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}\n\n    if (typeof source !== 'object') {\n      throw new TypeError(source + 'must be object');\n    }\n\n    Object.keys(source).forEach(function (key) {\n      obj[key] = source[key];\n    });\n  });\n\n  return obj;\n}\n\n// Remove element from array and put another array at those position.\n// Useful for some operations with tokens\nfunction arrayReplaceAt(src, pos, newElements) {\n  return [].concat(src.slice(0, pos), newElements, src.slice(pos + 1));\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\nfunction isValidEntityCode(c) {\n  /*eslint no-bitwise:0*/\n  // broken sequence\n  if (c >= 0xD800 && c <= 0xDFFF) { return false; }\n  // never used\n  if (c >= 0xFDD0 && c <= 0xFDEF) { return false; }\n  if ((c & 0xFFFF) === 0xFFFF || (c & 0xFFFF) === 0xFFFE) { return false; }\n  // control codes\n  if (c >= 0x00 && c <= 0x08) { return false; }\n  if (c === 0x0B) { return false; }\n  if (c >= 0x0E && c <= 0x1F) { return false; }\n  if (c >= 0x7F && c <= 0x9F) { return false; }\n  // out of range\n  if (c > 0x10FFFF) { return false; }\n  return true;\n}\n\nfunction fromCodePoint(c) {\n  /*eslint no-bitwise:0*/\n  if (c > 0xffff) {\n    c -= 0x10000;\n    var surrogate1 = 0xd800 + (c >> 10),\n        surrogate2 = 0xdc00 + (c & 0x3ff);\n\n    return String.fromCharCode(surrogate1, surrogate2);\n  }\n  return String.fromCharCode(c);\n}\n\n\nvar UNESCAPE_MD_RE  = /\\\\([!\"#$%&'()*+,\\-.\\/:;<=>?@[\\\\\\]^_`{|}~])/g;\nvar ENTITY_RE       = /&([a-z#][a-z0-9]{1,31});/gi;\nvar UNESCAPE_ALL_RE = new RegExp(UNESCAPE_MD_RE.source + '|' + ENTITY_RE.source, 'gi');\n\nvar DIGITAL_ENTITY_TEST_RE = /^#((?:x[a-f0-9]{1,8}|[0-9]{1,8}))/i;\n\nvar entities = require('./entities');\n\nfunction replaceEntityPattern(match, name) {\n  var code = 0;\n\n  if (has(entities, name)) {\n    return entities[name];\n  }\n\n  if (name.charCodeAt(0) === 0x23/* # */ && DIGITAL_ENTITY_TEST_RE.test(name)) {\n    code = name[1].toLowerCase() === 'x' ?\n      parseInt(name.slice(2), 16)\n    :\n      parseInt(name.slice(1), 10);\n    if (isValidEntityCode(code)) {\n      return fromCodePoint(code);\n    }\n  }\n\n  return match;\n}\n\n/*function replaceEntities(str) {\n  if (str.indexOf('&') < 0) { return str; }\n\n  return str.replace(ENTITY_RE, replaceEntityPattern);\n}*/\n\nfunction unescapeMd(str) {\n  if (str.indexOf('\\\\') < 0) { return str; }\n  return str.replace(UNESCAPE_MD_RE, '$1');\n}\n\nfunction unescapeAll(str) {\n  if (str.indexOf('\\\\') < 0 && str.indexOf('&') < 0) { return str; }\n\n  return str.replace(UNESCAPE_ALL_RE, function (match, escaped, entity) {\n    if (escaped) { return escaped; }\n    return replaceEntityPattern(match, entity);\n  });\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\nvar HTML_ESCAPE_TEST_RE = /[&<>\"]/;\nvar HTML_ESCAPE_REPLACE_RE = /[&<>\"]/g;\nvar HTML_REPLACEMENTS = {\n  '&': '&amp;',\n  '<': '&lt;',\n  '>': '&gt;',\n  '\"': '&quot;'\n};\n\nfunction replaceUnsafeChar(ch) {\n  return HTML_REPLACEMENTS[ch];\n}\n\nfunction escapeHtml(str) {\n  if (HTML_ESCAPE_TEST_RE.test(str)) {\n    return str.replace(HTML_ESCAPE_REPLACE_RE, replaceUnsafeChar);\n  }\n  return str;\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\nvar REGEXP_ESCAPE_RE = /[.?*+^$[\\]\\\\(){}|-]/g;\n\nfunction escapeRE(str) {\n  return str.replace(REGEXP_ESCAPE_RE, '\\\\$&');\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\nfunction isSpace(code) {\n  switch (code) {\n    case 0x09:\n    case 0x20:\n      return true;\n  }\n  return false;\n}\n\n// Zs (unicode class) || [\\t\\f\\v\\r\\n]\nfunction isWhiteSpace(code) {\n  if (code >= 0x2000 && code <= 0x200A) { return true; }\n  switch (code) {\n    case 0x09: // \\t\n    case 0x0A: // \\n\n    case 0x0B: // \\v\n    case 0x0C: // \\f\n    case 0x0D: // \\r\n    case 0x20:\n    case 0xA0:\n    case 0x1680:\n    case 0x202F:\n    case 0x205F:\n    case 0x3000:\n      return true;\n  }\n  return false;\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\n/*eslint-disable max-len*/\nvar UNICODE_PUNCT_RE = require('uc.micro/categories/P/regex');\n\n// Currently without astral characters support.\nfunction isPunctChar(ch) {\n  return UNICODE_PUNCT_RE.test(ch);\n}\n\n\n// Markdown ASCII punctuation characters.\n//\n// !, \", #, $, %, &, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, @, [, \\, ], ^, _, `, {, |, }, or ~\n// http://spec.commonmark.org/0.15/#ascii-punctuation-character\n//\n// Don't confuse with unicode punctuation !!! It lacks some chars in ascii range.\n//\nfunction isMdAsciiPunct(ch) {\n  switch (ch) {\n    case 0x21/* ! */:\n    case 0x22/* \" */:\n    case 0x23/* # */:\n    case 0x24/* $ */:\n    case 0x25/* % */:\n    case 0x26/* & */:\n    case 0x27/* ' */:\n    case 0x28/* ( */:\n    case 0x29/* ) */:\n    case 0x2A/* * */:\n    case 0x2B/* + */:\n    case 0x2C/* , */:\n    case 0x2D/* - */:\n    case 0x2E/* . */:\n    case 0x2F/* / */:\n    case 0x3A/* : */:\n    case 0x3B/* ; */:\n    case 0x3C/* < */:\n    case 0x3D/* = */:\n    case 0x3E/* > */:\n    case 0x3F/* ? */:\n    case 0x40/* @ */:\n    case 0x5B/* [ */:\n    case 0x5C/* \\ */:\n    case 0x5D/* ] */:\n    case 0x5E/* ^ */:\n    case 0x5F/* _ */:\n    case 0x60/* ` */:\n    case 0x7B/* { */:\n    case 0x7C/* | */:\n    case 0x7D/* } */:\n    case 0x7E/* ~ */:\n      return true;\n    default:\n      return false;\n  }\n}\n\n// Hepler to unify [reference labels].\n//\nfunction normalizeReference(str) {\n  // use .toUpperCase() instead of .toLowerCase()\n  // here to avoid a conflict with Object.prototype\n  // members (most notably, `__proto__`)\n  return str.trim().replace(/\\s+/g, ' ').toUpperCase();\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\n// Re-export libraries commonly used in both markdown-it and its plugins,\n// so plugins won't have to depend on them explicitly, which reduces their\n// bundled size (e.g. a browser build).\n//\nexports.lib                 = {};\nexports.lib.mdurl           = require('mdurl');\nexports.lib.ucmicro         = require('uc.micro');\n\nexports.assign              = assign;\nexports.isString            = isString;\nexports.has                 = has;\nexports.unescapeMd          = unescapeMd;\nexports.unescapeAll         = unescapeAll;\nexports.isValidEntityCode   = isValidEntityCode;\nexports.fromCodePoint       = fromCodePoint;\n// exports.replaceEntities     = replaceEntities;\nexports.escapeHtml          = escapeHtml;\nexports.arrayReplaceAt      = arrayReplaceAt;\nexports.isSpace             = isSpace;\nexports.isWhiteSpace        = isWhiteSpace;\nexports.isMdAsciiPunct      = isMdAsciiPunct;\nexports.isPunctChar         = isPunctChar;\nexports.escapeRE            = escapeRE;\nexports.normalizeReference  = normalizeReference;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* global console */\n\n/**\n * @module utils/log\n */\n\nimport { attachLinkToDocumentation } from './ckeditorerror';\n\n/**\n * The logging module.\n *\n * This object features two functions that should be used across CKEditor code base to log errors and warnings.\n * Despite being an overridable interface for native `console.*` this module serves also the goal to limit the\n * code size of a minified CKEditor package. During minification process the messages will be shortened and\n * links to their documentation will be logged to the console.\n *\n * All errors and warning should be documented in the following way:\n *\n *\t\t/**\n *\t\t * Error thrown when a plugin cannot be loaded due to JavaScript errors, lack of plugins with a given name, etc.\n *\t\t *\n *\t\t * @error plugin-load\n *\t\t * @param pluginName The name of the plugin that could not be loaded.\n *\t\t * @param moduleName The name of the module which tried to load this plugin.\n *\t\t * /\n *\t\tlog.error( 'plugin-load: It was not possible to load the \"{$pluginName}\" plugin in module \"{$moduleName}', {\n *\t\t\tpluginName: 'foo',\n *\t\t\tmoduleName: 'bar'\n *\t\t} );\n *\n * ### Warning vs Error vs Throw\n *\n * * Whenever a potentially incorrect situation occurs, which does not directly lead to an incorrect behavior,\n * log a warning.\n * * Whenever an incorrect situation occurs, but the app may continue working (although perhaps incorrectly),\n * log an error.\n * * Whenever it's really bad and it does not make sense to continue working, throw a {@link module:utils/ckeditorerror~CKEditorError}.\n *\n * @namespace\n */\nconst log = {\n\t/**\n\t * Logs an error to the console.\n\t *\n\t * Read more about error logging in the {@link module:utils/log} module.\n\t *\n\t * @param {String} message The error message in an `error-name: Error message.` format.\n\t * During the minification process the \"Error message\" part will be removed to limit the code size\n\t * and a link to this error documentation will be logged to the console.\n\t * @param {Object} [data] Additional data describing the error.\n\t */\n\terror( message, data ) {\n\t\tconsole.error( attachLinkToDocumentation( message ), data );\n\t},\n\n\t/**\n\t * Logs a warning to the console.\n\t *\n\t * Read more about error logging in the {@link module:utils/log} module.\n\t *\n\t * @param {String} message The warning message in a `warning-name: Warning message.` format.\n\t * During the minification process the \"Warning message\" part will be removed to limit the code size\n\t * and a link to this error documentation will be logged to the console.\n\t * @param {Object} [data] Additional data describing the warning.\n\t */\n\twarn( message, data ) {\n\t\tconsole.warn( attachLinkToDocumentation( message ), data );\n\t}\n};\n\nexport default log;\n","import checkGlobal from './_checkGlobal';\n\n/** Used to determine if values are of the language type `Object`. */\nvar objectTypes = {\n  'function': true,\n  'object': true\n};\n\n/** Detect free variable `exports`. */\nvar freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)\n  ? exports\n  : undefined;\n\n/** Detect free variable `module`. */\nvar freeModule = (objectTypes[typeof module] && module && !module.nodeType)\n  ? module\n  : undefined;\n\n/** Detect free variable `global` from Node.js. */\nvar freeGlobal = checkGlobal(freeExports && freeModule && typeof global == 'object' && global);\n\n/** Detect free variable `self`. */\nvar freeSelf = checkGlobal(objectTypes[typeof self] && self);\n\n/** Detect free variable `window`. */\nvar freeWindow = checkGlobal(objectTypes[typeof window] && window);\n\n/** Detect `this` as the global object. */\nvar thisGlobal = checkGlobal(objectTypes[typeof this] && this);\n\n/**\n * Used as a reference to the global object.\n *\n * The `this` value is used if it's the global object to avoid Greasemonkey's\n * restricted `window` object, otherwise the `window` object is used.\n */\nvar root = freeGlobal ||\n  ((freeWindow !== (thisGlobal && thisGlobal.window)) && freeWindow) ||\n    freeSelf || thisGlobal || Function('return this')();\n\nexport default root;\n","/**\n * Checks if `value` is a global object.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {null|Object} Returns `value` if it's a global object, else `null`.\n */\nfunction checkGlobal(value) {\n  return (value && value.Object === Object) ? value : null;\n}\n\nexport default checkGlobal;\n","module.exports = \"<svg width=\\\"20\\\" height=\\\"20\\\" viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M6.972 16.615a.997.997 0 0 1-.744-.292l-4.596-4.596a1 1 0 1 1 1.414-1.414l3.926 3.926 9.937-9.937a1 1 0 0 1 1.414 1.415L7.717 16.323a.997.997 0 0 1-.745.292z\\\" fill=\\\"#000\\\" fill-rule=\\\"evenodd\\\"/></svg>\"","module.exports = \"<svg width=\\\"20\\\" height=\\\"20\\\" viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><path d=\\\"M11.591 10.177l4.243 4.242a1 1 0 0 1-1.415 1.415l-4.242-4.243-4.243 4.243a1 1 0 0 1-1.414-1.415l4.243-4.242L4.52 5.934A1 1 0 0 1 5.934 4.52l4.243 4.243 4.242-4.243a1 1 0 1 1 1.415 1.414l-4.243 4.243z\\\" fill=\\\"#000\\\" fill-rule=\\\"evenodd\\\"/></svg>\"","module.exports = \"<svg width=\\\"20\\\" height=\\\"20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><g fill=\\\"#000\\\" fill-rule=\\\"nonzero\\\"><path d=\\\"M2 4.5V3h16v1.5zM2 7.5V6h5.674v1.5zM2 10.5V9h5.674v1.5zM2 13.5V12h5.674v1.5zM10.5 7.5V12h6V7.5h-6zM9.682 6h7.636c.377 0 .682.407.682.91v5.68c0 .503-.305.91-.682.91H9.682c-.377 0-.682-.407-.682-.91V6.91c0-.503.305-.91.682-.91zM2 16.5V15h16v1.5z\\\"/></g></svg>\\n\"","var g;\n\n// This works in non-strict mode\ng = (function() {\n\treturn this;\n})();\n\ntry {\n\t// This works if eval is allowed (see CSP)\n\tg = g || Function(\"return this\")() || (1, eval)(\"this\");\n} catch (e) {\n\t// This works if the window reference is available\n\tif (typeof window === \"object\") g = window;\n}\n\n// g can still be undefined, but nothing to do about it...\n// We return undefined, instead of nothing here, so it's\n// easier to handle this case. if(!global) { ...}\n\nmodule.exports = g;\n","module.exports=/[!-#%-\\*,-/:;\\?@\\[-\\]_\\{\\}\\xA1\\xA7\\xAB\\xB6\\xB7\\xBB\\xBF\\u037E\\u0387\\u055A-\\u055F\\u0589\\u058A\\u05BE\\u05C0\\u05C3\\u05C6\\u05F3\\u05F4\\u0609\\u060A\\u060C\\u060D\\u061B\\u061E\\u061F\\u066A-\\u066D\\u06D4\\u0700-\\u070D\\u07F7-\\u07F9\\u0830-\\u083E\\u085E\\u0964\\u0965\\u0970\\u09FD\\u0AF0\\u0DF4\\u0E4F\\u0E5A\\u0E5B\\u0F04-\\u0F12\\u0F14\\u0F3A-\\u0F3D\\u0F85\\u0FD0-\\u0FD4\\u0FD9\\u0FDA\\u104A-\\u104F\\u10FB\\u1360-\\u1368\\u1400\\u166D\\u166E\\u169B\\u169C\\u16EB-\\u16ED\\u1735\\u1736\\u17D4-\\u17D6\\u17D8-\\u17DA\\u1800-\\u180A\\u1944\\u1945\\u1A1E\\u1A1F\\u1AA0-\\u1AA6\\u1AA8-\\u1AAD\\u1B5A-\\u1B60\\u1BFC-\\u1BFF\\u1C3B-\\u1C3F\\u1C7E\\u1C7F\\u1CC0-\\u1CC7\\u1CD3\\u2010-\\u2027\\u2030-\\u2043\\u2045-\\u2051\\u2053-\\u205E\\u207D\\u207E\\u208D\\u208E\\u2308-\\u230B\\u2329\\u232A\\u2768-\\u2775\\u27C5\\u27C6\\u27E6-\\u27EF\\u2983-\\u2998\\u29D8-\\u29DB\\u29FC\\u29FD\\u2CF9-\\u2CFC\\u2CFE\\u2CFF\\u2D70\\u2E00-\\u2E2E\\u2E30-\\u2E49\\u3001-\\u3003\\u3008-\\u3011\\u3014-\\u301F\\u3030\\u303D\\u30A0\\u30FB\\uA4FE\\uA4FF\\uA60D-\\uA60F\\uA673\\uA67E\\uA6F2-\\uA6F7\\uA874-\\uA877\\uA8CE\\uA8CF\\uA8F8-\\uA8FA\\uA8FC\\uA92E\\uA92F\\uA95F\\uA9C1-\\uA9CD\\uA9DE\\uA9DF\\uAA5C-\\uAA5F\\uAADE\\uAADF\\uAAF0\\uAAF1\\uABEB\\uFD3E\\uFD3F\\uFE10-\\uFE19\\uFE30-\\uFE52\\uFE54-\\uFE61\\uFE63\\uFE68\\uFE6A\\uFE6B\\uFF01-\\uFF03\\uFF05-\\uFF0A\\uFF0C-\\uFF0F\\uFF1A\\uFF1B\\uFF1F\\uFF20\\uFF3B-\\uFF3D\\uFF3F\\uFF5B\\uFF5D\\uFF5F-\\uFF65]|\\uD800[\\uDD00-\\uDD02\\uDF9F\\uDFD0]|\\uD801\\uDD6F|\\uD802[\\uDC57\\uDD1F\\uDD3F\\uDE50-\\uDE58\\uDE7F\\uDEF0-\\uDEF6\\uDF39-\\uDF3F\\uDF99-\\uDF9C]|\\uD804[\\uDC47-\\uDC4D\\uDCBB\\uDCBC\\uDCBE-\\uDCC1\\uDD40-\\uDD43\\uDD74\\uDD75\\uDDC5-\\uDDC9\\uDDCD\\uDDDB\\uDDDD-\\uDDDF\\uDE38-\\uDE3D\\uDEA9]|\\uD805[\\uDC4B-\\uDC4F\\uDC5B\\uDC5D\\uDCC6\\uDDC1-\\uDDD7\\uDE41-\\uDE43\\uDE60-\\uDE6C\\uDF3C-\\uDF3E]|\\uD806[\\uDE3F-\\uDE46\\uDE9A-\\uDE9C\\uDE9E-\\uDEA2]|\\uD807[\\uDC41-\\uDC45\\uDC70\\uDC71]|\\uD809[\\uDC70-\\uDC74]|\\uD81A[\\uDE6E\\uDE6F\\uDEF5\\uDF37-\\uDF3B\\uDF44]|\\uD82F\\uDC9F|\\uD836[\\uDE87-\\uDE8B]|\\uD83A[\\uDD5E\\uDD5F]/","/**\n * class Ruler\n *\n * Helper class, used by [[MarkdownIt#core]], [[MarkdownIt#block]] and\n * [[MarkdownIt#inline]] to manage sequences of functions (rules):\n *\n * - keep rules in defined order\n * - assign the name to each rule\n * - enable/disable rules\n * - add/replace rules\n * - allow assign rules to additional named chains (in the same)\n * - cacheing lists of active rules\n *\n * You will not need use this class directly until write plugins. For simple\n * rules control use [[MarkdownIt.disable]], [[MarkdownIt.enable]] and\n * [[MarkdownIt.use]].\n **/\n'use strict';\n\n\n/**\n * new Ruler()\n **/\nfunction Ruler() {\n  // List of added rules. Each element is:\n  //\n  // {\n  //   name: XXX,\n  //   enabled: Boolean,\n  //   fn: Function(),\n  //   alt: [ name2, name3 ]\n  // }\n  //\n  this.__rules__ = [];\n\n  // Cached rule chains.\n  //\n  // First level - chain name, '' for default.\n  // Second level - diginal anchor for fast filtering by charcodes.\n  //\n  this.__cache__ = null;\n}\n\n////////////////////////////////////////////////////////////////////////////////\n// Helper methods, should not be used directly\n\n\n// Find rule index by name\n//\nRuler.prototype.__find__ = function (name) {\n  for (var i = 0; i < this.__rules__.length; i++) {\n    if (this.__rules__[i].name === name) {\n      return i;\n    }\n  }\n  return -1;\n};\n\n\n// Build rules lookup cache\n//\nRuler.prototype.__compile__ = function () {\n  var self = this;\n  var chains = [ '' ];\n\n  // collect unique names\n  self.__rules__.forEach(function (rule) {\n    if (!rule.enabled) { return; }\n\n    rule.alt.forEach(function (altName) {\n      if (chains.indexOf(altName) < 0) {\n        chains.push(altName);\n      }\n    });\n  });\n\n  self.__cache__ = {};\n\n  chains.forEach(function (chain) {\n    self.__cache__[chain] = [];\n    self.__rules__.forEach(function (rule) {\n      if (!rule.enabled) { return; }\n\n      if (chain && rule.alt.indexOf(chain) < 0) { return; }\n\n      self.__cache__[chain].push(rule.fn);\n    });\n  });\n};\n\n\n/**\n * Ruler.at(name, fn [, options])\n * - name (String): rule name to replace.\n * - fn (Function): new rule function.\n * - options (Object): new rule options (not mandatory).\n *\n * Replace rule by name with new function & options. Throws error if name not\n * found.\n *\n * ##### Options:\n *\n * - __alt__ - array with names of \"alternate\" chains.\n *\n * ##### Example\n *\n * Replace existing typographer replacement rule with new one:\n *\n * ```javascript\n * var md = require('markdown-it')();\n *\n * md.core.ruler.at('replacements', function replace(state) {\n *   //...\n * });\n * ```\n **/\nRuler.prototype.at = function (name, fn, options) {\n  var index = this.__find__(name);\n  var opt = options || {};\n\n  if (index === -1) { throw new Error('Parser rule not found: ' + name); }\n\n  this.__rules__[index].fn = fn;\n  this.__rules__[index].alt = opt.alt || [];\n  this.__cache__ = null;\n};\n\n\n/**\n * Ruler.before(beforeName, ruleName, fn [, options])\n * - beforeName (String): new rule will be added before this one.\n * - ruleName (String): name of added rule.\n * - fn (Function): rule function.\n * - options (Object): rule options (not mandatory).\n *\n * Add new rule to chain before one with given name. See also\n * [[Ruler.after]], [[Ruler.push]].\n *\n * ##### Options:\n *\n * - __alt__ - array with names of \"alternate\" chains.\n *\n * ##### Example\n *\n * ```javascript\n * var md = require('markdown-it')();\n *\n * md.block.ruler.before('paragraph', 'my_rule', function replace(state) {\n *   //...\n * });\n * ```\n **/\nRuler.prototype.before = function (beforeName, ruleName, fn, options) {\n  var index = this.__find__(beforeName);\n  var opt = options || {};\n\n  if (index === -1) { throw new Error('Parser rule not found: ' + beforeName); }\n\n  this.__rules__.splice(index, 0, {\n    name: ruleName,\n    enabled: true,\n    fn: fn,\n    alt: opt.alt || []\n  });\n\n  this.__cache__ = null;\n};\n\n\n/**\n * Ruler.after(afterName, ruleName, fn [, options])\n * - afterName (String): new rule will be added after this one.\n * - ruleName (String): name of added rule.\n * - fn (Function): rule function.\n * - options (Object): rule options (not mandatory).\n *\n * Add new rule to chain after one with given name. See also\n * [[Ruler.before]], [[Ruler.push]].\n *\n * ##### Options:\n *\n * - __alt__ - array with names of \"alternate\" chains.\n *\n * ##### Example\n *\n * ```javascript\n * var md = require('markdown-it')();\n *\n * md.inline.ruler.after('text', 'my_rule', function replace(state) {\n *   //...\n * });\n * ```\n **/\nRuler.prototype.after = function (afterName, ruleName, fn, options) {\n  var index = this.__find__(afterName);\n  var opt = options || {};\n\n  if (index === -1) { throw new Error('Parser rule not found: ' + afterName); }\n\n  this.__rules__.splice(index + 1, 0, {\n    name: ruleName,\n    enabled: true,\n    fn: fn,\n    alt: opt.alt || []\n  });\n\n  this.__cache__ = null;\n};\n\n/**\n * Ruler.push(ruleName, fn [, options])\n * - ruleName (String): name of added rule.\n * - fn (Function): rule function.\n * - options (Object): rule options (not mandatory).\n *\n * Push new rule to the end of chain. See also\n * [[Ruler.before]], [[Ruler.after]].\n *\n * ##### Options:\n *\n * - __alt__ - array with names of \"alternate\" chains.\n *\n * ##### Example\n *\n * ```javascript\n * var md = require('markdown-it')();\n *\n * md.core.ruler.push('my_rule', function replace(state) {\n *   //...\n * });\n * ```\n **/\nRuler.prototype.push = function (ruleName, fn, options) {\n  var opt = options || {};\n\n  this.__rules__.push({\n    name: ruleName,\n    enabled: true,\n    fn: fn,\n    alt: opt.alt || []\n  });\n\n  this.__cache__ = null;\n};\n\n\n/**\n * Ruler.enable(list [, ignoreInvalid]) -> Array\n * - list (String|Array): list of rule names to enable.\n * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.\n *\n * Enable rules with given names. If any rule name not found - throw Error.\n * Errors can be disabled by second param.\n *\n * Returns list of found rule names (if no exception happened).\n *\n * See also [[Ruler.disable]], [[Ruler.enableOnly]].\n **/\nRuler.prototype.enable = function (list, ignoreInvalid) {\n  if (!Array.isArray(list)) { list = [ list ]; }\n\n  var result = [];\n\n  // Search by name and enable\n  list.forEach(function (name) {\n    var idx = this.__find__(name);\n\n    if (idx < 0) {\n      if (ignoreInvalid) { return; }\n      throw new Error('Rules manager: invalid rule name ' + name);\n    }\n    this.__rules__[idx].enabled = true;\n    result.push(name);\n  }, this);\n\n  this.__cache__ = null;\n  return result;\n};\n\n\n/**\n * Ruler.enableOnly(list [, ignoreInvalid])\n * - list (String|Array): list of rule names to enable (whitelist).\n * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.\n *\n * Enable rules with given names, and disable everything else. If any rule name\n * not found - throw Error. Errors can be disabled by second param.\n *\n * See also [[Ruler.disable]], [[Ruler.enable]].\n **/\nRuler.prototype.enableOnly = function (list, ignoreInvalid) {\n  if (!Array.isArray(list)) { list = [ list ]; }\n\n  this.__rules__.forEach(function (rule) { rule.enabled = false; });\n\n  this.enable(list, ignoreInvalid);\n};\n\n\n/**\n * Ruler.disable(list [, ignoreInvalid]) -> Array\n * - list (String|Array): list of rule names to disable.\n * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.\n *\n * Disable rules with given names. If any rule name not found - throw Error.\n * Errors can be disabled by second param.\n *\n * Returns list of found rule names (if no exception happened).\n *\n * See also [[Ruler.enable]], [[Ruler.enableOnly]].\n **/\nRuler.prototype.disable = function (list, ignoreInvalid) {\n  if (!Array.isArray(list)) { list = [ list ]; }\n\n  var result = [];\n\n  // Search by name and disable\n  list.forEach(function (name) {\n    var idx = this.__find__(name);\n\n    if (idx < 0) {\n      if (ignoreInvalid) { return; }\n      throw new Error('Rules manager: invalid rule name ' + name);\n    }\n    this.__rules__[idx].enabled = false;\n    result.push(name);\n  }, this);\n\n  this.__cache__ = null;\n  return result;\n};\n\n\n/**\n * Ruler.getRules(chainName) -> Array\n *\n * Return array of active functions (rules) for given chain name. It analyzes\n * rules configuration, compiles caches if not exists and returns result.\n *\n * Default chain name is `''` (empty string). It can't be skipped. That's\n * done intentionally, to keep signature monomorphic for high speed.\n **/\nRuler.prototype.getRules = function (chainName) {\n  if (this.__cache__ === null) {\n    this.__compile__();\n  }\n\n  // Chain can be empty, if rules disabled. But we still have to return Array.\n  return this.__cache__[chainName] || [];\n};\n\nmodule.exports = Ruler;\n","// Token class\n\n'use strict';\n\n\n/**\n * class Token\n **/\n\n/**\n * new Token(type, tag, nesting)\n *\n * Create new token and fill passed properties.\n **/\nfunction Token(type, tag, nesting) {\n  /**\n   * Token#type -> String\n   *\n   * Type of the token (string, e.g. \"paragraph_open\")\n   **/\n  this.type     = type;\n\n  /**\n   * Token#tag -> String\n   *\n   * html tag name, e.g. \"p\"\n   **/\n  this.tag      = tag;\n\n  /**\n   * Token#attrs -> Array\n   *\n   * Html attributes. Format: `[ [ name1, value1 ], [ name2, value2 ] ]`\n   **/\n  this.attrs    = null;\n\n  /**\n   * Token#map -> Array\n   *\n   * Source map info. Format: `[ line_begin, line_end ]`\n   **/\n  this.map      = null;\n\n  /**\n   * Token#nesting -> Number\n   *\n   * Level change (number in {-1, 0, 1} set), where:\n   *\n   * -  `1` means the tag is opening\n   * -  `0` means the tag is self-closing\n   * - `-1` means the tag is closing\n   **/\n  this.nesting  = nesting;\n\n  /**\n   * Token#level -> Number\n   *\n   * nesting level, the same as `state.level`\n   **/\n  this.level    = 0;\n\n  /**\n   * Token#children -> Array\n   *\n   * An array of child nodes (inline and img tokens)\n   **/\n  this.children = null;\n\n  /**\n   * Token#content -> String\n   *\n   * In a case of self-closing tag (code, html, fence, etc.),\n   * it has contents of this tag.\n   **/\n  this.content  = '';\n\n  /**\n   * Token#markup -> String\n   *\n   * '*' or '_' for emphasis, fence string for fence, etc.\n   **/\n  this.markup   = '';\n\n  /**\n   * Token#info -> String\n   *\n   * fence infostring\n   **/\n  this.info     = '';\n\n  /**\n   * Token#meta -> Object\n   *\n   * A place for plugins to store an arbitrary data\n   **/\n  this.meta     = null;\n\n  /**\n   * Token#block -> Boolean\n   *\n   * True for block-level tokens, false for inline tokens.\n   * Used in renderer to calculate line breaks\n   **/\n  this.block    = false;\n\n  /**\n   * Token#hidden -> Boolean\n   *\n   * If it's true, ignore this element when rendering. Used for tight lists\n   * to hide paragraphs.\n   **/\n  this.hidden   = false;\n}\n\n\n/**\n * Token.attrIndex(name) -> Number\n *\n * Search attribute index by name.\n **/\nToken.prototype.attrIndex = function attrIndex(name) {\n  var attrs, i, len;\n\n  if (!this.attrs) { return -1; }\n\n  attrs = this.attrs;\n\n  for (i = 0, len = attrs.length; i < len; i++) {\n    if (attrs[i][0] === name) { return i; }\n  }\n  return -1;\n};\n\n\n/**\n * Token.attrPush(attrData)\n *\n * Add `[ name, value ]` attribute to list. Init attrs if necessary\n **/\nToken.prototype.attrPush = function attrPush(attrData) {\n  if (this.attrs) {\n    this.attrs.push(attrData);\n  } else {\n    this.attrs = [ attrData ];\n  }\n};\n\n\n/**\n * Token.attrSet(name, value)\n *\n * Set `name` attribute to `value`. Override old value if exists.\n **/\nToken.prototype.attrSet = function attrSet(name, value) {\n  var idx = this.attrIndex(name),\n      attrData = [ name, value ];\n\n  if (idx < 0) {\n    this.attrPush(attrData);\n  } else {\n    this.attrs[idx] = attrData;\n  }\n};\n\n\n/**\n * Token.attrGet(name)\n *\n * Get the value of attribute `name`, or null if it does not exist.\n **/\nToken.prototype.attrGet = function attrGet(name) {\n  var idx = this.attrIndex(name), value = null;\n  if (idx >= 0) {\n    value = this.attrs[idx][1];\n  }\n  return value;\n};\n\n\n/**\n * Token.attrJoin(name, value)\n *\n * Join value to existing attribute via space. Or create new attribute if not\n * exists. Useful to operate with token classes.\n **/\nToken.prototype.attrJoin = function attrJoin(name, value) {\n  var idx = this.attrIndex(name);\n\n  if (idx < 0) {\n    this.attrPush([ name, value ]);\n  } else {\n    this.attrs[idx][1] = this.attrs[idx][1] + ' ' + value;\n  }\n};\n\n\nmodule.exports = Token;\n","module.exports = \"<svg width=\\\"20\\\" height=\\\"20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><g fill=\\\"#000\\\" fill-rule=\\\"nonzero\\\"><path d=\\\"M2 4.5V3h16v1.5zM4.5 7.5V12h11V7.5h-11zM4.061 6H15.94c.586 0 1.061.407 1.061.91v5.68c0 .503-.475.91-1.061.91H4.06C3.475 13.5 3 13.093 3 12.59V6.91C3 6.406 3.475 6 4.061 6zM2 16.5V15h16v1.5z\\\"/></g></svg>\\n\"","module.exports = \"<svg viewBox=\\\"0 0 20 20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\" fill-rule=\\\"evenodd\\\" clip-rule=\\\"evenodd\\\" stroke-linejoin=\\\"round\\\" stroke-miterlimit=\\\"1.414\\\"><path d=\\\"M18 4.5V3H2v1.5h16zm0 3V6h-5.674v1.5H18zm0 3V9h-5.674v1.5H18zm0 3V12h-5.674v1.5H18zm-8.5-6V12h-6V7.5h6zm.818-1.5H2.682C2.305 6 2 6.407 2 6.91v5.68c0 .503.305.91.682.91h7.636c.377 0 .682-.407.682-.91V6.91c0-.503-.305-.91-.682-.91zM18 16.5V15H2v1.5h16z\\\" fill-rule=\\\"nonzero\\\"/></svg>\"","module.exports = \"<svg width=\\\"20\\\" height=\\\"20\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><g fill=\\\"#000\\\" fill-rule=\\\"nonzero\\\"><path d=\\\"M2 4.5V3h16v1.5zM6.5 7.5V12h7V7.5h-7zM5.758 6h8.484c.419 0 .758.407.758.91v5.681c0 .502-.34.909-.758.909H5.758c-.419 0-.758-.407-.758-.91V6.91c0-.503.34-.91.758-.91zM2 16.5V15h16v1.5z\\\"/></g></svg>\\n\"","module.exports = function(originalModule) {\n\tif (!originalModule.webpackPolyfill) {\n\t\tvar module = Object.create(originalModule);\n\t\t// module.parent = undefined by default\n\t\tif (!module.children) module.children = [];\n\t\tObject.defineProperty(module, \"loaded\", {\n\t\t\tenumerable: true,\n\t\t\tget: function() {\n\t\t\t\treturn module.l;\n\t\t\t}\n\t\t});\n\t\tObject.defineProperty(module, \"id\", {\n\t\t\tenumerable: true,\n\t\t\tget: function() {\n\t\t\t\treturn module.i;\n\t\t\t}\n\t\t});\n\t\tObject.defineProperty(module, \"exports\", {\n\t\t\tenumerable: true\n\t\t});\n\t\tmodule.webpackPolyfill = 1;\n\t}\n\treturn module;\n};\n","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./code.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./code.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./code.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./heading.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./heading.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./heading.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","// HTML5 entities map: { name -> utf16string }\n//\n'use strict';\n\n/*eslint quotes:0*/\nmodule.exports = require('entities/maps/entities.json');\n","'use strict';\n\n\nmodule.exports.encode = require('./encode');\nmodule.exports.decode = require('./decode');\nmodule.exports.format = require('./format');\nmodule.exports.parse  = require('./parse');\n","module.exports=/[\\0-\\uD7FF\\uE000-\\uFFFF]|[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|[\\uD800-\\uDBFF](?![\\uDC00-\\uDFFF])|(?:[^\\uD800-\\uDBFF]|^)[\\uDC00-\\uDFFF]/","module.exports=/[\\0-\\x1F\\x7F-\\x9F]/","module.exports=/[ \\xA0\\u1680\\u2000-\\u200A\\u202F\\u205F\\u3000]/","// Regexps to match html elements\n\n'use strict';\n\nvar attr_name     = '[a-zA-Z_:][a-zA-Z0-9:._-]*';\n\nvar unquoted      = '[^\"\\'=<>`\\\\x00-\\\\x20]+';\nvar single_quoted = \"'[^']*'\";\nvar double_quoted = '\"[^\"]*\"';\n\nvar attr_value  = '(?:' + unquoted + '|' + single_quoted + '|' + double_quoted + ')';\n\nvar attribute   = '(?:\\\\s+' + attr_name + '(?:\\\\s*=\\\\s*' + attr_value + ')?)';\n\nvar open_tag    = '<[A-Za-z][A-Za-z0-9\\\\-]*' + attribute + '*\\\\s*\\\\/?>';\n\nvar close_tag   = '<\\\\/[A-Za-z][A-Za-z0-9\\\\-]*\\\\s*>';\nvar comment     = '<!---->|<!--(?:-?[^>-])(?:-?[^-])*-->';\nvar processing  = '<[?].*?[?]>';\nvar declaration = '<![A-Z]+\\\\s+[^>]*>';\nvar cdata       = '<!\\\\[CDATA\\\\[[\\\\s\\\\S]*?\\\\]\\\\]>';\n\nvar HTML_TAG_RE = new RegExp('^(?:' + open_tag + '|' + close_tag + '|' + comment +\n                        '|' + processing + '|' + declaration + '|' + cdata + ')');\nvar HTML_OPEN_CLOSE_TAG_RE = new RegExp('^(?:' + open_tag + '|' + close_tag + ')');\n\nmodule.exports.HTML_TAG_RE = HTML_TAG_RE;\nmodule.exports.HTML_OPEN_CLOSE_TAG_RE = HTML_OPEN_CLOSE_TAG_RE;\n","// ~~strike through~~\n//\n'use strict';\n\n\n// Insert each marker as a separate text token, and add it to delimiter list\n//\nmodule.exports.tokenize = function strikethrough(state, silent) {\n  var i, scanned, token, len, ch,\n      start = state.pos,\n      marker = state.src.charCodeAt(start);\n\n  if (silent) { return false; }\n\n  if (marker !== 0x7E/* ~ */) { return false; }\n\n  scanned = state.scanDelims(state.pos, true);\n  len = scanned.length;\n  ch = String.fromCharCode(marker);\n\n  if (len < 2) { return false; }\n\n  if (len % 2) {\n    token         = state.push('text', '', 0);\n    token.content = ch;\n    len--;\n  }\n\n  for (i = 0; i < len; i += 2) {\n    token         = state.push('text', '', 0);\n    token.content = ch + ch;\n\n    state.delimiters.push({\n      marker: marker,\n      jump:   i,\n      token:  state.tokens.length - 1,\n      level:  state.level,\n      end:    -1,\n      open:   scanned.can_open,\n      close:  scanned.can_close\n    });\n  }\n\n  state.pos += scanned.length;\n\n  return true;\n};\n\n\n// Walk through delimiter list and replace text tokens with tags\n//\nmodule.exports.postProcess = function strikethrough(state) {\n  var i, j,\n      startDelim,\n      endDelim,\n      token,\n      loneMarkers = [],\n      delimiters = state.delimiters,\n      max = state.delimiters.length;\n\n  for (i = 0; i < max; i++) {\n    startDelim = delimiters[i];\n\n    if (startDelim.marker !== 0x7E/* ~ */) {\n      continue;\n    }\n\n    if (startDelim.end === -1) {\n      continue;\n    }\n\n    endDelim = delimiters[startDelim.end];\n\n    token         = state.tokens[startDelim.token];\n    token.type    = 's_open';\n    token.tag     = 's';\n    token.nesting = 1;\n    token.markup  = '~~';\n    token.content = '';\n\n    token         = state.tokens[endDelim.token];\n    token.type    = 's_close';\n    token.tag     = 's';\n    token.nesting = -1;\n    token.markup  = '~~';\n    token.content = '';\n\n    if (state.tokens[endDelim.token - 1].type === 'text' &&\n        state.tokens[endDelim.token - 1].content === '~') {\n\n      loneMarkers.push(endDelim.token - 1);\n    }\n  }\n\n  // If a marker sequence has an odd number of characters, it's splitted\n  // like this: `~~~~~` -> `~` + `~~` + `~~`, leaving one marker at the\n  // start of the sequence.\n  //\n  // So, we have to move all those markers after subsequent s_close tags.\n  //\n  while (loneMarkers.length) {\n    i = loneMarkers.pop();\n    j = i + 1;\n\n    while (j < state.tokens.length && state.tokens[j].type === 's_close') {\n      j++;\n    }\n\n    j--;\n\n    if (i !== j) {\n      token = state.tokens[j];\n      state.tokens[j] = state.tokens[i];\n      state.tokens[i] = token;\n    }\n  }\n};\n","// Process *this* and _that_\n//\n'use strict';\n\n\n// Insert each marker as a separate text token, and add it to delimiter list\n//\nmodule.exports.tokenize = function emphasis(state, silent) {\n  var i, scanned, token,\n      start = state.pos,\n      marker = state.src.charCodeAt(start);\n\n  if (silent) { return false; }\n\n  if (marker !== 0x5F /* _ */ && marker !== 0x2A /* * */) { return false; }\n\n  scanned = state.scanDelims(state.pos, marker === 0x2A);\n\n  for (i = 0; i < scanned.length; i++) {\n    token         = state.push('text', '', 0);\n    token.content = String.fromCharCode(marker);\n\n    state.delimiters.push({\n      // Char code of the starting marker (number).\n      //\n      marker: marker,\n\n      // Total length of these series of delimiters.\n      //\n      length: scanned.length,\n\n      // An amount of characters before this one that's equivalent to\n      // current one. In plain English: if this delimiter does not open\n      // an emphasis, neither do previous `jump` characters.\n      //\n      // Used to skip sequences like \"*****\" in one step, for 1st asterisk\n      // value will be 0, for 2nd it's 1 and so on.\n      //\n      jump:   i,\n\n      // A position of the token this delimiter corresponds to.\n      //\n      token:  state.tokens.length - 1,\n\n      // Token level.\n      //\n      level:  state.level,\n\n      // If this delimiter is matched as a valid opener, `end` will be\n      // equal to its position, otherwise it's `-1`.\n      //\n      end:    -1,\n\n      // Boolean flags that determine if this delimiter could open or close\n      // an emphasis.\n      //\n      open:   scanned.can_open,\n      close:  scanned.can_close\n    });\n  }\n\n  state.pos += scanned.length;\n\n  return true;\n};\n\n\n// Walk through delimiter list and replace text tokens with tags\n//\nmodule.exports.postProcess = function emphasis(state) {\n  var i,\n      startDelim,\n      endDelim,\n      token,\n      ch,\n      isStrong,\n      delimiters = state.delimiters,\n      max = state.delimiters.length;\n\n  for (i = max - 1; i >= 0; i--) {\n    startDelim = delimiters[i];\n\n    if (startDelim.marker !== 0x5F/* _ */ && startDelim.marker !== 0x2A/* * */) {\n      continue;\n    }\n\n    // Process only opening markers\n    if (startDelim.end === -1) {\n      continue;\n    }\n\n    endDelim = delimiters[startDelim.end];\n\n    // If the previous delimiter has the same marker and is adjacent to this one,\n    // merge those into one strong delimiter.\n    //\n    // `<em><em>whatever</em></em>` -> `<strong>whatever</strong>`\n    //\n    isStrong = i > 0 &&\n               delimiters[i - 1].end === startDelim.end + 1 &&\n               delimiters[i - 1].token === startDelim.token - 1 &&\n               delimiters[startDelim.end + 1].token === endDelim.token + 1 &&\n               delimiters[i - 1].marker === startDelim.marker;\n\n    ch = String.fromCharCode(startDelim.marker);\n\n    token         = state.tokens[startDelim.token];\n    token.type    = isStrong ? 'strong_open' : 'em_open';\n    token.tag     = isStrong ? 'strong' : 'em';\n    token.nesting = 1;\n    token.markup  = isStrong ? ch + ch : ch;\n    token.content = '';\n\n    token         = state.tokens[endDelim.token];\n    token.type    = isStrong ? 'strong_close' : 'em_close';\n    token.tag     = isStrong ? 'strong' : 'em';\n    token.nesting = -1;\n    token.markup  = isStrong ? ch + ch : ch;\n    token.content = '';\n\n    if (isStrong) {\n      state.tokens[delimiters[i - 1].token].content = '';\n      state.tokens[delimiters[startDelim.end + 1].token].content = '';\n      i--;\n    }\n  }\n};\n","import constant from './constant';\nimport root from './_root';\n\n/** Used to determine if values are of the language type `Object`. */\nvar objectTypes = {\n  'function': true,\n  'object': true\n};\n\n/** Detect free variable `exports`. */\nvar freeExports = (objectTypes[typeof exports] && exports && !exports.nodeType)\n  ? exports\n  : undefined;\n\n/** Detect free variable `module`. */\nvar freeModule = (objectTypes[typeof module] && module && !module.nodeType)\n  ? module\n  : undefined;\n\n/** Detect the popular CommonJS extension `module.exports`. */\nvar moduleExports = (freeModule && freeModule.exports === freeExports)\n  ? freeExports\n  : undefined;\n\n/** Built-in value 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value;\n  };\n}\n\nexport default constant;\n","module.exports = \"<svg width=\\\"16\\\" height=\\\"16\\\" viewBox=\\\"0 0 16 16\\\" xmlns=\\\"http://www.w3.org/2000/svg\\\"><g><path d=\\\"M4 0v1H1v3H0V.5A.5.5 0 0 1 .5 0H4zm8 0h3.5a.5.5 0 0 1 .5.5V4h-1V1h-3V0zM4 16H.5a.5.5 0 0 1-.5-.5V12h1v3h3v1zm8 0v-1h3v-3h1v3.5a.5.5 0 0 1-.5.5H12z\\\"/><path fill-opacity=\\\".256\\\" d=\\\"M1 1h14v14H1z\\\"/><g class=\\\"ck-icon__selected-indicator\\\"><path d=\\\"M7 0h2v1H7V0zM0 7h1v2H0V7zm15 0h1v2h-1V7zm-8 8h2v1H7v-1z\\\"/><path fill-opacity=\\\".254\\\" d=\\\"M1 1h14v14H1z\\\"/></g></g></svg>\\n\"","module.exports = \"<svg xmlns=\\\"http://www.w3.org/2000/svg\\\" viewBox=\\\"0 0 20 20\\\"  width=\\\"20\\\" height=\\\"20\\\"><path d=\\\"M1.586 18.227l.398-2.753.398-2.753 2.355 2.388 2.355 2.355-2.753.365zM14.954 8.01l-7.099 7.065-.763-.796 7.065-7.066-1.592-1.559L5.5 12.721l-.763-.796 7.065-7.066-.796-.796-7.861 7.862 4.71 4.71 7.861-7.828zm3.25-1.56c.398-.397.398-1.094-.033-1.525L15.02 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@license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/version\n */\n\n/* globals window, global */\n\nimport log from './log';\nimport { version } from 'ckeditor5/package.json';\n\nconst windowOrGlobal = typeof window === 'object' ? window : global;\n\nif ( windowOrGlobal.CKEDITOR_VERSION ) {\n\t/**\n\t * This error is thrown when the `CKEDITOR_VERSION` global is being set more than once. This happens when in\n\t * two scenarios described above.\n\t *\n\t * # Some packages were duplicated\n\t *\n\t * CKEditor 5 was built from source packages which were duplicated during installation via npm.\n\t * Normally, npm deduplicates all packages so e.g. `@ckeditor/ckeditor5-core` is installed only once in `node_modules/`.\n\t * However, subsequent `npm install` calls or conflicting version dependencies may cause npm to install some packages\n\t * more than once. Furthermore, [npm in version 5+](https://github.com/npm/npm/issues/16991)\n\t * is also known for randomly failing to deduplicate packages.\n\t *\n\t * We recommend checking if any of the below steps helps:\n\t *\n\t * * `rm -rf node_modules && npm install` to make sure you have a clean `node_modules/` – this step\n\t * is known to help in majority of cases,\n\t * * check whether all CKEditor 5 packages are up to date and reinstall them\n\t * if you changed anything (`rm -rf node_modules && npm install`),\n\t * * downgrade npm to version 4 if you use a newer version.\n\t *\n\t * If all packages are correct and compatible with each other the above steps are known to help. If not, you may\n\t * try to check with `npm ls` how many times `@ckeditor/ckeditor5-core` is installed. If more than once, verify\n\t * which package causes that.\n\t *\n\t * # Two+ builds are loaded\n\t *\n\t * If you use CKEditor 5 builds, you might have loaded two (or more) `ckeditor.js` files in one web page\n\t * – check your web page for duplicated `<script>` elements or make sure your page builder/bundler includes CKEditor only once.\n\t *\n\t * @error ckeditor-version-collision\n\t * @param {String} collidingVersion The version of the build which has already been (incorrectly) loaded.\n\t * @param {String} version The version of the build which is supposed to be loaded.\n\t */\n\tlog.error( 'ckeditor-version-collision: The global CKEDITOR_VERSION constant has already been set.', {\n\t\tcollidingVersion: windowOrGlobal.CKEDITOR_VERSION,\n\t\tversion\n\t} );\n} else {\n\twindowOrGlobal.CKEDITOR_VERSION = version;\n}\n","\nvar content = require(\"!!../../../../postcss-loader/lib/index.js??ref--5-1!./globals.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../postcss-loader/lib/index.js??ref--5-1!./globals.css\", function() {\n\t\tvar newContent = require(\"!!../../../../postcss-loader/lib/index.js??ref--5-1!./globals.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-hidden{display:none!important}.ck.ck-reset,.ck.ck-reset_all,.ck.ck-reset_all *{box-sizing:border-box;width:auto;height:auto;position:static}:root{--ck-z-default:1;--ck-z-modal:calc(var(--ck-z-default) + 999);--ck-color-base-foreground:#fafafa;--ck-color-base-background:#fff;--ck-color-base-border:#c4c4c4;--ck-color-base-action:#61b045;--ck-color-base-focus:#6cb5f9;--ck-color-base-text:#333;--ck-color-base-active:#198cf0;--ck-color-base-active-focus:#0e7fe1;--ck-color-focus-border:#47a4f5;--ck-color-focus-shadow:rgba(119,186,248,.5);--ck-color-focus-disabled-shadow:rgba(119,186,248,.3);--ck-color-text:var(--ck-color-base-text);--ck-color-shadow-drop:rgba(0,0,0,.15);--ck-color-shadow-inner:rgba(0,0,0,.1);--ck-color-button-default-background:transparent;--ck-color-button-default-hover-background:#e6e6e6;--ck-color-button-default-active-background:#d9d9d9;--ck-color-button-default-active-shadow:#bfbfbf;--ck-color-button-default-disabled-background:transparent;--ck-color-button-on-background:#dedede;--ck-color-button-on-hover-background:#c4c4c4;--ck-color-button-on-active-background:#bababa;--ck-color-button-on-active-shadow:#a1a1a1;--ck-color-button-on-disabled-background:#dedede;--ck-color-button-action-background:var(--ck-color-base-action);--ck-color-button-action-hover-background:#579e3d;--ck-color-button-action-active-background:#53973b;--ck-color-button-action-active-shadow:#498433;--ck-color-button-action-disabled-background:#7ec365;--ck-color-button-action-text:var(--ck-color-base-background);--ck-color-button-save:#008a00;--ck-color-button-cancel:#db3700;--ck-color-switch-button-off-background:#b0b0b0;--ck-color-switch-button-on-background:var(--ck-color-button-action-background);--ck-color-switch-button-inner-background:var(--ck-color-base-background);--ck-color-dropdown-panel-background:var(--ck-color-base-background);--ck-color-dropdown-panel-border:var(--ck-color-base-border);--ck-color-input-background:var(--ck-color-base-background);--ck-color-input-border:#c7c7c7;--ck-color-input-text:var(--ck-color-base-text);--ck-color-input-disabled-background:#f2f2f2;--ck-color-input-disabled-border:#c7c7c7;--ck-color-input-disabled-text:#5c5c5c;--ck-color-list-background:var(--ck-color-base-background);--ck-color-list-button-hover-background:var(--ck-color-base-foreground);--ck-color-list-button-on-background:var(--ck-color-base-active);--ck-color-list-button-on-background-focus:var(--ck-color-base-active-focus);--ck-color-list-button-on-text:var(--ck-color-base-background);--ck-color-panel-background:var(--ck-color-base-background);--ck-color-panel-border:var(--ck-color-base-border);--ck-color-toolbar-background:var(--ck-color-base-foreground);--ck-color-toolbar-border:var(--ck-color-base-border);--ck-color-tooltip-background:var(--ck-color-base-text);--ck-color-tooltip-text:var(--ck-color-base-background);--ck-color-engine-placeholder-text:#c2c2c2;--ck-color-upload-bar-background:#6cb5f9;--ck-color-upload-infinite-background:rgba(0,0,0,.1);--ck-color-link-default:#0000f0;--ck-color-link-selected-background:#ebf8ff;--ck-disabled-opacity:.5;--ck-focus-outer-shadow-geometry:0 0 0 3px;--ck-focus-outer-shadow:var(--ck-focus-outer-shadow-geometry) var(--ck-color-focus-shadow);--ck-focus-disabled-outer-shadow:var(--ck-focus-outer-shadow-geometry) var(--ck-color-focus-disabled-shadow);--ck-focus-ring:1px solid var(--ck-color-focus-border);--ck-font-size-base:13px;--ck-line-height-base:1.84615;--ck-font-face:Helvetica,Arial,Tahoma,Verdana,Sans-Serif;--ck-font-size-tiny:0.7em;--ck-font-size-small:0.75em;--ck-font-size-normal:1em;--ck-font-size-big:1.4em;--ck-font-size-large:1.8em;--ck-ui-component-min-height:2.3em}.ck.ck-reset,.ck.ck-reset_all,.ck.ck-reset_all *{margin:0;padding:0;border:0;background:transparent;text-decoration:none;vertical-align:middle;transition:none;word-wrap:break-word}.ck.ck-reset_all,.ck.ck-reset_all *{border-collapse:collapse;font:normal normal normal var(--ck-font-size-base)/var(--ck-line-height-base) var(--ck-font-face);color:var(--ck-color-text);text-align:left;white-space:nowrap;cursor:auto;float:none}.ck.ck-reset_all .ck-rtl *{text-align:right}.ck.ck-reset_all iframe{vertical-align:inherit}.ck.ck-reset_all textarea{white-space:pre-wrap}.ck.ck-reset_all input[type=password],.ck.ck-reset_all input[type=text],.ck.ck-reset_all textarea{cursor:text}.ck.ck-reset_all input[type=password][disabled],.ck.ck-reset_all input[type=text][disabled],.ck.ck-reset_all textarea[disabled]{cursor:default}.ck.ck-reset_all fieldset{padding:10px;border:2px groove #dfdee3}.ck.ck-reset_all button::-moz-focus-inner{padding:0;border:0}:root{--ck-border-radius:2px;--ck-inner-shadow:2px 2px 3px var(--ck-color-shadow-inner) inset;--ck-drop-shadow:0 1px 2px 1px var(--ck-color-shadow-drop);--ck-spacing-unit:0.6em;--ck-spacing-large:calc(var(--ck-spacing-unit) * 1.5);--ck-spacing-standard:var(--ck-spacing-unit);--ck-spacing-medium:calc(var(--ck-spacing-unit) * 0.8);--ck-spacing-small:calc(var(--ck-spacing-unit) * 0.5);--ck-spacing-tiny:calc(var(--ck-spacing-unit) * 0.3);--ck-spacing-extra-tiny:calc(var(--ck-spacing-unit) * 0.16)}\"","\n/**\n * When source maps are enabled, `style-loader` uses a link element with a data-uri to\n * embed the css on the page. This breaks all relative urls because now they are relative to a\n * bundle instead of the current page.\n *\n * One solution is to only use full urls, but that may be impossible.\n *\n * Instead, this function \"fixes\" the relative urls to be absolute according to the current page location.\n *\n * A rudimentary test suite is located at `test/fixUrls.js` and can be run via the `npm test` command.\n *\n */\n\nmodule.exports = function (css) {\n  // get current location\n  var location = typeof window !== \"undefined\" && window.location;\n\n  if (!location) {\n    throw new Error(\"fixUrls requires window.location\");\n  }\n\n\t// blank or null?\n\tif (!css || typeof css !== \"string\") {\n\t  return css;\n  }\n\n  var baseUrl = location.protocol + \"//\" + location.host;\n  var currentDir = baseUrl + location.pathname.replace(/\\/[^\\/]*$/, \"/\");\n\n\t// convert each url(...)\n\t/*\n\tThis regular expression is just a way to recursively match brackets within\n\ta string.\n\n\t /url\\s*\\(  = Match on the word \"url\" with any whitespace after it and then a parens\n\t   (  = Start a capturing group\n\t     (?:  = Start a non-capturing group\n\t         [^)(]  = Match anything that isn't a parentheses\n\t         |  = OR\n\t         \\(  = Match a start parentheses\n\t             (?:  = Start another non-capturing groups\n\t                 [^)(]+  = Match anything that isn't a parentheses\n\t                 |  = OR\n\t                 \\(  = Match a start parentheses\n\t                     [^)(]*  = Match anything that isn't a parentheses\n\t                 \\)  = Match a end parentheses\n\t             )  = End Group\n              *\\) = Match anything and then a close parens\n          )  = Close non-capturing group\n          *  = Match anything\n       )  = Close capturing group\n\t \\)  = Match a close parens\n\n\t /gi  = Get all matches, not the first.  Be case insensitive.\n\t */\n\tvar fixedCss = css.replace(/url\\s*\\(((?:[^)(]|\\((?:[^)(]+|\\([^)(]*\\))*\\))*)\\)/gi, function(fullMatch, origUrl) {\n\t\t// strip quotes (if they exist)\n\t\tvar unquotedOrigUrl = origUrl\n\t\t\t.trim()\n\t\t\t.replace(/^\"(.*)\"$/, function(o, $1){ return $1; })\n\t\t\t.replace(/^'(.*)'$/, function(o, $1){ return $1; });\n\n\t\t// already a full url? no change\n\t\tif (/^(#|data:|http:\\/\\/|https:\\/\\/|file:\\/\\/\\/|\\s*$)/i.test(unquotedOrigUrl)) {\n\t\t  return fullMatch;\n\t\t}\n\n\t\t// convert the url to a full url\n\t\tvar newUrl;\n\n\t\tif (unquotedOrigUrl.indexOf(\"//\") === 0) {\n\t\t  \t//TODO: should we add protocol?\n\t\t\tnewUrl = unquotedOrigUrl;\n\t\t} else if (unquotedOrigUrl.indexOf(\"/\") === 0) {\n\t\t\t// path should be relative to the base url\n\t\t\tnewUrl = baseUrl + unquotedOrigUrl; // already starts with '/'\n\t\t} else {\n\t\t\t// path should be relative to current directory\n\t\t\tnewUrl = currentDir + unquotedOrigUrl.replace(/^\\.\\//, \"\"); // Strip leading './'\n\t\t}\n\n\t\t// send back the fixed url(...)\n\t\treturn \"url(\" + JSON.stringify(newUrl) + \")\";\n\t});\n\n\t// send back the fixed css\n\treturn fixedCss;\n};\n","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./editorui.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./editorui.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./editorui.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-editor__editable:not(.ck-editor__nested-editable){border-radius:0}.ck-rounded-corners .ck.ck-editor__editable:not(.ck-editor__nested-editable),.ck.ck-editor__editable:not(.ck-editor__nested-editable).ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-editor__editable:not(.ck-editor__nested-editable).ck-focused{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-inner-shadow),0 0}.ck.ck-editor__editable_inline{overflow:auto;padding:0 var(--ck-spacing-standard);border:1px solid transparent}.ck.ck-editor__editable_inline>:first-child{margin-top:var(--ck-spacing-large)}.ck.ck-editor__editable_inline>:last-child{margin-bottom:var(--ck-spacing-large)}.ck.ck-balloon-panel.ck-toolbar-container[class*=arrow_n]:after{border-bottom-color:var(--ck-color-base-foreground)}.ck.ck-balloon-panel.ck-toolbar-container[class*=arrow_s]:after{border-top-color:var(--ck-color-base-foreground)}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./label.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./label.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./label.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-label{display:block}.ck.ck-voice-label{display:none}.ck.ck-label{font-weight:700}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./stickypanel.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./stickypanel.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./stickypanel.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-sticky-panel .ck-sticky-panel__content_sticky{z-index:var(--ck-z-modal);position:fixed;top:0}.ck.ck-sticky-panel .ck-sticky-panel__content_sticky_bottom-limit{top:auto;position:absolute}.ck.ck-sticky-panel .ck-sticky-panel__content_sticky{box-shadow:var(--ck-drop-shadow),0 0;border-width:0 1px 1px;border-top-left-radius:0;border-top-right-radius:0}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbar.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbar.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbar.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-toolbar{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none;display:flex;flex-flow:row wrap;align-items:center}.ck.ck-toolbar.ck-toolbar_vertical{flex-direction:column}.ck.ck-toolbar.ck-toolbar_floating{flex-wrap:nowrap}.ck.ck-toolbar__separator{display:inline-block}.ck.ck-toolbar__newline{display:block;width:100%}.ck.ck-toolbar{border-radius:0}.ck-rounded-corners .ck.ck-toolbar,.ck.ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-toolbar{background:var(--ck-color-toolbar-background);padding:0 var(--ck-spacing-small);border:1px solid var(--ck-color-toolbar-border)}.ck.ck-toolbar>*{margin-right:var(--ck-spacing-small);margin-top:var(--ck-spacing-small);margin-bottom:var(--ck-spacing-small)}.ck.ck-toolbar.ck-toolbar_vertical{padding:0}.ck.ck-toolbar.ck-toolbar_vertical>*{width:100%;margin:0;border-radius:0;border:0}.ck.ck-toolbar>:last-child{margin-right:0}.ck-toolbar-container .ck.ck-toolbar{border:0}.ck.ck-toolbar__separator{align-self:stretch;width:1px;margin-top:0;margin-bottom:0;background:var(--ck-color-toolbar-border)}.ck.ck-toolbar__newline{margin:0}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./classiceditor.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./classiceditor.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./classiceditor.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-editor{position:relative}.ck.ck-editor .ck-editor__top .ck-sticky-panel .ck-toolbar{z-index:var(--ck-z-modal)}.ck.ck-editor__top .ck-sticky-panel .ck-toolbar{border-radius:0}.ck-rounded-corners .ck.ck-editor__top .ck-sticky-panel .ck-toolbar,.ck.ck-editor__top .ck-sticky-panel .ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius);border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-editor__top .ck-sticky-panel .ck-toolbar{border-bottom-width:0}.ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar{border-bottom-width:1px;border-radius:0}.ck-rounded-corners .ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar,.ck.ck-editor__top .ck-sticky-panel .ck-sticky-panel__content_sticky .ck-toolbar.ck-rounded-corners{border-radius:var(--ck-border-radius);border-radius:0}.ck.ck-editor__main>.ck-editor__editable{background:var(--ck-color-base-background);border-radius:0}.ck-rounded-corners .ck.ck-editor__main>.ck-editor__editable,.ck.ck-editor__main>.ck-editor__editable.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-top-right-radius:0}.ck.ck-editor__main>.ck-editor__editable:not(.ck-focused){border-color:var(--ck-color-base-border)}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./icon.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./icon.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./icon.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-icon{vertical-align:middle}:root{--ck-icon-size:calc(var(--ck-line-height-base) * var(--ck-font-size-normal))}.ck.ck-icon{width:var(--ck-icon-size);height:var(--ck-icon-size);font-size:.8333350694em;will-change:transform}.ck.ck-icon,.ck.ck-icon *{color:inherit;cursor:inherit}.ck.ck-icon *{fill:currentColor}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./tooltip.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./tooltip.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./tooltip.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-tooltip,.ck.ck-tooltip .ck-tooltip__text:after{position:absolute;pointer-events:none;-webkit-backface-visibility:hidden}.ck-tooltip{visibility:hidden;opacity:0;display:none;z-index:var(--ck-z-modal)}.ck-tooltip .ck-tooltip__text{display:inline-block}.ck-tooltip .ck-tooltip__text:after{content:\\\"\\\";width:0;height:0}:root{--ck-tooltip-arrow-size:5px}.ck.ck-tooltip{left:50%}.ck.ck-tooltip.ck-tooltip_s{bottom:calc(-1 * var(--ck-tooltip-arrow-size));transform:translateY(100%)}.ck.ck-tooltip.ck-tooltip_s .ck-tooltip__text:after{top:calc(-1 * var(--ck-tooltip-arrow-size));transform:translateX(-50%);border-color:transparent transparent var(--ck-color-tooltip-background);border-width:0 var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size)}.ck.ck-tooltip.ck-tooltip_n{top:calc(-1 * var(--ck-tooltip-arrow-size));transform:translateY(-100%)}.ck.ck-tooltip.ck-tooltip_n .ck-tooltip__text:after{bottom:calc(-1 * var(--ck-tooltip-arrow-size));transform:translateX(-50%);border-color:var(--ck-color-tooltip-background) transparent transparent;border-width:var(--ck-tooltip-arrow-size) var(--ck-tooltip-arrow-size) 0}.ck.ck-tooltip .ck-tooltip__text{border-radius:0}.ck-rounded-corners .ck.ck-tooltip .ck-tooltip__text,.ck.ck-tooltip .ck-tooltip__text.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-tooltip .ck-tooltip__text{font-size:.9em;line-height:1.5;color:var(--ck-color-tooltip-text);padding:var(--ck-spacing-small) var(--ck-spacing-medium);background:var(--ck-color-tooltip-background);position:relative;left:-50%}.ck.ck-tooltip .ck-tooltip__text:after{border-style:solid;left:50%}.ck.ck-tooltip,.ck.ck-tooltip .ck-tooltip__text:after{transition:opacity .2s ease-in-out .2s}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./button.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./button.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./button.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-button,a.ck.ck-button{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none}.ck.ck-button .ck-tooltip,a.ck.ck-button .ck-tooltip{display:block}@media (hover:none){.ck.ck-button .ck-tooltip,a.ck.ck-button .ck-tooltip{display:none}}.ck.ck-button,a.ck.ck-button{position:relative;display:inline-flex;align-items:center;justify-content:left}.ck.ck-button.ck-button_with-text .ck-button__label,a.ck.ck-button.ck-button_with-text .ck-button__label{display:inline-block}.ck.ck-button:not(.ck-button_with-text),a.ck.ck-button:not(.ck-button_with-text){justify-content:center}.ck.ck-button:hover .ck-tooltip,a.ck.ck-button:hover .ck-tooltip{visibility:visible;opacity:1}.ck.ck-button .ck-button__label,.ck.ck-button:focus:not(:hover) .ck-tooltip,a.ck.ck-button .ck-button__label,a.ck.ck-button:focus:not(:hover) .ck-tooltip{display:none}.ck.ck-button,a.ck.ck-button{background:var(--ck-color-button-default-background)}.ck.ck-button:not(.ck-disabled):hover,a.ck.ck-button:not(.ck-disabled):hover{background:var(--ck-color-button-default-hover-background)}.ck.ck-button:not(.ck-disabled):active,a.ck.ck-button:not(.ck-disabled):active{background:var(--ck-color-button-default-active-background);box-shadow:inset 0 2px 2px var(--ck-color-button-default-active-shadow)}.ck.ck-button.ck-disabled,a.ck.ck-button.ck-disabled{background:var(--ck-color-button-default-disabled-background)}.ck.ck-button,a.ck.ck-button{border-radius:0}.ck-rounded-corners .ck.ck-button,.ck-rounded-corners a.ck.ck-button,.ck.ck-button.ck-rounded-corners,a.ck.ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-button,a.ck.ck-button{white-space:nowrap;cursor:default;vertical-align:middle;padding:var(--ck-spacing-tiny);text-align:center;min-width:var(--ck-ui-component-min-height);min-height:var(--ck-ui-component-min-height);line-height:1;font-size:inherit;border:1px solid transparent;transition:box-shadow .2s ease-in-out}.ck.ck-button:active,.ck.ck-button:focus,a.ck.ck-button:active,a.ck.ck-button:focus{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-focus-outer-shadow),0 0;border-color:transparent}.ck.ck-button.ck-disabled:active,.ck.ck-button.ck-disabled:focus,a.ck.ck-button.ck-disabled:active,a.ck.ck-button.ck-disabled:focus{box-shadow:var(--ck-focus-disabled-outer-shadow),0 0}.ck.ck-button.ck-disabled .ck-button__icon,a.ck.ck-button.ck-disabled .ck-button__icon{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-disabled .ck-button__label,a.ck.ck-button.ck-disabled .ck-button__label{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-button_with-text,a.ck.ck-button.ck-button_with-text{padding:var(--ck-spacing-tiny) var(--ck-spacing-standard)}.ck.ck-button.ck-button_with-text .ck-button__icon,a.ck.ck-button.ck-button_with-text .ck-button__icon{margin-left:calc(-1 * var(--ck-spacing-small));margin-right:var(--ck-spacing-small)}.ck.ck-button.ck-on,a.ck.ck-button.ck-on{background:var(--ck-color-button-on-background)}.ck.ck-button.ck-on:not(.ck-disabled):hover,a.ck.ck-button.ck-on:not(.ck-disabled):hover{background:var(--ck-color-button-on-hover-background)}.ck.ck-button.ck-on:not(.ck-disabled):active,a.ck.ck-button.ck-on:not(.ck-disabled):active{background:var(--ck-color-button-on-active-background);box-shadow:inset 0 2px 2px var(--ck-color-button-on-active-shadow)}.ck.ck-button.ck-on.ck-disabled,a.ck.ck-button.ck-on.ck-disabled{background:var(--ck-color-button-on-disabled-background)}.ck.ck-button.ck-button-save,a.ck.ck-button.ck-button-save{color:var(--ck-color-button-save)}.ck.ck-button.ck-button-cancel,a.ck.ck-button.ck-button-cancel{color:var(--ck-color-button-cancel)}.ck.ck-button .ck-button__icon use,.ck.ck-button .ck-button__icon use *,a.ck.ck-button .ck-button__icon use,a.ck.ck-button .ck-button__icon use *{color:inherit}.ck.ck-button .ck-button__label,a.ck.ck-button .ck-button__label{font-size:inherit;font-weight:inherit;color:inherit;cursor:inherit;vertical-align:middle}.ck.ck-button-action,a.ck.ck-button-action{background:var(--ck-color-button-action-background)}.ck.ck-button-action:not(.ck-disabled):hover,a.ck.ck-button-action:not(.ck-disabled):hover{background:var(--ck-color-button-action-hover-background)}.ck.ck-button-action:not(.ck-disabled):active,a.ck.ck-button-action:not(.ck-disabled):active{background:var(--ck-color-button-action-active-background);box-shadow:inset 0 2px 2px var(--ck-color-button-action-active-shadow)}.ck.ck-button-action.ck-disabled,a.ck.ck-button-action.ck-disabled{background:var(--ck-color-button-action-disabled-background)}.ck.ck-button-action,a.ck.ck-button-action{color:var(--ck-color-button-action-text)}.ck.ck-button-bold,a.ck.ck-button-bold{font-weight:700}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./widget.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./widget.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./widget.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck .ck-widget.ck-widget_selectable{position:relative}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler{visibility:hidden;position:absolute}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler .ck-icon{display:block}.ck .ck-widget.ck-widget_selectable.ck-widget_selected .ck-widget__selection-handler,.ck .ck-widget.ck-widget_selectable:hover .ck-widget__selection-handler{visibility:visible}:root{--ck-widget-outline-thickness:3px;--ck-widget-handler-icon-size:16px;--ck-widget-handler-animation-duration:200ms;--ck-widget-handler-animation-curve:ease;--ck-color-widget-blurred-border:#dedede;--ck-color-widget-hover-border:#ffc83d;--ck-color-widget-editable-focus-background:var(--ck-color-base-background);--ck-color-widget-drag-handler-icon-color:var(--ck-color-base-background)}.ck .ck-widget{margin:var(--ck-spacing-standard) 0;padding:0;outline-width:var(--ck-widget-outline-thickness);outline-style:solid;outline-color:transparent;transition:outline-color var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve)}.ck .ck-widget.ck-widget_selected,.ck .ck-widget.ck-widget_selected:hover{outline:var(--ck-widget-outline-thickness) solid var(--ck-color-focus-border)}.ck .ck-widget:hover{outline-color:var(--ck-color-widget-hover-border)}.ck .ck-editor__nested-editable{border:1px solid transparent}.ck .ck-editor__nested-editable.ck-editor__nested-editable_focused,.ck .ck-editor__nested-editable:focus{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-inner-shadow),0 0;background-color:var(--ck-color-widget-editable-focus-background)}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler{padding:4px;box-sizing:border-box;background-color:transparent;opacity:0;transition:background-color var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve),visibility var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve),opacity var(--ck-widget-handler-animation-duration) var(--ck-widget-handler-animation-curve);border-radius:var(--ck-border-radius) var(--ck-border-radius) 0 0;transform:translateY(-100%);left:calc(0px - var(--ck-widget-outline-thickness))}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler:hover .ck-icon .ck-icon__selected-indicator{opacity:1}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler .ck-icon{width:var(--ck-widget-handler-icon-size);height:var(--ck-widget-handler-icon-size);color:var(--ck-color-widget-drag-handler-icon-color)}.ck .ck-widget.ck-widget_selectable .ck-widget__selection-handler .ck-icon .ck-icon__selected-indicator{opacity:0;transition:opacity .3s var(--ck-widget-handler-animation-curve)}.ck .ck-widget.ck-widget_selectable.ck-widget_selected .ck-widget__selection-handler,.ck .ck-widget.ck-widget_selectable.ck-widget_selected:hover .ck-widget__selection-handler{opacity:1;background-color:var(--ck-color-focus-border)}.ck .ck-widget.ck-widget_selectable.ck-widget_selected .ck-widget__selection-handler .ck-icon .ck-icon__selected-indicator,.ck .ck-widget.ck-widget_selectable.ck-widget_selected:hover .ck-widget__selection-handler .ck-icon .ck-icon__selected-indicator{opacity:1}.ck .ck-widget.ck-widget_selectable:hover .ck-widget__selection-handler{opacity:1;background-color:var(--ck-color-widget-hover-border)}.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected,.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected:hover{outline-color:var(--ck-color-widget-blurred-border)}.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected .ck-widget__selection-handler,.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected .ck-widget__selection-handler:hover,.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected:hover .ck-widget__selection-handler,.ck-editor__editable.ck-blurred .ck-widget.ck-widget_selected:hover .ck-widget__selection-handler:hover{background:var(--ck-color-widget-blurred-border)}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./balloonpanel.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./balloonpanel.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./balloonpanel.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \":root{--ck-balloon-panel-arrow-z-index:calc(var(--ck-z-default) - 3)}.ck.ck-balloon-panel{display:none;position:absolute;z-index:var(--ck-z-modal)}.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:after,.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:before{content:\\\"\\\";position:absolute}.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:before{z-index:var(--ck-balloon-panel-arrow-z-index)}.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:after{z-index:calc(var(--ck-balloon-panel-arrow-z-index) + 1)}.ck.ck-balloon-panel[class*=arrow_n]:before{z-index:var(--ck-balloon-panel-arrow-z-index)}.ck.ck-balloon-panel[class*=arrow_n]:after{z-index:calc(var(--ck-balloon-panel-arrow-z-index) + 1)}.ck.ck-balloon-panel[class*=arrow_s]:before{z-index:var(--ck-balloon-panel-arrow-z-index)}.ck.ck-balloon-panel[class*=arrow_s]:after{z-index:calc(var(--ck-balloon-panel-arrow-z-index) + 1)}.ck.ck-balloon-panel.ck-balloon-panel_visible{display:block}:root{--ck-balloon-arrow-offset:2px;--ck-balloon-arrow-height:10px;--ck-balloon-arrow-half-width:8px}.ck.ck-balloon-panel{border-radius:0}.ck-rounded-corners .ck.ck-balloon-panel,.ck.ck-balloon-panel.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-balloon-panel{box-shadow:var(--ck-drop-shadow),0 0;min-height:15px;background:var(--ck-color-panel-background);border:1px solid var(--ck-color-panel-border)}.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:after,.ck.ck-balloon-panel.ck-balloon-panel_with-arrow:before{width:0;height:0;border-style:solid}.ck.ck-balloon-panel[class*=arrow_n]:after,.ck.ck-balloon-panel[class*=arrow_n]:before{border-width:0 var(--ck-balloon-arrow-half-width) var(--ck-balloon-arrow-height)}.ck.ck-balloon-panel[class*=arrow_n]:before{border-color:transparent transparent var(--ck-color-panel-border)}.ck.ck-balloon-panel[class*=arrow_n]:after{border-color:transparent transparent var(--ck-color-panel-background);margin-top:var(--ck-balloon-arrow-offset)}.ck.ck-balloon-panel[class*=arrow_s]:after,.ck.ck-balloon-panel[class*=arrow_s]:before{border-width:var(--ck-balloon-arrow-height) var(--ck-balloon-arrow-half-width) 0}.ck.ck-balloon-panel[class*=arrow_s]:before{border-color:var(--ck-color-panel-border) transparent transparent}.ck.ck-balloon-panel[class*=arrow_s]:after{border-color:var(--ck-color-panel-background) transparent transparent;margin-bottom:var(--ck-balloon-arrow-offset)}.ck.ck-balloon-panel.ck-balloon-panel_arrow_n:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_n:before{left:50%;margin-left:calc(-1 * var(--ck-balloon-arrow-half-width));top:calc(-1 * var(--ck-balloon-arrow-height))}.ck.ck-balloon-panel.ck-balloon-panel_arrow_nw:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_nw:before{left:calc(2 * var(--ck-balloon-arrow-half-width));top:calc(-1 * var(--ck-balloon-arrow-height))}.ck.ck-balloon-panel.ck-balloon-panel_arrow_ne:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_ne:before{right:calc(2 * var(--ck-balloon-arrow-half-width));top:calc(-1 * var(--ck-balloon-arrow-height))}.ck.ck-balloon-panel.ck-balloon-panel_arrow_s:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_s:before{left:50%;margin-left:calc(-1 * var(--ck-balloon-arrow-half-width));bottom:calc(-1 * var(--ck-balloon-arrow-height))}.ck.ck-balloon-panel.ck-balloon-panel_arrow_sw:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_sw:before{left:calc(2 * var(--ck-balloon-arrow-half-width));bottom:calc(-1 * var(--ck-balloon-arrow-height))}.ck.ck-balloon-panel.ck-balloon-panel_arrow_se:after,.ck.ck-balloon-panel.ck-balloon-panel_arrow_se:before{right:calc(2 * var(--ck-balloon-arrow-half-width));bottom:calc(-1 * var(--ck-balloon-arrow-height))}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadprogress.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadprogress.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadprogress.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-content .image{position:relative;overflow:hidden}.ck-content .image .ck-progress-bar{position:absolute;top:0;left:0}:root{--ck-image-upload-progress-line-width:30px}.ck-content .image.ck-appear{animation:fadeIn .7s}.ck-content .image .ck-progress-bar{height:2px;width:0;background:var(--ck-color-upload-bar-background);transition:width .1s}@keyframes fadeIn{0%{opacity:0}to{opacity:1}}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadicon.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadicon.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadicon.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-image-upload-complete-icon{display:block;position:absolute;top:10px;right:10px;border-radius:50%}.ck-image-upload-complete-icon:after{content:\\\"\\\";position:absolute}:root{--ck-color-image-upload-icon:#fff;--ck-color-image-upload-icon-background:#008a00;--ck-image-upload-icon-size:20px;--ck-image-upload-icon-width:2px}.ck-image-upload-complete-icon{width:var(--ck-image-upload-icon-size);height:var(--ck-image-upload-icon-size);opacity:0;background:var(--ck-color-image-upload-icon-background);animation-name:ck-upload-complete-icon-show,ck-upload-complete-icon-hide;animation-fill-mode:forwards,forwards;animation-duration:.5s,.5s;font-size:var(--ck-image-upload-icon-size);animation-delay:0ms,3s}.ck-image-upload-complete-icon:after{left:25%;top:50%;opacity:0;height:0;width:0;transform:scaleX(-1) rotate(135deg);transform-origin:left top;border-top:var(--ck-image-upload-icon-width) solid var(--ck-color-image-upload-icon);border-right:var(--ck-image-upload-icon-width) solid var(--ck-color-image-upload-icon);animation-name:ck-upload-complete-icon-check;animation-duration:.5s;animation-delay:.5s;animation-fill-mode:forwards;box-sizing:border-box}@keyframes ck-upload-complete-icon-show{0%{opacity:0}to{opacity:1}}@keyframes ck-upload-complete-icon-hide{0%{opacity:1}to{opacity:0}}@keyframes ck-upload-complete-icon-check{0%{opacity:1;width:0;height:0}33%{width:.3em;height:0}to{opacity:1;width:.3em;height:.45em}}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadloader.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadloader.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imageuploadloader.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck .ck-upload-placeholder-loader{position:absolute;display:flex;align-items:center;justify-content:center;top:0;left:0}.ck .ck-upload-placeholder-loader:before{content:\\\"\\\";position:relative}:root{--ck-color-upload-placeholder-loader:#b3b3b3;--ck-upload-placeholder-loader-size:32px}.ck .ck-image-upload-placeholder{width:100%;margin:0}.ck .ck-upload-placeholder-loader{width:100%;height:100%}.ck .ck-upload-placeholder-loader:before{width:var(--ck-upload-placeholder-loader-size);height:var(--ck-upload-placeholder-loader-size);border-radius:50%;border-top:3px solid var(--ck-color-upload-placeholder-loader);border-right:2px solid transparent;animation:ck-upload-placeholder-loader 1s linear infinite}@keyframes ck-upload-placeholder-loader{to{transform:rotate(1turn)}}\"","module.exports = \".ck-content code{background-color:hsla(0,0%,78%,.3);padding:.15em;border-radius:2px}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./blockquote.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./blockquote.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./blockquote.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-content blockquote{overflow:hidden;padding-right:1.5em;padding-left:1.5em;margin-left:0;font-style:italic;border-left:5px solid #ccc}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./dropdown.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./dropdown.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./dropdown.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-dropdown{display:inline-block;position:relative}.ck.ck-dropdown .ck-dropdown__arrow{pointer-events:none;z-index:var(--ck-z-default)}.ck.ck-dropdown .ck-button.ck-dropdown__button{width:100%}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-on .ck-tooltip{display:none}.ck.ck-dropdown .ck-dropdown__panel{-webkit-backface-visibility:hidden;display:none;z-index:var(--ck-z-modal);position:absolute;left:0;transform:translate3d(0,100%,0)}.ck.ck-dropdown .ck-dropdown__panel.ck-dropdown__panel-visible{display:inline-block;will-change:transform}:root{--ck-dropdown-arrow-size:calc(0.5 * var(--ck-icon-size))}.ck.ck-dropdown{font-size:inherit}.ck.ck-dropdown .ck-dropdown__arrow{right:var(--ck-spacing-standard);width:var(--ck-dropdown-arrow-size);margin-left:var(--ck-spacing-small)}.ck.ck-dropdown.ck-disabled .ck-dropdown__arrow{opacity:var(--ck-disabled-opacity)}.ck.ck-dropdown .ck-button.ck-dropdown__button:not(.ck-button_with-text){padding-left:var(--ck-spacing-small)}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-disabled .ck-button__label{opacity:var(--ck-disabled-opacity)}.ck.ck-dropdown .ck-button.ck-dropdown__button.ck-on{border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-dropdown .ck-button.ck-dropdown__button .ck-button__label{width:7em;overflow:hidden;text-overflow:ellipsis}.ck.ck-dropdown__panel{border-radius:0;box-shadow:var(--ck-drop-shadow),0 0}.ck-rounded-corners .ck.ck-dropdown__panel,.ck.ck-dropdown__panel.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0}.ck.ck-dropdown__panel{background:var(--ck-color-dropdown-panel-background);border:1px solid var(--ck-color-dropdown-panel-border);bottom:0;min-width:100%}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./list.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./list.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./list.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-list{-moz-user-select:none;-webkit-user-select:none;-ms-user-select:none;user-select:none;display:flex;flex-direction:column}.ck.ck-list .ck-list__item,.ck.ck-list .ck-list__separator{display:block}.ck.ck-list .ck-list__item>:focus{position:relative;z-index:var(--ck-z-default)}.ck.ck-list{border-radius:0}.ck-rounded-corners .ck.ck-list,.ck.ck-list.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-list{list-style-type:none;background:var(--ck-color-list-background)}.ck.ck-list__item{cursor:default;min-width:12em}.ck.ck-list__item .ck-button{min-height:unset;width:100%;text-align:left;border-radius:0;border:0;padding:calc(.2*var(--ck-line-height-base)*var(--ck-font-size-base)) calc(.4*var(--ck-line-height-base)*var(--ck-font-size-base))}.ck.ck-list__item .ck-button .ck-button__label{line-height:calc(1.2*var(--ck-line-height-base)*var(--ck-font-size-base))}.ck.ck-list__item .ck-button:active{box-shadow:none}.ck.ck-list__item .ck-button.ck-on{background:var(--ck-color-list-button-on-background);color:var(--ck-color-list-button-on-text)}.ck.ck-list__item .ck-button.ck-on:hover:not(ck-disabled){background:var(--ck-color-list-button-on-background-focus)}.ck.ck-list__item .ck-button.ck-on:active{box-shadow:none}.ck.ck-list__item .ck-button:hover:not(.ck-disabled){background:var(--ck-color-list-button-hover-background)}.ck.ck-list__item .ck-switchbutton.ck-on{background:var(--ck-color-list-background);color:inherit}.ck.ck-list__item .ck-switchbutton.ck-on:hover:not(ck-disabled){background:var(--ck-color-list-button-hover-background);color:inherit}.ck.ck-list__separator{height:1px;width:100%;background:var(--ck-color-base-border)}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./switchbutton.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./switchbutton.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./switchbutton.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-button.ck-switchbutton .ck-button__toggle,.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{display:block}:root{--ck-switch-button-toggle-width:2.6153846154em;--ck-switch-button-toggle-inner-size:1.0769230769em;--ck-switch-button-toggle-spacing:1px}.ck.ck-button.ck-switchbutton .ck-button__label{margin-right:calc(2*var(--ck-spacing-large))}.ck.ck-button.ck-switchbutton.ck-disabled .ck-button__toggle{opacity:var(--ck-disabled-opacity)}.ck.ck-button.ck-switchbutton .ck-button__toggle{border-radius:0}.ck-rounded-corners .ck.ck-button.ck-switchbutton .ck-button__toggle,.ck.ck-button.ck-switchbutton .ck-button__toggle.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-button.ck-switchbutton .ck-button__toggle{margin-left:auto;transition:background .4s ease;width:var(--ck-switch-button-toggle-width);background:var(--ck-color-switch-button-off-background)}.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{border-radius:0}.ck-rounded-corners .ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner,.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner.ck-rounded-corners{border-radius:var(--ck-border-radius);border-radius:calc(.5*var(--ck-border-radius))}.ck.ck-button.ck-switchbutton .ck-button__toggle .ck-button__toggle__inner{margin:var(--ck-switch-button-toggle-spacing);width:var(--ck-switch-button-toggle-inner-size);height:var(--ck-switch-button-toggle-inner-size);background:var(--ck-color-switch-button-inner-background);transition:transform .3s ease}.ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle{background:var(--ck-color-switch-button-on-background)}.ck.ck-button.ck-switchbutton.ck-on .ck-button__toggle .ck-button__toggle__inner{transform:translateX(1.3846153847em)}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbardropdown.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbardropdown.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./toolbardropdown.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-toolbar-dropdown .ck-toolbar{flex-wrap:nowrap}.ck.ck-toolbar-dropdown .ck-dropdown__panel .ck-button:focus{z-index:calc(var(--ck-z-default) + 1)}.ck.ck-toolbar-dropdown .ck-toolbar{border:0}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./listdropdown.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./listdropdown.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./listdropdown.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-dropdown .ck-dropdown__panel .ck-list{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list,.ck.ck-dropdown .ck-dropdown__panel .ck-list.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0}.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button,.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:first-child .ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-bottom-left-radius:0;border-bottom-right-radius:0}.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button{border-radius:0}.ck-rounded-corners .ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button,.ck.ck-dropdown .ck-dropdown__panel .ck-list .ck-list__item:last-child .ck-button.ck-rounded-corners{border-radius:var(--ck-border-radius);border-top-left-radius:0;border-top-right-radius:0}\"","module.exports = \".ck.ck-heading_heading1{font-size:20px}.ck.ck-heading_heading2{font-size:17px}.ck.ck-heading_heading3{font-size:14px}.ck[class*=ck-heading_heading]{font-weight:700}.ck.ck-dropdown.ck-heading-dropdown .ck-dropdown__button .ck-button__label{width:8em}.ck.ck-dropdown.ck-heading-dropdown .ck-dropdown__panel .ck-list__item{min-width:18em}\"","\nvar content = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./inputtext.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./inputtext.css\", function() {\n\t\tvar newContent = require(\"!!../../../../../postcss-loader/lib/index.js??ref--5-1!./inputtext.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \":root{--ck-input-text-width:18em}.ck.ck-input-text{border-radius:0}.ck-rounded-corners .ck.ck-input-text,.ck.ck-input-text.ck-rounded-corners{border-radius:var(--ck-border-radius)}.ck.ck-input-text{box-shadow:var(--ck-inner-shadow),0 0;background:var(--ck-color-input-background);border:1px solid var(--ck-color-input-border);padding:var(--ck-spacing-extra-tiny) var(--ck-spacing-medium);min-width:var(--ck-input-text-width);min-height:var(--ck-ui-component-min-height);transition-property:box-shadow,border;transition:.2s ease-in-out}.ck.ck-input-text:focus{outline:none;border:var(--ck-focus-ring);box-shadow:var(--ck-focus-outer-shadow),var(--ck-inner-shadow)}.ck.ck-input-text[readonly]{border:1px solid var(--ck-color-input-disabled-border);background:var(--ck-color-input-disabled-background);color:var(--ck-color-input-disabled-text)}.ck.ck-input-text[readonly]:focus{box-shadow:var(--ck-focus-disabled-outer-shadow),var(--ck-inner-shadow)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./textalternativeform.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./textalternativeform.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./textalternativeform.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-text-alternative-form .ck-labeled-input{display:inline-block}.ck.ck-text-alternative-form .ck-label{display:none}.ck.ck-text-alternative-form{padding:var(--ck-spacing-standard)}.ck.ck-text-alternative-form:focus{outline:none}.ck.ck-text-alternative-form>:not(:first-child){margin-left:var(--ck-spacing-standard)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./image.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./image.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./image.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-content .image{clear:both;text-align:center}.ck-content .image>img{display:block;margin:0 auto;max-width:100%}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./placeholder.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./placeholder.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./placeholder.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-placeholder:before,.ck .ck-placeholder:before{content:attr(data-placeholder);pointer-events:none;cursor:text;color:var(--ck-color-engine-placeholder-text)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagecaption.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagecaption.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagecaption.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-content .image>figcaption{color:#333;background-color:#f7f7f7;padding:.6em;font-size:.75em;outline-offset:-1px}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagestyle.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagestyle.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./imagestyle.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \":root{--ck-image-style-spacing:1.5em}.ck-content .image-style-align-center,.ck-content .image-style-align-left,.ck-content .image-style-align-right,.ck-content .image-style-side{max-width:50%}.ck-content .image-style-side{float:right;margin-left:var(--ck-image-style-spacing)}.ck-content .image-style-align-left{float:left;margin-right:var(--ck-image-style-spacing)}.ck-content .image-style-align-center{margin-left:auto;margin-right:auto}.ck-content .image-style-align-right{float:right;margin-left:var(--ck-image-style-spacing)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./link.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./link.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./link.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck .ck-link_selected{background:var(--ck-color-link-selected-background)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkform.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkform.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkform.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-link-form .ck-labeled-input{display:inline-block}.ck.ck-link-form .ck-label{display:none}.ck.ck-link-form{padding:var(--ck-spacing-standard)}.ck.ck-link-form:focus{outline:none}.ck.ck-link-form>:not(:first-child){margin-left:var(--ck-spacing-standard)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkactions.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkactions.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./linkactions.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck.ck-link-actions .ck-link-actions__preview{display:inline-block}.ck.ck-link-actions .ck-link-actions__preview .ck-button__label{overflow:hidden}.ck.ck-link-actions{padding:var(--ck-spacing-standard)}.ck.ck-link-actions .ck-button.ck-link-actions__preview{padding-left:0;padding-right:0}.ck.ck-link-actions .ck-button.ck-link-actions__preview,.ck.ck-link-actions .ck-button.ck-link-actions__preview:active,.ck.ck-link-actions .ck-button.ck-link-actions__preview:focus,.ck.ck-link-actions .ck-button.ck-link-actions__preview:hover{background:none}.ck.ck-link-actions .ck-button.ck-link-actions__preview:active{box-shadow:none}.ck.ck-link-actions .ck-button.ck-link-actions__preview:focus .ck-button__label{text-decoration:underline}.ck.ck-link-actions .ck-button.ck-link-actions__preview .ck-button__label{padding:0 var(--ck-spacing-medium);color:var(--ck-color-link-default);text-overflow:ellipsis;cursor:pointer;max-width:var(--ck-input-text-width);min-width:3em;text-align:center}.ck.ck-link-actions .ck-button.ck-link-actions__preview .ck-button__label:hover{text-decoration:underline}.ck.ck-link-actions:focus{outline:none}.ck.ck-link-actions>:not(:first-child){margin-left:var(--ck-spacing-standard)}\"","'use strict';\n\n\nmodule.exports = require('./lib/');\n","// Main parser class\n\n'use strict';\n\n\nvar utils        = require('./common/utils');\nvar helpers      = require('./helpers');\nvar Renderer     = require('./renderer');\nvar ParserCore   = require('./parser_core');\nvar ParserBlock  = require('./parser_block');\nvar ParserInline = require('./parser_inline');\nvar LinkifyIt    = require('linkify-it');\nvar mdurl        = require('mdurl');\nvar punycode     = require('punycode');\n\n\nvar config = {\n  'default': require('./presets/default'),\n  zero: require('./presets/zero'),\n  commonmark: require('./presets/commonmark')\n};\n\n////////////////////////////////////////////////////////////////////////////////\n//\n// This validator can prohibit more than really needed to prevent XSS. It's a\n// tradeoff to keep code simple and to be secure by default.\n//\n// If you need different setup - override validator method as you wish. Or\n// replace it with dummy function and use external sanitizer.\n//\n\nvar BAD_PROTO_RE = /^(vbscript|javascript|file|data):/;\nvar GOOD_DATA_RE = /^data:image\\/(gif|png|jpeg|webp);/;\n\nfunction validateLink(url) {\n  // url should be normalized at this point, and existing entities are decoded\n  var str = url.trim().toLowerCase();\n\n  return BAD_PROTO_RE.test(str) ? (GOOD_DATA_RE.test(str) ? true : false) : true;\n}\n\n////////////////////////////////////////////////////////////////////////////////\n\n\nvar RECODE_HOSTNAME_FOR = [ 'http:', 'https:', 'mailto:' ];\n\nfunction normalizeLink(url) {\n  var parsed = mdurl.parse(url, true);\n\n  if (parsed.hostname) {\n    // Encode hostnames in urls like:\n    // `http://host/`, `https://host/`, `mailto:user@host`, `//host/`\n    //\n    // We don't encode unknown schemas, because it's likely that we encode\n    // something we shouldn't (e.g. `skype:name` treated as `skype:host`)\n    //\n    if (!parsed.protocol || RECODE_HOSTNAME_FOR.indexOf(parsed.protocol) >= 0) {\n      try {\n        parsed.hostname = punycode.toASCII(parsed.hostname);\n      } catch (er) { /**/ }\n    }\n  }\n\n  return mdurl.encode(mdurl.format(parsed));\n}\n\nfunction normalizeLinkText(url) {\n  var parsed = mdurl.parse(url, true);\n\n  if (parsed.hostname) {\n    // Encode hostnames in urls like:\n    // `http://host/`, `https://host/`, `mailto:user@host`, `//host/`\n    //\n    // We don't encode unknown schemas, because it's likely that we encode\n    // something we shouldn't (e.g. `skype:name` treated as `skype:host`)\n    //\n    if (!parsed.protocol || RECODE_HOSTNAME_FOR.indexOf(parsed.protocol) >= 0) {\n      try {\n        parsed.hostname = punycode.toUnicode(parsed.hostname);\n      } catch (er) { /**/ }\n    }\n  }\n\n  return mdurl.decode(mdurl.format(parsed));\n}\n\n\n/**\n * class MarkdownIt\n *\n * Main parser/renderer class.\n *\n * ##### Usage\n *\n * ```javascript\n * // node.js, \"classic\" way:\n * var MarkdownIt = require('markdown-it'),\n *     md = new MarkdownIt();\n * var result = md.render('# markdown-it rulezz!');\n *\n * // node.js, the same, but with sugar:\n * var md = require('markdown-it')();\n * var result = md.render('# markdown-it rulezz!');\n *\n * // browser without AMD, added to \"window\" on script load\n * // Note, there are no dash.\n * var md = window.markdownit();\n * var result = md.render('# markdown-it rulezz!');\n * ```\n *\n * Single line rendering, without paragraph wrap:\n *\n * ```javascript\n * var md = require('markdown-it')();\n * var result = md.renderInline('__markdown-it__ rulezz!');\n * ```\n **/\n\n/**\n * new MarkdownIt([presetName, options])\n * - presetName (String): optional, `commonmark` / `zero`\n * - options (Object)\n *\n * Creates parser instanse with given config. Can be called without `new`.\n *\n * ##### presetName\n *\n * MarkdownIt provides named presets as a convenience to quickly\n * enable/disable active syntax rules and options for common use cases.\n *\n * - [\"commonmark\"](https://github.com/markdown-it/markdown-it/blob/master/lib/presets/commonmark.js) -\n *   configures parser to strict [CommonMark](http://commonmark.org/) mode.\n * - [default](https://github.com/markdown-it/markdown-it/blob/master/lib/presets/default.js) -\n *   similar to GFM, used when no preset name given. Enables all available rules,\n *   but still without html, typographer & autolinker.\n * - [\"zero\"](https://github.com/markdown-it/markdown-it/blob/master/lib/presets/zero.js) -\n *   all rules disabled. Useful to quickly setup your config via `.enable()`.\n *   For example, when you need only `bold` and `italic` markup and nothing else.\n *\n * ##### options:\n *\n * - __html__ - `false`. Set `true` to enable HTML tags in source. Be careful!\n *   That's not safe! You may need external sanitizer to protect output from XSS.\n *   It's better to extend features via plugins, instead of enabling HTML.\n * - __xhtmlOut__ - `false`. Set `true` to add '/' when closing single tags\n *   (`<br />`). This is needed only for full CommonMark compatibility. In real\n *   world you will need HTML output.\n * - __breaks__ - `false`. Set `true` to convert `\\n` in paragraphs into `<br>`.\n * - __langPrefix__ - `language-`. CSS language class prefix for fenced blocks.\n *   Can be useful for external highlighters.\n * - __linkify__ - `false`. Set `true` to autoconvert URL-like text to links.\n * - __typographer__  - `false`. Set `true` to enable [some language-neutral\n *   replacement](https://github.com/markdown-it/markdown-it/blob/master/lib/rules_core/replacements.js) +\n *   quotes beautification (smartquotes).\n * - __quotes__ - `“”‘’`, String or Array. Double + single quotes replacement\n *   pairs, when typographer enabled and smartquotes on. For example, you can\n *   use `'«»„“'` for Russian, `'„“‚‘'` for German, and\n *   `['«\\xA0', '\\xA0»', '‹\\xA0', '\\xA0›']` for French (including nbsp).\n * - __highlight__ - `null`. Highlighter function for fenced code blocks.\n *   Highlighter `function (str, lang)` should return escaped HTML. It can also\n *   return empty string if the source was not changed and should be escaped\n *   externaly. If result starts with <pre... internal wrapper is skipped.\n *\n * ##### Example\n *\n * ```javascript\n * // commonmark mode\n * var md = require('markdown-it')('commonmark');\n *\n * // default mode\n * var md = require('markdown-it')();\n *\n * // enable everything\n * var md = require('markdown-it')({\n *   html: true,\n *   linkify: true,\n *   typographer: true\n * });\n * ```\n *\n * ##### Syntax highlighting\n *\n * ```js\n * var hljs = require('highlight.js') // https://highlightjs.org/\n *\n * var md = require('markdown-it')({\n *   highlight: function (str, lang) {\n *     if (lang && hljs.getLanguage(lang)) {\n *       try {\n *         return hljs.highlight(lang, str, true).value;\n *       } catch (__) {}\n *     }\n *\n *     return ''; // use external default escaping\n *   }\n * });\n * ```\n *\n * Or with full wrapper override (if you need assign class to `<pre>`):\n *\n * ```javascript\n * var hljs = require('highlight.js') // https://highlightjs.org/\n *\n * // Actual default values\n * var md = require('markdown-it')({\n *   highlight: function (str, lang) {\n *     if (lang && hljs.getLanguage(lang)) {\n *       try {\n *         return '<pre class=\"hljs\"><code>' +\n *                hljs.highlight(lang, str, true).value +\n *                '</code></pre>';\n *       } catch (__) {}\n *     }\n *\n *     return '<pre class=\"hljs\"><code>' + md.utils.escapeHtml(str) + '</code></pre>';\n *   }\n * });\n * ```\n *\n **/\nfunction MarkdownIt(presetName, options) {\n  if (!(this instanceof MarkdownIt)) {\n    return new MarkdownIt(presetName, options);\n  }\n\n  if (!options) {\n    if (!utils.isString(presetName)) {\n      options = presetName || {};\n      presetName = 'default';\n    }\n  }\n\n  /**\n   * MarkdownIt#inline -> ParserInline\n   *\n   * Instance of [[ParserInline]]. You may need it to add new rules when\n   * writing plugins. For simple rules control use [[MarkdownIt.disable]] and\n   * [[MarkdownIt.enable]].\n   **/\n  this.inline = new ParserInline();\n\n  /**\n   * MarkdownIt#block -> ParserBlock\n   *\n   * Instance of [[ParserBlock]]. You may need it to add new rules when\n   * writing plugins. For simple rules control use [[MarkdownIt.disable]] and\n   * [[MarkdownIt.enable]].\n   **/\n  this.block = new ParserBlock();\n\n  /**\n   * MarkdownIt#core -> Core\n   *\n   * Instance of [[Core]] chain executor. You may need it to add new rules when\n   * writing plugins. For simple rules control use [[MarkdownIt.disable]] and\n   * [[MarkdownIt.enable]].\n   **/\n  this.core = new ParserCore();\n\n  /**\n   * MarkdownIt#renderer -> Renderer\n   *\n   * Instance of [[Renderer]]. Use it to modify output look. Or to add rendering\n   * rules for new token types, generated by plugins.\n   *\n   * ##### Example\n   *\n   * ```javascript\n   * var md = require('markdown-it')();\n   *\n   * function myToken(tokens, idx, options, env, self) {\n   *   //...\n   *   return result;\n   * };\n   *\n   * md.renderer.rules['my_token'] = myToken\n   * ```\n   *\n   * See [[Renderer]] docs and [source code](https://github.com/markdown-it/markdown-it/blob/master/lib/renderer.js).\n   **/\n  this.renderer = new Renderer();\n\n  /**\n   * MarkdownIt#linkify -> LinkifyIt\n   *\n   * [linkify-it](https://github.com/markdown-it/linkify-it) instance.\n   * Used by [linkify](https://github.com/markdown-it/markdown-it/blob/master/lib/rules_core/linkify.js)\n   * rule.\n   **/\n  this.linkify = new LinkifyIt();\n\n  /**\n   * MarkdownIt#validateLink(url) -> Boolean\n   *\n   * Link validation function. CommonMark allows too much in links. By default\n   * we disable `javascript:`, `vbscript:`, `file:` schemas, and almost all `data:...` schemas\n   * except some embedded image types.\n   *\n   * You can change this behaviour:\n   *\n   * ```javascript\n   * var md = require('markdown-it')();\n   * // enable everything\n   * md.validateLink = function () { return true; }\n   * ```\n   **/\n  this.validateLink = validateLink;\n\n  /**\n   * MarkdownIt#normalizeLink(url) -> String\n   *\n   * Function used to encode link url to a machine-readable format,\n   * which includes url-encoding, punycode, etc.\n   **/\n  this.normalizeLink = normalizeLink;\n\n  /**\n   * MarkdownIt#normalizeLinkText(url) -> String\n   *\n   * Function used to decode link url to a human-readable format`\n   **/\n  this.normalizeLinkText = normalizeLinkText;\n\n\n  // Expose utils & helpers for easy acces from plugins\n\n  /**\n   * MarkdownIt#utils -> utils\n   *\n   * Assorted utility functions, useful to write plugins. See details\n   * [here](https://github.com/markdown-it/markdown-it/blob/master/lib/common/utils.js).\n   **/\n  this.utils = utils;\n\n  /**\n   * MarkdownIt#helpers -> helpers\n   *\n   * Link components parser functions, useful to write plugins. See details\n   * [here](https://github.com/markdown-it/markdown-it/blob/master/lib/helpers).\n   **/\n  this.helpers = utils.assign({}, helpers);\n\n\n  this.options = {};\n  this.configure(presetName);\n\n  if (options) { this.set(options); }\n}\n\n\n/** chainable\n * MarkdownIt.set(options)\n *\n * Set parser options (in the same format as in constructor). Probably, you\n * will never need it, but you can change options after constructor call.\n *\n * ##### Example\n *\n * ```javascript\n * var md = require('markdown-it')()\n *             .set({ html: true, breaks: true })\n *             .set({ typographer, true });\n * ```\n *\n * __Note:__ To achieve the best possible performance, don't modify a\n * `markdown-it` instance options on the fly. If you need multiple configurations\n * it's best to create multiple instances and initialize each with separate\n * config.\n **/\nMarkdownIt.prototype.set = function (options) {\n  utils.assign(this.options, options);\n  return this;\n};\n\n\n/** chainable, internal\n * MarkdownIt.configure(presets)\n *\n * Batch load of all options and compenent settings. This is internal method,\n * and you probably will not need it. But if you with - see available presets\n * and data structure [here](https://github.com/markdown-it/markdown-it/tree/master/lib/presets)\n *\n * We strongly recommend to use presets instead of direct config loads. That\n * will give better compatibility with next versions.\n **/\nMarkdownIt.prototype.configure = function (presets) {\n  var self = this, presetName;\n\n  if (utils.isString(presets)) {\n    presetName = presets;\n    presets = config[presetName];\n    if (!presets) { throw new Error('Wrong `markdown-it` preset \"' + presetName + '\", check name'); }\n  }\n\n  if (!presets) { throw new Error('Wrong `markdown-it` preset, can\\'t be empty'); }\n\n  if (presets.options) { self.set(presets.options); }\n\n  if (presets.components) {\n    Object.keys(presets.components).forEach(function (name) {\n      if (presets.components[name].rules) {\n        self[name].ruler.enableOnly(presets.components[name].rules);\n      }\n      if (presets.components[name].rules2) {\n        self[name].ruler2.enableOnly(presets.components[name].rules2);\n      }\n    });\n  }\n  return this;\n};\n\n\n/** chainable\n * MarkdownIt.enable(list, ignoreInvalid)\n * - list (String|Array): rule name or list of rule names to enable\n * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.\n *\n * Enable list or rules. It will automatically find appropriate components,\n * containing rules with given names. If rule not found, and `ignoreInvalid`\n * not set - throws exception.\n *\n * ##### Example\n *\n * ```javascript\n * var md = require('markdown-it')()\n *             .enable(['sub', 'sup'])\n *             .disable('smartquotes');\n * ```\n **/\nMarkdownIt.prototype.enable = function (list, ignoreInvalid) {\n  var result = [];\n\n  if (!Array.isArray(list)) { list = [ list ]; }\n\n  [ 'core', 'block', 'inline' ].forEach(function (chain) {\n    result = result.concat(this[chain].ruler.enable(list, true));\n  }, this);\n\n  result = result.concat(this.inline.ruler2.enable(list, true));\n\n  var missed = list.filter(function (name) { return result.indexOf(name) < 0; });\n\n  if (missed.length && !ignoreInvalid) {\n    throw new Error('MarkdownIt. Failed to enable unknown rule(s): ' + missed);\n  }\n\n  return this;\n};\n\n\n/** chainable\n * MarkdownIt.disable(list, ignoreInvalid)\n * - list (String|Array): rule name or list of rule names to disable.\n * - ignoreInvalid (Boolean): set `true` to ignore errors when rule not found.\n *\n * The same as [[MarkdownIt.enable]], but turn specified rules off.\n **/\nMarkdownIt.prototype.disable = function (list, ignoreInvalid) {\n  var result = [];\n\n  if (!Array.isArray(list)) { list = [ list ]; }\n\n  [ 'core', 'block', 'inline' ].forEach(function (chain) {\n    result = result.concat(this[chain].ruler.disable(list, true));\n  }, this);\n\n  result = result.concat(this.inline.ruler2.disable(list, true));\n\n  var missed = list.filter(function (name) { return result.indexOf(name) < 0; });\n\n  if (missed.length && !ignoreInvalid) {\n    throw new Error('MarkdownIt. Failed to disable unknown rule(s): ' + missed);\n  }\n  return this;\n};\n\n\n/** chainable\n * MarkdownIt.use(plugin, params)\n *\n * Load specified plugin with given params into current parser instance.\n * It's just a sugar to call `plugin(md, params)` with curring.\n *\n * ##### Example\n *\n * ```javascript\n * var iterator = require('markdown-it-for-inline');\n * var md = require('markdown-it')()\n *             .use(iterator, 'foo_replace', 'text', function (tokens, idx) {\n *               tokens[idx].content = tokens[idx].content.replace(/foo/g, 'bar');\n *             });\n * ```\n **/\nMarkdownIt.prototype.use = function (plugin /*, params, ... */) {\n  var args = [ this ].concat(Array.prototype.slice.call(arguments, 1));\n  plugin.apply(plugin, args);\n  return this;\n};\n\n\n/** internal\n * MarkdownIt.parse(src, env) -> Array\n * - src (String): source string\n * - env (Object): environment sandbox\n *\n * Parse input string and returns list of block tokens (special token type\n * \"inline\" will contain list of inline tokens). You should not call this\n * method directly, until you write custom renderer (for example, to produce\n * AST).\n *\n * `env` is used to pass data between \"distributed\" rules and return additional\n * metadata like reference info, needed for the renderer. It also can be used to\n * inject data in specific cases. Usually, you will be ok to pass `{}`,\n * and then pass updated object to renderer.\n **/\nMarkdownIt.prototype.parse = function (src, env) {\n  if (typeof src !== 'string') {\n    throw new Error('Input data should be a String');\n  }\n\n  var state = new this.core.State(src, this, env);\n\n  this.core.process(state);\n\n  return state.tokens;\n};\n\n\n/**\n * MarkdownIt.render(src [, env]) -> String\n * - src (String): source string\n * - env (Object): environment sandbox\n *\n * Render markdown string into html. It does all magic for you :).\n *\n * `env` can be used to inject additional metadata (`{}` by default).\n * But you will not need it with high probability. See also comment\n * in [[MarkdownIt.parse]].\n **/\nMarkdownIt.prototype.render = function (src, env) {\n  env = env || {};\n\n  return this.renderer.render(this.parse(src, env), this.options, env);\n};\n\n\n/** internal\n * MarkdownIt.parseInline(src, env) -> Array\n * - src (String): source string\n * - env (Object): environment sandbox\n *\n * The same as [[MarkdownIt.parse]] but skip all block rules. It returns the\n * block tokens list with the single `inline` element, containing parsed inline\n * tokens in `children` property. Also updates `env` object.\n **/\nMarkdownIt.prototype.parseInline = function (src, env) {\n  var state = new this.core.State(src, this, env);\n\n  state.inlineMode = true;\n  this.core.process(state);\n\n  return state.tokens;\n};\n\n\n/**\n * MarkdownIt.renderInline(src [, env]) -> String\n * - src (String): source string\n * - env (Object): environment sandbox\n *\n * Similar to [[MarkdownIt.render]] but for single paragraph content. Result\n * will NOT be wrapped into `<p>` tags.\n **/\nMarkdownIt.prototype.renderInline = function (src, env) {\n  env = env || {};\n\n  return this.renderer.render(this.parseInline(src, env), this.options, env);\n};\n\n\nmodule.exports = MarkdownIt;\n","\n'use strict';\n\n\nvar encodeCache = {};\n\n\n// Create a lookup array where anything but characters in `chars` string\n// and alphanumeric chars is percent-encoded.\n//\nfunction getEncodeCache(exclude) {\n  var i, ch, cache = encodeCache[exclude];\n  if (cache) { return cache; }\n\n  cache = encodeCache[exclude] = [];\n\n  for (i = 0; i < 128; i++) {\n    ch = String.fromCharCode(i);\n\n    if (/^[0-9a-z]$/i.test(ch)) {\n      // always allow unencoded alphanumeric characters\n      cache.push(ch);\n    } else {\n      cache.push('%' + ('0' + i.toString(16).toUpperCase()).slice(-2));\n    }\n  }\n\n  for (i = 0; i < exclude.length; i++) {\n    cache[exclude.charCodeAt(i)] = exclude[i];\n  }\n\n  return cache;\n}\n\n\n// Encode unsafe characters with percent-encoding, skipping already\n// encoded sequences.\n//\n//  - string       - string to encode\n//  - exclude      - list of characters to ignore (in addition to a-zA-Z0-9)\n//  - keepEscaped  - don't encode '%' in a correct escape sequence (default: true)\n//\nfunction encode(string, exclude, keepEscaped) {\n  var i, l, code, nextCode, cache,\n      result = '';\n\n  if (typeof exclude !== 'string') {\n    // encode(string, keepEscaped)\n    keepEscaped  = exclude;\n    exclude = encode.defaultChars;\n  }\n\n  if (typeof keepEscaped === 'undefined') {\n    keepEscaped = true;\n  }\n\n  cache = getEncodeCache(exclude);\n\n  for (i = 0, l = string.length; i < l; i++) {\n    code = string.charCodeAt(i);\n\n    if (keepEscaped && code === 0x25 /* % */ && i + 2 < l) {\n      if (/^[0-9a-f]{2}$/i.test(string.slice(i + 1, i + 3))) {\n        result += string.slice(i, i + 3);\n        i += 2;\n        continue;\n      }\n    }\n\n    if (code < 128) {\n      result += cache[code];\n      continue;\n    }\n\n    if (code >= 0xD800 && code <= 0xDFFF) {\n      if (code >= 0xD800 && code <= 0xDBFF && i + 1 < l) {\n        nextCode = string.charCodeAt(i + 1);\n        if (nextCode >= 0xDC00 && nextCode <= 0xDFFF) {\n          result += encodeURIComponent(string[i] + string[i + 1]);\n          i++;\n          continue;\n        }\n      }\n      result += '%EF%BF%BD';\n      continue;\n    }\n\n    result += encodeURIComponent(string[i]);\n  }\n\n  return result;\n}\n\nencode.defaultChars   = \";/?:@&=+$,-_.!~*'()#\";\nencode.componentChars = \"-_.!~*'()\";\n\n\nmodule.exports = encode;\n","\n'use strict';\n\n\n/* eslint-disable no-bitwise */\n\nvar decodeCache = {};\n\nfunction getDecodeCache(exclude) {\n  var i, ch, cache = decodeCache[exclude];\n  if (cache) { return cache; }\n\n  cache = decodeCache[exclude] = [];\n\n  for (i = 0; i < 128; i++) {\n    ch = String.fromCharCode(i);\n    cache.push(ch);\n  }\n\n  for (i = 0; i < exclude.length; i++) {\n    ch = exclude.charCodeAt(i);\n    cache[ch] = '%' + ('0' + ch.toString(16).toUpperCase()).slice(-2);\n  }\n\n  return cache;\n}\n\n\n// Decode percent-encoded string.\n//\nfunction decode(string, exclude) {\n  var cache;\n\n  if (typeof exclude !== 'string') {\n    exclude = decode.defaultChars;\n  }\n\n  cache = getDecodeCache(exclude);\n\n  return string.replace(/(%[a-f0-9]{2})+/gi, function(seq) {\n    var i, l, b1, b2, b3, b4, chr,\n        result = '';\n\n    for (i = 0, l = seq.length; i < l; i += 3) {\n      b1 = parseInt(seq.slice(i + 1, i + 3), 16);\n\n      if (b1 < 0x80) {\n        result += cache[b1];\n        continue;\n      }\n\n      if ((b1 & 0xE0) === 0xC0 && (i + 3 < l)) {\n        // 110xxxxx 10xxxxxx\n        b2 = parseInt(seq.slice(i + 4, i + 6), 16);\n\n        if ((b2 & 0xC0) === 0x80) {\n          chr = ((b1 << 6) & 0x7C0) | (b2 & 0x3F);\n\n          if (chr < 0x80) {\n            result += '\\ufffd\\ufffd';\n          } else {\n            result += String.fromCharCode(chr);\n          }\n\n          i += 3;\n          continue;\n        }\n      }\n\n      if ((b1 & 0xF0) === 0xE0 && (i + 6 < l)) {\n        // 1110xxxx 10xxxxxx 10xxxxxx\n        b2 = parseInt(seq.slice(i + 4, i + 6), 16);\n        b3 = parseInt(seq.slice(i + 7, i + 9), 16);\n\n        if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80) {\n          chr = ((b1 << 12) & 0xF000) | ((b2 << 6) & 0xFC0) | (b3 & 0x3F);\n\n          if (chr < 0x800 || (chr >= 0xD800 && chr <= 0xDFFF)) {\n            result += '\\ufffd\\ufffd\\ufffd';\n          } else {\n            result += String.fromCharCode(chr);\n          }\n\n          i += 6;\n          continue;\n        }\n      }\n\n      if ((b1 & 0xF8) === 0xF0 && (i + 9 < l)) {\n        // 111110xx 10xxxxxx 10xxxxxx 10xxxxxx\n        b2 = parseInt(seq.slice(i + 4, i + 6), 16);\n        b3 = parseInt(seq.slice(i + 7, i + 9), 16);\n        b4 = parseInt(seq.slice(i + 10, i + 12), 16);\n\n        if ((b2 & 0xC0) === 0x80 && (b3 & 0xC0) === 0x80 && (b4 & 0xC0) === 0x80) {\n          chr = ((b1 << 18) & 0x1C0000) | ((b2 << 12) & 0x3F000) | ((b3 << 6) & 0xFC0) | (b4 & 0x3F);\n\n          if (chr < 0x10000 || chr > 0x10FFFF) {\n            result += '\\ufffd\\ufffd\\ufffd\\ufffd';\n          } else {\n            chr -= 0x10000;\n            result += String.fromCharCode(0xD800 + (chr >> 10), 0xDC00 + (chr & 0x3FF));\n          }\n\n          i += 9;\n          continue;\n        }\n      }\n\n      result += '\\ufffd';\n    }\n\n    return result;\n  });\n}\n\n\ndecode.defaultChars   = ';/?:@&=+$,#';\ndecode.componentChars = '';\n\n\nmodule.exports = decode;\n","\n'use strict';\n\n\nmodule.exports = function format(url) {\n  var result = '';\n\n  result += url.protocol || '';\n  result += url.slashes ? '//' : '';\n  result += url.auth ? url.auth + '@' : '';\n\n  if (url.hostname && url.hostname.indexOf(':') !== -1) {\n    // ipv6 address\n    result += '[' + url.hostname + ']';\n  } else {\n    result += url.hostname || '';\n  }\n\n  result += url.port ? ':' + url.port : '';\n  result += url.pathname || '';\n  result += url.search || '';\n  result += url.hash || '';\n\n  return result;\n};\n","// Copyright Joyent, Inc. and other Node contributors.\n//\n// Permission is hereby granted, free of charge, to any person obtaining a\n// copy of this software and associated documentation files (the\n// \"Software\"), to deal in the Software without restriction, including\n// without limitation the rights to use, copy, modify, merge, publish,\n// distribute, sublicense, and/or sell copies of the Software, and to permit\n// persons to whom the Software is furnished to do so, subject to the\n// following conditions:\n//\n// The above copyright notice and this permission notice shall be included\n// in all copies or substantial portions of the Software.\n//\n// THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS\n// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF\n// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN\n// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,\n// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR\n// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE\n// USE OR OTHER DEALINGS IN THE SOFTWARE.\n\n'use strict';\n\n//\n// Changes from joyent/node:\n//\n// 1. No leading slash in paths,\n//    e.g. in `url.parse('http://foo?bar')` pathname is ``, not `/`\n//\n// 2. Backslashes are not replaced with slashes,\n//    so `http:\\\\example.org\\` is treated like a relative path\n//\n// 3. Trailing colon is treated like a part of the path,\n//    i.e. in `http://example.org:foo` pathname is `:foo`\n//\n// 4. Nothing is URL-encoded in the resulting object,\n//    (in joyent/node some chars in auth and paths are encoded)\n//\n// 5. `url.parse()` does not have `parseQueryString` argument\n//\n// 6. Removed extraneous result properties: `host`, `path`, `query`, etc.,\n//    which can be constructed using other parts of the url.\n//\n\n\nfunction Url() {\n  this.protocol = null;\n  this.slashes = null;\n  this.auth = null;\n  this.port = null;\n  this.hostname = null;\n  this.hash = null;\n  this.search = null;\n  this.pathname = null;\n}\n\n// Reference: RFC 3986, RFC 1808, RFC 2396\n\n// define these here so at least they only have to be\n// compiled once on the first module load.\nvar protocolPattern = /^([a-z0-9.+-]+:)/i,\n    portPattern = /:[0-9]*$/,\n\n    // Special case for a simple path URL\n    simplePathPattern = /^(\\/\\/?(?!\\/)[^\\?\\s]*)(\\?[^\\s]*)?$/,\n\n    // RFC 2396: characters reserved for delimiting URLs.\n    // We actually just auto-escape these.\n    delims = [ '<', '>', '\"', '`', ' ', '\\r', '\\n', '\\t' ],\n\n    // RFC 2396: characters not allowed for various reasons.\n    unwise = [ '{', '}', '|', '\\\\', '^', '`' ].concat(delims),\n\n    // Allowed by RFCs, but cause of XSS attacks.  Always escape these.\n    autoEscape = [ '\\'' ].concat(unwise),\n    // Characters that are never ever allowed in a hostname.\n    // Note that any invalid chars are also handled, but these\n    // are the ones that are *expected* to be seen, so we fast-path\n    // them.\n    nonHostChars = [ '%', '/', '?', ';', '#' ].concat(autoEscape),\n    hostEndingChars = [ '/', '?', '#' ],\n    hostnameMaxLen = 255,\n    hostnamePartPattern = /^[+a-z0-9A-Z_-]{0,63}$/,\n    hostnamePartStart = /^([+a-z0-9A-Z_-]{0,63})(.*)$/,\n    // protocols that can allow \"unsafe\" and \"unwise\" chars.\n    /* eslint-disable no-script-url */\n    // protocols that never have a hostname.\n    hostlessProtocol = {\n      'javascript': true,\n      'javascript:': true\n    },\n    // protocols that always contain a // bit.\n    slashedProtocol = {\n      'http': true,\n      'https': true,\n      'ftp': true,\n      'gopher': true,\n      'file': true,\n      'http:': true,\n      'https:': true,\n      'ftp:': true,\n      'gopher:': true,\n      'file:': true\n    };\n    /* eslint-enable no-script-url */\n\nfunction urlParse(url, slashesDenoteHost) {\n  if (url && url instanceof Url) { return url; }\n\n  var u = new Url();\n  u.parse(url, slashesDenoteHost);\n  return u;\n}\n\nUrl.prototype.parse = function(url, slashesDenoteHost) {\n  var i, l, lowerProto, hec, slashes,\n      rest = url;\n\n  // trim before proceeding.\n  // This is to support parse stuff like \"  http://foo.com  \\n\"\n  rest = rest.trim();\n\n  if (!slashesDenoteHost && url.split('#').length === 1) {\n    // Try fast path regexp\n    var simplePath = simplePathPattern.exec(rest);\n    if (simplePath) {\n      this.pathname = simplePath[1];\n      if (simplePath[2]) {\n        this.search = simplePath[2];\n      }\n      return this;\n    }\n  }\n\n  var proto = protocolPattern.exec(rest);\n  if (proto) {\n    proto = proto[0];\n    lowerProto = proto.toLowerCase();\n    this.protocol = proto;\n    rest = rest.substr(proto.length);\n  }\n\n  // figure out if it's got a host\n  // user@server is *always* interpreted as a hostname, and url\n  // resolution will treat //foo/bar as host=foo,path=bar because that's\n  // how the browser resolves relative URLs.\n  if (slashesDenoteHost || proto || rest.match(/^\\/\\/[^@\\/]+@[^@\\/]+/)) {\n    slashes = rest.substr(0, 2) === '//';\n    if (slashes && !(proto && hostlessProtocol[proto])) {\n      rest = rest.substr(2);\n      this.slashes = true;\n    }\n  }\n\n  if (!hostlessProtocol[proto] &&\n      (slashes || (proto && !slashedProtocol[proto]))) {\n\n    // there's a hostname.\n    // the first instance of /, ?, ;, or # ends the host.\n    //\n    // If there is an @ in the hostname, then non-host chars *are* allowed\n    // to the left of the last @ sign, unless some host-ending character\n    // comes *before* the @-sign.\n    // URLs are obnoxious.\n    //\n    // ex:\n    // http://a@b@c/ => user:a@b host:c\n    // http://a@b?@c => user:a host:c path:/?@c\n\n    // v0.12 TODO(isaacs): This is not quite how Chrome does things.\n    // Review our test case against browsers more comprehensively.\n\n    // find the first instance of any hostEndingChars\n    var hostEnd = -1;\n    for (i = 0; i < hostEndingChars.length; i++) {\n      hec = rest.indexOf(hostEndingChars[i]);\n      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd)) {\n        hostEnd = hec;\n      }\n    }\n\n    // at this point, either we have an explicit point where the\n    // auth portion cannot go past, or the last @ char is the decider.\n    var auth, atSign;\n    if (hostEnd === -1) {\n      // atSign can be anywhere.\n      atSign = rest.lastIndexOf('@');\n    } else {\n      // atSign must be in auth portion.\n      // http://a@b/c@d => host:b auth:a path:/c@d\n      atSign = rest.lastIndexOf('@', hostEnd);\n    }\n\n    // Now we have a portion which is definitely the auth.\n    // Pull that off.\n    if (atSign !== -1) {\n      auth = rest.slice(0, atSign);\n      rest = rest.slice(atSign + 1);\n      this.auth = auth;\n    }\n\n    // the host is the remaining to the left of the first non-host char\n    hostEnd = -1;\n    for (i = 0; i < nonHostChars.length; i++) {\n      hec = rest.indexOf(nonHostChars[i]);\n      if (hec !== -1 && (hostEnd === -1 || hec < hostEnd)) {\n        hostEnd = hec;\n      }\n    }\n    // if we still have not hit it, then the entire thing is a host.\n    if (hostEnd === -1) {\n      hostEnd = rest.length;\n    }\n\n    if (rest[hostEnd - 1] === ':') { hostEnd--; }\n    var host = rest.slice(0, hostEnd);\n    rest = rest.slice(hostEnd);\n\n    // pull out port.\n    this.parseHost(host);\n\n    // we've indicated that there is a hostname,\n    // so even if it's empty, it has to be present.\n    this.hostname = this.hostname || '';\n\n    // if hostname begins with [ and ends with ]\n    // assume that it's an IPv6 address.\n    var ipv6Hostname = this.hostname[0] === '[' &&\n        this.hostname[this.hostname.length - 1] === ']';\n\n    // validate a little.\n    if (!ipv6Hostname) {\n      var hostparts = this.hostname.split(/\\./);\n      for (i = 0, l = hostparts.length; i < l; i++) {\n        var part = hostparts[i];\n        if (!part) { continue; }\n        if (!part.match(hostnamePartPattern)) {\n          var newpart = '';\n          for (var j = 0, k = part.length; j < k; j++) {\n            if (part.charCodeAt(j) > 127) {\n              // we replace non-ASCII char with a temporary placeholder\n              // we need this to make sure size of hostname is not\n              // broken by replacing non-ASCII by nothing\n              newpart += 'x';\n            } else {\n              newpart += part[j];\n            }\n          }\n          // we test again with ASCII char only\n          if (!newpart.match(hostnamePartPattern)) {\n            var validParts = hostparts.slice(0, i);\n            var notHost = hostparts.slice(i + 1);\n            var bit = part.match(hostnamePartStart);\n            if (bit) {\n              validParts.push(bit[1]);\n              notHost.unshift(bit[2]);\n            }\n            if (notHost.length) {\n              rest = notHost.join('.') + rest;\n            }\n            this.hostname = validParts.join('.');\n            break;\n          }\n        }\n      }\n    }\n\n    if (this.hostname.length > hostnameMaxLen) {\n      this.hostname = '';\n    }\n\n    // strip [ and ] from the hostname\n    // the host field still retains them, though\n    if (ipv6Hostname) {\n      this.hostname = this.hostname.substr(1, this.hostname.length - 2);\n    }\n  }\n\n  // chop off from the tail first.\n  var hash = rest.indexOf('#');\n  if (hash !== -1) {\n    // got a fragment string.\n    this.hash = rest.substr(hash);\n    rest = rest.slice(0, hash);\n  }\n  var qm = rest.indexOf('?');\n  if (qm !== -1) {\n    this.search = rest.substr(qm);\n    rest = rest.slice(0, qm);\n  }\n  if (rest) { this.pathname = rest; }\n  if (slashedProtocol[lowerProto] &&\n      this.hostname && !this.pathname) {\n    this.pathname = '';\n  }\n\n  return this;\n};\n\nUrl.prototype.parseHost = function(host) {\n  var port = portPattern.exec(host);\n  if (port) {\n    port = port[0];\n    if (port !== ':') {\n      this.port = port.substr(1);\n    }\n    host = host.substr(0, host.length - port.length);\n  }\n  if (host) { this.hostname = host; }\n};\n\nmodule.exports = urlParse;\n","'use strict';\n\nexports.Any = require('./properties/Any/regex');\nexports.Cc  = require('./categories/Cc/regex');\nexports.Cf  = require('./categories/Cf/regex');\nexports.P   = require('./categories/P/regex');\nexports.Z   = require('./categories/Z/regex');\n","module.exports=/[\\xAD\\u0600-\\u0605\\u061C\\u06DD\\u070F\\u08E2\\u180E\\u200B-\\u200F\\u202A-\\u202E\\u2060-\\u2064\\u2066-\\u206F\\uFEFF\\uFFF9-\\uFFFB]|\\uD804\\uDCBD|\\uD82F[\\uDCA0-\\uDCA3]|\\uD834[\\uDD73-\\uDD7A]|\\uDB40[\\uDC01\\uDC20-\\uDC7F]/","// Just a shortcut for bulk export\n'use strict';\n\n\nexports.parseLinkLabel       = require('./parse_link_label');\nexports.parseLinkDestination = require('./parse_link_destination');\nexports.parseLinkTitle       = require('./parse_link_title');\n","// Parse link label\n//\n// this function assumes that first character (\"[\") already matches;\n// returns the end of the label\n//\n'use strict';\n\nmodule.exports = function parseLinkLabel(state, start, disableNested) {\n  var level, found, marker, prevPos,\n      labelEnd = -1,\n      max = state.posMax,\n      oldPos = state.pos;\n\n  state.pos = start + 1;\n  level = 1;\n\n  while (state.pos < max) {\n    marker = state.src.charCodeAt(state.pos);\n    if (marker === 0x5D /* ] */) {\n      level--;\n      if (level === 0) {\n        found = true;\n        break;\n      }\n    }\n\n    prevPos = state.pos;\n    state.md.inline.skipToken(state);\n    if (marker === 0x5B /* [ */) {\n      if (prevPos === state.pos - 1) {\n        // increase level if we find text `[`, which is not a part of any token\n        level++;\n      } else if (disableNested) {\n        state.pos = oldPos;\n        return -1;\n      }\n    }\n  }\n\n  if (found) {\n    labelEnd = state.pos;\n  }\n\n  // restore old state\n  state.pos = oldPos;\n\n  return labelEnd;\n};\n","// Parse link destination\n//\n'use strict';\n\n\nvar isSpace     = require('../common/utils').isSpace;\nvar unescapeAll = require('../common/utils').unescapeAll;\n\n\nmodule.exports = function parseLinkDestination(str, pos, max) {\n  var code, level,\n      lines = 0,\n      start = pos,\n      result = {\n        ok: false,\n        pos: 0,\n        lines: 0,\n        str: ''\n      };\n\n  if (str.charCodeAt(pos) === 0x3C /* < */) {\n    pos++;\n    while (pos < max) {\n      code = str.charCodeAt(pos);\n      if (code === 0x0A /* \\n */ || isSpace(code)) { return result; }\n      if (code === 0x3E /* > */) {\n        result.pos = pos + 1;\n        result.str = unescapeAll(str.slice(start + 1, pos));\n        result.ok = true;\n        return result;\n      }\n      if (code === 0x5C /* \\ */ && pos + 1 < max) {\n        pos += 2;\n        continue;\n      }\n\n      pos++;\n    }\n\n    // no closing '>'\n    return result;\n  }\n\n  // this should be ... } else { ... branch\n\n  level = 0;\n  while (pos < max) {\n    code = str.charCodeAt(pos);\n\n    if (code === 0x20) { break; }\n\n    // ascii control characters\n    if (code < 0x20 || code === 0x7F) { break; }\n\n    if (code === 0x5C /* \\ */ && pos + 1 < max) {\n      pos += 2;\n      continue;\n    }\n\n    if (code === 0x28 /* ( */) {\n      level++;\n    }\n\n    if (code === 0x29 /* ) */) {\n      if (level === 0) { break; }\n      level--;\n    }\n\n    pos++;\n  }\n\n  if (start === pos) { return result; }\n  if (level !== 0) { return result; }\n\n  result.str = unescapeAll(str.slice(start, pos));\n  result.lines = lines;\n  result.pos = pos;\n  result.ok = true;\n  return result;\n};\n","// Parse link title\n//\n'use strict';\n\n\nvar unescapeAll = require('../common/utils').unescapeAll;\n\n\nmodule.exports = function parseLinkTitle(str, pos, max) {\n  var code,\n      marker,\n      lines = 0,\n      start = pos,\n      result = {\n        ok: false,\n        pos: 0,\n        lines: 0,\n        str: ''\n      };\n\n  if (pos >= max) { return result; }\n\n  marker = str.charCodeAt(pos);\n\n  if (marker !== 0x22 /* \" */ && marker !== 0x27 /* ' */ && marker !== 0x28 /* ( */) { return result; }\n\n  pos++;\n\n  // if opening marker is \"(\", switch it to closing marker \")\"\n  if (marker === 0x28) { marker = 0x29; }\n\n  while (pos < max) {\n    code = str.charCodeAt(pos);\n    if (code === marker) {\n      result.pos = pos + 1;\n      result.lines = lines;\n      result.str = unescapeAll(str.slice(start + 1, pos));\n      result.ok = true;\n      return result;\n    } else if (code === 0x0A) {\n      lines++;\n    } else if (code === 0x5C /* \\ */ && pos + 1 < max) {\n      pos++;\n      if (str.charCodeAt(pos) === 0x0A) {\n        lines++;\n      }\n    }\n\n    pos++;\n  }\n\n  return result;\n};\n","/**\n * class Renderer\n *\n * Generates HTML from parsed token stream. Each instance has independent\n * copy of rules. Those can be rewritten with ease. Also, you can add new\n * rules if you create plugin and adds new token types.\n **/\n'use strict';\n\n\nvar assign          = require('./common/utils').assign;\nvar unescapeAll     = require('./common/utils').unescapeAll;\nvar escapeHtml      = require('./common/utils').escapeHtml;\n\n\n////////////////////////////////////////////////////////////////////////////////\n\nvar default_rules = {};\n\n\ndefault_rules.code_inline = function (tokens, idx, options, env, slf) {\n  var token = tokens[idx];\n\n  return  '<code' + slf.renderAttrs(token) + '>' +\n          escapeHtml(tokens[idx].content) +\n          '</code>';\n};\n\n\ndefault_rules.code_block = function (tokens, idx, options, env, slf) {\n  var token = tokens[idx];\n\n  return  '<pre' + slf.renderAttrs(token) + '><code>' +\n          escapeHtml(tokens[idx].content) +\n          '</code></pre>\\n';\n};\n\n\ndefault_rules.fence = function (tokens, idx, options, env, slf) {\n  var token = tokens[idx],\n      info = token.info ? unescapeAll(token.info).trim() : '',\n      langName = '',\n      highlighted, i, tmpAttrs, tmpToken;\n\n  if (info) {\n    langName = info.split(/\\s+/g)[0];\n  }\n\n  if (options.highlight) {\n    highlighted = options.highlight(token.content, langName) || escapeHtml(token.content);\n  } else {\n    highlighted = escapeHtml(token.content);\n  }\n\n  if (highlighted.indexOf('<pre') === 0) {\n    return highlighted + '\\n';\n  }\n\n  // If language exists, inject class gently, without modifying original token.\n  // May be, one day we will add .clone() for token and simplify this part, but\n  // now we prefer to keep things local.\n  if (info) {\n    i        = token.attrIndex('class');\n    tmpAttrs = token.attrs ? token.attrs.slice() : [];\n\n    if (i < 0) {\n      tmpAttrs.push([ 'class', options.langPrefix + langName ]);\n    } else {\n      tmpAttrs[i][1] += ' ' + options.langPrefix + langName;\n    }\n\n    // Fake token just to render attributes\n    tmpToken = {\n      attrs: tmpAttrs\n    };\n\n    return  '<pre><code' + slf.renderAttrs(tmpToken) + '>'\n          + highlighted\n          + '</code></pre>\\n';\n  }\n\n\n  return  '<pre><code' + slf.renderAttrs(token) + '>'\n        + highlighted\n        + '</code></pre>\\n';\n};\n\n\ndefault_rules.image = function (tokens, idx, options, env, slf) {\n  var token = tokens[idx];\n\n  // \"alt\" attr MUST be set, even if empty. Because it's mandatory and\n  // should be placed on proper position for tests.\n  //\n  // Replace content with actual value\n\n  token.attrs[token.attrIndex('alt')][1] =\n    slf.renderInlineAsText(token.children, options, env);\n\n  return slf.renderToken(tokens, idx, options);\n};\n\n\ndefault_rules.hardbreak = function (tokens, idx, options /*, env */) {\n  return options.xhtmlOut ? '<br />\\n' : '<br>\\n';\n};\ndefault_rules.softbreak = function (tokens, idx, options /*, env */) {\n  return options.breaks ? (options.xhtmlOut ? '<br />\\n' : '<br>\\n') : '\\n';\n};\n\n\ndefault_rules.text = function (tokens, idx /*, options, env */) {\n  return escapeHtml(tokens[idx].content);\n};\n\n\ndefault_rules.html_block = function (tokens, idx /*, options, env */) {\n  return tokens[idx].content;\n};\ndefault_rules.html_inline = function (tokens, idx /*, options, env */) {\n  return tokens[idx].content;\n};\n\n\n/**\n * new Renderer()\n *\n * Creates new [[Renderer]] instance and fill [[Renderer#rules]] with defaults.\n **/\nfunction Renderer() {\n\n  /**\n   * Renderer#rules -> Object\n   *\n   * Contains render rules for tokens. Can be updated and extended.\n   *\n   * ##### Example\n   *\n   * ```javascript\n   * var md = require('markdown-it')();\n   *\n   * md.renderer.rules.strong_open  = function () { return '<b>'; };\n   * md.renderer.rules.strong_close = function () { return '</b>'; };\n   *\n   * var result = md.renderInline(...);\n   * ```\n   *\n   * Each rule is called as independent static function with fixed signature:\n   *\n   * ```javascript\n   * function my_token_render(tokens, idx, options, env, renderer) {\n   *   // ...\n   *   return renderedHTML;\n   * }\n   * ```\n   *\n   * See [source code](https://github.com/markdown-it/markdown-it/blob/master/lib/renderer.js)\n   * for more details and examples.\n   **/\n  this.rules = assign({}, default_rules);\n}\n\n\n/**\n * Renderer.renderAttrs(token) -> String\n *\n * Render token attributes to string.\n **/\nRenderer.prototype.renderAttrs = function renderAttrs(token) {\n  var i, l, result;\n\n  if (!token.attrs) { return ''; }\n\n  result = '';\n\n  for (i = 0, l = token.attrs.length; i < l; i++) {\n    result += ' ' + escapeHtml(token.attrs[i][0]) + '=\"' + escapeHtml(token.attrs[i][1]) + '\"';\n  }\n\n  return result;\n};\n\n\n/**\n * Renderer.renderToken(tokens, idx, options) -> String\n * - tokens (Array): list of tokens\n * - idx (Numbed): token index to render\n * - options (Object): params of parser instance\n *\n * Default token renderer. Can be overriden by custom function\n * in [[Renderer#rules]].\n **/\nRenderer.prototype.renderToken = function renderToken(tokens, idx, options) {\n  var nextToken,\n      result = '',\n      needLf = false,\n      token = tokens[idx];\n\n  // Tight list paragraphs\n  if (token.hidden) {\n    return '';\n  }\n\n  // Insert a newline between hidden paragraph and subsequent opening\n  // block-level tag.\n  //\n  // For example, here we should insert a newline before blockquote:\n  //  - a\n  //    >\n  //\n  if (token.block && token.nesting !== -1 && idx && tokens[idx - 1].hidden) {\n    result += '\\n';\n  }\n\n  // Add token name, e.g. `<img`\n  result += (token.nesting === -1 ? '</' : '<') + token.tag;\n\n  // Encode attributes, e.g. `<img src=\"foo\"`\n  result += this.renderAttrs(token);\n\n  // Add a slash for self-closing tags, e.g. `<img src=\"foo\" /`\n  if (token.nesting === 0 && options.xhtmlOut) {\n    result += ' /';\n  }\n\n  // Check if we need to add a newline after this tag\n  if (token.block) {\n    needLf = true;\n\n    if (token.nesting === 1) {\n      if (idx + 1 < tokens.length) {\n        nextToken = tokens[idx + 1];\n\n        if (nextToken.type === 'inline' || nextToken.hidden) {\n          // Block-level tag containing an inline tag.\n          //\n          needLf = false;\n\n        } else if (nextToken.nesting === -1 && nextToken.tag === token.tag) {\n          // Opening tag + closing tag of the same type. E.g. `<li></li>`.\n          //\n          needLf = false;\n        }\n      }\n    }\n  }\n\n  result += needLf ? '>\\n' : '>';\n\n  return result;\n};\n\n\n/**\n * Renderer.renderInline(tokens, options, env) -> String\n * - tokens (Array): list on block tokens to renter\n * - options (Object): params of parser instance\n * - env (Object): additional data from parsed input (references, for example)\n *\n * The same as [[Renderer.render]], but for single token of `inline` type.\n **/\nRenderer.prototype.renderInline = function (tokens, options, env) {\n  var type,\n      result = '',\n      rules = this.rules;\n\n  for (var i = 0, len = tokens.length; i < len; i++) {\n    type = tokens[i].type;\n\n    if (typeof rules[type] !== 'undefined') {\n      result += rules[type](tokens, i, options, env, this);\n    } else {\n      result += this.renderToken(tokens, i, options);\n    }\n  }\n\n  return result;\n};\n\n\n/** internal\n * Renderer.renderInlineAsText(tokens, options, env) -> String\n * - tokens (Array): list on block tokens to renter\n * - options (Object): params of parser instance\n * - env (Object): additional data from parsed input (references, for example)\n *\n * Special kludge for image `alt` attributes to conform CommonMark spec.\n * Don't try to use it! Spec requires to show `alt` content with stripped markup,\n * instead of simple escaping.\n **/\nRenderer.prototype.renderInlineAsText = function (tokens, options, env) {\n  var result = '';\n\n  for (var i = 0, len = tokens.length; i < len; i++) {\n    if (tokens[i].type === 'text') {\n      result += tokens[i].content;\n    } else if (tokens[i].type === 'image') {\n      result += this.renderInlineAsText(tokens[i].children, options, env);\n    }\n  }\n\n  return result;\n};\n\n\n/**\n * Renderer.render(tokens, options, env) -> String\n * - tokens (Array): list on block tokens to renter\n * - options (Object): params of parser instance\n * - env (Object): additional data from parsed input (references, for example)\n *\n * Takes token stream and generates HTML. Probably, you will never need to call\n * this method directly.\n **/\nRenderer.prototype.render = function (tokens, options, env) {\n  var i, len, type,\n      result = '',\n      rules = this.rules;\n\n  for (i = 0, len = tokens.length; i < len; i++) {\n    type = tokens[i].type;\n\n    if (type === 'inline') {\n      result += this.renderInline(tokens[i].children, options, env);\n    } else if (typeof rules[type] !== 'undefined') {\n      result += rules[tokens[i].type](tokens, i, options, env, this);\n    } else {\n      result += this.renderToken(tokens, i, options, env);\n    }\n  }\n\n  return result;\n};\n\nmodule.exports = Renderer;\n","/** internal\n * class Core\n *\n * Top-level rules executor. Glues block/inline parsers and does intermediate\n * transformations.\n **/\n'use strict';\n\n\nvar Ruler  = require('./ruler');\n\n\nvar _rules = [\n  [ 'normalize',      require('./rules_core/normalize')      ],\n  [ 'block',          require('./rules_core/block')          ],\n  [ 'inline',         require('./rules_core/inline')         ],\n  [ 'linkify',        require('./rules_core/linkify')        ],\n  [ 'replacements',   require('./rules_core/replacements')   ],\n  [ 'smartquotes',    require('./rules_core/smartquotes')    ]\n];\n\n\n/**\n * new Core()\n **/\nfunction Core() {\n  /**\n   * Core#ruler -> Ruler\n   *\n   * [[Ruler]] instance. Keep configuration of core rules.\n   **/\n  this.ruler = new Ruler();\n\n  for (var i = 0; i < _rules.length; i++) {\n    this.ruler.push(_rules[i][0], _rules[i][1]);\n  }\n}\n\n\n/**\n * Core.process(state)\n *\n * Executes core chain rules.\n **/\nCore.prototype.process = function (state) {\n  var i, l, rules;\n\n  rules = this.ruler.getRules('');\n\n  for (i = 0, l = rules.length; i < l; i++) {\n    rules[i](state);\n  }\n};\n\nCore.prototype.State = require('./rules_core/state_core');\n\n\nmodule.exports = Core;\n","// Normalize input string\n\n'use strict';\n\n\nvar NEWLINES_RE  = /\\r[\\n\\u0085]?|[\\u2424\\u2028\\u0085]/g;\nvar NULL_RE      = /\\u0000/g;\n\n\nmodule.exports = function inline(state) {\n  var str;\n\n  // Normalize newlines\n  str = state.src.replace(NEWLINES_RE, '\\n');\n\n  // Replace NULL characters\n  str = str.replace(NULL_RE, '\\uFFFD');\n\n  state.src = str;\n};\n","'use strict';\n\n\nmodule.exports = function block(state) {\n  var token;\n\n  if (state.inlineMode) {\n    token          = new state.Token('inline', '', 0);\n    token.content  = state.src;\n    token.map      = [ 0, 1 ];\n    token.children = [];\n    state.tokens.push(token);\n  } else {\n    state.md.block.parse(state.src, state.md, state.env, state.tokens);\n  }\n};\n","'use strict';\n\nmodule.exports = function inline(state) {\n  var tokens = state.tokens, tok, i, l;\n\n  // Parse inlines\n  for (i = 0, l = tokens.length; i < l; i++) {\n    tok = tokens[i];\n    if (tok.type === 'inline') {\n      state.md.inline.parse(tok.content, state.md, state.env, tok.children);\n    }\n  }\n};\n","// Replace link-like texts with link nodes.\n//\n// Currently restricted by `md.validateLink()` to http/https/ftp\n//\n'use strict';\n\n\nvar arrayReplaceAt = require('../common/utils').arrayReplaceAt;\n\n\nfunction isLinkOpen(str) {\n  return /^<a[>\\s]/i.test(str);\n}\nfunction isLinkClose(str) {\n  return /^<\\/a\\s*>/i.test(str);\n}\n\n\nmodule.exports = function linkify(state) {\n  var i, j, l, tokens, token, currentToken, nodes, ln, text, pos, lastPos,\n      level, htmlLinkLevel, url, fullUrl, urlText,\n      blockTokens = state.tokens,\n      links;\n\n  if (!state.md.options.linkify) { return; }\n\n  for (j = 0, l = blockTokens.length; j < l; j++) {\n    if (blockTokens[j].type !== 'inline' ||\n        !state.md.linkify.pretest(blockTokens[j].content)) {\n      continue;\n    }\n\n    tokens = blockTokens[j].children;\n\n    htmlLinkLevel = 0;\n\n    // We scan from the end, to keep position when new tags added.\n    // Use reversed logic in links start/end match\n    for (i = tokens.length - 1; i >= 0; i--) {\n      currentToken = tokens[i];\n\n      // Skip content of markdown links\n      if (currentToken.type === 'link_close') {\n        i--;\n        while (tokens[i].level !== currentToken.level && tokens[i].type !== 'link_open') {\n          i--;\n        }\n        continue;\n      }\n\n      // Skip content of html tag links\n      if (currentToken.type === 'html_inline') {\n        if (isLinkOpen(currentToken.content) && htmlLinkLevel > 0) {\n          htmlLinkLevel--;\n        }\n        if (isLinkClose(currentToken.content)) {\n          htmlLinkLevel++;\n        }\n      }\n      if (htmlLinkLevel > 0) { continue; }\n\n      if (currentToken.type === 'text' && state.md.linkify.test(currentToken.content)) {\n\n        text = currentToken.content;\n        links = state.md.linkify.match(text);\n\n        // Now split string to nodes\n        nodes = [];\n        level = currentToken.level;\n        lastPos = 0;\n\n        for (ln = 0; ln < links.length; ln++) {\n\n          url = links[ln].url;\n          fullUrl = state.md.normalizeLink(url);\n          if (!state.md.validateLink(fullUrl)) { continue; }\n\n          urlText = links[ln].text;\n\n          // Linkifier might send raw hostnames like \"example.com\", where url\n          // starts with domain name. So we prepend http:// in those cases,\n          // and remove it afterwards.\n          //\n          if (!links[ln].schema) {\n            urlText = state.md.normalizeLinkText('http://' + urlText).replace(/^http:\\/\\//, '');\n          } else if (links[ln].schema === 'mailto:' && !/^mailto:/i.test(urlText)) {\n            urlText = state.md.normalizeLinkText('mailto:' + urlText).replace(/^mailto:/, '');\n          } else {\n            urlText = state.md.normalizeLinkText(urlText);\n          }\n\n          pos = links[ln].index;\n\n          if (pos > lastPos) {\n            token         = new state.Token('text', '', 0);\n            token.content = text.slice(lastPos, pos);\n            token.level   = level;\n            nodes.push(token);\n          }\n\n          token         = new state.Token('link_open', 'a', 1);\n          token.attrs   = [ [ 'href', fullUrl ] ];\n          token.level   = level++;\n          token.markup  = 'linkify';\n          token.info    = 'auto';\n          nodes.push(token);\n\n          token         = new state.Token('text', '', 0);\n          token.content = urlText;\n          token.level   = level;\n          nodes.push(token);\n\n          token         = new state.Token('link_close', 'a', -1);\n          token.level   = --level;\n          token.markup  = 'linkify';\n          token.info    = 'auto';\n          nodes.push(token);\n\n          lastPos = links[ln].lastIndex;\n        }\n        if (lastPos < text.length) {\n          token         = new state.Token('text', '', 0);\n          token.content = text.slice(lastPos);\n          token.level   = level;\n          nodes.push(token);\n        }\n\n        // replace current node\n        blockTokens[j].children = tokens = arrayReplaceAt(tokens, i, nodes);\n      }\n    }\n  }\n};\n","// Simple typographyc replacements\n//\n// (c) (C) → ©\n// (tm) (TM) → ™\n// (r) (R) → ®\n// +- → ±\n// (p) (P) -> §\n// ... → … (also ?.... → ?.., !.... → !..)\n// ???????? → ???, !!!!! → !!!, `,,` → `,`\n// -- → &ndash;, --- → &mdash;\n//\n'use strict';\n\n// TODO:\n// - fractionals 1/2, 1/4, 3/4 -> ½, ¼, ¾\n// - miltiplication 2 x 4 -> 2 × 4\n\nvar RARE_RE = /\\+-|\\.\\.|\\?\\?\\?\\?|!!!!|,,|--/;\n\n// Workaround for phantomjs - need regex without /g flag,\n// or root check will fail every second time\nvar SCOPED_ABBR_TEST_RE = /\\((c|tm|r|p)\\)/i;\n\nvar SCOPED_ABBR_RE = /\\((c|tm|r|p)\\)/ig;\nvar SCOPED_ABBR = {\n  c: '©',\n  r: '®',\n  p: '§',\n  tm: '™'\n};\n\nfunction replaceFn(match, name) {\n  return SCOPED_ABBR[name.toLowerCase()];\n}\n\nfunction replace_scoped(inlineTokens) {\n  var i, token, inside_autolink = 0;\n\n  for (i = inlineTokens.length - 1; i >= 0; i--) {\n    token = inlineTokens[i];\n\n    if (token.type === 'text' && !inside_autolink) {\n      token.content = token.content.replace(SCOPED_ABBR_RE, replaceFn);\n    }\n\n    if (token.type === 'link_open' && token.info === 'auto') {\n      inside_autolink--;\n    }\n\n    if (token.type === 'link_close' && token.info === 'auto') {\n      inside_autolink++;\n    }\n  }\n}\n\nfunction replace_rare(inlineTokens) {\n  var i, token, inside_autolink = 0;\n\n  for (i = inlineTokens.length - 1; i >= 0; i--) {\n    token = inlineTokens[i];\n\n    if (token.type === 'text' && !inside_autolink) {\n      if (RARE_RE.test(token.content)) {\n        token.content = token.content\n                    .replace(/\\+-/g, '±')\n                    // .., ..., ....... -> …\n                    // but ?..... & !..... -> ?.. & !..\n                    .replace(/\\.{2,}/g, '…').replace(/([?!])…/g, '$1..')\n                    .replace(/([?!]){4,}/g, '$1$1$1').replace(/,{2,}/g, ',')\n                    // em-dash\n                    .replace(/(^|[^-])---([^-]|$)/mg, '$1\\u2014$2')\n                    // en-dash\n                    .replace(/(^|\\s)--(\\s|$)/mg, '$1\\u2013$2')\n                    .replace(/(^|[^-\\s])--([^-\\s]|$)/mg, '$1\\u2013$2');\n      }\n    }\n\n    if (token.type === 'link_open' && token.info === 'auto') {\n      inside_autolink--;\n    }\n\n    if (token.type === 'link_close' && token.info === 'auto') {\n      inside_autolink++;\n    }\n  }\n}\n\n\nmodule.exports = function replace(state) {\n  var blkIdx;\n\n  if (!state.md.options.typographer) { return; }\n\n  for (blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {\n\n    if (state.tokens[blkIdx].type !== 'inline') { continue; }\n\n    if (SCOPED_ABBR_TEST_RE.test(state.tokens[blkIdx].content)) {\n      replace_scoped(state.tokens[blkIdx].children);\n    }\n\n    if (RARE_RE.test(state.tokens[blkIdx].content)) {\n      replace_rare(state.tokens[blkIdx].children);\n    }\n\n  }\n};\n","// Convert straight quotation marks to typographic ones\n//\n'use strict';\n\n\nvar isWhiteSpace   = require('../common/utils').isWhiteSpace;\nvar isPunctChar    = require('../common/utils').isPunctChar;\nvar isMdAsciiPunct = require('../common/utils').isMdAsciiPunct;\n\nvar QUOTE_TEST_RE = /['\"]/;\nvar QUOTE_RE = /['\"]/g;\nvar APOSTROPHE = '\\u2019'; /* ’ */\n\n\nfunction replaceAt(str, index, ch) {\n  return str.substr(0, index) + ch + str.substr(index + 1);\n}\n\nfunction process_inlines(tokens, state) {\n  var i, token, text, t, pos, max, thisLevel, item, lastChar, nextChar,\n      isLastPunctChar, isNextPunctChar, isLastWhiteSpace, isNextWhiteSpace,\n      canOpen, canClose, j, isSingle, stack, openQuote, closeQuote;\n\n  stack = [];\n\n  for (i = 0; i < tokens.length; i++) {\n    token = tokens[i];\n\n    thisLevel = tokens[i].level;\n\n    for (j = stack.length - 1; j >= 0; j--) {\n      if (stack[j].level <= thisLevel) { break; }\n    }\n    stack.length = j + 1;\n\n    if (token.type !== 'text') { continue; }\n\n    text = token.content;\n    pos = 0;\n    max = text.length;\n\n    /*eslint no-labels:0,block-scoped-var:0*/\n    OUTER:\n    while (pos < max) {\n      QUOTE_RE.lastIndex = pos;\n      t = QUOTE_RE.exec(text);\n      if (!t) { break; }\n\n      canOpen = canClose = true;\n      pos = t.index + 1;\n      isSingle = (t[0] === \"'\");\n\n      // Find previous character,\n      // default to space if it's the beginning of the line\n      //\n      lastChar = 0x20;\n\n      if (t.index - 1 >= 0) {\n        lastChar = text.charCodeAt(t.index - 1);\n      } else {\n        for (j = i - 1; j >= 0; j--) {\n          if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break; // lastChar defaults to 0x20\n          if (tokens[j].type !== 'text') continue;\n\n          lastChar = tokens[j].content.charCodeAt(tokens[j].content.length - 1);\n          break;\n        }\n      }\n\n      // Find next character,\n      // default to space if it's the end of the line\n      //\n      nextChar = 0x20;\n\n      if (pos < max) {\n        nextChar = text.charCodeAt(pos);\n      } else {\n        for (j = i + 1; j < tokens.length; j++) {\n          if (tokens[j].type === 'softbreak' || tokens[j].type === 'hardbreak') break; // nextChar defaults to 0x20\n          if (tokens[j].type !== 'text') continue;\n\n          nextChar = tokens[j].content.charCodeAt(0);\n          break;\n        }\n      }\n\n      isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar));\n      isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar));\n\n      isLastWhiteSpace = isWhiteSpace(lastChar);\n      isNextWhiteSpace = isWhiteSpace(nextChar);\n\n      if (isNextWhiteSpace) {\n        canOpen = false;\n      } else if (isNextPunctChar) {\n        if (!(isLastWhiteSpace || isLastPunctChar)) {\n          canOpen = false;\n        }\n      }\n\n      if (isLastWhiteSpace) {\n        canClose = false;\n      } else if (isLastPunctChar) {\n        if (!(isNextWhiteSpace || isNextPunctChar)) {\n          canClose = false;\n        }\n      }\n\n      if (nextChar === 0x22 /* \" */ && t[0] === '\"') {\n        if (lastChar >= 0x30 /* 0 */ && lastChar <= 0x39 /* 9 */) {\n          // special case: 1\"\" - count first quote as an inch\n          canClose = canOpen = false;\n        }\n      }\n\n      if (canOpen && canClose) {\n        // treat this as the middle of the word\n        canOpen = false;\n        canClose = isNextPunctChar;\n      }\n\n      if (!canOpen && !canClose) {\n        // middle of word\n        if (isSingle) {\n          token.content = replaceAt(token.content, t.index, APOSTROPHE);\n        }\n        continue;\n      }\n\n      if (canClose) {\n        // this could be a closing quote, rewind the stack to get a match\n        for (j = stack.length - 1; j >= 0; j--) {\n          item = stack[j];\n          if (stack[j].level < thisLevel) { break; }\n          if (item.single === isSingle && stack[j].level === thisLevel) {\n            item = stack[j];\n\n            if (isSingle) {\n              openQuote = state.md.options.quotes[2];\n              closeQuote = state.md.options.quotes[3];\n            } else {\n              openQuote = state.md.options.quotes[0];\n              closeQuote = state.md.options.quotes[1];\n            }\n\n            // replace token.content *before* tokens[item.token].content,\n            // because, if they are pointing at the same token, replaceAt\n            // could mess up indices when quote length != 1\n            token.content = replaceAt(token.content, t.index, closeQuote);\n            tokens[item.token].content = replaceAt(\n              tokens[item.token].content, item.pos, openQuote);\n\n            pos += closeQuote.length - 1;\n            if (item.token === i) { pos += openQuote.length - 1; }\n\n            text = token.content;\n            max = text.length;\n\n            stack.length = j;\n            continue OUTER;\n          }\n        }\n      }\n\n      if (canOpen) {\n        stack.push({\n          token: i,\n          pos: t.index,\n          single: isSingle,\n          level: thisLevel\n        });\n      } else if (canClose && isSingle) {\n        token.content = replaceAt(token.content, t.index, APOSTROPHE);\n      }\n    }\n  }\n}\n\n\nmodule.exports = function smartquotes(state) {\n  /*eslint max-depth:0*/\n  var blkIdx;\n\n  if (!state.md.options.typographer) { return; }\n\n  for (blkIdx = state.tokens.length - 1; blkIdx >= 0; blkIdx--) {\n\n    if (state.tokens[blkIdx].type !== 'inline' ||\n        !QUOTE_TEST_RE.test(state.tokens[blkIdx].content)) {\n      continue;\n    }\n\n    process_inlines(state.tokens[blkIdx].children, state);\n  }\n};\n","// Core state object\n//\n'use strict';\n\nvar Token = require('../token');\n\n\nfunction StateCore(src, md, env) {\n  this.src = src;\n  this.env = env;\n  this.tokens = [];\n  this.inlineMode = false;\n  this.md = md; // link to parser instance\n}\n\n// re-export Token class to use in core rules\nStateCore.prototype.Token = Token;\n\n\nmodule.exports = StateCore;\n","/** internal\n * class ParserBlock\n *\n * Block-level tokenizer.\n **/\n'use strict';\n\n\nvar Ruler           = require('./ruler');\n\n\nvar _rules = [\n  // First 2 params - rule name & source. Secondary array - list of rules,\n  // which can be terminated by this one.\n  [ 'table',      require('./rules_block/table'),      [ 'paragraph', 'reference' ] ],\n  [ 'code',       require('./rules_block/code') ],\n  [ 'fence',      require('./rules_block/fence'),      [ 'paragraph', 'reference', 'blockquote', 'list' ] ],\n  [ 'blockquote', require('./rules_block/blockquote'), [ 'paragraph', 'reference', 'blockquote', 'list' ] ],\n  [ 'hr',         require('./rules_block/hr'),         [ 'paragraph', 'reference', 'blockquote', 'list' ] ],\n  [ 'list',       require('./rules_block/list'),       [ 'paragraph', 'reference', 'blockquote' ] ],\n  [ 'reference',  require('./rules_block/reference') ],\n  [ 'heading',    require('./rules_block/heading'),    [ 'paragraph', 'reference', 'blockquote' ] ],\n  [ 'lheading',   require('./rules_block/lheading') ],\n  [ 'html_block', require('./rules_block/html_block'), [ 'paragraph', 'reference', 'blockquote' ] ],\n  [ 'paragraph',  require('./rules_block/paragraph') ]\n];\n\n\n/**\n * new ParserBlock()\n **/\nfunction ParserBlock() {\n  /**\n   * ParserBlock#ruler -> Ruler\n   *\n   * [[Ruler]] instance. Keep configuration of block rules.\n   **/\n  this.ruler = new Ruler();\n\n  for (var i = 0; i < _rules.length; i++) {\n    this.ruler.push(_rules[i][0], _rules[i][1], { alt: (_rules[i][2] || []).slice() });\n  }\n}\n\n\n// Generate tokens for input range\n//\nParserBlock.prototype.tokenize = function (state, startLine, endLine) {\n  var ok, i,\n      rules = this.ruler.getRules(''),\n      len = rules.length,\n      line = startLine,\n      hasEmptyLines = false,\n      maxNesting = state.md.options.maxNesting;\n\n  while (line < endLine) {\n    state.line = line = state.skipEmptyLines(line);\n    if (line >= endLine) { break; }\n\n    // Termination condition for nested calls.\n    // Nested calls currently used for blockquotes & lists\n    if (state.sCount[line] < state.blkIndent) { break; }\n\n    // If nesting level exceeded - skip tail to the end. That's not ordinary\n    // situation and we should not care about content.\n    if (state.level >= maxNesting) {\n      state.line = endLine;\n      break;\n    }\n\n    // Try all possible rules.\n    // On success, rule should:\n    //\n    // - update `state.line`\n    // - update `state.tokens`\n    // - return true\n\n    for (i = 0; i < len; i++) {\n      ok = rules[i](state, line, endLine, false);\n      if (ok) { break; }\n    }\n\n    // set state.tight if we had an empty line before current tag\n    // i.e. latest empty line should not count\n    state.tight = !hasEmptyLines;\n\n    // paragraph might \"eat\" one newline after it in nested lists\n    if (state.isEmpty(state.line - 1)) {\n      hasEmptyLines = true;\n    }\n\n    line = state.line;\n\n    if (line < endLine && state.isEmpty(line)) {\n      hasEmptyLines = true;\n      line++;\n      state.line = line;\n    }\n  }\n};\n\n\n/**\n * ParserBlock.parse(str, md, env, outTokens)\n *\n * Process input string and push block tokens into `outTokens`\n **/\nParserBlock.prototype.parse = function (src, md, env, outTokens) {\n  var state;\n\n  if (!src) { return; }\n\n  state = new this.State(src, md, env, outTokens);\n\n  this.tokenize(state, state.line, state.lineMax);\n};\n\n\nParserBlock.prototype.State = require('./rules_block/state_block');\n\n\nmodule.exports = ParserBlock;\n","// GFM table, non-standard\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\nfunction getLine(state, line) {\n  var pos = state.bMarks[line] + state.blkIndent,\n      max = state.eMarks[line];\n\n  return state.src.substr(pos, max - pos);\n}\n\nfunction escapedSplit(str) {\n  var result = [],\n      pos = 0,\n      max = str.length,\n      ch,\n      escapes = 0,\n      lastPos = 0,\n      backTicked = false,\n      lastBackTick = 0;\n\n  ch  = str.charCodeAt(pos);\n\n  while (pos < max) {\n    if (ch === 0x60/* ` */) {\n      if (backTicked) {\n        // make \\` close code sequence, but not open it;\n        // the reason is: `\\` is correct code block\n        backTicked = false;\n        lastBackTick = pos;\n      } else if (escapes % 2 === 0) {\n        backTicked = true;\n        lastBackTick = pos;\n      }\n    } else if (ch === 0x7c/* | */ && (escapes % 2 === 0) && !backTicked) {\n      result.push(str.substring(lastPos, pos));\n      lastPos = pos + 1;\n    }\n\n    if (ch === 0x5c/* \\ */) {\n      escapes++;\n    } else {\n      escapes = 0;\n    }\n\n    pos++;\n\n    // If there was an un-closed backtick, go back to just after\n    // the last backtick, but as if it was a normal character\n    if (pos === max && backTicked) {\n      backTicked = false;\n      pos = lastBackTick + 1;\n    }\n\n    ch = str.charCodeAt(pos);\n  }\n\n  result.push(str.substring(lastPos));\n\n  return result;\n}\n\n\nmodule.exports = function table(state, startLine, endLine, silent) {\n  var ch, lineText, pos, i, nextLine, columns, columnCount, token,\n      aligns, t, tableLines, tbodyLines;\n\n  // should have at least two lines\n  if (startLine + 2 > endLine) { return false; }\n\n  nextLine = startLine + 1;\n\n  if (state.sCount[nextLine] < state.blkIndent) { return false; }\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[nextLine] - state.blkIndent >= 4) { return false; }\n\n  // first character of the second line should be '|', '-', ':',\n  // and no other characters are allowed but spaces;\n  // basically, this is the equivalent of /^[-:|][-:|\\s]*$/ regexp\n\n  pos = state.bMarks[nextLine] + state.tShift[nextLine];\n  if (pos >= state.eMarks[nextLine]) { return false; }\n\n  ch = state.src.charCodeAt(pos++);\n  if (ch !== 0x7C/* | */ && ch !== 0x2D/* - */ && ch !== 0x3A/* : */) { return false; }\n\n  while (pos < state.eMarks[nextLine]) {\n    ch = state.src.charCodeAt(pos);\n\n    if (ch !== 0x7C/* | */ && ch !== 0x2D/* - */ && ch !== 0x3A/* : */ && !isSpace(ch)) { return false; }\n\n    pos++;\n  }\n\n  lineText = getLine(state, startLine + 1);\n\n  columns = lineText.split('|');\n  aligns = [];\n  for (i = 0; i < columns.length; i++) {\n    t = columns[i].trim();\n    if (!t) {\n      // allow empty columns before and after table, but not in between columns;\n      // e.g. allow ` |---| `, disallow ` ---||--- `\n      if (i === 0 || i === columns.length - 1) {\n        continue;\n      } else {\n        return false;\n      }\n    }\n\n    if (!/^:?-+:?$/.test(t)) { return false; }\n    if (t.charCodeAt(t.length - 1) === 0x3A/* : */) {\n      aligns.push(t.charCodeAt(0) === 0x3A/* : */ ? 'center' : 'right');\n    } else if (t.charCodeAt(0) === 0x3A/* : */) {\n      aligns.push('left');\n    } else {\n      aligns.push('');\n    }\n  }\n\n  lineText = getLine(state, startLine).trim();\n  if (lineText.indexOf('|') === -1) { return false; }\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n  columns = escapedSplit(lineText.replace(/^\\||\\|$/g, ''));\n\n  // header row will define an amount of columns in the entire table,\n  // and align row shouldn't be smaller than that (the rest of the rows can)\n  columnCount = columns.length;\n  if (columnCount > aligns.length) { return false; }\n\n  if (silent) { return true; }\n\n  token     = state.push('table_open', 'table', 1);\n  token.map = tableLines = [ startLine, 0 ];\n\n  token     = state.push('thead_open', 'thead', 1);\n  token.map = [ startLine, startLine + 1 ];\n\n  token     = state.push('tr_open', 'tr', 1);\n  token.map = [ startLine, startLine + 1 ];\n\n  for (i = 0; i < columns.length; i++) {\n    token          = state.push('th_open', 'th', 1);\n    token.map      = [ startLine, startLine + 1 ];\n    if (aligns[i]) {\n      token.attrs  = [ [ 'style', 'text-align:' + aligns[i] ] ];\n    }\n\n    token          = state.push('inline', '', 0);\n    token.content  = columns[i].trim();\n    token.map      = [ startLine, startLine + 1 ];\n    token.children = [];\n\n    token          = state.push('th_close', 'th', -1);\n  }\n\n  token     = state.push('tr_close', 'tr', -1);\n  token     = state.push('thead_close', 'thead', -1);\n\n  token     = state.push('tbody_open', 'tbody', 1);\n  token.map = tbodyLines = [ startLine + 2, 0 ];\n\n  for (nextLine = startLine + 2; nextLine < endLine; nextLine++) {\n    if (state.sCount[nextLine] < state.blkIndent) { break; }\n\n    lineText = getLine(state, nextLine).trim();\n    if (lineText.indexOf('|') === -1) { break; }\n    if (state.sCount[nextLine] - state.blkIndent >= 4) { break; }\n    columns = escapedSplit(lineText.replace(/^\\||\\|$/g, ''));\n\n    token = state.push('tr_open', 'tr', 1);\n    for (i = 0; i < columnCount; i++) {\n      token          = state.push('td_open', 'td', 1);\n      if (aligns[i]) {\n        token.attrs  = [ [ 'style', 'text-align:' + aligns[i] ] ];\n      }\n\n      token          = state.push('inline', '', 0);\n      token.content  = columns[i] ? columns[i].trim() : '';\n      token.children = [];\n\n      token          = state.push('td_close', 'td', -1);\n    }\n    token = state.push('tr_close', 'tr', -1);\n  }\n  token = state.push('tbody_close', 'tbody', -1);\n  token = state.push('table_close', 'table', -1);\n\n  tableLines[1] = tbodyLines[1] = nextLine;\n  state.line = nextLine;\n  return true;\n};\n","// Code block (4 spaces padded)\n\n'use strict';\n\n\nmodule.exports = function code(state, startLine, endLine/*, silent*/) {\n  var nextLine, last, token;\n\n  if (state.sCount[startLine] - state.blkIndent < 4) { return false; }\n\n  last = nextLine = startLine + 1;\n\n  while (nextLine < endLine) {\n    if (state.isEmpty(nextLine)) {\n      nextLine++;\n      continue;\n    }\n\n    if (state.sCount[nextLine] - state.blkIndent >= 4) {\n      nextLine++;\n      last = nextLine;\n      continue;\n    }\n    break;\n  }\n\n  state.line = last;\n\n  token         = state.push('code_block', 'code', 0);\n  token.content = state.getLines(startLine, last, 4 + state.blkIndent, true);\n  token.map     = [ startLine, state.line ];\n\n  return true;\n};\n","// fences (``` lang, ~~~ lang)\n\n'use strict';\n\n\nmodule.exports = function fence(state, startLine, endLine, silent) {\n  var marker, len, params, nextLine, mem, token, markup,\n      haveEndMarker = false,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine];\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  if (pos + 3 > max) { return false; }\n\n  marker = state.src.charCodeAt(pos);\n\n  if (marker !== 0x7E/* ~ */ && marker !== 0x60 /* ` */) {\n    return false;\n  }\n\n  // scan marker length\n  mem = pos;\n  pos = state.skipChars(pos, marker);\n\n  len = pos - mem;\n\n  if (len < 3) { return false; }\n\n  markup = state.src.slice(mem, pos);\n  params = state.src.slice(pos, max);\n\n  if (params.indexOf(String.fromCharCode(marker)) >= 0) { return false; }\n\n  // Since start is found, we can report success here in validation mode\n  if (silent) { return true; }\n\n  // search end of block\n  nextLine = startLine;\n\n  for (;;) {\n    nextLine++;\n    if (nextLine >= endLine) {\n      // unclosed block should be autoclosed by end of document.\n      // also block seems to be autoclosed by end of parent\n      break;\n    }\n\n    pos = mem = state.bMarks[nextLine] + state.tShift[nextLine];\n    max = state.eMarks[nextLine];\n\n    if (pos < max && state.sCount[nextLine] < state.blkIndent) {\n      // non-empty line with negative indent should stop the list:\n      // - ```\n      //  test\n      break;\n    }\n\n    if (state.src.charCodeAt(pos) !== marker) { continue; }\n\n    if (state.sCount[nextLine] - state.blkIndent >= 4) {\n      // closing fence should be indented less than 4 spaces\n      continue;\n    }\n\n    pos = state.skipChars(pos, marker);\n\n    // closing code fence must be at least as long as the opening one\n    if (pos - mem < len) { continue; }\n\n    // make sure tail has spaces only\n    pos = state.skipSpaces(pos);\n\n    if (pos < max) { continue; }\n\n    haveEndMarker = true;\n    // found!\n    break;\n  }\n\n  // If a fence has heading spaces, they should be removed from its inner block\n  len = state.sCount[startLine];\n\n  state.line = nextLine + (haveEndMarker ? 1 : 0);\n\n  token         = state.push('fence', 'code', 0);\n  token.info    = params;\n  token.content = state.getLines(startLine + 1, nextLine, len, true);\n  token.markup  = markup;\n  token.map     = [ startLine, state.line ];\n\n  return true;\n};\n","// Block quotes\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\nmodule.exports = function blockquote(state, startLine, endLine, silent) {\n  var adjustTab,\n      ch,\n      i,\n      initial,\n      l,\n      lastLineEmpty,\n      lines,\n      nextLine,\n      offset,\n      oldBMarks,\n      oldBSCount,\n      oldIndent,\n      oldParentType,\n      oldSCount,\n      oldTShift,\n      spaceAfterMarker,\n      terminate,\n      terminatorRules,\n      token,\n      wasOutdented,\n      oldLineMax = state.lineMax,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine];\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  // check the block quote marker\n  if (state.src.charCodeAt(pos++) !== 0x3E/* > */) { return false; }\n\n  // we know that it's going to be a valid blockquote,\n  // so no point trying to find the end of it in silent mode\n  if (silent) { return true; }\n\n  // skip spaces after \">\" and re-calculate offset\n  initial = offset = state.sCount[startLine] + pos - (state.bMarks[startLine] + state.tShift[startLine]);\n\n  // skip one optional space after '>'\n  if (state.src.charCodeAt(pos) === 0x20 /* space */) {\n    // ' >   test '\n    //     ^ -- position start of line here:\n    pos++;\n    initial++;\n    offset++;\n    adjustTab = false;\n    spaceAfterMarker = true;\n  } else if (state.src.charCodeAt(pos) === 0x09 /* tab */) {\n    spaceAfterMarker = true;\n\n    if ((state.bsCount[startLine] + offset) % 4 === 3) {\n      // '  >\\t  test '\n      //       ^ -- position start of line here (tab has width===1)\n      pos++;\n      initial++;\n      offset++;\n      adjustTab = false;\n    } else {\n      // ' >\\t  test '\n      //    ^ -- position start of line here + shift bsCount slightly\n      //         to make extra space appear\n      adjustTab = true;\n    }\n  } else {\n    spaceAfterMarker = false;\n  }\n\n  oldBMarks = [ state.bMarks[startLine] ];\n  state.bMarks[startLine] = pos;\n\n  while (pos < max) {\n    ch = state.src.charCodeAt(pos);\n\n    if (isSpace(ch)) {\n      if (ch === 0x09) {\n        offset += 4 - (offset + state.bsCount[startLine] + (adjustTab ? 1 : 0)) % 4;\n      } else {\n        offset++;\n      }\n    } else {\n      break;\n    }\n\n    pos++;\n  }\n\n  oldBSCount = [ state.bsCount[startLine] ];\n  state.bsCount[startLine] = state.sCount[startLine] + 1 + (spaceAfterMarker ? 1 : 0);\n\n  lastLineEmpty = pos >= max;\n\n  oldSCount = [ state.sCount[startLine] ];\n  state.sCount[startLine] = offset - initial;\n\n  oldTShift = [ state.tShift[startLine] ];\n  state.tShift[startLine] = pos - state.bMarks[startLine];\n\n  terminatorRules = state.md.block.ruler.getRules('blockquote');\n\n  oldParentType = state.parentType;\n  state.parentType = 'blockquote';\n  wasOutdented = false;\n\n  // Search the end of the block\n  //\n  // Block ends with either:\n  //  1. an empty line outside:\n  //     ```\n  //     > test\n  //\n  //     ```\n  //  2. an empty line inside:\n  //     ```\n  //     >\n  //     test\n  //     ```\n  //  3. another tag:\n  //     ```\n  //     > test\n  //      - - -\n  //     ```\n  for (nextLine = startLine + 1; nextLine < endLine; nextLine++) {\n    // check if it's outdented, i.e. it's inside list item and indented\n    // less than said list item:\n    //\n    // ```\n    // 1. anything\n    //    > current blockquote\n    // 2. checking this line\n    // ```\n    if (state.sCount[nextLine] < state.blkIndent) wasOutdented = true;\n\n    pos = state.bMarks[nextLine] + state.tShift[nextLine];\n    max = state.eMarks[nextLine];\n\n    if (pos >= max) {\n      // Case 1: line is not inside the blockquote, and this line is empty.\n      break;\n    }\n\n    if (state.src.charCodeAt(pos++) === 0x3E/* > */ && !wasOutdented) {\n      // This line is inside the blockquote.\n\n      // skip spaces after \">\" and re-calculate offset\n      initial = offset = state.sCount[nextLine] + pos - (state.bMarks[nextLine] + state.tShift[nextLine]);\n\n      // skip one optional space after '>'\n      if (state.src.charCodeAt(pos) === 0x20 /* space */) {\n        // ' >   test '\n        //     ^ -- position start of line here:\n        pos++;\n        initial++;\n        offset++;\n        adjustTab = false;\n        spaceAfterMarker = true;\n      } else if (state.src.charCodeAt(pos) === 0x09 /* tab */) {\n        spaceAfterMarker = true;\n\n        if ((state.bsCount[nextLine] + offset) % 4 === 3) {\n          // '  >\\t  test '\n          //       ^ -- position start of line here (tab has width===1)\n          pos++;\n          initial++;\n          offset++;\n          adjustTab = false;\n        } else {\n          // ' >\\t  test '\n          //    ^ -- position start of line here + shift bsCount slightly\n          //         to make extra space appear\n          adjustTab = true;\n        }\n      } else {\n        spaceAfterMarker = false;\n      }\n\n      oldBMarks.push(state.bMarks[nextLine]);\n      state.bMarks[nextLine] = pos;\n\n      while (pos < max) {\n        ch = state.src.charCodeAt(pos);\n\n        if (isSpace(ch)) {\n          if (ch === 0x09) {\n            offset += 4 - (offset + state.bsCount[nextLine] + (adjustTab ? 1 : 0)) % 4;\n          } else {\n            offset++;\n          }\n        } else {\n          break;\n        }\n\n        pos++;\n      }\n\n      lastLineEmpty = pos >= max;\n\n      oldBSCount.push(state.bsCount[nextLine]);\n      state.bsCount[nextLine] = state.sCount[nextLine] + 1 + (spaceAfterMarker ? 1 : 0);\n\n      oldSCount.push(state.sCount[nextLine]);\n      state.sCount[nextLine] = offset - initial;\n\n      oldTShift.push(state.tShift[nextLine]);\n      state.tShift[nextLine] = pos - state.bMarks[nextLine];\n      continue;\n    }\n\n    // Case 2: line is not inside the blockquote, and the last line was empty.\n    if (lastLineEmpty) { break; }\n\n    // Case 3: another tag found.\n    terminate = false;\n    for (i = 0, l = terminatorRules.length; i < l; i++) {\n      if (terminatorRules[i](state, nextLine, endLine, true)) {\n        terminate = true;\n        break;\n      }\n    }\n\n    if (terminate) {\n      // Quirk to enforce \"hard termination mode\" for paragraphs;\n      // normally if you call `tokenize(state, startLine, nextLine)`,\n      // paragraphs will look below nextLine for paragraph continuation,\n      // but if blockquote is terminated by another tag, they shouldn't\n      state.lineMax = nextLine;\n\n      if (state.blkIndent !== 0) {\n        // state.blkIndent was non-zero, we now set it to zero,\n        // so we need to re-calculate all offsets to appear as\n        // if indent wasn't changed\n        oldBMarks.push(state.bMarks[nextLine]);\n        oldBSCount.push(state.bsCount[nextLine]);\n        oldTShift.push(state.tShift[nextLine]);\n        oldSCount.push(state.sCount[nextLine]);\n        state.sCount[nextLine] -= state.blkIndent;\n      }\n\n      break;\n    }\n\n    oldBMarks.push(state.bMarks[nextLine]);\n    oldBSCount.push(state.bsCount[nextLine]);\n    oldTShift.push(state.tShift[nextLine]);\n    oldSCount.push(state.sCount[nextLine]);\n\n    // A negative indentation means that this is a paragraph continuation\n    //\n    state.sCount[nextLine] = -1;\n  }\n\n  oldIndent = state.blkIndent;\n  state.blkIndent = 0;\n\n  token        = state.push('blockquote_open', 'blockquote', 1);\n  token.markup = '>';\n  token.map    = lines = [ startLine, 0 ];\n\n  state.md.block.tokenize(state, startLine, nextLine);\n\n  token        = state.push('blockquote_close', 'blockquote', -1);\n  token.markup = '>';\n\n  state.lineMax = oldLineMax;\n  state.parentType = oldParentType;\n  lines[1] = state.line;\n\n  // Restore original tShift; this might not be necessary since the parser\n  // has already been here, but just to make sure we can do that.\n  for (i = 0; i < oldTShift.length; i++) {\n    state.bMarks[i + startLine] = oldBMarks[i];\n    state.tShift[i + startLine] = oldTShift[i];\n    state.sCount[i + startLine] = oldSCount[i];\n    state.bsCount[i + startLine] = oldBSCount[i];\n  }\n  state.blkIndent = oldIndent;\n\n  return true;\n};\n","// Horizontal rule\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\nmodule.exports = function hr(state, startLine, endLine, silent) {\n  var marker, cnt, ch, token,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine];\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  marker = state.src.charCodeAt(pos++);\n\n  // Check hr marker\n  if (marker !== 0x2A/* * */ &&\n      marker !== 0x2D/* - */ &&\n      marker !== 0x5F/* _ */) {\n    return false;\n  }\n\n  // markers can be mixed with spaces, but there should be at least 3 of them\n\n  cnt = 1;\n  while (pos < max) {\n    ch = state.src.charCodeAt(pos++);\n    if (ch !== marker && !isSpace(ch)) { return false; }\n    if (ch === marker) { cnt++; }\n  }\n\n  if (cnt < 3) { return false; }\n\n  if (silent) { return true; }\n\n  state.line = startLine + 1;\n\n  token        = state.push('hr', 'hr', 0);\n  token.map    = [ startLine, state.line ];\n  token.markup = Array(cnt + 1).join(String.fromCharCode(marker));\n\n  return true;\n};\n","// Lists\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\n// Search `[-+*][\\n ]`, returns next pos after marker on success\n// or -1 on fail.\nfunction skipBulletListMarker(state, startLine) {\n  var marker, pos, max, ch;\n\n  pos = state.bMarks[startLine] + state.tShift[startLine];\n  max = state.eMarks[startLine];\n\n  marker = state.src.charCodeAt(pos++);\n  // Check bullet\n  if (marker !== 0x2A/* * */ &&\n      marker !== 0x2D/* - */ &&\n      marker !== 0x2B/* + */) {\n    return -1;\n  }\n\n  if (pos < max) {\n    ch = state.src.charCodeAt(pos);\n\n    if (!isSpace(ch)) {\n      // \" -test \" - is not a list item\n      return -1;\n    }\n  }\n\n  return pos;\n}\n\n// Search `\\d+[.)][\\n ]`, returns next pos after marker on success\n// or -1 on fail.\nfunction skipOrderedListMarker(state, startLine) {\n  var ch,\n      start = state.bMarks[startLine] + state.tShift[startLine],\n      pos = start,\n      max = state.eMarks[startLine];\n\n  // List marker should have at least 2 chars (digit + dot)\n  if (pos + 1 >= max) { return -1; }\n\n  ch = state.src.charCodeAt(pos++);\n\n  if (ch < 0x30/* 0 */ || ch > 0x39/* 9 */) { return -1; }\n\n  for (;;) {\n    // EOL -> fail\n    if (pos >= max) { return -1; }\n\n    ch = state.src.charCodeAt(pos++);\n\n    if (ch >= 0x30/* 0 */ && ch <= 0x39/* 9 */) {\n\n      // List marker should have no more than 9 digits\n      // (prevents integer overflow in browsers)\n      if (pos - start >= 10) { return -1; }\n\n      continue;\n    }\n\n    // found valid marker\n    if (ch === 0x29/* ) */ || ch === 0x2e/* . */) {\n      break;\n    }\n\n    return -1;\n  }\n\n\n  if (pos < max) {\n    ch = state.src.charCodeAt(pos);\n\n    if (!isSpace(ch)) {\n      // \" 1.test \" - is not a list item\n      return -1;\n    }\n  }\n  return pos;\n}\n\nfunction markTightParagraphs(state, idx) {\n  var i, l,\n      level = state.level + 2;\n\n  for (i = idx + 2, l = state.tokens.length - 2; i < l; i++) {\n    if (state.tokens[i].level === level && state.tokens[i].type === 'paragraph_open') {\n      state.tokens[i + 2].hidden = true;\n      state.tokens[i].hidden = true;\n      i += 2;\n    }\n  }\n}\n\n\nmodule.exports = function list(state, startLine, endLine, silent) {\n  var ch,\n      contentStart,\n      i,\n      indent,\n      indentAfterMarker,\n      initial,\n      isOrdered,\n      itemLines,\n      l,\n      listLines,\n      listTokIdx,\n      markerCharCode,\n      markerValue,\n      max,\n      nextLine,\n      offset,\n      oldIndent,\n      oldLIndent,\n      oldParentType,\n      oldTShift,\n      oldTight,\n      pos,\n      posAfterMarker,\n      prevEmptyEnd,\n      start,\n      terminate,\n      terminatorRules,\n      token,\n      isTerminatingParagraph = false,\n      tight = true;\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  // limit conditions when list can interrupt\n  // a paragraph (validation mode only)\n  if (silent && state.parentType === 'paragraph') {\n    // Next list item should still terminate previous list item;\n    //\n    // This code can fail if plugins use blkIndent as well as lists,\n    // but I hope the spec gets fixed long before that happens.\n    //\n    if (state.tShift[startLine] >= state.blkIndent) {\n      isTerminatingParagraph = true;\n    }\n  }\n\n  // Detect list type and position after marker\n  if ((posAfterMarker = skipOrderedListMarker(state, startLine)) >= 0) {\n    isOrdered = true;\n    start = state.bMarks[startLine] + state.tShift[startLine];\n    markerValue = Number(state.src.substr(start, posAfterMarker - start - 1));\n\n    // If we're starting a new ordered list right after\n    // a paragraph, it should start with 1.\n    if (isTerminatingParagraph && markerValue !== 1) return false;\n\n  } else if ((posAfterMarker = skipBulletListMarker(state, startLine)) >= 0) {\n    isOrdered = false;\n\n  } else {\n    return false;\n  }\n\n  // If we're starting a new unordered list right after\n  // a paragraph, first line should not be empty.\n  if (isTerminatingParagraph) {\n    if (state.skipSpaces(posAfterMarker) >= state.eMarks[startLine]) return false;\n  }\n\n  // We should terminate list on style change. Remember first one to compare.\n  markerCharCode = state.src.charCodeAt(posAfterMarker - 1);\n\n  // For validation mode we can terminate immediately\n  if (silent) { return true; }\n\n  // Start list\n  listTokIdx = state.tokens.length;\n\n  if (isOrdered) {\n    token       = state.push('ordered_list_open', 'ol', 1);\n    if (markerValue !== 1) {\n      token.attrs = [ [ 'start', markerValue ] ];\n    }\n\n  } else {\n    token       = state.push('bullet_list_open', 'ul', 1);\n  }\n\n  token.map    = listLines = [ startLine, 0 ];\n  token.markup = String.fromCharCode(markerCharCode);\n\n  //\n  // Iterate list items\n  //\n\n  nextLine = startLine;\n  prevEmptyEnd = false;\n  terminatorRules = state.md.block.ruler.getRules('list');\n\n  oldParentType = state.parentType;\n  state.parentType = 'list';\n\n  while (nextLine < endLine) {\n    pos = posAfterMarker;\n    max = state.eMarks[nextLine];\n\n    initial = offset = state.sCount[nextLine] + posAfterMarker - (state.bMarks[startLine] + state.tShift[startLine]);\n\n    while (pos < max) {\n      ch = state.src.charCodeAt(pos);\n\n      if (ch === 0x09) {\n        offset += 4 - (offset + state.bsCount[nextLine]) % 4;\n      } else if (ch === 0x20) {\n        offset++;\n      } else {\n        break;\n      }\n\n      pos++;\n    }\n\n    contentStart = pos;\n\n    if (contentStart >= max) {\n      // trimming space in \"-    \\n  3\" case, indent is 1 here\n      indentAfterMarker = 1;\n    } else {\n      indentAfterMarker = offset - initial;\n    }\n\n    // If we have more than 4 spaces, the indent is 1\n    // (the rest is just indented code block)\n    if (indentAfterMarker > 4) { indentAfterMarker = 1; }\n\n    // \"  -  test\"\n    //  ^^^^^ - calculating total length of this thing\n    indent = initial + indentAfterMarker;\n\n    // Run subparser & write tokens\n    token        = state.push('list_item_open', 'li', 1);\n    token.markup = String.fromCharCode(markerCharCode);\n    token.map    = itemLines = [ startLine, 0 ];\n\n    oldIndent = state.blkIndent;\n    oldTight = state.tight;\n    oldTShift = state.tShift[startLine];\n    oldLIndent = state.sCount[startLine];\n    state.blkIndent = indent;\n    state.tight = true;\n    state.tShift[startLine] = contentStart - state.bMarks[startLine];\n    state.sCount[startLine] = offset;\n\n    if (contentStart >= max && state.isEmpty(startLine + 1)) {\n      // workaround for this case\n      // (list item is empty, list terminates before \"foo\"):\n      // ~~~~~~~~\n      //   -\n      //\n      //     foo\n      // ~~~~~~~~\n      state.line = Math.min(state.line + 2, endLine);\n    } else {\n      state.md.block.tokenize(state, startLine, endLine, true);\n    }\n\n    // If any of list item is tight, mark list as tight\n    if (!state.tight || prevEmptyEnd) {\n      tight = false;\n    }\n    // Item become loose if finish with empty line,\n    // but we should filter last element, because it means list finish\n    prevEmptyEnd = (state.line - startLine) > 1 && state.isEmpty(state.line - 1);\n\n    state.blkIndent = oldIndent;\n    state.tShift[startLine] = oldTShift;\n    state.sCount[startLine] = oldLIndent;\n    state.tight = oldTight;\n\n    token        = state.push('list_item_close', 'li', -1);\n    token.markup = String.fromCharCode(markerCharCode);\n\n    nextLine = startLine = state.line;\n    itemLines[1] = nextLine;\n    contentStart = state.bMarks[startLine];\n\n    if (nextLine >= endLine) { break; }\n\n    //\n    // Try to check if list is terminated or continued.\n    //\n    if (state.sCount[nextLine] < state.blkIndent) { break; }\n\n    // fail if terminating block found\n    terminate = false;\n    for (i = 0, l = terminatorRules.length; i < l; i++) {\n      if (terminatorRules[i](state, nextLine, endLine, true)) {\n        terminate = true;\n        break;\n      }\n    }\n    if (terminate) { break; }\n\n    // fail if list has another type\n    if (isOrdered) {\n      posAfterMarker = skipOrderedListMarker(state, nextLine);\n      if (posAfterMarker < 0) { break; }\n    } else {\n      posAfterMarker = skipBulletListMarker(state, nextLine);\n      if (posAfterMarker < 0) { break; }\n    }\n\n    if (markerCharCode !== state.src.charCodeAt(posAfterMarker - 1)) { break; }\n  }\n\n  // Finalize list\n  if (isOrdered) {\n    token = state.push('ordered_list_close', 'ol', -1);\n  } else {\n    token = state.push('bullet_list_close', 'ul', -1);\n  }\n  token.markup = String.fromCharCode(markerCharCode);\n\n  listLines[1] = nextLine;\n  state.line = nextLine;\n\n  state.parentType = oldParentType;\n\n  // mark paragraphs tight if needed\n  if (tight) {\n    markTightParagraphs(state, listTokIdx);\n  }\n\n  return true;\n};\n","'use strict';\n\n\nvar normalizeReference   = require('../common/utils').normalizeReference;\nvar isSpace              = require('../common/utils').isSpace;\n\n\nmodule.exports = function reference(state, startLine, _endLine, silent) {\n  var ch,\n      destEndPos,\n      destEndLineNo,\n      endLine,\n      href,\n      i,\n      l,\n      label,\n      labelEnd,\n      oldParentType,\n      res,\n      start,\n      str,\n      terminate,\n      terminatorRules,\n      title,\n      lines = 0,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine],\n      nextLine = startLine + 1;\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  if (state.src.charCodeAt(pos) !== 0x5B/* [ */) { return false; }\n\n  // Simple check to quickly interrupt scan on [link](url) at the start of line.\n  // Can be useful on practice: https://github.com/markdown-it/markdown-it/issues/54\n  while (++pos < max) {\n    if (state.src.charCodeAt(pos) === 0x5D /* ] */ &&\n        state.src.charCodeAt(pos - 1) !== 0x5C/* \\ */) {\n      if (pos + 1 === max) { return false; }\n      if (state.src.charCodeAt(pos + 1) !== 0x3A/* : */) { return false; }\n      break;\n    }\n  }\n\n  endLine = state.lineMax;\n\n  // jump line-by-line until empty one or EOF\n  terminatorRules = state.md.block.ruler.getRules('reference');\n\n  oldParentType = state.parentType;\n  state.parentType = 'reference';\n\n  for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {\n    // this would be a code block normally, but after paragraph\n    // it's considered a lazy continuation regardless of what's there\n    if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }\n\n    // quirk for blockquotes, this line should already be checked by that rule\n    if (state.sCount[nextLine] < 0) { continue; }\n\n    // Some tags can terminate paragraph without empty line.\n    terminate = false;\n    for (i = 0, l = terminatorRules.length; i < l; i++) {\n      if (terminatorRules[i](state, nextLine, endLine, true)) {\n        terminate = true;\n        break;\n      }\n    }\n    if (terminate) { break; }\n  }\n\n  str = state.getLines(startLine, nextLine, state.blkIndent, false).trim();\n  max = str.length;\n\n  for (pos = 1; pos < max; pos++) {\n    ch = str.charCodeAt(pos);\n    if (ch === 0x5B /* [ */) {\n      return false;\n    } else if (ch === 0x5D /* ] */) {\n      labelEnd = pos;\n      break;\n    } else if (ch === 0x0A /* \\n */) {\n      lines++;\n    } else if (ch === 0x5C /* \\ */) {\n      pos++;\n      if (pos < max && str.charCodeAt(pos) === 0x0A) {\n        lines++;\n      }\n    }\n  }\n\n  if (labelEnd < 0 || str.charCodeAt(labelEnd + 1) !== 0x3A/* : */) { return false; }\n\n  // [label]:   destination   'title'\n  //         ^^^ skip optional whitespace here\n  for (pos = labelEnd + 2; pos < max; pos++) {\n    ch = str.charCodeAt(pos);\n    if (ch === 0x0A) {\n      lines++;\n    } else if (isSpace(ch)) {\n      /*eslint no-empty:0*/\n    } else {\n      break;\n    }\n  }\n\n  // [label]:   destination   'title'\n  //            ^^^^^^^^^^^ parse this\n  res = state.md.helpers.parseLinkDestination(str, pos, max);\n  if (!res.ok) { return false; }\n\n  href = state.md.normalizeLink(res.str);\n  if (!state.md.validateLink(href)) { return false; }\n\n  pos = res.pos;\n  lines += res.lines;\n\n  // save cursor state, we could require to rollback later\n  destEndPos = pos;\n  destEndLineNo = lines;\n\n  // [label]:   destination   'title'\n  //                       ^^^ skipping those spaces\n  start = pos;\n  for (; pos < max; pos++) {\n    ch = str.charCodeAt(pos);\n    if (ch === 0x0A) {\n      lines++;\n    } else if (isSpace(ch)) {\n      /*eslint no-empty:0*/\n    } else {\n      break;\n    }\n  }\n\n  // [label]:   destination   'title'\n  //                          ^^^^^^^ parse this\n  res = state.md.helpers.parseLinkTitle(str, pos, max);\n  if (pos < max && start !== pos && res.ok) {\n    title = res.str;\n    pos = res.pos;\n    lines += res.lines;\n  } else {\n    title = '';\n    pos = destEndPos;\n    lines = destEndLineNo;\n  }\n\n  // skip trailing spaces until the rest of the line\n  while (pos < max) {\n    ch = str.charCodeAt(pos);\n    if (!isSpace(ch)) { break; }\n    pos++;\n  }\n\n  if (pos < max && str.charCodeAt(pos) !== 0x0A) {\n    if (title) {\n      // garbage at the end of the line after title,\n      // but it could still be a valid reference if we roll back\n      title = '';\n      pos = destEndPos;\n      lines = destEndLineNo;\n      while (pos < max) {\n        ch = str.charCodeAt(pos);\n        if (!isSpace(ch)) { break; }\n        pos++;\n      }\n    }\n  }\n\n  if (pos < max && str.charCodeAt(pos) !== 0x0A) {\n    // garbage at the end of the line\n    return false;\n  }\n\n  label = normalizeReference(str.slice(1, labelEnd));\n  if (!label) {\n    // CommonMark 0.20 disallows empty labels\n    return false;\n  }\n\n  // Reference can not terminate anything. This check is for safety only.\n  /*istanbul ignore if*/\n  if (silent) { return true; }\n\n  if (typeof state.env.references === 'undefined') {\n    state.env.references = {};\n  }\n  if (typeof state.env.references[label] === 'undefined') {\n    state.env.references[label] = { title: title, href: href };\n  }\n\n  state.parentType = oldParentType;\n\n  state.line = startLine + lines + 1;\n  return true;\n};\n","// heading (#, ##, ...)\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\nmodule.exports = function heading(state, startLine, endLine, silent) {\n  var ch, level, tmp, token,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine];\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  ch  = state.src.charCodeAt(pos);\n\n  if (ch !== 0x23/* # */ || pos >= max) { return false; }\n\n  // count heading level\n  level = 1;\n  ch = state.src.charCodeAt(++pos);\n  while (ch === 0x23/* # */ && pos < max && level <= 6) {\n    level++;\n    ch = state.src.charCodeAt(++pos);\n  }\n\n  if (level > 6 || (pos < max && !isSpace(ch))) { return false; }\n\n  if (silent) { return true; }\n\n  // Let's cut tails like '    ###  ' from the end of string\n\n  max = state.skipSpacesBack(max, pos);\n  tmp = state.skipCharsBack(max, 0x23, pos); // #\n  if (tmp > pos && isSpace(state.src.charCodeAt(tmp - 1))) {\n    max = tmp;\n  }\n\n  state.line = startLine + 1;\n\n  token        = state.push('heading_open', 'h' + String(level), 1);\n  token.markup = '########'.slice(0, level);\n  token.map    = [ startLine, state.line ];\n\n  token          = state.push('inline', '', 0);\n  token.content  = state.src.slice(pos, max).trim();\n  token.map      = [ startLine, state.line ];\n  token.children = [];\n\n  token        = state.push('heading_close', 'h' + String(level), -1);\n  token.markup = '########'.slice(0, level);\n\n  return true;\n};\n","// lheading (---, ===)\n\n'use strict';\n\n\nmodule.exports = function lheading(state, startLine, endLine/*, silent*/) {\n  var content, terminate, i, l, token, pos, max, level, marker,\n      nextLine = startLine + 1, oldParentType,\n      terminatorRules = state.md.block.ruler.getRules('paragraph');\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  oldParentType = state.parentType;\n  state.parentType = 'paragraph'; // use paragraph to match terminatorRules\n\n  // jump line-by-line until empty one or EOF\n  for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {\n    // this would be a code block normally, but after paragraph\n    // it's considered a lazy continuation regardless of what's there\n    if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }\n\n    //\n    // Check for underline in setext header\n    //\n    if (state.sCount[nextLine] >= state.blkIndent) {\n      pos = state.bMarks[nextLine] + state.tShift[nextLine];\n      max = state.eMarks[nextLine];\n\n      if (pos < max) {\n        marker = state.src.charCodeAt(pos);\n\n        if (marker === 0x2D/* - */ || marker === 0x3D/* = */) {\n          pos = state.skipChars(pos, marker);\n          pos = state.skipSpaces(pos);\n\n          if (pos >= max) {\n            level = (marker === 0x3D/* = */ ? 1 : 2);\n            break;\n          }\n        }\n      }\n    }\n\n    // quirk for blockquotes, this line should already be checked by that rule\n    if (state.sCount[nextLine] < 0) { continue; }\n\n    // Some tags can terminate paragraph without empty line.\n    terminate = false;\n    for (i = 0, l = terminatorRules.length; i < l; i++) {\n      if (terminatorRules[i](state, nextLine, endLine, true)) {\n        terminate = true;\n        break;\n      }\n    }\n    if (terminate) { break; }\n  }\n\n  if (!level) {\n    // Didn't find valid underline\n    return false;\n  }\n\n  content = state.getLines(startLine, nextLine, state.blkIndent, false).trim();\n\n  state.line = nextLine + 1;\n\n  token          = state.push('heading_open', 'h' + String(level), 1);\n  token.markup   = String.fromCharCode(marker);\n  token.map      = [ startLine, state.line ];\n\n  token          = state.push('inline', '', 0);\n  token.content  = content;\n  token.map      = [ startLine, state.line - 1 ];\n  token.children = [];\n\n  token          = state.push('heading_close', 'h' + String(level), -1);\n  token.markup   = String.fromCharCode(marker);\n\n  state.parentType = oldParentType;\n\n  return true;\n};\n","// HTML block\n\n'use strict';\n\n\nvar block_names = require('../common/html_blocks');\nvar HTML_OPEN_CLOSE_TAG_RE = require('../common/html_re').HTML_OPEN_CLOSE_TAG_RE;\n\n// An array of opening and corresponding closing sequences for html tags,\n// last argument defines whether it can terminate a paragraph or not\n//\nvar HTML_SEQUENCES = [\n  [ /^<(script|pre|style)(?=(\\s|>|$))/i, /<\\/(script|pre|style)>/i, true ],\n  [ /^<!--/,        /-->/,   true ],\n  [ /^<\\?/,         /\\?>/,   true ],\n  [ /^<![A-Z]/,     />/,     true ],\n  [ /^<!\\[CDATA\\[/, /\\]\\]>/, true ],\n  [ new RegExp('^</?(' + block_names.join('|') + ')(?=(\\\\s|/?>|$))', 'i'), /^$/, true ],\n  [ new RegExp(HTML_OPEN_CLOSE_TAG_RE.source + '\\\\s*$'),  /^$/, false ]\n];\n\n\nmodule.exports = function html_block(state, startLine, endLine, silent) {\n  var i, nextLine, token, lineText,\n      pos = state.bMarks[startLine] + state.tShift[startLine],\n      max = state.eMarks[startLine];\n\n  // if it's indented more than 3 spaces, it should be a code block\n  if (state.sCount[startLine] - state.blkIndent >= 4) { return false; }\n\n  if (!state.md.options.html) { return false; }\n\n  if (state.src.charCodeAt(pos) !== 0x3C/* < */) { return false; }\n\n  lineText = state.src.slice(pos, max);\n\n  for (i = 0; i < HTML_SEQUENCES.length; i++) {\n    if (HTML_SEQUENCES[i][0].test(lineText)) { break; }\n  }\n\n  if (i === HTML_SEQUENCES.length) { return false; }\n\n  if (silent) {\n    // true if this sequence can be a terminator, false otherwise\n    return HTML_SEQUENCES[i][2];\n  }\n\n  nextLine = startLine + 1;\n\n  // If we are here - we detected HTML block.\n  // Let's roll down till block end.\n  if (!HTML_SEQUENCES[i][1].test(lineText)) {\n    for (; nextLine < endLine; nextLine++) {\n      if (state.sCount[nextLine] < state.blkIndent) { break; }\n\n      pos = state.bMarks[nextLine] + state.tShift[nextLine];\n      max = state.eMarks[nextLine];\n      lineText = state.src.slice(pos, max);\n\n      if (HTML_SEQUENCES[i][1].test(lineText)) {\n        if (lineText.length !== 0) { nextLine++; }\n        break;\n      }\n    }\n  }\n\n  state.line = nextLine;\n\n  token         = state.push('html_block', '', 0);\n  token.map     = [ startLine, nextLine ];\n  token.content = state.getLines(startLine, nextLine, state.blkIndent, true);\n\n  return true;\n};\n","// List of valid html blocks names, accorting to commonmark spec\n// http://jgm.github.io/CommonMark/spec.html#html-blocks\n\n'use strict';\n\n\nmodule.exports = [\n  'address',\n  'article',\n  'aside',\n  'base',\n  'basefont',\n  'blockquote',\n  'body',\n  'caption',\n  'center',\n  'col',\n  'colgroup',\n  'dd',\n  'details',\n  'dialog',\n  'dir',\n  'div',\n  'dl',\n  'dt',\n  'fieldset',\n  'figcaption',\n  'figure',\n  'footer',\n  'form',\n  'frame',\n  'frameset',\n  'h1',\n  'h2',\n  'h3',\n  'h4',\n  'h5',\n  'h6',\n  'head',\n  'header',\n  'hr',\n  'html',\n  'iframe',\n  'legend',\n  'li',\n  'link',\n  'main',\n  'menu',\n  'menuitem',\n  'meta',\n  'nav',\n  'noframes',\n  'ol',\n  'optgroup',\n  'option',\n  'p',\n  'param',\n  'section',\n  'source',\n  'summary',\n  'table',\n  'tbody',\n  'td',\n  'tfoot',\n  'th',\n  'thead',\n  'title',\n  'tr',\n  'track',\n  'ul'\n];\n","// Paragraph\n\n'use strict';\n\n\nmodule.exports = function paragraph(state, startLine/*, endLine*/) {\n  var content, terminate, i, l, token, oldParentType,\n      nextLine = startLine + 1,\n      terminatorRules = state.md.block.ruler.getRules('paragraph'),\n      endLine = state.lineMax;\n\n  oldParentType = state.parentType;\n  state.parentType = 'paragraph';\n\n  // jump line-by-line until empty one or EOF\n  for (; nextLine < endLine && !state.isEmpty(nextLine); nextLine++) {\n    // this would be a code block normally, but after paragraph\n    // it's considered a lazy continuation regardless of what's there\n    if (state.sCount[nextLine] - state.blkIndent > 3) { continue; }\n\n    // quirk for blockquotes, this line should already be checked by that rule\n    if (state.sCount[nextLine] < 0) { continue; }\n\n    // Some tags can terminate paragraph without empty line.\n    terminate = false;\n    for (i = 0, l = terminatorRules.length; i < l; i++) {\n      if (terminatorRules[i](state, nextLine, endLine, true)) {\n        terminate = true;\n        break;\n      }\n    }\n    if (terminate) { break; }\n  }\n\n  content = state.getLines(startLine, nextLine, state.blkIndent, false).trim();\n\n  state.line = nextLine;\n\n  token          = state.push('paragraph_open', 'p', 1);\n  token.map      = [ startLine, state.line ];\n\n  token          = state.push('inline', '', 0);\n  token.content  = content;\n  token.map      = [ startLine, state.line ];\n  token.children = [];\n\n  token          = state.push('paragraph_close', 'p', -1);\n\n  state.parentType = oldParentType;\n\n  return true;\n};\n","// Parser state class\n\n'use strict';\n\nvar Token = require('../token');\nvar isSpace = require('../common/utils').isSpace;\n\n\nfunction StateBlock(src, md, env, tokens) {\n  var ch, s, start, pos, len, indent, offset, indent_found;\n\n  this.src = src;\n\n  // link to parser instance\n  this.md     = md;\n\n  this.env = env;\n\n  //\n  // Internal state vartiables\n  //\n\n  this.tokens = tokens;\n\n  this.bMarks = [];  // line begin offsets for fast jumps\n  this.eMarks = [];  // line end offsets for fast jumps\n  this.tShift = [];  // offsets of the first non-space characters (tabs not expanded)\n  this.sCount = [];  // indents for each line (tabs expanded)\n\n  // An amount of virtual spaces (tabs expanded) between beginning\n  // of each line (bMarks) and real beginning of that line.\n  //\n  // It exists only as a hack because blockquotes override bMarks\n  // losing information in the process.\n  //\n  // It's used only when expanding tabs, you can think about it as\n  // an initial tab length, e.g. bsCount=21 applied to string `\\t123`\n  // means first tab should be expanded to 4-21%4 === 3 spaces.\n  //\n  this.bsCount = [];\n\n  // block parser variables\n  this.blkIndent  = 0; // required block content indent\n                       // (for example, if we are in list)\n  this.line       = 0; // line index in src\n  this.lineMax    = 0; // lines count\n  this.tight      = false;  // loose/tight mode for lists\n  this.ddIndent   = -1; // indent of the current dd block (-1 if there isn't any)\n\n  // can be 'blockquote', 'list', 'root', 'paragraph' or 'reference'\n  // used in lists to determine if they interrupt a paragraph\n  this.parentType = 'root';\n\n  this.level = 0;\n\n  // renderer\n  this.result = '';\n\n  // Create caches\n  // Generate markers.\n  s = this.src;\n  indent_found = false;\n\n  for (start = pos = indent = offset = 0, len = s.length; pos < len; pos++) {\n    ch = s.charCodeAt(pos);\n\n    if (!indent_found) {\n      if (isSpace(ch)) {\n        indent++;\n\n        if (ch === 0x09) {\n          offset += 4 - offset % 4;\n        } else {\n          offset++;\n        }\n        continue;\n      } else {\n        indent_found = true;\n      }\n    }\n\n    if (ch === 0x0A || pos === len - 1) {\n      if (ch !== 0x0A) { pos++; }\n      this.bMarks.push(start);\n      this.eMarks.push(pos);\n      this.tShift.push(indent);\n      this.sCount.push(offset);\n      this.bsCount.push(0);\n\n      indent_found = false;\n      indent = 0;\n      offset = 0;\n      start = pos + 1;\n    }\n  }\n\n  // Push fake entry to simplify cache bounds checks\n  this.bMarks.push(s.length);\n  this.eMarks.push(s.length);\n  this.tShift.push(0);\n  this.sCount.push(0);\n  this.bsCount.push(0);\n\n  this.lineMax = this.bMarks.length - 1; // don't count last fake line\n}\n\n// Push new token to \"stream\".\n//\nStateBlock.prototype.push = function (type, tag, nesting) {\n  var token = new Token(type, tag, nesting);\n  token.block = true;\n\n  if (nesting < 0) { this.level--; }\n  token.level = this.level;\n  if (nesting > 0) { this.level++; }\n\n  this.tokens.push(token);\n  return token;\n};\n\nStateBlock.prototype.isEmpty = function isEmpty(line) {\n  return this.bMarks[line] + this.tShift[line] >= this.eMarks[line];\n};\n\nStateBlock.prototype.skipEmptyLines = function skipEmptyLines(from) {\n  for (var max = this.lineMax; from < max; from++) {\n    if (this.bMarks[from] + this.tShift[from] < this.eMarks[from]) {\n      break;\n    }\n  }\n  return from;\n};\n\n// Skip spaces from given position.\nStateBlock.prototype.skipSpaces = function skipSpaces(pos) {\n  var ch;\n\n  for (var max = this.src.length; pos < max; pos++) {\n    ch = this.src.charCodeAt(pos);\n    if (!isSpace(ch)) { break; }\n  }\n  return pos;\n};\n\n// Skip spaces from given position in reverse.\nStateBlock.prototype.skipSpacesBack = function skipSpacesBack(pos, min) {\n  if (pos <= min) { return pos; }\n\n  while (pos > min) {\n    if (!isSpace(this.src.charCodeAt(--pos))) { return pos + 1; }\n  }\n  return pos;\n};\n\n// Skip char codes from given position\nStateBlock.prototype.skipChars = function skipChars(pos, code) {\n  for (var max = this.src.length; pos < max; pos++) {\n    if (this.src.charCodeAt(pos) !== code) { break; }\n  }\n  return pos;\n};\n\n// Skip char codes reverse from given position - 1\nStateBlock.prototype.skipCharsBack = function skipCharsBack(pos, code, min) {\n  if (pos <= min) { return pos; }\n\n  while (pos > min) {\n    if (code !== this.src.charCodeAt(--pos)) { return pos + 1; }\n  }\n  return pos;\n};\n\n// cut lines range from source.\nStateBlock.prototype.getLines = function getLines(begin, end, indent, keepLastLF) {\n  var i, lineIndent, ch, first, last, queue, lineStart,\n      line = begin;\n\n  if (begin >= end) {\n    return '';\n  }\n\n  queue = new Array(end - begin);\n\n  for (i = 0; line < end; line++, i++) {\n    lineIndent = 0;\n    lineStart = first = this.bMarks[line];\n\n    if (line + 1 < end || keepLastLF) {\n      // No need for bounds check because we have fake entry on tail.\n      last = this.eMarks[line] + 1;\n    } else {\n      last = this.eMarks[line];\n    }\n\n    while (first < last && lineIndent < indent) {\n      ch = this.src.charCodeAt(first);\n\n      if (isSpace(ch)) {\n        if (ch === 0x09) {\n          lineIndent += 4 - (lineIndent + this.bsCount[line]) % 4;\n        } else {\n          lineIndent++;\n        }\n      } else if (first - lineStart < this.tShift[line]) {\n        // patched tShift masked characters to look like spaces (blockquotes, list markers)\n        lineIndent++;\n      } else {\n        break;\n      }\n\n      first++;\n    }\n\n    if (lineIndent > indent) {\n      // partially expanding tabs in code blocks, e.g '\\t\\tfoobar'\n      // with indent=2 becomes '  \\tfoobar'\n      queue[i] = new Array(lineIndent - indent + 1).join(' ') + this.src.slice(first, last);\n    } else {\n      queue[i] = this.src.slice(first, last);\n    }\n  }\n\n  return queue.join('');\n};\n\n// re-export Token class to use in block rules\nStateBlock.prototype.Token = Token;\n\n\nmodule.exports = StateBlock;\n","/** internal\n * class ParserInline\n *\n * Tokenizes paragraph content.\n **/\n'use strict';\n\n\nvar Ruler           = require('./ruler');\n\n\n////////////////////////////////////////////////////////////////////////////////\n// Parser rules\n\nvar _rules = [\n  [ 'text',            require('./rules_inline/text') ],\n  [ 'newline',         require('./rules_inline/newline') ],\n  [ 'escape',          require('./rules_inline/escape') ],\n  [ 'backticks',       require('./rules_inline/backticks') ],\n  [ 'strikethrough',   require('./rules_inline/strikethrough').tokenize ],\n  [ 'emphasis',        require('./rules_inline/emphasis').tokenize ],\n  [ 'link',            require('./rules_inline/link') ],\n  [ 'image',           require('./rules_inline/image') ],\n  [ 'autolink',        require('./rules_inline/autolink') ],\n  [ 'html_inline',     require('./rules_inline/html_inline') ],\n  [ 'entity',          require('./rules_inline/entity') ]\n];\n\nvar _rules2 = [\n  [ 'balance_pairs',   require('./rules_inline/balance_pairs') ],\n  [ 'strikethrough',   require('./rules_inline/strikethrough').postProcess ],\n  [ 'emphasis',        require('./rules_inline/emphasis').postProcess ],\n  [ 'text_collapse',   require('./rules_inline/text_collapse') ]\n];\n\n\n/**\n * new ParserInline()\n **/\nfunction ParserInline() {\n  var i;\n\n  /**\n   * ParserInline#ruler -> Ruler\n   *\n   * [[Ruler]] instance. Keep configuration of inline rules.\n   **/\n  this.ruler = new Ruler();\n\n  for (i = 0; i < _rules.length; i++) {\n    this.ruler.push(_rules[i][0], _rules[i][1]);\n  }\n\n  /**\n   * ParserInline#ruler2 -> Ruler\n   *\n   * [[Ruler]] instance. Second ruler used for post-processing\n   * (e.g. in emphasis-like rules).\n   **/\n  this.ruler2 = new Ruler();\n\n  for (i = 0; i < _rules2.length; i++) {\n    this.ruler2.push(_rules2[i][0], _rules2[i][1]);\n  }\n}\n\n\n// Skip single token by running all rules in validation mode;\n// returns `true` if any rule reported success\n//\nParserInline.prototype.skipToken = function (state) {\n  var ok, i, pos = state.pos,\n      rules = this.ruler.getRules(''),\n      len = rules.length,\n      maxNesting = state.md.options.maxNesting,\n      cache = state.cache;\n\n\n  if (typeof cache[pos] !== 'undefined') {\n    state.pos = cache[pos];\n    return;\n  }\n\n  if (state.level < maxNesting) {\n    for (i = 0; i < len; i++) {\n      // Increment state.level and decrement it later to limit recursion.\n      // It's harmless to do here, because no tokens are created. But ideally,\n      // we'd need a separate private state variable for this purpose.\n      //\n      state.level++;\n      ok = rules[i](state, true);\n      state.level--;\n\n      if (ok) { break; }\n    }\n  } else {\n    // Too much nesting, just skip until the end of the paragraph.\n    //\n    // NOTE: this will cause links to behave incorrectly in the following case,\n    //       when an amount of `[` is exactly equal to `maxNesting + 1`:\n    //\n    //       [[[[[[[[[[[[[[[[[[[[[foo]()\n    //\n    // TODO: remove this workaround when CM standard will allow nested links\n    //       (we can replace it by preventing links from being parsed in\n    //       validation mode)\n    //\n    state.pos = state.posMax;\n  }\n\n  if (!ok) { state.pos++; }\n  cache[pos] = state.pos;\n};\n\n\n// Generate tokens for input range\n//\nParserInline.prototype.tokenize = function (state) {\n  var ok, i,\n      rules = this.ruler.getRules(''),\n      len = rules.length,\n      end = state.posMax,\n      maxNesting = state.md.options.maxNesting;\n\n  while (state.pos < end) {\n    // Try all possible rules.\n    // On success, rule should:\n    //\n    // - update `state.pos`\n    // - update `state.tokens`\n    // - return true\n\n    if (state.level < maxNesting) {\n      for (i = 0; i < len; i++) {\n        ok = rules[i](state, false);\n        if (ok) { break; }\n      }\n    }\n\n    if (ok) {\n      if (state.pos >= end) { break; }\n      continue;\n    }\n\n    state.pending += state.src[state.pos++];\n  }\n\n  if (state.pending) {\n    state.pushPending();\n  }\n};\n\n\n/**\n * ParserInline.parse(str, md, env, outTokens)\n *\n * Process input string and push inline tokens into `outTokens`\n **/\nParserInline.prototype.parse = function (str, md, env, outTokens) {\n  var i, rules, len;\n  var state = new this.State(str, md, env, outTokens);\n\n  this.tokenize(state);\n\n  rules = this.ruler2.getRules('');\n  len = rules.length;\n\n  for (i = 0; i < len; i++) {\n    rules[i](state);\n  }\n};\n\n\nParserInline.prototype.State = require('./rules_inline/state_inline');\n\n\nmodule.exports = ParserInline;\n","// Skip text characters for text token, place those to pending buffer\n// and increment current pos\n\n'use strict';\n\n\n// Rule to skip pure text\n// '{}$%@~+=:' reserved for extentions\n\n// !, \", #, $, %, &, ', (, ), *, +, ,, -, ., /, :, ;, <, =, >, ?, @, [, \\, ], ^, _, `, {, |, }, or ~\n\n// !!!! Don't confuse with \"Markdown ASCII Punctuation\" chars\n// http://spec.commonmark.org/0.15/#ascii-punctuation-character\nfunction isTerminatorChar(ch) {\n  switch (ch) {\n    case 0x0A/* \\n */:\n    case 0x21/* ! */:\n    case 0x23/* # */:\n    case 0x24/* $ */:\n    case 0x25/* % */:\n    case 0x26/* & */:\n    case 0x2A/* * */:\n    case 0x2B/* + */:\n    case 0x2D/* - */:\n    case 0x3A/* : */:\n    case 0x3C/* < */:\n    case 0x3D/* = */:\n    case 0x3E/* > */:\n    case 0x40/* @ */:\n    case 0x5B/* [ */:\n    case 0x5C/* \\ */:\n    case 0x5D/* ] */:\n    case 0x5E/* ^ */:\n    case 0x5F/* _ */:\n    case 0x60/* ` */:\n    case 0x7B/* { */:\n    case 0x7D/* } */:\n    case 0x7E/* ~ */:\n      return true;\n    default:\n      return false;\n  }\n}\n\nmodule.exports = function text(state, silent) {\n  var pos = state.pos;\n\n  while (pos < state.posMax && !isTerminatorChar(state.src.charCodeAt(pos))) {\n    pos++;\n  }\n\n  if (pos === state.pos) { return false; }\n\n  if (!silent) { state.pending += state.src.slice(state.pos, pos); }\n\n  state.pos = pos;\n\n  return true;\n};\n\n// Alternative implementation, for memory.\n//\n// It costs 10% of performance, but allows extend terminators list, if place it\n// to `ParcerInline` property. Probably, will switch to it sometime, such\n// flexibility required.\n\n/*\nvar TERMINATOR_RE = /[\\n!#$%&*+\\-:<=>@[\\\\\\]^_`{}~]/;\n\nmodule.exports = function text(state, silent) {\n  var pos = state.pos,\n      idx = state.src.slice(pos).search(TERMINATOR_RE);\n\n  // first char is terminator -> empty text\n  if (idx === 0) { return false; }\n\n  // no terminator -> text till end of string\n  if (idx < 0) {\n    if (!silent) { state.pending += state.src.slice(pos); }\n    state.pos = state.src.length;\n    return true;\n  }\n\n  if (!silent) { state.pending += state.src.slice(pos, pos + idx); }\n\n  state.pos += idx;\n\n  return true;\n};*/\n","// Proceess '\\n'\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\n\nmodule.exports = function newline(state, silent) {\n  var pmax, max, pos = state.pos;\n\n  if (state.src.charCodeAt(pos) !== 0x0A/* \\n */) { return false; }\n\n  pmax = state.pending.length - 1;\n  max = state.posMax;\n\n  // '  \\n' -> hardbreak\n  // Lookup in pending chars is bad practice! Don't copy to other rules!\n  // Pending string is stored in concat mode, indexed lookups will cause\n  // convertion to flat mode.\n  if (!silent) {\n    if (pmax >= 0 && state.pending.charCodeAt(pmax) === 0x20) {\n      if (pmax >= 1 && state.pending.charCodeAt(pmax - 1) === 0x20) {\n        state.pending = state.pending.replace(/ +$/, '');\n        state.push('hardbreak', 'br', 0);\n      } else {\n        state.pending = state.pending.slice(0, -1);\n        state.push('softbreak', 'br', 0);\n      }\n\n    } else {\n      state.push('softbreak', 'br', 0);\n    }\n  }\n\n  pos++;\n\n  // skip heading spaces for next line\n  while (pos < max && isSpace(state.src.charCodeAt(pos))) { pos++; }\n\n  state.pos = pos;\n  return true;\n};\n","// Process escaped chars and hardbreaks\n\n'use strict';\n\nvar isSpace = require('../common/utils').isSpace;\n\nvar ESCAPED = [];\n\nfor (var i = 0; i < 256; i++) { ESCAPED.push(0); }\n\n'\\\\!\"#$%&\\'()*+,./:;<=>?@[]^_`{|}~-'\n  .split('').forEach(function (ch) { ESCAPED[ch.charCodeAt(0)] = 1; });\n\n\nmodule.exports = function escape(state, silent) {\n  var ch, pos = state.pos, max = state.posMax;\n\n  if (state.src.charCodeAt(pos) !== 0x5C/* \\ */) { return false; }\n\n  pos++;\n\n  if (pos < max) {\n    ch = state.src.charCodeAt(pos);\n\n    if (ch < 256 && ESCAPED[ch] !== 0) {\n      if (!silent) { state.pending += state.src[pos]; }\n      state.pos += 2;\n      return true;\n    }\n\n    if (ch === 0x0A) {\n      if (!silent) {\n        state.push('hardbreak', 'br', 0);\n      }\n\n      pos++;\n      // skip leading whitespaces from next line\n      while (pos < max) {\n        ch = state.src.charCodeAt(pos);\n        if (!isSpace(ch)) { break; }\n        pos++;\n      }\n\n      state.pos = pos;\n      return true;\n    }\n  }\n\n  if (!silent) { state.pending += '\\\\'; }\n  state.pos++;\n  return true;\n};\n","// Parse backticks\n\n'use strict';\n\nmodule.exports = function backtick(state, silent) {\n  var start, max, marker, matchStart, matchEnd, token,\n      pos = state.pos,\n      ch = state.src.charCodeAt(pos);\n\n  if (ch !== 0x60/* ` */) { return false; }\n\n  start = pos;\n  pos++;\n  max = state.posMax;\n\n  while (pos < max && state.src.charCodeAt(pos) === 0x60/* ` */) { pos++; }\n\n  marker = state.src.slice(start, pos);\n\n  matchStart = matchEnd = pos;\n\n  while ((matchStart = state.src.indexOf('`', matchEnd)) !== -1) {\n    matchEnd = matchStart + 1;\n\n    while (matchEnd < max && state.src.charCodeAt(matchEnd) === 0x60/* ` */) { matchEnd++; }\n\n    if (matchEnd - matchStart === marker.length) {\n      if (!silent) {\n        token         = state.push('code_inline', 'code', 0);\n        token.markup  = marker;\n        token.content = state.src.slice(pos, matchStart)\n                                 .replace(/[ \\n]+/g, ' ')\n                                 .trim();\n      }\n      state.pos = matchEnd;\n      return true;\n    }\n  }\n\n  if (!silent) { state.pending += marker; }\n  state.pos += marker.length;\n  return true;\n};\n","// Process [link](<to> \"stuff\")\n\n'use strict';\n\nvar normalizeReference   = require('../common/utils').normalizeReference;\nvar isSpace              = require('../common/utils').isSpace;\n\n\nmodule.exports = function link(state, silent) {\n  var attrs,\n      code,\n      label,\n      labelEnd,\n      labelStart,\n      pos,\n      res,\n      ref,\n      title,\n      token,\n      href = '',\n      oldPos = state.pos,\n      max = state.posMax,\n      start = state.pos,\n      parseReference = true;\n\n  if (state.src.charCodeAt(state.pos) !== 0x5B/* [ */) { return false; }\n\n  labelStart = state.pos + 1;\n  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos, true);\n\n  // parser failed to find ']', so it's not a valid link\n  if (labelEnd < 0) { return false; }\n\n  pos = labelEnd + 1;\n  if (pos < max && state.src.charCodeAt(pos) === 0x28/* ( */) {\n    //\n    // Inline link\n    //\n\n    // might have found a valid shortcut link, disable reference parsing\n    parseReference = false;\n\n    // [link](  <href>  \"title\"  )\n    //        ^^ skipping these spaces\n    pos++;\n    for (; pos < max; pos++) {\n      code = state.src.charCodeAt(pos);\n      if (!isSpace(code) && code !== 0x0A) { break; }\n    }\n    if (pos >= max) { return false; }\n\n    // [link](  <href>  \"title\"  )\n    //          ^^^^^^ parsing link destination\n    start = pos;\n    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax);\n    if (res.ok) {\n      href = state.md.normalizeLink(res.str);\n      if (state.md.validateLink(href)) {\n        pos = res.pos;\n      } else {\n        href = '';\n      }\n    }\n\n    // [link](  <href>  \"title\"  )\n    //                ^^ skipping these spaces\n    start = pos;\n    for (; pos < max; pos++) {\n      code = state.src.charCodeAt(pos);\n      if (!isSpace(code) && code !== 0x0A) { break; }\n    }\n\n    // [link](  <href>  \"title\"  )\n    //                  ^^^^^^^ parsing link title\n    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);\n    if (pos < max && start !== pos && res.ok) {\n      title = res.str;\n      pos = res.pos;\n\n      // [link](  <href>  \"title\"  )\n      //                         ^^ skipping these spaces\n      for (; pos < max; pos++) {\n        code = state.src.charCodeAt(pos);\n        if (!isSpace(code) && code !== 0x0A) { break; }\n      }\n    } else {\n      title = '';\n    }\n\n    if (pos >= max || state.src.charCodeAt(pos) !== 0x29/* ) */) {\n      // parsing a valid shortcut link failed, fallback to reference\n      parseReference = true;\n    }\n    pos++;\n  }\n\n  if (parseReference) {\n    //\n    // Link reference\n    //\n    if (typeof state.env.references === 'undefined') { return false; }\n\n    if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {\n      start = pos + 1;\n      pos = state.md.helpers.parseLinkLabel(state, pos);\n      if (pos >= 0) {\n        label = state.src.slice(start, pos++);\n      } else {\n        pos = labelEnd + 1;\n      }\n    } else {\n      pos = labelEnd + 1;\n    }\n\n    // covers label === '' and label === undefined\n    // (collapsed reference link and shortcut reference link respectively)\n    if (!label) { label = state.src.slice(labelStart, labelEnd); }\n\n    ref = state.env.references[normalizeReference(label)];\n    if (!ref) {\n      state.pos = oldPos;\n      return false;\n    }\n    href = ref.href;\n    title = ref.title;\n  }\n\n  //\n  // We found the end of the link, and know for a fact it's a valid link;\n  // so all that's left to do is to call tokenizer.\n  //\n  if (!silent) {\n    state.pos = labelStart;\n    state.posMax = labelEnd;\n\n    token        = state.push('link_open', 'a', 1);\n    token.attrs  = attrs = [ [ 'href', href ] ];\n    if (title) {\n      attrs.push([ 'title', title ]);\n    }\n\n    state.md.inline.tokenize(state);\n\n    token        = state.push('link_close', 'a', -1);\n  }\n\n  state.pos = pos;\n  state.posMax = max;\n  return true;\n};\n","// Process ![image](<src> \"title\")\n\n'use strict';\n\nvar normalizeReference   = require('../common/utils').normalizeReference;\nvar isSpace              = require('../common/utils').isSpace;\n\n\nmodule.exports = function image(state, silent) {\n  var attrs,\n      code,\n      content,\n      label,\n      labelEnd,\n      labelStart,\n      pos,\n      ref,\n      res,\n      title,\n      token,\n      tokens,\n      start,\n      href = '',\n      oldPos = state.pos,\n      max = state.posMax;\n\n  if (state.src.charCodeAt(state.pos) !== 0x21/* ! */) { return false; }\n  if (state.src.charCodeAt(state.pos + 1) !== 0x5B/* [ */) { return false; }\n\n  labelStart = state.pos + 2;\n  labelEnd = state.md.helpers.parseLinkLabel(state, state.pos + 1, false);\n\n  // parser failed to find ']', so it's not a valid link\n  if (labelEnd < 0) { return false; }\n\n  pos = labelEnd + 1;\n  if (pos < max && state.src.charCodeAt(pos) === 0x28/* ( */) {\n    //\n    // Inline link\n    //\n\n    // [link](  <href>  \"title\"  )\n    //        ^^ skipping these spaces\n    pos++;\n    for (; pos < max; pos++) {\n      code = state.src.charCodeAt(pos);\n      if (!isSpace(code) && code !== 0x0A) { break; }\n    }\n    if (pos >= max) { return false; }\n\n    // [link](  <href>  \"title\"  )\n    //          ^^^^^^ parsing link destination\n    start = pos;\n    res = state.md.helpers.parseLinkDestination(state.src, pos, state.posMax);\n    if (res.ok) {\n      href = state.md.normalizeLink(res.str);\n      if (state.md.validateLink(href)) {\n        pos = res.pos;\n      } else {\n        href = '';\n      }\n    }\n\n    // [link](  <href>  \"title\"  )\n    //                ^^ skipping these spaces\n    start = pos;\n    for (; pos < max; pos++) {\n      code = state.src.charCodeAt(pos);\n      if (!isSpace(code) && code !== 0x0A) { break; }\n    }\n\n    // [link](  <href>  \"title\"  )\n    //                  ^^^^^^^ parsing link title\n    res = state.md.helpers.parseLinkTitle(state.src, pos, state.posMax);\n    if (pos < max && start !== pos && res.ok) {\n      title = res.str;\n      pos = res.pos;\n\n      // [link](  <href>  \"title\"  )\n      //                         ^^ skipping these spaces\n      for (; pos < max; pos++) {\n        code = state.src.charCodeAt(pos);\n        if (!isSpace(code) && code !== 0x0A) { break; }\n      }\n    } else {\n      title = '';\n    }\n\n    if (pos >= max || state.src.charCodeAt(pos) !== 0x29/* ) */) {\n      state.pos = oldPos;\n      return false;\n    }\n    pos++;\n  } else {\n    //\n    // Link reference\n    //\n    if (typeof state.env.references === 'undefined') { return false; }\n\n    if (pos < max && state.src.charCodeAt(pos) === 0x5B/* [ */) {\n      start = pos + 1;\n      pos = state.md.helpers.parseLinkLabel(state, pos);\n      if (pos >= 0) {\n        label = state.src.slice(start, pos++);\n      } else {\n        pos = labelEnd + 1;\n      }\n    } else {\n      pos = labelEnd + 1;\n    }\n\n    // covers label === '' and label === undefined\n    // (collapsed reference link and shortcut reference link respectively)\n    if (!label) { label = state.src.slice(labelStart, labelEnd); }\n\n    ref = state.env.references[normalizeReference(label)];\n    if (!ref) {\n      state.pos = oldPos;\n      return false;\n    }\n    href = ref.href;\n    title = ref.title;\n  }\n\n  //\n  // We found the end of the link, and know for a fact it's a valid link;\n  // so all that's left to do is to call tokenizer.\n  //\n  if (!silent) {\n    content = state.src.slice(labelStart, labelEnd);\n\n    state.md.inline.parse(\n      content,\n      state.md,\n      state.env,\n      tokens = []\n    );\n\n    token          = state.push('image', 'img', 0);\n    token.attrs    = attrs = [ [ 'src', href ], [ 'alt', '' ] ];\n    token.children = tokens;\n    token.content  = content;\n\n    if (title) {\n      attrs.push([ 'title', title ]);\n    }\n  }\n\n  state.pos = pos;\n  state.posMax = max;\n  return true;\n};\n","// Process autolinks '<protocol:...>'\n\n'use strict';\n\n\n/*eslint max-len:0*/\nvar EMAIL_RE    = /^<([a-zA-Z0-9.!#$%&'*+\\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?(?:\\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*)>/;\nvar AUTOLINK_RE = /^<([a-zA-Z][a-zA-Z0-9+.\\-]{1,31}):([^<>\\x00-\\x20]*)>/;\n\n\nmodule.exports = function autolink(state, silent) {\n  var tail, linkMatch, emailMatch, url, fullUrl, token,\n      pos = state.pos;\n\n  if (state.src.charCodeAt(pos) !== 0x3C/* < */) { return false; }\n\n  tail = state.src.slice(pos);\n\n  if (tail.indexOf('>') < 0) { return false; }\n\n  if (AUTOLINK_RE.test(tail)) {\n    linkMatch = tail.match(AUTOLINK_RE);\n\n    url = linkMatch[0].slice(1, -1);\n    fullUrl = state.md.normalizeLink(url);\n    if (!state.md.validateLink(fullUrl)) { return false; }\n\n    if (!silent) {\n      token         = state.push('link_open', 'a', 1);\n      token.attrs   = [ [ 'href', fullUrl ] ];\n      token.markup  = 'autolink';\n      token.info    = 'auto';\n\n      token         = state.push('text', '', 0);\n      token.content = state.md.normalizeLinkText(url);\n\n      token         = state.push('link_close', 'a', -1);\n      token.markup  = 'autolink';\n      token.info    = 'auto';\n    }\n\n    state.pos += linkMatch[0].length;\n    return true;\n  }\n\n  if (EMAIL_RE.test(tail)) {\n    emailMatch = tail.match(EMAIL_RE);\n\n    url = emailMatch[0].slice(1, -1);\n    fullUrl = state.md.normalizeLink('mailto:' + url);\n    if (!state.md.validateLink(fullUrl)) { return false; }\n\n    if (!silent) {\n      token         = state.push('link_open', 'a', 1);\n      token.attrs   = [ [ 'href', fullUrl ] ];\n      token.markup  = 'autolink';\n      token.info    = 'auto';\n\n      token         = state.push('text', '', 0);\n      token.content = state.md.normalizeLinkText(url);\n\n      token         = state.push('link_close', 'a', -1);\n      token.markup  = 'autolink';\n      token.info    = 'auto';\n    }\n\n    state.pos += emailMatch[0].length;\n    return true;\n  }\n\n  return false;\n};\n","// Process html tags\n\n'use strict';\n\n\nvar HTML_TAG_RE = require('../common/html_re').HTML_TAG_RE;\n\n\nfunction isLetter(ch) {\n  /*eslint no-bitwise:0*/\n  var lc = ch | 0x20; // to lower case\n  return (lc >= 0x61/* a */) && (lc <= 0x7a/* z */);\n}\n\n\nmodule.exports = function html_inline(state, silent) {\n  var ch, match, max, token,\n      pos = state.pos;\n\n  if (!state.md.options.html) { return false; }\n\n  // Check start\n  max = state.posMax;\n  if (state.src.charCodeAt(pos) !== 0x3C/* < */ ||\n      pos + 2 >= max) {\n    return false;\n  }\n\n  // Quick fail on second char\n  ch = state.src.charCodeAt(pos + 1);\n  if (ch !== 0x21/* ! */ &&\n      ch !== 0x3F/* ? */ &&\n      ch !== 0x2F/* / */ &&\n      !isLetter(ch)) {\n    return false;\n  }\n\n  match = state.src.slice(pos).match(HTML_TAG_RE);\n  if (!match) { return false; }\n\n  if (!silent) {\n    token         = state.push('html_inline', '', 0);\n    token.content = state.src.slice(pos, pos + match[0].length);\n  }\n  state.pos += match[0].length;\n  return true;\n};\n","// Process html entity - &#123;, &#xAF;, &quot;, ...\n\n'use strict';\n\nvar entities          = require('../common/entities');\nvar has               = require('../common/utils').has;\nvar isValidEntityCode = require('../common/utils').isValidEntityCode;\nvar fromCodePoint     = require('../common/utils').fromCodePoint;\n\n\nvar DIGITAL_RE = /^&#((?:x[a-f0-9]{1,8}|[0-9]{1,8}));/i;\nvar NAMED_RE   = /^&([a-z][a-z0-9]{1,31});/i;\n\n\nmodule.exports = function entity(state, silent) {\n  var ch, code, match, pos = state.pos, max = state.posMax;\n\n  if (state.src.charCodeAt(pos) !== 0x26/* & */) { return false; }\n\n  if (pos + 1 < max) {\n    ch = state.src.charCodeAt(pos + 1);\n\n    if (ch === 0x23 /* # */) {\n      match = state.src.slice(pos).match(DIGITAL_RE);\n      if (match) {\n        if (!silent) {\n          code = match[1][0].toLowerCase() === 'x' ? parseInt(match[1].slice(1), 16) : parseInt(match[1], 10);\n          state.pending += isValidEntityCode(code) ? fromCodePoint(code) : fromCodePoint(0xFFFD);\n        }\n        state.pos += match[0].length;\n        return true;\n      }\n    } else {\n      match = state.src.slice(pos).match(NAMED_RE);\n      if (match) {\n        if (has(entities, match[1])) {\n          if (!silent) { state.pending += entities[match[1]]; }\n          state.pos += match[0].length;\n          return true;\n        }\n      }\n    }\n  }\n\n  if (!silent) { state.pending += '&'; }\n  state.pos++;\n  return true;\n};\n","// For each opening emphasis-like marker find a matching closing one\n//\n'use strict';\n\n\nmodule.exports = function link_pairs(state) {\n  var i, j, lastDelim, currDelim,\n      delimiters = state.delimiters,\n      max = state.delimiters.length;\n\n  for (i = 0; i < max; i++) {\n    lastDelim = delimiters[i];\n\n    if (!lastDelim.close) { continue; }\n\n    j = i - lastDelim.jump - 1;\n\n    while (j >= 0) {\n      currDelim = delimiters[j];\n\n      if (currDelim.open &&\n          currDelim.marker === lastDelim.marker &&\n          currDelim.end < 0 &&\n          currDelim.level === lastDelim.level) {\n\n        // typeofs are for backward compatibility with plugins\n        var odd_match = (currDelim.close || lastDelim.open) &&\n                        typeof currDelim.length !== 'undefined' &&\n                        typeof lastDelim.length !== 'undefined' &&\n                        (currDelim.length + lastDelim.length) % 3 === 0;\n\n        if (!odd_match) {\n          lastDelim.jump = i - j;\n          lastDelim.open = false;\n          currDelim.end  = i;\n          currDelim.jump = 0;\n          break;\n        }\n      }\n\n      j -= currDelim.jump + 1;\n    }\n  }\n};\n","// Merge adjacent text nodes into one, and re-calculate all token levels\n//\n'use strict';\n\n\nmodule.exports = function text_collapse(state) {\n  var curr, last,\n      level = 0,\n      tokens = state.tokens,\n      max = state.tokens.length;\n\n  for (curr = last = 0; curr < max; curr++) {\n    // re-calculate levels\n    level += tokens[curr].nesting;\n    tokens[curr].level = level;\n\n    if (tokens[curr].type === 'text' &&\n        curr + 1 < max &&\n        tokens[curr + 1].type === 'text') {\n\n      // collapse two adjacent text nodes\n      tokens[curr + 1].content = tokens[curr].content + tokens[curr + 1].content;\n    } else {\n      if (curr !== last) { tokens[last] = tokens[curr]; }\n\n      last++;\n    }\n  }\n\n  if (curr !== last) {\n    tokens.length = last;\n  }\n};\n","// Inline parser state\n\n'use strict';\n\n\nvar Token          = require('../token');\nvar isWhiteSpace   = require('../common/utils').isWhiteSpace;\nvar isPunctChar    = require('../common/utils').isPunctChar;\nvar isMdAsciiPunct = require('../common/utils').isMdAsciiPunct;\n\n\nfunction StateInline(src, md, env, outTokens) {\n  this.src = src;\n  this.env = env;\n  this.md = md;\n  this.tokens = outTokens;\n\n  this.pos = 0;\n  this.posMax = this.src.length;\n  this.level = 0;\n  this.pending = '';\n  this.pendingLevel = 0;\n\n  this.cache = {};        // Stores { start: end } pairs. Useful for backtrack\n                          // optimization of pairs parse (emphasis, strikes).\n\n  this.delimiters = [];   // Emphasis-like delimiters\n}\n\n\n// Flush pending text\n//\nStateInline.prototype.pushPending = function () {\n  var token = new Token('text', '', 0);\n  token.content = this.pending;\n  token.level = this.pendingLevel;\n  this.tokens.push(token);\n  this.pending = '';\n  return token;\n};\n\n\n// Push new token to \"stream\".\n// If pending text exists - flush it as text token\n//\nStateInline.prototype.push = function (type, tag, nesting) {\n  if (this.pending) {\n    this.pushPending();\n  }\n\n  var token = new Token(type, tag, nesting);\n\n  if (nesting < 0) { this.level--; }\n  token.level = this.level;\n  if (nesting > 0) { this.level++; }\n\n  this.pendingLevel = this.level;\n  this.tokens.push(token);\n  return token;\n};\n\n\n// Scan a sequence of emphasis-like markers, and determine whether\n// it can start an emphasis sequence or end an emphasis sequence.\n//\n//  - start - position to scan from (it should point at a valid marker);\n//  - canSplitWord - determine if these markers can be found inside a word\n//\nStateInline.prototype.scanDelims = function (start, canSplitWord) {\n  var pos = start, lastChar, nextChar, count, can_open, can_close,\n      isLastWhiteSpace, isLastPunctChar,\n      isNextWhiteSpace, isNextPunctChar,\n      left_flanking = true,\n      right_flanking = true,\n      max = this.posMax,\n      marker = this.src.charCodeAt(start);\n\n  // treat beginning of the line as a whitespace\n  lastChar = start > 0 ? this.src.charCodeAt(start - 1) : 0x20;\n\n  while (pos < max && this.src.charCodeAt(pos) === marker) { pos++; }\n\n  count = pos - start;\n\n  // treat end of the line as a whitespace\n  nextChar = pos < max ? this.src.charCodeAt(pos) : 0x20;\n\n  isLastPunctChar = isMdAsciiPunct(lastChar) || isPunctChar(String.fromCharCode(lastChar));\n  isNextPunctChar = isMdAsciiPunct(nextChar) || isPunctChar(String.fromCharCode(nextChar));\n\n  isLastWhiteSpace = isWhiteSpace(lastChar);\n  isNextWhiteSpace = isWhiteSpace(nextChar);\n\n  if (isNextWhiteSpace) {\n    left_flanking = false;\n  } else if (isNextPunctChar) {\n    if (!(isLastWhiteSpace || isLastPunctChar)) {\n      left_flanking = false;\n    }\n  }\n\n  if (isLastWhiteSpace) {\n    right_flanking = false;\n  } else if (isLastPunctChar) {\n    if (!(isNextWhiteSpace || isNextPunctChar)) {\n      right_flanking = false;\n    }\n  }\n\n  if (!canSplitWord) {\n    can_open  = left_flanking  && (!right_flanking || isLastPunctChar);\n    can_close = right_flanking && (!left_flanking  || isNextPunctChar);\n  } else {\n    can_open  = left_flanking;\n    can_close = right_flanking;\n  }\n\n  return {\n    can_open:  can_open,\n    can_close: can_close,\n    length:    count\n  };\n};\n\n\n// re-export Token class to use in block rules\nStateInline.prototype.Token = Token;\n\n\nmodule.exports = StateInline;\n","'use strict';\n\n\n////////////////////////////////////////////////////////////////////////////////\n// Helpers\n\n// Merge objects\n//\nfunction assign(obj /*from1, from2, from3, ...*/) {\n  var sources = Array.prototype.slice.call(arguments, 1);\n\n  sources.forEach(function (source) {\n    if (!source) { return; }\n\n    Object.keys(source).forEach(function (key) {\n      obj[key] = source[key];\n    });\n  });\n\n  return obj;\n}\n\nfunction _class(obj) { return Object.prototype.toString.call(obj); }\nfunction isString(obj) { return _class(obj) === '[object String]'; }\nfunction isObject(obj) { return _class(obj) === '[object Object]'; }\nfunction isRegExp(obj) { return _class(obj) === '[object RegExp]'; }\nfunction isFunction(obj) { return _class(obj) === '[object Function]'; }\n\n\nfunction escapeRE(str) { return str.replace(/[.?*+^$[\\]\\\\(){}|-]/g, '\\\\$&'); }\n\n////////////////////////////////////////////////////////////////////////////////\n\n\nvar defaultOptions = {\n  fuzzyLink: true,\n  fuzzyEmail: true,\n  fuzzyIP: false\n};\n\n\nfunction isOptionsObj(obj) {\n  return Object.keys(obj || {}).reduce(function (acc, k) {\n    return acc || defaultOptions.hasOwnProperty(k);\n  }, false);\n}\n\n\nvar defaultSchemas = {\n  'http:': {\n    validate: function (text, pos, self) {\n      var tail = text.slice(pos);\n\n      if (!self.re.http) {\n        // compile lazily, because \"host\"-containing variables can change on tlds update.\n        self.re.http =  new RegExp(\n          '^\\\\/\\\\/' + self.re.src_auth + self.re.src_host_port_strict + self.re.src_path, 'i'\n        );\n      }\n      if (self.re.http.test(tail)) {\n        return tail.match(self.re.http)[0].length;\n      }\n      return 0;\n    }\n  },\n  'https:':  'http:',\n  'ftp:':    'http:',\n  '//':      {\n    validate: function (text, pos, self) {\n      var tail = text.slice(pos);\n\n      if (!self.re.no_http) {\n      // compile lazily, because \"host\"-containing variables can change on tlds update.\n        self.re.no_http =  new RegExp(\n          '^' +\n          self.re.src_auth +\n          // Don't allow single-level domains, because of false positives like '//test'\n          // with code comments\n          '(?:localhost|(?:(?:' + self.re.src_domain + ')\\\\.)+' + self.re.src_domain_root + ')' +\n          self.re.src_port +\n          self.re.src_host_terminator +\n          self.re.src_path,\n\n          'i'\n        );\n      }\n\n      if (self.re.no_http.test(tail)) {\n        // should not be `://` & `///`, that protects from errors in protocol name\n        if (pos >= 3 && text[pos - 3] === ':') { return 0; }\n        if (pos >= 3 && text[pos - 3] === '/') { return 0; }\n        return tail.match(self.re.no_http)[0].length;\n      }\n      return 0;\n    }\n  },\n  'mailto:': {\n    validate: function (text, pos, self) {\n      var tail = text.slice(pos);\n\n      if (!self.re.mailto) {\n        self.re.mailto =  new RegExp(\n          '^' + self.re.src_email_name + '@' + self.re.src_host_strict, 'i'\n        );\n      }\n      if (self.re.mailto.test(tail)) {\n        return tail.match(self.re.mailto)[0].length;\n      }\n      return 0;\n    }\n  }\n};\n\n/*eslint-disable max-len*/\n\n// RE pattern for 2-character tlds (autogenerated by ./support/tlds_2char_gen.js)\nvar tlds_2ch_src_re = 'a[cdefgilmnoqrstuwxz]|b[abdefghijmnorstvwyz]|c[acdfghiklmnoruvwxyz]|d[ejkmoz]|e[cegrstu]|f[ijkmor]|g[abdefghilmnpqrstuwy]|h[kmnrtu]|i[delmnoqrst]|j[emop]|k[eghimnprwyz]|l[abcikrstuvy]|m[acdeghklmnopqrstuvwxyz]|n[acefgilopruz]|om|p[aefghklmnrstwy]|qa|r[eosuw]|s[abcdeghijklmnortuvxyz]|t[cdfghjklmnortvwz]|u[agksyz]|v[aceginu]|w[fs]|y[et]|z[amw]';\n\n// DON'T try to make PRs with changes. Extend TLDs with LinkifyIt.tlds() instead\nvar tlds_default = 'biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф'.split('|');\n\n/*eslint-enable max-len*/\n\n////////////////////////////////////////////////////////////////////////////////\n\nfunction resetScanCache(self) {\n  self.__index__ = -1;\n  self.__text_cache__   = '';\n}\n\nfunction createValidator(re) {\n  return function (text, pos) {\n    var tail = text.slice(pos);\n\n    if (re.test(tail)) {\n      return tail.match(re)[0].length;\n    }\n    return 0;\n  };\n}\n\nfunction createNormalizer() {\n  return function (match, self) {\n    self.normalize(match);\n  };\n}\n\n// Schemas compiler. Build regexps.\n//\nfunction compile(self) {\n\n  // Load & clone RE patterns.\n  var re = self.re = require('./lib/re')(self.__opts__);\n\n  // Define dynamic patterns\n  var tlds = self.__tlds__.slice();\n\n  self.onCompile();\n\n  if (!self.__tlds_replaced__) {\n    tlds.push(tlds_2ch_src_re);\n  }\n  tlds.push(re.src_xn);\n\n  re.src_tlds = tlds.join('|');\n\n  function untpl(tpl) { return tpl.replace('%TLDS%', re.src_tlds); }\n\n  re.email_fuzzy      = RegExp(untpl(re.tpl_email_fuzzy), 'i');\n  re.link_fuzzy       = RegExp(untpl(re.tpl_link_fuzzy), 'i');\n  re.link_no_ip_fuzzy = RegExp(untpl(re.tpl_link_no_ip_fuzzy), 'i');\n  re.host_fuzzy_test  = RegExp(untpl(re.tpl_host_fuzzy_test), 'i');\n\n  //\n  // Compile each schema\n  //\n\n  var aliases = [];\n\n  self.__compiled__ = {}; // Reset compiled data\n\n  function schemaError(name, val) {\n    throw new Error('(LinkifyIt) Invalid schema \"' + name + '\": ' + val);\n  }\n\n  Object.keys(self.__schemas__).forEach(function (name) {\n    var val = self.__schemas__[name];\n\n    // skip disabled methods\n    if (val === null) { return; }\n\n    var compiled = { validate: null, link: null };\n\n    self.__compiled__[name] = compiled;\n\n    if (isObject(val)) {\n      if (isRegExp(val.validate)) {\n        compiled.validate = createValidator(val.validate);\n      } else if (isFunction(val.validate)) {\n        compiled.validate = val.validate;\n      } else {\n        schemaError(name, val);\n      }\n\n      if (isFunction(val.normalize)) {\n        compiled.normalize = val.normalize;\n      } else if (!val.normalize) {\n        compiled.normalize = createNormalizer();\n      } else {\n        schemaError(name, val);\n      }\n\n      return;\n    }\n\n    if (isString(val)) {\n      aliases.push(name);\n      return;\n    }\n\n    schemaError(name, val);\n  });\n\n  //\n  // Compile postponed aliases\n  //\n\n  aliases.forEach(function (alias) {\n    if (!self.__compiled__[self.__schemas__[alias]]) {\n      // Silently fail on missed schemas to avoid errons on disable.\n      // schemaError(alias, self.__schemas__[alias]);\n      return;\n    }\n\n    self.__compiled__[alias].validate =\n      self.__compiled__[self.__schemas__[alias]].validate;\n    self.__compiled__[alias].normalize =\n      self.__compiled__[self.__schemas__[alias]].normalize;\n  });\n\n  //\n  // Fake record for guessed links\n  //\n  self.__compiled__[''] = { validate: null, normalize: createNormalizer() };\n\n  //\n  // Build schema condition\n  //\n  var slist = Object.keys(self.__compiled__)\n                      .filter(function (name) {\n                        // Filter disabled & fake schemas\n                        return name.length > 0 && self.__compiled__[name];\n                      })\n                      .map(escapeRE)\n                      .join('|');\n  // (?!_) cause 1.5x slowdown\n  self.re.schema_test   = RegExp('(^|(?!_)(?:[><\\uff5c]|' + re.src_ZPCc + '))(' + slist + ')', 'i');\n  self.re.schema_search = RegExp('(^|(?!_)(?:[><\\uff5c]|' + re.src_ZPCc + '))(' + slist + ')', 'ig');\n\n  self.re.pretest       = RegExp(\n                            '(' + self.re.schema_test.source + ')|' +\n                            '(' + self.re.host_fuzzy_test.source + ')|' +\n                            '@',\n                            'i');\n\n  //\n  // Cleanup\n  //\n\n  resetScanCache(self);\n}\n\n/**\n * class Match\n *\n * Match result. Single element of array, returned by [[LinkifyIt#match]]\n **/\nfunction Match(self, shift) {\n  var start = self.__index__,\n      end   = self.__last_index__,\n      text  = self.__text_cache__.slice(start, end);\n\n  /**\n   * Match#schema -> String\n   *\n   * Prefix (protocol) for matched string.\n   **/\n  this.schema    = self.__schema__.toLowerCase();\n  /**\n   * Match#index -> Number\n   *\n   * First position of matched string.\n   **/\n  this.index     = start + shift;\n  /**\n   * Match#lastIndex -> Number\n   *\n   * Next position after matched string.\n   **/\n  this.lastIndex = end + shift;\n  /**\n   * Match#raw -> String\n   *\n   * Matched string.\n   **/\n  this.raw       = text;\n  /**\n   * Match#text -> String\n   *\n   * Notmalized text of matched string.\n   **/\n  this.text      = text;\n  /**\n   * Match#url -> String\n   *\n   * Normalized url of matched string.\n   **/\n  this.url       = text;\n}\n\nfunction createMatch(self, shift) {\n  var match = new Match(self, shift);\n\n  self.__compiled__[match.schema].normalize(match, self);\n\n  return match;\n}\n\n\n/**\n * class LinkifyIt\n **/\n\n/**\n * new LinkifyIt(schemas, options)\n * - schemas (Object): Optional. Additional schemas to validate (prefix/validator)\n * - options (Object): { fuzzyLink|fuzzyEmail|fuzzyIP: true|false }\n *\n * Creates new linkifier instance with optional additional schemas.\n * Can be called without `new` keyword for convenience.\n *\n * By default understands:\n *\n * - `http(s)://...` , `ftp://...`, `mailto:...` & `//...` links\n * - \"fuzzy\" links and emails (example.com, foo@bar.com).\n *\n * `schemas` is an object, where each key/value describes protocol/rule:\n *\n * - __key__ - link prefix (usually, protocol name with `:` at the end, `skype:`\n *   for example). `linkify-it` makes shure that prefix is not preceeded with\n *   alphanumeric char and symbols. Only whitespaces and punctuation allowed.\n * - __value__ - rule to check tail after link prefix\n *   - _String_ - just alias to existing rule\n *   - _Object_\n *     - _validate_ - validator function (should return matched length on success),\n *       or `RegExp`.\n *     - _normalize_ - optional function to normalize text & url of matched result\n *       (for example, for @twitter mentions).\n *\n * `options`:\n *\n * - __fuzzyLink__ - recognige URL-s without `http(s):` prefix. Default `true`.\n * - __fuzzyIP__ - allow IPs in fuzzy links above. Can conflict with some texts\n *   like version numbers. Default `false`.\n * - __fuzzyEmail__ - recognize emails without `mailto:` prefix.\n *\n **/\nfunction LinkifyIt(schemas, options) {\n  if (!(this instanceof LinkifyIt)) {\n    return new LinkifyIt(schemas, options);\n  }\n\n  if (!options) {\n    if (isOptionsObj(schemas)) {\n      options = schemas;\n      schemas = {};\n    }\n  }\n\n  this.__opts__           = assign({}, defaultOptions, options);\n\n  // Cache last tested result. Used to skip repeating steps on next `match` call.\n  this.__index__          = -1;\n  this.__last_index__     = -1; // Next scan position\n  this.__schema__         = '';\n  this.__text_cache__     = '';\n\n  this.__schemas__        = assign({}, defaultSchemas, schemas);\n  this.__compiled__       = {};\n\n  this.__tlds__           = tlds_default;\n  this.__tlds_replaced__  = false;\n\n  this.re = {};\n\n  compile(this);\n}\n\n\n/** chainable\n * LinkifyIt#add(schema, definition)\n * - schema (String): rule name (fixed pattern prefix)\n * - definition (String|RegExp|Object): schema definition\n *\n * Add new rule definition. See constructor description for details.\n **/\nLinkifyIt.prototype.add = function add(schema, definition) {\n  this.__schemas__[schema] = definition;\n  compile(this);\n  return this;\n};\n\n\n/** chainable\n * LinkifyIt#set(options)\n * - options (Object): { fuzzyLink|fuzzyEmail|fuzzyIP: true|false }\n *\n * Set recognition options for links without schema.\n **/\nLinkifyIt.prototype.set = function set(options) {\n  this.__opts__ = assign(this.__opts__, options);\n  return this;\n};\n\n\n/**\n * LinkifyIt#test(text) -> Boolean\n *\n * Searches linkifiable pattern and returns `true` on success or `false` on fail.\n **/\nLinkifyIt.prototype.test = function test(text) {\n  // Reset scan cache\n  this.__text_cache__ = text;\n  this.__index__      = -1;\n\n  if (!text.length) { return false; }\n\n  var m, ml, me, len, shift, next, re, tld_pos, at_pos;\n\n  // try to scan for link with schema - that's the most simple rule\n  if (this.re.schema_test.test(text)) {\n    re = this.re.schema_search;\n    re.lastIndex = 0;\n    while ((m = re.exec(text)) !== null) {\n      len = this.testSchemaAt(text, m[2], re.lastIndex);\n      if (len) {\n        this.__schema__     = m[2];\n        this.__index__      = m.index + m[1].length;\n        this.__last_index__ = m.index + m[0].length + len;\n        break;\n      }\n    }\n  }\n\n  if (this.__opts__.fuzzyLink && this.__compiled__['http:']) {\n    // guess schemaless links\n    tld_pos = text.search(this.re.host_fuzzy_test);\n    if (tld_pos >= 0) {\n      // if tld is located after found link - no need to check fuzzy pattern\n      if (this.__index__ < 0 || tld_pos < this.__index__) {\n        if ((ml = text.match(this.__opts__.fuzzyIP ? this.re.link_fuzzy : this.re.link_no_ip_fuzzy)) !== null) {\n\n          shift = ml.index + ml[1].length;\n\n          if (this.__index__ < 0 || shift < this.__index__) {\n            this.__schema__     = '';\n            this.__index__      = shift;\n            this.__last_index__ = ml.index + ml[0].length;\n          }\n        }\n      }\n    }\n  }\n\n  if (this.__opts__.fuzzyEmail && this.__compiled__['mailto:']) {\n    // guess schemaless emails\n    at_pos = text.indexOf('@');\n    if (at_pos >= 0) {\n      // We can't skip this check, because this cases are possible:\n      // 192.168.1.1@gmail.com, my.in@example.com\n      if ((me = text.match(this.re.email_fuzzy)) !== null) {\n\n        shift = me.index + me[1].length;\n        next  = me.index + me[0].length;\n\n        if (this.__index__ < 0 || shift < this.__index__ ||\n            (shift === this.__index__ && next > this.__last_index__)) {\n          this.__schema__     = 'mailto:';\n          this.__index__      = shift;\n          this.__last_index__ = next;\n        }\n      }\n    }\n  }\n\n  return this.__index__ >= 0;\n};\n\n\n/**\n * LinkifyIt#pretest(text) -> Boolean\n *\n * Very quick check, that can give false positives. Returns true if link MAY BE\n * can exists. Can be used for speed optimization, when you need to check that\n * link NOT exists.\n **/\nLinkifyIt.prototype.pretest = function pretest(text) {\n  return this.re.pretest.test(text);\n};\n\n\n/**\n * LinkifyIt#testSchemaAt(text, name, position) -> Number\n * - text (String): text to scan\n * - name (String): rule (schema) name\n * - position (Number): text offset to check from\n *\n * Similar to [[LinkifyIt#test]] but checks only specific protocol tail exactly\n * at given position. Returns length of found pattern (0 on fail).\n **/\nLinkifyIt.prototype.testSchemaAt = function testSchemaAt(text, schema, pos) {\n  // If not supported schema check requested - terminate\n  if (!this.__compiled__[schema.toLowerCase()]) {\n    return 0;\n  }\n  return this.__compiled__[schema.toLowerCase()].validate(text, pos, this);\n};\n\n\n/**\n * LinkifyIt#match(text) -> Array|null\n *\n * Returns array of found link descriptions or `null` on fail. We strongly\n * recommend to use [[LinkifyIt#test]] first, for best speed.\n *\n * ##### Result match description\n *\n * - __schema__ - link schema, can be empty for fuzzy links, or `//` for\n *   protocol-neutral  links.\n * - __index__ - offset of matched text\n * - __lastIndex__ - index of next char after mathch end\n * - __raw__ - matched text\n * - __text__ - normalized text\n * - __url__ - link, generated from matched text\n **/\nLinkifyIt.prototype.match = function match(text) {\n  var shift = 0, result = [];\n\n  // Try to take previous element from cache, if .test() called before\n  if (this.__index__ >= 0 && this.__text_cache__ === text) {\n    result.push(createMatch(this, shift));\n    shift = this.__last_index__;\n  }\n\n  // Cut head if cache was used\n  var tail = shift ? text.slice(shift) : text;\n\n  // Scan string until end reached\n  while (this.test(tail)) {\n    result.push(createMatch(this, shift));\n\n    tail = tail.slice(this.__last_index__);\n    shift += this.__last_index__;\n  }\n\n  if (result.length) {\n    return result;\n  }\n\n  return null;\n};\n\n\n/** chainable\n * LinkifyIt#tlds(list [, keepOld]) -> this\n * - list (Array): list of tlds\n * - keepOld (Boolean): merge with current list if `true` (`false` by default)\n *\n * Load (or merge) new tlds list. Those are user for fuzzy links (without prefix)\n * to avoid false positives. By default this algorythm used:\n *\n * - hostname with any 2-letter root zones are ok.\n * - biz|com|edu|gov|net|org|pro|web|xxx|aero|asia|coop|info|museum|name|shop|рф\n *   are ok.\n * - encoded (`xn--...`) root zones are ok.\n *\n * If list is replaced, then exact match for 2-chars root zones will be checked.\n **/\nLinkifyIt.prototype.tlds = function tlds(list, keepOld) {\n  list = Array.isArray(list) ? list : [ list ];\n\n  if (!keepOld) {\n    this.__tlds__ = list.slice();\n    this.__tlds_replaced__ = true;\n    compile(this);\n    return this;\n  }\n\n  this.__tlds__ = this.__tlds__.concat(list)\n                                  .sort()\n                                  .filter(function (el, idx, arr) {\n                                    return el !== arr[idx - 1];\n                                  })\n                                  .reverse();\n\n  compile(this);\n  return this;\n};\n\n/**\n * LinkifyIt#normalize(match)\n *\n * Default normalizer (if schema does not define it's own).\n **/\nLinkifyIt.prototype.normalize = function normalize(match) {\n\n  // Do minimal possible changes by default. Need to collect feedback prior\n  // to move forward https://github.com/markdown-it/linkify-it/issues/1\n\n  if (!match.schema) { match.url = 'http://' + match.url; }\n\n  if (match.schema === 'mailto:' && !/^mailto:/i.test(match.url)) {\n    match.url = 'mailto:' + match.url;\n  }\n};\n\n\n/**\n * LinkifyIt#onCompile()\n *\n * Override to modify basic RegExp-s.\n **/\nLinkifyIt.prototype.onCompile = function onCompile() {\n};\n\n\nmodule.exports = LinkifyIt;\n","'use strict';\n\n\nmodule.exports = function (opts) {\n  var re = {};\n\n  // Use direct extract instead of `regenerate` to reduse browserified size\n  re.src_Any = require('uc.micro/properties/Any/regex').source;\n  re.src_Cc  = require('uc.micro/categories/Cc/regex').source;\n  re.src_Z   = require('uc.micro/categories/Z/regex').source;\n  re.src_P   = require('uc.micro/categories/P/regex').source;\n\n  // \\p{\\Z\\P\\Cc\\CF} (white spaces + control + format + punctuation)\n  re.src_ZPCc = [ re.src_Z, re.src_P, re.src_Cc ].join('|');\n\n  // \\p{\\Z\\Cc} (white spaces + control)\n  re.src_ZCc = [ re.src_Z, re.src_Cc ].join('|');\n\n  // Experimental. List of chars, completely prohibited in links\n  // because can separate it from other part of text\n  var text_separators = '[><\\uff5c]';\n\n  // All possible word characters (everything without punctuation, spaces & controls)\n  // Defined via punctuation & spaces to save space\n  // Should be something like \\p{\\L\\N\\S\\M} (\\w but without `_`)\n  re.src_pseudo_letter       = '(?:(?!' + text_separators + '|' + re.src_ZPCc + ')' + re.src_Any + ')';\n  // The same as abothe but without [0-9]\n  // var src_pseudo_letter_non_d = '(?:(?![0-9]|' + src_ZPCc + ')' + src_Any + ')';\n\n  ////////////////////////////////////////////////////////////////////////////////\n\n  re.src_ip4 =\n\n    '(?:(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)\\\\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9][0-9]?)';\n\n  // Prohibit any of \"@/[]()\" in user/pass to avoid wrong domain fetch.\n  re.src_auth    = '(?:(?:(?!' + re.src_ZCc + '|[@/\\\\[\\\\]()]).)+@)?';\n\n  re.src_port =\n\n    '(?::(?:6(?:[0-4]\\\\d{3}|5(?:[0-4]\\\\d{2}|5(?:[0-2]\\\\d|3[0-5])))|[1-5]?\\\\d{1,4}))?';\n\n  re.src_host_terminator =\n\n    '(?=$|' + text_separators + '|' + re.src_ZPCc + ')(?!-|_|:\\\\d|\\\\.-|\\\\.(?!$|' + re.src_ZPCc + '))';\n\n  re.src_path =\n\n    '(?:' +\n      '[/?#]' +\n        '(?:' +\n          '(?!' + re.src_ZCc + '|' + text_separators + '|[()[\\\\]{}.,\"\\'?!\\\\-]).|' +\n          '\\\\[(?:(?!' + re.src_ZCc + '|\\\\]).)*\\\\]|' +\n          '\\\\((?:(?!' + re.src_ZCc + '|[)]).)*\\\\)|' +\n          '\\\\{(?:(?!' + re.src_ZCc + '|[}]).)*\\\\}|' +\n          '\\\\\"(?:(?!' + re.src_ZCc + '|[\"]).)+\\\\\"|' +\n          \"\\\\'(?:(?!\" + re.src_ZCc + \"|[']).)+\\\\'|\" +\n          \"\\\\'(?=\" + re.src_pseudo_letter + '|[-]).|' +  // allow `I'm_king` if no pair found\n          '\\\\.{2,3}[a-zA-Z0-9%/]|' + // github has ... in commit range links. Restrict to\n                                     // - english\n                                     // - percent-encoded\n                                     // - parts of file path\n                                     // until more examples found.\n          '\\\\.(?!' + re.src_ZCc + '|[.]).|' +\n          (opts && opts['---'] ?\n            '\\\\-(?!--(?:[^-]|$))(?:-*)|' // `---` => long dash, terminate\n          :\n            '\\\\-+|'\n          ) +\n          '\\\\,(?!' + re.src_ZCc + ').|' +      // allow `,,,` in paths\n          '\\\\!(?!' + re.src_ZCc + '|[!]).|' +\n          '\\\\?(?!' + re.src_ZCc + '|[?]).' +\n        ')+' +\n      '|\\\\/' +\n    ')?';\n\n  re.src_email_name =\n\n    '[\\\\-;:&=\\\\+\\\\$,\\\\\"\\\\.a-zA-Z0-9_]+';\n\n  re.src_xn =\n\n    'xn--[a-z0-9\\\\-]{1,59}';\n\n  // More to read about domain names\n  // http://serverfault.com/questions/638260/\n\n  re.src_domain_root =\n\n    // Allow letters & digits (http://test1)\n    '(?:' +\n      re.src_xn +\n      '|' +\n      re.src_pseudo_letter + '{1,63}' +\n    ')';\n\n  re.src_domain =\n\n    '(?:' +\n      re.src_xn +\n      '|' +\n      '(?:' + re.src_pseudo_letter + ')' +\n      '|' +\n      // don't allow `--` in domain names, because:\n      // - that can conflict with markdown &mdash; / &ndash;\n      // - nobody use those anyway\n      '(?:' + re.src_pseudo_letter + '(?:-(?!-)|' + re.src_pseudo_letter + '){0,61}' + re.src_pseudo_letter + ')' +\n    ')';\n\n  re.src_host =\n\n    '(?:' +\n    // Don't need IP check, because digits are already allowed in normal domain names\n    //   src_ip4 +\n    // '|' +\n      '(?:(?:(?:' + re.src_domain + ')\\\\.)*' + re.src_domain/*_root*/ + ')' +\n    ')';\n\n  re.tpl_host_fuzzy =\n\n    '(?:' +\n      re.src_ip4 +\n    '|' +\n      '(?:(?:(?:' + re.src_domain + ')\\\\.)+(?:%TLDS%))' +\n    ')';\n\n  re.tpl_host_no_ip_fuzzy =\n\n    '(?:(?:(?:' + re.src_domain + ')\\\\.)+(?:%TLDS%))';\n\n  re.src_host_strict =\n\n    re.src_host + re.src_host_terminator;\n\n  re.tpl_host_fuzzy_strict =\n\n    re.tpl_host_fuzzy + re.src_host_terminator;\n\n  re.src_host_port_strict =\n\n    re.src_host + re.src_port + re.src_host_terminator;\n\n  re.tpl_host_port_fuzzy_strict =\n\n    re.tpl_host_fuzzy + re.src_port + re.src_host_terminator;\n\n  re.tpl_host_port_no_ip_fuzzy_strict =\n\n    re.tpl_host_no_ip_fuzzy + re.src_port + re.src_host_terminator;\n\n\n  ////////////////////////////////////////////////////////////////////////////////\n  // Main rules\n\n  // Rude test fuzzy links by host, for quick deny\n  re.tpl_host_fuzzy_test =\n\n    'localhost|www\\\\.|\\\\.\\\\d{1,3}\\\\.|(?:\\\\.(?:%TLDS%)(?:' + re.src_ZPCc + '|>|$))';\n\n  re.tpl_email_fuzzy =\n\n      '(^|' + text_separators + '|\\\\(|' + re.src_ZCc + ')(' + re.src_email_name + '@' + re.tpl_host_fuzzy_strict + ')';\n\n  re.tpl_link_fuzzy =\n      // Fuzzy link can't be prepended with .:/\\- and non punctuation.\n      // but can start with > (markdown blockquote)\n      '(^|(?![.:/\\\\-_@])(?:[$+<=>^`|\\uff5c]|' + re.src_ZPCc + '))' +\n      '((?![$+<=>^`|\\uff5c])' + re.tpl_host_port_fuzzy_strict + re.src_path + ')';\n\n  re.tpl_link_no_ip_fuzzy =\n      // Fuzzy link can't be prepended with .:/\\- and non punctuation.\n      // but can start with > (markdown blockquote)\n      '(^|(?![.:/\\\\-_@])(?:[$+<=>^`|\\uff5c]|' + re.src_ZPCc + '))' +\n      '((?![$+<=>^`|\\uff5c])' + re.tpl_host_port_no_ip_fuzzy_strict + re.src_path + ')';\n\n  return re;\n};\n","/*! https://mths.be/punycode v1.4.1 by @mathias */\n;(function(root) {\n\n\t/** Detect free variables */\n\tvar freeExports = typeof exports == 'object' && exports &&\n\t\t!exports.nodeType && exports;\n\tvar freeModule = typeof module == 'object' && module &&\n\t\t!module.nodeType && module;\n\tvar freeGlobal = typeof global == 'object' && global;\n\tif (\n\t\tfreeGlobal.global === freeGlobal ||\n\t\tfreeGlobal.window === freeGlobal ||\n\t\tfreeGlobal.self === freeGlobal\n\t) {\n\t\troot = freeGlobal;\n\t}\n\n\t/**\n\t * The `punycode` object.\n\t * @name punycode\n\t * @type Object\n\t */\n\tvar punycode,\n\n\t/** Highest positive signed 32-bit float value */\n\tmaxInt = 2147483647, // aka. 0x7FFFFFFF or 2^31-1\n\n\t/** Bootstring parameters */\n\tbase = 36,\n\ttMin = 1,\n\ttMax = 26,\n\tskew = 38,\n\tdamp = 700,\n\tinitialBias = 72,\n\tinitialN = 128, // 0x80\n\tdelimiter = '-', // '\\x2D'\n\n\t/** Regular expressions */\n\tregexPunycode = /^xn--/,\n\tregexNonASCII = /[^\\x20-\\x7E]/, // unprintable ASCII chars + non-ASCII chars\n\tregexSeparators = /[\\x2E\\u3002\\uFF0E\\uFF61]/g, // RFC 3490 separators\n\n\t/** Error messages */\n\terrors = {\n\t\t'overflow': 'Overflow: input needs wider integers to process',\n\t\t'not-basic': 'Illegal input >= 0x80 (not a basic code point)',\n\t\t'invalid-input': 'Invalid input'\n\t},\n\n\t/** Convenience shortcuts */\n\tbaseMinusTMin = base - tMin,\n\tfloor = Math.floor,\n\tstringFromCharCode = String.fromCharCode,\n\n\t/** Temporary variable */\n\tkey;\n\n\t/*--------------------------------------------------------------------------*/\n\n\t/**\n\t * A generic error utility function.\n\t * @private\n\t * @param {String} type The error type.\n\t * @returns {Error} Throws a `RangeError` with the applicable error message.\n\t */\n\tfunction error(type) {\n\t\tthrow new RangeError(errors[type]);\n\t}\n\n\t/**\n\t * A generic `Array#map` utility function.\n\t * @private\n\t * @param {Array} array The array to iterate over.\n\t * @param {Function} callback The function that gets called for every array\n\t * item.\n\t * @returns {Array} A new array of values returned by the callback function.\n\t */\n\tfunction map(array, fn) {\n\t\tvar length = array.length;\n\t\tvar result = [];\n\t\twhile (length--) {\n\t\t\tresult[length] = fn(array[length]);\n\t\t}\n\t\treturn result;\n\t}\n\n\t/**\n\t * A simple `Array#map`-like wrapper to work with domain name strings or email\n\t * addresses.\n\t * @private\n\t * @param {String} domain The domain name or email address.\n\t * @param {Function} callback The function that gets called for every\n\t * character.\n\t * @returns {Array} A new string of characters returned by the callback\n\t * function.\n\t */\n\tfunction mapDomain(string, fn) {\n\t\tvar parts = string.split('@');\n\t\tvar result = '';\n\t\tif (parts.length > 1) {\n\t\t\t// In email addresses, only the domain name should be punycoded. Leave\n\t\t\t// the local part (i.e. everything up to `@`) intact.\n\t\t\tresult = parts[0] + '@';\n\t\t\tstring = parts[1];\n\t\t}\n\t\t// Avoid `split(regex)` for IE8 compatibility. See #17.\n\t\tstring = string.replace(regexSeparators, '\\x2E');\n\t\tvar labels = string.split('.');\n\t\tvar encoded = map(labels, fn).join('.');\n\t\treturn result + encoded;\n\t}\n\n\t/**\n\t * Creates an array containing the numeric code points of each Unicode\n\t * character in the string. While JavaScript uses UCS-2 internally,\n\t * this function will convert a pair of surrogate halves (each of which\n\t * UCS-2 exposes as separate characters) into a single code point,\n\t * matching UTF-16.\n\t * @see `punycode.ucs2.encode`\n\t * @see <https://mathiasbynens.be/notes/javascript-encoding>\n\t * @memberOf punycode.ucs2\n\t * @name decode\n\t * @param {String} string The Unicode input string (UCS-2).\n\t * @returns {Array} The new array of code points.\n\t */\n\tfunction ucs2decode(string) {\n\t\tvar output = [],\n\t\t    counter = 0,\n\t\t    length = string.length,\n\t\t    value,\n\t\t    extra;\n\t\twhile (counter < length) {\n\t\t\tvalue = string.charCodeAt(counter++);\n\t\t\tif (value >= 0xD800 && value <= 0xDBFF && counter < length) {\n\t\t\t\t// high surrogate, and there is a next character\n\t\t\t\textra = string.charCodeAt(counter++);\n\t\t\t\tif ((extra & 0xFC00) == 0xDC00) { // low surrogate\n\t\t\t\t\toutput.push(((value & 0x3FF) << 10) + (extra & 0x3FF) + 0x10000);\n\t\t\t\t} else {\n\t\t\t\t\t// unmatched surrogate; only append this code unit, in case the next\n\t\t\t\t\t// code unit is the high surrogate of a surrogate pair\n\t\t\t\t\toutput.push(value);\n\t\t\t\t\tcounter--;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\toutput.push(value);\n\t\t\t}\n\t\t}\n\t\treturn output;\n\t}\n\n\t/**\n\t * Creates a string based on an array of numeric code points.\n\t * @see `punycode.ucs2.decode`\n\t * @memberOf punycode.ucs2\n\t * @name encode\n\t * @param {Array} codePoints The array of numeric code points.\n\t * @returns {String} The new Unicode string (UCS-2).\n\t */\n\tfunction ucs2encode(array) {\n\t\treturn map(array, function(value) {\n\t\t\tvar output = '';\n\t\t\tif (value > 0xFFFF) {\n\t\t\t\tvalue -= 0x10000;\n\t\t\t\toutput += stringFromCharCode(value >>> 10 & 0x3FF | 0xD800);\n\t\t\t\tvalue = 0xDC00 | value & 0x3FF;\n\t\t\t}\n\t\t\toutput += stringFromCharCode(value);\n\t\t\treturn output;\n\t\t}).join('');\n\t}\n\n\t/**\n\t * Converts a basic code point into a digit/integer.\n\t * @see `digitToBasic()`\n\t * @private\n\t * @param {Number} codePoint The basic numeric code point value.\n\t * @returns {Number} The numeric value of a basic code point (for use in\n\t * representing integers) in the range `0` to `base - 1`, or `base` if\n\t * the code point does not represent a value.\n\t */\n\tfunction basicToDigit(codePoint) {\n\t\tif (codePoint - 48 < 10) {\n\t\t\treturn codePoint - 22;\n\t\t}\n\t\tif (codePoint - 65 < 26) {\n\t\t\treturn codePoint - 65;\n\t\t}\n\t\tif (codePoint - 97 < 26) {\n\t\t\treturn codePoint - 97;\n\t\t}\n\t\treturn base;\n\t}\n\n\t/**\n\t * Converts a digit/integer into a basic code point.\n\t * @see `basicToDigit()`\n\t * @private\n\t * @param {Number} digit The numeric value of a basic code point.\n\t * @returns {Number} The basic code point whose value (when used for\n\t * representing integers) is `digit`, which needs to be in the range\n\t * `0` to `base - 1`. If `flag` is non-zero, the uppercase form is\n\t * used; else, the lowercase form is used. The behavior is undefined\n\t * if `flag` is non-zero and `digit` has no uppercase form.\n\t */\n\tfunction digitToBasic(digit, flag) {\n\t\t//  0..25 map to ASCII a..z or A..Z\n\t\t// 26..35 map to ASCII 0..9\n\t\treturn digit + 22 + 75 * (digit < 26) - ((flag != 0) << 5);\n\t}\n\n\t/**\n\t * Bias adaptation function as per section 3.4 of RFC 3492.\n\t * https://tools.ietf.org/html/rfc3492#section-3.4\n\t * @private\n\t */\n\tfunction adapt(delta, numPoints, firstTime) {\n\t\tvar k = 0;\n\t\tdelta = firstTime ? floor(delta / damp) : delta >> 1;\n\t\tdelta += floor(delta / numPoints);\n\t\tfor (/* no initialization */; delta > baseMinusTMin * tMax >> 1; k += base) {\n\t\t\tdelta = floor(delta / baseMinusTMin);\n\t\t}\n\t\treturn floor(k + (baseMinusTMin + 1) * delta / (delta + skew));\n\t}\n\n\t/**\n\t * Converts a Punycode string of ASCII-only symbols to a string of Unicode\n\t * symbols.\n\t * @memberOf punycode\n\t * @param {String} input The Punycode string of ASCII-only symbols.\n\t * @returns {String} The resulting string of Unicode symbols.\n\t */\n\tfunction decode(input) {\n\t\t// Don't use UCS-2\n\t\tvar output = [],\n\t\t    inputLength = input.length,\n\t\t    out,\n\t\t    i = 0,\n\t\t    n = initialN,\n\t\t    bias = initialBias,\n\t\t    basic,\n\t\t    j,\n\t\t    index,\n\t\t    oldi,\n\t\t    w,\n\t\t    k,\n\t\t    digit,\n\t\t    t,\n\t\t    /** Cached calculation results */\n\t\t    baseMinusT;\n\n\t\t// Handle the basic code points: let `basic` be the number of input code\n\t\t// points before the last delimiter, or `0` if there is none, then copy\n\t\t// the first basic code points to the output.\n\n\t\tbasic = input.lastIndexOf(delimiter);\n\t\tif (basic < 0) {\n\t\t\tbasic = 0;\n\t\t}\n\n\t\tfor (j = 0; j < basic; ++j) {\n\t\t\t// if it's not a basic code point\n\t\t\tif (input.charCodeAt(j) >= 0x80) {\n\t\t\t\terror('not-basic');\n\t\t\t}\n\t\t\toutput.push(input.charCodeAt(j));\n\t\t}\n\n\t\t// Main decoding loop: start just after the last delimiter if any basic code\n\t\t// points were copied; start at the beginning otherwise.\n\n\t\tfor (index = basic > 0 ? basic + 1 : 0; index < inputLength; /* no final expression */) {\n\n\t\t\t// `index` is the index of the next character to be consumed.\n\t\t\t// Decode a generalized variable-length integer into `delta`,\n\t\t\t// which gets added to `i`. The overflow checking is easier\n\t\t\t// if we increase `i` as we go, then subtract off its starting\n\t\t\t// value at the end to obtain `delta`.\n\t\t\tfor (oldi = i, w = 1, k = base; /* no condition */; k += base) {\n\n\t\t\t\tif (index >= inputLength) {\n\t\t\t\t\terror('invalid-input');\n\t\t\t\t}\n\n\t\t\t\tdigit = basicToDigit(input.charCodeAt(index++));\n\n\t\t\t\tif (digit >= base || digit > floor((maxInt - i) / w)) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\ti += digit * w;\n\t\t\t\tt = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);\n\n\t\t\t\tif (digit < t) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tbaseMinusT = base - t;\n\t\t\t\tif (w > floor(maxInt / baseMinusT)) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\tw *= baseMinusT;\n\n\t\t\t}\n\n\t\t\tout = output.length + 1;\n\t\t\tbias = adapt(i - oldi, out, oldi == 0);\n\n\t\t\t// `i` was supposed to wrap around from `out` to `0`,\n\t\t\t// incrementing `n` each time, so we'll fix that now:\n\t\t\tif (floor(i / out) > maxInt - n) {\n\t\t\t\terror('overflow');\n\t\t\t}\n\n\t\t\tn += floor(i / out);\n\t\t\ti %= out;\n\n\t\t\t// Insert `n` at position `i` of the output\n\t\t\toutput.splice(i++, 0, n);\n\n\t\t}\n\n\t\treturn ucs2encode(output);\n\t}\n\n\t/**\n\t * Converts a string of Unicode symbols (e.g. a domain name label) to a\n\t * Punycode string of ASCII-only symbols.\n\t * @memberOf punycode\n\t * @param {String} input The string of Unicode symbols.\n\t * @returns {String} The resulting Punycode string of ASCII-only symbols.\n\t */\n\tfunction encode(input) {\n\t\tvar n,\n\t\t    delta,\n\t\t    handledCPCount,\n\t\t    basicLength,\n\t\t    bias,\n\t\t    j,\n\t\t    m,\n\t\t    q,\n\t\t    k,\n\t\t    t,\n\t\t    currentValue,\n\t\t    output = [],\n\t\t    /** `inputLength` will hold the number of code points in `input`. */\n\t\t    inputLength,\n\t\t    /** Cached calculation results */\n\t\t    handledCPCountPlusOne,\n\t\t    baseMinusT,\n\t\t    qMinusT;\n\n\t\t// Convert the input in UCS-2 to Unicode\n\t\tinput = ucs2decode(input);\n\n\t\t// Cache the length\n\t\tinputLength = input.length;\n\n\t\t// Initialize the state\n\t\tn = initialN;\n\t\tdelta = 0;\n\t\tbias = initialBias;\n\n\t\t// Handle the basic code points\n\t\tfor (j = 0; j < inputLength; ++j) {\n\t\t\tcurrentValue = input[j];\n\t\t\tif (currentValue < 0x80) {\n\t\t\t\toutput.push(stringFromCharCode(currentValue));\n\t\t\t}\n\t\t}\n\n\t\thandledCPCount = basicLength = output.length;\n\n\t\t// `handledCPCount` is the number of code points that have been handled;\n\t\t// `basicLength` is the number of basic code points.\n\n\t\t// Finish the basic string - if it is not empty - with a delimiter\n\t\tif (basicLength) {\n\t\t\toutput.push(delimiter);\n\t\t}\n\n\t\t// Main encoding loop:\n\t\twhile (handledCPCount < inputLength) {\n\n\t\t\t// All non-basic code points < n have been handled already. Find the next\n\t\t\t// larger one:\n\t\t\tfor (m = maxInt, j = 0; j < inputLength; ++j) {\n\t\t\t\tcurrentValue = input[j];\n\t\t\t\tif (currentValue >= n && currentValue < m) {\n\t\t\t\t\tm = currentValue;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Increase `delta` enough to advance the decoder's <n,i> state to <m,0>,\n\t\t\t// but guard against overflow\n\t\t\thandledCPCountPlusOne = handledCPCount + 1;\n\t\t\tif (m - n > floor((maxInt - delta) / handledCPCountPlusOne)) {\n\t\t\t\terror('overflow');\n\t\t\t}\n\n\t\t\tdelta += (m - n) * handledCPCountPlusOne;\n\t\t\tn = m;\n\n\t\t\tfor (j = 0; j < inputLength; ++j) {\n\t\t\t\tcurrentValue = input[j];\n\n\t\t\t\tif (currentValue < n && ++delta > maxInt) {\n\t\t\t\t\terror('overflow');\n\t\t\t\t}\n\n\t\t\t\tif (currentValue == n) {\n\t\t\t\t\t// Represent delta as a generalized variable-length integer\n\t\t\t\t\tfor (q = delta, k = base; /* no condition */; k += base) {\n\t\t\t\t\t\tt = k <= bias ? tMin : (k >= bias + tMax ? tMax : k - bias);\n\t\t\t\t\t\tif (q < t) {\n\t\t\t\t\t\t\tbreak;\n\t\t\t\t\t\t}\n\t\t\t\t\t\tqMinusT = q - t;\n\t\t\t\t\t\tbaseMinusT = base - t;\n\t\t\t\t\t\toutput.push(\n\t\t\t\t\t\t\tstringFromCharCode(digitToBasic(t + qMinusT % baseMinusT, 0))\n\t\t\t\t\t\t);\n\t\t\t\t\t\tq = floor(qMinusT / baseMinusT);\n\t\t\t\t\t}\n\n\t\t\t\t\toutput.push(stringFromCharCode(digitToBasic(q, 0)));\n\t\t\t\t\tbias = adapt(delta, handledCPCountPlusOne, handledCPCount == basicLength);\n\t\t\t\t\tdelta = 0;\n\t\t\t\t\t++handledCPCount;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t++delta;\n\t\t\t++n;\n\n\t\t}\n\t\treturn output.join('');\n\t}\n\n\t/**\n\t * Converts a Punycode string representing a domain name or an email address\n\t * to Unicode. Only the Punycoded parts of the input will be converted, i.e.\n\t * it doesn't matter if you call it on a string that has already been\n\t * converted to Unicode.\n\t * @memberOf punycode\n\t * @param {String} input The Punycoded domain name or email address to\n\t * convert to Unicode.\n\t * @returns {String} The Unicode representation of the given Punycode\n\t * string.\n\t */\n\tfunction toUnicode(input) {\n\t\treturn mapDomain(input, function(string) {\n\t\t\treturn regexPunycode.test(string)\n\t\t\t\t? decode(string.slice(4).toLowerCase())\n\t\t\t\t: string;\n\t\t});\n\t}\n\n\t/**\n\t * Converts a Unicode string representing a domain name or an email address to\n\t * Punycode. 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});\n}","module.exports = \":root{--ck-color-table-focused-cell-background:#f5fafe}.ck-widget.table td.ck-editor__nested-editable.ck-editor__nested-editable_focused,.ck-widget.table th.ck-editor__nested-editable.ck-editor__nested-editable_focused{background:var(--ck-color-table-focused-cell-background);border-style:none;outline:1px solid var(--ck-color-focus-border);outline-offset:-1px}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./inserttable.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./inserttable.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./inserttable.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \":root{--ck-insert-table-dropdown-padding:10px;--ck-insert-table-dropdown-box-height:11px;--ck-insert-table-dropdown-box-width:12px;--ck-insert-table-dropdown-box-margin:1px;--ck-insert-table-dropdown-box-border-color:#bfbfbf;--ck-insert-table-dropdown-box-border-active-color:#53a0e4;--ck-insert-table-dropdown-box-active-background:#c7e5ff}.ck .ck-insert-table-dropdown__grid{display:flex;flex-direction:row;flex-wrap:wrap;width:calc(var(--ck-insert-table-dropdown-box-width) * 10 + var(--ck-insert-table-dropdown-box-margin) * 20 + var(--ck-insert-table-dropdown-padding) * 2);padding:var(--ck-insert-table-dropdown-padding) var(--ck-insert-table-dropdown-padding) 0}.ck .ck-insert-table-dropdown__label{text-align:center}.ck .ck-insert-table-dropdown-grid-box{width:var(--ck-insert-table-dropdown-box-width);height:var(--ck-insert-table-dropdown-box-height);margin:var(--ck-insert-table-dropdown-box-margin);border:1px solid var(--ck-insert-table-dropdown-box-border-color);border-radius:1px}.ck .ck-insert-table-dropdown-grid-box.ck-on{border-color:var(--ck-insert-table-dropdown-box-border-active-color);background:var(--ck-insert-table-dropdown-box-active-background)}\"","\nvar content = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./table.css\");\n\nif(typeof content === 'string') content = [[module.id, content, '']];\n\nvar transform;\nvar insertInto;\n\n\n\nvar options = {\"singleton\":true,\"hmr\":true}\n\noptions.transform = transform\noptions.insertInto = undefined;\n\nvar update = require(\"!../../../style-loader/lib/addStyles.js\")(content, options);\n\nif(content.locals) module.exports = content.locals;\n\nif(module.hot) {\n\tmodule.hot.accept(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./table.css\", function() {\n\t\tvar newContent = require(\"!!../../../postcss-loader/lib/index.js??ref--5-1!./table.css\");\n\n\t\tif(typeof newContent === 'string') newContent = [[module.id, newContent, '']];\n\n\t\tvar locals = (function(a, b) {\n\t\t\tvar key, idx = 0;\n\n\t\t\tfor(key in a) {\n\t\t\t\tif(!b || a[key] !== b[key]) return false;\n\t\t\t\tidx++;\n\t\t\t}\n\n\t\t\tfor(key in b) idx--;\n\n\t\t\treturn idx === 0;\n\t\t}(content.locals, newContent.locals));\n\n\t\tif(!locals) throw new Error('Aborting CSS HMR due to changed css-modules locals.');\n\n\t\tupdate(newContent);\n\t});\n\n\tmodule.hot.dispose(function() { update(); });\n}","module.exports = \".ck-content .table{margin:1em auto;display:table}.ck-content .table table{border-collapse:collapse;border-spacing:0;border:1px double #b3b3b3}.ck-content .table table td,.ck-content .table table th{min-width:2em;padding:.4em;text-align:center;border-color:#d9d9d9}.ck-content .table table th{font-weight:700;background:#fafafa}\"","/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeGetPrototype = Object.getPrototypeOf;\n\n/**\n * Gets the `[[Prototype]]` of `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {null|Object} Returns the `[[Prototype]]`.\n */\nfunction getPrototype(value) {\n  return nativeGetPrototype(Object(value));\n}\n\nexport default getPrototype;\n","/**\n * Checks if `value` is a host object in IE < 9.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a host object, else `false`.\n */\nfunction isHostObject(value) {\n  // Many host objects are `Object` objects that can coerce to strings\n  // despite having improperly defined `toString` methods.\n  var result = false;\n  if (value != null && typeof value.toString != 'function') {\n    try {\n      result = !!(value + '');\n    } catch (e) {}\n  }\n  return result;\n}\n\nexport default isHostObject;\n","/**\n * Checks if `value` is object-like. A value is object-like if it's not `null`\n * and has a `typeof` result of \"object\".\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is object-like, else `false`.\n * @example\n *\n * _.isObjectLike({});\n * // => true\n *\n * _.isObjectLike([1, 2, 3]);\n * // => true\n *\n * _.isObjectLike(_.noop);\n * // => false\n *\n * _.isObjectLike(null);\n * // => false\n */\nfunction isObjectLike(value) {\n  return !!value && typeof value == 'object';\n}\n\nexport default isObjectLike;\n","import getPrototype from './_getPrototype';\nimport isHostObject from './_isHostObject';\nimport isObjectLike from './isObjectLike';\n\n/** `Object#toString` result references. */\nvar objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = Function.prototype.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to infer the `Object` constructor. */\nvar objectCtorString = funcToString.call(Object);\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/**\n * Checks if `value` is a plain object, that is, an object created by the\n * `Object` constructor or one with a `[[Prototype]]` of `null`.\n *\n * @static\n * @memberOf _\n * @since 0.8.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a plain object,\n *  else `false`.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n * }\n *\n * _.isPlainObject(new Foo);\n * // => false\n *\n * _.isPlainObject([1, 2, 3]);\n * // => false\n *\n * _.isPlainObject({ 'x': 0, 'y': 0 });\n * // => true\n *\n * _.isPlainObject(Object.create(null));\n * // => true\n */\nfunction isPlainObject(value) {\n  if (!isObjectLike(value) ||\n      objectToString.call(value) != objectTag || isHostObject(value)) {\n    return false;\n  }\n  var proto = getPrototype(value);\n  if (proto === null) {\n    return true;\n  }\n  var Ctor = hasOwnProperty.call(proto, 'constructor') && proto.constructor;\n  return (typeof Ctor == 'function' &&\n    Ctor instanceof Ctor && funcToString.call(Ctor) == objectCtorString);\n}\n\nexport default isPlainObject;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/config\n */\n\nimport isPlainObject from './lib/lodash/isPlainObject';\n\n/**\n * Handles a configuration dictionary.\n */\nexport default class Config {\n\t/**\n\t * Creates an instance of the {@link ~Config} class.\n\t *\n\t * @param {Object} [configurations] The initial configurations to be set. Usually, provided by the user.\n\t * @param {Object} [defaultConfigurations] The default configurations. Usually, provided by the system.\n\t */\n\tconstructor( configurations, defaultConfigurations ) {\n\t\t/**\n\t\t * Store for the whole configuration.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {};\n\n\t\t// Set default configuration.\n\t\tif ( defaultConfigurations ) {\n\t\t\tthis.define( defaultConfigurations );\n\t\t}\n\n\t\t// Set initial configuration.\n\t\tif ( configurations ) {\n\t\t\tthis._setObjectToTarget( this._config, configurations );\n\t\t}\n\t}\n\n\t/**\n\t * Set configuration values.\n\t *\n\t * It accepts both a name/value pair or an object, which properties and values will be used to set\n\t * configurations.\n\t *\n\t * It also accepts setting a \"deep configuration\" by using dots in the name. For example, `'resize.width'` sets\n\t * the value for the `width` configuration in the `resize` subset.\n\t *\n\t *\t\tconfig.set( 'width', 500 );\n\t *\t\tconfig.set( 'toolbar.collapsed', true );\n\t *\n\t *\t\t// Equivalent to:\n\t *\t\tconfig.set( {\n\t *\t\t\twidth: 500\n\t *\t\t\ttoolbar: {\n\t *\t\t\t\tcollapsed: true\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Passing an object as the value will amend the configuration, not replace it.\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcollapsed: true,\n\t *\t\t} );\n\t *\n\t *\t\tconfig.set( 'toolbar', {\n\t *\t\t\tcolor: 'red',\n\t *\t\t} );\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' ); // true\n\t *\t\tconfig.get( 'toolbar.color' ); // 'red'\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tset( name, value ) {\n\t\tthis._setToTarget( this._config, name, value );\n\t}\n\n\t/**\n\t * Does exactly the same as {@link #set} with one exception – passed configuration extends\n\t * existing one, but does not overwrite already defined values.\n\t *\n\t * This method is supposed to be called by plugin developers to setup plugin's configurations. It would be\n\t * rarely used for other needs.\n\t *\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t */\n\tdefine( name, value ) {\n\t\tconst isDefine = true;\n\n\t\tthis._setToTarget( this._config, name, value, isDefine );\n\t}\n\n\t/**\n\t * Gets the value for a configuration entry.\n\t *\n\t *\t\tconfig.get( 'name' );\n\t *\n\t * Deep configurations can be retrieved by separating each part with a dot.\n\t *\n\t *\t\tconfig.get( 'toolbar.collapsed' );\n\t *\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\tget( name ) {\n\t\treturn this._getFromSource( this._config, name );\n\t}\n\n\t/**\n\t * Saves passed configuration to the specified target (nested object).\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {String|Object} name The configuration name or an object from which take properties as\n\t * configuration entries. Configuration names are case-sensitive.\n\t * @param {*} value The configuration value. Used if a name is passed.\n\t * @param {Boolean} [isDefine=false] Define if passed configuration should overwrite existing one.\n\t */\n\t_setToTarget( target, name, value, isDefine = false ) {\n\t\t// In case of an object, iterate through it and call `_setToTarget` again for each property.\n\t\tif ( isPlainObject( name ) ) {\n\t\t\tthis._setObjectToTarget( target, name, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\t// If there is no object for specified part then create one.\n\t\t\tif ( !isPlainObject( target[ part ] ) ) {\n\t\t\t\ttarget[ part ] = {};\n\t\t\t}\n\n\t\t\t// Nested object becomes a target.\n\t\t\ttarget = target[ part ];\n\t\t}\n\n\t\t// In case of value is an object.\n\t\tif ( isPlainObject( value ) ) {\n\t\t\t// We take care of proper config structure.\n\t\t\tif ( !isPlainObject( target[ name ] ) ) {\n\t\t\t\ttarget[ name ] = {};\n\t\t\t}\n\n\t\t\ttarget = target[ name ];\n\n\t\t\t// And iterate through this object calling `_setToTarget` again for each property.\n\t\t\tthis._setObjectToTarget( target, value, isDefine );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Do nothing if we are defining configuration for non empty name.\n\t\tif ( isDefine && typeof target[ name ] != 'undefined' ) {\n\t\t\treturn;\n\t\t}\n\n\t\ttarget[ name ] = value;\n\t}\n\n\t/**\n\t * Get specified configuration from specified source (nested object).\n\t *\n\t * @private\n\t * @param {Object} source level of nested object.\n\t * @param {String} name The configuration name. Configuration names are case-sensitive.\n\t * @returns {*} The configuration value or `undefined` if the configuration entry was not found.\n\t */\n\t_getFromSource( source, name ) {\n\t\t// The configuration name should be split into parts if it has dots. E.g. `resize.width` -> [`resize`, `width`].\n\t\tconst parts = name.split( '.' );\n\n\t\t// Take the name of the configuration out of the parts. E.g. `resize.width` -> `width`.\n\t\tname = parts.pop();\n\n\t\t// Iterate over parts to check if currently stored configuration has proper structure.\n\t\tfor ( const part of parts ) {\n\t\t\tif ( !isPlainObject( source[ part ] ) ) {\n\t\t\t\tsource = null;\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Nested object becomes a source.\n\t\t\tsource = source[ part ];\n\t\t}\n\n\t\t// Always returns undefined for non existing configuration\n\t\treturn source ? source[ name ] : undefined;\n\t}\n\n\t/**\n\t * Iterates through passed object and calls {@link #_setToTarget} method with object key and value for each property.\n\t *\n\t * @private\n\t * @param {Object} target Nested config object.\n\t * @param {Object} configuration Configuration data set\n\t * @param {Boolean} [isDefine] Defines if passed configuration is default configuration or not.\n\t */\n\t_setObjectToTarget( target, configuration, isDefine ) {\n\t\tObject.keys( configuration ).forEach( key => {\n\t\t\tthis._setToTarget( target, key, configuration[ key ], isDefine );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/spy\n */\n\n/**\n * Creates a spy function (ala Sinon.js) that can be used to inspect call to it.\n *\n * The following are the present features:\n *\n * * spy.called: property set to `true` if the function has been called at least once.\n *\n * @returns {Function} The spy function.\n */\nfunction spy() {\n\treturn function spy() {\n\t\tspy.called = true;\n\t};\n}\n\nexport default spy;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/eventinfo\n */\n\nimport spy from './spy';\n\n/**\n * The event object passed to event callbacks. It is used to provide information about the event as well as a tool to\n * manipulate it.\n */\nexport default class EventInfo {\n\t/**\n\t * @param {Object} source The emitter.\n\t * @param {String} name The event name.\n\t */\n\tconstructor( source, name ) {\n\t\t/**\n\t\t * The object that fired the event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object}\n\t\t */\n\t\tthis.source = source;\n\n\t\t/**\n\t\t * The event name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Path this event has followed. See {@link module:utils/emittermixin~EmitterMixin#delegate}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<Object>}\n\t\t */\n\t\tthis.path = [];\n\n\t\t// The following methods are defined in the constructor because they must be re-created per instance.\n\n\t\t/**\n\t\t * Stops the event emitter to call further callbacks for this event interaction.\n\t\t *\n\t\t * @method #stop\n\t\t */\n\t\tthis.stop = spy();\n\n\t\t/**\n\t\t * Removes the current callback from future interactions of this event.\n\t\t *\n\t\t * @method #off\n\t\t */\n\t\tthis.off = spy();\n\n\t\t/**\n\t\t * The value which will be returned by {@link module:utils/emittermixin~EmitterMixin#fire}.\n\t\t *\n\t\t * It's `undefined` by default and can be changed by an event listener:\n\t\t *\n\t\t *\t\tdataController.fire( 'getSelectedContent', ( evt ) => {\n\t\t *\t\t\t// This listener will make `dataController.fire( 'getSelectedContent' )`\n\t\t *\t\t\t// always return an empty DocumentFragment.\n\t\t *\t\t\tevt.return = new DocumentFragment();\n\t\t *\n\t\t *\t\t\t// Make sure no other listeners are executed.\n\t\t *\t\t\tevt.stop();\n\t\t *\t\t} );\n\t\t *\n\t\t * @member #return\n\t\t */\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/uid\n */\n\n/**\n * Returns a unique id. This id consist of an 'e' character and a randomly generated string of 32 aphanumeric characters.\n * Each character in uid string represents a hexadecimal digit (base 16).\n *\n * @returns {String} A hexadecimal number representing the id.\n */\nexport default function uid() {\n\tlet uuid = 'e'; // Make sure that id does not start with number.\n\n\tfor ( let i = 0; i < 8; i++ ) {\n\t\tuuid += Math.floor( ( 1 + Math.random() ) * 0x10000 ).toString( 16 ).substring( 1 );\n\t}\n\n\treturn uuid;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/priorities\n */\n\n/**\n * String representing a priority value.\n *\n * @typedef {'highest'|'high'|'normal'|'low'|'lowest'} module:utils/priorities~PriorityString\n */\n\n/**\n * Provides group of constants to use instead of hardcoding numeric priority values.\n *\n * @namespace\n */\nconst priorities = {\n\t/**\n\t * Converts a string with priority name to it's numeric value. If `Number` is given, it just returns it.\n\t *\n\t * @static\n\t * @param {module:utils/priorities~PriorityString|Number} priority Priority to convert.\n\t * @returns {Number} Converted priority.\n\t */\n\tget( priority ) {\n\t\tif ( typeof priority != 'number' ) {\n\t\t\treturn this[ priority ] || this.normal;\n\t\t} else {\n\t\t\treturn priority;\n\t\t}\n\t},\n\n\thighest: 100000,\n\thigh: 1000,\n\tnormal: 0,\n\tlow: -1000,\n\tlowest: -100000\n};\n\nexport default priorities;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/emittermixin\n */\n\nimport EventInfo from './eventinfo';\nimport uid from './uid';\nimport priorities from './priorities';\n\nconst _listeningTo = Symbol( 'listeningTo' );\nconst _emitterId = Symbol( 'emitterId' );\n\n/**\n * Mixin that injects the {@link ~Emitter events API} into its host.\n *\n * @mixin EmitterMixin\n * @implements module:utils/emittermixin~Emitter\n */\nconst EmitterMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\ton( event, callback, options = {} ) {\n\t\tthis.listenTo( this, event, callback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tonce( event, callback, options ) {\n\t\tconst onceCallback = function( event, ...args ) {\n\t\t\t// Go off() at the first call.\n\t\t\tevent.off();\n\n\t\t\t// Go with the original callback.\n\t\t\tcallback.call( this, event, ...args );\n\t\t};\n\n\t\t// Make a similar on() call, simply replacing the callback.\n\t\tthis.listenTo( this, event, onceCallback, options );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\toff( event, callback ) {\n\t\tthis.stopListening( this, event, callback );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tlistenTo( emitter, event, callback, options = {} ) {\n\t\tlet emitterInfo, eventCallbacks;\n\n\t\t// _listeningTo contains a list of emitters that this object is listening to.\n\t\t// This list has the following format:\n\t\t//\n\t\t// _listeningTo: {\n\t\t//     emitterId: {\n\t\t//         emitter: emitter,\n\t\t//         callbacks: {\n\t\t//             event1: [ callback1, callback2, ... ]\n\t\t//             ....\n\t\t//         }\n\t\t//     },\n\t\t//     ...\n\t\t// }\n\n\t\tif ( !this[ _listeningTo ] ) {\n\t\t\tthis[ _listeningTo ] = {};\n\t\t}\n\n\t\tconst emitters = this[ _listeningTo ];\n\n\t\tif ( !_getEmitterId( emitter ) ) {\n\t\t\t_setEmitterId( emitter );\n\t\t}\n\n\t\tconst emitterId = _getEmitterId( emitter );\n\n\t\tif ( !( emitterInfo = emitters[ emitterId ] ) ) {\n\t\t\temitterInfo = emitters[ emitterId ] = {\n\t\t\t\temitter,\n\t\t\t\tcallbacks: {}\n\t\t\t};\n\t\t}\n\n\t\tif ( !( eventCallbacks = emitterInfo.callbacks[ event ] ) ) {\n\t\t\teventCallbacks = emitterInfo.callbacks[ event ] = [];\n\t\t}\n\n\t\teventCallbacks.push( callback );\n\n\t\t// Finally register the callback to the event.\n\t\tcreateEventNamespace( emitter, event );\n\t\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\t\tconst priority = priorities.get( options.priority );\n\n\t\tconst callbackDefinition = {\n\t\t\tcallback,\n\t\t\tpriority\n\t\t};\n\n\t\t// Add the callback to all callbacks list.\n\t\tfor ( const callbacks of lists ) {\n\t\t\t// Add the callback to the list in the right priority position.\n\t\t\tlet added = false;\n\n\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\tif ( callbacks[ i ].priority < priority ) {\n\t\t\t\t\tcallbacks.splice( i, 0, callbackDefinition );\n\t\t\t\t\tadded = true;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add at the end, if right place was not found.\n\t\t\tif ( !added ) {\n\t\t\t\tcallbacks.push( callbackDefinition );\n\t\t\t}\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\tconst emitters = this[ _listeningTo ];\n\t\tlet emitterId = emitter && _getEmitterId( emitter );\n\t\tconst emitterInfo = emitters && emitterId && emitters[ emitterId ];\n\t\tconst eventCallbacks = emitterInfo && event && emitterInfo.callbacks[ event ];\n\n\t\t// Stop if nothing has been listened.\n\t\tif ( !emitters || ( emitter && !emitterInfo ) || ( event && !eventCallbacks ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// All params provided. off() that single callback.\n\t\tif ( callback ) {\n\t\t\tremoveCallback( emitter, event, callback );\n\t\t}\n\t\t// Only `emitter` and `event` provided. off() all callbacks for that event.\n\t\telse if ( eventCallbacks ) {\n\t\t\twhile ( ( callback = eventCallbacks.pop() ) ) {\n\t\t\t\tremoveCallback( emitter, event, callback );\n\t\t\t}\n\n\t\t\tdelete emitterInfo.callbacks[ event ];\n\t\t}\n\t\t// Only `emitter` provided. off() all events for that emitter.\n\t\telse if ( emitterInfo ) {\n\t\t\tfor ( event in emitterInfo.callbacks ) {\n\t\t\t\tthis.stopListening( emitter, event );\n\t\t\t}\n\t\t\tdelete emitters[ emitterId ];\n\t\t}\n\t\t// No params provided. off() all emitters.\n\t\telse {\n\t\t\tfor ( emitterId in emitters ) {\n\t\t\t\tthis.stopListening( emitters[ emitterId ].emitter );\n\t\t\t}\n\t\t\tdelete this[ _listeningTo ];\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tfire( eventOrInfo, ...args ) {\n\t\tconst eventInfo = eventOrInfo instanceof EventInfo ? eventOrInfo : new EventInfo( this, eventOrInfo );\n\t\tconst event = eventInfo.name;\n\t\tlet callbacks = getCallbacksForEvent( this, event );\n\n\t\t// Record that the event passed this emitter on its path.\n\t\teventInfo.path.push( this );\n\n\t\t// Handle event listener callbacks first.\n\t\tif ( callbacks ) {\n\t\t\t// Arguments passed to each callback.\n\t\t\tconst callbackArgs = [ eventInfo, ...args ];\n\n\t\t\t// Copying callbacks array is the easiest and most secure way of preventing infinite loops, when event callbacks\n\t\t\t// are added while processing other callbacks. Previous solution involved adding counters (unique ids) but\n\t\t\t// failed if callbacks were added to the queue before currently processed callback.\n\t\t\t// If this proves to be too inefficient, another method is to change `.on()` so callbacks are stored if same\n\t\t\t// event is currently processed. Then, `.fire()` at the end, would have to add all stored events.\n\t\t\tcallbacks = Array.from( callbacks );\n\n\t\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\t\tcallbacks[ i ].callback.apply( this, callbackArgs );\n\n\t\t\t\t// Remove the callback from future requests if off() has been called.\n\t\t\t\tif ( eventInfo.off.called ) {\n\t\t\t\t\t// Remove the called mark for the next calls.\n\t\t\t\t\tdelete eventInfo.off.called;\n\n\t\t\t\t\tremoveCallback( this, event, callbacks[ i ].callback );\n\t\t\t\t}\n\n\t\t\t\t// Do not execute next callbacks if stop() was called.\n\t\t\t\tif ( eventInfo.stop.called ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Delegate event to other emitters if needed.\n\t\tif ( this._delegations ) {\n\t\t\tconst destinations = this._delegations.get( event );\n\t\t\tconst passAllDestinations = this._delegations.get( '*' );\n\n\t\t\tif ( destinations ) {\n\t\t\t\tfireDelegatedEvents( destinations, eventInfo, args );\n\t\t\t}\n\n\t\t\tif ( passAllDestinations ) {\n\t\t\t\tfireDelegatedEvents( passAllDestinations, eventInfo, args );\n\t\t\t}\n\t\t}\n\n\t\treturn eventInfo.return;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdelegate( ...events ) {\n\t\treturn {\n\t\t\tto: ( emitter, nameOrFunction ) => {\n\t\t\t\tif ( !this._delegations ) {\n\t\t\t\t\tthis._delegations = new Map();\n\t\t\t\t}\n\n\t\t\t\tfor ( const eventName of events ) {\n\t\t\t\t\tconst destinations = this._delegations.get( eventName );\n\n\t\t\t\t\tif ( !destinations ) {\n\t\t\t\t\t\tthis._delegations.set( eventName, new Map( [ [ emitter, nameOrFunction ] ] ) );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tdestinations.set( emitter, nameOrFunction );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstopDelegating( event, emitter ) {\n\t\tif ( !this._delegations ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !event ) {\n\t\t\tthis._delegations.clear();\n\t\t} else if ( !emitter ) {\n\t\t\tthis._delegations.delete( event );\n\t\t} else {\n\t\t\tconst destinations = this._delegations.get( event );\n\n\t\t\tif ( destinations ) {\n\t\t\t\tdestinations.delete( emitter );\n\t\t\t}\n\t\t}\n\t}\n};\n\nexport default EmitterMixin;\n\n/**\n * Emitter/listener interface.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/emittermixin~EmitterMixin} mixin.\n *\n * @interface Emitter\n */\n\n/**\n * Registers a callback function to be executed when an event is fired.\n *\n * Shorthand for {@link #listenTo `this.listenTo( this, event, callback, options )`} (it makes the emitter\n * listen on itself).\n *\n * @method #on\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Registers a callback function to be executed on the next time the event is fired only. This is similar to\n * calling {@link #on} followed by {@link #off} in the callback.\n *\n * @method #once\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops executing the callback on the given event.\n * Shorthand for {@link #stopListening `this.stopListening( this, event, callback )`}.\n *\n * @method #off\n * @param {String} event The name of the event.\n * @param {Function} callback The function to stop being called.\n */\n\n/**\n * Registers a callback function to be executed when an event is fired in a specific (emitter) object.\n *\n * Events can be grouped in namespaces using `:`.\n * When namespaced event is fired, it additionally fires all callbacks for that namespace.\n *\n *\t\t// myEmitter.on( ... ) is a shorthand for myEmitter.listenTo( myEmitter, ... ).\n *\t\tmyEmitter.on( 'myGroup', genericCallback );\n *\t\tmyEmitter.on( 'myGroup:myEvent', specificCallback );\n *\n *\t\t// genericCallback is fired.\n *\t\tmyEmitter.fire( 'myGroup' );\n *\t\t// both genericCallback and specificCallback are fired.\n *\t\tmyEmitter.fire( 'myGroup:myEvent' );\n *\t\t// genericCallback is fired even though there are no callbacks for \"foo\".\n *\t\tmyEmitter.fire( 'myGroup:foo' );\n *\n * An event callback can {@link module:utils/eventinfo~EventInfo#stop stop the event} and\n * set the {@link module:utils/eventinfo~EventInfo#return return value} of the {@link #fire} method.\n *\n * @method #listenTo\n * @param {module:utils/emittermixin~Emitter} emitter The object that fires the event.\n * @param {String} event The name of the event.\n * @param {Function} callback The function to be called on event.\n * @param {Object} [options={}] Additional options.\n * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n * order they were added.\n */\n\n/**\n * Stops listening for events. It can be used at different levels:\n *\n * * To stop listening to a specific callback.\n * * To stop listening to a specific event.\n * * To stop listening to all events fired by a specific object.\n * * To stop listening to all events fired by all objects.\n *\n * @method #stopListening\n * @param {module:utils/emittermixin~Emitter} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n * for all events from `emitter`.\n * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n * `event`.\n */\n\n/**\n * Fires an event, executing all callbacks registered for it.\n *\n * The first parameter passed to callbacks is an {@link module:utils/eventinfo~EventInfo} object,\n * followed by the optional `args` provided in the `fire()` method call.\n *\n * @method #fire\n * @param {String|module:utils/eventinfo~EventInfo} eventOrInfo The name of the event or `EventInfo` object if event is delegated.\n * @param {...*} [args] Additional arguments to be passed to the callbacks.\n * @returns {*} By default the method returns `undefined`. However, the return value can be changed by listeners\n * through modification of the {@link module:utils/eventinfo~EventInfo#return `evt.return`}'s property (the event info\n * is the first param of every callback).\n */\n\n/**\n * Delegates selected events to another {@link module:utils/emittermixin~Emitter}. For instance:\n *\n *\t\temitterA.delegate( 'eventX' ).to( emitterB );\n *\t\temitterA.delegate( 'eventX', 'eventY' ).to( emitterC );\n *\n * then `eventX` is delegated (fired by) `emitterB` and `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventX', data );\n *\n * and `eventY` is delegated (fired by) `emitterC` along with `data`:\n *\n *\t\temitterA.fire( 'eventY', data );\n *\n * @method #delegate\n * @param {...String} events Event names that will be delegated to another emitter.\n * @returns {module:utils/emittermixin~EmitterMixinDelegateChain}\n */\n\n/**\n * Stops delegating events. It can be used at different levels:\n *\n * * To stop delegating all events.\n * * To stop delegating a specific event to all emitters.\n * * To stop delegating a specific event to a specific emitter.\n *\n * @method #stopDelegating\n * @param {String} [event] The name of the event to stop delegating. If omitted, stops it all delegations.\n * @param {module:utils/emittermixin~Emitter} [emitter] (requires `event`) The object to stop delegating a particular event to.\n * If omitted, stops delegation of `event` to all emitters.\n */\n\n/**\n * Checks if `listeningEmitter` listens to an emitter with given `listenedToEmitterId` and if so, returns that emitter.\n * If not, returns `null`.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} listeningEmitter Emitter that listens.\n * @param {String} listenedToEmitterId Unique emitter id of emitter listened to.\n * @returns {module:utils/emittermixin~EmitterMixin|null}\n */\nexport function _getEmitterListenedTo( listeningEmitter, listenedToEmitterId ) {\n\tif ( listeningEmitter[ _listeningTo ] && listeningEmitter[ _listeningTo ][ listenedToEmitterId ] ) {\n\t\treturn listeningEmitter[ _listeningTo ][ listenedToEmitterId ].emitter;\n\t}\n\n\treturn null;\n}\n\n/**\n * Sets emitter's unique id.\n *\n * **Note:** `_emitterId` can be set only once.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} emitter Emitter for which id will be set.\n * @param {String} [id] Unique id to set. If not passed, random unique id will be set.\n */\nexport function _setEmitterId( emitter, id ) {\n\tif ( !emitter[ _emitterId ] ) {\n\t\temitter[ _emitterId ] = id || uid();\n\t}\n}\n\n/**\n * Returns emitter's unique id.\n *\n * @protected\n * @param {module:utils/emittermixin~EmitterMixin} emitter Emitter which id will be returned.\n */\nexport function _getEmitterId( emitter ) {\n\treturn emitter[ _emitterId ];\n}\n\n// Gets the internal `_events` property of the given object.\n// `_events` property store all lists with callbacks for registered event names.\n// If there were no events registered on the object, empty `_events` object is created.\nfunction getEvents( source ) {\n\tif ( !source._events ) {\n\t\tObject.defineProperty( source, '_events', {\n\t\t\tvalue: {}\n\t\t} );\n\t}\n\n\treturn source._events;\n}\n\n// Creates event node for generic-specific events relation architecture.\nfunction makeEventNode() {\n\treturn {\n\t\tcallbacks: [],\n\t\tchildEvents: []\n\t};\n}\n\n// Creates an architecture for generic-specific events relation.\n// If needed, creates all events for given eventName, i.e. if the first registered event\n// is foo:bar:abc, it will create foo:bar:abc, foo:bar and foo event and tie them together.\n// It also copies callbacks from more generic events to more specific events when\n// specific events are created.\nfunction createEventNamespace( source, eventName ) {\n\tconst events = getEvents( source );\n\n\t// First, check if the event we want to add to the structure already exists.\n\tif ( events[ eventName ] ) {\n\t\t// If it exists, we don't have to do anything.\n\t\treturn;\n\t}\n\n\t// In other case, we have to create the structure for the event.\n\t// Note, that we might need to create intermediate events too.\n\t// I.e. if foo:bar:abc is being registered and we only have foo in the structure,\n\t// we need to also register foo:bar.\n\n\t// Currently processed event name.\n\tlet name = eventName;\n\t// Name of the event that is a child event for currently processed event.\n\tlet childEventName = null;\n\n\t// Array containing all newly created specific events.\n\tconst newEventNodes = [];\n\n\t// While loop can't check for ':' index because we have to handle generic events too.\n\t// In each loop, we truncate event name, going from the most specific name to the generic one.\n\t// I.e. foo:bar:abc -> foo:bar -> foo.\n\twhile ( name !== '' ) {\n\t\tif ( events[ name ] ) {\n\t\t\t// If the currently processed event name is already registered, we can be sure\n\t\t\t// that it already has all the structure created, so we can break the loop here\n\t\t\t// as no more events need to be registered.\n\t\t\tbreak;\n\t\t}\n\n\t\t// If this event is not yet registered, create a new object for it.\n\t\tevents[ name ] = makeEventNode();\n\t\t// Add it to the array with newly created events.\n\t\tnewEventNodes.push( events[ name ] );\n\n\t\t// Add previously processed event name as a child of this event.\n\t\tif ( childEventName ) {\n\t\t\tevents[ name ].childEvents.push( childEventName );\n\t\t}\n\n\t\tchildEventName = name;\n\t\t// If `.lastIndexOf()` returns -1, `.substr()` will return '' which will break the loop.\n\t\tname = name.substr( 0, name.lastIndexOf( ':' ) );\n\t}\n\n\tif ( name !== '' ) {\n\t\t// If name is not empty, we found an already registered event that was a parent of the\n\t\t// event we wanted to register.\n\n\t\t// Copy that event's callbacks to newly registered events.\n\t\tfor ( const node of newEventNodes ) {\n\t\t\tnode.callbacks = events[ name ].callbacks.slice();\n\t\t}\n\n\t\t// Add last newly created event to the already registered event.\n\t\tevents[ name ].childEvents.push( childEventName );\n\t}\n}\n\n// Gets an array containing callbacks list for a given event and it's more specific events.\n// I.e. if given event is foo:bar and there is also foo:bar:abc event registered, this will\n// return callback list of foo:bar and foo:bar:abc (but not foo).\nfunction getCallbacksListsForNamespace( source, eventName ) {\n\tconst eventNode = getEvents( source )[ eventName ];\n\n\tif ( !eventNode ) {\n\t\treturn [];\n\t}\n\n\tlet callbacksLists = [ eventNode.callbacks ];\n\n\tfor ( let i = 0; i < eventNode.childEvents.length; i++ ) {\n\t\tconst childCallbacksLists = getCallbacksListsForNamespace( source, eventNode.childEvents[ i ] );\n\n\t\tcallbacksLists = callbacksLists.concat( childCallbacksLists );\n\t}\n\n\treturn callbacksLists;\n}\n\n// Get the list of callbacks for a given event, but only if there any callbacks have been registered.\n// If there are no callbacks registered for given event, it checks if this is a specific event and looks\n// for callbacks for it's more generic version.\nfunction getCallbacksForEvent( source, eventName ) {\n\tlet event;\n\n\tif ( !source._events || !( event = source._events[ eventName ] ) || !event.callbacks.length ) {\n\t\t// There are no callbacks registered for specified eventName.\n\t\t// But this could be a specific-type event that is in a namespace.\n\t\tif ( eventName.indexOf( ':' ) > -1 ) {\n\t\t\t// If the eventName is specific, try to find callback lists for more generic event.\n\t\t\treturn getCallbacksForEvent( source, eventName.substr( 0, eventName.lastIndexOf( ':' ) ) );\n\t\t} else {\n\t\t\t// If this is a top-level generic event, return null;\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn event.callbacks;\n}\n\n// Fires delegated events for given map of destinations.\n//\n// @private\n// * @param {Map.<utils.Emitter>} destinations A map containing `[ {@link utils.Emitter}, \"event name\" ]` pair destinations.\n// * @param {utils.EventInfo} eventInfo The original event info object.\n// * @param {Array.<*>} fireArgs Arguments the original event was fired with.\nfunction fireDelegatedEvents( destinations, eventInfo, fireArgs ) {\n\tfor ( let [ emitter, name ] of destinations ) {\n\t\tif ( !name ) {\n\t\t\tname = eventInfo.name;\n\t\t} else if ( typeof name == 'function' ) {\n\t\t\tname = name( eventInfo.name );\n\t\t}\n\n\t\tconst delegatedInfo = new EventInfo( eventInfo.source, name );\n\n\t\tdelegatedInfo.path = [ ...eventInfo.path ];\n\n\t\temitter.fire( delegatedInfo, ...fireArgs );\n\t}\n}\n\n// Removes callback from emitter for given event.\n//\n// @param {module:utils/emittermixin~Emitter} emitter\n// @param {String} event\n// @param {Function} callback\nfunction removeCallback( emitter, event, callback ) {\n\tconst lists = getCallbacksListsForNamespace( emitter, event );\n\n\tfor ( const callbacks of lists ) {\n\t\tfor ( let i = 0; i < callbacks.length; i++ ) {\n\t\t\tif ( callbacks[ i ].callback == callback ) {\n\t\t\t\t// Remove the callback from the list (fixing the next index).\n\t\t\t\tcallbacks.splice( i, 1 );\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * The return value of {@link ~EmitterMixin#delegate}.\n *\n * @interface module:utils/emittermixin~EmitterMixinDelegateChain\n */\n\n/**\n * Selects destination for {@link module:utils/emittermixin~EmitterMixin#delegate} events.\n *\n * @method #to\n * @param {module:utils/emittermixin~Emitter} emitter An `EmitterMixin` instance which is the destination for delegated events.\n * @param {String|Function} nameOrFunction A custom event name or function which converts the original name string.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/mix\n */\n\n/**\n * Copies enumerable properties and symbols from the objects given as 2nd+ parameters to the\n * prototype of first object (a constructor).\n *\n *\t\tclass Editor {\n *\t\t\t...\n *\t\t}\n *\n *\t\tconst SomeMixin = {\n *\t\t\ta() {\n *\t\t\t\treturn 'a';\n *\t\t\t}\n *\t\t};\n *\n *\t\tmix( Editor, SomeMixin, ... );\n *\n *\t\tnew Editor().a(); // -> 'a'\n *\n * Note: Properties which already exist in the base class will not be overriden.\n *\n * @param {Function} [baseClass] Class which prototype will be extended.\n * @param {Object} [...mixins] Objects from which to get properties.\n */\nexport default function mix( baseClass, ...mixins ) {\n\tmixins.forEach( mixin => {\n\t\tObject.getOwnPropertyNames( mixin ).concat( Object.getOwnPropertySymbols( mixin ) )\n\t\t\t.forEach( key => {\n\t\t\t\tif ( key in baseClass.prototype ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst sourceDescriptor = Object.getOwnPropertyDescriptor( mixin, key );\n\t\t\t\tsourceDescriptor.enumerable = false;\n\n\t\t\t\tObject.defineProperty( baseClass.prototype, key, sourceDescriptor );\n\t\t\t} );\n\t} );\n}\n","/**\n * Removes all key-value entries from the list cache.\n *\n * @private\n * @name clear\n * @memberOf ListCache\n */\nfunction listCacheClear() {\n  this.__data__ = [];\n}\n\nexport default listCacheClear;\n","/**\n * Performs a\n * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * comparison between two values to determine if they are equivalent.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n * @example\n *\n * var object = { 'user': 'fred' };\n * var other = { 'user': 'fred' };\n *\n * _.eq(object, object);\n * // => true\n *\n * _.eq(object, other);\n * // => false\n *\n * _.eq('a', 'a');\n * // => true\n *\n * _.eq('a', Object('a'));\n * // => false\n *\n * _.eq(NaN, NaN);\n * // => true\n */\nfunction eq(value, other) {\n  return value === other || (value !== value && other !== other);\n}\n\nexport default eq;\n","import eq from './eq';\n\n/**\n * Gets the index at which the `key` is found in `array` of key-value pairs.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {*} key The key to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction assocIndexOf(array, key) {\n  var length = array.length;\n  while (length--) {\n    if (eq(array[length][0], key)) {\n      return length;\n    }\n  }\n  return -1;\n}\n\nexport default assocIndexOf;\n","import assocIndexOf from './_assocIndexOf';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * Removes `key` and its value from the list cache.\n *\n * @private\n * @name delete\n * @memberOf ListCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction listCacheDelete(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    return false;\n  }\n  var lastIndex = data.length - 1;\n  if (index == lastIndex) {\n    data.pop();\n  } else {\n    splice.call(data, index, 1);\n  }\n  return true;\n}\n\nexport default listCacheDelete;\n","import assocIndexOf from './_assocIndexOf';\n\n/**\n * Gets the list cache value for `key`.\n *\n * @private\n * @name get\n * @memberOf ListCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction listCacheGet(key) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  return index < 0 ? undefined : data[index][1];\n}\n\nexport default listCacheGet;\n","import assocIndexOf from './_assocIndexOf';\n\n/**\n * Checks if a list cache value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf ListCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction listCacheHas(key) {\n  return assocIndexOf(this.__data__, key) > -1;\n}\n\nexport default listCacheHas;\n","import assocIndexOf from './_assocIndexOf';\n\n/**\n * Sets the list cache `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf ListCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the list cache instance.\n */\nfunction listCacheSet(key, value) {\n  var data = this.__data__,\n      index = assocIndexOf(data, key);\n\n  if (index < 0) {\n    data.push([key, value]);\n  } else {\n    data[index][1] = value;\n  }\n  return this;\n}\n\nexport default listCacheSet;\n","import listCacheClear from './_listCacheClear';\nimport listCacheDelete from './_listCacheDelete';\nimport listCacheGet from './_listCacheGet';\nimport listCacheHas from './_listCacheHas';\nimport listCacheSet from './_listCacheSet';\n\n/**\n * Creates an list cache object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction ListCache(entries) {\n  var index = -1,\n      length = entries ? entries.length : 0;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `ListCache`.\nListCache.prototype.clear = listCacheClear;\nListCache.prototype['delete'] = listCacheDelete;\nListCache.prototype.get = listCacheGet;\nListCache.prototype.has = listCacheHas;\nListCache.prototype.set = listCacheSet;\n\nexport default ListCache;\n","import ListCache from './_ListCache';\n\n/**\n * Removes all key-value entries from the stack.\n *\n * @private\n * @name clear\n * @memberOf Stack\n */\nfunction stackClear() {\n  this.__data__ = new ListCache;\n}\n\nexport default stackClear;\n","/**\n * Removes `key` and its value from the stack.\n *\n * @private\n * @name delete\n * @memberOf Stack\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction stackDelete(key) {\n  return this.__data__['delete'](key);\n}\n\nexport default stackDelete;\n","/**\n * Gets the stack value for `key`.\n *\n * @private\n * @name get\n * @memberOf Stack\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction stackGet(key) {\n  return this.__data__.get(key);\n}\n\nexport default stackGet;\n","/**\n * Checks if a stack value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Stack\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction stackHas(key) {\n  return this.__data__.has(key);\n}\n\nexport default stackHas;\n","/**\n * Checks if `value` is the\n * [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)\n * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an object, else `false`.\n * @example\n *\n * _.isObject({});\n * // => true\n *\n * _.isObject([1, 2, 3]);\n * // => true\n *\n * _.isObject(_.noop);\n * // => true\n *\n * _.isObject(null);\n * // => false\n */\nfunction isObject(value) {\n  var type = typeof value;\n  return !!value && (type == 'object' || type == 'function');\n}\n\nexport default isObject;\n","import isObject from './isObject';\n\n/** `Object#toString` result references. */\nvar funcTag = '[object Function]',\n    genTag = '[object GeneratorFunction]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/**\n * Checks if `value` is classified as a `Function` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isFunction(_);\n * // => true\n *\n * _.isFunction(/abc/);\n * // => false\n */\nfunction isFunction(value) {\n  // The use of `Object#toString` avoids issues with the `typeof` operator\n  // in Safari 8 which returns 'object' for typed array and weak map constructors,\n  // and PhantomJS 1.9 which returns 'function' for `NodeList` instances.\n  var tag = isObject(value) ? objectToString.call(value) : '';\n  return tag == funcTag || tag == genTag;\n}\n\nexport default isFunction;\n","/** Used to resolve the decompiled source of functions. */\nvar funcToString = Function.prototype.toString;\n\n/**\n * Converts `func` to its source code.\n *\n * @private\n * @param {Function} func The function to process.\n * @returns {string} Returns the source code.\n */\nfunction toSource(func) {\n  if (func != null) {\n    try {\n      return funcToString.call(func);\n    } catch (e) {}\n    try {\n      return (func + '');\n    } catch (e) {}\n  }\n  return '';\n}\n\nexport default toSource;\n","import isFunction from './isFunction';\nimport isHostObject from './_isHostObject';\nimport isObject from './isObject';\nimport toSource from './_toSource';\n\n/**\n * Used to match `RegExp`\n * [syntax characters](http://ecma-international.org/ecma-262/6.0/#sec-patterns).\n */\nvar reRegExpChar = /[\\\\^$.*+?()[\\]{}|]/g;\n\n/** Used to detect host constructors (Safari). */\nvar reIsHostCtor = /^\\[object .+?Constructor\\]$/;\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to resolve the decompiled source of functions. */\nvar funcToString = Function.prototype.toString;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/** Used to detect if a method is native. */\nvar reIsNative = RegExp('^' +\n  funcToString.call(hasOwnProperty).replace(reRegExpChar, '\\\\$&')\n  .replace(/hasOwnProperty|(function).*?(?=\\\\\\()| for .+?(?=\\\\\\])/g, '$1.*?') + '$'\n);\n\n/**\n * Checks if `value` is a native function.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a native function,\n *  else `false`.\n * @example\n *\n * _.isNative(Array.prototype.push);\n * // => true\n *\n * _.isNative(_);\n * // => false\n */\nfunction isNative(value) {\n  if (!isObject(value)) {\n    return false;\n  }\n  var pattern = (isFunction(value) || isHostObject(value)) ? reIsNative : reIsHostCtor;\n  return pattern.test(toSource(value));\n}\n\nexport default isNative;\n","import isNative from './isNative';\n\n/**\n * Gets the native function at `key` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {string} key The key of the method to get.\n * @returns {*} Returns the function if it's native, else `undefined`.\n */\nfunction getNative(object, key) {\n  var value = object[key];\n  return isNative(value) ? value : undefined;\n}\n\nexport default getNative;\n","import getNative from './_getNative';\n\n/* Built-in method references that are verified to be native. */\nvar nativeCreate = getNative(Object, 'create');\n\nexport default nativeCreate;\n","import nativeCreate from './_nativeCreate';\n\n/**\n * Removes all key-value entries from the hash.\n *\n * @private\n * @name clear\n * @memberOf Hash\n */\nfunction hashClear() {\n  this.__data__ = nativeCreate ? nativeCreate(null) : {};\n}\n\nexport default hashClear;\n","/**\n * Removes `key` and its value from the hash.\n *\n * @private\n * @name delete\n * @memberOf Hash\n * @param {Object} hash The hash to modify.\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction hashDelete(key) {\n  return this.has(key) && delete this.__data__[key];\n}\n\nexport default hashDelete;\n","import nativeCreate from './_nativeCreate';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Gets the hash value for `key`.\n *\n * @private\n * @name get\n * @memberOf Hash\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction hashGet(key) {\n  var data = this.__data__;\n  if (nativeCreate) {\n    var result = data[key];\n    return result === HASH_UNDEFINED ? undefined : result;\n  }\n  return hasOwnProperty.call(data, key) ? data[key] : undefined;\n}\n\nexport default hashGet;\n","import nativeCreate from './_nativeCreate';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Checks if a hash value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf Hash\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction hashHas(key) {\n  var data = this.__data__;\n  return nativeCreate ? data[key] !== undefined : hasOwnProperty.call(data, key);\n}\n\nexport default hashHas;\n","import nativeCreate from './_nativeCreate';\n\n/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Sets the hash `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Hash\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the hash instance.\n */\nfunction hashSet(key, value) {\n  var data = this.__data__;\n  data[key] = (nativeCreate && value === undefined) ? HASH_UNDEFINED : value;\n  return this;\n}\n\nexport default hashSet;\n","import hashClear from './_hashClear';\nimport hashDelete from './_hashDelete';\nimport hashGet from './_hashGet';\nimport hashHas from './_hashHas';\nimport hashSet from './_hashSet';\n\n/**\n * Creates a hash object.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Hash(entries) {\n  var index = -1,\n      length = entries ? entries.length : 0;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `Hash`.\nHash.prototype.clear = hashClear;\nHash.prototype['delete'] = hashDelete;\nHash.prototype.get = hashGet;\nHash.prototype.has = hashHas;\nHash.prototype.set = hashSet;\n\nexport default Hash;\n","import getNative from './_getNative';\nimport root from './_root';\n\n/* Built-in method references that are verified to be native. */\nvar Map = getNative(root, 'Map');\n\nexport default Map;\n","import Hash from './_Hash';\nimport ListCache from './_ListCache';\nimport Map from './_Map';\n\n/**\n * Removes all key-value entries from the map.\n *\n * @private\n * @name clear\n * @memberOf MapCache\n */\nfunction mapCacheClear() {\n  this.__data__ = {\n    'hash': new Hash,\n    'map': new (Map || ListCache),\n    'string': new Hash\n  };\n}\n\nexport default mapCacheClear;\n","/**\n * Checks if `value` is suitable for use as unique object key.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is suitable, else `false`.\n */\nfunction isKeyable(value) {\n  var type = typeof value;\n  return (type == 'string' || type == 'number' || type == 'symbol' || type == 'boolean')\n    ? (value !== '__proto__')\n    : (value === null);\n}\n\nexport default isKeyable;\n","import isKeyable from './_isKeyable';\n\n/**\n * Gets the data for `map`.\n *\n * @private\n * @param {Object} map The map to query.\n * @param {string} key The reference key.\n * @returns {*} Returns the map data.\n */\nfunction getMapData(map, key) {\n  var data = map.__data__;\n  return isKeyable(key)\n    ? data[typeof key == 'string' ? 'string' : 'hash']\n    : data.map;\n}\n\nexport default getMapData;\n","import getMapData from './_getMapData';\n\n/**\n * Removes `key` and its value from the map.\n *\n * @private\n * @name delete\n * @memberOf MapCache\n * @param {string} key The key of the value to remove.\n * @returns {boolean} Returns `true` if the entry was removed, else `false`.\n */\nfunction mapCacheDelete(key) {\n  return getMapData(this, key)['delete'](key);\n}\n\nexport default mapCacheDelete;\n","import getMapData from './_getMapData';\n\n/**\n * Gets the map value for `key`.\n *\n * @private\n * @name get\n * @memberOf MapCache\n * @param {string} key The key of the value to get.\n * @returns {*} Returns the entry value.\n */\nfunction mapCacheGet(key) {\n  return getMapData(this, key).get(key);\n}\n\nexport default mapCacheGet;\n","import getMapData from './_getMapData';\n\n/**\n * Checks if a map value for `key` exists.\n *\n * @private\n * @name has\n * @memberOf MapCache\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction mapCacheHas(key) {\n  return getMapData(this, key).has(key);\n}\n\nexport default mapCacheHas;\n","import getMapData from './_getMapData';\n\n/**\n * Sets the map `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf MapCache\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the map cache instance.\n */\nfunction mapCacheSet(key, value) {\n  getMapData(this, key).set(key, value);\n  return this;\n}\n\nexport default mapCacheSet;\n","import mapCacheClear from './_mapCacheClear';\nimport mapCacheDelete from './_mapCacheDelete';\nimport mapCacheGet from './_mapCacheGet';\nimport mapCacheHas from './_mapCacheHas';\nimport mapCacheSet from './_mapCacheSet';\n\n/**\n * Creates a map cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction MapCache(entries) {\n  var index = -1,\n      length = entries ? entries.length : 0;\n\n  this.clear();\n  while (++index < length) {\n    var entry = entries[index];\n    this.set(entry[0], entry[1]);\n  }\n}\n\n// Add methods to `MapCache`.\nMapCache.prototype.clear = mapCacheClear;\nMapCache.prototype['delete'] = mapCacheDelete;\nMapCache.prototype.get = mapCacheGet;\nMapCache.prototype.has = mapCacheHas;\nMapCache.prototype.set = mapCacheSet;\n\nexport default MapCache;\n","import ListCache from './_ListCache';\nimport MapCache from './_MapCache';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * Sets the stack `key` to `value`.\n *\n * @private\n * @name set\n * @memberOf Stack\n * @param {string} key The key of the value to set.\n * @param {*} value The value to set.\n * @returns {Object} Returns the stack cache instance.\n */\nfunction stackSet(key, value) {\n  var cache = this.__data__;\n  if (cache instanceof ListCache && cache.__data__.length == LARGE_ARRAY_SIZE) {\n    cache = this.__data__ = new MapCache(cache.__data__);\n  }\n  cache.set(key, value);\n  return this;\n}\n\nexport default stackSet;\n","import ListCache from './_ListCache';\nimport stackClear from './_stackClear';\nimport stackDelete from './_stackDelete';\nimport stackGet from './_stackGet';\nimport stackHas from './_stackHas';\nimport stackSet from './_stackSet';\n\n/**\n * Creates a stack cache object to store key-value pairs.\n *\n * @private\n * @constructor\n * @param {Array} [entries] The key-value pairs to cache.\n */\nfunction Stack(entries) {\n  this.__data__ = new ListCache(entries);\n}\n\n// Add methods to `Stack`.\nStack.prototype.clear = stackClear;\nStack.prototype['delete'] = stackDelete;\nStack.prototype.get = stackGet;\nStack.prototype.has = stackHas;\nStack.prototype.set = stackSet;\n\nexport default Stack;\n","/**\n * A specialized version of `_.forEach` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns `array`.\n */\nfunction arrayEach(array, iteratee) {\n  var index = -1,\n      length = array.length;\n\n  while (++index < length) {\n    if (iteratee(array[index], index, array) === false) {\n      break;\n    }\n  }\n  return array;\n}\n\nexport default arrayEach;\n","import eq from './eq';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Assigns `value` to `key` of `object` if the existing value is not equivalent\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @private\n * @param {Object} object The object to modify.\n * @param {string} key The key of the property to assign.\n * @param {*} value The value to assign.\n */\nfunction assignValue(object, key, value) {\n  var objValue = object[key];\n  if (!(hasOwnProperty.call(object, key) && eq(objValue, value)) ||\n      (value === undefined && !(key in object))) {\n    object[key] = value;\n  }\n}\n\nexport default assignValue;\n","import assignValue from './_assignValue';\n\n/**\n * Copies properties of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy properties from.\n * @param {Array} props The property identifiers to copy.\n * @param {Object} [object={}] The object to copy properties to.\n * @param {Function} [customizer] The function to customize copied values.\n * @returns {Object} Returns `object`.\n */\nfunction copyObject(source, props, object, customizer) {\n  object || (object = {});\n\n  var index = -1,\n      length = props.length;\n\n  while (++index < length) {\n    var key = props[index];\n\n    var newValue = customizer\n      ? customizer(object[key], source[key], key, object, source)\n      : source[key];\n\n    assignValue(object, key, newValue);\n  }\n  return object;\n}\n\nexport default copyObject;\n","import getPrototype from './_getPrototype';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * The base implementation of `_.has` without support for deep paths.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} key The key to check.\n * @returns {boolean} Returns `true` if `key` exists, else `false`.\n */\nfunction baseHas(object, key) {\n  // Avoid a bug in IE 10-11 where objects with a [[Prototype]] of `null`,\n  // that are composed entirely of index properties, return `false` for\n  // `hasOwnProperty` checks of them.\n  return hasOwnProperty.call(object, key) ||\n    (typeof object == 'object' && key in object && getPrototype(object) === null);\n}\n\nexport default baseHas;\n","/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeKeys = Object.keys;\n\n/**\n * The base implementation of `_.keys` which doesn't skip the constructor\n * property of prototypes or treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeys(object) {\n  return nativeKeys(Object(object));\n}\n\nexport default baseKeys;\n","/**\n * The base implementation of `_.times` without support for iteratee shorthands\n * or max array length checks.\n *\n * @private\n * @param {number} n The number of times to invoke `iteratee`.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the array of results.\n */\nfunction baseTimes(n, iteratee) {\n  var index = -1,\n      result = Array(n);\n\n  while (++index < n) {\n    result[index] = iteratee(index);\n  }\n  return result;\n}\n\nexport default baseTimes;\n","/**\n * The base implementation of `_.property` without support for deep paths.\n *\n * @private\n * @param {string} key The key of the property to get.\n * @returns {Function} Returns the new accessor function.\n */\nfunction baseProperty(key) {\n  return function(object) {\n    return object == null ? undefined : object[key];\n  };\n}\n\nexport default baseProperty;\n","import baseProperty from './_baseProperty';\n\n/**\n * Gets the \"length\" property value of `object`.\n *\n * **Note:** This function is used to avoid a\n * [JIT bug](https://bugs.webkit.org/show_bug.cgi?id=142792) that affects\n * Safari on at least iOS 8.1-8.3 ARM64.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {*} Returns the \"length\" value.\n */\nvar getLength = baseProperty('length');\n\nexport default getLength;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/**\n * Checks if `value` is a valid array-like length.\n *\n * **Note:** This function is loosely based on\n * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a valid length,\n *  else `false`.\n * @example\n *\n * _.isLength(3);\n * // => true\n *\n * _.isLength(Number.MIN_VALUE);\n * // => false\n *\n * _.isLength(Infinity);\n * // => false\n *\n * _.isLength('3');\n * // => false\n */\nfunction isLength(value) {\n  return typeof value == 'number' &&\n    value > -1 && value % 1 == 0 && value <= MAX_SAFE_INTEGER;\n}\n\nexport default isLength;\n","import getLength from './_getLength';\nimport isFunction from './isFunction';\nimport isLength from './isLength';\n\n/**\n * Checks if `value` is array-like. A value is considered array-like if it's\n * not a function and has a `value.length` that's an integer greater than or\n * equal to `0` and less than or equal to `Number.MAX_SAFE_INTEGER`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is array-like, else `false`.\n * @example\n *\n * _.isArrayLike([1, 2, 3]);\n * // => true\n *\n * _.isArrayLike(document.body.children);\n * // => true\n *\n * _.isArrayLike('abc');\n * // => true\n *\n * _.isArrayLike(_.noop);\n * // => false\n */\nfunction isArrayLike(value) {\n  return value != null && isLength(getLength(value)) && !isFunction(value);\n}\n\nexport default isArrayLike;\n","import isArrayLike from './isArrayLike';\nimport isObjectLike from './isObjectLike';\n\n/**\n * This method is like `_.isArrayLike` except that it also checks if `value`\n * is an object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is an array-like object,\n *  else `false`.\n * @example\n *\n * _.isArrayLikeObject([1, 2, 3]);\n * // => true\n *\n * _.isArrayLikeObject(document.body.children);\n * // => true\n *\n * _.isArrayLikeObject('abc');\n * // => false\n *\n * _.isArrayLikeObject(_.noop);\n * // => false\n */\nfunction isArrayLikeObject(value) {\n  return isObjectLike(value) && isArrayLike(value);\n}\n\nexport default isArrayLikeObject;\n","import isArrayLikeObject from './isArrayLikeObject';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/**\n * Checks if `value` is likely an `arguments` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isArguments(function() { return arguments; }());\n * // => true\n *\n * _.isArguments([1, 2, 3]);\n * // => false\n */\nfunction isArguments(value) {\n  // Safari 8.1 incorrectly makes `arguments.callee` enumerable in strict mode.\n  return isArrayLikeObject(value) && hasOwnProperty.call(value, 'callee') &&\n    (!propertyIsEnumerable.call(value, 'callee') || objectToString.call(value) == argsTag);\n}\n\nexport default isArguments;\n","/**\n * Checks if `value` is classified as an `Array` object.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @type {Function}\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isArray([1, 2, 3]);\n * // => true\n *\n * _.isArray(document.body.children);\n * // => false\n *\n * _.isArray('abc');\n * // => false\n *\n * _.isArray(_.noop);\n * // => false\n */\nvar isArray = Array.isArray;\n\nexport default isArray;\n","import isArray from './isArray';\nimport isObjectLike from './isObjectLike';\n\n/** `Object#toString` result references. */\nvar stringTag = '[object String]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/**\n * Checks if `value` is classified as a `String` primitive or object.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isString('abc');\n * // => true\n *\n * _.isString(1);\n * // => false\n */\nfunction isString(value) {\n  return typeof value == 'string' ||\n    (!isArray(value) && isObjectLike(value) && objectToString.call(value) == stringTag);\n}\n\nexport default isString;\n","import baseTimes from './_baseTimes';\nimport isArguments from './isArguments';\nimport isArray from './isArray';\nimport isLength from './isLength';\nimport isString from './isString';\n\n/**\n * Creates an array of index keys for `object` values of arrays,\n * `arguments` objects, and strings, otherwise `null` is returned.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array|null} Returns index keys, else `null`.\n */\nfunction indexKeys(object) {\n  var length = object ? object.length : undefined;\n  if (isLength(length) &&\n      (isArray(object) || isString(object) || isArguments(object))) {\n    return baseTimes(length, String);\n  }\n  return null;\n}\n\nexport default indexKeys;\n","/** Used as references for various `Number` constants. */\nvar MAX_SAFE_INTEGER = 9007199254740991;\n\n/** Used to detect unsigned integer values. */\nvar reIsUint = /^(?:0|[1-9]\\d*)$/;\n\n/**\n * Checks if `value` is a valid array-like index.\n *\n * @private\n * @param {*} value The value to check.\n * @param {number} [length=MAX_SAFE_INTEGER] The upper bounds of a valid index.\n * @returns {boolean} Returns `true` if `value` is a valid index, else `false`.\n */\nfunction isIndex(value, length) {\n  length = length == null ? MAX_SAFE_INTEGER : length;\n  return !!length &&\n    (typeof value == 'number' || reIsUint.test(value)) &&\n    (value > -1 && value % 1 == 0 && value < length);\n}\n\nexport default isIndex;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Checks if `value` is likely a prototype object.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a prototype, else `false`.\n */\nfunction isPrototype(value) {\n  var Ctor = value && value.constructor,\n      proto = (typeof Ctor == 'function' && Ctor.prototype) || objectProto;\n\n  return value === proto;\n}\n\nexport default isPrototype;\n","import baseHas from './_baseHas';\nimport baseKeys from './_baseKeys';\nimport indexKeys from './_indexKeys';\nimport isArrayLike from './isArrayLike';\nimport isIndex from './_isIndex';\nimport isPrototype from './_isPrototype';\n\n/**\n * Creates an array of the own enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects. See the\n * [ES spec](http://ecma-international.org/ecma-262/6.0/#sec-object.keys)\n * for more details.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keys(new Foo);\n * // => ['a', 'b'] (iteration order is not guaranteed)\n *\n * _.keys('hi');\n * // => ['0', '1']\n */\nfunction keys(object) {\n  var isProto = isPrototype(object);\n  if (!(isProto || isArrayLike(object))) {\n    return baseKeys(object);\n  }\n  var indexes = indexKeys(object),\n      skipIndexes = !!indexes,\n      result = indexes || [],\n      length = result.length;\n\n  for (var key in object) {\n    if (baseHas(object, key) &&\n        !(skipIndexes && (key == 'length' || isIndex(key, length))) &&\n        !(isProto && key == 'constructor')) {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default keys;\n","import copyObject from './_copyObject';\nimport keys from './keys';\n\n/**\n * The base implementation of `_.assign` without support for multiple sources\n * or `customizer` functions.\n *\n * @private\n * @param {Object} object The destination object.\n * @param {Object} source The source object.\n * @returns {Object} Returns `object`.\n */\nfunction baseAssign(object, source) {\n  return object && copyObject(source, keys(source), object);\n}\n\nexport default baseAssign;\n","/**\n * Creates a clone of  `buffer`.\n *\n * @private\n * @param {Buffer} buffer The buffer to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Buffer} Returns the cloned buffer.\n */\nfunction cloneBuffer(buffer, isDeep) {\n  if (isDeep) {\n    return buffer.slice();\n  }\n  var result = new buffer.constructor(buffer.length);\n  buffer.copy(result);\n  return result;\n}\n\nexport default cloneBuffer;\n","/**\n * Copies the values of `source` to `array`.\n *\n * @private\n * @param {Array} source The array to copy values from.\n * @param {Array} [array=[]] The array to copy values to.\n * @returns {Array} Returns `array`.\n */\nfunction copyArray(source, array) {\n  var index = -1,\n      length = source.length;\n\n  array || (array = Array(length));\n  while (++index < length) {\n    array[index] = source[index];\n  }\n  return array;\n}\n\nexport default copyArray;\n","/** Built-in value references. */\nvar getOwnPropertySymbols = Object.getOwnPropertySymbols;\n\n/**\n * Creates an array of the own enumerable symbol properties of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of symbols.\n */\nfunction getSymbols(object) {\n  // Coerce `object` to an object to avoid non-object errors in V8.\n  // See https://bugs.chromium.org/p/v8/issues/detail?id=3443 for more details.\n  return getOwnPropertySymbols(Object(object));\n}\n\n// Fallback for IE < 11.\nif (!getOwnPropertySymbols) {\n  getSymbols = function() {\n    return [];\n  };\n}\n\nexport default getSymbols;\n","import copyObject from './_copyObject';\nimport getSymbols from './_getSymbols';\n\n/**\n * Copies own symbol properties of `source` to `object`.\n *\n * @private\n * @param {Object} source The object to copy symbols from.\n * @param {Object} [object={}] The object to copy symbols to.\n * @returns {Object} Returns `object`.\n */\nfunction copySymbols(source, object) {\n  return copyObject(source, getSymbols(source), object);\n}\n\nexport default copySymbols;\n","/**\n * Appends the elements of `values` to `array`.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to append.\n * @returns {Array} Returns `array`.\n */\nfunction arrayPush(array, values) {\n  var index = -1,\n      length = values.length,\n      offset = array.length;\n\n  while (++index < length) {\n    array[offset + index] = values[index];\n  }\n  return array;\n}\n\nexport default arrayPush;\n","import arrayPush from './_arrayPush';\nimport isArray from './isArray';\n\n/**\n * The base implementation of `getAllKeys` and `getAllKeysIn` which uses\n * `keysFunc` and `symbolsFunc` to get the enumerable property names and\n * symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Function} keysFunc The function to get the keys of `object`.\n * @param {Function} symbolsFunc The function to get the symbols of `object`.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction baseGetAllKeys(object, keysFunc, symbolsFunc) {\n  var result = keysFunc(object);\n  return isArray(object) ? result : arrayPush(result, symbolsFunc(object));\n}\n\nexport default baseGetAllKeys;\n","import baseGetAllKeys from './_baseGetAllKeys';\nimport getSymbols from './_getSymbols';\nimport keys from './keys';\n\n/**\n * Creates an array of own enumerable property names and symbols of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names and symbols.\n */\nfunction getAllKeys(object) {\n  return baseGetAllKeys(object, keys, getSymbols);\n}\n\nexport default getAllKeys;\n","import getNative from './_getNative';\nimport root from './_root';\n\n/* Built-in method references that are verified to be native. */\nvar DataView = getNative(root, 'DataView');\n\nexport default DataView;\n","import getNative from './_getNative';\nimport root from './_root';\n\n/* Built-in method references that are verified to be native. */\nvar Promise = getNative(root, 'Promise');\n\nexport default Promise;\n","import getNative from './_getNative';\nimport root from './_root';\n\n/* Built-in method references that are verified to be native. */\nvar Set = getNative(root, 'Set');\n\nexport default Set;\n","import getNative from './_getNative';\nimport root from './_root';\n\n/* Built-in method references that are verified to be native. */\nvar WeakMap = getNative(root, 'WeakMap');\n\nexport default WeakMap;\n","import DataView from './_DataView';\nimport Map from './_Map';\nimport Promise from './_Promise';\nimport Set from './_Set';\nimport WeakMap from './_WeakMap';\nimport toSource from './_toSource';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]',\n    objectTag = '[object Object]',\n    promiseTag = '[object Promise]',\n    setTag = '[object Set]',\n    weakMapTag = '[object WeakMap]';\n\nvar dataViewTag = '[object DataView]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/** Used to detect maps, sets, and weakmaps. */\nvar dataViewCtorString = toSource(DataView),\n    mapCtorString = toSource(Map),\n    promiseCtorString = toSource(Promise),\n    setCtorString = toSource(Set),\n    weakMapCtorString = toSource(WeakMap);\n\n/**\n * Gets the `toStringTag` of `value`.\n *\n * @private\n * @param {*} value The value to query.\n * @returns {string} Returns the `toStringTag`.\n */\nfunction getTag(value) {\n  return objectToString.call(value);\n}\n\n// Fallback for data views, maps, sets, and weak maps in IE 11,\n// for data views in Edge, and promises in Node.js.\nif ((DataView && getTag(new DataView(new ArrayBuffer(1))) != dataViewTag) ||\n    (Map && getTag(new Map) != mapTag) ||\n    (Promise && getTag(Promise.resolve()) != promiseTag) ||\n    (Set && getTag(new Set) != setTag) ||\n    (WeakMap && getTag(new WeakMap) != weakMapTag)) {\n  getTag = function(value) {\n    var result = objectToString.call(value),\n        Ctor = result == objectTag ? value.constructor : undefined,\n        ctorString = Ctor ? toSource(Ctor) : undefined;\n\n    if (ctorString) {\n      switch (ctorString) {\n        case dataViewCtorString: return dataViewTag;\n        case mapCtorString: return mapTag;\n        case promiseCtorString: return promiseTag;\n        case setCtorString: return setTag;\n        case weakMapCtorString: return weakMapTag;\n      }\n    }\n    return result;\n  };\n}\n\nexport default getTag;\n","/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Initializes an array clone.\n *\n * @private\n * @param {Array} array The array to clone.\n * @returns {Array} Returns the initialized clone.\n */\nfunction initCloneArray(array) {\n  var length = array.length,\n      result = array.constructor(length);\n\n  // Add properties assigned by `RegExp#exec`.\n  if (length && typeof array[0] == 'string' && hasOwnProperty.call(array, 'index')) {\n    result.index = array.index;\n    result.input = array.input;\n  }\n  return result;\n}\n\nexport default initCloneArray;\n","import root from './_root';\n\n/** Built-in value references. */\nvar Uint8Array = root.Uint8Array;\n\nexport default Uint8Array;\n","import Uint8Array from './_Uint8Array';\n\n/**\n * Creates a clone of `arrayBuffer`.\n *\n * @private\n * @param {ArrayBuffer} arrayBuffer The array buffer to clone.\n * @returns {ArrayBuffer} Returns the cloned array buffer.\n */\nfunction cloneArrayBuffer(arrayBuffer) {\n  var result = new arrayBuffer.constructor(arrayBuffer.byteLength);\n  new Uint8Array(result).set(new Uint8Array(arrayBuffer));\n  return result;\n}\n\nexport default cloneArrayBuffer;\n","import cloneArrayBuffer from './_cloneArrayBuffer';\n\n/**\n * Creates a clone of `dataView`.\n *\n * @private\n * @param {Object} dataView The data view to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned data view.\n */\nfunction cloneDataView(dataView, isDeep) {\n  var buffer = isDeep ? cloneArrayBuffer(dataView.buffer) : dataView.buffer;\n  return new dataView.constructor(buffer, dataView.byteOffset, dataView.byteLength);\n}\n\nexport default cloneDataView;\n","/**\n * Adds the key-value `pair` to `map`.\n *\n * @private\n * @param {Object} map The map to modify.\n * @param {Array} pair The key-value pair to add.\n * @returns {Object} Returns `map`.\n */\nfunction addMapEntry(map, pair) {\n  // Don't return `Map#set` because it doesn't return the map instance in IE 11.\n  map.set(pair[0], pair[1]);\n  return map;\n}\n\nexport default addMapEntry;\n","/**\n * A specialized version of `_.reduce` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @param {*} [accumulator] The initial value.\n * @param {boolean} [initAccum] Specify using the first element of `array` as\n *  the initial value.\n * @returns {*} Returns the accumulated value.\n */\nfunction arrayReduce(array, iteratee, accumulator, initAccum) {\n  var index = -1,\n      length = array.length;\n\n  if (initAccum && length) {\n    accumulator = array[++index];\n  }\n  while (++index < length) {\n    accumulator = iteratee(accumulator, array[index], index, array);\n  }\n  return accumulator;\n}\n\nexport default arrayReduce;\n","/**\n * Converts `map` to its key-value pairs.\n *\n * @private\n * @param {Object} map The map to convert.\n * @returns {Array} Returns the key-value pairs.\n */\nfunction mapToArray(map) {\n  var index = -1,\n      result = Array(map.size);\n\n  map.forEach(function(value, key) {\n    result[++index] = [key, value];\n  });\n  return result;\n}\n\nexport default mapToArray;\n","import addMapEntry from './_addMapEntry';\nimport arrayReduce from './_arrayReduce';\nimport mapToArray from './_mapToArray';\n\n/**\n * Creates a clone of `map`.\n *\n * @private\n * @param {Object} map The map to clone.\n * @param {Function} cloneFunc The function to clone values.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned map.\n */\nfunction cloneMap(map, isDeep, cloneFunc) {\n  var array = isDeep ? cloneFunc(mapToArray(map), true) : mapToArray(map);\n  return arrayReduce(array, addMapEntry, new map.constructor);\n}\n\nexport default cloneMap;\n","/** Used to match `RegExp` flags from their coerced string values. */\nvar reFlags = /\\w*$/;\n\n/**\n * Creates a clone of `regexp`.\n *\n * @private\n * @param {Object} regexp The regexp to clone.\n * @returns {Object} Returns the cloned regexp.\n */\nfunction cloneRegExp(regexp) {\n  var result = new regexp.constructor(regexp.source, reFlags.exec(regexp));\n  result.lastIndex = regexp.lastIndex;\n  return result;\n}\n\nexport default cloneRegExp;\n","/**\n * Adds `value` to `set`.\n *\n * @private\n * @param {Object} set The set to modify.\n * @param {*} value The value to add.\n * @returns {Object} Returns `set`.\n */\nfunction addSetEntry(set, value) {\n  set.add(value);\n  return set;\n}\n\nexport default addSetEntry;\n","/**\n * Converts `set` to an array of its values.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the values.\n */\nfunction setToArray(set) {\n  var index = -1,\n      result = Array(set.size);\n\n  set.forEach(function(value) {\n    result[++index] = value;\n  });\n  return result;\n}\n\nexport default setToArray;\n","import addSetEntry from './_addSetEntry';\nimport arrayReduce from './_arrayReduce';\nimport setToArray from './_setToArray';\n\n/**\n * Creates a clone of `set`.\n *\n * @private\n * @param {Object} set The set to clone.\n * @param {Function} cloneFunc The function to clone values.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned set.\n */\nfunction cloneSet(set, isDeep, cloneFunc) {\n  var array = isDeep ? cloneFunc(setToArray(set), true) : setToArray(set);\n  return arrayReduce(array, addSetEntry, new set.constructor);\n}\n\nexport default cloneSet;\n","import root from './_root';\n\n/** Built-in value references. */\nvar Symbol = root.Symbol;\n\nexport default Symbol;\n","import Symbol from './_Symbol';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * Creates a clone of the `symbol` object.\n *\n * @private\n * @param {Object} symbol The symbol object to clone.\n * @returns {Object} Returns the cloned symbol object.\n */\nfunction cloneSymbol(symbol) {\n  return symbolValueOf ? Object(symbolValueOf.call(symbol)) : {};\n}\n\nexport default cloneSymbol;\n","import cloneArrayBuffer from './_cloneArrayBuffer';\n\n/**\n * Creates a clone of `typedArray`.\n *\n * @private\n * @param {Object} typedArray The typed array to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the cloned typed array.\n */\nfunction cloneTypedArray(typedArray, isDeep) {\n  var buffer = isDeep ? cloneArrayBuffer(typedArray.buffer) : typedArray.buffer;\n  return new typedArray.constructor(buffer, typedArray.byteOffset, typedArray.length);\n}\n\nexport default cloneTypedArray;\n","import cloneArrayBuffer from './_cloneArrayBuffer';\nimport cloneDataView from './_cloneDataView';\nimport cloneMap from './_cloneMap';\nimport cloneRegExp from './_cloneRegExp';\nimport cloneSet from './_cloneSet';\nimport cloneSymbol from './_cloneSymbol';\nimport cloneTypedArray from './_cloneTypedArray';\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/**\n * Initializes an object clone based on its `toStringTag`.\n *\n * **Note:** This function only supports cloning values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to clone.\n * @param {string} tag The `toStringTag` of the object to clone.\n * @param {Function} cloneFunc The function to clone values.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneByTag(object, tag, cloneFunc, isDeep) {\n  var Ctor = object.constructor;\n  switch (tag) {\n    case arrayBufferTag:\n      return cloneArrayBuffer(object);\n\n    case boolTag:\n    case dateTag:\n      return new Ctor(+object);\n\n    case dataViewTag:\n      return cloneDataView(object, isDeep);\n\n    case float32Tag: case float64Tag:\n    case int8Tag: case int16Tag: case int32Tag:\n    case uint8Tag: case uint8ClampedTag: case uint16Tag: case uint32Tag:\n      return cloneTypedArray(object, isDeep);\n\n    case mapTag:\n      return cloneMap(object, isDeep, cloneFunc);\n\n    case numberTag:\n    case stringTag:\n      return new Ctor(object);\n\n    case regexpTag:\n      return cloneRegExp(object);\n\n    case setTag:\n      return cloneSet(object, isDeep, cloneFunc);\n\n    case symbolTag:\n      return cloneSymbol(object);\n  }\n}\n\nexport default initCloneByTag;\n","import isObject from './isObject';\n\n/** Built-in value references. */\nvar objectCreate = Object.create;\n\n/**\n * The base implementation of `_.create` without support for assigning\n * properties to the created object.\n *\n * @private\n * @param {Object} prototype The object to inherit from.\n * @returns {Object} Returns the new object.\n */\nfunction baseCreate(proto) {\n  return isObject(proto) ? objectCreate(proto) : {};\n}\n\nexport default baseCreate;\n","import baseCreate from './_baseCreate';\nimport getPrototype from './_getPrototype';\nimport isPrototype from './_isPrototype';\n\n/**\n * Initializes an object clone.\n *\n * @private\n * @param {Object} object The object to clone.\n * @returns {Object} Returns the initialized clone.\n */\nfunction initCloneObject(object) {\n  return (typeof object.constructor == 'function' && !isPrototype(object))\n    ? baseCreate(getPrototype(object))\n    : {};\n}\n\nexport default initCloneObject;\n","import Stack from './_Stack';\nimport arrayEach from './_arrayEach';\nimport assignValue from './_assignValue';\nimport baseAssign from './_baseAssign';\nimport cloneBuffer from './_cloneBuffer';\nimport copyArray from './_copyArray';\nimport copySymbols from './_copySymbols';\nimport getAllKeys from './_getAllKeys';\nimport getTag from './_getTag';\nimport initCloneArray from './_initCloneArray';\nimport initCloneByTag from './_initCloneByTag';\nimport initCloneObject from './_initCloneObject';\nimport isArray from './isArray';\nimport isBuffer from './isBuffer';\nimport isHostObject from './_isHostObject';\nimport isObject from './isObject';\nimport keys from './keys';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    funcTag = '[object Function]',\n    genTag = '[object GeneratorFunction]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    objectTag = '[object Object]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]',\n    weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values supported by `_.clone`. */\nvar cloneableTags = {};\ncloneableTags[argsTag] = cloneableTags[arrayTag] =\ncloneableTags[arrayBufferTag] = cloneableTags[dataViewTag] =\ncloneableTags[boolTag] = cloneableTags[dateTag] =\ncloneableTags[float32Tag] = cloneableTags[float64Tag] =\ncloneableTags[int8Tag] = cloneableTags[int16Tag] =\ncloneableTags[int32Tag] = cloneableTags[mapTag] =\ncloneableTags[numberTag] = cloneableTags[objectTag] =\ncloneableTags[regexpTag] = cloneableTags[setTag] =\ncloneableTags[stringTag] = cloneableTags[symbolTag] =\ncloneableTags[uint8Tag] = cloneableTags[uint8ClampedTag] =\ncloneableTags[uint16Tag] = cloneableTags[uint32Tag] = true;\ncloneableTags[errorTag] = cloneableTags[funcTag] =\ncloneableTags[weakMapTag] = false;\n\n/**\n * The base implementation of `_.clone` and `_.cloneDeep` which tracks\n * traversed objects.\n *\n * @private\n * @param {*} value The value to clone.\n * @param {boolean} [isDeep] Specify a deep clone.\n * @param {boolean} [isFull] Specify a clone including symbols.\n * @param {Function} [customizer] The function to customize cloning.\n * @param {string} [key] The key of `value`.\n * @param {Object} [object] The parent object of `value`.\n * @param {Object} [stack] Tracks traversed objects and their clone counterparts.\n * @returns {*} Returns the cloned value.\n */\nfunction baseClone(value, isDeep, isFull, customizer, key, object, stack) {\n  var result;\n  if (customizer) {\n    result = object ? customizer(value, key, object, stack) : customizer(value);\n  }\n  if (result !== undefined) {\n    return result;\n  }\n  if (!isObject(value)) {\n    return value;\n  }\n  var isArr = isArray(value);\n  if (isArr) {\n    result = initCloneArray(value);\n    if (!isDeep) {\n      return copyArray(value, result);\n    }\n  } else {\n    var tag = getTag(value),\n        isFunc = tag == funcTag || tag == genTag;\n\n    if (isBuffer(value)) {\n      return cloneBuffer(value, isDeep);\n    }\n    if (tag == objectTag || tag == argsTag || (isFunc && !object)) {\n      if (isHostObject(value)) {\n        return object ? value : {};\n      }\n      result = initCloneObject(isFunc ? {} : value);\n      if (!isDeep) {\n        return copySymbols(value, baseAssign(result, value));\n      }\n    } else {\n      if (!cloneableTags[tag]) {\n        return object ? value : {};\n      }\n      result = initCloneByTag(value, tag, baseClone, isDeep);\n    }\n  }\n  // Check for circular references and return its corresponding clone.\n  stack || (stack = new Stack);\n  var stacked = stack.get(value);\n  if (stacked) {\n    return stacked;\n  }\n  stack.set(value, result);\n\n  if (!isArr) {\n    var props = isFull ? getAllKeys(value) : keys(value);\n  }\n  // Recursively populate clone (susceptible to call stack limits).\n  arrayEach(props || value, function(subValue, key) {\n    if (props) {\n      key = subValue;\n      subValue = value[key];\n    }\n    assignValue(result, key, baseClone(subValue, isDeep, isFull, customizer, key, value, stack));\n  });\n  return result;\n}\n\nexport default baseClone;\n","import baseClone from './_baseClone';\n\n/**\n * Creates a shallow clone of `value`.\n *\n * **Note:** This method is loosely based on the\n * [structured clone algorithm](https://mdn.io/Structured_clone_algorithm)\n * and supports cloning arrays, array buffers, booleans, date objects, maps,\n * numbers, `Object` objects, regexes, sets, strings, symbols, and typed\n * arrays. The own enumerable properties of `arguments` objects are cloned\n * as plain objects. An empty object is returned for uncloneable values such\n * as error objects, functions, DOM nodes, and WeakMaps.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to clone.\n * @returns {*} Returns the cloned value.\n * @see _.cloneDeep\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var shallow = _.clone(objects);\n * console.log(shallow[0] === objects[0]);\n * // => true\n */\nfunction clone(value) {\n  return baseClone(value, false, true);\n}\n\nexport default clone;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/comparearrays\n */\n\n/**\n * Compares how given arrays relate to each other. One array can be: same as another array, prefix of another array\n * or completely different. If arrays are different, first index at which they differ is returned. Otherwise,\n * a flag specifying the relation is returned. Flags are negative numbers, so whenever a number >= 0 is returned\n * it means that arrays differ.\n *\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2 ] );\t\t// 'same'\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 2, 1 ] );\t\t// 'prefix'\n *\t\tcompareArrays( [ 0, 2 ], [ 0 ] );\t\t\t// 'extension'\n *\t\tcompareArrays( [ 0, 2 ], [ 1, 2 ] );\t\t// 0\n *\t\tcompareArrays( [ 0, 2 ], [ 0, 1 ] );\t\t// 1\n *\n * @param {Array} a Array that is compared.\n * @param {Array} b Array to compare with.\n * @returns {module:utils/comparearrays~ArrayRelation} How array `a` is related to `b`.\n */\nexport default function compareArrays( a, b ) {\n\tconst minLen = Math.min( a.length, b.length );\n\n\tfor ( let i = 0; i < minLen; i++ ) {\n\t\tif ( a[ i ] != b[ i ] ) {\n\t\t\t// The arrays are different.\n\t\t\treturn i;\n\t\t}\n\t}\n\n\t// Both arrays were same at all points.\n\tif ( a.length == b.length ) {\n\t\t// If their length is also same, they are the same.\n\t\treturn 'same';\n\t} else if ( a.length < b.length ) {\n\t\t// Compared array is shorter so it is a prefix of the other array.\n\t\treturn 'prefix';\n\t} else {\n\t\t// Compared array is longer so it is an extension of the other array.\n\t\treturn 'extension';\n\t}\n}\n\n/**\n * @typedef {'extension'|'same'|'prefix'} module:utils/comparearrays~ArrayRelation\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/node\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport clone from '@ckeditor/ckeditor5-utils/src/lib/lodash/clone';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n/**\n * Abstract tree view node class.\n *\n * @abstract\n */\nexport default class Node {\n\t/**\n\t * Creates a tree view node.\n\t *\n\t * This is an abstract class, so this constructor should not be used directly.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Parent element. Null by default. Set by {@link module:engine/view/element~Element#_insertChild}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\t}\n\n\t/**\n\t * Index of the node in the parent element or null if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that view tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// No parent or child doesn't exist in parent's children.\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) == -1 ) {\n\t\t\t/**\n\t\t\t * The node's parent does not contain this node. It means that the document tree is corrupted.\n\t\t\t *\n\t\t\t * @error view-node-not-found-in-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-node-not-found-in-parent: The node\\'s parent does not contain this node.' );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Node's next sibling, or `null` if it is the last child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling, or `null` if it is the first child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * Top-most ancestor of the node. If the node has no parent it is the root itself.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this node, or `null` if the node is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\t// Parent might be Node, null or DocumentFragment.\n\t\tif ( this.parent instanceof Node ) {\n\t\t\treturn this.parent.document;\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Gets a path to the node. The path is an array containing indices of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/view/node~Node#root root}, down to this node's index.\n\t *\n\t *\t\tconst abc = new Text( 'abc' );\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst h1 = new Element( 'h1', null, new Text( 'header' ) );\n\t *\t\tconst p = new Element( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = new Element( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.<Number>} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.index );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/element~Element} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/view/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Removes node from parent.\n\t *\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\n\t\tif ( this.parent ) {\n\t\t\tthis.parent._fireChange( type, node );\n\t\t}\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} Clone of this object with the parent property removed.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tdelete json.parent;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * This method is useful when processing view tree objects that are of unknown type. For example, a function\n\t * may return {@link module:engine/view/documentfragment~DocumentFragment} or {@link module:engine/view/node~Node}\n\t * that can be either text node or element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tobj.is( 'node' ); // true for any node, false for document fragment and text fragment\n\t *\t\tobj.is( 'documentFragment' ); // true for document fragment, false for any node\n\t *\t\tobj.is( 'element' ); // true for any element, false for text node or document fragment\n\t *\t\tobj.is( 'element', 'p' ); // true only for element which name is 'p'\n\t *\t\tobj.is( 'p' ); // shortcut for obj.is( 'element', 'p' )\n\t *\t\tobj.is( 'text' ); // true for text node, false for element and document fragment\n\t *\n\t * @method #is\n\t * @param {'element'|'containerElement'|'attributeElement'|'emptyElement'|'uiElement'|\n\t * 'rootElement'|'documentFragment'|'text'|'textProxy'} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'node';\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @method #_clone\n\t * @returns {module:engine/view/node~Node} Clone of this node.\n\t */\n\n\t/**\n\t * Checks if provided node is similar to this node.\n\t *\n\t * @method #isSimilar\n\t * @returns {Boolean} True if nodes are similar.\n\t */\n}\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} children changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:children\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} attributes changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:attributes\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when {@link module:engine/view/text~Text text nodes} data changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:text\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * @event change\n */\n\nmix( Node, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/text\n */\n\nimport Node from './node';\n\n/**\n * Tree view text node.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a tree view text node.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/view/writer~Writer#createText} method instead.\n\t *\n\t * @protected\n\t * @param {String} data Text.\n\t */\n\tconstructor( data ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * The text content.\n\t\t *\n\t\t * Setting the data fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t\t *\n\t\t * @protected\n\t\t * @member {String} module:engine/view/text~Text#_textData\n\t\t */\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type ) {\n\t\treturn type == 'text' || super.is( type );\n\t}\n\n\t/**\n\t * The text content.\n\t *\n\t * @returns {String}\n\t */\n\tget data() {\n\t\treturn this._textData;\n\t}\n\n\t/**\n\t * This getter is required when using the addition assignment operator on protected property:\n\t *\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst bar = new Text( 'bar' );\n\t *\n\t *\t\tfoo._data += bar.data;   // executes: `foo._data = foo._data + bar.data`\n\t *\t\tconsole.log( foo.data ); // prints: 'foobar'\n\t *\n\t * If the protected getter didn't exist, `foo._data` will return `undefined` and result of the merge will be invalid.\n\t *\n\t * @protected\n\t * @returns {String}\n\t */\n\tget _data() {\n\t\treturn this.data;\n\t}\n\n\t/**\n\t * Sets data and fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t *\n\t * @protected\n\t * @fires change:text\n\t * @param {String} data New data for the text node.\n\t */\n\tset _data( data ) {\n\t\tthis._fireChange( 'text', this );\n\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * Checks if this text node is similar to other text node.\n\t * Both nodes should have the same data to be considered as similar.\n\t *\n\t * @param {module:engine/view/text~Text} otherNode Node to check if it is same as this node.\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherNode ) {\n\t\tif ( !( otherNode instanceof Text ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this === otherNode || this.data === otherNode.data;\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @returns {module:engine/view/text~Text} Text node that is a clone of this node.\n\t */\n\t_clone() {\n\t\treturn new Text( this.data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * TextProxy is a wrapper for substring of {@link module:engine/view/text~Text}. Instance of this class is created by\n * {@link module:engine/view/treewalker~TreeWalker} when only a part of {@link module:engine/view/text~Text} needs to be returned.\n *\n * `TextProxy` has an API similar to {@link module:engine/view/text~Text Text} and allows to do most of the common tasks performed\n * on view nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/view/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is a readonly interface.\n *\n * **Note:** `TextProxy` instances are created on the fly basing on the current state of parent {@link module:engine/view/text~Text}.\n * Because of this it is highly unrecommended to store references to `TextProxy instances because they might get\n * invalidated due to operations on Document. Also TextProxy is not a {@link module:engine/view/node~Node} so it can not be\n * inserted as a child of {@link module:engine/view/element~Element}.\n *\n * `TextProxy` instances are created by {@link module:engine/view/treewalker~TreeWalker view tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/view/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/view/textproxy~TextProxy#textNode text node}\n\t * from which the text proxy starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/text~Text} element which TextProxy is a substring.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/text~Text} module:engine/view/textproxy~TextProxy#textNode\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given offsetInText value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.' );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given length value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-length: Given length value is incorrect.' );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/view/textproxy~TextProxy#data\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in the `textNode` where this `TextProxy` instance starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/textproxy~TextProxy#offsetInText\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/view/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/view/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/view/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.data.length !== this.textNode.data.length;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this text proxy, or `null` if the text proxy is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this.textNode.document;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'textProxy';\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` {#textNode} will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to\n\t * root element, otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this.textNode : this.parent;\n\n\t\twhile ( parent !== null ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/objecttomap\n */\n\n/**\n * Transforms object to map.\n *\n *\t\tconst map = objectToMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap.get( 'foo' ); // 1\n *\n * @param {Object} obj Object to transform.\n * @returns {Map} Map created from object.\n */\nexport default function objectToMap( obj ) {\n\tconst map = new Map();\n\n\tfor ( const key in obj ) {\n\t\tmap.set( key, obj[ key ] );\n\t}\n\n\treturn map;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/isiterable\n */\n\n/**\n * Checks if value implements iterator interface.\n *\n * @param {*} value The value to check.\n * @returns {Boolean} True if value implements iterator interface.\n */\nexport default function isIterable( value ) {\n\treturn !!( value && value[ Symbol.iterator ] );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/matcher\n */\n\n/**\n * View matcher class.\n * Instance of this class can be used to find {@link module:engine/view/element~Element elements} that match given pattern.\n */\nexport default class Matcher {\n\t/**\n\t * Creates new instance of Matcher.\n\t *\n\t * @param {String|RegExp|Object} [pattern] Match patterns. See {@link module:engine/view/matcher~Matcher#add add method} for\n\t * more information.\n\t */\n\tconstructor( ...pattern ) {\n\t\t/**\n\t\t * @private\n\t\t * @type {Array<String|RegExp|Object>}\n\t\t */\n\t\tthis._patterns = [];\n\n\t\tthis.add( ...pattern );\n\t}\n\n\t/**\n\t * Adds pattern or patterns to matcher instance.\n\t *\n\t *\t\t// String.\n\t *\t\tmatcher.add( 'div' );\n\t *\n\t *\t\t// Regular expression.\n\t *\t\tmatcher.add( /^\\w/ );\n\t *\n\t *\t\t// Single class.\n\t *\t\tmatcher.add( {\n\t *\t\t\tclasses: 'foobar'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/view/matcher~MatcherPattern} for more examples.\n\t *\n\t * Multiple patterns can be added in one call:\n\t *\n\t * \t\tmatcher.add( 'div', { classes: 'foobar' } );\n\t *\n\t * @param {Object|String|RegExp|Function} pattern Object describing pattern details. If string or regular expression\n\t * is provided it will be used to match element's name. Pattern can be also provided in a form\n\t * of a function - then this function will be called with each {@link module:engine/view/element~Element element} as a parameter.\n\t * Function's return value will be stored under `match` key of the object returned from\n\t * {@link module:engine/view/matcher~Matcher#match match} or {@link module:engine/view/matcher~Matcher#matchAll matchAll} methods.\n\t * @param {String|RegExp} [pattern.name] Name or regular expression to match element's name.\n\t * @param {Object} [pattern.attributes] Object with key-value pairs representing attributes to match. Each object key\n\t * represents attribute name. Value under that key can be either:\n\t * * `true` - then attribute is just required (can be empty),\n\t * * a string - then attribute has to be equal, or\n\t * * a regular expression - then attribute has to match the expression.\n\t * @param {String|RegExp|Array} [pattern.classes] Class name or array of class names to match. Each name can be\n\t * provided in a form of string or regular expression.\n\t * @param {Object} [pattern.styles] Object with key-value pairs representing styles to match. Each object key\n\t * represents style name. Value under that key can be either a string or a regular expression and it will be used\n\t * to match style value.\n\t */\n\tadd( ...pattern ) {\n\t\tfor ( let item of pattern ) {\n\t\t\t// String or RegExp pattern is used as element's name.\n\t\t\tif ( typeof item == 'string' || item instanceof RegExp ) {\n\t\t\t\titem = { name: item };\n\t\t\t}\n\n\t\t\t// Single class name/RegExp can be provided.\n\t\t\tif ( item.classes && ( typeof item.classes == 'string' || item.classes instanceof RegExp ) ) {\n\t\t\t\titem.classes = [ item.classes ];\n\t\t\t}\n\n\t\t\tthis._patterns.push( item );\n\t\t}\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns match information about first found\n\t * {@link module:engine/view/element~Element element}, otherwise returns `null`.\n\t *\n\t * Example of returned object:\n\t *\n\t *\t\t{\n\t *\t\t\telement: <instance of found element>,\n\t *\t\t\tpattern: <pattern used to match found element>,\n\t *\t\t\tmatch: {\n\t *\t\t\t\tname: true,\n\t *\t\t\t\tattributes: [ 'title', 'href' ],\n\t *\t\t\t\tclasses: [ 'foo' ],\n\t *\t\t\t\tstyles: [ 'color', 'position' ]\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#matchAll\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Object|null} result\n\t * @returns {module:engine/view/element~Element} result.element Matched view element.\n\t * @returns {Object|String|RegExp|Function} result.pattern Pattern that was used to find matched element.\n\t * @returns {Object} result.match Object representing matched element parts.\n\t * @returns {Boolean} [result.match.name] True if name of the element was matched.\n\t * @returns {Array} [result.match.attributes] Array with matched attribute names.\n\t * @returns {Array} [result.match.classes] Array with matched class names.\n\t * @returns {Array} [result.match.styles] Array with matched style names.\n\t */\n\tmatch( ...element ) {\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns array of match information with all found\n\t * {@link module:engine/view/element~Element elements}. If no element is found - returns `null`.\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#match\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Array.<Object>|null} Array with match information about found elements or `null`. For more information\n\t * see {@link module:engine/view/matcher~Matcher#match match method} description.\n\t */\n\tmatchAll( ...element ) {\n\t\tconst results = [];\n\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\tresults.push( {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn results.length > 0 ? results : null;\n\t}\n\n\t/**\n\t * Returns the name of the element to match if there is exactly one pattern added to the matcher instance\n\t * and it matches element name defined by `string` (not `RegExp`). Otherwise, returns `null`.\n\t *\n\t * @returns {String|null} Element name trying to match.\n\t */\n\tgetElementName() {\n\t\tif ( this._patterns.length !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst pattern = this._patterns[ 0 ];\n\t\tconst name = pattern.name;\n\n\t\treturn ( typeof pattern != 'function' && name && !( name instanceof RegExp ) ) ? name : null;\n\t}\n}\n\n// Returns match information if {@link module:engine/view/element~Element element} is matching provided pattern.\n// If element cannot be matched to provided pattern - returns `null`.\n//\n// @param {module:engine/view/element~Element} element\n// @param {Object|String|RegExp|Function} pattern\n// @returns {Object|null} Returns object with match information or null if element is not matching.\nfunction isElementMatching( element, pattern ) {\n\t// If pattern is provided as function - return result of that function;\n\tif ( typeof pattern == 'function' ) {\n\t\treturn pattern( element );\n\t}\n\n\tconst match = {};\n\t// Check element's name.\n\tif ( pattern.name ) {\n\t\tmatch.name = matchName( pattern.name, element.name );\n\n\t\tif ( !match.name ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's attributes.\n\tif ( pattern.attributes ) {\n\t\tmatch.attributes = matchAttributes( pattern.attributes, element );\n\n\t\tif ( !match.attributes ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's classes.\n\tif ( pattern.classes ) {\n\t\tmatch.classes = matchClasses( pattern.classes, element );\n\n\t\tif ( !match.classes ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t// Check element's styles.\n\tif ( pattern.styles ) {\n\t\tmatch.styles = matchStyles( pattern.styles, element );\n\n\t\tif ( !match.styles ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if name can be matched by provided pattern.\n//\n// @param {String|RegExp} pattern\n// @param {String} name\n// @returns {Boolean} Returns `true` if name can be matched, `false` otherwise.\nfunction matchName( pattern, name ) {\n\t// If pattern is provided as RegExp - test against this regexp.\n\tif ( pattern instanceof RegExp ) {\n\t\treturn pattern.test( name );\n\t}\n\n\treturn pattern === name;\n}\n\n// Checks if attributes of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about attributes to match. Each key of the object will be\n// used as attribute name. Value of each key can be a string or regular expression to match against attribute value.\n// @param {module:engine/view/element~Element} element Element which attributes will be tested.\n// @returns {Array|null} Returns array with matched attribute names or `null` if no attributes were matched.\nfunction matchAttributes( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasAttribute( name ) ) {\n\t\t\tconst attribute = element.getAttribute( name );\n\n\t\t\tif ( pattern === true ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else if ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( attribute ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( attribute === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if classes of provided element can be matched against provided patterns.\n//\n// @param {Array.<String|RegExp>} patterns Array of strings or regular expressions to match against element's classes.\n// @param {module:engine/view/element~Element} element Element which classes will be tested.\n// @returns {Array|null} Returns array with matched class names or `null` if no classes were matched.\nfunction matchClasses( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const pattern of patterns ) {\n\t\tif ( pattern instanceof RegExp ) {\n\t\t\tconst classes = element.getClassNames();\n\n\t\t\tfor ( const name of classes ) {\n\t\t\t\tif ( pattern.test( name ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( match.length === 0 ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else if ( element.hasClass( pattern ) ) {\n\t\t\tmatch.push( pattern );\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if styles of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about styles to match. Each key of the object will be\n// used as style name. Value of each key can be a string or regular expression to match against style value.\n// @param {module:engine/view/element~Element} element Element which styles will be tested.\n// @returns {Array|null} Returns array with matched style names or `null` if no styles were matched.\nfunction matchStyles( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasStyle( name ) ) {\n\t\t\tconst style = element.getStyle( name );\n\n\t\t\tif ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( style ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( style === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n/**\n * An entity that is a valid pattern recognized by a matcher. `MatcherPattern` is used by {@link ~Matcher} to recognize\n * if a view element fits in a group of view elements described by the pattern.\n *\n * `MatcherPattern` can be given as a `String`, a `RegExp`, an `Object` or a `Function`.\n *\n * If `MatcherPattern` is given as a `String` or `RegExp`, it will match any view element that has a matching name:\n *\n *\t\t// Match any element with name equal to 'div'.\n *\t\tconst pattern = 'div';\n *\n *\t\t// Match any element which name starts on 'p'.\n *\t\tconst pattern = /^p/;\n *\n * If `MatcherPattern` is given as an `Object`, all the object's properties will be matched with view element properties.\n *\n *\t\t// Match view element's name.\n *\t\tconst pattern = { name: /^p/ };\n *\n *\t\t// Match view element which has matching attributes.\n *\t\tconst pattern = {\n *\t\t\tattribute: {\n *\t\t\t\ttitle: 'foobar',\t// Attribute title should equal 'foobar'.\n *\t\t\t\tfoo: /^\\w+/,\t\t// Attribute foo should match /^\\w+/ regexp.\n *\t\t\t\tbar: true\t\t\t// Attribute bar should be set (can be empty).\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Match view element which has given class.\n *\t\tconst pattern = {\n *\t\t\tclasses: 'foobar'\n *\t\t};\n *\n *\t\t// Match view element class using regular expression.\n *\t\tconst pattern = {\n *\t\t\tclasses: /foo.../\n *\t\t};\n *\n *\t\t// Multiple classes to match.\n *\t\tconst pattern = {\n *\t\t\tclasses: [ 'baz', 'bar', /foo.../ ]\n *\t\t}:\n *\n *\t\t// Match view element which has given styles.\n *\t\tconst pattern = {\n *\t\t\tstyles: {\n *\t\t\t\tposition: 'absolute',\n *\t\t\t\tcolor: /^\\w*blue$/\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Pattern with multiple properties.\n *\t\tconst pattern = {\n *\t\t\tname: 'span',\n *\t\t\tstyles: {\n *\t\t\t\t'font-weight': 'bold'\n *\t\t\t},\n *\t\t\tclasses: 'highlighted'\n *\t\t};\n *\n * If `MatcherPattern` is given as a `Function`, the function takes a view element as a first and only parameter and\n * the function should decide whether that element matches. If so, it should return what part of the view element has been matched.\n * Otherwise, the function should return `null`. The returned result will be included in `match` property of the object\n * returned by {@link ~Matcher#match} call.\n *\n *\t\t// Match an empty <div> element.\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'div' && element.childCount > 0 ) {\n *\t\t\t\t// Return which part of the element was matched.\n *\t\t\t\treturn { name: true };\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n *\t\t// Match a <p> element with big font (\"heading-like\" element).\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'p' ) {\n *\t\t\t\tconst fontSize = element.getStyle( 'font-size' );\n *\t\t\t\tconst size = fontSize.match( /(\\d+)/px );\n *\n *\t\t\t\tif ( size && Number( size[ 1 ] ) > 26 ) {\n *\t\t\t\t\treturn { name: true, attribute: [ 'font-size' ] };\n *\t\t\t\t}\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n * `MatcherPattern` is defined in a way that it is a superset of {@link module:engine/view/elementdefinition~ElementDefinition},\n * that is, every `ElementDefinition` also can be used as a `MatcherPattern`.\n *\n * @typedef {String|RegExp|Object|Function} module:engine/view/matcher~MatcherPattern\n *\n * @property {String|RegExp} [name] View element name to match.\n * @property {String|RegExp|Array.<String|RegExp>} [classes] View element's class name(s) to match.\n * @property {Object} [styles] Object with key-value pairs representing styles to match.\n * Each object key represents style name. Value can be given as `String` or `RegExp`.\n * @property {Object} [attributes] Object with key-value pairs representing attributes to match.\n * Each object key represents attribute name. Value can be given as `String` or `RegExp`.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/element\n */\n\nimport Node from './node';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport objectToMap from '@ckeditor/ckeditor5-utils/src/objecttomap';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport isPlainObject from '@ckeditor/ckeditor5-utils/src/lib/lodash/isPlainObject';\nimport Matcher from './matcher';\n\n/**\n * View element.\n *\n * The editing engine does not define a fixed semantics of its elements (it is \"DTD-free\").\n * This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. When creating an element you should use one of the following methods:\n *\n * * {@link module:engine/view/writer~Writer#createContainerElement `writer.createContainerElement()`} in order to create\n * a {@link module:engine/view/containerelement~ContainerElement},\n * * {@link module:engine/view/writer~Writer#createAttributeElement `writer.createAttributeElement()`} in order to create\n * a {@link module:engine/view/attributeelement~AttributeElement},\n * * {@link module:engine/view/writer~Writer#createEmptyElement `writer.createEmptyElement()`} in order to create\n * a {@link module:engine/view/emptyelement~EmptyElement}.\n * * {@link module:engine/view/writer~Writer#createUIElement `writer.createUIElement()`} in order to create\n * a {@link module:engine/view/uielement~UIElement}.\n * * {@link module:engine/view/writer~Writer#createEditableElement `writer.createEditableElement()`} in order to create\n * a {@link module:engine/view/editableelement~EditableElement}.\n *\n * Note that for view elements which are not created from the model, like elements from mutations, paste or\n * {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element, so\n * these will be instances of the {@link module:engine/view/element~Element}.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a view element.\n\t *\n\t * Attributes can be passed in various formats:\n\t *\n\t *\t\tnew Element( 'div', { 'class': 'editor', 'contentEditable': 'true' } ); // object\n\t *\t\tnew Element( 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator\n\t *\t\tnew Element( 'div', mapOfAttributes ); // map\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code. Use the\n\t * {@link module:engine/view/writer~Writer#createAttributeElement} for inline element,\n\t * {@link module:engine/view/writer~Writer#createContainerElement} for block element,\n\t * {@link module:engine/view/writer~Writer#createEditableElement} for editable element,\n\t * {@link module:engine/view/writer~Writer#createEmptyElement} for empty element or\n\t * {@link module:engine/view/writer~Writer#createUIElement} for UI element instead.\n\t *\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * List of nodes to be inserted into created element.\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * Name of the element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Map of attributes, where attributes names are keys and attributes values are values.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} #_attrs\n\t\t */\n\t\tthis._attrs = parseAttributes( attrs );\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\n\t\t/**\n\t\t * Set of classes associated with element instance.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._classes = new Set();\n\n\t\tif ( this._attrs.has( 'class' ) ) {\n\t\t\t// Remove class attribute and handle it by class set.\n\t\t\tconst classString = this._attrs.get( 'class' );\n\t\t\tparseClasses( this._classes, classString );\n\t\t\tthis._attrs.delete( 'class' );\n\t\t}\n\n\t\t/**\n\t\t * Map of styles.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set} module:engine/view/element~Element#_styles\n\t\t */\n\t\tthis._styles = new Map();\n\n\t\tif ( this._attrs.has( 'style' ) ) {\n\t\t\t// Remove style attribute and handle it by styles map.\n\t\t\tparseInlineStyles( this._styles, this._attrs.get( 'style' ) );\n\t\t\tthis._attrs.delete( 'style' );\n\t\t}\n\n\t\t/**\n\t\t * Map of custom properties.\n\t\t * Custom properties can be added to element instance, will be cloned but not rendered into DOM.\n\t\t *\n\t\t * @protected\n\t\t * @memeber {Map}\n\t\t */\n\t\tthis._customProperties = new Map();\n\t}\n\n\t/**\n\t * Number of element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._children.length === 0;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'element' || type == this.name || super.is( type );\n\t\t} else {\n\t\t\treturn type == 'element' && name == this.name;\n\t\t}\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.\n\t *\n\t * @returns {Iterable.<String>} Keys for attributes.\n\t */\n\t* getAttributeKeys() {\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield 'class';\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield 'style';\n\t\t}\n\n\t\t// This is not an optimal solution because of https://github.com/ckeditor/ckeditor5-engine/issues/454.\n\t\t// It can be simplified to `yield* this._attrs.keys();`.\n\t\tfor ( const key of this._attrs.keys() ) {\n\t\t\tyield key;\n\t\t}\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this element's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getAttributes() {\n\t\tyield* this._attrs.entries();\n\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield [ 'class', this.getAttribute( 'class' ) ];\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield [ 'style', this.getAttribute( 'style' ) ];\n\t\t}\n\t}\n\n\t/**\n\t * Gets attribute by key. If attribute is not present - returns undefined.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {String|undefined} Attribute value.\n\t */\n\tgetAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\treturn [ ...this._classes ].join( ' ' );\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tlet styleString = '';\n\n\t\t\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\t\t\tstyleString += `${ property }:${ value };`;\n\t\t\t\t}\n\n\t\t\t\treturn styleString;\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns a boolean indicating whether an attribute with the specified key exists in the element.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.\n\t */\n\thasAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\treturn this._classes.size > 0;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\treturn this._styles.size > 0;\n\t\t}\n\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t * Both elements should have the same name and attributes to be considered as similar. Two similar elements\n\t * can contain different set of children nodes.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\tif ( !( otherElement instanceof Element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If exactly the same Element is provided - return true immediately.\n\t\tif ( this === otherElement ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check element name.\n\t\tif ( this.name != otherElement.name ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check number of attributes, classes and styles.\n\t\tif ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||\n\t\t\tthis._styles.size !== otherElement._styles.size ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes are the same.\n\t\tfor ( const [ key, value ] of this._attrs ) {\n\t\t\tif ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if classes are the same.\n\t\tfor ( const className of this._classes ) {\n\t\t\tif ( !otherElement._classes.has( className ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles are the same.\n\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\tif ( !otherElement._styles.has( property ) || otherElement._styles.get( property ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns true if class is present.\n\t * If more then one class is provided - returns true only when all classes are present.\n\t *\n\t *\t\telement.hasClass( 'foo' ); // Returns true if 'foo' class is present.\n\t *\t\telement.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.\n\t *\n\t * @param {...String} className\n\t */\n\thasClass( ...className ) {\n\t\tfor ( const name of className ) {\n\t\t\tif ( !this._classes.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns iterator that contains all class names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetClassNames() {\n\t\treturn this._classes.keys();\n\t}\n\n\t/**\n\t * Returns style value for given property.\n\t * Undefined is returned if style does not exist.\n\t *\n\t * @param {String} property\n\t * @returns {String|undefined}\n\t */\n\tgetStyle( property ) {\n\t\treturn this._styles.get( property );\n\t}\n\n\t/**\n\t * Returns iterator that contains all style names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetStyleNames() {\n\t\treturn this._styles.keys();\n\t}\n\n\t/**\n\t * Returns true if style keys are present.\n\t * If more then one style property is provided - returns true only when all properties are present.\n\t *\n\t *\t\telement.hasStyle( 'color' ); // Returns true if 'border-top' style is present.\n\t *\t\telement.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.\n\t *\n\t * @param {...String} property\n\t */\n\thasStyle( ...property ) {\n\t\tfor ( const name of property ) {\n\t\t\tif ( !this._styles.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns ancestor element that match specified pattern.\n\t * Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.\n\t *\n\t * @see module:engine/view/matcher~Matcher\n\t * @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.\n\t * See {@link module:engine/view/matcher~Matcher}.\n\t * @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.\n\t */\n\tfindAncestor( ...patterns ) {\n\t\tconst matcher = new Matcher( ...patterns );\n\t\tlet parent = this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( matcher.match( parent ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the custom property value for the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @returns {*}\n\t */\n\tgetCustomProperty( key ) {\n\t\treturn this._customProperties.get( key );\n\t}\n\n\t/**\n\t * Returns an iterator which iterates over this element's custom properties.\n\t * Iterator provides `[ key, value ]` pairs for each stored property.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getCustomProperties() {\n\t\tyield* this._customProperties.entries();\n\t}\n\n\t/**\n\t * Returns identity string based on element's name, styles, classes and other attributes.\n\t * Two elements that {@link #isSimilar are similar} will have same identity string.\n\t * It has the following format:\n\t *\n\t *\t\t'name class=\"class1,class2\" style=\"style1:value1;style2:value2\" attr1=\"val1\" attr2=\"val2\"'\n \t *\n\t * For example:\n\t *\n\t *\t\tconst element = writer.createContainerElement( 'foo', {\n\t *\t\t\tbanana: '10',\n\t *\t\t\tapple: '20',\n\t *\t\t\tstyle: 'color: red; border-color: white;',\n\t *\t\t\tclass: 'baz'\n\t *\t\t} );\n\t *\n\t *\t\t// returns 'foo class=\"baz\" style=\"border-color:white;color:red\" apple=\"20\" banana=\"10\"'\n\t *\t\telement.getIdentity();\n\t *\n\t * NOTE: Classes, styles and other attributes are sorted alphabetically.\n\t *\n\t * @returns {String}\n\t */\n\tgetIdentity() {\n\t\tconst classes = Array.from( this._classes ).sort().join( ',' );\n\t\tconst styles = Array.from( this._styles ).map( i => `${ i[ 0 ] }:${ i[ 1 ] }` ).sort().join( ';' );\n\t\tconst attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }=\"${ i[ 1 ] }\"` ).sort().join( ' ' );\n\n\t\treturn this.name +\n\t\t\t( classes == '' ? '' : ` class=\"${ classes }\"` ) +\n\t\t\t( styles == '' ? '' : ` style=\"${ styles }\"` ) +\n\t\t\t( attributes == '' ? '' : ` ${ attributes }` );\n\t}\n\n\t/**\n\t * Clones provided element.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/element~Element} Clone of this element.\n\t */\n\t_clone( deep = false ) {\n\t\tconst childrenClone = [];\n\n\t\tif ( deep ) {\n\t\t\tfor ( const child of this.getChildren() ) {\n\t\t\t\tchildrenClone.push( child._clone( deep ) );\n\t\t\t}\n\t\t}\n\n\t\t// ContainerElement and AttributeElement should be also cloned properly.\n\t\tconst cloned = new this.constructor( this.name, this._attrs, childrenClone );\n\n\t\t// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and\n\t\t// parse once again in constructor.\n\t\tcloned._classes = new Set( this._classes );\n\t\tcloned._styles = new Map( this._styles );\n\n\t\t// Clone custom properties.\n\t\tcloned._customProperties = new Map( this._customProperties );\n\n\t\t// Clone filler offset method.\n\t\t// We can't define this method in a prototype because it's behavior which\n\t\t// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.\n\t\tcloned.getFillerOffset = this.getFillerOffset;\n\n\t\treturn cloned;\n\t}\n\n\t/**\n\t * {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node\n\t * and sets the parent of these nodes to this element.\n\t *\n\t * @see module:engine/view/writer~Writer#insert\n\t * @protected\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this element.\n\t *\n\t * @see module:engine/view/writer~Writer#insert\n\t * @protected\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @see module:engine/view/writer~Writer#remove\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Adds or overwrite attribute with a specified key and value.\n\t *\n\t * @see module:engine/view/writer~Writer#setAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setAttribute( key, value ) {\n\t\tvalue = String( value );\n\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( key == 'class' ) {\n\t\t\tparseClasses( this._classes, value );\n\t\t} else if ( key == 'style' ) {\n\t\t\tparseInlineStyles( this._styles, value );\n\t\t} else {\n\t\t\tthis._attrs.set( key, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t * @see module:engine/view/writer~Writer#removeAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} Returns true if an attribute existed and has been removed.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\t// Remove class attribute.\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\tthis._classes.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove style attribute.\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tthis._styles.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove other attributes.\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Adds specified class.\n\t *\n\t *\t\telement._addClass( 'foo' ); // Adds 'foo' class.\n\t *\t\telement._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/writer~Writer#addClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_addClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.add( name ) );\n\t}\n\n\t/**\n\t * Removes specified class.\n\t *\n\t *\t\telement._removeClass( 'foo' );  // Removes 'foo' class.\n\t *\t\telement._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/writer~Writer#removeClass\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.delete( name ) );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\telement._setStyle( 'color', 'red' );\n\t *\t\telement._setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t} );\n\t *\n\t * @see module:engine/view/writer~Writer#setStyle\n\t * @protected\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setStyle( property, value ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( isPlainObject( property ) ) {\n\t\t\tconst keys = Object.keys( property );\n\n\t\t\tfor ( const key of keys ) {\n\t\t\t\tthis._styles.set( key, property[ key ] );\n\t\t\t}\n\t\t} else {\n\t\t\tthis._styles.set( property, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes specified style.\n\t *\n\t *\t\telement._removeStyle( 'color' );  // Removes 'color' style.\n\t *\t\telement._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * @see module:engine/view/writer~Writer#removeStyle\n\t * @protected\n\t * @param {Array.<String>|String} property\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeStyle( property ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tproperty = Array.isArray( property ) ? property : [ property ];\n\t\tproperty.forEach( name => this._styles.delete( name ) );\n\t}\n\n\t/**\n\t * Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @see module:engine/view/writer~Writer#setCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t */\n\t_setCustomProperty( key, value ) {\n\t\tthis._customProperties.set( key, value );\n\t}\n\n\t/**\n\t * Removes the custom property stored under the given key.\n\t *\n\t * @see module:engine/view/writer~Writer#removeCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\t_removeCustomProperty( key ) {\n\t\treturn this._customProperties.delete( key );\n\t}\n\n\t/**\n\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t *\n\t * @abstract\n\t * @method module:engine/view/element~Element#getFillerOffset\n\t */\n}\n\n// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed\n// as an object (instead of `Map`), the object is transformed to the map. Attributes with `null` value are removed.\n// Attributes with non-`String` value are converted to `String`.\n//\n// @param {Object|Map} attrs Attributes to parse.\n// @returns {Map} Parsed attributes.\nfunction parseAttributes( attrs ) {\n\tif ( isPlainObject( attrs ) ) {\n\t\tattrs = objectToMap( attrs );\n\t} else {\n\t\tattrs = new Map( attrs );\n\t}\n\n\tfor ( const [ key, value ] of attrs ) {\n\t\tif ( value === null ) {\n\t\t\tattrs.delete( key );\n\t\t} else if ( typeof value != 'string' ) {\n\t\t\tattrs.set( key, String( value ) );\n\t\t}\n\t}\n\n\treturn attrs;\n}\n\n// Parses inline styles and puts property - value pairs into styles map.\n// Styles map is cleared before insertion.\n//\n// @param {Map.<String, String>} stylesMap Map to insert parsed properties and values.\n// @param {String} stylesString Styles to parse.\nfunction parseInlineStyles( stylesMap, stylesString ) {\n\t// `null` if no quote was found in input string or last found quote was a closing quote. See below.\n\tlet quoteType = null;\n\tlet propertyNameStart = 0;\n\tlet propertyValueStart = 0;\n\tlet propertyName = null;\n\n\tstylesMap.clear();\n\n\t// Do not set anything if input string is empty.\n\tif ( stylesString === '' ) {\n\t\treturn;\n\t}\n\n\t// Fix inline styles that do not end with `;` so they are compatible with algorithm below.\n\tif ( stylesString.charAt( stylesString.length - 1 ) != ';' ) {\n\t\tstylesString = stylesString + ';';\n\t}\n\n\t// Seek the whole string for \"special characters\".\n\tfor ( let i = 0; i < stylesString.length; i++ ) {\n\t\tconst char = stylesString.charAt( i );\n\n\t\tif ( quoteType === null ) {\n\t\t\t// No quote found yet or last found quote was a closing quote.\n\t\t\tswitch ( char ) {\n\t\t\t\tcase ':':\n\t\t\t\t\t// Most of time colon means that property name just ended.\n\t\t\t\t\t// Sometimes however `:` is found inside property value (for example in background image url).\n\t\t\t\t\tif ( !propertyName ) {\n\t\t\t\t\t\t// Treat this as end of property only if property name is not already saved.\n\t\t\t\t\t\t// Save property name.\n\t\t\t\t\t\tpropertyName = stylesString.substr( propertyNameStart, i - propertyNameStart );\n\t\t\t\t\t\t// Save this point as the start of property value.\n\t\t\t\t\t\tpropertyValueStart = i + 1;\n\t\t\t\t\t}\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase '\"':\n\t\t\t\tcase '\\'':\n\t\t\t\t\t// Opening quote found (this is an opening quote, because `quoteType` is `null`).\n\t\t\t\t\tquoteType = char;\n\n\t\t\t\t\tbreak;\n\n\t\t\t\t// eslint-disable-next-line no-case-declarations\n\t\t\t\tcase ';':\n\t\t\t\t\t// Property value just ended.\n\t\t\t\t\t// Use previously stored property value start to obtain property value.\n\t\t\t\t\tconst propertyValue = stylesString.substr( propertyValueStart, i - propertyValueStart );\n\n\t\t\t\t\tif ( propertyName ) {\n\t\t\t\t\t\t// Save parsed part.\n\t\t\t\t\t\tstylesMap.set( propertyName.trim(), propertyValue.trim() );\n\t\t\t\t\t}\n\n\t\t\t\t\tpropertyName = null;\n\n\t\t\t\t\t// Save this point as property name start. Property name starts immediately after previous property value ends.\n\t\t\t\t\tpropertyNameStart = i + 1;\n\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t} else if ( char === quoteType ) {\n\t\t\t// If a quote char is found and it is a closing quote, mark this fact by `null`-ing `quoteType`.\n\t\t\tquoteType = null;\n\t\t}\n\t}\n}\n\n// Parses class attribute and puts all classes into classes set.\n// Classes set s cleared before insertion.\n//\n// @param {Set.<String>} classesSet Set to insert parsed classes.\n// @param {String} classesString String with classes to parse.\nfunction parseClasses( classesSet, classesString ) {\n\tconst classArray = classesString.split( /\\s+/ );\n\tclassesSet.clear();\n\tclassArray.forEach( name => classesSet.add( name ) );\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @returns {Iterable.<module:engine/view/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/containerelement\n */\n\nimport Element from './element';\n\n/**\n * Containers are elements which define document structure. They define boundaries for\n * {@link module:engine/view/attributeelement~AttributeElement attributes}. They are mostly use for block elements like `<p>` or `<div>`.\n *\n * Editing engine does not define fixed HTML DTD. This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer.\n *\n * Creating an element you should use `ContainerElement` class or {@link module:engine/view/attributeelement~AttributeElement}. This is\n * important to define the type of the element because of two reasons:\n *\n * Firstly, {@link module:engine/view/domconverter~DomConverter} needs the information what is an editable block to convert elements to\n * DOM properly. {@link module:engine/view/domconverter~DomConverter} will ensure that `ContainerElement` is editable and it is possible\n * to put caret inside it, even if the container is empty.\n *\n * Secondly, {@link module:engine/view/writer~Writer view writer} uses this information.\n * Nodes {@link module:engine/view/writer~Writer#breakAttributes breaking} and {@link module:engine/view/writer~Writer#mergeAttributes\n * merging}\n * is performed only in a bounds of a container nodes.\n *\n * For instance if `<p>` is an container and `<b>` is attribute:\n *\n *\t\t<p><b>fo^o</b></p>\n *\n * {@link module:engine/view/writer~Writer#breakAttributes breakAttributes} will create:\n *\n *\t\t<p><b>fo</b><b>o</b></p>\n *\n * There might be a need to mark `<span>` element as a container node, for example in situation when it will be a\n * container of an inline widget:\n *\n *\t\t<span color=\"red\">foobar</span>\t\t// attribute\n *\t\t<span data-widget>foobar</span>\t\t// container\n *\n * @extends module:engine/view/element~Element\n */\nexport default class ContainerElement extends Element {\n\t/**\n\t * Creates a container element.\n\t *\n\t * @see module:engine/view/element~Element\n\t * @see module:engine/view/writer~Writer#createContainerElement\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'containerElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'containerElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n}\n\n// Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\tconst children = [ ...this.getChildren() ];\n\tconst lastChild = children[ this.childCount - 1 ];\n\n\t// Block filler is required after a `<br>` if it's the last element in its container. See #1422.\n\tif ( lastChild && lastChild.is( 'element', 'br' ) ) {\n\t\treturn this.childCount;\n\t}\n\n\tfor ( const child of children ) {\n\t\t// If there's any non-UI element – don't render the bogus.\n\t\tif ( !child.is( 'uiElement' ) ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// If there are only UI elements – render the bogus at the end of the element.\n\treturn this.childCount;\n}\n","import eq from './eq';\nimport isArrayLike from './isArrayLike';\nimport isIndex from './_isIndex';\nimport isObject from './isObject';\n\n/**\n * Checks if the given arguments are from an iteratee call.\n *\n * @private\n * @param {*} value The potential iteratee value argument.\n * @param {*} index The potential iteratee index or key argument.\n * @param {*} object The potential iteratee object argument.\n * @returns {boolean} Returns `true` if the arguments are from an iteratee call,\n *  else `false`.\n */\nfunction isIterateeCall(value, index, object) {\n  if (!isObject(object)) {\n    return false;\n  }\n  var type = typeof index;\n  if (type == 'number'\n        ? (isArrayLike(object) && isIndex(index, object.length))\n        : (type == 'string' && index in object)\n      ) {\n    return eq(object[index], value);\n  }\n  return false;\n}\n\nexport default isIterateeCall;\n","/**\n * A faster alternative to `Function#apply`, this function invokes `func`\n * with the `this` binding of `thisArg` and the arguments of `args`.\n *\n * @private\n * @param {Function} func The function to invoke.\n * @param {*} thisArg The `this` binding of `func`.\n * @param {Array} args The arguments to invoke `func` with.\n * @returns {*} Returns the result of `func`.\n */\nfunction apply(func, thisArg, args) {\n  var length = args.length;\n  switch (length) {\n    case 0: return func.call(thisArg);\n    case 1: return func.call(thisArg, args[0]);\n    case 2: return func.call(thisArg, args[0], args[1]);\n    case 3: return func.call(thisArg, args[0], args[1], args[2]);\n  }\n  return func.apply(thisArg, args);\n}\n\nexport default apply;\n","import isObjectLike from './isObjectLike';\n\n/** `Object#toString` result references. */\nvar symbolTag = '[object Symbol]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/**\n * Checks if `value` is classified as a `Symbol` primitive or object.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isSymbol(Symbol.iterator);\n * // => true\n *\n * _.isSymbol('abc');\n * // => false\n */\nfunction isSymbol(value) {\n  return typeof value == 'symbol' ||\n    (isObjectLike(value) && objectToString.call(value) == symbolTag);\n}\n\nexport default isSymbol;\n","import isFunction from './isFunction';\nimport isObject from './isObject';\nimport isSymbol from './isSymbol';\n\n/** Used as references for various `Number` constants. */\nvar NAN = 0 / 0;\n\n/** Used to match leading and trailing whitespace. */\nvar reTrim = /^\\s+|\\s+$/g;\n\n/** Used to detect bad signed hexadecimal string values. */\nvar reIsBadHex = /^[-+]0x[0-9a-f]+$/i;\n\n/** Used to detect binary string values. */\nvar reIsBinary = /^0b[01]+$/i;\n\n/** Used to detect octal string values. */\nvar reIsOctal = /^0o[0-7]+$/i;\n\n/** Built-in method references without a dependency on `root`. */\nvar freeParseInt = parseInt;\n\n/**\n * Converts `value` to a number.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {number} Returns the number.\n * @example\n *\n * _.toNumber(3.2);\n * // => 3.2\n *\n * _.toNumber(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toNumber(Infinity);\n * // => Infinity\n *\n * _.toNumber('3.2');\n * // => 3.2\n */\nfunction toNumber(value) {\n  if (typeof value == 'number') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return NAN;\n  }\n  if (isObject(value)) {\n    var other = isFunction(value.valueOf) ? value.valueOf() : value;\n    value = isObject(other) ? (other + '') : other;\n  }\n  if (typeof value != 'string') {\n    return value === 0 ? value : +value;\n  }\n  value = value.replace(reTrim, '');\n  var isBinary = reIsBinary.test(value);\n  return (isBinary || reIsOctal.test(value))\n    ? freeParseInt(value.slice(2), isBinary ? 2 : 8)\n    : (reIsBadHex.test(value) ? NAN : +value);\n}\n\nexport default toNumber;\n","import toNumber from './toNumber';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0,\n    MAX_INTEGER = 1.7976931348623157e+308;\n\n/**\n * Converts `value` to a finite number.\n *\n * @static\n * @memberOf _\n * @since 4.12.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted number.\n * @example\n *\n * _.toFinite(3.2);\n * // => 3.2\n *\n * _.toFinite(Number.MIN_VALUE);\n * // => 5e-324\n *\n * _.toFinite(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toFinite('3.2');\n * // => 3.2\n */\nfunction toFinite(value) {\n  if (!value) {\n    return value === 0 ? value : 0;\n  }\n  value = toNumber(value);\n  if (value === INFINITY || value === -INFINITY) {\n    var sign = (value < 0 ? -1 : 1);\n    return sign * MAX_INTEGER;\n  }\n  return value === value ? value : 0;\n}\n\nexport default toFinite;\n","import toFinite from './toFinite';\n\n/**\n * Converts `value` to an integer.\n *\n * **Note:** This function is loosely based on\n * [`ToInteger`](http://www.ecma-international.org/ecma-262/6.0/#sec-tointeger).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toInteger(3.2);\n * // => 3\n *\n * _.toInteger(Number.MIN_VALUE);\n * // => 0\n *\n * _.toInteger(Infinity);\n * // => 1.7976931348623157e+308\n *\n * _.toInteger('3.2');\n * // => 3\n */\nfunction toInteger(value) {\n  var result = toFinite(value),\n      remainder = result % 1;\n\n  return result === result ? (remainder ? result - remainder : result) : 0;\n}\n\nexport default toInteger;\n","import apply from './_apply';\nimport toInteger from './toInteger';\n\n/** Used as the `TypeError` message for \"Functions\" methods. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * Creates a function that invokes `func` with the `this` binding of the\n * created function and arguments from `start` and beyond provided as\n * an array.\n *\n * **Note:** This method is based on the\n * [rest parameter](https://mdn.io/rest_parameters).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Function\n * @param {Function} func The function to apply a rest parameter to.\n * @param {number} [start=func.length-1] The start position of the rest parameter.\n * @returns {Function} Returns the new function.\n * @example\n *\n * var say = _.rest(function(what, names) {\n *   return what + ' ' + _.initial(names).join(', ') +\n *     (_.size(names) > 1 ? ', & ' : '') + _.last(names);\n * });\n *\n * say('hello', 'fred', 'barney', 'pebbles');\n * // => 'hello fred, barney, & pebbles'\n */\nfunction rest(func, start) {\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  start = nativeMax(start === undefined ? (func.length - 1) : toInteger(start), 0);\n  return function() {\n    var args = arguments,\n        index = -1,\n        length = nativeMax(args.length - start, 0),\n        array = Array(length);\n\n    while (++index < length) {\n      array[index] = args[start + index];\n    }\n    switch (start) {\n      case 0: return func.call(this, array);\n      case 1: return func.call(this, args[0], array);\n      case 2: return func.call(this, args[0], args[1], array);\n    }\n    var otherArgs = Array(start + 1);\n    index = -1;\n    while (++index < start) {\n      otherArgs[index] = args[index];\n    }\n    otherArgs[start] = array;\n    return apply(func, this, otherArgs);\n  };\n}\n\nexport default rest;\n","import isIterateeCall from './_isIterateeCall';\nimport rest from './rest';\n\n/**\n * Creates a function like `_.assign`.\n *\n * @private\n * @param {Function} assigner The function to assign values.\n * @returns {Function} Returns the new assigner function.\n */\nfunction createAssigner(assigner) {\n  return rest(function(object, sources) {\n    var index = -1,\n        length = sources.length,\n        customizer = length > 1 ? sources[length - 1] : undefined,\n        guard = length > 2 ? sources[2] : undefined;\n\n    customizer = (assigner.length > 3 && typeof customizer == 'function')\n      ? (length--, customizer)\n      : undefined;\n\n    if (guard && isIterateeCall(sources[0], sources[1], guard)) {\n      customizer = length < 3 ? undefined : customizer;\n      length = 1;\n    }\n    object = Object(object);\n    while (++index < length) {\n      var source = sources[index];\n      if (source) {\n        assigner(object, source, index, customizer);\n      }\n    }\n    return object;\n  });\n}\n\nexport default createAssigner;\n","import root from './_root';\n\n/** Built-in value references. */\nvar Reflect = root.Reflect;\n\nexport default Reflect;\n","/**\n * Converts `iterator` to an array.\n *\n * @private\n * @param {Object} iterator The iterator to convert.\n * @returns {Array} Returns the converted array.\n */\nfunction iteratorToArray(iterator) {\n  var data,\n      result = [];\n\n  while (!(data = iterator.next()).done) {\n    result.push(data.value);\n  }\n  return result;\n}\n\nexport default iteratorToArray;\n","import Reflect from './_Reflect';\nimport iteratorToArray from './_iteratorToArray';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Built-in value references. */\nvar enumerate = Reflect ? Reflect.enumerate : undefined,\n    propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/**\n * The base implementation of `_.keysIn` which doesn't skip the constructor\n * property of prototypes or treat sparse arrays as dense.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n */\nfunction baseKeysIn(object) {\n  object = object == null ? object : Object(object);\n\n  var result = [];\n  for (var key in object) {\n    result.push(key);\n  }\n  return result;\n}\n\n// Fallback for IE < 9 with es6-shim.\nif (enumerate && !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf')) {\n  baseKeysIn = function(object) {\n    return iteratorToArray(enumerate(object));\n  };\n}\n\nexport default baseKeysIn;\n","import baseKeysIn from './_baseKeysIn';\nimport indexKeys from './_indexKeys';\nimport isIndex from './_isIndex';\nimport isPrototype from './_isPrototype';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * Creates an array of the own and inherited enumerable property names of `object`.\n *\n * **Note:** Non-object values are coerced to objects.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the array of property names.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.keysIn(new Foo);\n * // => ['a', 'b', 'c'] (iteration order is not guaranteed)\n */\nfunction keysIn(object) {\n  var index = -1,\n      isProto = isPrototype(object),\n      props = baseKeysIn(object),\n      propsLength = props.length,\n      indexes = indexKeys(object),\n      skipIndexes = !!indexes,\n      result = indexes || [],\n      length = result.length;\n\n  while (++index < propsLength) {\n    var key = props[index];\n    if (!(skipIndexes && (key == 'length' || isIndex(key, length))) &&\n        !(key == 'constructor' && (isProto || !hasOwnProperty.call(object, key)))) {\n      result.push(key);\n    }\n  }\n  return result;\n}\n\nexport default keysIn;\n","import assignValue from './_assignValue';\nimport copyObject from './_copyObject';\nimport createAssigner from './_createAssigner';\nimport isArrayLike from './isArrayLike';\nimport isPrototype from './_isPrototype';\nimport keysIn from './keysIn';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Built-in value references. */\nvar propertyIsEnumerable = objectProto.propertyIsEnumerable;\n\n/** Detect if properties shadowing those on `Object.prototype` are non-enumerable. */\nvar nonEnumShadows = !propertyIsEnumerable.call({ 'valueOf': 1 }, 'valueOf');\n\n/**\n * This method is like `_.assign` except that it iterates over own and\n * inherited source properties.\n *\n * **Note:** This method mutates `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias extend\n * @category Object\n * @param {Object} object The destination object.\n * @param {...Object} [sources] The source objects.\n * @returns {Object} Returns `object`.\n * @see _.assign\n * @example\n *\n * function Foo() {\n *   this.b = 2;\n * }\n *\n * function Bar() {\n *   this.d = 4;\n * }\n *\n * Foo.prototype.c = 3;\n * Bar.prototype.e = 5;\n *\n * _.assignIn({ 'a': 1 }, new Foo, new Bar);\n * // => { 'a': 1, 'b': 2, 'c': 3, 'd': 4, 'e': 5 }\n */\nvar assignIn = createAssigner(function(object, source) {\n  if (nonEnumShadows || isPrototype(source) || isArrayLike(source)) {\n    copyObject(source, keysIn(source), object);\n    return;\n  }\n  for (var key in source) {\n    assignValue(object, key, source[key]);\n  }\n});\n\nexport default assignIn;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/observablemixin\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport extend from './lib/lodash/extend';\nimport isObject from './lib/lodash/isObject';\n\nconst observablePropertiesSymbol = Symbol( 'observableProperties' );\nconst boundObservablesSymbol = Symbol( 'boundObservables' );\nconst boundPropertiesSymbol = Symbol( 'boundProperties' );\n\n/**\n * Mixin that injects the \"observable properties\" and data binding functionality described in the\n * {@link ~Observable} interface.\n *\n * @mixin ObservableMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/observablemixin~Observable\n */\nconst ObservableMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tset( name, value ) {\n\t\t// If the first parameter is an Object, iterate over its properties.\n\t\tif ( isObject( name ) ) {\n\t\t\tObject.keys( name ).forEach( property => {\n\t\t\t\tthis.set( property, name[ property ] );\n\t\t\t}, this );\n\n\t\t\treturn;\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst properties = this[ observablePropertiesSymbol ];\n\n\t\tif ( ( name in this ) && !properties.has( name ) ) {\n\t\t\t/**\n\t\t\t * Cannot override an existing property.\n\t\t\t *\n\t\t\t * This error is thrown when trying to {@link ~Observable#set set} an property with\n\t\t\t * a name of an already existing property. For example:\n\t\t\t *\n\t\t\t *\t\tlet observable = new Model();\n\t\t\t *\t\tobservable.property = 1;\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// throws\n\t\t\t *\n\t\t\t *\t\tobservable.set( 'property', 1 );\n\t\t\t *\t\tobservable.set( 'property', 2 );\t\t\t// ok, because this is an existing property.\n\t\t\t *\n\t\t\t * @error observable-set-cannot-override\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-set-cannot-override: Cannot override an existing property.' );\n\t\t}\n\n\t\tObject.defineProperty( this, name, {\n\t\t\tenumerable: true,\n\t\t\tconfigurable: true,\n\n\t\t\tget() {\n\t\t\t\treturn properties.get( name );\n\t\t\t},\n\n\t\t\tset( value ) {\n\t\t\t\tconst oldValue = properties.get( name );\n\n\t\t\t\t// Fire `set` event before the new value will be set to make it possible\n\t\t\t\t// to override observable property without affecting `change` event.\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5-utils/issues/171.\n\t\t\t\tlet newValue = this.fire( 'set:' + name, name, value, oldValue );\n\n\t\t\t\tif ( newValue === undefined ) {\n\t\t\t\t\tnewValue = value;\n\t\t\t\t}\n\n\t\t\t\t// Allow undefined as an initial value like A.define( 'x', undefined ) (#132).\n\t\t\t\t// Note: When properties map has no such own property, then its value is undefined.\n\t\t\t\tif ( oldValue !== newValue || !properties.has( name ) ) {\n\t\t\t\t\tproperties.set( name, newValue );\n\t\t\t\t\tthis.fire( 'change:' + name, name, newValue, oldValue );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\tthis[ name ] = value;\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tbind( ...bindProperties ) {\n\t\tif ( !bindProperties.length || !isStringArray( bindProperties ) ) {\n\t\t\t/**\n\t\t\t * All properties must be strings.\n\t\t\t *\n\t\t\t * @error observable-bind-wrong-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-wrong-properties: All properties must be strings.' );\n\t\t}\n\n\t\tif ( ( new Set( bindProperties ) ).size !== bindProperties.length ) {\n\t\t\t/**\n\t\t\t * Properties must be unique.\n\t\t\t *\n\t\t\t * @error observable-bind-duplicate-properties\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-duplicate-properties: Properties must be unique.' );\n\t\t}\n\n\t\tinitObservable( this );\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\n\t\tbindProperties.forEach( propertyName => {\n\t\t\tif ( boundProperties.has( propertyName ) ) {\n\t\t\t\t/**\n\t\t\t\t * Cannot bind the same property more that once.\n\t\t\t\t *\n\t\t\t\t * @error observable-bind-rebind\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-bind-rebind: Cannot bind the same property more that once.' );\n\t\t\t}\n\t\t} );\n\n\t\tconst bindings = new Map();\n\n\t\t// @typedef {Object} Binding\n\t\t// @property {Array} property Property which is bound.\n\t\t// @property {Array} to Array of observable–property components of the binding (`{ observable: ..., property: .. }`).\n\t\t// @property {Array} callback A function which processes `to` components.\n\t\tbindProperties.forEach( a => {\n\t\t\tconst binding = { property: a, to: [] };\n\n\t\t\tboundProperties.set( a, binding );\n\t\t\tbindings.set( a, binding );\n\t\t} );\n\n\t\t// @typedef {Object} BindChain\n\t\t// @property {Function} to See {@link ~ObservableMixin#_bindTo}.\n\t\t// @property {Function} toMany See {@link ~ObservableMixin#_bindToMany}.\n\t\t// @property {module:utils/observablemixin~Observable} _observable The observable which initializes the binding.\n\t\t// @property {Array} _bindProperties Array of `_observable` properties to be bound.\n\t\t// @property {Array} _to Array of `to()` observable–properties (`{ observable: toObservable, properties: ...toProperties }`).\n\t\t// @property {Map} _bindings Stores bindings to be kept in\n\t\t// {@link ~ObservableMixin#_boundProperties}/{@link ~ObservableMixin#_boundObservables}\n\t\t// initiated in this binding chain.\n\t\treturn {\n\t\t\tto: bindTo,\n\t\t\ttoMany: bindToMany,\n\n\t\t\t_observable: this,\n\t\t\t_bindProperties: bindProperties,\n\t\t\t_to: [],\n\t\t\t_bindings: bindings\n\t\t};\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tunbind( ...unbindProperties ) {\n\t\t// Nothing to do here if not inited yet.\n\t\tif ( !( observablePropertiesSymbol in this ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst boundProperties = this[ boundPropertiesSymbol ];\n\t\tconst boundObservables = this[ boundObservablesSymbol ];\n\n\t\tif ( unbindProperties.length ) {\n\t\t\tif ( !isStringArray( unbindProperties ) ) {\n\t\t\t\t/**\n\t\t\t\t * Properties must be strings.\n\t\t\t\t *\n\t\t\t\t * @error observable-unbind-wrong-properties\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'observable-unbind-wrong-properties: Properties must be strings.' );\n\t\t\t}\n\n\t\t\tunbindProperties.forEach( propertyName => {\n\t\t\t\tconst binding = boundProperties.get( propertyName );\n\n\t\t\t\t// Nothing to do if the binding is not defined\n\t\t\t\tif ( !binding ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tlet toObservable, toProperty, toProperties, toPropertyBindings;\n\n\t\t\t\tbinding.to.forEach( to => {\n\t\t\t\t\t// TODO: ES6 destructuring.\n\t\t\t\t\ttoObservable = to[ 0 ];\n\t\t\t\t\ttoProperty = to[ 1 ];\n\t\t\t\t\ttoProperties = boundObservables.get( toObservable );\n\t\t\t\t\ttoPropertyBindings = toProperties[ toProperty ];\n\n\t\t\t\t\ttoPropertyBindings.delete( binding );\n\n\t\t\t\t\tif ( !toPropertyBindings.size ) {\n\t\t\t\t\t\tdelete toProperties[ toProperty ];\n\t\t\t\t\t}\n\n\t\t\t\t\tif ( !Object.keys( toProperties ).length ) {\n\t\t\t\t\t\tboundObservables.delete( toObservable );\n\t\t\t\t\t\tthis.stopListening( toObservable, 'change' );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\tboundProperties.delete( propertyName );\n\t\t\t} );\n\t\t} else {\n\t\t\tboundObservables.forEach( ( bindings, boundObservable ) => {\n\t\t\t\tthis.stopListening( boundObservable, 'change' );\n\t\t\t} );\n\n\t\t\tboundObservables.clear();\n\t\t\tboundProperties.clear();\n\t\t}\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdecorate( methodName ) {\n\t\tconst originalMethod = this[ methodName ];\n\n\t\tif ( !originalMethod ) {\n\t\t\t/**\n\t\t\t * Cannot decorate an undefined method.\n\t\t\t *\n\t\t\t * @error observablemixin-cannot-decorate-undefined\n\t\t\t * @param {Object} object The object which method should be decorated.\n\t\t\t * @param {String} methodName Name of the method which does not exist.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'observablemixin-cannot-decorate-undefined: Cannot decorate an undefined method.',\n\t\t\t\t{ object: this, methodName }\n\t\t\t);\n\t\t}\n\n\t\tthis.on( methodName, ( evt, args ) => {\n\t\t\tevt.return = originalMethod.apply( this, args );\n\t\t} );\n\n\t\tthis[ methodName ] = function( ...args ) {\n\t\t\treturn this.fire( methodName, args );\n\t\t};\n\t}\n};\n\nextend( ObservableMixin, EmitterMixin );\n\nexport default ObservableMixin;\n\n// Init symbol properties needed to for the observable mechanism to work.\n//\n// @private\n// @param {module:utils/observablemixin~ObservableMixin} observable\nfunction initObservable( observable ) {\n\t// Do nothing if already inited.\n\tif ( observablePropertiesSymbol in observable ) {\n\t\treturn;\n\t}\n\n\t// The internal hash containing the observable's state.\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, observablePropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Map containing bindings to external observables. It shares the binding objects\n\t// (`{ observable: A, property: 'a', to: ... }`) with {@link module:utils/observablemixin~ObservableMixin#_boundProperties} and\n\t// it is used to observe external observables to update own properties accordingly.\n\t// See {@link module:utils/observablemixin~ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundObservables );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\tB: {\n\t//\t\t\t\t\tx: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\t\t\t{ observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\ty: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\t\t] ),\n\t//\t\t\t\t\tz: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t},\n\t//\t\t\t\tC: {\n\t//\t\t\t\t\tw: Set( [\n\t//\t\t\t\t\t\t{ observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t\t\t] )\n\t//\t\t\t\t}\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundObservablesSymbol, {\n\t\tvalue: new Map()\n\t} );\n\n\t// Object that stores which properties of this observable are bound and how. It shares\n\t// the binding objects (`{ observable: A, property: 'a', to: ... }`) with {@link utils.ObservableMixin#_boundObservables}.\n\t// This data structure is a reverse of {@link utils.ObservableMixin#_boundObservables} and it is helpful for\n\t// {@link utils.ObservableMixin#unbind}.\n\t//\n\t// See {@link utils.ObservableMixin#bind}.\n\t//\n\t//\t\tA.bind( 'a', 'b', 'c' ).to( B, 'x', 'y', 'x' );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] }\n\t//\t\t\t} )\n\t//\n\t//\t\tA.bind( 'd' ).to( B, 'z' ).to( C, 'w' ).as( callback );\n\t//\t\tconsole.log( A._boundProperties );\n\t//\n\t//\t\t\tMap( {\n\t//\t\t\t\ta: { observable: A, property: 'a', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\tb: { observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n\t//\t\t\t\tc: { observable: A, property: 'c', to: [ [ B, 'x' ] ] },\n\t//\t\t\t\td: { observable: A, property: 'd', to: [ [ B, 'z' ], [ C, 'w' ] ], callback: callback }\n\t//\t\t\t} )\n\t//\n\t// @private\n\t// @type {Map}\n\tObject.defineProperty( observable, boundPropertiesSymbol, {\n\t\tvalue: new Map()\n\t} );\n}\n\n// A chaining for {@link module:utils/observablemixin~ObservableMixin#bind} providing `.to()` interface.\n//\n// @private\n// @param {...[Observable|String|Function]} args Arguments of the `.to( args )` binding.\nfunction bindTo( ...args ) {\n\tconst parsedArgs = parseBindToArgs( ...args );\n\tconst bindingsKeys = Array.from( this._bindings.keys() );\n\tconst numberOfBindings = bindingsKeys.length;\n\n\t// Eliminate A.bind( 'x' ).to( B, C )\n\tif ( !parsedArgs.callback && parsedArgs.to.length > 1 ) {\n\t\t/**\n\t\t * Binding multiple observables only possible with callback.\n\t\t *\n\t\t * @error observable-bind-no-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-no-callback: Binding multiple observables only possible with callback.' );\n\t}\n\n\t// Eliminate A.bind( 'x', 'y' ).to( B, callback )\n\tif ( numberOfBindings > 1 && parsedArgs.callback ) {\n\t\t/**\n\t\t * Cannot bind multiple properties and use a callback in one binding.\n\t\t *\n\t\t * @error observable-bind-to-extra-callback\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-extra-callback: Cannot bind multiple properties and use a callback in one binding.' );\n\t}\n\n\tparsedArgs.to.forEach( to => {\n\t\t// Eliminate A.bind( 'x', 'y' ).to( B, 'a' )\n\t\tif ( to.properties.length && to.properties.length !== numberOfBindings ) {\n\t\t\t/**\n\t\t\t * The number of properties must match.\n\t\t\t *\n\t\t\t * @error observable-bind-to-properties-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'observable-bind-to-properties-length: The number of properties must match.' );\n\t\t}\n\n\t\t// When no to.properties specified, observing source properties instead i.e.\n\t\t// A.bind( 'x', 'y' ).to( B ) -> Observe B.x and B.y\n\t\tif ( !to.properties.length ) {\n\t\t\tto.properties = this._bindProperties;\n\t\t}\n\t} );\n\n\tthis._to = parsedArgs.to;\n\n\t// Fill {@link BindChain#_bindings} with callback. When the callback is set there's only one binding.\n\tif ( parsedArgs.callback ) {\n\t\tthis._bindings.get( bindingsKeys[ 0 ] ).callback = parsedArgs.callback;\n\t}\n\n\tattachBindToListeners( this._observable, this._to );\n\n\t// Update observable._boundProperties and observable._boundObservables.\n\tupdateBindToBound( this );\n\n\t// Set initial values of bound properties.\n\tthis._bindProperties.forEach( propertyName => {\n\t\tupdateBoundObservableProperty( this._observable, propertyName );\n\t} );\n}\n\n// Binds to an attribute in a set of iterable observables.\n//\n// @private\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @param {Function} callback\nfunction bindToMany( observables, attribute, callback ) {\n\tif ( this._bindings.size > 1 ) {\n\t\t/**\n\t\t * Binding one attribute to many observables only possible with one attribute.\n\t\t *\n\t\t * @error observable-bind-to-many-not-one-binding\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-many-not-one-binding: Cannot bind multiple properties with toMany().' );\n\t}\n\n\tthis.to(\n\t\t// Bind to #attribute of each observable...\n\t\t...getBindingTargets( observables, attribute ),\n\t\t// ...using given callback to parse attribute values.\n\t\tcallback\n\t);\n}\n\n// Returns an array of binding components for\n// {@link Observable#bind} from a set of iterable observables.\n//\n// @param {Array.<Observable>} observables\n// @param {String} attribute\n// @returns {Array.<String|Observable>}\nfunction getBindingTargets( observables, attribute ) {\n\tconst observableAndAttributePairs = observables.map( observable => [ observable, attribute ] );\n\n\t// Merge pairs to one-dimension array of observables and attributes.\n\treturn Array.prototype.concat.apply( [], observableAndAttributePairs );\n}\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n\n// Parses and validates {@link Observable#bind}`.to( args )` arguments and returns\n// an object with a parsed structure. For example\n//\n//\t\tA.bind( 'x' ).to( B, 'a', C, 'b', call );\n//\n// becomes\n//\n//\t\t{\n//\t\t\tto: [\n//\t\t\t\t{ observable: B, properties: [ 'a' ] },\n//\t\t\t\t{ observable: C, properties: [ 'b' ] },\n//\t\t\t],\n//\t\t\tcallback: call\n// \t\t}\n//\n// @private\n// @param {...*} args Arguments of {@link Observable#bind}`.to( args )`.\n// @returns {Object}\nfunction parseBindToArgs( ...args ) {\n\t// Eliminate A.bind( 'x' ).to()\n\tif ( !args.length ) {\n\t\t/**\n\t\t * Invalid argument syntax in `to()`.\n\t\t *\n\t\t * @error observable-bind-to-parse-error\n\t\t */\n\t\tthrow new CKEditorError( 'observable-bind-to-parse-error: Invalid argument syntax in `to()`.' );\n\t}\n\n\tconst parsed = { to: [] };\n\tlet lastObservable;\n\n\tif ( typeof args[ args.length - 1 ] == 'function' ) {\n\t\tparsed.callback = args.pop();\n\t}\n\n\targs.forEach( a => {\n\t\tif ( typeof a == 'string' ) {\n\t\t\tlastObservable.properties.push( a );\n\t\t} else if ( typeof a == 'object' ) {\n\t\t\tlastObservable = { observable: a, properties: [] };\n\t\t\tparsed.to.push( lastObservable );\n\t\t} else {\n\t\t\tthrow new CKEditorError( 'observable-bind-to-parse-error: Invalid argument syntax in `to()`.' );\n\t\t}\n\t} );\n\n\treturn parsed;\n}\n\n// Synchronizes {@link module:utils/observablemixin#_boundObservables} with {@link Binding}.\n//\n// @private\n// @param {Binding} binding A binding to store in {@link Observable#_boundObservables}.\n// @param {Observable} toObservable A observable, which is a new component of `binding`.\n// @param {String} toPropertyName A name of `toObservable`'s property, a new component of the `binding`.\nfunction updateBoundObservables( observable, binding, toObservable, toPropertyName ) {\n\tconst boundObservables = observable[ boundObservablesSymbol ];\n\tconst bindingsToObservable = boundObservables.get( toObservable );\n\tconst bindings = bindingsToObservable || {};\n\n\tif ( !bindings[ toPropertyName ] ) {\n\t\tbindings[ toPropertyName ] = new Set();\n\t}\n\n\t// Pass the binding to a corresponding Set in `observable._boundObservables`.\n\tbindings[ toPropertyName ].add( binding );\n\n\tif ( !bindingsToObservable ) {\n\t\tboundObservables.set( toObservable, bindings );\n\t}\n}\n\n// Synchronizes {@link Observable#_boundProperties} and {@link Observable#_boundObservables}\n// with {@link BindChain}.\n//\n// Assuming the following binding being created\n//\n// \t\tA.bind( 'a', 'b' ).to( B, 'x', 'y' );\n//\n// the following bindings were initialized by {@link Observable#bind} in {@link BindChain#_bindings}:\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [] },\n// \t\t\tb: { observable: A, property: 'b', to: [] },\n// \t\t}\n//\n// Iterate over all bindings in this chain and fill their `to` properties with\n// corresponding to( ... ) arguments (components of the binding), so\n//\n// \t\t{\n// \t\t\ta: { observable: A, property: 'a', to: [ B, 'x' ] },\n// \t\t\tb: { observable: A, property: 'b', to: [ B, 'y' ] },\n// \t\t}\n//\n// Then update the structure of {@link Observable#_boundObservables} with updated\n// binding, so it becomes:\n//\n// \t\tMap( {\n// \t\t\tB: {\n// \t\t\t\tx: Set( [\n// \t\t\t\t\t{ observable: A, property: 'a', to: [ [ B, 'x' ] ] }\n// \t\t\t\t] ),\n// \t\t\t\ty: Set( [\n// \t\t\t\t\t{ observable: A, property: 'b', to: [ [ B, 'y' ] ] },\n// \t\t\t\t] )\n//\t\t\t}\n// \t\t} )\n//\n// @private\n// @param {BindChain} chain The binding initialized by {@link Observable#bind}.\nfunction updateBindToBound( chain ) {\n\tlet toProperty;\n\n\tchain._bindings.forEach( ( binding, propertyName ) => {\n\t\t// Note: For a binding without a callback, this will run only once\n\t\t// like in A.bind( 'x', 'y' ).to( B, 'a', 'b' )\n\t\t// TODO: ES6 destructuring.\n\t\tchain._to.forEach( to => {\n\t\t\ttoProperty = to.properties[ binding.callback ? 0 : chain._bindProperties.indexOf( propertyName ) ];\n\n\t\t\tbinding.to.push( [ to.observable, toProperty ] );\n\t\t\tupdateBoundObservables( chain._observable, binding, to.observable, toProperty );\n\t\t} );\n\t} );\n}\n\n// Updates an property of a {@link Observable} with a value\n// determined by an entry in {@link Observable#_boundProperties}.\n//\n// @private\n// @param {Observable} observable A observable which property is to be updated.\n// @param {String} propertyName An property to be updated.\nfunction updateBoundObservableProperty( observable, propertyName ) {\n\tconst boundProperties = observable[ boundPropertiesSymbol ];\n\tconst binding = boundProperties.get( propertyName );\n\tlet propertyValue;\n\n\t// When a binding with callback is created like\n\t//\n\t// \t\tA.bind( 'a' ).to( B, 'b', C, 'c', callback );\n\t//\n\t// collect B.b and C.c, then pass them to callback to set A.a.\n\tif ( binding.callback ) {\n\t\tpropertyValue = binding.callback.apply( observable, binding.to.map( to => to[ 0 ][ to[ 1 ] ] ) );\n\t} else {\n\t\tpropertyValue = binding.to[ 0 ];\n\t\tpropertyValue = propertyValue[ 0 ][ propertyValue[ 1 ] ];\n\t}\n\n\tif ( observable.hasOwnProperty( propertyName ) ) {\n\t\tobservable[ propertyName ] = propertyValue;\n\t} else {\n\t\tobservable.set( propertyName, propertyValue );\n\t}\n}\n\n// Starts listening to changes in {@link BindChain._to} observables to update\n// {@link BindChain._observable} {@link BindChain._bindProperties}. Also sets the\n// initial state of {@link BindChain._observable}.\n//\n// @private\n// @param {BindChain} chain The chain initialized by {@link Observable#bind}.\nfunction attachBindToListeners( observable, toBindings ) {\n\ttoBindings.forEach( to => {\n\t\tconst boundObservables = observable[ boundObservablesSymbol ];\n\t\tlet bindings;\n\n\t\t// If there's already a chain between the observables (`observable` listens to\n\t\t// `to.observable`), there's no need to create another `change` event listener.\n\t\tif ( !boundObservables.get( to.observable ) ) {\n\t\t\tobservable.listenTo( to.observable, 'change', ( evt, propertyName ) => {\n\t\t\t\tbindings = boundObservables.get( to.observable )[ propertyName ];\n\n\t\t\t\t// Note: to.observable will fire for any property change, react\n\t\t\t\t// to changes of properties which are bound only.\n\t\t\t\tif ( bindings ) {\n\t\t\t\t\tbindings.forEach( binding => {\n\t\t\t\t\t\tupdateBoundObservableProperty( observable, binding.property );\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t} );\n}\n\n/**\n * Interface which adds \"observable properties\" and data binding functionality.\n *\n * Can be easily implemented by a class by mixing the {@link module:utils/observablemixin~ObservableMixin} mixin.\n *\n * @interface Observable\n * @extends module:utils/emittermixin~Emitter\n */\n\n/**\n * Fired when a property changed value.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `${ propertyName } has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'prop has changed from 1 to 2'\n *\n * @event change:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Fired when a property value is going to be set but is not set yet (before the `change` event is fired).\n *\n * You can control the final value of the property by using\n * the {@link module:utils/eventinfo~EventInfo#return event's `return` property}.\n *\n *\t\tobservable.set( 'prop', 1 );\n *\n *\t\tobservable.on( 'set:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value is going to be changed from ${ oldValue } to ${ newValue }` );\n *\t\t\tconsole.log( `Current property value is ${ observable[ propertyName ] }` );\n *\n *\t\t\t// Let's override the value.\n *\t\t\tevt.return = 3;\n *\t\t} );\n *\n *\t\tobservable.on( 'change:prop', ( evt, propertyName, newValue, oldValue ) => {\n *\t\t\tconsole.log( `Value has changed from ${ oldValue } to ${ newValue }` );\n *\t\t} );\n *\n *\t\tobservable.prop = 2; // -> 'Value is going to be changed from 1 to 2'\n *\t\t                     // -> 'Current property value is 1'\n *\t\t                     // -> 'Value has changed from 1 to 3'\n *\n * **Note:** Event is fired even when the new value is the same as the old value.\n *\n * @event set:{property}\n * @param {String} name The property name.\n * @param {*} value The new property value.\n * @param {*} oldValue The previous property value.\n */\n\n/**\n * Creates and sets the value of an observable property of this object. Such an property becomes a part\n * of the state and is be observable.\n *\n * It accepts also a single object literal containing key/value pairs with properties to be set.\n *\n * This method throws the `observable-set-cannot-override` error if the observable instance already\n * have a property with the given property name. This prevents from mistakenly overriding existing\n * properties and methods, but means that `foo.set( 'bar', 1 )` may be slightly slower than `foo.bar = 1`.\n *\n * @method #set\n * @param {String|Object} name The property's name or object with `name=>value` pairs.\n * @param {*} [value] The property's value (if `name` was passed in the first parameter).\n */\n\n/**\n * Binds observable properties to another objects implementing {@link module:utils/observablemixin~Observable}\n * interface (like {@link module:ui/model~Model}).\n *\n * Once bound, the observable will immediately share the current state of properties\n * of the observable it is bound to and react to the changes to these properties\n * in the future.\n *\n * **Note**: To release the binding use {@link module:utils/observablemixin~Observable#unbind}.\n *\n * Using `bind().to()` chain:\n *\n *\t\tA.bind( 'a' ).to( B );\n *\t\tA.bind( 'a' ).to( B, 'b' );\n *\t\tA.bind( 'a', 'b' ).to( B, 'c', 'd' );\n *\t\tA.bind( 'a' ).to( B, 'b', C, 'd', ( b, d ) => b + d );\n *\n * It is also possible to bind to the same property in a observables collection using `bind().toMany()` chain:\n *\n *\t\tA.bind( 'a' ).toMany( [ B, C, D ], 'x', ( a, b, c ) => a + b + c );\n *\t\tA.bind( 'a' ).toMany( [ B, C, D ], 'x', ( ...x ) => x.every( x => x ) );\n *\n * @method #bind\n * @param {...String} bindProperties Observable properties that will be bound to another observable(s).\n * @returns {Object} The bind chain with the `to()` and `toMany()` methods.\n */\n\n/**\n * Removes the binding created with {@link #bind}.\n *\n *\t\tA.unbind( 'a' );\n *\t\tA.unbind();\n *\n * @method #unbind\n * @param {...String} [unbindProperties] Observable properties to be unbound. All the bindings will\n * be released if no properties provided.\n */\n\n/**\n * Turns the given methods of this object into event-based ones. This means that the new method will fire an event\n * (named after the method) and the original action will be plugged as a listener to that event.\n *\n * This is a very simplified method decoration. Itself it doesn't change the behavior of a method (expect adding the event),\n * but it allows to modify it later on by listening to the method's event.\n *\n * For example, in order to cancel the method execution one can stop the event:\n *\n *\t\tclass Foo {\n *\t\t\tconstructor() {\n *\t\t\t\tthis.decorate( 'method' );\n *\t\t\t}\n *\n *\t\t\tmethod() {\n *\t\t\t\tconsole.log( 'called!' );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst foo = new Foo();\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.stop();\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method(); // Nothing is logged.\n *\n *\n * Note: we used a high priority listener here to execute this callback before the one which\n * calls the original method (which used the default priority).\n *\n * It's also possible to change the return value:\n *\n *\t\tfoo.on( 'method', ( evt ) => {\n *\t\t\tevt.return = 'Foo!';\n *\t\t} );\n *\n *\t\tfoo.method(); // -> 'Foo'\n *\n * Finally, it's possible to access and modify the parameters:\n *\n *\t\tmethod( a, b ) {\n *\t\t\tconsole.log( `${ a }, ${ b }`  );\n *\t\t}\n *\n *\t\t// ...\n *\n *\t\tfoo.on( 'method', ( evt, args ) => {\n *\t\t\targs[ 0 ] = 3;\n *\n *\t\t\tconsole.log( args[ 1 ] ); // -> 2\n *\t\t}, { priority: 'high' } );\n *\n *\t\tfoo.method( 1, 2 ); // -> '3, 2'\n *\n * @method #decorate\n * @param {String} methodName Name of the method to decorate.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/editableelement\n */\n\nimport ContainerElement from './containerelement';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\nconst documentSymbol = Symbol( 'document' );\n\n/**\n * Editable element which can be a {@link module:engine/view/rooteditableelement~RootEditableElement root}\n * or nested editable area in the editor.\n *\n * Editable is automatically read-only when its {module:engine/view/document~Document Document} is read-only.\n *\n * @extends module:engine/view/containerelement~ContainerElement\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditableElement extends ContainerElement {\n\t/**\n\t * Creates an editable element.\n\t *\n\t * @see module:engine/view/writer~Writer#createEditableElement\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Whether the editable is in read-write or read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * Whether the editable is focused.\n\t\t *\n\t\t * This property updates when {@link module:engine/view/document~Document#isFocused document.isFocused} or view\n\t\t * selection is changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The {@link module:engine/view/document~Document} which is an owner of this root.\n\t\t * Can only by set once.\n\t\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-editableelement-document-already-set`\n\t\t * when document is already set.\n\t\t *\n\t\t * @member {module:engine/view/document~Document} #document\n\t\t */\n\t}\n\n\t/**\n\t * Returns document associated with the editable.\n\t *\n\t * @readonly\n\t * @returns {module:engine/view/document~Document}\n\t */\n\tget document() {\n\t\treturn this.getCustomProperty( documentSymbol );\n\t}\n\n\t/**\n\t * Sets document of this editable element.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document\n\t */\n\tset _document( document ) {\n\t\tif ( this.getCustomProperty( documentSymbol ) ) {\n\t\t\t/**\n\t\t\t * View document is already set. It can only be set once.\n\t\t\t *\n\t\t\t * @error view-editableelement-document-already-set\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-editableelement-document-already-set: View document is already set.' );\n\t\t}\n\n\t\tthis._setCustomProperty( documentSymbol, document );\n\n\t\tthis.bind( 'isReadOnly' ).to( document );\n\n\t\tthis.bind( 'isFocused' ).to(\n\t\t\tdocument,\n\t\t\t'isFocused',\n\t\t\tisFocused => isFocused && document.selection.editableElement == this\n\t\t);\n\n\t\t// Update focus state based on selection changes.\n\t\tthis.listenTo( document.selection, 'change', () => {\n\t\t\tthis.isFocused = document.isFocused && document.selection.editableElement == this;\n\t\t} );\n\t}\n}\n\nmix( EditableElement, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/rooteditableelement\n */\n\nimport EditableElement from './editableelement';\n\nconst rootNameSymbol = Symbol( 'rootName' );\n\n/**\n * Class representing a single root in the data view. A root can be either {@link ~RootEditableElement#isReadOnly editable or read-only},\n * but in both cases it is called \"an editable\". Roots can contain other {@link module:engine/view/editableelement~EditableElement\n * editable elements} making them \"nested editables\".\n *\n * @extends module:engine/view/editableelement~EditableElement\n */\nexport default class RootEditableElement extends EditableElement {\n\t/**\n\t * Creates root editable element.\n\t *\n\t * @param {String} name Node name.\n\t */\n\tconstructor( name ) {\n\t\tsuper( name );\n\n\t\t/**\n\t\t * Name of this root inside {@link module:engine/view/document~Document} that is an owner of this root. If no\n\t\t * other name is set, `main` name is used.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.rootName = 'main';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'rootElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'rootElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\tget rootName() {\n\t\treturn this.getCustomProperty( rootNameSymbol );\n\t}\n\n\tset rootName( rootName ) {\n\t\tthis._setCustomProperty( rootNameSymbol, rootName );\n\t}\n\n\t/**\n\t * Overrides old element name and sets new one.\n\t * This is needed because view roots are created before they are attached to the DOM.\n\t * The name of the root element is temporary at this stage. It has to be changed when the\n\t * view root element is attached to the DOM element.\n\t *\n\t * @protected\n\t * @param {String} name The new name of element.\n\t */\n\tset _name( name ) {\n\t\tthis.name = name;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/treewalker\n */\n\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Position from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} options Object with configuration.\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/view/position~Position} [options.startPosition] Starting position.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all characters from\n\t * {@link module:engine/view/text~Text} should be returned as one {@link module:engine/view/text~Text} (`false`) ore one by one as\n\t * {@link module:engine/view/textproxy~TextProxy} (`true`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/view/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position have been defined.\n\t\t\t *\n\t\t\t * @error view-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.' );\n\t\t}\n\n\t\tif ( options.direction && options.direction != 'forward' && options.direction != 'backward' ) {\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.',\n\t\t\t\t{ direction: options.direction }\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/range~Range} module:engine/view/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. If start position is not defined then position depends on {@link #direction}. If direction is\n\t\t * `'forward'` position starts form the beginning, when direction is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position} module:engine/view/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = Position.createFromPosition( options.startPosition );\n\t\t} else {\n\t\t\tthis.position = Position.createFromPosition( options.boundaries[ options.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/view/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = options.direction || 'forward';\n\n\t\t/**\n\t\t * Flag indicating whether all characters from {@link module:engine/view/text~Text} should be returned as one\n\t\t * {@link module:engine/view/text~Text} or one by one as {@link module:engine/view/textproxy~TextProxy}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If set to `true`, walker will not\n\t\t * return a parent node of the start position. Each {@link module:engine/view/element~Element} will be returned once.\n\t\t * When set to `false` each element might be returned twice: for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\twalker.skip( value => true ); // Move the position to the end: <p>{}foo</p> -> <p>foo</p>[]\n\t * \t\twalker.skip( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} Object implementing iterator interface, returning\n\t * information about taken step.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in view. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done `true` if iterator is done, `false` otherwise.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tlet position = Position.createFromPosition( this.position );\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.childCount ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just after current position.\n\t\tlet node;\n\n\t\t// Text is a specific parent because it contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtEnd ) {\n\t\t\t\t// Prevent returning \"elementEnd\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position.createAfter( parent );\n\n\t\t\t\treturn this._next();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryEndParent ) {\n\t\t\t\t\tcharactersCount = this.boundaries.end.offset;\n\t\t\t\t\titem = new TextProxy( node, 0, charactersCount );\n\t\t\t\t\tposition = Position.createAfter( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving forward.\n\t\t\t\t\tposition.offset++;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\ttextLength = 1;\n\t\t\t} else {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst endOffset = parent === this._boundaryEndParent ? this.boundaries.end.offset : parent.data.length;\n\n\t\t\t\ttextLength = endOffset - position.offset;\n\t\t\t}\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tposition.offset += textLength;\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition = Position.createAfter( parent );\n\t\t\tthis.position = position;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn this._formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in view. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tlet position = Position.createFromPosition( this.position );\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before current position.\n\t\tlet node;\n\n\t\t// Text {@link module:engine/view/text~Text} element is a specific parent because contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtStart ) {\n\t\t\t\t// Prevent returning \"elementStart\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position.createBefore( parent );\n\n\t\t\t\treturn this._previous();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset - 1 ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset - 1 );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, node.childCount );\n\t\t\t\tthis.position = position;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn this._formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tposition.offset--;\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, node.data.length );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._previous();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryStartParent ) {\n\t\t\t\t\tconst offset = this.boundaries.start.offset;\n\n\t\t\t\t\titem = new TextProxy( node, offset, node.data.length - offset );\n\t\t\t\t\tcharactersCount = item.data.length;\n\t\t\t\t\tposition = Position.createBefore( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving backward.\n\t\t\t\t\tposition.offset--;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( !this.singleCharacters ) {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst startOffset = parent === this._boundaryStartParent ? this.boundaries.start.offset : 0;\n\n\t\t\t\ttextLength = position.offset - startOffset;\n\t\t\t} else {\n\t\t\t\ttextLength = 1;\n\t\t\t}\n\n\t\t\tposition.offset -= textLength;\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition = Position.createBefore( parent );\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n\n\t/**\n\t * Format returned data and adjust `previousPosition` and `nextPosition` if reach the bound of the {@link module:engine/view/text~Text}.\n\t *\n\t * @private\n\t * @param {module:engine/view/treewalker~TreeWalkerValueType} type Type of step.\n\t * @param {module:engine/view/item~Item} item Item between old and new position.\n\t * @param {module:engine/view/position~Position} previousPosition Previous position of iterator.\n\t * @param {module:engine/view/position~Position} nextPosition Next position of iterator.\n\t * @param {Number} [length] Length of the item.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue}\n\t */\n\t_formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\t\t// Text is a specific parent, because contains string instead of children.\n\t\t// Walker doesn't enter to the Text except situations when walker is iterating over every single character,\n\t\t// or the bound starts/ends inside the Text. So when the position is at the beginning or at the end of the Text\n\t\t// we move it just before or just after Text.\n\t\tif ( item instanceof TextProxy ) {\n\t\t\t// Position is at the end of Text.\n\t\t\tif ( item.offsetInText + item.data.length == item.textNode.data.length ) {\n\t\t\t\tif ( this.direction == 'forward' && !( this.boundaries && this.boundaries.end.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position.createAfter( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position.createAfter( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Position is at the begining ot the text.\n\t\t\tif ( item.offsetInText === 0 ) {\n\t\t\t\tif ( this.direction == 'backward' && !( this.boundaries && this.boundaries.start.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position.createBefore( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position.createBefore( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tdone: false,\n\t\t\tvalue: {\n\t\t\t\ttype,\n\t\t\t\titem,\n\t\t\t\tpreviousPosition,\n\t\t\t\tnextPosition,\n\t\t\t\tlength\n\t\t\t}\n\t\t};\n\t}\n}\n\n/**\n * Type of the step made by {@link module:engine/view/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end\n * of node, or `'text'` if walker traversed over single and multiple characters.\n * For {@link module:engine/view/text~Text} `elementStart` and `elementEnd` is not returned.\n *\n * @typedef {String} module:engine/view/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/view/treewalker~TreeWalker} when traversing tree view.\n *\n * @typedef {Object} module:engine/view/treewalker~TreeWalkerValue\n * @property {module:engine/view/treewalker~TreeWalkerValueType} type\n * @property {module:engine/view/item~Item} item Item between old and new positions of {@link module:engine/view/treewalker~TreeWalker}.\n * @property {module:engine/view/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item. Note that it is more efficient to use this position then calculate the position before\n * the node using {@link module:engine/view/position~Position.createBefore}.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the Text to its parent just before or just after Text.\n * @property {module:engine/view/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the Text to its parent just before or just after Text.\n * @property {Number} [length] Length of the item. For `'elementStart'` it is 1. For `'text'` it is\n * the length of the text. For `'elementEnd'` it is undefined.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/view/treewalker~TreeWalkerDirection\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/position\n */\n\nimport TreeWalker from './treewalker';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EditableElement from './editableelement';\n\n/**\n * Position in the tree. Position is always located before or after a node.\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} parent Position parent.\n\t * @param {Number} offset Position offset.\n\t */\n\tconstructor( parent, offset ) {\n\t\t/**\n\t\t * Position parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t\t * module:engine/view/position~Position#parent\n\t\t */\n\t\tthis.parent = parent;\n\n\t\t/**\n\t\t * Position offset.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/position~Position#offset\n\t\t */\n\t\tthis.offset = offset;\n\t}\n\n\t/**\n\t * Node directly after the position. Equals `null` when there is no node after position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset ) || null;\n\t}\n\n\t/**\n\t * Node directly before the position. Equals `null` when there is no node before position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeBefore() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset - 1 ) || null;\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\tconst endOffset = this.parent.is( 'text' ) ? this.parent.data.length : this.parent.childCount;\n\n\t\treturn this.offset === endOffset;\n\t}\n\n\t/**\n\t * Position's root, that is the root of the position's parent element.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.parent.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this position, or `null` if\n\t * position is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tlet editable = this.parent;\n\n\t\twhile ( !( editable instanceof EditableElement ) ) {\n\t\t\tif ( editable.parent ) {\n\t\t\t\teditable = editable.parent;\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t}\n\n\t\treturn editable;\n\t}\n\n\t/**\n\t * Returns a new instance of Position with offset incremented by `shift` value.\n\t *\n\t * @param {Number} shift How position offset should get changed. Accepts negative values.\n\t * @returns {module:engine/view/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = Position.createFromPosition( this );\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/view/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } ); // <p>foo[]</p> -> <p>{}foo</p>\n\t * \t\tgetLastMatchingPosition( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/view/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and it's ancestors.\n\t *\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tif ( this.parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ this.parent ];\n\t\t} else {\n\t\t\treturn this.parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions.\n\t *\n\t * @param {module:engine/view/position~Position} position\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Checks whether this position equals given position.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn ( this.parent == otherPosition.parent && this.offset == otherPosition.offset );\n\t}\n\n\t/**\n\t * Checks whether this position is located before given position. When method returns `false` it does not mean that\n\t * this position is after give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isAfter\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is located after given position. When method returns `false` it does not mean that\n\t * this position is before give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isBefore\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before, after or in same position that other position. Two positions may be also\n\t * different when they are located in separate roots.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/view/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root !== otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tif ( this.isEqual( otherPosition ) ) {\n\t\t\treturn 'same';\n\t\t}\n\n\t\t// Get path from root to position's parent element.\n\t\tconst thisPath = this.parent.is( 'node' ) ? this.parent.getPath() : [];\n\t\tconst otherPath = otherPosition.parent.is( 'node' ) ? otherPosition.parent.getPath() : [];\n\n\t\t// Add the positions' offsets to the parents offsets.\n\t\tthisPath.push( this.offset );\n\t\totherPath.push( otherPosition.offset );\n\n\t\t// Compare both path arrays to find common ancestor.\n\t\tconst result = compareArrays( thisPath, otherPath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < otherPath[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link module:engine/view/position~Position.createBefore},\n\t * * {@link module:engine/view/position~Position.createAfter},\n\t * * {@link module:engine/view/position~Position.createFromPosition}.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic createAt( itemOrPosition, offset ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn this.createFromPosition( itemOrPosition );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.is( 'text' ) ? node.data.length : node.childCount;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this.createBefore( node );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this.createAfter( node );\n\t\t\t} else if ( !offset ) {\n\t\t\t\toffset = 0;\n\t\t\t}\n\n\t\t\treturn new Position( node, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createAfter( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText + item.data.length );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root.\n\t\t\t *\n\t\t\t * @error view-position-after-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-after-root: You can not make position after root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index + 1 );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createBefore( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You cannot make a position before a root.\n\t\t\t *\n\t\t\t * @error view-position-before-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-before-root: You can not make position before root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index );\n\t}\n\n\t/**\n\t * Creates and returns a new instance of `Position`, which is equal to the passed position.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to be cloned.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createFromPosition( position ) {\n\t\treturn new this( position.parent, position.offset );\n\t}\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/view/position~PositionRelation\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\n\n/**\n * Tree view range.\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** Constructor creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.start = Position.createFromPosition( start );\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.end = end ? Position.createFromPosition( end ) : Position.createFromPosition( start );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/view/position~Position positions},\n\t * grouped as {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * This iterator uses {@link module:engine/view/treewalker~TreeWalker TreeWalker} with `boundaries` set to this range and\n\t * `ignoreElementEnd` option\n\t * set to `true`.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is it start and end positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link module:engine/view/range~Range#start start} position and\n\t * {@link module:engine/view/range~Range#end end} position are in the same {@link module:engine/view/position~Position#parent parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\treturn this.start.parent === this.end.parent;\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Creates a maximal range that has the same content as this range but is expanded in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t * \t\t<p>Foo</p><p><b>{Bar}</b></p> -> <p>Foo</p>[<p><b>Bar</b>]</p>\n\t * \t\t<p><b>foo</b>{bar}<span></span></p> -> <p><b>foo[</b>bar<span></span>]</p>\n\t *\n\t * Note that in the sample above:\n\t *  - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t *  - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t *  - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Enlarged range.\n\t */\n\tgetEnlarged() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\t// Fix positions, in case if they are in Text node.\n\t\tif ( start.parent.is( 'text' ) && start.isAtStart ) {\n\t\t\tstart = Position.createBefore( start.parent );\n\t\t}\n\n\t\tif ( end.parent.is( 'text' ) && end.isAtEnd ) {\n\t\t\tend = Position.createAfter( end.parent );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a minimum range that has the same content as this range but is trimmed in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t * \t\t<p>Foo</p>[<p><b>Bar</b>]</p> -> <p>Foo</p><p><b>{Bar}</b></p>\n\t * \t\t<p><b>foo[</b>bar<span></span>]</p> -> <p><b>foo</b>{bar}<span></span></p>\n\t *\n\t * Note that in the sample above:\n\t *  - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t *  - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t *  - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Shrink range.\n\t */\n\tgetTrimmed() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\tif ( start.isAfter( this.end ) || start.isEqual( this.end ) ) {\n\t\t\treturn new Range( start, start );\n\t\t}\n\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tconst nodeAfterStart = start.nodeAfter;\n\t\tconst nodeBeforeEnd = end.nodeBefore;\n\n\t\t// Because TreeWalker prefers positions next to text node, we need to move them manually into these text nodes.\n\t\tif ( nodeAfterStart && nodeAfterStart.is( 'text' ) ) {\n\t\t\tstart = new Position( nodeAfterStart, 0 );\n\t\t}\n\n\t\tif ( nodeBeforeEnd && nodeBeforeEnd.is( 'text' ) ) {\n\t\t\tend = new Position( nodeBeforeEnd, nodeBeforeEnd.data.length );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Two ranges are equal if their start and end positions are equal.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this == otherRange || ( this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end ) );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/position~Position position}.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/position~Position position} is contained in this range,\n\t * `false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/range~Range range}.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/range~Range range} boundaries are contained by this range, `false`\n\t * otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link module:engine/view/range~Range range} is not a part of given\n\t * {@link module:engine/view/range~Range range}.\n\t * Returned array contains zero, one or two {@link module:engine/view/range~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = new Text( 'foo' );\n\t *\t\tlet img = new ContainerElement( 'img' );\n\t *\t\tlet bar = new Text( 'bar' );\n\t *\t\tlet p = new ContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = new Range( new Position( foo, 2 ), new Position( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = new Range( new Position( foo, 1 ), new Position( bar, 2 ); \"oo\", img, \"ba\" are in range.\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = new Range( new Position( foo, 1 ), new Position( p, 2 ); // \"oo\", img are in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from ( p, 2 ) to ( bar, 1 )\n\t *\n\t *\t\totherRange = new Range( new Position( p, 1 ), new Position( p, 2 ) ); // img is in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from ( foo, 1 ) to ( p, 1 ) and from ( p, 2 ) to ( bar, 1 )\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.<module:engine/view/range~Range>} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( Range.createFromRange( this ) );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link module:engine/view/range~Range range} and given {@link module:engine/view/range~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = new Text( 'foo' );\n\t *\t\tlet img = new ContainerElement( 'img' );\n\t *\t\tlet bar = new Text( 'bar' );\n\t *\t\tlet p = new ContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = new Range( new Position( foo, 2 ), new Position( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = new Range( new Position( foo, 1 ), new Position( p, 2 ); // \"oo\", img are in range.\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // range from ( foo, 1 ) to ( p, 2 ).\n\t *\n\t *\t\totherRange = new Range( new Position( bar, 1 ), new Position( bar, 3 ); \"ar\" is in range.\n\t *\t\ttransformed = range.getIntersection( otherRange ); // null - no common part.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/view/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @param {module:engine/view/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/view/item~Item items},\n\t * not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/item~Item>}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/view/position~Position positions}, not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/position~Position>}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with given range.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} True if ranges intersect.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Creates a range from given parents and offsets.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} startElement Start position\n\t * parent element.\n\t * @param {Number} startOffset Start position offset.\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} endElement End position\n\t * parent element.\n\t * @param {Number} endOffset End position offset.\n\t * @returns {module:engine/view/range~Range} Created range.\n\t */\n\tstatic createFromParentsAndOffsets( startElement, startOffset, endElement, endOffset ) {\n\t\treturn new this(\n\t\t\tnew Position( startElement, startOffset ),\n\t\t\tnew Position( endElement, endOffset )\n\t\t);\n\t}\n\n\t/**\n\t * Creates and returns a new instance of Range which is equal to passed range.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to clone.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createFromRange( range ) {\n\t\treturn new this( range.start, range.end );\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/view/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @param {module:engine/view/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createIn( element ) {\n\t\treturn this.createFromParentsAndOffsets( element, 0, element, element.childCount );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createOn( item ) {\n\t\tconst size = item.is( 'textProxy' ) ? item.offsetSize : 1;\n\n\t\treturn this.createFromPositionAndShift( Position.createBefore( item ), size );\n\t}\n\n\t/**\n\t * Creates a collapsed range at given {@link module:engine/view/position~Position position}\n\t * or on the given {@link module:engine/view/item~Item item}.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic createCollapsedAt( itemOrPosition, offset ) {\n\t\tconst start = Position.createAt( itemOrPosition, offset );\n\t\tconst end = Position.createFromPosition( start );\n\n\t\treturn new Range( start, end );\n\t}\n}\n\n// Function used by getEnlarged and getTrimmed methods.\nfunction enlargeTrimSkip( value ) {\n\tif ( value.item.is( 'attributeElement' ) || value.item.is( 'uiElement' ) ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/count\n */\n\n/**\n * Returns the number of items return by the iterator.\n *\n *\t\tcount( [ 1, 2, 3, 4, 5 ] ); // 5;\n *\n * @param {Iterable.<*>} iterator Any iterator.\n * @returns {Number} Number of items returned by that iterator.\n */\nexport default function count( iterator ) {\n\tlet count = 0;\n\n\tfor ( const _ of iterator ) { // eslint-disable-line no-unused-vars\n\t\tcount++;\n\t}\n\n\treturn count;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/selection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Range from './range';\nimport Position from './position';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport Node from './node';\nimport Element from './element';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport DocumentSelection from './documentselection';\n\n/**\n * Class representing selection in tree view.\n *\n * Selection can consist of {@link module:engine/view/range~Range ranges} that can be set using\n * {@link module:engine/view/selection~Selection#setTo setTo} method.\n * That method create copies of provided ranges and store those copies internally. Further modifications to passed\n * ranges will not change selection's state.\n * Selection's ranges can be obtained via {@link module:engine/view/selection~Selection#getRanges getRanges},\n * {@link module:engine/view/selection~Selection#getFirstRange getFirstRange} and\n * {@link module:engine/view/selection~Selection#getLastRange getLastRange} methods, which return copies of ranges\n * stored inside selection. Modifications made on these copies will not change selection's state. Similar situation\n * occurs when getting {@link module:engine/view/selection~Selection#anchor anchor},\n * {@link module:engine/view/selection~Selection#focus focus}, {@link module:engine/view/selection~Selection#getFirstPosition first}\n * and {@link module:engine/view/selection~Selection#getLastPosition last} positions - all will return\n * copies of requested positions.\n */\nexport default class Selection {\n\t/**\n\t * Creates new selection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new Selection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tconst selection = new Selection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tconst selection = new Selection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tconst selection = new Selection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = new Selection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tconst selection = new Selection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new Selection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new Selection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new Selection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new Selection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new Selection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Stores all ranges that are selected.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/range~Range>}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Specifies whether selection instance is fake.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isFake = false;\n\n\t\t/**\n\t\t * Fake selection's label.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._fakeSelectionLabel = '';\n\n\t\tthis.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst anchor = this._lastRangeBackward ? range.end : range.start;\n\n\t\treturn Position.createFromPosition( anchor );\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst focus = this._lastRangeBackward ? range.start : range.end;\n\n\t\treturn Position.createFromPosition( focus );\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.rangeCount === 1 && this._ranges[ 0 ].isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tif ( this.anchor ) {\n\t\t\treturn this.anchor.editableElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield Range.createFromRange( range );\n\t\t}\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? Range.createFromRange( first ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? Range.createFromRange( last ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst firstRange = this.getFirstRange();\n\n\t\treturn firstRange ? Position.createFromPosition( firstRange.start ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? Position.createFromPosition( lastRange.end ) : null;\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.isFake != otherSelection.isFake ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isFake && this.fakeSelectionLabel != otherSelection.fakeSelectionLabel ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\tif ( this.isBackward != otherSelection.isBackward ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst numOfRangesA = count( this.getRanges() );\n\t\tconst numOfRangesB = count( otherSelection.getRanges() );\n\n\t\t// If selections have different number of ranges, they cannot be similar.\n\t\tif ( numOfRangesA != numOfRangesB ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If both selections have no ranges, they are similar.\n\t\tif ( numOfRangesA == 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check if each range in one selection has a similar range in other selection.\n\t\tfor ( let rangeA of this.getRanges() ) {\n\t\t\trangeA = rangeA.getTrimmed();\n\n\t\t\tlet found = false;\n\n\t\t\tfor ( let rangeB of otherSelection.getRanges() ) {\n\t\t\t\trangeB = rangeB.getTrimmed();\n\n\t\t\t\tif ( rangeA.start.isEqual( rangeB.start ) && rangeA.end.isEqual( rangeB.end ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// For `rangeA`, neither range in `otherSelection` was similar. So selections are not similar.\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// There were no ranges that weren't matched. Selections are similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = this.getFirstRange();\n\t\tconst nodeAfterStart = range.start.nodeAfter;\n\t\tconst nodeBeforeEnd = range.end.nodeBefore;\n\n\t\treturn ( nodeAfterStart instanceof Element && nodeAfterStart == nodeBeforeEnd ) ? nodeAfterStart : null;\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t *\t \t// Sets selection to contents of DocumentSelection.\n\t *\t\tselection.setTo( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t * `Selection#setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tselection.setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tselection.setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t\tthis._setFakeOptions( { fake: selectable.isFake, label: selectable.fakeSelectionLabel } );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset === undefined ) {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-setTo-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-setTo-required-second-parameter: ' +\n\t\t\t\t\t'selection.setTo requires the second parameter when the first parameter is a node.'\n\t\t\t\t);\n\t\t\t} else if ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range.createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range.createOn( selectable );\n\t\t\t} else {\n\t\t\t\trange = Range.createCollapsedAt( selectable, placeOrOffset );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t\tthis._setFakeOptions( options );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\t// Array.from() is used to prevent setting ranges to the old iterable\n\t\t\tthis._setRanges( selectable, placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set selection to given place.\n\t\t\t *\n\t\t\t * @error view-selection-setTo-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-selection-setTo-not-selectable: Cannot set selection to given place.' );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/position~Position.createAt} parameters.\n\t *\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error view-selection-setFocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.'\n\t\t\t);\n\t\t}\n\n\t\tconst newFocus = Position.createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tthis._ranges.pop();\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._addRange( new Range( newFocus, anchor ), true );\n\t\t} else {\n\t\t\tthis._addRange( new Range( anchor, newFocus ) );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link #anchor anchor} and {@link #focus focus}.\n\t * Accepts a flag describing in which way the selection is made.\n\t *\n\t * @private\n\t * @param {Iterable.<module:engine/view/range~Range>} newRanges Iterable object of ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end\n\t * (`false`) or backward - from end to start (`true`). Defaults to `false`.\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\t// New ranges should be copied to prevent removing them by setting them to `[]` first.\n\t\t// Only applies to situations when selection is set to the same selection or same selection's ranges.\n\t\tnewRanges = Array.from( newRanges );\n\n\t\tthis._ranges = [];\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._addRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\t}\n\n\t/**\n\t * Sets this selection instance to be marked as `fake`. A fake selection does not render as browser native selection\n\t * over selected elements and is hidden to the user. This way, no native selection UI artifacts are displayed to\n\t * the user and selection over elements can be represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM (and be\n\t * properly handled by screen readers).\n\t *\n\t * @private\n\t * @param {Object} [options] Options.\n\t * @param {Boolean} [options.fake] If set to true selection will be marked as `fake`.\n\t * @param {String} [options.label=''] Fake selection label.\n\t */\n\t_setFakeOptions( options = {} ) {\n\t\tthis._isFake = !!options.fake;\n\t\tthis._fakeSelectionLabel = options.fake ? options.label || '' : '';\n\t}\n\n\t/**\n\t * Adds a range to the selection. Added range is copied. This means that passed range is not saved in the\n\t * selection instance and you can safely operate on it.\n\t *\n\t * Accepts a flag describing in which way the selection is made - passed range might be selected from\n\t * {@link module:engine/view/range~Range#start start} to {@link module:engine/view/range~Range#end end}\n\t * or from {@link module:engine/view/range~Range#end end} to {@link module:engine/view/range~Range#start start}.\n\t * The flag is used to set {@link #anchor anchor} and {@link #focus focus} properties.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in Selection instance.\n\t *\n\t * @private\n\t * @fires change\n\t * @param {module:engine/view/range~Range} range\n\t * @param {Boolean} [isBackward]\n\t */\n\t_addRange( range, isBackward = false ) {\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\tthrow new CKEditorError( 'view-selection-invalid-range: Invalid Range.' );\n\t\t}\n\n\t\tthis._pushRange( range );\n\t\tthis._lastRangeBackward = !!isBackward;\n\t}\n\n\t/**\n\t * Adds range to selection - creates copy of given range so it can be safely used and modified.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in selection instance.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t */\n\t_pushRange( range ) {\n\t\tfor ( const storedRange of this._ranges ) {\n\t\t\tif ( range.isIntersecting( storedRange ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range from selection.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-range-intersects\n\t\t\t\t * @param {module:engine/view/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/view/range~Range} intersectingRange Range from selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-range-intersects: Trying to add a range that intersects with another range from selection.',\n\t\t\t\t\t{ addedRange: range, intersectingRange: storedRange }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\tthis._ranges.push( Range.createFromRange( range ) );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~Selection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( Selection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentselection\n */\n\nimport Selection from './selection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Class representing document selection in tree view. It's instance is stored at\n * {@link module:engine/view/document~Document#selection}. It is similar to {@link module:engine/view/selection~Selection} but\n * it has read-only API and can be modified only by writer obtained from {@link module:engine/view/view~View#change} method.\n *\n * Selection can consist of {@link module:engine/view/range~Range ranges}.\n * Selection's ranges can be obtained via {@link module:engine/view/documentselection~DocumentSelection#getRanges getRanges},\n * {@link module:engine/view/documentselection~DocumentSelection#getFirstRange getFirstRange}\n * and {@link module:engine/view/documentselection~DocumentSelection#getLastRange getLastRange}\n * methods, which return copies of ranges stored inside selection. Modifications made on these copies will not change\n * selection's state. Similar situation occurs when getting {@link module:engine/view/documentselection~DocumentSelection#anchor anchor},\n * {@link module:engine/view/documentselection~DocumentSelection#focus focus},\n * {@link module:engine/view/documentselection~DocumentSelection#getFirstPosition first} and\n * {@link module:engine/view/documentselection~DocumentSelection#getLastPosition last} positions - all will return\n * copies of requested positions.\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates new DocumentSelection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new DocumentSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tconst selection = new DocumentSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tconst selection = new DocumentSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tconst selection = new DocumentSelection( otherSelection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tconst selection = new DocumentSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new DocumentSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new DocumentSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new DocumentSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Selection is used internally (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/selection~Selection}\n\t\t */\n\t\tthis._selection = new Selection();\n\n\t\t// Delegate change event to be fired on DocumentSelection instance.\n\t\tthis._selection.delegate( 'change' ).to( this );\n\n\t\t// Set selection data.\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #_setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._selection.isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #_setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\treturn this._selection.editableElement;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/view/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tyield* this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\treturn this._selection.isEqual( otherSelection );\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\treturn this._selection.isSimilar( otherSelection );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tdocumentSelection._setTo( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tdocumentSelection._setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tdocumentSelection._setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tdocumentSelection._setTo( null );\n\t *\n\t * `Selection#_setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tdocumentSelection._setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to des cribe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tdocumentSelection._setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/position~Position.createAt} parameters.\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~DocumentSelection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( DocumentSelection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/collection\n */\n\nimport EmitterMixin from './emittermixin';\nimport CKEditorError from './ckeditorerror';\nimport uid from './uid';\nimport mix from './mix';\n\n/**\n * Collections are ordered sets of objects. Items in the collection can be retrieved by their indexes\n * in the collection (like in an array) or by their ids.\n *\n * If an object without an `id` property is being added to the collection, the `id` property will be generated\n * automatically. Note that the automatically generated id is unique only within this single collection instance.\n *\n * By default an item in the collection is identified by its `id` property. The name of the identifier can be\n * configured through the constructor of the collection.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Collection {\n\t/**\n\t * Creates a new Collection instance.\n\t *\n\t * @param {Object} [options={}] The options object.\n\t * @param {String} [options.idProperty='id'] The name of the property which is considered to identify an item.\n\t */\n\tconstructor( options = {} ) {\n\t\t/**\n\t\t * The internal list of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Object[]}\n\t\t */\n\t\tthis._items = [];\n\n\t\t/**\n\t\t * The internal map of items in the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._itemMap = new Map();\n\n\t\t/**\n\t\t * The name of the property which is considered to identify an item.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._idProperty = options.idProperty || 'id';\n\n\t\t/**\n\t\t * A helper mapping external items of a bound collection ({@link #bindTo})\n\t\t * and actual items of this collection. It provides information\n\t\t * necessary to properly remove items bound to another collection.\n\t\t *\n\t\t * See {@link #_bindToInternalToExternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToExternalToInternalMap = new WeakMap();\n\n\t\t/**\n\t\t * A helper mapping items of this collection to external items of a bound collection\n\t\t * ({@link #bindTo}). It provides information necessary to manage the bindings, e.g.\n\t\t * to avoid loops in two–way bindings.\n\t\t *\n\t\t * See {@link #_bindToExternalToInternalMap}.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._bindToInternalToExternalMap = new WeakMap();\n\n\t\t/**\n\t\t * Stores indexes of skipped items from bound external collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Array}\n\t\t */\n\t\tthis._skippedIndexesFromExternal = [];\n\n\t\t/**\n\t\t * A collection instance this collection is bound to as a result\n\t\t * of calling {@link #bindTo} method.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/collection~Collection} #_bindToCollection\n\t\t */\n\t}\n\n\t/**\n\t * The number of items available in the collection.\n\t *\n\t * @member {Number} #length\n\t */\n\tget length() {\n\t\treturn this._items.length;\n\t}\n\n\t/**\n\t * Returns the first item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The first item or `null` if collection is empty.\n\t */\n\tget first() {\n\t\treturn this._items[ 0 ] || null;\n\t}\n\n\t/**\n\t * Returns the last item from the collection or null when collection is empty.\n\t *\n\t * @returns {Object|null} The last item or `null` if collection is empty.\n\t */\n\tget last() {\n\t\treturn this._items[ this.length - 1 ] || null;\n\t}\n\n\t/**\n\t * Adds an item into the collection.\n\t *\n\t * If the item does not have an id, then it will be automatically generated and set on the item.\n\t *\n\t * @chainable\n\t * @param {Object} item\n\t * @param {Number} [index] The position of the item in the collection. The item\n\t * is pushed to the collection when `index` not specified.\n\t * @fires add\n\t */\n\tadd( item, index ) {\n\t\tlet itemId;\n\t\tconst idProperty = this._idProperty;\n\n\t\tif ( ( idProperty in item ) ) {\n\t\t\titemId = item[ idProperty ];\n\n\t\t\tif ( typeof itemId != 'string' ) {\n\t\t\t\t/**\n\t\t\t\t * This item's id should be a string.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-invalid-id\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-invalid-id' );\n\t\t\t}\n\n\t\t\tif ( this.get( itemId ) ) {\n\t\t\t\t/**\n\t\t\t\t * This item already exists in the collection.\n\t\t\t\t *\n\t\t\t\t * @error collection-add-item-already-exists\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'collection-add-item-already-exists' );\n\t\t\t}\n\t\t} else {\n\t\t\titem[ idProperty ] = itemId = uid();\n\t\t}\n\n\t\t// TODO: Use ES6 default function argument.\n\t\tif ( index === undefined ) {\n\t\t\tindex = this._items.length;\n\t\t} else if ( index > this._items.length || index < 0 ) {\n\t\t\t/**\n\t\t\t * The index number has invalid value.\n\t\t\t *\n\t\t\t * @error collection-add-item-bad-index\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-add-item-invalid-index' );\n\t\t}\n\n\t\tthis._items.splice( index, 0, item );\n\n\t\tthis._itemMap.set( itemId, item );\n\n\t\tthis.fire( 'add', item, index );\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Gets item by its id or index.\n\t *\n\t * @param {String|Number} idOrIndex The item id or index in the collection.\n\t * @returns {Object|null} The requested item or `null` if such item does not exist.\n\t */\n\tget( idOrIndex ) {\n\t\tlet item;\n\n\t\tif ( typeof idOrIndex == 'string' ) {\n\t\t\titem = this._itemMap.get( idOrIndex );\n\t\t} else if ( typeof idOrIndex == 'number' ) {\n\t\t\titem = this._items[ idOrIndex ];\n\t\t} else {\n\t\t\t/**\n\t\t\t * Index or id must be given.\n\t\t\t *\n\t\t\t * @error collection-get-invalid-arg\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-get-invalid-arg: Index or id must be given.' );\n\t\t}\n\n\t\treturn item || null;\n\t}\n\n\t/**\n\t * Gets index of item in the collection.\n\t * When item is not defined in the collection then index will be equal -1.\n\t *\n\t * @param {String|Object} idOrItem The item or its id in the collection.\n\t * @returns {Number} Index of given item.\n\t */\n\tgetIndex( idOrItem ) {\n\t\tlet item;\n\n\t\tif ( typeof idOrItem == 'string' ) {\n\t\t\titem = this._itemMap.get( idOrItem );\n\t\t} else {\n\t\t\titem = idOrItem;\n\t\t}\n\n\t\treturn this._items.indexOf( item );\n\t}\n\n\t/**\n\t * Removes an item from the collection.\n\t *\n\t * @param {Object|Number|String} subject The item to remove, its id or index in the collection.\n\t * @returns {Object} The removed item.\n\t * @fires remove\n\t */\n\tremove( subject ) {\n\t\tlet index, id, item;\n\t\tlet itemDoesNotExist = false;\n\t\tconst idProperty = this._idProperty;\n\n\t\tif ( typeof subject == 'string' ) {\n\t\t\tid = subject;\n\t\t\titem = this._itemMap.get( id );\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tindex = this._items.indexOf( item );\n\t\t\t}\n\t\t} else if ( typeof subject == 'number' ) {\n\t\t\tindex = subject;\n\t\t\titem = this._items[ index ];\n\t\t\titemDoesNotExist = !item;\n\n\t\t\tif ( item ) {\n\t\t\t\tid = item[ idProperty ];\n\t\t\t}\n\t\t} else {\n\t\t\titem = subject;\n\t\t\tid = item[ idProperty ];\n\t\t\tindex = this._items.indexOf( item );\n\t\t\titemDoesNotExist = ( index == -1 || !this._itemMap.get( id ) );\n\t\t}\n\n\t\tif ( itemDoesNotExist ) {\n\t\t\t/**\n\t\t\t * Item not found.\n\t\t\t *\n\t\t\t * @error collection-remove-404\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-remove-404: Item not found.' );\n\t\t}\n\n\t\tthis._items.splice( index, 1 );\n\t\tthis._itemMap.delete( id );\n\n\t\tconst externalItem = this._bindToInternalToExternalMap.get( item );\n\t\tthis._bindToInternalToExternalMap.delete( item );\n\t\tthis._bindToExternalToInternalMap.delete( externalItem );\n\n\t\tthis.fire( 'remove', item, index );\n\n\t\treturn item;\n\t}\n\n\t/**\n\t * Executes the callback for each item in the collection and composes an array or values returned by this callback.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @params {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Array} The result of mapping.\n\t */\n\tmap( callback, ctx ) {\n\t\treturn this._items.map( callback, ctx );\n\t}\n\n\t/**\n\t * Finds the first item in the collection for which the `callback` returns a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @returns {Object} The item for which `callback` returned a true value.\n\t * @params {Object} ctx Context in which the `callback` will be called.\n\t */\n\tfind( callback, ctx ) {\n\t\treturn this._items.find( callback, ctx );\n\t}\n\n\t/**\n\t * Returns an array with items for which the `callback` returned a true value.\n\t *\n\t * @param {Function} callback\n\t * @param {Object} callback.item\n\t * @param {Number} callback.index\n\t * @params {Object} ctx Context in which the `callback` will be called.\n\t * @returns {Object[]} The array with matching items.\n\t */\n\tfilter( callback, ctx ) {\n\t\treturn this._items.filter( callback, ctx );\n\t}\n\n\t/**\n\t * Removes all items from the collection and destroys the binding created using\n\t * {@link #bindTo}.\n\t */\n\tclear() {\n\t\tif ( this._bindToCollection ) {\n\t\t\tthis.stopListening( this._bindToCollection );\n\t\t\tthis._bindToCollection = null;\n\t\t}\n\n\t\twhile ( this.length ) {\n\t\t\tthis.remove( 0 );\n\t\t}\n\t}\n\n\t/**\n\t * Binds and synchronizes the collection with another one.\n\t *\n\t * The binding can be a simple factory:\n\t *\n\t *\t\tclass FactoryClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).as( FactoryClass );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 1 ).label ); // 'bar'\n\t *\n\t *\t\tsource.remove( 0 );\n\t *\t\tconsole.log( target.length ); // 1\n\t *\t\tconsole.log( target.get( 0 ).label ); // 'bar'\n\t *\n\t * or the factory driven by a custom callback:\n\t *\n\t *\t\tclass FooClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tclass BarClass {\n\t *\t\t\tconstructor( data ) {\n\t *\t\t\t\tthis.label = data.label;\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( ( item ) => {\n\t *\t\t\tif ( item.label == 'foo' ) {\n\t *\t\t\t\treturn new FooClass( item );\n\t *\t\t\t} else {\n\t *\t\t\t\treturn new BarClass( item );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { label: 'foo' } );\n\t *\t\tsource.add( { label: 'bar' } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ) instanceof FooClass ); // true\n\t *\t\tconsole.log( target.get( 1 ) instanceof BarClass ); // true\n\t *\n\t * or the factory out of property name:\n\t *\n\t *\t\tconst source = new Collection( { idProperty: 'label' } );\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( 'label' );\n\t *\n\t *\t\tsource.add( { label: { value: 'foo' } } );\n\t *\t\tsource.add( { label: { value: 'bar' } } );\n\t *\n\t *\t\tconsole.log( target.length ); // 2\n\t *\t\tconsole.log( target.get( 0 ).value ); // 'foo'\n\t *\t\tconsole.log( target.get( 1 ).value ); // 'bar'\n\t *\n\t * It's possible to skip specified items by returning falsy value:\n\t *\n\t *\t\tconst source = new Collection();\n\t *\t\tconst target = new Collection();\n\t *\n\t *\t\ttarget.bindTo( source ).using( item => {\n\t *\t\t\tif ( item.hidden ) {\n\t *\t\t\t\treturn null;\n\t *\t\t\t}\n\t *\n\t *\t\t\treturn item;\n\t *\t\t} );\n\t *\n\t *\t\tsource.add( { hidden: true } );\n\t *\t\tsource.add( { hidden: false } );\n\t *\n\t *\t\tconsole.log( source.length ); // 2\n\t *\t\tconsole.log( target.length ); // 1\n\t *\n\t * **Note**: {@link #clear} can be used to break the binding.\n\t *\n\t * @param {module:utils/collection~Collection} externalCollection A collection to be bound.\n\t * @returns {Object}\n\t * @returns {module:utils/collection~Collection#bindTo#as} return.as\n\t * @returns {module:utils/collection~Collection#bindTo#using} return.using\n\t */\n\tbindTo( externalCollection ) {\n\t\tif ( this._bindToCollection ) {\n\t\t\t/**\n\t\t\t * The collection cannot be bound more than once.\n\t\t\t *\n\t\t\t * @error collection-bind-to-rebind\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'collection-bind-to-rebind: The collection cannot be bound more than once.' );\n\t\t}\n\n\t\tthis._bindToCollection = externalCollection;\n\n\t\treturn {\n\t\t\t/**\n\t\t\t * Creates the class factory binding.\n\t\t\t *\n\t\t\t * @static\n\t\t\t * @param {Function} Class Specifies which class factory is to be initialized.\n\t\t\t */\n\t\t\tas: Class => {\n\t\t\t\tthis._setUpBindToBinding( item => new Class( item ) );\n\t\t\t},\n\n\t\t\t/**\n\t\t\t * Creates callback or property binding.\n\t\t\t *\n\t\t\t * @static\n\t\t\t * @param {Function|String} callbackOrProperty When the function is passed, it is used to\n\t\t\t * produce the items. When the string is provided, the property value is used to create\n\t\t\t * the bound collection items.\n\t\t\t */\n\t\t\tusing: callbackOrProperty => {\n\t\t\t\tif ( typeof callbackOrProperty == 'function' ) {\n\t\t\t\t\tthis._setUpBindToBinding( item => callbackOrProperty( item ) );\n\t\t\t\t} else {\n\t\t\t\t\tthis._setUpBindToBinding( item => item[ callbackOrProperty ] );\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Finalizes and activates a binding initiated by {#bindTo}.\n\t *\n\t * @protected\n\t * @param {Function} factory A function which produces collection items.\n\t */\n\t_setUpBindToBinding( factory ) {\n\t\tconst externalCollection = this._bindToCollection;\n\n\t\t// Adds the item to the collection once a change has been done to the external collection.\n\t\t//\n\t\t// @private\n\t\tconst addItem = ( evt, externalItem, index ) => {\n\t\t\tconst isExternalBoundToThis = externalCollection._bindToCollection == this;\n\t\t\tconst externalItemBound = externalCollection._bindToInternalToExternalMap.get( externalItem );\n\n\t\t\t// If an external collection is bound to this collection, which makes it a 2–way binding,\n\t\t\t// and the particular external collection item is already bound, don't add it here.\n\t\t\t// The external item has been created **out of this collection's item** and (re)adding it will\n\t\t\t// cause a loop.\n\t\t\tif ( isExternalBoundToThis && externalItemBound ) {\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, externalItemBound );\n\t\t\t\tthis._bindToInternalToExternalMap.set( externalItemBound, externalItem );\n\t\t\t} else {\n\t\t\t\tconst item = factory( externalItem );\n\n\t\t\t\t// When there is no item we need to remember skipped index first and then we can skip this item.\n\t\t\t\tif ( !item ) {\n\t\t\t\t\tthis._skippedIndexesFromExternal.push( index );\n\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Lets try to put item at the same index as index in external collection\n\t\t\t\t// but when there are a skipped items in one or both collections we need to recalculate this index.\n\t\t\t\tlet finalIndex = index;\n\n\t\t\t\t// When we try to insert item after some skipped items from external collection we need\n\t\t\t\t// to include this skipped items and decrease index.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal' ]\n\t\t\t\t// internal -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'B - skipped for internal', 'C - skipped for internal', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We can't just add 'D' to internal at the same index as index in external because\n\t\t\t\t// this will produce empty indexes what is invalid:\n\t\t\t\t// internal -> [ 'A', empty, empty, 'D' ]\n\t\t\t\t//\n\t\t\t\t// So we need to include skipped items and decrease index\n\t\t\t\t// internal -> [ 'A', 'D' ]\n\t\t\t\tfor ( const skipped of this._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\t\tfinalIndex--;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// We need to take into consideration that external collection could skip some items from\n\t\t\t\t// internal collection.\n\t\t\t\t//\n\t\t\t\t// For the following example:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external' ]\n\t\t\t\t// external -> [ A ]\n\t\t\t\t//\n\t\t\t\t// Another item is been added at the end of external collection:\n\t\t\t\t// external.add( 'D' )\n\t\t\t\t// external -> [ 'A', 'D' ]\n\t\t\t\t//\n\t\t\t\t// We need to include skipped items and place new item after them:\n\t\t\t\t// internal -> [ 'A', 'B - skipped for external', 'C - skipped for external', 'D' ]\n\t\t\t\tfor ( const skipped of externalCollection._skippedIndexesFromExternal ) {\n\t\t\t\t\tif ( finalIndex >= skipped ) {\n\t\t\t\t\t\tfinalIndex++;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tthis._bindToExternalToInternalMap.set( externalItem, item );\n\t\t\t\tthis._bindToInternalToExternalMap.set( item, externalItem );\n\t\t\t\tthis.add( item, finalIndex );\n\n\t\t\t\t// After adding new element to internal collection we need update indexes\n\t\t\t\t// of skipped items in external collection.\n\t\t\t\tfor ( let i = 0; i < externalCollection._skippedIndexesFromExternal.length; i++ ) {\n\t\t\t\t\tif ( finalIndex <= externalCollection._skippedIndexesFromExternal[ i ] ) {\n\t\t\t\t\t\texternalCollection._skippedIndexesFromExternal[ i ]++;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\n\t\t// Load the initial content of the collection.\n\t\tfor ( const externalItem of externalCollection ) {\n\t\t\taddItem( null, externalItem, externalCollection.getIndex( externalItem ) );\n\t\t}\n\n\t\t// Synchronize the with collection as new items are added.\n\t\tthis.listenTo( externalCollection, 'add', addItem );\n\n\t\t// Synchronize the with collection as new items are removed.\n\t\tthis.listenTo( externalCollection, 'remove', ( evt, externalItem, index ) => {\n\t\t\tconst item = this._bindToExternalToInternalMap.get( externalItem );\n\n\t\t\tif ( item ) {\n\t\t\t\tthis.remove( item );\n\t\t\t}\n\n\t\t\t// After removing element from external collection we need update/remove indexes\n\t\t\t// of skipped items in internal collection.\n\t\t\tthis._skippedIndexesFromExternal = this._skippedIndexesFromExternal.reduce( ( result, skipped ) => {\n\t\t\t\tif ( index < skipped ) {\n\t\t\t\t\tresult.push( skipped - 1 );\n\t\t\t\t}\n\n\t\t\t\tif ( index > skipped ) {\n\t\t\t\t\tresult.push( skipped );\n\t\t\t\t}\n\n\t\t\t\treturn result;\n\t\t\t}, [] );\n\t\t} );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._items[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Fired when an item is added to the collection.\n\t *\n\t * @event add\n\t * @param {Object} item The added item.\n\t */\n\n\t/**\n\t * Fired when an item is removed from the collection.\n\t *\n\t * @event remove\n\t * @param {Object} item The removed item.\n\t * @param {Number} index Index from which item was removed.\n\t */\n}\n\nmix( Collection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/document\n */\n\nimport DocumentSelection from './documentselection';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\n/**\n * Document class creates an abstract layer over the content editable area, contains a tree of view elements and\n * {@link module:engine/view/documentselection~DocumentSelection view selection} associated with this document.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Document {\n\t/**\n\t * Creates a Document instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Selection done on this document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection} module:engine/view/document~Document#selection\n\t\t */\n\t\tthis.selection = new DocumentSelection();\n\n\t\t/**\n\t\t * Roots of the view tree. Collection of the {module:engine/view/element~Element view elements}.\n\t\t *\n\t\t * View roots are created as a result of binding between {@link module:engine/view/document~Document#roots} and\n\t\t * {@link module:engine/model/document~Document#roots} and this is handled by\n\t\t * {@link module:engine/controller/editingcontroller~EditingController}, so to create view root we need to create\n\t\t * model root using {@link module:engine/model/document~Document#createRoot}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Collection} module:engine/view/document~Document#roots\n\t\t */\n\t\tthis.roots = new Collection( { idProperty: 'rootName' } );\n\n\t\t/**\n\t\t * Defines whether document is in read-only mode.\n\t\t *\n\t\t * When document is read-ony then all roots are read-only as well and caret placed inside this root is hidden.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * True if document is focused.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/focusobserver~FocusObserver}.\n\t\t * If the {@link module:engine/view/observer/focusobserver~FocusObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * True if composition is in progress inside the document.\n\t\t *\n\t\t * This property is updated by the {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n\t\t * If the {@link module:engine/view/observer/compositionobserver~CompositionObserver} is disabled this property will not change.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/document~Document#isComposing\n\t\t */\n\t\tthis.set( 'isComposing', false );\n\n\t\t/**\n\t\t * Post-fixer callbacks registered to the view document.\n\t\t *\n\t\t * @private\n\t\t * @member {Set}\n\t\t */\n\t\tthis._postFixers = new Set();\n\t}\n\n\t/**\n\t * Gets a {@link module:engine/view/document~Document#roots view root element} with the specified name. If the name is not\n\t * specific \"main\" root is returned.\n\t *\n\t * @param {String} [name='main'] Name of the root.\n\t * @returns {module:engine/view/rooteditableelement~RootEditableElement|null} The view root element with the specified name\n\t * or null when there is no root of given name.\n\t */\n\tgetRoot( name = 'main' ) {\n\t\treturn this.roots.get( name );\n\t}\n\n\t/**\n\t * Used to register a post-fixer callback. A post-fixers mechanism allows to update view tree just before rendering\n\t * to the DOM.\n\t *\n\t * Post-fixers are fired just after all changes from the outermost change block were applied but\n\t * before the {@link module:engine/view/view~View#event:render render event} is fired. If a post-fixer callback made\n\t * a change, it should return `true`. When this happens, all post-fixers are fired again to check if something else should\n\t * not be fixed in the new document tree state.\n\t *\n\t * View post-fixers are useful when you wants to update view structure whenever it changes, for instance add some classes\n\t * to elements based on the view structure or selection. However, is you need DOM elements to be already updated, use\n\t * {@link module:engine/view/view~View#event:render render event}.\n\t *\n\t * As a parameter, a post-fixer callback receives a {@link module:engine/view/writer~Writer writer} instance connected with the\n\t * executed changes block.\n\t *\n\t * @param {Function} postFixer\n\t */\n\tregisterPostFixer( postFixer ) {\n\t\tthis._postFixers.add( postFixer );\n\t}\n\n\t/**\n\t * Performs post-fixer loops. Executes post-fixer callbacks as long as none of them has done any changes to the model.\n\t *\n\t * @protected\n\t * @param {module:engine/view/writer~Writer} writer\n\t */\n\t_callPostFixers( writer ) {\n\t\tlet wasFixed = false;\n\n\t\tdo {\n\t\t\tfor ( const callback of this._postFixers ) {\n\t\t\t\twasFixed = callback( writer );\n\n\t\t\t\tif ( wasFixed ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} while ( wasFixed );\n\t}\n\n\t/**\n\t * Event fired whenever document content layout changes. It is fired whenever content is\n\t * {@link module:engine/view/view~View#event:render rendered}, but should be also fired by observers in case of\n\t * other actions which may change layout, for instance when image loads.\n\t *\n\t * @event layoutChanged\n\t */\n}\n\nmix( Document, ObservableMixin );\n\n/**\n * Enum representing type of the change.\n *\n * Possible values:\n *\n * * `children` - for child list changes,\n * * `attributes` - for element attributes changes,\n * * `text` - for text nodes changes.\n *\n * @typedef {String} module:engine/view/document~ChangeType\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/attributeelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n// Default attribute priority.\nconst DEFAULT_PRIORITY = 10;\n\n/**\n * Attributes are elements which define document presentation. They are mostly elements like `<b>` or `<span>`.\n * Attributes can be broken and merged by the {@link module:engine/view/writer~Writer view writer}.\n *\n * Editing engine does not define fixed HTML DTD. This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. Creating an element you should use {@link module:engine/view/containerelement~ContainerElement}\n * class or `AttributeElement`.\n *\n * @extends module:engine/view/element~Element\n */\nexport default class AttributeElement extends Element {\n\t/**\n\t * Creates a attribute element.\n\t *\n\t * @see module:engine/view/writer~Writer#createAttributeElement\n\t * @protected\n\t * @see module:engine/view/element~Element\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\n\t\t/**\n\t\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/writer~Writer}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Number}\n\t\t */\n\t\tthis._priority = DEFAULT_PRIORITY;\n\n\t\t/**\n\t\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t\t * and then two elements are considered similar if, and only if they have the same `_id`.\n\t\t *\n\t\t * @protected\n\t\t * @member {String|Number}\n\t\t */\n\t\tthis._id = null;\n\n\t\t/**\n\t\t * Keeps all the attribute elements that have the same {@link module:engine/view/attributeelement~AttributeElement#id ids}\n\t\t * and still exist in the view tree.\n\t\t *\n\t\t * This property is managed by {@link module:engine/view/writer~Writer}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set|null}\n\t\t */\n\t\tthis._clonesGroup = null;\n\t}\n\n\t/**\n\t * Element priority. Decides in what order elements are wrapped by {@link module:engine/view/writer~Writer}.\n\t *\n\t * @readonly\n\t * @returns {Number}\n\t */\n\tget priority() {\n\t\treturn this._priority;\n\t}\n\n\t/**\n\t * Element identifier. If set, it is used by {@link module:engine/view/element~Element#isSimilar},\n\t * and then two elements are considered similar if, and only if they have the same `id`.\n\t *\n\t * @readonly\n\t * @returns {String|Number}\n\t */\n\tget id() {\n\t\treturn this._id;\n\t}\n\n\t/**\n\t * Returns all {@link module:engine/view/attributeelement~AttributeElement attribute elements} that has the\n\t * same {@link module:engine/view/attributeelement~AttributeElement#id id} and are in the view tree (were not removed).\n\t *\n\t * Note: If this element has been removed from the tree, returned set will not include it.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError attribute-element-get-elements-with-same-id-no-id}\n\t * if this element has no `id`.\n\t *\n\t * @returns {Set.<module:engine/view/attributeelement~AttributeElement>} Set containing all the attribute elements\n\t * with the same `id` that were added and not removed from the view tree.\n\t */\n\tgetElementsWithSameId() {\n\t\tif ( this.id === null ) {\n\t\t\t/**\n\t\t\t * Cannot get elements with the same id for an attribute element without id.\n\t\t\t *\n\t\t\t * @error attribute-element-get-elements-with-same-id-no-id\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'attribute-element-get-elements-with-same-id-no-id: ' +\n\t\t\t\t'Cannot get elements with the same id for an attribute element without id.'\n\t\t\t);\n\t\t}\n\n\t\treturn new Set( this._clonesGroup );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'attributeElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'attributeElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t *\n\t * If none of elements has set {@link module:engine/view/attributeelement~AttributeElement#id}, then both elements\n\t * should have the same name, attributes and priority to be considered as similar. Two similar elements can contain\n\t * different set of children nodes.\n\t *\n\t * If at least one element has {@link module:engine/view/attributeelement~AttributeElement#id} set, then both\n\t * elements have to have the same {@link module:engine/view/attributeelement~AttributeElement#id} value to be\n\t * considered similar.\n\t *\n\t * Similarity is important for {@link module:engine/view/writer~Writer}. For example:\n\t *\n\t * * two following similar elements can be merged together into one, longer element,\n\t * * {@link module:engine/view/writer~Writer#unwrap} checks similarity of passed element and processed element to\n\t * decide whether processed element should be unwrapped,\n\t * * etc.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\t// If any element has an `id` set, just compare the ids.\n\t\tif ( this.id !== null || otherElement.id !== null ) {\n\t\t\treturn this.id === otherElement.id;\n\t\t}\n\n\t\treturn super.isSimilar( otherElement ) && this.priority == otherElement.priority;\n\t}\n\n\t/**\n\t * Clones provided element with priority.\n\t *\n\t * @protected\n\t * @param {Boolean} deep If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Clone of this element.\n\t */\n\t_clone( deep ) {\n\t\tconst cloned = super._clone( deep );\n\n\t\t// Clone priority too.\n\t\tcloned._priority = this._priority;\n\n\t\t// And id too.\n\t\tcloned._id = this._id;\n\n\t\treturn cloned;\n\t}\n}\n\n/**\n * Default attribute priority.\n *\n * @member {Number} module:engine/view/attributeelement~AttributeElement.DEFAULT_PRIORITY\n */\nAttributeElement.DEFAULT_PRIORITY = DEFAULT_PRIORITY;\n\n// Returns block {@link module:engine/view/filler~Filler filler} offset or `null` if block filler is not needed.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\t// <b>foo</b> does not need filler.\n\tif ( nonUiChildrenCount( this ) ) {\n\t\treturn null;\n\t}\n\n\tlet element = this.parent;\n\n\t// <p><b></b></p> needs filler -> <p><b><br></b></p>\n\twhile ( element && element.is( 'attributeElement' ) ) {\n\t\tif ( nonUiChildrenCount( element ) > 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\telement = element.parent;\n\t}\n\n\tif ( !element || nonUiChildrenCount( element ) > 1 ) {\n\t\treturn null;\n\t}\n\n\t// Render block filler at the end of element (after all ui elements).\n\treturn this.childCount;\n}\n\n// Returns total count of children that are not {@link module:engine/view/uielement~UIElement UIElements}.\n//\n// @param {module:engine/view/element~Element} element\n// @returns {Number}\nfunction nonUiChildrenCount( element ) {\n\treturn Array.from( element.getChildren() ).filter( element => !element.is( 'uiElement' ) ).length;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/emptyelement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\n\n/**\n * EmptyElement class. It is used to represent elements that cannot contain any child nodes.\n */\nexport default class EmptyElement extends Element {\n\t/**\n\t * Creates new instance of EmptyElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` when third parameter is passed,\n\t * to inform that usage of EmptyElement is incorrect (adding child nodes to EmptyElement is forbidden).\n\t *\n\t * @see module:engine/view/writer~Writer#createEmptyElement\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attributes] Collection of attributes.\n\t */\n\tconstructor( name, attributes, children ) {\n\t\tsuper( name, attributes, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for EmptyElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'emptyElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'emptyElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-emptyelement-cannot-add` to prevent\n\t * adding any child nodes to EmptyElement.\n\t *\n\t * @protected\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/emptyelement~EmptyElement}.\n\t\t\t *\n\t\t\t * @error view-emptyelement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-emptyelement-cannot-add: Cannot add child nodes to EmptyElement instance.' );\n\t\t}\n\t}\n}\n\n// Returns `null` because block filler is not needed for EmptyElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals navigator:false */\n\n/**\n * @module utils/env\n */\n\nconst userAgent = navigator.userAgent.toLowerCase();\n\n/**\n * A namespace containing environment and browser information.\n *\n * @namespace\n */\nconst env = {\n\t/**\n\t * Indicates that the application is running on Macintosh.\n\t *\n\t * @static\n\t * @member {Boolean} module:utils/env~env#isMac\n\t */\n\tisMac: isMac( userAgent ),\n\n\t/**\n\t * Indicates that the application is running in Microsoft Edge.\n\t *\n\t * @static\n\t * @member {Boolean} module:utils/env~env#isEdge\n\t */\n\tisEdge: isEdge( userAgent )\n};\n\nexport default env;\n\n/**\n * Checks if User Agent represented by the string is running on Macintosh.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is running on Macintosh or not.\n */\nexport function isMac( userAgent ) {\n\treturn userAgent.indexOf( 'macintosh' ) > -1;\n}\n\n/**\n * Checks if User Agent represented by the string is Microsoft Edge.\n *\n * @param {String} userAgent **Lowercase** `navigator.userAgent` string.\n * @returns {Boolean} Whether User Agent is Edge or not.\n */\nexport function isEdge( userAgent ) {\n\treturn !!userAgent.match( /edge\\/(\\d+.?\\d*)/ );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * Set of utils related to keyboard support.\n *\n * @module utils/keyboard\n */\n\nimport CKEditorError from './ckeditorerror';\nimport env from './env';\n\nconst macGlyphsToModifiers = {\n\t'⌘': 'ctrl',\n\t'⇧': 'shift',\n\t'⌥': 'alt'\n};\n\nconst modifiersToMacGlyphs = {\n\t'ctrl': '⌘',\n\t'shift': '⇧',\n\t'alt': '⌥'\n};\n\n/**\n * Object with `keyName => keyCode` pairs for a set of known keys.\n *\n * Contains:\n *\n * * `a-z`,\n * * `0-9`,\n * * `f1-f12`,\n * * `arrow(left|up|right|bottom)`,\n * * `backspace`, `delete`, `enter`, `esc`, `tab`,\n * * `ctrl`, `cmd`, `shift`, `alt`.\n */\nexport const keyCodes = generateKnownKeyCodes();\n\n/**\n * Converts a key name or a {@link module:utils/keyboard~KeystrokeInfo keystroke info} into a key code.\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * @param {String|module:utils/keyboard~KeystrokeInfo} Key name (see {@link module:utils/keyboard~keyCodes})\n * or a keystroke data object.\n * @returns {Number} Key or keystroke code.\n */\nexport function getCode( key ) {\n\tlet keyCode;\n\n\tif ( typeof key == 'string' ) {\n\t\tkeyCode = keyCodes[ key.toLowerCase() ];\n\n\t\tif ( !keyCode ) {\n\t\t\t/**\n\t\t\t * Unknown key name. Only key names contained by the {@link module:utils/keyboard~keyCodes} can be used.\n\t\t\t *\n\t\t\t * @errror keyboard-unknown-key\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'keyboard-unknown-key: Unknown key name.', { key } );\n\t\t}\n\t} else {\n\t\tkeyCode = key.keyCode +\n\t\t\t( key.altKey ? keyCodes.alt : 0 ) +\n\t\t\t( key.ctrlKey ? keyCodes.ctrl : 0 ) +\n\t\t\t( key.shiftKey ? keyCodes.shift : 0 );\n\t}\n\n\treturn keyCode;\n}\n\n/**\n * Parses keystroke and returns a keystroke code that will match the code returned by\n * link {@link module:utils/keyboard.getCode} for a corresponding {@link module:utils/keyboard~KeystrokeInfo keystroke info}.\n *\n * The keystroke can be passed in two formats:\n *\n * * as a single string – e.g. `ctrl + A`,\n * * as an array of {@link module:utils/keyboard~keyCodes known key names} and key codes – e.g.:\n *   * `[ 'ctrl', 32 ]` (ctrl + space),\n *   * `[ 'ctrl', 'a' ]` (ctrl + A).\n *\n * Note: Key names are matched with {@link module:utils/keyboard~keyCodes} in a case-insensitive way.\n *\n * Note: Only keystrokes with a single non-modifier key are supported (e.g. `ctrl+A` is OK, but `ctrl+A+B` is not).\n *\n * @param {String|Array.<Number|String>} keystroke Keystroke definition.\n * @returns {Number} Keystroke code.\n */\nexport function parseKeystroke( keystroke ) {\n\tif ( typeof keystroke == 'string' ) {\n\t\tkeystroke = splitKeystrokeText( keystroke );\n\t}\n\n\treturn keystroke\n\t\t.map( key => ( typeof key == 'string' ) ? getCode( key ) : key )\n\t\t.reduce( ( key, sum ) => sum + key, 0 );\n}\n\n/**\n * It translates any keystroke string text like `\"CTRL+A\"` to an\n * environment–specific keystroke, i.e. `\"⌘A\"` on Mac OSX.\n *\n * @param {String} keystroke Keystroke text.\n * @returns {String} Keystroke text specific for the environment.\n */\nexport function getEnvKeystrokeText( keystroke ) {\n\tif ( !env.isMac ) {\n\t\treturn keystroke;\n\t}\n\n\treturn splitKeystrokeText( keystroke )\n\t\t// Replace modifiers (e.g. \"ctrl\") with Mac glyphs (e.g. \"⌘\") first.\n\t\t.map( key => modifiersToMacGlyphs[ key.toLowerCase() ] || key )\n\n\t\t// Decide whether to put \"+\" between keys in the keystroke or not.\n\t\t.reduce( ( value, key ) => {\n\t\t\tif ( value.slice( -1 ) in macGlyphsToModifiers ) {\n\t\t\t\treturn value + key;\n\t\t\t} else {\n\t\t\t\treturn value + '+' + key;\n\t\t\t}\n\t\t} );\n}\n\nfunction generateKnownKeyCodes() {\n\tconst keyCodes = {\n\t\tarrowleft: 37,\n\t\tarrowup: 38,\n\t\tarrowright: 39,\n\t\tarrowdown: 40,\n\t\tbackspace: 8,\n\t\tdelete: 46,\n\t\tenter: 13,\n\t\tspace: 32,\n\t\tesc: 27,\n\t\ttab: 9,\n\n\t\t// The idea about these numbers is that they do not collide with any real key codes, so we can use them\n\t\t// like bit masks.\n\t\tctrl: 0x110000,\n\t\t// Has the same code as ctrl, because their behaviour should be unified across the editor.\n\t\t// See http://ckeditor.github.io/editor-recommendations/general-policies#ctrl-vs-cmd\n\t\tcmd: 0x110000,\n\t\tshift: 0x220000,\n\t\talt: 0x440000\n\t};\n\n\t// a-z\n\tfor ( let code = 65; code <= 90; code++ ) {\n\t\tconst letter = String.fromCharCode( code );\n\n\t\tkeyCodes[ letter.toLowerCase() ] = code;\n\t}\n\n\t// 0-9\n\tfor ( let code = 48; code <= 57; code++ ) {\n\t\tkeyCodes[ code - 48 ] = code;\n\t}\n\n\t// F1-F12\n\tfor ( let code = 112; code <= 123; code++ ) {\n\t\tkeyCodes[ 'f' + ( code - 111 ) ] = code;\n\t}\n\n\treturn keyCodes;\n}\n\nfunction splitKeystrokeText( keystroke ) {\n\treturn keystroke.split( /\\s*\\+\\s*/ );\n}\n\n/**\n * Information about a keystroke.\n *\n * @interface module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * The [key code](https://developer.mozilla.org/en-US/docs/Web/API/KeyboardEvent/keyCode).\n *\n * @member {Number} module:utils/keyboard~KeystrokeInfo#keyCode\n */\n\n/**\n * Whether the <kbd>Alt</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#altKey\n */\n\n/**\n * Whether the <kbd>Ctrl</kbd> or <kbd>Cmd</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#ctrlKey\n */\n\n/**\n * Whether the <kbd>Shift</kbd> modifier was pressed.\n *\n * @member {Bolean} module:utils/keyboard~KeystrokeInfo#shiftKey\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/uielement\n */\n\nimport Element from './element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Node from './node';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * UIElement class. It is used to represent UI not a content of the document.\n * This element can't be split and selection can't be placed inside this element.\n */\nexport default class UIElement extends Element {\n\t/**\n\t * Creates new instance of UIElement.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` when third parameter is passed,\n\t * to inform that usage of UIElement is incorrect (adding child nodes to UIElement is forbidden).\n\t *\n\t * @see module:engine/view/writer~Writer#createUIElement\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attributes] Collection of attributes.\n\t */\n\tconstructor( name, attributes, children ) {\n\t\tsuper( name, attributes, children );\n\n\t\t/**\n\t\t * Returns `null` because filler is not needed for UIElements.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {null} Always returns null.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'uiElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'uiElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Overrides {@link module:engine/view/element~Element#_insertChild} method.\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-uielement-cannot-add` to prevent adding any child nodes\n\t * to UIElement.\n\t */\n\t_insertChild( index, nodes ) {\n\t\tif ( nodes && ( nodes instanceof Node || Array.from( nodes ).length > 0 ) ) {\n\t\t\t/**\n\t\t\t * Cannot add children to {@link module:engine/view/uielement~UIElement}.\n\t\t\t *\n\t\t\t * @error view-uielement-cannot-add\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-uielement-cannot-add: Cannot add child nodes to UIElement instance.' );\n\t\t}\n\t}\n\n\t/**\n\t * Renders this {@link module:engine/view/uielement~UIElement} to DOM. This method is called by\n\t * {@link module:engine/view/domconverter~DomConverter}.\n\t * Do not use inheritance to create custom rendering method, replace `render()` method instead:\n\t *\n\t *\t\tconst myUIElement = new UIElement( 'span' );\n\t *\t\tmyUIElement.render = function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = '<b>this is ui element</b>';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t};\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\trender( domDocument ) {\n\t\treturn this.toDomElement( domDocument );\n\t}\n\n\t/**\n\t * Creates DOM element based on this view UIElement.\n\t * Note that each time this method is called new DOM element is created.\n\t *\n\t * @param {Document} domDocument\n\t * @returns {HTMLElement}\n\t */\n\ttoDomElement( domDocument ) {\n\t\tconst domElement = domDocument.createElement( this.name );\n\n\t\tfor ( const key of this.getAttributeKeys() ) {\n\t\t\tdomElement.setAttribute( key, this.getAttribute( key ) );\n\t\t}\n\n\t\treturn domElement;\n\t}\n}\n\n/**\n * This function injects UI element handling to the given {@link module:engine/view/document~Document document}.\n *\n * A callback is added to {@link module:engine/view/document~Document#event:keydown document keydown event}.\n * The callback handles the situation when right arrow key is pressed and selection is collapsed before a UI element.\n * Without this handler, it would be impossible to \"jump over\" UI element using right arrow key.\n *\n * @param {module:engine/view/view~View} view View controller to which the quirks handling will be injected.\n */\nexport function injectUiElementHandling( view ) {\n\tview.document.on( 'keydown', ( evt, data ) => jumpOverUiElement( evt, data, view.domConverter ) );\n}\n\n// Returns `null` because block filler is not needed for UIElements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n\n// Selection cannot be placed in a `UIElement`. Whenever it is placed there, it is moved before it. This\n// causes a situation when it is impossible to jump over `UIElement` using right arrow key, because the selection\n// ends up in ui element (in DOM) and is moved back to the left. This handler fixes this situation.\nfunction jumpOverUiElement( evt, data, domConverter ) {\n\tif ( data.keyCode == keyCodes.arrowright ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\t\tconst domSelectionCollapsed = domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed;\n\n\t\t// Jump over UI element if selection is collapsed or shift key is pressed. These are the cases when selection would extend.\n\t\tif ( domSelectionCollapsed || data.shiftKey ) {\n\t\t\tconst domParent = domSelection.focusNode;\n\t\t\tconst domOffset = domSelection.focusOffset;\n\n\t\t\tconst viewPosition = domConverter.domPositionToView( domParent, domOffset );\n\n\t\t\t// In case if dom element is not converted to view or is not mapped or something. Happens for example in some tests.\n\t\t\tif ( viewPosition === null ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Skip all following ui elements.\n\t\t\tlet jumpedOverAnyUiElement = false;\n\n\t\t\tconst nextViewPosition = viewPosition.getLastMatchingPosition( value => {\n\t\t\t\tif ( value.item.is( 'uiElement' ) ) {\n\t\t\t\t\t// Remember that there was at least one ui element.\n\t\t\t\t\tjumpedOverAnyUiElement = true;\n\t\t\t\t}\n\n\t\t\t\t// Jump over ui elements, jump over empty attribute elements, move up from inside of attribute element.\n\t\t\t\tif ( value.item.is( 'uiElement' ) || value.item.is( 'attributeElement' ) ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\n\t\t\t\t// Don't jump over text or don't get out of container element.\n\t\t\t\treturn false;\n\t\t\t} );\n\n\t\t\t// If anything has been skipped, fix position.\n\t\t\t// This `if` could be possibly omitted but maybe it is better not to mess with DOM selection if not needed.\n\t\t\tif ( jumpedOverAnyUiElement ) {\n\t\t\t\tconst newDomPosition = domConverter.viewPositionToDom( nextViewPosition );\n\n\t\t\t\tif ( domSelectionCollapsed ) {\n\t\t\t\t\t// Selection was collapsed, so collapse it at further position.\n\t\t\t\t\tdomSelection.collapse( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t} else {\n\t\t\t\t\t// Selection was not collapse, so extend it instead of collapsing.\n\t\t\t\t\tdomSelection.extend( newDomPosition.parent, newDomPosition.offset );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentfragment\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * DocumentFragment class.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates new DocumentFragment instance.\n\t *\n\t * @protected\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children] List of nodes to be inserted into\n\t * created document fragment.\n\t */\n\tconstructor( children ) {\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/element~Element>} module:engine/view/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over nodes added to this document fragment.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of child nodes in this document fragment.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'documentFragment';\n\t}\n\n\t/**\n\t * {@link module:engine/view/documentfragment~DocumentFragment#_insertChild Insert} a child node or a list of child nodes at the end\n\t * and sets the parent of these nodes to this fragment.\n\t *\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this fragment.\n\t *\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Fires `change` event with given type of the change.\n\t *\n\t * @private\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\t}\n}\n\nmix( DocumentFragment, EmitterMixin );\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @returns {Iterable.<module:engine/view/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module module:engine/view/writer\n */\n\nimport Position from './position';\nimport ContainerElement from './containerelement';\nimport AttributeElement from './attributeelement';\nimport EmptyElement from './emptyelement';\nimport UIElement from './uielement';\nimport Range from './range';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport DocumentFragment from './documentfragment';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport isPlainObject from '@ckeditor/ckeditor5-utils/src/lib/lodash/isPlainObject';\nimport Text from './text';\nimport EditableElement from './editableelement';\n\n/**\n * View writer class. Provides set of methods used to properly manipulate nodes attached to\n * {@link module:engine/view/document~Document view document}. It is not recommended to use it directly. To get an instance\n * of view writer associated with the document use {@link module:engine/view/view~View#change view.change()) method.\n */\nexport default class Writer {\n\tconstructor( document ) {\n\t\t/**\n\t\t * @readonly\n\t\t * @type {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = document;\n\n\t\t/**\n\t\t * Holds references to the attribute groups that share the same {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t\t * The keys are `id`s, the values are `Set`s holding {@link module:engine/view/attributeelement~AttributeElement}s.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._cloneGroups = new Map();\n\t}\n\n\t/**\n\t * Sets {@link module:engine/view/documentselection~DocumentSelection selection's} ranges and direction to the\n\t * specified location based on the given {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t * ### Usage:\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets backward selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\twriter.setSelection( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\twriter.setSelection( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\twriter.setSelection( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t * \t\twriter.setSelection( paragraph, 'in' );\n\t *\n\t * Creates a range on the {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'on' );\n\t *\n\t * \t\t// Removes all ranges.\n\t *\t\twriter.setSelection( null );\n\t *\n\t * `Writer#setSelection()` allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\twriter.setSelection( range, { backward: true } );\n\t *\n\t *\t\t// Sets selection as fake.\n\t *\t\t// Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * \t\t// This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * \t\t// represented in other way, for example by applying proper CSS class.\n\t *\t\twriter.setSelection( range, { fake: true } );\n\t *\n\t * \t\t// Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * \t\t// (and be  properly handled by screen readers).\n\t *\t\twriter.setSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetSelection( selectable, placeOrOffset, options ) {\n\t\tthis.document.selection._setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/view/documentselection~DocumentSelection#focus selection's focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/position~Position.createAt} parameters.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetSelectionFocus( itemOrPosition, offset ) {\n\t\tthis.document.selection._setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/view/text~Text text node}.\n\t *\n\t *\t\twriter.createText( 'foo' );\n\t *\n\t * @param {String} data Text data.\n\t * @returns {module:engine/view/text~Text} Created text node.\n\t */\n\tcreateText( data ) {\n\t\treturn new Text( data );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/attributeelement~AttributeElement}.\n\t *\n\t *\t\twriter.createAttributeElement( 'strong' );\n\t *\t\twriter.createAttributeElement( 'strong', { 'alignment': 'center' } );\n\t *\n\t *\t\t// Make `<a>` element contain other attributes element so the `<a>` element is not broken.\n\t *\t\twriter.createAttributeElement( 'a', { href: 'foo.bar' }, { priority: 5 } );\n\t *\n\t *\t\t// Set `id` of a marker element so it is not joined or merged with \"normal\" elements.\n\t *\t\twriter.createAttributeElement( 'span', { class: 'myMarker' }, { id: 'marker:my' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Element's attributes.\n\t * @param {Object} [options] Element's options.\n\t * @param {Number} [options.priority] Element's {@link module:engine/view/attributeelement~AttributeElement#priority priority}.\n\t * @param {Number|String} [options.id] Element's {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t * @returns {module:engine/view/attributeelement~AttributeElement} Created element.\n\t */\n\tcreateAttributeElement( name, attributes, options = {} ) {\n\t\tconst attributeElement = new AttributeElement( name, attributes );\n\n\t\tif ( options.priority ) {\n\t\t\tattributeElement._priority = options.priority;\n\t\t}\n\n\t\tif ( options.id ) {\n\t\t\tattributeElement._id = options.id;\n\t\t}\n\n\t\treturn attributeElement;\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/containerelement~ContainerElement}.\n\t *\n\t *\t\twriter.createContainerElement( 'paragraph' );\n\t *\t\twriter.createContainerElement( 'paragraph', { 'alignment': 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/containerelement~ContainerElement} Created element.\n\t */\n\tcreateContainerElement( name, attributes ) {\n\t\treturn new ContainerElement( name, attributes );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t *\t\twriter.createEditableElement( 'div' );\n\t *\t\twriter.createEditableElement( 'div', { 'alignment': 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/editableelement~EditableElement} Created element.\n\t */\n\tcreateEditableElement( name, attributes ) {\n\t\tconst editableElement = new EditableElement( name, attributes );\n\t\teditableElement._document = this.document;\n\n\t\treturn editableElement;\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/emptyelement~EmptyElement}.\n\t *\n\t *\t\twriter.createEmptyElement( 'img' );\n\t *\t\twriter.createEmptyElement( 'img', { 'alignment': 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/view/emptyelement~EmptyElement} Created element.\n\t */\n\tcreateEmptyElement( name, attributes ) {\n\t\treturn new EmptyElement( name, attributes );\n\t}\n\n\t/**\n\t * Creates new {@link module:engine/view/uielement~UIElement}.\n\t *\n\t *\t\twriter.createUIElement( 'span' );\n\t *\t\twriter.createUIElement( 'span', { 'alignment': 'center' } );\n\t *\n\t * Custom render function can be provided as third parameter:\n\t *\n\t *\t\twriter.createUIElement( 'span', null, function( domDocument ) {\n\t *\t\t\tconst domElement = this.toDomElement( domDocument );\n\t *\t\t\tdomElement.innerHTML = '<b>this is ui element</b>';\n\t *\n\t *\t\t\treturn domElement;\n\t *\t\t} );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {Function} [renderFunction] Custom render function.\n\t * @returns {module:engine/view/uielement~UIElement} Created element.\n\t */\n\tcreateUIElement( name, attributes, renderFunction ) {\n\t\tconst uiElement = new UIElement( name, attributes );\n\n\t\tif ( renderFunction ) {\n\t\t\tuiElement.render = renderFunction;\n\t\t}\n\n\t\treturn uiElement;\n\t}\n\n\t/**\n\t * Adds or overwrite element's attribute with a specified key and value.\n\t *\n\t *\t\twriter.setAttribute( 'href', 'http://ckeditor.com', linkElement );\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetAttribute( key, value, element ) {\n\t\telement._setAttribute( key, value );\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t *\t\twriter.removeAttribute( 'href', linkElement );\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveAttribute( key, element ) {\n\t\telement._removeAttribute( key );\n\t}\n\n\t/**\n\t * Adds specified class to the element.\n\t *\n\t *\t\twriter.addClass( 'foo', linkElement );\n\t *\t\twriter.addClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.<String>|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\taddClass( className, element ) {\n\t\telement._addClass( className );\n\t}\n\n\t/**\n\t * Removes specified class from the element.\n\t *\n\t *\t\twriter.removeClass( 'foo', linkElement );\n\t *\t\twriter.removeClass( [ 'foo', 'bar' ], linkElement );\n\t *\n\t * @param {Array.<String>|String} className\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveClass( className, element ) {\n\t\telement._removeClass( className );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\twriter.setStyle( 'color', 'red', element );\n\t *\t\twriter.setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t}, element );\n\t *\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @param {module:engine/view/element~Element} element Element to set styles on.\n\t */\n\tsetStyle( property, value, element ) {\n\t\tif ( isPlainObject( property ) && element === undefined ) {\n\t\t\telement = value;\n\t\t}\n\n\t\telement._setStyle( property, value );\n\t}\n\n\t/**\n\t * Removes specified style from the element.\n\t *\n\t *\t\twriter.removeStyle( 'color', element );  // Removes 'color' style.\n\t *\t\twriter.removeStyle( [ 'color', 'border-top' ], element ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * @param {Array.<String>|String} property\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tremoveStyle( property, element ) {\n\t\telement._removeStyle( property );\n\t}\n\n\t/**\n\t * Sets a custom property on element. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t * @param {module:engine/view/element~Element} element\n\t */\n\tsetCustomProperty( key, value, element ) {\n\t\telement._setCustomProperty( key, value );\n\t}\n\n\t/**\n\t * Removes a custom property stored under the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @param {module:engine/view/element~Element} element\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\tremoveCustomProperty( key, element ) {\n\t\treturn element._removeCustomProperty( key );\n\t}\n\n\t/**\n\t * Breaks attribute nodes at provided position or at boundaries of provided range. It breaks attribute elements inside\n\t * up to a container element.\n\t *\n\t * In following examples `<p>` is a container, `<b>` and `<u>` are attribute nodes:\n\t *\n\t *        <p>foo<b><u>bar{}</u></b></p> -> <p>foo<b><u>bar</u></b>[]</p>\n\t *        <p>foo<b><u>{}bar</u></b></p> -> <p>foo{}<b><u>bar</u></b></p>\n\t *        <p>foo<b><u>b{}ar</u></b></p> -> <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>\n\t *        <p><b>fo{o</b><u>ba}r</u></p> -> <p><b>fo</b><b>o</b><u>ba</u><u>r</u></b></p>\n\t *\n\t * **Note:** {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n\t *\n\t * **Note:** Difference between {@link module:engine/view/writer~Writer#breakAttributes breakAttributes} and\n\t * {@link module:engine/view/writer~Writer#breakContainer breakContainer} is that `breakAttributes` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer` assumes that given `position` is directly in container element and breaks that container element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container`\n\t * when {@link module:engine/view/range~Range#start start}\n\t * and {@link module:engine/view/range~Range#end end} positions of a passed range are not placed inside same parent container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element`\n\t * when trying to break attributes\n\t * inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element`\n\t * when trying to break attributes\n\t * inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/writer~Writer#breakContainer\n\t * @param {module:engine/view/position~Position|module:engine/view/range~Range} positionOrRange Position where\n\t * to break attribute elements.\n\t * @returns {module:engine/view/position~Position|module:engine/view/range~Range} New position or range, after breaking the attribute\n\t * elements.\n\t */\n\tbreakAttributes( positionOrRange ) {\n\t\tif ( positionOrRange instanceof Position ) {\n\t\t\treturn this._breakAttributes( positionOrRange );\n\t\t} else {\n\t\t\treturn this._breakAttributesRange( positionOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Breaks {@link module:engine/view/containerelement~ContainerElement container view element} into two, at the given position. Position\n\t * has to be directly inside container element and cannot be in root. Does not break if position is at the beginning\n\t * or at the end of it's parent element.\n\t *\n\t *        <p>foo^bar</p> -> <p>foo</p><p>bar</p>\n\t *        <div><p>foo</p>^<p>bar</p></div> -> <div><p>foo</p></div><div><p>bar</p></div>\n\t *        <p>^foobar</p> -> ^<p>foobar</p>\n\t *        <p>foobar^</p> -> <p>foobar</p>^\n\t *\n\t * **Note:** Difference between {@link module:engine/view/writer~Writer#breakAttributes breakAttributes} and\n\t * {@link module:engine/view/writer~Writer#breakContainer breakContainer} is that `breakAttributes` breaks all\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} that are ancestors of given `position`,\n\t * up to the first encountered {@link module:engine/view/containerelement~ContainerElement container element}.\n\t * `breakContainer` assumes that given `position` is directly in container element and breaks that container element.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/writer~Writer#breakAttributes\n\t * @param {module:engine/view/position~Position} position Position where to break element.\n\t * @returns {module:engine/view/position~Position} Position between broken elements. If element has not been broken,\n\t * the returned position is placed either before it or after it.\n\t */\n\tbreakContainer( position ) {\n\t\tconst element = position.parent;\n\n\t\tif ( !( element.is( 'containerElement' ) ) ) {\n\t\t\t/**\n\t\t\t * Trying to break an element which is not a container element.\n\t\t\t *\n\t\t\t * @error view-writer-break-non-container-element\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-writer-break-non-container-element: Trying to break an element which is not a container element.'\n\t\t\t);\n\t\t}\n\n\t\tif ( !element.parent ) {\n\t\t\t/**\n\t\t\t * Trying to break root element.\n\t\t\t *\n\t\t\t * @error view-writer-break-root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-break-root: Trying to break root element.' );\n\t\t}\n\n\t\tif ( position.isAtStart ) {\n\t\t\treturn Position.createBefore( element );\n\t\t} else if ( !position.isAtEnd ) {\n\t\t\tconst newElement = element._clone( false );\n\n\t\t\tthis.insert( Position.createAfter( element ), newElement );\n\n\t\t\tconst sourceRange = new Range( position, Position.createAt( element, 'end' ) );\n\t\t\tconst targetPosition = new Position( newElement, 0 );\n\n\t\t\tthis.move( sourceRange, targetPosition );\n\t\t}\n\n\t\treturn Position.createAfter( element );\n\t}\n\n\t/**\n\t * Merges {@link module:engine/view/attributeelement~AttributeElement attribute elements}. It also merges text nodes if needed.\n\t * Only {@link module:engine/view/attributeelement~AttributeElement#isSimilar similar} attribute elements can be merged.\n\t *\n\t * In following examples `<p>` is a container and `<b>` is an attribute element:\n\t *\n\t *        <p>foo[]bar</p> -> <p>foo{}bar</p>\n\t *        <p><b>foo</b>[]<b>bar</b></p> -> <p><b>foo{}bar</b></p>\n\t *        <p><b foo=\"bar\">a</b>[]<b foo=\"baz\">b</b></p> -> <p><b foo=\"bar\">a</b>[]<b foo=\"baz\">b</b></p>\n\t *\n\t * It will also take care about empty attributes when merging:\n\t *\n\t *        <p><b>[]</b></p> -> <p>[]</p>\n\t *        <p><b>foo</b><i>[]</i><b>bar</b></p> -> <p><b>foo{}bar</b></p>\n\t *\n\t * **Note:** Difference between {@link module:engine/view/writer~Writer#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/writer~Writer#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/writer~Writer#mergeContainers\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeAttributes( position ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// When inside text node - nothing to merge.\n\t\tif ( positionParent.is( 'text' ) ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When inside empty attribute - remove it.\n\t\tif ( positionParent.is( 'attributeElement' ) && positionParent.childCount === 0 ) {\n\t\t\tconst parent = positionParent.parent;\n\t\t\tconst offset = positionParent.index;\n\n\t\t\tpositionParent._remove();\n\t\t\tthis._removeFromClonedElementsGroup( positionParent );\n\n\t\t\treturn this.mergeAttributes( new Position( parent, offset ) );\n\t\t}\n\n\t\tconst nodeBefore = positionParent.getChild( positionOffset - 1 );\n\t\tconst nodeAfter = positionParent.getChild( positionOffset );\n\n\t\t// Position should be placed between two nodes.\n\t\tif ( !nodeBefore || !nodeAfter ) {\n\t\t\treturn position;\n\t\t}\n\n\t\t// When position is between two text nodes.\n\t\tif ( nodeBefore.is( 'text' ) && nodeAfter.is( 'text' ) ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\t\t// When position is between two same attribute elements.\n\t\telse if ( nodeBefore.is( 'attributeElement' ) && nodeAfter.is( 'attributeElement' ) && nodeBefore.isSimilar( nodeAfter ) ) {\n\t\t\t// Move all children nodes from node placed after selection and remove that node.\n\t\t\tconst count = nodeBefore.childCount;\n\t\t\tnodeBefore._appendChild( nodeAfter.getChildren() );\n\n\t\t\tnodeAfter._remove();\n\t\t\tthis._removeFromClonedElementsGroup( nodeAfter );\n\n\t\t\t// New position is located inside the first node, before new nodes.\n\t\t\t// Call this method recursively to merge again if needed.\n\t\t\treturn this.mergeAttributes( new Position( nodeBefore, count ) );\n\t\t}\n\n\t\treturn position;\n\t}\n\n\t/**\n\t * Merges two {@link module:engine/view/containerelement~ContainerElement container elements} that are before and after given position.\n\t * Precisely, the element after the position is removed and it's contents are moved to element before the position.\n\t *\n\t *        <p>foo</p>^<p>bar</p> -> <p>foo^bar</p>\n\t *        <div>foo</div>^<p>bar</p> -> <div>foo^bar</div>\n\t *\n\t * **Note:** Difference between {@link module:engine/view/writer~Writer#mergeAttributes mergeAttributes} and\n\t * {@link module:engine/view/writer~Writer#mergeContainers mergeContainers} is that `mergeAttributes` merges two\n\t * {@link module:engine/view/attributeelement~AttributeElement attribute elements} or {@link module:engine/view/text~Text text nodes}\n\t * while `mergeContainer` merges two {@link module:engine/view/containerelement~ContainerElement container elements}.\n\t *\n\t * @see module:engine/view/attributeelement~AttributeElement\n\t * @see module:engine/view/containerelement~ContainerElement\n\t * @see module:engine/view/writer~Writer#mergeAttributes\n\t * @param {module:engine/view/position~Position} position Merge position.\n\t * @returns {module:engine/view/position~Position} Position after merge.\n\t */\n\tmergeContainers( position ) {\n\t\tconst prev = position.nodeBefore;\n\t\tconst next = position.nodeAfter;\n\n\t\tif ( !prev || !next || !prev.is( 'containerElement' ) || !next.is( 'containerElement' ) ) {\n\t\t\t/**\n\t\t\t * Element before and after given position cannot be merged.\n\t\t\t *\n\t\t\t * @error view-writer-merge-containers-invalid-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-merge-containers-invalid-position: ' +\n\t\t\t\t'Element before and after given position cannot be merged.' );\n\t\t}\n\n\t\tconst lastChild = prev.getChild( prev.childCount - 1 );\n\t\tconst newPosition = lastChild instanceof Text ? Position.createAt( lastChild, 'end' ) : Position.createAt( prev, 'end' );\n\n\t\tthis.move( Range.createIn( next ), Position.createAt( prev, 'end' ) );\n\t\tthis.remove( Range.createOn( next ) );\n\n\t\treturn newPosition;\n\t}\n\n\t/**\n\t * Insert node or nodes at specified position. Takes care about breaking attributes before insertion\n\t * and merging them afterwards.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n\t * contains instances that are not {@link module:engine/view/text~Text Texts},\n\t * {@link module:engine/view/attributeelement~AttributeElement AttributeElements},\n\t * {@link module:engine/view/containerelement~ContainerElement ContainerElements},\n\t * {@link module:engine/view/emptyelement~EmptyElement EmptyElements} or\n\t * {@link module:engine/view/uielement~UIElement UIElements}.\n\t *\n\t * @param {module:engine/view/position~Position} position Insertion position.\n\t * @param {module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement|\n\t * module:engine/view/containerelement~ContainerElement|module:engine/view/emptyelement~EmptyElement|\n\t * module:engine/view/uielement~UIElement|Iterable.<module:engine/view/text~Text|\n\t * module:engine/view/attributeelement~AttributeElement|module:engine/view/containerelement~ContainerElement|\n\t * module:engine/view/emptyelement~EmptyElement|module:engine/view/uielement~UIElement>} nodes Node or nodes to insert.\n\t * @returns {module:engine/view/range~Range} Range around inserted nodes.\n\t */\n\tinsert( position, nodes ) {\n\t\tnodes = isIterable( nodes ) ? [ ...nodes ] : [ nodes ];\n\n\t\t// Check if nodes to insert are instances of AttributeElements, ContainerElements, EmptyElements, UIElements or Text.\n\t\tvalidateNodesToInsert( nodes );\n\n\t\tconst container = getParentContainer( position );\n\n\t\tif ( !container ) {\n\t\t\t/**\n\t\t\t * Position's parent container cannot be found.\n\t\t\t *\n\t\t\t * @error view-writer-invalid-position-container\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-invalid-position-container' );\n\t\t}\n\n\t\tconst insertionPosition = this._breakAttributes( position, true );\n\t\tconst length = container._insertChild( insertionPosition.offset, nodes );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tthis._addToClonedElementsGroup( node );\n\t\t}\n\n\t\tconst endPosition = insertionPosition.getShiftedBy( length );\n\t\tconst start = this.mergeAttributes( insertionPosition );\n\n\t\t// When no nodes were inserted - return collapsed range.\n\t\tif ( length === 0 ) {\n\t\t\treturn new Range( start, start );\n\t\t} else {\n\t\t\t// If start position was merged - move end position.\n\t\t\tif ( !start.isEqual( insertionPosition ) ) {\n\t\t\t\tendPosition.offset--;\n\t\t\t}\n\n\t\t\tconst end = this.mergeAttributes( endPosition );\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\t}\n\n\t/**\n\t * Removes provided range from the container.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to remove from container. After removing, it will be updated\n\t * to a collapsed range showing the new position.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} Document fragment containing removed nodes.\n\t */\n\tremove( range ) {\n\t\tvalidateRangeContainer( range );\n\n\t\t// If range is collapsed - nothing to remove.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn new DocumentFragment();\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\t\tconst parentContainer = breakStart.parent;\n\n\t\tconst count = breakEnd.offset - breakStart.offset;\n\n\t\t// Remove nodes in range.\n\t\tconst removed = parentContainer._removeChildren( breakStart.offset, count );\n\n\t\tfor ( const node of removed ) {\n\t\t\tthis._removeFromClonedElementsGroup( node );\n\t\t}\n\n\t\t// Merge after removing.\n\t\tconst mergePosition = this.mergeAttributes( breakStart );\n\t\trange.start = mergePosition;\n\t\trange.end = Position.createFromPosition( mergePosition );\n\n\t\t// Return removed nodes.\n\t\treturn new DocumentFragment( removed );\n\t}\n\n\t/**\n\t * Removes matching elements from given range.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to clear.\n\t * @param {module:engine/view/element~Element} element Element to remove.\n\t */\n\tclear( range, element ) {\n\t\tvalidateRangeContainer( range );\n\n\t\t// Create walker on given range.\n\t\t// We walk backward because when we remove element during walk it modifies range end position.\n\t\tconst walker = range.getWalker( {\n\t\t\tdirection: 'backward',\n\t\t\tignoreElementEnd: true\n\t\t} );\n\n\t\t// Let's walk.\n\t\tfor ( const current of walker ) {\n\t\t\tconst item = current.item;\n\t\t\tlet rangeToRemove;\n\n\t\t\t// When current item matches to the given element.\n\t\t\tif ( item.is( 'element' ) && element.isSimilar( item ) ) {\n\t\t\t\t// Create range on this element.\n\t\t\t\trangeToRemove = Range.createOn( item );\n\t\t\t\t// When range starts inside Text or TextProxy element.\n\t\t\t} else if ( !current.nextPosition.isAfter( range.start ) && item.is( 'textProxy' ) ) {\n\t\t\t\t// We need to check if parent of this text matches to given element.\n\t\t\t\tconst parentElement = item.getAncestors().find( ancestor => {\n\t\t\t\t\treturn ancestor.is( 'element' ) && element.isSimilar( ancestor );\n\t\t\t\t} );\n\n\t\t\t\t// If it is then create range inside this element.\n\t\t\t\tif ( parentElement ) {\n\t\t\t\t\trangeToRemove = Range.createIn( parentElement );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we have found element to remove.\n\t\t\tif ( rangeToRemove ) {\n\t\t\t\t// We need to check if element range stick out of the given range and truncate if it is.\n\t\t\t\tif ( rangeToRemove.end.isAfter( range.end ) ) {\n\t\t\t\t\trangeToRemove.end = range.end;\n\t\t\t\t}\n\n\t\t\t\tif ( rangeToRemove.start.isBefore( range.start ) ) {\n\t\t\t\t\trangeToRemove.start = range.start;\n\t\t\t\t}\n\n\t\t\t\t// At the end we remove range with found element.\n\t\t\t\tthis.remove( rangeToRemove );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Moves nodes from provided range to target position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} sourceRange Range containing nodes to move.\n\t * @param {module:engine/view/position~Position} targetPosition Position to insert.\n\t * @returns {module:engine/view/range~Range} Range in target container. Inserted nodes are placed between\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions.\n\t */\n\tmove( sourceRange, targetPosition ) {\n\t\tlet nodes;\n\n\t\tif ( targetPosition.isAfter( sourceRange.end ) ) {\n\t\t\ttargetPosition = this._breakAttributes( targetPosition, true );\n\n\t\t\tconst parent = targetPosition.parent;\n\t\t\tconst countBefore = parent.childCount;\n\n\t\t\tsourceRange = this._breakAttributesRange( sourceRange, true );\n\n\t\t\tnodes = this.remove( sourceRange );\n\n\t\t\ttargetPosition.offset += ( parent.childCount - countBefore );\n\t\t} else {\n\t\t\tnodes = this.remove( sourceRange );\n\t\t}\n\n\t\treturn this.insert( targetPosition, nodes );\n\t}\n\n\t/**\n     * Wraps elements within range with provided {@link module:engine/view/attributeelement~AttributeElement AttributeElement}.\n     * If a collapsed range is provided, it will be wrapped only if it is equal to view selection.\n     *\n     * If a collapsed range was passed and is same as selection, the selection\n     * will be moved to the inside of the wrapped attribute element.\n     *\n     * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-invalid-range-container`\n     * when {@link module:engine/view/range~Range#start}\n     * and {@link module:engine/view/range~Range#end} positions are not placed inside same parent container.\n     *\n     * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n     * an instance of {module:engine/view/attributeelement~AttributeElement AttributeElement}.\n     *\n     * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-nonselection-collapsed-range` when passed range\n     * is collapsed and different than view selection.\n     *\n     * @param {module:engine/view/range~Range} range Range to wrap.\n     * @param {module:engine/view/attributeelement~AttributeElement} attribute Attribute element to use as wrapper.\n     * @returns {module:engine/view/range~Range} range Range after wrapping, spanning over wrapping attribute element.\n    */\n\twrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\tthrow new CKEditorError( 'view-writer-wrap-invalid-attribute' );\n\t\t}\n\n\t\tvalidateRangeContainer( range );\n\n\t\tif ( !range.isCollapsed ) {\n\t\t\t// Non-collapsed range. Wrap it with the attribute element.\n\t\t\treturn this._wrapRange( range, attribute );\n\t\t} else {\n\t\t\t// Collapsed range. Wrap position.\n\t\t\tlet position = range.start;\n\n\t\t\tif ( position.parent.is( 'element' ) && !_hasNonUiChildren( position.parent ) ) {\n\t\t\t\tposition = position.getLastMatchingPosition( value => value.item.is( 'uiElement' ) );\n\t\t\t}\n\n\t\t\tposition = this._wrapPosition( position, attribute );\n\t\t\tconst viewSelection = this.document.selection;\n\n\t\t\t// If wrapping position is equal to view selection, move view selection inside wrapping attribute element.\n\t\t\tif ( viewSelection.isCollapsed && viewSelection.getFirstPosition().isEqual( range.start ) ) {\n\t\t\t\tthis.setSelection( position );\n\t\t\t}\n\n\t\t\treturn new Range( position );\n\t\t}\n\t}\n\n\t/**\n\t * Unwraps nodes within provided range from attribute element.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when\n\t * {@link module:engine/view/range~Range#start start} and {@link module:engine/view/range~Range#end end} positions are not placed inside\n\t * same parent container.\n\t *\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t */\n\tunwrap( range, attribute ) {\n\t\tif ( !( attribute instanceof AttributeElement ) ) {\n\t\t\t/**\n\t\t\t * Attribute element need to be instance of attribute element.\n\t\t\t *\n\t\t\t * @error view-writer-unwrap-invalid-attribute\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-unwrap-invalid-attribute' );\n\t\t}\n\n\t\tvalidateRangeContainer( range );\n\n\t\t// If range is collapsed - nothing to unwrap.\n\t\tif ( range.isCollapsed ) {\n\t\t\treturn range;\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\n\t\t// Range around one element - check if AttributeElement can be unwrapped partially when it's not similar.\n\t\t// For example:\n\t\t// <b class=\"foo bar\" title=\"baz\"></b> unwrap with:\t<b class=\"foo\"></p> result: <b class\"bar\" title=\"baz\"></b>\n\t\tif ( breakEnd.isEqual( breakStart.getShiftedBy( 1 ) ) ) {\n\t\t\tconst node = breakStart.nodeAfter;\n\n\t\t\t// Unwrap single attribute element.\n\t\t\tif ( !attribute.isSimilar( node ) && node instanceof AttributeElement && this._unwrapAttributeElement( attribute, node ) ) {\n\t\t\t\tconst start = this.mergeAttributes( breakStart );\n\n\t\t\t\tif ( !start.isEqual( breakStart ) ) {\n\t\t\t\t\tbreakEnd.offset--;\n\t\t\t\t}\n\n\t\t\t\tconst end = this.mergeAttributes( breakEnd );\n\n\t\t\t\treturn new Range( start, end );\n\t\t\t}\n\t\t}\n\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Unwrap children located between break points.\n\t\tconst newRange = this._unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Renames element by creating a copy of renamed element but with changed name and then moving contents of the\n\t * old element to the new one. Keep in mind that this will invalidate all {@link module:engine/view/position~Position positions} which\n\t * has renamed element as {@link module:engine/view/position~Position#parent a parent}.\n\t *\n\t * New element has to be created because `Element#tagName` property in DOM is readonly.\n\t *\n\t * Since this function creates a new element and removes the given one, the new element is returned to keep reference.\n\t *\n\t * @param {module:engine/view/containerelement~ContainerElement} viewElement Element to be renamed.\n\t * @param {String} newName New name for element.\n\t */\n\trename( viewElement, newName ) {\n\t\tconst newElement = new ContainerElement( newName, viewElement.getAttributes() );\n\n\t\tthis.insert( Position.createAfter( viewElement ), newElement );\n\t\tthis.move( Range.createIn( viewElement ), Position.createAt( newElement ) );\n\t\tthis.remove( Range.createOn( viewElement ) );\n\n\t\treturn newElement;\n\t}\n\n\t/**\n\t * Wraps children with provided `attribute`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be wrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} attribute\n\t */\n\t_wrapChildren( parent, startOffset, endOffset, attribute ) {\n\t\tlet i = startOffset;\n\t\tconst wrapPositions = [];\n\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\t\t\tconst isText = child.is( 'text' );\n\t\t\tconst isAttribute = child.is( 'attributeElement' );\n\t\t\tconst isEmpty = child.is( 'emptyElement' );\n\t\t\tconst isUI = child.is( 'uiElement' );\n\n\t\t\t// Wrap text, empty elements, ui elements or attributes with higher or equal priority.\n\t\t\tif ( isText || isEmpty || isUI || ( isAttribute && shouldABeOutsideB( attribute, child ) ) ) {\n\t\t\t\t// Clone attribute.\n\t\t\t\tconst newAttribute = attribute._clone();\n\n\t\t\t\t// Wrap current node with new attribute.\n\t\t\t\tchild._remove();\n\t\t\t\tnewAttribute._appendChild( child );\n\n\t\t\t\tparent._insertChild( i, newAttribute );\n\t\t\t\tthis._addToClonedElementsGroup( newAttribute );\n\n\t\t\t\twrapPositions.push(\tnew Position( parent, i ) );\n\t\t\t}\n\t\t\t// If other nested attribute is found start wrapping there.\n\t\t\telse if ( isAttribute ) {\n\t\t\t\tthis._wrapChildren( child, 0, child.childCount, attribute );\n\t\t\t}\n\n\t\t\ti++;\n\t\t}\n\n\t\t// Merge at each wrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of wrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range.createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Unwraps children from provided `attribute`. Only children contained in `parent` element between\n\t * `startOffset` and `endOffset` will be unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} parent\n\t * @param {Number} startOffset\n\t * @param {Number} endOffset\n\t * @param {module:engine/view/element~Element} attribute\n\t */\n\t_unwrapChildren( parent, startOffset, endOffset, attribute ) {\n\t\tlet i = startOffset;\n\t\tconst unwrapPositions = [];\n\n\t\t// Iterate over each element between provided offsets inside parent.\n\t\twhile ( i < endOffset ) {\n\t\t\tconst child = parent.getChild( i );\n\n\t\t\t// If attributes are the similar, then unwrap.\n\t\t\tif ( child.isSimilar( attribute ) ) {\n\t\t\t\tconst unwrapped = child.getChildren();\n\t\t\t\tconst count = child.childCount;\n\n\t\t\t\t// Replace wrapper element with its children\n\t\t\t\tchild._remove();\n\t\t\t\tparent._insertChild( i, unwrapped );\n\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\n\t\t\t\t// Save start and end position of moved items.\n\t\t\t\tunwrapPositions.push(\n\t\t\t\t\tnew Position( parent, i ),\n\t\t\t\t\tnew Position( parent, i + count )\n\t\t\t\t);\n\n\t\t\t\t// Skip elements that were unwrapped. Assuming that there won't be another element to unwrap in child\n\t\t\t\t// elements.\n\t\t\t\ti += count;\n\t\t\t\tendOffset += count - 1;\n\t\t\t} else {\n\t\t\t\t// If other nested attribute is found start unwrapping there.\n\t\t\t\tif ( child.is( 'attributeElement' ) ) {\n\t\t\t\t\tthis._unwrapChildren( child, 0, child.childCount, attribute );\n\t\t\t\t}\n\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Merge at each unwrap.\n\t\tlet offsetChange = 0;\n\n\t\tfor ( const position of unwrapPositions ) {\n\t\t\tposition.offset -= offsetChange;\n\n\t\t\t// Do not merge with elements outside selected children.\n\t\t\tif ( position.offset == startOffset || position.offset == endOffset ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst newPosition = this.mergeAttributes( position );\n\n\t\t\t// If nodes were merged - other merge offsets will change.\n\t\t\tif ( !newPosition.isEqual( position ) ) {\n\t\t\t\toffsetChange++;\n\t\t\t\tendOffset--;\n\t\t\t}\n\t\t}\n\n\t\treturn Range.createFromParentsAndOffsets( parent, startOffset, parent, endOffset );\n\t}\n\n\t/**\n\t * Helper function for `view.writer.wrap`. Wraps range with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/range~Range} New range after wrapping, spanning over wrapping attribute element.\n\t */\n\t_wrapRange( range, attribute ) {\n\t\t// Range is inside single attribute and spans on all children.\n\t\tif ( rangeSpansOnAllChildren( range ) && this._wrapAttributeElement( attribute, range.start.parent ) ) {\n\t\t\tconst parent = range.start.parent;\n\n\t\t\tconst end = this.mergeAttributes( Position.createAfter( parent ) );\n\t\t\tconst start = this.mergeAttributes( Position.createBefore( parent ) );\n\n\t\t\treturn new Range( start, end );\n\t\t}\n\n\t\t// Break attributes at range start and end.\n\t\tconst { start: breakStart, end: breakEnd } = this._breakAttributesRange( range, true );\n\n\t\t// Range around one element.\n\t\tif ( breakEnd.isEqual( breakStart.getShiftedBy( 1 ) ) ) {\n\t\t\tconst node = breakStart.nodeAfter;\n\n\t\t\tif ( node instanceof AttributeElement && this._wrapAttributeElement( attribute, node ) ) {\n\t\t\t\tconst start = this.mergeAttributes( breakStart );\n\n\t\t\t\tif ( !start.isEqual( breakStart ) ) {\n\t\t\t\t\tbreakEnd.offset--;\n\t\t\t\t}\n\n\t\t\t\tconst end = this.mergeAttributes( breakEnd );\n\n\t\t\t\treturn new Range( start, end );\n\t\t\t}\n\t\t}\n\n\t\tconst parentContainer = breakStart.parent;\n\n\t\t// Unwrap children located between break points.\n\t\tconst unwrappedRange = this._unwrapChildren( parentContainer, breakStart.offset, breakEnd.offset, attribute );\n\n\t\t// Wrap all children with attribute.\n\t\tconst newRange = this._wrapChildren( parentContainer, unwrappedRange.start.offset, unwrappedRange.end.offset, attribute );\n\n\t\t// Merge attributes at the both ends and return a new range.\n\t\tconst start = this.mergeAttributes( newRange.start );\n\n\t\t// If start position was merged - move end position back.\n\t\tif ( !start.isEqual( newRange.start ) ) {\n\t\t\tnewRange.end.offset--;\n\t\t}\n\t\tconst end = this.mergeAttributes( newRange.end );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Helper function for {@link #wrap}. Wraps position with provided attribute element.\n\t * This method will also merge newly added attribute element with its siblings whenever possible.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError} `view-writer-wrap-invalid-attribute` when passed attribute element is not\n\t * an instance of {module:engine/view/attributeelement~AttributeElement AttributeElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position\n\t * @param {module:engine/view/attributeelement~AttributeElement} attribute\n\t * @returns {module:engine/view/position~Position} New position after wrapping.\n\t */\n\t_wrapPosition( position, attribute ) {\n\t\t// Return same position when trying to wrap with attribute similar to position parent.\n\t\tif ( attribute.isSimilar( position.parent ) ) {\n\t\t\treturn movePositionToTextNode( Position.createFromPosition( position ) );\n\t\t}\n\n\t\t// When position is inside text node - break it and place new position between two text nodes.\n\t\tif ( position.parent.is( 'text' ) ) {\n\t\t\tposition = breakTextNode( position );\n\t\t}\n\n\t\t// Create fake element that will represent position, and will not be merged with other attributes.\n\t\tconst fakePosition = this.createAttributeElement();\n\t\tfakePosition._priority = Number.POSITIVE_INFINITY;\n\t\tfakePosition.isSimilar = () => false;\n\n\t\t// Insert fake element in position location.\n\t\tposition.parent._insertChild( position.offset, fakePosition );\n\n\t\t// Range around inserted fake attribute element.\n\t\tconst wrapRange = new Range( position, position.getShiftedBy( 1 ) );\n\n\t\t// Wrap fake element with attribute (it will also merge if possible).\n\t\tthis.wrap( wrapRange, attribute );\n\n\t\t// Remove fake element and place new position there.\n\t\tconst newPosition = new Position( fakePosition.parent, fakePosition.index );\n\t\tfakePosition._remove();\n\n\t\t// If position is placed between text nodes - merge them and return position inside.\n\t\tconst nodeBefore = newPosition.nodeBefore;\n\t\tconst nodeAfter = newPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof Text && nodeAfter instanceof Text ) {\n\t\t\treturn mergeTextNodes( nodeBefore, nodeAfter );\n\t\t}\n\n\t\t// If position is next to text node - move position inside.\n\t\treturn movePositionToTextNode( newPosition );\n\t}\n\n\t/**\n\t * \tWraps one {@link module:engine/view/attributeelement~AttributeElement AttributeElement} into another by\n\t * \tmerging them if possible. When merging is possible - all attributes, styles and classes are moved from wrapper\n\t * \telement to element being wrapped.\n\t *\n\t * \t@private\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * \t@param {module:engine/view/attributeelement~AttributeElement} toWrap AttributeElement to wrap using wrapper element.\n\t * \t@returns {Boolean} Returns `true` if elements are merged.\n\t */\n\t_wrapAttributeElement( wrapper, toWrap ) {\n\t\tif ( !canBeJoined( wrapper, toWrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't merge if name or priority differs.\n\t\tif ( wrapper.name !== toWrap.name || wrapper.priority !== toWrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes can be merged.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are different we cannot wrap.\n\t\t\tif ( toWrap.hasAttribute( key ) && toWrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles can be merged.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( toWrap.hasStyle( key ) && toWrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Move all attributes/classes/styles from wrapper to wrapped AttributeElement.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// Move only these attributes that are not present - other are similar.\n\t\t\tif ( !toWrap.hasAttribute( key ) ) {\n\t\t\t\tthis.setAttribute( key, wrapper.getAttribute( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\tif ( !toWrap.hasStyle( key ) ) {\n\t\t\t\tthis.setStyle( key, wrapper.getStyle( key ), toWrap );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of wrapper.getClassNames() ) {\n\t\t\tif ( !toWrap.hasClass( key ) ) {\n\t\t\t\tthis.addClass( key, toWrap );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Unwraps {@link module:engine/view/attributeelement~AttributeElement AttributeElement} from another by removing\n\t * corresponding attributes, classes and styles. All attributes, classes and styles from wrapper should be present\n\t * inside element being unwrapped.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} wrapper Wrapper AttributeElement.\n\t * @param {module:engine/view/attributeelement~AttributeElement} toUnwrap AttributeElement to unwrap using wrapper element.\n\t * @returns {Boolean} Returns `true` if elements are unwrapped.\n\t **/\n\t_unwrapAttributeElement( wrapper, toUnwrap ) {\n\t\tif ( !canBeJoined( wrapper, toUnwrap ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Can't unwrap if name or priority differs.\n\t\tif ( wrapper.name !== toUnwrap.name || wrapper.priority !== toUnwrap.priority ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper attributes.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// If some attributes are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasAttribute( key ) || toUnwrap.getAttribute( key ) !== wrapper.getAttribute( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper classes.\n\t\tif ( !toUnwrap.hasClass( ...wrapper.getClassNames() ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if AttributeElement has all wrapper styles.\n\t\tfor ( const key of wrapper.getStyleNames() ) {\n\t\t\t// If some styles are missing or different we cannot unwrap.\n\t\t\tif ( !toUnwrap.hasStyle( key ) || toUnwrap.getStyle( key ) !== wrapper.getStyle( key ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Remove all wrapper's attributes from unwrapped element.\n\t\tfor ( const key of wrapper.getAttributeKeys() ) {\n\t\t\t// Classes and styles should be checked separately.\n\t\t\tif ( key === 'class' || key === 'style' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tthis.removeAttribute( key, toUnwrap );\n\t\t}\n\n\t\t// Remove all wrapper's classes from unwrapped element.\n\t\tthis.removeClass( Array.from( wrapper.getClassNames() ), toUnwrap );\n\n\t\t// Remove all wrapper's styles from unwrapped element.\n\t\tthis.removeStyle( Array.from( wrapper.getStyleNames() ), toUnwrap );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper function used by other `Writer` methods. Breaks attribute elements at the boundaries of given range.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range Range which `start` and `end` positions will be used to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/range~Range} New range with located at break positions.\n\t */\n\t_breakAttributesRange( range, forceSplitText = false ) {\n\t\tconst rangeStart = range.start;\n\t\tconst rangeEnd = range.end;\n\n\t\tvalidateRangeContainer( range );\n\n\t\t// Break at the collapsed position. Return new collapsed range.\n\t\tif ( range.isCollapsed ) {\n\t\t\tconst position = this._breakAttributes( range.start, forceSplitText );\n\n\t\t\treturn new Range( position, position );\n\t\t}\n\n\t\tconst breakEnd = this._breakAttributes( rangeEnd, forceSplitText );\n\t\tconst count = breakEnd.parent.childCount;\n\t\tconst breakStart = this._breakAttributes( rangeStart, forceSplitText );\n\n\t\t// Calculate new break end offset.\n\t\tbreakEnd.offset += breakEnd.parent.childCount - count;\n\n\t\treturn new Range( breakStart, breakEnd );\n\t}\n\n\t/**\n\t * Helper function used by other `Writer` methods. Breaks attribute elements at given position.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-empty-element` when break position\n\t * is placed inside {@link module:engine/view/emptyelement~EmptyElement EmptyElement}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-cannot-break-ui-element` when break position\n\t * is placed inside {@link module:engine/view/uielement~UIElement UIElement}.\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} position Position where to break attributes.\n\t * @param {Boolean} [forceSplitText=false] If set to `true`, will break text nodes even if they are directly in container element.\n\t * This behavior will result in incorrect view state, but is needed by other view writing methods which then fixes view state.\n\t * @returns {module:engine/view/position~Position} New position after breaking the attributes.\n\t */\n\t_breakAttributes( position, forceSplitText = false ) {\n\t\tconst positionOffset = position.offset;\n\t\tconst positionParent = position.parent;\n\n\t\t// If position is placed inside EmptyElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'emptyElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break inside EmptyElement instance.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-empty-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-empty-element' );\n\t\t}\n\n\t\t// If position is placed inside UIElement - throw an exception as we cannot break inside.\n\t\tif ( position.parent.is( 'uiElement' ) ) {\n\t\t\t/**\n\t\t\t * Cannot break inside UIElement instance.\n\t\t\t *\n\t\t\t * @error view-writer-cannot-break-ui-element\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-cannot-break-ui-element' );\n\t\t}\n\n\t\t// There are no attributes to break and text nodes breaking is not forced.\n\t\tif ( !forceSplitText && positionParent.is( 'text' ) && isContainerOrFragment( positionParent.parent ) ) {\n\t\t\treturn Position.createFromPosition( position );\n\t\t}\n\n\t\t// Position's parent is container, so no attributes to break.\n\t\tif ( isContainerOrFragment( positionParent ) ) {\n\t\t\treturn Position.createFromPosition( position );\n\t\t}\n\n\t\t// Break text and start again in new position.\n\t\tif ( positionParent.is( 'text' ) ) {\n\t\t\treturn this._breakAttributes( breakTextNode( position ), forceSplitText );\n\t\t}\n\n\t\tconst length = positionParent.childCount;\n\n\t\t// <p>foo<b><u>bar{}</u></b></p>\n\t\t// <p>foo<b><u>bar</u>[]</b></p>\n\t\t// <p>foo<b><u>bar</u></b>[]</p>\n\t\tif ( positionOffset == length ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index + 1 );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t} else\n\t\t// <p>foo<b><u>{}bar</u></b></p>\n\t\t// <p>foo<b>[]<u>bar</u></b></p>\n\t\t// <p>foo{}<b><u>bar</u></b></p>\n\t\tif ( positionOffset === 0 ) {\n\t\t\tconst newPosition = new Position( positionParent.parent, positionParent.index );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t}\n\t\t// <p>foo<b><u>b{}ar</u></b></p>\n\t\t// <p>foo<b><u>b[]ar</u></b></p>\n\t\t// <p>foo<b><u>b</u>[]<u>ar</u></b></p>\n\t\t// <p>foo<b><u>b</u></b>[]<b><u>ar</u></b></p>\n\t\telse {\n\t\t\tconst offsetAfter = positionParent.index + 1;\n\n\t\t\t// Break element.\n\t\t\tconst clonedNode = positionParent._clone();\n\n\t\t\t// Insert cloned node to position's parent node.\n\t\t\tpositionParent.parent._insertChild( offsetAfter, clonedNode );\n\t\t\tthis._addToClonedElementsGroup( clonedNode );\n\n\t\t\t// Get nodes to move.\n\t\t\tconst count = positionParent.childCount - positionOffset;\n\t\t\tconst nodesToMove = positionParent._removeChildren( positionOffset, count );\n\n\t\t\t// Move nodes to cloned node.\n\t\t\tclonedNode._appendChild( nodesToMove );\n\n\t\t\t// Create new position to work on.\n\t\t\tconst newPosition = new Position( positionParent.parent, offsetAfter );\n\n\t\t\treturn this._breakAttributes( newPosition, forceSplitText );\n\t\t}\n\t}\n\n\t/**\n\t * Stores the information that an {@link module:engine/view/attributeelement~AttributeElement attribute element} was\n\t * added to the tree. Saves the reference to the group in the given element and updates the group, so other elements\n\t * from the group now keep a reference to the given attribute element.\n\t *\n\t * The clones group can be obtained using {@link module:engine/view/attributeelement~AttributeElement#getElementsWithSameId}.\n\t *\n\t * Does nothing if added element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to save.\n\t */\n\t_addToClonedElementsGroup( element ) {\n\t\t// Add only if the element is in document tree.\n\t\tif ( !element.root.is( 'rootElement' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Traverse the element's children recursively to find other attribute elements that also might got inserted.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._addToClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tlet group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\tgroup = new Set();\n\t\t\tthis._cloneGroups.set( id, group );\n\t\t}\n\n\t\tgroup.add( element );\n\t\telement._clonesGroup = group;\n\t}\n\n\t/**\n\t * Removes all the information about the given {@link module:engine/view/attributeelement~AttributeElement attribute element}\n\t * from its clones group.\n\t *\n\t * Keep in mind, that the element will still keep a reference to the group (but the group will not keep a reference to it).\n\t * This allows to reference the whole group even if the element was already removed from the tree.\n\t *\n\t * Does nothing if the element has no {@link module:engine/view/attributeelement~AttributeElement#id id}.\n\t *\n\t * @private\n\t * @param {module:engine/view/attributeelement~AttributeElement} element Attribute element to remove.\n\t */\n\t_removeFromClonedElementsGroup( element ) {\n\t\t// Traverse the element's children recursively to find other attribute elements that also got removed.\n\t\t// The loop is at the beginning so we can make fast returns later in the code.\n\t\tif ( element.is( 'element' ) ) {\n\t\t\tfor ( const child of element.getChildren() ) {\n\t\t\t\tthis._removeFromClonedElementsGroup( child );\n\t\t\t}\n\t\t}\n\n\t\tconst id = element.id;\n\n\t\tif ( !id ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst group = this._cloneGroups.get( id );\n\n\t\tif ( !group ) {\n\t\t\treturn;\n\t\t}\n\n\t\tgroup.delete( element );\n\t\t// Not removing group from element on purpose!\n\t\t// If other parts of code have reference to this element, they will be able to get references to other elements from the group.\n\t\t// If all other elements are removed from the set, everything will be garbage collected.\n\n\t\tif ( group.size === 0 ) {\n\t\t\tthis._cloneGroups.delete( id );\n\t\t}\n\t}\n}\n\n// Helper function for `view.writer.wrap`. Checks if given element has any children that are not ui elements.\nfunction _hasNonUiChildren( parent ) {\n\treturn Array.from( parent.getChildren() ).some( child => !child.is( 'uiElement' ) );\n}\n\n/**\n * Attribute element need to be instance of attribute element.\n *\n * @error view-writer-wrap-invalid-attribute\n */\n\n// Returns first parent container of specified {@link module:engine/view/position~Position Position}.\n// Position's parent node is checked as first, then next parents are checked.\n// Note that {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment} is treated like a container.\n//\n// @param {module:engine/view/position~Position} position Position used as a start point to locate parent container.\n// @returns {module:engine/view/containerelement~ContainerElement|module:engine/view/documentfragment~DocumentFragment|undefined}\n// Parent container element or `undefined` if container is not found.\nfunction getParentContainer( position ) {\n\tlet parent = position.parent;\n\n\twhile ( !isContainerOrFragment( parent ) ) {\n\t\tif ( !parent ) {\n\t\t\treturn undefined;\n\t\t}\n\t\tparent = parent.parent;\n\t}\n\n\treturn parent;\n}\n\n// Checks if first {@link module:engine/view/attributeelement~AttributeElement AttributeElement} provided to the function\n// can be wrapped otuside second element. It is done by comparing elements'\n// {@link module:engine/view/attributeelement~AttributeElement#priority priorities}, if both have same priority\n// {@link module:engine/view/element~Element#getIdentity identities} are compared.\n//\n// @param {module:engine/view/attributeelement~AttributeElement} a\n// @param {module:engine/view/attributeelement~AttributeElement} b\n// @returns {Boolean}\nfunction shouldABeOutsideB( a, b ) {\n\tif ( a.priority < b.priority ) {\n\t\treturn true;\n\t} else if ( a.priority > b.priority ) {\n\t\treturn false;\n\t}\n\n\t// When priorities are equal and names are different - use identities.\n\treturn a.getIdentity() < b.getIdentity();\n}\n\n// Returns new position that is moved to near text node. Returns same position if there is no text node before of after\n// specified position.\n//\n//\t\t<p>foo[]</p>  ->  <p>foo{}</p>\n//\t\t<p>[]foo</p>  ->  <p>{}foo</p>\n//\n// @param {module:engine/view/position~Position} position\n// @returns {module:engine/view/position~Position} Position located inside text node or same position if there is no text nodes\n// before or after position location.\nfunction movePositionToTextNode( position ) {\n\tconst nodeBefore = position.nodeBefore;\n\n\tif ( nodeBefore && nodeBefore.is( 'text' ) ) {\n\t\treturn new Position( nodeBefore, nodeBefore.data.length );\n\t}\n\n\tconst nodeAfter = position.nodeAfter;\n\n\tif ( nodeAfter && nodeAfter.is( 'text' ) ) {\n\t\treturn new Position( nodeAfter, 0 );\n\t}\n\n\treturn position;\n}\n\n// Breaks text node into two text nodes when possible.\n//\n//\t\t<p>foo{}bar</p> -> <p>foo[]bar</p>\n//\t\t<p>{}foobar</p> -> <p>[]foobar</p>\n//\t\t<p>foobar{}</p> -> <p>foobar[]</p>\n//\n// @param {module:engine/view/position~Position} position Position that need to be placed inside text node.\n// @returns {module:engine/view/position~Position} New position after breaking text node.\nfunction breakTextNode( position ) {\n\tif ( position.offset == position.parent.data.length ) {\n\t\treturn new Position( position.parent.parent, position.parent.index + 1 );\n\t}\n\n\tif ( position.offset === 0 ) {\n\t\treturn new Position( position.parent.parent, position.parent.index );\n\t}\n\n\t// Get part of the text that need to be moved.\n\tconst textToMove = position.parent.data.slice( position.offset );\n\n\t// Leave rest of the text in position's parent.\n\tposition.parent._data = position.parent.data.slice( 0, position.offset );\n\n\t// Insert new text node after position's parent text node.\n\tposition.parent.parent._insertChild( position.parent.index + 1, new Text( textToMove ) );\n\n\t// Return new position between two newly created text nodes.\n\treturn new Position( position.parent.parent, position.parent.index + 1 );\n}\n\n// Merges two text nodes into first node. Removes second node and returns merge position.\n//\n// @param {module:engine/view/text~Text} t1 First text node to merge. Data from second text node will be moved at the end of\n// this text node.\n// @param {module:engine/view/text~Text} t2 Second text node to merge. This node will be removed after merging.\n// @returns {module:engine/view/position~Position} Position after merging text nodes.\nfunction mergeTextNodes( t1, t2 ) {\n\t// Merge text data into first text node and remove second one.\n\tconst nodeBeforeLength = t1.data.length;\n\tt1._data += t2.data;\n\tt2._remove();\n\n\treturn new Position( t1, nodeBeforeLength );\n}\n\n// Returns `true` if range is located in same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}\n// (`start` and `end` positions are located inside same {@link module:engine/view/attributeelement~AttributeElement AttributeElement}),\n// starts on 0 offset and ends after last child node.\n//\n// @param {module:engine/view/range~Range} Range\n// @returns {Boolean}\nfunction rangeSpansOnAllChildren( range ) {\n\treturn range.start.parent == range.end.parent && range.start.parent.is( 'attributeElement' ) &&\n\t\trange.start.offset === 0 && range.end.offset === range.start.parent.childCount;\n}\n\n// Checks if provided nodes are valid to insert. Checks if each node is an instance of\n// {@link module:engine/view/text~Text Text} or {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n// {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElement} or\n// {@link module:engine/view/uielement~UIElement UIElement}.\n//\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-insert-invalid-node` when nodes to insert\n// contains instances that are not {@link module:engine/view/text~Text Texts},\n// {@link module:engine/view/emptyelement~EmptyElement EmptyElements},\n// {@link module:engine/view/uielement~UIElement UIElements},\n// {@link module:engine/view/attributeelement~AttributeElement AttributeElements} or\n// {@link module:engine/view/containerelement~ContainerElement ContainerElements}.\n//\n// @param Iterable.<module:engine/view/text~Text|module:engine/view/attributeelement~AttributeElement\n// |module:engine/view/containerelement~ContainerElement> nodes\nfunction validateNodesToInsert( nodes ) {\n\tfor ( const node of nodes ) {\n\t\tif ( !validNodesToInsert.some( ( validNode => node instanceof validNode ) ) ) { // eslint-disable-line no-use-before-define\n\t\t\t/**\n\t\t\t * Inserted nodes should be valid to insert. of {@link module:engine/view/attributeelement~AttributeElement AttributeElement},\n\t\t\t * {@link module:engine/view/containerelement~ContainerElement ContainerElement},\n\t\t\t * {@link module:engine/view/emptyelement~EmptyElement EmptyElement},\n\t\t\t * {@link module:engine/view/uielement~UIElement UIElement}, {@link module:engine/view/text~Text Text}.\n\t\t\t *\n\t\t\t * @error view-writer-insert-invalid-node\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-writer-insert-invalid-node' );\n\t\t}\n\n\t\tif ( !node.is( 'text' ) ) {\n\t\t\tvalidateNodesToInsert( node.getChildren() );\n\t\t}\n\t}\n}\n\nconst validNodesToInsert = [ Text, AttributeElement, ContainerElement, EmptyElement, UIElement ];\n\n// Checks if node is ContainerElement or DocumentFragment, because in most cases they should be treated the same way.\n//\n// @param {module:engine/view/node~Node} node\n// @returns {Boolean} Returns `true` if node is instance of ContainerElement or DocumentFragment.\nfunction isContainerOrFragment( node ) {\n\treturn node && ( node.is( 'containerElement' ) || node.is( 'documentFragment' ) );\n}\n\n// Checks if {@link module:engine/view/range~Range#start range start} and {@link module:engine/view/range~Range#end range end} are placed\n// inside same {@link module:engine/view/containerelement~ContainerElement container element}.\n// Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-writer-invalid-range-container` when validation fails.\n//\n// @param {module:engine/view/range~Range} range\nfunction validateRangeContainer( range ) {\n\tconst startContainer = getParentContainer( range.start );\n\tconst endContainer = getParentContainer( range.end );\n\n\tif ( !startContainer || !endContainer || startContainer !== endContainer ) {\n\t\t/**\n\t\t * Range container is invalid. This can happen if {@link module:engine/view/range~Range#start range start} and\n\t\t * {@link module:engine/view/range~Range#end range end} positions are not placed inside same container or\n\t\t * parent container for these positions cannot be found.\n\t\t *\n\t\t * @error view-writer-invalid-range-container\n\t\t */\n\t\tthrow new CKEditorError( 'view-writer-invalid-range-container' );\n\t}\n}\n\n// Checks if two attribute elements can be joined together. Elements can be joined together if, and only if\n// they do not have ids specified.\n//\n// @private\n// @param {module:engine/view/element~Element} a\n// @param {module:engine/view/element~Element} b\n// @returns {Boolean}\nfunction canBeJoined( a, b ) {\n\treturn a.id === null && b.id === null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window, Text */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Set of utils related to block and inline fillers handling.\n *\n * Browsers do not allow to put caret in elements which does not have height. Because of it, we need to fill all\n * empty elements which should be selectable with elements or characters called \"fillers\". Unfortunately there is no one\n * universal filler, this is why two types are uses:\n *\n * * Block filler is an element which fill block elements, like `<p>`. CKEditor uses `<br>` as a block filler during the editing,\n * as browsers do natively. So instead of an empty `<p>` there will be `<p><br></p>`. The advantage of block filler is that\n * it is transparent for the selection, so when the caret is before the `<br>` and user presses right arrow he will be\n * moved to the next paragraph, not after the `<br>`. The disadvantage is that it breaks a block, so it can not be used\n * in the middle of a line of text. The {@link module:engine/view/filler~BR_FILLER `<br>` filler} can be replaced with any other\n * character in the data output, for instance {@link module:engine/view/filler~NBSP_FILLER non-breaking space}.\n *\n * * Inline filler is a filler which does not break a line of text, so it can be used inside the text, for instance in the empty\n * `<b>` surrendered by text: `foo<b></b>bar`, if we want to put the caret there. CKEditor uses a sequence of the zero-width\n * spaces as an {@link module:engine/view/filler~INLINE_FILLER inline filler} having the predetermined\n * {@link module:engine/view/filler~INLINE_FILLER_LENGTH length}. A sequence is used, instead of a single character to\n * avoid treating random zero-width spaces as the inline filler. Disadvantage of the inline filler is that it is not\n * transparent for the selection. The arrow key moves the caret between zero-width spaces characters, so the additional\n * code is needed to handle the caret.\n *\n * Both inline and block fillers are handled by the {@link module:engine/view/renderer~Renderer renderer} and are not present in the\n * view.\n *\n * @module engine/view/filler\n */\n\n/**\n * `<br> filler creator. This is a function which creates `<br data-cke-filler=\"true\">` element.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~NBSP_FILLER\n * @function\n */\nexport const BR_FILLER = domDocument => {\n\tconst fillerBr = domDocument.createElement( 'br' );\n\tfillerBr.dataset.ckeFiller = true;\n\n\treturn fillerBr;\n};\n\n/**\n * Non-breaking space filler creator. This is a function which creates `&nbsp;` text node.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~BR_FILLER\n * @function\n */\nexport const NBSP_FILLER = domDocument => domDocument.createTextNode( '\\u00A0' );\n\n/**\n * Length of the {@link module:engine/view/filler~INLINE_FILLER INLINE_FILLER}.\n */\nexport const INLINE_FILLER_LENGTH = 7;\n\n/**\n * Inline filler which is sequence of the zero width spaces.\n */\nexport let INLINE_FILLER = '';\n\nfor ( let i = 0; i < INLINE_FILLER_LENGTH; i++ ) {\n\tINLINE_FILLER += '\\u200b';\n}\n\n/**\n * Checks if the node is a text node which starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( 'foo' ) ); // false\n *\t\tstartsWithFiller( document.createElement( 'p' ) ); // false\n *\n * @param {Node} domNode DOM node.\n * @returns {Boolean} True if the text node starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function startsWithFiller( domNode ) {\n\treturn ( domNode instanceof Text ) && ( domNode.data.substr( 0, INLINE_FILLER_LENGTH ) === INLINE_FILLER );\n}\n\n/**\n * Checks if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // false\n *\n * @param {Text} domText DOM text node.\n * @returns {Boolean} True if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isInlineFiller( domText ) {\n\treturn domText.data.length == INLINE_FILLER_LENGTH && startsWithFiller( domText );\n}\n\n/**\n * Get string data from the text node, removing an {@link module:engine/view/filler~INLINE_FILLER inline filler} from it,\n * if text node contains it.\n *\n *\t\tgetDataWithoutFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ) == 'foo' // true\n *\t\tgetDataWithoutFiller( document.createTextNode( 'foo' ) ) == 'foo' // true\n *\n * @param {Text} domText DOM text node, possible with inline filler.\n * @returns {String} Data without filler.\n */\nexport function getDataWithoutFiller( domText ) {\n\tif ( startsWithFiller( domText ) ) {\n\t\treturn domText.data.slice( INLINE_FILLER_LENGTH );\n\t} else {\n\t\treturn domText.data;\n\t}\n}\n\n// Cache block fillers templates to improve performance.\nconst templateBlockFillers = new WeakMap();\n\n/**\n * Checks if the node is an instance of the block filler of the given type.\n *\n *\t\tconst brFillerInstance = BR_FILLER( document );\n *\t\tisBlockFiller( brFillerInstance, BR_FILLER ); // true\n *\n * @param {Node} domNode DOM node to check.\n * @param {Function} blockFiller Block filler creator.\n * @returns {Boolean} True if text node contains only {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isBlockFiller( domNode, blockFiller ) {\n\tlet templateBlockFiller = templateBlockFillers.get( blockFiller );\n\n\tif ( !templateBlockFiller ) {\n\t\ttemplateBlockFiller = blockFiller( window.document );\n\t\ttemplateBlockFillers.set( blockFiller, templateBlockFiller );\n\t}\n\n\treturn domNode.isEqualNode( templateBlockFiller );\n}\n\n/**\n * Assign key observer which move cursor from the end of the inline filler to the beginning of it when\n * the left arrow is pressed, so the filler does not break navigation.\n *\n * @param {module:engine/view/view~View} view View controller instance we should inject quirks handling on.\n */\nexport function injectQuirksHandling( view ) {\n\tview.document.on( 'keydown', jumpOverInlineFiller );\n}\n\n// Move cursor from the end of the inline filler to the beginning of it when, so the filler does not break navigation.\nfunction jumpOverInlineFiller( evt, data ) {\n\tif ( data.keyCode == keyCodes.arrowleft ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\tif ( domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed ) {\n\t\t\tconst domParent = domSelection.getRangeAt( 0 ).startContainer;\n\t\t\tconst domOffset = domSelection.getRangeAt( 0 ).startOffset;\n\n\t\t\tif ( startsWithFiller( domParent ) && domOffset <= INLINE_FILLER_LENGTH ) {\n\t\t\t\tdomSelection.collapse( domParent, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/diff\n */\n\n// The following code is based on the \"O(NP) Sequence Comparison Algorithm\"\n// by Sun Wu, Udi Manber, Gene Myers, Webb Miller.\n\n/**\n * Calculates the difference between two arrays or strings producing an array containing a list of changes\n * necessary to transform input into output.\n *\n *\t\tdiff( 'aba', 'acca' ); // [ 'equal', 'insert', 'insert', 'delete', 'equal' ]\n *\n * @param {Array|String} a Input array or string.\n * @param {Array|String} b Output array or string.\n * @param {Function} [cmp] Optional function used to compare array values, by default === is used.\n * @returns {Array} Array of changes.\n */\nexport default function diff( a, b, cmp ) {\n\t// Set the comparator function.\n\tcmp = cmp || function( a, b ) {\n\t\treturn a === b;\n\t};\n\n\t// Temporary action type statics.\n\tlet _insert, _delete;\n\n\t// Swapped the arrays to use the shorter one as the first one.\n\tif ( b.length < a.length ) {\n\t\tconst tmp = a;\n\n\t\ta = b;\n\t\tb = tmp;\n\n\t\t// We swap the action types as well.\n\t\t_insert = 'delete';\n\t\t_delete = 'insert';\n\t} else {\n\t\t_insert = 'insert';\n\t\t_delete = 'delete';\n\t}\n\n\tconst m = a.length;\n\tconst n = b.length;\n\tconst delta = n - m;\n\n\t// Edit scripts, for each diagonal.\n\tconst es = {};\n\t// Furthest points, the furthest y we can get on each diagonal.\n\tconst fp = {};\n\n\tfunction snake( k ) {\n\t\t// We use -1 as an alternative below to handle initial values ( instead of filling the fp with -1 first ).\n\t\t// Furthest points (y) on the diagonal below k.\n\t\tconst y1 = ( fp[ k - 1 ] !== undefined ? fp[ k - 1 ] : -1 ) + 1;\n\t\t// Furthest points (y) on the diagonal above k.\n\t\tconst y2 = fp[ k + 1 ] !== undefined ? fp[ k + 1 ] : -1;\n\t\t// The way we should go to get further.\n\t\tconst dir = y1 > y2 ? -1 : 1;\n\n\t\t// Clone previous changes array (if any).\n\t\tif ( es[ k + dir ] ) {\n\t\t\tes[ k ] = es[ k + dir ].slice( 0 );\n\t\t}\n\n\t\t// Create changes array.\n\t\tif ( !es[ k ] ) {\n\t\t\tes[ k ] = [];\n\t\t}\n\n\t\t// Push the action.\n\t\tes[ k ].push( y1 > y2 ? _insert : _delete );\n\n\t\t// Set the beginning coordinates.\n\t\tlet y = Math.max( y1, y2 );\n\t\tlet x = y - k;\n\n\t\t// Traverse the diagonal as long as the values match.\n\t\twhile ( x < m && y < n && cmp( a[ x ], b[ y ] ) ) {\n\t\t\tx++;\n\t\t\ty++;\n\t\t\t// Push no change action.\n\t\t\tes[ k ].push( 'equal' );\n\t\t}\n\n\t\treturn y;\n\t}\n\n\tlet p = 0;\n\tlet k;\n\n\t// Traverse the graph until we reach the end of the longer string.\n\tdo {\n\t\t// Updates furthest points and edit scripts for diagonals below delta.\n\t\tfor ( k = -p; k < delta; k++ ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest points and edit scripts for diagonals above delta.\n\t\tfor ( k = delta + p; k > delta; k-- ) {\n\t\t\tfp[ k ] = snake( k );\n\t\t}\n\n\t\t// Updates furthest point and edit script for the delta diagonal.\n\t\t// note that the delta diagonal is the one which goes through the sink (m, n).\n\t\tfp[ delta ] = snake( delta );\n\n\t\tp++;\n\t} while ( fp[ delta ] !== n );\n\n\t// Return the final list of edit changes.\n\t// We remove the first item that represents the action for the injected nulls.\n\treturn es[ delta ].slice( 1 );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/insertat\n */\n\n/**\n * Inserts node to the parent at given index.\n *\n * @param {Element} parentElement Parent element.\n * @param {Number} index Insertions index.\n * @param {Node} nodeToInsert Node to insert.\n */\nexport default function insertAt( parentElement, index, nodeToInsert ) {\n\tparentElement.insertBefore( nodeToInsert, parentElement.childNodes[ index ] || null );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/remove\n */\n\n/**\n * Removes given node from parent.\n *\n * @param {Node} node Node to remove.\n */\nexport default function remove( node ) {\n\tconst parent = node.parentNode;\n\n\tif ( parent ) {\n\t\tparent.removeChild( node );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/istext\n */\n\n/**\n * Checks if the object is a native DOM Text node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isText( obj ) {\n\treturn Object.prototype.toString.call( obj ) == '[object Text]';\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/isnode\n */\n\n/**\n * Checks if the object is a native DOM Node.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isNode( obj ) {\n\tif ( obj ) {\n\t\tif ( obj.defaultView ) {\n\t\t\treturn obj instanceof obj.defaultView.Document;\n\t\t} else if ( obj.ownerDocument && obj.ownerDocument.defaultView ) {\n\t\t\treturn obj instanceof obj.ownerDocument.defaultView.Node;\n\t\t}\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/fastdiff\n */\n\n/**\n * Finds position of the first and last change in the given strings and generates set of changes. Set of changes\n * can be applied to the input text in order to transform it into the output text, for example:\n *\n *\t\tfastDiff( '12a', '12xyza' );\n *\t\t// [ { index: 2, type: 'insert', values: [ 'x', 'y', 'z' ] } ]\n *\n *\t\tfastDiff( '12a', '12aa' );\n *\t\t// [ { index: 3, type: 'insert', values: [ 'a' ] } ]\n *\n *\t\tfastDiff( '12xyza', '12a' );\n *\t\t// [ { index: 2, type: 'delete', howMany: 3 } ]\n *\n *\t\tfastDiff( '12aa', '12a' );\n *\t\t// [ { index: 3, type: 'delete', howMany: 1 } ]\n *\n *\t\tfastDiff( '12abc3', '2ab' );\n *\t\t// [ { index: 0, type: 'insert', values: [ '2', 'a', 'b' ] }, { index: 3, type: 'delete', howMany: 6 } ]\n *\n * Using returned results you can modify `oldText` to transform it into `newText`:\n *\n * \t\tlet input = '12abc3';\n * \t\tconst output = '2ab';\n * \t\tconst changes = fastDiff( input, output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + change.values.join( '' ) + input.substring( change.index );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput = input.substring( 0, change.index ) + input.substring( change.index + change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\tinput === output; // -> true\n *\n * The output format of this function is compatible with {@link module:utils/difftochanges~diffToChanges} output format.\n *\n * @param {String} oldText Input string.\n * @param {String} newText Input string.\n * @returns {Array} Array of changes.\n */\nexport default function fastDiff( oldText, newText ) {\n\t// Check if both texts are equal.\n\tif ( oldText === newText ) {\n\t\treturn [];\n\t}\n\n\tconst changeIndexes = findChangeBoundaryIndexes( oldText, newText );\n\n\treturn changeIndexesToChanges( newText, changeIndexes );\n}\n\n// Finds position of the first and last change in the given strings. For example:\n//\n//\t\tconst indexes = findChangeBoundaryIndexes( '1234', '13424' );\n//\t\tconsole.log( indexes ); // { firstIndex: 1, lastIndexOld: 3, lastIndexNew: 4 }\n//\n// The above indexes means that in `oldText` modified part is `1[23]4` and in the `newText` it is `1[342]4`.\n// Based on such indexes, array with `insert`/`delete` operations which allows transforming\n// old text to the new one can be generated.\n//\n// It is expected that `oldText` and `newText` are different.\n//\n// @param {String} oldText\n// @param {String} newText\n// @returns {Object}\n// @returns {Number} return.firstIndex Index of the first change in both strings (always the same for both).\n// @returns {Number} result.lastIndexOld Index of the last common character in `oldText` string.\n// @returns {Number} result.lastIndexNew Index of the last common character in `newText` string.\nfunction findChangeBoundaryIndexes( oldText, newText ) {\n\t// Find the first difference between texts.\n\tconst firstIndex = findFirstDifferenceIndex( oldText, newText );\n\n\t// Remove the common part of texts and reverse them to make it simpler to find the last difference between texts.\n\tconst oldTextReversed = cutAndReverse( oldText, firstIndex );\n\tconst newTextReversed = cutAndReverse( newText, firstIndex );\n\n\t// Find the first difference between reversed texts.\n\t// It should be treated as \"how many characters from the end the last difference occurred\".\n\t//\n\t// For example:\n\t//\n\t// \t\t\tinitial\t->\tafter cut\t-> reversed:\n\t// oldText:\t'321ba'\t->\t'21ba'\t\t-> 'ab12'\n\t// newText:\t'31xba'\t->\t'1xba'\t\t-> 'abx1'\n\t// lastIndex:\t\t\t\t\t\t->    2\n\t//\n\t// So the last change occurred two characters from the end of the texts.\n\tconst lastIndex = findFirstDifferenceIndex( oldTextReversed, newTextReversed );\n\n\t// Use `lastIndex` to calculate proper offset, starting from the beginning (`lastIndex` kind of starts from the end).\n\tconst lastIndexOld = oldText.length - lastIndex;\n\tconst lastIndexNew = newText.length - lastIndex;\n\n\treturn { firstIndex, lastIndexOld, lastIndexNew };\n}\n\n// Returns a first index on which `oldText` and `newText` differ.\n//\n// @param {String} oldText\n// @param {String} newText\n// @returns {Number}\nfunction findFirstDifferenceIndex( oldText, newText ) {\n\tfor ( let i = 0; i < Math.max( oldText.length, newText.length ); i++ ) {\n\t\tif ( oldText[ i ] !== newText[ i ] ) {\n\t\t\treturn i;\n\t\t}\n\t}\n\t// No \"backup\" return cause we assume that `oldText` and `newText` differ. This means that they either have a\n\t// difference or they have a different lengths. This means that the `if` condition will always be met eventually.\n}\n\n// Removes `howMany` characters from the given `text` string starting from the beginning, then reverses and returns it.\n//\n// @param {String} text Text to be processed.\n// @param {Number} howMany How many characters from text beginning to cut.\n// @returns {String} Shortened and reversed text.\nfunction cutAndReverse( text, howMany ) {\n\treturn text.substring( howMany ).split( '' ).reverse().join( '' );\n}\n\n// Generates changes array based on change indexes from `findChangeBoundaryIndexes` function. This function will\n// generate array with 0 (no changes), 1 (deletion or insertion) or 2 records (insertion and deletion).\n//\n// @param {String} newText New text for which change indexes were calculated.\n// @param {Object} changeIndexes Change indexes object from `findChangeBoundaryIndexes` function.\n// @returns {Array.<Object>} Array of changes compatible with {@link module:utils/difftochanges~diffToChanges} format.\nfunction changeIndexesToChanges( newText, changeIndexes ) {\n\tconst result = [];\n\tconst { firstIndex, lastIndexOld, lastIndexNew } = changeIndexes;\n\n\t// Order operations as 'insert', 'delete' array to keep compatibility with {@link module:utils/difftochanges~diffToChanges}\n\t// in most cases. However, 'diffToChanges' does not stick to any order so in some cases\n\t// (for example replacing '12345' with 'abcd') it will generate 'delete', 'insert' order.\n\tif ( lastIndexNew - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex,\n\t\t\ttype: 'insert',\n\t\t\tvalues: newText.substring( firstIndex, lastIndexNew ).split( '' )\n\t\t} );\n\t}\n\n\tif ( lastIndexOld - firstIndex > 0 ) {\n\t\tresult.push( {\n\t\t\tindex: firstIndex + ( lastIndexNew - firstIndex ), // Increase index of what was inserted.\n\t\t\ttype: 'delete',\n\t\t\thowMany: lastIndexOld - firstIndex\n\t\t} );\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/renderer\n */\n\nimport ViewText from './text';\nimport ViewPosition from './position';\nimport { INLINE_FILLER, INLINE_FILLER_LENGTH, startsWithFiller, isInlineFiller, isBlockFiller } from './filler';\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport insertAt from '@ckeditor/ckeditor5-utils/src/dom/insertat';\nimport remove from '@ckeditor/ckeditor5-utils/src/dom/remove';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport fastDiff from '@ckeditor/ckeditor5-utils/src/fastdiff';\n\n/**\n * Renderer is responsible for updating the DOM structure and the DOM selection based on\n * the {@link module:engine/view/renderer~Renderer#markToSync information about updated view nodes}.\n * In other words, it renders the view to the DOM.\n *\n * Its main responsibility is to make only the necessary, minimal changes to the DOM. However, unlike in many\n * virtual DOM implementations, the primary reason for doing minimal changes is not the performance but ensuring\n * that native editing features such as text composition, autocompletion, spell checking, selection's x-index are\n * affected as little as possible.\n *\n * Renderer uses {@link module:engine/view/domconverter~DomConverter} to transform view nodes and positions\n * to and from the DOM.\n */\nexport default class Renderer {\n\t/**\n\t * Creates a renderer instance.\n\t *\n\t * @param {module:engine/view/domconverter~DomConverter} domConverter Converter instance.\n\t * @param {module:engine/view/documentselection~DocumentSelection} selection View selection.\n\t */\n\tconstructor( domConverter, selection ) {\n\t\t/**\n\t\t * Set of DOM Documents instances.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<Document>}\n\t\t */\n\t\tthis.domDocuments = new Set();\n\n\t\t/**\n\t\t * Converter instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = domConverter;\n\n\t\t/**\n\t\t * Set of nodes which attributes changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedAttributes = new Set();\n\n\t\t/**\n\t\t * Set of elements which child lists changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedChildren = new Set();\n\n\t\t/**\n\t\t * Set of text nodes which text data changed and may need to be rendered.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis.markedTexts = new Set();\n\n\t\t/**\n\t\t * View selection. Renderer updates DOM selection based on the view selection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = selection;\n\n\t\t/**\n\t\t * Indicates if the view document is focused and selection can be rendered. Selection will not be rendered if\n\t\t * this is set to `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isFocused = false;\n\n\t\t/**\n\t\t * The text node in which the inline filler was rendered.\n\t\t *\n\t\t * @private\n\t\t * @member {Text}\n\t\t */\n\t\tthis._inlineFiller = null;\n\n\t\t/**\n\t\t * DOM element containing fake selection.\n\t\t *\n\t\t * @private\n\t\t * @type {null|HTMLElement}\n\t\t */\n\t\tthis._fakeSelectionContainer = null;\n\t}\n\n\t/**\n\t * Marks a view node to be updated in the DOM by {@link #render `render()`}.\n\t *\n\t * Note that only view nodes whose parents have corresponding DOM elements need to be marked to be synchronized.\n\t *\n\t * @see #markedAttributes\n\t * @see #markedChildren\n\t * @see #markedTexts\n\t *\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Node to be marked.\n\t */\n\tmarkToSync( type, node ) {\n\t\tif ( type === 'text' ) {\n\t\t\tif ( this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis.markedTexts.add( node );\n\t\t\t}\n\t\t} else {\n\t\t\t// If the node has no DOM element it is not rendered yet,\n\t\t\t// its children/attributes do not need to be marked to be sync.\n\t\t\tif ( !this.domConverter.mapViewToDom( node ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( type === 'attributes' ) {\n\t\t\t\tthis.markedAttributes.add( node );\n\t\t\t} else if ( type === 'children' ) {\n\t\t\t\tthis.markedChildren.add( node );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * Unknown type passed to Renderer.markToSync.\n\t\t\t\t *\n\t\t\t\t * @error renderer-unknown-type\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'view-renderer-unknown-type: Unknown type passed to Renderer.markToSync.' );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders all buffered changes ({@link #markedAttributes}, {@link #markedChildren} and {@link #markedTexts}) and\n\t * the current view selection (if needed) to the DOM by applying a minimal set of changes to it.\n\t *\n\t * Renderer tries not to break the text composition (e.g. IME) and x-index of the selection,\n\t * so it does as little as it is needed to update the DOM.\n\t *\n\t * Renderer also handles {@link module:engine/view/filler fillers}. Especially, it checks if the inline filler is needed\n\t * at the selection position and adds or removes it. To prevent breaking text composition inline filler will not be\n\t * removed as long as the selection is in the text node which needed it at first.\n\t */\n\trender() {\n\t\tlet inlineFillerPosition;\n\n\t\t// Refresh mappings.\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildrenMappings( element );\n\t\t}\n\n\t\t// There was inline filler rendered in the DOM but it's not\n\t\t// at the selection position any more, so we can remove it\n\t\t// (cause even if it's needed, it must be placed in another location).\n\t\tif ( this._inlineFiller && !this._isSelectionInInlineFiller() ) {\n\t\t\tthis._removeInlineFiller();\n\t\t}\n\n\t\t// If we've got the filler, let's try to guess its position in the view.\n\t\tif ( this._inlineFiller ) {\n\t\t\tinlineFillerPosition = this._getInlineFillerPosition();\n\t\t}\n\t\t// Otherwise, if it's needed, create it at the selection position.\n\t\telse if ( this._needsInlineFillerAtSelection() ) {\n\t\t\tinlineFillerPosition = this.selection.getFirstPosition();\n\n\t\t\t// Do not use `markToSync` so it will be added even if the parent is already added.\n\t\t\tthis.markedChildren.add( inlineFillerPosition.parent );\n\t\t}\n\n\t\tfor ( const element of this.markedAttributes ) {\n\t\t\tthis._updateAttrs( element );\n\t\t}\n\n\t\tfor ( const element of this.markedChildren ) {\n\t\t\tthis._updateChildren( element, { inlineFillerPosition } );\n\t\t}\n\n\t\tfor ( const node of this.markedTexts ) {\n\t\t\tif ( !this.markedChildren.has( node.parent ) && this.domConverter.mapViewToDom( node.parent ) ) {\n\t\t\t\tthis._updateText( node, { inlineFillerPosition } );\n\t\t\t}\n\t\t}\n\n\t\t// Check whether the inline filler is required and where it really is in the DOM.\n\t\t// At this point in most cases it will be in the DOM, but there are exceptions.\n\t\t// For example, if the inline filler was deep in the created DOM structure, it will not be created.\n\t\t// Similarly, if it was removed at the beginning of this function and then neither text nor children were updated,\n\t\t// it will not be present.\n\t\t// Fix those and similar scenarios.\n\t\tif ( inlineFillerPosition ) {\n\t\t\tconst fillerDomPosition = this.domConverter.viewPositionToDom( inlineFillerPosition );\n\t\t\tconst domDocument = fillerDomPosition.parent.ownerDocument;\n\n\t\t\tif ( !startsWithFiller( fillerDomPosition.parent ) ) {\n\t\t\t\t// Filler has not been created at filler position. Create it now.\n\t\t\t\tthis._inlineFiller = addInlineFiller( domDocument, fillerDomPosition.parent, fillerDomPosition.offset );\n\t\t\t} else {\n\t\t\t\t// Filler has been found, save it.\n\t\t\t\tthis._inlineFiller = fillerDomPosition.parent;\n\t\t\t}\n\t\t} else {\n\t\t\t// There is no filler needed.\n\t\t\tthis._inlineFiller = null;\n\t\t}\n\n\t\tthis._updateSelection();\n\t\tthis._updateFocus();\n\n\t\tthis.markedTexts.clear();\n\t\tthis.markedAttributes.clear();\n\t\tthis.markedChildren.clear();\n\t}\n\n\t/**\n\t * Updates mappings of view element's children.\n\t *\n\t * Children that were replaced in the view structure by similar elements (same tag name) are treated as 'replaced'.\n\t * This means that their mappings can be updated so the new view elements are mapped to the existing DOM elements.\n\t * Thanks to that these elements do not need to be re-rendered completely.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose children mappings will be updated.\n\t */\n\t_updateChildrenMappings( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM and there is no need to process it.\n\t\t\treturn;\n\t\t}\n\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { withChildren: false } )\n\t\t);\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\t\tconst actions = this._findReplaceActions( diff, actualDomChildren, expectedDomChildren );\n\n\t\tif ( actions.indexOf( 'replace' ) !== -1 ) {\n\t\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'replace' ) {\n\t\t\t\t\tconst insertIndex = counter.equal + counter.insert;\n\t\t\t\t\tconst deleteIndex = counter.equal + counter.delete;\n\t\t\t\t\tconst viewChild = viewElement.getChild( insertIndex );\n\n\t\t\t\t\t// The 'uiElement' is a special one and its children are not stored in a view (#799),\n\t\t\t\t\t// so we cannot use it with replacing flow (since it uses view children during rendering\n\t\t\t\t\t// which will always result in rendering empty element).\n\t\t\t\t\tif ( viewChild && !viewChild.is( 'uiElement' ) ) {\n\t\t\t\t\t\tthis._updateElementMappings( viewChild, actualDomChildren[ deleteIndex ] );\n\t\t\t\t\t}\n\n\t\t\t\t\tremove( expectedDomChildren[ insertIndex ] );\n\t\t\t\t\tcounter.equal++;\n\t\t\t\t} else {\n\t\t\t\t\tcounter[ action ]++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Updates mappings of a given view element.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewElement The view element whose mappings will be updated.\n\t * @param {Node} domElement The DOM element representing the given view element.\n\t */\n\t_updateElementMappings( viewElement, domElement ) {\n\t\t// Because we replace new view element mapping with the existing one, the corresponding DOM element\n\t\t// will not be rerendered. The new view element may have different attributes than the previous one.\n\t\t// Since its corresponding DOM element will not be rerendered, new attributes will not be added\n\t\t// to the DOM, so we need to mark it here to make sure its attributes gets updated.\n\t\t// Such situations may happen if only new view element was added to `this.markedAttributes`\n\t\t// or none of the elements were added (relying on 'this._updateChildren()' which by rerendering the element\n\t\t// also rerenders its attributes). See #1427 for more detailed case study.\n\t\tconst newViewChild = this.domConverter.mapDomToView( domElement );\n\n\t\t// It may also happen that 'newViewChild' mapping is not present since its parent mapping\n\t\t// was already removed (the 'domConverter.unbindDomElement()' method also unbinds children\n\t\t// mappings) so we also check for '!newViewChild'.\n\t\tif ( !newViewChild || newViewChild && !newViewChild.isSimilar( viewElement ) ) {\n\t\t\tthis.markedAttributes.add( viewElement );\n\t\t}\n\n\t\t// Remap 'DomConverter' bindings.\n\t\tthis.domConverter.unbindDomElement( domElement );\n\t\tthis.domConverter.bindElements( domElement, viewElement );\n\n\t\t// View element may have children which needs to be updated, but are not marked, mark them to update.\n\t\tthis.markedChildren.add( viewElement );\n\t}\n\n\t/**\n\t * Gets the position of the inline filler based on the current selection.\n\t * Here, we assume that we know that the filler is needed and\n\t * {@link #_isSelectionInInlineFiller is at the selection position}, and, since it is needed,\n\t * it is somewhere at the selection position.\n\t *\n\t * Note: The filler position cannot be restored based on the filler's DOM text node, because\n\t * when this method is called (before rendering), the bindings will often be broken. View-to-DOM\n\t * bindings are only dependable after rendering.\n\t *\n\t * @private\n\t * @returns {module:engine/view/position~Position}\n\t */\n\t_getInlineFillerPosition() {\n\t\tconst firstPos = this.selection.getFirstPosition();\n\n\t\tif ( firstPos.parent.is( 'text' ) ) {\n\t\t\treturn ViewPosition.createBefore( this.selection.getFirstPosition().parent );\n\t\t} else {\n\t\t\treturn firstPos;\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` if the selection has not left the inline filler's text node.\n\t * If it is `true`, it means that the filler had been added for a reason and the selection did not\n\t * leave the filler's text node. For example, the user can be in the middle of a composition so it should not be touched.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler and selection are in the same place.\n\t */\n\t_isSelectionInInlineFiller() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Note, we can't check if selection's position equals position of the\n\t\t// this._inlineFiller node, because of #663. We may not be able to calculate\n\t\t// the filler's position in the view at this stage.\n\t\t// Instead, we check it the other way – whether selection is anchored in\n\t\t// that text node or next to it.\n\n\t\t// Possible options are:\n\t\t// \"FILLER{}\"\n\t\t// \"FILLERadded-text{}\"\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst position = this.domConverter.viewPositionToDom( selectionPosition );\n\n\t\tif ( position && isText( position.parent ) && startsWithFiller( position.parent ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Removes the inline filler.\n\t *\n\t * @private\n\t */\n\t_removeInlineFiller() {\n\t\tconst domFillerNode = this._inlineFiller;\n\n\t\t// Something weird happened and the stored node doesn't contain the filler's text.\n\t\tif ( !startsWithFiller( domFillerNode ) ) {\n\t\t\t/**\n\t\t\t * The inline filler node was lost. Most likely, something overwrote the filler text node\n\t\t\t * in the DOM.\n\t\t\t *\n\t\t\t * @error view-renderer-filler-was-lost\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-renderer-filler-was-lost: The inline filler node was lost.' );\n\t\t}\n\n\t\tif ( isInlineFiller( domFillerNode ) ) {\n\t\t\tdomFillerNode.parentNode.removeChild( domFillerNode );\n\t\t} else {\n\t\t\tdomFillerNode.data = domFillerNode.data.substr( INLINE_FILLER_LENGTH );\n\t\t}\n\n\t\tthis._inlineFiller = null;\n\t}\n\n\t/**\n\t * Checks if the inline {@link module:engine/view/filler filler} should be added.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if the inline filler should be added.\n\t */\n\t_needsInlineFillerAtSelection() {\n\t\tif ( this.selection.rangeCount != 1 || !this.selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst selectionPosition = this.selection.getFirstPosition();\n\t\tconst selectionParent = selectionPosition.parent;\n\t\tconst selectionOffset = selectionPosition.offset;\n\n\t\t// If there is no DOM root we do not care about fillers.\n\t\tif ( !this.domConverter.mapViewToDom( selectionParent.root ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !( selectionParent.is( 'element' ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Prevent adding inline filler inside elements with contenteditable=false.\n\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/1170\n\t\tif ( !isEditable( selectionParent ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// We have block filler, we do not need inline one.\n\t\tif ( selectionOffset === selectionParent.getFillerOffset() ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst nodeBefore = selectionPosition.nodeBefore;\n\t\tconst nodeAfter = selectionPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText || nodeAfter instanceof ViewText ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks if text needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} viewText View text to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateText( viewText, options ) {\n\t\tconst domText = this.domConverter.findCorrespondingDomText( viewText );\n\t\tconst newDomText = this.domConverter.viewToDom( viewText, domText.ownerDocument );\n\n\t\tconst actualText = domText.data;\n\t\tlet expectedText = newDomText.data;\n\n\t\tconst filler = options.inlineFillerPosition;\n\n\t\tif ( filler && filler.parent == viewText.parent && filler.offset == viewText.index ) {\n\t\t\texpectedText = INLINE_FILLER + expectedText;\n\t\t}\n\n\t\tif ( actualText != expectedText ) {\n\t\t\tconst actions = fastDiff( actualText, expectedText );\n\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action.type === 'insert' ) {\n\t\t\t\t\tdomText.insertData( action.index, action.values.join( '' ) );\n\t\t\t\t} else { // 'delete'\n\t\t\t\t\tdomText.deleteData( action.index, action.howMany );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if attribute list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement The view element to update.\n\t */\n\t_updateAttrs( viewElement ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that 'viewElement' is outdated as its mapping was updated\n\t\t\t// in 'this._updateChildrenMappings()'. There is no need to process it as new view element which\n\t\t\t// replaced old 'viewElement' mapping was also added to 'this.markedAttributes'\n\t\t\t// in 'this._updateChildrenMappings()' so it will be processed separately.\n\t\t\treturn;\n\t\t}\n\n\t\tconst domAttrKeys = Array.from( domElement.attributes ).map( attr => attr.name );\n\t\tconst viewAttrKeys = viewElement.getAttributeKeys();\n\n\t\t// Add or overwrite attributes.\n\t\tfor ( const key of viewAttrKeys ) {\n\t\t\tdomElement.setAttribute( key, viewElement.getAttribute( key ) );\n\t\t}\n\n\t\t// Remove from DOM attributes which do not exists in the view.\n\t\tfor ( const key of domAttrKeys ) {\n\t\t\tif ( !viewElement.hasAttribute( key ) ) {\n\t\t\t\tdomElement.removeAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if elements child list needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewElement View element to update.\n\t * @param {Object} options\n\t * @param {module:engine/view/position~Position} options.inlineFillerPosition The position where the inline\n\t * filler should be rendered.\n\t */\n\t_updateChildren( viewElement, options ) {\n\t\tconst domElement = this.domConverter.mapViewToDom( viewElement );\n\n\t\tif ( !domElement ) {\n\t\t\t// If there is no `domElement` it means that it was already removed from DOM.\n\t\t\t// There is no need to process it. It will be processed when re-inserted.\n\t\t\treturn;\n\t\t}\n\n\t\tconst inlineFillerPosition = options.inlineFillerPosition;\n\t\tconst actualDomChildren = this.domConverter.mapViewToDom( viewElement ).childNodes;\n\t\tconst expectedDomChildren = Array.from(\n\t\t\tthis.domConverter.viewChildrenToDom( viewElement, domElement.ownerDocument, { bind: true, inlineFillerPosition } )\n\t\t);\n\n\t\t// Inline filler element has to be created as it is present in the DOM, but not in the view. It is required\n\t\t// during diffing so text nodes could be compared correctly and also during rendering to maintain\n\t\t// proper order and indexes while updating the DOM.\n\t\tif ( inlineFillerPosition && inlineFillerPosition.parent === viewElement ) {\n\t\t\taddInlineFiller( domElement.ownerDocument, expectedDomChildren, inlineFillerPosition.offset );\n\t\t}\n\n\t\tconst diff = this._diffNodeLists( actualDomChildren, expectedDomChildren );\n\n\t\tlet i = 0;\n\t\tconst nodesToUnbind = new Set();\n\n\t\tfor ( const action of diff ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\tinsertAt( domElement, i, expectedDomChildren[ i ] );\n\t\t\t\ti++;\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tnodesToUnbind.add( actualDomChildren[ i ] );\n\t\t\t\tremove( actualDomChildren[ i ] );\n\t\t\t} else { // 'equal'\n\t\t\t\t// Force updating text nodes inside elements which did not change and do not need to be re-rendered (#1125).\n\t\t\t\tthis._markDescendantTextToSync( this.domConverter.domToView( expectedDomChildren[ i ] ) );\n\t\t\t\ti++;\n\t\t\t}\n\t\t}\n\n\t\t// Unbind removed nodes. When node does not have a parent it means that it was removed from DOM tree during\n\t\t// comparision with the expected DOM. We don't need to check child nodes, because if child node was reinserted,\n\t\t// it was moved to DOM tree out of the removed node.\n\t\tfor ( const node of nodesToUnbind ) {\n\t\t\tif ( !node.parentNode ) {\n\t\t\t\tthis.domConverter.unbindDomElement( node );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Shorthand for diffing two arrays or node lists of DOM nodes.\n\t *\n\t * @private\n\t * @param {Array.<Node>|NodeList} actualDomChildren Actual DOM children\n\t * @param {Array.<Node>|NodeList} expectedDomChildren Expected DOM children.\n\t * @returns {Array.<String>} The list of actions based on the {@link module:utils/diff~diff} function.\n\t */\n\t_diffNodeLists( actualDomChildren, expectedDomChildren ) {\n\t\treturn diff( actualDomChildren, expectedDomChildren, sameNodes.bind( null, this.domConverter.blockFiller ) );\n\t}\n\n\t/**\n\t * Finds DOM nodes that were replaced with the similar nodes (same tag name) in the view. All nodes are compared\n\t * within one `insert`/`delete` action group, for example:\n\t *\n\t * \t\tActual DOM:\t\t<p><b>Foo</b>Bar<i>Baz</i><b>Bax</b></p>\n\t * \t\tExpected DOM:\t<p>Bar<b>123</b><i>Baz</i><b>456</b></p>\n\t * \t\tInput actions:\t[ insert, insert, delete, delete, equal, insert, delete ]\n\t * \t\tOutput actions:\t[ insert, replace, delete, equal, replace ]\n\t *\n\t * @private\n\t * @param {Array.<String>} actions Actions array which is a result of the {@link module:utils/diff~diff} function.\n\t * @param {Array.<Node>|NodeList} actualDom Actual DOM children\n\t * @param {Array.<Node>} expectedDom Expected DOM children.\n\t * @returns {Array.<String>} Actions array modified with the `replace` actions.\n\t */\n\t_findReplaceActions( actions, actualDom, expectedDom ) {\n\t\t// If there is no both 'insert' and 'delete' actions, no need to check for replaced elements.\n\t\tif ( actions.indexOf( 'insert' ) === -1 || actions.indexOf( 'delete' ) === -1 ) {\n\t\t\treturn actions;\n\t\t}\n\n\t\tlet newActions = [];\n\t\tlet actualSlice = [];\n\t\tlet expectedSlice = [];\n\n\t\tconst counter = { equal: 0, insert: 0, delete: 0 };\n\n\t\tfor ( const action of actions ) {\n\t\t\tif ( action === 'insert' ) {\n\t\t\t\texpectedSlice.push( expectedDom[ counter.equal + counter.insert ] );\n\t\t\t} else if ( action === 'delete' ) {\n\t\t\t\tactualSlice.push( actualDom[ counter.equal + counter.delete ] );\n\t\t\t} else { // equal\n\t\t\t\tnewActions = newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t\t\t\tnewActions.push( 'equal' );\n\t\t\t\t// Reset stored elements on 'equal'.\n\t\t\t\tactualSlice = [];\n\t\t\t\texpectedSlice = [];\n\t\t\t}\n\t\t\tcounter[ action ]++;\n\t\t}\n\n\t\treturn newActions.concat( diff( actualSlice, expectedSlice, areSimilar ).map( x => x === 'equal' ? 'replace' : x ) );\n\t}\n\n\t/**\n\t * Marks text nodes to be synchronized.\n\t *\n\t * If a text node is passed, it will be marked. If an element is passed, all descendant text nodes inside it will be marked.\n\t *\n\t * @private\n\t * @param {module:engine/view/node~Node} viewNode View node to sync.\n\t */\n\t_markDescendantTextToSync( viewNode ) {\n\t\tif ( !viewNode ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( viewNode.is( 'text' ) ) {\n\t\t\tthis.markedTexts.add( viewNode );\n\t\t} else if ( viewNode.is( 'element' ) ) {\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tthis._markDescendantTextToSync( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks if the selection needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateSelection() {\n\t\t// If there is no selection - remove DOM and fake selections.\n\t\tif ( this.selection.rangeCount === 0 ) {\n\t\t\tthis._removeDomSelection();\n\t\t\tthis._removeFakeSelection();\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst domRoot = this.domConverter.mapViewToDom( this.selection.editableElement );\n\n\t\t// Do nothing if there is no focus, or there is no DOM element corresponding to selection's editable element.\n\t\tif ( !this.isFocused || !domRoot ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Render selection.\n\t\tif ( this.selection.isFake ) {\n\t\t\tthis._updateFakeSelection( domRoot );\n\t\t} else {\n\t\t\tthis._removeFakeSelection();\n\t\t\tthis._updateDomSelection( domRoot );\n\t\t}\n\t}\n\n\t/**\n\t * Updates the fake selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the fake selection container should be added.\n\t */\n\t_updateFakeSelection( domRoot ) {\n\t\tconst domDocument = domRoot.ownerDocument;\n\t\tlet container = this._fakeSelectionContainer;\n\n\t\t// Create fake selection container if one does not exist.\n\t\tif ( !container ) {\n\t\t\tthis._fakeSelectionContainer = container = domDocument.createElement( 'div' );\n\n\t\t\tObject.assign( container.style, {\n\t\t\t\tposition: 'fixed',\n\t\t\t\ttop: 0,\n\t\t\t\tleft: '-9999px',\n\t\t\t\t// See https://github.com/ckeditor/ckeditor5/issues/752.\n\t\t\t\twidth: '42px'\n\t\t\t} );\n\n\t\t\t// Fill it with a text node so we can update it later.\n\t\t\tcontainer.appendChild( domDocument.createTextNode( '\\u00A0' ) );\n\t\t}\n\n\t\t// Add fake container if not already added.\n\t\tif ( !container.parentElement ) {\n\t\t\tdomRoot.appendChild( container );\n\t\t}\n\n\t\t// Update contents.\n\t\tcontainer.firstChild.data = this.selection.fakeSelectionLabel || '\\u00A0';\n\n\t\t// Update selection.\n\t\tconst domSelection = domDocument.getSelection();\n\t\tconst domRange = domDocument.createRange();\n\n\t\tdomSelection.removeAllRanges();\n\t\tdomRange.selectNodeContents( container );\n\t\tdomSelection.addRange( domRange );\n\n\t\t// Bind fake selection container with current selection.\n\t\tthis.domConverter.bindFakeSelection( container, this.selection );\n\t}\n\n\t/**\n\t * Updates the DOM selection.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot A valid DOM root where the DOM selection should be rendered.\n\t */\n\t_updateDomSelection( domRoot ) {\n\t\tconst domSelection = domRoot.ownerDocument.defaultView.getSelection();\n\n\t\t// Let's check whether DOM selection needs updating at all.\n\t\tif ( !this._domSelectionNeedsUpdate( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Multi-range selection is not available in most browsers, and, at least in Chrome, trying to\n\t\t// set such selection, that is not continuous, throws an error. Because of that, we will just use anchor\n\t\t// and focus of view selection.\n\t\t// Since we are not supporting multi-range selection, we also do not need to check if proper editable is\n\t\t// selected. If there is any editable selected, it is okay (editable is taken from selection anchor).\n\t\tconst anchor = this.domConverter.viewPositionToDom( this.selection.anchor );\n\t\tconst focus = this.domConverter.viewPositionToDom( this.selection.focus );\n\n\t\t// Focus the new editing host.\n\t\t// Otherwise, FF may throw an error (https://github.com/ckeditor/ckeditor5/issues/721).\n\t\tdomRoot.focus();\n\n\t\tdomSelection.collapse( anchor.parent, anchor.offset );\n\t\tdomSelection.extend( focus.parent, focus.offset );\n\t}\n\n\t/**\n\t * Checks whether a given DOM selection needs to be updated.\n\t *\n\t * @private\n\t * @param {Selection} domSelection The DOM selection to check.\n\t * @returns {Boolean}\n\t */\n\t_domSelectionNeedsUpdate( domSelection ) {\n\t\tif ( !this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\t// Current DOM selection is in incorrect position. We need to update it.\n\t\t\treturn true;\n\t\t}\n\n\t\tconst oldViewSelection = domSelection && this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( oldViewSelection && this.selection.isEqual( oldViewSelection ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If selection is not collapsed, it does not need to be updated if it is similar.\n\t\tif ( !this.selection.isCollapsed && this.selection.isSimilar( oldViewSelection ) ) {\n\t\t\t// Selection did not changed and is correct, do not update.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Selections are not similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Removes the DOM selection.\n\t *\n\t * @private\n\t */\n\t_removeDomSelection() {\n\t\tfor ( const doc of this.domDocuments ) {\n\t\t\tconst domSelection = doc.getSelection();\n\n\t\t\tif ( domSelection.rangeCount ) {\n\t\t\t\tconst activeDomElement = doc.activeElement;\n\t\t\t\tconst viewElement = this.domConverter.mapDomToView( activeDomElement );\n\n\t\t\t\tif ( activeDomElement && viewElement ) {\n\t\t\t\t\tdoc.getSelection().removeAllRanges();\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes the fake selection.\n\t *\n\t * @private\n\t */\n\t_removeFakeSelection() {\n\t\tconst container = this._fakeSelectionContainer;\n\n\t\tif ( container ) {\n\t\t\tcontainer.remove();\n\t\t}\n\t}\n\n\t/**\n\t * Checks if focus needs to be updated and possibly updates it.\n\t *\n\t * @private\n\t */\n\t_updateFocus() {\n\t\tif ( this.isFocused ) {\n\t\t\tconst editable = this.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t}\n\t\t}\n\t}\n}\n\nmix( Renderer, ObservableMixin );\n\n// Checks if provided element is editable.\n//\n// @private\n// @param {module:engine/view/element~Element} element\n// @returns {Boolean}\nfunction isEditable( element ) {\n\tif ( element.getAttribute( 'contenteditable' ) == 'false' ) {\n\t\treturn false;\n\t}\n\n\tconst parent = element.findAncestor( element => element.hasAttribute( 'contenteditable' ) );\n\n\treturn !parent || parent.getAttribute( 'contenteditable' ) == 'true';\n}\n\n// Adds inline filler at a given position.\n//\n// The position can be given as an array of DOM nodes and an offset in that array,\n// or a DOM parent element and an offset in that element.\n//\n// @private\n// @param {Document} domDocument\n// @param {Element|Array.<Node>} domParentOrArray\n// @param {Number} offset\n// @returns {Text} The DOM text node that contains an inline filler.\nfunction addInlineFiller( domDocument, domParentOrArray, offset ) {\n\tconst childNodes = domParentOrArray instanceof Array ? domParentOrArray : domParentOrArray.childNodes;\n\tconst nodeAfterFiller = childNodes[ offset ];\n\n\tif ( isText( nodeAfterFiller ) ) {\n\t\tnodeAfterFiller.data = INLINE_FILLER + nodeAfterFiller.data;\n\n\t\treturn nodeAfterFiller;\n\t} else {\n\t\tconst fillerNode = domDocument.createTextNode( INLINE_FILLER );\n\n\t\tif ( Array.isArray( domParentOrArray ) ) {\n\t\t\tchildNodes.splice( offset, 0, fillerNode );\n\t\t} else {\n\t\t\tinsertAt( domParentOrArray, offset, fillerNode );\n\t\t}\n\n\t\treturn fillerNode;\n\t}\n}\n\n// Whether two DOM nodes should be considered as similar.\n// Nodes are considered similar if they have the same tag name.\n//\n// @private\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction areSimilar( node1, node2 ) {\n\treturn isNode( node1 ) && isNode( node2 ) &&\n\t\t!isText( node1 ) && !isText( node2 ) &&\n\t\tnode1.tagName.toLowerCase() === node2.tagName.toLowerCase();\n}\n\n// Whether two dom nodes should be considered as the same.\n// Two nodes which are considered the same are:\n//\n//\t\t* Text nodes with the same text.\n//\t\t* Element nodes represented by the same object.\n//\t\t* Two block filler elements.\n//\n// @private\n// @param {Function} blockFiller Block filler creator function, see {@link module:engine/view/domconverter~DomConverter#blockFiller}.\n// @param {Node} node1\n// @param {Node} node2\n// @returns {Boolean}\nfunction sameNodes( blockFiller, actualDomChild, expectedDomChild ) {\n\t// Elements.\n\tif ( actualDomChild === expectedDomChild ) {\n\t\treturn true;\n\t}\n\t// Texts.\n\telse if ( isText( actualDomChild ) && isText( expectedDomChild ) ) {\n\t\treturn actualDomChild.data === expectedDomChild.data;\n\t}\n\t// Block fillers.\n\telse if ( isBlockFiller( actualDomChild, blockFiller ) &&\n\t\tisBlockFiller( expectedDomChild, blockFiller ) ) {\n\t\treturn true;\n\t}\n\n\t// Not matching types.\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window, document */\n\n/**\n * @module utils/dom/global\n */\n\n/**\n * A helper (module) giving an access to the global DOM objects such as `window` and\n * `document`. Accessing these objects using this helper allows easy and bulletproof\n * testing, i.e. stubbing native properties:\n *\n *\t\timport global from 'ckeditor5/utils/dom/global.js';\n *\n *\t\t// This stub will work for any code using global module.\n *\t\ttestUtils.sinon.stub( global, 'window', {\n *\t\t\tinnerWidth: 10000\n *\t\t} );\n *\n *\t\tconsole.log( global.window.innerWidth );\n */\nexport default { window, document };\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/indexof\n */\n\n/**\n * Returns index of the node in the parent element.\n *\n * @param {Node} node Node which index is tested.\n * @returns {Number} Index of the node in the parent element. Returns 0 if node has no parent.\n */\nexport default function indexOf( node ) {\n\tlet index = 0;\n\n\twhile ( node.previousSibling ) {\n\t\tnode = node.previousSibling;\n\t\tindex++;\n\t}\n\n\treturn index;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals Node */\n\n/**\n * @module utils/dom/getancestors\n */\n\n/**\n * Returns all ancestors of given DOM node, starting from the top-most (root). Includes the given node itself. If the\n * node is a part of `DocumentFragment` that `DocumentFragment` will be returned. In contrary, if the node is\n * appended to a `Document`, that `Document` will not be returned (algorithms operating on DOM tree care for `Document#documentElement`\n * at most, which will be returned).\n *\n * @param {Node} node DOM node.\n * @returns {Array.<Node|DocumentFragment>} Array of given `node` parents.\n */\nexport default function getAncestors( node ) {\n\tconst nodes = [];\n\n\t// We are interested in `Node`s `DocumentFragment`s only.\n\twhile ( node && node.nodeType != Node.DOCUMENT_NODE ) {\n\t\tnodes.unshift( node );\n\t\tnode = node.parentNode;\n\t}\n\n\treturn nodes;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/getcommonancestor\n */\n\nimport getAncestors from './getancestors';\n\n/**\n * Searches and returns the lowest common ancestor of two given nodes.\n *\n * @param {Node} nodeA First node.\n * @param {Node} nodeB Second node.\n * @returns {Node|DocumentFragment|Document|null} Lowest common ancestor of both nodes or `null` if nodes do not have a common ancestor.\n */\nexport default function getCommonAncestor( nodeA, nodeB ) {\n\tconst ancestorsA = getAncestors( nodeA );\n\tconst ancestorsB = getAncestors( nodeB );\n\n\tlet i = 0;\n\n\t// It does not matter which array is shorter.\n\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\ti++;\n\t}\n\n\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n}\n","import isObjectLike from './isObjectLike';\nimport isPlainObject from './isPlainObject';\n\n/**\n * Checks if `value` is likely a DOM element.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is a DOM element,\n *  else `false`.\n * @example\n *\n * _.isElement(document.body);\n * // => true\n *\n * _.isElement('<body>');\n * // => false\n */\nfunction isElement(value) {\n  return !!value && value.nodeType === 1 && isObjectLike(value) && !isPlainObject(value);\n}\n\nexport default isElement;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/domconverter\n */\n\n/* globals document, Node, NodeFilter, Text */\n\nimport ViewText from './text';\nimport ViewElement from './element';\nimport ViewPosition from './position';\nimport ViewRange from './range';\nimport ViewSelection from './selection';\nimport ViewDocumentFragment from './documentfragment';\nimport ViewTreeWalker from './treewalker';\nimport { BR_FILLER, INLINE_FILLER_LENGTH, isBlockFiller, isInlineFiller, startsWithFiller, getDataWithoutFiller } from './filler';\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport indexOf from '@ckeditor/ckeditor5-utils/src/dom/indexof';\nimport getAncestors from '@ckeditor/ckeditor5-utils/src/dom/getancestors';\nimport getCommonAncestor from '@ckeditor/ckeditor5-utils/src/dom/getcommonancestor';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\nimport isElement from '@ckeditor/ckeditor5-utils/src/lib/lodash/isElement';\n\n/**\n * DomConverter is a set of tools to do transformations between DOM nodes and view nodes. It also handles\n * {@link module:engine/view/domconverter~DomConverter#bindElements binding} these nodes.\n *\n * DomConverter does not check which nodes should be rendered (use {@link module:engine/view/renderer~Renderer}), does not keep a\n * state of a tree nor keeps synchronization between tree view and DOM tree (use {@link module:engine/view/document~Document}).\n *\n * DomConverter keeps DOM elements to View element bindings, so when the converter will be destroyed, the binding will\n * be lost. Two converters will keep separate binding maps, so one tree view can be bound with two DOM trees.\n */\nexport default class DomConverter {\n\t/**\n\t * Creates DOM converter.\n\t *\n\t * @param {Object} options Object with configuration options.\n\t * @param {Function} [options.blockFiller=module:engine/view/filler~BR_FILLER] Block filler creator.\n\t */\n\tconstructor( options = {} ) {\n\t\t// Using WeakMap prevent memory leaks: when the converter will be destroyed all referenced between View and DOM\n\t\t// will be removed. Also because it is a *Weak*Map when both view and DOM elements will be removed referenced\n\t\t// will be also removed, isn't it brilliant?\n\t\t//\n\t\t// Yes, PJ. It is.\n\t\t//\n\t\t// You guys so smart.\n\t\t//\n\t\t// I've been here. Seen stuff. Afraid of code now.\n\n\t\t/**\n\t\t * Block {@link module:engine/view/filler filler} creator, which is used to create all block fillers during the\n\t\t * view to DOM conversion and to recognize block fillers during the DOM to view conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Function} module:engine/view/domconverter~DomConverter#blockFiller\n\t\t */\n\t\tthis.blockFiller = options.blockFiller || BR_FILLER;\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered pre-formatted elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#preElements\n\t\t */\n\t\tthis.preElements = [ 'pre' ];\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered block elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#blockElements\n\t\t */\n\t\tthis.blockElements = [ 'p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ];\n\n\t\t/**\n\t\t * DOM to View mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_domToViewMapping\n\t\t */\n\t\tthis._domToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * View to DOM mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_viewToDomMapping\n\t\t */\n\t\tthis._viewToDomMapping = new WeakMap();\n\n\t\t/**\n\t\t * Holds mapping between fake selection containers and corresponding view selections.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_fakeSelectionMapping\n\t\t */\n\t\tthis._fakeSelectionMapping = new WeakMap();\n\t}\n\n\t/**\n\t * Binds given DOM element that represents fake selection to {@link module:engine/view/documentselection~DocumentSelection\n\t * document selection}. Document selection copy is stored and can be retrieved by\n\t * {@link module:engine/view/domconverter~DomConverter#fakeSelectionToView} method.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @param {module:engine/view/documentselection~DocumentSelection} viewDocumentSelection\n\t */\n\tbindFakeSelection( domElement, viewDocumentSelection ) {\n\t\tthis._fakeSelectionMapping.set( domElement, new ViewSelection( viewDocumentSelection ) );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/view/selection~Selection view selection} instance corresponding to\n\t * given DOM element that represents fake selection. Returns `undefined` if binding to given DOM element does not exists.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @returns {module:engine/view/selection~Selection|undefined}\n\t */\n\tfakeSelectionToView( domElement ) {\n\t\treturn this._fakeSelectionMapping.get( domElement );\n\t}\n\n\t/**\n\t * Binds DOM and View elements, so it will be possible to get corresponding elements using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {HTMLElement} domElement DOM element to bind.\n\t * @param {module:engine/view/element~Element} viewElement View element to bind.\n\t */\n\tbindElements( domElement, viewElement ) {\n\t\tthis._domToViewMapping.set( domElement, viewElement );\n\t\tthis._viewToDomMapping.set( viewElement, domElement );\n\t}\n\n\t/**\n\t * Unbinds given `domElement` from the view element it was bound to. Unbinding is deep, meaning that all children of\n\t * `domElement` will be unbound too.\n\t *\n\t * @param {HTMLElement} domElement DOM element to unbind.\n\t */\n\tunbindDomElement( domElement ) {\n\t\tconst viewElement = this._domToViewMapping.get( domElement );\n\n\t\tif ( viewElement ) {\n\t\t\tthis._domToViewMapping.delete( domElement );\n\t\t\tthis._viewToDomMapping.delete( viewElement );\n\n\t\t\t// Use Array.from because of MS Edge (#923).\n\t\t\tfor ( const child of Array.from( domElement.childNodes ) ) {\n\t\t\t\tthis.unbindDomElement( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Binds DOM and View document fragments, so it will be possible to get corresponding document fragments using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {DocumentFragment} domFragment DOM document fragment to bind.\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment View document fragment to bind.\n\t */\n\tbindDocumentFragments( domFragment, viewFragment ) {\n\t\tthis._domToViewMapping.set( domFragment, viewFragment );\n\t\tthis._viewToDomMapping.set( viewFragment, domFragment );\n\t}\n\n\t/**\n\t * Converts view to DOM. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View node or document fragment to transform.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @returns {Node|DocumentFragment} Converted node or DocumentFragment.\n\t */\n\tviewToDom( viewNode, domDocument, options = {} ) {\n\t\tif ( viewNode.is( 'text' ) ) {\n\t\t\tconst textData = this._processDataFromViewText( viewNode );\n\n\t\t\treturn domDocument.createTextNode( textData );\n\t\t} else {\n\t\t\tif ( this.mapViewToDom( viewNode ) ) {\n\t\t\t\treturn this.mapViewToDom( viewNode );\n\t\t\t}\n\n\t\t\tlet domElement;\n\n\t\t\tif ( viewNode.is( 'documentFragment' ) ) {\n\t\t\t\t// Create DOM document fragment.\n\t\t\t\tdomElement = domDocument.createDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domElement, viewNode );\n\t\t\t\t}\n\t\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\t\t// UIElement has its own render() method (see #799).\n\t\t\t\tdomElement = viewNode.render( domDocument );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\treturn domElement;\n\t\t\t} else {\n\t\t\t\t// Create DOM element.\n\t\t\t\tdomElement = domDocument.createElement( viewNode.name );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tfor ( const key of viewNode.getAttributeKeys() ) {\n\t\t\t\t\tdomElement.setAttribute( key, viewNode.getAttribute( key ) );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.viewChildrenToDom( viewNode, domDocument, options ) ) {\n\t\t\t\t\tdomElement.appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn domElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the view element to DOM using the\n\t * {@link module:engine/view/domconverter~DomConverter#viewToDom} method.\n\t * Additionally, this method adds block {@link module:engine/view/filler filler} to the list of children, if needed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElement Parent view element.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#viewToDom} options parameter.\n\t * @returns {Iterable.<Node>} DOM nodes.\n\t */\n\t* viewChildrenToDom( viewElement, domDocument, options = {} ) {\n\t\tconst fillerPositionOffset = viewElement.getFillerOffset && viewElement.getFillerOffset();\n\t\tlet offset = 0;\n\n\t\tfor ( const childView of viewElement.getChildren() ) {\n\t\t\tif ( fillerPositionOffset === offset ) {\n\t\t\t\tyield this.blockFiller( domDocument );\n\t\t\t}\n\n\t\t\tyield this.viewToDom( childView, domDocument, options );\n\n\t\t\toffset++;\n\t\t}\n\n\t\tif ( fillerPositionOffset === offset ) {\n\t\t\tyield this.blockFiller( domDocument );\n\t\t}\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/range~Range} to DOM range.\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {Range} DOM range.\n\t */\n\tviewRangeToDom( viewRange ) {\n\t\tconst domStart = this.viewPositionToDom( viewRange.start );\n\t\tconst domEnd = this.viewPositionToDom( viewRange.end );\n\n\t\tconst domRange = document.createRange();\n\t\tdomRange.setStart( domStart.parent, domStart.offset );\n\t\tdomRange.setEnd( domEnd.parent, domEnd.offset );\n\n\t\treturn domRange;\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/position~Position} to DOM parent and offset.\n\t *\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t * If the converted position is directly before inline filler it is moved inside the filler.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {Object|null} position DOM position or `null` if view position could not be converted to DOM.\n\t * @returns {Node} position.parent DOM position parent.\n\t * @returns {Number} position.offset DOM position offset.\n\t */\n\tviewPositionToDom( viewPosition ) {\n\t\tconst viewParent = viewPosition.parent;\n\n\t\tif ( viewParent.is( 'text' ) ) {\n\t\t\tconst domParent = this.findCorrespondingDomText( viewParent );\n\n\t\t\tif ( !domParent ) {\n\t\t\t\t// Position is in a view text node that has not been rendered to DOM yet.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tlet offset = viewPosition.offset;\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset += INLINE_FILLER_LENGTH;\n\t\t\t}\n\n\t\t\treturn { parent: domParent, offset };\n\t\t} else {\n\t\t\t// viewParent is instance of ViewElement.\n\t\t\tlet domParent, domBefore, domAfter;\n\n\t\t\tif ( viewPosition.offset === 0 ) {\n\t\t\t\tdomParent = this.mapViewToDom( viewParent );\n\n\t\t\t\tif ( !domParent ) {\n\t\t\t\t\t// Position is in a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomAfter = domParent.childNodes[ 0 ];\n\t\t\t} else {\n\t\t\t\tconst nodeBefore = viewPosition.nodeBefore;\n\n\t\t\t\tdomBefore = nodeBefore.is( 'text' ) ?\n\t\t\t\t\tthis.findCorrespondingDomText( nodeBefore ) :\n\t\t\t\t\tthis.mapViewToDom( viewPosition.nodeBefore );\n\n\t\t\t\tif ( !domBefore ) {\n\t\t\t\t\t// Position is after a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomParent = domBefore.parentNode;\n\t\t\t\tdomAfter = domBefore.nextSibling;\n\t\t\t}\n\n\t\t\t// If there is an inline filler at position return position inside the filler. We should never return\n\t\t\t// the position before the inline filler.\n\t\t\tif ( isText( domAfter ) && startsWithFiller( domAfter ) ) {\n\t\t\t\treturn { parent: domAfter, offset: INLINE_FILLER_LENGTH };\n\t\t\t}\n\n\t\t\tconst offset = domBefore ? indexOf( domBefore ) + 1 : 0;\n\n\t\t\treturn { parent: domParent, offset };\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM to view. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items. For\n\t * {@link module:engine/view/filler fillers} `null` will be returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {Node|DocumentFragment} domNode DOM node or document fragment to transform.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @param {Boolean} [options.keepOriginalCase=false] If `false`, node's tag name will be converter to lower case.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} Converted node or document fragment\n\t * or `null` if DOM node is a {@link module:engine/view/filler filler} or the given node is an empty text node.\n\t */\n\tdomToView( domNode, options = {} ) {\n\t\tif ( isBlockFiller( domNode, this.blockFiller ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When node is inside UIElement return that UIElement as it's view representation.\n\t\tconst uiElement = this.getParentUIElement( domNode, this._domToViewMapping );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tif ( isText( domNode ) ) {\n\t\t\tif ( isInlineFiller( domNode ) ) {\n\t\t\t\treturn null;\n\t\t\t} else {\n\t\t\t\tconst textData = this._processDataFromDomText( domNode );\n\n\t\t\t\treturn textData === '' ? null : new ViewText( textData );\n\t\t\t}\n\t\t} else if ( this.isComment( domNode ) ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\tif ( this.mapDomToView( domNode ) ) {\n\t\t\t\treturn this.mapDomToView( domNode );\n\t\t\t}\n\n\t\t\tlet viewElement;\n\n\t\t\tif ( this.isDocumentFragment( domNode ) ) {\n\t\t\t\t// Create view document fragment.\n\t\t\t\tviewElement = new ViewDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domNode, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Create view element.\n\t\t\t\tconst viewName = options.keepOriginalCase ? domNode.tagName : domNode.tagName.toLowerCase();\n\t\t\t\tviewElement = new ViewElement( viewName );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domNode, viewElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tconst attrs = domNode.attributes;\n\n\t\t\t\tfor ( let i = attrs.length - 1; i >= 0; i-- ) {\n\t\t\t\t\tviewElement._setAttribute( attrs[ i ].name, attrs[ i ].value );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.domChildrenToView( domNode, options ) ) {\n\t\t\t\t\tviewElement._appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn viewElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the DOM element to view nodes using\n\t * the {@link module:engine/view/domconverter~DomConverter#domToView} method.\n\t * Additionally this method omits block {@link module:engine/view/filler filler}, if it exists in the DOM parent.\n\t *\n\t * @param {HTMLElement} domElement Parent DOM element.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#domToView} options parameter.\n\t * @returns {Iterable.<module:engine/view/node~Node>} View nodes.\n\t */\n\t* domChildrenToView( domElement, options = {} ) {\n\t\tfor ( let i = 0; i < domElement.childNodes.length; i++ ) {\n\t\t\tconst domChild = domElement.childNodes[ i ];\n\t\t\tconst viewChild = this.domToView( domChild, options );\n\n\t\t\tif ( viewChild !== null ) {\n\t\t\t\tyield viewChild;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM selection to view {@link module:engine/view/selection~Selection}.\n\t * Ranges which cannot be converted will be omitted.\n\t *\n\t * @param {Selection} domSelection DOM selection.\n\t * @returns {module:engine/view/selection~Selection} View selection.\n\t */\n\tdomSelectionToView( domSelection ) {\n\t\t// DOM selection might be placed in fake selection container.\n\t\t// If container contains fake selection - return corresponding view selection.\n\t\tif ( domSelection.rangeCount === 1 ) {\n\t\t\tlet container = domSelection.getRangeAt( 0 ).startContainer;\n\n\t\t\t// The DOM selection might be moved to the text node inside the fake selection container.\n\t\t\tif ( isText( container ) ) {\n\t\t\t\tcontainer = container.parentNode;\n\t\t\t}\n\n\t\t\tconst viewSelection = this.fakeSelectionToView( container );\n\n\t\t\tif ( viewSelection ) {\n\t\t\t\treturn viewSelection;\n\t\t\t}\n\t\t}\n\n\t\tconst isBackward = this.isDomSelectionBackward( domSelection );\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( let i = 0; i < domSelection.rangeCount; i++ ) {\n\t\t\t// DOM Range have correct start and end, no matter what is the DOM Selection direction. So we don't have to fix anything.\n\t\t\tconst domRange = domSelection.getRangeAt( i );\n\t\t\tconst viewRange = this.domRangeToView( domRange );\n\n\t\t\tif ( viewRange ) {\n\t\t\t\tviewRanges.push( viewRange );\n\t\t\t}\n\t\t}\n\n\t\treturn new ViewSelection( viewRanges, { backward: isBackward } );\n\t}\n\n\t/**\n\t * Converts DOM Range to view {@link module:engine/view/range~Range}.\n\t * If the start or end position can not be converted `null` is returned.\n\t *\n\t * @param {Range} domRange DOM range.\n\t * @returns {module:engine/view/range~Range|null} View range.\n\t */\n\tdomRangeToView( domRange ) {\n\t\tconst viewStart = this.domPositionToView( domRange.startContainer, domRange.startOffset );\n\t\tconst viewEnd = this.domPositionToView( domRange.endContainer, domRange.endOffset );\n\n\t\tif ( viewStart && viewEnd ) {\n\t\t\treturn new ViewRange( viewStart, viewEnd );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts DOM parent and offset to view {@link module:engine/view/position~Position}.\n\t *\n\t * If the position is inside a {@link module:engine/view/filler filler} which has no corresponding view node,\n\t * position of the filler will be converted and returned.\n\t *\n\t * If the position is inside DOM element rendered by {@link module:engine/view/uielement~UIElement}\n\t * that position will be converted to view position before that UIElement.\n\t *\n\t * If structures are too different and it is not possible to find corresponding position then `null` will be returned.\n\t *\n\t * @param {Node} domParent DOM position parent.\n\t * @param {Number} domOffset DOM position offset.\n\t * @returns {module:engine/view/position~Position} viewPosition View position.\n\t */\n\tdomPositionToView( domParent, domOffset ) {\n\t\tif ( isBlockFiller( domParent, this.blockFiller ) ) {\n\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t}\n\n\t\t// If position is somewhere inside UIElement - return position before that element.\n\t\tconst viewElement = this.mapDomToView( domParent );\n\n\t\tif ( viewElement && viewElement.is( 'uiElement' ) ) {\n\t\t\treturn ViewPosition.createBefore( viewElement );\n\t\t}\n\n\t\tif ( isText( domParent ) ) {\n\t\t\tif ( isInlineFiller( domParent ) ) {\n\t\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t\t}\n\n\t\t\tconst viewParent = this.findCorrespondingViewText( domParent );\n\t\t\tlet offset = domOffset;\n\n\t\t\tif ( !viewParent ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset -= INLINE_FILLER_LENGTH;\n\t\t\t\toffset = offset < 0 ? 0 : offset;\n\t\t\t}\n\n\t\t\treturn new ViewPosition( viewParent, offset );\n\t\t}\n\t\t// domParent instanceof HTMLElement.\n\t\telse {\n\t\t\tif ( domOffset === 0 ) {\n\t\t\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t\t\tif ( viewParent ) {\n\t\t\t\t\treturn new ViewPosition( viewParent, 0 );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst domBefore = domParent.childNodes[ domOffset - 1 ];\n\t\t\t\tconst viewBefore = isText( domBefore ) ?\n\t\t\t\t\tthis.findCorrespondingViewText( domBefore ) :\n\t\t\t\t\tthis.mapDomToView( domBefore );\n\n\t\t\t\t// TODO #663\n\t\t\t\tif ( viewBefore && viewBefore.parent ) {\n\t\t\t\t\treturn new ViewPosition( viewBefore.parent, viewBefore.index + 1 );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns corresponding view {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment} for provided DOM element or\n\t * document fragment. If there is no view item {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * to the given DOM - `undefined` is returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {DocumentFragment|Element} domElementOrDocumentFragment DOM element or document fragment.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|undefined}\n\t * Corresponding view element, document fragment or `undefined` if no element was bound.\n\t */\n\tmapDomToView( domElementOrDocumentFragment ) {\n\t\treturn this.getParentUIElement( domElementOrDocumentFragment ) || this._domToViewMapping.get( domElementOrDocumentFragment );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * For all text nodes rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * Note that for the block or inline {@link module:engine/view/filler filler} this method returns `null`.\n\t *\n\t * @param {Text} domText DOM text node.\n\t * @returns {module:engine/view/text~Text|null} Corresponding view text node or `null`, if it was not possible to find a\n\t * corresponding node.\n\t */\n\tfindCorrespondingViewText( domText ) {\n\t\tif ( isInlineFiller( domText ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// If DOM text was rendered by UIElement - return that element.\n\t\tconst uiElement = this.getParentUIElement( domText );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tconst previousSibling = domText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling ) {\n\t\t\tif ( !( this.isElement( previousSibling ) ) ) {\n\t\t\t\t// The previous is text or comment.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewElement = this.mapDomToView( previousSibling );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst nextSibling = viewElement.nextSibling;\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( nextSibling instanceof ViewText ) {\n\t\t\t\t\treturn viewElement.nextSibling;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Try to use parent to find the corresponding text node.\n\t\telse {\n\t\t\tconst viewElement = this.mapDomToView( domText.parentNode );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst firstChild = viewElement.getChild( 0 );\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( firstChild instanceof ViewText ) {\n\t\t\t\t\treturn firstChild;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns corresponding DOM item for provided {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment}.\n\t * To find a corresponding text for {@link module:engine/view/text~Text view Text instance}\n\t * use {@link #findCorrespondingDomText}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View element or document fragment.\n\t * @returns {Node|DocumentFragment|undefined} Corresponding DOM node or document fragment.\n\t */\n\tmapViewToDom( documentFragmentOrElement ) {\n\t\treturn this._viewToDomMapping.get( documentFragmentOrElement );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} viewText View text node.\n\t * @returns {Text|null} Corresponding DOM text node or `null`, if it was not possible to find a corresponding node.\n\t */\n\tfindCorrespondingDomText( viewText ) {\n\t\tconst previousSibling = viewText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling && this.mapViewToDom( previousSibling ) ) {\n\t\t\treturn this.mapViewToDom( previousSibling ).nextSibling;\n\t\t}\n\n\t\t// If this is a first node, try to use parent to find the corresponding text node.\n\t\tif ( !previousSibling && viewText.parent && this.mapViewToDom( viewText.parent ) ) {\n\t\t\treturn this.mapViewToDom( viewText.parent ).childNodes[ 0 ];\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Focuses DOM editable that is corresponding to provided {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t * @param {module:engine/view/editableelement~EditableElement} viewEditable\n\t */\n\tfocus( viewEditable ) {\n\t\tconst domEditable = this.mapViewToDom( viewEditable );\n\n\t\tif ( domEditable && domEditable.ownerDocument.activeElement !== domEditable ) {\n\t\t\t// Save the scrollX and scrollY positions before the focus.\n\t\t\tconst { scrollX, scrollY } = global.window;\n\t\t\tconst scrollPositions = [];\n\n\t\t\t// Save all scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst { scrollLeft, scrollTop } = node;\n\n\t\t\t\tscrollPositions.push( [ scrollLeft, scrollTop ] );\n\t\t\t} );\n\n\t\t\tdomEditable.focus();\n\n\t\t\t// Restore scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/957\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst [ scrollLeft, scrollTop ] = scrollPositions.shift();\n\n\t\t\t\tnode.scrollLeft = scrollLeft;\n\t\t\t\tnode.scrollTop = scrollTop;\n\t\t\t} );\n\n\t\t\t// Restore the scrollX and scrollY positions after the focus.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\tglobal.window.scrollTo( scrollX, scrollY );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.ELEMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisElement( node ) {\n\t\treturn node && node.nodeType == Node.ELEMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.DOCUMENT_FRAGMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisDocumentFragment( node ) {\n\t\treturn node && node.nodeType == Node.DOCUMENT_FRAGMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.COMMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisComment( node ) {\n\t\treturn node && node.nodeType == Node.COMMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` if given selection is a backward selection, that is, if it's `focus` is before `anchor`.\n\t *\n\t * @param {Selection} DOM Selection instance to check.\n\t * @returns {Boolean}\n\t */\n\tisDomSelectionBackward( selection ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Since it takes multiple lines of code to check whether a \"DOM Position\" is before/after another \"DOM Position\",\n\t\t// we will use the fact that range will collapse if it's end is before it's start.\n\t\tconst range = document.createRange();\n\n\t\trange.setStart( selection.anchorNode, selection.anchorOffset );\n\t\trange.setEnd( selection.focusNode, selection.focusOffset );\n\n\t\tconst backward = range.collapsed;\n\n\t\trange.detach();\n\n\t\treturn backward;\n\t}\n\n\t/**\n\t * Returns parent {@link module:engine/view/uielement~UIElement} for provided DOM node. Returns `null` if there is no\n\t * parent UIElement.\n\t *\n\t * @param {Node} domNode\n\t * @returns {module:engine/view/uielement~UIElement|null}\n\t */\n\tgetParentUIElement( domNode ) {\n\t\tconst ancestors = getAncestors( domNode );\n\n\t\t// Remove domNode from the list.\n\t\tancestors.pop();\n\n\t\twhile ( ancestors.length ) {\n\t\t\tconst domNode = ancestors.pop();\n\t\t\tconst viewNode = this._domToViewMapping.get( domNode );\n\n\t\t\tif ( viewNode && viewNode.is( 'uiElement' ) ) {\n\t\t\t\treturn viewNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks if given selection's boundaries are at correct places.\n\t *\n\t * The following places are considered as incorrect for selection boundaries:\n\t * * before or in the middle of the inline filler sequence,\n\t * * inside the DOM element which represents {@link module:engine/view/uielement~UIElement a view ui element}.\n\t *\n\t * @param {Selection} domSelection DOM Selection object to be checked.\n\t * @returns {Boolean} `true` if the given selection is at a correct place, `false` otherwise.\n\t */\n\tisDomSelectionCorrect( domSelection ) {\n\t\treturn this._isDomSelectionPositionCorrect( domSelection.anchorNode, domSelection.anchorOffset ) &&\n\t\t\tthis._isDomSelectionPositionCorrect( domSelection.focusNode, domSelection.focusOffset );\n\t}\n\n\t/**\n\t * Checks if the given DOM position is a correct place for selection boundary. See {@link #isDomSelectionCorrect}.\n\t *\n\t * @private\n\t * @param {Element} domParent Position parent.\n\t * @param {Number} offset Position offset.\n\t * @returns {Boolean} `true` if given position is at a correct place for selection boundary, `false` otherwise.\n\t */\n\t_isDomSelectionPositionCorrect( domParent, offset ) {\n\t\t// If selection is before or in the middle of inline filler string, it is incorrect.\n\t\tif ( isText( domParent ) && startsWithFiller( domParent ) && offset < INLINE_FILLER_LENGTH ) {\n\t\t\t// Selection in a text node, at wrong position (before or in the middle of filler).\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isElement( domParent ) && startsWithFiller( domParent.childNodes[ offset ] ) ) {\n\t\t\t// Selection in an element node, before filler text node.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t// If selection is in `view.UIElement`, it is incorrect. Note that `mapDomToView()` returns `view.UIElement`\n\t\t// also for any dom element that is inside the view ui element (so we don't need to perform any additional checks).\n\t\tif ( viewParent && viewParent.is( 'uiElement' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Takes text data from a given {@link module:engine/view/text~Text#data} and processes it so\n\t * it is correctly displayed in the DOM.\n\t *\n\t * Following changes are done:\n\t *\n\t * * a space at the beginning is changed to `&nbsp;` if this is the first text node in its container\n\t * element or if a previous text node ends with a space character,\n\t * * space at the end of the text node is changed to `&nbsp;` if this is the last text node in its container,\n\t * * remaining spaces are replaced to a chain of spaces and `&nbsp;` (e.g. `'x   x'` becomes `'x &nbsp; x'`).\n\t *\n\t * Content of {@link #preElements} is not processed.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node View text node to process.\n\t * @returns {String} Processed text data.\n\t */\n\t_processDataFromViewText( node ) {\n\t\tlet data = node.data;\n\n\t\t// If any of node ancestors has a name which is in `preElements` array, then currently processed\n\t\t// view text node is (will be) in preformatted element. We should not change whitespaces then.\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn data;\n\t\t}\n\n\t\t// 1. Replace the first space with a nbsp if the previous node ends with a space or there is no previous node\n\t\t// (container element boundary).\n\t\tif ( data.charAt( 0 ) == ' ' ) {\n\t\t\tconst prevNode = this._getTouchingViewTextNode( node, false );\n\t\t\tconst prevEndsWithSpace = prevNode && this._nodeEndsWithSpace( prevNode );\n\n\t\t\tif ( prevEndsWithSpace || !prevNode ) {\n\t\t\t\tdata = '\\u00A0' + data.substr( 1 );\n\t\t\t}\n\t\t}\n\n\t\t// 2. Replace the last space with a nbsp if this is the last text node (container element boundary).\n\t\tif ( data.charAt( data.length - 1 ) == ' ' ) {\n\t\t\tconst nextNode = this._getTouchingViewTextNode( node, true );\n\n\t\t\tif ( !nextNode ) {\n\t\t\t\tdata = data.substr( 0, data.length - 1 ) + '\\u00A0';\n\t\t\t}\n\t\t}\n\n\t\treturn data.replace( / {2}/g, ' \\u00A0' );\n\t}\n\n\t/**\n\t * Checks whether given node ends with a space character after changing appropriate space characters to `&nbsp;`s.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Node to check.\n\t * @returns {Boolean} `true` if given `node` ends with space, `false` otherwise.\n\t */\n\t_nodeEndsWithSpace( node ) {\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst data = this._processDataFromViewText( node );\n\n\t\treturn data.charAt( data.length - 1 ) == ' ';\n\t}\n\n\t/**\n\t * Takes text data from native `Text` node and processes it to a correct {@link module:engine/view/text~Text view text node} data.\n\t *\n\t * Following changes are done:\n\t *\n\t * * multiple whitespaces are replaced to a single space,\n\t * * space at the beginning of a text node is removed if it is the first text node in its container\n\t * element or if the previous text node ends with a space character,\n\t * * space at the end of the text node is removed, if it is the last text node in its container.\n\t *\n\t * @param {Node} node DOM text node to process.\n\t * @returns {String} Processed data.\n\t * @private\n\t */\n\t_processDataFromDomText( node ) {\n\t\tlet data = node.data;\n\n\t\tif ( _hasDomParentOfType( node, this.preElements ) ) {\n\t\t\treturn getDataWithoutFiller( node );\n\t\t}\n\n\t\t// Change all consecutive whitespace characters (from the [ \\n\\t\\r] set –\n\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/822#issuecomment-311670249) to a single space character.\n\t\t// That's how multiple whitespaces are treated when rendered, so we normalize those whitespaces.\n\t\t// We're replacing 1+ (and not 2+) to also normalize singular \\n\\t\\r characters (#822).\n\t\tdata = data.replace( /[ \\n\\t\\r]{1,}/g, ' ' );\n\n\t\tconst prevNode = this._getTouchingInlineDomNode( node, false );\n\t\tconst nextNode = this._getTouchingInlineDomNode( node, true );\n\n\t\tconst shouldLeftTrim = this._checkShouldLeftTrimDomText( prevNode );\n\t\tconst shouldRightTrim = this._checkShouldRightTrimDomText( node, nextNode );\n\n\t\t// If the previous dom text node does not exist or it ends by whitespace character, remove space character from the beginning\n\t\t// of this text node. Such space character is treated as a whitespace.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^ /, '' );\n\t\t}\n\n\t\t// If the next text node does not exist remove space character from the end of this text node.\n\t\tif ( shouldRightTrim ) {\n\t\t\tdata = data.replace( / $/, '' );\n\t\t}\n\n\t\t// At the beginning and end of a block element, Firefox inserts normal space + <br> instead of non-breaking space.\n\t\t// This means that the text node starts/end with normal space instead of non-breaking space.\n\t\t// This causes a problem because the normal space would be removed in `.replace` calls above. To prevent that,\n\t\t// the inline filler is removed only after the data is initially processed (by the `.replace` above). See ckeditor5#692.\n\t\tdata = getDataWithoutFiller( new Text( data ) );\n\n\t\t// At this point we should have removed all whitespaces from DOM text data.\n\n\t\t// Now we have to change &nbsp; chars, that were in DOM text data because of rendering reasons, to spaces.\n\t\t// First, change all ` \\u00A0` pairs (space + &nbsp;) to two spaces. DOM converter changes two spaces from model/view as\n\t\t// ` \\u00A0` to ensure proper rendering. Since here we convert back, we recognize those pairs and change them\n\t\t// to `  ` which is what we expect to have in model/view.\n\t\tdata = data.replace( / \\u00A0/g, '  ' );\n\n\t\t// Then, change &nbsp; character that is at the beginning of the text node to space character.\n\t\t// As above, that &nbsp; was created for rendering reasons but it's real meaning is just a space character.\n\t\t// We do that replacement only if this is the first node or the previous node ends on whitespace character.\n\t\tif ( shouldLeftTrim ) {\n\t\t\tdata = data.replace( /^\\u00A0/, ' ' );\n\t\t}\n\n\t\t// Since input text data could be: `x_ _`, we would not replace the first &nbsp; after `x` character.\n\t\t// We have to fix it. Since we already change all ` &nbsp;`, we will have something like this at the end of text data:\n\t\t// `x_ _ _` -> `x_    `. Find &nbsp; at the end of string (can be followed only by spaces).\n\t\t// We do that replacement only if this is the last node or the next node starts with &nbsp; or is a <br>.\n\t\tif ( isText( nextNode ) ? nextNode.data.charAt( 0 ) == '\\u00A0' : true ) {\n\t\t\tdata = data.replace( /\\u00A0( *)$/, ' $1' );\n\t\t}\n\n\t\t// At this point, all whitespaces should be removed and all &nbsp; created for rendering reasons should be\n\t\t// changed to normal space. All left &nbsp; are &nbsp; inserted intentionally.\n\t\treturn data;\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, preceded by the given `prevNode` should\n\t * be trimmed from the left side.\n\t *\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldLeftTrimDomText( prevNode ) {\n\t\tif ( !prevNode ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( isElement( prevNode ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\treturn /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) );\n\t}\n\n\t/**\n\t * Helper function which checks if a DOM text node, succeeded by the given `nextNode` should\n\t * be trimmed from the right side.\n\t *\n\t * @param {Node} node\n\t * @param {Node} prevNode\n\t */\n\t_checkShouldRightTrimDomText( node, nextNode ) {\n\t\tif ( nextNode ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !startsWithFiller( node );\n\t}\n\n\t/**\n\t * Helper function. For given {@link module:engine/view/text~Text view text node}, it finds previous or next sibling\n\t * that is contained in the same container element. If there is no such sibling, `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} node Reference node.\n\t * @param {Boolean} getNext\n\t * @returns {module:engine/view/text~Text|null} Touching text node or `null` if there is no next or previous touching text node.\n\t */\n\t_getTouchingViewTextNode( node, getNext ) {\n\t\tconst treeWalker = new ViewTreeWalker( {\n\t\t\tstartPosition: getNext ? ViewPosition.createAfter( node ) : ViewPosition.createBefore( node ),\n\t\t\tdirection: getNext ? 'forward' : 'backward'\n\t\t} );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\t// ViewContainerElement is found on a way to next ViewText node, so given `node` was first/last\n\t\t\t// text node in its container element.\n\t\t\tif ( value.item.is( 'containerElement' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// <br> found – it works like a block boundary, so do not scan further.\n\t\t\telse if ( value.item.is( 'br' ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t\t// Found a text node in the same container element.\n\t\t\telse if ( value.item.is( 'textProxy' ) ) {\n\t\t\t\treturn value.item;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Helper function. For the given text node, it finds the closest touching node which is either\n\t * a text node or a `<br>`. The search is terminated at block element boundaries and if a matching node\n\t * wasn't found so far, `null` is returned.\n\t *\n\t * In the following DOM structure:\n\t *\n\t *\t\t<p>foo<b>bar</b><br>bom</p>\n\t *\n\t * * `foo` doesn't have its previous touching inline node (`null` is returned),\n\t * * `foo`'s next touching inline node is `bar`\n\t * * `bar`'s next touching inline node is `<br>`\n\t *\n\t * This method returns text nodes and `<br>` elements because these types of nodes affect how\n\t * spaces in the given text node need to be converted.\n\t *\n\t * @private\n\t * @param {Text} node\n\t * @param {Boolean} getNext\n\t * @returns {Text|Element|null}\n\t */\n\t_getTouchingInlineDomNode( node, getNext ) {\n\t\tif ( !node.parentNode ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst direction = getNext ? 'nextNode' : 'previousNode';\n\t\tconst document = node.ownerDocument;\n\t\tconst topmostParent = getAncestors( node )[ 0 ];\n\n\t\tconst treeWalker = document.createTreeWalker( topmostParent, NodeFilter.SHOW_TEXT | NodeFilter.SHOW_ELEMENT, {\n\t\t\tacceptNode( node ) {\n\t\t\t\tif ( isText( node ) ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\tif ( node.tagName == 'BR' ) {\n\t\t\t\t\treturn NodeFilter.FILTER_ACCEPT;\n\t\t\t\t}\n\n\t\t\t\treturn NodeFilter.FILTER_SKIP;\n\t\t\t}\n\t\t} );\n\n\t\ttreeWalker.currentNode = node;\n\n\t\tconst touchingNode = treeWalker[ direction ]();\n\n\t\tif ( touchingNode !== null ) {\n\t\t\tconst lca = getCommonAncestor( node, touchingNode );\n\n\t\t\t// If there is common ancestor between the text node and next/prev text node,\n\t\t\t// and there are no block elements on a way from the text node to that ancestor,\n\t\t\t// and there are no block elements on a way from next/prev text node to that ancestor...\n\t\t\tif (\n\t\t\t\tlca &&\n\t\t\t\t!_hasDomParentOfType( node, this.blockElements, lca ) &&\n\t\t\t\t!_hasDomParentOfType( touchingNode, this.blockElements, lca )\n\t\t\t) {\n\t\t\t\t// Then they are in the same container element.\n\t\t\t\treturn touchingNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Helper function.\n// Used to check if given native `Element` or `Text` node has parent with tag name from `types` array.\n//\n// @param {Node} node\n// @param {Array.<String>} types\n// @param {Boolean} [boundaryParent] Can be given if parents should be checked up to a given element (excluding that element).\n// @returns {Boolean} `true` if such parent exists or `false` if it does not.\nfunction _hasDomParentOfType( node, types, boundaryParent ) {\n\tlet parents = getAncestors( node );\n\n\tif ( boundaryParent ) {\n\t\tparents = parents.slice( parents.indexOf( boundaryParent ) + 1 );\n\t}\n\n\treturn parents.some( parent => parent.tagName && types.includes( parent.tagName.toLowerCase() ) );\n}\n\n// A helper that executes given callback for each DOM node's ancestor, starting from the given node\n// and ending in document#documentElement.\n//\n// @param {Node} node\n// @param {Function} callback A callback to be executed for each ancestor.\nfunction forEachDomNodeAncestor( node, callback ) {\n\twhile ( node && node != global.document ) {\n\t\tcallback( node );\n\t\tnode = node.parentNode;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/iswindow\n */\n\n/**\n * Checks if the object is a native DOM Window.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isWindow( obj ) {\n\tconst stringifiedObject = Object.prototype.toString.apply( obj );\n\n\t// Returns `true` for the `window` object in browser environments.\n\tif ( stringifiedObject == '[object Window]' ) {\n\t\treturn true;\n\t}\n\n\t// Returns `true` for the `window` object in the Electron environment.\n\tif ( stringifiedObject == '[object global]' ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/emittermixin\n */\n\nimport { default as EmitterMixin, _getEmitterListenedTo, _setEmitterId } from '../emittermixin';\nimport uid from '../uid';\nimport extend from '../lib/lodash/extend';\nimport isNode from './isnode';\nimport isWindow from './iswindow';\n\n/**\n * Mixin that injects the DOM events API into its host. It provides the API\n * compatible with {@link module:utils/emittermixin~EmitterMixin}.\n *\n * DOM emitter mixin is by default available in the {@link module:ui/view~View} class,\n * but it can also be mixed into any other class:\n *\n *\t\timport mix from '../utils/mix.js';\n *\t\timport DomEmitterMixin from '../utils/dom/emittermixin.js';\n *\n *\t\tclass SomeView {}\n *\t\tmix( SomeView, DomEmitterMixin );\n *\n *\t\tconst view = new SomeView();\n *\t\tview.listenTo( domElement, ( evt, domEvt ) => {\n *\t\t\tconsole.log( evt, domEvt );\n *\t\t} );\n *\n * @mixin EmitterMixin\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n */\nconst DomEmitterMixin = extend( {}, EmitterMixin, {\n\t/**\n\t * Registers a callback function to be executed when an event is fired in a specific Emitter or DOM Node.\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} emitter The object that fires the event.\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of this event callback. The higher\n\t * the priority value the sooner the callback will be fired. Events having the same priority are called in the\n\t * order they were added.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t */\n\tlistenTo( emitter, ...rest ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with\n\t\t// corresponding ProxyEmitter (or create one if not existing).\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter ) || new ProxyEmitter( emitter );\n\n\t\t\tproxy.attach( ...rest );\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.listenTo.call( this, emitter, ...rest );\n\t},\n\n\t/**\n\t * Stops listening for events. It can be used at different levels:\n\t * It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#listenTo}.\n\t *\n\t * * To stop listening to a specific callback.\n\t * * To stop listening to a specific event.\n\t * * To stop listening to all events fired by a specific object.\n\t * * To stop listening to all events fired by all object.\n\t *\n\t * @param {module:utils/emittermixin~Emitter|Node} [emitter] The object to stop listening to. If omitted, stops it for all objects.\n\t * @param {String} [event] (Requires the `emitter`) The name of the event to stop listening to. If omitted, stops it\n\t * for all events from `emitter`.\n\t * @param {Function} [callback] (Requires the `event`) The function to be removed from the call list for the given\n\t * `event`.\n\t */\n\tstopListening( emitter, event, callback ) {\n\t\t// Check if emitter is an instance of DOM Node. If so, replace the argument with corresponding ProxyEmitter.\n\t\tif ( isNode( emitter ) || isWindow( emitter ) ) {\n\t\t\tconst proxy = this._getProxyEmitter( emitter );\n\n\t\t\t// Element has no listeners.\n\t\t\tif ( !proxy ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\temitter = proxy;\n\t\t}\n\n\t\t// Execute parent class method with Emitter (or ProxyEmitter) instance.\n\t\tEmitterMixin.stopListening.call( this, emitter, event, callback );\n\n\t\tif ( emitter instanceof ProxyEmitter ) {\n\t\t\temitter.detach( event );\n\t\t}\n\t},\n\n\t/**\n\t * Retrieves ProxyEmitter instance for given DOM Node residing in this Host.\n\t *\n\t * @pivate\n\t * @param {Node} node DOM Node of the ProxyEmitter.\n\t * @returns {module:utils/dom/emittermixin~ProxyEmitter} ProxyEmitter instance or null.\n\t */\n\t_getProxyEmitter( node ) {\n\t\treturn _getEmitterListenedTo( this, getNodeUID( node ) );\n\t}\n} );\n\nexport default DomEmitterMixin;\n\n/**\n * Creates a ProxyEmitter instance. Such an instance is a bridge between a DOM Node firing events\n * and any Host listening to them. It is backwards compatible with {@link module:utils/emittermixin~EmitterMixin#on}.\n *\n *                                  listenTo( click, ... )\n *                    +-----------------------------------------+\n *                    |              stopListening( ... )       |\n *     +----------------------------+                           |             addEventListener( click, ... )\n *     | Host                       |                           |   +---------------------------------------------+\n *     +----------------------------+                           |   |       removeEventListener( click, ... )     |\n *     | _listeningTo: {            |                +----------v-------------+                                   |\n *     |   UID: {                   |                | ProxyEmitter           |                                   |\n *     |     emitter: ProxyEmitter, |                +------------------------+                      +------------v----------+\n *     |     callbacks: {           |                | events: {              |                      | Node (HTMLElement)    |\n *     |       click: [ callbacks ] |                |   click: [ callbacks ] |                      +-----------------------+\n *     |     }                      |                | },                     |                      | data-ck-expando: UID  |\n *     |   }                        |                | _domNode: Node,        |                      +-----------------------+\n *     | }                          |                | _domListeners: {},     |                                   |\n *     | +------------------------+ |                | _emitterId: UID        |                                   |\n *     | | DomEmitterMixin        | |                +--------------^---------+                                   |\n *     | +------------------------+ |                           |   |                                             |\n *     +--------------^-------------+                           |   +---------------------------------------------+\n *                    |                                         |                  click (DOM Event)\n *                    +-----------------------------------------+\n *                                fire( click, DOM Event )\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @implements module:utils/dom/emittermixin~Emitter\n * @private\n */\nclass ProxyEmitter {\n\t/**\n\t * @param {Node} node DOM Node that fires events.\n\t * @returns {Object} ProxyEmitter instance bound to the DOM Node.\n\t */\n\tconstructor( node ) {\n\t\t// Set emitter ID to match DOM Node \"expando\" property.\n\t\t_setEmitterId( this, getNodeUID( node ) );\n\n\t\t// Remember the DOM Node this ProxyEmitter is bound to.\n\t\tthis._domNode = node;\n\t}\n}\n\nextend( ProxyEmitter.prototype, EmitterMixin, {\n\t/**\n\t * Collection of native DOM listeners.\n\t *\n\t * @private\n\t * @member {Object} module:utils/dom/emittermixin~ProxyEmitter#_domListeners\n\t */\n\n\t/**\n\t * Registers a callback function to be executed when an event is fired.\n\t *\n\t * It attaches a native DOM listener to the DOM Node. When fired,\n\t * a corresponding Emitter event will also fire with DOM Event object as an argument.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#attach\n\t * @param {String} event The name of the event.\n\t * @param {Function} callback The function to be called on event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {Boolean} [options.useCapture=false] Indicates that events of this type will be dispatched to the registered\n\t * listener before being dispatched to any EventTarget beneath it in the DOM tree.\n\t */\n\tattach( event, callback, options = {} ) {\n\t\t// If the DOM Listener for given event already exist it is pointless\n\t\t// to attach another one.\n\t\tif ( this._domListeners && this._domListeners[ event ] ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domListener = this._createDomListener( event, !!options.useCapture );\n\n\t\t// Attach the native DOM listener to DOM Node.\n\t\tthis._domNode.addEventListener( event, domListener, !!options.useCapture );\n\n\t\tif ( !this._domListeners ) {\n\t\t\tthis._domListeners = {};\n\t\t}\n\n\t\t// Store the native DOM listener in this ProxyEmitter. It will be helpful\n\t\t// when stopping listening to the event.\n\t\tthis._domListeners[ event ] = domListener;\n\t},\n\n\t/**\n\t * Stops executing the callback on the given event.\n\t *\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#detach\n\t * @param {String} event The name of the event.\n\t */\n\tdetach( event ) {\n\t\tlet events;\n\n\t\t// Remove native DOM listeners which are orphans. If no callbacks\n\t\t// are awaiting given event, detach native DOM listener from DOM Node.\n\t\t// See: {@link attach}.\n\n\t\tif ( this._domListeners[ event ] && ( !( events = this._events[ event ] ) || !events.callbacks.length ) ) {\n\t\t\tthis._domListeners[ event ].removeListener();\n\t\t}\n\t},\n\n\t/**\n\t * Creates a native DOM listener callback. When the native DOM event\n\t * is fired it will fire corresponding event on this ProxyEmitter.\n\t * Note: A native DOM Event is passed as an argument.\n\t *\n\t * @private\n\t * @method module:utils/dom/emittermixin~ProxyEmitter#_createDomListener\n\t * @param {String} event The name of the event.\n\t * @param {Boolean} useCapture Indicates whether the listener was created for capturing event.\n\t * @returns {Function} The DOM listener callback.\n\t */\n\t_createDomListener( event, useCapture ) {\n\t\tconst domListener = domEvt => {\n\t\t\tthis.fire( event, domEvt );\n\t\t};\n\n\t\t// Supply the DOM listener callback with a function that will help\n\t\t// detach it from the DOM Node, when it is no longer necessary.\n\t\t// See: {@link detach}.\n\t\tdomListener.removeListener = () => {\n\t\t\tthis._domNode.removeEventListener( event, domListener, useCapture );\n\t\t\tdelete this._domListeners[ event ];\n\t\t};\n\n\t\treturn domListener;\n\t}\n} );\n\n// Gets an unique DOM Node identifier. The identifier will be set if not defined.\n//\n// @private\n// @param {Node} node\n// @returns {String} UID for given DOM Node.\nfunction getNodeUID( node ) {\n\treturn node[ 'data-ck-expando' ] || ( node[ 'data-ck-expando' ] = uid() );\n}\n\n/**\n * Interface representing classes which mix in {@link module:utils/dom/emittermixin~EmitterMixin}.\n *\n * @interface Emitter\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/observer\n */\n\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Abstract base observer class. Observers are classes which listen to DOM events, do the preliminary\n * processing and fire events on the {@link module:engine/view/document~Document} objects.\n * Observers can also add features to the view, for instance by updating its status or marking elements\n * which need refresh on DOM events.\n *\n * @abstract\n */\nexport default class Observer {\n\t/**\n\t * Creates an instance of the observer.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/document~Document} object.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document}\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * State of the observer. If it is disabled events will not be fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Enables the observer. This method is called when the observer is registered to the\n\t * {@link module:engine/view/view~View} and after {@link module:engine/view/view~View#render rendering}\n\t * (all observers are {@link #disable disabled} before rendering).\n\t *\n\t * A typical use case for disabling observers is that mutation observers need to be disabled for the rendering.\n\t * However, a child class may not need to be disabled, so it can implement an empty method.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#disable\n\t */\n\tenable() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Disables the observer. This method is called before\n\t * {@link module:engine/view/view~View#render rendering} to prevent firing events during rendering.\n\t *\n\t * @see module:engine/view/observer/observer~Observer#enable\n\t */\n\tdisable() {\n\t\tthis.isEnabled = false;\n\t}\n\n\t/**\n\t * Disables and destroys the observer, among others removes event listeners created by the observer.\n\t */\n\tdestroy() {\n\t\tthis.disable();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Starts observing the given root element.\n\t *\n\t * @method #observe\n\t * @param {HTMLElement} domElement\n\t * @param {String} name The name of the root element.\n\t */\n}\n\nmix( Observer, DomEmitterMixin );\n","/** Used to stand-in for `undefined` hash values. */\nvar HASH_UNDEFINED = '__lodash_hash_undefined__';\n\n/**\n * Adds `value` to the array cache.\n *\n * @private\n * @name add\n * @memberOf SetCache\n * @alias push\n * @param {*} value The value to cache.\n * @returns {Object} Returns the cache instance.\n */\nfunction setCacheAdd(value) {\n  this.__data__.set(value, HASH_UNDEFINED);\n  return this;\n}\n\nexport default setCacheAdd;\n","/**\n * Checks if `value` is in the array cache.\n *\n * @private\n * @name has\n * @memberOf SetCache\n * @param {*} value The value to search for.\n * @returns {number} Returns `true` if `value` is found, else `false`.\n */\nfunction setCacheHas(value) {\n  return this.__data__.has(value);\n}\n\nexport default setCacheHas;\n","import MapCache from './_MapCache';\nimport setCacheAdd from './_setCacheAdd';\nimport setCacheHas from './_setCacheHas';\n\n/**\n *\n * Creates an array cache object to store unique values.\n *\n * @private\n * @constructor\n * @param {Array} [values] The values to cache.\n */\nfunction SetCache(values) {\n  var index = -1,\n      length = values ? values.length : 0;\n\n  this.__data__ = new MapCache;\n  while (++index < length) {\n    this.add(values[index]);\n  }\n}\n\n// Add methods to `SetCache`.\nSetCache.prototype.add = SetCache.prototype.push = setCacheAdd;\nSetCache.prototype.has = setCacheHas;\n\nexport default SetCache;\n","/**\n * A specialized version of `_.some` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {boolean} Returns `true` if any element passes the predicate check,\n *  else `false`.\n */\nfunction arraySome(array, predicate) {\n  var index = -1,\n      length = array.length;\n\n  while (++index < length) {\n    if (predicate(array[index], index, array)) {\n      return true;\n    }\n  }\n  return false;\n}\n\nexport default arraySome;\n","import SetCache from './_SetCache';\nimport arraySome from './_arraySome';\n\n/** Used to compose bitmasks for comparison styles. */\nvar UNORDERED_COMPARE_FLAG = 1,\n    PARTIAL_COMPARE_FLAG = 2;\n\n/**\n * A specialized version of `baseIsEqualDeep` for arrays with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Array} array The array to compare.\n * @param {Array} other The other array to compare.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Function} customizer The function to customize comparisons.\n * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual`\n *  for more details.\n * @param {Object} stack Tracks traversed `array` and `other` objects.\n * @returns {boolean} Returns `true` if the arrays are equivalent, else `false`.\n */\nfunction equalArrays(array, other, equalFunc, customizer, bitmask, stack) {\n  var isPartial = bitmask & PARTIAL_COMPARE_FLAG,\n      arrLength = array.length,\n      othLength = other.length;\n\n  if (arrLength != othLength && !(isPartial && othLength > arrLength)) {\n    return false;\n  }\n  // Assume cyclic values are equal.\n  var stacked = stack.get(array);\n  if (stacked) {\n    return stacked == other;\n  }\n  var index = -1,\n      result = true,\n      seen = (bitmask & UNORDERED_COMPARE_FLAG) ? new SetCache : undefined;\n\n  stack.set(array, other);\n\n  // Ignore non-index properties.\n  while (++index < arrLength) {\n    var arrValue = array[index],\n        othValue = other[index];\n\n    if (customizer) {\n      var compared = isPartial\n        ? customizer(othValue, arrValue, index, other, array, stack)\n        : customizer(arrValue, othValue, index, array, other, stack);\n    }\n    if (compared !== undefined) {\n      if (compared) {\n        continue;\n      }\n      result = false;\n      break;\n    }\n    // Recursively compare arrays (susceptible to call stack limits).\n    if (seen) {\n      if (!arraySome(other, function(othValue, othIndex) {\n            if (!seen.has(othIndex) &&\n                (arrValue === othValue || equalFunc(arrValue, othValue, customizer, bitmask, stack))) {\n              return seen.add(othIndex);\n            }\n          })) {\n        result = false;\n        break;\n      }\n    } else if (!(\n          arrValue === othValue ||\n            equalFunc(arrValue, othValue, customizer, bitmask, stack)\n        )) {\n      result = false;\n      break;\n    }\n  }\n  stack['delete'](array);\n  return result;\n}\n\nexport default equalArrays;\n","import Symbol from './_Symbol';\nimport Uint8Array from './_Uint8Array';\nimport equalArrays from './_equalArrays';\nimport mapToArray from './_mapToArray';\nimport setToArray from './_setToArray';\n\n/** Used to compose bitmasks for comparison styles. */\nvar UNORDERED_COMPARE_FLAG = 1,\n    PARTIAL_COMPARE_FLAG = 2;\n\n/** `Object#toString` result references. */\nvar boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    symbolTag = '[object Symbol]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]';\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolValueOf = symbolProto ? symbolProto.valueOf : undefined;\n\n/**\n * A specialized version of `baseIsEqualDeep` for comparing objects of\n * the same `toStringTag`.\n *\n * **Note:** This function only supports comparing values with tags of\n * `Boolean`, `Date`, `Error`, `Number`, `RegExp`, or `String`.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {string} tag The `toStringTag` of the objects to compare.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Function} customizer The function to customize comparisons.\n * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual`\n *  for more details.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalByTag(object, other, tag, equalFunc, customizer, bitmask, stack) {\n  switch (tag) {\n    case dataViewTag:\n      if ((object.byteLength != other.byteLength) ||\n          (object.byteOffset != other.byteOffset)) {\n        return false;\n      }\n      object = object.buffer;\n      other = other.buffer;\n\n    case arrayBufferTag:\n      if ((object.byteLength != other.byteLength) ||\n          !equalFunc(new Uint8Array(object), new Uint8Array(other))) {\n        return false;\n      }\n      return true;\n\n    case boolTag:\n    case dateTag:\n      // Coerce dates and booleans to numbers, dates to milliseconds and\n      // booleans to `1` or `0` treating invalid dates coerced to `NaN` as\n      // not equal.\n      return +object == +other;\n\n    case errorTag:\n      return object.name == other.name && object.message == other.message;\n\n    case numberTag:\n      // Treat `NaN` vs. `NaN` as equal.\n      return (object != +object) ? other != +other : object == +other;\n\n    case regexpTag:\n    case stringTag:\n      // Coerce regexes to strings and treat strings, primitives and objects,\n      // as equal. See http://www.ecma-international.org/ecma-262/6.0/#sec-regexp.prototype.tostring\n      // for more details.\n      return object == (other + '');\n\n    case mapTag:\n      var convert = mapToArray;\n\n    case setTag:\n      var isPartial = bitmask & PARTIAL_COMPARE_FLAG;\n      convert || (convert = setToArray);\n\n      if (object.size != other.size && !isPartial) {\n        return false;\n      }\n      // Assume cyclic values are equal.\n      var stacked = stack.get(object);\n      if (stacked) {\n        return stacked == other;\n      }\n      bitmask |= UNORDERED_COMPARE_FLAG;\n      stack.set(object, other);\n\n      // Recursively compare objects (susceptible to call stack limits).\n      return equalArrays(convert(object), convert(other), equalFunc, customizer, bitmask, stack);\n\n    case symbolTag:\n      if (symbolValueOf) {\n        return symbolValueOf.call(object) == symbolValueOf.call(other);\n      }\n  }\n  return false;\n}\n\nexport default equalByTag;\n","import baseHas from './_baseHas';\nimport keys from './keys';\n\n/** Used to compose bitmasks for comparison styles. */\nvar PARTIAL_COMPARE_FLAG = 2;\n\n/**\n * A specialized version of `baseIsEqualDeep` for objects with support for\n * partial deep comparisons.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Function} customizer The function to customize comparisons.\n * @param {number} bitmask The bitmask of comparison flags. See `baseIsEqual`\n *  for more details.\n * @param {Object} stack Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction equalObjects(object, other, equalFunc, customizer, bitmask, stack) {\n  var isPartial = bitmask & PARTIAL_COMPARE_FLAG,\n      objProps = keys(object),\n      objLength = objProps.length,\n      othProps = keys(other),\n      othLength = othProps.length;\n\n  if (objLength != othLength && !isPartial) {\n    return false;\n  }\n  var index = objLength;\n  while (index--) {\n    var key = objProps[index];\n    if (!(isPartial ? key in other : baseHas(other, key))) {\n      return false;\n    }\n  }\n  // Assume cyclic values are equal.\n  var stacked = stack.get(object);\n  if (stacked) {\n    return stacked == other;\n  }\n  var result = true;\n  stack.set(object, other);\n\n  var skipCtor = isPartial;\n  while (++index < objLength) {\n    key = objProps[index];\n    var objValue = object[key],\n        othValue = other[key];\n\n    if (customizer) {\n      var compared = isPartial\n        ? customizer(othValue, objValue, key, other, object, stack)\n        : customizer(objValue, othValue, key, object, other, stack);\n    }\n    // Recursively compare objects (susceptible to call stack limits).\n    if (!(compared === undefined\n          ? (objValue === othValue || equalFunc(objValue, othValue, customizer, bitmask, stack))\n          : compared\n        )) {\n      result = false;\n      break;\n    }\n    skipCtor || (skipCtor = key == 'constructor');\n  }\n  if (result && !skipCtor) {\n    var objCtor = object.constructor,\n        othCtor = other.constructor;\n\n    // Non `Object` object instances with different constructors are not equal.\n    if (objCtor != othCtor &&\n        ('constructor' in object && 'constructor' in other) &&\n        !(typeof objCtor == 'function' && objCtor instanceof objCtor &&\n          typeof othCtor == 'function' && othCtor instanceof othCtor)) {\n      result = false;\n    }\n  }\n  stack['delete'](object);\n  return result;\n}\n\nexport default equalObjects;\n","import isLength from './isLength';\nimport isObjectLike from './isObjectLike';\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    boolTag = '[object Boolean]',\n    dateTag = '[object Date]',\n    errorTag = '[object Error]',\n    funcTag = '[object Function]',\n    mapTag = '[object Map]',\n    numberTag = '[object Number]',\n    objectTag = '[object Object]',\n    regexpTag = '[object RegExp]',\n    setTag = '[object Set]',\n    stringTag = '[object String]',\n    weakMapTag = '[object WeakMap]';\n\nvar arrayBufferTag = '[object ArrayBuffer]',\n    dataViewTag = '[object DataView]',\n    float32Tag = '[object Float32Array]',\n    float64Tag = '[object Float64Array]',\n    int8Tag = '[object Int8Array]',\n    int16Tag = '[object Int16Array]',\n    int32Tag = '[object Int32Array]',\n    uint8Tag = '[object Uint8Array]',\n    uint8ClampedTag = '[object Uint8ClampedArray]',\n    uint16Tag = '[object Uint16Array]',\n    uint32Tag = '[object Uint32Array]';\n\n/** Used to identify `toStringTag` values of typed arrays. */\nvar typedArrayTags = {};\ntypedArrayTags[float32Tag] = typedArrayTags[float64Tag] =\ntypedArrayTags[int8Tag] = typedArrayTags[int16Tag] =\ntypedArrayTags[int32Tag] = typedArrayTags[uint8Tag] =\ntypedArrayTags[uint8ClampedTag] = typedArrayTags[uint16Tag] =\ntypedArrayTags[uint32Tag] = true;\ntypedArrayTags[argsTag] = typedArrayTags[arrayTag] =\ntypedArrayTags[arrayBufferTag] = typedArrayTags[boolTag] =\ntypedArrayTags[dataViewTag] = typedArrayTags[dateTag] =\ntypedArrayTags[errorTag] = typedArrayTags[funcTag] =\ntypedArrayTags[mapTag] = typedArrayTags[numberTag] =\ntypedArrayTags[objectTag] = typedArrayTags[regexpTag] =\ntypedArrayTags[setTag] = typedArrayTags[stringTag] =\ntypedArrayTags[weakMapTag] = false;\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/**\n * Used to resolve the\n * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)\n * of values.\n */\nvar objectToString = objectProto.toString;\n\n/**\n * Checks if `value` is classified as a typed array.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Lang\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is correctly classified,\n *  else `false`.\n * @example\n *\n * _.isTypedArray(new Uint8Array);\n * // => true\n *\n * _.isTypedArray([]);\n * // => false\n */\nfunction isTypedArray(value) {\n  return isObjectLike(value) &&\n    isLength(value.length) && !!typedArrayTags[objectToString.call(value)];\n}\n\nexport default isTypedArray;\n","import Stack from './_Stack';\nimport equalArrays from './_equalArrays';\nimport equalByTag from './_equalByTag';\nimport equalObjects from './_equalObjects';\nimport getTag from './_getTag';\nimport isArray from './isArray';\nimport isHostObject from './_isHostObject';\nimport isTypedArray from './isTypedArray';\n\n/** Used to compose bitmasks for comparison styles. */\nvar PARTIAL_COMPARE_FLAG = 2;\n\n/** `Object#toString` result references. */\nvar argsTag = '[object Arguments]',\n    arrayTag = '[object Array]',\n    objectTag = '[object Object]';\n\n/** Used for built-in method references. */\nvar objectProto = Object.prototype;\n\n/** Used to check objects for own properties. */\nvar hasOwnProperty = objectProto.hasOwnProperty;\n\n/**\n * A specialized version of `baseIsEqual` for arrays and objects which performs\n * deep comparisons and tracks traversed objects enabling objects with circular\n * references to be compared.\n *\n * @private\n * @param {Object} object The object to compare.\n * @param {Object} other The other object to compare.\n * @param {Function} equalFunc The function to determine equivalents of values.\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {number} [bitmask] The bitmask of comparison flags. See `baseIsEqual`\n *  for more details.\n * @param {Object} [stack] Tracks traversed `object` and `other` objects.\n * @returns {boolean} Returns `true` if the objects are equivalent, else `false`.\n */\nfunction baseIsEqualDeep(object, other, equalFunc, customizer, bitmask, stack) {\n  var objIsArr = isArray(object),\n      othIsArr = isArray(other),\n      objTag = arrayTag,\n      othTag = arrayTag;\n\n  if (!objIsArr) {\n    objTag = getTag(object);\n    objTag = objTag == argsTag ? objectTag : objTag;\n  }\n  if (!othIsArr) {\n    othTag = getTag(other);\n    othTag = othTag == argsTag ? objectTag : othTag;\n  }\n  var objIsObj = objTag == objectTag && !isHostObject(object),\n      othIsObj = othTag == objectTag && !isHostObject(other),\n      isSameTag = objTag == othTag;\n\n  if (isSameTag && !objIsObj) {\n    stack || (stack = new Stack);\n    return (objIsArr || isTypedArray(object))\n      ? equalArrays(object, other, equalFunc, customizer, bitmask, stack)\n      : equalByTag(object, other, objTag, equalFunc, customizer, bitmask, stack);\n  }\n  if (!(bitmask & PARTIAL_COMPARE_FLAG)) {\n    var objIsWrapped = objIsObj && hasOwnProperty.call(object, '__wrapped__'),\n        othIsWrapped = othIsObj && hasOwnProperty.call(other, '__wrapped__');\n\n    if (objIsWrapped || othIsWrapped) {\n      var objUnwrapped = objIsWrapped ? object.value() : object,\n          othUnwrapped = othIsWrapped ? other.value() : other;\n\n      stack || (stack = new Stack);\n      return equalFunc(objUnwrapped, othUnwrapped, customizer, bitmask, stack);\n    }\n  }\n  if (!isSameTag) {\n    return false;\n  }\n  stack || (stack = new Stack);\n  return equalObjects(object, other, equalFunc, customizer, bitmask, stack);\n}\n\nexport default baseIsEqualDeep;\n","import baseIsEqualDeep from './_baseIsEqualDeep';\nimport isObject from './isObject';\nimport isObjectLike from './isObjectLike';\n\n/**\n * The base implementation of `_.isEqual` which supports partial comparisons\n * and tracks traversed objects.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @param {boolean} [bitmask] The bitmask of comparison flags.\n *  The bitmask may be composed of the following flags:\n *     1 - Unordered comparison\n *     2 - Partial comparison\n * @param {Object} [stack] Tracks traversed `value` and `other` objects.\n * @returns {boolean} Returns `true` if the values are equivalent, else `false`.\n */\nfunction baseIsEqual(value, other, customizer, bitmask, stack) {\n  if (value === other) {\n    return true;\n  }\n  if (value == null || other == null || (!isObject(value) && !isObjectLike(other))) {\n    return value !== value && other !== other;\n  }\n  return baseIsEqualDeep(value, other, baseIsEqual, customizer, bitmask, stack);\n}\n\nexport default baseIsEqual;\n","import baseIsEqual from './_baseIsEqual';\n\n/**\n * This method is like `_.isEqual` except that it accepts `customizer` which\n * is invoked to compare values. If `customizer` returns `undefined`, comparisons\n * are handled by the method instead. The `customizer` is invoked with up to\n * six arguments: (objValue, othValue [, index|key, object, other, stack]).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if the values are equivalent,\n *  else `false`.\n * @example\n *\n * function isGreeting(value) {\n *   return /^h(?:i|ello)$/.test(value);\n * }\n *\n * function customizer(objValue, othValue) {\n *   if (isGreeting(objValue) && isGreeting(othValue)) {\n *     return true;\n *   }\n * }\n *\n * var array = ['hello', 'goodbye'];\n * var other = ['hi', 'goodbye'];\n *\n * _.isEqualWith(array, other, customizer);\n * // => true\n */\nfunction isEqualWith(value, other, customizer) {\n  customizer = typeof customizer == 'function' ? customizer : undefined;\n  var result = customizer ? customizer(value, other) : undefined;\n  return result === undefined ? baseIsEqual(value, other, customizer) : !!result;\n}\n\nexport default isEqualWith;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/mutationobserver\n */\n\n/* globals window */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { startsWithFiller, getDataWithoutFiller } from '../filler';\nimport isEqualWith from '@ckeditor/ckeditor5-utils/src/lib/lodash/isEqualWith';\n\n/**\n * Mutation observer class observes changes in the DOM, fires {@link module:engine/view/document~Document#event:mutations} event, mark view\n * elements as changed and call {@link module:engine/view/renderer~Renderer#render}.\n * Because all mutated nodes are marked as \"to be rendered\" and the\n * {@link module:engine/view/renderer~Renderer#render} is called, all changes will be reverted, unless the mutation will be handled by the\n * {@link module:engine/view/document~Document#event:mutations} event listener. It means user will see only handled changes, and the editor\n * will block all changes which are not handled.\n *\n * Mutation Observer also take care of reducing number of mutations which are fired. It removes duplicates and\n * mutations on elements which do not have corresponding view elements. Also\n * {@link module:engine/view/observer/mutationobserver~MutatedText text mutation} is fired only if parent element do not change child list.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class MutationObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Native mutation observer config.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._config = {\n\t\t\tchildList: true,\n\t\t\tcharacterData: true,\n\t\t\tcharacterDataOldValue: true,\n\t\t\tsubtree: true\n\t\t};\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#renderer}.\n\t\t *\n\t\t * @member {module:engine/view/renderer~Renderer}\n\t\t */\n\t\tthis.renderer = view._renderer;\n\n\t\t/**\n\t\t * Observed DOM elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<HTMLElement>}\n\t\t */\n\t\tthis._domElements = [];\n\n\t\t/**\n\t\t * Native mutation observer.\n\t\t *\n\t\t * @private\n\t\t * @member {MutationObserver}\n\t\t */\n\t\tthis._mutationObserver = new window.MutationObserver( this._onMutations.bind( this ) );\n\t}\n\n\t/**\n\t * Synchronously fires {@link module:engine/view/document~Document#event:mutations} event with all mutations in record queue.\n\t * At the same time empties the queue so mutations will not be fired twice.\n\t */\n\tflush() {\n\t\tthis._onMutations( this._mutationObserver.takeRecords() );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tthis._domElements.push( domElement );\n\n\t\tif ( this.isEnabled ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tenable() {\n\t\tsuper.enable();\n\n\t\tfor ( const domElement of this._domElements ) {\n\t\t\tthis._mutationObserver.observe( domElement, this._config );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdisable() {\n\t\tsuper.disable();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._mutationObserver.disconnect();\n\t}\n\n\t/**\n\t * Handles mutations. Deduplicates, mark view elements to sync, fire event and call render.\n\t *\n\t * @private\n\t * @param {Array.<Object>} domMutations Array of native mutations.\n\t */\n\t_onMutations( domMutations ) {\n\t\t// As a result of this.flush() we can have an empty collection.\n\t\tif ( domMutations.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.domConverter;\n\n\t\t// Use map and set for deduplication.\n\t\tconst mutatedTexts = new Map();\n\t\tconst mutatedElements = new Set();\n\n\t\t// Handle `childList` mutations first, so we will be able to check if the `characterData` mutation is in the\n\t\t// element with changed structure anyway.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tif ( mutation.type === 'childList' ) {\n\t\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t\t// Do not collect mutations from UIElements.\n\t\t\t\tif ( element && element.is( 'uiElement' ) ) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tif ( element && !this._isBogusBrMutation( mutation ) ) {\n\t\t\t\t\tmutatedElements.add( element );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Handle `characterData` mutations later, when we have the full list of nodes which changed structure.\n\t\tfor ( const mutation of domMutations ) {\n\t\t\tconst element = domConverter.mapDomToView( mutation.target );\n\n\t\t\t// Do not collect mutations from UIElements.\n\t\t\tif ( element && element.is( 'uiElement' ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( mutation.type === 'characterData' ) {\n\t\t\t\tconst text = domConverter.findCorrespondingViewText( mutation.target );\n\n\t\t\t\tif ( text && !mutatedElements.has( text.parent ) ) {\n\t\t\t\t\t// Use text as a key, for deduplication. If there will be another mutation on the same text element\n\t\t\t\t\t// we will have only one in the map.\n\t\t\t\t\tmutatedTexts.set( text, {\n\t\t\t\t\t\ttype: 'text',\n\t\t\t\t\t\toldText: text.data,\n\t\t\t\t\t\tnewText: getDataWithoutFiller( mutation.target ),\n\t\t\t\t\t\tnode: text\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t\t// When we added first letter to the text node which had only inline filler, for the DOM it is mutation\n\t\t\t\t// on text, but for the view, where filler text node did not existed, new text node was created, so we\n\t\t\t\t// need to fire 'children' mutation instead of 'text'.\n\t\t\t\telse if ( !text && startsWithFiller( mutation.target ) ) {\n\t\t\t\t\tmutatedElements.add( domConverter.mapDomToView( mutation.target.parentNode ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Now we build the list of mutations to fire and mark elements. We did not do it earlier to avoid marking the\n\t\t// same node multiple times in case of duplication.\n\n\t\t// List of mutations we will fire.\n\t\tconst viewMutations = [];\n\n\t\tfor ( const mutatedText of mutatedTexts.values() ) {\n\t\t\tthis.renderer.markToSync( 'text', mutatedText.node );\n\t\t\tviewMutations.push( mutatedText );\n\t\t}\n\n\t\tfor ( const viewElement of mutatedElements ) {\n\t\t\tconst domElement = domConverter.mapViewToDom( viewElement );\n\t\t\tconst viewChildren = Array.from( viewElement.getChildren() );\n\t\t\tconst newViewChildren = Array.from( domConverter.domChildrenToView( domElement, { withChildren: false } ) );\n\n\t\t\t// It may happen that as a result of many changes (sth was inserted and then removed),\n\t\t\t// both elements haven't really changed. #1031\n\t\t\tif ( !isEqualWith( viewChildren, newViewChildren, sameNodes ) ) {\n\t\t\t\tthis.renderer.markToSync( 'children', viewElement );\n\n\t\t\t\tviewMutations.push( {\n\t\t\t\t\ttype: 'children',\n\t\t\t\t\toldChildren: viewChildren,\n\t\t\t\t\tnewChildren: newViewChildren,\n\t\t\t\t\tnode: viewElement\n\t\t\t\t} );\n\t\t\t}\n\t\t}\n\n\t\t// Retrieve `domSelection` using `ownerDocument` of one of mutated nodes.\n\t\t// There should not be simultaneous mutation in multiple documents, so it's fine.\n\t\tconst domSelection = domMutations[ 0 ].target.ownerDocument.getSelection();\n\n\t\tlet viewSelection = null;\n\n\t\tif ( domSelection && domSelection.anchorNode ) {\n\t\t\t// If `domSelection` is inside a dom node that is already bound to a view node from view tree, get\n\t\t\t// corresponding selection in the view and pass it together with `viewMutations`. The `viewSelection` may\n\t\t\t// be used by features handling mutations.\n\t\t\t// Only one range is supported.\n\n\t\t\tconst viewSelectionAnchor = domConverter.domPositionToView( domSelection.anchorNode, domSelection.anchorOffset );\n\t\t\tconst viewSelectionFocus = domConverter.domPositionToView( domSelection.focusNode, domSelection.focusOffset );\n\n\t\t\t// Anchor and focus has to be properly mapped to view.\n\t\t\tif ( viewSelectionAnchor && viewSelectionFocus ) {\n\t\t\t\tviewSelection = new ViewSelection( viewSelectionAnchor );\n\t\t\t\tviewSelection.setFocus( viewSelectionFocus );\n\t\t\t}\n\t\t}\n\n\t\tthis.document.fire( 'mutations', viewMutations, viewSelection );\n\n\t\t// If nothing changes on `mutations` event, at this point we have \"dirty DOM\" (changed) and de-synched\n\t\t// view (which has not been changed). In order to \"reset DOM\" we render the view again.\n\t\tthis.view.render();\n\n\t\tfunction sameNodes( child1, child2 ) {\n\t\t\t// First level of comparison (array of children vs array of children) – use the Lodash's default behavior.\n\t\t\tif ( Array.isArray( child1 ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Elements.\n\t\t\tif ( child1 === child2 ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t\t// Texts.\n\t\t\telse if ( child1.is( 'text' ) && child2.is( 'text' ) ) {\n\t\t\t\treturn child1.data === child2.data;\n\t\t\t}\n\n\t\t\t// Not matching types.\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Checks if mutation was generated by the browser inserting bogus br on the end of the block element.\n\t * Such mutations are generated while pressing space or performing native spellchecker correction\n\t * on the end of the block element in Firefox browser.\n\t *\n\t * @private\n\t * @param {Object} mutation Native mutation object.\n\t * @returns {Boolean}\n\t */\n\t_isBogusBrMutation( mutation ) {\n\t\tlet addedNode = null;\n\n\t\t// Check if mutation added only one node on the end of its parent.\n\t\tif ( mutation.nextSibling === null && mutation.removedNodes.length === 0 && mutation.addedNodes.length == 1 ) {\n\t\t\taddedNode = this.domConverter.domToView( mutation.addedNodes[ 0 ], {\n\t\t\t\twithChildren: false\n\t\t\t} );\n\t\t}\n\n\t\treturn addedNode && addedNode.is( 'element', 'br' );\n\t}\n}\n\n/**\n * Fired when mutation occurred. If tree view is not changed on this event, DOM will be reverted to the state before\n * mutation, so all changes which should be applied, should be handled on this event.\n *\n * Introduced by {@link module:engine/view/observer/mutationobserver~MutationObserver}.\n *\n * Note that because {@link module:engine/view/observer/mutationobserver~MutationObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @event module:engine/view/document~Document#event:mutations\n * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|module:engine/view/observer/mutationobserver~MutatedChildren>}\n * viewMutations Array of mutations.\n * For mutated texts it will be {@link module:engine/view/observer/mutationobserver~MutatedText} and for mutated elements it will be\n * {@link module:engine/view/observer/mutationobserver~MutatedChildren}. You can recognize the type based on the `type` property.\n * @param {module:engine/view/selection~Selection|null} viewSelection View selection that is a result of converting DOM selection to view.\n * Keep in\n * mind that the DOM selection is already \"updated\", meaning that it already acknowledges changes done in mutation.\n */\n\n/**\n * Mutation item for text.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedText\n *\n * @property {String} type For text mutations it is always 'text'.\n * @property {module:engine/view/text~Text} node Mutated text node.\n * @property {String} oldText Old text.\n * @property {String} newText New text.\n */\n\n/**\n * Mutation item for child nodes.\n *\n * @see module:engine/view/document~Document#event:mutations\n * @see module:engine/view/observer/mutationobserver~MutatedText\n *\n * @typedef {Object} module:engine/view/observer/mutationobserver~MutatedChildren\n *\n * @property {String} type For child nodes mutations it is always 'children'.\n * @property {module:engine/view/element~Element} node Parent of the mutated children.\n * @property {Array.<module:engine/view/node~Node>} oldChildren Old child nodes.\n * @property {Array.<module:engine/view/node~Node>} newChildren New child nodes.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/domeventdata\n */\n\nimport extend from '@ckeditor/ckeditor5-utils/src/lib/lodash/extend';\n\n/**\n * Information about a DOM event in context of the {@link module:engine/view/document~Document}.\n * It wraps the native event, which usually should not be used as the wrapper contains\n * additional data (like key code for keyboard events).\n */\nexport default class DomEventData {\n\t/**\n\t * @param {module:engine/view/view~View} view The instance of the view controller.\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] Additional properties that the instance should contain.\n\t */\n\tconstructor( view, domEvent, additionalData ) {\n\t\t/**\n\t\t * Instance of the view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View} module:engine/view/observer/observer~Observer.DomEvent#view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * The instance of the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document} module:engine/view/observer/observer~Observer.DomEvent#document\n\t\t */\n\t\tthis.document = view.document;\n\n\t\t/**\n\t\t * The DOM event.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Event} module:engine/view/observer/observer~Observer.DomEvent#domEvent\n\t\t */\n\t\tthis.domEvent = domEvent;\n\n\t\t/**\n\t\t * The DOM target.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} module:engine/view/observer/observer~Observer.DomEvent#target\n\t\t */\n\t\tthis.domTarget = domEvent.target;\n\n\t\textend( this, additionalData );\n\t}\n\n\t/**\n\t * The tree view element representing the target.\n\t *\n\t * @readonly\n\t * @type module:engine/view/element~Element\n\t */\n\tget target() {\n\t\treturn this.view.domConverter.mapDomToView( this.domTarget );\n\t}\n\n\t/**\n\t * Prevents the native's event default action.\n\t */\n\tpreventDefault() {\n\t\tthis.domEvent.preventDefault();\n\t}\n\n\t/**\n\t * Stops native event propagation.\n\t */\n\tstopPropagation() {\n\t\tthis.domEvent.stopPropagation();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/domeventobserver\n */\n\nimport Observer from './observer';\nimport DomEventData from './domeventdata';\n\n/**\n * Base class for DOM event observers. This class handles\n * {@link module:engine/view/observer/observer~Observer#observe adding} listeners to DOM elements,\n * {@link module:engine/view/observer/observer~Observer#disable disabling} and\n * {@link module:engine/view/observer/observer~Observer#enable re-enabling} events.\n * Child class needs to define\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#domEventType DOM event type} and\n * {@link module:engine/view/observer/domeventobserver~DomEventObserver#onDomEvent callback}.\n *\n * For instance:\n *\n *\t\tclass ClickObserver extends DomEventObserver {\n *\t\t\t// It can also be defined as a normal property in the constructor.\n *\t\t\tget domEventType() {\n *\t\t\t\treturn 'click';\n *\t\t\t}\n *\n *\t\t\tonDomEvent( domEvent ) {\n *\t\t\t\tthis.fire( 'click', domEvent );\n *\t\t\t}\n *\t\t}\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DomEventObserver extends Observer {\n\t/**\n\t * Type of the DOM event the observer should listen on. Array of types can be defined\n\t * if the obsever should listen to multiple DOM events.\n\t *\n\t * @readonly\n\t * @member {String|Array.<String>} #domEventType\n\t */\n\n\t/**\n\t * Callback which should be called when the DOM event occurred. Note that the callback will not be called if\n\t * observer {@link #isEnabled is not enabled}.\n\t *\n\t * @see #domEventType\n\t * @abstract\n\t * @method #onDomEvent\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * If set to `true` DOM events will be listened on the capturing phase.\n\t\t * Default value is `false`.\n\t\t *\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.useCapture = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst types = typeof this.domEventType == 'string' ? [ this.domEventType ] : this.domEventType;\n\n\t\ttypes.forEach( type => {\n\t\t\tthis.listenTo( domElement, type, ( eventInfo, domEvent ) => {\n\t\t\t\tif ( this.isEnabled ) {\n\t\t\t\t\tthis.onDomEvent( domEvent );\n\t\t\t\t}\n\t\t\t}, { useCapture: this.useCapture } );\n\t\t} );\n\t}\n\n\t/**\n\t * Calls `Document#fire()` if observer {@link #isEnabled is enabled}.\n\t *\n\t * @see module:utils/emittermixin~EmitterMixin#fire\n\t * @param {String} eventType The event type (name).\n\t * @param {Event} domEvent The DOM event.\n\t * @param {Object} [additionalData] The additional data which should extend the\n\t * {@link module:engine/view/observer/domeventdata~DomEventData event data} object.\n\t */\n\tfire( eventType, domEvent, additionalData ) {\n\t\tif ( this.isEnabled ) {\n\t\t\tthis.document.fire( eventType, new DomEventData( this.view, domEvent, additionalData ) );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/keyobserver\n */\n\nimport DomEventObserver from './domeventobserver';\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * {@link module:engine/view/document~Document#event:keydown Key down} event observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class KeyObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'keydown', 'keyup' ];\n\t}\n\n\tonDomEvent( domEvt ) {\n\t\tthis.fire( domEvt.type, domEvt, {\n\t\t\tkeyCode: domEvt.keyCode,\n\n\t\t\taltKey: domEvt.altKey,\n\t\t\tctrlKey: domEvt.ctrlKey || domEvt.metaKey,\n\t\t\tshiftKey: domEvt.shiftKey,\n\n\t\t\tget keystroke() {\n\t\t\t\treturn getCode( this );\n\t\t\t}\n\t\t} );\n\t}\n}\n\n/**\n * Fired when a key has been pressed.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keydown\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * Fired when a key has been released.\n *\n * Introduced by {@link module:engine/view/observer/keyobserver~KeyObserver}.\n *\n * Note that because {@link module:engine/view/observer/keyobserver~KeyObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/keyobserver~KeyObserver\n * @event module:engine/view/document~Document#event:keyup\n * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEventData\n */\n\n/**\n * The value of both events - {@link module:engine/view/document~Document#event:keydown} and\n * {@link module:engine/view/document~Document#event:keyup}.\n *\n * @class module:engine/view/observer/keyobserver~KeyEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n * @implements module:utils/keyboard~KeystrokeInfo\n */\n\n/**\n * Code of the whole keystroke. See {@link module:utils/keyboard~getCode}.\n *\n * @readonly\n * @member {Number} module:engine/view/observer/keyobserver~KeyEventData#keystroke\n */\n","/**\n * Gets the timestamp of the number of milliseconds that have elapsed since\n * the Unix epoch (1 January 1970 00:00:00 UTC).\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @type {Function}\n * @category Date\n * @returns {number} Returns the timestamp.\n * @example\n *\n * _.defer(function(stamp) {\n *   console.log(_.now() - stamp);\n * }, _.now());\n * // => Logs the number of milliseconds it took for the deferred function to be invoked.\n */\nvar now = Date.now;\n\nexport default now;\n","import isObject from './isObject';\nimport now from './now';\nimport toNumber from './toNumber';\n\n/** Used as the `TypeError` message for \"Functions\" methods. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n    nativeMin = Math.min;\n\n/**\n * Creates a debounced function that delays invoking `func` until after `wait`\n * milliseconds have elapsed since the last time the debounced function was\n * invoked. The debounced function comes with a `cancel` method to cancel\n * delayed `func` invocations and a `flush` method to immediately invoke them.\n * Provide an options object to indicate whether `func` should be invoked on\n * the leading and/or trailing edge of the `wait` timeout. The `func` is invoked\n * with the last arguments provided to the debounced function. Subsequent calls\n * to the debounced function return the result of the last `func` invocation.\n *\n * **Note:** If `leading` and `trailing` options are `true`, `func` is invoked\n * on the trailing edge of the timeout only if the debounced function is\n * invoked more than once during the `wait` timeout.\n *\n * See [David Corbacho's article](https://css-tricks.com/debouncing-throttling-explained-examples/)\n * for details over the differences between `_.debounce` and `_.throttle`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to debounce.\n * @param {number} [wait=0] The number of milliseconds to delay.\n * @param {Object} [options={}] The options object.\n * @param {boolean} [options.leading=false]\n *  Specify invoking on the leading edge of the timeout.\n * @param {number} [options.maxWait]\n *  The maximum time `func` is allowed to be delayed before it's invoked.\n * @param {boolean} [options.trailing=true]\n *  Specify invoking on the trailing edge of the timeout.\n * @returns {Function} Returns the new debounced function.\n * @example\n *\n * // Avoid costly calculations while the window size is in flux.\n * jQuery(window).on('resize', _.debounce(calculateLayout, 150));\n *\n * // Invoke `sendMail` when clicked, debouncing subsequent calls.\n * jQuery(element).on('click', _.debounce(sendMail, 300, {\n *   'leading': true,\n *   'trailing': false\n * }));\n *\n * // Ensure `batchLog` is invoked once after 1 second of debounced calls.\n * var debounced = _.debounce(batchLog, 250, { 'maxWait': 1000 });\n * var source = new EventSource('/stream');\n * jQuery(source).on('message', debounced);\n *\n * // Cancel the trailing debounced invocation.\n * jQuery(window).on('popstate', debounced.cancel);\n */\nfunction debounce(func, wait, options) {\n  var lastArgs,\n      lastThis,\n      maxWait,\n      result,\n      timerId,\n      lastCallTime = 0,\n      lastInvokeTime = 0,\n      leading = false,\n      maxing = false,\n      trailing = true;\n\n  if (typeof func != 'function') {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  wait = toNumber(wait) || 0;\n  if (isObject(options)) {\n    leading = !!options.leading;\n    maxing = 'maxWait' in options;\n    maxWait = maxing ? nativeMax(toNumber(options.maxWait) || 0, wait) : maxWait;\n    trailing = 'trailing' in options ? !!options.trailing : trailing;\n  }\n\n  function invokeFunc(time) {\n    var args = lastArgs,\n        thisArg = lastThis;\n\n    lastArgs = lastThis = undefined;\n    lastInvokeTime = time;\n    result = func.apply(thisArg, args);\n    return result;\n  }\n\n  function leadingEdge(time) {\n    // Reset any `maxWait` timer.\n    lastInvokeTime = time;\n    // Start the timer for the trailing edge.\n    timerId = setTimeout(timerExpired, wait);\n    // Invoke the leading edge.\n    return leading ? invokeFunc(time) : result;\n  }\n\n  function remainingWait(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime,\n        result = wait - timeSinceLastCall;\n\n    return maxing ? nativeMin(result, maxWait - timeSinceLastInvoke) : result;\n  }\n\n  function shouldInvoke(time) {\n    var timeSinceLastCall = time - lastCallTime,\n        timeSinceLastInvoke = time - lastInvokeTime;\n\n    // Either this is the first call, activity has stopped and we're at the\n    // trailing edge, the system time has gone backwards and we're treating\n    // it as the trailing edge, or we've hit the `maxWait` limit.\n    return (!lastCallTime || (timeSinceLastCall >= wait) ||\n      (timeSinceLastCall < 0) || (maxing && timeSinceLastInvoke >= maxWait));\n  }\n\n  function timerExpired() {\n    var time = now();\n    if (shouldInvoke(time)) {\n      return trailingEdge(time);\n    }\n    // Restart the timer.\n    timerId = setTimeout(timerExpired, remainingWait(time));\n  }\n\n  function trailingEdge(time) {\n    clearTimeout(timerId);\n    timerId = undefined;\n\n    // Only invoke if we have `lastArgs` which means `func` has been\n    // debounced at least once.\n    if (trailing && lastArgs) {\n      return invokeFunc(time);\n    }\n    lastArgs = lastThis = undefined;\n    return result;\n  }\n\n  function cancel() {\n    if (timerId !== undefined) {\n      clearTimeout(timerId);\n    }\n    lastCallTime = lastInvokeTime = 0;\n    lastArgs = lastThis = timerId = undefined;\n  }\n\n  function flush() {\n    return timerId === undefined ? result : trailingEdge(now());\n  }\n\n  function debounced() {\n    var time = now(),\n        isInvoking = shouldInvoke(time);\n\n    lastArgs = arguments;\n    lastThis = this;\n    lastCallTime = time;\n\n    if (isInvoking) {\n      if (timerId === undefined) {\n        return leadingEdge(lastCallTime);\n      }\n      if (maxing) {\n        // Handle invocations in a tight loop.\n        clearTimeout(timerId);\n        timerId = setTimeout(timerExpired, wait);\n        return invokeFunc(lastCallTime);\n      }\n    }\n    if (timerId === undefined) {\n      timerId = setTimeout(timerExpired, wait);\n    }\n    return result;\n  }\n  debounced.cancel = cancel;\n  debounced.flush = flush;\n  return debounced;\n}\n\nexport default debounce;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/fakeselectionobserver\n */\n\nimport Observer from './observer';\nimport ViewSelection from '../selection';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport debounce from '@ckeditor/ckeditor5-utils/src/lib/lodash/debounce';\n\n/**\n * Fake selection observer class. If view selection is fake it is placed in dummy DOM container. This observer listens\n * on {@link module:engine/view/document~Document#event:keydown keydown} events and handles moving fake view selection to the correct place\n * if arrow keys are pressed.\n * Fires {@link module:engine/view/document~Document#event:selectionChange selectionChange event} simulating natural behaviour of\n * {@link module:engine/view/observer/selectionobserver~SelectionObserver SelectionObserver}.\n *\n * @extends module:engine/view/observer/observer~Observer.Observer\n */\nexport default class FakeSelectionObserver extends Observer {\n\t/**\n\t * Creates new FakeSelectionObserver instance.\n\t *\n\t * @param {module:engine/view/view~View} view\n\t */\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'keydown', ( eventInfo, data ) => {\n\t\t\tconst selection = document.selection;\n\n\t\t\tif ( selection.isFake && _isArrowKeyCode( data.keyCode ) && this.isEnabled ) {\n\t\t\t\t// Prevents default key down handling - no selection change will occur.\n\t\t\t\tdata.preventDefault();\n\n\t\t\t\tthis._handleSelectionMove( data.keyCode );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Handles collapsing view selection according to given key code. If left or up key is provided - new selection will be\n\t * collapsed to left. If right or down key is pressed - new selection will be collapsed to right.\n\t *\n\t * This method fires {@link module:engine/view/document~Document#event:selectionChange} and\n\t * {@link module:engine/view/document~Document#event:selectionChangeDone} events imitating behaviour of\n\t * {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n\t *\n\t * @private\n\t * @param {Number} keyCode\n\t * @fires module:engine/view/document~Document#event:selectionChange\n\t * @fires module:engine/view/document~Document#event:selectionChangeDone\n\t */\n\t_handleSelectionMove( keyCode ) {\n\t\tconst selection = this.document.selection;\n\t\tconst newSelection = new ViewSelection( selection.getRanges(), { backward: selection.isBackward, fake: false } );\n\n\t\t// Left or up arrow pressed - move selection to start.\n\t\tif ( keyCode == keyCodes.arrowleft || keyCode == keyCodes.arrowup ) {\n\t\t\tnewSelection.setTo( newSelection.getFirstPosition() );\n\t\t}\n\n\t\t// Right or down arrow pressed - move selection to end.\n\t\tif ( keyCode == keyCodes.arrowright || keyCode == keyCodes.arrowdown ) {\n\t\t\tnewSelection.setTo( newSelection.getLastPosition() );\n\t\t}\n\n\t\tconst data = {\n\t\t\toldSelection: selection,\n\t\t\tnewSelection,\n\t\t\tdomSelection: null\n\t\t};\n\n\t\t// Fire dummy selection change event.\n\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t}\n}\n\n// Checks if one of the arrow keys is pressed.\n//\n// @private\n// @param {Number} keyCode\n// @returns {Boolean}\nfunction _isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/selectionobserver\n */\n\n/* global setInterval, clearInterval */\n\nimport Observer from './observer';\nimport MutationObserver from './mutationobserver';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport debounce from '@ckeditor/ckeditor5-utils/src/lib/lodash/debounce';\n\n/**\n * Selection observer class observes selection changes in the document. If selection changes on the document this\n * observer checks if there are any mutations and if DOM selection is different than the\n * {@link module:engine/view/document~Document#selection view selection}. Selection observer fires\n * {@link module:engine/view/document~Document#event:selectionChange} event only if selection change was the only change in the document\n * and DOM selection is different then the view selection.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @see module:engine/view/observer/mutationobserver~MutationObserver\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class SelectionObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * Instance of the mutation observer. Selection observer calls\n\t\t * {@link module:engine/view/observer/mutationobserver~MutationObserver#flush} to ensure that the mutations will be handled\n\t\t * before the {@link module:engine/view/document~Document#event:selectionChange} event is fired.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/observer/mutationobserver~MutationObserver}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#mutationObserver\n\t\t */\n\t\tthis.mutationObserver = view.getObserver( MutationObserver );\n\n\t\t/**\n\t\t * Reference to the view {@link module:engine/view/documentselection~DocumentSelection} object used to compare\n\t\t * new selection with it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/documentselection~DocumentSelection}\n\t\t * module:engine/view/observer/selectionobserver~SelectionObserver#selection\n\t\t */\n\t\tthis.selection = this.document.selection;\n\n\t\t/* eslint-disable max-len */\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/view~View#domConverter}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter} module:engine/view/observer/selectionobserver~SelectionObserver#domConverter\n\t\t */\n\t\t/* eslint-enable max-len */\n\t\tthis.domConverter = view.domConverter;\n\n\t\t/**\n\t\t * Set of documents which have added \"selectionchange\" listener to avoid adding listener twice to the same\n\t\t * document.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.<Document>} module:engine/view/observer/selectionobserver~SelectionObserver#_documents\n\t\t */\n\t\tthis._documents = new WeakSet();\n\n\t\t/**\n\t\t * Fires debounced event `selectionChangeDone`. It uses `lodash#debounce` method to delay function call.\n\t\t *\n\t\t * @private\n\t\t * @param {Object} data Selection change data.\n\t\t * @method #_fireSelectionChangeDoneDebounced\n\t\t */\n\t\tthis._fireSelectionChangeDoneDebounced = debounce( data => this.document.fire( 'selectionChangeDone', data ), 200 );\n\n\t\tthis._clearInfiniteLoopInterval = setInterval( () => this._clearInfiniteLoop(), 1000 );\n\n\t\t/**\n\t\t * Private property to check if the code does not enter infinite loop.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} module:engine/view/observer/selectionobserver~SelectionObserver#_loopbackCounter\n\t\t */\n\t\tthis._loopbackCounter = 0;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domElement ) {\n\t\tconst domDocument = domElement.ownerDocument;\n\n\t\t// Add listener once per each document.\n\t\tif ( this._documents.has( domDocument ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.listenTo( domDocument, 'selectionchange', () => {\n\t\t\tthis._handleSelectionChange( domDocument );\n\t\t} );\n\n\t\tthis._documents.add( domDocument );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tclearInterval( this._clearInfiniteLoopInterval );\n\t\tthis._fireSelectionChangeDoneDebounced.cancel();\n\t}\n\n\t/**\n\t * Selection change listener. {@link module:engine/view/observer/mutationobserver~MutationObserver#flush Flush} mutations, check if\n\t * selection changes and fires {@link module:engine/view/document~Document#event:selectionChange} event on every change\n\t * and {@link module:engine/view/document~Document#event:selectionChangeDone} when selection stop changing.\n\t *\n\t * @private\n\t * @param {Document} domDocument DOM document.\n\t */\n\t_handleSelectionChange( domDocument ) {\n\t\t// Selection is handled when document is not focused but is read-only. This is because in read-only\n\t\t// mode contenteditable is set as false and editor won't receive focus but we still need to know\n\t\t// selection position.\n\t\tif ( !this.isEnabled || ( !this.document.isFocused && !this.document.isReadOnly ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure the mutation event will be before selection event on all browsers.\n\t\tthis.mutationObserver.flush();\n\n\t\t// If there were mutations then the view will be re-rendered by the mutation observer and selection\n\t\t// will be updated, so selections will equal and event will not be fired, as expected.\n\t\tconst domSelection = domDocument.defaultView.getSelection();\n\t\tconst newViewSelection = this.domConverter.domSelectionToView( domSelection );\n\n\t\tif ( this.selection.isEqual( newViewSelection ) && this.domConverter.isDomSelectionCorrect( domSelection ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Ensure we are not in the infinite loop (#400).\n\t\t// This counter is reset each second. 60 selection changes in 1 second is enough high number\n\t\t// to be very difficult (impossible) to achieve using just keyboard keys (during normal editor use).\n\t\tif ( ++this._loopbackCounter > 60 ) {\n\t\t\t/**\n\t\t\t * Selection change observer detected an infinite rendering loop.\n\t\t\t * Most probably you try to put the selection in the position which is not allowed\n\t\t\t * by the browser and browser fixes it automatically what causes `selectionchange` event on\n\t\t\t * which a loopback through a model tries to re-render the wrong selection and again.\n\t\t\t *\n\t\t\t * @error selectionchange-infinite-loop\n\t\t\t */\n\t\t\tlog.warn( 'selectionchange-infinite-loop: Selection change observer detected an infinite rendering loop.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this.selection.isSimilar( newViewSelection ) ) {\n\t\t\t// If selection was equal and we are at this point of algorithm, it means that it was incorrect.\n\t\t\t// Just re-render it, no need to fire any events, etc.\n\t\t\tthis.view.render();\n\t\t} else {\n\t\t\tconst data = {\n\t\t\t\toldSelection: this.selection,\n\t\t\t\tnewSelection: newViewSelection,\n\t\t\t\tdomSelection\n\t\t\t};\n\n\t\t\t// Prepare data for new selection and fire appropriate events.\n\t\t\tthis.document.fire( 'selectionChange', data );\n\n\t\t\t// Call` #_fireSelectionChangeDoneDebounced` every time when `selectionChange` event is fired.\n\t\t\t// This function is debounced what means that `selectionChangeDone` event will be fired only when\n\t\t\t// defined int the function time will elapse since the last time the function was called.\n\t\t\t// So `selectionChangeDone` will be fired when selection will stop changing.\n\t\t\tthis._fireSelectionChangeDoneDebounced( data );\n\t\t}\n\t}\n\n\t/**\n\t * Clears `SelectionObserver` internal properties connected with preventing infinite loop.\n\t *\n\t * @protected\n\t */\n\t_clearInfiniteLoop() {\n\t\tthis._loopbackCounter = 0;\n\t}\n}\n\n/**\n * Fired when selection has changed. This event is fired only when the selection change was the only change that happened\n * in the document, and old selection is different then the new selection.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChange\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n\n/**\n * Fired when selection stops changing.\n *\n * Introduced by {@link module:engine/view/observer/selectionobserver~SelectionObserver}.\n *\n * Note that because {@link module:engine/view/observer/selectionobserver~SelectionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/selectionobserver~SelectionObserver\n * @event module:engine/view/document~Document#event:selectionChangeDone\n * @param {Object} data\n * @param {module:engine/view/documentselection~DocumentSelection} data.oldSelection Old View selection which is\n * {@link module:engine/view/document~Document#selection}.\n * @param {module:engine/view/selection~Selection} data.newSelection New View selection which is converted DOM selection.\n * @param {Selection} data.domSelection Native DOM selection.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/focusobserver\n */\n\n/* globals setTimeout, clearTimeout */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:focus Focus}\n * and {@link module:engine/view/document~Document#event:blur blur} events observer.\n * Focus observer handle also {@link module:engine/view/rooteditableelement~RootEditableElement#isFocused isFocused} property of the\n * {@link module:engine/view/rooteditableelement~RootEditableElement root elements}.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class FocusObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'focus', 'blur' ];\n\t\tthis.useCapture = true;\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'focus', () => {\n\t\t\tdocument.isFocused = true;\n\n\t\t\t// Unfortunately native `selectionchange` event is fired asynchronously.\n\t\t\t// We need to wait until `SelectionObserver` handle the event and then render. Otherwise rendering will\n\t\t\t// overwrite new DOM selection with selection from the view.\n\t\t\t// See https://github.com/ckeditor/ckeditor5-engine/issues/795 for more details.\n\t\t\t// Long timeout is needed to solve #676 and https://github.com/ckeditor/ckeditor5-engine/issues/1157 issues.\n\t\t\tthis._renderTimeoutId = setTimeout( () => view.render(), 50 );\n\t\t} );\n\n\t\tdocument.on( 'blur', ( evt, data ) => {\n\t\t\tconst selectedEditable = document.selection.editableElement;\n\n\t\t\tif ( selectedEditable === null || selectedEditable === data.target ) {\n\t\t\t\tdocument.isFocused = false;\n\n\t\t\t\t// Re-render the document to update view elements.\n\t\t\t\tview.render();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Identifier of the timeout currently used by focus listener to delay rendering execution.\n\t\t *\n\t\t * @private\n\t\t * @member {Number} #_renderTimeoutId\n\t\t */\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this._renderTimeoutId ) {\n\t\t\tclearTimeout( this._renderTimeoutId );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n}\n\n/**\n * Fired when one of the editables gets focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:focus\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when one of the editables loses focus.\n *\n * Introduced by {@link module:engine/view/observer/focusobserver~FocusObserver}.\n *\n * Note that because {@link module:engine/view/observer/focusobserver~FocusObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/focusobserver~FocusObserver\n * @event module:engine/view/document~Document#event:blur\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/compositionobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:compositionstart Compositionstart},\n * {@link module:engine/view/document~Document#event:compositionupdate compositionupdate} and\n * {@link module:engine/view/document~Document#event:compositionend compositionend} events observer.\n *\n * Note that this observer is attached by the {@link module:engine/view/view~View} and is available by default.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class CompositionObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = [ 'compositionstart', 'compositionupdate', 'compositionend' ];\n\t\tconst document = this.document;\n\n\t\tdocument.on( 'compositionstart', () => {\n\t\t\tdocument.isComposing = true;\n\t\t} );\n\n\t\tdocument.on( 'compositionend', () => {\n\t\t\tdocument.isComposing = false;\n\t\t} );\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when composition starts inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionstart\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition is updated inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionupdate\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n\n/**\n * Fired when composition ends inside one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * Note that because {@link module:engine/view/observer/compositionobserver~CompositionObserver} is attached by the\n * {@link module:engine/view/view~View} this event is available by default.\n *\n * @see module:engine/view/observer/compositionobserver~CompositionObserver\n * @event module:engine/view/document~Document#event:compositionend\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/isrange\n */\n\n/**\n * Checks if the object is a native DOM Range.\n *\n * @param {*} obj\n * @returns {Boolean}\n */\nexport default function isRange( obj ) {\n\treturn Object.prototype.toString.apply( obj ) == '[object Range]';\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/getborderwidths\n */\n\n/**\n * Returns an object containing CSS border widths of a specified HTML element.\n *\n * @param {HTMLElement} element An element which has CSS borders.\n * @param {Object} An object containing `top`, `left`, `right` and `bottom` properties\n * with numerical values of the `border-[top,left,right,bottom]-width` CSS styles.\n */\nexport default function getBorderWidths( element ) {\n\t// Call getComputedStyle on the window the element document belongs to.\n\tconst style = element.ownerDocument.defaultView.getComputedStyle( element );\n\n\treturn {\n\t\ttop: parseInt( style.borderTopWidth, 10 ),\n\t\tright: parseInt( style.borderRightWidth, 10 ),\n\t\tbottom: parseInt( style.borderBottomWidth, 10 ),\n\t\tleft: parseInt( style.borderLeftWidth, 10 )\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/rect\n */\n\nimport isRange from './isrange';\nimport isWindow from './iswindow';\nimport isElement from '../lib/lodash/isElement';\nimport getBorderWidths from './getborderwidths';\nimport log from '../log';\nimport isText from './istext';\n\n/**\n * A helper class representing a `ClientRect` object, e.g. value returned by\n * the native `object.getBoundingClientRect()` method. Provides a set of methods\n * to manipulate the rect and compare it against other rect instances.\n */\nexport default class Rect {\n\t/**\n\t * Creates an instance of rect.\n\t *\n\t *\t\t// Rect of an HTMLElement.\n\t *\t\tconst rectA = new Rect( document.body );\n\t *\n\t *\t\t// Rect of a DOM Range.\n\t *\t\tconst rectB = new Rect( document.getSelection().getRangeAt( 0 ) );\n\t *\n\t *\t\t// Rect of a window (web browser viewport).\n\t *\t\tconst rectC = new Rect( window );\n\t *\n\t *\t\t// Rect out of an object.\n\t *\t\tconst rectD = new Rect( { top: 0, right: 10, bottom: 10, left: 0, width: 10, height: 10 } );\n\t *\n\t *\t\t// Rect out of another Rect instance.\n\t *\t\tconst rectE = new Rect( rectD );\n\t *\n\t *\t\t// Rect out of a ClientRect.\n\t *\t\tconst rectF = new Rect( document.body.getClientRects().item( 0 ) );\n\t *\n\t * **Note**: By default a rect of an HTML element includes its CSS borders and scrollbars (if any)\n\t * ant the rect of a `window` includes scrollbars too. Use {@link #excludeScrollbarsAndBorders}\n\t * to get the inner part of the rect.\n\t *\n\t * @param {HTMLElement|Range|Window|ClientRect|module:utils/dom/rect~Rect|Object} source A source object to create the rect.\n\t */\n\tconstructor( source ) {\n\t\tconst isSourceRange = isRange( source );\n\n\t\t/**\n\t\t * The object this rect is for.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {HTMLElement|Range|ClientRect|module:utils/dom/rect~Rect|Object} #_source\n\t\t */\n\t\tObject.defineProperty( this, '_source', {\n\t\t\t// If the source is a Rect instance, copy it's #_source.\n\t\t\tvalue: source._source || source,\n\t\t\twritable: true,\n\t\t\tenumerable: false\n\t\t} );\n\n\t\tif ( isElement( source ) || isSourceRange ) {\n\t\t\tconst sourceNode = isSourceRange ? source.startContainer : source;\n\n\t\t\tif ( !sourceNode.ownerDocument || !sourceNode.ownerDocument.body.contains( sourceNode ) ) {\n\t\t\t\t/**\n\t\t\t\t * The `Rect` class depends on `getBoundingClientRect` and `getClientRects` DOM methods.\n\t\t\t\t * If the {@link #constructor source} of a rect in an HTML element or a DOM range but it does\n\t\t\t\t * not belong to any rendered DOM tree, these methods will fail to obtain the geometry and\n\t\t\t\t * the rect instance makes little sense to the features using it.\n\t\t\t\t *\n\t\t\t\t * To get rid of this warning make sure the source passed to the constructor\n\t\t\t\t * is a descendant of `window.document.body`.\n\t\t\t\t *\n\t\t\t\t * @error rect-source-not-in-dom\n\t\t\t\t * @param {String} source The source of the Rect instance.\n\t\t\t\t */\n\t\t\t\tlog.warn(\n\t\t\t\t\t'rect-source-not-in-dom: The source of this rect does not belong to any rendered DOM tree.',\n\t\t\t\t\t{ source }\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( isSourceRange ) {\n\t\t\t\tcopyRectProperties( this, Rect.getDomRangeRects( source )[ 0 ] );\n\t\t\t} else {\n\t\t\t\tcopyRectProperties( this, source.getBoundingClientRect() );\n\t\t\t}\n\t\t} else if ( isWindow( source ) ) {\n\t\t\tconst { innerWidth, innerHeight } = source;\n\n\t\t\tcopyRectProperties( this, {\n\t\t\t\ttop: 0,\n\t\t\t\tright: innerWidth,\n\t\t\t\tbottom: innerHeight,\n\t\t\t\tleft: 0,\n\t\t\t\twidth: innerWidth,\n\t\t\t\theight: innerHeight\n\t\t\t} );\n\t\t} else {\n\t\t\tcopyRectProperties( this, source );\n\t\t}\n\n\t\t/**\n\t\t * The \"top\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #top\n\t\t */\n\n\t\t/**\n\t\t * The \"right\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #right\n\t\t */\n\n\t\t/**\n\t\t * The \"bottom\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #bottom\n\t\t */\n\n\t\t/**\n\t\t * The \"left\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #left\n\t\t */\n\n\t\t/**\n\t\t * The \"width\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #width\n\t\t */\n\n\t\t/**\n\t\t * The \"height\" value of the rect.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #height\n\t\t */\n\t}\n\n\t/**\n\t * Returns a clone of the rect.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A cloned rect.\n\t */\n\tclone() {\n\t\treturn new Rect( this );\n\t}\n\n\t/**\n\t * Moves the rect so that its upper–left corner lands in desired `[ x, y ]` location.\n\t *\n\t * @param {Number} x Desired horizontal location.\n\t * @param {Number} y Desired vertical location.\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveTo( x, y ) {\n\t\tthis.top = y;\n\t\tthis.right = x + this.width;\n\t\tthis.bottom = y + this.height;\n\t\tthis.left = x;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves the rect in–place by a dedicated offset.\n\t *\n\t * @param {Number} x A horizontal offset.\n\t * @param {Number} y A vertical offset\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been moved.\n\t */\n\tmoveBy( x, y ) {\n\t\tthis.top += y;\n\t\tthis.right += x;\n\t\tthis.left += x;\n\t\tthis.bottom += y;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns a new rect a a result of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {module:utils/dom/rect~Rect}\n\t */\n\tgetIntersection( anotherRect ) {\n\t\tconst rect = {\n\t\t\ttop: Math.max( this.top, anotherRect.top ),\n\t\t\tright: Math.min( this.right, anotherRect.right ),\n\t\t\tbottom: Math.min( this.bottom, anotherRect.bottom ),\n\t\t\tleft: Math.max( this.left, anotherRect.left )\n\t\t};\n\n\t\trect.width = rect.right - rect.left;\n\t\trect.height = rect.bottom - rect.top;\n\n\t\tif ( rect.width < 0 || rect.height < 0 ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\treturn new Rect( rect );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of intersection with another rect.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect [description]\n\t * @returns {Number} Area of intersection.\n\t */\n\tgetIntersectionArea( anotherRect ) {\n\t\tconst rect = this.getIntersection( anotherRect );\n\n\t\tif ( rect ) {\n\t\t\treturn rect.getArea();\n\t\t} else {\n\t\t\treturn 0;\n\t\t}\n\t}\n\n\t/**\n\t * Returns the area of the rect.\n\t *\n\t * @returns {Number}\n\t */\n\tgetArea() {\n\t\treturn this.width * this.height;\n\t}\n\n\t/**\n\t * Returns a new rect, a part of the original rect, which is actually visible to the user,\n\t * e.g. an original rect cropped by parent element rects which have `overflow` set in CSS\n\t * other than `\"visible\"`.\n\t *\n\t * If there's no such visible rect, which is when the rect is limited by one or many of\n\t * the ancestors, `null` is returned.\n\t *\n\t * @returns {module:utils/dom/rect~Rect|null} A visible rect instance or `null`, if there's none.\n\t */\n\tgetVisible() {\n\t\tconst source = this._source;\n\t\tlet visibleRect = this.clone();\n\n\t\t// There's no ancestor to crop <body> with the overflow.\n\t\tif ( !isBody( source ) ) {\n\t\t\tlet parent = source.parentNode || source.commonAncestorContainer;\n\n\t\t\t// Check the ancestors all the way up to the <body>.\n\t\t\twhile ( parent && !isBody( parent ) ) {\n\t\t\t\tconst parentRect = new Rect( parent );\n\t\t\t\tconst intersectionRect = visibleRect.getIntersection( parentRect );\n\n\t\t\t\tif ( intersectionRect ) {\n\t\t\t\t\tif ( intersectionRect.getArea() < visibleRect.getArea() ) {\n\t\t\t\t\t\t// Reduce the visible rect to the intersection.\n\t\t\t\t\t\tvisibleRect = intersectionRect;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\t// There's no intersection, the rect is completely invisible.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tparent = parent.parentNode;\n\t\t\t}\n\t\t}\n\n\t\treturn visibleRect;\n\t}\n\n\t/**\n\t * Checks if all property values ({@link #top}, {@link #left}, {@link #right},\n\t * {@link #bottom}, {@link #width} and {@link #height}) are the equal in both rect\n\t * instances.\n\t *\n\t * @param {module:utils/dom/rect~Rect} rect A rect instance to compare with.\n\t * @returns {Boolean} `true` when Rects are equal. `false` otherwise.\n\t */\n\tisEqual( anotherRect ) {\n\t\tfor ( const prop of rectProperties ) {\n\t\t\tif ( this[ prop ] !== anotherRect[ prop ] ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether a rect fully contains another rect instance.\n\t *\n\t * @param {module:utils/dom/rect~Rect} anotherRect\n\t * @returns {Boolean} `true` if contains, `false` otherwise.\n\t */\n\tcontains( anotherRect ) {\n\t\tconst intersectRect = this.getIntersection( anotherRect );\n\n\t\treturn !!( intersectRect && intersectRect.isEqual( anotherRect ) );\n\t}\n\n\t/**\n\t * Excludes scrollbars and CSS borders from the rect.\n\t *\n\t * * Borders are removed when {@link #_source} is an HTML element.\n\t * * Scrollbars are excluded from HTML elements and the `window`.\n\t *\n\t * @returns {module:utils/dom/rect~Rect} A rect which has been updated.\n\t */\n\texcludeScrollbarsAndBorders() {\n\t\tconst source = this._source;\n\t\tlet scrollBarWidth, scrollBarHeight;\n\n\t\tif ( isWindow( source ) ) {\n\t\t\tscrollBarWidth = source.innerWidth - source.document.documentElement.clientWidth;\n\t\t\tscrollBarHeight = source.innerHeight - source.document.documentElement.clientHeight;\n\t\t} else {\n\t\t\tconst borderWidths = getBorderWidths( this._source );\n\n\t\t\tscrollBarWidth = source.offsetWidth - source.clientWidth;\n\t\t\tscrollBarHeight = source.offsetHeight - source.clientHeight;\n\n\t\t\tthis.moveBy( borderWidths.left, borderWidths.top );\n\t\t}\n\n\t\t// Assuming LTR scrollbars. TODO: RTL.\n\t\tthis.width -= scrollBarWidth;\n\t\tthis.right -= scrollBarWidth;\n\n\t\tthis.height -= scrollBarHeight;\n\t\tthis.bottom -= scrollBarHeight;\n\n\t\treturn this;\n\t}\n\n\t/**\n\t * Returns an array of rects of the given native DOM Range.\n\t *\n\t * @param {Range} range A native DOM range.\n\t * @returns {Array.<module:utils/dom/rect~Rect>} DOM Range rects.\n\t */\n\tstatic getDomRangeRects( range ) {\n\t\tconst rects = [];\n\t\t// Safari does not iterate over ClientRectList using for...of loop.\n\t\tconst clientRects = Array.from( range.getClientRects() );\n\n\t\tif ( clientRects.length ) {\n\t\t\tfor ( const rect of clientRects ) {\n\t\t\t\trects.push( new Rect( rect ) );\n\t\t\t}\n\t\t}\n\t\t// If there's no client rects for the Range, use parent container's bounding rect\n\t\t// instead and adjust rect's width to simulate the actual geometry of such range.\n\t\t// https://github.com/ckeditor/ckeditor5-utils/issues/153\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/317\n\t\telse {\n\t\t\tlet startContainer = range.startContainer;\n\n\t\t\tif ( isText( startContainer ) ) {\n\t\t\t\tstartContainer = startContainer.parentNode;\n\t\t\t}\n\n\t\t\tconst rect = new Rect( startContainer.getBoundingClientRect() );\n\t\t\trect.right = rect.left;\n\t\t\trect.width = 0;\n\n\t\t\trects.push( rect );\n\t\t}\n\n\t\treturn rects;\n\t}\n}\n\nconst rectProperties = [ 'top', 'right', 'bottom', 'left', 'width', 'height' ];\n\n// Acquires all the rect properties from the passed source.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} rect\n// @param {ClientRect|module:utils/dom/rect~Rect|Object} source\nfunction copyRectProperties( rect, source ) {\n\tfor ( const p of rectProperties ) {\n\t\trect[ p ] = source[ p ];\n\t}\n}\n\n// Checks if provided object is a <body> HTML element.\n//\n// @private\n// @param {HTMLElement|Range} elementOrRange\n// @returns {Boolean}\nfunction isBody( elementOrRange ) {\n\tif ( !isElement( elementOrRange ) ) {\n\t\treturn false;\n\t}\n\n\treturn elementOrRange === elementOrRange.ownerDocument.body;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/scroll\n */\n\nimport isRange from './isrange';\nimport Rect from './rect';\nimport isText from './istext';\n\nconst utils = {};\n\n/**\n * Makes any page `HTMLElement` or `Range` (`target`) visible inside the browser viewport.\n * This helper will scroll all `target` ancestors and the web browser viewport to reveal the target to\n * the user. If the `target` is already visible, nothing will happen.\n *\n * @param {HTMLElement|Range} options.target A target, which supposed to become visible to the user.\n * @param {Number} [options.viewportOffset] An offset from the edge of the viewport (in pixels)\n * the `target` will be moved by when the viewport is scrolled. It enhances the user experience\n * by keeping the `target` some distance from the edge of the viewport and thus making it easier to\n * read or edit by the user.\n */\nexport function scrollViewportToShowTarget( { target, viewportOffset = 0 } ) {\n\tconst targetWindow = getWindow( target );\n\tlet currentWindow = targetWindow;\n\tlet currentFrame = null;\n\n\t// Iterate over all windows, starting from target's parent window up to window#top.\n\twhile ( currentWindow ) {\n\t\tlet firstAncestorToScroll;\n\n\t\t// Let's scroll target's ancestors first to reveal it. Then, once the ancestor scrolls\n\t\t// settled down, the algorithm can eventually scroll the viewport of the current window.\n\t\t//\n\t\t// Note: If the current window is target's **original** window (e.g. the first one),\n\t\t// start scrolling the closest parent of the target. If not, scroll the closest parent\n\t\t// of an iframe that resides in the current window.\n\t\tif ( currentWindow == targetWindow ) {\n\t\t\tfirstAncestorToScroll = getParentElement( target );\n\t\t} else {\n\t\t\tfirstAncestorToScroll = getParentElement( currentFrame );\n\t\t}\n\n\t\t// Scroll the target's ancestors first. Once done, scrolling the viewport is easy.\n\t\tscrollAncestorsToShowRect( firstAncestorToScroll, () => {\n\t\t\t// Note: If the target does not belong to the current window **directly**,\n\t\t\t// i.e. it resides in an iframe belonging to the window, obtain the target's rect\n\t\t\t// in the coordinates of the current window. By default, a Rect returns geometry\n\t\t\t// relative to the current window's viewport. To make it work in a parent window,\n\t\t\t// it must be shifted.\n\t\t\treturn getRectRelativeToWindow( target, currentWindow );\n\t\t} );\n\n\t\t// Obtain the rect of the target after it has been scrolled within its ancestors.\n\t\t// It's time to scroll the viewport.\n\t\tconst targetRect = getRectRelativeToWindow( target, currentWindow );\n\n\t\tscrollWindowToShowRect( currentWindow, targetRect, viewportOffset );\n\n\t\tif ( currentWindow.parent != currentWindow ) {\n\t\t\t// Keep the reference to the <iframe> element the \"previous current window\" was\n\t\t\t// rendered within. It will be useful to re–calculate the rect of the target\n\t\t\t// in the parent window's relative geometry. The target's rect must be shifted\n\t\t\t// by it's iframe's position.\n\t\t\tcurrentFrame = currentWindow.frameElement;\n\t\t\tcurrentWindow = currentWindow.parent;\n\n\t\t\t// If the current window has some parent but frameElement is inaccessible, then they have\n\t\t\t// different domains/ports and, due to security reasons, accessing and scrolling\n\t\t\t// the parent window won't be possible.\n\t\t\t// See https://github.com/ckeditor/ckeditor5/issues/930.\n\t\t\tif ( !currentFrame ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t} else {\n\t\t\tcurrentWindow = null;\n\t\t}\n\t}\n}\n\n/**\n * Makes any page `HTMLElement` or `Range` (target) visible within its scrollable ancestors,\n * e.g. if they have `overflow: scroll` CSS style.\n *\n * @param {HTMLElement|Range} target A target, which supposed to become visible to the user.\n */\nexport function scrollAncestorsToShowTarget( target ) {\n\tconst targetParent = getParentElement( target );\n\n\tscrollAncestorsToShowRect( targetParent, () => {\n\t\treturn new Rect( target );\n\t} );\n}\n\n// TODO: Using a property value shorthand in the top of the file\n// causes JSDoc to throw errors. See https://github.com/cksource/docs-builder/issues/75.\nObject.assign( utils, {\n\tscrollViewportToShowTarget,\n\tscrollAncestorsToShowTarget\n} );\n\n// Makes a given rect visible within its parent window.\n//\n// Note: Avoid the situation where the caret is still in the viewport, but totally\n// at the edge of it. In such situation, if it moved beyond the viewport in the next\n// action e.g. after paste, the scrolling would move it to the viewportOffset level\n// and it all would look like the caret visually moved up/down:\n//\n// 1.\n//\t\t| foo[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// 2. *paste*\n// 3.\n//\t\t|\n//\t\t|\n//\t\t+-foo-----------------------------...\n//\t\t  bar[]                              <--- caret below viewport, scrolling...\n//\n// 4. *scrolling*\n// 5.\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]                              <--- caret precisely at the edge\n//\t\t+---------------------------------...\n//\n// To prevent this, this method checks the rects moved by the viewportOffset to cover\n// the upper/lower edge of the viewport. It makes sure if the action repeats, there's\n// no twitching – it's a purely visual improvement:\n//\n// 5. (after fix)\n//\t\t|\n//\t\t| foo\n//\t\t| bar[]\n//\t\t|                                    <--- N px of space below the caret\n//\t\t+---------------------------------...\n//\n// @private\n// @param {Window} window A window which is scrolled to reveal the rect.\n// @param {module:utils/dom/rect~Rect} rect A rect which is to be revealed.\n// @param {Number} viewportOffset See scrollViewportToShowTarget.\nfunction scrollWindowToShowRect( window, rect, viewportOffset ) {\n\tconst targetShiftedDownRect = rect.clone().moveBy( 0, viewportOffset );\n\tconst targetShiftedUpRect = rect.clone().moveBy( 0, -viewportOffset );\n\tconst viewportRect = new Rect( window ).excludeScrollbarsAndBorders();\n\n\tconst rects = [ targetShiftedUpRect, targetShiftedDownRect ];\n\n\tif ( !rects.every( rect => viewportRect.contains( rect ) ) ) {\n\t\tlet { scrollX, scrollY } = window;\n\n\t\tif ( isAbove( targetShiftedUpRect, viewportRect ) ) {\n\t\t\tscrollY -= viewportRect.top - rect.top + viewportOffset;\n\t\t} else if ( isBelow( targetShiftedDownRect, viewportRect ) ) {\n\t\t\tscrollY += rect.bottom - viewportRect.bottom + viewportOffset;\n\t\t}\n\n\t\t// TODO: Web browsers scroll natively to place the target in the middle\n\t\t// of the viewport. It's not a very popular case, though.\n\t\tif ( isLeftOf( rect, viewportRect ) ) {\n\t\t\tscrollX -= viewportRect.left - rect.left + viewportOffset;\n\t\t} else if ( isRightOf( rect, viewportRect ) ) {\n\t\t\tscrollX += rect.right - viewportRect.right + viewportOffset;\n\t\t}\n\n\t\twindow.scrollTo( scrollX, scrollY );\n\t}\n}\n\n// Recursively scrolls element ancestors to visually reveal a rect.\n//\n// @private\n// @param {HTMLElement} A parent The first ancestors to start scrolling.\n// @param {Function} getRect A function which returns the Rect, which is to be revealed.\nfunction scrollAncestorsToShowRect( parent, getRect ) {\n\tconst parentWindow = getWindow( parent );\n\tlet parentRect, targetRect;\n\n\twhile ( parent != parentWindow.document.body ) {\n\t\ttargetRect = getRect();\n\t\tparentRect = new Rect( parent ).excludeScrollbarsAndBorders();\n\n\t\tif ( !parentRect.contains( targetRect ) ) {\n\t\t\tif ( isAbove( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop -= parentRect.top - targetRect.top;\n\t\t\t} else if ( isBelow( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollTop += targetRect.bottom - parentRect.bottom;\n\t\t\t}\n\n\t\t\tif ( isLeftOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft -= parentRect.left - targetRect.left;\n\t\t\t} else if ( isRightOf( targetRect, parentRect ) ) {\n\t\t\t\tparent.scrollLeft += targetRect.right - parentRect.right;\n\t\t\t}\n\t\t}\n\n\t\tparent = parent.parentNode;\n\t}\n}\n\n// Determines if a given `Rect` extends beyond the bottom edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isBelow( firstRect, secondRect ) {\n\treturn firstRect.bottom > secondRect.bottom;\n}\n\n// Determines if a given `Rect` extends beyond the top edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isAbove( firstRect, secondRect ) {\n\treturn firstRect.top < secondRect.top;\n}\n\n// Determines if a given `Rect` extends beyond the left edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isLeftOf( firstRect, secondRect ) {\n\treturn firstRect.left < secondRect.left;\n}\n\n// Determines if a given `Rect` extends beyond the right edge of the second `Rect`.\n//\n// @private\n// @param {module:utils/dom/rect~Rect} firstRect\n// @param {module:utils/dom/rect~Rect} secondRect\nfunction isRightOf( firstRect, secondRect ) {\n\treturn firstRect.right > secondRect.right;\n}\n\n// Returns the closest window of an element or range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {Window}\nfunction getWindow( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\treturn elementOrRange.startContainer.ownerDocument.defaultView;\n\t} else {\n\t\treturn elementOrRange.ownerDocument.defaultView;\n\t}\n}\n\n// Returns the closest parent of an element or DOM range.\n//\n// @private\n// @param {HTMLElement|Range} firstRect\n// @returns {HTMLelement}\nfunction getParentElement( elementOrRange ) {\n\tif ( isRange( elementOrRange ) ) {\n\t\tlet parent = elementOrRange.commonAncestorContainer;\n\n\t\t// If a Range is attached to the Text, use the closest element ancestor.\n\t\tif ( isText( parent ) ) {\n\t\t\tparent = parent.parentNode;\n\t\t}\n\n\t\treturn parent;\n\t} else {\n\t\treturn elementOrRange.parentNode;\n\t}\n}\n\n// Returns the rect of an element or range residing in an iframe.\n// The result rect is relative to the geometry of the passed window instance.\n//\n// @private\n// @param {HTMLElement|Range} target Element or range which rect should be returned.\n// @param {Window} relativeWindow A window the rect should be relative to.\n// @returns {module:utils/dom/rect~Rect}\nfunction getRectRelativeToWindow( target, relativeWindow ) {\n\tconst targetWindow = getWindow( target );\n\tconst rect = new Rect( target );\n\n\tif ( targetWindow === relativeWindow ) {\n\t\treturn rect;\n\t} else {\n\t\tlet currentWindow = targetWindow;\n\n\t\twhile ( currentWindow != relativeWindow ) {\n\t\t\tconst frame = currentWindow.frameElement;\n\t\t\tconst frameRect = new Rect( frame ).excludeScrollbarsAndBorders();\n\n\t\t\trect.moveBy( frameRect.left, frameRect.top );\n\n\t\t\tcurrentWindow = currentWindow.parent;\n\t\t}\n\t}\n\n\treturn rect;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/view\n */\n\nimport Document from './document';\nimport Writer from './writer';\nimport Renderer from './renderer';\nimport DomConverter from './domconverter';\n\nimport MutationObserver from './observer/mutationobserver';\nimport KeyObserver from './observer/keyobserver';\nimport FakeSelectionObserver from './observer/fakeselectionobserver';\nimport SelectionObserver from './observer/selectionobserver';\nimport FocusObserver from './observer/focusobserver';\nimport CompositionObserver from './observer/compositionobserver';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { scrollViewportToShowTarget } from '@ckeditor/ckeditor5-utils/src/dom/scroll';\nimport { injectUiElementHandling } from './uielement';\nimport { injectQuirksHandling } from './filler';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Editor's view controller class. Its main responsibility is DOM - View management for editing purposes, to provide\n * abstraction over the DOM structure and events and hide all browsers quirks.\n *\n * View controller renders view document to DOM whenever view structure changes. To determine when view can be rendered,\n * all changes need to be done using the {@link module:engine/view/view~View#change} method, using\n * {@link module:engine/view/writer~Writer}:\n *\n *\t\tview.change( writer => {\n *\t\t\twriter.insert( position, writer.createText( 'foo' ) );\n *\t\t} );\n *\n * View controller also register {@link module:engine/view/observer/observer~Observer observers} which observes changes\n * on DOM and fire events on the {@link module:engine/view/document~Document Document}.\n * Note that the following observers are added by the class constructor and are always available:\n *\n * * {@link module:engine/view/observer/mutationobserver~MutationObserver},\n * * {@link module:engine/view/observer/selectionobserver~SelectionObserver},\n * * {@link module:engine/view/observer/focusobserver~FocusObserver},\n * * {@link module:engine/view/observer/keyobserver~KeyObserver},\n * * {@link module:engine/view/observer/fakeselectionobserver~FakeSelectionObserver}.\n * * {@link module:engine/view/observer/compositionobserver~CompositionObserver}.\n *\n * This class also {@link module:engine/view/view~View#attachDomRoot bind DOM and View elements}.\n *\n * If you do not need full DOM - View management, and want to only transform the tree of view elements to the DOM\n * elements you do not need this controller, you can use the {@link module:engine/view/domconverter~DomConverter DomConverter}.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class View {\n\tconstructor() {\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/document~Document} associated with this view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/document~Document} module:engine/view/view~View#document\n\t\t */\n\t\tthis.document = new Document();\n\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/domconverter~DomConverter domConverter} use by\n\t\t * {@link module:engine/view/view~View#renderer renderer}\n\t\t * and {@link module:engine/view/observer/observer~Observer observers}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/domconverter~DomConverter} module:engine/view/view~View#domConverter\n\t\t */\n\t\tthis.domConverter = new DomConverter();\n\n\t\t/**\n\t\t * Instance of the {@link module:engine/view/renderer~Renderer renderer}.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:engine/view/renderer~Renderer} module:engine/view/view~View#renderer\n\t\t */\n\t\tthis._renderer = new Renderer( this.domConverter, this.document.selection );\n\t\tthis._renderer.bind( 'isFocused' ).to( this.document );\n\n\t\t/**\n\t\t * Roots of the DOM tree. Map on the `HTMLElement`s with roots names as keys.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Map} module:engine/view/view~View#domRoots\n\t\t */\n\t\tthis.domRoots = new Map();\n\n\t\t/**\n\t\t * Map of registered {@link module:engine/view/observer/observer~Observer observers}.\n\t\t *\n\t\t * @private\n\t\t * @member {Map.<Function, module:engine/view/observer/observer~Observer>} module:engine/view/view~View#_observers\n\t\t */\n\t\tthis._observers = new Map();\n\n\t\t/**\n\t\t * Is set to `true` when {@link #change view changes} are currently in progress.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean} module:engine/view/view~View#_ongoingChange\n\t\t */\n\t\tthis._ongoingChange = false;\n\n\t\t/**\n\t\t * Used to prevent calling {@link #render} and {@link #change} during rendering view to the DOM.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean} module:engine/view/view~View#_renderingInProgress\n\t\t */\n\t\tthis._renderingInProgress = false;\n\n\t\t/**\n\t\t * Used to prevent calling {@link #render} and {@link #change} during rendering view to the DOM.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean} module:engine/view/view~View#_renderingInProgress\n\t\t */\n\t\tthis._postFixersInProgress = false;\n\n\t\t/**\n\t\t * Writer instance used in {@link #change change method) callbacks.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/writer~Writer} module:engine/view/view~View#_writer\n\t\t */\n\t\tthis._writer = new Writer( this.document );\n\n\t\t// Add default observers.\n\t\tthis.addObserver( MutationObserver );\n\t\tthis.addObserver( SelectionObserver );\n\t\tthis.addObserver( FocusObserver );\n\t\tthis.addObserver( KeyObserver );\n\t\tthis.addObserver( FakeSelectionObserver );\n\t\tthis.addObserver( CompositionObserver );\n\n\t\t// Inject quirks handlers.\n\t\tinjectQuirksHandling( this );\n\t\tinjectUiElementHandling( this );\n\n\t\t// Use 'normal' priority so that rendering is performed as first when using that priority.\n\t\tthis.on( 'render', () => {\n\t\t\tthis._render();\n\n\t\t\t// Informs that layout has changed after render.\n\t\t\tthis.document.fire( 'layoutChanged' );\n\t\t} );\n\t}\n\n\t/**\n\t * Attaches DOM root element to the view element and enable all observers on that element.\n\t * Also {@link module:engine/view/renderer~Renderer#markToSync mark element} to be synchronized with the view\n\t * what means that all child nodes will be removed and replaced with content of the view root.\n\t *\n\t * This method also will change view element name as the same as tag name of given dom root.\n\t * Name is always transformed to lower case.\n\t *\n\t * @param {Element} domRoot DOM root element.\n\t * @param {String} [name='main'] Name of the root.\n\t */\n\tattachDomRoot( domRoot, name = 'main' ) {\n\t\tconst viewRoot = this.document.getRoot( name );\n\n\t\t// Set view root name the same as DOM root tag name.\n\t\tviewRoot._name = domRoot.tagName.toLowerCase();\n\n\t\tthis.domRoots.set( name, domRoot );\n\t\tthis.domConverter.bindElements( domRoot, viewRoot );\n\t\tthis._renderer.markToSync( 'children', viewRoot );\n\t\tthis._renderer.domDocuments.add( domRoot.ownerDocument );\n\n\t\tviewRoot.on( 'change:children', ( evt, node ) => this._renderer.markToSync( 'children', node ) );\n\t\tviewRoot.on( 'change:attributes', ( evt, node ) => this._renderer.markToSync( 'attributes', node ) );\n\t\tviewRoot.on( 'change:text', ( evt, node ) => this._renderer.markToSync( 'text', node ) );\n\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.observe( domRoot, name );\n\t\t}\n\t}\n\n\t/**\n\t * Gets DOM root element.\n\t *\n\t * @param {String} [name='main']  Name of the root.\n\t * @returns {Element} DOM root element instance.\n\t */\n\tgetDomRoot( name = 'main' ) {\n\t\treturn this.domRoots.get( name );\n\t}\n\n\t/**\n\t * Creates observer of the given type if not yet created, {@link module:engine/view/observer/observer~Observer#enable enables} it\n\t * and {@link module:engine/view/observer/observer~Observer#observe attaches} to all existing and future\n\t * {@link #domRoots DOM roots}.\n\t *\n\t * Note: Observers are recognized by their constructor (classes). A single observer will be instantiated and used only\n\t * when registered for the first time. This means that features and other components can register a single observer\n\t * multiple times without caring whether it has been already added or not.\n\t *\n\t * @param {Function} Observer The constructor of an observer to add.\n\t * Should create an instance inheriting from {@link module:engine/view/observer/observer~Observer}.\n\t * @returns {module:engine/view/observer/observer~Observer} Added observer instance.\n\t */\n\taddObserver( Observer ) {\n\t\tlet observer = this._observers.get( Observer );\n\n\t\tif ( observer ) {\n\t\t\treturn observer;\n\t\t}\n\n\t\tobserver = new Observer( this );\n\n\t\tthis._observers.set( Observer, observer );\n\n\t\tfor ( const [ name, domElement ] of this.domRoots ) {\n\t\t\tobserver.observe( domElement, name );\n\t\t}\n\n\t\tobserver.enable();\n\n\t\treturn observer;\n\t}\n\n\t/**\n\t * Returns observer of the given type or `undefined` if such observer has not been added yet.\n\t *\n\t * @param {Function} Observer The constructor of an observer to get.\n\t * @returns {module:engine/view/observer/observer~Observer|undefined} Observer instance or undefined.\n\t */\n\tgetObserver( Observer ) {\n\t\treturn this._observers.get( Observer );\n\t}\n\n\t/**\n\t * Disables all added observers.\n\t */\n\tdisableObservers() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.disable();\n\t\t}\n\t}\n\n\t/**\n\t * Enables all added observers.\n\t */\n\tenableObservers() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.enable();\n\t\t}\n\t}\n\n\t/**\n\t * Scrolls the page viewport and {@link #domRoots} with their ancestors to reveal the\n\t * caret, if not already visible to the user.\n\t */\n\tscrollToTheSelection() {\n\t\tconst range = this.document.selection.getFirstRange();\n\n\t\tif ( range ) {\n\t\t\tscrollViewportToShowTarget( {\n\t\t\t\ttarget: this.domConverter.viewRangeToDom( range ),\n\t\t\t\tviewportOffset: 20\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * It will focus DOM element representing {@link module:engine/view/editableelement~EditableElement EditableElement}\n\t * that is currently having selection inside.\n\t */\n\tfocus() {\n\t\tif ( !this.document.isFocused ) {\n\t\t\tconst editable = this.document.selection.editableElement;\n\n\t\t\tif ( editable ) {\n\t\t\t\tthis.domConverter.focus( editable );\n\t\t\t\tthis.render();\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * Before focusing view document, selection should be placed inside one of the view's editables.\n\t\t\t\t * Normally its selection will be converted from model document (which have default selection), but\n\t\t\t\t * when using view document on its own, we need to manually place selection before focusing it.\n\t\t\t\t *\n\t\t\t\t * @error view-focus-no-selection\n\t\t\t\t */\n\t\t\t\tlog.warn( 'view-focus-no-selection: There is no selection in any editable to focus.' );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Change method is the primary way of changing the view. You should use it to modify any node in the view tree.\n\t * It makes sure that after all changes are made view is rendered to DOM. It prevents situations when DOM is updated\n\t * when view state is not yet correct. It allows to nest calls one inside another and still perform single rendering\n\t * after all changes are applied.\n\t *\n\t *\t\tview.change( writer => {\n\t *\t\t\twriter.insert( position1, writer.createText( 'foo' ) );\n\t *\n\t *\t\t\tview.change( writer => {\n\t *\t\t\t\twriter.insert( position2, writer.createText( 'bar' ) );\n\t *\t\t\t} );\n\t *\n\t * \t\t\twriter.remove( range );\n\t *\t\t} );\n\t *\n\t * Change block is executed immediately.\n\t *\n\t * When the outermost change block is done and rendering to DOM is over it fires\n\t * {@link module:engine/view/view~View#event:render} event.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `applying-view-changes-on-rendering` when\n\t * change block is used after rendering to DOM has started.\n\t *\n\t * @param {Function} callback Callback function which may modify the view.\n\t */\n\tchange( callback ) {\n\t\tif ( this._renderingInProgress || this._postFixersInProgress ) {\n\t\t\t/**\n\t\t\t * Thrown when there is an attempt to make changes to the view tree when it is in incorrect state. This may\n\t\t\t * cause some unexpected behaviour and inconsistency between the DOM and the view.\n\t\t\t * This may be caused by:\n\t\t\t *\n\t\t\t * * calling {@link #change} or {@link #render} during rendering process,\n\t\t\t * * calling {@link #change} or {@link #render} inside of\n\t\t\t *   {@link module:engine/view/document~Document#registerPostFixer post-fixer function}.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'cannot-change-view-tree: ' +\n\t\t\t\t'Attempting to make changes to the view when it is in incorrect state: rendering or post-fixers are in progress. ' +\n\t\t\t\t'This may cause some unexpected behaviour and inconsistency between the DOM and the view.'\n\t\t\t);\n\t\t}\n\n\t\t// Recursive call to view.change() method - execute listener immediately.\n\t\tif ( this._ongoingChange ) {\n\t\t\tcallback( this._writer );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// This lock will assure that all recursive calls to view.change() will end up in same block - one \"render\"\n\t\t// event for all nested calls.\n\t\tthis._ongoingChange = true;\n\t\tcallback( this._writer );\n\t\tthis._ongoingChange = false;\n\n\t\t// Execute all document post-fixers after the change.\n\t\tthis._postFixersInProgress = true;\n\t\tthis.document._callPostFixers( this._writer );\n\t\tthis._postFixersInProgress = false;\n\n\t\tthis.fire( 'render' );\n\t}\n\n\t/**\n\t * Renders {@link module:engine/view/document~Document view document} to DOM. If any view changes are\n\t * currently in progress, rendering will start after all {@link #change change blocks} are processed.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `applying-view-changes-on-rendering` when\n\t * trying to re-render when rendering to DOM has already started.\n\t */\n\trender() {\n\t\tthis.change( () => {} );\n\t}\n\n\t/**\n\t * Destroys this instance. Makes sure that all observers are destroyed and listeners removed.\n\t */\n\tdestroy() {\n\t\tfor ( const observer of this._observers.values() ) {\n\t\t\tobserver.destroy();\n\t\t}\n\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Renders all changes. In order to avoid triggering the observers (e.g. mutations) all observers are disabled\n\t * before rendering and re-enabled after that.\n\t *\n\t * @private\n\t */\n\t_render() {\n\t\tthis._renderingInProgress = true;\n\t\tthis.disableObservers();\n\t\tthis._renderer.render();\n\t\tthis.enableObservers();\n\t\tthis._renderingInProgress = false;\n\t}\n\n\t/**\n\t * Fired after a topmost {@link module:engine/view/view~View#change change block} and all\n\t * {@link module:engine/view/document~Document#registerPostFixer post-fixers} are executed.\n\t *\n\t * Actual rendering is performed as a first listener on 'normal' priority.\n\t *\n\t *\t\tview.on( 'render', () => {\n\t *\t\t\t// Rendering to the DOM is complete.\n\t *\t\t} );\n\t *\n\t * This event is useful when you want to update interface elements after the rendering, e.g. position of the\n\t * balloon panel. If you wants to change view structure use\n\t * {@link module:engine/view/document~Document#registerPostFixer post-fixers}.\n\t *\n\t * @event module:engine/view/view~View#event:render\n\t */\n}\n\nmix( View, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/tomap\n */\n\nimport isPlainObject from './lib/lodash/isPlainObject';\nimport objectToMap from './objecttomap';\n\n/**\n * Transforms object or iterable to map. Iterable needs to be in the format acceptable by the `Map` constructor.\n *\n *\t\tmap = toMap( { 'foo': 1, 'bar': 2 } );\n *\t\tmap = toMap( [ [ 'foo', 1 ], [ 'bar', 2 ] ] );\n *\t\tmap = toMap( anotherMap );\n *\n * @param {Object|Iterable} data Object or iterable to transform.\n * @returns {Map} Map created from data.\n */\nexport default function toMap( data ) {\n\tif ( isPlainObject( data ) ) {\n\t\treturn objectToMap( data );\n\t} else {\n\t\treturn new Map( data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/node\n */\n\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n/**\n * Model node. Most basic structure of model tree.\n *\n * This is an abstract class that is a base for other classes representing different nodes in model.\n *\n * **Note:** If a node is detached from the model tree, you can manipulate it using it's API.\n * However, it is **very important** that nodes already attached to model tree should be only changed through\n * {@link module:engine/model/writer~Writer Writer API}.\n *\n * Changes done by `Node` methods, like {@link module:engine/model/element~Element#_insertChild _insertChild} or\n * {@link module:engine/model/node~Node#_setAttribute _setAttribute}\n * do not generate {@link module:engine/model/operation/operation~Operation operations}\n * which are essential for correct editor work if you modify nodes in {@link module:engine/model/document~Document document} root.\n *\n * The flow of working on `Node` (and classes that inherits from it) is as such:\n * 1. You can create a `Node` instance, modify it using it's API.\n * 2. Add `Node` to the model using `Batch` API.\n * 3. Change `Node` that was already added to the model using `Batch` API.\n *\n * Similarly, you cannot use `Batch` API on a node that has not been added to the model tree, with the exception\n * of {@link module:engine/model/writer~Writer#insert inserting} that node to the model tree.\n *\n * Be aware that using {@link module:engine/model/writer~Writer#remove remove from Batch API} does not allow to use `Node` API because\n * the information about `Node` is still kept in model document.\n *\n * In case of {@link module:engine/model/element~Element element node}, adding and removing children also counts as changing a node and\n * follows same rules.\n */\nexport default class Node {\n\t/**\n\t * Creates a model node.\n\t *\n\t * This is an abstract class, so this constructor should not be used directly.\n\t *\n\t * @abstract\n\t * @param {Object} [attrs] Node's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\tconstructor( attrs ) {\n\t\t/**\n\t\t * Parent of this node. It could be {@link module:engine/model/element~Element}\n\t\t * or {@link module:engine/model/documentfragment~DocumentFragment}.\n\t\t * Equals to `null` if the node has no parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\n\t\t/**\n\t\t * Attributes set on this node.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/model/node~Node#_attrs\n\t\t */\n\t\tthis._attrs = toMap( attrs );\n\t}\n\n\t/**\n\t * Index of this node in it's parent or `null` if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that model tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) === null ) {\n\t\t\tthrow new CKEditorError( 'model-node-not-found-in-parent: The node\\'s parent does not contain this node.' );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Offset at which this node starts in it's parent. It is equal to the sum of {@link #offsetSize offsetSize}\n\t * of all it's previous siblings. Equals to `null` if node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that model tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|Null}\n\t */\n\tget startOffset() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tif ( ( pos = this.parent.getChildStartOffset( this ) ) === null ) {\n\t\t\tthrow new CKEditorError( 'model-node-not-found-in-parent: The node\\'s parent does not contain this node.' );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Offset size of this node. Represents how much \"offset space\" is occupied by the node in it's parent.\n\t * It is important for {@link module:engine/model/position~Position position}. When node has `offsetSize` greater than `1`, position\n\t * can be placed between that node start and end. `offsetSize` greater than `1` is for nodes that represents more\n\t * than one entity, i.e. {@link module:engine/model/text~Text text node}.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn 1;\n\t}\n\n\t/**\n\t * Offset at which this node ends in it's parent. It is equal to the sum of this node's\n\t * {@link module:engine/model/node~Node#startOffset start offset} and {@link #offsetSize offset size}.\n\t * Equals to `null` if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget endOffset() {\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.startOffset + this.offsetSize;\n\t}\n\n\t/**\n\t * Node's next sibling or `null` if the node is a last child of it's parent or if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling or `null` if the node is a first child of it's parent or if the node has no parent.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * The top-most ancestor of the node. If node has no parent it is the root itself. If the node is a part\n\t * of {@link module:engine/model/documentfragment~DocumentFragment}, it's `root` is equal to that `DocumentFragment`.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * {@link module:engine/model/document~Document Document} that owns this node or `null` if the node has no parent or is inside\n\t * a {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/document~Document|null}\n\t */\n\tget document() {\n\t\t// This is a top element of a sub-tree.\n\t\tif ( this.root == this ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Root may be `DocumentFragment` which does not have document property.\n\t\treturn this.root.document || null;\n\t}\n\n\t/**\n\t * Gets path to the node. The path is an array containing starting offsets of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/model/node~Node#root root}, down to this node's starting offset. The path can be used to\n\t * create {@link module:engine/model/position~Position Position} instance.\n\t *\n\t *\t\tconst abc = new Text( 'abc' );\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst h1 = new Element( 'h1', null, new Text( 'header' ) );\n\t *\t\tconst p = new Element( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = new Element( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.<Number>} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.startOffset );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/model/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/model/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/model/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/model/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/model/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Checks if the node has an attribute with given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on node, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on node.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._attrs.entries();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._attrs.keys();\n\t}\n\n\t/**\n\t * Converts `Node` to plain object and returns it.\n\t *\n\t * @returns {Object} `Node` converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = {};\n\n\t\tif ( this._attrs.size ) {\n\t\t\tjson.attributes = [ ...this._attrs ];\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a copy of this node, that is a node with exactly same attributes, and returns it.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/node~Node} Node with same attributes as this node.\n\t */\n\t_clone() {\n\t\treturn new Node( this._attrs );\n\t}\n\n\t/**\n\t * Removes this node from it's parent.\n\t *\n\t * @see module:engine/model/writer~Writer#remove\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * Sets attribute on the node. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * @see module:engine/model/writer~Writer#setAttribute\n\t * @protected\n\t * @param {String} key Key of attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\t_setAttribute( key, value ) {\n\t\tthis._attrs.set( key, value );\n\t}\n\n\t/**\n\t * Removes all attributes from the node and sets given attributes.\n\t *\n\t * @see module:engine/model/writer~Writer#setAttributes\n\t * @protected\n\t * @param {Object} [attrs] Attributes to set. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\t_setAttributesTo( attrs ) {\n\t\tthis._attrs = toMap( attrs );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the node.\n\t *\n\t * @see module:engine/model/writer~Writer#removeAttribute\n\t * @protected\n\t * @param {String} key Key of attribute to remove.\n\t * @returns {Boolean} `true` if the attribute was set on the element, `false` otherwise.\n\t */\n\t_removeAttribute( key ) {\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Removes all attributes from the node.\n\t *\n\t * @see module:engine/model/writer~Writer#clearAttributes\n\t * @protected\n\t */\n\t_clearAttributes() {\n\t\tthis._attrs.clear();\n\t}\n\n\t/**\n\t * Checks whether given model tree object is of given type.\n\t *\n\t * This method is useful when processing model tree objects that are of unknown type. For example, a function\n\t * may return {@link module:engine/model/documentfragment~DocumentFragment} or {@link module:engine/model/node~Node}\n\t * that can be either text node or element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tobj.is( 'node' ); // true for any node, false for document fragment and text fragment\n\t *\t\tobj.is( 'documentFragment' ); // true for document fragment, false for any node\n\t *\t\tobj.is( 'element' ); // true for any element, false for text node or document fragment\n\t *\t\tobj.is( 'element', 'paragraph' ); // true only for element which name is 'paragraph'\n\t *\t\tobj.is( 'paragraph' ); // shortcut for obj.is( 'element', 'paragraph' )\n\t *\t\tobj.is( 'text' ); // true for text node, false for element and document fragment\n\t *\t\tobj.is( 'textProxy' ); // true for text proxy object\n\t *\n\t * @method #is\n\t * @param {'element'|'rootElement'|'text'|'textProxy'|'documentFragment'} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'node';\n\t}\n}\n\n/**\n * The node's parent does not contain this node.\n *\n * This error may be thrown from corrupted trees.\n *\n * @error model-node-not-found-in-parent\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/text\n */\n\nimport Node from './node';\n\n/**\n * Model text node. Type of {@link module:engine/model/node~Node node} that contains {@link module:engine/model/text~Text#data text data}.\n *\n * **Important:** see {@link module:engine/model/node~Node} to read about restrictions using `Text` and `Node` API.\n *\n * **Note:** keep in mind that `Text` instances might indirectly got removed from model tree when model is changed.\n * This happens when {@link module:engine/model/writer~Writer model writer} is used to change model and the text node is merged with\n * another text node. Then, both text nodes are removed and a new text node is inserted into the model. Because of\n * this behavior, keeping references to `Text` is not recommended. Instead, consider creating\n * {@link module:engine/model/liveposition~LivePosition live position} placed before the text node.\n *\n * @extends {module:engine/model/node~Node}\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a text node.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createText} method instead.\n\t *\n\t * @protected\n\t * @param {String} data Node's text.\n\t * @param {Object} [attrs] Node's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t */\n\tconstructor( data, attrs ) {\n\t\tsuper( attrs );\n\n\t\t/**\n\t\t * Text data contained in this text node.\n\t\t *\n\t\t * @protected\n\t\t * @type {String}\n\t\t */\n\t\tthis._data = data || '';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Returns a text data contained in the node.\n\t *\n\t * @returns {String}\n\t */\n\tget data() {\n\t\treturn this._data;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type ) {\n\t\treturn type == 'text' || super.is( type );\n\t}\n\n\t/**\n\t * Converts `Text` instance to plain object and returns it.\n\t *\n\t * @returns {Object} `Text` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.data = this.data;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a copy of this text node and returns it. Created text node has same text data and attributes as original text node.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/text~Text} `Text` instance created using given plain object.\n\t */\n\t_clone() {\n\t\treturn new Text( this.data, this.getAttributes() );\n\t}\n\n\t/**\n\t * Creates a `Text` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Text`.\n\t * @returns {module:engine/model/text~Text} `Text` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\treturn new Text( json.data, json.attributes );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * `TextProxy` represents a part of {@link module:engine/model/text~Text text node}.\n *\n * Since {@link module:engine/model/position~Position positions} can be placed between characters of a text node,\n * {@link module:engine/model/range~Range ranges} may contain only parts of text nodes. When {@link module:engine/model/range~Range#getItems\n * getting items}\n * contained in such range, we need to represent a part of that text node, since returning the whole text node would be incorrect.\n * `TextProxy` solves this issue.\n *\n * `TextProxy` has an API similar to {@link module:engine/model/text~Text Text} and allows to do most of the common tasks performed\n * on model nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/model/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is not an instance of {@link module:engine/model/node~Node node}. Keep this in mind when using it as a\n * parameter of methods.\n *\n * **Note:** `TextProxy` is a readonly interface. If you want to perform changes on model data represented by a `TextProxy`\n * use {@link module:engine/model/writer~Writer model writer API}.\n *\n * **Note:** `TextProxy` instances are created on the fly, basing on the current state of model. Because of this, it is\n * highly unrecommended to store references to `TextProxy` instances. `TextProxy` instances are not refreshed when\n * model changes, so they might get invalidated. Instead, consider creating {@link module:engine/model/liveposition~LivePosition live\n * position}.\n *\n * `TextProxy` instances are created by {@link module:engine/model/treewalker~TreeWalker model tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/model/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/model/textproxy~TextProxy#textNode text node} from which the text proxy\n\t * starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Text node which part is represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/text~Text}\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.offsetSize ) {\n\t\t\t/**\n\t\t\t * Given `offsetInText` value is incorrect.\n\t\t\t *\n\t\t\t * @error model-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.' );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.offsetSize ) {\n\t\t\t/**\n\t\t\t * Given `length` value is incorrect.\n\t\t\t *\n\t\t\t * @error model-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-textproxy-wrong-length: Given length value is incorrect.' );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in {@link module:engine/model/textproxy~TextProxy#textNode text node} from which the text proxy starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * Offset at which this text proxy starts in it's parent.\n\t *\n\t * @see module:engine/model/node~Node#startOffset\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget startOffset() {\n\t\treturn this.textNode.startOffset !== null ? this.textNode.startOffset + this.offsetInText : null;\n\t}\n\n\t/**\n\t * Offset size of this text proxy. Equal to the number of characters represented by the text proxy.\n\t *\n\t * @see module:engine/model/node~Node#offsetSize\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Offset at which this text proxy ends in it's parent.\n\t *\n\t * @see module:engine/model/node~Node#endOffset\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget endOffset() {\n\t\treturn this.startOffset !== null ? this.startOffset + this.offsetSize : null;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/model/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/model/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/model/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.offsetSize !== this.textNode.offsetSize;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * {@link module:engine/model/document~Document Document} that owns text node represented by this text proxy or `null` if the text node\n\t * has no parent or is inside a {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this.textNode.document;\n\t}\n\n\t/**\n\t * Checks whether given model tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/model/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'textProxy';\n\t}\n\n\t/**\n\t * Gets path to this text proxy.\n\t *\n\t * @see module:engine/model/node~Node#getPath\n\t * @returns {Array.<Number>}\n\t */\n\tgetPath() {\n\t\tconst path = this.textNode.getPath();\n\n\t\tif ( path.length > 0 ) {\n\t\t\tpath[ path.length - 1 ] += this.offsetInText;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this text proxy will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Checks if this text proxy has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on text proxy, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this.textNode.hasAttribute( key );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on text proxy.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this.textNode.getAttribute( key );\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attributes. Attributes are returned as arrays containing two\n\t * items. First one is attribute key and second is attribute value.\n\t *\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this.textNode.getAttributes();\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this node's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this.textNode.getAttributeKeys();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/nodelist\n */\n\nimport Node from './node';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Provides an interface to operate on a list of {@link module:engine/model/node~Node nodes}. `NodeList` is used internally\n * in classes like {@link module:engine/model/element~Element Element}\n * or {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment}.\n */\nexport default class NodeList {\n\t/**\n\t * Creates an empty node list.\n\t *\n\t * @protected\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes contained in this node list.\n\t */\n\tconstructor( nodes ) {\n\t\t/**\n\t\t * Nodes contained in this node list.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<module:engine/model/node~Node>}\n\t\t */\n\t\tthis._nodes = [];\n\n\t\tif ( nodes ) {\n\t\t\tthis._insertNodes( 0, nodes );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all nodes contained inside this node list.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._nodes[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of nodes contained inside this node list.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget length() {\n\t\treturn this._nodes.length;\n\t}\n\n\t/**\n\t * Sum of {@link module:engine/model/node~Node#offsetSize offset sizes} of all nodes contained inside this node list.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._nodes.reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\t}\n\n\t/**\n\t * Gets the node at the given index. Returns `null` if incorrect index was passed.\n\t *\n\t * @param {Number} index Index of node.\n\t * @returns {module:engine/model/node~Node|null} Node at given index.\n\t */\n\tgetNode( index ) {\n\t\treturn this._nodes[ index ] || null;\n\t}\n\n\t/**\n\t * Returns an index of the given node. Returns `null` if given node is not inside this node list.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's index.\n\t */\n\tgetNodeIndex( node ) {\n\t\tconst index = this._nodes.indexOf( node );\n\n\t\treturn index == -1 ? null : index;\n\t}\n\n\t/**\n\t * Returns the starting offset of given node. Starting offset is equal to the sum of\n\t * {module:engine/model/node~Node#offsetSize offset sizes} of all nodes that are before this node in this node list.\n\t *\n\t * @param {module:engine/model/node~Node} node Node to look for.\n\t * @returns {Number|null} Node's starting offset.\n\t */\n\tgetNodeStartOffset( node ) {\n\t\tconst index = this.getNodeIndex( node );\n\n\t\treturn index === null ? null : this._nodes.slice( 0, index ).reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\t}\n\n\t/**\n\t * Converts index to offset in node list.\n\t *\n\t * Returns starting offset of a node that is at given index. Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * `model-nodelist-index-out-of-bounds` if given index is less than `0` or more than {@link #length}.\n\t *\n\t * @param {Number} index Node's index.\n\t * @returns {Number} Node's starting offset.\n\t */\n\tindexToOffset( index ) {\n\t\tif ( index == this._nodes.length ) {\n\t\t\treturn this.maxOffset;\n\t\t}\n\n\t\tconst node = this._nodes[ index ];\n\n\t\tif ( !node ) {\n\t\t\t/**\n\t\t\t * Given index cannot be found in the node list.\n\t\t\t *\n\t\t\t * @error nodelist-index-out-of-bounds\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-nodelist-index-out-of-bounds: Given index cannot be found in the node list.' );\n\t\t}\n\n\t\treturn this.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Converts offset in node list to index.\n\t *\n\t * Returns index of a node that occupies given offset. Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError}\n\t * `model-nodelist-offset-out-of-bounds` if given offset is less than `0` or more than {@link #maxOffset}.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number} Index of a node that occupies given offset.\n\t */\n\toffsetToIndex( offset ) {\n\t\tlet totalOffset = 0;\n\n\t\tfor ( const node of this._nodes ) {\n\t\t\tif ( offset >= totalOffset && offset < totalOffset + node.offsetSize ) {\n\t\t\t\treturn this.getNodeIndex( node );\n\t\t\t}\n\n\t\t\ttotalOffset += node.offsetSize;\n\t\t}\n\n\t\tif ( totalOffset != offset ) {\n\t\t\t/**\n\t\t\t * Given offset cannot be found in the node list.\n\t\t\t *\n\t\t\t * @error model-nodelist-offset-out-of-bounds\n\t\t\t * @param {Number} offset\n\t\t\t * @param {module:engine/model/nodelist~NodeList} nodeList Stringified node list.\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-nodelist-offset-out-of-bounds: Given offset cannot be found in the node list.', {\n\t\t\t\toffset,\n\t\t\t\tnodeList: this\n\t\t\t} );\n\t\t}\n\n\t\treturn this.length;\n\t}\n\n\t/**\n\t * Inserts given nodes at given index.\n\t *\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to be inserted.\n\t */\n\t_insertNodes( index, nodes ) {\n\t\t// Validation.\n\t\tfor ( const node of nodes ) {\n\t\t\tif ( !( node instanceof Node ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to insert an object which is not a Node instance.\n\t\t\t\t *\n\t\t\t\t * @error nodelist-insertNodes-not-node\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'model-nodelist-insertNodes-not-node: Trying to insert an object which is not a Node instance.' );\n\t\t\t}\n\t\t}\n\n\t\tthis._nodes.splice( index, 0, ...nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index.\n\t *\n\t * @protected\n\t * @param {Number} indexStart Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeNodes( indexStart, howMany = 1 ) {\n\t\treturn this._nodes.splice( indexStart, howMany );\n\t}\n\n\t/**\n\t * Converts `NodeList` instance to an array containing nodes that were inserted in the node list. Nodes\n\t * are also converted to their plain object representation.\n\t *\n\t * @returns {Array.<module:engine/model/node~Node>} `NodeList` instance converted to `Array`.\n\t */\n\ttoJSON() {\n\t\treturn this._nodes.map( node => node.toJSON() );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/element\n */\n\nimport Node from './node';\nimport NodeList from './nodelist';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n/**\n * Model element. Type of {@link module:engine/model/node~Node node} that has a {@link module:engine/model/element~Element#name name} and\n * {@link module:engine/model/element~Element#getChildren child nodes}.\n *\n * **Important**: see {@link module:engine/model/node~Node} to read about restrictions using `Element` and `Node` API.\n *\n * @extends {module:engine/model/node~Node}\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a model element.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createElement} method instead.\n\t *\n\t * @protected\n\t * @param {String} name Element's name.\n\t * @param {Object} [attrs] Element's attributes. See {@link module:utils/tomap~toMap} for a list of accepted values.\n\t * @param {module:engine/model/node~Node|Iterable.<module:engine/model/node~Node>} [children]\n\t * One or more nodes to be inserted as children of created element.\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( attrs );\n\n\t\t/**\n\t\t * Element name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/model/element~Element#name\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * List of children nodes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/element~Element#_children\n\t\t */\n\t\tthis._children = new NodeList();\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Number of this element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Sum of {module:engine/model/node~Node#offsetSize offset sizes} of all of this element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._children.maxOffset;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Checks whether given model tree object is of given type.\n\t *\n\t *\t\tobj.name; // 'listItem'\n\t *\t\tobj instanceof Element; // true\n\t *\n\t *\t\tobj.is( 'element' ); // true\n\t *\t\tobj.is( 'listItem' ); // true\n\t *\t\tobj.is( 'element', 'listItem' ); // true\n\t *\t\tobj.is( 'text' ); // false\n\t *\t\tobj.is( 'element', 'image' ); // false\n\t *\n\t * Read more in {@link module:engine/model/node~Node#is}.\n\t *\n\t * @param {String} type Type to check when `name` parameter is present.\n\t * Otherwise, it acts like the `name` parameter.\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'element' || type == this.name || super.is( type );\n\t\t} else {\n\t\t\treturn type == 'element' && name == this.name;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/model/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children.getNode( index );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all of this element's children.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an index of the given child node. Returns `null` if given node is not a child of this element.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number} Child node's index in this element.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.getNodeIndex( node );\n\t}\n\n\t/**\n\t * Returns the starting offset of given child. Starting offset is equal to the sum of\n\t * {module:engine/model/node~Node#offsetSize offset sizes} of all node's siblings that are before it. Returns `null` if\n\t * given node is not a child of this element.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number} Child node's starting offset.\n\t */\n\tgetChildStartOffset( node ) {\n\t\treturn this._children.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Returns index of a node that occupies given offset. If given offset is too low, returns `0`. If given offset is\n\t * too high, returns {@link module:engine/model/element~Element#getChildIndex index after last child}.\n\t *\n\t *\t\tconst textNode = new Text( 'foo' );\n\t *\t\tconst pElement = new Element( 'p' );\n\t *\t\tconst divElement = new Element( [ textNode, pElement ] );\n\t *\t\tdivElement.offsetToIndex( -1 ); // Returns 0, because offset is too low.\n\t *\t\tdivElement.offsetToIndex( 0 ); // Returns 0, because offset 0 is taken by `textNode` which is at index 0.\n\t *\t\tdivElement.offsetToIndex( 1 ); // Returns 0, because `textNode` has `offsetSize` equal to 3, so it occupies offset 1 too.\n\t *\t\tdivElement.offsetToIndex( 2 ); // Returns 0.\n\t *\t\tdivElement.offsetToIndex( 3 ); // Returns 1.\n\t *\t\tdivElement.offsetToIndex( 4 ); // Returns 2. There are no nodes at offset 4, so last available index is returned.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number}\n\t */\n\toffsetToIndex( offset ) {\n\t\treturn this._children.offsetToIndex( offset );\n\t}\n\n\t/**\n\t * Returns a descendant node by its path relative to this element.\n\t *\n\t *\t\t// <this>a<b>c</b></this>\n\t *\t\tthis.getNodeByPath( [ 0 ] );     // -> \"a\"\n\t *\t\tthis.getNodeByPath( [ 1 ] );     // -> <b>\n\t *\t\tthis.getNodeByPath( [ 1, 0 ] );  // -> \"c\"\n\t *\n\t * @param {Array.<Number>} relativePath Path of the node to find, relative to this element.\n\t * @returns {module:engine/model/node~Node}\n\t */\n\tgetNodeByPath( relativePath ) {\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\tfor ( const index of relativePath ) {\n\t\t\tnode = node.getChild( node.offsetToIndex( index ) );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Converts `Element` instance to plain object and returns it. Takes care of converting all of this element's children.\n\t *\n\t * @returns {Object} `Element` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tjson.name = this.name;\n\n\t\tif ( this._children.length > 0 ) {\n\t\t\tjson.children = [];\n\n\t\t\tfor ( const node of this._children ) {\n\t\t\t\tjson.children.push( node.toJSON() );\n\t\t\t}\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a copy of this element and returns it. Created element has the same name and attributes as the original element.\n\t * If clone is deep, the original element's children are also cloned. If not, then empty element is removed.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any child.\n\t */\n\t_clone( deep = false ) {\n\t\tconst children = deep ? Array.from( this._children ).map( node => node._clone( true ) ) : null;\n\n\t\treturn new Element( this.name, this.getAttributes(), children );\n\t}\n\n\t/**\n\t * {@link module:engine/model/element~Element#_insertChild Inserts} one or more nodes at the end of this element.\n\t *\n\t * @see module:engine/model/writer~Writer#append\n\t * @protected\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} nodes Nodes to be inserted.\n\t */\n\t_appendChild( nodes ) {\n\t\tthis._insertChild( this.childCount, nodes );\n\t}\n\n\t/**\n\t * Inserts one or more nodes at the given index and sets {@link module:engine/model/node~Node#parent parent} of these nodes\n\t * to this element.\n\t *\n\t * @see module:engine/model/writer~Writer#insert\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_insertChild( index, items ) {\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t}\n\n\t\tthis._children._insertNodes( index, nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index and sets\n\t * {@link module:engine/model/node~Node#parent parent} of these nodes to `null`.\n\t *\n\t * @see module:engine/model/writer~Writer#remove\n\t * @protected\n\t * @param {Number} index Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tconst nodes = this._children._removeNodes( index, howMany );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tnode.parent = null;\n\t\t}\n\n\t\treturn nodes;\n\t}\n\n\t/**\n\t * Creates an `Element` instance from given plain object (i.e. parsed JSON string).\n\t * Converts `Element` children to proper nodes.\n\t *\n\t * @param {Object} json Plain object to be converted to `Element`.\n\t * @returns {module:engine/model/element~Element} `Element` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\tlet children = null;\n\n\t\tif ( json.children ) {\n\t\t\tchildren = [];\n\n\t\t\tfor ( const child of json.children ) {\n\t\t\t\tif ( child.name ) {\n\t\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t\t} else {\n\t\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn new Element( json.name, json.attributes, children );\n\t}\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/model/item~Item|Iterable.<String|module:engine/model/item~Item>}\n// @returns {Iterable.<module:engine/model/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data, node.getAttributes() );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/treewalker\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Element from './element';\nimport Position from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} [options={}] Object with configuration.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {module:engine/model/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/model/position~Position} [options.startPosition] Starting position.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all consecutive characters with the same attributes\n\t * should be returned one by one as multiple {@link module:engine/model/textproxy~TextProxy} (`true`) objects or as one\n\t * {@link module:engine/model/textproxy~TextProxy} (`false`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/model/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position of a `TreeWalker` have been defined.\n\t\t\t *\n\t\t\t * @error model-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.' );\n\t\t}\n\n\t\tconst direction = options.direction || 'forward';\n\n\t\tif ( direction != 'forward' && direction != 'backward' ) {\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.',\n\t\t\t\t{ direction }\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/model/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = direction;\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range} module:engine/model/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. This is always static position, even if the initial position was a\n\t\t * {@link module:engine/model/liveposition~LivePosition live position}. If start position is not defined then position depends\n\t\t * on {@link #direction}. If direction is `'forward'` position starts form the beginning, when direction\n\t\t * is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position} module:engine/model/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = Position.createFromPosition( options.startPosition );\n\t\t} else {\n\t\t\tthis.position = Position.createFromPosition( this.boundaries[ this.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t/**\n\t\t * Flag indicating whether all consecutive characters with the same attributes should be\n\t\t * returned as one {@link module:engine/model/textproxy~TextProxy} (`true`) or one by one (`false`).\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If the option is true walker will not\n\t\t * return a parent node of the start position. If this option is `true` each {@link module:engine/model/element~Element} will\n\t\t * be returned once, while if the option is `false` they might be returned twice:\n\t\t * for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/model/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element} module:engine/model/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element} module:engine/model/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\n\t\t/**\n\t\t * Parent of the most recently visited node. Cached for optimization purposes.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t\t * module:engine/model/treewalker~TreeWalker#_visitedParent\n\t\t */\n\t\tthis._visitedParent = this.position.parent;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:engine/model/treewalker~TreeWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); // <paragraph>[]foo</paragraph> -> <paragraph>foo[]</paragraph>\n\t * \t\twalker.skip( () => true ); // Move the position to the end: <paragraph>[]foo</paragraph> -> <paragraph>foo</paragraph>[]\n\t * \t\twalker.skip( () => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/model/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition, prevVisitedParent;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\t\t\tprevVisitedParent = this._visitedParent;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t\tthis._visitedParent = prevVisitedParent;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} Next tree walker's value.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in model. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tconst previousPosition = this.position;\n\t\tconst position = Position.createFromPosition( this.position );\n\t\tconst parent = this._visitedParent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.maxOffset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\tconst node = position.textNode ? position.textNode : position.nodeAfter;\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\t// Manual operations on path internals for optimization purposes. Here and in the rest of the method.\n\t\t\t\tposition.path.push( 0 );\n\t\t\t\tthis._visitedParent = node;\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tlet charactersCount;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tcharactersCount = 1;\n\t\t\t} else {\n\t\t\t\tlet offset = node.endOffset;\n\n\t\t\t\tif ( this._boundaryEndParent == parent && this.boundaries.end.offset < offset ) {\n\t\t\t\t\toffset = this.boundaries.end.offset;\n\t\t\t\t}\n\n\t\t\t\tcharactersCount = offset - position.offset;\n\t\t\t}\n\n\t\t\tconst offsetInTextNode = position.offset - node.startOffset;\n\t\t\tconst item = new TextProxy( node, offsetInTextNode, charactersCount );\n\n\t\t\tposition.offset += charactersCount;\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition.path.pop();\n\t\t\tposition.offset++;\n\t\t\tthis.position = position;\n\t\t\tthis._visitedParent = parent.parent;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in model. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/model/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tconst previousPosition = this.position;\n\t\tconst position = Position.createFromPosition( this.position );\n\t\tconst parent = this._visitedParent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before current position\n\t\tconst node = position.textNode ? position.textNode : position.nodeBefore;\n\n\t\tif ( node instanceof Element ) {\n\t\t\tposition.offset--;\n\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition.path.push( node.maxOffset );\n\t\t\t\tthis.position = position;\n\t\t\t\tthis._visitedParent = node;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tlet charactersCount;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tcharactersCount = 1;\n\t\t\t} else {\n\t\t\t\tlet offset = node.startOffset;\n\n\t\t\t\tif ( this._boundaryStartParent == parent && this.boundaries.start.offset > offset ) {\n\t\t\t\t\toffset = this.boundaries.start.offset;\n\t\t\t\t}\n\n\t\t\t\tcharactersCount = position.offset - offset;\n\t\t\t}\n\n\t\t\tconst offsetInTextNode = position.offset - node.startOffset;\n\t\t\tconst item = new TextProxy( node, offsetInTextNode - charactersCount, charactersCount );\n\n\t\t\tposition.offset -= charactersCount;\n\t\t\tthis.position = position;\n\n\t\t\treturn formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition.path.pop();\n\t\t\tthis.position = position;\n\t\t\tthis._visitedParent = parent.parent;\n\n\t\t\treturn formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n}\n\nfunction formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\treturn {\n\t\tdone: false,\n\t\tvalue: {\n\t\t\ttype,\n\t\t\titem,\n\t\t\tpreviousPosition,\n\t\t\tnextPosition,\n\t\t\tlength\n\t\t}\n\t};\n}\n\n/**\n * Type of the step made by {@link module:engine/model/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end of node,\n * `'character'` if walker traversed over a character, or `'text'` if walker traversed over multiple characters (available in\n * character merging mode, see {@link module:engine/model/treewalker~TreeWalker#constructor}).\n *\n * @typedef {'elementStart'|'elementEnd'|'character'|'text'} module:engine/model/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/model/treewalker~TreeWalker} when traversing tree model.\n *\n * @typedef {Object} module:engine/model/treewalker~TreeWalkerValue\n * @property {module:engine/model/treewalker~TreeWalkerValueType} type\n * @property {module:engine/model/item~Item} item Item between old and new positions of {@link module:engine/model/treewalker~TreeWalker}.\n * @property {module:engine/model/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item. Note that it is more efficient to use this position then calculate the position before\n * the node using {@link module:engine/model/position~Position.createBefore}. It is also more efficient to get the\n * position after node by shifting `previousPosition` by `length`, using {@link module:engine/model/position~Position#getShiftedBy},\n * then calculate the position using {@link module:engine/model/position~Position.createAfter}.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * @property {module:engine/model/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * @property {Number} [length] Length of the item. For `'elementStart'` and `'character'` it is 1. For `'text'` it is\n * the length of the text. For `'elementEnd'` it is undefined.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/view/treewalker~TreeWalkerDirection\n */\n","/**\n * Gets the last element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {*} Returns the last element of `array`.\n * @example\n *\n * _.last([1, 2, 3]);\n * // => 3\n */\nfunction last(array) {\n  var length = array ? array.length : 0;\n  return length ? array[length - 1] : undefined;\n}\n\nexport default last;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/position\n */\n\nimport TreeWalker from './treewalker';\nimport last from '@ckeditor/ckeditor5-utils/src/lib/lodash/last';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Text from './text';\n\n/**\n * Represents a position in the model tree.\n *\n * **Note:** Position is based on offsets, not indexes. This means that position in element containing two text nodes\n * with data `foo` and `bar`, position between them has offset `3`, not `1`.\n * See {@link module:engine/model/position~Position#path} for more.\n *\n * Since position in a model is represented by a {@link module:engine/model/position~Position#root position root} and\n * {@link module:engine/model/position~Position#path position path} it is possible to create positions placed in non-existing elements.\n * This requirement is important for {@link module:engine/model/operation/transform~transform operational transformation}.\n *\n * Also, {@link module:engine/model/operation/operation~Operation operations}\n * kept in {@link module:engine/model/document~Document#history document history}\n * are storing positions (and ranges) which were correct when those operations were applied, but may not be correct\n * after document got changed.\n *\n * When changes are applied to model, it may also happen that {@link module:engine/model/position~Position#parent position parent}\n * will change even if position path has not changed. Keep in mind, that if a position leads to non-existing element,\n * {@link module:engine/model/position~Position#parent} and some other properties and methods will throw errors.\n *\n * In most cases, position with wrong path is caused by an error in code, but it is sometimes needed, as described above.\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} root Root of the position.\n\t * @param {Array.<Number>} path Position path. See {@link module:engine/model/position~Position#path}.\n\t */\n\tconstructor( root, path ) {\n\t\tif ( !root.is( 'element' ) && !root.is( 'documentFragment' ) ) {\n\t\t\t/**\n\t\t\t * Position root is invalid.\n\t\t\t *\n\t\t\t * Positions can only be anchored in elements or document fragments.\n\t\t\t *\n\t\t\t * @error model-position-root-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-position-root-invalid: Position root invalid.' );\n\t\t}\n\n\t\tif ( !( path instanceof Array ) || path.length === 0 ) {\n\t\t\t/**\n\t\t\t * Position path must be an array with at least one item.\n\t\t\t *\n\t\t\t * @error model-position-path-incorrect\n\t\t\t * @param path\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-position-path-incorrect: Position path must be an array with at least one item.', { path } );\n\t\t}\n\n\t\t// Normalize the root and path (if element was passed).\n\t\tpath = root.getPath().concat( path );\n\t\troot = root.root;\n\n\t\t/**\n\t\t * Root of the position path.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t\t * module:engine/model/position~Position#root\n\t\t */\n\t\tthis.root = root;\n\n\t\t/**\n\t\t * Position of the node in the tree. **Path contains offsets, not indexes.**\n\t\t *\n\t\t * Position can be placed before, after or in a {@link module:engine/model/node~Node node} if that node has\n\t\t * {@link module:engine/model/node~Node#offsetSize} greater than `1`. Items in position path are\n\t\t * {@link module:engine/model/node~Node#startOffset starting offsets} of position ancestors, starting from direct root children,\n\t\t * down to the position offset in it's parent.\n\t\t *\n\t\t *\t\t ROOT\n\t\t *\t\t  |- P            before: [ 0 ]         after: [ 1 ]\n\t\t *\t\t  |- UL           before: [ 1 ]         after: [ 2 ]\n\t\t *\t\t     |- LI        before: [ 1, 0 ]      after: [ 1, 1 ]\n\t\t *\t\t     |  |- foo    before: [ 1, 0, 0 ]   after: [ 1, 0, 3 ]\n\t\t *\t\t     |- LI        before: [ 1, 1 ]      after: [ 1, 2 ]\n\t\t *\t\t        |- bar    before: [ 1, 1, 0 ]   after: [ 1, 1, 3 ]\n\t\t *\n\t\t * `foo` and `bar` are representing {@link module:engine/model/text~Text text nodes}. Since text nodes has offset size\n\t\t * greater than `1` you can place position offset between their start and end:\n\t\t *\n\t\t *\t\t ROOT\n\t\t *\t\t  |- P\n\t\t *\t\t  |- UL\n\t\t *\t\t     |- LI\n\t\t *\t\t     |  |- f^o|o  ^ has path: [ 1, 0, 1 ]   | has path: [ 1, 0, 2 ]\n\t\t *\t\t     |- LI\n\t\t *\t\t        |- b^a|r  ^ has path: [ 1, 1, 1 ]   | has path: [ 1, 1, 2 ]\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<Number>} module:engine/model/position~Position#path\n\t\t */\n\t\tthis.path = path;\n\t}\n\n\t/**\n\t * Offset at which this position is located in its {@link module:engine/model/position~Position#parent parent}. It is equal\n\t * to the last item in position {@link module:engine/model/position~Position#path path}.\n\t *\n\t * @type {Number}\n\t */\n\tget offset() {\n\t\treturn last( this.path );\n\t}\n\n\t/**\n\t * @param {Number} newOffset\n\t */\n\tset offset( newOffset ) {\n\t\tthis.path[ this.path.length - 1 ] = newOffset;\n\t}\n\n\t/**\n\t * Parent element of this position.\n\t *\n\t * Keep in mind that `parent` value is calculated when the property is accessed.\n\t * If {@link module:engine/model/position~Position#path position path}\n\t * leads to a non-existing element, `parent` property will throw error.\n\t *\n\t * Also it is a good idea to cache `parent` property if it is used frequently in an algorithm (i.e. in a long loop).\n\t *\n\t * @readonly\n\t * @type {module:engine/model/element~Element}\n\t */\n\tget parent() {\n\t\tlet parent = this.root;\n\n\t\tfor ( let i = 0; i < this.path.length - 1; i++ ) {\n\t\t\tparent = parent.getChild( parent.offsetToIndex( this.path[ i ] ) );\n\t\t}\n\n\t\treturn parent;\n\t}\n\n\t/**\n\t * Position {@link module:engine/model/position~Position#offset offset} converted to an index in position's parent node. It is\n\t * equal to the {@link module:engine/model/node~Node#index index} of a node after this position. If position is placed\n\t * in text node, position index is equal to the index of that text node.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget index() {\n\t\treturn this.parent.offsetToIndex( this.offset );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/model/text~Text text node} instance in which this position is placed or `null` if this\n\t * position is not in a text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/text~Text|null}\n\t */\n\tget textNode() {\n\t\tconst node = this.parent.getChild( this.index );\n\n\t\treturn ( node instanceof Text && node.startOffset < this.offset ) ? node : null;\n\t}\n\n\t/**\n\t * Node directly after this position or `null` if this position is in text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\treturn this.textNode === null ? this.parent.getChild( this.index ) : null;\n\t}\n\n\t/**\n\t * Node directly before this position or `null` if this position is in text node.\n\t *\n\t * @readonly\n\t * @type {Node}\n\t */\n\tget nodeBefore() {\n\t\treturn this.textNode === null ? this.parent.getChild( this.index - 1 ) : null;\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/model/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/model/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\treturn this.offset == this.parent.maxOffset;\n\t}\n\n\t/**\n\t * Checks whether this position is before or after given position.\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/model/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root != otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tconst result = compareArrays( this.path, otherPosition.path );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'same':\n\t\t\t\treturn 'same';\n\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn this.path[ result ] < otherPosition.path[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/model/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' );\n\t * \t\t// <paragraph>[]foo</paragraph> -> <paragraph>foo[]</paragraph>\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } );\n\t * \t\t// <paragraph>foo[]</paragraph> -> <paragraph>[]foo</paragraph>\n\t *\n\t * \t\tgetLastMatchingPosition( value => false );\n\t * \t\t// Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/model/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/model/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns a path to this position's parent. Parent path is equal to position {@link module:engine/model/position~Position#path path}\n\t * but without the last item.\n\t *\n\t * This method returns the parent path even if the parent does not exists.\n\t *\n\t * @returns {Array.<Number>} Path to the parent.\n\t */\n\tgetParentPath() {\n\t\treturn this.path.slice( 0, -1 );\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and its ancestors.\n\t *\n\t * @returns {Array.<module:engine/model/item~Item>} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tif ( this.parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ this.parent ];\n\t\t} else {\n\t\t\treturn this.parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the slice of two position {@link #path paths} which is identical. The {@link #root roots}\n\t * of these two paths must be identical.\n\t *\n\t * @param {module:engine/model/position~Position} position The second position.\n\t * @returns {Array.<Number>} The common path.\n\t */\n\tgetCommonPath( position ) {\n\t\tif ( this.root != position.root ) {\n\t\t\treturn [];\n\t\t}\n\n\t\t// We find on which tree-level start and end have the lowest common ancestor\n\t\tconst cmp = compareArrays( this.path, position.path );\n\t\t// If comparison returned string it means that arrays are same.\n\t\tconst diffAt = ( typeof cmp == 'string' ) ? Math.min( this.path.length, position.path.length ) : cmp;\n\n\t\treturn this.path.slice( 0, diffAt );\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions. The {@link #root roots} of these two positions must be identical.\n\t *\n\t * @param {module:engine/model/position~Position} position The second position.\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns a new instance of `Position`, that has same {@link #parent parent} but it's offset\n\t * is shifted by `shift` value (can be a negative value).\n\t *\n\t * @param {Number} shift Offset shift. Can be a negative value.\n\t * @returns {module:engine/model/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = Position.createFromPosition( this );\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Checks whether this position is after given position.\n\t *\n\t * @see module:engine/model/position~Position#isBefore\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before given position.\n\t *\n\t * **Note:** watch out when using negation of the value returned by this method, because the negation will also\n\t * be `true` if positions are in different roots and you might not expect this. You should probably use\n\t * `a.isAfter( b ) || a.isEqual( b )` or `!a.isBefore( p ) && a.root == b.root` in most scenarios. If your\n\t * condition uses multiple `isAfter` and `isBefore` checks, build them so they do not use negated values, i.e.:\n\t *\n\t *\t\tif ( a.isBefore( b ) && c.isAfter( d ) ) {\n\t *\t\t\t// do A.\n\t *\t\t} else {\n\t *\t\t\t// do B.\n\t *\t\t}\n\t *\n\t * or, if you have only one if-branch:\n\t *\n\t *\t\tif ( !( a.isBefore( b ) && c.isAfter( d ) ) {\n\t *\t\t\t// do B.\n\t *\t\t}\n\t *\n\t * rather than:\n\t *\n\t *\t\tif ( !a.isBefore( b ) || && !c.isAfter( d ) ) {\n\t *\t\t\t// do B.\n\t *\t\t} else {\n\t *\t\t\t// do A.\n\t *\t\t}\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is equal to given position.\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'same';\n\t}\n\n\t/**\n\t * Checks whether this position is touching given position. Positions touch when there are no text nodes\n\t * or empty nodes in a range between them. Technically, those positions are not equal but in many cases\n\t * they are very similar or even indistinguishable.\n\t *\n\t * **Note:** this method traverses model document so it can be only used when range is up-to-date with model document.\n\t *\n\t * @param {module:engine/model/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions touch.\n\t */\n\tisTouching( otherPosition ) {\n\t\tlet left = null;\n\t\tlet right = null;\n\t\tconst compare = this.compareWith( otherPosition );\n\n\t\tswitch ( compare ) {\n\t\t\tcase 'same':\n\t\t\t\treturn true;\n\n\t\t\tcase 'before':\n\t\t\t\tleft = Position.createFromPosition( this );\n\t\t\t\tright = Position.createFromPosition( otherPosition );\n\t\t\t\tbreak;\n\n\t\t\tcase 'after':\n\t\t\t\tleft = Position.createFromPosition( otherPosition );\n\t\t\t\tright = Position.createFromPosition( this );\n\t\t\t\tbreak;\n\n\t\t\tdefault:\n\t\t\t\treturn false;\n\t\t}\n\n\t\t// Cached for optimization purposes.\n\t\tlet leftParent = left.parent;\n\n\t\twhile ( left.path.length + right.path.length ) {\n\t\t\tif ( left.isEqual( right ) ) {\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\tif ( left.path.length > right.path.length ) {\n\t\t\t\tif ( left.offset !== leftParent.maxOffset ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\n\t\t\t\tleft.path = left.path.slice( 0, -1 );\n\t\t\t\tleftParent = leftParent.parent;\n\t\t\t\tleft.offset++;\n\t\t\t} else {\n\t\t\t\tif ( right.offset !== 0 ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\n\t\t\t\tright.path = right.path.slice( 0, -1 );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by removing `howMany` nodes starting from `deletePosition`.\n\t * It may happen that this position is in a removed node. If that is the case, `null` is returned instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} deletePosition Position before the first removed node.\n\t * @param {Number} howMany How many nodes are removed.\n\t * @returns {module:engine/model/position~Position|null} Transformed position or `null`.\n\t */\n\t_getTransformedByDeletion( deletePosition, howMany ) {\n\t\tconst transformed = Position.createFromPosition( this );\n\n\t\t// This position can't be affected if deletion was in a different root.\n\t\tif ( this.root != deletePosition.root ) {\n\t\t\treturn transformed;\n\t\t}\n\n\t\tif ( compareArrays( deletePosition.getParentPath(), this.getParentPath() ) == 'same' ) {\n\t\t\t// If nodes are removed from the node that is pointed by this position...\n\t\t\tif ( deletePosition.offset < this.offset ) {\n\t\t\t\t// And are removed from before an offset of that position...\n\t\t\t\tif ( deletePosition.offset + howMany > this.offset ) {\n\t\t\t\t\t// Position is in removed range, it's no longer in the tree.\n\t\t\t\t\treturn null;\n\t\t\t\t} else {\n\t\t\t\t\t// Decrement the offset accordingly.\n\t\t\t\t\ttransformed.offset -= howMany;\n\t\t\t\t}\n\t\t\t}\n\t\t} else if ( compareArrays( deletePosition.getParentPath(), this.getParentPath() ) == 'prefix' ) {\n\t\t\t// If nodes are removed from a node that is on a path to this position...\n\t\t\tconst i = deletePosition.path.length - 1;\n\n\t\t\tif ( deletePosition.offset <= this.path[ i ] ) {\n\t\t\t\t// And are removed from before next node of that path...\n\t\t\t\tif ( deletePosition.offset + howMany > this.path[ i ] ) {\n\t\t\t\t\t// If the next node of that path is removed return null\n\t\t\t\t\t// because the node containing this position got removed.\n\t\t\t\t\treturn null;\n\t\t\t\t} else {\n\t\t\t\t\t// Otherwise, decrement index on that path.\n\t\t\t\t\ttransformed.path[ i ] -= howMany;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn transformed;\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by inserting `howMany` nodes at `insertPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} insertPosition Position where nodes are inserted.\n\t * @param {Number} howMany How many nodes are inserted.\n\t * @param {Boolean} insertBefore Flag indicating whether nodes are inserted before or after `insertPosition`.\n\t * This is important only when `insertPosition` and this position are same. If that is the case and the flag is\n\t * set to `true`, this position will get transformed. If the flag is set to `false`, it won't.\n\t * @returns {module:engine/model/position~Position} Transformed position.\n\t */\n\t_getTransformedByInsertion( insertPosition, howMany, insertBefore ) {\n\t\tconst transformed = Position.createFromPosition( this );\n\n\t\t// This position can't be affected if insertion was in a different root.\n\t\tif ( this.root != insertPosition.root ) {\n\t\t\treturn transformed;\n\t\t}\n\n\t\tif ( compareArrays( insertPosition.getParentPath(), this.getParentPath() ) == 'same' ) {\n\t\t\t// If nodes are inserted in the node that is pointed by this position...\n\t\t\tif ( insertPosition.offset < this.offset || ( insertPosition.offset == this.offset && insertBefore ) ) {\n\t\t\t\t// And are inserted before an offset of that position...\n\t\t\t\t// \"Push\" this positions offset.\n\t\t\t\ttransformed.offset += howMany;\n\t\t\t}\n\t\t} else if ( compareArrays( insertPosition.getParentPath(), this.getParentPath() ) == 'prefix' ) {\n\t\t\t// If nodes are inserted in a node that is on a path to this position...\n\t\t\tconst i = insertPosition.path.length - 1;\n\n\t\t\tif ( insertPosition.offset <= this.path[ i ] ) {\n\t\t\t\t// And are inserted before next node of that path...\n\t\t\t\t// \"Push\" the index on that path.\n\t\t\t\ttransformed.path[ i ] += howMany;\n\t\t\t}\n\t\t}\n\n\t\treturn transformed;\n\t}\n\n\t/**\n\t * Returns a copy of this position that is updated by moving `howMany` nodes from `sourcePosition` to `targetPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} sourcePosition Position before the first element to move.\n\t * @param {module:engine/model/position~Position} targetPosition Position where moved elements will be inserted.\n\t * @param {Number} howMany How many consecutive nodes to move, starting from `sourcePosition`.\n\t * @param {Boolean} insertBefore Flag indicating whether moved nodes are pasted before or after `insertPosition`.\n\t * This is important only when `targetPosition` and this position are same. If that is the case and the flag is\n\t * set to `true`, this position will get transformed by range insertion. If the flag is set to `false`, it won't.\n\t * @param {Boolean} [sticky] Flag indicating whether this position \"sticks\" to range, that is if it should be moved\n\t * with the moved range if it is equal to one of range's boundaries.\n\t * @returns {module:engine/model/position~Position} Transformed position.\n\t */\n\t_getTransformedByMove( sourcePosition, targetPosition, howMany, insertBefore, sticky ) {\n\t\t// Moving a range removes nodes from their original position. We acknowledge this by proper transformation.\n\t\tlet transformed = this._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\t// Then we update target position, as it could be affected by nodes removal too.\n\t\ttargetPosition = targetPosition._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\tif ( transformed === null || ( sticky && transformed.isEqual( sourcePosition ) ) ) {\n\t\t\t// This position is inside moved range (or sticks to it).\n\t\t\t// In this case, we calculate a combination of this position, move source position and target position.\n\t\t\ttransformed = this._getCombined( sourcePosition, targetPosition );\n\t\t} else {\n\t\t\t// This position is not inside a removed range.\n\t\t\t// In next step, we simply reflect inserting `howMany` nodes, which might further affect the position.\n\t\t\ttransformed = transformed._getTransformedByInsertion( targetPosition, howMany, insertBefore );\n\t\t}\n\n\t\treturn transformed;\n\t}\n\n\t/**\n\t * Returns a new position that is a combination of this position and given positions.\n\t *\n\t * The combined position is a copy of this position transformed by moving a range starting at `source` position\n\t * to the `target` position. It is expected that this position is inside the moved range.\n\t *\n\t * Example:\n\t *\n\t *\t\tlet original = new Position( root, [ 2, 3, 1 ] );\n\t *\t\tlet source = new Position( root, [ 2, 2 ] );\n\t *\t\tlet target = new Position( otherRoot, [ 1, 1, 3 ] );\n\t *\t\toriginal._getCombined( source, target ); // path is [ 1, 1, 4, 1 ], root is `otherRoot`\n\t *\n\t * Explanation:\n\t *\n\t * We have a position `[ 2, 3, 1 ]` and move some nodes from `[ 2, 2 ]` to `[ 1, 1, 3 ]`. The original position\n\t * was inside moved nodes and now should point to the new place. The moved nodes will be after\n\t * positions `[ 1, 1, 3 ]`, `[ 1, 1, 4 ]`, `[ 1, 1, 5 ]`. Since our position was in the second moved node,\n\t * the transformed position will be in a sub-tree of a node at `[ 1, 1, 4 ]`. Looking at original path, we\n\t * took care of `[ 2, 3 ]` part of it. Now we have to add the rest of the original path to the transformed path.\n\t * Finally, the transformed position will point to `[ 1, 1, 4, 1 ]`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} source Beginning of the moved range.\n\t * @param {module:engine/model/position~Position} target Position where the range is moved.\n\t * @returns {module:engine/model/position~Position} Combined position.\n\t */\n\t_getCombined( source, target ) {\n\t\tconst i = source.path.length - 1;\n\n\t\t// The first part of a path to combined position is a path to the place where nodes were moved.\n\t\tconst combined = Position.createFromPosition( target );\n\n\t\t// Then we have to update the rest of the path.\n\n\t\t// Fix the offset because this position might be after `from` position and we have to reflect that.\n\t\tcombined.offset = combined.offset + this.path[ i ] - source.offset;\n\n\t\t// Then, add the rest of the path.\n\t\t// If this position is at the same level as `from` position nothing will get added.\n\t\tcombined.path = combined.path.concat( this.path.slice( i + 1 ) );\n\n\t\treturn combined;\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/model/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/model/item~Item model item} and `'before'` or `'after'` (sets position before or after given model item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link module:engine/model/position~Position.createBefore},\n\t * * {@link module:engine/model/position~Position.createAfter},\n\t * * {@link module:engine/model/position~Position.createFromParentAndOffset},\n\t * * {@link module:engine/model/position~Position.createFromPosition}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tstatic createAt( itemOrPosition, offset ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn this.createFromPosition( itemOrPosition );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.maxOffset;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this.createBefore( node );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this.createAfter( node );\n\t\t\t} else if ( !offset ) {\n\t\t\t\toffset = 0;\n\t\t\t}\n\n\t\t\treturn this.createFromParentAndOffset( node, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position, after given {@link module:engine/model/item~Item model item}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item after which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic createAfter( item ) {\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root element.\n\t\t\t *\n\t\t\t * @error model-position-after-root\n\t\t\t * @param {module:engine/model/item~Item} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-position-after-root: You cannot make a position after root.', { root: item } );\n\t\t}\n\n\t\treturn this.createFromParentAndOffset( item.parent, item.endOffset );\n\t}\n\n\t/**\n\t * Creates a new position, before the given {@link module:engine/model/item~Item model item}.\n\t *\n\t * @param {module:engine/model/item~Item} item Item before which the position should be placed.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic createBefore( item ) {\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position before a root element.\n\t\t\t *\n\t\t\t * @error model-position-before-root\n\t\t\t * @param {module:engine/model/item~Item} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-position-before-root: You cannot make a position before root.', { root: item } );\n\t\t}\n\n\t\treturn this.createFromParentAndOffset( item.parent, item.startOffset );\n\t}\n\n\t/**\n\t * Creates a new position from the parent element and an offset in that element.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent Position's parent.\n\t * @param {Number} offset Position's offset.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic createFromParentAndOffset( parent, offset ) {\n\t\tif ( !parent.is( 'element' ) && !parent.is( 'documentFragment' ) ) {\n\t\t\t/**\n\t\t\t * Position parent have to be a model element or model document fragment.\n\t\t\t *\n\t\t\t * @error model-position-parent-incorrect\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-position-parent-incorrect: Position parent have to be a element or document fragment.' );\n\t\t}\n\n\t\tconst path = parent.getPath();\n\n\t\tpath.push( offset );\n\n\t\treturn new this( parent.root, path );\n\t}\n\n\t/**\n\t * Creates a new position, which is equal to passed position.\n\t *\n\t * @param {module:engine/model/position~Position} position Position to be cloned.\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tstatic createFromPosition( position ) {\n\t\treturn new this( position.root, position.path.slice() );\n\t}\n\n\t/**\n\t * Creates a `Position` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Position`.\n\t * @returns {module:engine/model/position~Position} `Position` instance created using given plain object.\n\t */\n\tstatic fromJSON( json, doc ) {\n\t\tif ( json.root === '$graveyard' ) {\n\t\t\treturn new Position( doc.graveyard, json.path );\n\t\t}\n\n\t\tif ( !doc.getRoot( json.root ) ) {\n\t\t\t/**\n\t\t\t * Cannot create position for document. Root with specified name does not exist.\n\t\t\t *\n\t\t\t * @error model-position-fromjson-no-root\n\t\t\t * @param {String} rootName\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-position-fromjson-no-root: Cannot create position for document. Root with specified name does not exist.',\n\t\t\t\t{ rootName: json.root }\n\t\t\t);\n\t\t}\n\n\t\treturn new Position( doc.getRoot( json.root ), json.path );\n\t}\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/model/position~PositionRelation\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Range class. Range is iterable.\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** Constructor creates it's own {@link module:engine/model/position~Position Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/model/position~Position} start Start position.\n\t * @param {module:engine/model/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position}\n\t\t */\n\t\tthis.start = Position.createFromPosition( start );\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position}\n\t\t */\n\t\tthis.end = end ? Position.createFromPosition( end ) : Position.createFromPosition( start );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/model/item~Item items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/model/position~Position positions},\n\t * grouped as {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t * It iterates over all {@link module:engine/model/textproxy~TextProxy text contents} that are inside the range\n\t * and all the {@link module:engine/model/element~Element}s that are entered into when iterating over this range.\n\t *\n\t * This iterator uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range\n\t * and `ignoreElementEnd` option set to `true`.\n\t *\n\t * @returns {Iterable.<module:engine/model/treewalker~TreeWalkerValue>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is if {@link #start} and\n\t * {@link #end} positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link #start} position and\n\t * {@link #end} position are in the same {@link module:engine/model/position~Position#parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\treturn this.start.parent === this.end.parent;\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/model/position~Position position}.\n\t *\n\t * @param {module:engine/model/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/model/position~Position position} is contained\n\t * in this range,`false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link ~Range range}.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link ~Range range} boundaries are contained by this range, `false` otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Checks whether given {@link module:engine/model/item~Item} is inside this range.\n\t *\n\t * @param {module:engine/model/item~Item} item Model item to check.\n\t */\n\tcontainsItem( item ) {\n\t\tconst pos = Position.createBefore( item );\n\n\t\treturn this.containsPosition( pos ) || this.start.isEqual( pos );\n\t}\n\n\t/**\n\t * Two ranges are equal if their {@link #start} and {@link #end} positions are equal.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise.\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end );\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with given range.\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges intersect, `false` otherwise.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link ~Range range} is not a part of given {@link ~Range range}.\n\t * Returned array contains zero, one or two {@link ~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = new Range( new Position( root, [ 2, 7 ] ), new Position( root, [ 4, 0, 1 ] ) );\n\t *\t\tlet otherRange = new Range( new Position( root, [ 1 ] ), new Position( root, [ 5 ] ) );\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = new Range( new Position( root, [ 1 ] ), new Position( root, [ 3 ] ) );\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from [ 3 ] to [ 4, 0, 1 ]\n\t *\n\t *\t\totherRange = new Range( new Position( root, [ 3 ] ), new Position( root, [ 4 ] ) );\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from [ 2, 7 ] to [ 3 ] and from [ 4 ] to [ 4, 0, 1 ]\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.<module:engine/model/range~Range>} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( Range.createFromRange( this ) );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link ~Range range} and given {@link ~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = new Range( new Position( root, [ 2, 7 ] ), new Position( root, [ 4, 0, 1 ] ) );\n\t *\t\tlet otherRange = new Range( new Position( root, [ 1 ] ), new Position( root, [ 2 ] ) );\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // null - ranges have no common part\n\t *\n\t *\t\totherRange = new Range( new Position( root, [ 3 ] ), new Position( root, [ 5 ] ) );\n\t *\t\ttransformed = range.getIntersection( otherRange ); // range from [ 3 ] to [ 4, 0, 1 ]\n\t *\n\t * @param {module:engine/model/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/model/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Computes and returns the smallest set of {@link #isFlat flat} ranges, that covers this range in whole.\n\t *\n\t * See an example of a model structure (`[` and `]` are range boundaries):\n\t *\n\t *\t\troot                                                            root\n\t *\t\t |- element DIV                         DIV             P2              P3             DIV\n\t *\t\t |   |- element H                   H        P1        f o o           b a r       H         P4\n\t *\t\t |   |   |- \"fir[st\"             fir[st     lorem                               se]cond     ipsum\n\t *\t\t |   |- element P1\n\t *\t\t |   |   |- \"lorem\"                                              ||\n\t *\t\t |- element P2                                                   ||\n\t *\t\t |   |- \"foo\"                                                    VV\n\t *\t\t |- element P3\n\t *\t\t |   |- \"bar\"                                                   root\n\t *\t\t |- element DIV                         DIV             [P2             P3]             DIV\n\t *\t\t |   |- element H                   H       [P1]       f o o           b a r        H         P4\n\t *\t\t |   |   |- \"se]cond\"            fir[st]    lorem                               [se]cond     ipsum\n\t *\t\t |   |- element P4\n\t *\t\t |   |   |- \"ipsum\"\n\t *\n\t * As it can be seen, letters contained in the range are: `stloremfoobarse`, spread across different parents.\n\t * We are looking for minimal set of flat ranges that contains the same nodes.\n\t *\n\t * Minimal flat ranges for above range `( [ 0, 0, 3 ], [ 3, 0, 2 ] )` will be:\n\t *\n\t *\t\t( [ 0, 0, 3 ], [ 0, 0, 5 ] ) = \"st\"\n\t *\t\t( [ 0, 1 ], [ 0, 2 ] ) = element P1 (\"lorem\")\n\t *\t\t( [ 1 ], [ 3 ] ) = element P2, element P3 (\"foobar\")\n\t *\t\t( [ 3, 0, 0 ], [ 3, 0, 2 ] ) = \"se\"\n\t *\n\t * **Note:** if an {@link module:engine/model/element~Element element} is not wholly contained in this range, it won't be returned\n\t * in any of the returned flat ranges. See in the example how `H` elements at the beginning and at the end of the range\n\t * were omitted. Only their parts that were wholly in the range were returned.\n\t *\n\t * **Note:** this method is not returning flat ranges that contain no nodes.\n\t *\n\t * @returns {Array.<module:engine/model/range~Range>} Array of flat ranges covering this range.\n\t */\n\tgetMinimalFlatRanges() {\n\t\tconst ranges = [];\n\t\tconst diffAt = this.start.getCommonPath( this.end ).length;\n\n\t\tconst pos = Position.createFromPosition( this.start );\n\t\tlet posParent = pos.parent;\n\n\t\t// Go up.\n\t\twhile ( pos.path.length > diffAt + 1 ) {\n\t\t\tconst howMany = posParent.maxOffset - pos.offset;\n\n\t\t\tif ( howMany !== 0 ) {\n\t\t\t\tranges.push( new Range( pos, pos.getShiftedBy( howMany ) ) );\n\t\t\t}\n\n\t\t\tpos.path = pos.path.slice( 0, -1 );\n\t\t\tpos.offset++;\n\t\t\tposParent = posParent.parent;\n\t\t}\n\n\t\t// Go down.\n\t\twhile ( pos.path.length <= this.end.path.length ) {\n\t\t\tconst offset = this.end.path[ pos.path.length - 1 ];\n\t\t\tconst howMany = offset - pos.offset;\n\n\t\t\tif ( howMany !== 0 ) {\n\t\t\t\tranges.push( new Range( pos, pos.getShiftedBy( howMany ) ) );\n\t\t\t}\n\n\t\t\tpos.offset = offset;\n\t\t\tpos.path.push( 0 );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/model/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @param {module:engine/model/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/model/item~Item items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/model/item~Item model items},\n\t * not {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/model/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @method getItems\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/model/item~Item>}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/model/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/model/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/model/position~Position positions}, not {@link module:engine/model/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/model/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/model/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/model/position~Position>}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Returns a range that is a result of transforming this range by given `delta`.\n\t *\n\t * **Note:** transformation may break one range into multiple ranges (e.g. when a part of the range is\n\t * moved to a different part of document tree). For this reason, an array is returned by this method and it\n\t * may contain one or more `Range` instances.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} delta Delta to transform range by.\n\t * @returns {Array.<module:engine/model/range~Range>} Range which is the result of transformation.\n\t */\n\tgetTransformedByDelta( delta ) {\n\t\tconst ranges = [ Range.createFromRange( this ) ];\n\n\t\t// Operation types that a range can be transformed by.\n\t\tconst supportedTypes = new Set( [ 'insert', 'move', 'remove', 'reinsert' ] );\n\n\t\tfor ( const operation of delta.operations ) {\n\t\t\tif ( supportedTypes.has( operation.type ) ) {\n\t\t\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\t\t\tlet result;\n\n\t\t\t\t\tif ( operation.type == 'insert' ) {\n\t\t\t\t\t\tresult = ranges[ i ]._getTransformedByDocumentChange(\n\t\t\t\t\t\t\toperation.type,\n\t\t\t\t\t\t\tdelta.type,\n\t\t\t\t\t\t\toperation.position,\n\t\t\t\t\t\t\toperation.nodes.maxOffset\n\t\t\t\t\t\t);\n\t\t\t\t\t} else {\n\t\t\t\t\t\tresult = ranges[ i ]._getTransformedByDocumentChange(\n\t\t\t\t\t\t\toperation.type,\n\t\t\t\t\t\t\tdelta.type,\n\t\t\t\t\t\t\toperation.targetPosition,\n\t\t\t\t\t\t\toperation.howMany,\n\t\t\t\t\t\t\toperation.sourcePosition\n\t\t\t\t\t\t);\n\t\t\t\t\t}\n\n\t\t\t\t\tranges.splice( i, 1, ...result );\n\n\t\t\t\t\ti += result.length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns a range that is a result of transforming this range by multiple `deltas`.\n\t *\n\t * **Note:** transformation may break one range into multiple ranges (e.g. when a part of the range is\n\t * moved to a different part of document tree). For this reason, an array is returned by this method and it\n\t * may contain one or more `Range` instances.\n\t *\n\t * @param {Iterable.<module:engine/model/delta/delta~Delta>} deltas Deltas to transform the range by.\n\t * @returns {Array.<module:engine/model/range~Range>} Range which is the result of transformation.\n\t */\n\tgetTransformedByDeltas( deltas ) {\n\t\tconst ranges = [ Range.createFromRange( this ) ];\n\n\t\tfor ( const delta of deltas ) {\n\t\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\t\tconst result = ranges[ i ].getTransformedByDelta( delta );\n\n\t\t\t\tranges.splice( i, 1, ...result );\n\t\t\t\ti += result.length - 1;\n\t\t\t}\n\t\t}\n\n\t\t// It may happen that a range is split into two, and then the part of second \"piece\" is moved into first\n\t\t// \"piece\". In this case we will have incorrect third range, which should not be included in the result --\n\t\t// because it is already included in the first \"piece\". In this loop we are looking for all such ranges that\n\t\t// are inside other ranges and we simply remove them.\n\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\tconst range = ranges[ i ];\n\n\t\t\tfor ( let j = i + 1; j < ranges.length; j++ ) {\n\t\t\t\tconst next = ranges[ j ];\n\n\t\t\t\tif ( range.containsRange( next ) || next.containsRange( range ) || range.isEqual( next ) ) {\n\t\t\t\t\tranges.splice( j, 1 );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an {@link module:engine/model/element~Element} or {@link module:engine/model/documentfragment~DocumentFragment}\n\t * which is a common ancestor of the range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Returns a range that is a result of transforming this range by a change in the model document.\n\t *\n\t * @protected\n\t * @param {'insert'|'move'|'remove'|'reinsert'} type Change type.\n\t * @param {String} deltaType Type of delta that introduced the change.\n\t * @param {module:engine/model/position~Position} targetPosition Position before the first changed node.\n\t * @param {Number} howMany How many nodes has been changed.\n\t * @param {module:engine/model/position~Position} sourcePosition Source position of changes.\n\t * @returns {Array.<module:engine/model/range~Range>}\n\t */\n\t_getTransformedByDocumentChange( type, deltaType, targetPosition, howMany, sourcePosition ) {\n\t\tif ( type == 'insert' ) {\n\t\t\treturn this._getTransformedByInsertion( targetPosition, howMany, false, false );\n\t\t} else {\n\t\t\tconst sourceRange = Range.createFromPositionAndShift( sourcePosition, howMany );\n\n\t\t\t// Edge case for merge delta.\n\t\t\tif (\n\t\t\t\tdeltaType == 'merge' &&\n\t\t\t\tthis.isCollapsed &&\n\t\t\t\t( this.start.isEqual( sourceRange.start ) || this.start.isEqual( sourceRange.end ) )\n\t\t\t) {\n\t\t\t\t// Collapsed range is in merged element, at the beginning or at the end of it.\n\t\t\t\t// Without fix, the range would end up in the graveyard, together with removed element.\n\t\t\t\t// <p>foo</p><p>[]bar</p> -> <p>foobar</p><p>[]</p> -> <p>foobar</p> -> <p>foo[]bar</p>\n\t\t\t\t// <p>foo</p><p>bar[]</p> -> <p>foobar</p><p>[]</p> -> <p>foobar</p> -> <p>foobar[]</p>\n\t\t\t\t//\n\t\t\t\t// In most cases, `sourceRange.start.offset` for merge delta's move operation would be 0,\n\t\t\t\t// so this formula might look overcomplicated.\n\t\t\t\t// However in some scenarios, after operational transformation, move operation might not\n\t\t\t\t// in fact start from 0 and we need to properly count new offset.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-engine/pull/1133#issuecomment-329080668.\n\t\t\t\tconst offset = this.start.offset - sourceRange.start.offset;\n\n\t\t\t\treturn [ new Range( targetPosition.getShiftedBy( offset ) ) ];\n\t\t\t}\n\t\t\t//\n\t\t\t// Edge case for split delta.\n\t\t\t//\n\t\t\tif ( deltaType == 'split' && this.isCollapsed && this.end.isEqual( sourceRange.end ) ) {\n\t\t\t\t// Collapsed range is at the end of split element.\n\t\t\t\t// Without fix, the range would end up at the end of split (old) element instead of at the end of new element.\n\t\t\t\t// That would happen because this range is not technically inside moved range. Last step below shows the fix.\n\t\t\t\t// <p>foobar[]</p> -> <p>foobar[]</p><p></p> -> <p>foo[]</p><p>bar</p> -> <p>foo</p><p>bar[]</p>\n\t\t\t\treturn [ new Range( targetPosition.getShiftedBy( howMany ) ) ];\n\t\t\t}\n\t\t\t//\n\t\t\t// Other edge cases:\n\t\t\t//\n\t\t\t// In all examples `[]` is `this` and `{}` is `sourceRange`, while `^` is move target position.\n\t\t\t//\n\t\t\t// Example:\n\t\t\t// <p>xx</p>^<w>{<p>a[b</p>}</w><p>c]d</p>   -->   <p>xx</p><p>a[b</p><w></w><p>c]d</p>\n\t\t\t// ^<p>xx</p><w>{<p>a[b</p>}</w><p>c]d</p>   -->   <p>a[b</p><p>xx</p><w></w><p>c]d</p>  // Note <p>xx</p> inclusion.\n\t\t\t// <w>{<p>a[b</p>}</w>^<p>c]d</p>            -->   <w></w><p>a[b</p><p>c]d</p>\n\t\t\tif (\n\t\t\t\t( sourceRange.containsPosition( this.start ) || sourceRange.start.isEqual( this.start ) ) &&\n\t\t\t\tthis.containsPosition( sourceRange.end ) &&\n\t\t\t\tthis.end.isAfter( targetPosition )\n\t\t\t) {\n\t\t\t\tconst start = this.start._getCombined(\n\t\t\t\t\tsourcePosition,\n\t\t\t\t\ttargetPosition._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t\t);\n\t\t\t\tconst end = this.end._getTransformedByMove( sourcePosition, targetPosition, howMany, false, false );\n\n\t\t\t\treturn [ new Range( start, end ) ];\n\t\t\t}\n\n\t\t\t// Example:\n\t\t\t// <p>c[d</p><w>{<p>a]b</p>}</w>^<p>xx</p>   -->   <p>c[d</p><w></w><p>a]b</p><p>xx</p>\n\t\t\t// <p>c[d</p><w>{<p>a]b</p>}</w><p>xx</p>^   -->   <p>c[d</p><w></w><p>xx</p><p>a]b</p>  // Note <p>xx</p> inclusion.\n\t\t\t// <p>c[d</p>^<w>{<p>a]b</p>}</w>            -->   <p>c[d</p><p>a]b</p><w></w>\n\t\t\tif (\n\t\t\t\t( sourceRange.containsPosition( this.end ) || sourceRange.end.isEqual( this.end ) ) &&\n\t\t\t\tthis.containsPosition( sourceRange.start ) &&\n\t\t\t\tthis.start.isBefore( targetPosition )\n\t\t\t) {\n\t\t\t\tconst start = this.start._getTransformedByMove(\n\t\t\t\t\tsourcePosition,\n\t\t\t\t\ttargetPosition,\n\t\t\t\t\thowMany,\n\t\t\t\t\ttrue,\n\t\t\t\t\tfalse\n\t\t\t\t);\n\t\t\t\tconst end = this.end._getCombined(\n\t\t\t\t\tsourcePosition,\n\t\t\t\t\ttargetPosition._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t\t);\n\n\t\t\t\treturn [ new Range( start, end ) ];\n\t\t\t}\n\n\t\t\treturn this._getTransformedByMove( sourcePosition, targetPosition, howMany );\n\t\t}\n\t}\n\n\t/**\n\t * Returns an array containing one or two {@link ~Range ranges} that are a result of transforming this\n\t * {@link ~Range range} by inserting `howMany` nodes at `insertPosition`. Two {@link ~Range ranges} are\n\t * returned if the insertion was inside this {@link ~Range range} and `spread` is set to `true`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet range = new Range( new Position( root, [ 2, 7 ] ), new Position( root, [ 4, 0, 1 ] ) );\n\t *\t\tlet transformed = range._getTransformedByInsertion( new Position( root, [ 1 ] ), 2 );\n\t *\t\t// transformed array has one range from [ 4, 7 ] to [ 6, 0, 1 ]\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( new Position( root, [ 4, 0, 0 ] ), 4 );\n\t *\t\t// transformed array has one range from [ 2, 7 ] to [ 4, 0, 5 ]\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( new Position( root, [ 3, 2 ] ), 4 );\n\t *\t\t// transformed array has one range, which is equal to original range\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( new Position( root, [ 3, 2 ] ), 4, true );\n\t *\t\t// transformed array has two ranges: from [ 2, 7 ] to [ 3, 2 ] and from [ 3, 6 ] to [ 4, 0, 1 ]\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( new Position( root, [ 4, 0, 1 ] ), 4, false, false );\n\t *\t\t// transformed array has one range which is equal to original range because insertion is after the range boundary\n\t *\n\t *\t\ttransformed = range._getTransformedByInsertion( new Position( root, [ 4, 0, 1 ] ), 4, false, true );\n\t *\t\t// transformed array has one range: from [ 2, 7 ] to [ 4, 0, 5 ] because range was expanded\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} insertPosition Position where nodes are inserted.\n\t * @param {Number} howMany How many nodes are inserted.\n\t * @param {Boolean} [spread] Flag indicating whether this {~Range range} should be spread if insertion\n\t * was inside the range. Defaults to `false`.\n\t * @param {Boolean} [isSticky] Flag indicating whether insertion should expand a range if it is in a place of\n\t * range boundary. Defaults to `false`.\n\t * @returns {Array.<module:engine/model/range~Range>} Result of the transformation.\n\t */\n\t_getTransformedByInsertion( insertPosition, howMany, spread = false, isSticky = false ) {\n\t\tif ( spread && this.containsPosition( insertPosition ) ) {\n\t\t\t// Range has to be spread. The first part is from original start to the spread point.\n\t\t\t// The other part is from spread point to the original end, but transformed by\n\t\t\t// insertion to reflect insertion changes.\n\n\t\t\treturn [\n\t\t\t\tnew Range( this.start, insertPosition ),\n\t\t\t\tnew Range(\n\t\t\t\t\tinsertPosition._getTransformedByInsertion( insertPosition, howMany, true ),\n\t\t\t\t\tthis.end._getTransformedByInsertion( insertPosition, howMany, this.isCollapsed )\n\t\t\t\t)\n\t\t\t];\n\t\t} else {\n\t\t\tconst range = Range.createFromRange( this );\n\n\t\t\tconst insertBeforeStart = !isSticky;\n\t\t\tconst insertBeforeEnd = range.isCollapsed ? true : isSticky;\n\n\t\t\trange.start = range.start._getTransformedByInsertion( insertPosition, howMany, insertBeforeStart );\n\t\t\trange.end = range.end._getTransformedByInsertion( insertPosition, howMany, insertBeforeEnd );\n\n\t\t\treturn [ range ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns an array containing {@link ~Range ranges} that are a result of transforming this\n\t * {@link ~Range range} by moving `howMany` nodes from `sourcePosition` to `targetPosition`.\n\t *\n\t * @protected\n\t * @param {module:engine/model/position~Position} sourcePosition Position from which nodes are moved.\n\t * @param {module:engine/model/position~Position} targetPosition Position to where nodes are moved.\n\t * @param {Number} howMany How many nodes are moved.\n\t * @returns {Array.<module:engine/model/range~Range>} Result of the transformation.\n\t */\n\t_getTransformedByMove( sourcePosition, targetPosition, howMany ) {\n\t\tif ( this.isCollapsed ) {\n\t\t\tconst newPos = this.start._getTransformedByMove( sourcePosition, targetPosition, howMany, true, false );\n\n\t\t\treturn [ new Range( newPos ) ];\n\t\t}\n\n\t\tlet result;\n\n\t\tconst moveRange = new Range( sourcePosition, sourcePosition.getShiftedBy( howMany ) );\n\n\t\tconst differenceSet = this.getDifference( moveRange );\n\t\tlet difference = null;\n\n\t\tconst common = this.getIntersection( moveRange );\n\n\t\tif ( differenceSet.length == 1 ) {\n\t\t\t// `moveRange` and this range may intersect.\n\t\t\tdifference = new Range(\n\t\t\t\tdifferenceSet[ 0 ].start._getTransformedByDeletion( sourcePosition, howMany ),\n\t\t\t\tdifferenceSet[ 0 ].end._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t);\n\t\t} else if ( differenceSet.length == 2 ) {\n\t\t\t// `moveRange` is inside this range.\n\t\t\tdifference = new Range(\n\t\t\t\tthis.start,\n\t\t\t\tthis.end._getTransformedByDeletion( sourcePosition, howMany )\n\t\t\t);\n\t\t} // else, `moveRange` contains this range.\n\n\t\tconst insertPosition = targetPosition._getTransformedByDeletion( sourcePosition, howMany );\n\n\t\tif ( difference ) {\n\t\t\tresult = difference._getTransformedByInsertion( insertPosition, howMany, common !== null );\n\t\t} else {\n\t\t\tresult = [];\n\t\t}\n\n\t\tif ( common ) {\n\t\t\tresult.push( new Range(\n\t\t\t\tcommon.start._getCombined( moveRange.start, insertPosition ),\n\t\t\t\tcommon.end._getCombined( moveRange.start, insertPosition )\n\t\t\t) );\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/model/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @param {module:engine/model/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range from given parents and offsets.\n\t *\n\t * @param {module:engine/model/element~Element} startElement Start position parent element.\n\t * @param {Number} startOffset Start position offset.\n\t * @param {module:engine/model/element~Element} endElement End position parent element.\n\t * @param {Number} endOffset End position offset.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic createFromParentsAndOffsets( startElement, startOffset, endElement, endOffset ) {\n\t\treturn new this(\n\t\t\tPosition.createFromParentAndOffset( startElement, startOffset ),\n\t\t\tPosition.createFromParentAndOffset( endElement, endOffset )\n\t\t);\n\t}\n\n\t/**\n\t * Creates a new instance of `Range` which is equal to passed range.\n\t *\n\t * @param {module:engine/model/range~Range} range Range to clone.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic createFromRange( range ) {\n\t\treturn new this( range.start, range.end );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/model/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic createIn( element ) {\n\t\treturn this.createFromParentsAndOffsets( element, 0, element, element.maxOffset );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/model/item~Item model item} and ends after it.\n\t *\n\t * @param {module:engine/model/item~Item} item\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tstatic createOn( item ) {\n\t\treturn this.createFromPositionAndShift( Position.createBefore( item ), item.offsetSize );\n\t}\n\n\t/**\n\t * Creates a collapsed range at given {@link module:engine/model/position~Position position}\n\t * or on the given {@link module:engine/model/item~Item item}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tstatic createCollapsedAt( itemOrPosition, offset ) {\n\t\tconst start = Position.createAt( itemOrPosition, offset );\n\t\tconst end = Position.createFromPosition( start );\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Combines all ranges from the passed array into a one range. At least one range has to be passed.\n\t * Passed ranges must not have common parts.\n\t *\n\t * The first range from the array is a reference range. If other ranges start or end on the exactly same position where\n\t * the reference range, they get combined into one range.\n\t *\n\t *\t\t[  ][]  [    ][ ][             ][ ][]  [  ]  // Passed ranges, shown sorted\n\t *\t\t[    ]                                       // The result of the function if the first range was a reference range.\n\t *\t            [                           ]        // The result of the function if the third-to-seventh range was a reference range.\n\t *\t                                           [  ]  // The result of the function if the last range was a reference range.\n\t *\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to combine.\n\t * @returns {module:engine/model/range~Range} Combined range.\n\t */\n\tstatic createFromRanges( ranges ) {\n\t\tif ( ranges.length === 0 ) {\n\t\t\t/**\n\t\t\t * At least one range has to be passed to\n\t\t\t * {@link module:engine/model/range~Range.createFromRanges `Range.createFromRanges()`}.\n\t\t\t *\n\t\t\t * @error range-create-from-ranges-empty-array\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'range-create-from-ranges-empty-array: At least one range has to be passed.' );\n\t\t} else if ( ranges.length == 1 ) {\n\t\t\treturn this.createFromRange( ranges[ 0 ] );\n\t\t}\n\n\t\t// 1. Set the first range in `ranges` array as a reference range.\n\t\t// If we are going to return just a one range, one of the ranges need to be the reference one.\n\t\t// Other ranges will be stuck to that range, if possible.\n\t\tconst ref = ranges[ 0 ];\n\n\t\t// 2. Sort all the ranges so it's easier to process them.\n\t\tranges.sort( ( a, b ) => {\n\t\t\treturn a.start.isAfter( b.start ) ? 1 : -1;\n\t\t} );\n\n\t\t// 3. Check at which index the reference range is now.\n\t\tconst refIndex = ranges.indexOf( ref );\n\n\t\t// 4. At this moment we don't need the original range.\n\t\t// We are going to modify the result and we need to return a new instance of Range.\n\t\t// We have to create a copy of the reference range.\n\t\tconst result = new this( ref.start, ref.end );\n\n\t\t// 5. Ranges should be checked and glued starting from the range that is closest to the reference range.\n\t\t// Since ranges are sorted, start with the range with index that is closest to reference range index.\n\t\tfor ( let i = refIndex - 1; i >= 0; i++ ) {\n\t\t\tif ( ranges[ i ].end.isEqual( result.start ) ) {\n\t\t\t\tresult.start = Position.createFromPosition( ranges[ i ].start );\n\t\t\t} else {\n\t\t\t\t// If ranges are not starting/ending at the same position there is no point in looking further.\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\t// 6. Ranges should be checked and glued starting from the range that is closest to the reference range.\n\t\t// Since ranges are sorted, start with the range with index that is closest to reference range index.\n\t\tfor ( let i = refIndex + 1; i < ranges.length; i++ ) {\n\t\t\tif ( ranges[ i ].start.isEqual( result.end ) ) {\n\t\t\t\tresult.end = Position.createFromPosition( ranges[ i ].end );\n\t\t\t} else {\n\t\t\t\t// If ranges are not starting/ending at the same position there is no point in looking further.\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Creates a `Range` instance from given plain object (i.e. parsed JSON string).\n\t *\n\t * @param {Object} json Plain object to be converted to `Range`.\n\t * @param {module:engine/model/document~Document} doc Document object that will be range owner.\n\t * @returns {module:engine/model/element~Element} `Range` instance created using given plain object.\n\t */\n\tstatic fromJSON( json, doc ) {\n\t\treturn new this( Position.fromJSON( json.start, doc ), Position.fromJSON( json.end, doc ) );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/mapper\n */\n\nimport ModelPosition from '../model/position';\nimport ModelRange from '../model/range';\n\nimport ViewPosition from '../view/position';\nimport ViewRange from '../view/range';\nimport ViewText from '../view/text';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Maps elements, positions and markers between {@link module:engine/view/document~Document the view} and\n * {@link module:engine/model/model the model}.\n *\n * Mapper use bound elements to find corresponding elements and positions, so, to get proper results,\n * all model elements should be {@link module:engine/conversion/mapper~Mapper#bindElements bound}.\n *\n * To map complex model to/from view relations, you may provide custom callbacks for\n * {@link module:engine/conversion/mapper~Mapper#event:modelToViewPosition modelToViewPosition event} and\n * {@link module:engine/conversion/mapper~Mapper#event:viewToModelPosition viewToModelPosition event} that are fired whenever\n * a position mapping request occurs.\n * Those events are fired by {@link module:engine/conversion/mapper~Mapper#toViewPosition toViewPosition}\n * and {@link module:engine/conversion/mapper~Mapper#toModelPosition toModelPosition} methods. `Mapper` adds it's own default callbacks\n * with `'lowest'` priority. To override default `Mapper` mapping, add custom callback with higher priority and\n * stop the event.\n */\nexport default class Mapper {\n\t/**\n\t * Creates an instance of the mapper.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Model element to view element mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._modelToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * View element to model element mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap}\n\t\t */\n\t\tthis._viewToModelMapping = new WeakMap();\n\n\t\t/**\n\t\t * A map containing callbacks between view element names and functions evaluating length of view elements\n\t\t * in model.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._viewToModelLengthCallbacks = new Map();\n\n\t\t/**\n\t\t * Model marker name to view elements mapping.\n\t\t *\n\t\t * Keys are `String`s while values are `Set`s with {@link module:engine/view/element~Element view elements}.\n\t\t * One marker (name) can be mapped to multiple elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._markerNameToElements = new Map();\n\n\t\t// Default mapper algorithm for mapping model position to view position.\n\t\tthis.on( 'modelToViewPosition', ( evt, data ) => {\n\t\t\tif ( data.viewPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst viewContainer = this._modelToViewMapping.get( data.modelPosition.parent );\n\n\t\t\tdata.viewPosition = this._findPositionIn( viewContainer, data.modelPosition.offset );\n\t\t}, { priority: 'low' } );\n\n\t\t// Default mapper algorithm for mapping view position to model position.\n\t\tthis.on( 'viewToModelPosition', ( evt, data ) => {\n\t\t\tif ( data.modelPosition ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tlet viewBlock = data.viewPosition.parent;\n\t\t\tlet modelParent = this._viewToModelMapping.get( viewBlock );\n\n\t\t\twhile ( !modelParent ) {\n\t\t\t\tviewBlock = viewBlock.parent;\n\t\t\t\tmodelParent = this._viewToModelMapping.get( viewBlock );\n\t\t\t}\n\n\t\t\tconst modelOffset = this._toModelOffset( data.viewPosition.parent, data.viewPosition.offset, viewBlock );\n\n\t\t\tdata.modelPosition = ModelPosition.createFromParentAndOffset( modelParent, modelOffset );\n\t\t}, { priority: 'low' } );\n\t}\n\n\t/**\n\t * Marks model and view elements as corresponding. Corresponding elements can be retrieved by using\n\t * the {@link module:engine/conversion/mapper~Mapper#toModelElement toModelElement} and\n\t * {@link module:engine/conversion/mapper~Mapper#toViewElement toViewElement} methods.\n\t * The information that elements are bound is also used to translate positions.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element.\n\t * @param {module:engine/view/element~Element} viewElement View element.\n\t */\n\tbindElements( modelElement, viewElement ) {\n\t\tthis._modelToViewMapping.set( modelElement, viewElement );\n\t\tthis._viewToModelMapping.set( viewElement, modelElement );\n\t}\n\n\t/**\n\t * Unbinds given {@link module:engine/view/element~Element view element} from the map.\n\t *\n\t * **Note:** view-to-model binding will be removed, if it existed. However, corresponding model-to-view binding\n\t * will be removed only if model element is still bound to passed `viewElement`.\n\t *\n\t * This behavior lets for re-binding model element to another view element without fear of losing the new binding\n\t * when the previously bound view element is unbound.\n\t *\n\t * @param {module:engine/view/element~Element} viewElement View element to unbind.\n\t */\n\tunbindViewElement( viewElement ) {\n\t\tconst modelElement = this.toModelElement( viewElement );\n\n\t\tthis._viewToModelMapping.delete( viewElement );\n\n\t\tif ( this._modelToViewMapping.get( modelElement ) == viewElement ) {\n\t\t\tthis._modelToViewMapping.delete( modelElement );\n\t\t}\n\t}\n\n\t/**\n\t * Unbinds given {@link module:engine/model/element~Element model element} from the map.\n\t *\n\t * **Note:** model-to-view binding will be removed, if it existed. However, corresponding view-to-model binding\n\t * will be removed only if view element is still bound to passed `modelElement`.\n\t *\n\t * This behavior lets for re-binding view element to another model element without fear of losing the new binding\n\t * when the previously bound model element is unbound.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element to unbind.\n\t */\n\tunbindModelElement( modelElement ) {\n\t\tconst viewElement = this.toViewElement( modelElement );\n\n\t\tthis._modelToViewMapping.delete( modelElement );\n\n\t\tif ( this._viewToModelMapping.get( viewElement ) == modelElement ) {\n\t\t\tthis._viewToModelMapping.delete( viewElement );\n\t\t}\n\t}\n\n\t/**\n\t * Binds given marker name with given {@link module:engine/view/element~Element view element}. The element\n\t * will be added to the current set of elements bound with given marker name.\n\t *\n\t * @param {module:engine/view/element~Element} element Element to bind.\n\t * @param {String} name Marker name.\n\t */\n\tbindElementToMarker( element, name ) {\n\t\tconst elements = this._markerNameToElements.get( name ) || new Set();\n\n\t\telements.add( element );\n\n\t\tthis._markerNameToElements.set( name, elements );\n\t}\n\n\t/**\n\t * Unbinds all elements from given marker name.\n\t *\n\t * @param {String} name Marker name.\n\t */\n\tunbindElementsFromMarkerName( name ) {\n\t\tthis._markerNameToElements.delete( name );\n\t}\n\n\t/**\n\t * Removes all model to view and view to model bindings.\n\t */\n\tclearBindings() {\n\t\tthis._modelToViewMapping = new WeakMap();\n\t\tthis._viewToModelMapping = new WeakMap();\n\t\tthis._markerNameToElements = new Map();\n\t}\n\n\t/**\n\t * Gets the corresponding model element.\n\t *\n\t * **Note:** {@link module:engine/view/uielement~UIElement} does not have corresponding element in model.\n\t *\n\t * @param {module:engine/view/element~Element} viewElement View element.\n\t * @returns {module:engine/model/element~Element|undefined} Corresponding model element or `undefined` if not found.\n\t */\n\ttoModelElement( viewElement ) {\n\t\treturn this._viewToModelMapping.get( viewElement );\n\t}\n\n\t/**\n\t * Gets the corresponding view element.\n\t *\n\t * @param {module:engine/model/element~Element} modelElement Model element.\n\t * @returns {module:engine/view/element~Element|undefined} Corresponding view element or `undefined` if not found.\n\t */\n\ttoViewElement( modelElement ) {\n\t\treturn this._modelToViewMapping.get( modelElement );\n\t}\n\n\t/**\n\t * Gets the corresponding model range.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {module:engine/model/range~Range} Corresponding model range.\n\t */\n\ttoModelRange( viewRange ) {\n\t\treturn new ModelRange( this.toModelPosition( viewRange.start ), this.toModelPosition( viewRange.end ) );\n\t}\n\n\t/**\n\t * Gets the corresponding view range.\n\t *\n\t * @param {module:engine/model/range~Range} modelRange Model range.\n\t * @returns {module:engine/view/range~Range} Corresponding view range.\n\t */\n\ttoViewRange( modelRange ) {\n\t\treturn new ViewRange( this.toViewPosition( modelRange.start ), this.toViewPosition( modelRange.end ) );\n\t}\n\n\t/**\n\t * Gets the corresponding model position.\n\t *\n\t * @fires viewToModelPosition\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {module:engine/model/position~Position} Corresponding model position.\n\t */\n\ttoModelPosition( viewPosition ) {\n\t\tconst data = {\n\t\t\tviewPosition,\n\t\t\tmapper: this\n\t\t};\n\n\t\tthis.fire( 'viewToModelPosition', data );\n\n\t\treturn data.modelPosition;\n\t}\n\n\t/**\n\t * Gets the corresponding view position.\n\t *\n\t * @fires modelToViewPosition\n\t * @param {module:engine/model/position~Position} modelPosition Model position.\n\t * @param {Object} [options] Additional options for position mapping process.\n\t * @param {Boolean} [options.isPhantom=false] Should be set to `true` if the model position to map is pointing to a place\n\t * in model tree which no longer exists. For example, it could be an end of a removed model range.\n\t * @returns {module:engine/view/position~Position} Corresponding view position.\n\t */\n\ttoViewPosition( modelPosition, options = { isPhantom: false } ) {\n\t\tconst data = {\n\t\t\tmodelPosition,\n\t\t\tmapper: this,\n\t\t\tisPhantom: options.isPhantom\n\t\t};\n\n\t\tthis.fire( 'modelToViewPosition', data );\n\n\t\treturn data.viewPosition;\n\t}\n\n\t/**\n\t * Gets all view elements bound to the given marker name.\n\t *\n\t * @param {String} name Marker name.\n\t * @returns {Set.<module:engine/view/element~Element>|null} View elements bound with given marker name or `null`\n\t * if no elements are bound to given marker name.\n\t */\n\tmarkerNameToElements( name ) {\n\t\tconst boundElements = this._markerNameToElements.get( name );\n\n\t\tif ( !boundElements ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst elements = new Set();\n\n\t\tfor ( const element of boundElements ) {\n\t\t\tif ( element.is( 'attributeElement' ) ) {\n\t\t\t\tfor ( const clone of element.getElementsWithSameId() ) {\n\t\t\t\t\telements.add( clone );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\telements.add( element );\n\t\t\t}\n\t\t}\n\n\t\treturn elements;\n\t}\n\n\t/**\n\t * Registers a callback that evaluates the length in the model of a view element with given name.\n\t *\n\t * The callback is fired with one argument, which is a view element instance. The callback is expected to return\n\t * a number representing the length of view element in model.\n\t *\n\t *\t\t// List item in view may contain nested list, which have other list items. In model though,\n\t *\t\t// the lists are represented by flat structure. Because of those differences, length of list view element\n\t *\t\t// may be greater than one. In the callback it's checked how many nested list items are in evaluated list item.\n\t *\n\t *\t\tfunction getViewListItemLength( element ) {\n\t *\t\t\tlet length = 1;\n\t *\n\t *\t\t\tfor ( let child of element.getChildren() ) {\n\t *\t\t\t\tif ( child.name == 'ul' || child.name == 'ol' ) {\n\t *\t\t\t\t\tfor ( let item of child.getChildren() ) {\n\t *\t\t\t\t\t\tlength += getViewListItemLength( item );\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\n\t *\t\t\treturn length;\n\t *\t\t}\n\t *\n\t *\t\tmapper.registerViewToModelLength( 'li', getViewListItemLength );\n\t *\n\t * @param {String} viewElementName Name of view element for which callback is registered.\n\t * @param {Function} lengthCallback Function return a length of view element instance in model.\n\t */\n\tregisterViewToModelLength( viewElementName, lengthCallback ) {\n\t\tthis._viewToModelLengthCallbacks.set( viewElementName, lengthCallback );\n\t}\n\n\t/**\n\t * Calculates model offset based on the view position and the block element.\n\t *\n\t * Example:\n\t *\n\t *\t\t<p>foo<b>ba|r</b></p> // _toModelOffset( b, 2, p ) -> 5\n\t *\n\t * Is a sum of:\n\t *\n\t *\t\t<p>foo|<b>bar</b></p> // _toModelOffset( p, 3, p ) -> 3\n\t *\t\t<p>foo<b>ba|r</b></p> // _toModelOffset( b, 2, b ) -> 2\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewParent Position parent.\n\t * @param {Number} viewOffset Position offset.\n\t * @param {module:engine/view/element~Element} viewBlock Block used as a base to calculate offset.\n\t * @returns {Number} Offset in the model.\n\t */\n\t_toModelOffset( viewParent, viewOffset, viewBlock ) {\n\t\tif ( viewBlock != viewParent ) {\n\t\t\t// See example.\n\t\t\tconst offsetToParentStart = this._toModelOffset( viewParent.parent, viewParent.index, viewBlock );\n\t\t\tconst offsetInParent = this._toModelOffset( viewParent, viewOffset, viewParent );\n\n\t\t\treturn offsetToParentStart + offsetInParent;\n\t\t}\n\n\t\t// viewBlock == viewParent, so we need to calculate the offset in the parent element.\n\n\t\t// If the position is a text it is simple (\"ba|r\" -> 2).\n\t\tif ( viewParent.is( 'text' ) ) {\n\t\t\treturn viewOffset;\n\t\t}\n\n\t\t// If the position is in an element we need to sum lengths of siblings ( <b> bar </b> foo | -> 3 + 3 = 6 ).\n\t\tlet modelOffset = 0;\n\n\t\tfor ( let i = 0; i < viewOffset; i++ ) {\n\t\t\tmodelOffset += this.getModelLength( viewParent.getChild( i ) );\n\t\t}\n\n\t\treturn modelOffset;\n\t}\n\n\t/**\n\t * Gets the length of the view element in the model.\n\t *\n\t * The length is calculated as follows:\n\t * * if {@link #registerViewToModelLength length mapping callback} is provided for given `viewNode` it is used to\n\t * evaluate model length (`viewNode` is used as first and only parameter passed to the callback),\n\t * * length of a {@link module:engine/view/text~Text text node} is equal to the length of it's\n\t * {@link module:engine/view/text~Text#data data},\n\t * * length of a {@link module:engine/view/uielement~UIElement ui element} is equal to 0,\n\t * * length of a mapped {@link module:engine/view/element~Element element} is equal to 1,\n\t * * length of a not-mapped {@link module:engine/view/element~Element element} is equal to the length of it's children.\n\t *\n\t * Examples:\n\t *\n\t *\t\tfoo                          -> 3 // Text length is equal to it's data length.\n\t *\t\t<p>foo</p>                   -> 1 // Length of an element which is mapped is by default equal to 1.\n\t *\t\t<b>foo</b>                   -> 3 // Length of an element which is not mapped is a length of its children.\n\t *\t\t<div><p>x</p><p>y</p></div>  -> 2 // Assuming that <div> is not mapped and <p> are mapped.\n\t *\n\t * @param {module:engine/view/element~Element} viewNode View node.\n\t * @returns {Number} Length of the node in the tree model.\n\t */\n\tgetModelLength( viewNode ) {\n\t\tif ( this._viewToModelLengthCallbacks.get( viewNode.name ) ) {\n\t\t\tconst callback = this._viewToModelLengthCallbacks.get( viewNode.name );\n\n\t\t\treturn callback( viewNode );\n\t\t} else if ( this._viewToModelMapping.has( viewNode ) ) {\n\t\t\treturn 1;\n\t\t} else if ( viewNode.is( 'text' ) ) {\n\t\t\treturn viewNode.data.length;\n\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\treturn 0;\n\t\t} else {\n\t\t\tlet len = 0;\n\n\t\t\tfor ( const child of viewNode.getChildren() ) {\n\t\t\t\tlen += this.getModelLength( child );\n\t\t\t}\n\n\t\t\treturn len;\n\t\t}\n\t}\n\n\t/**\n\t * Finds the position in the view node (or its children) with the expected model offset.\n\t *\n\t * Example:\n\t *\n\t *\t\t<p>fo<b>bar</b>bom</p> -> expected offset: 4\n\t *\n\t *\t\t_findPositionIn( p, 4 ):\n\t *\t\t<p>|fo<b>bar</b>bom</p> -> expected offset: 4, actual offset: 0\n\t *\t\t<p>fo|<b>bar</b>bom</p> -> expected offset: 4, actual offset: 2\n\t *\t\t<p>fo<b>bar</b>|bom</p> -> expected offset: 4, actual offset: 5 -> we are too far\n\t *\n\t *\t\t_findPositionIn( b, 4 - ( 5 - 3 ) ):\n\t *\t\t<p>fo<b>|bar</b>bom</p> -> expected offset: 2, actual offset: 0\n\t *\t\t<p>fo<b>bar|</b>bom</p> -> expected offset: 2, actual offset: 3 -> we are too far\n\t *\n\t *\t\t_findPositionIn( bar, 2 - ( 3 - 3 ) ):\n\t *\t\tWe are in the text node so we can simple find the offset.\n\t *\t\t<p>fo<b>ba|r</b>bom</p> -> expected offset: 2, actual offset: 2 -> position found\n\t *\n\t * @private\n\t * @param {module:engine/view/element~Element} viewParent Tree view element in which we are looking for the position.\n\t * @param {Number} expectedOffset Expected offset.\n\t * @returns {module:engine/view/position~Position} Found position.\n\t */\n\t_findPositionIn( viewParent, expectedOffset ) {\n\t\t// Last scanned view node.\n\t\tlet viewNode;\n\t\t// Length of the last scanned view node.\n\t\tlet lastLength = 0;\n\n\t\tlet modelOffset = 0;\n\t\tlet viewOffset = 0;\n\n\t\t// In the text node it is simple: offset in the model equals offset in the text.\n\t\tif ( viewParent.is( 'text' ) ) {\n\t\t\treturn new ViewPosition( viewParent, expectedOffset );\n\t\t}\n\n\t\t// In other cases we add lengths of child nodes to find the proper offset.\n\n\t\t// If it is smaller we add the length.\n\t\twhile ( modelOffset < expectedOffset ) {\n\t\t\tviewNode = viewParent.getChild( viewOffset );\n\t\t\tlastLength = this.getModelLength( viewNode );\n\t\t\tmodelOffset += lastLength;\n\t\t\tviewOffset++;\n\t\t}\n\n\t\t// If it equals we found the position.\n\t\tif ( modelOffset == expectedOffset ) {\n\t\t\treturn this._moveViewPositionToTextNode( new ViewPosition( viewParent, viewOffset ) );\n\t\t}\n\t\t// If it is higher we need to enter last child.\n\t\telse {\n\t\t\t// ( modelOffset - lastLength ) is the offset to the child we enter,\n\t\t\t// so we subtract it from the expected offset to fine the offset in the child.\n\t\t\treturn this._findPositionIn( viewNode, expectedOffset - ( modelOffset - lastLength ) );\n\t\t}\n\t}\n\n\t/**\n\t * Because we prefer positions in text nodes over positions next to text node moves view position to the text node\n\t * if it was next to it.\n\t *\n\t *\t\t<p>[]<b>foo</b></p> -> <p>[]<b>foo</b></p> // do not touch if position is not directly next to text\n\t *\t\t<p>foo[]<b>foo</b></p> -> <p>foo{}<b>foo</b></p> // move to text node\n\t *\t\t<p><b>[]foo</b></p> -> <p><b>{}foo</b></p> // move to text node\n\t *\n\t * @private\n\t * @param {module:engine/view/position~Position} viewPosition Position potentially next to text node.\n\t * @returns {module:engine/view/position~Position} Position in text node if possible.\n\t */\n\t_moveViewPositionToTextNode( viewPosition ) {\n\t\t// If the position is just after text node, put it at the end of that text node.\n\t\t// If the position is just before text node, put it at the beginning of that text node.\n\t\tconst nodeBefore = viewPosition.nodeBefore;\n\t\tconst nodeAfter = viewPosition.nodeAfter;\n\n\t\tif ( nodeBefore instanceof ViewText ) {\n\t\t\treturn new ViewPosition( nodeBefore, nodeBefore.data.length );\n\t\t} else if ( nodeAfter instanceof ViewText ) {\n\t\t\treturn new ViewPosition( nodeAfter, 0 );\n\t\t}\n\n\t\t// Otherwise, just return the given position.\n\t\treturn viewPosition;\n\t}\n\n\t/**\n\t * Fired for each model-to-view position mapping request. The purpose of this event is to enable custom model-to-view position\n\t * mapping. Callbacks added to this event take {@link module:engine/model/position~Position model position} and are expected to\n\t * calculate {@link module:engine/view/position~Position view position}. Calculated view position should be added as `viewPosition`\n\t * value in `data` object that is passed as one of parameters to the event callback.\n\t *\n\t * \t\t// Assume that \"captionedImage\" model element is converted to <img> and following <span> elements in view,\n\t * \t\t// and the model element is bound to <img> element. Force mapping model positions inside \"captionedImage\" to that\n\t * \t\t// <span> element.\n\t *\t\tmapper.on( 'modelToViewPosition', ( evt, data ) => {\n\t *\t\t\tconst positionParent = modelPosition.parent;\n\t *\n\t *\t\t\tif ( positionParent.name == 'captionedImage' ) {\n\t *\t\t\t\tconst viewImg = data.mapper.toViewElement( positionParent );\n\t *\t\t\t\tconst viewCaption = viewImg.nextSibling; // The <span> element.\n\t *\n\t *\t\t\t\tdata.viewPosition = new ViewPosition( viewCaption, modelPosition.offset );\n\t *\n\t *\t\t\t\t// Stop the event if other callbacks should not modify calculated value.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * **Note:** keep in mind that sometimes a \"phantom\" model position is being converted. \"Phantom\" model position is\n\t * a position that points to a non-existing place in model. Such position might still be valid for conversion, though\n\t * (it would point to a correct place in view when converted). One example of such situation is when a range is\n\t * removed from model, there may be a need to map the range's end (which is no longer valid model position). To\n\t * handle such situation, check `data.isPhantom` flag:\n\t *\n\t * \t\t// Assume that there is \"customElement\" model element and whenever position is before it, we want to move it\n\t * \t\t// to the inside of the view element bound to \"customElement\".\n\t *\t\tmapper.on( 'modelToViewPosition', ( evt, data ) => {\n\t *\t\t\tif ( data.isPhantom ) {\n\t *\t\t\t\treturn;\n\t *\t\t\t}\n\t *\n\t *\t\t\t// Below line might crash for phantom position that does not exist in model.\n\t *\t\t\tconst sibling = data.modelPosition.nodeBefore;\n\t *\n\t *\t\t\t// Check if this is the element we are interested in.\n\t *\t\t\tif ( !sibling.is( 'customElement' ) ) {\n\t *\t\t\t\treturn;\n\t *\t\t\t}\n\t *\n\t *\t\t\tconst viewElement = data.mapper.toViewElement( sibling );\n\t *\n\t *\t\t\tdata.viewPosition = new ViewPosition( sibling, 0 );\n\t *\n\t *\t\t\tevt.stop();\n\t *\t\t} );\n\t *\n\t * **Note:** default mapping callback is provided with `low` priority setting and does not cancel the event, so it is possible to\n\t * attach a custom callback after default callback and also use `data.viewPosition` calculated by default callback\n\t * (for example to fix it).\n\t *\n\t * **Note:** default mapping callback will not fire if `data.viewPosition` is already set.\n\t *\n\t * **Note:** these callbacks are called **very often**. For efficiency reasons, it is advised to use them only when position\n\t * mapping between given model and view elements is unsolvable using just elements mapping and default algorithm. Also,\n\t * the condition that checks if special case scenario happened should be as simple as possible.\n\t *\n\t * @event modelToViewPosition\n\t * @param {Object} data Data pipeline object that can store and pass data between callbacks. The callback should add\n\t * `viewPosition` value to that object with calculated {@link module:engine/view/position~Position view position}.\n\t * @param {module:engine/conversion/mapper~Mapper} data.mapper Mapper instance that fired the event.\n\t */\n\n\t/**\n\t * Fired for each view-to-model position mapping request. See {@link module:engine/conversion/mapper~Mapper#event:modelToViewPosition}.\n\t *\n\t * \t\t// See example in `modelToViewPosition` event description.\n\t * \t\t// This custom mapping will map positions from <span> element next to <img> to the \"captionedImage\" element.\n\t *\t\tmapper.on( 'viewToModelPosition', ( evt, data ) => {\n\t *\t\t\tconst positionParent = viewPosition.parent;\n\t *\n\t *\t\t\tif ( positionParent.hasClass( 'image-caption' ) ) {\n\t *\t\t\t\tconst viewImg = positionParent.previousSibling;\n\t *\t\t\t\tconst modelImg = data.mapper.toModelElement( viewImg );\n\t *\n\t *\t\t\t\tdata.modelPosition = new ModelPosition( modelImg, viewPosition.offset );\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * **Note:** default mapping callback is provided with `low` priority setting and does not cancel the event, so it is possible to\n\t * attach a custom callback after default callback and also use `data.modelPosition` calculated by default callback\n\t * (for example to fix it).\n\t *\n\t * **Note:** default mapping callback will not fire if `data.modelPosition` is already set.\n\t *\n\t * **Note:** these callbacks are called **very often**. For efficiency reasons, it is advised to use them only when position\n\t * mapping between given model and view elements is unsolvable using just elements mapping and default algorithm. Also,\n\t * the condition that checks if special case scenario happened should be as simple as possible.\n\t *\n\t * @event viewToModelPosition\n\t * @param {Object} data Data pipeline object that can store and pass data between callbacks. The callback should add\n\t * `modelPosition` value to that object with calculated {@link module:engine/model/position~Position model position}.\n\t * @param {module:engine/conversion/mapper~Mapper} data.mapper Mapper instance that fired the event.\n\t */\n}\n\nmix( Mapper, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/modelconsumable\n */\n\nimport TextProxy from '../model/textproxy';\n\n/**\n * Manages a list of consumable values for {@link module:engine/model/item~Item model items}.\n *\n * Consumables are various aspects of the model. A model item can be broken down into singular properties that might be\n * taken into consideration when converting that item.\n *\n * `ModelConsumable` is used by {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} while analyzing changed\n * parts of {@link module:engine/model/document~Document the document}. The added / changed / removed model items are broken down\n * into singular properties (the item itself and it's attributes). All those parts are saved in `ModelConsumable`. Then,\n * during conversion, when given part of model item is converted (i.e. the view element has been inserted into the view,\n * but without attributes), consumable value is removed from `ModelConsumable`.\n *\n * For model items, `ModelConsumable` stores consumable values of one of following types: `insert`, `addattribute:<attributeKey>`,\n * `changeattributes:<attributeKey>`, `removeattributes:<attributeKey>`.\n *\n * In most cases, it is enough to let {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}\n * gather consumable values, so there is no need to use\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#add add method} directly.\n * However, it is important to understand how consumable values can be\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed}.\n * See {@link module:engine/conversion/downcast-selection-converters default downcast converters} for more information.\n *\n * Keep in mind, that one conversion event may have multiple callbacks (converters) attached to it. Each of those is\n * able to convert one or more parts of the model. However, when one of those callbacks actually converts\n * something, other should not, because they would duplicate the results. Using `ModelConsumable` helps avoiding\n * this situation, because callbacks should only convert those values, which were not yet consumed from `ModelConsumable`.\n *\n * Consuming multiple values in a single callback:\n *\n *\t\t// Converter for custom `image` element that might have a `caption` element inside which changes\n *\t\t// how the image is displayed in the view:\n *\t\t//\n *\t\t// Model:\n *\t\t//\n *\t\t// [image]\n *\t\t//   └─ [caption]\n *\t\t//       └─ foo\n *\t\t//\n *\t\t// View:\n *\t\t//\n *\t\t// <figure>\n *\t\t//   ├─ <img />\n *\t\t//   └─ <caption>\n *\t\t//       └─ foo\n *\t\tmodelConversionDispatcher.on( 'insert:image', ( evt, data, conversionApi ) => {\n *\t\t\t// First, consume the `image` element.\n *\t\t\tconversionApi.consumable.consume( data.item, 'insert' );\n *\n *\t\t\t// Just create normal image element for the view.\n *\t\t\t// Maybe it will be \"decorated\" later.\n *\t\t\tconst viewImage = new ViewElement( 'img' );\n *\t\t\tconst insertPosition = conversionApi.mapper.toViewPosition( data.range.start );\n *\n *\t\t\t// Check if the `image` element has children.\n *\t\t\tif ( data.item.childCount > 0 ) {\n *\t\t\t\tconst modelCaption = data.item.getChild( 0 );\n *\n *\t\t\t\t// `modelCaption` insertion change is consumed from consumable values.\n *\t\t\t\t// It will not be converted by other converters, but it's children (probably some text) will be.\n *\t\t\t\t// Through mapping, converters for text will know where to insert contents of `modelCaption`.\n *\t\t\t\tif ( conversionApi.consumable.consume( modelCaption, 'insert' ) ) {\n *\t\t\t\t\tconst viewCaption = new ViewElement( 'figcaption' );\n *\n *\t\t\t\t\tconst viewImageHolder = new ViewElement( 'figure', null, [ viewImage, viewCaption ] );\n *\n *\t\t\t\t\tconversionApi.mapper.bindElements( modelCaption, viewCaption );\n *\t\t\t\t\tconversionApi.mapper.bindElements( data.item, viewImageHolder );\n *\t\t\t\t\tviewWriter.insert( insertPosition, viewImageHolder );\n *\t\t\t\t}\n *\t\t\t} else {\n *\t\t\t\tconversionApi.mapper.bindElements( data.item, viewImage );\n *\t\t\t\tviewWriter.insert( insertPosition, viewImage );\n *\t\t\t}\n *\n *\t\t\tevt.stop();\n *\t\t} );\n */\nexport default class ModelConsumable {\n\t/**\n\t * Creates an empty consumables list.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Contains list of consumable values.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/conversion/modelconsumable~ModelConsumable#_consumable\n\t\t */\n\t\tthis._consumable = new Map();\n\n\t\t/**\n\t\t * For each {@link module:engine/model/textproxy~TextProxy} added to `ModelConsumable`, this registry holds parent\n\t\t * of that `TextProxy` and start and end indices of that `TextProxy`. This allows identification of `TextProxy`\n\t\t * instances that points to the same part of the model but are different instances. Each distinct `TextProxy`\n\t\t * is given unique `Symbol` which is then registered as consumable. This process is transparent for `ModelConsumable`\n\t\t * API user because whenever `TextProxy` is added, tested, consumed or reverted, internal mechanisms of\n\t\t * `ModelConsumable` translates `TextProxy` to that unique `Symbol`.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/conversion/modelconsumable~ModelConsumable#_textProxyRegistry\n\t\t */\n\t\tthis._textProxyRegistry = new Map();\n\t}\n\n\t/**\n\t * Adds a consumable value to the consumables list and links it with given model item.\n\t *\n\t *\t\tmodelConsumable.add( modelElement, 'insert' ); // Add `modelElement` insertion change to consumable values.\n\t *\t\tmodelConsumable.add( modelElement, 'addAttribute:bold' ); // Add `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.add( modelElement, 'removeAttribute:bold' ); // Add `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.add( modelSelection, 'selection' ); // Add `modelSelection` to consumable values.\n\t *\t\tmodelConsumable.add( modelRange, 'range' ); // Add `modelRange` to consumable values.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection that has the consumable.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t */\n\tadd( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tif ( !this._consumable.has( item ) ) {\n\t\t\tthis._consumable.set( item, new Map() );\n\t\t}\n\n\t\tthis._consumable.get( item ).set( type, true );\n\t}\n\n\t/**\n\t * Removes given consumable value from given model item.\n\t *\n\t *\t\tmodelConsumable.consume( modelElement, 'insert' ); // Remove `modelElement` insertion change from consumable values.\n\t *\t\tmodelConsumable.consume( modelElement, 'addAttribute:bold' ); // Remove `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.consume( modelElement, 'removeAttribute:bold' ); // Remove `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.consume( modelSelection, 'selection' ); // Remove `modelSelection` from consumable values.\n\t *\t\tmodelConsumable.consume( modelRange, 'range' ); // Remove 'modelRange' from consumable values.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection from which consumable will be consumed.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t * @returns {Boolean} `true` if consumable value was available and was consumed, `false` otherwise.\n\t */\n\tconsume( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tif ( this.test( item, type ) ) {\n\t\t\tthis._consumable.get( item ).set( type, false );\n\n\t\t\treturn true;\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Tests whether there is a consumable value of given type connected with given model item.\n\t *\n\t *\t\tmodelConsumable.test( modelElement, 'insert' ); // Check for `modelElement` insertion change.\n\t *\t\tmodelConsumable.test( modelElement, 'addAttribute:bold' ); // Check for `bold` attribute insertion on `modelElement` change.\n\t *\t\tmodelConsumable.test( modelElement, 'removeAttribute:bold' ); // Check for `bold` attribute removal on `modelElement` change.\n\t *\t\tmodelConsumable.test( modelSelection, 'selection' ); // Check if `modelSelection` is consumable.\n\t *\t\tmodelConsumable.test( modelRange, 'range' ); // Check if `modelRange` is consumable.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection to be tested.\n\t * @param {String} type Consumable type. Will be normalized to a proper form, that is either `<word>` or `<part>:<part>`.\n\t * Second colon and everything after will be cut. Passing event name is a safe and good practice.\n\t * @returns {null|Boolean} `null` if such consumable was never added, `false` if the consumable values was\n\t * already consumed or `true` if it was added and not consumed yet.\n\t */\n\ttest( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tconst itemConsumables = this._consumable.get( item );\n\n\t\tif ( itemConsumables === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst value = itemConsumables.get( type );\n\n\t\tif ( value === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn value;\n\t}\n\n\t/**\n\t * Reverts consuming of consumable value.\n\t *\n\t *\t\tmodelConsumable.revert( modelElement, 'insert' ); // Revert consuming `modelElement` insertion change.\n\t *\t\tmodelConsumable.revert( modelElement, 'addAttribute:bold' ); // Revert consuming `bold` attribute insert from `modelElement`.\n\t *\t\tmodelConsumable.revert( modelElement, 'removeAttribute:bold' ); // Revert consuming `bold` attribute remove from `modelElement`.\n\t *\t\tmodelConsumable.revert( modelSelection, 'selection' ); // Revert consuming `modelSelection`.\n\t *\t\tmodelConsumable.revert( modelRange, 'range' ); // Revert consuming `modelRange`.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection|module:engine/model/range~Range} item\n\t * Model item, range or selection to be reverted.\n\t * @param {String} type Consumable type.\n\t * @returns {null|Boolean} `true` if consumable has been reversed, `false` otherwise. `null` if the consumable has\n\t * never been added.\n\t */\n\trevert( item, type ) {\n\t\ttype = _normalizeConsumableType( type );\n\n\t\tif ( item instanceof TextProxy ) {\n\t\t\titem = this._getSymbolForTextProxy( item );\n\t\t}\n\n\t\tconst test = this.test( item, type );\n\n\t\tif ( test === false ) {\n\t\t\tthis._consumable.get( item ).set( type, true );\n\n\t\t\treturn true;\n\t\t} else if ( test === true ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Gets a unique symbol for passed {@link module:engine/model/textproxy~TextProxy} instance. All `TextProxy` instances that\n\t * have same parent, same start index and same end index will get the same symbol.\n\t *\n\t * Used internally to correctly consume `TextProxy` instances.\n\t *\n\t * @private\n\t * @param {module:engine/model/textproxy~TextProxy} textProxy `TextProxy` instance to get a symbol for.\n\t * @returns {Symbol} Symbol representing all equal instances of `TextProxy`.\n\t */\n\t_getSymbolForTextProxy( textProxy ) {\n\t\tlet symbol = null;\n\n\t\tconst startMap = this._textProxyRegistry.get( textProxy.startOffset );\n\n\t\tif ( startMap ) {\n\t\t\tconst endMap = startMap.get( textProxy.endOffset );\n\n\t\t\tif ( endMap ) {\n\t\t\t\tsymbol = endMap.get( textProxy.parent );\n\t\t\t}\n\t\t}\n\n\t\tif ( !symbol ) {\n\t\t\tsymbol = this._addSymbolForTextProxy( textProxy.startOffset, textProxy.endOffset, textProxy.parent );\n\t\t}\n\n\t\treturn symbol;\n\t}\n\n\t/**\n\t * Adds a symbol for given properties that characterizes a {@link module:engine/model/textproxy~TextProxy} instance.\n\t *\n\t * Used internally to correctly consume `TextProxy` instances.\n\t *\n\t * @private\n\t * @param {Number} startIndex Text proxy start index in it's parent.\n\t * @param {Number} endIndex Text proxy end index in it's parent.\n\t * @param {module:engine/model/element~Element} parent Text proxy parent.\n\t * @returns {Symbol} Symbol generated for given properties.\n\t */\n\t_addSymbolForTextProxy( start, end, parent ) {\n\t\tconst symbol = Symbol( 'textProxySymbol' );\n\t\tlet startMap, endMap;\n\n\t\tstartMap = this._textProxyRegistry.get( start );\n\n\t\tif ( !startMap ) {\n\t\t\tstartMap = new Map();\n\t\t\tthis._textProxyRegistry.set( start, startMap );\n\t\t}\n\n\t\tendMap = startMap.get( end );\n\n\t\tif ( !endMap ) {\n\t\t\tendMap = new Map();\n\t\t\tstartMap.set( end, endMap );\n\t\t}\n\n\t\tendMap.set( parent, symbol );\n\n\t\treturn symbol;\n\t}\n}\n\n// Returns a normalized consumable type name from given string. A normalized consumable type name is a string that has\n// at most one colon, for example: `insert` or `addMarker:highlight`. If string to normalize has more \"parts\" (more colons),\n// the other parts are dropped, for example: `addattribute:bold:$text` -> `addattributes:bold`.\n//\n// @param {String} type Consumable type.\n// @returns {String} Normalized consumable type.\nfunction _normalizeConsumableType( type ) {\n\tconst parts = type.split( ':' );\n\n\treturn parts.length > 1 ? parts[ 0 ] + ':' + parts[ 1 ] : parts[ 0 ];\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/downcastdispatcher\n */\n\nimport Consumable from './modelconsumable';\nimport Range from '../model/range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport extend from '@ckeditor/ckeditor5-utils/src/lib/lodash/extend';\n\n/**\n * `DowncastDispatcher` is a central point of downcasting (conversion from model to view), which is a process of reacting to changes\n * in the model and firing a set of events. Callbacks listening to those events are called converters. Those\n * converters role is to convert the model changes to changes in view (for example, adding view nodes or\n * changing attributes on view elements).\n *\n * During conversion process, `DowncastDispatcher` fires events, basing on state of the model and prepares\n * data for those events. It is important to understand that those events are connected with changes done on model,\n * for example: \"node has been inserted\" or \"attribute has changed\". This is in a contrary to upcasting (view to model conversion),\n * where we convert view state (view nodes) to a model tree.\n *\n * The events are prepared basing on a diff created by {@link module:engine/model/differ~Differ Differ}, which buffers them\n * and then passes to `DowncastDispatcher` as a diff between old model state and new model state.\n *\n * Note, that because changes are converted there is a need to have a mapping between model structure and view structure.\n * To map positions and elements during downcast (model to view conversion) use {@link module:engine/conversion/mapper~Mapper}.\n *\n * `DowncastDispatcher` fires following events for model tree changes:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert insert}\n * if a range of nodes has been inserted to the model tree,\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:remove remove}\n * if a range of nodes has been removed from the model tree,\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute attribute}\n * if attribute has been added, changed or removed from a model node.\n *\n * For {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert insert}\n * and {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute attribute},\n * `DowncastDispatcher` generates {@link module:engine/conversion/modelconsumable~ModelConsumable consumables}.\n * These are used to have a control over which changes has been already consumed. It is useful when some converters\n * overwrite other or converts multiple changes (for example converts insertion of an element and also converts that\n * element's attributes during insertion).\n *\n * Additionally, `DowncastDispatcher` fires events for {@link module:engine/model/markercollection~Marker marker} changes:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker} if a marker has been added,\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:removeMarker} if a marker has been removed.\n *\n * Note, that changing a marker is done through removing the marker from the old range, and adding on the new range,\n * so both those events are fired.\n *\n * Finally, `DowncastDispatcher` also handles firing events for {@link module:engine/model/selection model selection}\n * conversion:\n *\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:selection}\n * which converts selection from model to view,\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute}\n * which is fired for every selection attribute,\n * * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}\n * which is fired for every marker which contains selection.\n *\n * Unlike model tree and markers, events for selection are not fired for changes but for selection state.\n *\n * When providing custom listeners for `DowncastDispatcher` remember to check whether given change has not been\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed} yet.\n *\n * When providing custom listeners for `DowncastDispatcher` keep in mind that any callback that had\n * {@link module:engine/conversion/modelconsumable~ModelConsumable#consume consumed} a value from a consumable and\n * converted the change should also stop the event (for efficiency purposes).\n *\n * When providing custom listeners for `DowncastDispatcher` remember to use provided\n * {@link module:engine/view/writer~Writer view writer} to apply changes to the view document.\n *\n * Example of a custom converter for `DowncastDispatcher`:\n *\n *\t\t// We will convert inserting \"paragraph\" model element into the model.\n *\t\tdowncastDispatcher.on( 'insert:paragraph', ( evt, data, conversionApi ) => {\n *\t\t\t// Remember to check whether the change has not been consumed yet and consume it.\n *\t\t\tif ( conversionApi.consumable.consume( data.item, 'insert' ) ) {\n *\t\t\t\treturn;\n *\t\t\t}\n *\n *\t\t\t// Translate position in model to position in view.\n *\t\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n *\n *\t\t\t// Create <p> element that will be inserted in view at `viewPosition`.\n *\t\t\tconst viewElement = conversionApi.writer.createContainerElement( 'p' );\n *\n *\t\t\t// Bind the newly created view element to model element so positions will map accordingly in future.\n *\t\t\tconversionApi.mapper.bindElements( data.item, viewElement );\n *\n *\t\t\t// Add the newly created view element to the view.\n *\t\t\tconversionApi.writer.insert( viewPosition, viewElement );\n *\n *\t\t\t// Remember to stop the event propagation.\n *\t\t\tevt.stop();\n *\t\t} );\n */\nexport default class DowncastDispatcher {\n\t/**\n\t * Creates a `DowncastDispatcher` instance.\n\t *\n\t * @param {Object} [conversionApi] Interface passed by dispatcher to the events calls.\n\t */\n\tconstructor( conversionApi = {} ) {\n\t\t/**\n\t\t * Interface passed by dispatcher to the events callbacks.\n\t\t *\n\t\t * @member {Object}\n\t\t */\n\t\tthis.conversionApi = extend( { dispatcher: this }, conversionApi );\n\t}\n\n\t/**\n\t * Takes {@link module:engine/model/differ~Differ model differ} object with buffered changes and fires conversion basing on it.\n\t *\n\t * @param {module:engine/model/differ~Differ} differ Differ object with buffered changes.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertChanges( differ, writer ) {\n\t\t// Before the view is updated, remove markers which have changed.\n\t\tfor ( const change of differ.getMarkersToRemove() ) {\n\t\t\tthis.convertMarkerRemove( change.name, change.range, writer );\n\t\t}\n\n\t\t// Convert changes that happened on model tree.\n\t\tfor ( const entry of differ.getChanges() ) {\n\t\t\tif ( entry.type == 'insert' ) {\n\t\t\t\tthis.convertInsert( Range.createFromPositionAndShift( entry.position, entry.length ), writer );\n\t\t\t} else if ( entry.type == 'remove' ) {\n\t\t\t\tthis.convertRemove( entry.position, entry.length, entry.name, writer );\n\t\t\t} else {\n\t\t\t\t// entry.type == 'attribute'.\n\t\t\t\tthis.convertAttribute( entry.range, entry.attributeKey, entry.attributeOldValue, entry.attributeNewValue, writer );\n\t\t\t}\n\t\t}\n\n\t\t// After the view is updated, convert markers which have changed.\n\t\tfor ( const change of differ.getMarkersToAdd() ) {\n\t\t\tthis.convertMarkerAdd( change.name, change.range, writer );\n\t\t}\n\t}\n\n\t/**\n\t * Starts conversion of a range insertion.\n\t *\n\t * For each node in the range, {@link #event:insert insert event is fired}. For each attribute on each node,\n\t * {@link #event:attribute attribute event is fired}.\n\t *\n\t * @fires insert\n\t * @fires attribute\n\t * @param {module:engine/model/range~Range} range Inserted range.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertInsert( range, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create a list of things that can be consumed, consisting of nodes and their attributes.\n\t\tthis.conversionApi.consumable = this._createInsertConsumable( range );\n\n\t\t// Fire a separate insert event for each node and text fragment contained in the range.\n\t\tfor ( const value of range ) {\n\t\t\tconst item = value.item;\n\t\t\tconst itemRange = Range.createFromPositionAndShift( value.previousPosition, value.length );\n\t\t\tconst data = {\n\t\t\t\titem,\n\t\t\t\trange: itemRange\n\t\t\t};\n\n\t\t\tthis._testAndFire( 'insert', data );\n\n\t\t\t// Fire a separate addAttribute event for each attribute that was set on inserted items.\n\t\t\t// This is important because most attributes converters will listen only to add/change/removeAttribute events.\n\t\t\t// If we would not add this part, attributes on inserted nodes would not be converted.\n\t\t\tfor ( const key of item.getAttributeKeys() ) {\n\t\t\t\tdata.attributeKey = key;\n\t\t\t\tdata.attributeOldValue = null;\n\t\t\t\tdata.attributeNewValue = item.getAttribute( key );\n\n\t\t\t\tthis._testAndFire( `attribute:${ key }`, data );\n\t\t\t}\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Fires conversion of a single node removal. Fires {@link #event:remove remove event} with provided data.\n\t *\n\t * @param {module:engine/model/position~Position} position Position from which node was removed.\n\t * @param {Number} length Offset size of removed node.\n\t * @param {String} name Name of removed node.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertRemove( position, length, name, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\tthis.fire( 'remove:' + name, { position, length }, this.conversionApi );\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Starts conversion of attribute change on given `range`.\n\t *\n\t * For each node in the given `range`, {@link #event:attribute attribute event} is fired with the passed data.\n\t *\n\t * @fires attribute\n\t * @param {module:engine/model/range~Range} range Changed range.\n\t * @param {String} key Key of the attribute that has changed.\n\t * @param {*} oldValue Attribute value before the change or `null` if the attribute has not been set before.\n\t * @param {*} newValue New attribute value or `null` if the attribute has been removed.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertAttribute( range, key, oldValue, newValue, writer ) {\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create a list with attributes to consume.\n\t\tthis.conversionApi.consumable = this._createConsumableForRange( range, `attribute:${ key }` );\n\n\t\t// Create a separate attribute event for each node in the range.\n\t\tfor ( const value of range ) {\n\t\t\tconst item = value.item;\n\t\t\tconst itemRange = Range.createFromPositionAndShift( value.previousPosition, value.length );\n\t\t\tconst data = {\n\t\t\t\titem,\n\t\t\t\trange: itemRange,\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: oldValue,\n\t\t\t\tattributeNewValue: newValue\n\t\t\t};\n\n\t\t\tthis._testAndFire( `attribute:${ key }`, data );\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Starts model selection conversion.\n\t *\n\t * Fires events for given {@link module:engine/model/selection~Selection selection} to start selection conversion.\n\t *\n\t * @fires selection\n\t * @fires addMarker\n\t * @fires attribute\n\t * @param {module:engine/model/selection~Selection} selection Selection to convert.\n\t * @param {Array.<module:engine/model/markercollection~Marker>} markers Array of markers containing model markers.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertSelection( selection, markers, writer ) {\n\t\tconst markersAtSelection = Array.from( markers.getMarkersAtPosition( selection.getFirstPosition() ) );\n\n\t\tthis.conversionApi.writer = writer;\n\t\tthis.conversionApi.consumable = this._createSelectionConsumable( selection, markersAtSelection );\n\n\t\tthis.fire( 'selection', { selection }, this.conversionApi );\n\n\t\tif ( !selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const marker of markersAtSelection ) {\n\t\t\tconst markerRange = marker.getRange();\n\n\t\t\tif ( !shouldMarkerChangeBeConverted( selection.getFirstPosition(), marker, this.conversionApi.mapper ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst data = {\n\t\t\t\titem: selection,\n\t\t\t\tmarkerName: marker.name,\n\t\t\t\tmarkerRange\n\t\t\t};\n\n\t\t\tif ( this.conversionApi.consumable.test( selection, 'addMarker:' + marker.name ) ) {\n\t\t\t\tthis.fire( 'addMarker:' + marker.name, data, this.conversionApi );\n\t\t\t}\n\t\t}\n\n\t\tfor ( const key of selection.getAttributeKeys() ) {\n\t\t\tconst data = {\n\t\t\t\titem: selection,\n\t\t\t\trange: selection.getFirstRange(),\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: null,\n\t\t\t\tattributeNewValue: selection.getAttribute( key )\n\t\t\t};\n\n\t\t\t// Do not fire event if the attribute has been consumed.\n\t\t\tif ( this.conversionApi.consumable.test( selection, 'attribute:' + data.attributeKey ) ) {\n\t\t\t\tthis.fire( 'attribute:' + data.attributeKey, data, this.conversionApi );\n\t\t\t}\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Converts added marker. Fires {@link #event:addMarker addMarker} event for each item\n\t * in marker's range. If range is collapsed single event is dispatched. See event description for more details.\n\t *\n\t * @fires addMarker\n\t * @param {String} markerName Marker name.\n\t * @param {module:engine/model/range~Range} markerRange Marker range.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertMarkerAdd( markerName, markerRange, writer ) {\n\t\t// Do not convert if range is in graveyard or not in the document (e.g. in DocumentFragment).\n\t\tif ( !markerRange.root.document || markerRange.root.rootName == '$graveyard' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// In markers' case, event name == consumable name.\n\t\tconst eventName = 'addMarker:' + markerName;\n\n\t\t// When range is collapsed - fire single event with collapsed range in consumable.\n\t\tif ( markerRange.isCollapsed ) {\n\t\t\tconst consumable = new Consumable();\n\t\t\tconsumable.add( markerRange, eventName );\n\n\t\t\tthis.conversionApi.consumable = consumable;\n\n\t\t\tthis.fire( eventName, { markerName, markerRange }, this.conversionApi );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Create consumable for each item in range.\n\t\tthis.conversionApi.consumable = this._createConsumableForRange( markerRange, eventName );\n\n\t\t// Create separate event for each node in the range.\n\t\tfor ( const item of markerRange.getItems() ) {\n\t\t\t// Do not fire event for already consumed items.\n\t\t\tif ( !this.conversionApi.consumable.test( item, eventName ) ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconst data = { item, range: Range.createOn( item ), markerName, markerRange };\n\n\t\t\tthis.fire( eventName, data, this.conversionApi );\n\t\t}\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Fires conversion of marker removal. Fires {@link #event:removeMarker removeMarker} event with provided data.\n\t *\n\t * @fires removeMarker\n\t * @param {String} markerName Marker name.\n\t * @param {module:engine/model/range~Range} markerRange Marker range.\n\t * @param {module:engine/view/writer~Writer} writer View writer that should be used to modify view document.\n\t */\n\tconvertMarkerRemove( markerName, markerRange, writer ) {\n\t\t// Do not convert if range is in graveyard or not in the document (e.g. in DocumentFragment).\n\t\tif ( !markerRange.root.document || markerRange.root.rootName == '$graveyard' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis.conversionApi.writer = writer;\n\n\t\tthis.fire( 'removeMarker:' + markerName, { markerName, markerRange }, this.conversionApi );\n\n\t\tthis._clearConversionApi();\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with values to consume from given range,\n\t * assuming that the range has just been inserted to the model.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range Inserted range.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} Values to consume.\n\t */\n\t_createInsertConsumable( range ) {\n\t\tconst consumable = new Consumable();\n\n\t\tfor ( const value of range ) {\n\t\t\tconst item = value.item;\n\n\t\t\tconsumable.add( item, 'insert' );\n\n\t\t\tfor ( const key of item.getAttributeKeys() ) {\n\t\t\t\tconsumable.add( item, 'attribute:' + key );\n\t\t\t}\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with values to consume for given range.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range Affected range.\n\t * @param {String} type Consumable type.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} Values to consume.\n\t */\n\t_createConsumableForRange( range, type ) {\n\t\tconst consumable = new Consumable();\n\n\t\tfor ( const item of range.getItems() ) {\n\t\t\tconsumable.add( item, type );\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/modelconsumable~ModelConsumable} with selection consumable values.\n\t *\n\t * @private\n\t * @param {module:engine/model/selection~Selection} selection Selection to create consumable from.\n\t * @param {Iterable.<module:engine/model/markercollection~Marker>} markers Markers which contains selection.\n\t * @returns {module:engine/conversion/modelconsumable~ModelConsumable} Values to consume.\n\t */\n\t_createSelectionConsumable( selection, markers ) {\n\t\tconst consumable = new Consumable();\n\n\t\tconsumable.add( selection, 'selection' );\n\n\t\tfor ( const marker of markers ) {\n\t\t\tconsumable.add( selection, 'addMarker:' + marker.name );\n\t\t}\n\n\t\tfor ( const key of selection.getAttributeKeys() ) {\n\t\t\tconsumable.add( selection, 'attribute:' + key );\n\t\t}\n\n\t\treturn consumable;\n\t}\n\n\t/**\n\t * Tests passed `consumable` to check whether given event can be fired and if so, fires it.\n\t *\n\t * @private\n\t * @fires insert\n\t * @fires attribute\n\t * @param {String} type Event type.\n\t * @param {Object} data Event data.\n\t */\n\t_testAndFire( type, data ) {\n\t\tif ( !this.conversionApi.consumable.test( data.item, type ) ) {\n\t\t\t// Do not fire event if the item was consumed.\n\t\t\treturn;\n\t\t}\n\n\t\tconst name = data.item.name || '$text';\n\n\t\tthis.fire( type + ':' + name, data, this.conversionApi );\n\t}\n\n\t/**\n\t * Clears conversion API object.\n\t *\n\t * @private\n\t */\n\t_clearConversionApi() {\n\t\tdelete this.conversionApi.writer;\n\t\tdelete this.conversionApi.consumable;\n\t}\n\n\t/**\n\t * Fired for inserted nodes.\n\t *\n\t * `insert` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `insert:name`. `name` is either `'$text'`, when {@link module:engine/model/text~Text a text node} has been inserted,\n\t * or {@link module:engine/model/element~Element#name name} of inserted element.\n\t *\n\t * This way listeners can either listen to a general `insert` event or specific event (for example `insert:paragraph`).\n\t *\n\t * @event insert\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item} data.item Inserted item.\n\t * @param {module:engine/model/range~Range} data.range Range spanning over inserted item.\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired for removed nodes.\n\t *\n\t * `remove` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `remove:name`. `name` is either `'$text'`, when {@link module:engine/model/text~Text a text node} has been removed,\n\t * or the {@link module:engine/model/element~Element#name name} of removed element.\n\t *\n\t * This way listeners can either listen to a general `remove` event or specific event (for example `remove:paragraph`).\n\t *\n\t * @event remove\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/position~Position} data.sourcePosition Position from where the range has been removed.\n\t * @param {module:engine/model/range~Range} data.range Removed range (in {@link module:engine/model/document~Document#graveyard\n\t * graveyard root}).\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired when attribute has been added/changed/removed from a node. Also fired when collapsed model selection attribute is converted.\n\t *\n\t * `attribute` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `attribute:attributeKey:name`. `attributeKey` is the key of added/changed/removed attribute.\n\t * `name` is either `'$text'` if change was on {@link module:engine/model/text~Text a text node},\n\t * or the {@link module:engine/model/element~Element#name name} of element which attribute has changed.\n\t *\n\t * This way listeners can either listen to a general `attribute:bold` event or specific event (for example `attribute:src:image`).\n\t *\n\t * @event attribute\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item|module:engine/model/documentselection~DocumentSelection} data.item Changed item\n\t * or converted selection.\n\t * @param {module:engine/model/range~Range} data.range Range spanning over changed item or selection range.\n\t * @param {String} data.attributeKey Attribute key.\n\t * @param {*} data.attributeOldValue Attribute value before the change. This is `null` when selection attribute is converted.\n\t * @param {*} data.attributeNewValue New attribute value.\n\t * @param {module:engine/conversion/modelconsumable~ModelConsumable} consumable Values to consume.\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired for {@link module:engine/model/selection~Selection selection} changes.\n\t *\n\t * @event selection\n\t * @param {module:engine/model/selection~Selection} selection Selection that is converted.\n\t * @param {module:engine/conversion/modelconsumable~ModelConsumable} consumable Values to consume.\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired when a new marker is added to the model. Also fired when collapsed model selection that is inside marker is converted.\n\t *\n\t * `addMarker` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `addMarker:markerName`. By specifying certain marker names, you can make the events even more gradual. For example,\n\t * if markers are named `foo:abc`, `foo:bar`, then it is possible to listen to `addMarker:foo` or `addMarker:foo:abc` and\n\t * `addMarker:foo:bar` events.\n\t *\n\t * If the marker range is not collapsed:\n\t *\n\t * * the event is fired for each item in the marker range one by one,\n\t * * consumables object includes each item of the marker range and the consumable value is same as event name.\n\t *\n\t * If the marker range is collapsed:\n\t *\n\t * * there is only one event,\n\t * * consumables object includes marker range with event name.\n\t *\n\t * If selection inside a marker is converted:\n\t *\n\t * * there is only one event,\n\t * * consumables object includes selection instance with event name.\n\t *\n\t * @event addMarker\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/item~Item|module:engine/model/selection~Selection} data.item Item inside the new marker or\n\t * the selection that is being converted.\n\t * @param {module:engine/model/range~Range} [data.range] Range spanning over converted item. Available only in marker conversion, if\n\t * the marker range was not collapsed.\n\t * @param {module:engine/model/range~Range} data.markerRange Marker range.\n\t * @param {String} data.markerName Marker name.\n\t * @param {module:engine/conversion/modelconsumable~ModelConsumable} consumable Values to consume.\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n\n\t/**\n\t * Fired when marker is removed from the model.\n\t *\n\t * `removeMarker` is a namespace for a class of events. Names of actually called events follow this pattern:\n\t * `removeMarker:markerName`. By specifying certain marker names, you can make the events even more gradual. For example,\n\t * if markers are named `foo:abc`, `foo:bar`, then it is possible to listen to `removeMarker:foo` or `removeMarker:foo:abc` and\n\t * `removeMarker:foo:bar` events.\n\t *\n\t * @event removeMarker\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/model/range~Range} data.markerRange Marker range.\n\t * @param {String} data.markerName Marker name.\n\t * @param {Object} conversionApi Conversion interface to be used by callback, passed in `DowncastDispatcher` constructor.\n\t */\n}\n\nmix( DowncastDispatcher, EmitterMixin );\n\n// Helper function, checks whether change of `marker` at `modelPosition` should be converted. Marker changes are not\n// converted if they happen inside an element with custom conversion method.\n//\n// @param {module:engine/model/position~Position} modelPosition\n// @param {module:engine/model/markercollection~Marker} marker\n// @param {module:engine/conversion/mapper~Mapper} mapper\n// @returns {Boolean}\nfunction shouldMarkerChangeBeConverted( modelPosition, marker, mapper ) {\n\tconst range = marker.getRange();\n\tconst ancestors = Array.from( modelPosition.getAncestors() );\n\tancestors.shift(); // Remove root element. It cannot be passed to `model.Range#containsItem`.\n\tancestors.reverse();\n\n\tconst hasCustomHandling = ancestors.some( element => {\n\t\tif ( range.containsItem( element ) ) {\n\t\t\tconst viewElement = mapper.toViewElement( element );\n\n\t\t\treturn !!viewElement.getCustomProperty( 'addHighlight' );\n\t\t}\n\t} );\n\n\treturn !hasCustomHandling;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/selection\n */\n\nimport Position from './position';\nimport Element from './element';\nimport Node from './node';\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n/**\n * `Selection` is a group of {@link module:engine/model/range~Range ranges} which has a direction specified by\n * {@link module:engine/model/selection~Selection#anchor anchor} and {@link module:engine/model/selection~Selection#focus focus}.\n * Additionally, `Selection` may have it's own attributes.\n *\n * @mixes {module:utils/emittermixin~EmitterMixin}\n */\nexport default class Selection {\n\t/**\n\t * Creates new selection instance on the given\n\t * {@link module:engine/model/selection~Selection selection}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/element~Element element}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/range~Range range}, an iterable of {@link module:engine/model/range~Range ranges}\n\t * or creates an empty selection if no arguments passed.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new Selection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tconst selection = new Selection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tconst selection = new Selection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tconst selection = new Selection( otherSelection );\n\t *\n\t * \t\t// Creates selection from the given document selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst documentSelection = new DocumentSelection( doc );\n\t *\t\tconst selection = new Selection( documentSelection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tconst selection = new Selection( position );\n\t *\n\t * \t\t// Creates selection at the start position of the given element.\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\tconst selection = new Selection( paragraph, offset );\n\t *\n\t * \t\t// Creates a range inside an {@link module:engine/model/element~Element element} which starts before the\n\t * \t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new Selection( paragraph, 'in' );\n\t *\n\t * \t\t// Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends\n\t * \t\t// just after the item.\n\t *\t\tconst selection = new Selection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`) as the last argument.\n\t *\n\t * \t\t// Creates backward selection.\n\t *\t\tconst selection = new Selection( range, { backward: true } );\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/position~Position|module:engine/model/element~Element|\n\t * Iterable.<module:engine/model/range~Range>|module:engine/model/range~Range|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tconstructor( selectable, placeOrOffset, options ) {\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @private\n\t\t * @type {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Stores selection ranges.\n\t\t *\n\t\t * @protected\n\t\t * @type {Array.<module:engine/model/range~Range>}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * List of attributes set on current selection.\n\t\t *\n\t\t * @protected\n\t\t * @type {Map.<String,*>}\n\t\t */\n\t\tthis._attrs = new Map();\n\n\t\tif ( selectable ) {\n\t\t\tthis.setTo( selectable, placeOrOffset, options );\n\t\t}\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the most recent part of the selection starts.\n\t * Together with {@link #focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always {@link module:engine/model/range~Range#start start} or\n\t * {@link module:engine/model/range~Range#end end} position of the most recently added range.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #focus\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget anchor() {\n\t\tif ( this._ranges.length > 0 ) {\n\t\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\n\t\t\treturn this._lastRangeBackward ? range.end : range.start;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #anchor\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget focus() {\n\t\tif ( this._ranges.length > 0 ) {\n\t\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\n\t\t\treturn this._lastRangeBackward ? range.start : range.end;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\tconst length = this._ranges.length;\n\n\t\tif ( length === 1 ) {\n\t\t\treturn this._ranges[ 0 ].isCollapsed;\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus}\n\t * precedes {@link #anchor}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * Checks whether this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns an iterable that iterates over copies of selection ranges.\n\t *\n\t * @returns {Iterable.<module:engine/model/range~Range>}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield Range.createFromRange( range );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a copy of the first range in the selection.\n\t * First range is the one which {@link module:engine/model/range~Range#start start} position\n\t * {@link module:engine/model/position~Position#isBefore is before} start position of all other ranges\n\t * (not to confuse with the first range added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? Range.createFromRange( first ) : null;\n\t}\n\n\t/**\n\t * Returns a copy of the last range in the selection.\n\t * Last range is the one which {@link module:engine/model/range~Range#end end} position\n\t * {@link module:engine/model/position~Position#isAfter is after} end position of all other ranges (not to confuse with the range most\n\t * recently added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? Range.createFromRange( last ) : null;\n\t}\n\n\t/**\n\t * Returns the first position in the selection.\n\t * First position is the position that {@link module:engine/model/position~Position#isBefore is before}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst first = this.getFirstRange();\n\n\t\treturn first ? Position.createFromPosition( first.start ) : null;\n\t}\n\n\t/**\n\t * Returns the last position in the selection.\n\t * Last position is the position that {@link module:engine/model/position~Position#isAfter is after}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? Position.createFromPosition( lastRange.end ) : null;\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/model/selection~Selection selection}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/element~Element element}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/range~Range range}, an iterable of {@link module:engine/model/range~Range ranges} or null.\n\t *\n\t * \t\t// Removes all selection's ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tselection.setTo( ranges );\n\t *\n\t *\t\t// Sets selection to other selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t * \t\t// Sets selection to the given document selection.\n\t *\t\t// Note: It doesn't copies selection attributes.\n\t *\t\tconst documentSelection = new DocumentSelection( doc );\n\t *\t\tselection.setTo( documentSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of the given node and an offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * `Selection#setTo()`' method allow passing additional options (`backward`) as the last argument.\n\t *\n\t * \t\t// Sets backward selection.\n\t *\t\tconst selection = new Selection( range, { backward: true } );\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/position~Position|module:engine/model/node~Node|\n\t * Iterable.<module:engine/model/range~Range>|module:engine/model/range~Range|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t} else if ( selectable instanceof Selection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t} else if ( selectable && typeof selectable.getRanges == 'function' ) {\n\t\t\t// We assume that the selectable is a DocumentSelection.\n\t\t\t// It can't be imported here, because it would lead to circular imports.\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], !!placeOrOffset && !!placeOrOffset.backward );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range.createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range.createOn( selectable );\n\t\t\t} else if ( placeOrOffset !== undefined ) {\n\t\t\t\trange = Range.createCollapsedAt( selectable, placeOrOffset );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error model-selection-setTo-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-selection-setTo-required-second-parameter: ' +\n\t\t\t\t\t'selection.setTo requires the second parameter when the first parameter is a node.' );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\tthis._setRanges( selectable, placeOrOffset && !!placeOrOffset.backward );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set selection to given place.\n\t\t\t *\n\t\t\t * @error model-selection-setTo-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-selection-setTo-not-selectable: Cannot set selection to given place.' );\n\t\t}\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link module:engine/model/selection~Selection#anchor} and\n\t * {@link module:engine/model/selection~Selection#focus}. Accepts a flag describing in which direction the selection is made.\n\t *\n\t * @protected\n\t * @fires change:range\n\t * @param {Iterable.<module:engine/model/range~Range>} newRanges Ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end (`false`)\n\t * or backward - from end to start (`true`).\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\tnewRanges = Array.from( newRanges );\n\n\t\t// Check whether there is any range in new ranges set that is different than all already added ranges.\n\t\tconst anyNewRange = newRanges.some( newRange => {\n\t\t\tif ( !( newRange instanceof Range ) ) {\n\t\t\t\tthrow new CKEditorError( 'model-selection-added-not-range: Trying to add an object that is not an instance of Range.' );\n\t\t\t}\n\n\t\t\treturn this._ranges.every( oldRange => {\n\t\t\t\treturn !oldRange.isEqual( newRange );\n\t\t\t} );\n\t\t} );\n\n\t\t// Don't do anything if nothing changed.\n\t\tif ( newRanges.length === this._ranges.length && !anyNewRange ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._removeAllRanges();\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._pushRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\n\t\tthis.fire( 'change:range', { directChange: true } );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/selection~Selection#focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/model/position~Position.createAt} parameters.\n\t *\n\t * @fires change:range\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error model-selection-setFocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.'\n\t\t\t);\n\t\t}\n\n\t\tconst newFocus = Position.createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tif ( this._ranges.length ) {\n\t\t\tthis._popRange();\n\t\t}\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._pushRange( new Range( newFocus, anchor ) );\n\t\t\tthis._lastRangeBackward = true;\n\t\t} else {\n\t\t\tthis._pushRange( new Range( anchor, newFocus ) );\n\t\t\tthis._lastRangeBackward = false;\n\t\t}\n\n\t\tthis.fire( 'change:range', { directChange: true } );\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on the selection.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._attrs.entries();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._attrs.keys();\n\t}\n\n\t/**\n\t * Checks if the selection has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on selection, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the selection.\n\t *\n\t * If given attribute was set on the selection, fires the {@link #event:change:range} event with\n\t * removed attribute key.\n\t *\n\t * @fires change:attribute\n\t * @param {String} key Key of attribute to remove.\n\t */\n\tremoveAttribute( key ) {\n\t\tif ( this.hasAttribute( key ) ) {\n\t\t\tthis._attrs.delete( key );\n\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: [ key ], directChange: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Sets attribute on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * If the attribute value has changed, fires the {@link #event:change:range} event with\n\t * the attribute key.\n\t *\n\t * @fires change:attribute\n\t * @param {String} key Key of attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\tsetAttribute( key, value ) {\n\t\tif ( this.getAttribute( key ) !== value ) {\n\t\t\tthis._attrs.set( key, value );\n\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: [ key ], directChange: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/model/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = this.getFirstRange();\n\t\tconst nodeAfterStart = range.start.nodeAfter;\n\t\tconst nodeBeforeEnd = range.end.nodeBefore;\n\n\t\treturn ( nodeAfterStart instanceof Element && nodeAfterStart == nodeBeforeEnd ) ? nodeAfterStart : null;\n\t}\n\n\t/**\n\t * Gets elements of type \"block\" touched by the selection.\n\t *\n\t * This method's result can be used for example to apply block styling to all blocks covered by this selection.\n\t *\n\t * **Note:** `getSelectedBlocks()` always returns the deepest block.\n\t *\n\t * In this case the function will return exactly all 3 paragraphs:\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<quote>\n\t *\t\t\t<paragraph>b</paragraph>\n\t *\t\t</quote>\n\t *\t\t<paragraph>c]d</paragraph>\n\t *\n\t * In this case the paragraph will also be returned, despite the collapsed selection:\n\t *\n\t *\t\t<paragraph>[]a</paragraph>\n\t *\n\t * **Special case**: If a selection ends at the beginning of a block, that block is not returned as from user perspective\n\t * this block wasn't selected. See [#984](https://github.com/ckeditor/ckeditor5-engine/issues/984) for more details.\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<paragraph>b</paragraph>\n\t *\t\t<paragraph>]c</paragraph> // this block will not be returned\n\t *\n\t * @returns {Iterable.<module:engine/model/element~Element>}\n\t */\n\t* getSelectedBlocks() {\n\t\tconst visited = new WeakSet();\n\n\t\tfor ( const range of this.getRanges() ) {\n\t\t\tconst startBlock = getParentBlock( range.start, visited );\n\n\t\t\tif ( startBlock ) {\n\t\t\t\tyield startBlock;\n\t\t\t}\n\n\t\t\tfor ( const value of range.getWalker() ) {\n\t\t\t\tif ( value.type == 'elementEnd' && isUnvisitedBlockContainer( value.item, visited ) ) {\n\t\t\t\t\tyield value.item;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst endBlock = getParentBlock( range.end, visited );\n\n\t\t\t// #984. Don't return the end block if the range ends right at its beginning.\n\t\t\tif ( endBlock && !range.end.isTouching( Position.createAt( endBlock ) ) ) {\n\t\t\t\tyield endBlock;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Checks whether the selection contains the entire content of the given element. This means that selection must start\n\t * at a position {@link module:engine/model/position~Position#isTouching touching} the element's start and ends at position\n\t * touching the element's end.\n\t *\n\t * By default, this method will check whether the entire content of the selection's current root is selected.\n\t * Useful to check if e.g. the user has just pressed <kbd>Ctrl</kbd> + <kbd>A</kbd>.\n\t *\n\t * @param {module:engine/model/element~Element} [element=this.anchor.root]\n\t * @returns {Boolean}\n\t */\n\tcontainsEntireContent( element = this.anchor.root ) {\n\t\tconst limitStartPosition = Position.createAt( element );\n\t\tconst limitEndPosition = Position.createAt( element, 'end' );\n\n\t\treturn limitStartPosition.isTouching( this.getFirstPosition() ) &&\n\t\t\tlimitEndPosition.isTouching( this.getLastPosition() );\n\t}\n\n\t/**\n\t * Adds given range to internal {@link #_ranges ranges array}. Throws an error\n\t * if given range is intersecting with any range that is already stored in this selection.\n\t *\n\t * @protected\n\t * @param {module:engine/model/range~Range} range Range to add.\n\t */\n\t_pushRange( range ) {\n\t\tthis._checkRange( range );\n\t\tthis._ranges.push( Range.createFromRange( range ) );\n\t}\n\n\t/**\n\t * Checks if given range intersects with ranges that are already in the selection. Throws an error if it does.\n\t *\n\t * @protected\n\t * @param {module:engine/model/range~Range} range Range to check.\n\t */\n\t_checkRange( range ) {\n\t\tfor ( let i = 0; i < this._ranges.length; i++ ) {\n\t\t\tif ( range.isIntersecting( this._ranges[ i ] ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range from selection.\n\t\t\t\t *\n\t\t\t\t * @error model-selection-range-intersects\n\t\t\t\t * @param {module:engine/model/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/model/range~Range} intersectingRange Range from selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-selection-range-intersects: Trying to add a range that intersects with another range from selection.',\n\t\t\t\t\t{ addedRange: range, intersectingRange: this._ranges[ i ] }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Deletes ranges from internal range array. Uses {@link #_popRange _popRange} to\n\t * ensure proper ranges removal.\n\t *\n\t * @protected\n\t */\n\t_removeAllRanges() {\n\t\twhile ( this._ranges.length > 0 ) {\n\t\t\tthis._popRange();\n\t\t}\n\t}\n\n\t/**\n\t * Removes most recently added range from the selection.\n\t *\n\t * @protected\n\t */\n\t_popRange() {\n\t\tthis._ranges.pop();\n\t}\n\n\t/**\n\t * Fired when selection range(s) changed.\n\t *\n\t * @event change:range\n\t * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n\t * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n\t * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its position\n\t * was directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n\t * changed because the structure of the model has been changed (which means an indirect change).\n\t * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n\t * which mean that they are not updated once the document changes.\n\t */\n\n\t/**\n\t * Fired when selection attribute changed.\n\t *\n\t * @event change:attribute\n\t * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n\t * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n\t * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its attributes\n\t * were directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n\t * changed in the model and its attributes were refreshed (which means an indirect change).\n\t * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n\t * which mean that they are not updated once the document changes.\n\t * @param {Array.<String>} attributeKeys Array containing keys of attributes that changed.\n\t */\n}\n\nmix( Selection, EmitterMixin );\n\n// Checks whether the given element extends $block in the schema and has a parent (is not a root).\n// Marks it as already visited.\nfunction isUnvisitedBlockContainer( element, visited ) {\n\tif ( visited.has( element ) ) {\n\t\treturn false;\n\t}\n\n\tvisited.add( element );\n\n\treturn element.document.model.schema.isBlock( element ) && element.parent;\n}\n\n// Finds the lowest element in position's ancestors which is a block.\n// Marks all ancestors as already visited to not include any of them later on.\nfunction getParentBlock( position, visited ) {\n\tconst ancestors = position.parent.getAncestors( { parentFirst: true, includeSelf: true } );\n\tconst block = ancestors.find( element => isUnvisitedBlockContainer( element, visited ) );\n\n\t// Mark all ancestors of this position's parent, because find() might've stopped early and\n\t// the found block may be a child of another block.\n\tancestors.forEach( element => visited.add( element ) );\n\n\treturn block;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/liverange\n */\n\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * `LiveRange` is a type of {@link module:engine/model/range~Range Range}\n * that updates itself as {@link module:engine/model/document~Document document}\n * is changed through operations. It may be used as a bookmark.\n *\n * **Note:** Be very careful when dealing with `LiveRange`. Each `LiveRange` instance bind events that might\n * have to be unbound. Use {@link module:engine/model/liverange~LiveRange#detach detach} whenever you don't need `LiveRange` anymore.\n */\nexport default class LiveRange extends Range {\n\t/**\n\t * Creates a live range.\n\t *\n\t * @see module:engine/model/range~Range\n\t */\n\tconstructor( start, end ) {\n\t\tsuper( start, end );\n\n\t\tbindWithDocument.call( this );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by `LiveRange`. Use it whenever you don't need `LiveRange` instance\n\t * anymore (i.e. when leaving scope in which it was declared or before re-assigning variable that was\n\t * referring to it).\n\t */\n\tdetach() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * @see module:engine/model/range~Range.createIn\n\t * @static\n\t * @method module:engine/model/liverange~LiveRange.createIn\n\t * @param {module:engine/model/element~Element} element\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * @see module:engine/model/range~Range.createFromPositionAndShift\n\t * @static\n\t * @method module:engine/model/liverange~LiveRange.createFromPositionAndShift\n\t * @param {module:engine/model/position~Position} position\n\t * @param {Number} shift\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * @see module:engine/model/range~Range.createFromParentsAndOffsets\n\t * @static\n\t * @method module:engine/model/liverange~LiveRange.createFromParentsAndOffsets\n\t * @param {module:engine/model/element~Element} startElement\n\t * @param {Number} startOffset\n\t * @param {module:engine/model/element~Element} endElement\n\t * @param {Number} endOffset\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * @see module:engine/model/range~Range.createFromRange\n\t * @static\n\t * @method module:engine/model/liverange~LiveRange.createFromRange\n\t * @param {module:engine/model/range~Range} range\n\t * @returns {module:engine/model/liverange~LiveRange}\n\t */\n\n\t/**\n\t * Fired when `LiveRange` instance boundaries have changed due to changes in the\n\t * {@link module:engine/model/document~Document document}.\n\t *\n\t * @event change:range\n\t * @param {module:engine/model/range~Range} oldRange Range with start and end position equal to start and end position of this live\n\t * range before it got changed.\n\t * @param {Object} data Object with additional information about the change. Those parameters are passed from\n\t * {@link module:engine/model/document~Document#event:change document change event}.\n\t * @param {String} data.type Change type.\n\t * @param {module:engine/model/batch~Batch} data.batch Batch which changed the live range.\n\t * @param {module:engine/model/range~Range} data.range Range containing the result of applied change.\n\t * @param {module:engine/model/position~Position} data.sourcePosition Source position for move, remove and reinsert change types.\n\t */\n\n\t/**\n\t * Fired when `LiveRange` instance boundaries have not changed after a change in {@link module:engine/model/document~Document document}\n\t * but the change took place inside the range, effectively changing its content.\n\t *\n\t * @event change:content\n\t * @param {module:engine/model/range~Range} range Range with start and end position equal to start and end position of\n\t * change range.\n\t * @param {Object} data Object with additional information about the change. Those parameters are passed from\n\t * {@link module:engine/model/document~Document#event:change document change event}.\n\t * @param {String} data.type Change type.\n\t * @param {module:engine/model/batch~Batch} data.batch Batch which changed the live range.\n\t * @param {module:engine/model/range~Range} data.range Range containing the result of applied change.\n\t * @param {module:engine/model/position~Position} data.sourcePosition Source position for move, remove and reinsert change types.\n\t */\n}\n\n/**\n * Binds this `LiveRange` to the {@link module:engine/model/document~Document document}\n * that owns this range's {@link module:engine/model/range~Range#root root}.\n *\n * @ignore\n * @private\n * @method module:engine/model/liverange~LiveRange#bindWithDocument\n */\nfunction bindWithDocument() {\n\t// Operation types that a range can be transformed by.\n\tconst supportedTypes = new Set( [ 'insert', 'move', 'remove', 'reinsert' ] );\n\n\tthis.listenTo(\n\t\tthis.root.document.model,\n\t\t'applyOperation',\n\t\t( event, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( supportedTypes.has( operation.type ) ) {\n\t\t\t\ttransform.call( this, operation );\n\t\t\t}\n\t\t},\n\t\t{ priority: 'low' }\n\t);\n}\n\n/**\n * Updates this range accordingly to the updates applied to the model. Bases on change events.\n *\n * @ignore\n * @private\n * @method transform\n * @param {module:engine/model/operation/operation~Operation} operation Executed operation.\n */\nfunction transform( operation ) {\n\tconst changeType = operation.type;\n\tconst batch = operation.delta.batch;\n\n\tlet targetRange;\n\tlet sourcePosition;\n\n\tif ( changeType == 'insert' ) {\n\t\ttargetRange = Range.createFromPositionAndShift( operation.position, operation.nodes.maxOffset );\n\t} else {\n\t\ttargetRange = Range.createFromPositionAndShift( operation.getMovedRangeStart(), operation.howMany );\n\t\tsourcePosition = operation.sourcePosition;\n\t}\n\n\tconst howMany = targetRange.end.offset - targetRange.start.offset;\n\tlet targetPosition = targetRange.start;\n\n\tif ( changeType == 'move' || changeType == 'remove' || changeType == 'reinsert' ) {\n\t\t// Range._getTransformedByDocumentChange is expecting `targetPosition` to be \"before\" move\n\t\t// (before transformation). `targetRange.start` is already after the move happened.\n\t\t// We have to revert `targetPosition` to the state before the move.\n\t\ttargetPosition = targetPosition._getTransformedByInsertion( sourcePosition, howMany );\n\t}\n\n\tconst result = this._getTransformedByDocumentChange( changeType, operation.delta.type, targetPosition, howMany, sourcePosition );\n\n\t// Decide whether moved part should be included in the range.\n\t//\n\t// First, this concerns only `move` change, because insert change includes inserted part always (changeType == 'move').\n\t// Second, this is a case only if moved range was intersecting with this range and was inserted into this range (result.length == 3).\n\tif ( ( changeType == 'move' || changeType == 'remove' || changeType == 'reinsert' ) && result.length == 3 ) {\n\t\t// `result[ 2 ]` is a \"common part\" of this range and moved range. We substitute that common part with the whole\n\t\t// `targetRange` because we want to include whole `targetRange` in this range.\n\t\tresult[ 2 ] = targetRange;\n\t}\n\n\tconst updated = Range.createFromRanges( result );\n\n\tconst boundariesChanged = !updated.isEqual( this );\n\n\tconst rangeExpanded = this.containsPosition( targetPosition );\n\tconst rangeShrunk = sourcePosition && ( this.containsPosition( sourcePosition ) || this.start.isEqual( sourcePosition ) );\n\tconst contentChanged = rangeExpanded || rangeShrunk;\n\n\tif ( boundariesChanged ) {\n\t\t// If range boundaries have changed, fire `change:range` event.\n\t\tconst oldRange = Range.createFromRange( this );\n\n\t\tthis.start = updated.start;\n\t\tthis.end = updated.end;\n\n\t\tthis.fire( 'change:range', oldRange, {\n\t\t\ttype: changeType,\n\t\t\tbatch,\n\t\t\trange: targetRange,\n\t\t\tsourcePosition\n\t\t} );\n\t} else if ( contentChanged ) {\n\t\t// If range boundaries have not changed, but there was change inside the range, fire `change:content` event.\n\t\tthis.fire( 'change:content', Range.createFromRange( this ), {\n\t\t\ttype: changeType,\n\t\t\tbatch,\n\t\t\trange: targetRange,\n\t\t\tsourcePosition\n\t\t} );\n\t}\n}\n\nmix( LiveRange, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/documentselection\n */\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\nimport Selection from './selection';\nimport Position from './position';\nimport LiveRange from './liverange';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\n\nconst storePrefix = 'selection:';\n\n/**\n * `DocumentSelection` is a special selection which is used as the\n * {@link module:engine/model/document~Document#selection document's selection}.\n * There can be only one instance of `DocumentSelection` per document.\n *\n * Document selection can only be changed by using the {@link module:engine/model/writer~Writer} instance\n * inside the {@link module:engine/model/model~Model#change `change()`} block, as it provides a secure way to modify model.\n *\n * `DocumentSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}\n * to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.\n *\n * Differences between {@link module:engine/model/selection~Selection} and `DocumentSelection` are:\n * * there is always a range in `DocumentSelection` - even if no ranges were added there is a \"default range\"\n * present in the selection,\n * * ranges added to this selection updates automatically when the document changes,\n * * attributes of `DocumentSelection` are updated automatically according to selection ranges.\n *\n * Since `DocumentSelection` uses {@link module:engine/model/liverange~LiveRange live ranges}\n * and is updated when {@link module:engine/model/document~Document document}\n * changes, it cannot be set on {@link module:engine/model/node~Node nodes}\n * that are inside {@link module:engine/model/documentfragment~DocumentFragment document fragment}.\n * If you need to represent a selection in document fragment,\n * use {@link module:engine/model/selection~Selection Selection class} instead.\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates an empty live selection for given {@link module:engine/model/document~Document}.\n\t *\n\t * @param {module:engine/model/document~Document} doc Document which owns this selection.\n\t */\n\tconstructor( doc ) {\n\t\t/**\n\t\t * Selection used internally by that class (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @protected\n\t\t */\n\t\tthis._selection = new LiveSelection( doc );\n\n\t\tthis._selection.delegate( 'change:range' ).to( this );\n\t\tthis._selection.delegate( 'change:attribute' ).to( this );\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the most recent part of the selection starts.\n\t * Together with {@link #focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always {@link module:engine/model/range~Range#start start} or\n\t * {@link module:engine/model/range~Range#end end} position of the most recently added range.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #focus\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * Is set to `null` if there are no ranges in selection.\n\t *\n\t * @see #anchor\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Describes whether `Documentselection` has own range(s) set, or if it is defaulted to\n\t * {@link module:engine/model/document~Document#_getDefaultRange document's default range}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget hasOwnRange() {\n\t\treturn this._selection.hasOwnRange;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus}\n\t * precedes {@link #anchor}.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * Describes whether the gravity is overridden (using {@link module:engine/model/writer~Writer#overrideSelectionGravity}) or not.\n\t *\n\t * Note that the gravity remains overridden as long as will not be restored the same number of times as it was overridden.\n\t *\n\t * @readonly\n\t * @returns {Boolean}\n\t */\n\tget isGravityOverridden() {\n\t\treturn this._selection.isGravityOverridden;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/model/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that iterates over copies of selection ranges.\n\t *\n\t * @returns {Iterable.<module:engine/model/range~Range>}\n\t */\n\tgetRanges() {\n\t\treturn this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns the first position in the selection.\n\t * First position is the position that {@link module:engine/model/position~Position#isBefore is before}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns the last position in the selection.\n\t * Last position is the position that {@link module:engine/model/position~Position#isAfter is after}\n\t * any other position in the selection.\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns a copy of the first range in the selection.\n\t * First range is the one which {@link module:engine/model/range~Range#start start} position\n\t * {@link module:engine/model/position~Position#isBefore is before} start position of all other ranges\n\t * (not to confuse with the first range added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns a copy of the last range in the selection.\n\t * Last range is the one which {@link module:engine/model/range~Range#end end} position\n\t * {@link module:engine/model/position~Position#isAfter is after} end position of all other ranges (not to confuse with the range most\n\t * recently added to the selection).\n\t *\n\t * Returns `null` if there are no ranges in selection.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Gets elements of type \"block\" touched by the selection.\n\t *\n\t * This method's result can be used for example to apply block styling to all blocks covered by this selection.\n\t *\n\t * **Note:** `getSelectedBlocks()` always returns the deepest block.\n\t *\n\t * In this case the function will return exactly all 3 paragraphs:\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<quote>\n\t *\t\t\t<paragraph>b</paragraph>\n\t *\t\t</quote>\n\t *\t\t<paragraph>c]d</paragraph>\n\t *\n\t * In this case the paragraph will also be returned, despite the collapsed selection:\n\t *\n\t *\t\t<paragraph>[]a</paragraph>\n\t *\n\t * **Special case**: If a selection ends at the beginning of a block, that block is not returned as from user perspective\n\t * this block wasn't selected. See [#984](https://github.com/ckeditor/ckeditor5-engine/issues/984) for more details.\n\t *\n\t *\t\t<paragraph>[a</paragraph>\n\t *\t\t<paragraph>b</paragraph>\n\t *\t\t<paragraph>]c</paragraph> // this block will not be returned\n\t *\n\t * @returns {Iterator.<module:engine/model/element~Element>}\n\t */\n\tgetSelectedBlocks() {\n\t\treturn this._selection.getSelectedBlocks();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/model/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether the selection contains the entire content of the given element. This means that selection must start\n\t * at a position {@link module:engine/model/position~Position#isTouching touching} the element's start and ends at position\n\t * touching the element's end.\n\t *\n\t * By default, this method will check whether the entire content of the selection's current root is selected.\n\t * Useful to check if e.g. the user has just pressed <kbd>Ctrl</kbd> + <kbd>A</kbd>.\n\t *\n\t * @param {module:engine/model/element~Element} [element=this.anchor.root]\n\t * @returns {Boolean}\n\t */\n\tcontainsEntireContent( element ) {\n\t\treturn this._selection.containsEntireContent( element );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by document selection.\n\t */\n\tdestroy() {\n\t\tthis._selection.destroy();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attribute keys.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetAttributeKeys() {\n\t\treturn this._selection.getAttributeKeys();\n\t}\n\n\t/**\n\t * Returns iterable that iterates over this selection's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\tgetAttributes() {\n\t\treturn this._selection.getAttributes();\n\t}\n\n\t/**\n\t * Gets an attribute value for given key or `undefined` if that attribute is not set on the selection.\n\t *\n\t * @param {String} key Key of attribute to look for.\n\t * @returns {*} Attribute value or `undefined`.\n\t */\n\tgetAttribute( key ) {\n\t\treturn this._selection.getAttribute( key );\n\t}\n\n\t/**\n\t * Checks if the selection has an attribute for given key.\n\t *\n\t * @param {String} key Key of attribute to check.\n\t * @returns {Boolean} `true` if attribute with given key is set on selection, `false` otherwise.\n\t */\n\thasAttribute( key ) {\n\t\treturn this._selection.hasAttribute( key );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/documentselection~DocumentSelection#focus} to the specified location.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionFocus} method.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/model/position~Position.createAt} parameters.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelectionFocus\n\t * @protected\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/model/selection~Selection selection}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/node~Node node}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/range~Range range}, an iterable of {@link module:engine/model/range~Range ranges} or null.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelection} method.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelection\n\t * @protected\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/position~Position|module:engine/model/node~Node|\n\t * Iterable.<module:engine/model/range~Range>|module:engine/model/range~Range|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Sets attribute on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#setSelectionAttribute} method.\n\t *\n\t * @see module:engine/model/writer~Writer#setSelectionAttribute\n\t * @protected\n\t * @param {String} key Key of the attribute to set.\n\t * @param {*} value Attribute value.\n\t */\n\t_setAttribute( key, value ) {\n\t\tthis._selection.setAttribute( key, value );\n\t}\n\n\t/**\n\t * Removes an attribute with given key from the selection.\n\t * If the given attribute was set on the selection, fires the {@link module:engine/model/selection~Selection#event:change:range}\n\t * event with removed attribute key.\n\t * Should be used only within the {@link module:engine/model/writer~Writer#removeSelectionAttribute} method.\n\t *\n\t * @see module:engine/model/writer~Writer#removeSelectionAttribute\n\t * @protected\n\t * @param {String} key Key of the attribute to remove.\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._selection.removeAttribute( key );\n\t}\n\n\t/**\n\t * Returns an iterable that iterates through all selection attributes stored in current selection's parent.\n\t *\n\t * @protected\n\t * @returns {Iterable.<*>}\n\t */\n\t_getStoredAttributes() {\n\t\treturn this._selection._getStoredAttributes();\n\t}\n\n\t/**\n\t * Temporarily changes the gravity of the selection from the left to the right.\n\t *\n\t * The gravity defines from which direction the selection inherits its attributes. If it's the default left\n\t * gravity, the selection (after being moved by the the user) inherits attributes from its left hand side.\n\t * This method allows to temporarily override this behavior by forcing the gravity to the right.\n\t *\n\t * It returns an unique identifier which is required to restore the gravity. It guarantees the symmetry\n\t * of the process.\n\t *\n\t * @see module:engine/model/writer~Writer#overrideSelectionGravity\n\t * @protected\n\t * @returns {String} The unique id which allows restoring the gravity.\n\t */\n\t_overrideGravity() {\n\t\treturn this._selection.overrideGravity();\n\t}\n\n\t/**\n\t * Restores the {@link ~DocumentSelection#_overrideGravity overridden gravity}.\n\t *\n\t * Restoring the gravity is only possible using the unique identifier returned by\n\t * {@link ~DocumentSelection#_overrideGravity}. Note that the gravity remains overridden as long as won't be restored\n\t * the same number of times it was overridden.\n\t *\n\t * @see module:engine/model/writer~Writer#restoreSelectionGravity\n\t * @protected\n\t * @param {String} uid The unique id returned by {@link #_overrideGravity}.\n\t */\n\t_restoreGravity( uid ) {\n\t\tthis._selection.restoreGravity( uid );\n\t}\n\n\t/**\n\t * Generates and returns an attribute key for selection attributes store, basing on original attribute key.\n\t *\n\t * @protected\n\t * @param {String} key Attribute key to convert.\n\t * @returns {String} Converted attribute key, applicable for selection store.\n\t */\n\tstatic _getStoreAttributeKey( key ) {\n\t\treturn storePrefix + key;\n\t}\n\n\t/**\n\t * Checks whether the given attribute key is an attribute stored on an element.\n\t *\n\t * @protected\n\t * @param {String} key\n\t * @returns {Boolean}\n\t */\n\tstatic _isStoreAttributeKey( key ) {\n\t\treturn key.startsWith( storePrefix );\n\t}\n}\n\nmix( DocumentSelection, EmitterMixin );\n\n/**\n * Fired when selection range(s) changed.\n *\n * @event change:range\n * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its position\n * was directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n * changed because the structure of the model has been changed (which means an indirect change).\n * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n * which mean that they are not updated once the document changes.\n */\n\n/**\n * Fired when selection attribute changed.\n *\n * @event change:attribute\n * @param {Boolean} directChange In case of {@link module:engine/model/selection~Selection} class it is always set\n * to `true` which indicates that the selection change was caused by a direct use of selection's API.\n * The {@link module:engine/model/documentselection~DocumentSelection}, however, may change because its attributes\n * were directly changed through the {@link module:engine/model/writer~Writer writer} or because its position was\n * changed in the model and its attributes were refreshed (which means an indirect change).\n * The indirect change does not occur in case of normal (detached) selections because they are \"static\" (as \"not live\")\n * which mean that they are not updated once the document changes.\n * @param {Array.<String>} attributeKeys Array containing keys of attributes that changed.\n */\n\n// `LiveSelection` is used internally by {@link module:engine/model/documentselection~DocumentSelection} and shouldn't be used directly.\n//\n// LiveSelection` is automatically updated upon changes in the {@link module:engine/model/document~Document document}\n// to always contain valid ranges. Its attributes are inherited from the text unless set explicitly.\n//\n// Differences between {@link module:engine/model/selection~Selection} and `LiveSelection` are:\n// * there is always a range in `LiveSelection` - even if no ranges were added there is a \"default range\"\n// present in the selection,\n// * ranges added to this selection updates automatically when the document changes,\n// * attributes of `LiveSelection` are updated automatically according to selection ranges.\n//\n// @extends module:engine/model/selection~Selection\n//\n\nclass LiveSelection extends Selection {\n\t// Creates an empty live selection for given {@link module:engine/model/document~Document}.\n\t// @param {module:engine/model/document~Document} doc Document which owns this selection.\n\tconstructor( doc ) {\n\t\tsuper();\n\n\t\t// Document which owns this selection.\n\t\t//\n\t\t// @protected\n\t\t// @member {module:engine/model/model~Model}\n\t\tthis._model = doc.model;\n\n\t\t// Document which owns this selection.\n\t\t//\n\t\t// @protected\n\t\t// @member {module:engine/model/document~Document}\n\t\tthis._document = doc;\n\n\t\t// Keeps mapping of attribute name to priority with which the attribute got modified (added/changed/removed)\n\t\t// last time. Possible values of priority are: `'low'` and `'normal'`.\n\t\t//\n\t\t// Priorities are used by internal `LiveSelection` mechanisms. All attributes set using `LiveSelection`\n\t\t// attributes API are set with `'normal'` priority.\n\t\t//\n\t\t// @private\n\t\t// @member {Map} module:engine/model/liveselection~LiveSelection#_attributePriority\n\t\tthis._attributePriority = new Map();\n\n\t\t// Contains data required to fix ranges which have been moved to the graveyard.\n\t\t// @private\n\t\t// @member {Array} module:engine/model/liveselection~LiveSelection#_fixGraveyardRangesData\n\t\tthis._fixGraveyardRangesData = [];\n\n\t\t// Flag that informs whether the selection ranges have changed. It is changed on true when `LiveRange#change:range` event is fired.\n\t\t// @private\n\t\t// @member {Array} module:engine/model/liveselection~LiveSelection#_hasChangedRange\n\t\tthis._hasChangedRange = false;\n\n\t\t// Each overriding gravity adds an UID to the set and each removal removes it.\n\t\t// Gravity is overridden when there's at least one UID in the set.\n\t\t// Gravity is restored when the set is empty.\n\t\t// This is to prevent conflicts when gravity is overridden by more than one feature at the same time.\n\t\t// @private\n\t\t// @type {Set}\n\t\tthis._overriddenGravityRegister = new Set();\n\n\t\t// Add events that will ensure selection correctness.\n\t\tthis.on( 'change:range', () => {\n\t\t\tfor ( const range of this.getRanges() ) {\n\t\t\t\tif ( !this._document._validateSelectionRange( range ) ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Range from {@link module:engine/model/documentselection~DocumentSelection document selection}\n\t\t\t\t\t * starts or ends at incorrect position.\n\t\t\t\t\t *\n\t\t\t\t\t * @error document-selection-wrong-position\n\t\t\t\t\t * @param {module:engine/model/range~Range} range\n\t\t\t\t\t */\n\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t'document-selection-wrong-position: Range from document selection starts or ends at incorrect position.',\n\t\t\t\t\t\t{ range }\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\tthis.listenTo( this._document, 'change', ( evt, batch ) => {\n\t\t\t// Update selection's attributes.\n\t\t\tthis._updateAttributes( false );\n\n\t\t\t// Clear selection attributes from element if no longer empty.\n\t\t\tclearAttributesStoredInElement( this._model, batch );\n\t\t} );\n\n\t\tthis.listenTo( this._model, 'applyOperation', () => {\n\t\t\twhile ( this._fixGraveyardRangesData.length ) {\n\t\t\t\tconst { liveRange, sourcePosition } = this._fixGraveyardRangesData.shift();\n\n\t\t\t\tthis._fixGraveyardSelection( liveRange, sourcePosition );\n\t\t\t}\n\n\t\t\tif ( this._hasChangedRange ) {\n\t\t\t\tthis._hasChangedRange = false;\n\n\t\t\t\tthis.fire( 'change:range', { directChange: false } );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\tget isCollapsed() {\n\t\tconst length = this._ranges.length;\n\n\t\treturn length === 0 ? this._document._getDefaultRange().isCollapsed : super.isCollapsed;\n\t}\n\n\tget anchor() {\n\t\treturn super.anchor || this._document._getDefaultRange().start;\n\t}\n\n\tget focus() {\n\t\treturn super.focus || this._document._getDefaultRange().end;\n\t}\n\n\tget rangeCount() {\n\t\treturn this._ranges.length ? this._ranges.length : 1;\n\t}\n\n\t// Describes whether `LiveSelection` has own range(s) set, or if it is defaulted to\n\t// {@link module:engine/model/document~Document#_getDefaultRange document's default range}.\n\t//\n\t// @readonly\n\t// @type {Boolean}\n\tget hasOwnRange() {\n\t\treturn this._ranges.length > 0;\n\t}\n\n\t// When set to `true` then selection attributes on node before the caret won't be taken\n\t// into consideration while updating selection attributes.\n\t//\n\t// @protected\n\t// @type {Boolean}\n\tget isGravityOverridden() {\n\t\treturn !!this._overriddenGravityRegister.size;\n\t}\n\n\t// Unbinds all events previously bound by live selection.\n\tdestroy() {\n\t\tfor ( let i = 0; i < this._ranges.length; i++ ) {\n\t\t\tthis._ranges[ i ].detach();\n\t\t}\n\n\t\tthis.stopListening();\n\t}\n\n\t* getRanges() {\n\t\tif ( this._ranges.length ) {\n\t\t\tyield* super.getRanges();\n\t\t} else {\n\t\t\tyield this._document._getDefaultRange();\n\t\t}\n\t}\n\n\tgetFirstRange() {\n\t\treturn super.getFirstRange() || this._document._getDefaultRange();\n\t}\n\n\tgetLastRange() {\n\t\treturn super.getLastRange() || this._document._getDefaultRange();\n\t}\n\n\tsetTo( selectable, optionsOrPlaceOrOffset, options ) {\n\t\tsuper.setTo( selectable, optionsOrPlaceOrOffset, options );\n\t\tthis._refreshAttributes();\n\t}\n\n\tsetFocus( itemOrPosition, offset ) {\n\t\tsuper.setFocus( itemOrPosition, offset );\n\t\tthis._refreshAttributes();\n\t}\n\n\tsetAttribute( key, value ) {\n\t\tif ( this._setAttribute( key, value ) ) {\n\t\t\t// Fire event with exact data.\n\t\t\tconst attributeKeys = [ key ];\n\t\t\tthis.fire( 'change:attribute', { attributeKeys, directChange: true } );\n\t\t}\n\t}\n\n\tremoveAttribute( key ) {\n\t\tif ( this._removeAttribute( key ) ) {\n\t\t\t// Fire event with exact data.\n\t\t\tconst attributeKeys = [ key ];\n\t\t\tthis.fire( 'change:attribute', { attributeKeys, directChange: true } );\n\t\t}\n\t}\n\n\toverrideGravity() {\n\t\tconst overrideUid = uid();\n\n\t\t// Remember that another overriding has been requested. It will need to be removed\n\t\t// before the gravity is to be restored.\n\t\tthis._overriddenGravityRegister.add( overrideUid );\n\n\t\tif ( this._overriddenGravityRegister.size === 1 ) {\n\t\t\tthis._refreshAttributes();\n\t\t}\n\n\t\treturn overrideUid;\n\t}\n\n\trestoreGravity( uid ) {\n\t\tif ( !this._overriddenGravityRegister.has( uid ) ) {\n\t\t\t/**\n\t\t\t * Restoring gravity for an unknown UID is not possible. Make sure you are using a correct\n\t\t\t * UID obtained from the {@link module:engine/model/writer~Writer#overrideSelectionGravity} to restore.\n\t\t\t *\n\t\t\t * @error document-selection-gravity-wrong-restore\n\t\t\t * @param {String} uid The unique identifier returned by {@link #overrideGravity}.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'document-selection-gravity-wrong-restore: Attempting to restore the selection gravity for an unknown UID.',\n\t\t\t\t{ uid }\n\t\t\t);\n\t\t}\n\n\t\tthis._overriddenGravityRegister.delete( uid );\n\n\t\t// Restore gravity only when all overriding have been restored.\n\t\tif ( !this.isGravityOverridden ) {\n\t\t\tthis._refreshAttributes();\n\t\t}\n\t}\n\n\t// Removes all attributes from the selection and sets attributes according to the surrounding nodes.\n\t_refreshAttributes() {\n\t\tthis._updateAttributes( true );\n\t}\n\n\t_popRange() {\n\t\tthis._ranges.pop().detach();\n\t}\n\n\t_pushRange( range ) {\n\t\tconst liveRange = this._prepareRange( range );\n\n\t\t// `undefined` is returned when given `range` is in graveyard root.\n\t\tif ( liveRange ) {\n\t\t\tthis._ranges.push( liveRange );\n\t\t}\n\t}\n\n\t// Prepares given range to be added to selection. Checks if it is correct,\n\t// converts it to {@link module:engine/model/liverange~LiveRange LiveRange}\n\t// and sets listeners listening to the range's change event.\n\t//\n\t// @private\n\t// @param {module:engine/model/range~Range} range\n\t_prepareRange( range ) {\n\t\tthis._checkRange( range );\n\n\t\tif ( range.root == this._document.graveyard ) {\n\t\t\t/**\n\t\t\t * Trying to add a Range that is in the graveyard root. Range rejected.\n\t\t\t *\n\t\t\t * @warning model-selection-range-in-graveyard\n\t\t\t */\n\t\t\tlog.warn( 'model-selection-range-in-graveyard: Trying to add a Range that is in the graveyard root. Range rejected.' );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst liveRange = LiveRange.createFromRange( range );\n\n\t\tliveRange.on( 'change:range', ( evt, oldRange, data ) => {\n\t\t\tthis._hasChangedRange = true;\n\n\t\t\t// If `LiveRange` is in whole moved to the graveyard, save necessary data. It will be fixed on `Model#applyOperation` event.\n\t\t\tif ( liveRange.root == this._document.graveyard ) {\n\t\t\t\tthis._fixGraveyardRangesData.push( {\n\t\t\t\t\tliveRange,\n\t\t\t\t\tsourcePosition: data.sourcePosition\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\n\t\treturn liveRange;\n\t}\n\n\t// Updates this selection attributes according to its ranges and the {@link module:engine/model/document~Document model document}.\n\t//\n\t// @protected\n\t// @param {Boolean} clearAll\n\t// @fires change:attribute\n\t_updateAttributes( clearAll ) {\n\t\tconst newAttributes = toMap( this._getSurroundingAttributes() );\n\t\tconst oldAttributes = toMap( this.getAttributes() );\n\n\t\tif ( clearAll ) {\n\t\t\t// If `clearAll` remove all attributes and reset priorities.\n\t\t\tthis._attributePriority = new Map();\n\t\t\tthis._attrs = new Map();\n\t\t} else {\n\t\t\t// If not, remove only attributes added with `low` priority.\n\t\t\tfor ( const [ key, priority ] of this._attributePriority ) {\n\t\t\t\tif ( priority == 'low' ) {\n\t\t\t\t\tthis._attrs.delete( key );\n\t\t\t\t\tthis._attributePriority.delete( key );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tthis._setAttributesTo( newAttributes );\n\n\t\t// Let's evaluate which attributes really changed.\n\t\tconst changed = [];\n\n\t\t// First, loop through all attributes that are set on selection right now.\n\t\t// Check which of them are different than old attributes.\n\t\tfor ( const [ newKey, newValue ] of this.getAttributes() ) {\n\t\t\tif ( !oldAttributes.has( newKey ) || oldAttributes.get( newKey ) !== newValue ) {\n\t\t\t\tchanged.push( newKey );\n\t\t\t}\n\t\t}\n\n\t\t// Then, check which of old attributes got removed.\n\t\tfor ( const [ oldKey ] of oldAttributes ) {\n\t\t\tif ( !this.hasAttribute( oldKey ) ) {\n\t\t\t\tchanged.push( oldKey );\n\t\t\t}\n\t\t}\n\n\t\t// Fire event with exact data (fire only if anything changed).\n\t\tif ( changed.length > 0 ) {\n\t\t\tthis.fire( 'change:attribute', { attributeKeys: changed, directChange: false } );\n\t\t}\n\t}\n\n\t// Internal method for setting `LiveSelection` attribute. Supports attribute priorities (through `directChange`\n\t// parameter).\n\t//\n\t// @private\n\t// @param {String} key Attribute key.\n\t// @param {*} value Attribute value.\n\t// @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change\n\t// is caused by `Batch` API.\n\t// @returns {Boolean} Whether value has changed.\n\t_setAttribute( key, value, directChange = true ) {\n\t\tconst priority = directChange ? 'normal' : 'low';\n\n\t\tif ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {\n\t\t\t// Priority too low.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst oldValue = super.getAttribute( key );\n\n\t\t// Don't do anything if value has not changed.\n\t\tif ( oldValue === value ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tthis._attrs.set( key, value );\n\n\t\t// Update priorities map.\n\t\tthis._attributePriority.set( key, priority );\n\n\t\treturn true;\n\t}\n\n\t// Internal method for removing `LiveSelection` attribute. Supports attribute priorities (through `directChange`\n\t// parameter).\n\t//\n\t// NOTE: Even if attribute is not present in the selection but is provided to this method, it's priority will\n\t// be changed according to `directChange` parameter.\n\t//\n\t// @private\n\t// @param {String} key Attribute key.\n\t// @param {Boolean} [directChange=true] `true` if the change is caused by `Selection` API, `false` if change\n\t// is caused by `Batch` API.\n\t// @returns {Boolean} Whether attribute was removed. May not be true if such attributes didn't exist or the\n\t// existing attribute had higher priority.\n\t_removeAttribute( key, directChange = true ) {\n\t\tconst priority = directChange ? 'normal' : 'low';\n\n\t\tif ( priority == 'low' && this._attributePriority.get( key ) == 'normal' ) {\n\t\t\t// Priority too low.\n\t\t\treturn false;\n\t\t}\n\n\t\t// Update priorities map.\n\t\tthis._attributePriority.set( key, priority );\n\n\t\t// Don't do anything if value has not changed.\n\t\tif ( !super.hasAttribute( key ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tthis._attrs.delete( key );\n\n\t\treturn true;\n\t}\n\n\t// Internal method for setting multiple `LiveSelection` attributes. Supports attribute priorities (through\n\t// `directChange` parameter).\n\t//\n\t// @private\n\t// @param {Map.<String,*>} attrs Iterable object containing attributes to be set.\n\t// @returns {Set.<String>} Changed attribute keys.\n\t_setAttributesTo( attrs ) {\n\t\tconst changed = new Set();\n\n\t\tfor ( const [ oldKey, oldValue ] of this.getAttributes() ) {\n\t\t\t// Do not remove attribute if attribute with same key and value is about to be set.\n\t\t\tif ( attrs.get( oldKey ) === oldValue ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\t// All rest attributes will be removed so changed attributes won't change .\n\t\t\tthis._removeAttribute( oldKey, false );\n\t\t}\n\n\t\tfor ( const [ key, value ] of attrs ) {\n\t\t\t// Attribute may not be set because of attributes or because same key/value is already added.\n\t\t\tconst gotAdded = this._setAttribute( key, value, false );\n\n\t\t\tif ( gotAdded ) {\n\t\t\t\tchanged.add( key );\n\t\t\t}\n\t\t}\n\n\t\treturn changed;\n\t}\n\n\t// Returns an iterable that iterates through all selection attributes stored in current selection's parent.\n\t//\n\t// @protected\n\t// @returns {Iterable.<*>}\n\t* _getStoredAttributes() {\n\t\tconst selectionParent = this.getFirstPosition().parent;\n\n\t\tif ( this.isCollapsed && selectionParent.isEmpty ) {\n\t\t\tfor ( const key of selectionParent.getAttributeKeys() ) {\n\t\t\t\tif ( key.startsWith( storePrefix ) ) {\n\t\t\t\t\tconst realKey = key.substr( storePrefix.length );\n\n\t\t\t\t\tyield [ realKey, selectionParent.getAttribute( key ) ];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t// Checks model text nodes that are closest to the selection's first position and returns attributes of first\n\t// found element. If there are no text nodes in selection's first position parent, it returns selection\n\t// attributes stored in that parent.\n\t//\n\t// @private\n\t// @returns {Iterable.<*>} Collection of attributes.\n\t_getSurroundingAttributes() {\n\t\tconst position = this.getFirstPosition();\n\t\tconst schema = this._model.schema;\n\n\t\tlet attrs = null;\n\n\t\tif ( !this.isCollapsed ) {\n\t\t\t// 1. If selection is a range...\n\t\t\tconst range = this.getFirstRange();\n\n\t\t\t// ...look for a first character node in that range and take attributes from it.\n\t\t\tfor ( const value of range ) {\n\t\t\t\t// If the item is an object, we don't want to get attributes from its children.\n\t\t\t\tif ( value.item.is( 'element' ) && schema.isObject( value.item ) ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\t// This is not an optimal solution because of https://github.com/ckeditor/ckeditor5-engine/issues/454.\n\t\t\t\t// It can be done better by using `break;` instead of checking `attrs === null`.\n\t\t\t\tif ( value.type == 'text' && attrs === null ) {\n\t\t\t\t\tattrs = value.item.getAttributes();\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\t// 2. If the selection is a caret or the range does not contain a character node...\n\n\t\t\tconst nodeBefore = position.textNode ? position.textNode : position.nodeBefore;\n\t\t\tconst nodeAfter = position.textNode ? position.textNode : position.nodeAfter;\n\n\t\t\t// When gravity is overridden then don't take node before into consideration.\n\t\t\tif ( !this.isGravityOverridden ) {\n\t\t\t\t// ...look at the node before caret and take attributes from it if it is a character node.\n\t\t\t\tattrs = getAttrsIfCharacter( nodeBefore );\n\t\t\t}\n\n\t\t\t// 3. If not, look at the node after caret...\n\t\t\tif ( !attrs ) {\n\t\t\t\tattrs = getAttrsIfCharacter( nodeAfter );\n\t\t\t}\n\n\t\t\t// 4. If not, try to find the first character on the left, that is in the same node.\n\t\t\t// When gravity is overridden then don't take node before into consideration.\n\t\t\tif ( !this.isGravityOverridden && !attrs ) {\n\t\t\t\tlet node = nodeBefore;\n\n\t\t\t\twhile ( node && !attrs ) {\n\t\t\t\t\tnode = node.previousSibling;\n\t\t\t\t\tattrs = getAttrsIfCharacter( node );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// 5. If not found, try to find the first character on the right, that is in the same node.\n\t\t\tif ( !attrs ) {\n\t\t\t\tlet node = nodeAfter;\n\n\t\t\t\twhile ( node && !attrs ) {\n\t\t\t\t\tnode = node.nextSibling;\n\t\t\t\t\tattrs = getAttrsIfCharacter( node );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// 6. If not found, selection should retrieve attributes from parent.\n\t\t\tif ( !attrs ) {\n\t\t\t\tattrs = this._getStoredAttributes();\n\t\t\t}\n\t\t}\n\n\t\treturn attrs;\n\t}\n\n\t// Fixes a selection range after it ends up in graveyard root.\n\t//\n\t// @private\n\t// @param {module:engine/model/liverange~LiveRange} liveRange The range from selection, that ended up in the graveyard root.\n\t// @param {module:engine/model/position~Position} removedRangeStart Start position of a range which was removed.\n\t_fixGraveyardSelection( liveRange, removedRangeStart ) {\n\t\t// The start of the removed range is the closest position to the `liveRange` - the original selection range.\n\t\t// This is a good candidate for a fixed selection range.\n\t\tconst positionCandidate = Position.createFromPosition( removedRangeStart );\n\n\t\t// Find a range that is a correct selection range and is closest to the start of removed range.\n\t\tconst selectionRange = this._model.schema.getNearestSelectionRange( positionCandidate );\n\n\t\t// Remove the old selection range before preparing and adding new selection range. This order is important,\n\t\t// because new range, in some cases, may intersect with old range (it depends on `getNearestSelectionRange()` result).\n\t\tconst index = this._ranges.indexOf( liveRange );\n\t\tthis._ranges.splice( index, 1 );\n\t\tliveRange.detach();\n\n\t\t// If nearest valid selection range has been found - add it in the place of old range.\n\t\tif ( selectionRange ) {\n\t\t\t// Check the range, convert it to live range, bind events, etc.\n\t\t\tconst newRange = this._prepareRange( selectionRange );\n\n\t\t\t// Add new range in the place of old range.\n\t\t\tthis._ranges.splice( index, 0, newRange );\n\t\t}\n\t\t// If nearest valid selection range cannot be found - just removing the old range is fine.\n\t}\n}\n\n// Helper function for {@link module:engine/model/liveselection~LiveSelection#_updateAttributes}.\n//\n// It takes model item, checks whether it is a text node (or text proxy) and, if so, returns it's attributes. If not, returns `null`.\n//\n// @param {module:engine/model/item~Item|null}  node\n// @returns {Boolean}\nfunction getAttrsIfCharacter( node ) {\n\tif ( node instanceof TextProxy || node instanceof Text ) {\n\t\treturn node.getAttributes();\n\t}\n\n\treturn null;\n}\n\n// Removes selection attributes from element which is not empty anymore.\n//\n// @private\n// @param {module:engine/model/model~Model} model\n// @param {module:engine/model/batch~Batch} batch\nfunction clearAttributesStoredInElement( model, batch ) {\n\tconst differ = model.document.differ;\n\n\tfor ( const entry of differ.getChanges() ) {\n\t\tif ( entry.type != 'insert' ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst changeParent = entry.position.parent;\n\t\tconst isNoLongerEmpty = entry.length === changeParent.maxOffset;\n\n\t\tif ( isNoLongerEmpty ) {\n\t\t\tmodel.enqueueChange( batch, writer => {\n\t\t\t\tconst storedAttributes = Array.from( changeParent.getAttributeKeys() )\n\t\t\t\t\t.filter( key => key.startsWith( storePrefix ) );\n\n\t\t\t\tfor ( const key of storedAttributes ) {\n\t\t\t\t\twriter.removeAttribute( key, changeParent );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n}\n","import baseClone from './_baseClone';\n\n/**\n * This method is like `_.clone` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 1.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @returns {*} Returns the deep cloned value.\n * @see _.clone\n * @example\n *\n * var objects = [{ 'a': 1 }, { 'b': 2 }];\n *\n * var deep = _.cloneDeep(objects);\n * console.log(deep[0] === objects[0]);\n * // => false\n */\nfunction cloneDeep(value) {\n  return baseClone(value, true, true);\n}\n\nexport default cloneDeep;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport ModelRange from '../model/range';\nimport ModelSelection from '../model/selection';\nimport ModelElement from '../model/element';\n\nimport ViewAttributeElement from '../view/attributeelement';\nimport ViewRange from '../view/range';\nimport DocumentSelection from '../model/documentselection';\n\nimport cloneDeep from '@ckeditor/ckeditor5-utils/src/lib/lodash/cloneDeep';\n\n/**\n * Contains downcast (model-to-view) converters for {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}.\n *\n * @module engine/conversion/downcast-converters\n */\n\n/**\n * Model element to view element conversion helper.\n *\n * This conversion results in creating a view element. For example, model `<paragraph>Foo</paragraph>` becomes `<p>Foo</p>` in the view.\n *\n *\t\tdowncastElementToElement( { model: 'paragraph', view: 'p' } );\n *\n *\t\tdowncastElementToElement( { model: 'paragraph', view: 'div', converterPriority: 'high' } );\n *\n *\t\tdowncastElementToElement( {\n *\t\t\tmodel: 'fancyParagraph',\n *\t\t\tview: {\n *\t\t\t\tname: 'p',\n *\t\t\t\tclasses: 'fancy'\n *\t\t\t}\n *\t\t} );\n *\n * \t\tdowncastElementToElement( {\n * \t\t\tmodel: 'heading',\n * \t\t\tview: ( modelElement, viewWriter ) => viewWriter.createContainerElement( 'h' + modelElement.getAttribute( 'level' ) )\n * \t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n * to the conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String} config.model The name of the model element to convert.\n * @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view A view element definition or a function\n * that takes the model element and view writer as parameters and returns a view container element.\n * @returns {Function} Conversion helper.\n */\nexport function downcastElementToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconfig.view = _normalizeToElementConfig( config.view, 'container' );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'insert:' + config.model, insertElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * Model attribute to view element conversion helper.\n *\n * This conversion results in wrapping view nodes with a view attribute element. For example, a model text node with\n * `\"Foo\"` as data and the `bold` attribute becomes `<strong>Foo</strong>` in the view.\n *\n *\t\tdowncastAttributeToElement( { model: 'bold', view: 'strong' } );\n *\n *\t\tdowncastAttributeToElement( { model: 'bold', view: 'b', converterPriority: 'high' } );\n *\n *\t\tdowncastAttributeToElement( {\n *\t\t\tmodel: 'invert',\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tclasses: [ 'font-light', 'bg-dark' ]\n *\t\t\t}\n *\t\t} );\n *\n *\t\tdowncastAttributeToElement( {\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'fontSize',\n *\t\t\t\tvalues: [ 'big', 'small' ]\n *\t\t\t},\n *\t\t\tview: {\n *\t\t\t\tbig: {\n *\t\t\t\t\tname: 'span',\n *\t\t\t\t\tstyles: {\n *\t\t\t\t\t\t'font-size': '1.2em'\n *\t\t\t\t\t}\n *\t\t\t\t},\n *\t\t\t\tsmall: {\n *\t\t\t\t\tname: 'span',\n *\t\t\t\t\tstyles: {\n *\t\t\t\t\t\t'font-size': '0.8em'\n *\t\t\t\t\t}\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * \t\tdowncastAttributeToElement( {\n * \t\t\tmodel: 'bold',\n * \t\t\tview: ( modelAttributeValue, viewWriter ) => {\n * \t\t\t\treturn viewWriter.createAttributeElement( 'span', { style: 'font-weight:' + modelAttributeValue } );\n * \t\t\t}\n * \t\t} );\n *\n *\t\tdowncastAttributeToElement( {\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'color',\n *\t\t\t\tname: '$text'\n *\t\t\t},\n *\t\t\tview: ( modelAttributeValue, viewWriter ) => {\n *\t\t\t\treturn viewWriter.createAttributeElement( 'span', { style: 'color:' + modelAttributeValue } );\n *\t\t\t}\n *\t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n * to the conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values }` object. `values` is an array\n * of `String`s with possible values if the model attribute is an enumerable.\n * @param {module:engine/view/elementdefinition~ElementDefinition|Function|Object} config.view A view element definition or a function\n * that takes the model attribute value and view writer as parameters and returns a view attribute element. If `config.model.values` is\n * given, `config.view` should be an object assigning values from `config.model.values` to view element definitions or functions.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function downcastAttributeToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst modelKey = config.model.key ? config.model.key : config.model;\n\tlet eventName = 'attribute:' + modelKey;\n\n\tif ( config.model.name ) {\n\t\teventName += ':' + config.model.name;\n\t}\n\n\tif ( config.model.values ) {\n\t\tfor ( const modelValue of config.model.values ) {\n\t\t\tconfig.view[ modelValue ] = _normalizeToElementConfig( config.view[ modelValue ], 'attribute' );\n\t\t}\n\t} else {\n\t\tconfig.view = _normalizeToElementConfig( config.view, 'attribute' );\n\t}\n\n\tconst elementCreator = _getFromAttributeCreator( config );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, wrap( elementCreator ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * Model attribute to view attribute conversion helper.\n *\n * This conversion results in adding an attribute to a view node, basing on an attribute from a model node. For example,\n * `<image src='foo.jpg'></image>` is converted to `<img src='foo.jpg'></img>`.\n *\n *\t\tdowncastAttributeToAttribute( { model: 'source', view: 'src' } );\n *\n *\t\tdowncastAttributeToAttribute( { model: 'source', view: 'href', converterPriority: 'high' } );\n *\n *\t\tdowncastAttributeToAttribute( {\n *\t\t\tmodel: {\n *\t\t\t\tname: 'image',\n *\t\t\t\tkey: 'source'\n *\t\t\t},\n *\t\t\tview: 'src'\n *\t\t} );\n *\n *\t\tdowncastAttributeToAttribute( {\n *\t\t\tmodel: {\n *\t\t\t\tname: 'styled',\n *\t\t\t\tvalues: [ 'dark', 'light' ]\n *\t\t\t},\n *\t\t\tview: {\n *\t\t\t\tdark: {\n *\t\t\t\t\tkey: 'class',\n *\t\t\t\t\tvalue: [ 'styled', 'styled-dark' ]\n *\t\t\t\t},\n *\t\t\t\tlight: {\n *\t\t\t\t\tkey: 'class',\n *\t\t\t\t\tvalue: [ 'styled', 'styled-light' ]\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n *\t\tdowncastAttributeToAttribute( {\n *\t\t\tmodel: 'styled',\n *\t\t\tview: modelAttributeValue => ( { key: 'class', value: 'styled-' + modelAttributeValue } )\n *\t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for `conversion.for()`} to learn how to add a converter\n * to the conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String|Object} config.model The key of the attribute to convert from or a `{ key, values, [ name ] }` object describing\n * the attribute key, possible values and, optionally, an element name to convert from.\n * @param {String|Object|Function} config.view A view attribute key, or a `{ key, value }` object or a function that takes\n * the model attribute value and returns a `{ key, value }` object. If `key` is `'class'`, `value` can be a `String` or an\n * array of `String`s. If `key` is `'style'`, `value` is an object with key-value pairs. In other cases, `value` is a `String`.\n * If `config.model.values` is set, `config.view` should be an object assigning values from `config.model.values` to\n * `{ key, value }` objects or a functions.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function downcastAttributeToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst modelKey = config.model.key ? config.model.key : config.model;\n\tlet eventName = 'attribute:' + modelKey;\n\n\tif ( config.model.name ) {\n\t\teventName += ':' + config.model.name;\n\t}\n\n\tif ( config.model.values ) {\n\t\tfor ( const modelValue of config.model.values ) {\n\t\t\tconfig.view[ modelValue ] = _normalizeToAttributeConfig( config.view[ modelValue ] );\n\t\t}\n\t} else {\n\t\tconfig.view = _normalizeToAttributeConfig( config.view );\n\t}\n\n\tconst elementCreator = _getFromAttributeCreator( config );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, changeAttribute( elementCreator ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * Model marker to view element conversion helper.\n *\n * This conversion results in creating a view element on the boundaries of the converted marker. If the converted marker\n * is collapsed, only one element is created. For example, model marker set like this: `<paragraph>F[oo b]ar</paragraph>`\n * becomes `<p>F<span data-marker=\"search\"></span>oo b<span data-marker=\"search\"></span>ar</p>` in the view.\n *\n *\t\tdowncastMarkerToElement( { model: 'search', view: 'marker-search' } );\n *\n *\t\tdowncastMarkerToElement( { model: 'search', view: 'search-result', converterPriority: 'high' } );\n *\n *\t\tdowncastMarkerToElement( {\n *\t\t\tmodel: 'search',\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tattributes: {\n *\t\t\t\t\t'data-marker': 'search'\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * \t\tdowncastMarkerToElement( {\n * \t\t\tmodel: 'search',\n * \t\t\tview: ( markerData, viewWriter ) => {\n *\t \t\t\treturn viewWriter.createUIElement( 'span', { 'data-marker': 'search', 'data-start': markerData.isOpening } );\n * \t\t\t}\n * \t\t} );\n *\n * If a function is passed as the `config.view` parameter, it will be used to generate both boundary elements. The function\n * receives the `data` object as a parameter and should return an instance of the\n * {@link module:engine/view/uielement~UIElement view UI element}. The `data` and `conversionApi` objects are passed from\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}. Additionally,\n * the `data.isOpening` parameter is passed, which is set to `true` for the marker start boundary element, and `false` to\n * the marker end boundary element.\n *\n * This kind of conversion is useful for saving data into the database, so it should be used in the data conversion pipeline.\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add a converter to the conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String} config.model The name of the model marker (or model marker group) to convert.\n * @param {module:engine/view/elementdefinition~ElementDefinition|Function} config.view A view element definition or a function\n * that takes the model marker data as a parameter and returns a view UI element.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function downcastMarkerToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconfig.view = _normalizeToElementConfig( config.view, 'ui' );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'addMarker:' + config.model, insertUIElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'removeMarker:' + config.model, removeUIElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * Model marker to highlight conversion helper.\n *\n * This conversion results in creating a highlight on view nodes. For this kind of conversion,\n * {@link module:engine/conversion/downcast-converters~HighlightDescriptor} should be provided.\n *\n * For text nodes, a `<span>` {@link module:engine/view/attributeelement~AttributeElement} is created and it wraps all text nodes\n * in the converted marker range. For example, a model marker set like this: `<paragraph>F[oo b]ar</paragraph>` becomes\n * `<p>F<span class=\"comment\">oo b</span>ar</p>` in the view.\n *\n * {@link module:engine/view/containerelement~ContainerElement} may provide a custom way of handling highlight. Most often,\n * the element itself is given classes and attributes described in the highlight descriptor (instead of being wrapped in `<span>`).\n * For example, a model marker set like this: `[<image src=\"foo.jpg\"></image>]` becomes `<img src=\"foo.jpg\" class=\"comment\"></img>`\n * in the view.\n *\n * For container elements, the conversion is two-step. While the converter processes the highlight descriptor and passes it\n * to a container element, it is the container element instance itself that applies values from the highlight descriptor.\n * So, in a sense, the converter takes care of stating what should be applied on what, while the element decides how to apply that.\n *\n *\t\tdowncastMarkerToHighlight( { model: 'comment', view: { classes: 'comment' } } );\n *\n *\t\tdowncastMarkerToHighlight( { model: 'comment', view: { classes: 'new-comment' }, converterPriority: 'high' } );\n *\n * \t\tdowncastMarkerToHighlight( {\n * \t\t\tmodel: 'comment',\n * \t\t\tview: data => {\n * \t\t\t\t// Assuming that the marker name is in a form of comment:commentType.\n *\t \t\t\tconst commentType = data.markerName.split( ':' )[ 1 ];\n *\n *\t \t\t\treturn {\n *\t \t\t\t\tclasses: [ 'comment', 'comment-' + commentType ]\n *\t \t\t\t};\n * \t\t\t}\n * \t\t} );\n *\n * If a function is passed as the `config.view` parameter, it will be used to generate the highlight descriptor. The function\n * receives the `data` object as a parameter and should return a\n * {@link module:engine/conversion/downcast-converters~HighlightDescriptor highlight descriptor}.\n * The `data` object properties are passed from {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker}.\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add a converter to the conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String} config.model The name of the model marker (or model marker group) to convert.\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor|Function} config.view A highlight descriptor\n * that will be used for highlighting or a function that takes the model marker data as a parameter and returns a highlight descriptor.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function downcastMarkerToHighlight( config ) {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'addMarker:' + config.model, highlightText( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'addMarker:' + config.model, highlightElement( config.view ), { priority: config.converterPriority || 'normal' } );\n\t\tdispatcher.on( 'removeMarker:' + config.model, removeHighlight( config.view ), { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n// Takes `config.view`, and if it is an {@link module:engine/view/elementdefinition~ElementDefinition}, converts it\n// to a function (because lower level converters accept only element creator functions).\n//\n// @param {module:engine/view/elementdefinition~ElementDefinition|Function} view View configuration.\n// @param {'container'|'attribute'|'ui'} viewElementType View element type to create.\n// @returns {Function} Element creator function to use in lower level converters.\nfunction _normalizeToElementConfig( view, viewElementType ) {\n\tif ( typeof view == 'function' ) {\n\t\t// If `view` is already a function, don't do anything.\n\t\treturn view;\n\t}\n\n\treturn ( modelData, viewWriter ) => _createViewElementFromDefinition( view, viewWriter, viewElementType );\n}\n\n// Creates a view element instance from the provided {@link module:engine/view/elementdefinition~ElementDefinition} and class.\n//\n// @param {module:engine/view/elementdefinition~ElementDefinition} viewElementDefinition\n// @param {module:engine/view/writer~Writer} viewWriter\n// @param {'container'|'attribute'|'ui'} viewElementType\n// @returns {module:engine/view/element~Element}\nfunction _createViewElementFromDefinition( viewElementDefinition, viewWriter, viewElementType ) {\n\tif ( typeof viewElementDefinition == 'string' ) {\n\t\t// If `viewElementDefinition` is given as a `String`, normalize it to an object with `name` property.\n\t\tviewElementDefinition = { name: viewElementDefinition };\n\t}\n\n\tlet element;\n\tconst attributes = Object.assign( {}, viewElementDefinition.attributes );\n\n\tif ( viewElementType == 'container' ) {\n\t\telement = viewWriter.createContainerElement( viewElementDefinition.name, attributes );\n\t} else if ( viewElementType == 'attribute' ) {\n\t\tconst options = {\n\t\t\tpriority: viewElementDefinition.priority || ViewAttributeElement.DEFAULT_PRIORITY\n\t\t};\n\n\t\telement = viewWriter.createAttributeElement( viewElementDefinition.name, attributes, options );\n\t} else {\n\t\t// 'ui'.\n\t\telement = viewWriter.createUIElement( viewElementDefinition.name, attributes );\n\t}\n\n\tif ( viewElementDefinition.styles ) {\n\t\tconst keys = Object.keys( viewElementDefinition.styles );\n\n\t\tfor ( const key of keys ) {\n\t\t\tviewWriter.setStyle( key, viewElementDefinition.styles[ key ], element );\n\t\t}\n\t}\n\n\tif ( viewElementDefinition.classes ) {\n\t\tconst classes = viewElementDefinition.classes;\n\n\t\tif ( typeof classes == 'string' ) {\n\t\t\tviewWriter.addClass( classes, element );\n\t\t} else {\n\t\t\tfor ( const className of classes ) {\n\t\t\t\tviewWriter.addClass( className, element );\n\t\t\t}\n\t\t}\n\t}\n\n\treturn element;\n}\n\nfunction _getFromAttributeCreator( config ) {\n\tif ( config.model.values ) {\n\t\treturn ( modelAttributeValue, viewWriter ) => {\n\t\t\tconst view = config.view[ modelAttributeValue ];\n\n\t\t\tif ( view ) {\n\t\t\t\treturn view( modelAttributeValue, viewWriter );\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\t} else {\n\t\treturn config.view;\n\t}\n}\n\n// Takes the configuration, adds default parameters if they do not exist and normalizes other parameters to be used in downcast converters\n// for generating a view attribute.\n//\n// @param {Object} view View configuration.\nfunction _normalizeToAttributeConfig( view ) {\n\tif ( typeof view == 'string' ) {\n\t\treturn modelAttributeValue => ( { key: view, value: modelAttributeValue } );\n\t} else if ( typeof view == 'object' ) {\n\t\t// { key, value, ... }\n\t\tif ( view.value ) {\n\t\t\treturn () => view;\n\t\t}\n\t\t// { key, ... }\n\t\telse {\n\t\t\treturn modelAttributeValue => ( { key: view.key, value: modelAttributeValue } );\n\t\t}\n\t} else {\n\t\t// function.\n\t\treturn view;\n\t}\n}\n\n/**\n * Function factory that creates a converter which converts node insertion changes from the model to the view.\n * The function passed will be provided with all the parameters of the dispatcher's\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert `insert` event}.\n * It is expected that the function returns an {@link module:engine/view/element~Element}.\n * The result of the function will be inserted into the view.\n *\n * The converter automatically consumes the corresponding value from the consumables list, stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}) and binds the model and view elements.\n *\n *\t\tdowncastDispatcher.on(\n *\t\t\t'insert:myElem',\n *\t\t\tinsertElement( ( modelItem, viewWriter ) => {\n *\t\t\t\tconst text = viewWriter.createText( 'myText' );\n *\t\t\t\tconst myElem = viewWriter.createElement( 'myElem', { myAttr: 'my-' + modelItem.getAttribute( 'myAttr' ) }, text );\n *\n *\t\t\t\t// Do something fancy with `myElem` using `modelItem` or other parameters.\n *\n *\t\t\t\treturn myElem;\n *\t\t\t}\n *\t\t) );\n *\n * @param {Function} elementCreator Function returning a view element, which will be inserted.\n * @returns {Function} Insert element event converter.\n */\nexport function insertElement( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewElement = elementCreator( data.item, conversionApi.writer );\n\n\t\tif ( !viewElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\n\t\tconversionApi.mapper.bindElements( data.item, viewElement );\n\t\tconversionApi.writer.insert( viewPosition, viewElement );\n\t};\n}\n\n/**\n * Function factory that creates a default downcast converter for text insertion changes.\n *\n * The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n *\n *\t\tmodelDispatcher.on( 'insert:$text', insertText() );\n *\n * @returns {Function} Insert text event converter.\n */\nexport function insertText() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !conversionApi.consumable.consume( data.item, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\t\tconst viewText = viewWriter.createText( data.item.data );\n\n\t\tviewWriter.insert( viewPosition, viewText );\n\t};\n}\n\n/**\n * Function factory that creates a default downcast converter for node remove changes.\n *\n *\t\tmodelDispatcher.on( 'remove', remove() );\n *\n * @returns {Function} Remove event converter.\n */\nexport function remove() {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Find view range start position by mapping model position at which the remove happened.\n\t\tconst viewStart = conversionApi.mapper.toViewPosition( data.position );\n\n\t\tconst modelEnd = data.position.getShiftedBy( data.length );\n\t\tconst viewEnd = conversionApi.mapper.toViewPosition( modelEnd, { isPhantom: true } );\n\n\t\tconst viewRange = new ViewRange( viewStart, viewEnd );\n\n\t\t// Trim the range to remove in case some UI elements are on the view range boundaries.\n\t\tconst removed = conversionApi.writer.remove( viewRange.getTrimmed() );\n\n\t\t// After the range is removed, unbind all view elements from the model.\n\t\t// Range inside view document fragment is used to unbind deeply.\n\t\tfor ( const child of ViewRange.createIn( removed ).getItems() ) {\n\t\t\tconversionApi.mapper.unbindViewElement( child );\n\t\t}\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts marker adding change to the\n * {@link module:engine/view/uielement~UIElement view UI element}.\n *\n * The view UI element that will be added to the view depends on the passed parameter. See {@link ~insertElement}.\n * In case of a non-collapsed range, the UI element will not wrap nodes but separate elements will be placed at the beginning\n * and at the end of the range.\n *\n * This converter binds created UI elements with the marker name using {@link module:engine/conversion/mapper~Mapper#bindElementToMarker}.\n *\n * @param {module:engine/view/uielement~UIElement|Function} elementCreator A view UI element or a function returning the view element\n * that will be inserted.\n * @returns {Function} Insert element event converter.\n */\nexport function insertUIElement( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Create two view elements. One will be inserted at the beginning of marker, one at the end.\n\t\t// If marker is collapsed, only \"opening\" element will be inserted.\n\t\tdata.isOpening = true;\n\t\tconst viewStartElement = elementCreator( data, conversionApi.writer );\n\n\t\tdata.isOpening = false;\n\t\tconst viewEndElement = elementCreator( data, conversionApi.writer );\n\n\t\tif ( !viewStartElement || !viewEndElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst markerRange = data.markerRange;\n\n\t\t// Marker that is collapsed has consumable build differently that non-collapsed one.\n\t\t// For more information see `addMarker` event description.\n\t\t// If marker's range is collapsed - check if it can be consumed.\n\t\tif ( markerRange.isCollapsed && !conversionApi.consumable.consume( markerRange, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If marker's range is not collapsed - consume all items inside.\n\t\tfor ( const value of markerRange ) {\n\t\t\tif ( !conversionApi.consumable.consume( value.item, evt.name ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\tconst mapper = conversionApi.mapper;\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\t// Add \"opening\" element.\n\t\tviewWriter.insert( mapper.toViewPosition( markerRange.start ), viewStartElement );\n\t\tconversionApi.mapper.bindElementToMarker( viewStartElement, data.markerName );\n\n\t\t// Add \"closing\" element only if range is not collapsed.\n\t\tif ( !markerRange.isCollapsed ) {\n\t\t\tviewWriter.insert( mapper.toViewPosition( markerRange.end ), viewEndElement );\n\t\t\tconversionApi.mapper.bindElementToMarker( viewEndElement, data.markerName );\n\t\t}\n\n\t\tevt.stop();\n\t};\n}\n\n/**\n * Function factory that returns a default downcast converter for removing a {@link module:engine/view/uielement~UIElement UI element}\n * basing on marker remove change.\n *\n * This converter unbinds elements from the marker name.\n *\n * @returns {Function} Removed UI element converter.\n */\nexport function removeUIElement() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst elements = conversionApi.mapper.markerNameToElements( data.markerName );\n\n\t\tif ( !elements ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconversionApi.mapper.unbindElementsFromMarkerName( data.markerName );\n\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\tfor ( const element of elements ) {\n\t\t\tviewWriter.clear( ViewRange.createOn( element ), element );\n\t\t}\n\n\t\tevt.stop();\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts set/change/remove attribute changes from the model to the view.\n *\n * Attributes from the model are converted to the view element attributes in the view. You may provide a custom function to generate\n * a key-value attribute pair to add/change/remove. If not provided, model attributes will be converted to view element\n * attributes on a one-to-one basis.\n *\n * **Note:** The provided attribute creator should always return the same `key` for a given attribute from the model.\n *\n * The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n *\n *\t\tmodelDispatcher.on( 'attribute:customAttr:myElem', changeAttribute( ( value, data ) => {\n *\t\t\t// Change attribute key from `customAttr` to `class` in the view.\n *\t\t\tconst key = 'class';\n *\t\t\tlet value = data.attributeNewValue;\n *\n *\t\t\t// Force attribute value to 'empty' if the model element is empty.\n *\t\t\tif ( data.item.childCount === 0 ) {\n *\t\t\t\tvalue = 'empty';\n *\t\t\t}\n *\n *\t\t\t// Return the key-value pair.\n *\t\t\treturn { key, value };\n *\t\t} ) );\n *\n * @param {Function} [attributeCreator] Function returning an object with two properties: `key` and `value`, which\n * represent the attribute key and attribute value to be set on a {@link module:engine/view/element~Element view element}.\n * The function is passed the model attribute value as the first parameter and additional data about the change as the second parameter.\n * @returns {Function} Set/change attribute converter.\n */\nexport function changeAttribute( attributeCreator ) {\n\tattributeCreator = attributeCreator || ( ( value, data ) => ( { value, key: data.attributeKey } ) );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst oldAttribute = attributeCreator( data.attributeOldValue, data );\n\t\tconst newAttribute = attributeCreator( data.attributeNewValue, data );\n\n\t\tif ( !oldAttribute && !newAttribute ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\t// First remove the old attribute if there was one.\n\t\tif ( data.attributeOldValue !== null && oldAttribute ) {\n\t\t\tif ( oldAttribute.key == 'class' ) {\n\t\t\t\tconst classes = Array.isArray( oldAttribute.value ) ? oldAttribute.value : [ oldAttribute.value ];\n\n\t\t\t\tfor ( const className of classes ) {\n\t\t\t\t\tviewWriter.removeClass( className, viewElement );\n\t\t\t\t}\n\t\t\t} else if ( oldAttribute.key == 'style' ) {\n\t\t\t\tconst keys = Object.keys( oldAttribute.value );\n\n\t\t\t\tfor ( const key of keys ) {\n\t\t\t\t\tviewWriter.removeStyle( key, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tviewWriter.removeAttribute( oldAttribute.key, viewElement );\n\t\t\t}\n\t\t}\n\n\t\t// Then set the new attribute.\n\t\tif ( data.attributeNewValue !== null && newAttribute ) {\n\t\t\tif ( newAttribute.key == 'class' ) {\n\t\t\t\tconst classes = Array.isArray( newAttribute.value ) ? newAttribute.value : [ newAttribute.value ];\n\n\t\t\t\tfor ( const className of classes ) {\n\t\t\t\t\tviewWriter.addClass( className, viewElement );\n\t\t\t\t}\n\t\t\t} else if ( newAttribute.key == 'style' ) {\n\t\t\t\tconst keys = Object.keys( newAttribute.value );\n\n\t\t\t\tfor ( const key of keys ) {\n\t\t\t\t\tviewWriter.setStyle( key, newAttribute.value[ key ], viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tviewWriter.setAttribute( newAttribute.key, newAttribute.value, viewElement );\n\t\t\t}\n\t\t}\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts set/change/remove attribute changes from the model to the view.\n * It can also be used to convert selection attributes. In that case, an empty attribute element will be created and the\n * selection will be put inside it.\n *\n * Attributes from the model are converted to a view element that will be wrapping these view nodes that are bound to\n * model elements having the given attribute. This is useful for attributes like `bold` that may be set on text nodes in the model\n * but are represented as an element in the view:\n *\n *\t\t[paragraph]              MODEL ====> VIEW        <p>\n *\t\t\t|- a {bold: true}                             |- <b>\n *\t\t\t|- b {bold: true}                             |   |- ab\n *\t\t\t|- c                                          |- c\n *\n * Passed `Function` will be provided with the attribute value and then all the parameters of the\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute `attribute` event}.\n * It is expected that the function returns an {@link module:engine/view/element~Element}.\n * The result of the function will be the wrapping element.\n * When the provided `Function` does not return any element, no conversion will take place.\n *\n * The converter automatically consumes the corresponding value from the consumables list and stops the event (see\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher}).\n *\n *\t\tmodelDispatcher.on( 'attribute:bold', wrapItem( ( modelAttributeValue, viewWriter ) => {\n *\t\t\treturn viewWriter.createAttributeElement( 'strong' );\n *\t\t} );\n *\n * @param {Function} elementCreator Function returning a view element that will be used for wrapping.\n * @returns {Function} Set/change attribute converter.\n */\nexport function wrap( elementCreator ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Recreate current wrapping node. It will be used to unwrap view range if the attribute value has changed\n\t\t// or the attribute was removed.\n\t\tconst oldViewElement = elementCreator( data.attributeOldValue, conversionApi.writer );\n\n\t\t// Create node to wrap with.\n\t\tconst newViewElement = elementCreator( data.attributeNewValue, conversionApi.writer );\n\n\t\tif ( !oldViewElement && !newViewElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tif ( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) {\n\t\t\t// Selection attribute conversion.\n\t\t\tviewWriter.wrap( viewSelection.getFirstRange(), newViewElement );\n\t\t} else {\n\t\t\t// Node attribute conversion.\n\t\t\tlet viewRange = conversionApi.mapper.toViewRange( data.range );\n\n\t\t\t// First, unwrap the range from current wrapper.\n\t\t\tif ( data.attributeOldValue !== null && oldViewElement ) {\n\t\t\t\tviewRange = viewWriter.unwrap( viewRange, oldViewElement );\n\t\t\t}\n\n\t\t\tif ( data.attributeNewValue !== null && newViewElement ) {\n\t\t\t\tviewWriter.wrap( viewRange, newViewElement );\n\t\t\t}\n\t\t}\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts the text inside marker's range. The converter wraps the text with\n * {@link module:engine/view/attributeelement~AttributeElement} created from the provided descriptor.\n * See {link module:engine/conversion/downcast-converters~createViewElementFromHighlightDescriptor}.\n *\n * It can also be used to convert the selection that is inside a marker. In that case, an empty attribute element will be\n * created and the selection will be put inside it.\n *\n * If the highlight descriptor does not provide the `priority` property, `10` will be used.\n *\n * If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n *\n * This converter binds the created {@link module:engine/view/attributeelement~AttributeElement attribute elemens} with the marker name\n * using the {@link module:engine/conversion/mapper~Mapper#bindElementToMarker} method.\n *\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor|Function} highlightDescriptor\n * @returns {Function}\n */\nexport function highlightText( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( data.markerRange.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) && !data.item.is( 'textProxy' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = _prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewElement = createViewElementFromHighlightDescriptor( descriptor );\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tif ( data.item instanceof ModelSelection || data.item instanceof DocumentSelection ) {\n\t\t\tviewWriter.wrap( viewSelection.getFirstRange(), viewElement, viewSelection );\n\t\t} else {\n\t\t\tconst viewRange = conversionApi.mapper.toViewRange( data.range );\n\t\t\tconst rangeAfterWrap = viewWriter.wrap( viewRange, viewElement );\n\n\t\t\tfor ( const element of rangeAfterWrap.getItems() ) {\n\t\t\t\tif ( element.is( 'attributeElement' ) && element.isSimilar( viewElement ) ) {\n\t\t\t\t\tconversionApi.mapper.bindElementToMarker( element, data.markerName );\n\n\t\t\t\t\t// One attribute element is enough, because all of them are bound together by the view writer.\n\t\t\t\t\t// Mapper uses this binding to get all the elements no matter how many of them are registered in the mapper.\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t};\n}\n\n/**\n * Converter function factory. It creates a function which applies the marker's highlight to an element inside the marker's range.\n *\n * The converter checks if an element has the `addHighlight` function stored as a\n * {@link module:engine/view/element~Element#_setCustomProperty custom property} and, if so, uses it to apply the highlight.\n * In such case the converter will consume all element's children, assuming that they were handled by the element itself.\n *\n * When the `addHighlight` custom property is not present, the element is not converted in any special way.\n * This means that converters will proceed to convert the element's child nodes.\n *\n * If the highlight descriptor does not provide the `priority` property, `10` will be used.\n *\n * If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n *\n * This converter binds altered {@link module:engine/view/containerelement~ContainerElement container elements} with the marker name using\n * the {@link module:engine/conversion/mapper~Mapper#bindElementToMarker} method.\n *\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor|Function} highlightDescriptor\n * @returns {Function}\n */\nexport function highlightElement( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( data.markerRange.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !( data.item instanceof ModelElement ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = _prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.test( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\n\t\tif ( viewElement && viewElement.getCustomProperty( 'addHighlight' ) ) {\n\t\t\t// Consume element itself.\n\t\t\tconversionApi.consumable.consume( data.item, evt.name );\n\n\t\t\t// Consume all children nodes.\n\t\t\tfor ( const value of ModelRange.createIn( data.item ) ) {\n\t\t\t\tconversionApi.consumable.consume( value.item, evt.name );\n\t\t\t}\n\n\t\t\tviewElement.getCustomProperty( 'addHighlight' )( viewElement, descriptor, conversionApi.writer );\n\n\t\t\tconversionApi.mapper.bindElementToMarker( viewElement, data.markerName );\n\t\t}\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts the removing model marker to the view.\n *\n * Both text nodes and elements are handled by this converter but they are handled a bit differently.\n *\n * Text nodes are unwrapped using the {@link module:engine/view/attributeelement~AttributeElement attribute element} created from the\n * provided highlight descriptor. See {link module:engine/conversion/downcast-converters~HighlightDescriptor}.\n *\n * For elements, the converter checks if an element has the `removeHighlight` function stored as a\n * {@link module:engine/view/element~Element#_setCustomProperty custom property}. If so, it uses it to remove the highlight.\n * In such case, the children of that element will not be converted.\n *\n * When `removeHighlight` is not present, the element is not converted in any special way.\n * The converter will proceed to convert the element's child nodes instead.\n *\n * If the highlight descriptor does not provide the `priority` property, `10` will be used.\n *\n * If the highlight descriptor does not provide the `id` property, the name of the marker will be used.\n *\n * This converter unbinds elements from the marker name.\n *\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor|Function} highlightDescriptor\n * @returns {Function}\n */\nexport function removeHighlight( highlightDescriptor ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// This conversion makes sense only for non-collapsed range.\n\t\tif ( data.markerRange.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst descriptor = _prepareDescriptor( highlightDescriptor, data, conversionApi );\n\n\t\tif ( !descriptor ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// View element that will be used to unwrap `AttributeElement`s.\n\t\tconst viewHighlightElement = createViewElementFromHighlightDescriptor( descriptor );\n\n\t\t// Get all elements bound with given marker name.\n\t\tconst elements = conversionApi.mapper.markerNameToElements( data.markerName );\n\n\t\tif ( !elements ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconversionApi.mapper.unbindElementsFromMarkerName( data.markerName );\n\n\t\tfor ( const element of elements ) {\n\t\t\tif ( element.is( 'attributeElement' ) ) {\n\t\t\t\tconversionApi.writer.unwrap( ViewRange.createOn( element ), viewHighlightElement );\n\t\t\t} else {\n\t\t\t\t// if element.is( 'containerElement' ).\n\t\t\t\telement.getCustomProperty( 'removeHighlight' )( element, descriptor.id, conversionApi.writer );\n\t\t\t}\n\t\t}\n\n\t\tevt.stop();\n\t};\n}\n\n// Helper function for `highlight`. Prepares the actual descriptor object using value passed to the converter.\nfunction _prepareDescriptor( highlightDescriptor, data, conversionApi ) {\n\t// If passed descriptor is a creator function, call it. If not, just use passed value.\n\tconst descriptor = typeof highlightDescriptor == 'function' ?\n\t\thighlightDescriptor( data, conversionApi ) :\n\t\thighlightDescriptor;\n\n\tif ( !descriptor ) {\n\t\treturn null;\n\t}\n\n\t// Apply default descriptor priority.\n\tif ( !descriptor.priority ) {\n\t\tdescriptor.priority = 10;\n\t}\n\n\t// Default descriptor id is marker name.\n\tif ( !descriptor.id ) {\n\t\tdescriptor.id = data.markerName;\n\t}\n\n\treturn descriptor;\n}\n\n/**\n * Creates a `<span>` {@link module:engine/view/attributeelement~AttributeElement view attribute element} from the information\n * provided by the {@link module:engine/conversion/downcast-converters~HighlightDescriptor highlight descriptor} object. If a priority\n * is not provided in the descriptor, the default priority will be used.\n *\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor} descriptor\n * @returns {module:engine/view/attributeelement~AttributeElement}\n */\nexport function createViewElementFromHighlightDescriptor( descriptor ) {\n\tconst viewElement = new ViewAttributeElement( 'span', descriptor.attributes );\n\n\tif ( descriptor.classes ) {\n\t\tviewElement._addClass( descriptor.classes );\n\t}\n\n\tif ( descriptor.priority ) {\n\t\tviewElement._priority = descriptor.priority;\n\t}\n\n\tviewElement._id = descriptor.id;\n\n\treturn viewElement;\n}\n\n/**\n * An object describing how the marker highlight should be represented in the view.\n *\n * Each text node contained in a highlighted range will be wrapped in a `<span>`\n * {@link module:engine/view/attributeelement~AttributeElement view attribute element} with CSS class(es), attributes and a priority\n * described by this object.\n *\n * Additionally, each {@link module:engine/view/containerelement~ContainerElement container element} can handle displaying the highlight\n * separately by providing the `addHighlight` and `removeHighlight` custom properties. In this case:\n *\n *  * The `HighlightDescriptor` object is passed to the `addHighlight` function upon conversion and should be used to apply the highlight to\n *  the element.\n *  * The descriptor `id` is passed to the `removeHighlight` function upon conversion and should be used to remove the highlight with the\n *  given ID from the element.\n *\n * @typedef {Object} module:engine/conversion/downcast-converters~HighlightDescriptor\n *\n * @property {String|Array.<String>} classes A CSS class or an array of classes to set. If the descriptor is used to\n * create an {@link module:engine/view/attributeelement~AttributeElement attribute element} over text nodes, these classes will be set\n * on that attribute element. If the descriptor is applied to an element, usually these classes will be set on that element, however,\n * this depends on how the element converts the descriptor.\n *\n * @property {String} [id] Descriptor identifier. If not provided, it defaults to the converted marker's name.\n *\n * @property {Number} [priority] Descriptor priority. If not provided, it defaults to `10`. If the descriptor is used to create\n * an {@link module:engine/view/attributeelement~AttributeElement attribute element}, it will be that element's\n * {@link module:engine/view/attributeelement~AttributeElement#priority priority}. If the descriptor is applied to an element,\n * the priority will be used to determine which descriptor is more important.\n *\n * @property {Object} [attributes] Attributes to set. If the descriptor is used to create\n * an {@link module:engine/view/attributeelement~AttributeElement attribute element} over text nodes, these attributes will be set on that\n * attribute element. If the descriptor is applied to an element, usually these attributes will be set on that element, however,\n * this depends on how the element converts the descriptor.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/controller/editingcontroller\n */\n\nimport RootEditableElement from '../view/rooteditableelement';\nimport View from '../view/view';\nimport Mapper from '../conversion/mapper';\nimport DowncastDispatcher from '../conversion/downcastdispatcher';\nimport { insertText, remove } from '../conversion/downcast-converters';\nimport { convertSelectionChange } from '../conversion/upcast-selection-converters';\nimport { clearAttributes, convertCollapsedSelection, convertRangeSelection } from '../conversion/downcast-selection-converters';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Controller for the editing pipeline. The editing pipeline controls {@link ~EditingController#model model} rendering,\n * including selection handling. It also creates the {@link ~EditingController#view view} which builds a\n * browser-independent virtualization over the DOM elements. The editing controller also attaches default converters.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditingController {\n\t/**\n\t * Creates an editing controller instance.\n\t *\n\t * @param {module:engine/model/model~Model} model Editing model.\n\t */\n\tconstructor( model ) {\n\t\t/**\n\t\t * Editor model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Editing view controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/view~View}\n\t\t */\n\t\tthis.view = new View();\n\n\t\t/**\n\t\t * Mapper which describes the model-view binding.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/mapper~Mapper}\n\t\t */\n\t\tthis.mapper = new Mapper();\n\n\t\t/**\n\t\t * Downcast dispatcher that converts changes from the model to {@link #view the editing view}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/downcastdispatcher~DowncastDispatcher} #downcastDispatcher\n\t\t */\n\t\tthis.downcastDispatcher = new DowncastDispatcher( {\n\t\t\tmapper: this.mapper\n\t\t} );\n\n\t\tconst doc = this.model.document;\n\t\tconst selection = doc.selection;\n\t\tconst markers = this.model.markers;\n\n\t\t// Whenever model document is changed, convert those changes to the view (using model.Document#differ).\n\t\t// Do it on 'low' priority, so changes are converted after other listeners did their job.\n\t\t// Also convert model selection.\n\t\tthis.listenTo( doc, 'change', () => {\n\t\t\tthis.view.change( writer => {\n\t\t\t\tthis.downcastDispatcher.convertChanges( doc.differ, writer );\n\t\t\t\tthis.downcastDispatcher.convertSelection( selection, markers, writer );\n\t\t\t} );\n\t\t}, { priority: 'low' } );\n\n\t\t// Convert selection from the view to the model when it changes in the view.\n\t\tthis.listenTo( this.view.document, 'selectionChange', convertSelectionChange( this.model, this.mapper ) );\n\n\t\t// Attach default model converters.\n\t\tthis.downcastDispatcher.on( 'insert:$text', insertText(), { priority: 'lowest' } );\n\t\tthis.downcastDispatcher.on( 'remove', remove(), { priority: 'low' } );\n\n\t\t// Attach default model selection converters.\n\t\tthis.downcastDispatcher.on( 'selection', clearAttributes(), { priority: 'low' } );\n\t\tthis.downcastDispatcher.on( 'selection', convertRangeSelection(), { priority: 'low' } );\n\t\tthis.downcastDispatcher.on( 'selection', convertCollapsedSelection(), { priority: 'low' } );\n\n\t\t// Binds {@link module:engine/view/document~Document#roots view roots collection} to\n\t\t// {@link module:engine/model/document~Document#roots model roots collection} so creating\n\t\t// model root automatically creates corresponding view root.\n\t\tthis.view.document.roots.bindTo( this.model.document.roots ).using( root => {\n\t\t\t// $graveyard is a special root that has no reflection in the view.\n\t\t\tif ( root.rootName == '$graveyard' ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewRoot = new RootEditableElement( root.name );\n\n\t\t\tviewRoot.rootName = root.rootName;\n\t\t\tviewRoot._document = this.view.document;\n\t\t\tthis.mapper.bindElements( root, viewRoot );\n\n\t\t\treturn viewRoot;\n\t\t} );\n\t}\n\n\t/**\n\t * Removes all event listeners attached to the `EditingController`. Destroys all objects created\n\t * by `EditingController` that need to be destroyed.\n\t */\n\tdestroy() {\n\t\tthis.view.destroy();\n\t\tthis.stopListening();\n\t}\n}\n\nmix( EditingController, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * Contains {@link module:engine/view/documentselection~DocumentSelection view selection}\n * to {@link module:engine/model/selection~Selection model selection} conversion helpers.\n *\n * @module engine/conversion/upcast-selection-converters\n */\n\nimport ModelSelection from '../model/selection';\n\n/**\n * Function factory, creates a callback function which converts a {@link module:engine/view/selection~Selection\n * view selection} taken from the {@link module:engine/view/document~Document#event:selectionChange} event\n * and sets in on the {@link module:engine/model/document~Document#selection model}.\n *\n * **Note**: because there is no view selection change dispatcher nor any other advanced view selection to model\n * conversion mechanism, the callback should be set directly on view document.\n *\n *\t\tview.document.on( 'selectionChange', convertSelectionChange( modelDocument, mapper ) );\n *\n * @param {module:engine/model/model~Model} model Data model.\n * @param {module:engine/conversion/mapper~Mapper} mapper Conversion mapper.\n * @returns {Function} {@link module:engine/view/document~Document#event:selectionChange} callback function.\n */\nexport function convertSelectionChange( model, mapper ) {\n\treturn ( evt, data ) => {\n\t\tconst viewSelection = data.newSelection;\n\t\tconst modelSelection = new ModelSelection();\n\n\t\tconst ranges = [];\n\n\t\tfor ( const viewRange of viewSelection.getRanges() ) {\n\t\t\tranges.push( mapper.toModelRange( viewRange ) );\n\t\t}\n\n\t\tmodelSelection.setTo( ranges, { backward: viewSelection.isBackward } );\n\n\t\tif ( !modelSelection.isEqual( model.document.selection ) ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\twriter.setSelection( modelSelection );\n\t\t\t} );\n\t\t}\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * Contains {@link module:engine/model/selection~Selection model selection} to\n * {@link module:engine/view/documentselection~DocumentSelection view selection} converters for\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher downcast dispatcher}.\n *\n * @module engine/conversion/downcast-selection-converters\n */\n\n/**\n * Function factory that creates a converter which converts a non-collapsed {@link module:engine/model/selection~Selection model selection}\n * to a {@link module:engine/view/documentselection~DocumentSelection view selection}. The converter consumes appropriate\n * value from the `consumable` object and maps model positions from the selection to view positions.\n *\n *\t\tmodelDispatcher.on( 'selection', convertRangeSelection() );\n *\n * @returns {Function} Selection converter.\n */\nexport function convertRangeSelection() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst selection = data.selection;\n\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( selection, 'selection' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( const range of selection.getRanges() ) {\n\t\t\tconst viewRange = conversionApi.mapper.toViewRange( range );\n\t\t\tviewRanges.push( viewRange );\n\t\t}\n\n\t\tconversionApi.writer.setSelection( viewRanges, { backward: selection.isBackward } );\n\t};\n}\n\n/**\n * Function factory that creates a converter which converts a collapsed {@link module:engine/model/selection~Selection model selection} to\n * a {@link module:engine/view/documentselection~DocumentSelection view selection}. The converter consumes appropriate\n * value from the `consumable` object, maps the model selection position to the view position and breaks\n * {@link module:engine/view/attributeelement~AttributeElement attribute elements} at the selection position.\n *\n *\t\tmodelDispatcher.on( 'selection', convertCollapsedSelection() );\n *\n * An example of the view state before and after converting the collapsed selection:\n *\n *\t\t   <p><strong>f^oo<strong>bar</p>\n *\t\t-> <p><strong>f</strong>^<strong>oo</strong>bar</p>\n *\n * By breaking attribute elements like `<strong>`, the selection is in a correct element. Then, when the selection attribute is\n * converted, broken attributes might be merged again, or the position where the selection is may be wrapped\n * with different, appropriate attribute elements.\n *\n * See also {@link module:engine/conversion/downcast-selection-converters~clearAttributes} which does a clean-up\n * by merging attributes.\n *\n * @returns {Function} Selection converter.\n */\nexport function convertCollapsedSelection() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst selection = data.selection;\n\n\t\tif ( !selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( !conversionApi.consumable.consume( selection, 'selection' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst modelPosition = selection.getFirstPosition();\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( modelPosition );\n\t\tconst brokenPosition = viewWriter.breakAttributes( viewPosition );\n\n\t\tviewWriter.setSelection( brokenPosition );\n\t};\n}\n\n/**\n * Function factory that creates a converter which clears artifacts after the previous\n * {@link module:engine/model/selection~Selection model selection} conversion. It removes all empty\n * {@link module:engine/view/attributeelement~AttributeElement view attribute elements} and merges sibling attributes at all start and end\n * positions of all ranges.\n *\n *\t\t   <p><strong>^</strong></p>\n *\t\t-> <p>^</p>\n *\n *\t\t   <p><strong>foo</strong>^<strong>bar</strong>bar</p>\n *\t\t-> <p><strong>foo^bar<strong>bar</p>\n *\n *\t\t   <p><strong>foo</strong><em>^</em><strong>bar</strong>bar</p>\n *\t\t-> <p><strong>foo^bar<strong>bar</p>\n *\n * This listener should be assigned before any converter for the new selection:\n *\n *\t\tmodelDispatcher.on( 'selection', clearAttributes() );\n *\n * See {@link module:engine/conversion/downcast-selection-converters~convertCollapsedSelection}\n * which does the opposite by breaking attributes in the selection position.\n *\n * @returns {Function} Selection converter.\n */\nexport function clearAttributes() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst viewSelection = viewWriter.document.selection;\n\n\t\tfor ( const range of viewSelection.getRanges() ) {\n\t\t\t// Not collapsed selection should not have artifacts.\n\t\t\tif ( range.isCollapsed ) {\n\t\t\t\t// Position might be in the node removed by the view writer.\n\t\t\t\tif ( range.end.parent.document ) {\n\t\t\t\t\tconversionApi.writer.mergeAttributes( range.start );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\tviewWriter.setSelection( null );\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/plugincollection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\n\n/**\n * Manages a list of CKEditor plugins, including loading, resolving dependencies and initialization.\n */\nexport default class PluginCollection {\n\t/**\n\t * Creates an instance of the PluginCollection class.\n\t * Allows loading and initializing plugins and their dependencies.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {Array.<Function>} [availablePlugins] Plugins (constructors) which the collection will be able to use\n\t * when {@link module:core/plugincollection~PluginCollection#load} is used with plugin names (strings, instead of constructors).\n\t * Usually, the editor will pass its built-in plugins to the collection so they can later be\n\t * used in `config.plugins` or `config.removePlugins` by names.\n\t */\n\tconstructor( editor, availablePlugins = [] ) {\n\t\t/**\n\t\t * @protected\n\t\t * @member {module:core/editor/editor~Editor} module:core/plugin~PluginCollection#_editor\n\t\t */\n\t\tthis._editor = editor;\n\n\t\t/**\n\t\t * Map of plugin constructors which can be retrieved by their names.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map.<String|Function,Function>} module:core/plugin~PluginCollection#_availablePlugins\n\t\t */\n\t\tthis._availablePlugins = new Map();\n\n\t\t/**\n\t\t * @protected\n\t\t * @member {Map} module:core/plugin~PluginCollection#_plugins\n\t\t */\n\t\tthis._plugins = new Map();\n\n\t\tfor ( const PluginConstructor of availablePlugins ) {\n\t\t\tthis._availablePlugins.set( PluginConstructor, PluginConstructor );\n\n\t\t\tif ( PluginConstructor.pluginName ) {\n\t\t\t\tthis._availablePlugins.set( PluginConstructor.pluginName, PluginConstructor );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Returns `[ PluginConstructor, pluginInstance ]` pairs.\n\t *\n\t * @returns {Iterable.<Array>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tfor ( const entry of this._plugins ) {\n\t\t\tif ( typeof entry[ 0 ] == 'function' ) {\n\t\t\t\tyield entry;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Gets the plugin instance by its constructor or name.\n\t *\n\t * @param {Function|String} key The plugin constructor or {@link module:core/plugin~PluginInterface.pluginName name}.\n\t * @returns {module:core/plugin~PluginInterface}\n\t */\n\tget( key ) {\n\t\treturn this._plugins.get( key );\n\t}\n\n\t/**\n\t * Loads a set of plugins and adds them to the collection.\n\t *\n\t * @param {Array.<Function|String>} plugins An array of {@link module:core/plugin~PluginInterface plugin constructors}\n\t * or {@link module:core/plugin~PluginInterface.pluginName plugin names}. The second option (names) works only if\n\t * `availablePlugins` were passed to the {@link #constructor}.\n\t * @param {Array.<String|Function>} [removePlugins] Names of plugins or plugin constructors\n\t * that should not be loaded (despite being specified in the `plugins` array).\n\t * @returns {Promise} A promise which gets resolved once all plugins are loaded and available in the\n\t * collection.\n\t * @returns {Promise.<Array.<module:core/plugin~PluginInterface>>} returns.loadedPlugins The array of loaded plugins.\n\t */\n\tload( plugins, removePlugins = [] ) {\n\t\tconst that = this;\n\t\tconst editor = this._editor;\n\t\tconst loading = new Set();\n\t\tconst loaded = [];\n\n\t\tconst pluginConstructors = mapToAvailableConstructors( plugins );\n\t\tconst removePluginConstructors = mapToAvailableConstructors( removePlugins );\n\t\tconst missingPlugins = getMissingPluginNames( plugins );\n\n\t\tif ( missingPlugins ) {\n\t\t\t/**\n\t\t\t * Some plugins are not available and could not be loaded.\n\t\t\t *\n\t\t\t * Plugin classes (constructors) need to be provided to the editor before they can be loaded by name.\n\t\t\t * This is usually done in CKEditor 5 builds by setting the {@link module:core/editor/editor~Editor.builtinPlugins}\n\t\t\t * property.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the {@glink builds/index CKEditor 5 Builds}**, it means\n\t\t\t * that you try to enable a plugin which was not included in that build. This may be due to a typo\n\t\t\t * in the plugin name or simply because that plugin is not a part of this build. In the latter scenario,\n\t\t\t * read more about {@glink builds/guides/development/custom-builds custom builds}.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the editor creators directly** (not a build), then it means\n\t\t\t * that you tried loading plugins by name. However, unlike CKEditor 4, CKEditor 5 does not implement a \"plugin loader\".\n\t\t\t * This means that CKEditor 5 does not know where to load the plugin modules from. Therefore, you need to\n\t\t\t * provide each plugin through reference (as a constructor function). Check out the examples in\n\t\t\t * {@glink builds/guides/integration/advanced-setup#scenario-2-building-from-source \"Building from source\"}.\n\t\t\t *\n\t\t\t * @error plugincollection-plugin-not-found\n\t\t\t * @param {Array.<String>} plugins The name of the plugins which could not be loaded.\n\t\t\t */\n\t\t\tconst errorMsg = 'plugincollection-plugin-not-found: Some plugins are not available and could not be loaded.';\n\n\t\t\t// Log the error so it's more visible on the console. Hopefully, for better DX.\n\t\t\tlog.error( errorMsg, { plugins: missingPlugins } );\n\n\t\t\treturn Promise.reject( new CKEditorError( errorMsg, { plugins: missingPlugins } ) );\n\t\t}\n\n\t\treturn Promise.all( pluginConstructors.map( loadPlugin ) )\n\t\t\t.then( () => loaded );\n\n\t\tfunction loadPlugin( PluginConstructor ) {\n\t\t\tif ( removePluginConstructors.includes( PluginConstructor ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// The plugin is already loaded or being loaded - do nothing.\n\t\t\tif ( that.get( PluginConstructor ) || loading.has( PluginConstructor ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\treturn instantiatePlugin( PluginConstructor )\n\t\t\t\t.catch( err => {\n\t\t\t\t\t/**\n\t\t\t\t\t * It was not possible to load the plugin.\n\t\t\t\t\t *\n\t\t\t\t\t * This is a generic error logged to the console when a JavaSript error is thrown during the initialization\n\t\t\t\t\t * of one of the plugins.\n\t\t\t\t\t *\n\t\t\t\t\t * If you correctly handled the promise returned by the editor's `create()` method (like shown below)\n\t\t\t\t\t * you will find the original error logged to the console, too:\n\t\t\t\t\t *\n\t\t\t\t\t *\t\tClassicEditor.create( document.getElementById( 'editor' ) )\n\t\t\t\t\t *\t\t\t.then( editor => {\n\t\t\t\t\t *\t\t\t\t// ...\n\t\t\t\t\t * \t\t\t} )\n\t\t\t\t\t *\t\t\t.catch( error => {\n\t\t\t\t\t *\t\t\t\tconsole.error( error );\n\t\t\t\t\t *\t\t\t} );\n\t\t\t\t\t *\n\t\t\t\t\t * @error plugincollection-load\n\t\t\t\t\t * @param {String} plugin The name of the plugin that could not be loaded.\n\t\t\t\t\t */\n\t\t\t\t\tlog.error( 'plugincollection-load: It was not possible to load the plugin.', { plugin: PluginConstructor } );\n\n\t\t\t\t\tthrow err;\n\t\t\t\t} );\n\t\t}\n\n\t\tfunction instantiatePlugin( PluginConstructor ) {\n\t\t\treturn new Promise( resolve => {\n\t\t\t\tloading.add( PluginConstructor );\n\n\t\t\t\tif ( PluginConstructor.requires ) {\n\t\t\t\t\tPluginConstructor.requires.forEach( RequiredPluginConstructorOrName => {\n\t\t\t\t\t\tconst RequiredPluginConstructor = getPluginConstructor( RequiredPluginConstructorOrName );\n\n\t\t\t\t\t\tif ( removePlugins.includes( RequiredPluginConstructor ) ) {\n\t\t\t\t\t\t\t/**\n\t\t\t\t\t\t\t * Cannot load a plugin because one of its dependencies is listed in the `removePlugins` option.\n\t\t\t\t\t\t\t *\n\t\t\t\t\t\t\t * @error plugincollection-required\n\t\t\t\t\t\t\t * @param {Function} plugin The required plugin.\n\t\t\t\t\t\t\t * @param {Function} requiredBy The parent plugin.\n\t\t\t\t\t\t\t */\n\t\t\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t\t\t'plugincollection-required: Cannot load a plugin because one of its dependencies is listed in' +\n\t\t\t\t\t\t\t\t'the `removePlugins` option.',\n\t\t\t\t\t\t\t\t{ plugin: RequiredPluginConstructor, requiredBy: PluginConstructor }\n\t\t\t\t\t\t\t);\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tloadPlugin( RequiredPluginConstructor );\n\t\t\t\t\t} );\n\t\t\t\t}\n\n\t\t\t\tconst plugin = new PluginConstructor( editor );\n\t\t\t\tthat._add( PluginConstructor, plugin );\n\t\t\t\tloaded.push( plugin );\n\n\t\t\t\tresolve();\n\t\t\t} );\n\t\t}\n\n\t\tfunction getPluginConstructor( PluginConstructorOrName ) {\n\t\t\tif ( typeof PluginConstructorOrName == 'function' ) {\n\t\t\t\treturn PluginConstructorOrName;\n\t\t\t}\n\n\t\t\treturn that._availablePlugins.get( PluginConstructorOrName );\n\t\t}\n\n\t\tfunction getMissingPluginNames( plugins ) {\n\t\t\tconst missingPlugins = [];\n\n\t\t\tfor ( const pluginNameOrConstructor of plugins ) {\n\t\t\t\tif ( !getPluginConstructor( pluginNameOrConstructor ) ) {\n\t\t\t\t\tmissingPlugins.push( pluginNameOrConstructor );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn missingPlugins.length ? missingPlugins : null;\n\t\t}\n\n\t\tfunction mapToAvailableConstructors( plugins ) {\n\t\t\treturn plugins\n\t\t\t\t.map( pluginNameOrConstructor => getPluginConstructor( pluginNameOrConstructor ) )\n\t\t\t\t.filter( PluginConstructor => !!PluginConstructor );\n\t\t}\n\t}\n\n\t/**\n\t * Destroys all loaded plugins.\n\t *\n\t * @returns {Promise}\n\t */\n\tdestroy() {\n\t\tconst promises = Array.from( this )\n\t\t\t.map( ( [ , pluginInstance ] ) => pluginInstance )\n\t\t\t.filter( pluginInstance => typeof pluginInstance.destroy == 'function' )\n\t\t\t.map( pluginInstance => pluginInstance.destroy() );\n\n\t\treturn Promise.all( promises );\n\t}\n\n\t/**\n\t * Adds the plugin to the collection. Exposed mainly for testing purposes.\n\t *\n\t * @protected\n\t * @param {Function} PluginConstructor The plugin constructor.\n\t * @param {module:core/plugin~PluginInterface} plugin The instance of the plugin.\n\t */\n\t_add( PluginConstructor, plugin ) {\n\t\tthis._plugins.set( PluginConstructor, plugin );\n\n\t\tconst pluginName = PluginConstructor.pluginName;\n\n\t\tif ( !pluginName ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( this._plugins.has( pluginName ) ) {\n\t\t\t/**\n\t\t\t * Two plugins with the same {@link module:core/plugin~PluginInterface.pluginName} were loaded.\n\t\t\t * This will lead to runtime conflicts between these plugins.\n\t\t\t *\n\t\t\t * In practice, this warning usually means that new plugins were added to an existing CKEditor 5 build.\n\t\t\t * Plugins should always be added to a source version of the editor (`@ckeditor/ckeditor5-editor-*`),\n\t\t\t * not to an editor imported from one of the `@ckeditor/ckeditor5-build-*` packages.\n\t\t\t *\n\t\t\t * Check your import paths and the list of plugins passed to\n\t\t\t * {@link module:core/editor/editor~Editor.create `Editor.create()`}\n\t\t\t * or specified in {@link module:core/editor/editor~Editor.builtinPlugins `Editor.builtinPlugins`}.\n\t\t\t *\n\t\t\t * The second option is that your `node_modules/` directory contains duplicated versions of the same\n\t\t\t * CKEditor 5 packages. Normally, on clean installations, npm deduplicates packages in `node_modules/`, so\n\t\t\t * it may be enough to call `rm -rf node_modules && npm i`. However, if you installed conflicting versions\n\t\t\t * of packages, their dependencies may need to be installed in more than one version which may lead to this\n\t\t\t * warning.\n\t\t\t *\n\t\t\t * Technically speaking, this error occurs because after adding a plugin to an existing editor build\n\t\t\t * dependencies of this plugin are being duplicated.\n\t\t\t * They are already built into that editor build and now get added for the second time as dependencies\n\t\t\t * of the plugin you are installing.\n\t\t\t *\n\t\t\t * Read more about {@glink builds/guides/integration/installing-plugins installing plugins}.\n\t\t\t *\n\t\t\t * @error plugincollection-plugin-name-conflict\n\t\t\t * @param {String} pluginName The duplicated plugin name.\n\t\t\t * @param {Function} plugin1 The first plugin constructor.\n\t\t\t * @param {Function} plugin2 The second plugin constructor.\n\t\t\t */\n\t\t\tlog.warn(\n\t\t\t\t'plugincollection-plugin-name-conflict: Two plugins with the same name were loaded.',\n\t\t\t\t{ pluginName, plugin1: this._plugins.get( pluginName ).constructor, plugin2: PluginConstructor }\n\t\t\t);\n\t\t} else {\n\t\t\tthis._plugins.set( pluginName, plugin );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/commandcollection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Collection of commands. Its instance is available in {@link module:core/editor/editor~Editor#commands `editor.commands`}.\n */\nexport default class CommandCollection {\n\t/**\n\t * Creates collection instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Command map.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._commands = new Map();\n\t}\n\n\t/**\n\t * Registers a new command.\n\t *\n\t * @param {String} commandName The name of the command.\n\t * @param {module:core/command~Command} command\n\t */\n\tadd( commandName, command ) {\n\t\tthis._commands.set( commandName, command );\n\t}\n\n\t/**\n\t * Retrieves a command from the collection.\n\t *\n\t * @param {String} commandName The name of the command.\n\t * @returns {module:core/command~Command}\n\t */\n\tget( commandName ) {\n\t\treturn this._commands.get( commandName );\n\t}\n\n\t/**\n\t * Executes a command.\n\t *\n\t * @param {String} commandName The name of the command.\n\t */\n\texecute( commandName, ...args ) {\n\t\tconst command = this.get( commandName );\n\n\t\tif ( !command ) {\n\t\t\t/**\n\t\t\t * Command does not exist.\n\t\t\t *\n\t\t\t * @error commandcollection-command-not-found\n\t\t\t * @param {String} commandName Name of the command.\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'commandcollection-command-not-found: Command does not exist.', { commandName } );\n\t\t}\n\n\t\tcommand.execute( ...args );\n\t}\n\n\t/**\n\t * Returns iterator of command names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* names() {\n\t\tyield* this._commands.keys();\n\t}\n\n\t/**\n\t * Returns iterator of command instances.\n\t *\n\t * @returns {Iterable.<module:core/command~Command>}\n\t */\n\t* commands() {\n\t\tyield* this._commands.values();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Returns `[ commandName, commandInstance ]` pairs.\n\t *\n\t * @returns {Iterable.<Array>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._commands[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Destroys all collection commands.\n\t */\n\tdestroy() {\n\t\tfor ( const command of this.commands() ) {\n\t\t\tcommand.destroy();\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window */\n\n/**\n * @module utils/translation-service\n */\n\n/* istanbul ignore else */\nif ( !window.CKEDITOR_TRANSLATIONS ) {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n/**\n * Adds translations to existing ones.\n * These translations will later be available for the {@link module:utils/translation-service~translate `translate()`} function.\n *\n *\t\tadd( 'pl', {\n *\t\t\t'OK': 'OK',\n *\t\t\t'Cancel [context: reject]': 'Anuluj'\n *\t\t} );\n *\n * If you cannot import this function from this module (e.g. because you use a CKEditor 5 build), then you can\n * still add translations by extending the global `window.CKEDITOR_TRANSLATIONS` object by using a function like\n * the one below:\n *\n *\t\tfunction addTranslations( language, translations ) {\n *\t\t\tif ( !window.CKEDITOR_TRANSLATIONS ) {\n *\t\t\t\twindow.CKEDITOR_TRANSLATIONS = {};\n *\t\t\t}\n *\n *\t\t\tconst dictionary = window.CKEDITOR_TRANSLATIONS[ language ] || ( window.CKEDITOR_TRANSLATIONS[ language ] = {} );\n *\n *\t\t\t// Extend the dictionary for the given language.\n *\t\t\tObject.assign( dictionary, translations );\n *\t\t}\n *\n * @param {String} language Target language.\n * @param {Object.<String, String>} translations Translations which will be added to the dictionary.\n */\nexport function add( language, translations ) {\n\tconst dictionary = window.CKEDITOR_TRANSLATIONS[ language ] || ( window.CKEDITOR_TRANSLATIONS[ language ] = {} );\n\n\tObject.assign( dictionary, translations );\n}\n\n/**\n * Translates string if the translation of the string was previously added to the dictionary.\n * See {@link module:utils/translation-service Translation Service}.\n * This happens in a multi-language mode were translation modules are created by the bundler.\n *\n * When no translation is defined in the dictionary or the dictionary doesn't exist this function returns\n * the original string without the `'[context: ]'` (happens in development and single-language modes).\n *\n * In a single-language mode (when values passed to `t()` were replaced with target language strings) the dictionary\n * is left empty, so this function will return the original strings always.\n *\n *\t\ttranslate( 'pl', 'Cancel [context: reject]' );\n *\n * @param {String} language Target language.\n * @param {String} translationKey String that will be translated.\n * @returns {String} Translated sentence.\n */\nexport function translate( language, translationKey ) {\n\tconst numberOfLanguages = getNumberOfLanguages();\n\n\tif ( numberOfLanguages === 1 ) {\n\t\t// Override the language to the only supported one.\n\t\t// This can't be done in the `Locale` class, because the translations comes after the `Locale` class initialization.\n\t\tlanguage = Object.keys( window.CKEDITOR_TRANSLATIONS )[ 0 ];\n\t}\n\n\tif ( numberOfLanguages === 0 || !hasTranslation( language, translationKey ) ) {\n\t\treturn translationKey.replace( / \\[context: [^\\]]+\\]$/, '' );\n\t}\n\n\tconst dictionary = window.CKEDITOR_TRANSLATIONS[ language ];\n\n\t// In case of missing translations we still need to cut off the `[context: ]` parts.\n\treturn dictionary[ translationKey ].replace( / \\[context: [^\\]]+\\]$/, '' );\n}\n\n/**\n * Clears dictionaries for test purposes.\n *\n * @protected\n */\nexport function _clear() {\n\twindow.CKEDITOR_TRANSLATIONS = {};\n}\n\n// Checks whether the dictionary exists and translation in that dictionary exists.\nfunction hasTranslation( language, translationKey ) {\n\treturn (\n\t\t( language in window.CKEDITOR_TRANSLATIONS ) &&\n\t\t( translationKey in window.CKEDITOR_TRANSLATIONS[ language ] )\n\t);\n}\n\nfunction getNumberOfLanguages() {\n\treturn Object.keys( window.CKEDITOR_TRANSLATIONS ).length;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/locale\n */\n\nimport { translate } from './translation-service';\n\n/**\n * Represents the localization services.\n */\nexport default class Locale {\n\t/**\n\t * Creates a new instance of the Locale class.\n\t *\n\t * @param {String} [language='en'] The language code in [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t */\n\tconstructor( language ) {\n\t\t/**\n\t\t * The language code in [ISO 639-1](https://en.wikipedia.org/wiki/ISO_639-1) format.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.language = language || 'en';\n\n\t\t/**\n\t\t * Translates the given string to the {@link #language}. This method is also available in {@link module:core/editor/editor~Editor#t}\n\t\t * and {@link module:ui/view~View#t}.\n\t\t *\n\t\t * The strings may contain placeholders (`%<index>`) for values which are passed as the second argument.\n\t\t * `<index>` is the index in the `values` array.\n\t\t *\n\t\t *\t\teditor.t( 'Created file \"%0\" in %1ms.', [ fileName, timeTaken ] );\n\t\t *\n\t\t * This method's context is statically bound to Locale instance,\n\t\t * so it can be called as a function:\n\t\t *\n\t\t *\t\tconst t = this.t;\n\t\t *\t\tt( 'Label' );\n\t\t *\n\t\t * @method #t\n\t\t * @param {String} str The string to translate.\n\t\t * @param {String[]} values Values that should be used to interpolate the string.\n\t\t */\n\t\tthis.t = ( ...args ) => this._t( ...args );\n\t}\n\n\t/**\n\t * Base for the {@link #t} method.\n\t *\n\t * @private\n\t */\n\t_t( str, values ) {\n\t\tlet translatedString = translate( this.language, str );\n\n\t\tif ( values ) {\n\t\t\ttranslatedString = translatedString.replace( /%(\\d+)/g, ( match, index ) => {\n\t\t\t\treturn ( index < values.length ) ? values[ index ] : match;\n\t\t\t} );\n\t\t}\n\n\t\treturn translatedString;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/viewconsumable\n */\n\nimport isArray from '@ckeditor/ckeditor5-utils/src/lib/lodash/isArray';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Class used for handling consumption of view {@link module:engine/view/element~Element elements},\n * {@link module:engine/view/text~Text text nodes} and {@link module:engine/view/documentfragment~DocumentFragment document fragments}.\n * Element's name and its parts (attributes, classes and styles) can be consumed separately. Consuming an element's name\n * does not consume its attributes, classes and styles.\n * To add items for consumption use {@link module:engine/conversion/viewconsumable~ViewConsumable#add add method}.\n * To test items use {@link module:engine/conversion/viewconsumable~ViewConsumable#test test method}.\n * To consume items use {@link module:engine/conversion/viewconsumable~ViewConsumable#consume consume method}.\n * To revert already consumed items use {@link module:engine/conversion/viewconsumable~ViewConsumable#revert revert method}.\n *\n *\t\tviewConsumable.add( element, { name: true } ); // Adds element's name as ready to be consumed.\n *\t\tviewConsumable.add( textNode ); // Adds text node for consumption.\n *\t\tviewConsumable.add( docFragment ); // Adds document fragment for consumption.\n *\t\tviewConsumable.test( element, { name: true }  ); // Tests if element's name can be consumed.\n *\t\tviewConsumable.test( textNode ); // Tests if text node can be consumed.\n *\t\tviewConsumable.test( docFragment ); // Tests if document fragment can be consumed.\n *\t\tviewConsumable.consume( element, { name: true }  ); // Consume element's name.\n *\t\tviewConsumable.consume( textNode ); // Consume text node.\n *\t\tviewConsumable.consume( docFragment ); // Consume document fragment.\n *\t\tviewConsumable.revert( element, { name: true }  ); // Revert already consumed element's name.\n *\t\tviewConsumable.revert( textNode ); // Revert already consumed text node.\n *\t\tviewConsumable.revert( docFragment ); // Revert already consumed document fragment.\n */\nexport default class ViewConsumable {\n\t/**\n\t * Creates new ViewConsumable.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Map of consumable elements. If {@link module:engine/view/element~Element element} is used as a key,\n\t\t * {@link module:engine/conversion/viewconsumable~ViewElementConsumables ViewElementConsumables} instance is stored as value.\n\t\t * For {@link module:engine/view/text~Text text nodes} and\n\t\t * {@link module:engine/view/documentfragment~DocumentFragment document fragments} boolean value is stored as value.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map.<module:engine/conversion/viewconsumable~ViewElementConsumables|Boolean>}\n\t\t*/\n\t\tthis._consumables = new Map();\n\t}\n\n\t/**\n\t * Adds {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} as ready to be consumed.\n\t *\n\t *\t\tviewConsumable.add( p, { name: true } ); // Adds element's name to consume.\n\t *\t\tviewConsumable.add( p, { attributes: 'name' } ); // Adds element's attribute.\n\t *\t\tviewConsumable.add( p, { classes: 'foobar' } ); // Adds element's class.\n\t *\t\tviewConsumable.add( p, { styles: 'color' } ); // Adds element's style\n\t *\t\tviewConsumable.add( p, { attributes: 'name', styles: 'color' } ); // Adds attribute and style.\n\t *\t\tviewConsumable.add( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be provided.\n\t *\t\tviewConsumable.add( textNode ); // Adds text node to consume.\n\t *\t\tviewConsumable.add( docFragment ); // Adds document fragment to consume.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * attribute is provided - it should be handled separately by providing actual style/class.\n\t *\n\t *\t\tviewConsumable.add( p, { attributes: 'style' } ); // This call will throw an exception.\n\t *\t\tviewConsumable.add( p, { styles: 'color' } ); // This is properly handled style.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t */\n\tadd( element, consumables ) {\n\t\tlet elementConsumables;\n\n\t\t// For text nodes and document fragments just mark them as consumable.\n\t\tif ( element.is( 'text' ) || element.is( 'documentFragment' ) ) {\n\t\t\tthis._consumables.set( element, true );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// For elements create new ViewElementConsumables or update already existing one.\n\t\tif ( !this._consumables.has( element ) ) {\n\t\t\telementConsumables = new ViewElementConsumables();\n\t\t\tthis._consumables.set( element, elementConsumables );\n\t\t} else {\n\t\t\telementConsumables = this._consumables.get( element );\n\t\t}\n\n\t\telementConsumables.add( consumables );\n\t}\n\n\t/**\n\t * Tests if {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} can be consumed.\n\t * It returns `true` when all items included in method's call can be consumed. Returns `false` when\n\t * first already consumed item is found and `null` when first non-consumable item is found.\n\t *\n\t *\t\tviewConsumable.test( p, { name: true } ); // Tests element's name.\n\t *\t\tviewConsumable.test( p, { attributes: 'name' } ); // Tests attribute.\n\t *\t\tviewConsumable.test( p, { classes: 'foobar' } ); // Tests class.\n\t *\t\tviewConsumable.test( p, { styles: 'color' } ); // Tests style.\n\t *\t\tviewConsumable.test( p, { attributes: 'name', styles: 'color' } ); // Tests attribute and style.\n\t *\t\tviewConsumable.test( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be tested.\n\t *\t\tviewConsumable.test( textNode ); // Tests text node.\n\t *\t\tviewConsumable.test( docFragment ); // Tests document fragment.\n\t *\n\t * Testing classes and styles as attribute will test if all added classes/styles can be consumed.\n\t *\n\t *\t\tviewConsumable.test( p, { attributes: 'class' } ); // Tests if all added classes can be consumed.\n\t *\t\tviewConsumable.test( p, { attributes: 'style' } ); // Tests if all added styles can be consumed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t * @returns {Boolean|null} Returns `true` when all items included in method's call can be consumed. Returns `false`\n\t * when first already consumed item is found and `null` when first non-consumable item is found.\n\t */\n\ttest( element, consumables ) {\n\t\tconst elementConsumables = this._consumables.get( element );\n\n\t\tif ( elementConsumables === undefined ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// For text nodes and document fragments return stored boolean value.\n\t\tif ( element.is( 'text' ) || element.is( 'documentFragment' ) ) {\n\t\t\treturn elementConsumables;\n\t\t}\n\n\t\t// For elements test consumables object.\n\t\treturn elementConsumables.test( consumables );\n\t}\n\n\t/**\n\t * Consumes {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t * It returns `true` when all items included in method's call can be consumed, otherwise returns `false`.\n\t *\n\t *\t\tviewConsumable.consume( p, { name: true } ); // Consumes element's name.\n\t *\t\tviewConsumable.consume( p, { attributes: 'name' } ); // Consumes element's attribute.\n\t *\t\tviewConsumable.consume( p, { classes: 'foobar' } ); // Consumes element's class.\n\t *\t\tviewConsumable.consume( p, { styles: 'color' } ); // Consumes element's style.\n\t *\t\tviewConsumable.consume( p, { attributes: 'name', styles: 'color' } ); // Consumes attribute and style.\n\t *\t\tviewConsumable.consume( p, { classes: [ 'baz', 'bar' ] } ); // Multiple consumables can be consumed.\n\t *\t\tviewConsumable.consume( textNode ); // Consumes text node.\n\t *\t\tviewConsumable.consume( docFragment ); // Consumes document fragment.\n\t *\n\t * Consuming classes and styles as attribute will test if all added classes/styles can be consumed.\n\t *\n\t *\t\tviewConsumable.consume( p, { attributes: 'class' } ); // Consume only if all added classes can be consumed.\n\t *\t\tviewConsumable.consume( p, { attributes: 'style' } ); // Consume only if all added styles can be consumed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t * @returns {Boolean} Returns `true` when all items included in method's call can be consumed,\n\t * otherwise returns `false`.\n\t */\n\tconsume( element, consumables ) {\n\t\tif ( this.test( element, consumables ) ) {\n\t\t\tif ( element.is( 'text' ) || element.is( 'documentFragment' ) ) {\n\t\t\t\t// For text nodes and document fragments set value to false.\n\t\t\t\tthis._consumables.set( element, false );\n\t\t\t} else {\n\t\t\t\t// For elements - consume consumables object.\n\t\t\t\tthis._consumables.get( element ).consume( consumables );\n\t\t\t}\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Reverts {@link module:engine/view/element~Element view element}, {@link module:engine/view/text~Text text node} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment} so they can be consumed once again.\n\t * Method does not revert items that were never previously added for consumption, even if they are included in\n\t * method's call.\n\t *\n\t *\t\tviewConsumable.revert( p, { name: true } ); // Reverts element's name.\n\t *\t\tviewConsumable.revert( p, { attributes: 'name' } ); // Reverts element's attribute.\n\t *\t\tviewConsumable.revert( p, { classes: 'foobar' } ); // Reverts element's class.\n\t *\t\tviewConsumable.revert( p, { styles: 'color' } ); // Reverts element's style.\n\t *\t\tviewConsumable.revert( p, { attributes: 'name', styles: 'color' } ); // Reverts attribute and style.\n\t *\t\tviewConsumable.revert( p, { classes: [ 'baz', 'bar' ] } ); // Multiple names can be reverted.\n\t *\t\tviewConsumable.revert( textNode ); // Reverts text node.\n\t *\t\tviewConsumable.revert( docFragment ); // Reverts document fragment.\n\t *\n\t * Reverting classes and styles as attribute will revert all classes/styles that were previously added for\n\t * consumption.\n\t *\n\t *\t\tviewConsumable.revert( p, { attributes: 'class' } ); // Reverts all classes added for consumption.\n\t *\t\tviewConsumable.revert( p, { attributes: 'style' } ); // Reverts all styles added for consumption.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/text~Text|module:engine/view/documentfragment~DocumentFragment} element\n\t * @param {Object} [consumables] Used only if first parameter is {@link module:engine/view/element~Element view element} instance.\n\t * @param {Boolean} consumables.name If set to true element's name will be included.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names.\n\t */\n\trevert( element, consumables ) {\n\t\tconst elementConsumables = this._consumables.get( element );\n\n\t\tif ( elementConsumables !== undefined ) {\n\t\t\tif ( element.is( 'text' ) || element.is( 'documentFragment' ) ) {\n\t\t\t\t// For text nodes and document fragments - set consumable to true.\n\t\t\t\tthis._consumables.set( element, true );\n\t\t\t} else {\n\t\t\t\t// For elements - revert items from consumables object.\n\t\t\t\telementConsumables.revert( consumables );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates consumable object from {@link module:engine/view/element~Element view element}. Consumable object will include\n\t * element's name and all its attributes, classes and styles.\n\t *\n\t * @static\n\t * @param {module:engine/view/element~Element} element\n\t * @returns {Object} consumables\n\t */\n\tstatic consumablesFromElement( element ) {\n\t\tconst consumables = {\n\t\t\tname: true,\n\t\t\tattributes: [],\n\t\t\tclasses: [],\n\t\t\tstyles: []\n\t\t};\n\n\t\tconst attributes = element.getAttributeKeys();\n\n\t\tfor ( const attribute of attributes ) {\n\t\t\t// Skip classes and styles - will be added separately.\n\t\t\tif ( attribute == 'style' || attribute == 'class' ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tconsumables.attributes.push( attribute );\n\t\t}\n\n\t\tconst classes = element.getClassNames();\n\n\t\tfor ( const className of classes ) {\n\t\t\tconsumables.classes.push( className );\n\t\t}\n\n\t\tconst styles = element.getStyleNames();\n\n\t\tfor ( const style of styles ) {\n\t\t\tconsumables.styles.push( style );\n\t\t}\n\n\t\treturn consumables;\n\t}\n\n\t/**\n\t * Creates {@link module:engine/conversion/viewconsumable~ViewConsumable ViewConsumable} instance from\n\t * {@link module:engine/view/node~Node node} or {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t * Instance will contain all elements, child nodes, attributes, styles and classes added for consumption.\n\t *\n\t * @static\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} from View node or document fragment\n\t * from which `ViewConsumable` will be created.\n\t * @param {module:engine/conversion/viewconsumable~ViewConsumable} [instance] If provided, given `ViewConsumable` instance will be used\n\t * to add all consumables. It will be returned instead of a new instance.\n\t */\n\tstatic createFrom( from, instance ) {\n\t\tif ( !instance ) {\n\t\t\tinstance = new ViewConsumable();\n\t\t}\n\n\t\tif ( from.is( 'text' ) ) {\n\t\t\tinstance.add( from );\n\n\t\t\treturn instance;\n\t\t}\n\n\t\t// Add `from` itself, if it is an element.\n\t\tif ( from.is( 'element' ) ) {\n\t\t\tinstance.add( from, ViewConsumable.consumablesFromElement( from ) );\n\t\t}\n\n\t\tif ( from.is( 'documentFragment' ) ) {\n\t\t\tinstance.add( from );\n\t\t}\n\n\t\tfor ( const child of from.getChildren() ) {\n\t\t\tinstance = ViewConsumable.createFrom( child, instance );\n\t\t}\n\n\t\treturn instance;\n\t}\n}\n\n/**\n * This is a private helper-class for {@link module:engine/conversion/viewconsumable~ViewConsumable}.\n * It represents and manipulates consumable parts of a single {@link module:engine/view/element~Element}.\n *\n * @private\n */\nclass ViewElementConsumables {\n\t/**\n\t * Creates ViewElementConsumables instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Flag indicating if name of the element can be consumed.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._canConsumeName = null;\n\n\t\t/**\n\t\t * Contains maps of element's consumables: attributes, classes and styles.\n\t\t *\n\t\t * @private\n\t\t * @member {Object}\n\t\t */\n\t\tthis._consumables = {\n\t\t\tattributes: new Map(),\n\t\t\tstyles: new Map(),\n\t\t\tclasses: new Map()\n\t\t};\n\t}\n\n\t/**\n\t * Adds consumable parts of the {@link module:engine/view/element~Element view element}.\n\t * Element's name itself can be marked to be consumed (when element's name is consumed its attributes, classes and\n\t * styles still could be consumed):\n\t *\n\t *\t\tconsumables.add( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.add( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.add( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * attribute is provided - it should be handled separately by providing `style` and `class` in consumables object.\n\t *\n\t * @param {Object} consumables Object describing which parts of the element can be consumed.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be added as consumable.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to add as consumable.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to add as consumable.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to add as consumable.\n\t */\n\tadd( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = true;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._add( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Tests if parts of the {@link module:engine/view/node~Node view node} can be consumed.\n\t *\n\t * Element's name can be tested:\n\t *\n\t *\t\tconsumables.test( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.test( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.test( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be tested.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be tested.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to test.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to test.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to test.\n\t * @returns {Boolean|null} `true` when all tested items can be consumed, `null` when even one of the items\n\t * was never marked for consumption and `false` when even one of the items was already consumed.\n\t */\n\ttest( consumables ) {\n\t\t// Check if name can be consumed.\n\t\tif ( consumables.name && !this._canConsumeName ) {\n\t\t\treturn this._canConsumeName;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tconst value = this._test( type, consumables[ type ] );\n\n\t\t\t\tif ( value !== true ) {\n\t\t\t\t\treturn value;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Return true only if all can be consumed.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Consumes parts of {@link module:engine/view/element~Element view element}. This function does not check if consumable item\n\t * is already consumed - it consumes all consumable items provided.\n\t * Element's name can be consumed:\n\t *\n\t *\t\tconsumables.consume( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.consume( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.consume( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be consumed.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be consumed.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to consume.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to consume.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to consume.\n\t */\n\tconsume( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = false;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._consume( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Revert already consumed parts of {@link module:engine/view/element~Element view Element}, so they can be consumed once again.\n\t * Element's name can be reverted:\n\t *\n\t *\t\tconsumables.revert( { name: true } );\n\t *\n\t * Attributes classes and styles:\n\t *\n\t *\t\tconsumables.revert( { attributes: 'title', classes: 'foo', styles: 'color' } );\n\t *\t\tconsumables.revert( { attributes: [ 'title', 'name' ], classes: [ 'foo', 'bar' ] );\n\t *\n\t * @param {Object} consumables Object describing which parts of the element should be reverted.\n\t * @param {Boolean} consumables.name If set to `true` element's name will be reverted.\n\t * @param {String|Array.<String>} consumables.attributes Attribute name or array of attribute names to revert.\n\t * @param {String|Array.<String>} consumables.classes Class name or array of class names to revert.\n\t * @param {String|Array.<String>} consumables.styles Style name or array of style names to revert.\n\t */\n\trevert( consumables ) {\n\t\tif ( consumables.name ) {\n\t\t\tthis._canConsumeName = true;\n\t\t}\n\n\t\tfor ( const type in this._consumables ) {\n\t\t\tif ( type in consumables ) {\n\t\t\t\tthis._revert( type, consumables[ type ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that adds consumables of a given type: attribute, class or style.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `viewconsumable-invalid-attribute` when `class` or `style`\n\t * type is provided - it should be handled separately by providing actual style/class type.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_add( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\t/**\n\t\t\t\t * Class and style attributes should be handled separately in\n\t\t\t\t * {@link module:engine/conversion/viewconsumable~ViewConsumable#add `ViewConsumable#add()`}.\n\t\t\t\t *\n\t\t\t\t * What you have done is trying to use:\n\t\t\t\t *\n\t\t\t\t *\t\tconsumables.add( { attributes: [ 'class', 'style' ] } );\n\t\t\t\t *\n\t\t\t\t * While each class and style should be registered separately:\n\t\t\t\t *\n\t\t\t\t *\t\tconsumables.add( { classes: 'some-class', styles: 'font-weight' } );\n\t\t\t\t *\n\t\t\t\t * @error viewconsumable-invalid-attribute\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'viewconsumable-invalid-attribute: Classes and styles should be handled separately.' );\n\t\t\t}\n\n\t\t\tconsumables.set( name, true );\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that tests consumables of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t * @returns {Boolean|null} Returns `true` if all items can be consumed, `null` when one of the items cannot be\n\t * consumed and `false` when one of the items is already consumed.\n\t */\n\t_test( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// Check all classes/styles if class/style attribute is tested.\n\t\t\t\tconst value = this._test( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\n\t\t\t\tif ( value !== true ) {\n\t\t\t\t\treturn value;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst value = consumables.get( name );\n\t\t\t\t// Return null if attribute is not found.\n\t\t\t\tif ( value === undefined ) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tif ( !value ) {\n\t\t\t\t\treturn false;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Helper method that consumes items of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_consume( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// If class or style is provided for consumption - consume them all.\n\t\t\t\tthis._consume( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\t\t\t} else {\n\t\t\t\tconsumables.set( name, false );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Helper method that reverts items of a given type: attribute, class or style.\n\t *\n\t * @private\n\t * @param {String} type Type of the consumable item: `attributes`, `classes` or , `styles`.\n\t * @param {String|Array.<String>} item Consumable item or array of items.\n\t */\n\t_revert( type, item ) {\n\t\tconst items = isArray( item ) ? item : [ item ];\n\t\tconst consumables = this._consumables[ type ];\n\n\t\tfor ( const name of items ) {\n\t\t\tif ( type === 'attributes' && ( name === 'class' || name === 'style' ) ) {\n\t\t\t\tconst consumableName = name == 'class' ? 'classes' : 'styles';\n\n\t\t\t\t// If class or style is provided for reverting - revert them all.\n\t\t\t\tthis._revert( consumableName, [ ...this._consumables[ consumableName ].keys() ] );\n\t\t\t} else {\n\t\t\t\tconst value = consumables.get( name );\n\n\t\t\t\tif ( value === false ) {\n\t\t\t\t\tconsumables.set( name, true );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/schema\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\nimport Range from './range';\nimport Position from './position';\nimport Element from './element';\nimport TreeWalker from './treewalker';\n\n/**\n * The model's schema. It defines allowed and disallowed structures of nodes as well as nodes' attributes.\n * The schema is usually defined by features and based on them the editing framework and features\n * make decisions how to change and process the model.\n *\n * The instance of schema is available in {@link module:engine/model/model~Model#schema `editor.model.schema`}.\n *\n * # Schema definitions\n *\n * Schema defines allowed model structures and allowed attributes separately. They are also checked separately\n * by using the {@link ~Schema#checkChild} and {@link ~Schema#checkAttribute} methods.\n *\n * ## Defining allowed structures\n *\n * When a feature introduces a model element it should register it in the schema. Besides\n * defining that such an element may exist in the model, the feature also needs to define where\n * this element may be placed:\n *\n *\t\tschema.register( 'myElement', {\n *\t\t\tallowIn: '$root'\n *\t\t} );\n *\n * This lets the schema know that `<myElement>` may be a child of the `<$root>` element. `$root` is one of generic\n * nodes defined by the editing framework. By default, the editor names the main root element a `<$root>`,\n * so the above definition allows `<myElement>` in the main editor element.\n *\n * In other words, this would be correct:\n *\n *\t\t<$root><myElement></myElement></$root>\n *\n * While this would not be correct:\n *\n *\t\t<$root><foo><myElement></myElement></foo></$root>\n *\n * ## Generic items\n *\n * There are three basic generic items: `$root`, `$block` and `$text`.\n * They are defined as follows:\n *\n *\t\tthis.schema.register( '$root', {\n *\t\t\tisLimit: true\n *\t\t} );\n *\t\tthis.schema.register( '$block', {\n *\t\t\tallowIn: '$root',\n *\t\t\tisBlock: true\n *\t\t} );\n *\t\tthis.schema.register( '$text', {\n *\t\t\tallowIn: '$block'\n *\t\t} );\n *\n * These definitions can then be reused by features to create their own definitions in a more extensible way.\n * For example, the {@link module:paragraph/paragraph~Paragraph} feature will define its item as:\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tinheritAllFrom: '$block'\n *\t\t} );\n *\n * Which translates to:\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowContentOf: '$block',\n *\t\t\tallowAttributesOf: '$block',\n *\t\t\tinheritTypesFrom: '$block'\n *\t\t} );\n *\n * Which can be read as:\n *\n * * The `<paragraph>` element will be allowed in elements in which `<$block>` is allowed (e.g. in `<$root>`).\n * * The `<paragraph>` element will allow all nodes which are allowed in `<$block>` (e.g. `$text`).\n * * The `<paragraph>` element will allow all attributes allowed on `<$block>`.\n * * The `<paragraph>` element will inherit all `is*` properties of `<$block>` (e.g. `isBlock`).\n *\n * Thanks to the fact that `<paragraph>`'s definition is inherited from `<$block>` other features can use the `<$block>`\n * type to indirectly extend `<paragraph>`'s definition. For example, the {@link module:block-quote/blockquote~BlockQuote}\n * feature does this:\n *\n *\t\tschema.register( 'blockQuote', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowContentOf: '$root'\n *\t\t} );\n *\n * Thanks to that, despite the fact that block quote and paragraph features know nothing about themselves, paragraphs\n * will be allowed in block quotes and block quotes will be allowed in all places where blocks are. So if anyone will\n * register a `<section>` element (with `allowContentOf: '$root'` rule), that `<section>` elements will allow\n * block quotes too.\n *\n * The side effect of such a definition inheritance is that now `<blockQuote>` is allowed in `<blockQuote>` which needs to be\n * resolved by a callback which will disallow this specific structure.\n *\n * You can read more about the format of an item definition in {@link module:engine/model/schema~SchemaItemDefinition}.\n *\n * ## Defining advanced rules in `checkChild()`'s callbacks\n *\n * The {@link ~Schema#checkChild} method which is the base method used to check whether some element is allowed in a given structure\n * is {@link module:utils/observablemixin~ObservableMixin#decorate a decorated method}.\n * It means that you can add listeners to implement your specific rules which are not limited by the declarative\n * {@link module:engine/model/schema~SchemaItemDefinition API}.\n *\n * Those listeners can be added either by listening directly to the {@link ~Schema#event:checkChild} event or\n * by using the handy {@link ~Schema#addChildCheck} method.\n *\n * For instance, the block quote feature defines such a listener to disallow nested `<blockQuote>` structures:\n *\n *\t\tschema.addChildCheck( context, childDefinition ) => {\n *\t\t\t// Note that context is automatically normalized to SchemaContext instance and\n *\t\t\t// child to its definition (SchemaCompiledItemDefinition).\n *\n *\t\t\t// If checkChild() is called with a context that ends with blockQuote and blockQuote as a child\n *\t\t\t// to check, make the checkChild() method return false.\n *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition.name == 'blockQuote' ) {\n *\t\t\t\treturn false;\n *\t\t\t}\n *\t\t} );\n *\n * ## Defining attributes\n *\n * TODO\n *\n * ## Implementing additional constraints\n *\n * Schema's capabilities were limited to simple (and atomic) {@link ~Schema#checkChild} and\n * {@link ~Schema#checkAttribute} checks on purpose.\n * One may imagine that schema should support defining more complex rules such as\n * \"element `<x>` must be always followed by `<y>`\".\n * While it is feasible to create an API which would enable feeding the schema with such definitions,\n * it is unfortunately unrealistic to then expect that every editing feature will consider those rules when processing the model.\n * It is also unrealistic to expect that it will be done automatically by the schema and the editing engine themselves.\n *\n * For instance, let's get back to the \"element `<x>` must be always followed by `<y>`\" rule and this initial content:\n *\n *\t\t<$root>\n *\t\t\t<x>foo</x>\n *\t\t\t<y>bar[bom</y>\n *\t\t\t<z>bom]bar</z>\n *\t\t</$root>\n *\n * Now, imagine that the user presses the \"block quote\" button. Usually it would wrap the two selected blocks\n * (`<y>` and `<z>`) with a `<blockQuote>` element:\n *\n *\t\t<$root>\n *\t\t\t<x>foo</x>\n *\t\t\t<blockQuote>\n *\t\t\t\t<y>bar[bom</y>\n *\t\t\t\t<z>bom]bar</z>\n *\t\t\t</blockQuote>\n *\t\t</$root>\n *\n * But it turns out that this creates an incorrect structure – `<x>` is not followed by `<y>` anymore.\n *\n * What should happen instead? There are at least 4 possible solutions: the block quote feature should not be\n * applicable in such a context, someone should create a new `<y>` right after `<x>`, `<x>` should be moved\n * inside `<blockQuote>` together with `<y>` or vice versa.\n *\n * While this is a relatively simple scenario (unlike most real-time collaboration scenarios),\n * it turns out that it's already hard to say what should happen and who should react to fix this content.\n *\n * Therefore, if your editor needs to implement such rules, you should do that through model's post-fixers\n * fixing incorrect content or actively prevent such situations (e.g. by disabling certain features).\n * It means that those constraints will be defined specifically for your scenario by your code which\n * makes their implementation much easier.\n *\n * So the answer for who and how should implement additional constraints is your features or your editor\n * through CKEditor 5's rich and open API.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Schema {\n\t/**\n\t * Creates schema instance.\n\t */\n\tconstructor() {\n\t\tthis._sourceDefinitions = {};\n\n\t\tthis.decorate( 'checkChild' );\n\t\tthis.decorate( 'checkAttribute' );\n\n\t\tthis.on( 'checkAttribute', ( evt, args ) => {\n\t\t\targs[ 0 ] = new SchemaContext( args[ 0 ] );\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.on( 'checkChild', ( evt, args ) => {\n\t\t\targs[ 0 ] = new SchemaContext( args[ 0 ] );\n\t\t\targs[ 1 ] = this.getDefinition( args[ 1 ] );\n\t\t}, { priority: 'highest' } );\n\t}\n\n\t/**\n\t * Registers schema item. Can only be called once for every item name.\n\t *\n\t *\t\tschema.register( 'paragraph', {\n\t *\t\t\tinheritAllFrom: '$block'\n\t *\t\t} );\n\t *\n\t * @param {String} itemName\n\t * @param {module:engine/model/schema~SchemaItemDefinition} definition\n\t */\n\tregister( itemName, definition ) {\n\t\tif ( this._sourceDefinitions[ itemName ] ) {\n\t\t\t// TODO docs\n\t\t\tthrow new CKEditorError( 'schema-cannot-register-item-twice: A single item cannot be registered twice in the schema.', {\n\t\t\t\titemName\n\t\t\t} );\n\t\t}\n\n\t\tthis._sourceDefinitions[ itemName ] = [\n\t\t\tObject.assign( {}, definition )\n\t\t];\n\n\t\tthis._clearCache();\n\t}\n\n\t/**\n\t * Extends a {@link #register registered} item's definition.\n\t *\n\t * Extending properties such as `allowIn` will add more items to the existing properties,\n\t * while redefining properties such as `isBlock` will override the previously defined ones.\n\t *\n\t *\t\tschema.register( 'foo', {\n\t *\t\t\tallowIn: '$root',\n\t *\t\t\tisBlock: true;\n\t *\t\t} );\n\t *\t\tschema.extend( 'foo', {\n\t *\t\t\tallowIn: 'blockQuote',\n\t *\t\t\tisBlock: false\n\t *\t\t} );\n\t *\n\t *\t\tschema.getDefinition( 'foo' );\n\t *\t\t//\t{\n\t *\t\t//\t\tallowIn: [ '$root', 'blockQuote' ],\n\t *\t\t// \t\tisBlock: false\n\t *\t\t//\t}\n\t *\n\t * @param {String} itemName\n\t * @param {module:engine/model/schema~SchemaItemDefinition} definition\n\t */\n\textend( itemName, definition ) {\n\t\tif ( !this._sourceDefinitions[ itemName ] ) {\n\t\t\t// TODO docs\n\t\t\tthrow new CKEditorError( 'schema-cannot-extend-missing-item: Cannot extend an item which was not registered yet.', {\n\t\t\t\titemName\n\t\t\t} );\n\t\t}\n\n\t\tthis._sourceDefinitions[ itemName ].push( Object.assign( {}, definition ) );\n\n\t\tthis._clearCache();\n\t}\n\n\t/**\n\t * Returns all registered items.\n\t *\n\t * @returns {Object.<String,module:engine/model/schema~SchemaCompiledItemDefinition>}\n\t */\n\tgetDefinitions() {\n\t\tif ( !this._compiledDefinitions ) {\n\t\t\tthis._compile();\n\t\t}\n\n\t\treturn this._compiledDefinitions;\n\t}\n\n\t/**\n\t * Returns a definition of the given item or `undefined` if item is not registered.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t * @returns {module:engine/model/schema~SchemaCompiledItemDefinition}\n\t */\n\tgetDefinition( item ) {\n\t\tlet itemName;\n\n\t\tif ( typeof item == 'string' ) {\n\t\t\titemName = item;\n\t\t} else if ( item.is && ( item.is( 'text' ) || item.is( 'textProxy' ) ) ) {\n\t\t\titemName = '$text';\n\t\t}\n\t\t// Element or module:engine/model/schema~SchemaContextItem.\n\t\telse {\n\t\t\titemName = item.name;\n\t\t}\n\n\t\treturn this.getDefinitions()[ itemName ];\n\t}\n\n\t/**\n\t * Returns `true` if the given item is registered in the schema.\n\t *\n\t *\t\tschema.isRegistered( 'paragraph' ); // -> true\n\t *\t\tschema.isRegistered( editor.model.document.getRoot() ); // -> true\n\t *\t\tschema.isRegistered( 'foo' ); // -> false\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisRegistered( item ) {\n\t\treturn !!this.getDefinition( item );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a block by {@link module:engine/model/schema~SchemaItemDefinition}'s `isBlock` property.\n\t *\n\t *\t\tschema.isBlock( 'paragraph' ); // -> true\n\t *\t\tschema.isBlock( '$root' ); // -> false\n\t *\n\t *\t\tconst paragraphElement = writer.createElement( 'paragraph' );\n\t *\t\tschema.isBlock( paragraphElement ); // -> true\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisBlock( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\treturn !!( def && def.isBlock );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a limit element by {@link module:engine/model/schema~SchemaItemDefinition}'s `isLimit` or `isObject` property\n\t * (all objects are also limits).\n\t *\n\t *\t\tschema.isLimit( 'paragraph' ); // -> false\n\t *\t\tschema.isLimit( '$root' ); // -> true\n\t *\t\tschema.isLimit( editor.model.document.getRoot() ); // -> true\n\t *\t\tschema.isLimit( 'image' ); // -> true\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisLimit( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn !!( def.isLimit || def.isObject );\n\t}\n\n\t/**\n\t * Returns `true` if the given item is defined to be\n\t * a object element by {@link module:engine/model/schema~SchemaItemDefinition}'s `isObject` property.\n\t *\n\t *\t\tschema.isObject( 'paragraph' ); // -> false\n\t *\t\tschema.isObject( 'image' ); // -> true\n\t *\n\t *\t\tconst imageElement = writer.createElement( 'image' );\n\t *\t\tschema.isObject( imageElement ); // -> true\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/schema~SchemaContextItem|String} item\n\t */\n\tisObject( item ) {\n\t\tconst def = this.getDefinition( item );\n\n\t\treturn !!( def && def.isObject );\n\t}\n\n\t/**\n\t * Checks whether the given node (`child`) can be a child of the given context.\n\t *\n\t *\t\tschema.checkChild( model.document.getRoot(), paragraph ); // -> false\n\t *\n\t *\t\tschema.register( 'paragraph', {\n\t *\t\t\tallowIn: '$root'\n\t *\t\t} );\n\t *\t\tschema.checkChild( model.document.getRoot(), paragraph ); // -> true\n\t *\n\t * Note: When verifying whether the given node can be a child of the given context, the\n\t * schema also verifies the entire context &mdash; from its root to its last element. Therefore, it is possible\n\t * for `checkChild()` to return `false` even though the context's last element can contain the checked child.\n\t * It happens if one of the context's elements does not allow its child.\n\t *\n\t * @fires checkChild\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context The context in which the child will be checked.\n\t * @param {module:engine/model/node~Node|String} def The child to check.\n\t */\n\tcheckChild( context, def ) {\n\t\t// Note: context and child are already normalized here to a SchemaContext and SchemaCompiledItemDefinition.\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this._checkContextMatch( def, context );\n\t}\n\n\t/**\n\t * Checks whether the given attribute can be applied in the given context (on the last\n\t * item of the context).\n\t *\n\t *\t\tschema.checkAttribute( textNode, 'bold' ); // -> false\n\t *\n\t *\t\tschema.extend( '$text', {\n\t *\t\t\tallowAttributes: 'bold'\n\t *\t\t} );\n\t *\t\tschema.checkAttribute( textNode, 'bold' ); // -> true\n\t *\n\t * @fires checkAttribute\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context The context in which the attribute will be checked.\n\t * @param {String} attributeName\n\t */\n\tcheckAttribute( context, attributeName ) {\n\t\tconst def = this.getDefinition( context.last );\n\n\t\tif ( !def ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn def.allowAttributes.includes( attributeName );\n\t}\n\n\t/**\n\t * Checks whether the given element (`elementToMerge`) can be merged with the specified base element (`positionOrBaseElement`).\n\t *\n\t * In other words &mdash; whether `elementToMerge`'s children {@link #checkChild are allowed} in the `positionOrBaseElement`.\n\t *\n\t * This check ensures that elements merged with {@link module:engine/model/writer~Writer#merge `Writer#merge()`}\n\t * will be valid.\n\t *\n\t * Instead of elements, you can pass the instance of the {@link module:engine/model/position~Position} class as the\n\t * `positionOrBaseElement`. It means that the elements before and after the position will be checked whether they can be merged.\n\t *\n\t * @param {module:engine/model/position~Position|module:engine/model/element~Element} positionOrBaseElement The position or base\n\t * element to which the `elementToMerge` will be merged.\n\t * @param {module:engine/model/element~Element} elementToMerge The element to merge. Required if `positionOrBaseElement` is an element.\n\t * @returns {Boolean}\n\t */\n\tcheckMerge( positionOrBaseElement, elementToMerge = null ) {\n\t\tif ( positionOrBaseElement instanceof Position ) {\n\t\t\tconst nodeBefore = positionOrBaseElement.nodeBefore;\n\t\t\tconst nodeAfter = positionOrBaseElement.nodeAfter;\n\n\t\t\tif ( !( nodeBefore instanceof Element ) ) {\n\t\t\t\t/**\n\t\t\t\t * The node before the merge position must be an element.\n\t\t\t\t *\n\t\t\t\t * @error schema-check-merge-no-element-before\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'schema-check-merge-no-element-before: The node before the merge position must be an element.' );\n\t\t\t}\n\n\t\t\tif ( !( nodeAfter instanceof Element ) ) {\n\t\t\t\t/**\n\t\t\t\t * The node after the merge position must be an element.\n\t\t\t\t *\n\t\t\t\t * @error schema-check-merge-no-element-after\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError( 'schema-check-merge-no-element-after: The node after the merge position must be an element.' );\n\t\t\t}\n\n\t\t\treturn this.checkMerge( nodeBefore, nodeAfter );\n\t\t}\n\n\t\tfor ( const child of elementToMerge.getChildren() ) {\n\t\t\tif ( !this.checkChild( positionOrBaseElement, child ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Allows registering a callback to the {@link #checkChild} method calls.\n\t *\n\t * Callbacks allow you to implement rules which are not otherwise possible to achieve\n\t * by using the declarative API of {@link module:engine/model/schema~SchemaItemDefinition}.\n\t * For example, by using this method you can disallow elements in specific contexts.\n\t *\n\t * This method is a shorthand for using the {@link #event:checkChild} event. For even better control,\n\t * you can use that event instead.\n\t *\n\t * Example:\n\t *\n\t *\t\t// Disallow heading1 directly inside a blockQuote.\n\t *\t\tschema.addChildCheck( ( context, childDefinition ) => {\n\t *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition.name == 'heading1' ) {\n\t *\t\t\t\treturn false;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Which translates to:\n\t *\n\t *\t\tschema.on( 'checkChild', ( evt, args ) => {\n\t *\t\t\tconst context = args[ 0 ];\n\t *\t\t\tconst childDefinition = args[ 1 ];\n\t *\n\t *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition && childDefinition.name == 'heading1' ) {\n\t *\t\t\t\t// Prevent next listeners from being called.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t\t// Set the checkChild()'s return value.\n\t *\t\t\t\tevt.return = false;\n\t *\t\t\t}\n\t *\t\t}, { priority: 'high' } );\n\t *\n\t * @param {Function} callback The callback to be called. It is called with two parameters:\n\t * {@link module:engine/model/schema~SchemaContext} (context) instance and\n\t * {@link module:engine/model/schema~SchemaCompiledItemDefinition} (child-to-check definition).\n\t * The callback may return `true/false` to override `checkChild()`'s return value. If it does not return\n\t * a boolean value, the default algorithm (or other callbacks) will define `checkChild()`'s return value.\n\t */\n\taddChildCheck( callback ) {\n\t\tthis.on( 'checkChild', ( evt, [ ctx, childDef ] ) => {\n\t\t\t// checkChild() was called with a non-registered child.\n\t\t\t// In 99% cases such check should return false, so not to overcomplicate all callbacks\n\t\t\t// don't even execute them.\n\t\t\tif ( !childDef ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst retValue = callback( ctx, childDef );\n\n\t\t\tif ( typeof retValue == 'boolean' ) {\n\t\t\t\tevt.stop();\n\t\t\t\tevt.return = retValue;\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * Allows registering a callback to the {@link #checkAttribute} method calls.\n\t *\n\t * Callbacks allow you to implement rules which are not otherwise possible to achieve\n\t * by using the declarative API of {@link module:engine/model/schema~SchemaItemDefinition}.\n\t * For example, by using this method you can disallow attribute if node to which it is applied\n\t * is contained within some other element (e.g. you want to disallow `bold` on `$text` within `heading1`).\n\t *\n\t * This method is a shorthand for using the {@link #event:checkAttribute} event. For even better control,\n\t * you can use that event instead.\n\t *\n\t * Example:\n\t *\n\t *\t\t// Disallow bold on $text inside heading1.\n\t *\t\tschema.addChildCheck( ( context, attributeName ) => {\n\t *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n\t *\t\t\t\treturn false;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * Which translates to:\n\t *\n\t *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n\t *\t\t\tconst context = args[ 0 ];\n\t *\t\t\tconst attributeName = args[ 1 ];\n\t *\n\t *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n\t *\t\t\t\t// Prevent next listeners from being called.\n\t *\t\t\t\tevt.stop();\n\t *\t\t\t\t// Set the checkAttribute()'s return value.\n\t *\t\t\t\tevt.return = false;\n\t *\t\t\t}\n\t *\t\t}, { priority: 'high' } );\n\t *\n\t * @param {Function} callback The callback to be called. It is called with two parameters:\n\t * {@link module:engine/model/schema~SchemaContext} (context) instance and attribute name.\n\t * The callback may return `true/false` to override `checkAttribute()`'s return value. If it does not return\n\t * a boolean value, the default algorithm (or other callbacks) will define `checkAttribute()`'s return value.\n\t */\n\taddAttributeCheck( callback ) {\n\t\tthis.on( 'checkAttribute', ( evt, [ ctx, attributeName ] ) => {\n\t\t\tconst retValue = callback( ctx, attributeName );\n\n\t\t\tif ( typeof retValue == 'boolean' ) {\n\t\t\t\tevt.stop();\n\t\t\t\tevt.return = retValue;\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * Returns the lowest {@link module:engine/model/schema~Schema#isLimit limit element} containing the entire\n\t * selection/range/position or the root otherwise.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/range~Range|module:engine/model/position~Position} selectionOrRangeOrPosition\n\t * The selection/range/position to check.\n\t * @returns {module:engine/model/element~Element} The lowest limit element containing\n\t * the entire `selectionOrRangeOrPosition`.\n\t */\n\tgetLimitElement( selectionOrRangeOrPosition ) {\n\t\tlet element;\n\n\t\tif ( selectionOrRangeOrPosition instanceof Position ) {\n\t\t\telement = selectionOrRangeOrPosition.parent;\n\t\t} else {\n\t\t\tconst ranges = selectionOrRangeOrPosition instanceof Range ?\n\t\t\t\t[ selectionOrRangeOrPosition ] :\n\t\t\t\tArray.from( selectionOrRangeOrPosition.getRanges() );\n\n\t\t\t// Find the common ancestor for all selection's ranges.\n\t\t\telement = ranges\n\t\t\t\t.reduce( ( element, range ) => {\n\t\t\t\t\tconst rangeCommonAncestor = range.getCommonAncestor();\n\n\t\t\t\t\tif ( !element ) {\n\t\t\t\t\t\treturn rangeCommonAncestor;\n\t\t\t\t\t}\n\n\t\t\t\t\treturn element.getCommonAncestor( rangeCommonAncestor, { includeSelf: true } );\n\t\t\t\t}, null );\n\t\t}\n\n\t\twhile ( !this.isLimit( element ) ) {\n\t\t\tif ( element.parent ) {\n\t\t\t\telement = element.parent;\n\t\t\t} else {\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\treturn element;\n\t}\n\n\t/**\n\t * Checks whether the attribute is allowed in selection:\n\t *\n\t * * if the selection is not collapsed, then checks if the attribute is allowed on any of nodes in that range,\n\t * * if the selection is collapsed, then checks if on the selection position there's a text with the\n\t * specified attribute allowed.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * Selection which will be checked.\n\t * @param {String} attribute The name of the attribute to check.\n\t * @returns {Boolean}\n\t */\n\tcheckAttributeInSelection( selection, attribute ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\t// Check whether schema allows for a text with the attribute in the selection.\n\t\t\treturn this.checkAttribute( [ ...selection.getFirstPosition().getAncestors(), '$text' ], attribute );\n\t\t} else {\n\t\t\tconst ranges = selection.getRanges();\n\n\t\t\t// For all ranges, check nodes in them until you find a node that is allowed to have the attribute.\n\t\t\tfor ( const range of ranges ) {\n\t\t\t\tfor ( const value of range ) {\n\t\t\t\t\tif ( this.checkAttribute( value.item, attribute ) ) {\n\t\t\t\t\t\t// If we found a node that is allowed to have the attribute, return true.\n\t\t\t\t\t\treturn true;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// If we haven't found such node, return false.\n\t\treturn false;\n\t}\n\n\t/**\n\t * Transforms the given set of ranges into a set of ranges where the given attribute is allowed (and can be applied).\n\t *\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to be validated.\n\t * @param {String} attribute The name of the attribute to check.\n\t * @returns {Array.<module:engine/model/range~Range>} Ranges in which the attribute is allowed.\n\t */\n\tgetValidRanges( ranges, attribute ) {\n\t\tconst validRanges = [];\n\n\t\tfor ( const range of ranges ) {\n\t\t\tlet last = range.start;\n\t\t\tlet from = range.start;\n\t\t\tconst to = range.end;\n\n\t\t\tfor ( const value of range.getWalker() ) {\n\t\t\t\tif ( !this.checkAttribute( value.item, attribute ) ) {\n\t\t\t\t\tif ( !from.isEqual( last ) ) {\n\t\t\t\t\t\tvalidRanges.push( new Range( from, last ) );\n\t\t\t\t\t}\n\n\t\t\t\t\tfrom = value.nextPosition;\n\t\t\t\t}\n\n\t\t\t\tlast = value.nextPosition;\n\t\t\t}\n\n\t\t\tif ( from && !from.isEqual( to ) ) {\n\t\t\t\tvalidRanges.push( new Range( from, to ) );\n\t\t\t}\n\t\t}\n\n\t\treturn validRanges;\n\t}\n\n\t/**\n\t * Basing on given the `position`, finds and returns a {@link module:engine/model/range~Range range} which is\n\t * nearest to that `position` and is a correct range for selection.\n\t *\n\t * The correct selection range might be collapsed when it is located in a position where the text node can be placed.\n\t * Non-collapsed range is returned when selection can be placed around element marked as an \"object\" in\n\t * the {@link module:engine/model/schema~Schema schema}.\n\t *\n\t * Direction of searching for the nearest correct selection range can be specified as:\n\t *\n\t * * `both` - searching will be performed in both ways,\n\t * * `forward` - searching will be performed only forward,\n\t * * `backward` - searching will be performed only backward.\n\t *\n\t * When valid selection range cannot be found, `null` is returned.\n\t *\n\t * @param {module:engine/model/position~Position} position Reference position where new selection range should be looked for.\n\t * @param {'both'|'forward'|'backward'} [direction='both'] Search direction.\n\t * @returns {module:engine/model/range~Range|null} Nearest selection range or `null` if one cannot be found.\n\t */\n\tgetNearestSelectionRange( position, direction = 'both' ) {\n\t\t// Return collapsed range if provided position is valid.\n\t\tif ( this.checkChild( position, '$text' ) ) {\n\t\t\treturn new Range( position );\n\t\t}\n\n\t\tlet backwardWalker, forwardWalker;\n\n\t\tif ( direction == 'both' || direction == 'backward' ) {\n\t\t\tbackwardWalker = new TreeWalker( { startPosition: position, direction: 'backward' } );\n\t\t}\n\n\t\tif ( direction == 'both' || direction == 'forward' ) {\n\t\t\tforwardWalker = new TreeWalker( { startPosition: position } );\n\t\t}\n\n\t\tfor ( const data of combineWalkers( backwardWalker, forwardWalker ) ) {\n\t\t\tconst type = ( data.walker == backwardWalker ? 'elementEnd' : 'elementStart' );\n\t\t\tconst value = data.value;\n\n\t\t\tif ( value.type == type && this.isObject( value.item ) ) {\n\t\t\t\treturn Range.createOn( value.item );\n\t\t\t}\n\n\t\t\tif ( this.checkChild( value.nextPosition, '$text' ) ) {\n\t\t\t\treturn new Range( value.nextPosition );\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Tries to find position ancestors that allows to insert given node.\n\t * It starts searching from the given position and goes node by node to the top of the model tree\n\t * as long as {@link module:engine/model/schema~Schema#isLimit limit element},\n\t * {@link module:engine/model/schema~Schema#isObject object element} or top-most ancestor won't be reached.\n\t *\n\t * @params {module:engine/model/node~Node} node Node for which allowed parent should be found.\n\t * @params {module:engine/model/position~Position} position Position from searching will start.\n\t * @returns {module:engine/model/element~Element|null} element Allowed parent or null if nothing was found.\n\t */\n\tfindAllowedParent( node, position ) {\n\t\tlet parent = position.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( this.checkChild( parent, node ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\t// Do not split limit elements.\n\t\t\tif ( this.isLimit( parent ) ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Removes attributes disallowed by the schema.\n\t *\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes that will be filtered.\n\t * @param {module:engine/model/writer~Writer} writer\n\t */\n\tremoveDisallowedAttributes( nodes, writer ) {\n\t\tfor ( const node of nodes ) {\n\t\t\tfor ( const attribute of node.getAttributeKeys() ) {\n\t\t\t\tif ( !this.checkAttribute( node, attribute ) ) {\n\t\t\t\t\twriter.removeAttribute( attribute, node );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( node.is( 'element' ) ) {\n\t\t\t\tthis.removeDisallowedAttributes( node.getChildren(), writer );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_clearCache() {\n\t\tthis._compiledDefinitions = null;\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_compile() {\n\t\tconst compiledDefinitions = {};\n\t\tconst sourceRules = this._sourceDefinitions;\n\t\tconst itemNames = Object.keys( sourceRules );\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompiledDefinitions[ itemName ] = compileBaseItemRule( sourceRules[ itemName ], itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowContentOf( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowWhere( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcompileAllowAttributesOf( compiledDefinitions, itemName );\n\t\t\tcompileInheritPropertiesFrom( compiledDefinitions, itemName );\n\t\t}\n\n\t\tfor ( const itemName of itemNames ) {\n\t\t\tcleanUpAllowIn( compiledDefinitions, itemName );\n\t\t\tcleanUpAllowAttributes( compiledDefinitions, itemName );\n\t\t}\n\n\t\tthis._compiledDefinitions = compiledDefinitions;\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/schema~SchemaCompiledItemDefinition} def\n\t * @param {module:engine/model/schema~SchemaContext} context\n\t * @param {Number} contextItemIndex\n\t */\n\t_checkContextMatch( def, context, contextItemIndex = context.length - 1 ) {\n\t\tconst contextItem = context.getItem( contextItemIndex );\n\n\t\tif ( def.allowIn.includes( contextItem.name ) ) {\n\t\t\tif ( contextItemIndex == 0 ) {\n\t\t\t\treturn true;\n\t\t\t} else {\n\t\t\t\tconst parentRule = this.getDefinition( contextItem );\n\n\t\t\t\treturn this._checkContextMatch( parentRule, context, contextItemIndex - 1 );\n\t\t\t}\n\t\t} else {\n\t\t\treturn false;\n\t\t}\n\t}\n}\n\nmix( Schema, ObservableMixin );\n\n/**\n * Event fired when the {@link #checkChild} method is called. It allows plugging in\n * additional behavior – e.g. implementing rules which cannot be defined using the declarative\n * {@link module:engine/model/schema~SchemaItemDefinition} interface.\n *\n * **Note:** The {@link #addChildCheck} method is a more handy way to register callbacks. Internally,\n * it registers a listener to this event but comes with a simpler API and it is the recommended choice\n * in most of the cases.\n *\n * The {@link #checkChild} method fires an event because it is\n * {@link module:utils/observablemixin~ObservableMixin#decorate decorated} with it. Thanks to that you can\n * use this event in a various way, but the most important use case is overriding standard behaviour of the\n * `checkChild()` method. Let's see a typical listener template:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\t\t}, { priority: 'high' } );\n *\n * The listener is added with a `high` priority to be executed before the default method is really called. The `args` callback\n * parameter contains arguments passed to `checkChild( context, child )`. However, the `context` parameter is already\n * normalized to a {@link module:engine/model/schema~SchemaContext} instance and `child` to a\n * {@link module:engine/model/schema~SchemaCompiledItemDefinition} instance, so you don't have to worry about\n * the various ways how `context` and `child` may be passed to `checkChild()`.\n *\n * **Note:** `childDefinition` may be `undefined` if `checkChild()` was called with a non-registered element.\n *\n * So, in order to implement a rule \"disallow `heading1` in `blockQuote`\" you can add such a listener:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'blockQuote' ) && childDefinition && childDefinition.name == 'heading1' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkChild()'s return value.\n *\t\t\t\tevt.return = false;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * Allowing elements in specific contexts will be a far less common use case, because it's normally handled by\n * `allowIn` rule from {@link module:engine/model/schema~SchemaItemDefinition} but if you have a complex scenario\n * where `listItem` should be allowed only in element `foo` which must be in element `bar`, then this would be the way:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst childDefinition = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'bar foo' ) && childDefinition.name == 'listItem' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkChild()'s return value.\n *\t\t\t\tevt.return = true;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * @event checkChild\n * @param {Array} args The `checkChild()`'s arguments.\n */\n\n/**\n * Event fired when the {@link #checkAttribute} method is called. It allows plugging in\n * additional behavior – e.g. implementing rules which cannot be defined using the declarative\n * {@link module:engine/model/schema~SchemaItemDefinition} interface.\n *\n * **Note:** The {@link #addAttributeCheck} method is a more handy way to register callbacks. Internally,\n * it registers a listener to this event but comes with a simpler API and it is the recommended choice\n * in most of the cases.\n *\n * The {@link #checkAttribute} method fires an event because it's\n * {@link module:utils/observablemixin~ObservableMixin#decorate decorated} with it. Thanks to that you can\n * use this event in a various way, but the most important use case is overriding standard behaviour of the\n * `checkAttribute()` method. Let's see a typical listener template:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst attributeName = args[ 1 ];\n *\t\t}, { priority: 'high' } );\n *\n * The listener is added with a `high` priority to be executed before the default method is really called. The `args` callback\n * parameter contains arguments passed to `checkAttribute( context, attributeName )`. However, the `context` parameter is already\n * normalized to a {@link module:engine/model/schema~SchemaContext} instance, so you don't have to worry about\n * the various ways how `context` may be passed to `checkAttribute()`.\n *\n * So, in order to implement a rule \"disallow `bold` in a text which is in a `heading1` you can add such a listener:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst atributeName = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'heading1 $text' ) && attributeName == 'bold' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkAttribute()'s return value.\n *\t\t\t\tevt.return = false;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * Allowing attributes in specific contexts will be a far less common use case, because it's normally handled by\n * `allowAttributes` rule from {@link module:engine/model/schema~SchemaItemDefinition} but if you have a complex scenario\n * where `bold` should be allowed only in element `foo` which must be in element `bar`, then this would be the way:\n *\n *\t\tschema.on( 'checkAttribute', ( evt, args ) => {\n *\t\t\tconst context = args[ 0 ];\n *\t\t\tconst atributeName = args[ 1 ];\n *\n *\t\t\tif ( context.endsWith( 'bar foo $text' ) && attributeName == 'bold' ) {\n *\t\t\t\t// Prevent next listeners from being called.\n *\t\t\t\tevt.stop();\n *\t\t\t\t// Set the checkAttribute()'s return value.\n *\t\t\t\tevt.return = true;\n *\t\t\t}\n *\t\t}, { priority: 'high' } );\n *\n * @event checkAttribute\n * @param {Array} args The `checkAttribute()`'s arguments.\n */\n\n/**\n * A definition of a {@link module:engine/model/schema~Schema schema} item.\n *\n * You can define the following rules:\n *\n * * `allowIn` &ndash; A string or an array of strings. Defines in which other items this item will be allowed.\n * * `allowAttributes` &ndash; A string or an array of strings. Defines allowed attributes of the given item.\n * * `allowContentOf` &ndash; A string or an array of strings. Inherits \"allowed children\" from other items.\n * * `allowWhere` &ndash; A string or an array of strings. Inherits \"allowed in\" from other items.\n * * `allowAttributesOf` &ndash; A string or an array of strings. Inherits attributes from other items.\n * * `inheritTypesFrom` &ndash; A string or an array of strings. Inherits `is*` properties of other items.\n * * `inheritAllFrom` &ndash; A string. A shorthand for `allowContentOf`, `allowWhere`, `allowAttributesOf`, `inheritTypesFrom`.\n * * Additionally, you can define the following `is*` properties: `isBlock`, `isLimit`, `isObject`. Read about them below.\n *\n * # The is* properties\n *\n * There are 3 commonly used `is*` properties. Their role is to assign additional semantics to schema items.\n * You can define more properties but you will also need to implement support for them in the existing editor features.\n *\n * * `isBlock` &ndash; Whether this item is paragraph-like. Generally speaking, content is usually made out of blocks\n * like paragraphs, list items, images, headings, etc. All these elements are marked as blocks. A block\n * should not allow another block inside. Note: There is also the `$block` generic item which has `isBlock` set to `true`.\n * Most block type items will inherit from `$block` (through `inheritAllFrom`).\n * * `isLimit` &ndash; It can be understood as whether this element should not be split by <kbd>Enter</kbd>.\n * Examples of limit elements: `$root`, table cell, image caption, etc. In other words, all actions that happen inside\n * a limit element are limited to its content. **Note:** All objects (`isObject`) are treated as limit elements, too.\n * * `isObject` &ndash; Whether an item is \"self-contained\" and should be treated as a whole. Examples of object elements:\n * `image`, `table`, `video`, etc. **Note:** An object is also a limit, so\n * {@link module:engine/model/schema~Schema#isLimit `isLimit()`}\n * returns `true` for object elements automatically.\n *\n * # Generic items\n *\n * There are three basic generic items: `$root`, `$block` and `$text`.\n * They are defined as follows:\n *\n *\t\tthis.schema.register( '$root', {\n *\t\t\tisLimit: true\n *\t\t} );\n *\t\tthis.schema.register( '$block', {\n *\t\t\tallowIn: '$root',\n *\t\t\tisBlock: true\n *\t\t} );\n *\t\tthis.schema.register( '$text', {\n *\t\t\tallowIn: '$block'\n *\t\t} );\n *\n * They reflect typical editor content that is contained within one root, consists of several blocks\n * (paragraphs, lists items, headings, images) which, in turn, may contain text inside.\n *\n * By inheriting from the generic items you can define new items which will get extended by other editor features.\n * Read more about generic types in the {@linkTODO Defining schema} guide.\n *\n * # Example definitions\n *\n * Allow `paragraph` in roots and block quotes:\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tallowIn: [ '$root', 'blockQuote' ],\n *\t\t\tisBlock: true\n *\t\t} );\n *\n * Allow `paragraph` everywhere where `$block` is allowed (i.e. in `$root`):\n *\n *\t\tschema.register( 'paragraph', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tisBlock: true\n *\t\t} );\n *\n * Make `image` a block object, which is allowed everywhere where `$block` is.\n * Also, allow `src` and `alt` attributes in it:\n *\n *\t\tschema.register( 'image', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowAttributes: [ 'src', 'alt' ],\n *\t\t\tisBlock: true,\n *\t\t\tisObject: true\n *\t\t} );\n *\n * Make `caption` allowed in `image` and make it allow all the content of `$block`s (usually, `$text`).\n * Also, mark it as a limit element so it cannot be split:\n *\n *\t\tschema.register( 'caption', {\n *\t\t\tallowIn: 'image',\n *\t\t\tallowContentOf: '$block',\n *\t\t\tisLimit: true\n *\t\t} );\n *\n * Make `listItem` inherit all from `$block` but also allow additional attributes:\n *\n *\t\tschema.register( 'listItem', {\n *\t\t\tinheritAllFrom: '$block',\n *\t\t\tallowAttributes: [ 'listType', 'listIndent' ]\n *\t\t} );\n *\n * Which translates to:\n *\n *\t\tschema.register( 'listItem', {\n *\t\t\tallowWhere: '$block',\n *\t\t\tallowContentOf: '$block',\n *\t\t\tallowAttributesOf: '$block',\n *\t\t\tinheritTypesFrom: '$block',\n *\t\t\tallowAttributes: [ 'listType', 'listIndent' ]\n *\t\t} );\n *\n * # Tips\n *\n * * Check schema definitions of existing features to see how they are defined.\n * * If you want to publish your feature so other developers can use it, try to use\n * generic items as much as possible.\n * * Keep your model clean. Limit it to the actual data and store information in a normalized way.\n * * Remember about definining the `is*` properties. They do not affect the allowed structures, but they can\n * affect how the editor features treat your elements.\n *\n * @typedef {Object} module:engine/model/schema~SchemaItemDefinition\n */\n\n/**\n * A simplified version of {@link module:engine/model/schema~SchemaItemDefinition} after\n * compilation by the {@link module:engine/model/schema~Schema schema}.\n * Rules fed to the schema by {@link module:engine/model/schema~Schema#register}\n * and {@link module:engine/model/schema~Schema#extend} methods are defined in the\n * {@link module:engine/model/schema~SchemaItemDefinition} format.\n * Later on, they are compiled to `SchemaCompiledItemDefition` so when you use e.g.\n * the {@link module:engine/model/schema~Schema#getDefinition} method you get the compiled version.\n *\n * The compiled version contains only the following properties:\n *\n * * The `name` property,\n * * The `is*` properties,\n * * The `allowIn` array,\n * * The `allowAttributes` array.\n *\n * @typedef {Object} module:engine/model/schema~SchemaCompiledItemDefinition\n */\n\n/**\n * A schema context &mdash; a list of ancestors of a given position in the document.\n *\n * Considering such position:\n *\n *\t\t<$root>\n *\t\t\t<blockQuote>\n *\t\t\t\t<paragraph>\n *\t\t\t\t\t^\n *\t\t\t\t</paragraph>\n *\t\t\t</blockQuote>\n *\t\t</$root>\n *\n * The context of this position is its {@link module:engine/model/position~Position#getAncestors lists of ancestors}:\n *\n *\t\t[ rootElement, blockQuoteElement, paragraphElement ]\n *\n * Contexts are used in the {@link module:engine/model/schema~Schema#event:checkChild `Schema#checkChild`} and\n * {@link module:engine/model/schema~Schema#event:checkAttribute `Schema#checkAttribute`} events as a definition\n * of a place in the document where the check occurs. The context instances are created based on the first arguments\n * of the {@link module:engine/model/schema~Schema#checkChild `Schema#checkChild()`} and\n * {@link module:engine/model/schema~Schema#checkAttribute `Schema#checkAttribute()`} methods so when\n * using these methods you need to use {@link module:engine/model/schema~SchemaContextDefinition}s.\n */\nexport class SchemaContext {\n\t/**\n\t * Creates an instance of the context.\n\t *\n\t * @param {module:engine/model/schema~SchemaContextDefinition} context\n\t */\n\tconstructor( context ) {\n\t\tif ( context instanceof SchemaContext ) {\n\t\t\treturn context;\n\t\t}\n\n\t\tif ( typeof context == 'string' ) {\n\t\t\tcontext = [ context ];\n\t\t} else if ( !Array.isArray( context ) ) {\n\t\t\t// `context` is item or position.\n\t\t\t// Position#getAncestors() doesn't accept any parameters but it works just fine here.\n\t\t\tcontext = context.getAncestors( { includeSelf: true } );\n\t\t}\n\n\t\tif ( context[ 0 ] && typeof context[ 0 ] != 'string' && context[ 0 ].is( 'documentFragment' ) ) {\n\t\t\tcontext.shift();\n\t\t}\n\n\t\tthis._items = context.map( mapContextItem );\n\t}\n\n\t/**\n\t * The number of items.\n\t *\n\t * @type {Number}\n\t */\n\tget length() {\n\t\treturn this._items.length;\n\t}\n\n\t/**\n\t * The last item (the lowest node).\n\t *\n\t * @type {module:engine/model/schema~SchemaContextItem}\n\t */\n\tget last() {\n\t\treturn this._items[ this._items.length - 1 ];\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all context items.\n\t *\n\t * @returns {Iterable.<module:engine/model/schema~SchemaContextItem>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._items[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns a new schema context instance with an additional item.\n\t *\n\t * Item can be added as:\n\t *\n\t * \t\tconst context = new SchemaContext( [ '$root' ] );\n\t *\n\t * \t\t// An element.\n\t * \t\tconst fooElement = writer.createElement( 'fooElement' );\n\t * \t\tconst newContext = context.push( fooElement ); // [ '$root', 'fooElement' ]\n\t *\n\t * \t\t// A text node.\n\t * \t\tconst text = writer.createText( 'foobar' );\n\t * \t\tconst newContext = context.push( text ); // [ '$root', '$text' ]\n\t *\n\t * \t\t// A string (element name).\n\t * \t\tconst newContext = context.push( 'barElement' ); // [ '$root', 'barElement' ]\n\t *\n\t * **Note** {module:engine/model/node~Node} that is already in the model tree will be added as the only item (without ancestors).\n\t *\n\t * @param {String|module:engine/model/node~Node|Array<String|module:engine/model/node~Node>} item An item that will be added\n\t * to the current context.\n\t * @returns {module:engine/model/schema~SchemaContext} A new schema context instance with an additional item.\n\t */\n\tpush( item ) {\n\t\tconst ctx = new SchemaContext( [ item ] );\n\n\t\tctx._items = [ ...this._items, ...ctx._items ];\n\n\t\treturn ctx;\n\t}\n\n\t/**\n\t * Gets an item on the given index.\n\t *\n\t * @returns {module:engine/model/schema~SchemaContextItem}\n\t */\n\tgetItem( index ) {\n\t\treturn this._items[ index ];\n\t}\n\n\t/**\n\t * Returns the names of items.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* getNames() {\n\t\tyield* this._items.map( item => item.name );\n\t}\n\n\t/**\n\t * Checks whether the context ends with the given nodes.\n\t *\n\t *\t\tconst ctx = new SchemaContext( [ rootElement, paragraphElement, textNode ] );\n\t *\n\t *\t\tctx.endsWith( '$text' ); // -> true\n\t *\t\tctx.endsWith( 'paragraph $text' ); // -> true\n\t *\t\tctx.endsWith( '$root' ); // -> false\n\t *\t\tctx.endsWith( 'paragraph' ); // -> false\n\t *\n\t * @param {String} query\n\t * @returns {Boolean}\n\t */\n\tendsWith( query ) {\n\t\treturn Array.from( this.getNames() ).join( ' ' ).endsWith( query );\n\t}\n}\n\n/**\n * The definition of a {@link module:engine/model/schema~SchemaContext schema context}.\n *\n * Contexts can be created in multiple ways:\n *\n * * By defining a **node** – in this cases this node and all its ancestors will be used.\n * * By defining a **position** in the document – in this case all its ancestors will be used.\n * * By defining an **array of nodes** – in this case this array defines the entire context.\n * * By defining a **name of node** - in this case node will be \"mocked\". It is not recommended because context\n * will be unrealistic (e.g. attributes of these nodes are not specified). However, at times this may be the only\n * way to define the context (e.g. when checking some hypothetical situation).\n * * By defining an **array of node names** (potentially, mixed with real nodes) – The same as **name of node**\n * but it is possible to create a path.\n * * By defining a {@link module:engine/model/schema~SchemaContext} instance - in this case the same instance as provided\n * will be return.\n *\n * Examples of context definitions passed to the {@link module:engine/model/schema~Schema#checkChild `Schema#checkChild()`}\n * method:\n *\n *\t\t// Assuming that we have a $root > blockQuote > paragraph structure, the following code\n *\t\t// will check node 'foo' in the following context:\n *\t\t// [ rootElement, blockQuoteElement, paragraphElement ]\n *\t\tconst contextDefinition = paragraphElement;\n * \t\tconst childToCheck = 'foo';\n *\t\tschema.checkChild( contextDefinition, childToCheck );\n *\n *\t\t// Also check in [ rootElement, blockQuoteElement, paragraphElement ].\n *\t\tschema.checkChild( Position.createAt( paragraphElement ), 'foo' );\n *\n *\t\t// Check in [ rootElement, paragraphElement ].\n *\t\tschema.checkChild( [ rootElement, paragraphElement ], 'foo' );\n *\n *\t\t// Check only fakeParagraphElement.\n *\t\tschema.checkChild( 'paragraph', 'foo' );\n *\n *\t\t// Check in [ fakeRootElement, fakeBarElement, paragraphElement ].\n *\t\tschema.checkChild( [ '$root', 'bar', paragraphElement ], 'foo' );\n *\n * All these `checkChild()` calls will fire {@link module:engine/model/schema~Schema#event:checkChild `Schema#checkChild`}\n * events in which `args[ 0 ]` is an instance of the context. Therefore, you can write a listener like this:\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst ctx = args[ 0 ];\n *\n *\t\t\tconsole.log( Array.from( ctx.getNames() ) );\n *\t\t} );\n *\n * Which will log the following:\n *\n *\t\t[ '$root', 'blockQuote', 'paragraph' ]\n *\t\t[ '$root', 'paragraph' ]\n *\t\t[ '$root', 'bar', 'paragraph' ]\n *\n * Note: When using the {@link module:engine/model/schema~Schema#checkAttribute `Schema#checkAttribute()`} method\n * you may want to check whether a text node may have an attribute. A {@link module:engine/model/text~Text} is a\n * correct way to define a context so you can do this:\n *\n *\t\tschema.checkAttribute( textNode, 'bold' );\n *\n * But sometimes you want to check whether a text at a given position might've had some attribute,\n * in which case you can create a context by mising an array of elements with a `'$text'` string:\n *\n *\t\t// Check in [ rootElement, paragraphElement, textNode ].\n *\t\tschema.checkChild( [ ...positionInParagraph.getAncestors(), '$text' ], 'bold' );\n *\n * @typedef {module:engine/model/node~Node|module:engine/model/position~Position|module:engine/model/schema~SchemaContext|\n * String|Array.<String|module:engine/model/node~Node>} module:engine/model/schema~SchemaContextDefinition\n */\n\n/**\n * An item of the {@link module:engine/model/schema~SchemaContext schema context}.\n *\n * It contains 3 properties:\n *\n * * `name` – the name of this item,\n * * `* getAttributeKeys()` – a generator of keys of item attributes,\n * * `getAttribute( keyName )` – a method to get attribute values.\n *\n * The context item interface is a highly simplified version of {@link module:engine/model/node~Node} and its role\n * is to expose only the information which schema checks are able to provide (which is the name of the node and\n * node's attributes).\n *\n *\t\tschema.on( 'checkChild', ( evt, args ) => {\n *\t\t\tconst ctx = args[ 0 ];\n *\t\t\tconst firstItem = ctx.getItem( 0 );\n *\n *\t\t\tconsole.log( firstItem.name ); // -> '$root'\n *\t\t\tconsole.log( firstItem.getAttribute( 'foo' ) ); // -> 'bar'\n *\t\t\tconsole.log( Array.from( firstItem.getAttributeKeys() ) ); // -> [ 'foo', 'faa' ]\n *\t\t} );\n *\n * @typedef {Object} module:engine/model/schema~SchemaContextItem\n */\n\nfunction compileBaseItemRule( sourceItemRules, itemName ) {\n\tconst itemRule = {\n\t\tname: itemName,\n\n\t\tallowIn: [],\n\t\tallowContentOf: [],\n\t\tallowWhere: [],\n\n\t\tallowAttributes: [],\n\t\tallowAttributesOf: [],\n\n\t\tinheritTypesFrom: []\n\t};\n\n\tcopyTypes( sourceItemRules, itemRule );\n\n\tcopyProperty( sourceItemRules, itemRule, 'allowIn' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowContentOf' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowWhere' );\n\n\tcopyProperty( sourceItemRules, itemRule, 'allowAttributes' );\n\tcopyProperty( sourceItemRules, itemRule, 'allowAttributesOf' );\n\n\tcopyProperty( sourceItemRules, itemRule, 'inheritTypesFrom' );\n\n\tmakeInheritAllWork( sourceItemRules, itemRule );\n\n\treturn itemRule;\n}\n\nfunction compileAllowContentOf( compiledDefinitions, itemName ) {\n\tfor ( const allowContentOfItemName of compiledDefinitions[ itemName ].allowContentOf ) {\n\t\t// The allowContentOf property may point to an unregistered element.\n\t\tif ( compiledDefinitions[ allowContentOfItemName ] ) {\n\t\t\tconst allowedChildren = getAllowedChildren( compiledDefinitions, allowContentOfItemName );\n\n\t\t\tallowedChildren.forEach( allowedItem => {\n\t\t\t\tallowedItem.allowIn.push( itemName );\n\t\t\t} );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowContentOf;\n}\n\nfunction compileAllowWhere( compiledDefinitions, itemName ) {\n\tfor ( const allowWhereItemName of compiledDefinitions[ itemName ].allowWhere ) {\n\t\tconst inheritFrom = compiledDefinitions[ allowWhereItemName ];\n\n\t\t// The allowWhere property may point to an unregistered element.\n\t\tif ( inheritFrom ) {\n\t\t\tconst allowedIn = inheritFrom.allowIn;\n\n\t\t\tcompiledDefinitions[ itemName ].allowIn.push( ...allowedIn );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowWhere;\n}\n\nfunction compileAllowAttributesOf( compiledDefinitions, itemName ) {\n\tfor ( const allowAttributeOfItem of compiledDefinitions[ itemName ].allowAttributesOf ) {\n\t\tconst inheritFrom = compiledDefinitions[ allowAttributeOfItem ];\n\n\t\tif ( inheritFrom ) {\n\t\t\tconst inheritAttributes = inheritFrom.allowAttributes;\n\n\t\t\tcompiledDefinitions[ itemName ].allowAttributes.push( ...inheritAttributes );\n\t\t}\n\t}\n\n\tdelete compiledDefinitions[ itemName ].allowAttributesOf;\n}\n\nfunction compileInheritPropertiesFrom( compiledDefinitions, itemName ) {\n\tconst item = compiledDefinitions[ itemName ];\n\n\tfor ( const inheritPropertiesOfItem of item.inheritTypesFrom ) {\n\t\tconst inheritFrom = compiledDefinitions[ inheritPropertiesOfItem ];\n\n\t\tif ( inheritFrom ) {\n\t\t\tconst typeNames = Object.keys( inheritFrom ).filter( name => name.startsWith( 'is' ) );\n\n\t\t\tfor ( const name of typeNames ) {\n\t\t\t\tif ( !( name in item ) ) {\n\t\t\t\t\titem[ name ] = inheritFrom[ name ];\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\tdelete item.inheritTypesFrom;\n}\n\n// Remove items which weren't registered (because it may break some checks or we'd need to complicate them).\n// Make sure allowIn doesn't contain repeated values.\nfunction cleanUpAllowIn( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\tconst existingItems = itemRule.allowIn.filter( itemToCheck => compiledDefinitions[ itemToCheck ] );\n\n\titemRule.allowIn = Array.from( new Set( existingItems ) );\n}\n\nfunction cleanUpAllowAttributes( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\n\titemRule.allowAttributes = Array.from( new Set( itemRule.allowAttributes ) );\n}\n\nfunction copyTypes( sourceItemRules, itemRule ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tconst typeNames = Object.keys( sourceItemRule ).filter( name => name.startsWith( 'is' ) );\n\n\t\tfor ( const name of typeNames ) {\n\t\t\titemRule[ name ] = sourceItemRule[ name ];\n\t\t}\n\t}\n}\n\nfunction copyProperty( sourceItemRules, itemRule, propertyName ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tif ( typeof sourceItemRule[ propertyName ] == 'string' ) {\n\t\t\titemRule[ propertyName ].push( sourceItemRule[ propertyName ] );\n\t\t} else if ( Array.isArray( sourceItemRule[ propertyName ] ) ) {\n\t\t\titemRule[ propertyName ].push( ...sourceItemRule[ propertyName ] );\n\t\t}\n\t}\n}\n\nfunction makeInheritAllWork( sourceItemRules, itemRule ) {\n\tfor ( const sourceItemRule of sourceItemRules ) {\n\t\tconst inheritFrom = sourceItemRule.inheritAllFrom;\n\n\t\tif ( inheritFrom ) {\n\t\t\titemRule.allowContentOf.push( inheritFrom );\n\t\t\titemRule.allowWhere.push( inheritFrom );\n\t\t\titemRule.allowAttributesOf.push( inheritFrom );\n\t\t\titemRule.inheritTypesFrom.push( inheritFrom );\n\t\t}\n\t}\n}\n\nfunction getAllowedChildren( compiledDefinitions, itemName ) {\n\tconst itemRule = compiledDefinitions[ itemName ];\n\n\treturn getValues( compiledDefinitions ).filter( def => def.allowIn.includes( itemRule.name ) );\n}\n\nfunction getValues( obj ) {\n\treturn Object.keys( obj ).map( key => obj[ key ] );\n}\n\nfunction mapContextItem( ctxItem ) {\n\tif ( typeof ctxItem == 'string' ) {\n\t\treturn {\n\t\t\tname: ctxItem,\n\n\t\t\t* getAttributeKeys() {},\n\n\t\t\tgetAttribute() {}\n\t\t};\n\t} else {\n\t\treturn {\n\t\t\t// '$text' means text nodes and text proxies.\n\t\t\tname: ctxItem.is( 'element' ) ? ctxItem.name : '$text',\n\n\t\t\t* getAttributeKeys() {\n\t\t\t\tyield* ctxItem.getAttributeKeys();\n\t\t\t},\n\n\t\t\tgetAttribute( key ) {\n\t\t\t\treturn ctxItem.getAttribute( key );\n\t\t\t}\n\t\t};\n\t}\n}\n\n// Generator function returning values from provided walkers, switching between them at each iteration. If only one walker\n// is provided it will return data only from that walker.\n//\n// @param {module:engine/module/treewalker~TreeWalker} [backward] Walker iterating in backward direction.\n// @param {module:engine/module/treewalker~TreeWalker} [forward] Walker iterating in forward direction.\n// @returns {Iterable.<Object>} Object returned at each iteration contains `value` and `walker` (informing which walker returned\n// given value) fields.\nfunction* combineWalkers( backward, forward ) {\n\tlet done = false;\n\n\twhile ( !done ) {\n\t\tdone = true;\n\n\t\tif ( backward ) {\n\t\t\tconst step = backward.next();\n\n\t\t\tif ( !step.done ) {\n\t\t\t\tdone = false;\n\t\t\t\tyield {\n\t\t\t\t\twalker: backward,\n\t\t\t\t\tvalue: step.value\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\n\t\tif ( forward ) {\n\t\t\tconst step = forward.next();\n\n\t\t\tif ( !step.done ) {\n\t\t\t\tdone = false;\n\t\t\t\tyield {\n\t\t\t\t\twalker: forward,\n\t\t\t\t\tvalue: step.value\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/upcastdispatcher\n */\n\nimport ViewConsumable from './viewconsumable';\nimport ModelRange from '../model/range';\nimport ModelPosition from '../model/position';\nimport { SchemaContext } from '../model/schema';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * `UpcastDispatcher` is a central point of {@link module:engine/view/view view} conversion, which is a process of\n * converting given {@link module:engine/view/documentfragment~DocumentFragment view document fragment} or\n * {@link module:engine/view/element~Element} into another structure.\n * In default application, {@link module:engine/view/view view} is converted to {@link module:engine/model/model}.\n *\n * During conversion process, for all {@link module:engine/view/node~Node view nodes} from the converted view document fragment,\n * `UpcastDispatcher` fires corresponding events. Special callbacks called \"converters\" should listen to\n * `UpcastDispatcher` for those events.\n *\n * Each callback, as the second argument, is passed a special object `data` that has `viewItem`, `modelCursor` and\n * `modelRange` properties. `viewItem` property contains {@link module:engine/view/node~Node view node} or\n * {@link module:engine/view/documentfragment~DocumentFragment view document fragment}\n * that is converted at the moment and might be handled by the callback. `modelRange` property should be used to save the result\n * of conversion and is always a {@link module:engine/model/range~Range} when conversion result is correct.\n * `modelCursor` property is a {@link module:engine/model/position~Position position} on which conversion result will be inserted\n * and is a context according to {@link module:engine/model/schema~Schema schema} will be checked before the conversion.\n * See also {@link ~UpcastDispatcher#convert}. It is also shared by reference by all callbacks listening to given event.\n *\n * The third parameter passed to a callback is an instance of {@link ~UpcastDispatcher}\n * which provides additional tools for converters.\n *\n * Examples of providing callbacks for `UpcastDispatcher`:\n *\n *\t\t// Converter for links (<a>).\n *\t\tupcastDispatcher.on( 'element:a', ( evt, data, conversionApi ) => {\n *\t\t\tif ( conversionApi.consumable.consume( data.viewItem, { name: true, attributes: [ 'href' ] } ) ) {\n *\t\t\t\t// <a> element is inline and is represented by an attribute in the model.\n *\t\t\t\t// This is why we need to convert only children.\n *\t\t\t\tconst { modelRange } = conversionApi.convertChildren( data.viewItem, data.modelCursor );\n *\n *\t\t\t\tfor ( let item of modelRange.getItems() ) {\n *\t\t\t\t\tif ( conversionApi.schema.checkAttribute( item, 'linkHref' ) ) {\n *\t\t\t\t\t\tconversionApi.writer.setAttribute( 'linkHref', data.viewItem.getAttribute( 'href' ), item );\n *\t\t\t\t\t}\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n *\t\t// Convert all elements which have no custom converter into paragraph (autoparagraphing).\n *  \tdata.viewToModel.on( 'element', ( evt, data, conversionApi ) => {\n *  \t \t// When element is already consumed by higher priority converters then do nothing.\n *  \t \tif ( conversionApi.consumable.test( data.viewItem, { name: data.viewItem.name } ) ) {\n *  \t \t\t\tconst paragraph = conversionApi.writer.createElement( 'paragraph' );\n *\n *  \t \t\t\t// Find allowed parent for paragraph that we are going to insert. If current parent does not allow\n *  \t \t\t\t// to insert paragraph but one of the ancestors does then split nodes to allowed parent.\n *  \t \t\t\tconst splitResult = conversionApi.splitToAllowedParent( paragraph, data.modelCursor );\n *\n *  \t \t\t\t// When there is no split result it means that we can't insert paragraph in this position.\n *  \t \t\t\tif ( splitResult ) {\n *  \t \t\t\t\t// Insert paragraph in allowed position.\n *  \t \t\t\t\tconversionApi.writer.insert( paragraph, splitResult.position );\n *\n *  \t \t\t\t\t// Convert children to paragraph.\n *  \t \t\t\t\tconst { modelRange } = conversionApi.convertChildren( data.viewItem, Position.createAt( paragraph ) );\n *\n * \t\t\t\t\t\t// Set as conversion result, attribute converters may use this property.\n *  \t \t\t\t\tdata.modelRange = new Range( Position.createBefore( paragraph ), modelRange.end );\n *\n *  \t \t\t\t\t// Continue conversion inside paragraph.\n *  \t \t\t\t\tdata.modelCursor = data.modelRange.end;\n *  \t \t\t\t}\n *  \t \t\t}\n *  \t \t}\n *  \t }, { priority: 'low' } );\n *\n * Before each conversion process, `UpcastDispatcher` fires {@link ~UpcastDispatcher#event:viewCleanup}\n * event which can be used to prepare tree view for conversion.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n * @fires viewCleanup\n * @fires element\n * @fires text\n * @fires documentFragment\n */\nexport default class UpcastDispatcher {\n\t/**\n\t * Creates a `UpcastDispatcher` that operates using passed API.\n\t *\n\t * @see module:engine/conversion/upcastdispatcher~ViewConversionApi\n\t * @param {Object} [conversionApi] Additional properties for interface that will be passed to events fired\n\t * by `UpcastDispatcher`.\n\t */\n\tconstructor( conversionApi = {} ) {\n\t\t/**\n\t\t * List of elements that will be checked after conversion process and if element in the list will be empty it\n\t\t * will be removed from conversion result.\n\t\t *\n\t\t * After conversion process list is cleared.\n\t\t *\n\t\t * @protected\n\t\t * @type {Set<module:engine/model/element~Element>}\n\t\t */\n\t\tthis._removeIfEmpty = new Set();\n\n\t\t/**\n\t\t * Position in the temporary structure where the converted content is inserted. The structure reflect the context of\n\t\t * the target position where the content will be inserted. This property is build based on the context parameter of the\n\t\t * convert method.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/model/position~Position|null}\n\t\t */\n\t\tthis._modelCursor = null;\n\n\t\t/**\n\t\t * Interface passed by dispatcher to the events callbacks.\n\t\t *\n\t\t * @member {module:engine/conversion/upcastdispatcher~ViewConversionApi}\n\t\t */\n\t\tthis.conversionApi = Object.assign( {}, conversionApi );\n\n\t\t// `convertItem`, `convertChildren` and `splitToAllowedParent` are bound to this `UpcastDispatcher`\n\t\t// instance and set on `conversionApi`. This way only a part of `UpcastDispatcher` API is exposed.\n\t\tthis.conversionApi.convertItem = this._convertItem.bind( this );\n\t\tthis.conversionApi.convertChildren = this._convertChildren.bind( this );\n\t\tthis.conversionApi.splitToAllowedParent = this._splitToAllowedParent.bind( this );\n\t}\n\n\t/**\n\t * Starts the conversion process. The entry point for the conversion.\n\t *\n\t * @fires element\n\t * @fires text\n\t * @fires documentFragment\n\t * @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/element~Element} viewItem\n\t * Part of the view to be converted.\n\t * @param {module:engine/model/writer~Writer} writer Instance of model writer.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context=['$root']] Elements will be converted according to this context.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Model data that is a result of the conversion process\n\t * wrapped in `DocumentFragment`. Converted marker elements will be set as that document fragment's\n\t * {@link module:engine/model/documentfragment~DocumentFragment#markers static markers map}.\n\t */\n\tconvert( viewItem, writer, context = [ '$root' ] ) {\n\t\tthis.fire( 'viewCleanup', viewItem );\n\n\t\t// Create context tree and set position in the top element.\n\t\t// Items will be converted according to this position.\n\t\tthis._modelCursor = createContextTree( context, writer );\n\n\t\t// Store writer in conversion as a conversion API\n\t\t// to be sure that conversion process will use the same batch.\n\t\tthis.conversionApi.writer = writer;\n\n\t\t// Create consumable values list for conversion process.\n\t\tthis.conversionApi.consumable = ViewConsumable.createFrom( viewItem );\n\n\t\t// Custom data stored by converter for conversion process.\n\t\tthis.conversionApi.store = {};\n\n\t\t// Do the conversion.\n\t\tconst { modelRange } = this._convertItem( viewItem, this._modelCursor );\n\n\t\t// Conversion result is always a document fragment so let's create this fragment.\n\t\tconst documentFragment = writer.createDocumentFragment();\n\n\t\t// When there is a conversion result.\n\t\tif ( modelRange ) {\n\t\t\t// Remove all empty elements that was added to #_removeIfEmpty list.\n\t\t\tthis._removeEmptyElements();\n\n\t\t\t// Move all items that was converted to context tree to document fragment.\n\t\t\tfor ( const item of Array.from( this._modelCursor.parent.getChildren() ) ) {\n\t\t\t\twriter.append( item, documentFragment );\n\t\t\t}\n\n\t\t\t// Extract temporary markers elements from model and set as static markers collection.\n\t\t\tdocumentFragment.markers = extractMarkersFromModelFragment( documentFragment, writer );\n\t\t}\n\n\t\t// Clear context position.\n\t\tthis._modelCursor = null;\n\n\t\t// Clear split elements.\n\t\tthis._removeIfEmpty.clear();\n\n\t\t// Clear conversion API.\n\t\tthis.conversionApi.writer = null;\n\t\tthis.conversionApi.store = null;\n\n\t\t// Return fragment as conversion result.\n\t\treturn documentFragment;\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~ViewConversionApi#convertItem\n\t */\n\t_convertItem( viewItem, modelCursor ) {\n\t\tconst data = Object.assign( { viewItem, modelCursor, modelRange: null } );\n\n\t\tif ( viewItem.is( 'element' ) ) {\n\t\t\tthis.fire( 'element:' + viewItem.name, data, this.conversionApi );\n\t\t} else if ( viewItem.is( 'text' ) ) {\n\t\t\tthis.fire( 'text', data, this.conversionApi );\n\t\t} else {\n\t\t\tthis.fire( 'documentFragment', data, this.conversionApi );\n\t\t}\n\n\t\t// Handle incorrect conversion result.\n\t\tif ( data.modelRange && !( data.modelRange instanceof ModelRange ) ) {\n\t\t\t/**\n\t\t\t * Incorrect conversion result was dropped.\n\t\t\t *\n\t\t\t * {@link module:engine/model/range~Range Model range} should be a conversion result.\n\t\t\t *\n\t\t\t * @error view-conversion-dispatcher-incorrect-result\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-conversion-dispatcher-incorrect-result: Incorrect conversion result was dropped.' );\n\t\t}\n\n\t\treturn { modelRange: data.modelRange, modelCursor: data.modelCursor };\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~ViewConversionApi#convertChildren\n\t */\n\t_convertChildren( viewItem, modelCursor ) {\n\t\tconst modelRange = new ModelRange( modelCursor );\n\t\tlet nextModelCursor = modelCursor;\n\n\t\tfor ( const viewChild of Array.from( viewItem.getChildren() ) ) {\n\t\t\tconst result = this._convertItem( viewChild, nextModelCursor );\n\n\t\t\tif ( result.modelRange instanceof ModelRange ) {\n\t\t\t\tmodelRange.end = result.modelRange.end;\n\t\t\t\tnextModelCursor = result.modelCursor;\n\t\t\t}\n\t\t}\n\n\t\treturn { modelRange, modelCursor: nextModelCursor };\n\t}\n\n\t/**\n\t * @private\n\t * @see module:engine/conversion/upcastdispatcher~ViewConversionApi#splitToAllowedParent\n\t */\n\t_splitToAllowedParent( node, modelCursor ) {\n\t\t// Try to find allowed parent.\n\t\tconst allowedParent = this.conversionApi.schema.findAllowedParent( node, modelCursor );\n\n\t\t// When there is no parent that allows to insert node then return `null`.\n\t\tif ( !allowedParent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When current position parent allows to insert node then return this position.\n\t\tif ( allowedParent === modelCursor.parent ) {\n\t\t\treturn { position: modelCursor };\n\t\t}\n\n\t\t// When allowed parent is in context tree.\n\t\tif ( this._modelCursor.parent.getAncestors().includes( allowedParent ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Split element to allowed parent.\n\t\tconst splitResult = this.conversionApi.writer.split( modelCursor, allowedParent );\n\n\t\t// Remember all elements that are created as a result of split.\n\t\t// This is important because at the end of conversion we want to remove all empty split elements.\n\t\t//\n\t\t// Loop through positions between elements in range (except split result position) and collect parents.\n\t\t// <notSplit><split1><split2>[pos]</split2>[pos]</split1>[omit]<split1>[pos]<split2>[pos]</split2></split1></notSplit>\n\t\tfor ( const position of splitResult.range.getPositions() ) {\n\t\t\tif ( !position.isEqual( splitResult.position ) ) {\n\t\t\t\tthis._removeIfEmpty.add( position.parent );\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tposition: splitResult.position,\n\t\t\tcursorParent: splitResult.range.end.parent\n\t\t};\n\t}\n\n\t/**\n\t * Checks if {@link #_removeIfEmpty} contains empty elements and remove them.\n\t * We need to do it smart because there could be elements that are not empty because contains\n\t * other empty elements and after removing its children they become available to remove.\n\t * We need to continue iterating over split elements as long as any element will be removed.\n\t *\n\t * @private\n\t */\n\t_removeEmptyElements() {\n\t\tlet removed = false;\n\n\t\tfor ( const element of this._removeIfEmpty ) {\n\t\t\tif ( element.isEmpty ) {\n\t\t\t\tthis.conversionApi.writer.remove( element );\n\t\t\t\tthis._removeIfEmpty.delete( element );\n\t\t\t\tremoved = true;\n\t\t\t}\n\t\t}\n\n\t\tif ( removed ) {\n\t\t\tthis._removeEmptyElements();\n\t\t}\n\t}\n\n\t/**\n\t * Fired before the first conversion event, at the beginning of upcast (view to model conversion) process.\n\t *\n\t * @event viewCleanup\n\t * @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/element~Element}\n\t * viewItem Part of the view to be converted.\n\t */\n\n\t/**\n\t * Fired when {@link module:engine/view/element~Element} is converted.\n\t *\n\t * `element` is a namespace event for a class of events. Names of actually called events follow this pattern:\n\t * `element:<elementName>` where `elementName` is the name of converted element. This way listeners may listen to\n\t * all elements conversion or to conversion of specific elements.\n\t *\n\t * @event element\n\t * @param {Object} data Conversion data. Keep in mind that this object is shared by reference between all\n\t * callbacks that will be called. This means that callbacks can override values if needed, and those values will\n\t * be available in other callbacks.\n\t * @param {module:engine/view/item~Item} data.viewItem Converted item.\n\t * @param {module:engine/model/position~Position} data.modelCursor Position where a converter should start changes.\n\t * Change this value for the next converter to tell where the conversion should continue.\n\t * @param {module:engine/model/range~Range} data.modelRange The current state of conversion result. Every change to\n\t * converted element should be reflected by setting or modifying this property.\n\t * @param {ViewConversionApi} conversionApi Conversion utilities to be used by callback.\n\t */\n\n\t/**\n\t * Fired when {@link module:engine/view/text~Text} is converted.\n\t *\n\t * @event text\n\t * @see #event:element\n\t */\n\n\t/**\n\t * Fired when {@link module:engine/view/documentfragment~DocumentFragment} is converted.\n\t *\n\t * @event documentFragment\n\t * @see #event:element\n\t */\n}\n\nmix( UpcastDispatcher, EmitterMixin );\n\n// Traverses given model item and searches elements which marks marker range. Found element is removed from\n// DocumentFragment but path of this element is stored in a Map which is then returned.\n//\n// @param {module:engine/view/documentfragment~DocumentFragment|module:engine/view/node~Node} modelItem Fragment of model.\n// @returns {Map<String, module:engine/model/range~Range>} List of static markers.\nfunction extractMarkersFromModelFragment( modelItem, writer ) {\n\tconst markerElements = new Set();\n\tconst markers = new Map();\n\n\t// Create ModelTreeWalker.\n\tconst range = ModelRange.createIn( modelItem ).getItems();\n\n\t// Walk through DocumentFragment and collect marker elements.\n\tfor ( const item of range ) {\n\t\t// Check if current element is a marker.\n\t\tif ( item.name == '$marker' ) {\n\t\t\tmarkerElements.add( item );\n\t\t}\n\t}\n\n\t// Walk through collected marker elements store its path and remove its from the DocumentFragment.\n\tfor ( const markerElement of markerElements ) {\n\t\tconst markerName = markerElement.getAttribute( 'data-name' );\n\t\tconst currentPosition = ModelPosition.createBefore( markerElement );\n\n\t\t// When marker of given name is not stored it means that we have found the beginning of the range.\n\t\tif ( !markers.has( markerName ) ) {\n\t\t\tmarkers.set( markerName, new ModelRange( ModelPosition.createFromPosition( currentPosition ) ) );\n\t\t// Otherwise is means that we have found end of the marker range.\n\t\t} else {\n\t\t\tmarkers.get( markerName ).end = ModelPosition.createFromPosition( currentPosition );\n\t\t}\n\n\t\t// Remove marker element from DocumentFragment.\n\t\twriter.remove( markerElement );\n\t}\n\n\treturn markers;\n}\n\n// Creates model fragment according to given context and returns position in top element.\nfunction createContextTree( contextDefinition, writer ) {\n\tlet position;\n\n\tfor ( const item of new SchemaContext( contextDefinition ) ) {\n\t\tconst attributes = {};\n\n\t\tfor ( const key of item.getAttributeKeys() ) {\n\t\t\tattributes[ key ] = item.getAttribute( key );\n\t\t}\n\n\t\tconst current = writer.createElement( item.name, attributes );\n\n\t\tif ( position ) {\n\t\t\twriter.append( current, position );\n\t\t}\n\n\t\tposition = ModelPosition.createAt( current );\n\t}\n\n\treturn position;\n}\n\n/**\n * Conversion interface that is registered for given {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher}\n * and is passed as one of parameters when {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher dispatcher}\n * fires it's events.\n *\n * @interface ViewConversionApi\n */\n\n/**\n * Starts conversion of given item by firing an appropriate event.\n *\n * Every fired event is passed (as first parameter) an object with `modelRange` property. Every event may set and/or\n * modify that property. When all callbacks are done, the final value of `modelRange` property is returned by this method.\n * The `modelRange` must be {@link module:engine/model/range~Range model range} or `null` (as set by default).\n *\n * @method #convertItem\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:text\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:documentFragment\n * @param {module:engine/view/item~Item} viewItem Item to convert.\n * @param {module:engine/model/position~Position} modelCursor Position of conversion.\n * @returns {Object} result Conversion result.\n * @returns {module:engine/model/range~Range|null} result.modelRange Model range containing result of item conversion,\n * created and modified by callbacks attached to fired event, or `null` if the conversion result was incorrect.\n * @returns {module:engine/model/position~Position} result.modelCursor Position where conversion should be continued.\n */\n\n/**\n * Starts conversion of all children of given item by firing appropriate events for all those children.\n *\n * @method #convertChildren\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:text\n * @fires module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:documentFragment\n * @param {module:engine/view/item~Item} viewItem Item to convert.\n * @param {module:engine/model/position~Position} modelCursor Position of conversion.\n * @returns {Object} result Conversion result.\n * @returns {module:engine/model/range~Range} result.modelRange Model range containing results of conversion of all children of given item.\n * When no children was converted then range is collapsed.\n * @returns {module:engine/model/position~Position} result.modelCursor Position where conversion should be continued.\n */\n\n/**\n * Checks {@link module:engine/model/schema~Schema schema} to find allowed parent for element that we are going to insert\n * starting from given position. If current parent does not allow to insert element but one of the ancestors does then\n * split nodes to allowed parent.\n *\n * If schema allows to insert node in given position, nothing is split and object with that position is returned.\n *\n * If it was not possible to find allowed parent, `null` is returned, nothing is split.\n *\n * Otherwise, ancestors are split and object with position and the copy of the split element is returned.\n *\n * For instance, if `<image>` is not allowed in `<paragraph>` but is allowed in `$root`:\n *\n *\t\t<paragraph>foo[]bar</paragraph>\n *\n *  \t-> split for `<image>` ->\n *\n *  \t<paragraph>foo</paragraph>[]<paragraph>bar</paragraph>\n *\n * In the sample above position between `<paragraph>` elements will be returned as `position` and the second `paragraph`\n * as `cursorParent`.\n *\n * @method #splitToAllowedParent\n * @param {module:engine/model/position~Position} position Position on which element is going to be inserted.\n * @param {module:engine/model/node~Node} node Node to insert.\n * @returns {Object|null} Split result. If it was not possible to find allowed position `null` is returned.\n * @returns {module:engine/model/position~Position} position between split elements.\n * @returns {module:engine/model/element~Element} [cursorParent] Element inside which cursor should be placed to\n * continue conversion. When element is not defined it means that there was no split.\n */\n\n/**\n * Instance of {@link module:engine/conversion/viewconsumable~ViewConsumable}. It stores\n * information about what parts of processed view item are still waiting to be handled. After a piece of view item\n * was converted, appropriate consumable value should be {@link module:engine/conversion/viewconsumable~ViewConsumable#consume consumed}.\n *\n * @param {Object} #consumable\n */\n\n/**\n * Custom data stored by converters for conversion process. Custom properties of this object can be defined and use to\n * pass parameters between converters.\n *\n * The difference between this property and `data` parameter of\n * {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element} is that `data` parameters allows you\n * to pass parameters within a single event and `store` within the whole conversion.\n *\n * @param {Object} #store\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport Matcher from '../view/matcher';\n\nimport ModelRange from '../model/range';\nimport ModelPosition from '../model/position';\n\nimport cloneDeep from '@ckeditor/ckeditor5-utils/src/lib/lodash/cloneDeep';\n\n/**\n * Contains {@link module:engine/view/view view} to {@link module:engine/model/model model} converters for\n * {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher}.\n *\n * @module engine/conversion/upcast-converters\n */\n\n/**\n * View element to model element conversion helper.\n *\n * This conversion results in creating a model element. For example, view `<p>Foo</p>` becomes `<paragraph>Foo</paragraph>` in the model.\n *\n * Keep in mind that the element will be inserted only if it is allowed by {@link module:engine/model/schema~Schema schema} configuration.\n *\n *\t\tupcastElementToElement( { view: 'p', model: 'paragraph' } );\n *\n *\t\tupcastElementToElement( { view: 'p', model: 'paragraph', converterPriority: 'high' } );\n *\n *\t\tupcastElementToElement( {\n *\t\t\tview: {\n *\t\t\t\tname: 'p',\n *\t\t\t\tclasses: 'fancy'\n *\t\t\t},\n *\t\t\tmodel: 'fancyParagraph'\n *\t\t} );\n *\n *\t\tupcastElementToElement( {\n * \t\t\tview: {\n *\t\t\t\tname: 'p',\n *\t\t\t\tclasses: 'heading'\n * \t\t\t},\n * \t\t\tmodel: ( viewElement, modelWriter ) => {\n * \t\t\t\treturn modelWriter.createElement( 'heading', { level: viewElement.getAttribute( 'data-level' ) } );\n * \t\t\t}\n * \t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add converter to conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n * @param {String|module:engine/model/element~Element|Function} config.model Name of the model element, a model element\n * instance or a function that takes a view element and returns a model element. The model element will be inserted in the model.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function upcastElementToElement( config ) {\n\tconfig = cloneDeep( config );\n\n\tconst converter = _prepareToElementConverter( config );\n\n\tconst elementName = _getViewElementNameFromConfig( config );\n\tconst eventName = elementName ? 'element:' + elementName : 'element';\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, converter, { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * View element to model attribute conversion helper.\n *\n * This conversion results in setting an attribute on a model node. For example, view `<strong>Foo</strong>` becomes\n * `Foo` {@link module:engine/model/text~Text model text node} with `bold` attribute set to `true`.\n *\n * This helper is meant to set a model attribute on all the elements that are inside the converted element:\n *\n *\t\t<strong>Foo</strong>   -->   <strong><p>Foo</p></strong>   -->   <paragraph><$text bold=\"true\">Foo</$text></paragraph>\n *\n * Above is a sample of HTML code, that goes through autoparagraphing (first step) and then is converted (second step).\n * Even though `<strong>` is over `<p>` element, `bold=\"true\"` was added to the text. See\n * {@link module:engine/conversion/upcast-converters~upcastAttributeToAttribute} for comparison.\n *\n * Keep in mind that the attribute will be set only if it is allowed by {@link module:engine/model/schema~Schema schema} configuration.\n *\n *\t\tupcastElementToAttribute( { view: 'strong', model: 'bold' } );\n *\n *\t\tupcastElementToAttribute( { view: 'strong', model: 'bold', converterPriority: 'high' } );\n *\n *\t\tupcastElementToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tclasses: 'bold'\n *\t\t\t},\n *\t\t\tmodel: 'bold'\n *\t\t} );\n *\n *\t\tupcastElementToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tclasses: [ 'styled', 'styled-dark' ]\n *\t\t\t},\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'styled',\n *\t\t\t\tvalue: 'dark'\n *\t\t\t}\n *\t\t} );\n *\n * \t\tupcastElementToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tstyles: {\n *\t\t\t\t\t'font-size': /[\\s\\S]+/\n *\t\t\t\t}\n *\t\t\t},\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'fontSize',\n *\t\t\t\tvalue: viewElement => {\n *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n *\t\t\t\t\tconst value = fontSize.substr( 0, fontSize.length - 2 );\n *\n *\t\t\t\t\tif ( value <= 10 ) {\n *\t\t\t\t\t\treturn 'small';\n *\t\t\t\t\t} else if ( value > 12 ) {\n *\t\t\t\t\t\treturn 'big';\n *\t\t\t\t\t}\n *\n *\t\t\t\t\treturn null;\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add converter to conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n * @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n * the model attribute. `value` property may be set as a function that takes a view element and returns the value.\n * If `String` is given, the model attribute value will be set to `true`.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function upcastElementToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\t_normalizeModelAttributeConfig( config );\n\n\tconst converter = _prepareToAttributeConverter( config, false );\n\n\tconst elementName = _getViewElementNameFromConfig( config );\n\tconst eventName = elementName ? 'element:' + elementName : 'element';\n\n\treturn dispatcher => {\n\t\tdispatcher.on( eventName, converter, { priority: config.converterPriority || 'normal' } );\n\t};\n}\n\n/**\n * View attribute to model attribute conversion helper.\n *\n * This conversion results in setting an attribute on a model node. For example, view `<img src=\"foo.jpg\"></img>` becomes\n * `<image source=\"foo.jpg\"></image>` in the model.\n *\n * This helper is meant to convert view attributes from view elements which got converted to the model, so the view attribute\n * is set only on the corresponding model node:\n *\n *\t\t<div class=\"dark\"><div>foo</div></div>    -->    <div dark=\"true\"><div>foo</div></div>\n *\n * Above, `class=\"dark\"` attribute is added only to the `<div>` elements that has it. This is in contrary to\n * {@link module:engine/conversion/upcast-converters~upcastElementToAttribute} which sets attributes for all the children in the model:\n *\n *\t\t<strong>Foo</strong>   -->   <strong><p>Foo</p></strong>   -->   <paragraph><$text bold=\"true\">Foo</$text></paragraph>\n *\n * Above is a sample of HTML code, that goes through autoparagraphing (first step) and then is converted (second step).\n * Even though `<strong>` is over `<p>` element, `bold=\"true\"` was added to the text.\n *\n * Keep in mind that the attribute will be set only if it is allowed by {@link module:engine/model/schema~Schema schema} configuration.\n *\n *\t\tupcastAttributeToAttribute( { view: 'src', model: 'source' } );\n *\n *\t\tupcastAttributeToAttribute( { view: { key: 'src' }, model: 'source' } );\n *\n *\t\tupcastAttributeToAttribute( { view: { key: 'src' }, model: 'source', converterPriority: 'normal' } );\n *\n *\t\tupcastAttributeToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tkey: 'data-style',\n *\t\t\t\tvalue: /[\\s\\S]+/\n *\t\t\t},\n *\t\t\tmodel: 'styled'\n *\t\t} );\n *\n *\t\tupcastAttributeToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tname: 'img',\n *\t\t\t\tkey: 'class',\n *\t\t\t\tvalue: 'styled-dark'\n *\t\t\t},\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'styled',\n *\t\t\t\tvalue: 'dark'\n *\t\t\t}\n *\t\t} );\n *\n *\t\tupcastAttributeToAttribute( {\n *\t\t\tview: {\n *\t\t\t\tkey: 'class',\n *\t\t\t\tvalue: /styled-[\\S]+/\n *\t\t\t},\n *\t\t\tmodel: {\n *\t\t\t\tkey: 'styled'\n *\t\t\t\tvalue: viewElement => {\n *\t\t\t\t\tconst regexp = /styled-([\\S]+)/;\n *\t\t\t\t\tconst match = viewElement.getAttribute( 'class' ).match( regexp );\n *\n *\t\t\t\t\treturn match[ 1 ];\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add converter to conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {String|Object} config.view Specifies which view attribute will be converted. If a `String` is passed,\n * attributes with given key will be converted. If an `Object` is passed, it must have a required `key` property,\n * specifying view attribute key, and may have an optional `value` property, specifying view attribute value and optional `name`\n * property specifying a view element name from/on which the attribute should be converted. `value` can be given as a `String`,\n * a `RegExp` or a function callback, that takes view attribute value as the only parameter and returns `Boolean`.\n * @param {String|Object} config.model Model attribute key or an object with `key` and `value` properties, describing\n * the model attribute. `value` property may be set as a function that takes a view element and returns the value.\n * If `String` is given, the model attribute value will be same as view attribute value.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='low'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function upcastAttributeToAttribute( config ) {\n\tconfig = cloneDeep( config );\n\n\tlet viewKey = null;\n\n\tif ( typeof config.view == 'string' || config.view.key ) {\n\t\tviewKey = _normalizeViewAttributeKeyValueConfig( config );\n\t}\n\n\t_normalizeModelAttributeConfig( config, viewKey );\n\n\tconst converter = _prepareToAttributeConverter( config, true );\n\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element', converter, { priority: config.converterPriority || 'low' } );\n\t};\n}\n\n/**\n * View element to model marker conversion helper.\n *\n * This conversion results in creating a model marker. For example, if the marker was stored in a view as an element:\n * `<p>Fo<span data-marker=\"comment\" data-comment-id=\"7\"></span>o</p><p>B<span data-marker=\"comment\" data-comment-id=\"7\"></span>ar</p>`,\n * after the conversion is done, the marker will be available in\n * {@link module:engine/model/model~Model#markers model document markers}.\n *\n *\t\tupcastElementToMarker( { view: 'marker-search', model: 'search' } );\n *\n *\t\tupcastElementToMarker( { view: 'marker-search', model: 'search', converterPriority: 'high' } );\n *\n *\t\tupcastElementToMarker( {\n *\t\t\tview: 'marker-search',\n *\t\t\tmodel: viewElement => 'comment:' + viewElement.getAttribute( 'data-comment-id' )\n *\t\t} );\n *\n *\t\tupcastElementToMarker( {\n *\t\t\tview: {\n *\t\t\t\tname: 'span',\n *\t\t\t\tattributes: {\n *\t\t\t\t\t'data-marker': 'search'\n *\t\t\t\t}\n *\t\t\t},\n *\t\t\tmodel: 'search'\n *\t\t} );\n *\n * See {@link module:engine/conversion/conversion~Conversion#for} to learn how to add converter to conversion process.\n *\n * @param {Object} config Conversion configuration.\n * @param {module:engine/view/matcher~MatcherPattern} config.view Pattern matching all view elements which should be converted.\n * @param {String|Function} config.model Name of the model marker, or a function that takes a view element and returns\n * a model marker name.\n * @param {module:utils/priorities~PriorityString} [config.converterPriority='normal'] Converter priority.\n * @returns {Function} Conversion helper.\n */\nexport function upcastElementToMarker( config ) {\n\tconfig = cloneDeep( config );\n\n\t_normalizeToMarkerConfig( config );\n\n\treturn upcastElementToElement( config );\n}\n\n// Helper function for from-view-element conversion. Checks if `config.view` directly specifies converted view element's name\n// and if so, returns it.\n//\n// @param {Object} config Conversion config.\n// @returns {String|null} View element name or `null` if name is not directly set.\nfunction _getViewElementNameFromConfig( config ) {\n\tif ( typeof config.view == 'string' ) {\n\t\treturn config.view;\n\t}\n\n\tif ( typeof config.view == 'object' && typeof config.view.name == 'string' ) {\n\t\treturn config.view.name;\n\t}\n\n\treturn null;\n}\n\n// Helper for to-model-element conversion. Takes a config object and returns a proper converter function.\n//\n// @param {Object} config Conversion configuration.\n// @returns {Function} View to model converter.\nfunction _prepareToElementConverter( config ) {\n\tconst matcher = new Matcher( config.view );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\t// This will be usually just one pattern but we support matchers with many patterns too.\n\t\tconst match = matcher.match( data.viewItem );\n\n\t\t// If there is no match, this callback should not do anything.\n\t\tif ( !match ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Force consuming element's name.\n\t\tmatch.match.name = true;\n\n\t\t// Create model element basing on config.\n\t\tconst modelElement = _getModelElement( config.model, data.viewItem, conversionApi.writer );\n\n\t\t// Do not convert if element building function returned falsy value.\n\t\tif ( !modelElement ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// When element was already consumed then skip it.\n\t\tif ( !conversionApi.consumable.test( data.viewItem, match.match ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Find allowed parent for element that we are going to insert.\n\t\t// If current parent does not allow to insert element but one of the ancestors does\n\t\t// then split nodes to allowed parent.\n\t\tconst splitResult = conversionApi.splitToAllowedParent( modelElement, data.modelCursor );\n\n\t\t// When there is no split result it means that we can't insert element to model tree, so let's skip it.\n\t\tif ( !splitResult ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Insert element on allowed position.\n\t\tconversionApi.writer.insert( modelElement, splitResult.position );\n\n\t\t// Convert children and insert to element.\n\t\tconst childrenResult = conversionApi.convertChildren( data.viewItem, ModelPosition.createAt( modelElement ) );\n\n\t\t// Consume appropriate value from consumable values list.\n\t\tconversionApi.consumable.consume( data.viewItem, match.match );\n\n\t\t// Set conversion result range.\n\t\tdata.modelRange = new ModelRange(\n\t\t\t// Range should start before inserted element\n\t\t\tModelPosition.createBefore( modelElement ),\n\t\t\t// Should end after but we need to take into consideration that children could split our\n\t\t\t// element, so we need to move range after parent of the last converted child.\n\t\t\t// before: <allowed>[]</allowed>\n\t\t\t// after: <allowed>[<converted><child></child></converted><child></child><converted>]</converted></allowed>\n\t\t\tModelPosition.createAfter( childrenResult.modelCursor.parent )\n\t\t);\n\n\t\t// Now we need to check where the modelCursor should be.\n\t\t// If we had to split parent to insert our element then we want to continue conversion inside split parent.\n\t\t//\n\t\t// before: <allowed><notAllowed>[]</notAllowed></allowed>\n\t\t// after:  <allowed><notAllowed></notAllowed><converted></converted><notAllowed>[]</notAllowed></allowed>\n\t\tif ( splitResult.cursorParent ) {\n\t\t\tdata.modelCursor = ModelPosition.createAt( splitResult.cursorParent );\n\n\t\t\t// Otherwise just continue after inserted element.\n\t\t} else {\n\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t}\n\t};\n}\n\n// Helper function for upcasting-to-element converter. Takes the model configuration, the converted view element\n// and a writer instance and returns a model element instance to be inserted in the model.\n//\n// @param {String|Function|module:engine/model/element~Element} model Model conversion configuration.\n// @param {module:engine/view/node~Node} input The converted view node.\n// @param {module:engine/model/writer~Writer} writer A writer instance to use to create the model element.\nfunction _getModelElement( model, input, writer ) {\n\tif ( model instanceof Function ) {\n\t\treturn model( input, writer );\n\t} else {\n\t\treturn writer.createElement( model );\n\t}\n}\n\n// Helper function view-attribute-to-model-attribute helper. Normalizes `config.view` which was set as `String` or\n// as an `Object` with `key`, `value` and `name` properties. Normalized `config.view` has is compatible with\n// {@link module:engine/view/matcher~MatcherPattern}.\n//\n// @param {Object} config Conversion config.\n// @returns {String} Key of the converted view attribute.\nfunction _normalizeViewAttributeKeyValueConfig( config ) {\n\tif ( typeof config.view == 'string' ) {\n\t\tconfig.view = { key: config.view };\n\t}\n\n\tconst key = config.view.key;\n\tlet normalized;\n\n\tif ( key == 'class' || key == 'style' ) {\n\t\tconst keyName = key == 'class' ? 'classes' : 'styles';\n\n\t\tnormalized = {\n\t\t\t[ keyName ]: config.view.value\n\t\t};\n\t} else {\n\t\tconst value = typeof config.view.value == 'undefined' ? /[\\s\\S]*/ : config.view.value;\n\n\t\tnormalized = {\n\t\t\tattributes: {\n\t\t\t\t[ key ]: value\n\t\t\t}\n\t\t};\n\t}\n\n\tif ( config.view.name ) {\n\t\tnormalized.name = config.view.name;\n\t}\n\n\tconfig.view = normalized;\n\n\treturn key;\n}\n\n// Helper function that normalizes `config.model` in from-model-attribute conversion. `config.model` can be set\n// as a `String`, an `Object` with only `key` property or an `Object` with `key` and `value` properties. Normalized\n// `config.model` is an `Object` with `key` and `value` properties.\n//\n// @param {Object} config Conversion config.\n// @param {String} viewAttributeKeyToCopy Key of the converted view attribute. If it is set, model attribute value\n// will be equal to view attribute value.\nfunction _normalizeModelAttributeConfig( config, viewAttributeKeyToCopy = null ) {\n\tconst defaultModelValue = viewAttributeKeyToCopy === null ? true : viewElement => viewElement.getAttribute( viewAttributeKeyToCopy );\n\n\tconst key = typeof config.model != 'object' ? config.model : config.model.key;\n\tconst value = typeof config.model != 'object' || typeof config.model.value == 'undefined' ? defaultModelValue : config.model.value;\n\n\tconfig.model = { key, value };\n}\n\n// Helper for to-model-attribute conversion. Takes the model attribute name and conversion configuration and returns\n// a proper converter function.\n//\n// @param {String} modelAttributeKey The key of the model attribute to set on a model node.\n// @param {Object|Array.<Object>} config Conversion configuration. It is possible to provide multiple configurations in an array.\n// @param {Boolean} shallow If set to `true` the attribute will be set only on top-level nodes. Otherwise, it will be set\n// on all elements in the range.\nfunction _prepareToAttributeConverter( config, shallow ) {\n\tconst matcher = new Matcher( config.view );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\tconst match = matcher.match( data.viewItem );\n\n\t\t// If there is no match, this callback should not do anything.\n\t\tif ( !match ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst modelKey = config.model.key;\n\t\tconst modelValue = typeof config.model.value == 'function' ? config.model.value( data.viewItem ) : config.model.value;\n\n\t\t// Do not convert if attribute building function returned falsy value.\n\t\tif ( modelValue === null ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( _onlyViewNameIsDefined( config ) ) {\n\t\t\tmatch.match.name = true;\n\t\t} else {\n\t\t\t// Do not test or consume `name` consumable.\n\t\t\tdelete match.match.name;\n\t\t}\n\n\t\t// Try to consume appropriate values from consumable values list.\n\t\tif ( !conversionApi.consumable.test( data.viewItem, match.match ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Since we are converting to attribute we need an range on which we will set the attribute.\n\t\t// If the range is not created yet, we will create it.\n\t\tif ( !data.modelRange ) {\n\t\t\t// Convert children and set conversion result as a current data.\n\t\t\tdata = Object.assign( data, conversionApi.convertChildren( data.viewItem, data.modelCursor ) );\n\t\t}\n\n\t\t// Set attribute on current `output`. `Schema` is checked inside this helper function.\n\t\tconst attributeWasSet = _setAttributeOn( data.modelRange, { key: modelKey, value: modelValue }, shallow, conversionApi );\n\n\t\tif ( attributeWasSet ) {\n\t\t\tconversionApi.consumable.consume( data.viewItem, match.match );\n\t\t}\n\t};\n}\n\n// Helper function that checks if element name should be consumed in attribute converters.\n//\n// @param {Object} config Conversion config.\n// @returns {Boolean}\nfunction _onlyViewNameIsDefined( config ) {\n\tif ( typeof config.view == 'object' && !_getViewElementNameFromConfig( config ) ) {\n\t\treturn false;\n\t}\n\n\treturn !config.view.classes && !config.view.attributes && !config.view.styles;\n}\n\n// Helper function for to-model-attribute converter. Sets model attribute on given range. Checks {@link module:engine/model/schema~Schema}\n// to ensure proper model structure.\n//\n// @param {module:engine/model/range~Range} modelRange Model range on which attribute should be set.\n// @param {Object} modelAttribute Model attribute to set.\n// @param {Object} conversionApi Conversion API.\n// @param {Boolean} shallow If set to `true` the attribute will be set only on top-level nodes. Otherwise, it will be set\n// on all elements in the range.\n// @returns {Boolean} `true` if attribute was set on at least one node from given `modelRange`.\nfunction _setAttributeOn( modelRange, modelAttribute, shallow, conversionApi ) {\n\tlet result = false;\n\n\t// Set attribute on each item in range according to Schema.\n\tfor ( const node of Array.from( modelRange.getItems( { shallow } ) ) ) {\n\t\tif ( conversionApi.schema.checkAttribute( node, modelAttribute.key ) ) {\n\t\t\tconversionApi.writer.setAttribute( modelAttribute.key, modelAttribute.value, node );\n\n\t\t\tresult = true;\n\t\t}\n\t}\n\n\treturn result;\n}\n\n// Helper function for upcasting-to-marker conversion. Takes the config in a format requested by `upcastElementToMarker()`\n// function and converts it to a format that is supported by `upcastElementToElement()` function.\n//\n// @param {Object} config Conversion configuration.\nfunction _normalizeToMarkerConfig( config ) {\n\tconst oldModel = config.model;\n\n\tconfig.model = ( viewElement, modelWriter ) => {\n\t\tconst markerName = typeof oldModel == 'string' ? oldModel : oldModel( viewElement );\n\n\t\treturn modelWriter.createElement( '$marker', { 'data-name': markerName } );\n\t};\n}\n\n/**\n * Function factory, creates a converter that converts {@link module:engine/view/documentfragment~DocumentFragment view document fragment}\n * or all children of {@link module:engine/view/element~Element} into\n * {@link module:engine/model/documentfragment~DocumentFragment model document fragment}.\n * This is the \"entry-point\" converter for upcast (view to model conversion). This converter starts the conversion of all children\n * of passed view document fragment. Those children {@link module:engine/view/node~Node view nodes} are then handled by other converters.\n *\n * This also a \"default\", last resort converter for all view elements that has not been converted by other converters.\n * When a view element is being converted to the model but it does not have converter specified, that view element\n * will be converted to {@link module:engine/model/documentfragment~DocumentFragment model document fragment} and returned.\n *\n * @returns {Function} Universal converter for view {@link module:engine/view/documentfragment~DocumentFragment fragments} and\n * {@link module:engine/view/element~Element elements} that returns\n * {@link module:engine/model/documentfragment~DocumentFragment model fragment} with children of converted view item.\n */\nexport function convertToModelFragment() {\n\treturn ( evt, data, conversionApi ) => {\n\t\t// Second argument in `consumable.consume` is discarded for ViewDocumentFragment but is needed for ViewElement.\n\t\tif ( !data.modelRange && conversionApi.consumable.consume( data.viewItem, { name: true } ) ) {\n\t\t\tconst { modelRange, modelCursor } = conversionApi.convertChildren( data.viewItem, data.modelCursor );\n\n\t\t\tdata.modelRange = modelRange;\n\t\t\tdata.modelCursor = modelCursor;\n\t\t}\n\t};\n}\n\n/**\n * Function factory, creates a converter that converts {@link module:engine/view/text~Text} to {@link module:engine/model/text~Text}.\n *\n * @returns {Function} {@link module:engine/view/text~Text View text} converter.\n */\nexport function convertText() {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( conversionApi.schema.checkChild( data.modelCursor, '$text' ) ) {\n\t\t\tif ( conversionApi.consumable.consume( data.viewItem ) ) {\n\t\t\t\tconst text = conversionApi.writer.createText( data.viewItem.data );\n\n\t\t\t\tconversionApi.writer.insert( text, data.modelCursor );\n\n\t\t\t\tdata.modelRange = ModelRange.createFromPositionAndShift( data.modelCursor, text.offsetSize );\n\t\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t\t}\n\t\t}\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/controller/datacontroller\n */\n\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport Mapper from '../conversion/mapper';\n\nimport DowncastDispatcher from '../conversion/downcastdispatcher';\nimport { insertText } from '../conversion/downcast-converters';\n\nimport UpcastDispatcher from '../conversion/upcastdispatcher';\nimport { convertText, convertToModelFragment } from '../conversion/upcast-converters';\n\nimport ViewDocumentFragment from '../view/documentfragment';\nimport ViewDocument from '../view/document';\nimport ViewWriter from '../view/writer';\n\nimport ModelRange from '../model/range';\n\n/**\n * Controller for the data pipeline. The data pipeline controls how data is retrieved from the document\n * and set inside it. Hence, the controller features two methods which allow to {@link ~DataController#get get}\n * and {@link ~DataController#set set} data of the {@link ~DataController#model model}\n * using given:\n *\n * * {@link module:engine/dataprocessor/dataprocessor~DataProcessor data processor},\n * * downcast converters,\n * * upcast converters.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class DataController {\n\t/**\n\t * Creates a data controller instance.\n\t *\n\t * @param {module:engine/model/model~Model} model Data model.\n\t * @param {module:engine/dataprocessor/dataprocessor~DataProcessor} [dataProcessor] Data processor that should be used\n\t * by the controller.\n\t */\n\tconstructor( model, dataProcessor ) {\n\t\t/**\n\t\t * Data model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Data processor used during the conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/dataProcessor~DataProcessor}\n\t\t */\n\t\tthis.processor = dataProcessor;\n\n\t\t/**\n\t\t * Mapper used for the conversion. It has no permanent bindings, because they are created when getting data and\n\t\t * cleared directly after the data are converted. However, the mapper is defined as a class property, because\n\t\t * it needs to be passed to the `DowncastDispatcher` as a conversion API.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/mapper~Mapper}\n\t\t */\n\t\tthis.mapper = new Mapper();\n\n\t\t/**\n\t\t * Downcast dispatcher used by the {@link #get get method}. Downcast converters should be attached to it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/downcastdispatcher~DowncastDispatcher}\n\t\t */\n\t\tthis.downcastDispatcher = new DowncastDispatcher( {\n\t\t\tmapper: this.mapper\n\t\t} );\n\t\tthis.downcastDispatcher.on( 'insert:$text', insertText(), { priority: 'lowest' } );\n\n\t\t/**\n\t\t * Upcast dispatcher used by the {@link #set set method}. Upcast converters should be attached to it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/upcastdispatcher~UpcastDispatcher}\n\t\t */\n\t\tthis.upcastDispatcher = new UpcastDispatcher( {\n\t\t\tschema: model.schema\n\t\t} );\n\n\t\t// Define default converters for text and elements.\n\t\t//\n\t\t// Note that if there is no default converter for the element it will be skipped, for instance `<b>foo</b>` will be\n\t\t// converted to nothing. We add `convertToModelFragment` as a last converter so it converts children of that\n\t\t// element to the document fragment so `<b>foo</b>` will be converted to `foo` if there is no converter for `<b>`.\n\t\tthis.upcastDispatcher.on( 'text', convertText(), { priority: 'lowest' } );\n\t\tthis.upcastDispatcher.on( 'element', convertToModelFragment(), { priority: 'lowest' } );\n\t\tthis.upcastDispatcher.on( 'documentFragment', convertToModelFragment(), { priority: 'lowest' } );\n\n\t\tthis.decorate( 'init' );\n\t}\n\n\t/**\n\t * Returns the model's data converted by downcast dispatchers attached to {@link #downcastDispatcher} and\n\t * formatted by the {@link #processor data processor}.\n\t *\n\t * @param {String} [rootName='main'] Root name.\n\t * @returns {String} Output data.\n\t */\n\tget( rootName = 'main' ) {\n\t\t// Get model range.\n\t\treturn this.stringify( this.model.document.getRoot( rootName ) );\n\t}\n\n\t/**\n\t * Returns the content of the given {@link module:engine/model/element~Element model's element} or\n\t * {@link module:engine/model/documentfragment~DocumentFragment model document fragment} converted by the downcast converters\n\t * attached to {@link #downcastDispatcher} and formatted by the {@link #processor data processor}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} modelElementOrFragment\n\t * Element whose content will be stringified.\n\t * @returns {String} Output data.\n\t */\n\tstringify( modelElementOrFragment ) {\n\t\t// Model -> view.\n\t\tconst viewDocumentFragment = this.toView( modelElementOrFragment );\n\n\t\t// View -> data.\n\t\treturn this.processor.toData( viewDocumentFragment );\n\t}\n\n\t/**\n\t * Returns the content of the given {@link module:engine/model/element~Element model element} or\n\t * {@link module:engine/model/documentfragment~DocumentFragment model document fragment} converted by the downcast\n\t * converters attached to {@link #downcastDispatcher} to a\n\t * {@link module:engine/view/documentfragment~DocumentFragment view document fragment}.\n\t *\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} modelElementOrFragment\n\t * Element or document fragment whose content will be converted.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} Output view DocumentFragment.\n\t */\n\ttoView( modelElementOrFragment ) {\n\t\t// First, convert elements.\n\t\tconst modelRange = ModelRange.createIn( modelElementOrFragment );\n\n\t\tconst viewDocumentFragment = new ViewDocumentFragment();\n\n\t\t// Create separate ViewWriter just for data conversion purposes.\n\t\t// We have no view controller and rendering do DOM in DataController so view.change() block is not used here.\n\t\tconst viewWriter = new ViewWriter( new ViewDocument() );\n\t\tthis.mapper.bindElements( modelElementOrFragment, viewDocumentFragment );\n\n\t\tthis.downcastDispatcher.convertInsert( modelRange, viewWriter );\n\n\t\tif ( !modelElementOrFragment.is( 'documentFragment' ) ) {\n\t\t\t// Then, if a document element is converted, convert markers.\n\t\t\t// From all document markers, get those, which \"intersect\" with the converter element.\n\t\t\tconst markers = _getMarkersRelativeToElement( modelElementOrFragment );\n\n\t\t\tfor ( const [ name, range ] of markers ) {\n\t\t\t\tthis.downcastDispatcher.convertMarkerAdd( name, range, viewWriter );\n\t\t\t}\n\t\t}\n\n\t\t// Clear bindings so the next call to this method gives correct results.\n\t\tthis.mapper.clearBindings();\n\n\t\treturn viewDocumentFragment;\n\t}\n\n\t/**\n\t * Sets initial input data parsed by the {@link #processor data processor} and\n\t * converted by the {@link #upcastDispatcher view-to-model converters}.\n\t * Initial data can be set only to document that {@link module:engine/model/document~Document#version} is equal 0.\n\t *\n\t * **Note** This method is {@link module:utils/observablemixin~ObservableMixin#decorate decorated} which is\n\t * used by e.g. collaborative editing plugin that syncs remote data on init.\n\t *\n\t * @fires init\n\t * @param {String} data Input data.\n\t * @param {String} [rootName='main'] Root name.\n\t * @returns {Promise} Promise that is resolved after the data is set on the editor.\n\t */\n\tinit( data, rootName = 'main' ) {\n\t\tif ( this.model.document.version ) {\n\t\t\t/**\n\t\t\t * Cannot set initial data to not empty {@link module:engine/model/document~Document}.\n\t\t\t * Initial data should be set once, during {@link module:core/editor/editor~Editor} initialization,\n\t\t\t * when the {@link module:engine/model/document~Document#version} is equal 0.\n\t\t\t *\n\t\t\t * @error datacontroller-init-document-not-empty\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'datacontroller-init-document-not-empty: Trying to set initial data to not empty document.' );\n\t\t}\n\n\t\tconst modelRoot = this.model.document.getRoot( rootName );\n\n\t\tthis.model.enqueueChange( 'transparent', writer => {\n\t\t\twriter.insert( this.parse( data, modelRoot ), modelRoot );\n\t\t} );\n\n\t\treturn Promise.resolve();\n\t}\n\n\t/**\n\t * Sets input data parsed by the {@link #processor data processor} and\n\t * converted by the {@link #upcastDispatcher view-to-model converters}.\n\t * This method can be used any time to replace existing editor data by the new one without clearing the\n\t * {@link module:engine/model/document~Document#history document history}.\n\t *\n\t * This method also creates a batch with all the changes applied. If all you need is to parse data, use\n\t * the {@link #parse} method.\n\t *\n\t * @param {String} data Input data.\n\t * @param {String} [rootName='main'] Root name.\n\t */\n\tset( data, rootName = 'main' ) {\n\t\t// Save to model.\n\t\tconst modelRoot = this.model.document.getRoot( rootName );\n\n\t\tthis.model.enqueueChange( 'transparent', writer => {\n\t\t\twriter.setSelection( null );\n\t\t\twriter.removeSelectionAttribute( this.model.document.selection.getAttributeKeys() );\n\n\t\t\twriter.remove( ModelRange.createIn( modelRoot ) );\n\t\t\twriter.insert( this.parse( data, modelRoot ), modelRoot );\n\t\t} );\n\t}\n\n\t/**\n\t * Returns the data parsed by the {@link #processor data processor} and then converted by upcast converters\n\t * attached to the {@link #upcastDispatcher}.\n\t *\n\t * @see #set\n\t * @param {String} data Data to parse.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context='$root'] Base context in which the view will\n\t * be converted to the model. See: {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#convert}.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Parsed data.\n\t */\n\tparse( data, context = '$root' ) {\n\t\t// data -> view\n\t\tconst viewDocumentFragment = this.processor.toView( data );\n\n\t\t// view -> model\n\t\treturn this.toModel( viewDocumentFragment, context );\n\t}\n\n\t/**\n\t * Returns the result of the given {@link module:engine/view/element~Element view element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment view document fragment} converted by the\n\t * {@link #upcastDispatcher view-to-model converters}, wrapped by {module:engine/model/documentfragment~DocumentFragment}.\n\t *\n\t * When marker elements were converted during the conversion process, it will be set as a document fragment's\n\t * {@link module:engine/model/documentfragment~DocumentFragment#markers static markers map}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElementOrFragment\n\t * Element or document fragment whose content will be converted.\n\t * @param {module:engine/model/schema~SchemaContextDefinition} [context='$root'] Base context in which the view will\n\t * be converted to the model. See: {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#convert}.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Output document fragment.\n\t */\n\ttoModel( viewElementOrFragment, context = '$root' ) {\n\t\treturn this.model.change( writer => {\n\t\t\treturn this.upcastDispatcher.convert( viewElementOrFragment, writer, context );\n\t\t} );\n\t}\n\n\t/**\n\t * Removes all event listeners set by the DataController.\n\t */\n\tdestroy() {}\n\n\t/**\n\t * Event fired by decorated {@link #init} method.\n\t * See {@link module:utils/observablemixin~ObservableMixin.decorate} for more information and samples.\n\t *\n\t * @event init\n\t */\n}\n\nmix( DataController, ObservableMixin );\n\n// Helper function for downcast conversion.\n//\n// Takes a document element (element that is added to a model document) and checks which markers are inside it\n// and which markers are containing it. If the marker is intersecting with element, the intersection is returned.\nfunction _getMarkersRelativeToElement( element ) {\n\tconst result = [];\n\tconst doc = element.root.document;\n\n\tif ( !doc ) {\n\t\treturn [];\n\t}\n\n\tconst elementRange = ModelRange.createIn( element );\n\n\tfor ( const marker of doc.model.markers ) {\n\t\tconst intersection = elementRange.getIntersection( marker.getRange() );\n\n\t\tif ( intersection ) {\n\t\t\tresult.push( [ marker.name, intersection ] );\n\t\t}\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/conversion/conversion\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport {\n\tdowncastElementToElement,\n\tdowncastAttributeToElement,\n\tdowncastAttributeToAttribute\n} from './downcast-converters';\n\nimport {\n\tupcastElementToElement,\n\tupcastElementToAttribute,\n\tupcastAttributeToAttribute\n} from './upcast-converters';\n\n/**\n * A utility class that helps add converters to upcast and downcast dispatchers.\n *\n * We recommend reading the {@glink framework/guides/architecture/editing-engine Editing engine architecture} guide first to\n * understand the core concepts of the conversion mechanisms.\n *\n * The instance of the conversion manager is available in the\n * {@link module:core/editor/editor~Editor#conversion `editor.conversion`} property\n * and by default has the following groups of dispatchers (i.e. directions of conversion):\n *\n * * `downcast` (editing and data downcasts)\n * * `editingDowncast`\n * * `dataDowncast`\n * * `upcast`\n *\n * To add a converter to a specific group, use the {@link module:engine/conversion/conversion~Conversion#for `for()`}\n * method:\n *\n *\t\t// Add a converter to editing downcast and data downcast.\n *\t\teditor.conversion.for( 'downcast' ).add( downcastElementToElement( config ) );\n *\n *\t\t// Add a converter to the data pipepline only:\n *\t\teditor.conversion.for( 'dataDowncast' ).add( downcastElementToElement( config ) );\n *\t\t// And a slightly different one for the editing pipeline:\n *\t\teditor.conversion.for( 'editingDowncast' ).add( downcastElementToWidget( config ) );\n *\n * The functions used in `add()` calls are one-way converters (i.e. you need to remember yourself to add\n * a converter in the other direction, if your feature requires that). They are also called \"conversion helpers\".\n * You can find a set of them in the {@link module:engine/conversion/downcast-converters} and\n * {@link module:engine/conversion/upcast-converters} modules.\n *\n * Besides allowing to register converters to specific dispatchers, you can also use methods available in this\n * class to add two-way converters (upcast and downcast):\n *\n * * {@link module:engine/conversion/conversion~Conversion#elementToElement `elementToElement()`} &ndash;\n * Model element to view element and vice versa.\n * * {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement()`} &ndash;\n * Model attribute to view element and vice versa.\n * * {@link module:engine/conversion/conversion~Conversion#attributeToElement `attributeToElement()`} &ndash;\n * Model attribute to view element and vice versa.\n */\nexport default class Conversion {\n\t/**\n\t * Creates a new conversion instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._dispatchersGroups = new Map();\n\t}\n\n\t/**\n\t * Registers one or more converters under a given group name. The group name can then be used to assign a converter\n\t * to multiple dispatchers at once.\n\t *\n\t * If a given group name is used for the second time, the\n\t * {@link module:utils/ckeditorerror~CKEditorError `conversion-register-group-exists` error} is thrown.\n\t *\n\t * @param {String} groupName The name for dispatchers group.\n\t * @param {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * module:engine/conversion/upcastdispatcher~UpcastDispatcher>} dispatchers Dispatchers to register\n\t * under the given name.\n\t */\n\tregister( groupName, dispatchers ) {\n\t\tif ( this._dispatchersGroups.has( groupName ) ) {\n\t\t\t/**\n\t\t\t * Trying to register a group name that was already registered.\n\t\t\t *\n\t\t\t * @error conversion-register-group-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'conversion-register-group-exists: Trying to register a group name that was already registered.' );\n\t\t}\n\n\t\tthis._dispatchersGroups.set( groupName, dispatchers );\n\t}\n\n\t/**\n\t * Provides chainable API to assign converters to dispatchers registered under a given group name. Converters are added\n\t * by calling the `.add()` method of an object returned by this function.\n\t *\n\t *\t\tconversion.for( 'downcast' )\n\t *\t\t\t.add( conversionHelperA )\n\t *\t\t\t.add( conversionHelperB );\n\t *\n\t * In this example `conversionHelperA` and `conversionHelperB` will be called for all dispatchers from the `'model'` group.\n\t *\n\t * The `.add()` method takes exactly one parameter, which is a function. This function should accept one parameter that\n\t * is a dispatcher instance. The function should add an actual converter to the passed dispatcher instance.\n\t *\n\t * Conversion helpers for most common cases are already provided. They are flexible enough to cover most use cases.\n\t * See the documentation to learn how they can be configured.\n\t *\n\t * For downcast (model-to-view conversion), these are:\n\t *\n\t * * {@link module:engine/conversion/downcast-converters~downcastElementToElement Downcast element-to-element converter},\n\t * * {@link module:engine/conversion/downcast-converters~downcastAttributeToElement Downcast attribute-to-element converter},\n\t * * {@link module:engine/conversion/downcast-converters~downcastAttributeToAttribute Downcast attribute-to-attribute converter}.\n\t *\n\t * For upcast (view-to-model conversion), these are:\n\t *\n\t * * {@link module:engine/conversion/upcast-converters~upcastElementToElement Upcast element-to-element converter},\n\t * * {@link module:engine/conversion/upcast-converters~upcastElementToAttribute Upcast attribute-to-element converter},\n\t * * {@link module:engine/conversion/upcast-converters~upcastAttributeToAttribute Upcast attribute-to-attribute converter}.\n\t *\n\t * An example of using conversion helpers to convert the `paragraph` model element to the `p` view element (and back):\n\t *\n\t *\t\t// Define conversion configuration - model element 'paragraph' should be converted to view element 'p'.\n\t *\t\tconst config = { model: 'paragraph', view: 'p' };\n\t *\n\t *\t\t// Add converters to proper dispatchers using conversion helpers.\n\t *\t\tconversion.for( 'downcast' ).add( downcastElementToElement( config ) );\n\t *\t\tconversion.for( 'upcast' ).add( upcastElementToElement( config ) );\n\t *\n\t * An example of providing a custom conversion helper that uses a custom converter function:\n\t *\n\t *\t\t// Adding a custom `myConverter` converter for 'paragraph' element insertion, with the default priority ('normal').\n\t *\t\tconversion.for( 'downcast' ).add( conversion.customConverter( 'insert:paragraph', myConverter ) );\n\t *\n\t * @param {String} groupName The name of dispatchers group to add the converters to.\n\t * @returns {Object} An object with the `.add()` method, providing a way to add converters.\n\t */\n\tfor( groupName ) {\n\t\tconst dispatchers = this._getDispatchers( groupName );\n\n\t\treturn {\n\t\t\tadd( conversionHelper ) {\n\t\t\t\t_addToDispatchers( dispatchers, conversionHelper );\n\n\t\t\t\treturn this;\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model element to a view element (and vice versa).\n\t * For example, the model `<paragraph>Foo</paragraph>` is `<p>Foo</p>` in the view.\n\t *\n\t *\t\t// A simple conversion from the `paragraph` model element to the `<p>` view element (and vice versa).\n\t *\t\tconversion.elementToElement( { model: 'paragraph', view: 'p' } );\n\t *\n\t *\t\t// Override other converters by specifying a converter definition with a higher priority.\n\t *\t\tconversion.elementToElement( { model: 'paragraph', view: 'div', converterPriority: 'high' } );\n\t *\n\t *\t\t// View specified as an object instead of a string.\n\t *\t\tconversion.elementToElement( {\n\t *\t\t\tmodel: 'fancyParagraph',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'p',\n\t *\t\t\t\tclasses: 'fancy'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to a `paragraph` element.\n\t *\t\tconversion.elementToElement( {\n\t *\t\t\tmodel: 'paragraph',\n\t *\t\t\tview: 'p',\n\t *\t\t\tupcastAlso: [\n\t *\t\t\t\t'div',\n\t *\t\t\t\t{\n\t *\t\t\t\t\t// Any element with the `display: block` style.\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\tdisplay: 'block'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// `upcastAlso` set as callback enables a conversion of a wide range of different view elements.\n\t *\t\tconversion.elementToElement( {\n\t *\t\t\tmodel: 'heading',\n\t *\t\t\tview: 'h2',\n\t *\t\t\t// Convert \"headling-like\" paragraphs to headings.\n\t *\t\t\tupcastAlso: viewElement => {\n\t *\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\tif ( size > 26 ) {\n\t *\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t}\n\t *\n\t *\t\t\t\treturn null;\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * `definition.model` is a `String` with a model element name to convert from or to.\n\t * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.\n\t *\n\t * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.\n\t */\n\telementToElement( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).add( downcastElementToElement( definition ) );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' ).add(\n\t\t\t\tupcastElementToElement( {\n\t\t\t\t\tmodel,\n\t\t\t\t\tview,\n\t\t\t\t\tconverterPriority: definition.converterPriority\n\t\t\t\t} )\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model attribute to a view element (and vice versa).\n\t * For example, a model text node with `\"Foo\"` as data and the `bold` attribute is `<strong>Foo</strong>` in the view.\n\t *\n\t *\t\t// A simple conversion from the `bold=true` attribute to the `<strong>` view element (and vice versa).\n\t *\t\tconversion.attributeToElement( { model: 'bold', view: 'strong' } );\n\t *\n\t *\t\t// Override other converters by specifying a converter definition with a higher priority.\n\t *\t\tconversion.attributeToElement( { model: 'bold', view: 'b', converterPriority: 'high' } );\n\t *\n\t *\t\t// View specified as an object instead of a string.\n\t *\t\tconversion.attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: {\n\t *\t\t\t\tname: 'span',\n\t *\t\t\t\tclasses: 'bold'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `config.model.name` to define the conversion only from a given node type, `$text` in this case.\n\t *\t\t// The same attribute on different elements may then be handled by a different converter.\n\t *\t\tconversion.attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'textDecoration',\n\t *\t\t\t\tvalues: [ 'underline', 'lineThrough' ],\n\t *\t\t\t\tname: '$text'\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tunderline: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-decoration': 'underline'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tlineThrough: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-decoration': 'line-through'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to the `bold` attribute.\n\t *\t\tconversion.attributeToElement( {\n\t *\t\t\tmodel: 'bold',\n\t *\t\t\tview: 'strong',\n\t *\t\t\tupcastAlso: [\n\t *\t\t\t\t'b',\n\t *\t\t\t\t{\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tclasses: 'bold'\n\t *\t\t\t\t},\n\t *\t\t\t\t{\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-weight': 'bold'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tviewElement => {\n\t *\t\t\t\t\tconst fontWeight = viewElement.getStyle( 'font-weight' );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'span' ) && fontWeight && /\\d+/.test() && Number( fontWeight ) > 500 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn {\n\t *\t\t\t\t\t\t\tname: true,\n\t *\t\t\t\t\t\t\tstyles: [ 'font-weight' ]\n\t *\t\t\t\t\t\t};\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Conversion from and to a model attribute key whose value is an enum (`fontSize=big|small`).\n\t *\t\t// `upcastAlso` set as callback enables a conversion of a wide range of different view elements.\n\t *\t\tconversion.attributeToElement( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'fontSize',\n\t *\t\t\t\tvalues: [ 'big', 'small' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tbig: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '1.2em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tsmall: {\n\t *\t\t\t\t\tname: 'span',\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'font-size': '0.8em'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tupcastAlso: {\n\t *\t\t\t\tbig: viewElement => {\n\t *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'span' ) && size > 10 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t},\n\t *\t\t\t\tsmall: viewElement => {\n\t *\t\t\t\t\tconst fontSize = viewElement.getStyle( 'font-size' );\n\t *\n\t *\t\t\t\t\tif ( !fontSize ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst match = fontSize.match( /(\\d+)\\s*px/ );\n\t *\n\t *\t\t\t\t\tif ( !match ) {\n\t *\t\t\t\t\t\treturn null;\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\tconst size = Number( match[ 1 ] );\n\t *\n\t *\t\t\t\t\tif ( viewElement.is( 'span' ) && size < 10 ) {\n\t *\t\t\t\t\t\t// Returned value can be an object with the matched properties.\n\t *\t\t\t\t\t\t// These properties will be \"consumed\" during the conversion.\n\t *\t\t\t\t\t\t// See `engine.view.Matcher~MatcherPattern` and `engine.view.Matcher#match` for more details.\n\t *\n\t *\t\t\t\t\t\treturn { name: true, styles: [ 'font-size' ] };\n\t *\t\t\t\t\t}\n\t *\n\t *\t\t\t\t\treturn null;\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * The `definition.model` parameter specifies which model attribute should be converted from or to. It can be a `{ key, value }` object\n\t * describing the attribute key and value to convert or a `String` specifying just the attribute key (then `value` is set to `true`).\n\t * See {@link module:engine/conversion/conversion~ConverterDefinition} to learn about other parameters.\n\t *\n\t * @param {module:engine/conversion/conversion~ConverterDefinition} definition The converter definition.\n\t */\n\tattributeToElement( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).add( downcastAttributeToElement( definition ) );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' ).add(\n\t\t\t\tupcastElementToAttribute( {\n\t\t\t\t\tview,\n\t\t\t\t\tmodel,\n\t\t\t\t\tpriority: definition.priority\n\t\t\t\t} )\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Sets up converters between the model and the view that convert a model attribute to a view attribute (and vice versa).\n\t * For example, `<image src='foo.jpg'></image>` is converted to `<img src='foo.jpg'></img>` (the same attribute key and value).\n\t *\n\t *\t\t// A simple conversion from the `source` model attribute to the `src` view attribute (and vice versa).\n\t *\t\tconversion.attributeToAttribute( { model: 'source', view: 'src' } );\n\t *\n\t *\t\t// Attribute values are strictly specified.\n\t *\t\tconversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'image',\n\t *\t\t\t\tkey: 'aside',\n\t *\t\t\t\tvalues: [ 'aside' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\taside: {\n\t *\t\t\t\t\tname: 'img',\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: [ 'aside', 'half-size' ]\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Set the style attribute.\n\t *\t\tconversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tname: 'image',\n\t *\t\t\t\tkey: 'aside',\n\t *\t\t\t\tvalues: [ 'aside' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\taside: {\n\t *\t\t\t\t\tname: 'img',\n\t *\t\t\t\t\tkey: 'style',\n\t *\t\t\t\t\tvalue: {\n\t *\t\t\t\t\t\tfloat: 'right',\n\t *\t\t\t\t\t\twidth: '50%',\n\t *\t\t\t\t\t\tmargin: '5px'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Conversion from and to a model attribute key whose value is an enum (`align=right|center`).\n\t *\t\t// Use `upcastAlso` to define other view elements that should also be converted to the `align=right` attribute.\n\t *\t\tconversion.attributeToAttribute( {\n\t *\t\t\tmodel: {\n\t *\t\t\t\tkey: 'align',\n\t *\t\t\t\tvalues: [ 'right', 'center' ]\n\t *\t\t\t},\n\t *\t\t\tview: {\n\t *\t\t\t\tright: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: 'align-right'\n\t *\t\t\t\t},\n\t *\t\t\t\tcenter: {\n\t *\t\t\t\t\tkey: 'class',\n\t *\t\t\t\t\tvalue: 'align-center'\n\t *\t\t\t\t}\n\t *\t\t\t},\n\t *\t\t\tupcastAlso: {\n\t *\t\t\t\tright: {\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-align': 'right'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t},\n\t *\t\t\t\tcenter: {\n\t *\t\t\t\t\tstyles: {\n\t *\t\t\t\t\t\t'text-align': 'center'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * The `definition.model` parameter specifies which model attribute should be converted from and to.\n\t * It can be a `{ key, [ values ], [ name ] }` object or a `String`, which will be treated like `{ key: definition.model }`.\n\t * The `key` property is the model attribute key to convert from and to.\n\t * The `values` are the possible model attribute values. If `values` is not set, the model attribute value will be the same as the\n\t * view attribute value.\n\t * If `name` is set, the conversion will be set up only for model elements with the given name.\n\t *\n\t * The `definition.view` parameter specifies which view attribute should be converted from and to.\n\t * It can be a `{ key, value, [ name ] }` object or a `String`, which will be treated like `{ key: definition.view }`.\n\t * The `key` property is the view attribute key to convert from and to.\n\t * The `value` is the view attribute value to convert from and to. If `definition.value` is not set, the view attribute value will be\n\t * the same as the model attribute value.\n\t * If `key` is `'class'`, `value` can be a `String` or an array of `String`s.\n\t * If `key` is `'style'`, `value` is an object with key-value pairs.\n\t * In other cases, `value` is a `String`.\n\t * If `name` is set, the conversion will be set up only for model elements with the given name.\n\t * If `definition.model.values` is set, `definition.view` is an object that assigns values from `definition.model.values`\n\t * to `{ key, value, [ name ] }` objects.\n\t *\n\t * `definition.upcastAlso` specifies which other matching view elements should also be upcast to the given model configuration.\n\t * If `definition.model.values` is set, `definition.upcastAlso` should be an object assigning values from `definition.model.values`\n\t * to {@link module:engine/view/matcher~MatcherPattern}s or arrays of {@link module:engine/view/matcher~MatcherPattern}s.\n\t *\n\t * **Note:** `definition.model` and `definition.view` form should be mirrored, so the same types of parameters should\n\t * be given in both parameters.\n\t *\n\t * @param {Object} definition The converter definition.\n\t * @param {String|Object} definition.model The model attribute to convert from and to.\n\t * @param {String|Object} definition.view The view attribute to convert from and to.\n\t * @param {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [definition.upcastAlso]\n\t * Any view element matching `definition.upcastAlso` will also be converted to the given model attribute. `definition.upcastAlso`\n\t * is used only if `config.model.values` is specified.\n\t */\n\tattributeToAttribute( definition ) {\n\t\t// Set up downcast converter.\n\t\tthis.for( 'downcast' ).add( downcastAttributeToAttribute( definition ) );\n\n\t\t// Set up upcast converter.\n\t\tfor ( const { model, view } of _getAllUpcastDefinitions( definition ) ) {\n\t\t\tthis.for( 'upcast' ).add(\n\t\t\t\tupcastAttributeToAttribute( {\n\t\t\t\t\tview,\n\t\t\t\t\tmodel\n\t\t\t\t} )\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * Returns dispatchers registered under a given group name.\n\t *\n\t * If the given group name has not been registered, the\n\t * {@link module:utils/ckeditorerror~CKEditorError `conversion-for-unknown-group` error} is thrown.\n\t *\n\t * @private\n\t * @param {String} groupName\n\t * @returns {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n\t * module:engine/conversion/upcastdispatcher~UpcastDispatcher>}\n\t */\n\t_getDispatchers( groupName ) {\n\t\tconst dispatchers = this._dispatchersGroups.get( groupName );\n\n\t\tif ( !dispatchers ) {\n\t\t\t/**\n\t\t\t * Trying to add a converter to an unknown dispatchers group.\n\t\t\t *\n\t\t\t * @error conversion-for-unknown-group\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'conversion-for-unknown-group: Trying to add a converter to an unknown dispatchers group.' );\n\t\t}\n\n\t\treturn dispatchers;\n\t}\n}\n\n/**\n * Defines how the model should be converted from and to the view.\n *\n * @typedef {Object} module:engine/conversion/conversion~ConverterDefinition\n *\n * @property {*} [model] The model conversion definition. Describes the model element or model attribute to convert. This parameter differs\n * for different functions that accept `ConverterDefinition`. See the description of the function to learn how to set it.\n * @property {module:engine/view/elementdefinition~ElementDefinition|Object} view The definition of the view element to convert from and\n * to. If `model` describes multiple values, `view` is an object that assigns these values (`view` object keys) to view element definitions\n * (`view` object values).\n * @property {module:engine/view/matcher~MatcherPattern|Array.<module:engine/view/matcher~MatcherPattern>} [upcastAlso]\n * Any view element matching `upcastAlso` will also be converted to the model. If `model` describes multiple values, `upcastAlso`\n * is an object that assigns these values (`upcastAlso` object keys) to {@link module:engine/view/matcher~MatcherPattern}s\n * (`upcastAlso` object values).\n * @property {module:utils/priorities~PriorityString} [converterPriority] The converter priority.\n */\n\n// Helper function for the `Conversion` `.add()` method.\n//\n// Calls `conversionHelper` on each dispatcher from the group specified earlier in the `.for()` call, effectively\n// adding converters to all specified dispatchers.\n//\n// @private\n// @param {Array.<module:engine/conversion/downcastdispatcher~DowncastDispatcher|\n// module:engine/conversion/upcastdispatcher~UpcastDispatcher>} dispatchers\n// @param {Function} conversionHelper\nfunction _addToDispatchers( dispatchers, conversionHelper ) {\n\tfor ( const dispatcher of dispatchers ) {\n\t\tconversionHelper( dispatcher );\n\t}\n}\n\n// Helper function that creates a joint array out of an item passed in `definition.view` and items passed in\n// `definition.upcastAlso`.\n//\n// @param {module:engine/conversion/conversion~ConverterDefinition} definition\n// @returns {Array} Array containing view definitions.\nfunction* _getAllUpcastDefinitions( definition ) {\n\tif ( definition.model.values ) {\n\t\tfor ( const value of definition.model.values ) {\n\t\t\tconst model = { key: definition.model.key, value };\n\t\t\tconst view = definition.view[ value ];\n\t\t\tconst upcastAlso = definition.upcastAlso ? definition.upcastAlso[ value ] : undefined;\n\n\t\t\tyield* _getUpcastDefinition( model, view, upcastAlso );\n\t\t}\n\t} else {\n\t\tyield* _getUpcastDefinition( definition.model, definition.view, definition.upcastAlso );\n\t}\n}\n\nfunction* _getUpcastDefinition( model, view, upcastAlso ) {\n\tyield { model, view };\n\n\tif ( upcastAlso ) {\n\t\tupcastAlso = Array.isArray( upcastAlso ) ? upcastAlso : [ upcastAlso ];\n\n\t\tfor ( const upcastAlsoItem of upcastAlso ) {\n\t\t\tyield { model, view: upcastAlsoItem };\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/operation\n */\n\nimport clone from '@ckeditor/ckeditor5-utils/src/lib/lodash/clone';\n\n/**\n * Abstract base operation class.\n *\n * @abstract\n */\nexport default class Operation {\n\t/**\n\t * Base operation constructor.\n\t *\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( baseVersion ) {\n\t\t/**\n\t\t * {@link module:engine/model/document~Document#version} on which operation can be applied. If you try to\n\t\t * {@link module:engine/model/model~Model#applyOperation apply} operation with different base version than the\n\t\t * {@link module:engine/model/document~Document#version document version} the\n\t\t * {@link module:utils/ckeditorerror~CKEditorError model-document-applyOperation-wrong-version} error is thrown.\n\t\t *\n\t\t * @member {Number}\n\t\t */\n\t\tthis.baseVersion = baseVersion;\n\n\t\t/**\n\t\t * Defines whether operation is executed on attached or detached {@link module:engine/model/item~Item items}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isDocumentOperation\n\t\t */\n\t\tthis.isDocumentOperation = this.baseVersion !== null;\n\n\t\t/**\n\t\t * Operation type.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} #type\n\t\t */\n\n\t\t/**\n\t\t * {@link module:engine/model/delta/delta~Delta Delta} which the operation is a part of. This property is set by the\n\t\t * {@link module:engine/model/delta/delta~Delta delta} when the operations is added to it by the\n\t\t * {@link module:engine/model/delta/delta~Delta#addOperation} method.\n\t\t *\n\t\t * @member {module:engine/model/delta/delta~Delta} #delta\n\t\t */\n\n\t\t/**\n\t\t * Creates and returns an operation that has the same parameters as this operation.\n\t\t *\n\t\t * @method #clone\n\t\t * @returns {module:engine/model/operation/operation~Operation} Clone of this operation.\n\t\t */\n\n\t\t/**\n\t\t * Creates and returns a reverse operation. Reverse operation when executed right after\n\t\t * the original operation will bring back tree model state to the point before the original\n\t\t * operation execution. In other words, it reverses changes done by the original operation.\n\t\t *\n\t\t * Keep in mind that tree model state may change since executing the original operation,\n\t\t * so reverse operation will be \"outdated\". In that case you will need to\n\t\t * {@link module:engine/model/operation/transform~transform} it by all operations that were executed after the original operation.\n\t\t *\n\t\t * @method #getReversed\n\t\t * @returns {module:engine/model/operation/operation~Operation} Reversed operation.\n\t\t */\n\n\t\t/**\n\t\t * Executes the operation - modifications described by the operation properties will be applied to the model tree.\n\t\t *\n\t\t * @protected\n\t\t * @method #_execute\n\t\t */\n\t}\n\n\t/**\n\t * Checks whether the operation's parameters are correct and the operation can be correctly executed. Throws\n\t * an error if operation is not valid.\n\t *\n\t * @protected\n\t * @method #_validate\n\t */\n\t_validate() {\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @method #toJSON\n\t * @returns {Object} Clone of this object with the delta property replaced with string.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this, true );\n\n\t\tjson.__className = this.constructor.className;\n\n\t\t// Remove parent delta to avoid circular dependencies.\n\t\tdelete json.delta;\n\n\t\t// Only document operations are shared with other clients so it is not necessary to keep this information.\n\t\tdelete json.isDocumentOperation;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Name of the operation class used for serialization.\n\t *\n\t * @type {String}\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.Operation';\n\t}\n\n\t/**\n\t * Creates Operation object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} doc Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/operation~Operation}\n\t */\n\tstatic fromJSON( json ) {\n\t\treturn new this( json.baseVersion );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module module:engine/model/documentfragment\n */\n\nimport NodeList from './nodelist';\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\n/**\n * DocumentFragment represents a part of model which does not have a common root but it's top-level nodes\n * can be seen as siblings. In other words, it is a detached part of model tree, without a root.\n *\n * DocumentFragment has own {@link module:engine/model/markercollection~MarkerCollection}. Markers from this collection\n * will be set to the {@link module:engine/model/model~Model#markers model markers} by a\n * {@link module:engine/model/writer~Writer#insert} function.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates an empty `DocumentFragment`.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/model/writer~Writer#createDocumentFragment} method instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/node~Node|Iterable.<module:engine/model/node~Node>} [children]\n\t * Nodes to be contained inside the `DocumentFragment`.\n\t */\n\tconstructor( children ) {\n\t\t/**\n\t\t * DocumentFragment static markers map. This is a list of names and {@link module:engine/model/range~Range ranges}\n\t\t * which will be set as Markers to {@link module:engine/model/model~Model#markers model markers collection}\n\t\t * when DocumentFragment will be inserted to the document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Map<String,module:engine/model/range~Range>} module:engine/model/documentfragment~DocumentFragment#markers\n\t\t */\n\t\tthis.markers = new Map();\n\n\t\t/**\n\t\t * List of nodes contained inside the document fragment.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = new NodeList();\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all nodes contained inside this document fragment.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this.getChildren();\n\t}\n\n\t/**\n\t * Number of this document fragment's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Sum of {module:engine/model/node~Node#offsetSize offset sizes} of all of this document fragment's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget maxOffset() {\n\t\treturn this._children.maxOffset;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether given model tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/model/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'documentFragment';\n\t}\n\n\t/**\n\t * Gets the child at the given index. Returns `null` if incorrect index was passed.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/model/node~Node|null} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children.getNode( index );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all of this document fragment's children.\n\t *\n\t * @returns {Iterable.<module:engine/model/node~Node>}\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an index of the given child node. Returns `null` if given node is not a child of this document fragment.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's index.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.getNodeIndex( node );\n\t}\n\n\t/**\n\t * Returns the starting offset of given child. Starting offset is equal to the sum of\n\t * {module:engine/model/node~Node#offsetSize offset sizes} of all node's siblings that are before it. Returns `null` if\n\t * given node is not a child of this document fragment.\n\t *\n\t * @param {module:engine/model/node~Node} node Child node to look for.\n\t * @returns {Number|null} Child node's starting offset.\n\t */\n\tgetChildStartOffset( node ) {\n\t\treturn this._children.getNodeStartOffset( node );\n\t}\n\n\t/**\n\t * Returns path to a `DocumentFragment`, which is an empty array. Added for compatibility reasons.\n\t *\n\t * @returns {Array}\n\t */\n\tgetPath() {\n\t\treturn [];\n\t}\n\n\t/**\n\t * Returns a descendant node by its path relative to this element.\n\t *\n\t *\t\t// <this>a<b>c</b></this>\n\t *\t\tthis.getNodeByPath( [ 0 ] );     // -> \"a\"\n\t *\t\tthis.getNodeByPath( [ 1 ] );     // -> <b>\n\t *\t\tthis.getNodeByPath( [ 1, 0 ] );  // -> \"c\"\n\t *\n\t * @param {Array.<Number>} relativePath Path of the node to find, relative to this element.\n\t * @returns {module:engine/model/node~Node|module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tgetNodeByPath( relativePath ) {\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\tfor ( const index of relativePath ) {\n\t\t\tnode = node.getChild( node.offsetToIndex( index ) );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Converts offset \"position\" to index \"position\".\n\t *\n\t * Returns index of a node that occupies given offset. If given offset is too low, returns `0`. If given offset is\n\t * too high, returns index after last child}.\n\t *\n\t *\t\tconst textNode = new Text( 'foo' );\n\t *\t\tconst pElement = new Element( 'p' );\n\t *\t\tconst docFrag = new DocumentFragment( [ textNode, pElement ] );\n\t *\t\tdocFrag.offsetToIndex( -1 ); // Returns 0, because offset is too low.\n\t *\t\tdocFrag.offsetToIndex( 0 ); // Returns 0, because offset 0 is taken by `textNode` which is at index 0.\n\t *\t\tdocFrag.offsetToIndex( 1 ); // Returns 0, because `textNode` has `offsetSize` equal to 3, so it occupies offset 1 too.\n\t *\t\tdocFrag.offsetToIndex( 2 ); // Returns 0.\n\t *\t\tdocFrag.offsetToIndex( 3 ); // Returns 1.\n\t *\t\tdocFrag.offsetToIndex( 4 ); // Returns 2. There are no nodes at offset 4, so last available index is returned.\n\t *\n\t * @param {Number} offset Offset to look for.\n\t * @returns {Number} Index of a node that occupies given offset.\n\t */\n\toffsetToIndex( offset ) {\n\t\treturn this._children.offsetToIndex( offset );\n\t}\n\n\t/**\n\t * Converts `DocumentFragment` instance to plain object and returns it.\n\t * Takes care of converting all of this document fragment's children.\n\t *\n\t * @returns {Object} `DocumentFragment` instance converted to plain object.\n\t */\n\ttoJSON() {\n\t\tconst json = [];\n\n\t\tfor ( const node of this._children ) {\n\t\t\tjson.push( node.toJSON() );\n\t\t}\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Creates a `DocumentFragment` instance from given plain object (i.e. parsed JSON string).\n\t * Converts `DocumentFragment` children to proper nodes.\n\t *\n\t * @param {Object} json Plain object to be converted to `DocumentFragment`.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} `DocumentFragment` instance created using given plain object.\n\t */\n\tstatic fromJSON( json ) {\n\t\tconst children = [];\n\n\t\tfor ( const child of json ) {\n\t\t\tif ( child.name ) {\n\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t} else {\n\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t}\n\t\t}\n\n\t\treturn new DocumentFragment( children );\n\t}\n\n\t/**\n\t * {@link #_insertChild Inserts} one or more nodes at the end of this document fragment.\n\t *\n\t * @protected\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_appendChild( items ) {\n\t\tthis._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts one or more nodes at the given index and sets {@link module:engine/model/node~Node#parent parent} of these nodes\n\t * to this document fragment.\n\t *\n\t * @protected\n\t * @param {Number} index Index at which nodes should be inserted.\n\t * @param {module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>} items Items to be inserted.\n\t */\n\t_insertChild( index, items ) {\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\t\t}\n\n\t\tthis._children._insertNodes( index, nodes );\n\t}\n\n\t/**\n\t * Removes one or more nodes starting at the given index\n\t * and sets {@link module:engine/model/node~Node#parent parent} of these nodes to `null`.\n\t *\n\t * @protected\n\t * @param {Number} index Index of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/model/node~Node>} Array containing removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tconst nodes = this._children._removeNodes( index, howMany );\n\n\t\tfor ( const node of nodes ) {\n\t\t\tnode.parent = null;\n\t\t}\n\n\t\treturn nodes;\n\t}\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/model/item~Item|Iterable.<module:engine/model/item~Item>}\n// @returns {Iterable.<module:engine/model/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data, node.getAttributes() );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/utils\n */\n\nimport Node from '../node';\nimport Text from '../text';\nimport TextProxy from '../textproxy';\nimport Range from '../range';\nimport DocumentFragment from '../documentfragment';\nimport NodeList from '../nodelist';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Contains functions used for composing model tree by {@link module:engine/model/operation/operation~Operation operations}.\n * Those functions are built on top of {@link module:engine/model/node~Node node}, and it's child classes', APIs.\n *\n * @protected\n * @namespace utils\n */\n\n/**\n * Inserts given nodes at given position.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.insert\n * @param {module:engine/model/position~Position} position Position at which nodes should be inserted.\n * @param {module:engine/model/node~NodeSet} nodes Nodes to insert.\n * @returns {module:engine/model/range~Range} Range spanning over inserted elements.\n */\nexport function _insert( position, nodes ) {\n\tnodes = _normalizeNodes( nodes );\n\n\t// We have to count offset before inserting nodes because they can get merged and we would get wrong offsets.\n\tconst offset = nodes.reduce( ( sum, node ) => sum + node.offsetSize, 0 );\n\tconst parent = position.parent;\n\n\t// Insertion might be in a text node, we should split it if that's the case.\n\t_splitNodeAtPosition( position );\n\tconst index = position.index;\n\n\t// Insert nodes at given index. After splitting we have a proper index and insertion is between nodes,\n\t// using basic `Element` API.\n\tparent._insertChild( index, nodes );\n\n\t// Merge text nodes, if possible. Merging is needed only at points where inserted nodes \"touch\" \"old\" nodes.\n\t_mergeNodesAtIndex( parent, index + nodes.length );\n\t_mergeNodesAtIndex( parent, index );\n\n\treturn new Range( position, position.getShiftedBy( offset ) );\n}\n\n/**\n * Removed nodes in given range. Only {@link module:engine/model/range~Range#isFlat flat} ranges are accepted.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils._remove\n * @param {module:engine/model/range~Range} range Range containing nodes to remove.\n * @returns {Array.<module:engine/model/node~Node>}\n */\nexport function _remove( range ) {\n\tif ( !range.isFlat ) {\n\t\t/**\n\t\t * Trying to remove a range which starts and ends in different element.\n\t\t *\n\t\t * @error operation-utils-remove-range-not-flat\n\t\t */\n\t\tthrow new CKEditorError( 'operation-utils-remove-range-not-flat: ' +\n\t\t\t'Trying to remove a range which starts and ends in different element.' );\n\t}\n\n\tconst parent = range.start.parent;\n\n\t// Range may be inside text nodes, we have to split them if that's the case.\n\t_splitNodeAtPosition( range.start );\n\t_splitNodeAtPosition( range.end );\n\n\t// Remove the text nodes using basic `Element` API.\n\tconst removed = parent._removeChildren( range.start.index, range.end.index - range.start.index );\n\n\t// Merge text nodes, if possible. After some nodes were removed, node before and after removed range will be\n\t// touching at the position equal to the removed range beginning. We check merging possibility there.\n\t_mergeNodesAtIndex( parent, range.start.index );\n\n\treturn removed;\n}\n\n/**\n * Moves nodes in given range to given target position. Only {@link module:engine/model/range~Range#isFlat flat} ranges are accepted.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.move\n * @param {module:engine/model/range~Range} sourceRange Range containing nodes to move.\n * @param {module:engine/model/position~Position} targetPosition Position to which nodes should be moved.\n * @returns {module:engine/model/range~Range} Range containing moved nodes.\n */\nexport function _move( sourceRange, targetPosition ) {\n\tif ( !sourceRange.isFlat ) {\n\t\t/**\n\t\t * Trying to move a range which starts and ends in different element.\n\t\t *\n\t\t * @error operation-utils-move-range-not-flat\n\t\t */\n\t\tthrow new CKEditorError( 'operation-utils-move-range-not-flat: ' +\n\t\t\t'Trying to move a range which starts and ends in different element.' );\n\t}\n\n\tconst nodes = _remove( sourceRange );\n\n\t// We have to fix `targetPosition` because model changed after nodes from `sourceRange` got removed and\n\t// that change might have an impact on `targetPosition`.\n\ttargetPosition = targetPosition._getTransformedByDeletion( sourceRange.start, sourceRange.end.offset - sourceRange.start.offset );\n\n\treturn _insert( targetPosition, nodes );\n}\n\n/**\n * Sets given attribute on nodes in given range.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils._setAttribute\n * @param {module:engine/model/range~Range} range Range containing nodes that should have the attribute set.\n * @param {String} key Key of attribute to set.\n * @param {*} value Attribute value.\n */\nexport function _setAttribute( range, key, value ) {\n\t// Range might start or end in text nodes, so we have to split them.\n\t_splitNodeAtPosition( range.start );\n\t_splitNodeAtPosition( range.end );\n\n\t// Iterate over all items in the range.\n\tfor ( const item of range.getItems() ) {\n\t\t// Iterator will return `TextProxy` instances but we know that those text proxies will\n\t\t// always represent full text nodes (this is guaranteed thanks to splitting we did before).\n\t\t// So, we can operate on those text proxies' text nodes.\n\t\tconst node = item.is( 'textProxy' ) ? item.textNode : item;\n\n\t\tif ( value !== null ) {\n\t\t\tnode._setAttribute( key, value );\n\t\t} else {\n\t\t\tnode._removeAttribute( key );\n\t\t}\n\n\t\t// After attributes changing it may happen that some text nodes can be merged. Try to merge with previous node.\n\t\t_mergeNodesAtIndex( node.parent, node.index );\n\t}\n\n\t// Try to merge last changed node with it's previous sibling (not covered by the loop above).\n\t_mergeNodesAtIndex( range.end.parent, range.end.index );\n}\n\n/**\n * Normalizes given object or an array of objects to an array of {@link module:engine/model/node~Node nodes}. See\n * {@link module:engine/model/node~NodeSet NodeSet} for details on how normalization is performed.\n *\n * @protected\n * @function module:engine/model/operation/utils~utils.normalizeNodes\n * @param {module:engine/model/node~NodeSet} nodes Objects to normalize.\n * @returns {Array.<module:engine/model/node~Node>} Normalized nodes.\n */\nexport function _normalizeNodes( nodes ) {\n\tconst normalized = [];\n\n\tif ( !( nodes instanceof Array ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Convert instances of classes other than Node.\n\tfor ( let i = 0; i < nodes.length; i++ ) {\n\t\tif ( typeof nodes[ i ] == 'string' ) {\n\t\t\tnormalized.push( new Text( nodes[ i ] ) );\n\t\t} else if ( nodes[ i ] instanceof TextProxy ) {\n\t\t\tnormalized.push( new Text( nodes[ i ].data, nodes[ i ].getAttributes() ) );\n\t\t} else if ( nodes[ i ] instanceof DocumentFragment || nodes[ i ] instanceof NodeList ) {\n\t\t\tfor ( const child of nodes[ i ] ) {\n\t\t\t\tnormalized.push( child );\n\t\t\t}\n\t\t} else if ( nodes[ i ] instanceof Node ) {\n\t\t\tnormalized.push( nodes[ i ] );\n\t\t}\n\t\t// Skip unrecognized type.\n\t}\n\n\t// Merge text nodes.\n\tfor ( let i = 1; i < normalized.length; i++ ) {\n\t\tconst node = normalized[ i ];\n\t\tconst prev = normalized[ i - 1 ];\n\n\t\tif ( node instanceof Text && prev instanceof Text && _haveSameAttributes( node, prev ) ) {\n\t\t\t// Doing this instead changing prev.data because .data is readonly.\n\t\t\tnormalized.splice( i - 1, 2, new Text( prev.data + node.data, prev.getAttributes() ) );\n\t\t\ti--;\n\t\t}\n\t}\n\n\treturn normalized;\n}\n\n/**\n * Checks if nodes before and after given index in given element are {@link module:engine/model/text~Text text nodes} and\n * merges them into one node if they have same attributes.\n *\n * Merging is done by removing two text nodes and inserting a new text node containing data from both merged text nodes.\n *\n * @ignore\n * @private\n * @param {module:engine/model/element~Element} element Parent element of nodes to merge.\n * @param {Number} index Index between nodes to merge.\n */\nfunction _mergeNodesAtIndex( element, index ) {\n\tconst nodeBefore = element.getChild( index - 1 );\n\tconst nodeAfter = element.getChild( index );\n\n\t// Check if both of those nodes are text objects with same attributes.\n\tif ( nodeBefore && nodeAfter && nodeBefore.is( 'text' ) && nodeAfter.is( 'text' ) && _haveSameAttributes( nodeBefore, nodeAfter ) ) {\n\t\t// Append text of text node after index to the before one.\n\t\tconst mergedNode = new Text( nodeBefore.data + nodeAfter.data, nodeBefore.getAttributes() );\n\n\t\t// Remove separate text nodes.\n\t\telement._removeChildren( index - 1, 2 );\n\n\t\t// Insert merged text node.\n\t\telement._insertChild( index - 1, mergedNode );\n\t}\n}\n\n/**\n * Checks if given position is in a text node, and if so, splits the text node in two text nodes, each of them\n * containing a part of original text node.\n *\n * @ignore\n * @private\n * @param {module:engine/model/position~Position} position Position at which node should be split.\n */\nfunction _splitNodeAtPosition( position ) {\n\tconst textNode = position.textNode;\n\tconst element = position.parent;\n\n\tif ( textNode ) {\n\t\tconst offsetDiff = position.offset - textNode.startOffset;\n\t\tconst index = textNode.index;\n\n\t\telement._removeChildren( index, 1 );\n\n\t\tconst firstPart = new Text( textNode.data.substr( 0, offsetDiff ), textNode.getAttributes() );\n\t\tconst secondPart = new Text( textNode.data.substr( offsetDiff ), textNode.getAttributes() );\n\n\t\telement._insertChild( index, [ firstPart, secondPart ] );\n\t}\n}\n\n/**\n * Checks whether two given nodes have same attributes.\n *\n * @ignore\n * @private\n * @param {module:engine/model/node~Node} nodeA Node to check.\n * @param {module:engine/model/node~Node} nodeB Node to check.\n * @returns {Boolean} `true` if nodes have same attributes, `false` otherwise.\n */\nfunction _haveSameAttributes( nodeA, nodeB ) {\n\tconst iteratorA = nodeA.getAttributes();\n\tconst iteratorB = nodeB.getAttributes();\n\n\tfor ( const attr of iteratorA ) {\n\t\tif ( attr[ 1 ] !== nodeB.getAttribute( attr[ 0 ] ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\titeratorB.next();\n\t}\n\n\treturn iteratorB.next().done;\n}\n\n/**\n * Value that can be normalized to an array of {@link module:engine/model/node~Node nodes}.\n *\n * Non-arrays are normalized as follows:\n * * {@link module:engine/model/node~Node Node} is left as is,\n * * {@link module:engine/model/textproxy~TextProxy TextProxy} and `String` are normalized to {@link module:engine/model/text~Text Text},\n * * {@link module:engine/model/nodelist~NodeList NodeList} is normalized to an array containing all nodes that are in that node list,\n * * {@link module:engine/model/documentfragment~DocumentFragment DocumentFragment} is normalized to an array containing all of it's\n * * children.\n *\n * Arrays are processed item by item like non-array values and flattened to one array. Normalization always results in\n * a flat array of {@link module:engine/model/node~Node nodes}. Consecutive text nodes (or items normalized to text nodes) will be\n * merged if they have same attributes.\n *\n * @typedef {module:engine/model/node~Node|module:engine/model/textproxy~TextProxy|String|\n * module:engine/model/nodelist~NodeList|module:engine/model/documentfragment~DocumentFragment|Iterable}\n * module:engine/model/node~NodeSet\n */\n","import baseIsEqual from './_baseIsEqual';\n\n/**\n * Performs a deep comparison between two values to determine if they are\n * equivalent.\n *\n * **Note:** This method supports comparing arrays, array buffers, booleans,\n * date objects, error objects, maps, numbers, `Object` objects, regexes,\n * sets, strings, symbols, and typed arrays. `Object` objects are compared\n * by their own, not inherited, enumerable properties. Functions and DOM\n * nodes are **not** supported.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Lang\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {boolean} Returns `true` if the values are equivalent,\n *  else `false`.\n * @example\n *\n * var object = { 'user': 'fred' };\n * var other = { 'user': 'fred' };\n *\n * _.isEqual(object, other);\n * // => true\n *\n * object === other;\n * // => false\n */\nfunction isEqual(value, other) {\n  return baseIsEqual(value, other);\n}\n\nexport default isEqual;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/attributeoperation\n */\n\nimport Operation from './operation';\nimport Range from '../range';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport { _setAttribute } from './utils';\nimport isEqual from '@ckeditor/ckeditor5-utils/src/lib/lodash/isEqual';\n\n/**\n * Operation to change nodes' attribute.\n *\n * Using this class you can add, remove or change value of the attribute.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class AttributeOperation extends Operation {\n\t/**\n\t * Creates an operation that changes, removes or adds attributes.\n\t *\n\t * If only `newValue` is set, attribute will be added on a node. Note that all nodes in operation's range must not\n\t * have an attribute with the same key as the added attribute.\n\t *\n\t * If only `oldValue` is set, then attribute with given key will be removed. Note that all nodes in operation's range\n\t * must have an attribute with that key added.\n\t *\n\t * If both `newValue` and `oldValue` are set, then the operation will change the attribute value. Note that all nodes in\n\t * operation's ranges must already have an attribute with given key and `oldValue` as value\n\t *\n\t * @param {module:engine/model/range~Range} range Range on which the operation should be applied.\n\t * @param {String} key Key of an attribute to change or remove.\n\t * @param {*} oldValue Old value of the attribute with given key or `null`, if attribute was not set before.\n\t * @param {*} newValue New value of the attribute with given key or `null`, if operation should remove attribute.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( range, key, oldValue, newValue, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Range on which operation should be applied.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.range = Range.createFromRange( range );\n\n\t\t/**\n\t\t * Key of an attribute to change or remove.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.key = key;\n\n\t\t/**\n\t\t * Old value of the attribute with given key or `null`, if attribute was not set before.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.oldValue = oldValue === undefined ? null : oldValue;\n\n\t\t/**\n\t\t * New value of the attribute with given key or `null`, if operation should remove attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.newValue = newValue === undefined ? null : newValue;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\tif ( this.oldValue === null ) {\n\t\t\treturn 'addAttribute';\n\t\t} else if ( this.newValue === null ) {\n\t\t\treturn 'removeAttribute';\n\t\t} else {\n\t\t\treturn 'changeAttribute';\n\t\t}\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new AttributeOperation( this.range, this.key, this.oldValue, this.newValue, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tgetReversed() {\n\t\treturn new AttributeOperation( this.range, this.key, this.newValue, this.oldValue, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tfor ( const item of this.range.getItems() ) {\n\t\t\tif ( this.oldValue !== null && !isEqual( item.getAttribute( this.key ), this.oldValue ) ) {\n\t\t\t\t/**\n\t\t\t\t * Changed node has different attribute value than operation's old attribute value.\n\t\t\t\t *\n\t\t\t\t * @error attribute-operation-wrong-old-value\n\t\t\t\t * @param {module:engine/model/item~Item} item\n\t\t\t\t * @param {String} key\n\t\t\t\t * @param {*} value\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'attribute-operation-wrong-old-value: Changed node has different attribute value than operation\\'s ' +\n\t\t\t\t\t'old attribute value.',\n\t\t\t\t\t{ item, key: this.key, value: this.oldValue }\n\t\t\t\t);\n\t\t\t}\n\n\t\t\tif ( this.oldValue === null && this.newValue !== null && item.hasAttribute( this.key ) ) {\n\t\t\t\t/**\n\t\t\t\t * The attribute with given key already exists for the given node.\n\t\t\t\t *\n\t\t\t\t * @error attribute-operation-attribute-exists\n\t\t\t\t * @param {module:engine/model/node~Node} node\n\t\t\t\t * @param {String} key\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'attribute-operation-attribute-exists: The attribute with given key already exists.',\n\t\t\t\t\t{ node: item, key: this.key }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t// If value to set is same as old value, don't do anything.\n\t\tif ( !isEqual( this.oldValue, this.newValue ) ) {\n\t\t\t// Execution.\n\t\t\t_setAttribute( this.range, this.key, this.newValue );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.AttributeOperation';\n\t}\n\n\t/**\n\t * Creates `AttributeOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new AttributeOperation( Range.fromJSON( json.range, document ), json.key, json.oldValue, json.newValue, json.baseVersion );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/moveoperation\n */\n\nimport Operation from './operation';\nimport Position from '../position';\nimport Range from '../range';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport { _move } from './utils';\n\n/**\n * Operation to move a range of {@link module:engine/model/item~Item model items}\n * to given {@link module:engine/model/position~Position target position}.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class MoveOperation extends Operation {\n\t/**\n\t * Creates a move operation.\n\t *\n\t * @param {module:engine/model/position~Position} sourcePosition\n\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t * @param {Number} howMany Offset size of moved range. Moved range will start from `sourcePosition` and end at\n\t * `sourcePosition` with offset shifted by `howMany`.\n\t * @param {module:engine/model/position~Position} targetPosition Position at which moved nodes will be inserted.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( sourcePosition, howMany, targetPosition, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/moveoperation~MoveOperation#sourcePosition\n\t\t */\n\t\tthis.sourcePosition = Position.createFromPosition( sourcePosition );\n\n\t\t/**\n\t\t * Offset size of moved range.\n\t\t *\n\t\t * @member {Number} module:engine/model/operation/moveoperation~MoveOperation#howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\n\t\t/**\n\t\t * Position at which moved nodes will be inserted.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/moveoperation~MoveOperation#targetPosition\n\t\t */\n\t\tthis.targetPosition = Position.createFromPosition( targetPosition );\n\n\t\t/**\n\t\t * Defines whether `MoveOperation` is sticky. If `MoveOperation` is sticky, during\n\t\t * {@link module:engine/model/operation/transform~transform operational transformation} if there will be an operation that\n\t\t * inserts some nodes at the position equal to the boundary of this `MoveOperation`, that operation will\n\t\t * get their insertion path updated to the position where this `MoveOperation` moves the range.\n\t\t *\n\t\t * @member {Boolean} module:engine/model/operation/moveoperation~MoveOperation#isSticky\n\t\t */\n\t\tthis.isSticky = false;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'move';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\tconst op = new this.constructor( this.sourcePosition, this.howMany, this.targetPosition, this.baseVersion );\n\t\top.isSticky = this.isSticky;\n\n\t\treturn op;\n\t}\n\n\t/**\n\t * Returns the start position of the moved range after it got moved. This may be different than\n\t * {@link module:engine/model/operation/moveoperation~MoveOperation#targetPosition} in some cases, i.e. when a range is moved\n\t * inside the same parent but {@link module:engine/model/operation/moveoperation~MoveOperation#targetPosition targetPosition}\n\t * is after {@link module:engine/model/operation/moveoperation~MoveOperation#sourcePosition sourcePosition}.\n\t *\n\t *\t\t vv              vv\n\t *\t\tabcdefg ===> adefbcg\n\t *\t\t     ^          ^\n\t *\t\t     targetPos\tmovedRangeStart\n\t *\t\t     offset 6\toffset 4\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetMovedRangeStart() {\n\t\treturn this.targetPosition._getTransformedByDeletion( this.sourcePosition, this.howMany );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation}\n\t */\n\tgetReversed() {\n\t\tconst newTargetPosition = this.sourcePosition._getTransformedByInsertion( this.targetPosition, this.howMany );\n\n\t\tconst op = new this.constructor( this.getMovedRangeStart(), this.howMany, newTargetPosition, this.baseVersion + 1 );\n\t\top.isSticky = this.isSticky;\n\n\t\treturn op;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst sourceElement = this.sourcePosition.parent;\n\t\tconst targetElement = this.targetPosition.parent;\n\t\tconst sourceOffset = this.sourcePosition.offset;\n\t\tconst targetOffset = this.targetPosition.offset;\n\n\t\t// Validate whether move operation has correct parameters.\n\t\t// Validation is pretty complex but move operation is one of the core ways to manipulate the document state.\n\t\t// We expect that many errors might be connected with one of scenarios described below.\n\t\tif ( !sourceElement || !targetElement ) {\n\t\t\t/**\n\t\t\t * Source position or target position is invalid.\n\t\t\t *\n\t\t\t * @error move-operation-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'move-operation-position-invalid: Source position or target position is invalid.'\n\t\t\t);\n\t\t} else if ( sourceOffset + this.howMany > sourceElement.maxOffset ) {\n\t\t\t/**\n\t\t\t * The nodes which should be moved do not exist.\n\t\t\t *\n\t\t\t * @error move-operation-nodes-do-not-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'move-operation-nodes-do-not-exist: The nodes which should be moved do not exist.'\n\t\t\t);\n\t\t} else if ( sourceElement === targetElement && sourceOffset < targetOffset && targetOffset < sourceOffset + this.howMany ) {\n\t\t\t/**\n\t\t\t * Trying to move a range of nodes into the middle of that range.\n\t\t\t *\n\t\t\t * @error move-operation-range-into-itself\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'move-operation-range-into-itself: Trying to move a range of nodes to the inside of that range.'\n\t\t\t);\n\t\t} else if ( this.sourcePosition.root == this.targetPosition.root ) {\n\t\t\tif ( compareArrays( this.sourcePosition.getParentPath(), this.targetPosition.getParentPath() ) == 'prefix' ) {\n\t\t\t\tconst i = this.sourcePosition.path.length - 1;\n\n\t\t\t\tif ( this.targetPosition.path[ i ] >= sourceOffset && this.targetPosition.path[ i ] < sourceOffset + this.howMany ) {\n\t\t\t\t\t/**\n\t\t\t\t\t * Trying to move a range of nodes into one of nodes from that range.\n\t\t\t\t\t *\n\t\t\t\t\t * @error move-operation-node-into-itself\n\t\t\t\t\t */\n\t\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t\t'move-operation-node-into-itself: Trying to move a range of nodes into one of nodes from that range.'\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t_move( Range.createFromPositionAndShift( this.sourcePosition, this.howMany ), this.targetPosition );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.MoveOperation';\n\t}\n\n\t/**\n\t * Creates `MoveOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/moveoperation~MoveOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst sourcePosition = Position.fromJSON( json.sourcePosition, document );\n\t\tconst targetPosition = Position.fromJSON( json.targetPosition, document );\n\n\t\tconst move = new this( sourcePosition, json.howMany, targetPosition, json.baseVersion );\n\n\t\tif ( json.isSticky ) {\n\t\t\tmove.isSticky = true;\n\t\t}\n\n\t\treturn move;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/reinsertoperation\n */\n\nimport MoveOperation from './moveoperation';\nimport RemoveOperation from './removeoperation';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to reinsert previously removed nodes back to the non-graveyard root. This operation acts like\n * {@link module:engine/model/operation/moveoperation~MoveOperation} but it returns\n * {@link module:engine/model/operation/removeoperation~RemoveOperation} when reversed\n * and fires different change event.\n */\nexport default class ReinsertOperation extends MoveOperation {\n\t/**\n\t * Position where nodes will be re-inserted.\n\t *\n\t * @type {module:engine/model/position~Position}\n\t */\n\tget position() {\n\t\treturn this.targetPosition;\n\t}\n\n\t/**\n\t * @param {module:engine/model/position~Position} pos\n\t */\n\tset position( pos ) {\n\t\tthis.targetPosition = pos;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'reinsert';\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/removeoperation~RemoveOperation}\n\t */\n\tgetReversed() {\n\t\tconst newTargetPosition = this.sourcePosition._getTransformedByInsertion( this.targetPosition, this.howMany );\n\n\t\treturn new RemoveOperation( this.getMovedRangeStart(), this.howMany, newTargetPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tsuper._validate();\n\n\t\tif ( !this.sourcePosition.root.document ) {\n\t\t\tthrow new CKEditorError( 'reinsert-operation-on-detached-item: Cannot reinsert detached item.' );\n\t\t}\n\n\t\tif ( !this.targetPosition.root.document ) {\n\t\t\tthrow new CKEditorError( 'reinsert-operation-to-detached-parent: Cannot reinsert item to detached parent.' );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.ReinsertOperation';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/removeoperation\n */\n\nimport MoveOperation from './moveoperation';\nimport ReinsertOperation from './reinsertoperation';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to remove a range of nodes.\n */\nexport default class RemoveOperation extends MoveOperation {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'remove';\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/reinsertoperation~ReinsertOperation|module:engine/model/operation/nooperation~NoOperation}\n\t */\n\tgetReversed() {\n\t\tconst newTargetPosition = this.sourcePosition._getTransformedByInsertion( this.targetPosition, this.howMany );\n\n\t\treturn new ReinsertOperation( this.getMovedRangeStart(), this.howMany, newTargetPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tsuper._validate();\n\n\t\tif ( !this.sourcePosition.root.document ) {\n\t\t\t/**\n\t\t\t * Item that is going to be removed needs to be a {@link module:engine/model/document~Document document} child.\n\t\t\t * To remove Item from detached document fragment use\n\t\t\t * {@link module:engine/model/operation/detachoperation~DetachOperation DetachOperation}.\n\t\t\t *\n\t\t\t * @error remove-operation-on-detached-item\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'remove-operation-on-detached-item: Cannot remove detached item.' );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.RemoveOperation';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/insertoperation\n */\n\nimport Operation from './operation';\nimport Position from '../position';\nimport NodeList from '../nodelist';\nimport RemoveOperation from './removeoperation';\nimport { _insert, _normalizeNodes } from './utils';\nimport Text from '../text';\nimport Element from '../element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to insert one or more nodes at given position in the model.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class InsertOperation extends Operation {\n\t/**\n\t * Creates an insert operation.\n\t *\n\t * @param {module:engine/model/position~Position} position Position of insertion.\n\t * @param {module:engine/model/node~NodeSet} nodes The list of nodes to be inserted.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( position, nodes, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position of insertion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/insertoperation~InsertOperation#position\n\t\t */\n\t\tthis.position = Position.createFromPosition( position );\n\n\t\t/**\n\t\t * List of nodes to insert.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/nodelist~NodeList} module:engine/model/operation/insertoperation~InsertOperation#nodeList\n\t\t */\n\t\tthis.nodes = new NodeList( _normalizeNodes( nodes ) );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'insert';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/insertoperation~InsertOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\tconst nodes = new NodeList( [ ...this.nodes ].map( node => node._clone( true ) ) );\n\n\t\treturn new InsertOperation( this.position, nodes, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/removeoperation~RemoveOperation}\n\t */\n\tgetReversed() {\n\t\tconst graveyard = this.position.root.document.graveyard;\n\t\tconst gyPosition = new Position( graveyard, [ 0 ] );\n\n\t\treturn new RemoveOperation( this.position, this.nodes.maxOffset, gyPosition, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst targetElement = this.position.parent;\n\n\t\tif ( !targetElement || targetElement.maxOffset < this.position.offset ) {\n\t\t\t/**\n\t\t\t * Insertion position is invalid.\n\t\t\t *\n\t\t\t * @error insert-operation-position-invalid\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'insert-operation-position-invalid: Insertion position is invalid.'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t// What happens here is that we want original nodes be passed to writer because we want original nodes\n\t\t// to be inserted to the model. But in InsertOperation, we want to keep those nodes as they were added\n\t\t// to the operation, not modified. For example, text nodes can get merged or cropped while Elements can\n\t\t// get children. It is important that InsertOperation has the copy of original nodes in intact state.\n\t\tconst originalNodes = this.nodes;\n\t\tthis.nodes = new NodeList( [ ...originalNodes ].map( node => node._clone( true ) ) );\n\n\t\t_insert( this.position, originalNodes );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.InsertOperation';\n\t}\n\n\t/**\n\t * Creates `InsertOperation` object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/insertoperation~InsertOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tconst children = [];\n\n\t\tfor ( const child of json.nodes ) {\n\t\t\tif ( child.name ) {\n\t\t\t\t// If child has name property, it is an Element.\n\t\t\t\tchildren.push( Element.fromJSON( child ) );\n\t\t\t} else {\n\t\t\t\t// Otherwise, it is a Text node.\n\t\t\t\tchildren.push( Text.fromJSON( child ) );\n\t\t\t}\n\t\t}\n\n\t\treturn new InsertOperation( Position.fromJSON( json.position, document ), children, json.baseVersion );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/markeroperation\n */\n\nimport Operation from './operation';\nimport Range from '../range';\n\n/**\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class MarkerOperation extends Operation {\n\t/**\n\t * @param {String} name Marker name.\n\t * @param {module:engine/model/range~Range} oldRange Marker range before the change.\n\t * @param {module:engine/model/range~Range} newRange Marker range after the change.\n\t * @param {module:engine/model/markercollection~MarkerCollection} markers Marker collection on which change should be executed.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * @param {Boolean} affectsData Specifies whether the marker operation affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( name, oldRange, newRange, markers, baseVersion, affectsData ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Marker name.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Marker range before the change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.oldRange = oldRange ? Range.createFromRange( oldRange ) : null;\n\n\t\t/**\n\t\t * Marker range after the change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/range~Range}\n\t\t */\n\t\tthis.newRange = newRange ? Range.createFromRange( newRange ) : null;\n\n\t\t/**\n\t\t * Specifies whether the marker operation affects the data produced by the data pipeline\n\t\t * (is persisted in the editor's data).\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.affectsData = affectsData;\n\n\t\t/**\n\t\t * Marker collection on which change should be executed.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis._markers = markers;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'marker';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new MarkerOperation( this.name, this.oldRange, this.newRange, this._markers, this.baseVersion, this.affectsData );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation}\n\t */\n\tgetReversed() {\n\t\treturn new MarkerOperation( this.name, this.newRange, this.oldRange, this._markers, this.baseVersion + 1, this.affectsData );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst type = this.newRange ? '_set' : '_remove';\n\n\t\tthis._markers[ type ]( this.name, this.newRange, true, this.affectsData );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tdelete json._markers;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.MarkerOperation';\n\t}\n\n\t/**\n\t * Creates `MarkerOperation` object from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/markeroperation~MarkerOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new MarkerOperation(\n\t\t\tjson.name,\n\t\t\tjson.oldRange ? Range.fromJSON( json.oldRange, document ) : null,\n\t\t\tjson.newRange ? Range.fromJSON( json.newRange, document ) : null,\n\t\t\tdocument.model.markers,\n\t\t\tjson.baseVersion,\n\t\t\tjson.affectsData\n\t\t);\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/nooperation\n */\n\nimport Operation from './operation';\n\n/**\n * Operation which is doing nothing (\"empty operation\", \"do-nothing operation\", \"noop\"). This is an operation,\n * which when executed does not change the tree model. It still has some parameters defined for transformation purposes.\n *\n * In most cases this operation is a result of transforming operations. When transformation returns\n * {@link module:engine/model/operation/nooperation~NoOperation} it means that changes done by the transformed operation\n * have already been applied.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class NoOperation extends Operation {\n\tget type() {\n\t\treturn 'noop';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/nooperation~NoOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new NoOperation( this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/nooperation~NoOperation}\n\t */\n\tgetReversed() {\n\t\treturn new NoOperation( this.baseVersion + 1 );\n\t}\n\n\t_execute() {\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.NoOperation';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/renameoperation\n */\n\nimport Operation from './operation';\nimport Element from '../element';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Position from '../position';\n\n/**\n * Operation to change element's name.\n *\n * Using this class you can change element's name.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class RenameOperation extends Operation {\n\t/**\n\t * Creates an operation that changes element's name.\n\t *\n\t * @param {module:engine/model/position~Position} position Position before an element to change.\n\t * @param {String} oldName Current name of the element.\n\t * @param {String} newName New name for the element.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( position, oldName, newName, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Position before an element to change.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} module:engine/model/operation/renameoperation~RenameOperation#position\n\t\t */\n\t\tthis.position = position;\n\n\t\t/**\n\t\t * Current name of the element.\n\t\t *\n\t\t * @member {String} module:engine/model/operation/renameoperation~RenameOperation#oldName\n\t\t */\n\t\tthis.oldName = oldName;\n\n\t\t/**\n\t\t * New name for the element.\n\t\t *\n\t\t * @member {String} module:engine/model/operation/renameoperation~RenameOperation#newName\n\t\t */\n\t\tthis.newName = newName;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'rename';\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/renameoperation~RenameOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new RenameOperation( Position.createFromPosition( this.position ), this.oldName, this.newName, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/renameoperation~RenameOperation}\n\t */\n\tgetReversed() {\n\t\treturn new RenameOperation( Position.createFromPosition( this.position ), this.newName, this.oldName, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tconst element = this.position.nodeAfter;\n\n\t\tif ( !( element instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Given position is invalid or node after it is not instance of Element.\n\t\t\t *\n\t\t\t * @error rename-operation-wrong-position\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rename-operation-wrong-position: Given position is invalid or node after it is not an instance of Element.'\n\t\t\t);\n\t\t} else if ( element.name !== this.oldName ) {\n\t\t\t/**\n\t\t\t * Element to change has different name than operation's old name.\n\t\t\t *\n\t\t\t * @error rename-operation-wrong-name\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rename-operation-wrong-name: Element to change has different name than operation\\'s old name.'\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tconst element = this.position.nodeAfter;\n\n\t\telement.name = this.newName;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.RenameOperation';\n\t}\n\n\t/**\n\t * Creates `RenameOperation` object from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/attributeoperation~AttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn new RenameOperation( Position.fromJSON( json.position, document ), json.oldName, json.newName, json.baseVersion );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/rootattributeoperation\n */\n\nimport Operation from './operation';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to change root element's attribute. Using this class you can add, remove or change value of the attribute.\n *\n * This operation is needed, because root elements can't be changed through\n * @link module:engine/model/operation/attributeoperation~AttributeOperation}.\n * It is because {@link module:engine/model/operation/attributeoperation~AttributeOperation}\n * requires a range to change and root element can't\n * be a part of range because every {@link module:engine/model/position~Position} has to be inside a root.\n * {@link module:engine/model/position~Position} can't be created before a root element.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class RootAttributeOperation extends Operation {\n\t/**\n\t * Creates an operation that changes, removes or adds attributes on root element.\n\t *\n\t * @see module:engine/model/operation/attributeoperation~AttributeOperation\n\t * @param {module:engine/model/rootelement~RootElement} root Root element to change.\n\t * @param {String} key Key of an attribute to change or remove.\n\t * @param {*} oldValue Old value of the attribute with given key or `null` if adding a new attribute.\n\t * @param {*} newValue New value to set for the attribute. If `null`, then the operation just removes the attribute.\n\t * @param {Number|null} baseVersion Document {@link module:engine/model/document~Document#version} on which operation\n\t * can be applied or `null` if the operation operates on detached (non-document) tree.\n\t */\n\tconstructor( root, key, oldValue, newValue, baseVersion ) {\n\t\tsuper( baseVersion );\n\n\t\t/**\n\t\t * Root element to change.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/rootelement~RootElement}\n\t\t */\n\t\tthis.root = root;\n\n\t\t/**\n\t\t * Key of an attribute to change or remove.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.key = key;\n\n\t\t/**\n\t\t * Old value of the attribute with given key or `null` if adding a new attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.oldValue = oldValue;\n\n\t\t/**\n\t\t * New value to set for the attribute. If `null`, then the operation just removes the attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @member {*}\n\t\t */\n\t\tthis.newValue = newValue;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\tif ( this.oldValue === null ) {\n\t\t\treturn 'addRootAttribute';\n\t\t} else if ( this.newValue === null ) {\n\t\t\treturn 'removeRootAttribute';\n\t\t} else {\n\t\t\treturn 'changeRootAttribute';\n\t\t}\n\t}\n\n\t/**\n\t * Creates and returns an operation that has the same parameters as this operation.\n\t *\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation} Clone of this operation.\n\t */\n\tclone() {\n\t\treturn new RootAttributeOperation( this.root, this.key, this.oldValue, this.newValue, this.baseVersion );\n\t}\n\n\t/**\n\t * See {@link module:engine/model/operation/operation~Operation#getReversed `Operation#getReversed()`}.\n\t *\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation}\n\t */\n\tgetReversed() {\n\t\treturn new RootAttributeOperation( this.root, this.key, this.newValue, this.oldValue, this.baseVersion + 1 );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tif ( this.root != this.root.root || this.root.is( 'documentFragment' ) ) {\n\t\t\t/**\n\t\t\t * The element to change is not a root element.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-not-a-root\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t * @param {*} value\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-not-a-root: The element to change is not a root element.',\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\n\t\tif ( this.oldValue !== null && this.root.getAttribute( this.key ) !== this.oldValue ) {\n\t\t\t/**\n\t\t\t * The attribute which should be removed does not exists for the given node.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-wrong-old-value\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t * @param {*} value\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-wrong-old-value: Changed node has different attribute value than operation\\'s ' +\n\t\t\t\t'old attribute value.',\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\n\t\tif ( this.oldValue === null && this.newValue !== null && this.root.hasAttribute( this.key ) ) {\n\t\t\t/**\n\t\t\t * The attribute with given key already exists for the given node.\n\t\t\t *\n\t\t\t * @error rootattribute-operation-attribute-exists\n\t\t\t * @param {module:engine/model/rootelement~RootElement} root\n\t\t\t * @param {String} key\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-attribute-exists: The attribute with given key already exists.',\n\t\t\t\t{ root: this.root, key: this.key }\n\t\t\t);\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\tif ( this.newValue !== null ) {\n\t\t\tthis.root._setAttribute( this.key, this.newValue );\n\t\t} else {\n\t\t\tthis.root._removeAttribute( this.key );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.RootAttributeOperation';\n\t}\n\n\t/**\n\t * Creates RootAttributeOperation object from deserilized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/rootattributeoperation~RootAttributeOperation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\tif ( !document.getRoot( json.root ) ) {\n\t\t\t/**\n\t\t\t * Cannot create RootAttributeOperation for document. Root with specified name does not exist.\n\t\t\t *\n\t\t\t * @error rootattributeoperation-fromjson-no-root\n\t\t\t * @param {String} rootName\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'rootattribute-operation-fromjson-no-root: Cannot create RootAttributeOperation. Root with specified name does not exist.',\n\t\t\t\t{ rootName: json }\n\t\t\t);\n\t\t}\n\n\t\treturn new RootAttributeOperation( document.getRoot( json.root ), json.key, json.oldValue, json.newValue, json.baseVersion );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/operationfactory\n */\n\nimport AttributeOperation from '../operation/attributeoperation';\nimport InsertOperation from '../operation/insertoperation';\nimport MarkerOperation from '../operation/markeroperation';\nimport MoveOperation from '../operation/moveoperation';\nimport NoOperation from '../operation/nooperation';\nimport Operation from '../operation/operation';\nimport ReinsertOperation from '../operation/reinsertoperation';\nimport RemoveOperation from '../operation/removeoperation';\nimport RenameOperation from '../operation/renameoperation';\nimport RootAttributeOperation from '../operation/rootattributeoperation';\n\nconst operations = {};\noperations[ AttributeOperation.className ] = AttributeOperation;\noperations[ InsertOperation.className ] = InsertOperation;\noperations[ MarkerOperation.className ] = MarkerOperation;\noperations[ MoveOperation.className ] = MoveOperation;\noperations[ NoOperation.className ] = NoOperation;\noperations[ Operation.className ] = Operation;\noperations[ ReinsertOperation.className ] = ReinsertOperation;\noperations[ RemoveOperation.className ] = RemoveOperation;\noperations[ RenameOperation.className ] = RenameOperation;\noperations[ RootAttributeOperation.className ] = RootAttributeOperation;\n\n/**\n * A factory class for creating operations.\n *\n * @abstract\n */\nexport default class OperationFactory {\n\t/**\n\t * Creates concrete `Operation` object from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json Deserialized JSON object.\n\t * @param {module:engine/model/document~Document} document Document on which this operation will be applied.\n\t * @returns {module:engine/model/operation/operation~Operation}\n\t */\n\tstatic fromJSON( json, document ) {\n\t\treturn operations[ json.__className ].fromJSON( json, document );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/deltafactory\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\nimport OperationFactory from '../operation/operationfactory';\n\nconst deserializers = new Map();\n\n/**\n * A factory class for creating operations.\n *\n * Delta is a single, from the user action point of view, change in the editable document, like insert, split or\n * rename element. Delta is composed of operations, which are unit changes needed to be done to execute user action.\n *\n * Multiple deltas are grouped into a single {@link module:engine/model/batch~Batch}.\n */\nexport default class DeltaFactory {\n\t/**\n\t * Creates InsertDelta from deserialized object, i.e. from parsed JSON string.\n\t *\n\t * @param {Object} json\n\t * @param {module:engine/model/document~Document} doc Document on which this delta will be applied.\n\t * @returns {module:engine/model/delta/insertdelta~InsertDelta}\n\t */\n\tstatic fromJSON( json, doc ) {\n\t\tif ( !deserializers.has( json.__className ) ) {\n\t\t\t/**\n\t\t\t * This delta has no defined deserializer.\n\t\t\t *\n\t\t\t * @error delta-fromjson-no-deserializer\n\t\t\t * @param {String} name\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'delta-fromjson-no-deserializer: This delta has no defined deserializer',\n\t\t\t\t{ name: json.__className }\n\t\t\t);\n\t\t}\n\n\t\tconst Delta = deserializers.get( json.__className );\n\n\t\tconst delta = new Delta();\n\n\t\tfor ( const operation of json.operations ) {\n\t\t\tdelta.addOperation( OperationFactory.fromJSON( operation, doc ) );\n\t\t}\n\n\t\t// Rewrite all other properties.\n\t\tfor ( const prop in json ) {\n\t\t\tif ( prop != '__className' && delta[ prop ] === undefined ) {\n\t\t\t\tdelta[ prop ] = json[ prop ];\n\t\t\t}\n\t\t}\n\n\t\treturn delta;\n\t}\n\n\t/**\n\t * Registers a class for delta factory.\n\t *\n\t * @param {Function} Delta A delta class to register.\n\t */\n\tstatic register( Delta ) {\n\t\tdeserializers.set( Delta.className, Delta );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/delta\n */\n\nimport clone from '@ckeditor/ckeditor5-utils/src/lib/lodash/clone';\nimport DeltaFactory from './deltafactory';\n\n/**\n * Base class for all deltas.\n *\n * Delta is a single, from the user action point of view, change in the editable document, like insert, split or\n * rename element. Delta is composed of operations, which are unit changes needed to be done to execute user action.\n *\n * Multiple deltas are grouped into a single {@link module:engine/model/batch~Batch}.\n */\nexport default class Delta {\n\t/**\n\t * Creates a delta instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * {@link module:engine/model/batch~Batch} which delta is a part of. This property is null by default and set by the\n\t\t * {@link module:engine/model/batch~Batch#addDelta} method.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/batch~Batch} module:engine/model/delta/delta~Delta#batch\n\t\t */\n\t\tthis.batch = null;\n\n\t\t/**\n\t\t * Array of operations which compose delta.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/operation/operation~Operation[]} module:engine/model/delta/delta~Delta#operations\n\t\t */\n\t\tthis.operations = [];\n\t}\n\n\t/**\n\t * Returns delta base version which is equal to the base version of the first operation in delta. If there\n\t * are no operations in delta, returns `null`.\n\t *\n\t * @see module:engine/model/document~Document\n\t * @type {Number|null}\n\t */\n\tget baseVersion() {\n\t\tif ( this.operations.length > 0 ) {\n\t\t\treturn this.operations[ 0 ].baseVersion;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * @param {Number} baseVersion\n\t */\n\tset baseVersion( baseVersion ) {\n\t\tfor ( const operation of this.operations ) {\n\t\t\toperation.baseVersion = baseVersion++;\n\t\t}\n\t}\n\n\t/**\n\t * A class that will be used when creating reversed delta.\n\t *\n\t * @private\n\t * @type {Function}\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn Delta;\n\t}\n\n\t/**\n\t * Delta type.\n\t *\n\t * @readonly\n\t * @member {String} #type\n\t */\n\n\t/**\n\t * Add operation to the delta.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation instance.\n\t */\n\taddOperation( operation ) {\n\t\toperation.delta = this;\n\t\tthis.operations.push( operation );\n\n\t\treturn operation;\n\t}\n\n\t/**\n\t * Creates and returns a delta that has the same parameters as this delta.\n\t *\n\t * @returns {module:engine/model/delta/delta~Delta} Clone of this delta.\n\t */\n\tclone() {\n\t\tconst delta = new this.constructor();\n\n\t\tfor ( const op of this.operations ) {\n\t\t\tdelta.addOperation( op.clone() );\n\t\t}\n\n\t\treturn delta;\n\t}\n\n\t/**\n\t * Creates and returns a reverse delta. Reverse delta when executed right after the original delta will bring back\n\t * tree model state to the point before the original delta execution. In other words, it reverses changes done\n\t * by the original delta.\n\t *\n\t * Keep in mind that tree model state may change since executing the original delta, so reverse delta may be \"outdated\".\n\t * In that case you will need to {@link module:engine/model/delta/transform~transform} it by all deltas that were executed after\n\t * the original delta.\n\t *\n\t * @returns {module:engine/model/delta/delta~Delta} Reversed delta.\n\t */\n\tgetReversed() {\n\t\tconst delta = new this._reverseDeltaClass();\n\n\t\tfor ( const op of this.operations ) {\n\t\t\tdelta.addOperation( op.getReversed() );\n\t\t}\n\n\t\tdelta.operations.reverse();\n\n\t\tfor ( let i = 0; i < delta.operations.length; i++ ) {\n\t\t\tdelta.operations[ i ].baseVersion = this.operations[ this.operations.length - 1 ].baseVersion + i + 1;\n\t\t}\n\n\t\treturn delta;\n\t}\n\n\t/**\n\t * Custom toJSON method to make deltas serializable.\n\t *\n\t * @returns {Object} Clone of this delta with added class name.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\tjson.__className = this.constructor.className;\n\n\t\t// Remove parent batch to avoid circular dependencies.\n\t\tdelete json.batch;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Delta class name. Used by {@link #toJSON} method for serialization and\n\t * {@link module:engine/model/delta/deltafactory~DeltaFactory.fromJSON} during deserialization.\n\t *\n\t * @type {String}\n\t * @readonly\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.Delta';\n\t}\n}\n\nDeltaFactory.register( Delta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/attributedelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\nimport NoOperation from '../operation/nooperation';\nimport Range from '../range';\n\n/**\n * To provide specific OT behavior and better collisions solving, methods to change attributes\n * ({@link module:engine/model/writer~Writer#setAttribute} and {@link module:engine/model/writer~Writer#removeAttribute})\n * use `AttributeDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class AttributeDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'attribute';\n\t}\n\n\t/**\n\t * The attribute key that is changed by the delta or `null` if the delta has no operations.\n\t *\n\t * @readonly\n\t * @type {String|null}\n\t */\n\tget key() {\n\t\treturn this.operations[ 0 ] ? this.operations[ 0 ].key : null;\n\t}\n\n\t/**\n\t * The attribute value that is set by the delta or `null` if the delta has no operations.\n\t *\n\t * @readonly\n\t * @type {*|null}\n\t */\n\tget value() {\n\t\treturn this.operations[ 0 ] ? this.operations[ 0 ].newValue : null;\n\t}\n\n\t/**\n\t * The range on which delta operates or `null` if the delta has no operations.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/range~Range|null}\n\t */\n\tget range() {\n\t\t// Check if it is cached.\n\t\tif ( this._range ) {\n\t\t\treturn this._range;\n\t\t}\n\n\t\tlet start = null;\n\t\tlet end = null;\n\n\t\tfor ( const operation of this.operations ) {\n\t\t\tif ( operation instanceof NoOperation ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\tif ( start === null || start.isAfter( operation.range.start ) ) {\n\t\t\t\tstart = operation.range.start;\n\t\t\t}\n\n\t\t\tif ( end === null || end.isBefore( operation.range.end ) ) {\n\t\t\t\tend = operation.range.end;\n\t\t\t}\n\t\t}\n\n\t\tif ( start && end ) {\n\t\t\tthis._range = new Range( start, end );\n\n\t\t\treturn this._range;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\tget _reverseDeltaClass() {\n\t\treturn AttributeDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\ttoJSON() {\n\t\tconst json = super.toJSON();\n\n\t\tdelete json._range;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.AttributeDelta';\n\t}\n}\n\nDeltaFactory.register( AttributeDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/splitdelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\nimport MoveOperation from '../operation/moveoperation';\nimport MergeDelta from '../delta/mergedelta';\n\n/**\n * To provide specific OT behavior and better collisions solving, the {@link module:engine/model/writer~Writer#split} method\n * uses `SplitDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class SplitDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'split';\n\t}\n\n\t/**\n\t * Position of split or `null` if there are no operations in the delta.\n\t *\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget position() {\n\t\treturn this._moveOperation ? this._moveOperation.sourcePosition : null;\n\t}\n\n\t/**\n\t * Operation in the delta that adds to model an element into which split nodes will be moved, or `null` if\n\t * there are no operations in the delta.\n\t *\n\t * Most commonly this will be {@link module:engine/model/operation/insertoperation~InsertOperation an insert operation},\n\t * as `SplitDelta` has to create a new node. If `SplitDelta` was created through\n\t * {@link module:engine/model/delta/delta~Delta#getReversed reversing}\n\t * a {@link module:engine/model/delta/mergedelta~MergeDelta merge delta},\n\t * this will be a {@link module:engine/model/operation/reinsertoperation~ReinsertOperation reinsert operation},\n\t * as we will want to re-insert the exact element that was removed by that merge delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/insertoperation~InsertOperation|\n\t * module:engine/model/operation/reinsertoperation~ReinsertOperation|null}\n\t */\n\tget _cloneOperation() {\n\t\treturn this.operations[ 0 ] || null;\n\t}\n\n\t/**\n\t * Operation in the delta that moves model items, that are after split position, to their new parent or `null`\n\t * if there are no operations in the delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/moveoperation~MoveOperation|null}\n\t */\n\tget _moveOperation() {\n\t\treturn this.operations[ 1 ] && this.operations[ 1 ] instanceof MoveOperation ? this.operations[ 1 ] : null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn MergeDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.SplitDelta';\n\t}\n}\n\nDeltaFactory.register( SplitDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/mergedelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\nimport SplitDelta from './splitdelta';\n\n/**\n * To provide specific OT behavior and better collisions solving, {@link module:engine/model/writer~Writer#merge} method\n * uses the `MergeDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class MergeDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'merge';\n\t}\n\n\t/**\n\t * Position between to merged nodes or `null` if the delta has no operations.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget position() {\n\t\treturn this._removeOperation ? this._removeOperation.sourcePosition : null;\n\t}\n\n\t/**\n\t * Operation in this delta that removes the node after merge position (which will be empty at that point) or\n\t * `null` if the delta has no operations. Note, that after {@link module:engine/model/delta/transform~transform transformation}\n\t * this might be an instance of {@link module:engine/model/operation/moveoperation~MoveOperation} instead of\n\t * {@link module:engine/model/operation/removeoperation~RemoveOperation}.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {module:engine/model/operation/moveoperation~MoveOperation|null}\n\t */\n\tget _removeOperation() {\n\t\treturn this.operations[ 1 ] || null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn SplitDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.MergeDelta';\n\t}\n}\n\nDeltaFactory.register( MergeDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/movedelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, {@link module:engine/model/writer~Writer#move} method\n * uses the `MoveDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class MoveDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'move';\n\t}\n\n\t/**\n\t * Offset size of moved range or `null` if there are no operations in the delta.\n\t *\n\t * @type {Number|null}\n\t */\n\tget howMany() {\n\t\treturn this._moveOperation ? this._moveOperation.howMany : null;\n\t}\n\n\t/**\n\t * {@link module:engine/model/delta/movedelta~MoveDelta#_moveOperation Move operation}\n\t * {@link module:engine/model/operation/moveoperation~MoveOperation#sourcePosition source position} or `null` if there are\n\t * no operations in the delta.\n\t *\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget sourcePosition() {\n\t\treturn this._moveOperation ? this._moveOperation.sourcePosition : null;\n\t}\n\n\t/**\n\t * {@link module:engine/model/delta/movedelta~MoveDelta#_moveOperation Move operation}\n\t * {@link module:engine/model/operation/moveoperation~MoveOperation#targetPosition target position} or `null` if there are\n\t * no operations in the delta.\n\t *\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget targetPosition() {\n\t\treturn this._moveOperation ? this._moveOperation.targetPosition : null;\n\t}\n\n\t/**\n\t * {@link module:engine/model/delta/movedelta~MoveDelta#_moveOperation Move operation} that is saved in this delta or `null`\n\t * if there are no operations in the delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/moveoperation~MoveOperation|null}\n\t */\n\tget _moveOperation() {\n\t\treturn this.operations[ 0 ] || null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn MoveDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.MoveDelta';\n\t}\n}\n\nDeltaFactory.register( MoveDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/removedelta\n */\n\nimport MoveDelta from './movedelta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, {@link module:engine/model/writer~Writer#remove} method\n * uses the `RemoveDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class RemoveDelta extends MoveDelta {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.RemoveDelta';\n\t}\n}\n\nDeltaFactory.register( RemoveDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/renamedelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, the {@link module:engine/model/writer~Writer#rename Batch#rename} method\n * uses the `RenameDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class RenameDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'rename';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn RenameDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.RenameDelta';\n\t}\n}\n\nDeltaFactory.register( RenameDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/wrapdelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\nimport UnwrapDelta from './unwrapdelta';\nimport Range from '../range';\n\n/**\n * To provide specific OT behavior and better collisions solving, {@link module:engine/model/writer~Writer#merge} method\n * uses the `WrapDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class WrapDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'wrap';\n\t}\n\n\t/**\n\t * Range to wrap or `null` if there are no operations in the delta.\n\t *\n\t * @type {module:engine/model/range~Range|null}\n\t */\n\tget range() {\n\t\tconst moveOp = this._moveOperation;\n\n\t\treturn moveOp ? Range.createFromPositionAndShift( moveOp.sourcePosition, moveOp.howMany ) : null;\n\t}\n\n\t/**\n\t * Offset size of range to wrap by the delta or `null` if there are no operations in delta.\n\t *\n\t * @type {Number}\n\t */\n\tget howMany() {\n\t\tconst range = this.range;\n\n\t\treturn range ? range.end.offset - range.start.offset : 0;\n\t}\n\n\t/* eslint-disable max-len */\n\t/**\n\t * Operation that inserts wrapping element or `null` if there are no operations in the delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/insertoperation~InsertOperation|module:engine/model/operation/reinsertoperation~ReinsertOperation}\n\t */\n\t/* eslint-enable max-len */\n\tget _insertOperation() {\n\t\treturn this.operations[ 0 ] || null;\n\t}\n\n\t/**\n\t * Operation that moves wrapped nodes to their new parent or `null` if there are no operations in the delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/moveoperation~MoveOperation|null}\n\t */\n\tget _moveOperation() {\n\t\treturn this.operations[ 1 ] || null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn UnwrapDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.WrapDelta';\n\t}\n}\n\nDeltaFactory.register( WrapDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/unwrapdelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\nimport WrapDelta from './wrapdelta';\n\n/**\n * To provide specific OT behavior and better collisions solving, {@link module:engine/model/writer~Writer#merge} method\n * uses the `UnwrapDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class UnwrapDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'unwrap';\n\t}\n\n\t/**\n\t * Position before unwrapped element or `null` if there are no operations in the delta.\n\t *\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget position() {\n\t\treturn this._moveOperation ? this._moveOperation.targetPosition : null;\n\t}\n\n\t/**\n\t * Operation in the delta that moves unwrapped nodes to their new parent or `null` if there are no operations in the delta.\n\t *\n\t * @protected\n\t * @type {module:engine/model/operation/moveoperation~MoveOperation|null}\n\t */\n\tget _moveOperation() {\n\t\treturn this.operations[ 0 ] || null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn WrapDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.UnwrapDelta';\n\t}\n}\n\nDeltaFactory.register( UnwrapDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/insertdelta\n */\n\nimport Delta from './delta';\nimport RemoveDelta from './removedelta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, the {@link module:engine/model/writer~Writer#insert Batch#insert} method\n * uses the `InsertDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class InsertDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'insert';\n\t}\n\n\t/**\n\t * Position where the delta inserts nodes or `null` if there are no operations in the delta.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/position~Position|null}\n\t */\n\tget position() {\n\t\treturn this._insertOperation ? this._insertOperation.position : null;\n\t}\n\n\t/**\n\t * Node list containing all the nodes inserted by the delta or `null` if there are no operations in the delta.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/nodelist~NodeList|null}\n\t */\n\tget nodes() {\n\t\treturn this._insertOperation ? this._insertOperation.nodes : null;\n\t}\n\n\t/**\n\t * Insert operation that is saved in this delta or `null` if there are no operations in the delta.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {module:engine/model/operation/insertoperation~InsertOperation|null}\n\t */\n\tget _insertOperation() {\n\t\treturn this.operations[ 0 ] || null;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn RemoveDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.InsertDelta';\n\t}\n}\n\nDeltaFactory.register( InsertDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/weakinsertdelta\n */\n\nimport InsertDelta from './insertdelta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, the {@link module:engine/model/writer~Writer#insert} method\n * uses the `WeakInsertDelta` class which inherits from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class WeakInsertDelta extends InsertDelta {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.WeakInsertDelta';\n\t}\n}\n\nDeltaFactory.register( WeakInsertDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/transform\n */\n\nimport InsertOperation from './insertoperation';\nimport AttributeOperation from './attributeoperation';\nimport RootAttributeOperation from './rootattributeoperation';\nimport RenameOperation from './renameoperation';\nimport MarkerOperation from './markeroperation';\nimport MoveOperation from './moveoperation';\nimport RemoveOperation from './removeoperation';\nimport ReinsertOperation from './reinsertoperation';\nimport NoOperation from './nooperation';\nimport Range from '../range';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n/**\n * Transforms given {@link module:engine/model/operation/operation~Operation operation}\n * by another {@link module:engine/model/operation/operation~Operation operation}\n * and returns the result of that transformation as an array containing\n * one or more {@link module:engine/model/operation/operation~Operation operations}.\n *\n * Operations work on specified positions, passed to them when they are created.\n * Whenever {@link module:engine/model/document~Document document}\n * changes, we have to reflect those modifications by updating or \"transforming\" operations which are not yet applied.\n * When an operation is transformed, its parameters may change based on the operation by which it is transformed.\n * If the transform-by operation applied any modifications to the Tree Data Model which affect positions or nodes\n * connected with transformed operation, those changes will be reflected in the parameters of the returned operation(s).\n *\n * Whenever the {@link module:engine/model/document~Document document}\n * has different {@link module:engine/model/document~Document#version}\n * than the operation you want to {@link module:engine/model/model~Model#applyOperation apply}, you need to transform that\n * operation by all operations which were already applied to the {@link module:engine/model/document~Document document} and have greater\n * {@link module:engine/model/document~Document#version} than the operation being applied. Transform them in the same order as those\n * operations which were applied. This way all modifications done to the Tree Data Model will be reflected\n * in the operation parameters and the operation will \"operate\" on \"up-to-date\" version of the Tree Data Model.\n * This is mostly the case with Operational Transformations but it might be needed in particular features as well.\n *\n * In some cases, when given operation apply changes to the same nodes as this operation, two or more operations need\n * to be created as one would not be able to reflect the combination of these operations.\n * This is why an array is returned instead of a single object. All returned operations have to be applied\n * (or further transformed) to get an effect which was intended in pre-transformed operation.\n *\n * Sometimes two operations are in conflict. This happens when they modify the same node in a different way, i.e.\n * set different value for the same attribute or move the node into different positions. When this happens,\n * we need to decide which operation is more important. We can't assume that operation `a` or operation `b` is always\n * more important. In Operational Transformations algorithms we often need to get a result of transforming\n * `a` by `b` and also `b` by `a`. In both transformations the same operation has to be the important one. If we assume\n * that first or the second passed operation is always more important we won't be able to solve this case.\n *\n * @function module:engine/model/operation/transform~transform\n * @param {module:engine/model/operation/operation~Operation} a Operation that will be transformed.\n * @param {module:engine/model/operation/operation~Operation} b Operation to transform by.\n * @param {module:engine/model/delta/transform~transformationContext} [context] Transformation context.\n * @returns {Array.<module:engine/model/operation/operation~Operation>} Result of the transformation.\n */\n\nexport default transform;\n\nconst ot = {\n\tInsertOperation: {\n\t\t// Transforms InsertOperation `a` by InsertOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tInsertOperation( a, b, context ) {\n\t\t\t// Transformed operations are always new instances, not references to the original operations.\n\t\t\tconst transformed = a.clone();\n\n\t\t\t// Check whether there is a forced order of nodes or use `context.isStrong` flag for conflict resolving.\n\t\t\tconst insertBefore = context.insertBefore === undefined ? !context.isStrong : context.insertBefore;\n\n\t\t\t// Transform insert position by the other operation position.\n\t\t\ttransformed.position = transformed.position._getTransformedByInsertion( b.position, b.nodes.maxOffset, insertBefore );\n\n\t\t\treturn [ transformed ];\n\t\t},\n\n\t\tAttributeOperation: doNotUpdate,\n\n\t\tRootAttributeOperation: doNotUpdate,\n\n\t\tRenameOperation: doNotUpdate,\n\n\t\tMarkerOperation: doNotUpdate,\n\n\t\t// Transforms InsertOperation `a` by MoveOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tMoveOperation( a, b, context ) {\n\t\t\tconst transformed = a.clone();\n\n\t\t\t// Check whether there is a forced order of nodes or use `context.isStrong` flag for conflict resolving.\n\t\t\tconst insertBefore = context.insertBefore === undefined ? !context.isStrong : context.insertBefore;\n\n\t\t\t// Transform insert position by the other operation parameters.\n\t\t\ttransformed.position = a.position._getTransformedByMove(\n\t\t\t\tb.sourcePosition,\n\t\t\t\tb.targetPosition,\n\t\t\t\tb.howMany,\n\t\t\t\tinsertBefore,\n\t\t\t\tb.isSticky && !context.forceNotSticky\n\t\t\t);\n\n\t\t\treturn [ transformed ];\n\t\t}\n\t},\n\n\tAttributeOperation: {\n\t\t// Transforms AttributeOperation `a` by InsertOperation `b`. Returns results as an array of operations.\n\t\tInsertOperation( a, b ) {\n\t\t\t// Transform this operation's range.\n\t\t\tconst ranges = a.range._getTransformedByInsertion( b.position, b.nodes.maxOffset, true, false );\n\n\t\t\t// Map transformed range(s) to operations and return them.\n\t\t\treturn ranges.reverse().map( range => {\n\t\t\t\treturn new AttributeOperation( range, a.key, a.oldValue, a.newValue, a.baseVersion );\n\t\t\t} );\n\t\t},\n\n\t\t// Transforms AttributeOperation `a` by AttributeOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tAttributeOperation( a, b, context ) {\n\t\t\tif ( a.key === b.key ) {\n\t\t\t\t// If operations attributes are in conflict, check if their ranges intersect and manage them properly.\n\n\t\t\t\t// First, we want to apply change to the part of a range that has not been changed by the other operation.\n\t\t\t\tconst operations = a.range.getDifference( b.range ).map( range => {\n\t\t\t\t\treturn new AttributeOperation( range, a.key, a.oldValue, a.newValue, a.baseVersion );\n\t\t\t\t} );\n\n\t\t\t\t// Then we take care of the common part of ranges.\n\t\t\t\tconst common = a.range.getIntersection( b.range );\n\n\t\t\t\tif ( common ) {\n\t\t\t\t\t// If this operation is more important, we also want to apply change to the part of the\n\t\t\t\t\t// original range that has already been changed by the other operation. Since that range\n\t\t\t\t\t// got changed we also have to update `oldValue`.\n\t\t\t\t\tif ( context.isStrong ) {\n\t\t\t\t\t\toperations.push( new AttributeOperation( common, b.key, b.newValue, a.newValue, a.baseVersion ) );\n\t\t\t\t\t} else if ( operations.length === 0 ) {\n\t\t\t\t\t\toperations.push( new NoOperation( 0 ) );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\treturn operations;\n\t\t\t} else {\n\t\t\t\t// If operations don't conflict, simply return an array containing just a clone of this operation.\n\t\t\t\treturn [ a.clone() ];\n\t\t\t}\n\t\t},\n\n\t\tRootAttributeOperation: doNotUpdate,\n\n\t\tRenameOperation: doNotUpdate,\n\n\t\tMarkerOperation: doNotUpdate,\n\n\t\t// Transforms AttributeOperation `a` by MoveOperation `b`. Returns results as an array of operations.\n\t\tMoveOperation( a, b ) {\n\t\t\t// Convert MoveOperation properties into a range.\n\t\t\tconst rangeB = Range.createFromPositionAndShift( b.sourcePosition, b.howMany );\n\n\t\t\t// This will aggregate transformed ranges.\n\t\t\tlet ranges = [];\n\n\t\t\t// Difference is a part of changed range that is modified by AttributeOperation but is not affected\n\t\t\t// by MoveOperation. This can be zero, one or two ranges (if moved range is inside changed range).\n\t\t\t// Right now we will make a simplification and join difference ranges and transform them as one. We will cover rangeB later.\n\t\t\tconst difference = joinRanges( a.range.getDifference( rangeB ) );\n\n\t\t\t// Common is a range of nodes that is affected by MoveOperation. So it got moved to other place.\n\t\t\tconst common = a.range.getIntersection( rangeB );\n\n\t\t\tif ( difference !== null ) {\n\t\t\t\t// MoveOperation removes nodes from their original position. We acknowledge this by proper transformation.\n\t\t\t\t// Take the start and the end of the range and transform them by deletion of moved nodes.\n\t\t\t\t// Note that if rangeB was inside AttributeOperation range, only difference.end will be transformed.\n\t\t\t\t// This nicely covers the joining simplification we did in the previous step.\n\t\t\t\tdifference.start = difference.start._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\t\t\t\tdifference.end = difference.end._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\n\t\t\t\t// MoveOperation pastes nodes into target position. We acknowledge this by proper transformation.\n\t\t\t\t// Note that since we operate on transformed difference range, we should transform by\n\t\t\t\t// previously transformed target position.\n\t\t\t\t// Note that we do not use Position._getTransformedByMove on range boundaries because we need to\n\t\t\t\t// transform by insertion a range as a whole, since newTargetPosition might be inside that range.\n\t\t\t\tranges = difference._getTransformedByInsertion( b.getMovedRangeStart(), b.howMany, true, false ).reverse();\n\t\t\t}\n\n\t\t\tif ( common !== null ) {\n\t\t\t\t// Here we do not need to worry that newTargetPosition is inside moved range, because that\n\t\t\t\t// would mean that the MoveOperation targets into itself, and that is incorrect operation.\n\t\t\t\t// Instead, we calculate the new position of that part of original range.\n\t\t\t\tcommon.start = common.start._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\t\t\t\tcommon.end = common.end._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\n\t\t\t\tranges.push( common );\n\t\t\t}\n\n\t\t\t// Map transformed range(s) to operations and return them.\n\t\t\treturn ranges.map( range => {\n\t\t\t\treturn new AttributeOperation( range, a.key, a.oldValue, a.newValue, a.baseVersion );\n\t\t\t} );\n\t\t}\n\t},\n\n\tRootAttributeOperation: {\n\t\tInsertOperation: doNotUpdate,\n\n\t\tAttributeOperation: doNotUpdate,\n\n\t\t// Transforms RootAttributeOperation `a` by RootAttributeOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tRootAttributeOperation( a, b, context ) {\n\t\t\tif ( a.root === b.root && a.key === b.key ) {\n\t\t\t\tif ( ( a.newValue !== b.newValue && !context.isStrong ) || a.newValue === b.newValue ) {\n\t\t\t\t\treturn [ new NoOperation( a.baseVersion ) ];\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn [ a.clone() ];\n\t\t},\n\n\t\tRenameOperation: doNotUpdate,\n\n\t\tMarkerOperation: doNotUpdate,\n\n\t\tMoveOperation: doNotUpdate\n\t},\n\n\tRenameOperation: {\n\t\t// Transforms RenameOperation `a` by InsertOperation `b`. Returns results as an array of operations.\n\t\tInsertOperation( a, b ) {\n\t\t\t// Clone the operation, we don't want to alter the original operation.\n\t\t\tconst clone = a.clone();\n\n\t\t\t// Transform this operation's position.\n\t\t\tclone.position = clone.position._getTransformedByInsertion( b.position, b.nodes.maxOffset, true );\n\n\t\t\treturn [ clone ];\n\t\t},\n\n\t\tAttributeOperation: doNotUpdate,\n\n\t\tRootAttributeOperation: doNotUpdate,\n\n\t\t// Transforms RenameOperation `a` by RenameOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tRenameOperation( a, b, context ) {\n\t\t\t// Clone the operation, we don't want to alter the original operation.\n\t\t\tconst clone = a.clone();\n\n\t\t\tif ( a.position.isEqual( b.position ) ) {\n\t\t\t\tif ( context.isStrong ) {\n\t\t\t\t\tclone.oldName = b.newName;\n\t\t\t\t} else {\n\t\t\t\t\treturn [ new NoOperation( a.baseVersion ) ];\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn [ clone ];\n\t\t},\n\n\t\tMarkerOperation: doNotUpdate,\n\n\t\t// Transforms RenameOperation `a` by MoveOperation `b`. Returns results as an array of operations.\n\t\tMoveOperation( a, b ) {\n\t\t\tconst clone = a.clone();\n\t\t\tconst isSticky = clone.position.isEqual( b.sourcePosition );\n\n\t\t\tclone.position = clone.position._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany, true, isSticky );\n\n\t\t\treturn [ clone ];\n\t\t}\n\t},\n\n\tMarkerOperation: {\n\t\t// Transforms MarkerOperation `a` by InsertOperation `b`. Returns results as an array of operations.\n\t\tInsertOperation( a, b ) {\n\t\t\t// Clone the operation, we don't want to alter the original operation.\n\t\t\tconst clone = a.clone();\n\n\t\t\tif ( clone.oldRange ) {\n\t\t\t\tclone.oldRange = clone.oldRange._getTransformedByInsertion( b.position, b.nodes.maxOffset, false, false )[ 0 ];\n\t\t\t}\n\n\t\t\tif ( clone.newRange ) {\n\t\t\t\tclone.newRange = clone.newRange._getTransformedByInsertion( b.position, b.nodes.maxOffset, false, false )[ 0 ];\n\t\t\t}\n\n\t\t\treturn [ clone ];\n\t\t},\n\n\t\tAttributeOperation: doNotUpdate,\n\n\t\tRootAttributeOperation: doNotUpdate,\n\n\t\tRenameOperation: doNotUpdate,\n\n\t\t// Transforms MarkerOperation `a` by MarkerOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tMarkerOperation( a, b, context ) {\n\t\t\t// Clone the operation, we don't want to alter the original operation.\n\t\t\tconst clone = a.clone();\n\n\t\t\tif ( a.name == b.name ) {\n\t\t\t\tif ( context.isStrong ) {\n\t\t\t\t\tclone.oldRange = b.newRange;\n\t\t\t\t} else {\n\t\t\t\t\treturn [ new NoOperation( a.baseVersion ) ];\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn [ clone ];\n\t\t},\n\n\t\t// Transforms MarkerOperation `a` by MoveOperation `b`. Returns results as an array of operations.\n\t\tMoveOperation( a, b ) {\n\t\t\t// Clone the operation, we don't want to alter the original operation.\n\t\t\tconst clone = a.clone();\n\n\t\t\tif ( clone.oldRange ) {\n\t\t\t\tconst oldRanges = clone.oldRange._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\t\t\t\tclone.oldRange = Range.createFromRanges( oldRanges );\n\t\t\t}\n\n\t\t\tif ( clone.newRange ) {\n\t\t\t\tconst newRanges = clone.newRange._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany );\n\t\t\t\tclone.newRange = Range.createFromRanges( newRanges );\n\t\t\t}\n\n\t\t\treturn [ clone ];\n\t\t}\n\t},\n\n\tMoveOperation: {\n\t\t// Transforms MoveOperation `a` by InsertOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tInsertOperation( a, b, context ) {\n\t\t\t// Create range from MoveOperation properties and transform it by insertion.\n\t\t\tlet range = Range.createFromPositionAndShift( a.sourcePosition, a.howMany );\n\t\t\tconst includeB = a.isSticky && !context.forceNotSticky;\n\n\t\t\trange = range._getTransformedByInsertion( b.position, b.nodes.maxOffset, false, includeB )[ 0 ];\n\n\t\t\t// Check whether there is a forced order of nodes or use `context.isStrong` flag for conflict resolving.\n\t\t\tconst insertBefore = context.insertBefore === undefined ? !context.isStrong : context.insertBefore;\n\n\t\t\tconst result = new a.constructor(\n\t\t\t\trange.start,\n\t\t\t\trange.end.offset - range.start.offset,\n\t\t\t\ta.targetPosition._getTransformedByInsertion( b.position, b.nodes.maxOffset, insertBefore ),\n\t\t\t\ta.baseVersion\n\t\t\t);\n\n\t\t\tresult.isSticky = a.isSticky;\n\n\t\t\treturn [ result ];\n\t\t},\n\n\t\tAttributeOperation: doNotUpdate,\n\n\t\tRootAttributeOperation: doNotUpdate,\n\n\t\tRenameOperation: doNotUpdate,\n\n\t\tMarkerOperation: doNotUpdate,\n\n\t\t// Transforms MoveOperation `a` by MoveOperation `b`. Accepts a flag stating whether `a` is more important\n\t\t// than `b` when it comes to resolving conflicts. Returns results as an array of operations.\n\t\tMoveOperation( a, b, context ) {\n\t\t\t//\n\t\t\t// Setting and evaluating some variables that will be used in special cases and default algorithm.\n\t\t\t//\n\t\t\t// Create ranges from `MoveOperations` properties.\n\t\t\tconst rangeA = Range.createFromPositionAndShift( a.sourcePosition, a.howMany );\n\t\t\tconst rangeB = Range.createFromPositionAndShift( b.sourcePosition, b.howMany );\n\n\t\t\t// Assign `context.isStrong` to a different variable, because the value may change during execution of\n\t\t\t// this algorithm and we do not want to override original `context.isStrong` that will be used in later transformations.\n\t\t\tlet isStrong = context.isStrong;\n\n\t\t\t// Whether range moved by operation `b` is includable in operation `a` move range.\n\t\t\t// For this, `a` operation has to be sticky (so `b` sticks to the range) and context has to allow stickiness.\n\t\t\tconst includeB = a.isSticky && !context.forceNotSticky;\n\n\t\t\t// Evaluate new target position for transformed operation.\n\t\t\t// Check whether there is a forced order of nodes or use `isStrong` flag for conflict resolving.\n\t\t\tconst insertBefore = context.insertBefore === undefined ? !isStrong : context.insertBefore;\n\n\t\t\t// `a.targetPosition` could be affected by the `b` operation. We will transform it.\n\t\t\tconst newTargetPosition = a.targetPosition._getTransformedByMove(\n\t\t\t\tb.sourcePosition,\n\t\t\t\tb.targetPosition,\n\t\t\t\tb.howMany,\n\t\t\t\tinsertBefore,\n\t\t\t\tb.isSticky && !context.forceNotSticky\n\t\t\t);\n\n\t\t\t//\n\t\t\t// Special case #1 + mirror.\n\t\t\t//\n\t\t\t// Special case when both move operations' target positions are inside nodes that are\n\t\t\t// being moved by the other move operation. So in other words, we move ranges into inside of each other.\n\t\t\t// This case can't be solved reasonably (on the other hand, it should not happen often).\n\t\t\tif ( moveTargetIntoMovedRange( a, b ) && moveTargetIntoMovedRange( b, a ) ) {\n\t\t\t\t// Instead of transforming operation, we return a reverse of the operation that we transform by.\n\t\t\t\t// So when the results of this \"transformation\" will be applied, `b` MoveOperation will get reversed.\n\t\t\t\treturn [ b.getReversed() ];\n\t\t\t}\n\t\t\t//\n\t\t\t// End of special case #1.\n\t\t\t//\n\n\t\t\t//\n\t\t\t// Special case #2.\n\t\t\t//\n\t\t\t// Check if `b` operation targets inside `rangeA`. Use stickiness if possible.\n\t\t\tconst bTargetsToA = rangeA.containsPosition( b.targetPosition ) ||\n\t\t\t\t( rangeA.start.isEqual( b.targetPosition ) && includeB ) ||\n\t\t\t\t( rangeA.end.isEqual( b.targetPosition ) && includeB );\n\n\t\t\t// If `b` targets to `rangeA` and `rangeA` contains `rangeB`, `b` operation has no influence on `a` operation.\n\t\t\t// You might say that operation `b` is captured inside operation `a`.\n\t\t\tif ( bTargetsToA && rangeA.containsRange( rangeB, true ) ) {\n\t\t\t\t// There is a mini-special case here, where `rangeB` is on other level than `rangeA`. That's why\n\t\t\t\t// we need to transform `a` operation anyway.\n\t\t\t\trangeA.start = rangeA.start._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany, !includeB );\n\t\t\t\trangeA.end = rangeA.end._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany, includeB );\n\n\t\t\t\treturn makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition, a );\n\t\t\t}\n\n\t\t\t//\n\t\t\t// Special case #2 mirror.\n\t\t\t//\n\t\t\tconst aTargetsToB = rangeB.containsPosition( a.targetPosition ) ||\n\t\t\t\t( rangeB.start.isEqual( a.targetPosition ) && b.isSticky && !context.forceNotSticky ) ||\n\t\t\t\t( rangeB.end.isEqual( a.targetPosition ) && b.isSticky && !context.forceNotSticky );\n\n\t\t\tif ( aTargetsToB && rangeB.containsRange( rangeA, true ) ) {\n\t\t\t\t// `a` operation is \"moved together\" with `b` operation.\n\t\t\t\t// Here, just move `rangeA` \"inside\" `rangeB`.\n\t\t\t\trangeA.start = rangeA.start._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\t\t\t\trangeA.end = rangeA.end._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\n\t\t\t\treturn makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition, a );\n\t\t\t}\n\t\t\t//\n\t\t\t// End of special case #2.\n\t\t\t//\n\n\t\t\t//\n\t\t\t// Special case #3 + mirror.\n\t\t\t//\n\t\t\t// `rangeA` has a node which is an ancestor of `rangeB`. In other words, `rangeB` is inside `rangeA`\n\t\t\t// but not on the same tree level. In such case ranges have common part but we have to treat it\n\t\t\t// differently, because in such case those ranges are not really conflicting and should be treated like\n\t\t\t// two separate ranges. Also we have to discard two difference parts.\n\t\t\tconst aCompB = compareArrays( a.sourcePosition.getParentPath(), b.sourcePosition.getParentPath() );\n\n\t\t\tif ( aCompB == 'prefix' || aCompB == 'extension' ) {\n\t\t\t\t// Transform `rangeA` by `b` operation and make operation out of it, and that's all.\n\t\t\t\t// Note that this is a simplified version of default case, but here we treat the common part (whole `rangeA`)\n\t\t\t\t// like a one difference part.\n\t\t\t\trangeA.start = rangeA.start._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany, !includeB );\n\t\t\t\trangeA.end = rangeA.end._getTransformedByMove( b.sourcePosition, b.targetPosition, b.howMany, includeB );\n\n\t\t\t\treturn makeMoveOperationsFromRanges( [ rangeA ], newTargetPosition, a );\n\t\t\t}\n\t\t\t//\n\t\t\t// End of special case #3.\n\t\t\t//\n\n\t\t\t//\n\t\t\t// Default case - ranges are on the same level or are not connected with each other.\n\t\t\t//\n\t\t\t// Modifier for default case.\n\t\t\t// Modifies `isStrong` flag in certain conditions.\n\t\t\t//\n\t\t\t// If only one of operations is a remove operation, we force remove operation to be the \"stronger\" one\n\t\t\t// to provide more expected results. This is done only if `context.forceWeakRemove` is set to `false`.\n\t\t\t// `context.forceWeakRemove` is set to `true` in certain conditions when transformation takes place during undo.\n\t\t\tif ( !context.forceWeakRemove ) {\n\t\t\t\tif ( a instanceof RemoveOperation && !( b instanceof RemoveOperation ) ) {\n\t\t\t\t\tisStrong = true;\n\t\t\t\t} else if ( !( a instanceof RemoveOperation ) && b instanceof RemoveOperation ) {\n\t\t\t\t\tisStrong = false;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Handle operation's source ranges - check how `rangeA` is affected by `b` operation.\n\t\t\t// This will aggregate transformed ranges.\n\t\t\tconst ranges = [];\n\n\t\t\t// Get the \"difference part\" of `a` operation source range.\n\t\t\t// This is an array with one or two ranges. Two ranges if `rangeB` is inside `rangeA`.\n\t\t\tconst difference = rangeA.getDifference( rangeB );\n\n\t\t\tfor ( const range of difference ) {\n\t\t\t\t// Transform those ranges by `b` operation. For example if `b` moved range from before those ranges, fix those ranges.\n\t\t\t\trange.start = range.start._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\t\t\t\trange.end = range.end._getTransformedByDeletion( b.sourcePosition, b.howMany );\n\n\t\t\t\t// If `b` operation targets into `rangeA` on the same level, spread `rangeA` into two ranges.\n\t\t\t\tconst shouldSpread = compareArrays( range.start.getParentPath(), b.getMovedRangeStart().getParentPath() ) == 'same';\n\t\t\t\tconst newRanges = range._getTransformedByInsertion( b.getMovedRangeStart(), b.howMany, shouldSpread, includeB );\n\n\t\t\t\tranges.push( ...newRanges );\n\t\t\t}\n\n\t\t\t// Then, we have to manage the \"common part\" of both move ranges.\n\t\t\tconst common = rangeA.getIntersection( rangeB );\n\n\t\t\tif ( common !== null && isStrong && !bTargetsToA ) {\n\t\t\t\t// Calculate the new position of that part of original range.\n\t\t\t\tcommon.start = common.start._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\t\t\t\tcommon.end = common.end._getCombined( b.sourcePosition, b.getMovedRangeStart() );\n\n\t\t\t\t// Take care of proper range order.\n\t\t\t\t//\n\t\t\t\t// Put `common` at appropriate place. Keep in mind that we are interested in original order.\n\t\t\t\t// Basically there are only three cases: there is zero, one or two difference ranges.\n\t\t\t\t//\n\t\t\t\t// If there is zero difference ranges, just push `common` in the array.\n\t\t\t\tif ( ranges.length === 0 ) {\n\t\t\t\t\tranges.push( common );\n\t\t\t\t}\n\t\t\t\t// If there is one difference range, we need to check whether common part was before it or after it.\n\t\t\t\telse if ( ranges.length == 1 ) {\n\t\t\t\t\tif ( rangeB.start.isBefore( rangeA.start ) || rangeB.start.isEqual( rangeA.start ) ) {\n\t\t\t\t\t\tranges.unshift( common );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tranges.push( common );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t\t// If there are more ranges (which means two), put common part between them. This is the only scenario\n\t\t\t\t// where there could be two difference ranges so we don't have to make any comparisons.\n\t\t\t\telse {\n\t\t\t\t\tranges.splice( 1, 0, common );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( ranges.length === 0 ) {\n\t\t\t\t// If there are no \"source ranges\", nothing should be changed.\n\t\t\t\t// Note that this can happen only if `isStrong == false` and `rangeA.isEqual( rangeB )`.\n\t\t\t\treturn [ new NoOperation( a.baseVersion ) ];\n\t\t\t}\n\n\t\t\treturn makeMoveOperationsFromRanges( ranges, newTargetPosition, a );\n\t\t}\n\t}\n};\n\nfunction transform( a, b, context = { isStrong: false } ) {\n\tlet group, algorithm;\n\n\tif ( a instanceof InsertOperation ) {\n\t\tgroup = ot.InsertOperation;\n\t} else if ( a instanceof AttributeOperation ) {\n\t\tgroup = ot.AttributeOperation;\n\t} else if ( a instanceof RootAttributeOperation ) {\n\t\tgroup = ot.RootAttributeOperation;\n\t} else if ( a instanceof RenameOperation ) {\n\t\tgroup = ot.RenameOperation;\n\t} else if ( a instanceof MarkerOperation ) {\n\t\tgroup = ot.MarkerOperation;\n\t} else if ( a instanceof MoveOperation ) {\n\t\tgroup = ot.MoveOperation;\n\t} else {\n\t\talgorithm = doNotUpdate;\n\t}\n\n\tif ( group ) {\n\t\tif ( b instanceof InsertOperation ) {\n\t\t\talgorithm = group.InsertOperation;\n\t\t} else if ( b instanceof AttributeOperation ) {\n\t\t\talgorithm = group.AttributeOperation;\n\t\t} else if ( b instanceof RootAttributeOperation ) {\n\t\t\talgorithm = group.RootAttributeOperation;\n\t\t} else if ( b instanceof RenameOperation ) {\n\t\t\talgorithm = group.RenameOperation;\n\t\t} else if ( b instanceof MarkerOperation ) {\n\t\t\talgorithm = group.MarkerOperation;\n\t\t} else if ( b instanceof MoveOperation ) {\n\t\t\talgorithm = group.MoveOperation;\n\t\t} else {\n\t\t\talgorithm = doNotUpdate;\n\t\t}\n\t}\n\n\tconst transformed = algorithm( a, b, context );\n\n\treturn updateBaseVersions( a.baseVersion, transformed );\n}\n\n// When we don't want to update an operation, we create and return a clone of it.\n// Returns the operation in \"unified format\" - wrapped in an Array.\nfunction doNotUpdate( operation ) {\n\treturn [ operation.clone() ];\n}\n\n// Takes an Array of operations and sets consecutive base versions for them, starting from given base version.\n// Returns the passed array.\nfunction updateBaseVersions( baseVersion, operations ) {\n\tfor ( let i = 0; i < operations.length; i++ ) {\n\t\toperations[ i ].baseVersion = baseVersion + i + 1;\n\t}\n\n\treturn operations;\n}\n\n// Checks whether MoveOperation targetPosition is inside a node from the moved range of the other MoveOperation.\nfunction moveTargetIntoMovedRange( a, b ) {\n\treturn a.targetPosition._getTransformedByDeletion( b.sourcePosition, b.howMany ) === null;\n}\n\n// Gets an array of Ranges and produces one Range out of it. The root of a new range will be same as\n// the root of the first range in the array. If any of given ranges has different root than the first range,\n// it will be discarded.\nfunction joinRanges( ranges ) {\n\tif ( ranges.length === 0 ) {\n\t\treturn null;\n\t} else if ( ranges.length == 1 ) {\n\t\treturn ranges[ 0 ];\n\t} else {\n\t\tranges[ 0 ].end = ranges[ ranges.length - 1 ].end;\n\n\t\treturn ranges[ 0 ];\n\t}\n}\n\n// Helper function for `MoveOperation` x `MoveOperation` transformation.\n// Convert given ranges and target position to move operations and return them.\n// Ranges and target position will be transformed on-the-fly when generating operations.\n// Given `ranges` should be in the order of how they were in the original transformed operation.\n// Given `targetPosition` is the target position of the first range from `ranges`.\nfunction makeMoveOperationsFromRanges( ranges, targetPosition, a ) {\n\t// At this moment we have some ranges and a target position, to which those ranges should be moved.\n\t// Order in `ranges` array is the go-to order of after transformation.\n\t//\n\t// We are almost done. We have `ranges` and `targetPosition` to make operations from.\n\t// Unfortunately, those operations may affect each other. Precisely, first operation after move\n\t// may affect source range and target position of second and third operation. Same with second\n\t// operation affecting third.\n\t//\n\t// We need to fix those source ranges and target positions once again, before converting `ranges` to operations.\n\tconst operations = [];\n\n\t// Keep in mind that nothing will be transformed if there is just one range in `ranges`.\n\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t// Create new operation out of a range and target position.\n\t\tconst op = makeMoveOperation( ranges[ i ], targetPosition, a.isSticky );\n\n\t\toperations.push( op );\n\n\t\t// Transform other ranges by the generated operation.\n\t\tfor ( let j = i + 1; j < ranges.length; j++ ) {\n\t\t\t// All ranges in `ranges` array should be:\n\t\t\t// * non-intersecting (these are part of original operation source range), and\n\t\t\t// * `targetPosition` does not target into them (opposite would mean that transformed operation targets \"inside itself\").\n\t\t\t//\n\t\t\t// This means that the transformation will be \"clean\" and always return one result.\n\t\t\tranges[ j ] = ranges[ j ]._getTransformedByMove( op.sourcePosition, op.targetPosition, op.howMany )[ 0 ];\n\t\t}\n\n\t\ttargetPosition = targetPosition._getTransformedByMove( op.sourcePosition, op.targetPosition, op.howMany, true, false );\n\t}\n\n\treturn operations;\n}\n\nfunction makeMoveOperation( range, targetPosition, isSticky ) {\n\t// We want to keep correct operation class.\n\tlet OperationClass;\n\n\tif ( targetPosition.root.rootName == '$graveyard' ) {\n\t\tOperationClass = RemoveOperation;\n\t} else if ( range.start.root.rootName == '$graveyard' ) {\n\t\tOperationClass = ReinsertOperation;\n\t} else {\n\t\tOperationClass = MoveOperation;\n\t}\n\n\tconst result = new OperationClass(\n\t\trange.start,\n\t\trange.end.offset - range.start.offset,\n\t\ttargetPosition,\n\t\t0 // Is corrected anyway later.\n\t);\n\n\tresult.isSticky = isSticky;\n\n\treturn result;\n}\n","/**\n * The base implementation of `_.slice` without an iteratee call guard.\n *\n * @private\n * @param {Array} array The array to slice.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the slice of `array`.\n */\nfunction baseSlice(array, start, end) {\n  var index = -1,\n      length = array.length;\n\n  if (start < 0) {\n    start = -start > length ? 0 : (length + start);\n  }\n  end = end > length ? length : end;\n  if (end < 0) {\n    end += length;\n  }\n  length = start > end ? 0 : ((end - start) >>> 0);\n  start >>>= 0;\n\n  var result = Array(length);\n  while (++index < length) {\n    result[index] = array[index + start];\n  }\n  return result;\n}\n\nexport default baseSlice;\n","import baseSlice from './_baseSlice';\nimport isIterateeCall from './_isIterateeCall';\nimport toInteger from './toInteger';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeCeil = Math.ceil,\n    nativeMax = Math.max;\n\n/**\n * Creates an array of elements split into groups the length of `size`.\n * If `array` can't be split evenly, the final chunk will be the remaining\n * elements.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to process.\n * @param {number} [size=1] The length of each chunk\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the new array of chunks.\n * @example\n *\n * _.chunk(['a', 'b', 'c', 'd'], 2);\n * // => [['a', 'b'], ['c', 'd']]\n *\n * _.chunk(['a', 'b', 'c', 'd'], 3);\n * // => [['a', 'b', 'c'], ['d']]\n */\nfunction chunk(array, size, guard) {\n  if ((guard ? isIterateeCall(array, size, guard) : size === undefined)) {\n    size = 1;\n  } else {\n    size = nativeMax(toInteger(size), 0);\n  }\n  var length = array ? array.length : 0;\n  if (!length || size < 1) {\n    return [];\n  }\n  var index = 0,\n      resIndex = 0,\n      result = Array(nativeCeil(length / size));\n\n  while (index < length) {\n    result[resIndex++] = baseSlice(array, index, (index += size));\n  }\n  return result;\n}\n\nexport default chunk;\n","/**\n * Creates an array with all falsey values removed. The values `false`, `null`,\n * `0`, `\"\"`, `undefined`, and `NaN` are falsey.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to compact.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.compact([0, 1, false, 2, '', 3]);\n * // => [1, 2, 3]\n */\nfunction compact(array) {\n  var index = -1,\n      length = array ? array.length : 0,\n      resIndex = 0,\n      result = [];\n\n  while (++index < length) {\n    var value = array[index];\n    if (value) {\n      result[resIndex++] = value;\n    }\n  }\n  return result;\n}\n\nexport default compact;\n","import isArguments from './isArguments';\nimport isArray from './isArray';\n\n/**\n * Checks if `value` is a flattenable `arguments` object or array.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` is flattenable, else `false`.\n */\nfunction isFlattenable(value) {\n  return isArray(value) || isArguments(value);\n}\n\nexport default isFlattenable;\n","import arrayPush from './_arrayPush';\nimport isFlattenable from './_isFlattenable';\n\n/**\n * The base implementation of `_.flatten` with support for restricting flattening.\n *\n * @private\n * @param {Array} array The array to flatten.\n * @param {number} depth The maximum recursion depth.\n * @param {boolean} [predicate=isFlattenable] The function invoked per iteration.\n * @param {boolean} [isStrict] Restrict to values that pass `predicate` checks.\n * @param {Array} [result=[]] The initial result value.\n * @returns {Array} Returns the new flattened array.\n */\nfunction baseFlatten(array, depth, predicate, isStrict, result) {\n  var index = -1,\n      length = array.length;\n\n  predicate || (predicate = isFlattenable);\n  result || (result = []);\n\n  while (++index < length) {\n    var value = array[index];\n    if (depth > 0 && predicate(value)) {\n      if (depth > 1) {\n        // Recursively flatten arrays (susceptible to call stack limits).\n        baseFlatten(value, depth - 1, predicate, isStrict, result);\n      } else {\n        arrayPush(result, value);\n      }\n    } else if (!isStrict) {\n      result[result.length] = value;\n    }\n  }\n  return result;\n}\n\nexport default baseFlatten;\n","import arrayPush from './_arrayPush';\nimport baseFlatten from './_baseFlatten';\nimport copyArray from './_copyArray';\nimport isArray from './isArray';\n\n/**\n * Creates a new array concatenating `array` with any additional arrays\n * and/or values.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to concatenate.\n * @param {...*} [values] The values to concatenate.\n * @returns {Array} Returns the new concatenated array.\n * @example\n *\n * var array = [1];\n * var other = _.concat(array, 2, [3], [[4]]);\n *\n * console.log(other);\n * // => [1, 2, 3, [4]]\n *\n * console.log(array);\n * // => [1]\n */\nfunction concat() {\n  var length = arguments.length,\n      args = Array(length ? length - 1 : 0),\n      array = arguments[0],\n      index = length;\n\n  while (index--) {\n    args[index - 1] = arguments[index];\n  }\n  return length\n    ? arrayPush(isArray(array) ? copyArray(array) : [array], baseFlatten(args, 1))\n    : [];\n}\n\nexport default concat;\n","/**\n * Gets the index at which the first occurrence of `NaN` is found in `array`.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {number} fromIndex The index to search from.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {number} Returns the index of the matched `NaN`, else `-1`.\n */\nfunction indexOfNaN(array, fromIndex, fromRight) {\n  var length = array.length,\n      index = fromIndex + (fromRight ? 0 : -1);\n\n  while ((fromRight ? index-- : ++index < length)) {\n    var other = array[index];\n    if (other !== other) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default indexOfNaN;\n","import indexOfNaN from './_indexOfNaN';\n\n/**\n * The base implementation of `_.indexOf` without `fromIndex` bounds checks.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction baseIndexOf(array, value, fromIndex) {\n  if (value !== value) {\n    return indexOfNaN(array, fromIndex);\n  }\n  var index = fromIndex - 1,\n      length = array.length;\n\n  while (++index < length) {\n    if (array[index] === value) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default baseIndexOf;\n","import baseIndexOf from './_baseIndexOf';\n\n/**\n * A specialized version of `_.includes` for arrays without support for\n * specifying an index to search from.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {*} target The value to search for.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\nfunction arrayIncludes(array, value) {\n  return !!array.length && baseIndexOf(array, value, 0) > -1;\n}\n\nexport default arrayIncludes;\n","/**\n * This function is like `arrayIncludes` except that it accepts a comparator.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {*} target The value to search for.\n * @param {Function} comparator The comparator invoked per element.\n * @returns {boolean} Returns `true` if `target` is found, else `false`.\n */\nfunction arrayIncludesWith(array, value, comparator) {\n  var index = -1,\n      length = array.length;\n\n  while (++index < length) {\n    if (comparator(value, array[index])) {\n      return true;\n    }\n  }\n  return false;\n}\n\nexport default arrayIncludesWith;\n","/**\n * A specialized version of `_.map` for arrays without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} iteratee The function invoked per iteration.\n * @returns {Array} Returns the new mapped array.\n */\nfunction arrayMap(array, iteratee) {\n  var index = -1,\n      length = array.length,\n      result = Array(length);\n\n  while (++index < length) {\n    result[index] = iteratee(array[index], index, array);\n  }\n  return result;\n}\n\nexport default arrayMap;\n","/**\n * The base implementation of `_.unary` without support for storing wrapper metadata.\n *\n * @private\n * @param {Function} func The function to cap arguments for.\n * @returns {Function} Returns the new capped function.\n */\nfunction baseUnary(func) {\n  return function(value) {\n    return func(value);\n  };\n}\n\nexport default baseUnary;\n","/**\n * Checks if a cache value for `key` exists.\n *\n * @private\n * @param {Object} cache The cache to query.\n * @param {string} key The key of the entry to check.\n * @returns {boolean} Returns `true` if an entry for `key` exists, else `false`.\n */\nfunction cacheHas(cache, key) {\n  return cache.has(key);\n}\n\nexport default cacheHas;\n","import SetCache from './_SetCache';\nimport arrayIncludes from './_arrayIncludes';\nimport arrayIncludesWith from './_arrayIncludesWith';\nimport arrayMap from './_arrayMap';\nimport baseUnary from './_baseUnary';\nimport cacheHas from './_cacheHas';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * The base implementation of methods like `_.difference` without support\n * for excluding multiple arrays or iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Array} values The values to exclude.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n */\nfunction baseDifference(array, values, iteratee, comparator) {\n  var index = -1,\n      includes = arrayIncludes,\n      isCommon = true,\n      length = array.length,\n      result = [],\n      valuesLength = values.length;\n\n  if (!length) {\n    return result;\n  }\n  if (iteratee) {\n    values = arrayMap(values, baseUnary(iteratee));\n  }\n  if (comparator) {\n    includes = arrayIncludesWith;\n    isCommon = false;\n  }\n  else if (values.length >= LARGE_ARRAY_SIZE) {\n    includes = cacheHas;\n    isCommon = false;\n    values = new SetCache(values);\n  }\n  outer:\n  while (++index < length) {\n    var value = array[index],\n        computed = iteratee ? iteratee(value) : value;\n\n    value = (comparator || value !== 0) ? value : 0;\n    if (isCommon && computed === computed) {\n      var valuesIndex = valuesLength;\n      while (valuesIndex--) {\n        if (values[valuesIndex] === computed) {\n          continue outer;\n        }\n      }\n      result.push(value);\n    }\n    else if (!includes(values, computed, comparator)) {\n      result.push(value);\n    }\n  }\n  return result;\n}\n\nexport default baseDifference;\n","import baseDifference from './_baseDifference';\nimport baseFlatten from './_baseFlatten';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport rest from './rest';\n\n/**\n * Creates an array of unique `array` values not included in the other given\n * arrays using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons. The order of result values is determined by the\n * order they occur in the first array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.without, _.xor\n * @example\n *\n * _.difference([3, 2, 1], [4, 2]);\n * // => [3, 1]\n */\nvar difference = rest(function(array, values) {\n  return isArrayLikeObject(array)\n    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true))\n    : [];\n});\n\nexport default difference;\n","import Stack from './_Stack';\nimport baseIsEqual from './_baseIsEqual';\n\n/** Used to compose bitmasks for comparison styles. */\nvar UNORDERED_COMPARE_FLAG = 1,\n    PARTIAL_COMPARE_FLAG = 2;\n\n/**\n * The base implementation of `_.isMatch` without support for iteratee shorthands.\n *\n * @private\n * @param {Object} object The object to inspect.\n * @param {Object} source The object of property values to match.\n * @param {Array} matchData The property names, values, and compare flags to match.\n * @param {Function} [customizer] The function to customize comparisons.\n * @returns {boolean} Returns `true` if `object` is a match, else `false`.\n */\nfunction baseIsMatch(object, source, matchData, customizer) {\n  var index = matchData.length,\n      length = index,\n      noCustomizer = !customizer;\n\n  if (object == null) {\n    return !length;\n  }\n  object = Object(object);\n  while (index--) {\n    var data = matchData[index];\n    if ((noCustomizer && data[2])\n          ? data[1] !== object[data[0]]\n          : !(data[0] in object)\n        ) {\n      return false;\n    }\n  }\n  while (++index < length) {\n    data = matchData[index];\n    var key = data[0],\n        objValue = object[key],\n        srcValue = data[1];\n\n    if (noCustomizer && data[2]) {\n      if (objValue === undefined && !(key in object)) {\n        return false;\n      }\n    } else {\n      var stack = new Stack;\n      if (customizer) {\n        var result = customizer(objValue, srcValue, key, object, source, stack);\n      }\n      if (!(result === undefined\n            ? baseIsEqual(srcValue, objValue, customizer, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG, stack)\n            : result\n          )) {\n        return false;\n      }\n    }\n  }\n  return true;\n}\n\nexport default baseIsMatch;\n","import isObject from './isObject';\n\n/**\n * Checks if `value` is suitable for strict equality comparisons, i.e. `===`.\n *\n * @private\n * @param {*} value The value to check.\n * @returns {boolean} Returns `true` if `value` if suitable for strict\n *  equality comparisons, else `false`.\n */\nfunction isStrictComparable(value) {\n  return value === value && !isObject(value);\n}\n\nexport default isStrictComparable;\n","import arrayMap from './_arrayMap';\n\n/**\n * The base implementation of `_.toPairs` and `_.toPairsIn` which creates an array\n * of key-value pairs for `object` corresponding to the property names of `props`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} props The property names to get values for.\n * @returns {Object} Returns the key-value pairs.\n */\nfunction baseToPairs(object, props) {\n  return arrayMap(props, function(key) {\n    return [key, object[key]];\n  });\n}\n\nexport default baseToPairs;\n","/**\n * Converts `set` to its value-value pairs.\n *\n * @private\n * @param {Object} set The set to convert.\n * @returns {Array} Returns the value-value pairs.\n */\nfunction setToPairs(set) {\n  var index = -1,\n      result = Array(set.size);\n\n  set.forEach(function(value) {\n    result[++index] = [value, value];\n  });\n  return result;\n}\n\nexport default setToPairs;\n","import baseToPairs from './_baseToPairs';\nimport getTag from './_getTag';\nimport mapToArray from './_mapToArray';\nimport setToPairs from './_setToPairs';\n\n/** `Object#toString` result references. */\nvar mapTag = '[object Map]',\n    setTag = '[object Set]';\n\n/**\n * Creates a `_.toPairs` or `_.toPairsIn` function.\n *\n * @private\n * @param {Function} keysFunc The function to get the keys of a given object.\n * @returns {Function} Returns the new pairs function.\n */\nfunction createToPairs(keysFunc) {\n  return function(object) {\n    var tag = getTag(object);\n    if (tag == mapTag) {\n      return mapToArray(object);\n    }\n    if (tag == setTag) {\n      return setToPairs(object);\n    }\n    return baseToPairs(object, keysFunc(object));\n  };\n}\n\nexport default createToPairs;\n","import createToPairs from './_createToPairs';\nimport keys from './keys';\n\n/**\n * Creates an array of own enumerable string keyed-value pairs for `object`\n * which can be consumed by `_.fromPairs`. If `object` is a map or set, its\n * entries are returned.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @alias entries\n * @category Object\n * @param {Object} object The object to query.\n * @returns {Array} Returns the key-value pairs.\n * @example\n *\n * function Foo() {\n *   this.a = 1;\n *   this.b = 2;\n * }\n *\n * Foo.prototype.c = 3;\n *\n * _.toPairs(new Foo);\n * // => [['a', 1], ['b', 2]] (iteration order is not guaranteed)\n */\nvar toPairs = createToPairs(keys);\n\nexport default toPairs;\n","import isStrictComparable from './_isStrictComparable';\nimport toPairs from './toPairs';\n\n/**\n * Gets the property names, values, and compare flags of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @returns {Array} Returns the match data of `object`.\n */\nfunction getMatchData(object) {\n  var result = toPairs(object),\n      length = result.length;\n\n  while (length--) {\n    result[length][2] = isStrictComparable(result[length][1]);\n  }\n  return result;\n}\n\nexport default getMatchData;\n","/**\n * A specialized version of `matchesProperty` for source values suitable\n * for strict equality comparisons, i.e. `===`.\n *\n * @private\n * @param {string} key The key of the property to get.\n * @param {*} srcValue The value to match.\n * @returns {Function} Returns the new spec function.\n */\nfunction matchesStrictComparable(key, srcValue) {\n  return function(object) {\n    if (object == null) {\n      return false;\n    }\n    return object[key] === srcValue &&\n      (srcValue !== undefined || (key in Object(object)));\n  };\n}\n\nexport default matchesStrictComparable;\n","import baseIsMatch from './_baseIsMatch';\nimport getMatchData from './_getMatchData';\nimport matchesStrictComparable from './_matchesStrictComparable';\n\n/**\n * The base implementation of `_.matches` which doesn't clone `source`.\n *\n * @private\n * @param {Object} source The object of property values to match.\n * @returns {Function} Returns the new spec function.\n */\nfunction baseMatches(source) {\n  var matchData = getMatchData(source);\n  if (matchData.length == 1 && matchData[0][2]) {\n    return matchesStrictComparable(matchData[0][0], matchData[0][1]);\n  }\n  return function(object) {\n    return object === source || baseIsMatch(object, source, matchData);\n  };\n}\n\nexport default baseMatches;\n","import MapCache from './_MapCache';\n\n/** Used as the `TypeError` message for \"Functions\" methods. */\nvar FUNC_ERROR_TEXT = 'Expected a function';\n\n/**\n * Creates a function that memoizes the result of `func`. If `resolver` is\n * provided, it determines the cache key for storing the result based on the\n * arguments provided to the memoized function. By default, the first argument\n * provided to the memoized function is used as the map cache key. The `func`\n * is invoked with the `this` binding of the memoized function.\n *\n * **Note:** The cache is exposed as the `cache` property on the memoized\n * function. Its creation may be customized by replacing the `_.memoize.Cache`\n * constructor with one whose instances implement the\n * [`Map`](http://ecma-international.org/ecma-262/6.0/#sec-properties-of-the-map-prototype-object)\n * method interface of `delete`, `get`, `has`, and `set`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Function\n * @param {Function} func The function to have its output memoized.\n * @param {Function} [resolver] The function to resolve the cache key.\n * @returns {Function} Returns the new memoized function.\n * @example\n *\n * var object = { 'a': 1, 'b': 2 };\n * var other = { 'c': 3, 'd': 4 };\n *\n * var values = _.memoize(_.values);\n * values(object);\n * // => [1, 2]\n *\n * values(other);\n * // => [3, 4]\n *\n * object.a = 2;\n * values(object);\n * // => [1, 2]\n *\n * // Modify the result cache.\n * values.cache.set(object, ['a', 'b']);\n * values(object);\n * // => ['a', 'b']\n *\n * // Replace `_.memoize.Cache`.\n * _.memoize.Cache = WeakMap;\n */\nfunction memoize(func, resolver) {\n  if (typeof func != 'function' || (resolver && typeof resolver != 'function')) {\n    throw new TypeError(FUNC_ERROR_TEXT);\n  }\n  var memoized = function() {\n    var args = arguments,\n        key = resolver ? resolver.apply(this, args) : args[0],\n        cache = memoized.cache;\n\n    if (cache.has(key)) {\n      return cache.get(key);\n    }\n    var result = func.apply(this, args);\n    memoized.cache = cache.set(key, result);\n    return result;\n  };\n  memoized.cache = new (memoize.Cache || MapCache);\n  return memoized;\n}\n\n// Assign cache to `_.memoize`.\nmemoize.Cache = MapCache;\n\nexport default memoize;\n","import Symbol from './_Symbol';\nimport isSymbol from './isSymbol';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/** Used to convert symbols to primitives and strings. */\nvar symbolProto = Symbol ? Symbol.prototype : undefined,\n    symbolToString = symbolProto ? symbolProto.toString : undefined;\n\n/**\n * The base implementation of `_.toString` which doesn't convert nullish\n * values to empty strings.\n *\n * @private\n * @param {*} value The value to process.\n * @returns {string} Returns the string.\n */\nfunction baseToString(value) {\n  // Exit early for strings to avoid a performance hit in some environments.\n  if (typeof value == 'string') {\n    return value;\n  }\n  if (isSymbol(value)) {\n    return symbolToString ? symbolToString.call(value) : '';\n  }\n  var result = (value + '');\n  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n}\n\nexport default baseToString;\n","import baseToString from './_baseToString';\n\n/**\n * Converts `value` to a string. An empty string is returned for `null`\n * and `undefined` values. The sign of `-0` is preserved.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to process.\n * @returns {string} Returns the string.\n * @example\n *\n * _.toString(null);\n * // => ''\n *\n * _.toString(-0);\n * // => '-0'\n *\n * _.toString([1, 2, 3]);\n * // => '1,2,3'\n */\nfunction toString(value) {\n  return value == null ? '' : baseToString(value);\n}\n\nexport default toString;\n","import memoize from './memoize';\nimport toString from './toString';\n\n/** Used to match property names within property paths. */\nvar rePropName = /[^.[\\]]+|\\[(?:(-?\\d+(?:\\.\\d+)?)|([\"'])((?:(?!\\2)[^\\\\]|\\\\.)*?)\\2)\\]/g;\n\n/** Used to match backslashes in property paths. */\nvar reEscapeChar = /\\\\(\\\\)?/g;\n\n/**\n * Converts `string` to a property path array.\n *\n * @private\n * @param {string} string The string to convert.\n * @returns {Array} Returns the property path array.\n */\nvar stringToPath = memoize(function(string) {\n  var result = [];\n  toString(string).replace(rePropName, function(match, number, quote, string) {\n    result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));\n  });\n  return result;\n});\n\nexport default stringToPath;\n","import isArray from './isArray';\nimport stringToPath from './_stringToPath';\n\n/**\n * Casts `value` to a path array if it's not one.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {Array} Returns the cast property path array.\n */\nfunction castPath(value) {\n  return isArray(value) ? value : stringToPath(value);\n}\n\nexport default castPath;\n","import isArray from './isArray';\nimport isSymbol from './isSymbol';\n\n/** Used to match property names within property paths. */\nvar reIsDeepProp = /\\.|\\[(?:[^[\\]]*|([\"'])(?:(?!\\1)[^\\\\]|\\\\.)*?\\1)\\]/,\n    reIsPlainProp = /^\\w*$/;\n\n/**\n * Checks if `value` is a property name and not a property path.\n *\n * @private\n * @param {*} value The value to check.\n * @param {Object} [object] The object to query keys on.\n * @returns {boolean} Returns `true` if `value` is a property name, else `false`.\n */\nfunction isKey(value, object) {\n  if (isArray(value)) {\n    return false;\n  }\n  var type = typeof value;\n  if (type == 'number' || type == 'symbol' || type == 'boolean' ||\n      value == null || isSymbol(value)) {\n    return true;\n  }\n  return reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||\n    (object != null && value in Object(object));\n}\n\nexport default isKey;\n","import isSymbol from './isSymbol';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/**\n * Converts `value` to a string key if it's not a string or symbol.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {string|symbol} Returns the key.\n */\nfunction toKey(value) {\n  if (typeof value == 'string' || isSymbol(value)) {\n    return value;\n  }\n  var result = (value + '');\n  return (result == '0' && (1 / value) == -INFINITY) ? '-0' : result;\n}\n\nexport default toKey;\n","import castPath from './_castPath';\nimport isKey from './_isKey';\nimport toKey from './_toKey';\n\n/**\n * The base implementation of `_.get` without support for default values.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @returns {*} Returns the resolved value.\n */\nfunction baseGet(object, path) {\n  path = isKey(path, object) ? [path] : castPath(path);\n\n  var index = 0,\n      length = path.length;\n\n  while (object != null && index < length) {\n    object = object[toKey(path[index++])];\n  }\n  return (index && index == length) ? object : undefined;\n}\n\nexport default baseGet;\n","import baseGet from './_baseGet';\n\n/**\n * Gets the value at `path` of `object`. If the resolved value is\n * `undefined`, the `defaultValue` is used in its place.\n *\n * @static\n * @memberOf _\n * @since 3.7.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to get.\n * @param {*} [defaultValue] The value returned for `undefined` resolved values.\n * @returns {*} Returns the resolved value.\n * @example\n *\n * var object = { 'a': [{ 'b': { 'c': 3 } }] };\n *\n * _.get(object, 'a[0].b.c');\n * // => 3\n *\n * _.get(object, ['a', '0', 'b', 'c']);\n * // => 3\n *\n * _.get(object, 'a.b.c', 'default');\n * // => 'default'\n */\nfunction get(object, path, defaultValue) {\n  var result = object == null ? undefined : baseGet(object, path);\n  return result === undefined ? defaultValue : result;\n}\n\nexport default get;\n","/**\n * The base implementation of `_.hasIn` without support for deep paths.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} key The key to check.\n * @returns {boolean} Returns `true` if `key` exists, else `false`.\n */\nfunction baseHasIn(object, key) {\n  return key in Object(object);\n}\n\nexport default baseHasIn;\n","import castPath from './_castPath';\nimport isArguments from './isArguments';\nimport isArray from './isArray';\nimport isIndex from './_isIndex';\nimport isKey from './_isKey';\nimport isLength from './isLength';\nimport isString from './isString';\nimport toKey from './_toKey';\n\n/**\n * Checks if `path` exists on `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @param {Function} hasFunc The function to check properties.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n */\nfunction hasPath(object, path, hasFunc) {\n  path = isKey(path, object) ? [path] : castPath(path);\n\n  var result,\n      index = -1,\n      length = path.length;\n\n  while (++index < length) {\n    var key = toKey(path[index]);\n    if (!(result = object != null && hasFunc(object, key))) {\n      break;\n    }\n    object = object[key];\n  }\n  if (result) {\n    return result;\n  }\n  var length = object ? object.length : 0;\n  return !!length && isLength(length) && isIndex(key, length) &&\n    (isArray(object) || isString(object) || isArguments(object));\n}\n\nexport default hasPath;\n","import baseHasIn from './_baseHasIn';\nimport hasPath from './_hasPath';\n\n/**\n * Checks if `path` is a direct or inherited property of `object`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Object\n * @param {Object} object The object to query.\n * @param {Array|string} path The path to check.\n * @returns {boolean} Returns `true` if `path` exists, else `false`.\n * @example\n *\n * var object = _.create({ 'a': _.create({ 'b': 2 }) });\n *\n * _.hasIn(object, 'a');\n * // => true\n *\n * _.hasIn(object, 'a.b');\n * // => true\n *\n * _.hasIn(object, ['a', 'b']);\n * // => true\n *\n * _.hasIn(object, 'b');\n * // => false\n */\nfunction hasIn(object, path) {\n  return object != null && hasPath(object, path, baseHasIn);\n}\n\nexport default hasIn;\n","import baseIsEqual from './_baseIsEqual';\nimport get from './get';\nimport hasIn from './hasIn';\nimport isKey from './_isKey';\nimport isStrictComparable from './_isStrictComparable';\nimport matchesStrictComparable from './_matchesStrictComparable';\nimport toKey from './_toKey';\n\n/** Used to compose bitmasks for comparison styles. */\nvar UNORDERED_COMPARE_FLAG = 1,\n    PARTIAL_COMPARE_FLAG = 2;\n\n/**\n * The base implementation of `_.matchesProperty` which doesn't clone `srcValue`.\n *\n * @private\n * @param {string} path The path of the property to get.\n * @param {*} srcValue The value to match.\n * @returns {Function} Returns the new spec function.\n */\nfunction baseMatchesProperty(path, srcValue) {\n  if (isKey(path) && isStrictComparable(srcValue)) {\n    return matchesStrictComparable(toKey(path), srcValue);\n  }\n  return function(object) {\n    var objValue = get(object, path);\n    return (objValue === undefined && objValue === srcValue)\n      ? hasIn(object, path)\n      : baseIsEqual(srcValue, objValue, undefined, UNORDERED_COMPARE_FLAG | PARTIAL_COMPARE_FLAG);\n  };\n}\n\nexport default baseMatchesProperty;\n","/**\n * This method returns the first argument given to it.\n *\n * @static\n * @since 0.1.0\n * @memberOf _\n * @category Util\n * @param {*} value Any value.\n * @returns {*} Returns `value`.\n * @example\n *\n * var object = { 'user': 'fred' };\n *\n * _.identity(object) === object;\n * // => true\n */\nfunction identity(value) {\n  return value;\n}\n\nexport default identity;\n","import baseGet from './_baseGet';\n\n/**\n * A specialized version of `baseProperty` which supports deep paths.\n *\n * @private\n * @param {Array|string} path The path of the property to get.\n * @returns {Function} Returns the new accessor function.\n */\nfunction basePropertyDeep(path) {\n  return function(object) {\n    return baseGet(object, path);\n  };\n}\n\nexport default basePropertyDeep;\n","import baseProperty from './_baseProperty';\nimport basePropertyDeep from './_basePropertyDeep';\nimport isKey from './_isKey';\nimport toKey from './_toKey';\n\n/**\n * Creates a function that returns the value at `path` of a given object.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Util\n * @param {Array|string} path The path of the property to get.\n * @returns {Function} Returns the new accessor function.\n * @example\n *\n * var objects = [\n *   { 'a': { 'b': 2 } },\n *   { 'a': { 'b': 1 } }\n * ];\n *\n * _.map(objects, _.property('a.b'));\n * // => [2, 1]\n *\n * _.map(_.sortBy(objects, _.property(['a', 'b'])), 'a.b');\n * // => [1, 2]\n */\nfunction property(path) {\n  return isKey(path) ? baseProperty(toKey(path)) : basePropertyDeep(path);\n}\n\nexport default property;\n","import baseMatches from './_baseMatches';\nimport baseMatchesProperty from './_baseMatchesProperty';\nimport identity from './identity';\nimport isArray from './isArray';\nimport property from './property';\n\n/**\n * The base implementation of `_.iteratee`.\n *\n * @private\n * @param {*} [value=_.identity] The value to convert to an iteratee.\n * @returns {Function} Returns the iteratee.\n */\nfunction baseIteratee(value) {\n  // Don't store the `typeof` result in a variable to avoid a JIT bug in Safari 9.\n  // See https://bugs.webkit.org/show_bug.cgi?id=156034 for more details.\n  if (typeof value == 'function') {\n    return value;\n  }\n  if (value == null) {\n    return identity;\n  }\n  if (typeof value == 'object') {\n    return isArray(value)\n      ? baseMatchesProperty(value[0], value[1])\n      : baseMatches(value);\n  }\n  return property(value);\n}\n\nexport default baseIteratee;\n","import baseDifference from './_baseDifference';\nimport baseFlatten from './_baseFlatten';\nimport baseIteratee from './_baseIteratee';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.difference` except that it accepts `iteratee` which\n * is invoked for each element of `array` and `values` to generate the criterion\n * by which they're compared. Result values are chosen from the first array.\n * The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.differenceBy([3.1, 2.2, 1.3], [4.4, 2.5], Math.floor);\n * // => [3.1, 1.3]\n *\n * // The `_.property` iteratee shorthand.\n * _.differenceBy([{ 'x': 2 }, { 'x': 1 }], [{ 'x': 1 }], 'x');\n * // => [{ 'x': 2 }]\n */\nvar differenceBy = rest(function(array, values) {\n  var iteratee = last(values);\n  if (isArrayLikeObject(iteratee)) {\n    iteratee = undefined;\n  }\n  return isArrayLikeObject(array)\n    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), baseIteratee(iteratee))\n    : [];\n});\n\nexport default differenceBy;\n","import baseDifference from './_baseDifference';\nimport baseFlatten from './_baseFlatten';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.difference` except that it accepts `comparator`\n * which is invoked to compare elements of `array` to `values`. Result values\n * are chosen from the first array. The comparator is invoked with two arguments:\n * (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...Array} [values] The values to exclude.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n *\n * _.differenceWith(objects, [{ 'x': 1, 'y': 2 }], _.isEqual);\n * // => [{ 'x': 2, 'y': 1 }]\n */\nvar differenceWith = rest(function(array, values) {\n  var comparator = last(values);\n  if (isArrayLikeObject(comparator)) {\n    comparator = undefined;\n  }\n  return isArrayLikeObject(array)\n    ? baseDifference(array, baseFlatten(values, 1, isArrayLikeObject, true), undefined, comparator)\n    : [];\n});\n\nexport default differenceWith;\n","import baseSlice from './_baseSlice';\nimport toInteger from './toInteger';\n\n/**\n * Creates a slice of `array` with `n` elements dropped from the beginning.\n *\n * @static\n * @memberOf _\n * @since 0.5.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to drop.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.drop([1, 2, 3]);\n * // => [2, 3]\n *\n * _.drop([1, 2, 3], 2);\n * // => [3]\n *\n * _.drop([1, 2, 3], 5);\n * // => []\n *\n * _.drop([1, 2, 3], 0);\n * // => [1, 2, 3]\n */\nfunction drop(array, n, guard) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  n = (guard || n === undefined) ? 1 : toInteger(n);\n  return baseSlice(array, n < 0 ? 0 : n, length);\n}\n\nexport default drop;\n","import baseSlice from './_baseSlice';\nimport toInteger from './toInteger';\n\n/**\n * Creates a slice of `array` with `n` elements dropped from the end.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to drop.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.dropRight([1, 2, 3]);\n * // => [1, 2]\n *\n * _.dropRight([1, 2, 3], 2);\n * // => [1]\n *\n * _.dropRight([1, 2, 3], 5);\n * // => []\n *\n * _.dropRight([1, 2, 3], 0);\n * // => [1, 2, 3]\n */\nfunction dropRight(array, n, guard) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  n = (guard || n === undefined) ? 1 : toInteger(n);\n  n = length - n;\n  return baseSlice(array, 0, n < 0 ? 0 : n);\n}\n\nexport default dropRight;\n","import baseSlice from './_baseSlice';\n\n/**\n * The base implementation of methods like `_.dropWhile` and `_.takeWhile`\n * without support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to query.\n * @param {Function} predicate The function invoked per iteration.\n * @param {boolean} [isDrop] Specify dropping elements instead of taking them.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {Array} Returns the slice of `array`.\n */\nfunction baseWhile(array, predicate, isDrop, fromRight) {\n  var length = array.length,\n      index = fromRight ? length : -1;\n\n  while ((fromRight ? index-- : ++index < length) &&\n    predicate(array[index], index, array)) {}\n\n  return isDrop\n    ? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))\n    : baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));\n}\n\nexport default baseWhile;\n","import baseIteratee from './_baseIteratee';\nimport baseWhile from './_baseWhile';\n\n/**\n * Creates a slice of `array` excluding elements dropped from the end.\n * Elements are dropped until `predicate` returns falsey. The predicate is\n * invoked with three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': true },\n *   { 'user': 'fred',    'active': false },\n *   { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.dropRightWhile(users, function(o) { return !o.active; });\n * // => objects for ['barney']\n *\n * // The `_.matches` iteratee shorthand.\n * _.dropRightWhile(users, { 'user': 'pebbles', 'active': false });\n * // => objects for ['barney', 'fred']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.dropRightWhile(users, ['active', false]);\n * // => objects for ['barney']\n *\n * // The `_.property` iteratee shorthand.\n * _.dropRightWhile(users, 'active');\n * // => objects for ['barney', 'fred', 'pebbles']\n */\nfunction dropRightWhile(array, predicate) {\n  return (array && array.length)\n    ? baseWhile(array, baseIteratee(predicate, 3), true, true)\n    : [];\n}\n\nexport default dropRightWhile;\n","import baseIteratee from './_baseIteratee';\nimport baseWhile from './_baseWhile';\n\n/**\n * Creates a slice of `array` excluding elements dropped from the beginning.\n * Elements are dropped until `predicate` returns falsey. The predicate is\n * invoked with three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': false },\n *   { 'user': 'fred',    'active': false },\n *   { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.dropWhile(users, function(o) { return !o.active; });\n * // => objects for ['pebbles']\n *\n * // The `_.matches` iteratee shorthand.\n * _.dropWhile(users, { 'user': 'barney', 'active': false });\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.dropWhile(users, ['active', false]);\n * // => objects for ['pebbles']\n *\n * // The `_.property` iteratee shorthand.\n * _.dropWhile(users, 'active');\n * // => objects for ['barney', 'fred', 'pebbles']\n */\nfunction dropWhile(array, predicate) {\n  return (array && array.length)\n    ? baseWhile(array, baseIteratee(predicate, 3), true)\n    : [];\n}\n\nexport default dropWhile;\n","/**\n * The base implementation of `_.clamp` which doesn't coerce arguments to numbers.\n *\n * @private\n * @param {number} number The number to clamp.\n * @param {number} [lower] The lower bound.\n * @param {number} upper The upper bound.\n * @returns {number} Returns the clamped number.\n */\nfunction baseClamp(number, lower, upper) {\n  if (number === number) {\n    if (upper !== undefined) {\n      number = number <= upper ? number : upper;\n    }\n    if (lower !== undefined) {\n      number = number >= lower ? number : lower;\n    }\n  }\n  return number;\n}\n\nexport default baseClamp;\n","import baseClamp from './_baseClamp';\nimport toInteger from './toInteger';\n\n/** Used as references for the maximum length and index of an array. */\nvar MAX_ARRAY_LENGTH = 4294967295;\n\n/**\n * Converts `value` to an integer suitable for use as the length of an\n * array-like object.\n *\n * **Note:** This method is based on\n * [`ToLength`](http://ecma-international.org/ecma-262/6.0/#sec-tolength).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to convert.\n * @returns {number} Returns the converted integer.\n * @example\n *\n * _.toLength(3.2);\n * // => 3\n *\n * _.toLength(Number.MIN_VALUE);\n * // => 0\n *\n * _.toLength(Infinity);\n * // => 4294967295\n *\n * _.toLength('3.2');\n * // => 3\n */\nfunction toLength(value) {\n  return value ? baseClamp(toInteger(value), 0, MAX_ARRAY_LENGTH) : 0;\n}\n\nexport default toLength;\n","import toInteger from './toInteger';\nimport toLength from './toLength';\n\n/**\n * The base implementation of `_.fill` without an iteratee call guard.\n *\n * @private\n * @param {Array} array The array to fill.\n * @param {*} value The value to fill `array` with.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns `array`.\n */\nfunction baseFill(array, value, start, end) {\n  var length = array.length;\n\n  start = toInteger(start);\n  if (start < 0) {\n    start = -start > length ? 0 : (length + start);\n  }\n  end = (end === undefined || end > length) ? length : toInteger(end);\n  if (end < 0) {\n    end += length;\n  }\n  end = start > end ? 0 : toLength(end);\n  while (start < end) {\n    array[start++] = value;\n  }\n  return array;\n}\n\nexport default baseFill;\n","import baseFill from './_baseFill';\nimport isIterateeCall from './_isIterateeCall';\n\n/**\n * Fills elements of `array` with `value` from `start` up to, but not\n * including, `end`.\n *\n * **Note:** This method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 3.2.0\n * @category Array\n * @param {Array} array The array to fill.\n * @param {*} value The value to fill `array` with.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3];\n *\n * _.fill(array, 'a');\n * console.log(array);\n * // => ['a', 'a', 'a']\n *\n * _.fill(Array(3), 2);\n * // => [2, 2, 2]\n *\n * _.fill([4, 6, 8, 10], '*', 1, 3);\n * // => [4, '*', '*', 10]\n */\nfunction fill(array, value, start, end) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  if (start && typeof start != 'number' && isIterateeCall(array, value, start)) {\n    start = 0;\n    end = length;\n  }\n  return baseFill(array, value, start, end);\n}\n\nexport default fill;\n","/**\n * The base implementation of `_.findIndex` and `_.findLastIndex` without\n * support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {Function} predicate The function invoked per iteration.\n * @param {boolean} [fromRight] Specify iterating from right to left.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction baseFindIndex(array, predicate, fromRight) {\n  var length = array.length,\n      index = fromRight ? length : -1;\n\n  while ((fromRight ? index-- : ++index < length)) {\n    if (predicate(array[index], index, array)) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default baseFindIndex;\n","import baseFindIndex from './_baseFindIndex';\nimport baseIteratee from './_baseIteratee';\n\n/**\n * This method is like `_.find` except that it returns the index of the first\n * element `predicate` returns truthy for instead of the element itself.\n *\n * @static\n * @memberOf _\n * @since 1.1.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {number} Returns the index of the found element, else `-1`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': false },\n *   { 'user': 'fred',    'active': false },\n *   { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.findIndex(users, function(o) { return o.user == 'barney'; });\n * // => 0\n *\n * // The `_.matches` iteratee shorthand.\n * _.findIndex(users, { 'user': 'fred', 'active': false });\n * // => 1\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findIndex(users, ['active', false]);\n * // => 0\n *\n * // The `_.property` iteratee shorthand.\n * _.findIndex(users, 'active');\n * // => 2\n */\nfunction findIndex(array, predicate) {\n  return (array && array.length)\n    ? baseFindIndex(array, baseIteratee(predicate, 3))\n    : -1;\n}\n\nexport default findIndex;\n","import baseFindIndex from './_baseFindIndex';\nimport baseIteratee from './_baseIteratee';\n\n/**\n * This method is like `_.findIndex` except that it iterates over elements\n * of `collection` from right to left.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {number} Returns the index of the found element, else `-1`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': true },\n *   { 'user': 'fred',    'active': false },\n *   { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.findLastIndex(users, function(o) { return o.user == 'pebbles'; });\n * // => 2\n *\n * // The `_.matches` iteratee shorthand.\n * _.findLastIndex(users, { 'user': 'barney', 'active': true });\n * // => 0\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.findLastIndex(users, ['active', false]);\n * // => 2\n *\n * // The `_.property` iteratee shorthand.\n * _.findLastIndex(users, 'active');\n * // => 0\n */\nfunction findLastIndex(array, predicate) {\n  return (array && array.length)\n    ? baseFindIndex(array, baseIteratee(predicate, 3), true)\n    : -1;\n}\n\nexport default findLastIndex;\n","/**\n * Gets the first element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @alias first\n * @category Array\n * @param {Array} array The array to query.\n * @returns {*} Returns the first element of `array`.\n * @example\n *\n * _.head([1, 2, 3]);\n * // => 1\n *\n * _.head([]);\n * // => undefined\n */\nfunction head(array) {\n  return (array && array.length) ? array[0] : undefined;\n}\n\nexport default head;\n","import baseFlatten from './_baseFlatten';\n\n/**\n * Flattens `array` a single level deep.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * _.flatten([1, [2, [3, [4]], 5]]);\n * // => [1, 2, [3, [4]], 5]\n */\nfunction flatten(array) {\n  var length = array ? array.length : 0;\n  return length ? baseFlatten(array, 1) : [];\n}\n\nexport default flatten;\n","import baseFlatten from './_baseFlatten';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/**\n * Recursively flattens `array`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * _.flattenDeep([1, [2, [3, [4]], 5]]);\n * // => [1, 2, 3, 4, 5]\n */\nfunction flattenDeep(array) {\n  var length = array ? array.length : 0;\n  return length ? baseFlatten(array, INFINITY) : [];\n}\n\nexport default flattenDeep;\n","import baseFlatten from './_baseFlatten';\nimport toInteger from './toInteger';\n\n/**\n * Recursively flatten `array` up to `depth` times.\n *\n * @static\n * @memberOf _\n * @since 4.4.0\n * @category Array\n * @param {Array} array The array to flatten.\n * @param {number} [depth=1] The maximum recursion depth.\n * @returns {Array} Returns the new flattened array.\n * @example\n *\n * var array = [1, [2, [3, [4]], 5]];\n *\n * _.flattenDepth(array, 1);\n * // => [1, 2, [3, [4]], 5]\n *\n * _.flattenDepth(array, 2);\n * // => [1, 2, 3, [4], 5]\n */\nfunction flattenDepth(array, depth) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  depth = depth === undefined ? 1 : toInteger(depth);\n  return baseFlatten(array, depth);\n}\n\nexport default flattenDepth;\n","/**\n * The inverse of `_.toPairs`; this method returns an object composed\n * from key-value `pairs`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} pairs The key-value pairs.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.fromPairs([['fred', 30], ['barney', 40]]);\n * // => { 'fred': 30, 'barney': 40 }\n */\nfunction fromPairs(pairs) {\n  var index = -1,\n      length = pairs ? pairs.length : 0,\n      result = {};\n\n  while (++index < length) {\n    var pair = pairs[index];\n    result[pair[0]] = pair[1];\n  }\n  return result;\n}\n\nexport default fromPairs;\n","import baseIndexOf from './_baseIndexOf';\nimport toInteger from './toInteger';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * Gets the index at which the first occurrence of `value` is found in `array`\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons. If `fromIndex` is negative, it's used as the\n * offset from the end of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @param {number} [fromIndex=0] The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.indexOf([1, 2, 1, 2], 2);\n * // => 1\n *\n * // Search from the `fromIndex`.\n * _.indexOf([1, 2, 1, 2], 2, 2);\n * // => 3\n */\nfunction indexOf(array, value, fromIndex) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return -1;\n  }\n  fromIndex = toInteger(fromIndex);\n  if (fromIndex < 0) {\n    fromIndex = nativeMax(length + fromIndex, 0);\n  }\n  return baseIndexOf(array, value, fromIndex);\n}\n\nexport default indexOf;\n","import dropRight from './dropRight';\n\n/**\n * Gets all but the last element of `array`.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.initial([1, 2, 3]);\n * // => [1, 2]\n */\nfunction initial(array) {\n  return dropRight(array, 1);\n}\n\nexport default initial;\n","import SetCache from './_SetCache';\nimport arrayIncludes from './_arrayIncludes';\nimport arrayIncludesWith from './_arrayIncludesWith';\nimport arrayMap from './_arrayMap';\nimport baseUnary from './_baseUnary';\nimport cacheHas from './_cacheHas';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMin = Math.min;\n\n/**\n * The base implementation of methods like `_.intersection`, without support\n * for iteratee shorthands, that accepts an array of arrays to inspect.\n *\n * @private\n * @param {Array} arrays The arrays to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of shared values.\n */\nfunction baseIntersection(arrays, iteratee, comparator) {\n  var includes = comparator ? arrayIncludesWith : arrayIncludes,\n      length = arrays[0].length,\n      othLength = arrays.length,\n      othIndex = othLength,\n      caches = Array(othLength),\n      maxLength = Infinity,\n      result = [];\n\n  while (othIndex--) {\n    var array = arrays[othIndex];\n    if (othIndex && iteratee) {\n      array = arrayMap(array, baseUnary(iteratee));\n    }\n    maxLength = nativeMin(array.length, maxLength);\n    caches[othIndex] = !comparator && (iteratee || (length >= 120 && array.length >= 120))\n      ? new SetCache(othIndex && array)\n      : undefined;\n  }\n  array = arrays[0];\n\n  var index = -1,\n      seen = caches[0];\n\n  outer:\n  while (++index < length && result.length < maxLength) {\n    var value = array[index],\n        computed = iteratee ? iteratee(value) : value;\n\n    value = (comparator || value !== 0) ? value : 0;\n    if (!(seen\n          ? cacheHas(seen, computed)\n          : includes(result, computed, comparator)\n        )) {\n      othIndex = othLength;\n      while (--othIndex) {\n        var cache = caches[othIndex];\n        if (!(cache\n              ? cacheHas(cache, computed)\n              : includes(arrays[othIndex], computed, comparator))\n            ) {\n          continue outer;\n        }\n      }\n      if (seen) {\n        seen.push(computed);\n      }\n      result.push(value);\n    }\n  }\n  return result;\n}\n\nexport default baseIntersection;\n","import isArrayLikeObject from './isArrayLikeObject';\n\n/**\n * Casts `value` to an empty array if it's not an array like object.\n *\n * @private\n * @param {*} value The value to inspect.\n * @returns {Array|Object} Returns the cast array-like object.\n */\nfunction castArrayLikeObject(value) {\n  return isArrayLikeObject(value) ? value : [];\n}\n\nexport default castArrayLikeObject;\n","import arrayMap from './_arrayMap';\nimport baseIntersection from './_baseIntersection';\nimport castArrayLikeObject from './_castArrayLikeObject';\nimport rest from './rest';\n\n/**\n * Creates an array of unique values that are included in all given arrays\n * using [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons. The order of result values is determined by the\n * order they occur in the first array.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * _.intersection([2, 1], [4, 2], [1, 2]);\n * // => [2]\n */\nvar intersection = rest(function(arrays) {\n  var mapped = arrayMap(arrays, castArrayLikeObject);\n  return (mapped.length && mapped[0] === arrays[0])\n    ? baseIntersection(mapped)\n    : [];\n});\n\nexport default intersection;\n","import arrayMap from './_arrayMap';\nimport baseIntersection from './_baseIntersection';\nimport baseIteratee from './_baseIteratee';\nimport castArrayLikeObject from './_castArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.intersection` except that it accepts `iteratee`\n * which is invoked for each element of each `arrays` to generate the criterion\n * by which they're compared. Result values are chosen from the first array.\n * The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * _.intersectionBy([2.1, 1.2], [4.3, 2.4], Math.floor);\n * // => [2.1]\n *\n * // The `_.property` iteratee shorthand.\n * _.intersectionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }]\n */\nvar intersectionBy = rest(function(arrays) {\n  var iteratee = last(arrays),\n      mapped = arrayMap(arrays, castArrayLikeObject);\n\n  if (iteratee === last(mapped)) {\n    iteratee = undefined;\n  } else {\n    mapped.pop();\n  }\n  return (mapped.length && mapped[0] === arrays[0])\n    ? baseIntersection(mapped, baseIteratee(iteratee))\n    : [];\n});\n\nexport default intersectionBy;\n","import arrayMap from './_arrayMap';\nimport baseIntersection from './_baseIntersection';\nimport castArrayLikeObject from './_castArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.intersection` except that it accepts `comparator`\n * which is invoked to compare elements of `arrays`. Result values are chosen\n * from the first array. The comparator is invoked with two arguments:\n * (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of intersecting values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.intersectionWith(objects, others, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }]\n */\nvar intersectionWith = rest(function(arrays) {\n  var comparator = last(arrays),\n      mapped = arrayMap(arrays, castArrayLikeObject);\n\n  if (comparator === last(mapped)) {\n    comparator = undefined;\n  } else {\n    mapped.pop();\n  }\n  return (mapped.length && mapped[0] === arrays[0])\n    ? baseIntersection(mapped, undefined, comparator)\n    : [];\n});\n\nexport default intersectionWith;\n","/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeJoin = arrayProto.join;\n\n/**\n * Converts all elements in `array` into a string separated by `separator`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to convert.\n * @param {string} [separator=','] The element separator.\n * @returns {string} Returns the joined string.\n * @example\n *\n * _.join(['a', 'b', 'c'], '~');\n * // => 'a~b~c'\n */\nfunction join(array, separator) {\n  return array ? nativeJoin.call(array, separator) : '';\n}\n\nexport default join;\n","import indexOfNaN from './_indexOfNaN';\nimport toInteger from './toInteger';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max,\n    nativeMin = Math.min;\n\n/**\n * This method is like `_.indexOf` except that it iterates over elements of\n * `array` from right to left.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @param {number} [fromIndex=array.length-1] The index to search from.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.lastIndexOf([1, 2, 1, 2], 2);\n * // => 3\n *\n * // Search from the `fromIndex`.\n * _.lastIndexOf([1, 2, 1, 2], 2, 2);\n * // => 1\n */\nfunction lastIndexOf(array, value, fromIndex) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return -1;\n  }\n  var index = length;\n  if (fromIndex !== undefined) {\n    index = toInteger(fromIndex);\n    index = (\n      index < 0\n        ? nativeMax(length + index, 0)\n        : nativeMin(index, length - 1)\n    ) + 1;\n  }\n  if (value !== value) {\n    return indexOfNaN(array, index, true);\n  }\n  while (index--) {\n    if (array[index] === value) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default lastIndexOf;\n","import isIndex from './_isIndex';\n\n/**\n * The base implementation of `_.nth` which doesn't coerce `n` to an integer.\n *\n * @private\n * @param {Array} array The array to query.\n * @param {number} n The index of the element to return.\n * @returns {*} Returns the nth element of `array`.\n */\nfunction baseNth(array, n) {\n  var length = array.length;\n  if (!length) {\n    return;\n  }\n  n += n < 0 ? length : 0;\n  return isIndex(n, length) ? array[n] : undefined;\n}\n\nexport default baseNth;\n","import baseNth from './_baseNth';\nimport toInteger from './toInteger';\n\n/**\n * Gets the element at `n` index of `array`. If `n` is negative, the nth\n * element from the end is returned.\n *\n * @static\n * @memberOf _\n * @since 4.11.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=0] The index of the element to return.\n * @returns {*} Returns the nth element of `array`.\n * @example\n *\n * var array = ['a', 'b', 'c', 'd'];\n *\n * _.nth(array, 1);\n * // => 'b'\n *\n * _.nth(array, -2);\n * // => 'c';\n */\nfunction nth(array, n) {\n  return (array && array.length) ? baseNth(array, toInteger(n)) : undefined;\n}\n\nexport default nth;\n","/**\n * This function is like `baseIndexOf` except that it accepts a comparator.\n *\n * @private\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @param {number} fromIndex The index to search from.\n * @param {Function} comparator The comparator invoked per element.\n * @returns {number} Returns the index of the matched value, else `-1`.\n */\nfunction baseIndexOfWith(array, value, fromIndex, comparator) {\n  var index = fromIndex - 1,\n      length = array.length;\n\n  while (++index < length) {\n    if (comparator(array[index], value)) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default baseIndexOfWith;\n","import arrayMap from './_arrayMap';\nimport baseIndexOf from './_baseIndexOf';\nimport baseIndexOfWith from './_baseIndexOfWith';\nimport baseUnary from './_baseUnary';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * The base implementation of `_.pullAllBy` without support for iteratee\n * shorthands.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns `array`.\n */\nfunction basePullAll(array, values, iteratee, comparator) {\n  var indexOf = comparator ? baseIndexOfWith : baseIndexOf,\n      index = -1,\n      length = values.length,\n      seen = array;\n\n  if (iteratee) {\n    seen = arrayMap(array, baseUnary(iteratee));\n  }\n  while (++index < length) {\n    var fromIndex = 0,\n        value = values[index],\n        computed = iteratee ? iteratee(value) : value;\n\n    while ((fromIndex = indexOf(seen, computed, fromIndex, comparator)) > -1) {\n      if (seen !== array) {\n        splice.call(seen, fromIndex, 1);\n      }\n      splice.call(array, fromIndex, 1);\n    }\n  }\n  return array;\n}\n\nexport default basePullAll;\n","import basePullAll from './_basePullAll';\n\n/**\n * This method is like `_.pull` except that it accepts an array of values to remove.\n *\n * **Note:** Unlike `_.difference`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3, 1, 2, 3];\n *\n * _.pullAll(array, [2, 3]);\n * console.log(array);\n * // => [1, 1]\n */\nfunction pullAll(array, values) {\n  return (array && array.length && values && values.length)\n    ? basePullAll(array, values)\n    : array;\n}\n\nexport default pullAll;\n","import pullAll from './pullAll';\nimport rest from './rest';\n\n/**\n * Removes all given values from `array` using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * **Note:** Unlike `_.without`, this method mutates `array`. Use `_.remove`\n * to remove elements from an array by predicate.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {...*} [values] The values to remove.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3, 1, 2, 3];\n *\n * _.pull(array, 2, 3);\n * console.log(array);\n * // => [1, 1]\n */\nvar pull = rest(pullAll);\n\nexport default pull;\n","import baseIteratee from './_baseIteratee';\nimport basePullAll from './_basePullAll';\n\n/**\n * This method is like `_.pullAll` except that it accepts `iteratee` which is\n * invoked for each element of `array` and `values` to generate the criterion\n * by which they're compared. The iteratee is invoked with one argument: (value).\n *\n * **Note:** Unlike `_.differenceBy`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [{ 'x': 1 }, { 'x': 2 }, { 'x': 3 }, { 'x': 1 }];\n *\n * _.pullAllBy(array, [{ 'x': 1 }, { 'x': 3 }], 'x');\n * console.log(array);\n * // => [{ 'x': 2 }]\n */\nfunction pullAllBy(array, values, iteratee) {\n  return (array && array.length && values && values.length)\n    ? basePullAll(array, values, baseIteratee(iteratee))\n    : array;\n}\n\nexport default pullAllBy;\n","import basePullAll from './_basePullAll';\n\n/**\n * This method is like `_.pullAll` except that it accepts `comparator` which\n * is invoked to compare elements of `array` to `values`. The comparator is\n * invoked with two arguments: (arrVal, othVal).\n *\n * **Note:** Unlike `_.differenceWith`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 4.6.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array} values The values to remove.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [{ 'x': 1, 'y': 2 }, { 'x': 3, 'y': 4 }, { 'x': 5, 'y': 6 }];\n *\n * _.pullAllWith(array, [{ 'x': 3, 'y': 4 }], _.isEqual);\n * console.log(array);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 5, 'y': 6 }]\n */\nfunction pullAllWith(array, values, comparator) {\n  return (array && array.length && values && values.length)\n    ? basePullAll(array, values, undefined, comparator)\n    : array;\n}\n\nexport default pullAllWith;\n","import get from './get';\n\n/**\n * The base implementation of `_.at` without support for individual paths.\n *\n * @private\n * @param {Object} object The object to iterate over.\n * @param {string[]} paths The property paths of elements to pick.\n * @returns {Array} Returns the picked elements.\n */\nfunction baseAt(object, paths) {\n  var index = -1,\n      isNil = object == null,\n      length = paths.length,\n      result = Array(length);\n\n  while (++index < length) {\n    result[index] = isNil ? undefined : get(object, paths[index]);\n  }\n  return result;\n}\n\nexport default baseAt;\n","import baseGet from './_baseGet';\nimport baseSlice from './_baseSlice';\n\n/**\n * Gets the parent value at `path` of `object`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array} path The path to get the parent value of.\n * @returns {*} Returns the parent value.\n */\nfunction parent(object, path) {\n  return path.length == 1 ? object : baseGet(object, baseSlice(path, 0, -1));\n}\n\nexport default parent;\n","import castPath from './_castPath';\nimport isIndex from './_isIndex';\nimport isKey from './_isKey';\nimport last from './last';\nimport parent from './_parent';\nimport toKey from './_toKey';\n\n/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/** Built-in value references. */\nvar splice = arrayProto.splice;\n\n/**\n * The base implementation of `_.pullAt` without support for individual\n * indexes or capturing the removed elements.\n *\n * @private\n * @param {Array} array The array to modify.\n * @param {number[]} indexes The indexes of elements to remove.\n * @returns {Array} Returns `array`.\n */\nfunction basePullAt(array, indexes) {\n  var length = array ? indexes.length : 0,\n      lastIndex = length - 1;\n\n  while (length--) {\n    var index = indexes[length];\n    if (length == lastIndex || index !== previous) {\n      var previous = index;\n      if (isIndex(index)) {\n        splice.call(array, index, 1);\n      }\n      else if (!isKey(index, array)) {\n        var path = castPath(index),\n            object = parent(array, path);\n\n        if (object != null) {\n          delete object[toKey(last(path))];\n        }\n      }\n      else {\n        delete array[toKey(index)];\n      }\n    }\n  }\n  return array;\n}\n\nexport default basePullAt;\n","import isSymbol from './isSymbol';\n\n/**\n * Compares values to sort them in ascending order.\n *\n * @private\n * @param {*} value The value to compare.\n * @param {*} other The other value to compare.\n * @returns {number} Returns the sort order indicator for `value`.\n */\nfunction compareAscending(value, other) {\n  if (value !== other) {\n    var valIsDefined = value !== undefined,\n        valIsNull = value === null,\n        valIsReflexive = value === value,\n        valIsSymbol = isSymbol(value);\n\n    var othIsDefined = other !== undefined,\n        othIsNull = other === null,\n        othIsReflexive = other === other,\n        othIsSymbol = isSymbol(other);\n\n    if ((!othIsNull && !othIsSymbol && !valIsSymbol && value > other) ||\n        (valIsSymbol && othIsDefined && othIsReflexive && !othIsNull && !othIsSymbol) ||\n        (valIsNull && othIsDefined && othIsReflexive) ||\n        (!valIsDefined && othIsReflexive) ||\n        !valIsReflexive) {\n      return 1;\n    }\n    if ((!valIsNull && !valIsSymbol && !othIsSymbol && value < other) ||\n        (othIsSymbol && valIsDefined && valIsReflexive && !valIsNull && !valIsSymbol) ||\n        (othIsNull && valIsDefined && valIsReflexive) ||\n        (!othIsDefined && valIsReflexive) ||\n        !othIsReflexive) {\n      return -1;\n    }\n  }\n  return 0;\n}\n\nexport default compareAscending;\n","import arrayMap from './_arrayMap';\nimport baseAt from './_baseAt';\nimport baseFlatten from './_baseFlatten';\nimport basePullAt from './_basePullAt';\nimport compareAscending from './_compareAscending';\nimport isIndex from './_isIndex';\nimport rest from './rest';\n\n/**\n * Removes elements from `array` corresponding to `indexes` and returns an\n * array of removed elements.\n *\n * **Note:** Unlike `_.at`, this method mutates `array`.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {...(number|number[])} [indexes] The indexes of elements to remove.\n * @returns {Array} Returns the new array of removed elements.\n * @example\n *\n * var array = [5, 10, 15, 20];\n * var evens = _.pullAt(array, 1, 3);\n *\n * console.log(array);\n * // => [5, 15]\n *\n * console.log(evens);\n * // => [10, 20]\n */\nvar pullAt = rest(function(array, indexes) {\n  indexes = baseFlatten(indexes, 1);\n\n  var length = array ? array.length : 0,\n      result = baseAt(array, indexes);\n\n  basePullAt(array, arrayMap(indexes, function(index) {\n    return isIndex(index, length) ? +index : index;\n  }).sort(compareAscending));\n\n  return result;\n});\n\nexport default pullAt;\n","import baseIteratee from './_baseIteratee';\nimport basePullAt from './_basePullAt';\n\n/**\n * Removes all elements from `array` that `predicate` returns truthy for\n * and returns an array of the removed elements. The predicate is invoked\n * with three arguments: (value, index, array).\n *\n * **Note:** Unlike `_.filter`, this method mutates `array`. Use `_.pull`\n * to pull elements from an array by value.\n *\n * @static\n * @memberOf _\n * @since 2.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {Array} Returns the new array of removed elements.\n * @example\n *\n * var array = [1, 2, 3, 4];\n * var evens = _.remove(array, function(n) {\n *   return n % 2 == 0;\n * });\n *\n * console.log(array);\n * // => [1, 3]\n *\n * console.log(evens);\n * // => [2, 4]\n */\nfunction remove(array, predicate) {\n  var result = [];\n  if (!(array && array.length)) {\n    return result;\n  }\n  var index = -1,\n      indexes = [],\n      length = array.length;\n\n  predicate = baseIteratee(predicate, 3);\n  while (++index < length) {\n    var value = array[index];\n    if (predicate(value, index, array)) {\n      result.push(value);\n      indexes.push(index);\n    }\n  }\n  basePullAt(array, indexes);\n  return result;\n}\n\nexport default remove;\n","/** Used for built-in method references. */\nvar arrayProto = Array.prototype;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeReverse = arrayProto.reverse;\n\n/**\n * Reverses `array` so that the first element becomes the last, the second\n * element becomes the second to last, and so on.\n *\n * **Note:** This method mutates `array` and is based on\n * [`Array#reverse`](https://mdn.io/Array/reverse).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to modify.\n * @returns {Array} Returns `array`.\n * @example\n *\n * var array = [1, 2, 3];\n *\n * _.reverse(array);\n * // => [3, 2, 1]\n *\n * console.log(array);\n * // => [3, 2, 1]\n */\nfunction reverse(array) {\n  return array ? nativeReverse.call(array) : array;\n}\n\nexport default reverse;\n","import baseSlice from './_baseSlice';\nimport isIterateeCall from './_isIterateeCall';\nimport toInteger from './toInteger';\n\n/**\n * Creates a slice of `array` from `start` up to, but not including, `end`.\n *\n * **Note:** This method is used instead of\n * [`Array#slice`](https://mdn.io/Array/slice) to ensure dense arrays are\n * returned.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to slice.\n * @param {number} [start=0] The start position.\n * @param {number} [end=array.length] The end position.\n * @returns {Array} Returns the slice of `array`.\n */\nfunction slice(array, start, end) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  if (end && typeof end != 'number' && isIterateeCall(array, start, end)) {\n    start = 0;\n    end = length;\n  }\n  else {\n    start = start == null ? 0 : toInteger(start);\n    end = end === undefined ? length : toInteger(end);\n  }\n  return baseSlice(array, start, end);\n}\n\nexport default slice;\n","import isSymbol from './isSymbol';\n\n/** Used as references for the maximum length and index of an array. */\nvar MAX_ARRAY_LENGTH = 4294967295,\n    MAX_ARRAY_INDEX = MAX_ARRAY_LENGTH - 1;\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeFloor = Math.floor,\n    nativeMin = Math.min;\n\n/**\n * The base implementation of `_.sortedIndexBy` and `_.sortedLastIndexBy`\n * which invokes `iteratee` for `value` and each element of `array` to compute\n * their sort ranking. The iteratee is invoked with one argument; (value).\n *\n * @private\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Function} iteratee The iteratee invoked per element.\n * @param {boolean} [retHighest] Specify returning the highest qualified index.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n */\nfunction baseSortedIndexBy(array, value, iteratee, retHighest) {\n  value = iteratee(value);\n\n  var low = 0,\n      high = array ? array.length : 0,\n      valIsNaN = value !== value,\n      valIsNull = value === null,\n      valIsSymbol = isSymbol(value),\n      valIsUndefined = value === undefined;\n\n  while (low < high) {\n    var mid = nativeFloor((low + high) / 2),\n        computed = iteratee(array[mid]),\n        othIsDefined = computed !== undefined,\n        othIsNull = computed === null,\n        othIsReflexive = computed === computed,\n        othIsSymbol = isSymbol(computed);\n\n    if (valIsNaN) {\n      var setLow = retHighest || othIsReflexive;\n    } else if (valIsUndefined) {\n      setLow = othIsReflexive && (retHighest || othIsDefined);\n    } else if (valIsNull) {\n      setLow = othIsReflexive && othIsDefined && (retHighest || !othIsNull);\n    } else if (valIsSymbol) {\n      setLow = othIsReflexive && othIsDefined && !othIsNull && (retHighest || !othIsSymbol);\n    } else if (othIsNull || othIsSymbol) {\n      setLow = false;\n    } else {\n      setLow = retHighest ? (computed <= value) : (computed < value);\n    }\n    if (setLow) {\n      low = mid + 1;\n    } else {\n      high = mid;\n    }\n  }\n  return nativeMin(high, MAX_ARRAY_INDEX);\n}\n\nexport default baseSortedIndexBy;\n","import baseSortedIndexBy from './_baseSortedIndexBy';\nimport identity from './identity';\nimport isSymbol from './isSymbol';\n\n/** Used as references for the maximum length and index of an array. */\nvar MAX_ARRAY_LENGTH = 4294967295,\n    HALF_MAX_ARRAY_LENGTH = MAX_ARRAY_LENGTH >>> 1;\n\n/**\n * The base implementation of `_.sortedIndex` and `_.sortedLastIndex` which\n * performs a binary search of `array` to determine the index at which `value`\n * should be inserted into `array` in order to maintain its sort order.\n *\n * @private\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {boolean} [retHighest] Specify returning the highest qualified index.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n */\nfunction baseSortedIndex(array, value, retHighest) {\n  var low = 0,\n      high = array ? array.length : low;\n\n  if (typeof value == 'number' && value === value && high <= HALF_MAX_ARRAY_LENGTH) {\n    while (low < high) {\n      var mid = (low + high) >>> 1,\n          computed = array[mid];\n\n      if (computed !== null && !isSymbol(computed) &&\n          (retHighest ? (computed <= value) : (computed < value))) {\n        low = mid + 1;\n      } else {\n        high = mid;\n      }\n    }\n    return high;\n  }\n  return baseSortedIndexBy(array, value, identity, retHighest);\n}\n\nexport default baseSortedIndex;\n","import baseSortedIndex from './_baseSortedIndex';\n\n/**\n * Uses a binary search to determine the lowest index at which `value`\n * should be inserted into `array` in order to maintain its sort order.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n * @example\n *\n * _.sortedIndex([30, 50], 40);\n * // => 1\n *\n * _.sortedIndex([4, 5], 4);\n * // => 0\n */\nfunction sortedIndex(array, value) {\n  return baseSortedIndex(array, value);\n}\n\nexport default sortedIndex;\n","import baseIteratee from './_baseIteratee';\nimport baseSortedIndexBy from './_baseSortedIndexBy';\n\n/**\n * This method is like `_.sortedIndex` except that it accepts `iteratee`\n * which is invoked for `value` and each element of `array` to compute their\n * sort ranking. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n * @example\n *\n * var dict = { 'thirty': 30, 'forty': 40, 'fifty': 50 };\n *\n * _.sortedIndexBy(['thirty', 'fifty'], 'forty', _.propertyOf(dict));\n * // => 1\n *\n * // The `_.property` iteratee shorthand.\n * _.sortedIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');\n * // => 0\n */\nfunction sortedIndexBy(array, value, iteratee) {\n  return baseSortedIndexBy(array, value, baseIteratee(iteratee));\n}\n\nexport default sortedIndexBy;\n","import baseSortedIndex from './_baseSortedIndex';\nimport eq from './eq';\n\n/**\n * This method is like `_.indexOf` except that it performs a binary\n * search on a sorted `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.sortedIndexOf([1, 1, 2, 2], 2);\n * // => 2\n */\nfunction sortedIndexOf(array, value) {\n  var length = array ? array.length : 0;\n  if (length) {\n    var index = baseSortedIndex(array, value);\n    if (index < length && eq(array[index], value)) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default sortedIndexOf;\n","import baseSortedIndex from './_baseSortedIndex';\n\n/**\n * This method is like `_.sortedIndex` except that it returns the highest\n * index at which `value` should be inserted into `array` in order to\n * maintain its sort order.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n * @example\n *\n * _.sortedLastIndex([4, 5], 4);\n * // => 1\n */\nfunction sortedLastIndex(array, value) {\n  return baseSortedIndex(array, value, true);\n}\n\nexport default sortedLastIndex;\n","import baseIteratee from './_baseIteratee';\nimport baseSortedIndexBy from './_baseSortedIndexBy';\n\n/**\n * This method is like `_.sortedLastIndex` except that it accepts `iteratee`\n * which is invoked for `value` and each element of `array` to compute their\n * sort ranking. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The sorted array to inspect.\n * @param {*} value The value to evaluate.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {number} Returns the index at which `value` should be inserted\n *  into `array`.\n * @example\n *\n * // The `_.property` iteratee shorthand.\n * _.sortedLastIndexBy([{ 'x': 4 }, { 'x': 5 }], { 'x': 4 }, 'x');\n * // => 1\n */\nfunction sortedLastIndexBy(array, value, iteratee) {\n  return baseSortedIndexBy(array, value, baseIteratee(iteratee), true);\n}\n\nexport default sortedLastIndexBy;\n","import baseSortedIndex from './_baseSortedIndex';\nimport eq from './eq';\n\n/**\n * This method is like `_.lastIndexOf` except that it performs a binary\n * search on a sorted `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to search.\n * @param {*} value The value to search for.\n * @returns {number} Returns the index of the matched value, else `-1`.\n * @example\n *\n * _.sortedLastIndexOf([1, 1, 2, 2], 2);\n * // => 3\n */\nfunction sortedLastIndexOf(array, value) {\n  var length = array ? array.length : 0;\n  if (length) {\n    var index = baseSortedIndex(array, value, true) - 1;\n    if (eq(array[index], value)) {\n      return index;\n    }\n  }\n  return -1;\n}\n\nexport default sortedLastIndexOf;\n","import eq from './eq';\n\n/**\n * The base implementation of `_.sortedUniq` and `_.sortedUniqBy` without\n * support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n */\nfunction baseSortedUniq(array, iteratee) {\n  var index = -1,\n      length = array.length,\n      resIndex = 0,\n      result = [];\n\n  while (++index < length) {\n    var value = array[index],\n        computed = iteratee ? iteratee(value) : value;\n\n    if (!index || !eq(computed, seen)) {\n      var seen = computed;\n      result[resIndex++] = value === 0 ? 0 : value;\n    }\n  }\n  return result;\n}\n\nexport default baseSortedUniq;\n","import baseSortedUniq from './_baseSortedUniq';\n\n/**\n * This method is like `_.uniq` except that it's designed and optimized\n * for sorted arrays.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.sortedUniq([1, 1, 2]);\n * // => [1, 2]\n */\nfunction sortedUniq(array) {\n  return (array && array.length)\n    ? baseSortedUniq(array)\n    : [];\n}\n\nexport default sortedUniq;\n","import baseIteratee from './_baseIteratee';\nimport baseSortedUniq from './_baseSortedUniq';\n\n/**\n * This method is like `_.uniqBy` except that it's designed and optimized\n * for sorted arrays.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.sortedUniqBy([1.1, 1.2, 2.3, 2.4], Math.floor);\n * // => [1.1, 2.3]\n */\nfunction sortedUniqBy(array, iteratee) {\n  return (array && array.length)\n    ? baseSortedUniq(array, baseIteratee(iteratee))\n    : [];\n}\n\nexport default sortedUniqBy;\n","import drop from './drop';\n\n/**\n * Gets all but the first element of `array`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.tail([1, 2, 3]);\n * // => [2, 3]\n */\nfunction tail(array) {\n  return drop(array, 1);\n}\n\nexport default tail;\n","import baseSlice from './_baseSlice';\nimport toInteger from './toInteger';\n\n/**\n * Creates a slice of `array` with `n` elements taken from the beginning.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to take.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.take([1, 2, 3]);\n * // => [1]\n *\n * _.take([1, 2, 3], 2);\n * // => [1, 2]\n *\n * _.take([1, 2, 3], 5);\n * // => [1, 2, 3]\n *\n * _.take([1, 2, 3], 0);\n * // => []\n */\nfunction take(array, n, guard) {\n  if (!(array && array.length)) {\n    return [];\n  }\n  n = (guard || n === undefined) ? 1 : toInteger(n);\n  return baseSlice(array, 0, n < 0 ? 0 : n);\n}\n\nexport default take;\n","import baseSlice from './_baseSlice';\nimport toInteger from './toInteger';\n\n/**\n * Creates a slice of `array` with `n` elements taken from the end.\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {number} [n=1] The number of elements to take.\n * @param- {Object} [guard] Enables use as an iteratee for methods like `_.map`.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * _.takeRight([1, 2, 3]);\n * // => [3]\n *\n * _.takeRight([1, 2, 3], 2);\n * // => [2, 3]\n *\n * _.takeRight([1, 2, 3], 5);\n * // => [1, 2, 3]\n *\n * _.takeRight([1, 2, 3], 0);\n * // => []\n */\nfunction takeRight(array, n, guard) {\n  var length = array ? array.length : 0;\n  if (!length) {\n    return [];\n  }\n  n = (guard || n === undefined) ? 1 : toInteger(n);\n  n = length - n;\n  return baseSlice(array, n < 0 ? 0 : n, length);\n}\n\nexport default takeRight;\n","import baseIteratee from './_baseIteratee';\nimport baseWhile from './_baseWhile';\n\n/**\n * Creates a slice of `array` with elements taken from the end. Elements are\n * taken until `predicate` returns falsey. The predicate is invoked with\n * three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': true },\n *   { 'user': 'fred',    'active': false },\n *   { 'user': 'pebbles', 'active': false }\n * ];\n *\n * _.takeRightWhile(users, function(o) { return !o.active; });\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.matches` iteratee shorthand.\n * _.takeRightWhile(users, { 'user': 'pebbles', 'active': false });\n * // => objects for ['pebbles']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.takeRightWhile(users, ['active', false]);\n * // => objects for ['fred', 'pebbles']\n *\n * // The `_.property` iteratee shorthand.\n * _.takeRightWhile(users, 'active');\n * // => []\n */\nfunction takeRightWhile(array, predicate) {\n  return (array && array.length)\n    ? baseWhile(array, baseIteratee(predicate, 3), false, true)\n    : [];\n}\n\nexport default takeRightWhile;\n","import baseIteratee from './_baseIteratee';\nimport baseWhile from './_baseWhile';\n\n/**\n * Creates a slice of `array` with elements taken from the beginning. Elements\n * are taken until `predicate` returns falsey. The predicate is invoked with\n * three arguments: (value, index, array).\n *\n * @static\n * @memberOf _\n * @since 3.0.0\n * @category Array\n * @param {Array} array The array to query.\n * @param {Array|Function|Object|string} [predicate=_.identity]\n *  The function invoked per iteration.\n * @returns {Array} Returns the slice of `array`.\n * @example\n *\n * var users = [\n *   { 'user': 'barney',  'active': false },\n *   { 'user': 'fred',    'active': false},\n *   { 'user': 'pebbles', 'active': true }\n * ];\n *\n * _.takeWhile(users, function(o) { return !o.active; });\n * // => objects for ['barney', 'fred']\n *\n * // The `_.matches` iteratee shorthand.\n * _.takeWhile(users, { 'user': 'barney', 'active': false });\n * // => objects for ['barney']\n *\n * // The `_.matchesProperty` iteratee shorthand.\n * _.takeWhile(users, ['active', false]);\n * // => objects for ['barney', 'fred']\n *\n * // The `_.property` iteratee shorthand.\n * _.takeWhile(users, 'active');\n * // => []\n */\nfunction takeWhile(array, predicate) {\n  return (array && array.length)\n    ? baseWhile(array, baseIteratee(predicate, 3))\n    : [];\n}\n\nexport default takeWhile;\n","/**\n * A no-operation function that returns `undefined` regardless of the\n * arguments it receives.\n *\n * @static\n * @memberOf _\n * @since 2.3.0\n * @category Util\n * @example\n *\n * var object = { 'user': 'fred' };\n *\n * _.noop(object) === undefined;\n * // => true\n */\nfunction noop() {\n  // No operation performed.\n}\n\nexport default noop;\n","import Set from './_Set';\nimport noop from './noop';\nimport setToArray from './_setToArray';\n\n/** Used as references for various `Number` constants. */\nvar INFINITY = 1 / 0;\n\n/**\n * Creates a set of `values`.\n *\n * @private\n * @param {Array} values The values to add to the set.\n * @returns {Object} Returns the new set.\n */\nvar createSet = !(Set && (1 / setToArray(new Set([,-0]))[1]) == INFINITY) ? noop : function(values) {\n  return new Set(values);\n};\n\nexport default createSet;\n","import SetCache from './_SetCache';\nimport arrayIncludes from './_arrayIncludes';\nimport arrayIncludesWith from './_arrayIncludesWith';\nimport cacheHas from './_cacheHas';\nimport createSet from './_createSet';\nimport setToArray from './_setToArray';\n\n/** Used as the size to enable large array optimizations. */\nvar LARGE_ARRAY_SIZE = 200;\n\n/**\n * The base implementation of `_.uniqBy` without support for iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n */\nfunction baseUniq(array, iteratee, comparator) {\n  var index = -1,\n      includes = arrayIncludes,\n      length = array.length,\n      isCommon = true,\n      result = [],\n      seen = result;\n\n  if (comparator) {\n    isCommon = false;\n    includes = arrayIncludesWith;\n  }\n  else if (length >= LARGE_ARRAY_SIZE) {\n    var set = iteratee ? null : createSet(array);\n    if (set) {\n      return setToArray(set);\n    }\n    isCommon = false;\n    includes = cacheHas;\n    seen = new SetCache;\n  }\n  else {\n    seen = iteratee ? [] : result;\n  }\n  outer:\n  while (++index < length) {\n    var value = array[index],\n        computed = iteratee ? iteratee(value) : value;\n\n    value = (comparator || value !== 0) ? value : 0;\n    if (isCommon && computed === computed) {\n      var seenIndex = seen.length;\n      while (seenIndex--) {\n        if (seen[seenIndex] === computed) {\n          continue outer;\n        }\n      }\n      if (iteratee) {\n        seen.push(computed);\n      }\n      result.push(value);\n    }\n    else if (!includes(seen, computed, comparator)) {\n      if (seen !== result) {\n        seen.push(computed);\n      }\n      result.push(value);\n    }\n  }\n  return result;\n}\n\nexport default baseUniq;\n","import baseFlatten from './_baseFlatten';\nimport baseUniq from './_baseUniq';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport rest from './rest';\n\n/**\n * Creates an array of unique values, in order, from all given arrays using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * _.union([2, 1], [4, 2], [1, 2]);\n * // => [2, 1, 4]\n */\nvar union = rest(function(arrays) {\n  return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true));\n});\n\nexport default union;\n","import baseFlatten from './_baseFlatten';\nimport baseIteratee from './_baseIteratee';\nimport baseUniq from './_baseUniq';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.union` except that it accepts `iteratee` which is\n * invoked for each element of each `arrays` to generate the criterion by\n * which uniqueness is computed. The iteratee is invoked with one argument:\n * (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * _.unionBy([2.1, 1.2], [4.3, 2.4], Math.floor);\n * // => [2.1, 1.2, 4.3]\n *\n * // The `_.property` iteratee shorthand.\n * _.unionBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }, { 'x': 2 }]\n */\nvar unionBy = rest(function(arrays) {\n  var iteratee = last(arrays);\n  if (isArrayLikeObject(iteratee)) {\n    iteratee = undefined;\n  }\n  return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), baseIteratee(iteratee));\n});\n\nexport default unionBy;\n","import baseFlatten from './_baseFlatten';\nimport baseUniq from './_baseUniq';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.union` except that it accepts `comparator` which\n * is invoked to compare elements of `arrays`. The comparator is invoked\n * with two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of combined values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.unionWith(objects, others, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]\n */\nvar unionWith = rest(function(arrays) {\n  var comparator = last(arrays);\n  if (isArrayLikeObject(comparator)) {\n    comparator = undefined;\n  }\n  return baseUniq(baseFlatten(arrays, 1, isArrayLikeObject, true), undefined, comparator);\n});\n\nexport default unionWith;\n","import baseUniq from './_baseUniq';\n\n/**\n * Creates a duplicate-free version of an array, using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons, in which only the first occurrence of each\n * element is kept.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.uniq([2, 1, 2]);\n * // => [2, 1]\n */\nfunction uniq(array) {\n  return (array && array.length)\n    ? baseUniq(array)\n    : [];\n}\n\nexport default uniq;\n","import baseIteratee from './_baseIteratee';\nimport baseUniq from './_baseUniq';\n\n/**\n * This method is like `_.uniq` except that it accepts `iteratee` which is\n * invoked for each element in `array` to generate the criterion by which\n * uniqueness is computed. The iteratee is invoked with one argument: (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * _.uniqBy([2.1, 1.2, 2.3], Math.floor);\n * // => [2.1, 1.2]\n *\n * // The `_.property` iteratee shorthand.\n * _.uniqBy([{ 'x': 1 }, { 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 1 }, { 'x': 2 }]\n */\nfunction uniqBy(array, iteratee) {\n  return (array && array.length)\n    ? baseUniq(array, baseIteratee(iteratee))\n    : [];\n}\n\nexport default uniqBy;\n","import baseUniq from './_baseUniq';\n\n/**\n * This method is like `_.uniq` except that it accepts `comparator` which\n * is invoked to compare elements of `array`. The comparator is invoked with\n * two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new duplicate free array.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 },  { 'x': 1, 'y': 2 }];\n *\n * _.uniqWith(objects, _.isEqual);\n * // => [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }]\n */\nfunction uniqWith(array, comparator) {\n  return (array && array.length)\n    ? baseUniq(array, undefined, comparator)\n    : [];\n}\n\nexport default uniqWith;\n","/**\n * A specialized version of `_.filter` for arrays without support for\n * iteratee shorthands.\n *\n * @private\n * @param {Array} array The array to iterate over.\n * @param {Function} predicate The function invoked per iteration.\n * @returns {Array} Returns the new filtered array.\n */\nfunction arrayFilter(array, predicate) {\n  var index = -1,\n      length = array.length,\n      resIndex = 0,\n      result = [];\n\n  while (++index < length) {\n    var value = array[index];\n    if (predicate(value, index, array)) {\n      result[resIndex++] = value;\n    }\n  }\n  return result;\n}\n\nexport default arrayFilter;\n","import arrayFilter from './_arrayFilter';\nimport arrayMap from './_arrayMap';\nimport baseProperty from './_baseProperty';\nimport baseTimes from './_baseTimes';\nimport isArrayLikeObject from './isArrayLikeObject';\n\n/* Built-in method references for those with the same name as other `lodash` methods. */\nvar nativeMax = Math.max;\n\n/**\n * This method is like `_.zip` except that it accepts an array of grouped\n * elements and creates an array regrouping the elements to their pre-zip\n * configuration.\n *\n * @static\n * @memberOf _\n * @since 1.2.0\n * @category Array\n * @param {Array} array The array of grouped elements to process.\n * @returns {Array} Returns the new array of regrouped elements.\n * @example\n *\n * var zipped = _.zip(['fred', 'barney'], [30, 40], [true, false]);\n * // => [['fred', 30, true], ['barney', 40, false]]\n *\n * _.unzip(zipped);\n * // => [['fred', 'barney'], [30, 40], [true, false]]\n */\nfunction unzip(array) {\n  if (!(array && array.length)) {\n    return [];\n  }\n  var length = 0;\n  array = arrayFilter(array, function(group) {\n    if (isArrayLikeObject(group)) {\n      length = nativeMax(group.length, length);\n      return true;\n    }\n  });\n  return baseTimes(length, function(index) {\n    return arrayMap(array, baseProperty(index));\n  });\n}\n\nexport default unzip;\n","import apply from './_apply';\nimport arrayMap from './_arrayMap';\nimport unzip from './unzip';\n\n/**\n * This method is like `_.unzip` except that it accepts `iteratee` to specify\n * how regrouped values should be combined. The iteratee is invoked with the\n * elements of each group: (...group).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Array\n * @param {Array} array The array of grouped elements to process.\n * @param {Function} [iteratee=_.identity] The function to combine\n *  regrouped values.\n * @returns {Array} Returns the new array of regrouped elements.\n * @example\n *\n * var zipped = _.zip([1, 2], [10, 20], [100, 200]);\n * // => [[1, 10, 100], [2, 20, 200]]\n *\n * _.unzipWith(zipped, _.add);\n * // => [3, 30, 300]\n */\nfunction unzipWith(array, iteratee) {\n  if (!(array && array.length)) {\n    return [];\n  }\n  var result = unzip(array);\n  if (iteratee == null) {\n    return result;\n  }\n  return arrayMap(result, function(group) {\n    return apply(iteratee, undefined, group);\n  });\n}\n\nexport default unzipWith;\n","import baseDifference from './_baseDifference';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport rest from './rest';\n\n/**\n * Creates an array excluding all given values using\n * [`SameValueZero`](http://ecma-international.org/ecma-262/6.0/#sec-samevaluezero)\n * for equality comparisons.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {Array} array The array to inspect.\n * @param {...*} [values] The values to exclude.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.difference, _.xor\n * @example\n *\n * _.without([1, 2, 1, 3], 1, 2);\n * // => [3]\n */\nvar without = rest(function(array, values) {\n  return isArrayLikeObject(array)\n    ? baseDifference(array, values)\n    : [];\n});\n\nexport default without;\n","import arrayPush from './_arrayPush';\nimport baseDifference from './_baseDifference';\nimport baseUniq from './_baseUniq';\n\n/**\n * The base implementation of methods like `_.xor`, without support for\n * iteratee shorthands, that accepts an array of arrays to inspect.\n *\n * @private\n * @param {Array} arrays The arrays to inspect.\n * @param {Function} [iteratee] The iteratee invoked per element.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of values.\n */\nfunction baseXor(arrays, iteratee, comparator) {\n  var index = -1,\n      length = arrays.length;\n\n  while (++index < length) {\n    var result = result\n      ? arrayPush(\n          baseDifference(result, arrays[index], iteratee, comparator),\n          baseDifference(arrays[index], result, iteratee, comparator)\n        )\n      : arrays[index];\n  }\n  return (result && result.length) ? baseUniq(result, iteratee, comparator) : [];\n}\n\nexport default baseXor;\n","import arrayFilter from './_arrayFilter';\nimport baseXor from './_baseXor';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport rest from './rest';\n\n/**\n * Creates an array of unique values that is the\n * [symmetric difference](https://en.wikipedia.org/wiki/Symmetric_difference)\n * of the given arrays. The order of result values is determined by the order\n * they occur in the arrays.\n *\n * @static\n * @memberOf _\n * @since 2.4.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @returns {Array} Returns the new array of filtered values.\n * @see _.difference, _.without\n * @example\n *\n * _.xor([2, 1], [4, 2]);\n * // => [1, 4]\n */\nvar xor = rest(function(arrays) {\n  return baseXor(arrayFilter(arrays, isArrayLikeObject));\n});\n\nexport default xor;\n","import arrayFilter from './_arrayFilter';\nimport baseIteratee from './_baseIteratee';\nimport baseXor from './_baseXor';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.xor` except that it accepts `iteratee` which is\n * invoked for each element of each `arrays` to generate the criterion by\n * which by which they're compared. The iteratee is invoked with one argument:\n * (value).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Array|Function|Object|string} [iteratee=_.identity]\n *  The iteratee invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * _.xorBy([2.1, 1.2], [4.3, 2.4], Math.floor);\n * // => [1.2, 4.3]\n *\n * // The `_.property` iteratee shorthand.\n * _.xorBy([{ 'x': 1 }], [{ 'x': 2 }, { 'x': 1 }], 'x');\n * // => [{ 'x': 2 }]\n */\nvar xorBy = rest(function(arrays) {\n  var iteratee = last(arrays);\n  if (isArrayLikeObject(iteratee)) {\n    iteratee = undefined;\n  }\n  return baseXor(arrayFilter(arrays, isArrayLikeObject), baseIteratee(iteratee));\n});\n\nexport default xorBy;\n","import arrayFilter from './_arrayFilter';\nimport baseXor from './_baseXor';\nimport isArrayLikeObject from './isArrayLikeObject';\nimport last from './last';\nimport rest from './rest';\n\n/**\n * This method is like `_.xor` except that it accepts `comparator` which is\n * invoked to compare elements of `arrays`. The comparator is invoked with\n * two arguments: (arrVal, othVal).\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Array\n * @param {...Array} [arrays] The arrays to inspect.\n * @param {Function} [comparator] The comparator invoked per element.\n * @returns {Array} Returns the new array of filtered values.\n * @example\n *\n * var objects = [{ 'x': 1, 'y': 2 }, { 'x': 2, 'y': 1 }];\n * var others = [{ 'x': 1, 'y': 1 }, { 'x': 1, 'y': 2 }];\n *\n * _.xorWith(objects, others, _.isEqual);\n * // => [{ 'x': 2, 'y': 1 }, { 'x': 1, 'y': 1 }]\n */\nvar xorWith = rest(function(arrays) {\n  var comparator = last(arrays);\n  if (isArrayLikeObject(comparator)) {\n    comparator = undefined;\n  }\n  return baseXor(arrayFilter(arrays, isArrayLikeObject), undefined, comparator);\n});\n\nexport default xorWith;\n","import rest from './rest';\nimport unzip from './unzip';\n\n/**\n * Creates an array of grouped elements, the first of which contains the\n * first elements of the given arrays, the second of which contains the\n * second elements of the given arrays, and so on.\n *\n * @static\n * @memberOf _\n * @since 0.1.0\n * @category Array\n * @param {...Array} [arrays] The arrays to process.\n * @returns {Array} Returns the new array of grouped elements.\n * @example\n *\n * _.zip(['fred', 'barney'], [30, 40], [true, false]);\n * // => [['fred', 30, true], ['barney', 40, false]]\n */\nvar zip = rest(unzip);\n\nexport default zip;\n","/**\n * This base implementation of `_.zipObject` which assigns values using `assignFunc`.\n *\n * @private\n * @param {Array} props The property identifiers.\n * @param {Array} values The property values.\n * @param {Function} assignFunc The function to assign values.\n * @returns {Object} Returns the new object.\n */\nfunction baseZipObject(props, values, assignFunc) {\n  var index = -1,\n      length = props.length,\n      valsLength = values.length,\n      result = {};\n\n  while (++index < length) {\n    var value = index < valsLength ? values[index] : undefined;\n    assignFunc(result, props[index], value);\n  }\n  return result;\n}\n\nexport default baseZipObject;\n","import assignValue from './_assignValue';\nimport baseZipObject from './_baseZipObject';\n\n/**\n * This method is like `_.fromPairs` except that it accepts two arrays,\n * one of property identifiers and one of corresponding values.\n *\n * @static\n * @memberOf _\n * @since 0.4.0\n * @category Array\n * @param {Array} [props=[]] The property identifiers.\n * @param {Array} [values=[]] The property values.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.zipObject(['a', 'b'], [1, 2]);\n * // => { 'a': 1, 'b': 2 }\n */\nfunction zipObject(props, values) {\n  return baseZipObject(props || [], values || [], assignValue);\n}\n\nexport default zipObject;\n","import assignValue from './_assignValue';\nimport castPath from './_castPath';\nimport isIndex from './_isIndex';\nimport isKey from './_isKey';\nimport isObject from './isObject';\nimport toKey from './_toKey';\n\n/**\n * The base implementation of `_.set`.\n *\n * @private\n * @param {Object} object The object to query.\n * @param {Array|string} path The path of the property to set.\n * @param {*} value The value to set.\n * @param {Function} [customizer] The function to customize path creation.\n * @returns {Object} Returns `object`.\n */\nfunction baseSet(object, path, value, customizer) {\n  path = isKey(path, object) ? [path] : castPath(path);\n\n  var index = -1,\n      length = path.length,\n      lastIndex = length - 1,\n      nested = object;\n\n  while (nested != null && ++index < length) {\n    var key = toKey(path[index]);\n    if (isObject(nested)) {\n      var newValue = value;\n      if (index != lastIndex) {\n        var objValue = nested[key];\n        newValue = customizer ? customizer(objValue, key, nested) : undefined;\n        if (newValue === undefined) {\n          newValue = objValue == null\n            ? (isIndex(path[index + 1]) ? [] : {})\n            : objValue;\n        }\n      }\n      assignValue(nested, key, newValue);\n    }\n    nested = nested[key];\n  }\n  return object;\n}\n\nexport default baseSet;\n","import baseSet from './_baseSet';\nimport baseZipObject from './_baseZipObject';\n\n/**\n * This method is like `_.zipObject` except that it supports property paths.\n *\n * @static\n * @memberOf _\n * @since 4.1.0\n * @category Array\n * @param {Array} [props=[]] The property identifiers.\n * @param {Array} [values=[]] The property values.\n * @returns {Object} Returns the new object.\n * @example\n *\n * _.zipObjectDeep(['a.b[0].c', 'a.b[1].d'], [1, 2]);\n * // => { 'a': { 'b': [{ 'c': 1 }, { 'd': 2 }] } }\n */\nfunction zipObjectDeep(props, values) {\n  return baseZipObject(props || [], values || [], baseSet);\n}\n\nexport default zipObjectDeep;\n","import rest from './rest';\nimport unzipWith from './unzipWith';\n\n/**\n * This method is like `_.zip` except that it accepts `iteratee` to specify\n * how grouped values should be combined. The iteratee is invoked with the\n * elements of each group: (...group).\n *\n * @static\n * @memberOf _\n * @since 3.8.0\n * @category Array\n * @param {...Array} [arrays] The arrays to process.\n * @param {Function} [iteratee=_.identity] The function to combine grouped values.\n * @returns {Array} Returns the new array of grouped elements.\n * @example\n *\n * _.zipWith([1, 2], [10, 20], [100, 200], function(a, b, c) {\n *   return a + b + c;\n * });\n * // => [111, 222]\n */\nvar zipWith = rest(function(arrays) {\n  var length = arrays.length,\n      iteratee = length > 1 ? arrays[length - 1] : undefined;\n\n  iteratee = typeof iteratee == 'function' ? (arrays.pop(), iteratee) : undefined;\n  return unzipWith(arrays, iteratee);\n});\n\nexport default zipWith;\n","import chunk from './chunk';\nimport compact from './compact';\nimport concat from './concat';\nimport difference from './difference';\nimport differenceBy from './differenceBy';\nimport differenceWith from './differenceWith';\nimport drop from './drop';\nimport dropRight from './dropRight';\nimport dropRightWhile from './dropRightWhile';\nimport dropWhile from './dropWhile';\nimport fill from './fill';\nimport findIndex from './findIndex';\nimport findLastIndex from './findLastIndex';\nimport first from './first';\nimport flatten from './flatten';\nimport flattenDeep from './flattenDeep';\nimport flattenDepth from './flattenDepth';\nimport fromPairs from './fromPairs';\nimport head from './head';\nimport indexOf from './indexOf';\nimport initial from './initial';\nimport intersection from './intersection';\nimport intersectionBy from './intersectionBy';\nimport intersectionWith from './intersectionWith';\nimport join from './join';\nimport last from './last';\nimport lastIndexOf from './lastIndexOf';\nimport nth from './nth';\nimport pull from './pull';\nimport pullAll from './pullAll';\nimport pullAllBy from './pullAllBy';\nimport pullAllWith from './pullAllWith';\nimport pullAt from './pullAt';\nimport remove from './remove';\nimport reverse from './reverse';\nimport slice from './slice';\nimport sortedIndex from './sortedIndex';\nimport sortedIndexBy from './sortedIndexBy';\nimport sortedIndexOf from './sortedIndexOf';\nimport sortedLastIndex from './sortedLastIndex';\nimport sortedLastIndexBy from './sortedLastIndexBy';\nimport sortedLastIndexOf from './sortedLastIndexOf';\nimport sortedUniq from './sortedUniq';\nimport sortedUniqBy from './sortedUniqBy';\nimport tail from './tail';\nimport take from './take';\nimport takeRight from './takeRight';\nimport takeRightWhile from './takeRightWhile';\nimport takeWhile from './takeWhile';\nimport union from './union';\nimport unionBy from './unionBy';\nimport unionWith from './unionWith';\nimport uniq from './uniq';\nimport uniqBy from './uniqBy';\nimport uniqWith from './uniqWith';\nimport unzip from './unzip';\nimport unzipWith from './unzipWith';\nimport without from './without';\nimport xor from './xor';\nimport xorBy from './xorBy';\nimport xorWith from './xorWith';\nimport zip from './zip';\nimport zipObject from './zipObject';\nimport zipObjectDeep from './zipObjectDeep';\nimport zipWith from './zipWith';\n\nexport default {\n  chunk, compact, concat, difference, differenceBy,\n  differenceWith, drop, dropRight, dropRightWhile, dropWhile,\n  fill, findIndex, findLastIndex, first, flatten,\n  flattenDeep, flattenDepth, fromPairs, head, indexOf,\n  initial, intersection, intersectionBy, intersectionWith, join,\n  last, lastIndexOf, nth, pull, pullAll,\n  pullAllBy, pullAllWith, pullAt, remove, reverse,\n  slice, sortedIndex, sortedIndexBy, sortedIndexOf, sortedLastIndex,\n  sortedLastIndexBy, sortedLastIndexOf, sortedUniq, sortedUniqBy, tail,\n  take, takeRight, takeRightWhile, takeWhile, union,\n  unionBy, unionWith, uniq, uniqBy, uniqWith,\n  unzip, unzipWith, without, xor, xorBy,\n  xorWith, zip, zipObject, zipObjectDeep, zipWith\n};\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @protected\n * @module engine/model/delta/transform\n */\n\nimport Delta from './delta';\nimport MoveDelta from './movedelta';\nimport RemoveDelta from './removedelta';\nimport MergeDelta from './mergedelta';\nimport SplitDelta from './splitdelta';\nimport WrapDelta from './wrapdelta';\nimport UnwrapDelta from './unwrapdelta';\nimport RenameDelta from './renamedelta';\nimport AttributeDelta from './attributedelta';\nimport operationTransform from '../operation/transform';\nimport NoOperation from '../operation/nooperation';\nimport MoveOperation from '../operation/moveoperation';\nimport RemoveOperation from '../operation/removeoperation';\nimport arrayUtils from '@ckeditor/ckeditor5-utils/src/lib/lodash/array';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\nconst specialCases = new Map();\n\n/**\n * @namespace\n */\nconst transform = {\n\t/**\n\t * Transforms given {@link module:engine/model/delta/delta~Delta delta} by another {@link module:engine/model/delta/delta~Delta delta}\n\t * and returns the result of that transformation as an array containing one or more {@link module:engine/model/delta/delta~Delta delta}\n\t * instances.\n\t *\n\t * Delta transformations heavily base on {@link module:engine/model/operation/transform~transform operational transformations}. Since\n\t * delta is a list of operations most situations can be handled thanks to operational transformation. Unfortunately,\n\t * deltas are more complicated than operations and have they semantic meaning, as they represent user's editing intentions.\n\t *\n\t * Sometimes, simple operational transformation on deltas' operations might result in some unexpected results. Those\n\t * results would be fine from OT point of view, but would not reflect user's intentions. Because of such conflicts\n\t * we need to handle transformations in special cases in a custom way.\n\t *\n\t * The function itself looks whether two given delta types have a special case function registered. If so, the deltas are\n\t * transformed using that function. If not,\n\t * {@link module:engine/model/delta/transform~transform.defaultTransform default transformation algorithm} is used.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} a Delta that will be transformed.\n\t * @param {module:engine/model/delta/delta~Delta} b Delta to transform by.\n\t * @param {module:engine/model/delta/transform~transformationContext} context Transformation context object.\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} Result of the transformation.\n\t */\n\ttransform( a, b, context ) {\n\t\tconst transformAlgorithm = transform.getTransformationCase( a, b ) || transform.defaultTransform;\n\n\t\t// Make new instance of context object, so all changes done during transformation are not saved in original object.\n\t\tconst transformed = transformAlgorithm( a, b, Object.assign( {}, context ) );\n\t\tconst baseVersion = arrayUtils.last( b.operations ).baseVersion;\n\n\t\treturn updateBaseVersion( baseVersion, transformed );\n\t},\n\n\t/**\n\t * The default delta transformation function. It is used for those deltas that are not in special case conflict.\n\t *\n\t * This algorithm is similar to a popular `dOPT` algorithm used in operational transformation, as we are in fact\n\t * transforming two sets of operations by each other.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} a Delta that will be transformed.\n\t * @param {module:engine/model/delta/delta~Delta} b Delta to transform by.\n\t * @param {module:engine/model/delta/transform~transformationContext} context Transformation context object.\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} Result of the transformation.\n\t */\n\tdefaultTransform( a, b, context ) {\n\t\t// This will hold operations from delta `a` that will be transformed by operations from delta `b`.\n\t\t// Eventually, those operations will be used to create result delta(s).\n\t\tconst transformed = [];\n\n\t\t// Array containing operations that we will transform by. At the beginning these are just operations from\n\t\tlet byOps = b.operations;\n\n\t\t// This array is storing operations from `byOps` which got transformed by operation from delta `a`.\n\t\tlet newByOps = [];\n\n\t\t// We take each operation from original set of operations to transform.\n\t\tfor ( const opA of a.operations ) {\n\t\t\t// We wrap the operation in the array. This is important, because operation transformation algorithm returns\n\t\t\t// an array of operations so we need to make sure that our algorithm is ready to handle arrays.\n\t\t\tconst ops = [ opA ];\n\n\t\t\t// Now the real algorithm takes place.\n\t\t\tfor ( const opB of byOps ) {\n\t\t\t\t// For each operation that we need transform by...\n\t\t\t\tfor ( let i = 0; i < ops.length; i++ ) {\n\t\t\t\t\t// We take each operation to transform...\n\t\t\t\t\tconst op = ops[ i ];\n\n\t\t\t\t\t// And transform both of them by themselves.\n\n\t\t\t\t\t// The result of transforming operation from delta B by operation from delta A is saved in\n\t\t\t\t\t// `newByOps` array. We will use that array for transformations in next loops. We need delta B\n\t\t\t\t\t// operations after transformed by delta A operations to get correct results of transformations\n\t\t\t\t\t// of next operations from delta A.\n\t\t\t\t\t//\n\t\t\t\t\t// It's like this because 2nd operation from delta A assumes that 1st operation from delta A\n\t\t\t\t\t// is \"already applied\". When we transform 2nd operation from delta A by operations from delta B\n\t\t\t\t\t// we have to be sure that operations from delta B are in a state that acknowledges 1st operation\n\t\t\t\t\t// from delta A.\n\t\t\t\t\t//\n\t\t\t\t\t// This can be easier understood when operations sets to transform are represented by diamond diagrams:\n\t\t\t\t\t// http://www.codecommit.com/blog/java/understanding-and-applying-operational-transformation\n\n\t\t\t\t\t// Transform operation from delta A by operation from delta B.\n\t\t\t\t\tconst results = operationTransform( op, opB, context );\n\n\t\t\t\t\t// We replace currently processed operation from `ops` array by the results of transformation.\n\t\t\t\t\t// Note, that we process single operation but `operationTransform` result is an array, so we\n\t\t\t\t\t// might have to splice-in more than one operation. Save them in `ops` array and move `i` pointer by a proper offset.\n\t\t\t\t\tArray.prototype.splice.apply( ops, [ i, 1 ].concat( results ) );\n\n\t\t\t\t\ti += results.length - 1;\n\n\t\t\t\t\t// Then, transform operation from delta B by operation from delta A.\n\t\t\t\t\t// Since this is a \"mirror\" transformation, first, we \"mirror\" some of context values.\n\t\t\t\t\tconst reverseContext = Object.assign( {}, context );\n\t\t\t\t\treverseContext.isStrong = !context.isStrong;\n\t\t\t\t\treverseContext.insertBefore = context.insertBefore !== undefined ? !context.insertBefore : undefined;\n\n\t\t\t\t\t// Transform operations.\n\t\t\t\t\tconst updatedOpB = operationTransform( opB, op, reverseContext );\n\n\t\t\t\t\t// Update `newByOps` by transformed, updated `opB`.\n\t\t\t\t\t// Using push.apply because `operationTransform` returns an array with one or multiple results.\n\t\t\t\t\tArray.prototype.push.apply( newByOps, updatedOpB );\n\t\t\t\t}\n\n\t\t\t\t// At this point a single operation from delta A got transformed by a single operation from delta B.\n\t\t\t\t// The transformation result is in `ops` array and it may be one or more operations. This was just the first step.\n\t\t\t\t// Operation from delta A has to be further transformed by the other operations from delta B.\n\t\t\t\t// So in next iterator loop we will take another operation from delta B and use transformed delta A (`ops`)\n\t\t\t\t// to transform it further.\n\t\t\t}\n\n\t\t\t// We got through all delta B operations and have a final transformed state of an operation from delta A.\n\n\t\t\t// As previously mentioned, we substitute operations from delta B by their transformed equivalents.\n\t\t\tbyOps = newByOps;\n\t\t\tnewByOps = [];\n\n\t\t\t// We add transformed operation from delta A to newly created delta.\n\t\t\t// Remember that transformed operation from delta A may consist of multiple operations.\n\t\t\tfor ( const op of ops ) {\n\t\t\t\ttransformed.push( op );\n\t\t\t}\n\n\t\t\t// In next loop, we will take another operation from delta A and transform it through (transformed) operations\n\t\t\t// from delta B...\n\t\t}\n\n\t\treturn getNormalizedDeltas( a.constructor, transformed );\n\t},\n\n\t/**\n\t * Adds a special case callback for given delta classes.\n\t *\n\t * @param {Function} A Delta constructor which instance will get transformed.\n\t * @param {Function} B Delta constructor which instance will be transformed by.\n\t * @param {Function} resolver A callback that will handle custom special case transformation for instances of given delta classes.\n\t */\n\taddTransformationCase( A, B, resolver ) {\n\t\tlet casesA = specialCases.get( A );\n\n\t\tif ( !casesA ) {\n\t\t\tcasesA = new Map();\n\t\t\tspecialCases.set( A, casesA );\n\t\t}\n\n\t\tcasesA.set( B, resolver );\n\t},\n\n\t/**\n\t * Gets a special case callback which was previously {@link module:engine/model/delta/transform~transform.addTransformationCase added}.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} a Delta to transform.\n\t * @param {module:engine/model/delta/delta~Delta} b Delta to be transformed by.\n\t */\n\tgetTransformationCase( a, b ) {\n\t\tlet casesA = specialCases.get( a.constructor );\n\n\t\t// If there are no special cases registered for class which `a` is instance of, we will\n\t\t// check if there are special cases registered for any parent class.\n\t\tif ( !casesA || !casesA.get( b.constructor ) ) {\n\t\t\tconst cases = specialCases.keys();\n\n\t\t\tfor ( const caseClass of cases ) {\n\t\t\t\tif ( a instanceof caseClass && specialCases.get( caseClass ).get( b.constructor ) ) {\n\t\t\t\t\tcasesA = specialCases.get( caseClass );\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif ( casesA ) {\n\t\t\treturn casesA.get( b.constructor );\n\t\t}\n\n\t\treturn undefined;\n\t},\n\n\t/**\n\t * Transforms two sets of deltas by themselves. Returns both transformed sets.\n\t *\n\t * @param {Array.<module:engine/model/delta/delta~Delta>} deltasA Array with the first set of deltas to transform. These\n\t * deltas are considered more important (than `deltasB`) when resolving conflicts.\n\t * @param {Array.<module:engine/model/delta/delta~Delta>} deltasB Array with the second set of deltas to transform. These\n\t * deltas are considered less important (than `deltasA`) when resolving conflicts.\n\t * @param {module:engine/model/document~Document} [document=null] If set, deltas will be transformed in \"undo mode\"\n\t * and given `document` will be used to determine relations between deltas. If not set (default), deltas will be\n\t * transforming without additional context information.\n\t * @returns {Object}\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} return.deltasA The first set of deltas transformed\n\t * by the second set of deltas.\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} return.deltasB The second set of deltas transformed\n\t * by the first set of deltas.\n\t */\n\ttransformDeltaSets( deltasA, deltasB, document = null ) {\n\t\tconst transformedDeltasA = Array.from( deltasA );\n\t\tconst transformedDeltasB = Array.from( deltasB );\n\n\t\tconst useAdditionalContext = document !== null;\n\n\t\tconst contextAB = {\n\t\t\tisStrong: true\n\t\t};\n\n\t\tif ( useAdditionalContext ) {\n\t\t\tcontextAB.wasAffected = new Map();\n\t\t\tcontextAB.originalDelta = new Map();\n\t\t\tcontextAB.document = document;\n\t\t\tcontextAB.undoMode = true;\n\n\t\t\tfor ( const delta of transformedDeltasB ) {\n\t\t\t\tcontextAB.originalDelta.set( delta, delta );\n\t\t\t}\n\t\t}\n\n\t\tfor ( let i = 0; i < transformedDeltasA.length; i++ ) {\n\t\t\tconst deltaA = [ transformedDeltasA[ i ] ];\n\n\t\t\tfor ( let j = 0; j < transformedDeltasB.length; j++ ) {\n\t\t\t\tconst deltaB = [ transformedDeltasB[ j ] ];\n\n\t\t\t\tfor ( let k = 0; k < deltaA.length; k++ ) {\n\t\t\t\t\tfor ( let l = 0; l < deltaB.length; l++ ) {\n\t\t\t\t\t\tif ( useAdditionalContext ) {\n\t\t\t\t\t\t\t_setContext( deltaA[ k ], deltaB[ l ], contextAB );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tconst resultAB = transform.transform( deltaA[ k ], deltaB[ l ], {\n\t\t\t\t\t\t\tinsertBefore: contextAB.insertBefore,\n\t\t\t\t\t\t\tforceNotSticky: contextAB.forceNotSticky,\n\t\t\t\t\t\t\tisStrong: contextAB.isStrong,\n\t\t\t\t\t\t\tforceWeakRemove: contextAB.forceWeakRemove,\n\t\t\t\t\t\t\tundoMode: contextAB.undoMode\n\t\t\t\t\t\t} );\n\n\t\t\t\t\t\tconst resultBA = transform.transform( deltaB[ l ], deltaA[ k ], {\n\t\t\t\t\t\t\tinsertBefore: !contextAB.insertBefore,\n\t\t\t\t\t\t\tforceNotSticky: contextAB.forceNotSticky,\n\t\t\t\t\t\t\tisStrong: !contextAB.isStrong,\n\t\t\t\t\t\t\tforceWeakRemove: contextAB.forceWeakRemove,\n\t\t\t\t\t\t\tundoMode: contextAB.undoMode\n\t\t\t\t\t\t} );\n\n\t\t\t\t\t\tif ( useAdditionalContext ) {\n\t\t\t\t\t\t\t_updateContext( deltaA[ k ], resultAB, contextAB );\n\n\t\t\t\t\t\t\tconst originalDelta = contextAB.originalDelta.get( deltaB[ l ] );\n\n\t\t\t\t\t\t\tfor ( const deltaBA of resultBA ) {\n\t\t\t\t\t\t\t\tcontextAB.originalDelta.set( deltaBA, originalDelta );\n\t\t\t\t\t\t\t}\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tdeltaA.splice( k, 1, ...resultAB );\n\t\t\t\t\t\tk += resultAB.length - 1;\n\n\t\t\t\t\t\tdeltaB.splice( l, 1, ...resultBA );\n\t\t\t\t\t\tl += resultBA.length - 1;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\ttransformedDeltasB.splice( j, 1, ...deltaB );\n\t\t\t\tj += deltaB.length - 1;\n\t\t\t}\n\n\t\t\ttransformedDeltasA.splice( i, 1, ...deltaA );\n\t\t\ti += deltaA.length - 1;\n\t\t}\n\n\t\tconst opsDiffA = getOpsCount( transformedDeltasA ) - getOpsCount( deltasA );\n\t\tconst opsDiffB = getOpsCount( transformedDeltasB ) - getOpsCount( deltasB );\n\n\t\tif ( opsDiffB < opsDiffA ) {\n\t\t\tpadWithNoOps( transformedDeltasB, opsDiffA - opsDiffB );\n\t\t} else if ( opsDiffA < opsDiffB ) {\n\t\t\tpadWithNoOps( transformedDeltasA, opsDiffB - opsDiffA );\n\t\t}\n\n\t\treturn { deltasA: transformedDeltasA, deltasB: transformedDeltasB };\n\t}\n};\n\nexport default transform;\n\n// Updates base versions of operations inside deltas (which are the results of delta transformation).\nfunction updateBaseVersion( baseVersion, deltas ) {\n\tfor ( const delta of deltas ) {\n\t\tfor ( const op of delta.operations ) {\n\t\t\top.baseVersion = ++baseVersion;\n\t\t}\n\t}\n\n\treturn deltas;\n}\n\n// Returns number of operations in given array of deltas.\nfunction getOpsCount( deltas ) {\n\treturn deltas.reduce( ( current, delta ) => {\n\t\treturn current + delta.operations.length;\n\t}, 0 );\n}\n\n// Adds a delta containing `howMany` `NoOperation` instances to given array with deltas.\n// Used to \"synchronize\" the number of operations in two delta sets.\nfunction padWithNoOps( deltas, howMany ) {\n\tconst lastDelta = deltas[ deltas.length - 1 ];\n\tlet baseVersion = lastDelta.operations.length + lastDelta.baseVersion;\n\n\tconst noDelta = new Delta();\n\n\tfor ( let i = 0; i < howMany; i++ ) {\n\t\tnoDelta.addOperation( new NoOperation( baseVersion++ ) );\n\t}\n\n\tdeltas.push( noDelta );\n}\n\n// Sets context data before delta `a` by delta `b` transformation.\n// Using data given in `context` object, sets `context.insertBefore` and `context.forceNotSticky` flags.\n// Also updates `context.wasAffected`.\nfunction _setContext( a, b, context ) {\n\t_setWasAffected( a, b, context );\n\t_setInsertBeforeContext( a, b, context );\n\t_setForceWeakRemove( b, context );\n\t_setForceNotSticky( b, context );\n}\n\n// Sets `context.insertBefore` basing on `context.document` history for `a` by `b` transformation.\n//\n// Simply saying, if `b` is \"undoing delta\" it means that `a` might already be transformed by the delta\n// which was undone by `b` (let's call it `oldB`). If this is true, `a` by `b` transformation has to consider\n// how `a` was transformed by `oldB` to get an expected result.\n//\n// This is used to resolve conflict when two operations want to insert nodes at the same position. If the operations\n// are not related, it doesn't matter in what order operations insert those nodes. However if the operations are\n// related (for example, in undo) we need to keep the same order.\n//\n// For example, assume that editor has two letters: 'ab'. Then, both letters are removed, creating two operations:\n// (op. 1) REM [ 1 ] - [ 2 ] => (graveyard) [ 0 ]\n// (op. 2) REM [ 0 ] - [ 1 ] => (graveyard) [ 1 ]\n// Then, we undo operation 2:\n// REM [ 0 ] - [ 1 ] => (graveyard) [ 1 ] is reversed to REI (graveyard) [ 1 ] => [ 0 ] - [ 1 ] and is applied.\n// History stack is:\n// (op. 1) REM [ 1 ] - [ 2 ] => (graveyard) [ 0 ]\n// (op. 2) REM [ 0 ] - [ 1 ] => (graveyard) [ 1 ]\n// (op. 3) REI (graveyard) [ 1 ] => [ 0 ] - [ 1 ]\n// Then, we undo operation 1:\n// REM [ 1 ] - [ 2 ] => (graveyard) [ 0 ] is reversed to REI (graveyard) [ 0 ] => [ 1 ] - [ 2 ] then,\n// is transformed by (op. 2) REM [ 0 ] - [ 1 ] => (graveyard) [ 1 ] and becomes REI (graveyard) [ 0 ] => [ 0 ] - [ 1 ] then,\n// is transformed by (op. 3) REI (graveyard) [ 1 ] => [ 0 ] - [ 1 ] and we have a conflict because both operations\n// insert at the same position, but thanks to keeping the context, we know that in this case, the transformed operation should\n// insert the node after operation 3.\n//\n// Keep in mind, that `context.insertBefore` may be either `Boolean` or `undefined`. If it is `Boolean` then the order is\n// known (deltas are related and `a` should insert nodes before or after `b`). However, if deltas were not related,\n// `context.isBefore` is `undefined` and other factors will be taken into consideration when resolving the order\n// (this, however, happens in operational transformation algorithms).\n//\n// This affects both `MoveOperation` (and its derivatives) and `InsertOperation`.\nfunction _setInsertBeforeContext( a, b, context ) {\n\t// If `b` is a delta that undoes other delta...\n\tconst originalDelta = context.originalDelta.get( b );\n\n\tif ( context.document.history.isUndoingDelta( originalDelta ) ) {\n\t\t// Get the undone delta...\n\t\tconst undoneDelta = context.document.history.getUndoneDelta( originalDelta );\n\t\t// Get a map with deltas related to `a` delta...\n\t\tconst aWasAffectedBy = context.wasAffected.get( a );\n\t\t// And check if the undone delta is related with delta `a`.\n\t\tconst affected = aWasAffectedBy.get( undoneDelta );\n\n\t\tif ( affected !== undefined ) {\n\t\t\t// If deltas are related, set `context.insertBefore` basing on whether `a` was affected by the undone delta.\n\t\t\tcontext.insertBefore = affected;\n\t\t}\n\t}\n}\n\n// Sets `context.forceNotSticky` basing on `context.document` history for transformation by `b` delta.\n//\n// `MoveOperation` may be \"sticky\" which means, that anything that was inserted at the boundary of moved range, should\n// also be moved. This is particularly helpful for actions like splitting or merging a node. However, this behavior\n// sometimes leads to an error, for example in undo.\n//\n// Simply saying, if delta is going to be transformed by delta `b`, stickiness should not be taken into consideration\n// if delta `b` was already undone or if delta `b` is an undoing delta.\n//\n// This affects `MoveOperation` (and its derivatives).\nfunction _setForceNotSticky( b, context ) {\n\tconst originalDelta = context.originalDelta.get( b );\n\tconst history = context.document.history;\n\n\tcontext.forceNotSticky = history.isUndoneDelta( originalDelta ) || history.isUndoingDelta( originalDelta );\n}\n\n// Sets `context.forceWeakRemove` basing on `context.document` history for transformation by `b` delta.\n//\n// When additional context is not used, default `MoveOperation` x `RemoveOperation` transformation\n// always treats `RemoveOperation` as a stronger one, no matter how `context.isStrong` is set. It is like this\n// to provide better results when transformations happen.\n//\n// This, however, works fine only when additional context is not used.\n//\n// When additional context is used, we need a better way to decide whether `RemoveOperation` is \"dominating\" (or in other\n// words, whether nodes removed by given operation should stay in graveyard if other operation wants to move them).\n//\n// The answer to this is easy: if `RemoveOperation` has been already undone, we are not forcing given nodes to stay\n// in graveyard. In such scenario, we set `context.forceWeakRemove` to `true`. However, if the `RemoveOperation` has\n// not been undone, we set `context.forceWeakRemove` to `false` because we want the operation to be \"dominating\".\nfunction _setForceWeakRemove( b, context ) {\n\tconst history = context.document.history;\n\tconst originalB = context.originalDelta.get( b );\n\n\t// If `b` delta has not been undone yet, forceWeakRemove should be `false`.\n\t// It should be `true`, in any other case, if additional context is used.\n\tcontext.forceWeakRemove = history.isUndoneDelta( originalB );\n}\n\n// Sets `context.wasAffected` which holds context information about how transformed deltas are related. `context.wasAffected`\n// is used by `_setInsertBeforeContext` helper function.\nfunction _setWasAffected( a, b, context ) {\n\tif ( !context.wasAffected.get( a ) ) {\n\t\t// Create a new map with relations for `a` delta.\n\t\tcontext.wasAffected.set( a, new Map() );\n\t}\n\n\tconst originalDelta = context.originalDelta.get( b );\n\tlet wasAffected = !!context.wasAffected.get( a ).get( originalDelta );\n\n\t// Cross-check all operations from both deltas...\n\tfor ( const opA of a.operations ) {\n\t\tfor ( const opB of b.operations ) {\n\t\t\tif ( opA instanceof MoveOperation && opB instanceof MoveOperation ) {\n\t\t\t\tif ( _isOperationAffected( opA, opB ) ) {\n\t\t\t\t\t// If any of them are move operations that affect each other, set the relation accordingly.\n\t\t\t\t\twasAffected = true;\n\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Break both loops if affecting pair has been found.\n\t\tif ( wasAffected ) {\n\t\t\tbreak;\n\t\t}\n\t}\n\n\tcontext.wasAffected.get( a ).set( originalDelta, wasAffected );\n}\n\n// Checks whether `opA` is affected by `opB`. It is assumed that both operations are `MoveOperation`.\n// Operation is affected only if the other operation's source range is before that operation's source range.\nfunction _isOperationAffected( opA, opB ) {\n\tconst target = opA.targetPosition;\n\tconst source = opB.sourcePosition;\n\n\tconst cmpResult = compareArrays( source.getParentPath(), target.getParentPath() );\n\n\tif ( target.root != source.root ) {\n\t\treturn false;\n\t}\n\n\treturn cmpResult == 'same' && source.offset < target.offset;\n}\n\n// Updates `context` object after delta by delta transformation is done.\n//\n// This means two things:\n// 1. Some information are removed from context (those that apply only to the transformation that just happened).\n// 2. `context.wasAffected` is updated because `oldDelta` has been transformed to one or many `newDeltas` and we\n// need to update entries in `context.wasAffected`. Basically, anything that was in `context.wasAffected` under\n// `oldDelta` key should be rewritten to `newDeltas`. This way in next transformation steps, `newDeltas` \"remember\"\n// the context of `oldDelta`.\nfunction _updateContext( oldDelta, newDeltas, context ) {\n\tdelete context.insertBefore;\n\tdelete context.forceNotSticky;\n\tdelete context.forceWeakRemove;\n\n\tconst wasAffected = context.wasAffected.get( oldDelta );\n\n\tcontext.wasAffected.delete( oldDelta );\n\n\tfor ( const delta of newDeltas ) {\n\t\tcontext.wasAffected.set( delta, new Map( wasAffected ) );\n\t}\n}\n\n// Takes base delta class (`DeltaClass`) and a set of `operations` that are transformation results and creates\n// one or more deltas, acknowledging that the result is a transformation of a delta that is of `DeltaClass`.\n//\n// The normalization ensures that each delta has it's \"normal\" state, that is, for example, `MoveDelta` has\n// just one `MoveOperation`, `SplitDelta` has just two operations of which first is `InsertOperation` and second\n// is `MoveOperation` or `NoOperation`, etc.\nfunction getNormalizedDeltas( DeltaClass, operations ) {\n\tlet deltas = [];\n\tlet delta = null;\n\tlet attributeOperationIndex;\n\n\tswitch ( DeltaClass ) {\n\t\tcase MoveDelta:\n\t\tcase RemoveDelta:\n\t\t\t// Normal MoveDelta has just one MoveOperation.\n\t\t\t// Take all operations and create MoveDelta for each of them.\n\t\t\tfor ( const o of operations ) {\n\t\t\t\tif ( o instanceof NoOperation ) {\n\t\t\t\t\t// An operation may be instance of NoOperation and this may be correct.\n\t\t\t\t\t// If that's the case, do not create a MoveDelta with singular NoOperation.\n\t\t\t\t\t// Create \"no delta\" instead, that is Delta instance with NoOperation.\n\t\t\t\t\tdelta = new Delta();\n\t\t\t\t} else {\n\t\t\t\t\tif ( o instanceof RemoveOperation ) {\n\t\t\t\t\t\tdelta = new RemoveDelta();\n\t\t\t\t\t} else {\n\t\t\t\t\t\tdelta = new MoveDelta();\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tdelta.addOperation( o );\n\t\t\t\tdeltas.push( delta );\n\t\t\t}\n\n\t\t\t// Return all created MoveDeltas.\n\t\t\treturn deltas;\n\t\tcase SplitDelta:\n\t\tcase WrapDelta:\n\t\t\t// Normal SplitDelta and WrapDelta have two operations: first is InsertOperation and second is MoveOperation.\n\t\t\t// The MoveOperation may be split into multiple MoveOperations.\n\t\t\t// If that's the case, convert additional MoveOperations into MoveDeltas.\n\t\t\t// First, create normal SplitDelta or WrapDelta, using first two operations.\n\t\t\tdelta = new DeltaClass();\n\t\t\tdelta.addOperation( operations[ 0 ] );\n\t\t\tdelta.addOperation( operations[ 1 ] );\n\t\t\t// Then, take all but last two operations and use them to create normalized MoveDeltas.\n\t\t\tdeltas = getNormalizedDeltas( MoveDelta, operations.slice( 2 ) );\n\n\t\t\t// Return all deltas as one array, in proper order.\n\t\t\treturn [ delta ].concat( deltas );\n\t\tcase MergeDelta:\n\t\tcase UnwrapDelta:\n\t\t\t// Normal MergeDelta and UnwrapDelta have two operations: first is MoveOperation and second is RemoveOperation.\n\t\t\t// The MoveOperation may be split into multiple MoveOperations.\n\t\t\t// If that's the case, convert additional MoveOperations into MoveDeltas.\n\t\t\t// Take all but last two operations and use them to create normalized MoveDeltas.\n\t\t\tdeltas = getNormalizedDeltas( MoveDelta, operations.slice( 0, -2 ) );\n\t\t\t// Then, create normal MergeDelta or UnwrapDelta, using last two operations.\n\t\t\tdelta = new DeltaClass();\n\t\t\tdelta.addOperation( operations[ operations.length - 2 ] );\n\t\t\tdelta.addOperation( operations[ operations.length - 1 ] );\n\n\t\t\t// Return all deltas as one array, in proper order.\n\t\t\treturn deltas.concat( delta );\n\t\tcase RenameDelta:\n\t\t\t// RenameDelta may become a \"no delta\" if it's only operation is transformed to NoOperation.\n\t\t\t// This may happen when RenameOperation is transformed by RenameOperation.\n\t\t\t// Keep in mind that RenameDelta always have just one operation.\n\t\t\tif ( operations[ 0 ] instanceof NoOperation ) {\n\t\t\t\tdelta = new Delta();\n\t\t\t} else {\n\t\t\t\tdelta = new RenameDelta();\n\t\t\t}\n\n\t\t\tdelta.addOperation( operations[ 0 ] );\n\n\t\t\treturn [ delta ];\n\t\tcase AttributeDelta:\n\t\t\t// AttributeDelta is allowed to have multiple AttributeOperations and also NoOperations but\n\t\t\t// the first operation has to be an AttributeOperation as it is used as a reference for deltas properties.\n\t\t\t// Keep in mind that we cannot simply remove NoOperations cause that would mess up base versions.\n\t\t\t// Find an index of first operation that is not a NoOperation.\n\t\t\tfor ( attributeOperationIndex = 0; attributeOperationIndex < operations.length; attributeOperationIndex++ ) {\n\t\t\t\tif ( !( operations[ attributeOperationIndex ] instanceof NoOperation ) ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// No AttributeOperations has been found. Convert AttributeDelta to \"no delta\".\n\t\t\tif ( attributeOperationIndex == operations.length ) {\n\t\t\t\tdelta = new Delta();\n\t\t\t}\n\t\t\t// AttributeOperation found.\n\t\t\telse {\n\t\t\t\tdelta = new AttributeDelta();\n\n\t\t\t\t// AttributeOperation wasn't the first operation.\n\t\t\t\tif ( attributeOperationIndex != 0 ) {\n\t\t\t\t\t// Move AttributeOperation to the beginning.\n\t\t\t\t\toperations.unshift( operations.splice( attributeOperationIndex, 1 )[ 0 ] );\n\t\t\t\t\t// No need to update base versions - they are updated at the end of transformation algorithm anyway.\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add all operations to the delta (even if it is just a couple of NoOperations we have to keep them all).\n\t\t\tfor ( const o of operations ) {\n\t\t\t\tdelta.addOperation( o );\n\t\t\t}\n\n\t\t\treturn [ delta ];\n\t\tdefault:\n\t\t\t// For all other deltas no normalization is needed.\n\t\t\tdelta = new DeltaClass();\n\n\t\t\tfor ( const o of operations ) {\n\t\t\t\tdelta.addOperation( o );\n\t\t\t}\n\n\t\t\treturn [ delta ];\n\t}\n}\n\n/**\n * Object containing values and flags describing context of a transformation.\n *\n * @typedef {Object} module:engine/model/delta/transform~transformationContext\n * @property {Boolean} useAdditionalContext Whether additional context should be evaluated and used during transformations.\n * @property {Boolean} isStrong Whether transformed deltas are more (`true`) or less (`false`) important than deltas to transform by.\n * @property {module:engine/model/document~Document} [document] Model document which is a context for transformations.\n * Available only if `useAdditionalContext` is `true`.\n * @property {Boolean|undefined} forceWeakRemove Whether {@link module:engine/model/operation/removeoperation~RemoveOperation}\n * should be always more important than other operations. Available only if `useAdditionalContext` is `true`.\n * @property {Boolean|undefined} insertBefore Used when transforming {@link module:engine/model/operation/moveoperation~MoveOperation}s\n * If two `MoveOperation`s target to the same position, `insertBefore` is used to resolve such conflict. This flag\n * is set and used internally by transformation algorithms. Available only if `useAdditionalContext` is `true`.\n * @property {Boolean|undefined} forceNotSticky Used when transforming\n * {@link module:engine/model/operation/moveoperation~MoveOperation#isSticky sticky MoveOperation}. If set to `true`,\n * `isSticky` flag is discarded during transformations. This flag is set and used internally by transformation algorithms.\n * Available only if `useAdditionalContext` is `true`.\n * @property {Map|undefined} wasAffected Used to evaluate `insertBefore` flag. This map is set and used internally by\n * transformation algorithms. Available only if `useAdditionalContext` is `true`.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/markerdelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, the {@link module:engine/model/writer~Writer#addMarker Writer#addMarker}\n * and {@link module:engine/model/writer~Writer#removeMarker Writer#removeMarker} methods use the `MarkerDelta` class which inherits\n * from the `Delta` class and may overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class MarkerDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'marker';\n\t}\n\n\t/**\n\t * A class that will be used when creating reversed delta.\n\t *\n\t * @private\n\t * @type {Function}\n\t */\n\tget _reverseDeltaClass() {\n\t\treturn MarkerDelta;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.MarkerDelta';\n\t}\n}\n\nDeltaFactory.register( MarkerDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/basic-transformations\n */\n\nimport deltaTransform from './transform';\nconst addTransformationCase = deltaTransform.addTransformationCase;\nconst defaultTransform = deltaTransform.defaultTransform;\n\nimport Range from '../range';\nimport Position from '../position';\n\nimport NoOperation from '../operation/nooperation';\nimport AttributeOperation from '../operation/attributeoperation';\nimport InsertOperation from '../operation/insertoperation';\nimport ReinsertOperation from '../operation/reinsertoperation';\n\nimport Delta from './delta';\nimport AttributeDelta from './attributedelta';\nimport InsertDelta from './insertdelta';\nimport MarkerDelta from './markerdelta';\nimport MergeDelta from './mergedelta';\nimport MoveDelta from './movedelta';\nimport SplitDelta from './splitdelta';\nimport WeakInsertDelta from './weakinsertdelta';\nimport WrapDelta from './wrapdelta';\nimport UnwrapDelta from './unwrapdelta';\nimport RenameDelta from './renamedelta';\nimport RemoveDelta from './removedelta';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n// Provide transformations for default deltas.\n\n// Add special case for AttributeDelta x WeakInsertDelta transformation.\naddTransformationCase( AttributeDelta, WeakInsertDelta, ( a, b, context ) => {\n\t// If nodes are weak-inserted into attribute delta range, we need to apply changes from attribute delta on them.\n\t// So first we do the normal transformation and if this special cases happens, we will add an extra delta.\n\tconst deltas = defaultTransform( a, b, context );\n\n\tif ( a.range.containsPosition( b.position ) ) {\n\t\tdeltas.push( _getComplementaryAttrDelta( b, a ) );\n\t}\n\n\treturn deltas;\n} );\n\n// Add special case for AttributeDelta x SplitDelta transformation.\naddTransformationCase( AttributeDelta, SplitDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tconst undoMode = context.undoMode;\n\tconst splitPosition = new Position( b.position.root, b.position.path.slice( 0, -1 ) );\n\n\tconst deltas = defaultTransform( a, b, context );\n\n\t// Special case applies only if undo is not a context and only if `SplitDelta` has `InsertOperation` (not `ReinsertOperation`).\n\tif ( undoMode || !( b._cloneOperation instanceof InsertOperation ) ) {\n\t\treturn deltas;\n\t}\n\n\tfor ( const operation of a.operations ) {\n\t\t// If a node that has been split has it's attribute updated, we should also update attribute of\n\t\t// the node created during splitting.\n\t\tif ( operation.range.containsPosition( splitPosition ) || operation.range.start.isEqual( splitPosition ) ) {\n\t\t\tconst additionalAttributeDelta = new AttributeDelta();\n\n\t\t\tconst rangeStart = splitPosition.getShiftedBy( 1 );\n\t\t\tconst rangeEnd = Position.createFromPosition( rangeStart );\n\t\t\trangeEnd.path.push( 0 );\n\n\t\t\tconst oldValue = b._cloneOperation.nodes.getNode( 0 ).getAttribute( operation.key );\n\n\t\t\tadditionalAttributeDelta.addOperation( new AttributeOperation(\n\t\t\t\tnew Range( rangeStart, rangeEnd ),\n\t\t\t\toperation.key,\n\t\t\t\toldValue === undefined ? null : oldValue,\n\t\t\t\toperation.newValue,\n\t\t\t\t0\n\t\t\t) );\n\n\t\t\tdeltas.push( additionalAttributeDelta );\n\n\t\t\tbreak;\n\t\t}\n\t}\n\n\treturn deltas;\n} );\n\n// Add special case for InsertDelta x MergeDelta transformation.\naddTransformationCase( InsertDelta, MergeDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `MergeDelta` has `NoOperation` as the second operation.\n\tif ( !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tconst undoMode = context.undoMode;\n\n\t// If insert is applied at the same position where merge happened, we reverse the merge (we treat it like it\n\t// didn't happen) and then apply the original insert operation. This is \"mirrored\" in MergeDelta x InsertDelta\n\t// transformation below, where we simply do not apply MergeDelta.\n\tif ( !undoMode && a.position.isEqual( b.position ) ) {\n\t\treturn [\n\t\t\tb.getReversed(),\n\t\t\ta.clone()\n\t\t];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\nfunction transformMarkerDelta( a, b ) {\n\tconst transformedDelta = a.clone();\n\tconst transformedOp = transformedDelta.operations[ 0 ];\n\n\tif ( transformedOp.oldRange ) {\n\t\ttransformedOp.oldRange = transformedOp.oldRange.getTransformedByDelta( b )[ 0 ];\n\t}\n\n\tif ( transformedOp.newRange ) {\n\t\ttransformedOp.newRange = transformedOp.newRange.getTransformedByDelta( b )[ 0 ];\n\t}\n\n\treturn [ transformedDelta ];\n}\n\naddTransformationCase( MarkerDelta, SplitDelta, transformMarkerDelta );\naddTransformationCase( MarkerDelta, MergeDelta, transformMarkerDelta );\naddTransformationCase( MarkerDelta, WrapDelta, transformMarkerDelta );\naddTransformationCase( MarkerDelta, UnwrapDelta, transformMarkerDelta );\naddTransformationCase( MarkerDelta, MoveDelta, transformMarkerDelta );\naddTransformationCase( MarkerDelta, RenameDelta, transformMarkerDelta );\n\n// Add special case for MoveDelta x MergeDelta transformation.\naddTransformationCase( MoveDelta, MergeDelta, ( a, b, context ) => {\n\tconst undoMode = context.undoMode;\n\n\t// Do not apply special transformation case in undo mode or if `MergeDelta` has `NoOperation` as the second operation.\n\tif ( undoMode || !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If move delta is supposed to move a node that has been merged, we reverse the merge (we treat it like it\n\t// didn't happen) and then apply the original move operation. This is \"mirrored\" in MergeDelta x MoveDelta\n\t// transformation below, where we simply do not apply MergeDelta.\n\tconst operateInSameParent =\n\t\ta.sourcePosition.root == b.position.root &&\n\t\tcompareArrays( a.sourcePosition.getParentPath(), b.position.getParentPath() ) === 'same';\n\n\tconst mergeInsideMoveRange = a.sourcePosition.offset <= b.position.offset && a.sourcePosition.offset + a.howMany > b.position.offset;\n\n\tif ( operateInSameParent && mergeInsideMoveRange ) {\n\t\treturn [\n\t\t\tb.getReversed(),\n\t\t\ta.clone()\n\t\t];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for MergeDelta x InsertDelta transformation.\naddTransformationCase( MergeDelta, InsertDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `MergeDelta` has `NoOperation` as the second operation.\n\tif ( !a.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tconst undoMode = context.undoMode;\n\n\t// If merge is applied at the same position where we inserted a range of nodes we cancel the merge as it's results\n\t// may be unexpected and very weird. Even if we do some \"magic\" we don't know what really are users' expectations.\n\tif ( !undoMode && a.position.isEqual( b.position ) ) {\n\t\treturn [ noDelta() ];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for MergeDelta x MoveDelta transformation.\naddTransformationCase( MergeDelta, MoveDelta, ( a, b, context ) => {\n\tconst undoMode = context.undoMode;\n\n\t// Do not apply special transformation case in undo mode or if `MergeDelta` has `NoOperation` as the second operation.\n\tif ( undoMode || !a.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If merge is applied at the position between moved nodes we cancel the merge as it's results may be unexpected and\n\t// very weird. Even if we do some \"magic\" we don't know what really are users' expectations.\n\tconst operateInSameParent =\n\t\ta.position.root == b.sourcePosition.root &&\n\t\tcompareArrays( a.position.getParentPath(), b.sourcePosition.getParentPath() ) === 'same';\n\n\tconst mergeInsideMoveRange = b.sourcePosition.offset <= a.position.offset && b.sourcePosition.offset + b.howMany > a.position.offset;\n\n\tif ( operateInSameParent && mergeInsideMoveRange ) {\n\t\treturn [ noDelta() ];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\naddTransformationCase( SplitDelta, SplitDelta, ( a, b, context ) => {\n\tconst undoMode = context.undoMode;\n\n\t// Do not apply special transformation case if transformation is in undo mode.\n\tif ( undoMode ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !a.position || !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tconst pathA = a.position.getParentPath();\n\tconst pathB = b.position.getParentPath();\n\n\t// The special case is for splits inside the same parent.\n\tif ( a.position.root == b.position.root && compareArrays( pathA, pathB ) == 'same' ) {\n\t\ta = a.clone();\n\n\t\tif ( a.position.offset < b.position.offset || ( a.position.offset == b.position.offset && context.isStrong ) ) {\n\t\t\t// If both first operations are `ReinsertOperation`s, we might need to transform `a._cloneOperation`,\n\t\t\t// so it will take correct node from graveyard.\n\t\t\tif (\n\t\t\t\ta._cloneOperation instanceof ReinsertOperation && b._cloneOperation instanceof ReinsertOperation &&\n\t\t\t\ta._cloneOperation.sourcePosition.offset > b._cloneOperation.sourcePosition.offset\n\t\t\t) {\n\t\t\t\ta._cloneOperation.sourcePosition.offset--;\n\t\t\t}\n\n\t\t\t// `a` splits closer or at same offset.\n\t\t\t// Change how many nodes are moved. Do not move nodes that were moved by delta `b`.\n\t\t\tconst aRange = Range.createFromPositionAndShift( a.position, a._moveOperation.howMany );\n\t\t\tconst bRange = Range.createFromPositionAndShift( b.position, b._moveOperation.howMany );\n\n\t\t\tconst diff = aRange.getDifference( bRange );\n\n\t\t\tlet newHowMany = 0;\n\n\t\t\tfor ( const range of diff ) {\n\t\t\t\tnewHowMany += range.end.offset - range.start.offset;\n\t\t\t}\n\n\t\t\tif ( newHowMany === 0 ) {\n\t\t\t\ta.operations.pop(); // Remove last operation (`MoveOperation`).\n\t\t\t\ta.addOperation( new NoOperation( a.operations[ 0 ].baseVersion + 1 ) ); // Add `NoOperation` instead.\n\t\t\t} else {\n\t\t\t\ta.operations[ 1 ].howMany = newHowMany;\n\t\t\t}\n\n\t\t\treturn [ a ];\n\t\t} else {\n\t\t\t// `a` splits further.\n\t\t\t// This is more complicated case, thankfully we can solve it using default transformation and setting proper context.\n\t\t\tconst newContext = Object.assign( {}, context );\n\t\t\tnewContext.isStrong = true;\n\t\t\tnewContext.insertBefore = true;\n\n\t\t\treturn defaultTransform( a, b, newContext );\n\t\t}\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for SplitDelta x UnwrapDelta transformation.\naddTransformationCase( SplitDelta, UnwrapDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !a.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If incoming split delta tries to split a node that just got unwrapped, there is actually nothing to split,\n\t// so we discard that delta.\n\tif ( a.position.root == b.position.root && compareArrays( b.position.path, a.position.getParentPath() ) === 'same' ) {\n\t\treturn [ noDelta() ];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for SplitDelta x WrapDelta transformation.\naddTransformationCase( SplitDelta, WrapDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !a.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If split is applied at the position between wrapped nodes, we cancel the split as it's results may be unexpected and\n\t// very weird. Even if we do some \"magic\" we don't know what really are users' expectations.\n\n\tconst sameRoot = a.position.root == b.range.start.root;\n\tconst operateInSameParent = sameRoot && compareArrays( a.position.getParentPath(), b.range.start.getParentPath() ) === 'same';\n\tconst splitInsideWrapRange = b.range.start.offset < a.position.offset && b.range.end.offset >= a.position.offset;\n\n\tif ( operateInSameParent && splitInsideWrapRange ) {\n\t\treturn [ noDelta() ];\n\t} else if ( sameRoot && compareArrays( a.position.getParentPath(), b.range.end.getShiftedBy( -1 ).path ) === 'same' ) {\n\t\t// Split position is directly inside the last node from wrap range.\n\t\t// If that's the case, we manually change split delta so it will \"target\" inside the wrapping element.\n\t\t// By doing so we will be inserting split node right to the original node which feels natural and is a good UX.\n\t\tconst delta = a.clone();\n\n\t\t// 1. Fix insert operation position.\n\t\t// Node to split is the last children of the wrapping element.\n\t\t// Wrapping element is the element inserted by WrapDelta (re)insert operation.\n\t\t// It is inserted after the wrapped range, but the wrapped range will be moved inside it.\n\t\t// Having this in mind, it is correct to use wrapped range start position as the position before wrapping element.\n\t\tconst splitNodePos = Position.createFromPosition( b.range.start );\n\t\t// Now, `splitNodePos` points before wrapping element.\n\t\t// To get a position before last children of that element, we expand position's `path` member by proper offset.\n\t\tsplitNodePos.path.push( b.howMany - 1 );\n\n\t\t// SplitDelta insert operation position should be right after the node we split.\n\t\tconst insertPos = splitNodePos.getShiftedBy( 1 );\n\t\tdelta._cloneOperation.position = insertPos;\n\n\t\t// 2. Fix move operation source position.\n\t\t// Nodes moved by SplitDelta will be moved from new position, modified by WrapDelta.\n\t\t// To obtain that new position, `splitNodePos` will be used, as this is the node we are extracting children from.\n\t\tconst sourcePos = Position.createFromPosition( splitNodePos );\n\t\t// Nothing changed inside split node so it is correct to use the original split position offset.\n\t\tsourcePos.path.push( a.position.offset );\n\t\tdelta._moveOperation.sourcePosition = sourcePos;\n\n\t\t// 3. Fix move operation target position.\n\t\t// SplitDelta move operation target position should be inside the node inserted by operation above.\n\t\t// Since the node is empty, we will insert at offset 0.\n\t\tconst targetPos = Position.createFromPosition( insertPos );\n\t\ttargetPos.path.push( 0 );\n\t\tdelta._moveOperation.targetPosition = targetPos;\n\n\t\treturn [ delta ];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for SplitDelta x WrapDelta transformation.\naddTransformationCase( SplitDelta, AttributeDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !a.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\ta = a.clone();\n\n\tconst undoMode = context.undoMode;\n\tconst splitPosition = new Position( a.position.root, a.position.path.slice( 0, -1 ) );\n\n\t// Special case applies only if undo is not a context and only if `SplitDelta` has `InsertOperation` (not `ReinsertOperation`).\n\tif ( undoMode || !( a._cloneOperation instanceof InsertOperation ) ) {\n\t\treturn [ a ];\n\t}\n\n\t// If element to split had it's attribute changed, we have to reflect this change in an element\n\t// that is in SplitDelta's InsertOperation.\n\tfor ( const operation of b.operations ) {\n\t\tif ( operation.range.containsPosition( splitPosition ) || operation.range.start.isEqual( splitPosition ) ) {\n\t\t\tif ( operation.newValue !== null ) {\n\t\t\t\ta._cloneOperation.nodes.getNode( 0 )._setAttribute( operation.key, operation.newValue );\n\t\t\t} else {\n\t\t\t\ta._cloneOperation.nodes.getNode( 0 )._removeAttribute( operation.key );\n\t\t\t}\n\n\t\t\tbreak;\n\t\t}\n\t}\n\n\treturn [ a ];\n} );\n\n// Add special case for UnwrapDelta x SplitDelta transformation.\naddTransformationCase( UnwrapDelta, SplitDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If incoming unwrap delta tries to unwrap node that got split we should unwrap the original node and the split copy.\n\t// This can be achieved either by reverting split and applying unwrap to singular node, or creating additional unwrap delta.\n\tif ( a.position.root == b.position.root && compareArrays( a.position.path, b.position.getParentPath() ) === 'same' ) {\n\t\treturn [\n\t\t\tb.getReversed(),\n\t\t\ta.clone()\n\t\t];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for WeakInsertDelta x AttributeDelta transformation.\naddTransformationCase( WeakInsertDelta, AttributeDelta, ( a, b ) => {\n\t// If nodes are weak-inserted into attribute delta range, we need to apply changes from attribute delta on them.\n\tconst deltas = [ a.clone() ];\n\n\tif ( b.range.containsPosition( a.position ) ) {\n\t\tdeltas.push( _getComplementaryAttrDelta( a, b ) );\n\t}\n\n\treturn deltas;\n} );\n\n// Add special case for WrapDelta x SplitDelta transformation.\naddTransformationCase( WrapDelta, SplitDelta, ( a, b, context ) => {\n\t// Do not apply special transformation case if `SplitDelta` has `NoOperation` as the second operation.\n\tif ( !b.position ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// If incoming wrap delta tries to wrap range that contains split position, we have to cancel the split and apply\n\t// the wrap. Since split was already applied, we have to revert it.\n\tconst sameRoot = a.range.start.root == b.position.root;\n\tconst operateInSameParent = sameRoot && compareArrays( a.range.start.getParentPath(), b.position.getParentPath() ) === 'same';\n\tconst splitInsideWrapRange = a.range.start.offset < b.position.offset && a.range.end.offset >= b.position.offset;\n\n\tif ( operateInSameParent && splitInsideWrapRange ) {\n\t\treturn [\n\t\t\tb.getReversed(),\n\t\t\ta.clone()\n\t\t];\n\t} else if ( sameRoot && compareArrays( b.position.getParentPath(), a.range.end.getShiftedBy( -1 ).path ) === 'same' ) {\n\t\tconst delta = a.clone();\n\n\t\t// Move wrapping element insert position one node further so it is after the split node insertion.\n\t\tdelta._insertOperation.position.offset++;\n\n\t\t// Include the split node copy.\n\t\tdelta._moveOperation.howMany++;\n\n\t\t// Change the path to wrapping element in move operation.\n\t\tdelta._moveOperation.targetPosition.path[ delta._moveOperation.targetPosition.path.length - 2 ]++;\n\n\t\treturn [ delta ];\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Add special case for RenameDelta x SplitDelta transformation.\naddTransformationCase( RenameDelta, SplitDelta, ( a, b, context ) => {\n\tconst undoMode = context.undoMode;\n\tconst deltas = defaultTransform( a, b, context );\n\n\t// Special case applies only if undo is not a context and only if `SplitDelta` has `InsertOperation` (not `ReinsertOperation`).\n\tif ( undoMode || !( b._cloneOperation instanceof InsertOperation ) ) {\n\t\treturn deltas;\n\t}\n\n\tconst insertPosition = b._cloneOperation.position.getShiftedBy( -1 );\n\n\tif ( insertPosition && a.operations[ 0 ].position.isEqual( insertPosition ) ) {\n\t\t// If a node that has been split has it's name changed, we should also change name of\n\t\t// the node created during splitting.\n\t\tconst additionalRenameDelta = a.clone();\n\t\tadditionalRenameDelta.operations[ 0 ].position = insertPosition.getShiftedBy( 1 );\n\n\t\tdeltas.push( additionalRenameDelta );\n\t}\n\n\treturn deltas;\n} );\n\n// Add special case for SplitDelta x RenameDelta transformation.\naddTransformationCase( SplitDelta, RenameDelta, ( a, b, context ) => {\n\ta = a.clone();\n\n\tconst undoMode = context.undoMode;\n\n\t// Special case applies only if undo is not a context and only if `SplitDelta` has `InsertOperation` (not `ReinsertOperation`).\n\tif ( undoMode || !( a._cloneOperation instanceof InsertOperation ) ) {\n\t\treturn [ a ];\n\t}\n\n\tconst insertPosition = a._cloneOperation.position.getShiftedBy( -1 );\n\n\t// If element to split had it's name changed, we have to reflect this by creating additional rename operation.\n\tif ( insertPosition && !undoMode && b.operations[ 0 ].position.isEqual( insertPosition ) ) {\n\t\tconst additionalRenameDelta = b.clone();\n\t\tadditionalRenameDelta.operations[ 0 ].position = insertPosition.getShiftedBy( 1 );\n\t\tadditionalRenameDelta.operations[ 0 ].oldName = a._cloneOperation.nodes.getNode( 0 ).name;\n\n\t\treturn [ a, additionalRenameDelta ];\n\t}\n\n\treturn [ a ];\n} );\n\n// Add special case for RemoveDelta x SplitDelta transformation.\naddTransformationCase( RemoveDelta, SplitDelta, ( a, b, context ) => {\n\tconst deltas = defaultTransform( a, b, context );\n\t// The \"clone operation\" may be InsertOperation, ReinsertOperation, MoveOperation or NoOperation.\n\tconst insertPosition = b._cloneOperation.position || b._cloneOperation.targetPosition;\n\n\t// NoOperation.\n\tif ( !insertPosition ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tconst undoMode = context.undoMode;\n\n\t// Special case applies only if undo is not a context.\n\tif ( undoMode ) {\n\t\treturn deltas;\n\t}\n\n\t// In case if `defaultTransform` returned more than one delta.\n\tfor ( const delta of deltas ) {\n\t\t// \"No delta\" may be returned in some cases.\n\t\tif ( delta instanceof RemoveDelta ) {\n\t\t\tconst operation = delta._moveOperation;\n\t\t\tconst rangeEnd = operation.sourcePosition.getShiftedBy( operation.howMany );\n\n\t\t\tif ( rangeEnd.isEqual( insertPosition ) ) {\n\t\t\t\toperation.howMany += 1;\n\t\t\t}\n\t\t}\n\t}\n\n\treturn deltas;\n} );\n\n// Add special case for SplitDelta x RemoveDelta transformation.\naddTransformationCase( SplitDelta, RemoveDelta, ( a, b, context ) => {\n\tconst undoMode = context.undoMode;\n\n\t// Special case applies only if undo is not a context.\n\tif ( undoMode ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\t// This case is very trickily solved.\n\t// Instead of fixing `a` delta, we change `b` delta for a while and fire default transformation with fixed `b` delta.\n\t// Thanks to that fixing `a` delta will be differently (correctly) transformed.\n\t//\n\t// The \"clone operation\" may be InsertOperation, ReinsertOperation, MoveOperation or NoOperation.\n\tconst insertPosition = a._cloneOperation.position || a._cloneOperation.targetPosition;\n\n\t// NoOperation.\n\tif ( !insertPosition ) {\n\t\treturn defaultTransform( a, b, context );\n\t}\n\n\tb = b.clone();\n\tconst operation = b._moveOperation;\n\tconst rangeEnd = operation.sourcePosition.getShiftedBy( operation.howMany );\n\n\tif ( rangeEnd.isEqual( insertPosition ) ) {\n\t\toperation.howMany += 1;\n\t}\n\n\treturn defaultTransform( a, b, context );\n} );\n\n// Helper function for `AttributeDelta` class transformations.\n// Creates an attribute delta that sets attribute from given `attributeDelta` on nodes from given `weakInsertDelta`.\nfunction _getComplementaryAttrDelta( weakInsertDelta, attributeDelta ) {\n\tconst complementaryAttrDelta = new AttributeDelta();\n\tconst nodes = weakInsertDelta.nodes;\n\n\t// At the beginning we store the attribute value from the first node on `weakInsertDelta` node list.\n\tlet val = nodes.getNode( 0 ).getAttribute( attributeDelta.key );\n\n\t// This stores the last index of `weakInsertDelta` node list where the attribute value was different\n\t// than in the previous node. We need it to create separate `AttributeOperation`s for nodes with different attributes.\n\tlet lastOffset = 0;\n\t// Sum of offsets of already processed nodes.\n\tlet offsetSum = nodes.getNode( 0 ).offsetSize;\n\n\tfor ( let i = 1; i < nodes.length; i++ ) {\n\t\tconst node = nodes.getNode( i );\n\t\tconst nodeAttrVal = node.getAttribute( attributeDelta.key );\n\n\t\t// If previous node has different attribute value, we will create an operation to the point before current node.\n\t\t// So all nodes with the same attributes up to this point will be included in one `AttributeOperation`.\n\t\tif ( nodeAttrVal != val ) {\n\t\t\t// New operation is created only when it is needed. If given node already has proper value for this\n\t\t\t// attribute we simply skip it without adding a new operation.\n\t\t\tif ( val != attributeDelta.value ) {\n\t\t\t\taddOperation();\n\t\t\t}\n\n\t\t\tval = nodeAttrVal;\n\t\t\tlastOffset = offsetSum;\n\t\t}\n\n\t\toffsetSum = offsetSum + node.offsetSize;\n\t}\n\n\t// At the end we have to add additional `AttributeOperation` for the last part of node list. If all nodes on the\n\t// node list had same attributes, this will be the only operation added to the delta.\n\taddOperation();\n\n\treturn complementaryAttrDelta;\n\n\tfunction addOperation() {\n\t\tconst range = new Range(\n\t\t\tweakInsertDelta.position.getShiftedBy( lastOffset ),\n\t\t\tweakInsertDelta.position.getShiftedBy( offsetSum )\n\t\t);\n\n\t\tconst attrOperation = new AttributeOperation( range, attributeDelta.key, val, attributeDelta.value, 0 );\n\t\tcomplementaryAttrDelta.addOperation( attrOperation );\n\t}\n}\n\n// This is \"no-op\" delta, it has no type and only no-operation, it basically does nothing.\n// It is used when we don't want to apply changes but still we need to return a delta.\nfunction noDelta() {\n\tconst noDelta = new Delta();\n\n\t// BaseVersion will be fixed later anyway.\n\tnoDelta.addOperation( new NoOperation( 0 ) );\n\n\treturn noDelta;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/batch\n */\n\n/**\n * A batch instance groups model changes ({@link module:engine/model/delta/delta~Delta deltas}). All deltas grouped in a single batch\n * can be reverted together, so you can think about a batch as of a single undo step. If you want to extend a given undo step, you\n * can add more changes to the batch using {@link module:engine/model/model~Model#enqueueChange}:\n *\n *\t\tmodel.enqueueChange( batch, writer => {\n *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n *\t\t} );\n *\n * @see module:engine/model/model~Model#enqueueChange\n * @see module:engine/model/model~Model#change\n */\nexport default class Batch {\n\t/**\n\t * Creates a batch instance.\n\t *\n\t * @see module:engine/model/model~Model#enqueueChange\n\t * @see module:engine/model/model~Model#change\n\t * @param {'transparent'|'default'} [type='default'] The type of the batch.\n\t */\n\tconstructor( type = 'default' ) {\n\t\t/**\n\t\t * An array of deltas that compose this batch.\n\t\t *\n\t\t * @readonly\n\t\t * @type {Array.<module:engine/model/delta/delta~Delta>}\n\t\t */\n\t\tthis.deltas = [];\n\n\t\t/**\n\t\t * The type of the batch.\n\t\t *\n\t\t * It can be one of the following values:\n\t\t * * `'default'` &ndash; All \"normal\" batches. This is the most commonly used type.\n\t\t * * `'transparent'` &ndash; A batch that should be ignored by other features, i.e. an initial batch or collaborative editing\n\t\t * changes.\n\t\t *\n\t\t * @readonly\n\t\t * @type {'transparent'|'default'}\n\t\t */\n\t\tthis.type = type;\n\t}\n\n\t/**\n\t * Returns the base version of this batch, which is equal to the base version of the first delta (which has the base version set)\n\t * in the batch. If there are no deltas in the batch or neither delta has the base version set, it returns `null`.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget baseVersion() {\n\t\tfor ( const delta of this.deltas ) {\n\t\t\tif ( delta.baseVersion !== null ) {\n\t\t\t\treturn delta.baseVersion;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Adds a delta to the batch instance. All modification methods (insert, remove, split, etc.) use this method\n\t * to add created deltas.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} delta A delta to add.\n\t * @returns {module:engine/model/delta/delta~Delta} An added delta.\n\t */\n\taddDelta( delta ) {\n\t\tdelta.batch = this;\n\t\tthis.deltas.push( delta );\n\n\t\treturn delta;\n\t}\n\n\t/**\n\t * Gets an iterable collection of operations.\n\t *\n\t * @returns {Iterable.<module:engine/model/operation/operation~Operation>}\n\t */\n\t* getOperations() {\n\t\tfor ( const delta of this.deltas ) {\n\t\t\tyield* delta.operations;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/delta/rootattributedelta\n */\n\nimport Delta from './delta';\nimport DeltaFactory from './deltafactory';\n\n/**\n * To provide specific OT behavior and better collisions solving, methods to change attributes\n * ({@link module:engine/model/writer~Writer#setAttribute} and {@link module:engine/model/writer~Writer#removeAttribute})\n * use `RootAttributeDelta` class which inherits from the `Delta` class and may\n * overwrite some methods.\n *\n * @extends module:engine/model/delta/delta~Delta\n */\nexport default class RootAttributeDelta extends Delta {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.delta.RootAttributeDelta';\n\t}\n}\n\nDeltaFactory.register( RootAttributeDelta );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/operation/detachoperation\n */\n\nimport Operation from './operation';\nimport Position from '../position';\nimport Range from '../range';\nimport { _remove } from './utils';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Operation to permanently remove node from detached root.\n * Note this operation is only a local operation and won't be send to the other clients.\n *\n * @extends module:engine/model/operation/operation~Operation\n */\nexport default class DetachOperation extends Operation {\n\t/**\n\t * Creates an insert operation.\n\t *\n\t * @param {module:engine/model/position~Position} sourcePosition\n\t * Position before the first {@link module:engine/model/item~Item model item} to move.\n\t * @param {Number} howMany Offset size of moved range. Moved range will start from `sourcePosition` and end at\n\t * `sourcePosition` with offset shifted by `howMany`.\n\t */\n\tconstructor( sourcePosition, howMany ) {\n\t\tsuper( null );\n\n\t\t/**\n\t\t * Position before the first {@link module:engine/model/item~Item model item} to detach.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} #sourcePosition\n\t\t */\n\t\tthis.sourcePosition = Position.createFromPosition( sourcePosition );\n\n\t\t/**\n\t\t * Offset size of moved range.\n\t\t *\n\t\t * @member {Number} #howMany\n\t\t */\n\t\tthis.howMany = howMany;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget type() {\n\t\treturn 'detach';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_validate() {\n\t\tif ( this.sourcePosition.root.document ) {\n\t\t\t/**\n\t\t\t * Cannot detach document node.\n\t\t\t * Use {@link module:engine/model/operation/removeoperation~RemoveOperation remove operation} instead.\n\t\t\t *\n\t\t\t * @error detach-operation-on-document-node\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'detach-operation-on-document-node: Cannot detach document node.' );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\t_execute() {\n\t\t_remove( Range.createFromPositionAndShift( this.sourcePosition, this.howMany ) );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get className() {\n\t\treturn 'engine.model.operation.DetachOperation';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/rootelement\n */\n\nimport Element from './element';\n\n/**\n * Type of {@link module:engine/model/element~Element} that is a root of a model tree.\n * @extends module:engine/model/element~Element\n */\nexport default class RootElement extends Element {\n\t/**\n\t * Creates root element.\n\t *\n\t * @param {module:engine/model/document~Document} doc Document that is an owner of this root.\n\t * @param {String} name Node name.\n\t * @param {String} [rootName='main'] Unique root name used to identify this root\n\t * element by {@link module:engine/model/document~Document}.\n\t */\n\tconstructor( doc, name, rootName = 'main' ) {\n\t\tsuper( name );\n\n\t\t/**\n\t\t * Document that is an owner of this root.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/document~Document}\n\t\t */\n\t\tthis._doc = doc;\n\n\t\t/**\n\t\t * Unique root name used to identify this root element by {@link module:engine/model/document~Document}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.rootName = rootName;\n\t}\n\n\t/**\n\t * {@link module:engine/model/document~Document Document} that owns this root element.\n\t *\n\t * In contrary, to {@link module:engine/model/node~Node node}, root element always have a `document`.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this._doc;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'rootElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'rootElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n\n\t/**\n\t * Converts `RootElement` instance to `String` containing it's name.\n\t *\n\t * @returns {String} `RootElement` instance converted to `String`.\n\t */\n\ttoJSON() {\n\t\treturn this.rootName;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/writer\n */\n\nimport AttributeDelta from './delta/attributedelta';\nimport InsertDelta from './delta/insertdelta';\nimport MarkerDelta from './delta/markerdelta';\nimport MergeDelta from './delta/mergedelta';\nimport MoveDelta from './delta/movedelta';\nimport RemoveDelta from './delta/removedelta';\nimport RenameDelta from './delta/renamedelta';\nimport RootAttributeDelta from './delta/rootattributedelta';\nimport SplitDelta from './delta/splitdelta';\nimport UnwrapDelta from './delta/unwrapdelta';\nimport WeakInsertDelta from './delta/weakinsertdelta';\nimport WrapDelta from './delta/wrapdelta';\n\nimport AttributeOperation from './operation/attributeoperation';\nimport DetachOperation from './operation/detachoperation';\nimport InsertOperation from './operation/insertoperation';\nimport MarkerOperation from './operation/markeroperation';\nimport MoveOperation from './operation/moveoperation';\nimport RemoveOperation from './operation/removeoperation';\nimport RenameOperation from './operation/renameoperation';\nimport RootAttributeOperation from './operation/rootattributeoperation';\n\nimport DocumentFragment from './documentfragment';\nimport Text from './text';\nimport Element from './element';\nimport RootElement from './rootelement';\nimport Position from './position';\nimport Range from './range.js';\nimport DocumentSelection from './documentselection';\n\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * The model can only be modified by using the writer. It should be used whenever you want to create a node, modify\n * child nodes, attributes or text, set the selection's position and its attributes.\n *\n * The instance of the writer is only available in the {@link module:engine/model/model~Model#change `change()`} or\n * {@link module:engine/model/model~Model#enqueueChange `enqueueChange()`}.\n *\n *\t\tmodel.change( writer => {\n *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n *\t\t} );\n *\n * Note that the writer should never be stored and used outside of the `change()` and\n * `enqueueChange()` blocks.\n *\n * @see module:engine/model/model~Model#change\n * @see module:engine/model/model~Model#enqueueChange\n */\nexport default class Writer {\n\t/**\n\t * Creates a writer instance.\n\t *\n\t * **Note:** It is not recommended to use it directly. Use {@link module:engine/model/model~Model#change `Model#change()`} or\n\t * {@link module:engine/model/model~Model#enqueueChange `Model#enqueueChange()`} instead.\n\t *\n\t * @protected\n\t * @param {module:engine/model/model~Model} model\n\t * @param {module:engine/model/batch~Batch} batch\n\t */\n\tconstructor( model, batch ) {\n\t\t/**\n\t\t * Instance of the model on which this writer operates.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The batch to which this writer will add changes.\n\t\t *\n\t\t * @readonly\n\t\t * @type {module:engine/model/batch~Batch}\n\t\t */\n\t\tthis.batch = batch;\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/text~Text text node}.\n\t *\n\t *\t\twriter.createText( 'foo' );\n\t *\t\twriter.createText( 'foo', { bold: true } );\n\t *\n\t * @param {String} data Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @returns {module:engine/model/text~Text} Created text node.\n\t */\n\tcreateText( data, attributes ) {\n\t\treturn new Text( data, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/element~Element element}.\n\t *\n\t *\t\twriter.createElement( 'paragraph' );\n\t *\t\twriter.createElement( 'paragraph', { alignment: 'center' } );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @returns {module:engine/model/element~Element} Created element.\n\t */\n\tcreateElement( name, attributes ) {\n\t\treturn new Element( name, attributes );\n\t}\n\n\t/**\n\t * Creates a new {@link module:engine/model/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @returns {module:engine/model/documentfragment~DocumentFragment} Created document fragment.\n\t */\n\tcreateDocumentFragment() {\n\t\treturn new DocumentFragment();\n\t}\n\n\t/**\n\t * Inserts item on given position.\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.insert( paragraph, position );\n\t *\n\t * Instead of using position you can use parent and offset:\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\twriter.insert( text, paragraph, 5 );\n\t *\n\t * You can also use `end` instead of the offset to insert at the end:\n\t *\n\t *\t\tconst text = writer.createText( 'foo' );\n\t *\t\twriter.insert( text, paragraph, 'end' );\n\t *\n\t * Or insert before or after another element:\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.insert( paragraph, anotherParagraph, 'after' );\n\t *\n\t * These parameters works the same way as {@link module:engine/model/position~Position.createAt `Position.createAt()`}.\n\t *\n\t * Note that if the item already has parent it will be removed from the previous parent.\n\t *\n\t * Note that you cannot re-insert a node from a document to a different document or a document fragment. In this case,\n\t * `model-writer-insert-forbidden-move` is thrown.\n\t *\n\t * If you want to move {@link module:engine/model/range~Range range} instead of an\n\t * {@link module:engine/model/item~Item item} use {@link module:engine/model/writer~Writer#move `Writer#move()`}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/documentfragment~DocumentFragment} item Item or document\n\t * fragment to insert.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * second parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsert( item, itemOrPosition, offset ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst position = Position.createAt( itemOrPosition, offset );\n\n\t\t// For text that has no parent we need to make a WeakInsert.\n\t\tconst delta = item instanceof Text && !item.parent ? new WeakInsertDelta() : new InsertDelta();\n\n\t\t// If item has a parent already.\n\t\tif ( item.parent ) {\n\t\t\t// We need to check if item is going to be inserted within the same document.\n\t\t\tif ( isSameTree( item.root, position.root ) ) {\n\t\t\t\t// If it's we just need to move it.\n\t\t\t\tthis.move( Range.createOn( item ), position );\n\n\t\t\t\treturn;\n\t\t\t}\n\t\t\t// If it isn't the same root.\n\t\t\telse {\n\t\t\t\tif ( item.root.document ) {\n\t\t\t\t\t// It is forbidden to move a node that was already in a document outside of it.\n\t\t\t\t\tthrow new Error( 'model-writer-insert-forbidden-move: Cannot move a node from a document to a different tree.' );\n\t\t\t\t} else {\n\t\t\t\t\t// Move between two different document fragments or from document fragment to a document is possible.\n\t\t\t\t\t// In that case, remove the item from it's original parent.\n\t\t\t\t\tthis.remove( item );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tconst version = position.root.document ? position.root.document.version : null;\n\n\t\tconst insert = new InsertOperation( position, item, version );\n\n\t\tthis.batch.addDelta( delta );\n\t\tdelta.addOperation( insert );\n\t\tthis.model.applyOperation( insert );\n\n\t\t// When element is a DocumentFragment we need to move its markers to Document#markers.\n\t\tif ( item instanceof DocumentFragment ) {\n\t\t\tfor ( const [ markerName, markerRange ] of item.markers ) {\n\t\t\t\t// We need to migrate marker range from DocumentFragment to Document.\n\t\t\t\tconst rangeRootPosition = Position.createAt( markerRange.root );\n\t\t\t\tconst range = new Range(\n\t\t\t\t\tmarkerRange.start._getCombined( rangeRootPosition, position ),\n\t\t\t\t\tmarkerRange.end._getCombined( rangeRootPosition, position )\n\t\t\t\t);\n\n\t\t\t\tthis.addMarker( markerName, { range, usingOperation: true } );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates and inserts text on given position. You can optionally set text attributes:\n\t *\n\t *\t\twriter.insertText( 'foo', position );\n\t *\t\twriter.insertText( 'foo', { bold: true }, position );\n\t *\n\t * Instead of using position you can use parent and offset or define that text should be inserted at the end\n\t * or before or after other node:\n\t *\n\t *\t\t// Inserts 'foo' in paragraph, at offset 5:\n\t *\t\twriter.insertText( 'foo', paragraph, 5 );\n\t *\t\t// Inserts 'foo' at the end of a paragraph:\n\t *\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t// Inserts 'foo' after an image:\n\t *\t\twriter.insertText( 'foo', image, 'after' );\n\t *\n\t * These parameters work in the same way as {@link module:engine/model/position~Position.createAt `Position.createAt()`}.\n\t *\n\t * @param {String} data Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * third parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsertText( text, attributes, itemOrPosition, offset ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element || attributes instanceof Position ) {\n\t\t\tthis.insert( this.createText( text ), attributes, itemOrPosition );\n\t\t} else {\n\t\t\tthis.insert( this.createText( text, attributes ), itemOrPosition, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates and inserts element on given position. You can optionally set attributes:\n\t *\n\t *\t\twriter.insertElement( 'paragraph', position );\n\t *\t\twriter.insertElement( 'paragraph', { alignment: 'center' }, position );\n\t *\n\t * Instead of using position you can use parent and offset or define that text should be inserted at the end\n\t * or before or after other node:\n\t *\n\t *\t\t// Inserts paragraph in the root at offset 5:\n\t *\t\twriter.insertElement( 'paragraph', root, 5 );\n\t *\t\t// Inserts paragraph at the end of a blockquote:\n\t *\t\twriter.insertElement( 'paragraph', blockquote, 'end' );\n\t *\t\t// Inserts after an image:\n\t *\t\twriter.insertElement( 'paragraph', image, 'after' );\n\t *\n\t * These parameters works the same way as {@link module:engine/model/position~Position.createAt `Position.createAt()`}.\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * third parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tinsertElement( name, attributes, itemOrPosition, offset ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element || attributes instanceof Position ) {\n\t\t\tthis.insert( this.createElement( name ), attributes, itemOrPosition );\n\t\t} else {\n\t\t\tthis.insert( this.createElement( name, attributes ), itemOrPosition, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Inserts item at the end of the given parent.\n\t *\n\t *\t\tconst paragraph = writer.createElement( 'paragraph' );\n\t *\t\twriter.append( paragraph, root );\n\t *\n\t * Note that if the item already has parent it will be removed from the previous parent.\n\t *\n\t * If you want to move {@link module:engine/model/range~Range range} instead of an\n\t * {@link module:engine/model/item~Item item} use {@link module:engine/model/writer~Writer#move `Writer#move()`}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/documentfragment~DocumentFragment}\n\t * item Item or document fragment to insert.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappend( item, parent ) {\n\t\tthis.insert( item, parent, 'end' );\n\t}\n\n\t/**\n\t * Creates text node and inserts it at the end of the parent. You can optionally set text attributes:\n\t *\n\t *\t\twriter.appendText( 'foo', paragraph );\n\t *\t\twriter.appendText( 'foo', { bold: true }, paragraph );\n\t *\n\t * @param {String} text Text data.\n\t * @param {Object} [attributes] Text attributes.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappendText( text, attributes, parent ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element ) {\n\t\t\tthis.insert( this.createText( text ), attributes, 'end' );\n\t\t} else {\n\t\t\tthis.insert( this.createText( text, attributes ), parent, 'end' );\n\t\t}\n\t}\n\n\t/**\n\t * Creates element and inserts it at the end of the parent. You can optionally set attributes:\n\t *\n\t *\t\twriter.appendElement( 'paragraph', root );\n\t *\t\twriter.appendElement( 'paragraph', { alignment: 'center' }, root );\n\t *\n\t * @param {String} name Name of the element.\n\t * @param {Object} [attributes] Elements attributes.\n\t * @param {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment} parent\n\t */\n\tappendElement( name, attributes, parent ) {\n\t\tif ( attributes instanceof DocumentFragment || attributes instanceof Element ) {\n\t\t\tthis.insert( this.createElement( name ), attributes, 'end' );\n\t\t} else {\n\t\t\tthis.insert( this.createElement( name, attributes ), parent, 'end' );\n\t\t}\n\t}\n\n\t/**\n\t * Sets value of the attribute with given key on a {@link module:engine/model/item~Item model item}\n\t * or on a {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {*} value Attribute new value.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range on which the attribute will be set.\n\t */\n\tsetAttribute( key, value, itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( itemOrRange instanceof Range ) {\n\t\t\tsetAttributeOnRange( this, key, value, itemOrRange );\n\t\t} else {\n\t\t\tsetAttributeOnItem( this, key, value, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Sets values of attributes on a {@link module:engine/model/item~Item model item}\n\t * or on a {@link module:engine/model/range~Range range}.\n\t *\n\t *\t\twriter.setAttributes( {\n\t *\t\t\tbold: true,\n\t *\t\t\titalic: true\n\t *\t\t}, range );\n\t *\n\t * @param {Object} attributes Attributes keys and values.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range on which the attributes will be set.\n\t */\n\tsetAttributes( attributes, itemOrRange ) {\n\t\tfor ( const [ key, val ] of toMap( attributes ) ) {\n\t\t\tthis.setAttribute( key, val, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Removes an attribute with given key from a {@link module:engine/model/item~Item model item}\n\t * or from a {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {String} key Attribute key.\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range from which the attribute will be removed.\n\t */\n\tremoveAttribute( key, itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( itemOrRange instanceof Range ) {\n\t\t\tsetAttributeOnRange( this, key, null, itemOrRange );\n\t\t} else {\n\t\t\tsetAttributeOnItem( this, key, null, itemOrRange );\n\t\t}\n\t}\n\n\t/**\n\t * Removes all attributes from all elements in the range or from the given item.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange\n\t * Model item or range from which all attributes will be removed.\n\t */\n\tclearAttributes( itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst removeAttributesFromItem = item => {\n\t\t\tfor ( const attribute of item.getAttributeKeys() ) {\n\t\t\t\tthis.removeAttribute( attribute, item );\n\t\t\t}\n\t\t};\n\n\t\tif ( !( itemOrRange instanceof Range ) ) {\n\t\t\tremoveAttributesFromItem( itemOrRange );\n\t\t} else {\n\t\t\tfor ( const item of itemOrRange.getItems() ) {\n\t\t\t\tremoveAttributesFromItem( item );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Moves all items in the source range to the target position.\n\t *\n\t *\t\twriter.move( sourceRange, targetPosition );\n\t *\n\t * Instead of the target position you can use parent and offset or define that range should be moved to the end\n\t * or before or after chosen item:\n\t *\n\t *\t\t// Moves all items in the range to the paragraph at offset 5:\n\t *\t\twriter.move( sourceRange, paragraph, 5 );\n\t *\t\t// Moves all items in the range to the end of a blockquote:\n\t *\t\twriter.move( sourceRange, blockquote, 'end' );\n\t *\t\t// Moves all items in the range to a position after an image:\n\t *\t\twriter.move( sourceRange, image, 'after' );\n\t *\n\t * These parameters works the same way as {@link module:engine/model/position~Position.createAt `Position.createAt()`}.\n\t *\n\t * Note that items can be moved only within the same tree. It means that you can move items within the same root\n\t * (element or document fragment) or between {@link module:engine/model/document~Document#roots documents roots},\n\t * but you can not move items from document fragment to the document or from one detached element to another. Use\n\t * {@link module:engine/model/writer~Writer#insert} in such cases.\n\t *\n\t * @param {module:engine/model/range~Range} range Source range.\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * second parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tmove( range, itemOrPosition, offset ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\t/**\n\t\t\t * Invalid range to move.\n\t\t\t *\n\t\t\t * @error writer-move-invalid-range\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-invalid-range: Invalid range to move.' );\n\t\t}\n\n\t\tif ( !range.isFlat ) {\n\t\t\t/**\n\t\t\t * Range to move is not flat.\n\t\t\t *\n\t\t\t * @error writer-move-range-not-flat\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-range-not-flat: Range to move is not flat.' );\n\t\t}\n\n\t\tconst position = Position.createAt( itemOrPosition, offset );\n\n\t\tif ( !isSameTree( range.root, position.root ) ) {\n\t\t\t/**\n\t\t\t * Range is going to be moved within not the same document. Please use\n\t\t\t * {@link module:engine/model/writer~Writer#insert insert} instead.\n\t\t\t *\n\t\t\t * @error writer-move-different-document\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-move-different-document: Range is going to be moved between different documents.' );\n\t\t}\n\n\t\tconst delta = new MoveDelta();\n\t\tthis.batch.addDelta( delta );\n\n\t\tconst version = range.root.document ? range.root.document.version : null;\n\n\t\tconst operation = new MoveOperation( range.start, range.end.offset - range.start.offset, position, version );\n\t\tdelta.addOperation( operation );\n\t\tthis.model.applyOperation( operation );\n\t}\n\n\t/**\n\t * Removes given model {@link module:engine/model/item~Item item} or {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/range~Range} itemOrRange Model item or range to remove.\n\t */\n\tremove( itemOrRange ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst addRemoveDelta = ( position, howMany ) => {\n\t\t\tconst delta = new RemoveDelta();\n\t\t\tthis.batch.addDelta( delta );\n\n\t\t\tapplyRemoveOperation( position, howMany, delta, this.model );\n\t\t};\n\n\t\tif ( itemOrRange instanceof Range ) {\n\t\t\t// The array is reversed, so the ranges to remove are in correct order and do not have to be updated.\n\t\t\tconst ranges = itemOrRange.getMinimalFlatRanges().reverse();\n\n\t\t\tfor ( const flat of ranges ) {\n\t\t\t\taddRemoveDelta( flat.start, flat.end.offset - flat.start.offset );\n\t\t\t}\n\t\t} else {\n\t\t\tconst howMany = itemOrRange.is( 'text' ) ? itemOrRange.offsetSize : 1;\n\n\t\t\taddRemoveDelta( Position.createBefore( itemOrRange ), howMany );\n\t\t}\n\t}\n\n\t/**\n\t * Merges two siblings at the given position.\n\t *\n\t * Node before and after the position have to be an element. Otherwise `writer-merge-no-element-before` or\n\t * `writer-merge-no-element-after` error will be thrown.\n\t *\n\t * @param {module:engine/model/position~Position} position Position of merge.\n\t */\n\tmerge( position ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst delta = new MergeDelta();\n\t\tthis.batch.addDelta( delta );\n\n\t\tconst nodeBefore = position.nodeBefore;\n\t\tconst nodeAfter = position.nodeAfter;\n\n\t\tif ( !( nodeBefore instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Node before merge position must be an element.\n\t\t\t *\n\t\t\t * @error writer-merge-no-element-before\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-merge-no-element-before: Node before merge position must be an element.' );\n\t\t}\n\n\t\tif ( !( nodeAfter instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Node after merge position must be an element.\n\t\t\t *\n\t\t\t * @error writer-merge-no-element-after\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-merge-no-element-after: Node after merge position must be an element.' );\n\t\t}\n\n\t\tconst positionAfter = Position.createFromParentAndOffset( nodeAfter, 0 );\n\t\tconst positionBefore = Position.createFromParentAndOffset( nodeBefore, nodeBefore.maxOffset );\n\n\t\tconst moveVersion = position.root.document ? position.root.document.version : null;\n\n\t\tconst move = new MoveOperation(\n\t\t\tpositionAfter,\n\t\t\tnodeAfter.maxOffset,\n\t\t\tpositionBefore,\n\t\t\tmoveVersion\n\t\t);\n\n\t\tmove.isSticky = true;\n\t\tdelta.addOperation( move );\n\t\tthis.model.applyOperation( move );\n\n\t\tapplyRemoveOperation( position, 1, delta, this.model );\n\t}\n\n\t/**\n\t * Renames the given element.\n\t *\n\t * @param {module:engine/model/element~Element} element The element to rename.\n\t * @param {String} newName New element name.\n\t */\n\trename( element, newName ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !( element instanceof Element ) ) {\n\t\t\t/**\n\t\t\t * Trying to rename an object which is not an instance of Element.\n\t\t\t *\n\t\t\t * @error writer-rename-not-element-instance\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'writer-rename-not-element-instance: Trying to rename an object which is not an instance of Element.'\n\t\t\t);\n\t\t}\n\n\t\tconst delta = new RenameDelta();\n\t\tthis.batch.addDelta( delta );\n\n\t\tconst version = element.root.document ? element.root.document.version : null;\n\n\t\tconst renameOperation = new RenameOperation( Position.createBefore( element ), element.name, newName, version );\n\t\tdelta.addOperation( renameOperation );\n\t\tthis.model.applyOperation( renameOperation );\n\t}\n\n\t/**\n\t * Splits elements starting from the given position and going to the top of the model tree as long as given\n\t * `limitElement` is reached. When `limitElement` is not defined then only the parent of the given position will be split.\n\t *\n\t * The element needs to have a parent. It cannot be a root element nor a document fragment.\n\t * The `writer-split-element-no-parent` error will be thrown if you try to split an element with no parent.\n\t *\n\t * @param {module:engine/model/position~Position} position Position of split.\n\t * @param {module:engine/model/node~Node} [limitElement] Stop splitting when this element will be reached.\n\t * @returns {Object} result Split result.\n\t * @returns {module:engine/model/position~Position} result.position between split elements.\n\t * @returns {module:engine/model/range~Range} result.range Range that stars from the end of the first split element and ands\n\t * at the beginning of the first copy element.\n\t */\n\tsplit( position, limitElement ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tlet splitElement = position.parent;\n\n\t\tif ( !splitElement.parent ) {\n\t\t\t/**\n\t\t\t * Element with no parent can not be split.\n\t\t\t *\n\t\t\t * @error writer-split-element-no-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-split-element-no-parent: Element with no parent can not be split.' );\n\t\t}\n\n\t\t// When limit element is not defined lets set splitElement parent as limit.\n\t\tif ( !limitElement ) {\n\t\t\tlimitElement = splitElement.parent;\n\t\t}\n\n\t\tif ( !position.parent.getAncestors( { includeSelf: true } ).includes( limitElement ) ) {\n\t\t\tthrow new CKEditorError( 'writer-split-invalid-limit-element: Limit element is not a position ancestor.' );\n\t\t}\n\n\t\t// We need to cache elements that will be created as a result of the first split because\n\t\t// we need to create a range from the end of the first split element to the beginning of the\n\t\t// first copy element. This should be handled by LiveRange but it doesn't work on detached nodes.\n\t\tlet firstSplitElement, firstCopyElement;\n\n\t\tdo {\n\t\t\tconst delta = new SplitDelta();\n\t\t\tthis.batch.addDelta( delta );\n\n\t\t\tconst copy = new Element( splitElement.name, splitElement.getAttributes() );\n\t\t\tconst insertVersion = splitElement.root.document ? splitElement.root.document.version : null;\n\n\t\t\tconst insert = new InsertOperation(\n\t\t\t\tPosition.createAfter( splitElement ),\n\t\t\t\tcopy,\n\t\t\t\tinsertVersion\n\t\t\t);\n\n\t\t\tdelta.addOperation( insert );\n\t\t\tthis.model.applyOperation( insert );\n\n\t\t\tconst moveVersion = insertVersion !== null ? insertVersion + 1 : null;\n\n\t\t\tconst move = new MoveOperation(\n\t\t\t\tposition,\n\t\t\t\tsplitElement.maxOffset - position.offset,\n\t\t\t\tPosition.createFromParentAndOffset( copy, 0 ),\n\t\t\t\tmoveVersion\n\t\t\t);\n\t\t\tmove.isSticky = true;\n\n\t\t\tdelta.addOperation( move );\n\t\t\tthis.model.applyOperation( move );\n\n\t\t\t// Cache result of the first split.\n\t\t\tif ( !firstSplitElement && !firstCopyElement ) {\n\t\t\t\tfirstSplitElement = splitElement;\n\t\t\t\tfirstCopyElement = copy;\n\t\t\t}\n\n\t\t\tposition = Position.createBefore( copy );\n\t\t\tsplitElement = position.parent;\n\t\t} while ( splitElement !== limitElement );\n\n\t\treturn {\n\t\t\tposition,\n\t\t\trange: new Range( Position.createAt( firstSplitElement, 'end' ), Position.createAt( firstCopyElement ) )\n\t\t};\n\t}\n\n\t/**\n\t * Wraps the given range with the given element or with a new element (if a string was passed).\n\t *\n\t * **Note:** range to wrap should be a \"flat range\" (see {@link module:engine/model/range~Range#isFlat `Range#isFlat`}).\n\t * If not, an error will be thrown.\n\t *\n\t * @param {module:engine/model/range~Range} range Range to wrap.\n\t * @param {module:engine/model/element~Element|String} elementOrString Element or name of element to wrap the range with.\n\t */\n\twrap( range, elementOrString ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !range.isFlat ) {\n\t\t\t/**\n\t\t\t * Range to wrap is not flat.\n\t\t\t *\n\t\t\t * @error writer-wrap-range-not-flat\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-range-not-flat: Range to wrap is not flat.' );\n\t\t}\n\n\t\tconst element = elementOrString instanceof Element ? elementOrString : new Element( elementOrString );\n\n\t\tif ( element.childCount > 0 ) {\n\t\t\t/**\n\t\t\t * Element to wrap with is not empty.\n\t\t\t *\n\t\t\t * @error writer-wrap-element-not-empty\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-element-not-empty: Element to wrap with is not empty.' );\n\t\t}\n\n\t\tif ( element.parent !== null ) {\n\t\t\t/**\n\t\t\t * Element to wrap with is already attached to a tree model.\n\t\t\t *\n\t\t\t * @error writer-wrap-element-attached\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-wrap-element-attached: Element to wrap with is already attached to tree model.' );\n\t\t}\n\n\t\tconst delta = new WrapDelta();\n\t\tthis.batch.addDelta( delta );\n\n\t\tconst insertVersion = range.root.document ? range.root.document.version : null;\n\n\t\tconst insert = new InsertOperation( range.end, element, insertVersion );\n\t\tdelta.addOperation( insert );\n\t\tthis.model.applyOperation( insert );\n\n\t\tconst moveVersion = insertVersion !== null ? insertVersion + 1 : null;\n\n\t\tconst targetPosition = Position.createFromParentAndOffset( element, 0 );\n\t\tconst move = new MoveOperation(\n\t\t\trange.start,\n\t\t\trange.end.offset - range.start.offset,\n\t\t\ttargetPosition,\n\t\t\tmoveVersion\n\t\t);\n\t\tdelta.addOperation( move );\n\t\tthis.model.applyOperation( move );\n\t}\n\n\t/**\n\t * Unwraps children of the given element – all its children are moved before it and then the element is removed.\n\t * Throws error if you try to unwrap an element which does not have a parent.\n\t *\n\t * @param {module:engine/model/element~Element} element Element to unwrap.\n\t */\n\tunwrap( element ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( element.parent === null ) {\n\t\t\t/**\n\t\t\t * Trying to unwrap an element which has no parent.\n\t\t\t *\n\t\t\t * @error writer-unwrap-element-no-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-unwrap-element-no-parent: Trying to unwrap an element which has no parent.' );\n\t\t}\n\n\t\tconst delta = new UnwrapDelta();\n\t\tthis.batch.addDelta( delta );\n\n\t\tconst sourcePosition = Position.createFromParentAndOffset( element, 0 );\n\t\tconst moveVersion = sourcePosition.root.document ? sourcePosition.root.document.version : null;\n\n\t\tconst move = new MoveOperation(\n\t\t\tsourcePosition,\n\t\t\telement.maxOffset,\n\t\t\tPosition.createBefore( element ),\n\t\t\tmoveVersion\n\t\t);\n\n\t\tmove.isSticky = true;\n\t\tdelta.addOperation( move );\n\t\tthis.model.applyOperation( move );\n\n\t\tapplyRemoveOperation( Position.createBefore( element ), 1, delta, this.model );\n\t}\n\n\t/**\n\t * Adds a {@link module:engine/model/markercollection~Marker marker}. Marker is a named range, which tracks\n\t * changes in the document and updates its range automatically, when model tree changes.\n\t *\n\t * As the first parameter you can set marker name.\n\t *\n\t * The required `options.usingOperation` parameter lets you decide if the marker should be managed by operations or not. See\n\t * {@link module:engine/model/markercollection~Marker marker class description} to learn about the difference between\n\t * markers managed by operations and not-managed by operations.\n\t *\n\t * The `options.affectsData` parameter, which defaults to `false`, allows you to define if a marker affects the data. It should be\n\t * `true` when the marker change changes the data returned by the\n\t * {@link module:core/editor/utils/dataapimixin~DataApi#getData `editor.getData()`} method.\n\t * When set to `true` it fires the {@link module:engine/model/document~Document#event:change:data `change:data`} event.\n\t * When set to `false` it fires the {@link module:engine/model/document~Document#event:change `change`} event.\n\t *\n\t * Create marker directly base on marker's name:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: false } );\n\t *\n\t * Create marker using operation:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: true } );\n\t *\n\t * Create marker that affects the editor data:\n\t *\n\t *\t\taddMarker( markerName, { range, usingOperation: false, affectsData: true } );\n\t *\n\t * Note: For efficiency reasons, it's best to create and keep as little markers as possible.\n\t *\n\t * @see module:engine/model/markercollection~Marker\n\t * @param {String} name Name of a marker to create - must be unique.\n\t * @param {Object} options\n\t * @param {Boolean} options.usingOperation Flag indicating that the marker should be added by MarkerOperation.\n\t * See {@link module:engine/model/markercollection~Marker#managedUsingOperations}.\n\t * @param {module:engine/model/range~Range} options.range Marker range.\n\t * @param {Boolean} [options.affectsData=false] Flag indicating that the marker changes the editor data.\n\t * @returns {module:engine/model/markercollection~Marker} Marker that was set.\n\t */\n\taddMarker( name, options ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( !options || typeof options.usingOperation != 'boolean' ) {\n\t\t\t/**\n\t\t\t * The `options.usingOperations` parameter is required when adding a new marker.\n\t\t\t *\n\t\t\t * @error writer-addMarker-no-usingOperations\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'writer-addMarker-no-usingOperations: The options.usingOperations parameter is required when adding a new marker.'\n\t\t\t);\n\t\t}\n\n\t\tconst usingOperation = options.usingOperation;\n\t\tconst range = options.range;\n\t\tconst affectsData = options.affectsData === undefined ? false : options.affectsData;\n\n\t\tif ( this.model.markers.has( name ) ) {\n\t\t\t/**\n\t\t\t * Marker with provided name already exists.\n\t\t\t *\n\t\t\t * @error writer-addMarker-marker-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-addMarker-marker-exists: Marker with provided name already exists.' );\n\t\t}\n\n\t\tif ( !range ) {\n\t\t\t/**\n\t\t\t * Range parameter is required when adding a new marker.\n\t\t\t *\n\t\t\t * @error writer-addMarker-no-range\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-addMarker-no-range: Range parameter is required when adding a new marker.' );\n\t\t}\n\n\t\tif ( !usingOperation ) {\n\t\t\treturn this.model.markers._set( name, range, usingOperation, affectsData );\n\t\t}\n\n\t\tapplyMarkerOperation( this, name, null, range, affectsData );\n\n\t\treturn this.model.markers.get( name );\n\t}\n\n\t/**\n\t * Adds or updates a {@link module:engine/model/markercollection~Marker marker}. Marker is a named range, which tracks\n\t * changes in the document and updates its range automatically, when model tree changes. Still, it is possible to change the\n\t * marker's range directly using this method.\n\t *\n\t * As the first parameter you can set marker name or instance. If none of them is provided, new marker, with a unique\n\t * name is created and returned.\n\t *\n\t * The `options.usingOperation` parameter lets you change if the marker should be managed by operations or not. See\n\t * {@link module:engine/model/markercollection~Marker marker class description} to learn about the difference between\n\t * markers managed by operations and not-managed by operations. It is possible to change this option for an existing marker.\n\t *\n\t * The `options.affectsData` parameter, which defaults to `false`, allows you to define if a marker affects the data. It should be\n\t * `true` when the marker change changes the data returned by\n\t * the {@link module:core/editor/utils/dataapimixin~DataApi#getData `editor.getData()`} method.\n\t * When set to `true` it fires the {@link module:engine/model/document~Document#event:change:data `change:data`} event.\n\t * When set to `false` it fires the {@link module:engine/model/document~Document#event:change `change`} event.\n\t *\n\t * Update marker directly base on marker's name:\n\t *\n\t *\t\tupdateMarker( markerName, { range } );\n\t *\n\t * Update marker using operation:\n\t *\n\t *\t\tupdateMarker( marker, { range, usingOperation: true } );\n\t *\t\tupdateMarker( markerName, { range, usingOperation: true } );\n\t *\n\t * Change marker's option (start using operations to manage it):\n\t *\n\t *\t\tupdateMarker( marker, { usingOperation: true } );\n\t *\n\t * Change marker's option (inform the engine, that the marker does not affect the data anymore):\n\t *\n\t *\t\tupdateMarker( markerName, { affectsData: false } );\n\t *\n\t * @see module:engine/model/markercollection~Marker\n\t * @param {String} markerOrName Name of a marker to update, or a marker instance.\n\t * @param {Object} options\n\t * @param {module:engine/model/range~Range} [options.range] Marker range to update.\n\t * @param {Boolean} [options.usingOperation] Flag indicated whether the marker should be added by MarkerOperation.\n\t * See {@link module:engine/model/markercollection~Marker#managedUsingOperations}.\n\t * @param {Boolean} [options.affectsData] Flag indicating that the marker changes the editor data.\n\t */\n\tupdateMarker( markerOrName, options = {} ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst markerName = typeof markerOrName == 'string' ? markerOrName : markerOrName.name;\n\t\tconst currentMarker = this.model.markers.get( markerName );\n\n\t\tif ( !currentMarker ) {\n\t\t\t/**\n\t\t\t * Marker with provided name does not exists.\n\t\t\t *\n\t\t\t * @error writer-updateMarker-marker-not-exists\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-updateMarker-marker-not-exists: Marker with provided name does not exists.' );\n\t\t}\n\n\t\tconst hasUsingOperationDefined = typeof options.usingOperation == 'boolean';\n\t\tconst affectsDataDefined = typeof options.affectsData == 'boolean';\n\n\t\t// Use previously defined marker's affectsData if the property is not provided.\n\t\tconst affectsData = affectsDataDefined ? options.affectsData : currentMarker.affectsData;\n\n\t\tif ( !hasUsingOperationDefined && !options.range && !affectsDataDefined ) {\n\t\t\t/**\n\t\t\t * One of the options is required - provide range, usingOperations or affectsData.\n\t\t\t *\n\t\t\t * @error writer-updateMarker-wrong-options\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'writer-updateMarker-wrong-options: One of the options is required - provide range, usingOperations or affectsData.'\n\t\t\t);\n\t\t}\n\n\t\tconst currentRange = currentMarker.getRange();\n\t\tconst updatedRange = options.range ? options.range : currentRange;\n\n\t\tif ( hasUsingOperationDefined && options.usingOperation !== currentMarker.managedUsingOperations ) {\n\t\t\t// The marker type is changed so it's necessary to create proper operations.\n\t\t\tif ( options.usingOperation ) {\n\t\t\t\t// If marker changes to a managed one treat this as synchronizing existing marker.\n\t\t\t\t// Create `MarkerOperation` with `oldRange` set to `null`, so reverse operation will remove the marker.\n\t\t\t\tapplyMarkerOperation( this, markerName, null, updatedRange, affectsData );\n\t\t\t} else {\n\t\t\t\t// If marker changes to a marker that do not use operations then we need to create additional operation\n\t\t\t\t// that removes that marker first.\n\t\t\t\tapplyMarkerOperation( this, markerName, currentRange, null, affectsData );\n\n\t\t\t\t// Although not managed the marker itself should stay in model and its range should be preserver or changed to passed range.\n\t\t\t\tthis.model.markers._set( markerName, updatedRange, undefined, affectsData );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Marker's type doesn't change so update it accordingly.\n\t\tif ( currentMarker.managedUsingOperations ) {\n\t\t\tapplyMarkerOperation( this, markerName, currentRange, updatedRange, affectsData );\n\t\t} else {\n\t\t\tthis.model.markers._set( markerName, updatedRange, undefined, affectsData );\n\t\t}\n\t}\n\n\t/**\n\t * Removes given {@link module:engine/model/markercollection~Marker marker} or marker with given name.\n\t * The marker is removed accordingly to how it has been created, so if the marker was created using operation,\n\t * it will be destroyed using operation.\n\t *\n\t * @param {module:engine/model/markercollection~Marker|String} markerOrName Marker or marker name to remove.\n\t */\n\tremoveMarker( markerOrName ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tconst name = typeof markerOrName == 'string' ? markerOrName : markerOrName.name;\n\n\t\tif ( !this.model.markers.has( name ) ) {\n\t\t\t/**\n\t\t\t * Trying to remove marker which does not exist.\n\t\t\t *\n\t\t\t * @error writer-removeMarker-no-marker\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'writer-removeMarker-no-marker: Trying to remove marker which does not exist.' );\n\t\t}\n\n\t\tconst marker = this.model.markers.get( name );\n\n\t\tif ( !marker.managedUsingOperations ) {\n\t\t\tthis.model.markers._remove( name );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst oldRange = marker.getRange();\n\n\t\tapplyMarkerOperation( this, name, oldRange, null, marker.affectsData );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/model/selection~Selection selection}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/node~Node node}, {@link module:engine/model/position~Position position},\n\t * {@link module:engine/model/range~Range range}, an iterable of {@link module:engine/model/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t *\t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\twriter.setSelection( range );\n\t *\n\t *\t\t// Sets selection to other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\twriter.setSelection( otherSelection );\n\t *\n\t *\t\t// Sets selection to the given document selection.\n\t *\t\tconst documentSelection = new DocumentSelection( doc );\n\t *\t\twriter.setSelection( documentSelection );\n\t *\n\t *\t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\twriter.setSelection( position );\n\t *\n\t *\t\t// Sets collapsed selection at the position of the given node and an offset.\n\t *\t\twriter.setSelection( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/model/element~Element element} which starts before the first child of\n \t * that element and ends after the last child of that element.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/model/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\twriter.setSelection( paragraph, 'on' );\n\t *\n\t *\t\t// Removes all selection's ranges.\n\t *\t\twriter.setSelection( null );\n\t *\n\t * `Writer#setSelection()` allow passing additional options (`backward`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\twriter.setSelection( range, { backward: true } );\n\t *\n\t * Throws `writer-incorrect-use` error when the writer is used outside the `change()` block.\n\t *\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection|\n\t * module:engine/model/position~Position|module:engine/model/node~Node|\n\t * Iterable.<module:engine/model/range~Range>|module:engine/model/range~Range|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t */\n\tsetSelection( selectable, placeOrOffset, options ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tthis.model.document.selection._setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link module:engine/model/documentselection~DocumentSelection#focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as\n\t * {@link module:engine/model/position~Position.createAt `Position.createAt()`} parameters.\n\t *\n\t * @param {module:engine/model/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/model/item~Item model item}.\n\t */\n\tsetSelectionFocus( itemOrPosition, offset ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tthis.model.document.selection._setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Sets attribute(s) on the selection. If attribute with the same key already is set, it's value is overwritten.\n\t *\n\t * Using key and value pair:\n\t *\n\t * \twriter.setSelectionAttribute( 'italic', true );\n\t *\n\t * Using key-value object:\n\t *\n\t * \twriter.setSelectionAttribute( { italic: true, bold: false } );\n\t *\n\t * Using iterable object:\n\t *\n\t * \twriter.setSelectionAttribute( new Map( [ [ 'italic', true ] ] ) );\n\t *\n\t * @param {String|Object|Iterable.<*>} keyOrObjectOrIterable Key of the attribute to set\n\t * or object / iterable of key => value attribute pairs.\n\t * @param {*} [value] Attribute value.\n\t */\n\tsetSelectionAttribute( keyOrObjectOrIterable, value ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( typeof keyOrObjectOrIterable === 'string' ) {\n\t\t\tthis._setSelectionAttribute( keyOrObjectOrIterable, value );\n\t\t} else {\n\t\t\tfor ( const [ key, value ] of toMap( keyOrObjectOrIterable ) ) {\n\t\t\t\tthis._setSelectionAttribute( key, value );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute(s) with given key(s) from the selection.\n\t *\n\t * Remove one attribute:\n\t *\n\t *\t\twriter.removeSelectionAttribute( 'italic' );\n\t *\n\t * Remove multiple attributes:\n\t *\n\t *\t\twriter.removeSelectionAttribute( [ 'italic', 'bold' ] );\n\t *\n\t * @param {String|Iterable.<String>} keyOrIterableOfKeys Key of the attribute to remove or an iterable of attribute keys to remove.\n\t */\n\tremoveSelectionAttribute( keyOrIterableOfKeys ) {\n\t\tthis._assertWriterUsedCorrectly();\n\n\t\tif ( typeof keyOrIterableOfKeys === 'string' ) {\n\t\t\tthis._removeSelectionAttribute( keyOrIterableOfKeys );\n\t\t} else {\n\t\t\tfor ( const key of keyOrIterableOfKeys ) {\n\t\t\t\tthis._removeSelectionAttribute( key );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Temporarily changes the {@link module:engine/model/documentselection~DocumentSelection#isGravityOverridden gravity}\n\t * of the selection from left to right.\n\t *\n\t * The gravity defines from which direction the selection inherits its attributes. If it's the default left gravity,\n\t * then the selection (after being moved by the user) inherits attributes from its left-hand side.\n\t * This method allows to temporarily override this behavior by forcing the gravity to the right.\n\t *\n\t * For the following model fragment:\n\t *\n\t *\t\t<$text bold=\"true\" linkHref=\"url\">bar[]</$text><$text bold=\"true\">biz</$text>\n\t *\n\t * * Default gravity: selection will have the `bold` and `linkHref` attributes.\n\t * * Overridden gravity: selection will have `bold` attribute.\n\t *\n\t * **Note**: It returns an unique identifier which is required to restore the gravity. It guarantees the symmetry\n\t * of the process.\n\t *\n\t * @returns {String} The unique id which allows restoring the gravity.\n\t */\n\toverrideSelectionGravity() {\n\t\treturn this.model.document.selection._overrideGravity();\n\t}\n\n\t/**\n\t * Restores {@link ~Writer#overrideSelectionGravity} gravity to default.\n\t *\n\t * Restoring the gravity is only possible using the unique identifier returned by\n\t * {@link ~Writer#overrideSelectionGravity}. Note that the gravity remains overridden as long as won't be restored\n\t * the same number of times it was overridden.\n\t *\n\t * @param {String} uid The unique id returned by {@link ~Writer#overrideSelectionGravity}.\n\t */\n\trestoreSelectionGravity( uid ) {\n\t\tthis.model.document.selection._restoreGravity( uid );\n\t}\n\n\t/**\n\t * @private\n\t * @param {String} key Key of the attribute to remove.\n\t * @param {*} value Attribute value.\n\t */\n\t_setSelectionAttribute( key, value ) {\n\t\tconst selection = this.model.document.selection;\n\n\t\t// Store attribute in parent element if the selection is collapsed in an empty node.\n\t\tif ( selection.isCollapsed && selection.anchor.parent.isEmpty ) {\n\t\t\tconst storeKey = DocumentSelection._getStoreAttributeKey( key );\n\n\t\t\tthis.setAttribute( storeKey, value, selection.anchor.parent );\n\t\t}\n\n\t\tselection._setAttribute( key, value );\n\t}\n\n\t/**\n\t * @private\n\t * @param {String} key Key of the attribute to remove.\n\t */\n\t_removeSelectionAttribute( key ) {\n\t\tconst selection = this.model.document.selection;\n\n\t\t// Remove stored attribute from parent element if the selection is collapsed in an empty node.\n\t\tif ( selection.isCollapsed && selection.anchor.parent.isEmpty ) {\n\t\t\tconst storeKey = DocumentSelection._getStoreAttributeKey( key );\n\n\t\t\tthis.removeAttribute( storeKey, selection.anchor.parent );\n\t\t}\n\n\t\tselection._removeAttribute( key );\n\t}\n\n\t/**\n\t * Throws `writer-detached-writer-tries-to-modify-model` error when the writer is used outside of the `change()` block.\n\t *\n\t * @private\n\t */\n\t_assertWriterUsedCorrectly() {\n\t\t/**\n\t\t * Trying to use a writer outside a {@link module:engine/model/model~Model#change `change()` or\n\t\t * {@link module:engine/model/model~Model#enqueueChange `enqueueChange()`} blocks.\n\t\t *\n\t\t * The writer can only be used inside these blocks which ensures that the model\n\t\t * can only be changed during such \"sessions\".\n\t\t *\n\t\t * @error writer-incorrect-use\n\t\t */\n\t\tif ( this.model._currentWriter !== this ) {\n\t\t\tthrow new CKEditorError( 'writer-incorrect-use: Trying to use a writer outside the change() block.' );\n\t\t}\n\t}\n}\n\n// Sets given attribute to each node in given range. When attribute value is null then attribute will be removed.\n//\n// Because attribute operation needs to have the same attribute value on the whole range, this function splits\n// the range into smaller parts.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} key Attribute key.\n// @param {*} value Attribute new value.\n// @param {module:engine/model/range~Range} range Model range on which the attribute will be set.\nfunction setAttributeOnRange( writer, key, value, range ) {\n\tconst delta = new AttributeDelta();\n\tconst model = writer.model;\n\tconst doc = model.document;\n\n\t// Position of the last split, the beginning of the new range.\n\tlet lastSplitPosition = range.start;\n\n\t// Currently position in the scanning range. Because we need value after the position, it is not a current\n\t// position of the iterator but the previous one (we need to iterate one more time to get the value after).\n\tlet position;\n\n\t// Value before the currently position.\n\tlet valueBefore;\n\n\t// Value after the currently position.\n\tlet valueAfter;\n\n\tfor ( const val of range ) {\n\t\tvalueAfter = val.item.getAttribute( key );\n\n\t\t// At the first run of the iterator the position in undefined. We also do not have a valueBefore, but\n\t\t// because valueAfter may be null, valueBefore may be equal valueAfter ( undefined == null ).\n\t\tif ( position && valueBefore != valueAfter ) {\n\t\t\t// if valueBefore == value there is nothing to change, so we add operation only if these values are different.\n\t\t\tif ( valueBefore != value ) {\n\t\t\t\taddOperation();\n\t\t\t}\n\n\t\t\tlastSplitPosition = position;\n\t\t}\n\n\t\tposition = val.nextPosition;\n\t\tvalueBefore = valueAfter;\n\t}\n\n\t// Because position in the loop is not the iterator position (see let position comment), the last position in\n\t// the while loop will be last but one position in the range. We need to check the last position manually.\n\tif ( position instanceof Position && position != lastSplitPosition && valueBefore != value ) {\n\t\taddOperation();\n\t}\n\n\tfunction addOperation() {\n\t\t// Add delta to the batch only if there is at least operation in the delta. Add delta only once.\n\t\tif ( delta.operations.length === 0 ) {\n\t\t\twriter.batch.addDelta( delta );\n\t\t}\n\n\t\tconst range = new Range( lastSplitPosition, position );\n\t\tconst version = range.root.document ? doc.version : null;\n\t\tconst operation = new AttributeOperation( range, key, valueBefore, value, version );\n\n\t\tdelta.addOperation( operation );\n\t\tmodel.applyOperation( operation );\n\t}\n}\n\n// Sets given attribute to the given node. When attribute value is null then attribute will be removed.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} key Attribute key.\n// @param {*} value Attribute new value.\n// @param {module:engine/model/item~Item} item Model item on which the attribute will be set.\nfunction setAttributeOnItem( writer, key, value, item ) {\n\tconst model = writer.model;\n\tconst doc = model.document;\n\tconst previousValue = item.getAttribute( key );\n\tlet range, operation;\n\n\tif ( previousValue != value ) {\n\t\tconst isRootChanged = item.root === item;\n\n\t\tconst delta = isRootChanged ? new RootAttributeDelta() : new AttributeDelta();\n\t\twriter.batch.addDelta( delta );\n\n\t\tif ( isRootChanged ) {\n\t\t\t// If we change attributes of root element, we have to use `RootAttributeOperation`.\n\t\t\tconst version = item.document ? doc.version : null;\n\n\t\t\toperation = new RootAttributeOperation( item, key, previousValue, value, version );\n\t\t} else {\n\t\t\tif ( item.is( 'element' ) ) {\n\t\t\t\t// If we change the attribute of the element, we do not want to change attributes of its children, so\n\t\t\t\t// the end of the range cannot be after the closing tag, it should be inside that element, before any of\n\t\t\t\t// it's children, so the range will contain only the opening tag.\n\t\t\t\trange = new Range( Position.createBefore( item ), Position.createFromParentAndOffset( item, 0 ) );\n\t\t\t} else {\n\t\t\t\t// If `item` is text proxy, we create a range from the beginning to the end of that text proxy, to change\n\t\t\t\t// all characters represented by it.\n\t\t\t\trange = new Range( Position.createBefore( item ), Position.createAfter( item ) );\n\t\t\t}\n\n\t\t\tconst version = range.root.document ? doc.version : null;\n\n\t\t\toperation = new AttributeOperation( range, key, previousValue, value, version );\n\t\t}\n\n\t\tdelta.addOperation( operation );\n\t\tmodel.applyOperation( operation );\n\t}\n}\n\n// Creates and applies marker operation to {@link module:engine/model/delta/delta~Delta delta}.\n//\n// @private\n// @param {module:engine/model/writer~Writer} writer\n// @param {String} name Marker name.\n// @param {module:engine/model/range~Range} oldRange Marker range before the change.\n// @param {module:engine/model/range~Range} newRange Marker range after the change.\n// @param {Boolean} affectsData\nfunction applyMarkerOperation( writer, name, oldRange, newRange, affectsData ) {\n\tconst model = writer.model;\n\tconst doc = model.document;\n\tconst delta = new MarkerDelta();\n\n\tconst operation = new MarkerOperation( name, oldRange, newRange, model.markers, doc.version, affectsData );\n\n\twriter.batch.addDelta( delta );\n\tdelta.addOperation( operation );\n\tmodel.applyOperation( operation );\n}\n\n// Creates `RemoveOperation` or `DetachOperation` that removes `howMany` nodes starting from `position`.\n// The operation will be applied on given model instance and added to given delta instance.\n//\n// @private\n// @param {module:engine/model/position~Position} position Position from which nodes are removed.\n// @param {Number} howMany Number of nodes to remove.\n// @param {module:engine/model/delta~Delta} delta Delta to add new operation to.\n// @param {module:engine/model/model~Model} model Model instance on which operation will be applied.\nfunction applyRemoveOperation( position, howMany, delta, model ) {\n\tlet operation;\n\n\tif ( position.root.document ) {\n\t\tconst doc = model.document;\n\t\tconst graveyardPosition = new Position( doc.graveyard, [ 0 ] );\n\n\t\toperation = new RemoveOperation( position, howMany, graveyardPosition, doc.version );\n\t} else {\n\t\toperation = new DetachOperation( position, howMany );\n\t}\n\n\tdelta.addOperation( operation );\n\tmodel.applyOperation( operation );\n}\n\n// Returns `true` if both root elements are the same element or both are documents root elements.\n//\n// Elements in the same tree can be moved (for instance you can move element form one documents root to another, or\n// within the same document fragment), but when element supposed to be moved from document fragment to the document, or\n// to another document it should be removed and inserted to avoid problems with OT. This is because features like undo or\n// collaboration may track changes on the document but ignore changes on detached fragments and should not get\n// unexpected `move` operation.\nfunction isSameTree( rootA, rootB ) {\n\t// If it is the same root this is the same tree.\n\tif ( rootA === rootB ) {\n\t\treturn true;\n\t}\n\n\t// If both roots are documents root it is operation within the document what we still treat as the same tree.\n\tif ( rootA instanceof RootElement && rootB instanceof RootElement ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/differ\n */\n\nimport Position from './position';\nimport Range from './range';\n\n/**\n * Calculates the difference between two model states.\n *\n * Receives operations that are to be applied on the model document. Marks parts of the model document tree which\n * are changed and saves the state of these elements before the change. Then, it compares saved elements with the\n * changed elements, after all changes are applied on the model document. Calculates the diff between saved\n * elements and new ones and returns a change set.\n */\nexport default class Differ {\n\t/**\n\t * Creates a `Differ` instance.\n\t *\n\t * @param {module:engine/model/markercollection~MarkerCollection} markerCollection Model's marker collection.\n\t */\n\tconstructor( markerCollection ) {\n\t\t/**\n\t\t * Reference to the model's marker collection.\n\t\t *\n\t\t * @private\n\t\t * @type {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis._markerCollection = markerCollection;\n\n\t\t/**\n\t\t * A map that stores changes that happened in a given element.\n\t\t *\n\t\t * The keys of the map are references to the model elements.\n\t\t * The values of the map are arrays with changes that were done on this element.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._changesInElement = new Map();\n\n\t\t/**\n\t\t * A map that stores \"element's children snapshots\". A snapshot is representing children of a given element before\n\t\t * the first change was applied on that element. Snapshot items are objects with two properties: `name`,\n\t\t * containing the element name (or `'$text'` for a text node) and `attributes` which is a map of the node's attributes.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._elementSnapshots = new Map();\n\n\t\t/**\n\t\t * A map that stores all changed markers.\n\t\t *\n\t\t * The keys of the map are marker names.\n\t\t * The values of the map are objects with the `oldRange` and `newRange` properties. They store the marker range\n\t\t * state before and after the change.\n\t\t *\n\t\t * @private\n\t\t * @type {Map}\n\t\t */\n\t\tthis._changedMarkers = new Map();\n\n\t\t/**\n\t\t * Stores the number of changes that were processed. Used to order the changes chronologically. It is important\n\t\t * when changes are sorted.\n\t\t *\n\t\t * @private\n\t\t * @type {Number}\n\t\t */\n\t\tthis._changeCount = 0;\n\n\t\t/**\n\t\t * For efficiency purposes, `Differ` stores the change set returned by the differ after {@link #getChanges} call.\n\t\t * Cache is reset each time a new operation is buffered. If the cache has not been reset, {@link #getChanges} will\n\t\t * return the cached value instead of calculating it again.\n\t\t *\n\t\t * This property stores those changes that did not take place in graveyard root.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Object>|null}\n\t\t */\n\t\tthis._cachedChanges = null;\n\n\t\t/**\n\t\t * For efficiency purposes, `Differ` stores the change set returned by the differ after the {@link #getChanges} call.\n\t\t * The cache is reset each time a new operation is buffered. If the cache has not been reset, {@link #getChanges} will\n\t\t * return the cached value instead of calculating it again.\n\t\t *\n\t\t * This property stores all changes evaluated by `Differ`, including those that took place in the graveyard.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Object>|null}\n\t\t */\n\t\tthis._cachedChangesWithGraveyard = null;\n\t}\n\n\t/**\n\t * Informs whether there are any changes buffered in `Differ`.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._changesInElement.size == 0 && this._changedMarkers.size == 0;\n\t}\n\n\t/**\n\t * Buffers the given operation. An operation has to be buffered before it is executed.\n\t *\n\t * Operation type is checked and it is checked which nodes it will affect. These nodes are then stored in `Differ`\n\t * in the state before the operation is executed.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation An operation to buffer.\n\t */\n\tbufferOperation( operation ) {\n\t\tswitch ( operation.type ) {\n\t\t\tcase 'insert': {\n\t\t\t\tif ( this._isInInsertedElement( operation.position.parent ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis._markInsert( operation.position.parent, operation.position.offset, operation.nodes.maxOffset );\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'addAttribute':\n\t\t\tcase 'removeAttribute':\n\t\t\tcase 'changeAttribute': {\n\t\t\t\tfor ( const item of operation.range.getItems() ) {\n\t\t\t\t\tif ( this._isInInsertedElement( item.parent ) ) {\n\t\t\t\t\t\tcontinue;\n\t\t\t\t\t}\n\n\t\t\t\t\tthis._markAttribute( item );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'remove':\n\t\t\tcase 'move':\n\t\t\tcase 'reinsert': {\n\t\t\t\tconst sourceParentInserted = this._isInInsertedElement( operation.sourcePosition.parent );\n\t\t\t\tconst targetParentInserted = this._isInInsertedElement( operation.targetPosition.parent );\n\n\t\t\t\tif ( !sourceParentInserted ) {\n\t\t\t\t\tthis._markRemove( operation.sourcePosition.parent, operation.sourcePosition.offset, operation.howMany );\n\t\t\t\t}\n\n\t\t\t\tif ( !targetParentInserted ) {\n\t\t\t\t\tthis._markInsert( operation.targetPosition.parent, operation.getMovedRangeStart().offset, operation.howMany );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t\tcase 'rename': {\n\t\t\t\tif ( this._isInInsertedElement( operation.position.parent ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tthis._markRemove( operation.position.parent, operation.position.offset, 1 );\n\t\t\t\tthis._markInsert( operation.position.parent, operation.position.offset, 1 );\n\n\t\t\t\tconst range = Range.createFromPositionAndShift( operation.position, 1 );\n\n\t\t\t\tfor ( const marker of this._markerCollection.getMarkersIntersectingRange( range ) ) {\n\t\t\t\t\tconst markerRange = marker.getRange();\n\n\t\t\t\t\tthis.bufferMarkerChange( marker.name, markerRange, markerRange, marker.affectsData );\n\t\t\t\t}\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\n\t\t// Clear cache after each buffered operation as it is no longer valid.\n\t\tthis._cachedChanges = null;\n\t}\n\n\t/**\n\t * Buffers a marker change.\n\t *\n\t * @param {String} markerName The name of the marker that changed.\n\t * @param {module:engine/model/range~Range|null} oldRange Marker range before the change or `null` if the marker has just\n\t * been created.\n\t * @param {module:engine/model/range~Range|null} newRange Marker range after the change or `null` if the marker was removed.\n\t * @param {Boolean} affectsData Flag indicating whether marker affects the editor data.\n\t */\n\tbufferMarkerChange( markerName, oldRange, newRange, affectsData ) {\n\t\tconst buffered = this._changedMarkers.get( markerName );\n\n\t\tif ( !buffered ) {\n\t\t\tthis._changedMarkers.set( markerName, {\n\t\t\t\toldRange,\n\t\t\t\tnewRange,\n\t\t\t\taffectsData\n\t\t\t} );\n\t\t} else {\n\t\t\tbuffered.newRange = newRange;\n\t\t\tbuffered.affectsData = affectsData;\n\n\t\t\tif ( buffered.oldRange == null && buffered.newRange == null ) {\n\t\t\t\t// The marker is going to be removed (`newRange == null`) but it did not exist before the first buffered change\n\t\t\t\t// (`buffered.oldRange == null`). In this case, do not keep the marker in buffer at all.\n\t\t\t\tthis._changedMarkers.delete( markerName );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns all markers that should be removed as a result of buffered changes.\n\t *\n\t * @returns {Array.<Object>} Markers to remove. Each array item is an object containing the `name` and `range` properties.\n\t */\n\tgetMarkersToRemove() {\n\t\tconst result = [];\n\n\t\tfor ( const [ name, change ] of this._changedMarkers ) {\n\t\t\tif ( change.oldRange != null ) {\n\t\t\t\tresult.push( { name, range: change.oldRange } );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Returns all markers which should be added as a result of buffered changes.\n\t *\n\t * @returns {Array.<Object>} Markers to add. Each array item is an object containing the `name` and `range` properties.\n\t */\n\tgetMarkersToAdd() {\n\t\tconst result = [];\n\n\t\tfor ( const [ name, change ] of this._changedMarkers ) {\n\t\t\tif ( change.newRange != null ) {\n\t\t\t\tresult.push( { name, range: change.newRange } );\n\t\t\t}\n\t\t}\n\n\t\treturn result;\n\t}\n\n\t/**\n\t * Checks whether some of the buffered changes affect the editor data.\n\t *\n\t * Types of changes which affect the editor data:\n\t *\n\t * * model structure changes,\n\t * * attribute changes,\n\t * * changes of markers which were defined as `affectingData`.\n\t *\n\t * @returns {Boolean}\n\t */\n\thasDataChanges() {\n\t\tfor ( const [ , change ] of this._changedMarkers ) {\n\t\t\tif ( change.affectsData ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\n\t\t// If markers do not affect the data, check whether there are some changes in elements.\n\t\treturn this._changesInElement.size > 0;\n\t}\n\n\t/**\n\t * Calculates the diff between the old model tree state (the state before the first buffered operations since the last {@link #reset}\n\t * call) and the new model tree state (actual one). It should be called after all buffered operations are executed.\n\t *\n\t * The diff set is returned as an array of diff items, each describing a change done on the model. The items are sorted by\n\t * the position on which the change happened. If a position {@link module:engine/model/position~Position#isBefore is before}\n\t * another one, it will be on an earlier index in the diff set.\n\t *\n\t * Because calculating the diff is a costly operation, the result is cached. If no new operation was buffered since the\n\t * previous {@link #getChanges} call, the next call will return the cached value.\n\t *\n\t * @param {Object} options Additional options.\n\t * @param {Boolean} [options.includeChangesInGraveyard=false] If set to `true`, also changes that happened\n\t * in the graveyard root will be returned. By default, changes in the graveyard root are not returned.\n\t * @returns {Array.<Object>} Diff between the old and the new model tree state.\n\t */\n\tgetChanges( options = { includeChangesInGraveyard: false } ) {\n\t\t// If there are cached changes, just return them instead of calculating changes again.\n\t\tif ( this._cachedChanges ) {\n\t\t\tif ( options.includeChangesInGraveyard ) {\n\t\t\t\treturn this._cachedChangesWithGraveyard.slice();\n\t\t\t} else {\n\t\t\t\treturn this._cachedChanges.slice();\n\t\t\t}\n\t\t}\n\n\t\t// Will contain returned results.\n\t\tconst diffSet = [];\n\n\t\t// Check all changed elements.\n\t\tfor ( const element of this._changesInElement.keys() ) {\n\t\t\t// Get changes for this element and sort them.\n\t\t\tconst changes = this._changesInElement.get( element ).sort( ( a, b ) => {\n\t\t\t\tif ( a.offset === b.offset ) {\n\t\t\t\t\tif ( a.type != b.type ) {\n\t\t\t\t\t\t// If there are multiple changes at the same position, \"remove\" change should be first.\n\t\t\t\t\t\t// If the order is different, for example, we would first add some nodes and then removed them\n\t\t\t\t\t\t// (instead of the nodes that we should remove).\n\t\t\t\t\t\treturn a.type == 'remove' ? -1 : 1;\n\t\t\t\t\t}\n\n\t\t\t\t\treturn 0;\n\t\t\t\t}\n\n\t\t\t\treturn a.offset < b.offset ? -1 : 1;\n\t\t\t} );\n\n\t\t\t// Get children of this element before any change was applied on it.\n\t\t\tconst snapshotChildren = this._elementSnapshots.get( element );\n\t\t\t// Get snapshot of current element's children.\n\t\t\tconst elementChildren = _getChildrenSnapshot( element.getChildren() );\n\n\t\t\t// Generate actions basing on changes done on element.\n\t\t\tconst actions = _generateActionsFromChanges( snapshotChildren.length, changes );\n\n\t\t\tlet i = 0; // Iterator in `elementChildren` array -- iterates through current children of element.\n\t\t\tlet j = 0; // Iterator in `snapshotChildren` array -- iterates through old children of element.\n\n\t\t\t// Process every action.\n\t\t\tfor ( const action of actions ) {\n\t\t\t\tif ( action === 'i' ) {\n\t\t\t\t\t// Generate diff item for this element and insert it into the diff set.\n\t\t\t\t\tdiffSet.push( this._getInsertDiff( element, i, elementChildren[ i ].name ) );\n\n\t\t\t\t\ti++;\n\t\t\t\t} else if ( action === 'r' ) {\n\t\t\t\t\t// Generate diff item for this element and insert it into the diff set.\n\t\t\t\t\tdiffSet.push( this._getRemoveDiff( element, i, snapshotChildren[ j ].name ) );\n\n\t\t\t\t\tj++;\n\t\t\t\t} else if ( action === 'a' ) {\n\t\t\t\t\t// Take attributes from saved and current children.\n\t\t\t\t\tconst elementAttributes = elementChildren[ i ].attributes;\n\t\t\t\t\tconst snapshotAttributes = snapshotChildren[ j ].attributes;\n\t\t\t\t\tlet range;\n\n\t\t\t\t\tif ( elementChildren[ i ].name == '$text' ) {\n\t\t\t\t\t\trange = Range.createFromParentsAndOffsets( element, i, element, i + 1 );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tconst index = element.offsetToIndex( i );\n\t\t\t\t\t\trange = Range.createFromParentsAndOffsets( element, i, element.getChild( index ), 0 );\n\t\t\t\t\t}\n\n\t\t\t\t\t// Generate diff items for this change (there might be multiple attributes changed and\n\t\t\t\t\t// there is a single diff for each of them) and insert them into the diff set.\n\t\t\t\t\tdiffSet.push( ...this._getAttributesDiff( range, snapshotAttributes, elementAttributes ) );\n\n\t\t\t\t\ti++;\n\t\t\t\t\tj++;\n\t\t\t\t} else {\n\t\t\t\t\t// `action` is 'equal'. Child not changed.\n\t\t\t\t\ti++;\n\t\t\t\t\tj++;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\t// Then, sort the changes by the position (change at position before other changes is first).\n\t\tdiffSet.sort( ( a, b ) => {\n\t\t\t// If the change is in different root, we don't care much, but we'd like to have all changes in given\n\t\t\t// root \"together\" in the array. So let's just sort them by the root name. It does not matter which root\n\t\t\t// will be processed first.\n\t\t\tif ( a.position.root != b.position.root ) {\n\t\t\t\treturn a.position.root.rootName < b.position.root.rootName ? -1 : 1;\n\t\t\t}\n\n\t\t\t// If change happens at the same position...\n\t\t\tif ( a.position.isEqual( b.position ) ) {\n\t\t\t\t// Keep chronological order of operations.\n\t\t\t\treturn a.changeCount < b.changeCount ? -1 : 1;\n\t\t\t}\n\n\t\t\t// If positions differ, position \"on the left\" should be earlier in the result.\n\t\t\treturn a.position.isBefore( b.position ) ? -1 : 1;\n\t\t} );\n\n\t\t// Glue together multiple changes (mostly on text nodes).\n\t\tfor ( let i = 1; i < diffSet.length; i++ ) {\n\t\t\tconst prevDiff = diffSet[ i - 1 ];\n\t\t\tconst thisDiff = diffSet[ i ];\n\n\t\t\t// Glue remove changes if they happen on text on same position.\n\t\t\tconst isConsecutiveTextRemove =\n\t\t\t\tprevDiff.type == 'remove' && thisDiff.type == 'remove' &&\n\t\t\t\tprevDiff.name == '$text' && thisDiff.name == '$text' &&\n\t\t\t\tprevDiff.position.isEqual( thisDiff.position );\n\n\t\t\t// Glue insert changes if they happen on text on consecutive fragments.\n\t\t\tconst isConsecutiveTextAdd =\n\t\t\t\tprevDiff.type == 'insert' && thisDiff.type == 'insert' &&\n\t\t\t\tprevDiff.name == '$text' && thisDiff.name == '$text' &&\n\t\t\t\tprevDiff.position.parent == thisDiff.position.parent &&\n\t\t\t\tprevDiff.position.offset + prevDiff.length == thisDiff.position.offset;\n\n\t\t\t// Glue attribute changes if they happen on consecutive fragments and have same key, old value and new value.\n\t\t\tconst isConsecutiveAttributeChange =\n\t\t\t\tprevDiff.type == 'attribute' && thisDiff.type == 'attribute' &&\n\t\t\t\tprevDiff.position.parent == thisDiff.position.parent &&\n\t\t\t\tprevDiff.range.isFlat && thisDiff.range.isFlat &&\n\t\t\t\tprevDiff.position.offset + prevDiff.length == thisDiff.position.offset &&\n\t\t\t\tprevDiff.attributeKey == thisDiff.attributeKey &&\n\t\t\t\tprevDiff.attributeOldValue == thisDiff.attributeOldValue &&\n\t\t\t\tprevDiff.attributeNewValue == thisDiff.attributeNewValue;\n\n\t\t\tif ( isConsecutiveTextRemove || isConsecutiveTextAdd || isConsecutiveAttributeChange ) {\n\t\t\t\tdiffSet[ i - 1 ].length++;\n\n\t\t\t\tif ( isConsecutiveAttributeChange ) {\n\t\t\t\t\tdiffSet[ i - 1 ].range.end = diffSet[ i - 1 ].range.end.getShiftedBy( 1 );\n\t\t\t\t}\n\n\t\t\t\tdiffSet.splice( i, 1 );\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\n\t\t// Remove `changeCount` property from diff items. It is used only for sorting and is internal thing.\n\t\tfor ( const item of diffSet ) {\n\t\t\tdelete item.changeCount;\n\n\t\t\tif ( item.type == 'attribute' ) {\n\t\t\t\tdelete item.position;\n\t\t\t\tdelete item.length;\n\t\t\t}\n\t\t}\n\n\t\tthis._changeCount = 0;\n\n\t\t// Cache changes.\n\t\tthis._cachedChangesWithGraveyard = diffSet.slice();\n\t\tthis._cachedChanges = diffSet.slice().filter( _changesInGraveyardFilter );\n\n\t\tif ( options.includeChangesInGraveyard ) {\n\t\t\treturn this._cachedChangesWithGraveyard;\n\t\t} else {\n\t\t\treturn this._cachedChanges;\n\t\t}\n\t}\n\n\t/**\n\t * Resets `Differ`. Removes all buffered changes.\n\t */\n\treset() {\n\t\tthis._changesInElement.clear();\n\t\tthis._elementSnapshots.clear();\n\t\tthis._changedMarkers.clear();\n\t\tthis._cachedChanges = null;\n\t}\n\n\t/**\n\t * Saves and handles an insert change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_markInsert( parent, offset, howMany ) {\n\t\tconst changeItem = { type: 'insert', offset, howMany, count: this._changeCount++ };\n\n\t\tthis._markChange( parent, changeItem );\n\t}\n\n\t/**\n\t * Saves and handles a remove change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_markRemove( parent, offset, howMany ) {\n\t\tconst changeItem = { type: 'remove', offset, howMany, count: this._changeCount++ };\n\n\t\tthis._markChange( parent, changeItem );\n\n\t\tthis._removeAllNestedChanges( parent, offset, howMany );\n\t}\n\n\t/**\n\t * Saves and handles an attribute change.\n\t *\n\t * @private\n\t * @param {module:engine/model/item~Item} item\n\t */\n\t_markAttribute( item ) {\n\t\tconst changeItem = { type: 'attribute', offset: item.startOffset, howMany: item.offsetSize, count: this._changeCount++ };\n\n\t\tthis._markChange( item.parent, changeItem );\n\t}\n\n\t/**\n\t * Saves and handles a model change.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Object} changeItem\n\t */\n\t_markChange( parent, changeItem ) {\n\t\t// First, make a snapshot of this parent's children (it will be made only if it was not made before).\n\t\tthis._makeSnapshot( parent );\n\n\t\t// Then, get all changes that already were done on the element (empty array if this is the first change).\n\t\tconst changes = this._getChangesForElement( parent );\n\n\t\t// Then, look through all the changes, and transform them or the new change.\n\t\tthis._handleChange( changeItem, changes );\n\n\t\t// Add the new change.\n\t\tchanges.push( changeItem );\n\n\t\t// Remove incorrect changes. During transformation some change might be, for example, included in another.\n\t\t// In that case, the change will have `howMany` property set to `0` or less. We need to remove those changes.\n\t\tfor ( let i = 0; i < changes.length; i++ ) {\n\t\t\tif ( changes[ i ].howMany < 1 ) {\n\t\t\t\tchanges.splice( i, 1 );\n\n\t\t\t\ti--;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Gets an array of changes that have already been saved for a given element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element\n\t * @returns {Array.<Object>}\n\t */\n\t_getChangesForElement( element ) {\n\t\tlet changes;\n\n\t\tif ( this._changesInElement.has( element ) ) {\n\t\t\tchanges = this._changesInElement.get( element );\n\t\t} else {\n\t\t\tchanges = [];\n\n\t\t\tthis._changesInElement.set( element, changes );\n\t\t}\n\n\t\treturn changes;\n\t}\n\n\t/**\n\t * Saves a children snapshot for a given element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element\n\t */\n\t_makeSnapshot( element ) {\n\t\tif ( !this._elementSnapshots.has( element ) ) {\n\t\t\tthis._elementSnapshots.set( element, _getChildrenSnapshot( element.getChildren() ) );\n\t\t}\n\t}\n\n\t/**\n\t * For a given newly saved change, compares it with a change already done on the element and modifies the incoming\n\t * change and/or the old change.\n\t *\n\t * @private\n\t * @param {Object} inc Incoming (new) change.\n\t * @param {Array.<Object>} changes An array containing all the changes done on that element.\n\t */\n\t_handleChange( inc, changes ) {\n\t\t// We need a helper variable that will store how many nodes are to be still handled for this change item.\n\t\t// `nodesToHandle` (how many nodes still need to be handled) and `howMany` (how many nodes were affected)\n\t\t// needs to be differentiated.\n\t\t//\n\t\t// This comes up when there are multiple changes that are affected by `inc` change item.\n\t\t//\n\t\t// For example: assume two insert changes: `{ offset: 2, howMany: 1 }` and `{ offset: 5, howMany: 1 }`.\n\t\t// Assume that `inc` change is remove `{ offset: 2, howMany: 2, nodesToHandle: 2 }`.\n\t\t//\n\t\t// Then, we:\n\t\t// - \"forget\" about first insert change (it is \"eaten\" by remove),\n\t\t// - because of that, at the end we will want to remove only one node (`nodesToHandle = 1`),\n\t\t// - but still we have to change offset of the second insert change from `5` to `3`!\n\t\t//\n\t\t// So, `howMany` does not change throughout items transformation and keeps information about how many nodes were affected,\n\t\t// while `nodesToHandle` means how many nodes need to be handled after the change item is transformed by other changes.\n\t\tinc.nodesToHandle = inc.howMany;\n\n\t\tfor ( const old of changes ) {\n\t\t\tconst incEnd = inc.offset + inc.howMany;\n\t\t\tconst oldEnd = old.offset + old.howMany;\n\n\t\t\tif ( inc.type == 'insert' ) {\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\told.howMany += inc.nodesToHandle;\n\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'remove' ) {\n\t\t\t\t\tif ( inc.offset < old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\told.offset += inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\t// This case is more complicated, because attribute change has to be split into two.\n\t\t\t\t\t\t// Example (assume that uppercase and lowercase letters mean different attributes):\n\t\t\t\t\t\t//\n\t\t\t\t\t\t// initial state:\t\tabcxyz\n\t\t\t\t\t\t// attribute change:\taBCXYz\n\t\t\t\t\t\t// incoming insert:\t\taBCfooXYz\n\t\t\t\t\t\t//\n\t\t\t\t\t\t// Change ranges cannot intersect because each item has to be described exactly (it was either\n\t\t\t\t\t\t// not changed, inserted, removed, or its attribute was changed). That's why old attribute\n\t\t\t\t\t\t// change has to be split and both parts has to be handled separately from now on.\n\t\t\t\t\t\tconst howMany = old.howMany;\n\n\t\t\t\t\t\told.howMany = inc.offset - old.offset;\n\n\t\t\t\t\t\t// Add the second part of attribute change to the beginning of processed array so it won't\n\t\t\t\t\t\t// be processed again in this loop.\n\t\t\t\t\t\tchanges.unshift( {\n\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\toffset: incEnd,\n\t\t\t\t\t\t\thowMany: howMany - old.howMany,\n\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t} );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( inc.type == 'remove' ) {\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( incEnd <= oldEnd ) {\n\t\t\t\t\t\tif ( inc.offset < old.offset ) {\n\t\t\t\t\t\t\tconst intersectionLength = incEnd - old.offset;\n\n\t\t\t\t\t\t\told.offset = inc.offset;\n\n\t\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t\t\tinc.nodesToHandle -= intersectionLength;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\told.howMany -= inc.nodesToHandle;\n\t\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t} else {\n\t\t\t\t\t\tif ( inc.offset <= old.offset ) {\n\t\t\t\t\t\t\tinc.nodesToHandle -= old.howMany;\n\t\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\t\tconst intersectionLength = oldEnd - inc.offset;\n\n\t\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t\t\tinc.nodesToHandle -= intersectionLength;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'remove' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < old.offset ) {\n\t\t\t\t\t\tinc.nodesToHandle += old.howMany;\n\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\tif ( incEnd <= old.offset ) {\n\t\t\t\t\t\told.offset -= inc.howMany;\n\t\t\t\t\t} else if ( inc.offset < old.offset ) {\n\t\t\t\t\t\tconst intersectionLength = incEnd - old.offset;\n\n\t\t\t\t\t\told.offset = inc.offset;\n\t\t\t\t\t\told.howMany -= intersectionLength;\n\t\t\t\t\t} else if ( inc.offset < oldEnd ) {\n\t\t\t\t\t\tif ( incEnd <= oldEnd ) {\n\t\t\t\t\t\t\t// On first sight in this case we don't need to split attribute operation into two.\n\t\t\t\t\t\t\t// However the changes set is later converted to actions (see `_generateActionsFromChanges`).\n\t\t\t\t\t\t\t// For that reason, no two changes may intersect.\n\t\t\t\t\t\t\t// So we cannot have an attribute change that \"contains\" remove change.\n\t\t\t\t\t\t\t// Attribute change needs to be split.\n\t\t\t\t\t\t\tconst howMany = old.howMany;\n\n\t\t\t\t\t\t\told.howMany = inc.offset - old.offset;\n\n\t\t\t\t\t\t\tconst howManyAfter = howMany - old.howMany - inc.nodesToHandle;\n\n\t\t\t\t\t\t\t// Add the second part of attribute change to the beginning of processed array so it won't\n\t\t\t\t\t\t\t// be processed again in this loop.\n\t\t\t\t\t\t\tchanges.unshift( {\n\t\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\t\toffset: inc.offset,\n\t\t\t\t\t\t\t\thowMany: howManyAfter,\n\t\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t\t} );\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\told.howMany -= oldEnd - inc.offset;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( inc.type == 'attribute' ) {\n\t\t\t\t// In case of attribute change, `howMany` should be kept same as `nodesToHandle`. It's not an error.\n\t\t\t\tif ( old.type == 'insert' ) {\n\t\t\t\t\tif ( inc.offset < old.offset && incEnd > old.offset ) {\n\t\t\t\t\t\tif ( incEnd > oldEnd ) {\n\t\t\t\t\t\t\t// This case is similar to a case described when incoming change was insert and old change was attribute.\n\t\t\t\t\t\t\t// See comment above.\n\t\t\t\t\t\t\t//\n\t\t\t\t\t\t\t// This time incoming change is attribute. We need to split incoming change in this case too.\n\t\t\t\t\t\t\t// However this time, the second part of the attribute change needs to be processed further\n\t\t\t\t\t\t\t// because there might be other changes that it collides with.\n\t\t\t\t\t\t\tconst attributePart = {\n\t\t\t\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\t\t\t\toffset: oldEnd,\n\t\t\t\t\t\t\t\thowMany: incEnd - oldEnd,\n\t\t\t\t\t\t\t\tcount: this._changeCount++\n\t\t\t\t\t\t\t};\n\n\t\t\t\t\t\t\tthis._handleChange( attributePart, changes );\n\n\t\t\t\t\t\t\tchanges.push( attributePart );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\tinc.nodesToHandle = old.offset - inc.offset;\n\t\t\t\t\t\tinc.howMany = inc.nodesToHandle;\n\t\t\t\t\t} else if ( inc.offset >= old.offset && inc.offset < oldEnd ) {\n\t\t\t\t\t\tif ( incEnd > oldEnd ) {\n\t\t\t\t\t\t\tinc.nodesToHandle = incEnd - oldEnd;\n\t\t\t\t\t\t\tinc.offset = oldEnd;\n\t\t\t\t\t\t} else {\n\t\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\tif ( old.type == 'attribute' ) {\n\t\t\t\t\t// There are only two conflicting scenarios possible here:\n\t\t\t\t\tif ( inc.offset >= old.offset && incEnd <= oldEnd ) {\n\t\t\t\t\t\t// `old` change includes `inc` change, or they are the same.\n\t\t\t\t\t\tinc.nodesToHandle = 0;\n\t\t\t\t\t\tinc.howMany = 0;\n\t\t\t\t\t\tinc.offset = 0;\n\t\t\t\t\t} else if ( inc.offset <= old.offset && incEnd >= oldEnd ) {\n\t\t\t\t\t\t// `inc` change includes `old` change.\n\t\t\t\t\t\told.howMany = 0;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tinc.howMany = inc.nodesToHandle;\n\t\tdelete inc.nodesToHandle;\n\t}\n\n\t/**\n\t * Returns an object with a single insert change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent The element in which the change happened.\n\t * @param {Number} offset The offset at which change happened.\n\t * @param {String} name The name of the removed element or `'$text'` for a character.\n\t * @returns {Object} The diff item.\n\t */\n\t_getInsertDiff( parent, offset, name ) {\n\t\treturn {\n\t\t\ttype: 'insert',\n\t\t\tposition: Position.createFromParentAndOffset( parent, offset ),\n\t\t\tname,\n\t\t\tlength: 1,\n\t\t\tchangeCount: this._changeCount++\n\t\t};\n\t}\n\n\t/**\n\t * Returns an object with a single remove change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent The element in which change happened.\n\t * @param {Number} offset The offset at which change happened.\n\t * @param {String} name The name of the removed element or `'$text'` for a character.\n\t * @returns {Object} The diff item.\n\t */\n\t_getRemoveDiff( parent, offset, name ) {\n\t\treturn {\n\t\t\ttype: 'remove',\n\t\t\tposition: Position.createFromParentAndOffset( parent, offset ),\n\t\t\tname,\n\t\t\tlength: 1,\n\t\t\tchangeCount: this._changeCount++\n\t\t};\n\t}\n\n\t/**\n\t * Returns an array of objects where each one is a single attribute change description.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range The range where the change happened.\n\t * @param {Map} oldAttributes A map, map iterator or compatible object that contains attributes before the change.\n\t * @param {Map} newAttributes A map, map iterator or compatible object that contains attributes after the change.\n\t * @returns {Array.<Object>} An array containing one or more diff items.\n\t */\n\t_getAttributesDiff( range, oldAttributes, newAttributes ) {\n\t\t// Results holder.\n\t\tconst diffs = [];\n\n\t\t// Clone new attributes as we will be performing changes on this object.\n\t\tnewAttributes = new Map( newAttributes );\n\n\t\t// Look through old attributes.\n\t\tfor ( const [ key, oldValue ] of oldAttributes ) {\n\t\t\t// Check what is the new value of the attribute (or if it was removed).\n\t\t\tconst newValue = newAttributes.has( key ) ? newAttributes.get( key ) : null;\n\n\t\t\t// If values are different (or attribute was removed)...\n\t\t\tif ( newValue !== oldValue ) {\n\t\t\t\t// Add diff item.\n\t\t\t\tdiffs.push( {\n\t\t\t\t\ttype: 'attribute',\n\t\t\t\t\tposition: range.start,\n\t\t\t\t\trange: Range.createFromRange( range ),\n\t\t\t\t\tlength: 1,\n\t\t\t\t\tattributeKey: key,\n\t\t\t\t\tattributeOldValue: oldValue,\n\t\t\t\t\tattributeNewValue: newValue,\n\t\t\t\t\tchangeCount: this._changeCount++\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Prevent returning two diff items for the same change.\n\t\t\tnewAttributes.delete( key );\n\t\t}\n\n\t\t// Look through new attributes that weren't handled above.\n\t\tfor ( const [ key, newValue ] of newAttributes ) {\n\t\t\t// Each of them is a new attribute. Add diff item.\n\t\t\tdiffs.push( {\n\t\t\t\ttype: 'attribute',\n\t\t\t\tposition: range.start,\n\t\t\t\trange: Range.createFromRange( range ),\n\t\t\t\tlength: 1,\n\t\t\t\tattributeKey: key,\n\t\t\t\tattributeOldValue: null,\n\t\t\t\tattributeNewValue: newValue,\n\t\t\t\tchangeCount: this._changeCount++\n\t\t\t} );\n\t\t}\n\n\t\treturn diffs;\n\t}\n\n\t/**\n\t * Checks whether given element or any of its parents is an element that is buffered as an inserted element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element Element to check.\n\t * @returns {Boolean}\n\t */\n\t_isInInsertedElement( element ) {\n\t\tconst parent = element.parent;\n\n\t\tif ( !parent ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst changes = this._changesInElement.get( parent );\n\t\tconst offset = element.startOffset;\n\n\t\tif ( changes ) {\n\t\t\tfor ( const change of changes ) {\n\t\t\t\tif ( change.type == 'insert' && offset >= change.offset && offset < change.offset + change.howMany ) {\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn this._isInInsertedElement( parent );\n\t}\n\n\t/**\n\t * Removes deeply all buffered changes that are registered in elements from range specified by `parent`, `offset`\n\t * and `howMany`.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @param {Number} howMany\n\t */\n\t_removeAllNestedChanges( parent, offset, howMany ) {\n\t\tconst range = Range.createFromParentsAndOffsets( parent, offset, parent, offset + howMany );\n\n\t\tfor ( const item of range.getItems( { shallow: true } ) ) {\n\t\t\tif ( item.is( 'element' ) ) {\n\t\t\t\tthis._elementSnapshots.delete( item );\n\t\t\t\tthis._changesInElement.delete( item );\n\n\t\t\t\tthis._removeAllNestedChanges( item, 0, item.maxOffset );\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Returns an array that is a copy of passed child list with the exception that text nodes are split to one or more\n// objects, each representing one character and attributes set on that character.\nfunction _getChildrenSnapshot( children ) {\n\tconst snapshot = [];\n\n\tfor ( const child of children ) {\n\t\tif ( child.is( 'text' ) ) {\n\t\t\tfor ( let i = 0; i < child.data.length; i++ ) {\n\t\t\t\tsnapshot.push( {\n\t\t\t\t\tname: '$text',\n\t\t\t\t\tattributes: new Map( child.getAttributes() )\n\t\t\t\t} );\n\t\t\t}\n\t\t} else {\n\t\t\tsnapshot.push( {\n\t\t\t\tname: child.name,\n\t\t\t\tattributes: new Map( child.getAttributes() )\n\t\t\t} );\n\t\t}\n\t}\n\n\treturn snapshot;\n}\n\n// Generates array of actions for given changes set.\n// It simulates what `diff` function does.\n// Generated actions are:\n// - 'e' for 'equal' - when item at that position did not change,\n// - 'i' for 'insert' - when item at that position was inserted,\n// - 'r' for 'remove' - when item at that position was removed,\n// - 'a' for 'attribute' - when item at that position has it attributes changed.\n//\n// Example (assume that uppercase letters have bold attribute, compare with function code):\n//\n// children before:\tfooBAR\n// children after:\tfoxybAR\n//\n// changes: type: remove, offset: 1, howMany: 1\n//\t\t\ttype: insert, offset: 2, howMany: 2\n//\t\t\ttype: attribute, offset: 4, howMany: 1\n//\n// expected actions: equal (f), remove (o), equal (o), insert (x), insert (y), attribute (b), equal (A), equal (R)\n//\n// steps taken by th script:\n//\n// 1. change = \"type: remove, offset: 1, howMany: 1\"; offset = 0; oldChildrenHandled = 0\n//    1.1 between this change and the beginning is one not-changed node, fill with one equal action, one old child has been handled\n//    1.2 this change removes one node, add one remove action\n//    1.3 change last visited `offset` to 1\n//    1.4 since an old child has been removed, one more old child has been handled\n//    1.5 actions at this point are: equal, remove\n//\n// 2. change = \"type: insert, offset: 2, howMany: 2\"; offset = 1; oldChildrenHandled = 2\n//    2.1 between this change and previous change is one not-changed node, add equal action, another one old children has been handled\n//    2.2 this change inserts two nodes, add two insert actions\n//    2.3 change last visited offset to the end of the inserted range, that is 4\n//    2.4 actions at this point are: equal, remove, equal, insert, insert\n//\n// 3. change = \"type: attribute, offset: 4, howMany: 1\"; offset = 4, oldChildrenHandled = 3\n//    3.1 between this change and previous change are no not-changed nodes\n//    3.2 this change changes one node, add one attribute action\n//    3.3 change last visited `offset` to the end of change range, that is 5\n//    3.4 since an old child has been changed, one more old child has been handled\n//    3.5 actions at this point are: equal, remove, equal, insert, insert, attribute\n//\n// 4. after loop oldChildrenHandled = 4, oldChildrenLength = 6 (fooBAR is 6 characters)\n//    4.1 fill up with two equal actions\n//\n// The result actions are: equal, remove, equal, insert, insert, attribute, equal, equal.\nfunction _generateActionsFromChanges( oldChildrenLength, changes ) {\n\tconst actions = [];\n\n\tlet offset = 0;\n\tlet oldChildrenHandled = 0;\n\n\t// Go through all buffered changes.\n\tfor ( const change of changes ) {\n\t\t// First, fill \"holes\" between changes with \"equal\" actions.\n\t\tif ( change.offset > offset ) {\n\t\t\tactions.push( ...'e'.repeat( change.offset - offset ).split( '' ) );\n\n\t\t\toldChildrenHandled += change.offset - offset;\n\t\t}\n\n\t\t// Then, fill up actions accordingly to change type.\n\t\tif ( change.type == 'insert' ) {\n\t\t\tactions.push( ...'i'.repeat( change.howMany ).split( '' ) );\n\n\t\t\t// The last handled offset is after inserted range.\n\t\t\toffset = change.offset + change.howMany;\n\t\t} else if ( change.type == 'remove' ) {\n\t\t\tactions.push( ...'r'.repeat( change.howMany ).split( '' ) );\n\n\t\t\t// The last handled offset is at the position where the nodes were removed.\n\t\t\toffset = change.offset;\n\t\t\t// We removed `howMany` old nodes, update `oldChildrenHandled`.\n\t\t\toldChildrenHandled += change.howMany;\n\t\t} else {\n\t\t\tactions.push( ...'a'.repeat( change.howMany ).split( '' ) );\n\n\t\t\t// The last handled offset isa at the position after the changed range.\n\t\t\toffset = change.offset + change.howMany;\n\t\t\t// We changed `howMany` old nodes, update `oldChildrenHandled`.\n\t\t\toldChildrenHandled += change.howMany;\n\t\t}\n\t}\n\n\t// Fill \"equal\" actions at the end of actions set. Use `oldChildrenHandled` to see how many children\n\t// has not been changed / removed at the end of their parent.\n\tif ( oldChildrenHandled < oldChildrenLength ) {\n\t\tactions.push( ...'e'.repeat( oldChildrenLength - oldChildrenHandled ).split( '' ) );\n\t}\n\n\treturn actions;\n}\n\n// Filter callback for Array.filter that filters out change entries that are in graveyard.\nfunction _changesInGraveyardFilter( entry ) {\n\tconst posInGy = entry.position && entry.position.root.rootName == '$graveyard';\n\tconst rangeInGy = entry.range && entry.range.root.rootName == '$graveyard';\n\n\treturn !posInGy && !rangeInGy;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/history\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * `History` keeps the track of all the deltas applied to the {@link module:engine/model/document~Document document}.\n */\nexport default class History {\n\t/**\n\t * Creates an empty History instance.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Deltas added to the history.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/model/delta/delta~Delta>} module:engine/model/history~History#_deltas\n\t\t */\n\t\tthis._deltas = [];\n\n\t\t/**\n\t\t * Helper structure that maps added delta's base version to the index in {@link module:engine/model/history~History#_deltas}\n\t\t * at which the delta was added.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} module:engine/model/history~History#_historyPoints\n\t\t */\n\t\tthis._historyPoints = new Map();\n\n\t\t/**\n\t\t * Holds an information which {@link module:engine/model/delta/delta~Delta delta} undoes which\n\t\t * {@link module:engine/model/delta/delta~Delta delta}.\n\t\t *\n\t\t * Keys of the map are \"undoing deltas\", that is deltas that undone some other deltas. For each key, the\n\t\t * value is a delta that has been undone by the \"undoing delta\".\n\t\t *\n\t\t * @private\n\t\t * @member {Map} module:engine/model/history~History#_undoPairs\n\t\t */\n\t\tthis._undoPairs = new Map();\n\n\t\t/**\n\t\t * Holds all undone deltas.\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<module:engine/model/delta/delta~Delta>} module:engine/model/history~History#_undoneDeltas\n\t\t */\n\t\tthis._undoneDeltas = new Set();\n\t}\n\n\t/**\n\t * Adds delta to the history.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} delta Delta to add.\n\t */\n\taddDelta( delta ) {\n\t\tif ( delta.operations.length > 0 && !this._historyPoints.has( delta.baseVersion ) ) {\n\t\t\tconst index = this._deltas.length;\n\n\t\t\tthis._deltas[ index ] = delta;\n\t\t\tthis._historyPoints.set( delta.baseVersion, index );\n\t\t}\n\t}\n\n\t/**\n\t * Returns deltas added to the history.\n\t *\n\t * @param {Number} [from=0] Base version from which deltas should be returned (inclusive). Defaults to `0`, which means\n\t * that deltas from the first one will be returned.\n\t * @param {Number} [to=Number.POSITIVE_INFINITY] Base version up to which deltas should be returned (exclusive).\n\t * Defaults to `Number.POSITIVE_INFINITY` which means that deltas up to the last one will be returned.\n\t * @returns {Iterable.<module:engine/model/delta/delta~Delta>} Deltas added to the history from given base versions range.\n\t */\n\t* getDeltas( from = 0, to = Number.POSITIVE_INFINITY ) {\n\t\t// No deltas added, nothing to yield.\n\t\tif ( this._deltas.length === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Will throw if base version is incorrect.\n\t\tlet fromIndex = this._getIndex( from );\n\n\t\t// Base version is too low or too high and is not found in history.\n\t\tif ( fromIndex == -1 ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// We have correct `fromIndex` so let's iterate starting from it.\n\t\twhile ( fromIndex < this._deltas.length ) {\n\t\t\tconst delta = this._deltas[ fromIndex++ ];\n\n\t\t\tif ( delta.baseVersion >= to ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\tyield delta;\n\t\t}\n\t}\n\n\t/**\n\t * Returns delta from history that bases on given `baseVersion`.\n\t *\n\t * @param {Number} baseVersion Base version of the delta to get.\n\t * @returns {module:engine/model/delta/delta~Delta|null} Delta with given base version or `null` if there is no such delta in history.\n\t */\n\tgetDelta( baseVersion ) {\n\t\tconst index = this._historyPoints.get( baseVersion );\n\n\t\treturn index === undefined ? null : this._deltas[ index ];\n\t}\n\n\t/**\n\t * Marks in history that one delta is a delta that is undoing the other delta. By marking deltas this way,\n\t * history is keeping more context information about deltas which helps in operational transformation.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} undoneDelta Delta which is undone by `undoingDelta`.\n\t * @param {module:engine/model/delta/delta~Delta} undoingDelta Delta which undoes `undoneDelta`.\n\t */\n\tsetDeltaAsUndone( undoneDelta, undoingDelta ) {\n\t\tthis._undoPairs.set( undoingDelta, undoneDelta );\n\t\tthis._undoneDeltas.add( undoneDelta );\n\t}\n\n\t/**\n\t * Checks whether given `delta` is undoing by any other delta.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} delta Delta to check.\n\t * @returns {Boolean} `true` if given `delta` is undoing any other delta, `false` otherwise.\n\t */\n\tisUndoingDelta( delta ) {\n\t\treturn this._undoPairs.has( delta );\n\t}\n\n\t/**\n\t * Checks whether given `delta` has been undone by any other delta.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} delta Delta to check.\n\t * @returns {Boolean} `true` if given `delta` has been undone any other delta, `false` otherwise.\n\t */\n\tisUndoneDelta( delta ) {\n\t\treturn this._undoneDeltas.has( delta );\n\t}\n\n\t/**\n\t * For given `undoingDelta`, returns the delta which has been undone by it.\n\t *\n\t * @param {module:engine/model/delta/delta~Delta} undoingDelta\n\t * @returns {module:engine/model/delta/delta~Delta|undefined} Delta that has been undone by given `undoingDelta` or `undefined`\n\t * if given `undoingDelta` is not undoing any other delta.\n\t */\n\tgetUndoneDelta( undoingDelta ) {\n\t\treturn this._undoPairs.get( undoingDelta );\n\t}\n\n\t/**\n\t * Gets an index in {@link module:engine/model/history~History#_deltas} where delta with given `baseVersion` is added.\n\t *\n\t * @private\n\t * @param {Number} baseVersion Base version of delta.\n\t */\n\t_getIndex( baseVersion ) {\n\t\tconst index = this._historyPoints.get( baseVersion );\n\n\t\t// Base version not found - it is either too high or too low, or is in the middle of delta.\n\t\tif ( index === undefined ) {\n\t\t\tconst lastDelta = this._deltas[ this._deltas.length - 1 ];\n\t\t\tconst nextBaseVersion = lastDelta.baseVersion + lastDelta.operations.length;\n\n\t\t\tif ( baseVersion < 0 || baseVersion >= nextBaseVersion ) {\n\t\t\t\t// Base version is too high or too low - it's acceptable situation.\n\t\t\t\treturn -1;\n\t\t\t}\n\n\t\t\t/**\n\t\t\t * Given base version points to the middle of a delta.\n\t\t\t *\n\t\t\t * @error history-wrong-version\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'model-history-wrong-version: Given base version points to the middle of a delta.' );\n\t\t}\n\n\t\treturn index;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * Set of utils to handle unicode characters.\n *\n * @module utils/unicode\n */\n\n/**\n * Checks whether given `character` is a combining mark.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isCombiningMark( character ) {\n\treturn !!character && character.length == 1 && /[\\u0300-\\u036f\\u1ab0-\\u1aff\\u1dc0-\\u1dff\\u20d0-\\u20ff\\ufe20-\\ufe2f]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a high half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isHighSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\ud800-\\udbff]/.test( character );\n}\n\n/**\n * Checks whether given `character` is a low half of surrogate pair.\n *\n * Using UTF-16 terminology, a surrogate pair denotes UTF-16 character using two UTF-8 characters. The surrogate pair\n * consist of high surrogate pair character followed by low surrogate pair character.\n *\n * @param {String} character Character to check.\n * @returns {Boolean}\n */\nexport function isLowSurrogateHalf( character ) {\n\treturn !!character && character.length == 1 && /[\\udc00-\\udfff]/.test( character );\n}\n\n/**\n * Checks whether given offset in a string is inside a surrogate pair (between two surrogate halves).\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideSurrogatePair( string, offset ) {\n\treturn isHighSurrogateHalf( string.charAt( offset - 1 ) ) && isLowSurrogateHalf( string.charAt( offset ) );\n}\n\n/**\n * Checks whether given offset in a string is between base character and combining mark or between two combining marks.\n *\n * @param {String} string String to check.\n * @param {Number} offset Offset to check.\n * @returns {Boolean}\n */\nexport function isInsideCombinedSymbol( string, offset ) {\n\treturn isCombiningMark( string.charAt( offset ) );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/document\n */\n\nimport Differ from './differ';\nimport Range from './range';\nimport Position from './position';\nimport RootElement from './rootelement';\nimport History from './history';\nimport DocumentSelection from './documentselection';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport clone from '@ckeditor/ckeditor5-utils/src/lib/lodash/clone';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport { isInsideSurrogatePair, isInsideCombinedSymbol } from '@ckeditor/ckeditor5-utils/src/unicode';\n\nconst graveyardName = '$graveyard';\n\n/**\n * Data model's document. It contains the model's structure, its selection and the history of changes.\n *\n * Read more about working with the model in\n * {@glink framework/guides/architecture/editing-engine#model introduction to the the editing engine's architecture}.\n *\n * Usually, the document contains just one {@link module:engine/model/document~Document#roots root element}, so\n * you can retrieve it by just calling {@link module:engine/model/document~Document#getRoot} without specifying its name:\n *\n *\t\tmodel.document.getRoot(); // -> returns the main root\n *\n * However, the document may contain multiple roots – e.g. when the editor has multiple editable areas\n * (e.g. a title and a body of a message).\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Document {\n\t/**\n\t * Creates an empty document instance with no {@link #roots} (other than\n\t * the {@link #graveyard graveyard root}).\n\t */\n\tconstructor( model ) {\n\t\t/**\n\t\t * The {@link module:engine/model/model~Model model} that the document is a part of.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The document version. It starts from `0` and every operation increases the version number. It is used to ensure that\n\t\t * operations are applied on a proper document version.\n\t\t *\n\t\t * If the {@link module:engine/model/operation/operation~Operation#baseVersion base version} does not match the document version,\n\t\t * a {@link module:utils/ckeditorerror~CKEditorError model-document-applyOperation-wrong-version} error is thrown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.version = 0;\n\n\t\t/**\n\t\t * The document's history.\n\t\t *\n\t\t * **Note:** Be aware that deltas applied to the document might get removed or changed.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/history~History}\n\t\t */\n\t\tthis.history = new History( this );\n\n\t\t/**\n\t\t * The selection in this document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/documentselection~DocumentSelection}\n\t\t */\n\t\tthis.selection = new DocumentSelection( this );\n\n\t\t/**\n\t\t * A list of roots that are owned and managed by this document. Use {@link #createRoot} and\n\t\t * {@link #getRoot} to manipulate it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/collection~Collection}\n\t\t */\n\t\tthis.roots = new Collection( { idProperty: 'rootName' } );\n\n\t\t/**\n\t\t * The model differ object. Its role is to buffer changes done on the model document and then calculate a diff of those changes.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/differ~Differ}\n\t\t */\n\t\tthis.differ = new Differ( model.markers );\n\n\t\t/**\n\t\t * Post-fixer callbacks registered to the model document.\n\t\t *\n\t\t * @private\n\t\t * @member {Set}\n\t\t */\n\t\tthis._postFixers = new Set();\n\n\t\t// Graveyard tree root. Document always have a graveyard root, which stores removed nodes.\n\t\tthis.createRoot( '$root', graveyardName );\n\n\t\t// First, if the operation is a document operation check if it's base version is correct.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation && operation.baseVersion !== this.version ) {\n\t\t\t\t/**\n\t\t\t\t * Only operations with matching versions can be applied.\n\t\t\t\t *\n\t\t\t\t * @error document-applyOperation-wrong-version\n\t\t\t\t * @param {module:engine/model/operation/operation~Operation} operation\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'model-document-applyOperation-wrong-version: Only operations with matching versions can be applied.',\n\t\t\t\t\t{ operation }\n\t\t\t\t);\n\t\t\t}\n\t\t}, { priority: 'highest' } );\n\n\t\t// Then, still before an operation is applied on model, buffer the change in differ.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation ) {\n\t\t\t\tthis.differ.bufferOperation( operation );\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\n\t\t// After the operation is applied, bump document's version and add the operation to the history.\n\t\tthis.listenTo( model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( operation.isDocumentOperation ) {\n\t\t\t\tthis.version++;\n\t\t\t\tthis.history.addDelta( operation.delta );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// Listen to selection changes. If selection changed, mark it.\n\t\tlet hasSelectionChanged = false;\n\n\t\tthis.listenTo( this.selection, 'change', () => {\n\t\t\thasSelectionChanged = true;\n\t\t} );\n\n\t\t// Wait for `_change` event from model, which signalizes that outermost change block has finished.\n\t\t// When this happens, check if there were any changes done on document, and if so, call post-fixers,\n\t\t// fire `change` event for features and conversion and then reset the differ.\n\t\t// Fire `change:data` event when at least one operation or buffered marker changes the data.\n\t\tthis.listenTo( model, '_change', ( evt, writer ) => {\n\t\t\tif ( !this.differ.isEmpty || hasSelectionChanged ) {\n\t\t\t\tthis._callPostFixers( writer );\n\n\t\t\t\tif ( this.differ.hasDataChanges() ) {\n\t\t\t\t\tthis.fire( 'change:data', writer.batch );\n\t\t\t\t} else {\n\t\t\t\t\tthis.fire( 'change', writer.batch );\n\t\t\t\t}\n\n\t\t\t\tthis.differ.reset();\n\t\t\t\thasSelectionChanged = false;\n\t\t\t}\n\t\t} );\n\n\t\t// Buffer marker changes.\n\t\t// This is not covered in buffering operations because markers may change outside of them (when they\n\t\t// are modified using `model.markers` collection, not through `MarkerOperation`).\n\t\tthis.listenTo( model.markers, 'update', ( evt, marker, oldRange, newRange ) => {\n\t\t\t// Whenever marker is updated, buffer that change.\n\t\t\tthis.differ.bufferMarkerChange( marker.name, oldRange, newRange, marker.affectsData );\n\n\t\t\tif ( oldRange === null ) {\n\t\t\t\t// If this is a new marker, add a listener that will buffer change whenever marker changes.\n\t\t\t\tmarker.on( 'change', ( evt, oldRange ) => {\n\t\t\t\t\tthis.differ.bufferMarkerChange( marker.name, oldRange, marker.getRange(), marker.affectsData );\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * The graveyard tree root. A document always has a graveyard root that stores removed nodes.\n\t *\n\t * @readonly\n\t * @member {module:engine/model/rootelement~RootElement}\n\t */\n\tget graveyard() {\n\t\treturn this.getRoot( graveyardName );\n\t}\n\n\t/**\n\t * Creates a new root.\n\t *\n\t * @param {String} [elementName='$root'] The element name. Defaults to `'$root'` which also has some basic schema defined\n\t * (`$block`s are allowed inside the `$root`). Make sure to define a proper schema if you use a different name.\n\t * @param {String} [rootName='main'] A unique root name.\n\t * @returns {module:engine/model/rootelement~RootElement} The created root.\n\t */\n\tcreateRoot( elementName = '$root', rootName = 'main' ) {\n\t\tif ( this.roots.get( rootName ) ) {\n\t\t\t/**\n\t\t\t * A root with the specified name already exists.\n\t\t\t *\n\t\t\t * @error model-document-createRoot-name-exists\n\t\t\t * @param {module:engine/model/document~Document} doc\n\t\t\t * @param {String} name\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-document-createRoot-name-exists: Root with specified name already exists.',\n\t\t\t\t{ name: rootName }\n\t\t\t);\n\t\t}\n\n\t\tconst root = new RootElement( this, elementName, rootName );\n\t\tthis.roots.add( root );\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * Removes all event listeners set by the document instance.\n\t */\n\tdestroy() {\n\t\tthis.selection.destroy();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Returns a root by its name.\n\t *\n\t * @param {String} [name='main'] A unique root name.\n\t * @returns {module:engine/model/rootelement~RootElement|null} The root registered under a given name or `null` when\n\t * there is no root with the given name.\n\t */\n\tgetRoot( name = 'main' ) {\n\t\treturn this.roots.get( name );\n\t}\n\n\t/**\n\t * Returns an array with names of all roots (without the {@link #graveyard}) added to the document.\n\t *\n\t * @returns {Array.<String>} Roots names.\n\t */\n\tgetRootNames() {\n\t\treturn Array.from( this.roots, root => root.rootName ).filter( name => name != graveyardName );\n\t}\n\n\t/**\n\t * Used to register a post-fixer callback. A post-fixer mechanism guarantees that the features that listen to\n\t * the {@link module:engine/model/model~Model#event:_change model's change event} will operate on a correct model state.\n\t *\n\t * An execution of a feature may lead to an incorrect document tree state. The callbacks are used to fix the document tree after\n\t * it has changed. Post-fixers are fired just after all changes from the outermost change block were applied but\n\t * before the {@link module:engine/model/document~Document#event:change change event} is fired. If a post-fixer callback made\n\t * a change, it should return `true`. When this happens, all post-fixers are fired again to check if something else should\n\t * not be fixed in the new document tree state.\n\t *\n\t * As a parameter, a post-fixer callback receives a {@link module:engine/model/writer~Writer writer} instance connected with the\n\t * executed changes block. Thanks to that, all changes done by the callback will be added to the same\n\t * {@link module:engine/model/batch~Batch batch} (and undo step) as the original changes. This makes post-fixer changes transparent\n\t * for the user.\n\t *\n\t * An example of a post-fixer is a callback that checks if all the data were removed from the editor. If so, the\n\t * callback should add an empty paragraph so that the editor is never empty:\n\t *\n\t *\t\tdocument.registerPostFixer( writer => {\n\t *\t\t\tconst changes = document.differ.getChanges();\n\t *\n\t *\t\t\t// Check if the changes lead to an empty root in the editor.\n\t *\t\t\tfor ( const entry of changes ) {\n\t *\t\t\t\tif ( entry.type == 'remove' && entry.position.root.isEmpty ) {\n\t *\t\t\t\t\twriter.insertElement( 'paragraph', entry.position.root, 0 );\n\t *\n\t *\t\t\t\t\t// It is fine to return early, even if multiple roots would need to be fixed.\n\t *\t\t\t\t\t// All post-fixers will be fired again, so if there are more empty roots, those will be fixed, too.\n\t *\t\t\t\t\treturn true;\n\t *\t\t\t\t}\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @param {Function} postFixer\n\t */\n\tregisterPostFixer( postFixer ) {\n\t\tthis._postFixers.add( postFixer );\n\t}\n\n\t/**\n\t * A custom `toJSON()` method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} A clone of this object with the document property changed to a string.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tjson.selection = '[engine.model.DocumentSelection]';\n\t\tjson.model = '[engine.model.Model]';\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Returns the default root for this document which is either the first root that was added to the document using\n\t * {@link #createRoot} or the {@link #graveyard graveyard root} if no other roots were created.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/rootelement~RootElement} The default root for this document.\n\t */\n\t_getDefaultRoot() {\n\t\tfor ( const root of this.roots ) {\n\t\t\tif ( root !== this.graveyard ) {\n\t\t\t\treturn root;\n\t\t\t}\n\t\t}\n\n\t\treturn this.graveyard;\n\t}\n\n\t/**\n\t * Returns the default range for this selection. The default range is a collapsed range that starts and ends\n\t * at the beginning of this selection's document {@link #_getDefaultRoot default root}.\n\t *\n\t * @protected\n\t * @returns {module:engine/model/range~Range}\n\t */\n\t_getDefaultRange() {\n\t\tconst defaultRoot = this._getDefaultRoot();\n\t\tconst schema = this.model.schema;\n\n\t\t// Find the first position where the selection can be put.\n\t\tconst position = new Position( defaultRoot, [ 0 ] );\n\t\tconst nearestRange = schema.getNearestSelectionRange( position );\n\n\t\t// If valid selection range is not found - return range collapsed at the beginning of the root.\n\t\treturn nearestRange || new Range( position );\n\t}\n\n\t/**\n\t * Checks whether a given {@link module:engine/model/range~Range range} is a valid range for\n\t * the {@link #selection document's selection}.\n\t *\n\t * @private\n\t * @param {module:engine/model/range~Range} range A range to check.\n\t * @returns {Boolean} `true` if `range` is valid, `false` otherwise.\n\t */\n\t_validateSelectionRange( range ) {\n\t\treturn validateTextNodePosition( range.start ) && validateTextNodePosition( range.end );\n\t}\n\n\t/**\n\t * Performs post-fixer loops. Executes post-fixer callbacks as long as none of them has done any changes to the model.\n\t *\n\t * @private\n\t */\n\t_callPostFixers( writer ) {\n\t\tlet wasFixed = false;\n\n\t\tdo {\n\t\t\tfor ( const callback of this._postFixers ) {\n\t\t\t\twasFixed = callback( writer );\n\n\t\t\t\tif ( wasFixed ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\t\t} while ( wasFixed );\n\t}\n\n\t/**\n\t * Fired after each {@link module:engine/model/model~Model#enqueueChange `enqueueChange()` block} or the outermost\n\t * {@link module:engine/model/model~Model#change `change()` block} was executed and the document was changed\n\t * during that block's execution.\n\t *\n\t * The changes which this event will cover include:\n\t *\n\t * * document structure changes,\n\t * * selection changes,\n\t * * marker changes.\n\t *\n\t * If you want to be notified about all these changes, then simply listen to this event like this:\n\t *\n\t *\t\tmodel.document.on( 'change', () => {\n\t *\t\t\tconsole.log( 'The document has changed!' );\n\t *\t\t} );\n\t *\n\t * If, however, you only want to be notified about the data changes, then use the\n\t * {@link module:engine/model/document~Document#event:change:data change:data} event,\n\t * which is fired for document structure changes and marker changes (which affects the data).\n\t *\n\t *\t\tmodel.document.on( 'change:data', () => {\n\t *\t\t\tconsole.log( 'The data has changed!' );\n\t *\t\t} );\n\t *\n\t * @event change\n\t * @param {module:engine/model/batch~Batch} batch The batch that was used in the executed changes block.\n\t */\n\n\t/**\n\t * It is a narrower version of the {@link #event:change} event. It is fired for changes which\n\t * affect the editor data. This is:\n\t *\n\t * * document structure changes,\n\t * * marker changes (which affects the data).\n\t *\n\t * If you want to be notified about the data changes, then listen to this event:\n\t *\n\t *\t\tmodel.document.on( 'change:data', () => {\n\t *\t\t\tconsole.log( 'The data has changed!' );\n\t *\t\t} );\n\t *\n\t * If you would like to listen to all document changes, then check out the\n\t * {@link module:engine/model/document~Document#event:change change} event.\n\t *\n\t * @event change:data\n\t * @param {module:engine/model/batch~Batch} batch The batch that was used in the executed changes block.\n\t */\n}\n\nmix( Document, EmitterMixin );\n\n// Checks whether given range boundary position is valid for document selection, meaning that is not between\n// unicode surrogate pairs or base character and combining marks.\nfunction validateTextNodePosition( rangeBoundary ) {\n\tconst textNode = rangeBoundary.textNode;\n\n\tif ( textNode ) {\n\t\tconst data = textNode.data;\n\t\tconst offset = rangeBoundary.offset - textNode.startOffset;\n\n\t\treturn !isInsideSurrogatePair( data, offset ) && !isInsideCombinedSymbol( data, offset );\n\t}\n\n\treturn true;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/markercollection\n */\n\nimport LiveRange from './liverange';\nimport Position from './position';\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The collection of all {@link module:engine/model/markercollection~Marker markers} attached to the document.\n * It lets you {@link module:engine/model/markercollection~MarkerCollection#get get} markers or track them using\n * {@link module:engine/model/markercollection~MarkerCollection#event:update} event.\n *\n * To create, change or remove makers use {@link module:engine/model/writer~Writer model writers'} methods:\n * {@link module:engine/model/writer~Writer#addMarker} or {@link module:engine/model/writer~Writer#removeMarker}. Since\n * the writer is the only proper way to change the data model it is not possible to change markers directly using this\n * collection. All markers created by the writer will be automatically added to this collection.\n *\n * By default there is one marker collection available as {@link module:engine/model/model~Model#markers model property}.\n *\n * @see module:engine/model/markercollection~Marker\n */\nexport default class MarkerCollection {\n\t/**\n\t * Creates a markers collection.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Stores {@link ~Marker markers} added to the collection.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} #_markers\n\t\t */\n\t\tthis._markers = new Map();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link ~Marker markers} added to the collection.\n\t *\n\t * @returns {Iterable}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._markers.values();\n\t}\n\n\t/**\n\t * Checks if marker with given `markerName` is in the collection.\n\t *\n\t * @param {String} markerName Marker name.\n\t * @returns {Boolean} `true` if marker with given `markerName` is in the collection, `false` otherwise.\n\t */\n\thas( markerName ) {\n\t\treturn this._markers.has( markerName );\n\t}\n\n\t/**\n\t * Returns {@link ~Marker marker} with given `markerName`.\n\t *\n\t * @param {String} markerName Name of marker to get.\n\t * @returns {module:engine/model/markercollection~Marker|null} Marker with given name or `null` if such marker was\n\t * not added to the collection.\n\t */\n\tget( markerName ) {\n\t\treturn this._markers.get( markerName ) || null;\n\t}\n\n\t/**\n\t * Creates and adds a {@link ~Marker marker} to the `MarkerCollection` with given name on given\n\t * {@link module:engine/model/range~Range range}.\n\t *\n\t * If `MarkerCollection` already had a marker with given name (or {@link ~Marker marker} was passed), the marker in\n\t * collection is updated and {@link module:engine/model/markercollection~MarkerCollection#event:update} event is fired\n\t * but only if there was a change (marker range or {@link module:engine/model/markercollection~Marker#managedUsingOperations}\n\t * flag has changed.\n\t *\n\t * @protected\n\t * @fires module:engine/model/markercollection~MarkerCollection#event:update\n\t * @param {String|module:engine/model/markercollection~Marker} markerOrName Name of marker to set or marker instance to update.\n\t * @param {module:engine/model/range~Range} range Marker range.\n\t * @param {Boolean} [managedUsingOperations=false] Specifies whether the marker is managed using operations.\n\t * @param {Boolean} [affectsData=false] Specifies whether the marker affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t * @returns {module:engine/model/markercollection~Marker} `Marker` instance which was added or updated.\n\t */\n\t_set( markerOrName, range, managedUsingOperations = false, affectsData = false ) {\n\t\tconst markerName = markerOrName instanceof Marker ? markerOrName.name : markerOrName;\n\t\tconst oldMarker = this._markers.get( markerName );\n\n\t\tif ( oldMarker ) {\n\t\t\tconst oldRange = oldMarker.getRange();\n\t\t\tlet hasChanged = false;\n\n\t\t\tif ( !oldRange.isEqual( range ) ) {\n\t\t\t\toldMarker._attachLiveRange( LiveRange.createFromRange( range ) );\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( managedUsingOperations != oldMarker.managedUsingOperations ) {\n\t\t\t\toldMarker._managedUsingOperations = managedUsingOperations;\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( typeof affectsData === 'boolean' && affectsData != oldMarker.affectsData ) {\n\t\t\t\toldMarker._affectsData = affectsData;\n\t\t\t\thasChanged = true;\n\t\t\t}\n\n\t\t\tif ( hasChanged ) {\n\t\t\t\tthis.fire( 'update:' + markerName, oldMarker, oldRange, range );\n\t\t\t}\n\n\t\t\treturn oldMarker;\n\t\t}\n\n\t\tconst liveRange = LiveRange.createFromRange( range );\n\t\tconst marker = new Marker( markerName, liveRange, managedUsingOperations, affectsData );\n\n\t\tthis._markers.set( markerName, marker );\n\t\tthis.fire( 'update:' + markerName, marker, null, range );\n\n\t\treturn marker;\n\t}\n\n\t/**\n\t * Removes given {@link ~Marker marker} or a marker with given name from the `MarkerCollection`.\n\t *\n\t * @protected\n\t * @fires module:engine/model/markercollection~MarkerCollection#event:update\n\t * @param {String} markerOrName Marker or name of a marker to remove.\n\t * @returns {Boolean} `true` if marker was found and removed, `false` otherwise.\n\t */\n\t_remove( markerOrName ) {\n\t\tconst markerName = markerOrName instanceof Marker ? markerOrName.name : markerOrName;\n\t\tconst oldMarker = this._markers.get( markerName );\n\n\t\tif ( oldMarker ) {\n\t\t\tthis._markers.delete( markerName );\n\t\t\tthis.fire( 'update:' + markerName, oldMarker, oldMarker.getRange(), null );\n\n\t\t\tthis._destroyMarker( oldMarker );\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Returns iterator that iterates over all markers, which ranges contain given {@link module:engine/model/position~Position position}.\n\t *\n\t * @param {module:engine/model/position~Position} position\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersAtPosition( position ) {\n\t\tfor ( const marker of this ) {\n\t\t\tif ( marker.getRange().containsPosition( position ) ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns iterator that iterates over all markers, which intersects with given {@link module:engine/model/range~Range range}.\n\t *\n\t * @param {module:engine/model/range~Range} range\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersIntersectingRange( range ) {\n\t\tfor ( const marker of this ) {\n\t\t\tif ( marker.getRange().getIntersection( range ) !== null ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Destroys marker collection and all markers inside it.\n\t */\n\tdestroy() {\n\t\tfor ( const marker of this._markers.values() ) {\n\t\t\tthis._destroyMarker( marker );\n\t\t}\n\n\t\tthis._markers = null;\n\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Iterates over all markers that starts with given `prefix`.\n\t *\n\t *\t\tconst markerFooA = markersCollection.set( 'foo:a', rangeFooA );\n\t *\t\tconst markerFooB = markersCollection.set( 'foo:b', rangeFooB );\n\t *\t\tconst markerBarA = markersCollection.set( 'bar:a', rangeBarA );\n\t *\t\tconst markerFooBarA = markersCollection.set( 'foobar:a', rangeFooBarA );\n\t *\t\tArray.from( markersCollection.getMarkersGroup( 'foo' ) ); // [ markerFooA, markerFooB ]\n\t *\t\tArray.from( markersCollection.getMarkersGroup( 'a' ) ); // []\n\t *\n\t * @param prefix\n\t * @returns {Iterable.<module:engine/model/markercollection~Marker>}\n\t */\n\t* getMarkersGroup( prefix ) {\n\t\tfor ( const marker of this._markers.values() ) {\n\t\t\tif ( marker.name.startsWith( prefix + ':' ) ) {\n\t\t\t\tyield marker;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Destroys the marker.\n\t *\n\t * @private\n\t * @param {module:engine/model/markercollection~Marker} marker Marker to destroy.\n\t */\n\t_destroyMarker( marker ) {\n\t\tmarker.stopListening();\n\t\tmarker._detachLiveRange();\n\t}\n\n\t/**\n\t * Fired whenever marker is added, updated or removed from `MarkerCollection`.\n\t *\n\t * @event update\n\t * @param {module:engine/model/markercollection~Marker} Updated Marker.\n\t * @param {module:engine/model/range~Range|null} oldRange Marker range before the update. When is not defined it\n\t * means that marker is just added.\n\t * @param {module:engine/model/range~Range|null} newRange Marker range after update. When is not defined it\n\t * means that marker is just removed.\n\t */\n}\n\nmix( MarkerCollection, EmitterMixin );\n\n/**\n * `Marker` is a continuous parts of model (like a range), is named and represent some kind of information about marked\n * part of model document. In contrary to {@link module:engine/model/node~Node nodes}, which are building blocks of\n * model document tree, markers are not stored directly in document tree but in\n * {@link module:engine/model/model~Model#markers model markers' collection}. Still, they are document data, by giving\n * additional meaning to the part of a model document between marker start and marker end.\n *\n * In this sense, markers are similar to adding and converting attributes on nodes. The difference is that attribute is\n * connected with a given node (e.g. a character is bold no matter if it gets moved or content around it changes).\n * Markers on the other hand are continuous ranges and are characterized by their start and end position. This means that\n * any character in the marker is marked by the marker. For example, if a character is moved outside of marker it stops being\n * \"special\" and the marker is shrunk. Similarly, when a character is moved into the marker from other place in document\n * model, it starts being \"special\" and the marker is enlarged.\n *\n * Another upside of markers is that finding marked part of document is fast and easy. Using attributes to mark some nodes\n * and then trying to find that part of document would require traversing whole document tree. Marker gives instant access\n * to the range which it is marking at the moment.\n *\n * Markers are built from a name and a range.\n *\n * Range of the marker is updated automatically when document changes, using\n * {@link module:engine/model/liverange~LiveRange live range} mechanism.\n *\n * Name is used to group and identify markers. Names have to be unique, but markers can be grouped by\n * using common prefixes, separated with `:`, for example: `user:john` or `search:3`. That's useful in term of creating\n * namespaces for custom elements (e.g. comments, highlights). You can use this prefixes in\n * {@link module:engine/model/markercollection~MarkerCollection#event:update} listeners to listen on changes in a group of markers.\n * For instance: `model.markers.on( 'set:user', callback );` will be called whenever any `user:*` markers changes.\n *\n * There are two types of markers.\n *\n * 1. Markers managed directly, without using operations. They are added directly by {@link module:engine/model/writer~Writer}\n * to the {@link module:engine/model/markercollection~MarkerCollection} without any additional mechanism. They can be used\n * as bookmarks or visual markers. They are great for showing results of the find, or select link when the focus is in the input.\n *\n * 1. Markers managed using operations. These markers are also stored in {@link module:engine/model/markercollection~MarkerCollection}\n * but changes in these markers is managed the same way all other changes in the model structure - using operations.\n * Therefore, they are handled in the undo stack and synchronized between clients if the collaboration plugin is enabled.\n * This type of markers is useful for solutions like spell checking or comments.\n *\n * Both type of them should be added / updated by {@link module:engine/model/writer~Writer#addMarker}\n * and removed by {@link module:engine/model/writer~Writer#removeMarker} methods.\n *\n *\t\tmodel.change( ( writer ) => {\n * \t\t\tconst marker = writer.addMarker( name, { range, usingOperation: true } );\n *\n * \t\t\t// ...\n *\n * \t\t\twriter.removeMarker( marker );\n *\t\t} );\n *\n * See {@link module:engine/model/writer~Writer} to find more examples.\n *\n * Since markers need to track change in the document, for efficiency reasons, it is best to create and keep as little\n * markers as possible and remove them as soon as they are not needed anymore.\n *\n * Markers can be downcasted and upcasted.\n *\n * Markers downcast happens on {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:addMarker} and\n * {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:removeMarker} events.\n * Use {@link module:engine/conversion/downcast-converters downcast converters} or attach a custom converter to mentioned events.\n * For {@link module:engine/controller/datacontroller~DataController data pipeline}, marker should be downcasted to an element.\n * Then, it can be upcasted back to a marker. Again, use {@link module:engine/conversion/upcast-converters upcast converters} or\n * attach a custom converter to {@link module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element}.\n *\n * Another upside of markers is that finding marked part of document is fast and easy. Using attributes to mark some nodes\n * and then trying to find that part of document would require traversing whole document tree. Marker gives instant access\n * to the range which it is marking at the moment.\n *\n * `Marker` instances are created and destroyed only by {@link ~MarkerCollection MarkerCollection}.\n */\nclass Marker {\n\t/**\n\t * Creates a marker instance.\n\t *\n\t * @param {String} name Marker name.\n\t * @param {module:engine/model/liverange~LiveRange} liveRange Range marked by the marker.\n\t * @param {Boolean} managedUsingOperations Specifies whether the marker is managed using operations.\n\t * @param {Boolean} affectsData Specifies whether the marker affects the data produced by the data pipeline\n\t * (is persisted in the editor's data).\n\t */\n\tconstructor( name, liveRange, managedUsingOperations, affectsData ) {\n\t\t/**\n\t\t * Marker's name.\n\t\t *\n\t\t * @readonly\n\t\t * @type {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Range marked by the marker.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:engine/model/liverange~LiveRange}\n\t\t */\n\t\tthis._liveRange = this._attachLiveRange( liveRange );\n\n\t\t/**\n\t\t * Flag indicates if the marker is managed using operations or not.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._managedUsingOperations = managedUsingOperations;\n\n\t\t/**\n\t\t * Specifies whether the marker affects the data produced by the data pipeline\n\t\t * (is persisted in the editor's data).\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._affectsData = affectsData;\n\t}\n\n\t/**\n\t * A value indicating if the marker is managed using operations.\n\t * See {@link ~Marker marker class description} to learn more about marker types.\n\t * See {@link module:engine/model/writer~Writer#addMarker}.\n\t *\n\t * @returns {Boolean}\n\t */\n\tget managedUsingOperations() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed: Cannot use a destroyed marker instance.' );\n\t\t}\n\n\t\treturn this._managedUsingOperations;\n\t}\n\n\t/**\n\t * A value indicating if the marker changes the data.\n\t *\n\t * @returns {Boolean}\n\t */\n\tget affectsData() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed: Cannot use a destroyed marker instance.' );\n\t\t}\n\n\t\treturn this._affectsData;\n\t}\n\n\t/**\n\t * Returns current marker start position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetStart() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed: Cannot use a destroyed marker instance.' );\n\t\t}\n\n\t\treturn Position.createFromPosition( this._liveRange.start );\n\t}\n\n\t/**\n\t * Returns current marker end position.\n\t *\n\t * @returns {module:engine/model/position~Position}\n\t */\n\tgetEnd() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed: Cannot use a destroyed marker instance.' );\n\t\t}\n\n\t\treturn Position.createFromPosition( this._liveRange.end );\n\t}\n\n\t/**\n\t * Returns a range that represents the current state of the marker.\n\t *\n\t * Keep in mind that returned value is a {@link module:engine/model/range~Range Range}, not a\n\t * {@link module:engine/model/liverange~LiveRange LiveRange}. This means that it is up-to-date and relevant only\n\t * until next model document change. Do not store values returned by this method. Instead, store {@link ~Marker#name}\n\t * and get `Marker` instance from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection} every\n\t * time there is a need to read marker properties. This will guarantee that the marker has not been removed and\n\t * that it's data is up-to-date.\n\t *\n\t * @returns {module:engine/model/range~Range}\n\t */\n\tgetRange() {\n\t\tif ( !this._liveRange ) {\n\t\t\tthrow new CKEditorError( 'marker-destroyed: Cannot use a destroyed marker instance.' );\n\t\t}\n\n\t\treturn Range.createFromRange( this._liveRange );\n\t}\n\n\t/**\n\t * Binds new live range to the marker and detach the old one if is attached.\n\t *\n\t * @protected\n\t * @param {module:engine/model/liverange~LiveRange} liveRange Live range to attach\n\t * @returns {module:engine/model/liverange~LiveRange} Attached live range.\n\t */\n\t_attachLiveRange( liveRange ) {\n\t\tif ( this._liveRange ) {\n\t\t\tthis._detachLiveRange();\n\t\t}\n\n\t\t// Delegating does not work with namespaces. Alternatively, we could delegate all events (using `*`).\n\t\tliveRange.delegate( 'change:range' ).to( this );\n\t\tliveRange.delegate( 'change:content' ).to( this );\n\n\t\tthis._liveRange = liveRange;\n\n\t\treturn liveRange;\n\t}\n\n\t/**\n\t * Unbinds and destroys currently attached live range.\n\t *\n\t * @protected\n\t */\n\t_detachLiveRange() {\n\t\tthis._liveRange.stopDelegating( 'change:range', this );\n\t\tthis._liveRange.stopDelegating( 'change:content', this );\n\t\tthis._liveRange.detach();\n\t\tthis._liveRange = null;\n\t}\n\n\t/**\n\t * Fired whenever {@link ~Marker#_liveRange marker range} is changed due to changes on {@link module:engine/model/document~Document}.\n\t * This is a delegated {@link module:engine/model/liverange~LiveRange#event:change:range LiveRange change:range event}.\n\t *\n\t * When marker is removed from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection},\n\t * all event listeners listening to it should be removed. It is best to do it on\n\t * {@link module:engine/model/markercollection~MarkerCollection#event:update MarkerCollection update event}.\n\t *\n\t * @see module:engine/model/liverange~LiveRange#event:change:range\n\t * @event change:range\n\t * @param {module:engine/model/range~Range} oldRange\n\t * @param {Object} data\n\t */\n\n\t/**\n\t * Fired whenever change on {@link module:engine/model/document~Document} is done inside {@link ~Marker#_liveRange marker range}.\n\t * This is a delegated {@link module:engine/model/liverange~LiveRange#event:change:content LiveRange change:content event}.\n\t *\n\t * When marker is removed from {@link module:engine/model/markercollection~MarkerCollection MarkerCollection},\n\t * all event listeners listening to it should be removed. It is best to do it on\n\t * {@link module:engine/model/markercollection~MarkerCollection#event:update MarkerCollection update event}.\n\t *\n\t * @see module:engine/model/liverange~LiveRange#event:change:content\n\t * @event change:content\n\t * @param {module:engine/model/range~Range} oldRange\n\t * @param {Object} data\n\t */\n}\n\nmix( Marker, EmitterMixin );\n\n/**\n * Cannot use a {@link module:engine/model/markercollection~MarkerCollection#destroy destroyed marker} instance.\n *\n * @error marker-destroyed\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/liveposition\n */\n\nimport Position from './position';\nimport Range from './range';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * `LivePosition` is a type of {@link module:engine/model/position~Position Position}\n * that updates itself as {@link module:engine/model/document~Document document}\n * is changed through operations. It may be used as a bookmark.\n *\n * **Note:** Contrary to {@link module:engine/model/position~Position}, `LivePosition` works only in roots that are\n * {@link module:engine/model/rootelement~RootElement}.\n * If {@link module:engine/model/documentfragment~DocumentFragment} is passed, error will be thrown.\n *\n * **Note:** Be very careful when dealing with `LivePosition`. Each `LivePosition` instance bind events that might\n * have to be unbound.\n * Use {@link module:engine/model/liveposition~LivePosition#detach} whenever you don't need `LivePosition` anymore.\n *\n * @extends module:engine/model/position~Position\n */\nexport default class LivePosition extends Position {\n\t/**\n\t * Creates a live position.\n\t *\n\t * @see module:engine/model/position~Position\n\t * @param {module:engine/model/rootelement~RootElement} root\n\t * @param {Array.<Number>} path\n\t * @param {module:engine/model/position~PositionStickiness} [stickiness] Defaults to `'sticksToNext'`.\n\t * See {@link module:engine/model/liveposition~LivePosition#stickiness}.\n\t */\n\tconstructor( root, path, stickiness ) {\n\t\tsuper( root, path );\n\n\t\tif ( !this.root.is( 'rootElement' ) ) {\n\t\t\t/**\n\t\t\t * LivePosition's root has to be an instance of RootElement.\n\t\t\t *\n\t\t\t * @error liveposition-root-not-rootelement\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'model-liveposition-root-not-rootelement: LivePosition\\'s root has to be an instance of RootElement.'\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * Flag representing `LivePosition` stickiness. `LivePosition` might be sticking to previous node or next node.\n\t\t * Whenever some nodes are inserted at the same position as `LivePosition`, `stickiness` is checked to decide if\n\t\t * LivePosition should be moved. Similar applies when a range of nodes is moved and one of it's boundary\n\t\t * position is same as `LivePosition`.\n\t\t *\n\t\t * Examples:\n\t\t *\n\t\t *\t\tInsert:\n\t\t *\t\tPosition is at | and we insert at the same position, marked as ^:\n\t\t *\t\t- | sticks to previous node: `<p>f|^oo</p>` => `<p>f|baroo</p>`\n\t\t *\t\t- | sticks to next node: `<p>f^|oo</p>` => `<p>fbar|oo</p>`\n\t\t *\n\t\t *\t\tMove:\n\t\t *\t\tPosition is at | and range [ ] is moved to position ^:\n\t\t *\t\t- | sticks to previous node: `<p>f|[oo]</p><p>b^ar</p>` => `<p>f|</p><p>booar</p>`\n\t\t *\t\t- | sticks to next node: `<p>f|[oo]</p><p>b^ar</p>` => `<p>f</p><p>b|ooar</p>`\n\t\t *\n\t\t * @member {module:engine/model/position~PositionStickiness} module:engine/model/liveposition~LivePosition#stickiness\n\t\t */\n\t\tthis.stickiness = stickiness || 'sticksToNext';\n\n\t\tbindWithDocument.call( this );\n\t}\n\n\t/**\n\t * Unbinds all events previously bound by `LivePosition`. Use it whenever you don't need `LivePosition` instance\n\t * anymore (i.e. when leaving scope in which it was declared or before re-assigning variable that was\n\t * referring to it).\n\t */\n\tdetach() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * @static\n\t * @method module:engine/model/liveposition~LivePosition.createAfter\n\t * @see module:engine/model/position~Position.createAfter\n\t * @param {module:engine/model/node~Node} node\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * @static\n\t * @method module:engine/model/liveposition~LivePosition.createBefore\n\t * @see module:engine/model/position~Position.createBefore\n\t * @param {module:engine/model/node~Node} node\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * @static\n\t * @method module:engine/model/liveposition~LivePosition.createFromParentAndOffset\n\t * @see module:engine/model/position~Position.createFromParentAndOffset\n\t * @param {module:engine/model/element~Element} parent\n\t * @param {Number} offset\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * @static\n\t * @method module:engine/model/liveposition~LivePosition.createFromPosition\n\t * @see module:engine/model/position~Position.createFromPosition\n\t * @param {module:engine/model/position~Position} position\n\t * @returns {module:engine/model/liveposition~LivePosition}\n\t */\n\n\t/**\n\t * Fired when `LivePosition` instance is changed due to changes on {@link module:engine/model/document~Document}.\n\t *\n\t * @event module:engine/model/liveposition~LivePosition#change\n\t * @param {module:engine/model/position~Position} oldPosition Position equal to this live position before it got changed.\n\t */\n}\n\n/**\n * Binds this `LivePosition` to the {@link module:engine/model/document~Document document} that owns\n * this position's {@link module:engine/model/position~Position#root root}.\n *\n * @ignore\n * @private\n * @method module:engine/model/liveposition~LivePosition.bindWithDocument\n */\nfunction bindWithDocument() {\n\t// Operation types handled by LivePosition (these are operations that change model tree structure).\n\tconst supportedTypes = new Set( [ 'insert', 'move', 'remove', 'reinsert' ] );\n\n\tthis.listenTo(\n\t\tthis.root.document.model,\n\t\t'applyOperation',\n\t\t( event, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( supportedTypes.has( operation.type ) ) {\n\t\t\t\ttransform.call( this, operation );\n\t\t\t}\n\t\t},\n\t\t{ priority: 'low' }\n\t);\n}\n\n/**\n * Updates this position accordingly to the updates applied to the model. Bases on change events.\n *\n * @ignore\n * @private\n * @method transform\n * @param {module:engine/model/operation/operation~Operation} operation Executed operation.\n */\nfunction transform( operation ) {\n\t/* eslint-disable no-case-declarations */\n\tlet range;\n\tlet position;\n\n\tif ( operation.type == 'insert' ) {\n\t\trange = Range.createFromPositionAndShift( operation.position, operation.nodes.maxOffset );\n\t} else {\n\t\trange = Range.createFromPositionAndShift( operation.getMovedRangeStart(), operation.howMany );\n\t\tposition = operation.sourcePosition;\n\t}\n\n\tconst howMany = range.end.offset - range.start.offset;\n\tlet transformed;\n\n\tswitch ( operation.type ) {\n\t\tcase 'insert':\n\t\t\tconst insertBefore = this.stickiness == 'sticksToNext';\n\t\t\ttransformed = this._getTransformedByInsertion( range.start, howMany, insertBefore );\n\t\t\tbreak;\n\n\t\tcase 'move':\n\t\tcase 'remove':\n\t\tcase 'reinsert':\n\t\t\tconst originalRange = Range.createFromPositionAndShift( position, howMany );\n\n\t\t\tconst gotMoved = originalRange.containsPosition( this ) ||\n\t\t\t\t( originalRange.start.isEqual( this ) && this.stickiness == 'sticksToNext' ) ||\n\t\t\t\t( originalRange.end.isEqual( this ) && this.stickiness == 'sticksToPrevious' );\n\n\t\t\t// We can't use ._getTransformedByMove() because we have a different if-condition.\n\t\t\tif ( gotMoved ) {\n\t\t\t\ttransformed = this._getCombined( position, range.start );\n\t\t\t} else {\n\t\t\t\tconst insertBefore = this.stickiness == 'sticksToNext';\n\n\t\t\t\t// `Position._getTransformedByMove` is expecting `targetPosition` to be \"before\" move\n\t\t\t\t// (before transformation). `range.start` is already after the move happened.\n\t\t\t\t// We have to revert `targetPosition` to the state before the move.\n\t\t\t\tconst targetPosition = range.start._getTransformedByInsertion( position, howMany );\n\n\t\t\t\ttransformed = this._getTransformedByMove( position, targetPosition, howMany, insertBefore );\n\t\t\t}\n\t\t\tbreak;\n\t}\n\n\tif ( !this.isEqual( transformed ) ) {\n\t\tconst oldPosition = Position.createFromPosition( this );\n\n\t\tthis.path = transformed.path;\n\t\tthis.root = transformed.root;\n\n\t\tthis.fire( 'change', oldPosition );\n\t}\n\t/* eslint-enable no-case-declarations */\n}\n\nmix( LivePosition, EmitterMixin );\n\n/**\n * Enum representing how position is \"sticking\" with their neighbour nodes.\n * Possible values: `'sticksToNext'`, `'sticksToPrevious'`.\n *\n * @typedef {String} module:engine/model/position~PositionStickiness\n */\n\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/utils/insertcontent\n */\n\nimport Position from '../position';\nimport LivePosition from '../liveposition';\nimport Element from '../element';\nimport Range from '../range';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport DocumentSelection from '../documentselection';\n\n/**\n * Inserts content into the editor (specified selection) as one would expect the paste\n * functionality to work.\n *\n * **Note:** Use {@link module:engine/model/model~Model#insertContent} instead of this function.\n * This function is only exposed to be reusable in algorithms\n * which change the {@link module:engine/model/model~Model#insertContent}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which the insertion\n * should be performed.\n * @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * Selection into which the content should be inserted.\n */\nexport default function insertContent( model, content, selection ) {\n\tmodel.change( writer => {\n\t\tif ( !selection.isCollapsed ) {\n\t\t\tmodel.deleteContent( selection );\n\t\t}\n\n\t\tconst insertion = new Insertion( model, writer, selection.anchor );\n\n\t\tlet nodesToInsert;\n\n\t\tif ( content.is( 'documentFragment' ) ) {\n\t\t\tnodesToInsert = content.getChildren();\n\t\t} else {\n\t\t\tnodesToInsert = [ content ];\n\t\t}\n\n\t\tinsertion.handleNodes( nodesToInsert, {\n\t\t\t// The set of children being inserted is the only set in this context\n\t\t\t// so it's the first and last (it's a hack ;)).\n\t\t\tisFirst: true,\n\t\t\tisLast: true\n\t\t} );\n\n\t\tconst newRange = insertion.getSelectionRange();\n\n\t\t/* istanbul ignore else */\n\t\tif ( newRange ) {\n\t\t\tif ( selection instanceof DocumentSelection ) {\n\t\t\t\twriter.setSelection( newRange );\n\t\t\t} else {\n\t\t\t\tselection.setTo( newRange );\n\t\t\t}\n\t\t} else {\n\t\t\t// We are not testing else because it's a safe check for unpredictable edge cases:\n\t\t\t// an insertion without proper range to select.\n\n\t\t\t/**\n\t\t\t * Cannot determine a proper selection range after insertion.\n\t\t\t *\n\t\t\t * @warning insertcontent-no-range\n\t\t\t */\n\t\t\tlog.warn( 'insertcontent-no-range: Cannot determine a proper selection range after insertion.' );\n\t\t}\n\t} );\n}\n\n/**\n * Utility class for performing content insertion.\n *\n * @private\n */\nclass Insertion {\n\tconstructor( model, writer, position ) {\n\t\t/**\n\t\t * The model in context of which the insertion should be performed.\n\t\t *\n\t\t * @member {module:engine/model~Model} #model\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * Batch to which deltas will be added.\n\t\t *\n\t\t * @member {module:engine/controller/writer~Batch} #writer\n\t\t */\n\t\tthis.writer = writer;\n\n\t\t/**\n\t\t * The position at which (or near which) the next node will be inserted.\n\t\t *\n\t\t * @member {module:engine/model/position~Position} #position\n\t\t */\n\t\tthis.position = position;\n\n\t\t/**\n\t\t * Elements with which the inserted elements can be merged.\n\t\t *\n\t\t *\t\t<p>x^</p><p>y</p> + <p>z</p> (can merge to <p>x</p>)\n\t\t *\t\t<p>x</p><p>^y</p> + <p>z</p> (can merge to <p>y</p>)\n\t\t *\t\t<p>x^y</p> + <p>z</p> (can merge to <p>xy</p> which will be split during the action,\n\t\t *\t\t\t\t\t\t\t\tso both its pieces will be added to this set)\n\t\t *\n\t\t *\n\t\t * @member {Set} #canMergeWith\n\t\t */\n\t\tthis.canMergeWith = new Set( [ this.position.parent ] );\n\n\t\t/**\n\t\t * Schema of the model.\n\t\t *\n\t\t * @member {module:engine/model/schema~Schema} #schema\n\t\t */\n\t\tthis.schema = model.schema;\n\n\t\tthis._filterAttributesOf = [];\n\t}\n\n\t/**\n\t * Handles insertion of a set of nodes.\n\t *\n\t * @param {Iterable.<module:engine/model/node~Node>} nodes Nodes to insert.\n\t * @param {Object} parentContext Context in which parent of these nodes was supposed to be inserted.\n\t * If the parent context is passed it means that the parent element was stripped (was not allowed).\n\t */\n\thandleNodes( nodes, parentContext ) {\n\t\tnodes = Array.from( nodes );\n\n\t\tfor ( let i = 0; i < nodes.length; i++ ) {\n\t\t\tconst node = nodes[ i ];\n\n\t\t\tthis._handleNode( node, {\n\t\t\t\tisFirst: i === 0 && parentContext.isFirst,\n\t\t\t\tisLast: ( i === ( nodes.length - 1 ) ) && parentContext.isLast\n\t\t\t} );\n\t\t}\n\n\t\t// TMP this will become a post-fixer.\n\t\tthis.schema.removeDisallowedAttributes( this._filterAttributesOf, this.writer );\n\t\tthis._filterAttributesOf = [];\n\t}\n\n\t/**\n\t * Returns range to be selected after insertion.\n\t * Returns null if there is no valid range to select after insertion.\n\t *\n\t * @returns {module:engine/model/range~Range|null}\n\t */\n\tgetSelectionRange() {\n\t\tif ( this.nodeToSelect ) {\n\t\t\treturn Range.createOn( this.nodeToSelect );\n\t\t}\n\n\t\treturn this.model.schema.getNearestSelectionRange( this.position );\n\t}\n\n\t/**\n\t * Handles insertion of a single node.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node\n\t * @param {Object} context\n\t * @param {Boolean} context.isFirst Whether the given node is the first one in the content to be inserted.\n\t * @param {Boolean} context.isLast Whether the given node is the last one in the content to be inserted.\n\t */\n\t_handleNode( node, context ) {\n\t\t// Let's handle object in a special way.\n\t\t// * They should never be merged with other elements.\n\t\t// * If they are not allowed in any of the selection ancestors, they could be either autoparagraphed or totally removed.\n\t\tif ( this.schema.isObject( node ) ) {\n\t\t\tthis._handleObject( node, context );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Try to find a place for the given node.\n\t\t// Split the position.parent's branch up to a point where the node can be inserted.\n\t\t// If it isn't allowed in the whole branch, then of course don't split anything.\n\t\tconst isAllowed = this._checkAndSplitToAllowedPosition( node, context );\n\n\t\tif ( !isAllowed ) {\n\t\t\tthis._handleDisallowedNode( node, context );\n\n\t\t\treturn;\n\t\t}\n\n\t\tthis._insert( node );\n\n\t\t// After the node was inserted we may try to merge it with its siblings.\n\t\t// This should happen only if it was the first and/or last of the nodes (so only with boundary nodes)\n\t\t// and only if the selection was in those elements initially.\n\t\t//\n\t\t// E.g.:\n\t\t// <p>x^</p> + <p>y</p> => <p>x</p><p>y</p> => <p>xy[]</p>\n\t\t// and:\n\t\t// <p>x^y</p> + <p>z</p> => <p>x</p>^<p>y</p> + <p>z</p> => <p>x</p><p>y</p><p>z</p> => <p>xy[]z</p>\n\t\t// but:\n\t\t// <p>x</p><p>^</p><p>z</p> + <p>y</p> => <p>x</p><p>y</p><p>z</p> (no merging)\n\t\t// <p>x</p>[<img>]<p>z</p> + <p>y</p> => <p>x</p><p>y</p><p>z</p> (no merging, note: after running deletetContents\n\t\t//\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t it's exactly the same case as above)\n\t\tthis._mergeSiblingsOf( node, context );\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/element~Element} node The object element.\n\t * @param {Object} context\n\t */\n\t_handleObject( node, context ) {\n\t\t// Try finding it a place in the tree.\n\t\tif ( this._checkAndSplitToAllowedPosition( node ) ) {\n\t\t\tthis._insert( node );\n\t\t}\n\t\t// Try autoparagraphing.\n\t\telse {\n\t\t\tthis._tryAutoparagraphing( node, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The disallowed node which needs to be handled.\n\t * @param {Object} context\n\t */\n\t_handleDisallowedNode( node, context ) {\n\t\t// If the node is an element, try inserting its children (strip the parent).\n\t\tif ( node.is( 'element' ) ) {\n\t\t\tthis.handleNodes( node.getChildren(), context );\n\t\t}\n\t\t// If text is not allowed, try autoparagraphing it.\n\t\telse {\n\t\t\tthis._tryAutoparagraphing( node, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node to insert.\n\t */\n\t_insert( node ) {\n\t\t/* istanbul ignore if */\n\t\tif ( !this.schema.checkChild( this.position, node ) ) {\n\t\t\t// Algorithm's correctness check. We should never end up here but it's good to know that we did.\n\t\t\t// Note that it would often be a silent issue if we insert node in a place where it's not allowed.\n\t\t\tlog.error(\n\t\t\t\t'insertcontent-wrong-position: The node cannot be inserted on the given position.',\n\t\t\t\t{ node, position: this.position }\n\t\t\t);\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst livePos = LivePosition.createFromPosition( this.position );\n\n\t\tthis.writer.insert( node, this.position );\n\n\t\tthis.position = Position.createFromPosition( livePos );\n\t\tlivePos.detach();\n\n\t\t// The last inserted object should be selected because we can't put a collapsed selection after it.\n\t\tif ( this.schema.isObject( node ) && !this.schema.checkChild( this.position, '$text' ) ) {\n\t\t\tthis.nodeToSelect = node;\n\t\t} else {\n\t\t\tthis.nodeToSelect = null;\n\t\t}\n\n\t\tthis._filterAttributesOf.push( node );\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t */\n\t_mergeSiblingsOf( node, context ) {\n\t\tif ( !( node instanceof Element ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst mergeLeft = this._canMergeLeft( node, context );\n\t\tconst mergeRight = this._canMergeRight( node, context );\n\t\tconst mergePosLeft = LivePosition.createBefore( node );\n\t\tconst mergePosRight = LivePosition.createAfter( node );\n\n\t\tif ( mergeLeft ) {\n\t\t\tconst position = LivePosition.createFromPosition( this.position );\n\n\t\t\tthis.writer.merge( mergePosLeft );\n\n\t\t\tthis.position = Position.createFromPosition( position );\n\t\t\tposition.detach();\n\t\t}\n\n\t\tif ( mergeRight ) {\n\t\t\t/* istanbul ignore if */\n\t\t\tif ( !this.position.isEqual( mergePosRight ) ) {\n\t\t\t\t// Algorithm's correctness check. We should never end up here but it's good to know that we did.\n\t\t\t\t// At this point the insertion position should be after the node we'll merge. If it isn't,\n\t\t\t\t// it should need to be secured as in the left merge case.\n\t\t\t\tlog.error( 'insertcontent-wrong-position-on-merge: The insertion position should equal the merge position' );\n\t\t\t}\n\n\t\t\t// Move the position to the previous node, so it isn't moved to the graveyard on merge.\n\t\t\t// <p>x</p>[]<p>y</p> => <p>x[]</p><p>y</p>\n\t\t\tthis.position = Position.createAt( mergePosRight.nodeBefore, 'end' );\n\n\t\t\t// OK:  <p>xx[]</p> + <p>yy</p> => <p>xx[]yy</p> (when sticks to previous)\n\t\t\t// NOK: <p>xx[]</p> + <p>yy</p> => <p>xxyy[]</p> (when sticks to next)\n\t\t\tconst position = new LivePosition( this.position.root, this.position.path, 'sticksToPrevious' );\n\n\t\t\tthis.writer.merge( mergePosRight );\n\n\t\t\tthis.position = Position.createFromPosition( position );\n\t\t\tposition.detach();\n\t\t}\n\n\t\tif ( mergeLeft || mergeRight ) {\n\t\t\t// After merge elements that were marked by _insert() to be filtered might be gone so\n\t\t\t// we need to mark the new container.\n\t\t\tthis._filterAttributesOf.push( this.position.parent );\n\t\t}\n\n\t\tmergePosLeft.detach();\n\t\tmergePosRight.detach();\n\t}\n\n\t/**\n\t * Checks whether specified node can be merged with previous sibling element.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t * @returns {Boolean}\n\t */\n\t_canMergeLeft( node, context ) {\n\t\tconst previousSibling = node.previousSibling;\n\n\t\treturn context.isFirst &&\n\t\t\t( previousSibling instanceof Element ) &&\n\t\t\tthis.canMergeWith.has( previousSibling ) &&\n\t\t\tthis.model.schema.checkMerge( previousSibling, node );\n\t}\n\n\t/**\n\t * Checks whether specified node can be merged with next sibling element.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which could potentially be merged.\n\t * @param {Object} context\n\t * @returns {Boolean}\n\t */\n\t_canMergeRight( node, context ) {\n\t\tconst nextSibling = node.nextSibling;\n\n\t\treturn context.isLast &&\n\t\t\t( nextSibling instanceof Element ) &&\n\t\t\tthis.canMergeWith.has( nextSibling ) &&\n\t\t\tthis.model.schema.checkMerge( node, nextSibling );\n\t}\n\n\t/**\n\t * Tries wrapping the node in a new paragraph and inserting it this way.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node which needs to be autoparagraphed.\n\t * @param {Object} context\n\t */\n\t_tryAutoparagraphing( node, context ) {\n\t\tconst paragraph = this.writer.createElement( 'paragraph' );\n\n\t\t// Do not autoparagraph if the paragraph won't be allowed there,\n\t\t// cause that would lead to an infinite loop. The paragraph would be rejected in\n\t\t// the next _handleNode() call and we'd be here again.\n\t\tif ( this._getAllowedIn( paragraph, this.position.parent ) && this.schema.checkChild( paragraph, node ) ) {\n\t\t\tparagraph._appendChild( node );\n\t\t\tthis._handleNode( paragraph, context );\n\t\t}\n\t}\n\n\t/**\n\t * @private\n\t * @param {module:engine/model/node~Node} node\n\t * @returns {Boolean} Whether an allowed position was found.\n\t * `false` is returned if the node isn't allowed at any position up in the tree, `true` if was.\n\t */\n\t_checkAndSplitToAllowedPosition( node ) {\n\t\tconst allowedIn = this._getAllowedIn( node, this.position.parent );\n\n\t\tif ( !allowedIn ) {\n\t\t\treturn false;\n\t\t}\n\n\t\twhile ( allowedIn != this.position.parent ) {\n\t\t\t// If a parent which we'd need to leave is a limit element, break.\n\t\t\tif ( this.schema.isLimit( this.position.parent ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\n\t\t\tif ( this.position.isAtStart ) {\n\t\t\t\tconst parent = this.position.parent;\n\t\t\t\tthis.position = Position.createBefore( parent );\n\n\t\t\t\t// Special case – parent is empty (<p>^</p>) so isAtStart == isAtEnd == true.\n\t\t\t\t// We can remove the element after moving selection out of it.\n\t\t\t\tif ( parent.isEmpty ) {\n\t\t\t\t\tthis.writer.remove( parent );\n\t\t\t\t}\n\t\t\t} else if ( this.position.isAtEnd ) {\n\t\t\t\tthis.position = Position.createAfter( this.position.parent );\n\t\t\t} else {\n\t\t\t\tconst tempPos = Position.createAfter( this.position.parent );\n\n\t\t\t\tthis.writer.split( this.position );\n\n\t\t\t\tthis.position = tempPos;\n\n\t\t\t\tthis.canMergeWith.add( this.position.nodeAfter );\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Gets the element in which the given node is allowed. It checks the passed element and all its ancestors.\n\t *\n\t * @private\n\t * @param {module:engine/model/node~Node} node The node to check.\n\t * @param {module:engine/model/element~Element} element The element in which the node's correctness should be checked.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\t_getAllowedIn( node, element ) {\n\t\tif ( this.schema.checkChild( element, node ) ) {\n\t\t\treturn element;\n\t\t}\n\n\t\tif ( element.parent ) {\n\t\t\treturn this._getAllowedIn( node, element.parent );\n\t\t}\n\n\t\treturn null;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/utils/deletecontent\n */\n\nimport LivePosition from '../liveposition';\nimport Position from '../position';\nimport Range from '../range';\nimport DocumentSelection from '../documentselection';\n\n/**\n * Deletes content of the selection and merge siblings. The resulting selection is always collapsed.\n *\n * **Note:** Use {@link module:engine/model/model~Model#deleteContent} instead of this function.\n * This function is only exposed to be reusable in algorithms\n * which change the {@link module:engine/model/model~Model#deleteContent}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which the insertion\n * should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * Selection of which the content should be deleted.\n * @param {module:engine/model/batch~Batch} batch Batch to which the deltas will be added.\n * @param {Object} [options]\n * @param {Boolean} [options.leaveUnmerged=false] Whether to merge elements after removing the content of the selection.\n *\n * For example `<heading>x[x</heading><paragraph>y]y</paragraph>` will become:\n *\n * * `<heading>x^y</heading>` with the option disabled (`leaveUnmerged == false`)\n * * `<heading>x^</heading><paragraph>y</paragraph>` with enabled (`leaveUnmerged == true`).\n *\n * Note: {@link module:engine/model/schema~Schema#isObject object} and {@link module:engine/model/schema~Schema#isLimit limit}\n * elements will not be merged.\n *\n * @param {Boolean} [options.doNotResetEntireContent=false] Whether to skip replacing the entire content with a\n * paragraph when the entire content was selected.\n *\n * For example `<heading>[x</heading><paragraph>y]</paragraph>` will become:\n *\n * * `<paragraph>^</paragraph>` with the option disabled (`doNotResetEntireContent == false`)\n * * `<heading>^</heading>` with enabled (`doNotResetEntireContent == true`).\n */\nexport default function deleteContent( model, selection, options = {} ) {\n\tif ( selection.isCollapsed ) {\n\t\treturn;\n\t}\n\n\tconst schema = model.schema;\n\n\tmodel.change( writer => {\n\t\t// 1. Replace the entire content with paragraph.\n\t\t// See: https://github.com/ckeditor/ckeditor5-engine/issues/1012#issuecomment-315017594.\n\t\tif ( !options.doNotResetEntireContent && shouldEntireContentBeReplacedWithParagraph( schema, selection ) ) {\n\t\t\treplaceEntireContentWithParagraph( writer, selection, schema );\n\n\t\t\treturn;\n\t\t}\n\n\t\tconst selRange = selection.getFirstRange();\n\t\tconst startPos = selRange.start;\n\t\tconst endPos = LivePosition.createFromPosition( selRange.end );\n\n\t\t// 2. Remove the content if there is any.\n\t\tif ( !selRange.start.isTouching( selRange.end ) ) {\n\t\t\twriter.remove( selRange );\n\t\t}\n\n\t\t// 3. Merge elements in the right branch to the elements in the left branch.\n\t\t// The only reasonable (in terms of data and selection correctness) case in which we need to do that is:\n\t\t//\n\t\t// <heading type=1>Fo[</heading><paragraph>]ar</paragraph> => <heading type=1>Fo^ar</heading>\n\t\t//\n\t\t// However, the algorithm supports also merging deeper structures (up to the depth of the shallower branch),\n\t\t// as it's hard to imagine what should actually be the default behavior. Usually, specific features will\n\t\t// want to override that behavior anyway.\n\t\tif ( !options.leaveUnmerged ) {\n\t\t\tmergeBranches( writer, startPos, endPos );\n\n\t\t\t// TMP this will be replaced with a postifxer.\n\t\t\t// We need to check and strip disallowed attributes in all nested nodes because after merge\n\t\t\t// some attributes could end up in a path where are disallowed.\n\t\t\t//\n\t\t\t// e.g. bold is disallowed for <H1>\n\t\t\t// <h1>Fo{o</h1><p>b}a<b>r</b><p> -> <h1>Fo{}a<b>r</b><h1> -> <h1>Fo{}ar<h1>.\n\t\t\tschema.removeDisallowedAttributes( startPos.parent.getChildren(), writer );\n\t\t}\n\n\t\tif ( selection instanceof DocumentSelection ) {\n\t\t\twriter.setSelection( startPos );\n\t\t} else {\n\t\t\tselection.setTo( startPos );\n\t\t}\n\n\t\t// 4. Autoparagraphing.\n\t\t// Check if a text is allowed in the new container. If not, try to create a new paragraph (if it's allowed here).\n\t\tif ( shouldAutoparagraph( schema, startPos ) ) {\n\t\t\tinsertParagraph( writer, startPos, selection );\n\t\t}\n\n\t\tendPos.detach();\n\t} );\n}\n\n// This function is a result of reaching the Ballmer's peak for just the right amount of time.\n// Even I had troubles documenting it after a while and after reading it again I couldn't believe that it really works.\nfunction mergeBranches( writer, startPos, endPos ) {\n\tconst startParent = startPos.parent;\n\tconst endParent = endPos.parent;\n\n\t// If both positions ended up in the same parent, then there's nothing more to merge:\n\t// <$root><p>x[]</p><p>{}y</p></$root> => <$root><p>xy</p>[]{}</$root>\n\tif ( startParent == endParent ) {\n\t\treturn;\n\t}\n\n\t// If one of the positions is a root, then there's nothing more to merge (at least in the current state of implementation).\n\t// Theoretically in this case we could unwrap the <p>: <$root>x[]<p>{}y</p></$root>, but we don't need to support it yet\n\t// so let's just abort.\n\tif ( !startParent.parent || !endParent.parent ) {\n\t\treturn;\n\t}\n\n\t// Check if operations we'll need to do won't need to cross object or limit boundaries.\n\t// E.g., we can't merge endParent into startParent in this case:\n\t// <limit><startParent>x[]</startParent></limit><endParent>{}</endParent>\n\tif ( !checkCanBeMerged( startPos, endPos, writer.model.schema ) ) {\n\t\treturn;\n\t}\n\n\t// Remember next positions to merge. For example:\n\t// <a><b>x[]</b></a><c><d>{}y</d></c>\n\t// will become:\n\t// <a><b>xy</b>[]</a><c>{}</c>\n\tstartPos = Position.createAfter( startParent );\n\tendPos = Position.createBefore( endParent );\n\n\tif ( !endPos.isEqual( startPos ) ) {\n\t\t// In this case, before we merge, we need to move `endParent` to the `startPos`:\n\t\t// <a><b>x[]</b></a><c><d>{}y</d></c>\n\t\t// becomes:\n\t\t// <a><b>x</b>[]<d>y</d></a><c>{}</c>\n\t\twriter.insert( endParent, startPos );\n\t}\n\n\t// Merge two siblings:\n\t// <a>x</a>[]<b>y</b> -> <a>xy</a> (the usual case)\n\t// <a><b>x</b>[]<d>y</d></a><c></c> -> <a><b>xy</b>[]</a><c></c> (this is the \"move parent\" case shown above)\n\twriter.merge( startPos );\n\n\t// Remove empty end ancestors:\n\t// <a>fo[o</a><b><a><c>bar]</c></a></b>\n\t// becomes:\n\t// <a>fo[]</a><b><a>{}</a></b>\n\t// So we can remove <a> and <b>.\n\twhile ( endPos.parent.isEmpty ) {\n\t\tconst parentToRemove = endPos.parent;\n\n\t\tendPos = Position.createBefore( parentToRemove );\n\n\t\twriter.remove( parentToRemove );\n\t}\n\n\t// Continue merging next level.\n\tmergeBranches( writer, startPos, endPos );\n}\n\nfunction shouldAutoparagraph( schema, position ) {\n\tconst isTextAllowed = schema.checkChild( position, '$text' );\n\tconst isParagraphAllowed = schema.checkChild( position, 'paragraph' );\n\n\treturn !isTextAllowed && isParagraphAllowed;\n}\n\n// Check if parents of two positions can be merged by checking if there are no limit/object\n// boundaries between those two positions.\n//\n// E.g. in <bQ><p>x[]</p></bQ><widget><caption>{}</caption></widget>\n// we'll check <p>, <bQ>, <widget> and <caption>.\n// Usually, widget and caption are marked as objects/limits in the schema, so in this case merging will be blocked.\nfunction checkCanBeMerged( leftPos, rightPos, schema ) {\n\tconst rangeToCheck = new Range( leftPos, rightPos );\n\n\tfor ( const value of rangeToCheck.getWalker() ) {\n\t\tif ( schema.isLimit( value.item ) ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn true;\n}\n\nfunction insertParagraph( writer, position, selection ) {\n\tconst paragraph = writer.createElement( 'paragraph' );\n\n\twriter.insert( paragraph, position );\n\n\tif ( selection instanceof DocumentSelection ) {\n\t\twriter.setSelection( paragraph, 0 );\n\t} else {\n\t\tselection.setTo( paragraph, 0 );\n\t}\n}\n\nfunction replaceEntireContentWithParagraph( writer, selection ) {\n\tconst limitElement = writer.model.schema.getLimitElement( selection );\n\n\twriter.remove( Range.createIn( limitElement ) );\n\tinsertParagraph( writer, Position.createAt( limitElement ), selection );\n}\n\n// We want to replace the entire content with a paragraph when:\n// * the entire content is selected,\n// * selection contains at least two elements,\n// * whether the paragraph is allowed in schema in the common ancestor.\nfunction shouldEntireContentBeReplacedWithParagraph( schema, selection ) {\n\tconst limitElement = schema.getLimitElement( selection );\n\n\tif ( !selection.containsEntireContent( limitElement ) ) {\n\t\treturn false;\n\t}\n\n\tconst range = selection.getFirstRange();\n\n\tif ( range.start.parent == range.end.parent ) {\n\t\treturn false;\n\t}\n\n\treturn schema.checkChild( limitElement, 'paragraph' );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/utils/modifyselection\n */\n\nimport Position from '../position';\nimport TreeWalker from '../treewalker';\nimport Range from '../range';\nimport { isInsideSurrogatePair, isInsideCombinedSymbol } from '@ckeditor/ckeditor5-utils/src/unicode';\nimport DocumentSelection from '../documentselection';\n\nconst wordBoundaryCharacters = ' ,.?!:;\"-()';\n\n/**\n * Modifies the selection. Currently, the supported modifications are:\n *\n * * Extending. The selection focus is moved in the specified `options.direction` with a step specified in `options.unit`.\n * Possible values for `unit` are:\n *  * `'character'` (default) - moves selection by one user-perceived character. In most cases this means moving by one\n *  character in `String` sense. However, unicode also defines \"combing marks\". These are special symbols, that combines\n *  with a symbol before it (\"base character\") to create one user-perceived character. For example, `q̣̇` is a normal\n *  letter `q` with two \"combining marks\": upper dot (`Ux0307`) and lower dot (`Ux0323`). For most actions, i.e. extending\n *  selection by one position, it is correct to include both \"base character\" and all of it's \"combining marks\". That is\n *  why `'character'` value is most natural and common method of modifying selection.\n *  * `'codePoint'` - moves selection by one unicode code point. In contrary to, `'character'` unit, this will insert\n *  selection between \"base character\" and \"combining mark\", because \"combining marks\" have their own unicode code points.\n *  However, for technical reasons, unicode code points with values above `UxFFFF` are represented in native `String` by\n *  two characters, called \"surrogate pairs\". Halves of \"surrogate pairs\" have a meaning only when placed next to each other.\n *  For example `𨭎` is represented in `String` by `\\uD862\\uDF4E`. Both `\\uD862` and `\\uDF4E` do not have any meaning\n *  outside the pair (are rendered as ? when alone). Position between them would be incorrect. In this case, selection\n *  extension will include whole \"surrogate pair\".\n *  * `'word'` - moves selection by a whole word.\n *\n * **Note:** if you extend a forward selection in a backward direction you will in fact shrink it.\n *\n * **Note:** Use {@link module:engine/model/model~Model#modifySelection} instead of this function.\n * This function is only exposed to be reusable in algorithms\n * which change the {@link module:engine/model/model~Model#modifySelection}\n * method's behavior.\n *\n * @param {module:engine/model/model~Model} model The model in context of which\n * the selection modification should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * The selection to modify.\n * @param {Object} [options]\n * @param {'forward'|'backward'} [options.direction='forward'] The direction in which the selection should be modified.\n * @param {'character'|'codePoint'|'word'} [options.unit='character'] The unit by which selection should be modified.\n */\nexport default function modifySelection( model, selection, options = {} ) {\n\tconst schema = model.schema;\n\tconst isForward = options.direction != 'backward';\n\tconst unit = options.unit ? options.unit : 'character';\n\n\tconst focus = selection.focus;\n\n\tconst walker = new TreeWalker( {\n\t\tboundaries: getSearchRange( focus, isForward ),\n\t\tsingleCharacters: true,\n\t\tdirection: isForward ? 'forward' : 'backward'\n\t} );\n\n\tconst data = { walker, schema, isForward, unit };\n\n\tlet next;\n\n\twhile ( ( next = walker.next() ) ) {\n\t\tif ( next.done ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst position = tryExtendingTo( data, next.value );\n\n\t\tif ( position ) {\n\t\t\tif ( selection instanceof DocumentSelection ) {\n\t\t\t\tmodel.change( writer => {\n\t\t\t\t\twriter.setSelectionFocus( position );\n\t\t\t\t} );\n\t\t\t} else {\n\t\t\t\tselection.setFocus( position );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\t}\n}\n\n// Checks whether the selection can be extended to the the walker's next value (next position).\n// @param {{ walker, unit, isForward, schema }} data\n// @param {module:engine/view/treewalker~TreeWalkerValue} value\nfunction tryExtendingTo( data, value ) {\n\t// If found text, we can certainly put the focus in it. Let's just find a correct position\n\t// based on the unit.\n\tif ( value.type == 'text' ) {\n\t\tif ( data.unit === 'word' ) {\n\t\t\treturn getCorrectWordBreakPosition( data.walker, data.isForward );\n\t\t}\n\n\t\treturn getCorrectPosition( data.walker, data.unit, data.isForward );\n\t}\n\n\t// Entering an element.\n\tif ( value.type == ( data.isForward ? 'elementStart' : 'elementEnd' ) ) {\n\t\t// If it's an object, we can select it now.\n\t\tif ( data.schema.isObject( value.item ) ) {\n\t\t\treturn Position.createAt( value.item, data.isForward ? 'after' : 'before' );\n\t\t}\n\n\t\t// If text allowed on this position, extend to this place.\n\t\tif ( data.schema.checkChild( value.nextPosition, '$text' ) ) {\n\t\t\treturn value.nextPosition;\n\t\t}\n\t}\n\t// Leaving an element.\n\telse {\n\t\t// If leaving a limit element, stop.\n\t\tif ( data.schema.isLimit( value.item ) ) {\n\t\t\t// NOTE: Fast-forward the walker until the end.\n\t\t\tdata.walker.skip( () => true );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// If text allowed on this position, extend to this place.\n\t\tif ( data.schema.checkChild( value.nextPosition, '$text' ) ) {\n\t\t\treturn value.nextPosition;\n\t\t}\n\t}\n}\n\n// Finds a correct position by walking in a text node and checking whether selection can be extended to given position\n// or should be extended further.\n//\n// @param {module:engine/model/treewalker~TreeWalker} walker\n// @param {String} unit The unit by which selection should be modified.\nfunction getCorrectPosition( walker, unit ) {\n\tconst textNode = walker.position.textNode;\n\n\tif ( textNode ) {\n\t\tconst data = textNode.data;\n\t\tlet offset = walker.position.offset - textNode.startOffset;\n\n\t\twhile ( isInsideSurrogatePair( data, offset ) || ( unit == 'character' && isInsideCombinedSymbol( data, offset ) ) ) {\n\t\t\twalker.next();\n\n\t\t\toffset = walker.position.offset - textNode.startOffset;\n\t\t}\n\t}\n\n\treturn walker.position;\n}\n\n// Finds a correct position of a word break by walking in a text node and checking whether selection can be extended to given position\n// or should be extended further.\n//\n// @param {module:engine/model/treewalker~TreeWalker} walker\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction getCorrectWordBreakPosition( walker, isForward ) {\n\tlet textNode = walker.position.textNode;\n\n\tif ( textNode ) {\n\t\tlet offset = walker.position.offset - textNode.startOffset;\n\n\t\twhile ( !isAtWordBoundary( textNode.data, offset, isForward ) && !isAtNodeBoundary( textNode, offset, isForward ) ) {\n\t\t\twalker.next();\n\n\t\t\t// Check of adjacent text nodes with different attributes (like BOLD).\n\t\t\t// Example          : 'foofoo []bar<$text bold=\"true\">bar</$text> bazbaz'\n\t\t\t// should expand to : 'foofoo [bar<$text bold=\"true\">bar</$text>] bazbaz'.\n\t\t\tconst nextNode = isForward ? walker.position.nodeAfter : walker.position.nodeBefore;\n\n\t\t\t// Scan only text nodes. Ignore inline elements (like `<softBreak>`).\n\t\t\tif ( nextNode && nextNode.is( 'text' ) ) {\n\t\t\t\t// Check boundary char of an adjacent text node.\n\t\t\t\tconst boundaryChar = nextNode.data.charAt( isForward ? 0 : nextNode.data.length - 1 );\n\n\t\t\t\t// Go to the next node if the character at the boundary of that node belongs to the same word.\n\t\t\t\tif ( !wordBoundaryCharacters.includes( boundaryChar ) ) {\n\t\t\t\t\t// If adjacent text node belongs to the same word go to it & reset values.\n\t\t\t\t\twalker.next();\n\n\t\t\t\t\ttextNode = walker.position.textNode;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\toffset = walker.position.offset - textNode.startOffset;\n\t\t}\n\t}\n\n\treturn walker.position;\n}\n\nfunction getSearchRange( start, isForward ) {\n\tconst root = start.root;\n\tconst searchEnd = Position.createAt( root, isForward ? 'end' : 0 );\n\n\tif ( isForward ) {\n\t\treturn new Range( start, searchEnd );\n\t} else {\n\t\treturn new Range( searchEnd, start );\n\t}\n}\n\n// Checks if selection is on word boundary.\n//\n// @param {String} data The text node value to investigate.\n// @param {Number} offset Position offset.\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction isAtWordBoundary( data, offset, isForward ) {\n\t// The offset to check depends on direction.\n\tconst offsetToCheck = offset + ( isForward ? 0 : -1 );\n\n\treturn wordBoundaryCharacters.includes( data.charAt( offsetToCheck ) );\n}\n\n// Checks if selection is on node boundary.\n//\n// @param {module:engine/model/text~Text} textNode The text node to investigate.\n// @param {Number} offset Position offset.\n// @param {Boolean} isForward Is the direction in which the selection should be modified is forward.\nfunction isAtNodeBoundary( textNode, offset, isForward ) {\n\treturn offset === ( isForward ? textNode.endOffset : 0 );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/utils/getselectedcontent\n */\n\nimport Range from '../range';\nimport Position from '../position';\n\n/**\n * Gets a clone of the selected content.\n *\n * For example, for the following selection:\n *\n * ```html\n * <p>x</p><quote><p>y</p><h>fir[st</h></quote><p>se]cond</p><p>z</p>\n * ```\n *\n * It will return a document fragment with such a content:\n *\n * ```html\n * <quote><h>st</h></quote><p>se</p>\n * ```\n *\n * @param {module:engine/model/model~Model} model The model in context of which\n * the selection modification should be performed.\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * The selection of which content will be returned.\n * @returns {module:engine/model/documentfragment~DocumentFragment}\n */\nexport default function getSelectedContent( model, selection ) {\n\treturn model.change( writer => {\n\t\tconst frag = writer.createDocumentFragment();\n\t\tconst range = selection.getFirstRange();\n\n\t\tif ( !range || range.isCollapsed ) {\n\t\t\treturn frag;\n\t\t}\n\n\t\tconst root = range.start.root;\n\t\tconst commonPath = range.start.getCommonPath( range.end );\n\t\tconst commonParent = root.getNodeByPath( commonPath );\n\n\t\t// ## 1st step\n\t\t//\n\t\t// First, we'll clone a fragment represented by a minimal flat range\n\t\t// containing the original range to be cloned.\n\t\t// E.g. let's consider such a range:\n\t\t//\n\t\t// <p>x</p><quote><p>y</p><h>fir[st</h></quote><p>se]cond</p><p>z</p>\n\t\t//\n\t\t// A minimal flat range containing this one is:\n\t\t//\n\t\t// <p>x</p>[<quote><p>y</p><h>first</h></quote><p>second</p>]<p>z</p>\n\t\t//\n\t\t// We can easily clone this structure, preserving e.g. the <quote> element.\n\t\tlet flatSubtreeRange;\n\n\t\tif ( range.start.parent == range.end.parent ) {\n\t\t\t// The original range is flat, so take it.\n\t\t\tflatSubtreeRange = range;\n\t\t} else {\n\t\t\tflatSubtreeRange = Range.createFromParentsAndOffsets(\n\t\t\t\tcommonParent, range.start.path[ commonPath.length ],\n\t\t\t\tcommonParent, range.end.path[ commonPath.length ] + 1\n\t\t\t);\n\t\t}\n\n\t\tconst howMany = flatSubtreeRange.end.offset - flatSubtreeRange.start.offset;\n\n\t\t// Clone the whole contents.\n\t\tfor ( const item of flatSubtreeRange.getItems( { shallow: true } ) ) {\n\t\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\t\twriter.appendText( item.data, item.getAttributes(), frag );\n\t\t\t} else {\n\t\t\t\twriter.append( item._clone( true ), frag );\n\t\t\t}\n\t\t}\n\n\t\t// ## 2nd step\n\t\t//\n\t\t// If the original range wasn't flat, then we need to remove the excess nodes from the both ends of the cloned fragment.\n\t\t//\n\t\t// For example, for the range shown in the 1st step comment, we need to remove these pieces:\n\t\t//\n\t\t// <quote>[<p>y</p>]<h>[fir]st</h></quote><p>se[cond]</p>\n\t\t//\n\t\t// So this will be the final copied content:\n\t\t//\n\t\t// <quote><h>st</h></quote><p>se</p>\n\t\t//\n\t\t// In order to do that, we remove content from these two ranges:\n\t\t//\n\t\t// [<quote><p>y</p><h>fir]st</h></quote><p>se[cond</p>]\n\t\tif ( flatSubtreeRange != range ) {\n\t\t\t// Find the position of the original range in the cloned fragment.\n\t\t\tconst newRange = range._getTransformedByMove( flatSubtreeRange.start, Position.createAt( frag, 0 ), howMany )[ 0 ];\n\n\t\t\tconst leftExcessRange = new Range( Position.createAt( frag ), newRange.start );\n\t\t\tconst rightExcessRange = new Range( newRange.end, Position.createAt( frag, 'end' ) );\n\n\t\t\tremoveRangeContent( rightExcessRange, writer );\n\t\t\tremoveRangeContent( leftExcessRange, writer );\n\t\t}\n\n\t\treturn frag;\n\t} );\n}\n\n// After https://github.com/ckeditor/ckeditor5-engine/issues/690 is fixed,\n// this function will, most likely, be able to rewritten using getMinimalFlatRanges().\nfunction removeRangeContent( range, writer ) {\n\tconst parentsToCheck = [];\n\n\tArray.from( range.getItems( { direction: 'backward' } ) )\n\t\t// We should better store ranges because text proxies will lose integrity\n\t\t// with the text nodes when we'll start removing content.\n\t\t.map( item => Range.createOn( item ) )\n\t\t// Filter only these items which are fully contained in the passed range.\n\t\t//\n\t\t// E.g. for the following range: [<quote><p>y</p><h>fir]st</h>\n\t\t// the walker will return the entire <h> element, when only the \"fir\" item inside it is fully contained.\n\t\t.filter( itemRange => {\n\t\t\t// We should be able to use Range.containsRange, but https://github.com/ckeditor/ckeditor5-engine/issues/691.\n\t\t\tconst contained =\n\t\t\t\t( itemRange.start.isAfter( range.start ) || itemRange.start.isEqual( range.start ) ) &&\n\t\t\t\t( itemRange.end.isBefore( range.end ) || itemRange.end.isEqual( range.end ) );\n\n\t\t\treturn contained;\n\t\t} )\n\t\t.forEach( itemRange => {\n\t\t\tparentsToCheck.push( itemRange.start.parent );\n\n\t\t\twriter.remove( itemRange );\n\t\t} );\n\n\t// Remove ancestors of the removed items if they turned to be empty now\n\t// (their whole content was contained in the range).\n\tparentsToCheck.forEach( parentToCheck => {\n\t\tlet parent = parentToCheck;\n\n\t\twhile ( parent.parent && parent.isEmpty ) {\n\t\t\tconst removeRange = Range.createOn( parent );\n\n\t\t\tparent = parent.parent;\n\n\t\t\twriter.remove( removeRange );\n\t\t}\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/utils/selection-post-fixer\n */\n\nimport Range from '../range';\nimport Position from '../position';\n\n/**\n * Injects selection post-fixer to the model.\n *\n * The role of the selection post-fixer is to ensure that the selection is in a correct place\n * after a {@link module:engine/model/model~Model#change `change()`} block was executed.\n *\n * The correct position means that:\n *\n * * All collapsed selection ranges are in a place where the {@link module:engine/model/schema~Schema}\n * allows a `$text`.\n * * None of the selection's non-collapsed ranges crosses a {@link module:engine/model/schema~Schema#isLimit limit element}\n * boundary (a range must be rooted within one limit element).\n * * Only {@link module:engine/model/schema~Schema#isObject object elements} can be selected from the outside\n * (e.g. `[<paragraph>foo</paragraph>]` is invalid). This rule applies independently to both selection ends, so this\n * selection is correct: `<paragraph>f[oo</paragraph><image></image>]`.\n *\n * If the position is not correct, the post-fixer will automatically correct it.\n *\n * ## Fixing a non-collapsed selection\n *\n * See as an example a selection that starts in a P1 element and ends inside the text of a TD element\n * (`[` and `]` are range boundaries and `(l)` denotes an element defined as `isLimit=true`):\n *\n *\t\troot\n *\t\t |- element P1\n *\t\t |   |- \"foo\"                                      root\n *\t\t |- element TABLE (l)                   P1         TABLE             P2\n *\t\t |   |- element TR (l)                 f o[o     TR      TR         b a r\n *\t\t |   |   |- element TD (l)                       TD      TD\n *\t\t |   |       |- \"aaa\"                          a]a a    b b b\n *\t\t |   |- element TR (l)\n *\t\t |   |   |- element TD (l)                           ||\n *\t\t |   |       |- \"bbb\"                                ||\n *\t\t |- element P2                                       VV\n *\t\t |   |- \"bar\"\n *\t\t                                                   root\n *\t\t                                        P1         TABLE]            P2\n *\t\t                                       f o[o     TR      TR         b a r\n *\t\t                                                 TD      TD\n *\t\t                                               a a a    b b b\n *\n * In the example above, the TABLE, TR and TD are defined as `isLimit=true` in the schema. The range which is not contained within\n * a single limit element must be expanded to select the outermost limit element. The range end is inside the text node of the TD element.\n * As the TD element is a child of the TR and TABLE elements, where both are defined as `isLimit=true` in the schema, the range must be\n * expanded to select the whole TABLE element.\n *\n * **Note** If the selection contains multiple ranges, the method returns a minimal set of ranges that are not intersecting after expanding\n * them to select `isLimit=true` elements.\n *\n * @param {module:engine/model/model~Model} model\n */\nexport function injectSelectionPostFixer( model ) {\n\tmodel.document.registerPostFixer( writer => selectionPostFixer( writer, model ) );\n}\n\n// The selection post-fixer.\n//\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/model~Model} model\nfunction selectionPostFixer( writer, model ) {\n\tconst selection = model.document.selection;\n\tconst schema = model.schema;\n\n\tconst ranges = [];\n\n\tlet wasFixed = false;\n\n\tfor ( const modelRange of selection.getRanges() ) {\n\t\t// Go through all ranges in selection and try fixing each of them.\n\t\t// Those ranges might overlap but will be corrected later.\n\t\tconst correctedRange = tryFixingRange( modelRange, schema );\n\n\t\tif ( correctedRange ) {\n\t\t\tranges.push( correctedRange );\n\t\t\twasFixed = true;\n\t\t} else {\n\t\t\tranges.push( modelRange );\n\t\t}\n\t}\n\n\t// If any of ranges were corrected update the selection.\n\tif ( wasFixed ) {\n\t\t// The above algorithm might create ranges that intersects each other when selection contains more then one range.\n\t\t// This is case happens mostly on Firefox which creates multiple ranges for selected table.\n\t\tlet fixedRanges = ranges;\n\n\t\t// Fixing selection with many ranges usually breaks the selection in Firefox. As only Firefox supports multiple selection ranges\n\t\t// we simply create one continuous range from fixed selection ranges (even if they are not adjacent).\n\t\tif ( ranges.length > 1 ) {\n\t\t\tconst selectionStart = ranges[ 0 ].start;\n\t\t\tconst selectionEnd = ranges[ ranges.length - 1 ].end;\n\n\t\t\tfixedRanges = [ new Range( selectionStart, selectionEnd ) ];\n\t\t}\n\n\t\twriter.setSelection( fixedRanges, { backward: selection.isBackward } );\n\t}\n}\n\n// Tries fixing a range if it's incorrect.\n//\n// @param {module:engine/model/range~Range} range\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingRange( range, schema ) {\n\tif ( range.isCollapsed ) {\n\t\treturn tryFixingCollapsedRange( range, schema );\n\t}\n\n\treturn tryFixingNonCollapsedRage( range, schema );\n}\n\n// Tries to fix collapsed ranges.\n//\n// * Fixes situation when a range is in a place where $text is not allowed\n//\n// @param {module:engine/model/range~Range} range Collapsed range to fix.\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingCollapsedRange( range, schema ) {\n\tconst originalPosition = range.start;\n\n\tconst nearestSelectionRange = schema.getNearestSelectionRange( originalPosition );\n\n\t// This might be null ie when editor data is empty.\n\t// In such cases there is no need to fix the selection range.\n\tif ( !nearestSelectionRange ) {\n\t\treturn null;\n\t}\n\n\tconst fixedPosition = nearestSelectionRange.start;\n\n\t// Fixed position is the same as original - no need to return corrected range.\n\tif ( originalPosition.isEqual( fixedPosition ) ) {\n\t\treturn null;\n\t}\n\n\t// Check single node selection (happens in tables).\n\tif ( fixedPosition.nodeAfter && schema.isLimit( fixedPosition.nodeAfter ) ) {\n\t\treturn new Range( fixedPosition, Position.createAfter( fixedPosition.nodeAfter ) );\n\t}\n\n\treturn new Range( fixedPosition );\n}\n\n// Tries to fix an expanded range.\n//\n// @param {module:engine/model/range~Range} range Expanded range to fix.\n// @param {module:engine/model/schema~Schema} schema\n// @returns {module:engine/model/range~Range|null} Returns fixed range or null if range is valid.\nfunction tryFixingNonCollapsedRage( range, schema ) {\n\tconst start = range.start;\n\tconst end = range.end;\n\n\tconst isTextAllowedOnStart = schema.checkChild( start, '$text' );\n\tconst isTextAllowedOnEnd = schema.checkChild( end, '$text' );\n\n\tconst startLimitElement = schema.getLimitElement( start );\n\tconst endLimitElement = schema.getLimitElement( end );\n\n\t// Ranges which both end are inside the same limit element (or root) might needs only minor fix.\n\tif ( startLimitElement === endLimitElement ) {\n\t\t// Range is valid when both position allows to place a text:\n\t\t// - <block>f[oobarba]z</block>\n\t\t// This would be \"fixed\" by a next check but as it will be the same it's better to return null so the selection stays the same.\n\t\tif ( isTextAllowedOnStart && isTextAllowedOnEnd ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Range that is on non-limit element (or is partially) must be fixed so it is placed inside the block around $text:\n\t\t// - [<block>foo</block>]    ->    <block>[foo]</block>\n\t\t// - [<block>foo]</block>    ->    <block>[foo]</block>\n\t\t// - <block>f[oo</block>]    ->    <block>f[oo]</block>\n\t\tif ( checkSelectionOnNonLimitElements( start, end, schema ) ) {\n\t\t\tconst fixedStart = schema.getNearestSelectionRange( start, 'forward' );\n\t\t\tconst fixedEnd = schema.getNearestSelectionRange( end, 'backward' );\n\n\t\t\treturn new Range( fixedStart ? fixedStart.start : start, fixedEnd ? fixedEnd.start : end );\n\t\t}\n\t}\n\n\tconst isStartInLimit = startLimitElement && !startLimitElement.is( 'rootElement' );\n\tconst isEndInLimit = endLimitElement && !endLimitElement.is( 'rootElement' );\n\n\t// At this point we eliminated valid positions on text nodes so if one of range positions is placed inside a limit element\n\t// then the range crossed limit element boundaries and needs to be fixed.\n\tif ( isStartInLimit || isEndInLimit ) {\n\t\t// Although we've already found limit element on start/end positions we must find the outer-most limit element.\n\t\t// as limit elements might be nested directly inside (ie table > tableRow > tableCell).\n\t\tconst fixedStart = isStartInLimit ? expandSelectionOnIsLimitNode( Position.createAt( startLimitElement ), schema, 'start' ) : start;\n\t\tconst fixedEnd = isEndInLimit ? expandSelectionOnIsLimitNode( Position.createAt( endLimitElement ), schema, 'end' ) : end;\n\n\t\treturn new Range( fixedStart, fixedEnd );\n\t}\n\n\t// Range was not fixed at this point so it is valid - ie it was placed around limit element already.\n\treturn null;\n}\n\n// Expands selection so it contains whole limit node.\n//\n// @param {module:engine/model/position~Position} position\n// @param {module:engine/model/schema~Schema} schema\n// @param {String} expandToDirection Direction of expansion - either 'start' or 'end' of the range.\n// @returns {module:engine/model/position~Position}\nfunction expandSelectionOnIsLimitNode( position, schema, expandToDirection ) {\n\tlet node = position.parent;\n\tlet parent = node;\n\n\t// Find outer most isLimit block as such blocks might be nested (ie. in tables).\n\twhile ( schema.isLimit( parent ) && parent.parent ) {\n\t\tnode = parent;\n\t\tparent = parent.parent;\n\t}\n\n\t// Depending on direction of expanding selection return position before or after found node.\n\treturn expandToDirection === 'start' ? Position.createBefore( node ) : Position.createAfter( node );\n}\n\n// Checks whether both range ends are placed around non-limit elements.\n//\n// @param {module:engine/model/position~Position} start\n// @param {module:engine/model/position~Position} end\n// @param {module:engine/model/schema~Schema} schema\nfunction checkSelectionOnNonLimitElements( start, end, schema ) {\n\tconst startIsOnBlock = ( start.nodeAfter && !schema.isLimit( start.nodeAfter ) ) || schema.checkChild( start, '$text' );\n\tconst endIsOnBlock = ( end.nodeBefore && !schema.isLimit( end.nodeBefore ) ) || schema.checkChild( end, '$text' );\n\n\treturn startIsOnBlock && endIsOnBlock;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/model/model\n */\n\n// Load all basic deltas and transformations, they register themselves.\nimport './delta/basic-deltas';\nimport './delta/basic-transformations';\n\nimport Batch from './batch';\nimport Writer from './writer';\nimport Schema from './schema';\nimport Document from './document';\nimport MarkerCollection from './markercollection';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport deltaTransform from './delta/transform';\nimport ModelElement from './element';\nimport ModelRange from './range';\n\nimport insertContent from './utils/insertcontent';\nimport deleteContent from './utils/deletecontent';\nimport modifySelection from './utils/modifyselection';\nimport getSelectedContent from './utils/getselectedcontent';\nimport { injectSelectionPostFixer } from './utils/selection-post-fixer';\n\n/**\n * Editor's data model. Read about the model in the\n * {@glink framework/guides/architecture/editing-engine engine architecture guide}.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Model {\n\tconstructor() {\n\t\t/**\n\t\t * Model's marker collection.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/markercollection~MarkerCollection}\n\t\t */\n\t\tthis.markers = new MarkerCollection();\n\n\t\t/**\n\t\t * Model's document.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/document~Document}\n\t\t */\n\t\tthis.document = new Document( this );\n\n\t\t/**\n\t\t * Model's schema.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/schema~Schema}\n\t\t */\n\t\tthis.schema = new Schema();\n\n\t\t/**\n\t\t * All callbacks added by {@link module:engine/model/model~Model#change} or\n\t\t * {@link module:engine/model/model~Model#enqueueChange} methods waiting to be executed.\n\t\t *\n\t\t * @private\n\t\t * @type {Array.<Function>}\n\t\t */\n\t\tthis._pendingChanges = [];\n\n\t\t/**\n\t\t * The last created and currently used writer instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/writer~Writer}\n\t\t */\n\t\tthis._currentWriter = null;\n\n\t\t[ 'insertContent', 'deleteContent', 'modifySelection', 'getSelectedContent', 'applyOperation' ]\n\t\t\t.forEach( methodName => this.decorate( methodName ) );\n\n\t\t// Adding operation validation with `highest` priority, so it is called before any other feature would like\n\t\t// to do anything with the operation. If the operation has incorrect parameters it should throw on the earliest occasion.\n\t\tthis.on( 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\toperation._validate();\n\t\t}, { priority: 'highest' } );\n\n\t\t// Register some default abstract entities.\n\t\tthis.schema.register( '$root', {\n\t\t\tisLimit: true\n\t\t} );\n\t\tthis.schema.register( '$block', {\n\t\t\tallowIn: '$root',\n\t\t\tisBlock: true\n\t\t} );\n\t\tthis.schema.register( '$text', {\n\t\t\tallowIn: '$block'\n\t\t} );\n\t\tthis.schema.register( '$clipboardHolder', {\n\t\t\tallowContentOf: '$root',\n\t\t\tisLimit: true\n\t\t} );\n\t\tthis.schema.extend( '$text', { allowIn: '$clipboardHolder' } );\n\n\t\t// Element needed by `upcastElementToMarker` converter.\n\t\t// This element temporarily represents marker bound during conversion process and is removed\n\t\t// at the end of conversion. `UpcastDispatcher` or at least `Conversion` class looks like a better for this\n\t\t// registration but both know nothing about Schema.\n\t\tthis.schema.register( '$marker', {\n\t\t\tallowIn: [ '$root', '$block' ]\n\t\t} );\n\n\t\tinjectSelectionPostFixer( this );\n\t}\n\n\t/**\n\t * The `change()` method is the primary way of changing the model. You should use it to modify all document nodes\n\t * (including detached nodes – i.e. nodes not added to the {@link module:engine/model/model~Model#document model document}),\n\t * the {@link module:engine/model/document~Document#selection document's selection}, and\n\t * {@link module:engine/model/model~Model#markers model markers}.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t} );\n\t *\n\t * All changes inside the change block use the same {@link module:engine/model/batch~Batch} so they are combined\n\t * into a single undo step.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' ); // foo.\n\t *\n\t *\t\t\tmodel.change( writer => {\n\t *\t\t\t\twriter.insertText( 'bar', paragraph, 'end' ); // foobar.\n\t *\t\t\t} );\n\t *\n\t * \t\t\twriter.insertText( 'bom', paragraph, 'end' ); // foobarbom.\n\t *\t\t} );\n\t *\n\t * The callback of the `change()` block is executed synchronously.\n\t *\n\t * You can also return a value from the change block.\n\t *\n\t *\t\tconst img = model.change( writer => {\n\t *\t\t\treturn writer.createElement( 'img' );\n\t *\t\t} );\n\t *\n\t * @see #enqueueChange\n\t * @param {Function} callback Callback function which may modify the model.\n\t * @returns {*} Value returned by the callback.\n\t */\n\tchange( callback ) {\n\t\tif ( this._pendingChanges.length === 0 ) {\n\t\t\t// If this is the outermost block, create a new batch and start `_runPendingChanges` execution flow.\n\t\t\tthis._pendingChanges.push( { batch: new Batch(), callback } );\n\n\t\t\treturn this._runPendingChanges()[ 0 ];\n\t\t} else {\n\t\t\t// If this is not the outermost block, just execute the callback.\n\t\t\treturn callback( this._currentWriter );\n\t\t}\n\t}\n\n\t/**\n\t * The `enqueueChange()` method performs similar task as the {@link #change `change()` method}, with two major differences.\n\t *\n\t * First, the callback of `enqueueChange()` is executed when all other enqueued changes are done. It might be executed\n\t * immediately if it is not nested in any other change block, but if it is nested in another (enqueue)change block,\n\t * it will be delayed and executed after the outermost block.\n\t *\n\t *\t\tmodel.change( writer => {\n\t *\t\t\tconsole.log( 1 );\n\t *\n\t *\t\t\tmodel.enqueueChange( writer => {\n\t *\t\t\t\tconsole.log( 2 );\n\t *\t\t\t} );\n\t *\n\t * \t\t\tconsole.log( 3 );\n\t *\t\t} ); // Will log: 1, 3, 2.\n\t *\n\t * Second, it lets you define the {@link module:engine/model/batch~Batch} into which you want to add your changes.\n\t * By default, a new batch is created. In the sample above, `change` and `enqueueChange` blocks use a different\n\t * batch (and different {@link module:engine/model/writer~Writer} since each of them operates on the separate batch).\n\t *\n\t * When using the `enqueueChange()` block you can also add some changes to the batch you used before.\n\t *\n\t *\t\tmodel.enqueueChange( batch, writer => {\n\t *\t\t\twriter.insertText( 'foo', paragraph, 'end' );\n\t *\t\t} );\n\t *\n\t * The batch instance can be obtained from {@link module:engine/model/writer~Writer#batch the writer}.\n\t *\n\t * @param {module:engine/model/batch~Batch|'transparent'|'default'} batchOrType Batch or batch type should be used in the callback.\n\t * If not defined, a new batch will be created.\n\t * @param {Function} callback Callback function which may modify the model.\n\t */\n\tenqueueChange( batchOrType, callback ) {\n\t\tif ( typeof batchOrType === 'string' ) {\n\t\t\tbatchOrType = new Batch( batchOrType );\n\t\t} else if ( typeof batchOrType == 'function' ) {\n\t\t\tcallback = batchOrType;\n\t\t\tbatchOrType = new Batch();\n\t\t}\n\n\t\tthis._pendingChanges.push( { batch: batchOrType, callback } );\n\n\t\tif ( this._pendingChanges.length == 1 ) {\n\t\t\tthis._runPendingChanges();\n\t\t}\n\t}\n\n\t/**\n\t * {@link module:utils/observablemixin~ObservableMixin#decorate Decorated} function to apply\n\t * {@link module:engine/model/operation/operation~Operation operations} on the model.\n\t *\n\t * @param {module:engine/model/operation/operation~Operation} operation Operation to apply\n\t */\n\tapplyOperation( operation ) {\n\t\toperation._execute();\n\t}\n\n\t/**\n\t * Transforms two sets of deltas by themselves. Returns both transformed sets.\n\t *\n\t * @param {Array.<module:engine/model/delta/delta~Delta>} deltasA Array with the first set of deltas to transform. These\n\t * deltas are considered more important (than `deltasB`) when resolving conflicts.\n\t * @param {Array.<module:engine/model/delta/delta~Delta>} deltasB Array with the second set of deltas to transform. These\n\t * deltas are considered less important (than `deltasA`) when resolving conflicts.\n\t * @param {Boolean} [useContext=false] When set to `true`, transformation will store and use additional context\n\t * information to guarantee more expected results. Should be used whenever deltas related to already applied\n\t * deltas are transformed (for example when undoing changes).\n\t * @returns {Object}\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} return.deltasA The first set of deltas transformed\n\t * by the second set of deltas.\n\t * @returns {Array.<module:engine/model/delta/delta~Delta>} return.deltasB The second set of deltas transformed\n\t * by the first set of deltas.\n\t */\n\ttransformDeltas( deltasA, deltasB, useContext = false ) {\n\t\treturn deltaTransform.transformDeltaSets( deltasA, deltasB, useContext ? this.document : null );\n\t}\n\n\t/**\n\t * Inserts content into the editor (specified selection) as one would expect the paste\n\t * functionality to work.\n\t *\n\t * @fires insertContent\n\t * @param {module:engine/model/documentfragment~DocumentFragment|module:engine/model/item~Item} content The content to insert.\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * Selection into which the content should be inserted.\n\t */\n\tinsertContent( content, selection ) {\n\t\tinsertContent( this, content, selection );\n\t}\n\n\t/**\n\t * Deletes content of the selection and merge siblings. The resulting selection is always collapsed.\n\t *\n\t * **Note:** For the sake of predictability, the resulting selection should always be collapsed.\n\t * In cases where a feature wants to modify deleting behavior so selection isn't collapsed\n\t * (e.g. a table feature may want to keep row selection after pressing <kbd>Backspace</kbd>),\n\t * then that behavior should be implemented in the view's listener. At the same time, the table feature\n\t * will need to modify this method's behavior too, e.g. to \"delete contents and then collapse\n\t * the selection inside the last selected cell\" or \"delete the row and collapse selection somewhere near\".\n\t * That needs to be done in order to ensure that other features which use `deleteContent()` will work well with tables.\n\t *\n\t * @fires deleteContent\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * Selection of which the content should be deleted.\n\t * @param {module:engine/model/batch~Batch} batch Batch to which the deltas will be added.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.leaveUnmerged=false] Whether to merge elements after removing the content of the selection.\n\t *\n\t * For example `<heading>x[x</heading><paragraph>y]y</paragraph>` will become:\n\t *\n\t * * `<heading>x^y</heading>` with the option disabled (`leaveUnmerged == false`)\n\t * * `<heading>x^</heading><paragraph>y</paragraph>` with enabled (`leaveUnmerged == true`).\n\t *\n\t * Note: {@link module:engine/model/schema~Schema#isObject object} and {@link module:engine/model/schema~Schema#isLimit limit}\n\t * elements will not be merged.\n\t *\n\t * @param {Boolean} [options.doNotResetEntireContent=false] Whether to skip replacing the entire content with a\n\t * paragraph when the entire content was selected.\n\t *\n\t * For example `<heading>[x</heading><paragraph>y]</paragraph>` will become:\n\t *\n\t * * `<paragraph>^</paragraph>` with the option disabled (`doNotResetEntireContent == false`)\n\t * * `<heading>^</heading>` with enabled (`doNotResetEntireContent == true`)\n\t */\n\tdeleteContent( selection, options ) {\n\t\tdeleteContent( this, selection, options );\n\t}\n\n\t/**\n\t * Modifies the selection. Currently, the supported modifications are:\n\t *\n\t * * Extending. The selection focus is moved in the specified `options.direction` with a step specified in `options.unit`.\n\t * Possible values for `unit` are:\n\t *  * `'character'` (default) - moves selection by one user-perceived character. In most cases this means moving by one\n\t *  character in `String` sense. However, unicode also defines \"combing marks\". These are special symbols, that combines\n\t *  with a symbol before it (\"base character\") to create one user-perceived character. For example, `q̣̇` is a normal\n\t *  letter `q` with two \"combining marks\": upper dot (`Ux0307`) and lower dot (`Ux0323`). For most actions, i.e. extending\n\t *  selection by one position, it is correct to include both \"base character\" and all of it's \"combining marks\". That is\n\t *  why `'character'` value is most natural and common method of modifying selection.\n\t *  * `'codePoint'` - moves selection by one unicode code point. In contrary to, `'character'` unit, this will insert\n\t *  selection between \"base character\" and \"combining mark\", because \"combining marks\" have their own unicode code points.\n\t *  However, for technical reasons, unicode code points with values above `UxFFFF` are represented in native `String` by\n\t *  two characters, called \"surrogate pairs\". Halves of \"surrogate pairs\" have a meaning only when placed next to each other.\n\t *  For example `𨭎` is represented in `String` by `\\uD862\\uDF4E`. Both `\\uD862` and `\\uDF4E` do not have any meaning\n\t *  outside the pair (are rendered as ? when alone). Position between them would be incorrect. In this case, selection\n\t *  extension will include whole \"surrogate pair\".\n\t *  * `'word'` - moves selection by a whole word.\n\t *\n\t * **Note:** if you extend a forward selection in a backward direction you will in fact shrink it.\n\t *\n\t * @fires modifySelection\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * The selection to modify.\n\t * @param {Object} [options]\n\t * @param {'forward'|'backward'} [options.direction='forward'] The direction in which the selection should be modified.\n\t * @param {'character'|'codePoint'|'word'} [options.unit='character'] The unit by which selection should be modified.\n\t */\n\tmodifySelection( selection, options ) {\n\t\tmodifySelection( this, selection, options );\n\t}\n\n\t/**\n\t * Gets a clone of the selected content.\n\t *\n\t * For example, for the following selection:\n\t *\n\t * ```html\n\t * <p>x</p><quote><p>y</p><h>fir[st</h></quote><p>se]cond</p><p>z</p>\n\t * ```\n\t *\n\t * It will return a document fragment with such a content:\n\t *\n\t * ```html\n\t * <quote><h>st</h></quote><p>se</p>\n\t * ```\n\t *\n\t * @fires getSelectedContent\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n\t * The selection of which content will be returned.\n\t * @returns {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tgetSelectedContent( selection ) {\n\t\treturn getSelectedContent( this, selection );\n\t}\n\n\t/**\n\t * Checks whether given {@link module:engine/model/range~Range range} or {@link module:engine/model/element~Element element}\n\t * has any content.\n\t *\n\t * Content is any text node or element which is registered in {@link module:engine/model/schema~Schema schema}.\n\t *\n\t * @param {module:engine/model/range~Range|module:engine/model/element~Element} rangeOrElement Range or element to check.\n\t * @returns {Boolean}\n\t */\n\thasContent( rangeOrElement ) {\n\t\tif ( rangeOrElement instanceof ModelElement ) {\n\t\t\trangeOrElement = ModelRange.createIn( rangeOrElement );\n\t\t}\n\n\t\tif ( rangeOrElement.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const item of rangeOrElement.getItems() ) {\n\t\t\t// Remember, `TreeWalker` returns always `textProxy` nodes.\n\t\t\tif ( item.is( 'textProxy' ) || this.schema.isObject( item ) ) {\n\t\t\t\treturn true;\n\t\t\t}\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Removes all events listeners set by model instance and destroys {@link module:engine/model/document~Document}.\n\t */\n\tdestroy() {\n\t\tthis.document.destroy();\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Common part of {@link module:engine/model/model~Model#change} and {@link module:engine/model/model~Model#enqueueChange}\n\t * which calls callbacks and returns array of values returned by these callbacks.\n\t *\n\t * @private\n\t * @returns {Array.<*>} Array of values returned by callbacks.\n\t */\n\t_runPendingChanges() {\n\t\tconst ret = [];\n\n\t\twhile ( this._pendingChanges.length ) {\n\t\t\t// Create a new writer using batch instance created for this chain of changes.\n\t\t\tconst currentBatch = this._pendingChanges[ 0 ].batch;\n\t\t\tthis._currentWriter = new Writer( this, currentBatch );\n\n\t\t\t// Execute changes callback and gather the returned value.\n\t\t\tconst callbackReturnValue = this._pendingChanges[ 0 ].callback( this._currentWriter );\n\t\t\tret.push( callbackReturnValue );\n\n\t\t\t// Fire internal `_change` event.\n\t\t\tthis.fire( '_change', this._currentWriter );\n\n\t\t\tthis._pendingChanges.shift();\n\t\t\tthis._currentWriter = null;\n\t\t}\n\n\t\treturn ret;\n\t}\n\n\t/**\n\t * Fired after leaving each {@link module:engine/model/model~Model#enqueueChange} block or outermost\n\t * {@link module:engine/model/model~Model#change} block.\n\t *\n\t * **Note:** This is an internal event! Use {@link module:engine/model/document~Document#event:change} instead.\n\t *\n\t * @protected\n\t * @event _change\n\t * @param {module:engine/model/writer~Writer} writer `Writer` instance that has been used in the change block.\n\t */\n\n\t/**\n\t * Fired every time any {@link module:engine/model/operation/operation~Operation operation} is applied on the model\n\t * using {@link #applyOperation}.\n\t *\n\t * Note that this event is suitable only for very specific use-cases. Use it if you need to listen to every single operation\n\t * applied on the document. However, in most cases {@link module:engine/model/document~Document#event:change} should\n\t * be used.\n\t *\n\t * A few callbacks are already added to this event by engine internal classes:\n\t *\n\t * * with `highest` priority operation is validated,\n\t * * with `normal` priority operation is executed,\n\t * * with `low` priority the {@link module:engine/model/document~Document} updates its version,\n\t * * with `low` priority {@link module:engine/model/liveposition~LivePosition} and {@link module:engine/model/liverange~LiveRange}\n\t * update themselves.\n\t *\n\t * @event applyOperation\n\t * @param {Array} args Arguments of the `applyOperation` which is an array with a single element - applied\n\t * {@link module:engine/model/operation/operation~Operation operation}.\n\t */\n\n\t/**\n\t * Event fired when {@link #insertContent} method is called.\n\t *\n\t * The {@link #insertContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event insertContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #deleteContent} method is called.\n\t *\n\t * The {@link #deleteContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event deleteContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #modifySelection} method is called.\n\t *\n\t * The {@link #modifySelection default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event modifySelection\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n\n\t/**\n\t * Event fired when {@link #getSelectedContent} method is called.\n\t *\n\t * The {@link #getSelectedContent default action of that method} is implemented as a\n\t * listener to this event so it can be fully customized by the features.\n\t *\n\t * @event getSelectedContent\n\t * @param {Array} args The arguments passed to the original method.\n\t */\n}\n\nmix( Model, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/keystrokehandler\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport { getCode, parseKeystroke } from './keyboard';\n\n/**\n * Keystroke handler registers keystrokes so the callbacks associated\n * with these keystrokes will be executed if the matching `keydown` is fired\n * by a defined emitter.\n *\n *\t\tconst handler = new KeystrokeHandler();\n *\n *\t\thandler.listenTo( emitter );\n *\n *\t\thandler.set( 'Ctrl+A', ( keyEvtData, cancel ) => {\n *\t\t\tconsole.log( 'Ctrl+A has been pressed' );\n *\t\t\tcancel();\n *\t\t} );\n */\nexport default class KeystrokeHandler {\n\t/**\n\t * Creates an instance of the keystroke handler.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Listener used to listen to events for easier keystroke handler destruction.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/dom/emittermixin~Emitter}\n\t\t */\n\t\tthis._listener = Object.create( DomEmitterMixin );\n\t}\n\n\t/**\n\t * Starts listening for `keydown` events from a given emitter.\n\t *\n\t * @param {module:utils/emittermixin~Emitter} emitter\n\t */\n\tlistenTo( emitter ) {\n\t\t// The #_listener works here as a kind of dispatcher. It groups the events coming from the same\n\t\t// keystroke so the listeners can be attached to them with different priorities.\n\t\t//\n\t\t// E.g. all the keystrokes with the `keyCode` of 42 coming from the `emitter` are propagated\n\t\t// as a `_keydown:42` event by the `_listener`. If there's a callback created by the `set`\n\t\t// method for this 42 keystroke, it listens to the `_listener#_keydown:42` event only and interacts\n\t\t// only with other listeners of this particular event, thus making it possible to prioritize\n\t\t// the listeners and safely cancel execution, when needed. Instead of duplicating the Emitter logic,\n\t\t// the KeystrokeHandler re–uses it to do its job.\n\t\tthis._listener.listenTo( emitter, 'keydown', ( evt, keyEvtData ) => {\n\t\t\tthis._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t\t} );\n\t}\n\n\t/**\n\t * Registers a handler for the specified keystroke.\n\t *\n\t * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by\n\t * the {@link module:utils/keyboard~parseKeystroke} function.\n\t * @param {Function} callback A function called with the\n\t * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and\n\t * a helper to both `preventDefault` and `stopPropagation` of the event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke\n\t * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority\n\t * are called in the order they were added.\n\t */\n\tset( keystroke, callback, options = {} ) {\n\t\tconst keyCode = parseKeystroke( keystroke );\n\t\tconst priority = options.priority;\n\n\t\t// Execute the passed callback on KeystrokeHandler#_keydown.\n\t\t// TODO: https://github.com/ckeditor/ckeditor5-utils/issues/144\n\t\tthis._listener.listenTo( this._listener, '_keydown:' + keyCode, ( evt, keyEvtData ) => {\n\t\t\tcallback( keyEvtData, () => {\n\t\t\t\t// Stop the event in the DOM: no listener in the web page\n\t\t\t\t// will be triggered by this event.\n\t\t\t\tkeyEvtData.preventDefault();\n\t\t\t\tkeyEvtData.stopPropagation();\n\n\t\t\t\t// Stop the event in the KeystrokeHandler: no more callbacks\n\t\t\t\t// will be executed for this keystroke.\n\t\t\t\tevt.stop();\n\t\t\t} );\n\n\t\t\t// Mark this keystroke as handled by the callback. See: #press.\n\t\t\tevt.return = true;\n\t\t}, { priority } );\n\t}\n\n\t/**\n\t * Triggers a keystroke handler for a specified key combination, if such a keystroke was {@link #set defined}.\n\t *\n\t * @param {module:engine/view/observer/keyobserver~KeyEventData} keyEvtData Key event data.\n\t * @returns {Boolean} Whether the keystroke was handled.\n\t */\n\tpress( keyEvtData ) {\n\t\treturn !!this._listener.fire( '_keydown:' + getCode( keyEvtData ), keyEvtData );\n\t}\n\n\t/**\n\t * Destroys the keystroke handler.\n\t */\n\tdestroy() {\n\t\tthis._listener.stopListening();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/editingkeystrokehandler\n */\n\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\n\n/**\n * A keystroke handler for editor editing. Its instance is available\n * in {@link module:core/editor/editor~Editor#keystrokes} so plugins\n * can register their keystrokes.\n *\n * E.g. an undo plugin would do this:\n *\n *\t\teditor.keystrokes.set( 'Ctrl+Z', 'undo' );\n *\t\teditor.keystrokes.set( 'Ctrl+Shift+Z', 'redo' );\n *\t\teditor.keystrokes.set( 'Ctrl+Y', 'redo' );\n *\n * @extends utils/keystrokehandler~KeystrokeHandler\n */\nexport default class EditingKeystrokeHandler extends KeystrokeHandler {\n\t/**\n\t * Creates an instance of the keystroke handler.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t */\n\tconstructor( editor ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * The editor instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\t}\n\n\t/**\n\t * Registers a handler for the specified keystroke.\n\t *\n\t * The handler can be specified as a command name or a callback.\n\t *\n\t * @param {String|Array.<String|Number>} keystroke Keystroke defined in a format accepted by\n\t * the {@link module:utils/keyboard~parseKeystroke} function.\n\t * @param {Function|String} callback If a string is passed, then the keystroke will\n\t * {@link module:core/editor/editor~Editor#execute execute a command}.\n\t * If a function, then it will be called with the\n\t * {@link module:engine/view/observer/keyobserver~KeyEventData key event data} object and\n\t * a `cancel()` helper to both `preventDefault()` and `stopPropagation()` of the event.\n\t * @param {Object} [options={}] Additional options.\n\t * @param {module:utils/priorities~PriorityString|Number} [options.priority='normal'] The priority of the keystroke\n\t * callback. The higher the priority value the sooner the callback will be executed. Keystrokes having the same priority\n\t * are called in the order they were added.\n\t */\n\tset( keystroke, callback, options = {} ) {\n\t\tif ( typeof callback == 'string' ) {\n\t\t\tconst commandName = callback;\n\n\t\t\tcallback = ( evtData, cancel ) => {\n\t\t\t\tthis.editor.execute( commandName );\n\t\t\t\tcancel();\n\t\t\t};\n\t\t}\n\n\t\tsuper.set( keystroke, callback, options );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/editor/editor\n */\n\nimport Config from '@ckeditor/ckeditor5-utils/src/config';\nimport EditingController from '@ckeditor/ckeditor5-engine/src/controller/editingcontroller';\nimport PluginCollection from '../plugincollection';\nimport CommandCollection from '../commandcollection';\nimport Locale from '@ckeditor/ckeditor5-utils/src/locale';\nimport DataController from '@ckeditor/ckeditor5-engine/src/controller/datacontroller';\nimport Conversion from '@ckeditor/ckeditor5-engine/src/conversion/conversion';\nimport Model from '@ckeditor/ckeditor5-engine/src/model/model';\nimport EditingKeystrokeHandler from '../editingkeystrokehandler';\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\nimport '@ckeditor/ckeditor5-utils/src/version';\n\n/**\n * Class representing a basic, generic editor.\n *\n * Check out the list of its subclasses to learn about specific editor implementations.\n *\n * All editor implementations (like {@link module:editor-classic/classiceditor~ClassicEditor} or\n * {@link module:editor-inline/inlineeditor~InlineEditor}) should extend this class. They can add their\n * own methods and properties.\n *\n * When you are implementing a plugin, then this editor represents the API\n * which your plugin can expect to get when using its {@link module:core/plugin~Plugin#editor} property.\n *\n * This API should be sufficient in order to implement the \"editing\" part of your feature\n * (schema definition, conversion, commands, keystrokes, etc.).\n * It does not define the editor UI, which is available only if the\n * the specific editor implements also the {@link module:core/editor/editorwithui~EditorWithUI} interface\n * (as most editor implementations do).\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Editor {\n\t/**\n\t * Creates a new instance of the Editor class.\n\t *\n\t * Usually, not to be used directly. See the static {@link module:core/editor/editor~Editor.create `create()`} method.\n\t *\n\t * @param {Object} config The editor config.\n\t */\n\tconstructor( config ) {\n\t\tconst availablePlugins = this.constructor.builtinPlugins;\n\n\t\t/**\n\t\t * Holds all configurations specific to this editor instance.\n\t\t *\n\t\t *\t\teditor.config.get( 'image.toolbar' );\n\t\t *\t\t// -> [ 'imageStyle:full', 'imageStyle:side', '|', 'imageTextAlternative' ]\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/config~Config}\n\t\t */\n\t\tthis.config = new Config( config, this.constructor.defaultConfig );\n\n\t\tthis.config.define( 'plugins', availablePlugins );\n\n\t\t/**\n\t\t * The plugins loaded and in use by this editor instance.\n\t\t *\n\t\t *\t\teditor.plugins.get( 'Clipboard' ); // -> instance of the Clipboard plugin.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/plugincollection~PluginCollection}\n\t\t */\n\t\tthis.plugins = new PluginCollection( this, availablePlugins );\n\n\t\t/**\n\t\t * Commands registered to the editor.\n\t\t *\n\t\t * Use the shorthand {@link #execute `editor.execute()`} method to execute commands:\n\t\t *\n\t\t *\t\t// Execute the bold command:\n\t\t *\t\teditor.execute( 'bold' );\n\t\t *\n\t\t *\t\t// Check the state of the bold command:\n\t\t *\t\teditor.commands.get( 'bold' ).value;\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/commandcollection~CommandCollection}\n\t\t */\n\t\tthis.commands = new CommandCollection();\n\n\t\t/**\n\t\t * @readonly\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = new Locale( this.config.get( 'language' ) );\n\n\t\t/**\n\t\t * Shorthand for {@link module:utils/locale~Locale#t}.\n\t\t *\n\t\t * @see module:utils/locale~Locale#t\n\t\t * @method #t\n\t\t */\n\t\tthis.t = this.locale.t;\n\n\t\t/**\n\t\t * Indicates the editor life-cycle state.\n\t\t *\n\t\t * The editor is in one of the following states:\n\t\t *\n\t\t * * `initializing` - during the editor initialization (before {@link module:core/editor/editor~Editor.create `Editor.create()`})\n\t\t * finished its job,\n\t\t * * `ready` - after the promise returned by the {@link module:core/editor/editor~Editor.create `Editor.create()`}\n\t\t * method is resolved,\n\t\t * * `destroyed` - once the {@link #destroy `editor.destroy()`} method was called.\n\t\t *\n\t\t * @observable\n\t\t * @member {'initializing'|'ready'|'destroyed'} #state\n\t\t */\n\t\tthis.set( 'state', 'initializing' );\n\t\tthis.once( 'ready', () => ( this.state = 'ready' ), { priority: 'high' } );\n\t\tthis.once( 'destroy', () => ( this.state = 'destroyed' ), { priority: 'high' } );\n\n\t\t/**\n\t\t * Defines whether this editor is in read-only mode.\n\t\t *\n\t\t * In read-only mode the editor {@link #commands commands} are disabled so it is not possible\n\t\t * to modify document by using them.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * The editor's model.\n\t\t *\n\t\t * The central point of the editor's abstract data model.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model}\n\t\t */\n\t\tthis.model = new Model();\n\n\t\t/**\n\t\t * The {@link module:engine/controller/datacontroller~DataController data controller}.\n\t\t * Used e.g. for setting and retrieving editor data.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/datacontroller~DataController}\n\t\t */\n\t\tthis.data = new DataController( this.model );\n\n\t\t/**\n\t\t * The {@link module:engine/controller/editingcontroller~EditingController editing controller}.\n\t\t * Controls user input and rendering the content for editing.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/editingcontroller~EditingController}\n\t\t */\n\t\tthis.editing = new EditingController( this.model );\n\t\tthis.editing.view.document.bind( 'isReadOnly' ).to( this );\n\n\t\t/**\n\t\t * Conversion manager through which you can register model to view and view to model converters.\n\t\t *\n\t\t * See {@link module:engine/conversion/conversion~Conversion}'s documentation to learn how to add converters.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/conversion/conversion~Conversion}\n\t\t */\n\t\tthis.conversion = new Conversion();\n\n\t\tthis.conversion.register( 'downcast', [ this.editing.downcastDispatcher, this.data.downcastDispatcher ] );\n\t\tthis.conversion.register( 'editingDowncast', [ this.editing.downcastDispatcher ] );\n\t\tthis.conversion.register( 'dataDowncast', [ this.data.downcastDispatcher ] );\n\n\t\tthis.conversion.register( 'upcast', [ this.data.upcastDispatcher ] );\n\n\t\t/**\n\t\t * Instance of the {@link module:core/editingkeystrokehandler~EditingKeystrokeHandler}.\n\t\t *\n\t\t * It allows setting simple keystrokes:\n\t\t *\n\t\t *\t\t// Execute the bold command on Ctrl+E:\n\t\t *\t\teditor.keystrokes.set( 'Ctrl+E', 'bold' );\n\t\t *\n\t\t *\t\t// Execute your own callback:\n\t\t *\t\teditor.keystrokes.set( 'Ctrl+E', ( data, cancel ) => {\n\t\t *\t\t\tconsole.log( data.keyCode );\n\t\t *\n\t\t *\t\t\t// Prevent default (native) action and stop the underlying keydown event\n\t\t *\t\t\t// so no other editor feature will interfere.\n\t\t *\t\t\tcancel();\n\t\t *\t\t} );\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editingkeystrokehandler~EditingKeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new EditingKeystrokeHandler( this );\n\t\tthis.keystrokes.listenTo( this.editing.view.document );\n\t}\n\n\t/**\n\t * Loads and initializes plugins specified in the config.\n\t *\n\t * @returns {Promise} A promise which resolves once the initialization is completed.\n\t */\n\tinitPlugins() {\n\t\tconst that = this;\n\t\tconst config = this.config;\n\n\t\treturn loadPlugins()\n\t\t\t.then( loadedPlugins => {\n\t\t\t\treturn initPlugins( loadedPlugins, 'init' )\n\t\t\t\t\t.then( () => initPlugins( loadedPlugins, 'afterInit' ) );\n\t\t\t} )\n\t\t\t.then( () => this.fire( 'pluginsReady' ) );\n\n\t\tfunction loadPlugins() {\n\t\t\tconst plugins = config.get( 'plugins' ) || [];\n\t\t\tconst removePlugins = config.get( 'removePlugins' ) || [];\n\n\t\t\treturn that.plugins.load( plugins, removePlugins );\n\t\t}\n\n\t\tfunction initPlugins( loadedPlugins, method ) {\n\t\t\treturn loadedPlugins.reduce( ( promise, plugin ) => {\n\t\t\t\tif ( !plugin[ method ] ) {\n\t\t\t\t\treturn promise;\n\t\t\t\t}\n\n\t\t\t\treturn promise.then( plugin[ method ].bind( plugin ) );\n\t\t\t}, Promise.resolve() );\n\t\t}\n\t}\n\n\t/**\n\t * Destroys the editor instance, releasing all resources used by it.\n\t *\n\t * **Note** The editor cannot be destroyed during the initialization phase so if it is called\n\t * while the editor {@link #state is being initialized}, it will wait for the editor initialization before destroying it.\n\t *\n\t * @fires destroy\n\t * @returns {Promise} A promise that resolves once the editor instance is fully destroyed.\n\t */\n\tdestroy() {\n\t\tlet readyPromise = Promise.resolve();\n\n\t\tif ( this.state == 'initializing' ) {\n\t\t\treadyPromise = new Promise( resolve => this.once( 'ready', resolve ) );\n\t\t}\n\n\t\treturn readyPromise\n\t\t\t.then( () => {\n\t\t\t\tthis.fire( 'destroy' );\n\t\t\t\tthis.stopListening();\n\t\t\t\tthis.commands.destroy();\n\t\t\t} )\n\t\t\t.then( () => this.plugins.destroy() )\n\t\t\t.then( () => {\n\t\t\t\tthis.model.destroy();\n\t\t\t\tthis.data.destroy();\n\t\t\t\tthis.editing.destroy();\n\t\t\t\tthis.keystrokes.destroy();\n\t\t\t} );\n\t}\n\n\t/**\n\t * Executes specified command with given parameters.\n\t *\n\t * Shorthand for:\n\t *\n\t *\t\teditor.commands.get( commandName ).execute( ... );\n\t *\n\t * @param {String} commandName Name of command to execute.\n\t * @param {*} [...commandParams] Command parameters.\n\t */\n\texecute( ...args ) {\n\t\tthis.commands.execute( ...args );\n\t}\n\n\t/**\n\t * Creates and initializes a new editor instance.\n\t *\n\t * @param {Object} config The editor config. You can find the list of config options in\n\t * {@link module:core/editor/editorconfig~EditorConfig}.\n\t * @returns {Promise} Promise resolved once editor is ready.\n\t * @returns {module:core/editor/editor~Editor} return.editor The editor instance.\n\t */\n\tstatic create( config ) {\n\t\treturn new Promise( resolve => {\n\t\t\tconst editor = new this( config );\n\n\t\t\tresolve(\n\t\t\t\teditor.initPlugins()\n\t\t\t\t\t.then( () => {\n\t\t\t\t\t\teditor.fire( 'dataReady' );\n\t\t\t\t\t\teditor.fire( 'ready' );\n\t\t\t\t\t} )\n\t\t\t\t\t.then( () => editor )\n\t\t\t);\n\t\t} );\n\t}\n}\n\nmix( Editor, ObservableMixin );\n\n/**\n * Fired after {@link #initPlugins plugins are initialized}.\n *\n * @event pluginsReady\n */\n\n/**\n * Fired when the data loaded to the editor is ready. If a specific editor doesn't load\n * any data initially, this event will be fired right before {@link #event:ready}.\n *\n * @event dataReady\n */\n\n/**\n * Fired when {@link #event:pluginsReady plugins}, and {@link #event:dataReady data} and all additional\n * editor components are ready.\n *\n * Note: This event is most useful for plugin developers. When integrating the editor with your website or\n * application you do not have to listen to `editor#ready` because when the promise returned by the static\n * {@link module:core/editor/editor~Editor.create `Editor.create()`} event is resolved, the editor is already ready.\n * In fact, since the first moment when the editor instance is available to you is inside `then()`'s callback,\n * you cannot even add a listener to the `editor#ready` event.\n *\n * See also the {@link #state `editor.state`} property.\n *\n * @event ready\n */\n\n/**\n * Fired when this editor instance is destroyed. The editor at this point is not usable and this event should be used to\n * perform the clean-up in any plugin.\n *\n *\n * See also the {@link #state `editor.state`} property.\n *\n * @event destroy\n */\n\n/**\n * An array of plugins built into this editor class.\n * It is used in CKEditor 5 builds to provide a list of plugins which are later automatically initialized\n * during the editor initialization.\n *\n * They will be automatically initialized by the editor, unless listed in `config.removePlugins` and\n * unless `config.plugins` is passed.\n *\n *\t\t// Build some plugins into the editor class first.\n *\t\tClassicEditor.builtinPlugins = [ FooPlugin, BarPlugin ];\n *\n *\t\t// Normally, you need to define config.plugins, but since ClassicEditor.builtinPlugins was\n *\t\t// defined, now you can call create() without any configuration.\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> instance of the Foo plugin\n *\t\t\t\teditor.plugins.get( BarPlugin ); // -> instance of the Bar plugin\n *\t\t\t} );\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, {\n *\t\t\t\t// Don't initialize this plugins (note: it's defined by a string):\n *\t\t\t\tremovePlugins: [ 'Foo' ]\n *\t\t\t} )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> undefined\n *\t\t\t\teditor.config.get( BarPlugin ); // -> instance of the Bar plugin\n *\t\t\t} );\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, {\n *\t\t\t\t// Load only this plugin. Can also be define by a string if\n *\t\t\t\t// this plugin was built into the editor class.\n *\t\t\t\tplugins: [ FooPlugin ]\n *\t\t\t} )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.plugins.get( FooPlugin ); // -> instance of the Foo plugin\n *\t\t\t\teditor.config.get( BarPlugin ); // -> undefined\n *\t\t\t} );\n *\n * See also {@link module:core/editor/editor~Editor.defaultConfig}.\n *\n * @static\n * @member {Array.<Function>} module:core/editor/editor~Editor.builtinPlugins\n */\n\n/**\n * The default config which is built into the editor class.\n * It is used in CKEditor 5 builds to provide the default config options which are later used during editor initialization.\n *\n *\t\tClassicEditor.defaultConfig = {\n *\t\t\tfoo: 1,\n *\t\t\tbar: 2\n *\t\t};\n *\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.config.get( 'foo' ); // -> 1\n *\t\t\t\teditor.config.get( 'bar' ); // -> 2\n *\t\t\t} );\n *\n *\t\t// The default options can be overridden by the config passed to create().\n *\t\tClassicEditor\n *\t\t\t.create( sourceElement, { bar: 3 } )\n *\t\t\t.then( editor => {\n *\t\t\t\teditor.config.get( 'foo' ); // -> 1\n *\t\t\t\teditor.config.get( 'bar' ); // -> 3\n *\t\t\t} );\n *\n * See also {@link module:core/editor/editor~Editor.builtinPlugins}.\n *\n * @static\n * @member {Object} module:core/editor/editor~Editor.defaultConfig\n */\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/editor/utils/dataapimixin\n */\n\n/**\n * Implementation of the {@link module:core/editor/utils/dataapimixin~DataApi}.\n *\n * @mixin DataApiMixin\n * @implements module:core/editor/utils/dataapimixin~DataApi\n */\nconst DataApiMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tsetData( data ) {\n\t\tthis.data.set( data );\n\t},\n\n\t/**\n\t * @inheritDoc\n\t */\n\tgetData() {\n\t\treturn this.data.get();\n\t}\n};\n\nexport default DataApiMixin;\n\n/**\n * Interface defining editor methods for setting and getting data to and from the editor's main root element\n * using the {@link module:core/editor/editor~Editor#data data pipeline}.\n *\n * This interface is not a part of the {@link module:core/editor/editor~Editor} class because one may want to implement\n * an editor with multiple root elements, in which case the methods for setting and getting data will need to be implemented\n * differently.\n *\n * @interface DataApi\n */\n\n/**\n * Sets the data in the editor.\n *\n *\t\teditor.setData( '<p>This is editor!</p>' );\n *\n * By default the editor accepts HTML. This can be controlled by injecting a different data processor.\n * See the {@glink features/markdown Markdown output} guide for more details.\n *\n * Note: Not only is the format of the data configurable, but the type of the `setData()`'s parameter does not\n * have to be a string either. You can e.g. accept an object or a DOM `DocumentFragment` if you consider this\n * the right format for you.\n *\n * @method #setData\n * @param {String} data Input data.\n */\n\n/**\n * Gets the data from the editor.\n *\n *\t\teditor.getData(); // -> '<p>This is editor!</p>'\n *\n * By default the editor outputs HTML. This can be controlled by injecting a different data processor.\n * See the {@glink features/markdown Markdown output} guide for more details.\n *\n * Note: Not only is the format of the data configurable, but the type of the `getData()`'s return value does not\n * have to be a string either. You can e.g. return an object or a DOM `DocumentFragment`  if you consider this\n * the right format for you.\n *\n * @method #getData\n * @returns {String} Output data.\n */\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport setDataInElement from '@ckeditor/ckeditor5-utils/src/dom/setdatainelement';\n\n/**\n * @module core/editor/utils/elementapimixin\n */\n\n/**\n * Implementation of the {@link module:core/editor/utils/elementapimixin~ElementApi}.\n *\n * @mixin ElementApiMixin\n * @implements module:core/editor/utils/elementapimixin~ElementApi\n */\nconst ElementApiMixin = {\n\t/**\n\t * @inheritDoc\n\t */\n\tupdateSourceElement() {\n\t\tif ( !this.sourceElement ) {\n\t\t\t/**\n\t\t\t * Cannot update the source element of a detached editor.\n\t\t\t *\n\t\t\t * The {@link ~ElementApi#updateSourceElement `updateSourceElement()`} method cannot be called if you did not\n\t\t\t * pass an element to `Editor.create()`.\n\t\t\t *\n\t\t\t * @error editor-missing-sourceelement\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'editor-missing-sourceelement: Cannot update the source element of a detached editor.' );\n\t\t}\n\n\t\tsetDataInElement( this.sourceElement, this.data.get() );\n\t}\n};\n\nexport default ElementApiMixin;\n\n/**\n * Interface describing an editor that replaced a DOM element (was \"initialized on an element\").\n *\n * Such an editor should provide a method to\n * {@link module:core/editor/utils/elementapimixin~ElementApi#updateSourceElement update the replaced element with the current data}.\n *\n * @interface ElementApi\n */\n\n/**\n * The element on which the editor has been initialized.\n *\n * @readonly\n * @member {HTMLElement} #sourceElement\n */\n\n/**\n * Updates the {@link #sourceElement editor source element}'s content with the data.\n *\n * @method #updateSourceElement\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/setdatainelement\n */\n\n/* globals HTMLTextAreaElement */\n\n/**\n * Sets data in a given element.\n *\n * @param {HTMLElement} el The element in which the data will be set.\n * @param {String} data The data string.\n */\nexport default function setDataInElement( el, data ) {\n\tif ( el instanceof HTMLTextAreaElement ) {\n\t\tel.value = data;\n\t}\n\n\tel.innerHTML = data;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/dataprocessor/basichtmlwriter\n */\n\n/* globals document */\n\n/**\n * Basic HTML writer. It uses the native `innerHTML` property for basic conversion\n * from a document fragment to an HTML string.\n *\n * @implements module:engine/dataprocessor/htmlwriter~HtmlWriter\n */\nexport default class BasicHtmlWriter {\n\t/**\n\t * Returns an HTML string created from the document fragment.\n\t *\n\t * @param {DocumentFragment} fragment\n\t * @returns {String}\n\t */\n\tgetHtml( fragment ) {\n\t\tconst doc = document.implementation.createHTMLDocument( '' );\n\t\tconst container = doc.createElement( 'div' );\n\t\tcontainer.appendChild( fragment );\n\n\t\treturn container.innerHTML;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/dataprocessor/htmldataprocessor\n */\n\n/* globals document, DOMParser */\n\nimport BasicHtmlWriter from './basichtmlwriter';\nimport DomConverter from '../view/domconverter';\nimport { NBSP_FILLER } from '../view/filler';\n\n/**\n * The HTML data processor class.\n * This data processor implementation uses HTML as input and output data.\n *\n * @implements module:engine/dataprocessor/dataprocessor~DataProcessor\n */\nexport default class HtmlDataProcessor {\n\t/**\n\t * Creates a new instance of the HTML data processor class.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * A DOM parser instance used to parse an HTML string to an HTML document.\n\t\t *\n\t\t * @private\n\t\t * @member {DOMParser}\n\t\t */\n\t\tthis._domParser = new DOMParser();\n\n\t\t/**\n\t\t * A DOM converter used to convert DOM elements to view elements.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis._domConverter = new DomConverter( { blockFiller: NBSP_FILLER } );\n\n\t\t/**\n\t\t * A basic HTML writer instance used to convert DOM elements to an HTML string.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/dataprocessor/basichtmlwriter~BasicHtmlWriter}\n\t\t */\n\t\tthis._htmlWriter = new BasicHtmlWriter();\n\t}\n\n\t/**\n\t * Converts a provided {@link module:engine/view/documentfragment~DocumentFragment document fragment}\n\t * to data format &mdash; in this case to an HTML string.\n\t *\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment\n\t * @returns {String} HTML string.\n\t */\n\ttoData( viewFragment ) {\n\t\t// Convert view DocumentFragment to DOM DocumentFragment.\n\t\tconst domFragment = this._domConverter.viewToDom( viewFragment, document );\n\n\t\t// Convert DOM DocumentFragment to HTML output.\n\t\treturn this._htmlWriter.getHtml( domFragment );\n\t}\n\n\t/**\n\t * Converts the provided HTML string to a view tree.\n\t *\n\t * @param {String} data An HTML string.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} A converted view element.\n\t */\n\ttoView( data ) {\n\t\t// Convert input HTML data to DOM DocumentFragment.\n\t\tconst domFragment = this._toDom( data );\n\n\t\t// Convert DOM DocumentFragment to view DocumentFragment.\n\t\treturn this._domConverter.domToView( domFragment );\n\t}\n\n\t/**\n\t * Converts an HTML string to its DOM representation. Returns a document fragment containing nodes parsed from\n\t * the provided data.\n\t *\n\t * @private\n\t * @param {String} data\n\t * @returns {DocumentFragment}\n\t */\n\t_toDom( data ) {\n\t\tconst document = this._domParser.parseFromString( data, 'text/html' );\n\t\tconst fragment = document.createDocumentFragment();\n\t\tconst nodes = document.body.childNodes;\n\n\t\twhile ( nodes.length > 0 ) {\n\t\t\tfragment.appendChild( nodes[ 0 ] );\n\t\t}\n\n\t\treturn fragment;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/componentfactory\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * A helper class implementing the UI component ({@link module:ui/view~View view}) factory.\n *\n * It allows functions producing specific UI components to be registered under their unique names\n * in the factory. A registered component can be then instantiated by providing its name.\n * Note that names are case insensitive.\n *\n *\t\t// The editor provides localization tools for the factory.\n *\t\tconst factory = new ComponentFactory( editor );\n *\n *\t\tfactory.add( 'foo', locale => new FooView( locale ) );\n *\t\tfactory.add( 'bar', locale => new BarView( locale ) );\n *\n *\t\t// An instance of FooView.\n *\t\tconst fooInstance = factory.create( 'foo' );\n *\n *\t\t// Names are case insensitive so this is also allowed:\n *\t\tconst barInstance = factory.create( 'Bar' );\n *\n * The {@link module:core/editor/editor~Editor#locale editor locale} is passed to the factory\n * function when {@link module:ui/componentfactory~ComponentFactory#create} is called.\n */\nexport default class ComponentFactory {\n\t/**\n\t * Creates an instance of the factory.\n\t *\n\t * @constructor\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor instance that the factory belongs to.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * Registered component factories.\n\t\t *\n\t\t * @private\n\t\t * @member {Map}\n\t\t */\n\t\tthis._components = new Map();\n\t}\n\n\t/**\n\t * Returns an iterator of registered component names. Names are returned in lower case.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\t* names() {\n\t\tfor ( const value of this._components.values() ) {\n\t\t\tyield value.originalName;\n\t\t}\n\t}\n\n\t/**\n\t * Registers a component factory function that will be used by the\n\t * {@link #create create} method and called with the\n\t * {@link module:core/editor/editor~Editor#locale editor locale} as an argument,\n\t * allowing localization of the {@link module:ui/view~View view}.\n\t *\n\t * @param {String} name The name of the component.\n\t * @param {Function} callback The callback that returns the component.\n\t */\n\tadd( name, callback ) {\n\t\tif ( this.has( name ) ) {\n\t\t\t/**\n\t\t\t * The item already exists in the component factory.\n\t\t\t *\n\t\t\t * @error componentfactory-item-exists\n\t\t\t * @param {String} name The name of the component.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'componentfactory-item-exists: The item already exists in the component factory.', { name }\n\t\t\t);\n\t\t}\n\n\t\tthis._components.set( getNormalized( name ), { callback, originalName: name } );\n\t}\n\n\t/**\n\t * Creates an instance of a component registered in the factory under a specific name.\n\t *\n\t * When called, the {@link module:core/editor/editor~Editor#locale editor locale} is passed to\n\t * the previously {@link #add added} factory function, allowing localization of the\n\t * {@link module:ui/view~View view}.\n\t *\n\t * @param {String} name The name of the component.\n\t * @returns {module:ui/view~View} The instantiated component view.\n\t */\n\tcreate( name ) {\n\t\tif ( !this.has( name ) ) {\n\t\t\t/**\n\t\t\t * The required component is not registered in the component factory. Please make sure\n\t\t\t * the provided name is correct and the component has been correctly\n\t\t\t * {@link #add added} to the factory.\n\t\t\t *\n\t\t\t * @error componentfactory-item-missing\n\t\t\t * @param {String} name The name of the missing component.\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'componentfactory-item-missing: The required component is not registered in the factory.', { name }\n\t\t\t);\n\t\t}\n\n\t\treturn this._components.get( getNormalized( name ) ).callback( this.editor.locale );\n\t}\n\n\t/**\n\t * Checks if a component of a given name is registered in the factory.\n\t *\n\t * @param {String} name The name of the component.\n\t * @returns {Boolean}\n\t */\n\thas( name ) {\n\t\treturn this._components.has( getNormalized( name ) );\n\t}\n}\n\n//\n// Ensures that the component name used as the key in the internal map is in lower case.\n//\n// @private\n// @param {String} name\n// @returns {String}\nfunction getNormalized( name ) {\n\treturn String( name ).toLowerCase();\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* global setTimeout, clearTimeout */\n\n/**\n * @module utils/focustracker\n */\n\nimport DomEmitterMixin from './dom/emittermixin';\nimport ObservableMixin from './observablemixin';\nimport CKEditorError from './ckeditorerror';\nimport mix from './mix';\n\n/**\n * Allows observing a group of `HTMLElement`s whether at least one of them is focused.\n *\n * Used by the {@link module:core/editor/editor~Editor} in order to track whether the focus is still within the application,\n * or were used outside of its UI.\n *\n * **Note** `focus` and `blur` listeners use event capturing, so it is only needed to register wrapper `HTMLElement`\n * which contain other `focusable` elements. But note that this wrapper element has to be focusable too\n * (have e.g. `tabindex=\"-1\"`).\n *\n * @mixes module:utils/dom/emittermixin~EmitterMixin\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class FocusTracker {\n\tconstructor() {\n\t\t/**\n\t\t * True when one of the registered elements is focused.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * Currently focused element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis.focusedElement = null;\n\n\t\t/**\n\t\t * List of registered elements.\n\t\t *\n\t\t * @private\n\t\t * @member {Set.<HTMLElement>}\n\t\t */\n\t\tthis._elements = new Set();\n\n\t\t/**\n\t\t * Event loop timeout.\n\t\t *\n\t\t * @private\n\t\t * @member {Number}\n\t\t */\n\t\tthis._nextEventLoopTimeout = null;\n\t}\n\n\t/**\n\t * Starts tracking the specified element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tadd( element ) {\n\t\tif ( this._elements.has( element ) ) {\n\t\t\tthrow new CKEditorError( 'focusTracker-add-element-already-exist' );\n\t\t}\n\n\t\tthis.listenTo( element, 'focus', () => this._focus( element ), { useCapture: true } );\n\t\tthis.listenTo( element, 'blur', () => this._blur(), { useCapture: true } );\n\t\tthis._elements.add( element );\n\t}\n\n\t/**\n\t * Stops tracking the specified element and stops listening on this element.\n\t *\n\t * @param {HTMLElement} element\n\t */\n\tremove( element ) {\n\t\tif ( element === this.focusedElement ) {\n\t\t\tthis._blur( element );\n\t\t}\n\n\t\tif ( this._elements.has( element ) ) {\n\t\t\tthis.stopListening( element );\n\t\t\tthis._elements.delete( element );\n\t\t}\n\t}\n\n\t/**\n\t * Stores currently focused element and set {#isFocused} as `true`.\n\t *\n\t * @private\n\t * @param {HTMLElement} element Element which has been focused.\n\t */\n\t_focus( element ) {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis.focusedElement = element;\n\t\tthis.isFocused = true;\n\t}\n\n\t/**\n\t * Clears currently focused element and set {@link #isFocused} as `false`.\n\t * This method uses `setTimeout` to change order of fires `blur` and `focus` events.\n\t *\n\t * @private\n\t * @fires blur\n\t */\n\t_blur() {\n\t\tclearTimeout( this._nextEventLoopTimeout );\n\n\t\tthis._nextEventLoopTimeout = setTimeout( () => {\n\t\t\tthis.focusedElement = null;\n\t\t\tthis.isFocused = false;\n\t\t}, 0 );\n\t}\n\n\t/**\n\t * @event focus\n\t */\n\n\t/**\n\t * @event blur\n\t */\n}\n\nmix( FocusTracker, DomEmitterMixin );\nmix( FocusTracker, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/editor/editorui\n */\n\nimport ComponentFactory from '@ckeditor/ckeditor5-ui/src/componentfactory';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * A class providing the minimal interface that is required to successfully bootstrap any editor UI.\n *\n * @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class EditorUI {\n\t/**\n\t * Creates an instance of the editor UI class.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {module:ui/editorui/editoruiview~EditorUIView} view The view of the UI.\n\t */\n\tconstructor( editor, view ) {\n\t\t/**\n\t\t * The editor that the UI belongs to.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * The main (top–most) view of the editor UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/editorui/editoruiview~EditorUIView} #view\n\t\t */\n\t\tthis.view = view;\n\n\t\t/**\n\t\t * An instance of the {@link module:ui/componentfactory~ComponentFactory}, a registry used by plugins\n\t\t * to register factories of specific UI components.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/componentfactory~ComponentFactory} #componentFactory\n\t\t */\n\t\tthis.componentFactory = new ComponentFactory( editor );\n\n\t\t/**\n\t\t * Stores the information about the editor UI focus and propagates it so various plugins and components\n\t\t * are unified as a focus group.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker} #focusTracker\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t// Informs UI components that should be refreshed after layout change.\n\t\tthis.listenTo( editor.editing.view.document, 'layoutChanged', () => this.update() );\n\t}\n\n\t/**\n\t * Fires the {@link module:core/editor/editorui~EditorUI#event:update `update`} event.\n\t *\n\t * This method should be called when the editor UI (e.g. positions of its balloons) needs to be updated due to\n\t * some environmental change which CKEditor 5 is not aware of (e.g. resize of a container in which it is used).\n\t */\n\tupdate() {\n\t\tthis.fire( 'update' );\n\t}\n\n\t/**\n\t * Destroys the UI.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t\tthis.view.destroy();\n\t}\n\n\t/**\n\t * Fired whenever the UI (all related components) should be refreshed.\n\t *\n\t * **Note:**: The event is fired after each {@link module:engine/view/document~Document#event:layoutChanged}.\n\t * It can also be fired manually via the {@link module:core/editor/editorui~EditorUI#update} method.\n\t *\n\t * @event update\n\t */\n}\n\nmix( EditorUI, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module editor-classic/classiceditorui\n */\n\nimport EditorUI from '@ckeditor/ckeditor5-core/src/editor/editorui';\nimport enableToolbarKeyboardFocus from '@ckeditor/ckeditor5-ui/src/toolbar/enabletoolbarkeyboardfocus';\nimport normalizeToolbarConfig from '@ckeditor/ckeditor5-ui/src/toolbar/normalizetoolbarconfig';\n\n/**\n * The classic editor UI class.\n *\n * @extends module:core/editor/editorui~EditorUI\n */\nexport default class ClassicEditorUI extends EditorUI {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor, view ) {\n\t\tsuper( editor, view );\n\n\t\t/**\n\t\t * A normalized `config.toolbar` object.\n\t\t *\n\t\t * @type {Object}\n\t\t * @private\n\t\t */\n\t\tthis._toolbarConfig = normalizeToolbarConfig( editor.config.get( 'toolbar' ) );\n\t}\n\n\t/**\n\t * Initializes the UI.\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = this.view;\n\n\t\tview.render();\n\n\t\t// Set–up the sticky panel with toolbar.\n\t\tview.stickyPanel.bind( 'isActive' ).to( this.focusTracker, 'isFocused' );\n\t\tview.stickyPanel.limiterElement = view.element;\n\n\t\tif ( this._toolbarConfig.viewportTopOffset ) {\n\t\t\tview.stickyPanel.viewportTopOffset = this._toolbarConfig.viewportTopOffset;\n\t\t}\n\n\t\t// Setup the editable.\n\t\tconst editingRoot = editor.editing.view.document.getRoot();\n\t\tview.editable.bind( 'isReadOnly' ).to( editingRoot );\n\t\tview.editable.bind( 'isFocused' ).to( editor.editing.view.document );\n\t\tview.editable.name = editingRoot.rootName;\n\n\t\tthis.focusTracker.add( this.view.editableElement );\n\n\t\tthis.view.toolbar.fillFromConfig( this._toolbarConfig.items, this.componentFactory );\n\n\t\tenableToolbarKeyboardFocus( {\n\t\t\torigin: editor.editing.view,\n\t\t\toriginFocusTracker: this.focusTracker,\n\t\t\toriginKeystrokeHandler: editor.keystrokes,\n\t\t\ttoolbar: this.view.toolbar\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/toolbar/normalizetoolbarconfig\n */\n\n/**\n * Normalizes the toolbar configuration (`config.toolbar`), which:\n *\n * * may be defined as an `Array`:\n *\n * \t\ttoolbar: [ 'heading', 'bold', 'italic', 'link', ... ]\n *\n * * or an `Object`:\n *\n *\t\ttoolbar: {\n *\t\t\titems: [ 'heading', 'bold', 'italic', 'link', ... ],\n *\t\t\t...\n *\t\t}\n *\n * * or may not be defined at all (`undefined`)\n *\n * and returns it in the object form.\n *\n * @param {Array|Object|undefined} config The value of `config.toolbar`.\n * @returns {Object} A normalized toolbar config object.\n */\nexport default function normalizeToolbarConfig( config ) {\n\tif ( Array.isArray( config ) ) {\n\t\treturn {\n\t\t\titems: config\n\t\t};\n\t}\n\n\tif ( !config ) {\n\t\treturn {\n\t\t\titems: []\n\t\t};\n\t}\n\n\treturn Object.assign( {\n\t\titems: []\n\t}, config );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/toolbar/enabletoolbarkeyboardfocus\n */\n\n/**\n * Enables focus/blur toolbar navigation using `Alt+F10` and `Esc` keystrokes.\n *\n * @param {Object} options Options of the utility.\n * @param {*} options.origin A view to which the focus will return when `Esc` is pressed and\n * `options.toolbar` is focused.\n * @param {module:utils/keystrokehandler~KeystrokeHandler} options.originKeystrokeHandler A keystroke\n * handler to register `Alt+F10` keystroke.\n * @param {module:utils/focustracker~FocusTracker} options.originFocusTracker A focus tracker\n * for `options.origin`.\n * @param {module:ui/toolbar/toolbarview~ToolbarView} options.toolbar A toolbar which is to gain\n * focus when `Alt+F10` is pressed.\n * @param {Function} [options.beforeFocus] A callback executed before the `options.toolbar` gains focus\n * upon the `Alt+F10` keystroke.\n * @param {Function} [options.afterBlur] A callback executed after `options.toolbar` loses focus upon\n * `Esc` keystroke but before the focus goes back to `options.origin`.\n */\nexport default function enableToolbarKeyboardFocus( {\n\torigin,\n\toriginKeystrokeHandler,\n\toriginFocusTracker,\n\ttoolbar,\n\tbeforeFocus,\n\tafterBlur\n} ) {\n\t// Because toolbar items can get focus, the overall state of the toolbar must\n\t// also be tracked.\n\toriginFocusTracker.add( toolbar.element );\n\n\t// Focus the toolbar on the keystroke, if not already focused.\n\toriginKeystrokeHandler.set( 'Alt+F10', ( data, cancel ) => {\n\t\tif ( originFocusTracker.isFocused && !toolbar.focusTracker.isFocused ) {\n\t\t\tif ( beforeFocus ) {\n\t\t\t\tbeforeFocus();\n\t\t\t}\n\n\t\t\ttoolbar.focus();\n\n\t\t\tcancel();\n\t\t}\n\t} );\n\n\t// Blur the toolbar and bring the focus back to origin.\n\ttoolbar.keystrokes.set( 'Esc', ( data, cancel ) => {\n\t\tif ( toolbar.focusTracker.isFocused ) {\n\t\t\torigin.focus();\n\n\t\t\tif ( afterBlur ) {\n\t\t\t\tafterBlur();\n\t\t\t}\n\n\t\t\tcancel();\n\t\t}\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/viewcollection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Collects {@link module:ui/view~View} instances.\n *\n *\t\tconst parentView = new ParentView( locale );\n *\t\tconst collection = new ViewCollection( locale );\n *\n *\t\tcollection.setParent( parentView.element );\n *\n *\t\tconst viewA = new ChildView( locale );\n *\t\tconst viewB = new ChildView( locale );\n *\n * View collection renders and manages view {@link module:ui/view~View#element elements}:\n *\n *\t\tcollection.add( viewA );\n *\t\tcollection.add( viewB );\n *\n *\t\tconsole.log( parentView.element.firsChild ); // -> viewA.element\n *\t\tconsole.log( parentView.element.lastChild ); // -> viewB.element\n *\n * It {@link module:ui/viewcollection~ViewCollection#delegate propagates} DOM events too:\n *\n *\t\t// Delegate #click and #keydown events from viewA and viewB to the parentView.\n *\t\tcollection.delegate( 'click' ).to( parentView );\n *\n *\t\tparentView.on( 'click', ( evt ) => {\n *\t\t\tconsole.log( `${ evt.source } has been clicked.` );\n *\t\t} );\n *\n *\t\t// This event will be delegated to the parentView.\n *\t\tviewB.fire( 'click' );\n *\n * **Note**: A view collection can be used directly in the {@link module:ui/template~TemplateDefinition definition}\n * of a {@link module:ui/template~Template template}.\n *\n * @extends module:utils/collection~Collection\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class ViewCollection extends Collection {\n\t/**\n\t * Creates a new instance of the {@link module:ui/viewcollection~ViewCollection}.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The {@link module:core/editor/editor~Editor editor's locale} instance.\n\t */\n\tconstructor( locale ) {\n\t\tsuper( {\n\t\t\t// An #id Number attribute should be legal and not break the `ViewCollection` instance.\n\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/93\n\t\t\tidProperty: 'viewUid'\n\t\t} );\n\n\t\t// Handle {@link module:ui/view~View#element} in DOM when a new view is added to the collection.\n\t\tthis.on( 'add', ( evt, view, index ) => {\n\t\t\tif ( !view.isRendered ) {\n\t\t\t\tview.render();\n\t\t\t}\n\n\t\t\tif ( view.element && this._parentElement ) {\n\t\t\t\tthis._parentElement.insertBefore( view.element, this._parentElement.children[ index ] );\n\t\t\t}\n\t\t} );\n\n\t\t// Handle {@link module:ui/view~View#element} in DOM when a view is removed from the collection.\n\t\tthis.on( 'remove', ( evt, view ) => {\n\t\t\tif ( view.element && this._parentElement ) {\n\t\t\t\tview.element.remove();\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * The {@link module:core/editor/editor~Editor#locale editor's locale} instance.\n\t\t * See the view {@link module:ui/view~View#locale locale} property.\n\t\t *\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = locale;\n\n\t\t/**\n\t\t * A parent element within which child views are rendered and managed in DOM.\n\t\t *\n\t\t * @protected\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis._parentElement = null;\n\t}\n\n\t/**\n\t * Destroys the view collection along with child views.\n\t * See the view {@link module:ui/view~View#destroy} method.\n\t */\n\tdestroy() {\n\t\tthis.map( view => view.destroy() );\n\t}\n\n\t/**\n\t * Sets the parent HTML element of this collection. When parent is set, {@link #add adding} and\n\t * {@link #remove removing} views in the collection synchronizes their\n\t * {@link module:ui/view~View#element elements} in the parent element.\n\t *\n\t * @param {HTMLElement} element A new parent element.\n\t */\n\tsetParent( elementOrDocFragment ) {\n\t\tthis._parentElement = elementOrDocFragment;\n\t}\n\n\t/**\n\t * Delegates selected events coming from within views in the collection to any\n\t * {@link module:utils/emittermixin~Emitter}.\n\t *\n\t * For the following views and collection:\n\t *\n\t *\t\tconst viewA = new View();\n\t *\t\tconst viewB = new View();\n\t *\t\tconst viewC = new View();\n\t *\n\t *\t\tconst views = parentView.createCollection();\n\t *\n\t *\t\tviews.delegate( 'eventX' ).to( viewB );\n\t *\t\tviews.delegate( 'eventX', 'eventY' ).to( viewC );\n\t *\n\t *\t\tviews.add( viewA );\n\t *\n\t * the `eventX` is delegated (fired by) `viewB` and `viewC` along with `customData`:\n\t *\n\t *\t\tviewA.fire( 'eventX', customData );\n\t *\n\t * and `eventY` is delegated (fired by) `viewC` along with `customData`:\n\t *\n\t *\t\tviewA.fire( 'eventY', customData );\n\t *\n\t * See {@link module:utils/emittermixin~EmitterMixin#delegate}.\n\t *\n\t * @param {...String} events {@link module:ui/view~View} event names to be delegated to another\n\t * {@link module:utils/emittermixin~Emitter}.\n\t * @returns {Object}\n\t * @returns {Function} return.to A function which accepts the destination of\n\t * {@link module:utils/emittermixin~EmitterMixin#delegate delegated} events.\n\t */\n\tdelegate( ...events ) {\n\t\tif ( !events.length || !isStringArray( events ) ) {\n\t\t\t/**\n\t\t\t * All event names must be strings.\n\t\t\t *\n\t\t\t * @error ui-viewcollection-delegate-wrong-events\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'ui-viewcollection-delegate-wrong-events: All event names must be strings.' );\n\t\t}\n\n\t\treturn {\n\t\t\t/**\n\t\t\t * Selects destination for {@link module:utils/emittermixin~EmitterMixin#delegate} events.\n\t\t\t *\n\t\t\t * @memberOf module:ui/viewcollection~ViewCollection#delegate\n\t\t\t * @function module:ui/viewcollection~ViewCollection#delegate.to\n\t\t\t * @param {module:utils/emittermixin~EmitterMixin} dest An `EmitterMixin` instance which is\n\t\t\t * the destination for delegated events.\n\t\t\t */\n\t\t\tto: dest => {\n\t\t\t\t// Activate delegating on existing views in this collection.\n\t\t\t\tfor ( const view of this ) {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.delegate( evtName ).to( dest );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Activate delegating on future views in this collection.\n\t\t\t\tthis.on( 'add', ( evt, view ) => {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.delegate( evtName ).to( dest );\n\t\t\t\t\t}\n\t\t\t\t} );\n\n\t\t\t\t// Deactivate delegating when view is removed from this collection.\n\t\t\t\tthis.on( 'remove', ( evt, view ) => {\n\t\t\t\t\tfor ( const evtName of events ) {\n\t\t\t\t\t\tview.stopDelegating( evtName, dest );\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Removes a child view from the collection. If the {@link #setParent parent element} of the\n\t * collection has been set, the {@link module:ui/view~View#element element} of the view is also removed\n\t * in DOM, reflecting the order of the collection.\n\t *\n\t * See the {@link #add} method.\n\t *\n\t * @method #remove\n\t * @param {module:ui/view~View|Number|String} subject The view to remove, its id or index in the collection.\n\t * @returns {Object} The removed view.\n\t */\n}\n\nmix( Collection, ObservableMixin );\n\n// Check if all entries of the array are of `String` type.\n//\n// @private\n// @param {Array} arr An array to be checked.\n// @returns {Boolean}\nfunction isStringArray( arr ) {\n\treturn arr.every( a => typeof a == 'string' );\n}\n","import baseClone from './_baseClone';\n\n/**\n * This method is like `_.cloneWith` except that it recursively clones `value`.\n *\n * @static\n * @memberOf _\n * @since 4.0.0\n * @category Lang\n * @param {*} value The value to recursively clone.\n * @param {Function} [customizer] The function to customize cloning.\n * @returns {*} Returns the deep cloned value.\n * @see _.cloneWith\n * @example\n *\n * function customizer(value) {\n *   if (_.isElement(value)) {\n *     return value.cloneNode(true);\n *   }\n * }\n *\n * var el = _.cloneDeepWith(document.body, customizer);\n *\n * console.log(el === document.body);\n * // => false\n * console.log(el.nodeName);\n * // => 'BODY'\n * console.log(el.childNodes.length);\n * // => 20\n */\nfunction cloneDeepWith(value, customizer) {\n  return baseClone(value, true, true, customizer);\n}\n\nexport default cloneDeepWith;\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/template\n */\n\n/* global document */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport View from './view';\nimport ViewCollection from './viewcollection';\nimport cloneDeepWith from '@ckeditor/ckeditor5-utils/src/lib/lodash/cloneDeepWith';\nimport isObject from '@ckeditor/ckeditor5-utils/src/lib/lodash/isObject';\nimport isNode from '@ckeditor/ckeditor5-utils/src/dom/isnode';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\n\nconst xhtmlNs = 'http://www.w3.org/1999/xhtml';\n\n/**\n * A basic Template class. It renders a DOM HTML element or text from a\n * {@link module:ui/template~TemplateDefinition definition} and supports element attributes, children,\n * bindings to {@link module:utils/observablemixin~Observable observables} and DOM event propagation.\n *\n * A simple template can look like this:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\tclass: 'foo',\n *\t\t\t\tstyle: {\n *\t\t\t\t\tbackgroundColor: 'yellow'\n *\t\t\t\t}\n *\t\t\t},\n *\t\t\ton: {\n *\t\t\t\tclick: bind.to( 'clicked' )\n *\t\t\t}\n *\t\t\tchildren: [\n *\t\t\t\t'A paragraph.'\n *\t\t\t]\n *\t\t} ).render();\n *\n * and it will render the following HTML element:\n *\n *\t\t<p class=\"foo\" style=\"background-color: yellow;\">A paragraph.</p>\n *\n * Additionally, the `observable` will always fire `clicked` upon clicking `<p>` in the DOM.\n *\n * See {@link module:ui/template~TemplateDefinition} to know more about templates and complex\n * template definitions.\n *\n* @mixes module:utils/emittermixin~EmitterMixin\n */\nexport default class Template {\n\t/**\n\t * Creates an instance of the {@link ~Template} class.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} def The definition of the template.\n\t */\n\tconstructor( def ) {\n\t\tObject.assign( this, normalize( clone( def ) ) );\n\n\t\t/**\n\t\t * Indicates whether this particular Template instance has been\n\t\t * {@link #render rendered}.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isRendered = false;\n\n\t\t/**\n\t\t * The tag (`tagName`) of this template, e.g. `div`. It also indicates that the template\n\t\t * renders to an HTML element.\n\t\t *\n\t\t * @member {String} #tag\n\t\t */\n\n\t\t/**\n\t\t * The text of the template. It also indicates that the template renders to a DOM text node.\n\t\t *\n\t\t * @member {Array.<String|module:ui/template~TemplateValueSchema>} #text\n\t\t */\n\n\t\t/**\n\t\t * The attributes of the template, e.g. `{ id: [ 'ck-id' ] }`, corresponding with\n\t\t * the attributes of an HTML element.\n\t\t *\n\t\t * **Note**: This property only makes sense when {@link #tag} is defined.\n\t\t *\n\t\t * @member {Object} #attributes\n\t\t */\n\n\t\t/**\n\t\t * The children of the template. They can be either:\n\t\t * * independent instances of {@link ~Template} (sub–templates),\n\t\t * * native DOM Nodes.\n\t\t *\n\t\t * **Note**: This property only makes sense when {@link #tag} is defined.\n\t\t *\n\t\t * @member {Array.<module:ui/template~Template|Node>} #children\n\t\t */\n\n\t\t/**\n\t\t * The DOM event listeners of the template.\n\t\t *\n\t\t * @member {Object} #eventListeners\n\t\t */\n\n\t\t/**\n\t\t * The data used by the {@link #revert} method to restore a node to its original state.\n\t\t *\n\t\t * See: {@link #apply}.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/template~RenderData}\n\t\t */\n\t\tthis._revertData = null;\n\t}\n\n\t/**\n\t * Renders a DOM Node (an HTML element or text) out of the template.\n\t *\n\t *\t\tconst domNode = new Template( { ... } ).render();\n\t *\n\t * See: {@link #apply}.\n\t *\n\t * @returns {HTMLElement|Text}\n\t */\n\trender() {\n\t\tconst node = this._renderNode( {\n\t\t\tintoFragment: true\n\t\t} );\n\n\t\tthis._isRendered = true;\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Applies the template to an existing DOM Node, either HTML element or text.\n\t *\n\t * **Note:** No new DOM nodes will be created. Applying extends\n\t * {@link module:ui/template~TemplateDefinition attributes} and\n\t * {@link module:ui/template~TemplateDefinition event listeners} only.\n\t *\n\t * **Note:** Existing `class` and `style` attributes are extended when a template\n\t * is applied to an HTML element, while other attributes and `textContent` are overridden.\n\t *\n\t * **Note:** The process of applying a template can be easily reverted using the\n\t * {@link module:ui/template~Template#revert} method.\n\t *\n\t *\t\tconst element = document.createElement( 'div' );\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\tattrs: {\n\t *\t\t\t\tid: 'first-div',\n\t *\t\t\t\tclass: bind.to( 'divClass' )\n\t *\t\t\t},\n\t *\t\t\ton: {\n\t *\t\t\t\tclick: bind( 'elementClicked' ) // Will be fired by the observable.\n\t *\t\t\t}\n\t *\t\t\tchildren: [\n\t *\t\t\t\t'Div text.'\n\t *\t\t\t]\n\t *\t\t} ).apply( element );\n\t *\n\t *\t\telement.outerHTML == \"<div id=\"first-div\" class=\"my-div\">Div text.</div>\"\n\t *\n\t * @see module:ui/template~Template#render\n\t * @see module:ui/template~Template#revert\n\t * @param {Node} node Root node for the template to apply.\n\t */\n\tapply( node ) {\n\t\tthis._revertData = getEmptyRevertData();\n\n\t\tthis._renderNode( {\n\t\t\tnode,\n\t\t\tisApplying: true,\n\t\t\trevertData: this._revertData\n\t\t} );\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Reverts a template {@link module:ui/template~Template#apply applied} to a DOM node.\n\t *\n\t * @param {Node} node The root node for the template to revert. In most of the cases, it is the\n\t * same node used by {@link module:ui/template~Template#apply}.\n\t */\n\trevert( node ) {\n\t\tif ( !this._revertData ) {\n\t\t\t/**\n\t\t\t * Attempting to revert a template which has not been applied yet.\n\t\t\t *\n\t\t\t * @error ui-template-revert-not-applied\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'ui-template-revert-not-applied: Attempting to revert a template which has not been applied yet.' );\n\t\t}\n\n\t\tthis._revertTemplateFromNode( node, this._revertData );\n\t}\n\n\t/**\n\t * Returns an iterator which traverses the template in search of {@link module:ui/view~View}\n\t * instances and returns them one by one.\n\t *\n\t *\t\tconst viewFoo = new View();\n\t *\t\tconst viewBar = new View();\n\t *\t\tconst viewBaz = new View();\n\t *\t\tconst template = new Template( {\n\t *\t\t\ttag: 'div',\n\t *\t\t\tchildren: [\n\t *\t\t\t\tviewFoo,\n\t *\t\t\t\t{\n\t *\t\t\t\t\ttag: 'div',\n\t *\t\t\t\t\tchildren: [\n\t *\t\t\t\t\t\tviewBar\n\t *\t\t\t\t\t]\n\t *\t\t\t\t},\n\t *\t\t\t\tviewBaz\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Logs: viewFoo, viewBar, viewBaz\n\t *\t\tfor ( const view of template.getViews() ) {\n\t *\t\t\tconsole.log( view );\n\t *\t\t}\n\t *\n\t * @returns {Iterable.<module:ui/view~View>}\n\t */\n\t* getViews() {\n\t\tfunction* search( def ) {\n\t\t\tif ( def.children ) {\n\t\t\t\tfor ( const child of def.children ) {\n\t\t\t\t\tif ( isView( child ) ) {\n\t\t\t\t\t\tyield child;\n\t\t\t\t\t} else if ( isTemplate( child ) ) {\n\t\t\t\t\t\tyield* search( child );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tyield* search( this );\n\t}\n\n\t/**\n\t * An entry point to the interface which binds DOM nodes to\n\t * {@link module:utils/observablemixin~Observable observables}.\n\t * There are two types of bindings:\n\t *\n\t * * HTML element attributes or text `textContent` synchronized with attributes of an\n\t * {@link module:utils/observablemixin~Observable}. Learn more about {@link module:ui/template~BindChain#to}\n\t * and {@link module:ui/template~BindChain#if}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\tattrs: {\n\t *\t\t\t\t// Binds the element \"class\" attribute to observable#classAttribute.\n\t *\t\t\t\tclass: bind.to( 'classAttribute' )\n\t *\t\t\t}\n\t *\t\t} ).render();\n\t *\n\t * * DOM events fired on HTML element propagated through\n\t * {@link module:utils/observablemixin~Observable}. Learn more about {@link module:ui/template~BindChain#to}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tnew Template( {\n\t *\t\t\ton: {\n\t *\t\t\t\t// Will be fired by the observable.\n\t *\t\t\t\tclick: bind( 'elementClicked' )\n\t *\t\t\t}\n\t *\t\t} ).render();\n\t *\n\t * Also see {@link module:ui/view~View#bindTemplate}.\n\t *\n\t * @param {module:utils/observablemixin~Observable} observable An observable which provides boundable attributes.\n\t * @param {module:utils/emittermixin~Emitter} emitter An emitter that listens to observable attribute\n\t * changes or DOM Events (depending on the kind of the binding). Usually, a {@link module:ui/view~View} instance.\n\t * @returns {module:ui/template~BindChain}\n\t */\n\tstatic bind( observable, emitter ) {\n\t\treturn {\n\t\t\tto( eventNameOrFunctionOrAttribute, callback ) {\n\t\t\t\treturn new TemplateToBinding( {\n\t\t\t\t\teventNameOrFunction: eventNameOrFunctionOrAttribute,\n\t\t\t\t\tattribute: eventNameOrFunctionOrAttribute,\n\t\t\t\t\tobservable, emitter, callback\n\t\t\t\t} );\n\t\t\t},\n\n\t\t\tif( attribute, valueIfTrue, callback ) {\n\t\t\t\treturn new TemplateIfBinding( {\n\t\t\t\t\tobservable, emitter, attribute, valueIfTrue, callback\n\t\t\t\t} );\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Extends an existing {@link module:ui/template~Template} instance with some additional content\n\t * from another {@link module:ui/template~TemplateDefinition}.\n\t *\n\t *\t\tconst bind = Template.bind( observable, emitter );\n\t *\n\t *\t\tconst template = new Template( {\n\t *\t\t\ttag: 'p',\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'a',\n\t *\t\t\t\tdata-x: bind.to( 'foo' )\n\t *\t\t\t},\n\t *\t\t\tchildren: [\n\t *\t\t\t\t{\n\t *\t\t\t\t\ttag: 'span',\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\tclass: 'b'\n\t *\t\t\t\t\t},\n\t *\t\t\t\t\tchildren: [\n\t *\t\t\t\t\t\t'Span'\n\t *\t\t\t\t\t]\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t } );\n\t *\n\t *\t\t// Instance-level extension.\n\t *\t\tTemplate.extend( template, {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'b',\n\t *\t\t\t\tdata-x: bind.to( 'bar' )\n\t *\t\t\t},\n\t *\t\t\tchildren: [\n\t *\t\t\t\t{\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\tclass: 'c'\n\t *\t\t\t\t\t}\n\t *\t\t\t\t}\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t *\t\t// Child extension.\n\t *\t\tTemplate.extend( template.children[ 0 ], {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: 'd'\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * the `outerHTML` of `template.render()` is:\n\t *\n\t *\t\t<p class=\"a b\" data-x=\"{ observable.foo } { observable.bar }\">\n\t *\t\t\t<span class=\"b c d\">Span</span>\n\t *\t\t</p>\n\t *\n\t * @param {module:ui/template~Template} template An existing template instance to be extended.\n\t * @param {module:ui/template~TemplateDefinition} def Additional definition to be applied to a template.\n\t */\n\tstatic extend( template, def ) {\n\t\tif ( template._isRendered ) {\n\t\t\t/**\n\t\t\t * Extending a template after rendering may not work as expected. To make sure\n\t\t\t * the {@link module:ui/template~Template.extend extending} works for an element,\n\t\t\t * make sure it happens before {@link #render} is called.\n\t\t\t *\n\t\t\t * @error template-extend-render\n\t\t\t */\n\t\t\tlog.warn( 'template-extend-render: Attempting to extend a template which has already been rendered.' );\n\t\t}\n\n\t\textendTemplate( template, normalize( clone( def ) ) );\n\t}\n\n\t/**\n\t * Renders a DOM Node (either an HTML element or text) out of the template.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderNode( data ) {\n\t\tlet isInvalid;\n\n\t\tif ( data.node ) {\n\t\t\t// When applying, a definition cannot have \"tag\" and \"text\" at the same time.\n\t\t\tisInvalid = this.tag && this.text;\n\t\t} else {\n\t\t\t// When rendering, a definition must have either \"tag\" or \"text\": XOR( this.tag, this.text ).\n\t\t\tisInvalid = this.tag ? this.text : !this.text;\n\t\t}\n\n\t\tif ( isInvalid ) {\n\t\t\t/**\n\t\t\t * Node definition cannot have the \"tag\" and \"text\" properties at the same time.\n\t\t\t * Node definition must have either \"tag\" or \"text\" when rendering a new Node.\n\t\t\t *\n\t\t\t * @error ui-template-wrong-syntax\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-template-wrong-syntax: Node definition must have either \"tag\" or \"text\" when rendering a new Node.'\n\t\t\t);\n\t\t}\n\n\t\tif ( this.text ) {\n\t\t\treturn this._renderText( data );\n\t\t} else {\n\t\t\treturn this._renderElement( data );\n\t\t}\n\t}\n\n\t/**\n\t * Renders an HTML element out of the template.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderElement( data ) {\n\t\tlet node = data.node;\n\n\t\tif ( !node ) {\n\t\t\tnode = data.node = document.createElementNS( this.ns || xhtmlNs, this.tag );\n\t\t}\n\n\t\tthis._renderAttributes( data );\n\t\tthis._renderElementChildren( data );\n\t\tthis._setUpListeners( data );\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Renders a text node out of {@link module:ui/template~Template#text}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderText( data ) {\n\t\tlet node = data.node;\n\n\t\t// Save the original textContent to revert it in #revert().\n\t\tif ( node ) {\n\t\t\tdata.revertData.text = node.textContent;\n\t\t} else {\n\t\t\tnode = data.node = document.createTextNode( '' );\n\t\t}\n\n\t\t// Check if this Text Node is bound to Observable. Cases:\n\t\t//\n\t\t//\t\ttext: [ Template.bind( ... ).to( ... ) ]\n\t\t//\n\t\t//\t\ttext: [\n\t\t//\t\t\t'foo',\n\t\t//\t\t\tTemplate.bind( ... ).to( ... ),\n\t\t//\t\t\t...\n\t\t//\t\t]\n\t\t//\n\t\tif ( hasTemplateBinding( this.text ) ) {\n\t\t\tthis._bindToObservable( {\n\t\t\t\tschema: this.text,\n\t\t\t\tupdater: getTextUpdater( node ),\n\t\t\t\tdata\n\t\t\t} );\n\t\t}\n\t\t// Simply set text. Cases:\n\t\t//\n\t\t//\t\ttext: [ 'all', 'are', 'static' ]\n\t\t//\n\t\t//\t\ttext: [ 'foo' ]\n\t\t//\n\t\telse {\n\t\t\tnode.textContent = this.text.join( '' );\n\t\t}\n\n\t\treturn node;\n\t}\n\n\t/**\n\t * Renders HTML element attributes out of {@link module:ui/template~Template#attributes}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderAttributes( data ) {\n\t\tlet attrName, attrValue, domAttrValue, attrNs;\n\n\t\tif ( !this.attributes ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst node = data.node;\n\t\tconst revertData = data.revertData;\n\n\t\tfor ( attrName in this.attributes ) {\n\t\t\t// Current attribute value in DOM.\n\t\t\tdomAttrValue = node.getAttribute( attrName );\n\n\t\t\t// The value to be set.\n\t\t\tattrValue = this.attributes[ attrName ];\n\n\t\t\t// Save revert data.\n\t\t\tif ( revertData ) {\n\t\t\t\trevertData.attributes[ attrName ] = domAttrValue;\n\t\t\t}\n\n\t\t\t// Detect custom namespace:\n\t\t\t//\n\t\t\t//\t\tclass: {\n\t\t\t//\t\t\tns: 'abc',\n\t\t\t//\t\t\tvalue: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tattrNs = ( isObject( attrValue[ 0 ] ) && attrValue[ 0 ].ns ) ? attrValue[ 0 ].ns : null;\n\n\t\t\t// Activate binding if one is found. Cases:\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\tTemplate.bind( ... ).to( ... )\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t'bar',\n\t\t\t//\t\t\tTemplate.bind( ... ).to( ... ),\n\t\t\t//\t\t\t'baz'\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\t//\t\tclass: {\n\t\t\t//\t\t\tns: 'abc',\n\t\t\t//\t\t\tvalue: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tif ( hasTemplateBinding( attrValue ) ) {\n\t\t\t\t// Normalize attributes with additional data like namespace:\n\t\t\t\t//\n\t\t\t\t//\t\tclass: {\n\t\t\t\t//\t\t\tns: 'abc',\n\t\t\t\t//\t\t\tvalue: [ ... ]\n\t\t\t\t//\t\t}\n\t\t\t\t//\n\t\t\t\tconst valueToBind = attrNs ? attrValue[ 0 ].value : attrValue;\n\n\t\t\t\t// Extend the original value of attributes like \"style\" and \"class\",\n\t\t\t\t// don't override them.\n\t\t\t\tif ( revertData && shouldExtend( attrName ) ) {\n\t\t\t\t\tvalueToBind.unshift( domAttrValue );\n\t\t\t\t}\n\n\t\t\t\tthis._bindToObservable( {\n\t\t\t\t\tschema: valueToBind,\n\t\t\t\t\tupdater: getAttributeUpdater( node, attrName, attrNs ),\n\t\t\t\t\tdata\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Style attribute could be an Object so it needs to be parsed in a specific way.\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\twidth: '100px',\n\t\t\t//\t\t\theight: Template.bind( ... ).to( ... )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\telse if ( attrName == 'style' && typeof attrValue[ 0 ] !== 'string' ) {\n\t\t\t\tthis._renderStyleAttribute( attrValue[ 0 ], data );\n\t\t\t}\n\n\t\t\t// Otherwise simply set the static attribute:\n\t\t\t//\n\t\t\t//\t\tclass: [ 'foo' ]\n\t\t\t//\n\t\t\t//\t\tclass: [ 'all', 'are', 'static' ]\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t{\n\t\t\t//\t\t\t\tns: 'abc',\n\t\t\t//\t\t\t\tvalue: [ 'foo' ]\n\t\t\t//\t\t\t}\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\telse {\n\t\t\t\t// Extend the original value of attributes like \"style\" and \"class\",\n\t\t\t\t// don't override them.\n\t\t\t\tif ( revertData && domAttrValue && shouldExtend( attrName ) ) {\n\t\t\t\t\tattrValue.unshift( domAttrValue );\n\t\t\t\t}\n\n\t\t\t\tattrValue = attrValue\n\t\t\t\t\t// Retrieve \"values\" from:\n\t\t\t\t\t//\n\t\t\t\t\t//\t\tclass: [\n\t\t\t\t\t//\t\t\t{\n\t\t\t\t\t//\t\t\t\tns: 'abc',\n\t\t\t\t\t//\t\t\t\tvalue: [ ... ]\n\t\t\t\t\t//\t\t\t}\n\t\t\t\t\t//\t\t]\n\t\t\t\t\t//\n\t\t\t\t\t.map( val => val ? ( val.value || val ) : val )\n\t\t\t\t\t// Flatten the array.\n\t\t\t\t\t.reduce( ( prev, next ) => prev.concat( next ), [] )\n\t\t\t\t\t// Convert into string.\n\t\t\t\t\t.reduce( arrayValueReducer, '' );\n\n\t\t\t\tif ( !isFalsy( attrValue ) ) {\n\t\t\t\t\tnode.setAttributeNS( attrNs, attrName, attrValue );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Renders the `style` attribute of an HTML element based on\n\t * {@link module:ui/template~Template#attributes}.\n\t *\n\t * A style attribute is an {Object} with static values:\n\t *\n\t *\t\tattributes: {\n\t *\t\t\tstyle: {\n\t *\t\t\t\tcolor: 'red'\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * or values bound to {@link module:ui/model~Model} properties:\n\t *\n\t *\t\tattributes: {\n\t *\t\t\tstyle: {\n\t *\t\t\t\tcolor: bind.to( ... )\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * Note: The `style` attribute is rendered without setting the namespace. It does not seem to be\n\t * needed.\n\t *\n\t * @private\n\t * @param {Object} styles Styles located in `attributes.style` of {@link module:ui/template~TemplateDefinition}.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderStyleAttribute( styles, data ) {\n\t\tconst node = data.node;\n\n\t\tfor ( const styleName in styles ) {\n\t\t\tconst styleValue = styles[ styleName ];\n\n\t\t\t// Cases:\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\tcolor: bind.to( 'attribute' )\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\tif ( hasTemplateBinding( styleValue ) ) {\n\t\t\t\tthis._bindToObservable( {\n\t\t\t\t\tschema: [ styleValue ],\n\t\t\t\t\tupdater: getStyleUpdater( node, styleName ),\n\t\t\t\t\tdata\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\t// Cases:\n\t\t\t//\n\t\t\t//\t\tstyle: {\n\t\t\t//\t\t\tcolor: 'red'\n\t\t\t//\t\t}\n\t\t\t//\n\t\t\telse {\n\t\t\t\tnode.style[ styleName ] = styleValue;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Recursively renders HTML element's children from {@link module:ui/template~Template#children}.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_renderElementChildren( data ) {\n\t\tconst node = data.node;\n\t\tconst container = data.intoFragment ? document.createDocumentFragment() : node;\n\t\tconst isApplying = data.isApplying;\n\t\tlet childIndex = 0;\n\n\t\tfor ( const child of this.children ) {\n\t\t\tif ( isViewCollection( child ) ) {\n\t\t\t\tif ( !isApplying ) {\n\t\t\t\t\tchild.setParent( node );\n\n\t\t\t\t\t// Note: ViewCollection renders its children.\n\t\t\t\t\tfor ( const view of child ) {\n\t\t\t\t\t\tcontainer.appendChild( view.element );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t} else if ( isView( child ) ) {\n\t\t\t\tif ( !isApplying ) {\n\t\t\t\t\tif ( !child.isRendered ) {\n\t\t\t\t\t\tchild.render();\n\t\t\t\t\t}\n\n\t\t\t\t\tcontainer.appendChild( child.element );\n\t\t\t\t}\n\t\t\t} else if ( isNode( child ) ) {\n\t\t\t\tcontainer.appendChild( child );\n\t\t\t} else {\n\t\t\t\tif ( isApplying ) {\n\t\t\t\t\tconst revertData = data.revertData;\n\t\t\t\t\tconst childRevertData = getEmptyRevertData();\n\n\t\t\t\t\trevertData.children.push( childRevertData );\n\n\t\t\t\t\tchild._renderNode( {\n\t\t\t\t\t\tnode: container.childNodes[ childIndex++ ],\n\t\t\t\t\t\tisApplying: true,\n\t\t\t\t\t\trevertData: childRevertData\n\t\t\t\t\t} );\n\t\t\t\t} else {\n\t\t\t\t\tcontainer.appendChild( child.render() );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tif ( data.intoFragment ) {\n\t\t\tnode.appendChild( container );\n\t\t}\n\t}\n\n\t/**\n\t * Activates `on` event listeners from the {@link module:ui/template~TemplateDefinition}\n\t * on an HTML element.\n\t *\n\t * @protected\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t */\n\t_setUpListeners( data ) {\n\t\tif ( !this.eventListeners ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const key in this.eventListeners ) {\n\t\t\tconst revertBindings = this.eventListeners[ key ].map( schemaItem => {\n\t\t\t\tconst [ domEvtName, domSelector ] = key.split( '@' );\n\n\t\t\t\treturn schemaItem.activateDomEventListener( domEvtName, domSelector, data );\n\t\t\t} );\n\n\t\t\tif ( data.revertData ) {\n\t\t\t\tdata.revertData.bindings.push( revertBindings );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * For a given {@link module:ui/template~TemplateValueSchema} containing {@link module:ui/template~TemplateBinding}\n\t * activates the binding and sets its initial value.\n\t *\n\t * Note: {@link module:ui/template~TemplateValueSchema} can be for HTML element attributes or\n\t * text node `textContent`.\n\t *\n\t * @protected\n\t * @param {Object} options Binding options.\n\t * @param {module:ui/template~TemplateValueSchema} options.schema\n\t * @param {Function} options.updater A function which updates the DOM (like attribute or text).\n\t * @param {module:ui/template~RenderData} options.data Rendering data.\n\t */\n\t_bindToObservable( { schema, updater, data } ) {\n\t\tconst revertData = data.revertData;\n\n\t\t// Set initial values.\n\t\tsyncValueSchemaValue( schema, updater, data );\n\n\t\tconst revertBindings = schema\n\t\t\t// Filter \"falsy\" (false, undefined, null, '') value schema components out.\n\t\t\t.filter( item => !isFalsy( item ) )\n\t\t\t// Filter inactive bindings from schema, like static strings ('foo'), numbers (42), etc.\n\t\t\t.filter( item => item.observable )\n\t\t\t// Once only the actual binding are left, let the emitter listen to observable change:attribute event.\n\t\t\t// TODO: Reduce the number of listeners attached as many bindings may listen\n\t\t\t// to the same observable attribute.\n\t\t\t.map( templateBinding => templateBinding.activateAttributeListener( schema, updater, data ) );\n\n\t\tif ( revertData ) {\n\t\t\trevertData.bindings.push( revertBindings );\n\t\t}\n\t}\n\n\t/**\n\t * Reverts {@link module:ui/template~RenderData#revertData template data} from a node to\n\t * return it to the original state.\n\t *\n\t * @protected\n\t * @param {HTMLElement|Text} node A node to be reverted.\n\t * @param {module:ui/template~RenderData#revertData} revertData Stores information about\n\t * what changes have been made by {@link #apply} to the node.\n\t */\n\t_revertTemplateFromNode( node, revertData ) {\n\t\tfor ( const binding of revertData.bindings ) {\n\t\t\t// Each binding may consist of several observable+observable#attribute.\n\t\t\t// like the following has 2:\n\t\t\t//\n\t\t\t//\t\tclass: [\n\t\t\t//\t\t\t'x',\n\t\t\t//\t\t\tbind.to( 'foo' ),\n\t\t\t//\t\t\t'y',\n\t\t\t//\t\t\tbind.to( 'bar' )\n\t\t\t//\t\t]\n\t\t\t//\n\t\t\tfor ( const revertBinding of binding ) {\n\t\t\t\trevertBinding();\n\t\t\t}\n\t\t}\n\n\t\tif ( revertData.text ) {\n\t\t\tnode.textContent = revertData.text;\n\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const attrName in revertData.attributes ) {\n\t\t\tconst attrValue = revertData.attributes[ attrName ];\n\n\t\t\t// When the attribute has **not** been set before #apply().\n\t\t\tif ( attrValue === null ) {\n\t\t\t\tnode.removeAttribute( attrName );\n\t\t\t} else {\n\t\t\t\tnode.setAttribute( attrName, attrValue );\n\t\t\t}\n\t\t}\n\n\t\tfor ( let i = 0; i < revertData.children.length; ++i ) {\n\t\t\tthis._revertTemplateFromNode( node.childNodes[ i ], revertData.children[ i ] );\n\t\t}\n\t}\n}\n\nmix( Template, EmitterMixin );\n\n/**\n * Describes a binding created by the {@link module:ui/template~Template.bind} interface.\n *\n * @protected\n */\nexport class TemplateBinding {\n\t/**\n\t * Creates an instance of the {@link module:ui/template~TemplateBinding} class.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} def The definition of the binding.\n\t */\n\tconstructor( def ) {\n\t\tObject.assign( this, def );\n\n\t\t/**\n\t\t * An observable instance of the binding. It either:\n\t\t *\n\t\t * * provides the attribute with the value,\n\t\t * * or passes the event when a corresponding DOM event is fired.\n\t\t *\n\t\t * @member {module:utils/observablemixin~ObservableMixin} module:ui/template~TemplateBinding#observable\n\t\t */\n\n\t\t/**\n\t\t * An {@link module:utils/emittermixin~Emitter} used by the binding to:\n\t\t *\n\t\t * * listen to the attribute change in the {@link module:ui/template~TemplateBinding#observable},\n\t\t * * or listen to the event in the DOM.\n\t\t *\n\t\t * @member {module:utils/emittermixin~EmitterMixin} module:ui/template~TemplateBinding#emitter\n\t\t */\n\n\t\t/**\n\t\t * The name of the {@link module:ui/template~TemplateBinding#observable observed attribute}.\n\t\t *\n\t\t * @member {String} module:ui/template~TemplateBinding#attribute\n\t\t */\n\n\t\t/**\n\t\t * A custom function to process the value of the {@link module:ui/template~TemplateBinding#attribute}.\n\t\t *\n\t\t * @member {Function} [module:ui/template~TemplateBinding#callback]\n\t\t */\n\t}\n\n\t/**\n\t * Returns the value of the binding. It is the value of the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}. The value may be processed by the\n\t * {@link module:ui/template~TemplateBinding#callback}, if such has been passed to the binding.\n\t *\n\t * @param {Node} [node] A native DOM node, passed to the custom {@link module:ui/template~TemplateBinding#callback}.\n\t * @returns {*} The value of {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}.\n\t */\n\tgetValue( node ) {\n\t\tconst value = this.observable[ this.attribute ];\n\n\t\treturn this.callback ? this.callback( value, node ) : value;\n\t}\n\n\t/**\n\t * Activates the listener which waits for changes of the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable}, then updates the DOM with the aggregated\n\t * value of {@link module:ui/template~TemplateValueSchema}.\n\t *\n\t * @param {module:ui/template~TemplateValueSchema} schema A full schema to generate an attribute or text in the DOM.\n\t * @param {Function} updater A DOM updater function used to update the native DOM attribute or text.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t * @returns {Function} A function to sever the listener binding.\n\t */\n\tactivateAttributeListener( schema, updater, data ) {\n\t\tconst callback = () => syncValueSchemaValue( schema, updater, data );\n\n\t\tthis.emitter.listenTo( this.observable, 'change:' + this.attribute, callback );\n\n\t\t// Allows revert of the listener.\n\t\treturn () => {\n\t\t\tthis.emitter.stopListening( this.observable, 'change:' + this.attribute, callback );\n\t\t};\n\t}\n}\n\n/**\n * Describes either:\n *\n * * a binding to an {@link module:utils/observablemixin~Observable},\n * * or a native DOM event binding.\n *\n * It is created by the {@link module:ui/template~BindChain#to} method.\n *\n * @protected\n */\nexport class TemplateToBinding extends TemplateBinding {\n\t/**\n\t * Activates the listener for the native DOM event, which when fired, is propagated by\n\t * the {@link module:ui/template~TemplateBinding#emitter}.\n\t *\n\t * @param {String} domEvtName The name of the native DOM event.\n\t * @param {String} domSelector The selector in the DOM to filter delegated events.\n\t * @param {module:ui/template~RenderData} data Rendering data.\n\t * @returns {Function} A function to sever the listener binding.\n\t */\n\tactivateDomEventListener( domEvtName, domSelector, data ) {\n\t\tconst callback = ( evt, domEvt ) => {\n\t\t\tif ( !domSelector || domEvt.target.matches( domSelector ) ) {\n\t\t\t\tif ( typeof this.eventNameOrFunction == 'function' ) {\n\t\t\t\t\tthis.eventNameOrFunction( domEvt );\n\t\t\t\t} else {\n\t\t\t\t\tthis.observable.fire( this.eventNameOrFunction, domEvt );\n\t\t\t\t}\n\t\t\t}\n\t\t};\n\n\t\tthis.emitter.listenTo( data.node, domEvtName, callback );\n\n\t\t// Allows revert of the listener.\n\t\treturn () => {\n\t\t\tthis.emitter.stopListening( data.node, domEvtName, callback );\n\t\t};\n\t}\n}\n\n/**\n * Describes a binding to {@link module:utils/observablemixin~ObservableMixin} created by the {@link module:ui/template~BindChain#if}\n * method.\n *\n * @protected\n */\nexport class TemplateIfBinding extends TemplateBinding {\n\t/**\n\t * @inheritDoc\n\t */\n\tgetValue( node ) {\n\t\tconst value = super.getValue( node );\n\n\t\treturn isFalsy( value ) ? false : ( this.valueIfTrue || true );\n\t}\n\n\t/**\n\t * The value of the DOM attribute or text to be set if the {@link module:ui/template~TemplateBinding#attribute} in\n\t * {@link module:ui/template~TemplateBinding#observable} is `true`.\n\t *\n\t * @member {String} [module:ui/template~TemplateIfBinding#valueIfTrue]\n\t */\n}\n\n// Checks whether given {@link module:ui/template~TemplateValueSchema} contains a\n// {@link module:ui/template~TemplateBinding}.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @returns {Boolean}\nfunction hasTemplateBinding( schema ) {\n\tif ( !schema ) {\n\t\treturn false;\n\t}\n\n\t// Normalize attributes with additional data like namespace:\n\t//\n\t//\t\tclass: {\n\t//\t\t\tns: 'abc',\n\t//\t\t\tvalue: [ ... ]\n\t//\t\t}\n\t//\n\tif ( schema.value ) {\n\t\tschema = schema.value;\n\t}\n\n\tif ( Array.isArray( schema ) ) {\n\t\treturn schema.some( hasTemplateBinding );\n\t} else if ( schema instanceof TemplateBinding ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n\n// Assembles the value using {@link module:ui/template~TemplateValueSchema} and stores it in a form of\n// an Array. Each entry of the Array corresponds to one of {@link module:ui/template~TemplateValueSchema}\n// items.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @param {Node} node DOM Node updated when {@link module:utils/observablemixin~ObservableMixin} changes.\n// @returns {Array}\nfunction getValueSchemaValue( schema, node ) {\n\treturn schema.map( schemaItem => {\n\t\t// Process {@link module:ui/template~TemplateBinding} bindings.\n\t\tif ( schemaItem instanceof TemplateBinding ) {\n\t\t\treturn schemaItem.getValue( node );\n\t\t}\n\n\t\t// All static values like strings, numbers, and \"falsy\" values (false, null, undefined, '', etc.) just pass.\n\t\treturn schemaItem;\n\t} );\n}\n\n// A function executed each time the bound Observable attribute changes, which updates the DOM with a value\n// constructed from {@link module:ui/template~TemplateValueSchema}.\n//\n// @param {module:ui/template~TemplateValueSchema} schema\n// @param {Function} updater A function which updates the DOM (like attribute or text).\n// @param {Node} node DOM Node updated when {@link module:utils/observablemixin~ObservableMixin} changes.\nfunction syncValueSchemaValue( schema, updater, { node } ) {\n\tlet value = getValueSchemaValue( schema, node );\n\n\t// Check if schema is a single Template.bind.if, like:\n\t//\n\t//\t\tclass: Template.bind.if( 'foo' )\n\t//\n\tif ( schema.length == 1 && schema[ 0 ] instanceof TemplateIfBinding ) {\n\t\tvalue = value[ 0 ];\n\t} else {\n\t\tvalue = value.reduce( arrayValueReducer, '' );\n\t}\n\n\tif ( isFalsy( value ) ) {\n\t\tupdater.remove();\n\t} else {\n\t\tupdater.set( value );\n\t}\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of DOM Node to set or reset `textContent`.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @returns {Object}\nfunction getTextUpdater( node ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tnode.textContent = value;\n\t\t},\n\n\t\tremove() {\n\t\t\tnode.textContent = '';\n\t\t}\n\t};\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of DOM Node to set or reset an attribute.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @param {String} attrName Name of the attribute to be modified.\n// @param {String} [ns=null] Namespace to use.\n// @returns {Object}\nfunction getAttributeUpdater( el, attrName, ns ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tel.setAttributeNS( ns, attrName, value );\n\t\t},\n\n\t\tremove() {\n\t\t\tel.removeAttributeNS( ns, attrName );\n\t\t}\n\t};\n}\n\n// Returns an object consisting of `set` and `remove` functions, which\n// can be used in the context of CSSStyleDeclaration to set or remove a style.\n// @see module:ui/view~View#_bindToObservable\n//\n// @param {Node} node DOM Node to be modified.\n// @param {String} styleName Name of the style to be modified.\n// @returns {Object}\nfunction getStyleUpdater( el, styleName ) {\n\treturn {\n\t\tset( value ) {\n\t\t\tel.style[ styleName ] = value;\n\t\t},\n\n\t\tremove() {\n\t\t\tel.style[ styleName ] = null;\n\t\t}\n\t};\n}\n\n// Clones definition of the template.\n//\n// @param {module:ui/template~TemplateDefinition} def\n// @returns {module:ui/template~TemplateDefinition}\nfunction clone( def ) {\n\tconst clone = cloneDeepWith( def, value => {\n\t\t// Don't clone the `Template.bind`* bindings because of the references to Observable\n\t\t// and DomEmitterMixin instances inside, which would also be traversed and cloned by greedy\n\t\t// cloneDeepWith algorithm. There's no point in cloning Observable/DomEmitterMixins\n\t\t// along with the definition.\n\t\t//\n\t\t// Don't clone Template instances if provided as a child. They're simply #render()ed\n\t\t// and nothing should interfere.\n\t\t//\n\t\t// Also don't clone View instances if provided as a child of the Template. The template\n\t\t// instance will be extracted from the View during the normalization and there's no need\n\t\t// to clone it.\n\t\tif ( value && ( value instanceof TemplateBinding || isTemplate( value ) || isView( value ) || isViewCollection( value ) ) ) {\n\t\t\treturn value;\n\t\t}\n\t} );\n\n\treturn clone;\n}\n\n// Normalizes given {@link module:ui/template~TemplateDefinition}.\n//\n// See:\n//  * {@link normalizeAttributes}\n//  * {@link normalizeListeners}\n//  * {@link normalizePlainTextDefinition}\n//  * {@link normalizeTextDefinition}\n//\n// @param {module:ui/template~TemplateDefinition} def\n// @returns {module:ui/template~TemplateDefinition} Normalized definition.\nfunction normalize( def ) {\n\tif ( typeof def == 'string' ) {\n\t\tdef = normalizePlainTextDefinition( def );\n\t} else if ( def.text ) {\n\t\tnormalizeTextDefinition( def );\n\t}\n\n\tif ( def.on ) {\n\t\tdef.eventListeners = normalizeListeners( def.on );\n\n\t\t// Template mixes EmitterMixin, so delete #on to avoid collision.\n\t\tdelete def.on;\n\t}\n\n\tif ( !def.text ) {\n\t\tif ( def.attributes ) {\n\t\t\tnormalizeAttributes( def.attributes );\n\t\t}\n\n\t\tconst children = [];\n\n\t\tif ( def.children ) {\n\t\t\tif ( isViewCollection( def.children ) ) {\n\t\t\t\tchildren.push( def.children );\n\t\t\t} else {\n\t\t\t\tfor ( const child of def.children ) {\n\t\t\t\t\tif ( isTemplate( child ) || isView( child ) || isNode( child ) ) {\n\t\t\t\t\t\tchildren.push( child );\n\t\t\t\t\t} else {\n\t\t\t\t\t\tchildren.push( new Template( child ) );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\tdef.children = children;\n\t}\n\n\treturn def;\n}\n\n// Normalizes \"attributes\" section of {@link module:ui/template~TemplateDefinition}.\n//\n//\t\tattributes: {\n//\t\t\ta: 'bar',\n//\t\t\tb: {@link module:ui/template~TemplateBinding},\n//\t\t\tc: {\n//\t\t\t\tvalue: 'bar'\n//\t\t\t}\n//\t\t}\n//\n// becomes\n//\n//\t\tattributes: {\n//\t\t\ta: [ 'bar' ],\n//\t\t\tb: [ {@link module:ui/template~TemplateBinding} ],\n//\t\t\tc: {\n//\t\t\t\tvalue: [ 'bar' ]\n//\t\t\t}\n//\t\t}\n//\n// @param {Object} attrs\nfunction normalizeAttributes( attrs ) {\n\tfor ( const a in attrs ) {\n\t\tif ( attrs[ a ].value ) {\n\t\t\tattrs[ a ].value = [].concat( attrs[ a ].value );\n\t\t}\n\n\t\tarrayify( attrs, a );\n\t}\n}\n\n// Normalizes \"on\" section of {@link module:ui/template~TemplateDefinition}.\n//\n//\t\ton: {\n//\t\t\ta: 'bar',\n//\t\t\tb: {@link module:ui/template~TemplateBinding},\n//\t\t\tc: [ {@link module:ui/template~TemplateBinding}, () => { ... } ]\n//\t\t}\n//\n// becomes\n//\n//\t\ton: {\n//\t\t\ta: [ 'bar' ],\n//\t\t\tb: [ {@link module:ui/template~TemplateBinding} ],\n//\t\t\tc: [ {@link module:ui/template~TemplateBinding}, () => { ... } ]\n//\t\t}\n//\n// @param {Object} listeners\n// @returns {Object} Object containing normalized listeners.\nfunction normalizeListeners( listeners ) {\n\tfor ( const l in listeners ) {\n\t\tarrayify( listeners, l );\n\t}\n\n\treturn listeners;\n}\n\n// Normalizes \"string\" {@link module:ui/template~TemplateDefinition}.\n//\n//\t\t\"foo\"\n//\n// becomes\n//\n//\t\t{ text: [ 'foo' ] },\n//\n// @param {String} def\n// @returns {module:ui/template~TemplateDefinition} Normalized template definition.\nfunction normalizePlainTextDefinition( def ) {\n\treturn {\n\t\ttext: [ def ]\n\t};\n}\n\n// Normalizes text {@link module:ui/template~TemplateDefinition}.\n//\n//\t\tchildren: [\n//\t\t\t{ text: 'def' },\n//\t\t\t{ text: {@link module:ui/template~TemplateBinding} }\n//\t\t]\n//\n// becomes\n//\n//\t\tchildren: [\n//\t\t\t{ text: [ 'def' ] },\n//\t\t\t{ text: [ {@link module:ui/template~TemplateBinding} ] }\n//\t\t]\n//\n// @param {module:ui/template~TemplateDefinition} def\nfunction normalizeTextDefinition( def ) {\n\tif ( !Array.isArray( def.text ) ) {\n\t\tdef.text = [ def.text ];\n\t}\n}\n\n// Wraps an entry in Object in an Array, if not already one.\n//\n//\t\t{\n//\t\t\tx: 'y',\n//\t\t\ta: [ 'b' ]\n//\t\t}\n//\n// becomes\n//\n//\t\t{\n//\t\t\tx: [ 'y' ],\n//\t\t\ta: [ 'b' ]\n//\t\t}\n//\n// @param {Object} obj\n// @param {String} key\nfunction arrayify( obj, key ) {\n\tif ( !Array.isArray( obj[ key ] ) ) {\n\t\tobj[ key ] = [ obj[ key ] ];\n\t}\n}\n\n// A helper which concatenates the value avoiding unwanted\n// leading white spaces.\n//\n// @param {String} prev\n// @param {String} cur\n// @returns {String}\nfunction arrayValueReducer( prev, cur ) {\n\tif ( isFalsy( cur ) ) {\n\t\treturn prev;\n\t} else if ( isFalsy( prev ) ) {\n\t\treturn cur;\n\t} else {\n\t\treturn `${ prev } ${ cur }`;\n\t}\n}\n\n// Extends one object defined in the following format:\n//\n//\t\t{\n//\t\t\tkey1: [Array1],\n//\t\t\tkey2: [Array2],\n//\t\t\t...\n//\t\t\tkeyN: [ArrayN]\n//\t\t}\n//\n// with another object of the same data format.\n//\n// @param {Object} obj Base object.\n// @param {Object} ext Object extending base.\n// @returns {String}\nfunction extendObjectValueArray( obj, ext ) {\n\tfor ( const a in ext ) {\n\t\tif ( obj[ a ] ) {\n\t\t\tobj[ a ].push( ...ext[ a ] );\n\t\t} else {\n\t\t\tobj[ a ] = ext[ a ];\n\t\t}\n\t}\n}\n\n// A helper for {@link module:ui/template~Template#extend}. Recursively extends {@link module:ui/template~Template} instance\n// with content from {module:ui/template~TemplateDefinition}. See {@link module:ui/template~Template#extend} to learn more.\n//\n// @param {module:ui/template~Template} def A template instance to be extended.\n// @param {module:ui/template~TemplateDefinition} def A definition which is to extend the template instance.\nfunction extendTemplate( template, def ) {\n\tif ( def.attributes ) {\n\t\tif ( !template.attributes ) {\n\t\t\ttemplate.attributes = {};\n\t\t}\n\n\t\textendObjectValueArray( template.attributes, def.attributes );\n\t}\n\n\tif ( def.eventListeners ) {\n\t\tif ( !template.eventListeners ) {\n\t\t\ttemplate.eventListeners = {};\n\t\t}\n\n\t\textendObjectValueArray( template.eventListeners, def.eventListeners );\n\t}\n\n\tif ( def.text ) {\n\t\ttemplate.text.push( ...def.text );\n\t}\n\n\tif ( def.children && def.children.length ) {\n\t\tif ( template.children.length != def.children.length ) {\n\t\t\t/**\n\t\t\t * The number of children in extended definition does not match.\n\t\t\t *\n\t\t\t * @error ui-template-extend-children-mismatch\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'ui-template-extend-children-mismatch: The number of children in extended definition does not match.'\n\t\t\t);\n\t\t}\n\n\t\tlet childIndex = 0;\n\n\t\tfor ( const childDef of def.children ) {\n\t\t\textendTemplate( template.children[ childIndex++ ], childDef );\n\t\t}\n\t}\n}\n\n// Checks if value is \"falsy\".\n// Note: 0 (Number) is not \"falsy\" in this context.\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isFalsy( value ) {\n\treturn !value && value !== 0;\n}\n\n// Checks if the item is an instance of {@link module:ui/view~View}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isView( item ) {\n\treturn item instanceof View;\n}\n\n// Checks if the item is an instance of {@link module:ui/template~Template}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isTemplate( item ) {\n\treturn item instanceof Template;\n}\n\n// Checks if the item is an instance of {@link module:ui/viewcollection~ViewCollection}\n//\n// @private\n// @param {*} value Value to be checked.\nfunction isViewCollection( item ) {\n\treturn item instanceof ViewCollection;\n}\n\n// Creates an empty skeleton for {@link module:ui/template~Template#revert}\n// data.\n//\n// @private\nfunction getEmptyRevertData() {\n\treturn {\n\t\tchildren: [],\n\t\tbindings: [],\n\t\tattributes: {}\n\t};\n}\n\n// Checks whether an attribute should be extended when\n// {@link module:ui/template~Template#apply} is called.\n//\n// @private\n// @param {String} attrName Attribute name to check.\nfunction shouldExtend( attrName ) {\n\treturn attrName == 'class' || attrName == 'style';\n}\n\n/**\n * A definition of the {@link module:ui/template~Template}. It describes what kind of\n * node a template will render (HTML element or text), attributes of an element, DOM event\n * listeners and children.\n *\n * Also see:\n * * {@link module:ui/template~TemplateValueSchema} to learn about HTML element attributes,\n * * {@link module:ui/template~TemplateListenerSchema} to learn about DOM event listeners.\n *\n * A sample definition on an HTML element can look like this:\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tchildren: [\n *\t\t\t\t{\n *\t\t\t\t\ttag: 'span',\n *\t\t\t\t\tattributes: { ... },\n *\t\t\t\t\tchildren: [ ... ],\n *\t\t\t\t},\n *\t\t\t\t{\n *\t\t\t\t\ttext: 'static–text'\n *\t\t\t\t},\n *\t\t\t\t'also-static–text',\n *\t\t\t],\n *\t\t\tattributes: {\n *\t\t\t\tclass: {@link module:ui/template~TemplateValueSchema},\n *\t\t\t\tid: {@link module:ui/template~TemplateValueSchema},\n *\t\t\t\tstyle: {@link module:ui/template~TemplateValueSchema}\n *\n *\t\t\t\t// ...\n *\t\t\t},\n *\t\t\ton: {\n *\t\t\t\t'click': {@link module:ui/template~TemplateListenerSchema}\n *\n *\t\t\t\t// Document.querySelector format is also accepted.\n *\t\t\t\t'keyup@a.some-class': {@link module:ui/template~TemplateListenerSchema}\n *\n *\t\t\t\t// ...\n *\t\t\t}\n *\t\t} );\n *\n * A {@link module:ui/view~View}, another {@link module:ui/template~Template} or a native DOM node\n * can also become a child of a template. When a view is passed, its {@link module:ui/view~View#element} is used:\n *\n *\t\tconst view = new SomeView();\n *\t\tconst childTemplate = new Template( { ... } );\n *\t\tconst childNode = document.createElement( 'b' );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\n *\t\t\tchildren: [\n *\t\t\t\t// view#element will be added as a child of this <p>.\n *\t\t\t\tview,\n *\n * \t\t\t\t// The output of childTemplate.render() will be added here.\n *\t\t\t\tchildTemplate,\n *\n *\t\t\t\t// Native DOM nodes are included directly in the rendered output.\n *\t\t\t\tchildNode\n *\t\t\t]\n *\t\t} );\n *\n * An entire {@link module:ui/viewcollection~ViewCollection} can be used as a child in the definition:\n *\n *\t\tconst collection = new ViewCollection();\n *\t\tcollection.add( someView );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\n *\t\t\tchildren: collection\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateDefinition\n * @type Object\n *\n * @property {String} tag See the template {@link module:ui/template~Template#tag} property.\n *\n * @property {Array.<module:ui/template~TemplateDefinition>} [children]\n * See the template {@link module:ui/template~Template#children} property.\n *\n * @property {Object.<String, module:ui/template~TemplateValueSchema>} [attributes]\n * See the template {@link module:ui/template~Template#attributes} property.\n *\n * @property {String|module:ui/template~TemplateValueSchema|Array.<String|module:ui/template~TemplateValueSchema>} [text]\n * See the template {@link module:ui/template~Template#text} property.\n *\n * @property {Object.<String, module:ui/template~TemplateListenerSchema>} [on]\n * See the template {@link module:ui/template~Template#eventListeners} property.\n */\n\n/**\n * Describes a value of an HTML element attribute or `textContent`. It allows combining multiple\n * data sources like static values and {@link module:utils/observablemixin~Observable} attributes.\n *\n * Also see:\n * * {@link module:ui/template~TemplateDefinition} to learn where to use it,\n * * {@link module:ui/template~Template.bind} to learn how to configure\n * {@link module:utils/observablemixin~Observable} attribute bindings,\n * * {@link module:ui/template~Template#render} to learn how to render a template,\n * * {@link module:ui/template~BindChain#to `to()`} and {@link module:ui/template~BindChain#if `if()`}\n * methods to learn more about bindings.\n *\n * Attribute values can be described in many different ways:\n *\n *\t\t// Bind helper will create bindings to attributes of the observable.\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\t// A plain string schema.\n *\t\t\t\t'class': 'static-text',\n *\n *\t\t\t\t// An object schema, binds to the \"foo\" attribute of the\n *\t\t\t\t// observable and follows its value.\n *\t\t\t\t'class': bind.to( 'foo' ),\n *\n *\t\t\t\t// An array schema, combines the above.\n *\t\t\t\t'class': [\n *\t\t\t\t\t'static-text',\n *\t\t\t\t\tbind.to( 'bar', () => { ... } ),\n *\n * \t\t\t\t\t// Bindings can also be conditional.\n *\t\t\t\t\tbind.if( 'baz', 'class-when-baz-is-true' )\n *\t\t\t\t],\n *\n *\t\t\t\t// An array schema, with a custom namespace, e.g. useful for creating SVGs.\n *\t\t\t\t'class': {\n *\t\t\t\t\tns: 'http://ns.url',\n *\t\t\t\t\tvalue: [\n *\t\t\t\t\t\tbind.if( 'baz', 'value-when-true' ),\n *\t\t\t\t\t\t'static-text'\n *\t\t\t\t\t]\n *\t\t\t\t},\n *\n *\t\t\t\t// An object schema, specific for styles.\n *\t\t\t\tstyle: {\n *\t\t\t\t\tcolor: 'red',\n *\t\t\t\t\tbackgroundColor: bind.to( 'qux', () => { ... } )\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * Text nodes can also have complex values:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\t// Will render a \"foo\" text node.\n *\t\tnew Template( {\n *\t\t\ttext: 'foo'\n *\t\t} );\n *\n *\t\t// Will render a \"static text: {observable.foo}\" text node.\n *\t\t// The text of the node will be updated as the \"foo\" attribute changes.\n *\t\tnew Template( {\n *\t\t\ttext: [\n *\t\t\t\t'static text: ',\n *\t\t\t\tbind.to( 'foo', () => { ... } )\n *\t\t\t]\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateValueSchema\n * @type {Object|String|Array}\n */\n\n/**\n * Describes an event listener attached to an HTML element. Such listener can propagate DOM events\n * through an {@link module:utils/observablemixin~Observable} instance, execute custom callbacks\n * or both, if necessary.\n *\n * Also see:\n * * {@link module:ui/template~TemplateDefinition} to learn more about template definitions,\n * * {@link module:ui/template~BindChain#to `to()`} method to learn more about bindings.\n *\n * Check out different ways of attaching event listeners below:\n *\n *\t\t// Bind helper will propagate events through the observable.\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\ton: {\n *\t\t\t\t// An object schema. The observable will fire the \"clicked\" event upon DOM \"click\".\n *\t\t\t\tclick: bind.to( 'clicked' )\n *\n *\t\t\t\t// An object schema. It will work for \"click\" event on \"a.foo\" children only.\n *\t\t\t\t'click@a.foo': bind.to( 'clicked' )\n *\n *\t\t\t\t// An array schema, makes the observable propagate multiple events.\n *\t\t\t\tclick: [\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\t\t\t\t\tbind.to( 'executed' )\n *\t\t\t\t],\n *\n *\t\t\t\t// An array schema with a custom callback.\n *\t\t\t\t'click@a.foo': {\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\t\t\t\t\tbind.to( evt => {\n *\t\t\t\t\t\tconsole.log( `${ evt.target } has been clicked!` );\n *\t\t\t\t\t} }\n *\t\t\t\t}\n *\t\t\t}\n *\t\t} );\n *\n * @typedef module:ui/template~TemplateListenerSchema\n * @type {Object|String|Array}\n */\n\n/**\n * The return value of {@link ~Template.bind `Template.bind()`}. It provides `to()` and `if()`\n * methods to create the {@link module:utils/observablemixin~Observable observable} attribute and event bindings.\n *\n * @interface module:ui/template~BindChain\n */\n\n/**\n * Binds an {@link module:utils/observablemixin~Observable observable} to either:\n *\n * * an HTML element attribute or a text node `textContent`, so it remains in sync with the observable\n * attribute as it changes,\n * * or an HTML element DOM event, so the DOM events are propagated through an observable.\n *\n * Some common use cases of `to()` bindings are presented below:\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'p',\n *\t\t\tattributes: {\n *\t\t\t\t// class=\"...\" attribute gets bound to `observable#a`\n *\t\t\t\tclass: bind.to( 'a' )\n *\t\t\t},\n *\t\t\tchildren: [\n *\t\t\t\t// <p>...</p> gets bound to observable#b; always `toUpperCase()`.\n *\t\t\t\t{\n *\t\t\t\t\ttext: bind.to( 'b', ( value, node ) => value.toUpperCase() )\n *\t\t\t\t}\n *\t\t\t],\n *\t\t\ton: {\n *\t\t\t\tclick: [\n *\t\t\t\t\t// An observable will fire \"clicked\" upon \"click\" in the DOM.\n *\t\t\t\t\tbind.to( 'clicked' ),\n *\n *\t\t\t\t\t// A custom callback will be executed upon \"click\" in the DOM.\n *\t\t\t\t\tbind.to( () => {\n *\t\t\t\t\t\t...\n *\t\t\t\t\t} )\n *\t\t\t\t]\n *\t\t\t}\n *\t\t} ).render();\n *\n * Learn more about using `to()` in the {@link module:ui/template~TemplateValueSchema} and\n * {@link module:ui/template~TemplateListenerSchema}.\n *\n * @method #to\n * @param {String|Function} eventNameOrFunctionOrAttribute An attribute name of\n * {@link module:utils/observablemixin~Observable} or a DOM event name or an event callback.\n * @param {Function} [callback] Allows for processing of the value. Accepts `Node` and `value` as arguments.\n * @returns {module:ui/template~TemplateBinding}\n */\n\n/**\n * Binds an {@link module:utils/observablemixin~Observable observable} to an HTML element attribute or a text\n * node `textContent` so it remains in sync with the observable attribute as it changes.\n *\n * Unlike {@link module:ui/template~BindChain#to}, it controls the presence of the attribute or `textContent`\n * depending on the \"falseness\" of an {@link module:utils/observablemixin~Observable} attribute.\n *\n *\t\tconst bind = Template.bind( observable, emitter );\n *\n *\t\tnew Template( {\n *\t\t\ttag: 'input',\n *\t\t\tattributes: {\n *\t\t\t\t// <input checked> when `observable#a` is not undefined/null/false/''\n *\t\t\t\t// <input> when `observable#a` is undefined/null/false\n *\t\t\t\tchecked: bind.if( 'a' )\n *\t\t\t},\n *\t\t\tchildren: [\n *\t\t\t\t{\n *\t\t\t\t\t// <input>\"b-is-not-set\"</input> when `observable#b` is undefined/null/false/''\n *\t\t\t\t\t// <input></input> when `observable#b` is not \"falsy\"\n *\t\t\t\t\ttext: bind.if( 'b', 'b-is-not-set', ( value, node ) => !value )\n *\t\t\t\t}\n *\t\t\t]\n *\t\t} ).render();\n *\n * Learn more about using `if()` in the {@link module:ui/template~TemplateValueSchema}.\n *\n * @method #if\n * @param {String} attribute An attribute name of {@link module:utils/observablemixin~Observable} used in the binding.\n * @param {String} [valueIfTrue] Value set when the {@link module:utils/observablemixin~Observable} attribute is not\n * undefined/null/false/'' (empty string).\n * @param {Function} [callback] Allows for processing of the value. Accepts `Node` and `value` as arguments.\n * @returns {module:ui/template~TemplateBinding}\n */\n\n/**\n * The {@link module:ui/template~Template#_renderNode} configuration.\n *\n * @private\n * @interface module:ui/template~RenderData\n */\n\n/**\n * Tells {@link module:ui/template~Template#_renderNode} to render\n * children into `DocumentFragment` first and then append the fragment\n * to the parent element. It is a speed optimization.\n *\n * @member {Boolean} #intoFragment\n */\n\n/**\n * A node which is being rendered.\n *\n * @member {HTMLElement|Text} #node\n */\n\n/**\n * Indicates whether the {@module:ui/template~RenderNodeOptions#node} has\n * been provided by {@module:ui/template~Template#apply}.\n *\n * @member {Boolean} #isApplying\n */\n\n/**\n * An object storing the data that helps {@module:ui/template~Template#revert}\n * bringing back an element to its initial state, i.e. before\n * {@module:ui/template~Template#apply} was called.\n *\n * @member {Object} #revertData\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/view\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ViewCollection from './viewcollection';\nimport Template from './template';\nimport DomEmitterMixin from '@ckeditor/ckeditor5-utils/src/dom/emittermixin';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\n\nimport '../theme/globals/globals.css';\n\n/**\n * The basic view class, which represents an HTML element created out of a\n * {@link module:ui/view~View#template}. Views are building blocks of the user interface and handle\n * interaction\n *\n * Views {@link module:ui/view~View#registerChild aggregate} children in\n * {@link module:ui/view~View#createCollection collections} and manage the life cycle of DOM\n * listeners e.g. by handling rendering and destruction.\n *\n * See the {@link module:ui/template~TemplateDefinition} syntax to learn more about shaping view\n * elements, attributes and listeners.\n *\n *\t\tclass SampleView extends View {\n *\t\t\tconstructor( locale ) {\n *\t\t\t\tsuper( locale );\n *\n *\t\t\t\tconst bind = this.bindTemplate;\n *\n *\t\t\t\t// Views define their interface (state) using observable attributes.\n *\t\t\t\tthis.set( 'elementClass', 'bar' );\n *\n *\t\t\t\tthis.setTemplate( {\n *\t\t\t\t\ttag: 'p',\n *\n *\t\t\t\t\t// The element of the view can be defined with its children.\n *\t\t\t\t\tchildren: [\n *\t\t\t\t\t\t'Hello',\n *\t\t\t\t\t\t{\n *\t\t\t\t\t\t\ttag: 'b',\n *\t\t\t\t\t\t\tchildren: [ 'world!' ]\n *\t\t\t\t\t\t}\n *\t\t\t\t\t],\n *\t\t\t\t\tattributes: {\n *\t\t\t\t\t\tclass: [\n *\t\t\t\t\t\t\t'foo',\n *\n *\t\t\t\t\t\t\t// Observable attributes control the state of the view in DOM.\n *\t\t\t\t\t\t\tbind.to( 'elementClass' )\n *\t\t\t\t\t\t]\n *\t\t\t\t\t},\n *\t\t\t\t\ton: {\n *\t\t\t\t\t\t// Views listen to DOM events and propagate them.\n *\t\t\t\t\t\tclick: bind.to( 'clicked' )\n *\t\t\t\t\t}\n *\t\t\t\t} );\n *\t\t\t}\n *\t\t}\n *\n *\t\tconst view = new SampleView( locale );\n *\n *\t\tview.render();\n *\n *\t\t// Append <p class=\"foo bar\">Hello<b>world</b></p> to the <body>\n *\t\tdocument.body.appendChild( view.element );\n *\n *\t\t// Change the class attribute to <p class=\"foo baz\">Hello<b>world</b></p>\n *\t\tview.elementClass = 'baz';\n *\n *\t\t// Respond to the \"click\" event in DOM by executing a custom action.\n *\t\tview.on( 'clicked', () => {\n *\t\t\tconsole.log( 'The view has been clicked!' );\n *\t\t} );\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class View {\n\t/**\n\t * Creates an instance of the {@link module:ui/view~View} class.\n\t *\n\t * Also see {@link #render}.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The localization services instance.\n\t */\n\tconstructor( locale ) {\n\t\t/**\n\t\t * An HTML element of the view. `null` until {@link #render rendered}\n\t\t * from the {@link #template}.\n\t\t *\n\t\t *\t\tclass SampleView extends View {\n\t\t *\t\t\tconstructor() {\n\t\t *\t\t\t\tsuper();\n\t\t *\n\t\t *\t\t\t\t// A template instance the #element will be created from.\n\t\t *\t\t\t\tthis.setTemplate( {\n\t\t *\t\t\t\t\ttag: 'p'\n\t\t *\n\t\t *\t\t\t\t\t// ...\n\t\t *\t\t\t\t} );\n\t\t *\t\t\t}\n\t\t *\t\t}\n\t\t *\n\t\t *\t\tconst view = new SampleView();\n\t\t *\n\t\t *\t\t// Renders the #template.\n\t\t *\t\tview.render();\n\t\t *\n\t\t *\t\t// Append the HTML element of the view to <body>.\n\t\t *\t\tdocument.body.appendChild( view.element );\n\t\t *\n\t\t * **Note**: The element of the view can also be assigned directly:\n\t\t *\n\t\t *\t\tview.element = document.querySelector( '#my-container' );\n\t\t *\n\t\t * @member {HTMLElement}\n\t\t */\n\t\tthis.element = null;\n\n\t\t/**\n\t\t * Set `true` when the view has already been {@link module:ui/view~View#render rendered}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isRendered\n\t\t */\n\t\tthis.isRendered = false;\n\n\t\t/**\n\t\t * A set of tools to localize the user interface.\n\t\t *\n\t\t * Also see {@link module:core/editor/editor~Editor#locale}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/locale~Locale}\n\t\t */\n\t\tthis.locale = locale;\n\n\t\t/**\n\t\t * Shorthand for {@link module:utils/locale~Locale#t}.\n\t\t *\n\t\t * Note: If {@link #locale} instance hasn't been passed to the view this method may not\n\t\t * be available.\n\t\t *\n\t\t * @see module:utils/locale~Locale#t\n\t\t * @method\n\t\t */\n\t\tthis.t = locale && locale.t;\n\n\t\t/**\n\t\t * Collections registered with {@link #createCollection}.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set.<module:ui/viewcollection~ViewCollection>}\n\t\t */\n\t\tthis._viewCollections = new Collection();\n\n\t\t/**\n\t\t * A collection of view instances, which have been added directly\n\t\t * into the {@link module:ui/template~Template#children}.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis._unboundChildren = this.createCollection();\n\n\t\t// Pass parent locale to its children.\n\t\tthis._viewCollections.on( 'add', ( evt, collection ) => {\n\t\t\tcollection.locale = locale;\n\t\t} );\n\n\t\t/**\n\t\t * Template of this view. It provides the {@link #element} representing\n\t\t * the view in DOM, which is {@link #render rendered}.\n\t\t *\n\t\t * @member {module:ui/template~Template} #template\n\t\t */\n\n\t\t/**\n\t\t * Cached {@link module:ui/template~BindChain bind chain} object created by the\n\t\t * {@link #template}. See {@link #bindTemplate}.\n\t\t *\n\t\t * @private\n\t\t * @member {Object} #_bindTemplate\n\t\t */\n\n\t\tthis.decorate( 'render' );\n\t}\n\n\t/**\n\t * Shorthand for {@link module:ui/template~Template.bind}, a binding\n\t * {@link module:ui/template~BindChain interface} pre–configured for the view instance.\n\t *\n\t * It provides {@link module:ui/template~BindChain#to `to()`} and\n\t * {@link module:ui/template~BindChain#if `if()`} methods that initialize bindings with\n\t * observable attributes and attach DOM listeners.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tconst bind = this.bindTemplate;\n\t *\n\t *\t\t\t\t// These {@link module:utils/observablemixin~Observable observable} attributes will control\n\t *\t\t\t\t// the state of the view in DOM.\n\t *\t\t\t\tthis.set( {\n\t *\t\t\t\t\telementClass: 'foo',\n\t *\t\t\t\t \tisEnabled: true\n\t *\t\t\t\t } );\n\t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n\t *\t\t\t\t\tattributes: {\n\t *\t\t\t\t\t\t// The class HTML attribute will follow elementClass\n\t *\t\t\t\t\t\t// and isEnabled view attributes.\n\t *\t\t\t\t\t\tclass: [\n\t *\t\t\t\t\t\t\tbind.to( 'elementClass' )\n\t *\t\t\t\t\t\t\tbind.if( 'isEnabled', 'present-when-enabled' )\n\t *\t\t\t\t\t\t]\n\t *\t\t\t\t\t},\n\t *\n\t *\t\t\t\t\ton: {\n\t *\t\t\t\t\t\t// The view will fire the \"clicked\" event upon clicking <p> in DOM.\n\t *\t\t\t\t\t\tclick: bind.to( 'clicked' )\n\t *\t\t\t\t\t}\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @method #bindTemplate\n\t */\n\tget bindTemplate() {\n\t\tif ( this._bindTemplate ) {\n\t\t\treturn this._bindTemplate;\n\t\t}\n\n\t\treturn ( this._bindTemplate = Template.bind( this, this ) );\n\t}\n\n\t/**\n\t * Creates a new collection of views, which can be used as\n\t * {@link module:ui/template~Template#children} of this view.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tthis.items = this.createCollection();\n \t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n\t *\t\t\t\t\t// `items` collection will render here.\n\t *\t\t\t\t\tchildren: this.items\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView( locale );\n\t *\t\tconst child = new ChildView( locale );\n\t *\n\t *\t\tview.render();\n\t *\n\t *\t\t// It will append <p></p> to the <body>.\n\t *\t\tdocument.body.appendChild( view.element );\n\t *\n\t *\t\t// From now on the child is nested under its parent, which is also reflected in DOM.\n\t *\t\t// <p><child#element></p>\n\t *\t\tview.items.add( child );\n\t *\n\t * @returns {module:ui/viewcollection~ViewCollection} A new collection of view instances.\n\t */\n\tcreateCollection() {\n\t\tconst collection = new ViewCollection();\n\n\t\tthis._viewCollections.add( collection );\n\n\t\treturn collection;\n\t}\n\n\t/**\n\t * Registers a new child view under the view instance. Once registered, a child\n\t * view is managed by its parent, including {@link #render rendering}\n\t * and {@link #destroy destruction}.\n\t *\n\t * To revert this, use {@link #deregisterChild}.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tthis.childA = new SomeChildView( locale );\n\t *\t\t\t\tthis.childB = new SomeChildView( locale );\n\t *\n\t *\t\t\t\tthis.setTemplate( { tag: 'p' } );\n\t *\n\t *\t\t\t\t// Register the children.\n\t *\t\t\t\tthis.registerChild( [ this.childA, this.childB ] );\n\t *\t\t\t}\n\t *\n\t *\t\t\trender() {\n\t *\t\t\t\tsuper.render();\n\t *\n\t *\t\t\t\tthis.element.appendChild( this.childA.element );\n\t *\t\t\t\tthis.element.appendChild( this.childB.element );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView( locale );\n\t *\n\t *\t\tview.render();\n\t *\n\t *\t\t// Will append <p><childA#element><b></b><childB#element></p>.\n\t *\t\tdocument.body.appendChild( view.element );\n\t *\n\t * **Note**: There's no need to add child views if they're already referenced in the\n\t * {@link #template}:\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor( locale ) {\n\t *\t\t\t\tsuper( locale );\n\t *\n\t *\t\t\t\tthis.childA = new SomeChildView( locale );\n\t *\t\t\t\tthis.childB = new SomeChildView( locale );\n\t *\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\ttag: 'p',\n\t *\n \t *\t\t\t\t\t// These children will be added automatically. There's no\n \t *\t\t\t\t\t// need to call {@link #registerChild} for any of them.\n\t *\t\t\t\t\tchildren: [ this.childA, this.childB ]\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\n\t *\t\t\t// ...\n\t *\t\t}\n\t *\n\t * @param {module:ui/view~View|Iterable.<module:ui/view~View>} children Children views to be registered.\n\t */\n\tregisterChild( children ) {\n\t\tif ( !isIterable( children ) ) {\n\t\t\tchildren = [ children ];\n\t\t}\n\n\t\tfor ( const child of children ) {\n\t\t\tthis._unboundChildren.add( child );\n\t\t}\n\t}\n\n\t/**\n\t * The opposite of {@link #registerChild}. Removes a child view from this view instance.\n\t * Once removed, the child is no longer managed by its parent, e.g. it can safely\n\t * become a child of another parent view.\n\t *\n\t * @see #registerChild\n\t * @param {module:ui/view~View|Iterable.<module:ui/view~View>} children Child views to be removed.\n\t */\n\tderegisterChild( children ) {\n\t\tif ( !isIterable( children ) ) {\n\t\t\tchildren = [ children ];\n\t\t}\n\n\t\tfor ( const child of children ) {\n\t\t\tthis._unboundChildren.remove( child );\n\t\t}\n\t}\n\n\t/**\n\t * Sets the {@link #template} of the view with with given definition.\n\t *\n\t * A shorthand for:\n\t *\n\t *\t\tview.setTemplate( definition );\n\t *\n\t * @param {module:ui/template~TemplateDefinition} definition Definition of view's template.\n\t */\n\tsetTemplate( definition ) {\n\t\tthis.template = new Template( definition );\n\t}\n\n\t/**\n\t * {@link module:ui/template~Template.extend Extends} the {@link #template} of the view with\n\t * with given definition.\n\t *\n\t * A shorthand for:\n\t *\n\t *\t\tTemplate.extend( view.template, definition );\n\t *\n\t * **Note**: Is requires the {@link #template} to be already set. See {@link #setTemplate}.\n\t *\n\t * @param {module:ui/template~TemplateDefinition} definition Definition which\n\t * extends the {@link #template}.\n\t */\n\textendTemplate( definition ) {\n\t\tTemplate.extend( this.template, definition );\n\t}\n\n\t/**\n\t * Recursively renders the view.\n\t *\n\t * Once the view is rendered:\n\t * * the {@link #element} becomes an HTML element out of {@link #template},\n\t * * the {@link #isRendered} flag is set `true`.\n\t *\n\t * **Note**: The children of the view:\n\t * * defined directly in the {@link #template}\n\t * * residing in collections created by the {@link #createCollection} method,\n\t * * and added by {@link #registerChild}\n\t * are also rendered in the process.\n\t *\n\t * In general, `render()` method is the right place to keep the code which refers to the\n\t * {@link #element} and should be executed at the very beginning of the view's life cycle.\n\t *\n\t * It is possible to {@link module:ui/template~Template.extend} the {@link #template} before\n\t * the view is rendered. To allow an early customization of the view (e.g. by its parent),\n\t * such references should be done in `render()`.\n\t *\n\t *\t\tclass SampleView extends View {\n\t *\t\t\tconstructor() {\n\t *\t\t\t\tthis.setTemplate( {\n\t *\t\t\t\t\t// ...\n\t *\t\t\t\t} );\n\t *\t\t\t},\n\t *\n\t *\t\t\trender() {\n\t *\t\t\t\t// View#element becomes available.\n\t *\t\t\t\tsuper.render();\n\t *\n\t *\t\t\t\t// The \"scroll\" listener depends on #element.\n\t *\t\t\t\tthis.listenTo( window, 'scroll', () => {\n\t *\t\t\t\t\t// A reference to #element would render the #template and make it non-extendable.\n\t *\t\t\t\t\tif ( window.scrollY > 0 ) {\n\t *\t\t\t\t\t\tthis.element.scrollLeft = 100;\n\t *\t\t\t\t\t} else {\n\t *\t\t\t\t\t\tthis.element.scrollLeft = 0;\n\t *\t\t\t\t\t}\n\t *\t\t\t\t} );\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t *\t\tconst view = new SampleView();\n\t *\n\t *\t\t// Let's customize the view before it gets rendered.\n\t *\t\tview.extendTemplate( {\n\t *\t\t\tattributes: {\n\t *\t\t\t\tclass: [\n\t *\t\t\t\t\t'additional-class'\n\t *\t\t\t\t]\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t *\t\t// Late rendering allows customization of the view.\n\t *\t\tview.render();\n\t */\n\trender() {\n\t\tif ( this.isRendered ) {\n\t\t\t/**\n\t\t\t * This View has already been rendered.\n\t\t\t *\n\t\t\t * @error ui-view-render-rendered\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'ui-view-render-already-rendered: This View has already been rendered.' );\n\t\t}\n\n\t\t// Render #element of the view.\n\t\tif ( this.template ) {\n\t\t\tthis.element = this.template.render();\n\n\t\t\t// Auto–register view children from #template.\n\t\t\tthis.registerChild( this.template.getViews() );\n\t\t}\n\n\t\tthis.isRendered = true;\n\t}\n\n\t/**\n\t * Recursively destroys the view instance and child views added by {@link #registerChild} and\n\t * residing in collections created by the {@link #createCollection}.\n\t *\n\t * Destruction disables all event listeners:\n\t * * created on the view, e.g. `view.on( 'event', () => {} )`,\n\t * * defined in the {@link #template} for DOM events.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\n\t\tthis._viewCollections.map( c => c.destroy() );\n\t}\n\n\t/**\n\t * Event fired by the {@link #render} method. Actual rendering is executed as a listener to\n\t * this event with the default priority.\n\t *\n\t * See {@link module:utils/observablemixin~ObservableMixin.decorate} for more information and samples.\n\t *\n\t * @event render\n\t */\n}\n\nmix( View, DomEmitterMixin );\nmix( View, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/editorui/editoruiview\n */\n\n/* globals document */\n\nimport View from '../view';\nimport Template from '../template';\n\nimport '../../theme/components/editorui/editorui.css';\n\n/**\n * The editor UI view class. Base class for the editor main views.\n *\n * @extends module:ui/view~View\n */\nexport default class EditorUIView extends View {\n\t/**\n\t * Creates an instance of the editor UI view class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Collection of the child views, detached from the DOM\n\t\t * structure of the editor, like panels, icons etc.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection} #body\n\t\t */\n\t\tthis.body = this.createCollection();\n\n\t\t/**\n\t\t * The element holding elements of the 'body' region.\n\t\t *\n\t\t * @private\n\t\t * @member {HTMLElement} #_bodyCollectionContainer\n\t\t */\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis._renderBodyCollection();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis._bodyCollectionContainer.remove();\n\n\t\treturn super.destroy();\n\t}\n\n\t/**\n\t * Creates and appends to `<body>` the {@link #body} collection container.\n\t *\n\t * @private\n\t */\n\t_renderBodyCollection() {\n\t\tconst bodyElement = this._bodyCollectionContainer = new Template( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset_all',\n\t\t\t\t\t'ck-body',\n\t\t\t\t\t'ck-rounded-corners'\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: this.body\n\t\t} ).render();\n\n\t\tdocument.body.appendChild( bodyElement );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/label/labelview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/label/label.css';\n\n/**\n * The label view class.\n *\n * @extends module:ui/view~View\n */\nexport default class LabelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The text of the label.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #text\n\t\t */\n\t\tthis.set( 'text' );\n\n\t\t/**\n\t\t * The `for` attribute of the label (i.e. to pair with an `<input>` element).\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #for\n\t\t */\n\t\tthis.set( 'for' );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'label',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-label'\n\t\t\t\t],\n\t\t\t\tfor: bind.to( 'for' )\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttext: bind.to( 'text' )\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module ui/editorui/boxed/boxededitoruiview\n */\nimport EditorUIView from '../../editorui/editoruiview';\nimport LabelView from '../../label/labelview';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\n/**\n * The boxed editor UI view class. This class represents an editor interface\n * consisting of a toolbar and an editable area, enclosed within a box.\n *\n * @extends module:ui/editorui/editoruiview~EditorUIView\n */\nexport default class BoxedEditorUIView extends EditorUIView {\n    /**\n\t * Creates an instance of the boxed editor UI view class.\n\t *\n\t * @param {module:utils/locale~Locale} locale The locale instance..\n\t */\n    constructor(locale) {\n        super(locale);\n        const ariaLabelUid = uid();\n        /**\n\t\t * Collection of the child views located in the top (`.ck-editor__top`)\n\t\t * area of the UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n        this.top = this.createCollection();\n        /**\n\t\t * Collection of the child views located in the main (`.ck-editor__main`)\n\t\t * area of the UI.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n        this.main = this.createCollection();\n        /**\n\t\t * Voice label of the UI.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #_voiceLabelView\n\t\t */\n        this._voiceLabelView = this._createVoiceLabel(ariaLabelUid);\n        this.setTemplate({\n            tag: 'div',\n            attributes: {\n                class: [\n                    'ck',\n                    'ck-reset',\n                    'ck-editor',\n                    'ck-rounded-corners'\n                ],\n                role: 'application',\n                dir: 'ltr',\n                lang: locale.language,\n                'aria-labelledby': `ck-editor__aria-label_${ ariaLabelUid }`\n            },\n            children: [\n                this._voiceLabelView,\n                {\n                    tag: 'div',\n                    attributes: {\n                        class: [\n                            'ck',\n                            'ck-editor__top',\n                            'ck-reset_all'\n                        ],\n                        role: 'presentation'\n                    },\n                    children: this.top\n                },\n                {\n                    tag: 'div',\n                    attributes: {\n                        class: [\n                            'ck',\n                            'ck-editor__main'\n                        ],\n                        role: 'presentation'\n                    },\n                    children: this.main\n                }\n            ]\n        });\n    }\n    /**\n\t * Creates a voice label view instance.\n\t *\n\t * @private\n\t * @returns {module:ui/label/labelview~LabelView}\n\t */\n    _createVoiceLabel(ariaLabelUid) {\n        const t = this.t;\n        const voiceLabel = new LabelView();\n        voiceLabel.text = t('c');\n        voiceLabel.extendTemplate({\n            attributes: {\n                id: `ck-editor__aria-label_${ ariaLabelUid }`,\n                class: 'ck-voice-label'\n            }\n        });\n        return voiceLabel;\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/editableui/editableuiview\n */\n\nimport View from '../view';\n\n/**\n * The editable UI view class.\n *\n * @extends module:ui/view~View\n */\nexport default class EditableUIView extends View {\n\t/**\n\t * Creates an instance of EditableUIView class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t * @param {HTMLElement} [editableElement] The editable element. If not specified, this view\n\t * should create it. Otherwise, the existing element should be used.\n\t */\n\tconstructor( locale, editableElement ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tif ( editableElement ) {\n\t\t\tthis.element = this.editableElement = editableElement;\n\t\t}\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-content',\n\t\t\t\t\t'ck-editor__editable',\n\t\t\t\t\t'ck-rounded-corners',\n\t\t\t\t\tbind.to( 'isFocused', value => value ? 'ck-focused' : 'ck-blurred' )\n\t\t\t\t],\n\t\t\t\tcontenteditable: bind.to( 'isReadOnly', value => !value ),\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Controls whether the editable is writable or not.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * Controls whether the editable is focused, i.e. the user is typing in it.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * An external {@link #editableElement} passed into the constructor, which also means\n\t\t * the view will not render its {@link #template}.\n\t\t *\n\t\t * @member {HTMLElement} #externalElement\n\t\t */\n\t\tthis.externalElement = editableElement;\n\n\t\t/**\n\t\t * The element which is the main editable element (usually the one with `contentEditable=\"true\"`).\n\t\t *\n\t\t * @readonly\n\t\t * @member {HTMLElement} #editableElement\n\t\t */\n\t}\n\n\t/**\n\t * Renders the view by either applying the {@link #template} to the existing\n\t * {@link #editableElement} or assigning {@link #element} as {@link #editableElement}.\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tif ( this.externalElement ) {\n\t\t\tthis.template.apply( this.element = this.externalElement );\n\t\t} else {\n\t\t\tthis.editableElement = this.element;\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tif ( this.externalElement ) {\n\t\t\tthis.template.revert( this.externalElement );\n\t\t}\n\n\t\tsuper.destroy();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module ui/editableui/inline/inlineeditableuiview\n */\nimport EditableUIView from '../../editableui/editableuiview';\n/**\n * The inline editable UI class implementing an inline {@link module:ui/editableui/editableuiview~EditableUIView}.\n *\n * @extends module:ui/editableui/editableuiview~EditableUIView\n */\nexport default class InlineEditableUIView extends EditableUIView {\n    /**\n\t * Creates an instance of the InlineEditableUIView class.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The locale instance.\n\t * @param {HTMLElement} [editableElement] The editable element. If not specified, the\n\t * {@link module:ui/editableui/editableuiview~EditableUIView}\n\t * will create it. Otherwise, the existing element will be used.\n\t */\n    constructor(locale, editableElement) {\n        super(locale, editableElement);\n        const bind = this.bindTemplate;\n        const t = this.t;\n        /**\n\t\t * The name of the editable UI view.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #name\n\t\t */\n        this.set('name', null);\n        const getLabel = value => {\n            return t('af', [value]);\n        };\n        this.extendTemplate({\n            attributes: {\n                role: 'textbox',\n                'aria-label': bind.to('name', getLabel),\n                class: 'ck-editor__editable_inline'\n            }\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/tounit\n */\n\n/**\n * Returns a helper function, which adds a desired trailing\n * `unit` to the passed value.\n *\n * @param {String} unit An unit like \"px\" or \"em\".\n * @returns {module:utils/dom/tounit~helper}\n */\nexport default function toUnit( unit ) {\n\t/**\n\t * A function, which adds a pre–defined trailing `unit`\n\t * to the passed `value`.\n\t *\n\t * @function helper\n \t * @param {*} value A value to be given the unit.\n \t * @returns {String} A value with the trailing unit.\n\t */\n\treturn value => value + unit;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/panel/sticky/stickypanelview\n */\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport View from '../../view';\nimport Template from '../../template';\nimport toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';\n\nimport '../../../theme/components/panel/stickypanel.css';\n\nconst toPx = toUnit( 'px' );\n\n/**\n * The sticky panel view class.\n */\nexport default class StickyPanelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Controls whether the sticky panel should be active.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isActive\n\t\t */\n\t\tthis.set( 'isActive', false );\n\n\t\t/**\n\t\t * Controls whether the sticky panel is in the \"sticky\" state.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #isSticky\n\t\t */\n\t\tthis.set( 'isSticky', false );\n\n\t\t/**\n\t\t * The limiter element for the sticky panel instance. Its bounding rect limits\n\t\t * the \"stickyness\" of the panel, i.e. when the panel reaches the bottom\n\t\t * edge of the limiter, it becomes sticky to that edge and does not float\n\t\t * off the limiter. It is mandatory for the panel to work properly and once\n\t\t * set, it cannot be changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {HTMLElement} #limiterElement\n\t\t */\n\t\tthis.set( 'limiterElement', null );\n\n\t\t/**\n\t\t * The offset from the bottom edge of {@link #limiterElement}\n\t\t * which stops the panel from stickying any further to prevent limiter's content\n\t\t * from being completely covered.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @default 50\n\t\t * @member {Number} #limiterBottomOffset\n\t\t */\n\t\tthis.set( 'limiterBottomOffset', 50 );\n\n\t\t/**\n\t\t * The offset from the top edge of the web browser's viewport which makes the\n\t\t * panel become sticky. The default value is `0`, which means the panel becomes\n\t\t * sticky when it's upper edge touches the top of the page viewport.\n\t\t *\n\t\t * This attribute is useful when the web page has UI elements positioned to the top\n\t\t * either using `position: fixed` or `position: sticky`, which would cover the\n\t\t * sticky panel or vice–versa (depending on the `z-index` hierarchy).\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @default 0\n\t\t * @member {Number} #viewportTopOffset\n\t\t */\n\t\tthis.set( 'viewportTopOffset', 0 );\n\n\t\t/**\n\t\t * Controls the `margin-left` CSS style of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {String} #_marginLeft\n\t\t */\n\t\tthis.set( '_marginLeft', null );\n\n\t\t/**\n\t\t * Set `true` if the sticky panel reached the bottom edge of the\n\t\t * {@link #limiterElement}.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #_isStickyToTheLimiter\n\t\t */\n\t\tthis.set( '_isStickyToTheLimiter', false );\n\n\t\t/**\n\t\t * Set `true` if the sticky panel uses the {@link #viewportTopOffset},\n\t\t * i.e. not {@link #_isStickyToTheLimiter} and the {@link #viewportTopOffset}\n\t\t * is not `0`.\n\t\t *\n\t\t * @protected\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #_hasViewportTopOffset\n\t\t */\n\t\tthis.set( '_hasViewportTopOffset', false );\n\n\t\t/**\n\t\t * Collection of the child views which creates balloon panel contents.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.content = this.createCollection();\n\n\t\t/**\n\t\t * The DOM bounding client rect of the {@link module:ui/view~View#element} of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @member {Object} #_panelRect\n\t\t */\n\n\t\t/**\n\t\t * The DOM bounding client rect of the {@link #limiterElement}\n\t\t * of the panel.\n\t\t *\n\t\t * @protected\n\t\t * @member {Object} #_limiterRect\n\t\t */\n\n\t\t/**\n\t\t * A dummy element which visually fills the space as long as the\n\t\t * actual panel is sticky. It prevents flickering of the UI.\n\t\t *\n\t\t * @protected\n\t\t * @property {HTMLElement}\n\t\t */\n\t\tthis._contentPanelPlaceholder = new Template( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel__placeholder'\n\t\t\t\t],\n\t\t\t\tstyle: {\n\t\t\t\t\tdisplay: bind.to( 'isSticky', isSticky => isSticky ? 'block' : 'none' ),\n\t\t\t\t\theight: bind.to( 'isSticky', isSticky => {\n\t\t\t\t\t\treturn isSticky ? toPx( this._panelRect.height ) : null;\n\t\t\t\t\t} )\n\t\t\t\t}\n\t\t\t}\n\t\t} ).render();\n\n\t\t/**\n\t\t * The panel which accepts children into {@link #content} collection.\n\t\t * Also an element which is positioned when {@link #isSticky}.\n\t\t *\n\t\t * @protected\n\t\t * @property {HTMLElement}\n\t\t */\n\t\tthis._contentPanel = new Template( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel__content',\n\t\t\t\t\t// Toggle class of the panel when \"sticky\" state changes in the view.\n\t\t\t\t\tbind.if( 'isSticky', 'ck-sticky-panel__content_sticky' ),\n\t\t\t\t\tbind.if( '_isStickyToTheLimiter', 'ck-sticky-panel__content_sticky_bottom-limit' ),\n\t\t\t\t],\n\t\t\t\tstyle: {\n\t\t\t\t\twidth: bind.to( 'isSticky', isSticky => {\n\t\t\t\t\t\treturn isSticky ? toPx( this._contentPanelPlaceholder.getBoundingClientRect().width ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\ttop: bind.to( '_hasViewportTopOffset', _hasViewportTopOffset => {\n\t\t\t\t\t\treturn _hasViewportTopOffset ? toPx( this.viewportTopOffset ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\tbottom: bind.to( '_isStickyToTheLimiter', _isStickyToTheLimiter => {\n\t\t\t\t\t\treturn _isStickyToTheLimiter ? toPx( this.limiterBottomOffset ) : null;\n\t\t\t\t\t} ),\n\n\t\t\t\t\tmarginLeft: bind.to( '_marginLeft' )\n\t\t\t\t}\n\t\t\t},\n\n\t\t\tchildren: this.content\n\t\t} ).render();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-sticky-panel'\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\tthis._contentPanelPlaceholder,\n\t\t\t\tthis._contentPanel\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Check if the panel should go into the sticky state immediately.\n\t\tthis._checkIfShouldBeSticky();\n\n\t\t// Update sticky state of the panel as the window is being scrolled.\n\t\tthis.listenTo( global.window, 'scroll', () => {\n\t\t\tthis._checkIfShouldBeSticky();\n\t\t} );\n\n\t\t// Synchronize with `model.isActive` because sticking an inactive panel is pointless.\n\t\tthis.listenTo( this, 'change:isActive', () => {\n\t\t\tthis._checkIfShouldBeSticky();\n\t\t} );\n\t}\n\n\t/**\n\t * Analyzes the environment to decide whether the panel should\n\t * be sticky or not.\n\t *\n\t * @protected\n\t */\n\t_checkIfShouldBeSticky() {\n\t\tconst panelRect = this._panelRect = this._contentPanel.getBoundingClientRect();\n\t\tlet limiterRect;\n\n\t\tif ( !this.limiterElement ) {\n\t\t\tthis.isSticky = false;\n\t\t} else {\n\t\t\tlimiterRect = this._limiterRect = this.limiterElement.getBoundingClientRect();\n\n\t\t\t// The panel must be active to become sticky.\n\t\t\tthis.isSticky = this.isActive &&\n\t\t\t\t// The limiter's top edge must be beyond the upper edge of the visible viewport (+the viewportTopOffset).\n\t\t\t\tlimiterRect.top < this.viewportTopOffset &&\n\t\t\t\t// The model#limiterElement's height mustn't be smaller than the panel's height and model#limiterBottomOffset.\n\t\t\t\t// There's no point in entering the sticky mode if the model#limiterElement is very, very small, because\n\t\t\t\t// it would immediately set model#_isStickyToTheLimiter true and, given model#limiterBottomOffset, the panel\n\t\t\t\t// would be positioned before the model#limiterElement.\n\t\t\t\tthis._panelRect.height + this.limiterBottomOffset < limiterRect.height;\n\t\t}\n\n\t\t// Stick the panel to the top edge of the viewport simulating CSS position:sticky.\n\t\t// TODO: Possibly replaced by CSS in the future http://caniuse.com/#feat=css-sticky\n\t\tif ( this.isSticky ) {\n\t\t\tthis._isStickyToTheLimiter =\n\t\t\t\tlimiterRect.bottom < panelRect.height + this.limiterBottomOffset + this.viewportTopOffset;\n\t\t\tthis._hasViewportTopOffset = !this._isStickyToTheLimiter && !!this.viewportTopOffset;\n\t\t\tthis._marginLeft = this._isStickyToTheLimiter ? null : toPx( -global.window.scrollX );\n\t\t}\n\t\t// Detach the panel from the top edge of the viewport.\n\t\telse {\n\t\t\tthis._isStickyToTheLimiter = false;\n\t\t\tthis._hasViewportTopOffset = false;\n\t\t\tthis._marginLeft = null;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/focuscycler\n */\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\n\n/**\n * A utility class that helps cycling over focusable {@link module:ui/view~View views} in a\n * {@link module:ui/viewcollection~ViewCollection} when the focus is tracked by the\n * {@link module:utils/focustracker~FocusTracker} instance. It helps implementing keyboard\n * navigation in HTML forms, toolbars, lists and the like.\n *\n * To work properly it requires:\n * * a collection of focusable (HTML `tabindex` attribute) views that implement the `focus()` method,\n * * an associated focus tracker to determine which view is focused.\n *\n * A simple cycler setup can look like this:\n *\n *\t\tconst focusables = new ViewCollection();\n *\t\tconst focusTracker = new FocusTracker();\n *\n *\t\t// Add focusable views to the focus tracker.\n *\t\tfocusTracker.add( ... );\n *\n * Then, the cycler can be used manually:\n *\n *\t\tconst cycler = new FocusCycler( { focusables, focusTracker } );\n *\n *\t\t// Will focus the first focusable view in #focusables.\n *\t\tcycler.focusFirst();\n *\n *\t\t// Will log the next focusable item in #focusables.\n *\t\tconsole.log( cycler.next );\n *\n * Alternatively, it can work side by side with the {@link module:utils/keystrokehandler~KeystrokeHandler}:\n *\n *\t\tconst keystrokeHandler = new KeystrokeHandler();\n *\n *\t\t// Activate the keystroke handler.\n *\t\tkeystrokeHandler.listenTo( sourceOfEvents );\n *\n *\t\tconst cycler = new FocusCycler( {\n *\t\t\tfocusables, focusTracker, keystrokeHandler,\n *\t\t\tactions: {\n *\t\t\t\t// When arrowup of arrowleft is detected by the #keystrokeHandler,\n *\t\t\t\t// focusPrevious() will be called on the cycler.\n *\t\t\t\tfocusPrevious: [ 'arrowup', 'arrowleft' ],\n *\t\t\t}\n *\t\t} );\n */\nexport default class FocusCycler {\n\t/**\n\t * Creates an instance of the focus cycler utility.\n\t *\n\t * @param {Object} options Configuration options.\n\t * @param {module:utils/collection~Collection|Object} options.focusables\n\t * @param {module:utils/focustracker~FocusTracker} options.focusTracker\n\t * @param {module:utils/keystrokehandler~KeystrokeHandler} [options.keystrokeHandler]\n\t * @param {Object} [options.actions]\n\t */\n\tconstructor( options ) {\n\t\tObject.assign( this, options );\n\n\t\t/**\n\t\t * A {@link module:ui/view~View view} collection that the cycler operates on.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/collection~Collection} #focusables\n\t\t */\n\n\t\t/**\n\t\t * A focus tracker instance that the cycler uses to determine the current focus\n\t\t * state in {@link #focusables}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker} #focusTracker\n\t\t */\n\n\t\t/**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}\n\t\t * which can respond to certain keystrokes and cycle the focus.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler} #keystrokeHandler\n\t\t */\n\n\t\t/**\n\t\t * Actions that the cycler can take when a keystroke is pressed. Requires\n\t\t * `options.keystrokeHandler` to be passed and working. When an action is\n\t\t * performed, `preventDefault` and `stopPropagation` will be called on the event\n\t\t * the keystroke fired in the DOM.\n\t\t *\n\t\t *\t\tactions: {\n\t\t *\t\t\t// Will call #focusPrevious() when arrowleft or arrowup is pressed.\n\t\t *\t\t\tfocusPrevious: [ 'arrowleft', 'arrowup' ],\n\t\t *\n\t\t *\t\t\t// Will call #focusNext() when arrowdown is pressed.\n\t\t *\t\t\tfocusNext: 'arrowdown'\n\t\t *\t\t}\n\t\t *\n\t\t * @readonly\n\t\t * @member {Object} #actions\n\t\t */\n\n\t\tif ( options.actions && options.keystrokeHandler ) {\n\t\t\tfor ( const methodName in options.actions ) {\n\t\t\t\tlet actions = options.actions[ methodName ];\n\n\t\t\t\tif ( typeof actions == 'string' ) {\n\t\t\t\t\tactions = [ actions ];\n\t\t\t\t}\n\n\t\t\t\tfor ( const keystroke of actions ) {\n\t\t\t\t\toptions.keystrokeHandler.set( keystroke, ( data, cancel ) => {\n\t\t\t\t\t\tthis[ methodName ]();\n\t\t\t\t\t\tcancel();\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Returns the first focusable view in {@link #focusables}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #first\n\t */\n\tget first() {\n\t\treturn this.focusables.find( isFocusable ) || null;\n\t}\n\n\t/**\n\t * Returns the last focusable view in {@link #focusables}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #last\n\t */\n\tget last() {\n\t\treturn this.focusables.filter( isFocusable ).slice( -1 )[ 0 ] || null;\n\t}\n\n\t/**\n\t * Returns the next focusable view in {@link #focusables} based on {@link #current}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #next\n\t */\n\tget next() {\n\t\treturn this._getFocusableItem( 1 );\n\t}\n\n\t/**\n\t * Returns the previous focusable view in {@link #focusables} based on {@link #current}.\n\t * Returns `null` if there is none.\n\t *\n\t * @readonly\n\t * @member {module:ui/view~View|null} #previous\n\t */\n\tget previous() {\n\t\treturn this._getFocusableItem( -1 );\n\t}\n\n\t/**\n\t * An index of the view in the {@link #focusables} which is focused according\n\t * to {@link #focusTracker}. Returns `null` when there is no such view.\n\t *\n\t * @readonly\n\t * @member {Number|null} #current\n\t */\n\tget current() {\n\t\tlet index = null;\n\n\t\t// There's no focused view in the focusables.\n\t\tif ( this.focusTracker.focusedElement === null ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tthis.focusables.find( ( view, viewIndex ) => {\n\t\t\tconst focused = view.element === this.focusTracker.focusedElement;\n\n\t\t\tif ( focused ) {\n\t\t\t\tindex = viewIndex;\n\t\t\t}\n\n\t\t\treturn focused;\n\t\t} );\n\n\t\treturn index;\n\t}\n\n\t/**\n\t * Focuses the {@link #first} item in {@link #focusables}.\n\t */\n\tfocusFirst() {\n\t\tthis._focus( this.first );\n\t}\n\n\t/**\n\t * Focuses the {@link #last} item in {@link #focusables}.\n\t */\n\tfocusLast() {\n\t\tthis._focus( this.last );\n\t}\n\n\t/**\n\t * Focuses the {@link #next} item in {@link #focusables}.\n\t */\n\tfocusNext() {\n\t\tthis._focus( this.next );\n\t}\n\n\t/**\n\t * Focuses the {@link #previous} item in {@link #focusables}.\n\t */\n\tfocusPrevious() {\n\t\tthis._focus( this.previous );\n\t}\n\n\t/**\n\t * Focuses the given view if it exists.\n\t *\n\t * @protected\n\t * @param {module:ui/view~View} view\n\t */\n\t_focus( view ) {\n\t\tif ( view ) {\n\t\t\tview.focus();\n\t\t}\n\t}\n\n\t/**\n\t * Returns the next or previous focusable view in {@link #focusables} with respect\n\t * to {@link #current}.\n\t *\n\t * @protected\n\t * @param {Number} step Either `1` for checking forward from {@link #current} or\n\t * `-1` for checking backwards.\n\t * @returns {module:ui/view~View|null}\n\t */\n\t_getFocusableItem( step ) {\n\t\t// Cache for speed.\n\t\tconst current = this.current;\n\t\tconst collectionLength = this.focusables.length;\n\n\t\tif ( !collectionLength ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// Start from the beginning if no view is focused.\n\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/206\n\t\tif ( current === null ) {\n\t\t\treturn this[ step === 1 ? 'first' : 'last' ];\n\t\t}\n\n\t\t// Cycle in both directions.\n\t\tlet index = ( current + collectionLength + step ) % collectionLength;\n\n\t\tdo {\n\t\t\tconst view = this.focusables.get( index );\n\n\t\t\t// TODO: Check if view is visible.\n\t\t\tif ( isFocusable( view ) ) {\n\t\t\t\treturn view;\n\t\t\t}\n\n\t\t\t// Cycle in both directions.\n\t\t\tindex = ( index + collectionLength + step ) % collectionLength;\n\t\t} while ( index !== current );\n\n\t\treturn null;\n\t}\n}\n\n// Checks whether a view is focusable.\n//\n// @private\n// @param {module:ui/view~View} view A view to be checked.\n// @returns {Boolean}\nfunction isFocusable( view ) {\n\treturn !!( view.focus && global.window.getComputedStyle( view.element ).display != 'none' );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/toolbar/toolbarseparatorview\n */\n\nimport View from '../view';\n\n/**\n * The toolbar separator view class.\n *\n * @extends module:ui/view~View\n */\nexport default class ToolbarSeparatorView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-toolbar__separator'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/toolbar/toolbarview\n */\n\nimport View from '../view';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '../focuscycler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport ToolbarSeparatorView from './toolbarseparatorview';\nimport preventDefault from '../bindings/preventdefault.js';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\n\nimport '../../theme/components/toolbar/toolbar.css';\n\n/**\n * The toolbar view class.\n *\n * @extends module:ui/view~View\n * @implements module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable\n */\nexport default class ToolbarView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Collection of the toolbar items (like buttons).\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.items = this.createCollection();\n\n\t\t/**\n\t\t * Tracks information about DOM focus in the list.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * Instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\t/**\n\t\t * Controls the orientation of toolbar items.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isVertical\n\t\t */\n\t\tthis.set( 'isVertical', false );\n\n\t\t/**\n\t\t * An additional CSS class added to the {@link #element}.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #className\n\t\t */\n\t\tthis.set( 'className' );\n\n\t\t/**\n\t\t * Helps cycling over focusable {@link #items} in the toolbar.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n\t\tthis._focusCycler = new FocusCycler( {\n\t\t\tfocusables: this.items,\n\t\t\tfocusTracker: this.focusTracker,\n\t\t\tkeystrokeHandler: this.keystrokes,\n\t\t\tactions: {\n\t\t\t\t// Navigate toolbar items backwards using the arrow[left,up] keys.\n\t\t\t\tfocusPrevious: [ 'arrowleft', 'arrowup' ],\n\n\t\t\t\t// Navigate toolbar items forwards using the arrow[right,down] keys.\n\t\t\t\tfocusNext: [ 'arrowright', 'arrowdown' ]\n\t\t\t}\n\t\t} );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-toolbar',\n\t\t\t\t\tbind.if( 'isVertical', 'ck-toolbar_vertical' ),\n\t\t\t\t\tbind.to( 'className' )\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.items,\n\n\t\t\ton: {\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/206\n\t\t\t\tmousedown: preventDefault( this )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Items added before rendering should be known to the #focusTracker.\n\t\tfor ( const item of this.items ) {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t}\n\n\t\tthis.items.on( 'add', ( evt, item ) => {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t} );\n\n\t\tthis.items.on( 'remove', ( evt, item ) => {\n\t\t\tthis.focusTracker.remove( item.element );\n\t\t} );\n\n\t\t// Start listening for the keystrokes coming from #element.\n\t\tthis.keystrokes.listenTo( this.element );\n\t}\n\n\t/**\n\t * Focuses the first focusable in {@link #items}.\n\t */\n\tfocus() {\n\t\tthis._focusCycler.focusFirst();\n\t}\n\n\t/**\n\t * Focuses the last focusable in {@link #items}.\n\t */\n\tfocusLast() {\n\t\tthis._focusCycler.focusLast();\n\t}\n\n\t/**\n\t * A utility which expands a plain toolbar configuration into\n\t * {@link module:ui/toolbar/toolbarview~ToolbarView#items} using a given component factory.\n\t *\n\t * @param {Array.<String>} config The toolbar items config.\n\t * @param {module:ui/componentfactory~ComponentFactory} factory A factory producing toolbar items.\n\t */\n\tfillFromConfig( config, factory ) {\n\t\tconfig.map( name => {\n\t\t\tif ( name == '|' ) {\n\t\t\t\tthis.items.add( new ToolbarSeparatorView() );\n\t\t\t} else if ( factory.has( name ) ) {\n\t\t\t\tthis.items.add( factory.create( name ) );\n\t\t\t} else {\n\t\t\t\t/**\n\t\t\t\t * There was a problem processing the configuration of the toolbar. The item with the given\n\t\t\t\t * name does not exist so it was omitted when rendering the toolbar.\n\t\t\t\t *\n\t\t\t\t * This warning usually shows up when the {@link module:core/plugin~Plugin} which is supposed\n\t\t\t\t * to provide a toolbar item has not been loaded or there is a typo in the configuration.\n\t\t\t\t *\n\t\t\t\t * Make sure the plugin responsible for this toolbar item is loaded and the toolbar configuration\n\t\t\t\t * is correct, e.g. {@link module:basic-styles/bold~Bold} is loaded for the `'bold'` toolbar item.\n\t\t\t\t *\n\t\t\t\t * You can use the following snippet to retrieve all available toolbar items:\n\t\t\t\t *\n\t\t\t\t *\t\tArray.from( editor.ui.componentFactory.names() );\n\t\t\t\t *\n\t\t\t\t * @error toolbarview-item-unavailable\n\t\t\t\t * @param {String} name The name of the component.\n\t\t\t\t */\n\t\t\t\tlog.warn(\n\t\t\t\t\t'toolbarview-item-unavailable: The requested toolbar item is unavailable.',\n\t\t\t\t\t{ name }\n\t\t\t\t);\n\t\t\t}\n\t\t} );\n\t}\n}\n\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/bindings/preventdefault\n */\n\n/**\n * A helper which executes a native `Event.preventDefault()` if the target of an event equals the\n * {@link module:ui/view~View#element element of the view}. It shortens the definition of a\n * {@link module:ui/view~View#template template}.\n *\n *\t\t// In a class extending View.\n *\t\timport preventDefault from '@ckeditor/ckeditor5-ui/src/bindings/preventdefault';\n *\n *\t\t// ...\n *\n *\t\tthis.setTemplate( {\n *\t\t\ttag: 'div',\n *\n *\t\t\ton: {\n *\t\t\t\t// Prevent the default mousedown action on this view.\n *\t\t\t\tmousedown: preventDefault( this )\n *\t\t\t}\n *\t\t} );\n *\n * @param {module:ui/view~View} view View instance that defines the template.\n * @returns {module:ui/template~TemplateToBinding}\n */\nexport default function preventDefault( view ) {\n\treturn view.bindTemplate.to( evt => {\n\t\tif ( evt.target === view.element ) {\n\t\t\tevt.preventDefault();\n\t\t}\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module editor-classic/classiceditoruiview\n */\n\nimport BoxedEditorUIView from '@ckeditor/ckeditor5-ui/src/editorui/boxed/boxededitoruiview';\nimport InlineEditableUIView from '@ckeditor/ckeditor5-ui/src/editableui/inline/inlineeditableuiview';\nimport StickyPanelView from '@ckeditor/ckeditor5-ui/src/panel/sticky/stickypanelview';\nimport ToolbarView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarview';\n\nimport '../theme/classiceditor.css';\n\n/**\n * Classic editor UI view. Uses an inline editable and a sticky toolbar, all\n * enclosed in a boxed UI view.\n *\n * @extends module:ui/editorui/boxed/boxededitoruiview~BoxedEditorUIView\n */\nexport default class ClassicEditorUIView extends BoxedEditorUIView {\n\t/**\n\t * Creates an instance of the classic editor UI view.\n\t *\n\t * @param {module:utils/locale~Locale} locale The {@link module:core/editor/editor~Editor#locale} instance.\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Sticky panel view instance. This is a parent view of a {@link #toolbar}\n\t\t * that makes toolbar sticky.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/panel/sticky/stickypanelview~StickyPanelView}\n\t\t */\n\t\tthis.stickyPanel = new StickyPanelView( locale );\n\n\t\t/**\n\t\t * Toolbar view instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarView}\n\t\t */\n\t\tthis.toolbar = new ToolbarView( locale );\n\n\t\t/**\n\t\t * Editable UI view.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/editableui/inline/inlineeditableuiview~InlineEditableUIView}\n\t\t */\n\t\tthis.editable = new InlineEditableUIView( locale );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Set toolbar as a child of a stickyPanel and makes toolbar sticky.\n\t\tthis.stickyPanel.content.add( this.toolbar );\n\n\t\tthis.top.add( this.stickyPanel );\n\t\tthis.main.add( this.editable );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget editableElement() {\n\t\treturn this.editable.element;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/elementreplacer\n */\n\n/**\n * Utility class allowing to hide existing HTML elements or replace them with given ones in a way that doesn't remove\n * the original elements from the DOM.\n */\nexport default class ElementReplacer {\n\tconstructor() {\n\t\t/**\n\t\t * The elements replaced by {@link #replace} and their replacements.\n\t\t *\n\t\t * @private\n\t\t * @member {Array.<Object>}\n\t\t */\n\t\tthis._replacedElements = [];\n\t}\n\n\t/**\n\t * Hides the `element` and, if specified, inserts the the given element next to it.\n\t *\n\t * The effect of this method can be reverted by {@link #restore}.\n\t *\n\t * @param {HTMLElement} element The element to replace.\n\t * @param {HTMLElement} [newElement] The replacement element. If not passed, then the `element` will just be hidden.\n\t */\n\treplace( element, newElement ) {\n\t\tthis._replacedElements.push( { element, newElement } );\n\n\t\telement.style.display = 'none';\n\n\t\tif ( newElement ) {\n\t\t\telement.parentNode.insertBefore( newElement, element.nextSibling );\n\t\t}\n\t}\n\n\t/**\n\t * Restores what {@link #replace} did.\n\t */\n\trestore() {\n\t\tthis._replacedElements.forEach( ( { element, newElement } ) => {\n\t\t\telement.style.display = '';\n\n\t\t\tif ( newElement ) {\n\t\t\t\tnewElement.remove();\n\t\t\t}\n\t\t} );\n\n\t\tthis._replacedElements = [];\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module editor-classic/classiceditor\n */\n\nimport Editor from '@ckeditor/ckeditor5-core/src/editor/editor';\nimport DataApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/dataapimixin';\nimport ElementApiMixin from '@ckeditor/ckeditor5-core/src/editor/utils/elementapimixin';\nimport attachToForm from '@ckeditor/ckeditor5-core/src/editor/utils/attachtoform';\nimport HtmlDataProcessor from '@ckeditor/ckeditor5-engine/src/dataprocessor/htmldataprocessor';\nimport ClassicEditorUI from './classiceditorui';\nimport ClassicEditorUIView from './classiceditoruiview';\nimport ElementReplacer from '@ckeditor/ckeditor5-utils/src/elementreplacer';\nimport getDataFromElement from '@ckeditor/ckeditor5-utils/src/dom/getdatafromelement';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isElement from '@ckeditor/ckeditor5-utils/src/lib/lodash/isElement';\n\n/**\n * The {@glink builds/guides/overview#classic-editor classic editor} implementation.\n * It uses an inline editable and a sticky toolbar, all enclosed in a boxed UI.\n * See the {@glink examples/builds/classic-editor demo}.\n *\n * In order to create a classic editor instance, use the static\n * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`} method.\n *\n * # Classic editor and classic build\n *\n * The classic editor can be used directly from source (if you installed the\n * [`@ckeditor/ckeditor5-editor-classic`](https://www.npmjs.com/package/@ckeditor/ckeditor5-editor-classic) package)\n * but it is also available in the {@glink builds/guides/overview#classic-editor classic build}.\n *\n * {@glink builds/guides/overview Builds} are ready-to-use editors with plugins bundled in. When using the editor from\n * source you need to take care of loading all plugins by yourself\n * (through the {@link module:core/editor/editorconfig~EditorConfig#plugins `config.plugins`} option).\n * Using the editor from source gives much better flexibility and allows easier customization.\n *\n * Read more about initializing the editor from source or as a build in\n * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}.\n *\n * @mixes module:core/editor/utils/dataapimixin~DataApiMixin\n * @mixes module:core/editor/utils/elementapimixin~ElementApiMixin\n * @implements module:core/editor/editorwithui~EditorWithUI\n * @extends module:core/editor/editor~Editor\n */\nexport default class ClassicEditor extends Editor {\n\t/**\n\t * Creates an instance of the classic editor.\n\t *\n\t * **Note:** do not use the constructor to create editor instances. Use the static\n\t * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`} method instead.\n\t *\n\t * @protected\n\t * @param {HTMLElement|String} sourceElementOrData The DOM element that will be the source for the created editor\n\t * or the editor's initial data. For more information see\n\t * {@link module:editor-classic/classiceditor~ClassicEditor.create `ClassicEditor.create()`}.\n\t * @param {module:core/editor/editorconfig~EditorConfig} config The editor configuration.\n\t */\n\tconstructor( sourceElementOrData, config ) {\n\t\tsuper( config );\n\n\t\tif ( isElement( sourceElementOrData ) ) {\n\t\t\tthis.sourceElement = sourceElementOrData;\n\t\t}\n\n\t\t/**\n\t\t * The element replacer instance used to hide the editor's source element.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:utils/elementreplacer~ElementReplacer}\n\t\t */\n\t\tthis._elementReplacer = new ElementReplacer();\n\n\t\tthis.data.processor = new HtmlDataProcessor();\n\n\t\tthis.model.document.createRoot();\n\n\t\tthis.ui = new ClassicEditorUI( this, new ClassicEditorUIView( this.locale ) );\n\n\t\tattachToForm( this );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget element() {\n\t\treturn this.ui.view.element;\n\t}\n\n\t/**\n\t * Destroys the editor instance, releasing all resources used by it.\n\t *\n\t * Updates the editor's source element with the data.\n\t *\n\t * @returns {Promise}\n\t */\n\tdestroy() {\n\t\tif ( this.sourceElement ) {\n\t\t\tthis.updateSourceElement();\n\t\t}\n\n\t\tthis._elementReplacer.restore();\n\t\tthis.ui.destroy();\n\n\t\treturn super.destroy();\n\t}\n\n\t/**\n\t * Creates a classic editor instance.\n\t *\n\t * Creating an instance when using a {@glink builds/index CKEditor build}:\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ) )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * Creating an instance when using CKEditor from source (make sure to specify the list of plugins to load and the toolbar):\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\t\timport ...\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( document.querySelector( '#editor' ), {\n\t *\t\t\t\tplugins: [ Essentials, Bold, Italic, ... ],\n\t *\t\t\t\ttoolbar: [ 'bold', 'italic', ... ]\n\t *\t\t\t} )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * Creating an instance when using initial data instead of a DOM element:\n\t *\n\t *\t\timport ClassicEditor from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';\n\t *\t\timport Essentials from '@ckeditor/ckeditor5-essentials/src/essentials';\n\t *\t\timport Bold from '@ckeditor/ckeditor5-basic-styles/src/bold';\n\t *\t\timport Italic from '@ckeditor/ckeditor5-basic-styles/src/italic';\n\t *\t\timport ...\n\t *\n\t *\t\tClassicEditor\n\t *\t\t\t.create( '<p>Hello world!</p>' )\n\t *\t\t\t.then( editor => {\n\t *\t\t\t\tconsole.log( 'Editor was initialized', editor );\n\t *\n\t *\t\t\t\t// Initial data was provided so `editor.element` needs to be added manually to the DOM.\n\t *\t\t\t\tdocument.body.appendChild( editor.element );\n\t *\t\t\t} )\n\t *\t\t\t.catch( err => {\n\t *\t\t\t\tconsole.error( err.stack );\n\t *\t\t\t} );\n\t *\n\t * @param {HTMLElement|String} sourceElementOrData The DOM element that will be the source for the created editor\n\t * or the editor's initial data.\n\t *\n\t * If a source element is passed, then its contents will be automatically\n\t * {@link module:editor-classic/classiceditor~ClassicEditor#setData loaded} to the editor on startup\n\t * and the {@link module:core/editor/editorwithui~EditorWithUI#element editor element} will replace the passed element in the DOM\n\t * (the original one will be hidden and the editor will be injected next to it).\n\t *\n\t * Moreover, the data will be set back to the source element once the editor is destroyed and\n\t * (if the element is a `<textarea>`) when a form in which this element is contained is submitted (which ensures\n\t * automatic integration with native web forms).\n\t *\n\t * If the data is passed, a detached editor will be created. It means that you need to insert it into the DOM manually\n\t * (by accessing the {@link module:editor-classic/classiceditor~ClassicEditor#element `editor.element`} property).\n\t *\n\t * See the examples above to learn more.\n\t *\n\t * @param {module:core/editor/editorconfig~EditorConfig} config The editor configuration.\n\t * @returns {Promise} A promise resolved once the editor is ready.\n\t * The promise returns the created {@link module:editor-classic/classiceditor~ClassicEditor} instance.\n\t */\n\tstatic create( sourceElementOrData, config ) {\n\t\treturn new Promise( resolve => {\n\t\t\tconst editor = new this( sourceElementOrData, config );\n\n\t\t\tresolve(\n\t\t\t\teditor.initPlugins()\n\t\t\t\t\t.then( () => editor.ui.init() )\n\t\t\t\t\t.then( () => {\n\t\t\t\t\t\tif ( isElement( sourceElementOrData ) ) {\n\t\t\t\t\t\t\teditor._elementReplacer.replace( sourceElementOrData, editor.element );\n\t\t\t\t\t\t}\n\n\t\t\t\t\t\teditor.fire( 'uiReady' );\n\t\t\t\t\t} )\n\t\t\t\t\t.then( () => editor.editing.view.attachDomRoot( editor.ui.view.editableElement ) )\n\t\t\t\t\t.then( () => {\n\t\t\t\t\t\tconst initialData = isElement( sourceElementOrData ) ?\n\t\t\t\t\t\t\tgetDataFromElement( sourceElementOrData ) :\n\t\t\t\t\t\t\tsourceElementOrData;\n\n\t\t\t\t\t\treturn editor.data.init( initialData );\n\t\t\t\t\t} )\n\t\t\t\t\t.then( () => {\n\t\t\t\t\t\teditor.fire( 'dataReady' );\n\t\t\t\t\t\teditor.fire( 'ready' );\n\t\t\t\t\t} )\n\t\t\t\t\t.then( () => editor )\n\t\t\t);\n\t\t} );\n\t}\n}\n\nmix( ClassicEditor, DataApiMixin );\nmix( ClassicEditor, ElementApiMixin );\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport isFunction from '@ckeditor/ckeditor5-utils/src/lib/lodash/isFunction';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * @module core/editor/utils/attachtoform\n */\n\n/**\n * Checks if the editor is initialized on a `<textarea>` element that belongs to a form. If yes, it updates the editor's element\n * content before submitting the form.\n *\n * This helper requires the {@link module:core/editor/utils/elementapimixin~ElementApi ElementApi interface}.\n *\n * @param {module:core/editor/editor~Editor} editor Editor instance.\n */\nexport default function attachToForm( editor ) {\n\tif ( !isFunction( editor.updateSourceElement ) ) {\n\t\t/**\n\t\t * The editor passed to `attachToForm()` must implement the\n\t\t * {@link module:core/editor/utils/elementapimixin~ElementApi} interface.\n\t\t *\n\t\t * @error attachtoform-missing-elementapi-interface\n\t\t */\n\t\tthrow new CKEditorError( 'attachtoform-missing-elementapi-interface: Editor passed to attachToForm() must implement ElementApi.' );\n\t}\n\n\tconst sourceElement = editor.sourceElement;\n\n\t// Only when replacing a textarea which is inside of a form element.\n\tif ( sourceElement && sourceElement.tagName.toLowerCase() === 'textarea' && sourceElement.form ) {\n\t\tlet originalSubmit;\n\t\tconst form = sourceElement.form;\n\t\tconst onSubmit = () => editor.updateSourceElement();\n\n\t\t// Replace the original form#submit() to call a custom submit function first.\n\t\t// Check if #submit is a function because the form might have an input named \"submit\".\n\t\tif ( isFunction( form.submit ) ) {\n\t\t\toriginalSubmit = form.submit;\n\n\t\t\tform.submit = () => {\n\t\t\t\tonSubmit();\n\t\t\t\toriginalSubmit.apply( form );\n\t\t\t};\n\t\t}\n\n\t\t// Update the replaced textarea with data before each form#submit event.\n\t\tform.addEventListener( 'submit', onSubmit );\n\n\t\t// Remove the submit listener and revert the original submit method on\n\t\t// editor#destroy.\n\t\teditor.on( 'destroy', () => {\n\t\t\tform.removeEventListener( 'submit', onSubmit );\n\n\t\t\tif ( originalSubmit ) {\n\t\t\t\tform.submit = originalSubmit;\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals HTMLTextAreaElement */\n\n/**\n * @module utils/dom/getdatafromelement\n */\n\n/**\n * Gets data from a given source element.\n *\n * @param {HTMLElement} el The element from which the data will be retrieved.\n * @returns {String} The data string.\n */\nexport default function getDataFromElement( el ) {\n\tif ( el instanceof HTMLTextAreaElement ) {\n\t\treturn el.value;\n\t}\n\n\treturn el.innerHTML;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* global DOMParser */\n\n/**\n * @module ui/icon/iconview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/icon/icon.css';\n\n/**\n * The icon view class.\n *\n * @extends module:ui/view~View\n */\nexport default class IconView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor() {\n\t\tsuper();\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * The SVG source of the icon.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #content\n\t\t */\n\t\tthis.set( 'content', '' );\n\n\t\t/**\n\t\t * This attribute specifies the boundaries to which the\n\t\t * icon content should stretch.\n\t\t *\n\t\t * @observable\n\t\t * @default '0 0 20 20'\n\t\t * @member {String} #viewBox\n\t\t */\n\t\tthis.set( 'viewBox', '0 0 20 20' );\n\n\t\t/**\n\t\t * The fill color of the child `path.ck-icon__fill`.\n\t\t *\n\t\t * @observable\n\t\t * @default ''\n\t\t * @member {String} #fillColor\n\t\t */\n\t\tthis.set( 'fillColor', '' );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'svg',\n\t\t\tns: 'http://www.w3.org/2000/svg',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-icon'\n\t\t\t\t],\n\t\t\t\tviewBox: bind.to( 'viewBox' )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis._updateXMLContent();\n\t\tthis._colorFillPaths();\n\n\t\t// This is a hack for lack of innerHTML binding.\n\t\t// See: https://github.com/ckeditor/ckeditor5-ui/issues/99.\n\t\tthis.on( 'change:content', () => {\n\t\t\tthis._updateXMLContent();\n\t\t\tthis._colorFillPaths();\n\t\t} );\n\n\t\tthis.on( 'change:fillColor', () => {\n\t\t\tthis._colorFillPaths();\n\t\t} );\n\t}\n\n\t/**\n\t * Updates the {@link #element} with the value of {@link #content}.\n\t *\n\t * @private\n\t */\n\t_updateXMLContent() {\n\t\tif ( this.content ) {\n\t\t\tconst parsed = new DOMParser().parseFromString( this.content.trim(), 'image/svg+xml' );\n\t\t\tconst svg = parsed.querySelector( 'svg' );\n\t\t\tconst viewBox = svg.getAttribute( 'viewBox' );\n\n\t\t\tif ( viewBox ) {\n\t\t\t\tthis.viewBox = viewBox;\n\t\t\t}\n\n\t\t\tthis.element.innerHTML = '';\n\n\t\t\twhile ( svg.childNodes.length > 0 ) {\n\t\t\t\tthis.element.appendChild( svg.childNodes[ 0 ] );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Fills all child `path.ck-icon__fill` with the `#fillColor`.\n\t *\n\t * @private\n\t */\n\t_colorFillPaths() {\n\t\tif ( this.fillColor ) {\n\t\t\tthis.element.querySelectorAll( '.ck-icon__fill' ).forEach( path => {\n\t\t\t\tpath.style.fill = this.fillColor;\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/tooltip/tooltipview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/tooltip/tooltip.css';\n\n/**\n * The tooltip view class.\n *\n * @extends module:ui/view~View\n */\nexport default class TooltipView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The text of the tooltip visible to the user.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #text\n\t\t */\n\t\tthis.set( 'text', '' );\n\n\t\t/**\n\t\t * The position of the tooltip (south or north).\n\t\t *\n\t\t *\t\t+-----------+\n\t\t *\t\t|   north   |\n\t\t *\t\t+-----------+\n\t\t *\t\t      V\n\t\t *\t\t  [element]\n\t\t *\n\t\t *\t\t  [element]\n\t\t *\t\t      ^\n\t\t *\t\t+-----------+\n\t\t *\t\t|   south   |\n\t\t *\t\t+-----------+\n\t\t *\n\t\t * @observable\n\t\t * @default 's'\n\t\t * @member {'s'|'n'} #position\n\t\t */\n\t\tthis.set( 'position', 's' );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-tooltip',\n\t\t\t\t\tbind.to( 'position', position => 'ck-tooltip_' + position ),\n\t\t\t\t\tbind.if( 'text', 'ck-hidden', value => !value.trim() )\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'span',\n\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-tooltip__text'\n\t\t\t\t\t\t]\n\t\t\t\t\t},\n\n\t\t\t\t\tchildren: [\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\ttext: bind.to( 'text' ),\n\t\t\t\t\t\t}\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/button/buttonview\n */\n\nimport View from '../view';\nimport IconView from '../icon/iconview';\nimport TooltipView from '../tooltip/tooltipview';\n\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\nimport { getEnvKeystrokeText } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\nimport '../../theme/components/button/button.css';\n\n/**\n * The button view class.\n *\n *\t\tconst view = new ButtonView();\n *\n *\t\tview.set( {\n *\t\t\tlabel: 'A button',\n *\t\t\tkeystroke: 'Ctrl+B',\n *\t\t\ttooltip: true,\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * @extends module:ui/view~View\n * @implements module:ui/button/button~Button\n */\nexport default class ButtonView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\t\tconst ariaLabelUid = uid();\n\n\t\t// Implement the Button interface.\n\t\tthis.set( 'class' );\n\t\tthis.set( 'labelStyle' );\n\t\tthis.set( 'icon' );\n\t\tthis.set( 'isEnabled', true );\n\t\tthis.set( 'isOn', false );\n\t\tthis.set( 'isVisible', true );\n\t\tthis.set( 'keystroke' );\n\t\tthis.set( 'label' );\n\t\tthis.set( 'tabindex', -1 );\n\t\tthis.set( 'tooltip' );\n\t\tthis.set( 'tooltipPosition', 's' );\n\t\tthis.set( 'type', 'button' );\n\t\tthis.set( 'withText', false );\n\n\t\t/**\n\t\t * Collection of the child views inside of the button {@link #element}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\t/**\n\t\t * Tooltip of the button view. It is configurable using the {@link #tooltip tooltip attribute}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/tooltip/tooltipview~TooltipView} #tooltipView\n\t\t */\n\t\tthis.tooltipView = this._createTooltipView();\n\n\t\t/**\n\t\t * Label of the button view. It is configurable using the {@link #label label attribute}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #labelView\n\t\t */\n\t\tthis.labelView = this._createLabelView( ariaLabelUid );\n\n\t\t/**\n\t\t * The icon view of the button. Will be added to {@link #children} when the\n\t\t * {@link #icon icon attribute} is defined.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/icon/iconview~IconView} #iconView\n\t\t */\n\t\tthis.iconView = new IconView();\n\n\t\tthis.iconView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-button__icon'\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * Tooltip of the button bound to the template.\n\t\t *\n\t\t * @see #tooltip\n\t\t * @see #_getTooltipString\n\t\t * @private\n\t\t * @observable\n\t\t * @member {Boolean} #_tooltipString\n\t\t */\n\t\tthis.bind( '_tooltipString' ).to(\n\t\t\tthis, 'tooltip',\n\t\t\tthis, 'label',\n\t\t\tthis, 'keystroke',\n\t\t\tthis._getTooltipString.bind( this )\n\t\t);\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'button',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button',\n\t\t\t\t\tbind.to( 'class' ),\n\t\t\t\t\tbind.if( 'isEnabled', 'ck-disabled', value => !value ),\n\t\t\t\t\tbind.if( 'isVisible', 'ck-hidden', value => !value ),\n\t\t\t\t\tbind.to( 'isOn', value => value ? 'ck-on' : 'ck-off' ),\n\t\t\t\t\tbind.if( 'withText', 'ck-button_with-text' )\n\t\t\t\t],\n\t\t\t\ttype: bind.to( 'type', value => value ? value : 'button' ),\n\t\t\t\ttabindex: bind.to( 'tabindex' ),\n\t\t\t\t'aria-labelledby': `ck-editor__aria-label_${ ariaLabelUid }`,\n\t\t\t\t'aria-disabled': bind.if( 'isEnabled', true, value => !value ),\n\t\t\t\t'aria-pressed': bind.if( 'isOn', true )\n\t\t\t},\n\n\t\t\tchildren: this.children,\n\n\t\t\ton: {\n\t\t\t\tmousedown: bind.to( evt => {\n\t\t\t\t\tevt.preventDefault();\n\t\t\t\t} ),\n\n\t\t\t\tclick: bind.to( evt => {\n\t\t\t\t\t// We can't make the button disabled using the disabled attribute, because it won't be focusable.\n\t\t\t\t\t// Though, shouldn't this condition be moved to the button controller?\n\t\t\t\t\tif ( this.isEnabled ) {\n\t\t\t\t\t\tthis.fire( 'execute' );\n\t\t\t\t\t} else {\n\t\t\t\t\t\t// Prevent the default when button is disabled, to block e.g.\n\t\t\t\t\t\t// automatic form submitting. See ckeditor/ckeditor5-link#74.\n\t\t\t\t\t\tevt.preventDefault();\n\t\t\t\t\t}\n\t\t\t\t} )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tif ( this.icon ) {\n\t\t\tthis.iconView.bind( 'content' ).to( this, 'icon' );\n\t\t\tthis.children.add( this.iconView );\n\t\t}\n\n\t\tthis.children.add( this.tooltipView );\n\t\tthis.children.add( this.labelView );\n\t}\n\n\t/**\n\t * Focuses the {@link #element} of the button.\n\t */\n\tfocus() {\n\t\tthis.element.focus();\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/tooltip/tooltipview~TooltipView} instance and binds it with button\n\t * attributes.\n\t *\n\t * @private\n\t * @returns {module:ui/tooltip/tooltipview~TooltipView}\n\t */\n\t_createTooltipView() {\n\t\tconst tooltipView = new TooltipView();\n\n\t\ttooltipView.bind( 'text' ).to( this, '_tooltipString' );\n\t\ttooltipView.bind( 'position' ).to( this, 'tooltipPosition' );\n\n\t\treturn tooltipView;\n\t}\n\n\t/**\n\t * Creates a label view instance and binds it with button attributes.\n\t *\n\t * @private\n\t * @param {String} ariaLabelUid The aria label UID.\n\t * @returns {module:ui/view~View}\n\t */\n\t_createLabelView( ariaLabelUid ) {\n\t\tconst labelView = new View();\n\t\tconst bind = this.bindTemplate;\n\n\t\tlabelView.setTemplate( {\n\t\t\ttag: 'span',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button__label'\n\t\t\t\t],\n\t\t\t\tstyle: bind.to( 'labelStyle' ),\n\t\t\t\tid: `ck-editor__aria-label_${ ariaLabelUid }`,\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttext: this.bindTemplate.to( 'label' )\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\treturn labelView;\n\t}\n\n\t/**\n\t * Gets the text for the {@link #tooltipView} from the combination of\n\t * {@link #tooltip}, {@link #label} and {@link #keystroke} attributes.\n\t *\n\t * @private\n\t * @see #tooltip\n\t * @see #_tooltipString\n\t * @param {Boolean|String|Function} tooltip Button tooltip.\n\t * @param {String} label Button label.\n\t * @param {String} keystroke Button keystroke.\n\t * @returns {String}\n\t */\n\t_getTooltipString( tooltip, label, keystroke ) {\n\t\tif ( tooltip ) {\n\t\t\tif ( typeof tooltip == 'string' ) {\n\t\t\t\treturn tooltip;\n\t\t\t} else {\n\t\t\t\tif ( keystroke ) {\n\t\t\t\t\tkeystroke = getEnvKeystrokeText( keystroke );\n\t\t\t\t}\n\n\t\t\t\tif ( tooltip instanceof Function ) {\n\t\t\t\t\treturn tooltip( label, keystroke );\n\t\t\t\t} else {\n\t\t\t\t\treturn `${ label }${ keystroke ? ` (${ keystroke })` : '' }`;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn '';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/plugin\n */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The base class for CKEditor plugin classes.\n *\n * @implements module:core/plugin~PluginInterface\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor instance.\n\t\t *\n\t\t * Note that most editors implement the {@link module:core/editor/editorwithui~EditorWithUI} interface in addition\n\t\t * to the base {@link module:core/editor/editor~Editor} interface. However, editors with an external UI\n\t\t * (i.e. Bootstrap-based) or a headless editor may not implement the {@link module:core/editor/editorwithui~EditorWithUI}\n\t\t * interface.\n\t\t *\n\t\t * Because of above, to make plugins more universal, it is recommended to split features into:\n\t\t *  - The \"editing\" part that only uses the {@link module:core/editor/editor~Editor} interface.\n\t\t *  - The \"UI\" part that uses both the {@link module:core/editor/editor~Editor} interface and\n\t\t *  the {@link module:core/editor/editorwithui~EditorWithUI} interface.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n}\n\nmix( Plugin, ObservableMixin );\n\n/**\n * The base interface for CKEditor plugins.\n *\n * In its minimal form it can be a simple function (it will be used as a constructor) that accepts\n * {@link module:core/editor/editor~Editor the editor} as a parameter.\n * It can also implement a few methods which, when present, will be used to properly initialize and destroy the plugin.\n *\n *\t\t// A simple plugin that enables a data processor.\n *\t\tfunction MyPlugin( editor ) {\n *\t\t\teditor.data.processor = new MyDataProcessor();\n *\t\t}\n *\n * In most cases, however, you will want to inherit from the {@link module:core/plugin~Plugin} class which implements the\n * {@link module:utils/observablemixin~ObservableMixin} and is, therefore, more convenient:\n *\n *\t\tclass MyPlugin extends Plugin {\n *\t\t\tinit() {\n *\t\t\t\t// `listenTo()` and `editor` are available thanks to `Plugin`.\n *\t\t\t\t// By using `listenTo()` you will ensure that the listener is removed when\n *\t\t\t\t// the plugin is destroyed.\n *\t\t\t\tthis.listenTo( this.editor, 'dataReady', () => {\n *\t\t\t\t\t// Do something when the data is ready.\n *\t\t\t\t} );\n *\t\t\t}\n *\t\t}\n *\n * @interface PluginInterface\n */\n\n/**\n * Creates a new plugin instance. This is the first step of the plugin initialization.\n * See also {@link #init} and {@link #afterInit}.\n *\n * A plugin is always instantiated after its {@link module:core/plugin~PluginInterface.requires dependencies} and the\n * {@link #init} and {@link #afterInit} methods are called in the same order.\n *\n * Usually, you will want to put your plugin's initialization code in the {@link #init} method.\n * The constructor can be understood as \"before init\" and used in special cases, just like\n * {@link #afterInit} serves the special \"after init\" scenarios (e.g.the code which depends on other\n * plugins, but which does not {@link module:core/plugin~PluginInterface.requires explicitly require} them).\n *\n * @method #constructor\n * @param {module:core/editor/editor~Editor} editor\n */\n\n/**\n * An array of plugins required by this plugin.\n *\n * To keep the plugin class definition tight it is recommended to define this property as a static getter:\n *\n *\t\timport Image from './image.js';\n *\n *\t\texport default class ImageCaption {\n *\t\t\tstatic get requires() {\n *\t\t\t\treturn [ Image ];\n *\t\t\t}\n *\t\t}\n *\n * @static\n * @readonly\n * @member {Array.<Function>|undefined} module:core/plugin~PluginInterface.requires\n */\n\n/**\n * An optional name of the plugin. If set, the plugin will be available in\n * {@link module:core/plugincollection~PluginCollection#get} by its\n * name and its constructor. If not, then only by its constructor.\n *\n * The name should reflect the constructor name.\n *\n * To keep the plugin class definition tight it is recommended to define this property as a static getter:\n *\n *\t\texport default class ImageCaption {\n *\t\t\tstatic get pluginName() {\n *\t\t\t\treturn 'ImageCaption';\n *\t\t\t}\n *\t\t}\n *\n * Note: The native `Function.name` property could not be used to keep the plugin name because\n * it will be mangled during code minification.\n *\n * Naming a plugin is necessary to enable removing it through the\n * {@link module:core/editor/editorconfig~EditorConfig#removePlugins `config.removePlugins`} option.\n *\n * @static\n * @readonly\n * @member {String|undefined} module:core/plugin~PluginInterface.pluginName\n */\n\n/**\n * The second stage (after plugin {@link #constructor}) of plugin initialization.\n * Unlike the plugin constructor this method can be asynchronous.\n *\n * A plugin's `init()` method is called after its {@link module:core/plugin~PluginInterface.requires dependencies} are initialized,\n * so in the same order as constructors of these plugins.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #init\n * @returns {null|Promise}\n */\n\n/**\n * The third (and last) stage of plugin initialization. See also {@link #constructor} and {@link #init}.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #afterInit\n * @returns {null|Promise}\n */\n\n/**\n * Destroys the plugin.\n *\n * **Note:** This method is optional. A plugin instance does not need to have it defined.\n *\n * @method #destroy\n * @returns {null|Promise}\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module widget/highlightstack\n */\n\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * Class used to handle correct order of highlights on elements.\n *\n * When different highlights are applied to same element correct order should be preserved:\n *\n * * highlight with highest priority should be applied,\n * * if two highlights have same priority - sort by CSS class provided in\n * {@link module:engine/conversion/downcast-converters~HighlightDescriptor}.\n *\n * This way, highlight will be applied with the same rules it is applied on texts.\n */\nexport default class HighlightStack {\n\t/**\n\t * Creates class instance.\n\t */\n\tconstructor() {\n\t\tthis._stack = [];\n\t}\n\n\t/**\n\t * Adds highlight descriptor to the stack.\n\t *\n\t * @fires change:top\n\t * @param {module:engine/conversion/downcast-converters~HighlightDescriptor} descriptor\n\t * @param {module:engine/view/writer~Writer} writer\n\t */\n\tadd( descriptor, writer ) {\n\t\tconst stack = this._stack;\n\n\t\t// Save top descriptor and insert new one. If top is changed - fire event.\n\t\tconst oldTop = stack[ 0 ];\n\t\tthis._insertDescriptor( descriptor );\n\t\tconst newTop = stack[ 0 ];\n\n\t\t// When new object is at the top and stores different information.\n\t\tif ( oldTop !== newTop && !compareDescriptors( oldTop, newTop ) ) {\n\t\t\tthis.fire( 'change:top', {\n\t\t\t\toldDescriptor: oldTop,\n\t\t\t\tnewDescriptor: newTop,\n\t\t\t\twriter\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Removes highlight descriptor from the stack.\n\t *\n\t * @fires change:top\n\t * @param {String} id Id of the descriptor to remove.\n\t * @param {module:engine/view/writer~Writer} writer\n\t */\n\tremove( id, writer ) {\n\t\tconst stack = this._stack;\n\n\t\tconst oldTop = stack[ 0 ];\n\t\tthis._removeDescriptor( id );\n\t\tconst newTop = stack[ 0 ];\n\n\t\t// When new object is at the top and stores different information.\n\t\tif ( oldTop !== newTop && !compareDescriptors( oldTop, newTop ) ) {\n\t\t\tthis.fire( 'change:top', {\n\t\t\t\toldDescriptor: oldTop,\n\t\t\t\tnewDescriptor: newTop,\n\t\t\t\twriter\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Inserts given descriptor in correct place in the stack. It also takes care about updating information when\n\t * descriptor with same id is already present.\n\t *\n\t * @private\n\t * @param {module:engine/conversion/downcast-converters~HighlightDescriptor} descriptor\n\t */\n\t_insertDescriptor( descriptor ) {\n\t\tconst stack = this._stack;\n\t\tconst index = stack.findIndex( item => item.id === descriptor.id );\n\n\t\t// Inserting exact same descriptor - do nothing.\n\t\tif ( compareDescriptors( descriptor, stack[ index ] ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If descriptor with same id but with different information is on the stack - remove it.\n\t\tif ( index > -1 ) {\n\t\t\tstack.splice( index, 1 );\n\t\t}\n\n\t\t// Find correct place to insert descriptor in the stack.\n\t\t// It have different information (for example priority) so it must be re-inserted in correct place.\n\t\tlet i = 0;\n\n\t\twhile ( stack[ i ] && shouldABeBeforeB( stack[ i ], descriptor ) ) {\n\t\t\ti++;\n\t\t}\n\n\t\tstack.splice( i, 0, descriptor );\n\t}\n\n\t/**\n\t * Removes descriptor with given id from the stack.\n\t *\n\t * @private\n\t * @param {String} id Descriptor's id.\n\t */\n\t_removeDescriptor( id ) {\n\t\tconst stack = this._stack;\n\t\tconst index = stack.findIndex( item => item.id === id );\n\n\t\t// If descriptor with same id is on the list - remove it.\n\t\tif ( index > -1 ) {\n\t\t\tstack.splice( index, 1 );\n\t\t}\n\t}\n}\n\nmix( HighlightStack, EmitterMixin );\n\n// Compares two descriptors by checking their priority and class list.\n//\n// @param {module:engine/conversion/downcast-converters~HighlightDescriptor} a\n// @param {module:engine/conversion/downcast-converters~HighlightDescriptor} b\n// @returns {Boolean} Returns true if both descriptors are defined and have same priority and classes.\nfunction compareDescriptors( a, b ) {\n\treturn a && b && a.priority == b.priority && classesToString( a.classes ) == classesToString( b.classes );\n}\n\n// Checks whenever first descriptor should be placed in the stack before second one.\n//\n// @param {module:engine/conversion/downcast-converters~HighlightDescriptor} a\n// @param {module:engine/conversion/downcast-converters~HighlightDescriptor} b\n// @returns {Boolean}\nfunction shouldABeBeforeB( a, b ) {\n\tif ( a.priority > b.priority ) {\n\t\treturn true;\n\t} else if ( a.priority < b.priority ) {\n\t\treturn false;\n\t}\n\n\t// When priorities are equal and names are different - use classes to compare.\n\treturn classesToString( a.classes ) > classesToString( b.classes );\n}\n\n// Converts CSS classes passed with {@link module:engine/conversion/downcast-converters~HighlightDescriptor} to\n// sorted string.\n//\n// @param {String|Array<String>} descriptor\n// @returns {String}\nfunction classesToString( classes ) {\n\treturn Array.isArray( classes ) ? classes.sort().join( ',' ) : classes;\n}\n\n/**\n * Fired when top element on {@link module:widget/highlightstack~HighlightStack} has been changed\n *\n * @event change:top\n * @param {Object} data Additional information about the change.\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor} [data.newDescriptor] New highlight\n * descriptor. It will be `undefined` when last descriptor is removed from the stack.\n * @param {module:engine/conversion/downcast-converters~HighlightDescriptor} [data.oldDescriptor] Old highlight\n * descriptor. It will be `undefined` when first descriptor is added to the stack.\n * @param {module:engine/view/writer~Writer} writer View writer that can be used to modify element.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module widget/utils\n */\n\nimport HighlightStack from './highlightstack';\nimport Position from '@ckeditor/ckeditor5-engine/src/view/position';\nimport IconView from '@ckeditor/ckeditor5-ui/src/icon/iconview';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\nimport dragHandlerIcon from '../theme/icons/drag-handler.svg';\n\nconst widgetSymbol = Symbol( 'isWidget' );\nconst labelSymbol = Symbol( 'label' );\n\n/**\n * CSS class added to each widget element.\n *\n * @const {String}\n */\nexport const WIDGET_CLASS_NAME = 'ck-widget';\n\n/**\n * CSS class added to currently selected widget element.\n *\n * @const {String}\n */\nexport const WIDGET_SELECTED_CLASS_NAME = 'ck-widget_selected';\n\n/**\n * Returns `true` if given {@link module:engine/view/element~Element} is a widget.\n *\n * @param {module:engine/view/element~Element} element\n * @returns {Boolean}\n */\nexport function isWidget( element ) {\n\treturn !!element.getCustomProperty( widgetSymbol );\n}\n\n/**\n * Converts given {@link module:engine/view/element~Element} to widget in following way:\n * * sets `contenteditable` attribute to `\"true\"`,\n * * adds custom `getFillerOffset` method returning `null`,\n * * adds `ck-widget` CSS class,\n * * adds custom property allowing to recognize widget elements by using {@link ~isWidget},\n * * implements `addHighlight` and `removeHighlight` custom properties to handle view highlight on widgets.\n *\n * @param {module:engine/view/element~Element} element\n * @param {module:engine/view/writer~Writer} writer\n * @param {Object} [options={}]\n * @param {String|Function} [options.label] Element's label provided to {@link ~setLabel} function. It can be passed as\n * a plain string or a function returning a string.\n * @param {Boolean} [options.hasSelectionHandler=false] If `true`, the widget will have a selection handler added.\n * @returns {module:engine/view/element~Element} Returns same element.\n */\nexport function toWidget( element, writer, options = {} ) {\n\t// The selection on Edge behaves better when the whole editor contents is in a single contentedible element.\n\t// https://github.com/ckeditor/ckeditor5/issues/1079\n\tif ( !env.isEdge ) {\n\t\twriter.setAttribute( 'contenteditable', 'false', element );\n\t}\n\n\twriter.addClass( WIDGET_CLASS_NAME, element );\n\twriter.setCustomProperty( widgetSymbol, true, element );\n\telement.getFillerOffset = getFillerOffset;\n\n\tif ( options.label ) {\n\t\tsetLabel( element, options.label, writer );\n\t}\n\n\tif ( options.hasSelectionHandler ) {\n\t\taddSelectionHandler( element, writer );\n\t}\n\n\tsetHighlightHandling(\n\t\telement,\n\t\twriter,\n\t\t( element, descriptor, writer ) => writer.addClass( normalizeToArray( descriptor.classes ), element ),\n\t\t( element, descriptor, writer ) => writer.removeClass( normalizeToArray( descriptor.classes ), element )\n\t);\n\n\treturn element;\n\n\t// Normalizes CSS class in descriptor that can be provided in form of an array or a string.\n\tfunction normalizeToArray( classes ) {\n\t\treturn Array.isArray( classes ) ? classes : [ classes ];\n\t}\n}\n\n/**\n * Sets highlight handling methods. Uses {@link module:widget/highlightstack~HighlightStack} to\n * properly determine which highlight descriptor should be used at given time.\n *\n * @param {module:engine/view/element~Element} element\n * @param {module:engine/view/writer~Writer} writer\n * @param {Function} add\n * @param {Function} remove\n */\nexport function setHighlightHandling( element, writer, add, remove ) {\n\tconst stack = new HighlightStack();\n\n\tstack.on( 'change:top', ( evt, data ) => {\n\t\tif ( data.oldDescriptor ) {\n\t\t\tremove( element, data.oldDescriptor, data.writer );\n\t\t}\n\n\t\tif ( data.newDescriptor ) {\n\t\t\tadd( element, data.newDescriptor, data.writer );\n\t\t}\n\t} );\n\n\twriter.setCustomProperty( 'addHighlight', ( element, descriptor, writer ) => stack.add( descriptor, writer ), element );\n\twriter.setCustomProperty( 'removeHighlight', ( element, id, writer ) => stack.remove( id, writer ), element );\n}\n\n/**\n * Sets label for given element.\n * It can be passed as a plain string or a function returning a string. Function will be called each time label is retrieved by\n * {@link ~getLabel}.\n *\n * @param {module:engine/view/element~Element} element\n * @param {String|Function} labelOrCreator\n * @param {module:engine/view/writer~Writer} writer\n */\nexport function setLabel( element, labelOrCreator, writer ) {\n\twriter.setCustomProperty( labelSymbol, labelOrCreator, element );\n}\n\n/**\n * Returns label for provided element.\n *\n * @param {module:engine/view/element~Element} element\n * @returns {String}\n */\nexport function getLabel( element ) {\n\tconst labelCreator = element.getCustomProperty( labelSymbol );\n\n\tif ( !labelCreator ) {\n\t\treturn '';\n\t}\n\n\treturn typeof labelCreator == 'function' ? labelCreator() : labelCreator;\n}\n\n/**\n * Adds functionality to provided {module:engine/view/editableelement~EditableElement} to act as a widget's editable:\n * * adds `ck-editor__editable` and `ck-editor__nested-editable` CSS classes,\n * * sets `contenteditable` as `true` when {module:engine/view/editableelement~EditableElement#isReadOnly} is `false`\n * otherwise set `false`,\n * * adds `ck-editor__nested-editable_focused` CSS class when editable is focused and removes it when it's blurred.\n *\n * @param {module:engine/view/editableelement~EditableElement} editable\n * @param {module:engine/view/writer~Writer} writer\n * @returns {module:engine/view/editableelement~EditableElement} Returns same element that was provided in `editable` param.\n */\nexport function toWidgetEditable( editable, writer ) {\n\twriter.addClass( [ 'ck-editor__editable', 'ck-editor__nested-editable' ], editable );\n\n\t// The selection on Edge behaves better when the whole editor contents is in a single contentedible element.\n\t// https://github.com/ckeditor/ckeditor5/issues/1079\n\tif ( !env.isEdge ) {\n\t\t// Set initial contenteditable value.\n\t\twriter.setAttribute( 'contenteditable', editable.isReadOnly ? 'false' : 'true', editable );\n\n\t\t// Bind the contenteditable property to element#isReadOnly.\n\t\teditable.on( 'change:isReadOnly', ( evt, property, is ) => {\n\t\t\twriter.setAttribute( 'contenteditable', is ? 'false' : 'true', editable );\n\t\t} );\n\t}\n\n\teditable.on( 'change:isFocused', ( evt, property, is ) => {\n\t\tif ( is ) {\n\t\t\twriter.addClass( 'ck-editor__nested-editable_focused', editable );\n\t\t} else {\n\t\t\twriter.removeClass( 'ck-editor__nested-editable_focused', editable );\n\t\t}\n\t} );\n\n\treturn editable;\n}\n\n// Default filler offset function applied to all widget elements.\n//\n// @returns {null}\nfunction getFillerOffset() {\n\treturn null;\n}\n\n// Adds a drag handler to the editable element.\n//\n// @param {module:engine/view/editableelement~EditableElement}\n// @param {module:engine/view/writer~Writer} writer\nfunction addSelectionHandler( editable, writer ) {\n\tconst selectionHandler = writer.createUIElement( 'div', { class: 'ck ck-widget__selection-handler' }, function( domDocument ) {\n\t\tconst domElement = this.toDomElement( domDocument );\n\n\t\t// Use the IconView from the ui library.\n\t\tconst icon = new IconView();\n\t\ticon.set( 'content', dragHandlerIcon );\n\n\t\t// Render the icon view right away to append its #element to the selectionHandler DOM element.\n\t\ticon.render();\n\n\t\tdomElement.appendChild( icon.element );\n\n\t\treturn domElement;\n\t} );\n\n\t// Append the selection handler into the widget wrapper.\n\twriter.insert( Position.createAt( editable ), selectionHandler );\n\twriter.addClass( [ 'ck-widget_selectable' ], editable );\n}\n","import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport { toWidget } from '@ckeditor/ckeditor5-widget/src/utils';\nimport {upcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\n\nexport default class OPMacroTocPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPMacroToc';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn 'insertToc';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst conversion = editor.conversion;\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'op-macro-toc', {\n\t\t\tallowWhere: '$block',\n\t\t\tisBlock: true,\n\t\t    isLimit: true\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'macro',\n\t\t\t\t\tclasses: 'toc'\n\t\t\t\t},\n\t\t\t\tmodel: 'op-macro-toc'\n\t\t\t} ) );\n\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastElementToElement({\n\t\t\tmodel: 'op-macro-toc',\n\t\t\tview: (modelElement, viewWriter) => {\n\t\t\t\treturn toWidget(this.createTocViewElement(viewWriter), viewWriter, { label: this.label } )\n\t\t\t}\n\t    } ));\n\n\t\tconversion.for('dataDowncast').add(downcastElementToElement({\n\t\t\tmodel: 'op-macro-toc',\n\t\t\tview: (modelElement, viewWriter) => {\n\t\t\t\treturn this.createTocDataElement(viewWriter)\n\t\t\t}\n\t\t}));\n\n\t\teditor.ui.componentFactory.add( OPMacroTocPlugin.buttonName, locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: this.label,\n\t\t\t\twithText: true,\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\teditor.model.change( writer => {\n\t\t\t\t\tconst tocElement = writer.createElement( 'op-macro-toc', {});\n\n\t\t\t\t\t// Insert the image in the current selection location.\n\t\t\t\t\teditor.model.insertContent( tocElement, editor.model.document.selection );\n\t\t\t\t} );\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tget label() {\n\t\treturn window.I18n.t('js.editor.macro.toc');\n\t}\n\n\tcreateTocViewElement(writer) {\n\t\tconst placeholder = writer.createText( this.label );\n\t\tconst container = writer.createContainerElement( 'div', { class: 'macro -toc' } );\n\n\t\twriter.insert( ViewPosition.createAt( container ), placeholder );\n\t\treturn container;\n\t}\n\n\tcreateTocDataElement(writer) {\n\t\treturn writer.createContainerElement('macro', { class: 'toc' } );\n\t}\n\n}\n","const embeddedTableSymbol = Symbol( 'isOPEmbeddedTable' );\nimport {toWidget, isWidget} from '@ckeditor/ckeditor5-widget/src/utils';\n\nexport function toEmbeddedTableWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( embeddedTableSymbol, true, viewElement );\n\treturn toWidget( viewElement, writer, { label: 'your label here' } );\n}\n\n\nexport function isEmbeddedTableWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( embeddedTableSymbol ) && isWidget( viewElement );\n}\n\n\nexport function isEmbeddedTableWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isEmbeddedTableWidget( viewElement ) );\n}\n","import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {upcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport {toEmbeddedTableWidget} from './utils';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\n\nexport default class EmbeddedTableEditing extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'EmbeddedTableEditing';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn 'insertEmbeddedTable';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst conversion = editor.conversion;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\tthis.text = {\n\t\t\tbutton: window.I18n.t('js.editor.macro.embedded_table.button'),\n\t\t\tmacro_text: window.I18n.t('js.editor.macro.embedded_table.text'),\n\t\t};\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'op-macro-embedded-table', {\n\t\t\tallowWhere: '$block',\n\t\t\tallowAttributes: ['opEmbeddedTableQuery'],\n\t\t\tisBlock: true,\n\t\t\tisObject: true\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'macro',\n\t\t\t\t\tclasses: 'embedded-table',\n\t\t\t\t},\n\t\t\t\tmodel: ( viewElement, modelWriter ) => {\n\t\t\t\t\tconst queryProps = viewElement.getAttribute( 'data-query-props' );\n\t\t\t\t\treturn modelWriter.createElement(\n\t\t\t\t\t\t'op-macro-embedded-table',\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\topEmbeddedTableQuery: queryProps ? JSON.parse(queryProps) : {}\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} ) );\n\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastElementToElement({\n\t\t\tmodel: 'op-macro-embedded-table',\n\t\t\tview: (modelElement, viewWriter) => {\n\t\t\t\treturn toEmbeddedTableWidget(this.createEmbeddedTableView(viewWriter), viewWriter, { label: this.label } )\n\t\t\t}\n\t    } ));\n\n\t\tconversion.for('dataDowncast').add(downcastElementToElement({\n\t\t\tmodel: 'op-macro-embedded-table',\n\t\t\tview: (modelElement, viewWriter) => {\n\t\t\t\treturn this.createEmbeddedTableDataElement(modelElement, viewWriter)\n\t\t\t}\n\t\t}));\n\n\t\teditor.ui.componentFactory.add( EmbeddedTableEditing.buttonName, locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: this.text.button,\n\t\t\t\twithText: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the widget is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\tconst externalQueryConfiguration = pluginContext.services.externalQueryConfiguration;\n\t\t\t\tconst currentQuery = {}; // Initial query currently empty, we may want to provide context here.\n\n\t\t\t\texternalQueryConfiguration.show(\n\t\t\t\t\tcurrentQuery,\n\t\t\t\t\t(newQuery) => editor.model.change(writer => {\n\t\t\t\t\t\tconst element = writer.createElement( 'op-macro-embedded-table', { opEmbeddedTableQuery: newQuery });\n\n\t\t\t\t\t\t// Insert the widget in the current selection location.\n\t\t\t\t\t\teditor.model.insertContent( element, editor.model.document.selection );\n\t\t\t\t\t})\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tcreateEmbeddedTableView(writer) {\n\t\tconst placeholder = writer.createText( this.text.macro_text );\n\t\tconst container = writer.createContainerElement( 'div', { class: 'macro -embedded-table' } );\n\n\t\twriter.insert( ViewPosition.createAt( container ), placeholder );\n\t\treturn container;\n\n\t\t// The following doesnt work when removing the widget...\n\t\t// let that = this;\n\t\t// return writer.createUIElement( 'div', { class: 'macro -embedded-table' }, function(containerDocument) {\n\t\t// \tconst containerElement = this.toDomElement(containerDocument);\n\t\t// \tcontainerElement.innerHTML = imageIcon + '<div class=\"macro--description\">' + that.text.macro_text + '</div>';\n\n\t\t// \treturn containerElement;\n\t\t// } );\n\t}\n\n\tcreateEmbeddedTableDataElement(modelElement, writer) {\n\t\tconst queryProps = modelElement.getAttribute('opEmbeddedTableQuery') || {};\n\t\tconst element = writer.createContainerElement(\n\t\t\t'macro',\n\t\t\t{\n\t\t\t\t'class': 'embedded-table',\n\t\t\t\t'data-query-props': JSON.stringify(queryProps)\n\t\t\t}\n\t\t);\n\n\t\treturn element;\n\t}\n\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/mouseobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * Mouse events observer.\n *\n * Note that this observer is not available by default. To make it available it needs to be added to\n * {@link module:engine/view/view~View} by {@link module:engine/view/view~View#addObserver} method.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class MouseObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = 'mousedown';\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when mouse button is pressed down on one of the editables.\n *\n * Introduced by {@link module:engine/view/observer/mouseobserver~MouseObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:engine/view/observer/mouseobserver~MouseObserver}\n * needs to be added to {@link module:engine/view/view~View} by a {@link module:engine/view/view~View#addObserver} method.\n *\n * @see module:engine/view/observer/mouseobserver~MouseObserver\n * @event module:engine/view/document~Document#event:mousedown\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module widget/widget\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport MouseObserver from '@ckeditor/ckeditor5-engine/src/view/observer/mouseobserver';\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ModelSelection from '@ckeditor/ckeditor5-engine/src/model/selection';\nimport ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';\nimport ViewEditableElement from '@ckeditor/ckeditor5-engine/src/view/editableelement';\nimport RootEditableElement from '@ckeditor/ckeditor5-engine/src/view/rooteditableelement';\nimport { isWidget, WIDGET_SELECTED_CLASS_NAME, getLabel } from './utils';\nimport { keyCodes, getCode, parseKeystroke } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\nimport '../theme/widget.css';\n\nconst selectAllKeystrokeCode = parseKeystroke( 'Ctrl+A' );\n\n/**\n * The widget plugin.\n * Registers model to view selection converter for editing pipeline. It is hooked after default selection conversion.\n * If converted selection is placed around widget element, selection is marked as fake. Additionally, proper CSS class\n * is added to indicate that widget has been selected.\n * Adds default {@link module:engine/view/document~Document#event:mousedown mousedown} handling on widget elements.\n *\n * @extends module:core/plugin~Plugin.\n */\nexport default class Widget extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Widget';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst view = this.editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t/**\n\t\t * Holds previously selected widgets.\n\t\t *\n\t\t * @private\n\t\t * @type {Set.<module:engine/view/element~Element>}\n\t\t */\n\t\tthis._previouslySelected = new Set();\n\n\t\t// Model to view selection converter.\n\t\t// Converts selection placed over widget element to fake selection\n\t\tthis.editor.editing.downcastDispatcher.on( 'selection', ( evt, data, conversionApi ) => {\n\t\t\t// Remove selected class from previously selected widgets.\n\t\t\tthis._clearPreviouslySelectedWidgets( conversionApi.writer );\n\n\t\t\tconst viewWriter = conversionApi.writer;\n\t\t\tconst viewSelection = viewWriter.document.selection;\n\t\t\tconst selectedElement = viewSelection.getSelectedElement();\n\n\t\t\tfor ( const range of viewSelection.getRanges() ) {\n\t\t\t\tfor ( const value of range ) {\n\t\t\t\t\tconst node = value.item;\n\n\t\t\t\t\tif ( node.is( 'element' ) && isWidget( node ) ) {\n\t\t\t\t\t\tviewWriter.addClass( WIDGET_SELECTED_CLASS_NAME, node );\n\t\t\t\t\t\tthis._previouslySelected.add( node );\n\n\t\t\t\t\t\t// Check if widget is a single element selected.\n\t\t\t\t\t\tif ( node == selectedElement ) {\n\t\t\t\t\t\t\tviewWriter.setSelection( viewSelection.getRanges(), { fake: true, label: getLabel( selectedElement ) } );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// If mouse down is pressed on widget - create selection over whole widget.\n\t\tview.addObserver( MouseObserver );\n\t\tthis.listenTo( viewDocument, 'mousedown', ( ...args ) => this._onMousedown( ...args ) );\n\n\t\t// Handle custom keydown behaviour.\n\t\tthis.listenTo( viewDocument, 'keydown', ( ...args ) => this._onKeydown( ...args ), { priority: 'high' } );\n\n\t\t// Handle custom delete behaviour.\n\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\tif ( this._handleDelete( data.direction == 'forward' ) ) {\n\t\t\t\tdata.preventDefault();\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:mousedown mousedown} events on widget elements.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_onMousedown( eventInfo, domEventData ) {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\t\tlet element = domEventData.target;\n\n\t\t// Do nothing if inside nested editable.\n\t\tif ( isInsideNestedEditable( element ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If target is not a widget element - check if one of the ancestors is.\n\t\tif ( !isWidget( element ) ) {\n\t\t\telement = element.findAncestor( isWidget );\n\n\t\t\tif ( !element ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\tdomEventData.preventDefault();\n\n\t\t// Focus editor if is not focused already.\n\t\tif ( !viewDocument.isFocused ) {\n\t\t\tview.focus();\n\t\t}\n\n\t\t// Create model selection over widget.\n\t\tconst modelElement = editor.editing.mapper.toModelElement( element );\n\n\t\tthis._setSelectionOverElement( modelElement );\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_onKeydown( eventInfo, domEventData ) {\n\t\tconst keyCode = domEventData.keyCode;\n\t\tconst isForward = keyCode == keyCodes.delete || keyCode == keyCodes.arrowdown || keyCode == keyCodes.arrowright;\n\t\tlet wasHandled = false;\n\n\t\t// Checks if the keys were handled and then prevents the default event behaviour and stops\n\t\t// the propagation.\n\t\tif ( isArrowKeyCode( keyCode ) ) {\n\t\t\twasHandled = this._handleArrowKeys( isForward );\n\t\t} else if ( isSelectAllKeyCode( domEventData ) ) {\n\t\t\twasHandled = this._selectAllNestedEditableContent() || this._selectAllContent();\n\t\t} else if ( keyCode === keyCodes.enter ) {\n\t\t\twasHandled = this._handleEnterKey( domEventData.shiftKey );\n\t\t}\n\n\t\tif ( wasHandled ) {\n\t\t\tdomEventData.preventDefault();\n\t\t\teventInfo.stop();\n\t\t}\n\t}\n\n\t/**\n\t * Handles delete keys: backspace and delete.\n\t *\n\t * @private\n\t * @param {Boolean} isForward Set to true if delete was performed in forward direction.\n\t * @returns {Boolean|undefined} Returns `true` if keys were handled correctly.\n\t */\n\t_handleDelete( isForward ) {\n\t\t// Do nothing when the read only mode is enabled.\n\t\tif ( this.editor.isReadOnly ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst modelDocument = this.editor.model.document;\n\t\tconst modelSelection = modelDocument.selection;\n\n\t\t// Do nothing on non-collapsed selection.\n\t\tif ( !modelSelection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst objectElement = this._getObjectElementNextToSelection( isForward );\n\n\t\tif ( objectElement ) {\n\t\t\tthis.editor.model.change( writer => {\n\t\t\t\tlet previousNode = modelSelection.anchor.parent;\n\n\t\t\t\t// Remove previous element if empty.\n\t\t\t\twhile ( previousNode.isEmpty ) {\n\t\t\t\t\tconst nodeToRemove = previousNode;\n\t\t\t\t\tpreviousNode = nodeToRemove.parent;\n\n\t\t\t\t\twriter.remove( nodeToRemove );\n\t\t\t\t}\n\n\t\t\t\tthis._setSelectionOverElement( objectElement );\n\t\t\t} );\n\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Handles arrow keys.\n\t *\n\t * @private\n\t * @param {Boolean} isForward Set to true if arrow key should be handled in forward direction.\n\t * @returns {Boolean|undefined} Returns `true` if keys were handled correctly.\n\t */\n\t_handleArrowKeys( isForward ) {\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst modelDocument = model.document;\n\t\tconst modelSelection = modelDocument.selection;\n\t\tconst objectElement = modelSelection.getSelectedElement();\n\n\t\t// If object element is selected.\n\t\tif ( objectElement && schema.isObject( objectElement ) ) {\n\t\t\tconst position = isForward ? modelSelection.getLastPosition() : modelSelection.getFirstPosition();\n\t\t\tconst newRange = schema.getNearestSelectionRange( position, isForward ? 'forward' : 'backward' );\n\n\t\t\tif ( newRange ) {\n\t\t\t\tmodel.change( writer => {\n\t\t\t\t\twriter.setSelection( newRange );\n\t\t\t\t} );\n\t\t\t}\n\n\t\t\treturn true;\n\t\t}\n\n\t\t// If selection is next to object element.\n\t\t// Return if not collapsed.\n\t\tif ( !modelSelection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst objectElement2 = this._getObjectElementNextToSelection( isForward );\n\n\t\tif ( objectElement2 instanceof ModelElement && schema.isObject( objectElement2 ) ) {\n\t\t\tthis._setSelectionOverElement( objectElement2 );\n\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Handles the enter key, giving users and access to positions in the editable directly before\n\t * (<kbd>Shift</kbd>+<kbd>Enter</kbd>) or after (<kbd>Enter</kbd>) the selected widget.\n\t * It improves the UX, mainly when the widget is the first or last child of the root editable\n\t * and there's no other way to type after or before it.\n\t *\n\t * @private\n\t * @param {Boolean} isBackwards Set to true if the new paragraph is to be inserted before\n\t * the selected widget (<kbd>Shift</kbd>+<kbd>Enter</kbd>).\n\t * @returns {Boolean|undefined} Returns `true` if keys were handled correctly.\n\t */\n\t_handleEnterKey( isBackwards ) {\n\t\tconst model = this.editor.model;\n\t\tconst modelSelection = model.document.selection;\n\t\tconst objectElement = modelSelection.getSelectedElement();\n\n\t\tif ( objectElement && model.schema.isObject( objectElement ) ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\tconst paragraph = writer.createElement( 'paragraph' );\n\n\t\t\t\twriter.insert( paragraph, objectElement, isBackwards ? 'before' : 'after' );\n\t\t\t\twriter.setSelection( paragraph, 'in' );\n\t\t\t} );\n\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Extends the {@link module:engine/model/selection~Selection document's selection} to span the entire\n\t * content of the nested editable if already anchored in one.\n\t *\n\t * See: {@link module:engine/model/schema~Schema#getLimitElement}.\n\t *\n\t * @private\n\t */\n\t_selectAllNestedEditableContent() {\n\t\tconst model = this.editor.model;\n\t\tconst documentSelection = model.document.selection;\n\t\tconst limitElement = model.schema.getLimitElement( documentSelection );\n\n\t\tif ( documentSelection.getFirstRange().root == limitElement ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tmodel.change( writer => {\n\t\t\twriter.setSelection( ModelRange.createIn( limitElement ) );\n\t\t} );\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Handles <kbd>CTRL + A</kbd> when widget is selected.\n\t *\n\t * @private\n\t * @returns {Boolean} Returns true if widget was selected and selecting all was handled by this method.\n\t */\n\t_selectAllContent() {\n\t\tconst model = this.editor.model;\n\t\tconst editing = this.editor.editing;\n\t\tconst view = editing.view;\n\t\tconst viewDocument = view.document;\n\t\tconst viewSelection = viewDocument.selection;\n\n\t\tconst selectedElement = viewSelection.getSelectedElement();\n\n\t\t// Only widget is selected.\n\t\t// https://github.com/ckeditor/ckeditor5-widget/issues/23\n\t\tif ( selectedElement && isWidget( selectedElement ) ) {\n\t\t\tconst widgetParent = editing.mapper.toModelElement( selectedElement.parent );\n\n\t\t\tmodel.change( writer => {\n\t\t\t\twriter.setSelection( ModelRange.createIn( widgetParent ) );\n\t\t\t} );\n\n\t\t\treturn true;\n\t\t}\n\n\t\treturn false;\n\t}\n\n\t/**\n\t * Sets {@link module:engine/model/selection~Selection document's selection} over given element.\n\t *\n\t * @private\n\t * @param {module:engine/model/element~Element} element\n\t */\n\t_setSelectionOverElement( element ) {\n\t\tthis.editor.model.change( writer => {\n\t\t\twriter.setSelection( ModelRange.createOn( element ) );\n\t\t} );\n\t}\n\n\t/**\n\t * Checks if {@link module:engine/model/element~Element element} placed next to the current\n\t * {@link module:engine/model/selection~Selection model selection} exists and is marked in\n\t * {@link module:engine/model/schema~Schema schema} as `object`.\n\t *\n\t * @private\n\t * @param {Boolean} forward Direction of checking.\n\t * @returns {module:engine/model/element~Element|null}\n\t */\n\t_getObjectElementNextToSelection( forward ) {\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst modelSelection = model.document.selection;\n\n\t\t// Clone current selection to use it as a probe. We must leave default selection as it is so it can return\n\t\t// to its current state after undo.\n\t\tconst probe = new ModelSelection( modelSelection );\n\t\tmodel.modifySelection( probe, { direction: forward ? 'forward' : 'backward' } );\n\t\tconst objectElement = forward ? probe.focus.nodeBefore : probe.focus.nodeAfter;\n\n\t\tif ( objectElement instanceof ModelElement && schema.isObject( objectElement ) ) {\n\t\t\treturn objectElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Removes CSS class from previously selected widgets.\n\t *\n\t * @private\n\t * @param {module:engine/view/writer~Writer} writer\n\t */\n\t_clearPreviouslySelectedWidgets( writer ) {\n\t\tfor ( const widget of this._previouslySelected ) {\n\t\t\twriter.removeClass( WIDGET_SELECTED_CLASS_NAME, widget );\n\t\t}\n\n\t\tthis._previouslySelected.clear();\n\t}\n}\n\n// Returns 'true' if provided key code represents one of the arrow keys.\n//\n// @param {Number} keyCode\n// @returns {Boolean}\nfunction isArrowKeyCode( keyCode ) {\n\treturn keyCode == keyCodes.arrowright ||\n\t\tkeyCode == keyCodes.arrowleft ||\n\t\tkeyCode == keyCodes.arrowup ||\n\t\tkeyCode == keyCodes.arrowdown;\n}\n\n// Returns 'true' if provided (DOM) key event data corresponds with the Ctrl+A keystroke.\n//\n// @param {module:engine/view/observer/keyobserver~KeyEventData} domEventData\n// @returns {Boolean}\nfunction isSelectAllKeyCode( domEventData ) {\n\treturn getCode( domEventData ) == selectAllKeystrokeCode;\n}\n\n// Returns `true` when element is a nested editable or is placed inside one.\n//\n// @param {module:engine/view/element~Element}\n// @returns {Boolean}\nfunction isInsideNestedEditable( element ) {\n\twhile ( element ) {\n\t\tif ( element instanceof ViewEditableElement && !( element instanceof RootEditableElement ) ) {\n\t\t\treturn true;\n\t\t}\n\n\t\telement = element.parent;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/position\n */\n\nimport global from './global';\nimport Rect from './rect';\nimport getPositionedAncestor from './getpositionedancestor';\nimport getBorderWidths from './getborderwidths';\nimport isFunction from '../lib/lodash/isFunction';\n\n/**\n * Calculates the `position: absolute` coordinates of a given element so it can be positioned with respect to the\n * target in the visually most efficient way, taking various restrictions like viewport or limiter geometry\n * into consideration.\n *\n *\t\t// The element which is to be positioned.\n *\t\tconst element = document.body.querySelector( '#toolbar' );\n *\n *\t\t// A target to which the element is positioned relatively.\n *\t\tconst target = document.body.querySelector( '#container' );\n *\n *\t\t// Finding the optimal coordinates for the positioning.\n *\t\tconst { left, top, name } = getOptimalPosition( {\n *\t\t\telement: element,\n *\t\t\ttarget: target,\n *\n * \t\t\t// The algorithm will chose among these positions to meet the requirements such\n * \t\t\t// as \"limiter\" element or \"fitInViewport\", set below. The positions are considered\n * \t\t\t// in the order of the array.\n *\t\t\tpositions: [\n *\t\t\t\t//\n *\t\t\t \t//\t[ Target ]\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t|     Element     |\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\n *\t\t\t\ttargetRect => ( {\n *\t\t\t\t\ttop: targetRect.bottom,\n *\t\t\t\t\tleft: targetRect.left,\n *\t\t\t\t\tname: 'mySouthEastPosition'\n *\t\t\t\t} ),\n *\n *\t\t\t\t//\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t|     Element     |\n *\t\t\t\t//\t+-----------------+\n *\t\t\t\t//\t[ Target ]\n *\t\t\t\t//\n *\t\t\t\t( targetRect, elementRect ) => ( {\n *\t\t\t\t\ttop: targetRect.top - elementRect.height,\n *\t\t\t\t\tleft: targetRect.left,\n *\t\t\t\t\tname: 'myNorthEastPosition'\n *\t\t\t\t} )\n *\t\t\t],\n *\n *\t\t\t// Find a position such guarantees the element remains within visible boundaries of <body>.\n *\t\t\tlimiter: document.body,\n *\n *\t\t\t// Find a position such guarantees the element remains within visible boundaries of the browser viewport.\n *\t\t\tfitInViewport: true\n *\t\t} );\n *\n *\t\t// The best position which fits into document.body and the viewport. May be useful\n *\t\t// to set proper class on the `element`.\n *\t\tconsole.log( name ); -> \"myNorthEastPosition\"\n *\n *\t\t// Using the absolute coordinates which has been found to position the element\n *\t\t// as in the diagram depicting the \"myNorthEastPosition\" position.\n *\t\telement.style.top = top;\n *\t\telement.style.left = left;\n *\n * @param {module:utils/dom/position~Options} options Positioning options object.\n * @returns {module:utils/dom/position~Position}\n */\nexport function getOptimalPosition( { element, target, positions, limiter, fitInViewport } ) {\n\t// If the {@link module:utils/dom/position~Options#target} is a function, use what it returns.\n\t// https://github.com/ckeditor/ckeditor5-utils/issues/157\n\tif ( isFunction( target ) ) {\n\t\ttarget = target();\n\t}\n\n\t// If the {@link module:utils/dom/position~Options#limiter} is a function, use what it returns.\n\t// https://github.com/ckeditor/ckeditor5-ui/issues/260\n\tif ( isFunction( limiter ) ) {\n\t\tlimiter = limiter();\n\t}\n\n\tconst positionedElementAncestor = getPositionedAncestor( element.parentElement );\n\tconst elementRect = new Rect( element );\n\tconst targetRect = new Rect( target );\n\n\tlet bestPosition;\n\tlet name;\n\n\t// If there are no limits, just grab the very first position and be done with that drama.\n\tif ( !limiter && !fitInViewport ) {\n\t\t[ name, bestPosition ] = getPosition( positions[ 0 ], targetRect, elementRect );\n\t} else {\n\t\tconst limiterRect = limiter && new Rect( limiter ).getVisible();\n\t\tconst viewportRect = fitInViewport && new Rect( global.window );\n\n\t\t[ name, bestPosition ] =\n\t\t\tgetBestPosition( positions, targetRect, elementRect, limiterRect, viewportRect ) ||\n\t\t\t// If there's no best position found, i.e. when all intersections have no area because\n\t\t\t// rects have no width or height, then just use the first available position.\n\t\t\tgetPosition( positions[ 0 ], targetRect, elementRect );\n\t}\n\n\tlet { left, top } = getAbsoluteRectCoordinates( bestPosition );\n\n\tif ( positionedElementAncestor ) {\n\t\tconst ancestorPosition = getAbsoluteRectCoordinates( new Rect( positionedElementAncestor ) );\n\t\tconst ancestorBorderWidths = getBorderWidths( positionedElementAncestor );\n\n\t\t// (https://github.com/ckeditor/ckeditor5-ui-default/issues/126)\n\t\t// If there's some positioned ancestor of the panel, then its `Rect` must be taken into\n\t\t// consideration. `Rect` is always relative to the viewport while `position: absolute` works\n\t\t// with respect to that positioned ancestor.\n\t\tleft -= ancestorPosition.left;\n\t\ttop -= ancestorPosition.top;\n\n\t\t// (https://github.com/ckeditor/ckeditor5-utils/issues/139)\n\t\t// If there's some positioned ancestor of the panel, not only its position must be taken into\n\t\t// consideration (see above) but also its internal scrolls. Scroll have an impact here because `Rect`\n\t\t// is relative to the viewport (it doesn't care about scrolling), while `position: absolute`\n\t\t// must compensate that scrolling.\n\t\tleft += positionedElementAncestor.scrollLeft;\n\t\ttop += positionedElementAncestor.scrollTop;\n\n\t\t// (https://github.com/ckeditor/ckeditor5-utils/issues/139)\n\t\t// If there's some positioned ancestor of the panel, then its `Rect` includes its CSS `borderWidth`\n\t\t// while `position: absolute` positioning does not consider it.\n\t\t// E.g. `{ position: absolute, top: 0, left: 0 }` means upper left corner of the element,\n\t\t// not upper-left corner of its border.\n\t\tleft -= ancestorBorderWidths.left;\n\t\ttop -= ancestorBorderWidths.top;\n\t}\n\n\treturn { left, top, name };\n}\n\n// For given position function, returns a corresponding `Rect` instance.\n//\n// @private\n// @param {Function} position A function returning {@link module:utils/dom/position~Position}.\n// @param {utils/dom/rect~Rect} targetRect A rect of the target.\n// @param {utils/dom/rect~Rect} elementRect A rect of positioned element.\n// @returns {Array} An array containing position name and its Rect.\nfunction getPosition( position, targetRect, elementRect ) {\n\tconst { left, top, name } = position( targetRect, elementRect );\n\n\treturn [ name, elementRect.clone().moveTo( left, top ) ];\n}\n\n// For a given array of positioning functions, returns such that provides the best\n// fit of the `elementRect` into the `limiterRect` and `viewportRect`.\n//\n// @private\n// @param {module:utils/dom/position~Options#positions} positions Functions returning\n// {@link module:utils/dom/position~Position} to be checked, in the order of preference.\n// @param {utils/dom/rect~Rect} targetRect A rect of the {@link module:utils/dom/position~Options#target}.\n// @param {utils/dom/rect~Rect} elementRect A rect of positioned {@link module:utils/dom/position~Options#element}.\n// @param {utils/dom/rect~Rect} limiterRect A rect of the {@link module:utils/dom/position~Options#limiter}.\n// @param {utils/dom/rect~Rect} viewportRect A rect of the viewport.\n// @returns {Array} An array containing the name of the position and it's rect.\nfunction getBestPosition( positions, targetRect, elementRect, limiterRect, viewportRect ) {\n\tlet maxLimiterIntersectArea = 0;\n\tlet maxViewportIntersectArea = 0;\n\tlet bestPositionRect;\n\tlet bestPositionName;\n\n\t// This is when element is fully visible.\n\tconst elementRectArea = elementRect.getArea();\n\n\tpositions.some( position => {\n\t\tconst [ positionName, positionRect ] = getPosition( position, targetRect, elementRect );\n\t\tlet limiterIntersectArea;\n\t\tlet viewportIntersectArea;\n\n\t\tif ( limiterRect ) {\n\t\t\tif ( viewportRect ) {\n\t\t\t\t// Consider only the part of the limiter which is visible in the viewport. So the limiter is getting limited.\n\t\t\t\tconst limiterViewportIntersectRect = limiterRect.getIntersection( viewportRect );\n\n\t\t\t\tif ( limiterViewportIntersectRect ) {\n\t\t\t\t\t// If the limiter is within the viewport, then check the intersection between that part of the\n\t\t\t\t\t// limiter and actual position.\n\t\t\t\t\tlimiterIntersectArea = limiterViewportIntersectRect.getIntersectionArea( positionRect );\n\t\t\t\t} else {\n\t\t\t\t\tlimiterIntersectArea = 0;\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tlimiterIntersectArea = limiterRect.getIntersectionArea( positionRect );\n\t\t\t}\n\t\t}\n\n\t\tif ( viewportRect ) {\n\t\t\tviewportIntersectArea = viewportRect.getIntersectionArea( positionRect );\n\t\t}\n\n\t\t// The only criterion: intersection with the viewport.\n\t\tif ( viewportRect && !limiterRect ) {\n\t\t\tif ( viewportIntersectArea > maxViewportIntersectArea ) {\n\t\t\t\tsetBestPosition();\n\t\t\t}\n\t\t}\n\t\t// The only criterion: intersection with the limiter.\n\t\telse if ( !viewportRect && limiterRect ) {\n\t\t\tif ( limiterIntersectArea > maxLimiterIntersectArea ) {\n\t\t\t\tsetBestPosition();\n\t\t\t}\n\t\t}\n\t\t// Two criteria: intersection with the viewport and the limiter visible in the viewport.\n\t\telse {\n\t\t\tif ( viewportIntersectArea > maxViewportIntersectArea && limiterIntersectArea >= maxLimiterIntersectArea ) {\n\t\t\t\tsetBestPosition();\n\t\t\t} else if ( viewportIntersectArea >= maxViewportIntersectArea && limiterIntersectArea > maxLimiterIntersectArea ) {\n\t\t\t\tsetBestPosition();\n\t\t\t}\n\t\t}\n\n\t\tfunction setBestPosition() {\n\t\t\tmaxViewportIntersectArea = viewportIntersectArea;\n\t\t\tmaxLimiterIntersectArea = limiterIntersectArea;\n\t\t\tbestPositionRect = positionRect;\n\t\t\tbestPositionName = positionName;\n\t\t}\n\n\t\t// If a such position is found that element is fully container by the limiter then, obviously,\n\t\t// there will be no better one, so finishing.\n\t\treturn limiterIntersectArea === elementRectArea;\n\t} );\n\n\treturn bestPositionRect ? [ bestPositionName, bestPositionRect ] : null;\n}\n\n// DOMRect (also Rect) works in a scroll–independent geometry but `position: absolute` doesn't.\n// This function converts Rect to `position: absolute` coordinates.\n//\n// @private\n// @param {utils/dom/rect~Rect} rect A rect to be converted.\n// @returns {Object} Object containing `left` and `top` properties, in absolute coordinates.\nfunction getAbsoluteRectCoordinates( { left, top } ) {\n\tconst { scrollX, scrollY } = global.window;\n\n\treturn {\n\t\tleft: left + scrollX,\n\t\ttop: top + scrollY,\n\t};\n}\n\n/**\n * The `getOptimalPosition` helper options.\n *\n * @interface module:utils/dom/position~Options\n */\n\n/**\n * Element that is to be positioned.\n *\n * @member {HTMLElement} #element\n */\n\n/**\n * Target with respect to which the `element` is to be positioned.\n *\n * @member {HTMLElement|Range|ClientRect|Rect|Function} #target\n */\n\n/**\n * An array of functions which return {@link module:utils/dom/position~Position} relative\n * to the `target`, in the order of preference.\n *\n * @member {Array.<Function>} #positions\n */\n\n/**\n * When set, the algorithm will chose position which fits the most in the\n * limiter's bounding rect.\n *\n * @member {HTMLElement|Range|ClientRect|Rect|Function} #limiter\n */\n\n/**\n * When set, the algorithm will chose such a position which fits `element`\n * the most inside visible viewport.\n *\n * @member {Boolean} #fitInViewport\n */\n\n/**\n * An object describing a position in `position: absolute` coordinate\n * system, along with position name.\n *\n * @typedef {Object} module:utils/dom/position~Position\n *\n * @property {Number} top Top position offset.\n * @property {Number} left Left position offset.\n * @property {String} name Name of the position.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/panel/balloon/balloonpanelview\n */\n\nimport View from '../../view';\nimport { getOptimalPosition } from '@ckeditor/ckeditor5-utils/src/dom/position';\nimport isRange from '@ckeditor/ckeditor5-utils/src/dom/isrange';\nimport isElement from '@ckeditor/ckeditor5-utils/src/lib/lodash/isElement';\nimport toUnit from '@ckeditor/ckeditor5-utils/src/dom/tounit';\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\n\nimport '../../../theme/components/panel/balloonpanel.css';\n\nconst toPx = toUnit( 'px' );\nconst defaultLimiterElement = global.document.body;\n\n/**\n * The balloon panel view class.\n *\n * A floating container which can\n * {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView#pin pin} to any\n * {@link module:utils/dom/position~Options#target target} in DOM and remain in that position\n * e.g. when the web page is scrolled.\n *\n * The balloon panel can be used to display contextual, non-blocking UI like forms, toolbars and\n * the like in its {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView#content} view\n * collection.\n *\n * There is a number of {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView.defaultPositions}\n * that the balloon can use, automatically switching from one to another when the viewport space becomes\n * scarce to keep the balloon visible to the user as long as it is possible. The balloon will also\n * accept any custom position set provided by the user compatible with the\n * {@link module:utils/dom/position~Options options}.\n *\n *\t\tconst panel = new BalloonPanelView( locale );\n *\t\tconst childView = new ChildView();\n *\t\tconst positions = BalloonPanelView.defaultPositions;\n *\n *\t\tpanel.render();\n *\n *\t\t// Add a child view to the panel's content collection.\n *\t\tpanel.content.add( childView );\n *\n *\t\t// Start pinning the panel to an element with the \"target\" id DOM.\n *\t\t// The balloon will remain pinned until unpin() is called.\n *\t\tpanel.pin( {\n *\t\t\ttarget: document.querySelector( '#target' ),\n *\t\t\tpositions: [\n *\t\t\t\tpositions.northArrowSouth,\n *\t\t\t\tpositions.southArrowNorth\n *\t\t\t]\n *\t\t} );\n *\n * @extends module:ui/view~View\n */\nexport default class BalloonPanelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * The absolute top position of the balloon panel in pixels.\n\t\t *\n\t\t * @observable\n\t\t * @default 0\n\t\t * @member {Number} #top\n\t\t */\n\t\tthis.set( 'top', 0 );\n\n\t\t/**\n\t\t * The absolute left position of the balloon panel in pixels.\n\t\t *\n\t\t * @observable\n\t\t * @default 0\n\t\t * @member {Number} #left\n\t\t */\n\t\tthis.set( 'left', 0 );\n\n\t\t/**\n\t\t * Balloon panel's current position. The position name is reflected in the CSS class set\n\t\t * to the balloon, i.e. `.ck-balloon-panel_arrow_nw` for \"arrow_nw\" position. The class\n\t\t * controls the minor aspects of the balloon's visual appearance like placement\n\t\t * of an {@link #withArrow arrow}. To support a new position, an additional CSS must be created.\n\t\t *\n\t\t * Default position names correspond with\n\t\t * {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView.defaultPositions}.\n\t\t *\n\t\t * See the {@link #attachTo} and {@link #pin} methods to learn about custom balloon positions.\n\t\t *\n\t\t * @observable\n\t\t * @default 'arrow_nw'\n\t\t * @member {'arrow_nw'|'arrow_ne'|'arrow_sw'|'arrow_se'} #position\n\t\t */\n\t\tthis.set( 'position', 'arrow_nw' );\n\n\t\t/**\n\t\t * Controls whether the balloon panel is visible or not.\n\t\t *\n\t\t * @observable\n\t\t * @default false\n\t\t * @member {Boolean} #isVisible\n\t\t */\n\t\tthis.set( 'isVisible', false );\n\n\t\t/**\n\t\t * Controls whether the balloon panel has an arrow. The presence of the arrow\n\t\t * is reflected in `ck-balloon-panel_with-arrow` CSS class.\n\t\t *\n\t\t * @observable\n\t\t * @default true\n\t\t * @member {Boolean} #withArrow\n\t\t */\n\t\tthis.set( 'withArrow', true );\n\n\t\t/**\n\t\t * An additional CSS class added to the {@link #element}.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #className\n\t\t */\n\t\tthis.set( 'className' );\n\n\t\t/**\n\t\t * A callback that starts pining the panel when {@link #isVisible} gets\n\t\t * `true`. Used by {@link #pin}.\n\t\t *\n\t\t * @private\n\t\t * @member {Function} #_pinWhenIsVisibleCallback\n\t\t */\n\n\t\t/**\n\t\t * Collection of the child views which creates balloon panel contents.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.content = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-balloon-panel',\n\t\t\t\t\tbind.to( 'position', value => `ck-balloon-panel_${ value }` ),\n\t\t\t\t\tbind.if( 'isVisible', 'ck-balloon-panel_visible' ),\n\t\t\t\t\tbind.if( 'withArrow', 'ck-balloon-panel_with-arrow' ),\n\t\t\t\t\tbind.to( 'className' )\n\t\t\t\t],\n\n\t\t\t\tstyle: {\n\t\t\t\t\ttop: bind.to( 'top', toPx ),\n\t\t\t\t\tleft: bind.to( 'left', toPx )\n\t\t\t\t}\n\t\t\t},\n\n\t\t\tchildren: this.content\n\t\t} );\n\t}\n\n\t/**\n\t * Shows the panel.\n\t *\n\t * See {@link #isVisible}.\n\t */\n\tshow() {\n\t\tthis.isVisible = true;\n\t}\n\n\t/**\n\t * Hides the panel.\n\t *\n\t * See {@link #isVisible}.\n\t */\n\thide() {\n\t\tthis.isVisible = false;\n\t}\n\n\t/**\n\t * Attaches the panel to a specified {@link module:utils/dom/position~Options#target} with a\n\t * smart positioning heuristics that choses from available positions to make sure the panel\n\t * is visible to the user i.e. within the limits of the viewport.\n\t *\n\t * This method accepts configuration {@link module:utils/dom/position~Options options}\n\t * to set the `target`, optional `limiter` and `positions` the balloon should chose from.\n\t *\n\t *\t\tconst panel = new BalloonPanelView( locale );\n\t *\t\tconst positions = BalloonPanelView.defaultPositions;\n\t *\n\t *\t\tpanel.render();\n\t *\n\t *\t\t// Attach the panel to an element with the \"target\" id DOM.\n\t *\t\tpanel.attachTo( {\n\t *\t\t\ttarget: document.querySelector( '#target' ),\n\t *\t\t\tpositions: [\n\t *\t\t\t\tpositions.northArrowSouth,\n\t *\t\t\t\tpositions.southArrowNorth\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t * **Note**: Attaching the panel will also automatically {@link #show} it.\n\t *\n\t * **Note**: An attached panel will not follow its target when the window is scrolled or resized.\n\t * See the {@link #pin} method for more permanent positioning strategy.\n\t *\n\t * @param {module:utils/dom/position~Options} options Positioning options compatible with\n\t * {@link module:utils/dom/position~getOptimalPosition}. Default `positions` array is\n\t * {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView.defaultPositions}.\n\t */\n\tattachTo( options ) {\n\t\tthis.show();\n\n\t\tconst defaultPositions = BalloonPanelView.defaultPositions;\n\t\tconst positionOptions = Object.assign( {}, {\n\t\t\telement: this.element,\n\t\t\tpositions: [\n\t\t\t\tdefaultPositions.southArrowNorth,\n\t\t\t\tdefaultPositions.southArrowNorthWest,\n\t\t\t\tdefaultPositions.southArrowNorthEast,\n\t\t\t\tdefaultPositions.northArrowSouth,\n\t\t\t\tdefaultPositions.northArrowSouthWest,\n\t\t\t\tdefaultPositions.northArrowSouthEast\n\t\t\t],\n\t\t\tlimiter: defaultLimiterElement,\n\t\t\tfitInViewport: true\n\t\t}, options );\n\n\t\tconst { top, left, name: position } = BalloonPanelView._getOptimalPosition( positionOptions );\n\n\t\tObject.assign( this, { top, left, position } );\n\t}\n\n\t/**\n\t * Works the same way as the {@link #attachTo} method except that the position of the panel is\n\t * continuously updated when:\n\t *\n\t * * any ancestor of the {@link module:utils/dom/position~Options#target}\n\t * or {@link module:utils/dom/position~Options#limiter} is scrolled,\n\t * * the browser window gets resized or scrolled.\n\t *\n\t * Thanks to that, the panel always sticks to the {@link module:utils/dom/position~Options#target},\n\t * immune to the changing environment.\n\t *\n\t *\t\tconst panel = new BalloonPanelView( locale );\n\t *\t\tconst positions = BalloonPanelView.defaultPositions;\n\t *\n\t *\t\tpanel.render();\n\t *\n\t *\t\t// Pin the panel to an element with the \"target\" id DOM.\n\t *\t\tpanel.pin( {\n\t *\t\t\ttarget: document.querySelector( '#target' ),\n\t *\t\t\tpositions: [\n\t *\t\t\t\tpositions.northArrowSouth,\n\t *\t\t\t\tpositions.southArrowNorth\n\t *\t\t\t]\n\t *\t\t} );\n\t *\n\t * To leave the pinned state, use the {@link #unpin} method.\n\t *\n\t * **Note**: Pinning the panel will also automatically {@link #show} it.\n\t *\n\t * @param {module:utils/dom/position~Options} options Positioning options compatible with\n\t * {@link module:utils/dom/position~getOptimalPosition}. Default `positions` array is\n\t * {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView.defaultPositions}.\n\t */\n\tpin( options ) {\n\t\tthis.unpin();\n\n\t\tthis._pinWhenIsVisibleCallback = () => {\n\t\t\tif ( this.isVisible ) {\n\t\t\t\tthis._startPinning( options );\n\t\t\t} else {\n\t\t\t\tthis._stopPinning();\n\t\t\t}\n\t\t};\n\n\t\tthis._startPinning( options );\n\n\t\t// Control the state of the listeners depending on whether the panel is visible\n\t\t// or not.\n\t\t// TODO: Use on() (https://github.com/ckeditor/ckeditor5-utils/issues/144).\n\t\tthis.listenTo( this, 'change:isVisible', this._pinWhenIsVisibleCallback );\n\t}\n\n\t/**\n\t * Stops pinning the panel, as set up by {@link #pin}.\n\t */\n\tunpin() {\n\t\tif ( this._pinWhenIsVisibleCallback ) {\n\t\t\t// Deactivate listeners attached by pin().\n\t\t\tthis._stopPinning();\n\n\t\t\t// Deactivate the panel pin() control logic.\n\t\t\t// TODO: Use off() (https://github.com/ckeditor/ckeditor5-utils/issues/144).\n\t\t\tthis.stopListening( this, 'change:isVisible', this._pinWhenIsVisibleCallback );\n\n\t\t\tthis._pinWhenIsVisibleCallback = null;\n\n\t\t\tthis.hide();\n\t\t}\n\t}\n\n\t/**\n\t * Starts managing the pinned state of the panel. See {@link #pin}.\n\t *\n\t * @private\n\t * @param {module:utils/dom/position~Options} options Positioning options compatible with\n\t * {@link module:utils/dom/position~getOptimalPosition}.\n\t */\n\t_startPinning( options ) {\n\t\tthis.attachTo( options );\n\n\t\tconst targetElement = getDomElement( options.target );\n\t\tconst limiterElement = options.limiter ? getDomElement( options.limiter ) : defaultLimiterElement;\n\n\t\t// Then we need to listen on scroll event of eny element in the document.\n\t\tthis.listenTo( global.document, 'scroll', ( evt, domEvt ) => {\n\t\t\tconst scrollTarget = domEvt.target;\n\n\t\t\t// The position needs to be updated if the positioning target is within the scrolled element.\n\t\t\tconst isWithinScrollTarget = targetElement && scrollTarget.contains( targetElement );\n\n\t\t\t// The position needs to be updated if the positioning limiter is within the scrolled element.\n\t\t\tconst isLimiterWithinScrollTarget = limiterElement && scrollTarget.contains( limiterElement );\n\n\t\t\t// The positioning target and/or limiter can be a Rect, object etc..\n\t\t\t// There's no way to optimize the listener then.\n\t\t\tif ( isWithinScrollTarget || isLimiterWithinScrollTarget || !targetElement || !limiterElement ) {\n\t\t\t\tthis.attachTo( options );\n\t\t\t}\n\t\t}, { useCapture: true } );\n\n\t\t// We need to listen on window resize event and update position.\n\t\tthis.listenTo( global.window, 'resize', () => {\n\t\t\tthis.attachTo( options );\n\t\t} );\n\t}\n\n\t/**\n\t * Stops managing the pinned state of the panel. See {@link #pin}.\n\t *\n\t * @private\n\t */\n\t_stopPinning() {\n\t\tthis.stopListening( global.document, 'scroll' );\n\t\tthis.stopListening( global.window, 'resize' );\n\t}\n}\n\n// Returns the DOM element for given object or null, if there's none,\n// e.g. when passed object is a Rect instance or so.\n//\n// @private\n// @param {*} object\n// @returns {HTMLElement|null}\nfunction getDomElement( object ) {\n\tif ( isElement( object ) ) {\n\t\treturn object;\n\t}\n\n\tif ( isRange( object ) ) {\n\t\treturn object.commonAncestorContainer;\n\t}\n\n\tif ( typeof object == 'function' ) {\n\t\treturn getDomElement( object() );\n\t}\n\n\treturn null;\n}\n\n/**\n * A horizontal offset of the arrow tip from the edge of the balloon. Controlled by CSS.\n *\n *\t\t +-----|---------...\n *\t\t |     |\n *\t\t |     |\n *\t\t |     |\n *\t\t |     |\n *\t\t +--+  |  +------...\n *\t\t     \\ | /\n *\t\t      \\|/\n *\t    >|-----|<---------------- horizontal offset\n *\n * @default 30\n * @member {Number} module:ui/panel/balloon/balloonpanelview~BalloonPanelView.arrowHorizontalOffset\n */\nBalloonPanelView.arrowHorizontalOffset = 25;\n\n/**\n * A vertical offset of the arrow from the edge of the balloon. Controlled by CSS.\n *\n *\t\t +-------------...\n *\t\t |\n *\t\t |\n *\t\t |                      /-- vertical offset\n *\t\t |                     V\n *\t\t +--+    +-----...    ---------\n *\t\t     \\  /              |\n *\t\t      \\/               |\n *\t\t-------------------------------\n *\t\t                       ^\n *\n * @default 15\n * @member {Number} module:ui/panel/balloon/balloonpanelview~BalloonPanelView.arrowVerticalOffset\n */\nBalloonPanelView.arrowVerticalOffset = 10;\n\n/**\n * Function used to calculate the optimal position for the balloon.\n *\n * @protected\n * @member {Function} module:ui/panel/balloon/balloonpanelview~BalloonPanelView._getOptimalPosition\n */\nBalloonPanelView._getOptimalPosition = getOptimalPosition;\n\n/**\n * A default set of positioning functions used by the balloon panel view\n * when attaching using {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView#attachTo} method.\n *\n * The available positioning functions are as follow:\n *\n * **North**\n *\n * * `northArrowSouth`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t         V\n * \t\t    [ Target ]\n *\n * * `northArrowSouthEast`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t               V\n * \t\t          [ Target ]\n *\n * * `northArrowSouthWest`\n *\n * \t\t  +-----------------+\n * \t\t  |     Balloon     |\n * \t\t  +-----------------+\n * \t\t     V\n * \t\t[ Target ]\n *\n * **North west**\n *\n * * `northWestArrowSouth`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t         V\n * \t\t         [ Target ]\n *\n * * `northWestArrowSouthWest`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t   V\n * \t\t   [ Target ]\n *\n * * `northWestArrowSouthEast`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t               V\n * \t\t               [ Target ]\n *\n * **North east**\n *\n * * `northEastArrowSouth`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t         V\n * \t\t[ Target ]\n *\n * * `northEastArrowSouthEast`\n *\n * \t\t+-----------------+\n * \t\t|     Balloon     |\n * \t\t+-----------------+\n * \t\t               V\n * \t\t      [ Target ]\n *\n * * `northEastArrowSouthWest`\n *\n * \t\t      +-----------------+\n * \t\t      |     Balloon     |\n * \t\t      +-----------------+\n * \t\t         V\n * \t\t[ Target ]\n *\n * **South**\n *\n * * `southArrowNorth`\n *\n *\t\t    [ Target ]\n *\t\t         ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southArrowNorthEast`\n *\n *\t\t          [ Target ]\n *\t\t               ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southArrowNorthWest`\n *\n *\t\t[ Target ]\n *\t\t     ^\n *\t\t   +-----------------+\n *\t\t   |     Balloon     |\n *\t\t   +-----------------+\n *\n * **South west**\n *\n * * `southWestArrowNorth`\n *\n *\t\t         [ Target ]\n *\t\t         ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southWestArrowNorthWest`\n *\n *\t\t  [ Target ]\n *\t\t  ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southWestArrowNorthEast`\n *\n *\t\t               [ Target ]\n *\t\t               ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * **South east**\n *\n * * `southEastArrowNorth`\n *\n *\t\t[ Target ]\n *\t\t         ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southEastArrowNorthEast`\n *\n *\t\t       [ Target ]\n *\t\t                ^\n *\t\t+-----------------+\n *\t\t|     Balloon     |\n *\t\t+-----------------+\n *\n * * `southEastArrowNorthWest`\n *\n *\t\t[ Target ]\n *\t\t         ^\n *\t\t       +-----------------+\n *\t\t       |     Balloon     |\n *\t\t       +-----------------+\n *\n * See {@link module:ui/panel/balloon/balloonpanelview~BalloonPanelView#attachTo}.\n *\n * Positioning functions must be compatible with {@link module:utils/dom/position~Position}.\n *\n * The name that position function returns will be reflected in balloon panel's class that\n * controls the placement of the \"arrow\". See {@link #position} to learn more.\n *\n * @member {Object} module:ui/panel/balloon/balloonpanelview~BalloonPanelView.defaultPositions\n */\nBalloonPanelView.defaultPositions = {\n\t// ------- North\n\n\tnorthArrowSouth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - balloonRect.width / 2,\n\t\tname: 'arrow_s'\n\t} ),\n\n\tnorthArrowSouthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_se'\n\t} ),\n\n\tnorthArrowSouthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_sw'\n\t} ),\n\n\t// ------- North west\n\n\tnorthWestArrowSouth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - balloonRect.width / 2,\n\t\tname: 'arrow_s'\n\t} ),\n\n\tnorthWestArrowSouthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_sw'\n\t} ),\n\n\tnorthWestArrowSouthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_se'\n\t} ),\n\n\t// ------- North east\n\n\tnorthEastArrowSouth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - balloonRect.width / 2,\n\t\tname: 'arrow_s'\n\t} ),\n\n\tnorthEastArrowSouthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_se'\n\t} ),\n\n\tnorthEastArrowSouthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getNorthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_sw'\n\t} ),\n\n\t// ------- South\n\n\tsouthArrowNorth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - balloonRect.width / 2,\n\t\tname: 'arrow_n'\n\t} ),\n\n\tsouthArrowNorthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_ne'\n\t} ),\n\n\tsouthArrowNorthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left + targetRect.width / 2 - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_nw'\n\t} ),\n\n\t// ------- South west\n\n\tsouthWestArrowNorth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - balloonRect.width / 2,\n\t\tname: 'arrow_n'\n\t} ),\n\n\tsouthWestArrowNorthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_nw'\n\t} ),\n\n\tsouthWestArrowNorthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.left - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_ne'\n\t} ),\n\n\t// ------- South east\n\n\tsouthEastArrowNorth: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - balloonRect.width / 2,\n\t\tname: 'arrow_n'\n\t} ),\n\n\tsouthEastArrowNorthEast: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - balloonRect.width + BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_ne'\n\t} ),\n\n\tsouthEastArrowNorthWest: ( targetRect, balloonRect ) => ( {\n\t\ttop: getSouthTop( targetRect, balloonRect ),\n\t\tleft: targetRect.right - BalloonPanelView.arrowHorizontalOffset,\n\t\tname: 'arrow_nw'\n\t} ),\n};\n\n// Returns the top coordinate for positions starting with `north*`.\n//\n// @private\n// @param {utils/dom/rect~Rect} targetRect A rect of the target.\n// @param {utils/dom/rect~Rect} elementRect A rect of the balloon.\n// @returns {Number}\nfunction getNorthTop( targetRect, balloonRect ) {\n\treturn targetRect.top - balloonRect.height - BalloonPanelView.arrowVerticalOffset;\n}\n\n// Returns the top coordinate for positions starting with `south*`.\n//\n// @private\n// @param {utils/dom/rect~Rect} targetRect A rect of the target.\n// @param {utils/dom/rect~Rect} elementRect A rect of the balloon.\n// @returns {Number}\nfunction getSouthTop( targetRect ) {\n\treturn targetRect.bottom + BalloonPanelView.arrowVerticalOffset;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/dom/getpositionedancestor\n */\n\nimport global from './global';\n\n/**\n * For a given element, returns the nearest ancestor element which CSS position is not \"static\".\n *\n * @param {HTMLElement} element Native DOM element to be checked.\n * @returns {HTMLElement|null}\n */\nexport default function getPositionedAncestor( element ) {\n\twhile ( element && element.tagName.toLowerCase() != 'html' ) {\n\t\tif ( global.window.getComputedStyle( element ).position != 'static' ) {\n\t\t\treturn element;\n\t\t}\n\n\t\telement = element.parentElement;\n\t}\n\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/panel/balloon/contextualballoon\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport BalloonPanelView from './balloonpanelview';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Provides the common contextual balloon panel for the editor.\n *\n * This plugin allows reusing a single {module:ui/panel/balloon/balloonpanelview~BalloonPanelView} instance\n * to display multiple contextual balloon panels in the editor.\n *\n * Child views of such a panel are stored in the stack and the last one in the stack is visible. When the\n * visible view is removed from the stack, the previous view becomes visible, etc. If there are no more\n * views in the stack, the balloon panel will hide.\n *\n * It simplifies managing the views and helps\n * avoid the unnecessary complexity of handling multiple {module:ui/panel/balloon/balloonpanelview~BalloonPanelView}\n * instances in the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ContextualBalloon extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ContextualBalloon';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\t/**\n\t\t * The common balloon panel view.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/panel/balloon/balloonpanelview~BalloonPanelView} #view\n\t\t */\n\t\tthis.view = new BalloonPanelView();\n\n\t\t/**\n\t\t * The {@link module:utils/dom/position~Options#limiter position limiter}\n\t\t * for the {@link #view}, used when no `limiter` has been passed into {@link #add}\n\t\t * or {@link #updatePosition}.\n\t\t *\n\t\t * By default, a function, which obtains the farthest DOM\n\t\t * {@link module:engine/view/rooteditableelement~RootEditableElement}\n\t\t * of the {@link module:engine/view/document~Document#selection}.\n\t\t *\n\t\t * @member {module:utils/dom/position~Options#limiter} #positionLimiter\n\t\t */\n\t\tthis.positionLimiter = () => {\n\t\t\tconst view = this.editor.editing.view;\n\t\t\tconst viewDocument = view.document;\n\t\t\tconst editableElement = viewDocument.selection.editableElement;\n\n\t\t\tif ( editableElement ) {\n\t\t\t\treturn view.domConverter.mapViewToDom( editableElement.root );\n\t\t\t}\n\n\t\t\treturn null;\n\t\t};\n\n\t\t/**\n\t\t * Stack of the views injected into the balloon. Last one in the stack is displayed\n\t\t * as a content of {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon#view}.\n\t\t *\n\t\t * @private\n\t\t * @member {Map} #_stack\n\t\t */\n\t\tthis._stack = new Map();\n\n\t\t// Add balloon panel view to editor `body` collection and wait until view will be ready.\n\t\tthis.editor.ui.view.body.add( this.view );\n\n\t\t// Editor should be focused when contextual balloon is focused.\n\t\tthis.editor.ui.focusTracker.add( this.view.element );\n\t}\n\n\t/**\n\t * Returns the currently visible view or `null` when there are no\n\t * views in the stack.\n\t *\n\t * @returns {module:ui/view~View|null}\n\t */\n\tget visibleView() {\n\t\tconst item = this._stack.get( this.view.content.get( 0 ) );\n\n\t\treturn item ? item.view : null;\n\t}\n\n\t/**\n\t * Returns `true` when the given view is in the stack. Otherwise returns `false`.\n\t *\n\t * @param {module:ui/view~View} view\n\t * @returns {Boolean}\n\t */\n\thasView( view ) {\n\t\treturn this._stack.has( view );\n\t}\n\n\t/**\n\t * Adds a new view to the stack and makes it visible.\n\t *\n\t * @param {Object} data Configuration of the view.\n\t * @param {module:ui/view~View} [data.view] Content of the balloon.\n\t * @param {module:utils/dom/position~Options} [data.position] Positioning options.\n\t * @param {String} [data.balloonClassName] Additional css class for {@link #view} added when given view is visible.\n\t */\n\tadd( data ) {\n\t\tif ( this.hasView( data.view ) ) {\n\t\t\t/**\n\t\t\t * Trying to add configuration of the same view more than once.\n\t\t\t *\n\t\t\t * @error contextualballoon-add-view-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'contextualballoon-add-view-exist: Cannot add configuration of the same view twice.' );\n\t\t}\n\n\t\t// When adding view to the not empty balloon.\n\t\tif ( this.visibleView ) {\n\t\t\t// Remove displayed content from the view.\n\t\t\tthis.view.content.remove( this.visibleView );\n\t\t}\n\n\t\t// Add new view to the stack.\n\t\tthis._stack.set( data.view, data );\n\n\t\t// And display it.\n\t\tthis._show( data );\n\t}\n\n\t/**\n\t * Removes the given view from the stack. If the removed view was visible,\n\t * then the view preceding it in the stack will become visible instead.\n\t * When there is no view in the stack then balloon will hide.\n\t *\n\t * @param {module:ui/view~View} view A view to be removed from the balloon.\n\t */\n\tremove( view ) {\n\t\tif ( !this.hasView( view ) ) {\n\t\t\t/**\n\t\t\t * Trying to remove configuration of the view not defined in the stack.\n\t\t\t *\n\t\t\t * @error contextualballoon-remove-view-not-exist\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'contextualballoon-remove-view-not-exist: Cannot remove configuration of not existing view.' );\n\t\t}\n\n\t\t// When visible view is being removed.\n\t\tif ( this.visibleView === view ) {\n\t\t\t// We need to remove it from the view content.\n\t\t\tthis.view.content.remove( view );\n\n\t\t\t// And then remove from the stack.\n\t\t\tthis._stack.delete( view );\n\n\t\t\t// Next we need to check if there is other view in stack to show.\n\t\t\tconst last = Array.from( this._stack.values() ).pop();\n\n\t\t\t// If it is some other view.\n\t\t\tif ( last ) {\n\t\t\t\t// Just show it.\n\t\t\t\tthis._show( last );\n\t\t\t} else {\n\t\t\t\t// Hide the balloon panel.\n\t\t\t\tthis.view.hide();\n\t\t\t}\n\t\t} else {\n\t\t\t// Just remove given view from the stack.\n\t\t\tthis._stack.delete( view );\n\t\t}\n\t}\n\n\t/**\n\t * Updates the position of the balloon using position data of the first visible view in the stack.\n\t * When new position data is given then position data of currently visible panel will be updated.\n\t *\n\t * @param {module:utils/dom/position~Options} [position] position options.\n\t */\n\tupdatePosition( position ) {\n\t\tif ( position ) {\n\t\t\tthis._stack.get( this.visibleView ).position = position;\n\t\t}\n\n\t\tthis.view.pin( this._getBalloonPosition() );\n\t}\n\n\t/**\n\t * Sets the view as a content of the balloon and attaches balloon using position\n\t * options of the first view.\n\t *\n\t * @private\n\t * @param {Object} data Configuration.\n\t * @param {module:ui/view~View} [data.view] View to show in the balloon.\n\t * @param {String} [data.balloonClassName=''] Additional class name which will added to the {#_balloon} view.\n\t */\n\t_show( { view, balloonClassName = '' } ) {\n\t\tthis.view.className = balloonClassName;\n\n\t\tthis.view.content.add( view );\n\t\tthis.view.pin( this._getBalloonPosition() );\n\t}\n\n\t/**\n\t * Returns position options of the last view in the stack.\n\t * This keeps the balloon in the same position when view is changed.\n\t *\n\t * @private\n\t * @returns {module:utils/dom/position~Options}\n\t */\n\t_getBalloonPosition() {\n\t\tlet position = Array.from( this._stack.values() ).pop().position;\n\n\t\t// Use the default limiter if none has been specified.\n\t\tif ( position && !position.limiter ) {\n\t\t\t// Don't modify the original options object.\n\t\t\tposition = Object.assign( {}, position, {\n\t\t\t\tlimiter: this.positionLimiter\n\t\t\t} );\n\t\t}\n\n\t\treturn position;\n\t}\n}\n","import imageIcon from '../icons/edit.svg';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nexport function createToolbarEditButton(editor, name, callback) {\n\t// Add editing button\n\teditor.ui.componentFactory.add( name, locale => {\n\t\tconst view = new ButtonView( locale );\n\n\t\tview.set( {\n\t\t\tlabel: I18n.t('js.button_edit'),\n\t\t\ticon: imageIcon,\n\t\t\ttooltip: true\n\t\t} );\n\n\t\t// Callback executed once the widget is clicked.\n\t\tview.on( 'execute', () => {\n\n\t\t\tconst widget = editor.model.document.selection.getSelectedElement();\n\n\t\t\tif (!widget) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tcallback(widget);\n\t\t} );\n\n\t\treturn view;\n\t} );\n}\n","import ToolbarView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarview';\nimport BalloonPanelView from '@ckeditor/ckeditor5-ui/src/panel/balloon/balloonpanelview';\n\nconst balloonClassName = 'ck-toolbar-container';\n\nexport function createEditToolbar(\n\t// Plugin instance\n\tplugin,\n\t// Editor instance\n\teditor,\n\t// Configuration namespace in op-ckeditor.js\n\tconfig_namespace,\n\t// Callback to check if widget is selected\n\tisWidgetSelected\n) {\n\n\tconst toolbarConfig = editor.config.get( config_namespace + '.toolbar' );\n\n\t// Don't add the toolbar if there is no configuration.\n\tif ( !toolbarConfig || !toolbarConfig.length ) {\n\t\treturn;\n\t}\n\n\tconst _balloon = editor.plugins.get( 'ContextualBalloon' );\n\tconst _toolbar = new ToolbarView();\n\n\tfunction _checkIsVisible() {\n\t\tif ( !editor.ui.focusTracker.isFocused ) {\n\t\t\t_hideToolbar();\n\t\t} else {\n\t\t\tif ( isWidgetSelected(editor.editing.view.document.selection ) ) {\n\t\t\t\t_showToolbar();\n\t\t\t} else {\n\t\t\t\t_hideToolbar();\n\t\t\t}\n\t\t}\n\t}\n\n\tfunction _showToolbar() {\n\t\tif ( _isVisible() ) {\n\t\t\trepositionContextualBalloon( editor, isWidgetSelected );\n\t\t} else if ( !_balloon.hasView( _toolbar ) ) {\n\t\t\t_balloon.add( {\n\t\t\t\tview: _toolbar,\n\t\t\t\tposition: getBalloonPositionData( editor ),\n\t\t\t\tballoonClassName\n\t\t\t} );\n\t\t}\n\t}\n\n\tfunction _hideToolbar() {\n\t\tif ( !_isVisible() ) {\n\t\t\treturn;\n\t\t}\n\n\t\t_balloon.remove( _toolbar );\n\t}\n\n\tfunction _isVisible() {\n\t\treturn _balloon.visibleView == _toolbar;\n\t}\n\n\t// Add buttons to the toolbar.\n\t_toolbar.fillFromConfig( toolbarConfig, editor.ui.componentFactory );\n\n\t// Show balloon panel each time the widget is selected.\n\t// TODO: This has changed in master with https://github.com/ckeditor/ckeditor5-image/pull/215\n\tplugin.listenTo( editor.editing.view, 'render', _checkIsVisible);\n\n\t// UI#update is not fired after focus is back in editor, we need to check if balloon panel should be visible.\n\tplugin.listenTo( editor.ui.focusTracker, 'change:isFocused', _checkIsVisible, { priority: 'low' } );\n}\n\n\n/**\n * A helper utility that positions the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} instance\n * with respect to the element in the editor content, if one is selected.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nfunction repositionContextualBalloon( editor, selectionCallback ) {\n\tconst balloon = editor.plugins.get( 'ContextualBalloon' );\n\n\tif ( selectionCallback( editor.editing.view.document.selection ) ) {\n\t\tconst position = getBalloonPositionData( editor );\n\n\t\tballoon.updatePosition( position );\n\t}\n}\n\n\n/**\n * Returns the positioning options that control the geometry of the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} with respect\n * to the selected element in the editor content.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n * @returns {module:utils/dom/position~Options}\n */\nfunction getBalloonPositionData( editor ) {\n\tconst editingView = editor.editing.view;\n\tconst defaultPositions = BalloonPanelView.defaultPositions;\n\n\treturn {\n\t\ttarget: editingView.domConverter.viewToDom( editingView.document.selection.getSelectedElement() ),\n\t\tpositions: [\n\t\t\tdefaultPositions.northArrowSouth,\n\t\t\tdefaultPositions.northArrowSouthWest,\n\t\t\tdefaultPositions.northArrowSouthEast,\n\t\t\tdefaultPositions.southArrowNorth,\n\t\t\tdefaultPositions.southArrowNorthWest,\n\t\t\tdefaultPositions.southArrowNorthEast\n\t\t]\n\t};\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\n\nimport {isEmbeddedTableWidgetSelected} from './utils';\nimport {createToolbarEditButton} from '../../helpers/create-toolbar-edit-button';\nimport {createEditToolbar} from '../../helpers/create-toolbar';\n\n\nconst balloonClassName = 'ck-toolbar-container';\n\nexport default class EmbeddedTableToolbar extends Plugin {\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'EmbeddedTableToolbar';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Add editing button\n\t\tcreateToolbarEditButton( editor, 'opEditEmbeddedTableQuery', widget => {\n\t\t\tconst externalQueryConfiguration = pluginContext.services.externalQueryConfiguration;\n\t\t\tconst currentQuery = widget.getAttribute('opEmbeddedTableQuery') || {};\n\n\t\t\texternalQueryConfiguration.show(\n\t\t\t\tcurrentQuery,\n\t\t\t\t(newQuery) => model.change(writer => {\n\t\t\t\t\twriter.setAttribute( 'opEmbeddedTableQuery', newQuery, widget );\n\t\t\t\t})\n\t\t\t);\n\t\t} );\n\t}\n\n\tafterInit() {\n\t\t// Add actual toolbar\n\t\tcreateEditToolbar(\n\t\t\tthis,\n\t\t\tthis.editor,\n\t\t\t'OPMacroEmbeddedTable',\n\t\t\tisEmbeddedTableWidgetSelected\n\t\t);\n\t}\n}\n","const wpButtonMacroSymbol = Symbol( 'isWpButtonMacroSymbol' );\nimport {toWidget, isWidget} from '@ckeditor/ckeditor5-widget/src/utils';\n\nexport function toWpButtonMacroWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( wpButtonMacroSymbol, true, viewElement );\n\treturn toWidget( viewElement, writer, { label: label });\n}\n\n\nexport function isWpButtonMacroWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( wpButtonMacroSymbol ) && isWidget( viewElement );\n}\n\n\nexport function isWpButtonMacroWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isWpButtonMacroWidget( viewElement ) );\n}\n","import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {upcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport {toWpButtonMacroWidget} from './utils';\n\nexport default class OPMacroWpButtonEditing extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPMacroWpButtonEditing';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn 'insertWorkPackageButton';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst conversion = editor.conversion;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'op-macro-wp-button', {\n\t\t\tallowWhere: ['$block'],\n\t\t\tallowAttributes: ['type', 'classes'],\n\t\t\tisBlock: true,\n\t\t    isLimit: true\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'macro',\n\t\t\t\t\tclasses: 'create_work_package_link'\n\t\t\t\t},\n\t\t\t\tmodel: ( viewElement, modelWriter ) => {\n\t\t\t\t\tconst type = viewElement.getAttribute( 'data-type' ) || '';\n\t\t\t\t\tconst classes = viewElement.getAttribute( 'data-classes' ) || '';\n\n\t\t\t\t\treturn modelWriter.createElement(\n\t\t\t\t\t\t'op-macro-wp-button',\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\ttype: type,\n\t\t\t\t\t\t\tclasses: classes\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} ) );\n\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastElementToElement({\n\t\t\tmodel: 'op-macro-wp-button',\n\t\t\tview: (modelElement, writer) => {\n\t\t\t\treturn this.createMacroViewElement(modelElement, writer);\n\t\t\t}\n\t    } ));\n\n\t\tconversion.for('dataDowncast').add(downcastElementToElement({\n\t\t\tmodel: 'op-macro-wp-button',\n\t\t\tview: (modelElement, writer) => {\n\t\t\t\tconst element = writer.createContainerElement(\n\t\t\t\t\t'macro',\n\t\t\t\t\t{\n\t\t\t\t\t\t'class': 'create_work_package_link',\n\t\t\t\t\t\t'data-type': modelElement.getAttribute('type') || '',\n\t\t\t\t\t\t'data-classes': modelElement.getAttribute('classes') || '',\n\t\t\t\t\t}\n\t\t\t\t);\n\n\t\t\t\treturn element;\n\t\t\t}\n\t\t}));\n\n\t\teditor.ui.componentFactory.add( OPMacroWpButtonEditing.buttonName, locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: window.I18n.t('js.editor.macro.work_package_button.button'),\n\t\t\t\twithText: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\tconst macroService = pluginContext.services.macros;\n\n\t\t\t\tmacroService\n\t\t\t\t\t.configureWorkPackageButton()\n\t\t\t\t\t.then((result) => editor.model.change(writer => {\n\t\t\t\t\t\tconst element = writer.createElement( 'op-macro-wp-button', {});\n\t\t\t\t\t\twriter.setAttribute( 'type', result.type, element );\n\t\t\t\t\t\twriter.setAttribute( 'classes', result.classes, element );\n\n\t\t\t\t\t\teditor.model.insertContent( element, editor.model.document.selection );\n\t\t\t\t\t})\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tmacroLabel(type) {\n\t\tif (type) {\n\t\t\treturn window.I18n.t('js.editor.macro.work_package_button.with_type', { typename: type });\n\t\t} else {\n\t\t\treturn window.I18n.t('js.editor.macro.work_package_button.without_type');\n\t\t}\n\t}\n\n\tcreateMacroViewElement(modelElement, writer) {\n\t\tconst type = modelElement.getAttribute('type');\n\t\tconst classes = modelElement.getAttribute('classes') || '';\n\t\tconst label = this.macroLabel(); // TODO: Pass type, it is not updated on coming back from the modal..\n\t\tconst placeholder = writer.createText( label );\n\t\tconst container = writer.createContainerElement( 'span', { class: 'macro -create_work_package_link ' + classes } );\n\n\t\twriter.insert( ViewPosition.createAt( container ), placeholder );\n\t\treturn toWpButtonMacroWidget(container, writer, { label: label } )\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\n\nimport {isWpButtonMacroWidgetSelected} from './utils';\nimport {createToolbarEditButton} from '../../helpers/create-toolbar-edit-button';\nimport {createEditToolbar} from '../../helpers/create-toolbar';\n\n\nconst balloonClassName = 'ck-toolbar-container';\n\nexport default class OPMacroWpButtonToolbar extends Plugin {\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPMacroWpButtonToolbar';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Add editing button\n\t\tcreateToolbarEditButton( editor, 'opEditWpMacroButton', widget => {\n\t\t\tconst macroService = pluginContext.services.macros;\n\t\t\tconst type = widget.getAttribute('type');\n\t\t\tconst classes = widget.getAttribute('classes');\n\n\t\t\tmacroService\n\t\t\t\t.configureWorkPackageButton(type, classes)\n\t\t\t\t.then((result) => editor.model.change(writer => {\n\t\t\t\t\twriter.setAttribute( 'classes', result.classes, widget );\n\t\t\t\t\twriter.setAttribute( 'type', result.type, widget );\n\t\t\t\t})\n\t\t\t);\n\t\t} );\n\t}\n\n\tafterInit() {\n\t\t// Add actual toolbar\n\t\tcreateEditToolbar(\n\t\t\tthis,\n\t\t\tthis.editor,\n\t\t\t'OPMacroWpButton',\n\t\t\tisWpButtonMacroWidgetSelected\n\t\t);\n\t}\n}\n","const wikiIncludeMacroSymbol = Symbol( 'isWpButtonMacroSymbol' );\nimport {toWidget, isWidget} from '@ckeditor/ckeditor5-widget/src/utils';\n\nexport function toWikiIncludeMacroWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( wikiIncludeMacroSymbol, true, viewElement );\n\treturn toWidget( viewElement, writer, { label: label });\n}\n\n\nexport function isWikiIncludeMacroWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( wikiIncludeMacroSymbol ) && isWidget( viewElement );\n}\n\n\nexport function isWikiIncludeMacroWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isWikiIncludeMacroWidget( viewElement ) );\n}\n","import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {upcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport {toWikiIncludeMacroWidget} from './utils';\nimport ViewRange from \"@ckeditor/ckeditor5-engine/src/view/range\";\n\nexport default class OPWikiIncludePageEditing extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPWikiIncludePageEditing';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn 'insertWikiPageInclude';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst conversion = editor.conversion;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'op-macro-wiki-page-include', {\n\t\t\tallowWhere: ['$block'],\n\t\t\tallowAttributes: ['page'],\n\t\t\tisBlock: true,\n\t\t    isLimit: true\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'macro',\n\t\t\t\t\tclasses: 'include_wiki_page'\n\t\t\t\t},\n\t\t\t\tmodel: ( viewElement, modelWriter ) => {\n\t\t\t\t\tconst page = viewElement.getAttribute( 'data-page' ) || '';\n\n\t\t\t\t\treturn modelWriter.createElement(\n\t\t\t\t\t\t'op-macro-wiki-page-include',\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\tpage: page\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} ) );\n\n\n\t\tconversion.for( 'editingDowncast' )\n\t\t\t.add( downcastElementToElement({\n\t\t\t\tmodel: 'op-macro-wiki-page-include',\n\t\t\t\tview: (modelElement, writer) => {\n\t\t\t\t\treturn this.createMacroViewElement(modelElement, writer);\n\t\t\t\t}\n\t\t\t}))\n\t\t\t.add(dispatcher => dispatcher.on( 'attribute:page', this.modelAttributeToView.bind(this)));\n\n\t\tconversion.for('dataDowncast').add(downcastElementToElement({\n\t\t\tmodel: 'op-macro-wiki-page-include',\n\t\t\tview: (modelElement, writer) => {\n\t\t\t\tconst element = writer.createContainerElement(\n\t\t\t\t\t'macro',\n\t\t\t\t\t{\n\t\t\t\t\t\t'class': 'include_wiki_page',\n\t\t\t\t\t\t'data-page': modelElement.getAttribute('page') || '',\n\t\t\t\t\t}\n\t\t\t\t);\n\n\t\t\t\treturn element;\n\t\t\t}\n\t\t}));\n\n\t\teditor.ui.componentFactory.add( OPWikiIncludePageEditing.buttonName, locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: window.I18n.t('js.editor.macro.wiki_page_include.button'),\n\t\t\t\twithText: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\tconst macroService = pluginContext.services.macros;\n\n\t\t\t\tmacroService\n\t\t\t\t\t.configureWikiPageInclude()\n\t\t\t\t\t.then((page) => editor.model.change(writer => {\n\t\t\t\t\t\tconst element = writer.createElement( 'op-macro-wiki-page-include', {});\n\t\t\t\t\t\twriter.setAttribute( 'page', page, element );\n\n\t\t\t\t\t\teditor.model.insertContent( element, editor.model.document.selection );\n\t\t\t\t\t})\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tmodelAttributeToView( evt, data, conversionApi ) {\n\t\tconst modelElement = data.item;\n\t\tif (!modelElement.is('op-macro-wiki-page-include')) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Mark element as consumed by conversion.\n\t\tconversionApi.consumable.consume(data.item, evt.name);\n\n\t\t// Get mapped view element to update.\n\t\tconst viewElement = conversionApi.mapper.toViewElement(modelElement);\n\n\t\t// Remove current <div> element contents.\n\t\tconversionApi.writer.remove(ViewRange.createIn(viewElement));\n\n\t\t// Set current content\n\t\tthis.setPlaceholderContent(conversionApi.writer, modelElement, viewElement);\n\t}\n\n\tmacroLabel() {\n\t\treturn window.I18n.t('js.editor.macro.wiki_page_include.text');\n\t}\n\n\tpageLabel(page) {\n\t\tif (page && page.length > 0) {\n\t\t\treturn page\n\t\t} else {\n\t\t\treturn window.I18n.t('js.editor.macro.wiki_page_include.this_page');\n\t\t}\n\t}\n\n\tcreateMacroViewElement(modelElement, writer) {\n\t\tconst placeholderContainer = writer.createContainerElement( 'div', { class: 'macro -wiki_page_include' } );\n\n\t\tthis.setPlaceholderContent( writer, modelElement, placeholderContainer );\n\n\t\treturn toWikiIncludeMacroWidget(placeholderContainer, writer, { label: this.macroLabel() } )\n\t}\n\n\tsetPlaceholderContent(writer, modelElement, placeholderContainer ) {\n\t\tconst page = modelElement.getAttribute('page');\n\t\tconst macroLabel = this.macroLabel();\n\t\tconst pageLabel = this.pageLabel(page);\n\t\tconst pageLabelContainer = writer.createContainerElement( 'span', { class: 'macro-value' } );\n\t\tlet placeholderContent = [ writer.createText( `${macroLabel} ` ) ];\n\t\twriter.insert( ViewPosition.createAt( pageLabelContainer ), writer.createText( `${pageLabel}` ) )\n\t\tplaceholderContent.push( pageLabelContainer );\n\n\t\twriter.insert( ViewPosition.createAt( placeholderContainer ), placeholderContent );\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\n\nimport {isWikiIncludeMacroWidgetSelected} from './utils';\nimport {createToolbarEditButton} from '../../helpers/create-toolbar-edit-button';\nimport {createEditToolbar} from '../../helpers/create-toolbar';\n\n\nconst balloonClassName = 'ck-toolbar-container';\n\nexport default class OPWikiIncludePageToolbar extends Plugin {\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPWikiIncludePageToolbar';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Add editing button\n\t\tcreateToolbarEditButton( editor, 'opEditWikiIncludeMacroButton', widget => {\n\t\t\tconst macroService = pluginContext.services.macros;\n\t\t\tconst page = widget.getAttribute('page');\n\n\t\t\tmacroService\n\t\t\t\t.configureWikiPageInclude(page)\n\t\t\t\t.then((newPage) => editor.model.change(writer => {\n\t\t\t\t\twriter.setAttribute( 'page', newPage, widget );\n\t\t\t\t})\n\t\t\t);\n\t\t} );\n\t}\n\n\tafterInit() {\n\t\t// Add actual toolbar\n\t\tcreateEditToolbar(\n\t\t\tthis,\n\t\t\tthis.editor,\n\t\t\t'OPWikiIncludePage',\n\t\t\tisWikiIncludeMacroWidgetSelected\n\t\t);\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/command\n */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * The base class for CKEditor commands.\n *\n * Commands are the main way to manipulate editor contents and state. They are mostly used by UI elements (or by other\n * commands) to make changes in the model. Commands are available in every part of code that has access to\n * the {@link module:core/editor/editor~Editor editor} instance.\n *\n * Instances of registered commands can be retrieved from {@link module:core/editor/editor~Editor#commands}.\n * The easiest way to execute a command is through {@link module:core/editor/editor~Editor#execute}.\n *\n * By default commands are disabled when the editor is in {@link module:core/editor/editor~Editor#isReadOnly read-only} mode.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Command {\n\t/**\n\t * Creates a new `Command` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor Editor on which this command will be used.\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * The editor on which this command will be used.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor}\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * The value of a command. Concrete command class should define what it represents.\n\t\t *\n\t\t * For example, the `bold` command's value is whether the selection starts in a bolded text.\n\t\t * And the value of the `link` command may be an object with links details.\n\t\t *\n\t\t * It's possible for a command to have no value (e.g. for stateless actions such as `imageUpload`).\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member #value\n\t\t */\n\t\tthis.set( 'value', undefined );\n\n\t\t/**\n\t\t * Flag indicating whether a command is enabled or disabled.\n\t\t * A disabled command should do nothing when executed.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #isEnabled\n\t\t */\n\t\tthis.set( 'isEnabled', false );\n\n\t\tthis.decorate( 'execute' );\n\n\t\t// By default every command is refreshed when changes are applied to the model.\n\t\tthis.listenTo( this.editor.model.document, 'change', () => {\n\t\t\tthis.refresh();\n\t\t} );\n\n\t\tthis.on( 'execute', evt => {\n\t\t\tif ( !this.isEnabled ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'high' } );\n\n\t\t// By default commands are disabled when the editor is in read-only mode.\n\t\tthis.listenTo( editor, 'change:isReadOnly', ( evt, name, value ) => {\n\t\t\tif ( value ) {\n\t\t\t\tthis.on( 'set:isEnabled', forceDisable, { priority: 'highest' } );\n\t\t\t\tthis.isEnabled = false;\n\t\t\t} else {\n\t\t\t\tthis.off( 'set:isEnabled', forceDisable );\n\t\t\t\tthis.refresh();\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Refreshes the command. The command should update its {@link #isEnabled} and {@link #value} property\n\t * in this method.\n\t *\n\t * This method is automatically called when\n\t * {@link module:engine/model/document~Document#event:change any changes are applied to the document}.\n\t */\n\trefresh() {\n\t\tthis.isEnabled = true;\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * A command may accept parameters. They will be passed from {@link module:core/editor/editor~Editor#execute}\n\t * to the command.\n\t *\n\t * The `execute()` method will automatically abort when the command is disabled ({@link #isEnabled} is `false`).\n\t * This behavior is implemented by a high priority listener to the {@link #event:execute} event.\n\t *\n\t * @fires execute\n\t */\n\texecute() {}\n\n\t/**\n\t * Destroys the command.\n\t */\n\tdestroy() {\n\t\tthis.stopListening();\n\t}\n\n\t/**\n\t * Event fired by the {@link #execute} method. The command action is a listener to this event so it's\n\t * possible to change/cancel the behavior of the command by listening to this event.\n\t *\n\t * See {@link module:utils/observablemixin~ObservableMixin.decorate} for more information and samples.\n\t *\n\t * **Note:** This event is fired even if command is disabled. However, it is automatically blocked\n\t * by a high priority listener in order to prevent command execution.\n\t *\n\t * @event execute\n\t */\n}\n\nmix( Command, ObservableMixin );\n\n// Helper function that forces command to be disabled.\nfunction forceDisable( evt ) {\n\tevt.return = false;\n\tevt.stop();\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module enter/entercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * Enter command. It is used by the {@link module:enter/enter~Enter Enter feature} to handle the <kbd>Enter</kbd> key.\n *\n * @extends module:core/command~Command\n */\nexport default class EnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tenterBlock( this.editor.model, writer, doc.selection, model.schema );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n}\n\n// Creates a new block in the way that the <kbd>Enter</kbd> key is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\n// @param {module:engine/model/schema~Schema} schema\nfunction enterBlock( model, writer, selection, schema ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Don't touch the roots and other limit elements.\n\tif ( schema.isLimit( startElement ) || schema.isLimit( endElement ) ) {\n\t\t// Delete the selected content but only if inside a single limit element.\n\t\t// Abort, when crossing limit elements boundary (e.g. <limit1>x[x</limit1>donttouchme<limit2>y]y</limit2>).\n\t\t// This is an edge case and it's hard to tell what should actually happen because such a selection\n\t\t// is not entirely valid.\n\t\tif ( !isSelectionEmpty && startElement == endElement ) {\n\t\t\tmodel.deleteContent( selection );\n\t\t}\n\n\t\treturn;\n\t}\n\n\tif ( isSelectionEmpty ) {\n\t\tsplitBlock( writer, selection, range.start );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\tif ( leaveUnmerged ) {\n\t\t\t// Partially selected elements.\n\t\t\t//\n\t\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x</h><h>^x</h>\n\t\t\tif ( isContainedWithinOneElement ) {\n\t\t\t\tsplitBlock( writer, selection, selection.focus );\n\t\t\t}\n\t\t\t// Selection over multiple elements.\n\t\t\t//\n\t\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t\telse {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction splitBlock( writer, selection, splitPos ) {\n\tconst oldElement = splitPos.parent;\n\tconst newElement = new oldElement.constructor( oldElement.name, oldElement.getAttributes() );\n\n\tif ( splitPos.isAtEnd ) {\n\t\t// If the split is at the end of element, instead of splitting, just create a clone of position's parent\n\t\t// element and insert it after split element. The result is the same but less operations are done\n\t\t// and it's more semantically correct (when it comes to operational transformation).\n\t\twriter.insert( newElement, splitPos.parent, 'after' );\n\t} else if ( splitPos.isAtStart ) {\n\t\t// If the split is at the start of element, instead of splitting, just create a clone of position's parent\n\t\t// element and insert it before split element. The result is the same but less operations are done\n\t\t// and it's more semantically correct (when it comes to operational transformation).\n\t\twriter.insert( newElement, splitPos.parent, 'before' );\n\t} else {\n\t\twriter.split( splitPos );\n\t}\n\n\twriter.setSelection( splitPos.parent.nextSibling, 0 );\n}\n","import EnterCommand from \"@ckeditor/ckeditor5-enter/src/entercommand\"\n\nexport default class AtJsEnterCommand extends EnterCommand {\n\n\texecute() {\n\t\tif (!this.atJsOpen) {\n\t\t\tsuper.execute()\n\t\t}\n\t}\n\n\tget isAtJsOpen() {\n\t\treturn this.atJsOpen;\n\t}\n\n\tset isAtJsOpen(value) {\n\t\tthis.atJsOpen = value;\n\t}\n}\n","export function setupAtJs(editor, options) {\n\tlet editable;\n\n\tlet reconstructRangeFromCurrentPosition = function (query) {\n\t\tlet $query = newAtJsSpan(this.app.document);\n\t\tlet range = this._getRange();\n\t\tlet index = range.startOffset - this.at.length - query.length;\n\n\t\trange.setStart(range.startContainer, index);\n\n\t\tthis.currentRangeProperties = {current: range, start: index, end: range.endOffset};\n\n\t\trange.surroundContents($query.get(0));\n\n\t\treturn $query;\n\t};\n\n\tlet reconstructRangeFromCurrentProperties = function () {\n\t\tlet $query = newAtJsSpan(this.app.document);\n\t\tlet currentRange = this.currentRangeProperties.current;\n\t\tlet range = currentRange.cloneRange();\n\t\tlet startTextNode = currentRange.startContainer.childNodes[0];\n\t\tlet endTextNode = currentRange.endContainer.childNodes[0];\n\n\t\trange.setStart(startTextNode, this.currentRangeProperties.start);\n\t\trange.setEnd(endTextNode, this.currentRangeProperties.end);\n\t\trange.surroundContents($query.get(0));\n\n\t\treturn $query;\n\t};\n\n\tlet newAtJsSpan = function (doc) {\n\t\treturn jQuery('<span/>', doc).addClass('atwho-query');\n\t};\n\n\tlet config = jQuery.extend({}, {\n\t\tat: '#',\n\t\tstartWithSpace: false,\n\t\tsearchKey: 'id_subject',\n\t\tdisplayTpl: '<li data-value=\"${atwho-at}${id}\">${to_s}</li>',\n\t\tinsertTpl: \"${atwho-at}${id}\",\n\t\tlimit: 10,\n\t\tcallbacks: {\n\t\t\tmatcher: function(flag, subtext, should_startWithSpace, acceptSpaceBar) {\n\t\t\t\tif (options.ignorePrefix && subtext.match(options.ignorePrefix)) {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tlet defaultMatcher = jQuery.fn.atwho.default.callbacks.matcher;\n\t\t\t\treturn defaultMatcher.call(this, flag, subtext, should_startWithSpace, acceptSpaceBar);\n\t\t\t},\n\n\t\t\t/*\n             Readd the 'span.atwho-query' used for positioning the dropdown.\n             The ckeditor will have removed the span added by at.js.\n             The functionality mimics at.js' behaviour. It additionally stores the information in the at.js instance\n             for later retrieval (#beforeInsert) when we again need to reconstruct the span.\n            */\n\t\t\tremoteFilter: function (query, callback) {\n\t\t\t\tlet that = this;\n\n\t\t\t\tthis.getOpt('remoteUrl')(query, function (data) {\n\t\t\t\t\tif (data) {\n\t\t\t\t\t\tdata = that.getOpt('remoteDataPreparation').call(that, data);\n\n\t\t\t\t\t\tthat.query.el = reconstructRangeFromCurrentPosition.call(that, query);\n\n\t\t\t\t\t\tif (jQuery(editable).is(':visible')) {\n\t\t\t\t\t\t\tcallback(data);\n\t\t\t\t\t\t}\n\t\t\t\t\t\telse {\n\t\t\t\t\t\t\t// discard the results if the textarea is no longer visible,\n\t\t\t\t\t\t\t// i.e. nobody cares for the results\n\t\t\t\t\t\t\tcallback([]);\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t});\n\t\t\t},\n\t\t\t/*\n              Override default sorting to not sort as that is already done in the backend\n            */\n\t\t\tsorter: function (query, items, search_key) {\n\t\t\t\treturn items;\n\t\t\t},\n\t\t\t/*\n              Readd the 'span.atwho-query' used for positioning the dropdown.\n              The ckeditor will have removed the span added by us in the remoteFilter callback again.\n              We rely on the information used in the remoteFilter callback to reconstruct the correct range we than surround with the span\n              but cannot use the exact same range as ranges keep track of changes to the dom. As the span gets removed by ckeditor, the span\n              is no longer part of the dom and the range points to an unattached fragement.\n              For unknown reasons, the range's start- and end-container also buble up one level which is why we need to take their first\n              child element, a text node, again.\n            */\n\t\t\tbeforeInsert: function (value, $li, e) {\n\t\t\t\tthis.query.el = reconstructRangeFromCurrentProperties.call(this);\n\n\t\t\t\treturn value;\n\n\t\t\t}\n\t\t},\n\t\tfunctionOverrides: {\n\t\t\t/*\n              Override the insert function. This is basically a copy of at.js' insert function with the focus\n              functionality removed.\n              The default insert function set the focus to the beginning of the editor field as it focused the contenteditable editor.\n              This is undesirable if there is an embedded contenteditable e.g. the tds of a table in which the string is inserted. The focus should\n              stay in that td.\n            */\n\t\t\tinsert: function (content, $li) {\n\t\t\t\tlet data, range, suffix, suffixNode;\n\t\t\t\tsuffix = (suffix = this.getOpt('suffix')) === \"\" ? suffix : suffix || \"\\u00A0\";\n\t\t\t\tdata = $li.data('item-data');\n\t\t\t\tthis.query.el.removeClass('atwho-query').addClass('atwho-inserted').html(content).attr('data-atwho-at-query', \"\" + data['atwho-at'] + this.query.text).attr('contenteditable', \"false\");\n\t\t\t\tif (range = this._getRange()) {\n\t\t\t\t\tif (this.query.el.length) {\n\t\t\t\t\t\trange.setEndAfter(this.query.el[0]);\n\t\t\t\t\t}\n\t\t\t\t\trange.collapse(false);\n\t\t\t\t\trange.insertNode(suffixNode = this.app.document.createTextNode(\"\" + suffix));\n\t\t\t\t\tthis._setRange('after', suffixNode, range);\n\t\t\t\t}\n\t\t\t\treturn this.$inputor.change();\n\t\t\t}\n\t\t}\n\t}, options);\n\n\teditor.model.document.once('change', () => {\n\t\tif (options.isSupportedContext && !options.isSupportedContext()) {\n\t\t\treturn;\n\t\t}\n\n\t\teditable = jQuery(editor.element);\n\n\t\tif (!editable.is('.ck-editor__editable')) {\n\t\t\teditable = editable.closest('.op-ckeditor--wrapper').find('.ck-editor__editable');\n\t\t}\n\n\t\teditable.atwho(config);\n\n\t\t// disable enter when atwho is displayed, reenable it once atwho is done\n\t\tjQuery(editable)\n\t\t\t.on('shown.atwho', () => {\n\t\t\t\teditor.commands.get(\"enter\").isAtJsOpen = true;\n\t\t\t})\n\t\t\t.on('hidden.atwho', () => {\n\t\t\t\teditor.commands.get(\"enter\").isAtJsOpen = false;\n\t\t\t});\n\n\t});\n}\n","export function getOP(editor) {\n\treturn editor.config.get('openProject');\n}\n\nexport function getOPService(editor, name) {\n\treturn editor.config.get('openProject.pluginContext').services[name];\n}\n\nexport function getOPResource(editor) {\n\treturn editor.config.get('openProject.context.resource');\n}\n\nexport function getOPPreviewContext(editor) {\n\treturn editor.config.get('openProject.context.previewContext');\n}\n\nexport function getOPPath(editor, pathName) {\n\treturn getOPService(editor,'pathHelperService');\n\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module core/pendingactions\n */\n\nimport Plugin from './plugin';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * The list of pending editor actions.\n *\n * This plugin should be used to synchronise plugins that execute long-lasting actions\n * (e.g. file upload) with the editor integration. It gives the developer who integrates the editor\n * an easy way to check if there are any actions pending whenever such information is needed.\n * All plugins that register a pending action also provide a message about the action that is ongoing\n * which can be displayed to the user. This lets them decide if they want to interrupt the action or wait.\n *\n * Adding and updating a pending action:\n *\n * \t\tconst pendingActions = editor.plugins.get( 'PendingActions' );\n * \t\tconst action = pendingActions.add( 'Upload in progress: 0%.' );\n *\n *\t\t// You can update the message:\n * \t\taction.message = 'Upload in progress: 10%.';\n *\n * Removing a pending action:\n *\n * \t\tconst pendingActions = editor.plugins.get( 'PendingActions' );\n * \t\tconst action = pendingActions.add( 'Unsaved changes.' );\n *\n * \t\tpendingActions.remove( action );\n *\n * Getting pending actions:\n *\n * \t\tconst pendingActions = editor.plugins.get( 'PendingActions' );\n *\n * \t\tconst action1 = pendingActions.add( 'Action 1' );\n * \t\tconst action2 = pendingActions.add( 'Action 2' );\n *\n * \t\tpendingActions.first; // Returns action1\n * \t\tArray.from( pendingActions ); // Returns [ action1, action2 ]\n *\n * This plugin is used by features like {@link module:upload/filerepository~FileRepository} to register their ongoing actions\n * and by features like {@link module:autosave/autosave~Autosave} to detect whether there are any ongoing actions.\n * Read more about saving the data in the {@glink builds/guides/integration/saving-data Saving and getting data} guide.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class PendingActions extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'PendingActions';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\t/**\n\t\t * Defines whether there is any registered pending action.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} #hasAny\n\t\t */\n\t\tthis.set( 'hasAny', false );\n\n\t\t/**\n\t\t * A list of pending actions.\n\t\t *\n\t\t * @private\n\t\t * @type {module:utils/collection~Collection}\n\t\t */\n\t\tthis._actions = new Collection( { idProperty: '_id' } );\n\t\tthis._actions.delegate( 'add', 'remove' ).to( this );\n\t}\n\n\t/**\n\t * Adds an action to the list of pending actions.\n\t *\n\t * This method returns an action object with an observable message property.\n\t * The action object can be later used in the {@link #remove} method. It also allows you to change the message.\n\t *\n\t * @param {String} message The action message.\n\t * @returns {Object} An observable object that represents a pending action.\n\t */\n\tadd( message ) {\n\t\tif ( typeof message !== 'string' ) {\n\t\t\t/**\n\t\t\t * The message must be a string.\n\t\t\t *\n\t\t\t * @error pendingactions-add-invalid-message\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'pendingactions-add-invalid-message: The message must be a string.' );\n\t\t}\n\n\t\tconst action = Object.create( ObservableMixin );\n\n\t\taction.set( 'message', message );\n\t\tthis._actions.add( action );\n\t\tthis.hasAny = true;\n\n\t\treturn action;\n\t}\n\n\t/**\n\t * Removes an action from the list of pending actions.\n\t *\n\t * @param {Object} action An action object.\n\t */\n\tremove( action ) {\n\t\tthis._actions.remove( action );\n\t\tthis.hasAny = !!this._actions.length;\n\t}\n\n\t/**\n\t * Returns the first action from the list.\n\t *\n\t * returns {Object} The pending action object.\n\t */\n\tget first() {\n\t\treturn this._actions.get( 0 );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._actions[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Fired when an action is added to the list.\n\t *\n\t * @event add\n\t * @param {Object} action The added action.\n\t */\n\n\t/**\n\t * Fired when an action is removed from the list.\n\t *\n\t * @event remove\n\t * @param {Object} action The removed action.\n\t */\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module upload/filereader\n */\n\n/* globals window */\n\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\n\n/**\n * FileReader class - wrapper over native FileReader.\n */\nexport default class FileReader {\n\t/**\n\t * Creates an instance of the FileReader.\n\t */\n\tconstructor() {\n\t\tconst reader = new window.FileReader();\n\n\t\t/**\n\t\t * Instance of native FileReader.\n\t\t *\n\t\t * @private\n\t\t * @member {FileReader} #_reader\n\t\t */\n\t\tthis._reader = reader;\n\n\t\t/**\n\t\t * Number of bytes loaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #loaded\n\t\t */\n\t\tthis.set( 'loaded', 0 );\n\n\t\treader.onprogress = evt => {\n\t\t\tthis.loaded = evt.loaded;\n\t\t};\n\t}\n\n\t/**\n\t * Returns error that occurred during file reading.\n\t *\n\t * @returns {Error}\n\t */\n\tget error() {\n\t\treturn this._reader.error;\n\t}\n\n\t/**\n\t * Reads provided file.\n\t *\n\t * @param {File} file Native File object.\n\t * @returns {Promise} Returns a promise that will resolve with file's contents. Promise can be rejected in case of\n\t * error or when reading process is aborted.\n\t */\n\tread( file ) {\n\t\tconst reader = this._reader;\n\t\tthis.total = file.size;\n\n\t\treturn new Promise( ( resolve, reject ) => {\n\t\t\treader.onload = () => {\n\t\t\t\tresolve( reader.result );\n\t\t\t};\n\n\t\t\treader.onerror = () => {\n\t\t\t\treject( 'error' );\n\t\t\t};\n\n\t\t\treader.onabort = () => {\n\t\t\t\treject( 'aborted' );\n\t\t\t};\n\n\t\t\tthis._reader.readAsDataURL( file );\n\t\t} );\n\t}\n\n\t/**\n\t * Aborts file reader.\n\t */\n\tabort() {\n\t\tthis._reader.abort();\n\t}\n}\n\nmix( FileReader, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module upload/filerepository\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport PendingActions from '@ckeditor/ckeditor5-core/src/pendingactions';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport log from '@ckeditor/ckeditor5-utils/src/log';\nimport FileReader from './filereader.js';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid.js';\n/**\n * File repository plugin. A central point for managing file upload.\n *\n * To use it, first you need an upload adapter. Upload adapter's job is to handle communication with the server\n * (sending the file and handling server's response). You can use one of the existing plugins introducing upload adapters\n * (e.g. {@link module:easy-image/cloudservicesuploadadapter~CloudServicesUploadAdapter} or\n * {@link module:adapter-ckfinder/uploadadapter~CKFinderUploadAdapter}) or write your own one\n * (which boils down to setting the {@link ~FileRepository#createUploadAdapter} factory function – see\n * {@link module:upload/filerepository~UploadAdapter `UploadAdapter` interface} documentation).\n *\n * Then, you can use {@link module:upload/filerepository~FileRepository#createLoader `createLoader()`} and the returned\n * {@link module:upload/filerepository~FileLoader} instance to load and upload files.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class FileRepository extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    static get pluginName() {\n        return 'FileRepository';\n    }\n    /**\n\t * @inheritDoc\n\t */\n    static get requires() {\n        return [PendingActions];\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        /**\n\t\t * Collection of loaders associated with this repository.\n\t\t *\n\t\t * @member {module:utils/collection~Collection} #loaders\n\t\t */\n        this.loaders = new Collection();\n        // Keeps upload in a sync with pending actions.\n        this.loaders.on('add', () => this._updatePendingAction());\n        this.loaders.on('remove', () => this._updatePendingAction());\n        /**\n\t\t * Reference to a pending action registered in a {@link module:core/pendingactions~PendingActions} plugin\n\t\t * while upload is in progress. When there is no upload then value is `null`.\n\t\t *\n\t\t * @private\n\t\t * @member {Object} #_pendingAction\n\t\t */\n        this._pendingAction = null;\n        /**\n\t\t * A factory function which should be defined before using `FileRepository`.\n\t\t *\n\t\t * It should return a new instance of {@link module:upload/filerepository~UploadAdapter} that will be used to upload files.\n\t\t * {@link module:upload/filerepository~FileLoader} instance associated with the adapter\n\t\t * will be passed to that function.\n\t\t *\n\t\t * For more information and example see {@link module:upload/filerepository~UploadAdapter}.\n\t\t *\n\t\t * @member {Function} #createUploadAdapter\n\t\t */\n        /**\n\t\t * Number of bytes uploaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploaded\n\t\t */\n        this.set('uploaded', 0);\n        /**\n\t\t * Number of total bytes to upload.\n\t\t *\n\t\t * It might be different than the file size because of headers and additional data.\n\t\t * It contains `null` if value is not available yet, so it's better to use {@link #uploadedPercent} to monitor\n\t\t * the progress.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number|null} #uploadTotal\n\t\t */\n        this.set('uploadTotal', null);\n        /**\n\t\t * Upload progress in percents.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploadedPercent\n\t\t */\n        this.bind('uploadedPercent').to(this, 'uploaded', this, 'uploadTotal', (uploaded, total) => {\n            return total ? uploaded / total * 100 : 0;\n        });\n    }\n    /**\n\t * Returns the loader associated with specified file.\n\t *\n\t * To get loader by id use `fileRepository.loaders.get( id )`.\n\t *\n\t * @param {File} file Native file handle.\n\t * @returns {module:upload/filerepository~FileLoader|null}\n\t */\n    getLoader(file) {\n        for (const loader of this.loaders) {\n            if (loader.file == file) {\n                return loader;\n            }\n        }\n        return null;\n    }\n    /**\n\t * Creates a loader instance for the given file.\n\t *\n\t * Requires {@link #createUploadAdapter} factory to be defined.\n\t *\n\t * @param {File} file Native File object.\n\t * @returns {module:upload/filerepository~FileLoader|null}\n\t */\n    createLoader(file) {\n        if (!this.createUploadAdapter) {\n            /**\n\t\t\t * You need to enable an upload adapter in order to be able to upload files.\n\t\t\t *\n\t\t\t * This warning shows up when {@link module:upload/filerepository~FileRepository} is being used\n\t\t\t * without {@link #createUploadAdapter definining an upload adapter}.\n\t\t\t *\n\t\t\t * **If you see this warning when using one of the {@glink builds/index CKEditor 5 Builds}**\n\t\t\t * it means that you did not configure any of the upload adapters available by default in those builds.\n\t\t\t * See:\n\t\t\t *\n\t\t\t * * {@link module:core/editor/editorconfig~EditorConfig#cloudServices `config.cloudServices`} for\n\t\t\t * Easy Image with Cloud Services integration,\n\t\t\t * * {@link module:core/editor/editorconfig~EditorConfig#ckfinder `config.ckfinder`} for CKFinder\n\t\t\t * file upload integration.\n\t\t\t *\n\t\t\t * **If you see this warning when using a custom build** there is a chance that you enabled\n\t\t\t * a feature like {@link module:image/imageupload~ImageUpload},\n\t\t\t * or {@link module:image/imageupload/imageuploadui~ImageUploadUI} but you did not enable any upload adapter.\n\t\t\t * You can choose one of the existing upload adapters:\n\t\t\t *\n\t\t\t * * {@link module:easy-image/cloudservicesuploadadapter~CloudServicesUploadAdapter}\n\t\t\t * (remember to {@link module:core/editor/editorconfig~EditorConfig#cloudServices configure it})\n\t\t\t * * {@link module:adapter-ckfinder/uploadadapter~CKFinderUploadAdapter}\n\t\t\t * (remember to {@link module:core/editor/editorconfig~EditorConfig#ckfinder configure it})\n\t\t\t *\n\t\t\t * You can also implement your own upload adapter (in which case, please refer\n\t\t\t * to the {@link module:upload/filerepository~UploadAdapter `UploadAdapter` interface} documentation).\n\t\t\t *\n\t\t\t * @error filerepository-no-upload-adapter\n\t\t\t */\n            log.error('filerepository-no-upload-adapter: Upload adapter is not defined.');\n            return null;\n        }\n        const loader = new FileLoader(file);\n        loader._adapter = this.createUploadAdapter(loader);\n        this.loaders.add(loader);\n        loader.on('change:uploaded', () => {\n            let aggregatedUploaded = 0;\n            for (const loader of this.loaders) {\n                aggregatedUploaded += loader.uploaded;\n            }\n            this.uploaded = aggregatedUploaded;\n        });\n        loader.on('change:uploadTotal', () => {\n            let aggregatedTotal = 0;\n            for (const loader of this.loaders) {\n                if (loader.uploadTotal) {\n                    aggregatedTotal += loader.uploadTotal;\n                }\n            }\n            this.uploadTotal = aggregatedTotal;\n        });\n        return loader;\n    }\n    /**\n\t * Destroys the given loader.\n\t *\n\t * @param {File|module:upload/filerepository~FileLoader} fileOrLoader File associated with that loader or loader\n\t * itself.\n\t */\n    destroyLoader(fileOrLoader) {\n        const loader = fileOrLoader instanceof FileLoader ? fileOrLoader : this.getLoader(fileOrLoader);\n        loader._destroy();\n        this.loaders.remove(loader);\n    }\n    /**\n\t * Registers or deregisters pending action bound with upload progress.\n\t *\n\t * @private\n\t */\n    _updatePendingAction() {\n        const pendingActions = this.editor.plugins.get(PendingActions);\n        if (this.loaders.length) {\n            if (!this._pendingAction) {\n                const t = this.editor.t;\n                const getMessage = value => `${ t('b') } ${ parseInt(value) }%.`;\n                this._pendingAction = pendingActions.add(getMessage(this.uploadedPercent));\n                this._pendingAction.bind('message').to(this, 'uploadedPercent', getMessage);\n            }\n        } else {\n            pendingActions.remove(this._pendingAction);\n            this._pendingAction = null;\n        }\n    }\n}\nmix(FileRepository, ObservableMixin);\n/**\n * File loader class.\n * It is used to control the process of file reading and uploading using specified adapter.\n */\nclass FileLoader {\n    /**\n\t * Creates a new instance of `FileLoader`.\n\t *\n\t * @param {File} file A native file instance.\n\t * @param {module:upload/filerepository~UploadAdapter} adapter\n\t */\n    constructor(file, adapter) {\n        /**\n\t\t * Unique id of FileLoader instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n        this.id = uid();\n        /**\n\t\t * A `File` instance associated with this file loader.\n\t\t *\n\t\t * @readonly\n\t\t * @member {File}\n\t\t */\n        this.file = file;\n        /**\n\t\t * Adapter instance associated with this file loader.\n\t\t *\n\t\t * @private\n\t\t * @member {module:upload/filerepository~UploadAdapter}\n\t\t */\n        this._adapter = adapter;\n        /**\n\t\t * FileReader used by FileLoader.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:upload/filereader~FileReader}\n\t\t */\n        this._reader = new FileReader();\n        /**\n\t\t * Current status of FileLoader. It can be one of the following:\n\t\t *\n\t\t * * 'idle',\n\t\t * * 'reading',\n\t\t * * 'uploading',\n\t\t * * 'aborted',\n\t\t * * 'error'.\n\t\t *\n\t\t * When reading status can change in a following way:\n\t\t *\n\t\t * `idle` -> `reading` -> `idle`\n\t\t * `idle` -> `reading -> `aborted`\n\t\t * `idle` -> `reading -> `error`\n\t\t *\n\t\t * When uploading status can change in a following way:\n\t\t *\n\t\t * `idle` -> `uploading` -> `idle`\n\t\t * `idle` -> `uploading` -> `aborted`\n\t\t * `idle` -> `uploading` -> `error`\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {String} #status\n\t\t */\n        this.set('status', 'idle');\n        /**\n\t\t * Number of bytes uploaded.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploaded\n\t\t */\n        this.set('uploaded', 0);\n        /**\n\t\t * Number of total bytes to upload.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number|null} #uploadTotal\n\t\t */\n        this.set('uploadTotal', null);\n        /**\n\t\t * Upload progress in percents.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Number} #uploadedPercent\n\t\t */\n        this.bind('uploadedPercent').to(this, 'uploaded', this, 'uploadTotal', (uploaded, total) => {\n            return total ? uploaded / total * 100 : 0;\n        });\n        /**\n\t\t * Response of the upload.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Object|null} #uploadResponse\n\t\t */\n        this.set('uploadResponse', null);\n    }\n    /**\n\t * Reads file using {@link module:upload/filereader~FileReader}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `filerepository-read-wrong-status` when status\n\t * is different than `idle`.\n\t *\n\t * Example usage:\n\t *\n\t *\tfileLoader.read()\n\t *\t\t.then( data => { ... } )\n\t *\t\t.catch( err => {\n\t *\t\t\tif ( err === 'aborted' ) {\n\t *\t\t\t\tconsole.log( 'Reading aborted.' );\n\t *\t\t\t} else {\n\t *\t\t\t\tconsole.log( 'Reading error.', err );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @returns {Promise} Returns promise that will be resolved with read data. Promise will be rejected if error\n\t * occurs or if read process is aborted.\n\t */\n    read() {\n        if (this.status != 'idle') {\n            throw new CKEditorError('filerepository-read-wrong-status: You cannot call read if the status is different than idle.');\n        }\n        this.status = 'reading';\n        return this._reader.read(this.file).then(data => {\n            this.status = 'idle';\n            return data;\n        }).catch(err => {\n            if (err === 'aborted') {\n                this.status = 'aborted';\n                throw 'aborted';\n            }\n            this.status = 'error';\n            throw this._reader.error;\n        });\n    }\n    /**\n\t * Reads file using the provided {@link module:upload/filerepository~UploadAdapter}.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `filerepository-upload-wrong-status` when status\n\t * is different than `idle`.\n\t * Example usage:\n\t *\n\t *\tfileLoader.upload()\n\t *\t\t.then( data => { ... } )\n\t *\t\t.catch( e => {\n\t *\t\t\tif ( e === 'aborted' ) {\n\t *\t\t\t\tconsole.log( 'Uploading aborted.' );\n\t *\t\t\t} else {\n\t *\t\t\t\tconsole.log( 'Uploading error.', e );\n\t *\t\t\t}\n\t *\t\t} );\n\t *\n\t * @returns {Promise} Returns promise that will be resolved with response data. Promise will be rejected if error\n\t * occurs or if read process is aborted.\n\t */\n    upload() {\n        if (this.status != 'idle') {\n            throw new CKEditorError('filerepository-upload-wrong-status: You cannot call upload if the status is different than idle.');\n        }\n        this.status = 'uploading';\n        return this._adapter.upload().then(data => {\n            this.uploadResponse = data;\n            this.status = 'idle';\n            return data;\n        }).catch(err => {\n            if (this.status === 'aborted') {\n                throw 'aborted';\n            }\n            this.status = 'error';\n            throw err;\n        });\n    }\n    /**\n\t * Aborts loading process.\n\t */\n    abort() {\n        const status = this.status;\n        this.status = 'aborted';\n        if (status == 'reading') {\n            this._reader.abort();\n        }\n        if (status == 'uploading' && this._adapter.abort) {\n            this._adapter.abort();\n        }\n        this._destroy();\n    }\n    /**\n\t * Performs cleanup.\n\t *\n\t * @private\n\t */\n    _destroy() {\n        this._reader = undefined;\n        this._adapter = undefined;\n        this.data = undefined;\n        this.uploadResponse = undefined;\n        this.file = undefined;\n    }\n}\nmix(FileLoader, ObservableMixin);    /**\n * Upload adapter interface used by FileRepository to handle file upload. Upload adapter is a bridge between the editor and server that\n * handles file uploads. It should contain logic necessary to initiate upload process and monitor its progress.\n *\n * It should implement two methods:\n *\n * * {@link module:upload/filerepository~UploadAdapter#upload `upload()`},\n * * {@link module:upload/filerepository~UploadAdapter#abort `abort()`}.\n *\n * Example upload adapter implementation:\n *\n *\t\tclass UploadAdapter {\n *\t\t\tconstructor( loader ) {\n *\t\t\t\t// Save Loader instance to update upload progress.\n *\t\t\t\tthis.loader = loader;\n *\t\t\t}\n *\n *\t\t\tupload() {\n *\t\t\t\t// Update loader's progress.\n *\t\t\t\tserver.onUploadProgress( data => {\n *\t\t\t\t\tloader.uploadTotal = data.total;\n *\t\t\t\t\tloader.uploaded = data.uploaded;\n *\t\t\t\t} ):\n *\n *\t\t\t\t// Return promise that will be resolved when file is uploaded.\n *\t\t\t\treturn server.upload( loader.file );\n *\t\t\t}\n *\n *\t\t\tabort() {\n *\t\t\t\t// Reject promise returned from upload() method.\n *\t\t\t\tserver.abortUpload();\n *\t\t\t}\n *\t\t}\n *\n * Then upload adapter can be set to be used by {@link module:upload/filerepository~FileRepository FileRepository}:\n *\n *\t\teditor.plugins.get( 'FileRepository' ).createUploadAdapter = function( loader ) {\n *\t\t\treturn new UploadAdapter( loader );\n *\t\t};\n *\n * @interface UploadAdapter\n */\n                                     /**\n * Executes the upload process.\n * This method should return a promise that will resolve when data will be uploaded to server. Promise should be\n * resolved with an object containing information about uploaded file:\n *\n *\t\t{\n *\t\t\tdefault: 'http://server/default-size.image.png'\n *\t\t}\n *\n * Additionally, other image sizes can be provided:\n *\n *\t\t{\n *\t\t\tdefault: 'http://server/default-size.image.png',\n *\t\t\t'160': 'http://server/size-160.image.png',\n *\t\t\t'500': 'http://server/size-500.image.png',\n *\t\t\t'1000': 'http://server/size-1000.image.png',\n *\t\t\t'1052': 'http://server/default-size.image.png'\n *\t\t}\n *\n * NOTE: When returning multiple images, the widest returned one should equal the default one. It is essential to\n * correctly set `width` attribute of the image. See this discussion:\n * https://github.com/ckeditor/ckeditor5-easy-image/issues/4 for more information.\n *\n * Take a look at {@link module:upload/filerepository~UploadAdapter example Adapter implementation} and\n * {@link module:upload/filerepository~FileRepository#createUploadAdapter createUploadAdapter method}.\n *\n * @method module:upload/filerepository~UploadAdapter#upload\n * @returns {Promise} Promise that should be resolved when data is uploaded.\n */\n                                     /**\n * Aborts the upload process.\n * After aborting it should reject promise returned from {@link #upload upload()}.\n *\n * Take a look at {@link module:upload/filerepository~UploadAdapter example Adapter implementation} and\n * {@link module:upload/filerepository~FileRepository#createUploadAdapter createUploadAdapter method}.\n *\n * @method module:upload/filerepository~UploadAdapter#abort\n */","export default class OpUploadResourceAdapter {\n    constructor(loader, resource, editor) {\n        this.loader = loader;\n        this.resource = resource;\n        this.editor = editor;\n    }\n\n    upload() {\n\t\tconst resource = this.resource;\n        if (!(resource && resource.uploadAttachments)) {\n\t\t\tconst resourceContext = resource ? resource.name : 'Missing context';\n            console.warn(`uploadAttachments not present on context: ${resourceContext}`);\n            return Promise.reject(\"You're not allowed to upload attachments on this resource.\");\n        }\n\n\t\treturn resource\n\t\t\t.uploadAttachments([this.loader.file])\n\t\t\t.then((result) => {\n\t\t\t\tthis.editor.model.fire('op:attachment-added', result);\n\n\t\t\t\treturn this.buildResponse(result[0])\n\t\t\t});\n\t}\n\n\tbuildResponse(result) {\n\t\treturn { default: result.uploadUrl };\n\t}\n\n    abort() {\n\t\treturn false;\n    }\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module upload/ui/filedialogbuttonview\n */\n\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport View from '@ckeditor/ckeditor5-ui/src/view';\n\n/**\n * The file dialog button view.\n *\n * This component provides a button that opens the native file selection dialog.\n * It can be used to implement the UI of a file upload feature.\n *\n *\t\tconst view = new FileDialogButtonView( locale );\n *\n *\t\tview.set( {\n *\t\t\tacceptedType: 'image/*',\n *\t\t\tallowMultipleFiles: true\n *\t\t} );\n *\n *\t\tview.buttonView.set( {\n *\t\t\tlabel: t( 'Insert image' ),\n *\t\t\ticon: imageIcon,\n *\t\t\ttooltip: true\n *\t\t} );\n *\n *\t\tview.on( 'done', ( evt, files ) => {\n *\t\t\tfor ( const file of Array.from( files ) ) {\n *\t\t\t\tconsole.log( 'Selected file', file );\n *\t\t\t}\n *\t\t} );\n *\n * @extends module:ui/view~View\n */\nexport default class FileDialogButtonView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The button view of the component.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n\t\tthis.buttonView = new ButtonView( locale );\n\n\t\t/**\n\t\t * A hidden `<input>` view used to execute file dialog.\n\t\t *\n\t\t * @protected\n\t\t * @member {module:upload/ui/filedialogbuttonview~FileInputView}\n\t\t */\n\t\tthis._fileInputView = new FileInputView( locale );\n\n\t\t/**\n\t\t * Accepted file types. Can be provided in form of file extensions, media type or one of:\n\t\t * * `audio/*`,\n\t\t * * `video/*`,\n\t\t * * `image/*`.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #acceptedType\n\t\t */\n\t\tthis._fileInputView.bind( 'acceptedType' ).to( this );\n\n\t\t/**\n\t\t * Indicates if multiple files can be selected. Defaults to `true`.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #allowMultipleFiles\n\t\t */\n\t\tthis._fileInputView.bind( 'allowMultipleFiles' ).to( this );\n\n\t\t/**\n\t\t * Fired when file dialog is closed with file selected.\n\t\t *\n\t\t *\t\tview.on( 'done', ( evt, files ) => {\n\t\t *\t\t\tfor ( const file of files ) {\n\t\t *\t\t\t\tconsole.log( 'Selected file', file );\n\t\t *\t\t\t}\n\t\t *\t\t}\n\t\t *\n\t\t * @event done\n\t\t * @param {Array.<File>} files Array of selected files.\n\t\t */\n\t\tthis._fileInputView.delegate( 'done' ).to( this );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'span',\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-file-dialog-button',\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\tthis.buttonView,\n\t\t\t\tthis._fileInputView\n\t\t\t]\n\t\t} );\n\n\t\tthis.buttonView.on( 'execute', () => {\n\t\t\tthis._fileInputView.open();\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the {@link #buttonView}.\n\t */\n\tfocus() {\n\t\tthis.buttonView.focus();\n\t}\n}\n\n/**\n * The hidden file input view class.\n *\n * @private\n * @extends {module:ui/view~View}\n */\nclass FileInputView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Accepted file types. Can be provided in form of file extensions, media type or one of:\n\t\t * * `audio/*`,\n\t\t * * `video/*`,\n\t\t * * `image/*`.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #acceptedType\n\t\t */\n\t\tthis.set( 'acceptedType' );\n\n\t\t/**\n\t\t * Indicates if multiple files can be selected. Defaults to `false`.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #allowMultipleFiles\n\t\t */\n\t\tthis.set( 'allowMultipleFiles', false );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'input',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-hidden'\n\t\t\t\t],\n\t\t\t\ttype: 'file',\n\t\t\t\ttabindex: '-1',\n\t\t\t\taccept: bind.to( 'acceptedType' ),\n\t\t\t\tmultiple: bind.to( 'allowMultipleFiles' )\n\t\t\t},\n\n\t\t\ton: {\n\t\t\t\t// Removing from code coverage since we cannot programmatically set input element files.\n\t\t\t\tchange: bind.to( /* istanbul ignore next */ () => {\n\t\t\t\t\tif ( this.element && this.element.files && this.element.files.length ) {\n\t\t\t\t\t\tthis.fire( 'done', this.element.files );\n\t\t\t\t\t}\n\n\t\t\t\t\tthis.element.value = '';\n\t\t\t\t} )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Opens file dialog.\n\t */\n\topen() {\n\t\tthis.element.click();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module upload/utils\n */\n\nimport ModelPosition from '@ckeditor/ckeditor5-engine/src/model/position';\n\n/**\n * Checks if a given file is an image.\n *\n * @param {File} file\n * @returns {Boolean}\n */\nexport function isImageType( file ) {\n\tconst types = /^image\\/(jpeg|png|gif|bmp)$/;\n\n\treturn types.test( file.type );\n}\n\n/**\n * Returns a model position which is optimal (in terms of UX) for inserting an image.\n *\n * For instance, if a selection is in the middle of a paragraph, the position before this paragraph\n * will be returned so that it is not split. If the selection is at the end of a paragraph,\n * the position after this paragraph will be returned.\n *\n * Note: If the selection is placed in an empty block, that block will be returned. If that position\n * is then passed to {@link module:engine/model/model~Model#insertContent},\n * the block will be fully replaced by the image.\n *\n * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n * The selection based on which the insertion position should be calculated.\n * @returns {module:engine/model/position~Position} The optimal position.\n */\nexport function findOptimalInsertionPosition( selection ) {\n\tconst selectedElement = selection.getSelectedElement();\n\n\tif ( selectedElement ) {\n\t\treturn ModelPosition.createAfter( selectedElement );\n\t}\n\n\tconst firstBlock = selection.getSelectedBlocks().next().value;\n\n\tif ( firstBlock ) {\n\t\t// If inserting into an empty block – return position in that block. It will get\n\t\t// replaced with the image by insertContent(). #42.\n\t\tif ( firstBlock.isEmpty ) {\n\t\t\treturn ModelPosition.createAt( firstBlock );\n\t\t}\n\n\t\tconst positionAfter = ModelPosition.createAfter( firstBlock );\n\n\t\t// If selection is at the end of the block - return position after the block.\n\t\tif ( selection.focus.isTouching( positionAfter ) ) {\n\t\t\treturn positionAfter;\n\t\t}\n\n\t\t// Otherwise return position before the block.\n\t\treturn ModelPosition.createBefore( firstBlock );\n\t}\n\n\treturn selection.focus;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imageupload/imageuploadui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileDialogButtonView from '@ckeditor/ckeditor5-upload/src/ui/filedialogbuttonview';\nimport imageIcon from '@ckeditor/ckeditor5-core/theme/icons/image.svg';\nimport {\n    isImageType,\n    findOptimalInsertionPosition\n} from './utils';\n/**\n * The image upload button plugin.\n * Adds the `imageUpload` button to the {@link module:ui/componentfactory~ComponentFactory UI component factory}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageUploadUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        // Setup `imageUpload` button.\n        editor.ui.componentFactory.add('imageUpload', locale => {\n            const view = new FileDialogButtonView(locale);\n            const command = editor.commands.get('imageUpload');\n            view.set({\n                acceptedType: 'image/*',\n                allowMultipleFiles: true\n            });\n            view.buttonView.set({\n                label: t('at'),\n                icon: imageIcon,\n                tooltip: true\n            });\n            view.buttonView.bind('isEnabled').to(command);\n            view.on('done', (evt, files) => {\n                for (const file of Array.from(files)) {\n                    const insertAt = findOptimalInsertionPosition(editor.model.document.selection);\n                    if (isImageType(file)) {\n                        editor.execute('imageUpload', {\n                            file,\n                            insertAt\n                        });\n                    }\n                }\n            });\n            return view;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imageupload/imageuploadprogress\n */\n\n/* globals setTimeout */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';\nimport uploadingPlaceholder from '../../theme/icons/image_placeholder.svg';\nimport UIElement from '@ckeditor/ckeditor5-engine/src/view/uielement';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport ViewRange from '@ckeditor/ckeditor5-engine/src/view/range';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\nimport '../../theme/imageuploadprogress.css';\nimport '../../theme/imageuploadicon.css';\nimport '../../theme/imageuploadloader.css';\n\n/**\n * The image upload progress plugin.\n * It shows a placeholder when the image is read from the disk and a progress bar while the image is uploading.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageUploadProgress extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The image placeholder that is displayed before real image data can be accessed.\n\t\t *\n\t\t * @protected\n\t\t * @member {String} #placeholder\n\t\t */\n\t\tthis.placeholder = 'data:image/svg+xml;utf8,' + encodeURIComponent( uploadingPlaceholder );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Upload status change - update image's view according to that status.\n\t\teditor.editing.downcastDispatcher.on( 'attribute:uploadStatus:image', ( ...args ) => this.uploadStatusChange( ...args ) );\n\t}\n\n\t/**\n\t * This method is called each time the image `uploadStatus` attribute is changed.\n\t *\n\t * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n\t * @param {Object} data Additional information about the change.\n\t * @param {module:engine/conversion/modelconsumable~ModelConsumable} consumable Values to consume.\n\t * @param {Object} conversionApi\n\t */\n\tuploadStatusChange( evt, data, conversionApi ) {\n\t\tconst editor = this.editor;\n\t\tconst modelImage = data.item;\n\t\tconst uploadId = modelImage.getAttribute( 'uploadId' );\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst fileRepository = editor.plugins.get( FileRepository );\n\t\tconst status = uploadId ? data.attributeNewValue : null;\n\t\tconst placeholder = this.placeholder;\n\t\tconst viewFigure = editor.editing.mapper.toViewElement( modelImage );\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\tif ( status == 'reading' ) {\n\t\t\t// Start \"appearing\" effect and show placeholder with infinite progress bar on the top\n\t\t\t// while image is read from disk.\n\t\t\t_startAppearEffect( viewFigure, viewWriter );\n\t\t\t_showPlaceholder( placeholder, viewFigure, viewWriter );\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Show progress bar on the top of the image when image is uploading.\n\t\tif ( status == 'uploading' ) {\n\t\t\tconst loader = fileRepository.loaders.get( uploadId );\n\n\t\t\t// Start appear effect if needed - see https://github.com/ckeditor/ckeditor5-image/issues/191.\n\t\t\t_startAppearEffect( viewFigure, viewWriter );\n\n\t\t\tif ( !loader ) {\n\t\t\t\t// There is no loader associated with uploadId - this means that image came from external changes.\n\t\t\t\t// In such cases we still want to show the placeholder until image is fully uploaded.\n\t\t\t\t// Show placeholder if needed - see https://github.com/ckeditor/ckeditor5-image/issues/191.\n\t\t\t\t_showPlaceholder( placeholder, viewFigure, viewWriter );\n\t\t\t} else {\n\t\t\t\t// Hide placeholder and initialize progress bar showing upload progress.\n\t\t\t\t_hidePlaceholder( viewFigure, viewWriter );\n\t\t\t\t_showProgressBar( viewFigure, viewWriter, loader, editor.editing.view );\n\t\t\t}\n\n\t\t\treturn;\n\t\t}\n\n\t\t// Because in Edge there is no way to show fancy animation of completeIcon we need to skip it.\n\t\tif ( status == 'complete' && fileRepository.loaders.get( uploadId ) && !env.isEdge ) {\n\t\t\t_showCompleteIcon( viewFigure, viewWriter, editor.editing.view );\n\t\t}\n\n\t\t// Clean up.\n\t\t_hideProgressBar( viewFigure, viewWriter );\n\t\t_hidePlaceholder( viewFigure, viewWriter );\n\t\t_stopAppearEffect( viewFigure, viewWriter );\n\t}\n}\n\n// Symbol added to progress bar UIElement to distinguish it from other elements.\nconst progressBarSymbol = Symbol( 'progress-bar' );\n\n// Symbol added to placeholder UIElement to distinguish it from other elements.\nconst placeholderSymbol = Symbol( 'placeholder' );\n\n// Adds ck-appear class to the image figure if one is not already applied.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\nfunction _startAppearEffect( viewFigure, writer ) {\n\tif ( !viewFigure.hasClass( 'ck-appear' ) ) {\n\t\twriter.addClass( 'ck-appear', viewFigure );\n\t}\n}\n\n// Removes ck-appear class to the image figure if one is not already removed.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\nfunction _stopAppearEffect( viewFigure, writer ) {\n\twriter.removeClass( 'ck-appear', viewFigure );\n}\n\n// Shows placeholder together with infinite progress bar on given image figure.\n//\n// @param {String} Data-uri with a svg placeholder.\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\nfunction _showPlaceholder( placeholder, viewFigure, writer ) {\n\tif ( !viewFigure.hasClass( 'ck-image-upload-placeholder' ) ) {\n\t\twriter.addClass( 'ck-image-upload-placeholder', viewFigure );\n\t}\n\n\tconst viewImg = viewFigure.getChild( 0 );\n\n\tif ( viewImg.getAttribute( 'src' ) !== placeholder ) {\n\t\twriter.setAttribute( 'src', placeholder, viewImg );\n\t}\n\n\tif ( !_getUIElement( viewFigure, placeholderSymbol ) ) {\n\t\twriter.insert( ViewPosition.createAfter( viewImg ), _createPlaceholder( writer ) );\n\t}\n}\n\n// Removes placeholder together with infinite progress bar on given image figure.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\nfunction _hidePlaceholder( viewFigure, writer ) {\n\tif ( viewFigure.hasClass( 'ck-image-upload-placeholder' ) ) {\n\t\twriter.removeClass( 'ck-image-upload-placeholder', viewFigure );\n\t}\n\n\t_removeUIElement( viewFigure, writer, placeholderSymbol );\n}\n\n// Shows progress bar displaying upload progress.\n// Attaches it to the file loader to update when upload percentace is changed.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\n// @param {module:upload/filerepository~FileLoader} loader\n// @param {module:engine/view/view~View} view\nfunction _showProgressBar( viewFigure, writer, loader, view ) {\n\tconst progressBar = _createProgressBar( writer );\n\twriter.insert( ViewPosition.createAt( viewFigure, 'end' ), progressBar );\n\n\t// Update progress bar width when uploadedPercent is changed.\n\tloader.on( 'change:uploadedPercent', ( evt, name, value ) => {\n\t\tview.change( writer => {\n\t\t\twriter.setStyle( 'width', value + '%', progressBar );\n\t\t} );\n\t} );\n}\n\n// Hides upload progress bar.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\nfunction _hideProgressBar( viewFigure, writer ) {\n\t_removeUIElement( viewFigure, writer, progressBarSymbol );\n}\n\n// Shows complete icon and hides after a certain amount of time.\n//\n// @param {module:engine/view/containerelement~ContainerElement} viewFigure\n// @param {module:engine/view/writer~Writer} writer\n// @param {module:engine/view/view~View} view\nfunction _showCompleteIcon( viewFigure, writer, view ) {\n\tconst completeIcon = new UIElement( 'div', { class: 'ck-image-upload-complete-icon' } );\n\n\twriter.insert( ViewPosition.createAt( viewFigure, 'end' ), completeIcon );\n\n\tsetTimeout( () => {\n\t\tview.change( writer => writer.remove( ViewRange.createOn( completeIcon ) ) );\n\t}, 3000 );\n}\n\n// Create progress bar element using {@link module:engine/view/uielement~UIElement}.\n//\n// @private\n// @param {module:engine/view/writer~Writer} writer\n// @returns {module:engine/view/uielement~UIElement}\nfunction _createProgressBar( writer ) {\n\tconst progressBar = writer.createUIElement( 'div', { class: 'ck-progress-bar' } );\n\n\twriter.setCustomProperty( progressBarSymbol, true, progressBar );\n\n\treturn progressBar;\n}\n\n// Create placeholder element using {@link module:engine/view/uielement~UIElement}.\n//\n// @private\n// @param {module:engine/view/writer~Writer} writer\n// @returns {module:engine/view/uielement~UIElement}\nfunction _createPlaceholder( writer ) {\n\tconst placeholder = writer.createUIElement( 'div', { class: 'ck-upload-placeholder-loader' } );\n\n\twriter.setCustomProperty( placeholderSymbol, true, placeholder );\n\n\treturn placeholder;\n}\n\n// Returns {@link module:engine/view/uielement~UIElement} of given unique property from image figure element.\n// Returns `undefined` if element is not found.\n//\n// @private\n// @param {module:engine/view/element~Element} imageFigure\n// @param {Symbol} uniqueProperty\n// @returns {module:engine/view/uielement~UIElement|undefined}\nfunction _getUIElement( imageFigure, uniqueProperty ) {\n\tfor ( const child of imageFigure.getChildren() ) {\n\t\tif ( child.getCustomProperty( uniqueProperty ) ) {\n\t\t\treturn child;\n\t\t}\n\t}\n}\n\n// Removes {@link module:engine/view/uielement~UIElement} of given unique property from image figure element.\n//\n// @private\n// @param {module:engine/view/element~Element} imageFigure\n// @param {module:engine/view/writer~Writer} writer\n// @param {Symbol} uniqueProperty\nfunction _removeUIElement( viewFigure, writer, uniqueProperty ) {\n\tconst element = _getUIElement( viewFigure, uniqueProperty );\n\n\tif ( element ) {\n\t\twriter.remove( ViewRange.createOn( element ) );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ModelSelection from '@ckeditor/ckeditor5-engine/src/model/selection';\nimport FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * @module image/imageupload/imageuploadcommand\n */\n\n/**\n * Image upload command.\n *\n * @extends module:core/command~Command\n */\nexport default class ImageUploadCommand extends Command {\n\t/**\n\t * Executes the command.\n\t *\n\t * @fires execute\n\t * @param {Object} options Options for the executed command.\n\t * @param {File} options.file The image file to upload.\n\t * @param {module:engine/model/position~Position} [options.insertAt] The position at which the image should be inserted.\n\t * If the position is not specified, the image will be inserted into the current selection.\n\t * Note: You can use the {@link module:upload/utils~findOptimalInsertionPosition} function to calculate\n\t * (e.g. based on the current selection) a position which is more optimal from the UX perspective.\n\t */\n\texecute( options ) {\n\t\tconst editor = this.editor;\n\t\tconst doc = editor.model.document;\n\t\tconst file = options.file;\n\t\tconst fileRepository = editor.plugins.get( FileRepository );\n\n\t\teditor.model.change( writer => {\n\t\t\tconst loader = fileRepository.createLoader( file );\n\n\t\t\t// Do not throw when upload adapter is not set. FileRepository will log an error anyway.\n\t\t\tif ( !loader ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst imageElement = writer.createElement( 'image', {\n\t\t\t\tuploadId: loader.id\n\t\t\t} );\n\n\t\t\tlet insertAtSelection;\n\n\t\t\tif ( options.insertAt ) {\n\t\t\t\tinsertAtSelection = new ModelSelection( [ new ModelRange( options.insertAt ) ] );\n\t\t\t} else {\n\t\t\t\tinsertAtSelection = doc.selection;\n\t\t\t}\n\n\t\t\teditor.model.insertContent( imageElement, insertAtSelection );\n\n\t\t\t// Inserting an image might've failed due to schema regulations.\n\t\t\tif ( imageElement.parent ) {\n\t\t\t\twriter.setSelection( imageElement, 'on' );\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/notification/notification\n */\n\n/* globals window */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * The Notification plugin.\n *\n * This plugin sends few base types of notifications: `success`, `info` and `warning`. This notifications need to be\n * handled and displayed by plugin responsible for showing UI of the notifications. Using this plugin for dispatching\n * notifications makes possible to switch the notifications UI.\n *\n * Note that every unhandled and not stopped `warning` notification will be displayed as system alert.\n * See {@link module:ui/notification/notification~Notification#showWarning}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Notification extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Notification';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\t// Each unhandled and not stopped `show:warning` event is displayed as system alert.\n\t\tthis.on( 'show:warning', ( evt, data ) => {\n\t\t\twindow.alert( data.message ); // eslint-disable-line no-alert\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * Shows success notification.\n\t *\n\t * At default it fires `show:success` event with given data but event namespace can be extended\n\t * by `data.namespace` option e.g.\n\t *\n\t * \t\tshowSuccess( 'Image is uploaded.', {\n\t * \t\t\tnamespace: 'upload:image'\n\t * \t\t} );\n\t *\n\t * will fire `show:success:upload:image` event.\n\t * Title of the notification can be provided:\n\t *\n\t *\t\tshowSuccess( 'Image is uploaded.', {\n\t *\t\t\ttitle: 'Image upload success'\n\t *\t\t});\n\t *\n\t * @param {String} message Content of the notification.\n\t * @param {Object} [data={}] Additional data.\n\t * @param {String} [data.namespace] Additional event namespace.\n\t * @param {String} [data.title] Title of the notification.\n\t */\n\tshowSuccess( message, data = {} ) {\n\t\tthis._showNotification( {\n\t\t\tmessage,\n\t\t\ttype: 'success',\n\t\t\tnamespace: data.namespace,\n\t\t\ttitle: data.title\n\t\t} );\n\t}\n\n\t/**\n\t * Shows info notification.\n\t *\n\t * At default it fires `show:info` event with given data but event namespace can be extended\n\t * by `data.namespace` option e.g.\n\t *\n\t * \t\tshowInfo( 'Editor is offline.', {\n\t * \t\t\tnamespace: 'editor:status'\n\t * \t\t} );\n\t *\n\t * will fire `show:info:editor:status` event.\n\t * Title of the notification can be provided:\n\t *\n\t *\t\tshowInfo( 'Editor is offline.', {\n\t *\t\t\ttitle: 'Network information'\n\t *\t\t});\n\t *\n\t * @param {String} message Content of the notification.\n\t * @param {Object} [data={}] Additional data.\n\t * @param {String} [data.namespace] Additional event namespace.\n\t * @param {String} [data.title] Title of the notification.\n\t */\n\tshowInfo( message, data = {} ) {\n\t\tthis._showNotification( {\n\t\t\tmessage,\n\t\t\ttype: 'info',\n\t\t\tnamespace: data.namespace,\n\t\t\ttitle: data.title\n\t\t} );\n\t}\n\n\t/**\n\t * Shows warning notification.\n\t *\n\t * At default it fires `show:warning` event with given data but event namespace can be extended\n\t * by `data.namespace` option e.g.\n\t *\n\t * \t\tshowWarning( 'Image upload error.', {\n\t * \t\t\tnamespace: 'upload:image'\n\t * \t\t} );\n\t *\n\t * will fire `show:warning:upload:image` event.\n\t * Title of the notification can be provided:\n\t *\n\t *\t\tshowWarning( 'Image upload error.', {\n\t *\t\t\ttitle: 'Upload failed'\n\t *\t\t});\n\t *\n\t * Note that each unhandled and not stopped `warning` notification will be displayed as system alert.\n\t * Plugin responsible for displaying warnings should `stop()` the event to prevent of displaying it as alert:\n\t *\n\t * \t\tnotifications.on( 'show:warning', ( evt, data ) => {\n\t * \t\t\t// Do something with data.\n\t *\n\t * \t\t\t// Stop this event to prevent of displaying as alert.\n\t * \t\t\tevt.stop();\n\t * \t\t} );\n\t *\n\t * You can attach many listeners to the same event and `stop()` this event in the listener with the low priority:\n\t *\n\t * \t\tnotifications.on( 'show:warning', ( evt, data ) => {\n\t * \t\t\t// Show warning in the UI, but not stop it.\n\t * \t\t} );\n\t *\n\t * \t\tnotifications.on( 'show:warning', ( evt, data ) => {\n\t * \t\t\t// Log warning to some error tracker.\n\t *\n\t * \t\t\t// Stop this event to prevent of displaying as alert.\n\t * \t\t\tevt.stop();\n\t * \t\t}, { priority: 'low' } );\n\t *\n\t * @param {String} message Content of the notification.\n\t * @param {Object} [data={}] Additional data.\n\t * @param {String} [data.namespace] Additional event namespace.\n\t * @param {String} [data.title] Title of the notification.\n\t */\n\tshowWarning( message, data = {} ) {\n\t\tthis._showNotification( {\n\t\t\tmessage,\n\t\t\ttype: 'warning',\n\t\t\tnamespace: data.namespace,\n\t\t\ttitle: data.title\n\t\t} );\n\t}\n\n\t/**\n\t * Fires `show` event with specified type, namespace and message.\n\t *\n\t * @private\n\t * @param {Object} data Message data.\n\t * @param {String} data.message Content of the notification.\n\t * @param {'success'|'info'|'warning'} data.type Type of message.\n\t * @param {String} [data.namespace] Additional event namespace.\n\t * @param {String} [data.title=''] Title of the notification.\n\t */\n\t_showNotification( data ) {\n\t\tconst event = `show:${ data.type }` + ( data.namespace ? `:${ data.namespace }` : '' );\n\n\t\tthis.fire( event, {\n\t\t\tmessage: data.message,\n\t\t\ttype: data.type,\n\t\t\ttitle: data.title || ''\n\t\t} );\n\t}\n\n\t/**\n\t * Fired when one of `showSuccess`, `showInfo`, `showWarning` methods is called.\n\t *\n\t * @event show\n\t * @param {Object} data Notification data.\n\t * @param {String} data.message Content of the notification.\n\t * @param {String} data.title Title of the notification.\n\t * @param {'success'|'info'|'warning'} data.type Type of notification.\n\t */\n\n\t/**\n\t * Fired when `showSuccess` method is called.\n\t *\n\t * @event show:success\n\t * @param {Object} data Notification data.\n\t * @param {String} data.message Content of the notification.\n\t * @param {String} data.title Title of the notification.\n\t * @param {'success'} data.type Type of notification.\n\t */\n\n\t/**\n\t * Fired when `showInfo` method is called.\n\t *\n\t * @event show:info\n\t * @param {Object} data Notification data.\n\t * @param {String} data.message Content of the notification.\n\t * @param {String} data.title Title of the notification.\n\t * @param {'info'} data.type Type of notification.\n\t */\n\n\t/**\n\t * Fired when `showWarning` method is called.\n\t *\n\t * When this event won't be handled and stopped by `event.stop()` then data.message of this event will\n\t * be automatically displayed as system alert.\n\t *\n\t * @event show:warning\n\t * @param {Object} data Notification data.\n\t * @param {String} data.message Content of the notification.\n\t * @param {String} data.title Title of the notification.\n\t * @param {'warning'} data.type Type of notification.\n\t */\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imageupload/imageuploadediting\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';\nimport ImageUploadCommand from '../../src/imageupload/imageuploadcommand';\nimport Notification from '@ckeditor/ckeditor5-ui/src/notification/notification';\nimport ModelSelection from '@ckeditor/ckeditor5-engine/src/model/selection';\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport {\n    isImageType,\n    findOptimalInsertionPosition\n} from '../../src/imageupload/utils';\n/**\n * Image upload editing plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageUploadEditing extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    static get requires() {\n        return [\n            FileRepository,\n            Notification\n        ];\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const doc = editor.model.document;\n        const schema = editor.model.schema;\n        const fileRepository = editor.plugins.get(FileRepository);\n        // Setup schema to allow uploadId and uploadStatus for images.\n        schema.extend('image', {\n            allowAttributes: [\n                'uploadId',\n                'uploadStatus'\n            ]\n        });\n        // Register imageUpload command.\n        editor.commands.add('imageUpload', new ImageUploadCommand(editor));\n        // Execute imageUpload command when image is dropped or pasted.\n        this.listenTo(editor.editing.view.document, 'clipboardInput', (evt, data) => {\n            // Skip if non empty HTML data is included.\n            // https://github.com/ckeditor/ckeditor5-upload/issues/68\n            if (isHtmlIncluded(data.dataTransfer)) {\n                return;\n            }\n            let targetModelSelection = new ModelSelection(data.targetRanges.map(viewRange => editor.editing.mapper.toModelRange(viewRange)));\n            for (const file of data.dataTransfer.files) {\n                if (isImageType(file)) {\n                    const insertAt = findOptimalInsertionPosition(targetModelSelection);\n                    editor.model.change(writer => {\n                        const loader = fileRepository.createLoader(file);\n                        // Do not throw when upload adapter is not set. FileRepository will log an error anyway.\n                        if (!loader) {\n                            return;\n                        }\n                        const imageElement = writer.createElement('image', { uploadId: loader.id });\n                        const targetSelection = new ModelSelection([new ModelRange(insertAt)]);\n                        editor.model.insertContent(imageElement, targetSelection);\n                        // Inserting an image might've failed due to schema regulations.\n                        if (imageElement.parent) {\n                            writer.setSelection(imageElement, 'on');\n                        }\n                    });\n                    evt.stop();\n                }\n                // Use target ranges only for the first image. Then, use that image position\n                // so we keep adding the next ones after the previous one.\n                targetModelSelection = doc.selection;\n            }\n        });\n        // Prevents from browser redirecting to the dropped image.\n        editor.editing.view.document.on('dragover', (evt, data) => {\n            data.preventDefault();\n        });\n        doc.on('change', () => {\n            const changes = doc.differ.getChanges({ includeChangesInGraveyard: true });\n            for (const entry of changes) {\n                if (entry.type == 'insert' && entry.name == 'image') {\n                    const item = entry.position.nodeAfter;\n                    const isInGraveyard = entry.position.root.rootName == '$graveyard';\n                    // Check if the image element still has upload id.\n                    const uploadId = item.getAttribute('uploadId');\n                    if (!uploadId) {\n                        continue;\n                    }\n                    // Check if the image is loaded on this client.\n                    const loader = fileRepository.loaders.get(uploadId);\n                    if (!loader) {\n                        continue;\n                    }\n                    if (isInGraveyard) {\n                        // If the image was inserted to the graveyard - abort the loading process.\n                        loader.abort();\n                    } else if (loader.status == 'idle') {\n                        // If the image was inserted into content and has not been loaded, start loading it.\n                        this._load(loader, item);\n                    }\n                }\n            }\n        });\n    }\n    /**\n\t * Performs image loading. The image is read from the disk and temporary data is displayed. When the upload process\n\t * is complete the temporary data is replaced with the target image from the server.\n\t *\n\t * @private\n\t * @param {module:upload/filerepository~FileLoader} loader\n\t * @param {module:engine/model/element~Element} imageElement\n\t * @returns {Promise}\n\t */\n    _load(loader, imageElement) {\n        const editor = this.editor;\n        const model = editor.model;\n        const t = editor.locale.t;\n        const fileRepository = editor.plugins.get(FileRepository);\n        const notification = editor.plugins.get(Notification);\n        model.enqueueChange('transparent', writer => {\n            writer.setAttribute('uploadStatus', 'reading', imageElement);\n        });\n        return loader.read().then(data => {\n            const viewFigure = editor.editing.mapper.toViewElement(imageElement);\n            const viewImg = viewFigure.getChild(0);\n            const promise = loader.upload();\n            editor.editing.view.change(writer => {\n                writer.setAttribute('src', data, viewImg);\n            });\n            model.enqueueChange('transparent', writer => {\n                writer.setAttribute('uploadStatus', 'uploading', imageElement);\n            });\n            return promise;\n        }).then(data => {\n            model.enqueueChange('transparent', writer => {\n                writer.setAttributes({\n                    uploadStatus: 'complete',\n                    src: data.default\n                }, imageElement);\n                // Srcset attribute for responsive images support.\n                let maxWidth = 0;\n                const srcsetAttribute = Object.keys(data)    // Filter out keys that are not integers.\n.filter(key => {\n                    const width = parseInt(key, 10);\n                    if (!isNaN(width)) {\n                        maxWidth = Math.max(maxWidth, width);\n                        return true;\n                    }\n                })    // Convert each key to srcset entry.\n.map(key => `${ data[key] } ${ key }w`)    // Join all entries.\n.join(', ');\n                if (srcsetAttribute != '') {\n                    writer.setAttribute('srcset', {\n                        data: srcsetAttribute,\n                        width: maxWidth\n                    }, imageElement);\n                }\n            });\n            clean();\n        }).catch(error => {\n            // If status is not 'error' nor 'aborted' - throw error because it means that something else went wrong,\n            // it might be generic error and it would be real pain to find what is going on.\n            if (loader.status !== 'error' && loader.status !== 'aborted') {\n                throw error;\n            }\n            // Might be 'aborted'.\n            if (loader.status == 'error') {\n                notification.showWarning(error, {\n                    title: t('ah'),\n                    namespace: 'upload'\n                });\n            }\n            clean();\n            // Permanently remove image from insertion batch.\n            model.enqueueChange('transparent', writer => {\n                writer.remove(imageElement);\n            });\n        });\n        function clean() {\n            model.enqueueChange('transparent', writer => {\n                writer.removeAttribute('uploadId', imageElement);\n                writer.removeAttribute('uploadStatus', imageElement);\n            });\n            fileRepository.destroyLoader(loader);\n        }\n    }\n}\n// Returns `true` if non-empty `text/html` is included in the data transfer.\n//\n// @param {module:clipboard/datatransfer~DataTransfer} dataTransfer\n// @returns {Boolean}\nexport function isHtmlIncluded(dataTransfer) {\n    return Array.from(dataTransfer.types).includes('text/html') && dataTransfer.getData('text/html') !== '';\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imageupload\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageUploadUI from './imageupload/imageuploadui';\nimport ImageUploadProgress from './imageupload/imageuploadprogress';\nimport ImageUploadEditing from './imageupload/imageuploadediting';\n\n/**\n * The image upload plugin.\n *\n * This plugin does not do anything directly, but it loads a set of specific plugins to enable image uploading:\n * * {@link module:image/imageupload/imageuploadediting~ImageUploadEditing},\n * * {@link module:image/imageupload/imageuploadui~ImageUploadUI},\n * * {@link module:image/imageupload/imageuploadprogress~ImageUploadProgress}.\n *\n * For a detailed overview, check the {@glink features/image-upload image upload feature} documentation.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageUpload extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageUpload';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageUploadEditing, ImageUploadUI, ImageUploadProgress ];\n\t}\n}\n","const childPagesMacroSymbol = Symbol( 'isWpButtonMacroSymbol' );\nimport {toWidget, isWidget} from '@ckeditor/ckeditor5-widget/src/utils';\n\nexport function toChildPagesMacroWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( childPagesMacroSymbol, true, viewElement );\n\treturn toWidget( viewElement, writer, { label: label });\n}\n\n\nexport function isChildPagesMacroWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( childPagesMacroSymbol ) && isWidget( viewElement );\n}\n\n\nexport function isChildPagesMacroWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isChildPagesMacroWidget( viewElement ) );\n}\n","import ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {upcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport ViewRange from '@ckeditor/ckeditor5-engine/src/view/range';\n\nimport {toChildPagesMacroWidget} from './utils';\n\nexport default class OPChildPagesEditing extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPChildPagesEditing';\n\t}\n\n\tstatic get buttonName(){\n\t\treturn \"insertChildPages\";\n\t}\n\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst conversion = editor.conversion;\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'op-macro-child-pages', {\n\t\t\tallowWhere: ['$block'],\n\t\t\tallowAttributes: ['page'],\n\t\t\tisBlock: true,\n\t\t\tisLimit: true\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'macro',\n\t\t\t\t\tclasses: 'child_pages'\n\t\t\t\t},\n\t\t\t\tmodel: ( viewElement, modelWriter ) => {\n\t\t\t\t\tconst page = viewElement.getAttribute( 'data-page' ) || '';\n\t\t\t\t\tconst includeParent = viewElement.getAttribute( 'data-include-parent' ) == 'true';\n\n\t\t\t\t\treturn modelWriter.createElement(\n\t\t\t\t\t\t'op-macro-child-pages',\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\tpage: page,\n\t\t\t\t\t\t\tincludeParent: includeParent\n\t\t\t\t\t\t}\n\t\t\t\t\t);\n\t\t\t\t}\n\t\t\t} ) );\n\n\n\t\tconversion.for( 'editingDowncast' )\n\t\t\t.add(downcastElementToElement({\n\t\t\t\tmodel: 'op-macro-child-pages',\n\t\t\t\tview: (modelElement, writer) => {\n\t\t\t\t\treturn this.createMacroViewElement(modelElement, writer);\n\t\t\t\t}\n\t\t\t}))\n\t\t\t.add(dispatcher => dispatcher.on( 'attribute:page', this.modelAttributeToView.bind(this)))\n\t\t\t.add(dispatcher => dispatcher.on( 'attribute:includeParent', this.modelAttributeToView.bind(this)));\n\n\t\tconversion.for('dataDowncast').add(downcastElementToElement({\n\t\t\tmodel: 'op-macro-child-pages',\n\t\t\tview: (modelElement, writer) => {\n\t\t\t\tconst element = writer.createContainerElement(\n\t\t\t\t\t'macro',\n\t\t\t\t\t{\n\t\t\t\t\t\t'class': 'child_pages',\n\t\t\t\t\t\t'data-page': modelElement.getAttribute('page') || '',\n\t\t\t\t\t\t'data-include-parent': modelElement.getAttribute('includeParent') || ''\n\t\t\t\t\t}\n\t\t\t\t);\n\n\t\t\t\treturn element;\n\t\t\t}\n\t\t}));\n\n\t\teditor.ui.componentFactory.add( OPChildPagesEditing.buttonName, locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: window.I18n.t('js.editor.macro.child_pages.button'),\n\t\t\t\twithText: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\teditor.model.change(writer => {\n\t\t\t\t\tconst element = writer.createElement( 'op-macro-child-pages', {});\n\n\t\t\t\t\teditor.model.insertContent( element, editor.model.document.selection );\n\t\t\t\t});\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tmodelAttributeToView( evt, data, conversionApi ) {\n\t\tconst modelElement = data.item;\n\t\tif (!modelElement.is('op-macro-child-pages')) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Mark element as consumed by conversion.\n\t\tconversionApi.consumable.consume(data.item, evt.name);\n\n\t\t// Get mapped view element to update.\n\t\tconst viewElement = conversionApi.mapper.toViewElement(modelElement);\n\n\t\t// Remove current <div> element contents.\n\t\tconversionApi.writer.remove(ViewRange.createIn(viewElement));\n\n\t\t// Set current content\n\t\tthis.setPlaceholderContent(conversionApi.writer, modelElement, viewElement);\n\t}\n\n\tmacroLabel() {\n\t\treturn window.I18n.t('js.editor.macro.child_pages.text');\n\t}\n\n\tpageLabel(page) {\n\t\tif (page && page.length > 0) {\n\t\t\treturn page\n\t\t} else {\n\t\t\treturn window.I18n.t('js.editor.macro.child_pages.this_page');\n\t\t}\n\t}\n\n\tincludeParentText(includeParent) {\n\t\tif (includeParent) {\n\t\t\treturn ` (${window.I18n.t('js.editor.macro.child_pages.include_parent')})`;\n\t\t} else {\n\t\t\treturn '';\n\t\t}\n\t}\n\n\tcreateMacroViewElement(modelElement, writer) {\n\t\tconst placeholderContainer = writer.createContainerElement( 'div', { class: 'macro -child_pages' } );\n\n\t\tthis.setPlaceholderContent( writer, modelElement, placeholderContainer );\n\n\t\treturn toChildPagesMacroWidget(placeholderContainer, writer, { label: this.macroLabel() } )\n\t}\n\n\tsetPlaceholderContent(writer, modelElement, placeholderContainer ) {\n\t\tconst page = modelElement.getAttribute('page');\n\t\tconst includeParent = modelElement.getAttribute('includeParent');\n\t\tconst macroLabel = this.macroLabel();\n\t\tconst pageLabel = this.pageLabel(page);\n\t\tconst pageLabelContainer = writer.createContainerElement( 'span', { class: 'macro-value' } );\n\t\tlet placeholderContent = [ writer.createText( `${macroLabel} ` ) ];\n\t\twriter.insert( ViewPosition.createAt( pageLabelContainer ), writer.createText( `${pageLabel}` ) )\n\t\tplaceholderContent.push( pageLabelContainer );\n\t\tplaceholderContent.push( writer.createText( this.includeParentText(includeParent) ));\n\n\t\twriter.insert( ViewPosition.createAt( placeholderContainer ), placeholderContent );\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\n\nimport {isChildPagesMacroWidgetSelected} from './utils';\nimport {createToolbarEditButton} from '../../helpers/create-toolbar-edit-button';\nimport {createEditToolbar} from '../../helpers/create-toolbar';\n\n\nconst balloonClassName = 'ck-toolbar-container';\n\nexport default class OPChildPagesToolbar extends Plugin {\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPChildPagesToolbar';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Add editing button\n\t\tcreateToolbarEditButton( editor, 'opEditChildPagesMacroButton', widget => {\n\t\t\tconst macroService = pluginContext.services.macros;\n\t\t\tconst pageAttribute = widget.getAttribute('page');\n\t\t\tconst includeParent = widget.getAttribute('includeParent');\n\t\t\tconst page = (pageAttribute && pageAttribute.length > 0) ? pageAttribute : '';\n\t\t\tmacroService\n\t\t\t\t.configureChildPages(page, includeParent)\n\t\t\t\t.then((macroConf) => model.change(writer => {\n\t\t\t\t\t\twriter.setAttribute( 'page', macroConf.page, widget );\n\t\t\t\t\t\twriter.setAttribute( 'includeParent', macroConf.includeParent, widget );\n\t\t\t\t\t})\n\t\t\t\t);\n\t\t} );\n\t}\n\n\tafterInit() {\n\t\t// Add actual toolbar\n\t\tcreateEditToolbar(\n\t\t\tthis,\n\t\t\tthis.editor,\n\t\t\t'OPChildPages',\n\t\t\tisChildPagesMacroWidgetSelected\n\t\t);\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/datatransfer\n */\n\n/**\n * Facade over the native [`DataTransfer`](https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer) object.\n */\nexport default class DataTransfer {\n\tconstructor( nativeDataTransfer ) {\n\t\t/**\n\t\t * The array of files created from the native `DataTransfer#files` or `DataTransfer#items`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<File>} #files\n\t\t */\n\t\tthis.files = getFiles( nativeDataTransfer );\n\n\t\t/**\n\t\t * The native DataTransfer object.\n\t\t *\n\t\t * @private\n\t\t * @member {DataTransfer} #_native\n\t\t */\n\t\tthis._native = nativeDataTransfer;\n\t}\n\n\t/**\n\t * Returns an array of available native content types.\n\t *\n\t * @returns {Array.<String>}\n\t */\n\tget types() {\n\t\treturn this._native.types;\n\t}\n\n\t/**\n\t * Gets data from the data transfer by its mime type.\n\t *\n\t *\t\tdataTransfer.getData( 'text/plain' );\n\t *\n\t * @param {String} type The mime type. E.g. `text/html` or `text/plain`.\n\t * @returns {String}\n\t */\n\tgetData( type ) {\n\t\treturn this._native.getData( type );\n\t}\n\n\t/**\n\t * Sets data in the data transfer.\n\t *\n\t * @param {String} type The mime type. E.g. `text/html` or `text/plain`.\n\t * @param {String} data\n\t */\n\tsetData( type, data ) {\n\t\tthis._native.setData( type, data );\n\t}\n}\n\nfunction getFiles( nativeDataTransfer ) {\n\t// DataTransfer.files and items are Array-like and might not have an iterable interface.\n\tconst files = nativeDataTransfer.files ? Array.from( nativeDataTransfer.files ) : [];\n\tconst items = nativeDataTransfer.items ? Array.from( nativeDataTransfer.items ) : [];\n\n\tif ( files.length ) {\n\t\treturn files;\n\t}\n\t// Chrome have empty DataTransfer.files, but let get files through the items interface.\n\treturn items\n\t\t.filter( item => item.kind === 'file' )\n\t\t.map( item => item.getAsFile() );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/clipboardobserver\n */\n\nimport DomEventObserver from '@ckeditor/ckeditor5-engine/src/view/observer/domeventobserver';\nimport DataTransfer from './datatransfer';\n\n/**\n * Clipboard events observer.\n *\n * Fires the following events:\n *\n * * {@link module:engine/view/document~Document#event:clipboardInput}\n * * {@link module:engine/view/document~Document#event:dragover}\n * * {@link module:engine/view/document~Document#event:drop}\n * * {@link module:engine/view/document~Document#event:paste}\n * * {@link module:engine/view/document~Document#event:copy}\n * * {@link module:engine/view/document~Document#event:cut}\n *\n * Note that this observer is not available by default. To make it available it needs to be added to\n * {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class ClipboardObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst viewDocument = this.document;\n\n\t\tthis.domEventType = [ 'paste', 'copy', 'cut', 'drop', 'dragover' ];\n\n\t\tthis.listenTo( viewDocument, 'paste', handleInput, { priority: 'low' } );\n\t\tthis.listenTo( viewDocument, 'drop', handleInput, { priority: 'low' } );\n\n\t\tfunction handleInput( evt, data ) {\n\t\t\tdata.preventDefault();\n\n\t\t\tconst targetRanges = data.dropRange ? [ data.dropRange ] : Array.from( viewDocument.selection.getRanges() );\n\n\t\t\tviewDocument.fire( 'clipboardInput', {\n\t\t\t\tdataTransfer: data.dataTransfer,\n\t\t\t\ttargetRanges\n\t\t\t} );\n\t\t}\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tconst evtData = {\n\t\t\tdataTransfer: new DataTransfer( domEvent.clipboardData ? domEvent.clipboardData : domEvent.dataTransfer )\n\t\t};\n\n\t\tif ( domEvent.type == 'drop' ) {\n\t\t\tevtData.dropRange = getDropViewRange( this.view, domEvent );\n\t\t}\n\n\t\tthis.fire( domEvent.type, domEvent, evtData );\n\t}\n}\n\nfunction getDropViewRange( view, domEvent ) {\n\tconst domDoc = domEvent.target.ownerDocument;\n\tconst x = domEvent.clientX;\n\tconst y = domEvent.clientY;\n\tlet domRange;\n\n\t// Webkit & Blink.\n\tif ( domDoc.caretRangeFromPoint && domDoc.caretRangeFromPoint( x, y ) ) {\n\t\tdomRange = domDoc.caretRangeFromPoint( x, y );\n\t}\n\t// FF.\n\telse if ( domEvent.rangeParent ) {\n\t\tdomRange = domDoc.createRange();\n\t\tdomRange.setStart( domEvent.rangeParent, domEvent.rangeOffset );\n\t\tdomRange.collapse( true );\n\t}\n\n\tif ( domRange ) {\n\t\treturn view.domConverter.domRangeToView( domRange );\n\t} else {\n\t\treturn view.document.selection.getFirstRange();\n\t}\n}\n\n/**\n * Fired as a continuation of {@link #event:paste} and {@link #event:drop} events.\n * It's part of the {@link module:clipboard/clipboard~Clipboard \"clipboard pipeline\"}.\n *\n * Fired with a `dataTransfer` which comes from the clipboard and which content should be processed\n * and inserted into the editor.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:engine/view/document~Document#event:clipboardInput\n * @param {Object} data Event data.\n * @param {module:clipboard/datatransfer~DataTransfer} data.dataTransfer Data transfer instance.\n * @param {Array.<module:engine/view/range~Range>} data.targetRanges Ranges which are the target of the operation\n * (usually – into which the content should be inserted).\n * If clipboard input was triggered by a paste operation, then these are the selection ranges. If by a drop operation,\n * then it's the drop position (which can be different than the selection at the moment of drop).\n */\n\n/**\n * Fired when user drags content over one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:dragover\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data Event data.\n */\n\n/**\n * Fired when user dropped content into one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:drop\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data Event data.\n * @param {module:engine/view/range~Range} dropRange The position into which the content is dropped.\n */\n\n/**\n * Fired when user pasted content into one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:engine/view/document~Document#event:clipboardInput\n * @event module:engine/view/document~Document#event:paste\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data Event data.\n */\n\n/**\n * Fired when user copied content from one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @event module:engine/view/document~Document#event:copy\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data Event data.\n */\n\n/**\n * Fired when user cut content from one of the editables.\n *\n * Introduced by {@link module:clipboard/clipboardobserver~ClipboardObserver}.\n *\n * Note that this event is not available by default. To make it available {@link module:clipboard/clipboardobserver~ClipboardObserver}\n * needs to be added to {@link module:engine/view/document~Document} by the {@link module:engine/view/view~View#addObserver} method.\n * It's done by the {@link module:clipboard/clipboard~Clipboard} feature. If it's not loaded, it must be done manually.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @event module:engine/view/document~Document#event:cut\n * @param {module:clipboard/clipboardobserver~ClipboardEventData} data Event data.\n */\n\n/**\n * The value of the {@link module:engine/view/document~Document#event:paste},\n * {@link module:engine/view/document~Document#event:copy} and {@link module:engine/view/document~Document#event:cut} events.\n *\n * In order to access clipboard data use `dataTransfer` property.\n *\n * @class module:clipboard/clipboardobserver~ClipboardEventData\n * @extends module:engine/view/observer/domeventdata~DomEventData\n */\n\n/**\n * Data transfer instance.\n *\n * @readonly\n * @member {module:clipboard/datatransfer~DataTransfer} module:clipboard/clipboardobserver~ClipboardEventData#dataTransfer\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/utils/viewtoplaintext\n */\n\n// Elements which should not have empty-line padding.\n// Most `view.ContainerElement` want to be separate by new-line, but some are creating one structure\n// together (like `<li>`) so it is better to separate them by only one \"\\n\".\nconst smallPaddingElements = [ 'figcaption', 'li' ];\n\n/**\n * Converts {@link module:engine/view/item~Item view item} and all of its children to plain text.\n *\n * @param {module:engine/view/item~Item} viewItem View item to convert.\n * @returns {String} Plain text representation of `viewItem`.\n */\nexport default function viewToPlainText( viewItem ) {\n\tlet text = '';\n\n\tif ( viewItem.is( 'text' ) || viewItem.is( 'textProxy' ) ) {\n\t\t// If item is `Text` or `TextProxy` simple take its text data.\n\t\ttext = viewItem.data;\n\t} else if ( viewItem.is( 'img' ) && viewItem.hasAttribute( 'alt' ) ) {\n\t\t// Special case for images - use alt attribute if it is provided.\n\t\ttext = viewItem.getAttribute( 'alt' );\n\t} else {\n\t\t// Other elements are document fragments, attribute elements or container elements.\n\t\t// They don't have their own text value, so convert their children.\n\t\tlet prev = null;\n\n\t\tfor ( const child of viewItem.getChildren() ) {\n\t\t\tconst childText = viewToPlainText( child );\n\n\t\t\t// Separate container element children with one or more new-line characters.\n\t\t\tif ( prev && ( prev.is( 'containerElement' ) || child.is( 'containerElement' ) ) ) {\n\t\t\t\tif ( smallPaddingElements.includes( prev.name ) || smallPaddingElements.includes( child.name ) ) {\n\t\t\t\t\ttext += '\\n';\n\t\t\t\t} else {\n\t\t\t\t\ttext += '\\n\\n';\n\t\t\t\t}\n\t\t\t}\n\n\t\t\ttext += childText;\n\t\t\tprev = child;\n\t\t}\n\t}\n\n\treturn text;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/clipboard\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport ClipboardObserver from './clipboardobserver';\n\nimport plainTextToHtml from './utils/plaintexttohtml';\nimport normalizeClipboardHtml from './utils/normalizeclipboarddata';\nimport viewToPlainText from './utils/viewtoplaintext.js';\n\nimport HtmlDataProcessor from '@ckeditor/ckeditor5-engine/src/dataprocessor/htmldataprocessor';\n\n/**\n * The clipboard feature. Currently, it's responsible for intercepting the `paste` and `drop` events and\n * passing the pasted content through the clipboard pipeline.\n *\n * # Clipboard input pipeline\n *\n * The feature creates the clipboard input pipeline which allows processing clipboard content\n * before it gets inserted into the editor. The pipeline consists of two events on which\n * the features can listen in order to modify or totally override the default behavior.\n *\n * ## On {@link module:engine/view/document~Document#event:paste} and {@link module:engine/view/document~Document#event:drop}\n *\n * The default action is to:\n *\n * 1. get HTML or plain text from the clipboard,\n * 2. prevent the default action of the native `paste` or `drop` event,\n * 3. fire {@link module:engine/view/document~Document#event:clipboardInput} with a\n * {@link module:clipboard/datatransfer~DataTransfer `dataTransfer`} property.\n * 4. fire {@link module:clipboard/clipboard~Clipboard#event:inputTransformation} with a `data` containing the clipboard data parsed to\n * a {@link module:engine/view/documentfragment~DocumentFragment view document fragment}.\n *\n * These action are performed by a low priority listeners, so they can be overridden by a normal ones\n * when a deeper change in pasting behavior is needed. For example, a feature which wants to differently read\n * data from the clipboard (the {@link module:clipboard/datatransfer~DataTransfer `DataTransfer`}).\n * should plug a listener at this stage.\n *\n * ## On {@link module:engine/view/document~Document#event:clipboardInput}\n *\n * This action is performed by a low priority listener, so it can be overridden by a normal one.\n *\n * At this stage the dataTransfer object can be processed by the features, which want to transform the original dataTransform.\n *\n *\t\tthis.listenTo( editor.editing.view, 'clipboardInput', ( evt, data ) => {\n *\t\t\tconst content = customTransform( data.dataTransfer.get( 'text/html' ) );\n *\t\t\tconst transformedContent = transform( content );\n *\t\t\tdata.dataTransfer.set( 'text/html', transformedContent );\n *\t\t} );\n *\n * ## On {@link module:clipboard/clipboard~Clipboard#event:inputTransformation}\n *\n * The default action is to insert the content (`data.content`, represented by a\n * {@link module:engine/view/documentfragment~DocumentFragment}) to an editor if the data is not empty.\n *\n * This action is performed by a low priority listener, so it can be overridden by a normal one.\n *\n * At this stage the pasted content can be processed by the features. E.g. a feature which wants to transform\n * a pasted text into a link can be implemented in this way:\n *\n *\t\tthis.listenTo( editor.plugins.get( 'Clipboard' ), 'inputTransformation', ( evt, data ) => {\n *\t\t\tif ( data.content.childCount == 1 && isUrlText( data.content.getChild( 0 ) ) ) {\n *\t\t\t\tconst linkUrl = data.content.getChild( 0 ).data;\n *\n *\t\t\t\tdata.content = new ViewDocumentFragment( [\n *\t\t\t\t\tViewElement(\n *\t\t\t\t\t\t'a',\n *\t\t\t\t\t\t{ href: linkUrl },\n *\t\t\t\t\t\t[ new ViewText( linkUrl ) ]\n *\t\t\t\t\t)\n *\t\t\t\t] );\n *\t\t\t}\n *\t\t} );\n *\n * # Clipboard output pipeline\n *\n * The output pipeline is the equivalent of the input pipeline but for the copy and cut operations.\n * It allows to process the content which will be then put into the clipboard or to override the whole process.\n *\n * ## On {@link module:engine/view/document~Document#event:copy} and {@link module:engine/view/document~Document#event:cut}\n *\n * The default action is to:\n *\n * 1. {@link module:engine/model/model~Model#getSelectedContent get selected content} from the editor,\n * 2. prevent the default action of the native `copy` or `cut` event,\n * 3. fire {@link module:engine/view/document~Document#event:clipboardOutput} with a clone of the selected content\n * converted to a {@link module:engine/view/documentfragment~DocumentFragment view document fragment}.\n *\n * ## On {@link module:engine/view/document~Document#event:clipboardOutput}\n *\n * The default action is to put the content (`data.content`, represented by a\n * {@link module:engine/view/documentfragment~DocumentFragment}) to the clipboard as HTML. In case of the cut operation,\n * the selected content is also deleted from the editor.\n *\n * This action is performed by a low priority listener, so it can be overridden by a normal one.\n *\n * At this stage the copied/cut content can be processed by the features.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Clipboard extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Clipboard';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst modelDocument = editor.model.document;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t/**\n\t\t * Data processor used to convert pasted HTML to a view structure.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/dataprocessor/htmldataprocessor~HtmlDataProcessor} #_htmlDataProcessor\n\t\t */\n\t\tthis._htmlDataProcessor = new HtmlDataProcessor();\n\n\t\tview.addObserver( ClipboardObserver );\n\n\t\t// The clipboard paste pipeline.\n\n\t\t// Pasting and dropping is disabled when editor is read-only.\n\t\t// See: https://github.com/ckeditor/ckeditor5-clipboard/issues/26.\n\t\tthis.listenTo( viewDocument, 'clipboardInput', evt => {\n\t\t\tif ( editor.isReadOnly ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.listenTo( viewDocument, 'clipboardInput', ( evt, data ) => {\n\t\t\tconst dataTransfer = data.dataTransfer;\n\t\t\tlet content = '';\n\n\t\t\tif ( dataTransfer.getData( 'text/html' ) ) {\n\t\t\t\tcontent = normalizeClipboardHtml( dataTransfer.getData( 'text/html' ) );\n\t\t\t} else if ( dataTransfer.getData( 'text/plain' ) ) {\n\t\t\t\tcontent = plainTextToHtml( dataTransfer.getData( 'text/plain' ) );\n\t\t\t}\n\n\t\t\tcontent = this._htmlDataProcessor.toView( content );\n\n\t\t\tthis.fire( 'inputTransformation', { content } );\n\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\n\t\tthis.listenTo( this, 'inputTransformation', ( evt, data ) => {\n\t\t\tif ( !data.content.isEmpty ) {\n\t\t\t\tconst dataController = this.editor.data;\n\t\t\t\tconst model = this.editor.model;\n\n\t\t\t\t// Convert the pasted content to a model document fragment.\n\t\t\t\t// Conversion is contextual, but in this case we need an \"all allowed\" context and for that\n\t\t\t\t// we use the $clipboardHolder item.\n\t\t\t\tconst modelFragment = dataController.toModel( data.content, '$clipboardHolder' );\n\n\t\t\t\tif ( modelFragment.childCount == 0 ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tmodel.insertContent( modelFragment, modelDocument.selection );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// The clipboard copy/cut pipeline.\n\n\t\tfunction onCopyCut( evt, data ) {\n\t\t\tconst dataTransfer = data.dataTransfer;\n\n\t\t\tdata.preventDefault();\n\n\t\t\tconst content = editor.data.toView( editor.model.getSelectedContent( modelDocument.selection ) );\n\n\t\t\tviewDocument.fire( 'clipboardOutput', { dataTransfer, content, method: evt.name } );\n\t\t}\n\n\t\tthis.listenTo( viewDocument, 'copy', onCopyCut, { priority: 'low' } );\n\t\tthis.listenTo( viewDocument, 'cut', ( evt, data ) => {\n\t\t\t// Cutting is disabled when editor is read-only.\n\t\t\t// See: https://github.com/ckeditor/ckeditor5-clipboard/issues/26.\n\t\t\tif ( editor.isReadOnly ) {\n\t\t\t\tdata.preventDefault();\n\t\t\t} else {\n\t\t\t\tonCopyCut( evt, data );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\tthis.listenTo( viewDocument, 'clipboardOutput', ( evt, data ) => {\n\t\t\tif ( !data.content.isEmpty ) {\n\t\t\t\tdata.dataTransfer.setData( 'text/html', this._htmlDataProcessor.toData( data.content ) );\n\t\t\t\tdata.dataTransfer.setData( 'text/plain', viewToPlainText( data.content ) );\n\t\t\t}\n\n\t\t\tif ( data.method == 'cut' ) {\n\t\t\t\teditor.model.deleteContent( modelDocument.selection );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\t}\n}\n\n/**\n * Fired with a `content`, which comes from the clipboard (was pasted or dropped) and\n * should be processed in order to be inserted into the editor.\n * It's part of the {@link module:clipboard/clipboard~Clipboard \"clipboard pipeline\"}.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:clipboard/clipboard~Clipboard#event:inputTransformation\n * @param {Object} data Event data.\n * @param {module:engine/view/documentfragment~DocumentFragment} data.content Event data. Content to be inserted into the editor.\n * It can be modified by the event listeners. Read more about the clipboard pipelines in {@link module:clipboard/clipboard~Clipboard}\n */\n\n/**\n * Fired on {@link module:engine/view/document~Document#event:copy} and {@link module:engine/view/document~Document#event:cut}\n * with a copy of selected content. The content can be processed before it ends up in the clipboard.\n * It's part of the {@link module:clipboard/clipboard~Clipboard \"clipboard pipeline\"}.\n *\n * @see module:clipboard/clipboardobserver~ClipboardObserver\n * @see module:clipboard/clipboard~Clipboard\n * @event module:engine/view/document~Document#event:clipboardOutput\n * @param {module:clipboard/clipboard~ClipboardOutputEventData} data Event data.\n */\n\n/**\n * The value of the {@link module:engine/view/document~Document#event:clipboardOutput} event.\n *\n * @class module:clipboard/clipboard~ClipboardOutputEventData\n */\n\n/**\n * Data transfer instance.\n *\n * @readonly\n * @member {module:clipboard/datatransfer~DataTransfer} module:clipboard/clipboard~ClipboardOutputEventData#dataTransfer\n */\n\n/**\n * Content to be put into the clipboard. It can be modified by the event listeners.\n * Read more about the clipboard pipelines in {@link module:clipboard/clipboard~Clipboard}.\n *\n * @member {module:engine/view/documentfragment~DocumentFragment} module:clipboard/clipboard~ClipboardOutputEventData#content\n */\n\n/**\n * Whether the event was triggered by copy or cut operation.\n *\n * @member {'copy'|'cut'} module:clipboard/clipboard~ClipboardOutputEventData#method\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/utils/normalizeclipboarddata\n */\n\n/**\n * Removes some popular browser quirks out of the clipboard data (HTML).\n *\n * @param {String} data The HTML data to normalize.\n * @returns {String} Normalized HTML.\n */\nexport default function normalizeClipboardData( data ) {\n\treturn data\n\t\t.replace( /<span(?: class=\"Apple-converted-space\"|)>(\\s+)<\\/span>/g, ( fullMatch, spaces ) => {\n\t\t\t// Handle the most popular and problematic case when even a single space becomes an nbsp;.\n\t\t\t// Decode those to normal spaces. Read more in https://github.com/ckeditor/ckeditor5-clipboard/issues/2.\n\t\t\tif ( spaces.length == 1 ) {\n\t\t\t\treturn ' ';\n\t\t\t}\n\n\t\t\treturn spaces;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module clipboard/utils/plaintexttohtml\n */\n\n/**\n * Converts plain text to its HTML-ized version.\n *\n * @param {String} text The plain text to convert.\n * @returns {String} HTML generated from the plain text.\n */\nexport default function plainTextToHtml( text ) {\n\ttext = text\n\t\t// Encode <>.\n\t\t.replace( /</g, '&lt;' )\n\t\t.replace( />/g, '&gt;' )\n\t\t// Creates paragraphs for double line breaks and change single line breaks to <br>s.\n\t\t.replace( /\\n\\n/g, '</p><p>' )\n\t\t.replace( /\\n/g, '<br>' )\n\t\t// Preserve trailing spaces (only the first and last one – the rest is handled below).\n\t\t.replace( /^\\s/, '&nbsp;' )\n\t\t.replace( /\\s$/, '&nbsp;' )\n\t\t// Preserve other subsequent spaces now.\n\t\t.replace( /\\s\\s/g, ' &nbsp;' );\n\n\tif ( text.indexOf( '</p><p>' ) > -1 ) {\n\t\t// If we created paragraphs above, add the trailing ones.\n\t\ttext = `<p>${ text }</p>`;\n\t}\n\n\t// TODO:\n\t// * What about '\\nfoo' vs ' foo'?\n\n\treturn text;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module enter/enterobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\nimport DomEventData from '@ckeditor/ckeditor5-engine/src/view/observer/domeventdata';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Enter observer introduces the {@link module:engine/view/document~Document#event:enter} event.\n *\n * @extends module:engine/view/observer~Observer\n */\nexport default class EnterObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst doc = this.document;\n\n\t\tdoc.on( 'keydown', ( evt, data ) => {\n\t\t\tif ( this.isEnabled && data.keyCode == keyCodes.enter ) {\n\t\t\t\t// Save the event object to check later if it was stopped or not.\n\t\t\t\tlet event;\n\t\t\t\tdoc.once( 'enter', evt => ( event = evt ), { priority: 'highest' } );\n\n\t\t\t\tdoc.fire( 'enter', new DomEventData( doc, data.domEvent, {\n\t\t\t\t\tisSoft: data.shiftKey\n\t\t\t\t} ) );\n\n\t\t\t\t// Stop `keydown` event if `enter` event was stopped.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5/issues/753\n\t\t\t\tif ( event && event.stop.called ) {\n\t\t\t\t\tevt.stop();\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {}\n}\n\n/**\n * Event fired when the user presses the <kbd>Enter</kbd> key.\n *\n * Note: This event is fired by the {@link module:enter/enterobserver~EnterObserver observer}\n * (usually registered by the {@link module:enter/enter~Enter Enter feature} and\n * {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature}).\n *\n * @event module:engine/view/document~Document#event:enter\n * @param {module:engine/view/observer/domeventdata~DomEventData} data\n * @param {Boolean} data.isSoft Whether it's a soft enter (<kbd>Shift</kbd>+<kbd>Enter</kbd>) or hard enter (<kbd>Enter</kbd>).\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module enter/enter\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport EnterCommand from './entercommand';\nimport EnterObserver from './enterobserver';\n\n/**\n * This plugin handles the <kbd>Enter</kbd> key (hard line break) in the editor.\n *\n * See also the {@link module:enter/shiftenter~ShiftEnter} plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Enter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Enter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'enter', new EnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\t// The soft enter key is handled by the ShiftEnter plugin.\n\t\t\tif ( data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'enter' );\n\t\t\tdata.preventDefault();\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @module enter/shiftentercommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * ShiftEnter command. It is used by the {@link module:enter/shiftenter~ShiftEnter ShiftEnter feature} to handle\n * the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke.\n *\n * @extends module:core/command~Command\n */\nexport default class ShiftEnterCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tsoftBreakAction( model, writer, doc.selection );\n\t\t\tthis.fire( 'afterExecute', { writer } );\n\t\t} );\n\t}\n\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tthis.isEnabled = isEnabled( model.schema, doc.selection );\n\t}\n}\n\n// Checks whether the ShiftEnter command should be enabled in the specified selection.\n//\n// @param {module:engine/model/schema~Schema} schema\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\nfunction isEnabled( schema, selection ) {\n\t// At this moment it is okay to support single range selections only.\n\t// But in the future we may need to change that.\n\tif ( selection.rangeCount > 1 ) {\n\t\treturn false;\n\t}\n\n\tconst anchorPos = selection.anchor;\n\n\t// Check whether the break element can be inserted in the current selection anchor.\n\tif ( !anchorPos || !schema.checkChild( anchorPos, 'softBreak' ) ) {\n\t\treturn false;\n\t}\n\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\n\t// Do not modify the content if selection is cross-limit elements.\n\tif ( ( isInsideLimitElement( startElement, schema ) || isInsideLimitElement( endElement, schema ) ) && startElement !== endElement ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n\n// Creates a break in the way that the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke is expected to work.\n//\n// @param {module:engine/model~Model} model\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} selection\n// Selection on which the action should be performed.\nfunction softBreakAction( model, writer, selection ) {\n\tconst isSelectionEmpty = selection.isCollapsed;\n\tconst range = selection.getFirstRange();\n\tconst startElement = range.start.parent;\n\tconst endElement = range.end.parent;\n\tconst isContainedWithinOneElement = ( startElement == endElement );\n\n\tif ( isSelectionEmpty ) {\n\t\tinsertBreak( writer, range.end );\n\t} else {\n\t\tconst leaveUnmerged = !( range.start.isAtStart && range.end.isAtEnd );\n\t\tmodel.deleteContent( selection, { leaveUnmerged } );\n\n\t\t// Selection within one element:\n\t\t//\n\t\t// <h>x[xx]x</h>\t\t-> <h>x^x</h>\t\t\t-> <h>x<br>^x</h>\n\t\tif ( isContainedWithinOneElement ) {\n\t\t\tinsertBreak( writer, selection.focus );\n\t\t}\n\t\t// Selection over multiple elements.\n\t\t//\n\t\t// <h>x[x</h><p>y]y<p>\t-> <h>x^</h><p>y</p>\t-> <h>x</h><p>^y</p>\n\t\t//\n\t\t// We chose not to insert a line break in this case because:\n\t\t//\n\t\t// * it's not a very common scenario,\n\t\t// * it actually surprised me when I saw the \"expected behavior\" in real life.\n\t\t//\n\t\t// It's ok if the user will need to be more specific where they want the <br> to be inserted.\n\t\telse {\n\t\t\t// Move the selection to the 2nd element (last step of the example above).\n\t\t\tif ( leaveUnmerged ) {\n\t\t\t\twriter.setSelection( endElement, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n\nfunction insertBreak( writer, position ) {\n\tconst breakLineElement = writer.createElement( 'softBreak' );\n\n\twriter.insert( breakLineElement, position );\n\twriter.setSelection( breakLineElement, 'after' );\n}\n\n// Checks whether the specified `element` is a child of the limit element.\n//\n// Checking whether the `<p>` element is inside a limit element:\n//   - <$root><p>Text.</p></$root> => false\n//   - <$root><limitElement><p>Text</p></limitElement></$root> => true\n//\n// @param {module:engine/model/element~Element} element\n// @param {module:engine/schema~Schema} schema\n// @returns {Boolean}\nfunction isInsideLimitElement( element, schema ) {\n\t// `$root` is a limit element but in this case is an invalid element.\n\tif ( element.is( 'rootElement' ) ) {\n\t\treturn false;\n\t}\n\n\treturn schema.isLimit( element ) || isInsideLimitElement( element.parent, schema );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module enter/shiftenter\n */\n\nimport ShiftEnterCommand from './shiftentercommand';\nimport EnterObserver from './enterobserver';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport { upcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\n\n/**\n * This plugin handles the <kbd>Shift</kbd>+<kbd>Enter</kbd> keystroke (soft line break) in the editor.\n *\n * See also the {@link module:enter/enter~Enter} plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ShiftEnter extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ShiftEnter';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst conversion = editor.conversion;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\t// Configure the schema.\n\t\tschema.register( 'softBreak', {\n\t\t\tallowWhere: '$text'\n\t\t} );\n\n\t\t// Configure converters.\n\t\tconversion.for( 'upcast' )\n\t\t\t.add( upcastElementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: 'br'\n\t\t\t} ) );\n\n\t\tconversion.for( 'downcast' )\n\t\t\t.add( downcastElementToElement( {\n\t\t\t\tmodel: 'softBreak',\n\t\t\t\tview: ( modelElement, viewWriter ) => viewWriter.createEmptyElement( 'br' )\n\t\t\t} ) );\n\n\t\tview.addObserver( EnterObserver );\n\n\t\teditor.commands.add( 'shiftEnter', new ShiftEnterCommand( editor ) );\n\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\t// The hard enter key is handled by the Enter plugin.\n\t\t\tif ( !data.isSoft ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teditor.execute( 'shiftEnter' );\n\t\t\tdata.preventDefault();\n\t\t\tview.scrollToTheSelection();\n\t\t}, { priority: 'low' } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/utils/changebuffer\n */\n\nimport Batch from '@ckeditor/ckeditor5-engine/src/model/batch';\n\n/**\n * Change buffer allows to group atomic changes (like characters that have been typed) into\n * {@link module:engine/model/batch~Batch batches}.\n *\n * Batches represent single undo steps, hence changes added to one single batch are undone together.\n *\n * The buffer has a configurable limit of atomic changes that it can accommodate. After the limit was\n * exceeded (see {@link ~ChangeBuffer#input}), a new batch is created in {@link ~ChangeBuffer#batch}.\n *\n * To use the change buffer you need to let it know about the number of changes that were added to the batch:\n *\n *\t\tconst buffer = new ChangeBuffer( model, LIMIT );\n *\n *\t\t// Later on in your feature:\n *\t\tbuffer.batch.insert( pos, insertedCharacters );\n *\t\tbuffer.input( insertedCharacters.length );\n *\n */\nexport default class ChangeBuffer {\n\t/**\n\t * Creates a new instance of the change buffer.\n\t *\n\t * @param {module:engine/model/model~Model} model\n\t * @param {Number} [limit=20] The maximum number of atomic changes which can be contained in one batch.\n\t */\n\tconstructor( model, limit = 20 ) {\n\t\t/**\n\t\t * The model instance.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model} #model\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The number of atomic changes in the buffer. Once it exceeds the {@link #limit},\n\t\t * the {@link #batch batch} is set to a new one.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #size\n\t\t */\n\t\tthis.size = 0;\n\n\t\t/**\n\t\t * The maximum number of atomic changes which can be contained in one batch.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} #limit\n\t\t */\n\t\tthis.limit = limit;\n\n\t\t/**\n\t\t * Whether the buffer is locked. A locked buffer cannot be reset unless it gets unlocked.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isLocked\n\t\t */\n\t\tthis.isLocked = false;\n\n\t\t// The function to be called in order to notify the buffer about batches which appeared in the document.\n\t\t// The callback will check whether it is a new batch and in that case the buffer will be flushed.\n\t\t//\n\t\t// The reason why the buffer needs to be flushed whenever a new batch appears is that the changes added afterwards\n\t\t// should be added to a new batch. For instance, when the  user types, then inserts an image, and then types again,\n\t\t// the characters typed after inserting the image should be added to a different batch than the characters typed before.\n\t\tthis._changeCallback = ( evt, batch ) => {\n\t\t\tif ( batch.type != 'transparent' && batch !== this._batch ) {\n\t\t\t\tthis._reset( true );\n\t\t\t}\n\t\t};\n\n\t\tthis._selectionChangeCallback = () => {\n\t\t\tthis._reset();\n\t\t};\n\n\t\tthis.model.document.on( 'change', this._changeCallback );\n\n\t\tthis.model.document.selection.on( 'change:range', this._selectionChangeCallback );\n\t\tthis.model.document.selection.on( 'change:attribute', this._selectionChangeCallback );\n\n\t\t/**\n\t\t * The current batch instance.\n\t\t *\n\t\t * @private\n\t\t * @member #_batch\n\t\t */\n\n\t\t/**\n\t\t * The callback to document the change event which later needs to be removed.\n\t\t *\n\t\t * @private\n\t\t * @member #_changeCallback\n\t\t */\n\n\t\t/**\n\t\t * The callback to document selection `change:attribute` and `change:range` events which resets the buffer.\n\t\t *\n\t\t * @private\n\t\t * @member #_selectionChangeCallback\n\t\t */\n\t}\n\n\t/**\n\t * The current batch to which a feature should add its deltas. Once the {@link #size}\n\t * is reached or exceeds the {@link #limit}, the batch is set to a new instance and the size is reset.\n\t *\n\t * @type {module:engine/model/batch~Batch}\n\t */\n\tget batch() {\n\t\tif ( !this._batch ) {\n\t\t\tthis._batch = new Batch();\n\t\t}\n\n\t\treturn this._batch;\n\t}\n\n\t/**\n\t * The input number of changes into the buffer. Once the {@link #size} is\n\t * reached or exceeds the {@link #limit}, the batch is set to a new instance and the size is reset.\n\t *\n\t * @param {Number} changeCount The number of atomic changes to input.\n\t */\n\tinput( changeCount ) {\n\t\tthis.size += changeCount;\n\n\t\tif ( this.size >= this.limit ) {\n\t\t\tthis._reset( true );\n\t\t}\n\t}\n\n\t/**\n\t * Locks the buffer.\n\t */\n\tlock() {\n\t\tthis.isLocked = true;\n\t}\n\n\t/**\n\t * Unlocks the buffer.\n\t */\n\tunlock() {\n\t\tthis.isLocked = false;\n\t}\n\n\t/**\n\t * Destroys the buffer.\n\t */\n\tdestroy() {\n\t\tthis.model.document.off( 'change', this._changeCallback );\n\t\tthis.model.document.selection.off( 'change:range', this._selectionChangeCallback );\n\t\tthis.model.document.selection.off( 'change:attribute', this._selectionChangeCallback );\n\t}\n\n\t/**\n\t * Resets the change buffer.\n\t *\n\t * @private\n\t * @param {Boolean} [ignoreLock] Whether internal lock {@link #isLocked} should be ignored.\n\t */\n\t_reset( ignoreLock ) {\n\t\tif ( !this.isLocked || ignoreLock ) {\n\t\t\tthis._batch = null;\n\t\t\tthis.size = 0;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/inputcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport ChangeBuffer from './utils/changebuffer';\n\n/**\n * The input command. Used by the {@link module:typing/input~Input input feature} to handle typing.\n *\n * @extends module:core/command~Command\n */\nexport default class InputCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {Number} undoStepSize The maximum number of atomic changes\n\t * which can be contained in one batch in the command buffer.\n\t */\n\tconstructor( editor, undoStepSize ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * Typing's change buffer used to group subsequent changes into batches.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {module:typing/utils/changebuffer~ChangeBuffer} #_buffer\n\t\t */\n\t\tthis._buffer = new ChangeBuffer( editor.model, undoStepSize );\n\t}\n\n\t/**\n\t * The current change buffer.\n\t *\n\t * @type {module:typing/utils/changebuffer~ChangeBuffer}\n\t */\n\tget buffer() {\n\t\treturn this._buffer;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tsuper.destroy();\n\n\t\tthis._buffer.destroy();\n\t}\n\n\t/**\n\t * Executes the input command. It replaces the content within the given range with the given text.\n\t * Replacing is a two step process, first the content within the range is removed and then the new text is inserted\n\t * at the beginning of the range (which after the removal is a collapsed range).\n\t *\n\t * @fires execute\n\t * @param {Object} [options] The command options.\n\t * @param {String} [options.text=''] The text to be inserted.\n\t * @param {module:engine/model/range~Range} [options.range] The range in which the text is inserted. Defaults\n\t * to the first range in the current selection.\n\t * @param {module:engine/model/range~Range} [options.resultRange] The range where the selection\n\t * should be placed after the insertion. If not specified, the selection will be placed right after\n\t * the inserted text.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst text = options.text || '';\n\t\tconst textInsertions = text.length;\n\t\tconst range = options.range || doc.selection.getFirstRange();\n\t\tconst resultRange = options.resultRange;\n\n\t\tmodel.enqueueChange( this._buffer.batch, writer => {\n\t\t\tconst isCollapsedRange = range.isCollapsed;\n\n\t\t\tthis._buffer.lock();\n\n\t\t\tif ( !isCollapsedRange ) {\n\t\t\t\twriter.remove( range );\n\t\t\t}\n\n\t\t\tif ( text ) {\n\t\t\t\twriter.insertText( text, doc.selection.getAttributes(), range.start );\n\t\t\t}\n\n\t\t\tif ( resultRange ) {\n\t\t\t\twriter.setSelection( resultRange );\n\t\t\t} else if ( isCollapsedRange ) {\n\t\t\t\t// If range was collapsed just shift the selection by the number of inserted characters.\n\t\t\t\twriter.setSelection( range.start.getShiftedBy( textInsertions ) );\n\t\t\t}\n\n\t\t\tthis._buffer.unlock();\n\n\t\t\tthis._buffer.input( textInsertions );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/utils/injectunsafekeystrokeshandling\n */\n\nimport Selection from '@ckeditor/ckeditor5-engine/src/model/selection';\n\nimport { getCode } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Handles keystrokes which are unsafe for typing. This handler's logic is explained\n * in https://github.com/ckeditor/ckeditor5-typing/issues/83#issuecomment-398690251.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport default function injectUnsafeKeystrokesHandling( editor ) {\n\tlet latestCompositionSelection = null;\n\n\tconst model = editor.model;\n\tconst view = editor.editing.view;\n\tconst inputCommand = editor.commands.get( 'input' );\n\n\tview.document.on( 'keydown', ( evt, evtData ) => handleKeydown( evtData ), { priority: 'lowest' } );\n\n\tview.document.on( 'compositionstart', handleCompositionStart, { priority: 'lowest' } );\n\n\tview.document.on( 'compositionend', () => {\n\t\tlatestCompositionSelection = new Selection( model.document.selection );\n\t}, { priority: 'lowest' } );\n\n\t// Handles the keydown event. We need to guess whether such keystroke is going to result\n\t// in typing. If so, then before character insertion happens, any selected content needs\n\t// to be deleted. Otherwise the default browser deletion mechanism would be\n\t// triggered, resulting in:\n\t//\n\t// * Hundreds of mutations which could not be handled.\n\t// * But most importantly, loss of control over how the content is being deleted.\n\t//\n\t// The method is used in a low-priority listener, hence allowing other listeners (e.g. delete or enter features)\n\t// to handle the event.\n\t//\n\t// @param {module:engine/view/observer/keyobserver~KeyEventData} evtData\n\tfunction handleKeydown( evtData ) {\n\t\tconst doc = model.document;\n\t\tconst isComposing = view.document.isComposing;\n\t\tconst isSelectionUnchanged = latestCompositionSelection && latestCompositionSelection.isEqual( doc.selection );\n\n\t\t// Reset stored composition selection.\n\t\tlatestCompositionSelection = null;\n\n\t\t// By relying on the state of the input command we allow disabling the entire input easily\n\t\t// by just disabling the input command. We could’ve used here the delete command but that\n\t\t// would mean requiring the delete feature which would block loading one without the other.\n\t\t// We could also check the editor.isReadOnly property, but that wouldn't allow to block\n\t\t// the input without blocking other features.\n\t\tif ( !inputCommand.isEnabled ) {\n\t\t\treturn;\n\t\t}\n\n\t\tif ( isSafeKeystroke( evtData ) || doc.selection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If during composition, deletion should be prevented as it may remove composed sequence (#83).\n\t\tif ( isComposing && evtData.keyCode === 229 ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If there is a `keydown` event fired with '229' keycode it might be related\n\t\t// to recent composition. Check if selection is the same as upon ending recent composition,\n\t\t// if so do not remove selected content as it will remove composed sequence (#83).\n\t\tif ( !isComposing && evtData.keyCode === 229 && isSelectionUnchanged ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdeleteSelectionContent();\n\t}\n\n\t// Handles the `compositionstart` event. It is used only in special cases to remove the contents\n\t// of a non-collapsed selection so composition itself does not result in complex mutations.\n\t//\n\t// The special case mentioned above is a situation in which the `keydown` event is fired after\n\t// `compositionstart` event. In such cases {@link #handleKeydown} cannot clear current selection\n\t// contents (because it is too late and will break the composition) so the composition handler takes care of it.\n\tfunction handleCompositionStart() {\n\t\tconst doc = model.document;\n\t\tconst isFlatSelection = doc.selection.rangeCount === 1 ? doc.selection.getFirstRange().isFlat : true;\n\n\t\t// If on `compositionstart` there is a non-collapsed selection which start and end have different parents\n\t\t// it means the `handleKeydown()` method did not remove its contents. It happens usually because\n\t\t// of different order of events (`compositionstart` before `keydown` - in Safari). In such cases\n\t\t// we need to remove selection contents on composition start (#83).\n\t\tif ( doc.selection.isCollapsed || isFlatSelection ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdeleteSelectionContent();\n\t}\n\n\tfunction deleteSelectionContent() {\n\t\tconst buffer = inputCommand.buffer;\n\n\t\tbuffer.lock();\n\n\t\tmodel.enqueueChange( buffer.batch, () => {\n\t\t\tmodel.deleteContent( model.document.selection );\n\t\t} );\n\n\t\tbuffer.unlock();\n\t}\n}\n\nconst safeKeycodes = [\n\tgetCode( 'arrowUp' ),\n\tgetCode( 'arrowRight' ),\n\tgetCode( 'arrowDown' ),\n\tgetCode( 'arrowLeft' ),\n\t9, // Tab\n\t16, // Shift\n\t17, // Ctrl\n\t18, // Alt\n\t20, // CapsLock\n\t27, // Escape\n\t33, // PageUp\n\t34, // PageDown\n\t35, // Home\n\t36 // End\n];\n\n// Function keys.\nfor ( let code = 112; code <= 135; code++ ) {\n\tsafeKeycodes.push( code );\n}\n\n// Returns `true` if a keystroke should not cause any content change caused by \"typing\".\n//\n// Note: This implementation is very simple and will need to be refined with time.\n//\n// @private\n// @param {engine.view.observer.keyObserver.KeyEventData} keyData\n// @returns {Boolean}\nfunction isSafeKeystroke( keyData ) {\n\t// Keystrokes which contain Ctrl don't represent typing.\n\tif ( keyData.ctrlKey ) {\n\t\treturn true;\n\t}\n\n\treturn safeKeycodes.includes( keyData.keyCode );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/utils/utils\n */\n\nimport ViewText from '@ckeditor/ckeditor5-engine/src/view/text';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport diffToChanges from '@ckeditor/ckeditor5-utils/src/difftochanges';\n\n/**\n * Returns true if container children have mutated or more than a single text node was changed.\n *\n * @private\n * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n * @returns {Boolean}\n */\nexport function containerChildrenMutated( mutations ) {\n\tif ( mutations.length == 0 ) {\n\t\treturn false;\n\t}\n\n\t// Check if there is any mutation of `children` type or any mutation that changes more than one text node.\n\tfor ( const mutation of mutations ) {\n\t\tif ( mutation.type === 'children' && !getSingleTextNodeChange( mutation ) ) {\n\t\t\treturn true;\n\t\t}\n\t}\n\n\treturn false;\n}\n\n/**\n * Returns change made to a single text node.\n *\n * @private\n * @param {module:engine/view/observer/mutationobserver~MutatedText|\n * module:engine/view/observer/mutationobserver~MutatedChildren} mutation\n * @returns {Object|undefined} Change object (see {@link module:utils/difftochanges~diffToChanges} output)\n * or undefined if more than a single text node was changed.\n */\nexport function getSingleTextNodeChange( mutation ) {\n\t// One new node.\n\tif ( mutation.newChildren.length - mutation.oldChildren.length != 1 ) {\n\t\treturn;\n\t}\n\n\t// Which is text.\n\tconst diffResult = diff( mutation.oldChildren, mutation.newChildren, compareChildNodes );\n\tconst changes = diffToChanges( diffResult, mutation.newChildren );\n\n\t// In case of [ delete, insert, insert ] the previous check will not exit.\n\tif ( changes.length > 1 ) {\n\t\treturn;\n\t}\n\n\tconst change = changes[ 0 ];\n\n\t// Which is text.\n\tif ( !( change.values[ 0 ] instanceof ViewText ) ) {\n\t\treturn;\n\t}\n\n\treturn change;\n}\n\n/**\n * Checks whether two view nodes are identical, which means they are the same object\n * or contain exactly same data (in case of text nodes).\n *\n * @private\n * @param {module:engine/view/node~Node} oldChild\n * @param {module:engine/view/node~Node} newChild\n * @returns {Boolean}\n */\nexport function compareChildNodes( oldChild, newChild ) {\n\tif ( oldChild instanceof ViewText && newChild instanceof ViewText ) {\n\t\treturn oldChild.data === newChild.data;\n\t} else {\n\t\treturn oldChild === newChild;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/difftochanges\n */\n\n/**\n * Creates a set of changes which need to be applied to the input in order to transform\n * it into the output. This function can be used with strings or arrays.\n *\n *\t\tconst input = Array.from( 'abc' );\n *\t\tconst output = Array.from( 'xaby' );\n *\t\tconst changes = diffToChanges( diff( input, output ), output );\n *\n *\t\tchanges.forEach( change => {\n *\t\t\tif ( change.type == 'insert' ) {\n *\t\t\t\tinput.splice( change.index, 0, ...change.values );\n *\t\t\t} else if ( change.type == 'delete' ) {\n *\t\t\t\tinput.splice( change.index, change.howMany );\n *\t\t\t}\n *\t\t} );\n *\n *\t\tinput.join( '' ) == output.join( '' ); // -> true\n *\n * @param {Array.<'equal'|'insert'|'delete'>} diff Result of {@link module:utils/diff~diff}.\n * @param {String|Array} output The string or array which was passed as diff's output.\n * @returns {Array.<Object>} Set of changes (insert or delete) which need to be applied to the input\n * in order to transform it into the output.\n */\nexport default function diffToChanges( diff, output ) {\n\tconst changes = [];\n\tlet index = 0;\n\tlet lastOperation;\n\n\tdiff.forEach( change => {\n\t\tif ( change == 'equal' ) {\n\t\t\tpushLast();\n\n\t\t\tindex++;\n\t\t} else if ( change == 'insert' ) {\n\t\t\tif ( isContinuationOf( 'insert' ) ) {\n\t\t\t\tlastOperation.values.push( output[ index ] );\n\t\t\t} else {\n\t\t\t\tpushLast();\n\n\t\t\t\tlastOperation = {\n\t\t\t\t\ttype: 'insert',\n\t\t\t\t\tindex,\n\t\t\t\t\tvalues: [ output[ index ] ]\n\t\t\t\t};\n\t\t\t}\n\n\t\t\tindex++;\n\t\t} else /* if ( change == 'delete' ) */ {\n\t\t\tif ( isContinuationOf( 'delete' ) ) {\n\t\t\t\tlastOperation.howMany++;\n\t\t\t} else {\n\t\t\t\tpushLast();\n\n\t\t\t\tlastOperation = {\n\t\t\t\t\ttype: 'delete',\n\t\t\t\t\tindex,\n\t\t\t\t\thowMany: 1\n\t\t\t\t};\n\t\t\t}\n\t\t}\n\t} );\n\n\tpushLast();\n\n\treturn changes;\n\n\tfunction pushLast() {\n\t\tif ( lastOperation ) {\n\t\t\tchanges.push( lastOperation );\n\t\t\tlastOperation = null;\n\t\t}\n\t}\n\n\tfunction isContinuationOf( expected ) {\n\t\treturn lastOperation && lastOperation.type == expected;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/utils/injecttypingmutationshandling\n */\n\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\nimport DomConverter from '@ckeditor/ckeditor5-engine/src/view/domconverter';\n\nimport { getSingleTextNodeChange, containerChildrenMutated } from './utils';\n\n/**\n * Handles mutations caused by normal typing.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport default function injectTypingMutationsHandling( editor ) {\n\teditor.editing.view.document.on( 'mutations', ( evt, mutations, viewSelection ) => {\n\t\tnew MutationHandler( editor ).handle( mutations, viewSelection );\n\t} );\n}\n\n/**\n * Helper class for translating DOM mutations into model changes.\n *\n * @private\n */\nclass MutationHandler {\n\t/**\n\t * Creates an instance of the mutation handler.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t */\n\tconstructor( editor ) {\n\t\t/**\n\t\t * Editor instance for which mutations are handled.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:core/editor/editor~Editor} #editor\n\t\t */\n\t\tthis.editor = editor;\n\n\t\t/**\n\t\t * The editing controller.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/controller/editingcontroller~EditingController} #editing\n\t\t */\n\t\tthis.editing = this.editor.editing;\n\t}\n\n\t/**\n\t * Handles given mutations.\n\t *\n\t * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n\t * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n\t * @param {module:engine/view/selection~Selection|null} viewSelection\n\t */\n\thandle( mutations, viewSelection ) {\n\t\tif ( containerChildrenMutated( mutations ) ) {\n\t\t\tthis._handleContainerChildrenMutations( mutations, viewSelection );\n\t\t} else {\n\t\t\tfor ( const mutation of mutations ) {\n\t\t\t\t// Fortunately it will never be both.\n\t\t\t\tthis._handleTextMutation( mutation, viewSelection );\n\t\t\t\tthis._handleTextNodeInsertion( mutation );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Handles situations when container's children mutated during input. This can happen when\n\t * the browser is trying to \"fix\" DOM in certain situations. For example, when the user starts to type\n\t * in `<p><a href=\"\"><i>Link{}</i></a></p>`, the browser might change the order of elements\n\t * to `<p><i><a href=\"\">Link</a>x{}</i></p>`. A similar situation happens when the spell checker\n\t * replaces a word wrapped with `<strong>` with a word wrapped with a `<b>` element.\n\t *\n\t * To handle such situations, the common DOM ancestor of all mutations is converted to the model representation\n\t * and then compared with the current model to calculate the proper text change.\n\t *\n\t * Note: Single text node insertion is handled in {@link #_handleTextNodeInsertion} and text node mutation is handled\n\t * in {@link #_handleTextMutation}).\n\t *\n\t * @private\n\t * @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n\t * module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n\t * @param {module:engine/view/selection~Selection|null} viewSelection\n\t */\n\t_handleContainerChildrenMutations( mutations, viewSelection ) {\n\t\t// Get common ancestor of all mutations.\n\t\tconst mutationsCommonAncestor = getMutationsContainer( mutations );\n\n\t\t// Quit if there is no common ancestor.\n\t\tif ( !mutationsCommonAncestor ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domConverter = this.editor.editing.view.domConverter;\n\n\t\t// Get common ancestor in DOM.\n\t\tconst domMutationCommonAncestor = domConverter.mapViewToDom( mutationsCommonAncestor );\n\n\t\t// Create fresh DomConverter so it will not use existing mapping and convert current DOM to model.\n\t\t// This wouldn't be needed if DomConverter would allow to create fresh view without checking any mappings.\n\t\tconst freshDomConverter = new DomConverter();\n\t\tconst modelFromCurrentDom = this.editor.data.toModel(\n\t\t\tfreshDomConverter.domToView( domMutationCommonAncestor )\n\t\t).getChild( 0 );\n\n\t\t// Current model.\n\t\tconst currentModel = this.editor.editing.mapper.toModelElement( mutationsCommonAncestor );\n\n\t\t// If common ancestor is not mapped, do not do anything. It probably is a parent of another view element.\n\t\t// That means that we would need to diff model elements (see `if` below). Better return early instead of\n\t\t// trying to get a reasonable model ancestor. It will fell into the `if` below anyway.\n\t\t// This situation happens for example for lists. If `<ul>` is a common ancestor, `currentModel` is `undefined`\n\t\t// because `<ul>` is not mapped (`<li>`s are).\n\t\t// See https://github.com/ckeditor/ckeditor5/issues/718.\n\t\tif ( !currentModel ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Get children from both ancestors.\n\t\tconst modelFromDomChildren = Array.from( modelFromCurrentDom.getChildren() );\n\t\tconst currentModelChildren = Array.from( currentModel.getChildren() );\n\n\t\t// Remove the last `<softBreak>` from the end of `modelFromDomChildren` if there is no `<softBreak>` in current model.\n\t\t// If the described scenario happened, it means that this is a bogus `<br />` added by a browser.\n\t\tconst lastDomChild = modelFromDomChildren[ modelFromDomChildren.length - 1 ];\n\t\tconst lastCurrentChild = currentModelChildren[ currentModelChildren.length - 1 ];\n\n\t\tif ( lastDomChild && lastDomChild.is( 'softBreak' ) && lastCurrentChild && !lastCurrentChild.is( 'softBreak' ) ) {\n\t\t\tmodelFromDomChildren.pop();\n\t\t}\n\n\t\t// Skip situations when common ancestor has any container elements.\n\t\tif ( !isSafeForTextMutation( modelFromDomChildren ) || !isSafeForTextMutation( currentModelChildren ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Replace &nbsp; inserted by the browser with normal space. See comment in `_handleTextMutation`.\n\t\t// Replace non-texts with any character. This is potentially dangerous but passes in manual tests. The thing is\n\t\t// that we need to take care of proper indexes so we cannot simply remove non-text elements from the content.\n\t\t// By inserting a character we keep all the real texts on their indexes.\n\t\tconst newText = modelFromDomChildren.map( item => item.is( 'text' ) ? item.data : '@' ).join( '' ).replace( /\\u00A0/g, ' ' );\n\t\tconst oldText = currentModelChildren.map( item => item.is( 'text' ) ? item.data : '@' ).join( '' );\n\n\t\t// Do nothing if mutations created same text.\n\t\tif ( oldText === newText ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst diffResult = diff( oldText, newText );\n\n\t\tconst { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );\n\n\t\t// Try setting new model selection according to passed view selection.\n\t\tlet modelSelectionRange = null;\n\n\t\tif ( viewSelection ) {\n\t\t\tmodelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );\n\t\t}\n\n\t\tconst insertText = newText.substr( firstChangeAt, insertions );\n\t\tconst removeRange = ModelRange.createFromParentsAndOffsets(\n\t\t\tcurrentModel,\n\t\t\tfirstChangeAt,\n\t\t\tcurrentModel,\n\t\t\tfirstChangeAt + deletions\n\t\t);\n\n\t\tthis.editor.execute( 'input', {\n\t\t\ttext: insertText,\n\t\t\trange: removeRange,\n\t\t\tresultRange: modelSelectionRange\n\t\t} );\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_handleTextMutation( mutation, viewSelection ) {\n\t\tif ( mutation.type != 'text' ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Replace &nbsp; inserted by the browser with normal space.\n\t\t// We want only normal spaces in the model and in the view. Renderer and DOM Converter will be then responsible\n\t\t// for rendering consecutive spaces using &nbsp;, but the model and the view has to be clear.\n\t\t// Other feature may introduce inserting non-breakable space on specific key stroke (for example shift + space).\n\t\t// However then it will be handled outside of mutations, like enter key is.\n\t\t// The replacing is here because it has to be done before `diff` and `diffToChanges` functions, as they\n\t\t// take `newText` and compare it to (cleaned up) view.\n\t\t// It could also be done in mutation observer too, however if any outside plugin would like to\n\t\t// introduce additional events for mutations, they would get already cleaned up version (this may be good or not).\n\t\tconst newText = mutation.newText.replace( /\\u00A0/g, ' ' );\n\t\t// To have correct `diffResult`, we also compare view node text data with &nbsp; replaced by space.\n\t\tconst oldText = mutation.oldText.replace( /\\u00A0/g, ' ' );\n\n\t\tconst diffResult = diff( oldText, newText );\n\n\t\tconst { firstChangeAt, insertions, deletions } = calculateChanges( diffResult );\n\n\t\t// Try setting new model selection according to passed view selection.\n\t\tlet modelSelectionRange = null;\n\n\t\tif ( viewSelection ) {\n\t\t\tmodelSelectionRange = this.editing.mapper.toModelRange( viewSelection.getFirstRange() );\n\t\t}\n\n\t\t// Get the position in view and model where the changes will happen.\n\t\tconst viewPos = new ViewPosition( mutation.node, firstChangeAt );\n\t\tconst modelPos = this.editing.mapper.toModelPosition( viewPos );\n\t\tconst removeRange = ModelRange.createFromPositionAndShift( modelPos, deletions );\n\t\tconst insertText = newText.substr( firstChangeAt, insertions );\n\n\t\tthis.editor.execute( 'input', {\n\t\t\ttext: insertText,\n\t\t\trange: removeRange,\n\t\t\tresultRange: modelSelectionRange\n\t\t} );\n\t}\n\n\t/**\n\t * @private\n\t */\n\t_handleTextNodeInsertion( mutation ) {\n\t\tif ( mutation.type != 'children' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst change = getSingleTextNodeChange( mutation );\n\t\tconst viewPos = new ViewPosition( mutation.node, change.index );\n\t\tconst modelPos = this.editing.mapper.toModelPosition( viewPos );\n\t\tconst insertedText = change.values[ 0 ].data;\n\n\t\tthis.editor.execute( 'input', {\n\t\t\t// Replace &nbsp; inserted by the browser with normal space.\n\t\t\t// See comment in `_handleTextMutation`.\n\t\t\t// In this case we don't need to do this before `diff` because we diff whole nodes.\n\t\t\t// Just change &nbsp; in case there are some.\n\t\t\ttext: insertedText.replace( /\\u00A0/g, ' ' ),\n\t\t\trange: new ModelRange( modelPos )\n\t\t} );\n\t}\n}\n\n// Returns first common ancestor of all mutations that is either {@link module:engine/view/containerelement~ContainerElement}\n// or {@link module:engine/view/rootelement~RootElement}.\n//\n// @private\n// @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n// module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n// @returns {module:engine/view/containerelement~ContainerElement|engine/view/rootelement~RootElement|undefined}\nfunction getMutationsContainer( mutations ) {\n\tconst lca = mutations\n\t\t.map( mutation => mutation.node )\n\t\t.reduce( ( commonAncestor, node ) => {\n\t\t\treturn commonAncestor.getCommonAncestor( node, { includeSelf: true } );\n\t\t} );\n\n\tif ( !lca ) {\n\t\treturn;\n\t}\n\n\t// We need to look for container and root elements only, so check all LCA's\n\t// ancestors (starting from itself).\n\treturn lca.getAncestors( { includeSelf: true, parentFirst: true } )\n\t\t.find( element => element.is( 'containerElement' ) || element.is( 'rootElement' ) );\n}\n\n// Returns true if provided array contains content that won't be problematic during diffing and text mutation handling.\n//\n// @param {Array.<module:engine/model/node~Node>} children\n// @returns {Boolean}\nfunction isSafeForTextMutation( children ) {\n\treturn children.every( child => child.is( 'text' ) || child.is( 'softBreak' ) );\n}\n\n// Calculates first change index and number of characters that should be inserted and deleted starting from that index.\n//\n// @private\n// @param diffResult\n// @returns {{insertions: number, deletions: number, firstChangeAt: *}}\nfunction calculateChanges( diffResult ) {\n\t// Index where the first change happens. Used to set the position from which nodes will be removed and where will be inserted.\n\tlet firstChangeAt = null;\n\t// Index where the last change happens. Used to properly count how many characters have to be removed and inserted.\n\tlet lastChangeAt = null;\n\n\t// Get `firstChangeAt` and `lastChangeAt`.\n\tfor ( let i = 0; i < diffResult.length; i++ ) {\n\t\tconst change = diffResult[ i ];\n\n\t\tif ( change != 'equal' ) {\n\t\t\tfirstChangeAt = firstChangeAt === null ? i : firstChangeAt;\n\t\t\tlastChangeAt = i;\n\t\t}\n\t}\n\n\t// How many characters, starting from `firstChangeAt`, should be removed.\n\tlet deletions = 0;\n\t// How many characters, starting from `firstChangeAt`, should be inserted.\n\tlet insertions = 0;\n\n\tfor ( let i = firstChangeAt; i <= lastChangeAt; i++ ) {\n\t\t// If there is no change (equal) or delete, the character is existing in `oldText`. We count it for removing.\n\t\tif ( diffResult[ i ] != 'insert' ) {\n\t\t\tdeletions++;\n\t\t}\n\n\t\t// If there is no change (equal) or insert, the character is existing in `newText`. We count it for inserting.\n\t\tif ( diffResult[ i ] != 'delete' ) {\n\t\t\tinsertions++;\n\t\t}\n\t}\n\n\treturn { insertions, deletions, firstChangeAt };\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/input\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport InputCommand from './inputcommand';\n\nimport injectUnsafeKeystrokesHandling from './utils/injectunsafekeystrokeshandling';\nimport injectTypingMutationsHandling from './utils/injecttypingmutationshandling';\n\n/**\n * Handles text input coming from the keyboard or other input methods.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Input extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Input';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// TODO The above default configuration value should be defined using editor.config.define() once it's fixed.\n\t\tconst inputCommand = new InputCommand( editor, editor.config.get( 'typing.undoStep' ) || 20 );\n\n\t\teditor.commands.add( 'input', inputCommand );\n\n\t\tinjectUnsafeKeystrokesHandling( editor );\n\t\tinjectTypingMutationsHandling( editor );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/deletecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Selection from '@ckeditor/ckeditor5-engine/src/model/selection';\nimport Element from '@ckeditor/ckeditor5-engine/src/model/element';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ChangeBuffer from './utils/changebuffer';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\n\n/**\n * The delete command. Used by the {@link module:typing/delete~Delete delete feature} to handle the <kbd>Delete</kbd> and\n * <kbd>Backspace</kbd> keys.\n *\n * @extends module:core/command~Command\n */\nexport default class DeleteCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {'forward'|'backward'} direction The directionality of the delete describing in what direction it\n\t * should consume the content when the selection is collapsed.\n\t */\n\tconstructor( editor, direction ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The directionality of the delete describing in what direction it should\n\t\t * consume the content when the selection is collapsed.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'forward'|'backward'} #direction\n\t\t */\n\t\tthis.direction = direction;\n\n\t\t/**\n\t\t * Delete's change buffer used to group subsequent changes into batches.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {typing.ChangeBuffer} #buffer\n\t\t */\n\t\tthis._buffer = new ChangeBuffer( editor.model, editor.config.get( 'typing.undoStep' ) );\n\t}\n\n\t/**\n\t * Executes the delete command. Depending on whether the selection is collapsed or not, deletes its content\n\t * or a piece of content in the {@link #direction defined direction}.\n\t *\n\t * @fires execute\n\t * @param {Object} [options] The command options.\n\t * @param {'character'} [options.unit='character'] See {@link module:engine/model/utils/modifyselection~modifySelection}'s options.\n\t * @param {Number} [options.sequence=1] A number describing which subsequent delete event it is without the key being released.\n\t * See the {@link module:engine/view/document~Document#event:delete} event data.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tmodel.enqueueChange( this._buffer.batch, writer => {\n\t\t\tthis._buffer.lock();\n\n\t\t\tconst selection = new Selection( doc.selection );\n\n\t\t\t// Do not replace the whole selected content if selection was collapsed.\n\t\t\t// This prevents such situation:\n\t\t\t//\n\t\t\t// <h1></h1><p>[]</p>\t-->  <h1>[</h1><p>]</p> \t\t-->  <p></p>\n\t\t\t// starting content\t\t-->   after `modifySelection`\t-->  after `deleteContent`.\n\t\t\tconst doNotResetEntireContent = selection.isCollapsed;\n\n\t\t\t// Try to extend the selection in the specified direction.\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\tmodel.modifySelection( selection, { direction: this.direction, unit: options.unit } );\n\t\t\t}\n\n\t\t\t// Check if deleting in an empty editor. See #61.\n\t\t\tif ( this._shouldEntireContentBeReplacedWithParagraph( options.sequence || 1 ) ) {\n\t\t\t\tthis._replaceEntireContentWithParagraph( writer );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// If selection is still collapsed, then there's nothing to delete.\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tlet changeCount = 0;\n\n\t\t\tselection.getFirstRange().getMinimalFlatRanges().forEach( range => {\n\t\t\t\tchangeCount += count(\n\t\t\t\t\trange.getWalker( { singleCharacters: true, ignoreElementEnd: true, shallow: true } )\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\tmodel.deleteContent( selection, { doNotResetEntireContent } );\n\t\t\tthis._buffer.input( changeCount );\n\n\t\t\twriter.setSelection( selection );\n\n\t\t\tthis._buffer.unlock();\n\t\t} );\n\t}\n\n\t/**\n\t * If the user keeps <kbd>Backspace</kbd> or <kbd>Delete</kbd> key pressed, the content of the current\n\t * editable will be cleared. However, this will not yet lead to resetting the remaining block to a paragraph\n\t * (which happens e.g. when the user does <kbd>Ctrl</kbd> + <kbd>A</kbd>, <kbd>Backspace</kbd>).\n\t *\n\t * But, if the user pressed the key in an empty editable for the first time,\n\t * we want to replace the entire content with a paragraph if:\n\t *\n\t * * the current limit element is empty,\n\t * * the paragraph is allowed in the limit element,\n\t * * the limit doesn't already have a paragraph inside.\n\t *\n\t * See https://github.com/ckeditor/ckeditor5-typing/issues/61.\n\t *\n\t * @private\n\t * @param {Number} sequence A number describing which subsequent delete event it is without the key being released.\n\t * @returns {Boolean}\n\t */\n\t_shouldEntireContentBeReplacedWithParagraph( sequence ) {\n\t\t// Does nothing if user pressed and held the \"Backspace\" or \"Delete\" key.\n\t\tif ( sequence > 1 ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst limitElement = model.schema.getLimitElement( selection );\n\n\t\t// If a collapsed selection contains the whole content it means that the content is empty\n\t\t// (from the user perspective).\n\t\tconst limitElementIsEmpty = selection.isCollapsed && selection.containsEntireContent( limitElement );\n\n\t\tif ( !limitElementIsEmpty ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( !model.schema.checkChild( limitElement, 'paragraph' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst limitElementFirstChild = limitElement.getChild( 0 );\n\n\t\t// Does nothing if the limit element already contains only a paragraph.\n\t\t// We ignore the case when paragraph might have some inline elements (<p><inlineWidget>[]</inlineWidget></p>)\n\t\t// because we don't support such cases yet and it's unclear whether inlineWidget shouldn't be a limit itself.\n\t\tif ( limitElementFirstChild && limitElementFirstChild.name === 'paragraph' ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * The entire content is replaced with the paragraph. Selection is moved inside the paragraph.\n\t *\n\t * @private\n\t */\n\t_replaceEntireContentWithParagraph( writer ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst limitElement = model.schema.getLimitElement( selection );\n\t\tconst paragraph = new Element( 'paragraph' );\n\n\t\twriter.remove( Range.createIn( limitElement ) );\n\t\twriter.insert( paragraph, limitElement );\n\n\t\twriter.setSelection( paragraph, 0 );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/deleteobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\nimport DomEventData from '@ckeditor/ckeditor5-engine/src/view/observer/domeventdata';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport env from '@ckeditor/ckeditor5-utils/src/env';\n\n/**\n * Delete observer introduces the {@link module:engine/view/document~Document#event:delete} event.\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class DeleteObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tconst document = view.document;\n\t\tlet sequence = 0;\n\n\t\tdocument.on( 'keyup', ( evt, data ) => {\n\t\t\tif ( data.keyCode == keyCodes.delete || data.keyCode == keyCodes.backspace ) {\n\t\t\t\tsequence = 0;\n\t\t\t}\n\t\t} );\n\n\t\tdocument.on( 'keydown', ( evt, data ) => {\n\t\t\tconst deleteData = {};\n\n\t\t\tif ( data.keyCode == keyCodes.delete ) {\n\t\t\t\tdeleteData.direction = 'forward';\n\t\t\t\tdeleteData.unit = 'character';\n\t\t\t} else if ( data.keyCode == keyCodes.backspace ) {\n\t\t\t\tdeleteData.direction = 'backward';\n\t\t\t\tdeleteData.unit = 'codePoint';\n\t\t\t} else {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst hasWordModifier = env.isMac ? data.altKey : data.ctrlKey;\n\t\t\tdeleteData.unit = hasWordModifier ? 'word' : deleteData.unit;\n\t\t\tdeleteData.sequence = ++sequence;\n\n\t\t\t// Save the event object to check later if it was stopped or not.\n\t\t\tlet event;\n\t\t\tdocument.once( 'delete', evt => ( event = evt ), { priority: 'highest' } );\n\n\t\t\tdocument.fire( 'delete', new DomEventData( document, data.domEvent, deleteData ) );\n\n\t\t\t// Stop `keydown` event if `delete` event was stopped.\n\t\t\t// https://github.com/ckeditor/ckeditor5/issues/753\n\t\t\tif ( event && event.stop.called ) {\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve() {}\n}\n\n/**\n * Event fired when the user tries to delete content (e.g. presses <kbd>Delete</kbd> or <kbd>Backspace</kbd>).\n *\n * Note: This event is fired by the {@link module:typing/deleteobserver~DeleteObserver observer}\n * (usually registered by the {@link module:typing/delete~Delete delete feature}).\n *\n * @event module:engine/view/document~Document#event:delete\n * @param {module:engine/view/observer/domeventdata~DomEventData} data\n * @param {'forward'|'delete'} data.direction The direction in which the deletion should happen.\n * @param {'character'|'word'} data.unit The \"amount\" of content that should be deleted.\n * @param {Number} data.sequence A number describing which subsequent delete event it is without the key being released.\n * If it's 2 or more it means that the key was pressed and hold.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/utils/injectandroidbackspacenutationshandling\n */\n\nimport Selection from '@ckeditor/ckeditor5-engine/src/model/selection';\nimport diff from '@ckeditor/ckeditor5-utils/src/diff';\n\nimport { containerChildrenMutated } from './utils';\n\n/**\n * Handles mutations triggered by <kbd>Backspace</kbd> on Android.\n * Due to the fact that on Android `keydown` events don't have the `keyCode` set, we are not able\n * to handle backspacing directly. We need to guess that from mutations which the IME\n * on Android caused.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport default function injectAndroidBackspaceMutationsHandling( editor ) {\n\tconst model = editor.model;\n\tconst view = editor.editing.view;\n\tconst selectionChangeToleranceMs = 200;\n\n\tlet previousSelection = null;\n\tlet currentSelection = new Selection( model.document.selection );\n\tlet latestSelectionChangeMs = Date.now();\n\n\tmodel.document.selection.on( 'change', handleSelectionChange );\n\n\tview.document.on( 'mutations', handleMutations, { priority: 'highest' } );\n\n\t// Saves current and previous selection when it changes. Saved selections are used\n\t// to remove correct piece of content when `Backspace` mutations are detected.\n\t//\n\t// @param {Object} evt\n\tfunction handleSelectionChange( evt ) {\n\t\tconst newSelection = new Selection( evt.source );\n\t\tif ( !currentSelection.isEqual( newSelection ) ) {\n\t\t\tpreviousSelection = currentSelection;\n\t\t\tcurrentSelection = newSelection;\n\t\t\tlatestSelectionChangeMs = Date.now();\n\t\t}\n\t}\n\n\t// Handles DOM mutations and checks if they should be processed as block elements removal mutations.\n\t//\n\t// @param {Object} evt\n\t// @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n\t// module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n\tfunction handleMutations( evt, mutations ) {\n\t\tif ( containerChildrenMutated( mutations ) && containsContainersRemoval( mutations ) ) {\n\t\t\thandleContainerRemovalMutations();\n\n\t\t\t// Stop mutations event propagation so other mutation handlers are not triggered.\n\t\t\tevt.stop();\n\t\t}\n\t}\n\n\t// Handles situations when mutations were generated by container removal.\n\t// It happens on Android devices where every typing input has `229` key code\n\t// and delete observer will not be triggered. In such cases we need to handle\n\t// container removal mutations manually.\n\tfunction handleContainerRemovalMutations() {\n\t\tif ( shouldUsePreviousSelection() ) {\n\t\t\t// If previous selection is used, update model selection in order\n\t\t\t// to use `delete` command and to make `undo` work correctly.\n\t\t\tmodel.enqueueChange( writer => {\n\t\t\t\twriter.setSelection( previousSelection );\n\t\t\t} );\n\t\t}\n\n\t\teditor.execute( 'delete' );\n\t}\n\n\t// Whether previously saved selection should be used instead of the current one to remove content.\n\t//\n\t// On Android devices when pressing backspace on non-collapsed selection, selection like:\n\t//\n\t//\t\t`<h1>[Foo</h1><p>Bar]</p>`\n\t//\n\t// is changed to:\n\t//\n\t//\t\t`<h1>Foo</h1><p>Bar[]</p>`\n\t//\n\t// even before `keypress` event, so in such cases we have to rely on previous selection to correctly process selected content.\n\t//\n\t// Previous selection will be used if:\n\t//\n\t//\t\t* current selection is collapsed (see example above),\n\t//\t\t* previous selection exists, is non-collapsed and has same ending (last position) as the current one,\n\t//\t\t* change of the selection happened not earlier than X milliseconds ago (see `selectionChangeToleranceMs`).\n\t//\n\t// The last check is needed, because user can manually collapse the selection on its current end and then press `Backspace`.\n\t// In such situations timing determines if the selection change was caused by the user or browser native behaviour.\n\t// However, this happens only if selection was collapsed by the user on the beginning of the paragraph (so mutations\n\t// still will show container removal).\n\t//\n\t// @returns {Boolean}\n\tfunction shouldUsePreviousSelection() {\n\t\treturn Date.now() - latestSelectionChangeMs < selectionChangeToleranceMs &&\n\t\t\tpreviousSelection && !previousSelection.isCollapsed && currentSelection.isCollapsed &&\n\t\t\tcurrentSelection.getLastPosition().isEqual( previousSelection.getLastPosition() );\n\t}\n}\n\n// Checks whether mutations array contains mutation generated by container/containers removal.\n// For example mutations generated on Android when pressing `backspace` on the beginning of the line:\n//\n//\t\t<h1>Header1</h1>\n//\t\t<p>{}Paragraph</p>\n//\n// are:\n//\n//\t\t[\n//\t\t\t{ newChildren: [], oldChildren: [ 'Paragraph' ], node: P, type: 'children' },\n//\t\t\t{ newChildren: [ ContainerElement ], oldChildren: [ ContainerElement, ContainerElement ], node: Root, type: 'children' },\n//\t\t\t{ newChildren: [ 'Heading 1Paragraph' ], oldChildren: [ 'Heading 1' ], node: H1, type: 'children' }\n//\t\t]\n//\n// The 1st and 3rd mutations are just changes in a text (1st - text in `p` element was removed, 3rd - text in `h2` was changed)\n// and the 2nd one shows that one `ContainerElement` was removed. We have to recognize if mutations like 2nd one are present.\n// Based on that heuristic mutations are treated as the one removing container element.\n//\n// @private\n// @param {Array.<module:engine/view/observer/mutationobserver~MutatedText|\n// module:engine/view/observer/mutationobserver~MutatedChildren>} mutations\n// @returns {Boolean}\nfunction containsContainersRemoval( mutations ) {\n\tfor ( const mutation of mutations ) {\n\t\tif ( mutation.type !== 'children' ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst childrenBefore = mutation.oldChildren;\n\t\tconst childrenAfter = mutation.newChildren;\n\n\t\t// Check if only containers were present before the mutation.\n\t\tif ( !hasOnlyContainers( childrenBefore ) ) {\n\t\t\tcontinue;\n\t\t}\n\n\t\tconst diffResult = diff( childrenBefore, childrenAfter );\n\n\t\t// Check if there was only removing in that mutation without any insertions.\n\t\tconst hasDelete = diffResult.some( item => item === 'delete' );\n\t\tconst hasInsert = diffResult.some( item => item === 'insert' );\n\n\t\tif ( hasDelete && !hasInsert ) {\n\t\t\treturn true;\n\t\t}\n\t}\n\n\treturn false;\n}\n\n// Whether provided array contains only nodes of `containerElement` type.\n//\n// @private\n// @param {Array.<module:engine/view/node~Node>} children\n// @returns {Boolean}\nfunction hasOnlyContainers( children ) {\n\treturn children.every( child => child.is( 'containerElement' ) );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/delete\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport DeleteCommand from './deletecommand';\nimport DeleteObserver from './deleteobserver';\n\nimport injectAndroidBackspaceMutationsHandling from './utils/injectandroidbackspacemutationshandling';\n\n/**\n * The delete and backspace feature. Handles the <kbd>Delete</kbd> and <kbd>Backspace</kbd> keys in the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Delete extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Delete';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\n\t\tview.addObserver( DeleteObserver );\n\n\t\teditor.commands.add( 'forwardDelete', new DeleteCommand( editor, 'forward' ) );\n\t\teditor.commands.add( 'delete', new DeleteCommand( editor, 'backward' ) );\n\n\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\teditor.execute( data.direction == 'forward' ? 'forwardDelete' : 'delete', { unit: data.unit, sequence: data.sequence } );\n\t\t\tdata.preventDefault();\n\t\t\tview.scrollToTheSelection();\n\t\t} );\n\n\t\tinjectAndroidBackspaceMutationsHandling( editor );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module typing/typing\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Input from './input';\nimport Delete from './delete';\n\n/**\n * The typing feature. It handles typing.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Typing extends Plugin {\n\tstatic get requires() {\n\t\treturn [ Input, Delete ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Typing';\n\t}\n}\n\n/**\n * The configuration of the typing features. Used by the features from the `@ckeditor/ckeditor5-typing` package.\n *\n * Read more in {@link module:typing/typing~TypingConfig}.\n *\n * @member {module:typing/typing~TypingConfig} module:core/editor/editorconfig~EditorConfig#typing\n */\n\n/**\n * The configuration of the typing features. Used by the typing features in `@ckeditor/ckeditor5-typing` package.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\ttyping: ... // Typing feature options.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface TypingConfig\n */\n\n/**\n * The granularity of undo/redo for typing and deleting. The value `20` means (more or less) that a new undo step\n * is created every 20 characters are inserted or deleted.\n *\n * @member {Number} [module:typing/typing~TypingConfig#undoStep=20]\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module undo/basecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * Base class for undo feature commands: {@link module:undo/undocommand~UndoCommand} and {@link module:undo/redocommand~RedoCommand}.\n *\n * @protected\n * @extends module:core/command~Command\n */\nexport default class BaseCommand extends Command {\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * Stack of items stored by the command. These are pairs of:\n\t\t *\n\t\t * * {@link module:engine/model/batch~Batch batch} saved by the command,\n\t\t * * {@link module:engine/model/selection~Selection selection} state at the moment of saving the batch.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array} #_stack\n\t\t */\n\t\tthis._stack = [];\n\n\t\t/**\n\t\t * Stores all batches that were created by this command.\n\t\t *\n\t\t * @protected\n\t\t * @member {WeakSet.<module:engine/model/batch~Batch>} #_createdBatches\n\t\t */\n\t\tthis._createdBatches = new WeakSet();\n\n\t\t// Refresh state, so the command is inactive right after initialization.\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.isEnabled = this._stack.length > 0;\n\t}\n\n\t/**\n\t * Stores a batch in the command, together with the selection state of the {@link module:engine/model/document~Document document}\n\t * created by the editor which this command is registered to.\n\t *\n\t * @param {module:engine/model/batch~Batch} batch The batch to add.\n\t */\n\taddBatch( batch ) {\n\t\tconst docSelection = this.editor.model.document.selection;\n\n\t\tconst selection = {\n\t\t\tranges: docSelection.hasOwnRange ? Array.from( docSelection.getRanges() ) : [],\n\t\t\tisBackward: docSelection.isBackward\n\t\t};\n\n\t\tthis._stack.push( { batch, selection } );\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * Removes all items from the stack.\n\t */\n\tclearStack() {\n\t\tthis._stack = [];\n\t\tthis.refresh();\n\t}\n\n\t/**\n\t * Restores the {@link module:engine/model/document~Document#selection document selection} state after a batch was undone.\n\t *\n\t * @protected\n\t * @param {Array.<module:engine/model/range~Range>} ranges Ranges to be restored.\n\t * @param {Boolean} isBackward A flag describing whether the restored range was selected forward or backward.\n\t * @param {Array.<module:engine/model/delta/delta~Delta>} deltas Deltas which has been applied since selection has been stored.\n\t */\n\t_restoreSelection( ranges, isBackward, deltas ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\t// This will keep the transformed selection ranges.\n\t\tconst selectionRanges = [];\n\n\t\t// Transform all ranges from the restored selection.\n\t\tfor ( const range of ranges ) {\n\t\t\tconst transformedRanges = transformSelectionRange( range, deltas );\n\n\t\t\t// For each `range` from `ranges`, we take only one transformed range.\n\t\t\t// This is because we want to prevent situation where single-range selection\n\t\t\t// got transformed to multi-range selection. We will take the first range that\n\t\t\t// is not in the graveyard.\n\t\t\tconst transformedRange = transformedRanges.find(\n\t\t\t\trange => range.start.root != document.graveyard\n\t\t\t);\n\n\t\t\t// `transformedRange` might be `undefined` if transformed range ended up in graveyard.\n\t\t\tif ( transformedRange ) {\n\t\t\t\tselectionRanges.push( transformedRange );\n\t\t\t}\n\t\t}\n\n\t\t// `selectionRanges` may be empty if all ranges ended up in graveyard. If that is the case, do not restore selection.\n\t\tif ( selectionRanges.length ) {\n\t\t\tmodel.change( writer => {\n\t\t\t\twriter.setSelection( selectionRanges, { backward: isBackward } );\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Undoes a batch by reversing that batch, transforming reversed batch and finally applying it.\n\t * This is a helper method for {@link #execute}.\n\t *\n\t * @protected\n\t * @param {module:engine/model/batch~Batch} batchToUndo The batch to be undone.\n\t * @param {module:engine/model/batch~Batch} undoingBatch The batch that will contain undoing changes.\n\t */\n\t_undo( batchToUndo, undoingBatch ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\t// All changes done by the command execution will be saved as one batch.\n\t\tthis._createdBatches.add( undoingBatch );\n\n\t\tconst deltasToUndo = batchToUndo.deltas.slice();\n\t\tdeltasToUndo.reverse();\n\n\t\t// We will process each delta from `batchToUndo`, in reverse order. If there were deltas A, B and C in undone batch,\n\t\t// we need to revert them in reverse order, so first C' (reversed C), then B', then A'.\n\t\tfor ( const deltaToUndo of deltasToUndo ) {\n\t\t\t// For now let's skip deltas with operation applied on detached document.\n\t\t\t// We assumed that there is no deltas with mixed (document and document fragment) operations\n\t\t\t// so we can skip entire delta.\n\t\t\tif ( deltaToUndo.operations.some( op => op.isDocumentOperation ) ) {\n\t\t\t\t// Keep in mind that transformation algorithms return arrays. That's because the transformation might result in multiple\n\t\t\t\t// deltas, so we need arrays to handle them. To simplify algorithms, it is better to always operate on arrays.\n\t\t\t\tconst nextBaseVersion = deltaToUndo.baseVersion + deltaToUndo.operations.length;\n\n\t\t\t\t// Reverse delta from the history.\n\t\t\t\tconst historyDeltas = Array.from( document.history.getDeltas( nextBaseVersion ) );\n\t\t\t\tconst transformedSets = model.transformDeltas( [ deltaToUndo.getReversed() ], historyDeltas, true );\n\t\t\t\tconst reversedDeltas = transformedSets.deltasA;\n\n\t\t\t\t// After reversed delta has been transformed by all history deltas, apply it.\n\t\t\t\tfor ( const delta of reversedDeltas ) {\n\t\t\t\t\t// Fix base version.\n\t\t\t\t\tdelta.baseVersion = document.version;\n\n\t\t\t\t\t// Before applying, add the delta to the `undoingBatch`.\n\t\t\t\t\tundoingBatch.addDelta( delta );\n\n\t\t\t\t\t// Now, apply all operations of the delta.\n\t\t\t\t\tfor ( const operation of delta.operations ) {\n\t\t\t\t\t\tmodel.applyOperation( operation );\n\t\t\t\t\t}\n\n\t\t\t\t\tdocument.history.setDeltaAsUndone( deltaToUndo, delta );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Transforms given range `range` by given `deltas`.\n// Returns an array containing one or more ranges, which are result of the transformation.\nfunction transformSelectionRange( range, deltas ) {\n\tconst transformed = transformRangesByDeltas( [ range ], deltas );\n\n\t// After `range` got transformed, we have an array of ranges. Some of those\n\t// ranges may be \"touching\" -- they can be next to each other and could be merged.\n\t// First, we have to sort those ranges to assure that they are in order.\n\ttransformed.sort( ( a, b ) => a.start.isBefore( b.start ) ? -1 : 1 );\n\n\t// Then, we check if two consecutive ranges are touching.\n\tfor ( let i = 1; i < transformed.length; i++ ) {\n\t\tconst a = transformed[ i - 1 ];\n\t\tconst b = transformed[ i ];\n\n\t\tif ( a.end.isTouching( b.start ) ) {\n\t\t\t// And join them together if they are.\n\t\t\ta.end = b.end;\n\t\t\ttransformed.splice( i, 1 );\n\t\t\ti--;\n\t\t}\n\t}\n\n\treturn transformed;\n}\n\n// Transforms given set of `ranges` by given set of `deltas`. Returns transformed `ranges`.\nexport function transformRangesByDeltas( ranges, deltas ) {\n\tfor ( const delta of deltas ) {\n\t\tfor ( const operation of delta.operations ) {\n\t\t\t// We look through all operations from all deltas.\n\n\t\t\tfor ( let i = 0; i < ranges.length; i++ ) {\n\t\t\t\t// We transform every range by every operation.\n\t\t\t\tlet result;\n\n\t\t\t\tswitch ( operation.type ) {\n\t\t\t\t\tcase 'insert':\n\t\t\t\t\t\tresult = ranges[ i ]._getTransformedByInsertion(\n\t\t\t\t\t\t\toperation.position,\n\t\t\t\t\t\t\toperation.nodes.maxOffset,\n\t\t\t\t\t\t\ttrue\n\t\t\t\t\t\t);\n\t\t\t\t\t\tbreak;\n\n\t\t\t\t\tcase 'move':\n\t\t\t\t\tcase 'remove':\n\t\t\t\t\tcase 'reinsert':\n\t\t\t\t\t\tresult = ranges[ i ]._getTransformedByMove(\n\t\t\t\t\t\t\toperation.sourcePosition,\n\t\t\t\t\t\t\toperation.targetPosition,\n\t\t\t\t\t\t\toperation.howMany,\n\t\t\t\t\t\t\ttrue\n\t\t\t\t\t\t);\n\t\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\t// If we have a transformation result, we substitute transformed range with it in `transformed` array.\n\t\t\t\t// Keep in mind that the result is an array and may contain multiple ranges.\n\t\t\t\tif ( result ) {\n\t\t\t\t\tranges.splice( i, 1, ...result );\n\n\t\t\t\t\t// Fix iterator.\n\t\t\t\t\ti = i + result.length - 1;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\treturn ranges;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module undo/undocommand\n */\n\nimport BaseCommand from './basecommand';\nimport Batch from '@ckeditor/ckeditor5-engine/src/model/batch';\n\n/**\n * The undo command stores {@link module:engine/model/batch~Batch batches} applied to the\n * {@link module:engine/model/document~Document document} and is able to undo a batch by reversing it and transforming by\n * batches from {@link module:engine/model/document~Document#history history} that happened after the reversed batch.\n *\n * The undo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.\n *\n * @extends module:undo/basecommand~BaseCommand\n */\nexport default class UndoCommand extends BaseCommand {\n\t/**\n\t * Executes the command. This method reverts a {@link module:engine/model/batch~Batch batch} added to the command's stack, transforms\n\t * and applies the reverted version on the {@link module:engine/model/document~Document document} and removes the batch from the stack.\n\t * Then, it restores the {@link module:engine/model/document~Document#selection document selection}.\n\t *\n\t * @fires execute\n\t * @fires revert\n\t * @param {module:engine/model/batch~Batch} [batch] A batch that should be undone. If not set, the last added batch will be undone.\n\t */\n\texecute( batch = null ) {\n\t\t// If batch is not given, set `batchIndex` to the last index in command stack.\n\t\tconst batchIndex = batch ? this._stack.findIndex( a => a.batch == batch ) : this._stack.length - 1;\n\n\t\tconst item = this._stack.splice( batchIndex, 1 )[ 0 ];\n\t\tconst undoingBatch = new Batch();\n\n\t\t// All changes has to be done in one `enqueueChange` callback so other listeners will not\n\t\t// step between consecutive deltas, or won't do changes to the document before selection is properly restored.\n\t\tthis.editor.model.enqueueChange( undoingBatch, () => {\n\t\t\tthis._undo( item.batch, undoingBatch );\n\n\t\t\tconst deltas = this.editor.model.document.history.getDeltas( item.batch.baseVersion );\n\t\t\tthis._restoreSelection( item.selection.ranges, item.selection.isBackward, deltas );\n\n\t\t\tthis.fire( 'revert', item.batch, undoingBatch );\n\t\t} );\n\n\t\tthis.refresh();\n\t}\n}\n\n/**\n * Fired when execution of the command reverts some batch.\n *\n * @event revert\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module undo/redocommand\n */\n\nimport BaseCommand from './basecommand';\nimport Batch from '@ckeditor/ckeditor5-engine/src/model/batch';\n\n/**\n * The redo command stores {@link module:engine/model/batch~Batch batches} that were used to undo a batch by\n * {@link module:undo/undocommand~UndoCommand}. It is able to redo a previously undone batch by reversing the undoing\n * batches created by `UndoCommand`. The reversed batch is transformed by all the batches from\n * {@link module:engine/model/document~Document#history history} that happened after the reversed undo batch.\n *\n * The redo command also takes care of restoring the {@link module:engine/model/document~Document#selection document selection}.\n *\n * @extends module:undo/basecommand~BaseCommand\n */\nexport default class RedoCommand extends BaseCommand {\n\t/**\n\t * Executes the command. This method reverts the last {@link module:engine/model/batch~Batch batch} added to\n\t * the command's stack, applies the reverted and transformed version on the\n\t * {@link module:engine/model/document~Document document} and removes the batch from the stack.\n\t * Then, it restores the {@link module:engine/model/document~Document#selection document selection}.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst item = this._stack.pop();\n\t\tconst redoingBatch = new Batch();\n\n\t\t// All changes have to be done in one `enqueueChange` callback so other listeners will not\n\t\t// step between consecutive deltas, or won't do changes to the document before selection is properly restored.\n\t\tthis.editor.model.enqueueChange( redoingBatch, () => {\n\t\t\tconst lastDelta = item.batch.deltas[ item.batch.deltas.length - 1 ];\n\t\t\tconst nextBaseVersion = lastDelta.baseVersion + lastDelta.operations.length;\n\t\t\tconst deltas = this.editor.model.document.history.getDeltas( nextBaseVersion );\n\n\t\t\tthis._restoreSelection( item.selection.ranges, item.selection.isBackward, deltas );\n\t\t\tthis._undo( item.batch, redoingBatch );\n\t\t} );\n\n\t\tthis.refresh();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module undo/undoediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport UndoCommand from './undocommand';\nimport RedoCommand from './redocommand';\n\n/**\n * The undo engine feature.\n *\n * Undo brings in possibility to undo and redo changes done in the model by deltas through\n * the {@link module:engine/model/writer~Writer Writer API}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class UndoEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The command that manages undo {@link module:engine/model/batch~Batch batches} stack (history).\n\t\t * Created and registered during the {@link #init feature initialization}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:undo/undocommand~UndoCommand} #_undoCommand\n\t\t */\n\n\t\t/**\n\t\t * The command that manages redo {@link module:engine/model/batch~Batch batches} stack (history).\n\t\t * Created and registered during the {@link #init feature initialization}.\n\t\t *\n\t\t * @private\n\t\t * @member {module:undo/undocommand~UndoCommand} #_redoCommand\n\t\t */\n\n\t\t/**\n\t\t * Keeps track of which batches were registered in undo.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakSet.<module:engine/model/batch~Batch>}\n\t\t */\n\t\tthis._batchRegistry = new WeakSet();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Create commands.\n\t\tthis._undoCommand = new UndoCommand( editor );\n\t\tthis._redoCommand = new RedoCommand( editor );\n\n\t\t// Register command to the editor.\n\t\teditor.commands.add( 'undo', this._undoCommand );\n\t\teditor.commands.add( 'redo', this._redoCommand );\n\n\t\tthis.listenTo( editor.model, 'applyOperation', ( evt, args ) => {\n\t\t\tconst operation = args[ 0 ];\n\n\t\t\t// Do not register batch if the operation is not a document operation.\n\t\t\t// This prevents from creating empty undo steps, where all operations where non-document operations.\n\t\t\t// Non-document operations creates and alters content in detached tree fragments (for example, document fragments).\n\t\t\t// Most of time this is preparing data before it is inserted into actual tree (for example during copy & paste).\n\t\t\t// Such operations should not be reversed.\n\t\t\tif ( !operation.isDocumentOperation ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst batch = operation.delta.batch;\n\n\t\t\t// If changes are not a part of a batch or this is not a new batch, omit those changes.\n\t\t\tif ( this._batchRegistry.has( batch ) || batch.type == 'transparent' ) {\n\t\t\t\treturn;\n\t\t\t} else {\n\t\t\t\tif ( this._redoCommand._createdBatches.has( batch ) ) {\n\t\t\t\t\t// If this batch comes from `redoCommand`, add it to `undoCommand` stack.\n\t\t\t\t\tthis._undoCommand.addBatch( batch );\n\t\t\t\t} else if ( !this._undoCommand._createdBatches.has( batch ) ) {\n\t\t\t\t\t// A default batch - these are new changes in the document, not introduced by undo feature.\n\t\t\t\t\t// Add them to `undoCommand` stack and clear `redoCommand` stack.\n\t\t\t\t\tthis._undoCommand.addBatch( batch );\n\t\t\t\t\tthis._redoCommand.clearStack();\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Add the batch to the registry so it will not be processed again.\n\t\t\tthis._batchRegistry.add( batch );\n\t\t}, { priority: 'highest' } );\n\n\t\tthis.listenTo( this._undoCommand, 'revert', ( evt, undoneBatch, undoingBatch ) => {\n\t\t\tthis._redoCommand.addBatch( undoingBatch );\n\t\t} );\n\n\t\teditor.keystrokes.set( 'CTRL+Z', 'undo' );\n\t\teditor.keystrokes.set( 'CTRL+Y', 'redo' );\n\t\teditor.keystrokes.set( 'CTRL+SHIFT+Z', 'redo' );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module undo/undoui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport undoIcon from '../theme/icons/undo.svg';\nimport redoIcon from '../theme/icons/redo.svg';\n/**\n * The undo UI feature. It introduces the Undo and Redo buttons to the editor.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class UndoUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        this._addButton('undo', t('ai'), 'CTRL+Z', undoIcon);\n        this._addButton('redo', t('aj'), 'CTRL+Y', redoIcon);\n    }\n    /**\n\t * Creates a button for the specified command.\n\t *\n\t * @private\n\t * @param {String} name Command name.\n\t * @param {String} label Button label.\n\t * @param {String} keystroke Command keystroke.\n\t * @param {String} Icon Source of the icon.\n\t */\n    _addButton(name, label, keystroke, Icon) {\n        const editor = this.editor;\n        editor.ui.componentFactory.add(name, locale => {\n            const command = editor.commands.get(name);\n            const view = new ButtonView(locale);\n            view.set({\n                label,\n                icon: Icon,\n                keystroke,\n                tooltip: true\n            });\n            view.bind('isEnabled').to(command, 'isEnabled');\n            this.listenTo(view, 'execute', () => editor.execute(name));\n            return view;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module undo/undo\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport UndoEditing from './undoediting';\nimport UndoUI from './undoui';\n\n/**\n * The undo feature.\n *\n * It loads the {@link module:undo/undoediting~UndoEditing undo editing feature}\n * and {@link module:undo/undoui~UndoUI undo UI feature}.\n *\n * Below is the explanation of the undo mechanism working together with {@link module:engine/model/history~History History}:\n *\n * Whenever a {@link module:engine/model/delta/delta~Delta delta} is applied to the\n * {@link module:engine/model/document~Document document}, it is saved to `History` as is.\n * The {@link module:engine/model/batch~Batch batch} that owns that delta is also saved, in\n * {@link module:undo/undocommand~UndoCommand}, together with the selection that was present in the document before the\n * delta was applied. A batch is saved instead of the delta because changes are undone batch-by-batch, not delta-by-delta\n * and a batch is seen as one undo step.\n *\n * After some changes happen to the document, the `History` and `UndoCommand` stack can be represented as follows:\n *\n *\t\t  History                           Undo stack\n *\t\t===========             ==================================\n *\t\t[delta A1]                          [batch A]\n *\t\t[delta B1]                          [batch B]\n *\t\t[delta B2]                          [batch C]\n *\t\t[delta C1]\n *\t\t[delta C2]\n *\t\t[delta B3]\n *\t\t[delta C3]\n *\n * Where deltas starting with the same letter are from same batch.\n *\n * Undoing a batch means that a set of deltas which will reverse the effects of that batch needs to be generated. For example, if a batch\n * added several letters, undoing the batch should remove them. It is important to apply undoing deltas in the reversed order,\n * so if a batch has delta `X`, `Y`, `Z`, reversed deltas `Zr`, `Yr` and `Xr` need to be applied. Otherwise reversed delta\n * `Xr` would operate on a wrong document state, because delta `X` does not know that deltas `Y` and `Z` happened.\n *\n * After deltas from an undone batch got {@link module:engine/model/delta/delta~Delta#getReversed reversed},\n * one needs to make sure if they are ready to be applied. In the scenario above, delta `C3` is the last delta and `C3r`\n * bases on up-to-date document state, so it can be applied to the document.\n *\n *\t\t  History                           Undo stack\n *\t\t=============             ==================================\n *\t\t[ delta A1  ]                      [  batch A  ]\n *\t\t[ delta B1  ]                      [  batch B  ]\n *\t\t[ delta B2  ]             [   processing undoing batch C   ]\n *\t\t[ delta C1  ]\n *\t\t[ delta C2  ]\n *\t\t[ delta B3  ]\n *\t\t[ delta C3  ]\n *\t\t[ delta C3r ]\n *\n * Next is delta `C2`, reversed to `C2r`. `C2r` bases on `C2`, so it bases on the wrong document state. It needs to be\n * transformed by deltas from history that happened after it, so it \"knows\" about them. Let us assume that `C2' = C2r * B3 * C3 * C3r`,\n * where `*` means \"transformed by\". Rest of deltas from that batch are processed in the same fashion.\n *\n *\t\t  History                           Undo stack                                     Redo stack\n *\t\t=============             ==================================             ==================================\n *\t\t[ delta A1  ]                      [  batch A  ]                                  [ batch Cr ]\n *\t\t[ delta B1  ]                      [  batch B  ]\n *\t\t[ delta B2  ]\n *\t\t[ delta C1  ]\n *\t\t[ delta C2  ]\n *\t\t[ delta B3  ]\n *\t\t[ delta C3  ]\n *\t\t[ delta C3r ]\n *\t\t[ delta C2' ]\n *\t\t[ delta C1' ]\n *\n * Selective undo works on the same basis, however, instead of undoing the last batch in the undo stack, any batch can be undone.\n * The same algorithm applies: deltas from a batch (i.e. `A1`) are reversed and then transformed by deltas stored in history.\n *\n * Redo also is very similar to undo. It has its own stack that is filled with undoing (reversed batches). Deltas from\n * batch that is re-done are reversed-back, transformed in proper order and applied to the document.\n *\n *\t\t  History                           Undo stack                                     Redo stack\n *\t\t=============             ==================================             ==================================\n *\t\t[ delta A1  ]                      [  batch A  ]\n *\t\t[ delta B1  ]                      [  batch B  ]\n *\t\t[ delta B2  ]                      [ batch Crr ]\n *\t\t[ delta C1  ]\n *\t\t[ delta C2  ]\n *\t\t[ delta B3  ]\n *\t\t[ delta C3  ]\n *\t\t[ delta C3r ]\n *\t\t[ delta C2' ]\n *\t\t[ delta C1' ]\n *\t\t[ delta C1'r]\n *\t\t[ delta C2'r]\n *\t\t[ delta C3rr]\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Undo extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ UndoEditing, UndoUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Undo';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window, document */\n\n/**\n * @module adapter-ckfinder/utils\n */\n\nconst TOKEN_COOKIE_NAME = 'ckCsrfToken';\nconst TOKEN_LENGTH = 40;\nconst tokenCharset = 'abcdefghijklmnopqrstuvwxyz0123456789';\n\n/**\n * Returns the CSRF token value. The value is a hash stored in `document.cookie`\n * under the `ckCsrfToken` key. The CSRF token can be used to secure the communication\n * between the web browser and the CKFinder server.\n *\n * @returns {String}\n */\nexport function getCsrfToken() {\n\tlet token = getCookie( TOKEN_COOKIE_NAME );\n\n\tif ( !token || token.length != TOKEN_LENGTH ) {\n\t\ttoken = generateToken( TOKEN_LENGTH );\n\t\tsetCookie( TOKEN_COOKIE_NAME, token );\n\t}\n\n\treturn token;\n}\n\n/**\n * Returns the value of the cookie with a given name or `null` if the cookie is not found.\n *\n * @param {String} name\n * @returns {String|null}\n */\nexport function getCookie( name ) {\n\tname = name.toLowerCase();\n\tconst parts = document.cookie.split( ';' );\n\n\tfor ( const part of parts ) {\n\t\tconst pair = part.split( '=' );\n\t\tconst key = decodeURIComponent( pair[ 0 ].trim().toLowerCase() );\n\n\t\tif ( key === name ) {\n\t\t\treturn decodeURIComponent( pair[ 1 ] );\n\t\t}\n\t}\n\n\treturn null;\n}\n\n/**\n * Sets the value of the cookie with a given name.\n *\n * @param {String} name\n * @param {String} value\n */\nexport function setCookie( name, value ) {\n\tdocument.cookie = encodeURIComponent( name ) + '=' + encodeURIComponent( value ) + ';path=/';\n}\n\n// Generates the CSRF token with the given length.\n//\n// @private\n// @param {Number} length\n// @returns {string}\nfunction generateToken( length ) {\n\tlet result = '';\n\tconst randValues = new Uint8Array( length );\n\n\twindow.crypto.getRandomValues( randValues );\n\n\tfor ( let j = 0; j < randValues.length; j++ ) {\n\t\tconst character = tokenCharset.charAt( randValues[ j ] % tokenCharset.length );\n\t\tresult += Math.random() > 0.5 ? character.toUpperCase() : character;\n\t}\n\n\treturn result;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/* globals XMLHttpRequest, FormData */\n/**\n * @module adapter-ckfinder/uploadadapter\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';\nimport { getCsrfToken } from './utils';\n/**\n * A plugin that enables CKFinder uploads in CKEditor 5.\n *\n * Configure the upload URL in\n * {@link module:adapter-ckfinder/uploadadapter~CKFinderAdapterConfig#uploadUrl `ckfinder.uploadUrl`}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class CKFinderUploadAdapter extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    static get requires() {\n        return [FileRepository];\n    }\n    /**\n\t * @inheritDoc\n\t */\n    static get pluginName() {\n        return 'CKFinderUploadAdapter';\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const url = this.editor.config.get('ckfinder.uploadUrl');\n        if (!url) {\n            return;\n        }\n        // Register CKFinderAdapter\n        this.editor.plugins.get(FileRepository).createUploadAdapter = loader => new UploadAdapter(loader, url, this.editor.t);\n    }\n}\n/**\n * Upload adapter for CKFinder.\n *\n * @private\n * @implements module:upload/filerepository~UploadAdapter\n */\nclass UploadAdapter {\n    /**\n\t * Creates a new adapter instance.\n\t *\n\t * @param {module:upload/filerepository~FileLoader} loader\n\t * @param {String} url\n\t * @param {module:utils/locale~Locale#t} t\n\t */\n    constructor(loader, url, t) {\n        /**\n\t\t * FileLoader instance to use during the upload.\n\t\t *\n\t\t * @member {module:upload/filerepository~FileLoader} #loader\n\t\t */\n        this.loader = loader;\n        /**\n\t\t * Upload URL.\n\t\t *\n\t\t * @member {String} #url\n\t\t */\n        this.url = url;\n        /**\n\t\t * Locale translation method.\n\t\t *\n\t\t * @member {module:utils/locale~Locale#t} #t\n\t\t */\n        this.t = t;\n    }\n    /**\n\t * Starts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#upload\n\t * @returns {Promise}\n\t */\n    upload() {\n        return new Promise((resolve, reject) => {\n            this._initRequest();\n            this._initListeners(resolve, reject);\n            this._sendRequest();\n        });\n    }\n    /**\n\t * Aborts the upload process.\n\t *\n\t * @see module:upload/filerepository~UploadAdapter#abort\n\t * @returns {Promise}\n\t */\n    abort() {\n        if (this.xhr) {\n            this.xhr.abort();\n        }\n    }\n    /**\n\t * Initializes the XMLHttpRequest object.\n\t *\n\t * @private\n\t */\n    _initRequest() {\n        const xhr = this.xhr = new XMLHttpRequest();\n        xhr.open('POST', this.url, true);\n        xhr.responseType = 'json';\n    }\n    /**\n\t * Initializes XMLHttpRequest listeners.\n\t *\n\t * @private\n\t * @param {Function} resolve Callback function to be called when the request is successful.\n\t * @param {Function} reject Callback function to be called when the request cannot be completed.\n\t */\n    _initListeners(resolve, reject) {\n        const xhr = this.xhr;\n        const loader = this.loader;\n        const t = this.t;\n        const genericError = t('a') + ` ${ loader.file.name }.`;\n        xhr.addEventListener('error', () => reject(genericError));\n        xhr.addEventListener('abort', () => reject());\n        xhr.addEventListener('load', () => {\n            const response = xhr.response;\n            if (!response || !response.uploaded) {\n                return reject(response && response.error && response.error.message ? response.error.message : genericError);\n            }\n            resolve({ default: response.url });\n        });\n        // Upload progress when it's supported.\n        /* istanbul ignore else */\n        if (xhr.upload) {\n            xhr.upload.addEventListener('progress', evt => {\n                if (evt.lengthComputable) {\n                    loader.uploadTotal = evt.total;\n                    loader.uploaded = evt.loaded;\n                }\n            });\n        }\n    }\n    /**\n\t * Prepares the data and sends the request.\n\t *\n\t * @private\n\t */\n    _sendRequest() {\n        // Prepare form data.\n        const data = new FormData();\n        data.append('upload', this.loader.file);\n        data.append('ckCsrfToken', getCsrfToken());\n        // Send request.\n        this.xhr.send(data);\n    }\n}    /**\n * The configuration of the {@link module:adapter-ckfinder/uploadadapter~CKFinderUploadAdapter CKFinder upload adapter}.\n *\n * Read more in {@link module:adapter-ckfinder/uploadadapter~CKFinderAdapterConfig}.\n *\n * @member {module:adapter-ckfinder/uploadadapter~CKFinderAdapterConfig} module:core/editor/editorconfig~EditorConfig#ckfinder\n */\n     /**\n * The configuration of the {@link module:adapter-ckfinder/uploadadapter~CKFinderUploadAdapter CKFinder upload adapter}.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\tckfinder: {\n *\t\t\t\t\tuploadUrl: '/ckfinder/core/connector/php/connector.php?command=QuickUpload&type=Files&responseType=json'\n * \t\t\t\t}\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface CKFinderAdapterConfig\n */\n     /**\n * The URL to which files should be uploaded.\n *\n * @member {String} module:adapter-ckfinder/uploadadapter~CKFinderAdapterConfig#uploadUrl\n */","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module autoformat/blockautoformatediting\n */\n\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\n\n/**\n * The block autoformatting engine. It allows to format various block patterns. For example,\n * it can be configured to turn a paragraph starting with `*` and followed by a space into a list item.\n *\n * The autoformatting operation is integrated with the undo manager,\n * so the autoformatting step can be undone if the user's intention was not to format the text.\n *\n * See the constructors documentation to learn how to create custom inline autoformatters. You can also use\n * the {@link module:autoformat/autoformat~Autoformat} feature which enables a set of default autoformatters\n * (lists, headings, bold and italic).\n */\nexport default class BlockAutoformatEditing {\n\t/**\n\t * Creates a listener triggered on `change` event in the document.\n\t * Calls the callback when inserted text matches the regular expression or the command name\n\t * if provided instead of the callback.\n\t *\n\t * Examples of usage:\n\t *\n\t * To convert a paragraph to heading 1 when `- ` is typed, using just the commmand name:\n\t *\n\t *\t\tnew BlockAutoformatEditing( editor, /^\\- $/, 'heading1' );\n\t *\n\t * To convert a paragraph to heading 1 when `- ` is typed, using just the callback:\n\t *\n\t *\t\tnew BlockAutoformatEditing( editor, /^\\- $/, ( context ) => {\n\t *\t\t\tconst { match } = context;\n\t *\t\t\tconst headingLevel = match[ 1 ].length;\n\t *\n\t *\t\t\teditor.execute( 'heading', {\n\t *\t\t\t\tformatId: `heading${ headingLevel }`\n\t *\t\t\t} );\n\t * \t\t} );\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {RegExp} pattern The regular expression to execute on just inserted text.\n\t * @param {Function|String} callbackOrCommand The callback to execute or the command to run when the text is matched.\n\t * In case of providing the callback, it receives the following parameter:\n\t * * {Object} match RegExp.exec() result of matching the pattern to inserted text.\n\t */\n\tconstructor( editor, pattern, callbackOrCommand ) {\n\t\tlet callback;\n\n\t\tif ( typeof callbackOrCommand == 'function' ) {\n\t\t\tcallback = callbackOrCommand;\n\t\t} else {\n\t\t\t// We assume that the actual command name was provided.\n\t\t\tconst command = callbackOrCommand;\n\n\t\t\tcallback = () => {\n\t\t\t\teditor.execute( command );\n\t\t\t};\n\t\t}\n\n\t\teditor.model.document.on( 'change', ( evt, batch ) => {\n\t\t\tif ( batch.type == 'transparent' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst changes = Array.from( editor.model.document.differ.getChanges() );\n\t\t\tconst entry = changes[ 0 ];\n\n\t\t\t// Typing is represented by only a single change.\n\t\t\tif ( changes.length != 1 || entry.type !== 'insert' || entry.name != '$text' || entry.length != 1 ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t\tconst item = entry.position.textNode || entry.position.nodeAfter;\n\n\t\t\tif ( !item.parent.is( 'paragraph' ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst match = pattern.exec( item.data );\n\n\t\t\tif ( !match ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Use enqueueChange to create new batch to separate typing batch from the auto-format changes.\n\t\t\teditor.model.enqueueChange( writer => {\n\t\t\t\t// Matched range.\n\t\t\t\tconst range = Range.createFromParentsAndOffsets( item.parent, 0, item.parent, match[ 0 ].length );\n\n\t\t\t\t// Remove matched text.\n\t\t\t\twriter.remove( range );\n\n\t\t\t\tcallback( { match } );\n\t\t\t} );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module autoformat/inlineautoformatediting\n */\n\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\n\n/**\n * The inline autoformatting engine. It allows to format various inline patterns. For example,\n * it can be configured to make \"foo\" bold when typed `**foo**` (the `**` markers will be removed).\n *\n * The autoformatting operation is integrated with the undo manager,\n * so the autoformatting step can be undone if the user's intention was not to format the text.\n *\n * See the constructors documentation to learn how to create custom inline autoformatters. You can also use\n * the {@link module:autoformat/autoformat~Autoformat} feature which enables a set of default autoformatters\n * (lists, headings, bold and italic).\n */\nexport default class InlineAutoformatEditing {\n\t/**\n\t * Enables autoformatting mechanism for a given {@link module:core/editor/editor~Editor}.\n\t *\n\t * It formats the matched text by applying the given model attribute or by running the provided formatting callback.\n\t * On every change applied to the model the autoformatting engine checks the text on the left of the selection\n\t * and executes the provided action if the text matches given criteria (regular expression or callback).\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {Function|RegExp} testRegexpOrCallback The regular expression or callback to execute on text.\n\t * Provided regular expression *must* have three capture groups. The first and the third capture group\n\t * should match opening and closing delimiters. The second capture group should match the text to format.\n\t *\n\t *\t\t// Matches the `**bold text**` pattern.\n\t *\t\t// There are three capturing groups:\n\t *\t\t// - The first to match the starting `**` delimiter.\n\t *\t\t// - The second to match the text to format.\n\t *\t\t// - The third to match the ending `**` delimiter.\n\t *\t\tnew InlineAutoformatEditing( editor, /(\\*\\*)([^\\*]+?)(\\*\\*)$/g, 'bold' );\n\t *\n\t * When a function is provided instead of the regular expression, it will be executed with the text to match as a parameter.\n\t * The function should return proper \"ranges\" to delete and format.\n\t *\n\t *\t\t{\n\t *\t\t\tremove: [\n\t *\t\t\t\t[ 0, 1 ],\t// Remove the first letter from the given text.\n\t *\t\t\t\t[ 5, 6 ]\t// Remove the 6th letter from the given text.\n\t *\t\t\t],\n\t *\t\t\tformat: [\n\t *\t\t\t\t[ 1, 5 ]\t// Format all letters from 2nd to 5th.\n\t *\t\t\t]\n\t *\t\t}\n\t *\n\t * @param {Function|String} attributeOrCallback The name of attribute to apply on matching text or a callback for manual\n\t * formatting.\n\t *\n\t *\t\t// Use attribute name:\n\t *\t\tnew InlineAutoformatEditing( editor, /(\\*\\*)([^\\*]+?)(\\*\\*)$/g, 'bold' );\n\t *\n\t *\t\t// Use formatting callback:\n\t *\t\tnew InlineAutoformatEditing( editor, /(\\*\\*)([^\\*]+?)(\\*\\*)$/g, ( writer, validRanges ) => {\n\t *\t\t\tfor ( let range of validRanges ) {\n\t *\t\t\t\twriter.setAttribute( command, true, range );\n\t *\t\t\t}\n\t *\t\t} );\n\t */\n\tconstructor( editor, testRegexpOrCallback, attributeOrCallback ) {\n\t\tlet regExp;\n\t\tlet attributeKey;\n\t\tlet testCallback;\n\t\tlet formatCallback;\n\n\t\tif ( testRegexpOrCallback instanceof RegExp ) {\n\t\t\tregExp = testRegexpOrCallback;\n\t\t} else {\n\t\t\ttestCallback = testRegexpOrCallback;\n\t\t}\n\n\t\tif ( typeof attributeOrCallback == 'string' ) {\n\t\t\tattributeKey = attributeOrCallback;\n\t\t} else {\n\t\t\tformatCallback = attributeOrCallback;\n\t\t}\n\n\t\t// A test callback run on changed text.\n\t\ttestCallback = testCallback || ( text => {\n\t\t\tlet result;\n\t\t\tconst remove = [];\n\t\t\tconst format = [];\n\n\t\t\twhile ( ( result = regExp.exec( text ) ) !== null ) {\n\t\t\t\t// There should be full match and 3 capture groups.\n\t\t\t\tif ( result && result.length < 4 ) {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\n\t\t\t\tlet {\n\t\t\t\t\tindex,\n\t\t\t\t\t'1': leftDel,\n\t\t\t\t\t'2': content,\n\t\t\t\t\t'3': rightDel\n\t\t\t\t} = result;\n\n\t\t\t\t// Real matched string - there might be some non-capturing groups so we need to recalculate starting index.\n\t\t\t\tconst found = leftDel + content + rightDel;\n\t\t\t\tindex += result[ 0 ].length - found.length;\n\n\t\t\t\t// Start and End offsets of delimiters to remove.\n\t\t\t\tconst delStart = [\n\t\t\t\t\tindex,\n\t\t\t\t\tindex + leftDel.length\n\t\t\t\t];\n\t\t\t\tconst delEnd = [\n\t\t\t\t\tindex + leftDel.length + content.length,\n\t\t\t\t\tindex + leftDel.length + content.length + rightDel.length\n\t\t\t\t];\n\n\t\t\t\tremove.push( delStart );\n\t\t\t\tremove.push( delEnd );\n\n\t\t\t\tformat.push( [ index + leftDel.length, index + leftDel.length + content.length ] );\n\t\t\t}\n\n\t\t\treturn {\n\t\t\t\tremove,\n\t\t\t\tformat\n\t\t\t};\n\t\t} );\n\n\t\t// A format callback run on matched text.\n\t\tformatCallback = formatCallback || ( ( writer, validRanges ) => {\n\t\t\tfor ( const range of validRanges ) {\n\t\t\t\twriter.setAttribute( attributeKey, true, range );\n\t\t\t}\n\n\t\t\t// After applying attribute to the text, remove given attribute from the selection.\n\t\t\t// This way user is able to type a text without attribute used by auto formatter.\n\t\t\twriter.removeSelectionAttribute( attributeKey );\n\t\t} );\n\n\t\teditor.model.document.on( 'change', ( evt, batch ) => {\n\t\t\tif ( batch.type == 'transparent' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selection = editor.model.document.selection;\n\n\t\t\t// Do nothing if selection is not collapsed.\n\t\t\tif ( !selection.isCollapsed ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst changes = Array.from( editor.model.document.differ.getChanges() );\n\t\t\tconst entry = changes[ 0 ];\n\n\t\t\t// Typing is represented by only a single change.\n\t\t\tif ( changes.length != 1 || entry.type !== 'insert' || entry.name != '$text' || entry.length != 1 ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst block = selection.focus.parent;\n\t\t\tconst text = getText( block ).slice( 0, selection.focus.offset );\n\t\t\tconst testOutput = testCallback( text );\n\t\t\tconst rangesToFormat = testOutputToRanges( block, testOutput.format );\n\t\t\tconst rangesToRemove = testOutputToRanges( block, testOutput.remove );\n\n\t\t\tif ( !( rangesToFormat.length && rangesToRemove.length ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Use enqueueChange to create new batch to separate typing batch from the auto-format changes.\n\t\t\teditor.model.enqueueChange( writer => {\n\t\t\t\tconst validRanges = editor.model.schema.getValidRanges( rangesToFormat, attributeKey );\n\n\t\t\t\t// Apply format.\n\t\t\t\tformatCallback( writer, validRanges );\n\n\t\t\t\t// Remove delimiters - use reversed order to not mix the offsets while removing.\n\t\t\t\tfor ( const range of rangesToRemove.reverse() ) {\n\t\t\t\t\twriter.remove( range );\n\t\t\t\t}\n\t\t\t} );\n\t\t} );\n\t}\n}\n\n// Returns whole text from parent element by adding all data from text nodes together.\n//\n// @private\n// @param {module:engine/model/element~Element} element\n// @returns {String}\nfunction getText( element ) {\n\treturn Array.from( element.getChildren() ).reduce( ( a, b ) => a + b.data, '' );\n}\n\n// Converts output of the test function provided to the InlineAutoformatEditing and converts it to the model ranges\n// inside provided block.\n//\n// @private\n// @param {module:engine/model/element~Element} block\n// @param {Array.<Array>} arrays\nfunction testOutputToRanges( block, arrays ) {\n\treturn arrays\n\t\t.filter( array => ( array[ 0 ] !== undefined && array[ 1 ] !== undefined ) )\n\t\t.map( array => ModelRange.createFromParentsAndOffsets( block, array[ 0 ], block, array[ 1 ] ) );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/attributecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\n/**\n * An extension of the base {@link module:core/command~Command} class, which provides utilities for a command\n * that toggles a single attribute on a text or an element.\n *\n * `AttributeCommand` uses {@link module:engine/model/document~Document#selection}\n * to decide which nodes (if any) should be changed, and applies or removes the attribute from them.\n *\n * The command checks the {@link module:engine/model/model~Model#schema} to decide if it can be enabled\n * for the current selection and to which nodes the attribute can be applied.\n *\n * @extends module:core/command~Command\n */\nexport default class AttributeCommand extends Command {\n\t/**\n\t * @param {module:core/editor/editor~Editor} editor\n\t * @param {String} attributeKey Attribute that will be set by the command.\n\t */\n\tconstructor( editor, attributeKey ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The attribute that will be set by the command.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.attributeKey = attributeKey;\n\n\t\t/**\n\t\t * Flag indicating whether the command is active. The command is active when the\n\t\t * {@link module:engine/model/selection~Selection#hasAttribute selection has the attribute} which means that:\n\t\t *\n\t\t * * If the selection is not empty &ndash; That the attribute is set on the first node in the selection that allows this attribute.\n\t\t * * If the selection is empty &ndash; That the selection has the attribute itself (which means that newly typed\n\t\t * text will have this attribute, too).\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #value\n\t\t */\n\t}\n\n\t/**\n\t * Updates the command's {@link #value} and {@link #isEnabled} based on the current selection.\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tthis.value = this._getValueFromFirstAllowedNode();\n\t\tthis.isEnabled = model.schema.checkAttributeInSelection( doc.selection, this.attributeKey );\n\t}\n\n\t/**\n\t * Executes the command &mdash; applies the attribute to the selection or removes it from the selection.\n\t *\n\t * If the command is active (`value == true`), it will remove attributes. Otherwise, it will set attributes.\n\t *\n\t * The execution result differs, depending on the {@link module:engine/model/document~Document#selection}:\n\t *\n\t * * If the selection is on a range, the command applies the attribute to all nodes in that range\n\t * (if they are allowed to have this attribute by the {@link module:engine/model/schema~Schema schema}).\n\t * * If the selection is collapsed in a non-empty node, the command applies the attribute to the\n\t * {@link module:engine/model/document~Document#selection} itself (note that typed characters copy attributes from the selection).\n\t * * If the selection is collapsed in an empty node, the command applies the attribute to the parent node of the selection (note\n\t * that the selection inherits all attributes from a node if it is in an empty node).\n\t *\n\t * @fires execute\n\t * @param {Object} [options] Command options.\n\t * @param {Boolean} [options.forceValue] If set, it will force the command behavior. If `true`, the command will apply the attribute,\n\t * otherwise the command will remove the attribute.\n\t * If not set, the command will look for its current value to decide what it should do.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst value = ( options.forceValue === undefined ) ? !this.value : options.forceValue;\n\n\t\tmodel.change( writer => {\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\tif ( value ) {\n\t\t\t\t\twriter.setSelectionAttribute( this.attributeKey, true );\n\t\t\t\t} else {\n\t\t\t\t\twriter.removeSelectionAttribute( this.attributeKey );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst ranges = model.schema.getValidRanges( selection.getRanges(), this.attributeKey );\n\n\t\t\t\tfor ( const range of ranges ) {\n\t\t\t\t\tif ( value ) {\n\t\t\t\t\t\twriter.setAttribute( this.attributeKey, value, range );\n\t\t\t\t\t} else {\n\t\t\t\t\t\twriter.removeAttribute( this.attributeKey, range );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Checks the attribute value of the first node in the selection that allows the attribute.\n\t * For the collapsed selection returns the selection attribute.\n\t *\n\t * @private\n\t * @returns {Boolean} The attribute value.\n\t */\n\t_getValueFromFirstAllowedNode() {\n\t\tconst model = this.editor.model;\n\t\tconst schema = model.schema;\n\t\tconst selection = model.document.selection;\n\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn selection.hasAttribute( this.attributeKey );\n\t\t}\n\n\t\tfor ( const range of selection.getRanges() ) {\n\t\t\tfor ( const item of range.getItems() ) {\n\t\t\t\tif ( schema.checkAttribute( item, this.attributeKey ) ) {\n\t\t\t\t\treturn item.hasAttribute( this.attributeKey );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn false;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/bold/boldediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport AttributeCommand from '../attributecommand';\n\nconst BOLD = 'bold';\n\n/**\n * The bold editing feature.\n *\n * It registers the `bold` command and introduces the `bold` attribute in the model which renders to the view\n * as a `<strong>` element.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class BoldEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\t// Allow bold attribute on text nodes.\n\t\teditor.model.schema.extend( '$text', { allowAttributes: BOLD } );\n\n\t\t// Build converter from model to view for data and editing pipelines.\n\n\t\teditor.conversion.attributeToElement( {\n\t\t\tmodel: BOLD,\n\t\t\tview: 'strong',\n\t\t\tupcastAlso: [\n\t\t\t\t'b',\n\t\t\t\t{\n\t\t\t\t\tstyles: {\n\t\t\t\t\t\t'font-weight': 'bold'\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\t// Create bold command.\n\t\teditor.commands.add( BOLD, new AttributeCommand( editor, BOLD ) );\n\n\t\t// Set the Ctrl+B keystroke.\n\t\teditor.keystrokes.set( 'CTRL+B', BOLD );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module basic-styles/bold/boldui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport boldIcon from '../../theme/icons/bold.svg';\nconst BOLD = 'bold';\n/**\n * The bold UI feature. It introduces the Bold button.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class BoldUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        // Add bold button to feature components.\n        editor.ui.componentFactory.add(BOLD, locale => {\n            const command = editor.commands.get(BOLD);\n            const view = new ButtonView(locale);\n            view.set({\n                label: t('ay'),\n                icon: boldIcon,\n                keystroke: 'CTRL+B',\n                tooltip: true\n            });\n            view.bind('isOn', 'isEnabled').to(command, 'value', 'isEnabled');\n            // Execute command.\n            this.listenTo(view, 'execute', () => editor.execute(BOLD));\n            return view;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/code/codeediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport AttributeCommand from '../attributecommand';\n\nconst CODE = 'code';\n\n/**\n * The code editing feature.\n *\n * It registers the `code` command and introduces the `code` attribute in the model which renders to the view\n * as a `<code>` element.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class CodeEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Allow code attribute on text nodes.\n\t\teditor.model.schema.extend( '$text', { allowAttributes: CODE } );\n\n\t\teditor.conversion.attributeToElement( {\n\t\t\tmodel: CODE,\n\t\t\tview: 'code',\n\t\t\tupcastAlso: {\n\t\t\t\tstyles: {\n\t\t\t\t\t'word-wrap': 'break-word'\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\t// Create code command.\n\t\teditor.commands.add( CODE, new AttributeCommand( editor, CODE ) );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module basic-styles/code/codeui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport codeIcon from '../../theme/icons/code.svg';\nimport '../../theme/code.css';\nconst CODE = 'code';\n/**\n * The code UI feature. It introduces the Code button.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class CodeUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        // Add code button to feature components.\n        editor.ui.componentFactory.add(CODE, locale => {\n            const command = editor.commands.get(CODE);\n            const view = new ButtonView(locale);\n            view.set({\n                label: t('ax'),\n                icon: codeIcon,\n                tooltip: true\n            });\n            view.bind('isOn', 'isEnabled').to(command, 'value', 'isEnabled');\n            // Execute command.\n            this.listenTo(view, 'execute', () => editor.execute(CODE));\n            return view;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/italic/italicediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport AttributeCommand from '../attributecommand';\n\nconst ITALIC = 'italic';\n\n/**\n * The italic editing feature.\n *\n * It registers the `italic` command, the <kbd>Ctrl+I</kbd> keystroke and introduces the `italic` attribute in the model\n * which renders to the view as an `<em>` element.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ItalicEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Allow italic attribute on text nodes.\n\t\teditor.model.schema.extend( '$text', { allowAttributes: ITALIC } );\n\n\t\teditor.conversion.attributeToElement( {\n\t\t\tmodel: ITALIC,\n\t\t\tview: 'i',\n\t\t\tupcastAlso: [\n\t\t\t\t'em',\n\t\t\t\t{\n\t\t\t\t\tstyles: {\n\t\t\t\t\t\t'font-style': 'italic'\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\t// Create italic command.\n\t\teditor.commands.add( ITALIC, new AttributeCommand( editor, ITALIC ) );\n\n\t\t// Set the Ctrl+I keystroke.\n\t\teditor.keystrokes.set( 'CTRL+I', ITALIC );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module basic-styles/italic/italicui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport italicIcon from '../../theme/icons/italic.svg';\nconst ITALIC = 'italic';\n/**\n * The italic UI feature. It introduces the Italic button.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ItalicUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        // Add bold button to feature components.\n        editor.ui.componentFactory.add(ITALIC, locale => {\n            const command = editor.commands.get(ITALIC);\n            const view = new ButtonView(locale);\n            view.set({\n                label: t('au'),\n                icon: italicIcon,\n                keystroke: 'CTRL+I',\n                tooltip: true\n            });\n            view.bind('isOn', 'isEnabled').to(command, 'value', 'isEnabled');\n            // Execute command.\n            this.listenTo(view, 'execute', () => editor.execute(ITALIC));\n            return view;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module utils/first\n */\n\n/**\n * Returns first item of the given `iterable`.\n *\n * @param {Iterable.<*>} iterable\n * @returns {*}\n */\nexport default function first( iterable ) {\n\tconst iteratorItem = iterable.next();\n\n\tif ( iteratorItem.done ) {\n\t\treturn null;\n\t}\n\n\treturn iteratorItem.value;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module block-quote/blockquotecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\nimport Element from '@ckeditor/ckeditor5-engine/src/model/element';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The block quote command plugin.\n *\n * @extends module:core/command~Command\n */\nexport default class BlockQuoteCommand extends Command {\n\t/**\n\t * Whether the selection starts in a block quote.\n\t *\n\t * @observable\n\t * @readonly\n\t * @member {Boolean} #value\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.value = this._getValue();\n\t\tthis.isEnabled = this._checkEnabled();\n\t}\n\n\t/**\n\t * Executes the command. When the command {@link #value is on}, all block quotes within\n\t * the selection will be removed. If it is off, all selected blocks will be wrapped with\n\t * a block quote.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst schema = model.schema;\n\t\tconst blocks = Array.from( doc.selection.getSelectedBlocks() );\n\n\t\tmodel.change( writer => {\n\t\t\tif ( this.value ) {\n\t\t\t\tthis._removeQuote( writer, blocks.filter( findQuote ) );\n\t\t\t} else {\n\t\t\t\tconst blocksToQuote = blocks.filter( block => {\n\t\t\t\t\t// Already quoted blocks needs to be considered while quoting too\n\t\t\t\t\t// in order to reuse their <bQ> elements.\n\t\t\t\t\treturn findQuote( block ) || checkCanBeQuoted( schema, block );\n\t\t\t\t} );\n\n\t\t\t\tthis._applyQuote( writer, blocksToQuote );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Checks the command's {@link #value}.\n\t *\n\t * @private\n\t * @returns {Boolean} The current value.\n\t */\n\t_getValue() {\n\t\tconst firstBlock = first( this.editor.model.document.selection.getSelectedBlocks() );\n\n\t\t// In the current implementation, the block quote must be an immediate parent of a block element.\n\t\treturn !!( firstBlock && findQuote( firstBlock ) );\n\t}\n\n\t/**\n\t * Checks whether the command can be enabled in the current context.\n\t *\n\t * @private\n\t * @returns {Boolean} Whether the command should be enabled.\n\t */\n\t_checkEnabled() {\n\t\tif ( this.value ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tconst selection = this.editor.model.document.selection;\n\t\tconst schema = this.editor.model.schema;\n\n\t\tconst firstBlock = first( selection.getSelectedBlocks() );\n\n\t\tif ( !firstBlock ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn checkCanBeQuoted( schema, firstBlock );\n\t}\n\n\t/**\n\t * Removes the quote from given blocks.\n\t *\n\t * If blocks which are supposed to be \"unquoted\" are in the middle of a quote,\n\t * start it or end it, then the quote will be split (if needed) and the blocks\n\t * will be moved out of it, so other quoted blocks remained quoted.\n\t *\n\t * @private\n\t * @param {module:engine/model/writer~Writer} writer\n\t * @param {Array.<module:engine/model/element~Element>} blocks\n\t */\n\t_removeQuote( writer, blocks ) {\n\t\t// Unquote all groups of block. Iterate in the reverse order to not break following ranges.\n\t\tgetRangesOfBlockGroups( blocks ).reverse().forEach( groupRange => {\n\t\t\tif ( groupRange.start.isAtStart && groupRange.end.isAtEnd ) {\n\t\t\t\twriter.unwrap( groupRange.start.parent );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// The group of blocks are at the beginning of an <bQ> so let's move them left (out of the <bQ>).\n\t\t\tif ( groupRange.start.isAtStart ) {\n\t\t\t\tconst positionBefore = Position.createBefore( groupRange.start.parent );\n\n\t\t\t\twriter.move( groupRange, positionBefore );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// The blocks are in the middle of an <bQ> so we need to split the <bQ> after the last block\n\t\t\t// so we move the items there.\n\t\t\tif ( !groupRange.end.isAtEnd ) {\n\t\t\t\twriter.split( groupRange.end );\n\t\t\t}\n\n\t\t\t// Now we are sure that groupRange.end.isAtEnd is true, so let's move the blocks right.\n\n\t\t\tconst positionAfter = Position.createAfter( groupRange.end.parent );\n\n\t\t\twriter.move( groupRange, positionAfter );\n\t\t} );\n\t}\n\n\t/**\n\t * Applies the quote to given blocks.\n\t *\n\t * @private\n\t * @param {module:engine/model/writer~Writer} writer\n\t * @param {Array.<module:engine/model/element~Element>} blocks\n\t */\n\t_applyQuote( writer, blocks ) {\n\t\tconst quotesToMerge = [];\n\n\t\t// Quote all groups of block. Iterate in the reverse order to not break following ranges.\n\t\tgetRangesOfBlockGroups( blocks ).reverse().forEach( groupRange => {\n\t\t\tlet quote = findQuote( groupRange.start );\n\n\t\t\tif ( !quote ) {\n\t\t\t\tquote = new Element( 'blockQuote' );\n\n\t\t\t\twriter.wrap( groupRange, quote );\n\t\t\t}\n\n\t\t\tquotesToMerge.push( quote );\n\t\t} );\n\n\t\t// Merge subsequent <bQ> elements. Reverse the order again because this time we want to go through\n\t\t// the <bQ> elements in the source order (due to how merge works – it moves the right element's content\n\t\t// to the first element and removes the right one. Since we may need to merge a couple of subsequent `<bQ>` elements\n\t\t// we want to keep the reference to the first (furthest left) one.\n\t\tquotesToMerge.reverse().reduce( ( currentQuote, nextQuote ) => {\n\t\t\tif ( currentQuote.nextSibling == nextQuote ) {\n\t\t\t\twriter.merge( Position.createAfter( currentQuote ) );\n\n\t\t\t\treturn currentQuote;\n\t\t\t}\n\n\t\t\treturn nextQuote;\n\t\t} );\n\t}\n}\n\nfunction findQuote( elementOrPosition ) {\n\treturn elementOrPosition.parent.name == 'blockQuote' ? elementOrPosition.parent : null;\n}\n\n// Returns a minimal array of ranges containing groups of subsequent blocks.\n//\n// content:         abcdefgh\n// blocks:          [ a, b, d , f, g, h ]\n// output ranges:   [ab]c[d]e[fgh]\n//\n// @param {Array.<module:engine/model/element~Element>} blocks\n// @returns {Array.<module:engine/model/range~Range>}\nfunction getRangesOfBlockGroups( blocks ) {\n\tlet startPosition;\n\tlet i = 0;\n\tconst ranges = [];\n\n\twhile ( i < blocks.length ) {\n\t\tconst block = blocks[ i ];\n\t\tconst nextBlock = blocks[ i + 1 ];\n\n\t\tif ( !startPosition ) {\n\t\t\tstartPosition = Position.createBefore( block );\n\t\t}\n\n\t\tif ( !nextBlock || block.nextSibling != nextBlock ) {\n\t\t\tranges.push( new Range( startPosition, Position.createAfter( block ) ) );\n\t\t\tstartPosition = null;\n\t\t}\n\n\t\ti++;\n\t}\n\n\treturn ranges;\n}\n\n// Checks whether <bQ> can wrap the block.\nfunction checkCanBeQuoted( schema, block ) {\n\t// TMP will be replaced with schema.checkWrap().\n\tconst isBQAllowed = schema.checkChild( block.parent, 'blockQuote' );\n\tconst isBlockAllowedInBQ = schema.checkChild( [ '$root', 'blockQuote' ], block );\n\n\treturn isBQAllowed && isBlockAllowedInBQ;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module block-quote/blockquoteediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport BlockQuoteCommand from './blockquotecommand';\n\n/**\n * The block quote editing.\n *\n * Introduces the `'blockQuote'` command and the `'blockQuote'` model element.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class BlockQuoteEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\n\t\teditor.commands.add( 'blockQuote', new BlockQuoteCommand( editor ) );\n\n\t\tschema.register( 'blockQuote', {\n\t\t\tallowWhere: '$block',\n\t\t\tallowContentOf: '$root'\n\t\t} );\n\n\t\t// Disallow blockQuote in blockQuote.\n\t\tschema.addChildCheck( ( ctx, childDef ) => {\n\t\t\tif ( ctx.endsWith( 'blockQuote' ) && childDef.name == 'blockQuote' ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t} );\n\n\t\teditor.conversion.elementToElement( { model: 'blockQuote', view: 'blockquote' } );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tafterInit() {\n\t\tconst editor = this.editor;\n\t\tconst command = editor.commands.get( 'blockQuote' );\n\n\t\t// Overwrite default Enter key behavior.\n\t\t// If Enter key is pressed with selection collapsed in empty block inside a quote, break the quote.\n\t\t// This listener is added in afterInit in order to register it after list's feature listener.\n\t\t// We can't use a priority for this, because 'low' is already used by the enter feature, unless\n\t\t// we'd use numeric priority in this case.\n\t\tthis.listenTo( this.editor.editing.view.document, 'enter', ( evt, data ) => {\n\t\t\tconst doc = this.editor.model.document;\n\t\t\tconst positionParent = doc.selection.getLastPosition().parent;\n\n\t\t\tif ( doc.selection.isCollapsed && positionParent.isEmpty && command.value ) {\n\t\t\t\tthis.editor.execute( 'blockQuote' );\n\t\t\t\tthis.editor.editing.view.scrollToTheSelection();\n\n\t\t\t\tdata.preventDefault();\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module block-quote/blockquoteui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport quoteIcon from '@ckeditor/ckeditor5-core/theme/icons/quote.svg';\nimport '../theme/blockquote.css';\n/**\n * The block quote UI plugin.\n *\n * It introduces the `'blockQuote'` button.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class BlockQuoteUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        editor.ui.componentFactory.add('blockQuote', locale => {\n            const command = editor.commands.get('blockQuote');\n            const buttonView = new ButtonView(locale);\n            buttonView.set({\n                label: t('ag'),\n                icon: quoteIcon,\n                tooltip: true\n            });\n            // Bind button model to command.\n            buttonView.bind('isOn', 'isEnabled').to(command, 'value', 'isEnabled');\n            // Execute command.\n            this.listenTo(buttonView, 'execute', () => editor.execute('blockQuote'));\n            return buttonView;\n        });\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module paragraph/paragraphcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The paragraph command.\n *\n * @extends module:core/command~Command\n */\nexport default class ParagraphCommand extends Command {\n\t/**\n\t * The value of the command. Indicates whether the selection start is placed in a paragraph.\n\t *\n\t * @readonly\n\t * @observable\n\t * @member {Boolean} #value\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\t\tconst block = first( document.selection.getSelectedBlocks() );\n\n\t\tthis.value = !!block && block.is( 'paragraph' );\n\t\tthis.isEnabled = !!block && checkCanBecomeParagraph( block, model.schema );\n\t}\n\n\t/**\n\t * Executes the command. All the blocks (see {@link module:engine/model/schema~Schema}) in the selection\n\t * will be turned to paragraphs.\n\t *\n\t * @fires execute\n\t * @param {Object} [options] Options for the executed command.\n\t * @param {module:engine/model/selection~Selection|module:engine/model/documentselection~DocumentSelection} [options.selection]\n\t * The selection that the command should be applied to.\n\t * By default, if not provided, the command is applied to the {@link module:engine/model/document~Document#selection}.\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\tmodel.change( writer => {\n\t\t\tconst blocks = ( options.selection || document.selection ).getSelectedBlocks();\n\n\t\t\tfor ( const block of blocks ) {\n\t\t\t\tif ( !block.is( 'paragraph' ) && checkCanBecomeParagraph( block, model.schema ) ) {\n\t\t\t\t\twriter.rename( block, 'paragraph' );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n\n// Checks whether the given block can be replaced by a paragraph.\n//\n// @private\n// @param {module:engine/model/element~Element} block A block to be tested.\n// @param {module:engine/model/schema~Schema} schema The schema of the document.\n// @returns {Boolean}\nfunction checkCanBecomeParagraph( block, schema ) {\n\treturn schema.checkChild( block.parent, 'paragraph' ) && !schema.isObject( block );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module paragraph/paragraph\n */\n\nimport ParagraphCommand from './paragraphcommand';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport { SchemaContext } from '@ckeditor/ckeditor5-engine/src/model/schema';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\n\n/**\n * The paragraph feature for the editor.\n * It introduces the `<paragraph>` element in the model which renders as a `<p>` element in the DOM and data.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Paragraph extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Paragraph';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst data = editor.data;\n\n\t\teditor.commands.add( 'paragraph', new ParagraphCommand( editor ) );\n\n\t\t// Schema.\n\t\tmodel.schema.register( 'paragraph', { inheritAllFrom: '$block' } );\n\n\t\teditor.conversion.elementToElement( { model: 'paragraph', view: 'p' } );\n\n\t\t// Content autoparagraphing. --------------------------------------------------\n\n\t\t// Handles elements not converted by plugins and checks if would be converted if\n\t\t// we wraps them by a paragraph or changes them to a paragraph.\n\t\tdata.upcastDispatcher.on( 'element', ( evt, data, conversionApi ) => {\n\t\t\t// When element is already consumed by higher priority converters then do nothing.\n\t\t\tif ( !conversionApi.consumable.test( data.viewItem, { name: data.viewItem.name } ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// When element is paragraph-like lets try to change it into a paragraph.\n\t\t\tif ( Paragraph.paragraphLikeElements.has( data.viewItem.name ) ) {\n\t\t\t\tif ( data.viewItem.isEmpty ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\tconst paragraph = conversionApi.writer.createElement( 'paragraph' );\n\n\t\t\t\t// Find allowed parent for paragraph that we are going to insert.\n\t\t\t\t// If current parent does not allow to insert paragraph but one of the ancestors does\n\t\t\t\t// then split nodes to allowed parent.\n\t\t\t\tconst splitResult = conversionApi.splitToAllowedParent( paragraph, data.modelCursor );\n\n\t\t\t\t// When there is no split result it means that we can't insert paragraph in this position.\n\t\t\t\tif ( !splitResult ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\n\t\t\t\t// Insert paragraph in allowed position.\n\t\t\t\tconversionApi.writer.insert( paragraph, splitResult.position );\n\n\t\t\t\t// Convert children to paragraph.\n\t\t\t\tconst { modelRange } = conversionApi.convertChildren( data.viewItem, Position.createAt( paragraph ) );\n\n\t\t\t\t// Output range starts before paragraph but ends inside it after last child.\n\t\t\t\t// This is because we want to keep siblings inside the same paragraph as long as it is possible.\n\t\t\t\t// When next node won't be allowed in a paragraph it will split this paragraph anyway.\n\t\t\t\tdata.modelRange = new Range( Position.createBefore( paragraph ), modelRange.end );\n\t\t\t\tdata.modelCursor = data.modelRange.end;\n\n\t\t\t// When element is not paragraph-like lets try to wrap it by a paragraph.\n\t\t\t} else if ( isParagraphable( data.viewItem, data.modelCursor, conversionApi.schema ) ) {\n\t\t\t\tdata = Object.assign( data, wrapInParagraph( data.viewItem, data.modelCursor, conversionApi ) );\n\t\t\t}\n\t\t}, { priority: 'low' } );\n\n\t\t// Handles not converted text nodes and checks if would be converted if we wraps then by a paragraph.\n\t\tdata.upcastDispatcher.on( 'text', ( evt, data, conversionApi ) => {\n\t\t\t// When node is already converted then do nothing.\n\t\t\tif ( data.modelRange ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tif ( isParagraphable( data.viewItem, data.modelCursor, conversionApi.schema ) ) {\n\t\t\t\tdata = Object.assign( data, wrapInParagraph( data.viewItem, data.modelCursor, conversionApi ) );\n\t\t\t}\n\t\t}, { priority: 'lowest' } );\n\n\t\t// Empty roots autoparagraphing. -----------------------------------------------\n\n\t\t// Post-fixer which takes care of adding empty paragraph elements to empty roots.\n\t\t// Besides fixing content on #changesDone we also need to handle #dataReady because\n\t\t// if initial data is empty or setData() wasn't even called there will be no #change fired.\n\t\tmodel.document.registerPostFixer( writer => this._autoparagraphEmptyRoots( writer ) );\n\n\t\teditor.on( 'dataReady', () => {\n\t\t\tmodel.enqueueChange( 'transparent', writer => this._autoparagraphEmptyRoots( writer ) );\n\t\t}, { priority: 'lowest' } );\n\t}\n\n\t/**\n\t * Fixes all empty roots.\n\t *\n\t * @private\n\t * @returns {Boolean} `true` if any change has been applied, `false` otherwise.\n\t */\n\t_autoparagraphEmptyRoots( writer ) {\n\t\tconst model = this.editor.model;\n\n\t\tfor ( const rootName of model.document.getRootNames() ) {\n\t\t\tconst root = model.document.getRoot( rootName );\n\n\t\t\tif ( root.isEmpty && root.rootName != '$graveyard' ) {\n\t\t\t\t// If paragraph element is allowed in the root, create paragraph element.\n\t\t\t\tif ( model.schema.checkChild( root, 'paragraph' ) ) {\n\t\t\t\t\twriter.insertElement( 'paragraph', root );\n\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * A list of element names which should be treated by the autoparagraphing algorithms as\n * paragraph-like. This means that e.g. the following content:\n *\n *\t\t<h1>Foo</h1>\n *\t\t<table>\n *\t\t\t<tr>\n *\t\t\t\t<td>X</td>\n *\t\t\t\t<td>\n *\t\t\t\t\t<ul>\n *\t\t\t\t\t\t<li>Y</li>\n *\t\t\t\t\t\t<li>Z</li>\n *\t\t\t\t\t</ul>\n *\t\t\t\t</td>\n *\t\t\t</tr>\n *\t\t</table>\n *\n * contains five paragraph-like elements: `<h1>`, two `<td>`s and two `<li>`s.\n * Hence, if none of the features is going to convert those elements the above content will be automatically handled\n * by the paragraph feature and converted to:\n *\n *\t\t<p>Foo</p>\n *\t\t<p>X</p>\n *\t\t<p>Y</p>\n *\t\t<p>Z</p>\n *\n * Note: The `<td>` containing two `<li>` elements was ignored as the innermost paragraph-like elements\n * have a priority upon conversion.\n *\n * @member {Set.<String>} module:paragraph/paragraph~Paragraph.paragraphLikeElements\n */\nParagraph.paragraphLikeElements = new Set( [\n\t'blockquote',\n\t'dd',\n\t'div',\n\t'dt',\n\t'h1',\n\t'h2',\n\t'h3',\n\t'h4',\n\t'h5',\n\t'h6',\n\t'li',\n\t'p',\n\t'td'\n] );\n\nfunction wrapInParagraph( input, position, conversionApi ) {\n\tconst paragraph = conversionApi.writer.createElement( 'paragraph' );\n\n\tconversionApi.writer.insert( paragraph, position );\n\treturn conversionApi.convertItem( input, Position.createAt( paragraph ) );\n}\n\nfunction isParagraphable( node, position, schema ) {\n\tconst context = new SchemaContext( position );\n\n\t// When paragraph is allowed in this context...\n\tif ( !schema.checkChild( context, 'paragraph' ) ) {\n\t\treturn false;\n\t}\n\n\t// And a node would be allowed in this paragraph...\n\tif ( !schema.checkChild( context.push( 'paragraph' ), node ) ) {\n\t\treturn false;\n\t}\n\n\treturn true;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module heading/headingcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The heading command. It is used by the {@link module:heading/heading~Heading heading feature} to apply headings.\n *\n * @extends module:core/command~Command\n */\nexport default class HeadingCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor Editor instance.\n\t * @param {Array.<String>} modelElements Names of the element which this command can apply in the model.\n\t */\n\tconstructor( editor, modelElements ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * If the selection starts in a heading (which {@link #modelElements is supported by this command})\n\t\t * the value is set to the name of that heading model element.\n\t\t * It is  set to `false` otherwise.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean|String} #value\n\t\t */\n\n\t\t/**\n\t\t * Set of defined model's elements names that this command support.\n\t\t * See {@link module:heading/heading~HeadingOption}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>}\n\t\t */\n\t\tthis.modelElements = modelElements;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst block = first( this.editor.model.document.selection.getSelectedBlocks() );\n\n\t\tthis.value = !!block && this.modelElements.includes( block.name ) && block.name;\n\t\tthis.isEnabled = !!block && this.modelElements.some( heading => checkCanBecomeHeading( block, heading, this.editor.model.schema ) );\n\t}\n\n\t/**\n\t * Executes the command. Applies the heading to the selected blocks or, if the first selected\n\t * block is a heading already, turns selected headings (of this level only) to paragraphs.\n\t *\n\t * @param {Object} options\n\t * @param {String} options.value Name of the element which this command will apply in the model.\n\t * @fires execute\n\t */\n\texecute( options ) {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\n\t\tconst modelElement = options.value;\n\n\t\tmodel.change( writer => {\n\t\t\tconst blocks = Array.from( document.selection.getSelectedBlocks() )\n\t\t\t\t.filter( block => {\n\t\t\t\t\treturn checkCanBecomeHeading( block, modelElement, model.schema );\n\t\t\t\t} );\n\n\t\t\tfor ( const block of blocks ) {\n\t\t\t\tif ( !block.is( modelElement ) ) {\n\t\t\t\t\twriter.rename( block, modelElement );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n\n// Checks whether the given block can be replaced by a specific heading.\n//\n// @private\n// @param {module:engine/model/element~Element} block A block to be tested.\n// @param {module:heading/headingcommand~HeadingCommand#modelElement} heading Command element name in the model.\n// @param {module:engine/model/schema~Schema} schema The schema of the document.\n// @returns {Boolean}\nfunction checkCanBecomeHeading( block, heading, schema ) {\n\treturn schema.checkChild( block.parent, heading ) && !schema.isObject( block );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module heading/headingediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\nimport HeadingCommand from './headingcommand';\n\nconst defaultModelElement = 'paragraph';\n\n/**\n * The headings engine feature. It handles switching between block formats &ndash; headings and paragraph.\n * This class represents the engine part of the heading feature. See also {@link module:heading/heading~Heading}.\n * It introduces `heading1`-`headingN` commands which allow to convert paragraphs into headings.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class HeadingEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( editor ) {\n\t\tsuper( editor );\n\n\t\teditor.config.define( 'heading', {\n\t\t\toptions: [\n\t\t\t\t{ model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },\n\t\t\t\t{ model: 'heading1', view: 'h2', title: 'Heading 1', class: 'ck-heading_heading1' },\n\t\t\t\t{ model: 'heading2', view: 'h3', title: 'Heading 2', class: 'ck-heading_heading2' },\n\t\t\t\t{ model: 'heading3', view: 'h4', title: 'Heading 3', class: 'ck-heading_heading3' }\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ Paragraph ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst options = editor.config.get( 'heading.options' );\n\n\t\tconst modelElements = [];\n\n\t\tfor ( const option of options ) {\n\t\t\t// Skip paragraph - it is defined in required Paragraph feature.\n\t\t\tif ( option.model !== defaultModelElement ) {\n\t\t\t\t// Schema.\n\t\t\t\teditor.model.schema.register( option.model, {\n\t\t\t\t\tinheritAllFrom: '$block'\n\t\t\t\t} );\n\n\t\t\t\teditor.conversion.elementToElement( option );\n\n\t\t\t\tmodelElements.push( option.model );\n\t\t\t}\n\t\t}\n\n\t\t// Register the heading command for this option.\n\t\teditor.commands.add( 'heading', new HeadingCommand( editor, modelElements ) );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tafterInit() {\n\t\t// If the enter command is added to the editor, alter its behavior.\n\t\t// Enter at the end of a heading element should create a paragraph.\n\t\tconst editor = this.editor;\n\t\tconst enterCommand = editor.commands.get( 'enter' );\n\t\tconst options = editor.config.get( 'heading.options' );\n\n\t\tif ( enterCommand ) {\n\t\t\tthis.listenTo( enterCommand, 'afterExecute', ( evt, data ) => {\n\t\t\t\tconst positionParent = editor.model.document.selection.getFirstPosition().parent;\n\t\t\t\tconst isHeading = options.some( option => positionParent.is( option.model ) );\n\n\t\t\t\tif ( isHeading && !positionParent.is( defaultModelElement ) && positionParent.childCount === 0 ) {\n\t\t\t\t\tdata.writer.rename( positionParent, defaultModelElement );\n\t\t\t\t}\n\t\t\t} );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/model\n */\n\nimport extend from '@ckeditor/ckeditor5-utils/src/lib/lodash/extend';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\n/**\n * The base MVC model class.\n *\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class Model {\n\t/**\n\t * Creates a new Model instance.\n\t *\n\t * @param {Object} [attributes] The model state attributes to be defined during the instance creation.\n\t * @param {Object} [properties] The (out of state) properties to be appended to the instance during creation.\n\t */\n\tconstructor( attributes, properties ) {\n\t\t// Extend this instance with the additional (out of state) properties.\n\t\tif ( properties ) {\n\t\t\textend( this, properties );\n\t\t}\n\n\t\t// Initialize the attributes.\n\t\tif ( attributes ) {\n\t\t\tthis.set( attributes );\n\t\t}\n\t}\n}\n\nmix( Model, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/dropdown/dropdownpanelview\n */\n\nimport View from '../view';\n\n/**\n * The dropdown panel view class.\n *\n * See {@link module:ui/dropdown/dropdownview~DropdownView} to learn about the common usage.\n *\n * @extends module:ui/view~View\n */\nexport default class DropdownPanelView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Controls whether the panel is visible.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isVisible\n\t\t */\n\t\tthis.set( 'isVisible', false );\n\n\t\t/**\n\t\t * Collection of the child views in this panel.\n\t\t *\n\t\t * A common child type is the {@link module:ui/list/listview~ListView} and {@link module:ui/toolbar/toolbarview~ToolbarView}.\n\t\t * See {@link module:ui/dropdown/utils~addListToDropdown} and\n\t\t * {@link module:ui/dropdown/utils~addToolbarToDropdown} to learn more about child views of dropdowns.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset',\n\t\t\t\t\t'ck-dropdown__panel',\n\t\t\t\t\tbind.if( 'isVisible', 'ck-dropdown__panel-visible' )\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.children,\n\n\t\t\ton: {\n\t\t\t\t// Drag and drop in the panel should not break the selection in the editor.\n\t\t\t\t// https://github.com/ckeditor/ckeditor5-ui/issues/228\n\t\t\t\tselectstart: bind.to( evt => evt.preventDefault() )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the view element or first item in view collection on opening dropdown's panel.\n\t *\n\t * See also {@link module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable}.\n\t */\n\tfocus() {\n\t\tif ( this.children.length ) {\n\t\t\tthis.children.first.focus();\n\t\t}\n\t}\n\n\t/**\n\t * Focuses the view element or last item in view collection on opening dropdown's panel.\n\t *\n\t * See also {@link module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable}.\n\t */\n\tfocusLast() {\n\t\tif ( this.children.length ) {\n\t\t\tconst lastChild = this.children.last;\n\n\t\t\tif ( typeof lastChild.focusLast === 'function' ) {\n\t\t\t\tlastChild.focusLast();\n\t\t\t} else {\n\t\t\t\tlastChild.focus();\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/dropdown/dropdownview\n */\n\nimport View from '../view';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\n\nimport '../../theme/components/dropdown/dropdown.css';\n\n/**\n * The dropdown view class. It manages the dropdown button and dropdown panel.\n *\n * In most cases, the easiest way to create a dropdown is by using the {@link module:ui/dropdown/utils~createDropdown}\n * util:\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\tdropdown.panelView.element.textContent = 'Content of the panel';\n *\n *\t\t// Will render a dropdown with a panel containing a \"Content of the panel\" text.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * If you want to add a richer content to the dropdown panel, you can use the {@link module:ui/dropdown/utils~addListToDropdown}\n * and {@link module:ui/dropdown/utils~addToolbarToDropdown} helpers. See more examples in\n * {@link module:ui/dropdown/utils~createDropdown} documentation.\n *\n * If you want to create a completely custom dropdown, then you can compose it manually:\n *\n *\t\tconst button = new DropdownButtonView( locale );\n *\t\tconst panel = new DropdownPanelView( locale );\n *\t\tconst dropdown = new DropdownView( locale, button, panel );\n *\n *\t\tbutton.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\tpanel.element.textContent = 'Content of the panel';\n *\n *\t\t// Will render a dropdown with a panel containing a \"Content of the panel\" text.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * However, dropdown created this way will contain little behavior. You will need to implement handlers for actions\n * such as {@link module:ui/bindings/clickoutsidehandler~clickOutsideHandler clicking outside an open dropdown}\n * (which should close it) and support for arrow keys inside the panel. Therefore, unless you really know what\n * you do and you really need to do it, it is recommended to use the {@link module:ui/dropdown/utils~createDropdown} helper.\n *\n * @extends module:ui/view~View\n */\nexport default class DropdownView extends View {\n\t/**\n\t * Creates an instance of the dropdown.\n\t *\n\t * Also see {@link #render}.\n\t *\n\t * @param {module:utils/locale~Locale} [locale] The localization services instance.\n\t * @param {module:ui/dropdown/button/dropdownbutton~DropdownButton} buttonView\n\t * @param {module:ui/dropdown/dropdownpanelview~DropdownPanelView} panelView\n\t */\n\tconstructor( locale, buttonView, panelView ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Button of the dropdown view. Clicking the button opens the {@link #panelView}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/button/buttonview~ButtonView} #buttonView\n\t\t */\n\t\tthis.buttonView = buttonView;\n\n\t\t/**\n\t\t * Panel of the dropdown. It opens when the {@link #buttonView} is\n\t\t * {@link module:ui/button/buttonview~ButtonView#event:execute executed} (i.e. clicked).\n\t\t *\n\t\t * Child views can be added to the panel's `children` collection:\n\t\t *\n\t\t *\t\tdropdown.panelView.children.add( childView );\n\t\t *\n\t\t * See {@link module:ui/dropdown/dropdownpanelview~DropdownPanelView#children} and\n\t\t * {@link module:ui/viewcollection~ViewCollection#add}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/dropdown/dropdownpanelview~DropdownPanelView} #panelView\n\t\t */\n\t\tthis.panelView = panelView;\n\n\t\t/**\n\t\t * Controls whether the dropdown view is open, i.e. shows or hides the {@link #panelView panel}.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isOpen\n\t\t */\n\t\tthis.set( 'isOpen', false );\n\n\t\t/**\n\t\t * Controls whether the dropdown is enabled, i.e. it can be clicked and execute an action.\n\t\t *\n\t\t * See {@link module:ui/button/buttonview~ButtonView#isEnabled}.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isEnabled\n\t\t */\n\t\tthis.set( 'isEnabled', true );\n\n\t\t/**\n\t\t * Tracks information about DOM focus in the dropdown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * Instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}. It manages\n\t\t * keystrokes of the dropdown:\n\t\t *\n\t\t * * <kbd>▼</kbd> opens the dropdown,\n\t\t * * <kbd>◀</kbd> and <kbd>Esc</kbd> closes the dropdown.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-dropdown',\n\t\t\t\t\tbind.if( 'isEnabled', 'ck-disabled', value => !value )\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\tbuttonView,\n\t\t\t\tpanelView\n\t\t\t]\n\t\t} );\n\n\t\tbuttonView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-dropdown__button',\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\n\t\t/**\n\t\t * A child {@link module:ui/list/listview~ListView list view} of the dropdown located\n\t\t * in its {@link module:ui/dropdown/dropdownview~DropdownView#panelView panel}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addListToDropdown}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/list/listview~ListView} #listView\n\t\t */\n\n\t\t/**\n\t\t * A child toolbar of the dropdown located in the\n\t\t * {@link module:ui/dropdown/dropdownview~DropdownView#panelView panel}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addToolbarToDropdown}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/toolbar/toolbarview~ToolbarView} #toolbarView\n\t\t */\n\n\t\t/**\n\t\t * Fired when the toolbar button or list item is executed.\n\t\t *\n\t\t * For {@link #listView} It fires when a child of some {@link module:ui/list/listitemview~ListItemView}\n\t\t * fired `execute`.\n\t\t *\n\t\t * For {@link #toolbarView} It fires when one of the buttons has been\n\t\t * {@link module:ui/button/buttonview~ButtonView#event:execute executed}.\n\t\t *\n\t\t * **Note**: Only supported when dropdown has list view added using {@link module:ui/dropdown/utils~addListToDropdown}\n\t\t * or {@link module:ui/dropdown/utils~addToolbarToDropdown}.\n\t\t *\n\t\t * @event execute\n\t\t */\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Toggle the dropdown when its button has been clicked.\n\t\tthis.listenTo( this.buttonView, 'open', () => {\n\t\t\tthis.isOpen = !this.isOpen;\n\t\t} );\n\n\t\t// Toggle the visibility of the panel when the dropdown becomes open.\n\t\tthis.panelView.bind( 'isVisible' ).to( this, 'isOpen' );\n\n\t\t// Listen for keystrokes coming from within #element.\n\t\tthis.keystrokes.listenTo( this.element );\n\n\t\t// Register #element in the focus tracker.\n\t\tthis.focusTracker.add( this.element );\n\n\t\tconst closeDropdown = ( data, cancel ) => {\n\t\t\tif ( this.isOpen ) {\n\t\t\t\tthis.buttonView.focus();\n\t\t\t\tthis.isOpen = false;\n\t\t\t\tcancel();\n\t\t\t}\n\t\t};\n\n\t\t// Open the dropdown panel using the arrow down key, just like with return or space.\n\t\tthis.keystrokes.set( 'arrowdown', ( data, cancel ) => {\n\t\t\t// Don't open if the dropdown is disabled or already open.\n\t\t\tif ( this.buttonView.isEnabled && !this.isOpen ) {\n\t\t\t\tthis.isOpen = true;\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\n\t\t// Block the right arrow key (until nested dropdowns are implemented).\n\t\tthis.keystrokes.set( 'arrowright', ( data, cancel ) => {\n\t\t\tif ( this.isOpen ) {\n\t\t\t\tcancel();\n\t\t\t}\n\t\t} );\n\n\t\t// Close the dropdown using the arrow left/escape key.\n\t\tthis.keystrokes.set( 'arrowleft', closeDropdown );\n\t\tthis.keystrokes.set( 'esc', closeDropdown );\n\t}\n\n\t/**\n\t * Focuses the {@link #buttonView}.\n\t */\n\tfocus() {\n\t\tthis.buttonView.focus();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/dropdown/button/dropdownbuttonview\n */\n\nimport ButtonView from '../../button/buttonview';\n\nimport dropdownArrowIcon from '../../../theme/icons/dropdown-arrow.svg';\nimport IconView from '../../icon/iconview';\n\n/**\n * The default dropdown button view class.\n *\n *\t\tconst view = new DropdownButtonView();\n *\n *\t\tview.set( {\n *\t\t\tlabel: 'A button',\n *\t\t\tkeystroke: 'Ctrl+B',\n *\t\t\ttooltip: true\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * Also see the {@link module:ui/dropdown/utils~createDropdown `createDropdown()` util}.\n *\n * @implements module:ui/dropdown/button/dropdownbutton~DropdownButton\n * @extends module:ui/button/buttonview~ButtonView\n */\nexport default class DropdownButtonView extends ButtonView {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * An icon that displays arrow to indicate a dropdown button.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/icon/iconview~IconView}\n\t\t */\n\t\tthis.arrowView = this._createArrowView();\n\n\t\tthis.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\t'aria-haspopup': true\n\t\t\t}\n\t\t} );\n\n\t\t// The DropdownButton interface expects the open event upon which will open the dropdown.\n\t\tthis.delegate( 'execute' ).to( this, 'open' );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.children.add( this.arrowView );\n\t}\n\n\t/**\n\t * Creates a {@link module:ui/icon/iconview~IconView} instance as {@link #arrowView}.\n\t *\n\t * @private\n\t * @returns {module:ui/icon/iconview~IconView}\n\t */\n\t_createArrowView() {\n\t\tconst arrowView = new IconView();\n\n\t\tarrowView.content = dropdownArrowIcon;\n\n\t\tarrowView.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-dropdown__arrow'\n\t\t\t}\n\t\t} );\n\n\t\treturn arrowView;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/list/listview\n */\n\nimport View from '../view';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '../focuscycler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\n\nimport '../../theme/components/list/list.css';\n\n/**\n * The list view class.\n *\n * @extends module:ui/view~View\n * @implements module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable\n */\nexport default class ListView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor() {\n\t\tsuper();\n\n\t\t/**\n\t\t * Collection of the child list views.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.items = this.createCollection();\n\n\t\t/**\n\t\t * Tracks information about DOM focus in the list.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n\t\tthis.focusTracker = new FocusTracker();\n\n\t\t/**\n\t\t * Instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n\t\tthis.keystrokes = new KeystrokeHandler();\n\n\t\t/**\n\t\t * Helps cycling over focusable {@link #items} in the list.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n\t\tthis._focusCycler = new FocusCycler( {\n\t\t\tfocusables: this.items,\n\t\t\tfocusTracker: this.focusTracker,\n\t\t\tkeystrokeHandler: this.keystrokes,\n\t\t\tactions: {\n\t\t\t\t// Navigate list items backwards using the arrowup key.\n\t\t\t\tfocusPrevious: 'arrowup',\n\n\t\t\t\t// Navigate toolbar items forwards using the arrowdown key.\n\t\t\t\tfocusNext: 'arrowdown',\n\t\t\t}\n\t\t} );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'ul',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-reset',\n\t\t\t\t\t'ck-list'\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.items\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\t// Items added before rendering should be known to the #focusTracker.\n\t\tfor ( const item of this.items ) {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t}\n\n\t\tthis.items.on( 'add', ( evt, item ) => {\n\t\t\tthis.focusTracker.add( item.element );\n\t\t} );\n\n\t\tthis.items.on( 'remove', ( evt, item ) => {\n\t\t\tthis.focusTracker.remove( item.element );\n\t\t} );\n\n\t\t// Start listening for the keystrokes coming from #element.\n\t\tthis.keystrokes.listenTo( this.element );\n\t}\n\n\t/**\n\t * Focuses the first focusable in {@link #items}.\n\t */\n\tfocus() {\n\t\tthis._focusCycler.focusFirst();\n\t}\n\n\t/**\n\t * Focuses the last focusable in {@link #items}.\n\t */\n\tfocusLast() {\n\t\tthis._focusCycler.focusLast();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/list/listitemview\n */\n\nimport View from '../view';\n\n/**\n * The list item view class.\n *\n * @extends module:ui/view~View\n */\nexport default class ListItemView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * Collection of the child views inside of the list item {@link #element}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.children = this.createCollection();\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'li',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-list__item'\n\t\t\t\t]\n\t\t\t},\n\n\t\t\tchildren: this.children\n\t\t} );\n\t}\n\n\t/**\n\t * Focuses the list item.\n\t */\n\tfocus() {\n\t\tthis.children.first.focus();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/list/listseparatorview\n */\n\nimport View from '../view';\n\n/**\n * The list separator view class.\n *\n * @extends module:ui/view~View\n */\nexport default class ListSeparatorView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'li',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-list__separator'\n\t\t\t\t]\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/button/switchbuttonview\n */\n\nimport View from '../view';\nimport ButtonView from './buttonview';\n\nimport '../../theme/components/button/switchbutton.css';\n\n/**\n * The switch button view class.\n *\n *\t\tconst view = new SwitchButtonView();\n *\n *\t\tview.set( {\n *\t\t\twithText: true,\n *\t\t\tlabel: 'Switch me!'\n *\t\t} );\n *\n *\t\tview.render();\n *\n *\t\tdocument.body.append( view.element );\n *\n * @extends module:ui/buttonview~ButtonView\n */\nexport default class SwitchButtonView extends ButtonView {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The toggle switch of the button.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/view~View} #toggleSwitchView\n\t\t */\n\t\tthis.toggleSwitchView = this._createToggleView();\n\n\t\tthis.extendTemplate( {\n\t\t\tattributes: {\n\t\t\t\tclass: 'ck-switchbutton'\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tthis.children.add( this.toggleSwitchView );\n\t}\n\n\t/**\n\t * Creates a toggle child view.\n\t *\n\t * @private\n\t * @returns {module:ui/view~View}\n\t */\n\t_createToggleView() {\n\t\tconst toggleSwitchView = new View();\n\n\t\ttoggleSwitchView.setTemplate( {\n\t\t\ttag: 'span',\n\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-button__toggle'\n\t\t\t\t],\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'span',\n\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [\n\t\t\t\t\t\t\t'ck',\n\t\t\t\t\t\t\t'ck-button__toggle__inner'\n\t\t\t\t\t\t],\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t]\n\t\t} );\n\n\t\treturn toggleSwitchView;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/bindings/clickoutsidehandler\n */\n\n/* global document */\n\n/**\n * Handles clicking **outside** of a specified set of elements, then fires an action.\n *\n * **Note**: Actually, the action is executed upon `mousedown`, not `click`. It prevents\n * certain issues when the user keeps holding the mouse button and the UI cannot react\n * properly.\n *\n * @param {Object} options Configuration options.\n * @param {module:utils/dom/emittermixin~Emitter} options.emitter The emitter to which this behavior\n * should be added.\n * @param {Function} options.activator Function returning a `Boolean`, to determine whether the handler is active.\n * @param {Array.<HTMLElement>} options.contextElements HTML elements that determine the scope of the\n * handler. Clicking any of them or their descendants will **not** fire the callback.\n * @param {Function} options.callback An action executed by the handler.\n */\nexport default function clickOutsideHandler( { emitter, activator, callback, contextElements } ) {\n\temitter.listenTo( document, 'mousedown', ( evt, { target } ) => {\n\t\tif ( !activator() ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const contextElement of contextElements ) {\n\t\t\tif ( contextElement.contains( target ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\n\t\tcallback();\n\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/dropdown/utils\n */\n\nimport DropdownPanelView from './dropdownpanelview';\nimport DropdownView from './dropdownview';\nimport DropdownButtonView from './button/dropdownbuttonview';\nimport ToolbarView from '../toolbar/toolbarview';\nimport ListView from '../list/listview';\nimport ListItemView from '../list/listitemview';\nimport ListSeparatorView from '../list/listseparatorview';\nimport ButtonView from '../button/buttonview';\nimport SwitchButtonView from '../button/switchbuttonview';\n\nimport clickOutsideHandler from '../bindings/clickoutsidehandler';\n\nimport '../../theme/components/dropdown/toolbardropdown.css';\nimport '../../theme/components/dropdown/listdropdown.css';\n\n/**\n * A helper for creating dropdowns. It creates an instance of a {@link module:ui/dropdown/dropdownview~DropdownView dropdown},\n * with a {@link module:ui/dropdown/button/dropdownbutton~DropdownButton button},\n * {@link module:ui/dropdown/dropdownpanelview~DropdownPanelView panel} and all standard dropdown's behaviors.\n *\n * # Creating dropdowns\n *\n * By default, the default {@link module:ui/dropdown/button/dropdownbuttonview~DropdownButtonView} class is used as\n * definition of the button:\n *\n *\t\tconst dropdown = createDropdown( model );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\t// Will render a dropdown labeled \"A dropdown\" with an empty panel.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * You can also provide other button views (they need to implement the\n * {module:ui/dropdown/button/dropdownbutton~DropdownButton} interface). For instance, you can use\n * {@link module:ui/dropdown/button/splitbuttonview~SplitButtonView} to create a dropdown with a split button.\n *\n *\t\tconst dropdown = createDropdown( model, SplitButtonView );\n *\n *\t\t// Configure dropdown's button properties:\n *\t\tdropdown.buttonView.set( {\n *\t\t\tlabel: 'A dropdown',\n *\t\t\twithText: true\n *\t\t} );\n *\n *\t\tdropdown.buttonView.on( 'execute', () => {\n *\t\t\t// Add the behavior of the \"action part\" of the split button.\n *\t\t\t// Split button consists of the \"action part\" and \"arrow part\".\n *\t\t\t// The arrow opens the dropdown while the action part can have some other behavior.\n * \t\t} );\n *\n *\t\tdropdown.render();\n *\n *\t\t// Will render a dropdown labeled \"A dropdown\" with an empty panel.\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * # Adding content to the dropdown's panel\n *\n * The content of the panel can be inserted directly into the `dropdown.panelView.element`:\n *\n *\t\tdropdown.panelView.element.textContent = 'Content of the panel';\n *\n * However, most of the time you will want to add there either a {@link module:ui/list/listview~ListView list of options}\n * or a list of buttons (i.e. a {@link module:ui/toolbar/toolbarview~ToolbarView toolbar}).\n * To simplify the task, you can use, respectively, {@link module:ui/dropdown/utils~addListToDropdown} or\n * {@link module:ui/dropdown/utils~addToolbarToDropdown} utils.\n *\n * @param {module:utils/locale~Locale} locale The locale instance.\n * @param {Function} ButtonClass The dropdown button view class. Needs to implement the\n * {@link module:ui/dropdown/button/dropdownbutton~DropdownButton} interface.\n * @returns {module:ui/dropdown/dropdownview~DropdownView} The dropdown view instance.\n */\nexport function createDropdown( locale, ButtonClass = DropdownButtonView ) {\n\tconst buttonView = new ButtonClass( locale );\n\n\tconst panelView = new DropdownPanelView( locale );\n\tconst dropdownView = new DropdownView( locale, buttonView, panelView );\n\n\tbuttonView.bind( 'isEnabled' ).to( dropdownView );\n\n\tif ( buttonView instanceof DropdownButtonView ) {\n\t\tbuttonView.bind( 'isOn' ).to( dropdownView, 'isOpen' );\n\t} else {\n\t\tbuttonView.arrowView.bind( 'isOn' ).to( dropdownView, 'isOpen' );\n\t}\n\n\taddDefaultBehavior( dropdownView );\n\n\treturn dropdownView;\n}\n\n/**\n * Adds an instance of {@link module:ui/toolbar/toolbarview~ToolbarView} to a dropdown.\n *\n *\t\tconst buttons = [];\n *\n *\t\t// Either create a new ButtonView instance or create existing.\n *\t\tbuttons.push( new ButtonView() );\n *\t\tbuttons.push( editor.ui.componentFactory.get( 'someButton' ) );\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\taddToolbarToDropdown( dropdown, buttons );\n *\n *\t\tdropdown.toolbarView.isVertical = true;\n *\n *\t\t// Will render a vertical button dropdown labeled \"A button dropdown\"\n *\t\t// with a button group in the panel containing two buttons.\n *\t\tdropdown.render()\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * See {@link module:ui/dropdown/utils~createDropdown} and {@link module:ui/toolbar/toolbarview~ToolbarView}.\n *\n * @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView A dropdown instance to which `ToolbarView` will be added.\n * @param {Iterable.<module:ui/button/buttonview~ButtonView>} buttons\n */\nexport function addToolbarToDropdown( dropdownView, buttons ) {\n\tconst toolbarView = dropdownView.toolbarView = new ToolbarView();\n\n\tdropdownView.extendTemplate( {\n\t\tattributes: {\n\t\t\tclass: [ 'ck-toolbar-dropdown' ]\n\t\t}\n\t} );\n\n\tbuttons.map( view => toolbarView.items.add( view ) );\n\n\tdropdownView.panelView.children.add( toolbarView );\n\ttoolbarView.items.delegate( 'execute' ).to( dropdownView );\n}\n\n/**\n * Adds an instance of {@link module:ui/list/listview~ListView} to a dropdown.\n *\n *\t\tconst items = new Collection();\n *\n *\t\titems.add( {\n *\t\t\ttype: 'button',\n *\t\t\tmodel: new Model( { label: 'First item', labelStyle: 'color: red' } )\n *\t\t} );\n *\n *\t\titems.add( {\n *\t\t\t type: 'button',\n *\t\t\t model: new Model( { label: 'Second item', labelStyle: 'color: green', class: 'foo' } )\n * \t\t} );\n *\n *\t\tconst dropdown = createDropdown( locale );\n *\n *\t\taddListToDropdown( dropdown, items );\n *\n *\t\t// Will render a dropdown with a list in the panel containing two items.\n *\t\tdropdown.render()\n *\t\tdocument.body.appendChild( dropdown.element );\n *\n * The `items` collection passed to this methods controls the presence and attributes of respective\n * {@link module:ui/list/listitemview~ListItemView list items}.\n *\n *\n * See {@link module:ui/dropdown/utils~createDropdown} and {@link module:list/list~List}.\n *\n * @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView A dropdown instance to which `ListVIew` will be added.\n * @param {Iterable.<module:ui/dropdown/utils~ListDropdownItemDefinition>} items\n * A collection of the list item definitions to populate the list.\n */\nexport function addListToDropdown( dropdownView, items ) {\n\tconst locale = dropdownView.locale;\n\tconst listView = dropdownView.listView = new ListView( locale );\n\n\tlistView.items.bindTo( items ).using( ( { type, model } ) => {\n\t\tif ( type === 'separator' ) {\n\t\t\treturn new ListSeparatorView( locale );\n\t\t} else if ( type === 'button' || type === 'switchbutton' ) {\n\t\t\tconst listItemView = new ListItemView( locale );\n\t\t\tlet buttonView;\n\n\t\t\tif ( type === 'button' ) {\n\t\t\t\tbuttonView = new ButtonView( locale );\n\t\t\t} else {\n\t\t\t\tbuttonView = new SwitchButtonView( locale );\n\t\t\t}\n\n\t\t\t// Bind all model properties to the button view.\n\t\t\tbuttonView.bind( ...Object.keys( model ) ).to( model );\n\t\t\tbuttonView.delegate( 'execute' ).to( listItemView );\n\n\t\t\tlistItemView.children.add( buttonView );\n\n\t\t\treturn listItemView;\n\t\t}\n\t} );\n\n\tdropdownView.panelView.children.add( listView );\n\n\tlistView.items.delegate( 'execute' ).to( dropdownView );\n}\n\n// Add a set of default behaviors to dropdown view.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction addDefaultBehavior( dropdownView ) {\n\tcloseDropdownOnBlur( dropdownView );\n\tcloseDropdownOnExecute( dropdownView );\n\tfocusDropdownContentsOnArrows( dropdownView );\n}\n\n// Adds a behavior to a dropdownView that closes opened dropdown when user clicks outside the dropdown.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction closeDropdownOnBlur( dropdownView ) {\n\tdropdownView.on( 'render', () => {\n\t\tclickOutsideHandler( {\n\t\t\temitter: dropdownView,\n\t\t\tactivator: () => dropdownView.isOpen,\n\t\t\tcallback: () => {\n\t\t\t\tdropdownView.isOpen = false;\n\t\t\t},\n\t\t\tcontextElements: [ dropdownView.element ]\n\t\t} );\n\t} );\n}\n\n// Adds a behavior to a dropdownView that closes the dropdown view on \"execute\" event.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction closeDropdownOnExecute( dropdownView ) {\n\t// Close the dropdown when one of the list items has been executed.\n\tdropdownView.on( 'execute', evt => {\n\t\t// Toggling a switch button view should not close the dropdown.\n\t\tif ( evt.source instanceof SwitchButtonView ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdropdownView.isOpen = false;\n\t} );\n}\n\n// Adds a behavior to a dropdownView that focuses the dropdown's panel view contents on keystrokes.\n//\n// @param {module:ui/dropdown/dropdownview~DropdownView} dropdownView\nfunction focusDropdownContentsOnArrows( dropdownView ) {\n\t// If the dropdown panel is already open, the arrow down key should focus the first child of the #panelView.\n\tdropdownView.keystrokes.set( 'arrowdown', ( data, cancel ) => {\n\t\tif ( dropdownView.isOpen ) {\n\t\t\tdropdownView.panelView.focus();\n\t\t\tcancel();\n\t\t}\n\t} );\n\n\t// If the dropdown panel is already open, the arrow up key should focus the last child of the #panelView.\n\tdropdownView.keystrokes.set( 'arrowup', ( data, cancel ) => {\n\t\tif ( dropdownView.isOpen ) {\n\t\t\tdropdownView.panelView.focusLast();\n\t\t\tcancel();\n\t\t}\n\t} );\n}\n\n/**\n * A definition of the list item used by the {@link module:ui/dropdown/utils~addListToDropdown}\n * utility.\n *\n * @typedef {Object} module:ui/dropdown/utils~ListDropdownItemDefinition\n *\n * @property {String} type Either `'separator'`, `'button'` or `'switchbutton'`.\n * @property {module:ui/model~Model} [model] Model of the item (when **not** `'separator'`).\n * Its properties fuel the newly created list item (or its children, depending on the `type`).\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module heading/headingui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Model from '@ckeditor/ckeditor5-ui/src/model';\nimport {\n    createDropdown,\n    addListToDropdown\n} from '@ckeditor/ckeditor5-ui/src/dropdown/utils';\nimport { getLocalizedOptions } from './utils';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport '../theme/heading.css';\n/**\n * The headings UI feature. It introduces the `headings` dropdown.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class HeadingUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = editor.t;\n        const options = getLocalizedOptions(editor);\n        const defaultTitle = t('av');\n        const dropdownTooltip = t('aw');\n        // Register UI component.\n        editor.ui.componentFactory.add('heading', locale => {\n            const titles = {};\n            const itemDefinitions = new Collection();\n            const headingCommand = editor.commands.get('heading');\n            const paragraphCommand = editor.commands.get('paragraph');\n            const commands = [headingCommand];\n            for (const option of options) {\n                const def = {\n                    type: 'button',\n                    model: new Model({\n                        label: option.title,\n                        class: option.class,\n                        withText: true\n                    })\n                };\n                if (option.model === 'paragraph') {\n                    def.model.bind('isOn').to(paragraphCommand, 'value');\n                    def.model.set('commandName', 'paragraph');\n                    commands.push(paragraphCommand);\n                } else {\n                    def.model.bind('isOn').to(headingCommand, 'value', value => value === option.model);\n                    def.model.set({\n                        commandName: 'heading',\n                        commandValue: option.model\n                    });\n                }\n                // Add the option to the collection.\n                itemDefinitions.add(def);\n                titles[option.model] = option.title;\n            }\n            const dropdownView = createDropdown(locale);\n            addListToDropdown(dropdownView, itemDefinitions);\n            dropdownView.buttonView.set({\n                isOn: false,\n                withText: true,\n                tooltip: dropdownTooltip\n            });\n            dropdownView.extendTemplate({ attributes: { class: ['ck-heading-dropdown'] } });\n            dropdownView.bind('isEnabled').toMany(commands, 'isEnabled', (...areEnabled) => {\n                return areEnabled.some(isEnabled => isEnabled);\n            });\n            dropdownView.buttonView.bind('label').to(headingCommand, 'value', paragraphCommand, 'value', (value, para) => {\n                const whichModel = value || para && 'paragraph';\n                // If none of the commands is active, display default title.\n                return titles[whichModel] ? titles[whichModel] : defaultTitle;\n            });\n            // Execute command when an item from the dropdown is selected.\n            this.listenTo(dropdownView, 'execute', evt => {\n                editor.execute(evt.source.commandName, evt.source.commandValue ? { value: evt.source.commandValue } : undefined);\n                editor.editing.view.focus();\n            });\n            return dropdownView;\n        });\n    }\n}","/**\n * Returns heading options as defined in `config.heading.options` but processed to consider\n * editor localization, i.e. to display {@link module:heading/heading~HeadingOption}\n * in the correct language.\n *\n * Note: The reason behind this method is that there's no way to use {@link module:utils/locale~Locale#t}\n * when the user config is defined because the editor does not exist yet.\n *\n * @param {module:core/editor/editor~Editor} editor\n * @returns {Array.<module:heading/heading~HeadingOption>}.\n */\nexport function getLocalizedOptions(editor) {\n    const t = editor.t;\n    const localizedTitles = {\n        Paragraph: t('az'),\n        'Heading 1': t('ba'),\n        'Heading 2': t('bb'),\n        'Heading 3': t('bc')\n    };\n    return editor.config.get('heading.options').map(option => {\n        const title = localizedTitles[option.title];\n        if (title && title != option.title) {\n            // Clone the option to avoid altering the original `config.heading.options`.\n            option = Object.assign({}, option, { title });\n        }\n        return option;\n    });\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/image/imageloadobserver\n */\n\nimport Observer from '@ckeditor/ckeditor5-engine/src/view/observer/observer';\n\n/**\n * Observes all new images added to the {@link module:engine/view/document~Document},\n * fires {@link module:engine/view/document~Document#event:imageLoaded} and\n * {@link module:engine/view/document~Document#event:layoutChanged} event every time when the new image\n * has been loaded.\n *\n * **Note:** This event is not fired for images that has been added to the document and rendered as `complete` (already loaded).\n *\n * @extends module:engine/view/observer/observer~Observer\n */\nexport default class ImageLoadObserver extends Observer {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\t/**\n\t\t * List of img DOM elements that are observed by this observer.\n\t\t *\n\t\t * @private\n\t\t * @type {Set.<HTMLElement>}\n\t\t */\n\t\tthis._observedElements = new Set();\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tobserve( domRoot, name ) {\n\t\tconst viewRoot = this.document.getRoot( name );\n\n\t\t// When there is a change in one of the view element\n\t\t// we need to check if there are any new `<img/>` elements to observe.\n\t\tviewRoot.on( 'change:children', ( evt, node ) => {\n\t\t\t// Wait for the render to be sure that `<img/>` elements are rendered in the DOM root.\n\t\t\tthis.view.once( 'render', () => this._updateObservedElements( domRoot, node ) );\n\t\t} );\n\t}\n\n\t/**\n\t * Updates the list of observed `<img/>` elements.\n\t *\n\t * @private\n\t * @param {HTMLElement} domRoot DOM root element.\n\t * @param {module:engine/view/element~Element} viewNode View element where children have changed.\n\t */\n\t_updateObservedElements( domRoot, viewNode ) {\n\t\tif ( !viewNode.is( 'element' ) || viewNode.is( 'attributeElement' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst domNode = this.view.domConverter.mapViewToDom( viewNode );\n\n\t\t// If there is no `domNode` it means that it was removed from the DOM in the meanwhile.\n\t\tif ( !domNode ) {\n\t\t\treturn;\n\t\t}\n\n\t\tfor ( const domElement of domNode.querySelectorAll( 'img' ) ) {\n\t\t\tif ( !this._observedElements.has( domElement ) ) {\n\t\t\t\tthis.listenTo( domElement, 'load', ( evt, domEvt ) => this._fireEvents( domEvt ) );\n\t\t\t\tthis._observedElements.add( domElement );\n\t\t\t}\n\t\t}\n\n\t\t// Clean up the list of observed elements from elements that has been removed from the root.\n\t\tfor ( const domElement of this._observedElements ) {\n\t\t\tif ( !domRoot.contains( domElement ) ) {\n\t\t\t\tthis.stopListening( domElement );\n\t\t\t\tthis._observedElements.delete( domElement );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Fires {@link module:engine/view/document~Document#event:layoutChanged} and\n\t * {@link module:engine/view/document~Document#event:imageLoaded}\n\t * if observer {@link #isEnabled is enabled}.\n\t *\n\t * @protected\n\t * @param {Event} domEvent The DOM event.\n\t */\n\t_fireEvents( domEvent ) {\n\t\tif ( this.isEnabled ) {\n\t\t\tthis.document.fire( 'layoutChanged' );\n\t\t\tthis.document.fire( 'imageLoaded', domEvent );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tdestroy() {\n\t\tthis._observedElements.clear();\n\t\tsuper.destroy();\n\t}\n}\n\n/**\n * Fired when an <img/> DOM element has been loaded in the DOM root.\n *\n * Introduced by {@link module:image/image/imageloadobserver~ImageLoadObserver}.\n *\n * @see module:image/image/imageloadobserver~ImageLoadObserver\n * @event module:engine/view/document~Document#event:imageLoaded\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/image/converters\n */\n\nimport ModelPosition from '@ckeditor/ckeditor5-engine/src/model/position';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * Returns a function that converts the image view representation:\n *\n *\t\t<figure class=\"image\"><img src=\"...\" alt=\"...\"></img></figure>\n *\n * to the model representation:\n *\n *\t\t<image src=\"...\" alt=\"...\"></image>\n *\n * The entire content of the `<figure>` element except the first `<img>` is being converted as children\n * of the `<image>` model element.\n *\n * @returns {Function}\n */\nexport function viewFigureToModel() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element:figure', converter );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n\t\t// Do not convert if this is not an \"image figure\".\n\t\tif ( !conversionApi.consumable.test( data.viewItem, { name: true, classes: 'image' } ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Find an image element inside the figure element.\n\t\tconst viewImage = Array.from( data.viewItem.getChildren() ).find( viewChild => viewChild.is( 'img' ) );\n\n\t\t// Do not convert if image element is absent, is missing src attribute or was already converted.\n\t\tif ( !viewImage || !viewImage.hasAttribute( 'src' ) || !conversionApi.consumable.test( viewImage, { name: true } ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Convert view image to model image.\n\t\tconst conversionResult = conversionApi.convertItem( viewImage, data.modelCursor );\n\n\t\t// Get image element from conversion result.\n\t\tconst modelImage = first( conversionResult.modelRange.getItems() );\n\n\t\t// When image wasn't successfully converted then finish conversion.\n\t\tif ( !modelImage ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Convert rest of the figure element's children as an image children.\n\t\tconversionApi.convertChildren( data.viewItem, ModelPosition.createAt( modelImage ) );\n\n\t\t// Set image range as conversion result.\n\t\tdata.modelRange = conversionResult.modelRange;\n\n\t\t// Continue conversion where image conversion ends.\n\t\tdata.modelCursor = conversionResult.modelCursor;\n\t}\n}\n\n/**\n * Converter used to convert the `srcset` model image attribute to the `srcset`, `sizes` and `width` attributes in the view.\n *\n * @returns {Function}\n */\nexport function srcsetAttributeConverter() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'attribute:srcset:image', converter );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst writer = conversionApi.writer;\n\t\tconst figure = conversionApi.mapper.toViewElement( data.item );\n\t\tconst img = figure.getChild( 0 );\n\n\t\tif ( data.attributeNewValue === null ) {\n\t\t\tconst srcset = data.attributeOldValue;\n\n\t\t\tif ( srcset.data ) {\n\t\t\t\twriter.removeAttribute( 'srcset', img );\n\t\t\t\twriter.removeAttribute( 'sizes', img );\n\n\t\t\t\tif ( srcset.width ) {\n\t\t\t\t\twriter.removeAttribute( 'width', img );\n\t\t\t\t}\n\t\t\t}\n\t\t} else {\n\t\t\tconst srcset = data.attributeNewValue;\n\n\t\t\tif ( srcset.data ) {\n\t\t\t\twriter.setAttribute( 'srcset', srcset.data, img );\n\t\t\t\t// Always outputting `100vw`. See https://github.com/ckeditor/ckeditor5-image/issues/2.\n\t\t\t\twriter.setAttribute( 'sizes', '100vw', img );\n\n\t\t\t\tif ( srcset.width ) {\n\t\t\t\t\twriter.setAttribute( 'width', srcset.width, img );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n\nexport function modelToViewAttributeConverter( attributeKey ) {\n\treturn dispatcher => {\n\t\tdispatcher.on( `attribute:${ attributeKey }:image`, converter );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst figure = conversionApi.mapper.toViewElement( data.item );\n\t\tconst img = figure.getChild( 0 );\n\n\t\tif ( data.attributeNewValue !== null ) {\n\t\t\tviewWriter.setAttribute( data.attributeKey, data.attributeNewValue, img );\n\t\t} else {\n\t\t\tviewWriter.removeAttribute( data.attributeKey, img );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/image/utils\n */\n\nimport { toWidget, isWidget } from '@ckeditor/ckeditor5-widget/src/utils';\nimport ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';\n\nconst imageSymbol = Symbol( 'isImage' );\n\n/**\n * Converts a given {@link module:engine/view/element~Element} to an image widget:\n * * Adds a {@link module:engine/view/element~Element#_setCustomProperty custom property} allowing to recognize the image widget element.\n * * Calls the {@link module:widget/utils~toWidget} function with the proper element's label creator.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @param {module:engine/view/writer~Writer} writer An instance of the view writer.\n * @param {String} label The element's label. It will be concatenated with the image `alt` attribute if one is present.\n * @returns {module:engine/view/element~Element}\n */\nexport function toImageWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( imageSymbol, true, viewElement );\n\n\treturn toWidget( viewElement, writer, { label: labelCreator } );\n\n\tfunction labelCreator() {\n\t\tconst imgElement = viewElement.getChild( 0 );\n\t\tconst altText = imgElement.getAttribute( 'alt' );\n\n\t\treturn altText ? `${ altText } ${ label }` : label;\n\t}\n}\n\n/**\n * Checks if a given view element is an image widget.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @returns {Boolean}\n */\nexport function isImageWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( imageSymbol ) && isWidget( viewElement );\n}\n\n/**\n * Checks if an image widget is the only selected element.\n *\n * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} selection\n * @returns {Boolean}\n */\nexport function isImageWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isImageWidget( viewElement ) );\n}\n\n/**\n * Checks if the provided model element is an instance of {@link module:engine/model/element~Element Element} and its name\n * is `image`.\n *\n * @param {module:engine/model/element~Element} modelElement\n * @returns {Boolean}\n */\nexport function isImage( modelElement ) {\n\treturn modelElement instanceof ModelElement && modelElement.name == 'image';\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/image/imageediting\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageLoadObserver from './imageloadobserver';\nimport {\n    viewFigureToModel,\n    modelToViewAttributeConverter,\n    srcsetAttributeConverter\n} from './converters';\nimport { toImageWidget } from './utils';\nimport { downcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {\n    upcastElementToElement,\n    upcastAttributeToAttribute\n} from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\n/**\n * The image engine plugin.\n * It registers `<image>` as a block element in the document schema, and allows `alt`, `src` and `srcset` attributes.\n * It also egisters converters for editing and data pipelines.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageEditing extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const schema = editor.model.schema;\n        const t = editor.t;\n        const conversion = editor.conversion;\n        // See https://github.com/ckeditor/ckeditor5-image/issues/142.\n        editor.editing.view.addObserver(ImageLoadObserver);\n        // Configure schema.\n        schema.register('image', {\n            isObject: true,\n            isBlock: true,\n            allowWhere: '$block',\n            allowAttributes: [\n                'alt',\n                'src',\n                'srcset'\n            ]\n        });\n        conversion.for('dataDowncast').add(downcastElementToElement({\n            model: 'image',\n            view: (modelElement, viewWriter) => createImageViewElement(viewWriter)\n        }));\n        conversion.for('editingDowncast').add(downcastElementToElement({\n            model: 'image',\n            view: (modelElement, viewWriter) => toImageWidget(createImageViewElement(viewWriter), viewWriter, t('ae'))\n        }));\n        conversion.for('downcast').add(modelToViewAttributeConverter('src')).add(modelToViewAttributeConverter('alt')).add(srcsetAttributeConverter());\n        conversion.for('upcast').add(upcastElementToElement({\n            view: {\n                name: 'img',\n                attributes: { src: true }\n            },\n            model: (viewImage, modelWriter) => modelWriter.createElement('image', { src: viewImage.getAttribute('src') })\n        })).add(upcastAttributeToAttribute({\n            view: {\n                name: 'img',\n                key: 'alt'\n            },\n            model: 'alt'\n        })).add(upcastAttributeToAttribute({\n            view: {\n                name: 'img',\n                key: 'srcset'\n            },\n            model: {\n                key: 'srcset',\n                value: viewImage => {\n                    const value = { data: viewImage.getAttribute('srcset') };\n                    if (viewImage.hasAttribute('width')) {\n                        value.width = viewImage.getAttribute('width');\n                    }\n                    return value;\n                }\n            }\n        })).add(viewFigureToModel());\n    }\n}\n// Creates a view element representing the image.\n//\n//\t\t<figure class=\"image\"><img></img></figure>\n//\n// Note that `alt` and `src` attributes are converted separately, so they are not included.\n//\n// @private\n// @param {module:engine/view/writer~Writer} writer\n// @returns {module:engine/view/containerelement~ContainerElement}\nexport function createImageViewElement(writer) {\n    const emptyElement = writer.createEmptyElement('img');\n    const figure = writer.createContainerElement('figure', { class: 'image' });\n    writer.insert(ViewPosition.createAt(figure), emptyElement);\n    return figure;\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagetextalternative/imagetextalternativecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { isImage } from '../image/utils';\n\n/**\n * The image text alternative command. It is used to change the `alt` attribute of `<image>` elements.\n *\n * @extends module:core/command~Command\n */\nexport default class ImageTextAlternativeCommand extends Command {\n\t/**\n\t * The command value: `false` if there is no `alt` attribute, otherwise the value of the `alt` attribute.\n\t *\n\t * @readonly\n\t * @observable\n\t * @member {String|Boolean} #value\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst element = this.editor.model.document.selection.getSelectedElement();\n\n\t\tthis.isEnabled = isImage( element );\n\n\t\tif ( isImage( element ) && element.hasAttribute( 'alt' ) ) {\n\t\t\tthis.value = element.getAttribute( 'alt' );\n\t\t} else {\n\t\t\tthis.value = false;\n\t\t}\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * @fires execute\n\t * @param {Object} options\n\t * @param {String} options.newValue The new value of the `alt` attribute to set.\n\t */\n\texecute( options ) {\n\t\tconst model = this.editor.model;\n\t\tconst imageElement = model.document.selection.getSelectedElement();\n\n\t\tmodel.change( writer => {\n\t\t\twriter.setAttribute( 'alt', options.newValue, imageElement );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagetextalternative/imagetextalternativeediting\n */\n\nimport ImageTextAlternativeCommand from './imagetextalternativecommand';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * The image text alternative engine plugin.\n * Registers the `imageTextAlternative` command.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageTextAlternativeEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tthis.editor.commands.add( 'imageTextAlternative', new ImageTextAlternativeCommand( this.editor ) );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/labeledinput/labeledinputview\n */\n\nimport View from '../view';\nimport uid from '@ckeditor/ckeditor5-utils/src/uid';\n\nimport LabelView from '../label/labelview';\n\n/**\n * The labeled input view class.\n *\n * @extends module:ui/view~View\n */\nexport default class LabeledInputView extends View {\n\t/**\n\t * Creates an instance of the labeled input view class.\n\t *\n\t * @param {module:utils/locale~Locale} locale The locale instance.\n\t * @param {Function} InputView Constructor of the input view.\n\t */\n\tconstructor( locale, InputView ) {\n\t\tsuper( locale );\n\n\t\tconst id = `ck-input-${ uid() }`;\n\n\t\t/**\n\t\t * The text of the label.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #label\n\t\t */\n\t\tthis.set( 'label' );\n\n\t\t/**\n\t\t * The value of the input.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #value\n\t\t */\n\t\tthis.set( 'value' );\n\n\t\t/**\n\t\t * Controls whether the component is in read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * The label view.\n\t\t *\n\t\t * @member {module:ui/label/labelview~LabelView} #labelView\n\t\t */\n\t\tthis.labelView = this._createLabelView( id );\n\n\t\t/**\n\t\t * The input view.\n\t\t *\n\t\t * @member {module:ui/view~View} #inputView\n\t\t */\n\t\tthis.inputView = this._createInputView( InputView, id );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-labeled-input',\n\t\t\t\t\tbind.if( 'isReadOnly', 'ck-disabled' )\n\t\t\t\t]\n\t\t\t},\n\t\t\tchildren: [\n\t\t\t\tthis.labelView,\n\t\t\t\tthis.inputView\n\t\t\t]\n\t\t} );\n\t}\n\n\t/**\n\t * Creates label view class instance and bind with view.\n\t *\n\t * @private\n\t * @param {String} id Unique id to set as labelView#for attribute.\n\t * @returns {module:ui/label/labelview~LabelView}\n\t */\n\t_createLabelView( id ) {\n\t\tconst labelView = new LabelView( this.locale );\n\n\t\tlabelView.for = id;\n\t\tlabelView.bind( 'text' ).to( this, 'label' );\n\n\t\treturn labelView;\n\t}\n\n\t/**\n\t * Creates input view class instance and bind with view.\n\t *\n\t * @private\n\t * @param {Function} InputView Input view constructor.\n\t * @param {String} id Unique id to set as inputView#id attribute.\n\t * @returns {module:ui/inputtext/inputtextview~InputTextView}\n\t */\n\t_createInputView( InputView, id ) {\n\t\tconst inputView = new InputView( this.locale );\n\n\t\tinputView.id = id;\n\t\tinputView.bind( 'value' ).to( this );\n\t\tinputView.bind( 'isReadOnly' ).to( this );\n\n\t\treturn inputView;\n\t}\n\n\t/**\n\t * Moves the focus to the input and selects the value.\n\t */\n\tselect() {\n\t\tthis.inputView.select();\n\t}\n\n\t/**\n\t * Focuses the input.\n\t */\n\tfocus() {\n\t\tthis.inputView.focus();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/inputtext/inputtextview\n */\n\nimport View from '../view';\n\nimport '../../theme/components/inputtext/inputtext.css';\n\n/**\n * The text input view class.\n *\n * @extends module:ui/view~View\n */\nexport default class InputTextView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\t/**\n\t\t * The value of the input.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #value\n\t\t */\n\t\tthis.set( 'value' );\n\n\t\t/**\n\t\t * The `id` attribute of the input (i.e. to pair with a `<label>` element).\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #id\n\t\t */\n\t\tthis.set( 'id' );\n\n\t\t/**\n\t\t * The `placeholder` attribute of the input.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #placeholder\n\t\t */\n\t\tthis.set( 'placeholder' );\n\n\t\t/**\n\t\t * Controls whether the input view is in read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'input',\n\t\t\tattributes: {\n\t\t\t\ttype: 'text',\n\t\t\t\tclass: [\n\t\t\t\t\t'ck',\n\t\t\t\t\t'ck-input',\n\t\t\t\t\t'ck-input-text'\n\t\t\t\t],\n\t\t\t\tid: bind.to( 'id' ),\n\t\t\t\tplaceholder: bind.to( 'placeholder' ),\n\t\t\t\treadonly: bind.to( 'isReadOnly' )\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trender() {\n\t\tsuper.render();\n\n\t\tconst setValue = value => {\n\t\t\tthis.element.value = ( !value && value !== 0 ) ? '' : value;\n\t\t};\n\n\t\tsetValue( this.value );\n\n\t\t// Bind `this.value` to the DOM element's value.\n\t\t// We cannot use `value` DOM attribute because removing it on Edge does not clear the DOM element's value property.\n\t\tthis.on( 'change:value', ( evt, name, value ) => {\n\t\t\tsetValue( value );\n\t\t} );\n\t}\n\n\t/**\n\t * Moves the focus to the input and selects the value.\n\t */\n\tselect() {\n\t\tthis.element.select();\n\t}\n\n\t/**\n\t * Focuses the input.\n\t */\n\tfocus() {\n\t\tthis.element.focus();\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module ui/bindings/submithandler\n */\n\n/**\n * A handler useful for {@link module:ui/view~View views} working as HTML forms. It intercepts a native DOM\n * `submit` event, prevents the default web browser behavior (navigation and page reload) and\n * fires the `submit` event on a view instead. Such a custom event can be then used by any\n * {@link module:utils/dom/emittermixin~Emitter emitter}, e.g. to serialize the form data.\n *\n *\t\timport submitHandler from '@ckeditor/ckeditor5-ui/src/bindings/submithandler';\n *\n *\t\t// ...\n *\n *\t\tclass AnyFormView extends View {\n *\t\t\tconstructor() {\n *\t\t\t\tsuper();\n *\n *\t\t\t\t// ...\n *\n *\t\t\t\tsubmitHandler( {\n *\t\t\t\t\tview: this\n *\t\t\t\t} );\n *\t\t\t}\n *\t\t}\n *\n *\t\t// ...\n *\n *\t\tconst view = new AnyFormView();\n *\n *\t\t// A sample listener attached by an emitter working with the view.\n *\t\tthis.listenTo( view, 'submit', () => {\n *\t\t\tsaveTheFormData();\n *\t\t\thideTheForm();\n *\t\t} );\n *\n * @param {Object} [options] Configuration options.\n * @param {module:ui/view~View} options.view The view which DOM `submit` events should be handled.\n */\nexport default function submitHandler( { view } ) {\n\tview.listenTo( view.element, 'submit', ( evt, domEvt ) => {\n\t\tdomEvt.preventDefault();\n\t\tview.fire( 'submit' );\n\t}, { useCapture: true } );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imagetextalternative/ui/textalternativeformview\n */\nimport View from '@ckeditor/ckeditor5-ui/src/view';\nimport ViewCollection from '@ckeditor/ckeditor5-ui/src/viewcollection';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport LabeledInputView from '@ckeditor/ckeditor5-ui/src/labeledinput/labeledinputview';\nimport InputTextView from '@ckeditor/ckeditor5-ui/src/inputtext/inputtextview';\nimport submitHandler from '@ckeditor/ckeditor5-ui/src/bindings/submithandler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '@ckeditor/ckeditor5-ui/src/focuscycler';\nimport checkIcon from '@ckeditor/ckeditor5-core/theme/icons/check.svg';\nimport cancelIcon from '@ckeditor/ckeditor5-core/theme/icons/cancel.svg';\nimport '../../../theme/textalternativeform.css';\n/**\n * The TextAlternativeFormView class.\n *\n * @extends module:ui/view~View\n */\nexport default class TextAlternativeFormView extends View {\n    /**\n\t * @inheritDoc\n\t */\n    constructor(locale) {\n        super(locale);\n        const t = this.locale.t;\n        /**\n\t\t * Tracks information about the DOM focus in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n        this.focusTracker = new FocusTracker();\n        /**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n        this.keystrokes = new KeystrokeHandler();\n        /**\n\t\t * A textarea with a label.\n\t\t *\n\t\t * @member {module:ui/labeledinput/labeledinputview~LabeledInputView} #labeledTextarea\n\t\t */\n        this.labeledInput = this._createLabeledInputView();\n        /**\n\t\t * A button used to submit the form.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView} #saveButtonView\n\t\t */\n        this.saveButtonView = this._createButton(t('ap'), checkIcon, 'ck-button-save');\n        this.saveButtonView.type = 'submit';\n        /**\n\t\t * A button used to cancel the form.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView} #cancelButtonView\n\t\t */\n        this.cancelButtonView = this._createButton(t('aq'), cancelIcon, 'ck-button-cancel', 'cancel');\n        /**\n\t\t * A collection of views which can be focused in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n        this._focusables = new ViewCollection();\n        /**\n\t\t * Helps cycling over {@link #_focusables} in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n        this._focusCycler = new FocusCycler({\n            focusables: this._focusables,\n            focusTracker: this.focusTracker,\n            keystrokeHandler: this.keystrokes,\n            actions: {\n                // Navigate form fields backwards using the Shift + Tab keystroke.\n                focusPrevious: 'shift + tab',\n                // Navigate form fields forwards using the Tab key.\n                focusNext: 'tab'\n            }\n        });\n        this.setTemplate({\n            tag: 'form',\n            attributes: {\n                class: [\n                    'ck',\n                    'ck-text-alternative-form'\n                ],\n                // https://github.com/ckeditor/ckeditor5-image/issues/40\n                tabindex: '-1'\n            },\n            children: [\n                this.labeledInput,\n                this.saveButtonView,\n                this.cancelButtonView\n            ]\n        });\n    }\n    /**\n\t * @inheritDoc\n\t */\n    render() {\n        super.render();\n        this.keystrokes.listenTo(this.element);\n        submitHandler({ view: this });\n        [\n            this.labeledInput,\n            this.saveButtonView,\n            this.cancelButtonView\n        ].forEach(v => {\n            // Register the view as focusable.\n            this._focusables.add(v);\n            // Register the view in the focus tracker.\n            this.focusTracker.add(v.element);\n        });\n    }\n    /**\n\t * Creates the button view.\n\t *\n\t * @private\n\t * @param {String} label The button label\n\t * @param {String} icon The button's icon.\n\t * @param {String} className The additional button CSS class name.\n\t * @param {String} [eventName] The event name that the ButtonView#execute event will be delegated to.\n\t * @returns {module:ui/button/buttonview~ButtonView} The button view instance.\n\t */\n    _createButton(label, icon, className, eventName) {\n        const button = new ButtonView(this.locale);\n        button.set({\n            label,\n            icon,\n            tooltip: true\n        });\n        button.extendTemplate({ attributes: { class: className } });\n        if (eventName) {\n            button.delegate('execute').to(this, eventName);\n        }\n        return button;\n    }\n    /**\n\t * Creates an input with a label.\n\t *\n\t * @private\n\t * @returns {module:ui/labeledinput/labeledinputview~LabeledInputView}\n\t */\n    _createLabeledInputView() {\n        const t = this.locale.t;\n        const labeledInput = new LabeledInputView(this.locale, InputTextView);\n        labeledInput.label = t('as');\n        labeledInput.inputView.placeholder = t('as');\n        return labeledInput;\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/image/ui/utils\n */\n\nimport BalloonPanelView from '@ckeditor/ckeditor5-ui/src/panel/balloon/balloonpanelview';\nimport { isImageWidgetSelected } from '../utils';\n\n/**\n * A helper utility that positions the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} instance\n * with respect to the image in the editor content, if one is selected.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport function repositionContextualBalloon( editor ) {\n\tconst balloon = editor.plugins.get( 'ContextualBalloon' );\n\n\tif ( isImageWidgetSelected( editor.editing.view.document.selection ) ) {\n\t\tconst position = getBalloonPositionData( editor );\n\n\t\tballoon.updatePosition( position );\n\t}\n}\n\n/**\n * Returns the positioning options that control the geometry of the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} with respect\n * to the selected element in the editor content.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n * @returns {module:utils/dom/position~Options}\n */\nexport function getBalloonPositionData( editor ) {\n\tconst editingView = editor.editing.view;\n\tconst defaultPositions = BalloonPanelView.defaultPositions;\n\n\treturn {\n\t\ttarget: editingView.domConverter.viewToDom( editingView.document.selection.getSelectedElement() ),\n\t\tpositions: [\n\t\t\tdefaultPositions.northArrowSouth,\n\t\t\tdefaultPositions.northArrowSouthWest,\n\t\t\tdefaultPositions.northArrowSouthEast,\n\t\t\tdefaultPositions.southArrowNorth,\n\t\t\tdefaultPositions.southArrowNorthWest,\n\t\t\tdefaultPositions.southArrowNorthEast\n\t\t]\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imagetextalternative/imagetextalternativeui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport clickOutsideHandler from '@ckeditor/ckeditor5-ui/src/bindings/clickoutsidehandler';\nimport TextAlternativeFormView from './ui/textalternativeformview';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\nimport textAlternativeIcon from '@ckeditor/ckeditor5-core/theme/icons/low-vision.svg';\nimport {\n    repositionContextualBalloon,\n    getBalloonPositionData\n} from '../image/ui/utils';\nimport { isImageWidgetSelected } from '../image/utils';\n/**\n * The image text alternative UI plugin.\n *\n * The plugin uses the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageTextAlternativeUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    static get requires() {\n        return [ContextualBalloon];\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        this._createButton();\n        this._createForm();\n    }\n    /**\n\t * Creates a button showing the balloon panel for changing the image text alternative and\n\t * registers it in the editor {@link module:ui/componentfactory~ComponentFactory ComponentFactory}.\n\t *\n\t * @private\n\t */\n    _createButton() {\n        const editor = this.editor;\n        const t = editor.t;\n        editor.ui.componentFactory.add('imageTextAlternative', locale => {\n            const command = editor.commands.get('imageTextAlternative');\n            const view = new ButtonView(locale);\n            view.set({\n                label: t('ak'),\n                icon: textAlternativeIcon,\n                tooltip: true\n            });\n            view.bind('isEnabled').to(command, 'isEnabled');\n            this.listenTo(view, 'execute', () => this._showForm());\n            return view;\n        });\n    }\n    /**\n\t * Creates the {@link module:image/imagetextalternative/ui/textalternativeformview~TextAlternativeFormView}\n\t * form.\n\t *\n\t * @private\n\t */\n    _createForm() {\n        const editor = this.editor;\n        const view = editor.editing.view;\n        const viewDocument = view.document;\n        /**\n\t\t * The contextual balloon plugin instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:ui/panel/balloon/contextualballoon~ContextualBalloon}\n\t\t */\n        this._balloon = this.editor.plugins.get('ContextualBalloon');\n        /**\n\t\t * A form containing a textarea and buttons, used to change the `alt` text value.\n\t\t *\n\t\t * @member {module:image/imagetextalternative/ui/textalternativeformview~TextAlternativeFormView}\n\t\t */\n        this._form = new TextAlternativeFormView(editor.locale);\n        // Render the form so its #element is available for clickOutsideHandler.\n        this._form.render();\n        this.listenTo(this._form, 'submit', () => {\n            editor.execute('imageTextAlternative', { newValue: this._form.labeledInput.inputView.element.value });\n            this._hideForm(true);\n        });\n        this.listenTo(this._form, 'cancel', () => {\n            this._hideForm(true);\n        });\n        // Close the form on Esc key press.\n        this._form.keystrokes.set('Esc', (data, cancel) => {\n            this._hideForm(true);\n            cancel();\n        });\n        // Reposition the balloon or hide the form if an image widget is no longer selected.\n        this.listenTo(editor.ui, 'update', () => {\n            if (!isImageWidgetSelected(viewDocument.selection)) {\n                this._hideForm(true);\n            } else if (this._isVisible) {\n                repositionContextualBalloon(editor);\n            }\n        });\n        // Close on click outside of balloon panel element.\n        clickOutsideHandler({\n            emitter: this._form,\n            activator: () => this._isVisible,\n            contextElements: [this._form.element],\n            callback: () => this._hideForm()\n        });\n    }\n    /**\n\t * Shows the {@link #_form} in the {@link #_balloon}.\n\t *\n\t * @private\n\t */\n    _showForm() {\n        if (this._isVisible) {\n            return;\n        }\n        const editor = this.editor;\n        const command = editor.commands.get('imageTextAlternative');\n        const labeledInput = this._form.labeledInput;\n        if (!this._balloon.hasView(this._form)) {\n            this._balloon.add({\n                view: this._form,\n                position: getBalloonPositionData(editor)\n            });\n        }\n        // Make sure that each time the panel shows up, the field remains in sync with the value of\n        // the command. If the user typed in the input, then canceled the balloon (`labeledInput#value`\n        // stays unaltered) and re-opened it without changing the value of the command, they would see the\n        // old value instead of the actual value of the command.\n        // https://github.com/ckeditor/ckeditor5-image/issues/114\n        labeledInput.value = labeledInput.inputView.element.value = command.value || '';\n        this._form.labeledInput.select();\n    }\n    /**\n\t * Removes the {@link #_form} from the {@link #_balloon}.\n\t *\n\t * @param {Boolean} [focusEditable=false] Controls whether the editing view is focused afterwards.\n\t * @private\n\t */\n    _hideForm(focusEditable) {\n        if (!this._isVisible) {\n            return;\n        }\n        this._balloon.remove(this._form);\n        if (focusEditable) {\n            this.editor.editing.view.focus();\n        }\n    }\n    /**\n\t * Returns `true` when the {@link #_form} is the visible view in the {@link #_balloon}.\n\t *\n\t * @private\n\t * @type {Boolean}\n\t */\n    get _isVisible() {\n        return this._balloon.visibleView == this._form;\n    }\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagetextalternative\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageTextAlternativeEditing from './imagetextalternative/imagetextalternativeediting';\nimport ImageTextAlternativeUI from './imagetextalternative/imagetextalternativeui';\n\n/**\n * The image text alternative plugin.\n *\n * It loads the {@link module:image/imagetextalternative/imagetextalternativeediting~ImageTextAlternativeEditing}\n * and {@link module:image/imagetextalternative/imagetextalternativeui~ImageTextAlternativeUI} plugins.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageTextAlternative extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageTextAlternativeEditing, ImageTextAlternativeUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageTextAlternative';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/placeholder\n */\n\nimport '../../theme/placeholder.css';\n\n// Each document stores information about its placeholder elements and check functions.\nconst documentPlaceholders = new WeakMap();\n\n/**\n * Attaches placeholder to provided element and updates it's visibility. To change placeholder simply call this method\n * once again with new parameters.\n *\n * @param {module:engine/view/view~View} view View controller.\n * @param {module:engine/view/element~Element} element Element to attach placeholder to.\n * @param {String} placeholderText Placeholder text to use.\n * @param {Function} [checkFunction] If provided it will be called before checking if placeholder should be displayed.\n * If function returns `false` placeholder will not be showed.\n */\nexport function attachPlaceholder( view, element, placeholderText, checkFunction ) {\n\tconst document = view.document;\n\n\t// Single listener per document.\n\tif ( !documentPlaceholders.has( document ) ) {\n\t\tdocumentPlaceholders.set( document, new Map() );\n\n\t\t// Create view post-fixer that will add placeholder where needed.\n\t\tdocument.registerPostFixer( writer => updateAllPlaceholders( document, writer ) );\n\t}\n\n\t// Store information about element with placeholder.\n\tdocumentPlaceholders.get( document ).set( element, {\n\t\tplaceholderText,\n\t\tcheckFunction\n\t} );\n\n\t// Update view right away.\n\tview.render();\n}\n\n/**\n * Removes placeholder functionality from given element.\n *\n * @param {module:engine/view/view~View} view\n * @param {module:engine/view/element~Element} element\n */\nexport function detachPlaceholder( view, element ) {\n\tconst doc = element.document;\n\n\tview.change( writer => {\n\t\tif ( documentPlaceholders.has( doc ) ) {\n\t\t\tdocumentPlaceholders.get( doc ).delete( element );\n\t\t}\n\n\t\twriter.removeClass( 'ck-placeholder', element );\n\t\twriter.removeAttribute( 'data-placeholder', element );\n\t} );\n}\n\n// Updates all placeholders of given document.\n//\n// @private\n// @param {module:engine/view/document~Document} view\n// @param {module:engine/view/writer~Writer} writer\nfunction updateAllPlaceholders( document, writer ) {\n\tconst placeholders = documentPlaceholders.get( document );\n\tlet changed = false;\n\n\tfor ( const [ element, info ] of placeholders ) {\n\t\tif ( updateSinglePlaceholder( writer, element, info ) ) {\n\t\t\tchanged = true;\n\t\t}\n\t}\n\n\treturn changed;\n}\n\n// Updates placeholder class of given element.\n//\n// @private\n// @param {module:engine/view/writer~Writer} writer\n// @param {module:engine/view/element~Element} element\n// @param {Object} info\nfunction updateSinglePlaceholder( writer, element, info ) {\n\tconst document = element.document;\n\tconst text = info.placeholderText;\n\tlet changed = false;\n\n\t// Element was removed from document.\n\tif ( !document ) {\n\t\treturn false;\n\t}\n\n\t// Update data attribute if needed.\n\tif ( element.getAttribute( 'data-placeholder' ) !== text ) {\n\t\twriter.setAttribute( 'data-placeholder', text, element );\n\t\tchanged = true;\n\t}\n\n\tconst viewSelection = document.selection;\n\tconst anchor = viewSelection.anchor;\n\tconst checkFunction = info.checkFunction;\n\n\t// If checkFunction is provided and returns false - remove placeholder.\n\tif ( checkFunction && !checkFunction() ) {\n\t\tif ( element.hasClass( 'ck-placeholder' ) ) {\n\t\t\twriter.removeClass( 'ck-placeholder', element );\n\t\t\tchanged = true;\n\t\t}\n\n\t\treturn changed;\n\t}\n\n\t// Element is empty for placeholder purposes when it has no children or only ui elements.\n\t// This check is taken from `view.ContainerElement#getFillerOffset`.\n\tconst isEmptyish = !Array.from( element.getChildren() ).some( element => !element.is( 'uiElement' ) );\n\n\t// If element is empty and editor is blurred.\n\tif ( !document.isFocused && isEmptyish ) {\n\t\tif ( !element.hasClass( 'ck-placeholder' ) ) {\n\t\t\twriter.addClass( 'ck-placeholder', element );\n\t\t\tchanged = true;\n\t\t}\n\n\t\treturn changed;\n\t}\n\n\t// It there are no child elements and selection is not placed inside element.\n\tif ( isEmptyish && anchor && anchor.parent !== element ) {\n\t\tif ( !element.hasClass( 'ck-placeholder' ) ) {\n\t\t\twriter.addClass( 'ck-placeholder', element );\n\t\t\tchanged = true;\n\t\t}\n\t} else {\n\t\tif ( element.hasClass( 'ck-placeholder' ) ) {\n\t\t\twriter.removeClass( 'ck-placeholder', element );\n\t\t\tchanged = true;\n\t\t}\n\t}\n\n\treturn changed;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagecaption/utils\n */\n\nimport ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';\nimport { attachPlaceholder } from '@ckeditor/ckeditor5-engine/src/view/placeholder';\nimport { toWidgetEditable } from '@ckeditor/ckeditor5-widget/src/utils';\n\nconst captionSymbol = Symbol( 'imageCaption' );\n\n/**\n * Returns a function that creates a caption editable element for the given {@link module:engine/view/document~Document}.\n *\n * @param {module:engine/view/view~View} view\n * @param {String} placeholderText The text to be displayed when the caption is empty.\n * @returns {Function}\n */\nexport function captionElementCreator( view, placeholderText ) {\n\treturn writer => {\n\t\tconst editable = writer.createEditableElement( 'figcaption' );\n\t\twriter.setCustomProperty( captionSymbol, true, editable );\n\t\tattachPlaceholder( view, editable, placeholderText );\n\n\t\treturn toWidgetEditable( editable, writer );\n\t};\n}\n\n/**\n * Returns `true` if a given view element is the image caption editable.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @returns {Boolean}\n */\nexport function isCaption( viewElement ) {\n\treturn !!viewElement.getCustomProperty( captionSymbol );\n}\n\n/**\n * Returns the caption model element from a given image element. Returns `null` if no caption is found.\n *\n * @param {module:engine/model/element~Element} imageModelElement\n * @returns {module:engine/model/element~Element|null}\n */\nexport function getCaptionFromImage( imageModelElement ) {\n\tfor ( const node of imageModelElement.getChildren() ) {\n\t\tif ( node instanceof ModelElement && node.name == 'caption' ) {\n\t\t\treturn node;\n\t\t}\n\t}\n\n\treturn null;\n}\n\n/**\n * {@link module:engine/view/matcher~Matcher} pattern. Checks if a given element is a `<figcaption>` element that is placed\n * inside the image `<figure>` element.\n *\n * @param {module:engine/view/element~Element} element\n * @returns {Object|null} Returns the object accepted by {@link module:engine/view/matcher~Matcher} or `null` if the element\n * cannot be matched.\n */\nexport function matchImageCaption( element ) {\n\tconst parent = element.parent;\n\n\t// Convert only captions for images.\n\tif ( element.name == 'figcaption' && parent && parent.name == 'figure' && parent.hasClass( 'image' ) ) {\n\t\treturn { name: true };\n\t}\n\n\treturn null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imagecaption/imagecaptionediting\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport { upcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport { isImage } from '../image/utils';\nimport {\n    captionElementCreator,\n    getCaptionFromImage,\n    matchImageCaption\n} from './utils';\n/**\n * The image caption engine plugin.\n *\n * It registers proper converters. It takes care of adding a caption element if the image without it is inserted\n * to the model document.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageCaptionEditing extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const view = editor.editing.view;\n        const schema = editor.model.schema;\n        const data = editor.data;\n        const editing = editor.editing;\n        const t = editor.t;\n        /**\n\t\t * The last selected caption editable.\n\t\t * It is used for hiding the editable when it is empty and the image widget is no longer selected.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/editableelement~EditableElement} #_lastSelectedCaption\n\t\t */\n        // Schema configuration.\n        schema.register('caption', {\n            allowIn: 'image',\n            allowContentOf: '$block',\n            isLimit: true\n        });\n        // Add caption element to each image inserted without it.\n        editor.model.document.registerPostFixer(writer => this._insertMissingModelCaptionElement(writer));\n        // View to model converter for the data pipeline.\n        editor.conversion.for('upcast').add(upcastElementToElement({\n            view: matchImageCaption,\n            model: 'caption'\n        }));\n        // Model to view converter for the data pipeline.\n        const createCaptionForData = writer => writer.createContainerElement('figcaption');\n        data.downcastDispatcher.on('insert:caption', captionModelToView(createCaptionForData, false));\n        // Model to view converter for the editing pipeline.\n        const createCaptionForEditing = captionElementCreator(view, t('ad'));\n        editing.downcastDispatcher.on('insert:caption', captionModelToView(createCaptionForEditing));\n        // Always show caption in view when something is inserted in model.\n        editing.downcastDispatcher.on('insert', this._fixCaptionVisibility(data => data.item), { priority: 'high' });\n        // Hide caption when everything is removed from it.\n        editing.downcastDispatcher.on('remove', this._fixCaptionVisibility(data => data.position.parent), { priority: 'high' });\n        // Update caption visibility on view in post fixer.\n        view.document.registerPostFixer(writer => this._updateCaptionVisibility(writer));\n    }\n    /**\n\t * Updates the view before each rendering, making sure that empty captions (so unnecessary ones) are hidden\n\t * and then visible when the image is selected.\n\t *\n\t * @private\n\t * @param {module:engine/view/writer~Writer} viewWriter\n\t * @returns {Boolean} Returns `true` when the view is updated.\n\t */\n    _updateCaptionVisibility(viewWriter) {\n        const mapper = this.editor.editing.mapper;\n        const lastCaption = this._lastSelectedCaption;\n        let viewCaption;\n        // If whole image is selected.\n        const modelSelection = this.editor.model.document.selection;\n        const selectedElement = modelSelection.getSelectedElement();\n        if (selectedElement && selectedElement.is('image')) {\n            const modelCaption = getCaptionFromImage(selectedElement);\n            viewCaption = mapper.toViewElement(modelCaption);\n        }\n        // If selection is placed inside caption.\n        const position = modelSelection.getFirstPosition();\n        const modelCaption = getParentCaption(position.parent);\n        if (modelCaption) {\n            viewCaption = mapper.toViewElement(modelCaption);\n        }\n        // Is currently any caption selected?\n        if (viewCaption) {\n            // Was any caption selected before?\n            if (lastCaption) {\n                // Same caption as before?\n                if (lastCaption === viewCaption) {\n                    return showCaption(viewCaption, viewWriter);\n                } else {\n                    hideCaptionIfEmpty(lastCaption, viewWriter);\n                    this._lastSelectedCaption = viewCaption;\n                    return showCaption(viewCaption, viewWriter);\n                }\n            } else {\n                this._lastSelectedCaption = viewCaption;\n                return showCaption(viewCaption, viewWriter);\n            }\n        } else {\n            // Was any caption selected before?\n            if (lastCaption) {\n                const viewModified = hideCaptionIfEmpty(lastCaption, viewWriter);\n                this._lastSelectedCaption = null;\n                return viewModified;\n            } else {\n                return false;\n            }\n        }\n    }\n    /**\n\t * Returns a converter that fixes caption visibility during the model-to-view conversion.\n\t * Checks if the changed node is placed inside the caption element and fixes its visibility in the view.\n\t *\n\t * @private\n\t * @param {Function} nodeFinder\n\t * @returns {Function}\n\t */\n    _fixCaptionVisibility(nodeFinder) {\n        return (evt, data, conversionApi) => {\n            const node = nodeFinder(data);\n            const modelCaption = getParentCaption(node);\n            const mapper = this.editor.editing.mapper;\n            const viewWriter = conversionApi.writer;\n            if (modelCaption) {\n                const viewCaption = mapper.toViewElement(modelCaption);\n                if (viewCaption) {\n                    if (modelCaption.childCount) {\n                        viewWriter.removeClass('ck-hidden', viewCaption);\n                    } else {\n                        viewWriter.addClass('ck-hidden', viewCaption);\n                    }\n                }\n            }\n        };\n    }\n    /**\n\t * Checks whether the data inserted to the model document have an image element that has no caption element inside it.\n\t * If there is none, it adds it to the image element.\n\t *\n\t * @private\n\t * @param {module:engine/model/writer~Writer} writer The writer to make changes with.\n\t * @returns {Boolean} `true` if any change was applied, `false` otherwise.\n\t */\n    _insertMissingModelCaptionElement(writer) {\n        const model = this.editor.model;\n        const changes = model.document.differ.getChanges();\n        for (const entry of changes) {\n            if (entry.type == 'insert' && entry.name == 'image') {\n                const item = entry.position.nodeAfter;\n                if (!getCaptionFromImage(item)) {\n                    writer.appendElement('caption', item);\n                    return true;\n                }\n            }\n        }\n    }\n}\n// Creates a converter that converts image caption model element to view element.\n//\n// @private\n// @param {Function} elementCreator\n// @param {Boolean} [hide=true] When set to `false` view element will not be inserted when it's empty.\n// @returns {Function}\nfunction captionModelToView(elementCreator, hide = true) {\n    return (evt, data, conversionApi) => {\n        const captionElement = data.item;\n        // Return if element shouldn't be present when empty.\n        if (!captionElement.childCount && !hide) {\n            return;\n        }\n        if (isImage(captionElement.parent)) {\n            if (!conversionApi.consumable.consume(data.item, 'insert')) {\n                return;\n            }\n            const viewImage = conversionApi.mapper.toViewElement(data.range.start.parent);\n            const viewCaption = elementCreator(conversionApi.writer);\n            const viewWriter = conversionApi.writer;\n            // Hide if empty.\n            if (!captionElement.childCount) {\n                viewWriter.addClass('ck-hidden', viewCaption);\n            }\n            insertViewCaptionAndBind(viewCaption, data.item, viewImage, conversionApi);\n        }\n    };\n}\n// Inserts `viewCaption` at the end of `viewImage` and binds it to `modelCaption`.\n//\n// @private\n// @param {module:engine/view/containerelement~ContainerElement} viewCaption\n// @param {module:engine/model/element~Element} modelCaption\n// @param {module:engine/view/containerelement~ContainerElement} viewImage\n// @param {Object} conversionApi\nfunction insertViewCaptionAndBind(viewCaption, modelCaption, viewImage, conversionApi) {\n    const viewPosition = ViewPosition.createAt(viewImage, 'end');\n    conversionApi.writer.insert(viewPosition, viewCaption);\n    conversionApi.mapper.bindElements(modelCaption, viewCaption);\n}\n// Checks if the provided node or one of its ancestors is a caption element, and returns it.\n//\n// @private\n// @param {module:engine/model/node~Node} node\n// @returns {module:engine/model/element~Element|null}\nfunction getParentCaption(node) {\n    const ancestors = node.getAncestors({ includeSelf: true });\n    const caption = ancestors.find(ancestor => ancestor.name == 'caption');\n    if (caption && caption.parent && caption.parent.name == 'image') {\n        return caption;\n    }\n    return null;\n}\n// Hides a given caption in the view if it is empty.\n//\n// @private\n// @param {module:engine/view/containerelement~ContainerElement} caption\n// @param {module:engine/view/writer~Writer} viewWriter\n// @returns {Boolean} Returns `true` if the view was modified.\nfunction hideCaptionIfEmpty(caption, viewWriter) {\n    if (!caption.childCount && !caption.hasClass('ck-hidden')) {\n        viewWriter.addClass('ck-hidden', caption);\n        return true;\n    }\n    return false;\n}\n// Shows the caption.\n//\n// @private\n// @param {module:engine/view/containerelement~ContainerElement} caption\n// @param {module:engine/view/writer~Writer} viewWriter\n// @returns {Boolean} Returns `true` if the view was modified.\nfunction showCaption(caption, viewWriter) {\n    if (caption.hasClass('ck-hidden')) {\n        viewWriter.removeClass('ck-hidden', caption);\n        return true;\n    }\n    return false;\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagestyle/imagestylecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { isImage } from '../image/utils';\n\n/**\n * The image style command. It is used to apply different image styles.\n *\n * @extends module:core/command~Command\n */\nexport default class ImageStyleCommand extends Command {\n\t/**\n\t * Creates an instance of the image style command. Each command instance is handling one style.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>} styles The styles that this command supports.\n\t */\n\tconstructor( editor, styles ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The cached name of the default style if it is present. If there is no default style, it defaults to `false`.\n\t\t *\n\t\t * @type {Boolean|String}\n\t\t * @private\n\t\t */\n\t\tthis._defaultStyle = false;\n\n\t\t/**\n\t\t * A style handled by this command.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>} #styles\n\t\t */\n\t\tthis.styles = styles.reduce( ( styles, style ) => {\n\t\t\tstyles[ style.name ] = style;\n\n\t\t\tif ( style.isDefault ) {\n\t\t\t\tthis._defaultStyle = style.name;\n\t\t\t}\n\n\t\t\treturn styles;\n\t\t}, {} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst element = this.editor.model.document.selection.getSelectedElement();\n\n\t\tthis.isEnabled = isImage( element );\n\n\t\tif ( !element ) {\n\t\t\tthis.value = false;\n\t\t} else if ( element.hasAttribute( 'imageStyle' ) ) {\n\t\t\tconst attributeValue = element.getAttribute( 'imageStyle' );\n\t\t\tthis.value = this.styles[ attributeValue ] ? attributeValue : false;\n\t\t} else {\n\t\t\tthis.value = this._defaultStyle;\n\t\t}\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t *\t\teditor.execute( 'imageStyle', { value: 'side' } );\n\t *\n\t * @param {Object} options\n\t * @param {String} options.value The name of the style (based on the\n\t * {@link module:image/image~ImageConfig#styles `image.styles`} configuration option).\n\t * @fires execute\n\t */\n\texecute( options ) {\n\t\tconst styleName = options.value;\n\n\t\tconst model = this.editor.model;\n\t\tconst imageElement = model.document.selection.getSelectedElement();\n\n\t\tmodel.change( writer => {\n\t\t\t// Default style means that there is no `imageStyle` attribute in the model.\n\t\t\t// https://github.com/ckeditor/ckeditor5-image/issues/147\n\t\t\tif ( this.styles[ styleName ].isDefault ) {\n\t\t\t\twriter.removeAttribute( 'imageStyle', imageElement );\n\t\t\t} else {\n\t\t\t\twriter.setAttribute( 'imageStyle', styleName, imageElement );\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * @module image/imagestyle/converters\n */\n\n/**\n * Returns a converter for the `imageStyle` attribute. It can be used for adding, changing and removing the attribute.\n *\n * @param {Object} styles An object containing available styles. See {@link module:image/imagestyle/imagestyleediting~ImageStyleFormat}\n * for more details.\n * @returns {Function} A model-to-view attribute converter.\n */\nexport function modelToViewStyleAttribute( styles ) {\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Check if there is class name associated with given value.\n\t\tconst newStyle = getStyleByName( data.attributeNewValue, styles );\n\t\tconst oldStyle = getStyleByName( data.attributeOldValue, styles );\n\n\t\tconst viewElement = conversionApi.mapper.toViewElement( data.item );\n\t\tconst viewWriter = conversionApi.writer;\n\n\t\tif ( oldStyle ) {\n\t\t\tviewWriter.removeClass( oldStyle.className, viewElement );\n\t\t}\n\n\t\tif ( newStyle ) {\n\t\t\tviewWriter.addClass( newStyle.className, viewElement );\n\t\t}\n\t};\n}\n\n/**\n * Returns a view-to-model converter converting image CSS classes to a proper value in the model.\n *\n * @param {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>} styles The styles for which the converter is created.\n * @returns {Function} A view-to-model converter.\n */\nexport function viewToModelStyleAttribute( styles ) {\n\t// Convert only non–default styles.\n\tconst filteredStyles = styles.filter( style => !style.isDefault );\n\n\treturn ( evt, data, conversionApi ) => {\n\t\tif ( !data.modelRange ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst viewFigureElement = data.viewItem;\n\t\tconst modelImageElement = first( data.modelRange.getItems() );\n\n\t\t// Check if `imageStyle` attribute is allowed for current element.\n\t\tif ( !conversionApi.schema.checkAttribute( modelImageElement, 'imageStyle' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Convert style one by one.\n\t\tfor ( const style of filteredStyles ) {\n\t\t\t// Try to consume class corresponding with style.\n\t\t\tif ( conversionApi.consumable.consume( viewFigureElement, { classes: style.className } ) ) {\n\t\t\t\t// And convert this style to model attribute.\n\t\t\t\tconversionApi.writer.setAttribute( 'imageStyle', style.name, modelImageElement );\n\t\t\t}\n\t\t}\n\t};\n}\n\n// Returns the style with a given `name` from an array of styles.\n//\n// @param {String} name\n// @param {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat> } styles\n// @returns {module:image/imagestyle/imagestyleediting~ImageStyleFormat|undefined}\nfunction getStyleByName( name, styles ) {\n\tfor ( const style of styles ) {\n\t\tif ( style.name === name ) {\n\t\t\treturn style;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagestyle/utils\n */\n\nimport log from '@ckeditor/ckeditor5-utils/src/log';\n\nimport fullWidthIcon from '@ckeditor/ckeditor5-core/theme/icons/object-full-width.svg';\nimport leftIcon from '@ckeditor/ckeditor5-core/theme/icons/object-left.svg';\nimport centerIcon from '@ckeditor/ckeditor5-core/theme/icons/object-center.svg';\nimport rightIcon from '@ckeditor/ckeditor5-core/theme/icons/object-right.svg';\n\n/**\n * Default image styles provided by the plugin that can be referred in the\n * {@link module:image/image~ImageConfig#styles} configuration.\n *\n * Among them, 2 default semantic content styles are available:\n *\n * * `full` is a full–width image without any CSS class,\n * * `side` is a side image styled with the `image-style-side` CSS class.\n *\n * There are also 3 styles focused on formatting:\n *\n * * `alignLeft` aligns the image to the left using the `image-style-align-left` class,\n * * `alignCenter` centers the image using the `image-style-align-center` class,\n * * `alignRight` aligns the image to the right using the `image-style-align-right` class,\n *\n * @member {Object.<String,Object>}\n */\nconst defaultStyles = {\n\t// This option is equal to the situation when no style is applied.\n\tfull: {\n\t\tname: 'full',\n\t\ttitle: 'Full size image',\n\t\ticon: fullWidthIcon,\n\t\tisDefault: true\n\t},\n\n\t// This represents a side image.\n\tside: {\n\t\tname: 'side',\n\t\ttitle: 'Side image',\n\t\ticon: rightIcon,\n\t\tclassName: 'image-style-side'\n\t},\n\n\t// This style represents an image aligned to the left.\n\talignLeft: {\n\t\tname: 'alignLeft',\n\t\ttitle: 'Left aligned image',\n\t\ticon: leftIcon,\n\t\tclassName: 'image-style-align-left'\n\t},\n\n\t// This style represents a centered image.\n\talignCenter: {\n\t\tname: 'alignCenter',\n\t\ttitle: 'Centered image',\n\t\ticon: centerIcon,\n\t\tclassName: 'image-style-align-center'\n\t},\n\n\t// This style represents an image aligned to the right.\n\talignRight: {\n\t\tname: 'alignRight',\n\t\ttitle: 'Right aligned image',\n\t\ticon: rightIcon,\n\t\tclassName: 'image-style-align-right'\n\t}\n};\n\n/**\n * Default image style icons provided by the plugin that can be referred in the\n * {@link module:image/image~ImageConfig#styles} configuration.\n *\n * There are 4 icons available: `'full'`, `'left'`, `'center'` and `'right'`.\n *\n * @member {Object.<String, String>}\n */\nconst defaultIcons = {\n\tfull: fullWidthIcon,\n\tleft: leftIcon,\n\tright: rightIcon,\n\tcenter: centerIcon\n};\n\n/**\n * Returns a {@link module:image/image~ImageConfig#styles} array with items normalized in the\n * {@link module:image/imagestyle/imagestyleediting~ImageStyleFormat} format and a complete `icon` markup for each style.\n *\n * @returns {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>}\n */\nexport function normalizeImageStyles( configuredStyles = [] ) {\n\treturn configuredStyles\n\t\t.map( _normalizeStyle )\n\t\t.map( style => Object.assign( {}, style ) );\n}\n\n// Normalizes an image style provided in the {@link module:image/image~ImageConfig#styles}\n// and returns it in a {@link module:image/imagestyle/imagestyleediting~ImageStyleFormat}.\n//\n// @param {Object} style\n// @returns {@link module:image/imagestyle/imagestyleediting~ImageStyleFormat}\nfunction _normalizeStyle( style ) {\n\t// Just the name of the style has been passed.\n\tif ( typeof style == 'string' ) {\n\t\tconst styleName = style;\n\n\t\t// If it's one of the defaults, just use it.\n\t\tif ( defaultStyles[ styleName ] ) {\n\t\t\t// Clone the style to avoid overriding defaults.\n\t\t\tstyle = Object.assign( {}, defaultStyles[ styleName ] );\n\t\t}\n\t\t// If it's just a name but none of the defaults, warn because probably it's a mistake.\n\t\telse {\n\t\t\tlog.warn(\n\t\t\t\t'image-style-not-found: There is no such image style of given name.',\n\t\t\t\t{ name: styleName }\n\t\t\t);\n\n\t\t\t// Normalize the style anyway to prevent errors.\n\t\t\tstyle = {\n\t\t\t\tname: styleName\n\t\t\t};\n\t\t}\n\t}\n\t// If an object style has been passed and if the name matches one of the defaults,\n\t// extend it with defaults – the user wants to customize a default style.\n\t// Note: Don't override the user–defined style object, clone it instead.\n\telse if ( defaultStyles[ style.name ] ) {\n\t\tconst defaultStyle = defaultStyles[ style.name ];\n\t\tconst extendedStyle = Object.assign( {}, style );\n\n\t\tfor ( const prop in defaultStyle ) {\n\t\t\tif ( !style.hasOwnProperty( prop ) ) {\n\t\t\t\textendedStyle[ prop ] = defaultStyle[ prop ];\n\t\t\t}\n\t\t}\n\n\t\tstyle = extendedStyle;\n\t}\n\n\t// If an icon is defined as a string and correspond with a name\n\t// in default icons, use the default icon provided by the plugin.\n\tif ( typeof style.icon == 'string' && defaultIcons[ style.icon ] ) {\n\t\tstyle.icon = defaultIcons[ style.icon ];\n\t}\n\n\treturn style;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagestyle/imagestyleediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageStyleCommand from './imagestylecommand';\nimport ImageEditing from '../image/imageediting';\nimport { viewToModelStyleAttribute, modelToViewStyleAttribute } from './converters';\nimport { normalizeImageStyles } from './utils';\n\n/**\n * The image style engine plugin. It sets the default configuration, creates converters and registers\n * {@link module:image/imagestyle/imagestylecommand~ImageStyleCommand ImageStyleCommand}.\n *\n * @extends {module:core/plugin~Plugin}\n */\nexport default class ImageStyleEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageEditing ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageStyleEditing';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst data = editor.data;\n\t\tconst editing = editor.editing;\n\n\t\t// Define default configuration.\n\t\teditor.config.define( 'image.styles', [ 'full', 'side' ] );\n\n\t\t// Get configuration.\n\t\tconst styles = normalizeImageStyles( editor.config.get( 'image.styles' ) );\n\n\t\t// Allow imageStyle attribute in image.\n\t\t// We could call it 'style' but https://github.com/ckeditor/ckeditor5-engine/issues/559.\n\t\tschema.extend( 'image', { allowAttributes: 'imageStyle' } );\n\n\t\t// Converters for imageStyle attribute from model to view.\n\t\tconst modelToViewConverter = modelToViewStyleAttribute( styles );\n\t\tediting.downcastDispatcher.on( 'attribute:imageStyle:image', modelToViewConverter );\n\t\tdata.downcastDispatcher.on( 'attribute:imageStyle:image', modelToViewConverter );\n\n\t\t// Converter for figure element from view to model.\n\t\tdata.upcastDispatcher.on( 'element:figure', viewToModelStyleAttribute( styles ), { priority: 'low' } );\n\n\t\t// Register imageStyle command.\n\t\teditor.commands.add( 'imageStyle', new ImageStyleCommand( editor, styles ) );\n\t}\n}\n\n/**\n * The image style format descriptor.\n *\n *\t\timport fullSizeIcon from 'path/to/icon.svg';\n *\n *\t\tconst imageStyleFormat = {\n *\t\t\tname: 'fullSize',\n *\t\t\ticon: fullSizeIcon,\n *\t\t\ttitle: 'Full size image',\n *\t\t\tclassName: 'image-full-size'\n *\t\t}\n *\n * @typedef {Object} module:image/imagestyle/imagestyleediting~ImageStyleFormat\n *\n * @property {String} name The unique name of the style. It will be used to:\n *\n * * Store the chosen style in the model by setting the `imageStyle` attribute of the `<image>` element.\n * * As a value of the {@link module:image/imagestyle/imagestylecommand~ImageStyleCommand#execute `imageStyle` command},\n * * when registering a button for each of the styles (`'imageStyle:{name}'`) in the\n * {@link module:ui/componentfactory~ComponentFactory UI components factory} (this functionality is provided by the\n * {@link module:image/imagestyle/imagestyleui~ImageStyleUI} plugin).\n *\n * @property {Boolean} [isDefault] When set, the style will be used as the default one.\n * A default style does not apply any CSS class to the view element.\n *\n * @property {String} icon One of the following to be used when creating the style's button:\n *\n * * An SVG icon source (as an XML string).\n * * One of {@link module:image/imagestyle/utils~defaultIcons} to use a default icon provided by the plugin.\n *\n * @property {String} title The style's title.\n *\n * @property {String} className The CSS class used to represent the style in the view.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module image/imagestyle/imagestyleui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport { normalizeImageStyles } from './utils';\nimport '../../theme/imagestyle.css';\n/**\n * The image style UI plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageStyleUI extends Plugin {\n    /**\n\t * Returns the default localized style titles provided by the plugin.\n\t *\n\t * The following localized titles corresponding with\n\t * {@link module:image/imagestyle/utils~defaultStyles} are available:\n\t *\n\t * * `'Full size image'`,\n\t * * `'Side image'`,\n\t * * `'Left aligned image'`,\n\t * * `'Centered image'`,\n\t * * `'Right aligned image'`\n\t *\n\t * @returns {Object.<String,String>}\n\t */\n    get localizedDefaultStylesTitles() {\n        const t = this.editor.t;\n        return {\n            'Full size image': t('y'),\n            'Side image': t('z'),\n            'Left aligned image': t('aa'),\n            'Centered image': t('ab'),\n            'Right aligned image': t('ac')\n        };\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const configuredStyles = editor.config.get('image.styles');\n        const translatedStyles = translateStyles(normalizeImageStyles(configuredStyles), this.localizedDefaultStylesTitles);\n        for (const style of translatedStyles) {\n            this._createButton(style);\n        }\n    }\n    /**\n\t * Creates a button for each style and stores it in the editor {@link module:ui/componentfactory~ComponentFactory ComponentFactory}.\n\t *\n\t * @private\n\t * @param {module:image/imagestyle/imagestyleediting~ImageStyleFormat} style\n\t */\n    _createButton(style) {\n        const editor = this.editor;\n        const componentName = `imageStyle:${ style.name }`;\n        editor.ui.componentFactory.add(componentName, locale => {\n            const command = editor.commands.get('imageStyle');\n            const view = new ButtonView(locale);\n            view.set({\n                label: style.title,\n                icon: style.icon,\n                tooltip: true\n            });\n            view.bind('isEnabled').to(command, 'isEnabled');\n            view.bind('isOn').to(command, 'value', value => value === style.name);\n            this.listenTo(view, 'execute', () => editor.execute('imageStyle', { value: style.name }));\n            return view;\n        });\n    }\n}\n/**\n * Returns the translated `title` from the passed styles array.\n *\n * @param {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>} styles\n * @param titles\n * @returns {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>}\n */\nfunction translateStyles(styles, titles) {\n    for (const style of styles) {\n        // Localize the titles of the styles, if a title corresponds with\n        // a localized default provided by the plugin.\n        if (titles[style.title]) {\n            style.title = titles[style.title];\n        }\n    }\n    return styles;\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagetoolbar\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ToolbarView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarview';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\nimport { isImageWidgetSelected } from './image/utils';\nimport { repositionContextualBalloon, getBalloonPositionData } from './image/ui/utils';\n\nconst balloonClassName = 'ck-toolbar-container';\n\n/**\n * The image toolbar class. Creates an image toolbar that shows up when the image widget is selected.\n *\n * Toolbar components are created using the editor {@link module:ui/componentfactory~ComponentFactory ComponentFactory}\n * based on the {@link module:core/editor/editor~Editor#config configuration} stored under `image.toolbar`.\n *\n * The toolbar uses the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon}.\n *\n * For a detailed overview, check the {@glink features/image#image-contextual-toolbar image contextual toolbar} documentation.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageToolbar extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageToolbar';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst balloonToolbar = editor.plugins.get( 'BalloonToolbar' );\n\n\t\t// If the `BalloonToolbar` plugin is loaded, it should be disabled for images\n\t\t// which have their own toolbar to avoid duplication.\n\t\t// https://github.com/ckeditor/ckeditor5-image/issues/110\n\t\tif ( balloonToolbar ) {\n\t\t\tthis.listenTo( balloonToolbar, 'show', evt => {\n\t\t\t\tif ( isImageWidgetSelected( editor.editing.view.document.selection ) ) {\n\t\t\t\t\tevt.stop();\n\t\t\t\t}\n\t\t\t}, { priority: 'high' } );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tafterInit() {\n\t\tconst editor = this.editor;\n\t\tconst toolbarConfig = editor.config.get( 'image.toolbar' );\n\n\t\t// Don't add the toolbar if there is no configuration.\n\t\tif ( !toolbarConfig || !toolbarConfig.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\t/**\n\t\t * A contextual balloon plugin instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:ui/panel/balloon/contextualballoon~ContextualBalloon}\n\t\t */\n\t\tthis._balloon = this.editor.plugins.get( 'ContextualBalloon' );\n\n\t\t/**\n\t\t * A `ToolbarView` instance used to display the buttons specific for image editing.\n\t\t *\n\t\t * @protected\n\t\t * @type {module:ui/toolbar/toolbarview~ToolbarView}\n\t\t */\n\t\tthis._toolbar = new ToolbarView();\n\n\t\t// Add buttons to the toolbar.\n\t\tthis._toolbar.fillFromConfig( toolbarConfig, editor.ui.componentFactory );\n\n\t\t// Show balloon panel each time image widget is selected.\n\t\tthis.listenTo( editor.ui, 'update', () => {\n\t\t\tthis._checkIsVisible();\n\t\t} );\n\n\t\t// UI#update is not fired after focus is back in editor, we need to check if balloon panel should be visible.\n\t\tthis.listenTo( editor.ui.focusTracker, 'change:isFocused', () => {\n\t\t\tthis._checkIsVisible();\n\t\t}, { priority: 'low' } );\n\t}\n\n\t/**\n\t * Checks whether the toolbar should show up or hide depending on the current selection.\n\t *\n\t * @private\n\t */\n\t_checkIsVisible() {\n\t\tconst editor = this.editor;\n\n\t\tif ( !editor.ui.focusTracker.isFocused || !isImageWidgetSelected( editor.editing.view.document.selection ) ) {\n\t\t\tthis._hideToolbar();\n\t\t} else {\n\t\t\tthis._showToolbar();\n\t\t}\n\t}\n\n\t/**\n\t * Shows the {@link #_toolbar} in the {@link #_balloon}.\n\t *\n\t * @private\n\t */\n\t_showToolbar() {\n\t\tconst editor = this.editor;\n\n\t\tif ( this._isVisible ) {\n\t\t\trepositionContextualBalloon( editor );\n\t\t} else if ( !this._balloon.hasView( this._toolbar ) ) {\n\t\t\tthis._balloon.add( {\n\t\t\t\tview: this._toolbar,\n\t\t\t\tposition: getBalloonPositionData( editor ),\n\t\t\t\tballoonClassName\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Removes the {@link #_toolbar} from the {@link #_balloon}.\n\t *\n\t * @private\n\t */\n\t_hideToolbar() {\n\t\tif ( !this._isVisible ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._balloon.remove( this._toolbar );\n\t}\n\n\t/**\n\t * Returns `true` when the {@link #_toolbar} is the visible view in the {@link #_balloon}.\n\t *\n\t * @private\n\t * @type {Boolean}\n\t */\n\tget _isVisible() {\n\t\treturn this._balloon.visibleView == this._toolbar;\n\t}\n}\n\n/**\n * Items to be placed in the image toolbar.\n * This option is used by the {@link module:image/imagetoolbar~ImageToolbar} feature.\n *\n * Assuming that you use the following features:\n *\n * * {@link module:image/imagestyle~ImageStyle} (with a default configuration),\n * * {@link module:image/imagetextalternative~ImageTextAlternative},\n *\n * three toolbar items will be available in {@link module:ui/componentfactory~ComponentFactory}:\n * `'imageStyle:full'`, `'imageStyle:side'`, and `'imageTextAlternative'` so you can configure the toolbar like this:\n *\n *\t\tconst imageConfig = {\n *\t\t\ttoolbar: [ 'imageStyle:full', 'imageStyle:side', '|', 'imageTextAlternative' ]\n *\t\t};\n *\n * Of course, the same buttons can also be used in the\n * {@link module:core/editor/editorconfig~EditorConfig#toolbar main editor toolbar}.\n *\n * Read more about configuring toolbar in {@link module:core/editor/editorconfig~EditorConfig#toolbar}.\n *\n * @member {Array.<String>} module:image/image~ImageConfig#toolbar\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/findlinkrange\n */\n\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\n\n/**\n * Returns a range containing the entire link in which the given `position` is placed.\n *\n * It can be used e.g. to get the entire range on which the `linkHref` attribute needs to be changed when having a\n * selection inside a link.\n *\n * @param {module:engine/model/position~Position} position The start position.\n * @param {String} value The `linkHref` attribute value.\n * @returns {module:engine/model/range~Range} The link range.\n */\nexport default function findLinkRange( position, value ) {\n\treturn new Range( _findBound( position, value, true ), _findBound( position, value, false ) );\n}\n\n// Walks forward or backward (depends on the `lookBack` flag), node by node, as long as they have the same `linkHref` attribute value\n// and returns a position just before or after (depends on the `lookBack` flag) the last matched node.\n//\n// @param {module:engine/model/position~Position} position The start position.\n// @param {String} value The `linkHref` attribute value.\n// @param {Boolean} lookBack Whether the walk direction is forward (`false`) or backward (`true`).\n// @returns {module:engine/model/position~Position} The position just before the last matched node.\nfunction _findBound( position, value, lookBack ) {\n\t// Get node before or after position (depends on `lookBack` flag).\n\t// When position is inside text node then start searching from text node.\n\tlet node = position.textNode || ( lookBack ? position.nodeBefore : position.nodeAfter );\n\n\tlet lastNode = null;\n\n\twhile ( node && node.getAttribute( 'linkHref' ) == value ) {\n\t\tlastNode = node;\n\t\tnode = lookBack ? node.previousSibling : node.nextSibling;\n\t}\n\n\treturn lastNode ? Position.createAt( lastNode, lookBack ? 'before' : 'after' ) : position;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/linkcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport findLinkRange from './findlinkrange';\nimport toMap from '@ckeditor/ckeditor5-utils/src/tomap';\n\n/**\n * The link command. It is used by the {@link module:link/link~Link link feature}.\n *\n * @extends module:core/command~Command\n */\nexport default class LinkCommand extends Command {\n\t/**\n\t * The value of the `'linkHref'` attribute if the start of the selection is located in a node with this attribute.\n\t *\n\t * @observable\n\t * @readonly\n\t * @member {Object|undefined} #value\n\t */\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tthis.value = doc.selection.getAttribute( 'linkHref' );\n\t\tthis.isEnabled = model.schema.checkAttributeInSelection( doc.selection, 'linkHref' );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * When the selection is non-collapsed, the `linkHref` attribute will be applied to nodes inside the selection, but only to\n\t * those nodes where the `linkHref` attribute is allowed (disallowed nodes will be omitted).\n\t *\n\t * When the selection is collapsed and is not inside the text with the `linkHref` attribute, the\n\t * new {@link module:engine/model/text~Text Text node} with the `linkHref` attribute will be inserted in place of caret, but\n\t * only if such element is allowed in this place. The `_data` of the inserted text will equal the `href` parameter.\n\t * The selection will be updated to wrap the just inserted text node.\n\t *\n\t * When the selection is collapsed and inside the text with the `linkHref` attribute, the attribute value will be updated.\n\t *\n\t * @fires execute\n\t * @param {String} href Link destination.\n\t */\n\texecute( href ) {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\n\t\tmodel.change( writer => {\n\t\t\t// If selection is collapsed then update selected link or insert new one at the place of caret.\n\t\t\tif ( selection.isCollapsed ) {\n\t\t\t\tconst position = selection.getFirstPosition();\n\n\t\t\t\t// When selection is inside text with `linkHref` attribute.\n\t\t\t\tif ( selection.hasAttribute( 'linkHref' ) ) {\n\t\t\t\t\t// Then update `linkHref` value.\n\t\t\t\t\tconst linkRange = findLinkRange( selection.getFirstPosition(), selection.getAttribute( 'linkHref' ) );\n\n\t\t\t\t\twriter.setAttribute( 'linkHref', href, linkRange );\n\n\t\t\t\t\t// Create new range wrapping changed link.\n\t\t\t\t\twriter.setSelection( linkRange );\n\t\t\t\t}\n\t\t\t\t// If not then insert text node with `linkHref` attribute in place of caret.\n\t\t\t\t// However, since selection in collapsed, attribute value will be used as data for text node.\n\t\t\t\t// So, if `href` is empty, do not create text node.\n\t\t\t\telse if ( href !== '' ) {\n\t\t\t\t\tconst attributes = toMap( selection.getAttributes() );\n\n\t\t\t\t\tattributes.set( 'linkHref', href );\n\n\t\t\t\t\tconst node = writer.createText( href, attributes );\n\n\t\t\t\t\twriter.insert( node, position );\n\n\t\t\t\t\t// Create new range wrapping created node.\n\t\t\t\t\twriter.setSelection( Range.createOn( node ) );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// If selection has non-collapsed ranges, we change attribute on nodes inside those ranges\n\t\t\t\t// omitting nodes where `linkHref` attribute is disallowed.\n\t\t\t\tconst ranges = model.schema.getValidRanges( selection.getRanges(), 'linkHref' );\n\n\t\t\t\tfor ( const range of ranges ) {\n\t\t\t\t\twriter.setAttribute( 'linkHref', href, range );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/unlinkcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport findLinkRange from './findlinkrange';\n\n/**\n * The unlink command. It is used by the {@link module:link/link~Link link plugin}.\n *\n * @extends module:core/command~Command\n */\nexport default class UnlinkCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.isEnabled = this.editor.model.document.selection.hasAttribute( 'linkHref' );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * When the selection is collapsed, removes the `linkHref` attribute from each node with the same `linkHref` attribute value.\n\t * When the selection is non-collapsed, removes the `linkHref` attribute from each node in selected ranges.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\n\t\tmodel.change( writer => {\n\t\t\t// Get ranges to unlink.\n\t\t\tconst rangesToUnlink = selection.isCollapsed ?\n\t\t\t\t[ findLinkRange( selection.getFirstPosition(), selection.getAttribute( 'linkHref' ) ) ] : selection.getRanges();\n\n\t\t\t// Remove `linkHref` attribute from specified ranges.\n\t\t\tfor ( const range of rangesToUnlink ) {\n\t\t\t\twriter.removeAttribute( 'linkHref', range );\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/utils\n */\n\nconst linkElementSymbol = Symbol( 'linkElement' );\n\nconst ATTRIBUTE_WHITESPACES = /[\\u0000-\\u0020\\u00A0\\u1680\\u180E\\u2000-\\u2029\\u205f\\u3000]/g; // eslint-disable-line no-control-regex\nconst SAFE_URL = /^(?:(?:https?|ftps?|mailto):|[^a-z]|[a-z+.-]+(?:[^a-z+.:-]|$))/i;\n\n/**\n * Returns `true` if a given view node is the link element.\n *\n * @param {module:engine/view/node~Node} node\n * @returns {Boolean}\n */\nexport function isLinkElement( node ) {\n\treturn node.is( 'attributeElement' ) && !!node.getCustomProperty( linkElementSymbol );\n}\n\n/**\n * Creates link {@link module:engine/view/attributeelement~AttributeElement} with provided `href` attribute.\n *\n * @param {String} href\n * @returns {module:engine/view/attributeelement~AttributeElement}\n */\nexport function createLinkElement( href, writer ) {\n\t// Priority 5 - https://github.com/ckeditor/ckeditor5-link/issues/121.\n\tconst linkElement = writer.createAttributeElement( 'a', { href }, { priority: 5 } );\n\twriter.setCustomProperty( linkElementSymbol, true, linkElement );\n\n\treturn linkElement;\n}\n\n/**\n * Returns a safe URL based on a given value.\n *\n * An URL is considered safe if it is safe for the user (does not contain any malicious code).\n *\n * If URL is considered unsafe, a simple `\"#\"` is returned.\n *\n * @protected\n * @param {*} url\n * @returns {String} Safe URL.\n */\nexport function ensureSafeUrl( url ) {\n\turl = String( url );\n\n\treturn isSafeUrl( url ) ? url : '#';\n}\n\n// Checks whether the given URL is safe for the user (does not contain any malicious code).\n//\n// @param {String} url URL to check.\nfunction isSafeUrl( url ) {\n\tconst normalizedUrl = url.replace( ATTRIBUTE_WHITESPACES, '' );\n\n\treturn normalizedUrl.match( SAFE_URL );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/utils/bindtwostepcarettoattribute\n */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\nimport priorities from '@ckeditor/ckeditor5-utils/src/priorities';\n\n/**\n * This helper enabled the two-step caret (phantom) movement behavior for the given {@link module:engine/model/model~Model}\n * attribute on arrow right (<kbd>→</kbd>) and left (<kbd>←</kbd>) key press.\n *\n * Thanks to this (phantom) caret movement the user is able to type before/after as well as at the\n * beginning/end of an attribute.\n *\n * # Forward movement\n *\n * ## \"Entering\" an attribute:\n *\n * When this behavior is enabled for the `a` attribute and the selection is right before it\n * (at the attribute boundary), pressing the right arrow key will not move the selection but update its\n * attributes accordingly:\n *\n * * When enabled:\n *\n *   \t\tfoo{}<$text a=\"true\">bar</$text>\n *\n *    <kbd>→</kbd>\n *\n *   \t\tfoo<$text a=\"true\">{}bar</$text>\n *\n * * When disabled:\n *\n *   \t\tfoo{}<$text a=\"true\">bar</$text>\n *\n *   <kbd>→</kbd>\n *\n *   \t\tfoo<$text a=\"true\">b{}ar</$text>\n *\n *\n * ## \"Leaving\" an attribute:\n *\n * * When enabled:\n *\n *   \t\t<$text a=\"true\">bar{}</$text>baz\n *\n *    <kbd>→</kbd>\n *\n *   \t\t<$text a=\"true\">bar</$text>{}baz\n *\n * * When disabled:\n *\n *   \t\t<$text a=\"true\">bar{}</$text>baz\n *\n *   <kbd>→</kbd>\n *\n *   \t\t<$text a=\"true\">bar</$text>b{}az\n *\n * # Backward movement\n *\n * * When enabled:\n *\n *   \t\t<$text a=\"true\">bar</$text>{}baz\n *\n *    <kbd>←</kbd>\n *\n *   \t\t<$text a=\"true\">bar{}</$text>baz\n *\n * * When disabled:\n *\n *   \t\t<$text a=\"true\">bar</$text>{}baz\n *\n *   <kbd>←</kbd>\n *\n *   \t\t<$text a=\"true\">ba{}r</$text>b{}az\n *\n * @param {module:engine/view/view~View} view View controller instance.\n * @param {module:engine/model/model~Model} model Data model instance.\n * @param {module:utils/dom/emittermixin~Emitter} emitter The emitter to which this behavior should be added\n * (e.g. a plugin instance).\n * @param {String} attribute Attribute for which this behavior will be added.\n */\nexport default function bindTwoStepCaretToAttribute( view, model, emitter, attribute ) {\n\tconst twoStepCaretHandler = new TwoStepCaretHandler( model, emitter, attribute );\n\tconst modelSelection = model.document.selection;\n\n\t// Listen to keyboard events and handle the caret movement according to the 2-step caret logic.\n\t//\n\t// Note: This listener has the \"high+1\" priority:\n\t// * \"high\" because of the filler logic implemented in the renderer which also engages on #keydown.\n\t// When the gravity is overridden the attributes of the (model) selection attributes are reset.\n\t// It may end up with the filler kicking in and breaking the selection.\n\t// * \"+1\" because we would like to avoid collisions with other features (like Widgets), which\n\t// take over the keydown events with the \"high\" priority. Two-step caret movement takes precedence\n\t// over Widgets in that matter.\n\t//\n\t// Find out more in https://github.com/ckeditor/ckeditor5-engine/issues/1301.\n\temitter.listenTo( view.document, 'keydown', ( evt, data ) => {\n\t\t// This implementation works only for collapsed selection.\n\t\tif ( !modelSelection.isCollapsed ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// When user tries to expand the selection or jump over the whole word or to the beginning/end then\n\t\t// two-steps movement is not necessary.\n\t\tif ( data.shiftKey || data.altKey || data.ctrlKey ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst arrowRightPressed = data.keyCode == keyCodes.arrowright;\n\t\tconst arrowLeftPressed = data.keyCode == keyCodes.arrowleft;\n\n\t\t// When neither left or right arrow has been pressed then do noting.\n\t\tif ( !arrowRightPressed && !arrowLeftPressed ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst position = modelSelection.getFirstPosition();\n\t\tlet isMovementHandled;\n\n\t\tif ( arrowRightPressed ) {\n\t\t\tisMovementHandled = twoStepCaretHandler.handleForwardMovement( position, data );\n\t\t} else {\n\t\t\tisMovementHandled = twoStepCaretHandler.handleBackwardMovement( position, data );\n\t\t}\n\n\t\t// Stop the keydown event if the two-step arent movement handled it. Avoid collisions\n\t\t// with other features which may also take over the caret movement (e.g. Widget).\n\t\tif ( isMovementHandled ) {\n\t\t\tevt.stop();\n\t\t}\n\t}, { priority: priorities.get( 'high' ) + 1 } );\n}\n\n/**\n * This is a private helper–class for {@link module:engine/utils/bindtwostepcarettoattribute}.\n * It handles the state of the 2-step caret movement for a single {@link module:engine/model/model~Model}\n * attribute upon the `keypress` in the {@link module:engine/view/view~View}.\n *\n * @private\n */\nclass TwoStepCaretHandler {\n\t/*\n\t * Creates two step handler instance.\n\t *\n\t * @param {module:engine/model/model~Model} model Data model instance.\n\t * @param {module:utils/dom/emittermixin~Emitter} emitter The emitter to which this behavior should be added\n\t * (e.g. a plugin instance).\n\t * @param {String} attribute Attribute for which the behavior will be added.\n\t */\n\tconstructor( model, emitter, attribute ) {\n\t\t/**\n\t\t * The model instance this class instance operates on.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/model~Model#schema}\n\t\t */\n\t\tthis.model = model;\n\n\t\t/**\n\t\t * The Attribute this class instance operates on.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.attribute = attribute;\n\n\t\t/**\n\t\t * A reference to the document selection.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/model/selection~Selection}\n\t\t */\n\t\tthis._modelSelection = model.document.selection;\n\n\t\t/**\n\t\t * The current UID of the overridden gravity, as returned by\n\t\t * {@link module:engine/model/writer~Writer#overrideSelectionGravity}.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._overrideUid = null;\n\n\t\t/**\n\t\t * A flag indicating that the automatic gravity restoration for this attribute\n\t\t * should not happen upon the next\n\t\t * {@link module:engine/model/selection~Selection#event:change:range} event.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._isNextGravityRestorationSkipped = false;\n\n\t\t// The automatic gravity restoration logic.\n\t\temitter.listenTo( this._modelSelection, 'change:range', ( evt, data ) => {\n\t\t\t// Skipping the automatic restoration is needed if the selection should change\n\t\t\t// but the gravity must remain overridden afterwards. See the #handleBackwardMovement\n\t\t\t// to learn more.\n\t\t\tif ( this._isNextGravityRestorationSkipped ) {\n\t\t\t\tthis._isNextGravityRestorationSkipped = false;\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Skip automatic restore when the gravity is not overridden — simply, there's nothing to restore\n\t\t\t// at this moment.\n\t\t\tif ( !this._isGravityOverridden ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Skip automatic restore when the change is indirect AND the selection is at the attribute boundary.\n\t\t\t// It means that e.g. if the change was external (collaboration) and the user had their\n\t\t\t// selection around the link, its gravity should remain intact in this change:range event.\n\t\t\tif ( !data.directChange && isAtBoundary( this._modelSelection.getFirstPosition(), attribute ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tthis._restoreGravity();\n\t\t} );\n\t}\n\n\t/**\n\t * Updates the document selection and the view according to the two–step caret movement state\n\t * when moving **forwards**. Executed upon `keypress` in the {@link module:engine/view/view~View}.\n\t *\n\t * @param {module:engine/model/position~Position} position The model position at the moment of the key press.\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} data Data of the key press.\n\t * @returns {Boolean} `true` when the handler prevented caret movement\n\t */\n\thandleForwardMovement( position, data ) {\n\t\tconst attribute = this.attribute;\n\n\t\t// DON'T ENGAGE 2-SCM if gravity is already overridden. It means that we just entered\n\t\t//\n\t\t// \t\t<paragraph>foo<$text attribute>{}bar</$text>baz</paragraph>\n\t\t//\n\t\t// or left the attribute\n\t\t//\n\t\t// \t\t<paragraph>foo<$text attribute>bar</$text>{}baz</paragraph>\n\t\t//\n\t\t// and the gravity will be restored automatically.\n\t\tif ( this._isGravityOverridden ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// DON'T ENGAGE 2-SCM when the selection is at the beginning of the block AND already has the\n\t\t// attribute:\n\t\t// * when the selection was initially set there using the mouse,\n\t\t// * when the editor has just started\n\t\t//\n\t\t//\t\t<paragraph><$text attribute>{}bar</$text>baz</paragraph>\n\t\t//\n\t\tif ( position.isAtStart && this._hasSelectionAttribute ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// ENGAGE 2-SCM when about to leave one attribute value and enter another:\n\t\t//\n\t\t// \t\t<paragraph><$text attribute=\"1\">foo{}</$text><$text attribute=\"2\">bar</$text></paragraph>\n\t\t//\n\t\t// but DON'T when already in between of them (no attribute selection):\n\t\t//\n\t\t// \t\t<paragraph><$text attribute=\"1\">foo</$text>{}<$text attribute=\"2\">bar</$text></paragraph>\n\t\t//\n\t\tif ( isBetweenDifferentValues( position, attribute ) && this._hasSelectionAttribute ) {\n\t\t\tthis._preventCaretMovement( data );\n\t\t\tthis._removeSelectionAttribute();\n\n\t\t\treturn true;\n\t\t}\n\n\t\t// ENGAGE 2-SCM when entering an attribute:\n\t\t//\n\t\t// \t\t<paragraph>foo{}<$text attribute>bar</$text>baz</paragraph>\n\t\t//\n\t\tif ( isAtStartBoundary( position, attribute ) ) {\n\t\t\tthis._preventCaretMovement( data );\n\t\t\tthis._overrideGravity();\n\n\t\t\treturn true;\n\t\t}\n\n\t\t// ENGAGE 2-SCM when leaving an attribute:\n\t\t//\n\t\t//\t\t<paragraph>foo<$text attribute>bar{}</$text>baz</paragraph>\n\t\t//\n\t\tif ( isAtEndBoundary( position, attribute ) && this._hasSelectionAttribute ) {\n\t\t\tthis._preventCaretMovement( data );\n\t\t\tthis._overrideGravity();\n\n\t\t\treturn true;\n\t\t}\n\t}\n\n\t/**\n\t * Updates the document selection and the view according to the two–step caret movement state\n\t * when moving **backwards**. Executed upon `keypress` in the {@link module:engine/view/view~View}.\n\t *\n\t * @param {module:engine/model/position~Position} position The model position at the moment of the key press.\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} data Data of the key press.\n\t * @returns {Boolean} `true` when the handler prevented caret movement\n\t */\n\thandleBackwardMovement( position, data ) {\n\t\tconst attribute = this.attribute;\n\n\t\t// When the gravity is already overridden...\n\t\tif ( this._isGravityOverridden ) {\n\t\t\t// ENGAGE 2-SCM & REMOVE SELECTION ATTRIBUTE\n\t\t\t// when about to leave one attribute value and enter another:\n\t\t\t//\n\t\t\t// \t\t<paragraph><$text attribute=\"1\">foo</$text><$text attribute=\"2\">{}bar</$text></paragraph>\n\t\t\t//\n\t\t\t// but DON'T when already in between of them (no attribute selection):\n\t\t\t//\n\t\t\t// \t\t<paragraph><$text attribute=\"1\">foo</$text>{}<$text attribute=\"2\">bar</$text></paragraph>\n\t\t\t//\n\t\t\tif ( isBetweenDifferentValues( position, attribute ) && this._hasSelectionAttribute ) {\n\t\t\t\tthis._preventCaretMovement( data );\n\t\t\t\tthis._restoreGravity();\n\t\t\t\tthis._removeSelectionAttribute();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\t// ENGAGE 2-SCM when at any boundary of the attribute:\n\t\t\t//\n\t\t\t// \t\t<paragraph>foo<$text attribute>bar</$text>{}baz</paragraph>\n\t\t\t// \t\t<paragraph>foo<$text attribute>{}bar</$text>baz</paragraph>\n\t\t\t//\n\t\t\telse {\n\t\t\t\tthis._preventCaretMovement( data );\n\t\t\t\tthis._restoreGravity();\n\n\t\t\t\t// REMOVE SELECTION ATRIBUTE at the beginning of the block.\n\t\t\t\t// It's like restoring gravity but towards a non-existent content when\n\t\t\t\t// the gravity is overridden:\n\t\t\t\t//\n\t\t\t\t// \t\t<paragraph><$text attribute>{}bar</$text></paragraph>\n\t\t\t\t//\n\t\t\t\t// becomes:\n\t\t\t\t//\n\t\t\t\t// \t\t<paragraph>{}<$text attribute>bar</$text></paragraph>\n\t\t\t\t//\n\t\t\t\tif ( position.isAtStart ) {\n\t\t\t\t\tthis._removeSelectionAttribute();\n\t\t\t\t}\n\n\t\t\t\treturn true;\n\t\t\t}\n\t\t} else {\n\t\t\t// ENGAGE 2-SCM when between two different attribute values but selection has no attribute:\n\t\t\t//\n\t\t\t// \t\t<paragraph><$text attribute=\"1\">foo</$text>{}<$text attribute=\"2\">bar</$text></paragraph>\n\t\t\t//\n\t\t\tif ( isBetweenDifferentValues( position, attribute ) && !this._hasSelectionAttribute ) {\n\t\t\t\tthis._preventCaretMovement( data );\n\t\t\t\tthis._setSelectionAttributeFromTheNodeBefore( position );\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\t// End of block boundary cases:\n\t\t\t//\n\t\t\t// \t\t<paragraph><$text attribute>bar{}</$text></paragraph>\n\t\t\t// \t\t<paragraph><$text attribute>bar</$text>{}</paragraph>\n\t\t\t//\n\t\t\tif ( position.isAtEnd && isAtEndBoundary( position, attribute ) ) {\n\t\t\t\t// DON'T ENGAGE 2-SCM if the selection has the attribute already.\n\t\t\t\t// This is a common selection if set using the mouse.\n\t\t\t\t//\n\t\t\t\t// \t\t<paragraph><$text attribute>bar{}</$text></paragraph>\n\t\t\t\t//\n\t\t\t\tif ( this._hasSelectionAttribute ) {\n\t\t\t\t\t// DON'T ENGAGE 2-SCM if the attribute at the end of the block which has length == 1.\n\t\t\t\t\t// Make sure the selection will not the attribute after it moves backwards.\n\t\t\t\t\t//\n\t\t\t\t\t// \t\t<paragraph>foo<$text attribute>b{}</$text></paragraph>\n\t\t\t\t\t//\n\t\t\t\t\tif ( isStepAfterTheAttributeBoundary( position, attribute ) ) {\n\t\t\t\t\t\t// Skip the automatic gravity restore upon the next selection#change:range event.\n\t\t\t\t\t\t// If not skipped, it would automatically restore the gravity, which should remain\n\t\t\t\t\t\t// overridden.\n\t\t\t\t\t\tthis._skipNextAutomaticGravityRestoration();\n\t\t\t\t\t\tthis._overrideGravity();\n\n\t\t\t\t\t\t// Don't return \"true\" here because we didn't call _preventCaretMovement.\n\t\t\t\t\t\t// Returning here will destabilize the filler logic, which also listens to\n\t\t\t\t\t\t// keydown (and the event would be stopped).\n\t\t\t\t\t}\n\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t\t// ENGAGE 2-SCM if the selection has no attribute. This may happen when the user\n\t\t\t\t// left the attribute using a FORWARD 2-SCM.\n\t\t\t\t//\n\t\t\t\t// \t\t<paragraph><$text attribute>bar</$text>{}</paragraph>\n\t\t\t\t//\n\t\t\t\telse {\n\t\t\t\t\tthis._preventCaretMovement( data );\n\t\t\t\t\tthis._setSelectionAttributeFromTheNodeBefore( position );\n\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// REMOVE SELECTION ATRIBUTE when restoring gravity towards a non-existent content at the\n\t\t\t// beginning of the block.\n\t\t\t//\n\t\t\t// \t\t<paragraph>{}<$text attribute>bar</$text></paragraph>\n\t\t\t//\n\t\t\tif ( position.isAtStart ) {\n\t\t\t\tif ( this._hasSelectionAttribute ) {\n\t\t\t\t\tthis._removeSelectionAttribute();\n\t\t\t\t\tthis._preventCaretMovement( data );\n\n\t\t\t\t\treturn true;\n\t\t\t\t}\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// DON'T ENGAGE 2-SCM when about to enter of leave an attribute.\n\t\t\t// We need to check if the caret is a one position before the attribute boundary:\n\t\t\t//\n\t\t\t// \t\t<paragraph>foo<$text attribute>b{}ar</$text>baz</paragraph>\n\t\t\t// \t\t<paragraph>foo<$text attribute>bar</$text>b{}az</paragraph>\n\t\t\t//\n\t\t\tif ( isStepAfterTheAttributeBoundary( position, attribute ) ) {\n\t\t\t\t// Skip the automatic gravity restore upon the next selection#change:range event.\n\t\t\t\t// If not skipped, it would automatically restore the gravity, which should remain\n\t\t\t\t// overridden.\n\t\t\t\tthis._skipNextAutomaticGravityRestoration();\n\t\t\t\tthis._overrideGravity();\n\n\t\t\t\t// Don't return \"true\" here because we didn't call _preventCaretMovement.\n\t\t\t\t// Returning here will destabilize the filler logic, which also listens to\n\t\t\t\t// keydown (and the event would be stopped).\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * `true` when the gravity is overridden for the {@link #attribute}.\n\t *\n\t * @readonly\n\t * @private\n\t * @type {Boolean}\n\t */\n\tget _isGravityOverridden() {\n\t\treturn !!this._overrideUid;\n\t}\n\n\t/**\n\t * `true` when the {@link module:engine/model/selection~Selection} has the {@link #attribute}.\n\t *\n\t * @readonly\n\t * @private\n\t * @type {Boolean}\n\t */\n\tget _hasSelectionAttribute() {\n\t\treturn this._modelSelection.hasAttribute( this.attribute );\n\t}\n\n\t/**\n\t * Overrides the gravity using the {@link module:engine/model/writer~Writer model writer}\n\t * and stores the information about this fact in the {@link #_overrideUid}.\n\t *\n\t * A shorthand for {@link module:engine/model/writer~Writer#overrideSelectionGravity}.\n\t *\n\t * @private\n\t */\n\t_overrideGravity() {\n\t\tthis._overrideUid = this.model.change( writer => writer.overrideSelectionGravity() );\n\t}\n\n\t/**\n\t * Restores the gravity using the {@link module:engine/model/writer~Writer model writer}.\n\t *\n\t * A shorthand for {@link module:engine/model/writer~Writer#restoreSelectionGravity}.\n\t *\n\t * @private\n\t */\n\t_restoreGravity() {\n\t\tthis.model.change( writer => {\n\t\t\twriter.restoreSelectionGravity( this._overrideUid );\n\t\t\tthis._overrideUid = null;\n\t\t} );\n\t}\n\n\t/**\n\t * Prevents the caret movement in the view by calling `preventDefault` on the event data.\n\t *\n\t * @private\n\t */\n\t_preventCaretMovement( data ) {\n\t\tdata.preventDefault();\n\t}\n\n\t/**\n\t * Removes the {@link #attribute} from the selection using using the\n\t * {@link module:engine/model/writer~Writer model writer}.\n\t *\n\t * @private\n\t */\n\t_removeSelectionAttribute() {\n\t\tthis.model.change( writer => {\n\t\t\twriter.removeSelectionAttribute( this.attribute );\n\t\t} );\n\t}\n\n\t/**\n\t * Applies the {@link #attribute} to the current selection using using the\n\t * value from the node before the current position. Uses\n\t * the {@link module:engine/model/writer~Writer model writer}.\n\t *\n\t * @private\n\t * @param {module:engine/model/position~Position} position\n\t */\n\t_setSelectionAttributeFromTheNodeBefore( position ) {\n\t\tconst attribute = this.attribute;\n\n\t\tthis.model.change( writer => {\n\t\t\twriter.setSelectionAttribute( this.attribute, position.nodeBefore.getAttribute( attribute ) );\n\t\t} );\n\t}\n\n\t/**\n\t * Skips the next automatic selection gravity restoration upon the\n\t * {@link module:engine/model/selection~Selection#event:change:range} event.\n\t *\n\t * See {@link #_isNextGravityRestorationSkipped}.\n\t *\n\t * @private\n\t */\n\t_skipNextAutomaticGravityRestoration() {\n\t\tthis._isNextGravityRestorationSkipped = true;\n\t}\n}\n\n// @param {module:engine/model/position~Position} position\n// @param {String} attribute\n// @returns {Boolean} `true` when position between the nodes sticks to the bound of text with given attribute.\nfunction isAtBoundary( position, attribute ) {\n\treturn isAtStartBoundary( position, attribute ) || isAtEndBoundary( position, attribute );\n}\n\n// @param {module:engine/model/position~Position} position\n// @param {String} attribute\nfunction isAtStartBoundary( position, attribute ) {\n\tconst { nodeBefore, nodeAfter } = position;\n\tconst isAttrBefore = nodeBefore ? nodeBefore.hasAttribute( attribute ) : false;\n\tconst isAttrAfter = nodeAfter ? nodeAfter.hasAttribute( attribute ) : false;\n\n\treturn isAttrAfter && ( !isAttrBefore || nodeBefore.getAttribute( attribute ) !== nodeAfter.getAttribute( attribute ) );\n}\n\n// @param {module:engine/model/position~Position} position\n// @param {String} attribute\nfunction isAtEndBoundary( position, attribute ) {\n\tconst { nodeBefore, nodeAfter } = position;\n\tconst isAttrBefore = nodeBefore ? nodeBefore.hasAttribute( attribute ) : false;\n\tconst isAttrAfter = nodeAfter ? nodeAfter.hasAttribute( attribute ) : false;\n\n\treturn isAttrBefore && ( !isAttrAfter || nodeBefore.getAttribute( attribute ) !== nodeAfter.getAttribute( attribute ) );\n}\n\n// @param {module:engine/model/position~Position} position\n// @param {String} attribute\nfunction isBetweenDifferentValues( position, attribute ) {\n\tconst { nodeBefore, nodeAfter } = position;\n\tconst isAttrBefore = nodeBefore ? nodeBefore.hasAttribute( attribute ) : false;\n\tconst isAttrAfter = nodeAfter ? nodeAfter.hasAttribute( attribute ) : false;\n\n\tif ( !isAttrAfter || !isAttrBefore ) {\n\t\treturn;\n\t}\n\n\treturn nodeAfter.getAttribute( attribute ) !== nodeBefore.getAttribute( attribute );\n}\n\n// @param {module:engine/model/position~Position} position\n// @param {String} attribute\nfunction isStepAfterTheAttributeBoundary( position, attribute ) {\n\treturn isAtBoundary( position.getShiftedBy( -1 ), attribute );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/linkediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport {\n\tdowncastAttributeToElement\n} from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport { upcastElementToAttribute } from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport LinkCommand from './linkcommand';\nimport UnlinkCommand from './unlinkcommand';\nimport { createLinkElement, ensureSafeUrl } from './utils';\nimport bindTwoStepCaretToAttribute from '@ckeditor/ckeditor5-engine/src/utils/bindtwostepcarettoattribute';\nimport findLinkRange from './findlinkrange';\nimport '../theme/link.css';\n\nconst HIGHLIGHT_CLASS = 'ck-link_selected';\n\n/**\n * The link engine feature.\n *\n * It introduces the `linkHref=\"url\"` attribute in the model which renders to the view as a `<a href=\"url\">` element.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class LinkEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Allow link attribute on all inline nodes.\n\t\teditor.model.schema.extend( '$text', { allowAttributes: 'linkHref' } );\n\n\t\teditor.conversion.for( 'dataDowncast' )\n\t\t\t.add( downcastAttributeToElement( { model: 'linkHref', view: createLinkElement } ) );\n\n\t\teditor.conversion.for( 'editingDowncast' )\n\t\t\t.add( downcastAttributeToElement( { model: 'linkHref', view: ( href, writer ) => {\n\t\t\t\treturn createLinkElement( ensureSafeUrl( href ), writer );\n\t\t\t} } ) );\n\n\t\teditor.conversion.for( 'upcast' )\n\t\t\t.add( upcastElementToAttribute( {\n\t\t\t\tview: {\n\t\t\t\t\tname: 'a',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\thref: true\n\t\t\t\t\t}\n\t\t\t\t},\n\t\t\t\tmodel: {\n\t\t\t\t\tkey: 'linkHref',\n\t\t\t\t\tvalue: viewElement => viewElement.getAttribute( 'href' )\n\t\t\t\t}\n\t\t\t} ) );\n\n\t\t// Create linking commands.\n\t\teditor.commands.add( 'link', new LinkCommand( editor ) );\n\t\teditor.commands.add( 'unlink', new UnlinkCommand( editor ) );\n\n\t\t// Enable two-step caret movement for `linkHref` attribute.\n\t\tbindTwoStepCaretToAttribute( editor.editing.view, editor.model, this, 'linkHref' );\n\n\t\t// Setup highlight over selected link.\n\t\tthis._setupLinkHighlight();\n\t}\n\n\t/**\n\t * Adds a visual highlight style to a link in which the selection is anchored.\n\t * Together with two-step caret movement, they indicate that the user is typing inside the link.\n\t *\n\t * Highlight is turned on by adding `.ck-link_selected` class to the link in the view:\n\t *\n\t * * the class is removed before conversion has started, as callbacks added with `'highest'` priority\n\t * to {@link module:engine/conversion/downcastdispatcher~DowncastDispatcher} events,\n\t * * the class is added in the view post fixer, after other changes in the model tree were converted to the view.\n\t *\n\t * This way, adding and removing highlight does not interfere with conversion.\n\t *\n\t * @private\n\t */\n\t_setupLinkHighlight() {\n\t\tconst editor = this.editor;\n\t\tconst view = editor.editing.view;\n\t\tconst highlightedLinks = new Set();\n\n\t\t// Adding the class.\n\t\tview.document.registerPostFixer( writer => {\n\t\t\tconst selection = editor.model.document.selection;\n\n\t\t\tif ( selection.hasAttribute( 'linkHref' ) ) {\n\t\t\t\tconst modelRange = findLinkRange( selection.getFirstPosition(), selection.getAttribute( 'linkHref' ) );\n\t\t\t\tconst viewRange = editor.editing.mapper.toViewRange( modelRange );\n\n\t\t\t\t// There might be multiple `a` elements in the `viewRange`, for example, when the `a` element is\n\t\t\t\t// broken by a UIElement.\n\t\t\t\tfor ( const item of viewRange.getItems() ) {\n\t\t\t\t\tif ( item.is( 'a' ) ) {\n\t\t\t\t\t\twriter.addClass( HIGHLIGHT_CLASS, item );\n\t\t\t\t\t\thighlightedLinks.add( item );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\n\t\t// Removing the class.\n\t\teditor.conversion.for( 'editingDowncast' ).add( dispatcher => {\n\t\t\t// Make sure the highlight is removed on every possible event, before conversion is started.\n\t\t\tdispatcher.on( 'insert', removeHighlight, { priority: 'highest' } );\n\t\t\tdispatcher.on( 'remove', removeHighlight, { priority: 'highest' } );\n\t\t\tdispatcher.on( 'attribute', removeHighlight, { priority: 'highest' } );\n\t\t\tdispatcher.on( 'selection', removeHighlight, { priority: 'highest' } );\n\n\t\t\tfunction removeHighlight() {\n\t\t\t\tview.change( writer => {\n\t\t\t\t\tfor ( const item of highlightedLinks.values() ) {\n\t\t\t\t\t\twriter.removeClass( HIGHLIGHT_CLASS, item );\n\t\t\t\t\t\thighlightedLinks.delete( item );\n\t\t\t\t\t}\n\t\t\t\t} );\n\t\t\t}\n\t\t} );\n\t}\n}\n","\n/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/observer/clickobserver\n */\n\nimport DomEventObserver from './domeventobserver';\n\n/**\n * {@link module:engine/view/document~Document#event:click Click} event observer.\n *\n * Note that this observer is not available by default. To make it available it needs to be added to\n * {@link module:engine/view/view~View view controller}\n * by a {@link module:engine/view/view~View#addObserver} method.\n *\n * @extends module:engine/view/observer/domeventobserver~DomEventObserver\n */\nexport default class ClickObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = 'click';\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n\n/**\n * Fired when one of the editables has been clicked.\n *\n * Introduced by {@link module:engine/view/observer/clickobserver~ClickObserver}.\n *\n * Note that this event is not available by default. To make it available\n * {@link module:engine/view/observer/clickobserver~ClickObserver} needs to be added\n * to {@link module:engine/view/view~View} by a {@link module:engine/view/view~View#addObserver} method.\n *\n * @see module:engine/view/observer/clickobserver~ClickObserver\n * @event module:engine/view/document~Document#event:click\n * @param {module:engine/view/observer/domeventdata~DomEventData} data Event data.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module link/ui/linkformview\n */\nimport View from '@ckeditor/ckeditor5-ui/src/view';\nimport ViewCollection from '@ckeditor/ckeditor5-ui/src/viewcollection';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport LabeledInputView from '@ckeditor/ckeditor5-ui/src/labeledinput/labeledinputview';\nimport InputTextView from '@ckeditor/ckeditor5-ui/src/inputtext/inputtextview';\nimport submitHandler from '@ckeditor/ckeditor5-ui/src/bindings/submithandler';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '@ckeditor/ckeditor5-ui/src/focuscycler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport checkIcon from '@ckeditor/ckeditor5-core/theme/icons/check.svg';\nimport cancelIcon from '@ckeditor/ckeditor5-core/theme/icons/cancel.svg';\nimport '../../theme/linkform.css';\n/**\n * The link form view controller class.\n *\n * See {@link module:link/ui/linkformview~LinkFormView}.\n *\n * @extends module:ui/view~View\n */\nexport default class LinkFormView extends View {\n    /**\n\t * @inheritDoc\n\t */\n    constructor(locale) {\n        super(locale);\n        const t = locale.t;\n        /**\n\t\t * Tracks information about DOM focus in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n        this.focusTracker = new FocusTracker();\n        /**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n        this.keystrokes = new KeystrokeHandler();\n        /**\n\t\t * The URL input view.\n\t\t *\n\t\t * @member {module:ui/labeledinput/labeledinputview~LabeledInputView}\n\t\t */\n        this.urlInputView = this._createUrlInput();\n        /**\n\t\t * The Save button view.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n        this.saveButtonView = this._createButton(t('ap'), checkIcon, 'ck-button-save');\n        this.saveButtonView.type = 'submit';\n        /**\n\t\t * The Cancel button view.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n        this.cancelButtonView = this._createButton(t('aq'), cancelIcon, 'ck-button-cancel', 'cancel');\n        /**\n\t\t * A collection of views which can be focused in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n        this._focusables = new ViewCollection();\n        /**\n\t\t * Helps cycling over {@link #_focusables} in the form.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n        this._focusCycler = new FocusCycler({\n            focusables: this._focusables,\n            focusTracker: this.focusTracker,\n            keystrokeHandler: this.keystrokes,\n            actions: {\n                // Navigate form fields backwards using the Shift + Tab keystroke.\n                focusPrevious: 'shift + tab',\n                // Navigate form fields forwards using the Tab key.\n                focusNext: 'tab'\n            }\n        });\n        this.setTemplate({\n            tag: 'form',\n            attributes: {\n                class: [\n                    'ck',\n                    'ck-link-form'\n                ],\n                // https://github.com/ckeditor/ckeditor5-link/issues/90\n                tabindex: '-1'\n            },\n            children: [\n                this.urlInputView,\n                this.saveButtonView,\n                this.cancelButtonView\n            ]\n        });\n    }\n    /**\n\t * @inheritDoc\n\t */\n    render() {\n        super.render();\n        submitHandler({ view: this });\n        const childViews = [\n            this.urlInputView,\n            this.saveButtonView,\n            this.cancelButtonView\n        ];\n        childViews.forEach(v => {\n            // Register the view as focusable.\n            this._focusables.add(v);\n            // Register the view in the focus tracker.\n            this.focusTracker.add(v.element);\n        });\n        // Start listening for the keystrokes coming from #element.\n        this.keystrokes.listenTo(this.element);\n    }\n    /**\n\t * Focuses the fist {@link #_focusables} in the form.\n\t */\n    focus() {\n        this._focusCycler.focusFirst();\n    }\n    /**\n\t * Creates a labeled input view.\n\t *\n\t * @private\n\t * @returns {module:ui/labeledinput/labeledinputview~LabeledInputView} Labeled input view instance.\n\t */\n    _createUrlInput() {\n        const t = this.locale.t;\n        const labeledInput = new LabeledInputView(this.locale, InputTextView);\n        labeledInput.label = t('ar');\n        labeledInput.inputView.placeholder = 'https://example.com';\n        return labeledInput;\n    }\n    /**\n\t * Creates a button view.\n\t *\n\t * @private\n\t * @param {String} label The button label.\n\t * @param {String} icon The button's icon.\n\t * @param {String} className The additional button CSS class name.\n\t * @param {String} [eventName] An event name that the `ButtonView#execute` event will be delegated to.\n\t * @returns {module:ui/button/buttonview~ButtonView} The button view instance.\n\t */\n    _createButton(label, icon, className, eventName) {\n        const button = new ButtonView(this.locale);\n        button.set({\n            label,\n            icon,\n            tooltip: true\n        });\n        button.extendTemplate({ attributes: { class: className } });\n        if (eventName) {\n            button.delegate('execute').to(this, eventName);\n        }\n        return button;\n    }\n}    /**\n * Fired when the form view is submitted (when one of the children triggered the submit event),\n * e.g. click on {@link #saveButtonView}.\n *\n * @event submit\n */\n     /**\n * Fired when the form view is canceled, e.g. click on {@link #cancelButtonView}.\n *\n * @event cancel\n */","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module link/ui/linkactionsview\n */\nimport View from '@ckeditor/ckeditor5-ui/src/view';\nimport ViewCollection from '@ckeditor/ckeditor5-ui/src/viewcollection';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport FocusTracker from '@ckeditor/ckeditor5-utils/src/focustracker';\nimport FocusCycler from '@ckeditor/ckeditor5-ui/src/focuscycler';\nimport KeystrokeHandler from '@ckeditor/ckeditor5-utils/src/keystrokehandler';\nimport { ensureSafeUrl } from '../utils';\nimport unlinkIcon from '../../theme/icons/unlink.svg';\nimport pencilIcon from '@ckeditor/ckeditor5-core/theme/icons/pencil.svg';\nimport '../../theme/linkactions.css';\n/**\n * The link actions view class. This view displays link preview, allows\n * unlinking or editing the link.\n *\n * @extends module:ui/view~View\n */\nexport default class LinkActionsView extends View {\n    /**\n\t * @inheritDoc\n\t */\n    constructor(locale) {\n        super(locale);\n        const t = locale.t;\n        /**\n\t\t * Tracks information about DOM focus in the actions.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/focustracker~FocusTracker}\n\t\t */\n        this.focusTracker = new FocusTracker();\n        /**\n\t\t * An instance of the {@link module:utils/keystrokehandler~KeystrokeHandler}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:utils/keystrokehandler~KeystrokeHandler}\n\t\t */\n        this.keystrokes = new KeystrokeHandler();\n        /**\n\t\t * The href preview view.\n\t\t *\n\t\t * @member {module:ui/view~View}\n\t\t */\n        this.previewButtonView = this._createPreviewButton();\n        /**\n\t\t * The unlink button view.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n        this.unlinkButtonView = this._createButton(t('al'), unlinkIcon, 'unlink');\n        /**\n\t\t * The edit link button view.\n\t\t *\n\t\t * @member {module:ui/button/buttonview~ButtonView}\n\t\t */\n        this.editButtonView = this._createButton(t('am'), pencilIcon, 'edit');\n        /**\n\t\t * Value of the \"href\" attribute of the link to use in the {@link #previewButtonView}.\n\t\t *\n\t\t * @observable\n\t\t * @member {String}\n\t\t */\n        this.set('href');\n        /**\n\t\t * A collection of views which can be focused in the view.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n        this._focusables = new ViewCollection();\n        /**\n\t\t * Helps cycling over {@link #_focusables} in the view.\n\t\t *\n\t\t * @readonly\n\t\t * @protected\n\t\t * @member {module:ui/focuscycler~FocusCycler}\n\t\t */\n        this._focusCycler = new FocusCycler({\n            focusables: this._focusables,\n            focusTracker: this.focusTracker,\n            keystrokeHandler: this.keystrokes,\n            actions: {\n                // Navigate fields backwards using the Shift + Tab keystroke.\n                focusPrevious: 'shift + tab',\n                // Navigate fields forwards using the Tab key.\n                focusNext: 'tab'\n            }\n        });\n        this.setTemplate({\n            tag: 'div',\n            attributes: {\n                class: [\n                    'ck',\n                    'ck-link-actions'\n                ],\n                // https://github.com/ckeditor/ckeditor5-link/issues/90\n                tabindex: '-1'\n            },\n            children: [\n                this.previewButtonView,\n                this.editButtonView,\n                this.unlinkButtonView\n            ]\n        });\n    }\n    /**\n\t * @inheritDoc\n\t */\n    render() {\n        super.render();\n        const childViews = [\n            this.previewButtonView,\n            this.editButtonView,\n            this.unlinkButtonView\n        ];\n        childViews.forEach(v => {\n            // Register the view as focusable.\n            this._focusables.add(v);\n            // Register the view in the focus tracker.\n            this.focusTracker.add(v.element);\n        });\n        // Start listening for the keystrokes coming from #element.\n        this.keystrokes.listenTo(this.element);\n    }\n    /**\n\t * Focuses the fist {@link #_focusables} in the actions.\n\t */\n    focus() {\n        this._focusCycler.focusFirst();\n    }\n    /**\n\t * Creates a button view.\n\t *\n\t * @private\n\t * @param {String} label The button label.\n\t * @param {String} icon The button's icon.\n\t * @param {String} [eventName] An event name that the `ButtonView#execute` event will be delegated to.\n\t * @returns {module:ui/button/buttonview~ButtonView} The button view instance.\n\t */\n    _createButton(label, icon, eventName) {\n        const button = new ButtonView(this.locale);\n        button.set({\n            label,\n            icon,\n            tooltip: true\n        });\n        button.delegate('execute').to(this, eventName);\n        return button;\n    }\n    /**\n\t * Creates a link href preview button.\n\t *\n\t * @private\n\t * @returns {module:ui/button/buttonview~ButtonView} The button view instance.\n\t */\n    _createPreviewButton() {\n        const button = new ButtonView(this.locale);\n        const bind = this.bindTemplate;\n        const t = this.t;\n        button.set({\n            withText: true,\n            tooltip: t('an')\n        });\n        button.extendTemplate({\n            attributes: {\n                class: [\n                    'ck',\n                    'ck-link-actions__preview'\n                ],\n                href: bind.to('href', href => href && ensureSafeUrl(href)),\n                target: '_blank'\n            }\n        });\n        button.bind('label').to(this, 'href', href => {\n            return href || t('ao');\n        });\n        button.bind('isEnabled').to(this, 'href', href => !!href);\n        button.template.tag = 'a';\n        button.template.eventListeners = {};\n        return button;\n    }\n}    /**\n * Fired when the {@link #editButtonView} is clicked.\n *\n * @event edit\n */\n     /**\n * Fired when the {@link #unlinkButtonView} is clicked.\n *\n * @event unlink\n */","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module link/linkui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ClickObserver from '@ckeditor/ckeditor5-engine/src/view/observer/clickobserver';\nimport Range from '@ckeditor/ckeditor5-engine/src/view/range';\nimport { isLinkElement } from './utils';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\nimport clickOutsideHandler from '@ckeditor/ckeditor5-ui/src/bindings/clickoutsidehandler';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\nimport LinkFormView from './ui/linkformview';\nimport LinkActionsView from './ui/linkactionsview';\nimport linkIcon from '../theme/icons/link.svg';\nconst linkKeystroke = 'Ctrl+K';\n/**\n * The link UI plugin. It introduces the Link and Unlink buttons and the <kbd>Ctrl+K</kbd> keystroke.\n *\n * It uses the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon plugin}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class LinkUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    static get requires() {\n        return [ContextualBalloon];\n    }\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        editor.editing.view.addObserver(ClickObserver);\n        /**\n\t\t * The actions view displayed inside of the balloon.\n\t\t *\n\t\t * @member {module:link/ui/linkactionsview~LinkActionsView}\n\t\t */\n        this.actionsView = this._createActionsView();\n        /**\n\t\t * The form view displayed inside the balloon.\n\t\t *\n\t\t * @member {module:link/ui/linkformview~LinkFormView}\n\t\t */\n        this.formView = this._createFormView();\n        /**\n\t\t * The contextual balloon plugin instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:ui/panel/balloon/contextualballoon~ContextualBalloon}\n\t\t */\n        this._balloon = editor.plugins.get(ContextualBalloon);\n        // Create toolbar buttons.\n        this._createToolbarLinkButton();\n        // Attach lifecycle actions to the the balloon.\n        this._enableUserBalloonInteractions();\n    }\n    /**\n\t * Creates the {@link module:link/ui/linkactionsview~LinkActionsView} instance.\n\t *\n\t * @private\n\t * @returns {module:link/ui/linkactionsview~LinkActionsView} The link actions view instance.\n\t */\n    _createActionsView() {\n        const editor = this.editor;\n        const actionsView = new LinkActionsView(editor.locale);\n        const linkCommand = editor.commands.get('link');\n        const unlinkCommand = editor.commands.get('unlink');\n        actionsView.bind('href').to(linkCommand, 'value');\n        actionsView.editButtonView.bind('isEnabled').to(linkCommand);\n        actionsView.unlinkButtonView.bind('isEnabled').to(unlinkCommand);\n        // Execute unlink command after clicking on the \"Edit\" button.\n        this.listenTo(actionsView, 'edit', () => {\n            this._addFormView();\n        });\n        // Execute unlink command after clicking on the \"Unlink\" button.\n        this.listenTo(actionsView, 'unlink', () => {\n            editor.execute('unlink');\n            this._hideUI();\n        });\n        // Close the panel on esc key press when the **actions have focus**.\n        actionsView.keystrokes.set('Esc', (data, cancel) => {\n            this._hideUI();\n            cancel();\n        });\n        // Open the form view on Ctrl+K when the **actions have focus**..\n        actionsView.keystrokes.set(linkKeystroke, (data, cancel) => {\n            this._addFormView();\n            cancel();\n        });\n        return actionsView;\n    }\n    /**\n\t * Creates the {@link module:link/ui/linkformview~LinkFormView} instance.\n\t *\n\t * @private\n\t * @returns {module:link/ui/linkformview~LinkFormView} The link form instance.\n\t */\n    _createFormView() {\n        const editor = this.editor;\n        const formView = new LinkFormView(editor.locale);\n        const linkCommand = editor.commands.get('link');\n        formView.urlInputView.bind('value').to(linkCommand, 'value');\n        // Form elements should be read-only when corresponding commands are disabled.\n        formView.urlInputView.bind('isReadOnly').to(linkCommand, 'isEnabled', value => !value);\n        formView.saveButtonView.bind('isEnabled').to(linkCommand);\n        // Execute link command after clicking the \"Save\" button.\n        this.listenTo(formView, 'submit', () => {\n            editor.execute('link', formView.urlInputView.inputView.element.value);\n            this._removeFormView();\n        });\n        // Hide the panel after clicking the \"Cancel\" button.\n        this.listenTo(formView, 'cancel', () => {\n            this._removeFormView();\n        });\n        // Close the panel on esc key press when the **form has focus**.\n        formView.keystrokes.set('Esc', (data, cancel) => {\n            this._removeFormView();\n            cancel();\n        });\n        return formView;\n    }\n    /**\n\t * Creates a toolbar Link button. Clicking this button will show\n\t * a {@link #_balloon} attached to the selection.\n\t *\n\t * @private\n\t */\n    _createToolbarLinkButton() {\n        const editor = this.editor;\n        const linkCommand = editor.commands.get('link');\n        const t = editor.t;\n        // Handle the `Ctrl+K` keystroke and show the panel.\n        editor.keystrokes.set(linkKeystroke, (keyEvtData, cancel) => {\n            // Prevent focusing the search bar in FF and opening new tab in Edge. #153, #154.\n            cancel();\n            if (linkCommand.isEnabled) {\n                this._showUI();\n            }\n        });\n        editor.ui.componentFactory.add('link', locale => {\n            const button = new ButtonView(locale);\n            button.isEnabled = true;\n            button.label = t('x');\n            button.icon = linkIcon;\n            button.keystroke = linkKeystroke;\n            button.tooltip = true;\n            // Bind button to the command.\n            button.bind('isEnabled').to(linkCommand, 'isEnabled');\n            // Show the panel on button click.\n            this.listenTo(button, 'execute', () => this._showUI());\n            return button;\n        });\n    }\n    /**\n\t * Attaches actions that control whether the balloon panel containing the\n\t * {@link #formView} is visible or not.\n\t *\n\t * @private\n\t */\n    _enableUserBalloonInteractions() {\n        const viewDocument = this.editor.editing.view.document;\n        // Handle click on view document and show panel when selection is placed inside the link element.\n        // Keep panel open until selection will be inside the same link element.\n        this.listenTo(viewDocument, 'click', () => {\n            const parentLink = this._getSelectedLinkElement();\n            if (parentLink) {\n                // Then show panel but keep focus inside editor editable.\n                this._showUI();\n            }\n        });\n        // Focus the form if the balloon is visible and the Tab key has been pressed.\n        this.editor.keystrokes.set('Tab', (data, cancel) => {\n            if (this._areActionsVisible && !this.actionsView.focusTracker.isFocused) {\n                this.actionsView.focus();\n                cancel();\n            }\n        }, {\n            // Use the high priority because the link UI navigation is more important\n            // than other feature's actions, e.g. list indentation.\n            // https://github.com/ckeditor/ckeditor5-link/issues/146\n            priority: 'high'\n        });\n        // Close the panel on the Esc key press when the editable has focus and the balloon is visible.\n        this.editor.keystrokes.set('Esc', (data, cancel) => {\n            if (this._isUIVisible) {\n                this._hideUI();\n                cancel();\n            }\n        });\n        // Close on click outside of balloon panel element.\n        clickOutsideHandler({\n            emitter: this.formView,\n            activator: () => this._isUIVisible,\n            contextElements: [this._balloon.view.element],\n            callback: () => this._hideUI()\n        });\n    }\n    /**\n\t * Adds the {@link #actionsView} to the {@link #_balloon}.\n\t *\n\t * @protected\n\t */\n    _addActionsView() {\n        if (this._areActionsInPanel) {\n            return;\n        }\n        this._balloon.add({\n            view: this.actionsView,\n            position: this._getBalloonPositionData()\n        });\n    }\n    /**\n\t * Adds the {@link #formView} to the {@link #_balloon}.\n\t *\n\t * @protected\n\t */\n    _addFormView() {\n        if (this._isFormInPanel) {\n            return;\n        }\n        const editor = this.editor;\n        const linkCommand = editor.commands.get('link');\n        this._balloon.add({\n            view: this.formView,\n            position: this._getBalloonPositionData()\n        });\n        this.formView.urlInputView.select();\n        // Make sure that each time the panel shows up, the URL field remains in sync with the value of\n        // the command. If the user typed in the input, then canceled the balloon (`urlInputView#value` stays\n        // unaltered) and re-opened it without changing the value of the link command (e.g. because they\n        // clicked the same link), they would see the old value instead of the actual value of the command.\n        // https://github.com/ckeditor/ckeditor5-link/issues/78\n        // https://github.com/ckeditor/ckeditor5-link/issues/123\n        this.formView.urlInputView.inputView.element.value = linkCommand.value || '';\n    }\n    /**\n\t * Removes the {@link #formView} from the {@link #_balloon}.\n\t *\n\t * @protected\n\t */\n    _removeFormView() {\n        if (this._isFormInPanel) {\n            this._balloon.remove(this.formView);\n            // Because the form has an input which has focus, the focus must be brought back\n            // to the editor. Otherwise, it would be lost.\n            this.editor.editing.view.focus();\n        }\n    }\n    /**\n\t * Shows the right kind of the UI for current state of the command. It's either\n\t * {@link #formView} or {@link #actionsView}.\n\t *\n\t * @private\n\t */\n    _showUI() {\n        const editor = this.editor;\n        const linkCommand = editor.commands.get('link');\n        if (!linkCommand.isEnabled) {\n            return;\n        }\n        // When there's no link under the selection, go straight to the editing UI.\n        if (!this._getSelectedLinkElement()) {\n            this._addActionsView();\n            this._addFormView();\n        }    // If theres a link under the selection...\n        else {\n            // Go to the editing UI if actions are already visible.\n            if (this._areActionsVisible) {\n                this._addFormView();\n            }    // Otherwise display just the actions UI.\n            else {\n                this._addActionsView();\n            }\n        }\n        // Begin responding to ui#update once the UI is added.\n        this._startUpdatingUI();\n    }\n    /**\n\t * Removes the {@link #formView} from the {@link #_balloon}.\n\t *\n\t * See {@link #_addFormView}, {@link #_addActionsView}.\n\t *\n\t * @protected\n\t */\n    _hideUI() {\n        if (!this._isUIInPanel) {\n            return;\n        }\n        const editor = this.editor;\n        this.stopListening(editor.ui, 'update');\n        // Remove form first because it's on top of the stack.\n        this._removeFormView();\n        // Then remove the actions view because it's beneath the form.\n        this._balloon.remove(this.actionsView);\n        // Make sure the focus always gets back to the editable.\n        editor.editing.view.focus();\n    }\n    /**\n\t * Makes the UI react to the {@link module:core/editor/editorui~EditorUI#event:update} event to\n\t * reposition itself when the editor ui should be refreshed.\n\t *\n\t * See: {@link #_hideUI} to learn when the UI stops reacting to the `update` event.\n\t *\n\t * @protected\n\t */\n    _startUpdatingUI() {\n        const editor = this.editor;\n        const viewDocument = editor.editing.view.document;\n        let prevSelectedLink = this._getSelectedLinkElement();\n        let prevSelectionParent = getSelectionParent();\n        this.listenTo(editor.ui, 'update', () => {\n            const selectedLink = this._getSelectedLinkElement();\n            const selectionParent = getSelectionParent();\n            // Hide the panel if:\n            //\n            // * the selection went out of the EXISTING link element. E.g. user moved the caret out\n            //   of the link,\n            // * the selection went to a different parent when creating a NEW link. E.g. someone\n            //   else modified the document.\n            // * the selection has expanded (e.g. displaying link actions then pressing SHIFT+Right arrow).\n            //\n            // Note: #_getSelectedLinkElement will return a link for a non-collapsed selection only\n            // when fully selected.\n            if (prevSelectedLink && !selectedLink || !prevSelectedLink && selectionParent !== prevSelectionParent) {\n                this._hideUI();\n            }    // Update the position of the panel when:\n                 //  * the selection remains in the original link element,\n                 //  * there was no link element in the first place, i.e. creating a new link\n            else {\n                // If still in a link element, simply update the position of the balloon.\n                // If there was no link (e.g. inserting one), the balloon must be moved\n                // to the new position in the editing view (a new native DOM range).\n                this._balloon.updatePosition(this._getBalloonPositionData());\n            }\n            prevSelectedLink = selectedLink;\n            prevSelectionParent = selectionParent;\n        });\n        function getSelectionParent() {\n            return viewDocument.selection.focus.getAncestors().reverse().find(node => node.is('element'));\n        }\n    }\n    /**\n\t * Returns true when {@link #formView} is in the {@link #_balloon}.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {Boolean}\n\t */\n    get _isFormInPanel() {\n        return this._balloon.hasView(this.formView);\n    }\n    /**\n\t * Returns true when {@link #actionsView} is in the {@link #_balloon}.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {Boolean}\n\t */\n    get _areActionsInPanel() {\n        return this._balloon.hasView(this.actionsView);\n    }\n    /**\n\t * Returns true when {@link #actionsView} is in the {@link #_balloon} and it is\n\t * currently visible.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {Boolean}\n\t */\n    get _areActionsVisible() {\n        return this._balloon.visibleView === this.actionsView;\n    }\n    /**\n\t * Returns true when {@link #actionsView} or {@link #formView} is in the {@link #_balloon}.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {Boolean}\n\t */\n    get _isUIInPanel() {\n        return this._isFormInPanel || this._areActionsInPanel;\n    }\n    /**\n\t * Returns true when {@link #actionsView} or {@link #formView} is in the {@link #_balloon} and it is\n\t * currently visible.\n\t *\n\t * @readonly\n\t * @protected\n\t * @type {Boolean}\n\t */\n    get _isUIVisible() {\n        const visibleView = this._balloon.visibleView;\n        return visibleView == this.formView || this._areActionsVisible;\n    }\n    /**\n\t * Returns positioning options for the {@link #_balloon}. They control the way the balloon is attached\n\t * to the target element or selection.\n\t *\n\t * If the selection is collapsed and inside a link element, the panel will be attached to the\n\t * entire link element. Otherwise, it will be attached to the selection.\n\t *\n\t * @private\n\t * @returns {module:utils/dom/position~Options}\n\t */\n    _getBalloonPositionData() {\n        const view = this.editor.editing.view;\n        const viewDocument = view.document;\n        const targetLink = this._getSelectedLinkElement();\n        const target = targetLink ? // When selection is inside link element, then attach panel to this element.\n        view.domConverter.mapViewToDom(targetLink) : // Otherwise attach panel to the selection.\n        view.domConverter.viewRangeToDom(viewDocument.selection.getFirstRange());\n        return { target };\n    }\n    /**\n\t * Returns the link {@link module:engine/view/attributeelement~AttributeElement} under\n\t * the {@link module:engine/view/document~Document editing view's} selection or `null`\n\t * if there is none.\n\t *\n\t * **Note**: For a non–collapsed selection the link element is only returned when **fully**\n\t * selected and the **only** element within the selection boundaries.\n\t *\n\t * @private\n\t * @returns {module:engine/view/attributeelement~AttributeElement|null}\n\t */\n    _getSelectedLinkElement() {\n        const selection = this.editor.editing.view.document.selection;\n        if (selection.isCollapsed) {\n            return findLinkElementAncestor(selection.getFirstPosition());\n        } else {\n            // The range for fully selected link is usually anchored in adjacent text nodes.\n            // Trim it to get closer to the actual link element.\n            const range = selection.getFirstRange().getTrimmed();\n            const startLink = findLinkElementAncestor(range.start);\n            const endLink = findLinkElementAncestor(range.end);\n            if (!startLink || startLink != endLink) {\n                return null;\n            }\n            // Check if the link element is fully selected.\n            if (Range.createIn(startLink).getTrimmed().isEqual(range)) {\n                return startLink;\n            } else {\n                return null;\n            }\n        }\n    }\n}\n// Returns a link element if there's one among the ancestors of the provided `Position`.\n//\n// @private\n// @param {module:engine/view/position~Position} View position to analyze.\n// @returns {module:engine/view/attributeelement~AttributeElement|null} Link element at the position or null.\nfunction findLinkElementAncestor(position) {\n    return position.getAncestors().find(ancestor => isLinkElement(ancestor));\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/listcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The list command. It is used by the {@link module:list/list~List list feature}.\n *\n * @extends module:core/command~Command\n */\nexport default class ListCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {'numbered'|'bulleted'} type List type that will be handled by this command.\n\t */\n\tconstructor( editor, type ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The type of the list created by the command.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'numbered'|'bulleted'}\n\t\t */\n\t\tthis.type = type == 'bulleted' ? 'bulleted' : 'numbered';\n\n\t\t/**\n\t\t * A flag indicating whether the command is active, which means that the selection starts in a list of the same type.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #value\n\t\t */\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.value = this._getValue();\n\t\tthis.isEnabled = this._checkEnabled();\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * @protected\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\t\tconst blocks = Array.from( document.selection.getSelectedBlocks() )\n\t\t\t.filter( block => checkCanBecomeListItem( block, model.schema ) );\n\n\t\t// Whether we are turning off some items.\n\t\tconst turnOff = this.value === true;\n\t\t// If we are turning off items, we are going to rename them to paragraphs.\n\n\t\tmodel.change( writer => {\n\t\t\t// If part of a list got turned off, we need to handle (outdent) all of sub-items of the last turned-off item.\n\t\t\t// To be sure that model is all the time in a good state, we first fix items below turned-off item.\n\t\t\tif ( turnOff ) {\n\t\t\t\t// Start from the model item that is just after the last turned-off item.\n\t\t\t\tlet next = blocks[ blocks.length - 1 ].nextSibling;\n\t\t\t\tlet currentIndent = Number.POSITIVE_INFINITY;\n\t\t\t\tlet changes = [];\n\n\t\t\t\t// Correct indent of all items after the last turned off item.\n\t\t\t\t// Rules that should be followed:\n\t\t\t\t// 1. All direct sub-items of turned-off item should become indent 0, because the first item after it\n\t\t\t\t//    will be the first item of a new list. Other items are at the same level, so should have same 0 index.\n\t\t\t\t// 2. All items with indent lower than indent of turned-off item should become indent 0, because they\n\t\t\t\t//    should not end up as a child of any of list items that they were not children of before.\n\t\t\t\t// 3. All other items should have their indent changed relatively to it's parent.\n\t\t\t\t//\n\t\t\t\t// For example:\n\t\t\t\t// 1  * --------\n\t\t\t\t// 2     * --------\n\t\t\t\t// 3        * --------\t\t\t<-- this is turned off.\n\t\t\t\t// 4           * --------\t\t<-- this has to become indent = 0, because it will be first item on a new list.\n\t\t\t\t// 5              * --------\t<-- this should be still be a child of item above, so indent = 1.\n\t\t\t\t// 6        * --------\t\t\t<-- this has to become indent = 0, because it should not be a child of any of items above.\n\t\t\t\t// 7           * --------\t\t<-- this should be still be a child of item above, so indent = 1.\n\t\t\t\t// 8     * --------\t\t\t\t<-- this has to become indent = 0.\n\t\t\t\t// 9        * --------\t\t\t<-- this should still be a child of item above, so indent = 1.\n\t\t\t\t// 10          * --------\t\t<-- this should still be a child of item above, so indent = 2.\n\t\t\t\t// 11          * --------\t\t<-- this should still be at the same level as item above, so indent = 2.\n\t\t\t\t// 12 * --------\t\t\t\t<-- this and all below are left unchanged.\n\t\t\t\t// 13    * --------\n\t\t\t\t// 14       * --------\n\t\t\t\t//\n\t\t\t\t// After turning off 3 the list becomes:\n\t\t\t\t//\n\t\t\t\t// 1  * --------\n\t\t\t\t// 2     * --------\n\t\t\t\t//\n\t\t\t\t// 3  --------\n\t\t\t\t//\n\t\t\t\t// 4  * --------\n\t\t\t\t// 5     * --------\n\t\t\t\t// 6  * --------\n\t\t\t\t// 7     * --------\n\t\t\t\t// 8  * --------\n\t\t\t\t// 9     * --------\n\t\t\t\t// 10       * --------\n\t\t\t\t// 11       * --------\n\t\t\t\t// 12 * --------\n\t\t\t\t// 13    * --------\n\t\t\t\t// 14       * --------\n\t\t\t\t//\n\t\t\t\t// Thanks to this algorithm no lists are mismatched and no items get unexpected children/parent, while\n\t\t\t\t// those parent-child connection which are possible to maintain are still maintained. It's worth noting\n\t\t\t\t// that this is the same effect that we would be get by multiple use of outdent command. However doing\n\t\t\t\t// it like this is much more efficient because it's less operation (less memory usage, easier OT) and\n\t\t\t\t// less conversion (faster).\n\t\t\t\twhile ( next && next.name == 'listItem' && next.getAttribute( 'listIndent' ) !== 0 ) {\n\t\t\t\t\t// Check each next list item, as long as its indent is bigger than 0.\n\t\t\t\t\t// If the indent is 0 we are not going to change anything anyway.\n\t\t\t\t\tconst indent = next.getAttribute( 'listIndent' );\n\n\t\t\t\t\t// We check if that's item indent is lower as current relative indent.\n\t\t\t\t\tif ( indent < currentIndent ) {\n\t\t\t\t\t\t// If it is, current relative indent becomes that indent.\n\t\t\t\t\t\tcurrentIndent = indent;\n\t\t\t\t\t}\n\n\t\t\t\t\t// Fix indent relatively to current relative indent.\n\t\t\t\t\t// Note, that if we just changed the current relative indent, the newIndent will be equal to 0.\n\t\t\t\t\tconst newIndent = indent - currentIndent;\n\n\t\t\t\t\t// Save the entry in changes array. We do not apply it at the moment, because we will need to\n\t\t\t\t\t// reverse the changes so the last item is changed first.\n\t\t\t\t\t// This is to keep model in correct state all the time.\n\t\t\t\t\tchanges.push( { element: next, listIndent: newIndent } );\n\n\t\t\t\t\t// Find next item.\n\t\t\t\t\tnext = next.nextSibling;\n\t\t\t\t}\n\n\t\t\t\tchanges = changes.reverse();\n\n\t\t\t\tfor ( const item of changes ) {\n\t\t\t\t\twriter.setAttribute( 'listIndent', item.listIndent, item.element );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// If we are turning on, we might change some items that are already `listItem`s but with different type.\n\t\t\t// Changing one nested list item to other type should also trigger changing all its siblings so the\n\t\t\t// whole nested list is of the same type.\n\t\t\t// Example (assume changing to numbered list):\n\t\t\t// * ------\t\t\t\t<-- do not fix, top level item\n\t\t\t//   * ------\t\t\t<-- fix, because latter list item of this item's list is changed\n\t\t\t//      * ------\t\t<-- do not fix, item is not affected (different list)\n\t\t\t//   * ------\t\t\t<-- fix, because latter list item of this item's list is changed\n\t\t\t//      * ------\t\t<-- fix, because latter list item of this item's list is changed\n\t\t\t//      * ---[--\t\t<-- already in selection\n\t\t\t//   * ------\t\t\t<-- already in selection\n\t\t\t//   * ------\t\t\t<-- already in selection\n\t\t\t// * ------\t\t\t\t<-- already in selection, but does not cause other list items to change because is top-level\n\t\t\t//   * ---]--\t\t\t<-- already in selection\n\t\t\t//   * ------\t\t\t<-- fix, because preceding list item of this item's list is changed\n\t\t\t//      * ------\t\t<-- do not fix, item is not affected (different list)\n\t\t\t// * ------\t\t\t\t<-- do not fix, top level item\n\t\t\tif ( !turnOff ) {\n\t\t\t\t// Find lowest indent among selected items. This will be indicator what is the indent of\n\t\t\t\t// top-most list affected by the command.\n\t\t\t\tlet lowestIndent = Number.POSITIVE_INFINITY;\n\n\t\t\t\tfor ( const item of blocks ) {\n\t\t\t\t\tif ( item.is( 'listItem' ) && item.getAttribute( 'listIndent' ) < lowestIndent ) {\n\t\t\t\t\t\tlowestIndent = item.getAttribute( 'listIndent' );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Do not execute the fix for top-level lists.\n\t\t\t\tlowestIndent = lowestIndent === 0 ? 1 : lowestIndent;\n\n\t\t\t\t// Fix types of list items that are \"before\" the selected blocks.\n\t\t\t\t_fixType( blocks, true, lowestIndent );\n\n\t\t\t\t// Fix types of list items that are \"after\" the selected blocks.\n\t\t\t\t_fixType( blocks, false, lowestIndent );\n\t\t\t}\n\n\t\t\t// Phew! Now it will be easier :).\n\t\t\t// For each block element that was in the selection, we will either: turn it to list item,\n\t\t\t// turn it to paragraph, or change it's type. Or leave it as it is.\n\t\t\t// Do it in reverse as there might be multiple blocks (same as with changing indents).\n\t\t\tfor ( const element of blocks.reverse() ) {\n\t\t\t\tif ( turnOff && element.name == 'listItem' ) {\n\t\t\t\t\t// We are turning off and the element is a `listItem` - it should be converted to `paragraph`.\n\t\t\t\t\t// List item specific attributes are removed by post fixer.\n\t\t\t\t\twriter.rename( element, 'paragraph' );\n\t\t\t\t} else if ( !turnOff && element.name != 'listItem' ) {\n\t\t\t\t\t// We are turning on and the element is not a `listItem` - it should be converted to `listItem`.\n\t\t\t\t\t// The order of operations is important to keep model in correct state.\n\t\t\t\t\twriter.setAttributes( { listType: this.type, listIndent: 0 }, element );\n\t\t\t\t\twriter.rename( element, 'listItem' );\n\t\t\t\t} else if ( !turnOff && element.name == 'listItem' && element.getAttribute( 'listType' ) != this.type ) {\n\t\t\t\t\t// We are turning on and the element is a `listItem` but has different type - change it's type and\n\t\t\t\t\t// type of it's all siblings that have same indent.\n\t\t\t\t\twriter.setAttribute( 'listType', this.type, element );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Checks the command's {@link #value}.\n\t *\n\t * @private\n\t * @returns {Boolean} The current value.\n\t */\n\t_getValue() {\n\t\t// Check whether closest `listItem` ancestor of the position has a correct type.\n\t\tconst listItem = first( this.editor.model.document.selection.getSelectedBlocks() );\n\n\t\treturn !!listItem && listItem.is( 'listItem' ) && listItem.getAttribute( 'listType' ) == this.type;\n\t}\n\n\t/**\n\t * Checks whether the command can be enabled in the current context.\n\t *\n\t * @private\n\t * @returns {Boolean} Whether the command should be enabled.\n\t */\n\t_checkEnabled() {\n\t\t// If command value is true it means that we are in list item, so the command should be enabled.\n\t\tif ( this.value ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tconst selection = this.editor.model.document.selection;\n\t\tconst schema = this.editor.model.schema;\n\n\t\tconst firstBlock = first( selection.getSelectedBlocks() );\n\n\t\tif ( !firstBlock ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Otherwise, check if list item can be inserted at the position start.\n\t\treturn checkCanBecomeListItem( firstBlock, schema );\n\t}\n}\n\n// Helper function used when one or more list item have their type changed. Fixes type of other list items\n// that are affected by the change (are in same lists) but are not directly in selection. The function got extracted\n// not to duplicated code, as same fix has to be performed before and after selection.\n//\n// @param {Array.<module:engine/model/node~Node>} blocks Blocks that are in selection.\n// @param {Boolean} isBackward Specified whether fix will be applied for blocks before first selected block (`true`)\n// or blocks after last selected block (`false`).\n// @param {Number} lowestIndent Lowest indent among selected blocks.\nfunction _fixType( blocks, isBackward, lowestIndent ) {\n\t// We need to check previous sibling of first changed item and next siblings of last changed item.\n\tconst startingItem = isBackward ? blocks[ 0 ] : blocks[ blocks.length - 1 ];\n\n\tif ( startingItem.is( 'listItem' ) ) {\n\t\tlet item = startingItem[ isBackward ? 'previousSibling' : 'nextSibling' ];\n\t\t// During processing items, keeps the lowest indent of already processed items.\n\t\t// This saves us from changing too many items.\n\t\t// Following example is for going forward as it is easier to read, however same applies to going backward.\n\t\t// * ------\n\t\t//   * ------\n\t\t//     * --[---\n\t\t//   * ------\t\t<-- `lowestIndent` should be 1\n\t\t//     * --]---\t\t<-- `startingItem`, `currentIndent` = 2, `lowestIndent` == 1\n\t\t//     * ------\t\t<-- should be fixed, `indent` == 2 == `currentIndent`\n\t\t//   * ------\t\t<-- should be fixed, set `currentIndent` to 1, `indent` == 1 == `currentIndent`\n\t\t//     * ------\t\t<-- should not be fixed, item is in different list, `indent` = 2, `indent` != `currentIndent`\n\t\t//   * ------\t\t<-- should be fixed, `indent` == 1 == `currentIndent`\n\t\t// * ------\t\t\t<-- break loop (`indent` < `lowestIndent`)\n\t\tlet currentIndent = startingItem.getAttribute( 'listIndent' );\n\n\t\t// Look back until a list item with indent lower than reference `lowestIndent`.\n\t\t// That would be the parent of nested sublist which contains item having `lowestIndent`.\n\t\twhile ( item && item.is( 'listItem' ) && item.getAttribute( 'listIndent' ) >= lowestIndent ) {\n\t\t\tif ( currentIndent > item.getAttribute( 'listIndent' ) ) {\n\t\t\t\tcurrentIndent = item.getAttribute( 'listIndent' );\n\t\t\t}\n\n\t\t\t// Found an item that is in the same nested sublist.\n\t\t\tif ( item.getAttribute( 'listIndent' ) == currentIndent ) {\n\t\t\t\t// Just add the item to selected blocks like it was selected by the user.\n\t\t\t\tblocks[ isBackward ? 'unshift' : 'push' ]( item );\n\t\t\t}\n\n\t\t\titem = item[ isBackward ? 'previousSibling' : 'nextSibling' ];\n\t\t}\n\t}\n}\n\n// Checks whether the given block can be replaced by a listItem.\n//\n// @private\n// @param {module:engine/model/element~Element} block A block to be tested.\n// @param {module:engine/model/schema~Schema} schema The schema of the document.\n// @returns {Boolean}\nfunction checkCanBecomeListItem( block, schema ) {\n\treturn schema.checkChild( block.parent, 'listItem' ) && !schema.isObject( block );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/indentcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport first from '@ckeditor/ckeditor5-utils/src/first';\n\n/**\n * The list indent command. It is used by the {@link module:list/list~List list feature}.\n *\n * @extends module:core/command~Command\n */\nexport default class IndentCommand extends Command {\n\t/**\n\t * Creates an instance of the command.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor instance.\n\t * @param {'forward'|'backward'} indentDirection The direction of indent. If it is equal to `backward`, the command\n\t * will outdent a list item.\n\t */\n\tconstructor( editor, indentDirection ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * Determines by how much the command will change the list item's indent attribute.\n\t\t *\n\t\t * @readonly\n\t\t * @private\n\t\t * @member {Number}\n\t\t */\n\t\tthis._indentBy = indentDirection == 'forward' ? 1 : -1;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tthis.isEnabled = this._checkEnabled();\n\t}\n\n\t/**\n\t * Indents or outdents (depends on the {@link #constructor}'s `indentDirection` parameter) selected list items.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tlet itemsToChange = Array.from( doc.selection.getSelectedBlocks() );\n\n\t\tmodel.change( writer => {\n\t\t\tconst lastItem = itemsToChange[ itemsToChange.length - 1 ];\n\n\t\t\t// Indenting a list item should also indent all the items that are already sub-items of indented item.\n\t\t\tlet next = lastItem.nextSibling;\n\n\t\t\t// Check all items after last indented item, as long as their indent is bigger than indent of that item.\n\t\t\twhile ( next && next.name == 'listItem' && next.getAttribute( 'listIndent' ) > lastItem.getAttribute( 'listIndent' ) ) {\n\t\t\t\titemsToChange.push( next );\n\n\t\t\t\tnext = next.nextSibling;\n\t\t\t}\n\n\t\t\t// We need to be sure to keep model in correct state after each small change, because converters\n\t\t\t// bases on that state and assumes that model is correct.\n\t\t\t// Because of that, if the command outdents items, we will outdent them starting from the last item, as\n\t\t\t// it is safer.\n\t\t\tif ( this._indentBy < 0 ) {\n\t\t\t\titemsToChange = itemsToChange.reverse();\n\t\t\t}\n\n\t\t\tfor ( const item of itemsToChange ) {\n\t\t\t\tconst indent = item.getAttribute( 'listIndent' ) + this._indentBy;\n\n\t\t\t\t// If indent is lower than 0, it means that the item got outdented when it was not indented.\n\t\t\t\t// This means that we need to convert that list item to paragraph.\n\t\t\t\tif ( indent < 0 ) {\n\t\t\t\t\t// To keep the model as correct as possible, first rename listItem, then remove attributes,\n\t\t\t\t\t// as listItem without attributes is very incorrect and will cause problems in converters.\n\t\t\t\t\t// No need to remove attributes, will be removed by post fixer.\n\t\t\t\t\twriter.rename( item, 'paragraph' );\n\t\t\t\t}\n\t\t\t\t// If indent is >= 0, change the attribute value.\n\t\t\t\telse {\n\t\t\t\t\twriter.setAttribute( 'listIndent', indent, item );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Checks whether the command can be enabled in the current context.\n\t *\n\t * @private\n\t * @returns {Boolean} Whether the command should be enabled.\n\t */\n\t_checkEnabled() {\n\t\t// Check whether any of position's ancestor is a list item.\n\t\tconst listItem = first( this.editor.model.document.selection.getSelectedBlocks() );\n\n\t\t// If selection is not in a list item, the command is disabled.\n\t\tif ( !listItem || !listItem.is( 'listItem' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this._indentBy > 0 ) {\n\t\t\t// Cannot indent first item in it's list. Check if before `listItem` is a list item that is in same list.\n\t\t\t// To be in the same list, the item has to have same attributes and cannot be \"split\" by an item with lower indent.\n\t\t\tconst indent = listItem.getAttribute( 'listIndent' );\n\t\t\tconst type = listItem.getAttribute( 'listType' );\n\n\t\t\tlet prev = listItem.previousSibling;\n\n\t\t\twhile ( prev && prev.is( 'listItem' ) && prev.getAttribute( 'listIndent' ) >= indent ) {\n\t\t\t\tif ( prev.getAttribute( 'listIndent' ) == indent ) {\n\t\t\t\t\t// The item is on the same level.\n\t\t\t\t\t// If it has same type, it means that we found a preceding sibling from the same list.\n\t\t\t\t\t// If it does not have same type, it means that `listItem` is on different list (this can happen only\n\t\t\t\t\t// on top level lists, though).\n\t\t\t\t\treturn prev.getAttribute( 'listType' ) == type;\n\t\t\t\t}\n\n\t\t\t\tprev = prev.previousSibling;\n\t\t\t}\n\n\t\t\t// Could not find similar list item, this means that `listItem` is first in its list.\n\t\t\treturn false;\n\t\t}\n\n\t\t// If we are outdenting it is enough to be in list item. Every list item can always be outdented.\n\t\treturn true;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/utils\n */\n\n/**\n * Creates list item {@link module:engine/view/containerelement~ContainerElement}.\n *\n * @param {module:engine/view/writer~Writer} writer The writer instance.\n * @returns {module:engine/view/containerelement~ContainerElement}\n */\nexport function createViewListItemElement( writer ) {\n\tconst viewItem = writer.createContainerElement( 'li' );\n\tviewItem.getFillerOffset = getFillerOffset;\n\n\treturn viewItem;\n}\n\n// Implementation of getFillerOffset for view list item element.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\tconst hasOnlyLists = !this.isEmpty && ( this.getChild( 0 ).name == 'ul' || this.getChild( 0 ).name == 'ol' );\n\n\treturn this.isEmpty || hasOnlyLists ? 0 : null;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/converters\n */\n\nimport ModelElement from '@ckeditor/ckeditor5-engine/src/model/element';\nimport ModelPosition from '@ckeditor/ckeditor5-engine/src/model/position';\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\n\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport ViewRange from '@ckeditor/ckeditor5-engine/src/view/range';\nimport ViewTreeWalker from '@ckeditor/ckeditor5-engine/src/view/treewalker';\nimport { createViewListItemElement } from './utils';\n\n/**\n * A model-to-view converter for `listItem` model element insertion.\n *\n * It creates a `<ul><li></li><ul>` (or `<ol>`) view structure out of a `listItem` model element, inserts it at the correct\n * position, and merges the list with surrounding lists (if available).\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewInsertion( evt, data, conversionApi ) {\n\tconst consumable = conversionApi.consumable;\n\n\tif ( !consumable.test( data.item, 'insert' ) ||\n\t\t!consumable.test( data.item, 'attribute:listType' ) ||\n\t\t!consumable.test( data.item, 'attribute:listIndent' )\n\t) {\n\t\treturn;\n\t}\n\n\tconsumable.consume( data.item, 'insert' );\n\tconsumable.consume( data.item, 'attribute:listType' );\n\tconsumable.consume( data.item, 'attribute:listIndent' );\n\n\tconst modelItem = data.item;\n\tconst viewItem = generateLiInUl( modelItem, conversionApi );\n\n\tinjectViewList( modelItem, viewItem, conversionApi );\n}\n\n/**\n * A model-to-view converter for `listItem` model element removal.\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:remove\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewRemove( evt, data, conversionApi ) {\n\tconst viewStart = conversionApi.mapper.toViewPosition( data.position ).getLastMatchingPosition( value => !value.item.is( 'li' ) );\n\tconst viewItem = viewStart.nodeAfter;\n\tconst viewWriter = conversionApi.writer;\n\n\t// 1. Break the container after and before the list item.\n\t// This will create a view list with one view list item - the one to remove.\n\tviewWriter.breakContainer( ViewPosition.createBefore( viewItem ) );\n\tviewWriter.breakContainer( ViewPosition.createAfter( viewItem ) );\n\n\t// 2. Remove the list with the item to remove.\n\tconst viewList = viewItem.parent;\n\tconst viewListPrev = viewList.previousSibling;\n\tconst removeRange = ViewRange.createOn( viewList );\n\tconst removed = viewWriter.remove( removeRange );\n\n\t// 3. Merge the whole created by breaking and removing the list.\n\tif ( viewListPrev && viewListPrev.nextSibling ) {\n\t\tmergeViewLists( viewWriter, viewListPrev, viewListPrev.nextSibling );\n\t}\n\n\t// 4. Bring back nested list that was in the removed <li>.\n\tconst modelItem = conversionApi.mapper.toModelElement( viewItem );\n\n\thoistNestedLists( modelItem.getAttribute( 'listIndent' ) + 1, data.position, removeRange.start, viewItem, conversionApi );\n\n\t// 5. Unbind removed view item and all children.\n\tfor ( const child of ViewRange.createIn( removed ).getItems() ) {\n\t\tconversionApi.mapper.unbindViewElement( child );\n\t}\n\n\tevt.stop();\n}\n\n/**\n * A model-to-view converter for `type` attribute change on `listItem` model element.\n *\n * This change means that `<li>` elements parent changes from `<ul>` to `<ol>` (or vice versa). This is accomplished\n * by breaking view elements, changing their name and merging them.\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewChangeType( evt, data, conversionApi ) {\n\tif ( !conversionApi.consumable.consume( data.item, 'attribute:listType' ) ) {\n\t\treturn;\n\t}\n\n\tconst viewItem = conversionApi.mapper.toViewElement( data.item );\n\tconst viewWriter = conversionApi.writer;\n\n\t// 1. Break the container after and before the list item.\n\t// This will create a view list with one view list item -- the one that changed type.\n\tviewWriter.breakContainer( ViewPosition.createBefore( viewItem ) );\n\tviewWriter.breakContainer( ViewPosition.createAfter( viewItem ) );\n\n\t// 2. Change name of the view list that holds the changed view item.\n\t// We cannot just change name property, because that would not render properly.\n\tlet viewList = viewItem.parent;\n\tconst listName = data.attributeNewValue == 'numbered' ? 'ol' : 'ul';\n\tviewList = viewWriter.rename( viewList, listName );\n\n\t// 3. Merge the changed view list with other lists, if possible.\n\tmergeViewLists( viewWriter, viewList, viewList.nextSibling );\n\tmergeViewLists( viewWriter, viewList.previousSibling, viewList );\n\n\t// 4. Consumable insertion of children inside the item. They are already handled by re-building the item in view.\n\tfor ( const child of data.item.getChildren() ) {\n\t\tconversionApi.consumable.consume( child, 'insert' );\n\t}\n}\n\n/**\n * A model-to-view converter for `listIndent` attribute change on `listItem` model element.\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:attribute\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewChangeIndent( evt, data, conversionApi ) {\n\tif ( !conversionApi.consumable.consume( data.item, 'attribute:listIndent' ) ) {\n\t\treturn;\n\t}\n\n\tconst viewItem = conversionApi.mapper.toViewElement( data.item );\n\tconst viewWriter = conversionApi.writer;\n\n\t// 1. Break the container after and before the list item.\n\t// This will create a view list with one view list item -- the one that changed type.\n\tviewWriter.breakContainer( ViewPosition.createBefore( viewItem ) );\n\tviewWriter.breakContainer( ViewPosition.createAfter( viewItem ) );\n\n\t// 2. Extract view list with changed view list item and merge \"hole\" possibly created by breaking and removing elements.\n\tconst viewList = viewItem.parent;\n\tconst viewListPrev = viewList.previousSibling;\n\tconst removeRange = ViewRange.createOn( viewList );\n\tviewWriter.remove( removeRange );\n\n\tif ( viewListPrev && viewListPrev.nextSibling ) {\n\t\tmergeViewLists( viewWriter, viewListPrev, viewListPrev.nextSibling );\n\t}\n\n\t// 3. Bring back nested list that was in the removed <li>.\n\thoistNestedLists( data.attributeOldValue + 1, data.range.start, removeRange.start, viewItem, conversionApi );\n\n\t// 4. Inject view list like it is newly inserted.\n\tinjectViewList( data.item, viewItem, conversionApi );\n\n\t// 5. Consume insertion of children inside the item. They are already handled by re-building the item in view.\n\tfor ( const child of data.item.getChildren() ) {\n\t\tconversionApi.consumable.consume( child, 'insert' );\n\t}\n}\n\n/**\n * A special model-to-view converter introduced by the {@link module:list/list~List list feature}. This converter is fired for\n * insert change of every model item, and should be fired before the actual converter. The converter checks whether the inserted\n * model item is a non-`listItem` element. If it is, and it is inserted inside a view list, the converter breaks the\n * list so the model element is inserted to the view parent element corresponding to its model parent element.\n *\n * The converter prevents such situations:\n *\n *\t\t// Model:                        // View:\n *\t\t<listItem>foo</listItem>         <ul>\n *\t\t<listItem>bar</listItem>             <li>foo</li>\n *\t\t                                     <li>bar</li>\n *\t\t                                 </ul>\n *\n *\t\t// After change:                 // Correct view guaranteed by this converter:\n *\t\t<listItem>foo</listItem>         <ul><li>foo</li></ul><p>xxx</p><ul><li>bar</li></ul>\n *\t\t<paragraph>xxx</paragraph>       // Instead of this wrong view state:\n *\t\t<listItem>bar</listItem>         <ul><li>foo</li><p>xxx</p><li>bar</li></ul>\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:insert\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewSplitOnInsert( evt, data, conversionApi ) {\n\tif ( data.item.name != 'listItem' ) {\n\t\tlet viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst lists = [];\n\n\t\t// Break multiple ULs/OLs if there are.\n\t\t//\n\t\t// Imagine following list:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1 --------\n\t\t//     1.1.1 --------\n\t\t//     1.1.2 --------\n\t\t//     1.1.3 --------\n\t\t//       1.1.3.1 --------\n\t\t//   1.2 --------\n\t\t//     1.2.1 --------\n\t\t// 2 --------\n\t\t//\n\t\t// Insert paragraph after item 1.1.1:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1 --------\n\t\t//     1.1.1 --------\n\t\t//\n\t\t// Lorem ipsum.\n\t\t//\n\t\t//     1.1.2 --------\n\t\t//     1.1.3 --------\n\t\t//       1.1.3.1 --------\n\t\t//   1.2 --------\n\t\t//     1.2.1 --------\n\t\t// 2 --------\n\t\t//\n\t\t// In this case 1.1.2 has to become beginning of a new list.\n\t\t// We need to break list before 1.1.2 (obvious), then we need to break list also before 1.2.\n\t\t// Then we need to move those broken pieces one after another and merge:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1 --------\n\t\t//     1.1.1 --------\n\t\t//\n\t\t// Lorem ipsum.\n\t\t//\n\t\t// 1.1.2 --------\n\t\t//   1.1.3 --------\n\t\t//     1.1.3.1 --------\n\t\t// 1.2 --------\n\t\t//   1.2.1 --------\n\t\t// 2 --------\n\t\t//\n\t\twhile ( viewPosition.parent.name == 'ul' || viewPosition.parent.name == 'ol' ) {\n\t\t\tviewPosition = viewWriter.breakContainer( viewPosition );\n\n\t\t\tif ( viewPosition.parent.name != 'li' ) {\n\t\t\t\tbreak;\n\t\t\t}\n\n\t\t\t// Remove lists that are after inserted element.\n\t\t\t// They will be brought back later, below the inserted element.\n\t\t\tconst removeStart = viewPosition;\n\t\t\tconst removeEnd = ViewPosition.createAt( viewPosition.parent, 'end' );\n\n\t\t\t// Don't remove if there is nothing to remove.\n\t\t\tif ( !removeStart.isEqual( removeEnd ) ) {\n\t\t\t\tconst removed = viewWriter.remove( new ViewRange( removeStart, removeEnd ) );\n\t\t\t\tlists.push( removed );\n\t\t\t}\n\n\t\t\tviewPosition = ViewPosition.createAfter( viewPosition.parent );\n\t\t}\n\n\t\t// Bring back removed lists.\n\t\tif ( lists.length > 0 ) {\n\t\t\tfor ( let i = 0; i < lists.length; i++ ) {\n\t\t\t\tconst previousList = viewPosition.nodeBefore;\n\t\t\t\tconst insertedRange = viewWriter.insert( viewPosition, lists[ i ] );\n\t\t\t\tviewPosition = insertedRange.end;\n\n\t\t\t\t// Don't merge first list! We want a split in that place (this is why this converter is introduced).\n\t\t\t\tif ( i > 0 ) {\n\t\t\t\t\tconst mergePos = mergeViewLists( viewWriter, previousList, previousList.nextSibling );\n\n\t\t\t\t\t// If `mergePos` is in `previousList` it means that the lists got merged.\n\t\t\t\t\t// In this case, we need to fix insert position.\n\t\t\t\t\tif ( mergePos && mergePos.parent == previousList ) {\n\t\t\t\t\t\tviewPosition.offset--;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Merge last inserted list with element after it.\n\t\t\tmergeViewLists( viewWriter, viewPosition.nodeBefore, viewPosition.nodeAfter );\n\t\t}\n\t}\n}\n\n/**\n * A special model-to-view converter introduced by the {@link module:list/list~List list feature}. This converter takes care of\n * merging view lists after something is removed or moved from near them.\n *\n * Example:\n *\n *\t\t// Model:                        // View:\n *\t\t<listItem>foo</listItem>         <ul><li>foo</li></ul>\n *\t\t<paragraph>xxx</paragraph>       <p>xxx</p>\n *\t\t<listItem>bar</listItem>         <ul><li>bar</li></ul>\n *\n *\t\t// After change:                 // Correct view guaranteed by this converter:\n *\t\t<listItem>foo</listItem>         <ul>\n *\t\t<listItem>bar</listItem>             <li>foo</li>\n *\t\t                                     <li>bar</li>\n *\t\t                                 </ul>\n *\n * @see module:engine/conversion/downcastdispatcher~DowncastDispatcher#event:remove\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data Additional information about the change.\n * @param {Object} conversionApi Conversion interface.\n */\nexport function modelViewMergeAfter( evt, data, conversionApi ) {\n\tconst viewPosition = conversionApi.mapper.toViewPosition( data.position );\n\tconst viewItemPrev = viewPosition.nodeBefore;\n\tconst viewItemNext = viewPosition.nodeAfter;\n\n\t// Merge lists if something (remove, move) was done from inside of list.\n\t// Merging will be done only if both items are view lists of the same type.\n\t// The check is done inside the helper function.\n\tmergeViewLists( conversionApi.writer, viewItemPrev, viewItemNext );\n}\n\n/**\n * A view-to-model converter that converts `<li>` view elements into `listItem` model elements.\n *\n * To set correct values of the `listType` and `listIndent` attributes the converter:\n * * checks `<li>`'s parent,\n * * stores and increases the `conversionApi.store.indent` value when `<li>`'s sub-items are converted.\n *\n * @see module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data An object containing conversion input and a placeholder for conversion output and possibly other values.\n * @param {Object} conversionApi Conversion interface to be used by the callback.\n */\nexport function viewModelConverter( evt, data, conversionApi ) {\n\tif ( conversionApi.consumable.consume( data.viewItem, { name: true } ) ) {\n\t\tconst writer = conversionApi.writer;\n\t\tconst conversionStore = this.conversionApi.store;\n\n\t\t// 1. Create `listItem` model element.\n\t\tconst listItem = writer.createElement( 'listItem' );\n\n\t\t// 2. Handle `listItem` model element attributes.\n\t\tconversionStore.indent = conversionStore.indent || 0;\n\t\twriter.setAttribute( 'listIndent', conversionStore.indent, listItem );\n\n\t\t// Set 'bulleted' as default. If this item is pasted into a context,\n\t\tconst type = data.viewItem.parent && data.viewItem.parent.name == 'ol' ? 'numbered' : 'bulleted';\n\t\twriter.setAttribute( 'listType', type, listItem );\n\n\t\t// `listItem`s created recursively should have bigger indent.\n\t\tconversionStore.indent++;\n\n\t\t// Try to find allowed parent for list item.\n\t\tconst splitResult = conversionApi.splitToAllowedParent( listItem, data.modelCursor );\n\n\t\t// When there is no allowed parent it means that list item cannot be converted at current model position\n\t\t// and in any of position ancestors.\n\t\tif ( !splitResult ) {\n\t\t\treturn;\n\t\t}\n\n\t\twriter.insert( listItem, splitResult.position );\n\n\t\t// Remember position after list item, next list items will be inserted at this position.\n\t\tlet nextPosition = ModelPosition.createAfter( listItem );\n\n\t\t// Check all children of the converted `<li>`.\n\t\t// At this point we assume there are no \"whitespace\" view text nodes in view list, between view list items.\n\t\t// This should be handled by `<ul>` and `<ol>` converters.\n\t\tfor ( const child of data.viewItem.getChildren() ) {\n\t\t\t// If this is a view list element, we will convert it after last `listItem` model element.\n\t\t\tif ( child.name == 'ul' || child.name == 'ol' ) {\n\t\t\t\tnextPosition = conversionApi.convertItem( child, nextPosition ).modelCursor;\n\t\t\t}\n\t\t\t// If it was not a list it was a \"regular\" list item content. Just convert it to `listItem`.\n\t\t\telse {\n\t\t\t\tconversionApi.convertItem( child, ModelPosition.createAt( listItem, 'end' ) );\n\t\t\t}\n\t\t}\n\n\t\tconversionStore.indent--;\n\n\t\t// Result range starts before the first item and ends after the last.\n\t\tdata.modelRange = new ModelRange( data.modelCursor, nextPosition );\n\n\t\t// When modelCursor parent had to be split to insert list item.\n\t\tif ( splitResult.cursorParent ) {\n\t\t\t// Then continue conversion in split element.\n\t\t\tdata.modelCursor = ModelPosition.createAt( splitResult.cursorParent );\n\t\t} else {\n\t\t\t// Otherwise continue conversion after last list item.\n\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t}\n\t}\n}\n\n/**\n * A view-to-model converter for `<ul>` and `<ol>` view elements that cleans the input view of garbage.\n * This is mostly to clean whitespaces from between `<li>` view elements inside the view list element, however, also\n * incorrect data can be cleared if the view was incorrect.\n *\n * @see module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data An object containing conversion input and a placeholder for conversion output and possibly other values.\n * @param {Object} conversionApi Conversion interface to be used by the callback.\n */\nexport function cleanList( evt, data, conversionApi ) {\n\tif ( conversionApi.consumable.test( data.viewItem, { name: true } ) ) {\n\t\t// Caching children because when we start removing them iterating fails.\n\t\tconst children = Array.from( data.viewItem.getChildren() );\n\n\t\tfor ( const child of children ) {\n\t\t\tif ( !child.is( 'li' ) ) {\n\t\t\t\tchild._remove();\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * A view-to-model converter for `<li>` elements that cleans whitespace formatting from the input view.\n *\n * @see module:engine/conversion/upcastdispatcher~UpcastDispatcher#event:element\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data An object containing conversion input and a placeholder for conversion output and possibly other values.\n * @param {Object} conversionApi Conversion interface to be used by the callback.\n */\nexport function cleanListItem( evt, data, conversionApi ) {\n\tif ( conversionApi.consumable.test( data.viewItem, { name: true } ) ) {\n\t\tif ( data.viewItem.childCount === 0 ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst children = [ ...data.viewItem.getChildren() ];\n\n\t\tlet foundList = false;\n\t\tlet firstNode = true;\n\n\t\tfor ( const child of children ) {\n\t\t\tif ( foundList && !child.is( 'ul' ) && !child.is( 'ol' ) ) {\n\t\t\t\tchild._remove();\n\t\t\t}\n\n\t\t\tif ( child.is( 'text' ) ) {\n\t\t\t\t// If this is the first node and it's a text node, left-trim it.\n\t\t\t\tif ( firstNode ) {\n\t\t\t\t\tchild._data = child.data.replace( /^\\s+/, '' );\n\t\t\t\t}\n\n\t\t\t\t// If this is the last text node before <ul> or <ol>, right-trim it.\n\t\t\t\tif ( !child.nextSibling || ( child.nextSibling.is( 'ul' ) || child.nextSibling.is( 'ol' ) ) ) {\n\t\t\t\t\tchild._data = child.data.replace( /\\s+$/, '' );\n\t\t\t\t}\n\t\t\t} else if ( child.is( 'ul' ) || child.is( 'ol' ) ) {\n\t\t\t\t// If this is a <ul> or <ol>, do not process it, just mark that we already visited list element.\n\t\t\t\tfoundList = true;\n\t\t\t}\n\n\t\t\tfirstNode = false;\n\t\t}\n\t}\n}\n\n/**\n * The callback for model position to view position mapping for {@link module:engine/conversion/mapper~Mapper}. The callback fixes\n * positions between `listItem` elements that would be incorrectly mapped because of how list items are represented in model\n * and view.\n *\n * @see module:engine/conversion/mapper~Mapper#event:modelToViewPosition\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data An object containing additional data and placeholder for mapping result.\n */\nexport function modelToViewPosition( evt, data ) {\n\tif ( data.isPhantom ) {\n\t\treturn;\n\t}\n\n\tconst modelItem = data.modelPosition.nodeBefore;\n\n\tif ( modelItem && modelItem.is( 'listItem' ) ) {\n\t\tconst viewItem = data.mapper.toViewElement( modelItem );\n\t\tconst topmostViewList = viewItem.getAncestors().find( element => element.is( 'ul' ) || element.is( 'ol' ) );\n\t\tconst walker = new ViewTreeWalker( {\n\t\t\tstartPosition: ViewPosition.createAt( viewItem, 0 )\n\t\t} );\n\n\t\tfor ( const value of walker ) {\n\t\t\tif ( value.type == 'elementStart' && value.item.is( 'li' ) ) {\n\t\t\t\tdata.viewPosition = value.previousPosition;\n\n\t\t\t\tbreak;\n\t\t\t} else if ( value.type == 'elementEnd' && value.item == topmostViewList ) {\n\t\t\t\tdata.viewPosition = value.nextPosition;\n\n\t\t\t\tbreak;\n\t\t\t}\n\t\t}\n\t}\n}\n\n/**\n * The callback for view position to model position mapping for {@link module:engine/conversion/mapper~Mapper}. The callback fixes\n * positions between `<li>` elements that would be incorrectly mapped because of how list items are represented in model\n * and view.\n *\n * @see module:engine/conversion/mapper~Mapper#event:viewToModelPosition\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Object} data An object containing additional data and placeholder for mapping result.\n */\nexport function viewToModelPosition( evt, data ) {\n\tconst viewPos = data.viewPosition;\n\tconst viewParent = viewPos.parent;\n\tconst mapper = data.mapper;\n\n\tif ( viewParent.name == 'ul' || viewParent.name == 'ol' ) {\n\t\t// Position is directly in <ul> or <ol>.\n\t\tif ( !viewPos.isAtEnd ) {\n\t\t\t// If position is not at the end, it must be before <li>.\n\t\t\t// Get that <li>, map it to `listItem` and set model position before that `listItem`.\n\t\t\tconst modelNode = mapper.toModelElement( viewPos.nodeAfter );\n\n\t\t\tdata.modelPosition = ModelPosition.createBefore( modelNode );\n\t\t} else {\n\t\t\t// Position is at the end of <ul> or <ol>, so there is no <li> after it to be mapped.\n\t\t\t// There is <li> before the position, but we cannot just map it to `listItem` and set model position after it,\n\t\t\t// because that <li> may contain nested items.\n\t\t\t// We will check \"model length\" of that <li>, in other words - how many `listItem`s are in that <li>.\n\t\t\tconst modelNode = mapper.toModelElement( viewPos.nodeBefore );\n\t\t\tconst modelLength = mapper.getModelLength( viewPos.nodeBefore );\n\n\t\t\t// Then we get model position before mapped `listItem` and shift it accordingly.\n\t\t\tdata.modelPosition = ModelPosition.createBefore( modelNode ).getShiftedBy( modelLength );\n\t\t}\n\n\t\tevt.stop();\n\t} else if ( viewParent.name == 'li' && viewPos.nodeBefore && ( viewPos.nodeBefore.name == 'ul' || viewPos.nodeBefore.name == 'ol' ) ) {\n\t\t// In most cases when view position is in <li> it is in text and this is a correct position.\n\t\t// However, if position is after <ul> or <ol> we have to fix it -- because in model <ul>/<ol> are not in the `listItem`.\n\t\tconst modelNode = mapper.toModelElement( viewParent );\n\n\t\t// Check all <ul>s and <ol>s that are in the <li> but before mapped position.\n\t\t// Get model length of those elements and then add it to the offset of `listItem` mapped to the original <li>.\n\t\tlet modelLength = 1; // Starts from 1 because the original <li> has to be counted in too.\n\t\tlet viewList = viewPos.nodeBefore;\n\n\t\twhile ( viewList && ( viewList.is( 'ul' ) || viewList.is( 'ol' ) ) ) {\n\t\t\tmodelLength += mapper.getModelLength( viewList );\n\n\t\t\tviewList = viewList.previousSibling;\n\t\t}\n\n\t\tdata.modelPosition = ModelPosition.createBefore( modelNode ).getShiftedBy( modelLength );\n\n\t\tevt.stop();\n\t}\n}\n\n/**\n * Post-fixer that reacts to changes on document and fixes incorrect model states.\n *\n * In an example below, there is a correct list structure.\n * Then the middle element will be removed so the list structure will become incorrect:\n *\n *\t\t<listItem listType=\"bulleted\" listIndent=0>Item 1</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=1>Item 2</listItem>   <--- this is removed.\n *\t\t<listItem listType=\"bulleted\" listIndent=2>Item 3</listItem>\n *\n * List structure after the middle element removed:\n *\n * \t\t<listItem listType=\"bulleted\" listIndent=0>Item 1</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=2>Item 3</listItem>\n *\n * Should become:\n *\n *\t\t<listItem listType=\"bulleted\" listIndent=0>Item 1</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=1>Item 3</listItem>   <--- note that indent got post-fixed.\n *\n * @param {module:engine/model/model~Model} model The data model.\n * @param {module:engine/model/writer~Writer} writer The writer to do changes with.\n * @returns {Boolean} `true` if any change has been applied, `false` otherwise.\n */\nexport function modelChangePostFixer( model, writer ) {\n\tconst changes = model.document.differ.getChanges();\n\tconst itemToListHead = new Map();\n\n\tlet applied = false;\n\n\tfor ( const entry of changes ) {\n\t\tif ( entry.type == 'insert' && entry.name == 'listItem' ) {\n\t\t\t_addListToFix( entry.position );\n\t\t} else if ( entry.type == 'insert' && entry.name != 'listItem' ) {\n\t\t\tif ( entry.name != '$text' ) {\n\t\t\t\t// In case of renamed element.\n\t\t\t\tconst item = entry.position.nodeAfter;\n\n\t\t\t\tif ( item.hasAttribute( 'listIndent' ) ) {\n\t\t\t\t\twriter.removeAttribute( 'listIndent', item );\n\n\t\t\t\t\tapplied = true;\n\t\t\t\t}\n\n\t\t\t\tif ( item.hasAttribute( 'listType' ) ) {\n\t\t\t\t\twriter.removeAttribute( 'listType', item );\n\n\t\t\t\t\tapplied = true;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tconst posAfter = entry.position.getShiftedBy( entry.length );\n\n\t\t\t_addListToFix( posAfter );\n\t\t} else if ( entry.type == 'remove' && entry.name == 'listItem' ) {\n\t\t\t_addListToFix( entry.position );\n\t\t} else if ( entry.type == 'attribute' && entry.attributeKey == 'listIndent' ) {\n\t\t\t_addListToFix( entry.range.start );\n\t\t} else if ( entry.type == 'attribute' && entry.attributeKey == 'listType' ) {\n\t\t\t_addListToFix( entry.range.start );\n\t\t}\n\t}\n\n\tfor ( const listHead of itemToListHead.values() ) {\n\t\t_fixListIndents( listHead );\n\t\t_fixListTypes( listHead );\n\t}\n\n\treturn applied;\n\n\tfunction _addListToFix( position ) {\n\t\tconst prev = position.nodeBefore;\n\n\t\tif ( !prev || !prev.is( 'listItem' ) ) {\n\t\t\tconst item = position.nodeAfter;\n\n\t\t\tif ( item && item.is( 'listItem' ) ) {\n\t\t\t\titemToListHead.set( item, item );\n\t\t\t}\n\t\t} else {\n\t\t\tlet listHead = prev;\n\n\t\t\tif ( itemToListHead.has( listHead ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\twhile ( listHead.previousSibling && listHead.previousSibling.is( 'listItem' ) ) {\n\t\t\t\tlistHead = listHead.previousSibling;\n\n\t\t\t\tif ( itemToListHead.has( listHead ) ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\titemToListHead.set( position.nodeBefore, listHead );\n\t\t}\n\t}\n\n\tfunction _fixListIndents( item ) {\n\t\tlet maxIndent = 0;\n\t\tlet fixBy = null;\n\n\t\twhile ( item && item.is( 'listItem' ) ) {\n\t\t\tconst itemIndent = item.getAttribute( 'listIndent' );\n\n\t\t\tif ( itemIndent > maxIndent ) {\n\t\t\t\tlet newIndent;\n\n\t\t\t\tif ( fixBy === null ) {\n\t\t\t\t\tfixBy = itemIndent - maxIndent;\n\t\t\t\t\tnewIndent = maxIndent;\n\t\t\t\t} else {\n\t\t\t\t\tif ( fixBy > itemIndent ) {\n\t\t\t\t\t\tfixBy = itemIndent;\n\t\t\t\t\t}\n\n\t\t\t\t\tnewIndent = itemIndent - fixBy;\n\t\t\t\t}\n\n\t\t\t\twriter.setAttribute( 'listIndent', newIndent, item );\n\n\t\t\t\tapplied = true;\n\t\t\t} else {\n\t\t\t\tfixBy = null;\n\t\t\t\tmaxIndent = item.getAttribute( 'listIndent' ) + 1;\n\t\t\t}\n\n\t\t\titem = item.nextSibling;\n\t\t}\n\t}\n\n\tfunction _fixListTypes( item ) {\n\t\tlet typesStack = [];\n\t\tlet prev = null;\n\n\t\twhile ( item && item.is( 'listItem' ) ) {\n\t\t\tconst itemIndent = item.getAttribute( 'listIndent' );\n\n\t\t\tif ( prev && prev.getAttribute( 'listIndent' ) > itemIndent ) {\n\t\t\t\ttypesStack = typesStack.slice( 0, itemIndent + 1 );\n\t\t\t}\n\n\t\t\tif ( itemIndent != 0 ) {\n\t\t\t\tif ( typesStack[ itemIndent ] ) {\n\t\t\t\t\tconst type = typesStack[ itemIndent ];\n\n\t\t\t\t\tif ( item.getAttribute( 'listType' ) != type ) {\n\t\t\t\t\t\twriter.setAttribute( 'listType', type, item );\n\n\t\t\t\t\t\tapplied = true;\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\ttypesStack[ itemIndent ] = item.getAttribute( 'listType' );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tprev = item;\n\t\t\titem = item.nextSibling;\n\t\t}\n\t}\n}\n\n/**\n * A fixer for pasted content that includes list items.\n *\n * It fixes indentation of pasted list items so the pasted items match correctly to the context they are pasted into.\n *\n * Example:\n *\n *\t\t<listItem listType=\"bulleted\" listIndent=0>A</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=1>B^</listItem>\n *\t\t// At ^ paste:  <listItem listType=\"bulleted\" listIndent=4>X</listItem>\n *\t\t//              <listItem listType=\"bulleted\" listIndent=5>Y</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=2>C</listItem>\n *\n * Should become:\n *\n *\t\t<listItem listType=\"bulleted\" listIndent=0>A</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=1>BX</listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=2>Y/listItem>\n *\t\t<listItem listType=\"bulleted\" listIndent=2>C</listItem>\n *\n * @param {module:utils/eventinfo~EventInfo} evt An object containing information about the fired event.\n * @param {Array} args Arguments of {@link module:engine/model/model~Model#insertContent}.\n */\nexport function modelIndentPasteFixer( evt, [ content, selection ] ) {\n\t// Check whether inserted content starts from a `listItem`. If it does not, it means that there are some other\n\t// elements before it and there is no need to fix indents, because even if we insert that content into a list,\n\t// that list will be broken.\n\t// Note: we also need to handle singular elements because inserting item with indent 0 into 0,1,[],2\n\t// would create incorrect model.\n\tlet item = content.is( 'documentFragment' ) ? content.getChild( 0 ) : content;\n\n\tif ( item && item.is( 'listItem' ) ) {\n\t\t// Get a reference list item. Inserted list items will be fixed according to that item.\n\t\tconst pos = selection.getFirstPosition();\n\t\tlet refItem = null;\n\n\t\tif ( pos.parent.is( 'listItem' ) ) {\n\t\t\trefItem = pos.parent;\n\t\t} else if ( pos.nodeBefore && pos.nodeBefore.is( 'listItem' ) ) {\n\t\t\trefItem = pos.nodeBefore;\n\t\t}\n\n\t\t// If there is `refItem` it means that we do insert list items into an existing list.\n\t\tif ( refItem ) {\n\t\t\t// First list item in `data` has indent equal to 0 (it is a first list item). It should have indent equal\n\t\t\t// to the indent of reference item. We have to fix the first item and all of it's children and following siblings.\n\t\t\t// Indent of all those items has to be adjusted to reference item.\n\t\t\tconst indentChange = refItem.getAttribute( 'listIndent' );\n\n\t\t\t// Fix only if there is anything to fix.\n\t\t\tif ( indentChange > 0 ) {\n\t\t\t\t// Adjust indent of all \"first\" list items in inserted data.\n\t\t\t\twhile ( item && item.is( 'listItem' ) ) {\n\t\t\t\t\titem._setAttribute( 'listIndent', item.getAttribute( 'listIndent' ) + indentChange );\n\n\t\t\t\t\titem = item.nextSibling;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n}\n\n// Helper function that creates a `<ul><li></li></ul>` or (`<ol>`) structure out of given `modelItem` model `listItem` element.\n// Then, it binds created view list item (<li>) with model `listItem` element.\n// The function then returns created view list item (<li>).\nfunction generateLiInUl( modelItem, conversionApi ) {\n\tconst mapper = conversionApi.mapper;\n\tconst viewWriter = conversionApi.writer;\n\tconst listType = modelItem.getAttribute( 'listType' ) == 'numbered' ? 'ol' : 'ul';\n\tconst viewItem = createViewListItemElement( viewWriter );\n\n\tconst viewList = viewWriter.createContainerElement( listType, null );\n\tviewWriter.insert( ViewPosition.createAt( viewList ), viewItem );\n\n\tmapper.bindElements( modelItem, viewItem );\n\n\treturn viewItem;\n}\n\n// Helper function that seeks for a list item sibling of given model item (or position) which meets given criteria.\n// `options` object may contain one or more of given values (by default they are `false`):\n// `options.sameIndent` - whether sought sibling should have same indent (default = no),\n// `options.smallerIndent` - whether sought sibling should have smaller indent (default = no).\n// `options.indent` - used as reference item when first parameter is a position\n// Either `options.sameIndent` or `options.biggerIndent` should be set to `true`.\nfunction getSiblingListItem( modelItemOrPosition, options ) {\n\tconst sameIndent = !!options.sameIndent;\n\tconst smallerIndent = !!options.smallerIndent;\n\n\tconst indent = modelItemOrPosition instanceof ModelElement ? modelItemOrPosition.getAttribute( 'listIndent' ) : options.listIndent;\n\tlet item = modelItemOrPosition instanceof ModelElement ? modelItemOrPosition.previousSibling : modelItemOrPosition.nodeBefore;\n\n\twhile ( item && item.name == 'listItem' ) {\n\t\tconst itemIndent = item.getAttribute( 'listIndent' );\n\n\t\tif ( ( sameIndent && indent == itemIndent ) || ( smallerIndent && indent > itemIndent ) ) {\n\t\t\treturn item;\n\t\t}\n\n\t\titem = item.previousSibling;\n\t}\n\n\treturn null;\n}\n\n// Helper function that takes two parameters, that are expected to be view list elements, and merges them.\n// The merge happen only if both parameters are UL or OL elements.\nfunction mergeViewLists( viewWriter, firstList, secondList ) {\n\tif ( firstList && secondList && ( firstList.name == 'ul' || firstList.name == 'ol' ) && firstList.name == secondList.name ) {\n\t\treturn viewWriter.mergeContainers( ViewPosition.createAfter( firstList ) );\n\t}\n\n\treturn null;\n}\n\n// Helper function that takes model list item element `modelItem`, corresponding view list item element `injectedItem`\n// that is not added to the view and is inside a view list element (`ul` or `ol`) and is that's list only child.\n// The list is inserted at correct position (element breaking may be needed) and then merged with it's siblings.\n// See comments below to better understand the algorithm.\nfunction injectViewList( modelItem, injectedItem, conversionApi ) {\n\tconst injectedList = injectedItem.parent;\n\tconst mapper = conversionApi.mapper;\n\tconst viewWriter = conversionApi.writer;\n\n\t// Position where view list will be inserted.\n\tlet insertPosition = mapper.toViewPosition( ModelPosition.createBefore( modelItem ) );\n\n\t// 1. Find previous list item that has same or smaller indent. Basically we are looking for a first model item\n\t// that is \"parent\" or \"sibling\" of injected model item.\n\t// If there is no such list item, it means that injected list item is the first item in \"its list\".\n\tconst refItem = getSiblingListItem( modelItem, { sameIndent: true, smallerIndent: true } );\n\tconst prevItem = modelItem.previousSibling;\n\n\tif ( refItem && refItem.getAttribute( 'listIndent' ) == modelItem.getAttribute( 'listIndent' ) ) {\n\t\t// There is a list item with same indent - we found same-level sibling.\n\t\t// Break the list after it. Inserted view item will be inserted in the broken space.\n\t\tconst viewItem = mapper.toViewElement( refItem );\n\t\tinsertPosition = viewWriter.breakContainer( ViewPosition.createAfter( viewItem ) );\n\t} else {\n\t\t// There is no list item with same indent. Check previous model item.\n\t\tif ( prevItem && prevItem.name == 'listItem' ) {\n\t\t\t// If it is a list item, it has to have lower indent.\n\t\t\t// It means that inserted item should be added to it as its nested item.\n\t\t\tinsertPosition = mapper.toViewPosition( ModelPosition.createAt( prevItem, 'end' ) );\n\t\t} else {\n\t\t\t// Previous item is not a list item (or does not exist at all).\n\t\t\t// Just map the position and insert the view item at mapped position.\n\t\t\tinsertPosition = mapper.toViewPosition( ModelPosition.createBefore( modelItem ) );\n\t\t}\n\t}\n\n\tinsertPosition = positionAfterUiElements( insertPosition );\n\n\t// Insert the view item.\n\tviewWriter.insert( insertPosition, injectedList );\n\n\t// 2. Handle possible children of injected model item.\n\tif ( prevItem && prevItem.name == 'listItem' ) {\n\t\tconst prevView = mapper.toViewElement( prevItem );\n\n\t\tconst walker = new ViewTreeWalker( {\n\t\t\tboundaries: new ViewRange(\n\t\t\t\tViewPosition.createAt( prevView, 0 ),\n\t\t\t\tinsertPosition\n\t\t\t),\n\t\t\tignoreElementEnd: true\n\t\t} );\n\n\t\tfor ( const value of walker ) {\n\t\t\tif ( value.item.is( 'li' ) ) {\n\t\t\t\tconst breakPosition = viewWriter.breakContainer( ViewPosition.createBefore( value.item ) );\n\t\t\t\tconst viewList = value.item.parent;\n\n\t\t\t\tconst targetPosition = ViewPosition.createAt( injectedItem, 'end' );\n\t\t\t\tmergeViewLists( viewWriter, targetPosition.nodeBefore, targetPosition.nodeAfter );\n\t\t\t\tviewWriter.move( ViewRange.createOn( viewList ), targetPosition );\n\n\t\t\t\twalker.position = breakPosition;\n\t\t\t}\n\t\t}\n\t} else {\n\t\tconst nextViewList = injectedList.nextSibling;\n\n\t\tif ( nextViewList && ( nextViewList.is( 'ul' ) || nextViewList.is( 'ol' ) ) ) {\n\t\t\tlet lastSubChild = null;\n\n\t\t\tfor ( const child of nextViewList.getChildren() ) {\n\t\t\t\tconst modelChild = mapper.toModelElement( child );\n\n\t\t\t\tif ( modelChild && modelChild.getAttribute( 'listIndent' ) > modelItem.getAttribute( 'listIndent' ) ) {\n\t\t\t\t\tlastSubChild = child;\n\t\t\t\t} else {\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( lastSubChild ) {\n\t\t\t\tviewWriter.breakContainer( ViewPosition.createAfter( lastSubChild ) );\n\t\t\t\tviewWriter.move( ViewRange.createOn( lastSubChild.parent ), ViewPosition.createAt( injectedItem, 'end' ) );\n\t\t\t}\n\t\t}\n\t}\n\n\t// Merge inserted view list with its possible neighbour lists.\n\tmergeViewLists( viewWriter, injectedList, injectedList.nextSibling );\n\tmergeViewLists( viewWriter, injectedList.previousSibling, injectedList );\n}\n\n// Helper function that takes all children of given `viewRemovedItem` and moves them in a correct place, according\n// to other given parameters.\nfunction hoistNestedLists( nextIndent, modelRemoveStartPosition, viewRemoveStartPosition, viewRemovedItem, conversionApi ) {\n\t// Find correct previous model list item element.\n\t// The element has to have either same or smaller indent than given reference indent.\n\t// This will be the model element which will get nested items (if it has smaller indent) or sibling items (if it has same indent).\n\t// Keep in mind that such element might not be found, if removed item was the first item.\n\tconst prevModelItem = getSiblingListItem( modelRemoveStartPosition, {\n\t\tsameIndent: true,\n\t\tsmallerIndent: true,\n\t\tlistIndent: nextIndent\n\t} );\n\n\tconst mapper = conversionApi.mapper;\n\tconst viewWriter = conversionApi.writer;\n\n\t// Indent of found element or `null` if the element has not been found.\n\tconst prevIndent = prevModelItem ? prevModelItem.getAttribute( 'listIndent' ) : null;\n\n\tlet insertPosition;\n\n\tif ( !prevModelItem ) {\n\t\t// If element has not been found, simply insert lists at the position where the removed item was:\n\t\t//\n\t\t// Lorem ipsum.\n\t\t// 1 --------           <--- this is removed, no previous list item, put nested items in place of removed item.\n\t\t//   1.1 --------       <--- this is reference indent.\n\t\t//     1.1.1 --------\n\t\t//     1.1.2 --------\n\t\t//   1.2 --------\n\t\t//\n\t\t// Becomes:\n\t\t//\n\t\t// Lorem ipsum.\n\t\t// 1.1 --------\n\t\t//   1.1.1 --------\n\t\t//   1.1.2 --------\n\t\t// 1.2 --------\n\t\tinsertPosition = viewRemoveStartPosition;\n\t} else if ( prevIndent == nextIndent ) {\n\t\t// If element has been found and has same indent as reference indent it means that nested items should\n\t\t// become siblings of found element:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1 --------\n\t\t//   1.2 --------       <--- this is `prevModelItem`.\n\t\t// 2 --------           <--- this is removed, previous list item has indent same as reference indent.\n\t\t//   2.1 --------       <--- this is reference indent, this and 2.2 should become siblings of 1.2.\n\t\t//   2.2 --------\n\t\t//\n\t\t// Becomes:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1 --------\n\t\t//   1.2 --------\n\t\t//   2.1 --------\n\t\t//   2.2 --------\n\t\tconst prevViewList = mapper.toViewElement( prevModelItem ).parent;\n\t\tinsertPosition = ViewPosition.createAfter( prevViewList );\n\t} else {\n\t\t// If element has been found and has smaller indent as reference indent it means that nested items\n\t\t// should become nested items of found item:\n\t\t//\n\t\t// 1 --------           <--- this is `prevModelItem`.\n\t\t//   1.1 --------       <--- this is removed, previous list item has indent smaller than reference indent.\n\t\t//     1.1.1 --------   <--- this is reference indent, this and 1.1.1 should become nested items of 1.\n\t\t//     1.1.2 --------\n\t\t//   1.2 --------\n\t\t//\n\t\t// Becomes:\n\t\t//\n\t\t// 1 --------\n\t\t//   1.1.1 --------\n\t\t//   1.1.2 --------\n\t\t//   1.2 --------\n\t\t//\n\t\t// Note: in this case 1.1.1 have indent 2 while 1 have indent 0. In model that should not be possible,\n\t\t// because following item may have indent bigger only by one. But this is fixed by postfixer.\n\t\tconst modelPosition = ModelPosition.createAt( prevModelItem, 'end' );\n\t\tinsertPosition = mapper.toViewPosition( modelPosition );\n\t}\n\n\tinsertPosition = positionAfterUiElements( insertPosition );\n\n\t// Handle multiple lists. This happens if list item has nested numbered and bulleted lists. Following lists\n\t// are inserted after the first list (no need to recalculate insertion position for them).\n\tfor ( const child of [ ...viewRemovedItem.getChildren() ] ) {\n\t\tif ( child.is( 'ul' ) || child.is( 'ol' ) ) {\n\t\t\tinsertPosition = viewWriter.move( ViewRange.createOn( child ), insertPosition ).end;\n\n\t\t\tmergeViewLists( viewWriter, child, child.nextSibling );\n\t\t\tmergeViewLists( viewWriter, child.previousSibling, child );\n\t\t}\n\t}\n}\n\n// Helper function that for given `view.Position`, returns a `view.Position` that is after all `view.UIElement`s that\n// are after given position.\n// For example:\n// <container:p>foo^<ui:span></ui:span><ui:span></ui:span>bar</contain:p>\n// For position ^, a position before \"bar\" will be returned.\nfunction positionAfterUiElements( viewPosition ) {\n\treturn viewPosition.getLastMatchingPosition( value => value.item.is( 'uiElement' ) );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/listediting\n */\n\nimport ListCommand from './listcommand';\nimport IndentCommand from './indentcommand';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Paragraph from '@ckeditor/ckeditor5-paragraph/src/paragraph';\n\nimport {\n\tcleanList,\n\tcleanListItem,\n\tmodelViewInsertion,\n\tmodelViewChangeType,\n\tmodelViewMergeAfter,\n\tmodelViewRemove,\n\tmodelViewSplitOnInsert,\n\tmodelViewChangeIndent,\n\tmodelChangePostFixer,\n\tmodelIndentPasteFixer,\n\tviewModelConverter,\n\tmodelToViewPosition,\n\tviewToModelPosition\n} from './converters';\n\n/**\n * The engine of the list feature. It handles creating, editing and removing lists and list items.\n * It registers the `numberedList`, `bulletedList`, `indentList` and `outdentList` commands.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ListEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ Paragraph ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\t// Schema.\n\t\t// Note: in case `$block` will ever be allowed in `listItem`, keep in mind that this feature\n\t\t// uses `Selection#getSelectedBlocks()` without any additional processing to obtain all selected list items.\n\t\t// If there are blocks allowed inside list item, algorithms using `getSelectedBlocks()` will have to be modified.\n\t\teditor.model.schema.register( 'listItem', {\n\t\t\tinheritAllFrom: '$block',\n\t\t\tallowAttributes: [ 'listType', 'listIndent' ]\n\t\t} );\n\n\t\t// Converters.\n\t\tconst data = editor.data;\n\t\tconst editing = editor.editing;\n\n\t\teditor.model.document.registerPostFixer( writer => modelChangePostFixer( editor.model, writer ) );\n\n\t\tediting.mapper.registerViewToModelLength( 'li', getViewListItemLength );\n\t\tdata.mapper.registerViewToModelLength( 'li', getViewListItemLength );\n\n\t\tediting.mapper.on( 'modelToViewPosition', modelToViewPosition );\n\t\tediting.mapper.on( 'viewToModelPosition', viewToModelPosition );\n\t\tdata.mapper.on( 'modelToViewPosition', modelToViewPosition );\n\n\t\tediting.downcastDispatcher.on( 'insert', modelViewSplitOnInsert, { priority: 'high' } );\n\t\tediting.downcastDispatcher.on( 'insert:listItem', modelViewInsertion );\n\t\tdata.downcastDispatcher.on( 'insert', modelViewSplitOnInsert, { priority: 'high' } );\n\t\tdata.downcastDispatcher.on( 'insert:listItem', modelViewInsertion );\n\n\t\tediting.downcastDispatcher.on( 'attribute:listType:listItem', modelViewChangeType );\n\t\tdata.downcastDispatcher.on( 'attribute:listType:listItem', modelViewChangeType );\n\t\tediting.downcastDispatcher.on( 'attribute:listIndent:listItem', modelViewChangeIndent );\n\t\tdata.downcastDispatcher.on( 'attribute:listIndent:listItem', modelViewChangeIndent );\n\n\t\tediting.downcastDispatcher.on( 'remove:listItem', modelViewRemove );\n\t\tediting.downcastDispatcher.on( 'remove', modelViewMergeAfter, { priority: 'low' } );\n\t\tdata.downcastDispatcher.on( 'remove:listItem', modelViewRemove );\n\t\tdata.downcastDispatcher.on( 'remove', modelViewMergeAfter, { priority: 'low' } );\n\n\t\tdata.upcastDispatcher.on( 'element:ul', cleanList, { priority: 'high' } );\n\t\tdata.upcastDispatcher.on( 'element:ol', cleanList, { priority: 'high' } );\n\t\tdata.upcastDispatcher.on( 'element:li', cleanListItem, { priority: 'high' } );\n\t\tdata.upcastDispatcher.on( 'element:li', viewModelConverter );\n\n\t\t// Fix indentation of pasted items.\n\t\teditor.model.on( 'insertContent', modelIndentPasteFixer, { priority: 'high' } );\n\n\t\t// Register commands for numbered and bulleted list.\n\t\teditor.commands.add( 'numberedList', new ListCommand( editor, 'numbered' ) );\n\t\teditor.commands.add( 'bulletedList', new ListCommand( editor, 'bulleted' ) );\n\n\t\t// Register commands for indenting.\n\t\teditor.commands.add( 'indentList', new IndentCommand( editor, 'forward' ) );\n\t\teditor.commands.add( 'outdentList', new IndentCommand( editor, 'backward' ) );\n\n\t\tconst viewDocument = this.editor.editing.view.document;\n\n\t\t// Overwrite default Enter key behavior.\n\t\t// If Enter key is pressed with selection collapsed in empty list item, outdent it instead of breaking it.\n\t\tthis.listenTo( viewDocument, 'enter', ( evt, data ) => {\n\t\t\tconst doc = this.editor.model.document;\n\t\t\tconst positionParent = doc.selection.getLastPosition().parent;\n\n\t\t\tif ( doc.selection.isCollapsed && positionParent.name == 'listItem' && positionParent.isEmpty ) {\n\t\t\t\tthis.editor.execute( 'outdentList' );\n\n\t\t\t\tdata.preventDefault();\n\t\t\t\tevt.stop();\n\t\t\t}\n\t\t} );\n\n\t\t// Overwrite default Backspace key behavior.\n\t\t// If Backspace key is pressed with selection collapsed on first position in first list item, outdent it. #83\n\t\tthis.listenTo( viewDocument, 'delete', ( evt, data ) => {\n\t\t\t// Check conditions from those that require less computations like those immediately available.\n\t\t\tif ( data.direction !== 'backward' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst selection = this.editor.model.document.selection;\n\n\t\t\tif ( !selection.isCollapsed ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst firstPosition = selection.getFirstPosition();\n\n\t\t\tif ( !firstPosition.isAtStart ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst positionParent = firstPosition.parent;\n\n\t\t\tif ( positionParent.name !== 'listItem' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst previousIsAListItem = positionParent.previousSibling && positionParent.previousSibling.name === 'listItem';\n\n\t\t\tif ( previousIsAListItem ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tthis.editor.execute( 'outdentList' );\n\n\t\t\tdata.preventDefault();\n\t\t\tevt.stop();\n\t\t}, { priority: 'high' } );\n\n\t\tconst getCommandExecuter = commandName => {\n\t\t\treturn ( data, cancel ) => {\n\t\t\t\tconst command = this.editor.commands.get( commandName );\n\n\t\t\t\tif ( command.isEnabled ) {\n\t\t\t\t\tthis.editor.execute( commandName );\n\t\t\t\t\tcancel();\n\t\t\t\t}\n\t\t\t};\n\t\t};\n\n\t\tthis.editor.keystrokes.set( 'Tab', getCommandExecuter( 'indentList' ) );\n\t\tthis.editor.keystrokes.set( 'Shift+Tab', getCommandExecuter( 'outdentList' ) );\n\t}\n}\n\nfunction getViewListItemLength( element ) {\n\tlet length = 1;\n\n\tfor ( const child of element.getChildren() ) {\n\t\tif ( child.name == 'ul' || child.name == 'ol' ) {\n\t\t\tfor ( const item of child.getChildren() ) {\n\t\t\t\tlength += getViewListItemLength( item );\n\t\t\t}\n\t\t}\n\t}\n\n\treturn length;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module list/listui\n */\nimport numberedListIcon from '../theme/icons/numberedlist.svg';\nimport bulletedListIcon from '../theme/icons/bulletedlist.svg';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n/**\n * The list UI feature. It introduces the `numberedList` and `bulletedList` buttons that\n * allow to convert paragraphs to and from list items and indent or outdent them.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ListUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        // Create two buttons and link them with numberedList and bulletedList commands.\n        const t = this.editor.t;\n        this._addButton('numberedList', t('v'), numberedListIcon);\n        this._addButton('bulletedList', t('w'), bulletedListIcon);\n    }\n    /**\n\t * Helper method for initializing a button and linking it with an appropriate command.\n\t *\n\t * @private\n\t * @param {String} commandName The name of the command.\n\t * @param {Object} label The button label.\n\t * @param {String} icon The source of the icon.\n\t */\n    _addButton(commandName, label, icon) {\n        const editor = this.editor;\n        editor.ui.componentFactory.add(commandName, locale => {\n            const command = editor.commands.get(commandName);\n            const buttonView = new ButtonView(locale);\n            buttonView.set({\n                label,\n                icon,\n                tooltip: true\n            });\n            // Bind button model to command.\n            buttonView.bind('isOn', 'isEnabled').to(command, 'value', 'isEnabled');\n            // Execute command.\n            this.listenTo(buttonView, 'execute', () => editor.execute(commandName));\n            return buttonView;\n        });\n    }\n}","import ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport {toWidget, isWidget} from '@ckeditor/ckeditor5-widget/src/utils';\nimport {setContent} from './widget';\n\nconst codeBlockSymbol = Symbol( 'isOPCodeBlock' );\n\nexport function toCodeBlockWidget( viewElement, writer, label ) {\n\twriter.setCustomProperty( codeBlockSymbol, true, viewElement );\n\treturn toWidget( viewElement, writer, { label: label } );\n}\n\n\nexport function isCodeBlockWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( codeBlockSymbol ) && isWidget( viewElement );\n}\n\n\nexport function isCodeBlockWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isCodeBlockWidget( viewElement ) );\n}\n\nexport function createCodeBlockWidget( modelElement, writer, label ) {\n\tconst container = writer.createContainerElement(\n\t\t'div',\n\t\t{\n\t\t\tclass: 'op-ckeditor--code-block',\n\t\t\ttitle: window.I18n.t('js.editor.macro.toolbar_help')\n\t\t}\n\t);\n\trenderCodeBlockContent( writer, modelElement, container );\n\n\treturn toCodeBlockWidget( container, writer, label );\n}\n\nexport function renderCodeBlockContent( writer, modelElement, container ) {\n\t// Append language element\n\tconst languageClass = modelElement.getAttribute( 'opCodeblockLanguage' ) || 'language-text';\n\tconst language = languageClass.replace(/^language-/, '');\n\tconst langElement = writer.createContainerElement( 'div', { class: 'op-ckeditor--code-block-language' } );\n\tsetTextNode( writer, language, langElement, 'text' );\n\twriter.insert( ViewPosition.createAt( container ), langElement );\n\n\t// Append code block content\n\tconst content = modelElement.getAttribute( 'opCodeblockContent' );\n\tsetTextNode( writer, content, container, '(empty)' );\n}\n\nexport function setTextNode( writer, content, container, empty_text ) {\n    const placeholder = writer.createText( content || empty_text );\n    writer.insert( ViewPosition.createAt( container ), placeholder );\n}\n","import DomEventObserver from \"@ckeditor/ckeditor5-engine/src/view/observer/domeventobserver\";\n\nexport default class DoubleClickObserver extends DomEventObserver {\n\tconstructor( view ) {\n\t\tsuper( view );\n\n\t\tthis.domEventType = 'dblclick';\n\t}\n\n\tonDomEvent( domEvent ) {\n\t\tthis.fire( domEvent.type, domEvent );\n\t}\n}\n","import icon from '../../icons/code-block.svg';\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport {modelCodeBlockToView, viewCodeBlockToModel, codeBlockContentToView} from './converters';\nimport {downcastElementToElement} from '@ckeditor/ckeditor5-engine/src/conversion/downcast-converters';\nimport {createCodeBlockWidget, isCodeBlockWidget} from './widget';\nimport DoubleClickObserver from './click-observer';\n\nexport default class CodeBlockEditing extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'CodeBlockEditing';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst conversion = editor.conversion;\n\t\tconst view = editor.editing.view;\n\t\tconst viewDocument = view.document;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Configure schema.\n\t\tschema.register('codeblock', {\n\t\t\tisObject: true,\n\t\t\tisBlock: true,\n\t\t\tallowContentOf: '$block',\n\t\t\tallowWhere: ['$root', '$block'],\n\t\t\tallowIn: ['$root'],\n\t\t\tallowAttributes: ['opCodeblockLanguage', 'opCodeblockContent']\n\t\t});\n\n\t\tconversion.for( 'upcast' )\n\t\t\t.add(viewCodeBlockToModel());\n\n\t\tconversion.for( 'editingDowncast' )\n\t\t\t.add( downcastElementToElement({\n\t\t\t\tmodel: 'codeblock',\n\t\t\t\tview: (modelElement, viewWriter) => {\n\t\t\t\t\treturn createCodeBlockWidget( modelElement, viewWriter, 'Code block' );\n\t\t\t\t}\n\t\t\t}) )\n\t\t\t.add ( codeBlockContentToView() );\n\n\t\tconversion\n\t\t\t.for('dataDowncast')\n\t\t\t.add(modelCodeBlockToView());\n\n\t\t// Register click handler to code block to edit it immediately\n\t\tview.addObserver( DoubleClickObserver );\n\t\tthis.listenTo( viewDocument, 'dblclick', ( eventInfo, domEventData ) => {\n\t\t\tlet element = domEventData.target;\n\t\t\tlet evt = domEventData.domEvent;\n\n\t\t\t// Avoid opening the widget with modifiers selected to allow selecting the widget\n\t\t\tif (evt.shiftKey || evt.altKey || evt.metaKey) {\n\t\t\t\treturn;\n\t\t\t}\n\n\n\t\t\t// If target is our widget\n\t\t\tif ( !isCodeBlockWidget( element ) ) {\n\t\t\t\telement = element.findAncestor( isCodeBlockWidget );\n\n\t\t\t\tif ( !element ) {\n\t\t\t\t\treturn;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tdomEventData.preventDefault();\n\t\t\tdomEventData.stopPropagation();\n\n\t\t\t// Create model selection over widget.\n\t\t\tconst modelElement = editor.editing.mapper.toModelElement( element );\n\n\t\t\tconst macroService = pluginContext.services.macros;\n\t\t\tconst language = modelElement.getAttribute( 'opCodeblockLanguage' );\n\t\t\tconst content = modelElement.getAttribute( 'opCodeblockContent' );\n\n\t\t\tmacroService\n\t\t\t\t.editCodeBlock( content, language )\n\t\t\t\t.then((update) => editor.model.change(writer => {\n\t\t\t\t\twriter.setAttribute( 'opCodeblockLanguage', update.languageClass, modelElement );\n\t\t\t\t\twriter.setAttribute( 'opCodeblockContent', update.content, modelElement );\n\t\t\t\t})\n\t\t\t);\n\n\t\t} );\n\n\t\t// Register toolbar button to create code block\n\t\teditor.ui.componentFactory.add( 'insertCodeBlock', locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: window.I18n.t('js.editor.macro.code_block.button'),\n\t\t\t\ticon: icon,\n\t\t\t\ttooltip: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\tpluginContext.services.macros\n\t\t\t\t\t.editCodeBlock()\n\t\t\t\t\t.then((update) => editor.model.change(writer => {\n\n\t\t\t\t\t\tconst element = writer.createElement( 'codeblock' );\n\t\t\t\t\t\twriter.setAttribute( 'opCodeblockLanguage', update.languageClass, element );\n\t\t\t\t\t\twriter.setAttribute( 'opCodeblockContent', update.content, element );\n\t\t\t\t\t\teditor.model.insertContent( element, editor.model.document.selection );\n\t\t\t\t\t})\n\t\t\t\t);\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n}\n","import ModelPosition from '@ckeditor/ckeditor5-engine/src/model/position';\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport ViewRange from '@ckeditor/ckeditor5-engine/src/view/range';\nimport {renderCodeBlockContent} from './widget';\n\n\nexport function modelCodeBlockToView() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'insert:codeblock', converter, { priority: 'high' } );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n\t\tconst codeBlock = data.item;\n\t\tconst language = codeBlock.getAttribute('opCodeblockLanguage') || 'language-text';\n\t\tconst content = codeBlock.getAttribute('opCodeblockContent');\n\n\t\t// Consume the codeblock and text\n\t\tconversionApi.consumable.consume( codeBlock, 'insert' );\n\n\t\t// Wrap the element in a <pre> <code> block\n\t\tconst viewWriter = conversionApi.writer;\n\t\tconst preElement = viewWriter.createContainerElement( 'pre' );\n\t\tconst langElement = viewWriter.createContainerElement( 'div', { class: 'op-ckeditor--code-block-language' } );\n\t\tconst codeElement = viewWriter.createContainerElement( 'code', { class: language } );\n\t\tconst langContent = viewWriter.createText( language );\n\t\tconst contentElement = viewWriter.createText( content );\n\n\t\tviewWriter.insert( ViewPosition.createAt( codeElement ), contentElement );\n\t\tviewWriter.insert( ViewPosition.createAt( langElement ), langContent );\n\t\tviewWriter.insert( ViewPosition.createAt( preElement ), langElement );\n\t\tviewWriter.insert( ViewPosition.createAt( preElement ), codeElement );\n\n\t\tconversionApi.mapper.bindElements( codeBlock, codeElement );\n\n\t\t// Insert at matching position\n\t\tconst insertPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\t\tviewWriter.insert( insertPosition, preElement );\n\n\t\tevt.stop();\n\t}\n}\n\nexport function viewCodeBlockToModel() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element:pre', converter, { priority: 'high' } );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n\t\t// Do not convert if this is not an \"image figure\".\n\t\tif ( !conversionApi.consumable.test( data.viewItem, { name: true } ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Find an code element inside the pre element.\n\t\tconst codeBlock = Array.from( data.viewItem.getChildren() ).find( viewChild => viewChild.is( 'code' ) );\n\n\t\t// Do not convert if code block is absent\n\t\tif ( !codeBlock || !conversionApi.consumable.consume( codeBlock, { name: true } ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Create the model element\n\t\tconst modelCodeBlock = conversionApi.writer.createElement( 'codeblock' );\n\t\tconversionApi.writer.setAttribute( 'opCodeblockLanguage', codeBlock.getAttribute('class'), modelCodeBlock );\n\n\t\t// Find allowed parent for paragraph that we are going to insert. If current parent does not allow\n\t\t// to insert paragraph but one of the ancestors does then split nodes to allowed parent.\n\t\tconst splitResult = conversionApi.splitToAllowedParent( modelCodeBlock, data.modelCursor );\n\n\t\t// When there is no split result it means that we can't insert paragraph in this position.\n\t\tif ( splitResult ) {\n\t\t\t// Insert codeblock in allowed position.\n\t\t\tconversionApi.writer.insert( modelCodeBlock, splitResult.position );\n\n\t\t\t// Convert text child of codeblock\n\t\t\t// const { modelRange } = conversionApi.convertChildren( codeBlock, ModelPosition.createAt( modelCodeBlock ) );\n\t\t\tconst child = codeBlock.getChild(0);\n\t\t\tconversionApi.consumable.consume( child, { name: true } );\n\t\t\tconst content = child.data;\n\t\t\tconversionApi.writer.setAttribute( 'opCodeblockContent', content, modelCodeBlock );\n\n\t\t\t// Set as conversion result, attribute converters may use this property.\n\t\t\tdata.modelRange = new ModelRange(\n\t\t\t\tModelPosition.createBefore( modelCodeBlock ),\n\t\t\t\tModelPosition.createAfter( modelCodeBlock )\n\t\t\t);\n\n\t\t\t// Convert after pre element\n\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t}\n\t}\n}\n\n\nexport function codeBlockContentToView() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'attribute:opCodeblockContent', converter );\n\t\tdispatcher.on( 'attribute:opCodeblockLanguage', converter );\n\t};\n\n\tfunction converter( evt, data, conversionApi ) {\n        const modelElement = data.item;\n\n        // Mark element as consumed by conversion.\n        conversionApi.consumable.consume( data.item, evt.name );\n\n        // Get mapped view element to update.\n        const viewElement = conversionApi.mapper.toViewElement( modelElement );\n\n        // Remove current <div> element contents.\n        conversionApi.writer.remove( ViewRange.createOn( viewElement.getChild( 1 ) ) );\n        conversionApi.writer.remove( ViewRange.createOn( viewElement.getChild( 0 ) ) );\n\n\t\t// Set current content\n\t\trenderCodeBlockContent( conversionApi.writer, modelElement, viewElement );\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\n\nimport {createToolbarEditButton} from '../../helpers/create-toolbar-edit-button';\nimport {createEditToolbar} from '../../helpers/create-toolbar';\nimport {isCodeBlockWidgetSelected} from './widget';\n\nexport default class CodeBlockToolbar extends Plugin {\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'CodeBlockToolbar';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = this.editor.model;\n\t\tconst pluginContext = editor.config.get('openProject.pluginContext');\n\n\t\t// Add editing button\n\t\tcreateToolbarEditButton( editor, 'opEditCodeBlock', widget => {\n\t\t\tconst macroService = pluginContext.services.macros;\n\t\t\tconst language = widget.getAttribute( 'opCodeblockLanguage' );\n\t\t\tconst content = widget.getAttribute( 'opCodeblockContent' );\n\n\t\t\tmacroService\n\t\t\t\t.editCodeBlock( content, language )\n\t\t\t\t.then((update) => model.change(writer => {\n\t\t\t\t\twriter.setAttribute( 'opCodeblockLanguage', update.languageClass, widget );\n\t\t\t\t\twriter.setAttribute( 'opCodeblockContent', update.content, widget );\n\t\t\t\t})\n\t\t\t);\n\t\t} );\n\t}\n\n\tafterInit() {\n\t\t// Add actual toolbar\n\t\tcreateEditToolbar(\n\t\t\tthis,\n\t\t\tthis.editor,\n\t\t\t'OPCodeBlock',\n\t\t\tisCodeBlockWidgetSelected\n\t\t);\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/dataprocessor/basichtmlwriter\n */\n\n/* globals document */\n\n/**\n * Basic HTML writer. It uses the native `innerHTML` property for basic conversion\n * from a document fragment to an HTML string.\n *\n * @implements module:engine/dataprocessor/htmlwriter~HtmlWriter\n */\nexport default class BasicHtmlWriter {\n\t/**\n\t * Returns an HTML string created from the document fragment.\n\t *\n\t * @param {DocumentFragment} fragment\n\t * @returns {String}\n\t */\n\tgetHtml( fragment ) {\n\t\tconst doc = document.implementation.createHTMLDocument( '' );\n\t\tconst container = doc.createElement( 'div' );\n\t\tcontainer.appendChild( fragment );\n\n\t\treturn container.innerHTML;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/node\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport clone from '@ckeditor/ckeditor5-utils/src/lib/lodash/clone';\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\n\n/**\n * Abstract tree view node class.\n *\n * @abstract\n */\nexport default class Node {\n\t/**\n\t * Creates a tree view node.\n\t *\n\t * This is an abstract class, so this constructor should not be used directly.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * Parent element. Null by default. Set by {@link module:engine/view/element~Element#_insertChild}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t\t */\n\t\tthis.parent = null;\n\t}\n\n\t/**\n\t * Index of the node in the parent element or null if the node has no parent.\n\t *\n\t * Accessing this property throws an error if this node's parent element does not contain it.\n\t * This means that view tree got broken.\n\t *\n\t * @readonly\n\t * @type {Number|null}\n\t */\n\tget index() {\n\t\tlet pos;\n\n\t\tif ( !this.parent ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// No parent or child doesn't exist in parent's children.\n\t\tif ( ( pos = this.parent.getChildIndex( this ) ) == -1 ) {\n\t\t\t/**\n\t\t\t * The node's parent does not contain this node. It means that the document tree is corrupted.\n\t\t\t *\n\t\t\t * @error view-node-not-found-in-parent\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-node-not-found-in-parent: The node\\'s parent does not contain this node.' );\n\t\t}\n\n\t\treturn pos;\n\t}\n\n\t/**\n\t * Node's next sibling, or `null` if it is the last child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nextSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index + 1 ) ) || null;\n\t}\n\n\t/**\n\t * Node's previous sibling, or `null` if it is the first child.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget previousSibling() {\n\t\tconst index = this.index;\n\n\t\treturn ( index !== null && this.parent.getChild( index - 1 ) ) || null;\n\t}\n\n\t/**\n\t * Top-most ancestor of the node. If the node has no parent it is the root itself.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\tlet root = this; // eslint-disable-line consistent-this\n\n\t\twhile ( root.parent ) {\n\t\t\troot = root.parent;\n\t\t}\n\n\t\treturn root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this node, or `null` if the node is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\t// Parent might be Node, null or DocumentFragment.\n\t\tif ( this.parent instanceof Node ) {\n\t\t\treturn this.parent.document;\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Gets a path to the node. The path is an array containing indices of consecutive ancestors of this node,\n\t * beginning from {@link module:engine/view/node~Node#root root}, down to this node's index.\n\t *\n\t *\t\tconst abc = new Text( 'abc' );\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst h1 = new Element( 'h1', null, new Text( 'header' ) );\n\t *\t\tconst p = new Element( 'p', null, [ abc, foo ] );\n\t *\t\tconst div = new Element( 'div', null, [ h1, p ] );\n\t *\t\tfoo.getPath(); // Returns [ 1, 3 ]. `foo` is in `p` which is in `div`. `p` starts at offset 1, while `foo` at 3.\n\t *\t\th1.getPath(); // Returns [ 0 ].\n\t *\t\tdiv.getPath(); // Returns [].\n\t *\n\t * @returns {Array.<Number>} The path.\n\t */\n\tgetPath() {\n\t\tconst path = [];\n\t\tlet node = this; // eslint-disable-line consistent-this\n\n\t\twhile ( node.parent ) {\n\t\t\tpath.unshift( node.index );\n\t\t\tnode = node.parent;\n\t\t}\n\n\t\treturn path;\n\t}\n\n\t/**\n\t * Returns ancestors array of this node.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` this node will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from node's parent to root element,\n\t * otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this : this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/element~Element} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both nodes.\n\t *\n\t * @param {module:engine/view/node~Node} node The second node.\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` both nodes will be considered \"ancestors\" too.\n\t * Which means that if e.g. node A is inside B, then their common ancestor will be B.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( node, options = {} ) {\n\t\tconst ancestorsA = this.getAncestors( options );\n\t\tconst ancestorsB = node.getAncestors( options );\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Returns whether this node is before given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisBefore( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst thisPath = this.getPath();\n\t\tconst nodePath = node.getPath();\n\n\t\tconst result = compareArrays( thisPath, nodePath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn true;\n\n\t\t\tcase 'extension':\n\t\t\t\treturn false;\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < nodePath[ result ];\n\t\t}\n\t}\n\n\t/**\n\t * Returns whether this node is after given node. `false` is returned if nodes are in different trees (for example,\n\t * in different {@link module:engine/view/documentfragment~DocumentFragment}s).\n\t *\n\t * @param {module:engine/view/node~Node} node Node to compare with.\n\t * @returns {Boolean}\n\t */\n\tisAfter( node ) {\n\t\t// Given node is not before this node if they are same.\n\t\tif ( this == node ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Return `false` if it is impossible to compare nodes.\n\t\tif ( this.root !== node.root ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// In other cases, just check if the `node` is before, and return the opposite.\n\t\treturn !this.isBefore( node );\n\t}\n\n\t/**\n\t * Removes node from parent.\n\t *\n\t * @protected\n\t */\n\t_remove() {\n\t\tthis.parent._removeChildren( this.index );\n\t}\n\n\t/**\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\n\t\tif ( this.parent ) {\n\t\t\tthis.parent._fireChange( type, node );\n\t\t}\n\t}\n\n\t/**\n\t * Custom toJSON method to solve child-parent circular dependencies.\n\t *\n\t * @returns {Object} Clone of this object with the parent property removed.\n\t */\n\ttoJSON() {\n\t\tconst json = clone( this );\n\n\t\t// Due to circular references we need to remove parent reference.\n\t\tdelete json.parent;\n\n\t\treturn json;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * This method is useful when processing view tree objects that are of unknown type. For example, a function\n\t * may return {@link module:engine/view/documentfragment~DocumentFragment} or {@link module:engine/view/node~Node}\n\t * that can be either text node or element. This method can be used to check what kind of object is returned.\n\t *\n\t *\t\tobj.is( 'node' ); // true for any node, false for document fragment and text fragment\n\t *\t\tobj.is( 'documentFragment' ); // true for document fragment, false for any node\n\t *\t\tobj.is( 'element' ); // true for any element, false for text node or document fragment\n\t *\t\tobj.is( 'element', 'p' ); // true only for element which name is 'p'\n\t *\t\tobj.is( 'p' ); // shortcut for obj.is( 'element', 'p' )\n\t *\t\tobj.is( 'text' ); // true for text node, false for element and document fragment\n\t *\n\t * @method #is\n\t * @param {'element'|'containerElement'|'attributeElement'|'emptyElement'|'uiElement'|\n\t * 'rootElement'|'documentFragment'|'text'|'textProxy'} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'node';\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @method #_clone\n\t * @returns {module:engine/view/node~Node} Clone of this node.\n\t */\n\n\t/**\n\t * Checks if provided node is similar to this node.\n\t *\n\t * @method #isSimilar\n\t * @returns {Boolean} True if nodes are similar.\n\t */\n}\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} children changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:children\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when list of {@link module:engine/view/element~Element elements} attributes changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:attributes\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * Fired when {@link module:engine/view/text~Text text nodes} data changes.\n *\n * Change event is bubbled – it is fired on all ancestors.\n *\n * @event change:text\n * @param {module:engine/view/node~Node} changedNode\n */\n\n/**\n * @event change\n */\n\nmix( Node, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/text\n */\n\nimport Node from './node';\n\n/**\n * Tree view text node.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Text extends Node {\n\t/**\n\t * Creates a tree view text node.\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code.\n\t * Use the {@link module:engine/view/writer~Writer#createText} method instead.\n\t *\n\t * @protected\n\t * @param {String} data Text.\n\t */\n\tconstructor( data ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * The text content.\n\t\t *\n\t\t * Setting the data fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t\t *\n\t\t * @protected\n\t\t * @member {String} module:engine/view/text~Text#_textData\n\t\t */\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type ) {\n\t\treturn type == 'text' || super.is( type );\n\t}\n\n\t/**\n\t * The text content.\n\t *\n\t * @returns {String}\n\t */\n\tget data() {\n\t\treturn this._textData;\n\t}\n\n\t/**\n\t * This getter is required when using the addition assignment operator on protected property:\n\t *\n\t *\t\tconst foo = new Text( 'foo' );\n\t *\t\tconst bar = new Text( 'bar' );\n\t *\n\t *\t\tfoo._data += bar.data;   // executes: `foo._data = foo._data + bar.data`\n\t *\t\tconsole.log( foo.data ); // prints: 'foobar'\n\t *\n\t * If the protected getter didn't exist, `foo._data` will return `undefined` and result of the merge will be invalid.\n\t *\n\t * @protected\n\t * @returns {String}\n\t */\n\tget _data() {\n\t\treturn this.data;\n\t}\n\n\t/**\n\t * Sets data and fires the {@link module:engine/view/node~Node#event:change:text change event}.\n\t *\n\t * @protected\n\t * @fires change:text\n\t * @param {String} data New data for the text node.\n\t */\n\tset _data( data ) {\n\t\tthis._fireChange( 'text', this );\n\n\t\tthis._textData = data;\n\t}\n\n\t/**\n\t * Checks if this text node is similar to other text node.\n\t * Both nodes should have the same data to be considered as similar.\n\t *\n\t * @param {module:engine/view/text~Text} otherNode Node to check if it is same as this node.\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherNode ) {\n\t\tif ( !( otherNode instanceof Text ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn this === otherNode || this.data === otherNode.data;\n\t}\n\n\t/**\n\t * Clones this node.\n\t *\n\t * @protected\n\t * @returns {module:engine/view/text~Text} Text node that is a clone of this node.\n\t */\n\t_clone() {\n\t\treturn new Text( this.data );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/textproxy\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * TextProxy is a wrapper for substring of {@link module:engine/view/text~Text}. Instance of this class is created by\n * {@link module:engine/view/treewalker~TreeWalker} when only a part of {@link module:engine/view/text~Text} needs to be returned.\n *\n * `TextProxy` has an API similar to {@link module:engine/view/text~Text Text} and allows to do most of the common tasks performed\n * on view nodes.\n *\n * **Note:** Some `TextProxy` instances may represent whole text node, not just a part of it.\n * See {@link module:engine/view/textproxy~TextProxy#isPartial}.\n *\n * **Note:** `TextProxy` is a readonly interface.\n *\n * **Note:** `TextProxy` instances are created on the fly basing on the current state of parent {@link module:engine/view/text~Text}.\n * Because of this it is highly unrecommended to store references to `TextProxy instances because they might get\n * invalidated due to operations on Document. Also TextProxy is not a {@link module:engine/view/node~Node} so it can not be\n * inserted as a child of {@link module:engine/view/element~Element}.\n *\n * `TextProxy` instances are created by {@link module:engine/view/treewalker~TreeWalker view tree walker}. You should not need to create\n * an instance of this class by your own.\n */\nexport default class TextProxy {\n\t/**\n\t * Creates a text proxy.\n\t *\n\t * @protected\n\t * @param {module:engine/view/text~Text} textNode Text node which part is represented by this text proxy.\n\t * @param {Number} offsetInText Offset in {@link module:engine/view/textproxy~TextProxy#textNode text node}\n\t * from which the text proxy starts.\n\t * @param {Number} length Text proxy length, that is how many text node's characters, starting from `offsetInText` it represents.\n\t * @constructor\n\t */\n\tconstructor( textNode, offsetInText, length ) {\n\t\t/**\n\t\t * Reference to the {@link module:engine/view/text~Text} element which TextProxy is a substring.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/text~Text} module:engine/view/textproxy~TextProxy#textNode\n\t\t */\n\t\tthis.textNode = textNode;\n\n\t\tif ( offsetInText < 0 || offsetInText > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given offsetInText value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-offsetintext\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-offsetintext: Given offsetInText value is incorrect.' );\n\t\t}\n\n\t\tif ( length < 0 || offsetInText + length > textNode.data.length ) {\n\t\t\t/**\n\t\t\t * Given length value is incorrect.\n\t\t\t *\n\t\t\t * @error view-textproxy-wrong-length\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-textproxy-wrong-length: Given length value is incorrect.' );\n\t\t}\n\n\t\t/**\n\t\t * Text data represented by this text proxy.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:engine/view/textproxy~TextProxy#data\n\t\t */\n\t\tthis.data = textNode.data.substring( offsetInText, offsetInText + length );\n\n\t\t/**\n\t\t * Offset in the `textNode` where this `TextProxy` instance starts.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/textproxy~TextProxy#offsetInText\n\t\t */\n\t\tthis.offsetInText = offsetInText;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tget offsetSize() {\n\t\treturn this.data.length;\n\t}\n\n\t/**\n\t * Flag indicating whether `TextProxy` instance covers only part of the original {@link module:engine/view/text~Text text node}\n\t * (`true`) or the whole text node (`false`).\n\t *\n\t * This is `false` when text proxy starts at the very beginning of {@link module:engine/view/textproxy~TextProxy#textNode textNode}\n\t * ({@link module:engine/view/textproxy~TextProxy#offsetInText offsetInText} equals `0`) and text proxy sizes is equal to\n\t * text node size.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isPartial() {\n\t\treturn this.data.length !== this.textNode.data.length;\n\t}\n\n\t/**\n\t * Parent of this text proxy, which is same as parent of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tget parent() {\n\t\treturn this.textNode.parent;\n\t}\n\n\t/**\n\t * Root of this text proxy, which is same as root of text node represented by this text proxy.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.textNode.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/document~Document View document} that owns this text proxy, or `null` if the text proxy is inside\n\t * {@link module:engine/view/documentfragment~DocumentFragment document fragment}.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/document~Document|null}\n\t */\n\tget document() {\n\t\treturn this.textNode.document;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'textProxy';\n\t}\n\n\t/**\n\t * Returns ancestors array of this text proxy.\n\t *\n\t * @param {Object} options Options object.\n\t * @param {Boolean} [options.includeSelf=false] When set to `true` {#textNode} will be also included in parent's array.\n\t * @param {Boolean} [options.parentFirst=false] When set to `true`, array will be sorted from text proxy parent to\n\t * root element, otherwise root element will be the first item in the array.\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors( options = { includeSelf: false, parentFirst: false } ) {\n\t\tconst ancestors = [];\n\t\tlet parent = options.includeSelf ? this.textNode : this.parent;\n\n\t\twhile ( parent !== null ) {\n\t\t\tancestors[ options.parentFirst ? 'push' : 'unshift' ]( parent );\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn ancestors;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/matcher\n */\n\n/**\n * View matcher class.\n * Instance of this class can be used to find {@link module:engine/view/element~Element elements} that match given pattern.\n */\nexport default class Matcher {\n\t/**\n\t * Creates new instance of Matcher.\n\t *\n\t * @param {String|RegExp|Object} [pattern] Match patterns. See {@link module:engine/view/matcher~Matcher#add add method} for\n\t * more information.\n\t */\n\tconstructor( ...pattern ) {\n\t\t/**\n\t\t * @private\n\t\t * @type {Array<String|RegExp|Object>}\n\t\t */\n\t\tthis._patterns = [];\n\n\t\tthis.add( ...pattern );\n\t}\n\n\t/**\n\t * Adds pattern or patterns to matcher instance.\n\t *\n\t *\t\t// String.\n\t *\t\tmatcher.add( 'div' );\n\t *\n\t *\t\t// Regular expression.\n\t *\t\tmatcher.add( /^\\w/ );\n\t *\n\t *\t\t// Single class.\n\t *\t\tmatcher.add( {\n\t *\t\t\tclasses: 'foobar'\n\t *\t\t} );\n\t *\n\t * See {@link module:engine/view/matcher~MatcherPattern} for more examples.\n\t *\n\t * Multiple patterns can be added in one call:\n\t *\n\t * \t\tmatcher.add( 'div', { classes: 'foobar' } );\n\t *\n\t * @param {Object|String|RegExp|Function} pattern Object describing pattern details. If string or regular expression\n\t * is provided it will be used to match element's name. Pattern can be also provided in a form\n\t * of a function - then this function will be called with each {@link module:engine/view/element~Element element} as a parameter.\n\t * Function's return value will be stored under `match` key of the object returned from\n\t * {@link module:engine/view/matcher~Matcher#match match} or {@link module:engine/view/matcher~Matcher#matchAll matchAll} methods.\n\t * @param {String|RegExp} [pattern.name] Name or regular expression to match element's name.\n\t * @param {Object} [pattern.attributes] Object with key-value pairs representing attributes to match. Each object key\n\t * represents attribute name. Value under that key can be either:\n\t * * `true` - then attribute is just required (can be empty),\n\t * * a string - then attribute has to be equal, or\n\t * * a regular expression - then attribute has to match the expression.\n\t * @param {String|RegExp|Array} [pattern.classes] Class name or array of class names to match. Each name can be\n\t * provided in a form of string or regular expression.\n\t * @param {Object} [pattern.styles] Object with key-value pairs representing styles to match. Each object key\n\t * represents style name. Value under that key can be either a string or a regular expression and it will be used\n\t * to match style value.\n\t */\n\tadd( ...pattern ) {\n\t\tfor ( let item of pattern ) {\n\t\t\t// String or RegExp pattern is used as element's name.\n\t\t\tif ( typeof item == 'string' || item instanceof RegExp ) {\n\t\t\t\titem = { name: item };\n\t\t\t}\n\n\t\t\t// Single class name/RegExp can be provided.\n\t\t\tif ( item.classes && ( typeof item.classes == 'string' || item.classes instanceof RegExp ) ) {\n\t\t\t\titem.classes = [ item.classes ];\n\t\t\t}\n\n\t\t\tthis._patterns.push( item );\n\t\t}\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns match information about first found\n\t * {@link module:engine/view/element~Element element}, otherwise returns `null`.\n\t *\n\t * Example of returned object:\n\t *\n\t *\t\t{\n\t *\t\t\telement: <instance of found element>,\n\t *\t\t\tpattern: <pattern used to match found element>,\n\t *\t\t\tmatch: {\n\t *\t\t\t\tname: true,\n\t *\t\t\t\tattributes: [ 'title', 'href' ],\n\t *\t\t\t\tclasses: [ 'foo' ],\n\t *\t\t\t\tstyles: [ 'color', 'position' ]\n\t *\t\t\t}\n\t *\t\t}\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#matchAll\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Object|null} result\n\t * @returns {module:engine/view/element~Element} result.element Matched view element.\n\t * @returns {Object|String|RegExp|Function} result.pattern Pattern that was used to find matched element.\n\t * @returns {Object} result.match Object representing matched element parts.\n\t * @returns {Boolean} [result.match.name] True if name of the element was matched.\n\t * @returns {Array} [result.match.attributes] Array with matched attribute names.\n\t * @returns {Array} [result.match.classes] Array with matched class names.\n\t * @returns {Array} [result.match.styles] Array with matched style names.\n\t */\n\tmatch( ...element ) {\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\treturn {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t};\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Matches elements for currently stored patterns. Returns array of match information with all found\n\t * {@link module:engine/view/element~Element elements}. If no element is found - returns `null`.\n\t *\n\t * @see module:engine/view/matcher~Matcher#add\n\t * @see module:engine/view/matcher~Matcher#match\n\t * @param {...module:engine/view/element~Element} element View element to match against stored patterns.\n\t * @returns {Array.<Object>|null} Array with match information about found elements or `null`. For more information\n\t * see {@link module:engine/view/matcher~Matcher#match match method} description.\n\t */\n\tmatchAll( ...element ) {\n\t\tconst results = [];\n\n\t\tfor ( const singleElement of element ) {\n\t\t\tfor ( const pattern of this._patterns ) {\n\t\t\t\tconst match = isElementMatching( singleElement, pattern );\n\n\t\t\t\tif ( match ) {\n\t\t\t\t\tresults.push( {\n\t\t\t\t\t\telement: singleElement,\n\t\t\t\t\t\tpattern,\n\t\t\t\t\t\tmatch\n\t\t\t\t\t} );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn results.length > 0 ? results : null;\n\t}\n\n\t/**\n\t * Returns the name of the element to match if there is exactly one pattern added to the matcher instance\n\t * and it matches element name defined by `string` (not `RegExp`). Otherwise, returns `null`.\n\t *\n\t * @returns {String|null} Element name trying to match.\n\t */\n\tgetElementName() {\n\t\tif ( this._patterns.length !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst pattern = this._patterns[ 0 ];\n\t\tconst name = pattern.name;\n\n\t\treturn ( typeof pattern != 'function' && name && !( name instanceof RegExp ) ) ? name : null;\n\t}\n}\n\n// Returns match information if {@link module:engine/view/element~Element element} is matching provided pattern.\n// If element cannot be matched to provided pattern - returns `null`.\n//\n// @param {module:engine/view/element~Element} element\n// @param {Object|String|RegExp|Function} pattern\n// @returns {Object|null} Returns object with match information or null if element is not matching.\nfunction isElementMatching( element, pattern ) {\n\t// If pattern is provided as function - return result of that function;\n\tif ( typeof pattern == 'function' ) {\n\t\treturn pattern( element );\n\t}\n\n\tconst match = {};\n\t// Check element's name.\n\tif ( pattern.name ) {\n\t\tmatch.name = matchName( pattern.name, element.name );\n\n\t\tif ( !match.name ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's attributes.\n\tif ( pattern.attributes ) {\n\t\tmatch.attributes = matchAttributes( pattern.attributes, element );\n\n\t\tif ( !match.attributes ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// Check element's classes.\n\tif ( pattern.classes ) {\n\t\tmatch.classes = matchClasses( pattern.classes, element );\n\n\t\tif ( !match.classes ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\t// Check element's styles.\n\tif ( pattern.styles ) {\n\t\tmatch.styles = matchStyles( pattern.styles, element );\n\n\t\tif ( !match.styles ) {\n\t\t\treturn false;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if name can be matched by provided pattern.\n//\n// @param {String|RegExp} pattern\n// @param {String} name\n// @returns {Boolean} Returns `true` if name can be matched, `false` otherwise.\nfunction matchName( pattern, name ) {\n\t// If pattern is provided as RegExp - test against this regexp.\n\tif ( pattern instanceof RegExp ) {\n\t\treturn pattern.test( name );\n\t}\n\n\treturn pattern === name;\n}\n\n// Checks if attributes of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about attributes to match. Each key of the object will be\n// used as attribute name. Value of each key can be a string or regular expression to match against attribute value.\n// @param {module:engine/view/element~Element} element Element which attributes will be tested.\n// @returns {Array|null} Returns array with matched attribute names or `null` if no attributes were matched.\nfunction matchAttributes( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasAttribute( name ) ) {\n\t\t\tconst attribute = element.getAttribute( name );\n\n\t\t\tif ( pattern === true ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else if ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( attribute ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( attribute === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if classes of provided element can be matched against provided patterns.\n//\n// @param {Array.<String|RegExp>} patterns Array of strings or regular expressions to match against element's classes.\n// @param {module:engine/view/element~Element} element Element which classes will be tested.\n// @returns {Array|null} Returns array with matched class names or `null` if no classes were matched.\nfunction matchClasses( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const pattern of patterns ) {\n\t\tif ( pattern instanceof RegExp ) {\n\t\t\tconst classes = element.getClassNames();\n\n\t\t\tfor ( const name of classes ) {\n\t\t\t\tif ( pattern.test( name ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( match.length === 0 ) {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else if ( element.hasClass( pattern ) ) {\n\t\t\tmatch.push( pattern );\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n// Checks if styles of provided element can be matched against provided patterns.\n//\n// @param {Object} patterns Object with information about styles to match. Each key of the object will be\n// used as style name. Value of each key can be a string or regular expression to match against style value.\n// @param {module:engine/view/element~Element} element Element which styles will be tested.\n// @returns {Array|null} Returns array with matched style names or `null` if no styles were matched.\nfunction matchStyles( patterns, element ) {\n\tconst match = [];\n\n\tfor ( const name in patterns ) {\n\t\tconst pattern = patterns[ name ];\n\n\t\tif ( element.hasStyle( name ) ) {\n\t\t\tconst style = element.getStyle( name );\n\n\t\t\tif ( pattern instanceof RegExp ) {\n\t\t\t\tif ( pattern.test( style ) ) {\n\t\t\t\t\tmatch.push( name );\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t} else if ( style === pattern ) {\n\t\t\t\tmatch.push( name );\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t} else {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\treturn match;\n}\n\n/**\n * An entity that is a valid pattern recognized by a matcher. `MatcherPattern` is used by {@link ~Matcher} to recognize\n * if a view element fits in a group of view elements described by the pattern.\n *\n * `MatcherPattern` can be given as a `String`, a `RegExp`, an `Object` or a `Function`.\n *\n * If `MatcherPattern` is given as a `String` or `RegExp`, it will match any view element that has a matching name:\n *\n *\t\t// Match any element with name equal to 'div'.\n *\t\tconst pattern = 'div';\n *\n *\t\t// Match any element which name starts on 'p'.\n *\t\tconst pattern = /^p/;\n *\n * If `MatcherPattern` is given as an `Object`, all the object's properties will be matched with view element properties.\n *\n *\t\t// Match view element's name.\n *\t\tconst pattern = { name: /^p/ };\n *\n *\t\t// Match view element which has matching attributes.\n *\t\tconst pattern = {\n *\t\t\tattribute: {\n *\t\t\t\ttitle: 'foobar',\t// Attribute title should equal 'foobar'.\n *\t\t\t\tfoo: /^\\w+/,\t\t// Attribute foo should match /^\\w+/ regexp.\n *\t\t\t\tbar: true\t\t\t// Attribute bar should be set (can be empty).\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Match view element which has given class.\n *\t\tconst pattern = {\n *\t\t\tclasses: 'foobar'\n *\t\t};\n *\n *\t\t// Match view element class using regular expression.\n *\t\tconst pattern = {\n *\t\t\tclasses: /foo.../\n *\t\t};\n *\n *\t\t// Multiple classes to match.\n *\t\tconst pattern = {\n *\t\t\tclasses: [ 'baz', 'bar', /foo.../ ]\n *\t\t}:\n *\n *\t\t// Match view element which has given styles.\n *\t\tconst pattern = {\n *\t\t\tstyles: {\n *\t\t\t\tposition: 'absolute',\n *\t\t\t\tcolor: /^\\w*blue$/\n *\t\t\t}\n *\t\t};\n *\n *\t\t// Pattern with multiple properties.\n *\t\tconst pattern = {\n *\t\t\tname: 'span',\n *\t\t\tstyles: {\n *\t\t\t\t'font-weight': 'bold'\n *\t\t\t},\n *\t\t\tclasses: 'highlighted'\n *\t\t};\n *\n * If `MatcherPattern` is given as a `Function`, the function takes a view element as a first and only parameter and\n * the function should decide whether that element matches. If so, it should return what part of the view element has been matched.\n * Otherwise, the function should return `null`. The returned result will be included in `match` property of the object\n * returned by {@link ~Matcher#match} call.\n *\n *\t\t// Match an empty <div> element.\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'div' && element.childCount > 0 ) {\n *\t\t\t\t// Return which part of the element was matched.\n *\t\t\t\treturn { name: true };\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n *\t\t// Match a <p> element with big font (\"heading-like\" element).\n *\t\tconst pattern = element => {\n *\t\t\tif ( element.name == 'p' ) {\n *\t\t\t\tconst fontSize = element.getStyle( 'font-size' );\n *\t\t\t\tconst size = fontSize.match( /(\\d+)/px );\n *\n *\t\t\t\tif ( size && Number( size[ 1 ] ) > 26 ) {\n *\t\t\t\t\treturn { name: true, attribute: [ 'font-size' ] };\n *\t\t\t\t}\n *\t\t\t}\n *\n *\t\t\treturn null;\n *\t\t};\n *\n * `MatcherPattern` is defined in a way that it is a superset of {@link module:engine/view/elementdefinition~ElementDefinition},\n * that is, every `ElementDefinition` also can be used as a `MatcherPattern`.\n *\n * @typedef {String|RegExp|Object|Function} module:engine/view/matcher~MatcherPattern\n *\n * @property {String|RegExp} [name] View element name to match.\n * @property {String|RegExp|Array.<String|RegExp>} [classes] View element's class name(s) to match.\n * @property {Object} [styles] Object with key-value pairs representing styles to match.\n * Each object key represents style name. Value can be given as `String` or `RegExp`.\n * @property {Object} [attributes] Object with key-value pairs representing attributes to match.\n * Each object key represents attribute name. Value can be given as `String` or `RegExp`.\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/element\n */\n\nimport Node from './node';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport objectToMap from '@ckeditor/ckeditor5-utils/src/objecttomap';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport isPlainObject from '@ckeditor/ckeditor5-utils/src/lib/lodash/isPlainObject';\nimport Matcher from './matcher';\n\n/**\n * View element.\n *\n * The editing engine does not define a fixed semantics of its elements (it is \"DTD-free\").\n * This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer. When creating an element you should use one of the following methods:\n *\n * * {@link module:engine/view/writer~Writer#createContainerElement `writer.createContainerElement()`} in order to create\n * a {@link module:engine/view/containerelement~ContainerElement},\n * * {@link module:engine/view/writer~Writer#createAttributeElement `writer.createAttributeElement()`} in order to create\n * a {@link module:engine/view/attributeelement~AttributeElement},\n * * {@link module:engine/view/writer~Writer#createEmptyElement `writer.createEmptyElement()`} in order to create\n * a {@link module:engine/view/emptyelement~EmptyElement}.\n * * {@link module:engine/view/writer~Writer#createUIElement `writer.createUIElement()`} in order to create\n * a {@link module:engine/view/uielement~UIElement}.\n * * {@link module:engine/view/writer~Writer#createEditableElement `writer.createEditableElement()`} in order to create\n * a {@link module:engine/view/editableelement~EditableElement}.\n *\n * Note that for view elements which are not created from the model, like elements from mutations, paste or\n * {@link module:engine/controller/datacontroller~DataController#set data.set} it is not possible to define the type of the element, so\n * these will be instances of the {@link module:engine/view/element~Element}.\n *\n * @extends module:engine/view/node~Node\n */\nexport default class Element extends Node {\n\t/**\n\t * Creates a view element.\n\t *\n\t * Attributes can be passed in various formats:\n\t *\n\t *\t\tnew Element( 'div', { 'class': 'editor', 'contentEditable': 'true' } ); // object\n\t *\t\tnew Element( 'div', [ [ 'class', 'editor' ], [ 'contentEditable', 'true' ] ] ); // map-like iterator\n\t *\t\tnew Element( 'div', mapOfAttributes ); // map\n\t *\n\t * **Note:** Constructor of this class shouldn't be used directly in the code. Use the\n\t * {@link module:engine/view/writer~Writer#createAttributeElement} for inline element,\n\t * {@link module:engine/view/writer~Writer#createContainerElement} for block element,\n\t * {@link module:engine/view/writer~Writer#createEditableElement} for editable element,\n\t * {@link module:engine/view/writer~Writer#createEmptyElement} for empty element or\n\t * {@link module:engine/view/writer~Writer#createUIElement} for UI element instead.\n\t *\n\t * @protected\n\t * @param {String} name Node name.\n\t * @param {Object|Iterable} [attrs] Collection of attributes.\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children]\n\t * List of nodes to be inserted into created element.\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper();\n\n\t\t/**\n\t\t * Name of the element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String}\n\t\t */\n\t\tthis.name = name;\n\n\t\t/**\n\t\t * Map of attributes, where attributes names are keys and attributes values are values.\n\t\t *\n\t\t * @protected\n\t\t * @member {Map} #_attrs\n\t\t */\n\t\tthis._attrs = parseAttributes( attrs );\n\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/node~Node>}\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\n\t\t/**\n\t\t * Set of classes associated with element instance.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set}\n\t\t */\n\t\tthis._classes = new Set();\n\n\t\tif ( this._attrs.has( 'class' ) ) {\n\t\t\t// Remove class attribute and handle it by class set.\n\t\t\tconst classString = this._attrs.get( 'class' );\n\t\t\tparseClasses( this._classes, classString );\n\t\t\tthis._attrs.delete( 'class' );\n\t\t}\n\n\t\t/**\n\t\t * Map of styles.\n\t\t *\n\t\t * @protected\n\t\t * @member {Set} module:engine/view/element~Element#_styles\n\t\t */\n\t\tthis._styles = new Map();\n\n\t\tif ( this._attrs.has( 'style' ) ) {\n\t\t\t// Remove style attribute and handle it by styles map.\n\t\t\tparseInlineStyles( this._styles, this._attrs.get( 'style' ) );\n\t\t\tthis._attrs.delete( 'style' );\n\t\t}\n\n\t\t/**\n\t\t * Map of custom properties.\n\t\t * Custom properties can be added to element instance, will be cloned but not rendered into DOM.\n\t\t *\n\t\t * @protected\n\t\t * @memeber {Map}\n\t\t */\n\t\tthis._customProperties = new Map();\n\t}\n\n\t/**\n\t * Number of element's children.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this element, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this._children.length === 0;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @param {String} [name] Element name.\n\t * @returns {Boolean}\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'element' || type == this.name || super.is( type );\n\t\t} else {\n\t\t\treturn type == 'element' && name == this.name;\n\t\t}\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Returns an iterator that contains the keys for attributes. Order of inserting attributes is not preserved.\n\t *\n\t * @returns {Iterable.<String>} Keys for attributes.\n\t */\n\t* getAttributeKeys() {\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield 'class';\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield 'style';\n\t\t}\n\n\t\t// This is not an optimal solution because of https://github.com/ckeditor/ckeditor5-engine/issues/454.\n\t\t// It can be simplified to `yield* this._attrs.keys();`.\n\t\tfor ( const key of this._attrs.keys() ) {\n\t\t\tyield key;\n\t\t}\n\t}\n\n\t/**\n\t * Returns iterator that iterates over this element's attributes.\n\t *\n\t * Attributes are returned as arrays containing two items. First one is attribute key and second is attribute value.\n\t * This format is accepted by native `Map` object and also can be passed in `Node` constructor.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getAttributes() {\n\t\tyield* this._attrs.entries();\n\n\t\tif ( this._classes.size > 0 ) {\n\t\t\tyield [ 'class', this.getAttribute( 'class' ) ];\n\t\t}\n\n\t\tif ( this._styles.size > 0 ) {\n\t\t\tyield [ 'style', this.getAttribute( 'style' ) ];\n\t\t}\n\t}\n\n\t/**\n\t * Gets attribute by key. If attribute is not present - returns undefined.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {String|undefined} Attribute value.\n\t */\n\tgetAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\treturn [ ...this._classes ].join( ' ' );\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tlet styleString = '';\n\n\t\t\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\t\t\tstyleString += `${ property }:${ value };`;\n\t\t\t\t}\n\n\t\t\t\treturn styleString;\n\t\t\t}\n\n\t\t\treturn undefined;\n\t\t}\n\n\t\treturn this._attrs.get( key );\n\t}\n\n\t/**\n\t * Returns a boolean indicating whether an attribute with the specified key exists in the element.\n\t *\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} `true` if attribute with the specified key exists in the element, false otherwise.\n\t */\n\thasAttribute( key ) {\n\t\tif ( key == 'class' ) {\n\t\t\treturn this._classes.size > 0;\n\t\t}\n\n\t\tif ( key == 'style' ) {\n\t\t\treturn this._styles.size > 0;\n\t\t}\n\n\t\treturn this._attrs.has( key );\n\t}\n\n\t/**\n\t * Checks if this element is similar to other element.\n\t * Both elements should have the same name and attributes to be considered as similar. Two similar elements\n\t * can contain different set of children nodes.\n\t *\n\t * @param {module:engine/view/element~Element} otherElement\n\t * @returns {Boolean}\n\t */\n\tisSimilar( otherElement ) {\n\t\tif ( !( otherElement instanceof Element ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If exactly the same Element is provided - return true immediately.\n\t\tif ( this === otherElement ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check element name.\n\t\tif ( this.name != otherElement.name ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check number of attributes, classes and styles.\n\t\tif ( this._attrs.size !== otherElement._attrs.size || this._classes.size !== otherElement._classes.size ||\n\t\t\tthis._styles.size !== otherElement._styles.size ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Check if attributes are the same.\n\t\tfor ( const [ key, value ] of this._attrs ) {\n\t\t\tif ( !otherElement._attrs.has( key ) || otherElement._attrs.get( key ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if classes are the same.\n\t\tfor ( const className of this._classes ) {\n\t\t\tif ( !otherElement._classes.has( className ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// Check if styles are the same.\n\t\tfor ( const [ property, value ] of this._styles ) {\n\t\t\tif ( !otherElement._styles.has( property ) || otherElement._styles.get( property ) !== value ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns true if class is present.\n\t * If more then one class is provided - returns true only when all classes are present.\n\t *\n\t *\t\telement.hasClass( 'foo' ); // Returns true if 'foo' class is present.\n\t *\t\telement.hasClass( 'foo', 'bar' ); // Returns true if 'foo' and 'bar' classes are both present.\n\t *\n\t * @param {...String} className\n\t */\n\thasClass( ...className ) {\n\t\tfor ( const name of className ) {\n\t\t\tif ( !this._classes.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns iterator that contains all class names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetClassNames() {\n\t\treturn this._classes.keys();\n\t}\n\n\t/**\n\t * Returns style value for given property.\n\t * Undefined is returned if style does not exist.\n\t *\n\t * @param {String} property\n\t * @returns {String|undefined}\n\t */\n\tgetStyle( property ) {\n\t\treturn this._styles.get( property );\n\t}\n\n\t/**\n\t * Returns iterator that contains all style names.\n\t *\n\t * @returns {Iterable.<String>}\n\t */\n\tgetStyleNames() {\n\t\treturn this._styles.keys();\n\t}\n\n\t/**\n\t * Returns true if style keys are present.\n\t * If more then one style property is provided - returns true only when all properties are present.\n\t *\n\t *\t\telement.hasStyle( 'color' ); // Returns true if 'border-top' style is present.\n\t *\t\telement.hasStyle( 'color', 'border-top' ); // Returns true if 'color' and 'border-top' styles are both present.\n\t *\n\t * @param {...String} property\n\t */\n\thasStyle( ...property ) {\n\t\tfor ( const name of property ) {\n\t\t\tif ( !this._styles.has( name ) ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns ancestor element that match specified pattern.\n\t * Provided patterns should be compatible with {@link module:engine/view/matcher~Matcher Matcher} as it is used internally.\n\t *\n\t * @see module:engine/view/matcher~Matcher\n\t * @param {Object|String|RegExp|Function} patterns Patterns used to match correct ancestor.\n\t * See {@link module:engine/view/matcher~Matcher}.\n\t * @returns {module:engine/view/element~Element|null} Found element or `null` if no matching ancestor was found.\n\t */\n\tfindAncestor( ...patterns ) {\n\t\tconst matcher = new Matcher( ...patterns );\n\t\tlet parent = this.parent;\n\n\t\twhile ( parent ) {\n\t\t\tif ( matcher.match( parent ) ) {\n\t\t\t\treturn parent;\n\t\t\t}\n\n\t\t\tparent = parent.parent;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns the custom property value for the given key.\n\t *\n\t * @param {String|Symbol} key\n\t * @returns {*}\n\t */\n\tgetCustomProperty( key ) {\n\t\treturn this._customProperties.get( key );\n\t}\n\n\t/**\n\t * Returns an iterator which iterates over this element's custom properties.\n\t * Iterator provides `[ key, value ]` pairs for each stored property.\n\t *\n\t * @returns {Iterable.<*>}\n\t */\n\t* getCustomProperties() {\n\t\tyield* this._customProperties.entries();\n\t}\n\n\t/**\n\t * Returns identity string based on element's name, styles, classes and other attributes.\n\t * Two elements that {@link #isSimilar are similar} will have same identity string.\n\t * It has the following format:\n\t *\n\t *\t\t'name class=\"class1,class2\" style=\"style1:value1;style2:value2\" attr1=\"val1\" attr2=\"val2\"'\n \t *\n\t * For example:\n\t *\n\t *\t\tconst element = writer.createContainerElement( 'foo', {\n\t *\t\t\tbanana: '10',\n\t *\t\t\tapple: '20',\n\t *\t\t\tstyle: 'color: red; border-color: white;',\n\t *\t\t\tclass: 'baz'\n\t *\t\t} );\n\t *\n\t *\t\t// returns 'foo class=\"baz\" style=\"border-color:white;color:red\" apple=\"20\" banana=\"10\"'\n\t *\t\telement.getIdentity();\n\t *\n\t * NOTE: Classes, styles and other attributes are sorted alphabetically.\n\t *\n\t * @returns {String}\n\t */\n\tgetIdentity() {\n\t\tconst classes = Array.from( this._classes ).sort().join( ',' );\n\t\tconst styles = Array.from( this._styles ).map( i => `${ i[ 0 ] }:${ i[ 1 ] }` ).sort().join( ';' );\n\t\tconst attributes = Array.from( this._attrs ).map( i => `${ i[ 0 ] }=\"${ i[ 1 ] }\"` ).sort().join( ' ' );\n\n\t\treturn this.name +\n\t\t\t( classes == '' ? '' : ` class=\"${ classes }\"` ) +\n\t\t\t( styles == '' ? '' : ` style=\"${ styles }\"` ) +\n\t\t\t( attributes == '' ? '' : ` ${ attributes }` );\n\t}\n\n\t/**\n\t * Clones provided element.\n\t *\n\t * @protected\n\t * @param {Boolean} [deep=false] If set to `true` clones element and all its children recursively. When set to `false`,\n\t * element will be cloned without any children.\n\t * @returns {module:engine/view/element~Element} Clone of this element.\n\t */\n\t_clone( deep = false ) {\n\t\tconst childrenClone = [];\n\n\t\tif ( deep ) {\n\t\t\tfor ( const child of this.getChildren() ) {\n\t\t\t\tchildrenClone.push( child._clone( deep ) );\n\t\t\t}\n\t\t}\n\n\t\t// ContainerElement and AttributeElement should be also cloned properly.\n\t\tconst cloned = new this.constructor( this.name, this._attrs, childrenClone );\n\n\t\t// Classes and styles are cloned separately - this solution is faster than adding them back to attributes and\n\t\t// parse once again in constructor.\n\t\tcloned._classes = new Set( this._classes );\n\t\tcloned._styles = new Map( this._styles );\n\n\t\t// Clone custom properties.\n\t\tcloned._customProperties = new Map( this._customProperties );\n\n\t\t// Clone filler offset method.\n\t\t// We can't define this method in a prototype because it's behavior which\n\t\t// is changed by e.g. toWidget() function from ckeditor5-widget. Perhaps this should be one of custom props.\n\t\tcloned.getFillerOffset = this.getFillerOffset;\n\n\t\treturn cloned;\n\t}\n\n\t/**\n\t * {@link module:engine/view/element~Element#_insertChild Insert} a child node or a list of child nodes at the end of this node\n\t * and sets the parent of these nodes to this element.\n\t *\n\t * @see module:engine/view/writer~Writer#insert\n\t * @protected\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this element.\n\t *\n\t * @see module:engine/view/writer~Writer#insert\n\t * @protected\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @see module:engine/view/writer~Writer#remove\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @fires module:engine/view/node~Node#change\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Adds or overwrite attribute with a specified key and value.\n\t *\n\t * @see module:engine/view/writer~Writer#setAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @param {String} value Attribute value.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setAttribute( key, value ) {\n\t\tvalue = String( value );\n\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( key == 'class' ) {\n\t\t\tparseClasses( this._classes, value );\n\t\t} else if ( key == 'style' ) {\n\t\t\tparseInlineStyles( this._styles, value );\n\t\t} else {\n\t\t\tthis._attrs.set( key, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes attribute from the element.\n\t *\n\t * @see module:engine/view/writer~Writer#removeAttribute\n\t * @protected\n\t * @param {String} key Attribute key.\n\t * @returns {Boolean} Returns true if an attribute existed and has been removed.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeAttribute( key ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\t// Remove class attribute.\n\t\tif ( key == 'class' ) {\n\t\t\tif ( this._classes.size > 0 ) {\n\t\t\t\tthis._classes.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove style attribute.\n\t\tif ( key == 'style' ) {\n\t\t\tif ( this._styles.size > 0 ) {\n\t\t\t\tthis._styles.clear();\n\n\t\t\t\treturn true;\n\t\t\t}\n\n\t\t\treturn false;\n\t\t}\n\n\t\t// Remove other attributes.\n\t\treturn this._attrs.delete( key );\n\t}\n\n\t/**\n\t * Adds specified class.\n\t *\n\t *\t\telement._addClass( 'foo' ); // Adds 'foo' class.\n\t *\t\telement._addClass( [ 'foo', 'bar' ] ); // Adds 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/writer~Writer#addClass\n\t * @protected\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_addClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.add( name ) );\n\t}\n\n\t/**\n\t * Removes specified class.\n\t *\n\t *\t\telement._removeClass( 'foo' );  // Removes 'foo' class.\n\t *\t\telement._removeClass( [ 'foo', 'bar' ] ); // Removes both 'foo' and 'bar' classes.\n\t *\n\t * @see module:engine/view/writer~Writer#removeClass\n\t * @param {Array.<String>|String} className\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeClass( className ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tclassName = Array.isArray( className ) ? className : [ className ];\n\t\tclassName.forEach( name => this._classes.delete( name ) );\n\t}\n\n\t/**\n\t * Adds style to the element.\n\t *\n\t *\t\telement._setStyle( 'color', 'red' );\n\t *\t\telement._setStyle( {\n\t *\t\t\tcolor: 'red',\n\t *\t\t\tposition: 'fixed'\n\t *\t\t} );\n\t *\n\t * @see module:engine/view/writer~Writer#setStyle\n\t * @protected\n\t * @param {String|Object} property Property name or object with key - value pairs.\n\t * @param {String} [value] Value to set. This parameter is ignored if object is provided as the first parameter.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_setStyle( property, value ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tif ( isPlainObject( property ) ) {\n\t\t\tconst keys = Object.keys( property );\n\n\t\t\tfor ( const key of keys ) {\n\t\t\t\tthis._styles.set( key, property[ key ] );\n\t\t\t}\n\t\t} else {\n\t\t\tthis._styles.set( property, value );\n\t\t}\n\t}\n\n\t/**\n\t * Removes specified style.\n\t *\n\t *\t\telement._removeStyle( 'color' );  // Removes 'color' style.\n\t *\t\telement._removeStyle( [ 'color', 'border-top' ] ); // Removes both 'color' and 'border-top' styles.\n\t *\n\t * @see module:engine/view/writer~Writer#removeStyle\n\t * @protected\n\t * @param {Array.<String>|String} property\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_removeStyle( property ) {\n\t\tthis._fireChange( 'attributes', this );\n\n\t\tproperty = Array.isArray( property ) ? property : [ property ];\n\t\tproperty.forEach( name => this._styles.delete( name ) );\n\t}\n\n\t/**\n\t * Sets a custom property. Unlike attributes, custom properties are not rendered to the DOM,\n\t * so they can be used to add special data to elements.\n\t *\n\t * @see module:engine/view/writer~Writer#setCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @param {*} value\n\t */\n\t_setCustomProperty( key, value ) {\n\t\tthis._customProperties.set( key, value );\n\t}\n\n\t/**\n\t * Removes the custom property stored under the given key.\n\t *\n\t * @see module:engine/view/writer~Writer#removeCustomProperty\n\t * @protected\n\t * @param {String|Symbol} key\n\t * @returns {Boolean} Returns true if property was removed.\n\t */\n\t_removeCustomProperty( key ) {\n\t\treturn this._customProperties.delete( key );\n\t}\n\n\t/**\n\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t *\n\t * @abstract\n\t * @method module:engine/view/element~Element#getFillerOffset\n\t */\n}\n\n// Parses attributes provided to the element constructor before they are applied to an element. If attributes are passed\n// as an object (instead of `Map`), the object is transformed to the map. Attributes with `null` value are removed.\n// Attributes with non-`String` value are converted to `String`.\n//\n// @param {Object|Map} attrs Attributes to parse.\n// @returns {Map} Parsed attributes.\nfunction parseAttributes( attrs ) {\n\tif ( isPlainObject( attrs ) ) {\n\t\tattrs = objectToMap( attrs );\n\t} else {\n\t\tattrs = new Map( attrs );\n\t}\n\n\tfor ( const [ key, value ] of attrs ) {\n\t\tif ( value === null ) {\n\t\t\tattrs.delete( key );\n\t\t} else if ( typeof value != 'string' ) {\n\t\t\tattrs.set( key, String( value ) );\n\t\t}\n\t}\n\n\treturn attrs;\n}\n\n// Parses inline styles and puts property - value pairs into styles map.\n// Styles map is cleared before insertion.\n//\n// @param {Map.<String, String>} stylesMap Map to insert parsed properties and values.\n// @param {String} stylesString Styles to parse.\nfunction parseInlineStyles( stylesMap, stylesString ) {\n\t// `null` if no quote was found in input string or last found quote was a closing quote. See below.\n\tlet quoteType = null;\n\tlet propertyNameStart = 0;\n\tlet propertyValueStart = 0;\n\tlet propertyName = null;\n\n\tstylesMap.clear();\n\n\t// Do not set anything if input string is empty.\n\tif ( stylesString === '' ) {\n\t\treturn;\n\t}\n\n\t// Fix inline styles that do not end with `;` so they are compatible with algorithm below.\n\tif ( stylesString.charAt( stylesString.length - 1 ) != ';' ) {\n\t\tstylesString = stylesString + ';';\n\t}\n\n\t// Seek the whole string for \"special characters\".\n\tfor ( let i = 0; i < stylesString.length; i++ ) {\n\t\tconst char = stylesString.charAt( i );\n\n\t\tif ( quoteType === null ) {\n\t\t\t// No quote found yet or last found quote was a closing quote.\n\t\t\tswitch ( char ) {\n\t\t\t\tcase ':':\n\t\t\t\t\t// Most of time colon means that property name just ended.\n\t\t\t\t\t// Sometimes however `:` is found inside property value (for example in background image url).\n\t\t\t\t\tif ( !propertyName ) {\n\t\t\t\t\t\t// Treat this as end of property only if property name is not already saved.\n\t\t\t\t\t\t// Save property name.\n\t\t\t\t\t\tpropertyName = stylesString.substr( propertyNameStart, i - propertyNameStart );\n\t\t\t\t\t\t// Save this point as the start of property value.\n\t\t\t\t\t\tpropertyValueStart = i + 1;\n\t\t\t\t\t}\n\n\t\t\t\t\tbreak;\n\n\t\t\t\tcase '\"':\n\t\t\t\tcase '\\'':\n\t\t\t\t\t// Opening quote found (this is an opening quote, because `quoteType` is `null`).\n\t\t\t\t\tquoteType = char;\n\n\t\t\t\t\tbreak;\n\n\t\t\t\t// eslint-disable-next-line no-case-declarations\n\t\t\t\tcase ';':\n\t\t\t\t\t// Property value just ended.\n\t\t\t\t\t// Use previously stored property value start to obtain property value.\n\t\t\t\t\tconst propertyValue = stylesString.substr( propertyValueStart, i - propertyValueStart );\n\n\t\t\t\t\tif ( propertyName ) {\n\t\t\t\t\t\t// Save parsed part.\n\t\t\t\t\t\tstylesMap.set( propertyName.trim(), propertyValue.trim() );\n\t\t\t\t\t}\n\n\t\t\t\t\tpropertyName = null;\n\n\t\t\t\t\t// Save this point as property name start. Property name starts immediately after previous property value ends.\n\t\t\t\t\tpropertyNameStart = i + 1;\n\n\t\t\t\t\tbreak;\n\t\t\t}\n\t\t} else if ( char === quoteType ) {\n\t\t\t// If a quote char is found and it is a closing quote, mark this fact by `null`-ing `quoteType`.\n\t\t\tquoteType = null;\n\t\t}\n\t}\n}\n\n// Parses class attribute and puts all classes into classes set.\n// Classes set s cleared before insertion.\n//\n// @param {Set.<String>} classesSet Set to insert parsed classes.\n// @param {String} classesString String with classes to parse.\nfunction parseClasses( classesSet, classesString ) {\n\tconst classArray = classesString.split( /\\s+/ );\n\tclassesSet.clear();\n\tclassArray.forEach( name => classesSet.add( name ) );\n}\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @return {Iterable.<module:engine/view/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/treewalker\n */\n\nimport Element from './element';\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport Position from './position';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\n\n/**\n * Position iterator class. It allows to iterate forward and backward over the document.\n */\nexport default class TreeWalker {\n\t/**\n\t * Creates a range iterator. All parameters are optional, but you have to specify either `boundaries` or `startPosition`.\n\t *\n\t * @constructor\n\t * @param {Object} options Object with configuration.\n\t * @param {module:engine/view/range~Range} [options.boundaries=null] Range to define boundaries of the iterator.\n\t * @param {module:engine/view/position~Position} [options.startPosition] Starting position.\n\t * @param {'forward'|'backward'} [options.direction='forward'] Walking direction.\n\t * @param {Boolean} [options.singleCharacters=false] Flag indicating whether all characters from\n\t * {@link module:engine/view/text~Text} should be returned as one {@link module:engine/view/text~Text} (`false`) ore one by one as\n\t * {@link module:engine/view/textproxy~TextProxy} (`true`).\n\t * @param {Boolean} [options.shallow=false] Flag indicating whether iterator should enter elements or not. If the\n\t * iterator is shallow child nodes of any iterated node will not be returned along with `elementEnd` tag.\n\t * @param {Boolean} [options.ignoreElementEnd=false] Flag indicating whether iterator should ignore `elementEnd`\n\t * tags. If the option is true walker will not return a parent node of start position. If this option is `true`\n\t * each {@link module:engine/view/element~Element} will be returned once, while if the option is `false` they might be returned\n\t * twice: for `'elementStart'` and `'elementEnd'`.\n\t */\n\tconstructor( options = {} ) {\n\t\tif ( !options.boundaries && !options.startPosition ) {\n\t\t\t/**\n\t\t\t * Neither boundaries nor starting position have been defined.\n\t\t\t *\n\t\t\t * @error view-tree-walker-no-start-position\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-tree-walker-no-start-position: Neither boundaries nor starting position have been defined.' );\n\t\t}\n\n\t\tif ( options.direction && options.direction != 'forward' && options.direction != 'backward' ) {\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-tree-walker-unknown-direction: Only `backward` and `forward` direction allowed.',\n\t\t\t\t{ direction: options.direction }\n\t\t\t);\n\t\t}\n\n\t\t/**\n\t\t * Iterator boundaries.\n\t\t *\n\t\t * When the iterator is walking `'forward'` on the end of boundary or is walking `'backward'`\n\t\t * on the start of boundary, then `{ done: true }` is returned.\n\t\t *\n\t\t * If boundaries are not defined they are set before first and after last child of the root node.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/range~Range} module:engine/view/treewalker~TreeWalker#boundaries\n\t\t */\n\t\tthis.boundaries = options.boundaries || null;\n\n\t\t/**\n\t\t * Iterator position. If start position is not defined then position depends on {@link #direction}. If direction is\n\t\t * `'forward'` position starts form the beginning, when direction is `'backward'` position starts from the end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position} module:engine/view/treewalker~TreeWalker#position\n\t\t */\n\t\tif ( options.startPosition ) {\n\t\t\tthis.position = Position.createFromPosition( options.startPosition );\n\t\t} else {\n\t\t\tthis.position = Position.createFromPosition( options.boundaries[ options.direction == 'backward' ? 'end' : 'start' ] );\n\t\t}\n\n\t\t/**\n\t\t * Walking direction. Defaults `'forward'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {'backward'|'forward'} module:engine/view/treewalker~TreeWalker#direction\n\t\t */\n\t\tthis.direction = options.direction || 'forward';\n\n\t\t/**\n\t\t * Flag indicating whether all characters from {@link module:engine/view/text~Text} should be returned as one\n\t\t * {@link module:engine/view/text~Text} or one by one as {@link module:engine/view/textproxy~TextProxy}.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#singleCharacters\n\t\t */\n\t\tthis.singleCharacters = !!options.singleCharacters;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should enter elements or not. If the iterator is shallow child nodes of any\n\t\t * iterated node will not be returned along with `elementEnd` tag.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#shallow\n\t\t */\n\t\tthis.shallow = !!options.shallow;\n\n\t\t/**\n\t\t * Flag indicating whether iterator should ignore `elementEnd` tags. If set to `true`, walker will not\n\t\t * return a parent node of the start position. Each {@link module:engine/view/element~Element} will be returned once.\n\t\t * When set to `false` each element might be returned twice: for `'elementStart'` and `'elementEnd'`.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} module:engine/view/treewalker~TreeWalker#ignoreElementEnd\n\t\t */\n\t\tthis.ignoreElementEnd = !!options.ignoreElementEnd;\n\n\t\t/**\n\t\t * Start boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryStartParent\n\t\t */\n\t\tthis._boundaryStartParent = this.boundaries ? this.boundaries.start.parent : null;\n\n\t\t/**\n\t\t * End boundary parent.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/node~Node} module:engine/view/treewalker~TreeWalker#_boundaryEndParent\n\t\t */\n\t\tthis._boundaryEndParent = this.boundaries ? this.boundaries.end.parent : null;\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Moves {@link #position} in the {@link #direction} skipping values as long as the callback function returns `true`.\n\t *\n\t * For example:\n\t *\n\t * \t\twalker.skip( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\twalker.skip( value => true ); // Move the position to the end: <p>{}foo</p> -> <p>foo</p>[]\n\t * \t\twalker.skip( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t */\n\tskip( skip ) {\n\t\tlet done, value, prevPosition;\n\n\t\tdo {\n\t\t\tprevPosition = this.position;\n\n\t\t\t( { done, value } = this.next() );\n\t\t} while ( !done && skip( value ) );\n\n\t\tif ( !done ) {\n\t\t\tthis.position = prevPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Gets the next tree walker's value.\n\t *\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} Object implementing iterator interface, returning\n\t * information about taken step.\n\t */\n\tnext() {\n\t\tif ( this.direction == 'forward' ) {\n\t\t\treturn this._next();\n\t\t} else {\n\t\t\treturn this._previous();\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step forward in view. Moves the {@link #position} to the next position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done `true` if iterator is done, `false` otherwise.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_next() {\n\t\tlet position = Position.createFromPosition( this.position );\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the end of the root.\n\t\tif ( parent.parent === null && position.offset === parent.childCount ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent === this._boundaryEndParent && position.offset == this.boundaries.end.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just after current position.\n\t\tlet node;\n\n\t\t// Text is a specific parent because it contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtEnd ) {\n\t\t\t\t// Prevent returning \"elementEnd\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position.createAfter( parent );\n\n\t\t\t\treturn this._next();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t} else {\n\t\t\t\tposition.offset++;\n\t\t\t}\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, 0 );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryEndParent ) {\n\t\t\t\t\tcharactersCount = this.boundaries.end.offset;\n\t\t\t\t\titem = new TextProxy( node, 0, charactersCount );\n\t\t\t\t\tposition = Position.createAfter( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving forward.\n\t\t\t\t\tposition.offset++;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\ttextLength = 1;\n\t\t\t} else {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst endOffset = parent === this._boundaryEndParent ? this.boundaries.end.offset : parent.data.length;\n\n\t\t\t\ttextLength = endOffset - position.offset;\n\t\t\t}\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tposition.offset += textLength;\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the end of current `parent`.\n\t\t\tposition = Position.createAfter( parent );\n\t\t\tthis.position = position;\n\n\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\treturn this._next();\n\t\t\t} else {\n\t\t\t\treturn this._formatReturnValue( 'elementEnd', parent, previousPosition, position );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Makes a step backward in view. Moves the {@link #position} to the previous position and returns the encountered value.\n\t *\n\t * @private\n\t * @returns {Object}\n\t * @returns {Boolean} return.done True if iterator is done.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue} return.value Information about taken step.\n\t */\n\t_previous() {\n\t\tlet position = Position.createFromPosition( this.position );\n\t\tconst previousPosition = this.position;\n\t\tconst parent = position.parent;\n\n\t\t// We are at the beginning of the root.\n\t\tif ( parent.parent === null && position.offset === 0 ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// We reached the walker boundary.\n\t\tif ( parent == this._boundaryStartParent && position.offset == this.boundaries.start.offset ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Get node just before current position.\n\t\tlet node;\n\n\t\t// Text {@link module:engine/view/text~Text} element is a specific parent because contains string instead of child nodes.\n\t\tif ( parent instanceof Text ) {\n\t\t\tif ( position.isAtStart ) {\n\t\t\t\t// Prevent returning \"elementStart\" for Text node. Skip that value and return the next walker step.\n\t\t\t\tthis.position = Position.createBefore( parent );\n\n\t\t\t\treturn this._previous();\n\t\t\t}\n\n\t\t\tnode = parent.data[ position.offset - 1 ];\n\t\t} else {\n\t\t\tnode = parent.getChild( position.offset - 1 );\n\t\t}\n\n\t\tif ( node instanceof Element ) {\n\t\t\tif ( !this.shallow ) {\n\t\t\t\tposition = new Position( node, node.childCount );\n\t\t\t\tthis.position = position;\n\n\t\t\t\tif ( this.ignoreElementEnd ) {\n\t\t\t\t\treturn this._previous();\n\t\t\t\t} else {\n\t\t\t\t\treturn this._formatReturnValue( 'elementEnd', node, previousPosition, position );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tposition.offset--;\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'elementStart', node, previousPosition, position, 1 );\n\t\t\t}\n\t\t} else if ( node instanceof Text ) {\n\t\t\tif ( this.singleCharacters ) {\n\t\t\t\tposition = new Position( node, node.data.length );\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._previous();\n\t\t\t} else {\n\t\t\t\tlet charactersCount = node.data.length;\n\t\t\t\tlet item;\n\n\t\t\t\t// If text stick out of walker range, we need to cut it and wrap by TextProxy.\n\t\t\t\tif ( node == this._boundaryStartParent ) {\n\t\t\t\t\tconst offset = this.boundaries.start.offset;\n\n\t\t\t\t\titem = new TextProxy( node, offset, node.data.length - offset );\n\t\t\t\t\tcharactersCount = item.data.length;\n\t\t\t\t\tposition = Position.createBefore( item );\n\t\t\t\t} else {\n\t\t\t\t\titem = new TextProxy( node, 0, node.data.length );\n\t\t\t\t\t// If not just keep moving backward.\n\t\t\t\t\tposition.offset--;\n\t\t\t\t}\n\n\t\t\t\tthis.position = position;\n\n\t\t\t\treturn this._formatReturnValue( 'text', item, previousPosition, position, charactersCount );\n\t\t\t}\n\t\t} else if ( typeof node == 'string' ) {\n\t\t\tlet textLength;\n\n\t\t\tif ( !this.singleCharacters ) {\n\t\t\t\t// Check if text stick out of walker range.\n\t\t\t\tconst startOffset = parent === this._boundaryStartParent ? this.boundaries.start.offset : 0;\n\n\t\t\t\ttextLength = position.offset - startOffset;\n\t\t\t} else {\n\t\t\t\ttextLength = 1;\n\t\t\t}\n\n\t\t\tposition.offset -= textLength;\n\n\t\t\tconst textProxy = new TextProxy( parent, position.offset, textLength );\n\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'text', textProxy, previousPosition, position, textLength );\n\t\t} else {\n\t\t\t// `node` is not set, we reached the beginning of current `parent`.\n\t\t\tposition = Position.createBefore( parent );\n\t\t\tthis.position = position;\n\n\t\t\treturn this._formatReturnValue( 'elementStart', parent, previousPosition, position, 1 );\n\t\t}\n\t}\n\n\t/**\n\t * Format returned data and adjust `previousPosition` and `nextPosition` if reach the bound of the {@link module:engine/view/text~Text}.\n\t *\n\t * @private\n\t * @param {module:engine/view/treewalker~TreeWalkerValueType} type Type of step.\n\t * @param {module:engine/view/item~Item} item Item between old and new position.\n\t * @param {module:engine/view/position~Position} previousPosition Previous position of iterator.\n\t * @param {module:engine/view/position~Position} nextPosition Next position of iterator.\n\t * @param {Number} [length] Length of the item.\n\t * @returns {module:engine/view/treewalker~TreeWalkerValue}\n\t */\n\t_formatReturnValue( type, item, previousPosition, nextPosition, length ) {\n\t\t// Text is a specific parent, because contains string instead of children.\n\t\t// Walker doesn't enter to the Text except situations when walker is iterating over every single character,\n\t\t// or the bound starts/ends inside the Text. So when the position is at the beginning or at the end of the Text\n\t\t// we move it just before or just after Text.\n\t\tif ( item instanceof TextProxy ) {\n\t\t\t// Position is at the end of Text.\n\t\t\tif ( item.offsetInText + item.data.length == item.textNode.data.length ) {\n\t\t\t\tif ( this.direction == 'forward' && !( this.boundaries && this.boundaries.end.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position.createAfter( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position.createAfter( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Position is at the begining ot the text.\n\t\t\tif ( item.offsetInText === 0 ) {\n\t\t\t\tif ( this.direction == 'backward' && !( this.boundaries && this.boundaries.start.isEqual( this.position ) ) ) {\n\t\t\t\t\tnextPosition = Position.createBefore( item.textNode );\n\t\t\t\t\t// When we change nextPosition of returned value we need also update walker current position.\n\t\t\t\t\tthis.position = nextPosition;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousPosition = Position.createBefore( item.textNode );\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn {\n\t\t\tdone: false,\n\t\t\tvalue: {\n\t\t\t\ttype,\n\t\t\t\titem,\n\t\t\t\tpreviousPosition,\n\t\t\t\tnextPosition,\n\t\t\t\tlength\n\t\t\t}\n\t\t};\n\t}\n}\n\n/**\n * Type of the step made by {@link module:engine/view/treewalker~TreeWalker}.\n * Possible values: `'elementStart'` if walker is at the beginning of a node, `'elementEnd'` if walker is at the end\n * of node, or `'text'` if walker traversed over single and multiple characters.\n * For {@link module:engine/view/text~Text} `elementStart` and `elementEnd` is not returned.\n *\n * @typedef {String} module:engine/view/treewalker~TreeWalkerValueType\n */\n\n/**\n * Object returned by {@link module:engine/view/treewalker~TreeWalker} when traversing tree view.\n *\n * @typedef {Object} module:engine/view/treewalker~TreeWalkerValue\n * @property {module:engine/view/treewalker~TreeWalkerValueType} type\n * @property {module:engine/view/item~Item} item Item between old and new positions of {@link module:engine/view/treewalker~TreeWalker}.\n * @property {module:engine/view/position~Position} previousPosition Previous position of the iterator.\n * * Forward iteration: For `'elementEnd'` it is the last position inside the element. For all other types it is the\n * position before the item. Note that it is more efficient to use this position then calculate the position before\n * the node using {@link module:engine/view/position~Position.createBefore}.\n * * Backward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the Text to its parent just before or just after Text.\n * @property {module:engine/view/position~Position} nextPosition Next position of the iterator.\n * * Forward iteration: For `'elementStart'` it is the first position inside the element. For all other types it is\n * the position after the item.\n * * Backward iteration: For `'elementEnd'` it is last position inside element. For all other types it is the position\n * before the item.\n * * If the position is at the beginning or at the end of the {@link module:engine/view/text~Text} it is always moved from the\n * inside of the Text to its parent just before or just after Text.\n * @property {Number} [length] Length of the item. For `'elementStart'` it is 1. For `'text'` it is\n * the length of the text. For `'elementEnd'` it is undefined.\n */\n\n/**\n * Tree walking directions.\n *\n * @typedef {'forward'|'backward'} module:engine/view/treewalker~TreeWalkerDirection\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/containerelement\n */\n\nimport Element from './element';\n\n/**\n * Containers are elements which define document structure. They define boundaries for\n * {@link module:engine/view/attributeelement~AttributeElement attributes}. They are mostly use for block elements like `<p>` or `<div>`.\n *\n * Editing engine does not define fixed HTML DTD. This is why the type of the {@link module:engine/view/element~Element} need to\n * be defined by the feature developer.\n *\n * Creating an element you should use `ContainerElement` class or {@link module:engine/view/attributeelement~AttributeElement}. This is\n * important to define the type of the element because of two reasons:\n *\n * Firstly, {@link module:engine/view/domconverter~DomConverter} needs the information what is an editable block to convert elements to\n * DOM properly. {@link module:engine/view/domconverter~DomConverter} will ensure that `ContainerElement` is editable and it is possible\n * to put caret inside it, even if the container is empty.\n *\n * Secondly, {@link module:engine/view/writer~Writer view writer} uses this information.\n * Nodes {@link module:engine/view/writer~Writer#breakAttributes breaking} and {@link module:engine/view/writer~Writer#mergeAttributes\n * merging}\n * is performed only in a bounds of a container nodes.\n *\n * For instance if `<p>` is an container and `<b>` is attribute:\n *\n *\t\t<p><b>fo^o</b></p>\n *\n * {@link module:engine/view/writer~Writer#breakAttributes breakAttributes} will create:\n *\n *\t\t<p><b>fo</b><b>o</b></p>\n *\n * There might be a need to mark `<span>` element as a container node, for example in situation when it will be a\n * container of an inline widget:\n *\n *\t\t<span color=\"red\">foobar</span>\t\t// attribute\n *\t\t<span data-widget>foobar</span>\t\t// container\n *\n * @extends module:engine/view/element~Element\n */\nexport default class ContainerElement extends Element {\n\t/**\n\t * Creates a container element.\n\t *\n\t * @see module:engine/view/element~Element\n\t * @see module:engine/view/writer~Writer#createContainerElement\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n\t\t *\n\t\t * @method #getFillerOffset\n\t\t * @returns {Number|null} Block filler offset or `null` if block filler is not needed.\n\t\t */\n\t\tthis.getFillerOffset = getFillerOffset;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tis( type, name = null ) {\n\t\tif ( !name ) {\n\t\t\treturn type == 'containerElement' || super.is( type );\n\t\t} else {\n\t\t\treturn ( type == 'containerElement' && name == this.name ) || super.is( type, name );\n\t\t}\n\t}\n}\n\n// Returns block {@link module:engine/view/filler filler} offset or `null` if block filler is not needed.\n//\n// @returns {Number|null} Block filler offset or `null` if block filler is not needed.\nfunction getFillerOffset() {\n\tfor ( const child of this.getChildren() ) {\n\t\t// If there's any non-UI element – don't render the bogus.\n\t\tif ( !child.is( 'uiElement' ) ) {\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t// If there are only UI elements – render the bogus at the end of the element.\n\treturn this.childCount;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/editableelement\n */\n\nimport ContainerElement from './containerelement';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport ObservableMixin from '@ckeditor/ckeditor5-utils/src/observablemixin';\n\nconst documentSymbol = Symbol( 'document' );\n\n/**\n * Editable element which can be a {@link module:engine/view/rooteditableelement~RootEditableElement root}\n * or nested editable area in the editor.\n *\n * Editable is automatically read-only when its {module:engine/view/document~Document Document} is read-only.\n *\n * @extends module:engine/view/containerelement~ContainerElement\n * @mixes module:utils/observablemixin~ObservableMixin\n */\nexport default class EditableElement extends ContainerElement {\n\t/**\n\t * Creates an editable element.\n\t *\n\t * @see module:engine/view/writer~Writer#createEditableElement\n\t * @protected\n\t */\n\tconstructor( name, attrs, children ) {\n\t\tsuper( name, attrs, children );\n\n\t\t/**\n\t\t * Whether the editable is in read-write or read-only mode.\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isReadOnly\n\t\t */\n\t\tthis.set( 'isReadOnly', false );\n\n\t\t/**\n\t\t * Whether the editable is focused.\n\t\t *\n\t\t * This property updates when {@link module:engine/view/document~Document#isFocused document.isFocused} or view\n\t\t * selection is changed.\n\t\t *\n\t\t * @readonly\n\t\t * @observable\n\t\t * @member {Boolean} module:engine/view/editableelement~EditableElement#isFocused\n\t\t */\n\t\tthis.set( 'isFocused', false );\n\n\t\t/**\n\t\t * The {@link module:engine/view/document~Document} which is an owner of this root.\n\t\t * Can only by set once.\n\t\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-editableelement-document-already-set`\n\t\t * when document is already set.\n\t\t *\n\t\t * @member {module:engine/view/document~Document} #document\n\t\t */\n\t}\n\n\t/**\n\t * Returns document associated with the editable.\n\t *\n\t * @readonly\n\t * @return {module:engine/view/document~Document}\n\t */\n\tget document() {\n\t\treturn this.getCustomProperty( documentSymbol );\n\t}\n\n\t/**\n\t * Sets document of this editable element.\n\t *\n\t * @protected\n\t * @param {module:engine/view/document~Document} document\n\t */\n\tset _document( document ) {\n\t\tif ( this.getCustomProperty( documentSymbol ) ) {\n\t\t\t/**\n\t\t\t * View document is already set. It can only be set once.\n\t\t\t *\n\t\t\t * @error view-editableelement-document-already-set\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-editableelement-document-already-set: View document is already set.' );\n\t\t}\n\n\t\tthis._setCustomProperty( documentSymbol, document );\n\n\t\tthis.bind( 'isReadOnly' ).to( document );\n\n\t\tthis.bind( 'isFocused' ).to(\n\t\t\tdocument,\n\t\t\t'isFocused',\n\t\t\tisFocused => isFocused && document.selection.editableElement == this\n\t\t);\n\n\t\t// Update focus state based on selection changes.\n\t\tthis.listenTo( document.selection, 'change', () => {\n\t\t\tthis.isFocused = document.isFocused && document.selection.editableElement == this;\n\t\t} );\n\t}\n}\n\nmix( EditableElement, ObservableMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/position\n */\n\nimport TreeWalker from './treewalker';\n\nimport compareArrays from '@ckeditor/ckeditor5-utils/src/comparearrays';\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport EditableElement from './editableelement';\n\n/**\n * Position in the tree. Position is always located before or after a node.\n */\nexport default class Position {\n\t/**\n\t * Creates a position.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} parent Position parent.\n\t * @param {Number} offset Position offset.\n\t */\n\tconstructor( parent, offset ) {\n\t\t/**\n\t\t * Position parent.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t\t * module:engine/view/position~Position#parent\n\t\t */\n\t\tthis.parent = parent;\n\n\t\t/**\n\t\t * Position offset.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number} module:engine/view/position~Position#offset\n\t\t */\n\t\tthis.offset = offset;\n\t}\n\n\t/**\n\t * Node directly after the position. Equals `null` when there is no node after position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeAfter() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset ) || null;\n\t}\n\n\t/**\n\t * Node directly before the position. Equals `null` when there is no node before position or position is located\n\t * inside text node.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|null}\n\t */\n\tget nodeBefore() {\n\t\tif ( this.parent.is( 'text' ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\treturn this.parent.getChild( this.offset - 1 ) || null;\n\t}\n\n\t/**\n\t * Is `true` if position is at the beginning of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtStart() {\n\t\treturn this.offset === 0;\n\t}\n\n\t/**\n\t * Is `true` if position is at the end of its {@link module:engine/view/position~Position#parent parent}, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isAtEnd() {\n\t\tconst endOffset = this.parent.is( 'text' ) ? this.parent.data.length : this.parent.childCount;\n\n\t\treturn this.offset === endOffset;\n\t}\n\n\t/**\n\t * Position's root, that is the root of the position's parent element.\n\t *\n\t * @readonly\n\t * @type {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.parent.root;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this position, or `null` if\n\t * position is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tlet editable = this.parent;\n\n\t\twhile ( !( editable instanceof EditableElement ) ) {\n\t\t\tif ( editable.parent ) {\n\t\t\t\teditable = editable.parent;\n\t\t\t} else {\n\t\t\t\treturn null;\n\t\t\t}\n\t\t}\n\n\t\treturn editable;\n\t}\n\n\t/**\n\t * Returns a new instance of Position with offset incremented by `shift` value.\n\t *\n\t * @param {Number} shift How position offset should get changed. Accepts negative values.\n\t * @returns {module:engine/view/position~Position} Shifted position.\n\t */\n\tgetShiftedBy( shift ) {\n\t\tconst shifted = Position.createFromPosition( this );\n\n\t\tconst offset = shifted.offset + shift;\n\t\tshifted.offset = offset < 0 ? 0 : offset;\n\n\t\treturn shifted;\n\t}\n\n\t/**\n\t * Gets the farthest position which matches the callback using\n\t * {@link module:engine/view/treewalker~TreeWalker TreeWalker}.\n\t *\n\t * For example:\n\t *\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text' ); // <p>{}foo</p> -> <p>foo[]</p>\n\t * \t\tgetLastMatchingPosition( value => value.type == 'text', { direction: 'backward' } ); // <p>foo[]</p> -> <p>{}foo</p>\n\t * \t\tgetLastMatchingPosition( value => false ); // Do not move the position.\n\t *\n\t * @param {Function} skip Callback function. Gets {@link module:engine/view/treewalker~TreeWalkerValue} and should\n\t * return `true` if the value should be skipped or `false` if not.\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t *\n\t * @returns {module:engine/view/position~Position} The position after the last item which matches the `skip` callback test.\n\t */\n\tgetLastMatchingPosition( skip, options = {} ) {\n\t\toptions.startPosition = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\t\ttreeWalker.skip( skip );\n\n\t\treturn treeWalker.position;\n\t}\n\n\t/**\n\t * Returns ancestors array of this position, that is this position's parent and it's ancestors.\n\t *\n\t * @returns {Array} Array with ancestors.\n\t */\n\tgetAncestors() {\n\t\tif ( this.parent.is( 'documentFragment' ) ) {\n\t\t\treturn [ this.parent ];\n\t\t} else {\n\t\t\treturn this.parent.getAncestors( { includeSelf: true } );\n\t\t}\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of both positions.\n\t *\n\t * @param {module:engine/view/position~Position} position\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor( position ) {\n\t\tconst ancestorsA = this.getAncestors();\n\t\tconst ancestorsB = position.getAncestors();\n\n\t\tlet i = 0;\n\n\t\twhile ( ancestorsA[ i ] == ancestorsB[ i ] && ancestorsA[ i ] ) {\n\t\t\ti++;\n\t\t}\n\n\t\treturn i === 0 ? null : ancestorsA[ i - 1 ];\n\t}\n\n\t/**\n\t * Checks whether this position equals given position.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} True if positions are same.\n\t */\n\tisEqual( otherPosition ) {\n\t\treturn ( this.parent == otherPosition.parent && this.offset == otherPosition.offset );\n\t}\n\n\t/**\n\t * Checks whether this position is located before given position. When method returns `false` it does not mean that\n\t * this position is after give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isAfter\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is before given position.\n\t */\n\tisBefore( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'before';\n\t}\n\n\t/**\n\t * Checks whether this position is located after given position. When method returns `false` it does not mean that\n\t * this position is before give one. Two positions may be located inside separate roots and in that situation this\n\t * method will still return `false`.\n\t *\n\t * @see module:engine/view/position~Position#isBefore\n\t * @see module:engine/view/position~Position#compareWith\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {Boolean} Returns `true` if this position is after given position.\n\t */\n\tisAfter( otherPosition ) {\n\t\treturn this.compareWith( otherPosition ) == 'after';\n\t}\n\n\t/**\n\t * Checks whether this position is before, after or in same position that other position. Two positions may be also\n\t * different when they are located in separate roots.\n\t *\n\t * @param {module:engine/view/position~Position} otherPosition Position to compare with.\n\t * @returns {module:engine/view/position~PositionRelation}\n\t */\n\tcompareWith( otherPosition ) {\n\t\tif ( this.root !== otherPosition.root ) {\n\t\t\treturn 'different';\n\t\t}\n\n\t\tif ( this.isEqual( otherPosition ) ) {\n\t\t\treturn 'same';\n\t\t}\n\n\t\t// Get path from root to position's parent element.\n\t\tconst thisPath = this.parent.is( 'node' ) ? this.parent.getPath() : [];\n\t\tconst otherPath = otherPosition.parent.is( 'node' ) ? otherPosition.parent.getPath() : [];\n\n\t\t// Add the positions' offsets to the parents offsets.\n\t\tthisPath.push( this.offset );\n\t\totherPath.push( otherPosition.offset );\n\n\t\t// Compare both path arrays to find common ancestor.\n\t\tconst result = compareArrays( thisPath, otherPath );\n\n\t\tswitch ( result ) {\n\t\t\tcase 'prefix':\n\t\t\t\treturn 'before';\n\n\t\t\tcase 'extension':\n\t\t\t\treturn 'after';\n\n\t\t\tdefault:\n\t\t\t\treturn thisPath[ result ] < otherPath[ result ] ? 'before' : 'after';\n\t\t}\n\t}\n\n\t/**\n\t * Creates position at the given location. The location can be specified as:\n\t *\n\t * * a {@link module:engine/view/position~Position position},\n\t * * parent element and offset (offset defaults to `0`),\n\t * * parent element and `'end'` (sets position at the end of that element),\n\t * * {@link module:engine/view/item~Item view item} and `'before'` or `'after'` (sets position before or after given view item).\n\t *\n\t * This method is a shortcut to other constructors such as:\n\t *\n\t * * {@link module:engine/view/position~Position.createBefore},\n\t * * {@link module:engine/view/position~Position.createAfter},\n\t * * {@link module:engine/view/position~Position.createFromPosition}.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/model/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic createAt( itemOrPosition, offset ) {\n\t\tif ( itemOrPosition instanceof Position ) {\n\t\t\treturn this.createFromPosition( itemOrPosition );\n\t\t} else {\n\t\t\tconst node = itemOrPosition;\n\n\t\t\tif ( offset == 'end' ) {\n\t\t\t\toffset = node.is( 'text' ) ? node.data.length : node.childCount;\n\t\t\t} else if ( offset == 'before' ) {\n\t\t\t\treturn this.createBefore( node );\n\t\t\t} else if ( offset == 'after' ) {\n\t\t\t\treturn this.createAfter( node );\n\t\t\t} else if ( !offset ) {\n\t\t\t\toffset = 0;\n\t\t\t}\n\n\t\t\treturn new Position( node, offset );\n\t\t}\n\t}\n\n\t/**\n\t * Creates a new position after given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item after which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createAfter( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText + item.data.length );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You can not make a position after a root.\n\t\t\t *\n\t\t\t * @error view-position-after-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-after-root: You can not make position after root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index + 1 );\n\t}\n\n\t/**\n\t * Creates a new position before given view item.\n\t *\n\t * @param {module:engine/view/item~Item} item View item before which the position should be located.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createBefore( item ) {\n\t\t// TextProxy is not a instance of Node so we need do handle it in specific way.\n\t\tif ( item.is( 'textProxy' ) ) {\n\t\t\treturn new Position( item.textNode, item.offsetInText );\n\t\t}\n\n\t\tif ( !item.parent ) {\n\t\t\t/**\n\t\t\t * You cannot make a position before a root.\n\t\t\t *\n\t\t\t * @error view-position-before-root\n\t\t\t * @param {module:engine/view/node~Node} root\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-position-before-root: You can not make position before root.', { root: item } );\n\t\t}\n\n\t\treturn new Position( item.parent, item.index );\n\t}\n\n\t/**\n\t * Creates and returns a new instance of `Position`, which is equal to the passed position.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to be cloned.\n\t * @returns {module:engine/view/position~Position}\n\t */\n\tstatic createFromPosition( position ) {\n\t\treturn new this( position.parent, position.offset );\n\t}\n}\n\n/**\n * A flag indicating whether this position is `'before'` or `'after'` or `'same'` as given position.\n * If positions are in different roots `'different'` flag is returned.\n *\n * @typedef {String} module:engine/view/position~PositionRelation\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/range\n */\n\nimport Position from './position';\nimport TreeWalker from './treewalker';\n\n/**\n * Tree view range.\n */\nexport default class Range {\n\t/**\n\t * Creates a range spanning from `start` position to `end` position.\n\t *\n\t * **Note:** Constructor creates it's own {@link module:engine/view/position~Position} instances basing on passed values.\n\t *\n\t * @param {module:engine/view/position~Position} start Start position.\n\t * @param {module:engine/view/position~Position} [end] End position. If not set, range will be collapsed at `start` position.\n\t */\n\tconstructor( start, end = null ) {\n\t\t/**\n\t\t * Start position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.start = Position.createFromPosition( start );\n\n\t\t/**\n\t\t * End position.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/view/position~Position}\n\t\t */\n\t\tthis.end = end ? Position.createFromPosition( end ) : Position.createFromPosition( start );\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them together with additional information like length or {@link module:engine/view/position~Position positions},\n\t * grouped as {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * This iterator uses {@link module:engine/view/treewalker~TreeWalker TreeWalker} with `boundaries` set to this range and\n\t * `ignoreElementEnd` option\n\t * set to `true`.\n\t *\n\t * @returns {Iterable.<module:engine/view/treewalker~TreeWalkerValue>}\n\t */\n\t* [ Symbol.iterator ]() {\n\t\tyield* new TreeWalker( { boundaries: this, ignoreElementEnd: true } );\n\t}\n\n\t/**\n\t * Returns whether the range is collapsed, that is it start and end positions are equal.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.start.isEqual( this.end );\n\t}\n\n\t/**\n\t * Returns whether this range is flat, that is if {@link module:engine/view/range~Range#start start} position and\n\t * {@link module:engine/view/range~Range#end end} position are in the same {@link module:engine/view/position~Position#parent parent}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isFlat() {\n\t\treturn this.start.parent === this.end.parent;\n\t}\n\n\t/**\n\t * Range root element.\n\t *\n\t * @type {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this.start.root;\n\t}\n\n\t/**\n\t * Creates a maximal range that has the same content as this range but is expanded in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t * \t\t<p>Foo</p><p><b>{Bar}</b></p> -> <p>Foo</p>[<p><b>Bar</b>]</p>\n\t * \t\t<p><b>foo</b>{bar}<span></span></p> -> <p><b>foo[</b>bar<span></span>]</p>\n\t *\n\t * Note that in the sample above:\n\t *  - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t *  - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t *  - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Enlarged range.\n\t */\n\tgetEnlarged() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\t// Fix positions, in case if they are in Text node.\n\t\tif ( start.parent.is( 'text' ) && start.isAtStart ) {\n\t\t\tstart = Position.createBefore( start.parent );\n\t\t}\n\n\t\tif ( end.parent.is( 'text' ) && end.isAtEnd ) {\n\t\t\tend = Position.createAfter( end.parent );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Creates a minimum range that has the same content as this range but is trimmed in both ways (at the beginning\n\t * and at the end).\n\t *\n\t * For example:\n\t *\n\t * \t\t<p>Foo</p>[<p><b>Bar</b>]</p> -> <p>Foo</p><p><b>{Bar}</b></p>\n\t * \t\t<p><b>foo[</b>bar<span></span>]</p> -> <p><b>foo</b>{bar}<span></span></p>\n\t *\n\t * Note that in the sample above:\n\t *  - `<p>` have type of {@link module:engine/view/containerelement~ContainerElement},\n\t *  - `<b>` have type of {@link module:engine/view/attributeelement~AttributeElement},\n\t *  - `<span>` have type of {@link module:engine/view/uielement~UIElement}.\n\t *\n\t * @returns {module:engine/view/range~Range} Shrink range.\n\t */\n\tgetTrimmed() {\n\t\tlet start = this.start.getLastMatchingPosition( enlargeTrimSkip );\n\n\t\tif ( start.isAfter( this.end ) || start.isEqual( this.end ) ) {\n\t\t\treturn new Range( start, start );\n\t\t}\n\n\t\tlet end = this.end.getLastMatchingPosition( enlargeTrimSkip, { direction: 'backward' } );\n\t\tconst nodeAfterStart = start.nodeAfter;\n\t\tconst nodeBeforeEnd = end.nodeBefore;\n\n\t\t// Because TreeWalker prefers positions next to text node, we need to move them manually into these text nodes.\n\t\tif ( nodeAfterStart && nodeAfterStart.is( 'text' ) ) {\n\t\t\tstart = new Position( nodeAfterStart, 0 );\n\t\t}\n\n\t\tif ( nodeBeforeEnd && nodeBeforeEnd.is( 'text' ) ) {\n\t\t\tend = new Position( nodeBeforeEnd, nodeBeforeEnd.data.length );\n\t\t}\n\n\t\treturn new Range( start, end );\n\t}\n\n\t/**\n\t * Two ranges are equal if their start and end positions are equal.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} `true` if ranges are equal, `false` otherwise\n\t */\n\tisEqual( otherRange ) {\n\t\treturn this == otherRange || ( this.start.isEqual( otherRange.start ) && this.end.isEqual( otherRange.end ) );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/position~Position position}.\n\t *\n\t * @param {module:engine/view/position~Position} position Position to check.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/position~Position position} is contained in this range,\n\t * `false` otherwise.\n\t */\n\tcontainsPosition( position ) {\n\t\treturn position.isAfter( this.start ) && position.isBefore( this.end );\n\t}\n\n\t/**\n\t * Checks whether this range contains given {@link module:engine/view/range~Range range}.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check.\n\t * @param {Boolean} [loose=false] Whether the check is loose or strict. If the check is strict (`false`), compared range cannot\n\t * start or end at the same position as this range boundaries. If the check is loose (`true`), compared range can start, end or\n\t * even be equal to this range. Note that collapsed ranges are always compared in strict mode.\n\t * @returns {Boolean} `true` if given {@link module:engine/view/range~Range range} boundaries are contained by this range, `false`\n\t * otherwise.\n\t */\n\tcontainsRange( otherRange, loose = false ) {\n\t\tif ( otherRange.isCollapsed ) {\n\t\t\tloose = false;\n\t\t}\n\n\t\tconst containsStart = this.containsPosition( otherRange.start ) || ( loose && this.start.isEqual( otherRange.start ) );\n\t\tconst containsEnd = this.containsPosition( otherRange.end ) || ( loose && this.end.isEqual( otherRange.end ) );\n\n\t\treturn containsStart && containsEnd;\n\t}\n\n\t/**\n\t * Computes which part(s) of this {@link module:engine/view/range~Range range} is not a part of given\n\t * {@link module:engine/view/range~Range range}.\n\t * Returned array contains zero, one or two {@link module:engine/view/range~Range ranges}.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = new Text( 'foo' );\n\t *\t\tlet img = new ContainerElement( 'img' );\n\t *\t\tlet bar = new Text( 'bar' );\n\t *\t\tlet p = new ContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = new Range( new Position( foo, 2 ), new Position( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = new Range( new Position( foo, 1 ), new Position( bar, 2 ); \"oo\", img, \"ba\" are in range.\n\t *\t\tlet transformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has no ranges because `otherRange` contains `range`\n\t *\n\t *\t\totherRange = new Range( new Position( foo, 1 ), new Position( p, 2 ); // \"oo\", img are in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has one range: from ( p, 2 ) to ( bar, 1 )\n\t *\n\t *\t\totherRange = new Range( new Position( p, 1 ), new Position( p, 2 ) ); // img is in range.\n\t *\t\ttransformed = range.getDifference( otherRange );\n\t *\t\t// transformed array has two ranges: from ( foo, 1 ) to ( p, 1 ) and from ( p, 2 ) to ( bar, 1 )\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to differentiate against.\n\t * @returns {Array.<module:engine/view/range~Range>} The difference between ranges.\n\t */\n\tgetDifference( otherRange ) {\n\t\tconst ranges = [];\n\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect.\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the start to the middle of this range.\n\t\t\t\tranges.push( new Range( this.start, otherRange.start ) );\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// add shrunken range - from the middle of this range to the end.\n\t\t\t\tranges.push( new Range( otherRange.end, this.end ) );\n\t\t\t}\n\t\t} else {\n\t\t\t// Ranges do not intersect, return the original range.\n\t\t\tranges.push( Range.createFromRange( this ) );\n\t\t}\n\n\t\treturn ranges;\n\t}\n\n\t/**\n\t * Returns an intersection of this {@link module:engine/view/range~Range range} and given {@link module:engine/view/range~Range range}.\n\t * Intersection is a common part of both of those ranges. If ranges has no common part, returns `null`.\n\t *\n\t * Examples:\n\t *\n\t *\t\tlet foo = new Text( 'foo' );\n\t *\t\tlet img = new ContainerElement( 'img' );\n\t *\t\tlet bar = new Text( 'bar' );\n\t *\t\tlet p = new ContainerElement( 'p', null, [ foo, img, bar ] );\n\t *\n\t *\t\tlet range = new Range( new Position( foo, 2 ), new Position( bar, 1 ); // \"o\", img, \"b\" are in range.\n\t *\t\tlet otherRange = new Range( new Position( foo, 1 ), new Position( p, 2 ); // \"oo\", img are in range.\n\t *\t\tlet transformed = range.getIntersection( otherRange ); // range from ( foo, 1 ) to ( p, 2 ).\n\t *\n\t *\t\totherRange = new Range( new Position( bar, 1 ), new Position( bar, 3 ); \"ar\" is in range.\n\t *\t\ttransformed = range.getIntersection( otherRange ); // null - no common part.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to check for intersection.\n\t * @returns {module:engine/view/range~Range|null} A common part of given ranges or `null` if ranges have no common part.\n\t */\n\tgetIntersection( otherRange ) {\n\t\tif ( this.isIntersecting( otherRange ) ) {\n\t\t\t// Ranges intersect, so a common range will be returned.\n\t\t\t// At most, it will be same as this range.\n\t\t\tlet commonRangeStart = this.start;\n\t\t\tlet commonRangeEnd = this.end;\n\n\t\t\tif ( this.containsPosition( otherRange.start ) ) {\n\t\t\t\t// Given range start is inside this range. This means thaNt we have to\n\t\t\t\t// shrink common range to the given range start.\n\t\t\t\tcommonRangeStart = otherRange.start;\n\t\t\t}\n\n\t\t\tif ( this.containsPosition( otherRange.end ) ) {\n\t\t\t\t// Given range end is inside this range. This means that we have to\n\t\t\t\t// shrink common range to the given range end.\n\t\t\t\tcommonRangeEnd = otherRange.end;\n\t\t\t}\n\n\t\t\treturn new Range( commonRangeStart, commonRangeEnd );\n\t\t}\n\n\t\t// Ranges do not intersect, so they do not have common part.\n\t\treturn null;\n\t}\n\n\t/**\n\t * Creates a {@link module:engine/view/treewalker~TreeWalker TreeWalker} instance with this range as a boundary.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @param {module:engine/view/position~Position} [options.startPosition]\n\t * @param {Boolean} [options.singleCharacters=false]\n\t * @param {Boolean} [options.shallow=false]\n\t * @param {Boolean} [options.ignoreElementEnd=false]\n\t */\n\tgetWalker( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\treturn new TreeWalker( options );\n\t}\n\n\t/**\n\t * Returns a {@link module:engine/view/node~Node} or {@link module:engine/view/documentfragment~DocumentFragment}\n\t * which is a common ancestor of range's both ends (in which the entire range is contained).\n\t *\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null}\n\t */\n\tgetCommonAncestor() {\n\t\treturn this.start.getCommonAncestor( this.end );\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/item~Item view items} that are in this range and returns\n\t * them.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range and `ignoreElementEnd` option\n\t * set to `true`. However it returns only {@link module:engine/view/item~Item items},\n\t * not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/item~Item>}\n\t */\n\t* getItems( options = {} ) {\n\t\toptions.boundaries = this;\n\t\toptions.ignoreElementEnd = true;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.item;\n\t\t}\n\t}\n\n\t/**\n\t * Returns an iterator that iterates over all {@link module:engine/view/position~Position positions} that are boundaries or\n\t * contained in this range.\n\t *\n\t * This method uses {@link module:engine/view/treewalker~TreeWalker} with `boundaries` set to this range. However it returns only\n\t * {@link module:engine/view/position~Position positions}, not {@link module:engine/view/treewalker~TreeWalkerValue}.\n\t *\n\t * You may specify additional options for the tree walker. See {@link module:engine/view/treewalker~TreeWalker} for\n\t * a full list of available options.\n\t *\n\t * @param {Object} options Object with configuration options. See {@link module:engine/view/treewalker~TreeWalker}.\n\t * @returns {Iterable.<module:engine/view/position~Position>}\n\t */\n\t* getPositions( options = {} ) {\n\t\toptions.boundaries = this;\n\n\t\tconst treeWalker = new TreeWalker( options );\n\n\t\tyield treeWalker.position;\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tyield value.nextPosition;\n\t\t}\n\t}\n\n\t/**\n\t * Checks and returns whether this range intersects with given range.\n\t *\n\t * @param {module:engine/view/range~Range} otherRange Range to compare with.\n\t * @returns {Boolean} True if ranges intersect.\n\t */\n\tisIntersecting( otherRange ) {\n\t\treturn this.start.isBefore( otherRange.end ) && this.end.isAfter( otherRange.start );\n\t}\n\n\t/**\n\t * Creates a range from given parents and offsets.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} startElement Start position\n\t * parent element.\n\t * @param {Number} startOffset Start position offset.\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} endElement End position\n\t * parent element.\n\t * @param {Number} endOffset End position offset.\n\t * @returns {module:engine/view/range~Range} Created range.\n\t */\n\tstatic createFromParentsAndOffsets( startElement, startOffset, endElement, endOffset ) {\n\t\treturn new this(\n\t\t\tnew Position( startElement, startOffset ),\n\t\t\tnew Position( endElement, endOffset )\n\t\t);\n\t}\n\n\t/**\n\t * Creates and returns a new instance of Range which is equal to passed range.\n\t *\n\t * @param {module:engine/view/range~Range} range Range to clone.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createFromRange( range ) {\n\t\treturn new this( range.start, range.end );\n\t}\n\n\t/**\n\t * Creates a new range, spreading from specified {@link module:engine/view/position~Position position} to a position moved by\n\t * given `shift`. If `shift` is a negative value, shifted position is treated as the beginning of the range.\n\t *\n\t * @param {module:engine/view/position~Position} position Beginning of the range.\n\t * @param {Number} shift How long the range should be.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createFromPositionAndShift( position, shift ) {\n\t\tconst start = position;\n\t\tconst end = position.getShiftedBy( shift );\n\n\t\treturn shift > 0 ? new this( start, end ) : new this( end, start );\n\t}\n\n\t/**\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t * @param {module:engine/view/element~Element} element Element which is a parent for the range.\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createIn( element ) {\n\t\treturn this.createFromParentsAndOffsets( element, 0, element, element.childCount );\n\t}\n\n\t/**\n\t * Creates a range that starts before given {@link module:engine/view/item~Item view item} and ends after it.\n\t *\n\t * @param {module:engine/view/item~Item} item\n\t * @returns {module:engine/view/range~Range}\n\t */\n\tstatic createOn( item ) {\n\t\tconst size = item.is( 'textProxy' ) ? item.offsetSize : 1;\n\n\t\treturn this.createFromPositionAndShift( Position.createBefore( item ), size );\n\t}\n\n\t/**\n\t * Creates a collapsed range at given {@link module:engine/view/position~Position position}\n\t * or on the given {@link module:engine/view/item~Item item}.\n\t *\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tstatic createCollapsedAt( itemOrPosition, offset ) {\n\t\tconst start = Position.createAt( itemOrPosition, offset );\n\t\tconst end = Position.createFromPosition( start );\n\n\t\treturn new Range( start, end );\n\t}\n}\n\n// Function used by getEnlarged and getTrimmed methods.\nfunction enlargeTrimSkip( value ) {\n\tif ( value.item.is( 'attributeElement' ) || value.item.is( 'uiElement' ) ) {\n\t\treturn true;\n\t}\n\n\treturn false;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentselection\n */\n\nimport Selection from './selection';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * Class representing document selection in tree view. It's instance is stored at\n * {@link module:engine/view/document~Document#selection}. It is similar to {@link module:engine/view/selection~Selection} but\n * it has read-only API and can be modified only by writer obtained from {@link module:engine/view/view~View#change} method.\n *\n * Selection can consist of {@link module:engine/view/range~Range ranges}.\n * Selection's ranges can be obtained via {@link module:engine/view/documentselection~DocumentSelection#getRanges getRanges},\n * {@link module:engine/view/documentselection~DocumentSelection#getFirstRange getFirstRange}\n * and {@link module:engine/view/documentselection~DocumentSelection#getLastRange getLastRange}\n * methods, which return copies of ranges stored inside selection. Modifications made on these copies will not change\n * selection's state. Similar situation occurs when getting {@link module:engine/view/documentselection~DocumentSelection#anchor anchor},\n * {@link module:engine/view/documentselection~DocumentSelection#focus focus},\n * {@link module:engine/view/documentselection~DocumentSelection#getFirstPosition first} and\n * {@link module:engine/view/documentselection~DocumentSelection#getLastPosition last} positions - all will return\n * copies of requested positions.\n */\nexport default class DocumentSelection {\n\t/**\n\t * Creates new DocumentSelection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new DocumentSelection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tconst selection = new DocumentSelection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tconst selection = new DocumentSelection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tconst selection = new DocumentSelection( otherSelection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tconst selection = new DocumentSelection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new DocumentSelection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new DocumentSelection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new DocumentSelection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new DocumentSelection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Selection is used internally (`DocumentSelection` is a proxy to that selection).\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/selection~Selection}\n\t\t */\n\t\tthis._selection = new Selection();\n\n\t\t// Delegate change event to be fired on DocumentSelection instance.\n\t\tthis._selection.delegate( 'change' ).to( this );\n\n\t\t// Set selection data.\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #_setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._selection.isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #_setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._selection.fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\treturn this._selection.anchor;\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\treturn this._selection.focus;\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this._selection.isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._selection.rangeCount;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn this._selection.isBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\treturn this._selection.editableElement;\n\t}\n\n\t/**\n\t * Used for the compatibility with the {@link module:engine/view/selection~Selection#isEqual} method.\n\t *\n\t * @protected\n\t */\n\tget _ranges() {\n\t\treturn this._selection._ranges;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tyield* this._selection.getRanges();\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\treturn this._selection.getFirstRange();\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\treturn this._selection.getLastRange();\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\treturn this._selection.getFirstPosition();\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\treturn this._selection.getLastPosition();\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\treturn this._selection.getSelectedElement();\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\treturn this._selection.isEqual( otherSelection );\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\treturn this._selection.isSimilar( otherSelection );\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tdocumentSelection._setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tdocumentSelection._setTo( otherSelection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tdocumentSelection._setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tdocumentSelection._setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tdocumentSelection._setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tdocumentSelection._setTo( null );\n\t *\n\t * `Selection#_setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tdocumentSelection._setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to des cribe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tdocumentSelection._setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/position~Position|\n\t * Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\t_setTo( selectable, placeOrOffset, options ) {\n\t\tthis._selection.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/position~Position.createAt} parameters.\n\t *\n\t * @protected\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\t_setFocus( itemOrPosition, offset ) {\n\t\tthis._selection.setFocus( itemOrPosition, offset );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~DocumentSelection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( DocumentSelection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/selection\n */\n\nimport CKEditorError from '@ckeditor/ckeditor5-utils/src/ckeditorerror';\nimport Range from './range';\nimport Position from './position';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\nimport Node from './node';\nimport Element from './element';\nimport count from '@ckeditor/ckeditor5-utils/src/count';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport DocumentSelection from './documentselection';\n\n/**\n * Class representing selection in tree view.\n *\n * Selection can consist of {@link module:engine/view/range~Range ranges} that can be set using\n * {@link module:engine/view/selection~Selection#setTo setTo} method.\n * That method create copies of provided ranges and store those copies internally. Further modifications to passed\n * ranges will not change selection's state.\n * Selection's ranges can be obtained via {@link module:engine/view/selection~Selection#getRanges getRanges},\n * {@link module:engine/view/selection~Selection#getFirstRange getFirstRange} and\n * {@link module:engine/view/selection~Selection#getLastRange getLastRange} methods, which return copies of ranges\n * stored inside selection. Modifications made on these copies will not change selection's state. Similar situation\n * occurs when getting {@link module:engine/view/selection~Selection#anchor anchor},\n * {@link module:engine/view/selection~Selection#focus focus}, {@link module:engine/view/selection~Selection#getFirstPosition first}\n * and {@link module:engine/view/selection~Selection#getLastPosition last} positions - all will return\n * copies of requested positions.\n */\nexport default class Selection {\n\t/**\n\t * Creates new selection instance.\n\t *\n\t * \t\t// Creates empty selection without ranges.\n\t *\t\tconst selection = new Selection();\n\t *\n\t *\t\t// Creates selection at the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tconst selection = new Selection( range );\n\t *\n\t *\t\t// Creates selection at the given ranges\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tconst selection = new Selection( ranges );\n\t *\n\t *\t\t// Creates selection from the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tconst selection = new Selection( otherSelection );\n\t *\n\t *\t\t// Creates selection from the document selection.\n\t *\t\tconst selection = new Selection( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Creates selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tconst selection = new Selection( position );\n\t *\n\t *\t\t// Creates collapsed selection at the position of given item and offset.\n\t *\t\tconst paragraph = writer.createContainerElement( 'paragraph' );\n\t *\t\tconst selection = new Selection( paragraph, offset );\n\t *\n\t *\t\t// Creates a range inside an {@link module:engine/view/element~Element element} which starts before the\n\t *\t\t// first child of that element and ends after the last child of that element.\n\t *\t\tconst selection = new Selection( paragraph, 'in' );\n\t *\n\t *\t\t// Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends\n\t *\t\t// just after the item.\n\t *\t\tconst selection = new Selection( paragraph, 'on' );\n\t *\n\t * `Selection`'s constructor allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Creates backward selection.\n\t *\t\tconst selection = new Selection( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tconst selection = new Selection( range, { fake: true, label: 'foo' } );\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} [selectable=null]\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Offset or place when selectable is an `Item`.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tconstructor( selectable = null, placeOrOffset, options ) {\n\t\t/**\n\t\t * Stores all ranges that are selected.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/range~Range>}\n\t\t */\n\t\tthis._ranges = [];\n\n\t\t/**\n\t\t * Specifies whether the last added range was added as a backward or forward range.\n\t\t *\n\t\t * @protected\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._lastRangeBackward = false;\n\n\t\t/**\n\t\t * Specifies whether selection instance is fake.\n\t\t *\n\t\t * @private\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis._isFake = false;\n\n\t\t/**\n\t\t * Fake selection's label.\n\t\t *\n\t\t * @private\n\t\t * @member {String}\n\t\t */\n\t\tthis._fakeSelectionLabel = '';\n\n\t\tthis.setTo( selectable, placeOrOffset, options );\n\t}\n\n\t/**\n\t * Returns true if selection instance is marked as `fake`.\n\t *\n\t * @see #setTo\n\t * @returns {Boolean}\n\t */\n\tget isFake() {\n\t\treturn this._isFake;\n\t}\n\n\t/**\n\t * Returns fake selection label.\n\t *\n\t * @see #setTo\n\t * @returns {String}\n\t */\n\tget fakeSelectionLabel() {\n\t\treturn this._fakeSelectionLabel;\n\t}\n\n\t/**\n\t * Selection anchor. Anchor may be described as a position where the selection starts. Together with\n\t * {@link #focus focus} they define the direction of selection, which is important\n\t * when expanding/shrinking selection. Anchor is always the start or end of the most recent added range.\n\t * It may be a bit unintuitive when there are multiple ranges in selection.\n\t *\n\t * @see #focus\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget anchor() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst anchor = this._lastRangeBackward ? range.end : range.start;\n\n\t\treturn Position.createFromPosition( anchor );\n\t}\n\n\t/**\n\t * Selection focus. Focus is a position where the selection ends.\n\t *\n\t * @see #anchor\n\t * @type {module:engine/view/position~Position}\n\t */\n\tget focus() {\n\t\tif ( !this._ranges.length ) {\n\t\t\treturn null;\n\t\t}\n\t\tconst range = this._ranges[ this._ranges.length - 1 ];\n\t\tconst focus = this._lastRangeBackward ? range.start : range.end;\n\n\t\treturn Position.createFromPosition( focus );\n\t}\n\n\t/**\n\t * Returns whether the selection is collapsed. Selection is collapsed when there is exactly one range which is\n\t * collapsed.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isCollapsed() {\n\t\treturn this.rangeCount === 1 && this._ranges[ 0 ].isCollapsed;\n\t}\n\n\t/**\n\t * Returns number of ranges in selection.\n\t *\n\t * @type {Number}\n\t */\n\tget rangeCount() {\n\t\treturn this._ranges.length;\n\t}\n\n\t/**\n\t * Specifies whether the {@link #focus} precedes {@link #anchor}.\n\t *\n\t * @type {Boolean}\n\t */\n\tget isBackward() {\n\t\treturn !this.isCollapsed && this._lastRangeBackward;\n\t}\n\n\t/**\n\t * {@link module:engine/view/editableelement~EditableElement EditableElement} instance that contains this selection, or `null`\n\t * if the selection is not inside an editable element.\n\t *\n\t * @type {module:engine/view/editableelement~EditableElement|null}\n\t */\n\tget editableElement() {\n\t\tif ( this.anchor ) {\n\t\t\treturn this.anchor.editableElement;\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns an iterable that contains copies of all ranges added to the selection.\n\t *\n\t * @returns {Iterable.<module:engine/view/range~Range>}\n\t */\n\t* getRanges() {\n\t\tfor ( const range of this._ranges ) {\n\t\t\tyield Range.createFromRange( range );\n\t\t}\n\t}\n\n\t/**\n\t * Returns copy of the first range in the selection. First range is the one which\n\t * {@link module:engine/view/range~Range#start start} position {@link module:engine/view/position~Position#isBefore is before} start\n\t * position of all other ranges (not to confuse with the first range added to the selection).\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetFirstRange() {\n\t\tlet first = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !first || range.start.isBefore( first.start ) ) {\n\t\t\t\tfirst = range;\n\t\t\t}\n\t\t}\n\n\t\treturn first ? Range.createFromRange( first ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the last range in the selection. Last range is the one which {@link module:engine/view/range~Range#end end}\n\t * position {@link module:engine/view/position~Position#isAfter is after} end position of all other ranges (not to confuse\n\t * with the last range added to the selection). Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/range~Range|null}\n\t */\n\tgetLastRange() {\n\t\tlet last = null;\n\n\t\tfor ( const range of this._ranges ) {\n\t\t\tif ( !last || range.end.isAfter( last.end ) ) {\n\t\t\t\tlast = range;\n\t\t\t}\n\t\t}\n\n\t\treturn last ? Range.createFromRange( last ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the first position in the selection. First position is the position that\n\t * {@link module:engine/view/position~Position#isBefore is before} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetFirstPosition() {\n\t\tconst firstRange = this.getFirstRange();\n\n\t\treturn firstRange ? Position.createFromPosition( firstRange.start ) : null;\n\t}\n\n\t/**\n\t * Returns copy of the last position in the selection. Last position is the position that\n\t * {@link module:engine/view/position~Position#isAfter is after} any other position in the selection ranges.\n\t * Returns `null` if no ranges are added to selection.\n\t *\n\t * @returns {module:engine/view/position~Position|null}\n\t */\n\tgetLastPosition() {\n\t\tconst lastRange = this.getLastRange();\n\n\t\treturn lastRange ? Position.createFromPosition( lastRange.end ) : null;\n\t}\n\n\t/**\n\t * Checks whether, this selection is equal to given selection. Selections are equal if they have same directions,\n\t * same number of ranges and all ranges from one selection equal to a range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are equal, `false` otherwise.\n\t */\n\tisEqual( otherSelection ) {\n\t\tif ( this.isFake != otherSelection.isFake ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isFake && this.fakeSelectionLabel != otherSelection.fakeSelectionLabel ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.rangeCount != otherSelection.rangeCount ) {\n\t\t\treturn false;\n\t\t} else if ( this.rangeCount === 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\tif ( !this.anchor.isEqual( otherSelection.anchor ) || !this.focus.isEqual( otherSelection.focus ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tfor ( const thisRange of this._ranges ) {\n\t\t\tlet found = false;\n\n\t\t\tfor ( const otherRange of otherSelection._ranges ) {\n\t\t\t\tif ( thisRange.isEqual( otherRange ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Checks whether this selection is similar to given selection. Selections are similar if they have same directions, same\n\t * number of ranges, and all {@link module:engine/view/range~Range#getTrimmed trimmed} ranges from one selection are\n\t * equal to any trimmed range from other selection.\n\t *\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} otherSelection\n\t * Selection to compare with.\n\t * @returns {Boolean} `true` if selections are similar, `false` otherwise.\n\t */\n\tisSimilar( otherSelection ) {\n\t\tif ( this.isBackward != otherSelection.isBackward ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst numOfRangesA = count( this.getRanges() );\n\t\tconst numOfRangesB = count( otherSelection.getRanges() );\n\n\t\t// If selections have different number of ranges, they cannot be similar.\n\t\tif ( numOfRangesA != numOfRangesB ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// If both selections have no ranges, they are similar.\n\t\tif ( numOfRangesA == 0 ) {\n\t\t\treturn true;\n\t\t}\n\n\t\t// Check if each range in one selection has a similar range in other selection.\n\t\tfor ( let rangeA of this.getRanges() ) {\n\t\t\trangeA = rangeA.getTrimmed();\n\n\t\t\tlet found = false;\n\n\t\t\tfor ( let rangeB of otherSelection.getRanges() ) {\n\t\t\t\trangeB = rangeB.getTrimmed();\n\n\t\t\t\tif ( rangeA.start.isEqual( rangeB.start ) && rangeA.end.isEqual( rangeB.end ) ) {\n\t\t\t\t\tfound = true;\n\t\t\t\t\tbreak;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// For `rangeA`, neither range in `otherSelection` was similar. So selections are not similar.\n\t\t\tif ( !found ) {\n\t\t\t\treturn false;\n\t\t\t}\n\t\t}\n\n\t\t// There were no ranges that weren't matched. Selections are similar.\n\t\treturn true;\n\t}\n\n\t/**\n\t * Returns the selected element. {@link module:engine/view/element~Element Element} is considered as selected if there is only\n\t * one range in the selection, and that range contains exactly one element.\n\t * Returns `null` if there is no selected element.\n\t *\n\t * @returns {module:engine/view/element~Element|null}\n\t */\n\tgetSelectedElement() {\n\t\tif ( this.rangeCount !== 1 ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst range = this.getFirstRange();\n\t\tconst nodeAfterStart = range.start.nodeAfter;\n\t\tconst nodeBeforeEnd = range.end.nodeBefore;\n\n\t\treturn ( nodeAfterStart instanceof Element && nodeAfterStart == nodeBeforeEnd ) ? nodeAfterStart : null;\n\t}\n\n\t/**\n\t * Sets this selection's ranges and direction to the specified location based on the given\n\t * {@link module:engine/view/documentselection~DocumentSelection document selection},\n\t * {@link module:engine/view/selection~Selection selection}, {@link module:engine/view/position~Position position},\n\t * {@link module:engine/view/item~Item item}, {@link module:engine/view/range~Range range},\n\t * an iterable of {@link module:engine/view/range~Range ranges} or null.\n\t *\n\t *\t\t// Sets selection to the given range.\n\t *\t\tconst range = new Range( start, end );\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to given ranges.\n\t * \t\tconst ranges = [ new Range( start1, end2 ), new Range( star2, end2 ) ];\n\t *\t\tselection.setTo( range );\n\t *\n\t *\t\t// Sets selection to the other selection.\n\t *\t\tconst otherSelection = new Selection();\n\t *\t\tselection.setTo( otherSelection );\n\t *\n\t *\t \t// Sets selection to contents of DocumentSelection.\n\t *\t\tselection.setTo( editor.editing.view.document.selection );\n\t *\n\t * \t\t// Sets collapsed selection at the given position.\n\t *\t\tconst position = new Position( root, path );\n\t *\t\tselection.setTo( position );\n\t *\n\t * \t\t// Sets collapsed selection at the position of given item and offset.\n\t *\t\tselection.setTo( paragraph, offset );\n\t *\n\t * Creates a range inside an {@link module:engine/view/element~Element element} which starts before the first child of\n\t * that element and ends after the last child of that element.\n\t *\n\t *\t\tselection.setTo( paragraph, 'in' );\n\t *\n\t * Creates a range on an {@link module:engine/view/item~Item item} which starts before the item and ends just after the item.\n\t *\n\t *\t\tselection.setTo( paragraph, 'on' );\n\t *\n\t * \t\t// Clears selection. Removes all ranges.\n\t *\t\tselection.setTo( null );\n\t *\n\t * `Selection#setTo()` method allow passing additional options (`backward`, `fake` and `label`) as the last argument.\n\t *\n\t *\t\t// Sets selection as backward.\n\t *\t\tselection.setTo( range, { backward: true } );\n\t *\n\t * Fake selection does not render as browser native selection over selected elements and is hidden to the user.\n\t * This way, no native selection UI artifacts are displayed to the user and selection over elements can be\n\t * represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM\n\t * (and be  properly handled by screen readers).\n\t *\n\t *\t\t// Creates fake selection with label.\n\t *\t\tselection.setTo( range, { fake: true, label: 'foo' } );\n\t *\n\t * @fires change\n\t * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection|\n\t * module:engine/view/position~Position|Iterable.<module:engine/view/range~Range>|module:engine/view/range~Range|\n\t * module:engine/view/item~Item|null} selectable\n\t * @param {Number|'before'|'end'|'after'|'on'|'in'} [placeOrOffset] Sets place or offset of the selection.\n\t * @param {Object} [options]\n\t * @param {Boolean} [options.backward] Sets this selection instance to be backward.\n\t * @param {Boolean} [options.fake] Sets this selection instance to be marked as `fake`.\n\t * @param {String} [options.label] Label for the fake selection.\n\t */\n\tsetTo( selectable, placeOrOffset, options ) {\n\t\tif ( selectable === null ) {\n\t\t\tthis._setRanges( [] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Selection || selectable instanceof DocumentSelection ) {\n\t\t\tthis._setRanges( selectable.getRanges(), selectable.isBackward );\n\t\t\tthis._setFakeOptions( { fake: selectable.isFake, label: selectable.fakeSelectionLabel } );\n\t\t} else if ( selectable instanceof Range ) {\n\t\t\tthis._setRanges( [ selectable ], placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Position ) {\n\t\t\tthis._setRanges( [ new Range( selectable ) ] );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else if ( selectable instanceof Node ) {\n\t\t\tconst backward = !!options && !!options.backward;\n\t\t\tlet range;\n\n\t\t\tif ( placeOrOffset === undefined ) {\n\t\t\t\t/**\n\t\t\t\t * selection.setTo requires the second parameter when the first parameter is a node.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-setTo-required-second-parameter\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-setTo-required-second-parameter: ' +\n\t\t\t\t\t'selection.setTo requires the second parameter when the first parameter is a node.'\n\t\t\t\t);\n\t\t\t} else if ( placeOrOffset == 'in' ) {\n\t\t\t\trange = Range.createIn( selectable );\n\t\t\t} else if ( placeOrOffset == 'on' ) {\n\t\t\t\trange = Range.createOn( selectable );\n\t\t\t} else {\n\t\t\t\trange = Range.createCollapsedAt( selectable, placeOrOffset );\n\t\t\t}\n\n\t\t\tthis._setRanges( [ range ], backward );\n\t\t\tthis._setFakeOptions( options );\n\t\t} else if ( isIterable( selectable ) ) {\n\t\t\t// We assume that the selectable is an iterable of ranges.\n\t\t\t// Array.from() is used to prevent setting ranges to the old iterable\n\t\t\tthis._setRanges( selectable, placeOrOffset && placeOrOffset.backward );\n\t\t\tthis._setFakeOptions( placeOrOffset );\n\t\t} else {\n\t\t\t/**\n\t\t\t * Cannot set selection to given place.\n\t\t\t *\n\t\t\t * @error view-selection-setTo-not-selectable\n\t\t\t */\n\t\t\tthrow new CKEditorError( 'view-selection-setTo-not-selectable: Cannot set selection to given place.' );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Moves {@link #focus} to the specified location.\n\t *\n\t * The location can be specified in the same form as {@link module:engine/view/position~Position.createAt} parameters.\n\t *\n\t * @fires change\n\t * @param {module:engine/view/item~Item|module:engine/view/position~Position} itemOrPosition\n\t * @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags. Used only when\n\t * first parameter is a {@link module:engine/view/item~Item view item}.\n\t */\n\tsetFocus( itemOrPosition, offset ) {\n\t\tif ( this.anchor === null ) {\n\t\t\t/**\n\t\t\t * Cannot set selection focus if there are no ranges in selection.\n\t\t\t *\n\t\t\t * @error view-selection-setFocus-no-ranges\n\t\t\t */\n\t\t\tthrow new CKEditorError(\n\t\t\t\t'view-selection-setFocus-no-ranges: Cannot set selection focus if there are no ranges in selection.'\n\t\t\t);\n\t\t}\n\n\t\tconst newFocus = Position.createAt( itemOrPosition, offset );\n\n\t\tif ( newFocus.compareWith( this.focus ) == 'same' ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst anchor = this.anchor;\n\n\t\tthis._ranges.pop();\n\n\t\tif ( newFocus.compareWith( anchor ) == 'before' ) {\n\t\t\tthis._addRange( new Range( newFocus, anchor ), true );\n\t\t} else {\n\t\t\tthis._addRange( new Range( anchor, newFocus ) );\n\t\t}\n\n\t\tthis.fire( 'change' );\n\t}\n\n\t/**\n\t * Replaces all ranges that were added to the selection with given array of ranges. Last range of the array\n\t * is treated like the last added range and is used to set {@link #anchor anchor} and {@link #focus focus}.\n\t * Accepts a flag describing in which way the selection is made.\n\t *\n\t * @private\n\t * @param {Iterable.<module:engine/view/range~Range>} newRanges Iterable object of ranges to set.\n\t * @param {Boolean} [isLastBackward=false] Flag describing if last added range was selected forward - from start to end\n\t * (`false`) or backward - from end to start (`true`). Defaults to `false`.\n\t */\n\t_setRanges( newRanges, isLastBackward = false ) {\n\t\t// New ranges should be copied to prevent removing them by setting them to `[]` first.\n\t\t// Only applies to situations when selection is set to the same selection or same selection's ranges.\n\t\tnewRanges = Array.from( newRanges );\n\n\t\tthis._ranges = [];\n\n\t\tfor ( const range of newRanges ) {\n\t\t\tthis._addRange( range );\n\t\t}\n\n\t\tthis._lastRangeBackward = !!isLastBackward;\n\t}\n\n\t/**\n\t * Sets this selection instance to be marked as `fake`. A fake selection does not render as browser native selection\n\t * over selected elements and is hidden to the user. This way, no native selection UI artifacts are displayed to\n\t * the user and selection over elements can be represented in other way, for example by applying proper CSS class.\n\t *\n\t * Additionally fake's selection label can be provided. It will be used to describe fake selection in DOM (and be\n\t * properly handled by screen readers).\n\t *\n\t * @private\n\t * @param {Object} [options] Options.\n\t * @param {Boolean} [options.fake] If set to true selection will be marked as `fake`.\n\t * @param {String} [options.label=''] Fake selection label.\n\t */\n\t_setFakeOptions( options = {} ) {\n\t\tthis._isFake = !!options.fake;\n\t\tthis._fakeSelectionLabel = options.fake ? options.label || '' : '';\n\t}\n\n\t/**\n\t * Adds a range to the selection. Added range is copied. This means that passed range is not saved in the\n\t * selection instance and you can safely operate on it.\n\t *\n\t * Accepts a flag describing in which way the selection is made - passed range might be selected from\n\t * {@link module:engine/view/range~Range#start start} to {@link module:engine/view/range~Range#end end}\n\t * or from {@link module:engine/view/range~Range#end end} to {@link module:engine/view/range~Range#start start}.\n\t * The flag is used to set {@link #anchor anchor} and {@link #focus focus} properties.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in Selection instance.\n\t *\n\t * @private\n\t * @fires change\n\t * @param {module:engine/view/range~Range} range\n\t * @param {Boolean} [isBackward]\n\t */\n\t_addRange( range, isBackward = false ) {\n\t\tif ( !( range instanceof Range ) ) {\n\t\t\tthrow new CKEditorError( 'view-selection-invalid-range: Invalid Range.' );\n\t\t}\n\n\t\tthis._pushRange( range );\n\t\tthis._lastRangeBackward = !!isBackward;\n\t}\n\n\t/**\n\t * Adds range to selection - creates copy of given range so it can be safely used and modified.\n\t *\n\t * Throws {@link module:utils/ckeditorerror~CKEditorError CKEditorError} `view-selection-range-intersects` if added range intersects\n\t * with ranges already stored in selection instance.\n\t *\n\t * @private\n\t * @param {module:engine/view/range~Range} range\n\t */\n\t_pushRange( range ) {\n\t\tfor ( const storedRange of this._ranges ) {\n\t\t\tif ( range.isIntersecting( storedRange ) ) {\n\t\t\t\t/**\n\t\t\t\t * Trying to add a range that intersects with another range from selection.\n\t\t\t\t *\n\t\t\t\t * @error view-selection-range-intersects\n\t\t\t\t * @param {module:engine/view/range~Range} addedRange Range that was added to the selection.\n\t\t\t\t * @param {module:engine/view/range~Range} intersectingRange Range from selection that intersects with `addedRange`.\n\t\t\t\t */\n\t\t\t\tthrow new CKEditorError(\n\t\t\t\t\t'view-selection-range-intersects: Trying to add a range that intersects with another range from selection.',\n\t\t\t\t\t{ addedRange: range, intersectingRange: storedRange }\n\t\t\t\t);\n\t\t\t}\n\t\t}\n\n\t\tthis._ranges.push( Range.createFromRange( range ) );\n\t}\n\n\t/**\n\t * Fired whenever selection ranges are changed through {@link ~Selection Selection API}.\n\t *\n\t * @event change\n\t */\n}\n\nmix( Selection, EmitterMixin );\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/documentfragment\n */\n\nimport Text from './text';\nimport TextProxy from './textproxy';\nimport mix from '@ckeditor/ckeditor5-utils/src/mix';\nimport isIterable from '@ckeditor/ckeditor5-utils/src/isiterable';\nimport EmitterMixin from '@ckeditor/ckeditor5-utils/src/emittermixin';\n\n/**\n * DocumentFragment class.\n */\nexport default class DocumentFragment {\n\t/**\n\t * Creates new DocumentFragment instance.\n\t *\n\t * @protected\n\t * @param {module:engine/view/node~Node|Iterable.<module:engine/view/node~Node>} [children] List of nodes to be inserted into\n\t * created document fragment.\n\t */\n\tconstructor( children ) {\n\t\t/**\n\t\t * Array of child nodes.\n\t\t *\n\t\t * @protected\n\t\t * @member {Array.<module:engine/view/element~Element>} module:engine/view/documentfragment~DocumentFragment#_children\n\t\t */\n\t\tthis._children = [];\n\n\t\tif ( children ) {\n\t\t\tthis._insertChild( 0, children );\n\t\t}\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * Iterates over nodes added to this document fragment.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Number of child nodes in this document fragment.\n\t *\n\t * @readonly\n\t * @type {Number}\n\t */\n\tget childCount() {\n\t\treturn this._children.length;\n\t}\n\n\t/**\n\t * Is `true` if there are no nodes inside this document fragment, `false` otherwise.\n\t *\n\t * @readonly\n\t * @type {Boolean}\n\t */\n\tget isEmpty() {\n\t\treturn this.childCount === 0;\n\t}\n\n\t/**\n\t * Artificial root of `DocumentFragment`. Returns itself. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {module:engine/model/documentfragment~DocumentFragment}\n\t */\n\tget root() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Artificial parent of `DocumentFragment`. Returns `null`. Added for compatibility reasons.\n\t *\n\t * @readonly\n\t * @type {null}\n\t */\n\tget parent() {\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks whether given view tree object is of given type.\n\t *\n\t * Read more in {@link module:engine/view/node~Node#is}.\n\t *\n\t * @param {String} type\n\t * @returns {Boolean}\n\t */\n\tis( type ) {\n\t\treturn type == 'documentFragment';\n\t}\n\n\t/**\n\t * {@link module:engine/view/documentfragment~DocumentFragment#_insertChild Insert} a child node or a list of child nodes at the end\n\t * and sets the parent of these nodes to this fragment.\n\t *\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of appended nodes.\n\t */\n\t_appendChild( items ) {\n\t\treturn this._insertChild( this.childCount, items );\n\t}\n\n\t/**\n\t * Gets child at the given index.\n\t *\n\t * @param {Number} index Index of child.\n\t * @returns {module:engine/view/node~Node} Child node.\n\t */\n\tgetChild( index ) {\n\t\treturn this._children[ index ];\n\t}\n\n\t/**\n\t * Gets index of the given child node. Returns `-1` if child node is not found.\n\t *\n\t * @param {module:engine/view/node~Node} node Child node.\n\t * @returns {Number} Index of the child node.\n\t */\n\tgetChildIndex( node ) {\n\t\treturn this._children.indexOf( node );\n\t}\n\n\t/**\n\t * Gets child nodes iterator.\n\t *\n\t * @returns {Iterable.<module:engine/view/node~Node>} Child nodes iterator.\n\t */\n\tgetChildren() {\n\t\treturn this._children[ Symbol.iterator ]();\n\t}\n\n\t/**\n\t * Inserts a child node or a list of child nodes on the given index and sets the parent of these nodes to\n\t * this fragment.\n\t *\n\t * @param {Number} index Position where nodes should be inserted.\n\t * @param {module:engine/view/item~Item|Iterable.<module:engine/view/item~Item>} items Items to be inserted.\n\t * @returns {Number} Number of inserted nodes.\n\t */\n\t_insertChild( index, items ) {\n\t\tthis._fireChange( 'children', this );\n\t\tlet count = 0;\n\n\t\tconst nodes = normalize( items );\n\n\t\tfor ( const node of nodes ) {\n\t\t\t// If node that is being added to this element is already inside another element, first remove it from the old parent.\n\t\t\tif ( node.parent !== null ) {\n\t\t\t\tnode._remove();\n\t\t\t}\n\n\t\t\tnode.parent = this;\n\n\t\t\tthis._children.splice( index, 0, node );\n\t\t\tindex++;\n\t\t\tcount++;\n\t\t}\n\n\t\treturn count;\n\t}\n\n\t/**\n\t * Removes number of child nodes starting at the given index and set the parent of these nodes to `null`.\n\t *\n\t * @param {Number} index Number of the first node to remove.\n\t * @param {Number} [howMany=1] Number of nodes to remove.\n\t * @returns {Array.<module:engine/view/node~Node>} The array of removed nodes.\n\t */\n\t_removeChildren( index, howMany = 1 ) {\n\t\tthis._fireChange( 'children', this );\n\n\t\tfor ( let i = index; i < index + howMany; i++ ) {\n\t\t\tthis._children[ i ].parent = null;\n\t\t}\n\n\t\treturn this._children.splice( index, howMany );\n\t}\n\n\t/**\n\t * Fires `change` event with given type of the change.\n\t *\n\t * @private\n\t * @param {module:engine/view/document~ChangeType} type Type of the change.\n\t * @param {module:engine/view/node~Node} node Changed node.\n\t * @fires module:engine/view/node~Node#change\n\t */\n\t_fireChange( type, node ) {\n\t\tthis.fire( 'change:' + type, node );\n\t}\n}\n\nmix( DocumentFragment, EmitterMixin );\n\n// Converts strings to Text and non-iterables to arrays.\n//\n// @param {String|module:engine/view/item~Item|Iterable.<String|module:engine/view/item~Item>}\n// @return {Iterable.<module:engine/view/node~Node>}\nfunction normalize( nodes ) {\n\t// Separate condition because string is iterable.\n\tif ( typeof nodes == 'string' ) {\n\t\treturn [ new Text( nodes ) ];\n\t}\n\n\tif ( !isIterable( nodes ) ) {\n\t\tnodes = [ nodes ];\n\t}\n\n\t// Array.from to enable .map() on non-arrays.\n\treturn Array.from( nodes )\n\t\t.map( node => {\n\t\t\tif ( typeof node == 'string' ) {\n\t\t\t\treturn new Text( node );\n\t\t\t}\n\n\t\t\tif ( node instanceof TextProxy ) {\n\t\t\t\treturn new Text( node.data );\n\t\t\t}\n\n\t\t\treturn node;\n\t\t} );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/* globals window, Text */\n\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\n/**\n * Set of utils related to block and inline fillers handling.\n *\n * Browsers do not allow to put caret in elements which does not have height. Because of it, we need to fill all\n * empty elements which should be selectable with elements or characters called \"fillers\". Unfortunately there is no one\n * universal filler, this is why two types are uses:\n *\n * * Block filler is an element which fill block elements, like `<p>`. CKEditor uses `<br>` as a block filler during the editing,\n * as browsers do natively. So instead of an empty `<p>` there will be `<p><br></p>`. The advantage of block filler is that\n * it is transparent for the selection, so when the caret is before the `<br>` and user presses right arrow he will be\n * moved to the next paragraph, not after the `<br>`. The disadvantage is that it breaks a block, so it can not be used\n * in the middle of a line of text. The {@link module:engine/view/filler~BR_FILLER `<br>` filler} can be replaced with any other\n * character in the data output, for instance {@link module:engine/view/filler~NBSP_FILLER non-breaking space}.\n *\n * * Inline filler is a filler which does not break a line of text, so it can be used inside the text, for instance in the empty\n * `<b>` surrendered by text: `foo<b></b>bar`, if we want to put the caret there. CKEditor uses a sequence of the zero-width\n * spaces as an {@link module:engine/view/filler~INLINE_FILLER inline filler} having the predetermined\n * {@link module:engine/view/filler~INLINE_FILLER_LENGTH length}. A sequence is used, instead of a single character to\n * avoid treating random zero-width spaces as the inline filler. Disadvantage of the inline filler is that it is not\n * transparent for the selection. The arrow key moves the caret between zero-width spaces characters, so the additional\n * code is needed to handle the caret.\n *\n * Both inline and block fillers are handled by the {@link module:engine/view/renderer~Renderer renderer} and are not present in the\n * view.\n *\n * @module engine/view/filler\n */\n\n/**\n * `<br> filler creator. This is a function which creates `<br data-cke-filler=\"true\">` element.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~NBSP_FILLER\n * @function\n */\nexport const BR_FILLER = domDocument => {\n\tconst fillerBr = domDocument.createElement( 'br' );\n\tfillerBr.dataset.ckeFiller = true;\n\n\treturn fillerBr;\n};\n\n/**\n * Non-breaking space filler creator. This is a function which creates `&nbsp;` text node.\n * It defines how the filler is created.\n *\n * @see module:engine/view/filler~BR_FILLER\n * @function\n */\nexport const NBSP_FILLER = domDocument => domDocument.createTextNode( '\\u00A0' );\n\n/**\n * Length of the {@link module:engine/view/filler~INLINE_FILLER INLINE_FILLER}.\n */\nexport const INLINE_FILLER_LENGTH = 7;\n\n/**\n * Inline filler which is sequence of the zero width spaces.\n */\nexport let INLINE_FILLER = '';\n\nfor ( let i = 0; i < INLINE_FILLER_LENGTH; i++ ) {\n\tINLINE_FILLER += '\\u200b';\n}\n\n/**\n * Checks if the node is a text node which starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // true\n *\t\tstartsWithFiller( document.createTextNode( 'foo' ) ); // false\n *\t\tstartsWithFiller( document.createElement( 'p' ) ); // false\n *\n * @param {Node} domNode DOM node.\n * @returns {Boolean} True if the text node starts with the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function startsWithFiller( domNode ) {\n\treturn ( domNode instanceof Text ) && ( domNode.data.substr( 0, INLINE_FILLER_LENGTH ) === INLINE_FILLER );\n}\n\n/**\n * Checks if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n *\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER ) ); // true\n *\t\tisInlineFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ); // false\n *\n * @param {Text} domText DOM text node.\n * @returns {Boolean} True if the text node contains only the {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isInlineFiller( domText ) {\n\treturn domText.data.length == INLINE_FILLER_LENGTH && startsWithFiller( domText );\n}\n\n/**\n * Get string data from the text node, removing an {@link module:engine/view/filler~INLINE_FILLER inline filler} from it,\n * if text node contains it.\n *\n *\t\tgetDataWithoutFiller( document.createTextNode( INLINE_FILLER + 'foo' ) ) == 'foo' // true\n *\t\tgetDataWithoutFiller( document.createTextNode( 'foo' ) ) == 'foo' // true\n *\n * @param {Text} domText DOM text node, possible with inline filler.\n * @returns {String} Data without filler.\n */\nexport function getDataWithoutFiller( domText ) {\n\tif ( startsWithFiller( domText ) ) {\n\t\treturn domText.data.slice( INLINE_FILLER_LENGTH );\n\t} else {\n\t\treturn domText.data;\n\t}\n}\n\n// Cache block fillers templates to improve performance.\nconst templateBlockFillers = new WeakMap();\n\n/**\n * Checks if the node is an instance of the block filler of the given type.\n *\n *\t\tconst brFillerInstance = BR_FILLER( document );\n *\t\tisBlockFiller( brFillerInstance, BR_FILLER ); // true\n *\n * @param {Node} domNode DOM node to check.\n * @param {Function} blockFiller Block filler creator.\n * @returns {Boolean} True if text node contains only {@link module:engine/view/filler~INLINE_FILLER inline filler}.\n */\nexport function isBlockFiller( domNode, blockFiller ) {\n\tlet templateBlockFiller = templateBlockFillers.get( blockFiller );\n\n\tif ( !templateBlockFiller ) {\n\t\ttemplateBlockFiller = blockFiller( window.document );\n\t\ttemplateBlockFillers.set( blockFiller, templateBlockFiller );\n\t}\n\n\treturn domNode.isEqualNode( templateBlockFiller );\n}\n\n/**\n * Assign key observer which move cursor from the end of the inline filler to the beginning of it when\n * the left arrow is pressed, so the filler does not break navigation.\n *\n * @param {module:engine/view/view~View} view View controller instance we should inject quirks handling on.\n */\nexport function injectQuirksHandling( view ) {\n\tview.document.on( 'keydown', jumpOverInlineFiller );\n}\n\n// Move cursor from the end of the inline filler to the beginning of it when, so the filler does not break navigation.\nfunction jumpOverInlineFiller( evt, data ) {\n\tif ( data.keyCode == keyCodes.arrowleft ) {\n\t\tconst domSelection = data.domTarget.ownerDocument.defaultView.getSelection();\n\n\t\tif ( domSelection.rangeCount == 1 && domSelection.getRangeAt( 0 ).collapsed ) {\n\t\t\tconst domParent = domSelection.getRangeAt( 0 ).startContainer;\n\t\t\tconst domOffset = domSelection.getRangeAt( 0 ).startOffset;\n\n\t\t\tif ( startsWithFiller( domParent ) && domOffset <= INLINE_FILLER_LENGTH ) {\n\t\t\t\tdomSelection.collapse( domParent, 0 );\n\t\t\t}\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/view/domconverter\n */\n\n/* globals document, Node, NodeFilter, Text */\n\nimport ViewText from './text';\nimport ViewElement from './element';\nimport ViewPosition from './position';\nimport ViewRange from './range';\nimport ViewSelection from './selection';\nimport ViewDocumentFragment from './documentfragment';\nimport ViewTreeWalker from './treewalker';\nimport { BR_FILLER, INLINE_FILLER_LENGTH, isBlockFiller, isInlineFiller, startsWithFiller, getDataWithoutFiller } from './filler';\n\nimport global from '@ckeditor/ckeditor5-utils/src/dom/global';\nimport indexOf from '@ckeditor/ckeditor5-utils/src/dom/indexof';\nimport getAncestors from '@ckeditor/ckeditor5-utils/src/dom/getancestors';\nimport getCommonAncestor from '@ckeditor/ckeditor5-utils/src/dom/getcommonancestor';\nimport isText from '@ckeditor/ckeditor5-utils/src/dom/istext';\n\n/**\n * DomConverter is a set of tools to do transformations between DOM nodes and view nodes. It also handles\n * {@link module:engine/view/domconverter~DomConverter#bindElements binding} these nodes.\n *\n * DomConverter does not check which nodes should be rendered (use {@link module:engine/view/renderer~Renderer}), does not keep a\n * state of a tree nor keeps synchronization between tree view and DOM tree (use {@link module:engine/view/document~Document}).\n *\n * DomConverter keeps DOM elements to View element bindings, so when the converter will be destroyed, the binding will\n * be lost. Two converters will keep separate binding maps, so one tree view can be bound with two DOM trees.\n */\nexport default class DomConverter {\n\t/**\n\t * Creates DOM converter.\n\t *\n\t * @param {Object} options Object with configuration options.\n\t * @param {Function} [options.blockFiller=module:engine/view/filler~BR_FILLER] Block filler creator.\n\t */\n\tconstructor( options = {} ) {\n\t\t// Using WeakMap prevent memory leaks: when the converter will be destroyed all referenced between View and DOM\n\t\t// will be removed. Also because it is a *Weak*Map when both view and DOM elements will be removed referenced\n\t\t// will be also removed, isn't it brilliant?\n\t\t//\n\t\t// Yes, PJ. It is.\n\t\t//\n\t\t// You guys so smart.\n\t\t//\n\t\t// I've been here. Seen stuff. Afraid of code now.\n\n\t\t/**\n\t\t * Block {@link module:engine/view/filler filler} creator, which is used to create all block fillers during the\n\t\t * view to DOM conversion and to recognize block fillers during the DOM to view conversion.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Function} module:engine/view/domconverter~DomConverter#blockFiller\n\t\t */\n\t\tthis.blockFiller = options.blockFiller || BR_FILLER;\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered pre-formatted elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#preElements\n\t\t */\n\t\tthis.preElements = [ 'pre' ];\n\n\t\t/**\n\t\t * Tag names of DOM `Element`s which are considered block elements.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Array.<String>} module:engine/view/domconverter~DomConverter#blockElements\n\t\t */\n\t\tthis.blockElements = [ 'p', 'div', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6' ];\n\n\t\t/**\n\t\t * DOM to View mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_domToViewMapping\n\t\t */\n\t\tthis._domToViewMapping = new WeakMap();\n\n\t\t/**\n\t\t * View to DOM mapping.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_viewToDomMapping\n\t\t */\n\t\tthis._viewToDomMapping = new WeakMap();\n\n\t\t/**\n\t\t * Holds mapping between fake selection containers and corresponding view selections.\n\t\t *\n\t\t * @private\n\t\t * @member {WeakMap} module:engine/view/domconverter~DomConverter#_fakeSelectionMapping\n\t\t */\n\t\tthis._fakeSelectionMapping = new WeakMap();\n\t}\n\n\t/**\n\t * Binds given DOM element that represents fake selection to {@link module:engine/view/documentselection~DocumentSelection\n\t * document selection}. Document selection copy is stored and can be retrieved by\n\t * {@link module:engine/view/domconverter~DomConverter#fakeSelectionToView} method.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @param {module:engine/view/documentselection~DocumentSelection} viewDocumentSelection\n\t */\n\tbindFakeSelection( domElement, viewDocumentSelection ) {\n\t\tthis._fakeSelectionMapping.set( domElement, new ViewSelection( viewDocumentSelection ) );\n\t}\n\n\t/**\n\t * Returns {@link module:engine/view/selection~Selection view selection} instance corresponding to\n\t * given DOM element that represents fake selection. Returns `undefined` if binding to given DOM element does not exists.\n\t *\n\t * @param {HTMLElement} domElement\n\t * @returns {module:engine/view/selection~Selection|undefined}\n\t */\n\tfakeSelectionToView( domElement ) {\n\t\treturn this._fakeSelectionMapping.get( domElement );\n\t}\n\n\t/**\n\t * Binds DOM and View elements, so it will be possible to get corresponding elements using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {HTMLElement} domElement DOM element to bind.\n\t * @param {module:engine/view/element~Element} viewElement View element to bind.\n\t */\n\tbindElements( domElement, viewElement ) {\n\t\tthis._domToViewMapping.set( domElement, viewElement );\n\t\tthis._viewToDomMapping.set( viewElement, domElement );\n\t}\n\n\t/**\n\t * Unbinds given `domElement` from the view element it was bound to. Unbinding is deep, meaning that all children of\n\t * `domElement` will be unbound too.\n\t *\n\t * @param {HTMLElement} domElement DOM element to unbind.\n\t */\n\tunbindDomElement( domElement ) {\n\t\tconst viewElement = this._domToViewMapping.get( domElement );\n\n\t\tif ( viewElement ) {\n\t\t\tthis._domToViewMapping.delete( domElement );\n\t\t\tthis._viewToDomMapping.delete( viewElement );\n\n\t\t\t// Use Array.from because of MS Edge (#923).\n\t\t\tfor ( const child of Array.from( domElement.childNodes ) ) {\n\t\t\t\tthis.unbindDomElement( child );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Binds DOM and View document fragments, so it will be possible to get corresponding document fragments using\n\t * {@link module:engine/view/domconverter~DomConverter#mapDomToView} and\n\t * {@link module:engine/view/domconverter~DomConverter#mapViewToDom}.\n\t *\n\t * @param {DocumentFragment} domFragment DOM document fragment to bind.\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment View document fragment to bind.\n\t */\n\tbindDocumentFragments( domFragment, viewFragment ) {\n\t\tthis._domToViewMapping.set( domFragment, viewFragment );\n\t\tthis._viewToDomMapping.set( viewFragment, domFragment );\n\t}\n\n\t/**\n\t * Converts view to DOM. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items.\n\t *\n\t * @param {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View node or document fragment to transform.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @returns {Node|DocumentFragment} Converted node or DocumentFragment.\n\t */\n\tviewToDom( viewNode, domDocument, options = {} ) {\n\t\tif ( viewNode.is( 'text' ) ) {\n\t\t\tconst textData = this._processDataFromViewText( viewNode );\n\n\t\t\treturn domDocument.createTextNode( textData );\n\t\t} else {\n\t\t\tif ( this.mapViewToDom( viewNode ) ) {\n\t\t\t\treturn this.mapViewToDom( viewNode );\n\t\t\t}\n\n\t\t\tlet domElement;\n\n\t\t\tif ( viewNode.is( 'documentFragment' ) ) {\n\t\t\t\t// Create DOM document fragment.\n\t\t\t\tdomElement = domDocument.createDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domElement, viewNode );\n\t\t\t\t}\n\t\t\t} else if ( viewNode.is( 'uiElement' ) ) {\n\t\t\t\t// UIElement has its own render() method (see #799).\n\t\t\t\tdomElement = viewNode.render( domDocument );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\treturn domElement;\n\t\t\t} else {\n\t\t\t\t// Create DOM element.\n\t\t\t\tdomElement = domDocument.createElement( viewNode.name );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domElement, viewNode );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tfor ( const key of viewNode.getAttributeKeys() ) {\n\t\t\t\t\tdomElement.setAttribute( key, viewNode.getAttribute( key ) );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.viewChildrenToDom( viewNode, domDocument, options ) ) {\n\t\t\t\t\tdomElement.appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn domElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the view element to DOM using the\n\t * {@link module:engine/view/domconverter~DomConverter#viewToDom} method.\n\t * Additionally, this method adds block {@link module:engine/view/filler filler} to the list of children, if needed.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewElement Parent view element.\n\t * @param {Document} domDocument Document which will be used to create DOM nodes.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#viewToDom} options parameter.\n\t * @returns {Iterable.<Node>} DOM nodes.\n\t */\n\t* viewChildrenToDom( viewElement, domDocument, options = {} ) {\n\t\tconst fillerPositionOffset = viewElement.getFillerOffset && viewElement.getFillerOffset();\n\t\tlet offset = 0;\n\n\t\tfor ( const childView of viewElement.getChildren() ) {\n\t\t\tif ( fillerPositionOffset === offset ) {\n\t\t\t\tyield this.blockFiller( domDocument );\n\t\t\t}\n\n\t\t\tyield this.viewToDom( childView, domDocument, options );\n\n\t\t\toffset++;\n\t\t}\n\n\t\tif ( fillerPositionOffset === offset ) {\n\t\t\tyield this.blockFiller( domDocument );\n\t\t}\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/range~Range} to DOM range.\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t *\n\t * @param {module:engine/view/range~Range} viewRange View range.\n\t * @returns {Range} DOM range.\n\t */\n\tviewRangeToDom( viewRange ) {\n\t\tconst domStart = this.viewPositionToDom( viewRange.start );\n\t\tconst domEnd = this.viewPositionToDom( viewRange.end );\n\n\t\tconst domRange = document.createRange();\n\t\tdomRange.setStart( domStart.parent, domStart.offset );\n\t\tdomRange.setEnd( domEnd.parent, domEnd.offset );\n\n\t\treturn domRange;\n\t}\n\n\t/**\n\t * Converts view {@link module:engine/view/position~Position} to DOM parent and offset.\n\t *\n\t * Inline and block {@link module:engine/view/filler fillers} are handled during the conversion.\n\t * If the converted position is directly before inline filler it is moved inside the filler.\n\t *\n\t * @param {module:engine/view/position~Position} viewPosition View position.\n\t * @returns {Object|null} position DOM position or `null` if view position could not be converted to DOM.\n\t * @returns {Node} position.parent DOM position parent.\n\t * @returns {Number} position.offset DOM position offset.\n\t */\n\tviewPositionToDom( viewPosition ) {\n\t\tconst viewParent = viewPosition.parent;\n\n\t\tif ( viewParent.is( 'text' ) ) {\n\t\t\tconst domParent = this.findCorrespondingDomText( viewParent );\n\n\t\t\tif ( !domParent ) {\n\t\t\t\t// Position is in a view text node that has not been rendered to DOM yet.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tlet offset = viewPosition.offset;\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset += INLINE_FILLER_LENGTH;\n\t\t\t}\n\n\t\t\treturn { parent: domParent, offset };\n\t\t} else {\n\t\t\t// viewParent is instance of ViewElement.\n\t\t\tlet domParent, domBefore, domAfter;\n\n\t\t\tif ( viewPosition.offset === 0 ) {\n\t\t\t\tdomParent = this.mapViewToDom( viewParent );\n\n\t\t\t\tif ( !domParent ) {\n\t\t\t\t\t// Position is in a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomAfter = domParent.childNodes[ 0 ];\n\t\t\t} else {\n\t\t\t\tconst nodeBefore = viewPosition.nodeBefore;\n\n\t\t\t\tdomBefore = nodeBefore.is( 'text' ) ?\n\t\t\t\t\tthis.findCorrespondingDomText( nodeBefore ) :\n\t\t\t\t\tthis.mapViewToDom( viewPosition.nodeBefore );\n\n\t\t\t\tif ( !domBefore ) {\n\t\t\t\t\t// Position is after a view element that has not been rendered to DOM yet.\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\n\t\t\t\tdomParent = domBefore.parentNode;\n\t\t\t\tdomAfter = domBefore.nextSibling;\n\t\t\t}\n\n\t\t\t// If there is an inline filler at position return position inside the filler. We should never return\n\t\t\t// the position before the inline filler.\n\t\t\tif ( isText( domAfter ) && startsWithFiller( domAfter ) ) {\n\t\t\t\treturn { parent: domAfter, offset: INLINE_FILLER_LENGTH };\n\t\t\t}\n\n\t\t\tconst offset = domBefore ? indexOf( domBefore ) + 1 : 0;\n\n\t\t\treturn { parent: domParent, offset };\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM to view. For all text nodes, not bound elements and document fragments new items will\n\t * be created. For bound elements and document fragments function will return corresponding items. For\n\t * {@link module:engine/view/filler fillers} `null` will be returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {Node|DocumentFragment} domNode DOM node or document fragment to transform.\n\t * @param {Object} [options] Conversion options.\n\t * @param {Boolean} [options.bind=false] Determines whether new elements will be bound.\n\t * @param {Boolean} [options.withChildren=true] If `true`, node's and document fragment's children will be converted too.\n\t * @param {Boolean} [options.keepOriginalCase=false] If `false`, node's tag name will be converter to lower case.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} Converted node or document fragment\n\t * or `null` if DOM node is a {@link module:engine/view/filler filler} or the given node is an empty text node.\n\t */\n\tdomToView( domNode, options = {} ) {\n\t\tif ( isBlockFiller( domNode, this.blockFiller ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// When node is inside UIElement return that UIElement as it's view representation.\n\t\tconst uiElement = this.getParentUIElement( domNode, this._domToViewMapping );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tif ( isText( domNode ) ) {\n\t\t\tif ( isInlineFiller( domNode ) ) {\n\t\t\t\treturn null;\n\t\t\t} else {\n\t\t\t\tconst textData = this._processDataFromDomText( domNode );\n\n\t\t\t\treturn textData === '' ? null : new ViewText( textData );\n\t\t\t}\n\t\t} else if ( this.isComment( domNode ) ) {\n\t\t\treturn null;\n\t\t} else {\n\t\t\tif ( this.mapDomToView( domNode ) ) {\n\t\t\t\treturn this.mapDomToView( domNode );\n\t\t\t}\n\n\t\t\tlet viewElement;\n\n\t\t\tif ( this.isDocumentFragment( domNode ) ) {\n\t\t\t\t// Create view document fragment.\n\t\t\t\tviewElement = new ViewDocumentFragment();\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindDocumentFragments( domNode, viewElement );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\t// Create view element.\n\t\t\t\tconst viewName = options.keepOriginalCase ? domNode.tagName : domNode.tagName.toLowerCase();\n\t\t\t\tviewElement = new ViewElement( viewName );\n\n\t\t\t\tif ( options.bind ) {\n\t\t\t\t\tthis.bindElements( domNode, viewElement );\n\t\t\t\t}\n\n\t\t\t\t// Copy element's attributes.\n\t\t\t\tconst attrs = domNode.attributes;\n\n\t\t\t\tfor ( let i = attrs.length - 1; i >= 0; i-- ) {\n\t\t\t\t\tviewElement._setAttribute( attrs[ i ].name, attrs[ i ].value );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tif ( options.withChildren || options.withChildren === undefined ) {\n\t\t\t\tfor ( const child of this.domChildrenToView( domNode, options ) ) {\n\t\t\t\t\tviewElement._appendChild( child );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn viewElement;\n\t\t}\n\t}\n\n\t/**\n\t * Converts children of the DOM element to view nodes using\n\t * the {@link module:engine/view/domconverter~DomConverter#domToView} method.\n\t * Additionally this method omits block {@link module:engine/view/filler filler}, if it exists in the DOM parent.\n\t *\n\t * @param {HTMLElement} domElement Parent DOM element.\n\t * @param {Object} options See {@link module:engine/view/domconverter~DomConverter#domToView} options parameter.\n\t * @returns {Iterable.<module:engine/view/node~Node>} View nodes.\n\t */\n\t* domChildrenToView( domElement, options = {} ) {\n\t\tfor ( let i = 0; i < domElement.childNodes.length; i++ ) {\n\t\t\tconst domChild = domElement.childNodes[ i ];\n\t\t\tconst viewChild = this.domToView( domChild, options );\n\n\t\t\tif ( viewChild !== null ) {\n\t\t\t\tyield viewChild;\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Converts DOM selection to view {@link module:engine/view/selection~Selection}.\n\t * Ranges which cannot be converted will be omitted.\n\t *\n\t * @param {Selection} domSelection DOM selection.\n\t * @returns {module:engine/view/selection~Selection} View selection.\n\t */\n\tdomSelectionToView( domSelection ) {\n\t\t// DOM selection might be placed in fake selection container.\n\t\t// If container contains fake selection - return corresponding view selection.\n\t\tif ( domSelection.rangeCount === 1 ) {\n\t\t\tlet container = domSelection.getRangeAt( 0 ).startContainer;\n\n\t\t\t// The DOM selection might be moved to the text node inside the fake selection container.\n\t\t\tif ( isText( container ) ) {\n\t\t\t\tcontainer = container.parentNode;\n\t\t\t}\n\n\t\t\tconst viewSelection = this.fakeSelectionToView( container );\n\n\t\t\tif ( viewSelection ) {\n\t\t\t\treturn viewSelection;\n\t\t\t}\n\t\t}\n\n\t\tconst isBackward = this.isDomSelectionBackward( domSelection );\n\n\t\tconst viewRanges = [];\n\n\t\tfor ( let i = 0; i < domSelection.rangeCount; i++ ) {\n\t\t\t// DOM Range have correct start and end, no matter what is the DOM Selection direction. So we don't have to fix anything.\n\t\t\tconst domRange = domSelection.getRangeAt( i );\n\t\t\tconst viewRange = this.domRangeToView( domRange );\n\n\t\t\tif ( viewRange ) {\n\t\t\t\tviewRanges.push( viewRange );\n\t\t\t}\n\t\t}\n\n\t\treturn new ViewSelection( viewRanges, { backward: isBackward } );\n\t}\n\n\t/**\n\t * Converts DOM Range to view {@link module:engine/view/range~Range}.\n\t * If the start or end position can not be converted `null` is returned.\n\t *\n\t * @param {Range} domRange DOM range.\n\t * @returns {module:engine/view/range~Range|null} View range.\n\t */\n\tdomRangeToView( domRange ) {\n\t\tconst viewStart = this.domPositionToView( domRange.startContainer, domRange.startOffset );\n\t\tconst viewEnd = this.domPositionToView( domRange.endContainer, domRange.endOffset );\n\n\t\tif ( viewStart && viewEnd ) {\n\t\t\treturn new ViewRange( viewStart, viewEnd );\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Converts DOM parent and offset to view {@link module:engine/view/position~Position}.\n\t *\n\t * If the position is inside a {@link module:engine/view/filler filler} which has no corresponding view node,\n\t * position of the filler will be converted and returned.\n\t *\n\t * If the position is inside DOM element rendered by {@link module:engine/view/uielement~UIElement}\n\t * that position will be converted to view position before that UIElement.\n\t *\n\t * If structures are too different and it is not possible to find corresponding position then `null` will be returned.\n\t *\n\t * @param {Node} domParent DOM position parent.\n\t * @param {Number} domOffset DOM position offset.\n\t * @returns {module:engine/view/position~Position} viewPosition View position.\n\t */\n\tdomPositionToView( domParent, domOffset ) {\n\t\tif ( isBlockFiller( domParent, this.blockFiller ) ) {\n\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t}\n\n\t\t// If position is somewhere inside UIElement - return position before that element.\n\t\tconst viewElement = this.mapDomToView( domParent );\n\n\t\tif ( viewElement && viewElement.is( 'uiElement' ) ) {\n\t\t\treturn ViewPosition.createBefore( viewElement );\n\t\t}\n\n\t\tif ( isText( domParent ) ) {\n\t\t\tif ( isInlineFiller( domParent ) ) {\n\t\t\t\treturn this.domPositionToView( domParent.parentNode, indexOf( domParent ) );\n\t\t\t}\n\n\t\t\tconst viewParent = this.findCorrespondingViewText( domParent );\n\t\t\tlet offset = domOffset;\n\n\t\t\tif ( !viewParent ) {\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tif ( startsWithFiller( domParent ) ) {\n\t\t\t\toffset -= INLINE_FILLER_LENGTH;\n\t\t\t\toffset = offset < 0 ? 0 : offset;\n\t\t\t}\n\n\t\t\treturn new ViewPosition( viewParent, offset );\n\t\t}\n\t\t// domParent instanceof HTMLElement.\n\t\telse {\n\t\t\tif ( domOffset === 0 ) {\n\t\t\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t\t\tif ( viewParent ) {\n\t\t\t\t\treturn new ViewPosition( viewParent, 0 );\n\t\t\t\t}\n\t\t\t} else {\n\t\t\t\tconst domBefore = domParent.childNodes[ domOffset - 1 ];\n\t\t\t\tconst viewBefore = isText( domBefore ) ?\n\t\t\t\t\tthis.findCorrespondingViewText( domBefore ) :\n\t\t\t\t\tthis.mapDomToView( domBefore );\n\n\t\t\t\t// TODO #663\n\t\t\t\tif ( viewBefore && viewBefore.parent ) {\n\t\t\t\t\treturn new ViewPosition( viewBefore.parent, viewBefore.index + 1 );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\treturn null;\n\t\t}\n\t}\n\n\t/**\n\t * Returns corresponding view {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment} for provided DOM element or\n\t * document fragment. If there is no view item {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * to the given DOM - `undefined` is returned.\n\t * For all DOM elements rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * @param {DocumentFragment|Element} domElementOrDocumentFragment DOM element or document fragment.\n\t * @returns {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment|undefined}\n\t * Corresponding view element, document fragment or `undefined` if no element was bound.\n\t */\n\tmapDomToView( domElementOrDocumentFragment ) {\n\t\treturn this.getParentUIElement( domElementOrDocumentFragment ) || this._domToViewMapping.get( domElementOrDocumentFragment );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * For all text nodes rendered by {@link module:engine/view/uielement~UIElement} that UIElement will be returned.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * Note that for the block or inline {@link module:engine/view/filler filler} this method returns `null`.\n\t *\n\t * @param {Text} domText DOM text node.\n\t * @returns {module:engine/view/text~Text|null} Corresponding view text node or `null`, if it was not possible to find a\n\t * corresponding node.\n\t */\n\tfindCorrespondingViewText( domText ) {\n\t\tif ( isInlineFiller( domText ) ) {\n\t\t\treturn null;\n\t\t}\n\n\t\t// If DOM text was rendered by UIElement - return that element.\n\t\tconst uiElement = this.getParentUIElement( domText );\n\n\t\tif ( uiElement ) {\n\t\t\treturn uiElement;\n\t\t}\n\n\t\tconst previousSibling = domText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling ) {\n\t\t\tif ( !( this.isElement( previousSibling ) ) ) {\n\t\t\t\t// The previous is text or comment.\n\t\t\t\treturn null;\n\t\t\t}\n\n\t\t\tconst viewElement = this.mapDomToView( previousSibling );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst nextSibling = viewElement.nextSibling;\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( nextSibling instanceof ViewText ) {\n\t\t\t\t\treturn viewElement.nextSibling;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t\t// Try to use parent to find the corresponding text node.\n\t\telse {\n\t\t\tconst viewElement = this.mapDomToView( domText.parentNode );\n\n\t\t\tif ( viewElement ) {\n\t\t\t\tconst firstChild = viewElement.getChild( 0 );\n\n\t\t\t\t// It might be filler which has no corresponding view node.\n\t\t\t\tif ( firstChild instanceof ViewText ) {\n\t\t\t\t\treturn firstChild;\n\t\t\t\t} else {\n\t\t\t\t\treturn null;\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Returns corresponding DOM item for provided {@link module:engine/view/element~Element Element} or\n\t * {@link module:engine/view/documentfragment~DocumentFragment DocumentFragment}.\n\t * To find a corresponding text for {@link module:engine/view/text~Text view Text instance}\n\t * use {@link #findCorrespondingDomText}.\n\t *\n\t * @param {module:engine/view/element~Element|module:engine/view/documentfragment~DocumentFragment} viewNode\n\t * View element or document fragment.\n\t * @returns {Node|DocumentFragment|undefined} Corresponding DOM node or document fragment.\n\t */\n\tmapViewToDom( documentFragmentOrElement ) {\n\t\treturn this._viewToDomMapping.get( documentFragmentOrElement );\n\t}\n\n\t/**\n\t * Finds corresponding text node. Text nodes are not {@link module:engine/view/domconverter~DomConverter#bindElements bound},\n\t * corresponding text node is returned based on the sibling or parent.\n\t *\n\t * If the directly previous sibling is a {@link module:engine/view/domconverter~DomConverter#bindElements bound} element, it is used\n\t * to find the corresponding text node.\n\t *\n\t * If this is a first child in the parent and the parent is a {@link module:engine/view/domconverter~DomConverter#bindElements bound}\n\t * element, it is used to find the corresponding text node.\n\t *\n\t * Otherwise `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} viewText View text node.\n\t * @returns {Text|null} Corresponding DOM text node or `null`, if it was not possible to find a corresponding node.\n\t */\n\tfindCorrespondingDomText( viewText ) {\n\t\tconst previousSibling = viewText.previousSibling;\n\n\t\t// Try to use previous sibling to find the corresponding text node.\n\t\tif ( previousSibling && this.mapViewToDom( previousSibling ) ) {\n\t\t\treturn this.mapViewToDom( previousSibling ).nextSibling;\n\t\t}\n\n\t\t// If this is a first node, try to use parent to find the corresponding text node.\n\t\tif ( !previousSibling && viewText.parent && this.mapViewToDom( viewText.parent ) ) {\n\t\t\treturn this.mapViewToDom( viewText.parent ).childNodes[ 0 ];\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Focuses DOM editable that is corresponding to provided {@link module:engine/view/editableelement~EditableElement}.\n\t *\n\t * @param {module:engine/view/editableelement~EditableElement} viewEditable\n\t */\n\tfocus( viewEditable ) {\n\t\tconst domEditable = this.mapViewToDom( viewEditable );\n\n\t\tif ( domEditable && domEditable.ownerDocument.activeElement !== domEditable ) {\n\t\t\t// Save the scrollX and scrollY positions before the focus.\n\t\t\tconst { scrollX, scrollY } = global.window;\n\t\t\tconst scrollPositions = [];\n\n\t\t\t// Save all scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst { scrollLeft, scrollTop } = node;\n\n\t\t\t\tscrollPositions.push( [ scrollLeft, scrollTop ] );\n\t\t\t} );\n\n\t\t\tdomEditable.focus();\n\n\t\t\t// Restore scrollLeft and scrollTop values starting from domEditable up to\n\t\t\t// document#documentElement.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/957\n\t\t\tforEachDomNodeAncestor( domEditable, node => {\n\t\t\t\tconst [ scrollLeft, scrollTop ] = scrollPositions.shift();\n\n\t\t\t\tnode.scrollLeft = scrollLeft;\n\t\t\t\tnode.scrollTop = scrollTop;\n\t\t\t} );\n\n\t\t\t// Restore the scrollX and scrollY positions after the focus.\n\t\t\t// https://github.com/ckeditor/ckeditor5-engine/issues/951\n\t\t\tglobal.window.scrollTo( scrollX, scrollY );\n\t\t}\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.ELEMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisElement( node ) {\n\t\treturn node && node.nodeType == Node.ELEMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.DOCUMENT_FRAGMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisDocumentFragment( node ) {\n\t\treturn node && node.nodeType == Node.DOCUMENT_FRAGMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` when `node.nodeType` equals `Node.COMMENT_NODE`.\n\t *\n\t * @param {Node} node Node to check.\n\t * @returns {Boolean}\n\t */\n\tisComment( node ) {\n\t\treturn node && node.nodeType == Node.COMMENT_NODE;\n\t}\n\n\t/**\n\t * Returns `true` if given selection is a backward selection, that is, if it's `focus` is before `anchor`.\n\t *\n\t * @param {Selection} DOM Selection instance to check.\n\t * @returns {Boolean}\n\t */\n\tisDomSelectionBackward( selection ) {\n\t\tif ( selection.isCollapsed ) {\n\t\t\treturn false;\n\t\t}\n\n\t\t// Since it takes multiple lines of code to check whether a \"DOM Position\" is before/after another \"DOM Position\",\n\t\t// we will use the fact that range will collapse if it's end is before it's start.\n\t\tconst range = document.createRange();\n\n\t\trange.setStart( selection.anchorNode, selection.anchorOffset );\n\t\trange.setEnd( selection.focusNode, selection.focusOffset );\n\n\t\tconst backward = range.collapsed;\n\n\t\trange.detach();\n\n\t\treturn backward;\n\t}\n\n\t/**\n\t * Returns parent {@link module:engine/view/uielement~UIElement} for provided DOM node. Returns `null` if there is no\n\t * parent UIElement.\n\t *\n\t * @param {Node} domNode\n\t * @return {module:engine/view/uielement~UIElement|null}\n\t */\n\tgetParentUIElement( domNode ) {\n\t\tconst ancestors = getAncestors( domNode );\n\n\t\t// Remove domNode from the list.\n\t\tancestors.pop();\n\n\t\twhile ( ancestors.length ) {\n\t\t\tconst domNode = ancestors.pop();\n\t\t\tconst viewNode = this._domToViewMapping.get( domNode );\n\n\t\t\tif ( viewNode && viewNode.is( 'uiElement' ) ) {\n\t\t\t\treturn viewNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Checks if given selection's boundaries are at correct places.\n\t *\n\t * The following places are considered as incorrect for selection boundaries:\n\t * * before or in the middle of the inline filler sequence,\n\t * * inside the DOM element which represents {@link module:engine/view/uielement~UIElement a view ui element}.\n\t *\n\t * @param {Selection} domSelection DOM Selection object to be checked.\n\t * @returns {Boolean} `true` if the given selection is at a correct place, `false` otherwise.\n\t */\n\tisDomSelectionCorrect( domSelection ) {\n\t\treturn this._isDomSelectionPositionCorrect( domSelection.anchorNode, domSelection.anchorOffset ) &&\n\t\t\tthis._isDomSelectionPositionCorrect( domSelection.focusNode, domSelection.focusOffset );\n\t}\n\n\t/**\n\t * Checks if the given DOM position is a correct place for selection boundary. See {@link #isDomSelectionCorrect}.\n\t *\n\t * @private\n\t * @param {Element} domParent Position parent.\n\t * @param {Number} offset Position offset.\n\t * @returns {Boolean} `true` if given position is at a correct place for selection boundary, `false` otherwise.\n\t */\n\t_isDomSelectionPositionCorrect( domParent, offset ) {\n\t\t// If selection is before or in the middle of inline filler string, it is incorrect.\n\t\tif ( isText( domParent ) && startsWithFiller( domParent ) && offset < INLINE_FILLER_LENGTH ) {\n\t\t\t// Selection in a text node, at wrong position (before or in the middle of filler).\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( this.isElement( domParent ) && startsWithFiller( domParent.childNodes[ offset ] ) ) {\n\t\t\t// Selection in an element node, before filler text node.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst viewParent = this.mapDomToView( domParent );\n\n\t\t// If selection is in `view.UIElement`, it is incorrect. Note that `mapDomToView()` returns `view.UIElement`\n\t\t// also for any dom element that is inside the view ui element (so we don't need to perform any additional checks).\n\t\tif ( viewParent && viewParent.is( 'uiElement' ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\treturn true;\n\t}\n\n\t/**\n\t * Takes text data from a given {@link module:engine/view/text~Text#data} and processes it so\n\t * it is correctly displayed in the DOM.\n\t *\n\t * Following changes are done:\n\t *\n\t * * a space at the beginning is changed to `&nbsp;` if this is the first text node in its container\n\t * element or if a previous text node ends with a space character,\n\t * * space at the end of the text node is changed to `&nbsp;` if this is the last text node in its container,\n\t * * remaining spaces are replaced to a chain of spaces and `&nbsp;` (e.g. `'x   x'` becomes `'x &nbsp; x'`).\n\t *\n\t * Content of {@link #preElements} is not processed.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node View text node to process.\n\t * @returns {String} Processed text data.\n\t */\n\t_processDataFromViewText( node ) {\n\t\tlet data = node.data;\n\n\t\t// If any of node ancestors has a name which is in `preElements` array, then currently processed\n\t\t// view text node is (will be) in preformatted element. We should not change whitespaces then.\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn data;\n\t\t}\n\n\t\t// 1. Replace the first space with a nbsp if the previous node ends with a space or there is no previous node\n\t\t// (container element boundary).\n\t\tif ( data.charAt( 0 ) == ' ' ) {\n\t\t\tconst prevNode = this._getTouchingViewTextNode( node, false );\n\t\t\tconst prevEndsWithSpace = prevNode && this._nodeEndsWithSpace( prevNode );\n\n\t\t\tif ( prevEndsWithSpace || !prevNode ) {\n\t\t\t\tdata = '\\u00A0' + data.substr( 1 );\n\t\t\t}\n\t\t}\n\n\t\t// 2. Replace the last space with a nbsp if this is the last text node (container element boundary).\n\t\tif ( data.charAt( data.length - 1 ) == ' ' ) {\n\t\t\tconst nextNode = this._getTouchingViewTextNode( node, true );\n\n\t\t\tif ( !nextNode ) {\n\t\t\t\tdata = data.substr( 0, data.length - 1 ) + '\\u00A0';\n\t\t\t}\n\t\t}\n\n\t\treturn data.replace( / {2}/g, ' \\u00A0' );\n\t}\n\n\t/**\n\t * Checks whether given node ends with a space character after changing appropriate space characters to `&nbsp;`s.\n\t *\n\t * @private\n\t * @param {module:engine/view/text~Text} node Node to check.\n\t * @returns {Boolean} `true` if given `node` ends with space, `false` otherwise.\n\t */\n\t_nodeEndsWithSpace( node ) {\n\t\tif ( node.getAncestors().some( parent => this.preElements.includes( parent.name ) ) ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tconst data = this._processDataFromViewText( node );\n\n\t\treturn data.charAt( data.length - 1 ) == ' ';\n\t}\n\n\t/**\n\t * Takes text data from native `Text` node and processes it to a correct {@link module:engine/view/text~Text view text node} data.\n\t *\n\t * Following changes are done:\n\t * * multiple whitespaces are replaced to a single space,\n\t * * space at the beginning of the text node is removed, if it is a first text node in it's container\n\t * element or if previous text node ends by space character,\n\t * * space at the end of the text node is removed, if it is a last text node in it's container.\n\t *\n\t * @param {Node} node DOM text node to process.\n\t * @returns {String} Processed data.\n\t * @private\n\t */\n\t_processDataFromDomText( node ) {\n\t\tlet data = node.data;\n\n\t\tif ( _hasDomParentOfType( node, this.preElements ) ) {\n\t\t\treturn getDataWithoutFiller( node );\n\t\t}\n\n\t\t// Change all consecutive whitespace characters (from the [ \\n\\t\\r] set –\n\t\t// see https://github.com/ckeditor/ckeditor5-engine/issues/822#issuecomment-311670249) to a single space character.\n\t\t// That's how multiple whitespaces are treated when rendered, so we normalize those whitespaces.\n\t\t// We're replacing 1+ (and not 2+) to also normalize singular \\n\\t\\r characters (#822).\n\t\tdata = data.replace( /[ \\n\\t\\r]{1,}/g, ' ' );\n\n\t\tconst prevNode = this._getTouchingDomTextNode( node, false );\n\t\tconst nextNode = this._getTouchingDomTextNode( node, true );\n\n\t\t// If previous dom text node does not exist or it ends by whitespace character, remove space character from the beginning\n\t\t// of this text node. Such space character is treated as a whitespace.\n\t\tif ( !prevNode || /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) ) ) {\n\t\t\tdata = data.replace( /^ /, '' );\n\t\t}\n\n\t\t// If next text node does not exist remove space character from the end of this text node.\n\t\tif ( !nextNode && !startsWithFiller( node ) ) {\n\t\t\tdata = data.replace( / $/, '' );\n\t\t}\n\n\t\t// At the beginning and end of a block element, Firefox inserts normal space + <br> instead of non-breaking space.\n\t\t// This means that the text node starts/end with normal space instead of non-breaking space.\n\t\t// This causes a problem because the normal space would be removed in `.replace` calls above. To prevent that,\n\t\t// the inline filler is removed only after the data is initially processed (by the `.replace` above). See ckeditor5#692.\n\t\tdata = getDataWithoutFiller( new Text( data ) );\n\n\t\t// At this point we should have removed all whitespaces from DOM text data.\n\n\t\t// Now we have to change &nbsp; chars, that were in DOM text data because of rendering reasons, to spaces.\n\t\t// First, change all ` \\u00A0` pairs (space + &nbsp;) to two spaces. DOM converter changes two spaces from model/view as\n\t\t// ` \\u00A0` to ensure proper rendering. Since here we convert back, we recognize those pairs and change them\n\t\t// to `  ` which is what we expect to have in model/view.\n\t\tdata = data.replace( / \\u00A0/g, '  ' );\n\n\t\t// Then, change &nbsp; character that is at the beginning of the text node to space character.\n\t\t// As above, that &nbsp; was created for rendering reasons but it's real meaning is just a space character.\n\t\t// We do that replacement only if this is the first node or the previous node ends on whitespace character.\n\t\tif ( !prevNode || /[^\\S\\u00A0]/.test( prevNode.data.charAt( prevNode.data.length - 1 ) ) ) {\n\t\t\tdata = data.replace( /^\\u00A0/, ' ' );\n\t\t}\n\n\t\t// Since input text data could be: `x_ _`, we would not replace the first &nbsp; after `x` character.\n\t\t// We have to fix it. Since we already change all ` &nbsp;`, we will have something like this at the end of text data:\n\t\t// `x_ _ _` -> `x_    `. Find &nbsp; at the end of string (can be followed only by spaces).\n\t\t// We do that replacement only if this is the last node or the next node starts by &nbsp;.\n\t\tif ( !nextNode || nextNode.data.charAt( 0 ) == '\\u00A0' ) {\n\t\t\tdata = data.replace( /\\u00A0( *)$/, ' $1' );\n\t\t}\n\n\t\t// At this point, all whitespaces should be removed and all &nbsp; created for rendering reasons should be\n\t\t// changed to normal space. All left &nbsp; are &nbsp; inserted intentionally.\n\t\treturn data;\n\t}\n\n\t/**\n\t * Helper function. For given {@link module:engine/view/text~Text view text node}, it finds previous or next sibling\n\t * that is contained in the same container element. If there is no such sibling, `null` is returned.\n\t *\n\t * @param {module:engine/view/text~Text} node Reference node.\n\t * @param {Boolean} getNext\n\t * @returns {module:engine/view/text~Text|null} Touching text node or `null` if there is no next or previous touching text node.\n\t */\n\t_getTouchingViewTextNode( node, getNext ) {\n\t\tconst treeWalker = new ViewTreeWalker( {\n\t\t\tstartPosition: getNext ? ViewPosition.createAfter( node ) : ViewPosition.createBefore( node ),\n\t\t\tdirection: getNext ? 'forward' : 'backward'\n\t\t} );\n\n\t\tfor ( const value of treeWalker ) {\n\t\t\tif ( value.item.is( 'containerElement' ) ) {\n\t\t\t\t// ViewContainerElement is found on a way to next ViewText node, so given `node` was first/last\n\t\t\t\t// text node in its container element.\n\t\t\t\treturn null;\n\t\t\t} else if ( value.item.is( 'textProxy' ) ) {\n\t\t\t\t// Found a text node in the same container element.\n\t\t\t\treturn value.item;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n\n\t/**\n\t * Helper function. For given `Text` node, it finds previous or next sibling that is contained in the same block element.\n\t * If there is no such sibling, `null` is returned.\n\t *\n\t * @private\n\t * @param {Text} node\n\t * @param {Boolean} getNext\n\t * @returns {Text|null}\n\t */\n\t_getTouchingDomTextNode( node, getNext ) {\n\t\tif ( !node.parentNode ) {\n\t\t\treturn null;\n\t\t}\n\n\t\tconst direction = getNext ? 'nextNode' : 'previousNode';\n\t\tconst document = node.ownerDocument;\n\t\tconst topmostParent = getAncestors( node )[ 0 ];\n\n\t\tconst treeWalker = document.createTreeWalker( topmostParent, NodeFilter.SHOW_TEXT );\n\n\t\ttreeWalker.currentNode = node;\n\n\t\tconst touchingNode = treeWalker[ direction ]();\n\n\t\tif ( touchingNode !== null ) {\n\t\t\tconst lca = getCommonAncestor( node, touchingNode );\n\n\t\t\t// If there is common ancestor between the text node and next/prev text node,\n\t\t\t// and there are no block elements on a way from the text node to that ancestor,\n\t\t\t// and there are no block elements on a way from next/prev text node to that ancestor...\n\t\t\tif (\n\t\t\t\tlca &&\n\t\t\t\t!_hasDomParentOfType( node, this.blockElements, lca ) &&\n\t\t\t\t!_hasDomParentOfType( touchingNode, this.blockElements, lca )\n\t\t\t) {\n\t\t\t\t// Then they are in the same container element.\n\t\t\t\treturn touchingNode;\n\t\t\t}\n\t\t}\n\n\t\treturn null;\n\t}\n}\n\n// Helper function.\n// Used to check if given native `Element` or `Text` node has parent with tag name from `types` array.\n//\n// @param {Node} node\n// @param {Array.<String>} types\n// @param {Boolean} [boundaryParent] Can be given if parents should be checked up to a given element (excluding that element).\n// @returns {Boolean} `true` if such parent exists or `false` if it does not.\nfunction _hasDomParentOfType( node, types, boundaryParent ) {\n\tlet parents = getAncestors( node );\n\n\tif ( boundaryParent ) {\n\t\tparents = parents.slice( parents.indexOf( boundaryParent ) + 1 );\n\t}\n\n\treturn parents.some( parent => parent.tagName && types.includes( parent.tagName.toLowerCase() ) );\n}\n\n// A helper that executes given callback for each DOM node's ancestor, starting from the given node\n// and ending in document#documentElement.\n//\n// @param {Node} node\n// @param {Function} callback A callback to be executed for each ancestor.\nfunction forEachDomNodeAncestor( node, callback ) {\n\twhile ( node && node != global.document ) {\n\t\tcallback( node );\n\t\tnode = node.parentNode;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module engine/dataprocessor/htmldataprocessor\n */\n\n/* globals document, DOMParser */\n\nimport BasicHtmlWriter from './basichtmlwriter';\nimport DomConverter from '../view/domconverter';\nimport { NBSP_FILLER } from '../view/filler';\n\n/**\n * The HTML data processor class.\n * This data processor implementation uses HTML as input and output data.\n *\n * @implements module:engine/dataprocessor/dataprocessor~DataProcessor\n */\nexport default class HtmlDataProcessor {\n\t/**\n\t * Creates a new instance of the HTML data processor class.\n\t */\n\tconstructor() {\n\t\t/**\n\t\t * A DOM parser instance used to parse an HTML string to an HTML document.\n\t\t *\n\t\t * @private\n\t\t * @member {DOMParser}\n\t\t */\n\t\tthis._domParser = new DOMParser();\n\n\t\t/**\n\t\t * A DOM converter used to convert DOM elements to view elements.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/view/domconverter~DomConverter}\n\t\t */\n\t\tthis._domConverter = new DomConverter( { blockFiller: NBSP_FILLER } );\n\n\t\t/**\n\t\t * A basic HTML writer instance used to convert DOM elements to an HTML string.\n\t\t *\n\t\t * @private\n\t\t * @member {module:engine/dataprocessor/basichtmlwriter~BasicHtmlWriter}\n\t\t */\n\t\tthis._htmlWriter = new BasicHtmlWriter();\n\t}\n\n\t/**\n\t * Converts a provided {@link module:engine/view/documentfragment~DocumentFragment document fragment}\n\t * to data format &mdash; in this case to an HTML string.\n\t *\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment\n\t * @returns {String} HTML string.\n\t */\n\ttoData( viewFragment ) {\n\t\t// Convert view DocumentFragment to DOM DocumentFragment.\n\t\tconst domFragment = this._domConverter.viewToDom( viewFragment, document );\n\n\t\t// Convert DOM DocumentFragment to HTML output.\n\t\treturn this._htmlWriter.getHtml( domFragment );\n\t}\n\n\t/**\n\t * Converts the provided HTML string to a view tree.\n\t *\n\t * @param {String} data An HTML string.\n\t * @returns {module:engine/view/node~Node|module:engine/view/documentfragment~DocumentFragment|null} A converted view element.\n\t */\n\ttoView( data ) {\n\t\t// Convert input HTML data to DOM DocumentFragment.\n\t\tconst domFragment = this._toDom( data );\n\n\t\t// Convert DOM DocumentFragment to view DocumentFragment.\n\t\treturn this._domConverter.domToView( domFragment );\n\t}\n\n\t/**\n\t * Converts an HTML string to its DOM representation. Returns a document fragment containing nodes parsed from\n\t * the provided data.\n\t *\n\t * @private\n\t * @param {String} data\n\t * @returns {DocumentFragment}\n\t */\n\t_toDom( data ) {\n\t\tconst document = this._domParser.parseFromString( data, 'text/html' );\n\t\tconst fragment = document.createDocumentFragment();\n\t\tconst nodes = document.body.childNodes;\n\n\t\twhile ( nodes.length > 0 ) {\n\t\t\tfragment.appendChild( nodes[ 0 ] );\n\t\t}\n\n\t\treturn fragment;\n\t}\n}\n","var highlightRegExp = /highlight-(?:text|source)-([a-z0-9]+)/;\n\nfunction highlightedCodeBlock (turndownService) {\n  turndownService.addRule('highlightedCodeBlock', {\n    filter: function (node) {\n      var firstChild = node.firstChild;\n      return (\n        node.nodeName === 'DIV' &&\n        highlightRegExp.test(node.className) &&\n        firstChild &&\n        firstChild.nodeName === 'PRE'\n      )\n    },\n    replacement: function (content, node, options) {\n      var className = node.className || '';\n      var language = (className.match(highlightRegExp) || [null, ''])[1];\n\n      return (\n        '\\n\\n' + options.fence + language + '\\n' +\n        node.firstChild.textContent +\n        '\\n' + options.fence + '\\n\\n'\n      )\n    }\n  });\n}\n\nfunction strikethrough (turndownService) {\n  turndownService.addRule('strikethrough', {\n    filter: ['del', 's', 'strike'],\n    replacement: function (content) {\n      return '~' + content + '~'\n    }\n  });\n}\n\nvar indexOf = Array.prototype.indexOf;\nvar every = Array.prototype.every;\nvar rules = {};\n\nrules.tableCell = {\n  filter: ['th', 'td'],\n  replacement: function (content, node) {\n    return cell(content, node)\n  }\n};\n\nrules.tableRow = {\n  filter: 'tr',\n  replacement: function (content, node) {\n    var borderCells = '';\n    var alignMap = { left: ':--', right: '--:', center: ':-:' };\n\n    if (isHeadingRow(node)) {\n      for (var i = 0; i < node.childNodes.length; i++) {\n        var border = '---';\n        var align = (\n          node.childNodes[i].getAttribute('align') || ''\n        ).toLowerCase();\n\n        if (align) border = alignMap[align] || border;\n\n        borderCells += cell(border, node.childNodes[i]);\n      }\n    }\n    return '\\n' + content + (borderCells ? '\\n' + borderCells : '')\n  }\n};\n\nrules.table = {\n  // Only convert tables with a heading row.\n  // Tables with no heading row are kept using `keep` (see below).\n  filter: function (node) {\n    return node.nodeName === 'TABLE' && isHeadingRow(node.rows[0])\n  },\n\n  replacement: function (content) {\n    // Ensure there are no blank lines\n    content = content.replace('\\n\\n', '\\n');\n    return '\\n\\n' + content + '\\n\\n'\n  }\n};\n\nrules.tableSection = {\n  filter: ['thead', 'tbody', 'tfoot'],\n  replacement: function (content) {\n    return content\n  }\n};\n\n// A tr is a heading row if:\n// - the parent is a THEAD\n// - or if its the first child of the TABLE or the first TBODY (possibly\n//   following a blank THEAD)\n// - and every cell is a TH\nfunction isHeadingRow (tr) {\n  var parentNode = tr.parentNode;\n  return (\n    parentNode.nodeName === 'THEAD' ||\n    (\n      parentNode.firstChild === tr &&\n      (parentNode.nodeName === 'TABLE' || isFirstTbody(parentNode)) &&\n      every.call(tr.childNodes, function (n) { return n.nodeName === 'TH' })\n    )\n  )\n}\n\nfunction isFirstTbody (element) {\n  var previousSibling = element.previousSibling;\n  return (\n    element.nodeName === 'TBODY' && (\n      !previousSibling ||\n      (\n        previousSibling.nodeName === 'THEAD' &&\n        /^\\s*$/i.test(previousSibling.textContent)\n      )\n    )\n  )\n}\n\nfunction cell (content, node) {\n  var index = indexOf.call(node.parentNode.childNodes, node);\n  var prefix = ' ';\n  if (index === 0) prefix = '| ';\n  return prefix + content + ' |'\n}\n\nfunction tables (turndownService) {\n  turndownService.keep(function (node) {\n    return node.nodeName === 'TABLE' && !isHeadingRow(node.rows[0])\n  });\n  for (var key in rules) turndownService.addRule(key, rules[key]);\n}\n\nfunction taskListItems (turndownService) {\n  turndownService.addRule('taskListItems', {\n    filter: function (node) {\n      return node.type === 'checkbox' && node.parentNode.nodeName === 'LI'\n    },\n    replacement: function (content, node) {\n      return (node.checked ? '[x]' : '[ ]') + ' '\n    }\n  });\n}\n\nfunction gfm (turndownService) {\n  turndownService.use([\n    highlightedCodeBlock,\n    strikethrough,\n    tables,\n    taskListItems\n  ]);\n}\n\nexport { gfm, highlightedCodeBlock, strikethrough, tables, taskListItems };\n","function extend (destination) {\n  for (var i = 1; i < arguments.length; i++) {\n    var source = arguments[i];\n    for (var key in source) {\n      if (source.hasOwnProperty(key)) destination[key] = source[key];\n    }\n  }\n  return destination\n}\n\nfunction repeat (character, count) {\n  return Array(count + 1).join(character)\n}\n\nvar blockElements = [\n  'address', 'article', 'aside', 'audio', 'blockquote', 'body', 'canvas',\n  'center', 'dd', 'dir', 'div', 'dl', 'dt', 'fieldset', 'figcaption',\n  'figure', 'footer', 'form', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6',\n  'header', 'hgroup', 'hr', 'html', 'isindex', 'li', 'main', 'menu', 'nav',\n  'noframes', 'noscript', 'ol', 'output', 'p', 'pre', 'section', 'table',\n  'tbody', 'td', 'tfoot', 'th', 'thead', 'tr', 'ul'\n];\n\nfunction isBlock (node) {\n  return blockElements.indexOf(node.nodeName.toLowerCase()) !== -1\n}\n\nvar voidElements = [\n  'area', 'base', 'br', 'col', 'command', 'embed', 'hr', 'img', 'input',\n  'keygen', 'link', 'meta', 'param', 'source', 'track', 'wbr'\n];\n\nfunction isVoid (node) {\n  return voidElements.indexOf(node.nodeName.toLowerCase()) !== -1\n}\n\nvar voidSelector = voidElements.join();\nfunction hasVoid (node) {\n  return node.querySelector && node.querySelector(voidSelector)\n}\n\nvar rules = {};\n\nrules.paragraph = {\n  filter: 'p',\n\n  replacement: function (content) {\n    return '\\n\\n' + content + '\\n\\n'\n  }\n};\n\nrules.lineBreak = {\n  filter: 'br',\n\n  replacement: function (content, node, options) {\n    return options.br + '\\n'\n  }\n};\n\nrules.heading = {\n  filter: ['h1', 'h2', 'h3', 'h4', 'h5', 'h6'],\n\n  replacement: function (content, node, options) {\n    var hLevel = Number(node.nodeName.charAt(1));\n\n    if (options.headingStyle === 'setext' && hLevel < 3) {\n      var underline = repeat((hLevel === 1 ? '=' : '-'), content.length);\n      return (\n        '\\n\\n' + content + '\\n' + underline + '\\n\\n'\n      )\n    } else {\n      return '\\n\\n' + repeat('#', hLevel) + ' ' + content + '\\n\\n'\n    }\n  }\n};\n\nrules.blockquote = {\n  filter: 'blockquote',\n\n  replacement: function (content) {\n    content = content.replace(/^\\n+|\\n+$/g, '');\n    content = content.replace(/^/gm, '> ');\n    return '\\n\\n' + content + '\\n\\n'\n  }\n};\n\nrules.list = {\n  filter: ['ul', 'ol'],\n\n  replacement: function (content, node) {\n    var parent = node.parentNode;\n    if (parent.nodeName === 'LI' && parent.lastElementChild === node) {\n      return '\\n' + content\n    } else {\n      return '\\n\\n' + content + '\\n\\n'\n    }\n  }\n};\n\nrules.listItem = {\n  filter: 'li',\n\n  replacement: function (content, node, options) {\n    content = content\n      .replace(/^\\n+/, '') // remove leading newlines\n      .replace(/\\n+$/, '\\n') // replace trailing newlines with just a single one\n      .replace(/\\n/gm, '\\n    '); // indent\n    var prefix = options.bulletListMarker + '   ';\n    var parent = node.parentNode;\n    if (parent.nodeName === 'OL') {\n      var start = parent.getAttribute('start');\n      var index = Array.prototype.indexOf.call(parent.children, node);\n      prefix = (start ? Number(start) + index : index + 1) + '.  ';\n    }\n    return (\n      prefix + content + (node.nextSibling && !/\\n$/.test(content) ? '\\n' : '')\n    )\n  }\n};\n\nrules.indentedCodeBlock = {\n  filter: function (node, options) {\n    return (\n      options.codeBlockStyle === 'indented' &&\n      node.nodeName === 'PRE' &&\n      node.firstChild &&\n      node.firstChild.nodeName === 'CODE'\n    )\n  },\n\n  replacement: function (content, node, options) {\n    return (\n      '\\n\\n    ' +\n      node.firstChild.textContent.replace(/\\n/g, '\\n    ') +\n      '\\n\\n'\n    )\n  }\n};\n\nrules.fencedCodeBlock = {\n  filter: function (node, options) {\n    return (\n      options.codeBlockStyle === 'fenced' &&\n      node.nodeName === 'PRE' &&\n      node.firstChild &&\n      node.firstChild.nodeName === 'CODE'\n    )\n  },\n\n  replacement: function (content, node, options) {\n    var className = node.firstChild.className || '';\n    var language = (className.match(/language-(\\S+)/) || [null, ''])[1];\n\n    return (\n      '\\n\\n' + options.fence + language + '\\n' +\n      node.firstChild.textContent +\n      '\\n' + options.fence + '\\n\\n'\n    )\n  }\n};\n\nrules.horizontalRule = {\n  filter: 'hr',\n\n  replacement: function (content, node, options) {\n    return '\\n\\n' + options.hr + '\\n\\n'\n  }\n};\n\nrules.inlineLink = {\n  filter: function (node, options) {\n    return (\n      options.linkStyle === 'inlined' &&\n      node.nodeName === 'A' &&\n      node.getAttribute('href')\n    )\n  },\n\n  replacement: function (content, node) {\n    var href = node.getAttribute('href');\n    var title = node.title ? ' \"' + node.title + '\"' : '';\n    return '[' + content + '](' + href + title + ')'\n  }\n};\n\nrules.referenceLink = {\n  filter: function (node, options) {\n    return (\n      options.linkStyle === 'referenced' &&\n      node.nodeName === 'A' &&\n      node.getAttribute('href')\n    )\n  },\n\n  replacement: function (content, node, options) {\n    var href = node.getAttribute('href');\n    var title = node.title ? ' \"' + node.title + '\"' : '';\n    var replacement;\n    var reference;\n\n    switch (options.linkReferenceStyle) {\n      case 'collapsed':\n        replacement = '[' + content + '][]';\n        reference = '[' + content + ']: ' + href + title;\n        break\n      case 'shortcut':\n        replacement = '[' + content + ']';\n        reference = '[' + content + ']: ' + href + title;\n        break\n      default:\n        var id = this.references.length + 1;\n        replacement = '[' + content + '][' + id + ']';\n        reference = '[' + id + ']: ' + href + title;\n    }\n\n    this.references.push(reference);\n    return replacement\n  },\n\n  references: [],\n\n  append: function (options) {\n    var references = '';\n    if (this.references.length) {\n      references = '\\n\\n' + this.references.join('\\n') + '\\n\\n';\n      this.references = []; // Reset references\n    }\n    return references\n  }\n};\n\nrules.emphasis = {\n  filter: ['em', 'i'],\n\n  replacement: function (content, node, options) {\n    if (!content.trim()) return ''\n    return options.emDelimiter + content + options.emDelimiter\n  }\n};\n\nrules.strong = {\n  filter: ['strong', 'b'],\n\n  replacement: function (content, node, options) {\n    if (!content.trim()) return ''\n    return options.strongDelimiter + content + options.strongDelimiter\n  }\n};\n\nrules.code = {\n  filter: function (node) {\n    var hasSiblings = node.previousSibling || node.nextSibling;\n    var isCodeBlock = node.parentNode.nodeName === 'PRE' && !hasSiblings;\n\n    return node.nodeName === 'CODE' && !isCodeBlock\n  },\n\n  replacement: function (content) {\n    if (!content.trim()) return ''\n\n    var delimiter = '`';\n    var leadingSpace = '';\n    var trailingSpace = '';\n    var matches = content.match(/`+/gm);\n    if (matches) {\n      if (/^`/.test(content)) leadingSpace = ' ';\n      if (/`$/.test(content)) trailingSpace = ' ';\n      while (matches.indexOf(delimiter) !== -1) delimiter = delimiter + '`';\n    }\n\n    return delimiter + leadingSpace + content + trailingSpace + delimiter\n  }\n};\n\nrules.image = {\n  filter: 'img',\n\n  replacement: function (content, node) {\n    var alt = node.alt || '';\n    var src = node.getAttribute('src') || '';\n    var title = node.title || '';\n    var titlePart = title ? ' \"' + title + '\"' : '';\n    return src ? '![' + alt + ']' + '(' + src + titlePart + ')' : ''\n  }\n};\n\n/**\n * Manages a collection of rules used to convert HTML to Markdown\n */\n\nfunction Rules (options) {\n  this.options = options;\n  this._keep = [];\n  this._remove = [];\n\n  this.blankRule = {\n    replacement: options.blankReplacement\n  };\n\n  this.keepReplacement = options.keepReplacement;\n\n  this.defaultRule = {\n    replacement: options.defaultReplacement\n  };\n\n  this.array = [];\n  for (var key in options.rules) this.array.push(options.rules[key]);\n}\n\nRules.prototype = {\n  add: function (key, rule) {\n    this.array.unshift(rule);\n  },\n\n  keep: function (filter) {\n    this._keep.unshift({\n      filter: filter,\n      replacement: this.keepReplacement\n    });\n  },\n\n  remove: function (filter) {\n    this._remove.unshift({\n      filter: filter,\n      replacement: function () {\n        return ''\n      }\n    });\n  },\n\n  forNode: function (node) {\n    if (node.isBlank) return this.blankRule\n    var rule;\n\n    if ((rule = findRule(this.array, node, this.options))) return rule\n    if ((rule = findRule(this._keep, node, this.options))) return rule\n    if ((rule = findRule(this._remove, node, this.options))) return rule\n\n    return this.defaultRule\n  },\n\n  forEach: function (fn) {\n    for (var i = 0; i < this.array.length; i++) fn(this.array[i], i);\n  }\n};\n\nfunction findRule (rules, node, options) {\n  for (var i = 0; i < rules.length; i++) {\n    var rule = rules[i];\n    if (filterValue(rule, node, options)) return rule\n  }\n  return void 0\n}\n\nfunction filterValue (rule, node, options) {\n  var filter = rule.filter;\n  if (typeof filter === 'string') {\n    if (filter === node.nodeName.toLowerCase()) return true\n  } else if (Array.isArray(filter)) {\n    if (filter.indexOf(node.nodeName.toLowerCase()) > -1) return true\n  } else if (typeof filter === 'function') {\n    if (filter.call(rule, node, options)) return true\n  } else {\n    throw new TypeError('`filter` needs to be a string, array, or function')\n  }\n}\n\n/**\n * The collapseWhitespace function is adapted from collapse-whitespace\n * by Luc Thevenard.\n *\n * The MIT License (MIT)\n *\n * Copyright (c) 2014 Luc Thevenard <lucthevenard@gmail.com>\n *\n * Permission is hereby granted, free of charge, to any person obtaining a copy\n * of this software and associated documentation files (the \"Software\"), to deal\n * in the Software without restriction, including without limitation the rights\n * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell\n * copies of the Software, and to permit persons to whom the Software is\n * furnished to do so, subject to the following conditions:\n *\n * The above copyright notice and this permission notice shall be included in\n * all copies or substantial portions of the Software.\n *\n * THE SOFTWARE IS PROVIDED \"AS IS\", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR\n * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,\n * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE\n * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN\n * THE SOFTWARE.\n */\n\n/**\n * collapseWhitespace(options) removes extraneous whitespace from an the given element.\n *\n * @param {Object} options\n */\nfunction collapseWhitespace (options) {\n  var element = options.element;\n  var isBlock = options.isBlock;\n  var isVoid = options.isVoid;\n  var isPre = options.isPre || function (node) {\n    return node.nodeName === 'PRE'\n  };\n\n  if (!element.firstChild || isPre(element)) return\n\n  var prevText = null;\n  var prevVoid = false;\n\n  var prev = null;\n  var node = next(prev, element, isPre);\n\n  while (node !== element) {\n    if (node.nodeType === 3 || node.nodeType === 4) { // Node.TEXT_NODE or Node.CDATA_SECTION_NODE\n      var text = node.data.replace(/[ \\r\\n\\t]+/g, ' ');\n\n      if ((!prevText || / $/.test(prevText.data)) &&\n          !prevVoid && text[0] === ' ') {\n        text = text.substr(1);\n      }\n\n      // `text` might be empty at this point.\n      if (!text) {\n        node = remove(node);\n        continue\n      }\n\n      node.data = text;\n\n      prevText = node;\n    } else if (node.nodeType === 1) { // Node.ELEMENT_NODE\n      if (isBlock(node) || node.nodeName === 'BR') {\n        if (prevText) {\n          prevText.data = prevText.data.replace(/ $/, '');\n        }\n\n        prevText = null;\n        prevVoid = false;\n      } else if (isVoid(node)) {\n        // Avoid trimming space around non-block, non-BR void elements.\n        prevText = null;\n        prevVoid = true;\n      }\n    } else {\n      node = remove(node);\n      continue\n    }\n\n    var nextNode = next(prev, node, isPre);\n    prev = node;\n    node = nextNode;\n  }\n\n  if (prevText) {\n    prevText.data = prevText.data.replace(/ $/, '');\n    if (!prevText.data) {\n      remove(prevText);\n    }\n  }\n}\n\n/**\n * remove(node) removes the given node from the DOM and returns the\n * next node in the sequence.\n *\n * @param {Node} node\n * @return {Node} node\n */\nfunction remove (node) {\n  var next = node.nextSibling || node.parentNode;\n\n  node.parentNode.removeChild(node);\n\n  return next\n}\n\n/**\n * next(prev, current, isPre) returns the next node in the sequence, given the\n * current and previous nodes.\n *\n * @param {Node} prev\n * @param {Node} current\n * @param {Function} isPre\n * @return {Node}\n */\nfunction next (prev, current, isPre) {\n  if ((prev && prev.parentNode === current) || isPre(current)) {\n    return current.nextSibling || current.parentNode\n  }\n\n  return current.firstChild || current.nextSibling || current.parentNode\n}\n\n/*\n * Set up window for Node.js\n */\n\nvar root = (typeof window !== 'undefined' ? window : {});\n\n/*\n * Parsing HTML strings\n */\n\nfunction canParseHTMLNatively () {\n  var Parser = root.DOMParser;\n  var canParse = false;\n\n  // Adapted from https://gist.github.com/1129031\n  // Firefox/Opera/IE throw errors on unsupported types\n  try {\n    // WebKit returns null on unsupported types\n    if (new Parser().parseFromString('', 'text/html')) {\n      canParse = true;\n    }\n  } catch (e) {}\n\n  return canParse\n}\n\nfunction createHTMLParser () {\n  var Parser = function () {};\n\n  {\n    var JSDOM = require('jsdom').JSDOM;\n    Parser.prototype.parseFromString = function (string) {\n      return new JSDOM(string).window.document\n    };\n  }\n  return Parser\n}\n\nvar HTMLParser = canParseHTMLNatively() ? root.DOMParser : createHTMLParser();\n\nfunction RootNode (input) {\n  var root;\n  if (typeof input === 'string') {\n    var doc = htmlParser().parseFromString(\n      // DOM parsers arrange elements in the <head> and <body>.\n      // Wrapping in a custom element ensures elements are reliably arranged in\n      // a single element.\n      '<x-turndown id=\"turndown-root\">' + input + '</x-turndown>',\n      'text/html'\n    );\n    root = doc.getElementById('turndown-root');\n  } else {\n    root = input.cloneNode(true);\n  }\n  collapseWhitespace({\n    element: root,\n    isBlock: isBlock,\n    isVoid: isVoid\n  });\n\n  return root\n}\n\nvar _htmlParser;\nfunction htmlParser () {\n  _htmlParser = _htmlParser || new HTMLParser();\n  return _htmlParser\n}\n\nfunction Node (node) {\n  node.isBlock = isBlock(node);\n  node.isCode = node.nodeName.toLowerCase() === 'code' || node.parentNode.isCode;\n  node.isBlank = isBlank(node);\n  node.flankingWhitespace = flankingWhitespace(node);\n  return node\n}\n\nfunction isBlank (node) {\n  return (\n    ['A', 'TH', 'TD'].indexOf(node.nodeName) === -1 &&\n    /^\\s*$/i.test(node.textContent) &&\n    !isVoid(node) &&\n    !hasVoid(node)\n  )\n}\n\nfunction flankingWhitespace (node) {\n  var leading = '';\n  var trailing = '';\n\n  if (!node.isBlock) {\n    var hasLeading = /^[ \\r\\n\\t]/.test(node.textContent);\n    var hasTrailing = /[ \\r\\n\\t]$/.test(node.textContent);\n\n    if (hasLeading && !isFlankedByWhitespace('left', node)) {\n      leading = ' ';\n    }\n    if (hasTrailing && !isFlankedByWhitespace('right', node)) {\n      trailing = ' ';\n    }\n  }\n\n  return { leading: leading, trailing: trailing }\n}\n\nfunction isFlankedByWhitespace (side, node) {\n  var sibling;\n  var regExp;\n  var isFlanked;\n\n  if (side === 'left') {\n    sibling = node.previousSibling;\n    regExp = / $/;\n  } else {\n    sibling = node.nextSibling;\n    regExp = /^ /;\n  }\n\n  if (sibling) {\n    if (sibling.nodeType === 3) {\n      isFlanked = regExp.test(sibling.nodeValue);\n    } else if (sibling.nodeType === 1 && !isBlock(sibling)) {\n      isFlanked = regExp.test(sibling.textContent);\n    }\n  }\n  return isFlanked\n}\n\nvar reduce = Array.prototype.reduce;\nvar leadingNewLinesRegExp = /^\\n*/;\nvar trailingNewLinesRegExp = /\\n*$/;\n\nfunction TurndownService (options) {\n  if (!(this instanceof TurndownService)) return new TurndownService(options)\n\n  var defaults = {\n    rules: rules,\n    headingStyle: 'setext',\n    hr: '* * *',\n    bulletListMarker: '*',\n    codeBlockStyle: 'indented',\n    fence: '```',\n    emDelimiter: '_',\n    strongDelimiter: '**',\n    linkStyle: 'inlined',\n    linkReferenceStyle: 'full',\n    br: '  ',\n    blankReplacement: function (content, node) {\n      return node.isBlock ? '\\n\\n' : ''\n    },\n    keepReplacement: function (content, node) {\n      return node.isBlock ? '\\n\\n' + node.outerHTML + '\\n\\n' : node.outerHTML\n    },\n    defaultReplacement: function (content, node) {\n      return node.isBlock ? '\\n\\n' + content + '\\n\\n' : content\n    }\n  };\n  this.options = extend({}, defaults, options);\n  this.rules = new Rules(this.options);\n}\n\nTurndownService.prototype = {\n  /**\n   * The entry point for converting a string or DOM node to Markdown\n   * @public\n   * @param {String|HTMLElement} input The string or DOM node to convert\n   * @returns A Markdown representation of the input\n   * @type String\n   */\n\n  turndown: function (input) {\n    if (!canConvert(input)) {\n      throw new TypeError(\n        input + ' is not a string, or an element/document/fragment node.'\n      )\n    }\n\n    if (input === '') return ''\n\n    var output = process.call(this, new RootNode(input));\n    return postProcess.call(this, output)\n  },\n\n  /**\n   * Add one or more plugins\n   * @public\n   * @param {Function|Array} plugin The plugin or array of plugins to add\n   * @returns The Turndown instance for chaining\n   * @type Object\n   */\n\n  use: function (plugin) {\n    if (Array.isArray(plugin)) {\n      for (var i = 0; i < plugin.length; i++) this.use(plugin[i]);\n    } else if (typeof plugin === 'function') {\n      plugin(this);\n    } else {\n      throw new TypeError('plugin must be a Function or an Array of Functions')\n    }\n    return this\n  },\n\n  /**\n   * Adds a rule\n   * @public\n   * @param {String} key The unique key of the rule\n   * @param {Object} rule The rule\n   * @returns The Turndown instance for chaining\n   * @type Object\n   */\n\n  addRule: function (key, rule) {\n    this.rules.add(key, rule);\n    return this\n  },\n\n  /**\n   * Keep a node (as HTML) that matches the filter\n   * @public\n   * @param {String|Array|Function} filter The unique key of the rule\n   * @returns The Turndown instance for chaining\n   * @type Object\n   */\n\n  keep: function (filter) {\n    this.rules.keep(filter);\n    return this\n  },\n\n  /**\n   * Remove a node that matches the filter\n   * @public\n   * @param {String|Array|Function} filter The unique key of the rule\n   * @returns The Turndown instance for chaining\n   * @type Object\n   */\n\n  remove: function (filter) {\n    this.rules.remove(filter);\n    return this\n  },\n\n  /**\n   * Escapes Markdown syntax\n   * @public\n   * @param {String} string The string to escape\n   * @returns A string with Markdown syntax escaped\n   * @type String\n   */\n\n  escape: function (string) {\n    return (\n      string\n        // Escape backslash escapes!\n        .replace(/\\\\(\\S)/g, '\\\\\\\\$1')\n\n        // Escape headings\n        .replace(/^(#{1,6} )/gm, '\\\\$1')\n\n        // Escape hr\n        .replace(/^([-*_] *){3,}$/gm, function (match, character) {\n          return match.split(character).join('\\\\' + character)\n        })\n\n        // Escape ol bullet points\n        .replace(/^(\\W* {0,3})(\\d+)\\. /gm, '$1$2\\\\. ')\n\n        // Escape ul bullet points\n        .replace(/^([^\\\\\\w]*)[*+-] /gm, function (match) {\n          return match.replace(/([*+-])/g, '\\\\$1')\n        })\n\n        // Escape blockquote indents\n        .replace(/^(\\W* {0,3})> /gm, '$1\\\\> ')\n\n        // Escape em/strong *\n        .replace(/\\*+(?![*\\s\\W]).+?\\*+/g, function (match) {\n          return match.replace(/\\*/g, '\\\\*')\n        })\n\n        // Escape em/strong _\n        .replace(/_+(?![_\\s\\W]).+?_+/g, function (match) {\n          return match.replace(/_/g, '\\\\_')\n        })\n\n        // Escape code _\n        .replace(/`+(?![`\\s\\W]).+?`+/g, function (match) {\n          return match.replace(/`/g, '\\\\`')\n        })\n\n        // Escape link brackets\n        .replace(/[\\[\\]]/g, '\\\\$&') // eslint-disable-line no-useless-escape\n    )\n  }\n};\n\n/**\n * Reduces a DOM node down to its Markdown string equivalent\n * @private\n * @param {HTMLElement} parentNode The node to convert\n * @returns A Markdown representation of the node\n * @type String\n */\n\nfunction process (parentNode) {\n  var self = this;\n  return reduce.call(parentNode.childNodes, function (output, node) {\n    node = new Node(node);\n\n    var replacement = '';\n    if (node.nodeType === 3) {\n      replacement = node.isCode ? node.nodeValue : self.escape(node.nodeValue);\n    } else if (node.nodeType === 1) {\n      replacement = replacementForNode.call(self, node);\n    }\n\n    return join(output, replacement)\n  }, '')\n}\n\n/**\n * Appends strings as each rule requires and trims the output\n * @private\n * @param {String} output The conversion output\n * @returns A trimmed version of the ouput\n * @type String\n */\n\nfunction postProcess (output) {\n  var self = this;\n  this.rules.forEach(function (rule) {\n    if (typeof rule.append === 'function') {\n      output = join(output, rule.append(self.options));\n    }\n  });\n\n  return output.replace(/^[\\t\\r\\n]+/, '').replace(/[\\t\\r\\n\\s]+$/, '')\n}\n\n/**\n * Converts an element node to its Markdown equivalent\n * @private\n * @param {HTMLElement} node The node to convert\n * @returns A Markdown representation of the node\n * @type String\n */\n\nfunction replacementForNode (node) {\n  var rule = this.rules.forNode(node);\n  var content = process.call(this, node);\n  var whitespace = node.flankingWhitespace;\n  if (whitespace.leading || whitespace.trailing) content = content.trim();\n  return (\n    whitespace.leading +\n    rule.replacement(content, node, this.options) +\n    whitespace.trailing\n  )\n}\n\n/**\n * Determines the new lines between the current output and the replacement\n * @private\n * @param {String} output The current conversion output\n * @param {String} replacement The string to append to the output\n * @returns The whitespace to separate the current output and the replacement\n * @type String\n */\n\nfunction separatingNewlines (output, replacement) {\n  var newlines = [\n    output.match(trailingNewLinesRegExp)[0],\n    replacement.match(leadingNewLinesRegExp)[0]\n  ].sort();\n  var maxNewlines = newlines[newlines.length - 1];\n  return maxNewlines.length < 2 ? maxNewlines : '\\n\\n'\n}\n\nfunction join (string1, string2) {\n  var separator = separatingNewlines(string1, string2);\n\n  // Remove trailing/leading newlines and replace with separator\n  string1 = string1.replace(trailingNewLinesRegExp, '');\n  string2 = string2.replace(leadingNewLinesRegExp, '');\n\n  return string1 + separator + string2\n}\n\n/**\n * Determines whether an input can be converted\n * @private\n * @param {String|HTMLElement} input Describe this parameter\n * @returns Describe what it returns\n * @type String|Object|Array|Boolean|Number\n */\n\nfunction canConvert (input) {\n  return (\n    input != null && (\n      typeof input === 'string' ||\n      (input.nodeType && (\n        input.nodeType === 1 || input.nodeType === 9 || input.nodeType === 11\n      ))\n    )\n  )\n}\n\nexport default TurndownService;\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module markdown-gfm/commonmarkdataprocessor\n */\n\n/* eslint-env browser */\n\nimport HtmlDataProcessor from '@ckeditor/ckeditor5-engine/src/dataprocessor/htmldataprocessor';\nimport DomConverter from '@ckeditor/ckeditor5-engine/src/view/domconverter';\nimport {highlightedCodeBlock, strikethrough, taskListItems} from 'turndown-plugin-gfm';\nimport TurndownService from 'turndown';\n\n/**\n * This data processor implementation uses CommonMark as input/output data.\n *\n * @implements module:engine/dataprocessor/dataprocessor~DataProcessor\n */\nexport default class CommonMarkDataProcessor {\n\tconstructor() {\n\t\tthis._htmlDP = new HtmlDataProcessor();\n\t\tthis._domConverter = new DomConverter();\n\t}\n\n\t/**\n\t * Converts the provided CommonMark string to view tree.\n\t *\n\t * @param {String} data A CommonMark string.\n\t * @returns {module:engine/view/documentfragment~DocumentFragment} The converted view element.\n\t */\n\ttoView( data ) {\n\t\tconst md = require( 'markdown-it' )( {\n\t\t\t// Output html\n\t\t\thtml: true,\n\t\t\t// Use GFM language fence prefix\n\t\t\tlangPrefix: 'language-',\n\t\t} );\n\t\tconst html = md.render( data );\n\n\t\treturn this._htmlDP.toView( html );\n\t}\n\n\t/**\n\t * Converts the provided {@link module:engine/view/documentfragment~DocumentFragment} to data format &mdash; in this\n\t * case to a CommonMark string.\n\t *\n\t * @param {module:engine/view/documentfragment~DocumentFragment} viewFragment\n\t * @returns {String} CommonMark string.\n\t */\n\ttoData( viewFragment ) {\n\t\t// Convert view DocumentFragment to DOM DocumentFragment.\n\t\tconst domFragment = this._domConverter.viewToDom( viewFragment, document );\n\n\t\t// Use Turndown to convert DOM fragment to markdown\n\t\tconst turndownService = new TurndownService( {\n\t\t\theadingStyle: 'atx',\n\t\t\tcodeBlockStyle: 'fenced'\n\t\t} );\n\n\t\tturndownService.use([\n\t\t\thighlightedCodeBlock,\n\t\t\tstrikethrough,\n\t\t\ttaskListItems,\n\t\t]);\n\n\t\t// Keep HTML tables\n\t\tturndownService.keep(function (node) {\n\t\t\treturn node.nodeName === 'TABLE';\n\t\t});\n\n\t\tturndownService.addRule( 'openProjectMacros', {\n\t\t\tfilter: [ 'macro' ],\n\t\t\treplacement: ( content, node ) => {\n\t\t\t\tnode.innerHTML = '';\n\t\t\t\treturn node.outerHTML;\n\t\t\t}\n\t\t});\n\n\t\treturn turndownService.turndown( domFragment );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/converters/upcasttable\n */\n\nimport ModelRange from '@ckeditor/ckeditor5-engine/src/model/range';\nimport ModelPosition from '@ckeditor/ckeditor5-engine/src/model/position';\n\n/**\n * View table element to model table element conversion helper.\n *\n * This conversion helper converts the table element as well as table rows.\n *\n * @returns {Function} Conversion helper.\n */\nexport default function upcastTable() {\n\treturn dispatcher => {\n\t\tdispatcher.on( 'element:table', ( evt, data, conversionApi ) => {\n\t\t\tconst viewTable = data.viewItem;\n\n\t\t\t// When element was already consumed then skip it.\n\t\t\tif ( !conversionApi.consumable.test( viewTable, { name: true } ) ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst { rows, headingRows, headingColumns } = scanTable( viewTable );\n\n\t\t\t// Only set attributes if values is greater then 0.\n\t\t\tconst attributes = {};\n\n\t\t\tif ( headingColumns ) {\n\t\t\t\tattributes.headingColumns = headingColumns;\n\t\t\t}\n\n\t\t\tif ( headingRows ) {\n\t\t\t\tattributes.headingRows = headingRows;\n\t\t\t}\n\n\t\t\tconst table = conversionApi.writer.createElement( 'table', attributes );\n\n\t\t\t// Insert element on allowed position.\n\t\t\tconst splitResult = conversionApi.splitToAllowedParent( table, data.modelCursor );\n\t\t\tconversionApi.writer.insert( table, splitResult.position );\n\t\t\tconversionApi.consumable.consume( viewTable, { name: true } );\n\n\t\t\tif ( rows.length ) {\n\t\t\t\t// Upcast table rows in proper order (heading rows first).\n\t\t\t\trows.forEach( row => conversionApi.convertItem( row, ModelPosition.createAt( table, 'end' ) ) );\n\t\t\t} else {\n\t\t\t\t// Create one row and one table cell for empty table.\n\t\t\t\tconst row = conversionApi.writer.createElement( 'tableRow' );\n\n\t\t\t\tconversionApi.writer.insert( row, ModelPosition.createAt( table, 'end' ) );\n\t\t\t\tconversionApi.writer.insertElement( 'tableCell', ModelPosition.createAt( row, 'end' ) );\n\t\t\t}\n\n\t\t\t// Set conversion result range.\n\t\t\tdata.modelRange = new ModelRange(\n\t\t\t\t// Range should start before inserted element\n\t\t\t\tModelPosition.createBefore( table ),\n\t\t\t\t// Should end after but we need to take into consideration that children could split our\n\t\t\t\t// element, so we need to move range after parent of the last converted child.\n\t\t\t\t// before: <allowed>[]</allowed>\n\t\t\t\t// after: <allowed>[<converted><child></child></converted><child></child><converted>]</converted></allowed>\n\t\t\t\tModelPosition.createAfter( table )\n\t\t\t);\n\n\t\t\t// Now we need to check where the modelCursor should be.\n\t\t\t// If we had to split parent to insert our element then we want to continue conversion inside split parent.\n\t\t\t//\n\t\t\t// before: <allowed><notAllowed>[]</notAllowed></allowed>\n\t\t\t// after:  <allowed><notAllowed></notAllowed><converted></converted><notAllowed>[]</notAllowed></allowed>\n\t\t\tif ( splitResult.cursorParent ) {\n\t\t\t\tdata.modelCursor = ModelPosition.createAt( splitResult.cursorParent );\n\n\t\t\t\t// Otherwise just continue after inserted element.\n\t\t\t} else {\n\t\t\t\tdata.modelCursor = data.modelRange.end;\n\t\t\t}\n\t\t}, { priority: 'normal' } );\n\t};\n}\n\n// Scans table rows and extracts required metadata from the table:\n//\n// headingRows    - the number of rows that goes as table header.\n// headingColumns - max number of row headings.\n// rows           - sorted `<tr>`s as they should go into the model - ie. if `<thead>` is inserted after `<tbody>` in the view.\n//\n// @param {module:engine/view/element~Element} viewTable\n// @returns {{headingRows, headingColumns, rows}}\nfunction scanTable( viewTable ) {\n\tconst tableMeta = {\n\t\theadingRows: 0,\n\t\theadingColumns: 0\n\t};\n\n\t// The `<tbody>` and <thead> sections in the DOM do not have to be in order `<thead>` -> `<tbody>` and there might be more then one of\n\t// them.\n\t// As the model does not have those sections, rows from different sections must be sorted.\n\t// For example, below is a valid HTML table:\n\t//\n\t//\t\t<table>\n\t//\t\t\t<tbody><tr><td>2</td></tr></tbody>\n\t//\t\t\t<thead><tr><td>1</td></tr></thead>\n\t//\t\t\t<tbody><tr><td>3</td></tr></tbody>\n\t//\t\t</table>\n\t//\n\t// But browsers will render rows in order as: 1 as heading and 2 and 3 as (body).\n\tconst headRows = [];\n\tconst bodyRows = [];\n\n\t// Currently the editor does not support more then one <thead> section.\n\t// Only the first <thead> from the view will be used as heading rows and others will be converted to body rows.\n\tlet firstTheadElement;\n\n\tfor ( const tableChild of Array.from( viewTable.getChildren() ) ) {\n\t\t// Only <thead>, <tbody> & <tfoot> from allowed table children can have <tr>s.\n\t\t// The else is for future purposes (mainly <caption>).\n\t\tif ( tableChild.name === 'tbody' || tableChild.name === 'thead' || tableChild.name === 'tfoot' ) {\n\t\t\t// Save the first <thead> in the table as table header - all other ones will be converted to table body rows.\n\t\t\tif ( tableChild.name === 'thead' && !firstTheadElement ) {\n\t\t\t\tfirstTheadElement = tableChild;\n\t\t\t}\n\n\t\t\tfor ( const tr of Array.from( tableChild.getChildren() ) ) {\n\t\t\t\t// This <tr> is a child of a first <thead> element.\n\t\t\t\tif ( tr.parent.name === 'thead' && tr.parent === firstTheadElement ) {\n\t\t\t\t\ttableMeta.headingRows++;\n\t\t\t\t\theadRows.push( tr );\n\t\t\t\t} else {\n\t\t\t\t\tbodyRows.push( tr );\n\t\t\t\t\t// For other rows check how many column headings this row has.\n\n\t\t\t\t\tconst headingCols = scanRowForHeadingColumns( tr, tableMeta, firstTheadElement );\n\n\t\t\t\t\tif ( headingCols > tableMeta.headingColumns ) {\n\t\t\t\t\t\ttableMeta.headingColumns = headingCols;\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\t\t}\n\t}\n\n\ttableMeta.rows = [ ...headRows, ...bodyRows ];\n\n\treturn tableMeta;\n}\n\n// Scans `<tr>` and its children for metadata:\n// - For heading row:\n//     - either adds this row to heading or body rows.\n//     - updates number of heading rows.\n// - For body rows:\n//     - calculates the number of column headings.\n//\n// @param {module:engine/view/element~Element} tr\n// @returns {Number}\nfunction scanRowForHeadingColumns( tr ) {\n\tlet headingColumns = 0;\n\tlet index = 0;\n\n\t// Filter out empty text nodes from tr children.\n\tconst children = Array.from( tr.getChildren() )\n\t\t.filter( child => child.name === 'th' || child.name === 'td' );\n\n\t// Count starting adjacent <th> elements of a <tr>.\n\twhile ( index < children.length && children[ index ].name === 'th' ) {\n\t\tconst th = children[ index ];\n\n\t\t// Adjust columns calculation by the number of spanned columns.\n\t\tconst colspan = parseInt( th.getAttribute( 'colspan' ) || 1 );\n\n\t\theadingColumns = headingColumns + colspan;\n\t\tindex++;\n\t}\n\n\treturn headingColumns;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/tablewalker\n */\n\n/**\n * Table iterator class. It allows to iterate over table cells. For each cell the iterator yields\n * {@link module:table/tablewalker~TableWalkerValue} with proper table cell attributes.\n */\nexport default class TableWalker {\n\t/**\n\t * Creates an instance of the table walker.\n\t *\n\t *\n\t * The table walker iterates internally by traversing the table from row index = 0 and column index = 0.\n\t * It walks row by row and column by column in order to output values defined in the constructor.\n\t * By default it will output only those locations that are occupied by a cell. To include also spanned rows and columns,\n\t * pass the `includeSpanned` option to the constructor.\n\t *\n\t * The most important values of the iterator are column and row indexes of a cell.\n\t *\n\t * To iterate over a given row:\n\t *\n\t *\t\tconst tableWalker = new TableWalker( table, { startRow: 1, endRow: 2 } );\n\t *\n\t *\t\tfor ( const cellInfo of tableWalker ) {\n\t *\t\t\tconsole.log( 'A cell at row ' + cellInfo.row + ' and column ' + cellInfo.column );\n\t *\t\t}\n\t *\n\t * For instance the code above for the following table:\n\t *\n\t *\t\t+----+----+----+----+----+----+\n\t *\t\t| 00      | 02 | 03      | 05 |\n\t *\t\t|         +----+----+----+----+\n\t *\t\t|         | 12      | 14 | 15 |\n\t *\t\t|         +----+----+----+----+\n\t *\t\t|         | 22                |\n\t *\t\t|----+----+                   +\n\t *\t\t| 31 | 32 |                   |\n\t *\t\t+----+----+----+----+----+----+\n\t *\n\t * will log in the console:\n\t *\n\t *\t\t'A cell at row 1 and column 2'\n\t *\t\t'A cell at row 1 and column 4'\n\t *\t\t'A cell at row 1 and column 5'\n\t *\t\t'A cell at row 2 and column 2'\n\t *\n\t * To also iterate over spanned cells:\n\t *\n\t *\t\tconst tableWalker = new TableWalker( table, { startRow: 1, endRow: 1, includeSpanned: true } );\n\t *\n\t *\t\tfor ( const cellInfo of tableWalker ) {\n\t *\t\t\tconsole.log( 'Cell at ' + cellInfo.row + ' x ' + cellInfo.column + ' : ' + ( cellInfo.cell ? 'has data' : 'is spanned' ) );\n\t *\t\t}\n\t *\n\t * will log in the console for the table from previous example:\n\t *\n\t *\t\t'Cell at 1 x 0 : is spanned'\n\t *\t\t'Cell at 1 x 1 : is spanned'\n\t *\t\t'Cell at 1 x 2 : has data'\n\t *\t\t'Cell at 1 x 3 : is spanned'\n\t *\t\t'Cell at 1 x 4 : has data'\n\t *\t\t'Cell at 1 x 5 : has data'\n\t *\n\t * @constructor\n\t * @param {module:engine/model/element~Element} table A table over which the walker iterates.\n\t * @param {Object} [options={}] An object with configuration.\n\t * @param {Number} [options.column] A column index for which this iterator will output cells.\n\t * @param {Number} [options.startRow=0] A row index for which this iterator should start.\n\t * @param {Number} [options.endRow] A row index for which this iterator should end.\n\t * @param {Boolean} [options.includeSpanned] Also return values for spanned cells.\n\t */\n\tconstructor( table, options = {} ) {\n\t\t/**\n\t\t * The walker's table element.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:engine/model/element~Element}\n\t\t */\n\t\tthis.table = table;\n\n\t\t/**\n\t\t * A row index on which this iterator will start.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.startRow = options.startRow || 0;\n\n\t\t/**\n\t\t * A row index on which this iterator will end.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.endRow = typeof options.endRow == 'number' ? options.endRow : undefined;\n\n\t\t/**\n\t\t * Enables output of spanned cells that are normally not yielded.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean}\n\t\t */\n\t\tthis.includeSpanned = !!options.includeSpanned;\n\n\t\t/**\n\t\t * If set, the table walker will only output cells of a given column or cells that overlap it.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t */\n\t\tthis.column = typeof options.column == 'number' ? options.column : undefined;\n\n\t\t/**\n\t\t * Row indexes to skip from the iteration.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Set<Number>}\n\t\t * @private\n\t\t */\n\t\tthis._skipRows = new Set();\n\n\t\t/**\n\t\t * The current row index.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t * @private\n\t\t */\n\t\tthis._row = 0;\n\n\t\t/**\n\t\t * The current column index.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t * @private\n\t\t */\n\t\tthis._column = 0;\n\n\t\t/**\n\t\t * The cell index in a parent row. For spanned cells when {@link #includeSpanned} is set to `true`,\n\t\t * this represents the index of the next table cell.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Number}\n\t\t * @private\n\t\t */\n\t\tthis._cell = 0;\n\n\t\t/**\n\t\t * Holds a map of spanned cells in a table.\n\t\t *\n\t\t * @readonly\n\t\t * @member {Map<Number, Map.<Number, Number>>}\n\t\t * @private\n\t\t */\n\t\tthis._spannedCells = new Map();\n\t}\n\n\t/**\n\t * Iterable interface.\n\t *\n\t * @returns {Iterable.<module:table/tablewalker~TableWalkerValue>}\n\t */\n\t[ Symbol.iterator ]() {\n\t\treturn this;\n\t}\n\n\t/**\n\t * Gets the next table walker's value.\n\t *\n\t * @returns {module:table/tablewalker~TableWalkerValue} The next table walker's value.\n\t */\n\tnext() {\n\t\tconst row = this.table.getChild( this._row );\n\n\t\t// Iterator is done when no row (table end) or the row is after #endRow.\n\t\tif ( !row || this._isOverEndRow() ) {\n\t\t\treturn { done: true };\n\t\t}\n\n\t\t// Spanned cell location handling.\n\t\tif ( this._isSpanned( this._row, this._column ) ) {\n\t\t\t// Current column must be kept as it will be updated before returning current value.\n\t\t\tconst currentColumn = this._column;\n\t\t\tconst outValue = this._formatOutValue( undefined, currentColumn );\n\n\t\t\t// Advance to next column - always.\n\t\t\tthis._column++;\n\n\t\t\tconst skipCurrentValue = !this.includeSpanned || this._shouldSkipRow() || this._shouldSkipColumn( currentColumn, 1 );\n\n\t\t\t// The current value will be returned only if #includedSpanned=true and also current row and column are not skipped.\n\t\t\treturn skipCurrentValue ? this.next() : outValue;\n\t\t}\n\n\t\t// The cell location is not spanned by other cells.\n\t\tconst cell = row.getChild( this._cell );\n\n\t\tif ( !cell ) {\n\t\t\t// If there are no more cells left in row advance to next row.\n\t\t\tthis._row++;\n\t\t\t// And reset column & cell indexes.\n\t\t\tthis._column = 0;\n\t\t\tthis._cell = 0;\n\n\t\t\t// Return next value.\n\t\t\treturn this.next();\n\t\t}\n\n\t\t// Read table cell attributes.\n\t\tconst colspan = parseInt( cell.getAttribute( 'colspan' ) || 1 );\n\t\tconst rowspan = parseInt( cell.getAttribute( 'rowspan' ) || 1 );\n\n\t\t// Record this cell spans if it's not 1x1 cell.\n\t\tif ( colspan > 1 || rowspan > 1 ) {\n\t\t\tthis._recordSpans( this._row, this._column, rowspan, colspan );\n\t\t}\n\n\t\t// Current column must be kept as it will be updated before returning current value.\n\t\tconst currentColumn = this._column;\n\t\tconst outValue = this._formatOutValue( cell, currentColumn, rowspan, colspan );\n\n\t\t// Advance to next column before returning value.\n\t\tthis._column++;\n\n\t\t// Advance to next cell in a parent row before returning value.\n\t\tthis._cell++;\n\n\t\tconst skipCurrentValue = this._shouldSkipRow() || this._shouldSkipColumn( currentColumn, colspan );\n\n\t\t// The current value will be returned only if current row & column are not skipped.\n\t\treturn skipCurrentValue ? this.next() : outValue;\n\t}\n\n\t/**\n\t * Marks a row to skip in the next iteration. It will also skip cells from the current row if there are any cells from the current row\n\t * to output.\n\t *\n\t * @param {Number} row Row index to skip.\n\t */\n\tskipRow( row ) {\n\t\tthis._skipRows.add( row );\n\t}\n\n\t/**\n\t * Checks if the current row is over {@link #endRow}.\n\t *\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_isOverEndRow() {\n\t\t// If {@link #endRow) is defined skip all rows above it.\n\t\treturn this.endRow !== undefined && this._row > this.endRow;\n\t}\n\n\t/**\n\t * A common method for formatting the iterator's output value.\n\t *\n\t * @param {module:engine/model/element~Element|undefined} cell The table cell to output. It might be undefined for spanned cell\n\t * locations.\n\t * @param {Number} column Column index (use the cached value)\n\t * @param {Number} rowspan Rowspan of the current cell.\n\t * @param {Number} colspan Colspan of the current cell.\n\t * @returns {{done: boolean, value: {cell: *, row: Number, column: *, rowspan: *, colspan: *, cellIndex: Number}}}\n\t * @private\n\t */\n\t_formatOutValue( cell, column, rowspan = 1, colspan = 1 ) {\n\t\treturn {\n\t\t\tdone: false,\n\t\t\tvalue: {\n\t\t\t\tcell,\n\t\t\t\trow: this._row,\n\t\t\t\tcolumn,\n\t\t\t\trowspan,\n\t\t\t\tcolspan,\n\t\t\t\tcellIndex: this._cell\n\t\t\t}\n\t\t};\n\t}\n\n\t/**\n\t * Checks if the current row should be skipped.\n\t *\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_shouldSkipRow() {\n\t\tconst rowIsBelowStartRow = this._row < this.startRow;\n\t\tconst rowIsMarkedAsSkipped = this._skipRows.has( this._row );\n\n\t\treturn rowIsBelowStartRow || rowIsMarkedAsSkipped;\n\t}\n\n\t/**\n\t * Checks if the current column should be skipped.\n\t *\n\t * @param {Number} column\n\t * @param {Number} colspan\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_shouldSkipColumn( column, colspan ) {\n\t\tif ( this.column === undefined ) {\n\t\t\t// The {@link #column} is not defined so output all columns.\n\t\t\treturn false;\n\t\t}\n\n\t\t// When outputting cells from given column we skip:\n\t\t// - Cells that are not on that column.\n\t\tconst isCurrentColumn = column === this.column;\n\t\t// - CSells that are before given column and they overlaps given column.\n\t\tconst isPreviousThatOverlapsColumn = column < this.column && column + colspan > this.column;\n\n\t\treturn !isCurrentColumn && !isPreviousThatOverlapsColumn;\n\t}\n\n\t/**\n\t * Checks if the current cell location (row x column) is spanned by another cell.\n\t *\n\t * @param {Number} row Row index of a cell location to check.\n\t * @param {Number} column Column index of a cell location to check.\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_isSpanned( row, column ) {\n\t\tif ( !this._spannedCells.has( row ) ) {\n\t\t\t// No spans for given row.\n\t\t\treturn false;\n\t\t}\n\n\t\tconst rowSpans = this._spannedCells.get( row );\n\n\t\t// If spans for given rows has entry for column it means that this location if spanned by other cell.\n\t\treturn rowSpans.has( column );\n\t}\n\n\t/**\n\t * Updates spanned cells map relative to the current cell location and its span dimensions.\n\t *\n\t * @param {Number} row Row index of a cell.\n\t * @param {Number} column Column index of a cell.\n\t * @param {Number} rowspan Cell height.\n\t * @param {Number} colspan Cell width.\n\t * @private\n\t */\n\t_recordSpans( row, column, rowspan, colspan ) {\n\t\t// This will update all cell locations after current column - ie a cell has colspan set.\n\t\tfor ( let columnToUpdate = column + 1; columnToUpdate <= column + colspan - 1; columnToUpdate++ ) {\n\t\t\tthis._markSpannedCell( row, columnToUpdate );\n\t\t}\n\n\t\t// This will update all rows below current up to row's height.\n\t\tfor ( let rowToUpdate = row + 1; rowToUpdate < row + rowspan; rowToUpdate++ ) {\n\t\t\tfor ( let columnToUpdate = column; columnToUpdate <= column + colspan - 1; columnToUpdate++ ) {\n\t\t\t\tthis._markSpannedCell( rowToUpdate, columnToUpdate );\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Marks the cell location as spanned by another cell.\n\t *\n\t * @param {Number} row Row index of the cell location.\n\t * @param {Number} column Column index of the cell location.\n\t * @private\n\t */\n\t_markSpannedCell( row, column ) {\n\t\tif ( !this._spannedCells.has( row ) ) {\n\t\t\tthis._spannedCells.set( row, new Map() );\n\t\t}\n\n\t\tconst rowSpans = this._spannedCells.get( row );\n\n\t\trowSpans.set( column, true );\n\t}\n}\n\n/**\n * An object returned by {@link module:table/tablewalker~TableWalker} when traversing table cells.\n *\n * @typedef {Object} module:table/tablewalker~TableWalkerValue\n * @property {module:engine/model/element~Element} [cell] The current table cell. Might be empty if\n * {@link module:table/tablewalker~TableWalker#includeSpanned} is set to `true`.\n * @property {Number} row The row index of a cell.\n * @property {Number} column The column index of a cell. Column index is adjusted to widths and heights of previous cells.\n * @property {Number} [colspan] The `colspan` attribute of a cell. It is always defined even if the model attribute is not present. Not\n * set if {@link module:table/tablewalker~TableWalker#includeSpanned} is set to `true`.\n * @property {Number} [rowspan] The `rowspan` attribute of a cell. It is always defined even if the model attribute is not present. Not\n * set if {@link module:table/tablewalker~TableWalker#includeSpanned} is set to `true`.\n * @property {Number} cellIndex The index of the current cell in a parent row. When using the `includeSpanned` option it will indicate the\n * next child index if #cell is empty (which indicates that the cell is spanned by another cell).\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/utils\n */\n\n/**\n * Returns the parent table.\n *\n * @param {module:engine/model/position~Position} position\n * @returns {module:engine/model/element~Element|module:engine/model/documentfragment~DocumentFragment}\n */\nexport function getParentTable( position ) {\n\tlet parent = position.parent;\n\n\twhile ( parent ) {\n\t\tif ( parent.name === 'table' ) {\n\t\t\treturn parent;\n\t\t}\n\n\t\tparent = parent.parent;\n\t}\n}\n\n/**\n * A common method to update the numeric value. If a value is the default one, it will be unset.\n *\n * @param {String} key Attribute key.\n * @param {*} value The new attribute value.\n * @param {module:engine/model/item~Item} item Model item on which the attribute will be set.\n * @param {module:engine/model/writer~Writer} writer\n * @param {*} defaultValue Default attribute value. If a value is lower or equal, it will be unset.\n */\nexport function updateNumericAttribute( key, value, item, writer, defaultValue = 1 ) {\n\tif ( value > defaultValue ) {\n\t\twriter.setAttribute( key, value, item );\n\t} else {\n\t\twriter.removeAttribute( key, item );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/utils\n */\n\nimport { toWidget, isWidget } from '@ckeditor/ckeditor5-widget/src/utils';\nimport { getParentTable } from './commands/utils';\n\nconst tableSymbol = Symbol( 'isTable' );\n\n/**\n * Converts a given {@link module:engine/view/element~Element} to a table widget:\n * * Adds a {@link module:engine/view/element~Element#_setCustomProperty custom property} allowing to recognize the table widget element.\n * * Calls the {@link module:widget/utils~toWidget} function with the proper element's label creator.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @param {module:engine/view/writer~Writer} writer An instance of the view writer.\n * @param {String} label The element's label. It will be concatenated with the table `alt` attribute if one is present.\n * @returns {module:engine/view/element~Element}\n */\nexport function toTableWidget( viewElement, writer ) {\n\twriter.setCustomProperty( tableSymbol, true, viewElement );\n\n\treturn toWidget( viewElement, writer, { hasSelectionHandler: true } );\n}\n\n/**\n * Checks if a given view element is a table widget.\n *\n * @param {module:engine/view/element~Element} viewElement\n * @returns {Boolean}\n */\nexport function isTableWidget( viewElement ) {\n\treturn !!viewElement.getCustomProperty( tableSymbol ) && isWidget( viewElement );\n}\n\n/**\n * Checks if a table widget is the only selected element.\n *\n * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} selection\n * @returns {Boolean}\n */\nexport function isTableWidgetSelected( selection ) {\n\tconst viewElement = selection.getSelectedElement();\n\n\treturn !!( viewElement && isTableWidget( viewElement ) );\n}\n\n/**\n * Checks if a table widget content is selected.\n *\n * @param {module:engine/view/selection~Selection|module:engine/view/documentselection~DocumentSelection} selection\n * @returns {Boolean}\n */\nexport function isTableContentSelected( selection ) {\n\tconst parentTable = getParentTable( selection.getFirstPosition() );\n\n\treturn !!( parentTable && isTableWidget( parentTable.parent ) );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/converters/downcast\n */\n\nimport ViewPosition from '@ckeditor/ckeditor5-engine/src/view/position';\nimport ViewRange from '@ckeditor/ckeditor5-engine/src/view/range';\nimport TableWalker from './../tablewalker';\nimport { toWidgetEditable } from '@ckeditor/ckeditor5-widget/src/utils';\nimport { toTableWidget } from '../utils';\n\n/**\n * Model table element to view table element conversion helper.\n *\n * This conversion helper creates the whole table element with child elements.\n *\n * @param {Object} options\n * @param {Boolean} options.asWidget If set to `true`, the downcast conversion will produce a widget.\n * @returns {Function} Conversion helper.\n */\nexport function downcastInsertTable( options = {} ) {\n\treturn dispatcher => dispatcher.on( 'insert:table', ( evt, data, conversionApi ) => {\n\t\tconst table = data.item;\n\n\t\tif ( !conversionApi.consumable.consume( table, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// Consume attributes if present to not fire attribute change downcast\n\t\tconversionApi.consumable.consume( table, 'attribute:headingRows:table' );\n\t\tconversionApi.consumable.consume( table, 'attribute:headingColumns:table' );\n\n\t\tconst asWidget = options && options.asWidget;\n\n\t\tconst figureElement = conversionApi.writer.createContainerElement( 'figure', { class: 'table' } );\n\t\tconst tableElement = conversionApi.writer.createContainerElement( 'table' );\n\t\tconversionApi.writer.insert( ViewPosition.createAt( figureElement ), tableElement );\n\n\t\tlet tableWidget;\n\n\t\tif ( asWidget ) {\n\t\t\ttableWidget = toTableWidget( figureElement, conversionApi.writer );\n\t\t}\n\n\t\tconst tableWalker = new TableWalker( table );\n\n\t\tconst tableAttributes = {\n\t\t\theadingRows: table.getAttribute( 'headingRows' ) || 0,\n\t\t\theadingColumns: table.getAttribute( 'headingColumns' ) || 0\n\t\t};\n\n\t\tfor ( const tableWalkerValue of tableWalker ) {\n\t\t\tconst { row, cell } = tableWalkerValue;\n\n\t\t\tconst tableSection = getOrCreateTableSection( getSectionName( row, tableAttributes ), tableElement, conversionApi );\n\t\t\tconst tableRow = table.getChild( row );\n\n\t\t\t// Check if row was converted\n\t\t\tconst trElement = getOrCreateTr( tableRow, row, tableSection, conversionApi );\n\n\t\t\t// Consume table cell - it will be always consumed as we convert whole table at once.\n\t\t\tconversionApi.consumable.consume( cell, 'insert' );\n\n\t\t\tconst insertPosition = ViewPosition.createAt( trElement, 'end' );\n\n\t\t\tcreateViewTableCellElement( tableWalkerValue, tableAttributes, insertPosition, conversionApi, options );\n\t\t}\n\n\t\tconst viewPosition = conversionApi.mapper.toViewPosition( data.range.start );\n\n\t\tconversionApi.mapper.bindElements( table, asWidget ? tableWidget : figureElement );\n\t\tconversionApi.writer.insert( viewPosition, asWidget ? tableWidget : figureElement );\n\t}, { priority: 'normal' } );\n}\n\n/**\n * Model row element to view `<tr>` element conversion helper.\n *\n * This conversion helper creates the whole `<tr>` element with child elements.\n *\n * @returns {Function} Conversion helper.\n */\nexport function downcastInsertRow( options = {} ) {\n\treturn dispatcher => dispatcher.on( 'insert:tableRow', ( evt, data, conversionApi ) => {\n\t\tconst tableRow = data.item;\n\n\t\tif ( !conversionApi.consumable.consume( tableRow, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst table = tableRow.parent;\n\n\t\tconst figureElement = conversionApi.mapper.toViewElement( table );\n\t\tconst tableElement = getViewTable( figureElement );\n\n\t\tconst row = table.getChildIndex( tableRow );\n\n\t\tconst tableWalker = new TableWalker( table, { startRow: row, endRow: row } );\n\n\t\tconst tableAttributes = {\n\t\t\theadingRows: table.getAttribute( 'headingRows' ) || 0,\n\t\t\theadingColumns: table.getAttribute( 'headingColumns' ) || 0\n\t\t};\n\n\t\tfor ( const tableWalkerValue of tableWalker ) {\n\t\t\tconst tableSection = getOrCreateTableSection( getSectionName( row, tableAttributes ), tableElement, conversionApi );\n\t\t\tconst trElement = getOrCreateTr( tableRow, row, tableSection, conversionApi );\n\n\t\t\t// Consume table cell - it will be always consumed as we convert whole row at once.\n\t\t\tconversionApi.consumable.consume( tableWalkerValue.cell, 'insert' );\n\n\t\t\tconst insertPosition = ViewPosition.createAt( trElement, 'end' );\n\n\t\t\tcreateViewTableCellElement( tableWalkerValue, tableAttributes, insertPosition, conversionApi, options );\n\t\t}\n\t}, { priority: 'normal' } );\n}\n\n/**\n * Model table cell element to view `<td>` or `<th>` element conversion helper.\n *\n * This conversion helper will create proper `<th>` elements for table cells that are in the heading section (heading row or column)\n * and `<td>` otherwise.\n *\n * @returns {Function} Conversion helper.\n */\nexport function downcastInsertCell( options = {} ) {\n\treturn dispatcher => dispatcher.on( 'insert:tableCell', ( evt, data, conversionApi ) => {\n\t\tconst tableCell = data.item;\n\n\t\tif ( !conversionApi.consumable.consume( tableCell, 'insert' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\t\tconst rowIndex = table.getChildIndex( tableRow );\n\n\t\tconst tableWalker = new TableWalker( table, { startRow: rowIndex, endRow: rowIndex } );\n\n\t\tconst tableAttributes = {\n\t\t\theadingRows: table.getAttribute( 'headingRows' ) || 0,\n\t\t\theadingColumns: table.getAttribute( 'headingColumns' ) || 0\n\t\t};\n\n\t\t// We need to iterate over a table in order to get proper row & column values from a walker\n\t\tfor ( const tableWalkerValue of tableWalker ) {\n\t\t\tif ( tableWalkerValue.cell === tableCell ) {\n\t\t\t\tconst trElement = conversionApi.mapper.toViewElement( tableRow );\n\t\t\t\tconst insertPosition = ViewPosition.createAt( trElement, tableRow.getChildIndex( tableCell ) );\n\n\t\t\t\tcreateViewTableCellElement( tableWalkerValue, tableAttributes, insertPosition, conversionApi, options );\n\n\t\t\t\t// No need to iterate further.\n\t\t\t\treturn;\n\t\t\t}\n\t\t}\n\t}, { priority: 'normal' } );\n}\n\n/**\n * Conversion helper that acts on heading rows table attribute change.\n *\n * This converter will:\n *\n * * Rename `<td>` to `<th>` elements or vice versa depending on headings.\n * * Create `<thead>` or `<tbody>` elements if needed.\n * * Remove empty `<thead>` or `<tbody>` if needed.\n *\n * @returns {Function} Conversion helper.\n */\nexport function downcastTableHeadingRowsChange( options = {} ) {\n\tconst asWidget = !!options.asWidget;\n\n\treturn dispatcher => dispatcher.on( 'attribute:headingRows:table', ( evt, data, conversionApi ) => {\n\t\tconst table = data.item;\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst figureElement = conversionApi.mapper.toViewElement( table );\n\t\tconst viewTable = getViewTable( figureElement );\n\n\t\tconst oldRows = data.attributeOldValue;\n\t\tconst newRows = data.attributeNewValue;\n\n\t\t// The head section has grown so move rows from <tbody> to <thead>.\n\t\tif ( newRows > oldRows ) {\n\t\t\t// Filter out only those rows that are in wrong section.\n\t\t\tconst rowsToMove = Array.from( table.getChildren() ).filter( ( { index } ) => isBetween( index, oldRows - 1, newRows ) );\n\n\t\t\tconst viewTableHead = getOrCreateTableSection( 'thead', viewTable, conversionApi );\n\t\t\tmoveViewRowsToTableSection( rowsToMove, viewTableHead, conversionApi, 'end' );\n\n\t\t\t// Rename all table cells from moved rows to 'th' as they lands in <thead>.\n\t\t\tfor ( const tableRow of rowsToMove ) {\n\t\t\t\tfor ( const tableCell of tableRow.getChildren() ) {\n\t\t\t\t\trenameViewTableCell( tableCell, 'th', conversionApi, asWidget );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Cleanup: this will remove any empty section from the view which may happen when moving all rows from a table section.\n\t\t\tremoveTableSectionIfEmpty( 'tbody', viewTable, conversionApi );\n\t\t}\n\t\t// The head section has shrunk so move rows from <thead> to <tbody>.\n\t\telse {\n\t\t\t// Filter out only those rows that are in wrong section.\n\t\t\tconst rowsToMove = Array.from( table.getChildren() )\n\t\t\t\t.filter( ( { index } ) => isBetween( index, newRows - 1, oldRows ) )\n\t\t\t\t.reverse(); // The rows will be moved from <thead> to <tbody> in reverse order at the beginning of a <tbody>.\n\n\t\t\tconst viewTableBody = getOrCreateTableSection( 'tbody', viewTable, conversionApi );\n\t\t\tmoveViewRowsToTableSection( rowsToMove, viewTableBody, conversionApi );\n\n\t\t\t// Check if cells moved from <thead> to <tbody> requires renaming to <td> as this depends on current heading columns attribute.\n\t\t\tconst tableWalker = new TableWalker( table, { startRow: newRows ? newRows - 1 : newRows, endRow: oldRows - 1 } );\n\n\t\t\tconst tableAttributes = {\n\t\t\t\theadingRows: table.getAttribute( 'headingRows' ) || 0,\n\t\t\t\theadingColumns: table.getAttribute( 'headingColumns' ) || 0\n\t\t\t};\n\n\t\t\tfor ( const tableWalkerValue of tableWalker ) {\n\t\t\t\trenameViewTableCellIfRequired( tableWalkerValue, tableAttributes, conversionApi, asWidget );\n\t\t\t}\n\n\t\t\t// Cleanup: this will remove any empty section from the view which may happen when moving all rows from a table section.\n\t\t\tremoveTableSectionIfEmpty( 'thead', viewTable, conversionApi );\n\t\t}\n\n\t\tfunction isBetween( index, lower, upper ) {\n\t\t\treturn index > lower && index < upper;\n\t\t}\n\t}, { priority: 'normal' } );\n}\n\n/**\n * Conversion helper that acts on heading columns table attribute change.\n *\n * Depending on changed attributes this converter will rename `<td` to `<th>` elements or vice versa depending of the cell column index.\n *\n * @returns {Function} Conversion helper.\n */\nexport function downcastTableHeadingColumnsChange( options = {} ) {\n\tconst asWidget = !!options.asWidget;\n\n\treturn dispatcher => dispatcher.on( 'attribute:headingColumns:table', ( evt, data, conversionApi ) => {\n\t\tconst table = data.item;\n\n\t\tif ( !conversionApi.consumable.consume( data.item, evt.name ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst tableAttributes = {\n\t\t\theadingRows: table.getAttribute( 'headingRows' ) || 0,\n\t\t\theadingColumns: table.getAttribute( 'headingColumns' ) || 0\n\t\t};\n\n\t\tconst oldColumns = data.attributeOldValue;\n\t\tconst newColumns = data.attributeNewValue;\n\n\t\tconst lastColumnToCheck = ( oldColumns > newColumns ? oldColumns : newColumns ) - 1;\n\n\t\tfor ( const tableWalkerValue of new TableWalker( table ) ) {\n\t\t\t// Skip cells that were not in heading section before and after the change.\n\t\t\tif ( tableWalkerValue.column > lastColumnToCheck ) {\n\t\t\t\tcontinue;\n\t\t\t}\n\n\t\t\trenameViewTableCellIfRequired( tableWalkerValue, tableAttributes, conversionApi, asWidget );\n\t\t}\n\t}, { priority: 'normal' } );\n}\n\n/**\n * Conversion helper that acts on a removed row.\n *\n * @returns {Function} Conversion helper.\n */\nexport function downcastRemoveRow() {\n\treturn dispatcher => dispatcher.on( 'remove:tableRow', ( evt, data, conversionApi ) => {\n\t\t// Prevent default remove converter.\n\t\tevt.stop();\n\n\t\tconst viewStart = conversionApi.mapper.toViewPosition( data.position ).getLastMatchingPosition( value => !value.item.is( 'tr' ) );\n\t\tconst viewItem = viewStart.nodeAfter;\n\t\tconst tableSection = viewItem.parent;\n\n\t\t// Remove associated <tr> from the view.\n\t\tconst removeRange = ViewRange.createOn( viewItem );\n\t\tconst removed = conversionApi.writer.remove( removeRange );\n\n\t\tfor ( const child of ViewRange.createIn( removed ).getItems() ) {\n\t\t\tconversionApi.mapper.unbindViewElement( child );\n\t\t}\n\n\t\t// Check if table section has any children left - if not remove it from the view.\n\t\tif ( !tableSection.childCount ) {\n\t\t\t// No need to unbind anything as table section is not represented in the model.\n\t\t\tconversionApi.writer.remove( ViewRange.createOn( tableSection ) );\n\t\t}\n\t}, { priority: 'higher' } );\n}\n\n// Renames a table cell in the view to a given element name.\n//\n// @param {module:engine/model/element~Element} tableCell\n// @param {String} desiredCellElementName\n// @param {Object} conversionApi\n// @param {Boolean} asWidget\nfunction renameViewTableCell( tableCell, desiredCellElementName, conversionApi, asWidget ) {\n\tconst viewCell = conversionApi.mapper.toViewElement( tableCell );\n\n\tlet renamedCell;\n\n\tif ( asWidget ) {\n\t\tconst editable = conversionApi.writer.createEditableElement( desiredCellElementName, viewCell.getAttributes() );\n\t\trenamedCell = toWidgetEditable( editable, conversionApi.writer );\n\n\t\tconversionApi.writer.insert( ViewPosition.createAfter( viewCell ), renamedCell );\n\t\tconversionApi.writer.move( ViewRange.createIn( viewCell ), ViewPosition.createAt( renamedCell ) );\n\t\tconversionApi.writer.remove( ViewRange.createOn( viewCell ) );\n\t} else {\n\t\trenamedCell = conversionApi.writer.rename( viewCell, desiredCellElementName );\n\t}\n\n\tconversionApi.mapper.bindElements( tableCell, renamedCell );\n}\n\n// Renames a table cell element in the view according to its location in the table.\n//\n// @param {module:table/tablewalker~TableWalkerValue} tableWalkerValue\n// @param {{headingColumns, headingRows}} tableAttributes\n// @param {Object} conversionApi\n// @param {Boolean} asWidget\nfunction renameViewTableCellIfRequired( tableWalkerValue, tableAttributes, conversionApi, asWidget ) {\n\tconst { cell } = tableWalkerValue;\n\n\t// Check whether current columnIndex is overlapped by table cells from previous rows.\n\tconst desiredCellElementName = getCellElementName( tableWalkerValue, tableAttributes );\n\n\tconst viewCell = conversionApi.mapper.toViewElement( cell );\n\n\t// If in single change we're converting attribute changes and inserting cell the table cell might not be inserted into view\n\t// because of child conversion is done after parent.\n\tif ( viewCell && viewCell.name !== desiredCellElementName ) {\n\t\trenameViewTableCell( cell, desiredCellElementName, conversionApi, asWidget );\n\t}\n}\n\n// Creates a table cell element in the view.\n//\n// @param {module:table/tablewalker~TableWalkerValue} tableWalkerValue\n// @param {module:engine/view/position~Position} insertPosition\n// @param {Object} conversionApi\nfunction createViewTableCellElement( tableWalkerValue, tableAttributes, insertPosition, conversionApi, options ) {\n\tconst asWidget = options && options.asWidget;\n\tconst cellElementName = getCellElementName( tableWalkerValue, tableAttributes );\n\n\tconst cellElement = asWidget ?\n\t\ttoWidgetEditable( conversionApi.writer.createEditableElement( cellElementName ), conversionApi.writer ) :\n\t\tconversionApi.writer.createContainerElement( cellElementName );\n\n\tconst tableCell = tableWalkerValue.cell;\n\n\tconversionApi.mapper.bindElements( tableCell, cellElement );\n\tconversionApi.writer.insert( insertPosition, cellElement );\n}\n\n// Creates or returns an existing `<tr>` element from the view.\n//\n// @param {module:engine/view/element~Element} tableRow\n// @param {Number} rowIndex\n// @param {module:engine/view/element~Element} tableSection\n// @param {Object} conversionApi\n// @returns {module:engine/view/element~Element}\nfunction getOrCreateTr( tableRow, rowIndex, tableSection, conversionApi ) {\n\tlet trElement = conversionApi.mapper.toViewElement( tableRow );\n\n\tif ( !trElement ) {\n\t\t// Will always consume since we're converting <tableRow> element from a parent <table>.\n\t\tconversionApi.consumable.consume( tableRow, 'insert' );\n\n\t\ttrElement = conversionApi.writer.createContainerElement( 'tr' );\n\t\tconversionApi.mapper.bindElements( tableRow, trElement );\n\n\t\tconst headingRows = tableRow.parent.getAttribute( 'headingRows' ) || 0;\n\t\tconst offset = headingRows > 0 && rowIndex >= headingRows ? rowIndex - headingRows : rowIndex;\n\n\t\tconst position = ViewPosition.createAt( tableSection, offset );\n\t\tconversionApi.writer.insert( position, trElement );\n\t}\n\n\treturn trElement;\n}\n\n// Returns `th` for heading cells and `td` for other cells for the current table walker value.\n//\n// @param {module:table/tablewalker~TableWalkerValue} tableWalkerValue\n// @param {{headingColumns, headingRows}} tableAttributes\n// @returns {String}\nfunction getCellElementName( tableWalkerValue, tableAttributes ) {\n\tconst { row, column } = tableWalkerValue;\n\tconst { headingColumns, headingRows } = tableAttributes;\n\n\t// Column heading are all tableCells in the first `columnHeading` rows.\n\tconst isColumnHeading = headingRows && headingRows > row;\n\n\t// So a whole row gets <th> element.\n\tif ( isColumnHeading ) {\n\t\treturn 'th';\n\t}\n\n\t// Row heading are tableCells which columnIndex is lower then headingColumns.\n\tconst isRowHeading = headingColumns && headingColumns > column;\n\n\treturn isRowHeading ? 'th' : 'td';\n}\n\n// Returns the table section name for the current table walker value.\n//\n// @param {Number} row\n// @param {{headingColumns, headingRows}} tableAttributes\n// @returns {String}\nfunction getSectionName( row, tableAttributes ) {\n\treturn row < tableAttributes.headingRows ? 'thead' : 'tbody';\n}\n\n// Creates or returns an existing `<tbody>` or `<thead>` element witch caching.\n//\n// @param {String} sectionName\n// @param {module:engine/view/element~Element} viewTable\n// @param {Object} conversionApi\n// @param {Object} cachedTableSection An object that stores cached elements.\n// @returns {module:engine/view/containerelement~ContainerElement}\nfunction getOrCreateTableSection( sectionName, viewTable, conversionApi ) {\n\tconst viewTableSection = getExistingTableSectionElement( sectionName, viewTable );\n\n\treturn viewTableSection ? viewTableSection : createTableSection( sectionName, viewTable, conversionApi );\n}\n\n// Finds an existing `<tbody>` or `<thead>` element or returns undefined.\n//\n// @param {String} sectionName\n// @param {module:engine/view/element~Element} tableElement\n// @param {Object} conversionApi\nfunction getExistingTableSectionElement( sectionName, tableElement ) {\n\tfor ( const tableSection of tableElement.getChildren() ) {\n\t\tif ( tableSection.name == sectionName ) {\n\t\t\treturn tableSection;\n\t\t}\n\t}\n}\n\n// Creates a table section at the end of the table.\n//\n// @param {String} sectionName\n// @param {module:engine/view/element~Element} tableElement\n// @param {Object} conversionApi\n// @returns {module:engine/view/containerelement~ContainerElement}\nfunction createTableSection( sectionName, tableElement, conversionApi ) {\n\tconst tableChildElement = conversionApi.writer.createContainerElement( sectionName );\n\n\tconversionApi.writer.insert( ViewPosition.createAt( tableElement, sectionName == 'tbody' ? 'end' : 'start' ), tableChildElement );\n\n\treturn tableChildElement;\n}\n\n// Removes an existing `<tbody>` or `<thead>` element if it is empty.\n//\n// @param {String} sectionName\n// @param {module:engine/view/element~Element} tableElement\n// @param {Object} conversionApi\nfunction removeTableSectionIfEmpty( sectionName, tableElement, conversionApi ) {\n\tconst tableSection = getExistingTableSectionElement( sectionName, tableElement );\n\n\tif ( tableSection && tableSection.childCount === 0 ) {\n\t\tconversionApi.writer.remove( ViewRange.createOn( tableSection ) );\n\t}\n}\n\n// Moves view table rows associated with passed model rows to the provided table section element.\n//\n// @param {Array.<module:engine/model/element~Element>} rowsToMove\n// @param {module:engine/view/element~Element} viewTableSection\n// @param {Object} conversionApi\n// @param {Number|'end'|'before'|'after'} [offset=0] Offset or one of the flags.\nfunction moveViewRowsToTableSection( rowsToMove, viewTableSection, conversionApi, offset ) {\n\tfor ( const tableRow of rowsToMove ) {\n\t\tconst viewTableRow = conversionApi.mapper.toViewElement( tableRow );\n\n\t\tconversionApi.writer.move( ViewRange.createOn( viewTableRow ), ViewPosition.createAt( viewTableSection, offset ) );\n\t}\n}\n\n// Properly finds '<table>' element inside `<figure>` widget.\n//\n// @param {module:engine/view/element~Element} viewFigure\nfunction getViewTable( viewFigure ) {\n\tfor ( const child of viewFigure.getChildren() ) {\n\t\tif ( child.name === 'table' ) {\n\t\t\treturn child;\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/tableutils\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\n\nimport TableWalker from './tablewalker';\nimport { getParentTable, updateNumericAttribute } from './commands/utils';\n\n/**\n * The table utilities plugin.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class TableUtils extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'TableUtils';\n\t}\n\n\t/**\n\t * Returns the table cell location as an object with table row and table column indexes.\n\t *\n\t * For instance in the table below:\n\t *\n\t *\t\t    0   1   2   3\n\t *\t\t  +---+---+---+---+\n\t *\t\t0 | a     | b | c |\n\t *\t\t  +       +   +---+\n\t *\t\t1 |       |   | d |\n\t *\t\t  +---+---+   +---+\n\t *\t\t2 | e     |   | f |\n\t *\t\t  +---+---+---+---+\n\t *\n\t * the method will return:\n\t *\n\t *\t\tconst cellA = table.getNodeByPath( [ 0, 0 ] );\n\t *\t\teditor.plugins.get( 'TableUtils' ).getCellLocation( cellA );\n\t *\t\t// will return { row: 0, column: 0 }\n\t *\n\t *\t\tconst cellD = table.getNodeByPath( [ 1, 0 ] );\n\t *\t\teditor.plugins.get( 'TableUtils' ).getCellLocation( cellD );\n\t *\t\t// will return { row: 1, column: 3 }\n\t *\n\t * @param {module:engine/model/element~Element} tableCell\n\t * @returns {Object} Returns a `{row, column}` object.\n\t */\n\tgetCellLocation( tableCell ) {\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\n\t\tconst rowIndex = table.getChildIndex( tableRow );\n\n\t\tconst tableWalker = new TableWalker( table, { startRow: rowIndex, endRow: rowIndex } );\n\n\t\tfor ( const { cell, row, column } of tableWalker ) {\n\t\t\tif ( cell === tableCell ) {\n\t\t\t\treturn { row, column };\n\t\t\t}\n\t\t}\n\t}\n\n\t/**\n\t * Creates an empty table at a given position.\n\t *\n\t * @param {module:engine/model/position~Position} position The position where the table will be inserted.\n\t * @param {Number} rows The number of rows to create.\n\t * @param {Number} columns The number of columns to create.\n\t * @returns {module:engine/model/element~Element} The created table element.\n\t */\n\tcreateTable( position, rows, columns ) {\n\t\tconst model = this.editor.model;\n\n\t\treturn model.change( writer => {\n\t\t\tconst table = writer.createElement( 'table' );\n\n\t\t\twriter.insert( table, position );\n\n\t\t\tcreateEmptyRows( writer, table, 0, rows, columns );\n\n\t\t\treturn table;\n\t\t} );\n\t}\n\n\t/**\n\t * Inserts rows into a table.\n\t *\n\t *\t\teditor.plugins.get( 'TableUtils' ).insertRows( table, { at: 1, rows: 2 } );\n\t *\n\t * Assuming the table on the left, the above code will transform it to the table on the right:\n\t *\n\t *\t\trow index\n\t *\t\t  0 +---+---+---+       `at` = 1,      +---+---+---+ 0\n\t *\t\t    | a | b | c |       `rows` = 2,    | a | b | c |\n\t *\t\t  1 +   +---+---+   <-- insert here    +   +---+---+ 1\n\t *\t\t    |   | d | e |                      |   |   |   |\n\t *\t\t  2 +   +---+---+       will give:     +   +---+---+ 2\n\t *\t\t    |   | f | g |                      |   |   |   |\n\t *\t\t  3 +---+---+---+                      +   +---+---+ 3\n\t *\t\t                                       |   | d | e |\n\t *\t\t                                       +---+---+---+ 4\n\t *\t\t                                       +   + f | g |\n\t *\t\t                                       +---+---+---+ 5\n\t *\n\t * @param {module:engine/model/element~Element} table The table model element where the rows will be inserted.\n\t * @param {Object} options\n\t * @param {Number} [options.at=0] Row index at which the rows will be inserted.\n\t * @param {Number} [options.rows=1] The number of rows to insert.\n\t */\n\tinsertRows( table, options = {} ) {\n\t\tconst model = this.editor.model;\n\n\t\tconst insertAt = options.at || 0;\n\t\tconst rowsToInsert = options.rows || 1;\n\n\t\tmodel.change( writer => {\n\t\t\tconst headingRows = table.getAttribute( 'headingRows' ) || 0;\n\n\t\t\t// Inserting rows inside heading section requires to update `headingRows` attribute as the heading section will grow.\n\t\t\tif ( headingRows > insertAt ) {\n\t\t\t\twriter.setAttribute( 'headingRows', headingRows + rowsToInsert, table );\n\t\t\t}\n\n\t\t\t// Inserting at the end and at the beginning of a table doesn't require to calculate anything special.\n\t\t\tif ( insertAt === 0 || insertAt === table.childCount ) {\n\t\t\t\tcreateEmptyRows( writer, table, insertAt, rowsToInsert, this.getColumns( table ) );\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\t// Iterate over all rows above inserted rows in order to check for rowspanned cells.\n\t\t\tconst tableIterator = new TableWalker( table, { endRow: insertAt } );\n\n\t\t\t// Will hold number of cells needed to insert in created rows.\n\t\t\t// The number might be different then table cell width when there are rowspanned cells.\n\t\t\tlet cellsToInsert = 0;\n\n\t\t\tfor ( const { row, rowspan, colspan, cell } of tableIterator ) {\n\t\t\t\tconst isBeforeInsertedRow = row < insertAt;\n\t\t\t\tconst overlapsInsertedRow = row + rowspan > insertAt;\n\n\t\t\t\tif ( isBeforeInsertedRow && overlapsInsertedRow ) {\n\t\t\t\t\t// This cell overlaps inserted rows so we need to expand it further.\n\t\t\t\t\twriter.setAttribute( 'rowspan', rowspan + rowsToInsert, cell );\n\t\t\t\t}\n\n\t\t\t\t// Calculate how many cells to insert based on the width of cells in a row at insert position.\n\t\t\t\t// It might be lower then table width as some cells might overlaps inserted row.\n\t\t\t\t// In the table above the cell 'a' overlaps inserted row so only two empty cells are need to be created.\n\t\t\t\tif ( row === insertAt ) {\n\t\t\t\t\tcellsToInsert += colspan;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tcreateEmptyRows( writer, table, insertAt, rowsToInsert, cellsToInsert );\n\t\t} );\n\t}\n\n\t/**\n\t * Inserts columns into a table.\n\t *\n\t *\t\teditor.plugins.get( 'TableUtils' ).insertColumns( table, { at: 1, columns: 2 } );\n\t *\n\t * Assuming the table on the left, the above code will transform it to the table on the right:\n\t *\n\t *\t\t0   1   2   3                   0   1   2   3   4   5\n\t *\t\t+---+---+---+                   +---+---+---+---+---+\n\t *\t\t| a     | b |                   | a             | b |\n\t *\t\t+       +---+                   +               +---+\n\t *\t\t|       | c |                   |               | c |\n\t *\t\t+---+---+---+     will give:    +---+---+---+---+---+\n\t *\t\t| d | e | f |                   | d |   |   | e | f |\n\t *\t\t+---+   +---+                   +---+---+---+  +---+\n\t *\t\t| g |   | h |                   | g |   |   |   | h |\n\t *\t\t+---+---+---+                   +---+---+---+---+---+\n\t *\t\t| i         |                   | i                 |\n\t *\t\t+---+---+---+                   +---+---+---+---+---+\n\t *\t\t    ^---- insert here, `at` = 1, `columns` = 2\n\t *\n\t * @param {module:engine/model/element~Element} table The table model element where the columns will be inserted.\n\t * @param {Object} options\n\t * @param {Number} [options.at=0] Column index at which the columns will be inserted.\n\t * @param {Number} [options.columns=1] The number of columns to insert.\n\t */\n\tinsertColumns( table, options = {} ) {\n\t\tconst model = this.editor.model;\n\n\t\tconst insertAt = options.at || 0;\n\t\tconst columnsToInsert = options.columns || 1;\n\n\t\tmodel.change( writer => {\n\t\t\tconst headingColumns = table.getAttribute( 'headingColumns' );\n\n\t\t\t// Inserting columns inside heading section requires to update `headingColumns` attribute as the heading section will grow.\n\t\t\tif ( insertAt < headingColumns ) {\n\t\t\t\twriter.setAttribute( 'headingColumns', headingColumns + columnsToInsert, table );\n\t\t\t}\n\n\t\t\tconst tableColumns = this.getColumns( table );\n\n\t\t\t// Inserting at the end and at the beginning of a table doesn't require to calculate anything special.\n\t\t\tif ( insertAt === 0 || tableColumns === insertAt ) {\n\t\t\t\tfor ( const tableRow of table.getChildren() ) {\n\t\t\t\t\tcreateCells( columnsToInsert, writer, Position.createAt( tableRow, insertAt ? 'end' : 0 ) );\n\t\t\t\t}\n\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\tconst tableWalker = new TableWalker( table, { column: insertAt, includeSpanned: true } );\n\n\t\t\tfor ( const { row, column, cell, colspan, rowspan, cellIndex } of tableWalker ) {\n\t\t\t\t// When iterating over column the table walker outputs either:\n\t\t\t\t// - cells at given column index (cell \"e\" from method docs),\n\t\t\t\t// - spanned columns (spanned cell from row between cells \"g\" and \"h\" - spanned by \"e\", only if `includeSpanned: true`),\n\t\t\t\t// - or a cell from the same row which spans over this column (cell \"a\").\n\n\t\t\t\tif ( column !== insertAt ) {\n\t\t\t\t\t// If column is different than `insertAt`, it is a cell that spans over an inserted column (cell \"a\" & \"i\").\n\t\t\t\t\t// For such cells expand them by a number of columns inserted.\n\t\t\t\t\twriter.setAttribute( 'colspan', colspan + columnsToInsert, cell );\n\n\t\t\t\t\t// The `includeSpanned` option will output the \"empty\"/spanned column so skip this row already.\n\t\t\t\t\ttableWalker.skipRow( row );\n\n\t\t\t\t\t// This cell will overlap cells in rows below so skip them also (because of `includeSpanned` option) - (cell \"a\")\n\t\t\t\t\tif ( rowspan > 1 ) {\n\t\t\t\t\t\tfor ( let i = row + 1; i < row + rowspan; i++ ) {\n\t\t\t\t\t\t\ttableWalker.skipRow( i );\n\t\t\t\t\t\t}\n\t\t\t\t\t}\n\t\t\t\t} else {\n\t\t\t\t\t// It's either cell at this column index or spanned cell by a rowspanned cell from row above.\n\t\t\t\t\t// In table above it's cell \"e\" and a spanned position from row below (empty cell between cells \"g\" and \"h\")\n\t\t\t\t\tconst insertPosition = Position.createFromParentAndOffset( table.getChild( row ), cellIndex );\n\n\t\t\t\t\tcreateCells( columnsToInsert, writer, insertPosition );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Divides a table cell vertically into several ones.\n\t *\n\t * The cell will be visually split into more cells by updating colspans of other cells in a column\n\t * and inserting cells (columns) after that cell.\n\t *\n\t * In the table below, if cell \"a\" is split to 3 cells:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a | b | c |\n\t *\t\t+---+---+---+\n\t *\t\t| d | e | f |\n\t *\t\t+---+---+---+\n\t *\n\t * it will result in the table below:\n\t *\n\t *\t\t+---+---+---+---+---+\n\t *\t\t| a |   |   | b | c |\n\t *\t\t+---+---+---+---+---+\n\t *\t\t| d         | e | f |\n\t *\t\t+---+---+---+---+---+\n\t *\n\t * So cell \"d\" will get its `colspan` updated to `3` and 2 cells will be added (2 columns will be created).\n\t *\n\t * Splitting a cell that already has a `colspan` attribute set will distribute the cell `colspan` evenly and the remainder\n\t * will be left to the original cell:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a         |\n\t *\t\t+---+---+---+\n\t *\t\t| b | c | d |\n\t *\t\t+---+---+---+\n\t *\n\t * Splitting cell \"a\" with `colspan=3` to 2 cells will create 1 cell with a `colspan=a` and cell \"a\" that will have `colspan=2`:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a     |   |\n\t *\t\t+---+---+---+\n\t *\t\t| b | c | d |\n\t *\t\t+---+---+---+\n\t *\n\t * @param {module:engine/model/element~Element} tableCell\n\t * @param {Number} numberOfCells\n\t */\n\tsplitCellVertically( tableCell, numberOfCells = 2 ) {\n\t\tconst model = this.editor.model;\n\t\tconst table = getParentTable( tableCell );\n\n\t\tconst rowspan = parseInt( tableCell.getAttribute( 'rowspan' ) || 1 );\n\t\tconst colspan = parseInt( tableCell.getAttribute( 'colspan' ) || 1 );\n\n\t\tmodel.change( writer => {\n\t\t\t// First check - the cell spans over multiple rows so before doing anything else just split this cell.\n\t\t\tif ( colspan > 1 ) {\n\t\t\t\t// Get spans of new (inserted) cells and span to update of split cell.\n\t\t\t\tconst { newCellsSpan, updatedSpan } = breakSpanEvenly( colspan, numberOfCells );\n\n\t\t\t\tupdateNumericAttribute( 'colspan', updatedSpan, tableCell, writer );\n\n\t\t\t\t// Each inserted cell will have the same attributes:\n\t\t\t\tconst newCellsAttributes = {};\n\n\t\t\t\t// Do not store default value in the model.\n\t\t\t\tif ( newCellsSpan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.colspan = newCellsSpan;\n\t\t\t\t}\n\n\t\t\t\t// Copy rowspan of split cell.\n\t\t\t\tif ( rowspan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.rowspan = rowspan;\n\t\t\t\t}\n\n\t\t\t\tconst cellsToInsert = colspan > numberOfCells ? numberOfCells - 1 : colspan - 1;\n\t\t\t\tcreateCells( cellsToInsert, writer, Position.createAfter( tableCell ), newCellsAttributes );\n\t\t\t}\n\n\t\t\t// Second check - the cell has colspan of 1 or we need to create more cells then the currently one spans over.\n\t\t\tif ( colspan < numberOfCells ) {\n\t\t\t\tconst cellsToInsert = numberOfCells - colspan;\n\n\t\t\t\t// First step: expand cells on the same column as split cell.\n\t\t\t\tconst tableMap = [ ...new TableWalker( table ) ];\n\n\t\t\t\t// Get the column index of split cell.\n\t\t\t\tconst { column: splitCellColumn } = tableMap.find( ( { cell } ) => cell === tableCell );\n\n\t\t\t\t// Find cells which needs to be expanded vertically - those on the same column or those that spans over split cell's column.\n\t\t\t\tconst cellsToUpdate = tableMap.filter( ( { cell, colspan, column } ) => {\n\t\t\t\t\tconst isOnSameColumn = cell !== tableCell && column === splitCellColumn;\n\t\t\t\t\tconst spansOverColumn = ( column < splitCellColumn && column + colspan > splitCellColumn );\n\n\t\t\t\t\treturn isOnSameColumn || spansOverColumn;\n\t\t\t\t} );\n\n\t\t\t\t// Expand cells vertically.\n\t\t\t\tfor ( const { cell, colspan } of cellsToUpdate ) {\n\t\t\t\t\twriter.setAttribute( 'colspan', colspan + cellsToInsert, cell );\n\t\t\t\t}\n\n\t\t\t\t// Second step: create columns after split cell.\n\n\t\t\t\t// Each inserted cell will have the same attributes:\n\t\t\t\tconst newCellsAttributes = {};\n\n\t\t\t\t// Do not store default value in the model.\n\n\t\t\t\t// Copy rowspan of split cell.\n\t\t\t\tif ( rowspan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.rowspan = rowspan;\n\t\t\t\t}\n\n\t\t\t\tcreateCells( cellsToInsert, writer, Position.createAfter( tableCell ), newCellsAttributes );\n\n\t\t\t\tconst headingColumns = table.getAttribute( 'headingColumns' ) || 0;\n\n\t\t\t\t// Update heading section if split cell is in heading section.\n\t\t\t\tif ( headingColumns > splitCellColumn ) {\n\t\t\t\t\tupdateNumericAttribute( 'headingColumns', headingColumns + cellsToInsert, table, writer );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Divides a table cell horizontally into several ones.\n\t *\n\t * The cell will be visually split into more cells by updating rowspans of other cells in the row and inserting rows with a single cell\n\t * below.\n\t *\n\t * If in the table below cell \"b\" is split to 3 cells:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a | b | c |\n\t *\t\t+---+---+---+\n\t *\t\t| d | e | f |\n\t *\t\t+---+---+---+\n\t *\n\t * It will result in the table below:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a | b | c |\n\t *\t\t+   +---+   +\n\t *\t\t|   |   |   |\n\t *\t\t+   +---+   +\n\t *\t\t|   |   |   |\n\t *\t\t+---+---+---+\n\t *\t\t| d | e | f |\n\t *\t\t+---+---+---+\n\t *\n\t * So cells \"a\" and \"b\" will get their `rowspan` updated to `3` and 2 rows with a single cell will be added.\n\t *\n\t * Splitting a cell that already has a `rowspan` attribute set will distribute the cell `rowspan` evenly and the remainder\n\t * will be left to the original cell:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a | b | c |\n\t *\t\t+   +---+---+\n\t *\t\t|   | d | e |\n\t *\t\t+   +---+---+\n\t *\t\t|   | f | g |\n\t *\t\t+   +---+---+\n\t *\t\t|   | h | i |\n\t *\t\t+---+---+---+\n\t *\n\t * Splitting cell \"a\" with `rowspan=4` to 3 cells will create 2 cells with a `rowspan=1` and cell \"a\" will have `rowspan=2`:\n\t *\n\t *\t\t+---+---+---+\n\t *\t\t| a | b | c |\n\t *\t\t+   +---+---+\n\t *\t\t|   | d | e |\n\t *\t\t+---+---+---+\n\t *\t\t|   | f | g |\n\t *\t\t+---+---+---+\n\t *\t\t|   | h | i |\n\t *\t\t+---+---+---+\n\t *\n\t * @param {module:engine/model/element~Element} tableCell\n\t * @param {Number} numberOfCells\n\t */\n\tsplitCellHorizontally( tableCell, numberOfCells = 2 ) {\n\t\tconst model = this.editor.model;\n\n\t\tconst table = getParentTable( tableCell );\n\t\tconst splitCellRow = table.getChildIndex( tableCell.parent );\n\n\t\tconst rowspan = parseInt( tableCell.getAttribute( 'rowspan' ) || 1 );\n\t\tconst colspan = parseInt( tableCell.getAttribute( 'colspan' ) || 1 );\n\n\t\tmodel.change( writer => {\n\t\t\t// First check - the cell spans over multiple rows so before doing anything else just split this cell.\n\t\t\tif ( rowspan > 1 ) {\n\t\t\t\t// Cache table map before updating table.\n\t\t\t\tconst tableMap = [ ...new TableWalker( table, {\n\t\t\t\t\tstartRow: splitCellRow,\n\t\t\t\t\tendRow: splitCellRow + rowspan - 1,\n\t\t\t\t\tincludeSpanned: true\n\t\t\t\t} ) ];\n\n\t\t\t\t// Get spans of new (inserted) cells and span to update of split cell.\n\t\t\t\tconst { newCellsSpan, updatedSpan } = breakSpanEvenly( rowspan, numberOfCells );\n\n\t\t\t\tupdateNumericAttribute( 'rowspan', updatedSpan, tableCell, writer );\n\n\t\t\t\tconst { column: cellColumn } = tableMap.find( ( { cell } ) => cell === tableCell );\n\n\t\t\t\t// Each inserted cell will have the same attributes:\n\t\t\t\tconst newCellsAttributes = {};\n\n\t\t\t\t// Do not store default value in the model.\n\t\t\t\tif ( newCellsSpan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.rowspan = newCellsSpan;\n\t\t\t\t}\n\n\t\t\t\t// Copy colspan of split cell.\n\t\t\t\tif ( colspan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.colspan = colspan;\n\t\t\t\t}\n\n\t\t\t\tfor ( const { column, row, cellIndex } of tableMap ) {\n\t\t\t\t\t// As both newly created cells and the split cell might have rowspan,\n\t\t\t\t\t// the insertion of new cells must go to appropriate rows:\n\t\t\t\t\t//\n\t\t\t\t\t// 1. It's a row after split cell + it's height.\n\t\t\t\t\tconst isAfterSplitCell = row >= splitCellRow + updatedSpan;\n\t\t\t\t\t// 2. Is on the same column.\n\t\t\t\t\tconst isOnSameColumn = column === cellColumn;\n\t\t\t\t\t// 3. And it's row index is after previous cell height.\n\t\t\t\t\tconst isInEvenlySplitRow = ( row + splitCellRow + updatedSpan ) % newCellsSpan === 0;\n\n\t\t\t\t\tif ( isAfterSplitCell && isOnSameColumn && isInEvenlySplitRow ) {\n\t\t\t\t\t\tconst position = Position.createFromParentAndOffset( table.getChild( row ), cellIndex );\n\n\t\t\t\t\t\twriter.insertElement( 'tableCell', newCellsAttributes, position );\n\t\t\t\t\t}\n\t\t\t\t}\n\t\t\t}\n\n\t\t\t// Second check - the cell has rowspan of 1 or we need to create more cells than the current cell spans over.\n\t\t\tif ( rowspan < numberOfCells ) {\n\t\t\t\t// We already split the cell in check one so here we split to the remaining number of cells only.\n\t\t\t\tconst cellsToInsert = numberOfCells - rowspan;\n\n\t\t\t\t// This check is needed since we need to check if there are any cells from previous rows than spans over this cell's row.\n\t\t\t\tconst tableMap = [ ...new TableWalker( table, { startRow: 0, endRow: splitCellRow } ) ];\n\n\t\t\t\t// First step: expand cells.\n\t\t\t\tfor ( const { cell, rowspan, row } of tableMap ) {\n\t\t\t\t\t// Expand rowspan of cells that are either:\n\t\t\t\t\t// - on the same row as current cell,\n\t\t\t\t\t// - or are below split cell row and overlaps that row.\n\t\t\t\t\tif ( cell !== tableCell && row + rowspan > splitCellRow ) {\n\t\t\t\t\t\tconst rowspanToSet = rowspan + cellsToInsert;\n\n\t\t\t\t\t\twriter.setAttribute( 'rowspan', rowspanToSet, cell );\n\t\t\t\t\t}\n\t\t\t\t}\n\n\t\t\t\t// Second step: create rows with single cell below split cell.\n\t\t\t\tconst newCellsAttributes = {};\n\n\t\t\t\t// Copy colspan of split cell.\n\t\t\t\tif ( colspan > 1 ) {\n\t\t\t\t\tnewCellsAttributes.colspan = colspan;\n\t\t\t\t}\n\n\t\t\t\tcreateEmptyRows( writer, table, splitCellRow + 1, cellsToInsert, 1, newCellsAttributes );\n\n\t\t\t\t// Update heading section if split cell is in heading section.\n\t\t\t\tconst headingRows = table.getAttribute( 'headingRows' ) || 0;\n\n\t\t\t\tif ( headingRows > splitCellRow ) {\n\t\t\t\t\tupdateNumericAttribute( 'headingRows', headingRows + cellsToInsert, table, writer );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Returns the number of columns for a given table.\n\t *\n\t *\t\teditor.plugins.get( 'TableUtils' ).getColumns( table );\n\t *\n\t * @param {module:engine/model/element~Element} table The table to analyze.\n\t * @returns {Number}\n\t */\n\tgetColumns( table ) {\n\t\t// Analyze first row only as all the rows should have the same width.\n\t\tconst row = table.getChild( 0 );\n\n\t\treturn [ ...row.getChildren() ].reduce( ( columns, row ) => {\n\t\t\tconst columnWidth = parseInt( row.getAttribute( 'colspan' ) || 1 );\n\n\t\t\treturn columns + columnWidth;\n\t\t}, 0 );\n\t}\n}\n\n// Creates empty rows at the given index in an existing table.\n//\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/element~Element} table\n// @param {Number} insertAt Row index of row insertion.\n// @param {Number} rows Number of rows to create.\n// @param {Number} tableCellToInsert Number of cells to insert in each row.\nfunction createEmptyRows( writer, table, insertAt, rows, tableCellToInsert, attributes = {} ) {\n\tfor ( let i = 0; i < rows; i++ ) {\n\t\tconst tableRow = writer.createElement( 'tableRow' );\n\n\t\twriter.insert( tableRow, table, insertAt );\n\n\t\tcreateCells( tableCellToInsert, writer, Position.createAt( tableRow, 'end' ), attributes );\n\t}\n}\n\n// Creates cells at a given position.\n//\n// @param {Number} columns Number of columns to create\n// @param {module:engine/model/writer~Writer} writer\n// @param {module:engine/model/position~Position} insertPosition\nfunction createCells( cells, writer, insertPosition, attributes = {} ) {\n\tfor ( let i = 0; i < cells; i++ ) {\n\t\twriter.insertElement( 'tableCell', attributes, insertPosition );\n\t}\n}\n\n// Evenly distributes the span of a cell to a number of provided cells.\n// The resulting spans will always be integer values.\n//\n// For instance breaking a span of 7 into 3 cells will return:\n//\n//\t\t{ newCellsSpan: 2, updatedSpan: 3 }\n//\n// as two cells will have a span of 2 and the remainder will go the first cell so its span will change to 3.\n//\n// @param {Number} span Span value do break.\n// @param {Number} numberOfCells Number of resulting spans.\n// @returns {{newCellsSpan: Number, updatedSpan: Number}}\nfunction breakSpanEvenly( span, numberOfCells ) {\n\tif ( span < numberOfCells ) {\n\t\treturn { newCellsSpan: 1, updatedSpan: 1 };\n\t}\n\n\tconst newCellsSpan = Math.floor( span / numberOfCells );\n\tconst updatedSpan = ( span - newCellsSpan * numberOfCells ) + newCellsSpan;\n\n\treturn { newCellsSpan, updatedSpan };\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/inserttablecommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\nimport TableUtils from '../tableutils';\n\n/**\n * The insert table command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'insertTable'` editor command.\n *\n * To insert a table at the current selection, execute the command and specify the dimensions:\n *\n *\t\teditor.execute( 'insertTable', { rows: 20, columns: 5 } );\n *\n * @extends module:core/command~Command\n */\nexport default class InsertTableCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\t\tconst schema = model.schema;\n\n\t\tconst validParent = getInsertTableParent( selection.getFirstPosition() );\n\n\t\tthis.isEnabled = schema.checkChild( validParent, 'table' );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * Inserts a table with the given number of rows and columns into the editor.\n\t *\n\t * @param {Object} options\n\t * @param {Number} [options.rows=2] The number of rows to create in the inserted table.\n\t * @param {Number} [options.columns=2] The number of columns to create in the inserted table.\n\t * @fires execute\n\t */\n\texecute( options = {} ) {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\t\tconst tableUtils = this.editor.plugins.get( TableUtils );\n\n\t\tconst rows = parseInt( options.rows ) || 2;\n\t\tconst columns = parseInt( options.columns ) || 2;\n\n\t\tconst firstPosition = selection.getFirstPosition();\n\n\t\tconst isRoot = firstPosition.parent === firstPosition.root;\n\t\tconst insertPosition = isRoot ? Position.createAt( firstPosition ) : Position.createAfter( firstPosition.parent );\n\n\t\tmodel.change( writer => {\n\t\t\tconst table = tableUtils.createTable( insertPosition, rows, columns );\n\n\t\t\twriter.setSelection( Position.createAt( table.getChild( 0 ).getChild( 0 ) ) );\n\t\t} );\n\t}\n}\n\n// Returns valid parent to insert table\n//\n// @param {module:engine/model/position} position\nfunction getInsertTableParent( position ) {\n\tconst parent = position.parent;\n\n\treturn parent === parent.root ? parent : parent.parent;\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/insertrowcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getParentTable } from './utils';\nimport TableUtils from '../tableutils';\n\n/**\n * The insert row command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'insertTableRowBelow'` and\n * `'insertTableRowAbove'` editor commands.\n *\n * To insert a row below the selected cell, execute the following command:\n *\n *\t\teditor.execute( 'insertTableRowBelow' );\n *\n * To insert a row above the selected cell, execute the following command:\n *\n *\t\teditor.execute( 'insertTableRowAbove' );\n *\n * @extends module:core/command~Command\n */\nexport default class InsertRowCommand extends Command {\n\t/**\n\t * Creates a new `InsertRowCommand` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor on which this command will be used.\n\t * @param {Object} options\n\t * @param {String} [options.order=\"below\"] The order of insertion relative to the row in which the caret is located.\n\t * Possible values: `\"above\"` and `\"below\"`.\n\t */\n\tconstructor( editor, options = {} ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The order of insertion relative to the row in which the caret is located.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:table/commands/insertrowcommand~InsertRowCommand#order\n\t\t */\n\t\tthis.order = options.order || 'below';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst selection = this.editor.model.document.selection;\n\n\t\tconst tableParent = getParentTable( selection.getFirstPosition() );\n\n\t\tthis.isEnabled = !!tableParent;\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * Depending on the command's {@link #order} value, it inserts a row `'below'` or `'above'` the row in which selection is set.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\t\tconst tableUtils = editor.plugins.get( TableUtils );\n\n\t\tconst tableCell = selection.getFirstPosition().parent;\n\t\tconst table = getParentTable( selection.getFirstPosition() );\n\n\t\tconst row = table.getChildIndex( tableCell.parent );\n\t\tconst insertAt = this.order === 'below' ? row + 1 : row;\n\n\t\ttableUtils.insertRows( table, { rows: 1, at: insertAt } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/insertcolumncommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport { getParentTable } from './utils';\nimport TableUtils from '../tableutils';\n\n/**\n * The insert column command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'insertTableColumnBefore'` and\n * `'insertTableColumnAfter'` editor commands.\n *\n * To insert a column before the selected cell, execute the following command:\n *\n *\t\teditor.execute( 'insertTableColumnBefore' );\n *\n * To insert a column after the selected cell, execute the following command:\n *\n *\t\teditor.execute( 'insertTableColumnAfter' );\n *\n * @extends module:core/command~Command\n */\nexport default class InsertColumnCommand extends Command {\n\t/**\n\t * Creates a new `InsertColumnCommand` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor An editor on which this command will be used.\n\t * @param {Object} options\n\t * @param {String} [options.order=\"after\"] The order of insertion relative to the column in which the caret is located.\n\t * Possible values: `\"after\"` and `\"before\"`.\n\t */\n\tconstructor( editor, options = {} ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The order of insertion relative to the column in which the caret is located.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} module:table/commands/insertcolumncommand~InsertColumnCommand#order\n\t\t */\n\t\tthis.order = options.order || 'after';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst selection = this.editor.model.document.selection;\n\n\t\tconst tableParent = getParentTable( selection.getFirstPosition() );\n\n\t\tthis.isEnabled = !!tableParent;\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * Depending on the command's {@link #order} value, it inserts a column `'before'` or `'after'` the column in which the selection is\n\t * set.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\t\tconst tableUtils = editor.plugins.get( TableUtils );\n\n\t\tconst table = getParentTable( selection.getFirstPosition() );\n\t\tconst tableCell = selection.getFirstPosition().parent;\n\n\t\tconst { column } = tableUtils.getCellLocation( tableCell );\n\t\tconst insertAt = this.order === 'after' ? column + 1 : column;\n\n\t\ttableUtils.insertColumns( table, { columns: 1, at: insertAt } );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/splitcellcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport TableUtils from '../tableutils';\n\n/**\n * The split cell command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'splitTableCellVertically'`\n * and `'splitTableCellHorizontally'`  editor commands.\n *\n * You can split any cell vertically or horizontally by executing this command. For example, to split the selected table cell vertically:\n *\n *\t\teditor.execute( 'splitTableCellVertically' );\n *\n * @extends module:core/command~Command\n */\nexport default class SplitCellCommand extends Command {\n\t/**\n\t * Creates a new `SplitCellCommand` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor on which this command will be used.\n\t * @param {Object} options\n\t * @param {String} options.direction Indicates whether the command should split cells `'horizontally'` or `'vertically'`.\n\t */\n\tconstructor( editor, options = {} ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The direction that indicates which cell will be split.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} #direction\n\t\t */\n\t\tthis.direction = options.direction || 'horizontally';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tconst element = doc.selection.getFirstPosition().parent;\n\n\t\tthis.isEnabled = element.is( 'tableCell' );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst document = model.document;\n\t\tconst selection = document.selection;\n\n\t\tconst firstPosition = selection.getFirstPosition();\n\t\tconst tableCell = firstPosition.parent;\n\n\t\tconst isHorizontally = this.direction === 'horizontally';\n\n\t\tconst tableUtils = this.editor.plugins.get( TableUtils );\n\n\t\tif ( isHorizontally ) {\n\t\t\ttableUtils.splitCellHorizontally( tableCell, 2 );\n\t\t} else {\n\t\t\ttableUtils.splitCellVertically( tableCell, 2 );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/mergecellcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport TableWalker from '../tablewalker';\nimport { updateNumericAttribute } from './utils';\nimport TableUtils from '../tableutils';\n\n/**\n * The merge cell command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'mergeTableCellRight'`, `'mergeTableCellLeft'`,\n * `'mergeTableCellUp'` and `'mergeTableCellDown'` editor commands.\n *\n * To merge a table cell at the current selection with another cell, execute the command corresponding with the preferred direction.\n *\n * For example, to merge with a cell to the right:\n *\n *\t\teditor.execute( 'mergeTableCellRight' );\n *\n * **Note**: If a table cell has a different [`rowspan`](https://www.w3.org/TR/html50/tabular-data.html#attr-tdth-rowspan)\n * (for `'mergeTableCellRight'` and `'mergeTableCellLeft'`) or [`colspan`](https://www.w3.org/TR/html50/tabular-data.html#attr-tdth-colspan)\n * (for `'mergeTableCellUp'` and `'mergeTableCellDown'`), the command will be disabled.\n *\n * @extends module:core/command~Command\n */\nexport default class MergeCellCommand extends Command {\n\t/**\n\t * Creates a new `MergeCellCommand` instance.\n\t *\n\t * @param {module:core/editor/editor~Editor} editor The editor on which this command will be used.\n\t * @param {Object} options\n\t * @param {String} options.direction Indicates which cell to merge with the currently selected one.\n\t * Possible values are: `'left'`, `'right'`, `'up'` and `'down'`.\n\t */\n\tconstructor( editor, options ) {\n\t\tsuper( editor );\n\n\t\t/**\n\t\t * The direction that indicates which cell will be merged with the currently selected one.\n\t\t *\n\t\t * @readonly\n\t\t * @member {String} #direction\n\t\t */\n\t\tthis.direction = options.direction;\n\n\t\t/**\n\t\t * Whether the merge is horizontal (left/right) or vertical (up/down).\n\t\t *\n\t\t * @readonly\n\t\t * @member {Boolean} #isHorizontal\n\t\t */\n\t\tthis.isHorizontal = this.direction == 'right' || this.direction == 'left';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst cellToMerge = this._getMergeableCell();\n\n\t\tthis.isEnabled = !!cellToMerge;\n\t\t// In order to check if currently selected cell can be merged with one defined by #direction some computation are done beforehand.\n\t\t// As such we can cache it as a command's value.\n\t\tthis.value = cellToMerge;\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * Depending on the command's {@link #direction} value, it will merge the cell that is to the `'left'`, `'right'`, `'up'` or `'down'`.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst tableCell = doc.selection.getFirstPosition().parent;\n\t\tconst cellToMerge = this.value;\n\t\tconst direction = this.direction;\n\n\t\tmodel.change( writer => {\n\t\t\tconst isMergeNext = direction == 'right' || direction == 'down';\n\n\t\t\t// The merge mechanism is always the same so sort cells to be merged.\n\t\t\tconst cellToExpand = isMergeNext ? tableCell : cellToMerge;\n\t\t\tconst cellToRemove = isMergeNext ? cellToMerge : tableCell;\n\n\t\t\t// Cache the parent of cell to remove for later check.\n\t\t\tconst removedTableCellRow = cellToRemove.parent;\n\n\t\t\t// Remove table cell and merge it contents with merged cell.\n\t\t\twriter.move( Range.createIn( cellToRemove ), Position.createAt( cellToExpand, 'end' ) );\n\t\t\twriter.remove( cellToRemove );\n\n\t\t\tconst spanAttribute = this.isHorizontal ? 'colspan' : 'rowspan';\n\t\t\tconst cellSpan = parseInt( tableCell.getAttribute( spanAttribute ) || 1 );\n\t\t\tconst cellToMergeSpan = parseInt( cellToMerge.getAttribute( spanAttribute ) || 1 );\n\n\t\t\t// Update table cell span attribute and merge set selection on merged contents.\n\t\t\twriter.setAttribute( spanAttribute, cellSpan + cellToMergeSpan, cellToExpand );\n\t\t\twriter.setSelection( Range.createIn( cellToExpand ) );\n\n\t\t\t// Remove empty row after merging.\n\t\t\tif ( !removedTableCellRow.childCount ) {\n\t\t\t\tremoveEmptyRow( removedTableCellRow, writer );\n\t\t\t}\n\t\t} );\n\t}\n\n\t/**\n\t * Returns a cell that can be merged with the current cell depending on the command's direction.\n\t *\n\t * @returns {module:engine/model/element|undefined}\n\t * @private\n\t */\n\t_getMergeableCell() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst element = doc.selection.getFirstPosition().parent;\n\n\t\tif ( !element.is( 'tableCell' ) ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst tableUtils = this.editor.plugins.get( TableUtils );\n\n\t\t// First get the cell on proper direction.\n\t\tconst cellToMerge = this.isHorizontal ?\n\t\t\tgetHorizontalCell( element, this.direction, tableUtils ) :\n\t\t\tgetVerticalCell( element, this.direction );\n\n\t\tif ( !cellToMerge ) {\n\t\t\treturn;\n\t\t}\n\n\t\t// If found check if the span perpendicular to merge direction is equal on both cells.\n\t\tconst spanAttribute = this.isHorizontal ? 'rowspan' : 'colspan';\n\t\tconst span = parseInt( element.getAttribute( spanAttribute ) || 1 );\n\n\t\tconst cellToMergeSpan = parseInt( cellToMerge.getAttribute( spanAttribute ) || 1 );\n\n\t\tif ( cellToMergeSpan === span ) {\n\t\t\treturn cellToMerge;\n\t\t}\n\t}\n}\n\n// Returns the cell that can be merged horizontally.\n//\n// @param {module:engine/model/element~Element} tableCell\n// @param {String} direction\n// @returns {module:engine/model/node~Node|null}\nfunction getHorizontalCell( tableCell, direction, tableUtils ) {\n\tconst horizontalCell = direction == 'right' ? tableCell.nextSibling : tableCell.previousSibling;\n\n\tif ( !horizontalCell ) {\n\t\treturn;\n\t}\n\n\t// Sort cells:\n\tconst cellOnLeft = direction == 'right' ? tableCell : horizontalCell;\n\tconst cellOnRight = direction == 'right' ? horizontalCell : tableCell;\n\n\t// Get their column indexes:\n\tconst { column: leftCellColumn } = tableUtils.getCellLocation( cellOnLeft );\n\tconst { column: rightCellColumn } = tableUtils.getCellLocation( cellOnRight );\n\n\tconst leftCellSpan = parseInt( cellOnLeft.getAttribute( 'colspan' ) || 1 );\n\n\t// The cell on the right must have index that is distant to the cell on the left by the left cell's width (colspan).\n\tconst cellsAreTouching = leftCellColumn + leftCellSpan === rightCellColumn;\n\n\t// If the right cell's column index is different it means that there are rowspanned cells between them.\n\treturn cellsAreTouching ? horizontalCell : undefined;\n}\n\n// Returns the cell that can be merged vertically.\n//\n// @param {module:engine/model/element~Element} tableCell\n// @param {String} direction\n// @returns {module:engine/model/node~Node|null}\nfunction getVerticalCell( tableCell, direction ) {\n\tconst tableRow = tableCell.parent;\n\tconst table = tableRow.parent;\n\n\tconst rowIndex = table.getChildIndex( tableRow );\n\n\t// Don't search for mergeable cell if direction points out of the table.\n\tif ( ( direction == 'down' && rowIndex === table.childCount - 1 ) || ( direction == 'up' && rowIndex === 0 ) ) {\n\t\treturn;\n\t}\n\n\tconst headingRows = table.getAttribute( 'headingRows' ) || 0;\n\n\t// Don't search for mergeable cell if direction points out of the current table section.\n\tif ( headingRows && ( ( direction == 'down' && rowIndex === headingRows - 1 ) || ( direction == 'up' && rowIndex === headingRows ) ) ) {\n\t\treturn;\n\t}\n\n\tconst currentCellRowSpan = parseInt( tableCell.getAttribute( 'rowspan' ) || 1 );\n\tconst rowOfCellToMerge = direction == 'down' ? rowIndex + currentCellRowSpan : rowIndex;\n\n\tconst tableMap = [ ...new TableWalker( table, { endRow: rowOfCellToMerge } ) ];\n\n\tconst currentCellData = tableMap.find( value => value.cell === tableCell );\n\tconst mergeColumn = currentCellData.column;\n\n\tconst cellToMergeData = tableMap.find( ( { row, rowspan, column } ) => {\n\t\tif ( column !== mergeColumn ) {\n\t\t\treturn false;\n\t\t}\n\n\t\tif ( direction == 'down' ) {\n\t\t\t// If merging a cell below the mergeRow is already calculated.\n\t\t\treturn row === rowOfCellToMerge;\n\t\t} else {\n\t\t\t// If merging a cell above calculate if it spans to mergeRow.\n\t\t\treturn rowOfCellToMerge === row + rowspan;\n\t\t}\n\t} );\n\n\treturn cellToMergeData && cellToMergeData.cell;\n}\n\n// Properly removes empty row from a table. Will update `rowspan` attribute of cells that overlaps removed row.\n//\n// @param {module:engine/model/element~Element} removedTableCellRow\n// @param {module:engine/model/writer~Writer} writer\nfunction removeEmptyRow( removedTableCellRow, writer ) {\n\tconst table = removedTableCellRow.parent;\n\n\tconst removedRowIndex = table.getChildIndex( removedTableCellRow );\n\n\tfor ( const { cell, row, rowspan } of new TableWalker( table, { endRow: removedRowIndex } ) ) {\n\t\tconst overlapsRemovedRow = row + rowspan - 1 >= removedRowIndex;\n\n\t\tif ( overlapsRemovedRow ) {\n\t\t\tupdateNumericAttribute( 'rowspan', rowspan - 1, cell, writer );\n\t\t}\n\t}\n\n\twriter.remove( removedTableCellRow );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/removerowcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\n\nimport TableWalker from '../tablewalker';\nimport { updateNumericAttribute } from './utils';\n\n/**\n * The remove row command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'removeTableRow'` editor command.\n *\n * To remove the row containing the selected cell, execute the command:\n *\n *\t\teditor.execute( 'removeTableRow' );\n *\n * @extends module:core/command~Command\n */\nexport default class RemoveRowCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\n\t\tconst element = doc.selection.getFirstPosition().parent;\n\n\t\tthis.isEnabled = element.is( 'tableCell' ) && element.parent.parent.childCount > 1;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\n\t\tconst firstPosition = selection.getFirstPosition();\n\t\tconst tableCell = firstPosition.parent;\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\n\t\tconst currentRow = table.getChildIndex( tableRow );\n\t\tconst headingRows = table.getAttribute( 'headingRows' ) || 0;\n\n\t\tmodel.change( writer => {\n\t\t\tif ( headingRows && currentRow <= headingRows ) {\n\t\t\t\tupdateNumericAttribute( 'headingRows', headingRows - 1, table, writer, 0 );\n\t\t\t}\n\n\t\t\tconst tableMap = [ ...new TableWalker( table, { endRow: currentRow } ) ];\n\n\t\t\tconst cellsToMove = new Map();\n\n\t\t\t// Get cells from removed row that are spanned over multiple rows.\n\t\t\ttableMap\n\t\t\t\t.filter( ( { row, rowspan } ) => row === currentRow && rowspan > 1 )\n\t\t\t\t.forEach( ( { column, cell, rowspan } ) => cellsToMove.set( column, { cell, rowspanToSet: rowspan - 1 } ) );\n\n\t\t\t// Reduce rowspan on cells that are above removed row and overlaps removed row.\n\t\t\ttableMap\n\t\t\t\t.filter( ( { row, rowspan } ) => row <= currentRow - 1 && row + rowspan > currentRow )\n\t\t\t\t.forEach( ( { cell, rowspan } ) => updateNumericAttribute( 'rowspan', rowspan - 1, cell, writer ) );\n\n\t\t\t// Move cells to another row.\n\t\t\tconst targetRow = currentRow + 1;\n\t\t\tconst tableWalker = new TableWalker( table, { includeSpanned: true, startRow: targetRow, endRow: targetRow } );\n\n\t\t\tlet previousCell;\n\n\t\t\tfor ( const { row, column, cell } of [ ...tableWalker ] ) {\n\t\t\t\tif ( cellsToMove.has( column ) ) {\n\t\t\t\t\tconst { cell: cellToMove, rowspanToSet } = cellsToMove.get( column );\n\t\t\t\t\tconst targetPosition = previousCell ? Position.createAfter( previousCell ) : Position.createAt( table.getChild( row ) );\n\n\t\t\t\t\twriter.move( Range.createOn( cellToMove ), targetPosition );\n\t\t\t\t\tupdateNumericAttribute( 'rowspan', rowspanToSet, cellToMove, writer );\n\n\t\t\t\t\tpreviousCell = cellToMove;\n\t\t\t\t} else {\n\t\t\t\t\tpreviousCell = cell;\n\t\t\t\t}\n\t\t\t}\n\n\t\t\twriter.remove( tableRow );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/removecolumncommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\nimport TableWalker from '../tablewalker';\nimport TableUtils from '../tableutils';\nimport { updateNumericAttribute } from './utils';\n\n/**\n * The remove column command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'removeTableColumn'` editor command.\n *\n * To remove the column containing the selected cell, execute the command:\n *\n *\t\teditor.execute( 'removeTableColumn' );\n *\n * @extends module:core/command~Command\n */\nexport default class RemoveColumnCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\t\tconst tableUtils = editor.plugins.get( TableUtils );\n\n\t\tconst selectedElement = selection.getFirstPosition().parent;\n\n\t\tthis.isEnabled = selectedElement.is( 'tableCell' ) && tableUtils.getColumns( selectedElement.parent.parent ) > 1;\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst selection = model.document.selection;\n\n\t\tconst firstPosition = selection.getFirstPosition();\n\n\t\tconst tableCell = firstPosition.parent;\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\n\t\tconst headingColumns = table.getAttribute( 'headingColumns' ) || 0;\n\t\tconst row = table.getChildIndex( tableRow );\n\n\t\t// Cache the table before removing or updating colspans.\n\t\tconst tableMap = [ ...new TableWalker( table ) ];\n\n\t\t// Get column index of removed column.\n\t\tconst cellData = tableMap.find( value => value.cell === tableCell );\n\t\tconst removedColumn = cellData.column;\n\n\t\tmodel.change( writer => {\n\t\t\t// Update heading columns attribute if removing a row from head section.\n\t\t\tif ( headingColumns && row <= headingColumns ) {\n\t\t\t\twriter.setAttribute( 'headingColumns', headingColumns - 1, table );\n\t\t\t}\n\n\t\t\tfor ( const { cell, column, colspan } of tableMap ) {\n\t\t\t\t// If colspaned cell overlaps removed column decrease it's span.\n\t\t\t\tif ( column <= removedColumn && colspan > 1 && column + colspan > removedColumn ) {\n\t\t\t\t\tupdateNumericAttribute( 'colspan', colspan - 1, cell, writer );\n\t\t\t\t} else if ( column === removedColumn ) {\n\t\t\t\t\t// The cell in removed column has colspan of 1.\n\t\t\t\t\twriter.remove( cell );\n\t\t\t\t}\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/setheaderrowcommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\nimport Position from '@ckeditor/ckeditor5-engine/src/model/position';\n\nimport { getParentTable, updateNumericAttribute } from './utils';\nimport TableWalker from '../tablewalker';\n\n/**\n * The header row command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'setTableColumnHeader'` editor command.\n *\n * You can make the row containing the selected cell a [header](https://www.w3.org/TR/html50/tabular-data.html#the-th-element) by executing:\n *\n *\t\teditor.execute( 'setTableRowHeader' );\n *\n * **Note:** All preceding rows will also become headers. If the current row is already a header, executing this command\n * will make it a regular row back again (including the following rows).\n *\n * @extends module:core/command~Command\n */\nexport default class SetHeaderRowCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\n\t\tconst position = selection.getFirstPosition();\n\t\tconst tableParent = getParentTable( position );\n\n\t\tconst isInTable = !!tableParent;\n\n\t\tthis.isEnabled = isInTable;\n\n\t\t/**\n\t\t * Flag indicating whether the command is active. The command is active when the\n\t\t * {@link module:engine/model/selection~Selection} is in a header row.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #value\n\t\t */\n\t\tthis.value = isInTable && this._isInHeading( position.parent, tableParent );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * When the selection is in a non-header row, the command will set the `headingRows` table attribute to cover that row.\n\t *\n\t * When the selection is already in a header row, it will set `headingRows` so the heading section will end before that row.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\n\t\tconst position = selection.getFirstPosition();\n\t\tconst tableCell = position.parent;\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\n\t\tconst currentHeadingRows = table.getAttribute( 'headingRows' ) || 0;\n\t\tlet rowIndex = tableRow.index;\n\n\t\tif ( rowIndex + 1 !== currentHeadingRows ) {\n\t\t\trowIndex++;\n\t\t}\n\n\t\tmodel.change( writer => {\n\t\t\tif ( rowIndex ) {\n\t\t\t\t// Changing heading rows requires to check if any of a heading cell is overlapping vertically the table head.\n\t\t\t\t// Any table cell that has a rowspan attribute > 1 will not exceed the table head so we need to fix it in rows below.\n\t\t\t\tconst cellsToSplit = getOverlappingCells( table, rowIndex, currentHeadingRows );\n\n\t\t\t\tfor ( const cell of cellsToSplit ) {\n\t\t\t\t\tsplitHorizontally( cell, rowIndex, writer );\n\t\t\t\t}\n\t\t\t}\n\n\t\t\tupdateNumericAttribute( 'headingRows', rowIndex, table, writer, 0 );\n\t\t} );\n\t}\n\n\t/**\n\t * Checks if a table cell is in the heading section.\n\t *\n\t * @param {module:engine/model/element~Element} tableCell\n\t * @param {module:engine/model/element~Element} table\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_isInHeading( tableCell, table ) {\n\t\tconst headingRows = parseInt( table.getAttribute( 'headingRows' ) || 0 );\n\n\t\treturn !!headingRows && tableCell.parent.index < headingRows;\n\t}\n}\n\n// Returns cells that span beyond the new heading section.\n//\n// @param {module:engine/model/element~Element} table The table to check.\n// @param {Number} headingRowsToSet New heading rows attribute.\n// @param {Number} currentHeadingRows Current heading rows attribute.\n// @returns {Array.<module:engine/model/element~Element>}\nfunction getOverlappingCells( table, headingRowsToSet, currentHeadingRows ) {\n\tconst cellsToSplit = [];\n\n\tconst startAnalysisRow = headingRowsToSet > currentHeadingRows ? currentHeadingRows : 0;\n\t// We're analyzing only when headingRowsToSet > 0.\n\tconst endAnalysisRow = headingRowsToSet - 1;\n\n\tconst tableWalker = new TableWalker( table, { startRow: startAnalysisRow, endRow: endAnalysisRow } );\n\n\tfor ( const { row, rowspan, cell } of tableWalker ) {\n\t\tif ( rowspan > 1 && row + rowspan > headingRowsToSet ) {\n\t\t\tcellsToSplit.push( cell );\n\t\t}\n\t}\n\n\treturn cellsToSplit;\n}\n\n// Splits the table cell horizontally.\n//\n// @param {module:engine/model/element~Element} tableCell\n// @param {Number} headingRows\n// @param {module:engine/model/writer~Writer} writer\nfunction splitHorizontally( tableCell, headingRows, writer ) {\n\tconst tableRow = tableCell.parent;\n\tconst table = tableRow.parent;\n\tconst rowIndex = tableRow.index;\n\n\tconst rowspan = parseInt( tableCell.getAttribute( 'rowspan' ) );\n\tconst newRowspan = headingRows - rowIndex;\n\n\tconst attributes = {};\n\n\tconst spanToSet = rowspan - newRowspan;\n\n\tif ( spanToSet > 1 ) {\n\t\tattributes.rowspan = spanToSet;\n\t}\n\n\tconst startRow = table.getChildIndex( tableRow );\n\tconst endRow = startRow + newRowspan;\n\tconst tableMap = [ ...new TableWalker( table, { startRow, endRow, includeSpanned: true } ) ];\n\n\tlet columnIndex;\n\n\tfor ( const { row, column, cell, colspan, cellIndex } of tableMap ) {\n\t\tif ( cell === tableCell ) {\n\t\t\tcolumnIndex = column;\n\n\t\t\tif ( colspan > 1 ) {\n\t\t\t\tattributes.colspan = colspan;\n\t\t\t}\n\t\t}\n\n\t\tif ( columnIndex !== undefined && columnIndex === column && row === endRow ) {\n\t\t\tconst tableRow = table.getChild( row );\n\n\t\t\twriter.insertElement( 'tableCell', attributes, Position.createFromParentAndOffset( tableRow, cellIndex ) );\n\t\t}\n\t}\n\n\t// Update the rowspan attribute after updating table.\n\tupdateNumericAttribute( 'rowspan', newRowspan, tableCell, writer );\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/commands/setheadercolumncommand\n */\n\nimport Command from '@ckeditor/ckeditor5-core/src/command';\n\nimport { getParentTable, updateNumericAttribute } from './utils';\n\n/**\n * The header column command.\n *\n * The command is registered by {@link module:table/tableediting~TableEditing} as `'setTableColumnHeader'` editor command.\n *\n * You can make the column containing the selected cell a [header](https://www.w3.org/TR/html50/tabular-data.html#the-th-element)\n * by executing:\n *\n *\t\teditor.execute( 'setTableColumnHeader' );\n *\n * **Note:** All preceding columns will also become headers. If the current column is already a header, executing this command\n * will make it a regular column back again (including the following columns).\n *\n * @extends module:core/command~Command\n */\nexport default class SetHeaderColumnCommand extends Command {\n\t/**\n\t * @inheritDoc\n\t */\n\trefresh() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\n\t\tconst position = selection.getFirstPosition();\n\t\tconst tableParent = getParentTable( position );\n\n\t\tconst isInTable = !!tableParent;\n\n\t\tthis.isEnabled = isInTable;\n\n\t\t/**\n\t\t * Flag indicating whether the command is active. The command is active when the\n\t\t * {@link module:engine/model/selection~Selection} is in a header column.\n\t\t *\n\t\t * @observable\n\t\t * @readonly\n\t\t * @member {Boolean} #value\n\t\t */\n\t\tthis.value = isInTable && this._isInHeading( position.parent, tableParent );\n\t}\n\n\t/**\n\t * Executes the command.\n\t *\n\t * When the selection is in a non-header column, the command will set the `headingColumns` table attribute to cover that column.\n\t *\n\t * When the selection is already in a header column, it will set `headingColumns` so the heading section will end before that column.\n\t *\n\t * @fires execute\n\t */\n\texecute() {\n\t\tconst model = this.editor.model;\n\t\tconst doc = model.document;\n\t\tconst selection = doc.selection;\n\t\tconst tableUtils = this.editor.plugins.get( 'TableUtils' );\n\n\t\tconst position = selection.getFirstPosition();\n\t\tconst tableCell = position.parent;\n\t\tconst tableRow = tableCell.parent;\n\t\tconst table = tableRow.parent;\n\n\t\tconst currentHeadingColumns = parseInt( table.getAttribute( 'headingColumns' ) || 0 );\n\n\t\tlet { column } = tableUtils.getCellLocation( tableCell );\n\n\t\tif ( column + 1 !== currentHeadingColumns ) {\n\t\t\tcolumn++;\n\t\t}\n\n\t\tmodel.change( writer => {\n\t\t\tupdateNumericAttribute( 'headingColumns', column, table, writer, 0 );\n\t\t} );\n\t}\n\n\t/**\n\t * Checks if a table cell is in the heading section.\n\t *\n\t * @param {module:engine/model/element~Element} tableCell\n\t * @param {module:engine/model/element~Element} table\n\t * @returns {Boolean}\n\t * @private\n\t */\n\t_isInHeading( tableCell, table ) {\n\t\tconst headingColumns = parseInt( table.getAttribute( 'headingColumns' ) || 0 );\n\n\t\tconst tableUtils = this.editor.plugins.get( 'TableUtils' );\n\n\t\tconst { column } = tableUtils.getCellLocation( tableCell );\n\n\t\treturn !!headingColumns && column < headingColumns;\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/tableediting\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport { upcastElementToElement } from '@ckeditor/ckeditor5-engine/src/conversion/upcast-converters';\nimport Range from '@ckeditor/ckeditor5-engine/src/model/range';\nimport { keyCodes } from '@ckeditor/ckeditor5-utils/src/keyboard';\n\nimport upcastTable from './converters/upcasttable';\nimport {\n\tdowncastInsertCell,\n\tdowncastInsertRow,\n\tdowncastInsertTable,\n\tdowncastRemoveRow,\n\tdowncastTableHeadingColumnsChange,\n\tdowncastTableHeadingRowsChange\n} from './converters/downcast';\nimport InsertTableCommand from './commands/inserttablecommand';\nimport InsertRowCommand from './commands/insertrowcommand';\nimport InsertColumnCommand from './commands/insertcolumncommand';\nimport SplitCellCommand from './commands/splitcellcommand';\nimport MergeCellCommand from './commands/mergecellcommand';\nimport RemoveRowCommand from './commands/removerowcommand';\nimport RemoveColumnCommand from './commands/removecolumncommand';\nimport SetHeaderRowCommand from './commands/setheaderrowcommand';\nimport SetHeaderColumnCommand from './commands/setheadercolumncommand';\nimport { getParentTable } from './commands/utils';\nimport TableUtils from './tableutils';\n\nimport '../theme/tableediting.css';\n\n/**\n * The table editing feature.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class TableEditing extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst schema = editor.model.schema;\n\t\tconst conversion = editor.conversion;\n\n\t\tschema.register( 'table', {\n\t\t\tallowWhere: '$block',\n\t\t\tallowAttributes: [ 'headingRows', 'headingColumns' ],\n\t\t\tisLimit: true,\n\t\t\tisObject: true\n\t\t} );\n\n\t\tschema.register( 'tableRow', {\n\t\t\tallowIn: 'table',\n\t\t\tisLimit: true\n\t\t} );\n\n\t\tschema.register( 'tableCell', {\n\t\t\tallowIn: 'tableRow',\n\t\t\tallowContentOf: '$block',\n\t\t\tallowAttributes: [ 'colspan', 'rowspan' ],\n\t\t\tisLimit: true\n\t\t} );\n\n\t\t// Table conversion.\n\t\tconversion.for( 'upcast' ).add( upcastTable() );\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastInsertTable( { asWidget: true } ) );\n\t\tconversion.for( 'dataDowncast' ).add( downcastInsertTable() );\n\n\t\t// Table row conversion.\n\t\tconversion.for( 'upcast' ).add( upcastElementToElement( { model: 'tableRow', view: 'tr' } ) );\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastInsertRow( { asWidget: true } ) );\n\t\tconversion.for( 'dataDowncast' ).add( downcastInsertRow() );\n\t\tconversion.for( 'downcast' ).add( downcastRemoveRow() );\n\n\t\t// Table cell conversion.\n\t\tconversion.for( 'upcast' ).add( upcastElementToElement( { model: 'tableCell', view: 'td' } ) );\n\t\tconversion.for( 'upcast' ).add( upcastElementToElement( { model: 'tableCell', view: 'th' } ) );\n\n\t\tconversion.for( 'editingDowncast' ).add( downcastInsertCell( { asWidget: true } ) );\n\t\tconversion.for( 'dataDowncast' ).add( downcastInsertCell() );\n\n\t\t// Table attributes conversion.\n\t\tconversion.attributeToAttribute( { model: 'colspan', view: 'colspan' } );\n\t\tconversion.attributeToAttribute( { model: 'rowspan', view: 'rowspan' } );\n\n\t\t// Table heading rows and cols conversion.\n\t\tconversion.for( 'editingDowncast' ).add( downcastTableHeadingColumnsChange( { asWidget: true } ) );\n\t\tconversion.for( 'dataDowncast' ).add( downcastTableHeadingColumnsChange() );\n\t\tconversion.for( 'editingDowncast' ).add( downcastTableHeadingRowsChange( { asWidget: true } ) );\n\t\tconversion.for( 'dataDowncast' ).add( downcastTableHeadingRowsChange() );\n\n\t\t// Define all the commands.\n\t\teditor.commands.add( 'insertTable', new InsertTableCommand( editor ) );\n\t\teditor.commands.add( 'insertTableRowAbove', new InsertRowCommand( editor, { order: 'above' } ) );\n\t\teditor.commands.add( 'insertTableRowBelow', new InsertRowCommand( editor, { order: 'below' } ) );\n\t\teditor.commands.add( 'insertTableColumnBefore', new InsertColumnCommand( editor, { order: 'before' } ) );\n\t\teditor.commands.add( 'insertTableColumnAfter', new InsertColumnCommand( editor, { order: 'after' } ) );\n\n\t\teditor.commands.add( 'removeTableRow', new RemoveRowCommand( editor ) );\n\t\teditor.commands.add( 'removeTableColumn', new RemoveColumnCommand( editor ) );\n\n\t\teditor.commands.add( 'splitTableCellVertically', new SplitCellCommand( editor, { direction: 'vertically' } ) );\n\t\teditor.commands.add( 'splitTableCellHorizontally', new SplitCellCommand( editor, { direction: 'horizontally' } ) );\n\n\t\teditor.commands.add( 'mergeTableCellRight', new MergeCellCommand( editor, { direction: 'right' } ) );\n\t\teditor.commands.add( 'mergeTableCellLeft', new MergeCellCommand( editor, { direction: 'left' } ) );\n\t\teditor.commands.add( 'mergeTableCellDown', new MergeCellCommand( editor, { direction: 'down' } ) );\n\t\teditor.commands.add( 'mergeTableCellUp', new MergeCellCommand( editor, { direction: 'up' } ) );\n\n\t\teditor.commands.add( 'setTableColumnHeader', new SetHeaderColumnCommand( editor ) );\n\t\teditor.commands.add( 'setTableRowHeader', new SetHeaderRowCommand( editor ) );\n\n\t\t// Handle tab key navigation.\n\t\tthis.listenTo( editor.editing.view.document, 'keydown', ( ...args ) => this._handleTabOnSelectedTable( ...args ) );\n\t\tthis.listenTo( editor.editing.view.document, 'keydown', ( ...args ) => this._handleTabInsideTable( ...args ) );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ TableUtils ];\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events for the <kbd>Tab</kbd> key executed\n\t * when the table widget is selected.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_handleTabOnSelectedTable( eventInfo, domEventData ) {\n\t\tconst tabPressed = domEventData.keyCode == keyCodes.tab;\n\n\t\t// Act only on TAB & SHIFT-TAB - Do not override native CTRL+TAB handler.\n\t\tif ( !tabPressed || domEventData.ctrlKey ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\n\t\tif ( !selection.isCollapsed && selection.rangeCount === 1 && selection.getFirstRange().isFlat ) {\n\t\t\tconst selectedElement = selection.getSelectedElement();\n\n\t\t\tif ( !selectedElement || selectedElement.name != 'table' ) {\n\t\t\t\treturn;\n\t\t\t}\n\n\t\t\teventInfo.stop();\n\t\t\tdomEventData.preventDefault();\n\t\t\tdomEventData.stopPropagation();\n\n\t\t\teditor.model.change( writer => {\n\t\t\t\twriter.setSelection( Range.createIn( selectedElement.getChild( 0 ).getChild( 0 ) ) );\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Handles {@link module:engine/view/document~Document#event:keydown keydown} events for the <kbd>Tab</kbd> key executed inside table\n\t * cell.\n\t *\n\t * @private\n\t * @param {module:utils/eventinfo~EventInfo} eventInfo\n\t * @param {module:engine/view/observer/domeventdata~DomEventData} domEventData\n\t */\n\t_handleTabInsideTable( eventInfo, domEventData ) {\n\t\tconst tabPressed = domEventData.keyCode == keyCodes.tab;\n\n\t\t// Act only on TAB & SHIFT-TAB - Do not override native CTRL+TAB handler.\n\t\tif ( !tabPressed || domEventData.ctrlKey ) {\n\t\t\treturn;\n\t\t}\n\n\t\tconst editor = this.editor;\n\t\tconst selection = editor.model.document.selection;\n\n\t\tconst table = getParentTable( selection.getFirstPosition() );\n\n\t\tif ( !table ) {\n\t\t\treturn;\n\t\t}\n\n\t\tdomEventData.preventDefault();\n\t\tdomEventData.stopPropagation();\n\n\t\tconst tableCell = selection.focus.parent;\n\t\tconst tableRow = tableCell.parent;\n\n\t\tconst currentRowIndex = table.getChildIndex( tableRow );\n\t\tconst currentCellIndex = tableRow.getChildIndex( tableCell );\n\n\t\tconst isForward = !domEventData.shiftKey;\n\t\tconst isFirstCellInRow = currentCellIndex === 0;\n\n\t\tif ( !isForward && isFirstCellInRow && currentRowIndex === 0 ) {\n\t\t\t// It's the first cell of a table - don't do anything (stay in current position).\n\t\t\treturn;\n\t\t}\n\n\t\tconst isLastCellInRow = currentCellIndex === tableRow.childCount - 1;\n\t\tconst isLastRow = currentRowIndex === table.childCount - 1;\n\n\t\tif ( isForward && isLastRow && isLastCellInRow ) {\n\t\t\teditor.plugins.get( TableUtils ).insertRows( table, { at: table.childCount } );\n\t\t}\n\n\t\tlet cellToFocus;\n\n\t\t// Move to first cell in next row.\n\t\tif ( isForward && isLastCellInRow ) {\n\t\t\tconst nextRow = table.getChild( currentRowIndex + 1 );\n\n\t\t\tcellToFocus = nextRow.getChild( 0 );\n\t\t}\n\t\t// Move to last cell in a previous row.\n\t\telse if ( !isForward && isFirstCellInRow ) {\n\t\t\tconst previousRow = table.getChild( currentRowIndex - 1 );\n\n\t\t\tcellToFocus = previousRow.getChild( previousRow.childCount - 1 );\n\t\t}\n\t\t// Move to next/previous cell.\n\t\telse {\n\t\t\tcellToFocus = tableRow.getChild( currentCellIndex + ( isForward ? 1 : -1 ) );\n\t\t}\n\n\t\teditor.model.change( writer => {\n\t\t\twriter.setSelection( Range.createIn( cellToFocus ) );\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/ui/inserttableview\n */\n\nimport View from '@ckeditor/ckeditor5-ui/src/view';\n\nimport './../../theme/inserttable.css';\n\n/**\n * The table size view.\n *\n * It renders a 10x10 grid to choose the inserted table size.\n *\n * @extends module:ui/view~View\n * @implements module:ui/dropdown/dropdownpanelfocusable~DropdownPanelFocusable\n */\nexport default class InsertTableView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * A collection of table size box items.\n\t\t *\n\t\t * @readonly\n\t\t * @member {module:ui/viewcollection~ViewCollection}\n\t\t */\n\t\tthis.items = this.createCollection();\n\n\t\t/**\n\t\t * The currently selected number of rows of the new table.\n\t\t *\n\t\t * @observable\n\t\t * @member {Number} #rows\n\t\t */\n\t\tthis.set( 'rows', 0 );\n\n\t\t/**\n\t\t * The currently selected number of columns of the new table.\n\t\t *\n\t\t * @observable\n\t\t * @member {Number} #columns\n\t\t */\n\t\tthis.set( 'columns', 0 );\n\n\t\t/**\n\t\t * The label text displayed under the boxes.\n\t\t *\n\t\t * @observable\n\t\t * @member {String} #label\n\t\t */\n\t\tthis.bind( 'label' )\n\t\t\t.to( this, 'columns', this, 'rows', ( columns, rows ) => `${ rows } x ${ columns }` );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [ 'ck' ]\n\t\t\t},\n\n\t\t\tchildren: [\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [ 'ck-insert-table-dropdown__grid' ]\n\t\t\t\t\t},\n\t\t\t\t\tchildren: this.items\n\t\t\t\t},\n\t\t\t\t{\n\t\t\t\t\ttag: 'div',\n\t\t\t\t\tattributes: {\n\t\t\t\t\t\tclass: [ 'ck-insert-table-dropdown__label' ]\n\t\t\t\t\t},\n\t\t\t\t\tchildren: [\n\t\t\t\t\t\t{\n\t\t\t\t\t\t\ttext: bind.to( 'label' )\n\t\t\t\t\t\t}\n\t\t\t\t\t]\n\t\t\t\t}\n\t\t\t],\n\n\t\t\ton: {\n\t\t\t\tmousedown: bind.to( evt => {\n\t\t\t\t\tevt.preventDefault();\n\t\t\t\t} ),\n\n\t\t\t\tclick: bind.to( () => {\n\t\t\t\t\tthis.fire( 'execute' );\n\t\t\t\t} )\n\t\t\t}\n\t\t} );\n\n\t\t// Add grid boxes to table selection view.\n\t\tfor ( let index = 0; index < 100; index++ ) {\n\t\t\tconst boxView = new TableSizeGridBoxView();\n\n\t\t\t// Listen to box view 'over' event which indicates that mouse is over this box.\n\t\t\tboxView.on( 'over', () => {\n\t\t\t\t// Translate box index to the row & column index.\n\t\t\t\tconst row = Math.floor( index / 10 );\n\t\t\t\tconst column = index % 10;\n\n\t\t\t\t// As row & column indexes are zero-based transform it to number of selected rows & columns.\n\t\t\t\tthis.set( 'rows', row + 1 );\n\t\t\t\tthis.set( 'columns', column + 1 );\n\t\t\t} );\n\n\t\t\tthis.items.add( boxView );\n\t\t}\n\n\t\tthis.on( 'change:columns', () => {\n\t\t\tthis._highlightGridBoxes();\n\t\t} );\n\n\t\tthis.on( 'change:rows', () => {\n\t\t\tthis._highlightGridBoxes();\n\t\t} );\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tfocus() {\n\t\t// The dropdown panel expects DropdownPanelFocusable interface on views passed to dropdown panel. See #30.\n\t\t// The method should be implemented while working on keyboard support for this view. See #22.\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tfocusLast() {\n\t\t// The dropdown panel expects DropdownPanelFocusable interface on views passed to dropdown panel. See #30.\n\t\t// The method should be implemented while working on keyboard support for this view. See #22.\n\t}\n\n\t/**\n\t * Highlights grid boxes depending on rows and columns selected.\n\t *\n\t * @private\n\t */\n\t_highlightGridBoxes() {\n\t\tconst rows = this.rows;\n\t\tconst columns = this.columns;\n\n\t\tthis.items.map( ( boxView, index ) => {\n\t\t\t// Translate box index to the row & column index.\n\t\t\tconst itemRow = Math.floor( index / 10 );\n\t\t\tconst itemColumn = index % 10;\n\n\t\t\t// Grid box is highlighted when its row & column index belongs to selected number of rows & columns.\n\t\t\tconst isOn = itemRow < rows && itemColumn < columns;\n\n\t\t\tboxView.set( 'isOn', isOn );\n\t\t} );\n\t}\n}\n\n/**\n * A single grid box view element.\n *\n * This class is used to render the table size selection grid in {@link module:table/ui/inserttableview~InsertTableView}.\n *\n * @private\n */\nclass TableSizeGridBoxView extends View {\n\t/**\n\t * @inheritDoc\n\t */\n\tconstructor( locale ) {\n\t\tsuper( locale );\n\n\t\tconst bind = this.bindTemplate;\n\n\t\t/**\n\t\t * Controls whether the grid box view is \"on\".\n\t\t *\n\t\t * @observable\n\t\t * @member {Boolean} #isOn\n\t\t */\n\t\tthis.set( 'isOn', false );\n\n\t\tthis.setTemplate( {\n\t\t\ttag: 'div',\n\t\t\tattributes: {\n\t\t\t\tclass: [\n\t\t\t\t\t'ck-insert-table-dropdown-grid-box',\n\t\t\t\t\tbind.if( 'isOn', 'ck-on' )\n\t\t\t\t]\n\t\t\t},\n\t\t\ton: {\n\t\t\t\tmouseover: bind.to( 'over' )\n\t\t\t}\n\t\t} );\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n/**\n * @module table/tableui\n */\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport {\n    addListToDropdown,\n    createDropdown\n} from '@ckeditor/ckeditor5-ui/src/dropdown/utils';\nimport Model from '@ckeditor/ckeditor5-ui/src/model';\nimport Collection from '@ckeditor/ckeditor5-utils/src/collection';\nimport InsertTableView from './ui/inserttableview';\nimport tableIcon from './../theme/icons/table.svg';\nimport tableColumnIcon from './../theme/icons/table-column.svg';\nimport tableRowIcon from './../theme/icons/table-row.svg';\nimport tableMergeCellIcon from './../theme/icons/table-merge-cell.svg';\n/**\n * The table UI plugin. It introduces:\n *\n * * The `'insertTable'` dropdown,\n * * The `'tableColumn'` dropdown,\n * * The `'tableRow'` dropdown,\n * * The `'mergeTableCells'` dropdown.\n *\n * The `'tableColumn'`, `'tableRow'`, `'mergeTableCells'` dropdowns work best with {@link module:table/tabletoolbar~TableToolbar}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class TableUI extends Plugin {\n    /**\n\t * @inheritDoc\n\t */\n    init() {\n        const editor = this.editor;\n        const t = this.editor.t;\n        editor.ui.componentFactory.add('insertTable', locale => {\n            const command = editor.commands.get('insertTable');\n            const dropdownView = createDropdown(locale);\n            dropdownView.bind('isEnabled').to(command);\n            // Decorate dropdown's button.\n            dropdownView.buttonView.set({\n                icon: tableIcon,\n                label: t('d'),\n                tooltip: true\n            });\n            // Prepare custom view for dropdown's panel.\n            const insertTableView = new InsertTableView(locale);\n            dropdownView.panelView.children.add(insertTableView);\n            insertTableView.delegate('execute').to(dropdownView);\n            dropdownView.buttonView.on('open', () => {\n                // Reset the chooser before showing it to the user.\n                insertTableView.rows = 0;\n                insertTableView.columns = 0;\n            });\n            dropdownView.on('execute', () => {\n                editor.execute('insertTable', {\n                    rows: insertTableView.rows,\n                    columns: insertTableView.columns\n                });\n                editor.editing.view.focus();\n            });\n            return dropdownView;\n        });\n        editor.ui.componentFactory.add('tableColumn', locale => {\n            const options = [\n                {\n                    type: 'switchbutton',\n                    model: {\n                        commandName: 'setTableColumnHeader',\n                        label: t('e'),\n                        bindIsOn: true\n                    }\n                },\n                { type: 'separator' },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'insertTableColumnBefore',\n                        label: t('f')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'insertTableColumnAfter',\n                        label: t('g')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'removeTableColumn',\n                        label: t('h')\n                    }\n                }\n            ];\n            return this._prepareDropdown(t('i'), tableColumnIcon, options, locale);\n        });\n        editor.ui.componentFactory.add('tableRow', locale => {\n            const options = [\n                {\n                    type: 'switchbutton',\n                    model: {\n                        commandName: 'setTableRowHeader',\n                        label: t('j'),\n                        bindIsOn: true\n                    }\n                },\n                { type: 'separator' },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'insertTableRowBelow',\n                        label: t('k')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'insertTableRowAbove',\n                        label: t('l')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'removeTableRow',\n                        label: t('m')\n                    }\n                }\n            ];\n            return this._prepareDropdown(t('n'), tableRowIcon, options, locale);\n        });\n        editor.ui.componentFactory.add('mergeTableCells', locale => {\n            const options = [\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'mergeTableCellUp',\n                        label: t('o')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'mergeTableCellRight',\n                        label: t('p')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'mergeTableCellDown',\n                        label: t('q')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'mergeTableCellLeft',\n                        label: t('r')\n                    }\n                },\n                { type: 'separator' },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'splitTableCellVertically',\n                        label: t('s')\n                    }\n                },\n                {\n                    type: 'button',\n                    model: {\n                        commandName: 'splitTableCellHorizontally',\n                        label: t('t')\n                    }\n                }\n            ];\n            return this._prepareDropdown(t('u'), tableMergeCellIcon, options, locale);\n        });\n    }\n    /**\n\t * Creates a dropdown view from the set of options.\n\t *\n\t * @private\n\t * @param {String} label The dropdown button label.\n\t * @param {String} icon An icon for the dropdown button.\n\t * @param {Array.<module:ui/dropdown/utils~ListDropdownItemDefinition>} options The list of options for the dropdown.\n\t * @param {module:utils/locale~Locale} locale\n\t * @returns {module:ui/dropdown/dropdownview~DropdownView}\n\t */\n    _prepareDropdown(label, icon, options, locale) {\n        const editor = this.editor;\n        const dropdownView = createDropdown(locale);\n        const commands = [];\n        // Prepare dropdown list items for list dropdown.\n        const itemDefinitions = new Collection();\n        for (const option of options) {\n            addListOption(option, editor, commands, itemDefinitions);\n        }\n        addListToDropdown(dropdownView, itemDefinitions);\n        // Decorate dropdown's button.\n        dropdownView.buttonView.set({\n            label,\n            icon,\n            tooltip: true\n        });\n        // Make dropdown button disabled when all options are disabled.\n        dropdownView.bind('isEnabled').toMany(commands, 'isEnabled', (...areEnabled) => {\n            return areEnabled.some(isEnabled => isEnabled);\n        });\n        this.listenTo(dropdownView, 'execute', evt => {\n            editor.execute(evt.source.commandName);\n            editor.editing.view.focus();\n        });\n        return dropdownView;\n    }\n}\n// Adds an option to a list view.\n//\n// @param {module:table/tableui~DropdownOption} option Configuration option.\n// @param {module:core/editor/editor~Editor} editor\n// @param {Array.<module:core/command~Command>} commands List of commands to update.\n// @param {Iterable.<module:ui/dropdown/utils~ListDropdownItemDefinition>} itemDefinitions\n// Collection of dropdown items to update with given option.\nfunction addListOption(option, editor, commands, itemDefinitions) {\n    const model = option.model = new Model(option.model);\n    const {commandName, bindIsOn} = option.model;\n    if (option.type !== 'separator') {\n        const command = editor.commands.get(commandName);\n        commands.push(command);\n        model.set({ commandName });\n        model.bind('isEnabled').to(command);\n        if (bindIsOn) {\n            model.bind('isOn').to(command, 'value');\n        }\n    }\n    model.set({ withText: true });\n    itemDefinitions.add(option);\n}","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/ui/utils\n */\n\nimport BalloonPanelView from '@ckeditor/ckeditor5-ui/src/panel/balloon/balloonpanelview';\nimport { getParentTable } from '../commands/utils';\n\n/**\n * A helper utility that positions the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} instance\n * with respect to the table in the editor content, if one is selected.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n */\nexport function repositionContextualBalloon( editor ) {\n\tconst balloon = editor.plugins.get( 'ContextualBalloon' );\n\n\tballoon.updatePosition( getBalloonPositionData( editor ) );\n}\n\n/**\n * Returns the positioning options that control the geometry of the\n * {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon contextual balloon} with respect\n * to the selected element in the editor content.\n *\n * @param {module:core/editor/editor~Editor} editor The editor instance.\n * @returns {module:utils/dom/position~Options}\n */\nexport function getBalloonPositionData( editor ) {\n\tconst editingView = editor.editing.view;\n\tconst defaultPositions = BalloonPanelView.defaultPositions;\n\tconst viewSelection = editingView.document.selection;\n\n\tconst parentTable = getParentTable( viewSelection.getFirstPosition() );\n\n\treturn {\n\t\ttarget: editingView.domConverter.viewToDom( parentTable ),\n\t\tpositions: [\n\t\t\tdefaultPositions.northArrowSouth,\n\t\t\tdefaultPositions.northArrowSouthWest,\n\t\t\tdefaultPositions.northArrowSouthEast,\n\t\t\tdefaultPositions.southArrowNorth,\n\t\t\tdefaultPositions.southArrowNorthWest,\n\t\t\tdefaultPositions.southArrowNorthEast\n\t\t]\n\t};\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/tabletoolbar\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ToolbarView from '@ckeditor/ckeditor5-ui/src/toolbar/toolbarview';\nimport ContextualBalloon from '@ckeditor/ckeditor5-ui/src/panel/balloon/contextualballoon';\nimport { isTableWidgetSelected, isTableContentSelected } from './utils';\nimport { repositionContextualBalloon, getBalloonPositionData } from './ui/utils';\n\nconst balloonClassName = 'ck-toolbar-container';\n\n/**\n * The table toolbar class. It creates a table toolbar that shows up when the table widget is selected.\n *\n * Toolbar components are created using the editor {@link module:ui/componentfactory~ComponentFactory ComponentFactory}\n * based on the {@link module:core/editor/editor~Editor#config configuration} stored under `table.toolbar`.\n *\n * The toolbar uses the {@link module:ui/panel/balloon/contextualballoon~ContextualBalloon}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class TableToolbar extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ContextualBalloon ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'TableToolbar';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst balloonToolbar = editor.plugins.get( 'BalloonToolbar' );\n\n\t\t// If the `BalloonToolbar` plugin is loaded, it should be disabled for tables\n\t\t// which have their own toolbar to avoid duplication.\n\t\t// https://github.com/ckeditor/ckeditor5-image/issues/110\n\t\tif ( balloonToolbar ) {\n\t\t\tthis.listenTo( balloonToolbar, 'show', evt => {\n\t\t\t\tif ( isTableWidgetSelected( editor.editing.view.document.selection ) ) {\n\t\t\t\t\tevt.stop();\n\t\t\t\t}\n\t\t\t}, { priority: 'high' } );\n\t\t}\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tafterInit() {\n\t\tconst editor = this.editor;\n\t\tconst toolbarConfig = editor.config.get( 'table.toolbar' );\n\n\t\t// Don't add the toolbar if there is no configuration.\n\t\tif ( !toolbarConfig || !toolbarConfig.length ) {\n\t\t\treturn;\n\t\t}\n\n\t\t/**\n\t\t * A contextual balloon plugin instance.\n\t\t *\n\t\t * @private\n\t\t * @member {module:ui/panel/balloon/contextualballoon~ContextualBalloon}\n\t\t */\n\t\tthis._balloon = this.editor.plugins.get( 'ContextualBalloon' );\n\n\t\t/**\n\t\t * A toolbar view instance used to display the buttons specific for table editing.\n\t\t *\n\t\t * @protected\n\t\t * @type {module:ui/toolbar/toolbarview~ToolbarView}\n\t\t */\n\t\tthis._toolbar = new ToolbarView();\n\n\t\t// Add buttons to the toolbar.\n\t\tthis._toolbar.fillFromConfig( toolbarConfig, editor.ui.componentFactory );\n\n\t\t// Show balloon panel each time table widget is selected.\n\t\tthis.listenTo( editor.ui, 'update', () => {\n\t\t\tthis._checkIsVisible();\n\t\t} );\n\n\t\t// There is no render method after focus is back in editor, we need to check if balloon panel should be visible.\n\t\tthis.listenTo( editor.ui.focusTracker, 'change:isFocused', () => {\n\t\t\tthis._checkIsVisible();\n\t\t}, { priority: 'low' } );\n\t}\n\n\t/**\n\t * Checks whether the toolbar should show up or hide depending on the current selection.\n\t *\n\t * @private\n\t */\n\t_checkIsVisible() {\n\t\tconst editor = this.editor;\n\t\tconst viewSelection = editor.editing.view.document.selection;\n\n\t\tif ( !editor.ui.focusTracker.isFocused || !isTableContentSelected( viewSelection ) ) {\n\t\t\tthis._hideToolbar();\n\t\t} else {\n\t\t\tthis._showToolbar();\n\t\t}\n\t}\n\n\t/**\n\t * Shows the {@link #_toolbar} in the {@link #_balloon}.\n\t *\n\t * @private\n\t */\n\t_showToolbar() {\n\t\tconst editor = this.editor;\n\n\t\tif ( this._isVisible ) {\n\t\t\trepositionContextualBalloon( editor );\n\t\t} else if ( !this._balloon.hasView( this._toolbar ) ) {\n\t\t\tthis._balloon.add( {\n\t\t\t\tview: this._toolbar,\n\t\t\t\tposition: getBalloonPositionData( editor ),\n\t\t\t\tballoonClassName\n\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Removes the {@link #_toolbar} from the {@link #_balloon}.\n\t *\n\t * @private\n\t */\n\t_hideToolbar() {\n\t\tif ( !this._isVisible ) {\n\t\t\treturn;\n\t\t}\n\n\t\tthis._balloon.remove( this._toolbar );\n\t}\n\n\t/**\n\t * Returns `true` when the {@link #_toolbar} is the visible view in the {@link #_balloon}.\n\t *\n\t * @private\n\t * @type {Boolean}\n\t */\n\tget _isVisible() {\n\t\treturn this._balloon.visibleView == this._toolbar;\n\t}\n}\n\n/**\n * Items to be placed in the table toolbar.\n * This option is used by the {@link module:table/tabletoolbar~TableToolbar} feature.\n *\n * Assuming that you use the {@link module:table/tableui~TableUI} feature, the following toolbar items will be available\n * in {@link module:ui/componentfactory~ComponentFactory}:\n *\n * * `'tableRow'`,\n * * `'tableColumn'`,\n * * `'mergeTableCells'`.\n *\n * You can thus configure the toolbar like this:\n *\n *\t\tconst tableConfig = {\n *\t\t\ttoolbar: [ 'tableRow', 'tableColumn', 'mergeTableCells' ]\n *\t\t};\n *\n * Of course, the same buttons can also be used in the\n * {@link module:core/editor/editorconfig~EditorConfig#toolbar main editor toolbar}.\n *\n * Read more about configuring toolbar in {@link module:core/editor/editorconfig~EditorConfig#toolbar}.\n *\n * @member {Array.<String>} module:table/table~TableConfig#toolbar\n */\n","import OPMacroTocPlugin from './plugins/op-macro-toc-plugin';\nimport OPMacroEmbeddedTable from './plugins/op-macro-embedded-table/embedded-table-plugin';\nimport OPMacroWpButtonPlugin from './plugins/op-macro-wp-button/op-macro-wp-button-plugin';\nimport OPWikiIncludePagePlugin from './plugins/op-macro-wiki-include/op-macro-wiki-include-plugin';\nimport {AtJsPlugin} from './plugins/op-atjs-plugin/atjs-plugin';\nimport OPLinkingWpPlugin from './plugins/op-linking-wp-plugin';\nimport OPMentioningPlugin from './plugins/op-mentioning-plugin';\nimport OpUploadPlugin from './plugins/op-upload-plugin';\nimport OPChildPagesPlugin from \"./plugins/op-macro-child-pages/op-macro-child-pages-plugin\";\nimport Essentials from \"@ckeditor/ckeditor5-essentials/src/essentials\";\nimport UploadAdapter from \"@ckeditor/ckeditor5-adapter-ckfinder/src/uploadadapter\";\nimport AutoFormat from \"@ckeditor/ckeditor5-autoformat/src/autoformat\";\nimport Bold from \"@ckeditor/ckeditor5-basic-styles/src/bold\";\nimport Code from \"@ckeditor/ckeditor5-basic-styles/src/code\";\nimport Italic from \"@ckeditor/ckeditor5-basic-styles/src/italic\";\nimport BlockQuote from \"@ckeditor/ckeditor5-block-quote/src/blockquote\";\nimport Heading from \"@ckeditor/ckeditor5-heading/src/heading\";\nimport Image from \"@ckeditor/ckeditor5-image/src/image\";\nimport ImageCaption from \"@ckeditor/ckeditor5-image/src/imagecaption\";\nimport ImageStyle from \"@ckeditor/ckeditor5-image/src/imagestyle\";\nimport ImageToolbar from \"@ckeditor/ckeditor5-image/src/imagetoolbar\";\nimport Link from \"@ckeditor/ckeditor5-link/src/link\";\nimport List from \"@ckeditor/ckeditor5-list/src/list\";\nimport Paragraph from \"@ckeditor/ckeditor5-paragraph/src/paragraph\";\nimport Typing from \"@ckeditor/ckeditor5-typing/src/typing\";\nimport OPHelpLinkPlugin from \"./plugins/op-help-link-plugin/op-help-link-plugin\";\nimport CodeBlockPlugin from \"./plugins/code-block/code-block\";\nimport OPPreviewPlugin from \"./plugins/op-preview.plugin\";\nimport CommonMark from \"@ckeditor/ckeditor5-markdown-gfm/src/commonmark\";\nimport Table from \"@ckeditor/ckeditor5-table/src/table\";\nimport TableToolbar from \"@ckeditor/ckeditor5-table/src/tabletoolbar\";\nimport OPMacroListPlugin from \"./plugins/op-macro-list-plugin\";\nimport OPAttachmentListenerPlugin from './plugins/op-attachment-listener-plugin';\n\n// We divide our plugins into separate concerns here\n// in order to enable / disable each group by configuration\nexport const opMacroPlugins = [\n\tOPMacroTocPlugin,\n\tOPMacroEmbeddedTable,\n\tOPMacroWpButtonPlugin,\n\tOPWikiIncludePagePlugin,\n\tOPChildPagesPlugin,\n];\n\nexport const opMentioningPlugins = [\n\tAtJsPlugin,\n\tOPLinkingWpPlugin,\n\tOPMentioningPlugin,\n];\n\nexport const opImageUploadPlugins = [\n\tOpUploadPlugin,\n\tOPAttachmentListenerPlugin\n];\n\nexport const builtinPlugins = [\n\tEssentials,\n\tUploadAdapter,\n\tAutoFormat,\n\tBold,\n\tCode,\n\tItalic,\n\tBlockQuote,\n\tHeading,\n\tImage,\n\tImageCaption,\n\tImageStyle,\n\tImageToolbar,\n\tLink,\n\tList,\n\tParagraph,\n\tTyping,\n\n\tOPHelpLinkPlugin,\n\tCodeBlockPlugin,\n\tOPPreviewPlugin,\n\n\tCommonMark,\n\tTable,\n\tTableToolbar,\n\n\tOPMacroListPlugin,\n\n].concat(\n\t// OpenProject Macro plugin group\n\topMacroPlugins,\n\n\t// OpenProject mentioning plugins\n\topMentioningPlugins,\n\n\t// OpenProject image upload plugins\n\topImageUploadPlugins,\n);\n","import EmbeddedTableEditing from './embedded-table-editing';\nimport Widget from '@ckeditor/ckeditor5-widget/src/widget';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport EmbeddedTableToolbar from './embedded-table-toolbar';\n\nexport default class OPMacroEmbeddedTable extends Plugin {\n\tstatic get requires() {\n\t\treturn [ EmbeddedTableEditing, Widget, EmbeddedTableToolbar ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPMacroEmbeddedTable';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn EmbeddedTableEditing.buttonName;\n\t}\n}\n","import Widget from '@ckeditor/ckeditor5-widget/src/widget';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport OPMacroWpButtonEditing from './op-macro-wp-button-editing';\nimport OPMacroWpButtonToolbar from './op-macro-wp-button-toolbar';\n\nexport default class OPMacroWpButtonPlugin extends Plugin {\n\tstatic get requires() {\n\t\treturn [ OPMacroWpButtonEditing, Widget, OPMacroWpButtonToolbar ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPMacroWpButton';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn OPMacroWpButtonEditing.buttonName;\n\t}\n}\n","import Widget from '@ckeditor/ckeditor5-widget/src/widget';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport OPWikiIncludePageEditing from './op-macro-wiki-include-editing';\nimport OPWikiIncludePageToolbar from './op-macro-wiki-include-toolbar';\n\nexport default class OPWikiIncludePagePlugin extends Plugin {\n\tstatic get requires() {\n\t\treturn [ OPWikiIncludePageEditing, Widget, OPWikiIncludePageToolbar ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPWikiIncludePage';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn OPWikiIncludePageEditing.buttonName;\n\t}\n}\n","import Widget from '@ckeditor/ckeditor5-widget/src/widget';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport OPChildPagesEditing from './op-macro-child-pages-editing';\nimport OPChildPagesToolbar from './op-macro-child-pages-toolbar';\n\nexport default class OPChildPagesPlugin extends Plugin {\n\tstatic get requires() {\n\t\treturn [ OPChildPagesEditing, Widget, OPChildPagesToolbar ];\n\t}\n\n\tstatic get pluginName() {\n\t\treturn 'OPChildPages';\n\t}\n\n\tstatic get buttonName() {\n\t\treturn OPChildPagesEditing.buttonName;\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileRepository from '@ckeditor/ckeditor5-upload/src/filerepository';\nimport OpUploadResourceAdapter from './op-upload-resource-adapter';\nimport {getOPResource} from './op-context/op-context';\nimport ImageUpload from '@ckeditor/ckeditor5-image/src/imageupload';\n\nexport default class OpUploadPlugin extends Plugin {\n\n    static get requires() {\n        return [FileRepository, ImageUpload];\n    }\n\n    static get pluginName() {\n        return 'OpUploadPlugin';\n    }\n\n    init() {\n        this.editor.plugins.get('FileRepository').createUploadAdapter = (loader) => {\n\t\t\tconst resource = getOPResource(this.editor);\n\t\t\treturn new OpUploadResourceAdapter(loader, resource, this.editor);\n\t\t}\n    }\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport Selection from '@ckeditor/ckeditor5-engine/src/model/selection';\n\nexport default class OPAttachmentListenerPlugin extends Plugin {\n\tstatic get pluginName() {\n\t\treturn 'OPAttachmentListener';\n\t}\n\n\tinit() {\n\t\tlet editor = this.editor;\n\n\t\teditor.model.on('op:attachment-removed', (_, urls) => {\n\t\t\tthis.removeDeletedImage(urls)\n\t\t});\n\t}\n\n\tremoveDeletedImage(urls) {\n\t\tlet root = this.editor.model.document.getRoot();\n\n\t\tfor (const child of Array.from(root.getChildren())) {\n\t\t\tif (child.name === 'image' && urls.indexOf(child.getAttribute('src')) > -1) {\n\t\t\t\tconst selection = new Selection( child, 'on' );\n\n\t\t\t\tthis.editor.model.deleteContent(selection);\n\t\t\t}\n\t\t}\n\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module essentials/essentials\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport Clipboard from '@ckeditor/ckeditor5-clipboard/src/clipboard';\nimport Enter from '@ckeditor/ckeditor5-enter/src/enter';\nimport ShiftEnter from '@ckeditor/ckeditor5-enter/src/shiftenter';\nimport Typing from '@ckeditor/ckeditor5-typing/src/typing';\nimport Undo from '@ckeditor/ckeditor5-undo/src/undo';\n\n/**\n * A plugin including all essential editing features. It represents a set of features that enables similar functionalities\n * to a `<textarea>` element.\n *\n * It includes:\n *\n * * {@link module:clipboard/clipboard~Clipboard},\n * * {@link module:enter/enter~Enter},\n * * {@link module:enter/shiftenter~ShiftEnter},\n * * {@link module:typing/typing~Typing},\n * * {@link module:undo/undo~Undo}.\n *\n * This plugin set does not define any block-level containers (such as {@link module:paragraph/paragraph~Paragraph}).\n * If your editor is supposed to handle block content, make sure to include it.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Essentials extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ Clipboard, Enter, ShiftEnter, Typing, Undo ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Essentials';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module autoformat/autoformat\n */\n\nimport BlockAutoformatEditing from './blockautoformatediting';\nimport InlineAutoformatEditing from './inlineautoformatediting';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * Includes a set of predefined autoformatting actions. For a detailed overview, check\n * the {@glink features/autoformat Autoformatting feature documentation}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Autoformat extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Autoformat';\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tafterInit() {\n\t\tthis._addListAutoformats();\n\t\tthis._addBasicStylesAutoformats();\n\t\tthis._addHeadingAutoformats();\n\t\tthis._addBlockQuoteAutoformats();\n\t}\n\n\t/**\n\t * Adds autoformatting related to the {@link module:list/list~List}.\n\t *\n\t * When typed:\n\t * - `* ` or `- ` &ndash; A paragraph will be changed to a bulleted list.\n\t * - `1. ` or `1) ` &ndash; A paragraph will be changed to a numbered list (\"1\" can be any digit or a list of digits).\n\t *\n\t * @private\n\t */\n\t_addListAutoformats() {\n\t\tconst commands = this.editor.commands;\n\n\t\tif ( commands.get( 'bulletedList' ) ) {\n\t\t\t// eslint-disable-next-line no-new\n\t\t\tnew BlockAutoformatEditing( this.editor, /^[*-]\\s$/, 'bulletedList' );\n\t\t}\n\n\t\tif ( commands.get( 'numberedList' ) ) {\n\t\t\t// eslint-disable-next-line no-new\n\t\t\tnew BlockAutoformatEditing( this.editor, /^\\d+[.|)]\\s$/, 'numberedList' );\n\t\t}\n\t}\n\n\t/**\n\t * Adds autoformatting related to the {@link module:basic-styles/bold~Bold},\n\t * {@link module:basic-styles/italic~Italic} and {@link module:basic-styles/code~Code}.\n\t *\n\t * When typed:\n\t * - `**foobar**` &ndash; `**` characters are removed and `foobar` is set to bold,\n\t * - `__foobar__` &ndash; `__` characters are removed and `foobar` is set to bold,\n\t * - `*foobar*` &ndash; `*` characters are removed and `foobar` is set to italic,\n\t * - `_foobar_` &ndash; `_` characters are removed and `foobar` is set to italic,\n\t * - ``` `foobar` &ndash; ``` ` ``` characters are removed and `foobar` is set to code.\n\t *\n\t * @private\n\t */\n\t_addBasicStylesAutoformats() {\n\t\tconst commands = this.editor.commands;\n\n\t\tif ( commands.get( 'bold' ) ) {\n\t\t\t/* eslint-disable no-new */\n\t\t\tnew InlineAutoformatEditing( this.editor, /(\\*\\*)([^*]+)(\\*\\*)$/g, 'bold' );\n\t\t\tnew InlineAutoformatEditing( this.editor, /(__)([^_]+)(__)$/g, 'bold' );\n\t\t\t/* eslint-enable no-new */\n\t\t}\n\n\t\tif ( commands.get( 'italic' ) ) {\n\t\t\t// The italic autoformatter cannot be triggered by the bold markers, so we need to check the\n\t\t\t// text before the pattern (e.g. `(?:^|[^\\*])`).\n\n\t\t\t/* eslint-disable no-new */\n\t\t\tnew InlineAutoformatEditing( this.editor, /(?:^|[^*])(\\*)([^*_]+)(\\*)$/g, 'italic' );\n\t\t\tnew InlineAutoformatEditing( this.editor, /(?:^|[^_])(_)([^_]+)(_)$/g, 'italic' );\n\t\t\t/* eslint-enable no-new */\n\t\t}\n\n\t\tif ( commands.get( 'code' ) ) {\n\t\t\t/* eslint-disable no-new */\n\t\t\tnew InlineAutoformatEditing( this.editor, /(`)([^`]+)(`)$/g, 'code' );\n\t\t\t/* eslint-enable no-new */\n\t\t}\n\t}\n\n\t/**\n\t * Adds autoformatting related to {@link module:heading/heading~Heading}.\n\t *\n\t * It is using a number at the end of the command name to associate it with the proper trigger:\n\t *\n\t * * `heading` with value `heading1` will be executed when typing `#`,\n\t * * `heading` with value `heading2` will be executed when typing `##`,\n\t * * ... up to `heading6` and `######`.\n\t *\n\t * @private\n\t */\n\t_addHeadingAutoformats() {\n\t\tconst command = this.editor.commands.get( 'heading' );\n\n\t\tif ( command ) {\n\t\t\tcommand.modelElements\n\t\t\t\t.filter( name => name.match( /^heading[1-6]$/ ) )\n\t\t\t\t.forEach( commandValue => {\n\t\t\t\t\tconst level = commandValue[ 7 ];\n\t\t\t\t\tconst pattern = new RegExp( `^(#{${ level }})\\\\s$` );\n\n\t\t\t\t\t// eslint-disable-next-line no-new\n\t\t\t\t\tnew BlockAutoformatEditing( this.editor, pattern, () => {\n\t\t\t\t\t\tthis.editor.execute( 'heading', { value: commandValue } );\n\t\t\t\t\t} );\n\t\t\t\t} );\n\t\t}\n\t}\n\n\t/**\n\t * Adds autoformatting related to {@link module:block-quote/blockquote~BlockQuote}.\n\t *\n\t * When typed:\n\t * * `> ` &ndash; A paragraph will be changed to a block quote.\n\t *\n\t * @private\n\t */\n\t_addBlockQuoteAutoformats() {\n\t\tif ( this.editor.commands.get( 'blockQuote' ) ) {\n\t\t\t// eslint-disable-next-line no-new\n\t\t\tnew BlockAutoformatEditing( this.editor, /^>\\s$/, 'blockQuote' );\n\t\t}\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/bold\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport BoldEditing from './bold/boldediting';\nimport BoldUI from './bold/boldui';\n\n/**\n * The bold feature.\n *\n * It loads the {@link module:basic-styles/bold/boldediting~BoldEditing bold editing feature}\n * and {@link module:basic-styles/bold/boldui~BoldUI bold UI feature}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Bold extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ BoldEditing, BoldUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Bold';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/code\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport CodeEditing from './code/codeediting';\nimport CodeUI from './code/codeui';\n\nimport '../theme/code.css';\n\n/**\n * The code feature.\n *\n * It loads the {@link module:basic-styles/code/codeediting~CodeEditing code editing feature}\n * and {@link module:basic-styles/code/codeui~CodeUI code UI feature}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Code extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ CodeEditing, CodeUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Code';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module basic-styles/italic\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ItalicEditing from './italic/italicediting';\nimport ItalicUI from './italic/italicui';\n\n/**\n * The italic feature.\n *\n * It loads the {@link module:basic-styles/italic/italicediting~ItalicEditing} and\n * {@link module:basic-styles/italic/italicui~ItalicUI} plugins.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Italic extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ItalicEditing, ItalicUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Italic';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module block-quote/blockquote\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport BlockQuoteEditing from './blockquoteediting';\nimport BlockQuoteUI from './blockquoteui';\n\n/**\n * The block quote plugin.\n *\n * It loads the {@link module:block-quote/blockquoteediting~BlockQuoteEditing block quote editing feature}\n * and {@link module:block-quote/blockquoteui~BlockQuoteUI block quote UI feature}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class BlockQuote extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ BlockQuoteEditing, BlockQuoteUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'BlockQuote';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module heading/heading\n */\n\nimport HeadingEditing from './headingediting';\nimport HeadingUI from './headingui';\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport '../theme/heading.css';\n\n/**\n * The headings feature.\n *\n * It loads the {@link module:heading/headingediting~HeadingEditing heading editing feature}\n * and {@link module:heading/headingui~HeadingUI heading UI feature}.\n *\n * For a detailed overview, check the {@glink features/headings Headings feature documentation}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Heading extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ HeadingEditing, HeadingUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Heading';\n\t}\n}\n\n/**\n * The configuration of the heading feature. Introduced by the {@link module:heading/headingediting~HeadingEditing} feature.\n *\n * Read more in {@link module:heading/heading~HeadingConfig}.\n *\n * @member {module:heading/heading~HeadingConfig} module:core/editor/editorconfig~EditorConfig#heading\n */\n\n/**\n * The configuration of the heading feature.\n * The option is used by the {@link module:heading/headingediting~HeadingEditing} feature.\n *\n *\t\tClassicEditor\n *\t\t\t.create( {\n * \t\t\t\theading: ... // Heading feature config.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface HeadingConfig\n */\n\n/**\n * The available heading options.\n *\n * The default value is:\n *\n *\t\tconst headingConfig = {\n *\t\t\toptions: [\n *\t\t\t\t{ model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },\n *\t\t\t\t{ model: 'heading1', view: 'h2', title: 'Heading 1', class: 'ck-heading_heading1' },\n *\t\t\t\t{ model: 'heading2', view: 'h3', title: 'Heading 2', class: 'ck-heading_heading2' },\n *\t\t\t\t{ model: 'heading3', view: 'h4', title: 'Heading 3', class: 'ck-heading_heading3' }\n *\t\t\t]\n *\t\t};\n *\n * It defines 3 levels of headings. In the editor model they will use `heading1`, `heading2`, and `heading3` elements.\n * Their respective view elements (so the elements output by the editor) will be: `h2`, `h3`, and `h4`. This means that\n * if you choose \"Heading 1\" in the headings dropdown the editor will turn the current block to `<heading1>` in the model\n * which will result in rendering (and outputting to data) the `<h2>` element.\n *\n * The `title` and `class` properties will be used by the `headings` dropdown to render available options.\n * Usually, the first option in the headings dropdown is the \"Paragraph\" option, hence it's also defined on the list.\n * However, you don't need to define its view representation because it's handled by\n * the {@link module:paragraph/paragraph~Paragraph} feature (which is required by\n * the {@link module:heading/headingediting~HeadingEditing} feature).\n *\n * You can **read more** about configuring heading levels and **see more examples** in\n * the {@glink features/headings Headings} guide.\n *\n * Note: In the model you should always start from `heading1`, regardless of how the headings are represented in the view.\n * That's assumption is used by features like {@link module:autoformat/autoformat~Autoformat} to know which element\n * they should use when applying the first level heading.\n *\n * The defined headings are also available as values passed to `heading` command under their model names.\n * For example, the below code will apply `<heading1>` to the current selection:\n *\n *\t\teditor.execute( 'heading', { value: 'heading1' } );\n *\n * @member {Array.<module:heading/heading~HeadingOption>} module:heading/heading~HeadingConfig#options\n */\n\n/**\n * Heading option descriptor.\n *\n * @typedef {Object} module:heading/heading~HeadingOption\n * @property {String} model Name of the model element to convert.\n * @property {module:engine/view/elementdefinition~ElementDefinition} view Definition of a view element to convert from/to.\n * @property {String} title The user-readable title of the option.\n * @property {String} class The class which will be added to the dropdown item representing this option.\n * @property {String} [icon] Icon used by {@link module:heading/headingbuttonsui~HeadingButtonsUI}. It can be omitted when using\n * the default configuration.\n * @extends module:engine/conversion/conversion~ConverterDefinition\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/image\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageEditing from '../src/image/imageediting';\nimport Widget from '@ckeditor/ckeditor5-widget/src/widget';\nimport ImageTextAlternative from './imagetextalternative';\n\nimport '../theme/image.css';\n\n/**\n * The image plugin.\n *\n * Uses the {@link module:image/image/imageediting~ImageEditing}.\n *\n * For a detailed overview, check the {@glink features/image image feature} documentation.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Image extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageEditing, Widget, ImageTextAlternative ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Image';\n\t}\n}\n\n/**\n * The configuration of the image features. Used by the image features in the `@ckeditor/ckeditor5-image` package.\n *\n * Read more in {@link module:image/image~ImageConfig}.\n *\n * @member {module:image/image~ImageConfig} module:core/editor/editorconfig~EditorConfig#image\n */\n\n/**\n * The configuration of the image features. Used by the image features in the `@ckeditor/ckeditor5-image` package.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\timage: ... // Image feature options.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface ImageConfig\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagecaption\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageCaptionEditing from './imagecaption/imagecaptionediting';\n\nimport '../theme/imagecaption.css';\n\n/**\n * The image caption plugin.\n *\n * For a detailed overview, check the {@glink features/image#image-captions image caption} documentation.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageCaption extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageCaptionEditing ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageCaption';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module image/imagestyle\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport ImageStyleEditing from './imagestyle/imagestyleediting';\nimport ImageStyleUI from './imagestyle/imagestyleui';\n\n/**\n * The image style plugin.\n *\n * It loads the {@link module:image/imagestyle/imagestyleediting~ImageStyleEditing}\n * and {@link module:image/imagestyle/imagestyleui~ImageStyleUI} plugins.\n *\n * For a detailed overview, check the {@glink features/image#image-styles image styles} documentation.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class ImageStyle extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ImageStyleEditing, ImageStyleUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'ImageStyle';\n\t}\n}\n\n/**\n * Available image styles.\n *\n * The default value is:\n *\n *\t\tconst imageConfig = {\n *\t\t\tstyles: [ 'full', 'side' ]\n *\t\t};\n *\n * which configures two default styles:\n *\n *  * the \"full\" style which does not apply any class, e.g. for images styled to span 100% width of the content,\n *  * the \"side\" style with the `.image-style-side` CSS class.\n *\n * See {@link module:image/imagestyle/utils~defaultStyles} to learn more about default\n * styles provided by the image feature.\n *\n * The {@link module:image/imagestyle/utils~defaultStyles default styles} can be customized,\n * e.g. to change the icon, title or CSS class of the style. The feature also provides several\n * {@link module:image/imagestyle/utils~defaultIcons default icons} to choose from.\n *\n *\t\timport customIcon from 'custom-icon.svg';\n *\n *\t\t// ...\n *\n *\t\tconst imageConfig = {\n *\t\t\tstyles: [\n *\t\t\t\t// This will only customize the icon of the \"full\" style.\n *\t\t\t\t// Note: 'right' is one of default icons provided by the feature.\n *\t\t\t\t{ name: 'full', icon: 'right' },\n *\n *\t\t\t\t// This will customize the icon, title and CSS class of the default \"side\" style.\n *\t\t\t\t{ name: 'side', icon: customIcon, title: 'My side style', class: 'custom-side-image' }\n *\t\t\t]\n *\t\t};\n *\n * If none of the default styles is good enough, it is possible to define independent custom styles, too:\n *\n *\t\timport fullSizeIcon from '@ckeditor/ckeditor5-core/theme/icons/object-center.svg';\n *\t\timport sideIcon from '@ckeditor/ckeditor5-core/theme/icons/object-right.svg';\n *\n *\t\t// ...\n *\n *\t\tconst imageConfig = {\n *\t\t\tstyles: [\n *\t\t\t\t// A completely custom full size style with no class, used as a default.\n *\t\t\t\t{ name: 'fullSize', title: 'Full size', icon: fullSizeIcon, isDefault: true },\n *\n *\t\t\t\t{ name: 'side', title: 'To the side', icon: sideIcon, className: 'side-image' }\n *\t\t\t]\n *\t\t};\n *\n * Note: Setting `title` to one of {@link module:image/imagestyle/imagestyleui~ImageStyleUI#localizedDefaultStylesTitles}\n * will automatically translate it to the language of the editor.\n *\n * Read more about styling images in the {@glink features/image#image-styles Image styles guide}.\n *\n * The feature creates commands based on defined styles, so you can change the style of a selected image by executing\n * the following command:\n *\n *\t\teditor.execute( 'imageStyle' { value: 'side' } );\n *\n * The feature also creates buttons that execute the commands. So, assuming that you use the\n * default image styles setting, you can {@link module:image/image~ImageConfig#toolbar configure the image toolbar}\n * (or any other toolbar) to contain these options:\n *\n *\t\tconst imageConfig = {\n *\t\t\ttoolbar: [ 'imageStyle:full', 'imageStyle:side' ]\n *\t\t};\n *\n * @member {Array.<module:image/imagestyle/imagestyleediting~ImageStyleFormat>} module:image/image~ImageConfig#styles\n */\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module link/link\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport LinkEditing from './linkediting';\nimport LinkUI from './linkui';\n\n/**\n * The link plugin. It introduces the Link and Unlink buttons and the <kbd>Ctrl+K</kbd> keystroke.\n *\n * It loads the {@link module:link/linkediting~LinkEditing link editing feature}\n * and {@link module:link/linkui~LinkUI link UI feature}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Link extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ LinkEditing, LinkUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Link';\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module list/list\n */\n\nimport ListEditing from './listediting';\nimport ListUI from './listui';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\n/**\n * The list feature.\n *\n * It loads the {@link module:list/listediting~ListEditing list editing feature}\n * and {@link module:list/listui~ListUI list UI feature}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class List extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ ListEditing, ListUI ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'List';\n\t}\n}\n","// This SVG file import will be handled by webpack's raw-text loader.\n// This means that imageIcon will hold the source SVG.\nimport imageIcon from './../../icons/help.svg';\n\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nexport default class OPHelpLinkPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPHelpLinkPlugin';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst model = editor.model;\n\t\tconst helpURL = editor.config.get('openProject.helpURL');\n\n\t\teditor.ui.componentFactory.add( 'openProjectShowFormattingHelp', locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: window.I18n.t('js.inplace.link_formatting_help'),\n\t\t\t\ticon: imageIcon,\n\t\t\t\ttooltip: true\n\t\t\t} );\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on( 'execute', () => {\n\t\t\t\twindow.open(helpURL, '_blank');\n\t\t\t} );\n\n\t\t\treturn view;\n\t\t} );\n\t}\n}\n","\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport CodeBlockEditing from './code-block-editing';\nimport CodeBlockToolbar from './code-block-toolbar';\n\nexport default class CodeBlockPlugin extends Plugin {\n\tstatic get pluginName() {\n\t\treturn 'CodeBlock';\n\t}\n\n\tstatic get requires() {\n\t\treturn [ CodeBlockEditing, CodeBlockToolbar ];\n\t}\n}\n","// This SVG file import will be handled by webpack's raw-text loader.\n// This means that imageIcon will hold the source SVG.\nimport imageIcon from '../icons/preview.svg';\n\nimport ButtonView from '@ckeditor/ckeditor5-ui/src/button/buttonview';\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport FileDialogButtonView from '@ckeditor/ckeditor5-upload/src/ui/filedialogbuttonview';\nimport {getOPPath, getOPPreviewContext, getOPService} from './op-context/op-context';\n\nexport default class OPPreviewPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPPreview';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tlet previewing = false;\n\t\tlet unregisterPreview = null;\n\t\tlet currentlyDisabled = [];\n\n\t\teditor.ui.componentFactory.add( 'preview', locale => {\n\t\t\tconst view = new ButtonView( locale );\n\n\t\t\tview.set( {\n\t\t\t\tlabel: this.label,\n\t\t\t\ticon: imageIcon,\n\t\t\t\ttooltip: true,\n\t\t\t} );\n\n\t\t\tlet toolbarItems = function() {\n\t\t\t\tif (!editor.ui.view.toolbar) {\n\t\t\t\t\treturn [];\n\t\t\t\t}\n\n\t\t\t\treturn editor.ui.view.toolbar.items._items;\n\t\t\t};\n\n\t\t\tlet disableItems = function() {\n\t\t\t\tjQuery.each(toolbarItems(), function(index, item) {\n\t\t\t\t\tlet toDisable = item;\n\n\t\t\t\t\tif (item instanceof FileDialogButtonView) {\n\t\t\t\t\t\ttoDisable = item.buttonView;\n\t\t\t\t\t} else if (item === view || !item.hasOwnProperty('isEnabled')) {\n\t\t\t\t\t\ttoDisable = null;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (!toDisable) {\n\t\t\t\t\t\t// do nothing\n\t\t\t\t\t} else if (toDisable.isEnabled) {\n\t\t\t\t\t\ttoDisable.isEnabled = false;\n\t\t\t\t\t} else {\n\t\t\t\t\t\tcurrentlyDisabled.push(toDisable);\n\t\t\t\t\t}\n\t\t\t\t});\n\t\t\t};\n\n\t\t\tlet enableItems = function() {\n\t\t\t\tjQuery.each(toolbarItems(), function(index, item) {\n\t\t\t\t\tlet toEnable = item;\n\n\t\t\t\t\tif (item instanceof FileDialogButtonView) {\n\t\t\t\t\t\ttoEnable = item.buttonView;\n\t\t\t\t\t}\n\n\t\t\t\t\tif (currentlyDisabled.indexOf(toEnable) < 0) {\n\t\t\t\t\t\ttoEnable.isEnabled = true\n\t\t\t\t\t}\n\t\t\t\t});\n\n\t\t\t\tcurrentlyDisabled.length = 0;\n\t\t\t};\n\n\t\t\tlet showPreview = function(preview) {\n\t\t\t\tlet $editable = jQuery(editor.element);\n\t\t\t\tlet $mainEditor = $editable.find('.ck-editor__main');\n\t\t\t\tlet $reference;\n\n\t\t\t\tif ($mainEditor.length) {\n\t\t\t\t\t$reference = $mainEditor;\n\t\t\t\t} else {\n\t\t\t\t\t$reference = $editable;\n\t\t\t\t}\n\n\t\t\t\tlet $previewWrapper = jQuery('<div class=\"ck-editor__preview\"></div>');\n\t\t\t\t$reference.siblings('.ck-editor__preview').remove();\n\n\t\t\t\tconst previewService = getOPService(editor, 'ckEditorPreview');\n\t\t\t\tunregisterPreview = previewService.render($previewWrapper[0], preview);\n\n\t\t\t\t$reference.hide();\n\t\t\t\t$reference.after($previewWrapper);\n\n\t\t\t\tdisableItems();\n\t\t\t};\n\n\t\t\tlet getAndShowPreview = function() {\n\t\t\t\tlet link = getOPPreviewContext(editor);\n\t\t\t\tlet url = getOPPath(editor).api.v3.previewMarkup(link);\n\n\t\t\t\tjQuery\n\t\t\t\t\t.ajax({\n\t\t\t\t\t\tdata: editor.getData(),\n\t\t\t\t\t\turl: url,\n\t\t\t\t\t\tresponse_type: 'text',\n\t\t\t\t\t\tcontentType: 'text/plain; charset=UTF-8',\n\t\t\t\t\t\tmethod: 'POST',\n\t\t\t\t\t}).done(showPreview);\n\t\t\t};\n\n\t\t\tlet disablePreviewing = function() {\n\t\t\t\tlet $editable = jQuery(editor.element);\n\t\t\t\tlet $mainEditor = $editable.find('.ck-editor__main');\n\n\t\t\t\tunregisterPreview();\n\t\t\t\t$mainEditor.siblings('.ck-editor__preview').remove();\n\t\t\t\t$mainEditor.show();\n\n\t\t\t\tenableItems();\n\t\t\t};\n\n\n\t\t\t// Callback executed once the image is clicked.\n\t\t\tview.on('execute', () => {\n\t\t\t\tif (previewing) {\n\t\t\t\t\tpreviewing = false;\n\n\t\t\t\t\tdisablePreviewing();\n\t\t\t\t} else {\n\t\t\t\t\tpreviewing = true;\n\n\t\t\t\t\tgetAndShowPreview();\n\t\t\t\t}\n\t\t\t});\n\n\t\t\treturn view;\n\t\t} );\n\t}\n\n\tget label() {\n\t\treturn window.I18n.t('js.editor.preview');\n\t}\n}\n","/**\n * @license Copyright (c) 2003-2017, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\nimport CommonMarkDataProcessor from './commonmarkdataprocessor';\n\n// Simple plugin which loads the data processor.\n// eslint-disable-next-line no-unused-vars\nexport default function CommonMarkPlugin( editor ) {\n\teditor.data.processor = new CommonMarkDataProcessor();\n}\n\n","/**\n * @license Copyright (c) 2003-2018, CKSource - Frederico Knabben. All rights reserved.\n * For licensing, see LICENSE.md.\n */\n\n/**\n * @module table/table\n */\n\nimport Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport TableEditing from './tableediting';\nimport TableUI from './tableui';\nimport Widget from '@ckeditor/ckeditor5-widget/src/widget';\n\nimport '../theme/table.css';\n\n/**\n * The table plugin.\n *\n * It loads the {@link module:table/tableediting~TableEditing table editing feature}\n * and {@link module:table/tableui~TableUI table UI feature}.\n *\n * For a detailed overview, check the {@glink features/table Table feature documentation}.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class Table extends Plugin {\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get requires() {\n\t\treturn [ TableEditing, TableUI, Widget ];\n\t}\n\n\t/**\n\t * @inheritDoc\n\t */\n\tstatic get pluginName() {\n\t\treturn 'Table';\n\t}\n}\n\n/**\n * The configuration of the table features. Used by the table features in the `@ckeditor/ckeditor5-table` package.\n *\n *\t\tClassicEditor\n *\t\t\t.create( editorElement, {\n * \t\t\t\ttable: ... // Table feature options.\n *\t\t\t} )\n *\t\t\t.then( ... )\n *\t\t\t.catch( ... );\n *\n * See {@link module:core/editor/editorconfig~EditorConfig all editor options}.\n *\n * @interface TableConfig\n */\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\n\nimport { createDropdown, addToolbarToDropdown } from '@ckeditor/ckeditor5-ui/src/dropdown/utils';\n\nimport {opMacroPlugins} from \"../op-plugins\";\n\n/**\n * Adding a drop down list of macros to the toolbar.\n *\n * @extends module:core/plugin~Plugin\n */\nexport default class OPMacroListPlugin extends Plugin {\n\tinit() {\n\t\tconst editor = this.editor;\n\t\tconst disabledPluginNames = (editor.config.get('removePlugins') || []).map(p => p.pluginName)\n\t\tconst dropdownTooltip = window.I18n.t('js.editor.macro.dropdown.chose_macro');\n\n\t\t// Register UI component.\n\t\teditor.ui.componentFactory.add( 'macroList', locale => {\n\t\t\tconst dropdownItems = [];\n\t\t\tfor ( const macroPlugin of opMacroPlugins ) {\n\t\t\t\tif (disabledPluginNames.indexOf(macroPlugin.pluginName) !== -1) {\n\t\t\t\t\tcontinue;\n\t\t\t\t}\n\n\t\t\t\tconst listItem = editor.ui.componentFactory.create(macroPlugin.buttonName);\n\t\t\t\tdropdownItems.push(listItem);\n\t\t\t}\n\t\t\tconst dropdownView = createDropdown( locale );\n\n\t\t\taddToolbarToDropdown(dropdownView, dropdownItems);\n\t\t\tdropdownView.buttonView.set( {\n\t\t\t\tisOn: false,\n\t\t\t\twithText: true,\n\t\t\t\ttooltip: dropdownTooltip,\n\t\t\t\tlabel: window.I18n.t('js.editor.macro.dropdown.macros')\n\t\t\t} );\n\t\t\tdropdownView.toolbarView.isVertical = true;\n\t\t\tdropdownView.toolbarView.className = 'op-macro-list-button'\n\n\t\t\treturn dropdownView;\n\t\t} );\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport AtJsEnterCommand from './atjs-enter-command';\n\nexport class AtJsPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'atjs';\n\t}\n\n\tstatic get requires() {\n\t\treturn [ AtJsEnterCommand ];\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\teditor.commands.get(\"enter\").destroy();\n\t\teditor.commands.add(\"enter\", new AtJsEnterCommand(editor) );\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport {setupAtJs} from './op-atjs-plugin/atjs-setup';\n\nexport default class OPLinkingWpPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPLinkingWp';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\n\n\t\tlet options = {\n\t\t\tignorePrefix: /user\\#/,\n\t\t\tremoteUrl: function(query, func) {\n\t\t\t\tlet url = window.OpenProject.urlRoot + `/work_packages/auto_complete.json`;\n\n\t\t\t\tjQuery.getJSON(url, {q: query, scope: 'all'}, func)\n\t\t\t},\n\t\t\tremoteDataPreparation: function(data) {\n\t\t\t\tfor (let i = data.length - 1; i >= 0; i--) {\n\t\t\t\t\tdata[i]['id_subject'] = data[i]['id'].toString() + ' ' + data[i]['subject'];\n\t\t\t\t}\n\n\t\t\t\treturn data;\n\t\t\t}\n\t\t};\n\n\t\tsetupAtJs(editor, options);\n\t}\n}\n","import Plugin from '@ckeditor/ckeditor5-core/src/plugin';\nimport {setupAtJs} from './op-atjs-plugin/atjs-setup';\nimport {getOPService, getOPResource, getOPPath} from './op-context/op-context';\n\nexport default class OPMentioningPlugin extends Plugin {\n\n\tstatic get pluginName() {\n\t\treturn 'OPMentioning';\n\t}\n\n\tinit() {\n\t\tconst editor = this.editor;\n\n\t\tlet options = {\n\t\t\tsearchKey: 'id_principal',\n\t\t\tdisplayTpl: '<li data-value=\"#{_type}#${id}\">${name}</li>',\n\t\t\tinsertTpl: \"${typePrefix}#${id}\",\n\t\t\tstartWithSpace: true,\n\t\t\tsuffix: '',\n\t\t\tacceptSpaceBar: true,\n\t\t\thighlightFirst: true,\n\t\t\tat: '@',\n\t\t\tremoteDataPreparation: function(data) {\n\t\t\t\tconst principals = data[\"_embedded\"][\"elements\"];\n\t\t\t\tconst sanitizer = getOPService(editor, 'htmlSanitizeService');\n\n\t\t\t\tfor (let i = principals.length - 1; i >= 0; i--) {\n\t\t\t\t\tprincipals[i]['id_principal'] = sanitizer.sanitize(principals[i]['id'].toString() + ' ' + principals[i]['name']);\n\t\t\t\t\tprincipals[i]['typePrefix'] = principals[i]['_type'].toLowerCase();\n\t\t\t\t}\n\n\t\t\t\treturn principals;\n\t\t\t},\n\t\t\tisSupportedContext: function() {\n\t\t\t\tlet context = getOPResource(editor);\n\t\t\t\treturn context && context._type === 'WorkPackage';\n\t\t\t},\n\t\t\tremoteUrl: function(query, func) {\n\t\t\t\tconst resource = getOPResource(editor);\n\t\t\t\tconst project_id = resource.project.idFromLink;\n\t\t\t\tconst url = getOPPath(editor).api.v3.principals(project_id, query);\n\n                jQuery.getJSON(url, func);\n\t\t\t}\n\t\t};\n;\n\t\tsetupAtJs(editor, options);\n\t}\n}\n","import {opImageUploadPlugins, opMacroPlugins} from './op-plugins';\n\nexport function configurationCustomizer(editorClass) {\n\treturn (wrapper, configuration) => {\n\t\tconst context = configuration.openProject.context;\n\n\t\t// We're going to remove some plugins from the default configuration\n\t\t// when we detect they are unsupported in the current context\n\t\tconfiguration.removePlugins = configuration.removePlugins || [];\n\n\t\t// Disable uploading if there is no resource with uploadAttachment\n\t\tconst resource = context.resource;\n\t\tif (!(resource && resource.uploadAttachments)) {\n\t\t\tconfiguration.removePlugins.push(...opImageUploadPlugins.map(el => el.pluginName))\n\t\t}\n\n\t\t// Disable macros entirely\n\t\tif (context.macros === false) {\n\t\t\tconfiguration.removePlugins.push(...opMacroPlugins.map(el => el.pluginName))\n\t\t}\n\n\t\t// Enable selective macros\n\t\tif (Array.isArray(context.macros)) {\n\t\t\tconst disabledMacros = opMacroPlugins.filter(plugin => context.macros.indexOf(plugin.pluginName) === -1);\n\t\t\tconfiguration.removePlugins.push(...disabledMacros);\n\t\t}\n\n\t\t// Return the original promise for instance creation\n\t\treturn editorClass.create(wrapper, configuration);\n\t};\n}\n","export const defaultConfig = {\n\theading: {\n\t\toptions: [\n\t\t\t{ model: 'paragraph', title: 'Paragraph', class: 'ck-heading_paragraph' },\n\t\t\t{ model: 'heading1', view: 'h1', title: 'Heading 1', class: 'ck-heading_heading1' },\n\t\t\t{ model: 'heading2', view: 'h2', title: 'Heading 2', class: 'ck-heading_heading2' },\n\t\t\t{ model: 'heading3', view: 'h3', title: 'Heading 3', class: 'ck-heading_heading3' },\n\t\t\t{ model: 'heading4', view: 'h4', title: 'Heading 4', class: 'ck-heading_heading4' },\n\t\t\t{ model: 'heading5', view: 'h5', title: 'Heading 5', class: 'ck-heading_heading5' }\n\t\t]\n\t},\n\ttoolbar: {\n\t\t// Will be defined by each build\n\t},\n\tOPMacroEmbeddedTable: {\n\t\ttoolbar: [\n\t\t\t'opEditEmbeddedTableQuery',\n\t\t]\n\t},\n\tOPMacroWpButton: {\n\t\ttoolbar: [\n\t\t\t'opEditWpMacroButton',\n\t\t]\n\t},\n\tOPWikiIncludePage: {\n\t\ttoolbar: [\n\t\t\t'opEditWikiIncludeMacroButton',\n\t\t]\n\t},\n\tOPCodeBlock: {\n\t\ttoolbar: [\n\t\t\t'opEditCodeBlock',\n\t\t]\n\t},\n\tOPChildPages: {\n\t\ttoolbar: [\n\t\t\t'opEditChildPagesMacroButton',\n\t\t]\n\t},\n\timage: {\n\t\ttoolbar: [\n\t\t\t'imageStyle:full',\n\t\t\t'|',\n\t\t\t'imageTextAlternative'\n\t\t]\n\t},\n\ttable: {\n\t\ttoolbar: [ 'tableColumn', 'tableRow' ]\n\t},\n\tlanguage: 'en'\n};\n","import ClassicEditorBase from '@ckeditor/ckeditor5-editor-classic/src/classiceditor';\nimport {configurationCustomizer} from './op-config-customizer';\nimport {builtinPlugins} from './op-plugins';\nimport {defaultConfig} from \"./op-ckeditor-config\";\n\nexport class ConstrainedEditor extends ClassicEditorBase {}\nexport class FullEditor extends ClassicEditorBase {}\n\n// Export the two common interfaces\nwindow.OPConstrainedEditor = ConstrainedEditor;\nwindow.OPClassicEditor = FullEditor;\n\nFullEditor.createCustomized = configurationCustomizer(FullEditor);\nFullEditor.builtinPlugins = builtinPlugins;\nFullEditor.defaultConfig = Object.assign({}, defaultConfig);\nFullEditor.defaultConfig.toolbar = {\n\t\titems: [\n\t\t\t'heading',\n\t\t\t'|',\n\t\t\t'bold',\n\t\t\t'italic',\n\t\t\t'code',\n\t\t\t'insertCodeBlock',\n\t\t\t'link',\n\t\t\t'bulletedList',\n\t\t\t'numberedList',\n\t\t\t'imageUpload',\n\t\t\t'blockQuote',\n\t\t\t'|',\n\t\t\t'insertTable',\n\t\t\t'|',\n\t\t\t'macroList',\n\t\t\t'|',\n\t\t\t'undo',\n\t\t\t'redo',\n\t\t\t'openProjectShowFormattingHelp',\n\t\t\t'|',\n\t\t\t'preview'\n\t\t]\n};\n\nConstrainedEditor.createCustomized = configurationCustomizer(ConstrainedEditor);\nConstrainedEditor.builtinPlugins = builtinPlugins;\nConstrainedEditor.defaultConfig = Object.assign({}, defaultConfig);\nConstrainedEditor.defaultConfig.toolbar = {\n\titems: [\n\t\t'bold',\n\t\t'italic',\n\t\t'code',\n\t\t'link',\n\t\t'bulletedList',\n\t\t'numberedList',\n\t\t'openProjectShowFormattingHelp',\n\t\t'preview'\n\t]\n};\n"],"sourceRoot":""}