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67 lines
2.5 KiB
67 lines
2.5 KiB
#-- encoding: UTF-8
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#-- copyright
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# OpenProject is an open source project management software.
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# Copyright (C) 2012-2020 the OpenProject GmbH
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License version 3.
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#
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# OpenProject is a fork of ChiliProject, which is a fork of Redmine. The copyright follows:
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# Copyright (C) 2006-2017 Jean-Philippe Lang
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# Copyright (C) 2010-2013 the ChiliProject Team
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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#
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# See docs/COPYRIGHT.rdoc for more details.
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#++
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module OpenProject
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module SyntaxHighlighting
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class << self
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# Highlights +text+ as the content of +filename+
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# Should not return line numbers nor outer pre tag
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# use CodeRay to scan normal text, since it's smart enough to find
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# the correct source encoding before passing it to ERB::Util.html_escape
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def highlight_by_filename(text, filename)
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language = guess_lexer(text, filename)
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highlight_by_language(text, language)
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end
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# Highlights +text+ using +language+ syntax
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def highlight_by_language(text, language, formatter = Rouge::Formatters::HTML.new)
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Rouge.highlight(text, language, formatter).html_safe
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end
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##
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# Guesses the appropriate lexer for the given text using rouge's guesser
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# Can be used to extract information using the lexer's name, tag, desc methods
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def guess_lexer(text, filename = nil)
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guessers = [Rouge::Guessers::Source.new(text)]
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guessers << Rouge::Guessers::Filename.new(filename) if filename.present?
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begin
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Rouge::Lexer::guess guessers: guessers
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rescue StandardError => e
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if !e.message.nil? && e.message == 'Ambiguous guess: can\'t decide between ["html", "xml"]'
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Rouge::Lexers::HTML.new
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else
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raise e
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end
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end
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end
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end
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end
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end
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