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88 lines
2.5 KiB
88 lines
2.5 KiB
18 years ago
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module CodeRay
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# = Duo
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#
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# $Id: scanner.rb 123 2006-03-21 14:46:34Z murphy $
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#
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# A Duo is a convenient way to use CodeRay. You just create a Duo,
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# giving it a lang (language of the input code) and a format (desired
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# output format), and call Duo#highlight with the code.
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#
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# Duo makes it easy to re-use both scanner and encoder for a repetitive
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# task. It also provides a very easy interface syntax:
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#
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# require 'coderay'
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# CodeRay::Duo[:python, :div].highlight 'import this'
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#
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# Until you want to do uncommon things with CodeRay, I recommend to use
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# this method, since it takes care of everything.
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class Duo
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attr_accessor :lang, :format, :options
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# Create a new Duo, holding a lang and a format to highlight code.
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#
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# simple:
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# CodeRay::Duo[:ruby, :page].highlight 'bla 42'
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#
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# streaming:
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# CodeRay::Duo[:ruby, :page].highlight 'bar 23', :stream => true
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#
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# with options:
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# CodeRay::Duo[:ruby, :html, :hint => :debug].highlight '????::??'
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#
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# alternative syntax without options:
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# CodeRay::Duo[:ruby => :statistic].encode 'class << self; end'
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#
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# alternative syntax with options:
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# CodeRay::Duo[{ :ruby => :statistic }, :do => :something].encode 'abc'
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#
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# The options are forwarded to scanner and encoder
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# (see CodeRay.get_scanner_options).
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def initialize lang = nil, format = nil, options = {}
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if format == nil and lang.is_a? Hash and lang.size == 1
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@lang = lang.keys.first
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@format = lang[@lang]
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else
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@lang = lang
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@format = format
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end
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@options = options
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end
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class << self
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# To allow calls like Duo[:ruby, :html].highlight.
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alias [] new
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end
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# The scanner of the duo. Only created once.
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def scanner
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@scanner ||= CodeRay.scanner @lang, CodeRay.get_scanner_options(@options)
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end
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# The encoder of the duo. Only created once.
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def encoder
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@encoder ||= CodeRay.encoder @format, @options
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end
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# Tokenize and highlight the code using +scanner+ and +encoder+.
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#
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# If the :stream option is set, the Duo will go into streaming mode,
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# saving memory for the cost of time.
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def encode code, options = { :stream => false }
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stream = options.delete :stream
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options = @options.merge options
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if stream
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encoder.encode_stream(code, @lang, options)
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else
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scanner.code = code
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encoder.encode_tokens(scanner.tokenize, options)
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end
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end
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alias highlight encode
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end
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end
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