82 lines
2.3 KiB
Ruby
82 lines
2.3 KiB
Ruby
module CodeRay
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# = Duo
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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, :html].highlight 'bla 42'
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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? && lang.is_a?(Hash) && 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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def encode code, options = {}
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options = @options.merge options
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encoder.encode(code, @lang, options)
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end
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alias highlight encode
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# Allows to use Duo like a proc object:
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#
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# CodeRay::Duo[:python => :yaml].call(code)
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#
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# or, in Ruby 1.9 and later:
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#
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# CodeRay::Duo[:python => :yaml].(code)
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alias call encode
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end
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end
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