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module CodeRay
# = Duo
#
# A Duo is a convenient way to use CodeRay. You just create a Duo,
# giving it a lang (language of the input code) and a format (desired
# output format), and call Duo#highlight with the code.
#
# Duo makes it easy to re-use both scanner and encoder for a repetitive
# task. It also provides a very easy interface syntax:
#
# require 'coderay'
# CodeRay::Duo[:python, :div].highlight 'import this'
#
# Until you want to do uncommon things with CodeRay, I recommend to use
# this method, since it takes care of everything.
class Duo
attr_accessor :lang, :format, :options
# Create a new Duo, holding a lang and a format to highlight code.
#
# simple:
# CodeRay::Duo[:ruby, :html].highlight 'bla 42'
#
# with options:
# CodeRay::Duo[:ruby, :html, :hint => :debug].highlight '????::??'
#
# alternative syntax without options:
# CodeRay::Duo[:ruby => :statistic].encode 'class << self; end'
#
# alternative syntax with options:
# CodeRay::Duo[{ :ruby => :statistic }, :do => :something].encode 'abc'
#
# The options are forwarded to scanner and encoder
# (see CodeRay.get_scanner_options).
def initialize lang = nil, format = nil, options = {}
if format.nil? && lang.is_a?(Hash) && lang.size == 1
@lang = lang.keys.first
@format = lang[@lang]
else
@lang = lang
@format = format
end
@options = options
end
class << self
# To allow calls like Duo[:ruby, :html].highlight.
alias [] new
end
# The scanner of the duo. Only created once.
def scanner
@scanner ||= CodeRay.scanner @lang, CodeRay.get_scanner_options(@options)
end
# The encoder of the duo. Only created once.
def encoder
@encoder ||= CodeRay.encoder @format, @options
end
# Tokenize and highlight the code using +scanner+ and +encoder+.
def encode code, options = {}
options = @options.merge options
encoder.encode(code, @lang, options)
end
alias highlight encode
# Allows to use Duo like a proc object:
#
# CodeRay::Duo[:python => :yaml].call(code)
#
# or, in Ruby 1.9 and later:
#
# CodeRay::Duo[:python => :yaml].(code)
alias call encode
end
end
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