зеркало из https://github.com/github/ruby.git
77 строки
1.6 KiB
Ruby
77 строки
1.6 KiB
Ruby
##
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# The YAML module allows you to use one of the two YAML engines that ship with
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# ruby. By default Psych is used but the old and unmaintained Syck may be
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# chosen.
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#
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# See Psych or Syck for usage and documentation.
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#
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# To set the YAML engine to syck:
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#
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# YAML::ENGINE.yamler = 'syck'
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#
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# To set the YAML engine back to psych:
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#
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# YAML::ENGINE.yamler = 'psych'
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module YAML
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class EngineManager # :nodoc:
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attr_reader :yamler
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def initialize
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@yamler = nil
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end
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def syck?
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'syck' == @yamler
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end
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def yamler= engine
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raise(ArgumentError, "bad engine") unless %w{syck psych}.include?(engine)
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require engine unless (engine == 'syck' ? Syck : Psych).const_defined?(:VERSION)
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::Object.class_eval <<-eorb, __FILE__, __LINE__ + 1
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remove_const 'YAML'
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YAML = #{engine.capitalize}
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remove_method :to_yaml
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alias :to_yaml :#{engine}_to_yaml
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eorb
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@yamler = engine
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engine
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end
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end
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##
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# Allows changing the current YAML engine. See YAML for details.
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ENGINE = YAML::EngineManager.new
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end
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if defined?(Psych)
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engine = 'psych'
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elsif defined?(Syck)
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engine = 'syck'
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else
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begin
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require 'psych'
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engine = 'psych'
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rescue LoadError
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warn "#{caller[0]}:"
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warn "It seems your ruby installation is missing psych (for YAML output)."
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warn "To eliminate this warning, please install libyaml and reinstall your ruby."
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require 'syck'
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engine = 'syck'
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end
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end
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module Syck
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ENGINE = YAML::ENGINE
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end
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module Psych
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ENGINE = YAML::ENGINE
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end
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YAML::ENGINE.yamler = engine
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