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* lib/yaml.rb: load psych only when syck is not loaded.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@32044 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
This commit is contained in:
naruse 2011-06-13 03:55:00 +00:00
parent 8318a14cc4
commit 60947ded03
2 changed files with 20 additions and 9 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Mon Jun 13 12:51:51 2011 NARUSE, Yui <naruse@ruby-lang.org>
* lib/yaml.rb: load psych only when syck is not loaded.
Mon Jun 13 12:23:39 2011 NARUSE, Yui <naruse@ruby-lang.org>
Mon Jun 13 12:23:39 2011 NARUSE, Yui <naruse@ruby-lang.org>

25
lib/yaml.rb
View file

@ -13,7 +13,7 @@ module YAML
def yamler= engine
raise(ArgumentError, "bad engine") unless %w{syck psych}.include?(engine)
require engine
require engine unless (engine == 'syck' ? Syck : Psych).const_defined?(:VERSION)
Object.class_eval <<-eorb, __FILE__, __LINE__ + 1
remove_const 'YAML'
@ -30,16 +30,23 @@ module YAML
ENGINE = YAML::EngineManager.new
end
begin
require 'psych'
rescue LoadError
warn "#{caller[0]}:"
warn "It seems your ruby installation is missing psych (for YAML output)."
warn "To eliminate this warning, please install libyaml and reinstall your ruby."
if defined?(Psych)
engine = 'psych'
elsif defined?(Syck)
engine = 'syck'
else
begin
require 'psych'
engine = 'psych'
rescue LoadError
warn "#{caller[0]}:"
warn "It seems your ruby installation is missing psych (for YAML output)."
warn "To eliminate this warning, please install libyaml and reinstall your ruby."
require 'syck'
engine = 'syck'
end
end
engine = (!defined?(Syck) && defined?(Psych) ? 'psych' : 'syck')
module Syck
ENGINE = YAML::ENGINE
end