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authorJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-16 18:49:26 +0900
committerJari Vetoniemi <jari.vetoniemi@indooratlas.com>2020-03-30 00:39:06 +0900
commitfcbf63e62c627deae76c1b8cb8c0876c536ed811 (patch)
tree64cb17de3f41a2b6fef2368028fbd00349946994 /jni/ruby/lib/rubygems/syck_hack.rb
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+# :stopdoc:
+
+# Hack to handle syck's DefaultKey bug
+#
+# This file is always loaded AFTER either syck or psych are already
+# loaded. It then looks at what constants are available and creates
+# a consistent view on all rubys.
+#
+# All this is so that there is always a YAML::Syck::DefaultKey
+# class no matter if the full yaml library has loaded or not.
+#
+
+module YAML # :nodoc:
+ # In newer 1.9.2, there is a Syck toplevel constant instead of it
+ # being underneath YAML. If so, reference it back under YAML as
+ # well.
+ if defined? ::Syck
+ # for tests that change YAML::ENGINE
+ # 1.8 does not support the second argument to const_defined?
+ remove_const :Syck rescue nil
+
+ Syck = ::Syck
+
+ # JRuby's "Syck" is called "Yecht"
+ elsif defined? YAML::Yecht
+ Syck = YAML::Yecht
+
+ # Otherwise, if there is no YAML::Syck, then we've got just psych
+ # loaded, so lets define a stub for DefaultKey.
+ elsif !defined? YAML::Syck
+ module Syck
+ class DefaultKey # :nodoc:
+ end
+ end
+ end
+
+ # Now that we've got something that is always here, define #to_s
+ # so when code tries to use this, it at least just shows up like it
+ # should.
+ module Syck
+ class DefaultKey
+ remove_method :to_s rescue nil
+
+ def to_s
+ '='
+ end
+ end
+ end
+
+ SyntaxError = Error unless defined? SyntaxError
+end
+
+# Sometime in the 1.9 dev cycle, the Syck constant was moved from under YAML
+# to be a toplevel constant. So gemspecs created under these versions of Syck
+# will have references to Syck::DefaultKey.
+#
+# So we need to be sure that we reference Syck at the toplevel too so that
+# we can always load these kind of gemspecs.
+#
+if !defined?(Syck)
+ Syck = YAML::Syck
+end
+
+# Now that we've got Syck setup in all the right places, store
+# a reference to the DefaultKey class inside Gem. We do this so that
+# if later on YAML, etc are redefined, we've still got a consistent
+# place to find the DefaultKey class for comparison.
+
+module Gem
+ # for tests that change YAML::ENGINE
+ remove_const :SyckDefaultKey if const_defined? :SyckDefaultKey
+
+ SyckDefaultKey = YAML::Syck::DefaultKey
+end
+
+# :startdoc: