added tag v1_9_0_4

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/tags/v1_9_0_4@18845 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 33 insertions, 0 deletions

diff --git a/trunk/lib/yaml/encoding.rb b/trunk/lib/yaml/encoding.rb
new file mode 100644
index 0000000000..57dc553606
--- /dev/null
+++ b/trunk/lib/yaml/encoding.rb
@@ -0,0 +1,33 @@
+#
+# Handle Unicode-to-Internal conversion
+#
+
+module YAML
+
+	#
+	# Escape the string, condensing common escapes
+	#
+	def YAML.escape( value, skip = "" )
+		value.gsub( /\\/, "\\\\\\" ).
+              gsub( /"/, "\\\"" ).
+              gsub( /([\x00-\x1f])/ ) do
+                 skip[$&] || ESCAPES[ $&.unpack("C")[0] ]
+             end
+	end
+
+	#
+	# Unescape the condenses escapes
+	#
+	def YAML.unescape( value )
+		value.gsub( /\\(?:([nevfbart\\])|0?x([0-9a-fA-F]{2})|u([0-9a-fA-F]{4}))/ ) {
+			if $3
+				["#$3".hex ].pack('U*')
+			elsif $2
+				[$2].pack( "H2" ) 
+			else
+				UNESCAPES[$1] 
+			end
+		}
+	end
+
+end