[ruby-dev:42339] [Ruby 1.9-Bug#3909][Open] CGI.unescape("あ%E3%81%82")で例外

Bug #3909: CGI.unescape("あ%E3%81%82")で例外
http://redmine.ruby-lang.org/issues/show/3909

起票者: Takeyuki Fujioka
ステータス: Open, 優先度: Normal
担当者: Takeyuki Fujioka, Target version: 1.9.x
ruby -v: ruby 1.9.2p0 (2010-08-18 revision 29036) [x86_64-darwin10.4.0]

tDiaryの方で例外が起きるという報告がありました。

irb(main):004:0> CGI.unescape("あ%E3%81%82")
Encoding::CompatibilityError: incompatible character encodings: UTF-8
and ASCII-8BIT
        from /usr/local/ruby-trunk/lib/ruby/1.9.1/cgi/util.rb:17:in `gsub'
        from /usr/local/ruby-trunk/lib/ruby/1.9.1/cgi/util.rb:17:in
`unescape'
        from (irb):4
        from /usr/local/ruby-trunk/bin/irb-trunk:12:in `<main>'

かずひこさんによると、
--- cgi/util.rb.orig
+++ cgi/util.rb
@@ -15,8 +15,8 @@
   #      # => "'Stop!' said Fred"
   def CGI::unescape(string,encoding=@@accept_charset)
     str=string.tr('+', ' ').gsub(/((?:%[0-9a-fA-F]{2})+)/) do
-      [$1.delete('%')].pack('H*')
-    end.force_encoding(encoding)
+      [$1.delete('%')].pack('H*').force_encoding(encoding)
+    end
     str.valid_encoding? ? str : str.force_encoding(string.encoding)
   end

でなおるとのことです。


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