* ext/psych/lib/psych/visitors/yaml_tree.rb: string subclasses should

not be considered to be binary.  Fixes Psych / GH 166
  https://github.com/tenderlove/psych/issues/166

* test/psych/test_string.rb: test for fix

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43469 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,11 @@
+Wed Oct 30 03:08:24 2013  Aaron Patterson <aaron@tenderlovemaking.com>
+
+	* ext/psych/lib/psych/visitors/yaml_tree.rb: string subclasses should
+	  not be considered to be binary.  Fixes Psych / GH 166
+	  https://github.com/tenderlove/psych/issues/166
+
+	* test/psych/test_string.rb: test for fix
+
 Tue Oct 29 23:01:18 2013  Masaki Matsushita  <glass.saga@gmail.com>
 
 	* array.c (rb_ary_zip): some refactoring.

ext/psych/lib/psych/visitors/yaml_tree.rb

@@ -267,8 +267,7 @@ module Psych
       def binary? string
         (string.encoding == Encoding::ASCII_8BIT && !string.ascii_only?) ||
           string.index("\x00") ||
-          string.count("\x00-\x7F", "^ -~\t\r\n").fdiv(string.length) > 0.3 ||
-          string.class != String
+          string.count("\x00-\x7F", "^ -~\t\r\n").fdiv(string.length) > 0.3
       end
       private :binary?
 
@@ -301,6 +300,8 @@ module Psych
         if ivars.empty?
           unless o.class == ::String
             tag = "!ruby/string:#{o.class}"
+            plain = false
+            quote = false
           end
           @emitter.scalar str, nil, tag, plain, quote, style
         else

test/psych/test_string.rb

@@ -20,6 +20,11 @@ module Psych
       assert_match(/---\s*"/, yaml)
     end
 
+    def test_cycle_x
+      str = X.new 'abc'
+      assert_cycle str
+    end
+
     def test_dash_dot
       assert_cycle '-.'
       assert_cycle '+.'