Fix that JSON parser fails to read escaped backslashes.

[#973 state:committed]

Signed-off-by: Jeremy Kemper <jeremy@bitsweat.net>

activesupport/lib/active_support/json/backends/yaml.rb

@@ -20,7 +20,7 @@ def decode(json)
         rescue ArgumentError => e
           raise ParseError, "Invalid JSON string"
         end
-    
+
         protected
           # Ensure that ":" and "," are always followed by a space
           def convert_json_to_yaml(json) #:nodoc:
@@ -42,6 +42,8 @@ def convert_json_to_yaml(json) #:nodoc:
                 end
               when ":",","
                 marks << scanner.pos - 1 unless quoting
+              when "\\"
+                scanner.skip(/\\/)
               end
             end
 
@@ -89,3 +91,4 @@ def convert_json_to_yaml(json) #:nodoc:
     end
   end
 end
+

activesupport/test/json/decoding_test.rb

@@ -14,10 +14,10 @@ class TestJSONDecoding < ActiveSupport::TestCase
     %({"a": "a's, b's and c's", "b": "5,000"})   => {"a" => "a's, b's and c's", "b" => "5,000"},
     # multibyte
     %({"matzue": "松江", "asakusa": "浅草"}) => {"matzue" => "松江", "asakusa" => "浅草"},
-    %({"a": "2007-01-01"})                       => {'a' => Date.new(2007, 1, 1)}, 
-    %({"a": "2007-01-01 01:12:34 Z"})            => {'a' => Time.utc(2007, 1, 1, 1, 12, 34)}, 
+    %({"a": "2007-01-01"})                       => {'a' => Date.new(2007, 1, 1)},
+    %({"a": "2007-01-01 01:12:34 Z"})            => {'a' => Time.utc(2007, 1, 1, 1, 12, 34)},
     # no time zone
-    %({"a": "2007-01-01 01:12:34"})              => {'a' => "2007-01-01 01:12:34"}, 
+    %({"a": "2007-01-01 01:12:34"})              => {'a' => "2007-01-01 01:12:34"},
     # needs to be *exact*
     %({"a": " 2007-01-01 01:12:34 Z "})          => {'a' => " 2007-01-01 01:12:34 Z "},
     %({"a": "2007-01-01 : it's your birthday"})  => {'a' => "2007-01-01 : it's your birthday"},
@@ -29,6 +29,7 @@ class TestJSONDecoding < ActiveSupport::TestCase
     %({"a": null})  => {"a" => nil},
     %({"a": true})  => {"a" => true},
     %({"a": false}) => {"a" => false},
+    %q({"bad":"\\\\","trailing":""}) => {"bad" => "\\", "trailing" => ""},
     %q({"a": "http:\/\/test.host\/posts\/1"}) => {"a" => "http://test.host/posts/1"},
     %q({"a": "\u003cunicode\u0020escape\u003e"}) => {"a" => "<unicode escape>"},
     %q({"a": "\\\\u0020skip double backslashes"}) => {"a" => "\\u0020skip double backslashes"},
@@ -83,3 +84,4 @@ def test_failed_json_decoding
     assert_raise(ActiveSupport::JSON::ParseError) { ActiveSupport::JSON.decode(%({: 1})) }
   end
 end
+