* Add pluggable JSON backends with support for the JSON gem. [rick]

    Example: ActiveSupport::JSON.backend = "JSONGem"

  All internal Rails JSON encoding is now handled by ActiveSupport::JSON.encode().  Use of #to_json is not recommended, as it may clash with other libraries that overwrite it.  However, you can recover Rails specific functionality
  if you really want to use #to_json.

    gem 'json'
    ActiveSupport::JSON.backend = "JSONGem"

    class ActiveRecord::Base
      alias to_json rails_to_json
    end

24 files changed, 285 insertions, 149 deletions

diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index cd7b47d780..ca5ab13a46 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,20 @@
 *Edge*
 
+* Add ActiveSupport.parse_json_times to disable time parsing in JSON backends that don't support it or don't need it. [rick]
+
+* Add pluggable JSON backends with support for the JSON gem. [rick]
+    Example: ActiveSupport::JSON.backend = "JSONGem"
+
+ All internal Rails JSON encoding is now handled by ActiveSupport::JSON.encode().  Use of #to_json is not recommended, as it may clash with other libraries that overwrite it.  However, you can recover Rails specific functionality
+ if you really want to use #to_json.
+
+    gem 'json'
+    ActiveSupport::JSON.backend = "JSONGem"
+
+    class ActiveRecord::Base
+      alias to_json rails_to_json
+    end
+
 * require 'active_support' no longer orders the whole menu of core extensions. Ask for just what you need: e.g. require 'active_support/core/time' to use timezones, durations, and stdlib date/time extensions. [Jeremy Kemper]
 
 * Removed rarely-used DRb cache store.  [Jeremy Kemper]
diff --git a/activesupport/lib/active_support/json.rb b/activesupport/lib/active_support/json.rb
index 91f19f8a70..fc433de582 100644
--- a/activesupport/lib/active_support/json.rb
+++ b/activesupport/lib/active_support/json.rb
@@ -1,8 +1,37 @@
+require 'active_support/core_ext/module/delegation'
 require 'active_support/core_ext/module/attribute_accessors'
 
 module ActiveSupport
   # If true, use ISO 8601 format for dates and times. Otherwise, fall back to the Active Support legacy format.
   mattr_accessor :use_standard_json_time_format
+  # Look for and parse json strings that look like ISO 8601 times.
+  mattr_accessor :parse_json_times
+
+  module JSON
+    # matches YAML-formatted dates
+    DATE_REGEX = /^(?:\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?))$/
+
+    class << self
+      attr_reader :backend
+      delegate :decode, :to => :backend
+    
+      def backend=(name)
+        if name.is_a?(Module)
+          @backend = name
+        else
+          require "active_support/json/backends/#{name.to_s.downcase}.rb"
+          @backend = ActiveSupport::JSON::Backends::const_get(name)
+        end
+      end
+    
+      def with_backend(name)
+        old_backend, self.backend = backend, name
+        yield
+      ensure
+        self.backend = old_backend
+      end
+    end
+  end
 
   class << self
     def escape_html_entities_in_json
@@ -19,7 +48,8 @@ module ActiveSupport
       @escape_html_entities_in_json = value
     end
   end
+
+  JSON.backend = 'Yaml'
 end
 
-require 'active_support/json/encoding'
-require 'active_support/json/decoding'
+require 'active_support/json/encoding'
\ No newline at end of file
diff --git a/activesupport/lib/active_support/json/backends/jsongem.rb b/activesupport/lib/active_support/json/backends/jsongem.rb
new file mode 100644
index 0000000000..de847e30a3
--- /dev/null
+++ b/activesupport/lib/active_support/json/backends/jsongem.rb
@@ -0,0 +1,36 @@
+module ActiveSupport
+  module JSON
+    ParseError = ::JSON::ParserError
+
+    module Backends
+      module JSONGem
+        extend self
+
+        # Converts a JSON string into a Ruby object.
+        def decode(json)
+          data = ::JSON.parse(json)
+          if ActiveSupport.parse_json_times
+            convert_dates_from(data)
+          else
+            data
+          end
+        end
+
+      private
+        def convert_dates_from(data)
+          case data
+            when DATE_REGEX
+              DateTime.parse(data)
+            when Array
+              data.map! { |d| convert_dates_from(d) }
+            when Hash
+              data.each do |key, value|
+                data[key] = convert_dates_from(value)
+              end
+            else data
+          end
+        end
+      end
+    end
+  end
+end
\ No newline at end of file
diff --git a/activesupport/lib/active_support/json/backends/yaml.rb b/activesupport/lib/active_support/json/backends/yaml.rb
new file mode 100644
index 0000000000..c7db508c23
--- /dev/null
+++ b/activesupport/lib/active_support/json/backends/yaml.rb
@@ -0,0 +1,83 @@
+require 'active_support/core_ext/string/starts_ends_with'
+
+module ActiveSupport
+  module JSON
+    class ParseError < StandardError
+    end
+
+    module Backends
+      module Yaml
+        extend self
+
+        # Converts a JSON string into a Ruby object.
+        def decode(json)
+          YAML.load(convert_json_to_yaml(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:
+            require 'strscan' unless defined? ::StringScanner
+            scanner, quoting, marks, pos, times = ::StringScanner.new(json), false, [], nil, []
+            while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
+              case char = scanner[1]
+              when '"', "'"
+                if !quoting
+                  quoting = char
+                  pos = scanner.pos
+                elsif quoting == char
+                  if json[pos..scanner.pos-2] =~ DATE_REGEX
+                    # found a date, track the exact positions of the quotes so we can remove them later.
+                    # oh, and increment them for each current mark, each one is an extra padded space that bumps
+                    # the position in the final YAML output
+                    total_marks = marks.size
+                    times << pos+total_marks << scanner.pos+total_marks
+                  end
+                  quoting = false
+                end
+              when ":",","
+                marks << scanner.pos - 1 unless quoting
+              end
+            end
+
+            if marks.empty?
+              json.gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
+                ustr = $1
+                if ustr.start_with?('u')
+                  [ustr[1..-1].to_i(16)].pack("U")
+                elsif ustr == '\\'
+                  '\\\\'
+                else
+                  ustr
+                end
+              end
+            else
+              left_pos  = [-1].push(*marks)
+              right_pos = marks << scanner.pos + scanner.rest_size
+              output    = []
+              left_pos.each_with_index do |left, i|
+                scanner.pos = left.succ
+                output << scanner.peek(right_pos[i] - scanner.pos + 1).gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
+                  ustr = $1
+                  if ustr.start_with?('u')
+                    [ustr[1..-1].to_i(16)].pack("U")
+                  elsif ustr == '\\'
+                    '\\\\'
+                  else
+                    ustr
+                  end
+                end
+              end
+              output = output * " "
+
+              times.each { |i| output[i-1] = ' ' }
+              output.gsub!(/\\\//, '/')
+              output
+            end
+          end
+      end
+    end
+  end
+end
diff --git a/activesupport/lib/active_support/json/decoding.rb b/activesupport/lib/active_support/json/decoding.rb
deleted file mode 100644
index 70e9f40fc7..0000000000
--- a/activesupport/lib/active_support/json/decoding.rb
+++ /dev/null
@@ -1,82 +0,0 @@
-require 'active_support/core_ext/string/starts_ends_with'
-
-module ActiveSupport
-  module JSON
-    class ParseError < StandardError
-    end
-    
-    class << self
-      # Converts a JSON string into a Ruby object.
-      def decode(json)
-        YAML.load(convert_json_to_yaml(json))
-      rescue ArgumentError => e
-        raise ParseError, "Invalid JSON string"
-      end
-      
-      protected
-        # matches YAML-formatted dates
-        DATE_REGEX = /^(?:\d{4}-\d{2}-\d{2}|\d{4}-\d{1,2}-\d{1,2}[ \t]+\d{1,2}:\d{2}:\d{2}(\.[0-9]*)?(([ \t]*)Z|[-+]\d{2}?(:\d{2})?)?)$/
-
-        # Ensure that ":" and "," are always followed by a space
-        def convert_json_to_yaml(json) #:nodoc:
-          require 'strscan' unless defined? ::StringScanner
-          scanner, quoting, marks, pos, times = ::StringScanner.new(json), false, [], nil, []
-          while scanner.scan_until(/(\\['"]|['":,\\]|\\.)/)
-            case char = scanner[1]
-            when '"', "'"
-              if !quoting
-                quoting = char
-                pos = scanner.pos
-              elsif quoting == char
-                if json[pos..scanner.pos-2] =~ DATE_REGEX
-                  # found a date, track the exact positions of the quotes so we can remove them later.
-                  # oh, and increment them for each current mark, each one is an extra padded space that bumps
-                  # the position in the final YAML output
-                  total_marks = marks.size
-                  times << pos+total_marks << scanner.pos+total_marks
-                end
-                quoting = false
-              end
-            when ":",","
-              marks << scanner.pos - 1 unless quoting
-            end
-          end
-
-          if marks.empty?
-            json.gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
-              ustr = $1
-              if ustr.start_with?('u')
-                [ustr[1..-1].to_i(16)].pack("U")
-              elsif ustr == '\\'
-                '\\\\'
-              else
-                ustr
-              end
-            end
-          else
-            left_pos  = [-1].push(*marks)
-            right_pos = marks << scanner.pos + scanner.rest_size
-            output    = []
-            left_pos.each_with_index do |left, i|
-              scanner.pos = left.succ
-              output << scanner.peek(right_pos[i] - scanner.pos + 1).gsub(/\\([\\\/]|u[[:xdigit:]]{4})/) do
-                ustr = $1
-                if ustr.start_with?('u')
-                  [ustr[1..-1].to_i(16)].pack("U")
-                elsif ustr == '\\'
-                  '\\\\'
-                else
-                  ustr
-                end
-              end
-            end
-            output = output * " "
-            
-            times.each { |i| output[i-1] = ' ' }
-            output.gsub!(/\\\//, '/')
-            output
-          end
-        end
-    end
-  end
-end
diff --git a/activesupport/lib/active_support/json/encoders/date.rb b/activesupport/lib/active_support/json/encoders/date.rb
index cc84de1388..79c3957362 100644
--- a/activesupport/lib/active_support/json/encoders/date.rb
+++ b/activesupport/lib/active_support/json/encoders/date.rb
@@ -11,11 +11,13 @@ class Date
   #   # With ActiveSupport.use_standard_json_time_format = false
   #   Date.new(2005,2,1).to_json
   #   # => "2005/02/01"
-  def to_json(options = nil)
+  def rails_to_json(options = nil)
     if ActiveSupport.use_standard_json_time_format
       %("#{strftime("%Y-%m-%d")}")
     else
       %("#{strftime("%Y/%m/%d")}")
     end
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/date_time.rb b/activesupport/lib/active_support/json/encoders/date_time.rb
index 6c85824105..cdfc39b9f3 100644
--- a/activesupport/lib/active_support/json/encoders/date_time.rb
+++ b/activesupport/lib/active_support/json/encoders/date_time.rb
@@ -11,11 +11,13 @@ class DateTime
   #   # With ActiveSupport.use_standard_json_time_format = false
   #   DateTime.civil(2005,2,1,15,15,10).to_json
   #   # => "2005/02/01 15:15:10 +0000"
-  def to_json(options = nil)
+  def rails_to_json(options = nil)
     if ActiveSupport.use_standard_json_time_format
       xmlschema.inspect
     else
       strftime('"%Y/%m/%d %H:%M:%S %z"')
     end
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/enumerable.rb b/activesupport/lib/active_support/json/encoders/enumerable.rb
index 881b1d62c1..e1c3ec249d 100644
--- a/activesupport/lib/active_support/json/encoders/enumerable.rb
+++ b/activesupport/lib/active_support/json/encoders/enumerable.rb
@@ -6,7 +6,9 @@ module Enumerable
   #   # => users.to_json(:only => :name)
   #
   # will pass the <tt>:only => :name</tt> option to each user.
-  def to_json(options = {}) #:nodoc:
-    "[#{map { |value| ActiveSupport::JSON.encode(value, options) } * ', '}]"
+  def rails_to_json(options = {}) #:nodoc:
+    "[#{map { |value| ActiveSupport::JSON.encode(value, options) } * ','}]"
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/false_class.rb b/activesupport/lib/active_support/json/encoders/false_class.rb
index bf0844334b..a7657cca37 100644
--- a/activesupport/lib/active_support/json/encoders/false_class.rb
+++ b/activesupport/lib/active_support/json/encoders/false_class.rb
@@ -1,5 +1,7 @@
 class FalseClass
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     'false'
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/hash.rb b/activesupport/lib/active_support/json/encoders/hash.rb
index d87b880743..19b97d7b8c 100644
--- a/activesupport/lib/active_support/json/encoders/hash.rb
+++ b/activesupport/lib/active_support/json/encoders/hash.rb
@@ -30,7 +30,7 @@ class Hash
   # would pass the <tt>:include => :posts</tt> option to <tt>users</tt>,
   # allowing the posts association in the User model to be converted to JSON
   # as well.
-  def to_json(options = {}) #:nodoc:
+  def rails_to_json(options = {}) #:nodoc:
     hash_keys = self.keys
 
     if except = options[:except]
@@ -41,8 +41,10 @@ class Hash
 
     result = '{'
     result << hash_keys.map do |key|
-      "#{ActiveSupport::JSON.encode(key.to_s)}: #{ActiveSupport::JSON.encode(self[key], options)}"
-    end * ', '
+      "#{ActiveSupport::JSON.encode(key.to_s)}:#{ActiveSupport::JSON.encode(self[key], options)}"
+    end * ','
     result << '}'
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/nil_class.rb b/activesupport/lib/active_support/json/encoders/nil_class.rb
index 4763471ac4..b31e1dd249 100644
--- a/activesupport/lib/active_support/json/encoders/nil_class.rb
+++ b/activesupport/lib/active_support/json/encoders/nil_class.rb
@@ -1,5 +1,7 @@
 class NilClass
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     'null'
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/numeric.rb b/activesupport/lib/active_support/json/encoders/numeric.rb
index 38713fb369..491b330c39 100644
--- a/activesupport/lib/active_support/json/encoders/numeric.rb
+++ b/activesupport/lib/active_support/json/encoders/numeric.rb
@@ -1,5 +1,7 @@
 class Numeric
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     to_s
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/object.rb b/activesupport/lib/active_support/json/encoders/object.rb
index 0475967aee..d68f50562e 100644
--- a/activesupport/lib/active_support/json/encoders/object.rb
+++ b/activesupport/lib/active_support/json/encoders/object.rb
@@ -2,7 +2,9 @@ require 'active_support/core_ext/object/instance_variables'
 
 class Object
   # Dumps object in JSON (JavaScript Object Notation). See www.json.org for more info.
-  def to_json(options = {})
+  def rails_to_json(options = {})
     ActiveSupport::JSON.encode(instance_values, options)
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/regexp.rb b/activesupport/lib/active_support/json/encoders/regexp.rb
index b6116b70b5..63ccd7c490 100644
--- a/activesupport/lib/active_support/json/encoders/regexp.rb
+++ b/activesupport/lib/active_support/json/encoders/regexp.rb
@@ -1,5 +1,7 @@
 class Regexp
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     inspect
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/string.rb b/activesupport/lib/active_support/json/encoders/string.rb
index 5ef797955a..27bef3b9cc 100644
--- a/activesupport/lib/active_support/json/encoders/string.rb
+++ b/activesupport/lib/active_support/json/encoders/string.rb
@@ -22,7 +22,7 @@ end
 ActiveSupport.escape_html_entities_in_json = true
 
 class String
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     json = '"' + gsub(ActiveSupport::JSON::Encoding.escape_regex) { |s|
       ActiveSupport::JSON::Encoding::ESCAPED_CHARS[s]
     }
@@ -33,4 +33,6 @@ class String
       s.unpack("U*").pack("n*").unpack("H*")[0].gsub(/.{4}/, '\\\\u\&')
     } + '"'
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/symbol.rb b/activesupport/lib/active_support/json/encoders/symbol.rb
index 485112f97c..6487bf8cb7 100644
--- a/activesupport/lib/active_support/json/encoders/symbol.rb
+++ b/activesupport/lib/active_support/json/encoders/symbol.rb
@@ -1,5 +1,7 @@
 class Symbol
-  def to_json(options = {}) #:nodoc:
+  def rails_to_json(options = {}) #:nodoc:
     ActiveSupport::JSON.encode(to_s, options)
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/time.rb b/activesupport/lib/active_support/json/encoders/time.rb
index 7d97c38d77..2699672949 100644
--- a/activesupport/lib/active_support/json/encoders/time.rb
+++ b/activesupport/lib/active_support/json/encoders/time.rb
@@ -13,11 +13,13 @@ class Time
   #   # With ActiveSupport.use_standard_json_time_format = false
   #   Time.utc(2005,2,1,15,15,10).to_json
   #   # => "2005/02/01 15:15:10 +0000"
-  def to_json(options = nil)
+  def rails_to_json(options = nil)
     if ActiveSupport.use_standard_json_time_format
       xmlschema.inspect
     else
       %("#{strftime("%Y/%m/%d %H:%M:%S")} #{formatted_offset(false)}")
     end
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoders/true_class.rb b/activesupport/lib/active_support/json/encoders/true_class.rb
index 037d812b3f..ac7c7d1e87 100644
--- a/activesupport/lib/active_support/json/encoders/true_class.rb
+++ b/activesupport/lib/active_support/json/encoders/true_class.rb
@@ -1,5 +1,7 @@
 class TrueClass
-  def to_json(options = nil) #:nodoc:
+  def rails_to_json(options = nil) #:nodoc:
     'true'
   end
+
+  alias to_json rails_to_json
 end
diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb
index aaaa3cdfd2..42a217cedc 100644
--- a/activesupport/lib/active_support/json/encoding.rb
+++ b/activesupport/lib/active_support/json/encoding.rb
@@ -8,7 +8,7 @@ module ActiveSupport
       seen = (options[:seen] ||= [])
       raise CircularReferenceError, 'object references itself' if seen.include?(value)
       seen << value
-      value.send(:to_json, options)
+      value.send(:rails_to_json, options)
     ensure
       seen.pop
     end
diff --git a/activesupport/lib/active_support/json/variable.rb b/activesupport/lib/active_support/json/variable.rb
index 7fd23b0a9e..3ee152ee3c 100644
--- a/activesupport/lib/active_support/json/variable.rb
+++ b/activesupport/lib/active_support/json/variable.rb
@@ -2,7 +2,7 @@ module ActiveSupport
   module JSON
     # A string that returns itself as its JSON-encoded form.
     class Variable < String
-      def to_json(options=nil)
+      def rails_to_json(options=nil)
         self
       end
     end
diff --git a/activesupport/lib/active_support/time_with_zone.rb b/activesupport/lib/active_support/time_with_zone.rb
index 0d4c75d272..1949ce0ad3 100644
--- a/activesupport/lib/active_support/time_with_zone.rb
+++ b/activesupport/lib/active_support/time_with_zone.rb
@@ -130,7 +130,7 @@ module ActiveSupport
     #   # With ActiveSupport.use_standard_json_time_format = false
     #   Time.utc(2005,2,1,15,15,10).in_time_zone.to_json
     #   # => "2005/02/01 15:15:10 +0000"
-    def to_json(options = nil)
+    def rails_to_json(options = nil)
       if !ActiveSupport.respond_to?(:use_standard_json_time_format) || ActiveSupport.use_standard_json_time_format
         xmlschema.inspect
       else
@@ -138,6 +138,8 @@ module ActiveSupport
       end
     end
 
+    alias to_json rails_to_json
+
     def to_yaml(options = {})
       if options.kind_of?(YAML::Emitter)
         utc.to_yaml(options)
diff --git a/activesupport/test/core_ext/time_with_zone_test.rb b/activesupport/test/core_ext/time_with_zone_test.rb
index 612a50c225..0380c28c17 100644
--- a/activesupport/test/core_ext/time_with_zone_test.rb
+++ b/activesupport/test/core_ext/time_with_zone_test.rb
@@ -57,12 +57,12 @@ class TimeWithZoneTest < Test::Unit::TestCase
   end
 
   def test_to_json
-    assert_equal "\"1999/12/31 19:00:00 -0500\"", @twz.to_json
+    assert_equal "\"1999/12/31 19:00:00 -0500\"", ActiveSupport::JSON.encode(@twz)
   end
 
   def test_to_json_with_use_standard_json_time_format_config_set_to_true
     old, ActiveSupport.use_standard_json_time_format = ActiveSupport.use_standard_json_time_format, true
-    assert_equal "\"1999-12-31T19:00:00-05:00\"", @twz.to_json
+    assert_equal "\"1999-12-31T19:00:00-05:00\"", ActiveSupport::JSON.encode(@twz)
   ensure
     ActiveSupport.use_standard_json_time_format = old
   end
diff --git a/activesupport/test/json/decoding_test.rb b/activesupport/test/json/decoding_test.rb
index 9b4b207c88..7e1bfcca84 100644
--- a/activesupport/test/json/decoding_test.rb
+++ b/activesupport/test/json/decoding_test.rb
@@ -1,49 +1,75 @@
 # encoding: UTF-8
 require 'abstract_unit'
 require 'active_support/json'
+require 'active_support/core_ext/kernel/reporting'
 
 class TestJSONDecoding < ActiveSupport::TestCase
   TESTS = {
     %q({"returnTo":{"\/categories":"\/"}})        => {"returnTo" => {"/categories" => "/"}},
-    %q({returnTo:{"\/categories":"\/"}})          => {"returnTo" => {"/categories" => "/"}},
     %q({"return\\"To\\":":{"\/categories":"\/"}}) => {"return\"To\":" => {"/categories" => "/"}},
     %q({"returnTo":{"\/categories":1}})          => {"returnTo" => {"/categories" => 1}},
     %({"returnTo":[1,"a"]})                    => {"returnTo" => [1, "a"]},
     %({"returnTo":[1,"\\"a\\",", "b"]})        => {"returnTo" => [1, "\"a\",", "b"]},
-    %({a: "'", "b": "5,000"})                  => {"a" => "'", "b" => "5,000"},
-    %({a: "a's, b's and c's", "b": "5,000"})   => {"a" => "a's, b's and c's", "b" => "5,000"},
+    %({"a": "'", "b": "5,000"})                  => {"a" => "'", "b" => "5,000"},
+    %({"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"},
+    %({"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"},
     %([])    => [],
     %({})    => {},
-    %(1)     => 1,
-    %("")    => "",
-    %("\\"") => "\"",
-    %(null)  => nil,
-    %(true)  => true,
-    %(false) => false,
-    %q("http:\/\/test.host\/posts\/1") => "http://test.host/posts/1",
-    %q("\u003cunicode\u0020escape\u003e") => "<unicode escape>",
-    %q("\\\\u0020skip double backslashes") => "\\u0020skip double backslashes",
-    %q({a: "\u003cbr /\u003e"}) => {'a' => "<br />"},
-    %q({b:["\u003ci\u003e","\u003cb\u003e","\u003cu\u003e"]}) => {'b' => ["<i>","<b>","<u>"]}
+    %({"a":1})     => {"a" => 1},
+    %({"a": ""})    => {"a" => ""},
+    %({"a":"\\""}) => {"a" => "\""},
+    %({"a": null})  => {"a" => nil},
+    %({"a": true})  => {"a" => true},
+    %({"a": false}) => {"a" => false},
+    %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"},
+    %q({"a": "\u003cbr /\u003e"}) => {'a' => "<br />"},
+    %q({"b":["\u003ci\u003e","\u003cb\u003e","\u003cu\u003e"]}) => {'b' => ["<i>","<b>","<u>"]}
   }
-  
-  TESTS.each do |json, expected|
-    test "json decodes #{json}" do
-      assert_nothing_raised do
-        assert_equal expected, ActiveSupport::JSON.decode(json)
+
+  backends = %w(Yaml)
+  begin
+    gem 'json', '>= 1.1'
+    require 'json'
+    backends << "JSONGem"
+  rescue Gem::LoadError
+    # Skip JSON gem tests
+  end
+
+  backends.each do |backend|
+    TESTS.each do |json, expected|
+      test "json decodes #{json} with the #{backend} backend" do
+        ActiveSupport.parse_json_times = true
+        silence_warnings do
+          ActiveSupport::JSON.with_backend backend do
+            assert_nothing_raised do
+              assert_equal expected, ActiveSupport::JSON.decode(json)
+            end
+          end
+        end
+      end
+    end
+  end
+
+  if backends.include?("JSONGem")
+    test "json decodes time json with time parsing disabled" do
+      ActiveSupport.parse_json_times = false
+      expected = {"a" => "2007-01-01 01:12:34 Z"}
+      ActiveSupport::JSON.with_backend "JSONGem" do
+        assert_equal expected, ActiveSupport::JSON.decode(%({"a": "2007-01-01 01:12:34 Z"}))
       end
     end
   end
-  
+
   def test_failed_json_decoding
     assert_raise(ActiveSupport::JSON::ParseError) { ActiveSupport::JSON.decode(%({: 1})) }
   end
diff --git a/activesupport/test/json/encoding_test.rb b/activesupport/test/json/encoding_test.rb
index 9e6b4fa501..db24b3d96a 100644
--- a/activesupport/test/json/encoding_test.rb
+++ b/activesupport/test/json/encoding_test.rb
@@ -19,14 +19,14 @@ class TestJSONEncoding < Test::Unit::TestCase
                    [ 'a "string" with quotes & an ampersand', %("a \\"string\\" with quotes \\u0026 an ampersand") ],
                    [ 'http://test.host/posts/1', %("http://test.host/posts/1")]]
 
-  ArrayTests    = [[ ['a', 'b', 'c'],          %([\"a\", \"b\", \"c\"])          ],
-                   [ [1, 'a', :b, nil, false], %([1, \"a\", \"b\", null, false]) ]]
+  ArrayTests    = [[ ['a', 'b', 'c'],          %([\"a\",\"b\",\"c\"])          ],
+                   [ [1, 'a', :b, nil, false], %([1,\"a\",\"b\",null,false]) ]]
 
   SymbolTests   = [[ :a,     %("a")    ],
                    [ :this,  %("this") ],
                    [ :"a b", %("a b")  ]]
 
-  ObjectTests   = [[ Foo.new(1, 2), %({\"a\": 1, \"b\": 2}) ]]
+  ObjectTests   = [[ Foo.new(1, 2), %({\"a\":1,\"b\":2}) ]]
 
   VariableTests = [[ ActiveSupport::JSON::Variable.new('foo'), 'foo'],
                    [ ActiveSupport::JSON::Variable.new('alert("foo")'), 'alert("foo")']]
@@ -47,7 +47,7 @@ class TestJSONEncoding < Test::Unit::TestCase
         ActiveSupport.escape_html_entities_in_json  = class_tests !~ /^Standard/
         ActiveSupport.use_standard_json_time_format = class_tests =~ /^Standard/
         self.class.const_get(class_tests).each do |pair|
-          assert_equal pair.last, pair.first.to_json
+          assert_equal pair.last, ActiveSupport::JSON.encode(pair.first)
         end
       ensure
         ActiveSupport.escape_html_entities_in_json  = false
@@ -57,45 +57,45 @@ class TestJSONEncoding < Test::Unit::TestCase
   end
 
   def test_hash_encoding
-    assert_equal %({\"a\": \"b\"}), { :a => :b }.to_json
-    assert_equal %({\"a\": 1}), { 'a' => 1  }.to_json
-    assert_equal %({\"a\": [1, 2]}), { 'a' => [1,2] }.to_json
-    assert_equal %({"1": 2}), { 1 => 2 }.to_json
+    assert_equal %({\"a\":\"b\"}), ActiveSupport::JSON.encode(:a => :b)
+    assert_equal %({\"a\":1}), ActiveSupport::JSON.encode('a' => 1)
+    assert_equal %({\"a\":[1,2]}), ActiveSupport::JSON.encode('a' => [1,2])
+    assert_equal %({"1":2}), ActiveSupport::JSON.encode(1 => 2)
 
-    sorted_json = '{' + {:a => :b, :c => :d}.to_json[1..-2].split(', ').sort.join(', ') + '}'
-    assert_equal %({\"a\": \"b\", \"c\": \"d\"}), sorted_json
+    sorted_json = '{' + ActiveSupport::JSON.encode(:a => :b, :c => :d)[1..-2].split(',').sort.join(',') + '}'
+    assert_equal %({\"a\":\"b\",\"c\":\"d\"}), sorted_json
   end
 
   def test_utf8_string_encoded_properly_when_kcode_is_utf8
     with_kcode 'UTF8' do
-      assert_equal '"\\u20ac2.99"', '€2.99'.to_json
-      assert_equal '"\\u270e\\u263a"', '✎☺'.to_json
+      assert_equal '"\\u20ac2.99"', ActiveSupport::JSON.encode('€2.99')
+      assert_equal '"\\u270e\\u263a"', ActiveSupport::JSON.encode('✎☺')
     end
   end
 
   def test_exception_raised_when_encoding_circular_reference
     a = [1]
     a << a
-    assert_raise(ActiveSupport::JSON::CircularReferenceError) { a.to_json }
+    assert_raise(ActiveSupport::JSON::CircularReferenceError) { ActiveSupport::JSON.encode(a) }
   end
 
   def test_hash_key_identifiers_are_always_quoted
     values = {0 => 0, 1 => 1, :_ => :_, "$" => "$", "a" => "a", :A => :A, :A0 => :A0, "A0B" => "A0B"}
-    assert_equal %w( "$" "A" "A0" "A0B" "_" "a" "0" "1" ).sort, object_keys(values.to_json)
+    assert_equal %w( "$" "A" "A0" "A0B" "_" "a" "0" "1" ).sort, object_keys(ActiveSupport::JSON.encode(values))
   end
 
   def test_hash_should_allow_key_filtering_with_only
-    assert_equal %({"a": 1}), { 'a' => 1, :b => 2, :c => 3 }.to_json(:only => 'a')
+    assert_equal %({"a":1}), ActiveSupport::JSON.encode({'a' => 1, :b => 2, :c => 3}, :only => 'a')
   end
 
   def test_hash_should_allow_key_filtering_with_except
-    assert_equal %({"b": 2}), { 'foo' => 'bar', :b => 2, :c => 3 }.to_json(:except => ['foo', :c])
+    assert_equal %({"b":2}), ActiveSupport::JSON.encode({'foo' => 'bar', :b => 2, :c => 3}, :except => ['foo', :c])
   end
   
   def test_time_to_json_includes_local_offset
     ActiveSupport.use_standard_json_time_format = true
     with_env_tz 'US/Eastern' do
-      assert_equal %("2005-02-01T15:15:10-05:00"), Time.local(2005,2,1,15,15,10).to_json
+      assert_equal %("2005-02-01T15:15:10-05:00"), ActiveSupport::JSON.encode(Time.local(2005,2,1,15,15,10))
     end
   ensure
     ActiveSupport.use_standard_json_time_format = false
@@ -109,7 +109,7 @@ class TestJSONEncoding < Test::Unit::TestCase
           :latitude => 123.234
         }
       }
-      result = hash.to_json
+      result = ActiveSupport::JSON.encode(hash)
     end
   end
 
@@ -134,6 +134,6 @@ class JsonOptionsTests < Test::Unit::TestCase
     ActiveSupport::JSON.expects(:encode).with(2, json_options)
     ActiveSupport::JSON.expects(:encode).with('foo', json_options)
 
-    [1, 2, 'foo'].to_json(json_options)
+    [1, 2, 'foo'].rails_to_json(json_options)
   end
 end