Extract json string escaping

activesupport/lib/active_support/json.rb

@@ -11,6 +11,33 @@ module ActiveSupport
     # 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})?))$/
 
+    module Encoding #:nodoc:
+      mattr_accessor :escape_regex
+
+      ESCAPED_CHARS = {
+        "\010" =>  '\b',
+        "\f"   =>  '\f',
+        "\n"   =>  '\n',
+        "\r"   =>  '\r',
+        "\t"   =>  '\t',
+        '"'    =>  '\"',
+        '\\'   =>  '\\\\',
+        '>'    =>  '\u003E',
+        '<'    =>  '\u003C',
+        '&'    =>  '\u0026'
+      }
+
+      def self.escape(string)
+        json = '"' + string.gsub(escape_regex) { |s| ESCAPED_CHARS[s] }
+        json.force_encoding('ascii-8bit') if respond_to?(:force_encoding)
+        json.gsub(/([\xC0-\xDF][\x80-\xBF]|
+                 [\xE0-\xEF][\x80-\xBF]{2}|
+                 [\xF0-\xF7][\x80-\xBF]{3})+/nx) { |s|
+          s.unpack("U*").pack("n*").unpack("H*")[0].gsub(/.{4}/, '\\\\u\&')
+        } + '"'
+      end
+    end
+
     class << self
       attr_reader :backend
       delegate :decode, :to => :backend
@@ -34,9 +61,7 @@ module ActiveSupport
   end
 
   class << self
-    def escape_html_entities_in_json
-      @escape_html_entities_in_json
-    end
+    attr_reader :escape_html_entities_in_json
 
     def escape_html_entities_in_json=(value)
       ActiveSupport::JSON::Encoding.escape_regex = \
@@ -48,8 +73,9 @@ module ActiveSupport
       @escape_html_entities_in_json = value
     end
   end
-
-  JSON.backend = 'Yaml'
 end
 
-require 'active_support/json/encoding'
+ActiveSupport.escape_html_entities_in_json = true
+ActiveSupport::JSON.backend = 'Yaml'
+
+require 'active_support/json/encoding'

activesupport/lib/active_support/json/encoders/string.rb

@@ -1,36 +1,5 @@
-module ActiveSupport
-  module JSON
-    module Encoding
-      mattr_accessor :escape_regex
-
-      ESCAPED_CHARS = {
-        "\010" =>  '\b',
-        "\f"   =>  '\f',
-        "\n"   =>  '\n',
-        "\r"   =>  '\r',
-        "\t"   =>  '\t',
-        '"'    =>  '\"',
-        '\\'   =>  '\\\\',
-        '>'    =>  '\u003E',
-        '<'    =>  '\u003C',
-        '&'    =>  '\u0026'
-      }
-    end
-  end
-end
-
-ActiveSupport.escape_html_entities_in_json = true
-
 class String
   def rails_to_json(options = nil) #:nodoc:
-    json = '"' + gsub(ActiveSupport::JSON::Encoding.escape_regex) { |s|
-      ActiveSupport::JSON::Encoding::ESCAPED_CHARS[s]
-    }
-    json.force_encoding('ascii-8bit') if respond_to?(:force_encoding)
-    json.gsub(/([\xC0-\xDF][\x80-\xBF]|
-             [\xE0-\xEF][\x80-\xBF]{2}|
-             [\xF0-\xF7][\x80-\xBF]{3})+/nx) { |s|
-      s.unpack("U*").pack("n*").unpack("H*")[0].gsub(/.{4}/, '\\\\u\&')
-    } + '"'
+    ActiveSupport::JSON::Encoding.escape(self)
   end
 end