Remove dart:codec and move classes into dart:convert.

sdk/lib/convert/json.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of dart.convert;
 
+final JSON = new JsonCodec();
+
+/**
+ * A [JsonCodec] encodes JSON objects to strings and decodes strings to
+ * JSON objects.
+ */
+class JsonCodec extends Codec<Object, String> {
+  const JsonCodec();
+
+  /**
+   * Creates a `JsonCodec` with the given reviver.
+   *
+   * The [reviver] function is called once for each object or list property
+   * that has been parsed during decoding. The `key` argument is either the
+   * integer list index for a list property, the map string for object
+   * properties, or `null` for the final result.
+   */
+  factory JsonCodec.withReviver(reviver(var key, var value)) =
+      _ReviverJsonCodec;
+
+  /**
+   * Parses the string and returns the resulting Json object.
+   *
+   * The optional [reviver] function, if provided, is called once for each
+   * object or list property parsed.

[Søren Gjesse, 2013/07/22 12:04:42]

Repeat the documentation on the type of 'key' from the documentation for
JsonCodec.withReviver - or refer to it.

[floitsch, 2013/07/22 12:24:58]

Done.

+   */
+  Object decode(String str, {reviver(var key, var value)}) {
+    return new JsonDecoder(reviver).convert(str);
+  }
+
+  JsonEncoder get encoder => new JsonEncoder();
+  JsonDecoder get decoder => new JsonDecoder(null);
+}
+
+class _ReviverJsonCodec extends JsonCodec {
+  final Function _reviver;
+  _ReviverJsonCodec(this._reviver);
+
+  Object decode(String str, {reviver(var key, var value)}) {
+    if (reviver == null) reviver = _reviver;
+    return new JsonDecoder(reviver).convert(str);
+  }
+
+  JsonDecoder get decoder => new JsonDecoder(_reviver);
+}
+
 /**
  * A [JsonEncoder] converts JSON objects to strings.
  */
 class JsonEncoder extends Converter<Object, String> {
   JsonEncoder();
 
   /**
    * Converts the given object [o] to its JSON representation.
    *
    * Directly serializable values are [num], [String], [bool], and [Null], as
@@ skipping 48 matching lines @@
    * If `this` was initialized with a reviver, then the parsing operation
    * invokes the reviver on every object or list property that has been parsed.
    * The arguments are the property name ([String]) or list index ([int]), and
    * the value is the parsed value. The return value of the reviver is used as
    * the value of that property instead the parsed value.
    *
    * Throws [FormatException] if the input is not valid JSON text.
    */
   Object convert(String input) => OLD_JSON_LIB.parse(input, _reviver);
 }