dart:convert library.

sdk/lib/codec/json.dart

Index: sdk/lib/codec/json.dart
diff --git a/sdk/lib/codec/json.dart b/sdk/lib/codec/json.dart
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index 0000000000000000000000000000000000000000..94ea12f987e9f605e21c397553389740173f4ae4
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+++ b/sdk/lib/codec/json.dart
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+// 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.codec;
+
+final JSON = new JsonCodec();
+
+class JsonCodec extends Codec<Object, String> {
+  const JsonCodec();
+  factory JsonCodec.withReviver(reviver(var key, var value)) =
+      _ReviverJsonCodec;
+
+  String encode(Object o) {
+    return encoder.convert(o);
+  }
+  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)}) {
+    reviver = reviver == null ? _reviver : reviver;
+    return new JsonDecoder(reviver).convert(str);
+  }
+
+  JsonDecoder get decoder => new JsonDecoder(_reviver);
+}