Add @jsify annotation. Support automatically proxying Lists and Maps to Dart in Proxies. Support co…

lib/src/js_object_map.dart

+// Copyright (c) 2014, 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.
+
+library js.js_object_map;
+
+import 'dart:collection' show Maps, MapMixin;
+import 'dart:js';
+
+import 'package:js/src/js_impl.dart';
+
+/**
+ * A [Map] interface wrapper for [JsObject]s.
+ *
+ * Keys must be [String] because they are used as JavaScript properties names.
+ *
+ * Values returned from this map are automatically converted to JavaScript with
+ * the [toJs] function when added, and to Dart with the [toDart] funtion when
+ * accessed.
+ */
+class JsObjectMap<V> extends MapMixin<String, V> {
+  static final _obj = context['Object'];
+
+  final JsObject _o;
+
+  JsObjectMap.fromJsObject(JsObject o) : _o = o;
+
+  @override
+  V operator [](String key) => toDart(_o[key]) as V;
+
+  @override
+  void operator []=(String key, V value) {
+    if (key == '__proto__') {
+      throw new ArgumentError("'__proto__' is disallowed as a key");
+    }
+    _o[key] = toJs(value);
+  }
+
+  @override
+  V remove(String key) {
+    final value = this[key];
+    _o.deleteProperty(key);
+    return value as V;
+  }
+
+  @override
+  Iterable<String> get keys => _obj.callMethod('keys', [_o]) as List<String>;
+
+  @override
+  bool containsKey(String key) => _o.hasProperty(key);
+
+  @override
+  V putIfAbsent(String key, V ifAbsent()) {
+    if (key == '__proto__') {
+      throw new ArgumentError("'__proto__' is disallowed as a key");
+    }
+    return Maps.putIfAbsent(this, key, ifAbsent) as V;
+  }
+
+  @override
+  void addAll(Map<String, V> other) {
+    if (other != null) {
+      other.forEach((k,v) => this[k] = v);
+    }
+  }
+
+  @override
+  void clear() => Maps.clear(this);
+}