ES6: Add support for Map and Set Iterator

src/collection-iterator.js

Index: src/collection-iterator.js
diff --git a/src/collection-iterator.js b/src/collection-iterator.js
new file mode 100644
index 0000000000000000000000000000000000000000..91fa8f0486a2a5f901aa50fa882aff328850f026
--- /dev/null
+++ b/src/collection-iterator.js
@@ -0,0 +1,148 @@
+// Copyright 2014 the V8 project authors. All rights reserved.
+// Redistribution and use in source and binary forms, with or without
+// modification, are permitted provided that the following conditions are
+// met:
+//
+//     * Redistributions of source code must retain the above copyright
+//       notice, this list of conditions and the following disclaimer.
+//     * Redistributions in binary form must reproduce the above
+//       copyright notice, this list of conditions and the following
+//       disclaimer in the documentation and/or other materials provided
+//       with the distribution.
+//     * Neither the name of Google Inc. nor the names of its
+//       contributors may be used to endorse or promote products derived
+//       from this software without specific prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+'use strict';
+
+
+// This file relies on the fact that the following declaration has been made
+// in runtime.js:
+// var $Set = global.Set;
+// var $Map = global.Map;
+
+
+function SetIteratorNext() {
+  if (!IS_SET_ITERATOR(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Set Iterator.prototype.next', this]);
+  }
+  return %SetIteratorNext(this);
+}
+
+
+function SetEntries() {
+  if (!IS_SET(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Set.prototype.entries', this]);
+  }
+  return %SetCreateIterator(this, ITERATOR_KIND_ENTRIES);
+}
+
+
+function SetValues() {
+  if (!IS_SET(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Set.prototype.values', this]);
+  }
+  return %SetCreateIterator(this, ITERATOR_KIND_VALUES);
+}
+
+
+function SetUpSetIterator() {
+  %CheckIsBootstrapping();
+
+  delete MapIterator.prototype.constructor;
+  %FunctionSetInstanceClassName(SetIterator, 'Set Iterator');
+  InstallFunctions(SetIterator.prototype, DONT_ENUM, $Array(
+    'next', SetIteratorNext
+  ));
+}
+
+SetUpSetIterator();
+
+
+function ExtendSetPrototype() {
+  %CheckIsBootstrapping();
+
+  InstallFunctions($Set.prototype, DONT_ENUM, $Array(
+    'entries', SetEntries,
+    'values', SetValues
+  ));
+}
+
+ExtendSetPrototype();
+
+
+function MapIteratorNext() {
+  if (!IS_MAP_ITERATOR(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Map Iterator.prototype.next', this]);
+  }
+  return %MapIteratorNext(this);
+}
+
+
+function MapEntries() {
+  if (!IS_MAP(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Map.prototype.entries', this]);
+  }
+  return %MapCreateIterator(this, ITERATOR_KIND_ENTRIES);
+}
+
+
+function MapKeys() {
+  if (!IS_MAP(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Map.prototype.keys', this]);
+  }
+  return %MapCreateIterator(this, ITERATOR_KIND_KEYS);
+}
+
+
+function MapValues() {
+  if (!IS_MAP(this)) {
+    throw MakeTypeError('incompatible_method_receiver',
+                        ['Map.prototype.values', this]);
+  }
+  return %MapCreateIterator(this, ITERATOR_KIND_VALUES);
+}
+
+
+function SetUpMapIterator() {
+  %CheckIsBootstrapping();
+
+  delete MapIterator.prototype.constructor;
+  %FunctionSetInstanceClassName(MapIterator, 'Map Iterator');
+  InstallFunctions(MapIterator.prototype, DONT_ENUM, $Array(
+    'next', MapIteratorNext
+  ));
+}
+
+SetUpMapIterator();
+
+
+function ExtendMapPrototype() {
+  %CheckIsBootstrapping();
+
+  InstallFunctions($Map.prototype, DONT_ENUM, $Array(
+    'entries', MapEntries,
+    'keys', MapKeys,
+    'values', MapValues
+  ));
+}
+
+ExtendMapPrototype();