michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: function IteratorIdentity() {
michael@0:     return this;
michael@0: }
michael@0: 
michael@0: var LegacyIteratorWrapperMap = new std_WeakMap();
michael@0: 
michael@0: function LegacyIteratorNext(arg) {
michael@0:     var iter = callFunction(std_WeakMap_get, LegacyIteratorWrapperMap, this);
michael@0:     try {
michael@0:         return { value: iter.next(arg), done: false };
michael@0:     } catch (e) {
michael@0:         if (e instanceof std_StopIteration)
michael@0:             return { value: undefined, done: true };
michael@0:         throw e;
michael@0:     }
michael@0: }
michael@0: 
michael@0: function LegacyIteratorThrow(exn) {
michael@0:     var iter = callFunction(std_WeakMap_get, LegacyIteratorWrapperMap, this);
michael@0:     try {
michael@0:         return { value: iter.throw(exn), done: false };
michael@0:     } catch (e) {
michael@0:         if (e instanceof std_StopIteration)
michael@0:             return { value: undefined, done: true };
michael@0:         throw e;
michael@0:     }
michael@0: }
michael@0: 
michael@0: function LegacyIterator(iter) {
michael@0:     callFunction(std_WeakMap_set, LegacyIteratorWrapperMap, this, iter);
michael@0: }
michael@0: 
michael@0: function LegacyGeneratorIterator(iter) {
michael@0:     callFunction(std_WeakMap_set, LegacyIteratorWrapperMap, this, iter);
michael@0: }
michael@0: 
michael@0: var LegacyIteratorsInitialized = std_Object_create(null);
michael@0: 
michael@0: function InitLegacyIterators() {
michael@0:     var props = std_Object_create(null);
michael@0: 
michael@0:     props.next = std_Object_create(null);
michael@0:     props.next.value = LegacyIteratorNext;
michael@0:     props.next.enumerable = false;
michael@0:     props.next.configurable = true;
michael@0:     props.next.writable = true;
michael@0: 
michael@0:     props[std_iterator] = std_Object_create(null);
michael@0:     props[std_iterator].value = IteratorIdentity;
michael@0:     props[std_iterator].enumerable = false;
michael@0:     props[std_iterator].configurable = true;
michael@0:     props[std_iterator].writable = true;
michael@0: 
michael@0:     var LegacyIteratorProto = std_Object_create(GetIteratorPrototype(), props);
michael@0:     MakeConstructible(LegacyIterator, LegacyIteratorProto);
michael@0: 
michael@0:     props.throw = std_Object_create(null);
michael@0:     props.throw.value = LegacyIteratorThrow;
michael@0:     props.throw.enumerable = false;
michael@0:     props.throw.configurable = true;
michael@0:     props.throw.writable = true;
michael@0: 
michael@0:     var LegacyGeneratorIteratorProto = std_Object_create(GetIteratorPrototype(), props);
michael@0:     MakeConstructible(LegacyGeneratorIterator, LegacyGeneratorIteratorProto);
michael@0: 
michael@0:     LegacyIteratorsInitialized.initialized = true;
michael@0: }
michael@0: 
michael@0: function NewLegacyIterator(iter, wrapper) {
michael@0:     if (!LegacyIteratorsInitialized.initialized)
michael@0:         InitLegacyIterators();
michael@0: 
michael@0:     return new wrapper(iter);
michael@0: }
michael@0: 
michael@0: function LegacyIteratorShim() {
michael@0:     return NewLegacyIterator(ToObject(this), LegacyIterator);
michael@0: }
michael@0: 
michael@0: function LegacyGeneratorIteratorShim() {
michael@0:     return NewLegacyIterator(ToObject(this), LegacyGeneratorIterator);
michael@0: }