| // Copyright 2013 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 $Array = global.Array; |
| |
| var ARRAY_ITERATOR_KIND_KEYS = 1; |
| var ARRAY_ITERATOR_KIND_VALUES = 2; |
| var ARRAY_ITERATOR_KIND_ENTRIES = 3; |
| // The spec draft also has "sparse" but it is never used. |
| |
| var iteratorObjectSymbol = %CreateSymbol(void 0); |
| var arrayIteratorNextIndexSymbol = %CreateSymbol(void 0); |
| var arrayIterationKindSymbol = %CreateSymbol(void 0); |
| |
| function ArrayIterator() {} |
| |
| // 15.4.5.1 CreateArrayIterator Abstract Operation |
| function CreateArrayIterator(array, kind) { |
| var object = ToObject(array); |
| var iterator = new ArrayIterator; |
| iterator[iteratorObjectSymbol] = object; |
| iterator[arrayIteratorNextIndexSymbol] = 0; |
| iterator[arrayIterationKindSymbol] = kind; |
| return iterator; |
| } |
| |
| // 15.19.4.3.4 CreateItrResultObject |
| function CreateIteratorResultObject(value, done) { |
| return {value: value, done: done}; |
| } |
| |
| // 15.4.5.2.2 ArrayIterator.prototype.next( ) |
| function ArrayIteratorNext() { |
| var iterator = ToObject(this); |
| var array = iterator[iteratorObjectSymbol]; |
| if (!array) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['Array Iterator.prototype.next']); |
| } |
| |
| var index = iterator[arrayIteratorNextIndexSymbol]; |
| var itemKind = iterator[arrayIterationKindSymbol]; |
| var length = TO_UINT32(array.length); |
| |
| // "sparse" is never used. |
| |
| if (index >= length) { |
| iterator[arrayIteratorNextIndexSymbol] = 1 / 0; // Infinity |
| return CreateIteratorResultObject(void 0, true); |
| } |
| |
| iterator[arrayIteratorNextIndexSymbol] = index + 1; |
| |
| if (itemKind == ARRAY_ITERATOR_KIND_VALUES) |
| return CreateIteratorResultObject(array[index], false); |
| |
| if (itemKind == ARRAY_ITERATOR_KIND_ENTRIES) |
| return CreateIteratorResultObject([index, array[index]], false); |
| |
| return CreateIteratorResultObject(index, false); |
| } |
| |
| function ArrayEntries() { |
| return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_ENTRIES); |
| } |
| |
| function ArrayValues() { |
| return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_VALUES); |
| } |
| |
| function ArrayKeys() { |
| return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_KEYS); |
| } |
| |
| function SetUpArrayIterator() { |
| %CheckIsBootstrapping(); |
| |
| %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator'); |
| %FunctionSetReadOnlyPrototype(ArrayIterator); |
| |
| InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array( |
| 'next', ArrayIteratorNext |
| )); |
| } |
| |
| SetUpArrayIterator(); |
| |
| function ExtendArrayPrototype() { |
| %CheckIsBootstrapping(); |
| |
| InstallFunctions($Array.prototype, DONT_ENUM, $Array( |
| 'entries', ArrayEntries, |
| 'values', ArrayValues, |
| 'keys', ArrayKeys |
| )); |
| } |
| |
| ExtendArrayPrototype(); |