| // Copyright 2013 the V8 project authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| 'use strict'; |
| |
| |
| // This file relies on the fact that the following declaration has been made |
| // in runtime.js: |
| // var $Array = global.Array; |
| |
| |
| var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object"); |
| var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next"); |
| var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind"); |
| |
| |
| function ArrayIterator() {} |
| |
| |
| // TODO(wingo): Update section numbers when ES6 has stabilized. The |
| // section numbers below are already out of date as of the May 2014 |
| // draft. |
| |
| |
| // 15.4.5.1 CreateArrayIterator Abstract Operation |
| function CreateArrayIterator(array, kind) { |
| var object = ToObject(array); |
| var iterator = new ArrayIterator; |
| SET_PRIVATE(iterator, arrayIteratorObjectSymbol, object); |
| SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, 0); |
| SET_PRIVATE(iterator, arrayIterationKindSymbol, kind); |
| return iterator; |
| } |
| |
| |
| // 15.19.4.3.4 CreateItrResultObject |
| function CreateIteratorResultObject(value, done) { |
| return {value: value, done: done}; |
| } |
| |
| |
| // 22.1.5.2.2 %ArrayIteratorPrototype%[@@iterator] |
| function ArrayIteratorIterator() { |
| return this; |
| } |
| |
| |
| // 15.4.5.2.2 ArrayIterator.prototype.next( ) |
| function ArrayIteratorNext() { |
| var iterator = ToObject(this); |
| |
| if (!HAS_DEFINED_PRIVATE(iterator, arrayIteratorNextIndexSymbol)) { |
| throw MakeTypeError('incompatible_method_receiver', |
| ['Array Iterator.prototype.next']); |
| } |
| |
| var array = GET_PRIVATE(iterator, arrayIteratorObjectSymbol); |
| if (IS_UNDEFINED(array)) { |
| return CreateIteratorResultObject(UNDEFINED, true); |
| } |
| |
| var index = GET_PRIVATE(iterator, arrayIteratorNextIndexSymbol); |
| var itemKind = GET_PRIVATE(iterator, arrayIterationKindSymbol); |
| var length = TO_UINT32(array.length); |
| |
| // "sparse" is never used. |
| |
| if (index >= length) { |
| SET_PRIVATE(iterator, arrayIteratorObjectSymbol, UNDEFINED); |
| return CreateIteratorResultObject(UNDEFINED, true); |
| } |
| |
| SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, index + 1); |
| |
| if (itemKind == ITERATOR_KIND_VALUES) { |
| return CreateIteratorResultObject(array[index], false); |
| } |
| |
| if (itemKind == ITERATOR_KIND_ENTRIES) { |
| return CreateIteratorResultObject([index, array[index]], false); |
| } |
| |
| return CreateIteratorResultObject(index, false); |
| } |
| |
| |
| function ArrayEntries() { |
| return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES); |
| } |
| |
| |
| function ArrayValues() { |
| return CreateArrayIterator(this, ITERATOR_KIND_VALUES); |
| } |
| |
| |
| function ArrayKeys() { |
| return CreateArrayIterator(this, ITERATOR_KIND_KEYS); |
| } |
| |
| |
| function SetUpArrayIterator() { |
| %CheckIsBootstrapping(); |
| |
| %FunctionSetPrototype(ArrayIterator, new $Object()); |
| %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator'); |
| |
| InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array( |
| 'next', ArrayIteratorNext |
| )); |
| %FunctionSetName(ArrayIteratorIterator, '[Symbol.iterator]'); |
| %AddNamedProperty(ArrayIterator.prototype, symbolIterator, |
| ArrayIteratorIterator, DONT_ENUM); |
| %AddNamedProperty(ArrayIterator.prototype, symbolToStringTag, |
| "Array Iterator", READ_ONLY | DONT_ENUM); |
| } |
| SetUpArrayIterator(); |
| |
| |
| function ExtendArrayPrototype() { |
| %CheckIsBootstrapping(); |
| |
| InstallFunctions($Array.prototype, DONT_ENUM, $Array( |
| // No 'values' since it breaks webcompat: http://crbug.com/409858 |
| 'entries', ArrayEntries, |
| 'keys', ArrayKeys |
| )); |
| |
| %AddNamedProperty($Array.prototype, symbolIterator, ArrayValues, DONT_ENUM); |
| } |
| ExtendArrayPrototype(); |
| |
| |
| function ExtendTypedArrayPrototypes() { |
| %CheckIsBootstrapping(); |
| |
| macro TYPED_ARRAYS(FUNCTION) |
| FUNCTION(Uint8Array) |
| FUNCTION(Int8Array) |
| FUNCTION(Uint16Array) |
| FUNCTION(Int16Array) |
| FUNCTION(Uint32Array) |
| FUNCTION(Int32Array) |
| FUNCTION(Float32Array) |
| FUNCTION(Float64Array) |
| FUNCTION(Uint8ClampedArray) |
| endmacro |
| |
| macro EXTEND_TYPED_ARRAY(NAME) |
| %AddNamedProperty($NAME.prototype, 'entries', ArrayEntries, DONT_ENUM); |
| %AddNamedProperty($NAME.prototype, 'values', ArrayValues, DONT_ENUM); |
| %AddNamedProperty($NAME.prototype, 'keys', ArrayKeys, DONT_ENUM); |
| %AddNamedProperty($NAME.prototype, symbolIterator, ArrayValues, DONT_ENUM); |
| endmacro |
| |
| TYPED_ARRAYS(EXTEND_TYPED_ARRAY) |
| } |
| ExtendTypedArrayPrototypes(); |