Ben Murdoch | b8a8cc1 | 2014-11-26 15:28:44 +0000 | [diff] [blame^] | 1 | // Copyright 2013 the V8 project authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | 'use strict'; |
| 6 | |
| 7 | |
| 8 | // This file relies on the fact that the following declaration has been made |
| 9 | // in runtime.js: |
| 10 | // var $Array = global.Array; |
| 11 | |
| 12 | |
| 13 | var arrayIteratorObjectSymbol = GLOBAL_PRIVATE("ArrayIterator#object"); |
| 14 | var arrayIteratorNextIndexSymbol = GLOBAL_PRIVATE("ArrayIterator#next"); |
| 15 | var arrayIterationKindSymbol = GLOBAL_PRIVATE("ArrayIterator#kind"); |
| 16 | |
| 17 | |
| 18 | function ArrayIterator() {} |
| 19 | |
| 20 | |
| 21 | // TODO(wingo): Update section numbers when ES6 has stabilized. The |
| 22 | // section numbers below are already out of date as of the May 2014 |
| 23 | // draft. |
| 24 | |
| 25 | |
| 26 | // 15.4.5.1 CreateArrayIterator Abstract Operation |
| 27 | function CreateArrayIterator(array, kind) { |
| 28 | var object = ToObject(array); |
| 29 | var iterator = new ArrayIterator; |
| 30 | SET_PRIVATE(iterator, arrayIteratorObjectSymbol, object); |
| 31 | SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, 0); |
| 32 | SET_PRIVATE(iterator, arrayIterationKindSymbol, kind); |
| 33 | return iterator; |
| 34 | } |
| 35 | |
| 36 | |
| 37 | // 15.19.4.3.4 CreateItrResultObject |
| 38 | function CreateIteratorResultObject(value, done) { |
| 39 | return {value: value, done: done}; |
| 40 | } |
| 41 | |
| 42 | |
| 43 | // 22.1.5.2.2 %ArrayIteratorPrototype%[@@iterator] |
| 44 | function ArrayIteratorIterator() { |
| 45 | return this; |
| 46 | } |
| 47 | |
| 48 | |
| 49 | // 15.4.5.2.2 ArrayIterator.prototype.next( ) |
| 50 | function ArrayIteratorNext() { |
| 51 | var iterator = ToObject(this); |
| 52 | |
| 53 | if (!HAS_DEFINED_PRIVATE(iterator, arrayIteratorNextIndexSymbol)) { |
| 54 | throw MakeTypeError('incompatible_method_receiver', |
| 55 | ['Array Iterator.prototype.next']); |
| 56 | } |
| 57 | |
| 58 | var array = GET_PRIVATE(iterator, arrayIteratorObjectSymbol); |
| 59 | if (IS_UNDEFINED(array)) { |
| 60 | return CreateIteratorResultObject(UNDEFINED, true); |
| 61 | } |
| 62 | |
| 63 | var index = GET_PRIVATE(iterator, arrayIteratorNextIndexSymbol); |
| 64 | var itemKind = GET_PRIVATE(iterator, arrayIterationKindSymbol); |
| 65 | var length = TO_UINT32(array.length); |
| 66 | |
| 67 | // "sparse" is never used. |
| 68 | |
| 69 | if (index >= length) { |
| 70 | SET_PRIVATE(iterator, arrayIteratorObjectSymbol, UNDEFINED); |
| 71 | return CreateIteratorResultObject(UNDEFINED, true); |
| 72 | } |
| 73 | |
| 74 | SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, index + 1); |
| 75 | |
| 76 | if (itemKind == ITERATOR_KIND_VALUES) { |
| 77 | return CreateIteratorResultObject(array[index], false); |
| 78 | } |
| 79 | |
| 80 | if (itemKind == ITERATOR_KIND_ENTRIES) { |
| 81 | return CreateIteratorResultObject([index, array[index]], false); |
| 82 | } |
| 83 | |
| 84 | return CreateIteratorResultObject(index, false); |
| 85 | } |
| 86 | |
| 87 | |
| 88 | function ArrayEntries() { |
| 89 | return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES); |
| 90 | } |
| 91 | |
| 92 | |
| 93 | function ArrayValues() { |
| 94 | return CreateArrayIterator(this, ITERATOR_KIND_VALUES); |
| 95 | } |
| 96 | |
| 97 | |
| 98 | function ArrayKeys() { |
| 99 | return CreateArrayIterator(this, ITERATOR_KIND_KEYS); |
| 100 | } |
| 101 | |
| 102 | |
| 103 | function SetUpArrayIterator() { |
| 104 | %CheckIsBootstrapping(); |
| 105 | |
| 106 | %FunctionSetPrototype(ArrayIterator, new $Object()); |
| 107 | %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator'); |
| 108 | |
| 109 | InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array( |
| 110 | 'next', ArrayIteratorNext |
| 111 | )); |
| 112 | %FunctionSetName(ArrayIteratorIterator, '[Symbol.iterator]'); |
| 113 | %AddNamedProperty(ArrayIterator.prototype, symbolIterator, |
| 114 | ArrayIteratorIterator, DONT_ENUM); |
| 115 | } |
| 116 | SetUpArrayIterator(); |
| 117 | |
| 118 | |
| 119 | function ExtendArrayPrototype() { |
| 120 | %CheckIsBootstrapping(); |
| 121 | |
| 122 | InstallFunctions($Array.prototype, DONT_ENUM, $Array( |
| 123 | // No 'values' since it breaks webcompat: http://crbug.com/409858 |
| 124 | 'entries', ArrayEntries, |
| 125 | 'keys', ArrayKeys |
| 126 | )); |
| 127 | |
| 128 | %AddNamedProperty($Array.prototype, symbolIterator, ArrayValues, DONT_ENUM); |
| 129 | } |
| 130 | ExtendArrayPrototype(); |
| 131 | |
| 132 | |
| 133 | function ExtendTypedArrayPrototypes() { |
| 134 | %CheckIsBootstrapping(); |
| 135 | |
| 136 | macro TYPED_ARRAYS(FUNCTION) |
| 137 | FUNCTION(Uint8Array) |
| 138 | FUNCTION(Int8Array) |
| 139 | FUNCTION(Uint16Array) |
| 140 | FUNCTION(Int16Array) |
| 141 | FUNCTION(Uint32Array) |
| 142 | FUNCTION(Int32Array) |
| 143 | FUNCTION(Float32Array) |
| 144 | FUNCTION(Float64Array) |
| 145 | FUNCTION(Uint8ClampedArray) |
| 146 | endmacro |
| 147 | |
| 148 | macro EXTEND_TYPED_ARRAY(NAME) |
| 149 | %AddNamedProperty($NAME.prototype, 'entries', ArrayEntries, DONT_ENUM); |
| 150 | %AddNamedProperty($NAME.prototype, 'values', ArrayValues, DONT_ENUM); |
| 151 | %AddNamedProperty($NAME.prototype, 'keys', ArrayKeys, DONT_ENUM); |
| 152 | %AddNamedProperty($NAME.prototype, symbolIterator, ArrayValues, DONT_ENUM); |
| 153 | endmacro |
| 154 | |
| 155 | TYPED_ARRAYS(EXTEND_TYPED_ARRAY) |
| 156 | } |
| 157 | ExtendTypedArrayPrototypes(); |