1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
// 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// section numbers below are already out of date as of the May 2014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_PRIVATE(iterator, arrayIteratorObjectSymbol)) {
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, $Array(
'next', ArrayIteratorNext
));
%FunctionSetName(ArrayIteratorIterator, '[Symbol.iterator]');
%AddNamedProperty(ArrayIterator.prototype, symbolIterator,
ArrayIteratorIterator, DONT_ENUM);
}
SetUpArrayIterator();
function ExtendArrayPrototype() {
%CheckIsBootstrapping();
InstallFunctions($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();
|
