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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 (function(global, utils) { | |
6 | |
7 "use strict"; | |
8 | |
9 %CheckIsBootstrapping(); | |
10 | |
11 // ----------------------------------------------------------------------- | |
12 // Imports | |
13 | |
14 var arrayIterationKindSymbol = | |
15 utils.ImportNow("array_iteration_kind_symbol"); | |
16 var arrayIteratorNextIndexSymbol = | |
17 utils.ImportNow("array_iterator_next_symbol"); | |
18 var arrayIteratorObjectSymbol = | |
19 utils.ImportNow("array_iterator_object_symbol"); | |
20 var GlobalArray = global.Array; | |
21 var IteratorPrototype = utils.ImportNow("IteratorPrototype"); | |
22 var iteratorSymbol = utils.ImportNow("iterator_symbol"); | |
23 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol"); | |
24 var GlobalTypedArray = %object_get_prototype_of(global.Uint8Array); | |
25 | |
26 // ----------------------------------------------------------------------- | |
27 | |
28 function ArrayIterator() {} | |
29 | |
30 | |
31 // TODO(wingo): Update section numbers when ES6 has stabilized. The | |
32 // section numbers below are already out of date as of the May 2014 | |
33 // draft. | |
34 | |
35 | |
36 // 15.4.5.1 CreateArrayIterator Abstract Operation | |
37 function CreateArrayIterator(array, kind) { | |
38 var object = TO_OBJECT(array); | |
39 var iterator = new ArrayIterator; | |
40 SET_PRIVATE(iterator, arrayIteratorObjectSymbol, object); | |
41 SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, 0); | |
42 SET_PRIVATE(iterator, arrayIterationKindSymbol, kind); | |
43 return iterator; | |
44 } | |
45 | |
46 | |
47 // 22.1.5.2.2 %ArrayIteratorPrototype%[@@iterator] | |
48 function ArrayIteratorIterator() { | |
49 return this; | |
50 } | |
51 | |
52 | |
53 // ES6 section 22.1.5.2.1 %ArrayIteratorPrototype%.next( ) | |
54 function ArrayIteratorNext() { | |
55 var iterator = this; | |
56 var value = UNDEFINED; | |
57 var done = true; | |
58 | |
59 if (!IS_RECEIVER(iterator) || | |
60 !HAS_DEFINED_PRIVATE(iterator, arrayIteratorNextIndexSymbol)) { | |
61 throw %make_type_error(kIncompatibleMethodReceiver, | |
62 'Array Iterator.prototype.next', this); | |
63 } | |
64 | |
65 var array = GET_PRIVATE(iterator, arrayIteratorObjectSymbol); | |
66 if (!IS_UNDEFINED(array)) { | |
67 var index = GET_PRIVATE(iterator, arrayIteratorNextIndexSymbol); | |
68 var itemKind = GET_PRIVATE(iterator, arrayIterationKindSymbol); | |
69 var length = TO_UINT32(array.length); | |
70 | |
71 // "sparse" is never used. | |
72 | |
73 if (index >= length) { | |
74 SET_PRIVATE(iterator, arrayIteratorObjectSymbol, UNDEFINED); | |
75 } else { | |
76 SET_PRIVATE(iterator, arrayIteratorNextIndexSymbol, index + 1); | |
77 | |
78 if (itemKind == ITERATOR_KIND_VALUES) { | |
79 value = array[index]; | |
80 } else if (itemKind == ITERATOR_KIND_ENTRIES) { | |
81 value = [index, array[index]]; | |
82 } else { | |
83 value = index; | |
84 } | |
85 done = false; | |
86 } | |
87 } | |
88 | |
89 return %_CreateIterResultObject(value, done); | |
90 } | |
91 | |
92 | |
93 function ArrayEntries() { | |
94 return CreateArrayIterator(this, ITERATOR_KIND_ENTRIES); | |
95 } | |
96 | |
97 | |
98 function ArrayValues() { | |
99 return CreateArrayIterator(this, ITERATOR_KIND_VALUES); | |
100 } | |
101 | |
102 | |
103 function ArrayKeys() { | |
104 return CreateArrayIterator(this, ITERATOR_KIND_KEYS); | |
105 } | |
106 | |
107 // TODO(littledan): Check for detached TypedArray in these three methods | |
108 function TypedArrayEntries() { | |
109 if (!IS_TYPEDARRAY(this)) throw %make_type_error(kNotTypedArray); | |
110 return %_Call(ArrayEntries, this); | |
111 } | |
112 | |
113 | |
114 function TypedArrayValues() { | |
115 if (!IS_TYPEDARRAY(this)) throw %make_type_error(kNotTypedArray); | |
116 return %_Call(ArrayValues, this); | |
117 } | |
118 | |
119 | |
120 function TypedArrayKeys() { | |
121 if (!IS_TYPEDARRAY(this)) throw %make_type_error(kNotTypedArray); | |
122 return %_Call(ArrayKeys, this); | |
123 } | |
124 | |
125 | |
126 %FunctionSetPrototype(ArrayIterator, {__proto__: IteratorPrototype}); | |
127 %FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator'); | |
128 | |
129 utils.InstallFunctions(ArrayIterator.prototype, DONT_ENUM, [ | |
130 'next', ArrayIteratorNext | |
131 ]); | |
132 utils.SetFunctionName(ArrayIteratorIterator, iteratorSymbol); | |
133 %AddNamedProperty(ArrayIterator.prototype, toStringTagSymbol, | |
134 "Array Iterator", READ_ONLY | DONT_ENUM); | |
135 | |
136 utils.InstallFunctions(GlobalArray.prototype, DONT_ENUM, [ | |
137 // No 'values' since it breaks webcompat: http://crbug.com/409858 | |
138 'entries', ArrayEntries, | |
139 'keys', ArrayKeys | |
140 ]); | |
141 | |
142 // TODO(adam): Remove these calls once 'values' is in the above | |
143 // InstallFunctions block, as they'll be redundant. | |
144 utils.SetFunctionName(ArrayValues, 'values'); | |
145 %FunctionRemovePrototype(ArrayValues); | |
146 %SetNativeFlag(ArrayValues); | |
147 | |
148 %AddNamedProperty(GlobalArray.prototype, iteratorSymbol, ArrayValues, | |
149 DONT_ENUM); | |
150 | |
151 utils.InstallFunctions(GlobalTypedArray.prototype, DONT_ENUM, [ | |
152 'entries', TypedArrayEntries, | |
153 'keys', TypedArrayKeys, | |
154 'values', TypedArrayValues | |
155 ]); | |
156 %AddNamedProperty(GlobalTypedArray.prototype, | |
157 iteratorSymbol, TypedArrayValues, DONT_ENUM); | |
158 | |
159 // ------------------------------------------------------------------- | |
160 // Exports | |
161 | |
162 utils.Export(function(to) { | |
163 to.ArrayValues = ArrayValues; | |
164 }); | |
165 | |
166 %InstallToContext(["array_values_iterator", ArrayValues]); | |
167 | |
168 }) | |
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