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Issue 2348493003: [builtins] move String.prototype[@@iterator] to C++ builtin (Closed)
Patch Set: V8 (rebase + fix bytecode expectations) Created 4 years, 2 months ago
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1 // Copyright 2014 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 GlobalString = global.String;
15 var IteratorPrototype = utils.ImportNow("IteratorPrototype");
16 var iteratorSymbol = utils.ImportNow("iterator_symbol");
17 var stringIteratorIteratedStringSymbol =
18 utils.ImportNow("string_iterator_iterated_string_symbol");
19 var stringIteratorNextIndexSymbol =
20 utils.ImportNow("string_iterator_next_index_symbol");
21 var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
22
23 // -------------------------------------------------------------------
24
25 function StringIterator() {}
26
27
28 // 21.1.5.1 CreateStringIterator Abstract Operation
29 function CreateStringIterator(string) {
30 CHECK_OBJECT_COERCIBLE(string, 'String.prototype[Symbol.iterator]');
31 var s = TO_STRING(string);
32 var iterator = new StringIterator;
33 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
34 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
35 return iterator;
36 }
37
38
39 // ES6 section 21.1.5.2.1 %StringIteratorPrototype%.next ( )
40 function StringIteratorNext() {
41 var iterator = this;
42 var value = UNDEFINED;
43 var done = true;
44
45 if (!IS_RECEIVER(iterator) ||
46 !HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
47 throw %make_type_error(kIncompatibleMethodReceiver,
48 'String Iterator.prototype.next');
49 }
50
51 var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol);
52 if (!IS_UNDEFINED(s)) {
53 var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol);
54 var length = TO_UINT32(s.length);
55 if (position >= length) {
56 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, UNDEFINED);
57 } else {
58 var first = %_StringCharCodeAt(s, position);
59 value = %_StringCharFromCode(first);
60 done = false;
61 position++;
62
63 if (first >= 0xD800 && first <= 0xDBFF && position < length) {
64 var second = %_StringCharCodeAt(s, position);
65 if (second >= 0xDC00 && second <= 0xDFFF) {
66 value += %_StringCharFromCode(second);
67 position++;
68 }
69 }
70
71 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position);
72 }
73 }
74 return %_CreateIterResultObject(value, done);
75 }
76
77
78 // 21.1.3.27 String.prototype [ @@iterator ]( )
79 function StringPrototypeIterator() {
80 return CreateStringIterator(this);
81 }
82
83 //-------------------------------------------------------------------
84
85 %FunctionSetPrototype(StringIterator, {__proto__: IteratorPrototype});
86 %FunctionSetInstanceClassName(StringIterator, 'String Iterator');
87
88 utils.InstallFunctions(StringIterator.prototype, DONT_ENUM, [
89 'next', StringIteratorNext
90 ]);
91 %AddNamedProperty(StringIterator.prototype, toStringTagSymbol,
92 "String Iterator", READ_ONLY | DONT_ENUM);
93
94 utils.SetFunctionName(StringPrototypeIterator, iteratorSymbol);
95 %AddNamedProperty(GlobalString.prototype, iteratorSymbol,
96 StringPrototypeIterator, DONT_ENUM);
97
98 })
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