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.
8 // This file relies on the fact that the following declaration has been made
10 // var $String = global.String;
13 var stringIteratorIteratedStringSymbol =
14 GLOBAL_PRIVATE("StringIterator#iteratedString");
15 var stringIteratorNextIndexSymbol = GLOBAL_PRIVATE("StringIterator#next");
18 function StringIterator() {}
21 // 21.1.5.1 CreateStringIterator Abstract Operation
22 function CreateStringIterator(string) {
23 var s = TO_STRING_INLINE(string);
24 var iterator = new StringIterator;
25 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
26 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
31 // 21.1.5.2.2 %StringIteratorPrototype%[@@iterator]
32 function StringIteratorIterator() {
37 // 21.1.5.2.1 %StringIteratorPrototype%.next( )
38 function StringIteratorNext() {
39 var iterator = ToObject(this);
41 if (!HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
42 throw MakeTypeError('incompatible_method_receiver',
43 ['String Iterator.prototype.next']);
46 var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol);
47 if (IS_UNDEFINED(s)) {
48 return CreateIteratorResultObject(UNDEFINED, true);
51 var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol);
52 var length = TO_UINT32(s.length);
54 if (position >= length) {
55 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol,
57 return CreateIteratorResultObject(UNDEFINED, true);
60 var first = %_StringCharCodeAt(s, position);
61 var resultString = %_StringCharFromCode(first);
64 if (first >= 0xD800 && first <= 0xDBFF && position < length) {
65 var second = %_StringCharCodeAt(s, position);
66 if (second >= 0xDC00 && second <= 0xDFFF) {
67 resultString += %_StringCharFromCode(second);
72 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position);
74 return CreateIteratorResultObject(resultString, false);
78 function SetUpStringIterator() {
79 %CheckIsBootstrapping();
81 %FunctionSetPrototype(StringIterator, new $Object());
82 %FunctionSetInstanceClassName(StringIterator, 'String Iterator');
84 InstallFunctions(StringIterator.prototype, DONT_ENUM, $Array(
85 'next', StringIteratorNext
87 %FunctionSetName(StringIteratorIterator, '[Symbol.iterator]');
88 %AddNamedProperty(StringIterator.prototype, symbolIterator,
89 StringIteratorIterator, DONT_ENUM);
90 %AddNamedProperty(StringIterator.prototype, symbolToStringTag,
91 "String Iterator", READ_ONLY | DONT_ENUM);
93 SetUpStringIterator();
96 // 21.1.3.27 String.prototype [ @@iterator ]( )
97 function StringPrototypeIterator() {
98 return CreateStringIterator(this);
102 function ExtendStringPrototypeWithIterator() {
103 %CheckIsBootstrapping();
105 %FunctionSetName(StringPrototypeIterator, '[Symbol.iterator]');
106 %AddNamedProperty($String.prototype, symbolIterator,
107 StringPrototypeIterator, DONT_ENUM);
109 ExtendStringPrototypeWithIterator();