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.
9 %CheckIsBootstrapping();
11 var GlobalArray = global.Array;
12 var GlobalObject = global.Object;
13 var GlobalString = global.String;
15 //-------------------------------------------------------------------
17 var stringIteratorIteratedStringSymbol =
18 GLOBAL_PRIVATE("StringIterator#iteratedString");
19 var stringIteratorNextIndexSymbol = GLOBAL_PRIVATE("StringIterator#next");
22 function StringIterator() {}
25 // 21.1.5.1 CreateStringIterator Abstract Operation
26 function CreateStringIterator(string) {
27 var s = TO_STRING_INLINE(string);
28 var iterator = new StringIterator;
29 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
30 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
35 // 21.1.5.2.2 %StringIteratorPrototype%[@@iterator]
36 function StringIteratorIterator() {
41 // 21.1.5.2.1 %StringIteratorPrototype%.next( )
42 function StringIteratorNext() {
43 var iterator = ToObject(this);
45 if (!HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
46 throw MakeTypeError('incompatible_method_receiver',
47 ['String Iterator.prototype.next']);
50 var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol);
51 if (IS_UNDEFINED(s)) {
52 return CreateIteratorResultObject(UNDEFINED, true);
55 var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol);
56 var length = TO_UINT32(s.length);
58 if (position >= length) {
59 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol,
61 return CreateIteratorResultObject(UNDEFINED, true);
64 var first = %_StringCharCodeAt(s, position);
65 var resultString = %_StringCharFromCode(first);
68 if (first >= 0xD800 && first <= 0xDBFF && position < length) {
69 var second = %_StringCharCodeAt(s, position);
70 if (second >= 0xDC00 && second <= 0xDFFF) {
71 resultString += %_StringCharFromCode(second);
76 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position);
78 return CreateIteratorResultObject(resultString, false);
82 // 21.1.3.27 String.prototype [ @@iterator ]( )
83 function StringPrototypeIterator() {
84 return CreateStringIterator(this);
87 //-------------------------------------------------------------------
89 %FunctionSetPrototype(StringIterator, new GlobalObject());
90 %FunctionSetInstanceClassName(StringIterator, 'String Iterator');
92 InstallFunctions(StringIterator.prototype, DONT_ENUM, GlobalArray(
93 'next', StringIteratorNext
95 %FunctionSetName(StringIteratorIterator, '[Symbol.iterator]');
96 %AddNamedProperty(StringIterator.prototype, symbolIterator,
97 StringIteratorIterator, DONT_ENUM);
98 %AddNamedProperty(StringIterator.prototype, symbolToStringTag,
99 "String Iterator", READ_ONLY | DONT_ENUM);
101 %FunctionSetName(StringPrototypeIterator, '[Symbol.iterator]');
102 %AddNamedProperty(GlobalString.prototype, symbolIterator,
103 StringPrototypeIterator, DONT_ENUM);