OLD | NEW |
(Empty) | |
| 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 'use strict'; |
| 6 |
| 7 |
| 8 // This file relies on the fact that the following declaration has been made |
| 9 // in runtime.js: |
| 10 // var $String = global.String; |
| 11 |
| 12 |
| 13 var stringIteratorIteratedStringSymbol = |
| 14 GLOBAL_PRIVATE("StringIterator#iteratedString"); |
| 15 var stringIteratorNextIndexSymbol = GLOBAL_PRIVATE("StringIterator#next"); |
| 16 |
| 17 |
| 18 function StringIterator() {} |
| 19 |
| 20 |
| 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); |
| 27 return iterator; |
| 28 } |
| 29 |
| 30 |
| 31 // 21.1.5.2.2 %StringIteratorPrototype%[@@iterator] |
| 32 function StringIteratorIterator() { |
| 33 return this; |
| 34 } |
| 35 |
| 36 |
| 37 // 21.1.5.2.1 %StringIteratorPrototype%.next( ) |
| 38 function StringIteratorNext() { |
| 39 var iterator = ToObject(this); |
| 40 |
| 41 if (!HAS_PRIVATE(iterator, stringIteratorIteratedStringSymbol)) { |
| 42 throw MakeTypeError('incompatible_method_receiver', |
| 43 ['String Iterator.prototype.next']); |
| 44 } |
| 45 |
| 46 var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol); |
| 47 if (IS_UNDEFINED(s)) { |
| 48 return CreateIteratorResultObject(UNDEFINED, true); |
| 49 } |
| 50 |
| 51 var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol); |
| 52 var length = TO_UINT32(s.length); |
| 53 |
| 54 if (position >= length) { |
| 55 SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, UNDEFINED); |
| 56 return CreateIteratorResultObject(UNDEFINED, true); |
| 57 } |
| 58 |
| 59 var first = %_StringCharCodeAt(s, position); |
| 60 var resultString = %_StringCharFromCode(first); |
| 61 position++; |
| 62 |
| 63 if (first >= 0xD800 && first <= 0xDBFF && position < length) { |
| 64 var second = %_StringCharCodeAt(s, position); |
| 65 if (second >= 0xDC00 && second <= 0xDFFF) { |
| 66 resultString += %_StringCharFromCode(second); |
| 67 position++; |
| 68 } |
| 69 } |
| 70 |
| 71 SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position); |
| 72 |
| 73 return CreateIteratorResultObject(resultString, false); |
| 74 } |
| 75 |
| 76 |
| 77 function SetUpStringIterator() { |
| 78 %CheckIsBootstrapping(); |
| 79 |
| 80 %FunctionSetPrototype(StringIterator, new $Object()); |
| 81 %FunctionSetInstanceClassName(StringIterator, 'String Iterator'); |
| 82 |
| 83 InstallFunctions(StringIterator.prototype, DONT_ENUM, $Array( |
| 84 'next', StringIteratorNext |
| 85 )); |
| 86 %FunctionSetName(StringIteratorIterator, '[Symbol.iterator]'); |
| 87 %SetProperty(StringIterator.prototype, symbolIterator, StringIteratorIterator, |
| 88 DONT_ENUM); |
| 89 } |
| 90 SetUpStringIterator(); |
| 91 |
| 92 |
| 93 // 21.1.3.27 String.prototype [ @@iterator ]( ) |
| 94 function StringPrototypeIterator() { |
| 95 return CreateStringIterator(this); |
| 96 } |
| 97 |
| 98 |
| 99 function ExtendStringPrototypeWithIterator() { |
| 100 %CheckIsBootstrapping(); |
| 101 |
| 102 %FunctionSetName(StringPrototypeIterator, '[Symbol.iterator]'); |
| 103 %SetProperty($String.prototype, symbolIterator, StringPrototypeIterator, |
| 104 DONT_ENUM); |
| 105 } |
| 106 ExtendStringPrototypeWithIterator(); |
OLD | NEW |