dd06f905cb
R=mvstanton@chromium.org Review URL: https://codereview.chromium.org/1090563002 Cr-Commit-Position: refs/heads/master@{#27839}
105 lines
3.0 KiB
JavaScript
105 lines
3.0 KiB
JavaScript
// Copyright 2014 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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(function() {
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"use strict";
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%CheckIsBootstrapping();
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var GlobalObject = global.Object;
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var GlobalString = global.String;
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//-------------------------------------------------------------------
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var stringIteratorIteratedStringSymbol =
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GLOBAL_PRIVATE("StringIterator#iteratedString");
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var stringIteratorNextIndexSymbol = GLOBAL_PRIVATE("StringIterator#next");
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function StringIterator() {}
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// 21.1.5.1 CreateStringIterator Abstract Operation
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function CreateStringIterator(string) {
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var s = TO_STRING_INLINE(string);
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var iterator = new StringIterator;
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SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol, s);
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SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, 0);
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return iterator;
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}
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// 21.1.5.2.2 %StringIteratorPrototype%[@@iterator]
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function StringIteratorIterator() {
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return this;
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}
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// 21.1.5.2.1 %StringIteratorPrototype%.next( )
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function StringIteratorNext() {
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var iterator = ToObject(this);
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if (!HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
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throw MakeTypeError('incompatible_method_receiver',
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['String Iterator.prototype.next']);
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}
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var s = GET_PRIVATE(iterator, stringIteratorIteratedStringSymbol);
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if (IS_UNDEFINED(s)) {
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return $iteratorCreateResultObject(UNDEFINED, true);
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}
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var position = GET_PRIVATE(iterator, stringIteratorNextIndexSymbol);
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var length = TO_UINT32(s.length);
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if (position >= length) {
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SET_PRIVATE(iterator, stringIteratorIteratedStringSymbol,
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UNDEFINED);
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return $iteratorCreateResultObject(UNDEFINED, true);
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}
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var first = %_StringCharCodeAt(s, position);
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var resultString = %_StringCharFromCode(first);
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position++;
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if (first >= 0xD800 && first <= 0xDBFF && position < length) {
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var second = %_StringCharCodeAt(s, position);
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if (second >= 0xDC00 && second <= 0xDFFF) {
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resultString += %_StringCharFromCode(second);
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position++;
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}
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}
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SET_PRIVATE(iterator, stringIteratorNextIndexSymbol, position);
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return $iteratorCreateResultObject(resultString, false);
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}
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// 21.1.3.27 String.prototype [ @@iterator ]( )
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function StringPrototypeIterator() {
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return CreateStringIterator(this);
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}
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//-------------------------------------------------------------------
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%FunctionSetPrototype(StringIterator, new GlobalObject());
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%FunctionSetInstanceClassName(StringIterator, 'String Iterator');
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InstallFunctions(StringIterator.prototype, DONT_ENUM, [
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'next', StringIteratorNext
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]);
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%FunctionSetName(StringIteratorIterator, '[Symbol.iterator]');
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%AddNamedProperty(StringIterator.prototype, symbolIterator,
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StringIteratorIterator, DONT_ENUM);
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%AddNamedProperty(StringIterator.prototype, symbolToStringTag,
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"String Iterator", READ_ONLY | DONT_ENUM);
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%FunctionSetName(StringPrototypeIterator, '[Symbol.iterator]');
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%AddNamedProperty(GlobalString.prototype, symbolIterator,
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StringPrototypeIterator, DONT_ENUM);
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})();
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