a295cb7846
R=cbruni@chromium.org Review URL: https://codereview.chromium.org/1413173003 Cr-Commit-Position: refs/heads/master@{#31467}
103 lines
3.1 KiB
JavaScript
103 lines
3.1 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(global, utils) {
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"use strict";
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%CheckIsBootstrapping();
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// -------------------------------------------------------------------
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// Imports
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var GlobalString = global.String;
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var IteratorPrototype = utils.ImportNow("IteratorPrototype");
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var iteratorSymbol = utils.ImportNow("iterator_symbol");
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var MakeTypeError;
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var stringIteratorIteratedStringSymbol =
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utils.ImportNow("string_iterator_iterated_string_symbol");
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var stringIteratorNextIndexSymbol =
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utils.ImportNow("string_iterator_next_index_symbol");
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var toStringTagSymbol = utils.ImportNow("to_string_tag_symbol");
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utils.Import(function(from) {
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MakeTypeError = from.MakeTypeError;
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});
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// -------------------------------------------------------------------
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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(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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// ES6 section 21.1.5.2.1 %StringIteratorPrototype%.next ( )
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function StringIteratorNext() {
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var iterator = this;
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var value = UNDEFINED;
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var done = true;
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if (!IS_SPEC_OBJECT(iterator) ||
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!HAS_DEFINED_PRIVATE(iterator, stringIteratorNextIndexSymbol)) {
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throw MakeTypeError(kIncompatibleMethodReceiver,
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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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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, UNDEFINED);
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} else {
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var first = %_StringCharCodeAt(s, position);
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value = %_StringCharFromCode(first);
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done = false;
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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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value += %_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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}
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}
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return %_CreateIterResultObject(value, done);
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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, {__proto__: IteratorPrototype});
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%FunctionSetInstanceClassName(StringIterator, 'String Iterator');
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utils.InstallFunctions(StringIterator.prototype, DONT_ENUM, [
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'next', StringIteratorNext
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]);
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%AddNamedProperty(StringIterator.prototype, toStringTagSymbol,
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"String Iterator", READ_ONLY | DONT_ENUM);
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utils.SetFunctionName(StringPrototypeIterator, iteratorSymbol);
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%AddNamedProperty(GlobalString.prototype, iteratorSymbol,
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StringPrototypeIterator, DONT_ENUM);
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})
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