61 lines
2.5 KiB
JavaScript
61 lines
2.5 KiB
JavaScript
/*
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* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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function next()
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{
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"use strict";
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if (!@isStringIterator(this))
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@throwTypeError("%StringIteratorPrototype%.next requires that |this| be a String Iterator instance");
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var done = true;
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var value = @undefined;
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var position = @getStringIteratorInternalField(this, @stringIteratorFieldIndex);
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if (position !== -1) {
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var string = @getStringIteratorInternalField(this, @stringIteratorFieldIteratedString);
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var length = string.length >>> 0;
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if (position >= length)
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@putStringIteratorInternalField(this, @stringIteratorFieldIndex, -1);
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else {
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done = false;
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var first = string.@charCodeAt(position);
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if (first < 0xD800 || first > 0xDBFF || position + 1 === length)
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value = string[position];
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else {
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var second = string.@charCodeAt(position + 1);
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if (second < 0xDC00 || second > 0xDFFF)
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value = string[position];
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else
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value = string[position] + string[position + 1];
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}
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@putStringIteratorInternalField(this, @stringIteratorFieldIndex, position + value.length);
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}
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}
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return { value, done };
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}
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