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Copy pathStringIteratorPrototype.js
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64 lines (56 loc) · 2.51 KB
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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
function next()
{
"use strict";
if (this == null)
throw new @TypeError("%StringIteratorPrototype%.next requires that |this| not be null or undefined");
var position = this.@stringIteratorNextIndex;
if (position === @undefined)
throw new @TypeError("%StringIteratorPrototype%.next requires that |this| be a String Iterator instance");
var done = true;
var value = @undefined;
var string = this.@iteratedString;
if (string !== @undefined) {
var length = string.length >>> 0;
if (position >= length) {
this.@iteratedString = @undefined;
} else {
done = false;
var first = string.@charCodeAt(position);
if (first < 0xD800 || first > 0xDBFF || position + 1 === length)
value = string[position];
else {
var second = string.@charCodeAt(position + 1);
if (second < 0xDC00 || second > 0xDFFF)
value = string[position];
else
value = string[position] + string[position + 1];
}
this.@stringIteratorNextIndex = position + value.length;
}
}
return {done, value};
}