| /* |
| * 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 (@isUndefinedOrNull(this)) |
| @throwTypeError("%StringIteratorPrototype%.next requires that |this| not be null or undefined"); |
| |
| var position = @getByIdDirectPrivate(this, "stringIteratorNextIndex"); |
| if (position === @undefined) |
| @throwTypeError("%StringIteratorPrototype%.next requires that |this| be a String Iterator instance"); |
| |
| var done = true; |
| var value = @undefined; |
| |
| var string = @getByIdDirectPrivate(this, "iteratedString"); |
| if (string !== @undefined) { |
| var length = string.length >>> 0; |
| if (position >= length) |
| @putByIdDirectPrivate(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]; |
| } |
| |
| @putByIdDirectPrivate(this, "stringIteratorNextIndex", position + value.length); |
| } |
| } |
| |
| return { value, done }; |
| } |