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ArrayIteratorPrototype.js
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70 lines (62 loc) · 2.94 KB
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/*
* Copyright (C) 2015 Yusuke Suzuki <utatane.tea@gmail.com>.
* Copyright (C) 2016 Apple Inc. All rights reserved.
*
* 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 (!@isArrayIterator(this))
@throwTypeError("%ArrayIteratorPrototype%.next requires that |this| be an Array Iterator instance");
var index = @getArrayIteratorInternalField(this, @arrayIteratorFieldIndex);
if (index === -1)
return { value: @undefined, done: true };
var array = @getArrayIteratorInternalField(this, @arrayIteratorFieldIteratedObject);
if (@isTypedArrayView(array) && @isDetached(array))
@throwTypeError("Underlying ArrayBuffer has been detached from the view or out-of-bounds");
var kind = @getArrayIteratorInternalField(this, @arrayIteratorFieldKind);
return @arrayIteratorNextHelper.@call(this, array, kind, index);
}
// FIXME: We have to have this because we can't implement this all as one function and meet our inlining heuristics.
// Collectively, next and this have ~130 bytes of bytecodes but our limit is 120.
@linkTimeConstant
function arrayIteratorNextHelper(array, kind, index)
{
"use strict";
var done = true;
var value;
var length = @isTypedArrayView(array) ? @typedArrayLength(array) : @toLength(array.length);
if (index < length) {
@putArrayIteratorInternalField(this, @arrayIteratorFieldIndex, index + 1);
done = false;
if (kind === @iterationKindKey)
value = index;
else {
value = array[index];
if (kind === @iterationKindEntries)
value = [index, value];
}
} else
@putArrayIteratorInternalField(this, @arrayIteratorFieldIndex, -1);
return { value, done };
}