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// Copyright 2013 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// '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 THE COPYRIGHT
// OWNER 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.
'use strict';
// This file relies on the fact that the following declaration has been made
// in runtime.js:
// var $Array = global.Array;
var ARRAY_ITERATOR_KIND_KEYS = 1;
var ARRAY_ITERATOR_KIND_VALUES = 2;
var ARRAY_ITERATOR_KIND_ENTRIES = 3;
// The spec draft also has "sparse" but it is never used.
var iteratorObjectSymbol = %CreateSymbol(UNDEFINED);
var arrayIteratorNextIndexSymbol = %CreateSymbol(UNDEFINED);
var arrayIterationKindSymbol = %CreateSymbol(UNDEFINED);
function ArrayIterator() {}
// 15.4.5.1 CreateArrayIterator Abstract Operation
function CreateArrayIterator(array, kind) {
var object = ToObject(array);
var iterator = new ArrayIterator;
iterator[iteratorObjectSymbol] = object;
iterator[arrayIteratorNextIndexSymbol] = 0;
iterator[arrayIterationKindSymbol] = kind;
return iterator;
}
// 15.19.4.3.4 CreateItrResultObject
function CreateIteratorResultObject(value, done) {
return {value: value, done: done};
}
// 15.4.5.2.2 ArrayIterator.prototype.next( )
function ArrayIteratorNext() {
var iterator = ToObject(this);
var array = iterator[iteratorObjectSymbol];
if (!array) {
throw MakeTypeError('incompatible_method_receiver',
['Array Iterator.prototype.next']);
}
var index = iterator[arrayIteratorNextIndexSymbol];
var itemKind = iterator[arrayIterationKindSymbol];
var length = TO_UINT32(array.length);
// "sparse" is never used.
if (index >= length) {
iterator[arrayIteratorNextIndexSymbol] = 1 / 0; // Infinity
return CreateIteratorResultObject(UNDEFINED, true);
}
iterator[arrayIteratorNextIndexSymbol] = index + 1;
if (itemKind == ARRAY_ITERATOR_KIND_VALUES)
return CreateIteratorResultObject(array[index], false);
if (itemKind == ARRAY_ITERATOR_KIND_ENTRIES)
return CreateIteratorResultObject([index, array[index]], false);
return CreateIteratorResultObject(index, false);
}
function ArrayEntries() {
return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_ENTRIES);
}
function ArrayValues() {
return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_VALUES);
}
function ArrayKeys() {
return CreateArrayIterator(this, ARRAY_ITERATOR_KIND_KEYS);
}
function SetUpArrayIterator() {
%CheckIsBootstrapping();
%FunctionSetInstanceClassName(ArrayIterator, 'Array Iterator');
%FunctionSetReadOnlyPrototype(ArrayIterator);
InstallFunctions(ArrayIterator.prototype, DONT_ENUM, $Array(
'next', ArrayIteratorNext
));
}
SetUpArrayIterator();
function ExtendArrayPrototype() {
%CheckIsBootstrapping();
InstallFunctions($Array.prototype, DONT_ENUM, $Array(
'entries', ArrayEntries,
'values', ArrayValues,
'keys', ArrayKeys
));
}
ExtendArrayPrototype();
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