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/* -*- indent-tabs-mode: nil; js-indent-level: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
/*
* Date: 07 May 2001
*
* SUMMARY: Testing the arguments object
*
* See http://bugzilla.mozilla.org/show_bug.cgi?id=72884
*/
//-----------------------------------------------------------------------------
var UBound = 0;
var BUGNUMBER = 72884;
var summary = 'Testing the arguments object';
var status = '';
var statusitems = [ ];
var actual = '';
var actualvalues = [ ];
var expect= '';
var expectedvalues = [ ];
var a = '';
status = inSection(1);
function f()
{
delete arguments.length;
return arguments;
}
a = f();
actual = a instanceof Object;
expect = true;
addThis();
actual = a instanceof Array;
expect = false;
addThis();
actual = a.length;
expect = undefined;
addThis();
status = inSection(2);
a = f(1,2,3);
actual = a instanceof Object;
expect = true;
addThis();
actual = a instanceof Array;
expect = false;
addThis();
actual = a.length;
expect = undefined;
addThis();
actual = a[0];
expect = 1;
addThis();
actual = a[1];
expect = 2;
addThis();
actual = a[2];
expect = 3;
addThis();
status = inSection(3);
/*
* Brendan:
*
* Note that only callee and length can be overridden, so deleting an indexed
* property and asking for it again causes it to be recreated by args_resolve:
*
* function g(){delete arguments[0]; return arguments[0]}
* g(42) // should this print 42?
*
* I'm not positive this violates ECMA, which allows in chapter 16 for extensions
* including properties (does it allow for magically reappearing properties?). The
* delete operator successfully deletes arguments[0] and results in true, but that
* is not distinguishable from the case where arguments[0] was delegated to
* Arguments.prototype[0], which was how the bad old code worked.
*
* I'll ponder this last detail...
*
* UPDATE: Per ECMA-262, delete on an arguments[i] should succeed
* and remove that property from the arguments object, leaving any get
* of it after the delete to evaluate to undefined.
*/
function g()
{
delete arguments[0];
return arguments[0];
}
actual = g(42);
expect = undefined; // not 42...
addThis();
//-------------------------------------------------------------------------------------------------
test();
//-------------------------------------------------------------------------------------------------
function addThis()
{
statusitems[UBound] = status;
actualvalues[UBound] = actual;
expectedvalues[UBound] = expect;
UBound++;
}
function test()
{
enterFunc ('test');
printBugNumber(BUGNUMBER);
printStatus (summary);
for (var i = 0; i < UBound; i++)
{
reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
}
exitFunc ('test');
}
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