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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: 25 Mar 2002
* SUMMARY: Array.prototype.sort() should not (re-)define .length
* See http://bugzilla.mozilla.org/show_bug.cgi?id=130451
*
* From the ECMA-262 Edition 3 Final spec:
*
* NOTE: The sort function is intentionally generic; it does not require that
* its |this| value be an Array object. Therefore, it can be transferred to
* other kinds of objects for use as a method. Whether the sort function can
* be applied successfully to a host object is implementation-dependent.
*
* The interesting parts of this testcase are the contrasting expectations for
* Brendan's test below, when applied to Array objects vs. non-Array objects.
*
*/
//-----------------------------------------------------------------------------
var UBound = 0;
var BUGNUMBER = 130451;
var summary = 'Array.prototype.sort() should not (re-)define .length';
var status = '';
var statusitems = [];
var actual = '';
var actualvalues = [];
var expect= '';
var expectedvalues = [];
var arr = [];
var cmp = new Function();
/*
* First: test Array.prototype.sort() on Array objects
*/
status = inSection(1);
arr = [0,1,2,3];
cmp = function(x,y) {return x-y;};
actual = arr.sort(cmp).length;
expect = 4;
addThis();
status = inSection(2);
arr = [0,1,2,3];
cmp = function(x,y) {return y-x;};
actual = arr.sort(cmp).length;
expect = 4;
addThis();
status = inSection(3);
arr = [0,1,2,3];
cmp = function(x,y) {return x-y;};
arr.length = 1;
actual = arr.sort(cmp).length;
expect = 1;
addThis();
/*
* This test is by Brendan. Setting arr.length to
* 2 and then 4 should cause elements to be deleted.
*/
arr = [0,1,2,3];
cmp = function(x,y) {return x-y;};
arr.sort(cmp);
status = inSection(4);
actual = arr.join();
expect = '0,1,2,3';
addThis();
status = inSection(5);
actual = arr.length;
expect = 4;
addThis();
status = inSection(6);
arr.length = 2;
actual = arr.join();
expect = '0,1';
addThis();
status = inSection(7);
arr.length = 4;
actual = arr.join();
expect = '0,1,,'; //<---- see how 2,3 have been lost
addThis();
/*
* Now test Array.prototype.sort() on non-Array objects
*/
status = inSection(8);
var obj = new Object();
obj.sort = Array.prototype.sort;
obj.length = 4;
obj[0] = 0;
obj[1] = 1;
obj[2] = 2;
obj[3] = 3;
cmp = function(x,y) {return x-y;};
actual = obj.sort(cmp).length;
expect = 4;
addThis();
/*
* Here again is Brendan's test. Unlike the array case
* above, the setting of obj.length to 2 and then 4
* should NOT cause elements to be deleted
*/
obj = new Object();
obj.sort = Array.prototype.sort;
obj.length = 4;
obj[0] = 3;
obj[1] = 2;
obj[2] = 1;
obj[3] = 0;
cmp = function(x,y) {return x-y;};
obj.sort(cmp); //<---- this is what triggered the buggy behavior below
obj.join = Array.prototype.join;
status = inSection(9);
actual = obj.join();
expect = '0,1,2,3';
addThis();
status = inSection(10);
actual = obj.length;
expect = 4;
addThis();
status = inSection(11);
obj.length = 2;
actual = obj.join();
expect = '0,1';
addThis();
/*
* Before this bug was fixed, |actual| held the value '0,1,,'
* as in the Array-object case at top. This bug only occurred
* if Array.prototype.sort() had been applied to |obj|,
* as we have done higher up.
*/
status = inSection(12);
obj.length = 4;
actual = obj.join();
expect = '0,1,2,3';
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');
}
|
