/* -*- 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 = newFunction();
/* * 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();
/* * 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();
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