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