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:  *
michael@0:  * Date:    06 February 2003
michael@0:  * SUMMARY: Using |instanceof| to check if function is called as a constructor
michael@0:  *
michael@0:  * See http://bugzilla.mozilla.org/show_bug.cgi?id=192105
michael@0:  *
michael@0:  */
michael@0: //-----------------------------------------------------------------------------
michael@0: var UBound = 0;
michael@0: var BUGNUMBER = 192105;
michael@0: var summary = 'Using |instanceof| to check if f() is called as constructor';
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: 
michael@0: 
michael@0: /*
michael@0:  * This function is the heart of the test. It sets the result
michael@0:  * variable |actual|, which we will compare against |expect|.
michael@0:  *
michael@0:  * Note |actual| will be set to |true| or |false| according
michael@0:  * to whether or not this function is called as a constructor;
michael@0:  * i.e. whether it is called via the |new| keyword or not -
michael@0:  */
michael@0: function f()
michael@0: {
michael@0:   actual = (this instanceof f);
michael@0: }
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Call f as a constructor from global scope
michael@0:  */
michael@0: status = inSection(1);
michael@0: new f(); // sets |actual|
michael@0: expect = true;
michael@0: addThis();
michael@0: 
michael@0: /*
michael@0:  * Now, not as a constructor
michael@0:  */
michael@0: status = inSection(2);
michael@0: f(); // sets |actual|
michael@0: expect = false;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Call f as a constructor from function scope
michael@0:  */
michael@0: function F()
michael@0: {
michael@0:   new f();
michael@0: }
michael@0: status = inSection(3);
michael@0: F(); // sets |actual|
michael@0: expect = true;
michael@0: addThis();
michael@0: 
michael@0: /*
michael@0:  * Now, not as a constructor
michael@0:  */
michael@0: function G()
michael@0: {
michael@0:   f();
michael@0: }
michael@0: status = inSection(4);
michael@0: G(); // sets |actual|
michael@0: expect = false;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Now make F() and G() methods of an object
michael@0:  */
michael@0: var obj = {F:F, G:G};
michael@0: status = inSection(5);
michael@0: obj.F(); // sets |actual|
michael@0: expect = true;
michael@0: addThis();
michael@0: 
michael@0: status = inSection(6);
michael@0: obj.G(); // sets |actual|
michael@0: expect = false;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: /*
michael@0:  * Now call F() and G() from yet other functions, and use eval()
michael@0:  */
michael@0: function A()
michael@0: {
michael@0:   eval('F();');
michael@0: }
michael@0: status = inSection(7);
michael@0: A(); // sets |actual|
michael@0: expect = true;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: function B()
michael@0: {
michael@0:   eval('G();');
michael@0: }
michael@0: status = inSection(8);
michael@0: B(); // sets |actual|
michael@0: expect = false;
michael@0: addThis();
michael@0: 
michael@0: 
michael@0: 
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: test();
michael@0: //-----------------------------------------------------------------------------
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: }