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