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: 2001-07-13
michael@0:  *
michael@0:  * SUMMARY: Applying Function.prototype.call to the Function object itself
michael@0:  *
michael@0:  *
michael@0:  * ECMA-262 15.3.4.4 Function.prototype.call (thisArg [,arg1 [,arg2,…] ] )
michael@0:  *
michael@0:  * When applied to the Function object itself, thisArg should be ignored.
michael@0:  * As explained by Waldemar (waldemar@netscape.com):
michael@0:  *
michael@0:  * Function.call(obj, "print(this)") is equivalent to invoking
michael@0:  * Function("print(this)") with this set to obj. Now, Function("print(this)")
michael@0:  * is equivalent to new Function("print(this)") (see 15.3.1.1), and the latter
michael@0:  * ignores the this value that you passed it and constructs a function
michael@0:  * (which we'll call F) which will print the value of the this that will be
michael@0:  * passed in when F will be invoked.
michael@0:  *
michael@0:  * With the last set of () you're invoking F(), which means you're calling it
michael@0:  * with no this value. When you don't provide a this value, it defaults to the
michael@0:  * global object.
michael@0:  *
michael@0:  */
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: var UBound = 0;
michael@0: var BUGNUMBER = '(none)';
michael@0: var summary = 'Applying Function.prototype.call to the Function object itself';
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 self = this; // capture a reference to the global object
michael@0: var cnOBJECT_GLOBAL = self.toString();
michael@0: var cnOBJECT_OBJECT = (new Object).toString();
michael@0: var cnHello = 'Hello';
michael@0: var cnRed = 'red';
michael@0: var objTEST = {color:cnRed};
michael@0: var f = new Function();
michael@0: var g = new Function();
michael@0: 
michael@0: 
michael@0: f = Function.call(self, 'return cnHello');
michael@0: g = Function.call(objTEST, 'return cnHello');
michael@0: 
michael@0: status = 'Section A of test';
michael@0: actual = f();
michael@0: expect = cnHello;
michael@0: captureThis();
michael@0: 
michael@0: status = 'Section B of test';
michael@0: actual = g();
michael@0: expect = cnHello;
michael@0: captureThis();
michael@0: 
michael@0: 
michael@0: f = Function.call(self, 'return this.toString()');
michael@0: g = Function.call(objTEST, 'return this.toString()');
michael@0: 
michael@0: status = 'Section C of test';
michael@0: actual = f();
michael@0: expect = cnOBJECT_GLOBAL;
michael@0: captureThis();
michael@0: 
michael@0: status = 'Section D of test';
michael@0: actual = g();
michael@0: expect = cnOBJECT_GLOBAL;
michael@0: captureThis();
michael@0: 
michael@0: 
michael@0: f = Function.call(self, 'return this.color');
michael@0: g = Function.call(objTEST, 'return this.color');
michael@0: 
michael@0: status = 'Section E of test';
michael@0: actual = f();
michael@0: expect = undefined;
michael@0: captureThis();
michael@0: 
michael@0: status = 'Section F of test';
michael@0: actual = g();
michael@0: expect = undefined;
michael@0: captureThis();
michael@0: 
michael@0: 
michael@0: 
michael@0: //-----------------------------------------------------------------------------
michael@0: test();
michael@0: //-----------------------------------------------------------------------------
michael@0: 
michael@0: 
michael@0: function captureThis()
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: }