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| |
| /* |
| * Date: 2001-07-13 |
| * |
| * SUMMARY: Applying Function.prototype.call to the Function object itself |
| * |
| * |
| * ECMA-262 15.3.4.4 Function.prototype.call (thisArg [,arg1 [,arg2,
] ] ) |
| * |
| * When applied to the Function object itself, thisArg should be ignored. |
| * As explained by Waldemar (waldemar@netscape.com): |
| * |
| * Function.call(obj, "print(this)") is equivalent to invoking |
| * Function("print(this)") with this set to obj. Now, Function("print(this)") |
| * is equivalent to new Function("print(this)") (see 15.3.1.1), and the latter |
| * ignores the this value that you passed it and constructs a function |
| * (which we'll call F) which will print the value of the this that will be |
| * passed in when F will be invoked. |
| * |
| * With the last set of () you're invoking F(), which means you're calling it |
| * with no this value. When you don't provide a this value, it defaults to the |
| * global object. |
| * |
| */ |
| |
| //----------------------------------------------------------------------------- |
| var gTestfile = 'call-001.js'; |
| var UBound = 0; |
| var BUGNUMBER = '(none)'; |
| var summary = 'Applying Function.prototype.call to the Function object itself'; |
| var status = ''; |
| var statusitems = []; |
| var actual = ''; |
| var actualvalues = []; |
| var expect= ''; |
| var expectedvalues = []; |
| var self = this; // capture a reference to the global object |
| var cnOBJECT_GLOBAL = self.toString(); |
| var cnOBJECT_OBJECT = (new Object).toString(); |
| var cnHello = 'Hello'; |
| var cnRed = 'red'; |
| var objTEST = {color:cnRed}; |
| var f = new Function(); |
| var g = new Function(); |
| |
| |
| f = Function.call(self, 'return cnHello'); |
| g = Function.call(objTEST, 'return cnHello'); |
| |
| status = 'Section A of test'; |
| actual = f(); |
| expect = cnHello; |
| captureThis(); |
| |
| status = 'Section B of test'; |
| actual = g(); |
| expect = cnHello; |
| captureThis(); |
| |
| |
| f = Function.call(self, 'return this.toString()'); |
| g = Function.call(objTEST, 'return this.toString()'); |
| |
| status = 'Section C of test'; |
| actual = f(); |
| expect = cnOBJECT_GLOBAL; |
| captureThis(); |
| |
| status = 'Section D of test'; |
| actual = g(); |
| expect = cnOBJECT_GLOBAL; |
| captureThis(); |
| |
| |
| f = Function.call(self, 'return this.color'); |
| g = Function.call(objTEST, 'return this.color'); |
| |
| status = 'Section E of test'; |
| actual = f(); |
| expect = undefined; |
| captureThis(); |
| |
| status = 'Section F of test'; |
| actual = g(); |
| expect = undefined; |
| captureThis(); |
| |
| |
| |
| //----------------------------------------------------------------------------- |
| test(); |
| //----------------------------------------------------------------------------- |
| |
| |
| function captureThis() |
| { |
| 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'); |
| } |