1/*
2* The contents of this file are subject to the Netscape Public
3* License Version 1.1 (the "License"); you may not use this file
4* except in compliance with the License. You may obtain a copy of
5* the License at http://www.mozilla.org/NPL/
6*
7* Software distributed under the License is distributed on an
8* "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, either expressed
9* or implied. See the License for the specific language governing
10* rights and limitations under the License.
11*
12* The Original Code is mozilla.org code.
13*
14* The Initial Developer of the Original Code is Netscape
15* Communications Corporation.  Portions created by Netscape are
16* Copyright (C) 1998 Netscape Communications Corporation.
17* All Rights Reserved.
18*
19* Contributor(s): pschwartau@netscape.com
20* Date: 2001-07-13
21*
22* SUMMARY: Applying Function.prototype.call to the Function object itself
23*
24*
25* ECMA-262 15.3.4.4 Function.prototype.call (thisArg [,arg1 [,arg2,�] ] )
26*
27* When applied to the Function object itself, thisArg should be ignored.
28* As explained by Waldemar (waldemar@netscape.com):
29*
30* Function.call(obj, "print(this)") is equivalent to invoking
31* Function("print(this)") with this set to obj. Now, Function("print(this)")
32* is equivalent to new Function("print(this)") (see 15.3.1.1), and the latter
33* ignores the this value that you passed it and constructs a function
34* (which we'll call F) which will print the value of the this that will be
35* passed in when F will be invoked.
36*
37* With the last set of () you're invoking F(), which means you're calling it
38* with no this value. When you don't provide a this value, it defaults to the
39* global object.
40*
41*/
42//-----------------------------------------------------------------------------
43var UBound = 0;
44var bug = '(none)';
45var summary = 'Applying Function.prototype.call to the Function object itself';
46var status = '';
47var statusitems = [];
48var actual = '';
49var actualvalues = [];
50var expect= '';
51var expectedvalues = [];
52var self = this; // capture a reference to the global object
53var cnOBJECT_GLOBAL = self.toString();
54var cnOBJECT_OBJECT = (new Object).toString();
55var cnHello = 'Hello';
56var cnRed = 'red';
57var objTEST = {color:cnRed};
58var f = new Function();
59var g = new Function();
60
61
62f = Function.call(self, 'return cnHello');
63g = Function.call(objTEST, 'return cnHello');
64
65status = 'Section A of test';
66actual = f();
67expect = cnHello;
68captureThis();
69
70status = 'Section B of test';
71actual = g();
72expect = cnHello;
73captureThis();
74
75
76f = Function.call(self, 'return this.toString()');
77g = Function.call(objTEST, 'return this.toString()');
78
79status = 'Section C of test';
80actual = f();
81expect = cnOBJECT_GLOBAL;
82captureThis();
83
84status = 'Section D of test';
85actual = g();
86expect = cnOBJECT_GLOBAL;
87captureThis();
88
89
90f = Function.call(self, 'return this.color');
91g = Function.call(objTEST, 'return this.color');
92
93status = 'Section E of test';
94actual = f();
95expect = undefined;
96captureThis();
97
98status = 'Section F of test';
99actual = g();
100expect = undefined;
101captureThis();
102
103
104
105//-----------------------------------------------------------------------------
106test();
107//-----------------------------------------------------------------------------
108
109
110function captureThis()
111{
112  statusitems[UBound] = status;
113  actualvalues[UBound] = actual;
114  expectedvalues[UBound] = expect;
115  UBound++;
116}
117
118
119function test()
120{
121  enterFunc ('test');
122  printBugNumber (bug);
123  printStatus (summary);
124
125  for (var i = 0; i < UBound; i++)
126  {
127    reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
128  }
129
130  exitFunc ('test');
131}
132