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      1 /* ***** BEGIN LICENSE BLOCK *****
      2 * Version: NPL 1.1/GPL 2.0/LGPL 2.1
      3 *
      4 * The contents of this file are subject to the Netscape Public License
      5 * Version 1.1 (the "License"); you may not use this file except in
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      9 * Software distributed under the License is distributed on an "AS IS" basis,
     10 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
     11 * for the specific language governing rights and limitations under the
     12 * License.
     13 *
     14 * The Original Code is JavaScript Engine testing utilities.
     15 *
     16 * The Initial Developer of the Original Code is Netscape Communications Corp.
     17 * Portions created by the Initial Developer are Copyright (C) 2003
     18 * the Initial Developer. All Rights Reserved.
     19 *
     20 * Contributor(s): igor (at) icesoft.no, pschwartau (at) netscape.com
     21 *
     22 * Alternatively, the contents of this file may be used under the terms of
     23 * either the GNU General Public License Version 2 or later (the "GPL"), or
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     25 * in which case the provisions of the GPL or the LGPL are applicable instead
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     31 * the provisions above, a recipient may use your version of this file under
     32 * the terms of any one of the NPL, the GPL or the LGPL.
     33 *
     34 * ***** END LICENSE BLOCK *****
     35 *
     36 *
     37 * Date:    06 February 2003
     38 * SUMMARY: Using |instanceof| to check if function is called as a constructor
     39 *
     40 * See http://bugzilla.mozilla.org/show_bug.cgi?id=192105
     41 *
     42 */
     43 //-----------------------------------------------------------------------------
     44 var UBound = 0;
     45 var bug = 192105;
     46 var summary = 'Using |instanceof| to check if f() is called as constructor';
     47 var status = '';
     48 var statusitems = [];
     49 var actual = '';
     50 var actualvalues = [];
     51 var expect= '';
     52 var expectedvalues = [];
     53 
     54 
     55 /*
     56  * This function is the heart of the test. It sets the result
     57  * variable |actual|, which we will compare against |expect|.
     58  *
     59  * Note |actual| will be set to |true| or |false| according
     60  * to whether or not this function is called as a constructor;
     61  * i.e. whether it is called via the |new| keyword or not -
     62  */
     63 function f()
     64 {
     65   actual = (this instanceof f);
     66 }
     67 
     68 
     69 /*
     70  * Call f as a constructor from global scope
     71  */
     72 status = inSection(1);
     73 new f(); // sets |actual|
     74 expect = true;
     75 addThis();
     76 
     77 /*
     78  * Now, not as a constructor
     79  */
     80 status = inSection(2);
     81 f(); // sets |actual|
     82 expect = false;
     83 addThis();
     84 
     85 
     86 /*
     87  * Call f as a constructor from function scope
     88  */
     89 function F()
     90 {
     91   new f();
     92 }
     93 status = inSection(3);
     94 F(); // sets |actual|
     95 expect = true;
     96 addThis();
     97 
     98 /*
     99  * Now, not as a constructor
    100  */
    101 function G()
    102 {
    103   f();
    104 }
    105 status = inSection(4);
    106 G(); // sets |actual|
    107 expect = false;
    108 addThis();
    109 
    110 
    111 /*
    112  * Now make F() and G() methods of an object
    113  */
    114 var obj = {F:F, G:G};
    115 status = inSection(5);
    116 obj.F(); // sets |actual|
    117 expect = true;
    118 addThis();
    119 
    120 status = inSection(6);
    121 obj.G(); // sets |actual|
    122 expect = false;
    123 addThis();
    124 
    125 
    126 /*
    127  * Now call F() and G() from yet other functions, and use eval()
    128  */
    129 function A()
    130 {
    131   eval('F();');
    132 }
    133 status = inSection(7);
    134 A(); // sets |actual|
    135 expect = true;
    136 addThis();
    137 
    138 
    139 function B()
    140 {
    141   eval('G();');
    142 }
    143 status = inSection(8);
    144 B(); // sets |actual|
    145 expect = false;
    146 addThis();
    147 
    148 
    149 
    150 
    151 //-----------------------------------------------------------------------------
    152 test();
    153 //-----------------------------------------------------------------------------
    154 
    155 
    156 
    157 function addThis()
    158 {
    159   statusitems[UBound] = status;
    160   actualvalues[UBound] = actual;
    161   expectedvalues[UBound] = expect;
    162   UBound++;
    163 }
    164 
    165 
    166 function test()
    167 {
    168   enterFunc('test');
    169   printBugNumber(bug);
    170   printStatus(summary);
    171 
    172   for (var i=0; i<UBound; i++)
    173   {
    174     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
    175   }
    176 
    177   exitFunc ('test');
    178 }
    179