tests/mozilla/js1_5/Object/regress-192105.js

   1 /* ***** BEGIN LICENSE BLOCK *****
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  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@icesoft.no, pschwartau@netscape.com
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  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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  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 }