The Tor Browser: js/src/tests/ecma_3/Function/arguments-001.js@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 /*

     7  * Date: 07 May 2001

     8  *

     9  * SUMMARY:  Testing the arguments object

    10  *

    11  * See http://bugzilla.mozilla.org/show_bug.cgi?id=72884

    12  */

    13 //-----------------------------------------------------------------------------

    14 var UBound = 0;

    15 var BUGNUMBER = 72884;

    16 var summary = 'Testing the arguments object';

    17 var status = '';

    18 var statusitems = [ ];

    19 var actual = '';

    20 var actualvalues = [ ];

    21 var expect= '';

    22 var expectedvalues = [ ];

    23 var a = '';

    26 status = inSection(1);

    27 function f()

    28 {

    29   delete arguments.length;

    30   return arguments;

    31 }

    33 a = f();

    34 actual = a instanceof Object;

    35 expect = true;

    36 addThis();

    38 actual = a instanceof Array;

    39 expect = false;

    40 addThis();

    42 actual = a.length;

    43 expect = undefined;

    44 addThis();

    48 status = inSection(2);

    49 a = f(1,2,3);

    50 actual = a instanceof Object;

    51 expect = true;

    52 addThis();

    54 actual = a instanceof Array;

    55 expect = false;

    56 addThis();

    58 actual = a.length;

    59 expect = undefined;

    60 addThis();

    62 actual = a[0];

    63 expect = 1;

    64 addThis();

    66 actual = a[1];

    67 expect = 2;

    68 addThis();

    70 actual = a[2];

    71 expect = 3;

    72 addThis();

    76 status = inSection(3);

    77 /*

    78  * Brendan:

    79  *

    80  * Note that only callee and length can be overridden, so deleting an indexed

    81  * property and asking for it again causes it to be recreated by args_resolve:

    82  *

    83  * function g(){delete arguments[0]; return arguments[0]}

    84  * g(42)     // should this print 42?

    85  *

    86  * I'm not positive this violates ECMA, which allows in chapter 16 for extensions

    87  * including properties (does it allow for magically reappearing properties?).  The

    88  * delete operator successfully deletes arguments[0] and results in true, but that

    89  * is not distinguishable from the case where arguments[0] was delegated to

    90  * Arguments.prototype[0], which was how the bad old code worked.

    91  *

    92  * I'll ponder this last detail...

    93  *

    94  * UPDATE: Per ECMA-262, delete on an arguments[i] should succeed

    95  * and remove that property from the arguments object, leaving any get

    96  * of it after the delete to evaluate to undefined.

    97  */

    98 function g()

    99 {

   100   delete arguments[0];

   101   return arguments[0];

   102 }

   103 actual = g(42);

   104 expect = undefined;  // not 42...

   105 addThis();

   109 //-------------------------------------------------------------------------------------------------

   110 test();

   111 //-------------------------------------------------------------------------------------------------

   114 function addThis()

   115 {

   116   statusitems[UBound] = status;

   117   actualvalues[UBound] = actual;

   118   expectedvalues[UBound] = expect;

   119   UBound++;

   120 }

   123 function test()

   124 {

   125   enterFunc ('test');

   126   printBugNumber(BUGNUMBER);

   127   printStatus (summary);

   129   for (var i = 0; i < UBound; i++)

   130   {

   131     reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);

   132   }

   134   exitFunc ('test');

   135 }

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