js/src/tests/ecma_3/Function/arguments-001.js@6474c204b198 (annotated)
js/src/tests/ecma_3/Function/arguments-001.js
Wed, 31 Dec 2014 06:09:35 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Wed, 31 Dec 2014 06:09:35 +0100
- changeset 0
- 6474c204b198
- permissions
- -rw-r--r--
Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.
| michael@0 | 1 | /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ |
| michael@0 | 2 | /* This Source Code Form is subject to the terms of the Mozilla Public |
| michael@0 | 3 | * License, v. 2.0. If a copy of the MPL was not distributed with this |
| michael@0 | 4 | * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| michael@0 | 5 | |
| michael@0 | 6 | /* |
| michael@0 | 7 | * Date: 07 May 2001 |
| michael@0 | 8 | * |
| michael@0 | 9 | * SUMMARY: Testing the arguments object |
| michael@0 | 10 | * |
| michael@0 | 11 | * See http://bugzilla.mozilla.org/show_bug.cgi?id=72884 |
| michael@0 | 12 | */ |
| michael@0 | 13 | //----------------------------------------------------------------------------- |
| michael@0 | 14 | var UBound = 0; |
| michael@0 | 15 | var BUGNUMBER = 72884; |
| michael@0 | 16 | var summary = 'Testing the arguments object'; |
| michael@0 | 17 | var status = ''; |
| michael@0 | 18 | var statusitems = [ ]; |
| michael@0 | 19 | var actual = ''; |
| michael@0 | 20 | var actualvalues = [ ]; |
| michael@0 | 21 | var expect= ''; |
| michael@0 | 22 | var expectedvalues = [ ]; |
| michael@0 | 23 | var a = ''; |
| michael@0 | 24 | |
| michael@0 | 25 | |
| michael@0 | 26 | status = inSection(1); |
| michael@0 | 27 | function f() |
| michael@0 | 28 | { |
| michael@0 | 29 | delete arguments.length; |
| michael@0 | 30 | return arguments; |
| michael@0 | 31 | } |
| michael@0 | 32 | |
| michael@0 | 33 | a = f(); |
| michael@0 | 34 | actual = a instanceof Object; |
| michael@0 | 35 | expect = true; |
| michael@0 | 36 | addThis(); |
| michael@0 | 37 | |
| michael@0 | 38 | actual = a instanceof Array; |
| michael@0 | 39 | expect = false; |
| michael@0 | 40 | addThis(); |
| michael@0 | 41 | |
| michael@0 | 42 | actual = a.length; |
| michael@0 | 43 | expect = undefined; |
| michael@0 | 44 | addThis(); |
| michael@0 | 45 | |
| michael@0 | 46 | |
| michael@0 | 47 | |
| michael@0 | 48 | status = inSection(2); |
| michael@0 | 49 | a = f(1,2,3); |
| michael@0 | 50 | actual = a instanceof Object; |
| michael@0 | 51 | expect = true; |
| michael@0 | 52 | addThis(); |
| michael@0 | 53 | |
| michael@0 | 54 | actual = a instanceof Array; |
| michael@0 | 55 | expect = false; |
| michael@0 | 56 | addThis(); |
| michael@0 | 57 | |
| michael@0 | 58 | actual = a.length; |
| michael@0 | 59 | expect = undefined; |
| michael@0 | 60 | addThis(); |
| michael@0 | 61 | |
| michael@0 | 62 | actual = a[0]; |
| michael@0 | 63 | expect = 1; |
| michael@0 | 64 | addThis(); |
| michael@0 | 65 | |
| michael@0 | 66 | actual = a[1]; |
| michael@0 | 67 | expect = 2; |
| michael@0 | 68 | addThis(); |
| michael@0 | 69 | |
| michael@0 | 70 | actual = a[2]; |
| michael@0 | 71 | expect = 3; |
| michael@0 | 72 | addThis(); |
| michael@0 | 73 | |
| michael@0 | 74 | |
| michael@0 | 75 | |
| michael@0 | 76 | status = inSection(3); |
| michael@0 | 77 | /* |
| michael@0 | 78 | * Brendan: |
| michael@0 | 79 | * |
| michael@0 | 80 | * Note that only callee and length can be overridden, so deleting an indexed |
| michael@0 | 81 | * property and asking for it again causes it to be recreated by args_resolve: |
| michael@0 | 82 | * |
| michael@0 | 83 | * function g(){delete arguments[0]; return arguments[0]} |
| michael@0 | 84 | * g(42) // should this print 42? |
| michael@0 | 85 | * |
| michael@0 | 86 | * I'm not positive this violates ECMA, which allows in chapter 16 for extensions |
| michael@0 | 87 | * including properties (does it allow for magically reappearing properties?). The |
| michael@0 | 88 | * delete operator successfully deletes arguments[0] and results in true, but that |
| michael@0 | 89 | * is not distinguishable from the case where arguments[0] was delegated to |
| michael@0 | 90 | * Arguments.prototype[0], which was how the bad old code worked. |
| michael@0 | 91 | * |
| michael@0 | 92 | * I'll ponder this last detail... |
| michael@0 | 93 | * |
| michael@0 | 94 | * UPDATE: Per ECMA-262, delete on an arguments[i] should succeed |
| michael@0 | 95 | * and remove that property from the arguments object, leaving any get |
| michael@0 | 96 | * of it after the delete to evaluate to undefined. |
| michael@0 | 97 | */ |
| michael@0 | 98 | function g() |
| michael@0 | 99 | { |
| michael@0 | 100 | delete arguments[0]; |
| michael@0 | 101 | return arguments[0]; |
| michael@0 | 102 | } |
| michael@0 | 103 | actual = g(42); |
| michael@0 | 104 | expect = undefined; // not 42... |
| michael@0 | 105 | addThis(); |
| michael@0 | 106 | |
| michael@0 | 107 | |
| michael@0 | 108 | |
| michael@0 | 109 | //------------------------------------------------------------------------------------------------- |
| michael@0 | 110 | test(); |
| michael@0 | 111 | //------------------------------------------------------------------------------------------------- |
| michael@0 | 112 | |
| michael@0 | 113 | |
| michael@0 | 114 | function addThis() |
| michael@0 | 115 | { |
| michael@0 | 116 | statusitems[UBound] = status; |
| michael@0 | 117 | actualvalues[UBound] = actual; |
| michael@0 | 118 | expectedvalues[UBound] = expect; |
| michael@0 | 119 | UBound++; |
| michael@0 | 120 | } |
| michael@0 | 121 | |
| michael@0 | 122 | |
| michael@0 | 123 | function test() |
| michael@0 | 124 | { |
| michael@0 | 125 | enterFunc ('test'); |
| michael@0 | 126 | printBugNumber(BUGNUMBER); |
| michael@0 | 127 | printStatus (summary); |
| michael@0 | 128 | |
| michael@0 | 129 | for (var i = 0; i < UBound; i++) |
| michael@0 | 130 | { |
| michael@0 | 131 | reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]); |
| michael@0 | 132 | } |
| michael@0 | 133 | |
| michael@0 | 134 | exitFunc ('test'); |
| michael@0 | 135 | } |
