зеркало из https://github.com/mozilla/gecko-dev.git
149 строки
3.4 KiB
JavaScript
149 строки
3.4 KiB
JavaScript
/*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s): brendan@mozilla.org, pschwartau@netscape.com
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* Date: 07 May 2001
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*
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* SUMMARY: Testing the arguments object
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*
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* See http://bugzilla.mozilla.org/show_bug.cgi?id=72884
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*/
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//-------------------------------------------------------------------------------------------------
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var UBound = 0;
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var bug = 72884;
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var summary = 'Testing the arguments object';
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var status = '';
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var statusitems = [ ];
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var actual = '';
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var actualvalues = [ ];
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var expect= '';
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var expectedvalues = [ ];
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var a = '';
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status = 'Section A of test';
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function f()
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{
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delete arguments.length;
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return arguments;
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}
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a = f();
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actual = a instanceof Object;
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expect = true;
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addThis();
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actual = a instanceof Array;
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expect = false;
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addThis();
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actual = a.length;
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expect = undefined;
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addThis();
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status = 'Section B of test';
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a = f(1,2,3);
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actual = a instanceof Object;
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expect = true;
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addThis();
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actual = a instanceof Array;
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expect = false;
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addThis();
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actual = a.length;
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expect = undefined;
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addThis();
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actual = a[0];
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expect = 1;
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addThis();
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actual = a[1];
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expect = 2;
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addThis();
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actual = a[2];
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expect = 3;
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addThis();
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status = 'Section C of test';
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/*
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* Brendan:
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*
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* Note that only callee and length can be overridden, so deleting an indexed
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* property and asking for it again causes it to be recreated by args_resolve:
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*
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* function g(){delete arguments[0]; return arguments[0]}
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* g(42) // should this print 42?
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*
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* I'm not positive this violates ECMA, which allows in chapter 16 for extensions
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* including properties (does it allow for magically reappearing properties?). The
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* delete operator successfully deletes arguments[0] and results in true, but that
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* is not distinguishable from the case where arguments[0] was delegated to
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* Arguments.prototype[0], which was how the bad old code worked.
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*
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* I'll ponder this last detail...
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*
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* UPDATE: Per ECMA-262, delete on an arguments[i] should succeed
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* and remove that property from the arguments object, leaving any get
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* of it after the delete to evaluate to undefined.
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*/
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function g()
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{
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delete arguments[0];
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return arguments[0];
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}
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actual = g(42);
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expect = undefined; // not 42...
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addThis();
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//-------------------------------------------------------------------------------------------------
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test();
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//-------------------------------------------------------------------------------------------------
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function addThis()
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{
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statusitems[UBound] = status;
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actualvalues[UBound] = actual;
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expectedvalues[UBound] = expect;
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UBound++;
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}
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function test()
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{
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enterFunc ('test');
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printBugNumber (bug);
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printStatus (summary);
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for (var i = 0; i < UBound; i++)
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{
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reportCompare(expectedvalues[i], actualvalues[i], statusitems[i]);
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}
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exitFunc ('test');
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}
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