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106 lines
3.3 KiB
JavaScript
106 lines
3.3 KiB
JavaScript
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* 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
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* pschwartau@netscape.com
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/*
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* Date: 14 Mar 2001
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*
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* SUMMARY: Utility functions for testing objects -
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*
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* Suppose obj is an instance of a native type, e.g. Number.
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* Then obj.toString() invokes Number.prototype.toString().
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* We would also like to access Object.prototype.toString().
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*
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* The difference is this: suppose obj = new Number(7).
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* Invoking Number.prototype.toString() on this just returns 7.
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* Object.prototype.toString() on this returns '[object Number]'.
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*
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* The getJSType() function below will return '[object Number]' for us.
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* The getJSClass() function returns 'Number', the [[Class]] property of obj.
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* See ECMA-262 Edition 3, 13-Oct-1999, Section 8.6.2
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*/
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//-----------------------------------------------------------------------------
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gTestsubsuite = 'Object';
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var cnNoObject = 'Unexpected Error!!! Parameter to this function must be an object';
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var cnNoClass = 'Unexpected Error!!! Cannot find Class property';
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var cnObjectToString = Object.prototype.toString;
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var GLOBAL = 'global';
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// checks that it's safe to call findType()
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function getJSType(obj)
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{
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if (isObject(obj))
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return findType(obj);
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return cnNoObject;
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}
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// checks that it's safe to call findType()
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function getJSClass(obj)
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{
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if (isObject(obj))
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return findClass(findType(obj));
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return cnNoObject;
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}
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function findType(obj)
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{
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return cnObjectToString.apply(obj);
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}
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// given '[object Number]', return 'Number'
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function findClass(sType)
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{
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var re = /^\[.*\s+(\w+)\s*\]$/;
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var a = sType.match(re);
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if (a && a[1])
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return a[1];
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return cnNoClass;
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}
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function isObject(obj)
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{
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return obj instanceof Object;
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}
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