gecko/js/tests/ecma_3/Object/shell.js

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
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*
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*
* The Original Code is mozilla.org code.
*
* The Initial Developer of the Original Code is
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* Portions created by the Initial Developer are Copyright (C) 1998
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*
* Contributor(s):
* pschwartau@netscape.com
*
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/*
* Date: 14 Mar 2001
*
* SUMMARY: Utility functions for testing objects -
*
* Suppose obj is an instance of a native type, e.g. Number.
* Then obj.toString() invokes Number.prototype.toString().
* We would also like to access Object.prototype.toString().
*
* The difference is this: suppose obj = new Number(7).
* Invoking Number.prototype.toString() on this just returns 7.
* Object.prototype.toString() on this returns '[object Number]'.
*
* The getJSType() function below will return '[object Number]' for us.
* The getJSClass() function returns 'Number', the [[Class]] property of obj.
* See ECMA-262 Edition 3, 13-Oct-1999, Section 8.6.2
*/
//-----------------------------------------------------------------------------
gTestsubsuite = 'Object';
var cnNoObject = 'Unexpected Error!!! Parameter to this function must be an object';
var cnNoClass = 'Unexpected Error!!! Cannot find Class property';
var cnObjectToString = Object.prototype.toString;
var GLOBAL = 'global';
// checks that it's safe to call findType()
function getJSType(obj)
{
if (isObject(obj))
return findType(obj);
return cnNoObject;
}
// checks that it's safe to call findType()
function getJSClass(obj)
{
if (isObject(obj))
return findClass(findType(obj));
return cnNoObject;
}
function findType(obj)
{
return cnObjectToString.apply(obj);
}
// given '[object Number]', return 'Number'
function findClass(sType)
{
var re = /^\[.*\s+(\w+)\s*\]$/;
var a = sType.match(re);
if (a && a[1])
return a[1];
return cnNoClass;
}
function isObject(obj)
{
return obj instanceof Object;
}