tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
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shell.js (1726B)

      1 /* -*- indent-tabs-mode: nil; js-indent-level: 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/. */
      5 
      6 /*---
      7 defines: [getJSClass, findType, findClass, isObject]
      8 allow_unused: True
      9 ---*/
     10 
     11 /*
     12 * Date: 14 Mar 2001
     13 *
     14 * SUMMARY: Utility functions for testing objects -
     15 *
     16 * Suppose obj is an instance of a native type, e.g. Number.
     17 * Then obj.toString() invokes Number.prototype.toString().
     18 * We would also like to access Object.prototype.toString().
     19 *
     20 * The difference is this: suppose obj = new Number(7).
     21 * Invoking Number.prototype.toString() on this just returns 7.
     22 * Object.prototype.toString() on this returns '[object Number]'.
     23 *
     24 * The getJSClass() function returns 'Number', the [[Class]] property of obj.
     25 * See ECMA-262 Edition 3,  13-Oct-1999,  Section 8.6.2 
     26 */
     27 //-----------------------------------------------------------------------------
     28 
     29 
     30 var cnNoObject = 'Unexpected Error!!! Parameter to this function must be an object';
     31 var cnNoClass = 'Unexpected Error!!! Cannot find Class property';
     32 var cnObjectToString = Object.prototype.toString;
     33 var GLOBAL = 'global';
     34 
     35 
     36 // checks that it's safe to call findType()
     37 function getJSClass(obj)
     38 {
     39  if (isObject(obj))
     40    return findClass(findType(obj));
     41  return cnNoObject;
     42 }
     43 
     44 
     45 function findType(obj)
     46 {
     47  return cnObjectToString.apply(obj);
     48 }
     49 
     50 
     51 // given '[object Number]',  return 'Number'
     52 function findClass(sType)
     53 {
     54  var re =  /^\[.*\s+(\w+)\s*\]$/;
     55  var a = sType.match(re);
     56 
     57  if (a && a[1])
     58    return a[1];
     59  return cnNoClass;
     60 }
     61 
     62 
     63 function isObject(obj)
     64 {
     65  return obj instanceof Object;
     66 }