The Tor Browser / file comparison
comparison: js/src/tests/ecma_3/Object/shell.js
js/src/tests/ecma_3/Object/shell.js
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
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| -1:000000000000 | 0:8473112c2340 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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 * Date: 14 Mar 2001 | |
| 8 * | |
| 9 * SUMMARY: Utility functions for testing objects - | |
| 10 * | |
| 11 * Suppose obj is an instance of a native type, e.g. Number. | |
| 12 * Then obj.toString() invokes Number.prototype.toString(). | |
| 13 * We would also like to access Object.prototype.toString(). | |
| 14 * | |
| 15 * The difference is this: suppose obj = new Number(7). | |
| 16 * Invoking Number.prototype.toString() on this just returns 7. | |
| 17 * Object.prototype.toString() on this returns '[object Number]'. | |
| 18 * | |
| 19 * The getJSType() function below will return '[object Number]' for us. | |
| 20 * The getJSClass() function returns 'Number', the [[Class]] property of obj. | |
| 21 * See ECMA-262 Edition 3, 13-Oct-1999, Section 8.6.2 | |
| 22 */ | |
| 23 //----------------------------------------------------------------------------- | |
| 24 | |
| 25 | |
| 26 var cnNoObject = 'Unexpected Error!!! Parameter to this function must be an object'; | |
| 27 var cnNoClass = 'Unexpected Error!!! Cannot find Class property'; | |
| 28 var cnObjectToString = Object.prototype.toString; | |
| 29 var GLOBAL = 'global'; | |
| 30 | |
| 31 // checks that it's safe to call findType() | |
| 32 function getJSType(obj) | |
| 33 { | |
| 34 if (isObject(obj)) | |
| 35 return findType(obj); | |
| 36 return cnNoObject; | |
| 37 } | |
| 38 | |
| 39 | |
| 40 // checks that it's safe to call findType() | |
| 41 function getJSClass(obj) | |
| 42 { | |
| 43 if (isObject(obj)) | |
| 44 return findClass(findType(obj)); | |
| 45 return cnNoObject; | |
| 46 } | |
| 47 | |
| 48 | |
| 49 function findType(obj) | |
| 50 { | |
| 51 return cnObjectToString.apply(obj); | |
| 52 } | |
| 53 | |
| 54 | |
| 55 // given '[object Number]', return 'Number' | |
| 56 function findClass(sType) | |
| 57 { | |
| 58 var re = /^\[.*\s+(\w+)\s*\]$/; | |
| 59 var a = sType.match(re); | |
| 60 | |
| 61 if (a && a[1]) | |
| 62 return a[1]; | |
| 63 return cnNoClass; | |
| 64 } | |
| 65 | |
| 66 | |
| 67 function isObject(obj) | |
| 68 { | |
| 69 return obj instanceof Object; | |
| 70 } | |
| 71 |
