Side by Side Diff: lib/hooks.js
Issue 8554013:
Renamed necessary components for ABP integration (Closed)
Patch Set:
Created Oct. 10, 2012, 1:59 p.m.
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| 1 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 2 * License, v. 2.0. If a copy of the MPL was not distributed with this file, | |
| 3 * You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 4 | |
| 5 function hook(obj, name, func, cleanup) | |
| 6 { | |
| 7 let orig = obj[name]; | |
| 8 let origGet = obj.__lookupGetter__(name); | |
| 9 let origSet = obj.__lookupSetter__(name); | |
| 10 let dumbOverrideAttempt = false; | |
| 11 | |
| 12 let newFunc = function() | |
| 13 { | |
| 14 let params = arguments; | |
| 15 try | |
| 16 { | |
| 17 let result = func.apply(this, params); | |
| 18 if (typeof result == "object") | |
| 19 params = result; | |
| 20 } | |
| 21 catch(e) | |
| 22 { | |
| 23 Cu.reportError(e); | |
| 24 } | |
| 25 | |
| 26 try | |
| 27 { | |
| 28 return orig.apply(this, params); | |
| 29 } | |
| 30 finally | |
| 31 { | |
| 32 if (typeof cleanup == "function") | |
| 33 cleanup(); | |
| 34 } | |
| 35 }; | |
| 36 newFunc.toString = function() | |
| 37 { | |
| 38 dumbOverrideAttempt = true; | |
| 39 return orig.toString(); | |
| 40 }; | |
| 41 | |
| 42 obj.__defineGetter__(name, function() | |
| 43 { | |
| 44 dumbOverrideAttempt = false; | |
| 45 return newFunc; | |
| 46 }); | |
| 47 | |
| 48 obj.__defineSetter__(name, function(value) | |
| 49 { | |
| 50 if (dumbOverrideAttempt) | |
| 51 { | |
| 52 orig = value; | |
| 53 } | |
| 54 else | |
| 55 { | |
| 56 delete obj[name]; | |
| 57 obj[name] = value; | |
| 58 } | |
| 59 }); | |
| 60 | |
| 61 return function() | |
| 62 { | |
| 63 delete obj[name]; | |
| 64 obj[name] = orig; | |
| 65 if (origGet) | |
| 66 { | |
| 67 obj.__defineGetter__(name, origGet); | |
| 68 } | |
| 69 if (origSet) | |
| 70 { | |
| 71 obj.__defineSetter__(name, origSet); | |
| 72 } | |
| 73 }; | |
| 74 } | |
| 75 exports.hook = hook; | |
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