lib/hooks.js - Issue 8554013: Renamed necessary components for ABP integration

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Side by Side Diff: lib/hooks.js

Issue 8554013: Renamed necessary components for ABP integration (Closed)

Patch Set: Created Oct. 10, 2012, 1:08 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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