lib/prefs.js - Issue 29562599: Issue 5751 - Removing legacy gecko support

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Issue 29562599: Issue 5751 - Removing legacy gecko support (Closed)

Patch Set: Rebasing, addressing comments Created Oct. 5, 2017, 10:05 a.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

3 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

4

5 let {Services} = Cu.import("resource://gre/modules/Services.jsm", {});

6 let {XPCOMUtils} = Cu.import("resource://gre/modules/XPCOMUtils.jsm", {});

7

8 let {addonRoot, addonName} = require("info");

9 let branchName = "extensions." + addonName + ".";

10 let branch = Services.prefs.getBranch(branchName);

11 let preconfiguredBranch =

12 Services.prefs.getBranch(branchName + "preconfigured.");

13 let ignorePrefChanges = false;

14

15 function init()

16 {

17 // Load default preferences and set up properties for them

18 let defaultBranch = Services.prefs.getDefaultBranch(branchName);

19

20 let prefsData = require("prefs.json");

21 let defaults = prefsData.defaults;

22 let preconfigurable = new Set(prefsData.preconfigurable);

23 for (let pref in defaults)

24 {

25 let value = defaults[pref];

26 let [getter, setter] = typeMap[typeof value];

27 if (preconfigurable.has(pref))

28 {

29 try

30 {

31 value = getter(preconfiguredBranch, pref);

32 }

33 catch (e) {}

34 }

35 setter(defaultBranch, pref, value);

36 defineProperty(pref, false, getter, setter);

37 }

38

39 // Add preference change observer

40 try

41 {

42 branch.QueryInterface(Ci.nsIPrefBranch2).addObserver("", Prefs, true);

43 onShutdown.add(() => branch.removeObserver("", Prefs));

44 }

45 catch (e)

46 {

47 Cu.reportError(e);

48 }

49 }

50

51 /**

52 * Sets up getter/setter on Prefs object for preference.

53 */

54 function defineProperty(/*String/ name, defaultValue, /*Function/ readFunc, /*Function/ writeFunc)

55 {

56 let value = defaultValue;

57 Prefs["_update_" + name] = () =>

58 {

59 try

60 {

61 value = readFunc(branch, name);

62 triggerListeners(name);

63 }

64 catch(e)

65 {

66 Cu.reportError(e);

67 }

68 };

69 Object.defineProperty(Prefs, name, {

70 enumerable: true,

71 get: () => value,

72 set: (newValue) =>

73 {

74 if (value == newValue)

75 return value;

76

77 try

78 {

79 ignorePrefChanges = true;

80 writeFunc(branch, name, newValue);

81 value = newValue;

82 Services.prefs.savePrefFile(null);

83 triggerListeners(name);

84 }

85 catch(e)

86 {

87 Cu.reportError(e);

88 }

89 finally

90 {

91 ignorePrefChanges = false;

92 }

93 return value;

94 }

95 });

96 Prefs["_update_" + name]();

97 }

98

99 let listeners = [];

100 function triggerListeners(/*String/ name)

101 {

102 for (let i = 0; i < listeners.length; i++)

103 {

104 try

105 {

106 listeners[i](name);

107 }

108 catch(e)

109 {

110 Cu.reportError(e);

111 }

112 }

113 }

114

115 /**

116 * Manages the preferences for an extension, object properties corresponding

117 * to extension's preferences are added automatically. Setting the property

118 * will automatically change the preference, external preference changes are

119 * also recognized automatically.

120 */

121 let Prefs = exports.Prefs =

122 {

123 /**

124 * Migrates an old preference to a new name.

125 */

126 migrate: function(/*String/ oldName, /*String/ newName)

127 {

128 if (newName in this && Services.prefs.prefHasUserValue(oldName))

129 {

130 let [getter, setter] = typeMap[typeof this[newName]];

131 try

132 {

133 this[newName] = getter(Services.prefs, oldName);

134 } catch(e) {}

135 Services.prefs.clearUserPref(oldName);

136 }

137 },

138

139 /**

140 * Adds a preferences listener that will be fired whenever a preference

141 * changes.

142 */

143 addListener: function(/*Function/ listener)

144 {

145 if (listeners.indexOf(listener) < 0)

146 listeners.push(listener);

147 },

148

149 /**

150 * Removes a preferences listener.

151 */

152 removeListener: function(/*Function/ listener)

153 {

154 let index = listeners.indexOf(listener);

155 if (index >= 0)

156 listeners.splice(index, 1);

157 },

158

159 observe: function(subject, topic, data)

160 {

161 if (ignorePrefChanges \|\| topic != "nsPref:changed")

162 return;

163

164 if ("_update_" + data in this)

165 this["_update_" + data]();

166 },

167

168 QueryInterface: XPCOMUtils.generateQI([Ci.nsISupportsWeakReference, Ci.nsIObse rver])

169 };

170

171 let getIntPref = (branch, pref) => branch.getIntPref(pref);

172 let setIntPref = (branch, pref, newValue) => branch.setIntPref(pref, newValue);

173

174 let getBoolPref = (branch, pref) => branch.getBoolPref(pref);

175 let setBoolPref = (branch, pref, newValue) => branch.setBoolPref(pref, newValue) ;

176

177 let getCharPref = (branch, pref) => branch.getComplexValue(pref, Ci.nsISupportsS tring).data;

178 let setCharPref = (branch, pref, newValue) =>

179 {

180 let str = Cc["@mozilla.org/supports-string;1"].createInstance(Ci.nsISupportsSt ring);

181 str.data = newValue;

182 branch.setComplexValue(pref, Ci.nsISupportsString, str);

183 };

184

185 let getJSONPref = (branch, pref) => JSON.parse(getCharPref(branch, pref));

186 let setJSONPref = (branch, pref, newValue) => setCharPref(branch, pref, JSON.str ingify(newValue));

187

188 // Getter/setter functions for difference preference types

189 let typeMap =

190 {

191 boolean: [getBoolPref, setBoolPref],

192 number: [getIntPref, setIntPref],

193 string: [getCharPref, setCharPref],

194 object: [getJSONPref, setJSONPref]

195 };

196

197 init();

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