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Delta Between Two Patch Sets: lib/events.js

Issue 29855595: Issue 6741 - Use ES2015 classes in lib/events.js (Closed) Base URL: https://hg.adblockplus.org/adblockpluscore/
Left Patch Set: Created Aug. 14, 2018, 11:30 p.m.
Right Patch Set: Address PS3 Comment Created Aug. 17, 2018, 5:26 p.m.
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1 /* 1 /*
2 * This file is part of Adblock Plus <https://adblockplus.org/>, 2 * This file is part of Adblock Plus <https://adblockplus.org/>,
3 * Copyright (C) 2006-present eyeo GmbH 3 * Copyright (C) 2006-present eyeo GmbH
4 * 4 *
5 * Adblock Plus is free software: you can redistribute it and/or modify 5 * Adblock Plus is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 3 as 6 * it under the terms of the GNU General Public License version 3 as
7 * published by the Free Software Foundation. 7 * published by the Free Software Foundation.
8 * 8 *
9 * Adblock Plus is distributed in the hope that it will be useful, 9 * Adblock Plus is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of 10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details. 12 * GNU General Public License for more details.
13 * 13 *
14 * You should have received a copy of the GNU General Public License 14 * You should have received a copy of the GNU General Public License
15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>. 15 * along with Adblock Plus. If not, see <http://www.gnu.org/licenses/>.
16 */ 16 */
17 17
18 "use strict"; 18 "use strict";
19 19
20 /** 20 /**
21 * Registers and emits named events. 21 * Registers and emits named events.
22 *
23 * @class
24 */ 22 */
25 exports.EventEmitter = class EventEmitter 23 class EventEmitter
26 { 24 {
27 constructor() 25 constructor()
28 { 26 {
29 this._listeners = new Map(); 27 this._listeners = new Map();
30 } 28 }
31 29
32 /** 30 /**
33 * adds a listener for the specified event name. 31 * Adds a listener for the specified event name.
34 * 32 *
35 * @param {string} name 33 * @param {string} name
36 * @param {function} listener 34 * @param {function} listener
37 */ 35 */
38 on(name, listener) 36 on(name, listener)
39 { 37 {
40 let listeners = this._listeners.get(name); 38 let listeners = this._listeners.get(name);
41 if (listeners) 39 if (listeners)
42 listeners.push(listener); 40 listeners.push(listener);
43 else 41 else
44 this._listeners.set(name, [listener]); 42 this._listeners.set(name, [listener]);
45 } 43 }
44
46 /** 45 /**
47 * Removes a listener for the specified event name. 46 * Removes a listener for the specified event name.
48 * 47 *
49 * @param {string} name 48 * @param {string} name
50 * @param {function} listener 49 * @param {function} listener
51 */ 50 */
52 off(name, listener) 51 off(name, listener)
53 { 52 {
54 let listeners = this._listeners.get(name); 53 let listeners = this._listeners.get(name);
55 if (listeners) 54 if (listeners)
56 { 55 {
57 let idx = listeners.indexOf(listener); 56 let idx = listeners.indexOf(listener);
58 if (idx != -1) 57 if (idx != -1)
59 listeners.splice(idx, 1); 58 listeners.splice(idx, 1);
60 } 59 }
61 } 60 }
61
62 /** 62 /**
63 * Adds a one time listener and returns a promise that 63 * Adds a one time listener and returns a promise that
64 * is resolved the next time the specified event is emitted. 64 * is resolved the next time the specified event is emitted.
65 *
65 * @param {string} name 66 * @param {string} name
66 * @return {Promise} 67 * @returns {Promise}
67 */ 68 */
68 once(name) 69 once(name)
69 { 70 {
70 return new Promise(resolve => 71 return new Promise(resolve =>
71 { 72 {
72 let listener = () => 73 let listener = () =>
73 { 74 {
74 this.off(name, listener); 75 this.off(name, listener);
75 resolve(); 76 resolve();
76 }; 77 };
77 78
78 this.on(name, listener); 79 this.on(name, listener);
79 }); 80 });
80 } 81 }
82
81 /** 83 /**
82 * Returns a copy of the array of listeners for the specified event. 84 * Returns a copy of the array of listeners for the specified event.
83 * 85 *
84 * @param {string} name 86 * @param {string} name
85 * @return {function[]} 87 * @returns {Array.<function>}
86 */ 88 */
87 listeners(name) 89 listeners(name)
88 { 90 {
89 let listeners = this._listeners.get(name); 91 let listeners = this._listeners.get(name);
90 return listeners ? listeners.slice() : []; 92 return listeners ? listeners.slice() : [];
91 } 93 }
94
92 /** 95 /**
93 * Calls all previously added listeners for the given event name. 96 * Calls all previously added listeners for the given event name.
94 * 97 *
95 * @param {string} name 98 * @param {string} name
96 * @param {...*} [arg] 99 * @param {...*} [args]
97 */ 100 */
98 emit(name, ...args) 101 emit(name, ...args)
99 { 102 {
100 let listeners = this.listeners(name); 103 let listeners = this.listeners(name);
101 for (let listener of listeners) 104 for (let listener of listeners)
102 listener(...args); 105 listener(...args);
103 } 106 }
104 }; 107 }
108
109 exports.EventEmitter = EventEmitter;
LEFTRIGHT
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