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Issue 29977555: Issue 7202 - Add hasListeners method to EventEmitter (Closed) Base URL: https://hg.adblockplus.org/adblockpluscore/
Patch Set: Add hasListeners method Created Jan. 9, 2019, 3:57 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
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46 * Removes a listener for the specified event name. 46 * Removes a listener for the specified event name.
47 * 47 *
48 * @param {string} name 48 * @param {string} name
49 * @param {function} listener 49 * @param {function} listener
50 */ 50 */
51 off(name, listener) 51 off(name, listener)
52 { 52 {
53 let listeners = this._listeners.get(name); 53 let listeners = this._listeners.get(name);
54 if (listeners) 54 if (listeners)
55 { 55 {
56 let idx = listeners.indexOf(listener); 56 if (listeners.length > 1)
57 if (idx != -1) 57 {
58 listeners.splice(idx, 1); 58 let idx = listeners.indexOf(listener);
59 if (idx != -1)
60 listeners.splice(idx, 1);
61 }
62 else if (listeners[0] === listener)
63 {
64 // We must use strict equality above for compatibility with
65 // Array.prototype.indexOf
66 this._listeners.delete(name);
67 }
59 } 68 }
60 } 69 }
61 70
62 /** 71 /**
63 * Adds a one time listener and returns a promise that 72 * Adds a one time listener and returns a promise that
64 * is resolved the next time the specified event is emitted. 73 * is resolved the next time the specified event is emitted.
65 * 74 *
66 * @param {string} name 75 * @param {string} name
67 * @returns {Promise} 76 * @returns {Promise}
68 */ 77 */
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86 * @param {string} name 95 * @param {string} name
87 * @returns {Array.<function>} 96 * @returns {Array.<function>}
88 */ 97 */
89 listeners(name) 98 listeners(name)
90 { 99 {
91 let listeners = this._listeners.get(name); 100 let listeners = this._listeners.get(name);
92 return listeners ? listeners.slice() : []; 101 return listeners ? listeners.slice() : [];
93 } 102 }
94 103
95 /** 104 /**
105 * Checks whether there are any listeners for the specified event.
106 *
107 * @param {string} [name] The name of the event. If omitted, checks whether
108 * there are any listeners for any event.
109 * @returns {boolean}
110 */
111 hasListeners(name)
112 {
113 return this._listeners.size > 0 &&
114 (typeof name == "undefined" || this._listeners.has(name));
115 }
116
117 /**
96 * Calls all previously added listeners for the given event name. 118 * Calls all previously added listeners for the given event name.
97 * 119 *
98 * @param {string} name 120 * @param {string} name
99 * @param {...*} [args] 121 * @param {...*} [args]
100 */ 122 */
101 emit(name, ...args) 123 emit(name, ...args)
102 { 124 {
103 let listeners = this.listeners(name); 125 let listeners = this.listeners(name);
104 for (let listener of listeners) 126 for (let listener of listeners)
105 listener(...args); 127 listener(...args);
106 } 128 }
107 } 129 }
108 130
109 exports.EventEmitter = EventEmitter; 131 exports.EventEmitter = EventEmitter;
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