source: node_modules/eventemitter3/dist/eventemitter3.esm.js

Last change on this file was a762898, checked in by istevanoska <ilinastevanoska@…>, 5 months ago

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1function getDefaultExportFromCjs (x) {
2 return x && x.__esModule && Object.prototype.hasOwnProperty.call(x, 'default') ? x['default'] : x;
3}
4
5var eventemitter3 = {exports: {}};
6
7var hasRequiredEventemitter3;
8
9function requireEventemitter3 () {
10 if (hasRequiredEventemitter3) return eventemitter3.exports;
11 hasRequiredEventemitter3 = 1;
12 (function (module) {
13
14 var has = Object.prototype.hasOwnProperty
15 , prefix = '~';
16
17 /**
18 * Constructor to create a storage for our `EE` objects.
19 * An `Events` instance is a plain object whose properties are event names.
20 *
21 * @constructor
22 * @private
23 */
24 function Events() {}
25
26 //
27 // We try to not inherit from `Object.prototype`. In some engines creating an
28 // instance in this way is faster than calling `Object.create(null)` directly.
29 // If `Object.create(null)` is not supported we prefix the event names with a
30 // character to make sure that the built-in object properties are not
31 // overridden or used as an attack vector.
32 //
33 if (Object.create) {
34 Events.prototype = Object.create(null);
35
36 //
37 // This hack is needed because the `__proto__` property is still inherited in
38 // some old browsers like Android 4, iPhone 5.1, Opera 11 and Safari 5.
39 //
40 if (!new Events().__proto__) prefix = false;
41 }
42
43 /**
44 * Representation of a single event listener.
45 *
46 * @param {Function} fn The listener function.
47 * @param {*} context The context to invoke the listener with.
48 * @param {Boolean} [once=false] Specify if the listener is a one-time listener.
49 * @constructor
50 * @private
51 */
52 function EE(fn, context, once) {
53 this.fn = fn;
54 this.context = context;
55 this.once = once || false;
56 }
57
58 /**
59 * Add a listener for a given event.
60 *
61 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
62 * @param {(String|Symbol)} event The event name.
63 * @param {Function} fn The listener function.
64 * @param {*} context The context to invoke the listener with.
65 * @param {Boolean} once Specify if the listener is a one-time listener.
66 * @returns {EventEmitter}
67 * @private
68 */
69 function addListener(emitter, event, fn, context, once) {
70 if (typeof fn !== 'function') {
71 throw new TypeError('The listener must be a function');
72 }
73
74 var listener = new EE(fn, context || emitter, once)
75 , evt = prefix ? prefix + event : event;
76
77 if (!emitter._events[evt]) emitter._events[evt] = listener, emitter._eventsCount++;
78 else if (!emitter._events[evt].fn) emitter._events[evt].push(listener);
79 else emitter._events[evt] = [emitter._events[evt], listener];
80
81 return emitter;
82 }
83
84 /**
85 * Clear event by name.
86 *
87 * @param {EventEmitter} emitter Reference to the `EventEmitter` instance.
88 * @param {(String|Symbol)} evt The Event name.
89 * @private
90 */
91 function clearEvent(emitter, evt) {
92 if (--emitter._eventsCount === 0) emitter._events = new Events();
93 else delete emitter._events[evt];
94 }
95
96 /**
97 * Minimal `EventEmitter` interface that is molded against the Node.js
98 * `EventEmitter` interface.
99 *
100 * @constructor
101 * @public
102 */
103 function EventEmitter() {
104 this._events = new Events();
105 this._eventsCount = 0;
106 }
107
108 /**
109 * Return an array listing the events for which the emitter has registered
110 * listeners.
111 *
112 * @returns {Array}
113 * @public
114 */
115 EventEmitter.prototype.eventNames = function eventNames() {
116 var names = []
117 , events
118 , name;
119
120 if (this._eventsCount === 0) return names;
121
122 for (name in (events = this._events)) {
123 if (has.call(events, name)) names.push(prefix ? name.slice(1) : name);
124 }
125
126 if (Object.getOwnPropertySymbols) {
127 return names.concat(Object.getOwnPropertySymbols(events));
128 }
129
130 return names;
131 };
132
133 /**
134 * Return the listeners registered for a given event.
135 *
136 * @param {(String|Symbol)} event The event name.
137 * @returns {Array} The registered listeners.
138 * @public
139 */
140 EventEmitter.prototype.listeners = function listeners(event) {
141 var evt = prefix ? prefix + event : event
142 , handlers = this._events[evt];
143
144 if (!handlers) return [];
145 if (handlers.fn) return [handlers.fn];
146
147 for (var i = 0, l = handlers.length, ee = new Array(l); i < l; i++) {
148 ee[i] = handlers[i].fn;
149 }
150
151 return ee;
152 };
153
154 /**
155 * Return the number of listeners listening to a given event.
156 *
157 * @param {(String|Symbol)} event The event name.
158 * @returns {Number} The number of listeners.
159 * @public
160 */
161 EventEmitter.prototype.listenerCount = function listenerCount(event) {
162 var evt = prefix ? prefix + event : event
163 , listeners = this._events[evt];
164
165 if (!listeners) return 0;
166 if (listeners.fn) return 1;
167 return listeners.length;
168 };
169
170 /**
171 * Calls each of the listeners registered for a given event.
172 *
173 * @param {(String|Symbol)} event The event name.
174 * @returns {Boolean} `true` if the event had listeners, else `false`.
175 * @public
176 */
177 EventEmitter.prototype.emit = function emit(event, a1, a2, a3, a4, a5) {
178 var evt = prefix ? prefix + event : event;
179
180 if (!this._events[evt]) return false;
181
182 var listeners = this._events[evt]
183 , len = arguments.length
184 , args
185 , i;
186
187 if (listeners.fn) {
188 if (listeners.once) this.removeListener(event, listeners.fn, undefined, true);
189
190 switch (len) {
191 case 1: return listeners.fn.call(listeners.context), true;
192 case 2: return listeners.fn.call(listeners.context, a1), true;
193 case 3: return listeners.fn.call(listeners.context, a1, a2), true;
194 case 4: return listeners.fn.call(listeners.context, a1, a2, a3), true;
195 case 5: return listeners.fn.call(listeners.context, a1, a2, a3, a4), true;
196 case 6: return listeners.fn.call(listeners.context, a1, a2, a3, a4, a5), true;
197 }
198
199 for (i = 1, args = new Array(len -1); i < len; i++) {
200 args[i - 1] = arguments[i];
201 }
202
203 listeners.fn.apply(listeners.context, args);
204 } else {
205 var length = listeners.length
206 , j;
207
208 for (i = 0; i < length; i++) {
209 if (listeners[i].once) this.removeListener(event, listeners[i].fn, undefined, true);
210
211 switch (len) {
212 case 1: listeners[i].fn.call(listeners[i].context); break;
213 case 2: listeners[i].fn.call(listeners[i].context, a1); break;
214 case 3: listeners[i].fn.call(listeners[i].context, a1, a2); break;
215 case 4: listeners[i].fn.call(listeners[i].context, a1, a2, a3); break;
216 default:
217 if (!args) for (j = 1, args = new Array(len -1); j < len; j++) {
218 args[j - 1] = arguments[j];
219 }
220
221 listeners[i].fn.apply(listeners[i].context, args);
222 }
223 }
224 }
225
226 return true;
227 };
228
229 /**
230 * Add a listener for a given event.
231 *
232 * @param {(String|Symbol)} event The event name.
233 * @param {Function} fn The listener function.
234 * @param {*} [context=this] The context to invoke the listener with.
235 * @returns {EventEmitter} `this`.
236 * @public
237 */
238 EventEmitter.prototype.on = function on(event, fn, context) {
239 return addListener(this, event, fn, context, false);
240 };
241
242 /**
243 * Add a one-time listener for a given event.
244 *
245 * @param {(String|Symbol)} event The event name.
246 * @param {Function} fn The listener function.
247 * @param {*} [context=this] The context to invoke the listener with.
248 * @returns {EventEmitter} `this`.
249 * @public
250 */
251 EventEmitter.prototype.once = function once(event, fn, context) {
252 return addListener(this, event, fn, context, true);
253 };
254
255 /**
256 * Remove the listeners of a given event.
257 *
258 * @param {(String|Symbol)} event The event name.
259 * @param {Function} fn Only remove the listeners that match this function.
260 * @param {*} context Only remove the listeners that have this context.
261 * @param {Boolean} once Only remove one-time listeners.
262 * @returns {EventEmitter} `this`.
263 * @public
264 */
265 EventEmitter.prototype.removeListener = function removeListener(event, fn, context, once) {
266 var evt = prefix ? prefix + event : event;
267
268 if (!this._events[evt]) return this;
269 if (!fn) {
270 clearEvent(this, evt);
271 return this;
272 }
273
274 var listeners = this._events[evt];
275
276 if (listeners.fn) {
277 if (
278 listeners.fn === fn &&
279 (!once || listeners.once) &&
280 (!context || listeners.context === context)
281 ) {
282 clearEvent(this, evt);
283 }
284 } else {
285 for (var i = 0, events = [], length = listeners.length; i < length; i++) {
286 if (
287 listeners[i].fn !== fn ||
288 (once && !listeners[i].once) ||
289 (context && listeners[i].context !== context)
290 ) {
291 events.push(listeners[i]);
292 }
293 }
294
295 //
296 // Reset the array, or remove it completely if we have no more listeners.
297 //
298 if (events.length) this._events[evt] = events.length === 1 ? events[0] : events;
299 else clearEvent(this, evt);
300 }
301
302 return this;
303 };
304
305 /**
306 * Remove all listeners, or those of the specified event.
307 *
308 * @param {(String|Symbol)} [event] The event name.
309 * @returns {EventEmitter} `this`.
310 * @public
311 */
312 EventEmitter.prototype.removeAllListeners = function removeAllListeners(event) {
313 var evt;
314
315 if (event) {
316 evt = prefix ? prefix + event : event;
317 if (this._events[evt]) clearEvent(this, evt);
318 } else {
319 this._events = new Events();
320 this._eventsCount = 0;
321 }
322
323 return this;
324 };
325
326 //
327 // Alias methods names because people roll like that.
328 //
329 EventEmitter.prototype.off = EventEmitter.prototype.removeListener;
330 EventEmitter.prototype.addListener = EventEmitter.prototype.on;
331
332 //
333 // Expose the prefix.
334 //
335 EventEmitter.prefixed = prefix;
336
337 //
338 // Allow `EventEmitter` to be imported as module namespace.
339 //
340 EventEmitter.EventEmitter = EventEmitter;
341
342 //
343 // Expose the module.
344 //
345 {
346 module.exports = EventEmitter;
347 }
348 } (eventemitter3));
349 return eventemitter3.exports;
350}
351
352var eventemitter3Exports = requireEventemitter3();
353var EventEmitter = /*@__PURE__*/getDefaultExportFromCjs(eventemitter3Exports);
354
355export { EventEmitter, EventEmitter as default };
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