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events: replace EventEmitter with a more simple version with the same…
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… API
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@AlcaDesign
AlcaDesign committed Jun 17, 2024
1 parent 881f9e0 commit f727b28
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Showing 2 changed files with 45 additions and 298 deletions.
15 changes: 1 addition & 14 deletions lib/client.js
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Original file line number Diff line number Diff line change
@@ -1,6 +1,6 @@
const _global = typeof global !== 'undefined' ? global : typeof window !== 'undefined' ? window : {};
const _WebSocket = _global.WebSocket || require('ws');
const EventEmitter = require('./events').EventEmitter;
const EventEmitter = require('./events');
const logger = require('./logger');
const parse = require('./parser');
const Queue = require('./timer');
Expand Down Expand Up @@ -60,19 +60,6 @@ class client extends EventEmitter {

// Format the channel names..
this.opts.channels.forEach((n, i, a) => a[i] = _.channel(n));

EventEmitter.call(this);
this.setMaxListeners(0);
}
// Emit multiple events..
emits(types, values) {
for(let i = 0; i < types.length; i++) {
const val = i < values.length ? values[i] : values[values.length - 1];
this.emit.apply(this, [ types[i] ].concat(val));
}
}
off(event, listener) {
this.removeListener(event, listener);
}
// Handle parsed chat server message..
handleMessage(message) {
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328 changes: 44 additions & 284 deletions lib/events.js
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Original file line number Diff line number Diff line change
@@ -1,301 +1,61 @@
/* istanbul ignore file */
/* eslint-disable */
/*
* Copyright Joyent, Inc. and other Node contributors.
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the
* "Software"), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to permit
* persons to whom the Software is furnished to do so, subject to the
* following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
* NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
* USE OR OTHER DEALINGS IN THE SOFTWARE.
*/

function EventEmitter() {
this._events = this._events || {};
this._maxListeners = this._maxListeners || undefined;
}

module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
if (!isNumber(n) || n < 0 || isNaN(n)) {
throw TypeError("n must be a positive number");
class EventEmitter {
constructor() {
this._events = new Map();
}

this._maxListeners = n;

return this;
};

EventEmitter.prototype.emit = function(type) {
var er, handler, len, args, i, listeners;

if (!this._events) { this._events = {}; }

// If there is no 'error' event listener then throw.
if (type === "error") {
if (!this._events.error || (isObject(this._events.error) && !this._events.error.length)) {
er = arguments[1];
if (er instanceof Error) { throw er; }
throw TypeError("Uncaught, unspecified \"error\" event.");
emit(type, ...args) {
const listeners = this._events.get(type);
if(!listeners) {
return false;
}
}

handler = this._events[type];

if (isUndefined(handler)) { return false; }

if (isFunction(handler)) {
switch (arguments.length) {
// fast cases
case 1:
handler.call(this);
break;
case 2:
handler.call(this, arguments[1]);
break;
case 3:
handler.call(this, arguments[1], arguments[2]);
break;
// slower
default:
args = Array.prototype.slice.call(arguments, 1);
handler.apply(this, args);
for(const listener of listeners) {
listener.apply(this, args);
}
} else if (isObject(handler)) {
args = Array.prototype.slice.call(arguments, 1);
listeners = handler.slice();
len = listeners.length;
for (i = 0; i < len; i++) { listeners[i].apply(this, args); }
}

return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
var m;

if (!isFunction(listener)) { throw TypeError("listener must be a function"); }

if (!this._events) { this._events = {}; }

// To avoid recursion in the case that type === "newListener"! Before
// adding it to the listeners, first emit "newListener".
if (this._events.newListener) {
this.emit("newListener", type, isFunction(listener.listener) ? listener.listener : listener);
return true;
}

// Optimize the case of one listener. Don't need the extra array object.
if (!this._events[type]) { this._events[type] = listener; }
// If we've already got an array, just append.
else if (isObject(this._events[type])) { this._events[type].push(listener); }
// Adding the second element, need to change to array.
else { this._events[type] = [this._events[type], listener]; }

// Check for listener leak
if (isObject(this._events[type]) && !this._events[type].warned) {
if (!isUndefined(this._maxListeners)) {
m = this._maxListeners;
} else {
m = EventEmitter.defaultMaxListeners;
}

if (m && m > 0 && this._events[type].length > m) {
this._events[type].warned = true;
console.error("(node) warning: possible EventEmitter memory leak detected. %d listeners added. Use emitter.setMaxListeners() to increase limit.", this._events[type].length);
// Not supported in IE 10
if (typeof console.trace === "function") {
console.trace();
}
emits(types, values) {
for(let i = 0; i < types.length; i++) {
const val = i < values.length ? values[i] : values[values.length - 1];
this.emit.apply(this, [ types[i] ].concat(val));
}
}

return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

// Modified to support multiple calls..
EventEmitter.prototype.once = function(type, listener) {
if (!isFunction(listener)) { throw TypeError("listener must be a function"); }

var fired = false;

if (this._events.hasOwnProperty(type) && type.charAt(0) === "_") {
var count = 1;
var searchFor = type;

for (var k in this._events){
if (this._events.hasOwnProperty(k) && k.startsWith(searchFor)) {
count++;
}
addListener(type, listener) {
if(!this._events.has(type)) {
this._events.set(type, new Set());
}
type = type + count;
this._events.get(type).add(listener);
}

function g() {
if (type.charAt(0) === "_" && !isNaN(type.substr(type.length - 1))) {
type = type.substring(0, type.length - 1);
}
this.removeListener(type, g);

if (!fired) {
fired = true;
listener.apply(this, arguments);
}
on(type, listener) {
this.addListener(type, listener);
}

g.listener = listener;
this.on(type, g);

return this;
};

// Emits a "removeListener" event if the listener was removed..
// Modified to support multiple calls from .once()..
EventEmitter.prototype.removeListener = function(type, listener) {
var list, position, length, i;

if (!isFunction(listener)) { throw TypeError("listener must be a function"); }

if (!this._events || !this._events[type]) { return this; }

list = this._events[type];
length = list.length;
position = -1;
if (list === listener || (isFunction(list.listener) && list.listener === listener)) {
delete this._events[type];

if (this._events.hasOwnProperty(type + "2") && type.charAt(0) === "_") {
var searchFor = type;
for (var k in this._events){
if (this._events.hasOwnProperty(k) && k.startsWith(searchFor)) {
if (!isNaN(parseInt(k.substr(k.length - 1)))) {
this._events[type + parseInt(k.substr(k.length - 1) - 1)] = this._events[k];
delete this._events[k];
}
}
}

this._events[type] = this._events[type + "1"];
delete this._events[type + "1"];
}
if (this._events.removeListener) { this.emit("removeListener", type, listener); }
once(type, listener) {
const wrapped = (...args) => {
this.removeListener(type, wrapped);
listener.apply(this, args);
};
this.addListener(type, wrapped);
}
else if (isObject(list)) {
for (i = length; i-- > 0;) {
if (list[i] === listener ||
(list[i].listener && list[i].listener === listener)) {
position = i;
break;
}
removeListener(type, listener) {
if(!this._events.has(type)) {
return;
}

if (position < 0) { return this; }

if (list.length === 1) {
list.length = 0;
delete this._events[type];
}
else { list.splice(position, 1); }

if (this._events.removeListener) { this.emit("removeListener", type, listener); }
this._events.get(type).delete(listener);
}

return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
var key, listeners;

if (!this._events) { return this; }

// not listening for removeListener, no need to emit
if (!this._events.removeListener) {
if (arguments.length === 0) { this._events = {}; }
else if (this._events[type]) { delete this._events[type]; }
return this;
off(type, listener) {
this.removeListener(type, listener);
}

// emit removeListener for all listeners on all events
if (arguments.length === 0) {
for (key in this._events) {
if (key === "removeListener") { continue; }
this.removeAllListeners(key);
}
this.removeAllListeners("removeListener");
this._events = {};
return this;
removeAllListeners(type) {
this._events.delete(type);
}

listeners = this._events[type];

if (isFunction(listeners)) { this.removeListener(type, listeners); }
else if (listeners) { while (listeners.length) { this.removeListener(type, listeners[listeners.length - 1]); } }
delete this._events[type];

return this;
};

EventEmitter.prototype.listeners = function(type) {
var ret;
if (!this._events || !this._events[type]) { ret = []; }
else if (isFunction(this._events[type])) { ret = [this._events[type]]; }
else { ret = this._events[type].slice(); }
return ret;
};

EventEmitter.prototype.listenerCount = function(type) {
if (this._events) {
var evlistener = this._events[type];

if (isFunction(evlistener)) { return 1; }
else if (evlistener) { return evlistener.length; }
listeners(type) {
return this._events.get(type);
}
listenerCount(type) {
const listeners = this._events.get(type);
if(!listeners) {
return 0;
}
return listeners.size;
}
return 0;
};

EventEmitter.listenerCount = function(emitter, type) {
return emitter.listenerCount(type);
};

function isFunction(arg) {
return typeof arg === "function";
}

function isNumber(arg) {
return typeof arg === "number";
}

function isObject(arg) {
return typeof arg === "object" && arg !== null;
}

function isUndefined(arg) {
return arg === void 0;
}
module.exports = EventEmitter;

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