KermitPartyBot/node_modules/tmi.js/lib/events.js

/* 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");
	}

	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.");
		}
	}

	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);
		}
	} 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);
	}

	// 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();
			}
		}
	}

	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++;
			}
		}
		type = type + count;
	}

	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);
		}
	}

	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); }
	}
	else if (isObject(list)) {
		for (i = length; i-- > 0;) {
			if (list[i] === listener ||
				(list[i].listener && list[i].listener === listener)) {
				position = i;
				break;
			}
		}

		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); }
	}

	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;
	}

	// 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;
	}

	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; }
	}
	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;
}