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'use strict';
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var domain;
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function EventEmitter() {
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EventEmitter.init.call(this);
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}
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module.exports = EventEmitter;
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// Backwards-compat with node 0.10.x
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EventEmitter.EventEmitter = EventEmitter;
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EventEmitter.usingDomains = false;
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EventEmitter.prototype.domain = undefined;
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EventEmitter.prototype._events = undefined;
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EventEmitter.prototype._maxListeners = undefined;
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// By default EventEmitters will print a warning if more than 10 listeners are
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// added to it. This is a useful default which helps finding memory leaks.
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EventEmitter.defaultMaxListeners = 10;
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EventEmitter.init = function() {
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this.domain = null;
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if (EventEmitter.usingDomains) {
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// if there is an active domain, then attach to it.
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domain = domain || require('domain');
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if (domain.active && !(this instanceof domain.Domain)) {
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this.domain = domain.active;
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}
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}
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if (!this._events || this._events === Object.getPrototypeOf(this)._events) {
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this._events = {};
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this._eventsCount = 0;
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}
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this._maxListeners = this._maxListeners || undefined;
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};
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// Obviously not all Emitters should be limited to 10. This function allows
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// that to be increased. Set to zero for unlimited.
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EventEmitter.prototype.setMaxListeners = function setMaxListeners(n) {
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if (typeof n !== 'number' || n < 0 || isNaN(n))
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throw new TypeError('n must be a positive number');
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this._maxListeners = n;
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return this;
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};
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function $getMaxListeners(that) {
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if (that._maxListeners === undefined)
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return EventEmitter.defaultMaxListeners;
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return that._maxListeners;
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}
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EventEmitter.prototype.getMaxListeners = function getMaxListeners() {
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return $getMaxListeners(this);
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};
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// These standalone emit* functions are used to optimize calling of event
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// handlers for fast cases because emit() itself often has a variable number of
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// arguments and can be deoptimized because of that. These functions always have
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// the same number of arguments and thus do not get deoptimized, so the code
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// inside them can execute faster.
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function emitNone(handler, isFn, self) {
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if (isFn)
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handler.call(self);
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else {
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var len = handler.length;
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var listeners = arrayClone(handler, len);
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for (var i = 0; i < len; ++i)
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listeners[i].call(self);
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}
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}
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function emitOne(handler, isFn, self, arg1) {
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if (isFn)
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handler.call(self, arg1);
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else {
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var len = handler.length;
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var listeners = arrayClone(handler, len);
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for (var i = 0; i < len; ++i)
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listeners[i].call(self, arg1);
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}
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}
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function emitTwo(handler, isFn, self, arg1, arg2) {
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if (isFn)
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handler.call(self, arg1, arg2);
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else {
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var len = handler.length;
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var listeners = arrayClone(handler, len);
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for (var i = 0; i < len; ++i)
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listeners[i].call(self, arg1, arg2);
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}
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}
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function emitThree(handler, isFn, self, arg1, arg2, arg3) {
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if (isFn)
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handler.call(self, arg1, arg2, arg3);
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else {
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var len = handler.length;
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var listeners = arrayClone(handler, len);
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for (var i = 0; i < len; ++i)
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listeners[i].call(self, arg1, arg2, arg3);
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}
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}
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function emitMany(handler, isFn, self, args) {
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if (isFn)
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handler.apply(self, args);
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else {
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var len = handler.length;
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var listeners = arrayClone(handler, len);
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for (var i = 0; i < len; ++i)
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listeners[i].apply(self, args);
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}
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}
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EventEmitter.prototype.emit = function emit(type) {
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var er, handler, len, args, i, events, domain;
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var needDomainExit = false;
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var doError = (type === 'error');
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events = this._events;
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if (events)
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doError = (doError && events.error == null);
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else if (!doError)
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return false;
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domain = this.domain;
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// If there is no 'error' event listener then throw.
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if (doError) {
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er = arguments[1];
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if (domain) {
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if (!er)
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er = new Error('Uncaught, unspecified "error" event.');
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er.domainEmitter = this;
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er.domain = domain;
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er.domainThrown = false;
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domain.emit('error', er);
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} else if (er instanceof Error) {
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throw er; // Unhandled 'error' event
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} else {
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throw new Error('Uncaught, unspecified "error" event.');
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}
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return false;
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}
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handler = events[type];
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if (!handler)
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return false;
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if (domain && this !== process) {
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domain.enter();
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needDomainExit = true;
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}
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var isFn = typeof handler === 'function';
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len = arguments.length;
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switch (len) {
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// fast cases
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case 1:
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emitNone(handler, isFn, this);
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break;
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case 2:
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emitOne(handler, isFn, this, arguments[1]);
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break;
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case 3:
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emitTwo(handler, isFn, this, arguments[1], arguments[2]);
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break;
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case 4:
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emitThree(handler, isFn, this, arguments[1], arguments[2], arguments[3]);
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break;
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// slower
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default:
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args = new Array(len - 1);
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for (i = 1; i < len; i++)
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args[i - 1] = arguments[i];
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emitMany(handler, isFn, this, args);
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}
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if (needDomainExit)
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domain.exit();
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return true;
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};
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EventEmitter.prototype.addListener = function addListener(type, listener) {
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var m;
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var events;
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var existing;
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if (typeof listener !== 'function')
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throw new TypeError('listener must be a function');
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events = this._events;
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if (!events) {
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events = this._events = {};
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this._eventsCount = 0;
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} else {
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// To avoid recursion in the case that type === "newListener"! Before
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// adding it to the listeners, first emit "newListener".
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if (events.newListener) {
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this.emit('newListener', type,
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listener.listener ? listener.listener : listener);
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// Re-assign `events` because a newListener handler could have caused the
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// this._events to be assigned to a new object
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events = this._events;
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}
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existing = events[type];
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}
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if (!existing) {
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// Optimize the case of one listener. Don't need the extra array object.
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existing = events[type] = listener;
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++this._eventsCount;
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} else {
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if (typeof existing === 'function') {
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// Adding the second element, need to change to array.
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existing = events[type] = [existing, listener];
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} else {
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// If we've already got an array, just append.
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existing.push(listener);
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}
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// Check for listener leak
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if (!existing.warned) {
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m = $getMaxListeners(this);
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if (m && m > 0 && existing.length > m) {
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existing.warned = true;
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console.error('(node) warning: possible EventEmitter memory ' +
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'leak detected. %d %s listeners added. ' +
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'Use emitter.setMaxListeners() to increase limit.',
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existing.length, type);
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console.trace();
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}
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}
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}
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return this;
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};
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EventEmitter.prototype.on = EventEmitter.prototype.addListener;
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EventEmitter.prototype.once = function once(type, listener) {
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if (typeof listener !== 'function')
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throw new TypeError('listener must be a function');
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var fired = false;
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function g() {
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this.removeListener(type, g);
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if (!fired) {
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fired = true;
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listener.apply(this, arguments);
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}
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}
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g.listener = listener;
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this.on(type, g);
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return this;
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};
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// emits a 'removeListener' event iff the listener was removed
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EventEmitter.prototype.removeListener =
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function removeListener(type, listener) {
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var list, events, position, i;
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if (typeof listener !== 'function')
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throw new TypeError('listener must be a function');
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events = this._events;
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if (!events)
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return this;
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list = events[type];
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if (!list)
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return this;
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if (list === listener || (list.listener && list.listener === listener)) {
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if (--this._eventsCount === 0)
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this._events = {};
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else {
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delete events[type];
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if (events.removeListener)
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this.emit('removeListener', type, listener);
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}
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} else if (typeof list !== 'function') {
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position = -1;
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for (i = list.length; i-- > 0;) {
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if (list[i] === listener ||
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(list[i].listener && list[i].listener === listener)) {
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position = i;
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break;
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}
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}
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if (position < 0)
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return this;
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if (list.length === 1) {
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list[0] = undefined;
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if (--this._eventsCount === 0) {
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this._events = {};
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return this;
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} else
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delete events[type];
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} else {
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spliceOne(list, position);
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}
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if (events.removeListener)
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this.emit('removeListener', type, listener);
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}
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return this;
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};
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EventEmitter.prototype.removeAllListeners =
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function removeAllListeners(type) {
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var listeners, events;
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events = this._events;
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if (!events)
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return this;
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// not listening for removeListener, no need to emit
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if (!events.removeListener) {
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if (arguments.length === 0) {
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this._events = {};
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this._eventsCount = 0;
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} else if (events[type]) {
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if (--this._eventsCount === 0)
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this._events = {};
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else
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delete events[type];
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}
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return this;
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}
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// emit removeListener for all listeners on all events
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if (arguments.length === 0) {
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var keys = Object.keys(events);
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for (var i = 0, key; i < keys.length; ++i) {
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key = keys[i];
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if (key === 'removeListener') continue;
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this.removeAllListeners(key);
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}
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this.removeAllListeners('removeListener');
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this._events = {};
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this._eventsCount = 0;
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return this;
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}
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listeners = events[type];
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if (typeof listeners === 'function') {
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this.removeListener(type, listeners);
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} else if (listeners) {
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// LIFO order
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do {
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this.removeListener(type, listeners[listeners.length - 1]);
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} while (listeners[0]);
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}
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return this;
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};
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EventEmitter.prototype.listeners = function listeners(type) {
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var evlistener;
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var ret;
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var events = this._events;
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if (!events)
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ret = [];
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else {
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evlistener = events[type];
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if (!evlistener)
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ret = [];
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else if (typeof evlistener === 'function')
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ret = [evlistener];
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else
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ret = arrayClone(evlistener, evlistener.length);
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}
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return ret;
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};
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EventEmitter.listenerCount = function(emitter, type) {
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var evlistener;
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var ret = 0;
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var events = emitter._events;
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if (events) {
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evlistener = events[type];
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if (typeof evlistener === 'function')
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ret = 1;
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else if (evlistener)
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ret = evlistener.length;
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}
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return ret;
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};
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// About 1.5x faster than the two-arg version of Array#splice().
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function spliceOne(list, index) {
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for (var i = index, k = i + 1, n = list.length; k < n; i += 1, k += 1)
|
|
|
|
list[i] = list[k];
|
|
|
|
list.pop();
|
|
|
|
}
|
|
|
|
|
|
|
|
function arrayClone(arr, i) {
|
|
|
|
var copy = new Array(i);
|
|
|
|
while (i--)
|
|
|
|
copy[i] = arr[i];
|
|
|
|
return copy;
|
|
|
|
}
|