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index.js
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index.js
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'use strict';
function addEventListener(listeners, event, listener, type) {
if (listeners[type] === undefined) {
listeners[type] = {};
}
var typeEvent = listeners[type][event];
if (typeEvent === undefined) {
listeners[type][event] = typeEvent = [];
}
typeEvent[typeEvent.length] = listener;
}
function removeEventListener(listeners, callback, context) {
if (listeners && listeners.length) {
var newListeners = [];
for (var i = 0; i < listeners.length; i++) {
var listener = listeners[i];
if (listener[0] !== callback || (context && context !== listener[1])) {
newListeners[newListeners.length] = listener;
}
}
return newListeners;
}
}
function emitEvent(listeners, a1, a2) {
var listener;
if (listeners.length === 1) {
listener = listeners[0];
if (a2 === undefined) {
listener[0].call(listener[1], a1);
} else {
listener[0].call(listener[1], a1, a2);
}
return;
}
var length = listeners.length;
while (--length) {
listener = listeners[length];
listener[0].call(listener[1], a1, a2);
}
}
function EventEmitter() {
this.onListeners = undefined;
this.onceListeners = undefined;
}
['on', 'once'].forEach(function (type) {
EventEmitter.prototype[type] = function (event, callback, context) {
addEventListener(this, event, [callback, context], type + 'Listeners');
return this;
};
});
EventEmitter.prototype.emit = function (event, a1, a2) {
var listeners;
var fired = false;
if (this.onListeners !== undefined) {
listeners = this.onListeners[event];
if (listeners) {
emitEvent(listeners, a1, a2);
fired = true;
}
}
if (this.onceListeners !== undefined) {
listeners = this.onceListeners[event];
if (listeners !== undefined) {
this.onceListeners[event] = undefined;
emitEvent(listeners, a1, a2);
fired = true;
}
}
return fired;
};
EventEmitter.prototype.listeners = function (event) {
var onListeners = this.onListeners[event];
var onceListeners = this.onceListeners[event];
if (onListeners !== undefined) {
if (onceListeners !== undefined) {
return Array.concat(onListeners, onceListeners);
}
return onListeners;
}
if (onceListeners !== undefined) {
return onceListeners;
}
};
EventEmitter.prototype.removeListener = function (event, callback, context) {
if (this.onListeners !== undefined) {
this.onListeners[event] = removeEventListener(
this.onListeners[event], callback, context
);
}
if (this.onceListeners !== undefined) {
this.onceListeners[event] = removeEventListener(
this.onceListeners[event], callback, context
);
}
return this;
};
EventEmitter.prototype.removeAllListeners = function (event) {
if (event) {
if (this.onListeners !== undefined) {
this.onListeners[event] = undefined;
}
if (this.onceListeners !== undefined) {
this.onceListeners[event] = undefined;
}
return;
}
this.onListeners = this.onceListeners = undefined;
return this;
};
EventEmitter.prototype.addListener = EventEmitter.prototype.on;
EventEmitter.prototype.setMaxListeners = function () {
return this;
};
EventEmitter.EventEmitter = EventEmitter;
module.exports = EventEmitter;