"use strict";
;
var EventEmitter = (function () {
    function EventEmitter() {
        this._events = this._events || {};
    }
    EventEmitter.prototype.on = function (type, listener) {
        this._events[type] = this._events[type] || [];
        this._events[type].push(listener);
    };
    EventEmitter.prototype.off = function (type, listener) {
        if (!this._events[type]) {
            return;
        }
        var obj = this._events[type];
        var i = obj.length;
        while (i--) {
            if (obj[i] === listener || obj[i].listener === listener) {
                obj.splice(i, 1);
                return;
            }
        }
    };
    EventEmitter.prototype.removeAllListeners = function (type) {
        if (this._events[type]) {
            delete this._events[type];
        }
    };
    EventEmitter.prototype.once = function (type, listener) {
        function on() {
            var args = Array.prototype.slice.call(arguments);
            this.off(type, on);
            return listener.apply(this, args);
        }
        on.listener = listener;
        return this.on(type, on);
    };
    EventEmitter.prototype.emit = function (type) {
        if (!this._events[type]) {
            return;
        }
        var args = Array.prototype.slice.call(arguments, 1);
        var obj = this._events[type];
        for (var i = 0; i < obj.length; i++) {
            obj[i].apply(this, args);
        }
    };
    EventEmitter.prototype.listeners = function (type) {
        return this._events[type] || [];
    };
    return EventEmitter;
}());
exports.EventEmitter = EventEmitter;

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