utila/lib/LiteEmitter.js

// Generated by CoffeeScript 1.6.3
var Emitter;

module.exports = Emitter = (function() {
  function Emitter() {
    this._listeners = {};
  }

  Emitter.prototype.on = function(eventName, listener) {
    if (this._listeners[eventName] == null) {
      this._listeners[eventName] = [];
    }
    this._listeners[eventName].push(listener);
    return this;
  };

  Emitter.prototype.once = function(eventName, listener) {
    var cb, ran,
      _this = this;
    ran = false;
    cb = function() {
      if (ran) {
        return;
      }
      ran = true;
      listener();
      return setTimeout(function() {
        return _this.off(eventName, cb);
      }, 0);
    };
    this.on(eventName, cb);
    return this;
  };

  Emitter.prototype.off = function(eventName, listener) {
    if (this._listeners[eventName] == null) {
      return this;
    }
    this._listeners[eventName].splice(this._listeners[eventName].indexOf(listener), 1);
    return this;
  };

  Emitter.prototype._emit = function(eventName, data) {
    var listener, _i, _len, _ref;
    if (this._listeners[eventName] == null) {
      return;
    }
    _ref = this._listeners[eventName];
    for (_i = 0, _len = _ref.length; _i < _len; _i++) {
      listener = _ref[_i];
      listener.call(this, data);
    }
  };

  return Emitter;

})();