git.r.bdr.sh - rbdr/dotfiles/blob - atom/packages/ex-mode/node_modules/event-kit/lib/emitter.js

   1 (function() {
   2   var Disposable, Emitter;
   3
   4   Disposable = require('./disposable');
   5
   6   module.exports = Emitter = (function() {
   7     Emitter.prototype.isDisposed = false;
   8
   9
  10     /*
  11     Section: Construction and Destruction
  12      */
  13
  14     function Emitter() {
  15       this.handlersByEventName = {};
  16     }
  17
  18     Emitter.prototype.dispose = function() {
  19       this.handlersByEventName = null;
  20       return this.isDisposed = true;
  21     };
  22
  23
  24     /*
  25     Section: Event Subscription
  26      */
  27
  28     Emitter.prototype.on = function(eventName, handler) {
  29       var currentHandlers;
  30       if (this.isDisposed) {
  31         throw new Error("Emitter has been disposed");
  32       }
  33       if (typeof handler !== 'function') {
  34         throw new Error("Handler must be a function");
  35       }
  36       if (currentHandlers = this.handlersByEventName[eventName]) {
  37         this.handlersByEventName[eventName] = currentHandlers.concat(handler);
  38       } else {
  39         this.handlersByEventName[eventName] = [handler];
  40       }
  41       return new Disposable(this.off.bind(this, eventName, handler));
  42     };
  43
  44     Emitter.prototype.off = function(eventName, handlerToRemove) {
  45       var handler, newHandlers, oldHandlers, _i, _len;
  46       if (this.isDisposed) {
  47         return;
  48       }
  49       if (oldHandlers = this.handlersByEventName[eventName]) {
  50         newHandlers = [];
  51         for (_i = 0, _len = oldHandlers.length; _i < _len; _i++) {
  52           handler = oldHandlers[_i];
  53           if (handler !== handlerToRemove) {
  54             newHandlers.push(handler);
  55           }
  56         }
  57         return this.handlersByEventName[eventName] = newHandlers;
  58       }
  59     };
  60
  61
  62     /*
  63     Section: Event Emission
  64      */
  65
  66     Emitter.prototype.emit = function(eventName, value) {
  67       var handler, handlers, _i, _len, _ref;
  68       if (handlers = (_ref = this.handlersByEventName) != null ? _ref[eventName] : void 0) {
  69         for (_i = 0, _len = handlers.length; _i < _len; _i++) {
  70           handler = handlers[_i];
  71           handler(value);
  72         }
  73       }
  74     };
  75
  76     return Emitter;
  77
  78   })();
  79
  80 }).call(this);