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assets/webapps/music.gaiamobile.org/components/bridge/src/emitter.js

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+'use strict';
+
+/**
+ * Exports
+ * @ignore
+ */
+
+module.exports = Emitter;
+
+/**
+ * Simple logger
+ *
+ * @type {Function}
+ * @private
+ */
+
+var debug = 0 ? console.log.bind(console, '[Emitter]') : () => {};
+
+/**
+ * Create new `Emitter`
+ *
+ * @class Emitter
+ */
+
+function Emitter(host) {
+  if (host) return Object.assign(host, Emitter.prototype);
+}
+
+Emitter.prototype = {
+
+  /**
+   * Add an event listener.
+   *
+   * It is possible to subscript to * events.
+   *
+   * @param  {String}   type
+   * @param  {Function} callback
+   * @return {this} for chaining
+   */
+
+  on: function(type, callback) {
+    debug('on', type, callback);
+    if (!this._callbacks) this._callbacks = {};
+    if (!this._callbacks[type]) this._callbacks[type] = [];
+    this._callbacks[type].push(callback);
+    return this;
+  },
+
+  /**
+   * Remove an event listener.
+   *
+   * @example
+   *
+   * emitter.off('name', fn); // remove one callback
+   * emitter.off('name'); // remove all callbacks for 'name'
+   * emitter.off(); // remove all callbacks
+   *
+   * @param  {String} [type]
+   * @param  {Function} [callback]
+   * @return {this} for chaining
+   */
+
+  off: function(type, callback) {
+    debug('off', type, callback);
+    if (this._callbacks) {
+      switch (arguments.length) {
+        case 0: this._callbacks = {}; break;
+        case 1: delete this._callbacks[type]; break;
+        default:
+          var typeListeners = this._callbacks[type];
+          if (!typeListeners) return;
+          var i = typeListeners.indexOf(callback);
+          if (~i) typeListeners.splice(i, 1);
+      }
+    }
+    return this;
+  },
+
+  /**
+   * Emit an event.
+   *
+   * @example
+   *
+   * emitter.emit('name', { some: 'data' });
+   *
+   * @param  {String} type
+   * @param  {*} [data]
+   * @return {this} for chaining
+   */
+
+  emit: function(type, data) {
+    debug('emit', type, data);
+    if (this._callbacks) {
+      var fns = this._callbacks[type] || [];
+      fns = fns.concat(this._callbacks['*'] || []);
+      for (var i = 0; i < fns.length; i++) fns[i].call(this, data, type);
+    }
+    return this;
+  }
+};
+
+var p = Emitter.prototype;
+p['off'] = p.off;
+p['on'] = p.on;