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✏️ Editing: backbone.radio.js

/*! elementor - v0.7.1 - 18-08-2016 */
// Backbone.Radio v1.0.4

(function (global, factory) {
  typeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('underscore'), require('backbone')) :
  typeof define === 'function' && define.amd ? define(['underscore', 'backbone'], factory) :
  (global.Backbone = global.Backbone || {}, global.Backbone.Radio = factory(global._,global.Backbone));
}(this, function (_,Backbone) { 'use strict';

_ = 'default' in _ ? _['default'] : _;
  Backbone = 'default' in Backbone ? Backbone['default'] : Backbone;

var previousRadio = Backbone.Radio;

var Radio = Backbone.Radio = {};

Radio.VERSION = '1.0.4';

// This allows you to run multiple instances of Radio on the same
  // webapp. After loading the new version, call `noConflict()` to
  // get a reference to it. At the same time the old version will be
  // returned to Backbone.Radio.
  Radio.noConflict = function () {
    Backbone.Radio = previousRadio;
    return this;
  };

// Whether or not we're in DEBUG mode or not. DEBUG mode helps you
  // get around the issues of lack of warnings when events are mis-typed.
  Radio.DEBUG = false;

// Format debug text.
  Radio._debugText = function (warning, eventName, channelName) {
    return warning + (channelName ? ' on the ' + channelName + ' channel' : '') + ': "' + eventName + '"';
  };

// This is the method that's called when an unregistered event was called.
  // By default, it logs warning to the console. By overriding this you could
  // make it throw an Error, for instance. This would make firing a nonexistent event
  // have the same consequence as firing a nonexistent method on an Object.
  Radio.debugLog = function (warning, eventName, channelName) {
    if (Radio.DEBUG && console && console.warn) {
      console.warn(Radio._debugText(warning, eventName, channelName));
    }
  };

var eventSplitter = /\s+/;

// An internal method used to handle Radio's method overloading for Requests.
  // It's borrowed from Backbone.Events. It differs from Backbone's overload
  // API (which is used in Backbone.Events) in that it doesn't support space-separated
  // event names.
  Radio._eventsApi = function (obj, action, name, rest) {
    if (!name) {
      return false;
    }

var results = {};

// Handle event maps.
    if ((typeof name === 'undefined' ? 'undefined' : babelHelpers.typeof(name)) === 'object') {
      for (var key in name) {
        var result = obj[action].apply(obj, [key, name[key]].concat(rest));
        eventSplitter.test(key) ? _.extend(results, result) : results[key] = result;
      }
      return results;
    }

// Handle space separated event names.
    if (eventSplitter.test(name)) {
      var names = name.split(eventSplitter);
      for (var i = 0, l = names.length; i < l; i++) {
        results[names[i]] = obj[action].apply(obj, [names[i]].concat(rest));
      }
      return results;
    }

return false;
  };

// An optimized way to execute callbacks.
  Radio._callHandler = function (callback, context, args) {
    var a1 = args[0],
        a2 = args[1],
        a3 = args[2];
    switch (args.length) {
      case 0:
        return callback.call(context);
      case 1:
        return callback.call(context, a1);
      case 2:
        return callback.call(context, a1, a2);
      case 3:
        return callback.call(context, a1, a2, a3);
      default:
        return callback.apply(context, args);
    }
  };

// A helper used by `off` methods to the handler from the store
  function removeHandler(store, name, callback, context) {
    var event = store[name];
    if ((!callback || callback === event.callback || callback === event.callback._callback) && (!context || context === event.context)) {
      delete store[name];
      return true;
    }
  }

function removeHandlers(store, name, callback, context) {
    store || (store = {});
    var names = name ? [name] : _.keys(store);
    var matched = false;

for (var i = 0, length = names.length; i < length; i++) {
      name = names[i];

// If there's no event by this name, log it and continue
      // with the loop
      if (!store[name]) {
        continue;
      }

if (removeHandler(store, name, callback, context)) {
        matched = true;
      }
    }

return matched;
  }

/*
   * tune-in
   * -------
   * Get console logs of a channel's activity
   *
   */

var _logs = {};

// This is to produce an identical function in both tuneIn and tuneOut,
  // so that Backbone.Events unregisters it.
  function _partial(channelName) {
    return _logs[channelName] || (_logs[channelName] = _.partial(Radio.log, channelName));
  }

_.extend(Radio, {

// Log information about the channel and event
    log: function log(channelName, eventName) {
      if (typeof console === 'undefined') {
        return;
      }
      var args = _.drop(arguments, 2);
      console.log('[' + channelName + '] "' + eventName + '"', args);
    },

// Logs all events on this channel to the console. It sets an
    // internal value on the channel telling it we're listening,
    // then sets a listener on the Backbone.Events
    tuneIn: function tuneIn(channelName) {
      var channel = Radio.channel(channelName);
      channel._tunedIn = true;
      channel.on('all', _partial(channelName));
      return this;
    },

// Stop logging all of the activities on this channel to the console
    tuneOut: function tuneOut(channelName) {
      var channel = Radio.channel(channelName);
      channel._tunedIn = false;
      channel.off('all', _partial(channelName));
      delete _logs[channelName];
      return this;
    }
  });

/*
   * Backbone.Radio.Requests
   * -----------------------
   * A messaging system for requesting data.
   *
   */

function makeCallback(callback) {
    return _.isFunction(callback) ? callback : function () {
      return callback;
    };
  }

Radio.Requests = {

// Make a request
    request: function request(name) {
      var args = _.rest(arguments);
      var results = Radio._eventsApi(this, 'request', name, args);
      if (results) {
        return results;
      }
      var channelName = this.channelName;
      var requests = this._requests;

// Check if we should log the request, and if so, do it
      if (channelName && this._tunedIn) {
        Radio.log.apply(this, [channelName, name].concat(args));
      }

// If the request isn't handled, log it in DEBUG mode and exit
      if (requests && (requests[name] || requests['default'])) {
        var handler = requests[name] || requests['default'];
        args = requests[name] ? args : arguments;
        return Radio._callHandler(handler.callback, handler.context, args);
      } else {
        Radio.debugLog('An unhandled request was fired', name, channelName);
      }
    },

// Set up a handler for a request
    reply: function reply(name, callback, context) {
      if (Radio._eventsApi(this, 'reply', name, [callback, context])) {
        return this;
      }

this._requests || (this._requests = {});

if (this._requests[name]) {
        Radio.debugLog('A request was overwritten', name, this.channelName);
      }

this._requests[name] = {
        callback: makeCallback(callback),
        context: context || this
      };

return this;
    },

// Set up a handler that can only be requested once
    replyOnce: function replyOnce(name, callback, context) {
      if (Radio._eventsApi(this, 'replyOnce', name, [callback, context])) {
        return this;
      }

var self = this;

var once = _.once(function () {
        self.stopReplying(name);
        return makeCallback(callback).apply(this, arguments);
      });

return this.reply(name, once, context);
    },

// Remove handler(s)
    stopReplying: function stopReplying(name, callback, context) {
      if (Radio._eventsApi(this, 'stopReplying', name)) {
        return this;
      }

// Remove everything if there are no arguments passed
      if (!name && !callback && !context) {
        delete this._requests;
      } else if (!removeHandlers(this._requests, name, callback, context)) {
        Radio.debugLog('Attempted to remove the unregistered request', name, this.channelName);
      }

return this;
    }
  };

/*
   * Backbone.Radio.channel
   * ----------------------
   * Get a reference to a channel by name.
   *
   */

Radio._channels = {};

Radio.channel = function (channelName) {
    if (!channelName) {
      throw new Error('You must provide a name for the channel.');
    }

if (Radio._channels[channelName]) {
      return Radio._channels[channelName];
    } else {
      return Radio._channels[channelName] = new Radio.Channel(channelName);
    }
  };

/*
   * Backbone.Radio.Channel
   * ----------------------
   * A Channel is an object that extends from Backbone.Events,
   * and Radio.Requests.
   *
   */

Radio.Channel = function (channelName) {
    this.channelName = channelName;
  };

_.extend(Radio.Channel.prototype, Backbone.Events, Radio.Requests, {

// Remove all handlers from the messaging systems of this channel
    reset: function reset() {
      this.off();
      this.stopListening();
      this.stopReplying();
      return this;
    }
  });

/*
   * Top-level API
   * -------------
   * Supplies the 'top-level API' for working with Channels directly
   * from Backbone.Radio.
   *
   */

var channel;
  var args;
  var systems = [Backbone.Events, Radio.Requests];
  _.each(systems, function (system) {
    _.each(system, function (method, methodName) {
      Radio[methodName] = function (channelName) {
        args = _.rest(arguments);
        channel = this.channel(channelName);
        return channel[methodName].apply(channel, args);
      };
    });
  });

Radio.reset = function (channelName) {
    var channels = !channelName ? this._channels : [this._channels[channelName]];
    _.invoke(channels, 'reset');
  };

return Radio;

}));

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