1/**
  2 * @output wp-includes/js/customize-base.js
  3 */
  4
  5/** @namespace wp */
  6window.wp = window.wp || {};
  7
  8(function( exports, $ ){
  9	var api = {}, ctor, inherits,
 10		slice = Array.prototype.slice;
 11
 12	// Shared empty constructor function to aid in prototype-chain creation.
 13	ctor = function() {};
 14
 15	/**
 16	 * Helper function to correctly set up the prototype chain, for subclasses.
 17	 * Similar to `goog.inherits`, but uses a hash of prototype properties and
 18	 * class properties to be extended.
 19	 *
 20	 * @param object parent      Parent class constructor to inherit from.
 21	 * @param object protoProps  Properties to apply to the prototype for use as class instance properties.
 22	 * @param object staticProps Properties to apply directly to the class constructor.
 23	 * @return child The subclassed constructor.
 24	 */
 25	inherits = function( parent, protoProps, staticProps ) {
 26		var child;
 27
 28		/*
 29		 * The constructor function for the new subclass is either defined by you
 30		 * (the "constructor" property in your `extend` definition), or defaulted
 31		 * by us to simply call `super()`.
 32		 */
 33		if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
 34			child = protoProps.constructor;
 35		} else {
 36			child = function() {
 37				/*
 38				 * Storing the result `super()` before returning the value
 39				 * prevents a bug in Opera where, if the constructor returns
 40				 * a function, Opera will reject the return value in favor of
 41				 * the original object. This causes all sorts of trouble.
 42				 */
 43				var result = parent.apply( this, arguments );
 44				return result;
 45			};
 46		}
 47
 48		// Inherit class (static) properties from parent.
 49		$.extend( child, parent );
 50
 51		// Set the prototype chain to inherit from `parent`,
 52		// without calling `parent`'s constructor function.
 53		ctor.prototype  = parent.prototype;
 54		child.prototype = new ctor();
 55
 56		// Add prototype properties (instance properties) to the subclass,
 57		// if supplied.
 58		if ( protoProps ) {
 59			$.extend( child.prototype, protoProps );
 60		}
 61
 62		// Add static properties to the constructor function, if supplied.
 63		if ( staticProps ) {
 64			$.extend( child, staticProps );
 65		}
 66
 67		// Correctly set child's `prototype.constructor`.
 68		child.prototype.constructor = child;
 69
 70		// Set a convenience property in case the parent's prototype is needed later.
 71		child.__super__ = parent.prototype;
 72
 73		return child;
 74	};
 75
 76	/**
 77	 * Base class for object inheritance.
 78	 */
 79	api.Class = function( applicator, argsArray, options ) {
 80		var magic, args = arguments;
 81
 82		if ( applicator && argsArray && api.Class.applicator === applicator ) {
 83			args = argsArray;
 84			$.extend( this, options || {} );
 85		}
 86
 87		magic = this;
 88
 89		/*
 90		 * If the class has a method called "instance",
 91		 * the return value from the class' constructor will be a function that
 92		 * calls the "instance" method.
 93		 *
 94		 * It is also an object that has properties and methods inside it.
 95		 */
 96		if ( this.instance ) {
 97			magic = function() {
 98				return magic.instance.apply( magic, arguments );
 99			};
100
101			$.extend( magic, this );
102		}
103
104		magic.initialize.apply( magic, args );
105		return magic;
106	};
107
108	/**
109	 * Creates a subclass of the class.
110	 *
111	 * @param object protoProps  Properties to apply to the prototype.
112	 * @param object staticProps Properties to apply directly to the class.
113	 * @return child The subclass.
114	 */
115	api.Class.extend = function( protoProps, staticProps ) {
116		var child = inherits( this, protoProps, staticProps );
117		child.extend = this.extend;
118		return child;
119	};
120
121	api.Class.applicator = {};
122
123	/**
124	 * Initialize a class instance.
125	 *
126	 * Override this function in a subclass as needed.
127	 */
128	api.Class.prototype.initialize = function() {};
129
130	/*
131	 * Checks whether a given instance extended a constructor.
132	 *
133	 * The magic surrounding the instance parameter causes the instanceof
134	 * keyword to return inaccurate results; it defaults to the function's
135	 * prototype instead of the constructor chain. Hence this function.
136	 */
137	api.Class.prototype.extended = function( constructor ) {
138		var proto = this;
139
140		while ( typeof proto.constructor !== 'undefined' ) {
141			if ( proto.constructor === constructor ) {
142				return true;
143			}
144			if ( typeof proto.constructor.__super__ === 'undefined' ) {
145				return false;
146			}
147			proto = proto.constructor.__super__;
148		}
149		return false;
150	};
151
152	/**
153	 * An events manager object, offering the ability to bind to and trigger events.
154	 *
155	 * Used as a mixin.
156	 */
157	api.Events = {
158		trigger: function( id ) {
159			if ( this.topics && this.topics[ id ] ) {
160				this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
161			}
162			return this;
163		},
164
165		bind: function( id ) {
166			this.topics = this.topics || {};
167			this.topics[ id ] = this.topics[ id ] || $.Callbacks();
168			this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
169			return this;
170		},
171
172		unbind: function( id ) {
173			if ( this.topics && this.topics[ id ] ) {
174				this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
175			}
176			return this;
177		}
178	};
179
180	/**
181	 * Observable values that support two-way binding.
182	 *
183	 * @memberOf wp.customize
184	 * @alias wp.customize.Value
185	 *
186	 * @constructor
187	 */
188	api.Value = api.Class.extend(/** @lends wp.customize.Value.prototype */{
189		/**
190		 * @param {mixed}  initial The initial value.
191		 * @param {Object} options
192		 */
193		initialize: function( initial, options ) {
194			this._value = initial; // @todo Potentially change this to a this.set() call.
195			this.callbacks = $.Callbacks();
196			this._dirty = false;
197
198			$.extend( this, options || {} );
199
200			this.set = this.set.bind( this );
201		},
202
203		/*
204		 * Magic. Returns a function that will become the instance.
205		 * Set to null to prevent the instance from extending a function.
206		 */
207		instance: function() {
208			return arguments.length ? this.set.apply( this, arguments ) : this.get();
209		},
210
211		/**
212		 * Get the value.
213		 *
214		 * @return {mixed}
215		 */
216		get: function() {
217			return this._value;
218		},
219
220		/**
221		 * Set the value and trigger all bound callbacks.
222		 *
223		 * @param {Object} to New value.
224		 */
225		set: function( to ) {
226			var from = this._value;
227
228			to = this._setter.apply( this, arguments );
229			to = this.validate( to );
230
231			// Bail if the sanitized value is null or unchanged.
232			if ( null === to || _.isEqual( from, to ) ) {
233				return this;
234			}
235
236			this._value = to;
237			this._dirty = true;
238
239			this.callbacks.fireWith( this, [ to, from ] );
240
241			return this;
242		},
243
244		_setter: function( to ) {
245			return to;
246		},
247
248		setter: function( callback ) {
249			var from = this.get();
250			this._setter = callback;
251			// Temporarily clear value so setter can decide if it's valid.
252			this._value = null;
253			this.set( from );
254			return this;
255		},
256
257		resetSetter: function() {
258			this._setter = this.constructor.prototype._setter;
259			this.set( this.get() );
260			return this;
261		},
262
263		validate: function( value ) {
264			return value;
265		},
266
267		/**
268		 * Bind a function to be invoked whenever the value changes.
269		 *
270		 * @param {...Function} A function, or multiple functions, to add to the callback stack.
271		 */
272		bind: function() {
273			this.callbacks.add.apply( this.callbacks, arguments );
274			return this;
275		},
276
277		/**
278		 * Unbind a previously bound function.
279		 *
280		 * @param {...Function} A function, or multiple functions, to remove from the callback stack.
281		 */
282		unbind: function() {
283			this.callbacks.remove.apply( this.callbacks, arguments );
284			return this;
285		},
286
287		link: function() { // values*
288			var set = this.set;
289			$.each( arguments, function() {
290				this.bind( set );
291			});
292			return this;
293		},
294
295		unlink: function() { // values*
296			var set = this.set;
297			$.each( arguments, function() {
298				this.unbind( set );
299			});
300			return this;
301		},
302
303		sync: function() { // values*
304			var that = this;
305			$.each( arguments, function() {
306				that.link( this );
307				this.link( that );
308			});
309			return this;
310		},
311
312		unsync: function() { // values*
313			var that = this;
314			$.each( arguments, function() {
315				that.unlink( this );
316				this.unlink( that );
317			});
318			return this;
319		}
320	});
321
322	/**
323	 * A collection of observable values.
324	 *
325	 * @memberOf wp.customize
326	 * @alias wp.customize.Values
327	 *
328	 * @constructor
329	 * @augments wp.customize.Class
330	 * @mixes wp.customize.Events
331	 */
332	api.Values = api.Class.extend(/** @lends wp.customize.Values.prototype */{
333
334		/**
335		 * The default constructor for items of the collection.
336		 *
337		 * @type {object}
338		 */
339		defaultConstructor: api.Value,
340
341		initialize: function( options ) {
342			$.extend( this, options || {} );
343
344			this._value = {};
345			this._deferreds = {};
346		},
347
348		/**
349		 * Get the instance of an item from the collection if only ID is specified.
350		 *
351		 * If more than one argument is supplied, all are expected to be IDs and
352		 * the last to be a function callback that will be invoked when the requested
353		 * items are available.
354		 *
355		 * @see {api.Values.when}
356		 *
357		 * @param {string} id ID of the item.
358		 * @param {...}       Zero or more IDs of items to wait for and a callback
359		 *                    function to invoke when they're available. Optional.
360		 * @return {mixed} The item instance if only one ID was supplied.
361		 *                 A Deferred Promise object if a callback function is supplied.
362		 */
363		instance: function( id ) {
364			if ( arguments.length === 1 ) {
365				return this.value( id );
366			}
367
368			return this.when.apply( this, arguments );
369		},
370
371		/**
372		 * Get the instance of an item.
373		 *
374		 * @param {string} id The ID of the item.
375		 * @return {[type]} [description]
376		 */
377		value: function( id ) {
378			return this._value[ id ];
379		},
380
381		/**
382		 * Whether the collection has an item with the given ID.
383		 *
384		 * @param {string} id The ID of the item to look for.
385		 * @return {boolean}
386		 */
387		has: function( id ) {
388			return typeof this._value[ id ] !== 'undefined';
389		},
390
391		/**
392		 * Add an item to the collection.
393		 *
394		 * @param {string|wp.customize.Class} item         - The item instance to add, or the ID for the instance to add.
395		 *                                                   When an ID string is supplied, then itemObject must be provided.
396		 * @param {wp.customize.Class}        [itemObject] - The item instance when the first argument is an ID string.
397		 * @return {wp.customize.Class} The new item's instance, or an existing instance if already added.
398		 */
399		add: function( item, itemObject ) {
400			var collection = this, id, instance;
401			if ( 'string' === typeof item ) {
402				id = item;
403				instance = itemObject;
404			} else {
405				if ( 'string' !== typeof item.id ) {
406					throw new Error( 'Unknown key' );
407				}
408				id = item.id;
409				instance = item;
410			}
411
412			if ( collection.has( id ) ) {
413				return collection.value( id );
414			}
415
416			collection._value[ id ] = instance;
417			instance.parent = collection;
418
419			// Propagate a 'change' event on an item up to the collection.
420			if ( instance.extended( api.Value ) ) {
421				instance.bind( collection._change );
422			}
423
424			collection.trigger( 'add', instance );
425
426			// If a deferred object exists for this item,
427			// resolve it.
428			if ( collection._deferreds[ id ] ) {
429				collection._deferreds[ id ].resolve();
430			}
431
432			return collection._value[ id ];
433		},
434
435		/**
436		 * Create a new item of the collection using the collection's default constructor
437		 * and store it in the collection.
438		 *
439		 * @param {string} id    The ID of the item.
440		 * @param {mixed}  value Any extra arguments are passed into the item's initialize method.
441		 * @return {mixed} The new item's instance.
442		 */
443		create: function( id ) {
444			return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
445		},
446
447		/**
448		 * Iterate over all items in the collection invoking the provided callback.
449		 *
450		 * @param {Function} callback Function to invoke.
451		 * @param {Object}   context  Object context to invoke the function with. Optional.
452		 */
453		each: function( callback, context ) {
454			context = typeof context === 'undefined' ? this : context;
455
456			$.each( this._value, function( key, obj ) {
457				callback.call( context, obj, key );
458			});
459		},
460
461		/**
462		 * Remove an item from the collection.
463		 *
464		 * @param {string} id The ID of the item to remove.
465		 */
466		remove: function( id ) {
467			var value = this.value( id );
468
469			if ( value ) {
470
471				// Trigger event right before the element is removed from the collection.
472				this.trigger( 'remove', value );
473
474				if ( value.extended( api.Value ) ) {
475					value.unbind( this._change );
476				}
477				delete value.parent;
478			}
479
480			delete this._value[ id ];
481			delete this._deferreds[ id ];
482
483			// Trigger removed event after the item has been eliminated from the collection.
484			if ( value ) {
485				this.trigger( 'removed', value );
486			}
487		},
488
489		/**
490		 * Runs a callback once all requested values exist.
491		 *
492		 * when( ids*, [callback] );
493		 *
494		 * For example:
495		 *     when( id1, id2, id3, function( value1, value2, value3 ) {} );
496		 *
497		 * @return $.Deferred.promise();
498		 */
499		when: function() {
500			var self = this,
501				ids  = slice.call( arguments ),
502				dfd  = $.Deferred();
503
504			// If the last argument is a callback, bind it to .done().
505			if ( typeof ids[ ids.length - 1 ] === 'function' ) {
506				dfd.done( ids.pop() );
507			}
508
509			/*
510			 * Create a stack of deferred objects for each item that is not
511			 * yet available, and invoke the supplied callback when they are.
512			 */
513			$.when.apply( $, $.map( ids, function( id ) {
514				if ( self.has( id ) ) {
515					return;
516				}
517
518				/*
519				 * The requested item is not available yet, create a deferred
520				 * object to resolve when it becomes available.
521				 */
522				return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
523			})).done( function() {
524				var values = $.map( ids, function( id ) {
525						return self( id );
526					});
527
528				// If a value is missing, we've used at least one expired deferred.
529				// Call Values.when again to generate a new deferred.
530				if ( values.length !== ids.length ) {
531					// ids.push( callback );
532					self.when.apply( self, ids ).done( function() {
533						dfd.resolveWith( self, values );
534					});
535					return;
536				}
537
538				dfd.resolveWith( self, values );
539			});
540
541			return dfd.promise();
542		},
543
544		/**
545		 * A helper function to propagate a 'change' event from an item
546		 * to the collection itself.
547		 */
548		_change: function() {
549			this.parent.trigger( 'change', this );
550		}
551	});
552
553	// Create a global events bus on the Customizer.
554	$.extend( api.Values.prototype, api.Events );
555
556
557	/**
558	 * Cast a string to a jQuery collection if it isn't already.
559	 *
560	 * @param {string|jQuery collection} element
561	 */
562	api.ensure = function( element ) {
563		return typeof element === 'string' ? $( element ) : element;
564	};
565
566	/**
567	 * An observable value that syncs with an element.
568	 *
569	 * Handles inputs, selects, and textareas by default.
570	 *
571	 * @memberOf wp.customize
572	 * @alias wp.customize.Element
573	 *
574	 * @constructor
575	 * @augments wp.customize.Value
576	 * @augments wp.customize.Class
577	 */
578	api.Element = api.Value.extend(/** @lends wp.customize.Element */{
579		initialize: function( element, options ) {
580			var self = this,
581				synchronizer = api.Element.synchronizer.html,
582				type, update, refresh;
583
584			this.element = api.ensure( element );
585			this.events = '';
586
587			if ( this.element.is( 'input, select, textarea' ) ) {
588				type = this.element.prop( 'type' );
589				this.events += ' change input';
590				synchronizer = api.Element.synchronizer.val;
591
592				if ( this.element.is( 'input' ) && api.Element.synchronizer[ type ] ) {
593					synchronizer = api.Element.synchronizer[ type ];
594				}
595			}
596
597			api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
598			this._value = this.get();
599
600			update = this.update;
601			refresh = this.refresh;
602
603			this.update = function( to ) {
604				if ( to !== refresh.call( self ) ) {
605					update.apply( this, arguments );
606				}
607			};
608			this.refresh = function() {
609				self.set( refresh.call( self ) );
610			};
611
612			this.bind( this.update );
613			this.element.on( this.events, this.refresh );
614		},
615
616		find: function( selector ) {
617			return $( selector, this.element );
618		},
619
620		refresh: function() {},
621
622		update: function() {}
623	});
624
625	api.Element.synchronizer = {};
626
627	$.each( [ 'html', 'val' ], function( index, method ) {
628		api.Element.synchronizer[ method ] = {
629			update: function( to ) {
630				this.element[ method ]( to );
631			},
632			refresh: function() {
633				return this.element[ method ]();
634			}
635		};
636	});
637
638	api.Element.synchronizer.checkbox = {
639		update: function( to ) {
640			this.element.prop( 'checked', to );
641		},
642		refresh: function() {
643			return this.element.prop( 'checked' );
644		}
645	};
646
647	api.Element.synchronizer.radio = {
648		update: function( to ) {
649			this.element.filter( function() {
650				return this.value === to;
651			}).prop( 'checked', true );
652		},
653		refresh: function() {
654			return this.element.filter( ':checked' ).val();
655		}
656	};
657
658	$.support.postMessage = !! window.postMessage;
659
660	/**
661	 * A communicator for sending data from one window to another over postMessage.
662	 *
663	 * @memberOf wp.customize
664	 * @alias wp.customize.Messenger
665	 *
666	 * @constructor
667	 * @augments wp.customize.Class
668	 * @mixes wp.customize.Events
669	 */
670	api.Messenger = api.Class.extend(/** @lends wp.customize.Messenger.prototype */{
671		/**
672		 * Create a new Value.
673		 *
674		 * @param {string} key     Unique identifier.
675		 * @param {mixed}  initial Initial value.
676		 * @param {mixed}  options Options hash. Optional.
677		 * @return {Value} Class instance of the Value.
678		 */
679		add: function( key, initial, options ) {
680			return this[ key ] = new api.Value( initial, options );
681		},
682
683		/**
684		 * Initialize Messenger.
685		 *
686		 * @param {Object} params  - Parameters to configure the messenger.
687		 *        {string} params.url          - The URL to communicate with.
688		 *        {window} params.targetWindow - The window instance to communicate with. Default window.parent.
689		 *        {string} params.channel      - If provided, will send the channel with each message and only accept messages a matching channel.
690		 * @param {Object} options - Extend any instance parameter or method with this object.
691		 */
692		initialize: function( params, options ) {
693			// Target the parent frame by default, but only if a parent frame exists.
694			var defaultTarget = window.parent === window ? null : window.parent;
695
696			$.extend( this, options || {} );
697
698			this.add( 'channel', params.channel );
699			this.add( 'url', params.url || '' );
700			this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
701				var urlParser = document.createElement( 'a' );
702				urlParser.href = to;
703				// Port stripping needed by IE since it adds to host but not to event.origin.
704				return urlParser.protocol + '//' + urlParser.host.replace( /:(80|443)$/, '' );
705			});
706
707			// First add with no value.
708			this.add( 'targetWindow', null );
709			// This avoids SecurityErrors when setting a window object in x-origin iframe'd scenarios.
710			this.targetWindow.set = function( to ) {
711				var from = this._value;
712
713				to = this._setter.apply( this, arguments );
714				to = this.validate( to );
715
716				if ( null === to || from === to ) {
717					return this;
718				}
719
720				this._value = to;
721				this._dirty = true;
722
723				this.callbacks.fireWith( this, [ to, from ] );
724
725				return this;
726			};
727			// Now set it.
728			this.targetWindow( params.targetWindow || defaultTarget );
729
730
731			/*
732			 * Since we want jQuery to treat the receive function as unique
733			 * to this instance, we give the function a new guid.
734			 *
735			 * This will prevent every Messenger's receive function from being
736			 * unbound when calling $.off( 'message', this.receive );
737			 */
738			this.receive = this.receive.bind( this );
739			this.receive.guid = $.guid++;
740
741			$( window ).on( 'message', this.receive );
742		},
743
744		destroy: function() {
745			$( window ).off( 'message', this.receive );
746		},
747
748		/**
749		 * Receive data from the other window.
750		 *
751		 * @param {jQuery.Event} event Event with embedded data.
752		 */
753		receive: function( event ) {
754			var message;
755
756			event = event.originalEvent;
757
758			if ( ! this.targetWindow || ! this.targetWindow() ) {
759				return;
760			}
761
762			// Check to make sure the origin is valid.
763			if ( this.origin() && event.origin !== this.origin() ) {
764				return;
765			}
766
767			// Ensure we have a string that's JSON.parse-able.
768			if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
769				return;
770			}
771
772			message = JSON.parse( event.data );
773
774			// Check required message properties.
775			if ( ! message || ! message.id || typeof message.data === 'undefined' ) {
776				return;
777			}
778
779			// Check if channel names match.
780			if ( ( message.channel || this.channel() ) && this.channel() !== message.channel ) {
781				return;
782			}
783
784			this.trigger( message.id, message.data );
785		},
786
787		/**
788		 * Send data to the other window.
789		 *
790		 * @param {string} id   The event name.
791		 * @param {Object} data Data.
792		 */
793		send: function( id, data ) {
794			var message;
795
796			data = typeof data === 'undefined' ? null : data;
797
798			if ( ! this.url() || ! this.targetWindow() ) {
799				return;
800			}
801
802			message = { id: id, data: data };
803			if ( this.channel() ) {
804				message.channel = this.channel();
805			}
806
807			this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
808		}
809	});
810
811	// Add the Events mixin to api.Messenger.
812	$.extend( api.Messenger.prototype, api.Events );
813
814	/**
815	 * Notification.
816	 *
817	 * @class
818	 * @augments wp.customize.Class
819	 * @since 4.6.0
820	 *
821	 * @memberOf wp.customize
822	 * @alias wp.customize.Notification
823	 *
824	 * @param {string}  code - The error code.
825	 * @param {object}  params - Params.
826	 * @param {string}  params.message=null - The error message.
827	 * @param {string}  [params.type=error] - The notification type.
828	 * @param {boolean} [params.fromServer=false] - Whether the notification was server-sent.
829	 * @param {string}  [params.setting=null] - The setting ID that the notification is related to.
830	 * @param {*}       [params.data=null] - Any additional data.
831	 */
832	api.Notification = api.Class.extend(/** @lends wp.customize.Notification.prototype */{
833
834		/**
835		 * Template function for rendering the notification.
836		 *
837		 * This will be populated with template option or else it will be populated with template from the ID.
838		 *
839		 * @since 4.9.0
840		 * @var {Function}
841		 */
842		template: null,
843
844		/**
845		 * ID for the template to render the notification.
846		 *
847		 * @since 4.9.0
848		 * @var {string}
849		 */
850		templateId: 'customize-notification',
851
852		/**
853		 * Additional class names to add to the notification container.
854		 *
855		 * @since 4.9.0
856		 * @var {string}
857		 */
858		containerClasses: '',
859
860		/**
861		 * Initialize notification.
862		 *
863		 * @since 4.9.0
864		 *
865		 * @param {string}   code - Notification code.
866		 * @param {Object}   params - Notification parameters.
867		 * @param {string}   params.message - Message.
868		 * @param {string}   [params.type=error] - Type.
869		 * @param {string}   [params.setting] - Related setting ID.
870		 * @param {Function} [params.template] - Function for rendering template. If not provided, this will come from templateId.
871		 * @param {string}   [params.templateId] - ID for template to render the notification.
872		 * @param {string}   [params.containerClasses] - Additional class names to add to the notification container.
873		 * @param {boolean}  [params.dismissible] - Whether the notification can be dismissed.
874		 */
875		initialize: function( code, params ) {
876			var _params;
877			this.code = code;
878			_params = _.extend(
879				{
880					message: null,
881					type: 'error',
882					fromServer: false,
883					data: null,
884					setting: null,
885					template: null,
886					dismissible: false,
887					containerClasses: ''
888				},
889				params
890			);
891			delete _params.code;
892			_.extend( this, _params );
893		},
894
895		/**
896		 * Render the notification.
897		 *
898		 * @since 4.9.0
899		 *
900		 * @return {jQuery} Notification container element.
901		 */
902		render: function() {
903			var notification = this, container, data;
904			if ( ! notification.template ) {
905				notification.template = wp.template( notification.templateId );
906			}
907			data = _.extend( {}, notification, {
908				alt: notification.parent && notification.parent.alt
909			} );
910			container = $( notification.template( data ) );
911
912			if ( notification.dismissible ) {
913				container.find( '.notice-dismiss' ).on( 'click keydown', function( event ) {
914					if ( 'keydown' === event.type && 13 !== event.which ) {
915						return;
916					}
917
918					if ( notification.parent ) {
919						notification.parent.remove( notification.code );
920					} else {
921						container.remove();
922					}
923				});
924			}
925
926			return container;
927		}
928	});
929
930	// The main API object is also a collection of all customizer settings.
931	api = $.extend( new api.Values(), api );
932
933	/**
934	 * Get all customize settings.
935	 *
936	 * @alias wp.customize.get
937	 *
938	 * @return {Object}
939	 */
940	api.get = function() {
941		var result = {};
942
943		this.each( function( obj, key ) {
944			result[ key ] = obj.get();
945		});
946
947		return result;
948	};
949
950	/**
951	 * Utility function namespace
952	 *
953	 * @namespace wp.customize.utils
954	 */
955	api.utils = {};
956
957	/**
958	 * Parse query string.
959	 *
960	 * @since 4.7.0
961	 * @access public
962	 *
963	 * @alias wp.customize.utils.parseQueryString
964	 *
965	 * @param {string} queryString Query string.
966	 * @return {Object} Parsed query string.
967	 */
968	api.utils.parseQueryString = function parseQueryString( queryString ) {
969		var queryParams = {};
970		_.each( queryString.split( '&' ), function( pair ) {
971			var parts, key, value;
972			parts = pair.split( '=', 2 );
973			if ( ! parts[0] ) {
974				return;
975			}
976			key = decodeURIComponent( parts[0].replace( /\+/g, ' ' ) );
977			key = key.replace( / /g, '_' ); // What PHP does.
978			if ( _.isUndefined( parts[1] ) ) {
979				value = null;
980			} else {
981				value = decodeURIComponent( parts[1].replace( /\+/g, ' ' ) );
982			}
983			queryParams[ key ] = value;
984		} );
985		return queryParams;
986	};
987
988	/**
989	 * Expose the API publicly on window.wp.customize
990	 *
991	 * @namespace wp.customize
992	 */
993	exports.customize = api;
994})( wp, jQuery );
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