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/**
 * @output wp-includes/js/customize-base.js
 */

/** @namespace wp */
window.wp = window.wp || {};

(function( exports, $ ){
	var api = {}, ctor, inherits,
		slice = Array.prototype.slice;

// Shared empty constructor function to aid in prototype-chain creation.
	ctor = function() {};

/**
	 * Helper function to correctly set up the prototype chain, for subclasses.
	 * Similar to `goog.inherits`, but uses a hash of prototype properties and
	 * class properties to be extended.
	 *
	 * @param object parent      Parent class constructor to inherit from.
	 * @param object protoProps  Properties to apply to the prototype for use as class instance properties.
	 * @param object staticProps Properties to apply directly to the class constructor.
	 * @return child The subclassed constructor.
	 */
	inherits = function( parent, protoProps, staticProps ) {
		var child;

/*
		 * The constructor function for the new subclass is either defined by you
		 * (the "constructor" property in your `extend` definition), or defaulted
		 * by us to simply call `super()`.
		 */
		if ( protoProps && protoProps.hasOwnProperty( 'constructor' ) ) {
			child = protoProps.constructor;
		} else {
			child = function() {
				/*
				 * Storing the result `super()` before returning the value
				 * prevents a bug in Opera where, if the constructor returns
				 * a function, Opera will reject the return value in favor of
				 * the original object. This causes all sorts of trouble.
				 */
				var result = parent.apply( this, arguments );
				return result;
			};
		}

// Inherit class (static) properties from parent.
		$.extend( child, parent );

// Set the prototype chain to inherit from `parent`,
		// without calling `parent`'s constructor function.
		ctor.prototype  = parent.prototype;
		child.prototype = new ctor();

// Add prototype properties (instance properties) to the subclass,
		// if supplied.
		if ( protoProps ) {
			$.extend( child.prototype, protoProps );
		}

// Add static properties to the constructor function, if supplied.
		if ( staticProps ) {
			$.extend( child, staticProps );
		}

// Correctly set child's `prototype.constructor`.
		child.prototype.constructor = child;

// Set a convenience property in case the parent's prototype is needed later.
		child.__super__ = parent.prototype;

return child;
	};

/**
	 * Base class for object inheritance.
	 */
	api.Class = function( applicator, argsArray, options ) {
		var magic, args = arguments;

if ( applicator && argsArray && api.Class.applicator === applicator ) {
			args = argsArray;
			$.extend( this, options || {} );
		}

magic = this;

/*
		 * If the class has a method called "instance",
		 * the return value from the class' constructor will be a function that
		 * calls the "instance" method.
		 *
		 * It is also an object that has properties and methods inside it.
		 */
		if ( this.instance ) {
			magic = function() {
				return magic.instance.apply( magic, arguments );
			};

$.extend( magic, this );
		}

magic.initialize.apply( magic, args );
		return magic;
	};

/**
	 * Creates a subclass of the class.
	 *
	 * @param object protoProps  Properties to apply to the prototype.
	 * @param object staticProps Properties to apply directly to the class.
	 * @return child The subclass.
	 */
	api.Class.extend = function( protoProps, staticProps ) {
		var child = inherits( this, protoProps, staticProps );
		child.extend = this.extend;
		return child;
	};

api.Class.applicator = {};

/**
	 * Initialize a class instance.
	 *
	 * Override this function in a subclass as needed.
	 */
	api.Class.prototype.initialize = function() {};

/*
	 * Checks whether a given instance extended a constructor.
	 *
	 * The magic surrounding the instance parameter causes the instanceof
	 * keyword to return inaccurate results; it defaults to the function's
	 * prototype instead of the constructor chain. Hence this function.
	 */
	api.Class.prototype.extended = function( constructor ) {
		var proto = this;

while ( typeof proto.constructor !== 'undefined' ) {
			if ( proto.constructor === constructor ) {
				return true;
			}
			if ( typeof proto.constructor.__super__ === 'undefined' ) {
				return false;
			}
			proto = proto.constructor.__super__;
		}
		return false;
	};

/**
	 * An events manager object, offering the ability to bind to and trigger events.
	 *
	 * Used as a mixin.
	 */
	api.Events = {
		trigger: function( id ) {
			if ( this.topics && this.topics[ id ] ) {
				this.topics[ id ].fireWith( this, slice.call( arguments, 1 ) );
			}
			return this;
		},

bind: function( id ) {
			this.topics = this.topics || {};
			this.topics[ id ] = this.topics[ id ] || $.Callbacks();
			this.topics[ id ].add.apply( this.topics[ id ], slice.call( arguments, 1 ) );
			return this;
		},

unbind: function( id ) {
			if ( this.topics && this.topics[ id ] ) {
				this.topics[ id ].remove.apply( this.topics[ id ], slice.call( arguments, 1 ) );
			}
			return this;
		}
	};

/**
	 * Observable values that support two-way binding.
	 *
	 * @memberOf wp.customize
	 * @alias wp.customize.Value
	 *
	 * @constructor
	 */
	api.Value = api.Class.extend(/** @lends wp.customize.Value.prototype */{
		/**
		 * @param {mixed}  initial The initial value.
		 * @param {Object} options
		 */
		initialize: function( initial, options ) {
			this._value = initial; // @todo Potentially change this to a this.set() call.
			this.callbacks = $.Callbacks();
			this._dirty = false;

$.extend( this, options || {} );

this.set = this.set.bind( this );
		},

/*
		 * Magic. Returns a function that will become the instance.
		 * Set to null to prevent the instance from extending a function.
		 */
		instance: function() {
			return arguments.length ? this.set.apply( this, arguments ) : this.get();
		},

/**
		 * Get the value.
		 *
		 * @return {mixed}
		 */
		get: function() {
			return this._value;
		},

/**
		 * Set the value and trigger all bound callbacks.
		 *
		 * @param {Object} to New value.
		 */
		set: function( to ) {
			var from = this._value;

to = this._setter.apply( this, arguments );
			to = this.validate( to );

// Bail if the sanitized value is null or unchanged.
			if ( null === to || _.isEqual( from, to ) ) {
				return this;
			}

this._value = to;
			this._dirty = true;

this.callbacks.fireWith( this, [ to, from ] );

return this;
		},

_setter: function( to ) {
			return to;
		},

setter: function( callback ) {
			var from = this.get();
			this._setter = callback;
			// Temporarily clear value so setter can decide if it's valid.
			this._value = null;
			this.set( from );
			return this;
		},

resetSetter: function() {
			this._setter = this.constructor.prototype._setter;
			this.set( this.get() );
			return this;
		},

validate: function( value ) {
			return value;
		},

/**
		 * Bind a function to be invoked whenever the value changes.
		 *
		 * @param {...Function} A function, or multiple functions, to add to the callback stack.
		 */
		bind: function() {
			this.callbacks.add.apply( this.callbacks, arguments );
			return this;
		},

/**
		 * Unbind a previously bound function.
		 *
		 * @param {...Function} A function, or multiple functions, to remove from the callback stack.
		 */
		unbind: function() {
			this.callbacks.remove.apply( this.callbacks, arguments );
			return this;
		},

link: function() { // values*
			var set = this.set;
			$.each( arguments, function() {
				this.bind( set );
			});
			return this;
		},

unlink: function() { // values*
			var set = this.set;
			$.each( arguments, function() {
				this.unbind( set );
			});
			return this;
		},

sync: function() { // values*
			var that = this;
			$.each( arguments, function() {
				that.link( this );
				this.link( that );
			});
			return this;
		},

unsync: function() { // values*
			var that = this;
			$.each( arguments, function() {
				that.unlink( this );
				this.unlink( that );
			});
			return this;
		}
	});

/**
	 * A collection of observable values.
	 *
	 * @memberOf wp.customize
	 * @alias wp.customize.Values
	 *
	 * @constructor
	 * @augments wp.customize.Class
	 * @mixes wp.customize.Events
	 */
	api.Values = api.Class.extend(/** @lends wp.customize.Values.prototype */{

/**
		 * The default constructor for items of the collection.
		 *
		 * @type {object}
		 */
		defaultConstructor: api.Value,

initialize: function( options ) {
			$.extend( this, options || {} );

this._value = {};
			this._deferreds = {};
		},

/**
		 * Get the instance of an item from the collection if only ID is specified.
		 *
		 * If more than one argument is supplied, all are expected to be IDs and
		 * the last to be a function callback that will be invoked when the requested
		 * items are available.
		 *
		 * @see {api.Values.when}
		 *
		 * @param {string} id ID of the item.
		 * @param {...}       Zero or more IDs of items to wait for and a callback
		 *                    function to invoke when they're available. Optional.
		 * @return {mixed} The item instance if only one ID was supplied.
		 *                 A Deferred Promise object if a callback function is supplied.
		 */
		instance: function( id ) {
			if ( arguments.length === 1 ) {
				return this.value( id );
			}

return this.when.apply( this, arguments );
		},

/**
		 * Get the instance of an item.
		 *
		 * @param {string} id The ID of the item.
		 * @return {[type]} [description]
		 */
		value: function( id ) {
			return this._value[ id ];
		},

/**
		 * Whether the collection has an item with the given ID.
		 *
		 * @param {string} id The ID of the item to look for.
		 * @return {boolean}
		 */
		has: function( id ) {
			return typeof this._value[ id ] !== 'undefined';
		},

/**
		 * Add an item to the collection.
		 *
		 * @param {string|wp.customize.Class} item         - The item instance to add, or the ID for the instance to add.
		 *                                                   When an ID string is supplied, then itemObject must be provided.
		 * @param {wp.customize.Class}        [itemObject] - The item instance when the first argument is an ID string.
		 * @return {wp.customize.Class} The new item's instance, or an existing instance if already added.
		 */
		add: function( item, itemObject ) {
			var collection = this, id, instance;
			if ( 'string' === typeof item ) {
				id = item;
				instance = itemObject;
			} else {
				if ( 'string' !== typeof item.id ) {
					throw new Error( 'Unknown key' );
				}
				id = item.id;
				instance = item;
			}

if ( collection.has( id ) ) {
				return collection.value( id );
			}

collection._value[ id ] = instance;
			instance.parent = collection;

// Propagate a 'change' event on an item up to the collection.
			if ( instance.extended( api.Value ) ) {
				instance.bind( collection._change );
			}

collection.trigger( 'add', instance );

// If a deferred object exists for this item,
			// resolve it.
			if ( collection._deferreds[ id ] ) {
				collection._deferreds[ id ].resolve();
			}

return collection._value[ id ];
		},

/**
		 * Create a new item of the collection using the collection's default constructor
		 * and store it in the collection.
		 *
		 * @param {string} id    The ID of the item.
		 * @param {mixed}  value Any extra arguments are passed into the item's initialize method.
		 * @return {mixed} The new item's instance.
		 */
		create: function( id ) {
			return this.add( id, new this.defaultConstructor( api.Class.applicator, slice.call( arguments, 1 ) ) );
		},

/**
		 * Iterate over all items in the collection invoking the provided callback.
		 *
		 * @param {Function} callback Function to invoke.
		 * @param {Object}   context  Object context to invoke the function with. Optional.
		 */
		each: function( callback, context ) {
			context = typeof context === 'undefined' ? this : context;

$.each( this._value, function( key, obj ) {
				callback.call( context, obj, key );
			});
		},

/**
		 * Remove an item from the collection.
		 *
		 * @param {string} id The ID of the item to remove.
		 */
		remove: function( id ) {
			var value = this.value( id );

if ( value ) {

// Trigger event right before the element is removed from the collection.
				this.trigger( 'remove', value );

if ( value.extended( api.Value ) ) {
					value.unbind( this._change );
				}
				delete value.parent;
			}

delete this._value[ id ];
			delete this._deferreds[ id ];

// Trigger removed event after the item has been eliminated from the collection.
			if ( value ) {
				this.trigger( 'removed', value );
			}
		},

/**
		 * Runs a callback once all requested values exist.
		 *
		 * when( ids*, [callback] );
		 *
		 * For example:
		 *     when( id1, id2, id3, function( value1, value2, value3 ) {} );
		 *
		 * @return $.Deferred.promise();
		 */
		when: function() {
			var self = this,
				ids  = slice.call( arguments ),
				dfd  = $.Deferred();

// If the last argument is a callback, bind it to .done().
			if ( typeof ids[ ids.length - 1 ] === 'function' ) {
				dfd.done( ids.pop() );
			}

/*
			 * Create a stack of deferred objects for each item that is not
			 * yet available, and invoke the supplied callback when they are.
			 */
			$.when.apply( $, $.map( ids, function( id ) {
				if ( self.has( id ) ) {
					return;
				}

/*
				 * The requested item is not available yet, create a deferred
				 * object to resolve when it becomes available.
				 */
				return self._deferreds[ id ] = self._deferreds[ id ] || $.Deferred();
			})).done( function() {
				var values = $.map( ids, function( id ) {
						return self( id );
					});

// If a value is missing, we've used at least one expired deferred.
				// Call Values.when again to generate a new deferred.
				if ( values.length !== ids.length ) {
					// ids.push( callback );
					self.when.apply( self, ids ).done( function() {
						dfd.resolveWith( self, values );
					});
					return;
				}

dfd.resolveWith( self, values );
			});

return dfd.promise();
		},

/**
		 * A helper function to propagate a 'change' event from an item
		 * to the collection itself.
		 */
		_change: function() {
			this.parent.trigger( 'change', this );
		}
	});

// Create a global events bus on the Customizer.
	$.extend( api.Values.prototype, api.Events );

/**
	 * Cast a string to a jQuery collection if it isn't already.
	 *
	 * @param {string|jQuery collection} element
	 */
	api.ensure = function( element ) {
		return typeof element === 'string' ? $( element ) : element;
	};

/**
	 * An observable value that syncs with an element.
	 *
	 * Handles inputs, selects, and textareas by default.
	 *
	 * @memberOf wp.customize
	 * @alias wp.customize.Element
	 *
	 * @constructor
	 * @augments wp.customize.Value
	 * @augments wp.customize.Class
	 */
	api.Element = api.Value.extend(/** @lends wp.customize.Element */{
		initialize: function( element, options ) {
			var self = this,
				synchronizer = api.Element.synchronizer.html,
				type, update, refresh;

this.element = api.ensure( element );
			this.events = '';

if ( this.element.is( 'input, select, textarea' ) ) {
				type = this.element.prop( 'type' );
				this.events += ' change input';
				synchronizer = api.Element.synchronizer.val;

if ( this.element.is( 'input' ) && api.Element.synchronizer[ type ] ) {
					synchronizer = api.Element.synchronizer[ type ];
				}
			}

api.Value.prototype.initialize.call( this, null, $.extend( options || {}, synchronizer ) );
			this._value = this.get();

update = this.update;
			refresh = this.refresh;

this.update = function( to ) {
				if ( to !== refresh.call( self ) ) {
					update.apply( this, arguments );
				}
			};
			this.refresh = function() {
				self.set( refresh.call( self ) );
			};

this.bind( this.update );
			this.element.on( this.events, this.refresh );
		},

find: function( selector ) {
			return $( selector, this.element );
		},

refresh: function() {},

update: function() {}
	});

api.Element.synchronizer = {};

$.each( [ 'html', 'val' ], function( index, method ) {
		api.Element.synchronizer[ method ] = {
			update: function( to ) {
				this.element[ method ]( to );
			},
			refresh: function() {
				return this.element[ method ]();
			}
		};
	});

api.Element.synchronizer.checkbox = {
		update: function( to ) {
			this.element.prop( 'checked', to );
		},
		refresh: function() {
			return this.element.prop( 'checked' );
		}
	};

api.Element.synchronizer.radio = {
		update: function( to ) {
			this.element.filter( function() {
				return this.value === to;
			}).prop( 'checked', true );
		},
		refresh: function() {
			return this.element.filter( ':checked' ).val();
		}
	};

$.support.postMessage = !! window.postMessage;

/**
	 * A communicator for sending data from one window to another over postMessage.
	 *
	 * @memberOf wp.customize
	 * @alias wp.customize.Messenger
	 *
	 * @constructor
	 * @augments wp.customize.Class
	 * @mixes wp.customize.Events
	 */
	api.Messenger = api.Class.extend(/** @lends wp.customize.Messenger.prototype */{
		/**
		 * Create a new Value.
		 *
		 * @param {string} key     Unique identifier.
		 * @param {mixed}  initial Initial value.
		 * @param {mixed}  options Options hash. Optional.
		 * @return {Value} Class instance of the Value.
		 */
		add: function( key, initial, options ) {
			return this[ key ] = new api.Value( initial, options );
		},

/**
		 * Initialize Messenger.
		 *
		 * @param {Object} params  - Parameters to configure the messenger.
		 *        {string} params.url          - The URL to communicate with.
		 *        {window} params.targetWindow - The window instance to communicate with. Default window.parent.
		 *        {string} params.channel      - If provided, will send the channel with each message and only accept messages a matching channel.
		 * @param {Object} options - Extend any instance parameter or method with this object.
		 */
		initialize: function( params, options ) {
			// Target the parent frame by default, but only if a parent frame exists.
			var defaultTarget = window.parent === window ? null : window.parent;

$.extend( this, options || {} );

this.add( 'channel', params.channel );
			this.add( 'url', params.url || '' );
			this.add( 'origin', this.url() ).link( this.url ).setter( function( to ) {
				var urlParser = document.createElement( 'a' );
				urlParser.href = to;
				// Port stripping needed by IE since it adds to host but not to event.origin.
				return urlParser.protocol + '//' + urlParser.host.replace( /:(80|443)$/, '' );
			});

// First add with no value.
			this.add( 'targetWindow', null );
			// This avoids SecurityErrors when setting a window object in x-origin iframe'd scenarios.
			this.targetWindow.set = function( to ) {
				var from = this._value;

to = this._setter.apply( this, arguments );
				to = this.validate( to );

if ( null === to || from === to ) {
					return this;
				}

this._value = to;
				this._dirty = true;

this.callbacks.fireWith( this, [ to, from ] );

return this;
			};
			// Now set it.
			this.targetWindow( params.targetWindow || defaultTarget );

/*
			 * Since we want jQuery to treat the receive function as unique
			 * to this instance, we give the function a new guid.
			 *
			 * This will prevent every Messenger's receive function from being
			 * unbound when calling $.off( 'message', this.receive );
			 */
			this.receive = this.receive.bind( this );
			this.receive.guid = $.guid++;

$( window ).on( 'message', this.receive );
		},

destroy: function() {
			$( window ).off( 'message', this.receive );
		},

/**
		 * Receive data from the other window.
		 *
		 * @param {jQuery.Event} event Event with embedded data.
		 */
		receive: function( event ) {
			var message;

event = event.originalEvent;

if ( ! this.targetWindow || ! this.targetWindow() ) {
				return;
			}

// Check to make sure the origin is valid.
			if ( this.origin() && event.origin !== this.origin() ) {
				return;
			}

// Ensure we have a string that's JSON.parse-able.
			if ( typeof event.data !== 'string' || event.data[0] !== '{' ) {
				return;
			}

message = JSON.parse( event.data );

// Check required message properties.
			if ( ! message || ! message.id || typeof message.data === 'undefined' ) {
				return;
			}

// Check if channel names match.
			if ( ( message.channel || this.channel() ) && this.channel() !== message.channel ) {
				return;
			}

this.trigger( message.id, message.data );
		},

/**
		 * Send data to the other window.
		 *
		 * @param {string} id   The event name.
		 * @param {Object} data Data.
		 */
		send: function( id, data ) {
			var message;

data = typeof data === 'undefined' ? null : data;

if ( ! this.url() || ! this.targetWindow() ) {
				return;
			}

message = { id: id, data: data };
			if ( this.channel() ) {
				message.channel = this.channel();
			}

this.targetWindow().postMessage( JSON.stringify( message ), this.origin() );
		}
	});

// Add the Events mixin to api.Messenger.
	$.extend( api.Messenger.prototype, api.Events );

/**
	 * Notification.
	 *
	 * @class
	 * @augments wp.customize.Class
	 * @since 4.6.0
	 *
	 * @memberOf wp.customize
	 * @alias wp.customize.Notification
	 *
	 * @param {string}  code - The error code.
	 * @param {object}  params - Params.
	 * @param {string}  params.message=null - The error message.
	 * @param {string}  [params.type=error] - The notification type.
	 * @param {boolean} [params.fromServer=false] - Whether the notification was server-sent.
	 * @param {string}  [params.setting=null] - The setting ID that the notification is related to.
	 * @param {*}       [params.data=null] - Any additional data.
	 */
	api.Notification = api.Class.extend(/** @lends wp.customize.Notification.prototype */{

/**
		 * Template function for rendering the notification.
		 *
		 * This will be populated with template option or else it will be populated with template from the ID.
		 *
		 * @since 4.9.0
		 * @var {Function}
		 */
		template: null,

/**
		 * ID for the template to render the notification.
		 *
		 * @since 4.9.0
		 * @var {string}
		 */
		templateId: 'customize-notification',

/**
		 * Additional class names to add to the notification container.
		 *
		 * @since 4.9.0
		 * @var {string}
		 */
		containerClasses: '',

/**
		 * Initialize notification.
		 *
		 * @since 4.9.0
		 *
		 * @param {string}   code - Notification code.
		 * @param {Object}   params - Notification parameters.
		 * @param {string}   params.message - Message.
		 * @param {string}   [params.type=error] - Type.
		 * @param {string}   [params.setting] - Related setting ID.
		 * @param {Function} [params.template] - Function for rendering template. If not provided, this will come from templateId.
		 * @param {string}   [params.templateId] - ID for template to render the notification.
		 * @param {string}   [params.containerClasses] - Additional class names to add to the notification container.
		 * @param {boolean}  [params.dismissible] - Whether the notification can be dismissed.
		 */
		initialize: function( code, params ) {
			var _params;
			this.code = code;
			_params = _.extend(
				{
					message: null,
					type: 'error',
					fromServer: false,
					data: null,
					setting: null,
					template: null,
					dismissible: false,
					containerClasses: ''
				},
				params
			);
			delete _params.code;
			_.extend( this, _params );
		},

/**
		 * Render the notification.
		 *
		 * @since 4.9.0
		 *
		 * @return {jQuery} Notification container element.
		 */
		render: function() {
			var notification = this, container, data;
			if ( ! notification.template ) {
				notification.template = wp.template( notification.templateId );
			}
			data = _.extend( {}, notification, {
				alt: notification.parent && notification.parent.alt
			} );
			container = $( notification.template( data ) );

if ( notification.dismissible ) {
				container.find( '.notice-dismiss' ).on( 'click keydown', function( event ) {
					if ( 'keydown' === event.type && 13 !== event.which ) {
						return;
					}

if ( notification.parent ) {
						notification.parent.remove( notification.code );
					} else {
						container.remove();
					}
				});
			}

return container;
		}
	});

// The main API object is also a collection of all customizer settings.
	api = $.extend( new api.Values(), api );

/**
	 * Get all customize settings.
	 *
	 * @alias wp.customize.get
	 *
	 * @return {Object}
	 */
	api.get = function() {
		var result = {};

this.each( function( obj, key ) {
			result[ key ] = obj.get();
		});

return result;
	};

/**
	 * Utility function namespace
	 *
	 * @namespace wp.customize.utils
	 */
	api.utils = {};

/**
	 * Parse query string.
	 *
	 * @since 4.7.0
	 * @access public
	 *
	 * @alias wp.customize.utils.parseQueryString
	 *
	 * @param {string} queryString Query string.
	 * @return {Object} Parsed query string.
	 */
	api.utils.parseQueryString = function parseQueryString( queryString ) {
		var queryParams = {};
		_.each( queryString.split( '&' ), function( pair ) {
			var parts, key, value;
			parts = pair.split( '=', 2 );
			if ( ! parts[0] ) {
				return;
			}
			key = decodeURIComponent( parts[0].replace( /\+/g, ' ' ) );
			key = key.replace( / /g, '_' ); // What PHP does.
			if ( _.isUndefined( parts[1] ) ) {
				value = null;
			} else {
				value = decodeURIComponent( parts[1].replace( /\+/g, ' ' ) );
			}
			queryParams[ key ] = value;
		} );
		return queryParams;
	};

/**
	 * Expose the API publicly on window.wp.customize
	 *
	 * @namespace wp.customize
	 */
	exports.customize = api;
})( wp, jQuery );

Editing: customize-base.js

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