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/**
 * Default settings for jQuery UI Autocomplete for use with non-hierarchical taxonomies.
 *
 * @output wp-admin/js/tags-suggest.js
 */
( function( $ ) {
	var tempID = 0;
	var separator = wp.i18n._x( ',', 'tag delimiter' ) || ',';
	var __ = wp.i18n.__,
	    _n = wp.i18n._n,
	    sprintf = wp.i18n.sprintf;

	function split( val ) {
		return val.split( new RegExp( separator + '\\s*' ) );
	}

	function getLast( term ) {
		return split( term ).pop();
	}

	/**
	 * Add UI Autocomplete to an input or textarea element with presets for use
	 * with non-hierarchical taxonomies.
	 *
	 * Example: `$( element ).wpTagsSuggest( options )`.
	 *
	 * The taxonomy can be passed in a `data-wp-taxonomy` attribute on the element or
	 * can be in `options.taxonomy`.
	 *
	 * @since 4.7.0
	 *
	 * @param {Object} options Options that are passed to UI Autocomplete. Can be used to override the default settings.
	 * @return {Object} jQuery instance.
	 */
	$.fn.wpTagsSuggest = function( options ) {
		var cache;
		var last;
		var $element = $( this );

		// Do not initialize if the element doesn't exist.
		if ( ! $element.length ) {
			return this;
		}

		options = options || {};

		var taxonomy = options.taxonomy || $element.attr( 'data-wp-taxonomy' ) || 'post_tag';

		delete( options.taxonomy );

		options = $.extend( {
			source: function( request, response ) {
				var term;

				if ( last === request.term ) {
					response( cache );
					return;
				}

				term = getLast( request.term );

				$.get( window.ajaxurl, {
					action: 'ajax-tag-search',
					tax: taxonomy,
					q: term,
					number: 20
				} ).always( function() {
					$element.removeClass( 'ui-autocomplete-loading' ); // UI fails to remove this sometimes?
				} ).done( function( data ) {
					var tagName;
					var tags = [];

					if ( data ) {
						data = data.split( '\n' );

						for ( tagName in data ) {
							var id = ++tempID;

							tags.push({
								id: id,
								name: data[tagName]
							});
						}

						cache = tags;
						response( tags );
					} else {
						response( tags );
					}
				} );

				last = request.term;
			},
			focus: function( event, ui ) {
				$element.attr( 'aria-activedescendant', 'wp-tags-autocomplete-' + ui.item.id );

				// Don't empty the input field when using the arrow keys
				// to highlight items. See api.jqueryui.com/autocomplete/#event-focus
				event.preventDefault();
			},
			select: function( event, ui ) {
				var tags = split( $element.val() );
				// Remove the last user input.
				tags.pop();
				// Append the new tag and an empty element to get one more separator at the end.
				tags.push( ui.item.name, '' );

				$element.val( tags.join( separator + ' ' ) );

				if ( $.ui.keyCode.TAB === event.keyCode ) {
					// Audible confirmation message when a tag has been selected.
					window.wp.a11y.speak( wp.i18n.__( 'Term selected.' ), 'assertive' );
					event.preventDefault();
				} else if ( $.ui.keyCode.ENTER === event.keyCode ) {
					// If we're in the edit post Tags meta box, add the tag.
					if ( window.tagBox ) {
						window.tagBox.userAction = 'add';
						window.tagBox.flushTags( $( this ).closest( '.tagsdiv' ) );
					}

					// Do not close Quick Edit / Bulk Edit.
					event.preventDefault();
					event.stopPropagation();
				}

				return false;
			},
			open: function() {
				$element.attr( 'aria-expanded', 'true' );
			},
			close: function() {
				$element.attr( 'aria-expanded', 'false' );
			},
			minLength: 2,
			position: {
				my: 'left top+2',
				at: 'left bottom',
				collision: 'none'
			},
			messages: {
				noResults: __( 'No results found.' ),
				results: function( number ) {
					return sprintf(
						/* translators: %d: Number of search results found. */
						_n(
							'%d result found. Use up and down arrow keys to navigate.',
							'%d results found. Use up and down arrow keys to navigate.',
							number
						),
						number
					);
				}
			}
		}, options );

		$element.on( 'keydown', function() {
			$element.removeAttr( 'aria-activedescendant' );
		} );

		$element.autocomplete( options );

		// Ensure the autocomplete instance exists.
		if ( ! $element.autocomplete( 'instance' ) ) {
			return this;
		}

		$element.autocomplete( 'instance' )._renderItem = function( ul, item ) {
			return $( '<li role="option" id="wp-tags-autocomplete-' + item.id + '">' )
				.text( item.name )
				.appendTo( ul );
		};

		$element.attr( {
			'role': 'combobox',
			'aria-autocomplete': 'list',
			'aria-expanded': 'false',
			'aria-owns': $element.autocomplete( 'widget' ).attr( 'id' )
		} )
		.on( 'focus', function() {
			var inputValue = split( $element.val() ).pop();

			// Don't trigger a search if the field is empty.
			// Also, avoids screen readers announce `No search results`.
			if ( inputValue ) {
				$element.autocomplete( 'search' );
			}
		} );

		// Returns a jQuery object containing the menu element.
		$element.autocomplete( 'widget' )
			.addClass( 'wp-tags-autocomplete' )
			.attr( 'role', 'listbox' )
			.removeAttr( 'tabindex' ) // Remove the `tabindex=0` attribute added by jQuery UI.

			/*
			 * Looks like Safari and VoiceOver need an `aria-selected` attribute. See ticket #33301.
			 * The `menufocus` and `menublur` events are the same events used to add and remove
			 * the `ui-state-focus` CSS class on the menu items. See jQuery UI Menu Widget.
			 */
			.on( 'menufocus', function( event, ui ) {
				ui.item.attr( 'aria-selected', 'true' );
			})
			.on( 'menublur', function() {
				// The `menublur` event returns an object where the item is `null`,
				// so we need to find the active item with other means.
				$( this ).find( '[aria-selected="true"]' ).removeAttr( 'aria-selected' );
			});

		return this;
	};

}( jQuery ) );
