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/**
 * Nav Menu API: Walker_Nav_Menu class
 *
 * @package WordPress
 * @subpackage Nav_Menus
 * @since 4.6.0
 */

/**
 * Core class used to implement an HTML list of nav menu items.
 *
 * @since 3.0.0
 *
 * @see Walker
 */
class Walker_Nav_Menu extends Walker {
	/**
	 * What the class handles.
	 *
	 * @since 3.0.0
	 * @var string
	 *
	 * @see Walker::$tree_type
	 */
	public $tree_type = array( 'post_type', 'taxonomy', 'custom' );

	/**
	 * Database fields to use.
	 *
	 * @since 3.0.0
	 * @todo Decouple this.
	 * @var string[]
	 *
	 * @see Walker::$db_fields
	 */
	public $db_fields = array(
		'parent' =&gt; 'menu_item_parent',
		'id'     =&gt; 'db_id',
	);

	/**
	 * Starts the list before the elements are added.
	 *
	 * @since 3.0.0
	 *
	 * @see Walker::start_lvl()
	 *
	 * @param string   $output Used to append additional content (passed by reference).
	 * @param int      $depth  Depth of menu item. Used for padding.
	 * @param stdClass $args   An object of wp_nav_menu() arguments.
	 */
	public function start_lvl( &amp;$output, $depth = 0, $args = null ) {
		if ( isset( $args-&gt;item_spacing ) &amp;&amp; 'discard' === $args-&gt;item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = &quot;\t&quot;;
			$n = &quot;\n&quot;;
		}
		$indent = str_repeat( $t, $depth );

		// Default class.
		$classes = array( 'sub-menu' );

		/**
		 * Filters the CSS class(es) applied to a menu list element.
		 *
		 * @since 4.8.0
		 *
		 * @param string[] $classes Array of the CSS classes that are applied to the menu `&lt;ul&gt;` element.
		 * @param stdClass $args    An object of `wp_nav_menu()` arguments.
		 * @param int      $depth   Depth of menu item. Used for padding.
		 */
		$class_names = implode( ' ', apply_filters( 'nav_menu_submenu_css_class', $classes, $args, $depth ) );
		$class_names = $class_names ? ' class=&quot;' . esc_attr( $class_names ) . '&quot;' : '';

		$output .= &quot;{$n}{$indent}&lt;ul$class_names&gt;{$n}&quot;;
	}

	/**
	 * Ends the list of after the elements are added.
	 *
	 * @since 3.0.0
	 *
	 * @see Walker::end_lvl()
	 *
	 * @param string   $output Used to append additional content (passed by reference).
	 * @param int      $depth  Depth of menu item. Used for padding.
	 * @param stdClass $args   An object of wp_nav_menu() arguments.
	 */
	public function end_lvl( &amp;$output, $depth = 0, $args = null ) {
		if ( isset( $args-&gt;item_spacing ) &amp;&amp; 'discard' === $args-&gt;item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = &quot;\t&quot;;
			$n = &quot;\n&quot;;
		}
		$indent  = str_repeat( $t, $depth );
		$output .= &quot;$indent&lt;/ul&gt;{$n}&quot;;
	}

	/**
	 * Starts the element output.
	 *
	 * @since 3.0.0
	 * @since 4.4.0 The {@see 'nav_menu_item_args'} filter was added.
	 * @since 5.9.0 Renamed `$item` to `$data_object` and `$id` to `$current_object_id`
	 *              to match parent class for PHP 8 named parameter support.
	 *
	 * @see Walker::start_el()
	 *
	 * @param string   $output            Used to append additional content (passed by reference).
	 * @param WP_Post  $data_object       Menu item data object.
	 * @param int      $depth             Depth of menu item. Used for padding.
	 * @param stdClass $args              An object of wp_nav_menu() arguments.
	 * @param int      $current_object_id Optional. ID of the current menu item. Default 0.
	 */
	public function start_el( &amp;$output, $data_object, $depth = 0, $args = null, $current_object_id = 0 ) {
		// Restores the more descriptive, specific name for use within this method.
		$menu_item = $data_object;

		if ( isset( $args-&gt;item_spacing ) &amp;&amp; 'discard' === $args-&gt;item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = &quot;\t&quot;;
			$n = &quot;\n&quot;;
		}
		$indent = ( $depth ) ? str_repeat( $t, $depth ) : '';

		$classes   = empty( $menu_item-&gt;classes ) ? array() : (array) $menu_item-&gt;classes;
		$classes[] = 'menu-item-' . $menu_item-&gt;ID;

		/**
		 * Filters the arguments for a single nav menu item.
		 *
		 * @since 4.4.0
		 *
		 * @param stdClass $args      An object of wp_nav_menu() arguments.
		 * @param WP_Post  $menu_item Menu item data object.
		 * @param int      $depth     Depth of menu item. Used for padding.
		 */
		$args = apply_filters( 'nav_menu_item_args', $args, $menu_item, $depth );

		/**
		 * Filters the CSS classes applied to a menu item's list item element.
		 *
		 * @since 3.0.0
		 * @since 4.1.0 The `$depth` parameter was added.
		 *
		 * @param string[] $classes   Array of the CSS classes that are applied to the menu item's `&lt;li&gt;` element.
		 * @param WP_Post  $menu_item The current menu item object.
		 * @param stdClass $args      An object of wp_nav_menu() arguments.
		 * @param int      $depth     Depth of menu item. Used for padding.
		 */
		$class_names = implode( ' ', apply_filters( 'nav_menu_css_class', array_filter( $classes ), $menu_item, $args, $depth ) );
		$class_names = $class_names ? ' class=&quot;' . esc_attr( $class_names ) . '&quot;' : '';

		/**
		 * Filters the ID attribute applied to a menu item's list item element.
		 *
		 * @since 3.0.1
		 * @since 4.1.0 The `$depth` parameter was added.
		 *
		 * @param string   $menu_item_id The ID attribute applied to the menu item's `&lt;li&gt;` element.
		 * @param WP_Post  $menu_item    The current menu item.
		 * @param stdClass $args         An object of wp_nav_menu() arguments.
		 * @param int      $depth        Depth of menu item. Used for padding.
		 */
		$id = apply_filters( 'nav_menu_item_id', 'menu-item-' . $menu_item-&gt;ID, $menu_item, $args, $depth );
		$id = $id ? ' id=&quot;' . esc_attr( $id ) . '&quot;' : '';

		$output .= $indent . '&lt;li' . $id . $class_names . '&gt;';

		$atts           = array();
		$atts['title']  = ! empty( $menu_item-&gt;attr_title ) ? $menu_item-&gt;attr_title : '';
		$atts['target'] = ! empty( $menu_item-&gt;target ) ? $menu_item-&gt;target : '';
		if ( '_blank' === $menu_item-&gt;target &amp;&amp; empty( $menu_item-&gt;xfn ) ) {
			$atts['rel'] = 'noopener';
		} else {
			$atts['rel'] = $menu_item-&gt;xfn;
		}

		if ( ! empty( $menu_item-&gt;url ) ) {
			if ( get_privacy_policy_url() === $menu_item-&gt;url ) {
				$atts['rel'] = empty( $atts['rel'] ) ? 'privacy-policy' : $atts['rel'] . ' privacy-policy';
			}

			$atts['href'] = $menu_item-&gt;url;
		} else {
			$atts['href'] = '';
		}

		$atts['aria-current'] = $menu_item-&gt;current ? 'page' : '';

		/**
		 * Filters the HTML attributes applied to a menu item's anchor element.
		 *
		 * @since 3.6.0
		 * @since 4.1.0 The `$depth` parameter was added.
		 *
		 * @param array $atts {
		 *     The HTML attributes applied to the menu item's `&lt;a&gt;` element, empty strings are ignored.
		 *
		 *     @type string $title        Title attribute.
		 *     @type string $target       Target attribute.
		 *     @type string $rel          The rel attribute.
		 *     @type string $href         The href attribute.
		 *     @type string $aria-current The aria-current attribute.
		 * }
		 * @param WP_Post  $menu_item The current menu item object.
		 * @param stdClass $args      An object of wp_nav_menu() arguments.
		 * @param int      $depth     Depth of menu item. Used for padding.
		 */
		$atts = apply_filters( 'nav_menu_link_attributes', $atts, $menu_item, $args, $depth );

		$attributes = '';
		foreach ( $atts as $attr =&gt; $value ) {
			if ( is_scalar( $value ) &amp;&amp; '' !== $value &amp;&amp; false !== $value ) {
				$value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );
				$attributes .= ' ' . $attr . '=&quot;' . $value . '&quot;';
			}
		}

		/** This filter is documented in wp-includes/post-template.php */
		$title = apply_filters( 'the_title', $menu_item-&gt;title, $menu_item-&gt;ID );

		/**
		 * Filters a menu item's title.
		 *
		 * @since 4.4.0
		 *
		 * @param string   $title     The menu item's title.
		 * @param WP_Post  $menu_item The current menu item object.
		 * @param stdClass $args      An object of wp_nav_menu() arguments.
		 * @param int      $depth     Depth of menu item. Used for padding.
		 */
		$title = apply_filters( 'nav_menu_item_title', $title, $menu_item, $args, $depth );

		$item_output  = $args-&gt;before;
		$item_output .= '&lt;a' . $attributes . '&gt;';
		$item_output .= $args-&gt;link_before . $title . $args-&gt;link_after;
		$item_output .= '&lt;/a&gt;';
		$item_output .= $args-&gt;after;

		/**
		 * Filters a menu item's starting output.
		 *
		 * The menu item's starting output only includes `$args-&gt;before`, the opening `&lt;a&gt;`,
		 * the menu item's title, the closing `&lt;/a&gt;`, and `$args-&gt;after`. Currently, there is
		 * no filter for modifying the opening and closing `&lt;li&gt;` for a menu item.
		 *
		 * @since 3.0.0
		 *
		 * @param string   $item_output The menu item's starting HTML output.
		 * @param WP_Post  $menu_item   Menu item data object.
		 * @param int      $depth       Depth of menu item. Used for padding.
		 * @param stdClass $args        An object of wp_nav_menu() arguments.
		 */
		$output .= apply_filters( 'walker_nav_menu_start_el', $item_output, $menu_item, $depth, $args );
	}

	/**
	 * Ends the element output, if needed.
	 *
	 * @since 3.0.0
	 * @since 5.9.0 Renamed `$item` to `$data_object` to match parent class for PHP 8 named parameter support.
	 *
	 * @see Walker::end_el()
	 *
	 * @param string   $output      Used to append additional content (passed by reference).
	 * @param WP_Post  $data_object Menu item data object. Not used.
	 * @param int      $depth       Depth of page. Not Used.
	 * @param stdClass $args        An object of wp_nav_menu() arguments.
	 */
	public function end_el( &amp;$output, $data_object, $depth = 0, $args = null ) {
		if ( isset( $args-&gt;item_spacing ) &amp;&amp; 'discard' === $args-&gt;item_spacing ) {
			$t = '';
			$n = '';
		} else {
			$t = &quot;\t&quot;;
			$n = &quot;\n&quot;;
		}
		$output .= &quot;&lt;/li&gt;{$n}&quot;;
	}

}
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