Adding upstream version 6.4.3+dfsg1.upstream/6.4.3+dfsg1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 696 insertions, 0 deletions

diff --git a/wp-includes/nav-menu-template.php b/wp-includes/nav-menu-template.php
new file mode 100644
index 0000000..46a4d95
--- /dev/null
+++ b/wp-includes/nav-menu-template.php
@@ -0,0 +1,696 @@
+<?php
+/**
+ * Nav Menu API: Template functions
+ *
+ * @package WordPress
+ * @subpackage Nav_Menus
+ * @since 3.0.0
+ */
+
+/** Walker_Nav_Menu class */
+require_once ABSPATH . WPINC . '/class-walker-nav-menu.php';
+
+/**
+ * Displays a navigation menu.
+ *
+ * @since 3.0.0
+ * @since 4.7.0 Added the `item_spacing` argument.
+ * @since 5.5.0 Added the `container_aria_label` argument.
+ *
+ * @param array $args {
+ *     Optional. Array of nav menu arguments.
+ *
+ *     @type int|string|WP_Term $menu                 Desired menu. Accepts a menu ID, slug, name, or object.
+ *                                                    Default empty.
+ *     @type string             $menu_class           CSS class to use for the ul element which forms the menu.
+ *                                                    Default 'menu'.
+ *     @type string             $menu_id              The ID that is applied to the ul element which forms the menu.
+ *                                                    Default is the menu slug, incremented.
+ *     @type string             $container            Whether to wrap the ul, and what to wrap it with.
+ *                                                    Default 'div'.
+ *     @type string             $container_class      Class that is applied to the container.
+ *                                                    Default 'menu-{menu slug}-container'.
+ *     @type string             $container_id         The ID that is applied to the container. Default empty.
+ *     @type string             $container_aria_label The aria-label attribute that is applied to the container
+ *                                                    when it's a nav element. Default empty.
+ *     @type callable|false     $fallback_cb          If the menu doesn't exist, a callback function will fire.
+ *                                                    Default is 'wp_page_menu'. Set to false for no fallback.
+ *     @type string             $before               Text before the link markup. Default empty.
+ *     @type string             $after                Text after the link markup. Default empty.
+ *     @type string             $link_before          Text before the link text. Default empty.
+ *     @type string             $link_after           Text after the link text. Default empty.
+ *     @type bool               $echo                 Whether to echo the menu or return it. Default true.
+ *     @type int                $depth                How many levels of the hierarchy are to be included.
+ *                                                    0 means all. Default 0.
+ *                                                    Default 0.
+ *     @type object             $walker               Instance of a custom walker class. Default empty.
+ *     @type string             $theme_location       Theme location to be used. Must be registered with
+ *                                                    register_nav_menu() in order to be selectable by the user.
+ *     @type string             $items_wrap           How the list items should be wrapped. Uses printf() format with
+ *                                                    numbered placeholders. Default is a ul with an id and class.
+ *     @type string             $item_spacing         Whether to preserve whitespace within the menu's HTML.
+ *                                                    Accepts 'preserve' or 'discard'. Default 'preserve'.
+ * }
+ * @return void|string|false Void if 'echo' argument is true, menu output if 'echo' is false.
+ *                           False if there are no items or no menu was found.
+ */
+function wp_nav_menu( $args = array() ) {
+	static $menu_id_slugs = array();
+
+	$defaults = array(
+		'menu'                 => '',
+		'container'            => 'div',
+		'container_class'      => '',
+		'container_id'         => '',
+		'container_aria_label' => '',
+		'menu_class'           => 'menu',
+		'menu_id'              => '',
+		'echo'                 => true,
+		'fallback_cb'          => 'wp_page_menu',
+		'before'               => '',
+		'after'                => '',
+		'link_before'          => '',
+		'link_after'           => '',
+		'items_wrap'           => '<ul id="%1$s" class="%2$s">%3$s</ul>',
+		'item_spacing'         => 'preserve',
+		'depth'                => 0,
+		'walker'               => '',
+		'theme_location'       => '',
+	);
+
+	$args = wp_parse_args( $args, $defaults );
+
+	if ( ! in_array( $args['item_spacing'], array( 'preserve', 'discard' ), true ) ) {
+		// Invalid value, fall back to default.
+		$args['item_spacing'] = $defaults['item_spacing'];
+	}
+
+	/**
+	 * Filters the arguments used to display a navigation menu.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see wp_nav_menu()
+	 *
+	 * @param array $args Array of wp_nav_menu() arguments.
+	 */
+	$args = apply_filters( 'wp_nav_menu_args', $args );
+	$args = (object) $args;
+
+	/**
+	 * Filters whether to short-circuit the wp_nav_menu() output.
+	 *
+	 * Returning a non-null value from the filter will short-circuit wp_nav_menu(),
+	 * echoing that value if $args->echo is true, returning that value otherwise.
+	 *
+	 * @since 3.9.0
+	 *
+	 * @see wp_nav_menu()
+	 *
+	 * @param string|null $output Nav menu output to short-circuit with. Default null.
+	 * @param stdClass    $args   An object containing wp_nav_menu() arguments.
+	 */
+	$nav_menu = apply_filters( 'pre_wp_nav_menu', null, $args );
+
+	if ( null !== $nav_menu ) {
+		if ( $args->echo ) {
+			echo $nav_menu;
+			return;
+		}
+
+		return $nav_menu;
+	}
+
+	// Get the nav menu based on the requested menu.
+	$menu = wp_get_nav_menu_object( $args->menu );
+
+	// Get the nav menu based on the theme_location.
+	$locations = get_nav_menu_locations();
+	if ( ! $menu && $args->theme_location && $locations && isset( $locations[ $args->theme_location ] ) ) {
+		$menu = wp_get_nav_menu_object( $locations[ $args->theme_location ] );
+	}
+
+	// Get the first menu that has items if we still can't find a menu.
+	if ( ! $menu && ! $args->theme_location ) {
+		$menus = wp_get_nav_menus();
+		foreach ( $menus as $menu_maybe ) {
+			$menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) );
+			if ( $menu_items ) {
+				$menu = $menu_maybe;
+				break;
+			}
+		}
+	}
+
+	if ( empty( $args->menu ) ) {
+		$args->menu = $menu;
+	}
+
+	// If the menu exists, get its items.
+	if ( $menu && ! is_wp_error( $menu ) && ! isset( $menu_items ) ) {
+		$menu_items = wp_get_nav_menu_items( $menu->term_id, array( 'update_post_term_cache' => false ) );
+	}
+
+	/*
+	 * If no menu was found:
+	 *  - Fall back (if one was specified), or bail.
+	 *
+	 * If no menu items were found:
+	 *  - Fall back, but only if no theme location was specified.
+	 *  - Otherwise, bail.
+	 */
+	if ( ( ! $menu || is_wp_error( $menu ) || ( isset( $menu_items ) && empty( $menu_items ) && ! $args->theme_location ) )
+		&& isset( $args->fallback_cb ) && $args->fallback_cb && is_callable( $args->fallback_cb ) ) {
+			return call_user_func( $args->fallback_cb, (array) $args );
+	}
+
+	if ( ! $menu || is_wp_error( $menu ) ) {
+		return false;
+	}
+
+	$nav_menu = '';
+	$items    = '';
+
+	$show_container = false;
+	if ( $args->container ) {
+		/**
+		 * Filters the list of HTML tags that are valid for use as menu containers.
+		 *
+		 * @since 3.0.0
+		 *
+		 * @param string[] $tags The acceptable HTML tags for use as menu containers.
+		 *                       Default is array containing 'div' and 'nav'.
+		 */
+		$allowed_tags = apply_filters( 'wp_nav_menu_container_allowedtags', array( 'div', 'nav' ) );
+
+		if ( is_string( $args->container ) && in_array( $args->container, $allowed_tags, true ) ) {
+			$show_container = true;
+			$class          = $args->container_class ? ' class="' . esc_attr( $args->container_class ) . '"' : ' class="menu-' . $menu->slug . '-container"';
+			$id             = $args->container_id ? ' id="' . esc_attr( $args->container_id ) . '"' : '';
+			$aria_label     = ( 'nav' === $args->container && $args->container_aria_label ) ? ' aria-label="' . esc_attr( $args->container_aria_label ) . '"' : '';
+			$nav_menu      .= '<' . $args->container . $id . $class . $aria_label . '>';
+		}
+	}
+
+	// Set up the $menu_item variables.
+	_wp_menu_item_classes_by_context( $menu_items );
+
+	$sorted_menu_items        = array();
+	$menu_items_with_children = array();
+	foreach ( (array) $menu_items as $menu_item ) {
+		/*
+		 * Fix invalid `menu_item_parent`. See: https://core.trac.wordpress.org/ticket/56926.
+		 * Compare as strings. Plugins may change the ID to a string.
+		 */
+		if ( (string) $menu_item->ID === (string) $menu_item->menu_item_parent ) {
+			$menu_item->menu_item_parent = 0;
+		}
+
+		$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;
+		if ( $menu_item->menu_item_parent ) {
+			$menu_items_with_children[ $menu_item->menu_item_parent ] = true;
+		}
+	}
+
+	// Add the menu-item-has-children class where applicable.
+	if ( $menu_items_with_children ) {
+		foreach ( $sorted_menu_items as &$menu_item ) {
+			if ( isset( $menu_items_with_children[ $menu_item->ID ] ) ) {
+				$menu_item->classes[] = 'menu-item-has-children';
+			}
+		}
+	}
+
+	unset( $menu_items, $menu_item );
+
+	/**
+	 * Filters the sorted list of menu item objects before generating the menu's HTML.
+	 *
+	 * @since 3.1.0
+	 *
+	 * @param array    $sorted_menu_items The menu items, sorted by each menu item's menu order.
+	 * @param stdClass $args              An object containing wp_nav_menu() arguments.
+	 */
+	$sorted_menu_items = apply_filters( 'wp_nav_menu_objects', $sorted_menu_items, $args );
+
+	$items .= walk_nav_menu_tree( $sorted_menu_items, $args->depth, $args );
+	unset( $sorted_menu_items );
+
+	// Attributes.
+	if ( ! empty( $args->menu_id ) ) {
+		$wrap_id = $args->menu_id;
+	} else {
+		$wrap_id = 'menu-' . $menu->slug;
+
+		while ( in_array( $wrap_id, $menu_id_slugs, true ) ) {
+			if ( preg_match( '#-(\d+)$#', $wrap_id, $matches ) ) {
+				$wrap_id = preg_replace( '#-(\d+)$#', '-' . ++$matches[1], $wrap_id );
+			} else {
+				$wrap_id = $wrap_id . '-1';
+			}
+		}
+	}
+	$menu_id_slugs[] = $wrap_id;
+
+	$wrap_class = $args->menu_class ? $args->menu_class : '';
+
+	/**
+	 * Filters the HTML list content for navigation menus.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see wp_nav_menu()
+	 *
+	 * @param string   $items The HTML list content for the menu items.
+	 * @param stdClass $args  An object containing wp_nav_menu() arguments.
+	 */
+	$items = apply_filters( 'wp_nav_menu_items', $items, $args );
+	/**
+	 * Filters the HTML list content for a specific navigation menu.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see wp_nav_menu()
+	 *
+	 * @param string   $items The HTML list content for the menu items.
+	 * @param stdClass $args  An object containing wp_nav_menu() arguments.
+	 */
+	$items = apply_filters( "wp_nav_menu_{$menu->slug}_items", $items, $args );
+
+	// Don't print any markup if there are no items at this point.
+	if ( empty( $items ) ) {
+		return false;
+	}
+
+	$nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items );
+	unset( $items );
+
+	if ( $show_container ) {
+		$nav_menu .= '</' . $args->container . '>';
+	}
+
+	/**
+	 * Filters the HTML content for navigation menus.
+	 *
+	 * @since 3.0.0
+	 *
+	 * @see wp_nav_menu()
+	 *
+	 * @param string   $nav_menu The HTML content for the navigation menu.
+	 * @param stdClass $args     An object containing wp_nav_menu() arguments.
+	 */
+	$nav_menu = apply_filters( 'wp_nav_menu', $nav_menu, $args );
+
+	if ( $args->echo ) {
+		echo $nav_menu;
+	} else {
+		return $nav_menu;
+	}
+}
+
+/**
+ * Adds the class property classes for the current context, if applicable.
+ *
+ * @access private
+ * @since 3.0.0
+ *
+ * @global WP_Query   $wp_query   WordPress Query object.
+ * @global WP_Rewrite $wp_rewrite WordPress rewrite component.
+ *
+ * @param array $menu_items The current menu item objects to which to add the class property information.
+ */
+function _wp_menu_item_classes_by_context( &$menu_items ) {
+	global $wp_query, $wp_rewrite;
+
+	$queried_object    = $wp_query->get_queried_object();
+	$queried_object_id = (int) $wp_query->queried_object_id;
+
+	$active_object               = '';
+	$active_ancestor_item_ids    = array();
+	$active_parent_item_ids      = array();
+	$active_parent_object_ids    = array();
+	$possible_taxonomy_ancestors = array();
+	$possible_object_parents     = array();
+	$home_page_id                = (int) get_option( 'page_for_posts' );
+
+	if ( $wp_query->is_singular && ! empty( $queried_object->post_type ) && ! is_post_type_hierarchical( $queried_object->post_type ) ) {
+		foreach ( (array) get_object_taxonomies( $queried_object->post_type ) as $taxonomy ) {
+			if ( is_taxonomy_hierarchical( $taxonomy ) ) {
+				$term_hierarchy = _get_term_hierarchy( $taxonomy );
+				$terms          = wp_get_object_terms( $queried_object_id, $taxonomy, array( 'fields' => 'ids' ) );
+				if ( is_array( $terms ) ) {
+					$possible_object_parents = array_merge( $possible_object_parents, $terms );
+					$term_to_ancestor        = array();
+					foreach ( (array) $term_hierarchy as $anc => $descs ) {
+						foreach ( (array) $descs as $desc ) {
+							$term_to_ancestor[ $desc ] = $anc;
+						}
+					}
+
+					foreach ( $terms as $desc ) {
+						do {
+							$possible_taxonomy_ancestors[ $taxonomy ][] = $desc;
+							if ( isset( $term_to_ancestor[ $desc ] ) ) {
+								$_desc = $term_to_ancestor[ $desc ];
+								unset( $term_to_ancestor[ $desc ] );
+								$desc = $_desc;
+							} else {
+								$desc = 0;
+							}
+						} while ( ! empty( $desc ) );
+					}
+				}
+			}
+		}
+	} elseif ( ! empty( $queried_object->taxonomy ) && is_taxonomy_hierarchical( $queried_object->taxonomy ) ) {
+		$term_hierarchy   = _get_term_hierarchy( $queried_object->taxonomy );
+		$term_to_ancestor = array();
+		foreach ( (array) $term_hierarchy as $anc => $descs ) {
+			foreach ( (array) $descs as $desc ) {
+				$term_to_ancestor[ $desc ] = $anc;
+			}
+		}
+		$desc = $queried_object->term_id;
+		do {
+			$possible_taxonomy_ancestors[ $queried_object->taxonomy ][] = $desc;
+			if ( isset( $term_to_ancestor[ $desc ] ) ) {
+				$_desc = $term_to_ancestor[ $desc ];
+				unset( $term_to_ancestor[ $desc ] );
+				$desc = $_desc;
+			} else {
+				$desc = 0;
+			}
+		} while ( ! empty( $desc ) );
+	}
+
+	$possible_object_parents = array_filter( $possible_object_parents );
+
+	$front_page_url         = home_url();
+	$front_page_id          = (int) get_option( 'page_on_front' );
+	$privacy_policy_page_id = (int) get_option( 'wp_page_for_privacy_policy' );
+
+	foreach ( (array) $menu_items as $key => $menu_item ) {
+
+		$menu_items[ $key ]->current = false;
+
+		$classes   = (array) $menu_item->classes;
+		$classes[] = 'menu-item';
+		$classes[] = 'menu-item-type-' . $menu_item->type;
+		$classes[] = 'menu-item-object-' . $menu_item->object;
+
+		// This menu item is set as the 'Front Page'.
+		if ( 'post_type' === $menu_item->type && $front_page_id === (int) $menu_item->object_id ) {
+			$classes[] = 'menu-item-home';
+		}
+
+		// This menu item is set as the 'Privacy Policy Page'.
+		if ( 'post_type' === $menu_item->type && $privacy_policy_page_id === (int) $menu_item->object_id ) {
+			$classes[] = 'menu-item-privacy-policy';
+		}
+
+		// If the menu item corresponds to a taxonomy term for the currently queried non-hierarchical post object.
+		if ( $wp_query->is_singular && 'taxonomy' === $menu_item->type
+			&& in_array( (int) $menu_item->object_id, $possible_object_parents, true )
+		) {
+			$active_parent_object_ids[] = (int) $menu_item->object_id;
+			$active_parent_item_ids[]   = (int) $menu_item->db_id;
+			$active_object              = $queried_object->post_type;
+
+			// If the menu item corresponds to the currently queried post or taxonomy object.
+		} elseif (
+			$menu_item->object_id == $queried_object_id
+			&& (
+				( ! empty( $home_page_id ) && 'post_type' === $menu_item->type
+					&& $wp_query->is_home && $home_page_id == $menu_item->object_id )
+				|| ( 'post_type' === $menu_item->type && $wp_query->is_singular )
+				|| ( 'taxonomy' === $menu_item->type
+					&& ( $wp_query->is_category || $wp_query->is_tag || $wp_query->is_tax )
+					&& $queried_object->taxonomy == $menu_item->object )
+			)
+		) {
+			$classes[]                   = 'current-menu-item';
+			$menu_items[ $key ]->current = true;
+			$_anc_id                     = (int) $menu_item->db_id;
+
+			while (
+				( $_anc_id = (int) get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) )
+				&& ! in_array( $_anc_id, $active_ancestor_item_ids, true )
+			) {
+				$active_ancestor_item_ids[] = $_anc_id;
+			}
+
+			if ( 'post_type' === $menu_item->type && 'page' === $menu_item->object ) {
+				// Back compat classes for pages to match wp_page_menu().
+				$classes[] = 'page_item';
+				$classes[] = 'page-item-' . $menu_item->object_id;
+				$classes[] = 'current_page_item';
+			}
+
+			$active_parent_item_ids[]   = (int) $menu_item->menu_item_parent;
+			$active_parent_object_ids[] = (int) $menu_item->post_parent;
+			$active_object              = $menu_item->object;
+
+			// If the menu item corresponds to the currently queried post type archive.
+		} elseif (
+			'post_type_archive' === $menu_item->type
+			&& is_post_type_archive( array( $menu_item->object ) )
+		) {
+			$classes[]                   = 'current-menu-item';
+			$menu_items[ $key ]->current = true;
+			$_anc_id                     = (int) $menu_item->db_id;
+
+			while (
+				( $_anc_id = (int) get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) )
+				&& ! in_array( $_anc_id, $active_ancestor_item_ids, true )
+			) {
+				$active_ancestor_item_ids[] = $_anc_id;
+			}
+
+			$active_parent_item_ids[] = (int) $menu_item->menu_item_parent;
+
+			// If the menu item corresponds to the currently requested URL.
+		} elseif ( 'custom' === $menu_item->object && isset( $_SERVER['HTTP_HOST'] ) ) {
+			$_root_relative_current = untrailingslashit( $_SERVER['REQUEST_URI'] );
+
+			// If it's the customize page then it will strip the query var off the URL before entering the comparison block.
+			if ( is_customize_preview() ) {
+				$_root_relative_current = strtok( untrailingslashit( $_SERVER['REQUEST_URI'] ), '?' );
+			}
+
+			$current_url        = set_url_scheme( 'http://' . $_SERVER['HTTP_HOST'] . $_root_relative_current );
+			$raw_item_url       = strpos( $menu_item->url, '#' ) ? substr( $menu_item->url, 0, strpos( $menu_item->url, '#' ) ) : $menu_item->url;
+			$item_url           = set_url_scheme( untrailingslashit( $raw_item_url ) );
+			$_indexless_current = untrailingslashit( preg_replace( '/' . preg_quote( $wp_rewrite->index, '/' ) . '$/', '', $current_url ) );
+
+			$matches = array(
+				$current_url,
+				urldecode( $current_url ),
+				$_indexless_current,
+				urldecode( $_indexless_current ),
+				$_root_relative_current,
+				urldecode( $_root_relative_current ),
+			);
+
+			if ( $raw_item_url && in_array( $item_url, $matches, true ) ) {
+				$classes[]                   = 'current-menu-item';
+				$menu_items[ $key ]->current = true;
+				$_anc_id                     = (int) $menu_item->db_id;
+
+				while (
+					( $_anc_id = (int) get_post_meta( $_anc_id, '_menu_item_menu_item_parent', true ) )
+					&& ! in_array( $_anc_id, $active_ancestor_item_ids, true )
+				) {
+					$active_ancestor_item_ids[] = $_anc_id;
+				}
+
+				if ( in_array( home_url(), array( untrailingslashit( $current_url ), untrailingslashit( $_indexless_current ) ), true ) ) {
+					// Back compat for home link to match wp_page_menu().
+					$classes[] = 'current_page_item';
+				}
+				$active_parent_item_ids[]   = (int) $menu_item->menu_item_parent;
+				$active_parent_object_ids[] = (int) $menu_item->post_parent;
+				$active_object              = $menu_item->object;
+
+				// Give front page item the 'current-menu-item' class when extra query arguments are involved.
+			} elseif ( $item_url == $front_page_url && is_front_page() ) {
+				$classes[] = 'current-menu-item';
+			}
+
+			if ( untrailingslashit( $item_url ) == home_url() ) {
+				$classes[] = 'menu-item-home';
+			}
+		}
+
+		// Back-compat with wp_page_menu(): add "current_page_parent" to static home page link for any non-page query.
+		if ( ! empty( $home_page_id ) && 'post_type' === $menu_item->type
+			&& empty( $wp_query->is_page ) && $home_page_id == $menu_item->object_id
+		) {
+			$classes[] = 'current_page_parent';
+		}
+
+		$menu_items[ $key ]->classes = array_unique( $classes );
+	}
+	$active_ancestor_item_ids = array_filter( array_unique( $active_ancestor_item_ids ) );
+	$active_parent_item_ids   = array_filter( array_unique( $active_parent_item_ids ) );
+	$active_parent_object_ids = array_filter( array_unique( $active_parent_object_ids ) );
+
+	// Set parent's class.
+	foreach ( (array) $menu_items as $key => $parent_item ) {
+		$classes                                   = (array) $parent_item->classes;
+		$menu_items[ $key ]->current_item_ancestor = false;
+		$menu_items[ $key ]->current_item_parent   = false;
+
+		if (
+			isset( $parent_item->type )
+			&& (
+				// Ancestral post object.
+				(
+					'post_type' === $parent_item->type
+					&& ! empty( $queried_object->post_type )
+					&& is_post_type_hierarchical( $queried_object->post_type )
+					&& in_array( (int) $parent_item->object_id, $queried_object->ancestors, true )
+					&& $parent_item->object != $queried_object->ID
+				) ||
+
+				// Ancestral term.
+				(
+					'taxonomy' === $parent_item->type
+					&& isset( $possible_taxonomy_ancestors[ $parent_item->object ] )
+					&& in_array( (int) $parent_item->object_id, $possible_taxonomy_ancestors[ $parent_item->object ], true )
+					&& (
+						! isset( $queried_object->term_id ) ||
+						$parent_item->object_id != $queried_object->term_id
+					)
+				)
+			)
+		) {
+			if ( ! empty( $queried_object->taxonomy ) ) {
+				$classes[] = 'current-' . $queried_object->taxonomy . '-ancestor';
+			} else {
+				$classes[] = 'current-' . $queried_object->post_type . '-ancestor';
+			}
+		}
+
+		if ( in_array( (int) $parent_item->db_id, $active_ancestor_item_ids, true ) ) {
+			$classes[] = 'current-menu-ancestor';
+
+			$menu_items[ $key ]->current_item_ancestor = true;
+		}
+		if ( in_array( (int) $parent_item->db_id, $active_parent_item_ids, true ) ) {
+			$classes[] = 'current-menu-parent';
+
+			$menu_items[ $key ]->current_item_parent = true;
+		}
+		if ( in_array( (int) $parent_item->object_id, $active_parent_object_ids, true ) ) {
+			$classes[] = 'current-' . $active_object . '-parent';
+		}
+
+		if ( 'post_type' === $parent_item->type && 'page' === $parent_item->object ) {
+			// Back compat classes for pages to match wp_page_menu().
+			if ( in_array( 'current-menu-parent', $classes, true ) ) {
+				$classes[] = 'current_page_parent';
+			}
+			if ( in_array( 'current-menu-ancestor', $classes, true ) ) {
+				$classes[] = 'current_page_ancestor';
+			}
+		}
+
+		$menu_items[ $key ]->classes = array_unique( $classes );
+	}
+}
+
+/**
+ * Retrieves the HTML list content for nav menu items.
+ *
+ * @uses Walker_Nav_Menu to create HTML list content.
+ * @since 3.0.0
+ *
+ * @param array    $items The menu items, sorted by each menu item's menu order.
+ * @param int      $depth Depth of the item in reference to parents.
+ * @param stdClass $args  An object containing wp_nav_menu() arguments.
+ * @return string The HTML list content for the menu items.
+ */
+function walk_nav_menu_tree( $items, $depth, $args ) {
+	$walker = ( empty( $args->walker ) ) ? new Walker_Nav_Menu() : $args->walker;
+
+	return $walker->walk( $items, $depth, $args );
+}
+
+/**
+ * Prevents a menu item ID from being used more than once.
+ *
+ * @since 3.0.1
+ * @access private
+ *
+ * @param string $id
+ * @param object $item
+ * @return string
+ */
+function _nav_menu_item_id_use_once( $id, $item ) {
+	static $_used_ids = array();
+
+	if ( in_array( $item->ID, $_used_ids, true ) ) {
+		return '';
+	}
+
+	$_used_ids[] = $item->ID;
+
+	return $id;
+}
+
+/**
+ * Remove the `menu-item-has-children` class from bottom level menu items.
+ *
+ * This runs on the {@see 'nav_menu_css_class'} filter. The $args and $depth
+ * parameters were added after the filter was originally introduced in
+ * WordPress 3.0.0 so this needs to allow for cases in which the filter is
+ * called without them.
+ *
+ * @see https://core.trac.wordpress.org/ticket/56926.
+ *
+ * @since 6.2.0
+ *
+ * @param string[]       $classes   Array of the CSS classes that are applied to the menu item's `<li>` element.
+ * @param WP_Post        $menu_item The current menu item object.
+ * @param stdClass|false $args      An object of wp_nav_menu() arguments. Default false ($args unspecified when filter is called).
+ * @param int|false      $depth     Depth of menu item. Default false ($depth unspecified when filter is called).
+ * @return string[] Modified nav menu classes.
+ */
+function wp_nav_menu_remove_menu_item_has_children_class( $classes, $menu_item, $args = false, $depth = false ) {
+	/*
+	 * Account for the filter being called without the $args or $depth parameters.
+	 *
+	 * This occurs when a theme uses a custom walker calling the `nav_menu_css_class`
+	 * filter using the legacy formats prior to the introduction of the $args and
+	 * $depth parameters.
+	 *
+	 * As both of these parameters are required for this function to determine
+	 * both the current and maximum depth of the menu tree, the function does not
+	 * attempt to remove the `menu-item-has-children` class if these parameters
+	 * are not set.
+	 */
+	if ( false === $depth || false === $args ) {
+		return $classes;
+	}
+
+	// Max-depth is 1-based.
+	$max_depth = isset( $args->depth ) ? (int) $args->depth : 0;
+	// Depth is 0-based so needs to be increased by one.
+	$depth = $depth + 1;
+
+	// Complete menu tree is displayed.
+	if ( 0 === $max_depth ) {
+		return $classes;
+	}
+
+	/*
+	 * Remove the `menu-item-has-children` class from bottom level menu items.
+	 * -1 is used to display all menu items in one level so the class should
+	 * be removed from all menu items.
+	 */
+	if ( -1 === $max_depth || $depth >= $max_depth ) {
+		$classes = array_diff( $classes, array( 'menu-item-has-children' ) );
+	}
+
+	return $classes;
+}