<?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.

 *                                                    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 ) {

		$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.