<?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.

 *

 * @staticvar array $menu_id_slugs

 *

 * @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 callable|bool      $fallback_cb     If the menu doesn't exists, 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.

 *     @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. Default is a ul with an id and class.

 *                                               Uses printf() format with numbered placeholders.

 *     @type string             $item_spacing    Whether to preserve whitespace within the menu's HTML. Accepts 'preserve' or 'discard'. Default 'preserve'.

 * }

 * @return string|false|void 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();

	$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 to 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

		$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

		$menus = wp_get_nav_menus();

		foreach ( $menus as $menu_maybe ) {

			if ( $menu_items = wp_get_nav_menu_items( $menu_maybe->term_id, array( 'update_post_term_cache' => false ) ) ) {

				$menu = $menu_maybe;

				break;

			}

		}

	}

	if ( empty( $args->menu ) ) {

		$args->menu = $menu;

	}

	// If the menu exists, get its 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.

	 */

			return call_user_func( $args->fallback_cb, (array) $args );

		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 array $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 ) ) {

			$show_container = true;

		}

	}

	// Set up the $menu_item variables

	_wp_menu_item_classes_by_context( $menu_items );

	$sorted_menu_items = $menu_items_with_children = array();

	foreach ( (array) $menu_items as $menu_item ) {

		$sorted_menu_items[ $menu_item->menu_order ] = $menu_item;

			$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 ) {

				$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 );

	// 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 ) ) {

				$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.

		return false;

	$nav_menu .= sprintf( $args->items_wrap, esc_attr( $wrap_id ), esc_attr( $wrap_class ), $items );

	unset( $items );

		$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 );

		echo $nav_menu;

		return $nav_menu;

}

/**

 * Add the class property classes for the current context, if applicable.

 *

 * @access private

 * @since 3.0.0

 *

 * @global WP_Query   $wp_query

 * @global WP_Rewrite $wp_rewrite

 *

 * @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_id = (int) $wp_query->queried_object_id;

	$possible_taxonomy_ancestors = array();

	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 );

				if ( is_array( $terms ) ) {

					$possible_object_parents = array_merge( $possible_object_parents, $terms );

					foreach ( (array) $term_hierarchy as $anc => $descs ) {

							$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_to_ancestor = array();

		foreach ( (array) $term_hierarchy as $anc => $descs ) {

				$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 );

	foreach ( (array) $menu_items as $key => $menu_item ) {

		$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';

		}

		// 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( $menu_item->object_id, $possible_object_parents ) ) {

			$active_parent_object_ids[] = (int) $menu_item->object_id;

		} 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 )

			)

		) {