261 lines
6.8 KiB
PHP
261 lines
6.8 KiB
PHP
<?php
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/**
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* WP_Navigation_Fallback class
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*
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* Manages fallback behavior for Navigation menus.
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*
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* @package WordPress
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* @subpackage Navigation
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* @since 6.3.0
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*/
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/**
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* Manages fallback behavior for Navigation menus.
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*
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* @access public
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* @since 6.3.0
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*/
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class WP_Navigation_Fallback {
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/**
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* Gets (and/or creates) an appropriate fallback Navigation Menu.
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*
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* @since 6.3.0
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*
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* @return WP_Post|null the fallback Navigation Post or null.
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*/
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public static function get_fallback() {
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/**
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* Filters whether or not a fallback should be created.
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*
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* @since 6.3.0
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*
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* @param bool $create Whether to create a fallback navigation menu. Default true.
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*/
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$should_create_fallback = apply_filters( 'wp_navigation_should_create_fallback', true );
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$fallback = static::get_most_recently_published_navigation();
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if ( $fallback || ! $should_create_fallback ) {
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return $fallback;
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}
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$fallback = static::create_classic_menu_fallback();
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if ( $fallback && ! is_wp_error( $fallback ) ) {
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// Return the newly created fallback post object which will now be the most recently created navigation menu.
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return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
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}
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$fallback = static::create_default_fallback();
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if ( $fallback && ! is_wp_error( $fallback ) ) {
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// Return the newly created fallback post object which will now be the most recently created navigation menu.
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return $fallback instanceof WP_Post ? $fallback : static::get_most_recently_published_navigation();
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}
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return null;
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}
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/**
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* Finds the most recently published `wp_navigation` post type.
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*
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* @since 6.3.0
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*
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* @return WP_Post|null the first non-empty Navigation or null.
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*/
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private static function get_most_recently_published_navigation() {
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$parsed_args = array(
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'post_type' => 'wp_navigation',
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'no_found_rows' => true,
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'update_post_meta_cache' => false,
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'update_post_term_cache' => false,
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'order' => 'DESC',
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'orderby' => 'date',
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'post_status' => 'publish',
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'posts_per_page' => 1,
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);
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$navigation_post = new WP_Query( $parsed_args );
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if ( count( $navigation_post->posts ) > 0 ) {
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return $navigation_post->posts[0];
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}
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return null;
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}
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/**
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* Creates a Navigation Menu post from a Classic Menu.
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*
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* @since 6.3.0
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*
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* @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
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*/
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private static function create_classic_menu_fallback() {
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// See if we have a classic menu.
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$classic_nav_menu = static::get_fallback_classic_menu();
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if ( ! $classic_nav_menu ) {
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return new WP_Error( 'no_classic_menus', __( 'No Classic Menus found.' ) );
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}
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// If there is a classic menu then convert it to blocks.
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$classic_nav_menu_blocks = WP_Classic_To_Block_Menu_Converter::convert( $classic_nav_menu );
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if ( is_wp_error( $classic_nav_menu_blocks ) ) {
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return $classic_nav_menu_blocks;
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}
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if ( empty( $classic_nav_menu_blocks ) ) {
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return new WP_Error( 'cannot_convert_classic_menu', __( 'Unable to convert Classic Menu to blocks.' ) );
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}
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// Create a new navigation menu from the classic menu.
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$classic_menu_fallback = wp_insert_post(
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array(
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'post_content' => $classic_nav_menu_blocks,
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'post_title' => $classic_nav_menu->name,
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'post_name' => $classic_nav_menu->slug,
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'post_status' => 'publish',
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'post_type' => 'wp_navigation',
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),
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true // So that we can check whether the result is an error.
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);
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return $classic_menu_fallback;
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}
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/**
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* Determines the most appropriate classic navigation menu to use as a fallback.
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*
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* @since 6.3.0
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*
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* @return WP_Term|null The most appropriate classic navigation menu to use as a fallback.
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*/
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private static function get_fallback_classic_menu() {
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$classic_nav_menus = wp_get_nav_menus();
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if ( ! $classic_nav_menus || is_wp_error( $classic_nav_menus ) ) {
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return null;
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}
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$nav_menu = static::get_nav_menu_at_primary_location();
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if ( $nav_menu ) {
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return $nav_menu;
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}
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$nav_menu = static::get_nav_menu_with_primary_slug( $classic_nav_menus );
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if ( $nav_menu ) {
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return $nav_menu;
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}
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return static::get_most_recently_created_nav_menu( $classic_nav_menus );
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}
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/**
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* Sorts the classic menus and returns the most recently created one.
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*
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* @since 6.3.0
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*
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* @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
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* @return WP_Term The most recently created classic nav menu.
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*/
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private static function get_most_recently_created_nav_menu( $classic_nav_menus ) {
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usort(
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$classic_nav_menus,
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static function( $a, $b ) {
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return $b->term_id - $a->term_id;
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}
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);
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return $classic_nav_menus[0];
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}
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/**
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* Returns the classic menu with the slug `primary` if it exists.
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*
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* @since 6.3.0
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*
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* @param WP_Term[] $classic_nav_menus Array of classic nav menu term objects.
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* @return WP_Term|null The classic nav menu with the slug `primary` or null.
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*/
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private static function get_nav_menu_with_primary_slug( $classic_nav_menus ) {
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foreach ( $classic_nav_menus as $classic_nav_menu ) {
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if ( 'primary' === $classic_nav_menu->slug ) {
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return $classic_nav_menu;
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}
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}
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return null;
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}
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/**
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* Gets the classic menu assigned to the `primary` navigation menu location
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* if it exists.
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*
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* @since 6.3.0
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*
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* @return WP_Term|null The classic nav menu assigned to the `primary` location or null.
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*/
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private static function get_nav_menu_at_primary_location() {
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$locations = get_nav_menu_locations();
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if ( isset( $locations['primary'] ) ) {
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$primary_menu = wp_get_nav_menu_object( $locations['primary'] );
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if ( $primary_menu ) {
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return $primary_menu;
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}
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}
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return null;
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}
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/**
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* Creates a default Navigation Block Menu fallback.
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*
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* @since 6.3.0
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*
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* @return int|WP_Error The post ID of the default fallback menu or a WP_Error object.
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*/
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private static function create_default_fallback() {
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$default_blocks = static::get_default_fallback_blocks();
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// Create a new navigation menu from the fallback blocks.
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$default_fallback = wp_insert_post(
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array(
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'post_content' => $default_blocks,
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'post_title' => _x( 'Navigation', 'Title of a Navigation menu' ),
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'post_name' => 'navigation',
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'post_status' => 'publish',
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'post_type' => 'wp_navigation',
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),
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true // So that we can check whether the result is an error.
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);
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return $default_fallback;
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}
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/**
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* Gets the rendered markup for the default fallback blocks.
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*
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* @since 6.3.0
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*
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* @return string default blocks markup to use a the fallback.
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*/
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private static function get_default_fallback_blocks() {
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$registry = WP_Block_Type_Registry::get_instance();
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// If `core/page-list` is not registered then use empty blocks.
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return $registry->is_registered( 'core/page-list' ) ? '<!-- wp:page-list /-->' : '';
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}
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}
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