ate the controller class once per request.
	 *
	 * @since 6.4.0
	 *
	 * @return WP_REST_Controller|null The controller instance, or null if the post type
	 *                                 is set not to show in rest.
	 */
	public function get_revisions_rest_controller() {
		if ( ! $this->show_in_rest ) {
			return null;
		}

		if ( ! post_type_supports( $this->name, 'revisions' ) ) {
			return null;
		}

		$class = $this->revisions_rest_controller_class ? $this->revisions_rest_controller_class : WP_REST_Revisions_Controller::class;
		if ( ! class_exists( $class ) ) {
			return null;
		}

		if ( ! is_subclass_of( $class, WP_REST_Controller::class ) ) {
			return null;
		}

		if ( ! $this->revisions_rest_controller ) {
			$this->revisions_rest_controller = new $class( $this->name );
		}

		if ( ! ( $this->revisions_rest_controller instanceof $class ) ) {
			return null;
		}

		return $this->revisions_rest_controller;
	}

	/**
	 * Gets the REST API autosave controller for this post type.
	 *
	 * Will only instantiate the controller class once per request.
	 *
	 * @since 6.4.0
	 *
	 * @return WP_REST_Controller|null The controller instance, or null if the post type
	 *                                 is set not to show in rest.
	 */
	public function get_autosave_rest_controller() {
		if ( ! $this->show_in_rest ) {
			return null;
		}

		if ( ! post_type_supports( $this->name, 'autosave' ) ) {
			return null;
		}

		$class = $this->autosave_rest_controller_class ? $this->autosave_rest_controller_class : WP_REST_Autosaves_Controller::class;

		if ( ! class_exists( $class ) ) {
			return null;
		}

		if ( ! is_subclass_of( $class, WP_REST_Controller::class ) ) {
			return null;
		}

		if ( ! $this->autosave_rest_controller ) {
			$this->autosave_rest_controller = new $class( $this->name );
		}

		if ( ! ( $this->autosave_rest_controller instanceof $class ) ) {
			return null;
		}

		return $this->autosave_rest_controller;
	}

	/**
	 * Returns the default labels for post types.
	 *
	 * @since 6.0.0
	 *
	 * @return (string|null)[][] The default labels for post types.
	 */
	public static function get_default_labels() {
		if ( ! empty( self::$default_labels ) ) {
			return self::$default_labels;
		}

		self::$default_labels = array(
			'name'                     => array( _x( 'Posts', 'post type general name' ), _x( 'Pages', 'post type general name' ) ),
			'singular_name'            => array( _x( 'Post', 'post type singular name' ), _x( 'Page', 'post type singular name' ) ),
			'add_new'                  => array( __( 'Add New' ), __( 'Add New' ) ),
			'add_new_item'             => array( __( 'Add New Post' ), __( 'Add New Page' ) ),
			'edit_item'                => array( __( 'Edit Post' ), __( 'Edit Page' ) ),
			'new_item'                 => array( __( 'New Post' ), __( 'New Page' ) ),
			'view_item'                => array( __( 'View Post' ), __( 'View Page' ) ),
			'view_items'               => array( __( 'View Posts' ), __( 'View Pages' ) ),
			'search_items'             => array( __( 'Search Posts' ), __( 'Search Pages' ) ),
			'not_found'                => array( __( 'No posts found.' ), __( 'No pages found.' ) ),
			'not_found_in_trash'       => array( __( 'No posts found in Trash.' ), __( 'No pages found in Trash.' ) ),
			'parent_item_colon'        => array( null, __( 'Parent Page:' ) ),
			'all_items'                => array( __( 'All Posts' ), __( 'All Pages' ) ),
			'archives'                 => array( __( 'Post Archives' ), __( 'Page Archives' ) ),
			'attributes'               => array( __( 'Post Attributes' ), __( 'Page Attributes' ) ),
			'insert_into_item'         => array( __( 'Insert into post' ), __( 'Insert into page' ) ),
			'uploaded_to_this_item'    => array( __( 'Uploaded to this post' ), __( 'Uploaded to this page' ) ),
			'featured_image'           => array( _x( 'Featured image', 'post' ), _x( 'Featured image', 'page' ) ),
			'set_featured_image'       => array( _x( 'Set featured image', 'post' ), _x( 'Set featured image', 'page' ) ),
			'remove_featured_image'    => array( _x( 'Remove featured image', 'post' ), _x( 'Remove featured image', 'page' ) ),
			'use_featured_image'       => array( _x( 'Use as featured image', 'post' ), _x( 'Use as featured image', 'page' ) ),
			'filter_items_list'        => array( __( 'Filter posts list' ), __( 'Filter pages list' ) ),
			'filter_by_date'           => array( __( 'Filter by date' ), __( 'Filter by date' ) ),
			'items_list_navigation'    => array( __( 'Posts list navigation' ), __( 'Pages list navigation' ) ),
			'items_list'               => array( __( 'Posts list' ), __( 'Pages list' ) ),
			'item_published'           => array( __( 'Post published.' ), __( 'Page published.' ) ),
			'item_published_privately' => array( __( 'Post published privately.' ), __( 'Page published privately.' ) ),
			'item_reverted_to_draft'   => array( __( 'Post reverted to draft.' ), __( 'Page reverted to draft.' ) ),
			'item_trashed'             => array( __( 'Post trashed.' ), __( 'Page trashed.' ) ),
			'item_scheduled'           => array( __( 'Post scheduled.' ), __( 'Page scheduled.' ) ),
			'item_updated'             => array( __( 'Post updated.' ), __( 'Page updated.' ) ),
			'item_link'                => array(
				_x( 'Post Link', 'navigation link block title' ),
				_x( 'Page Link', 'navigation link block title' ),
			),
			'item_link_description'    => array(
				_x( 'A link to a post.', 'navigation link block description' ),
				_x( 'A link to a page.', 'navigation link block description' ),
			),
		);

		return self::$default_labels;
	}

	/**
	 * Resets the cache for the default labels.
	 *
	 * @since 6.0.0
	 */
	public static function reset_default_labels() {
		self::$default_labels = array();
	}
}
;

		return in_array( $menu_id, $nav_menu_option['auto_add'], true );
	}

	/**
	 * Updates the menu's auto add from a REST request.
	 *
	 * @since 5.9.0
	 *
	 * @param int             $menu_id The menu id to update.
	 * @param WP_REST_Request $request Full details about the request.
	 * @return bool True if the auto add setting was successfully updated.
	 */
	protected function handle_auto_add( $menu_id, $request ) {
		if ( ! isset( $request['auto_add'] ) ) {
			return true;
		}

		$nav_menu_option = (array) get_option( 'nav_menu_options', array( 'auto_add' => array() ) );

		if ( ! isset( $nav_menu_option['auto_add'] ) ) {
			$nav_menu_option['auto_add'] = array();
		}

		$auto_add = $request['auto_add'];

		$i = array_search( $menu_id, $nav_menu_option['auto_add'], true );

		if ( $auto_add && false === $i ) {
			$nav_menu_option['auto_add'][] = $menu_id;
		} elseif ( ! $auto_add && false !== $i ) {
			array_splice( $nav_menu_option['auto_add'], $i, 1 );
		}

		$update = update_option( 'nav_menu_options', $nav_menu_option );

		/** This action is documented in wp-includes/nav-menu.php */
		do_action( 'wp_update_nav_menu', $menu_id );

		return $update;
	}

	/**
	 * Returns the names of the locations assigned to the menu.
	 *
	 * @since 5.9.0
	 *
	 * @param int $menu_id The menu id.
	 * @return string[] The locations assigned to the menu.
	 */
	protected function get_menu_locations( $menu_id ) {
		$locations      = get_nav_menu_locations();
		$menu_locations = array();

		foreach ( $locations as $location => $assigned_menu_id ) {
			if ( $menu_id === $assigned_menu_id ) {
				$menu_locations[] = $location;
			}
		}

		return $menu_locations;
	}

	/**
	 * Updates the menu's locations from a REST request.
	 *
	 * @since 5.9.0
	 *
	 * @param int             $menu_id The menu id to update.
	 * @param WP_REST_Request $request Full details about the request.
	 * @return true|WP_Error True on success, a WP_Error on an error updating any of the locations.
	 */
	protected function handle_locations( $menu_id, $request ) {
		if ( ! isset( $request['locations'] ) ) {
			return true;
		}

		$menu_locations = get_registered_nav_menus();
		$menu_locations = array_keys( $menu_locations );
		$new_locations  = array();
		foreach ( $request['locations'] as $location ) {
			if ( ! in_array( $location, $menu_locations, true ) ) {
				return new WP_Error(
					'rest_invalid_menu_location',
					__( 'Invalid menu location.' ),
					array(
						'status'   => 400,
						'location' => $location,
					)
				);
			}
			$new_locations[ $location ] = $menu_id;
		}
		$assigned_menu = get_nav_menu_locations();
		foreach ( $assigned_menu as $location => $term_id ) {
			if ( $term_id === $menu_id ) {
				unset( $assigned_menu[ $location ] );
			}
		}
		$new_assignments = array_merge( $assigned_menu, $new_locations );
		set_theme_mod( 'nav_menu_locations', $new_assignments );

		return true;
	}

	/**
	 * Retrieves the term's schema, conforming to JSON Schema.
	 *
	 * @since 5.9.0
	 *
	 * @return array Item schema data.
	 */
	public function get_item_schema() {
		if ( $this->schema ) {
			return $this->add_additional_fields_schema( $this->schema );
		}

		$schema = parent::get_item_schema();
		unset( $schema['properties']['count'], $schema['properties']['link'], $schema['properties']['taxonomy'] );

		$schema['properties']['locations'] = array(
			'description' => __( 'The locations assigned to the menu.' ),
			'type'        => 'array',
			'items'       => array(
				'type' => 'string',
			),
			'context'     => array( 'view', 'edit' ),
			'arg_options' => array(
				'validate_callback' => static function ( $locations, $request, $param ) {
					$valid = rest_validate_request_arg( $locations, $request, $param );

					if ( true !== $valid ) {
						return $valid;
					}

					$locations = rest_sanitize_request_arg( $locations, $request, $param );

					foreach ( $locations as $location ) {
						if ( ! array_key_exists( $location, get_registered_nav_menus() ) ) {
							return new WP_Error(
								'rest_invalid_menu_location',
								__( 'Invalid menu location.' ),
								array(
									'location' => $location,
								)
							);
						}
					}

					return true;
				},
			),
		);

		$schema['properties']['auto_add'] = array(
			'description' => __( 'Whether to automatically add top level pages to this menu.' ),
			'context'     => array( 'view', 'edit' ),
			'type'        => 'boolean',
		);

		$this->schema = $schema;

		return $this->add_additional_fields_schema( $this->schema );
	}
}