TwentyTwenty_Walker_Page

17	class TwentyTwenty_Walker_Page extends Walker_Page {18 19		/**20		 * Outputs the beginning of the current element in the tree.21		 *22		 * @since Twenty Twenty 1.023		 * @since Twenty Twenty 1.9 Renamed `$page` to `$data_object` and `$current_page` to `$current_object_id`24		 *                          to match parent class for PHP 8 named parameter support.25		 *26		 * @see Walker::start_el()27		 *28		 * @param string  $output            Used to append additional content. Passed by reference.29		 * @param WP_Post $data_object       Page data object.30		 * @param int     $depth             Optional. Depth of page. Used for padding. Default 0.31		 * @param array   $args              Optional. Array of arguments. Default empty array.32		 * @param int     $current_object_id Optional. ID of the current page. Default 0.33		 */34		public function start_el( &$output, $data_object, $depth = 0, $args = array(), $current_object_id = 0 ) {35			// Restores the more descriptive, specific name for use within this method.36			$page            = $data_object;37			$current_page_id = $current_object_id;38 39			if ( isset( $args['item_spacing'] ) && 'preserve' === $args['item_spacing'] ) {40				$t = "\t";41			} else {42				$t = '';43			}44			if ( $depth ) {45				$indent = str_repeat( $t, $depth );46			} else {47				$indent = '';48			}49 50			$css_class = array( 'page_item', 'page-item-' . $page->ID );51 52			if ( isset( $args['pages_with_children'][ $page->ID ] ) ) {53				$css_class[] = 'page_item_has_children';54			}55 56			if ( ! empty( $current_page_id ) ) {57				$_current_page = get_post( $current_page_id );58				if ( $_current_page && in_array( $page->ID, $_current_page->ancestors, true ) ) {59					$css_class[] = 'current_page_ancestor';60				}61				if ( $page->ID === $current_page_id ) {62					$css_class[] = 'current_page_item';63				} elseif ( $_current_page && $page->ID === $_current_page->post_parent ) {64					$css_class[] = 'current_page_parent';65				}66			} elseif ( get_option( 'page_for_posts' ) === $page->ID ) {67				$css_class[] = 'current_page_parent';68			}69 70			/** This filter is documented in wp-includes/class-walker-page.php */71			$css_classes = implode( ' ', apply_filters( 'page_css_class', $css_class, $page, $depth, $args, $current_page_id ) );72			$css_classes = $css_classes ? ' class="' . esc_attr( $css_classes ) . '"' : '';73 74			if ( '' === $page->post_title ) {75				/* translators: %d: ID of a post. */76				$page->post_title = sprintf( __( '#%d (no title)', 'twentytwenty' ), $page->ID );77			}78 79			$args['link_before'] = empty( $args['link_before'] ) ? '' : $args['link_before'];80			$args['link_after']  = empty( $args['link_after'] ) ? '' : $args['link_after'];81 82			$atts                 = array();83			$atts['href']         = get_permalink( $page->ID );84			$atts['aria-current'] = ( $page->ID === $current_page_id ) ? 'page' : '';85 86			/** This filter is documented in wp-includes/class-walker-page.php */87			$atts = apply_filters( 'page_menu_link_attributes', $atts, $page, $depth, $args, $current_page_id );88 89			$attributes = '';90			foreach ( $atts as $attr => $value ) {91				if ( ! empty( $value ) ) {92					$value       = ( 'href' === $attr ) ? esc_url( $value ) : esc_attr( $value );93					$attributes .= ' ' . $attr . '="' . $value . '"';94				}95			}96