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/**
 * Server-side rendering of the `core/navigation` block.
 *
 * @package WordPress
 */

// These functions are used for the __unstableLocation feature and only active
// when the gutenberg plugin is active.
if ( defined( 'IS_GUTENBERG_PLUGIN' ) &amp;&amp; IS_GUTENBERG_PLUGIN ) {
	/**
	 * Returns the menu items for a WordPress menu location.
	 *
	 * @param string $location The menu location.
	 * @return array Menu items for the location.
	 */
	function block_core_navigation_get_menu_items_at_location( $location ) {
		if ( empty( $location ) ) {
			return;
		}

		// Build menu data. The following approximates the code in
		// `wp_nav_menu()` and `gutenberg_output_block_nav_menu`.

		// Find the location in the list of locations, returning early if the
		// location can't be found.
		$locations = get_nav_menu_locations();
		if ( ! isset( $locations[ $location ] ) ) {
			return;
		}

		// Get the menu from the location, returning early if there is no
		// menu or there was an error.
		$menu = wp_get_nav_menu_object( $locations[ $location ] );
		if ( ! $menu || is_wp_error( $menu ) ) {
			return;
		}

		$menu_items = wp_get_nav_menu_items( $menu-&gt;term_id, array( 'update_post_term_cache' =&gt; false ) );
		_wp_menu_item_classes_by_context( $menu_items );

		return $menu_items;
	}


	/**
	 * Sorts a standard array of menu items into a nested structure keyed by the
	 * id of the parent menu.
	 *
	 * @param array $menu_items Menu items to sort.
	 * @return array An array keyed by the id of the parent menu where each element
	 *               is an array of menu items that belong to that parent.
	 */
	function block_core_navigation_sort_menu_items_by_parent_id( $menu_items ) {
		$sorted_menu_items = array();
		foreach ( (array) $menu_items as $menu_item ) {
			$sorted_menu_items[ $menu_item-&gt;menu_order ] = $menu_item;
		}
		unset( $menu_items, $menu_item );

		$menu_items_by_parent_id = array();
		foreach ( $sorted_menu_items as $menu_item ) {
			$menu_items_by_parent_id[ $menu_item-&gt;menu_item_parent ][] = $menu_item;
		}

		return $menu_items_by_parent_id;
	}
}

/**
 * Turns menu item data into a nested array of parsed blocks
 *
 * @param array $menu_items               An array of menu items that represent
 *                                        an individual level of a menu.
 * @param array $menu_items_by_parent_id  An array keyed by the id of the
 *                                        parent menu where each element is an
 *                                        array of menu items that belong to
 *                                        that parent.
 * @return array An array of parsed block data.
 */
function block_core_navigation_parse_blocks_from_menu_items( $menu_items, $menu_items_by_parent_id ) {
	if ( empty( $menu_items ) ) {
		return array();
	}

	$blocks = array();

	foreach ( $menu_items as $menu_item ) {
		$class_name       = ! empty( $menu_item-&gt;classes ) ? implode( ' ', (array) $menu_item-&gt;classes ) : null;
		$id               = ( null !== $menu_item-&gt;object_id &amp;&amp; 'custom' !== $menu_item-&gt;object ) ? $menu_item-&gt;object_id : null;
		$opens_in_new_tab = null !== $menu_item-&gt;target &amp;&amp; '_blank' === $menu_item-&gt;target;
		$rel              = ( null !== $menu_item-&gt;xfn &amp;&amp; '' !== $menu_item-&gt;xfn ) ? $menu_item-&gt;xfn : null;
		$kind             = null !== $menu_item-&gt;type ? str_replace( '_', '-', $menu_item-&gt;type ) : 'custom';

		$block = array(
			'blockName' =&gt; isset( $menu_items_by_parent_id[ $menu_item-&gt;ID ] ) ? 'core/navigation-submenu' : 'core/navigation-link',
			'attrs'     =&gt; array(
				'className'     =&gt; $class_name,
				'description'   =&gt; $menu_item-&gt;description,
				'id'            =&gt; $id,
				'kind'          =&gt; $kind,
				'label'         =&gt; $menu_item-&gt;title,
				'opensInNewTab' =&gt; $opens_in_new_tab,
				'rel'           =&gt; $rel,
				'title'         =&gt; $menu_item-&gt;attr_title,
				'type'          =&gt; $menu_item-&gt;object,
				'url'           =&gt; $menu_item-&gt;url,
			),
		);

		$block['innerBlocks']  = isset( $menu_items_by_parent_id[ $menu_item-&gt;ID ] )
			? block_core_navigation_parse_blocks_from_menu_items( $menu_items_by_parent_id[ $menu_item-&gt;ID ], $menu_items_by_parent_id )
			: array();
		$block['innerContent'] = array_map( 'serialize_block', $block['innerBlocks'] );

		$blocks[] = $block;
	}

	return $blocks;
}

/**
 * Build an array with CSS classes and inline styles defining the colors
 * which will be applied to the navigation markup in the front-end.
 *
 * @param array $attributes Navigation block attributes.
 *
 * @return array Colors CSS classes and inline styles.
 */
function block_core_navigation_build_css_colors( $attributes ) {
	$colors = array(
		'css_classes'           =&gt; array(),
		'inline_styles'         =&gt; '',
		'overlay_css_classes'   =&gt; array(),
		'overlay_inline_styles' =&gt; '',
	);

	// Text color.
	$has_named_text_color  = array_key_exists( 'textColor', $attributes );
	$has_custom_text_color = array_key_exists( 'customTextColor', $attributes );

	// If has text color.
	if ( $has_custom_text_color || $has_named_text_color ) {
		// Add has-text-color class.
		$colors['css_classes'][] = 'has-text-color';
	}

	if ( $has_named_text_color ) {
		// Add the color class.
		$colors['css_classes'][] = sprintf( 'has-%s-color', $attributes['textColor'] );
	} elseif ( $has_custom_text_color ) {
		// Add the custom color inline style.
		$colors['inline_styles'] .= sprintf( 'color: %s;', $attributes['customTextColor'] );
	}

	// Background color.
	$has_named_background_color  = array_key_exists( 'backgroundColor', $attributes );
	$has_custom_background_color = array_key_exists( 'customBackgroundColor', $attributes );

	// If has background color.
	if ( $has_custom_background_color || $has_named_background_color ) {
		// Add has-background class.
		$colors['css_classes'][] = 'has-background';
	}

	if ( $has_named_background_color ) {
		// Add the background-color class.
		$colors['css_classes'][] = sprintf( 'has-%s-background-color', $attributes['backgroundColor'] );
	} elseif ( $has_custom_background_color ) {
		// Add the custom background-color inline style.
		$colors['inline_styles'] .= sprintf( 'background-color: %s;', $attributes['customBackgroundColor'] );
	}

	// Overlay text color.
	$has_named_overlay_text_color  = array_key_exists( 'overlayTextColor', $attributes );
	$has_custom_overlay_text_color = array_key_exists( 'customOverlayTextColor', $attributes );

	// If has overlay text color.
	if ( $has_custom_overlay_text_color || $has_named_overlay_text_color ) {
		// Add has-text-color class.
		$colors['overlay_css_classes'][] = 'has-text-color';
	}

	if ( $has_named_overlay_text_color ) {
		// Add the overlay color class.
		$colors['overlay_css_classes'][] = sprintf( 'has-%s-color', $attributes['overlayTextColor'] );
	} elseif ( $has_custom_overlay_text_color ) {
		// Add the custom overlay color inline style.
		$colors['overlay_inline_styles'] .= sprintf( 'color: %s;', $attributes['customOverlayTextColor'] );
	}

	// Overlay background color.
	$has_named_overlay_background_color  = array_key_exists( 'overlayBackgroundColor', $attributes );
	$has_custom_overlay_background_color = array_key_exists( 'customOverlayBackgroundColor', $attributes );

	// If has overlay background color.
	if ( $has_custom_overlay_background_color || $has_named_overlay_background_color ) {
		// Add has-background class.
		$colors['overlay_css_classes'][] = 'has-background';
	}

	if ( $has_named_overlay_background_color ) {
		// Add the overlay background-color class.
		$colors['overlay_css_classes'][] = sprintf( 'has-%s-background-color', $attributes['overlayBackgroundColor'] );
	} elseif ( $has_custom_overlay_background_color ) {
		// Add the custom overlay background-color inline style.
		$colors['overlay_inline_styles'] .= sprintf( 'background-color: %s;', $attributes['customOverlayBackgroundColor'] );
	}

	return $colors;
}

/**
 * Build an array with CSS classes and inline styles defining the font sizes
 * which will be applied to the navigation markup in the front-end.
 *
 * @param array $attributes Navigation block attributes.
 *
 * @return array Font size CSS classes and inline styles.
 */
function block_core_navigation_build_css_font_sizes( $attributes ) {
	// CSS classes.
	$font_sizes = array(
		'css_classes'   =&gt; array(),
		'inline_styles' =&gt; '',
	);

	$has_named_font_size  = array_key_exists( 'fontSize', $attributes );
	$has_custom_font_size = array_key_exists( 'customFontSize', $attributes );

	if ( $has_named_font_size ) {
		// Add the font size class.
		$font_sizes['css_classes'][] = sprintf( 'has-%s-font-size', $attributes['fontSize'] );
	} elseif ( $has_custom_font_size ) {
		// Add the custom font size inline style.
		$font_sizes['inline_styles'] = sprintf( 'font-size: %spx;', $attributes['customFontSize'] );
	}

	return $font_sizes;
}

/**
 * Returns the top-level submenu SVG chevron icon.
 *
 * @return string
 */
function block_core_navigation_render_submenu_icon() {
	return '&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; width=&quot;12&quot; height=&quot;12&quot; viewBox=&quot;0 0 12 12&quot; fill=&quot;none&quot; aria-hidden=&quot;true&quot; focusable=&quot;false&quot;&gt;&lt;path d=&quot;M1.50002 4L6.00002 8L10.5 4&quot; stroke-width=&quot;1.5&quot;&gt;&lt;/path&gt;&lt;/svg&gt;';
}

/**
 * Get the classic navigation menu to use as a fallback.
 *
 * @return object WP_Term The classic navigation.
 */
function block_core_navigation_get_classic_menu_fallback() {
	$classic_nav_menus = wp_get_nav_menus();

	// If menus exist.
	if ( $classic_nav_menus &amp;&amp; ! is_wp_error( $classic_nav_menus ) ) {
		// Handles simple use case where user has a classic menu and switches to a block theme.

		// Returns the menu assigned to location `primary`.
		$locations = get_nav_menu_locations();
		if ( isset( $locations['primary'] ) ) {
			$primary_menu = wp_get_nav_menu_object( $locations['primary'] );
			if ( $primary_menu ) {
				return $primary_menu;
			}
		}

		// Returns a menu if `primary` is its slug.
		foreach ( $classic_nav_menus as $classic_nav_menu ) {
			if ( 'primary' === $classic_nav_menu-&gt;slug ) {
				return $classic_nav_menu;
			}
		}

		// Otherwise return the most recently created classic menu.
		usort(
			$classic_nav_menus,
			function( $a, $b ) {
				return $b-&gt;term_id - $a-&gt;term_id;
			}
		);
		return $classic_nav_menus[0];
	}
}

/**
 * Converts a classic navigation to blocks.
 *
 * @param  object $classic_nav_menu WP_Term The classic navigation object to convert.
 * @return array the normalized parsed blocks.
 */
function block_core_navigation_get_classic_menu_fallback_blocks( $classic_nav_menu ) {
	// BEGIN: Code that already exists in wp_nav_menu().
	$menu_items = wp_get_nav_menu_items( $classic_nav_menu-&gt;term_id, array( 'update_post_term_cache' =&gt; false ) );

	// Set up the $menu_item variables.
	_wp_menu_item_classes_by_context( $menu_items );

	$sorted_menu_items = array();
	foreach ( (array) $menu_items as $menu_item ) {
		$sorted_menu_items[ $menu_item-&gt;menu_order ] = $menu_item;
	}

	unset( $menu_items, $menu_item );

	// END: Code that already exists in wp_nav_menu().

	$menu_items_by_parent_id = array();
	foreach ( $sorted_menu_items as $menu_item ) {
		$menu_items_by_parent_id[ $menu_item-&gt;menu_item_parent ][] = $menu_item;
	}

	$inner_blocks = block_core_navigation_parse_blocks_from_menu_items(
		isset( $menu_items_by_parent_id[0] )
			? $menu_items_by_parent_id[0]
			: array(),
		$menu_items_by_parent_id
	);

	return serialize_blocks( $inner_blocks );
}

/**
 * If there's a the classic menu then use it as a fallback.
 *
 * @return array the normalized parsed blocks.
 */
function block_core_navigation_maybe_use_classic_menu_fallback() {
	// See if we have a classic menu.
	$classic_nav_menu = block_core_navigation_get_classic_menu_fallback();

	if ( ! $classic_nav_menu ) {
		return;
	}

	// If we have a classic menu then convert it to blocks.
	$classic_nav_menu_blocks = block_core_navigation_get_classic_menu_fallback_blocks( $classic_nav_menu );

	if ( empty( $classic_nav_menu_blocks ) ) {
		return;
	}

	// Create a new navigation menu from the classic menu.
	$wp_insert_post_result = wp_insert_post(
		array(
			'post_content' =&gt; $classic_nav_menu_blocks,
			'post_title'   =&gt; $classic_nav_menu-&gt;slug,
			'post_name'    =&gt; $classic_nav_menu-&gt;slug,
			'post_status'  =&gt; 'publish',
			'post_type'    =&gt; 'wp_navigation',
		),
		true // So that we can check whether the result is an error.
	);

	if ( is_wp_error( $wp_insert_post_result ) ) {
		return;
	}

	// Fetch the most recently published navigation which will be the classic one created above.
	return block_core_navigation_get_most_recently_published_navigation();
}

/**
 * Finds the most recently published `wp_navigation` Post.
 *
 * @return WP_Post|null the first non-empty Navigation or null.
 */
function block_core_navigation_get_most_recently_published_navigation() {

	// Default to the most recently created menu.
	$parsed_args = array(
		'post_type'              =&gt; 'wp_navigation',
		'no_found_rows'          =&gt; true,
		'update_post_meta_cache' =&gt; false,
		'update_post_term_cache' =&gt; false,
		'order'                  =&gt; 'DESC',
		'orderby'                =&gt; 'date',
		'post_status'            =&gt; 'publish',
		'posts_per_page'         =&gt; 1, // get only the most recent.
	);

	$navigation_post = new WP_Query( $parsed_args );
	if ( count( $navigation_post-&gt;posts ) &gt; 0 ) {
		return $navigation_post-&gt;posts[0];
	}

	return null;
}

/**
 * Filter out empty &quot;null&quot; blocks from the block list.
 * 'parse_blocks' includes a null block with '\n\n' as the content when
 * it encounters whitespace. This is not a bug but rather how the parser
 * is designed.
 *
 * @param array $parsed_blocks the parsed blocks to be normalized.
 * @return array the normalized parsed blocks.
 */
function block_core_navigation_filter_out_empty_blocks( $parsed_blocks ) {
	$filtered = array_filter(
		$parsed_blocks,
		function( $block ) {
			return isset( $block['blockName'] );
		}
	);

	// Reset keys.
	return array_values( $filtered );
}

/**
 * Returns true if the navigation block contains a nested navigation block.
 *
 * @param WP_Block_List $inner_blocks Inner block instance to be normalized.
 * @return bool true if the navigation block contains a nested navigation block.
 */
function block_core_navigation_block_contains_core_navigation( $inner_blocks ) {
	foreach ( $inner_blocks as $block ) {
		if ( 'core/navigation' === $block-&gt;name ) {
			return true;
		}
		if ( $block-&gt;inner_blocks &amp;&amp; block_core_navigation_block_contains_core_navigation( $block-&gt;inner_blocks ) ) {
			return true;
		}
	}

	return false;
}

/**
 * Retrieves the appropriate fallback to be used on the front of the
 * site when there is no menu assigned to the Nav block.
 *
 * This aims to mirror how the fallback mechanic for wp_nav_menu works.
 * See https://developer.wordpress.org/reference/functions/wp_nav_menu/#more-information.
 *
 * @return array the array of blocks to be used as a fallback.
 */
function block_core_navigation_get_fallback_blocks() {
	$page_list_fallback = array(
		array(
			'blockName' =&gt; 'core/page-list',
		),
	);

	$registry = WP_Block_Type_Registry::get_instance();

	// If `core/page-list` is not registered then return empty blocks.
	$fallback_blocks = $registry-&gt;is_registered( 'core/page-list' ) ? $page_list_fallback : array();

	// Default to a list of Pages.

	$navigation_post = block_core_navigation_get_most_recently_published_navigation();

	// If there are no navigation posts then try to find a classic menu
	// and convert it into a block based navigation menu.
	if ( ! $navigation_post ) {
		$navigation_post = block_core_navigation_maybe_use_classic_menu_fallback();
	}

	// Use the first non-empty Navigation as fallback if available.
	if ( $navigation_post ) {
		$parsed_blocks  = parse_blocks( $navigation_post-&gt;post_content );
		$maybe_fallback = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

		// Normalizing blocks may result in an empty array of blocks if they were all `null` blocks.
		// In this case default to the (Page List) fallback.
		$fallback_blocks = ! empty( $maybe_fallback ) ? $maybe_fallback : $fallback_blocks;
	}

	/**
	 * Filters the fallback experience for the Navigation block.
	 *
	 * Returning a falsey value will opt out of the fallback and cause the block not to render.
	 * To customise the blocks provided return an array of blocks - these should be valid
	 * children of the `core/navigation` block.
	 *
	 * @since 5.9.0
	 *
	 * @param array[] default fallback blocks provided by the default block mechanic.
	 */
	return apply_filters( 'block_core_navigation_render_fallback', $fallback_blocks );
}

/**
 * Iterate through all inner blocks recursively and get navigation link block's post IDs.
 *
 * @param WP_Block_List $inner_blocks Block list class instance.
 *
 * @return array Array of post IDs.
 */
function block_core_navigation_get_post_ids( $inner_blocks ) {
	$post_ids = array_map( 'block_core_navigation_from_block_get_post_ids', iterator_to_array( $inner_blocks ) );
	return array_unique( array_merge( ...$post_ids ) );
}

/**
 * Get post IDs from a navigation link block instance.
 *
 * @param WP_Block $block Instance of a block.
 *
 * @return array Array of post IDs.
 */
function block_core_navigation_from_block_get_post_ids( $block ) {
	$post_ids = array();

	if ( $block-&gt;inner_blocks ) {
		$post_ids = block_core_navigation_get_post_ids( $block-&gt;inner_blocks );
	}

	if ( 'core/navigation-link' === $block-&gt;name || 'core/navigation-submenu' === $block-&gt;name ) {
		if ( $block-&gt;attributes &amp;&amp; isset( $block-&gt;attributes['kind'] ) &amp;&amp; 'post-type' === $block-&gt;attributes['kind'] &amp;&amp; isset( $block-&gt;attributes['id'] ) ) {
			$post_ids[] = $block-&gt;attributes['id'];
		}
	}

	return $post_ids;
}

/**
 * Renders the `core/navigation` block on server.
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The saved content.
 * @param WP_Block $block      The parsed block.
 *
 * @return string Returns the post content with the legacy widget added.
 */
function render_block_core_navigation( $attributes, $content, $block ) {

	static $seen_menu_names = array();

	// Flag used to indicate whether the rendered output is considered to be
	// a fallback (i.e. the block has no menu associated with it).
	$is_fallback = false;

	$nav_menu_name = '';

	/**
	 * Deprecated:
	 * The rgbTextColor and rgbBackgroundColor attributes
	 * have been deprecated in favor of
	 * customTextColor and customBackgroundColor ones.
	 * Move the values from old attrs to the new ones.
	 */
	if ( isset( $attributes['rgbTextColor'] ) &amp;&amp; empty( $attributes['textColor'] ) ) {
		$attributes['customTextColor'] = $attributes['rgbTextColor'];
	}

	if ( isset( $attributes['rgbBackgroundColor'] ) &amp;&amp; empty( $attributes['backgroundColor'] ) ) {
		$attributes['customBackgroundColor'] = $attributes['rgbBackgroundColor'];
	}

	unset( $attributes['rgbTextColor'], $attributes['rgbBackgroundColor'] );

	/**
	 * This is for backwards compatibility after `isResponsive` attribute has been removed.
	 */
	$has_old_responsive_attribute = ! empty( $attributes['isResponsive'] ) &amp;&amp; $attributes['isResponsive'];
	$is_responsive_menu           = isset( $attributes['overlayMenu'] ) &amp;&amp; 'never' !== $attributes['overlayMenu'] || $has_old_responsive_attribute;
	$should_load_view_script      = ! wp_script_is( 'wp-block-navigation-view' ) &amp;&amp; ( $is_responsive_menu || $attributes['openSubmenusOnClick'] || $attributes['showSubmenuIcon'] );
	if ( $should_load_view_script ) {
		wp_enqueue_script( 'wp-block-navigation-view' );
	}

	$should_load_modal_view_script = isset( $attributes['overlayMenu'] ) &amp;&amp; 'never' !== $attributes['overlayMenu'];
	if ( $should_load_modal_view_script ) {
		wp_enqueue_script( 'wp-block-navigation-view-modal' );
	}

	$inner_blocks = $block-&gt;inner_blocks;

	// Ensure that blocks saved with the legacy ref attribute name (navigationMenuId) continue to render.
	if ( array_key_exists( 'navigationMenuId', $attributes ) ) {
		$attributes['ref'] = $attributes['navigationMenuId'];
	}

	// If:
	// - the gutenberg plugin is active
	// - `__unstableLocation` is defined
	// - we have menu items at the defined location
	// - we don't have a relationship to a `wp_navigation` Post (via `ref`).
	// ...then create inner blocks from the classic menu assigned to that location.
	if (
		defined( 'IS_GUTENBERG_PLUGIN' ) &amp;&amp; IS_GUTENBERG_PLUGIN &amp;&amp;
		array_key_exists( '__unstableLocation', $attributes ) &amp;&amp;
		! array_key_exists( 'ref', $attributes ) &amp;&amp;
		! empty( block_core_navigation_get_menu_items_at_location( $attributes['__unstableLocation'] ) )
	) {
		$menu_items = block_core_navigation_get_menu_items_at_location( $attributes['__unstableLocation'] );
		if ( empty( $menu_items ) ) {
			return '';
		}

		$menu_items_by_parent_id = block_core_navigation_sort_menu_items_by_parent_id( $menu_items );
		$parsed_blocks           = block_core_navigation_parse_blocks_from_menu_items( $menu_items_by_parent_id[0], $menu_items_by_parent_id );
		$inner_blocks            = new WP_Block_List( $parsed_blocks, $attributes );
	}

	// Load inner blocks from the navigation post.
	if ( array_key_exists( 'ref', $attributes ) ) {
		$navigation_post = get_post( $attributes['ref'] );
		if ( ! isset( $navigation_post ) ) {
			return '';
		}

		// Only published posts are valid. If this is changed then a corresponding change
		// must also be implemented in `use-navigation-menu.js`.
		if ( 'publish' === $navigation_post-&gt;post_status ) {
			$nav_menu_name = $navigation_post-&gt;post_title;

			if ( isset( $seen_menu_names[ $nav_menu_name ] ) ) {
				++$seen_menu_names[ $nav_menu_name ];
			} else {
				$seen_menu_names[ $nav_menu_name ] = 1;
			}

			$parsed_blocks = parse_blocks( $navigation_post-&gt;post_content );

			// 'parse_blocks' includes a null block with '\n\n' as the content when
			// it encounters whitespace. This code strips it.
			$compacted_blocks = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

			// TODO - this uses the full navigation block attributes for the
			// context which could be refined.
			$inner_blocks = new WP_Block_List( $compacted_blocks, $attributes );
		}
	}

	// If there are no inner blocks then fallback to rendering an appropriate fallback.
	if ( empty( $inner_blocks ) ) {
		$is_fallback = true; // indicate we are rendering the fallback.

		$fallback_blocks = block_core_navigation_get_fallback_blocks();

		// Fallback my have been filtered so do basic test for validity.
		if ( empty( $fallback_blocks ) || ! is_array( $fallback_blocks ) ) {
			return '';
		}

		$inner_blocks = new WP_Block_List( $fallback_blocks, $attributes );
	}

	if ( block_core_navigation_block_contains_core_navigation( $inner_blocks ) ) {
		return '';
	}

	/**
	 * Filter navigation block $inner_blocks.
	 * Allows modification of a navigation block menu items.
	 *
	 * @since 6.1.0
	 *
	 * @param \WP_Block_List $inner_blocks
	 */
	$inner_blocks = apply_filters( 'block_core_navigation_render_inner_blocks', $inner_blocks );

	$layout_justification = array(
		'left'          =&gt; 'items-justified-left',
		'right'         =&gt; 'items-justified-right',
		'center'        =&gt; 'items-justified-center',
		'space-between' =&gt; 'items-justified-space-between',
	);

	// Restore legacy classnames for submenu positioning.
	$layout_class = '';
	if ( isset( $attributes['layout']['justifyContent'] ) ) {
		$layout_class .= $layout_justification[ $attributes['layout']['justifyContent'] ];
	}
	if ( isset( $attributes['layout']['orientation'] ) &amp;&amp; 'vertical' === $attributes['layout']['orientation'] ) {
		$layout_class .= ' is-vertical';
	}

	if ( isset( $attributes['layout']['flexWrap'] ) &amp;&amp; 'nowrap' === $attributes['layout']['flexWrap'] ) {
		$layout_class .= ' no-wrap';
	}

	// Manually add block support text decoration as CSS class.
	$text_decoration       = _wp_array_get( $attributes, array( 'style', 'typography', 'textDecoration' ), null );
	$text_decoration_class = sprintf( 'has-text-decoration-%s', $text_decoration );

	$colors     = block_core_navigation_build_css_colors( $attributes );
	$font_sizes = block_core_navigation_build_css_font_sizes( $attributes );
	$classes    = array_merge(
		$colors['css_classes'],
		$font_sizes['css_classes'],
		$is_responsive_menu ? array( 'is-responsive' ) : array(),
		$layout_class ? array( $layout_class ) : array(),
		$is_fallback ? array( 'is-fallback' ) : array(),
		$text_decoration ? array( $text_decoration_class ) : array()
	);

	$post_ids = block_core_navigation_get_post_ids( $inner_blocks );
	if ( $post_ids ) {
		_prime_post_caches( $post_ids, false, false );
	}

	$list_item_nav_blocks = array(
		'core/navigation-link',
		'core/home-link',
		'core/site-title',
		'core/site-logo',
		'core/navigation-submenu',
	);

	$needs_list_item_wrapper = array(
		'core/site-title',
		'core/site-logo',
	);

	$inner_blocks_html = '';
	$is_list_open      = false;
	foreach ( $inner_blocks as $inner_block ) {
		$is_list_item = in_array( $inner_block-&gt;name, $list_item_nav_blocks, true );

		if ( $is_list_item &amp;&amp; ! $is_list_open ) {
			$is_list_open       = true;
			$inner_blocks_html .= '&lt;ul class=&quot;wp-block-navigation__container&quot;&gt;';
		}

		if ( ! $is_list_item &amp;&amp; $is_list_open ) {
			$is_list_open       = false;
			$inner_blocks_html .= '&lt;/ul&gt;';
		}

		$inner_block_content = $inner_block-&gt;render();
		if ( ! empty( $inner_block_content ) ) {
			if ( in_array( $inner_block-&gt;name, $needs_list_item_wrapper, true ) ) {
				$inner_blocks_html .= '&lt;li class=&quot;wp-block-navigation-item&quot;&gt;' . $inner_block_content . '&lt;/li&gt;';
			} else {
				$inner_blocks_html .= $inner_block_content;
			}
		}
	}

	if ( $is_list_open ) {
		$inner_blocks_html .= '&lt;/ul&gt;';
	}

	$block_styles = isset( $attributes['styles'] ) ? $attributes['styles'] : '';

	// If the menu name has been used previously then append an ID
	// to the name to ensure uniqueness across a given post.
	if ( isset( $seen_menu_names[ $nav_menu_name ] ) &amp;&amp; $seen_menu_names[ $nav_menu_name ] &gt; 1 ) {
		$count         = $seen_menu_names[ $nav_menu_name ];
		$nav_menu_name = $nav_menu_name . ' ' . ( $count );
	}

	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			'class'      =&gt; implode( ' ', $classes ),
			'style'      =&gt; $block_styles . $colors['inline_styles'] . $font_sizes['inline_styles'],
			'aria-label' =&gt; $nav_menu_name,
		)
	);

	$modal_unique_id = wp_unique_id( 'modal-' );

	// Determine whether or not navigation elements should be wrapped in the markup required to make it responsive,
	// return early if they don't.
	if ( ! $is_responsive_menu ) {
		return sprintf(
			'&lt;nav %1$s&gt;%2$s&lt;/nav&gt;',
			$wrapper_attributes,
			$inner_blocks_html
		);
	}

	$is_hidden_by_default = isset( $attributes['overlayMenu'] ) &amp;&amp; 'always' === $attributes['overlayMenu'];

	$responsive_container_classes = array(
		'wp-block-navigation__responsive-container',
		$is_hidden_by_default ? 'hidden-by-default' : '',
		implode( ' ', $colors['overlay_css_classes'] ),
	);
	$open_button_classes          = array(
		'wp-block-navigation__responsive-container-open',
		$is_hidden_by_default ? 'always-shown' : '',
	);

	$should_display_icon_label = isset( $attributes['hasIcon'] ) &amp;&amp; true === $attributes['hasIcon'];
	$toggle_button_icon        = '&lt;svg width=&quot;24&quot; height=&quot;24&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot; viewBox=&quot;0 0 24 24&quot; aria-hidden=&quot;true&quot; focusable=&quot;false&quot;&gt;&lt;rect x=&quot;4&quot; y=&quot;7.5&quot; width=&quot;16&quot; height=&quot;1.5&quot; /&gt;&lt;rect x=&quot;4&quot; y=&quot;15&quot; width=&quot;16&quot; height=&quot;1.5&quot; /&gt;&lt;/svg&gt;';
	if ( isset( $attributes['icon'] ) ) {
		if ( 'menu' === $attributes['icon'] ) {
			$toggle_button_icon = '&lt;svg width=&quot;24&quot; height=&quot;24&quot; xmlns=&quot;http://www.w3.org/2000/svg&quot; viewBox=&quot;0 0 24 24&quot;&gt;&lt;path d=&quot;M5 5v1.5h14V5H5zm0 7.8h14v-1.5H5v1.5zM5 19h14v-1.5H5V19z&quot; /&gt;&lt;/svg&gt;';
		}
	}
	$toggle_button_content       = $should_display_icon_label ? $toggle_button_icon : __( 'Menu' );
	$toggle_close_button_icon    = '&lt;svg xmlns=&quot;http://www.w3.org/2000/svg&quot; viewBox=&quot;0 0 24 24&quot; width=&quot;24&quot; height=&quot;24&quot; aria-hidden=&quot;true&quot; focusable=&quot;false&quot;&gt;&lt;path d=&quot;M13 11.8l6.1-6.3-1-1-6.1 6.2-6.1-6.2-1 1 6.1 6.3-6.5 6.7 1 1 6.5-6.6 6.5 6.6 1-1z&quot;&gt;&lt;/path&gt;&lt;/svg&gt;';
	$toggle_close_button_content = $should_display_icon_label ? $toggle_close_button_icon : __( 'Close' );
	$toggle_aria_label_open      = $should_display_icon_label ? 'aria-label=&quot;' . __( 'Open menu' ) . '&quot;' : ''; // Open button label.
	$toggle_aria_label_close     = $should_display_icon_label ? 'aria-label=&quot;' . __( 'Close menu' ) . '&quot;' : ''; // Close button label.

	$responsive_container_markup = sprintf(
		'&lt;button aria-haspopup=&quot;true&quot; %3$s class=&quot;%6$s&quot; data-micromodal-trigger=&quot;%1$s&quot;&gt;%9$s&lt;/button&gt;
			&lt;div class=&quot;%5$s&quot; style=&quot;%7$s&quot; id=&quot;%1$s&quot;&gt;
				&lt;div class=&quot;wp-block-navigation__responsive-close&quot; tabindex=&quot;-1&quot; data-micromodal-close&gt;
					&lt;div class=&quot;wp-block-navigation__responsive-dialog&quot; aria-label=&quot;%8$s&quot;&gt;
							&lt;button %4$s data-micromodal-close class=&quot;wp-block-navigation__responsive-container-close&quot;&gt;%10$s&lt;/button&gt;
						&lt;div class=&quot;wp-block-navigation__responsive-container-content&quot; id=&quot;%1$s-content&quot;&gt;
							%2$s
						&lt;/div&gt;
					&lt;/div&gt;
				&lt;/div&gt;
			&lt;/div&gt;',
		esc_attr( $modal_unique_id ),
		$inner_blocks_html,
		$toggle_aria_label_open,
		$toggle_aria_label_close,
		esc_attr( implode( ' ', $responsive_container_classes ) ),
		esc_attr( implode( ' ', $open_button_classes ) ),
		esc_attr( safecss_filter_attr( $colors['overlay_inline_styles'] ) ),
		__( 'Menu' ),
		$toggle_button_content,
		$toggle_close_button_content
	);

	return sprintf(
		'&lt;nav %1$s&gt;%2$s&lt;/nav&gt;',
		$wrapper_attributes,
		$responsive_container_markup
	);
}

/**
 * Register the navigation block.
 *
 * @uses render_block_core_navigation()
 * @throws WP_Error An WP_Error exception parsing the block definition.
 */
function register_block_core_navigation() {
	register_block_type_from_metadata(
		__DIR__ . '/navigation',
		array(
			'render_callback' =&gt; 'render_block_core_navigation',
		)
	);
}

add_action( 'init', 'register_block_core_navigation' );

/**
 * Filter that changes the parsed attribute values of navigation blocks contain typographic presets to contain the values directly.
 *
 * @param array $parsed_block The block being rendered.
 *
 * @return array The block being rendered without typographic presets.
 */
function block_core_navigation_typographic_presets_backcompatibility( $parsed_block ) {
	if ( 'core/navigation' === $parsed_block['blockName'] ) {
		$attribute_to_prefix_map = array(
			'fontStyle'      =&gt; 'var:preset|font-style|',
			'fontWeight'     =&gt; 'var:preset|font-weight|',
			'textDecoration' =&gt; 'var:preset|text-decoration|',
			'textTransform'  =&gt; 'var:preset|text-transform|',
		);
		foreach ( $attribute_to_prefix_map as $style_attribute =&gt; $prefix ) {
			if ( ! empty( $parsed_block['attrs']['style']['typography'][ $style_attribute ] ) ) {
				$prefix_len      = strlen( $prefix );
				$attribute_value = &amp;$parsed_block['attrs']['style']['typography'][ $style_attribute ];
				if ( 0 === strncmp( $attribute_value, $prefix, $prefix_len ) ) {
					$attribute_value = substr( $attribute_value, $prefix_len );
				}
				if ( 'textDecoration' === $style_attribute &amp;&amp; 'strikethrough' === $attribute_value ) {
					$attribute_value = 'line-through';
				}
			}
		}
	}

	return $parsed_block;
}

add_filter( 'render_block_data', 'block_core_navigation_typographic_presets_backcompatibility' );
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