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

/**
 * 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 );
		return ( $has_submenus &amp;&amp; ( $attributes[&#039;openSubmenusOnClick&#039;] || $attributes[&#039;showSubmenuIcon&#039;] ) ) || $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.
		 * @return array 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 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 );

			if ( function_exists( &#039;set_ignored_hooked_blocks_metadata&#039; ) ) {
				// Run Block Hooks algorithm to inject hooked blocks.
				$markup         = block_core_navigation_insert_hooked_blocks( $blocks, $navigation_post );
				$root_nav_block = parse_blocks( $markup )[0];

				$blocks = isset( $root_nav_block[&#039;innerBlocks&#039;] ) ? $root_nav_block[&#039;innerBlocks&#039;] : $blocks;
			}

			// 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 );
	}

	/**
	 * 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;;

		// 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 ) {
				$navigation_name = $navigation_post-&gt;post_title;

				// 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[ $navigation_name ] ) ) {
					++static::$seen_menu_names[ $navigation_name ];
				} else {
					static::$seen_menu_names[ $navigation_name ] = 1;
				}
			}
		}

		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 = isset( $attributes[&#039;styles&#039;] ) ? $attributes[&#039;styles&#039;] : &#039;&#039;;
		return $block_styles . $colors[&#039;inline_styles&#039;] . $font_sizes[&#039;inline_styles&#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;];

		$responsive_container_classes = array(
			&#039;wp-block-navigation__responsive-container&#039;,
			$is_hidden_by_default ? &#039;hidden-by-default&#039; : &#039;&#039;,
			implode( &#039; &#039;, $colors[&#039;overlay_css_classes&#039;] ),
		);
		$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;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;&#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 5v1.5h14V5H5zm0 7.8h14v-1.5H5v1.5zM5 19h14v-1.5H5V19z&quot; /&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 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;&#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-async--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-async--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-async--click=&quot;actions.closeMenuOnClick&quot;
			&#039;;
			$responsive_container_content_directives = &#039;
				data-wp-watch=&quot;callbacks.focusFirstElement&quot;
			&#039;;
		}

		$overlay_inline_styles = esc_attr( safecss_filter_attr( $colors[&#039;overlay_inline_styles&#039;] ) );

		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$s&gt;
							&lt;button %4$s class=&quot;wp-block-navigation__responsive-container-close&quot; %13$s&gt;%9$s&lt;/button&gt;
							&lt;div class=&quot;wp-block-navigation__responsive-container-content&quot; %14$s id=&quot;%1$s-content&quot;&gt;
								%2$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( implode( &#039; &#039;, $responsive_container_classes ) ),
			esc_attr( implode( &#039; &#039;, $open_button_classes ) ),
			( ! empty( $overlay_inline_styles ) ) ? &quot;style=\&quot;$overlay_inline_styles\&quot;&quot; : &#039;&#039;,
			$toggle_button_content,
			$toggle_close_button_content,
			$open_button_directives,
			$responsive_container_directives,
			$responsive_dialog_directives,
			$close_button_directives,
			$responsive_container_content_directives
		);
	}

	/**
	 * 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_wrapper_attributes( $attributes, $inner_blocks ) {
		$nav_menu_name      = static::get_unique_navigation_name( $attributes );
		$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 );
		$wrapper_attributes = get_block_wrapper_attributes(
			array(
				&#039;class&#039;      =&gt; $class,
				&#039;style&#039;      =&gt; $style,
				&#039;aria-label&#039; =&gt; $nav_menu_name,
			)
		);

		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 ) ) {
			$suffix = wp_scripts_get_suffix();
			if ( defined( &#039;IS_GUTENBERG_PLUGIN&#039; ) &amp;&amp; IS_GUTENBERG_PLUGIN ) {
				$module_url = gutenberg_url( &#039;/build/interactivity/navigation.min.js&#039; );
			}

			wp_register_script_module(
				&#039;@wordpress/block-library/navigation&#039;,
				isset( $module_url ) ? $module_url : includes_url( &quot;blocks/navigation/view{$suffix}.js&quot; ),
				array( &#039;@wordpress/interactivity&#039; ),
				defined( &#039;GUTENBERG_VERSION&#039; ) ? GUTENBERG_VERSION : get_bloginfo( &#039;version&#039; )
			);
			wp_enqueue_script_module( &#039;@wordpress/block-library/navigation&#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_wrapper_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 );

		// 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_contains_core_navigation( $inner_blocks ) ) {
			return &#039;&#039;;
		}

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

		return sprintf(
			&#039;&lt;nav %1$s&gt;%2$s&lt;/nav&gt;&#039;,
			static::get_nav_wrapper_attributes( $attributes, $inner_blocks ),
			static::get_wrapper_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 );
	}
}

/**
 * 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; }&#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; );

		if ( ! isset( $block_attributes[&#039;openSubmenusOnClick&#039;] ) || false === $block_attributes[&#039;openSubmenusOnClick&#039;] ) {
			$tags-&gt;set_attribute( &#039;data-wp-on-async--mouseenter&#039;, &#039;actions.openMenuOnHover&#039; );
			$tags-&gt;set_attribute( &#039;data-wp-on-async--mouseleave&#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-async--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-async--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 );
}

/**
 * Returns true if the navigation block contains a nested navigation block.
 *
 * @since 6.2.0
 *
 * @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 ( &#039;core/navigation&#039; === $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.
 *
 * @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;

		if ( function_exists( &#039;set_ignored_hooked_blocks_metadata&#039; ) ) {
			// 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.
			$markup = block_core_navigation_insert_hooked_blocks( $fallback_blocks, $navigation_post );
			$blocks = parse_blocks( $markup );

			if ( isset( $blocks[0][&#039;innerBlocks&#039;] ) ) {
				$fallback_blocks = $blocks[0][&#039;innerBlocks&#039;];
			}
		}
	}

	/**
	 * 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(
		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&#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;
}

/**
 * Accepts the serialized markup of a block and its inner blocks, and returns serialized markup of the inner blocks.
 *
 * @since 6.5.0
 *
 * @param string $serialized_block The serialized markup of a block and its inner blocks.
 * @return string
 */
function block_core_navigation_remove_serialized_parent_block( $serialized_block ) {
	$start = strpos( $serialized_block, &#039;--&gt;&#039; ) + strlen( &#039;--&gt;&#039; );
	$end   = strrpos( $serialized_block, &#039;&lt;!--&#039; );
	return substr( $serialized_block, $start, $end - $start );
}

/**
 * Mock a parsed block for the Navigation block given its inner blocks and the `wp_navigation` post object.
 * The `wp_navigation` post&#039;s `_wp_ignored_hooked_blocks` meta is queried to add the `metadata.ignoredHookedBlocks` attribute.
 *
 * @since 6.5.0
 *
 * @param array   $inner_blocks Parsed inner blocks of a Navigation block.
 * @param WP_Post $post         `wp_navigation` post object corresponding to the block.
 *
 * @return array the normalized parsed blocks.
 */
function block_core_navigation_mock_parsed_block( $inner_blocks, $post ) {
	$attributes = array();

	if ( isset( $post-&gt;ID ) ) {
		$ignored_hooked_blocks = get_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, true );
		if ( ! empty( $ignored_hooked_blocks ) ) {
			$ignored_hooked_blocks  = json_decode( $ignored_hooked_blocks, true );
			$attributes[&#039;metadata&#039;] = array(
				&#039;ignoredHookedBlocks&#039; =&gt; $ignored_hooked_blocks,
			);
		}
	}

	$mock_anchor_parent_block = array(
		&#039;blockName&#039;    =&gt; &#039;core/navigation&#039;,
		&#039;attrs&#039;        =&gt; $attributes,
		&#039;innerBlocks&#039;  =&gt; $inner_blocks,
		&#039;innerContent&#039; =&gt; array_fill( 0, count( $inner_blocks ), null ),
	);

	return $mock_anchor_parent_block;
}

/**
 * Insert hooked blocks into a Navigation block.
 *
 * Given a Navigation block&#039;s inner blocks and its corresponding `wp_navigation` post object,
 * this function inserts hooked blocks into it, and returns the serialized inner blocks in a
 * mock Navigation block wrapper.
 *
 * If there are any hooked blocks that need to be inserted as the Navigation block&#039;s first or last
 * children, the `wp_navigation` post&#039;s `_wp_ignored_hooked_blocks` meta is checked to see if any
 * of those hooked blocks should be exempted from insertion.
 *
 * @since 6.5.0
 *
 * @param array   $inner_blocks Parsed inner blocks of a Navigation block.
 * @param WP_Post $post         `wp_navigation` post object corresponding to the block.
 * @return string Serialized inner blocks in mock Navigation block wrapper, with hooked blocks inserted, if any.
 */
function block_core_navigation_insert_hooked_blocks( $inner_blocks, $post ) {
	$mock_navigation_block = block_core_navigation_mock_parsed_block( $inner_blocks, $post );
	$hooked_blocks         = get_hooked_blocks();
	$before_block_visitor  = null;
	$after_block_visitor   = null;

	if ( ! empty( $hooked_blocks ) || has_filter( &#039;hooked_block_types&#039; ) ) {
		$before_block_visitor = make_before_block_visitor( $hooked_blocks, $post, &#039;insert_hooked_blocks&#039; );
		$after_block_visitor  = make_after_block_visitor( $hooked_blocks, $post, &#039;insert_hooked_blocks&#039; );
	}

	return traverse_and_serialize_block( $mock_navigation_block, $before_block_visitor, $after_block_visitor );
}

/**
 * Insert ignoredHookedBlocks meta into the Navigation block and its inner blocks.
 *
 * Given a Navigation block&#039;s inner blocks and its corresponding `wp_navigation` post object,
 * this function inserts ignoredHookedBlocks meta into it, and returns the serialized inner blocks in a
 * mock Navigation block wrapper.
 *
 * @since 6.5.0
 *
 * @param array   $inner_blocks Parsed inner blocks of a Navigation block.
 * @param WP_Post $post         `wp_navigation` post object corresponding to the block.
 * @return string Serialized inner blocks in mock Navigation block wrapper, with hooked blocks inserted, if any.
 */
function block_core_navigation_set_ignored_hooked_blocks_metadata( $inner_blocks, $post ) {
	$mock_navigation_block = block_core_navigation_mock_parsed_block( $inner_blocks, $post );
	$hooked_blocks         = get_hooked_blocks();
	$before_block_visitor  = null;
	$after_block_visitor   = null;

	if ( ! empty( $hooked_blocks ) || has_filter( &#039;hooked_block_types&#039; ) ) {
		$before_block_visitor = make_before_block_visitor( $hooked_blocks, $post, &#039;set_ignored_hooked_blocks_metadata&#039; );
		$after_block_visitor  = make_after_block_visitor( $hooked_blocks, $post, &#039;set_ignored_hooked_blocks_metadata&#039; );
	}

	return traverse_and_serialize_block( $mock_navigation_block, $before_block_visitor, $after_block_visitor );
}

/**
 * Updates the post meta with the list of ignored hooked blocks when the navigation is created or updated via the REST API.
 *
 * @access private
 * @since 6.5.0
 *
 * @param stdClass $post Post object.
 * @return stdClass The updated post object.
 */
function block_core_navigation_update_ignore_hooked_blocks_meta( $post ) {
	/*
	 * In this scenario the user has likely tried to create a navigation via the REST API.
	 * In which case we won&#039;t have a post ID to work with and store meta against.
	 */
	if ( empty( $post-&gt;ID ) ) {
		return $post;
	}

	/**
	 * Skip meta generation when consumers intentionally update specific Navigation fields
	 * and omit the content update.
	 */
	if ( ! isset( $post-&gt;post_content ) ) {
		return $post;
	}

	/*
	 * We run the Block Hooks mechanism to inject the `metadata.ignoredHookedBlocks` attribute into
	 * all anchor blocks. For the root level, we create a mock Navigation and extract them from there.
	 */
	$blocks = parse_blocks( $post-&gt;post_content );

	/*
	 * Block Hooks logic requires a `WP_Post` object (rather than the `stdClass` with the updates that
	 * we&#039;re getting from the `rest_pre_insert_wp_navigation` filter) as its second argument (to be
	 * used as context for hooked blocks insertion).
	 * We thus have to look it up from the DB,based on `$post-&gt;ID`.
	 */
	$markup = block_core_navigation_set_ignored_hooked_blocks_metadata( $blocks, get_post( $post-&gt;ID ) );

	$root_nav_block        = parse_blocks( $markup )[0];
	$ignored_hooked_blocks = isset( $root_nav_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;] )
		? $root_nav_block[&#039;attrs&#039;][&#039;metadata&#039;][&#039;ignoredHookedBlocks&#039;]
		: array();

	if ( ! empty( $ignored_hooked_blocks ) ) {
		$existing_ignored_hooked_blocks = get_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, true );
		if ( ! empty( $existing_ignored_hooked_blocks ) ) {
			$existing_ignored_hooked_blocks = json_decode( $existing_ignored_hooked_blocks, true );
			$ignored_hooked_blocks          = array_unique( array_merge( $ignored_hooked_blocks, $existing_ignored_hooked_blocks ) );
		}
		update_post_meta( $post-&gt;ID, &#039;_wp_ignored_hooked_blocks&#039;, json_encode( $ignored_hooked_blocks ) );
	}

	$post-&gt;post_content = block_core_navigation_remove_serialized_parent_block( $markup );
	return $post;
}

/*
 * Before adding our filter, we verify if it&#039;s already added in Core.
 * However, during the build process, Gutenberg automatically prefixes our functions with &quot;gutenberg_&quot;.
 * Therefore, we concatenate the Core&#039;s function name to circumvent this prefix for our check.
 */
$rest_insert_wp_navigation_core_callback = &#039;block_core_navigation_&#039; . &#039;update_ignore_hooked_blocks_meta&#039;; // phpcs:ignore Generic.Strings.UnnecessaryStringConcat.Found

/*
 * Do not add the `block_core_navigation_update_ignore_hooked_blocks_meta` filter in the following cases:
 * - If Core has added the `update_ignored_hooked_blocks_postmeta` filter already (WP &gt;= 6.6);
 * - or if the `set_ignored_hooked_blocks_metadata` function is unavailable (which is required for the filter to work. It was introduced by WP 6.5 but is not present in Gutenberg&#039;s WP 6.5 compatibility layer);
 * - or if the `$rest_insert_wp_navigation_core_callback` filter has already been added.
 */
if (
	! has_filter( &#039;rest_pre_insert_wp_navigation&#039;, &#039;update_ignored_hooked_blocks_postmeta&#039; ) &amp;&amp;
	function_exists( &#039;set_ignored_hooked_blocks_metadata&#039; ) &amp;&amp;
	! has_filter( &#039;rest_pre_insert_wp_navigation&#039;, $rest_insert_wp_navigation_core_callback )
) {
	add_filter( &#039;rest_pre_insert_wp_navigation&#039;, &#039;block_core_navigation_update_ignore_hooked_blocks_meta&#039; );
}

/*
 * Previous versions of Gutenberg were attaching the block_core_navigation_update_ignore_hooked_blocks_meta
 * function to the `rest_insert_wp_navigation` _action_ (rather than the `rest_pre_insert_wp_navigation` _filter_).
 * To avoid collisions, we need to remove the filter from that action if it&#039;s present.
 */
if ( has_filter( &#039;rest_insert_wp_navigation&#039;, $rest_insert_wp_navigation_core_callback ) ) {
	remove_filter( &#039;rest_insert_wp_navigation&#039;, $rest_insert_wp_navigation_core_callback );
}

/**
 * Hooks into the REST API response for the core/navigation block and adds the first and last inner blocks.
 *
 * @since 6.5.0
 *
 * @param WP_REST_Response $response The response object.
 * @param WP_Post          $post     Post object.
 * @return WP_REST_Response The response object.
 */
function block_core_navigation_insert_hooked_blocks_into_rest_response( $response, $post ) {
	if ( ! isset( $response-&gt;data[&#039;content&#039;][&#039;raw&#039;] ) || ! isset( $response-&gt;data[&#039;content&#039;][&#039;rendered&#039;] ) ) {
		return $response;
	}
	$parsed_blocks = parse_blocks( $response-&gt;data[&#039;content&#039;][&#039;raw&#039;] );
	$content       = block_core_navigation_insert_hooked_blocks( $parsed_blocks, $post );

	// Remove mock Navigation block wrapper.
	$content = block_core_navigation_remove_serialized_parent_block( $content );

	$response-&gt;data[&#039;content&#039;][&#039;raw&#039;] = $content;

	/** This filter is documented in wp-includes/post-template.php */
	$response-&gt;data[&#039;content&#039;][&#039;rendered&#039;] = apply_filters( &#039;the_content&#039;, $content );

	return $response;
}

/*
 *  Before adding our filter, we verify if it&#039;s already added in Core.
 * However, during the build process, Gutenberg automatically prefixes our functions with &quot;gutenberg_&quot;.
 * Therefore, we concatenate the Core&#039;s function name to circumvent this prefix for our check.
 */
$rest_prepare_wp_navigation_core_callback = &#039;block_core_navigation_&#039; . &#039;insert_hooked_blocks_into_rest_response&#039;;

/*
 * Do not add the `block_core_navigation_insert_hooked_blocks_into_rest_response` filter in the following cases:
 * - If Core has added the `insert_hooked_blocks_into_rest_response` filter already (WP &gt;= 6.6);
 * - or if the `set_ignored_hooked_blocks_metadata` function is unavailable (which is required for the filter to work. It was introduced by WP 6.5 but is not present in Gutenberg&#039;s WP 6.5 compatibility layer);
 * - or if the `$rest_prepare_wp_navigation_core_callback` filter has already been added.
 */
if (
	! has_filter( &#039;rest_prepare_wp_navigation&#039;, &#039;insert_hooked_blocks_into_rest_response&#039; ) &amp;&amp;
	function_exists( &#039;set_ignored_hooked_blocks_metadata&#039; ) &amp;&amp;
	! has_filter( &#039;rest_prepare_wp_navigation&#039;, $rest_prepare_wp_navigation_core_callback )
) {
	add_filter( &#039;rest_prepare_wp_navigation&#039;, &#039;block_core_navigation_insert_hooked_blocks_into_rest_response&#039;, 10, 3 );
}
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