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

/**
 * 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 $context Navigation block context.
 * @return array Font size CSS classes and inline styles.
 */
function block_core_navigation_submenu_build_css_font_sizes( $context ) {
	// 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;, $context );
	$has_custom_font_size = isset( $context[&#039;style&#039;][&#039;typography&#039;][&#039;fontSize&#039;] );

	if ( $has_named_font_size ) {
		// Add the font size class.
		$font_sizes[&#039;css_classes&#039;][] = sprintf( &#039;has-%s-font-size&#039;, $context[&#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: %s;&#039;,
			wp_get_typography_font_size_value(
				array(
					&#039;size&#039; =&gt; $context[&#039;style&#039;][&#039;typography&#039;][&#039;fontSize&#039;],
				)
			)
		);
	}

	return $font_sizes;
}

/**
 * Returns the top-level submenu SVG chevron icon.
 *
 * @since 5.9.0
 *
 * @return string
 */
function block_core_navigation_submenu_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;;
}

/**
 * Renders the `core/navigation-submenu` block.
 *
 * @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 post content with the legacy widget added.
 */
function render_block_core_navigation_submenu( $attributes, $content, $block ) {
	$navigation_link_has_id = isset( $attributes[&#039;id&#039;] ) &amp;&amp; is_numeric( $attributes[&#039;id&#039;] );
	$is_post_type           = isset( $attributes[&#039;kind&#039;] ) &amp;&amp; &#039;post-type&#039; === $attributes[&#039;kind&#039;];
	$is_post_type           = $is_post_type || isset( $attributes[&#039;type&#039;] ) &amp;&amp; ( &#039;post&#039; === $attributes[&#039;type&#039;] || &#039;page&#039; === $attributes[&#039;type&#039;] );

	// Don&#039;t render the block&#039;s subtree if it is a draft.
	if ( $is_post_type &amp;&amp; $navigation_link_has_id &amp;&amp; &#039;publish&#039; !== get_post_status( $attributes[&#039;id&#039;] ) ) {
		return &#039;&#039;;
	}

	// Don&#039;t render the block&#039;s subtree if it has no label.
	if ( empty( $attributes[&#039;label&#039;] ) ) {
		return &#039;&#039;;
	}

	$font_sizes      = block_core_navigation_submenu_build_css_font_sizes( $block-&gt;context );
	$style_attribute = $font_sizes[&#039;inline_styles&#039;];

	$css_classes = trim( implode( &#039; &#039;, $font_sizes[&#039;css_classes&#039;] ) );
	$has_submenu = count( $block-&gt;inner_blocks ) &gt; 0;
	$kind        = empty( $attributes[&#039;kind&#039;] ) ? &#039;post_type&#039; : str_replace( &#039;-&#039;, &#039;_&#039;, $attributes[&#039;kind&#039;] );
	$is_active   = ! empty( $attributes[&#039;id&#039;] ) &amp;&amp; get_queried_object_id() === (int) $attributes[&#039;id&#039;] &amp;&amp; ! empty( get_queried_object()-&gt;$kind );

	if ( is_post_type_archive() ) {
		$queried_archive_link = get_post_type_archive_link( get_queried_object()-&gt;name );
		if ( $attributes[&#039;url&#039;] === $queried_archive_link ) {
			$is_active = true;
		}
	}

	$show_submenu_indicators = isset( $block-&gt;context[&#039;showSubmenuIcon&#039;] ) &amp;&amp; $block-&gt;context[&#039;showSubmenuIcon&#039;];
	$open_on_click           = isset( $block-&gt;context[&#039;openSubmenusOnClick&#039;] ) &amp;&amp; $block-&gt;context[&#039;openSubmenusOnClick&#039;];
	$open_on_hover_and_click = isset( $block-&gt;context[&#039;openSubmenusOnClick&#039;] ) &amp;&amp; ! $block-&gt;context[&#039;openSubmenusOnClick&#039;] &amp;&amp;
		$show_submenu_indicators;

	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			&#039;class&#039; =&gt; $css_classes . &#039; wp-block-navigation-item&#039; . ( $has_submenu ? &#039; has-child&#039; : &#039;&#039; ) .
			( $open_on_click ? &#039; open-on-click&#039; : &#039;&#039; ) . ( $open_on_hover_and_click ? &#039; open-on-hover-click&#039; : &#039;&#039; ) .
			( $is_active ? &#039; current-menu-item&#039; : &#039;&#039; ),
			&#039;style&#039; =&gt; $style_attribute,
		)
	);

	$label = &#039;&#039;;

	if ( isset( $attributes[&#039;label&#039;] ) ) {
		$label .= wp_kses_post( $attributes[&#039;label&#039;] );
	}

	$aria_label = sprintf(
		/* translators: Accessibility text. %s: Parent page title. */
		__( &#039;%s submenu&#039; ),
		wp_strip_all_tags( $label )
	);

	$html = &#039;&lt;li &#039; . $wrapper_attributes . &#039;&gt;&#039;;

	// If Submenus open on hover, we render an anchor tag with attributes.
	// If submenu icons are set to show, we also render a submenu button, so the submenu can be opened on click.
	if ( ! $open_on_click ) {
		$item_url = isset( $attributes[&#039;url&#039;] ) ? $attributes[&#039;url&#039;] : &#039;&#039;;
		// Start appending HTML attributes to anchor tag.
		$html .= &#039;&lt;a class=&quot;wp-block-navigation-item__content&quot;&#039;;

		// The href attribute on a and area elements is not required;
		// when those elements do not have href attributes they do not create hyperlinks.
		// But also The href attribute must have a value that is a valid URL potentially
		// surrounded by spaces.
		// see: https://html.spec.whatwg.org/multipage/links.html#links-created-by-a-and-area-elements.
		if ( ! empty( $item_url ) ) {
			$html .= &#039; href=&quot;&#039; . esc_url( $item_url ) . &#039;&quot;&#039;;
		}

		if ( $is_active ) {
			$html .= &#039; aria-current=&quot;page&quot;&#039;;
		}

		if ( isset( $attributes[&#039;opensInNewTab&#039;] ) &amp;&amp; true === $attributes[&#039;opensInNewTab&#039;] ) {
			$html .= &#039; target=&quot;_blank&quot;  &#039;;
		}

		if ( isset( $attributes[&#039;rel&#039;] ) ) {
			$html .= &#039; rel=&quot;&#039; . esc_attr( $attributes[&#039;rel&#039;] ) . &#039;&quot;&#039;;
		} elseif ( isset( $attributes[&#039;nofollow&#039;] ) &amp;&amp; $attributes[&#039;nofollow&#039;] ) {
			$html .= &#039; rel=&quot;nofollow&quot;&#039;;
		}

		if ( isset( $attributes[&#039;title&#039;] ) ) {
			$html .= &#039; title=&quot;&#039; . esc_attr( $attributes[&#039;title&#039;] ) . &#039;&quot;&#039;;
		}

		$html .= &#039;&gt;&#039;;
		// End appending HTML attributes to anchor tag.

		$html .= $label;

		$html .= &#039;&lt;/a&gt;&#039;;
		// End anchor tag content.

		if ( $show_submenu_indicators ) {
			// The submenu icon is rendered in a button here
			// so that there&#039;s a clickable element to open the submenu.
			$html .= &#039;&lt;button aria-label=&quot;&#039; . esc_attr( $aria_label ) . &#039;&quot; class=&quot;wp-block-navigation__submenu-icon wp-block-navigation-submenu__toggle&quot; aria-expanded=&quot;false&quot;&gt;&#039; . block_core_navigation_submenu_render_submenu_icon() . &#039;&lt;/button&gt;&#039;;
		}
	} else {
		// If menus open on click, we render the parent as a button.
		$html .= &#039;&lt;button aria-label=&quot;&#039; . esc_attr( $aria_label ) . &#039;&quot; class=&quot;wp-block-navigation-item__content wp-block-navigation-submenu__toggle&quot; aria-expanded=&quot;false&quot;&gt;&#039;;

		// Wrap title with span to isolate it from submenu icon.
		$html .= &#039;&lt;span class=&quot;wp-block-navigation-item__label&quot;&gt;&#039;;

		$html .= $label;

		$html .= &#039;&lt;/span&gt;&#039;;

		$html .= &#039;&lt;/button&gt;&#039;;

		$html .= &#039;&lt;span class=&quot;wp-block-navigation__submenu-icon&quot;&gt;&#039; . block_core_navigation_submenu_render_submenu_icon() . &#039;&lt;/span&gt;&#039;;

	}

	if ( $has_submenu ) {
		// Copy some attributes from the parent block to this one.
		// Ideally this would happen in the client when the block is created.
		if ( array_key_exists( &#039;overlayTextColor&#039;, $block-&gt;context ) ) {
			$attributes[&#039;textColor&#039;] = $block-&gt;context[&#039;overlayTextColor&#039;];
		}
		if ( array_key_exists( &#039;overlayBackgroundColor&#039;, $block-&gt;context ) ) {
			$attributes[&#039;backgroundColor&#039;] = $block-&gt;context[&#039;overlayBackgroundColor&#039;];
		}
		if ( array_key_exists( &#039;customOverlayTextColor&#039;, $block-&gt;context ) ) {
			$attributes[&#039;style&#039;][&#039;color&#039;][&#039;text&#039;] = $block-&gt;context[&#039;customOverlayTextColor&#039;];
		}
		if ( array_key_exists( &#039;customOverlayBackgroundColor&#039;, $block-&gt;context ) ) {
			$attributes[&#039;style&#039;][&#039;color&#039;][&#039;background&#039;] = $block-&gt;context[&#039;customOverlayBackgroundColor&#039;];
		}

		// This allows us to be able to get a response from wp_apply_colors_support.
		$block-&gt;block_type-&gt;supports[&#039;color&#039;] = true;
		$colors_supports                      = wp_apply_colors_support( $block-&gt;block_type, $attributes );
		$css_classes                          = &#039;wp-block-navigation__submenu-container&#039;;
		if ( array_key_exists( &#039;class&#039;, $colors_supports ) ) {
			$css_classes .= &#039; &#039; . $colors_supports[&#039;class&#039;];
		}

		$style_attribute = &#039;&#039;;
		if ( array_key_exists( &#039;style&#039;, $colors_supports ) ) {
			$style_attribute = $colors_supports[&#039;style&#039;];
		}

		$inner_blocks_html = &#039;&#039;;
		foreach ( $block-&gt;inner_blocks as $inner_block ) {
			$inner_blocks_html .= $inner_block-&gt;render();
		}

		if ( strpos( $inner_blocks_html, &#039;current-menu-item&#039; ) ) {
			$tag_processor = new WP_HTML_Tag_Processor( $html );
			while ( $tag_processor-&gt;next_tag( array( &#039;class_name&#039; =&gt; &#039;wp-block-navigation-item__content&#039; ) ) ) {
				$tag_processor-&gt;add_class( &#039;current-menu-ancestor&#039; );
			}
			$html = $tag_processor-&gt;get_updated_html();
		}

		$wrapper_attributes = get_block_wrapper_attributes(
			array(
				&#039;class&#039; =&gt; $css_classes,
				&#039;style&#039; =&gt; $style_attribute,
			)
		);

		$html .= sprintf(
			&#039;&lt;ul %s&gt;%s&lt;/ul&gt;&#039;,
			$wrapper_attributes,
			$inner_blocks_html
		);

	}

	$html .= &#039;&lt;/li&gt;&#039;;

	return $html;
}

/**
 * Register the navigation submenu block.
 *
 * @since 5.9.0
 *
 * @uses render_block_core_navigation_submenu()
 * @throws WP_Error An WP_Error exception parsing the block definition.
 */
function register_block_core_navigation_submenu() {
	register_block_type_from_metadata(
		__DIR__ . &#039;/navigation-submenu&#039;,
		array(
			&#039;render_callback&#039; =&gt; &#039;render_block_core_navigation_submenu&#039;,
		)
	);
}
add_action( &#039;init&#039;, &#039;register_block_core_navigation_submenu&#039; );
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