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

/**
 * Build an array with CSS classes and inline styles defining the colors
 * which will be applied to the navigation markup in the front-end.
 *
 * @param  array $context     Navigation block context.
 * @param  array $attributes  Block attributes.
 * @param  bool  $is_sub_menu Whether the link is part of a sub-menu.
 * @return array Colors CSS classes and inline styles.
 */
function block_core_navigation_link_build_css_colors( $context, $attributes, $is_sub_menu = false ) {
	$colors = array(
		'css_classes'   =&gt; array(),
		'inline_styles' =&gt; '',
	);

	// Text color.
	$named_text_color  = null;
	$custom_text_color = null;

	if ( $is_sub_menu &amp;&amp; array_key_exists( 'customOverlayTextColor', $context ) ) {
		$custom_text_color = $context['customOverlayTextColor'];
	} elseif ( $is_sub_menu &amp;&amp; array_key_exists( 'overlayTextColor', $context ) ) {
		$named_text_color = $context['overlayTextColor'];
	} elseif ( array_key_exists( 'customTextColor', $context ) ) {
		$custom_text_color = $context['customTextColor'];
	} elseif ( array_key_exists( 'textColor', $context ) ) {
		$named_text_color = $context['textColor'];
	} elseif ( isset( $context['style']['color']['text'] ) ) {
		$custom_text_color = $context['style']['color']['text'];
	}

	// If has text color.
	if ( ! is_null( $named_text_color ) ) {
		// Add the color class.
		array_push( $colors['css_classes'], 'has-text-color', sprintf( 'has-%s-color', $named_text_color ) );
	} elseif ( ! is_null( $custom_text_color ) ) {
		// Add the custom color inline style.
		$colors['css_classes'][]  = 'has-text-color';
		$colors['inline_styles'] .= sprintf( 'color: %s;', $custom_text_color );
	}

	// Background color.
	$named_background_color  = null;
	$custom_background_color = null;

	if ( $is_sub_menu &amp;&amp; array_key_exists( 'customOverlayBackgroundColor', $context ) ) {
		$custom_background_color = $context['customOverlayBackgroundColor'];
	} elseif ( $is_sub_menu &amp;&amp; array_key_exists( 'overlayBackgroundColor', $context ) ) {
		$named_background_color = $context['overlayBackgroundColor'];
	} elseif ( array_key_exists( 'customBackgroundColor', $context ) ) {
		$custom_background_color = $context['customBackgroundColor'];
	} elseif ( array_key_exists( 'backgroundColor', $context ) ) {
		$named_background_color = $context['backgroundColor'];
	} elseif ( isset( $context['style']['color']['background'] ) ) {
		$custom_background_color = $context['style']['color']['background'];
	}

	// If has background color.
	if ( ! is_null( $named_background_color ) ) {
		// Add the background-color class.
		array_push( $colors['css_classes'], 'has-background', sprintf( 'has-%s-background-color', $named_background_color ) );
	} elseif ( ! is_null( $custom_background_color ) ) {
		// Add the custom background-color inline style.
		$colors['css_classes'][]  = 'has-background';
		$colors['inline_styles'] .= sprintf( 'background-color: %s;', $custom_background_color );
	}

	return $colors;
}

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

	$has_named_font_size  = array_key_exists( 'fontSize', $context );
	$has_custom_font_size = isset( $context['style']['typography']['fontSize'] );

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

	return $font_sizes;
}

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

/**
 * Decodes a url if it's encoded, returning the same url if not.
 *
 * @param string $url The url to decode.
 *
 * @return string $url Returns the decoded url.
 */
function block_core_navigation_link_maybe_urldecode( $url ) {
	$is_url_encoded = false;
	$query          = parse_url( $url, PHP_URL_QUERY );
	$query_params   = wp_parse_args( $query );

	foreach ( $query_params as $query_param ) {
		if ( rawurldecode( $query_param ) !== $query_param ) {
			$is_url_encoded = true;
			break;
		}
	}

	if ( $is_url_encoded ) {
		return rawurldecode( $url );
	}

	return $url;
}


/**
 * Renders the `core/navigation-link` block.
 *
 * @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_link( $attributes, $content, $block ) {
	$navigation_link_has_id = isset( $attributes['id'] ) &amp;&amp; is_numeric( $attributes['id'] );
	$is_post_type           = isset( $attributes['kind'] ) &amp;&amp; 'post-type' === $attributes['kind'];
	$is_post_type           = $is_post_type || isset( $attributes['type'] ) &amp;&amp; ( 'post' === $attributes['type'] || 'page' === $attributes['type'] );

	// Don't render the block's subtree if it is a draft or if the ID does not exist.
	if ( $is_post_type &amp;&amp; $navigation_link_has_id ) {
		$post = get_post( $attributes['id'] );
		if ( ! $post || 'publish' !== $post-&gt;post_status ) {
			return '';
		}
	}

	// Don't render the block's subtree if it has no label.
	if ( empty( $attributes['label'] ) ) {
		return '';
	}

	$font_sizes      = block_core_navigation_link_build_css_font_sizes( $block-&gt;context );
	$classes         = array_merge(
		$font_sizes['css_classes']
	);
	$style_attribute = $font_sizes['inline_styles'];

	$css_classes = trim( implode( ' ', $classes ) );
	$has_submenu = count( $block-&gt;inner_blocks ) &gt; 0;
	$is_active   = ! empty( $attributes['id'] ) &amp;&amp; ( get_queried_object_id() === (int) $attributes['id'] );

	$wrapper_attributes = get_block_wrapper_attributes(
		array(
			'class' =&gt; $css_classes . ' wp-block-navigation-item' . ( $has_submenu ? ' has-child' : '' ) .
				( $is_active ? ' current-menu-item' : '' ),
			'style' =&gt; $style_attribute,
		)
	);
	$html               = '&lt;li ' . $wrapper_attributes . '&gt;' .
		'&lt;a class=&quot;wp-block-navigation-item__content&quot; ';

	// Start appending HTML attributes to anchor tag.
	if ( isset( $attributes['url'] ) ) {
		$html .= ' href=&quot;' . esc_url( block_core_navigation_link_maybe_urldecode( $attributes['url'] ) ) . '&quot;';
	}

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

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

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

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

	// End appending HTML attributes to anchor tag.

	// Start anchor tag content.
	$html .= '&gt;' .
		// Wrap title with span to isolate it from submenu icon.
		'&lt;span class=&quot;wp-block-navigation-item__label&quot;&gt;';

	if ( isset( $attributes['label'] ) ) {
		$html .= wp_kses_post( $attributes['label'] );
	}

	$html .= '&lt;/span&gt;';

	// Add description if available.
	if ( ! empty( $attributes['description'] ) ) {
		$html .= '&lt;span class=&quot;wp-block-navigation-item__description&quot;&gt;';
		$html .= wp_kses_post( $attributes['description'] );
		$html .= '&lt;/span&gt;';
	}

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

	if ( isset( $block-&gt;context['showSubmenuIcon'] ) &amp;&amp; $block-&gt;context['showSubmenuIcon'] &amp;&amp; $has_submenu ) {
		// The submenu icon can be hidden by a CSS rule on the Navigation Block.
		$html .= '&lt;span class=&quot;wp-block-navigation__submenu-icon&quot;&gt;' . block_core_navigation_link_render_submenu_icon() . '&lt;/span&gt;';
	}

	if ( $has_submenu ) {
		$inner_blocks_html = '';
		foreach ( $block-&gt;inner_blocks as $inner_block ) {
			$inner_blocks_html .= $inner_block-&gt;render();
		}

		$html .= sprintf(
			'&lt;ul class=&quot;wp-block-navigation__submenu-container&quot;&gt;%s&lt;/ul&gt;',
			$inner_blocks_html
		);
	}

	$html .= '&lt;/li&gt;';

	return $html;
}

/**
 * Returns a navigation link variation
 *
 * @param WP_Taxonomy|WP_Post_Type $entity post type or taxonomy entity.
 * @param string                   $kind string of value 'taxonomy' or 'post-type'.
 *
 * @return array
 */
function build_variation_for_navigation_link( $entity, $kind ) {
	$title       = '';
	$description = '';

	if ( property_exists( $entity-&gt;labels, 'item_link' ) ) {
		$title = $entity-&gt;labels-&gt;item_link;
	}
	if ( property_exists( $entity-&gt;labels, 'item_link_description' ) ) {
		$description = $entity-&gt;labels-&gt;item_link_description;
	}

	$variation = array(
		'name'        =&gt; $entity-&gt;name,
		'title'       =&gt; $title,
		'description' =&gt; $description,
		'attributes'  =&gt; array(
			'type' =&gt; $entity-&gt;name,
			'kind' =&gt; $kind,
		),
	);

	// Tweak some value for the variations.
	$variation_overrides = array(
		'post_tag'    =&gt; array(
			'name'       =&gt; 'tag',
			'attributes' =&gt; array(
				'type' =&gt; 'tag',
				'kind' =&gt; $kind,
			),
		),
		'post_format' =&gt; array(
			// The item_link and item_link_description for post formats is the
			// same as for tags, so need to be overridden.
			'title'       =&gt; __( 'Post Format Link' ),
			'description' =&gt; __( 'A link to a post format' ),
			'attributes'  =&gt; array(
				'type' =&gt; 'post_format',
				'kind' =&gt; $kind,
			),
		),
	);

	if ( array_key_exists( $entity-&gt;name, $variation_overrides ) ) {
		$variation = array_merge(
			$variation,
			$variation_overrides[ $entity-&gt;name ]
		);
	}

	return $variation;
}

/**
 * Register the navigation link block.
 *
 * @uses render_block_core_navigation()
 * @throws WP_Error An WP_Error exception parsing the block definition.
 */
function register_block_core_navigation_link() {
	$post_types = get_post_types( array( 'show_in_nav_menus' =&gt; true ), 'objects' );
	$taxonomies = get_taxonomies( array( 'show_in_nav_menus' =&gt; true ), 'objects' );

	// Use two separate arrays as a way to order the variations in the UI.
	// Known variations (like Post Link and Page Link) are added to the
	// `built_ins` array. Variations for custom post types and taxonomies are
	// added to the `variations` array and will always appear after `built-ins.
	$built_ins  = array();
	$variations = array();

	if ( $post_types ) {
		foreach ( $post_types as $post_type ) {
			$variation = build_variation_for_navigation_link( $post_type, 'post-type' );
			if ( $post_type-&gt;_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}
	if ( $taxonomies ) {
		foreach ( $taxonomies as $taxonomy ) {
			$variation = build_variation_for_navigation_link( $taxonomy, 'taxonomy' );
			if ( $taxonomy-&gt;_builtin ) {
				$built_ins[] = $variation;
			} else {
				$variations[] = $variation;
			}
		}
	}

	register_block_type_from_metadata(
		__DIR__ . '/navigation-link',
		array(
			'render_callback' =&gt; 'render_block_core_navigation_link',
			'variations'      =&gt; array_merge( $built_ins, $variations ),
		)
	);
}
add_action( 'init', 'register_block_core_navigation_link' );
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