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

/**
 * Renders the `core/template-part` block on the server.
 *
 * @since 5.9.0
 *
 * @global WP_Embed $wp_embed WordPress Embed object.
 *
 * @param array $attributes The block attributes.
 *
 * @return string The render.
 */
function render_block_core_template_part( $attributes ) {
	static $seen_ids = array();

	$template_part_id = null;
	$content          = null;
	$area             = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
	$theme            = $attributes[&#039;theme&#039;] ?? get_stylesheet();

	if ( isset( $attributes[&#039;slug&#039;] ) &amp;&amp; get_stylesheet() === $theme ) {
		$template_part_id    = $theme . &#039;//&#039; . $attributes[&#039;slug&#039;];
		$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( $attributes[&#039;slug&#039;] ),
				&#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 ) {
			// A published post might already exist if this template part was customized elsewhere
			// or if it&#039;s part of a customized template.
			$block_template = _build_block_template_result_from_post( $template_part_post );
			$content        = $block_template-&gt;content;
			if ( isset( $block_template-&gt;area ) ) {
				$area = $block_template-&gt;area;
			}
			/**
			 * Fires when a block template part is loaded from a template post stored in the database.
			 *
			 * @since 5.9.0
			 *
			 * @param string  $template_part_id   The requested template part namespaced to the theme.
			 * @param array   $attributes         The block attributes.
			 * @param WP_Post $template_part_post The template part post object.
			 * @param string  $content            The template part content.
			 */
			do_action( &#039;render_block_core_template_part_post&#039;, $template_part_id, $attributes, $template_part_post, $content );
		} else {
			$template_part_file_path = &#039;&#039;;
			// Else, if the template part was provided by the active theme,
			// render the corresponding file content.
			if ( 0 === validate_file( $attributes[&#039;slug&#039;] ) ) {
				$block_template = get_block_file_template( $template_part_id, &#039;wp_template_part&#039; );

				if ( isset( $block_template-&gt;content ) ) {
					$content = $block_template-&gt;content;
				}
				if ( isset( $block_template-&gt;area ) ) {
					$area = $block_template-&gt;area;
				}

				// Needed for the `render_block_core_template_part_file` and `render_block_core_template_part_none` actions below.
				$block_template_file = _get_block_template_file( &#039;wp_template_part&#039;, $attributes[&#039;slug&#039;] );
				if ( $block_template_file ) {
					$template_part_file_path = $block_template_file[&#039;path&#039;];
				}
			}

			if ( &#039;&#039; !== $content &amp;&amp; null !== $content ) {
				/**
				 * Fires when a block template part is loaded from a template part in the theme.
				 *
				 * @since 5.9.0
				 *
				 * @param string $template_part_id        The requested template part namespaced to the theme.
				 * @param array  $attributes              The block attributes.
				 * @param string $template_part_file_path Absolute path to the template path.
				 * @param string $content                 The template part content.
				 */
				do_action( &#039;render_block_core_template_part_file&#039;, $template_part_id, $attributes, $template_part_file_path, $content );
			} else {
				/**
				 * Fires when a requested block template part does not exist in the database nor in the theme.
				 *
				 * @since 5.9.0
				 *
				 * @param string $template_part_id        The requested template part namespaced to the theme.
				 * @param array  $attributes              The block attributes.
				 * @param string $template_part_file_path Absolute path to the not found template path.
				 */
				do_action( &#039;render_block_core_template_part_none&#039;, $template_part_id, $attributes, $template_part_file_path );
			}
		}
	}

	// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
	// is set in `wp_debug_mode()`.
	$is_debug = WP_DEBUG &amp;&amp; WP_DEBUG_DISPLAY;

	if ( is_null( $content ) ) {
		if ( $is_debug &amp;&amp; isset( $attributes[&#039;slug&#039;] ) ) {
			return sprintf(
				/* translators: %s: Template part slug. */
				__( &#039;Template part has been deleted or is unavailable: %s&#039; ),
				$attributes[&#039;slug&#039;]
			);
		}

		return &#039;&#039;;
	}

	if ( isset( $seen_ids[ $template_part_id ] ) ) {
		return $is_debug ?
			// translators: Visible only in the front end, this warning takes the place of a faulty block.
			__( &#039;[block rendering halted]&#039; ) :
			&#039;&#039;;
	}

	// Look up area definition.
	$area_definition = null;
	$defined_areas   = get_allowed_block_template_part_areas();
	foreach ( $defined_areas as $defined_area ) {
		if ( $defined_area[&#039;area&#039;] === $area ) {
			$area_definition = $defined_area;
			break;
		}
	}

	// If $area is not allowed, set it back to the uncategorized default.
	if ( ! $area_definition ) {
		$area = WP_TEMPLATE_PART_AREA_UNCATEGORIZED;
	}

	// Run through the actions that are typically taken on the_content.
	$content                       = shortcode_unautop( $content );
	$content                       = do_shortcode( $content );
	$seen_ids[ $template_part_id ] = true;
	$content                       = do_blocks( $content );
	unset( $seen_ids[ $template_part_id ] );
	$content = wptexturize( $content );
	$content = convert_smilies( $content );
	$content = wp_filter_content_tags( $content, &quot;template_part_{$area}&quot; );

	/**
	 * Handle embeds for block template parts.
	 *
	 * @global WP_Embed $wp_embed WordPress Embed object.
	 */
	global $wp_embed;
	$content = $wp_embed-&gt;autoembed( $content );

	if ( empty( $attributes[&#039;tagName&#039;] ) || tag_escape( $attributes[&#039;tagName&#039;] ) !== $attributes[&#039;tagName&#039;] ) {
		$area_tag = &#039;div&#039;;
		if ( $area_definition &amp;&amp; isset( $area_definition[&#039;area_tag&#039;] ) ) {
			$area_tag = $area_definition[&#039;area_tag&#039;];
		}
		$html_tag = $area_tag;
	} else {
		$html_tag = esc_attr( $attributes[&#039;tagName&#039;] );
	}
	$wrapper_attributes = get_block_wrapper_attributes();

	return &quot;&lt;$html_tag $wrapper_attributes&gt;&quot; . str_replace( &#039;]]&gt;&#039;, &#039;]]&amp;gt;&#039;, $content ) . &quot;&lt;/$html_tag&gt;&quot;;
}

/**
 * Returns an array of area variation objects for the template part block.
 *
 * @since 6.1.0
 *
 * @param array $instance_variations The variations for instances.
 *
 * @return array Array containing the block variation objects.
 */
function build_template_part_block_area_variations( $instance_variations ) {
	$variations    = array();
	$defined_areas = get_allowed_block_template_part_areas();

	foreach ( $defined_areas as $area ) {
		if ( &#039;uncategorized&#039; !== $area[&#039;area&#039;] &amp;&amp; &#039;navigation-overlay&#039; !== $area[&#039;area&#039;] ) {
			$has_instance_for_area = false;
			foreach ( $instance_variations as $variation ) {
				if ( $variation[&#039;attributes&#039;][&#039;area&#039;] === $area[&#039;area&#039;] ) {
					$has_instance_for_area = true;
					break;
				}
			}

			$scope = $has_instance_for_area ? array() : array( &#039;inserter&#039; );

			$variations[] = array(
				&#039;name&#039;        =&gt; &#039;area_&#039; . $area[&#039;area&#039;],
				&#039;title&#039;       =&gt; $area[&#039;label&#039;],
				&#039;description&#039; =&gt; $area[&#039;description&#039;],
				&#039;attributes&#039;  =&gt; array(
					&#039;area&#039; =&gt; $area[&#039;area&#039;],
				),
				&#039;scope&#039;       =&gt; $scope,
				&#039;icon&#039;        =&gt; $area[&#039;icon&#039;],
			);
		}
	}
	return $variations;
}

/**
 * Returns an array of instance variation objects for the template part block
 *
 * @since 6.1.0
 *
 * @return array Array containing the block variation objects.
 */
function build_template_part_block_instance_variations() {
	// Block themes are unavailable during installation.
	if ( wp_installing() ) {
		return array();
	}

	if ( ! current_theme_supports( &#039;block-templates&#039; ) &amp;&amp; ! current_theme_supports( &#039;block-template-parts&#039; ) ) {
		return array();
	}

	$variations     = array();
	$template_parts = get_block_templates(
		array(
			&#039;post_type&#039; =&gt; &#039;wp_template_part&#039;,
		),
		&#039;wp_template_part&#039;
	);

	$defined_areas = get_allowed_block_template_part_areas();
	$icon_by_area  = array_combine( array_column( $defined_areas, &#039;area&#039; ), array_column( $defined_areas, &#039;icon&#039; ) );

	foreach ( $template_parts as $template_part ) {
		// Navigation overlay template parts should not appear in the
		// general inserter. They are managed through the Navigation
		// block&#039;s overlay template part selector.
		$scope = ( &#039;navigation-overlay&#039; === $template_part-&gt;area )
			? array()
			: array( &#039;inserter&#039; );

		$variations[] = array(
			&#039;name&#039;        =&gt; &#039;instance_&#039; . sanitize_title( $template_part-&gt;slug ),
			&#039;title&#039;       =&gt; $template_part-&gt;title,
			// If there&#039;s no description for the template part don&#039;t show the
			// block description. This is a bit hacky, but prevent the fallback
			// by using a non-breaking space so that the value of description
			// isn&#039;t falsey.
			&#039;description&#039; =&gt; $template_part-&gt;description || &#039;&amp;nbsp;&#039;,
			&#039;attributes&#039;  =&gt; array(
				&#039;slug&#039;  =&gt; $template_part-&gt;slug,
				&#039;theme&#039; =&gt; $template_part-&gt;theme,
				&#039;area&#039;  =&gt; $template_part-&gt;area,
			),
			&#039;scope&#039;       =&gt; $scope,
			&#039;icon&#039;        =&gt; $icon_by_area[ $template_part-&gt;area ] ?? null,
			&#039;example&#039;     =&gt; array(
				&#039;attributes&#039; =&gt; array(
					&#039;slug&#039;  =&gt; $template_part-&gt;slug,
					&#039;theme&#039; =&gt; $template_part-&gt;theme,
					&#039;area&#039;  =&gt; $template_part-&gt;area,
				),
			),
		);
	}
	return $variations;
}

/**
 * Returns an array of all template part block variations.
 *
 * @since 5.9.0
 *
 * @return array Array containing the block variation objects.
 */
function build_template_part_block_variations() {
	$instance_variations = build_template_part_block_instance_variations();
	$area_variations     = build_template_part_block_area_variations( $instance_variations );
	return array_merge( $area_variations, $instance_variations );
}

/**
 * Registers the `core/template-part` block on the server.
 *
 * @since 5.9.0
 */
function register_block_core_template_part() {
	register_block_type_from_metadata(
		__DIR__ . &#039;/template-part&#039;,
		array(
			&#039;render_callback&#039;    =&gt; &#039;render_block_core_template_part&#039;,
			&#039;variation_callback&#039; =&gt; &#039;build_template_part_block_variations&#039;,
		)
	);
}
add_action( &#039;init&#039;, &#039;register_block_core_template_part&#039; );
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