1<?php
  2/**
  3 * Server-side rendering of the `core/pattern` block.
  4 *
  5 * @package WordPress
  6 */
  7
  8/**
  9 *  Registers the `core/pattern` block on the server.
 10 *
 11 * @since 5.9.0
 12 */
 13function register_block_core_pattern() {
 14	register_block_type_from_metadata(
 15		__DIR__ . '/pattern',
 16		array(
 17			'render_callback' => 'render_block_core_pattern',
 18		)
 19	);
 20}
 21
 22/**
 23 * Renders the `core/pattern` block on the server.
 24 *
 25 * @since 6.3.0 Backwards compatibility: blocks with no `syncStatus` attribute do not receive block wrapper.
 26 *
 27 * @global WP_Embed $wp_embed Used to process embedded content within patterns
 28 *
 29 * @param array $attributes Block attributes.
 30 *
 31 * @return string Returns the output of the pattern.
 32 */
 33function render_block_core_pattern( $attributes ) {
 34	static $seen_refs = array();
 35
 36	if ( empty( $attributes['slug'] ) ) {
 37		return '';
 38	}
 39
 40	$slug     = $attributes['slug'];
 41	$registry = WP_Block_Patterns_Registry::get_instance();
 42
 43	if ( ! $registry->is_registered( $slug ) ) {
 44		return '';
 45	}
 46
 47	if ( isset( $seen_refs[ $attributes['slug'] ] ) ) {
 48		// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent
 49		// is set in `wp_debug_mode()`.
 50		$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;
 51
 52		return $is_debug ?
 53			// translators: Visible only in the front end, this warning takes the place of a faulty block. %s represents a pattern's slug.
 54			sprintf( __( '[block rendering halted for pattern "%s"]' ), $slug ) :
 55			'';
 56	}
 57
 58	$pattern = $registry->get_registered( $slug );
 59	$content = $pattern['content'];
 60
 61	$seen_refs[ $attributes['slug'] ] = true;
 62
 63	$content = do_blocks( $content );
 64
 65	global $wp_embed;
 66	$content = $wp_embed->autoembed( $content );
 67
 68	unset( $seen_refs[ $attributes['slug'] ] );
 69	return $content;
 70}
 71
 72add_action( 'init', 'register_block_core_pattern' );
 73