<?php

/**

 * Server-side rendering of the `core/pattern` block.

 *

 * @package WordPress

 */

/**

 *  Registers the `core/pattern` block on the server.

 *

 * @since 5.9.0

 */

function register_block_core_pattern() {

	register_block_type_from_metadata(

		__DIR__ . '/pattern',

		array(

			'render_callback' => 'render_block_core_pattern',

		)

	);

}

/**

 * Renders the `core/pattern` block on the server.

 *

 * @since 6.3.0 Backwards compatibility: blocks with no `syncStatus` attribute do not receive block wrapper.

 *

 * @global WP_Embed $wp_embed Used to process embedded content within patterns

 *

 * @param array $attributes Block attributes.

 *

 * @return string Returns the output of the pattern.

 */

function render_block_core_pattern( $attributes ) {

	static $seen_refs = array();

	if ( empty( $attributes['slug'] ) ) {

		return '';

	}

	$slug     = $attributes['slug'];

	$registry = WP_Block_Patterns_Registry::get_instance();

	if ( ! $registry->is_registered( $slug ) ) {

		return '';

	}

	if ( isset( $seen_refs[ $attributes['slug'] ] ) ) {

		// WP_DEBUG_DISPLAY must only be honored when WP_DEBUG. This precedent

		// is set in `wp_debug_mode()`.

		$is_debug = WP_DEBUG && WP_DEBUG_DISPLAY;

		return $is_debug ?

			// translators: Visible only in the front end, this warning takes the place of a faulty block. %s represents a pattern's slug.

			sprintf( __( '[block rendering halted for pattern "%s"]' ), $slug ) :

			'';

	}

	$pattern = $registry->get_registered( $slug );

	$content = $pattern['content'];

	$seen_refs[ $attributes['slug'] ] = true;

	$content = do_blocks( $content );

	global $wp_embed;

	$content = $wp_embed->autoembed( $content );

	unset( $seen_refs[ $attributes['slug'] ] );

	return $content;

}

add_action( 'init', 'register_block_core_pattern' );