<?php

/**

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

 *

 * @package WordPress

 */

/**

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

 *

 * @return void

 */

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.

 *

 * @param array $attributes Block attributes.

 *

 * @return string Returns the output of the pattern.

 */

function render_block_core_pattern( $attributes ) {

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

		return '';

	}

	$slug     = $attributes['slug'];

	$registry = WP_Block_Patterns_Registry::get_instance();

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

		return '';

	}

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

	return do_blocks( $pattern['content'] );

}

add_action( 'init', 'register_block_core_pattern' );