<?php

/**

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

 *

 * @package WordPress

 */

/**

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

 *

 * @param array $attributes The block attributes.

 *

 * @return string Rendered HTML of the referenced block.

 */

function render_block_core_block( $attributes ) {

	static $seen_refs = array();

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

		return '';

	}

	$reusable_block = get_post( $attributes['ref'] );

	if ( ! $reusable_block || 'wp_block' !== $reusable_block->post_type ) {

		return '';

	}

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

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

		// is set in `wp_debug_mode()`.

		$is_debug = defined( 'WP_DEBUG' ) && WP_DEBUG &&

			defined( 'WP_DEBUG_DISPLAY' ) && WP_DEBUG_DISPLAY;

		return $is_debug ?

			// translators: Visible only in the front end, this warning takes the place of a faulty block.

			__( '[block rendering halted]' ) :

			'';

	}

	if ( 'publish' !== $reusable_block->post_status || ! empty( $reusable_block->post_password ) ) {

		return '';

	}

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

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

}

/**

 * Registers the `core/block` block.

 */

function register_block_core_block() {

	register_block_type_from_metadata(

		__DIR__ . '/block',

		array(

			'render_callback' => 'render_block_core_block',

		)

	);

}

add_action( 'init', 'register_block_core_block' );