<?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' );