<?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'] ] ) ) {
if ( ! is_admin() ) {
trigger_error(
sprintf(
// translators: %s is the user-provided title of the reusable block.
__( 'Could not render Reusable Block <strong>%s</strong>: blocks cannot be rendered inside themselves.' ),
$reusable_block->post_title
),
E_USER_WARNING
);
}
// 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;
$result = do_blocks( $reusable_block->post_content );
unset( $seen_refs[ $attributes['ref'] ] );
return $result;
}
/**
* 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' );