_wp_add_block_level_presets_class( string $block_content, array $block ): string

36function _wp_add_block_level_presets_class( $block_content, $block ) {37	if ( ! $block_content ) {38		return $block_content;39	}40 41	// return early if the block doesn't have support for settings.42	$block_type = WP_Block_Type_Registry::get_instance()->get_registered( $block['blockName'] );43	if ( ! block_has_support( $block_type, '__experimentalSettings', false ) ) {44		return $block_content;45	}46 47	// return early if no settings are found on the block attributes.48	$block_settings = $block['attrs']['settings'] ?? null;49	if ( empty( $block_settings ) ) {50		return $block_content;51	}52 53	// Like the layout hook this assumes the hook only applies to blocks with a single wrapper.54	// Add the class name to the first element, presuming it's the wrapper, if it exists.55	$tags = new WP_HTML_Tag_Processor( $block_content );56	if ( $tags->next_tag() ) {57		$tags->add_class( _wp_get_presets_class_name( $block ) );58	}59 60	return $tags->get_updated_html();61}