to_ruleset example

$spacing_rule['selector']
                                    );
                                } else {
                                    $format          = static::ROOT_BLOCK_SELECTOR === $selector ? ':where(%s .%s) %s' : '%s-%s%s';
                                    $layout_selector = sprintf(
                                        $format,
                                        $selector,
                                        $class_name,
                                        $spacing_rule['selector']
                                    );
                                }
                                $block_rules .= static::to_ruleset( $layout_selector, $declarations );
                            }
                        }
                    }
                }
            }
        }

        // Output base styles.         if (
            static::ROOT_BLOCK_SELECTOR === $selector
        ) {