class Node {
  const Node(
    this.name, [
    this.props = const {},
    this.children = const [],
  ]);

  final String name;
  final Map<String, Object?> props;
  final List<Node> children;

  @override
  String toString() =>
      '($name${props.entries.map((e) => ' :${e.key} ${_q(e.value)}').join()}${children.map((c) => ' $c').join()})';

  static String _q(Object? v) => switch (v) {
    null => 'nil',
    String v => '"$v"',
    List v => '(${v.map(_q).join(' ')})',
    Map v => '(${v.entries.map((e) => ':${e.key} ${_q(e.value)}').join(' ')})',
    _ => '$v',
  };
}