struct IndentedToStringVisitor : flatbuffers::ToStringVisitor {
  std::string indent_str;
  int indent_level;

  IndentedToStringVisitor(const std::string& delimiter,
                          const std::string& indent)
      : ToStringVisitor(delimiter), indent_str(indent), indent_level(0) {}

  void indent() {
    for (int i = 0; i < indent_level; ++i) s.append(indent_str);
  }

  // Adjust indention for fields in sequences.

  """Indents and newlines the XML for better output."""
  indent_str = '\n' + level * '  '
  if len(elem):  # pylint: disable=g-explicit-length-test  # `if elem` not valid
    if not elem.text or not elem.text.strip():
      elem.text = indent_str + '  '
    if not elem.tail or not elem.tail.strip():
      elem.tail = indent_str
    for elem in elem:
      indent_xml(elem, level + 1)