string code;
  for (const Line& line : lines_) {
    absl::StrAppend(&code, string(line.indent * spaces_per_indent_, ' '),
                    line.text, "\n");
  }
  return code;
}

void SourceCode::AddLineWithIndent(const string& line) {
  ValidateAndAddLine(current_indent_, line);
}

void SourceCode::AddLineWithoutIndent(const string& line) {
  ValidateAndAddLine(0, line);
}