format.cpp

std::tuple<ast_block_t, token_vec_t::const_iterator>
parse_block(token_vec_t::const_iterator parse_begin,
            token_vec_t::const_iterator parse_end) {
  std::vector<ast_node_ptr_t> block_content;
  for (; parse_begin != parse_end; parse_begin++) {
    if (*parse_begin == while_end_v) {
      return {std::move(block_content), parse_begin};
    } else if (*parse_begin == while_begin_v) {
      auto [while_block_content, while_block_end] =
          parse_block(parse_begin + 1, parse_end);
      block_content.push_back(
          std::make_unique<ast_while_t>(std::move(while_block_content)));
      parse_begin = while_block_end;
    } else if (*parse_begin != nop_v) {
      block_content.push_back(
          ast_node_ptr_t(std::make_unique<ast_token_t>(*parse_begin)));
    }
  }
  return {ast_block_t(std::move(block_content)), parse_end};
}