Function parse_format_string

include/fmt/base.h:1629–1646

template <typename Char, typename Handler>
FMT_CONSTEXPR void parse_format_string(basic_string_view<Char> fmt,
                                       Handler&& handler) {
  auto begin = fmt.data(), end = begin + fmt.size();
  auto p = begin;
  while (p != end) {
    auto c = *p++;
    if (c == '{') {
      handler.on_text(begin, p - 1);
      begin = p = parse_replacement_field(p - 1, end, handler);
    } else if (c == '}') {
      if (p == end || *p != '}')
        return handler.on_error("unmatched '}' in format string");
      handler.on_text(begin, p);
      begin = ++p;
    }
  }
  handler.on_text(begin, end);
}

// Checks char specs and returns true iff the presentation type is char-like.
FMT_CONSTEXPR inline auto check_char_specs(const format_specs& specs) -> bool {