void basic_printf_context::format()

in src/main/cpp/sdk/common/spdlog/fmt/bundled/printf.h [596:699]

• 87 lines of code
• 25 McCabe index (conditional complexity)

void basic_printf_context<OutputIt, Char, AF>::format() {
  auto &buffer = internal::get_container(this->out());
  auto start = iterator(this->parse_context());
  auto it = start;
  using internal::pointer_from;
  while (*it) {
    char_type c = *it++;
    if (c != '%') continue;
    if (*it == c) {
      buffer.append(pointer_from(start), pointer_from(it));
      start = ++it;
      continue;
    }
    buffer.append(pointer_from(start), pointer_from(it) - 1);

    format_specs spec;
    spec.align_ = ALIGN_RIGHT;

    // Parse argument index, flags and width.
    unsigned arg_index = parse_header(it, spec);

    // Parse precision.
    if (*it == '.') {
      ++it;
      if ('0' <= *it && *it <= '9') {
        internal::error_handler eh;
        spec.precision = static_cast<int>(parse_nonnegative_int(it, eh));
      } else if (*it == '*') {
        ++it;
        spec.precision =
            visit_format_arg(internal::printf_precision_handler(), get_arg(it));
      } else {
        spec.precision = 0;
      }
    }

    format_arg arg = get_arg(it, arg_index);
    if (spec.has(HASH_FLAG) && visit_format_arg(internal::is_zero_int(), arg))
      spec.flags = static_cast<uint_least8_t>(spec.flags & (~internal::to_unsigned<int>(HASH_FLAG)));
    if (spec.fill_ == '0') {
      if (arg.is_arithmetic())
        spec.align_ = ALIGN_NUMERIC;
      else
        spec.fill_ = ' ';  // Ignore '0' flag for non-numeric types.
    }

    // Parse length and convert the argument to the required type.
    using internal::convert_arg;
    switch (*it++) {
    case 'h':
      if (*it == 'h')
        convert_arg<signed char>(arg, *++it);
      else
        convert_arg<short>(arg, *it);
      break;
    case 'l':
      if (*it == 'l')
        convert_arg<long long>(arg, *++it);
      else
        convert_arg<long>(arg, *it);
      break;
    case 'j':
      convert_arg<intmax_t>(arg, *it);
      break;
    case 'z':
      convert_arg<std::size_t>(arg, *it);
      break;
    case 't':
      convert_arg<std::ptrdiff_t>(arg, *it);
      break;
    case 'L':
      // printf produces garbage when 'L' is omitted for long double, no
      // need to do the same.
      break;
    default:
      --it;
      convert_arg<void>(arg, *it);
    }

    // Parse type.
    if (!*it)
      FMT_THROW(format_error("invalid format string"));
    spec.type = static_cast<char>(*it++);
    if (arg.is_integral()) {
      // Normalize type.
      switch (spec.type) {
      case 'i': case 'u':
        spec.type = 'd';
        break;
      case 'c':
        // TODO: handle wchar_t better?
        visit_format_arg(
              internal::char_converter<basic_printf_context>(arg), arg);
        break;
      }
    }

    start = it;

    // Format argument.
    visit_format_arg(AF(buffer, spec, *this), arg);
  }
  buffer.append(pointer_from(start), pointer_from(it));
}