json_never_inline T decode_integer()

in include/spotify/json/codec/number.hpp [336:361]

• 23 lines of code
• 5 McCabe index (conditional complexity)

json_never_inline T decode_integer(decode_context &context) {
  using intops = integer_ops<T, is_positive>;
  const auto pos = context.position;
  const auto next_char = next(context);
  const auto next_char_as_int = to_integer<T>(next_char);
  fail_if(context, is_invalid_digit(next_char_as_int), "Invalid integer");
  T value = intops::accumulate(0, next_char_as_int);

  while (json_likely(context.remaining())) {
    const auto next_unchecked = peek_unchecked(context);
    const auto next_unchecked_as_int = to_integer<T>(next_unchecked);
    if (is_invalid_digit(next_unchecked_as_int)) {
      const auto is_tricky = ((next_unchecked == '.') | (next_unchecked == 'e') | (next_unchecked == 'E'));
      return (json_unlikely(is_tricky) ? decode_integer_tricky<T, is_positive>(context, pos) : value);
    }

    skip_unchecked_1(context);
    const auto old_value = value;
    value = intops::accumulate(value * 10, next_unchecked_as_int);
    if (json_unlikely(intops::is_overflow(old_value, value))) {
      return decode_integer_tricky<T, is_positive>(context, pos);
    }
  }

  return value;
}