Function set_end

3rd/wildcards/include/wildcards/match.hpp:198–302

template <typename PatternIterator>
constexpr PatternIterator set_end(
    PatternIterator p, PatternIterator pend,
    const cards<iterated_item_t<PatternIterator>>& c = cards<iterated_item_t<PatternIterator>>(),
    set_end_state state = set_end_state::open)
{
#if cfg_HAS_CONSTEXPR14

  if (!c.set_enabled)
  {
#if cfg_HAS_FULL_FEATURED_CONSTEXPR14
    throw std::invalid_argument("The use of sets is disabled");
#else
    return throw_invalid_argument(p, "The use of sets is disabled");
#endif
  }

  while (p != pend)
  {
    switch (state)
    {
      case set_end_state::open:
        if (*p != c.set_open)
        {
#if cfg_HAS_FULL_FEATURED_CONSTEXPR14
          throw std::invalid_argument("The given pattern is not a valid set");
#else
          return throw_invalid_argument(p, "The given pattern is not a valid set");
#endif
        }

        state = set_end_state::not_or_first;
        break;

      case set_end_state::not_or_first:
        if (*p == c.set_not)
        {
          state = set_end_state::first;
        }
        else
        {
          state = set_end_state::next;
        }

        break;

      case set_end_state::first:
        state = set_end_state::next;
        break;

      case set_end_state::next:
        if (*p == c.set_close)
        {
          return cx::next(p);
        }

        break;

      default: