perl_matcher_recursive.hpp

C++的一个好库。。。现在很流行

         ++state_count;
         if(match_all_states())
            return true;
         if(count >= rep->max)
            return false;
         ++count;
         pstate = psingle;
         position = save_pos;
         if(!match_wild())
            return false;
      }while(true);
   }
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_dot_repeat_fast()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
   if(m_match_flags & match_not_dot_null)
      return match_dot_repeat_slow();
   if((static_cast<const re_dot*>(pstate->next.p)->mask & match_any_mask) == 0)
      return match_dot_repeat_slow();
   //
   // start by working out how much we can skip:
   //
   const re_repeat* rep = static_cast<const re_repeat*>(pstate);
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4267)
#endif
   bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);   
   std::size_t count = (std::min)(static_cast<std::size_t>(::boost::re_detail::distance(position, last)), static_cast<std::size_t>(greedy ? rep->max : rep->min));
   if(rep->min > count)
   {
      position = last;
      return false;  // not enough text left to match
   }
   std::advance(position, count);
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
   if((rep->leading) && (count < rep->max) && greedy)
      restart = position;
   if(greedy)
      return backtrack_till_match(count - rep->min);

   // non-greedy, keep trying till we get a match:
   BidiIterator save_pos;
   do
   {
      while((position != last) && (count < rep->max) && !can_start(*position, rep->_map, mask_skip))
      {
         ++position;
         ++count;
      }
      if((rep->leading) && (rep->max == UINT_MAX))
         restart = position;
      pstate = rep->alt.p;
      save_pos = position;
      ++state_count;
      if(match_all_states())
         return true;
      if(count >= rep->max)
         return false;
      if(position == last)
         return false;
      position = ++save_pos;
      ++count;
   }while(true);
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_char_repeat()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef __BORLANDC__
#pragma option push -w-8008 -w-8066 -w-8004
#endif
   const re_repeat* rep = static_cast<const re_repeat*>(pstate);
   BOOST_ASSERT(1 == static_cast<const re_literal*>(rep->next.p)->length);
   const char_type what = *reinterpret_cast<const char_type*>(static_cast<const re_literal*>(rep->next.p) + 1);
   unsigned count = 0;
   //
   // start by working out how much we can skip:
   //
   bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);   
   std::size_t desired = greedy ? rep->max : rep->min;
   if(::boost::is_random_access_iterator<BidiIterator>::value)
   {
      BidiIterator end = position;
      std::advance(end, (std::min)((std::size_t)::boost::re_detail::distance(position, last), desired));
      BidiIterator origin(position);
      while((position != end) && (traits_inst.translate(*position, icase) == what))
      {
         ++position;
      }
      count = (unsigned)::boost::re_detail::distance(origin, position);
   }
   else
   {
      while((count < desired) && (position != last) && (traits_inst.translate(*position, icase) == what))
      {
         ++position;
         ++count;
      }
   }
   if((rep->leading) && (count < rep->max) && greedy)
      restart = position;
   if(count < rep->min)
      return false;

   if(greedy)
      return backtrack_till_match(count - rep->min);

   // non-greedy, keep trying till we get a match:
   BidiIterator save_pos;
   do
   {
      while((position != last) && (count < rep->max) && !can_start(*position, rep->_map, mask_skip))
      {
         if((traits_inst.translate(*position, icase) == what))
         {
            ++position;
            ++count;
         }
         else
            return false;  // counldn't repeat even though it was the only option
      }
      if((rep->leading) && (rep->max == UINT_MAX))
         restart = position;
      pstate = rep->alt.p;
      save_pos = position;
      ++state_count;
      if(match_all_states())
         return true;
      if(count >= rep->max)
         return false;
      if(position == last)
         return false;
      position = save_pos;
      if(traits_inst.translate(*position, icase) == what)
      {
         ++position;
         ++count;
      }
      else
      {
         return false;
      }
   }while(true);
#ifdef __BORLANDC__
#pragma option pop
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_set_repeat()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef __BORLANDC__
#pragma option push -w-8008 -w-8066 -w-8004
#endif
   const re_repeat* rep = static_cast<const re_repeat*>(pstate);
   const unsigned char* map = static_cast<const re_set*>(rep->next.p)->_map;
   unsigned count = 0;
   //
   // start by working out how much we can skip:
   //
   bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);   
   std::size_t desired = greedy ? rep->max : rep->min;
   if(::boost::is_random_access_iterator<BidiIterator>::value)
   {
      BidiIterator end = position;
      std::advance(end, (std::min)((std::size_t)::boost::re_detail::distance(position, last), desired));
      BidiIterator origin(position);
      while((position != end) && map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
      {
         ++position;
      }
      count = (unsigned)::boost::re_detail::distance(origin, position);
   }
   else
   {
      while((count < desired) && (position != last) && map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
      {
         ++position;
         ++count;
      }
   }
   if((rep->leading) && (count < rep->max) && greedy)
      restart = position;
   if(count < rep->min)
      return false;

   if(greedy)
      return backtrack_till_match(count - rep->min);

   // non-greedy, keep trying till we get a match:
   BidiIterator save_pos;
   do
   {
      while((position != last) && (count < rep->max) && !can_start(*position, rep->_map, mask_skip))
      {
         if(map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
         {
            ++position;
            ++count;
         }
         else
            return false;  // counldn't repeat even though it was the only option
      }
      if((rep->leading) && (rep->max == UINT_MAX))
         restart = position;
      pstate = rep->alt.p;
      save_pos = position;
      ++state_count;
      if(match_all_states())
         return true;
      if(count >= rep->max)
         return false;
      if(position == last)
         return false;
      position = save_pos;
      if(map[static_cast<unsigned char>(traits_inst.translate(*position, icase))])
      {
         ++position;
         ++count;
      }
      else
      {
         return false;
      }
   }while(true);
#ifdef __BORLANDC__
#pragma option pop
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::match_long_set_repeat()
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
#ifdef __BORLANDC__
#pragma option push -w-8008 -w-8066 -w-8004
#endif
   typedef typename traits::char_class_type char_class_type;
   const re_repeat* rep = static_cast<const re_repeat*>(pstate);
   const re_set_long<char_class_type>* set = static_cast<const re_set_long<char_class_type>*>(pstate->next.p);
   unsigned count = 0;
   //
   // start by working out how much we can skip:
   //
   bool greedy = (rep->greedy) && (!(m_match_flags & regex_constants::match_any) || m_independent);   
   std::size_t desired = greedy ? rep->max : rep->min;
   if(::boost::is_random_access_iterator<BidiIterator>::value)
   {
      BidiIterator end = position;
      std::advance(end, (std::min)((std::size_t)::boost::re_detail::distance(position, last), desired));
      BidiIterator origin(position);
      while((position != end) && (position != re_is_set_member(position, last, set, re.get_data(), icase)))
      {
         ++position;
      }
      count = (unsigned)::boost::re_detail::distance(origin, position);
   }
   else
   {
      while((count < desired) && (position != last) && (position != re_is_set_member(position, last, set, re.get_data(), icase)))
      {
         ++position;
         ++count;
      }
   }
   if((rep->leading) && (count < rep->max) && greedy)
      restart = position;
   if(count < rep->min)
      return false;

   if(greedy)
      return backtrack_till_match(count - rep->min);

   // non-greedy, keep trying till we get a match:
   BidiIterator save_pos;
   do
   {
      while((position != last) && (count < rep->max) && !can_start(*position, rep->_map, mask_skip))
      {
         if(position != re_is_set_member(position, last, set, re.get_data(), icase))
         {
            ++position;
            ++count;
         }
         else
            return false;  // counldn't repeat even though it was the only option
      }
      if((rep->leading) && (rep->max == UINT_MAX))
         restart = position;
      pstate = rep->alt.p;
      save_pos = position;
      ++state_count;
      if(match_all_states())
         return true;
      if(count >= rep->max)
         return false;
      if(position == last)
         return false;
      position = save_pos;
      if(position != re_is_set_member(position, last, set, re.get_data(), icase))
      {
         ++position;
         ++count;
      }
      else
      {
         return false;
      }
   }while(true);
#ifdef __BORLANDC__
#pragma option pop
#endif
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

template <class BidiIterator, class Allocator, class traits>
bool perl_matcher<BidiIterator, Allocator, traits>::backtrack_till_match(std::size_t count)
{
#ifdef BOOST_MSVC
#pragma warning(push)
#pragma warning(disable:4127)
#endif
   if((m_match_flags & match_partial) && (position == last))
      m_has_partial_match = true;

   const re_repeat* rep = static_cast<const re_repeat*>(pstate);
   BidiIterator backtrack = position;
   if(position == last)
   {
      if(rep->can_be_null & mask_skip) 
      {
         pstate = rep->alt.p;
         if(match_all_states())
            return true;
      }
      if(count)
      {
         position = --backtrack;
         --count;
      }
      else
         return false;
   }
   do
   {
      while(count && !can_start(*position, rep->_map, mask_skip))
      {
         --position;
         --count;
         ++state_count;
      }
      pstate = rep->alt.p;
      backtrack = position;
      if(match_all_states())
         return true;
      if(count == 0)
         return false;
      position = --backtrack;
      ++state_count;
      --count;
   }while(true);
#ifdef BOOST_MSVC
#pragma warning(pop)
#endif
}

} // namespace re_detail
} // namespace boost

#ifdef BOOST_HAS_ABI_HEADERS
#  include BOOST_ABI_SUFFIX
#endif

#endif