regex_format.hpp

boost库提供标准的C++ API 配合dev c++使用,功能更加强大

                  *out = *fmt;
                  ++out;
                  ++fmt;
                  continue;
               }
               c = (charT)traits_inst.toi(fmt, fmt_end, -16);
            }
            break;
         case traits_type::syntax_c:
            ++fmt;
            if(fmt == fmt_end)
            {
               --fmt;
               *out = *fmt;
               ++out;
               return out;
            }
            if(((typename traits_type::uchar_type)(*fmt) < (typename traits_type::uchar_type)'@')
                  || ((typename traits_type::uchar_type)(*fmt) > (typename traits_type::uchar_type)127) )
            {
               --fmt;
               *out = *fmt;
               ++out;
               ++fmt;
               break;
            }
            c = (charT)((typename traits_type::uchar_type)(*fmt) - (typename traits_type::uchar_type)'@');
            ++fmt;
            break;
         case traits_type::syntax_e:
            c = (charT)27;
            ++fmt;
            break;
         case traits_type::syntax_digit:
            if(flags & format_sed)
               goto expand_sub;
            else
               c = (charT)traits_inst.toi(fmt, fmt_end, -8);
            break;
         default:
            //c = *fmt;
            ++fmt;
         }
         *out = c;
         ++out;
         continue;
      }
      case traits_type::syntax_open_bracket:
         if(flags & (format_sed|format_perl))
         {
            *out = *fmt;
            ++out;
            ++fmt;
            continue;
         }
         else
         {
            ++fmt;  // recurse
            oi_assign(&out, _reg_format_aux(out, m, fmt, flags, traits_inst));
            continue;
         }
      case traits_type::syntax_close_bracket:
         if(flags & (format_sed|format_perl))
         {
            *out = *fmt;
            ++out;
            ++fmt;
            continue;
         }
         else
         {
            ++fmt;  // return from recursion
            return out;
         }
      case traits_type::syntax_colon:
         if(flags & format_is_if)
         {
            ++fmt;
            return out;
         }
         *out = *fmt;
         ++out;
         ++fmt;
         continue;
      case traits_type::syntax_question:
      {
         if(flags & (format_sed|format_perl))
         {
            *out = *fmt;
            ++out;
            ++fmt;
            continue;
         }
         else
         {
            ++fmt;
            if(*fmt == 0)
            {
               --fmt;
               *out = *fmt;
               ++out;
               ++fmt;
               return out;
            }
            unsigned int id = traits_inst.toi(fmt, fmt_end, 10);
            if(m[id].matched)
            {
               oi_assign(&out, _reg_format_aux(out, m, fmt, flags | format_is_if, traits_inst));
               if(traits_inst.syntax_type((traits_size_type)(traits_uchar_type)(*(fmt-1))) == traits_type::syntax_colon)
                  re_skip_format(fmt, traits_inst);
            }
            else
            {
               re_skip_format(fmt, traits_inst);
               if(traits_inst.syntax_type((traits_size_type)(traits_uchar_type)(*(fmt-1))) == traits_type::syntax_colon)
                  oi_assign(&out, _reg_format_aux(out, m, fmt, flags | format_is_if, traits_inst));
            }
            return out;
         }
      }
      default:
default_opt:
         if((flags & format_sed) && (*fmt == '&'))
         {
            oi_assign(&out, re_copy_out(out, Iterator(m[0].first), Iterator(m[0].second)));
            ++fmt;
            continue;
         }
         *out = *fmt;
         ++out;
         ++fmt;
      }
   }

   return out;
}

#if defined(BOOST_REGEX_NO_TEMPLATE_SWITCH_MERGE)
} // namespace
#endif

template <class S>
class string_out_iterator
{
   S* out;
public:
   string_out_iterator(S& s) : out(&s) {}
   string_out_iterator& operator++() { return *this; }
   string_out_iterator& operator++(int) { return *this; }
   string_out_iterator& operator*() { return *this; }
   string_out_iterator& operator=(typename S::value_type v) 
   { 
      out->append(1, v); 
      return *this; 
   }
};

template <class OutputIterator, class Iterator, class charT, class Allocator, class traits_type>
class merge_out_predicate
{
   OutputIterator* out;
   Iterator* last;
   const charT* fmt;
   unsigned flags;
   const traits_type* pt;

public:
   merge_out_predicate(OutputIterator& o, Iterator& pi, const charT* f, unsigned format_flags, const traits_type& p)
      : out(&o), last(&pi), fmt(f), flags(format_flags), pt(&p){}

   ~merge_out_predicate() {}
   bool BOOST_REGEX_CALL operator()(const boost::match_results<Iterator, Allocator>& m)
   {
      const charT* f = fmt;
      if(0 == (flags & format_no_copy))
         oi_assign(out, re_copy_out(*out, Iterator(m[-1].first), Iterator(m[-1].second)));
      oi_assign(out, _reg_format_aux(*out, m, f, flags, *pt));
      *last = m[-2].first;
      return flags & format_first_only ? false : true;
   }
};

} // namespace re_detail

template <class OutputIterator, class Iterator, class Allocator, class charT>
OutputIterator regex_format(OutputIterator out,
                          const match_results<Iterator, Allocator>& m,
                          const charT* fmt,
                          unsigned flags = 0
                         )
{
   regex_traits<charT> t;
   return re_detail::_reg_format_aux(out, m, fmt, flags, t);
}

template <class OutputIterator, class Iterator, class Allocator, class charT>
OutputIterator regex_format(OutputIterator out,
                          const match_results<Iterator, Allocator>& m,
                          const std::basic_string<charT>& fmt,
                          unsigned flags = 0
                         )
{
   regex_traits<charT> t;
   const charT* start = fmt.c_str();
   return re_detail::_reg_format_aux(out, m, start, flags, t);
}  

template <class Iterator, class Allocator, class charT>
std::basic_string<charT> regex_format(const match_results<Iterator, Allocator>& m, const charT* fmt, unsigned flags = 0)
{
   std::basic_string<charT> result;
   re_detail::string_out_iterator<std::basic_string<charT> > i(result);
   regex_format(i, m, fmt, flags);
   return result;
}

template <class Iterator, class Allocator, class charT>
std::basic_string<charT> regex_format(const match_results<Iterator, Allocator>& m, const std::basic_string<charT>& fmt, unsigned flags = 0)
{
   std::basic_string<charT> result;
   re_detail::string_out_iterator<std::basic_string<charT> > i(result);
   regex_format(i, m, fmt.c_str(), flags);
   return result;
}

template <class OutputIterator, class Iterator, class traits, class Allocator, class charT>
OutputIterator regex_merge(OutputIterator out,
                         Iterator first,
                         Iterator last,
                         const reg_expression<charT, traits, Allocator>& e, 
                         const charT* fmt, 
                         unsigned int flags = match_default)
{
   Iterator l = first;
   re_detail::merge_out_predicate<OutputIterator, Iterator, charT, Allocator, traits> oi(out, l, fmt, flags, e.get_traits());
   regex_grep(oi, first, last, e, flags);
   return (flags & format_no_copy) ? out : re_detail::re_copy_out(out, l, last);
}

template <class OutputIterator, class Iterator, class traits, class Allocator, class charT>
inline OutputIterator regex_merge(OutputIterator out,
                         Iterator first,
                         Iterator last,
                         const reg_expression<charT, traits, Allocator>& e, 
                         const std::basic_string<charT>& fmt,
                         unsigned int flags = match_default)
{
   return regex_merge(out, first, last, e, fmt.c_str(), flags);
}

template <class traits, class Allocator, class charT>
std::basic_string<charT> regex_merge(const std::basic_string<charT>& s,
                         const reg_expression<charT, traits, Allocator>& e, 
                         const charT* fmt,
                         unsigned int flags = match_default)
{
   std::basic_string<charT> result;
   re_detail::string_out_iterator<std::basic_string<charT> > i(result);
   regex_merge(i, s.begin(), s.end(), e, fmt, flags);
   return result;
}

template <class traits, class Allocator, class charT>
std::basic_string<charT> regex_merge(const std::basic_string<charT>& s,
                         const reg_expression<charT, traits, Allocator>& e, 
                         const std::basic_string<charT>& fmt,
                         unsigned int flags = match_default)
{
   std::basic_string<charT> result;
   re_detail::string_out_iterator<std::basic_string<charT> > i(result);
   regex_merge(i, s.begin(), s.end(), e, fmt.c_str(), flags);
   return result;
}

#ifdef __BORLANDC__
  #pragma option pop
#endif

} // namespace boost

#endif  // BOOST_REGEX_FORMAT_HPP