/*

 *

 * Copyright (c) 2003

 * John Maddock

 *

 * Use, modification and distribution are subject to the 

 * Boost Software License, Version 1.0. (See accompanying file 

 * LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

 *

 */

 /*

  *   LOCATION:    see http://www.boost.org for most recent version.

  *   FILE         regex_iterator.hpp

  *   VERSION      see <boost/version.hpp>

  *   DESCRIPTION: Provides regex_iterator implementation.

  */

#ifndef BOOST_REGEX_V4_REGEX_ITERATOR_HPP

#define BOOST_REGEX_V4_REGEX_ITERATOR_HPP

#include <boost/shared_ptr.hpp>

namespace boost{

#ifdef BOOST_MSVC

#pragma warning(push)

#pragma warning(disable: 4103)

#endif

#ifdef BOOST_HAS_ABI_HEADERS

#  include BOOST_ABI_PREFIX

#endif

#ifdef BOOST_MSVC

#pragma warning(pop)

#endif

template <class BidirectionalIterator, 

          class charT,

          class traits>

class regex_iterator_implementation 

{

   typedef basic_regex<charT, traits> regex_type;

   match_results<BidirectionalIterator> what;  // current match

   BidirectionalIterator                base;  // start of sequence

   BidirectionalIterator                end;   // end of sequence

   const regex_type                     re;   // the expression

   match_flag_type                      flags; // flags for matching

public:

   regex_iterator_implementation(const regex_type* p, BidirectionalIterator last, match_flag_type f)

      : base(), end(last), re(*p), flags(f){}

   bool init(BidirectionalIterator first)

   {

      base = first;

      return regex_search(first, end, what, re, flags);

   }

   bool compare(const regex_iterator_implementation& that)

   {

      if(this == &that) return true;

      return (&re.get_data() == &that.re.get_data()) && (end == that.end) && (flags == that.flags) && (what[0].first == that.what[0].first) && (what[0].second == that.what[0].second);

   }

   const match_results<BidirectionalIterator>& get()

   { return what; }

   bool next()

   {

      //if(what.prefix().first != what[0].second)

      //   flags |= match_prev_avail;

      BidirectionalIterator next_start = what[0].second;

      match_flag_type f(flags);

      if(!what.length())

         f |= regex_constants::match_not_initial_null;

      //if(base != next_start)

      //   f |= regex_constants::match_not_bob;

      bool result = regex_search(next_start, end, what, re, f, base);

      if(result)

         what.set_base(base);

      return result;

   }

private:

   regex_iterator_implementation& operator=(const regex_iterator_implementation&);

};

template <class BidirectionalIterator, 

          class charT = BOOST_DEDUCED_TYPENAME re_detail::regex_iterator_traits<BidirectionalIterator>::value_type,

          class traits = regex_traits<charT> >

class regex_iterator 

#ifndef BOOST_NO_STD_ITERATOR

   : public std::iterator<

         std::forward_iterator_tag, 

         match_results<BidirectionalIterator>,

         typename re_detail::regex_iterator_traits<BidirectionalIterator>::difference_type,

         const match_results<BidirectionalIterator>*,

         const match_results<BidirectionalIterator>& >         

#endif

{

private:

   typedef regex_iterator_implementation<BidirectionalIterator, charT, traits> impl;

   typedef shared_ptr<impl> pimpl;

public:

   typedef          basic_regex<charT, traits>                   regex_type;

   typedef          match_results<BidirectionalIterator>                    value_type;

   typedef typename re_detail::regex_iterator_traits<BidirectionalIterator>::difference_type 

                                                                            difference_type;

   typedef          const value_type*                                       pointer;

   typedef          const value_type&                                       reference; 

   typedef          std::forward_iterator_tag                               iterator_category;

   regex_iterator(){}

   regex_iterator(BidirectionalIterator a, BidirectionalIterator b, 

                  const regex_type& re, 

                  match_flag_type m = match_default)

                  : pdata(new impl(&re, b, m))

   {

      if(!pdata->init(a))

      {

         pdata.reset();

      }

   }

   regex_iterator(const regex_iterator& that)

      : pdata(that.pdata) {}

   regex_iterator& operator=(const regex_iterator& that)

   {

      pdata = that.pdata;

      return *this;

   }

   bool operator==(const regex_iterator& that)const

   { 

      if((pdata.get() == 0) || (that.pdata.get() == 0))

         return pdata.get() == that.pdata.get();

      return pdata->compare(*(that.pdata.get())); 

   }

   bool operator!=(const regex_iterator& that)const

   { return !(*this == that); }

   const value_type& operator*()const

   { return pdata->get(); }

   const value_type* operator->()const

   { return &(pdata->get()); }

   regex_iterator& operator++()

   {

      cow();

      if(0 == pdata->next())

      {

         pdata.reset();

      }

      return *this;

   }

   regex_iterator operator++(int)

   {

      regex_iterator result(*this);

      ++(*this);

      return result;

   }

private:

   pimpl pdata;

   void cow()

   {

      // copy-on-write

      if(pdata.get() && !pdata.unique())

      {

         pdata.reset(new impl(*(pdata.get())));

      }

   }

};

typedef regex_iterator<const char*> cregex_iterator;

typedef regex_iterator<std::string::const_iterator> sregex_iterator;

#ifndef BOOST_NO_WREGEX

typedef regex_iterator<const wchar_t*> wcregex_iterator;

typedef regex_iterator<std::wstring::const_iterator> wsregex_iterator;

#endif

// make_regex_iterator:

template <class charT, class traits>

inline regex_iterator<const charT*, charT, traits> make_regex_iterator(const charT* p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)

{

   return regex_iterator<const charT*, charT, traits>(p, p+traits::length(p), e, m);

}

template <class charT, class traits, class ST, class SA>

inline regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits> make_regex_iterator(const std::basic_string<charT, ST, SA>& p, const basic_regex<charT, traits>& e, regex_constants::match_flag_type m = regex_constants::match_default)

{

   return regex_iterator<typename std::basic_string<charT, ST, SA>::const_iterator, charT, traits>(p.begin(), p.end(), e, m);

}

#ifdef BOOST_MSVC

#pragma warning(push)

#pragma warning(disable: 4103)

#endif

#ifdef BOOST_HAS_ABI_HEADERS

#  include BOOST_ABI_SUFFIX

#endif

#ifdef BOOST_MSVC

#pragma warning(pop)

#endif

} // namespace boost

#endif // BOOST_REGEX_V4_REGEX_ITERATOR_HPP