/*

 *

 * Copyright (c) 2004

 * 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         icu.hpp

  *   VERSION      see <boost/version.hpp>

  *   DESCRIPTION: Unicode regular expressions on top of the ICU Library.

  */

#ifndef BOOST_REGEX_ICU_HPP

#define BOOST_REGEX_ICU_HPP

#include <unicode/utypes.h>

#include <unicode/uchar.h>

#include <unicode/coll.h>

#include <boost/regex.hpp>

#include <boost/regex/pending/unicode_iterator.hpp>

#include <boost/mpl/int_fwd.hpp>

#include <bitset>

namespace boost{

namespace re_detail{

// 

// Implementation details:

//

class BOOST_REGEX_DECL icu_regex_traits_implementation

{

   typedef UChar32                      char_type;

   typedef std::size_t                  size_type;

   typedef std::vector<char_type>       string_type;

   typedef U_NAMESPACE_QUALIFIER Locale locale_type;

   typedef boost::uint_least32_t        char_class_type;

public:

   icu_regex_traits_implementation(const U_NAMESPACE_QUALIFIER Locale& l)

      : m_locale(l)

   {

      UErrorCode success = U_ZERO_ERROR;

      m_collator.reset(U_NAMESPACE_QUALIFIER Collator::createInstance(l, success));

      if(U_SUCCESS(success) == 0)

         init_error();

      m_collator->setStrength(U_NAMESPACE_QUALIFIER Collator::IDENTICAL);

      success = U_ZERO_ERROR;

      m_primary_collator.reset(U_NAMESPACE_QUALIFIER Collator::createInstance(l, success));

      if(U_SUCCESS(success) == 0)

         init_error();

      m_primary_collator->setStrength(U_NAMESPACE_QUALIFIER Collator::PRIMARY);

   }

   U_NAMESPACE_QUALIFIER Locale getloc()const

   {

      return m_locale;

   }

   string_type do_transform(const char_type* p1, const char_type* p2, const U_NAMESPACE_QUALIFIER Collator* pcoll) const;

   string_type transform(const char_type* p1, const char_type* p2) const

   {

      return do_transform(p1, p2, m_collator.get());

   }

   string_type transform_primary(const char_type* p1, const char_type* p2) const

   {

      return do_transform(p1, p2, m_primary_collator.get());

   }

private:

   void init_error()

   {

      std::runtime_error e("Could not initialize ICU resources");

      boost::throw_exception(e);

   }

   U_NAMESPACE_QUALIFIER Locale m_locale;                                  // The ICU locale that we're using

   boost::scoped_ptr< U_NAMESPACE_QUALIFIER Collator> m_collator;          // The full collation object

   boost::scoped_ptr< U_NAMESPACE_QUALIFIER Collator> m_primary_collator;  // The primary collation object

};

inline boost::shared_ptr<icu_regex_traits_implementation> get_icu_regex_traits_implementation(const U_NAMESPACE_QUALIFIER Locale& loc)

{

   return boost::shared_ptr<icu_regex_traits_implementation>(new icu_regex_traits_implementation(loc));

}

}

class BOOST_REGEX_DECL icu_regex_traits

{

public:

   typedef UChar32                      char_type;

   typedef std::size_t                  size_type;

   typedef std::vector<char_type>       string_type;

   typedef U_NAMESPACE_QUALIFIER Locale locale_type;

#ifdef BOOST_NO_INT64_T

   typedef std::bitset<64>              char_class_type;

#else

   typedef boost::uint64_t              char_class_type;

#endif

   struct boost_extensions_tag{};

   icu_regex_traits()

      : m_pimpl(re_detail::get_icu_regex_traits_implementation(U_NAMESPACE_QUALIFIER Locale()))

   {

   }

   static size_type length(const char_type* p);

   ::boost::regex_constants::syntax_type syntax_type(char_type c)const

   {

      return ((c < 0x7f) && (c > 0)) ? re_detail::get_default_syntax_type(static_cast<char>(c)) : regex_constants::syntax_char;

   }

   ::boost::regex_constants::escape_syntax_type escape_syntax_type(char_type c) const

   {

      return ((c < 0x7f) && (c > 0)) ? re_detail::get_default_escape_syntax_type(static_cast<char>(c)) : regex_constants::syntax_char;

   }

   char_type translate(char_type c) const

   {

      return c;

   }

   char_type translate_nocase(char_type c) const

   {

      return ::u_tolower(c);

   }

   char_type translate(char_type c, bool icase) const

   {

      return icase ? translate_nocase(c) : translate(c);

   }

   char_type tolower(char_type c) const

   {

      return ::u_tolower(c);

   }

   char_type toupper(char_type c) const

   {

      return ::u_toupper(c);

   }

   string_type transform(const char_type* p1, const char_type* p2) const

   {

      return m_pimpl->transform(p1, p2);

   }

   string_type transform_primary(const char_type* p1, const char_type* p2) const

   {

      return m_pimpl->transform_primary(p1, p2);

   }

   char_class_type lookup_classname(const char_type* p1, const char_type* p2) const;

   string_type lookup_collatename(const char_type* p1, const char_type* p2) const;

   bool isctype(char_type c, char_class_type f) const;

   int toi(const char_type*& p1, const char_type* p2, int radix)const

   {

      return re_detail::global_toi(p1, p2, radix, *this);

   }

   int value(char_type c, int radix)const

   {

      return u_digit(c, static_cast< ::int8_t>(radix));

   }

   locale_type imbue(locale_type l)

   {

      locale_type result(m_pimpl->getloc());

      m_pimpl = re_detail::get_icu_regex_traits_implementation(l);

      return result;

   }

   locale_type getloc()const

   {

      return locale_type();

   }

   std::string error_string(::boost::regex_constants::error_type n) const

   {

      return re_detail::get_default_error_string(n);

   }

private:

   icu_regex_traits(const icu_regex_traits&);

   icu_regex_traits& operator=(const icu_regex_traits&);

   //

   // define the bitmasks offsets we need for additional character properties:

   //

   enum{

      offset_blank = U_CHAR_CATEGORY_COUNT,

      offset_space = U_CHAR_CATEGORY_COUNT+1,

      offset_xdigit = U_CHAR_CATEGORY_COUNT+2,

      offset_underscore = U_CHAR_CATEGORY_COUNT+3,

      offset_unicode = U_CHAR_CATEGORY_COUNT+4,

      offset_any = U_CHAR_CATEGORY_COUNT+5,

      offset_ascii = U_CHAR_CATEGORY_COUNT+6

   };

   //

   // and now the masks:

   //

   static const char_class_type mask_blank;

   static const char_class_type mask_space;

   static const char_class_type mask_xdigit;

   static const char_class_type mask_underscore;

   static const char_class_type mask_unicode;

   static const char_class_type mask_any;

   static const char_class_type mask_ascii;

   static char_class_type lookup_icu_mask(const ::UChar32* p1, const ::UChar32* p2);

   boost::shared_ptr< ::boost::re_detail::icu_regex_traits_implementation> m_pimpl;

};

} // namespace boost

//

// template instances:

//

#define BOOST_REGEX_CHAR_T UChar32

#undef BOOST_REGEX_TRAITS_T

#define BOOST_REGEX_TRAITS_T , icu_regex_traits

#define BOOST_REGEX_ICU_INSTANCES

#ifdef BOOST_REGEX_ICU_INSTANTIATE

#  define BOOST_REGEX_INSTANTIATE

#endif

#include <boost/regex/v4/instances.hpp>

#undef BOOST_REGEX_CHAR_T

#undef BOOST_REGEX_TRAITS_T

#undef BOOST_REGEX_ICU_INSTANCES

#ifdef BOOST_REGEX_INSTANTIATE

#  undef BOOST_REGEX_INSTANTIATE

#endif

namespace boost{

// types:

typedef basic_regex< ::UChar32, icu_regex_traits> u32regex;

typedef match_results<const ::UChar32*> u32match;

typedef match_results<const ::UChar*> u16match;

//

// Construction of 32-bit regex types from UTF-8 and UTF-16 primitives:

//

namespace re_detail{

#if !defined(BOOST_NO_MEMBER_TEMPLATES) && !defined(__IBMCPP__)

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<1>*)

{

   typedef boost::u8_to_u32_iterator<InputIterator, UChar32> conv_type;

   return u32regex(conv_type(i), conv_type(j), opt);

}

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<2>*)

{

   typedef boost::u16_to_u32_iterator<InputIterator, UChar32> conv_type;

   return u32regex(conv_type(i), conv_type(j), opt);

}

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<4>*)

{

   return u32regex(i, j, opt);

}

#else

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<1>*)

{

   typedef boost::u8_to_u32_iterator<InputIterator, UChar32> conv_type;

   typedef std::vector<UChar32> vector_type;

   vector_type v;

   conv_type a(i), b(j);

   while(a != b)

   {

      v.push_back(*a);

      ++a;

   }

   if(v.size())

      return u32regex(&*v.begin(), v.size(), opt);

   return u32regex(static_cast<UChar32 const*>(0), static_cast<u32regex::size_type>(0), opt);

}

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<2>*)

{

   typedef boost::u16_to_u32_iterator<InputIterator, UChar32> conv_type;

   typedef std::vector<UChar32> vector_type;

   vector_type v;

   conv_type a(i), b(j);

   while(a != b)

   {

      v.push_back(*a);

      ++a;

   }

   if(v.size())

      return u32regex(&*v.begin(), v.size(), opt);

   return u32regex(static_cast<UChar32 const*>(0), static_cast<u32regex::size_type>(0), opt);

}

template <class InputIterator>

inline u32regex do_make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt, 

                              const boost::mpl::int_<4>*)

{

   typedef std::vector<UCHAR32> vector_type;

   vector_type v;

   while(i != j)

   {

      v.push_back((UCHAR32)(*i));

      ++a;

   }

   if(v.size())

      return u32regex(&*v.begin(), v.size(), opt);

   return u32regex(static_cast<UChar32 const*>(0), static_cast<u32regex::size_type>(0), opt);

}

#endif

}

//

// Construction from an iterator pair:

//

template <class InputIterator>

inline u32regex make_u32regex(InputIterator i, 

                              InputIterator j, 

                              boost::regex_constants::syntax_option_type opt)

{

   return re_detail::do_make_u32regex(i, j, opt, static_cast<boost::mpl::int_<sizeof(*i)> const*>(0));

}

//

// construction from UTF-8 nul-terminated strings:

//

inline u32regex make_u32regex(const char* p, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(p, p + std::strlen(p), opt, static_cast<boost::mpl::int_<1> const*>(0));

}

inline u32regex make_u32regex(const unsigned char* p, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(p, p + std::strlen(reinterpret_cast<const char*>(p)), opt, static_cast<boost::mpl::int_<1> const*>(0));

}

//

// construction from UTF-16 nul-terminated strings:

//

#ifndef BOOST_NO_WREGEX

inline u32regex make_u32regex(const wchar_t* p, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(p, p + std::wcslen(p), opt, static_cast<boost::mpl::int_<sizeof(wchar_t)> const*>(0));

}

#endif

#if !defined(U_WCHAR_IS_UTF16) && (U_SIZEOF_WCHAR_T != 2)

inline u32regex make_u32regex(const UChar* p, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(p, p + u_strlen(p), opt, static_cast<boost::mpl::int_<2> const*>(0));

}

#endif

//

// construction from basic_string class-template:

//

template<class C, class T, class A>

inline u32regex make_u32regex(const std::basic_string<C, T, A>& s, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(s.begin(), s.end(), opt, static_cast<boost::mpl::int_<sizeof(C)> const*>(0));

}

//

// Construction from ICU string type:

//

inline u32regex make_u32regex(const UnicodeString& s, boost::regex_constants::syntax_option_type opt = boost::regex_constants::perl)

{

   return re_detail::do_make_u32regex(s.getBuffer(), s.getBuffer() + s.length(), opt, static_cast<boost::mpl::int_<2> const*>(0));

}

//

// regex_match overloads that widen the character type as appropriate:

//

namespace re_detail{

template<class MR1, class MR2>

void copy_results(MR1& out, MR2 const& in)

{

   // copy results from an adapted MR2 match_results:

   out.set_size(in.size(), in.prefix().first.base(), in.suffix().second.base());

   out.set_base(in.base().base());

   for(int i = 0; i < (int)in.size(); ++i)

   {

      if(in[i].matched)

      {

         out.set_first(in[i].first.base(), i);

         out.set_second(in[i].second.base(), i);

      }

   }

}

template <class BidiIterator, class Allocator>

inline bool do_regex_match(BidiIterator first, BidiIterator last, 

                 match_results<BidiIterator, Allocator>& m, 

                 const u32regex& e, 

                 match_flag_type flags,

                 boost::mpl::int_<4> const*)

{

   return ::boost::regex_match(first, last, m, e, flags);

}

template <class BidiIterator, class Allocator>

bool do_regex_match(BidiIterator first, BidiIterator last, 

                 match_results<BidiIterator, Allocator>& m, 

                 const u32regex& e, 

                 match_flag_type flags,

                 boost::mpl::int_<2> const*)

{

   typedef u16_to_u32_iterator<BidiIterator, UChar32> conv_type;

   typedef match_results<conv_type>                   match_type;

   typedef typename match_type::allocator_type        alloc_type;

   match_type what;

   bool result = ::boost::regex_match(conv_type(first), conv_type(last), what, e, flags);

   // copy results across to m:

   if(result) copy_results(m, what);

   return result;

}

template <class BidiIterator, class Allocator>

bool do_regex_match(BidiIterator first, BidiIterator last, 

                 match_results<BidiIterator, Allocator>& m, 

                 const u32regex& e, 

                 match_flag_type flags,

                 boost::mpl::int_<1> const*)

{

   typedef u8_to_u32_iterator<BidiIterator, UChar32>  conv_type;

   typedef match_results<conv_type>                   match_type;

   typedef typename match_type::allocator_type        alloc_type;

   match_type what;

   bool result = ::boost::regex_match(conv_type(first), conv_type(last), what, e, flags);

   // copy results across to m:

   if(result) copy_results(m, what);

   return result;

}

} // namespace re_detail

template <class BidiIterator, class Allocator>

inline bool u32regex_match(BidiIterator first, BidiIterator last, 

                 match_results<BidiIterator, Allocator>& m, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(first, last, m, e, flags, static_cast<mpl::int_<sizeof(*first)> const*>(0));

}

inline bool u32regex_match(const UChar* p, 

                 match_results<const UChar*>& m, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(p, p+u_strlen(p), m, e, flags, static_cast<mpl::int_<2> const*>(0));

}

#if !defined(U_WCHAR_IS_UTF16) && (U_SIZEOF_WCHAR_T != 2) && !defined(BOOST_NO_WREGEX)

inline bool u32regex_match(const wchar_t* p, 

                 match_results<const wchar_t*>& m, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(p, p+std::wcslen(p), m, e, flags, static_cast<mpl::int_<sizeof(wchar_t)> const*>(0));

}

#endif

inline bool u32regex_match(const char* p, 

                 match_results<const char*>& m, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(p, p+std::strlen(p), m, e, flags, static_cast<mpl::int_<1> const*>(0));

}

inline bool u32regex_match(const unsigned char* p, 

                 match_results<const unsigned char*>& m, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(p, p+std::strlen((const char*)p), m, e, flags, static_cast<mpl::int_<1> const*>(0));

}

inline bool u32regex_match(const std::string& s, 

                        match_results<std::string::const_iterator>& m, 

                        const u32regex& e, 

                        match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(s.begin(), s.end(), m, e, flags, static_cast<mpl::int_<1> const*>(0));

}

#ifndef BOOST_NO_STD_WSTRING

inline bool u32regex_match(const std::wstring& s, 

                        match_results<std::wstring::const_iterator>& m, 

                        const u32regex& e, 

                        match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(s.begin(), s.end(), m, e, flags, static_cast<mpl::int_<sizeof(wchar_t)> const*>(0));

}

#endif

inline bool u32regex_match(const UnicodeString& s, 

                        match_results<const UChar*>& m, 

                        const u32regex& e, 

                        match_flag_type flags = match_default)

{

   return re_detail::do_regex_match(s.getBuffer(), s.getBuffer() + s.length(), m, e, flags, static_cast<mpl::int_<sizeof(wchar_t)> const*>(0));

}

//

// regex_match overloads that do not return what matched:

//

template <class BidiIterator>

inline bool u32regex_match(BidiIterator first, BidiIterator last, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   match_results<BidiIterator> m;

   return re_detail::do_regex_match(first, last, m, e, flags, static_cast<mpl::int_<sizeof(*first)> const*>(0));

}

inline bool u32regex_match(const UChar* p, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   match_results<const UChar*> m;

   return re_detail::do_regex_match(p, p+u_strlen(p), m, e, flags, static_cast<mpl::int_<2> const*>(0));

}

#if !defined(U_WCHAR_IS_UTF16) && (U_SIZEOF_WCHAR_T != 2) && !defined(BOOST_NO_WREGEX)

inline bool u32regex_match(const wchar_t* p, 

                 const u32regex& e, 

                 match_flag_type flags = match_default)

{

   match_results<const wchar_t*> m;

   return re_detail::do_regex_match(p, p+std::wcslen(p), m, e, flags, static_cast<mpl::int_<sizeof(wchar_t)> const*>(0));

}