regex_traits_defaults.hpp

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/*
 *
 * 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         regex_traits_defaults.hpp
  *   VERSION      see <boost/version.hpp>
  *   DESCRIPTION: Declares API's for access to regex_traits default properties.
  */

#ifndef BOOST_REGEX_TRAITS_DEFAULTS_HPP_INCLUDED
#define BOOST_REGEX_TRAITS_DEFAULTS_HPP_INCLUDED

#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

#ifndef BOOST_REGEX_SYNTAX_TYPE_HPP
#include <boost/regex/v4/syntax_type.hpp>
#endif
#ifndef BOOST_REGEX_ERROR_TYPE_HPP
#include <boost/regex/v4/error_type.hpp>
#endif

#ifdef BOOST_NO_STDC_NAMESPACE
namespace std{
   using ::strlen;
}
#endif

namespace boost{ namespace re_detail{


//
// helpers to suppress warnings:
//
template <class charT>
inline bool is_extended(charT c)
{ return c > 256; }
inline bool is_extended(char)
{ return false; }


BOOST_REGEX_DECL const char* BOOST_REGEX_CALL get_default_syntax(regex_constants::syntax_type n);
BOOST_REGEX_DECL const char* BOOST_REGEX_CALL get_default_error_string(regex_constants::error_type n);
BOOST_REGEX_DECL regex_constants::syntax_type BOOST_REGEX_CALL get_default_syntax_type(char c);
BOOST_REGEX_DECL regex_constants::escape_syntax_type BOOST_REGEX_CALL get_default_escape_syntax_type(char c);

// is charT c a combining character?
BOOST_REGEX_DECL bool BOOST_REGEX_CALL is_combining_implementation(uint_least16_t s);

template <class charT>
inline bool is_combining(charT c)
{
   return (c <= static_cast<charT>(0)) ? false : ((c >= static_cast<charT>((std::numeric_limits<uint_least16_t>::max)())) ? false : is_combining_implementation(static_cast<unsigned short>(c)));
}
template <>
inline bool is_combining<char>(char)
{
   return false;
}
template <>
inline bool is_combining<signed char>(signed char)
{
   return false;
}
template <>
inline bool is_combining<unsigned char>(unsigned char)
{
   return false;
}
#ifndef __hpux // can't use WCHAR_MAX/MIN in pp-directives
#ifdef _MSC_VER 
template<>
inline bool is_combining<wchar_t>(wchar_t c)
{
   return is_combining_implementation(static_cast<unsigned short>(c));
}
#elif !defined(__DECCXX) && !defined(__osf__) && !defined(__OSF__) && defined(WCHAR_MIN) && (WCHAR_MIN == 0) && !defined(BOOST_NO_INTRINSIC_WCHAR_T)
#if defined(WCHAR_MAX) && (WCHAR_MAX <= USHRT_MAX)
template<>
inline bool is_combining<wchar_t>(wchar_t c)
{
   return is_combining_implementation(static_cast<unsigned short>(c));
}
#else
template<>
inline bool is_combining<wchar_t>(wchar_t c)
{
   return (c >= (std::numeric_limits<uint_least16_t>::max)()) ? false : is_combining_implementation(static_cast<unsigned short>(c));
}
#endif
#endif
#endif

//
// is a charT c a line separator?
//
template <class charT>
inline bool is_separator(charT c)
{
   return BOOST_REGEX_MAKE_BOOL(
      (c == static_cast<charT>('\n')) 
      || (c == static_cast<charT>('\r')) 
      || (c == static_cast<charT>('\f')) 
      || (static_cast<boost::uint16_t>(c) == 0x2028u) 
      || (static_cast<boost::uint16_t>(c) == 0x2029u) 
      || (static_cast<boost::uint16_t>(c) == 0x85u));
}
template <>
inline bool is_separator<char>(char c)
{
   return BOOST_REGEX_MAKE_BOOL((c == '\n') || (c == '\r') || (c == '\f'));
}

//
// get a default collating element:
//
BOOST_REGEX_DECL std::string BOOST_REGEX_CALL lookup_default_collate_name(const std::string& name);

//
// get the state_id of a character clasification, the individual
// traits classes then transform that state_id into a bitmask:
//
template <class charT>
struct character_pointer_range
{
   const charT* p1;
   const charT* p2;

   bool operator < (const character_pointer_range& r)const
   {
      return std::lexicographical_compare(p1, p2, r.p1, r.p2);
   }
   bool operator == (const character_pointer_range& r)const
   {
      // Not only do we check that the ranges are of equal size before
      // calling std::equal, but there is no other algorithm available:
      // not even a non-standard MS one.  So forward to unchecked_equal
      // in the MS case.
      return ((p2 - p1) == (r.p2 - r.p1)) && re_detail::equal(p1, p2, r.p1);
   }
};
template <class charT>
int get_default_class_id(const charT* p1, const charT* p2)
{
   static const charT data[72] = {
      'a', 'l', 'n', 'u', 'm',
      'a', 'l', 'p', 'h', 'a',
      'b', 'l', 'a', 'n', 'k',
      'c', 'n', 't', 'r', 'l',
      'd', 'i', 'g', 'i', 't',
      'g', 'r', 'a', 'p', 'h',
      'l', 'o', 'w', 'e', 'r',
      'p', 'r', 'i', 'n', 't',
      'p', 'u', 'n', 'c', 't',
      's', 'p', 'a', 'c', 'e',
      'u', 'n', 'i', 'c', 'o', 'd', 'e',
      'u', 'p', 'p', 'e', 'r',
      'w', 'o', 'r', 'd',
      'x', 'd', 'i', 'g', 'i', 't',
   };

   static const character_pointer_range<charT> ranges[19] = 
   {
      {data+0, data+5,}, // alnum
      {data+5, data+10,}, // alpha
      {data+10, data+15,}, // blank
      {data+15, data+20,}, // cntrl
      {data+20, data+21,}, // d
      {data+20, data+25,}, // digit
      {data+25, data+30,}, // graph
      {data+30, data+31,}, // l
      {data+30, data+35,}, // lower
      {data+35, data+40,}, // print
      {data+40, data+45,}, // punct
      {data+45, data+46,}, // s
      {data+45, data+50,}, // space
      {data+57, data+58,}, // u
      {data+50, data+57,}, // unicode
      {data+57, data+62,}, // upper
      {data+62, data+63,}, // w
      {data+62, data+66,}, // word
      {data+66, data+72,}, // xdigit
   };
   static const character_pointer_range<charT>* ranges_begin = ranges;
   static const character_pointer_range<charT>* ranges_end = ranges + (sizeof(ranges)/sizeof(ranges[0]));
   
   character_pointer_range<charT> t = { p1, p2, };
   const character_pointer_range<charT>* p = std::lower_bound(ranges_begin, ranges_end, t);
   if((p != ranges_end) && (t == *p))
      return static_cast<int>(p - ranges);
   return -1;
}

//
// helper functions:
//
template <class charT>
std::ptrdiff_t global_length(const charT* p)
{
   std::ptrdiff_t n = 0;
   while(*p)
   {
      ++p;
      ++n;
   }
   return n;
}
template<>
inline std::ptrdiff_t global_length<char>(const char* p)
{
   return (std::strlen)(p);
}
#ifndef BOOST_NO_WREGEX
template<>
inline std::ptrdiff_t global_length<wchar_t>(const wchar_t* p)
{
   return (std::wcslen)(p);
}
#endif
template <class charT>
inline charT BOOST_REGEX_CALL global_lower(charT c)
{
   return c;
}
template <class charT>
inline charT BOOST_REGEX_CALL global_upper(charT c)
{
   return c;
}

BOOST_REGEX_DECL char BOOST_REGEX_CALL do_global_lower(char c);
BOOST_REGEX_DECL char BOOST_REGEX_CALL do_global_upper(char c);
#ifndef BOOST_NO_WREGEX
BOOST_REGEX_DECL wchar_t BOOST_REGEX_CALL do_global_lower(wchar_t c);
BOOST_REGEX_DECL wchar_t BOOST_REGEX_CALL do_global_upper(wchar_t c);
#endif
#ifdef BOOST_REGEX_HAS_OTHER_WCHAR_T
BOOST_REGEX_DECL unsigned short BOOST_REGEX_CALL do_global_lower(unsigned short c);
BOOST_REGEX_DECL unsigned short BOOST_REGEX_CALL do_global_upper(unsigned short c);
#endif
//
// This sucks: declare template specialisations of global_lower/global_upper
// that just forward to the non-template implementation functions.  We do
// this because there is one compiler (Compaq Tru64 C++) that doesn't seem
// to differentiate between templates and non-template overloads....
// what's more, the primary template, plus all overloads have to be
// defined in the same translation unit (if one is inline they all must be)
// otherwise the "local template instantiation" compiler option can pick
// the wrong instantiation when linking:
//
template<> inline char BOOST_REGEX_CALL global_lower<char>(char c){ return do_global_lower(c); }
template<> inline char BOOST_REGEX_CALL global_upper<char>(char c){ return do_global_upper(c); }
#ifndef BOOST_NO_WREGEX
template<> inline wchar_t BOOST_REGEX_CALL global_lower<wchar_t>(wchar_t c){ return do_global_lower(c); }
template<> inline wchar_t BOOST_REGEX_CALL global_upper<wchar_t>(wchar_t c){ return do_global_upper(c); }
#endif
#ifdef BOOST_REGEX_HAS_OTHER_WCHAR_T
template<> inline unsigned short BOOST_REGEX_CALL global_lower<unsigned short>(unsigned short c){ return do_global_lower(c); }
template<> inline unsigned short BOOST_REGEX_CALL global_upper<unsigned short>(unsigned short c){ return do_global_upper(c); }
#endif

template <class charT>
int global_value(charT c)
{
   static const charT zero = '0';
   static const charT nine = '9';
   static const charT a = 'a';
   static const charT f = 'f';
   static const charT A = 'A';
   static const charT F = 'F';

   if(c > f) return -1;
   if(c >= a) return 10 + (c - a);
   if(c > F) return -1;
   if(c >= A) return 10 + (c - A);
   if(c > nine) return -1;
   if(c >= zero) return c - zero;
   return -1;
}
template <class charT, class traits>
int global_toi(const charT*& p1, const charT* p2, int radix, const traits& t)
{
   (void)t; // warning suppression
   int next_value = t.value(*p1, radix);
   if((p1 == p2) || (next_value < 0) || (next_value >= radix))
      return -1;
   int result = 0;
   while(p1 != p2)
   {
      next_value = t.value(*p1, radix);
      if((next_value < 0) || (next_value >= radix))
         break;
      result *= radix;
      result += next_value;
      ++p1;
   }
   return result;
}

} // re_detail
} // boost

#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

#endif