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// -*- C++ -*-

// Testing character type and state type with char_traits and codecvt

// specializations for the C++ library testsuite.

//

// Copyright (C) 2003, 2004, 2005, 2006, 2007, 2008, 2009

// Free Software Foundation, Inc.

//

// This file is part of the GNU ISO C++ Library.  This library is free

// software; you can redistribute it and/or modify it under the

// terms of the GNU General Public License as published by the

// Free Software Foundation; either version 3, or (at your option)

// any later version.

//

// This library is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License along

// with this library; see the file COPYING3.  If not see

// <http://www.gnu.org/licenses/>.

//

#ifndef _GLIBCXX_TESTSUITE_CHARACTER_H

#define _GLIBCXX_TESTSUITE_CHARACTER_H

#include <climits>

#include <string> // for char_traits

#include <locale> // for codecvt

#include <algorithm> // for transform

#include <ext/pod_char_traits.h>

namespace __gnu_test

{

  struct pod_int

  {

    int value;

#ifdef __GXX_EXPERIMENTAL_CXX0X__

    // For std::iota.

    pod_int&

    operator++()

    {

      ++value;

      return *this;

    }

#endif

  };

  // For 20.1 requirements for instantiable type: equality comparable

  // and less than comparable.

  inline bool

  operator==(const pod_int& lhs, const pod_int& rhs)

  { return lhs.value == rhs.value; }

  inline bool

  operator<(const pod_int& lhs, const pod_int& rhs)

  { return lhs.value < rhs.value; }

  // For 26 numeric algorithms requirements, need addable,

  // subtractable, multiplicable.

  inline pod_int

  operator+(const pod_int& lhs, const pod_int& rhs)

  {

    pod_int ret = { lhs.value + rhs.value };

    return ret;

  }

  inline pod_int

  operator-(const pod_int& lhs, const pod_int& rhs)

  {

    pod_int ret = { lhs.value - rhs.value };

    return ret;

  }

  inline pod_int

  operator*(const pod_int& lhs, const pod_int& rhs)

  {

    pod_int ret = { lhs.value * rhs.value };

    return ret;

  }

  struct pod_state

  {

    unsigned long value;

  };

  inline bool

  operator==(const pod_state& lhs, const pod_state& rhs)

  { return lhs.value == rhs.value; }

  inline bool

  operator<(const pod_state& lhs, const pod_state& rhs)

  { return lhs.value < rhs.value; }

  // Alternate character types.

  using __gnu_cxx::character;

  typedef character<unsigned char, pod_int, pod_state>          pod_char;

  typedef character<unsigned char, unsigned int, pod_state>     pod_uchar;

  typedef character<unsigned short, unsigned int>               pod_ushort;

  typedef character<unsigned int, unsigned long>                pod_uint;

}

namespace __gnu_cxx

{

  // Specializations.

  // pod_char

  template<>

    template<typename V2>

      inline __gnu_test::pod_char::char_type

      __gnu_test::pod_char::char_type::from(const V2& v)

      {

        char_type ret = { static_cast<value_type>(v.value) };

        return ret;

      }

  template<>

    template<typename V2>

      inline V2

      __gnu_test::pod_char::char_type::to(const char_type& c)

      {

        V2 ret = { c.value };

        return ret;

      }

  template<>

    template<typename V2>

      inline __gnu_test::pod_uchar::char_type

      __gnu_test::pod_uchar::char_type::from(const V2& v)

      {

        char_type ret;

        ret.value = (v >> 5);

        return ret;

      }

  template<>

    template<typename V2>

      inline V2

      __gnu_test::pod_uchar::char_type::to(const char_type& c)

      { return static_cast<V2>(c.value << 5); }

} // namespace __gnu_test

namespace std

{

  // codecvt specialization

  //

  // The conversion performed by the specialization is not supposed to

  // be useful, rather it has been designed to demonstrate the

  // essential features of stateful conversions:

  // * Number and value of bytes for each internal character depends on the

  //   state in addition to the character itself.

  // * Unshift produces an unshift sequence and resets the state. On input

  //   the unshift sequence causes the state to be reset.

  //

  // The conversion for output is as follows:

  // 1. Calculate the value tmp by xor-ing the state and the internal

  //    character

  // 2. Split tmp into either two or three bytes depending on the value of

  //    state. Output those bytes.

  // 3. tmp becomes the new value of state.

  template<>

    class codecvt<__gnu_test::pod_uchar, char, __gnu_test::pod_state>

    : public __codecvt_abstract_base<__gnu_test::pod_uchar, char,

                                     __gnu_test::pod_state>

    {

    public:

      typedef codecvt_base::result      result;

      typedef __gnu_test::pod_uchar     intern_type;

      typedef char                      extern_type;

      typedef __gnu_test::pod_state     state_type;

      typedef __codecvt_abstract_base<intern_type, extern_type, state_type>

      base_type;

      explicit codecvt(size_t refs = 0) : base_type(refs)

      { }

      static locale::id id;

    protected:

      ~codecvt()

      { }

      virtual result

      do_out(state_type& state, const intern_type* from,

             const intern_type* from_end, const intern_type*& from_next,

             extern_type* to, extern_type* to_limit,

             extern_type*& to_next) const

      {

        while (from < from_end && to < to_limit)

          {

            unsigned char tmp = (state.value ^ from->value);

            if (state.value & 0x8)

              {

                if (to >= to_limit - 2)

                  break;

                *to++ = (tmp & 0x7);

                *to++ = ((tmp >> 3) & 0x7);

                *to++ = ((tmp >> 6) & 0x3);

              }

            else

              {

                if (to >= to_limit - 1)

                  break;

                *to++ = (tmp & 0xf);

                *to++ = ((tmp >> 4) & 0xf);

              }

            state.value = tmp;

            ++from;

          }

        from_next = from;

        to_next = to;

        return (from < from_end) ? partial : ok;

      }

      virtual result

      do_in(state_type& state, const extern_type* from,

            const extern_type* from_end, const extern_type*& from_next,

            intern_type* to, intern_type* to_limit,

            intern_type*& to_next) const

      {

        while (from < from_end && to < to_limit)

          {

            unsigned char c = *from;

            if (c & 0xc0)

              {

                // Unshift sequence

                state.value &= c;

                ++from;

                continue;

              }

            unsigned char tmp;

            if (state.value & 0x8)

              {

                if (from >= from_end - 2)

                  break;

                tmp = (*from++ & 0x7);

                tmp |= ((*from++ << 3) & 0x38);

                tmp |= ((*from++ << 6) & 0xc0);

              }

            else

              {

                if (from >= from_end - 1)

                  break;

                tmp = (*from++ & 0xf);

                tmp |= ((*from++ << 4) & 0xf0);

              }

            to->value = (tmp ^ state.value);

            state.value = tmp;

            ++to;

          }

        from_next = from;

        to_next = to;

        return (from < from_end) ? partial : ok;

      }

      virtual result

      do_unshift(state_type& state, extern_type* to, extern_type* to_limit,

                 extern_type*& to_next) const

      {

        for (unsigned int i = 0; i < CHAR_BIT; ++i)

          {

            unsigned int mask = (1 << i);

            if (state.value & mask)

              {

                if (to == to_limit)

                  {

                    to_next = to;

                    return partial;

                  }

                state.value &= ~mask;

                *to++ = static_cast<unsigned char>(~mask);

              }

          }

        to_next = to;

        return state.value == 0 ? ok : error;

      }

      virtual int

      do_encoding() const throw()

      { return -1; }

      virtual bool

      do_always_noconv() const throw()

      { return false; }

      virtual int

      do_length(state_type& state, const extern_type* from,

                const extern_type* end, size_t max) const

      {

        const extern_type* beg = from;

        while (from < end)

          {

            unsigned char c = *from;

            if (c & 0xc0)

              {

                // Unshift sequence

                state.value &= c;

                ++from;

                continue;

              }

            if (max == 0) break;

            unsigned char tmp;

            if (state.value & 0x8)

              {

                if (from >= end - 2)

                  break;

                tmp = (*from++ & 0x7);

                tmp |= ((*from++ << 3) & 0x38);

                tmp |= ((*from++ << 6) & 0xc0);

              }

            else

              {

                if (from >= end - 1)

                  break;

                tmp = (*from++ & 0xf);

                tmp |= ((*from++ << 4) & 0xf0);

              }

            state.value = tmp;

            --max;

          }

        return from - beg;

      }

      // Maximum 8 bytes unshift sequence followed by max 3 bytes for

      // one character.

      virtual int

      do_max_length() const throw()

      { return 11; }

    };

  template<>

    class ctype<__gnu_test::pod_uchar>

    : public __ctype_abstract_base<__gnu_test::pod_uchar>

    {

    public:

      typedef __gnu_test::pod_uchar char_type;

      explicit ctype(size_t refs  = 0)

      : __ctype_abstract_base<__gnu_test::pod_uchar>(refs) { }

      static locale::id id;

    protected:

      ~ctype()

      { }

      virtual bool

      do_is(mask, char_type) const

      { return false; }

      virtual const char_type*

      do_is(const char_type* low, const char_type* high, mask* vec) const

      {

        fill_n(vec, high - low, mask());

        return high;

      }

      virtual const char_type*

      do_scan_is(mask, const char_type*, const char_type* high) const

      { return high; }

      virtual const char_type*

      do_scan_not(mask, const char_type* low, const char_type*) const

      { return low; }

      virtual char_type

      do_toupper(char_type c) const

      { return c; }

      virtual const char_type*

      do_toupper(char_type*, const char_type*  high) const

      { return high; }

      virtual char_type

      do_tolower(char_type c) const

      { return c; }

      virtual const char_type*

      do_tolower(char_type*, const char_type*  high) const

      { return high; }

      virtual char_type

      do_widen(char c) const

      { return __gnu_test::pod_uchar::from<char>(c); }

      virtual const char*

      do_widen(const char* low, const char* high, char_type* dest) const

      {

        transform(low, high, dest, &__gnu_test::pod_uchar::from<char>);

        return high;

      }

      virtual char

      do_narrow(char_type, char dfault) const

      { return dfault; }

      virtual const char_type*

      do_narrow(const char_type* low, const char_type* high,

                char dfault, char*  dest) const

      {

        fill_n(dest, high - low, dfault);

        return high;

      }

    };

  // numpunct specializations

  template<>

    class numpunct<__gnu_test::pod_uint>

    : public locale::facet

    {

    public:

      typedef __gnu_test::pod_uint    char_type;

      typedef basic_string<char_type> string_type;

      static locale::id id;

      explicit

      numpunct(size_t refs = 0)

      : locale::facet(refs)

      { }

      char_type

      decimal_point() const

      { return this->do_decimal_point(); }

      char_type

      thousands_sep() const

      { return this->do_thousands_sep(); }

      string

      grouping() const

      { return this->do_grouping(); }

      string_type

      truename() const

      { return this->do_truename(); }

      string_type

      falsename() const

      { return this->do_falsename(); }

    protected:

      ~numpunct()

      { }

      virtual char_type

      do_decimal_point() const

      { return char_type(); }

      virtual char_type

      do_thousands_sep() const

      { return char_type(); }

      virtual string

      do_grouping() const

      { return string(); }

      virtual string_type

      do_truename() const

      { return string_type(); }

      virtual string_type

      do_falsename() const

      { return string_type(); }

    };

  template<>

    class moneypunct<__gnu_test::pod_uint>

    : public locale::facet, public money_base

    {

    public:

      typedef __gnu_test::pod_uint    char_type;

      typedef basic_string<char_type> string_type;

      static locale::id id;

      static const bool intl = false;

      explicit

      moneypunct(size_t refs = 0)

      : locale::facet(refs)

      { }

      char_type

      decimal_point() const

      { return this->do_decimal_point(); }

      char_type

      thousands_sep() const

      { return this->do_thousands_sep(); }

      string

      grouping() const

      { return this->do_grouping(); }

      string_type

      curr_symbol() const

      { return this->do_curr_symbol(); }

      string_type

      positive_sign() const

      { return this->do_positive_sign(); }

      string_type

      negative_sign() const

      { return this->do_negative_sign(); }

      int

      frac_digits() const

      { return this->do_frac_digits(); }

      pattern

      pos_format() const

      { return this->do_pos_format(); }

      pattern

      neg_format() const

      { return this->do_neg_format(); }

    protected:

      ~moneypunct()

      { }

      virtual char_type

      do_decimal_point() const

      { return char_type(); }

      virtual char_type

      do_thousands_sep() const

      { return char_type(); }

      virtual string

      do_grouping() const

      { return string(); }

      virtual string_type

      do_curr_symbol() const

      { return string_type(); }

      string_type

      do_positive_sign() const

      { return string_type(); }

      string_type

      do_negative_sign() const

      { return string_type(); }

      int

      do_frac_digits() const

      { return 0; }

      pattern

      do_pos_format() const

      { return pattern(); }

      pattern

      do_neg_format() const

      { return pattern(); }

     };

} // namespace std

#endif // _GLIBCXX_TESTSUITE_CHARACTER_H