/* Test locale support in C++ functions.

Copyright 2001, 2002, 2003 Free Software Foundation, Inc.

This file is part of the GNU MP Library.

The GNU MP Library is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 of the License, or (at your
option) any later version.

The GNU MP 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 Lesser General Public
License for more details.

You should have received a copy of the GNU Lesser General Public License
along with the GNU MP Library; see the file COPYING.LIB.  If not, write to
the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
MA 02110-1301, USA. */

#include <clocale>
#include <iostream>

#include "gmp.h"
#include "gmp-impl.h"
#include "tests.h"

using namespace std;


char point_string[2];

#if HAVE_STD__LOCALE
// Like std::numpunct, but with decimal_point coming from point_string[].
class my_numpunct : public numpunct<char> {
 public:
  explicit my_numpunct (size_t r = 0) : numpunct<char>(r) { }
 protected:
  char do_decimal_point() const { return point_string[0]; }
};
#endif

void
set_point (char c)
{
  point_string[0] = c;

#if HAVE_STD__LOCALE
  locale loc (locale::classic(), new my_numpunct ());
  locale::global (loc);
#endif
}


void
check_input (void)
{
  static const struct {
    const char  *str1;
    const char  *str2;
    double      want;
  } data[] = {

    { "1","",   1.0 },
    { "1","0",  1.0 },
    { "1","00", 1.0 },

    { "","5",    0.5 },
    { "0","5",   0.5 },
    { "00","5",  0.5 },
    { "00","50", 0.5 },

    { "1","5",    1.5 },
    { "1","5e1", 15.0 },
  };

  static char point[] = {
    '.', ',', 'x', '\xFF'
  };

  mpf_t  got;
  mpf_init (got);

  for (size_t i = 0; i < numberof (point); i++)
    {
      set_point (point[i]);

      for (int neg = 0; neg <= 1; neg++)
        {
          for (size_t j = 0; j < numberof (data); j++)
            {
              string str = string(data[j].str1)+point[i]+string(data[j].str2);
              if (neg)
                str = "-" + str;

              istringstream is (str.c_str());

              mpf_set_ui (got, 123);   // dummy initial value

              if (! (is >> got))
                {
                  cout << "istream mpf_t operator>> error\n";
                  cout << "  point " << point[i] << "\n";
                  cout << "  str   \"" << str << "\"\n";
                  cout << "  localeconv point \""
                       << localeconv()->decimal_point << "\"\n";
                  abort ();
                }

              double want = data[j].want;
              if (neg)
                want = -want;
              if (mpf_cmp_d (got, want) != 0)
                {
                  cout << "istream mpf_t operator>> wrong\n";
                  cout << "  point " << point[i] << "\n";
                  cout << "  str   \"" << str << "\"\n";
                  cout << "  got   " << got << "\n";
                  cout << "  want  " << want << "\n";
                  cout << "  localeconv point \""
                       << localeconv()->decimal_point << "\"\n";
                  abort ();
                }
            }
        }
    }

  mpf_clear (got);
}

void
check_output (void)
{
  static char point[] = {
    '.', ',', 'x', '\xFF'
  };

  for (size_t i = 0; i < numberof (point); i++)
    {
      set_point (point[i]);
      ostringstream  got;

      mpf_t  f;
      mpf_init (f);
      mpf_set_d (f, 1.5);
      got << f;
      mpf_clear (f);

      string  want = string("1") + point[i] + string("5");

      if (want.compare (got.str()) != 0)
        {
          cout << "ostream mpf_t operator<< doesn't respect locale\n";
          cout << "  point " << point[i] << "\n";
          cout << "  got   \"" << got.str() << "\"\n";
          cout << "  want  \"" << want      << "\"\n";
          abort ();
        }
    }
}

int
replacement_works (void)
{
  set_point ('x');
  mpf_t  f;
  mpf_init (f);
  mpf_set_d (f, 1.5);
  ostringstream s;
  s << f;
  mpf_clear (f);

  return (s.str().compare("1x5") == 0);
}

int
main (void)
{
  tests_start ();

  if (replacement_works())
    {
      check_input ();
      check_output ();
    }
  else
    {
      cout << "Replacing decimal point didn't work, tests skipped\n";
    }

  tests_end ();
  return 0;
}
