/* Canonical combining classes of Unicode characters.
   Copyright (C) 2002, 2006-2007, 2011-2016 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2011.

   This program is free software: you can redistribute it and/or
   modify it under the terms of either:

     * the GNU Lesser General Public License as published by the Free
       Software Foundation; either version 3 of the License, or (at your
       option) any later version.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include "unictype.h"

#include <stdlib.h>

static const signed char u_combining_class_index_part1[10] =
{
   0, /* Not Reordered */
   1, /* Overlay */
  -1,
  -1,
  -1,
  -1,
  -1,
   2, /* Nukta */
   3, /* Kana Voicing */
   4  /* Virama */
};
static const signed char u_combining_class_index_part2[241 - 200] =
{
   5, /* Attached Below Left */
  -1,
   6, /* Attached Below */
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
  -1,
   7, /* Attached Above */
  -1,
   8, /* Attached Above Right */
  -1,
   9, /* Below Left */
  -1,
  10, /* Below */
  -1,
  11, /* Below Right */
  -1,
  12, /* Left */
  -1,
  13, /* Right */
  -1,
  14, /* Above Left */
  -1,
  15, /* Above */
  -1,
  16, /* Above Right */
  17, /* Double Below */
  18, /* Double Above */
  -1,
  -1,
  -1,
  -1,
  -1,
  19  /* Iota Subscript */
};

static const char u_combining_class_name[20][5] =
{
  "NR",   /* Not Reordered */
  "OV",   /* Overlay */
  "NK",   /* Nukta */
  "KV",   /* Kana Voicing */
  "VR",   /* Virama */
  "ATBL", /* Attached Below Left */
  "ATB",  /* Attached Below */
  "ATA",  /* Attached Above */
  "ATAR", /* Attached Above Right */
  "BL",   /* Below Left */
  "B",    /* Below */
  "BR",   /* Below Right */
  "L",    /* Left */
  "R",    /* Right */
  "AL",   /* Above Left */
  "A",    /* Above */
  "AR",   /* Above Right */
  "DB",   /* Double Below */
  "DA",   /* Double Above */
  "IS"    /* Iota Subscript */
};

const char *
uc_combining_class_name (int ccc)
{
  if (ccc >= 0)
    {
      int index;

      if (ccc < 10)
        index = u_combining_class_index_part1[ccc];
      else if (ccc >= 200 && ccc < 241)
        index = u_combining_class_index_part2[ccc - 200];
      else
        return NULL;

      if (index >= 0)
        {
          if (index < sizeof (u_combining_class_name) / sizeof (u_combining_class_name[0]))
            return u_combining_class_name[index];
          else
            abort ();
        }
    }
  return NULL;
}