/* Scripts of Unicode characters.
   Copyright (C) 2007, 2009-2018 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2007.

   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 <https://www.gnu.org/licenses/>.  */

#include <config.h>

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

#include <string.h>

#include "scripts.h"
#include "unictype/scripts_byname.h"

const uc_script_t *
uc_script (ucs4_t uc)
{
  unsigned int index1 = uc >> script_header_0;
  if (index1 < script_header_1)
    {
      int lookup1 = u_script.level1[index1];
      if (lookup1 >= 0)
        {
          unsigned int index2 = (uc >> script_header_2) & script_header_3;
          int lookup2 = u_script.level2[lookup1 + index2];
          if (lookup2 >= 0)
            {
              unsigned int index3 = (uc & script_header_4);
              unsigned char lookup3 = u_script.level3[lookup2 + index3];

              if (lookup3 != 0xff)
                return &scripts[lookup3];
            }
        }
    }
  return NULL;
}

const uc_script_t *
uc_script_byname (const char *script_name)
{
  const struct named_script *found;

  found = uc_script_lookup (script_name, strlen (script_name));
  if (found != NULL)
    return &scripts[found->index];
  else
    return NULL;
}

bool
uc_is_script (ucs4_t uc, const uc_script_t *script)
{
  return uc_script (uc) == script;
}

void
uc_all_scripts (const uc_script_t **scriptsp, size_t *countp)
{
  *scriptsp = scripts;
  *countp = sizeof (scripts) / sizeof (scripts[0]);
}
