/* Scripts of Unicode characters.

   Copyright (C) 2007, 2009-2017 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 the GNU General Public License as published

   by the Free Software Foundation; either version 3 of the License, or

   (at your option) any later version.

   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

   General Public License for more details.

   You should have received a copy of the GNU 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]);

}