lib/unictype/scripts.c

   1 /* Scripts of Unicode characters.
   2    Copyright (C) 2007, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2007.
   4
   5    This program is free software: you can redistribute it and/or modify it
   6    under the terms of the GNU Lesser General Public License as published
   7    by the Free Software Foundation; either version 3 of the License, or
   8    (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public License
  16    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 /* Specification.  */
  21 #include "unictype.h"
  22
  23 #include <string.h>
  24
  25 #include "scripts.h"
  26 #include "unictype/scripts_byname.h"
  27
  28 const uc_script_t *
  29 uc_script (ucs4_t uc)
  30 {
  31   unsigned int index1 = uc >> script_header_0;
  32   if (index1 < script_header_1)
  33     {
  34       int lookup1 = u_script.level1[index1];
  35       if (lookup1 >= 0)
  36         {
  37           unsigned int index2 = (uc >> script_header_2) & script_header_3;
  38           int lookup2 = u_script.level2[lookup1 + index2];
  39           if (lookup2 >= 0)
  40             {
  41               unsigned int index3 = (uc & script_header_4);
  42               unsigned char lookup3 = u_script.level3[lookup2 + index3];
  43
  44               if (lookup3 != 0xff)
  45                 return &scripts[lookup3];
  46             }
  47         }
  48     }
  49   return NULL;
  50 }
  51
  52 const uc_script_t *
  53 uc_script_byname (const char *script_name)
  54 {
  55   const struct named_script *found;
  56
  57   found = uc_script_lookup (script_name, strlen (script_name));
  58   if (found != NULL)
  59     return &scripts[found->index];
  60   else
  61     return NULL;
  62 }
  63
  64 bool
  65 uc_is_script (ucs4_t uc, const uc_script_t *script)
  66 {
  67   return uc_script (uc) == script;
  68 }
  69
  70 void
  71 uc_all_scripts (const uc_script_t **scriptsp, size_t *countp)
  72 {
  73   *scriptsp = scripts;
  74   *countp = sizeof (scripts) / sizeof (scripts[0]);
  75 }