lib/unictype/combiningclass_name.c

   1 /* Canonical combining classes of Unicode characters.
   2    Copyright (C) 2002, 2006-2007, 2011-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2011.
   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 <stdlib.h>
  24
  25 static const signed char u_combining_class_index_part1[10] =
  26 {
  27    0, /* Not Reordered */
  28    1, /* Overlay */
  29   -1,
  30   -1,
  31   -1,
  32   -1,
  33   -1,
  34    2, /* Nukta */
  35    3, /* Kana Voicing */
  36    4  /* Virama */
  37 };
  38 static const signed char u_combining_class_index_part2[241 - 200] =
  39 {
  40    5, /* Attached Below Left */
  41   -1,
  42    6, /* Attached Below */
  43   -1,
  44   -1,
  45   -1,
  46   -1,
  47   -1,
  48   -1,
  49   -1,
  50   -1,
  51   -1,
  52   -1,
  53   -1,
  54    7, /* Attached Above */
  55   -1,
  56    8, /* Attached Above Right */
  57   -1,
  58    9, /* Below Left */
  59   -1,
  60   10, /* Below */
  61   -1,
  62   11, /* Below Right */
  63   -1,
  64   12, /* Left */
  65   -1,
  66   13, /* Right */
  67   -1,
  68   14, /* Above Left */
  69   -1,
  70   15, /* Above */
  71   -1,
  72   16, /* Above Right */
  73   17, /* Double Below */
  74   18, /* Double Above */
  75   -1,
  76   -1,
  77   -1,
  78   -1,
  79   -1,
  80   19  /* Iota Subscript */
  81 };
  82
  83 static const char u_combining_class_name[20][5] =
  84 {
  85   "NR",   /* Not Reordered */
  86   "OV",   /* Overlay */
  87   "NK",   /* Nukta */
  88   "KV",   /* Kana Voicing */
  89   "VR",   /* Virama */
  90   "ATBL", /* Attached Below Left */
  91   "ATB",  /* Attached Below */
  92   "ATA",  /* Attached Above */
  93   "ATAR", /* Attached Above Right */
  94   "BL",   /* Below Left */
  95   "B",    /* Below */
  96   "BR",   /* Below Right */
  97   "L",    /* Left */
  98   "R",    /* Right */
  99   "AL",   /* Above Left */
 100   "A",    /* Above */
 101   "AR",   /* Above Right */
 102   "DB",   /* Double Below */
 103   "DA",   /* Double Above */
 104   "IS"    /* Iota Subscript */
 105 };
 106
 107 const char *
 108 uc_combining_class_name (int ccc)
 109 {
 110   if (ccc >= 0)
 111     {
 112       int index;
 113
 114       if (ccc < 10)
 115         index = u_combining_class_index_part1[ccc];
 116       else if (ccc >= 200 && ccc < 241)
 117         index = u_combining_class_index_part2[ccc - 200];
 118       else
 119         return NULL;
 120
 121       if (index >= 0)
 122         {
 123           if (index < sizeof (u_combining_class_name) / sizeof (u_combining_class_name[0]))
 124             return u_combining_class_name[index];
 125           else
 126             abort ();
 127         }
 128     }
 129   return NULL;
 130 }