root/maint/gnulib/lib/unictype/categ_of.c

/* */

DEFINITIONS

1. lookup_withtable
2. uc_is_general_category_withtable
3. uc_general_category

   1 /* Categories of Unicode characters.
   2    Copyright (C) 2002, 2006-2007, 2009-2021 Free Software Foundation, Inc.
   3    Written by Bruno Haible <bruno@clisp.org>, 2002.
   4 
   5    This file is free software: you can redistribute it and/or modify
   6    it under the terms of the GNU Lesser General Public License as
   7    published by the Free Software Foundation; either version 2.1 of the
   8    License, or (at your option) any later version.
   9 
  10    This file 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
  13    GNU 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 /* Define u_category table.  */
  24 #include "categ_of.h"
  25 
  26 static inline int
  27 lookup_withtable (ucs4_t uc)
     /*  */
  28 {
  29   unsigned int index1 = uc >> category_header_0;
  30   if (index1 < category_header_1)
  31     {
  32       int lookup1 = u_category.level1[index1];
  33       if (lookup1 >= 0)
  34         {
  35           unsigned int index2 = (uc >> category_header_2) & category_header_3;
  36           int lookup2 = u_category.level2[lookup1 + index2];
  37           if (lookup2 >= 0)
  38             {
  39               unsigned int index3 = ((uc & category_header_4) + lookup2) * 5;
  40               /* level3 contains 5-bit values, packed into 16-bit words.  */
  41               unsigned int lookup3 =
  42                 (((unsigned int) u_category.level3[index3>>4]
  43                   | ((unsigned int) u_category.level3[(index3>>4)+1] << 16))
  44                  >> (index3 % 16))
  45                 & 0x1f;
  46 
  47               return lookup3;
  48             }
  49         }
  50       return 29; /* = log2(UC_CATEGORY_MASK_Cn) */
  51     }
  52   return -1;
  53 }
  54 
  55 bool
  56 uc_is_general_category_withtable (ucs4_t uc, uint32_t bitmask)
     /*  */
  57 {
  58   int bit = lookup_withtable (uc);
  59 
  60   if (bit >= 0)
  61     return ((bitmask >> bit) & 1);
  62   else
  63     return false;
  64 }
  65 
  66 uc_general_category_t
  67 uc_general_category (ucs4_t uc)
     /*  */
  68 {
  69   int bit = lookup_withtable (uc);
  70   uc_general_category_t result;
  71 
  72   if (bit >= 0)
  73     {
  74       result.bitmask = 1 << bit;
  75       result.generic = 1;
  76       result.lookup.lookup_fn = &uc_is_general_category_withtable;
  77       return result;
  78     }
  79   else
  80     return _UC_CATEGORY_NONE;
  81 }

/* */