1/* Categories of Unicode characters.
2   Copyright (C) 2002, 2006-2007, 2009-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2002.
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 <http://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
26static inline int
27lookup_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                ((u_category.level3[index3>>4]
43                  | (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
55bool
56uc_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
66uc_general_category_t
67uc_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}
82