1 /* Bidi classes of Unicode characters.
2 Copyright (C) 2002, 2006, 2011-2014 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2002.
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.
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.
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/>. */
23 /* Define u_bidi_category table. */
27 uc_bidi_class (ucs4_t uc)
29 unsigned int index1 = uc >> bidi_category_header_0;
30 if (index1 < bidi_category_header_1)
32 int lookup1 = u_bidi_category.level1[index1];
35 unsigned int index2 = (uc >> bidi_category_header_2) & bidi_category_header_3;
36 int lookup2 = u_bidi_category.level2[lookup1 + index2];
39 unsigned int index3 = ((uc & bidi_category_header_4) + lookup2) * 5;
40 /* level3 contains 5-bit values, packed into 16-bit words. */
41 unsigned int lookup3 =
42 ((u_bidi_category.level3[index3>>4]
43 | (u_bidi_category.level3[(index3>>4)+1] << 16))
55 uc_bidi_category (ucs4_t uc)
57 return uc_bidi_class (uc);