1 /* Grapheme cluster break property function.
2 Copyright (C) 2010-2014 Free Software Foundation, Inc.
3 Written by Ben Pfaff <blp@cs.stanford.edu>, 2010.
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/>. */
26 uc_graphemeclusterbreak_property (ucs4_t uc)
28 unsigned int index1 = uc >> gbrkprop_header_0;
29 if (index1 < gbrkprop_header_1)
31 int lookup1 = unigbrkprop.level1[index1];
34 unsigned int index2 = (uc >> gbrkprop_header_2) & gbrkprop_header_3;
35 int lookup2 = unigbrkprop.level2[lookup1 + index2];
38 unsigned int index3 = uc & gbrkprop_header_4;
39 unsigned char lookup3 = unigbrkprop.level3[lookup2 + index3 / 2];
40 return (lookup3 >> ((uc & 1) << 2)) & 0x0f;