diff options
Diffstat (limited to 'lib/unictype/identsyntaxmap.h')
-rw-r--r-- | lib/unictype/identsyntaxmap.h | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/lib/unictype/identsyntaxmap.h b/lib/unictype/identsyntaxmap.h new file mode 100644 index 0000000..5d9db39 --- /dev/null +++ b/lib/unictype/identsyntaxmap.h @@ -0,0 +1,42 @@ +/* Three-level bitmap lookup. + Copyright (C) 2000-2002, 2005-2007 Free Software Foundation, Inc. + Written by Bruno Haible <bruno@clisp.org>, 2000-2002. + + This program is free software: you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published + by the Free Software Foundation; either version 3 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with this program. If not, see <http://www.gnu.org/licenses/>. */ + +static inline int identsyntax_lookup (ucs4_t uc); + +static inline int +identsyntax_lookup (ucs4_t uc) +{ + unsigned int index1 = uc >> identsyntax_header_0; + if (index1 < identsyntax_header_1) + { + int lookup1 = TABLE.level1[index1]; + if (lookup1 >= 0) + { + unsigned int index2 = (uc >> identsyntax_header_2) & identsyntax_header_3; + int lookup2 = TABLE.level2[lookup1 + index2]; + if (lookup2 >= 0) + { + unsigned int index3 = (uc & identsyntax_header_4) + lookup2; + /* level3 contains 2-bit values. */ + unsigned int lookup3 = TABLE.level3[index3 >> 3]; + + return (lookup3 >> (2 * (index3 & 7))) & 3; + } + } + } + return UC_IDENTIFIER_INVALID; +} |