1 /* Test whether a Unicode character is case-ignorable.
2 Copyright (C) 2002, 2006-2007, 2009-2012 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2009.
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 /* Quoting the Unicode standard:
24 Definition: A character is defined to be "case-ignorable" if it has the
25 value MidLetter {or the value MidNumLet} for the Word_Break property or
26 its General_Category is one of Nonspacing_Mark (Mn), Enclosing_Mark (Me),
27 Format (Cf), Modifier_Letter (Lm), or Modifier_Symbol (Sk).
28 The text marked in braces was added in Unicode 5.1.0, see
29 <http://www.unicode.org/versions/Unicode5.1.0/> section "Update of
30 Definition of case-ignorable". */
31 /* Since this predicate is only used for the "Before C" and "After C"
32 conditions of FINAL_SIGMA, we exclude the "cased" characters here.
33 This simplifies the evaluation of the regular expressions
34 \p{cased} (\p{case-ignorable})* C
36 C (\p{case-ignorable})* \p{cased}
45 uc_is_case_ignorable (ucs4_t uc)
47 int wbp = uc_wordbreak_property (uc);
49 return (wbp == WBP_MIDLETTER || wbp == WBP_MIDNUMLET
50 || uc_is_general_category_withtable (uc, UC_CATEGORY_MASK_Mn
54 | UC_CATEGORY_MASK_Sk))
60 #include "unictype/bitmap.h"
62 /* Define u_casing_property_case_ignorable table. */
63 #include "ignorable.h"
66 uc_is_case_ignorable (ucs4_t uc)
68 return bitmap_lookup (&u_casing_property_case_ignorable, uc);