1/* Test whether a Unicode character is case-ignorable.
2   Copyright (C) 2002, 2006-2007, 2009-2010 Free Software Foundation, Inc.
3   Written by Bruno Haible <bruno@clisp.org>, 2009.
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 "caseprop.h"
22
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
35   and
36     C (\p{case-ignorable})* \p{cased}
37 */
38
39#if 0
40
41#include "unictype.h"
42#include "uniwbrk.h"
43
44bool
45uc_is_case_ignorable (ucs4_t uc)
46{
47  int wbp = uc_wordbreak_property (uc);
48
49  return (wbp == WBP_MIDLETTER || wbp == WBP_MIDNUMLET
50          || uc_is_general_category_withtable (uc, UC_CATEGORY_MASK_Mn
51                                                   | UC_CATEGORY_MASK_Me
52                                                   | UC_CATEGORY_MASK_Cf
53                                                   | UC_CATEGORY_MASK_Lm
54                                                   | UC_CATEGORY_MASK_Sk))
55         && !uc_is_cased (uc);
56}
57
58#else
59
60#include "unictype/bitmap.h"
61
62/* Define u_casing_property_case_ignorable table.  */
63#include "ignorable.h"
64
65bool
66uc_is_case_ignorable (ucs4_t uc)
67{
68  return bitmap_lookup (&u_casing_property_case_ignorable, uc);
69}
70
71#endif
72