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/* Test whether a Unicode character is case-ignorable.
Copyright (C) 2002, 2006-2007, 2009-2024 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This file is free software.
It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
You can redistribute it and/or modify it under either
- the terms of the GNU Lesser General Public License as published
by the Free Software Foundation, either version 3, or (at your
option) any later version, or
- the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option)
any later version, or
- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
This file 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 and the GNU General Public License
for more details.
You should have received a copy of the GNU Lesser General Public
License and of the GNU General Public License along with this
program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "caseprop.h"
/* Quoting the Unicode standard:
Definition: A character is defined to be "case-ignorable" if it has the
value MidLetter {or the value MidNumLet} for the Word_Break property or
its General_Category is one of Nonspacing_Mark (Mn), Enclosing_Mark (Me),
Format (Cf), Modifier_Letter (Lm), or Modifier_Symbol (Sk).
The text marked in braces was added in Unicode 5.1.0, see
<https://www.unicode.org/versions/Unicode5.1.0/> section "Update of
Definition of case-ignorable". */
/* Since this predicate is only used for the "Before C" and "After C"
conditions of FINAL_SIGMA, we exclude the "cased" characters here.
This simplifies the evaluation of the regular expressions
\p{cased} (\p{case-ignorable})* C
and
C (\p{case-ignorable})* \p{cased}
*/
#if 0
#include "unictype.h"
#include "uniwbrk.h"
bool
uc_is_case_ignorable (ucs4_t uc)
{
int wbp = uc_wordbreak_property (uc);
return (wbp == WBP_MIDLETTER || wbp == WBP_MIDNUMLET
|| uc_is_general_category_withtable (uc, UC_CATEGORY_MASK_Mn
| UC_CATEGORY_MASK_Me
| UC_CATEGORY_MASK_Cf
| UC_CATEGORY_MASK_Lm
| UC_CATEGORY_MASK_Sk))
&& !uc_is_cased (uc);
}
#else
#include "unictype/bitmap.h"
/* Define u_casing_property_case_ignorable table. */
#include "ignorable.h"
bool
uc_is_case_ignorable (ucs4_t uc)
{
return bitmap_lookup (&u_casing_property_case_ignorable, uc);
}
#endif
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