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/* Case-mapping context of suffix UTF-8/UTF-16/UTF-32 string.
Copyright (C) 2009-2022 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/>. */
casing_suffix_context_t
FUNC1 (const UNIT *s, size_t n)
{
return FUNC2 (s, n, unicase_empty_suffix_context);
}
casing_suffix_context_t
FUNC2 (const UNIT *s, size_t n, casing_suffix_context_t a_context)
{
casing_suffix_context_t context;
/* Evaluate all three conditions in a single pass through the string S.
The three variables are -1 as long as the value of the condition has
not been determined. */
ucs4_t first_char_except_ignorable = (ucs4_t)(-1);
int scc_MORE_ABOVE = -1;
int scc_BEFORE_DOT = -1;
const UNIT *s_end = s + n;
while (s < s_end)
{
ucs4_t uc;
int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);
if (first_char_except_ignorable == (ucs4_t)(-1))
{
if (!uc_is_case_ignorable (uc))
first_char_except_ignorable = uc;
}
if (scc_MORE_ABOVE < 0)
{
int ccc = uc_combining_class (uc);
if (ccc == UC_CCC_A)
scc_MORE_ABOVE = SCC_MORE_ABOVE_MASK;
else if (ccc == UC_CCC_NR)
scc_MORE_ABOVE = 0;
}
if (scc_BEFORE_DOT < 0)
{
if (uc == 0x0307) /* COMBINING DOT ABOVE */
scc_BEFORE_DOT = SCC_BEFORE_DOT_MASK;
else
{
int ccc = uc_combining_class (uc);
if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
scc_BEFORE_DOT = 0;
}
}
if (first_char_except_ignorable != (ucs4_t)(-1)
&& (scc_MORE_ABOVE | scc_BEFORE_DOT) >= 0)
/* All conditions have been determined. */
break;
s += count;
}
/* For those conditions that have not been determined so far, use the
value from the argument context. */
context.first_char_except_ignorable =
(first_char_except_ignorable != (ucs4_t)(-1)
? first_char_except_ignorable
: a_context.first_char_except_ignorable);
context.bits =
(scc_MORE_ABOVE >= 0
? scc_MORE_ABOVE
: a_context.bits & SCC_MORE_ABOVE_MASK)
| (scc_BEFORE_DOT >= 0
? scc_BEFORE_DOT
: a_context.bits & SCC_BEFORE_DOT_MASK);
return context;
}
|
