99 lines
3.3 KiB
C
Executable File
99 lines
3.3 KiB
C
Executable File
/* Case-mapping context of suffix UTF-8/UTF-16/UTF-32 string.
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Copyright (C) 2009-2024 Free Software Foundation, Inc.
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Written by Bruno Haible <bruno@clisp.org>, 2009.
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This file is free software.
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It is dual-licensed under "the GNU LGPLv3+ or the GNU GPLv2+".
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You can redistribute it and/or modify it under either
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- the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation, either version 3, or (at your
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option) any later version, or
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- the terms of the GNU General Public License as published by the
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Free Software Foundation; either version 2, or (at your option)
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any later version, or
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- the same dual license "the GNU LGPLv3+ or the GNU GPLv2+".
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License and the GNU General Public License
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for more details.
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You should have received a copy of the GNU Lesser General Public
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License and of the GNU General Public License along with this
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program. If not, see <https://www.gnu.org/licenses/>. */
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casing_suffix_context_t
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FUNC1 (const UNIT *s, size_t n)
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{
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return FUNC2 (s, n, unicase_empty_suffix_context);
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}
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casing_suffix_context_t
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FUNC2 (const UNIT *s, size_t n, casing_suffix_context_t a_context)
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{
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casing_suffix_context_t context;
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/* Evaluate all three conditions in a single pass through the string S.
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The three variables are -1 as long as the value of the condition has
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not been determined. */
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ucs4_t first_char_except_ignorable = (ucs4_t)(-1);
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int scc_MORE_ABOVE = -1;
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int scc_BEFORE_DOT = -1;
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const UNIT *s_end = s + n;
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while (s < s_end)
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{
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ucs4_t uc;
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int count = U_MBTOUC_UNSAFE (&uc, s, s_end - s);
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if (first_char_except_ignorable == (ucs4_t)(-1))
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{
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if (!uc_is_case_ignorable (uc))
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first_char_except_ignorable = uc;
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}
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if (scc_MORE_ABOVE < 0)
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{
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int ccc = uc_combining_class (uc);
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if (ccc == UC_CCC_A)
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scc_MORE_ABOVE = SCC_MORE_ABOVE_MASK;
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else if (ccc == UC_CCC_NR)
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scc_MORE_ABOVE = 0;
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}
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if (scc_BEFORE_DOT < 0)
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{
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if (uc == 0x0307) /* COMBINING DOT ABOVE */
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scc_BEFORE_DOT = SCC_BEFORE_DOT_MASK;
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else
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{
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int ccc = uc_combining_class (uc);
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if (ccc == UC_CCC_A || ccc == UC_CCC_NR)
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scc_BEFORE_DOT = 0;
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}
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}
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if (first_char_except_ignorable != (ucs4_t)(-1)
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&& (scc_MORE_ABOVE | scc_BEFORE_DOT) >= 0)
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/* All conditions have been determined. */
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break;
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s += count;
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}
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/* For those conditions that have not been determined so far, use the
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value from the argument context. */
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context.first_char_except_ignorable =
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(first_char_except_ignorable != (ucs4_t)(-1)
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? first_char_except_ignorable
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: a_context.first_char_except_ignorable);
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context.bits =
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(scc_MORE_ABOVE >= 0
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? scc_MORE_ABOVE
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: a_context.bits & SCC_MORE_ABOVE_MASK)
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| (scc_BEFORE_DOT >= 0
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? scc_BEFORE_DOT
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: a_context.bits & SCC_BEFORE_DOT_MASK);
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return context;
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}
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