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/* Case-mapping contexts of UTF-8/UTF-16/UTF-32 substring.
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/>. */
/* The context of a prefix string combines the information of the "Before C"
conditions of the Unicode Standard,
<https://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
table 3-14 "Context Specification for Casing".
casing_prefix_context_t contains the following fields:
// Helper for evaluating the FINAL_SIGMA condition:
// Last character that was not case-ignorable.
ucs4_t last_char_except_ignorable;
// Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions:
// Last character that was of combining class 230 ("Above") or 0.
ucs4_t last_char_normal_or_above;
Three bits would be sufficient to carry the context information, but
that would require to invoke uc_is_cased and uc_is_property_soft_dotted
ahead of time, more often than actually needed. */
/* The context of a suffix string combines the information of the "After C"
conditions of the Unicode Standard,
<https://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13,
table 3-14 "Context Specification for Casing".
casing_suffix_context_t contains the following fields:
// For evaluating the FINAL_SIGMA condition:
// First character that was not case-ignorable.
ucs4_t first_char_except_ignorable;
// For evaluating the MORE_ABOVE condition:
// Bit 0 is set if the suffix contains a character of combining class
// 230 (Above) with no character of combining class 0 or 230 (Above)
// before it.
//
// For evaluating the BEFORE_DOT condition:
// Bit 1 is set if the suffix contains a COMBINING DOT ABOVE (U+0307)
// with no character of combining class 0 or 230 (Above) before it.
//
uint32_t bits;
Three bits would be sufficient to carry the context information, but
that would require to invoke uc_is_cased ahead of time, more often than
actually needed. */
#define SCC_MORE_ABOVE_MASK 1
#define SCC_BEFORE_DOT_MASK 2
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