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