1/* Case-mapping contexts of UTF-8/UTF-16/UTF-32 substring. 2 Copyright (C) 2009-2010 Free Software Foundation, Inc. 3 Written by Bruno Haible <bruno@clisp.org>, 2009. 4 5 This program is free software: you can redistribute it and/or modify it 6 under the terms of the GNU Lesser General Public License as published 7 by the Free Software Foundation; either version 3 of the License, or 8 (at your option) any later version. 9 10 This program is distributed in the hope that it will be useful, 11 but WITHOUT ANY WARRANTY; without even the implied warranty of 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 13 Lesser General Public License for more details. 14 15 You should have received a copy of the GNU Lesser General Public License 16 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 17 18 19/* The context of a prefix string combines the information of the "Before C" 20 conditions of the Unicode Standard, 21 <http://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13, 22 table 3-14 "Context Specification for Casing". 23 24 casing_prefix_context_t contains the following fields: 25 26 // Helper for evaluating the FINAL_SIGMA condition: 27 // Last character that was not case-ignorable. 28 ucs4_t last_char_except_ignorable; 29 30 // Helper for evaluating the AFTER_SOFT_DOTTED and AFTER_I conditions: 31 // Last character that was of combining class 230 ("Above") or 0. 32 ucs4_t last_char_normal_or_above; 33 34 Three bits would be sufficient to carry the context information, but 35 that would require to invoke uc_is_cased and uc_is_property_soft_dotted 36 ahead of time, more often than actually needed. */ 37 38 39/* The context of a suffix string combines the information of the "After C" 40 conditions of the Unicode Standard, 41 <http://www.unicode.org/versions/Unicode5.0.0/ch03.pdf>, section 3.13, 42 table 3-14 "Context Specification for Casing". 43 44 casing_suffix_context_t contains the following fields: 45 46 // For evaluating the FINAL_SIGMA condition: 47 // First character that was not case-ignorable. 48 ucs4_t first_char_except_ignorable; 49 50 // For evaluating the MORE_ABOVE condition: 51 // Bit 0 is set if the suffix contains a character of combining class 52 // 230 (Above) with no character of combining class 0 or 230 (Above) 53 // before it. 54 // 55 // For evaluating the BEFORE_DOT condition: 56 // Bit 1 is set if the suffix contains a COMBINING DOT ABOVE (U+0307) 57 // with no character of combining class 0 or 230 (Above) before it. 58 // 59 uint32_t bits; 60 61 Three bits would be sufficient to carry the context information, but 62 that would require to invoke uc_is_cased ahead of time, more often than 63 actually needed. */ 64#define SCC_MORE_ABOVE_MASK 1 65#define SCC_BEFORE_DOT_MASK 2 66