| /* Test whether a Unicode character is case-ignorable. |
| Copyright (C) 2002, 2006-2007, 2009-2020 Free Software Foundation, Inc. |
| Written by Bruno Haible <bruno@clisp.org>, 2009. |
| |
| This program is free software: you can redistribute it and/or modify it |
| under the terms of the GNU Lesser General Public License as published |
| by the Free Software Foundation; either version 3 of the License, or |
| (at your option) any later version. |
| |
| This program 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 for more details. |
| |
| You should have received a copy of the GNU Lesser General Public License |
| along with this program. If not, see <https://www.gnu.org/licenses/>. */ |
| |
| #include <config.h> |
| |
| /* Specification. */ |
| #include "caseprop.h" |
| |
| /* Quoting the Unicode standard: |
| Definition: A character is defined to be "case-ignorable" if it has the |
| value MidLetter {or the value MidNumLet} for the Word_Break property or |
| its General_Category is one of Nonspacing_Mark (Mn), Enclosing_Mark (Me), |
| Format (Cf), Modifier_Letter (Lm), or Modifier_Symbol (Sk). |
| The text marked in braces was added in Unicode 5.1.0, see |
| <https://www.unicode.org/versions/Unicode5.1.0/> section "Update of |
| Definition of case-ignorable". */ |
| /* Since this predicate is only used for the "Before C" and "After C" |
| conditions of FINAL_SIGMA, we exclude the "cased" characters here. |
| This simplifies the evaluation of the regular expressions |
| \p{cased} (\p{case-ignorable})* C |
| and |
| C (\p{case-ignorable})* \p{cased} |
| */ |
| |
| #if 0 |
| |
| #include "unictype.h" |
| #include "uniwbrk.h" |
| |
| bool |
| uc_is_case_ignorable (ucs4_t uc) |
| { |
| int wbp = uc_wordbreak_property (uc); |
| |
| return (wbp == WBP_MIDLETTER || wbp == WBP_MIDNUMLET |
| || uc_is_general_category_withtable (uc, UC_CATEGORY_MASK_Mn |
| | UC_CATEGORY_MASK_Me |
| | UC_CATEGORY_MASK_Cf |
| | UC_CATEGORY_MASK_Lm |
| | UC_CATEGORY_MASK_Sk)) |
| && !uc_is_cased (uc); |
| } |
| |
| #else |
| |
| #include "unictype/bitmap.h" |
| |
| /* Define u_casing_property_case_ignorable table. */ |
| #include "ignorable.h" |
| |
| bool |
| uc_is_case_ignorable (ucs4_t uc) |
| { |
| return bitmap_lookup (&u_casing_property_case_ignorable, uc); |
| } |
| |
| #endif |