/* Test whether a Unicode character is case-ignorable.

   Copyright (C) 2002, 2006-2007, 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/>.  */

#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