/* Test whether a Unicode character is case-ignorable.
   Copyright (C) 2002, 2006-2007, 2009-2018 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 either:

     * 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.

   or

     * the GNU General Public License as published by the Free
       Software Foundation; either version 2 of the License, or (at your
       option) any later version.

   or both in parallel, as here.
   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
   <http://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
