/* Categories of Unicode characters.
   Copyright (C) 2002, 2006-2007, 2011-2022 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2011.

   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 "unictype.h"

static const char u_category_long_name[30][22] =
{
  "Uppercase Letter",
  "Lowercase Letter",
  "Titlecase Letter",
  "Modifier Letter",
  "Other Letter",
  "Nonspacing Mark",
  "Spacing Mark",
  "Enclosing Mark",
  "Decimal Number",
  "Letter Number",
  "Other Number",
  "Connector Punctuation",
  "Dash Punctuation",
  "Open Punctuation",
  "Close Punctuation",
  "Initial Punctuation",
  "Final Punctuation",
  "Other Punctuation",
  "Math Symbol",
  "Currency Symbol",
  "Modifier Symbol",
  "Other Symbol",
  "Space Separator",
  "Line Separator",
  "Paragraph Separator",
  "Control",
  "Format",
  "Surrogate",
  "Private Use",
  "Unassigned"
};

const char *
uc_general_category_long_name (uc_general_category_t category)
{
  uint32_t bitmask = category.bitmask;
  /* bitmask should consist of a single bit.  */
  if (bitmask != 0)
    {
      if ((bitmask & (bitmask - 1)) == 0)
        {
          int bit;
          /* Take log2 using a variant of Robert Harley's method.
             Found by Bruno Haible 1996.  */
          uint32_t n = bitmask;
          static const char ord2_tab[64] =
            {
              -1,  0,  1, 12,  2,  6, -1, 13,  3, -1,  7, -1, -1, -1, -1, 14,
              10,  4, -1, -1,  8, -1, -1, 25, -1, -1, -1, -1, -1, 21, 27, 15,
              31, 11,  5, -1, -1, -1, -1, -1,  9, -1, -1, 24, -1, -1, 20, 26,
              30, -1, -1, -1, -1, 23, -1, 19, 29, -1, 22, 18, 28, 17, 16, -1
            };
          n += n << 4;
          n += n << 6;
          n = (n << 16) - n;
          bit = ord2_tab[n >> 26];

          if (bit < sizeof (u_category_long_name) / sizeof (u_category_long_name[0]))
            return u_category_long_name[bit];
        }
      else
        {
          if (bitmask == UC_CATEGORY_MASK_L)
            return "Letter";
          if (bitmask == UC_CATEGORY_MASK_LC)
            return "Cased Letter";
          if (bitmask == UC_CATEGORY_MASK_M)
            return "Mark";
          if (bitmask == UC_CATEGORY_MASK_N)
            return "Number";
          if (bitmask == UC_CATEGORY_MASK_P)
            return "Punctuation";
          if (bitmask == UC_CATEGORY_MASK_S)
            return "Symbol";
          if (bitmask == UC_CATEGORY_MASK_Z)
            return "Separator";
          if (bitmask == UC_CATEGORY_MASK_C)
            return "Other";
        }
    }
  return NULL;
}
