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/* Arabic joining type of Unicode characters.
Copyright (C) 2011-2015 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2011.
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 <http://www.gnu.org/licenses/>. */
#include <config.h>
/* Specification. */
#include "unictype.h"
/* Define u_joining_type table. */
#include "joiningtype_of.h"
int
uc_joining_type (ucs4_t uc)
{
unsigned int index1 = uc >> joining_type_header_0;
if (index1 < joining_type_header_1)
{
int lookup1 = u_joining_type.level1[index1];
if (lookup1 >= 0)
{
unsigned int index2 = (uc >> joining_type_header_2) & joining_type_header_3;
int lookup2 = u_joining_type.level2[lookup1 + index2];
if (lookup2 >= 0)
{
unsigned int index3 = (uc & joining_type_header_4) + lookup2;
/* level3 contains 4-bit values. */
unsigned int lookup3 =
(u_joining_type.level3[index3>>1] >> ((index3 % 2) * 4))
& 0x0f;
if (lookup3 != 0x0f)
return lookup3;
}
}
}
if (uc_is_general_category_withtable
(uc, UC_CATEGORY_MASK_Mn | UC_CATEGORY_MASK_Me | UC_CATEGORY_MASK_Cf))
return UC_JOINING_TYPE_T;
return UC_JOINING_TYPE_U;
}
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