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/* Canonical composition of Unicode characters.
Copyright (C) 2002, 2006, 2009, 2011-2023 Free Software Foundation, Inc.
Written by Bruno Haible <bruno@clisp.org>, 2009.
This file 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 2.1 of the
License, or (at your option) any later version.
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 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 "uninorm.h"
#include <string.h>
struct composition_rule { char codes[6]; unsigned int combined; };
#include "composition-table.h"
ucs4_t
uc_composition (ucs4_t uc1, ucs4_t uc2)
{
if (uc1 < 0x12000 && uc2 < 0x12000)
{
if (uc2 >= 0x1161 && uc2 < 0x1161 + 21
&& uc1 >= 0x1100 && uc1 < 0x1100 + 19)
{
/* Hangul: Combine single letter L and single letter V to form
two-letter syllable LV. */
return 0xAC00 + ((uc1 - 0x1100) * 21 + (uc2 - 0x1161)) * 28;
}
else if (uc2 > 0x11A7 && uc2 < 0x11A7 + 28
&& uc1 >= 0xAC00 && uc1 < 0xD7A4 && ((uc1 - 0xAC00) % 28) == 0)
{
/* Hangul: Combine two-letter syllable LV with single-letter T
to form three-letter syllable LVT. */
return uc1 + (uc2 - 0x11A7);
}
else
{
#if 0
unsigned int uc = MUL1 * uc1 * MUL2 * uc2;
unsigned int index1 = uc >> composition_header_0;
if (index1 < composition_header_1)
{
int lookup1 = u_composition.level1[index1];
if (lookup1 >= 0)
{
unsigned int index2 = (uc >> composition_header_2) & composition_header_3;
int lookup2 = u_composition.level2[lookup1 + index2];
if (lookup2 >= 0)
{
unsigned int index3 = (uc & composition_header_4);
unsigned int lookup3 = u_composition.level3[lookup2 + index3];
if ((lookup3 >> 16) == uc2)
return lookup3 & ((1U << 16) - 1);
}
}
}
#else
char codes[6];
const struct composition_rule *rule;
codes[0] = (uc1 >> 16) & 0xff;
codes[1] = (uc1 >> 8) & 0xff;
codes[2] = uc1 & 0xff;
codes[3] = (uc2 >> 16) & 0xff;
codes[4] = (uc2 >> 8) & 0xff;
codes[5] = uc2 & 0xff;
rule = gl_uninorm_compose_lookup (codes, 6);
if (rule != NULL)
return rule->combined;
#endif
}
}
return 0;
}
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