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/* fribidi-arabic.c - Arabic shaping
*
* Copyright (C) 2005 Behdad Esfahbod
*
* This file is part of GNU FriBidi.
*
* GNU FriBidi 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.
*
* GNU FriBidi 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 GNU FriBidi; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* For licensing issues, contact <fribidi.license@gmail.com> or write to
* Sharif FarsiWeb, Inc., PO Box 13445-389, Tehran, Iran.
*
* Author(s):
* Behdad Esfahbod, 2005
*/
#include "common.h"
#if HAVE_STDLIB_H+0
# include <stdlib.h>
#endif
#include <fribidi-arabic.h>
#include <fribidi-unicode.h>
typedef struct _PairMap {
FriBidiChar pair[2], to;
} PairMap;
#define FRIBIDI_ACCESS_SHAPE_TABLE(table,min,max,x,shape) (table), (min), (max)
# define FRIBIDI_ACCESS_SHAPE_TABLE_REAL(table,min,max,x,shape) \
(((x)<(min)||(x)>(max))?(x):(table)[(x)-(min)][(shape)])
#include "arabic-shaping.tab.i"
#include "arabic-misc.tab.i"
static void
fribidi_shape_arabic_joining (
/* input */
const FriBidiChar table[][4],
FriBidiChar min,
FriBidiChar max,
const FriBidiStrIndex len,
const FriBidiArabicProp *ar_props,
/* input and output */
FriBidiChar *str
)
{
register FriBidiStrIndex i;
for (i = 0; i < len; i++)
if (FRIBIDI_ARAB_SHAPES(ar_props[i]))
str[i] = FRIBIDI_ACCESS_SHAPE_TABLE_REAL (table, min, max, str[i], FRIBIDI_JOIN_SHAPE (ar_props[i]));
}
static int
comp_PairMap (const void *pa, const void *pb)
{
PairMap *a = (PairMap *)pa;
PairMap *b = (PairMap *)pb;
if (a->pair[0] != b->pair[0])
return a->pair[0] < b->pair[0] ? -1 : +1;
else
return a->pair[1] < b->pair[1] ? -1 :
a->pair[1] > b->pair[1] ? +1 :
0;
}
static FriBidiChar
find_pair_match (const PairMap *table, int size, FriBidiChar first, FriBidiChar second)
{
PairMap *match;
PairMap x;
x.pair[0] = first;
x.pair[1] = second;
x.to = 0;
match = bsearch (&x, table, size, sizeof (table[0]), comp_PairMap);
return match ? match->to : 0;
}
#define PAIR_MATCH(table,len,first,second) \
((first)<(table[0].pair[0])||(first)>(table[len-1].pair[0])?0: \
find_pair_match(table, len, first, second))
static void
fribidi_shape_arabic_ligature (
/* input */
const PairMap *table,
int size,
const FriBidiLevel *embedding_levels,
const FriBidiStrIndex len,
/* input and output */
FriBidiArabicProp *ar_props,
FriBidiChar *str
)
{
/* TODO: This doesn't form ligatures for even-level Arabic text.
* no big problem though. */
register FriBidiStrIndex i;
for (i = 0; i < len - 1; i++) {
register FriBidiChar c;
if (FRIBIDI_LEVEL_IS_RTL(embedding_levels[i]) &&
embedding_levels[i] == embedding_levels[i+1] &&
(c = PAIR_MATCH(table, size, str[i], str[i+1])))
{
str[i] = FRIBIDI_CHAR_FILL;
FRIBIDI_SET_BITS(ar_props[i], FRIBIDI_MASK_LIGATURED);
str[i+1] = c;
}
}
}
#define DO_LIGATURING(table, levels, len, ar_props, str) \
fribidi_shape_arabic_ligature ((table), sizeof(table)/sizeof((table)[0]), levels, len, ar_props, str)
#define DO_SHAPING(tablemacro, len, ar_props, str) \
fribidi_shape_arabic_joining (tablemacro(,), len, ar_props, str);
FRIBIDI_ENTRY void
fribidi_shape_arabic (
/* input */
FriBidiFlags flags,
const FriBidiLevel *embedding_levels,
const FriBidiStrIndex len,
/* input and output */
FriBidiArabicProp *ar_props,
FriBidiChar *str
)
{
DBG ("in fribidi_shape_arabic");
if UNLIKELY
(len == 0 || !str) return;
DBG ("in fribidi_shape");
fribidi_assert (ar_props);
if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_PRES))
{
DO_SHAPING (FRIBIDI_GET_ARABIC_SHAPE_PRES, len, ar_props, str);
}
if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_LIGA))
{
DO_LIGATURING (mandatory_liga_table, embedding_levels, len, ar_props, str);
}
if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_CONSOLE))
{
DO_LIGATURING (console_liga_table, embedding_levels, len, ar_props, str);
DO_SHAPING (FRIBIDI_GET_ARABIC_SHAPE_NSM, len, ar_props, str);
}
}
/* Editor directions:
* Local Variables:
* mode: c
* c-basic-offset: 2
* indent-tabs-mode: t
* tab-width: 8
* End:
* vim: textwidth=78: autoindent: cindent: shiftwidth=2: tabstop=8:
*/
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