1 /* fribidi-arabic.c - Arabic shaping
3 * Copyright (C) 2005 Behdad Esfahbod
5 * This file is part of GNU FriBidi.
7 * GNU FriBidi is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public License
9 * as published by the Free Software Foundation; either version 2.1
10 * of the License, or (at your option) any later version.
12 * GNU FriBidi is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU Lesser General Public License for more details.
17 * You should have received a copy of the GNU Lesser General Public License
18 * along with GNU FriBidi; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 * For licensing issues, contact <license@farsiweb.info> or write to
22 * Sharif FarsiWeb, Inc., PO Box 13445-389, Tehran, Iran.
24 /* $Id: fribidi-arabic.c,v 1.3 2007-04-05 16:14:39 behdad Exp $
26 * $Date: 2007-04-05 16:14:39 $
28 * $Source: /home/behdad/src/fdo/fribidi/togit/git/../fribidi/fribidi2/lib/fribidi-arabic.c,v $
31 * Behdad Esfahbod, 2005
41 #include <fribidi-arabic.h>
42 #include <fribidi-unicode.h>
45 typedef struct _PairMap {
46 FriBidiChar pair[2], to;
50 #define FRIBIDI_ACCESS_SHAPE_TABLE(table,min,max,x,shape) (table), (min), (max)
51 # define FRIBIDI_ACCESS_SHAPE_TABLE_REAL(table,min,max,x,shape) \
52 (((x)<(min)||(x)>(max))?(x):(table)[(x)-(min)][(shape)])
54 #include "arabic-shaping.tab.i"
55 #include "arabic-misc.tab.i"
59 fribidi_shape_arabic_joining (
61 const FriBidiChar table[][4],
64 const FriBidiStrIndex len,
65 const FriBidiArabicProp *ar_props,
66 /* input and output */
70 register FriBidiStrIndex i;
72 for (i = 0; i < len; i++)
73 if (FRIBIDI_ARAB_SHAPES(ar_props[i]))
74 str[i] = FRIBIDI_ACCESS_SHAPE_TABLE_REAL (table, min, max, str[i], FRIBIDI_JOIN_SHAPE (ar_props[i]));
80 comp_PairMap (const void *pa, const void *pb)
82 PairMap *a = (PairMap *)pa;
83 PairMap *b = (PairMap *)pb;
85 if (a->pair[0] != b->pair[0])
86 return a->pair[0] < b->pair[0] ? -1 : +1;
88 return a->pair[1] < b->pair[1] ? -1 :
89 a->pair[1] > b->pair[1] ? +1 :
95 find_pair_match (const PairMap *table, int size, FriBidiChar first, FriBidiChar second)
102 match = bsearch (&x, table, size, sizeof (table[0]), comp_PairMap);
103 return match ? match->to : 0;
106 #define PAIR_MATCH(table,len,first,second) \
107 ((first)<(table[0].pair[0])||(first)>(table[len-1].pair[0])?0: \
108 find_pair_match(table, len, first, second))
111 fribidi_shape_arabic_ligature (
113 const PairMap *table,
115 const FriBidiLevel *embedding_levels,
116 const FriBidiStrIndex len,
117 /* input and output */
118 FriBidiArabicProp *ar_props,
122 /* TODO: This doesn't form ligatures for even-level Arabic text.
123 * no big problem though. */
124 register FriBidiStrIndex i;
126 for (i = 0; i < len - 1; i++) {
127 register FriBidiChar c;
128 if (FRIBIDI_LEVEL_IS_RTL(embedding_levels[i]) &&
129 embedding_levels[i] == embedding_levels[i+1] &&
130 (c = PAIR_MATCH(table, size, str[i], str[i+1])))
132 str[i] = FRIBIDI_CHAR_FILL;
133 FRIBIDI_SET_BITS(ar_props[i], FRIBIDI_MASK_LIGATURED);
139 #define DO_LIGATURING(table, levels, len, ar_props, str) \
140 fribidi_shape_arabic_ligature ((table), sizeof(table)/sizeof((table)[0]), levels, len, ar_props, str)
142 #define DO_SHAPING(tablemacro, len, ar_props, str) \
143 fribidi_shape_arabic_joining (tablemacro(,), len, ar_props, str);
149 fribidi_shape_arabic (
152 const FriBidiLevel *embedding_levels,
153 const FriBidiStrIndex len,
154 /* input and output */
155 FriBidiArabicProp *ar_props,
159 DBG ("in fribidi_shape_arabic");
162 (len == 0 || !str) return;
164 DBG ("in fribidi_shape");
166 fribidi_assert (ar_props);
168 if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_PRES))
170 DO_SHAPING (FRIBIDI_GET_ARABIC_SHAPE_PRES, len, ar_props, str);
173 if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_LIGA))
175 DO_LIGATURING (mandatory_liga_table, embedding_levels, len, ar_props, str);
178 if (FRIBIDI_TEST_BITS (flags, FRIBIDI_FLAG_SHAPE_ARAB_CONSOLE))
180 DO_LIGATURING (console_liga_table, embedding_levels, len, ar_props, str);
181 DO_SHAPING (FRIBIDI_GET_ARABIC_SHAPE_NSM, len, ar_props, str);
185 /* Editor directions:
189 * indent-tabs-mode: t
192 * vim: textwidth=78: autoindent: cindent: shiftwidth=2: tabstop=8: