1/*
2 * Copyright © 2011,2012  Google, Inc.
3 *
4 *  This is part of HarfBuzz, a text shaping library.
5 *
6 * Permission is hereby granted, without written agreement and without
7 * license or royalty fees, to use, copy, modify, and distribute this
8 * software and its documentation for any purpose, provided that the
9 * above copyright notice and the following two paragraphs appear in
10 * all copies of this software.
11 *
12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
16 * DAMAGE.
17 *
18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
20 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
23 *
24 * Google Author(s): Behdad Esfahbod
25 */
26
27#ifndef HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH
28#define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH
29
30#include "hb-private.hh"
31
32%%{
33  machine indic_syllable_machine;
34  alphtype unsigned char;
35  write data;
36}%%
37
38%%{
39
40# Same order as enum indic_category_t.  Not sure how to avoid duplication.
41X    = 0;
42C    = 1;
43V    = 2;
44N    = 3;
45H    = 4;
46ZWNJ = 5;
47ZWJ  = 6;
48M    = 7;
49SM   = 8;
50VD   = 9;
51A    = 10;
52NBSP = 11;
53DOTTEDCIRCLE = 12;
54RS   = 13;
55Coeng = 14;
56Repha = 15;
57Ra    = 16;
58CM    = 17;
59
60c = (C | Ra)CM*;		# is_consonant
61n = ((ZWNJ?.RS)? (N.N?)?);	# is_consonant_modifier
62z = ZWJ|ZWNJ;			# is_joiner
63h = H | Coeng;			# is_halant_or_coeng
64reph = (Ra H | Repha);		# possible reph
65
66cn = c.ZWJ?.n?;
67forced_rakar = ZWJ H ZWJ Ra;
68matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
69syllable_tail =  (Coeng (cn|V))? (SM.ZWNJ?)? (VD VD?)?;
70place_holder = NBSP | DOTTEDCIRCLE;
71halant_group = (z?.h.(ZWJ.N?)?);
72final_halant_group = halant_group | h.ZWNJ;
73halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4});
74
75
76consonant_syllable =	Repha? (cn.halant_group){0,4} cn A? halant_or_matra_group? syllable_tail;
77vowel_syllable =	reph? V.n? (ZWJ | (halant_group.cn){0,4} halant_or_matra_group? syllable_tail);
78standalone_cluster =	reph? place_holder.n? (halant_group.cn){0,4} halant_or_matra_group? syllable_tail;
79broken_cluster =	reph? n? (halant_group.cn){0,4} halant_or_matra_group syllable_tail;
80other =			any;
81
82main := |*
83	consonant_syllable	=> { found_syllable (consonant_syllable); };
84	vowel_syllable		=> { found_syllable (vowel_syllable); };
85	standalone_cluster	=> { found_syllable (standalone_cluster); };
86	broken_cluster		=> { found_syllable (broken_cluster); };
87	other			=> { found_syllable (non_indic_cluster); };
88*|;
89
90
91}%%
92
93#define found_syllable(syllable_type) \
94  HB_STMT_START { \
95    if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
96    for (unsigned int i = last; i < p+1; i++) \
97      info[i].syllable() = (syllable_serial << 4) | syllable_type; \
98    last = p+1; \
99    syllable_serial++; \
100    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
101  } HB_STMT_END
102
103static void
104find_syllables (hb_buffer_t *buffer)
105{
106  unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
107  int cs;
108  hb_glyph_info_t *info = buffer->info;
109  %%{
110    write init;
111    getkey info[p].indic_category();
112  }%%
113
114  p = 0;
115  pe = eof = buffer->len;
116
117  unsigned int last = 0;
118  unsigned int syllable_serial = 1;
119  %%{
120    write exec;
121  }%%
122}
123
124#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */
125