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;
52PLACEHOLDER = 11;
53DOTTEDCIRCLE = 12;
54RS    = 13;
55Coeng = 14;
56Repha = 15;
57Ra    = 16;
58CM    = 17;
59Symbol= 18;
60CM2   = 31;
61
62c = (C | Ra);			# is_consonant
63n = ((ZWNJ?.RS)? (N.N?)?);	# is_consonant_modifier
64z = ZWJ|ZWNJ;			# is_joiner
65h = H | Coeng;			# is_halant_or_coeng
66reph = (Ra H | Repha);		# possible reph
67
68cn = c.ZWJ?.n?;
69forced_rakar = ZWJ H ZWJ Ra;
70symbol = Symbol.N?;
71matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
72syllable_tail = (SM.SM?.ZWNJ?)? A{0,3}? VD{0,2};
73place_holder = PLACEHOLDER | DOTTEDCIRCLE;
74halant_group = (z?.h.(ZWJ.N?)?);
75final_halant_group = halant_group | h.ZWNJ;
76medial_group = CM?.CM2?;
77halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4}) (Coeng (cn|V))?;
78
79
80consonant_syllable =	Repha? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail;
81vowel_syllable =	reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail);
82standalone_cluster =	(Repha? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
83symbol_cluster = 	symbol syllable_tail;
84broken_cluster =	reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
85other =			any;
86
87main := |*
88	consonant_syllable	=> { found_syllable (consonant_syllable); };
89	vowel_syllable		=> { found_syllable (vowel_syllable); };
90	standalone_cluster	=> { found_syllable (standalone_cluster); };
91	symbol_cluster		=> { found_syllable (symbol_cluster); };
92	broken_cluster		=> { found_syllable (broken_cluster); };
93	other			=> { found_syllable (non_indic_cluster); };
94*|;
95
96
97}%%
98
99#define found_syllable(syllable_type) \
100  HB_STMT_START { \
101    if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
102    for (unsigned int i = last; i < p+1; i++) \
103      info[i].syllable() = (syllable_serial << 4) | syllable_type; \
104    last = p+1; \
105    syllable_serial++; \
106    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
107  } HB_STMT_END
108
109static void
110find_syllables (hb_buffer_t *buffer)
111{
112  unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
113  int cs;
114  hb_glyph_info_t *info = buffer->info;
115  %%{
116    write init;
117    getkey info[p].indic_category();
118  }%%
119
120  p = 0;
121  pe = eof = buffer->len;
122
123  unsigned int last = 0;
124  unsigned int syllable_serial = 1;
125  %%{
126    write exec;
127  }%%
128}
129
130#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */
131