1/*
2 * Copyright © 2015  Mozilla Foundation.
3 * Copyright © 2015  Google, Inc.
4 *
5 *  This is part of HarfBuzz, a text shaping library.
6 *
7 * Permission is hereby granted, without written agreement and without
8 * license or royalty fees, to use, copy, modify, and distribute this
9 * software and its documentation for any purpose, provided that the
10 * above copyright notice and the following two paragraphs appear in
11 * all copies of this software.
12 *
13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
17 * DAMAGE.
18 *
19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
21 * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
24 *
25 * Mozilla Author(s): Jonathan Kew
26 * Google Author(s): Behdad Esfahbod
27 */
28
29#ifndef HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH
30#define HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH
31
32#include "hb-private.hh"
33
34%%{
35  machine use_syllable_machine;
36  alphtype unsigned char;
37  write data;
38}%%
39
40%%{
41
42# Same order as enum use_category_t.  Not sure how to avoid duplication.
43
44O	= 0; # OTHER
45
46B	= 1; # BASE
47IV	= 2; # BASE_VOWEL
48IND	= 3; # BASE_IND
49N	= 4; # BASE_NUM
50GB	= 5; # BASE_OTHER
51CGJ	= 6; # CGJ
52#F	= 7; # CONS_FINAL
53FM	= 8; # CONS_FINAL_MOD
54#M	= 9; # CONS_MED
55#CM	= 10; # CONS_MOD
56SUB	= 11; # CONS_SUB
57H	= 12; # HALANT
58
59HN	= 13; # HALANT_NUM
60ZWNJ	= 14; # Zero width non-joiner
61ZWJ	= 15; # Zero width joiner
62WJ	= 16; # Word joiner
63Rsv	= 17; # Reserved characters
64R	= 18; # REPHA
65S	= 19; # SYM
66#SM	= 20; # SYM_MOD
67VS	= 21; # VARIATION_SELECTOR
68#V	= 36; # VOWEL
69#VM	= 40; # VOWEL_MOD
70
71FAbv	= 24; # CONS_FINAL_ABOVE
72FBlw	= 25; # CONS_FINAL_BELOW
73FPst	= 26; # CONS_FINAL_POST
74MAbv	= 27; # CONS_MED_ABOVE
75MBlw	= 28; # CONS_MED_BELOW
76MPst	= 29; # CONS_MED_POST
77MPre	= 30; # CONS_MED_PRE
78CMAbv	= 31; # CONS_MOD_ABOVE
79CMBlw	= 32; # CONS_MOD_BELOW
80VAbv	= 33; # VOWEL_ABOVE / VOWEL_ABOVE_BELOW / VOWEL_ABOVE_BELOW_POST / VOWEL_ABOVE_POST
81VBlw	= 34; # VOWEL_BELOW / VOWEL_BELOW_POST
82VPst	= 35; # VOWEL_POST	UIPC = Right
83VPre	= 22; # VOWEL_PRE / VOWEL_PRE_ABOVE / VOWEL_PRE_ABOVE_POST / VOWEL_PRE_POST
84VMAbv	= 37; # VOWEL_MOD_ABOVE
85VMBlw	= 38; # VOWEL_MOD_BELOW
86VMPst	= 39; # VOWEL_MOD_POST
87VMPre	= 23; # VOWEL_MOD_PRE
88SMAbv	= 41; # SYM_MOD_ABOVE
89SMBlw	= 42; # SYM_MOD_BELOW
90
91
92consonant_modifiers = CMAbv* CMBlw* ((H B | SUB) VS? CMAbv? CMBlw*)*;
93medial_consonants = MPre? MAbv? MBlw? MPst?;
94dependent_vowels = VPre* VAbv* VBlw* VPst*;
95vowel_modifiers = VMPre* VMAbv* VMBlw* VMPst*;
96final_consonants = FAbv* FBlw* FPst* FM?;
97
98virama_terminated_cluster =
99	R? (B | GB | IV) VS?
100	consonant_modifiers
101	H
102;
103consonant_cluster =
104	R? (B | GB) VS?
105	consonant_modifiers
106	medial_consonants
107	dependent_vowels
108	vowel_modifiers
109	final_consonants
110;
111vowel_cluster =
112	R? (IV) VS?
113	consonant_modifiers
114	medial_consonants
115	vowel_modifiers
116	final_consonants
117;
118
119broken_cluster =
120	R?
121	consonant_modifiers
122	medial_consonants
123	dependent_vowels
124	vowel_modifiers
125	final_consonants
126;
127
128number_joiner_terminated_cluster = N VS? (HN N VS?)* H;
129numeral_cluster = N VS? (HN N VS?)*;
130symbol_cluster = S VS? SMAbv* SMBlw*;
131independent_cluster = (IND | O | Rsv | WJ) VS?;
132
133main := |*
134	independent_cluster			=> { found_syllable (independent_cluster); };
135	virama_terminated_cluster		=> { found_syllable (virama_terminated_cluster); };
136	consonant_cluster			=> { found_syllable (consonant_cluster); };
137	vowel_cluster				=> { found_syllable (vowel_cluster); };
138	number_joiner_terminated_cluster	=> { found_syllable (number_joiner_terminated_cluster); };
139	numeral_cluster				=> { found_syllable (numeral_cluster); };
140	symbol_cluster				=> { found_syllable (symbol_cluster); };
141	broken_cluster				=> { found_syllable (broken_cluster); };
142*|;
143
144
145}%%
146
147#define found_syllable(syllable_type) \
148  HB_STMT_START { \
149    if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
150    for (unsigned int i = last; i < p+1; i++) \
151      info[i].syllable() = (syllable_serial << 4) | syllable_type; \
152    last = p+1; \
153    syllable_serial++; \
154    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
155  } HB_STMT_END
156
157static void
158find_syllables (hb_buffer_t *buffer)
159{
160  unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
161  int cs;
162  hb_glyph_info_t *info = buffer->info;
163  %%{
164    write init;
165    getkey info[p].use_category();
166  }%%
167
168  p = 0;
169  pe = eof = buffer->len;
170
171  unsigned int last = 0;
172  unsigned int syllable_serial = 1;
173  %%{
174    write exec;
175  }%%
176}
177
178#undef found_syllable
179
180#endif /* HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH */
181