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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.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
47IND	= 3; # BASE_IND
48N	= 4; # BASE_NUM
49GB	= 5; # BASE_OTHER
50CGJ	= 6; # CGJ
51#F	= 7; # CONS_FINAL
52FM	= 8; # CONS_FINAL_MOD
53#M	= 9; # CONS_MED
54#CM	= 10; # CONS_MOD
55SUB	= 11; # CONS_SUB
56H	= 12; # HALANT
57
58HN	= 13; # HALANT_NUM
59ZWNJ	= 14; # Zero width non-joiner
60ZWJ	= 15; # Zero width joiner
61WJ	= 16; # Word joiner
62Rsv	= 17; # Reserved characters
63R	= 18; # REPHA
64S	= 19; # SYM
65#SM	= 20; # SYM_MOD
66VS	= 21; # VARIATION_SELECTOR
67#V	= 36; # VOWEL
68#VM	= 40; # VOWEL_MOD
69
70FAbv	= 24; # CONS_FINAL_ABOVE
71FBlw	= 25; # CONS_FINAL_BELOW
72FPst	= 26; # CONS_FINAL_POST
73MAbv	= 27; # CONS_MED_ABOVE
74MBlw	= 28; # CONS_MED_BELOW
75MPst	= 29; # CONS_MED_POST
76MPre	= 30; # CONS_MED_PRE
77CMAbv	= 31; # CONS_MOD_ABOVE
78CMBlw	= 32; # CONS_MOD_BELOW
79VAbv	= 33; # VOWEL_ABOVE / VOWEL_ABOVE_BELOW / VOWEL_ABOVE_BELOW_POST / VOWEL_ABOVE_POST
80VBlw	= 34; # VOWEL_BELOW / VOWEL_BELOW_POST
81VPst	= 35; # VOWEL_POST	UIPC = Right
82VPre	= 22; # VOWEL_PRE / VOWEL_PRE_ABOVE / VOWEL_PRE_ABOVE_POST / VOWEL_PRE_POST
83VMAbv	= 37; # VOWEL_MOD_ABOVE
84VMBlw	= 38; # VOWEL_MOD_BELOW
85VMPst	= 39; # VOWEL_MOD_POST
86VMPre	= 23; # VOWEL_MOD_PRE
87SMAbv	= 41; # SYM_MOD_ABOVE
88SMBlw	= 42; # SYM_MOD_BELOW
89CS	= 43; # CONS_WITH_STACKER
90
91HVM	= 44; # HALANT_OR_VOWEL_MODIFIER
92
93h = H | HVM; # https://github.com/harfbuzz/harfbuzz/issues/1102
94
95# Override: Adhoc ZWJ placement. https://github.com/harfbuzz/harfbuzz/issues/542#issuecomment-353169729
96consonant_modifiers = CMAbv* CMBlw* ((ZWJ?.h.ZWJ? B | SUB) VS? CMAbv? CMBlw*)*;
97# Override: Allow two MBlw. https://github.com/harfbuzz/harfbuzz/issues/376
98medial_consonants = MPre? MAbv? MBlw?.MBlw? MPst?;
99dependent_vowels = VPre* VAbv* VBlw* VPst*;
100vowel_modifiers = HVM? VMPre* VMAbv* VMBlw* VMPst*;
101final_consonants = FAbv* FBlw* FPst* FM?;
102
103complex_syllable_tail =
104	consonant_modifiers
105	medial_consonants
106	dependent_vowels
107	vowel_modifiers
108	final_consonants
109;
110
111virama_terminated_cluster =
112	(R|CS)? (B | GB) VS?
113	consonant_modifiers
114	ZWJ?.h.ZWJ?
115;
116standard_cluster =
117	(R|CS)? (B | GB) VS?
118	complex_syllable_tail
119;
120broken_cluster =
121	R?
122	complex_syllable_tail
123;
124
125number_joiner_terminated_cluster = N VS? (HN N VS?)* HN;
126numeral_cluster = N VS? (HN N VS?)*;
127symbol_cluster = S VS? SMAbv* SMBlw*;
128independent_cluster = (IND | O | Rsv | WJ) VS?;
129other = any;
130
131main := |*
132	independent_cluster			=> { found_syllable (independent_cluster); };
133	virama_terminated_cluster		=> { found_syllable (virama_terminated_cluster); };
134	standard_cluster			=> { found_syllable (standard_cluster); };
135	number_joiner_terminated_cluster	=> { found_syllable (number_joiner_terminated_cluster); };
136	numeral_cluster				=> { found_syllable (numeral_cluster); };
137	symbol_cluster				=> { found_syllable (symbol_cluster); };
138	broken_cluster				=> { found_syllable (broken_cluster); };
139	other					=> { found_syllable (non_cluster); };
140*|;
141
142
143}%%
144
145#define found_syllable(syllable_type) \
146  HB_STMT_START { \
147    if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
148    for (unsigned int i = ts; i < te; i++) \
149      info[i].syllable() = (syllable_serial << 4) | syllable_type; \
150    syllable_serial++; \
151    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
152  } HB_STMT_END
153
154static void
155find_syllables (hb_buffer_t *buffer)
156{
157  unsigned int p, pe, eof, ts, te, act;
158  int cs;
159  hb_glyph_info_t *info = buffer->info;
160  %%{
161    write init;
162    getkey info[p].use_category();
163  }%%
164
165  p = 0;
166  pe = eof = buffer->len;
167
168  unsigned int syllable_serial = 1;
169  %%{
170    write exec;
171  }%%
172}
173
174#undef found_syllable
175
176#endif /* HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH */
177