f6b814b1df02b387efec5fbc3c904bf4a8434a04
[platform/upstream/harfbuzz.git] / src / hb-ot-shape-complex-use-machine.rl
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
44 O       = 0; # OTHER
45
46 B       = 1; # BASE
47 IND     = 3; # BASE_IND
48 N       = 4; # BASE_NUM
49 GB      = 5; # BASE_OTHER
50 CGJ     = 6; # CGJ
51 #F      = 7; # CONS_FINAL
52 FM      = 8; # CONS_FINAL_MOD
53 #M      = 9; # CONS_MED
54 #CM     = 10; # CONS_MOD
55 SUB     = 11; # CONS_SUB
56 H       = 12; # HALANT
57
58 HN      = 13; # HALANT_NUM
59 ZWNJ    = 14; # Zero width non-joiner
60 ZWJ     = 15; # Zero width joiner
61 WJ      = 16; # Word joiner
62 Rsv     = 17; # Reserved characters
63 R       = 18; # REPHA
64 S       = 19; # SYM
65 #SM     = 20; # SYM_MOD
66 VS      = 21; # VARIATION_SELECTOR
67 #V      = 36; # VOWEL
68 #VM     = 40; # VOWEL_MOD
69
70 FAbv    = 24; # CONS_FINAL_ABOVE
71 FBlw    = 25; # CONS_FINAL_BELOW
72 FPst    = 26; # CONS_FINAL_POST
73 MAbv    = 27; # CONS_MED_ABOVE
74 MBlw    = 28; # CONS_MED_BELOW
75 MPst    = 29; # CONS_MED_POST
76 MPre    = 30; # CONS_MED_PRE
77 CMAbv   = 31; # CONS_MOD_ABOVE
78 CMBlw   = 32; # CONS_MOD_BELOW
79 VAbv    = 33; # VOWEL_ABOVE / VOWEL_ABOVE_BELOW / VOWEL_ABOVE_BELOW_POST / VOWEL_ABOVE_POST
80 VBlw    = 34; # VOWEL_BELOW / VOWEL_BELOW_POST
81 VPst    = 35; # VOWEL_POST      UIPC = Right
82 VPre    = 22; # VOWEL_PRE / VOWEL_PRE_ABOVE / VOWEL_PRE_ABOVE_POST / VOWEL_PRE_POST
83 VMAbv   = 37; # VOWEL_MOD_ABOVE
84 VMBlw   = 38; # VOWEL_MOD_BELOW
85 VMPst   = 39; # VOWEL_MOD_POST
86 VMPre   = 23; # VOWEL_MOD_PRE
87 SMAbv   = 41; # SYM_MOD_ABOVE
88 SMBlw   = 42; # SYM_MOD_BELOW
89
90
91 consonant_modifiers = CMAbv* CMBlw* ((H B | SUB) VS? CMAbv? CMBlw*)*;
92 medial_consonants = MPre? MAbv? MBlw? MPst?;
93 dependent_vowels = VPre* VAbv* VBlw* VPst*;
94 vowel_modifiers = VMPre* VMAbv* VMBlw* VMPst*;
95 final_consonants = FAbv* FBlw* FPst* FM?;
96
97 virama_terminated_cluster =
98         R? (B | GB) VS?
99         consonant_modifiers
100         H
101 ;
102 standard_cluster =
103         R? (B | GB) VS?
104         consonant_modifiers
105         medial_consonants
106         dependent_vowels
107         vowel_modifiers
108         final_consonants
109 ;
110
111 broken_cluster =
112         R?
113         consonant_modifiers
114         medial_consonants
115         dependent_vowels
116         vowel_modifiers
117         final_consonants
118 ;
119
120 number_joiner_terminated_cluster = N VS? (HN N VS?)* HN;
121 numeral_cluster = N VS? (HN N VS?)*;
122 symbol_cluster = S VS? SMAbv* SMBlw*;
123 independent_cluster = (IND | O | Rsv | WJ) VS?;
124 other = any;
125
126 main := |*
127         independent_cluster                     => { found_syllable (independent_cluster); };
128         virama_terminated_cluster               => { found_syllable (virama_terminated_cluster); };
129         standard_cluster                        => { found_syllable (standard_cluster); };
130         number_joiner_terminated_cluster        => { found_syllable (number_joiner_terminated_cluster); };
131         numeral_cluster                         => { found_syllable (numeral_cluster); };
132         symbol_cluster                          => { found_syllable (symbol_cluster); };
133         broken_cluster                          => { found_syllable (broken_cluster); };
134         other                                   => { found_syllable (non_cluster); };
135 *|;
136
137
138 }%%
139
140 #define found_syllable(syllable_type) \
141   HB_STMT_START { \
142     if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
143     for (unsigned int i = last; i < p+1; i++) \
144       info[i].syllable() = (syllable_serial << 4) | syllable_type; \
145     last = p+1; \
146     syllable_serial++; \
147     if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
148   } HB_STMT_END
149
150 static void
151 find_syllables (hb_buffer_t *buffer)
152 {
153   unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
154   int cs;
155   hb_glyph_info_t *info = buffer->info;
156   %%{
157     write init;
158     getkey info[p].use_category();
159   }%%
160
161   p = 0;
162   pe = eof = buffer->len;
163
164   unsigned int last = 0;
165   unsigned int syllable_serial = 1;
166   %%{
167     write exec;
168   }%%
169 }
170
171 #undef found_syllable
172
173 #endif /* HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH */