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comparison mupdf-source/thirdparty/harfbuzz/src/hb-ot-shaper-indic-machine.rl @ 2:b50eed0cc0ef upstream

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ADD: MuPDF v1.26.7: the MuPDF source as downloaded by a default build of PyMuPDF 1.26.4. The directory name has changed: no version number in the expanded directory now.
author Franz Glasner <fzglas.hg@dom66.de>
date Mon, 15 Sep 2025 11:43:07 +0200
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1:1d09e1dec1d9 2:b50eed0cc0ef
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_SHAPER_INDIC_MACHINE_HH
28 #define HB_OT_SHAPER_INDIC_MACHINE_HH
29
30 #include "hb.hh"
31
32 #include "hb-ot-layout.hh"
33 #include "hb-ot-shaper-indic.hh"
34
35 /* buffer var allocations */
36 #define indic_category() ot_shaper_var_u8_category() /* indic_category_t */
37 #define indic_position() ot_shaper_var_u8_auxiliary() /* indic_position_t */
38
39 using indic_category_t = unsigned;
40 using indic_position_t = ot_position_t;
41
42 #define I_Cat(Cat) indic_syllable_machine_ex_##Cat
43
44 enum indic_syllable_type_t {
45 indic_consonant_syllable,
46 indic_vowel_syllable,
47 indic_standalone_cluster,
48 indic_symbol_cluster,
49 indic_broken_cluster,
50 indic_non_indic_cluster,
51 };
52
53 %%{
54 machine indic_syllable_machine;
55 alphtype unsigned char;
56 write exports;
57 write data;
58 }%%
59
60 %%{
61
62
63 export X = 0;
64 export C = 1;
65 export V = 2;
66 export N = 3;
67 export H = 4;
68 export ZWNJ = 5;
69 export ZWJ = 6;
70 export M = 7;
71 export SM = 8;
72 export A = 9;
73 export VD = 9;
74 export PLACEHOLDER = 10;
75 export DOTTEDCIRCLE = 11;
76 export RS = 12;
77 export MPst = 13;
78 export Repha = 14;
79 export Ra = 15;
80 export CM = 16;
81 export Symbol= 17;
82 export CS = 18;
83
84
85 c = (C | Ra); # is_consonant
86 n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier
87 z = ZWJ|ZWNJ; # is_joiner
88 reph = (Ra H | Repha); # possible reph
89
90 cn = c.ZWJ?.n?;
91 symbol = Symbol.N?;
92 matra_group = z*.(M | SM? MPst).N?.H?;
93 syllable_tail = (z?.SM.SM?.ZWNJ?)? (A | VD)*;
94 halant_group = (z?.H.(ZWJ.N?)?);
95 final_halant_group = halant_group | H.ZWNJ;
96 medial_group = CM?;
97 halant_or_matra_group = (final_halant_group | matra_group*);
98
99 complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail;
100
101 consonant_syllable = (Repha|CS)? cn complex_syllable_tail;
102 vowel_syllable = reph? V.n? (ZWJ | complex_syllable_tail);
103 standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? complex_syllable_tail;
104 symbol_cluster = symbol syllable_tail;
105 broken_cluster = reph? n? complex_syllable_tail;
106 other = any;
107
108 main := |*
109 consonant_syllable => { found_syllable (indic_consonant_syllable); };
110 vowel_syllable => { found_syllable (indic_vowel_syllable); };
111 standalone_cluster => { found_syllable (indic_standalone_cluster); };
112 symbol_cluster => { found_syllable (indic_symbol_cluster); };
113 broken_cluster => { found_syllable (indic_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
114 other => { found_syllable (indic_non_indic_cluster); };
115 *|;
116
117
118 }%%
119
120 #define found_syllable(syllable_type) \
121 HB_STMT_START { \
122 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
123 for (unsigned int i = ts; i < te; i++) \
124 info[i].syllable() = (syllable_serial << 4) | syllable_type; \
125 syllable_serial++; \
126 if (syllable_serial == 16) syllable_serial = 1; \
127 } HB_STMT_END
128
129 inline void
130 find_syllables_indic (hb_buffer_t *buffer)
131 {
132 unsigned int p, pe, eof, ts, te, act;
133 int cs;
134 hb_glyph_info_t *info = buffer->info;
135 %%{
136 write init;
137 getkey info[p].indic_category();
138 }%%
139
140 p = 0;
141 pe = eof = buffer->len;
142
143 unsigned int syllable_serial = 1;
144 %%{
145 write exec;
146 }%%
147 }
148
149 #undef found_syllable
150
151 #endif /* HB_OT_SHAPER_INDIC_MACHINE_HH */