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comparison mupdf-source/thirdparty/harfbuzz/src/hb-ot-shaper-khmer-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_KHMER_MACHINE_HH
28 #define HB_OT_SHAPER_KHMER_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 khmer_category() ot_shaper_var_u8_category() /* khmer_category_t */
37
38 using khmer_category_t = unsigned;
39
40 #define K_Cat(Cat) khmer_syllable_machine_ex_##Cat
41
42 enum khmer_syllable_type_t {
43 khmer_consonant_syllable,
44 khmer_broken_cluster,
45 khmer_non_khmer_cluster,
46 };
47
48 %%{
49 machine khmer_syllable_machine;
50 alphtype unsigned char;
51 write exports;
52 write data;
53 }%%
54
55 %%{
56
57
58 # We use category H for spec category Coeng
59
60 export C = 1;
61 export V = 2;
62 export H = 4;
63 export ZWNJ = 5;
64 export ZWJ = 6;
65 export PLACEHOLDER = 10;
66 export DOTTEDCIRCLE = 11;
67 export Ra = 15;
68
69 export VAbv = 20;
70 export VBlw = 21;
71 export VPre = 22;
72 export VPst = 23;
73
74 export Robatic = 25;
75 export Xgroup = 26;
76 export Ygroup = 27;
77
78
79 c = (C | Ra | V);
80 cn = c.((ZWJ|ZWNJ)?.Robatic)?;
81 joiner = (ZWJ | ZWNJ);
82 xgroup = (joiner*.Xgroup)*;
83 ygroup = Ygroup*;
84
85 # This grammar was experimentally extracted from what Uniscribe allows.
86
87 matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
88 syllable_tail = xgroup matra_group xgroup (H.c)? ygroup;
89
90
91 broken_cluster = Robatic? (H.cn)* (H | syllable_tail);
92 consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
93 other = any;
94
95 main := |*
96 consonant_syllable => { found_syllable (khmer_consonant_syllable); };
97 broken_cluster => { found_syllable (khmer_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
98 other => { found_syllable (khmer_non_khmer_cluster); };
99 *|;
100
101
102 }%%
103
104 #define found_syllable(syllable_type) \
105 HB_STMT_START { \
106 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
107 for (unsigned int i = ts; i < te; i++) \
108 info[i].syllable() = (syllable_serial << 4) | syllable_type; \
109 syllable_serial++; \
110 if (syllable_serial == 16) syllable_serial = 1; \
111 } HB_STMT_END
112
113 inline void
114 find_syllables_khmer (hb_buffer_t *buffer)
115 {
116 unsigned int p, pe, eof, ts, te, act HB_UNUSED;
117 int cs;
118 hb_glyph_info_t *info = buffer->info;
119 %%{
120 write init;
121 getkey info[p].khmer_category();
122 }%%
123
124 p = 0;
125 pe = eof = buffer->len;
126
127 unsigned int syllable_serial = 1;
128 %%{
129 write exec;
130 }%%
131 }
132
133 #undef found_syllable
134
135 #endif /* HB_OT_SHAPER_KHMER_MACHINE_HH */