1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
|
/*
* Copyright © 2011,2012 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_OT_SHAPER_KHMER_MACHINE_HH
#define HB_OT_SHAPER_KHMER_MACHINE_HH
#include "hb.hh"
#include "hb-ot-layout.hh"
#include "hb-ot-shaper-indic.hh"
/* buffer var allocations */
#define khmer_category() ot_shaper_var_u8_category() /* khmer_category_t */
using khmer_category_t = unsigned;
#define K_Cat(Cat) khmer_syllable_machine_ex_##Cat
enum khmer_syllable_type_t {
khmer_consonant_syllable,
khmer_broken_cluster,
khmer_non_khmer_cluster,
};
%%{
machine khmer_syllable_machine;
alphtype unsigned char;
write exports;
write data;
}%%
%%{
# We use category H for spec category Coeng
export C = 1;
export V = 2;
export H = 4;
export ZWNJ = 5;
export ZWJ = 6;
export PLACEHOLDER = 10;
export DOTTEDCIRCLE = 11;
export Ra = 15;
export VAbv = 20;
export VBlw = 21;
export VPre = 22;
export VPst = 23;
export Robatic = 25;
export Xgroup = 26;
export Ygroup = 27;
c = (C | Ra | V);
cn = c.((ZWJ|ZWNJ)?.Robatic)?;
joiner = (ZWJ | ZWNJ);
xgroup = (joiner*.Xgroup)*;
ygroup = Ygroup*;
# This grammar was experimentally extracted from what Uniscribe allows.
matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
syllable_tail = xgroup matra_group xgroup (H.c)? ygroup;
broken_cluster = Robatic? (H.cn)* (H | syllable_tail);
consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
other = any;
main := |*
consonant_syllable => { found_syllable (khmer_consonant_syllable); };
broken_cluster => { found_syllable (khmer_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
other => { found_syllable (khmer_non_khmer_cluster); };
*|;
}%%
#define found_syllable(syllable_type) \
HB_STMT_START { \
if (0) fprintf (stderr, "syllable %u..%u %s\n", ts, te, #syllable_type); \
for (unsigned int i = ts; i < te; i++) \
info[i].syllable() = (syllable_serial << 4) | syllable_type; \
syllable_serial++; \
if (syllable_serial == 16) syllable_serial = 1; \
} HB_STMT_END
inline void
find_syllables_khmer (hb_buffer_t *buffer)
{
unsigned int p, pe, eof, ts, te, act HB_UNUSED;
int cs;
hb_glyph_info_t *info = buffer->info;
%%{
write init;
getkey info[p].khmer_category();
}%%
p = 0;
pe = eof = buffer->len;
unsigned int syllable_serial = 1;
%%{
write exec;
}%%
}
#undef found_syllable
#endif /* HB_OT_SHAPER_KHMER_MACHINE_HH */
|
