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_SHAPE_COMPLEX_KHMER_MACHINE_HH
28#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
29
30#include "hb.hh"
31
32%%{
33  machine khmer_syllable_machine;
34  alphtype unsigned char;
35  write data;
36}%%
37
38%%{
39
40# Same order as enum khmer_category_t.  Not sure how to avoid duplication.
41C    = 1;
42V    = 2;
43ZWNJ = 5;
44ZWJ  = 6;
45PLACEHOLDER = 11;
46DOTTEDCIRCLE = 12;
47Coeng= 14;
48Ra   = 16;
49Robatic = 20;
50Xgroup  = 21;
51Ygroup  = 22;
52VAbv = 26;
53VBlw = 27;
54VPre = 28;
55VPst = 29;
56
57c = (C | Ra | V);
58cn = c.((ZWJ|ZWNJ)?.Robatic)?;
59joiner = (ZWJ | ZWNJ);
60xgroup = (joiner*.Xgroup)*;
61ygroup = Ygroup*;
62
63# This grammar was experimentally extracted from what Uniscribe allows.
64
65matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
66syllable_tail = xgroup matra_group xgroup (Coeng.c)? ygroup;
67
68
69broken_cluster =	(Coeng.cn)* (Coeng | syllable_tail);
70consonant_syllable =	(cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
71other =			any;
72
73main := |*
74	consonant_syllable	=> { found_syllable (consonant_syllable); };
75	broken_cluster		=> { found_syllable (broken_cluster); };
76	other			=> { found_syllable (non_khmer_cluster); };
77*|;
78
79
80}%%
81
82#define found_syllable(syllable_type) \
83  HB_STMT_START { \
84    if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
85    for (unsigned int i = ts; i < te; i++) \
86      info[i].syllable() = (syllable_serial << 4) | khmer_##syllable_type; \
87    syllable_serial++; \
88    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
89  } HB_STMT_END
90
91static void
92find_syllables_khmer (hb_buffer_t *buffer)
93{
94  unsigned int p, pe, eof, ts, te, act HB_UNUSED;
95  int cs;
96  hb_glyph_info_t *info = buffer->info;
97  %%{
98    write init;
99    getkey info[p].khmer_category();
100  }%%
101
102  p = 0;
103  pe = eof = buffer->len;
104
105  unsigned int syllable_serial = 1;
106  %%{
107    write exec;
108  }%%
109}
110
111#undef found_syllable
112
113#endif /* HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH */
114