2 * Copyright © 2011,2012 Google, Inc.
4 * This is part of HarfBuzz, a text shaping library.
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.
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
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.
24 * Google Author(s): Behdad Esfahbod
27 #ifndef HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
28 #define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
32 enum khmer_syllable_type_t {
33 khmer_consonant_syllable,
35 khmer_non_khmer_cluster,
39 machine khmer_syllable_machine;
40 alphtype unsigned char;
51 export PLACEHOLDER = 11;
52 export DOTTEDCIRCLE = 12;
64 cn = c.((ZWJ|ZWNJ)?.Robatic)?;
65 joiner = (ZWJ | ZWNJ);
66 xgroup = (joiner*.Xgroup)*;
69 # This grammar was experimentally extracted from what Uniscribe allows.
71 matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?;
72 syllable_tail = xgroup matra_group xgroup (Coeng.c)? ygroup;
75 broken_cluster = (Coeng.cn)* (Coeng | syllable_tail);
76 consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
80 consonant_syllable => { found_syllable (khmer_consonant_syllable); };
81 broken_cluster => { found_syllable (khmer_broken_cluster); };
82 other => { found_syllable (khmer_non_khmer_cluster); };
88 #define found_syllable(syllable_type) \
90 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
91 for (unsigned int i = ts; i < te; i++) \
92 info[i].syllable() = (syllable_serial << 4) | syllable_type; \
94 if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
98 find_syllables_khmer (hb_buffer_t *buffer)
100 unsigned int p, pe, eof, ts, te, act HB_UNUSED;
102 hb_glyph_info_t *info = buffer->info;
105 getkey info[p].khmer_category();
109 pe = eof = buffer->len;
111 unsigned int syllable_serial = 1;
117 #undef found_syllable
119 #endif /* HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH */