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/*
* 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_SHAPE_COMPLEX_KHMER_MACHINE_HH
#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH
#include "hb.hh"
%%{
machine khmer_syllable_machine;
alphtype unsigned char;
write data;
}%%
%%{
# Same order as enum khmer_category_t. Not sure how to avoid duplication.
C = 1;
V = 2;
ZWNJ = 5;
ZWJ = 6;
PLACEHOLDER = 11;
DOTTEDCIRCLE = 12;
Coeng= 14;
Ra = 16;
Robatic = 20;
Xgroup = 21;
Ygroup = 22;
VAbv = 26;
VBlw = 27;
VPre = 28;
VPst = 29;
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 (Coeng.c)? ygroup;
broken_cluster = (Coeng.cn)* (Coeng | syllable_tail);
consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster;
other = any;
main := |*
consonant_syllable => { found_syllable (consonant_syllable); };
broken_cluster => { found_syllable (broken_cluster); };
other => { found_syllable (non_khmer_cluster); };
*|;
}%%
#define found_syllable(syllable_type) \
HB_STMT_START { \
if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
for (unsigned int i = ts; i < te; i++) \
info[i].syllable() = (syllable_serial << 4) | khmer_##syllable_type; \
syllable_serial++; \
if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
} HB_STMT_END
static 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_SHAPE_COMPLEX_KHMER_MACHINE_HH */
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