harfbuzz/src/hb-ot-shaper-khmer-machine.rl

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Ragel

/*
* 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 */