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/*
* Copyright © 2011 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_INDIC_MACHINE_HH
#define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH
#include "hb-private.hh"
HB_BEGIN_DECLS
%%{
machine indic_syllable_machine;
alphtype unsigned char;
write data;
}%%
%%{
# Same order as enum indic_category_t. Not sure how to avoid duplication.
X = 0;
C = 1;
Ra = 2;
V = 3;
N = 4;
H = 5;
ZWNJ = 6;
ZWJ = 7;
M = 8;
SM = 9;
VD = 10;
A = 11;
NBSP = 12;
c = C | Ra;
z = ZWJ|ZWNJ;
matra_group = M N? H?;
syllable_tail = SM? (VD VD?)?;
action found_consonant_syllable { found_consonant_syllable (map, buffer, mask_array, last, p); }
action found_vowel_syllable { found_vowel_syllable (map, buffer, mask_array, last, p); }
action found_standalone_cluster { found_standalone_cluster (map, buffer, mask_array, last, p); }
action found_non_indic { found_non_indic (map, buffer, mask_array, last, p); }
action next_syllable { set_cluster (buffer, p, last); last = p; }
consonant_syllable = (c.N? (z.H|H.z?))* c.N? A? (H.z? | matra_group*)? syllable_tail %(found_consonant_syllable);
vowel_syllable = (Ra H)? V N? (z.H.c | ZWJ.c)? matra_group* syllable_tail %(found_vowel_syllable);
standalone_cluster = (Ra H)? NBSP N? (z? H c)? matra_group* syllable_tail %(found_standalone_cluster);
non_indic = X %(found_non_indic);
syllable =
consonant_syllable
| vowel_syllable
| standalone_cluster
| non_indic
;
main := (syllable %(next_syllable))**;
}%%
static void
set_cluster (hb_buffer_t *buffer,
unsigned int start, unsigned int end)
{
unsigned int cluster = buffer->info[start].cluster;
for (unsigned int i = start + 1; i < end; i++)
cluster = MIN (cluster, buffer->info[i].cluster);
for (unsigned int i = start; i < end; i++)
buffer->info[i].cluster = cluster;
}
static void
find_syllables (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array)
{
unsigned int p, pe, eof;
int cs;
%%{
write init;
getkey buffer->info[p].indic_category();
}%%
p = 0;
pe = eof = buffer->len;
unsigned int last = 0;
%%{
write exec;
}%%
}
HB_END_DECLS
#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */
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