/*

 * 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_INDIC_MACHINE_HH

#define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH

#include "hb-private.hh"

%%{

  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;

V    = 2;

N    = 3;

H    = 4;

ZWNJ = 5;

ZWJ  = 6;

M    = 7;

SM   = 8;

VD   = 9;

A    = 10;

PLACEHOLDER = 11;

DOTTEDCIRCLE = 12;

RS    = 13;

Coeng = 14;

Repha = 15;

Ra    = 16;

CM    = 17;

Symbol= 18;

c = (C | Ra);			# is_consonant

n = ((ZWNJ?.RS)? (N.N?)?);	# is_consonant_modifier

z = ZWJ|ZWNJ;			# is_joiner

h = H | Coeng;			# is_halant_or_coeng

reph = (Ra H | Repha);		# possible reph

cn = c.ZWJ?.n?;

forced_rakar = ZWJ H ZWJ Ra;

symbol = Symbol.N?;

matra_group = z{0,3}.M.N?.(H | forced_rakar)?;

syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}? VD{0,2};

place_holder = PLACEHOLDER | DOTTEDCIRCLE;

halant_group = (z?.h.(ZWJ.N?)?);

final_halant_group = halant_group | h.ZWNJ;

medial_group = CM?;

halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4}) (Coeng (cn|V))?;

consonant_syllable =	Repha? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail;

vowel_syllable =	reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail);

standalone_cluster =	(Repha? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;

symbol_cluster = 	symbol syllable_tail;

broken_cluster =	reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;

other =			any;

main := |*

	consonant_syllable	=> { found_syllable (consonant_syllable); };

	vowel_syllable		=> { found_syllable (vowel_syllable); };

	standalone_cluster	=> { found_syllable (standalone_cluster); };

	symbol_cluster		=> { found_syllable (symbol_cluster); };

	broken_cluster		=> { found_syllable (broken_cluster); };

	other			=> { found_syllable (non_indic_cluster); };

*|;

}%%

#define found_syllable(syllable_type) \

  HB_STMT_START { \

    if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \

    for (unsigned int i = last; i < p+1; i++) \

      info[i].syllable() = (syllable_serial << 4) | syllable_type; \

    last = p+1; \

    syllable_serial++; \

    if (unlikely (syllable_serial == 16)) syllable_serial = 1; \

  } HB_STMT_END

static void

find_syllables (hb_buffer_t *buffer)

{

  unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;

  int cs;

  hb_glyph_info_t *info = buffer->info;

  %%{

    write init;

    getkey info[p].indic_category();

  }%%

  p = 0;

  pe = eof = buffer->len;

  unsigned int last = 0;

  unsigned int syllable_serial = 1;

  %%{

    write exec;

  }%%

}

#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */