hb-ot-shaper-myanmar-machine.rl

Enable keyboard shortcuts

/*

 * 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_MYANMAR_MACHINE_HH

#define HB_OT_SHAPER_MYANMAR_MACHINE_HH

#include "hb.hh"

#include "hb-ot-layout.hh"

#include "hb-ot-shaper-indic.hh"

/* buffer var allocations */

#define myanmar_category() ot_shaper_var_u8_category() /* myanmar_category_t */

#define myanmar_position() ot_shaper_var_u8_auxiliary() /* myanmar_position_t */

using myanmar_category_t = unsigned;

using myanmar_position_t = ot_position_t;

#define M_Cat(Cat) myanmar_syllable_machine_ex_##Cat

enum myanmar_syllable_type_t {

  myanmar_consonant_syllable,

  myanmar_broken_cluster,

  myanmar_non_myanmar_cluster,

};

%%{

  machine myanmar_syllable_machine;

  alphtype unsigned char;

  write exports;

  write data;

}%%

%%{

# Spec category D is folded into GB; D0 is not implemented by Uniscribe and as such folded into D

# Spec category P is folded into GB

export C    = 1;

export IV   = 2;

export DB   = 3;	# Dot below	     = OT_N

export H    = 4;

export ZWNJ = 5;

export ZWJ  = 6;

export SM    = 8;	# Visarga and Shan tones

export GB   = 10;	# 		     = OT_PLACEHOLDER

export DOTTEDCIRCLE = 11;

export A    = 9;

export Ra   = 15;

export CS   = 18;

export VAbv = 20;

export VBlw = 21;

export VPre = 22;

export VPst = 23;

# 32+ are for Myanmar-specific values

export As   = 32;	# Asat

export MH   = 35;	# Medial Ha

export MR   = 36;	# Medial Ra

export MW   = 37;	# Medial Wa, Shan Wa

export MY   = 38;	# Medial Ya, Mon Na, Mon Ma

export PT   = 39;	# Pwo and other tones

export VS   = 40;	# Variation selectors

export ML   = 41;	# Medial Mon La

j = ZWJ|ZWNJ;			# Joiners

k = (Ra As H);			# Kinzi

c = C|Ra;			# is_consonant

medial_group = MY? As? MR? ((MW MH? ML? | MH ML? | ML) As?)?;

main_vowel_group = (VPre.VS?)* VAbv* VBlw* A* (DB As?)?;

post_vowel_group = VPst MH? ML? As* VAbv* A* (DB As?)?;

pwo_tone_group = PT A* DB? As?;

complex_syllable_tail = As* medial_group main_vowel_group post_vowel_group* pwo_tone_group* SM* j?;

syllable_tail = (H (c|IV).VS?)* (H | complex_syllable_tail);

consonant_syllable =	(k|CS)? (c|IV|GB|DOTTEDCIRCLE).VS? syllable_tail;

broken_cluster =	k? VS? syllable_tail;

other =			any;

main := |*

	consonant_syllable	=> { found_syllable (myanmar_consonant_syllable); };

	j			=> { found_syllable (myanmar_non_myanmar_cluster); };

	broken_cluster		=> { found_syllable (myanmar_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };

	other			=> { found_syllable (myanmar_non_myanmar_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_myanmar (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].myanmar_category();

}%%

  p = 0;

  pe = eof = buffer->len;

  unsigned int syllable_serial = 1;

%%{

    write exec;

}%%

#undef found_syllable

#endif /* HB_OT_SHAPER_MYANMAR_MACHINE_HH */