151 lines
4.2 KiB
Ragel
151 lines
4.2 KiB
Ragel
/*
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* Copyright © 2011,2012 Google, Inc.
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*
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* This is part of HarfBuzz, a text shaping library.
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*
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* Permission is hereby granted, without written agreement and without
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* license or royalty fees, to use, copy, modify, and distribute this
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* software and its documentation for any purpose, provided that the
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* above copyright notice and the following two paragraphs appear in
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* all copies of this software.
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*
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* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
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* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
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* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
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* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
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* DAMAGE.
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*
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* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
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* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
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* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
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* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*
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* Google Author(s): Behdad Esfahbod
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*/
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#ifndef HB_OT_SHAPER_MYANMAR_MACHINE_HH
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#define HB_OT_SHAPER_MYANMAR_MACHINE_HH
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#include "hb.hh"
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#include "hb-ot-layout.hh"
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#include "hb-ot-shaper-indic.hh"
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/* buffer var allocations */
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#define myanmar_category() ot_shaper_var_u8_category() /* myanmar_category_t */
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#define myanmar_position() ot_shaper_var_u8_auxiliary() /* myanmar_position_t */
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using myanmar_category_t = unsigned;
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using myanmar_position_t = ot_position_t;
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#define M_Cat(Cat) myanmar_syllable_machine_ex_##Cat
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enum myanmar_syllable_type_t {
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myanmar_consonant_syllable,
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myanmar_broken_cluster,
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myanmar_non_myanmar_cluster,
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};
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%%{
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machine myanmar_syllable_machine;
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alphtype unsigned char;
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write exports;
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write data;
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}%%
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%%{
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# Spec category D is folded into GB; D0 is not implemented by Uniscribe and as such folded into D
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# Spec category P is folded into GB
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export C = 1;
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export IV = 2;
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export DB = 3; # Dot below = OT_N
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export H = 4;
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export ZWNJ = 5;
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export ZWJ = 6;
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export SM = 8; # Visarga and Shan tones
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export GB = 10; # = OT_PLACEHOLDER
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export DOTTEDCIRCLE = 11;
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export A = 9;
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export Ra = 15;
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export CS = 18;
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export VAbv = 20;
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export VBlw = 21;
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export VPre = 22;
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export VPst = 23;
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# 32+ are for Myanmar-specific values
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export As = 32; # Asat
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export MH = 35; # Medial Ha
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export MR = 36; # Medial Ra
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export MW = 37; # Medial Wa, Shan Wa
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export MY = 38; # Medial Ya, Mon Na, Mon Ma
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export PT = 39; # Pwo and other tones
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export VS = 40; # Variation selectors
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export ML = 41; # Medial Mon La
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j = ZWJ|ZWNJ; # Joiners
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k = (Ra As H); # Kinzi
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c = C|Ra; # is_consonant
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medial_group = MY? As? MR? ((MW MH? ML? | MH ML? | ML) As?)?;
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main_vowel_group = (VPre.VS?)* VAbv* VBlw* A* (DB As?)?;
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post_vowel_group = VPst MH? ML? As* VAbv* A* (DB As?)?;
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pwo_tone_group = PT A* DB? As?;
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complex_syllable_tail = As* medial_group main_vowel_group post_vowel_group* pwo_tone_group* SM* j?;
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syllable_tail = (H (c|IV).VS?)* (H | complex_syllable_tail);
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consonant_syllable = (k|CS)? (c|IV|GB|DOTTEDCIRCLE).VS? syllable_tail;
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broken_cluster = k? VS? syllable_tail;
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other = any;
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main := |*
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consonant_syllable => { found_syllable (myanmar_consonant_syllable); };
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j => { found_syllable (myanmar_non_myanmar_cluster); };
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broken_cluster => { found_syllable (myanmar_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
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other => { found_syllable (myanmar_non_myanmar_cluster); };
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*|;
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}%%
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#define found_syllable(syllable_type) \
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HB_STMT_START { \
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if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \
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for (unsigned int i = ts; i < te; i++) \
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info[i].syllable() = (syllable_serial << 4) | syllable_type; \
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syllable_serial++; \
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if (syllable_serial == 16) syllable_serial = 1; \
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} HB_STMT_END
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inline void
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find_syllables_myanmar (hb_buffer_t *buffer)
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{
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unsigned int p, pe, eof, ts, te, act HB_UNUSED;
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int cs;
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hb_glyph_info_t *info = buffer->info;
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%%{
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write init;
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getkey info[p].myanmar_category();
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}%%
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p = 0;
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pe = eof = buffer->len;
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unsigned int syllable_serial = 1;
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%%{
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write exec;
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}%%
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}
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#undef found_syllable
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#endif /* HB_OT_SHAPER_MYANMAR_MACHINE_HH */
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