HarfBuzz text shaping engine
http://harfbuzz.github.io/
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127 lines
3.2 KiB
127 lines
3.2 KiB
/* |
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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_SHAPE_COMPLEX_MYANMAR_MACHINE_HH |
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#define HB_OT_SHAPE_COMPLEX_MYANMAR_MACHINE_HH |
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#include "hb.hh" |
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%%{ |
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machine myanmar_syllable_machine; |
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alphtype unsigned char; |
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write data; |
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}%% |
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%%{ |
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# Same order as enum myanmar_category_t. Not sure how to avoid duplication. |
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A = 10; |
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As = 18; |
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C = 1; |
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D = 32; |
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D0 = 20; |
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DB = 3; |
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GB = 11; |
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H = 4; |
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IV = 2; |
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MH = 21; |
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MR = 22; |
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MW = 23; |
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MY = 24; |
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PT = 25; |
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V = 8; |
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VAbv = 26; |
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VBlw = 27; |
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VPre = 28; |
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VPst = 29; |
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VS = 30; |
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ZWJ = 6; |
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ZWNJ = 5; |
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Ra = 16; |
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P = 31; |
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CS = 19; |
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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? MR? MW? MH? As?; |
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main_vowel_group = (VPre.VS?)* VAbv* VBlw* A* (DB As?)?; |
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post_vowel_group = VPst MH? 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* V* 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|D|GB).VS? syllable_tail; |
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punctuation_cluster = P V; |
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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 (consonant_syllable); }; |
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j => { found_syllable (non_myanmar_cluster); }; |
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punctuation_cluster => { found_syllable (punctuation_cluster); }; |
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broken_cluster => { found_syllable (broken_cluster); }; |
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other => { found_syllable (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 (unlikely (syllable_serial == 16)) syllable_serial = 1; \ |
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} HB_STMT_END |
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static void |
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find_syllables (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_SHAPE_COMPLEX_MYANMAR_MACHINE_HH */
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