HarfBuzz text shaping engine
http://harfbuzz.github.io/
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175 lines
4.8 KiB
175 lines
4.8 KiB
/* |
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* Copyright © 2015 Mozilla Foundation. |
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* Copyright © 2015 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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* Mozilla Author(s): Jonathan Kew |
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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH |
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#define HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH |
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#include "hb-private.hh" |
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%%{ |
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machine use_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 use_category_t. Not sure how to avoid duplication. |
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O = 0; # OTHER |
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B = 1; # BASE |
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IND = 3; # BASE_IND |
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N = 4; # BASE_NUM |
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GB = 5; # BASE_OTHER |
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CGJ = 6; # CGJ |
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#F = 7; # CONS_FINAL |
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FM = 8; # CONS_FINAL_MOD |
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#M = 9; # CONS_MED |
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#CM = 10; # CONS_MOD |
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SUB = 11; # CONS_SUB |
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H = 12; # HALANT |
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HN = 13; # HALANT_NUM |
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ZWNJ = 14; # Zero width non-joiner |
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ZWJ = 15; # Zero width joiner |
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WJ = 16; # Word joiner |
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Rsv = 17; # Reserved characters |
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R = 18; # REPHA |
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S = 19; # SYM |
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#SM = 20; # SYM_MOD |
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VS = 21; # VARIATION_SELECTOR |
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#V = 36; # VOWEL |
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#VM = 40; # VOWEL_MOD |
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FAbv = 24; # CONS_FINAL_ABOVE |
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FBlw = 25; # CONS_FINAL_BELOW |
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FPst = 26; # CONS_FINAL_POST |
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MAbv = 27; # CONS_MED_ABOVE |
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MBlw = 28; # CONS_MED_BELOW |
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MPst = 29; # CONS_MED_POST |
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MPre = 30; # CONS_MED_PRE |
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CMAbv = 31; # CONS_MOD_ABOVE |
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CMBlw = 32; # CONS_MOD_BELOW |
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VAbv = 33; # VOWEL_ABOVE / VOWEL_ABOVE_BELOW / VOWEL_ABOVE_BELOW_POST / VOWEL_ABOVE_POST |
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VBlw = 34; # VOWEL_BELOW / VOWEL_BELOW_POST |
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VPst = 35; # VOWEL_POST UIPC = Right |
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VPre = 22; # VOWEL_PRE / VOWEL_PRE_ABOVE / VOWEL_PRE_ABOVE_POST / VOWEL_PRE_POST |
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VMAbv = 37; # VOWEL_MOD_ABOVE |
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VMBlw = 38; # VOWEL_MOD_BELOW |
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VMPst = 39; # VOWEL_MOD_POST |
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VMPre = 23; # VOWEL_MOD_PRE |
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SMAbv = 41; # SYM_MOD_ABOVE |
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SMBlw = 42; # SYM_MOD_BELOW |
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CS = 43; # CONS_WITH_STACKER |
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consonant_modifiers = CMAbv* CMBlw* ((H B | SUB) VS? CMAbv? CMBlw*)*; |
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# Override: Allow two MBlw. https://github.com/harfbuzz/harfbuzz/issues/376 |
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medial_consonants = MPre? MAbv? MBlw?.MBlw? MPst?; |
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dependent_vowels = VPre* VAbv* VBlw* VPst*; |
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vowel_modifiers = VMPre* VMAbv* VMBlw* VMPst*; |
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final_consonants = FAbv* FBlw* FPst* FM?; |
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virama_terminated_cluster = |
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(R|CS)? (B | GB) VS? |
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consonant_modifiers |
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H |
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; |
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standard_cluster = |
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(R|CS)? (B | GB) VS? |
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consonant_modifiers |
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medial_consonants |
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dependent_vowels |
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vowel_modifiers |
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final_consonants |
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; |
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broken_cluster = |
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R? |
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consonant_modifiers |
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medial_consonants |
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dependent_vowels |
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vowel_modifiers |
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final_consonants |
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; |
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number_joiner_terminated_cluster = N VS? (HN N VS?)* HN; |
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numeral_cluster = N VS? (HN N VS?)*; |
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symbol_cluster = S VS? SMAbv* SMBlw*; |
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independent_cluster = (IND | O | Rsv | WJ) VS?; |
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other = any; |
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main := |* |
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independent_cluster => { found_syllable (independent_cluster); }; |
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virama_terminated_cluster => { found_syllable (virama_terminated_cluster); }; |
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standard_cluster => { found_syllable (standard_cluster); }; |
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number_joiner_terminated_cluster => { found_syllable (number_joiner_terminated_cluster); }; |
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numeral_cluster => { found_syllable (numeral_cluster); }; |
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symbol_cluster => { found_syllable (symbol_cluster); }; |
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broken_cluster => { found_syllable (broken_cluster); }; |
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other => { found_syllable (non_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", last, p+1, #syllable_type); \ |
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for (unsigned int i = last; i < p+1; i++) \ |
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info[i].syllable() = (syllable_serial << 4) | syllable_type; \ |
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last = p+1; \ |
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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 HB_UNUSED, te HB_UNUSED, 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].use_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 last = 0; |
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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_USE_MACHINE_HH */
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