1/* 2 * Copyright © 2015 Mozilla Foundation. 3 * Copyright © 2015 Google, Inc. 4 * 5 * This is part of HarfBuzz, a text shaping library. 6 * 7 * Permission is hereby granted, without written agreement and without 8 * license or royalty fees, to use, copy, modify, and distribute this 9 * software and its documentation for any purpose, provided that the 10 * above copyright notice and the following two paragraphs appear in 11 * all copies of this software. 12 * 13 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 14 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 15 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 16 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 17 * DAMAGE. 18 * 19 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 20 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 21 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 22 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 23 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 24 * 25 * Mozilla Author(s): Jonathan Kew 26 * Google Author(s): Behdad Esfahbod 27 */ 28 29#ifndef HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH 30#define HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH 31 32#include "hb.hh" 33 34%%{ 35 machine use_syllable_machine; 36 alphtype unsigned char; 37 write data; 38}%% 39 40%%{ 41 42# Same order as enum use_category_t. Not sure how to avoid duplication. 43 44O = 0; # OTHER 45 46B = 1; # BASE 47IND = 3; # BASE_IND 48N = 4; # BASE_NUM 49GB = 5; # BASE_OTHER 50CGJ = 6; # CGJ 51#F = 7; # CONS_FINAL 52#FM = 8; # CONS_FINAL_MOD 53#M = 9; # CONS_MED 54#CM = 10; # CONS_MOD 55SUB = 11; # CONS_SUB 56H = 12; # HALANT 57 58HN = 13; # HALANT_NUM 59ZWNJ = 14; # Zero width non-joiner 60ZWJ = 15; # Zero width joiner 61WJ = 16; # Word joiner 62Rsv = 17; # Reserved characters 63R = 18; # REPHA 64S = 19; # SYM 65#SM = 20; # SYM_MOD 66VS = 21; # VARIATION_SELECTOR 67#V = 36; # VOWEL 68#VM = 40; # VOWEL_MOD 69CS = 43; # CONS_WITH_STACKER 70HVM = 44; # HALANT_OR_VOWEL_MODIFIER 71Sk = 48; # SAKOT 72 73FAbv = 24; # CONS_FINAL_ABOVE 74FBlw = 25; # CONS_FINAL_BELOW 75FPst = 26; # CONS_FINAL_POST 76MAbv = 27; # CONS_MED_ABOVE 77MBlw = 28; # CONS_MED_BELOW 78MPst = 29; # CONS_MED_POST 79MPre = 30; # CONS_MED_PRE 80CMAbv = 31; # CONS_MOD_ABOVE 81CMBlw = 32; # CONS_MOD_BELOW 82VAbv = 33; # VOWEL_ABOVE / VOWEL_ABOVE_BELOW / VOWEL_ABOVE_BELOW_POST / VOWEL_ABOVE_POST 83VBlw = 34; # VOWEL_BELOW / VOWEL_BELOW_POST 84VPst = 35; # VOWEL_POST UIPC = Right 85VPre = 22; # VOWEL_PRE / VOWEL_PRE_ABOVE / VOWEL_PRE_ABOVE_POST / VOWEL_PRE_POST 86VMAbv = 37; # VOWEL_MOD_ABOVE 87VMBlw = 38; # VOWEL_MOD_BELOW 88VMPst = 39; # VOWEL_MOD_POST 89VMPre = 23; # VOWEL_MOD_PRE 90SMAbv = 41; # SYM_MOD_ABOVE 91SMBlw = 42; # SYM_MOD_BELOW 92FMAbv = 45; # CONS_FINAL_MOD UIPC = Top 93FMBlw = 46; # CONS_FINAL_MOD UIPC = Bottom 94FMPst = 47; # CONS_FINAL_MOD UIPC = Not_Applicable 95 96h = H | HVM | Sk; 97 98# Override: Adhoc ZWJ placement. https://github.com/harfbuzz/harfbuzz/issues/542#issuecomment-353169729 99consonant_modifiers = CMAbv* CMBlw* ((ZWJ?.h.ZWJ? B | SUB) VS? CMAbv? CMBlw*)*; 100# Override: Allow two MBlw. https://github.com/harfbuzz/harfbuzz/issues/376 101medial_consonants = MPre? MAbv? MBlw?.MBlw? MPst?; 102dependent_vowels = VPre* VAbv* VBlw* VPst*; 103vowel_modifiers = HVM? VMPre* VMAbv* VMBlw* VMPst*; 104final_consonants = FAbv* FBlw* FPst*; 105final_modifiers = FMAbv* FMBlw* | FMPst?; 106 107complex_syllable_start = (R | CS)? (B | GB) VS?; 108complex_syllable_middle = 109 consonant_modifiers 110 medial_consonants 111 dependent_vowels 112 vowel_modifiers 113 (Sk B)* 114; 115complex_syllable_tail = 116 complex_syllable_middle 117 final_consonants 118 final_modifiers 119; 120number_joiner_terminated_cluster_tail = (HN N VS?)* HN; 121numeral_cluster_tail = (HN N VS?)+; 122symbol_cluster_tail = SMAbv+ SMBlw* | SMBlw+; 123 124virama_terminated_cluster = 125 complex_syllable_start 126 consonant_modifiers 127 ZWJ?.h.ZWJ? 128; 129sakot_terminated_cluster = 130 complex_syllable_start 131 complex_syllable_middle 132 Sk 133; 134standard_cluster = 135 complex_syllable_start 136 complex_syllable_tail 137; 138broken_cluster = 139 R? 140 (complex_syllable_tail | number_joiner_terminated_cluster_tail | numeral_cluster_tail | symbol_cluster_tail) 141; 142 143number_joiner_terminated_cluster = N VS? number_joiner_terminated_cluster_tail; 144numeral_cluster = N VS? numeral_cluster_tail?; 145symbol_cluster = (S | GB) VS? symbol_cluster_tail?; 146independent_cluster = (IND | O | Rsv | WJ) VS?; 147other = any; 148 149main := |* 150 independent_cluster => { found_syllable (independent_cluster); }; 151 virama_terminated_cluster => { found_syllable (virama_terminated_cluster); }; 152 sakot_terminated_cluster => { found_syllable (sakot_terminated_cluster); }; 153 standard_cluster => { found_syllable (standard_cluster); }; 154 number_joiner_terminated_cluster => { found_syllable (number_joiner_terminated_cluster); }; 155 numeral_cluster => { found_syllable (numeral_cluster); }; 156 symbol_cluster => { found_syllable (symbol_cluster); }; 157 broken_cluster => { found_syllable (broken_cluster); }; 158 other => { found_syllable (non_cluster); }; 159*|; 160 161 162}%% 163 164#define found_syllable(syllable_type) \ 165 HB_STMT_START { \ 166 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \ 167 for (unsigned int i = ts; i < te; i++) \ 168 info[i].syllable() = (syllable_serial << 4) | use_##syllable_type; \ 169 syllable_serial++; \ 170 if (unlikely (syllable_serial == 16)) syllable_serial = 1; \ 171 } HB_STMT_END 172 173static void 174find_syllables_use (hb_buffer_t *buffer) 175{ 176 unsigned int p, pe, eof, ts, te, act; 177 int cs; 178 hb_glyph_info_t *info = buffer->info; 179 %%{ 180 write init; 181 getkey info[p].use_category(); 182 }%% 183 184 p = 0; 185 pe = eof = buffer->len; 186 187 unsigned int syllable_serial = 1; 188 %%{ 189 write exec; 190 }%% 191} 192 193#undef found_syllable 194 195#endif /* HB_OT_SHAPE_COMPLEX_USE_MACHINE_HH */ 196