1/* 2 * Copyright © 2011,2012 Google, Inc. 3 * 4 * This is part of HarfBuzz, a text shaping library. 5 * 6 * Permission is hereby granted, without written agreement and without 7 * license or royalty fees, to use, copy, modify, and distribute this 8 * software and its documentation for any purpose, provided that the 9 * above copyright notice and the following two paragraphs appear in 10 * all copies of this software. 11 * 12 * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR 13 * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES 14 * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN 15 * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH 16 * DAMAGE. 17 * 18 * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, 19 * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND 20 * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS 21 * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO 22 * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. 23 * 24 * Google Author(s): Behdad Esfahbod 25 */ 26 27#ifndef HB_OT_SHAPER_INDIC_MACHINE_HH 28#define HB_OT_SHAPER_INDIC_MACHINE_HH 29 30#include "hb.hh" 31 32#include "hb-ot-layout.hh" 33#include "hb-ot-shaper-indic.hh" 34 35/* buffer var allocations */ 36#define indic_category() ot_shaper_var_u8_category() /* indic_category_t */ 37#define indic_position() ot_shaper_var_u8_auxiliary() /* indic_position_t */ 38 39using indic_category_t = unsigned; 40using indic_position_t = ot_position_t; 41 42#define I_Cat(Cat) indic_syllable_machine_ex_##Cat 43 44enum indic_syllable_type_t { 45 indic_consonant_syllable, 46 indic_vowel_syllable, 47 indic_standalone_cluster, 48 indic_symbol_cluster, 49 indic_broken_cluster, 50 indic_non_indic_cluster, 51}; 52 53%%{ 54 machine indic_syllable_machine; 55 alphtype unsigned char; 56 write exports; 57 write data; 58}%% 59 60%%{ 61 62 63export X = 0; 64export C = 1; 65export V = 2; 66export N = 3; 67export H = 4; 68export ZWNJ = 5; 69export ZWJ = 6; 70export M = 7; 71export SM = 8; 72export A = 9; 73export VD = 9; 74export PLACEHOLDER = 10; 75export DOTTEDCIRCLE = 11; 76export RS = 12; 77export MPst = 13; 78export Repha = 14; 79export Ra = 15; 80export CM = 16; 81export Symbol= 17; 82export CS = 18; 83 84 85c = (C | Ra); # is_consonant 86n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier 87z = ZWJ|ZWNJ; # is_joiner 88reph = (Ra H | Repha); # possible reph 89 90cn = c.ZWJ?.n?; 91symbol = Symbol.N?; 92matra_group = z*.(M | SM? MPst).N?.H?; 93syllable_tail = (z?.SM.SM?.ZWNJ?)? (A | VD)*; 94halant_group = (z?.H.(ZWJ.N?)?); 95final_halant_group = halant_group | H.ZWNJ; 96medial_group = CM?; 97halant_or_matra_group = (final_halant_group | matra_group*); 98 99complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail; 100 101consonant_syllable = (Repha|CS)? cn complex_syllable_tail; 102vowel_syllable = reph? V.n? (ZWJ | complex_syllable_tail); 103standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? complex_syllable_tail; 104symbol_cluster = symbol syllable_tail; 105broken_cluster = reph? n? complex_syllable_tail; 106other = any; 107 108main := |* 109 consonant_syllable => { found_syllable (indic_consonant_syllable); }; 110 vowel_syllable => { found_syllable (indic_vowel_syllable); }; 111 standalone_cluster => { found_syllable (indic_standalone_cluster); }; 112 symbol_cluster => { found_syllable (indic_symbol_cluster); }; 113 broken_cluster => { found_syllable (indic_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; }; 114 other => { found_syllable (indic_non_indic_cluster); }; 115*|; 116 117 118}%% 119 120#define found_syllable(syllable_type) \ 121 HB_STMT_START { \ 122 if (0) fprintf (stderr, "syllable %u..%u %s\n", ts, te, #syllable_type); \ 123 for (unsigned int i = ts; i < te; i++) \ 124 info[i].syllable() = (syllable_serial << 4) | syllable_type; \ 125 syllable_serial++; \ 126 if (syllable_serial == 16) syllable_serial = 1; \ 127 } HB_STMT_END 128 129inline void 130find_syllables_indic (hb_buffer_t *buffer) 131{ 132 unsigned int p, pe, eof, ts, te, act; 133 int cs; 134 hb_glyph_info_t *info = buffer->info; 135 %%{ 136 write init; 137 getkey info[p].indic_category(); 138 }%% 139 140 p = 0; 141 pe = eof = buffer->len; 142 143 unsigned int syllable_serial = 1; 144 %%{ 145 write exec; 146 }%% 147} 148 149#undef found_syllable 150 151#endif /* HB_OT_SHAPER_INDIC_MACHINE_HH */ 152