hb-ot-shape-complex-indic-machine.rl revision 73d71cc527d28fd5519c5d965c272ea1fb149a0e
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_SHAPE_COMPLEX_INDIC_MACHINE_HH 28#define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH 29 30#include "hb-private.hh" 31 32%%{ 33 machine indic_syllable_machine; 34 alphtype unsigned char; 35 write data; 36}%% 37 38%%{ 39 40# Same order as enum indic_category_t. Not sure how to avoid duplication. 41X = 0; 42C = 1; 43V = 2; 44N = 3; 45H = 4; 46ZWNJ = 5; 47ZWJ = 6; 48M = 7; 49SM = 8; 50VD = 9; 51A = 10; 52NBSP = 11; 53DOTTEDCIRCLE = 12; 54RS = 13; 55Coeng = 14; 56Repha = 15; 57Ra = 16; 58 59c = (C | Ra); # is_consonant 60n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier 61z = ZWJ|ZWNJ; # is_joiner 62h = H | Coeng; # is_halant_or_coeng 63reph = (Ra H | Repha); # possible reph 64 65cn = c.n?; 66forced_rakar = ZWJ H ZWJ Ra; 67matra_group = z*.M.N?.(H | forced_rakar)?; 68syllable_tail = (SM.ZWNJ?)? (Coeng (cn|V))? (VD VD?)?; 69place_holder = NBSP | DOTTEDCIRCLE; 70halant_group = (z?.h.ZWJ?); 71final_halant_group = halant_group | h.ZWNJ; 72halant_or_matra_group = (final_halant_group | matra_group*); 73 74 75consonant_syllable = Repha? (cn.halant_group){0,4} cn A? halant_or_matra_group? syllable_tail; 76vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} halant_or_matra_group? syllable_tail); 77standalone_cluster = reph? place_holder.n? (halant_group.cn){0,4} halant_or_matra_group? syllable_tail; 78other = any; 79 80main := |* 81 consonant_syllable => { process_syllable (consonant_syllable); }; 82 vowel_syllable => { process_syllable (vowel_syllable); }; 83 standalone_cluster => { process_syllable (standalone_cluster); }; 84 other => { process_syllable (non_indic); }; 85*|; 86 87 88}%% 89 90#define process_syllable(func) \ 91 HB_STMT_START { \ 92 if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #func); \ 93 for (unsigned int i = last; i < p+1; i++) \ 94 info[i].syllable() = syllable_serial; \ 95 PASTE (initial_reordering_, func) (map, buffer, mask_array, last, p+1); \ 96 last = p+1; \ 97 syllable_serial++; \ 98 if (unlikely (!syllable_serial)) syllable_serial++; \ 99 } HB_STMT_END 100 101static void 102find_syllables (const hb_ot_map_t *map, hb_buffer_t *buffer, hb_mask_t *mask_array) 103{ 104 unsigned int p, pe, eof, ts, te, act; 105 int cs; 106 hb_glyph_info_t *info = buffer->info; 107 %%{ 108 write init; 109 getkey info[p].indic_category(); 110 }%% 111 112 p = 0; 113 pe = eof = buffer->len; 114 115 unsigned int last = 0; 116 uint8_t syllable_serial = 1; 117 %%{ 118 write exec; 119 }%% 120} 121 122#endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */ 123