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_KHMER_MACHINE_HH 28#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH 29 30#include "hb.hh" 31 32enum khmer_syllable_type_t { 33 khmer_consonant_syllable, 34 khmer_broken_cluster, 35 khmer_non_khmer_cluster, 36}; 37 38%%{ 39 machine khmer_syllable_machine; 40 alphtype unsigned char; 41 write exports; 42 write data; 43}%% 44 45%%{ 46 47export C = 1; 48export V = 2; 49export ZWNJ = 5; 50export ZWJ = 6; 51export PLACEHOLDER = 11; 52export DOTTEDCIRCLE = 12; 53export Coeng= 14; 54export Ra = 16; 55export Robatic = 20; 56export Xgroup = 21; 57export Ygroup = 22; 58export VAbv = 26; 59export VBlw = 27; 60export VPre = 28; 61export VPst = 29; 62 63c = (C | Ra | V); 64cn = c.((ZWJ|ZWNJ)?.Robatic)?; 65joiner = (ZWJ | ZWNJ); 66xgroup = (joiner*.Xgroup)*; 67ygroup = Ygroup*; 68 69# This grammar was experimentally extracted from what Uniscribe allows. 70 71matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?; 72syllable_tail = xgroup matra_group xgroup (Coeng.c)? ygroup; 73 74 75broken_cluster = (Coeng.cn)* (Coeng | syllable_tail); 76consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster; 77other = any; 78 79main := |* 80 consonant_syllable => { found_syllable (khmer_consonant_syllable); }; 81 broken_cluster => { found_syllable (khmer_broken_cluster); }; 82 other => { found_syllable (khmer_non_khmer_cluster); }; 83*|; 84 85 86}%% 87 88#define found_syllable(syllable_type) \ 89 HB_STMT_START { \ 90 if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \ 91 for (unsigned int i = ts; i < te; i++) \ 92 info[i].syllable() = (syllable_serial << 4) | syllable_type; \ 93 syllable_serial++; \ 94 if (unlikely (syllable_serial == 16)) syllable_serial = 1; \ 95 } HB_STMT_END 96 97static void 98find_syllables_khmer (hb_buffer_t *buffer) 99{ 100 unsigned int p, pe, eof, ts, te, act HB_UNUSED; 101 int cs; 102 hb_glyph_info_t *info = buffer->info; 103 %%{ 104 write init; 105 getkey info[p].khmer_category(); 106 }%% 107 108 p = 0; 109 pe = eof = buffer->len; 110 111 unsigned int syllable_serial = 1; 112 %%{ 113 write exec; 114 }%% 115} 116 117#undef found_syllable 118 119#endif /* HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH */ 120