HarfBuzz text shaping engine
http://harfbuzz.github.io/
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111 lines
2.9 KiB
111 lines
2.9 KiB
/* |
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* Copyright © 2011,2012 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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* Google Author(s): Behdad Esfahbod |
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*/ |
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#ifndef HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH |
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#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH |
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#include "hb.hh" |
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%%{ |
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machine khmer_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 khmer_category_t. Not sure how to avoid duplication. |
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C = 1; |
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V = 2; |
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ZWNJ = 5; |
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ZWJ = 6; |
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PLACEHOLDER = 11; |
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DOTTEDCIRCLE = 12; |
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Coeng= 14; |
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Ra = 16; |
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Robatic = 20; |
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Xgroup = 21; |
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Ygroup = 22; |
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VAbv = 26; |
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VBlw = 27; |
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VPre = 28; |
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VPst = 29; |
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c = (C | Ra | V); |
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cn = c.((ZWJ|ZWNJ)?.Robatic)?; |
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joiner = (ZWJ | ZWNJ); |
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xgroup = (joiner*.Xgroup)*; |
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ygroup = Ygroup*; |
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# This grammar was experimentally extracted from what Uniscribe allows. |
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matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?; |
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syllable_tail = xgroup matra_group xgroup (Coeng.c)? ygroup; |
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broken_cluster = (Coeng.cn)* syllable_tail; |
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consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster; |
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other = any; |
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main := |* |
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consonant_syllable => { found_syllable (consonant_syllable); }; |
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broken_cluster => { found_syllable (broken_cluster); }; |
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other => { found_syllable (non_khmer_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", ts, te, #syllable_type); \ |
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for (unsigned int i = ts; i < te; i++) \ |
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info[i].syllable() = (syllable_serial << 4) | syllable_type; \ |
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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, te, 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].khmer_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 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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#endif /* HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH */
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