| /* |
| * Copyright © 2011,2012 Google, Inc. |
| * |
| * This is part of HarfBuzz, a text shaping library. |
| * |
| * Permission is hereby granted, without written agreement and without |
| * license or royalty fees, to use, copy, modify, and distribute this |
| * software and its documentation for any purpose, provided that the |
| * above copyright notice and the following two paragraphs appear in |
| * all copies of this software. |
| * |
| * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR |
| * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES |
| * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN |
| * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH |
| * DAMAGE. |
| * |
| * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING, |
| * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND |
| * FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS |
| * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO |
| * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS. |
| * |
| * Google Author(s): Behdad Esfahbod |
| */ |
| |
| #ifndef HB_OT_SHAPER_KHMER_MACHINE_HH |
| #define HB_OT_SHAPER_KHMER_MACHINE_HH |
| |
| #include "hb.hh" |
| |
| #include "hb-ot-layout.hh" |
| #include "hb-ot-shaper-indic.hh" |
| |
| /* buffer var allocations */ |
| #define khmer_category() ot_shaper_var_u8_category() /* khmer_category_t */ |
| |
| using khmer_category_t = unsigned; |
| |
| #define K_Cat(Cat) khmer_syllable_machine_ex_##Cat |
| |
| enum khmer_syllable_type_t { |
| khmer_consonant_syllable, |
| khmer_broken_cluster, |
| khmer_non_khmer_cluster, |
| }; |
| |
| %%{ |
| machine khmer_syllable_machine; |
| alphtype unsigned char; |
| write exports; |
| write data; |
| }%% |
| |
| %%{ |
| |
| |
| # We use category H for spec category Coeng |
| |
| export C = 1; |
| export V = 2; |
| export H = 4; |
| export ZWNJ = 5; |
| export ZWJ = 6; |
| export PLACEHOLDER = 10; |
| export DOTTEDCIRCLE = 11; |
| export Ra = 15; |
| |
| export VAbv = 20; |
| export VBlw = 21; |
| export VPre = 22; |
| export VPst = 23; |
| |
| export Robatic = 25; |
| export Xgroup = 26; |
| export Ygroup = 27; |
| |
| |
| c = (C | Ra | V); |
| cn = c.((ZWJ|ZWNJ)?.Robatic)?; |
| joiner = (ZWJ | ZWNJ); |
| xgroup = (joiner*.Xgroup)*; |
| ygroup = Ygroup*; |
| |
| # This grammar was experimentally extracted from what Uniscribe allows. |
| |
| matra_group = VPre? xgroup VBlw? xgroup (joiner?.VAbv)? xgroup VPst?; |
| syllable_tail = xgroup matra_group xgroup (H.c)? ygroup; |
| |
| |
| broken_cluster = Robatic? (H.cn)* (H | syllable_tail); |
| consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster; |
| other = any; |
| |
| main := |* |
| consonant_syllable => { found_syllable (khmer_consonant_syllable); }; |
| broken_cluster => { found_syllable (khmer_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; }; |
| other => { found_syllable (khmer_non_khmer_cluster); }; |
| *|; |
| |
| |
| }%% |
| |
| #define found_syllable(syllable_type) \ |
| HB_STMT_START { \ |
| if (0) fprintf (stderr, "syllable %d..%d %s\n", ts, te, #syllable_type); \ |
| for (unsigned int i = ts; i < te; i++) \ |
| info[i].syllable() = (syllable_serial << 4) | syllable_type; \ |
| syllable_serial++; \ |
| if (unlikely (syllable_serial == 16)) syllable_serial = 1; \ |
| } HB_STMT_END |
| |
| inline void |
| find_syllables_khmer (hb_buffer_t *buffer) |
| { |
| unsigned int p, pe, eof, ts, te, act HB_UNUSED; |
| int cs; |
| hb_glyph_info_t *info = buffer->info; |
| %%{ |
| write init; |
| getkey info[p].khmer_category(); |
| }%% |
| |
| p = 0; |
| pe = eof = buffer->len; |
| |
| unsigned int syllable_serial = 1; |
| %%{ |
| write exec; |
| }%% |
| } |
| |
| #undef found_syllable |
| |
| #endif /* HB_OT_SHAPER_KHMER_MACHINE_HH */ |