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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-shape-complex-khmer-machine.rl')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-shape-complex-khmer-machine.rl | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-shape-complex-khmer-machine.rl b/gfx/harfbuzz/src/hb-ot-shape-complex-khmer-machine.rl new file mode 100644 index 0000000000..e7f14533dd --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-shape-complex-khmer-machine.rl @@ -0,0 +1,113 @@ +/* + * 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_SHAPE_COMPLEX_KHMER_MACHINE_HH +#define HB_OT_SHAPE_COMPLEX_KHMER_MACHINE_HH + +#include "hb.hh" + +%%{ + machine khmer_syllable_machine; + alphtype unsigned char; + write data; +}%% + +%%{ + +# Same order as enum khmer_category_t. Not sure how to avoid duplication. +C = 1; +V = 2; +ZWNJ = 5; +ZWJ = 6; +PLACEHOLDER = 11; +DOTTEDCIRCLE = 12; +Coeng= 14; +Ra = 16; +Robatic = 20; +Xgroup = 21; +Ygroup = 22; +VAbv = 26; +VBlw = 27; +VPre = 28; +VPst = 29; + +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 (Coeng.c)? ygroup; + + +broken_cluster = (Coeng.cn)* (Coeng | syllable_tail); +consonant_syllable = (cn|PLACEHOLDER|DOTTEDCIRCLE) broken_cluster; +other = any; + +main := |* + consonant_syllable => { found_syllable (consonant_syllable); }; + broken_cluster => { found_syllable (broken_cluster); }; + other => { found_syllable (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) | khmer_##syllable_type; \ + syllable_serial++; \ + if (unlikely (syllable_serial == 16)) syllable_serial = 1; \ + } HB_STMT_END + +static 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_SHAPE_COMPLEX_KHMER_MACHINE_HH */ |