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Diffstat (limited to 'gfx/harfbuzz/src/hb-ot-shaper-khmer-machine.rl')
| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-shaper-khmer-machine.rl | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-shaper-khmer-machine.rl b/gfx/harfbuzz/src/hb-ot-shaper-khmer-machine.rl new file mode 100644 index 0000000000..c226e7797e --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-shaper-khmer-machine.rl @@ -0,0 +1,135 @@ +/* + * 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 %u..%u %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 (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 */ |