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| -rw-r--r-- | gfx/harfbuzz/src/hb-ot-shaper-indic-machine.rl | 151 |
1 files changed, 151 insertions, 0 deletions
diff --git a/gfx/harfbuzz/src/hb-ot-shaper-indic-machine.rl b/gfx/harfbuzz/src/hb-ot-shaper-indic-machine.rl new file mode 100644 index 0000000000..f568a84626 --- /dev/null +++ b/gfx/harfbuzz/src/hb-ot-shaper-indic-machine.rl @@ -0,0 +1,151 @@ +/* + * 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_INDIC_MACHINE_HH +#define HB_OT_SHAPER_INDIC_MACHINE_HH + +#include "hb.hh" + +#include "hb-ot-layout.hh" +#include "hb-ot-shaper-indic.hh" + +/* buffer var allocations */ +#define indic_category() ot_shaper_var_u8_category() /* indic_category_t */ +#define indic_position() ot_shaper_var_u8_auxiliary() /* indic_position_t */ + +using indic_category_t = unsigned; +using indic_position_t = ot_position_t; + +#define I_Cat(Cat) indic_syllable_machine_ex_##Cat + +enum indic_syllable_type_t { + indic_consonant_syllable, + indic_vowel_syllable, + indic_standalone_cluster, + indic_symbol_cluster, + indic_broken_cluster, + indic_non_indic_cluster, +}; + +%%{ + machine indic_syllable_machine; + alphtype unsigned char; + write exports; + write data; +}%% + +%%{ + + +export X = 0; +export C = 1; +export V = 2; +export N = 3; +export H = 4; +export ZWNJ = 5; +export ZWJ = 6; +export M = 7; +export SM = 8; +export A = 9; +export VD = 9; +export PLACEHOLDER = 10; +export DOTTEDCIRCLE = 11; +export RS = 12; +export MPst = 13; +export Repha = 14; +export Ra = 15; +export CM = 16; +export Symbol= 17; +export CS = 18; + + +c = (C | Ra); # is_consonant +n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier +z = ZWJ|ZWNJ; # is_joiner +reph = (Ra H | Repha); # possible reph + +cn = c.ZWJ?.n?; +symbol = Symbol.N?; +matra_group = z*.(M | SM? MPst).N?.H?; +syllable_tail = (z?.SM.SM?.ZWNJ?)? (A | VD)*; +halant_group = (z?.H.(ZWJ.N?)?); +final_halant_group = halant_group | H.ZWNJ; +medial_group = CM?; +halant_or_matra_group = (final_halant_group | matra_group*); + +complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail; + +consonant_syllable = (Repha|CS)? cn complex_syllable_tail; +vowel_syllable = reph? V.n? (ZWJ | complex_syllable_tail); +standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? complex_syllable_tail; +symbol_cluster = symbol syllable_tail; +broken_cluster = reph? n? complex_syllable_tail; +other = any; + +main := |* + consonant_syllable => { found_syllable (indic_consonant_syllable); }; + vowel_syllable => { found_syllable (indic_vowel_syllable); }; + standalone_cluster => { found_syllable (indic_standalone_cluster); }; + symbol_cluster => { found_syllable (indic_symbol_cluster); }; + broken_cluster => { found_syllable (indic_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; }; + other => { found_syllable (indic_non_indic_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_indic (hb_buffer_t *buffer) +{ + unsigned int p, pe, eof, ts, te, act; + int cs; + hb_glyph_info_t *info = buffer->info; + %%{ + write init; + getkey info[p].indic_category(); + }%% + + p = 0; + pe = eof = buffer->len; + + unsigned int syllable_serial = 1; + %%{ + write exec; + }%% +} + +#undef found_syllable + +#endif /* HB_OT_SHAPER_INDIC_MACHINE_HH */ |