HarfBuzz text shaping engine
http://harfbuzz.github.io/
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130 lines
3.8 KiB
130 lines
3.8 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_INDIC_MACHINE_HH |
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#define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH |
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#include "hb-private.hh" |
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%%{ |
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machine indic_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 indic_category_t. Not sure how to avoid duplication. |
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X = 0; |
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C = 1; |
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V = 2; |
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N = 3; |
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H = 4; |
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ZWNJ = 5; |
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ZWJ = 6; |
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M = 7; |
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SM = 8; |
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VD = 9; |
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A = 10; |
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PLACEHOLDER = 11; |
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DOTTEDCIRCLE = 12; |
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RS = 13; |
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Coeng = 14; |
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Repha = 15; |
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Ra = 16; |
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CM = 17; |
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Symbol= 18; |
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CS = 19; |
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c = (C | Ra); # is_consonant |
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n = ((ZWNJ?.RS)? (N.N?)?); # is_consonant_modifier |
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z = ZWJ|ZWNJ; # is_joiner |
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h = H | Coeng; # is_halant_or_coeng |
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reph = (Ra H | Repha); # possible reph |
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cn = c.ZWJ?.n?; |
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forced_rakar = ZWJ H ZWJ Ra; |
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symbol = Symbol.N?; |
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matra_group = z{0,3}.M.N?.(H | forced_rakar)?; |
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syllable_tail = (z?.SM.SM?.ZWNJ?)? A{0,3}? VD{0,2}; |
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place_holder = PLACEHOLDER | DOTTEDCIRCLE; |
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halant_group = (z?.h.(ZWJ.N?)?); |
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final_halant_group = halant_group | h.ZWNJ; |
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medial_group = CM?; |
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halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4}) (Coeng (cn|V))?; |
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consonant_syllable = (Repha|CS)? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail; |
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vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail); |
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standalone_cluster = ((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail; |
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symbol_cluster = symbol syllable_tail; |
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broken_cluster = reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail; |
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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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vowel_syllable => { found_syllable (vowel_syllable); }; |
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standalone_cluster => { found_syllable (standalone_cluster); }; |
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symbol_cluster => { found_syllable (symbol_cluster); }; |
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broken_cluster => { found_syllable (broken_cluster); }; |
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other => { found_syllable (non_indic_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", last, p+1, #syllable_type); \ |
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for (unsigned int i = last; i < p+1; i++) \ |
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info[i].syllable() = (syllable_serial << 4) | syllable_type; \ |
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last = p+1; \ |
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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 HB_UNUSED, te HB_UNUSED, 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].indic_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 last = 0; |
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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_INDIC_MACHINE_HH */
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