166b5cf7ec
With FreeSerif, it seems that the 'ccmp' feature does ligature substituttions. That was then causing syllable match failures. We now find syllables before any features have been applied. Test sequence: U+0D9A,U+0DCA,U+200D,U+0DBB,U+0DCF
124 lines
3.5 KiB
Ragel
124 lines
3.5 KiB
Ragel
/*
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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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NBSP = 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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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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matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
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syllable_tail = (Coeng (cn|V))? (SM.ZWNJ?)? (VD VD?)?;
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place_holder = NBSP | 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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halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4});
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consonant_syllable = Repha? (cn.halant_group){0,4} cn A? halant_or_matra_group? syllable_tail;
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vowel_syllable = reph? V.n? (ZWJ | (halant_group.cn){0,4} halant_or_matra_group? syllable_tail);
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standalone_cluster = reph? place_holder.n? (halant_group.cn){0,4} halant_or_matra_group? syllable_tail;
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broken_cluster = n? (halant_group.cn){0,4} 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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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, te, act;
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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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