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      1 /*
      2  * Copyright  2011,2012,2013  Google, Inc.
      3  *
      4  *  This is part of HarfBuzz, a text shaping library.
      5  *
      6  * Permission is hereby granted, without written agreement and without
      7  * license or royalty fees, to use, copy, modify, and distribute this
      8  * software and its documentation for any purpose, provided that the
      9  * above copyright notice and the following two paragraphs appear in
     10  * all copies of this software.
     11  *
     12  * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
     13  * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
     14  * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
     15  * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
     16  * DAMAGE.
     17  *
     18  * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
     19  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
     20  * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
     21  * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
     22  * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
     23  *
     24  * Google Author(s): Behdad Esfahbod
     25  */
     26 
     27 #ifndef HB_OT_SHAPE_COMPLEX_SEA_MACHINE_HH
     28 #define HB_OT_SHAPE_COMPLEX_SEA_MACHINE_HH
     29 
     30 #include "hb-private.hh"
     31 
     32 %%{
     33   machine sea_syllable_machine;
     34   alphtype unsigned char;
     35   write data;
     36 }%%
     37 
     38 %%{
     39 
     40 # Same order as enum sea_category_t.  Not sure how to avoid duplication.
     41 C    = 1;
     42 GB   = 12; # Generic Base
     43 H    = 4;  # Halant
     44 IV   = 2;  # Independent Vowel
     45 MR   = 22; # Medial Ra
     46 CM   = 17; # Consonant Medial
     47 VAbv = 26;
     48 VBlw = 27;
     49 VPre = 28;
     50 VPst = 29;
     51 T    = 3;  # Tone Marks
     52 A    = 10; # Anusvara
     53 
     54 syllable_tail = (VPre|VAbv|VBlw|VPst|H.C|CM|MR|T|A)*;
     55 
     56 consonant_syllable =	(C|IV|GB) syllable_tail;
     57 broken_cluster =	syllable_tail;
     58 other =			any;
     59 
     60 main := |*
     61 	consonant_syllable	=> { found_syllable (consonant_syllable); };
     62 	broken_cluster		=> { found_syllable (broken_cluster); };
     63 	other			=> { found_syllable (non_sea_cluster); };
     64 *|;
     65 
     66 
     67 }%%
     68 
     69 #define found_syllable(syllable_type) \
     70   HB_STMT_START { \
     71     if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
     72     for (unsigned int i = last; i < p+1; i++) \
     73       info[i].syllable() = (syllable_serial << 4) | syllable_type; \
     74     last = p+1; \
     75     syllable_serial++; \
     76     if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
     77   } HB_STMT_END
     78 
     79 static void
     80 find_syllables (hb_buffer_t *buffer)
     81 {
     82   unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
     83   int cs;
     84   hb_glyph_info_t *info = buffer->info;
     85   %%{
     86     write init;
     87     getkey info[p].sea_category();
     88   }%%
     89 
     90   p = 0;
     91   pe = eof = buffer->len;
     92 
     93   unsigned int last = 0;
     94   unsigned int syllable_serial = 1;
     95   %%{
     96     write exec;
     97   }%%
     98 }
     99 
    100 #undef found_syllable
    101 
    102 #endif /* HB_OT_SHAPE_COMPLEX_SEA_MACHINE_HH */
    103