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      1 /*
      2  * Copyright  2011,2012  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_MYANMAR_MACHINE_HH
     28 #define HB_OT_SHAPE_COMPLEX_MYANMAR_MACHINE_HH
     29 
     30 #include "hb-private.hh"
     31 
     32 %%{
     33   machine myanmar_syllable_machine;
     34   alphtype unsigned char;
     35   write data;
     36 }%%
     37 
     38 %%{
     39 
     40 # Same order as enum myanmar_category_t.  Not sure how to avoid duplication.
     41 A    = 10;
     42 As   = 18;
     43 C    = 1;
     44 D    = 19;
     45 D0   = 20;
     46 DB   = 3;
     47 GB   = 12;
     48 H    = 4;
     49 IV   = 2;
     50 MH   = 21;
     51 MR   = 22;
     52 MW   = 23;
     53 MY   = 24;
     54 PT   = 25;
     55 V    = 8;
     56 VAbv = 26;
     57 VBlw = 27;
     58 VPre = 28;
     59 VPst = 29;
     60 VS   = 30;
     61 ZWJ  = 6;
     62 ZWNJ = 5;
     63 Ra   = 16;
     64 
     65 j = ZWJ|ZWNJ;			# Joiners
     66 k = (Ra As H);			# Kinzi
     67 
     68 c = C|Ra;			# is_consonant
     69 
     70 medial_group = MY? MR? ((MW MH? | MH) As?)?;
     71 main_vowel_group = VPre* VAbv* VBlw* A* (DB As?)?;
     72 post_vowel_group = VPst MH? As* VAbv* A* (DB As?)?;
     73 pwo_tone_group = PT A* (DB As?)?;
     74 
     75 complex_syllable_tail = As* medial_group main_vowel_group post_vowel_group* pwo_tone_group* V* j?;
     76 syllable_tail = (H | complex_syllable_tail);
     77 
     78 consonant_syllable =	k? (c|IV|D|GB).VS? (H (c|IV).VS?)* syllable_tail;
     79 broken_cluster =	k? VS? syllable_tail;
     80 other =			any;
     81 
     82 main := |*
     83 	consonant_syllable	=> { found_syllable (consonant_syllable); };
     84 	j			=> { found_syllable (non_myanmar_cluster); };
     85 	broken_cluster		=> { found_syllable (broken_cluster); };
     86 	other			=> { found_syllable (non_myanmar_cluster); };
     87 *|;
     88 
     89 
     90 }%%
     91 
     92 #define found_syllable(syllable_type) \
     93   HB_STMT_START { \
     94     if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
     95     for (unsigned int i = last; i < p+1; i++) \
     96       info[i].syllable() = (syllable_serial << 4) | syllable_type; \
     97     last = p+1; \
     98     syllable_serial++; \
     99     if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
    100   } HB_STMT_END
    101 
    102 static void
    103 find_syllables (hb_buffer_t *buffer)
    104 {
    105   unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
    106   int cs;
    107   hb_glyph_info_t *info = buffer->info;
    108   %%{
    109     write init;
    110     getkey info[p].myanmar_category();
    111   }%%
    112 
    113   p = 0;
    114   pe = eof = buffer->len;
    115 
    116   unsigned int last = 0;
    117   unsigned int syllable_serial = 1;
    118   %%{
    119     write exec;
    120   }%%
    121 }
    122 
    123 #undef found_syllable
    124 
    125 #endif /* HB_OT_SHAPE_COMPLEX_MYANMAR_MACHINE_HH */
    126