kc3-lang/harfbuzz/src/hb-ot-shape-complex-indic-machine.rl

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• Hash : e8b5d640
  Author :
  Date : 2014-05-29T15:18:27
  

  [indic] Do NOT allow reph formation on placeholders
  
  Only allow it on DOTTED CIRCLE.  No effect on test numbers.
  
  Test: U+0930,094D,00A0
  

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• src/hb-ot-shape-complex-indic-machine.rl

• /*
   * 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_SHAPE_COMPLEX_INDIC_MACHINE_HH
  #define HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH
  
  #include "hb-private.hh"
  
  %%{
    machine indic_syllable_machine;
    alphtype unsigned char;
    write data;
  }%%
  
  %%{
  
  # Same order as enum indic_category_t.  Not sure how to avoid duplication.
  X    = 0;
  C    = 1;
  V    = 2;
  N    = 3;
  H    = 4;
  ZWNJ = 5;
  ZWJ  = 6;
  M    = 7;
  SM   = 8;
  VD   = 9;
  A    = 10;
  PLACEHOLDER = 11;
  DOTTEDCIRCLE = 12;
  RS    = 13;
  Coeng = 14;
  Repha = 15;
  Ra    = 16;
  CM    = 17;
  Symbol= 18;
  CM2   = 31;
  
  c = (C | Ra);			# is_consonant
  n = ((ZWNJ?.RS)? (N.N?)?);	# is_consonant_modifier
  z = ZWJ|ZWNJ;			# is_joiner
  h = H | Coeng;			# is_halant_or_coeng
  reph = (Ra H | Repha);		# possible reph
  
  cn = c.ZWJ?.n?;
  forced_rakar = ZWJ H ZWJ Ra;
  symbol = Symbol.N?;
  matra_group = z{0,3}.M.N?.(H | forced_rakar)?;
  syllable_tail = (SM.SM?.ZWNJ?)? A{0,3}? VD{0,2};
  place_holder = PLACEHOLDER | DOTTEDCIRCLE;
  halant_group = (z?.h.(ZWJ.N?)?);
  final_halant_group = halant_group | h.ZWNJ;
  medial_group = CM?.CM2?;
  halant_or_matra_group = (final_halant_group | (h.ZWJ)? matra_group{0,4}) (Coeng (cn|V))?;
  
  
  consonant_syllable =	Repha? (cn.halant_group){0,4} cn medial_group halant_or_matra_group syllable_tail;
  vowel_syllable =	reph? V.n? (ZWJ | (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail);
  standalone_cluster =	(Repha? PLACEHOLDER | reph? DOTTEDCIRCLE).n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
  symbol_cluster = 	symbol syllable_tail;
  broken_cluster =	reph? n? (halant_group.cn){0,4} medial_group halant_or_matra_group syllable_tail;
  other =			any;
  
  main := |*
  	consonant_syllable	=> { found_syllable (consonant_syllable); };
  	vowel_syllable		=> { found_syllable (vowel_syllable); };
  	standalone_cluster	=> { found_syllable (standalone_cluster); };
  	symbol_cluster		=> { found_syllable (symbol_cluster); };
  	broken_cluster		=> { found_syllable (broken_cluster); };
  	other			=> { found_syllable (non_indic_cluster); };
  *|;
  
  
  }%%
  
  #define found_syllable(syllable_type) \
    HB_STMT_START { \
      if (0) fprintf (stderr, "syllable %d..%d %s\n", last, p+1, #syllable_type); \
      for (unsigned int i = last; i < p+1; i++) \
        info[i].syllable() = (syllable_serial << 4) | syllable_type; \
      last = p+1; \
      syllable_serial++; \
      if (unlikely (syllable_serial == 16)) syllable_serial = 1; \
    } HB_STMT_END
  
  static void
  find_syllables (hb_buffer_t *buffer)
  {
    unsigned int p, pe, eof, ts HB_UNUSED, te HB_UNUSED, act HB_UNUSED;
    int cs;
    hb_glyph_info_t *info = buffer->info;
    %%{
      write init;
      getkey info[p].indic_category();
    }%%
  
    p = 0;
    pe = eof = buffer->len;
  
    unsigned int last = 0;
    unsigned int syllable_serial = 1;
    %%{
      write exec;
    }%%
  }
  
  #endif /* HB_OT_SHAPE_COMPLEX_INDIC_MACHINE_HH */
  

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