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

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• Hash : 57569baa
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  Date : 2025-01-02T21:14:25
  

  Don’t insert U+25CC before super/subscript digits
  

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• src/hb-ot-shaper-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_SHAPER_INDIC_MACHINE_HH
  #define HB_OT_SHAPER_INDIC_MACHINE_HH
  
  #include "hb.hh"
  
  #include "hb-ot-layout.hh"
  #include "hb-ot-shaper-indic.hh"
  
  /* buffer var allocations */
  #define indic_category() ot_shaper_var_u8_category() /* indic_category_t */
  #define indic_position() ot_shaper_var_u8_auxiliary() /* indic_position_t */
  
  using indic_category_t = unsigned;
  using indic_position_t = ot_position_t;
  
  #define I_Cat(Cat) indic_syllable_machine_ex_##Cat
  
  enum indic_syllable_type_t {
    indic_consonant_syllable,
    indic_vowel_syllable,
    indic_standalone_cluster,
    indic_symbol_cluster,
    indic_broken_cluster,
    indic_non_indic_cluster,
  };
  
  %%{
    machine indic_syllable_machine;
    alphtype unsigned char;
    write exports;
    write data;
  }%%
  
  %%{
  
  
  export X    = 0;
  export C    = 1;
  export V    = 2;
  export N    = 3;
  export H    = 4;
  export ZWNJ = 5;
  export ZWJ  = 6;
  export M    = 7;
  export SM   = 8;
  export A    = 9;
  export VD   = 9;
  export PLACEHOLDER = 10;
  export DOTTEDCIRCLE = 11;
  export RS    = 12;
  export MPst  = 13;
  export Repha = 14;
  export Ra    = 15;
  export CM    = 16;
  export Symbol= 17;
  export CS    = 18;
  export SMPst = 57;
  
  
  c = (C | Ra);			# is_consonant
  n = ((ZWNJ?.RS)? (N.N?)?);	# is_consonant_modifier
  z = ZWJ|ZWNJ;			# is_joiner
  reph = (Ra H | Repha);		# possible reph
  sm = SM | SMPst;
  
  cn = c.ZWJ?.n?;
  symbol = Symbol.N?;
  matra_group = z*.(M | sm? MPst).N?.H?;
  syllable_tail = (z?.sm.sm?.ZWNJ?)? (A | VD)*;
  halant_group = (z?.H.(ZWJ.N?)?);
  final_halant_group = halant_group | H.ZWNJ;
  medial_group = CM?;
  halant_or_matra_group = (final_halant_group | matra_group*);
  
  complex_syllable_tail = (halant_group.cn)* medial_group halant_or_matra_group syllable_tail;
  
  consonant_syllable =	(Repha|CS)? cn complex_syllable_tail;
  vowel_syllable =	reph? V.n? (ZWJ | complex_syllable_tail);
  standalone_cluster =	((Repha|CS)? PLACEHOLDER | reph? DOTTEDCIRCLE).n? complex_syllable_tail;
  symbol_cluster =	symbol syllable_tail;
  broken_cluster =	reph? n? complex_syllable_tail;
  other =			any;
  
  main := |*
  	consonant_syllable	=> { found_syllable (indic_consonant_syllable); };
  	vowel_syllable		=> { found_syllable (indic_vowel_syllable); };
  	standalone_cluster	=> { found_syllable (indic_standalone_cluster); };
  	symbol_cluster		=> { found_syllable (indic_symbol_cluster); };
  	SMPst			=> { found_syllable (indic_non_indic_cluster); };
  	broken_cluster		=> { found_syllable (indic_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
  	other			=> { found_syllable (indic_non_indic_cluster); };
  *|;
  
  
  }%%
  
  #define found_syllable(syllable_type) \
    HB_STMT_START { \
      if (0) fprintf (stderr, "syllable %u..%u %s\n", ts, te, #syllable_type); \
      for (unsigned int i = ts; i < te; i++) \
        info[i].syllable() = (syllable_serial << 4) | syllable_type; \
      syllable_serial++; \
      if (syllable_serial == 16) syllable_serial = 1; \
    } HB_STMT_END
  
  inline void
  find_syllables_indic (hb_buffer_t *buffer)
  {
    unsigned int p, pe, eof, ts, te, act;
    int cs;
    hb_glyph_info_t *info = buffer->info;
    %%{
      write init;
      getkey info[p].indic_category();
    }%%
  
    p = 0;
    pe = eof = buffer->len;
  
    unsigned int syllable_serial = 1;
    %%{
      write exec;
    }%%
  }
  
  #undef found_syllable
  
  #endif /* HB_OT_SHAPER_INDIC_MACHINE_HH */
  

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