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

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

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

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• src/hb-ot-shaper-myanmar-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_MYANMAR_MACHINE_HH
  #define HB_OT_SHAPER_MYANMAR_MACHINE_HH
  
  #include "hb.hh"
  
  #include "hb-ot-layout.hh"
  #include "hb-ot-shaper-indic.hh"
  
  /* buffer var allocations */
  #define myanmar_category() ot_shaper_var_u8_category() /* myanmar_category_t */
  #define myanmar_position() ot_shaper_var_u8_auxiliary() /* myanmar_position_t */
  
  using myanmar_category_t = unsigned;
  using myanmar_position_t = ot_position_t;
  
  #define M_Cat(Cat) myanmar_syllable_machine_ex_##Cat
  
  enum myanmar_syllable_type_t {
    myanmar_consonant_syllable,
    myanmar_broken_cluster,
    myanmar_non_myanmar_cluster,
  };
  
  %%{
    machine myanmar_syllable_machine;
    alphtype unsigned char;
    write exports;
    write data;
  }%%
  
  %%{
  
  
  # Spec category D is folded into GB; D0 is not implemented by Uniscribe and as such folded into D
  # Spec category P is folded into GB
  
  export C    = 1;
  export IV   = 2;
  export DB   = 3;	# Dot below	     = OT_N
  export H    = 4;
  export ZWNJ = 5;
  export ZWJ  = 6;
  export SM    = 8;	# Visarga and Shan tones
  export GB   = 10;	# 		     = OT_PLACEHOLDER
  export DOTTEDCIRCLE = 11;
  export A    = 9;
  export Ra   = 15;
  export CS   = 18;
  export SMPst= 57;
  
  export VAbv = 20;
  export VBlw = 21;
  export VPre = 22;
  export VPst = 23;
  
  # 32+ are for Myanmar-specific values
  export As   = 32;	# Asat
  export MH   = 35;	# Medial Ha
  export MR   = 36;	# Medial Ra
  export MW   = 37;	# Medial Wa, Shan Wa
  export MY   = 38;	# Medial Ya, Mon Na, Mon Ma
  export PT   = 39;	# Pwo and other tones
  export VS   = 40;	# Variation selectors
  export ML   = 41;	# Medial Mon La
  
  
  j = ZWJ|ZWNJ;			# Joiners
  k = (Ra As H);			# Kinzi
  sm = SM | SMPst;
  c = C|Ra;			# is_consonant
  
  medial_group = MY? As? MR? ((MW MH? ML? | MH ML? | ML) As?)?;
  main_vowel_group = (VPre.VS?)* VAbv* VBlw* A* (DB As?)?;
  post_vowel_group = VPst MH? ML? As* VAbv* A* (DB As?)?;
  tone_group = sm | PT A* DB? As?;
  
  complex_syllable_tail = As* medial_group main_vowel_group post_vowel_group* tone_group* j?;
  syllable_tail = (H (c|IV).VS?)* (H | complex_syllable_tail);
  
  consonant_syllable =	(k|CS)? (c|IV|GB|DOTTEDCIRCLE).VS? syllable_tail;
  broken_cluster =	k? VS? syllable_tail;
  other =			any;
  
  main := |*
  	consonant_syllable	=> { found_syllable (myanmar_consonant_syllable); };
  	j | SMPst		=> { found_syllable (myanmar_non_myanmar_cluster); };
  	broken_cluster		=> { found_syllable (myanmar_broken_cluster); buffer->scratch_flags |= HB_BUFFER_SCRATCH_FLAG_HAS_BROKEN_SYLLABLE; };
  	other			=> { found_syllable (myanmar_non_myanmar_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_myanmar (hb_buffer_t *buffer)
  {
    unsigned int p, pe, eof, ts, te, act HB_UNUSED;
    int cs;
    hb_glyph_info_t *info = buffer->info;
    %%{
      write init;
      getkey info[p].myanmar_category();
    }%%
  
    p = 0;
    pe = eof = buffer->len;
  
    unsigned int syllable_serial = 1;
    %%{
      write exec;
    }%%
  }
  
  #undef found_syllable
  
  #endif /* HB_OT_SHAPER_MYANMAR_MACHINE_HH */
  

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