kc3-lang/harfbuzz/src/hb-buffer-deserialize-text-unicodes.rl

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• Hash : bc596b8c
  Author :
  Date : 2023-01-23T21:03:59
  

  [buffer-deserialize-text-unicode] Simplify
  

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• src/hb-buffer-deserialize-text-unicodes.rl

• /*
   * Copyright © 2013  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_BUFFER_DESERIALIZE_TEXT_UNICODES_HH
  #define HB_BUFFER_DESERIALIZE_TEXT_UNICODES_HH
  
  #include "hb.hh"
  
  %%{
  
  machine deserialize_text_unicodes;
  alphtype unsigned char;
  write data;
  
  action clear_item {
  	hb_memset (&info, 0, sizeof (info));
  }
  
  action add_item {
  	buffer->add_info (info);
  	if (unlikely (!buffer->successful))
  	  return false;
  	if (buffer->have_positions)
  	  buffer->pos[buffer->len - 1] = pos;
  	*end_ptr = p;
  }
  
  action tok {
  	tok = p;
  }
  
  action parse_hexdigits  {if (!parse_hex (tok, p, &info.codepoint )) return false; }
  
  action parse_cluster	{ if (!parse_uint (tok, p, &info.cluster )) return false; }
  
  unum  = '0' | [1-9] digit*;
  num	= '-'? unum;
  
  cluster	= '=' (unum >tok %parse_cluster);
  
  unicode = 'U' '+' xdigit+ >tok %parse_hexdigits;
  
  unicode_item	=
  	(
  		unicode
  		cluster?
  	)
  	>clear_item
  	%add_item
  	;
  
  unicodes = unicode_item (space* '|' space* unicode_item)* space* ('|'|'>');
  
  main := space* unicodes;
  
  }%%
  
  static hb_bool_t
  _hb_buffer_deserialize_text_unicodes (hb_buffer_t *buffer,
  				      const char *buf,
  				      unsigned int buf_len,
  				      const char **end_ptr,
  				      hb_font_t *font)
  {
    const char *p = buf, *pe = buf + buf_len;
  
    while (p < pe && ISSPACE (*p))
      p++;
    if (p < pe && *p == (buffer->len ? ',' : '<'))
      *end_ptr = ++p;
  
    const char *tok = nullptr;
    int cs;
    hb_glyph_info_t info = {0};
    const hb_glyph_position_t pos = {0};
    %%{
      write init;
      write exec;
    }%%
  
    *end_ptr = p;
  
    return p == pe && *(p-1) != ']';
  }
  
  #endif /* HB_BUFFER_DESERIALIZE_TEXT_UNICODES_HH */
  

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