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hb-buffer-deserialize-text-unicode.rl (2504B)

      1 /*
      2 * Copyright © 2013  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_BUFFER_DESERIALIZE_TEXT_UNICODE_HH
     28 #define HB_BUFFER_DESERIALIZE_TEXT_UNICODE_HH
     29 
     30 #include "hb.hh"
     31 
     32 %%{
     33 
     34 machine deserialize_text_unicode;
     35 alphtype unsigned char;
     36 write data;
     37 
     38 action clear_item {
     39 hb_memset (&info, 0, sizeof (info));
     40 }
     41 
     42 action add_item {
     43 buffer->add_info (info);
     44 if (unlikely (!buffer->successful))
     45   return false;
     46 if (buffer->have_positions)
     47   buffer->pos[buffer->len - 1] = pos;
     48 *end_ptr = p;
     49 }
     50 
     51 action tok {
     52 tok = p;
     53 }
     54 
     55 action parse_hexdigits  {if (!parse_hex (tok, p, &info.codepoint )) return false; }
     56 
     57 action parse_cluster	{ if (!parse_uint (tok, p, &info.cluster )) return false; }
     58 
     59 unum  = '0' | [1-9] digit*;
     60 num	= '-'? unum;
     61 
     62 cluster	= '=' (unum >tok %parse_cluster);
     63 
     64 unicode = [Uu] '+'? xdigit+ >tok %parse_hexdigits;
     65 
     66 unicode_item	=
     67 (
     68 	unicode
     69 	cluster?
     70 	('|' | '>')
     71 )
     72 >clear_item
     73 %add_item
     74 ;
     75 
     76 unicodes = '<'? unicode_item*;
     77 
     78 main := unicodes;
     79 
     80 }%%
     81 
     82 static hb_bool_t
     83 _hb_buffer_deserialize_text_unicode (hb_buffer_t *buffer,
     84 			     const char *buf,
     85 			     unsigned int buf_len,
     86 			     const char **end_ptr,
     87 			     hb_font_t *font)
     88 {
     89  const char *p = buf, *pe = buf + buf_len, *eof = pe;
     90 
     91  const char *tok = nullptr;
     92  int cs;
     93  hb_glyph_info_t info = {0};
     94  const hb_glyph_position_t pos = {0};
     95  %%{
     96    write init;
     97    write exec;
     98  }%%
     99 
    100  *end_ptr = p;
    101 
    102  return p == pe;
    103 }
    104 
    105 #endif /* HB_BUFFER_DESERIALIZE_TEXT_UNICODE_HH */