The Tor Browser: gfx/harfbuzz/src/hb-buffer-deserialize-text.rl@925c144e1f1f

     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  */

    27 #ifndef HB_BUFFER_DESERIALIZE_TEXT_HH

    28 #define HB_BUFFER_DESERIALIZE_TEXT_HH

    30 #include "hb-private.hh"

    32 %%{

    34 machine deserialize_text;

    35 alphtype unsigned char;

    36 write data;

    38 action clear_item {

    39 	memset (&info, 0, sizeof (info));

    40 	memset (&pos , 0, sizeof (pos ));

    41 }

    43 action add_item {

    44 	buffer->add_info (info);

    45 	if (buffer->in_error)

    46 	  return false;

    47 	buffer->pos[buffer->len - 1] = pos;

    48 	*end_ptr = p;

    49 }

    51 action tok {

    52 	tok = p;

    53 }

    55 action parse_glyph {

    56 	if (!hb_font_glyph_from_string (font,

    57 					tok, p - tok,

    58 					&info.codepoint))

    59 	  return false;

    60 }

    62 action parse_cluster   { if (!parse_uint (tok, p, &info.cluster )) return false; }

    63 action parse_x_offset  { if (!parse_int  (tok, p, &pos.x_offset )) return false; }

    64 action parse_y_offset  { if (!parse_int  (tok, p, &pos.y_offset )) return false; }

    65 action parse_x_advance { if (!parse_int  (tok, p, &pos.x_advance)) return false; }

    66 action parse_y_advance { if (!parse_int  (tok, p, &pos.y_advance)) return false; }

    68 unum	= '0' | [1-9] digit*;

    69 num	= '-'? unum;

    71 glyph_id = unum;

    72 glyph_name = alpha (alnum|'_'|'.'|'-')*;

    74 glyph	= (glyph_id | glyph_name) >tok %parse_glyph;

    75 cluster	= '=' (unum >tok %parse_cluster);

    76 offsets	= '@' (num >tok %parse_x_offset)   ',' (num >tok %parse_y_offset );

    77 advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?;

    78 item	=

    79 	(

    80 		glyph

    81 		cluster?

    82 		offsets?

    83 		advances?

    84 	)

    85 	>clear_item

    86 	%add_item

    87 	;

    89 main := space* item (space* '|' space* item)* space* ('|'|']')?;

    91 }%%

    93 static hb_bool_t

    94 _hb_buffer_deserialize_glyphs_text (hb_buffer_t *buffer,

    95 				    const char *buf,

    96 				    unsigned int buf_len,

    97 				    const char **end_ptr,

    98 				    hb_font_t *font)

    99 {

   100   const char *p = buf, *pe = buf + buf_len;

   102   /* Ensure we have positions. */

   103   (void) hb_buffer_get_glyph_positions (buffer, NULL);

   105   while (p < pe && ISSPACE (*p))

   106     p++;

   107   if (p < pe && *p == (buffer->len ? '|' : '['))

   108   {

   109     *end_ptr = ++p;

   110   }

   112   const char *eof = pe, *tok = NULL;

   113   int cs;

   114   hb_glyph_info_t info;

   115   hb_glyph_position_t pos;

   116   %%{

   117     write init;

   118     write exec;

   119   }%%

   121   *end_ptr = p;

   123   return p == pe && *(p-1) != ']';

   124 }

   126 #endif /* HB_BUFFER_DESERIALIZE_TEXT_HH */

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