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_HH
28#define HB_BUFFER_DESERIALIZE_TEXT_HH
29
30#include "hb.hh"
31
32%%{
33
34machine deserialize_text;
35alphtype unsigned char;
36write data;
37
38action clear_item {
39	memset (&info, 0, sizeof (info));
40	memset (&pos , 0, sizeof (pos ));
41}
42
43action add_item {
44	buffer->add_info (info);
45	if (unlikely (!buffer->successful))
46	  return false;
47	buffer->pos[buffer->len - 1] = pos;
48	*end_ptr = p;
49}
50
51action tok {
52	tok = p;
53}
54
55action ensure_glyphs { if (unlikely (!buffer->ensure_glyphs ())) return false; }
56action ensure_unicode { if (unlikely (!buffer->ensure_unicode ())) return false; }
57
58action parse_glyph {
59	/* TODO Unescape delimeters. */
60	if (!hb_font_glyph_from_string (font,
61					tok, p - tok,
62					&info.codepoint))
63	  return false;
64}
65
66action parse_hexdigits  {if (!parse_hex (tok, p, &info.codepoint )) return false; }
67
68action parse_cluster   { if (!parse_uint (tok, p, &info.cluster )) return false; }
69action parse_x_offset  { if (!parse_int  (tok, p, &pos.x_offset )) return false; }
70action parse_y_offset  { if (!parse_int  (tok, p, &pos.y_offset )) return false; }
71action parse_x_advance { if (!parse_int  (tok, p, &pos.x_advance)) return false; }
72action parse_y_advance { if (!parse_int  (tok, p, &pos.y_advance)) return false; }
73
74unum  = '0' | [1-9] digit*;
75num	= '-'? unum;
76
77glyph_id = unum;
78glyph_name = ([^\\\]=@+,|] | '\\' [\\\]=@+,|]) *;
79
80glyph	= (glyph_id | glyph_name) >tok %parse_glyph;
81cluster	= '=' (unum >tok %parse_cluster);
82offsets	= '@' (num >tok %parse_x_offset)   ',' (num >tok %parse_y_offset );
83advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?;
84
85glyph_item	=
86	(
87		glyph
88		cluster?
89		offsets?
90		advances?
91	)
92	>clear_item
93	@ensure_glyphs
94	%add_item
95	;
96
97unicode = 'U' '+' xdigit+ >tok %parse_hexdigits;
98
99unicode_item	=
100	(
101		unicode
102		cluster?
103	)
104	>clear_item
105	@ensure_unicode
106	%add_item
107	;
108
109glyphs = glyph_item (space* '|' space* glyph_item)* space* ('|'|']')?;
110unicodes = unicode_item (space* '|' space* unicode_item)* space* ('|'|'>')?;
111
112main := space* ( ('[' glyphs) | ('<' unicodes) );
113
114}%%
115
116static hb_bool_t
117_hb_buffer_deserialize_text (hb_buffer_t *buffer,
118				    const char *buf,
119				    unsigned int buf_len,
120				    const char **end_ptr,
121				    hb_font_t *font)
122{
123  const char *p = buf, *pe = buf + buf_len;
124
125  /* Ensure we have positions. */
126  (void) hb_buffer_get_glyph_positions (buffer, nullptr);
127
128  while (p < pe && ISSPACE (*p))
129    p++;
130
131  const char *eof = pe, *tok = nullptr;
132  int cs;
133  hb_glyph_info_t info = {0};
134  hb_glyph_position_t pos = {0};
135  %%{
136    write init;
137    write exec;
138  }%%
139
140  *end_ptr = p;
141
142  return p == pe && *(p-1) != ']';
143}
144
145#endif /* HB_BUFFER_DESERIALIZE_TEXT_HH */
146