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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	hb_memset (&info, 0, sizeof (info));
40	hb_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 delimiters. */
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; }
73action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask    )) return false; }
74
75unum  = '0' | [1-9] digit*;
76num	= '-'? unum;
77
78glyph_id = unum;
79glyph_name = ([^\\\]=@+,#|] | '\\' [\\\]=@+,|]) *;
80
81glyph	= (glyph_id | glyph_name) >tok %parse_glyph;
82cluster	= '=' (unum >tok %parse_cluster);
83offsets	= '@' (num >tok %parse_x_offset)   ',' (num >tok %parse_y_offset );
84advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?;
85glyphflags= '#' (unum >tok %parse_glyph_flags);
86
87glyph_item	=
88	(
89		glyph
90		cluster?
91		offsets?
92		advances?
93		glyphflags?
94	)
95	>clear_item
96	@ensure_glyphs
97	%add_item
98	;
99
100unicode = 'U' '+' xdigit+ >tok %parse_hexdigits;
101
102unicode_item	=
103	(
104		unicode
105		cluster?
106	)
107	>clear_item
108	@ensure_unicode
109	%add_item
110	;
111
112glyphs = glyph_item (space* '|' space* glyph_item)* space* ('|'|']')?;
113unicodes = unicode_item (space* '|' space* unicode_item)* space* ('|'|'>')?;
114
115main := space* ( ('[' glyphs) | ('<' unicodes) );
116
117}%%
118
119static hb_bool_t
120_hb_buffer_deserialize_text (hb_buffer_t *buffer,
121				    const char *buf,
122				    unsigned int buf_len,
123				    const char **end_ptr,
124				    hb_font_t *font)
125{
126  const char *p = buf, *pe = buf + buf_len;
127
128  /* Ensure we have positions. */
129  (void) hb_buffer_get_glyph_positions (buffer, nullptr);
130
131  while (p < pe && ISSPACE (*p))
132    p++;
133
134  const char *eof = pe, *tok = nullptr;
135  int cs;
136  hb_glyph_info_t info = {0};
137  hb_glyph_position_t pos = {0};
138  %%{
139    write init;
140    write exec;
141  }%%
142
143  *end_ptr = p;
144
145  return p == pe && *(p-1) != ']';
146}
147
148#endif /* HB_BUFFER_DESERIALIZE_TEXT_HH */
149