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_JSON_HH
28#define HB_BUFFER_DESERIALIZE_JSON_HH
29
30#include "hb-private.hh"
31
32%%{
33
34machine deserialize_json;
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 (buffer->in_error)
46	  return false;
47	buffer->pos[buffer->len - 1] = pos;
48	*end_ptr = p;
49}
50
51action tok {
52	tok = p;
53}
54
55action parse_glyph {
56	if (!hb_font_glyph_from_string (font,
57					tok, p - tok,
58					&info.codepoint))
59	  return false;
60}
61
62action parse_gid       { if (!parse_uint (tok, p, &info.codepoint)) return false; }
63action parse_cluster   { if (!parse_uint (tok, p, &info.cluster )) return false; }
64action parse_x_offset  { if (!parse_int  (tok, p, &pos.x_offset )) return false; }
65action parse_y_offset  { if (!parse_int  (tok, p, &pos.y_offset )) return false; }
66action parse_x_advance { if (!parse_int  (tok, p, &pos.x_advance)) return false; }
67action parse_y_advance { if (!parse_int  (tok, p, &pos.y_advance)) return false; }
68
69unum	= '0' | [1-9] digit*;
70num	= '-'? unum;
71
72comma = space* ',' space*;
73colon = space* ':' space*;
74
75glyph_id = unum;
76glyph_name = alpha (alnum|'_'|'.'|'-')*;
77
78glyph_string   = '"' (glyph_name >tok %parse_glyph) '"';
79glyph_number = (glyph_id >tok %parse_gid);
80
81glyph	= "\"g\""  colon (glyph_string | glyph_number);
82cluster	= "\"cl\"" colon (unum >tok %parse_cluster);
83xoffset	= "\"dx\"" colon (num >tok %parse_x_offset);
84yoffset	= "\"dy\"" colon (num >tok %parse_y_offset);
85xadvance= "\"ax\"" colon (num >tok %parse_x_advance);
86yadvance= "\"ay\"" colon (num >tok %parse_y_advance);
87
88element = glyph | cluster | xoffset | yoffset | xadvance | yadvance;
89item	=
90	( '{' space* element (comma element)* space* '}')
91	>clear_item
92	@add_item
93	;
94
95main := space* item (comma item)* space* (','|']')?;
96
97}%%
98
99static hb_bool_t
100_hb_buffer_deserialize_glyphs_json (hb_buffer_t *buffer,
101				    const char *buf,
102				    unsigned int buf_len,
103				    const char **end_ptr,
104				    hb_font_t *font)
105{
106  const char *p = buf, *pe = buf + buf_len;
107
108  /* Ensure we have positions. */
109  (void) hb_buffer_get_glyph_positions (buffer, NULL);
110
111  while (p < pe && ISSPACE (*p))
112    p++;
113  if (p < pe && *p == (buffer->len ? ',' : '['))
114  {
115    *end_ptr = ++p;
116  }
117
118  const char *tok = NULL;
119  int cs;
120  hb_glyph_info_t info;
121  hb_glyph_position_t pos;
122  %%{
123    write init;
124    write exec;
125  }%%
126
127  *end_ptr = p;
128
129  return p == pe && *(p-1) != ']';
130}
131
132#endif /* HB_BUFFER_DESERIALIZE_JSON_HH */
133