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/*
* Copyright © 2013 Google, Inc.
*
* This is part of HarfBuzz, a text shaping library.
*
* Permission is hereby granted, without written agreement and without
* license or royalty fees, to use, copy, modify, and distribute this
* software and its documentation for any purpose, provided that the
* above copyright notice and the following two paragraphs appear in
* all copies of this software.
*
* IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
* DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
* ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
* IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
* THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
* BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
* FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
* ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
* PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
*
* Google Author(s): Behdad Esfahbod
*/
#ifndef HB_BUFFER_DESERIALIZE_JSON_HH
#define HB_BUFFER_DESERIALIZE_JSON_HH
#include "hb.hh"
%%{
machine deserialize_json;
alphtype unsigned char;
write data;
action clear_item {
hb_memset (&info, 0, sizeof (info));
hb_memset (&pos , 0, sizeof (pos ));
}
action add_item {
buffer->add_info (info);
if (unlikely (!buffer->successful))
return false;
buffer->pos[buffer->len - 1] = pos;
*end_ptr = p;
}
action tok {
tok = p;
}
action ensure_glyphs { if (unlikely (!buffer->ensure_glyphs ())) return false; }
action ensure_unicode { if (unlikely (!buffer->ensure_unicode ())) return false; }
action parse_glyph_name {
/* TODO Unescape \" and \\ if found. */
if (!hb_font_glyph_from_string (font,
tok+1, p - tok - 2, /* Skip "" */
&info.codepoint))
return false;
}
action parse_codepoint { if (!parse_uint (tok, p, &info.codepoint)) return false; }
action parse_cluster { if (!parse_uint (tok, p, &info.cluster )) return false; }
action parse_x_offset { if (!parse_int (tok, p, &pos.x_offset )) return false; }
action parse_y_offset { if (!parse_int (tok, p, &pos.y_offset )) return false; }
action parse_x_advance { if (!parse_int (tok, p, &pos.x_advance)) return false; }
action parse_y_advance { if (!parse_int (tok, p, &pos.y_advance)) return false; }
action parse_glyph_flags{ if (!parse_uint (tok, p, &info.mask )) return false; }
unum = '0' | [1-9] digit*;
num = '-'? unum;
comma = space* ',' space*;
colon = space* ':' space*;
codepoint = unum;
glyph_name = '"' ([^\\"] | '\\' [\\"])* '"';
parse_glyph_name = (glyph_name >tok %parse_glyph_name);
parse_codepoint = (codepoint >tok %parse_codepoint);
glyph = "\"g\"" colon (parse_glyph_name | parse_codepoint);
unicode = "\"u\"" colon parse_codepoint;
cluster = "\"cl\"" colon (unum >tok %parse_cluster);
xoffset = "\"dx\"" colon (num >tok %parse_x_offset);
yoffset = "\"dy\"" colon (num >tok %parse_y_offset);
xadvance= "\"ax\"" colon (num >tok %parse_x_advance);
yadvance= "\"ay\"" colon (num >tok %parse_y_advance);
glyphflags="\"fl\"" colon (unum >tok %parse_glyph_flags);
element = glyph @ensure_glyphs
| unicode @ensure_unicode
| cluster
| xoffset
| yoffset
| xadvance
| yadvance
| glyphflags;
item =
( '{' space* element (comma element)* space* '}')
>clear_item
@add_item
;
main := space* item (comma item)* space* (','|']');
}%%
static hb_bool_t
_hb_buffer_deserialize_json (hb_buffer_t *buffer,
const char *buf,
unsigned int buf_len,
const char **end_ptr,
hb_font_t *font)
{
const char *p = buf, *pe = buf + buf_len;
/* Ensure we have positions. */
(void) hb_buffer_get_glyph_positions (buffer, nullptr);
while (p < pe && ISSPACE (*p))
p++;
if (p < pe && *p == (buffer->len ? ',' : '['))
*end_ptr = ++p;
const char *tok = nullptr;
int cs;
hb_glyph_info_t info = {0};
hb_glyph_position_t pos = {0};
%%{
write init;
write exec;
}%%
*end_ptr = p;
return p == pe && *(p-1) != ']';
}
#endif /* HB_BUFFER_DESERIALIZE_JSON_HH */