132 lines
3.4 KiB
Ragel
132 lines
3.4 KiB
Ragel
/*
|
|
* 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_TEXT_HH
|
|
#define HB_BUFFER_DESERIALIZE_TEXT_HH
|
|
|
|
#include "hb.hh"
|
|
|
|
%%{
|
|
|
|
machine deserialize_text;
|
|
alphtype unsigned char;
|
|
write data;
|
|
|
|
action clear_item {
|
|
memset (&info, 0, sizeof (info));
|
|
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 parse_glyph {
|
|
if (!hb_font_glyph_from_string (font,
|
|
tok, p - tok,
|
|
&info.codepoint))
|
|
return false;
|
|
}
|
|
|
|
action parse_hexdigits {if (!parse_hex (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; }
|
|
|
|
unum = '0' | [1-9] digit*;
|
|
num = '-'? unum;
|
|
|
|
glyph_id = unum;
|
|
glyph_name = alpha (alnum|'_'|'.'|'-')*;
|
|
|
|
glyph = (glyph_id | glyph_name) >tok %parse_glyph;
|
|
cluster = '=' (unum >tok %parse_cluster);
|
|
offsets = '@' (num >tok %parse_x_offset) ',' (num >tok %parse_y_offset );
|
|
advances= '+' (num >tok %parse_x_advance) (',' (num >tok %parse_y_advance))?;
|
|
|
|
codepoint = xdigit+ >tok %parse_hexdigits;
|
|
unicode_id = 'U' '+' >clear_item codepoint cluster? %add_item;
|
|
|
|
item =
|
|
(
|
|
glyph
|
|
cluster?
|
|
offsets?
|
|
advances?
|
|
)
|
|
>clear_item
|
|
%add_item
|
|
;
|
|
|
|
glyphs = item (space* '|' space* item)* space* ('|'|']')?;
|
|
unicodes = unicode_id (space* '|' space* unicode_id)* space* ('|'|'>')?;
|
|
|
|
main := space* ( ('[' glyphs) | ('<' unicodes) );
|
|
|
|
}%%
|
|
|
|
static hb_bool_t
|
|
_hb_buffer_deserialize_text (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++;
|
|
|
|
const char *eof = pe, *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_TEXT_HH */
|