mirror of
https://github.com/ZDoom/gzdoom.git
synced 2024-11-10 14:51:40 +00:00
35 lines
1.1 KiB
C++
35 lines
1.1 KiB
C++
// Build with "--input custom" re2c switch.
|
|
//
|
|
// This is an example of handling fixed-length buffer with "--input custom":
|
|
// on each YYPEEK we check for the end of input, thus YYFILL generation
|
|
// can be safely suppressed.
|
|
//
|
|
// Note that YYLIMIT points not to terminating NULL, but to the previous
|
|
// character: we emulate the case when input has no terminating NULL.
|
|
//
|
|
// For a real-life example see https://github.com/sopyer/mjson
|
|
// or mjson.re from re2c test collection.
|
|
|
|
bool lex (const char * cursor, const char * const limit)
|
|
{
|
|
const char * marker;
|
|
const char * ctxmarker;
|
|
# define YYCTYPE char
|
|
# define YYPEEK() (cursor >= limit ? 0 : *cursor)
|
|
# define YYSKIP() ++cursor
|
|
# define YYBACKUP() marker = cursor
|
|
# define YYBACKUPCTX() ctxmarker = cursor
|
|
# define YYRESTORE() cursor = marker
|
|
# define YYRESTORECTX() cursor = ctxmarker
|
|
/*!re2c
|
|
re2c:yyfill:enable = 0;
|
|
"int buffer " / "[" [0-9]+ "]" { return true; }
|
|
* { return false; }
|
|
*/
|
|
}
|
|
|
|
int main ()
|
|
{
|
|
char buffer [] = "int buffer [1024]";
|
|
return !lex (buffer, buffer + sizeof (buffer) - 1);
|
|
}
|