mirror of
https://github.com/ZDoom/raze-gles.git
synced 2024-11-13 07:58:04 +00:00
8c95516224
- updaterevision for automated revision string generation - re2c as a prerequisite to use sc_man in the future - zipdir to automatically generate an engine resource file.
61 lines
1.6 KiB
C++
61 lines
1.6 KiB
C++
/* re2c lesson 001_upn_calculator, calc_003, (c) M. Boerger 2006 - 2007 */
|
|
/*!ignore:re2c
|
|
|
|
- making use of YYFILL
|
|
|
|
. Again provide the length of the input to generate the limit only once. Now
|
|
we can use YYFILL() to detect the end and simply return since YYFILL() is
|
|
only being used if the next scanner run might use more chars then YYLIMIT
|
|
allows.
|
|
. Note that we now use (s+l+2) instead of (s+l) as we did in lesson_001. In
|
|
the first lesson we did not quit from YYFILL() and used a special rule to
|
|
detect the end of input. Here we use the fact that we know the exact end
|
|
of input and that this length does not include the terminating zero. Since
|
|
YYLIMIT points to the first character behind the used buffer we use "+ 2".
|
|
If we would use "+1" we could drop the "\000" rule but could no longer
|
|
distinguish between end of input and out of data.
|
|
|
|
*/
|
|
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
|
|
int scan(char *s, int l)
|
|
{
|
|
char *p = s;
|
|
char *q = 0;
|
|
#define YYCTYPE char
|
|
#define YYCURSOR p
|
|
#define YYLIMIT (s+l+2)
|
|
#define YYMARKER q
|
|
#define YYFILL(n) { printf("OOD\n"); return 2; }
|
|
|
|
for(;;)
|
|
{
|
|
/*!re2c
|
|
re2c:indent:top = 2;
|
|
"0"[0-9]+ { printf("Oct\n"); continue; }
|
|
[1-9][0-9]* { printf("Num\n"); continue; }
|
|
"0" { printf("Num\n"); continue; }
|
|
"+" { printf("+\n"); continue; }
|
|
"-" { printf("+\n"); continue; }
|
|
"\000" { printf("EOF\n"); return 0; }
|
|
[^] { printf("ERR\n"); return 1; }
|
|
*/
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int main(int argc, char **argv)
|
|
{
|
|
if (argc > 1)
|
|
{
|
|
return scan(argv[1], strlen(argv[1]));
|
|
}
|
|
else
|
|
{
|
|
fprintf(stderr, "%s <expr>\n", argv[0]);
|
|
return 0;
|
|
}
|
|
}
|