1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
|
/* Evaluate shader expressions with the real compiler, for tests that need to
* compare it against something else (contrib/shadertoy.html reimplements the
* language in JavaScript, and a preview that lies is worse than none).
*
* One request per line on stdin:
*
* <x> <y> <cols> <rows> <curx> <cury> <cursor> <focused> <t> <since>
* \t<expression>
*
* One answer per line on stdout: the value, or `error: ...`.
*/
#define _GNU_SOURCE
#include "expr.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
int main(void) {
char line[4096];
while (fgets(line, sizeof line, stdin)) {
line[strcspn(line, "\r\n")] = 0;
if (!line[0]) continue;
char *tab = strchr(line, '\t');
if (!tab) {
printf("error: no expression\n");
continue;
}
*tab = 0;
expr_env_t env = {0};
long long t = 0, since = 0;
if (sscanf(line, "%d %d %d %d %d %d %d %d %lld %lld", &env.x, &env.y,
&env.cols, &env.rows, &env.curx, &env.cury, &env.cursor,
&env.focused, &t, &since) != 10) {
printf("error: bad environment\n");
continue;
}
env.t = t;
env.since = since;
char err[128] = {0};
expr_prog_t *p = expr_compile(tab + 1, err, sizeof err);
if (!p) {
printf("error: %s\n", err[0] ? err : "refused");
continue;
}
printf("%d\n", expr_eval(p, &env));
expr_free(p);
}
return 0;
}
|
