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/*
* utils.h - Some helper code for debugging and error logging.
*/
#define streq(a, b) (strcmp(a, b) == 0)
// TODO: better error reporting
#define check(cond, ...) do { if (!(cond)) { fprintf(stderr, __VA_ARGS__); fwrite("\n", 1, 1, stderr); _exit(1); } } while(0)
#define debug(...) do { if (verbose) fprintf(stderr, __VA_ARGS__); } while(0)
static int verbose = 0;
static int visualize_delay = -1;
/*
* Helper function to skip past all spaces (and comments)
* Returns a pointer to the first non-space character.
*/
static inline const char *after_spaces(const char *str)
{
// Skip whitespace and comments:
skip_whitespace:
switch (*str) {
case ' ': case '\r': case '\n': case '\t': {
++str;
goto skip_whitespace;
}
case '#': {
while (*str && *str != '\n') ++str;
goto skip_whitespace;
}
}
return str;
}
static inline int matchchar(const char **str, char c)
{
*str = after_spaces(*str);
if (**str == c) {
++(*str);
return 1;
} else {
return 0;
}
}
static void visualize(const char *source, const char *ptr, const char *msg)
{
if (!verbose) return;
fprintf(stderr, "\033[0;1m\r\033[2A\033[K%.*s\033[0;2m%s\033[0m\n",
(int)(ptr-source), source, ptr);
fprintf(stderr, "\033[0;1m");
for (--ptr ; ptr > source; --ptr) putc(' ', stderr);
fprintf(stderr, "^\033[K\n");
if (msg)
fprintf(stderr, "\033[K\033[33;1m%s\033[0m", msg);
if (visualize_delay > 0)
usleep(visualize_delay);
}
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