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#include "common.h"
struct simple_pattern {
const char *match;
size_t len;
SIMPLE_PREFIX_MODE mode;
char negative;
struct simple_pattern *child;
struct simple_pattern *next;
};
static inline struct simple_pattern *parse_pattern(const char *str, SIMPLE_PREFIX_MODE default_mode) {
SIMPLE_PREFIX_MODE mode;
struct simple_pattern *child = NULL;
char *buf = strdupz(str);
char *s = buf, *c = buf;
// skip asterisks in front
while(*c == '*') c++;
// find the next asterisk
while(*c && *c != '*') c++;
// do we have an asterisk in the middle?
if(*c == '*' && c[1] != '\0') {
// yes, we have
child = parse_pattern(c, default_mode);
c[1] = '\0';
}
// check what this one matches
size_t len = strlen(s);
if(len >= 2 && *s == '*' && s[len - 1] == '*') {
s[len - 1] = '\0';
s++;
mode = SIMPLE_PATTERN_SUBSTRING;
}
else if(len >= 1 && *s == '*') {
s++;
mode = SIMPLE_PATTERN_SUFFIX;
}
else if(len >= 1 && s[len - 1] == '*') {
s[len - 1] = '\0';
mode = SIMPLE_PATTERN_PREFIX;
}
else
mode = default_mode;
// allocate the structure
struct simple_pattern *m = callocz(1, sizeof(struct simple_pattern));
if(*s) {
m->match = strdupz(s);
m->len = strlen(m->match);
m->mode = mode;
}
else {
m->mode = SIMPLE_PATTERN_SUBSTRING;
}
m->child = child;
freez(buf);
return m;
}
SIMPLE_PATTERN *simple_pattern_create(const char *list, SIMPLE_PREFIX_MODE default_mode) {
struct simple_pattern *root = NULL, *last = NULL;
if(unlikely(!list || !*list)) return root;
char *buf = strdupz(list);
if(buf && *buf) {
char *s = buf;
while(s && *s) {
char negative = 0;
// skip all spaces
while(isspace(*s)) s++;
if(*s == '!') {
negative = 1;
s++;
}
// empty string
if(unlikely(!*s)) break;
// find the next space
char *c = s;
while(*c && !isspace(*c)) c++;
// find the next word
char *n;
if(likely(*c)) n = c + 1;
else n = NULL;
// terminate our string
*c = '\0';
struct simple_pattern *m = parse_pattern(s, default_mode);
m->negative = negative;
if(likely(n)) *c = ' ';
// link it at the end
if(unlikely(!root))
root = last = m;
else {
last->next = m;
last = m;
}
// prepare for next loop
s = n;
}
}
freez(buf);
return (SIMPLE_PATTERN *)root;
}
static inline int match_pattern(struct simple_pattern *m, const char *str, size_t len) {
char *s;
if(m->len <= len) {
switch(m->mode) {
case SIMPLE_PATTERN_SUBSTRING:
if(!m->len) return 1;
if((s = strstr(str, m->match))) {
if(!m->child) return 1;
return match_pattern(m->child, &s[m->len], len - (s - str) - m->len);
}
break;
case SIMPLE_PATTERN_PREFIX:
if(unlikely(strncmp(str, m->match, m->len) == 0)) {
if(!m->child) return 1;
return match_pattern(m->child, &str[m->len], len - m->len);
}
break;
case SIMPLE_PATTERN_SUFFIX:
if(unlikely(strcmp(&str[len - m->len], m->match) == 0)) {
if(!m->child) return 1;
return 0;
}
break;
case SIMPLE_PATTERN_EXACT:
default:
if(unlikely(strcmp(str, m->match) == 0)) {
if(!m->child) return 1;
return 0;
}
break;
}
}
return 0;
}
int simple_pattern_matches(SIMPLE_PATTERN *list, const char *str) {
struct simple_pattern *m, *root = (struct simple_pattern *)list;
if(unlikely(!root || !str || !*str)) return 0;
size_t len = strlen(str);
for(m = root; m ; m = m->next)
if(match_pattern(m, str, len)) {
if(m->negative) return 0;
return 1;
}
return 0;
}
static inline void free_pattern(struct simple_pattern *m) {
if(!m) return;
free_pattern(m->child);
free_pattern(m->next);
freez((void *)m->match);
freez(m);
}
void simple_pattern_free(SIMPLE_PATTERN *list) {
if(!list) return;
free_pattern(((struct simple_pattern *)list));
}
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