static void
printree(ACISM const*psp, int state, int depth, char *str,
char const *charv, FILE*out, MEMREF const*pattv)
{
SYMBOL sym;
TRAN x;
if (depth > (int)psp->maxlen) {
fputs("oops\n", out);
return;
}
x = psp->tranv[state];
fprintf(out, "%5d:%.*s", state, depth, str);
if (t_valid(psp,x) && t_next(psp,x))
fprintf(out, " b=%"FX"d%s", t_next(psp,x), x & T_FLAGS ? " BAD" : "");
fprintf(out, "\n");
for (sym = 1; sym < psp->nsyms; ++sym) {
x = p_tran(psp, state, sym);
if (t_valid(psp, x)) {
str[depth] = charv[sym];
fprintf(out, "%*s%c %c%c",
depth+6, "", charv[sym],
x & IS_MATCH ? 'M' : '-',
x & IS_SUFFIX ? 'S' : '-');
if (x & IS_MATCH && pattv && t_isleaf(psp, x))
fprintf(out, " %.0d -> %.*s", PSTR(psp, t_strno(psp,x), pattv));
if (x & IS_SUFFIX)
fprintf(out, " ->S %"FX"d", t_next(psp, psp->tranv[state]));
fprintf(out, "\n");
if (!t_isleaf(psp, x))
printree(psp, t_next(psp, x), depth+1, str, charv, out, pattv);
}
}
}
int
acism_lookup(ac_trie_t const *psp, const char *text, size_t len,
ACISM_ACTION *cb, void *context, int *statep, bool caseless)
{
ac_trie_t const ps = *psp;
char const *cp = text, *endp = cp + len;
uint8_t s;
STATE state = *statep;
int ret = 0;
while (cp < endp) {
s = caseless ? g_ascii_tolower (*cp++) : *cp++;
_SYMBOL sym = ps.symv[s];
if (!sym) {
// Input byte is not in any pattern string.
state = ROOT;
continue;
}
// Search for a valid transition from this (state, sym),
// following the backref chain.
TRAN next;
while (!t_valid(&ps, next = p_tran(&ps, state, sym)) && state != ROOT) {
TRAN back = p_tran(&ps, state, BACK);
state = t_valid(&ps, back) ? t_next(&ps, back) : ROOT;
}
if (!t_valid(&ps, next))
continue;
if (!(next & (IS_MATCH | IS_SUFFIX))) {
// No complete match yet; keep going.
state = t_next(&ps, next);
continue;
}
// At this point, one or more patterns have matched.
// Find all matches by following the backref chain.
// A valid node for (sym) with no SUFFIX flag marks the
// end of the suffix chain.
// In the same backref traversal, find a new (state),
// if the original transition is to a leaf.
STATE s = state;
// Initially state is ROOT. The chain search saves the
// first state from which the next char has a transition.
state = t_isleaf(&ps, next) ? 0 : t_next(&ps, next);
while (1) {
if (t_valid(&ps, next)) {
if (next & IS_MATCH) {
unsigned strno, ss = s + sym, i;
if (t_isleaf(&ps, ps.tranv[ss])) {
strno = t_strno(&ps, ps.tranv[ss]);
} else {
for (i = p_hash(&ps, ss); ps.hashv[i].state != ss; ++i);
strno = ps.hashv[i].strno;
}
if ((ret = cb(strno, cp - text, context)))
goto EXIT;
}
if (!state && !t_isleaf(&ps, next))
state = t_next(&ps, next);
if ( state && !(next & IS_SUFFIX))
break;
}
if (s == ROOT)
break;
TRAN b = p_tran(&ps, s, BACK);
s = t_valid(&ps, b) ? t_next(&ps, b) : ROOT;
next = p_tran(&ps, s, sym);
}
}
EXIT:
*statep = state;
return ret;
}