/**
* Returns the found command or throws an exception.
*
* @param cmp possible completions
* @param par parent command
* @param <E> token type
* @return index
* @throws QueryException query exception
*/
private <E extends Enum<E>> E consume(final Class<E> cmp, final Cmd par) throws QueryException {
final String token = command(null);
if (!suggest || token == null || !token.isEmpty()) {
try {
// return command reference; allow empty strings as input ("NULL")
return Enum.valueOf(cmp, token == null ? "NULL" : token.toUpperCase(Locale.ENGLISH));
} catch (final IllegalArgumentException ignore) {
}
}
final Enum<?>[] alt = startWith(cmp, token);
// handle empty input
if (token == null) {
if (par != null) throw help(alt, par);
if (suggest) throw error(alt, EXPECTING_CMD);
return null;
}
// output error for similar commands
final byte[] name = uc(token(token));
final Levenshtein ls = new Levenshtein();
for (final Enum<?> s : startWith(cmp, null)) {
final byte[] sm = uc(token(s.name()));
if (ls.similar(name, sm) && Cmd.class.isInstance(s)) {
throw error(alt, UNKNOWN_SIMILAR_X, name, sm);
}
}
// show unknown command error or available command extensions
throw par == null ? error(alt, UNKNOWN_TRY_X, token) : help(alt, par);
}
/**
* Performs a fuzzy search for the specified token with a maximum number of errors.
*
* @param token token to look for
* @param k number of errors allowed
* @return iterator
*/
private synchronized IndexIterator fuzzy(final byte[] token, final int k) {
FTIndexIterator it = FTIndexIterator.FTEMPTY;
final int tokl = token.length, tl = tp.length;
final int e = Math.min(tl - 1, tokl + k);
int s = Math.max(1, tokl - k) - 1;
while (++s <= e) {
int p = tp[s];
if (p == -1) continue;
int t = s + 1, r = -1;
while (t < tl && r == -1) r = tp[t++];
while (p < r) {
if (ls.similar(inY.readBytes(p, s), token, k)) {
it = FTIndexIterator.union(iter(pointer(p, s), size(p, s), inZ, token), it);
}
p += s + ENTRY;
}
}
return it;
}