@Override
public List<CandidatePattern> buildNextSubStrings(CandidatePattern subs, char c) {
LinkedList<CandidatePattern> list = new LinkedList<CandidatePattern>();
l337Context context = subs.getDecorator(l337Context.class);
if (context == null) {
context = new l337Context();
subs.addDecorator(l337Context.class, context);
}
// if we are already looking to complete a leet sequence
if (context.isIncompleteLeetSequence()) {
if (context.isMatch(c)) {
CandidatePattern newsubs = subs.copy();
// add the candidate for the next round
list.add(newsubs);
// addvance the character in the context
l337Context newContext = newsubs.getDecorator(l337Context.class);
char candidateLeetChar = newContext.currentLeetChar.normalChar;
newContext.nextChar(c);
if (!newContext.isIncompleteLeetSequence()) {
// we found a completed leet sequence, add the substiture char
newsubs.add(candidateLeetChar);
}
}
} else if (leetList.containsKey(c)) {
// if are not in a leet sequence but want to start one
Set<LeetChar> sequences = leetList.get(c);
for (LeetChar leetSequence : sequences) {
CandidatePattern newsubs = subs.copy();
l337Context newContext = newsubs.getDecorator(l337Context.class);
newContext.setCurrentLeetCandidate(leetSequence);
newContext.nextChar(c);
if (!newContext.isIncompleteLeetSequence()) {
// we found a single character leet sequence, add the substiture char
newsubs.add(leetSequence.normalChar);
}
list.add(newsubs);
}
}
if (Character.isLetter(c)) {
// we need to clone the substring for the next generation, as it is possible it will be used
// externally
CandidatePattern newsubs = subs.copy();
newsubs.add(c);
list.add(newsubs);
}
return list;
}
@Override
public boolean isMatch(CandidatePattern candidate) {
l337Context context = candidate.getDecorator(l337Context.class);
if (context == null) return false;
if (context != null && context.isIncompleteLeetSequence()) {
// if we are still seeking to complete a leet sequence then it isn't a match (yet)
return false;
}
return context.leetCount > 0;
}