1. Java / Говнокод #9893

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    public class FSMSmilesMatcher {
	private Callback mCallback;
	private State mStartState;
	
	public interface Callback {
		public void onMatch(int matchStart, int matchEnd, int matchId);
	}
	
	//matching whole leading substring cause it's easier to build that way
	private class State {
		protected HashMap<String, State> substates; //substring which led to this state + next symbol
		protected String whole; //whole match
		protected int matchId;
		
		//result = symbols to skip before starting next match
		protected int process(String input, int matchStart, int matchEnd) {
			if(matchStart >= input.length() || matchStart >= matchEnd)
				return 0;
			if(substates == null) {
				if(whole == null || whole.length() == 0) {
					return 0; //shouldn't happen
				} else if(input.length() >= matchStart + whole.length() && input.substring(matchStart, matchStart + whole.length()).equals(whole)) {
					mCallback.onMatch(matchStart, matchStart + whole.length(), matchId);
					return whole.length()> 1 ? whole.length() - 1: 0;
				}
			} else if(matchEnd <= input.length()) {
				State nextState = substates.get(input.substring(matchStart, matchEnd));
				if(nextState != null)
					return nextState.process(input, matchStart, matchEnd + 1);
			}
			return 0;
		}
	}
	
	//checks only next symbol
	//removes long tails (into single 'whole' match)
	private class OptimizedState extends State{
		private OptimizedState(State inState) {			
			if(inState.substates != null) {
				this.substates = new HashMap<String, State>();
				for(String key : inState.substates.keySet()) {
					this.substates.put(key.substring(key.length()-1, key.length()).toLowerCase(), new OptimizedState(inState.substates.get(key)));
				}				
				if(this.substates.size() == 1) {
					State subState = this.substates.values().iterator().next();
					if(subState.substates == null) {
						this.substates = null;
						this.whole = subState.whole;
						this.matchId = subState.matchId;
					}
				}
			} else {
				this.whole = inState.whole;
				this.matchId = inState.matchId;
			}
		}
		
		@Override
		protected int process(String input, int matchStart, int matchEnd) {
			if(matchStart >= input.length() || matchStart >= matchEnd)
				return 0;
			if(substates == null) {
				if(whole == null || whole.length() == 0) {
					return 0; //shouldn't happen
				} else if(input.length() >= matchStart + whole.length() && input.substring(matchStart, matchStart + whole.length()).equalsIgnoreCase(whole)) {
					mCallback.onMatch(matchStart, matchStart + whole.length(), matchId);
					return whole.length()> 1 ? whole.length() - 1: 0;
				}
			} else if(matchEnd <= input.length()) {
				State nextState = substates.get(input.substring(matchEnd - 1, matchEnd).toLowerCase());
				if(nextState != null)
					return nextState.process(input, matchStart, matchEnd + 1);
			}
			return 0;
		}
	}

	...	

	private HashMap<String, State> generateSubstates(List<ImageMatchElement> matches, String lead) {
		List<String> variants = new ArrayList<String>();
		HashMap<String, Integer> completeMatches = new HashMap<String, Integer>();
		
		...		

		if(variants.size() == 0) {
			return null;
		} else {
			HashMap<String, State> substates = new HashMap<String, State>();
			for(String variant: variants) {
				State state = new State();
				if(completeMatches.containsKey(variant)) {
					state.whole = variant;
					state.matchId = completeMatches.get(variant);
				} else {
					state.substates = generateSubstates(matches, variant);
				}
				substates.put(variant, state);
			}
		...

    Требовалось заменить коды смайликов в текстовом сообщении заменить на соответствующие картинки (типа ":* привет :-p ^_^" заменить на "[картинка] привет [картинка] [картинка]".

    Запостил: enikey87, 09 Апреля 2012

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