Examples with RangeTransition org.antlr.v4.runtime.atn.RangeTransition used on opensource projects

Example 1 with RangeTransition

use of org.antlr.v4.runtime.atn.RangeTransition in project antlr4 by antlr.

the class ATNSerializer method serialize.

/** Serialize state descriptors, edge descriptors, and decision→state map
	 *  into list of ints:
	 *
	 * 		grammar-type, (ANTLRParser.LEXER, ...)
	 *  	max token type,
	 *  	num states,
	 *  	state-0-type ruleIndex, state-1-type ruleIndex, ... state-i-type ruleIndex optional-arg ...
	 *  	num rules,
	 *  	rule-1-start-state rule-1-args, rule-2-start-state  rule-2-args, ...
	 *  	(args are token type,actionIndex in lexer else 0,0)
	 *      num modes,
	 *      mode-0-start-state, mode-1-start-state, ... (parser has 0 modes)
	 *      num unicode-bmp-sets
	 *      bmp-set-0-interval-count intervals, bmp-set-1-interval-count intervals, ...
	 *      num unicode-smp-sets
	 *      smp-set-0-interval-count intervals, smp-set-1-interval-count intervals, ...
	 *	num total edges,
	 *      src, trg, edge-type, edge arg1, optional edge arg2 (present always), ...
	 *      num decisions,
	 *      decision-0-start-state, decision-1-start-state, ...
	 *
	 *  Convenient to pack into unsigned shorts to make as Java string.
	 */
public IntegerList serialize() {
    IntegerList data = new IntegerList();
    data.add(ATNDeserializer.SERIALIZED_VERSION);
    serializeUUID(data, ATNDeserializer.SERIALIZED_UUID);
    // convert grammar type to ATN const to avoid dependence on ANTLRParser
    data.add(atn.grammarType.ordinal());
    data.add(atn.maxTokenType);
    int nedges = 0;
    // Note that we use a LinkedHashMap as a set to
    // maintain insertion order while deduplicating
    // entries with the same key.
    Map<IntervalSet, Boolean> sets = new LinkedHashMap<>();
    // dump states, count edges and collect sets while doing so
    IntegerList nonGreedyStates = new IntegerList();
    IntegerList precedenceStates = new IntegerList();
    data.add(atn.states.size());
    for (ATNState s : atn.states) {
        if (s == null) {
            // might be optimized away
            data.add(ATNState.INVALID_TYPE);
            continue;
        }
        int stateType = s.getStateType();
        if (s instanceof DecisionState && ((DecisionState) s).nonGreedy) {
            nonGreedyStates.add(s.stateNumber);
        }
        if (s instanceof RuleStartState && ((RuleStartState) s).isLeftRecursiveRule) {
            precedenceStates.add(s.stateNumber);
        }
        data.add(stateType);
        if (s.ruleIndex == -1) {
            data.add(Character.MAX_VALUE);
        } else {
            data.add(s.ruleIndex);
        }
        if (s.getStateType() == ATNState.LOOP_END) {
            data.add(((LoopEndState) s).loopBackState.stateNumber);
        } else if (s instanceof BlockStartState) {
            data.add(((BlockStartState) s).endState.stateNumber);
        }
        if (s.getStateType() != ATNState.RULE_STOP) {
            // the deserializer can trivially derive these edges, so there's no need to serialize them
            nedges += s.getNumberOfTransitions();
        }
        for (int i = 0; i < s.getNumberOfTransitions(); i++) {
            Transition t = s.transition(i);
            int edgeType = Transition.serializationTypes.get(t.getClass());
            if (edgeType == Transition.SET || edgeType == Transition.NOT_SET) {
                SetTransition st = (SetTransition) t;
                sets.put(st.set, true);
            }
        }
    }
    // non-greedy states
    data.add(nonGreedyStates.size());
    for (int i = 0; i < nonGreedyStates.size(); i++) {
        data.add(nonGreedyStates.get(i));
    }
    // precedence states
    data.add(precedenceStates.size());
    for (int i = 0; i < precedenceStates.size(); i++) {
        data.add(precedenceStates.get(i));
    }
    int nrules = atn.ruleToStartState.length;
    data.add(nrules);
    for (int r = 0; r < nrules; r++) {
        ATNState ruleStartState = atn.ruleToStartState[r];
        data.add(ruleStartState.stateNumber);
        if (atn.grammarType == ATNType.LEXER) {
            if (atn.ruleToTokenType[r] == Token.EOF) {
                data.add(Character.MAX_VALUE);
            } else {
                data.add(atn.ruleToTokenType[r]);
            }
        }
    }
    int nmodes = atn.modeToStartState.size();
    data.add(nmodes);
    if (nmodes > 0) {
        for (ATNState modeStartState : atn.modeToStartState) {
            data.add(modeStartState.stateNumber);
        }
    }
    List<IntervalSet> bmpSets = new ArrayList<>();
    List<IntervalSet> smpSets = new ArrayList<>();
    for (IntervalSet set : sets.keySet()) {
        if (set.getMaxElement() <= Character.MAX_VALUE) {
            bmpSets.add(set);
        } else {
            smpSets.add(set);
        }
    }
    serializeSets(data, bmpSets, new CodePointSerializer() {

        @Override
        public void serializeCodePoint(IntegerList data, int cp) {
            data.add(cp);
        }
    });
    serializeSets(data, smpSets, new CodePointSerializer() {

        @Override
        public void serializeCodePoint(IntegerList data, int cp) {
            serializeInt(data, cp);
        }
    });
    Map<IntervalSet, Integer> setIndices = new HashMap<>();
    int setIndex = 0;
    for (IntervalSet bmpSet : bmpSets) {
        setIndices.put(bmpSet, setIndex++);
    }
    for (IntervalSet smpSet : smpSets) {
        setIndices.put(smpSet, setIndex++);
    }
    data.add(nedges);
    for (ATNState s : atn.states) {
        if (s == null) {
            // might be optimized away
            continue;
        }
        if (s.getStateType() == ATNState.RULE_STOP) {
            continue;
        }
        for (int i = 0; i < s.getNumberOfTransitions(); i++) {
            Transition t = s.transition(i);
            if (atn.states.get(t.target.stateNumber) == null) {
                throw new IllegalStateException("Cannot serialize a transition to a removed state.");
            }
            int src = s.stateNumber;
            int trg = t.target.stateNumber;
            int edgeType = Transition.serializationTypes.get(t.getClass());
            int arg1 = 0;
            int arg2 = 0;
            int arg3 = 0;
            switch(edgeType) {
                case Transition.RULE:
                    trg = ((RuleTransition) t).followState.stateNumber;
                    arg1 = ((RuleTransition) t).target.stateNumber;
                    arg2 = ((RuleTransition) t).ruleIndex;
                    arg3 = ((RuleTransition) t).precedence;
                    break;
                case Transition.PRECEDENCE:
                    PrecedencePredicateTransition ppt = (PrecedencePredicateTransition) t;
                    arg1 = ppt.precedence;
                    break;
                case Transition.PREDICATE:
                    PredicateTransition pt = (PredicateTransition) t;
                    arg1 = pt.ruleIndex;
                    arg2 = pt.predIndex;
                    arg3 = pt.isCtxDependent ? 1 : 0;
                    break;
                case Transition.RANGE:
                    arg1 = ((RangeTransition) t).from;
                    arg2 = ((RangeTransition) t).to;
                    if (arg1 == Token.EOF) {
                        arg1 = 0;
                        arg3 = 1;
                    }
                    break;
                case Transition.ATOM:
                    arg1 = ((AtomTransition) t).label;
                    if (arg1 == Token.EOF) {
                        arg1 = 0;
                        arg3 = 1;
                    }
                    break;
                case Transition.ACTION:
                    ActionTransition at = (ActionTransition) t;
                    arg1 = at.ruleIndex;
                    arg2 = at.actionIndex;
                    if (arg2 == -1) {
                        arg2 = 0xFFFF;
                    }
                    arg3 = at.isCtxDependent ? 1 : 0;
                    break;
                case Transition.SET:
                    arg1 = setIndices.get(((SetTransition) t).set);
                    break;
                case Transition.NOT_SET:
                    arg1 = setIndices.get(((SetTransition) t).set);
                    break;
                case Transition.WILDCARD:
                    break;
            }
            data.add(src);
            data.add(trg);
            data.add(edgeType);
            data.add(arg1);
            data.add(arg2);
            data.add(arg3);
        }
    }
    int ndecisions = atn.decisionToState.size();
    data.add(ndecisions);
    for (DecisionState decStartState : atn.decisionToState) {
        data.add(decStartState.stateNumber);
    }
    //
    if (atn.grammarType == ATNType.LEXER) {
        data.add(atn.lexerActions.length);
        for (LexerAction action : atn.lexerActions) {
            data.add(action.getActionType().ordinal());
            switch(action.getActionType()) {
                case CHANNEL:
                    int channel = ((LexerChannelAction) action).getChannel();
                    data.add(channel != -1 ? channel : 0xFFFF);
                    data.add(0);
                    break;
                case CUSTOM:
                    int ruleIndex = ((LexerCustomAction) action).getRuleIndex();
                    int actionIndex = ((LexerCustomAction) action).getActionIndex();
                    data.add(ruleIndex != -1 ? ruleIndex : 0xFFFF);
                    data.add(actionIndex != -1 ? actionIndex : 0xFFFF);
                    break;
                case MODE:
                    int mode = ((LexerModeAction) action).getMode();
                    data.add(mode != -1 ? mode : 0xFFFF);
                    data.add(0);
                    break;
                case MORE:
                    data.add(0);
                    data.add(0);
                    break;
                case POP_MODE:
                    data.add(0);
                    data.add(0);
                    break;
                case PUSH_MODE:
                    mode = ((LexerPushModeAction) action).getMode();
                    data.add(mode != -1 ? mode : 0xFFFF);
                    data.add(0);
                    break;
                case SKIP:
                    data.add(0);
                    data.add(0);
                    break;
                case TYPE:
                    int type = ((LexerTypeAction) action).getType();
                    data.add(type != -1 ? type : 0xFFFF);
                    data.add(0);
                    break;
                default:
                    String message = String.format(Locale.getDefault(), "The specified lexer action type %s is not valid.", action.getActionType());
                    throw new IllegalArgumentException(message);
            }
        }
    }
    // don't adjust the first value since that's the version number
    for (int i = 1; i < data.size(); i++) {
        if (data.get(i) < Character.MIN_VALUE || data.get(i) > Character.MAX_VALUE) {
            throw new UnsupportedOperationException("Serialized ATN data element " + data.get(i) + " element " + i + " out of range " + (int) Character.MIN_VALUE + ".." + (int) Character.MAX_VALUE);
        }
        int value = (data.get(i) + 2) & 0xFFFF;
        data.set(i, value);
    }
    return data;
}

Example 2 with RangeTransition

use of org.antlr.v4.runtime.atn.RangeTransition in project antlr4 by antlr.

the class SwiftTarget method serializeTojson.

//added by janyou -->
public String serializeTojson(ATN atn) {
    JsonObjectBuilder builder = Json.createObjectBuilder();
    builder.add("version", ATNDeserializer.SERIALIZED_VERSION);
    builder.add("uuid", ATNDeserializer.SERIALIZED_UUID.toString());
    // convert grammar type to ATN const to avoid dependence on ANTLRParser
    builder.add("grammarType", atn.grammarType.ordinal());
    builder.add("maxTokenType", atn.maxTokenType);
    //states
    int nedges = 0;
    Map<IntervalSet, Integer> setIndices = new HashMap<IntervalSet, Integer>();
    List<IntervalSet> sets = new ArrayList<IntervalSet>();
    JsonArrayBuilder statesBuilder = Json.createArrayBuilder();
    IntegerList nonGreedyStates = new IntegerList();
    IntegerList precedenceStates = new IntegerList();
    for (ATNState s : atn.states) {
        JsonObjectBuilder stateBuilder = Json.createObjectBuilder();
        if (s == null) {
            // might be optimized away
            statesBuilder.addNull();
            continue;
        }
        int stateType = s.getStateType();
        stateBuilder.add("stateType", stateType);
        //stateBuilder.add("stateNumber",s.stateNumber);
        stateBuilder.add("ruleIndex", s.ruleIndex);
        if (s instanceof DecisionState && ((DecisionState) s).nonGreedy) {
            nonGreedyStates.add(s.stateNumber);
        }
        if (s instanceof RuleStartState && ((RuleStartState) s).isLeftRecursiveRule) {
            precedenceStates.add(s.stateNumber);
        }
        if (s.getStateType() == ATNState.LOOP_END) {
            stateBuilder.add("detailStateNumber", ((LoopEndState) s).loopBackState.stateNumber);
        } else if (s instanceof BlockStartState) {
            stateBuilder.add("detailStateNumber", ((BlockStartState) s).endState.stateNumber);
        }
        if (s.getStateType() != ATNState.RULE_STOP) {
            // the deserializer can trivially derive these edges, so there's no need to serialize them
            nedges += s.getNumberOfTransitions();
        }
        for (int i = 0; i < s.getNumberOfTransitions(); i++) {
            Transition t = s.transition(i);
            int edgeType = Transition.serializationTypes.get(t.getClass());
            if (edgeType == Transition.SET || edgeType == Transition.NOT_SET) {
                SetTransition st = (SetTransition) t;
                if (!setIndices.containsKey(st.set)) {
                    sets.add(st.set);
                    setIndices.put(st.set, sets.size() - 1);
                }
            }
        }
        statesBuilder.add(stateBuilder);
    }
    builder.add("states", statesBuilder);
    // non-greedy states
    JsonArrayBuilder nonGreedyStatesBuilder = Json.createArrayBuilder();
    for (int i = 0; i < nonGreedyStates.size(); i++) {
        nonGreedyStatesBuilder.add(nonGreedyStates.get(i));
    }
    builder.add("nonGreedyStates", nonGreedyStatesBuilder);
    // precedence states
    JsonArrayBuilder precedenceStatesBuilder = Json.createArrayBuilder();
    for (int i = 0; i < precedenceStates.size(); i++) {
        precedenceStatesBuilder.add(precedenceStates.get(i));
    }
    builder.add("precedenceStates", precedenceStatesBuilder);
    JsonArrayBuilder ruleToStartStateBuilder = Json.createArrayBuilder();
    int nrules = atn.ruleToStartState.length;
    for (int r = 0; r < nrules; r++) {
        JsonObjectBuilder stateBuilder = Json.createObjectBuilder();
        ATNState ruleStartState = atn.ruleToStartState[r];
        stateBuilder.add("stateNumber", ruleStartState.stateNumber);
        if (atn.grammarType == ATNType.LEXER) {
            //				if (atn.ruleToTokenType[r] == Token.EOF) {
            //					//data.add(Character.MAX_VALUE);
            //					stateBuilder.add("ruleToTokenType",-1);
            //				}
            //				else {
            //					//data.add(atn.ruleToTokenType[r]);
            stateBuilder.add("ruleToTokenType", atn.ruleToTokenType[r]);
        //				}
        }
        ruleToStartStateBuilder.add(stateBuilder);
    }
    builder.add("ruleToStartState", ruleToStartStateBuilder);
    JsonArrayBuilder modeToStartStateBuilder = Json.createArrayBuilder();
    int nmodes = atn.modeToStartState.size();
    if (nmodes > 0) {
        for (ATNState modeStartState : atn.modeToStartState) {
            modeToStartStateBuilder.add(modeStartState.stateNumber);
        }
    }
    builder.add("modeToStartState", modeToStartStateBuilder);
    JsonArrayBuilder nsetsBuilder = Json.createArrayBuilder();
    int nsets = sets.size();
    //data.add(nsets);
    builder.add("nsets", nsets);
    for (IntervalSet set : sets) {
        JsonObjectBuilder setBuilder = Json.createObjectBuilder();
        boolean containsEof = set.contains(Token.EOF);
        if (containsEof && set.getIntervals().get(0).b == Token.EOF) {
            //data.add(set.getIntervals().size() - 1);
            setBuilder.add("size", set.getIntervals().size() - 1);
        } else {
            //data.add(set.getIntervals().size());
            setBuilder.add("size", set.getIntervals().size());
        }
        setBuilder.add("containsEof", containsEof ? 1 : 0);
        JsonArrayBuilder IntervalsBuilder = Json.createArrayBuilder();
        for (Interval I : set.getIntervals()) {
            JsonObjectBuilder IntervalBuilder = Json.createObjectBuilder();
            if (I.a == Token.EOF) {
                if (I.b == Token.EOF) {
                    continue;
                } else {
                    IntervalBuilder.add("a", 0);
                //data.add(0);
                }
            } else {
                IntervalBuilder.add("a", I.a);
            //data.add(I.a);
            }
            IntervalBuilder.add("b", I.b);
            IntervalsBuilder.add(IntervalBuilder);
        }
        setBuilder.add("Intervals", IntervalsBuilder);
        nsetsBuilder.add(setBuilder);
    }
    builder.add("IntervalSet", nsetsBuilder);
    //builder.add("nedges",nedges);
    JsonArrayBuilder allTransitionsBuilder = Json.createArrayBuilder();
    for (ATNState s : atn.states) {
        if (s == null) {
            // might be optimized away
            continue;
        }
        if (s.getStateType() == ATNState.RULE_STOP) {
            continue;
        }
        JsonArrayBuilder transitionsBuilder = Json.createArrayBuilder();
        for (int i = 0; i < s.getNumberOfTransitions(); i++) {
            JsonObjectBuilder transitionBuilder = Json.createObjectBuilder();
            Transition t = s.transition(i);
            if (atn.states.get(t.target.stateNumber) == null) {
                throw new IllegalStateException("Cannot serialize a transition to a removed state.");
            }
            int src = s.stateNumber;
            int trg = t.target.stateNumber;
            int edgeType = Transition.serializationTypes.get(t.getClass());
            int arg1 = 0;
            int arg2 = 0;
            int arg3 = 0;
            switch(edgeType) {
                case Transition.RULE:
                    trg = ((RuleTransition) t).followState.stateNumber;
                    arg1 = ((RuleTransition) t).target.stateNumber;
                    arg2 = ((RuleTransition) t).ruleIndex;
                    arg3 = ((RuleTransition) t).precedence;
                    break;
                case Transition.PRECEDENCE:
                    PrecedencePredicateTransition ppt = (PrecedencePredicateTransition) t;
                    arg1 = ppt.precedence;
                    break;
                case Transition.PREDICATE:
                    PredicateTransition pt = (PredicateTransition) t;
                    arg1 = pt.ruleIndex;
                    arg2 = pt.predIndex;
                    arg3 = pt.isCtxDependent ? 1 : 0;
                    break;
                case Transition.RANGE:
                    arg1 = ((RangeTransition) t).from;
                    arg2 = ((RangeTransition) t).to;
                    if (arg1 == Token.EOF) {
                        arg1 = 0;
                        arg3 = 1;
                    }
                    break;
                case Transition.ATOM:
                    arg1 = ((AtomTransition) t).label;
                    if (arg1 == Token.EOF) {
                        arg1 = 0;
                        arg3 = 1;
                    }
                    break;
                case Transition.ACTION:
                    ActionTransition at = (ActionTransition) t;
                    arg1 = at.ruleIndex;
                    arg2 = at.actionIndex;
                    //						if (arg2 == -1) {
                    //							arg2 = 0xFFFF;
                    //						}
                    arg3 = at.isCtxDependent ? 1 : 0;
                    break;
                case Transition.SET:
                    arg1 = setIndices.get(((SetTransition) t).set);
                    break;
                case Transition.NOT_SET:
                    arg1 = setIndices.get(((SetTransition) t).set);
                    break;
                case Transition.WILDCARD:
                    break;
            }
            transitionBuilder.add("src", src);
            transitionBuilder.add("trg", trg);
            transitionBuilder.add("edgeType", edgeType);
            transitionBuilder.add("arg1", arg1);
            transitionBuilder.add("arg2", arg2);
            transitionBuilder.add("arg3", arg3);
            transitionsBuilder.add(transitionBuilder);
        }
        allTransitionsBuilder.add(transitionsBuilder);
    }
    builder.add("allTransitionsBuilder", allTransitionsBuilder);
    int ndecisions = atn.decisionToState.size();
    //data.add(ndecisions);
    JsonArrayBuilder decisionToStateBuilder = Json.createArrayBuilder();
    for (DecisionState decStartState : atn.decisionToState) {
        //data.add(decStartState.stateNumber);
        decisionToStateBuilder.add(decStartState.stateNumber);
    }
    builder.add("decisionToState", decisionToStateBuilder);
    //
    // LEXER ACTIONS
    //
    JsonArrayBuilder lexerActionsBuilder = Json.createArrayBuilder();
    if (atn.grammarType == ATNType.LEXER) {
        //data.add(atn.lexerActions.length);
        for (LexerAction action : atn.lexerActions) {
            JsonObjectBuilder lexerActionBuilder = Json.createObjectBuilder();
            lexerActionBuilder.add("actionType", action.getActionType().ordinal());
            //data.add(action.getActionType().ordinal());
            switch(action.getActionType()) {
                case CHANNEL:
                    int channel = ((LexerChannelAction) action).getChannel();
                    lexerActionBuilder.add("a", channel);
                    lexerActionBuilder.add("b", 0);
                    break;
                case CUSTOM:
                    int ruleIndex = ((LexerCustomAction) action).getRuleIndex();
                    int actionIndex = ((LexerCustomAction) action).getActionIndex();
                    lexerActionBuilder.add("a", ruleIndex);
                    lexerActionBuilder.add("b", actionIndex);
                    break;
                case MODE:
                    int mode = ((LexerModeAction) action).getMode();
                    lexerActionBuilder.add("a", mode);
                    lexerActionBuilder.add("b", 0);
                    break;
                case MORE:
                    lexerActionBuilder.add("a", 0);
                    lexerActionBuilder.add("b", 0);
                    break;
                case POP_MODE:
                    lexerActionBuilder.add("a", 0);
                    lexerActionBuilder.add("b", 0);
                    break;
                case PUSH_MODE:
                    mode = ((LexerPushModeAction) action).getMode();
                    lexerActionBuilder.add("a", mode);
                    lexerActionBuilder.add("b", 0);
                    break;
                case SKIP:
                    lexerActionBuilder.add("a", 0);
                    lexerActionBuilder.add("b", 0);
                    break;
                case TYPE:
                    int type = ((LexerTypeAction) action).getType();
                    lexerActionBuilder.add("a", type);
                    lexerActionBuilder.add("b", 0);
                    break;
                default:
                    String message = String.format(Locale.getDefault(), "The specified lexer action type %s is not valid.", action.getActionType());
                    throw new IllegalArgumentException(message);
            }
            lexerActionsBuilder.add(lexerActionBuilder);
        }
    }
    builder.add("lexerActions", lexerActionsBuilder);
    // don't adjust the first value since that's the version number
    //		for (int i = 1; i < data.size(); i++) {
    //			if (data.get(i) < Character.MIN_VALUE || data.get(i) > Character.MAX_VALUE) {
    //				throw new UnsupportedOperationException("Serialized ATN data element out of range.");
    //			}
    //
    //			int value = (data.get(i) + 2) & 0xFFFF;
    //			data.set(i, value);
    //		}
    JsonObject data = builder.build();
    //  System.out.print(data.toString());
    return data.toString();
}

Example 3 with RangeTransition

use of org.antlr.v4.runtime.atn.RangeTransition in project antlr4 by antlr.

the class DOTGenerator method getDOT.

/** Return a String containing a DOT description that, when displayed,
     *  will show the incoming state machine visually.  All nodes reachable
     *  from startState will be included.
     */
public String getDOT(ATNState startState, String[] ruleNames, boolean isLexer) {
    if (startState == null)
        return null;
    // The output DOT graph for visualization
    Set<ATNState> markedStates = new HashSet<ATNState>();
    ST dot = stlib.getInstanceOf("atn");
    dot.add("startState", startState.stateNumber);
    dot.add("rankdir", rankdir);
    List<ATNState> work = new LinkedList<ATNState>();
    work.add(startState);
    while (!work.isEmpty()) {
        ATNState s = work.get(0);
        if (markedStates.contains(s)) {
            work.remove(0);
            continue;
        }
        markedStates.add(s);
        // don't go past end of rule node to the follow states
        if (s instanceof RuleStopState)
            continue;
        // special case: if decision point, then line up the alt start states
        // unless it's an end of block
        //			if ( s instanceof BlockStartState ) {
        //				ST rankST = stlib.getInstanceOf("decision-rank");
        //				DecisionState alt = (DecisionState)s;
        //				for (int i=0; i<alt.getNumberOfTransitions(); i++) {
        //					ATNState target = alt.transition(i).target;
        //					if ( target!=null ) {
        //						rankST.add("states", target.stateNumber);
        //					}
        //				}
        //				dot.add("decisionRanks", rankST);
        //			}
        // make a DOT edge for each transition
        ST edgeST;
        for (int i = 0; i < s.getNumberOfTransitions(); i++) {
            Transition edge = s.transition(i);
            if (edge instanceof RuleTransition) {
                RuleTransition rr = ((RuleTransition) edge);
                // don't jump to other rules, but display edge to follow node
                edgeST = stlib.getInstanceOf("edge");
                String label = "<" + ruleNames[rr.ruleIndex];
                if (((RuleStartState) rr.target).isLeftRecursiveRule) {
                    label += "[" + rr.precedence + "]";
                }
                label += ">";
                edgeST.add("label", label);
                edgeST.add("src", "s" + s.stateNumber);
                edgeST.add("target", "s" + rr.followState.stateNumber);
                edgeST.add("arrowhead", arrowhead);
                dot.add("edges", edgeST);
                work.add(rr.followState);
                continue;
            }
            if (edge instanceof ActionTransition) {
                edgeST = stlib.getInstanceOf("action-edge");
                edgeST.add("label", getEdgeLabel(edge.toString()));
            } else if (edge instanceof AbstractPredicateTransition) {
                edgeST = stlib.getInstanceOf("edge");
                edgeST.add("label", getEdgeLabel(edge.toString()));
            } else if (edge.isEpsilon()) {
                edgeST = stlib.getInstanceOf("epsilon-edge");
                edgeST.add("label", getEdgeLabel(edge.toString()));
                boolean loopback = false;
                if (edge.target instanceof PlusBlockStartState) {
                    loopback = s.equals(((PlusBlockStartState) edge.target).loopBackState);
                } else if (edge.target instanceof StarLoopEntryState) {
                    loopback = s.equals(((StarLoopEntryState) edge.target).loopBackState);
                }
                edgeST.add("loopback", loopback);
            } else if (edge instanceof AtomTransition) {
                edgeST = stlib.getInstanceOf("edge");
                AtomTransition atom = (AtomTransition) edge;
                String label = String.valueOf(atom.label);
                if (isLexer)
                    label = "'" + getEdgeLabel(new StringBuilder().appendCodePoint(atom.label).toString()) + "'";
                else if (grammar != null)
                    label = grammar.getTokenDisplayName(atom.label);
                edgeST.add("label", getEdgeLabel(label));
            } else if (edge instanceof SetTransition) {
                edgeST = stlib.getInstanceOf("edge");
                SetTransition set = (SetTransition) edge;
                String label = set.label().toString();
                if (isLexer)
                    label = set.label().toString(true);
                else if (grammar != null)
                    label = set.label().toString(grammar.getVocabulary());
                if (edge instanceof NotSetTransition)
                    label = "~" + label;
                edgeST.add("label", getEdgeLabel(label));
            } else if (edge instanceof RangeTransition) {
                edgeST = stlib.getInstanceOf("edge");
                RangeTransition range = (RangeTransition) edge;
                String label = range.label().toString();
                if (isLexer)
                    label = range.toString();
                else if (grammar != null)
                    label = range.label().toString(grammar.getVocabulary());
                edgeST.add("label", getEdgeLabel(label));
            } else {
                edgeST = stlib.getInstanceOf("edge");
                edgeST.add("label", getEdgeLabel(edge.toString()));
            }
            edgeST.add("src", "s" + s.stateNumber);
            edgeST.add("target", "s" + edge.target.stateNumber);
            edgeST.add("arrowhead", arrowhead);
            if (s.getNumberOfTransitions() > 1) {
                edgeST.add("transitionIndex", i);
            } else {
                edgeST.add("transitionIndex", false);
            }
            dot.add("edges", edgeST);
            work.add(edge.target);
        }
    }
    //		}
    for (ATNState s : markedStates) {
        if (!(s instanceof RuleStopState))
            continue;
        ST st = stlib.getInstanceOf("stopstate");
        st.add("name", "s" + s.stateNumber);
        st.add("label", getStateLabel(s));
        dot.add("states", st);
    }
    for (ATNState s : markedStates) {
        if (s instanceof RuleStopState)
            continue;
        ST st = stlib.getInstanceOf("state");
        st.add("name", "s" + s.stateNumber);
        st.add("label", getStateLabel(s));
        st.add("transitions", s.getTransitions());
        dot.add("states", st);
    }
    return dot.render();
}

Example 4 with RangeTransition

use of org.antlr.v4.runtime.atn.RangeTransition in project antlr4 by antlr.

the class ATNOptimizer method optimizeSets.

private static void optimizeSets(Grammar g, ATN atn) {
    if (g.isParser()) {
        // parser codegen doesn't currently support SetTransition
        return;
    }
    int removedStates = 0;
    List<DecisionState> decisions = atn.decisionToState;
    for (DecisionState decision : decisions) {
        if (decision.ruleIndex >= 0) {
            Rule rule = g.getRule(decision.ruleIndex);
            if (Character.isLowerCase(rule.name.charAt(0))) {
                // parser codegen doesn't currently support SetTransition
                continue;
            }
        }
        IntervalSet setTransitions = new IntervalSet();
        for (int i = 0; i < decision.getNumberOfTransitions(); i++) {
            Transition epsTransition = decision.transition(i);
            if (!(epsTransition instanceof EpsilonTransition)) {
                continue;
            }
            if (epsTransition.target.getNumberOfTransitions() != 1) {
                continue;
            }
            Transition transition = epsTransition.target.transition(0);
            if (!(transition.target instanceof BlockEndState)) {
                continue;
            }
            if (transition instanceof NotSetTransition) {
                // TODO: not yet implemented
                continue;
            }
            if (transition instanceof AtomTransition || transition instanceof RangeTransition || transition instanceof SetTransition) {
                setTransitions.add(i);
            }
        }
        // due to min alt resolution policies, can only collapse sequential alts
        for (int i = setTransitions.getIntervals().size() - 1; i >= 0; i--) {
            Interval interval = setTransitions.getIntervals().get(i);
            if (interval.length() <= 1) {
                continue;
            }
            ATNState blockEndState = decision.transition(interval.a).target.transition(0).target;
            IntervalSet matchSet = new IntervalSet();
            for (int j = interval.a; j <= interval.b; j++) {
                Transition matchTransition = decision.transition(j).target.transition(0);
                if (matchTransition instanceof NotSetTransition) {
                    throw new UnsupportedOperationException("Not yet implemented.");
                }
                IntervalSet set = matchTransition.label();
                List<Interval> intervals = set.getIntervals();
                int n = intervals.size();
                for (int k = 0; k < n; k++) {
                    Interval setInterval = intervals.get(k);
                    int a = setInterval.a;
                    int b = setInterval.b;
                    if (a != -1 && b != -1) {
                        for (int v = a; v <= b; v++) {
                            if (matchSet.contains(v)) {
                                // TODO: Token is missing (i.e. position in source will not be displayed).
                                g.tool.errMgr.grammarError(ErrorType.CHARACTERS_COLLISION_IN_SET, g.fileName, null, CharSupport.getANTLRCharLiteralForChar(v), CharSupport.getIntervalSetEscapedString(matchSet));
                                break;
                            }
                        }
                    }
                }
                matchSet.addAll(set);
            }
            Transition newTransition;
            if (matchSet.getIntervals().size() == 1) {
                if (matchSet.size() == 1) {
                    newTransition = CodePointTransitions.createWithCodePoint(blockEndState, matchSet.getMinElement());
                } else {
                    Interval matchInterval = matchSet.getIntervals().get(0);
                    newTransition = CodePointTransitions.createWithCodePointRange(blockEndState, matchInterval.a, matchInterval.b);
                }
            } else {
                newTransition = new SetTransition(blockEndState, matchSet);
            }
            decision.transition(interval.a).target.setTransition(0, newTransition);
            for (int j = interval.a + 1; j <= interval.b; j++) {
                Transition removed = decision.removeTransition(interval.a + 1);
                atn.removeState(removed.target);
                removedStates++;
            }
        }
    }
//		System.out.println("ATN optimizer removed " + removedStates + " states by collapsing sets.");
}