public void TestMixedRangesAndElements()
{
IntervalSet s = new IntervalSet();
s.Add(1);
s.Add('a', 'z');
s.Add('0', '9');
String expecting = "{1, 48..57, 97..122}";
Assert.AreEqual(s.ToString(), expecting);
}
public void TestIsolatedElements()
{
IntervalSet s = new IntervalSet();
s.Add(1);
s.Add('z');
s.Add('\uFFF0');
String expecting = "{1, 122, 65520}";
Assert.AreEqual(s.ToString(), expecting);
}
public static Antlr4.Runtime.Misc.IntervalSet Of(int a)
{
Antlr4.Runtime.Misc.IntervalSet s = new Antlr4.Runtime.Misc.IntervalSet();
s.Add(a);
return(s);
}
public static IntervalSet ToSet(BitSet bits)
{
IntervalSet s = new IntervalSet();
int i = bits.NextSetBit(0);
while (i >= 0)
{
s.Add(i);
i = bits.NextSetBit(i + 1);
}
return(s);
}
protected internal virtual IList<IntervalSet> ReadSets(ATN atn)
{
//
// SETS
//
IList<IntervalSet> sets = new List<IntervalSet>();
int nsets = ReadInt();
for (int i_8 = 0; i_8 < nsets; i_8++)
{
IntervalSet set = new IntervalSet();
sets.Add(set);
int nintervals = ReadInt();
bool containsEof = ReadInt() != 0;
if (containsEof)
{
set.Add(-1);
}
for (int j = 0; j < nintervals; j++)
{
set.Add(ReadInt(), ReadInt());
}
}
return sets;
}
private static int OptimizeSets(ATN atn, bool preserveOrder)
{
if (preserveOrder)
{
// this optimization currently doesn't preserve edge order.
return 0;
}
int removedPaths = 0;
IList<DecisionState> decisions = atn.decisionToState;
foreach (DecisionState decision in decisions)
{
IntervalSet setTransitions = new IntervalSet();
for (int i = 0; i < decision.NumberOfOptimizedTransitions; i++)
{
Transition epsTransition = decision.GetOptimizedTransition(i);
if (!(epsTransition is EpsilonTransition))
{
continue;
}
if (epsTransition.target.NumberOfOptimizedTransitions != 1)
{
continue;
}
Transition transition = epsTransition.target.GetOptimizedTransition(0);
if (!(transition.target is BlockEndState))
{
continue;
}
if (transition is NotSetTransition)
{
// TODO: not yet implemented
continue;
}
if (transition is AtomTransition || transition is RangeTransition || transition is SetTransition)
{
setTransitions.Add(i);
}
}
if (setTransitions.Count <= 1)
{
continue;
}
IList<Transition> optimizedTransitions = new List<Transition>();
for (int i_1 = 0; i_1 < decision.NumberOfOptimizedTransitions; i_1++)
{
if (!setTransitions.Contains(i_1))
{
optimizedTransitions.Add(decision.GetOptimizedTransition(i_1));
}
}
ATNState blockEndState = decision.GetOptimizedTransition(setTransitions.MinElement).target.GetOptimizedTransition(0).target;
IntervalSet matchSet = new IntervalSet();
for (int i_2 = 0; i_2 < setTransitions.GetIntervals().Count; i_2++)
{
Interval interval = setTransitions.GetIntervals()[i_2];
for (int j = interval.a; j <= interval.b; j++)
{
Transition matchTransition = decision.GetOptimizedTransition(j).target.GetOptimizedTransition(0);
if (matchTransition is NotSetTransition)
{
throw new NotSupportedException("Not yet implemented.");
}
else
{
matchSet.AddAll(matchTransition.Label);
}
}
}
Transition newTransition;
if (matchSet.GetIntervals().Count == 1)
{
if (matchSet.Count == 1)
{
newTransition = new AtomTransition(blockEndState, matchSet.MinElement);
}
else
{
Interval matchInterval = matchSet.GetIntervals()[0];
newTransition = new RangeTransition(blockEndState, matchInterval.a, matchInterval.b);
}
}
else
{
newTransition = new SetTransition(blockEndState, matchSet);
}
ATNState setOptimizedState = new BasicState();
setOptimizedState.SetRuleIndex(decision.ruleIndex);
atn.AddState(setOptimizedState);
setOptimizedState.AddTransition(newTransition);
optimizedTransitions.Add(new EpsilonTransition(setOptimizedState));
removedPaths += decision.NumberOfOptimizedTransitions - optimizedTransitions.Count;
if (decision.IsOptimized)
{
while (decision.NumberOfOptimizedTransitions > 0)
{
decision.RemoveOptimizedTransition(decision.NumberOfOptimizedTransitions - 1);
}
}
foreach (Transition transition_1 in optimizedTransitions)
{
decision.AddOptimizedTransition(transition_1);
}
}
return removedPaths;
}
public void TestMergeWhereAdditionMergesThreeExistingIntervals()
{
IntervalSet s = new IntervalSet();
s.Add(0);
s.Add(3);
s.Add(5);
s.Add(0, 7);
String expecting = "{0..7}";
String result = s.ToString();
Assert.AreEqual(expecting, result);
}
public virtual IntervalSet GetExpectedTokens(int stateNumber, RuleContext context)
{
if (stateNumber < 0 || stateNumber >= states.Count)
{
throw new ArgumentException("Invalid state number.");
}
RuleContext ctx = context;
ATNState s = states[stateNumber];
IntervalSet following = NextTokens(s);
if (!following.Contains(TokenConstants.Epsilon))
{
return following;
}
IntervalSet expected = new IntervalSet();
expected.AddAll(following);
expected.Remove(TokenConstants.Epsilon);
while (ctx != null && ctx.invokingState >= 0 && following.Contains(TokenConstants.Epsilon))
{
ATNState invokingState = states[ctx.invokingState];
RuleTransition rt = (RuleTransition)invokingState.Transition(0);
following = NextTokens(rt.followState);
expected.AddAll(following);
expected.Remove(TokenConstants.Epsilon);
ctx = ctx.parent;
}
if (following.Contains(TokenConstants.Epsilon))
{
expected.Add(TokenConstants.Eof);
}
return expected;
}
protected int getAltThatFinishedDecisionEntryRule(ATNConfigSet configSet)
{
IntervalSet alts = new IntervalSet();
foreach (ATNConfig c in configSet.configs)
{
if (c.OuterContextDepth > 0 || (c.state is RuleStopState && c.context.HasEmptyPath))
{
alts.Add(c.alt);
}
}
if (alts.Count == 0) return ATN.INVALID_ALT_NUMBER;
return alts.MinElement;
}
public virtual ATN Deserialize(char[] data)
{
data = (char[])data.Clone();
// don't adjust the first value since that's the version number
for (int i = 1; i < data.Length; i++)
{
data[i] = (char)(data[i] - 2);
}
int p = 0;
int version = ToInt(data[p++]);
if (version != SerializedVersion)
{
string reason = string.Format(CultureInfo.CurrentCulture, "Could not deserialize ATN with version {0} (expected {1}).", version, SerializedVersion);
throw new NotSupportedException(reason);
}
Guid uuid = ToUUID(data, p);
p += 8;
if (!SupportedUuids.Contains(uuid))
{
string reason = string.Format(CultureInfo.CurrentCulture, "Could not deserialize ATN with UUID {0} (expected {1} or a legacy UUID).", uuid, SerializedUuid);
throw new NotSupportedException(reason);
}
bool supportsLexerActions = IsFeatureSupported(AddedLexerActions, uuid);
ATNType grammarType = (ATNType)ToInt(data[p++]);
int maxTokenType = ToInt(data[p++]);
ATN atn = new ATN(grammarType, maxTokenType);
//
// STATES
//
IList<Tuple<LoopEndState, int>> loopBackStateNumbers = new List<Tuple<LoopEndState, int>>();
IList<Tuple<BlockStartState, int>> endStateNumbers = new List<Tuple<BlockStartState, int>>();
int nstates = ToInt(data[p++]);
for (int i_1 = 0; i_1 < nstates; i_1++)
{
StateType stype = (StateType)ToInt(data[p++]);
// ignore bad type of states
if (stype == StateType.InvalidType)
{
atn.AddState(null);
continue;
}
int ruleIndex = ToInt(data[p++]);
if (ruleIndex == char.MaxValue)
{
ruleIndex = -1;
}
ATNState s = StateFactory(stype, ruleIndex);
if (stype == StateType.LoopEnd)
{
// special case
int loopBackStateNumber = ToInt(data[p++]);
loopBackStateNumbers.Add(Tuple.Create((LoopEndState)s, loopBackStateNumber));
}
else
{
if (s is BlockStartState)
{
int endStateNumber = ToInt(data[p++]);
endStateNumbers.Add(Tuple.Create((BlockStartState)s, endStateNumber));
}
}
atn.AddState(s);
}
// delay the assignment of loop back and end states until we know all the state instances have been initialized
foreach (Tuple<LoopEndState, int> pair in loopBackStateNumbers)
{
pair.Item1.loopBackState = atn.states[pair.Item2];
}
foreach (Tuple<BlockStartState, int> pair_1 in endStateNumbers)
{
pair_1.Item1.endState = (BlockEndState)atn.states[pair_1.Item2];
}
int numNonGreedyStates = ToInt(data[p++]);
for (int i_2 = 0; i_2 < numNonGreedyStates; i_2++)
{
int stateNumber = ToInt(data[p++]);
((DecisionState)atn.states[stateNumber]).nonGreedy = true;
}
int numSllDecisions = ToInt(data[p++]);
for (int i_3 = 0; i_3 < numSllDecisions; i_3++)
{
int stateNumber = ToInt(data[p++]);
((DecisionState)atn.states[stateNumber]).sll = true;
}
int numPrecedenceStates = ToInt(data[p++]);
for (int i_4 = 0; i_4 < numPrecedenceStates; i_4++)
{
int stateNumber = ToInt(data[p++]);
((RuleStartState)atn.states[stateNumber]).isPrecedenceRule = true;
}
//
// RULES
//
int nrules = ToInt(data[p++]);
if (atn.grammarType == ATNType.Lexer)
{
atn.ruleToTokenType = new int[nrules];
}
atn.ruleToStartState = new RuleStartState[nrules];
for (int i_5 = 0; i_5 < nrules; i_5++)
{
int s = ToInt(data[p++]);
RuleStartState startState = (RuleStartState)atn.states[s];
startState.leftFactored = ToInt(data[p++]) != 0;
atn.ruleToStartState[i_5] = startState;
if (atn.grammarType == ATNType.Lexer)
{
int tokenType = ToInt(data[p++]);
if (tokenType == unchecked((int)(0xFFFF)))
{
tokenType = TokenConstants.Eof;
}
atn.ruleToTokenType[i_5] = tokenType;
if (!IsFeatureSupported(AddedLexerActions, uuid))
{
// this piece of unused metadata was serialized prior to the
// addition of LexerAction
int actionIndexIgnored = ToInt(data[p++]);
if (actionIndexIgnored == unchecked((int)(0xFFFF)))
{
actionIndexIgnored = -1;
}
}
}
}
atn.ruleToStopState = new RuleStopState[nrules];
foreach (ATNState state in atn.states)
{
if (!(state is RuleStopState))
{
continue;
}
RuleStopState stopState = (RuleStopState)state;
atn.ruleToStopState[state.ruleIndex] = stopState;
atn.ruleToStartState[state.ruleIndex].stopState = stopState;
}
//
// MODES
//
int nmodes = ToInt(data[p++]);
for (int i_6 = 0; i_6 < nmodes; i_6++)
{
int s = ToInt(data[p++]);
atn.modeToStartState.Add((TokensStartState)atn.states[s]);
}
atn.modeToDFA = new DFA[nmodes];
for (int i_7 = 0; i_7 < nmodes; i_7++)
{
atn.modeToDFA[i_7] = new DFA(atn.modeToStartState[i_7]);
}
//
// SETS
//
IList<IntervalSet> sets = new List<IntervalSet>();
int nsets = ToInt(data[p++]);
for (int i_8 = 0; i_8 < nsets; i_8++)
{
int nintervals = ToInt(data[p]);
p++;
IntervalSet set = new IntervalSet();
sets.Add(set);
bool containsEof = ToInt(data[p++]) != 0;
if (containsEof)
{
set.Add(-1);
}
for (int j = 0; j < nintervals; j++)
{
set.Add(ToInt(data[p]), ToInt(data[p + 1]));
p += 2;
}
}
//
// EDGES
//
int nedges = ToInt(data[p++]);
for (int i_9 = 0; i_9 < nedges; i_9++)
{
int src = ToInt(data[p]);
int trg = ToInt(data[p + 1]);
TransitionType ttype = (TransitionType)ToInt(data[p + 2]);
int arg1 = ToInt(data[p + 3]);
int arg2 = ToInt(data[p + 4]);
int arg3 = ToInt(data[p + 5]);
Transition trans = EdgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);
// System.out.println("EDGE "+trans.getClass().getSimpleName()+" "+
// src+"->"+trg+
// " "+Transition.serializationNames[ttype]+
// " "+arg1+","+arg2+","+arg3);
ATNState srcState = atn.states[src];
srcState.AddTransition(trans);
p += 6;
}
// edges for rule stop states can be derived, so they aren't serialized
// Map rule stop state -> return state -> outermost precedence return
HashSet<Tuple<int, int, int>> returnTransitionsSet = new HashSet<Tuple<int, int, int>>();
List<Tuple<int, int, int>> returnTransitions = new List<Tuple<int, int, int>>();
foreach (ATNState state_1 in atn.states)
{
bool returningToLeftFactored = state_1.ruleIndex >= 0 && atn.ruleToStartState[state_1.ruleIndex].leftFactored;
for (int i_10 = 0; i_10 < state_1.NumberOfTransitions; i_10++)
{
Transition t = state_1.Transition(i_10);
if (!(t is RuleTransition))
{
continue;
}
RuleTransition ruleTransition = (RuleTransition)t;
bool returningFromLeftFactored = atn.ruleToStartState[ruleTransition.target.ruleIndex].leftFactored;
if (!returningFromLeftFactored && returningToLeftFactored)
{
continue;
}
int outermostPrecedenceReturn = -1;
if (atn.ruleToStartState[ruleTransition.target.ruleIndex].isPrecedenceRule)
{
if (ruleTransition.precedence == 0)
{
outermostPrecedenceReturn = ruleTransition.target.ruleIndex;
}
}
var returnTransition = Tuple.Create(ruleTransition.target.ruleIndex, ruleTransition.followState.stateNumber, outermostPrecedenceReturn);
if (returnTransitionsSet.Add(returnTransition))
returnTransitions.Add(returnTransition);
}
}
// Add all elements from returnTransitions to the ATN
foreach (Tuple<int, int, int> returnTransition in returnTransitions)
{
EpsilonTransition transition = new EpsilonTransition(atn.states[returnTransition.Item2], returnTransition.Item3);
atn.ruleToStopState[returnTransition.Item1].AddTransition(transition);
}
foreach (ATNState state_2 in atn.states)
{
if (state_2 is BlockStartState)
{
// we need to know the end state to set its start state
if (((BlockStartState)state_2).endState == null)
{
throw new InvalidOperationException();
}
// block end states can only be associated to a single block start state
if (((BlockStartState)state_2).endState.startState != null)
{
throw new InvalidOperationException();
}
((BlockStartState)state_2).endState.startState = (BlockStartState)state_2;
}
if (state_2 is PlusLoopbackState)
{
PlusLoopbackState loopbackState = (PlusLoopbackState)state_2;
for (int i_10 = 0; i_10 < loopbackState.NumberOfTransitions; i_10++)
{
ATNState target = loopbackState.Transition(i_10).target;
if (target is PlusBlockStartState)
{
((PlusBlockStartState)target).loopBackState = loopbackState;
}
}
}
else
{
if (state_2 is StarLoopbackState)
{
StarLoopbackState loopbackState = (StarLoopbackState)state_2;
for (int i_10 = 0; i_10 < loopbackState.NumberOfTransitions; i_10++)
{
ATNState target = loopbackState.Transition(i_10).target;
if (target is StarLoopEntryState)
{
((StarLoopEntryState)target).loopBackState = loopbackState;
}
}
}
}
}
//
// DECISIONS
//
int ndecisions = ToInt(data[p++]);
for (int i_11 = 1; i_11 <= ndecisions; i_11++)
{
int s = ToInt(data[p++]);
DecisionState decState = (DecisionState)atn.states[s];
atn.decisionToState.Add(decState);
decState.decision = i_11 - 1;
}
//
// LEXER ACTIONS
//
if (atn.grammarType == ATNType.Lexer)
{
if (supportsLexerActions)
{
atn.lexerActions = new ILexerAction[ToInt(data[p++])];
for (int i_10 = 0; i_10 < atn.lexerActions.Length; i_10++)
{
LexerActionType actionType = (LexerActionType)ToInt(data[p++]);
int data1 = ToInt(data[p++]);
if (data1 == unchecked((int)(0xFFFF)))
{
data1 = -1;
}
int data2 = ToInt(data[p++]);
if (data2 == unchecked((int)(0xFFFF)))
{
data2 = -1;
}
ILexerAction lexerAction = LexerActionFactory(actionType, data1, data2);
atn.lexerActions[i_10] = lexerAction;
}
}
else
{
// for compatibility with older serialized ATNs, convert the old
// serialized action index for action transitions to the new
// form, which is the index of a LexerCustomAction
List<ILexerAction> legacyLexerActions = new List<ILexerAction>();
foreach (ATNState state_3 in atn.states)
{
for (int i_10 = 0; i_10 < state_3.NumberOfTransitions; i_10++)
{
Transition transition = state_3.Transition(i_10);
if (!(transition is ActionTransition))
{
continue;
}
int ruleIndex = ((ActionTransition)transition).ruleIndex;
int actionIndex = ((ActionTransition)transition).actionIndex;
LexerCustomAction lexerAction = new LexerCustomAction(ruleIndex, actionIndex);
state_3.SetTransition(i_10, new ActionTransition(transition.target, ruleIndex, legacyLexerActions.Count, false));
legacyLexerActions.Add(lexerAction);
}
}
atn.lexerActions = legacyLexerActions.ToArray();
}
}
MarkPrecedenceDecisions(atn);
atn.decisionToDFA = new DFA[ndecisions];
for (int i_12 = 0; i_12 < ndecisions; i_12++)
{
atn.decisionToDFA[i_12] = new DFA(atn.decisionToState[i_12], i_12);
}
if (deserializationOptions.VerifyAtn)
{
VerifyATN(atn);
}
if (deserializationOptions.GenerateRuleBypassTransitions && atn.grammarType == ATNType.Parser)
{
atn.ruleToTokenType = new int[atn.ruleToStartState.Length];
for (int i_10 = 0; i_10 < atn.ruleToStartState.Length; i_10++)
{
atn.ruleToTokenType[i_10] = atn.maxTokenType + i_10 + 1;
}
for (int i_13 = 0; i_13 < atn.ruleToStartState.Length; i_13++)
{
BasicBlockStartState bypassStart = new BasicBlockStartState();
bypassStart.ruleIndex = i_13;
atn.AddState(bypassStart);
BlockEndState bypassStop = new BlockEndState();
bypassStop.ruleIndex = i_13;
atn.AddState(bypassStop);
bypassStart.endState = bypassStop;
atn.DefineDecisionState(bypassStart);
bypassStop.startState = bypassStart;
ATNState endState;
Transition excludeTransition = null;
if (atn.ruleToStartState[i_13].isPrecedenceRule)
{
// wrap from the beginning of the rule to the StarLoopEntryState
endState = null;
foreach (ATNState state_3 in atn.states)
{
if (state_3.ruleIndex != i_13)
{
continue;
}
if (!(state_3 is StarLoopEntryState))
{
continue;
}
ATNState maybeLoopEndState = state_3.Transition(state_3.NumberOfTransitions - 1).target;
if (!(maybeLoopEndState is LoopEndState))
{
continue;
}
if (maybeLoopEndState.epsilonOnlyTransitions && maybeLoopEndState.Transition(0).target is RuleStopState)
{
endState = state_3;
break;
}
}
if (endState == null)
{
throw new NotSupportedException("Couldn't identify final state of the precedence rule prefix section.");
}
excludeTransition = ((StarLoopEntryState)endState).loopBackState.Transition(0);
}
else
{
endState = atn.ruleToStopState[i_13];
}
// all non-excluded transitions that currently target end state need to target blockEnd instead
foreach (ATNState state_4 in atn.states)
{
foreach (Transition transition in state_4.transitions)
{
if (transition == excludeTransition)
{
continue;
}
if (transition.target == endState)
{
transition.target = bypassStop;
}
}
}
// all transitions leaving the rule start state need to leave blockStart instead
while (atn.ruleToStartState[i_13].NumberOfTransitions > 0)
{
Transition transition = atn.ruleToStartState[i_13].Transition(atn.ruleToStartState[i_13].NumberOfTransitions - 1);
atn.ruleToStartState[i_13].RemoveTransition(atn.ruleToStartState[i_13].NumberOfTransitions - 1);
bypassStart.AddTransition(transition);
}
// link the new states
atn.ruleToStartState[i_13].AddTransition(new EpsilonTransition(bypassStart));
bypassStop.AddTransition(new EpsilonTransition(endState));
ATNState matchState = new BasicState();
atn.AddState(matchState);
matchState.AddTransition(new AtomTransition(bypassStop, atn.ruleToTokenType[i_13]));
bypassStart.AddTransition(new EpsilonTransition(matchState));
}
if (deserializationOptions.VerifyAtn)
{
// reverify after modification
VerifyATN(atn);
}
}
if (deserializationOptions.Optimize)
{
while (true)
{
int optimizationCount = 0;
optimizationCount += InlineSetRules(atn);
optimizationCount += CombineChainedEpsilons(atn);
bool preserveOrder = atn.grammarType == ATNType.Lexer;
optimizationCount += OptimizeSets(atn, preserveOrder);
if (optimizationCount == 0)
{
break;
}
}
if (deserializationOptions.VerifyAtn)
{
// reverify after modification
VerifyATN(atn);
}
}
IdentifyTailCalls(atn);
return atn;
}
/// <summary>Create a set with all ints within range [a..b] (inclusive)</summary>
public static Antlr4.Runtime.Misc.IntervalSet Of(int a, int b)
{
Antlr4.Runtime.Misc.IntervalSet s = new Antlr4.Runtime.Misc.IntervalSet();
s.Add(a, b);
return s;
}
/// <summary>
/// Compute set of tokens that can follow
/// <code>s</code>
/// in the ATN in the
/// specified
/// <code>ctx</code>
/// .
/// <p/>
/// If
/// <code>ctx</code>
/// is
/// <see cref="PredictionContext.EmptyLocal">PredictionContext.EmptyLocal</see>
/// and
/// <code>stopState</code>
/// or the end of the rule containing
/// <code>s</code>
/// is reached,
/// <see cref="TokenConstants.Epsilon"/>
/// is added to the result set. If
/// <code>ctx</code>
/// is not
/// <see cref="PredictionContext.EmptyLocal">PredictionContext.EmptyLocal</see>
/// and
/// <code>addEOF</code>
/// is
/// <code>true</code>
/// and
/// <code>stopState</code>
/// or the end of the outermost rule is reached,
/// <see cref="TokenConstants.Eof"/>
/// is added to the result set.
/// </summary>
/// <param name="s">the ATN state.</param>
/// <param name="stopState">
/// the ATN state to stop at. This can be a
/// <see cref="BlockEndState">BlockEndState</see>
/// to detect epsilon paths through a closure.
/// </param>
/// <param name="ctx">
/// The outer context, or
/// <see cref="PredictionContext.EmptyLocal">PredictionContext.EmptyLocal</see>
/// if
/// the outer context should not be used.
/// </param>
/// <param name="look">The result lookahead set.</param>
/// <param name="lookBusy">
/// A set used for preventing epsilon closures in the ATN
/// from causing a stack overflow. Outside code should pass
/// <code>new HashSet<ATNConfig></code>
/// for this argument.
/// </param>
/// <param name="calledRuleStack">
/// A set used for preventing left recursion in the
/// ATN from causing a stack overflow. Outside code should pass
/// <code>new BitSet()</code>
/// for this argument.
/// </param>
/// <param name="seeThruPreds">
///
/// <code>true</code>
/// to true semantic predicates as
/// implicitly
/// <code>true</code>
/// and "see through them", otherwise
/// <code>false</code>
/// to treat semantic predicates as opaque and add
/// <see cref="HitPred">HitPred</see>
/// to the
/// result if one is encountered.
/// </param>
/// <param name="addEOF">
/// Add
/// <see cref="TokenConstants.Eof"/>
/// to the result if the end of the
/// outermost context is reached. This parameter has no effect if
/// <code>ctx</code>
/// is
/// <see cref="PredictionContext.EmptyLocal">PredictionContext.EmptyLocal</see>
/// .
/// </param>
protected internal virtual void Look(ATNState s, ATNState stopState, PredictionContext
ctx, IntervalSet look, HashSet<ATNConfig> lookBusy, BitSet calledRuleStack,
bool seeThruPreds, bool addEOF)
{
// System.out.println("_LOOK("+s.stateNumber+", ctx="+ctx);
ATNConfig c = ATNConfig.Create(s, 0, ctx);
if (!lookBusy.Add(c))
{
return;
}
if (s == stopState)
{
if (PredictionContext.IsEmptyLocal(ctx))
{
look.Add(TokenConstants.Epsilon);
return;
}
else
{
if (ctx.IsEmpty && addEOF)
{
look.Add(TokenConstants.Eof);
return;
}
}
}
if (s is RuleStopState)
{
if (PredictionContext.IsEmptyLocal(ctx))
{
look.Add(TokenConstants.Epsilon);
return;
}
else
{
if (ctx.IsEmpty && addEOF)
{
look.Add(TokenConstants.Eof);
return;
}
}
for (int i = 0; i < ctx.Size; i++)
{
if (ctx.GetReturnState(i) != PredictionContext.EmptyFullStateKey)
{
ATNState returnState = atn.states[ctx.GetReturnState(i)];
// System.out.println("popping back to "+retState);
for (int j = 0; j < ctx.Size; j++)
{
bool removed = calledRuleStack.Get(returnState.ruleIndex);
try
{
calledRuleStack.Clear(returnState.ruleIndex);
Look(returnState, stopState, ctx.GetParent(j), look, lookBusy, calledRuleStack, seeThruPreds
, addEOF);
}
finally
{
if (removed)
{
calledRuleStack.Set(returnState.ruleIndex);
}
}
}
return;
}
}
}
int n = s.NumberOfTransitions;
for (int i_1 = 0; i_1 < n; i_1++)
{
Transition t = s.Transition(i_1);
if (t.GetType() == typeof(RuleTransition))
{
if (calledRuleStack.Get(((RuleTransition)t).target.ruleIndex))
{
continue;
}
PredictionContext newContext = ctx.GetChild(((RuleTransition)t).followState.stateNumber
);
try
{
calledRuleStack.Set(((RuleTransition)t).target.ruleIndex);
Look(t.target, stopState, newContext, look, lookBusy, calledRuleStack, seeThruPreds
, addEOF);
}
finally
{
calledRuleStack.Clear(((RuleTransition)t).target.ruleIndex);
}
}
else
{
if (t is AbstractPredicateTransition)
{
if (seeThruPreds)
{
Look(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF
);
}
else
{
look.Add(HitPred);
}
}
else
{
if (t.IsEpsilon)
{
Look(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF
);
}
else
{
if (t.GetType() == typeof(WildcardTransition))
{
look.AddAll(IntervalSet.Of(TokenConstants.MinUserTokenType, atn.maxTokenType));
}
else
{
// System.out.println("adding "+ t);
IntervalSet set = t.Label;
if (set != null)
{
if (t is NotSetTransition)
{
set = set.Complement(IntervalSet.Of(TokenConstants.MinUserTokenType, atn.maxTokenType
));
}
look.AddAll(set);
}
}
}
}
}
}
}
public static ATN Deserialize(char[] data, bool optimize)
{
data = (char[])data.Clone();
// don't adjust the first value since that's the version number
for (int i = 1; i < data.Length; i++)
{
data[i] = (char)(data[i] - 2);
}
int p = 0;
int version = ToInt(data[p++]);
if (version != SerializedVersion)
{
string reason = string.Format(CultureInfo.CurrentCulture, "Could not deserialize ATN with version {0} (expected {1})."
, version, SerializedVersion);
throw new NotSupportedException(reason);
}
Guid uuid = ToUUID(data, p);
p += 8;
if (!uuid.Equals(SerializedUuid))
{
string reason = string.Format(CultureInfo.CurrentCulture, "Could not deserialize ATN with UUID {0} (expected {1})."
, uuid, SerializedUuid);
throw new NotSupportedException(reason);
}
ATNType grammarType = (ATNType)ToInt(data[p++]);
int maxTokenType = ToInt(data[p++]);
ATN atn = new ATN(grammarType, maxTokenType);
//
// STATES
//
IList<Tuple<LoopEndState, int>> loopBackStateNumbers = new List<Tuple<LoopEndState
, int>>();
IList<Tuple<BlockStartState, int>> endStateNumbers = new List<Tuple<BlockStartState
, int>>();
int nstates = ToInt(data[p++]);
for (int i_1 = 0; i_1 < nstates; i_1++)
{
StateType stype = (StateType)ToInt(data[p++]);
// ignore bad type of states
if (stype == StateType.InvalidType)
{
atn.AddState(null);
continue;
}
int ruleIndex = ToInt(data[p++]);
if (ruleIndex == char.MaxValue)
{
ruleIndex = -1;
}
ATNState s = StateFactory(stype, ruleIndex);
if (stype == StateType.LoopEnd)
{
// special case
int loopBackStateNumber = ToInt(data[p++]);
loopBackStateNumbers.Add(Tuple.Create((LoopEndState)s, loopBackStateNumber));
}
else
{
if (s is BlockStartState)
{
int endStateNumber = ToInt(data[p++]);
endStateNumbers.Add(Tuple.Create((BlockStartState)s, endStateNumber));
}
}
atn.AddState(s);
}
// delay the assignment of loop back and end states until we know all the state instances have been initialized
foreach (Tuple<LoopEndState, int> pair in loopBackStateNumbers)
{
pair.Item1.loopBackState = atn.states[pair.Item2];
}
foreach (Tuple<BlockStartState, int> pair_1 in endStateNumbers)
{
pair_1.Item1.endState = (BlockEndState)atn.states[pair_1.Item2];
}
int numNonGreedyStates = ToInt(data[p++]);
for (int i_2 = 0; i_2 < numNonGreedyStates; i_2++)
{
int stateNumber = ToInt(data[p++]);
((DecisionState)atn.states[stateNumber]).nonGreedy = true;
}
int numSllDecisions = ToInt(data[p++]);
for (int i_3 = 0; i_3 < numSllDecisions; i_3++)
{
int stateNumber = ToInt(data[p++]);
((DecisionState)atn.states[stateNumber]).sll = true;
}
int numPrecedenceStates = ToInt(data[p++]);
for (int i_4 = 0; i_4 < numPrecedenceStates; i_4++)
{
int stateNumber = ToInt(data[p++]);
((RuleStartState)atn.states[stateNumber]).isPrecedenceRule = true;
}
//
// RULES
//
int nrules = ToInt(data[p++]);
if (atn.grammarType == ATNType.Lexer)
{
atn.ruleToTokenType = new int[nrules];
atn.ruleToActionIndex = new int[nrules];
}
atn.ruleToStartState = new RuleStartState[nrules];
for (int i_5 = 0; i_5 < nrules; i_5++)
{
int s = ToInt(data[p++]);
RuleStartState startState = (RuleStartState)atn.states[s];
startState.leftFactored = ToInt(data[p++]) != 0;
atn.ruleToStartState[i_5] = startState;
if (atn.grammarType == ATNType.Lexer)
{
int tokenType = ToInt(data[p++]);
if (tokenType == unchecked((int)(0xFFFF)))
{
tokenType = TokenConstants.Eof;
}
atn.ruleToTokenType[i_5] = tokenType;
int actionIndex = ToInt(data[p++]);
if (actionIndex == unchecked((int)(0xFFFF)))
{
actionIndex = -1;
}
atn.ruleToActionIndex[i_5] = actionIndex;
}
}
atn.ruleToStopState = new RuleStopState[nrules];
foreach (ATNState state in atn.states)
{
if (!(state is RuleStopState))
{
continue;
}
RuleStopState stopState = (RuleStopState)state;
atn.ruleToStopState[state.ruleIndex] = stopState;
atn.ruleToStartState[state.ruleIndex].stopState = stopState;
}
//
// MODES
//
int nmodes = ToInt(data[p++]);
for (int i_6 = 0; i_6 < nmodes; i_6++)
{
int s = ToInt(data[p++]);
atn.modeToStartState.Add((TokensStartState)atn.states[s]);
}
atn.modeToDFA = new DFA[nmodes];
for (int i_7 = 0; i_7 < nmodes; i_7++)
{
atn.modeToDFA[i_7] = new DFA(atn.modeToStartState[i_7]);
}
//
// SETS
//
IList<IntervalSet> sets = new List<IntervalSet>();
int nsets = ToInt(data[p++]);
for (int i_8 = 0; i_8 < nsets; i_8++)
{
int nintervals = ToInt(data[p]);
p++;
IntervalSet set = new IntervalSet();
sets.Add(set);
bool containsEof = ToInt(data[p++]) != 0;
if (containsEof)
{
set.Add(-1);
}
for (int j = 0; j < nintervals; j++)
{
set.Add(ToInt(data[p]), ToInt(data[p + 1]));
p += 2;
}
}
//
// EDGES
//
int nedges = ToInt(data[p++]);
for (int i_9 = 0; i_9 < nedges; i_9++)
{
int src = ToInt(data[p]);
int trg = ToInt(data[p + 1]);
TransitionType ttype = (TransitionType)ToInt(data[p + 2]);
int arg1 = ToInt(data[p + 3]);
int arg2 = ToInt(data[p + 4]);
int arg3 = ToInt(data[p + 5]);
Transition trans = EdgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);
// System.out.println("EDGE "+trans.getClass().getSimpleName()+" "+
// src+"->"+trg+
// " "+Transition.serializationNames[ttype]+
// " "+arg1+","+arg2+","+arg3);
ATNState srcState = atn.states[src];
srcState.AddTransition(trans);
p += 6;
}
// edges for rule stop states can be derived, so they aren't serialized
foreach (ATNState state_1 in atn.states)
{
bool returningToLeftFactored = state_1.ruleIndex >= 0 && atn.ruleToStartState[state_1
.ruleIndex].leftFactored;
for (int i_10 = 0; i_10 < state_1.NumberOfTransitions; i_10++)
{
Transition t = state_1.Transition(i_10);
if (!(t is RuleTransition))
{
continue;
}
RuleTransition ruleTransition = (RuleTransition)t;
bool returningFromLeftFactored = atn.ruleToStartState[ruleTransition.target.ruleIndex
].leftFactored;
if (!returningFromLeftFactored && returningToLeftFactored)
{
continue;
}
atn.ruleToStopState[ruleTransition.target.ruleIndex].AddTransition(new EpsilonTransition
(ruleTransition.followState));
}
}
foreach (ATNState state_2 in atn.states)
{
if (state_2 is BlockStartState)
{
// we need to know the end state to set its start state
if (((BlockStartState)state_2).endState == null)
{
throw new InvalidOperationException();
}
// block end states can only be associated to a single block start state
if (((BlockStartState)state_2).endState.startState != null)
{
throw new InvalidOperationException();
}
((BlockStartState)state_2).endState.startState = (BlockStartState)state_2;
}
if (state_2 is PlusLoopbackState)
{
PlusLoopbackState loopbackState = (PlusLoopbackState)state_2;
for (int i_10 = 0; i_10 < loopbackState.NumberOfTransitions; i_10++)
{
ATNState target = loopbackState.Transition(i_10).target;
if (target is PlusBlockStartState)
{
((PlusBlockStartState)target).loopBackState = loopbackState;
}
}
}
else
{
if (state_2 is StarLoopbackState)
{
StarLoopbackState loopbackState = (StarLoopbackState)state_2;
for (int i_10 = 0; i_10 < loopbackState.NumberOfTransitions; i_10++)
{
ATNState target = loopbackState.Transition(i_10).target;
if (target is StarLoopEntryState)
{
((StarLoopEntryState)target).loopBackState = loopbackState;
}
}
}
}
}
//
// DECISIONS
//
int ndecisions = ToInt(data[p++]);
for (int i_11 = 1; i_11 <= ndecisions; i_11++)
{
int s = ToInt(data[p++]);
DecisionState decState = (DecisionState)atn.states[s];
atn.decisionToState.Add(decState);
decState.decision = i_11 - 1;
}
atn.decisionToDFA = new DFA[ndecisions];
for (int i_12 = 0; i_12 < ndecisions; i_12++)
{
atn.decisionToDFA[i_12] = new DFA(atn.decisionToState[i_12], i_12);
}
if (optimize)
{
while (true)
{
int optimizationCount = 0;
optimizationCount += InlineSetRules(atn);
optimizationCount += CombineChainedEpsilons(atn);
bool preserveOrder = atn.grammarType == ATNType.Lexer;
optimizationCount += OptimizeSets(atn, preserveOrder);
if (optimizationCount == 0)
{
break;
}
}
}
IdentifyTailCalls(atn);
VerifyATN(atn);
return atn;
}
/// <summary>
/// Compute set of tokens that can follow
/// <paramref name="s"/>
/// in the ATN in the
/// specified
/// <paramref name="ctx"/>
/// .
/// <p/>
/// If
/// <paramref name="ctx"/>
/// is
/// <see cref="PredictionContext.EmptyLocal"/>
/// and
/// <paramref name="stopState"/>
/// or the end of the rule containing
/// <paramref name="s"/>
/// is reached,
/// <see cref="TokenConstants.EPSILON"/>
/// is added to the result set. If
/// <paramref name="ctx"/>
/// is not
/// <see cref="PredictionContext.EmptyLocal"/>
/// and
/// <paramref name="addEOF"/>
/// is
/// <see langword="true"/>
/// and
/// <paramref name="stopState"/>
/// or the end of the outermost rule is reached,
/// <see cref="TokenConstants.EOF"/>
/// is added to the result set.
/// </summary>
/// <param name="s">the ATN state.</param>
/// <param name="stopState">
/// the ATN state to stop at. This can be a
/// <see cref="BlockEndState"/>
/// to detect epsilon paths through a closure.
/// </param>
/// <param name="ctx">
/// The outer context, or
/// <see cref="PredictionContext.EmptyLocal"/>
/// if
/// the outer context should not be used.
/// </param>
/// <param name="look">The result lookahead set.</param>
/// <param name="lookBusy">
/// A set used for preventing epsilon closures in the ATN
/// from causing a stack overflow. Outside code should pass
/// <c>new HashSet<ATNConfig></c>
/// for this argument.
/// </param>
/// <param name="calledRuleStack">
/// A set used for preventing left recursion in the
/// ATN from causing a stack overflow. Outside code should pass
/// <c>new BitSet()</c>
/// for this argument.
/// </param>
/// <param name="seeThruPreds">
///
/// <see langword="true"/>
/// to true semantic predicates as
/// implicitly
/// <see langword="true"/>
/// and "see through them", otherwise
/// <see langword="false"/>
/// to treat semantic predicates as opaque and add
/// <see cref="HitPred"/>
/// to the
/// result if one is encountered.
/// </param>
/// <param name="addEOF">
/// Add
/// <see cref="TokenConstants.EOF"/>
/// to the result if the end of the
/// outermost context is reached. This parameter has no effect if
/// <paramref name="ctx"/>
/// is
/// <see cref="PredictionContext.EmptyLocal"/>
/// .
/// </param>
protected internal virtual void Look(ATNState s, ATNState stopState, PredictionContext ctx, IntervalSet look, HashSet<ATNConfig> lookBusy, BitSet calledRuleStack, bool seeThruPreds, bool addEOF)
{
// System.out.println("_LOOK("+s.stateNumber+", ctx="+ctx);
ATNConfig c = new ATNConfig(s, 0, ctx);
if (!lookBusy.Add(c))
{
return;
}
if (s == stopState)
{
if (ctx == null)
{
look.Add(TokenConstants.EPSILON);
return;
}
else if (ctx.IsEmpty && addEOF) {
look.Add(TokenConstants.EOF);
return;
}
}
if (s is RuleStopState)
{
if (ctx == null)
{
look.Add(TokenConstants.EPSILON);
return;
}
else if (ctx.IsEmpty && addEOF)
{
look.Add(TokenConstants.EOF);
return;
}
if (ctx != PredictionContext.EMPTY)
{
for (int i = 0; i < ctx.Size; i++)
{
ATNState returnState = atn.states[ctx.GetReturnState(i)];
bool removed = calledRuleStack.Get(returnState.ruleIndex);
try
{
calledRuleStack.Clear(returnState.ruleIndex);
Look(returnState, stopState, ctx.GetParent(i), look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
}
finally
{
if (removed)
{
calledRuleStack.Set(returnState.ruleIndex);
}
}
}
return;
}
}
int n = s.NumberOfTransitions;
for (int i_1 = 0; i_1 < n; i_1++)
{
Transition t = s.Transition(i_1);
if (t is RuleTransition)
{
RuleTransition ruleTransition = (RuleTransition)t;
if (calledRuleStack.Get(ruleTransition.ruleIndex))
{
continue;
}
PredictionContext newContext = SingletonPredictionContext.Create(ctx, ruleTransition.followState.stateNumber);
try
{
calledRuleStack.Set(ruleTransition.target.ruleIndex);
Look(t.target, stopState, newContext, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
}
finally
{
calledRuleStack.Clear(ruleTransition.target.ruleIndex);
}
}
else
{
if (t is AbstractPredicateTransition)
{
if (seeThruPreds)
{
Look(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
}
else
{
look.Add(HitPred);
}
}
else
{
if (t.IsEpsilon)
{
Look(t.target, stopState, ctx, look, lookBusy, calledRuleStack, seeThruPreds, addEOF);
}
else
{
if (t is WildcardTransition)
{
look.AddAll(IntervalSet.Of(TokenConstants.MinUserTokenType, atn.maxTokenType));
}
else
{
IntervalSet set = t.Label;
if (set != null)
{
if (t is NotSetTransition)
{
set = set.Complement(IntervalSet.Of(TokenConstants.MinUserTokenType, atn.maxTokenType));
}
look.AddAll(set);
}
}
}
}
}
}
}