private static bool TestTailCall(ATN atn, RuleTransition transition, bool optimizedPath)
{
if (!optimizedPath && transition.tailCall)
{
return true;
}
if (optimizedPath && transition.optimizedTailCall)
{
return true;
}
BitSet reachable = new BitSet(atn.states.Count);
Stack<ATNState> worklist = new Stack<ATNState>();
worklist.Push(transition.followState);
while (worklist.Count > 0)
{
ATNState state = worklist.Pop();
if (reachable.Get(state.stateNumber))
{
continue;
}
if (state is RuleStopState)
{
continue;
}
if (!state.OnlyHasEpsilonTransitions)
{
return false;
}
IList<Transition> transitions = optimizedPath ? state.optimizedTransitions : state.transitions;
foreach (Transition t in transitions)
{
if (t.TransitionType != TransitionType.EPSILON)
{
return false;
}
worklist.Push(t.target);
}
}
return true;
}
protected internal virtual Transition EdgeFactory(ATN atn, TransitionType type, int src, int trg, int arg1, int arg2, int arg3, IList<IntervalSet> sets)
{
ATNState target = atn.states[trg];
switch (type)
{
case TransitionType.EPSILON:
{
return new EpsilonTransition(target);
}
case TransitionType.RANGE:
{
if (arg3 != 0)
{
return new RangeTransition(target, TokenConstants.EOF, arg2);
}
else
{
return new RangeTransition(target, arg1, arg2);
}
}
case TransitionType.RULE:
{
RuleTransition rt = new RuleTransition((RuleStartState)atn.states[arg1], arg2, arg3, target);
return rt;
}
case TransitionType.PREDICATE:
{
PredicateTransition pt = new PredicateTransition(target, arg1, arg2, arg3 != 0);
return pt;
}
case TransitionType.PRECEDENCE:
{
return new PrecedencePredicateTransition(target, arg1);
}
case TransitionType.ATOM:
{
if (arg3 != 0)
{
return new AtomTransition(target, TokenConstants.EOF);
}
else
{
return new AtomTransition(target, arg1);
}
}
case TransitionType.ACTION:
{
ActionTransition a = new ActionTransition(target, arg1, arg2, arg3 != 0);
return a;
}
case TransitionType.SET:
{
return new SetTransition(target, sets[arg1]);
}
case TransitionType.NOT_SET:
{
return new NotSetTransition(target, sets[arg1]);
}
case TransitionType.WILDCARD:
{
return new WildcardTransition(target);
}
}
throw new ArgumentException("The specified transition type is not valid.");
}
protected ATNConfig RuleTransition(ATNConfig config, RuleTransition t)
{
if (debug)
{
Console.WriteLine("CALL rule " + GetRuleName(t.target.ruleIndex) +
", ctx=" + config.context);
}
ATNState returnState = t.followState;
PredictionContext newContext =
SingletonPredictionContext.Create(config.context, returnState.stateNumber);
return new ATNConfig(config, t.target, newContext);
}
protected internal virtual Transition EdgeFactory(ATN atn, TransitionType type, int src, int trg, int arg1, int arg2, int arg3, IList<IntervalSet> sets)
{
ATNState target = atn.states[trg];
switch (type)
{
case TransitionType.Epsilon:
{
return new EpsilonTransition(target);
}
case TransitionType.Range:
{
if (arg3 != 0)
{
return new RangeTransition(target, TokenConstants.Eof, arg2);
}
else
{
return new RangeTransition(target, arg1, arg2);
}
}
case TransitionType.Rule:
{
RuleTransition rt = new RuleTransition((RuleStartState)atn.states[arg1], arg2, arg3, target);
return rt;
}
case TransitionType.Predicate:
{
PredicateTransition pt = new PredicateTransition(target, arg1, arg2, arg3 != 0);
return pt;
}
case TransitionType.Precedence:
{
return new PrecedencePredicateTransition(target, arg1);
}
case TransitionType.Atom:
{
if (arg3 != 0)
{
return new AtomTransition(target, TokenConstants.Eof);
}
else
{
return new AtomTransition(target, arg1);
}
}
case TransitionType.Action:
{
ActionTransition a = new ActionTransition(target, arg1, arg2, arg3 != 0);
return a;
}
case TransitionType.Set:
{
return new SetTransition(target, sets[arg1]);
}
case TransitionType.NotSet:
{
return new NotSetTransition(target, sets[arg1]);
}
case TransitionType.Wildcard:
{
return new WildcardTransition(target);
}
}
throw new ArgumentException("The specified transition type is not valid.");
}
protected internal virtual void ReadEdges(ATN atn, IList <IntervalSet> sets)
{
//
// EDGES
//
int nedges = ReadInt();
for (int i_9 = 0; i_9 < nedges; i_9++)
{
int src = ReadInt();
int trg = ReadInt();
TransitionType ttype = (TransitionType)ReadInt();
int arg1 = ReadInt();
int arg2 = ReadInt();
int arg3 = ReadInt();
Transition trans = EdgeFactory(atn, ttype, src, trg, arg1, arg2, arg3, sets);
ATNState srcState = atn.states[src];
srcState.AddTransition(trans);
}
// edges for rule stop states can be derived, so they aren't serialized
foreach (ATNState state_1 in atn.states)
{
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;
int outermostPrecedenceReturn = -1;
if (atn.ruleToStartState[ruleTransition.target.ruleIndex].isPrecedenceRule)
{
if (ruleTransition.precedence == 0)
{
outermostPrecedenceReturn = ruleTransition.target.ruleIndex;
}
}
EpsilonTransition returnTransition = new EpsilonTransition(ruleTransition.followState, outermostPrecedenceReturn);
atn.ruleToStopState[ruleTransition.target.ruleIndex].AddTransition(returnTransition);
}
}
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;
}
else 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;
}
}
}
}
}
protected internal virtual Transition EdgeFactory(ATN atn, TransitionType type, int src, int trg, int arg1, int arg2, int arg3, IList <IntervalSet> sets)
{
ATNState target = atn.states[trg];
switch (type)
{
case TransitionType.EPSILON:
{
return(new EpsilonTransition(target));
}
case TransitionType.RANGE:
{
if (arg3 != 0)
{
return(new RangeTransition(target, TokenConstants.EOF, arg2));
}
else
{
return(new RangeTransition(target, arg1, arg2));
}
}
case TransitionType.RULE:
{
RuleTransition rt = new RuleTransition((RuleStartState)atn.states[arg1], arg2, arg3, target);
return(rt);
}
case TransitionType.PREDICATE:
{
PredicateTransition pt = new PredicateTransition(target, arg1, arg2, arg3 != 0);
return(pt);
}
case TransitionType.PRECEDENCE:
{
return(new PrecedencePredicateTransition(target, arg1));
}
case TransitionType.ATOM:
{
if (arg3 != 0)
{
return(new AtomTransition(target, TokenConstants.EOF));
}
else
{
return(new AtomTransition(target, arg1));
}
}
case TransitionType.ACTION:
{
ActionTransition a = new ActionTransition(target, arg1, arg2, arg3 != 0);
return(a);
}
case TransitionType.SET:
{
return(new SetTransition(target, sets[arg1]));
}
case TransitionType.NOT_SET:
{
return(new NotSetTransition(target, sets[arg1]));
}
case TransitionType.WILDCARD:
{
return(new WildcardTransition(target));
}
}
throw new ArgumentException("The specified transition type is not valid.");
}
/// <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);
}
}
}
}
}
}
}