/// <summary>Begin parsing at startRuleIndex</summary>
public virtual ParserRuleContext Parse(int startRuleIndex)
{
RuleStartState startRuleStartState = _atn.ruleToStartState[startRuleIndex];
InterpreterRuleContext rootContext = new InterpreterRuleContext(null, ATNState.InvalidStateNumber, startRuleIndex);
if (startRuleStartState.isPrecedenceRule)
{
EnterRecursionRule(rootContext, startRuleStartState.stateNumber, startRuleIndex, 0);
}
else
{
EnterRule(rootContext, startRuleStartState.stateNumber, startRuleIndex);
}
while (true)
{
ATNState p = AtnState;
switch (p.StateType)
{
case StateType.RuleStop:
{
// pop; return from rule
if (RuleContext.IsEmpty)
{
if (startRuleStartState.isPrecedenceRule)
{
ParserRuleContext result = RuleContext;
Tuple <ParserRuleContext, int> parentContext = _parentContextStack.Pop();
UnrollRecursionContexts(parentContext.Item1);
return(result);
}
else
{
ExitRule();
return(rootContext);
}
}
VisitRuleStopState(p);
break;
}
default:
{
try
{
VisitState(p);
}
catch (RecognitionException e)
{
State = _atn.ruleToStopState[p.ruleIndex].stateNumber;
Context.exception = e;
ErrorHandler.ReportError(this, e);
ErrorHandler.Recover(this, e);
}
break;
}
}
}
}
protected internal virtual void VisitState(ATNState p)
{
int edge;
if (p.NumberOfTransitions > 1)
{
ErrorHandler.Sync(this);
edge = Interpreter.AdaptivePredict(TokenStream, ((DecisionState)p).decision, RuleContext);
}
else
{
edge = 1;
}
Transition transition = p.Transition(edge - 1);
switch (transition.TransitionType)
{
case TransitionType.EPSILON:
{
if (pushRecursionContextStates.Get(p.stateNumber) && !(transition.target is LoopEndState))
{
InterpreterRuleContext ctx = new InterpreterRuleContext(_parentContextStack.Peek().Item1, _parentContextStack.Peek().Item2, RuleContext.RuleIndex);
PushNewRecursionContext(ctx, _atn.ruleToStartState[p.ruleIndex].stateNumber, RuleContext.RuleIndex);
}
break;
}
case TransitionType.ATOM:
{
Match(((AtomTransition)transition).token);
break;
}
case TransitionType.RANGE:
case TransitionType.SET:
case TransitionType.NOT_SET:
{
if (!transition.Matches(TokenStream.LA(1), TokenConstants.MinUserTokenType, 65535))
{
ErrorHandler.RecoverInline(this);
}
MatchWildcard();
break;
}
case TransitionType.WILDCARD:
{
MatchWildcard();
break;
}
case TransitionType.RULE:
{
RuleStartState ruleStartState = (RuleStartState)transition.target;
int ruleIndex = ruleStartState.ruleIndex;
InterpreterRuleContext ctx_1 = new InterpreterRuleContext(RuleContext, p.stateNumber, ruleIndex);
if (ruleStartState.isPrecedenceRule)
{
EnterRecursionRule(ctx_1, ruleStartState.stateNumber, ruleIndex, ((RuleTransition)transition).precedence);
}
else
{
EnterRule(ctx_1, transition.target.stateNumber, ruleIndex);
}
break;
}
case TransitionType.PREDICATE:
{
PredicateTransition predicateTransition = (PredicateTransition)transition;
if (!Sempred(RuleContext, predicateTransition.ruleIndex, predicateTransition.predIndex))
{
throw new FailedPredicateException(this);
}
break;
}
case TransitionType.ACTION:
{
ActionTransition actionTransition = (ActionTransition)transition;
Action(RuleContext, actionTransition.ruleIndex, actionTransition.actionIndex);
break;
}
case TransitionType.PRECEDENCE:
{
if (!Precpred(RuleContext, ((PrecedencePredicateTransition)transition).precedence))
{
throw new FailedPredicateException(this, string.Format("precpred(_ctx, {0})", ((PrecedencePredicateTransition)transition).precedence));
}
break;
}
default:
{
throw new NotSupportedException("Unrecognized ATN transition type.");
}
}
State = transition.target.stateNumber;
}
