FsmFragment IExprVisitor <FsmFragment> .VisitAlternative(AlternativesExpr alternativesExpr)
{
var from = _fsm.CreateState();
var to = _fsm.CreateState();
foreach (var elem in alternativesExpr.Items)
{
var fragment = elem.Apply(this);
_fsm.CreateTransition(from, fragment.From, FsmTransitionCondition.EmptyCondition);
_fsm.CreateTransition(fragment.To, to, FsmTransitionCondition.EmptyCondition);
}
return(new FsmFragment(from, to));
}
ParsingState IExprVisitor <ParsingState> .VisitAlternative(AlternativesExpr alternativesExpr)
{
int startPos = _currState.Pos;
ParsingState nextState;
if (_currState.InvocationCount < alternativesExpr.Items.Count && _currState.LastMatchSuccessed != true)
{
nextState = _currState.EnterChild(alternativesExpr.Items[_currState.InvocationCount]);
}
else
{
nextState = _currState.ExitChild(_currState.LastMatchSuccessed.Value, _currState.Pos - startPos);
}
return(nextState);
}
