public override void VisitLeave(Optional expression)
{
IsMatchPredicate local = _matchStack.Pop();
_matchStack.Push(
delegate(IInputIterator iterator)
{
Int32 savePosition = iterator.Index;
if (local(iterator))
{
savePosition = iterator.Index;
}
else
{
iterator.Index = savePosition;
}
return true;
}
);
}
public override void VisitEnter(Optional expression)
{
}
public override void VisitExecute(Optional expression)
{
}
public override void VisitLeave(Optional expression)
{
terminal.Peek().Append(")?");
}
public override void VisitEnter(Optional expression)
{
terminal.Peek().Append("(");
}
public abstract void VisitEnter(Optional expression);
public abstract void VisitLeave(Optional expression);
public abstract void VisitExecute(Optional expression);