internal IokeObject Pop()
{
if (head != null)
{
while (Message.IsTerminator(head) && Message.GetNext(head) != null)
{
head = Message.GetNext(head);
Message.SetPrev(head, null);
}
}
IokeObject headToReturn = head;
head = chains.head;
last = chains.last;
chains = chains.parent;
return(headToReturn);
}
internal void Push(int precedence, IokeObject op, Level.Type type)
{
currentLevel = new Level(precedence, op, currentLevel, type);
chains = new BufferedChain(chains, last, head);
last = head = null;
}
internal BufferedChain(BufferedChain parent, IokeObject last, IokeObject head)
{
this.parent = parent;
this.last = last;
this.head = head;
}