internal void Complete()
{
if (_nodeStack.Count != 0)
{
StackNode data = (StackNode)_nodeStack.Pop();
throw ParserException.ParenNotMatch(data.charPushed);
}
_nodeStack = null;
// fix null
if (_root.Expression == null)
{
if (_root.OperandCount == 0)
{
_root = null;
}
else if (_root.OperandCount > 1)
{
throw ParserException.InternalError();
}
else
{
_root = (ExprNode)_root.Operands[0];
_root._parent = null;
}
}
}
internal void AddOperator(Operator expr)
{
_isStart = false;
ExprNode newNode = new ExprNode(expr);
ExprNode lastOperand = _top.LastOperand;
if (_top.Expression == null)
{
_top.Expression = expr;
}
else
{
Operator op = _top.Expression as Operator;
if (op == null)
{
throw ParserException.InternalError();
}
else
{
if (expr.Priority > op.Priority)
{
if (lastOperand != null)
{
_top.Remove(lastOperand);
newNode.Add(lastOperand);
_top.Add(newNode);
_top = newNode;
}
else
{
throw ParserException.InternalError();
}
}
else
{
if (_top.Parent != null)
{
newNode.Add(_root);
_root = newNode;
_top = newNode;
}
else
{
newNode.Add(_top);
_top = newNode;
_root = _top;
}
}
}
}
}