public override TerminalNode Val()
{
if (!this.IsConstant())
{
return(null);
}
TerminalNode result = factor.Val();
Tag op = unaryOp.Count > 0 ? unaryOp[0] : Tag.NULL;
if (op == Tag.DL_NOT)
{
if (unaryOp.Count % 2 != 0)
{
result = new BoolNode(!((result as BoolNode).value == 1));
}
}
else if (op == Tag.DL_MINUS || op == Tag.DL_PLUS)
{
op = Tag.DL_PLUS;
foreach (var item in unaryOp)
{
if (item == Tag.DL_MINUS)
{
op = op == Tag.DL_MINUS ? Tag.DL_PLUS : Tag.DL_MINUS;
}
}
if (op == Tag.DL_MINUS)
{
result = new IntNode(-(result as IntNode).value);
}
}
return(result);
}
public override TerminalNode Val()
{
if (!this.IsConstant())
{
return(null);
}
TerminalNode result = new BoolNode(false);
foreach (var node in children)
{
if (node.Op != Tag.NULL)
{
if (node.Op == Tag.DL_MULTI)
{
if (Utils.IsNumType(node.Type()))
{
result = new IntNode(((result as IntNode).value * (node.Val() as IntNode).value));
}
}
else if (node.Op == Tag.DL_OBELUS)
{
if (Utils.IsNumType(node.Type()))
{
result = new IntNode(((result as IntNode).value / (node.Val() as IntNode).value));
}
}
}
else
{
result = node.Val();
}
}
return(result);
}