public override void Visit(AndNode node)
{
if (!(node.Parent is L1Expression))
{
throw new NotSupportedException(String.Format(
"Not a CNF or fatal error: '{0}", node.Parent));
}
}
protected override IAstTreeNode Xform(OrNode node)
{
foreach(var child in node.Children)
{
if (child is AndNode)
{
var restOfDisjunction = (IAstTreeNode)node.Clone();
restOfDisjunction.Children.RemoveAll(cchild => cchild.Id == child.Id);
var result = new AndNode();
foreach(var conjunct in child.Children.Snapshot())
{
var disjunction = new OrNode();
disjunction.Children.Add(conjunct);
disjunction.Children.AddRange(restOfDisjunction.Children);
result.Children.Add(disjunction);
}
return result;
}
}
return null;
}
public virtual void Visit(AndNode node){}
protected virtual IAstTreeNode Xform(AndNode node) { return null; }
public sealed override void Visit(AndNode node) { VisitAndXform(node, Xform(node)); }