//-----------------------------------------------
// QilVisitor overrides
//-----------------------------------------------
/// <summary>
/// Visit all children of "parent", replacing each child with a copy of each child.
/// </summary>
protected override QilNode Visit(QilNode oldNode)
{
QilNode?newNode = null;
if (oldNode == null)
{
return(null !);
}
// ShallowClone any nodes which have not yet been cloned
if (oldNode is QilReference)
{
// Reference nodes may have been cloned previously and put into scope
newNode = FindClonedReference(oldNode);
}
newNode ??= oldNode.ShallowClone(_fac);
return(base.Visit(newNode));
}
//-----------------------------------------------
// QilScopedVisitor methods
//-----------------------------------------------
/// <summary>
/// Push node and its shallow clone onto the substitution list.
/// </summary>
protected override void BeginScope(QilNode node)
{
_subs.AddSubstitutionPair(node, node.ShallowClone(_fac));
}