public static GraphNodePath From(IGraphNode root, [NotNull] MemberPath memberPath, out NodeIndex index)
{
if (memberPath == null)
{
throw new ArgumentNullException(nameof(memberPath));
}
var result = new GraphNodePath(root);
index = NodeIndex.Empty;
var memberPathItems = memberPath.Decompose();
for (int i = 0; i < memberPathItems.Count; i++)
{
var memberPathItem = memberPathItems[i];
bool lastItem = i == memberPathItems.Count - 1;
if (memberPathItem.MemberDescriptor != null)
{
result.PushMember(memberPathItem.MemberDescriptor.Name);
}
else if (memberPathItem.GetIndex() != null)
{
var localIndex = new NodeIndex(memberPathItem.GetIndex());
if (lastItem)
{
// If last item, we directly return the index rather than add it to the path
index = localIndex;
}
else
{
result.PushIndex(localIndex);
}
}
// Don't apply Target on last item
if (!lastItem)
{
// If this is a reference, add a target element to the path
var node = result.GetNode();
var objectReference = (node as IMemberNode)?.TargetReference;
if (objectReference?.TargetNode != null)
{
result.PushTarget();
}
}
}
return(result);
}
/// <summary>
/// Visits the <see cref="ObjectReference"/> contained in the given node, if any.
/// </summary>
/// <param name="node">The node being visited.</param>
protected virtual void VisitMemberTarget([NotNull] IMemberNode node)
{
if (node == null)
{
throw new ArgumentNullException(nameof(node));
}
if (node.TargetReference?.TargetNode != null)
{
if (ShouldVisitMemberTarget(node))
{
CurrentPath.PushTarget();
VisitReference(node, node.TargetReference);
CurrentPath.Pop();
}
}
}