// Internal function for parsing property paths. last_index provides
// and index value for the last node name token, if supplied.
protected static PropertyNode FindNode(PropertyNode current, List <PathComponent> components,
int position, bool create)
{
// Run off the end of the list
if (current == null)
{
return(null);
}
// Success! This is the one we want.
else if (position >= components.Count)
{
return(current.GetAttribute(PropertyNode.Attribute.REMOVED) ? null : current);
}
// Empty component means root.
else if (components[position].name == "")
{
return(FindNode(current.GetRootNode(), components, position + 1, create));
}
// . means current directory
else if (components[position].name == ".")
{
return(FindNode(current, components, position + 1, create));
}
// .. means parent directory
else if (components[position].name == "..")
{
PropertyNode parent = current.GetParent();
if (parent == null)
{
throw new Exception("Attempt to move past root with '..'");
}
else
{
return(FindNode(parent, components, position + 1, create));
}
}
// Otherwise, a child name
else
{
PropertyNode child = current.GetChild(components[position].name,
components[position].index,
create);
return(FindNode(child, components, position + 1, create));
}
}
