I am working on a custom language plugin. First off I want to say that it is great that you have exposed such a rich feature set. Additionally the plugin development has been fairly straightforward so far.
My current problem is that I am trying to resolve a reference to another file in the tree. I'm able to make a ContentIterator and traverse the files (as VirtualFiles), but how do I obtain the PsIFileBase associated with that file so I can traverse the PSI? Or is there some other mechanism I should use to be able to get into the PSI for that file?