Hi,
I am trying to create a 'AET' (Abstract Expression Tree) for XPath (as I am writing a WYSIWYG XSL editor). I have been hitting my head against the wall with the XPath BNF for the past three to four hours.
I have thought of another solution. I thought I could write a class that implements IXPathNavigable, which returns a XPathNavigator of my own when CreateNavigator is called. This XPathNavigator would always succeed on any method calls, and would keep track of those calls - e.g. we moved to the customers node and then the customer node. I could then use this information (hopefully) to create the 'AET' (so we would have customers/customer in a object model now).
Only question is: how on earth do I run a IXPathNavigable through an XPathExpression?
I know this is excessively lazy. But has anyone else gone through the effort and written a XPath expression parser? I haven't yet POC'd my possible solution, because I can't test it (because I can't run the XPathExpression against a IXPathNavigable), so I don't even know if my solution will even work.