fix(jruby): make less-naive inference of xpath custom function ns #2148
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What problem is this PR intended to solve?
Closes #1890
Related to #2147
JRuby's logic for inferring a namespace for the custom XPath function handler has been naive since it was introduced in 468c757. This PR makes it less naive and less likely to break things by looking for function calls in the query via regex, and looking for matches among the handler's declared Ruby methods.
Ideally we should require namespaces in both JRuby and CRuby implementations at some point to avoid having to do this kind of heavy lifting. See #2147 for a proposal.
Have you included adequate test coverage?
Sure.
Does this change affect the behavior of either the C or the Java implementations?
Only changes the JRuby implementation, to do a better job of matching the CRuby behavior.