Is There An XSL Code Generator That Can Create XSLT By Example?

What you're asking is, essentially, "Given a set of input data and an output, is it possible to infer the logic of a program that will produce that output?" Except for the trivial case - where the program produces the provided output irrespective of the input - the answer is "No."

XSLTGen looks promising and exactly what you're looking for.

Update: (4-Apr-2015) Updated the link to the correct link as pointed to by: @user326608