I would be more impressed if it were written in Swift, and not in Java.
I would be more impressed if it were called Taylor.
Disclosure: I am one of the developers of Tailor.
We would have loved to write Tailor in Swift, however (at the time of development) using the industry-standard ANTLR parser generator was the most feasible and straightforward way to develop a cross-platform tool without having to reverse-engineer the previously closed-source and proprietary SourceKit infrastructure.