Comment by sigjuice

I'd go further and say that it is redundant to even say 'source-to-source'. Just 'compiler' is enough, IMHO. See the first few pages of any compiler book.

https://books.google.com/books?id=_tgh4bgQ6PAC&printsec=fron...

Compilers are computer programs that translate a program written in one language into a program written in another language.