If you're interested in stuff like this, be sure to also check out Rascal:
The focus is slightly different: Rascal focuses more on automated code transformations and less on being a syntax highlighting service for editors. But Rascal is remarkably powerful and surprisingly accessible.
Basically, Rascal allows you to build Lispy macros in any language. Or to easily parse-and-transform new languages. Or to design entirely new languages and transpile them into something existing. To drive the point home, CoffeeScript, Nimrod and Sass could've easily been built with Rascal.