See this package on packagecontrol.io.
Syntax highlighting for the Waxeye parser generator
Waxeye is a parser generator based on parsing expression grammars (PEGs). It supports C, Java, JavaScript, Python, Racket, and Ruby. – Github
I briefly used Waxeye to learn more about PEGs but I found it hard to deal with the lack of colours in my editor. So I wrote a highlighter for it… and that’s when I lost interest in PEG grammars and I became interested in writing plugins for Sublime Text. 😄