Nashorn JS Grammar

[BURRIS Thomas]

I'm writing a DSL extension to Javascript and am trying to create Netbeans IDE support for it. To support syntax highlighting, etc, I need to parse the source scripts. Right now I'm doing it (as a PoC) using an old JavaCC grammar from 2006. This is insufficient since it's outdated, but also because it doesn't support the Nashorn extensions, which are crucial to my purpose. So ... my questions for the list are these:

* Is there a grammar that I can use (i.e., is open source) that supports the Nashorn extensions?
* If so, where can I get it? And what tool leverages it (i.e., Javacc, antlr, etc)?

Any other links / suggestions / prior art are welcome...

thanks!

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