PEG in Go

I've been working on a PEG parser in Go. PEG parsers are very similar to traditional CFG parsers but unambiguous and (generally) easier to write.

The library can be found here. I put together a basic example which parses simple mathematical expressions and evaluates them. It's crude but it does work:

There are two things I'd like to get working next:

1. Add a .compile method which will let you parse PEG syntax instead of having to specify all the rules as Go calls
2. Come up with a way to make processing expression trees easier

But I may not get to all that.