Peg compile fails with pegjs 0.90

[pjmolina]

Hi John! First of all congrats for the hard work to do the the port! StringTemplate is one of my favourite pieces of software and I am delighted to see it ported to JS. I will happy to help with testing and occasional PRs.

I am testing it and fails for me at build time. Compiles with pegjs 0.80 but fails with pegjs v. 0.90. I have the following errors on the grammar:

cd compiler

pegjs --allowed-start-rules groupFile,templateFile,templateFileRaw,templateAndEOF stGrammar.pegjs
213:15: Expected "!", "$", "&", "(", ".", character class, comment, end of line, identifier, literal or whitespace but "{" found.

The problem appears not only here but in all other empty expressions for error handling.

grunt-peg 2.0.0 relies also on pegjs ~0.9.0

It looks like a grammar refactor is needed to support pegjs 0.9.0.