Generating TextMate syntax highlighting grammars from Ohm grammars and semantics

[MetlinAlexander]

Hi!

I’m currently working on a bachelor thesis project based on Ohm.js, and I wanted to share a prototype tool I built.

The idea is to automatically generate TextMate syntax highlighting grammars (tmLanguage.json) from:

• an Ohm PEG grammar
• a small semantic classification layer

The project uses Ohm’s separation between grammar and semantics to infer syntax scopes and generate highlighting rules for editors like VSCode/TextMate.

Current features include:

• keyword extraction from PEG rules
• automatic scope generation
• support for comments/strings/numbers
• structural highlighting
• customizable semantic mapping

Repository:
https://github.com/MetlinAlexander/Peg2TextMate

Examples currently include:

• Lisp
• Pascal
• small DSL examples

The project is still experimental, but Ohm’s semantic model turned out to be a really interesting foundation for IDE tooling generation.

I’d be very interested in any feedback or suggestions from the Ohm community.

Thanks for creating and maintaining Ohm.js!