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I experimented with an Ohm/CodeMirror bridge that would map an Ohm grammar to CodeMirror classes for marks and syntax highlighting.

It might be an interesting starting point for you: https://observablehq.com/@ajbouh/editor

The last time I needed a parser that supports lex/yacc experience, jison https://gerhobbelt.github.io/jison/docs/ worked fine for me.

I don’t find PEGs more useful or clear, tbh. Mostly because how precedence works.

I could swear I recently saw an article about a peg-tool that came with lsp support - sadly I can't find it. The closest I come is pest which has an ide-tools crate and some plugins for lsp/ide/editor support:

https://github.com/pest-parser

I have been on the lookout for something that code help me with Jinja files and it seems like a plausible candidate. Extra bonus points if I could actually embed the Python in the same grammar but at this point even having the code blocks segregated from the literal parts is a good start

https://pest.rs/?g=N4Ig5gTghgtjURALhAMwJYBsCmACAvLsLgMoDyAkr...