prql-lezer

A Lezer / CodeMirror grammar for PRQL. It's largely fully-functioning, with a few small TODOs in the grammar file.

CodeMirror grammars are required by some downstream tools, including Jupyter syntax highlighting. As of 2022-12 none yet use it.

We don't yet have the JS machinery around it, and it's not published to any package managers. We can add that shortly. Possibly it'll go into its own repo.

Developing

Given there aren't yet tests, we've been developing this by:

• Opening https://lezer-playground.vercel.app/
• Pasting an example query
• Pasting the current grammar
• Fixing any issues in the grammar
• Copying the grammar back into the repo

Instructions

Install dependencies:

npm install

Build:

npm run build

Test:

npm run test