lang-clojure-eval

A Codemirror 6 language extension based on the Lezer Clojure parser, with inline-evaluation support via the Small Clojure Interpreter (SCI).

API Reference

clojure() → LanguageSupport

Clojure language support including evaluation.

clojureLanguage: LRLanguage

A language provider based on the Lezer Clojure parser, extended with highlighting and indentation information.

evalExtension: Extension

Inline-evaluation support via the Small Clojure Interpreter

Java interop

Since many commonly used Java methods are not accessible because we are in a JavaScript environment, a limited subset have been ported into Clojure for compatibility. If you'd like to use one that has not been ported, please file an issue and we'll see what we can do.

Status

Alpha. Certainly contains bugs. There is a live demo running which is continuously built from the main branch.

• ✅ Implement Lezer parser
• ✅ Hook up Clojure interpreter
• ✅ Eval-cell
• ✅ Eval-at-cursor
• ✅ Eval top-level form
• ✅ Display results inline
• ✅ Implement clear-events
• ✅ Publish to npm
• ✅ Create test suite
• ✅ Test published package
• ✅ Handle errors
• ✅ Pretty-print eval result
• ✅ Truncate very long eval result
• ✅ Handle infinite loops

Run demo locally

npm install
npm run dev

Dev

To compile sci.js from the Clojurescript source:

npx shadow-cljs release sci

Credits

• The lang-clojure extension provides the Lezer parser, highlighting and formatting information.
• Evaluation functionality ported from Nextjournal's clojure-mode.
• SCI compiled to ESM with shadow-cljs.
• 4ever-clojure for the nice stacktraces