- loon is a lisp! https://github.com/ecto/loon
[type Shape [Circle Float] [Rect Float Float]] [fn area [s] [match s [Circle r] => [* 3.14 r r] [Rect w h] => [* w h]]] [area [Circle 5.0]]- idk how I haven't crossed a lisp with square brackets but dang I am sorta stunned at how I've never even envisioned it? thanks
- My little language Newt is 7 kloc. Dunno if it's worth including, it's mostly an exercise to learn how these things work and is not as polished as I'd like.
- Self-hosted
- Compiles to javascript
- Bidirectional typechecking with NbE (based on elaboration zoo)
- Dependent type checking
- type classes
- ADTs with dependent pattern matching
- TCO (trampoline for mutually tail recursive functions)
- Erasure of compile-time only values (0, ω quantities, but not linear)
- Web playground
- LSP (added this month)
- Syntax is similar to Agda / Idris / Haskell
- Fluent – 4K lines – including parser, interpreter, standard library, IDE, UI, docs, examples. Will grow though.
- I'll add it! Thanks.
EDIT: Actually, it's not quite "ML-family" enough for this post. But it is a remarkably cool project! :)
- If you're accepting additions here is a fun one some friends and I did as experiment at the Topos Institute: https://github.com/ToposInstitute/polytt
And here is a set of single file lambda calculus implementations with a variety of extensions: https://github.com/solomon-b/lambda-calculus-hs
`polytt` is kind of an ended experiment but that lambda calculus repo i plan to extend in the near future.
- Another crazy one is SectorLISP, 223 lines of asm
- The hardest part with small languages isn't the parser, it's the standard library and error messages. Getting a helpful IDE experience in that footprint is a significant engineering challenge.
