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)
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.
loon is a lisp! https://github.com/ecto/loon
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
https://github.com/dunhamsteve/newt
Fluent – 4K lines – including parser, interpreter, standard library, IDE, UI, docs, examples. Will grow though.
https://github.com/mlajtos/fluent/blob/main/client.tsx
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
https://justine.lol/sectorlisp2/
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.