CraigStuntz / bidi

Checking Dependent Types with Normalization by Evaluation (Swift Version)

I'm translating David Christiansen's bidirectional typechecking Haskell example into Swift. Why would I do such a thing? It's not because Swift is especially well-suited to this task! I want to learn about type checking in dependently typed languages, and I want to learn more about Swift, so, well, why not?

This project is an incomplete work in progress.

David said

Please feel free to use or adapt [the examples] for your own purposes.

But he didn't specify a particular license. So I'm posting this version under the MIT license.

Running the code

Install dependencies

(You only need to do this once.)

If you don't already have the Swift command-line tools, install them via:

$ xcode-select --install

You will need swift-format. I installed this via Homebrew, as follows, but any method of installation should work so long as it ends up on your PATH

$ brew install swift-format

Run the tests

$ make test

...and, that's it! There is no executable for now, it's just library code.