sifun

Interpreter for SiFun (Simple Functional) Language with three different type systems (supports Higher Rank Polymorphism)
README

Interpreter for SiFun (Simple Functional) Language with three different type systems (supports Higher-Rank Polymorphism).

Currently supports Hindley–Milner type system (simply typed lambda calculus) and Hindley–Milner with Visible Type Application (similar to System F).

Under development is a Bidirectional Typechecking System which will support Higher-Rank Polymorphism without typed function and type application.

Installation

You can clone this repository using:

git clone git@github.com:kkd26/SiFun.git
cd SiFun
opam install .

or use the official opam release using:

opam install sifun

Usage

There are two ways to interact with the interpreter:

  1. SiFun REPL (Read–eval–print loop) - interactive console

    sifuni
    
  2. SiFun Interpreter - run from file

    sifun <filename>
    

SiFun Language syntax

The basic language supports (similar to Hindley–Milner type system):

  • integers 1, 2, 3, ...

  • booleans true, false

  • variables x, y, ...

  • pairs (1, true)

  • first and second fst (1,3), snd (4,5), ...

  • functions fn x => x, fn x => fn y => (x,y), ...

  • application (fn x => (1,x)) 2, ...

The additional features are (similar to System F):

  • typed functions fn x : int => x, ...

  • type variables a, b, c, ...

  • poly types forall a. a->a, forall a b c. a->b->c, ...

  • big lambda lam a. (int, fn x : a => x), lam a b c. fn x : a => x, ...

  • type application (lam a. fn x : a => x) {int}, ...

Note that ; separates blocks of code and ;; sends EOF, so stops execution.

You can check ./examples for more information about the syntax and semantics.

Install
Published
03 May 2022
Sources
3.0.0.tar.gz
md5=0314c1c1b0922e47ec33b040b16b87bb
sha512=357ded7e85079a24a45daf390bcead56ff5d4e62676759973452abb648cddcb684f3dfa48317c0a4233520981c81a0542b58250aeef84871c0381cb7514dc35b
Dependencies
bisect_ppx
with-test & >= "2.5.0"
ounit2
with-test
menhir
>= "20180523"
odoc
with-doc
dune
>= "2.9"
ocaml
>= "4.06"
Reverse Dependencies