A simple Lisp-like language supporting first-class functions and hygenic macros.

pip3 install -e . && nst tests/demo_readme.al

-- tests/demo_readme.al
-- (cd tests && nst demo_readme.al)
(include ./math.al) ; defines "len" and "empty?"

(let filter (lambda (fn ls)
    (if (empty? ls)
        'empty
        (if (fn (fst ls))
            (cons (fst ls) (filter fn (rst ls)))
            (filter fn (rst ls))))))

(defmacro asseq (a b) (assert (= a b))) ; Macro expansion happens at compile time

(asseq (len (filter (lambda (x) (< x 3)) '(1 2 3))) 2)

(let fib (lambda (n)
    (if (= n 0) 0
    (if (= n 1) 1
        (+ (fib (- n 1)) (fib (- n 2)))))))

(asseq (fib 10) 55)

Complete

• First-class functions
• Naive macros
• Basic imports

Mostly done

• Hygenic macros

To Do

• REPL improvements
• Module system
• Native functions
• And many more...

Aim: lower bytecode to LLVM or WASM.