# Mini Go Lisp

Mini lisp interpreter written in Go. It is implemented with reference to the d-tsuji/SDLisp repository written in Java.

## Support

- System Functions
`car`

`cdr`

`cons`

`eq`

`if`

- arithmetic operations (
`+`

,`-`

,`*`

,`/`

) - comparative operation (
`>`

,`<`

,`>=`

,`<=`

,`=`

)

- Special
`symbol-function`

`quote`

or`'`

`setq`

`defun`

## Usage

```
$ go run github.com/d-tsuji/gosdlisp/cmd/gosdlisp
```

## Some examples

```
> (+ 1 2)
3
```

```
> (cons 1 '(2 3))
(1 2 3)
```

```
> (defun 1+ (n) (+ n 1))
1+
> (1+ 10)
11
```

```
> (defun abs (n) (if (< n 0) (- 0 n) n))
ABS
> (abs -1)
1
```

```
> (defun gcd (m n) (if (= (mod m n) 0) n (gcd n (mod m n))))
GCD
> (gcd 12 18)
6
```

```
> (defun fact (n) (if (< n 1) 1 (* n (fact (- n 1)))))
FACT
> (fact 10)
3628800
```

```
> (defun fib (n) (if (<= n 1) n (+ (fib (- n 1)) (fib (- n 2)))))
FIB
> (fib 11)
89
```

See eval_test.go for other examples of how it works.