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(defun atom? (x)
(or (number? x)
(bool? x)
(string? x)
(nil? x)))
(defun product (xs)
(let ((p 1))
(dolist (x xs)
(set p (* p x)))
p))
(defun evil-r (expr env)
(let ((rec (lambda (e)
(evil-r e env))))
(cond ((atom? expr)
expr)
((symbol? expr)
(env expr))
((cons? expr)
(let ((op (car expr))
(args (cdr expr)))
(case op
('= (= (evil-r (car args) env)
(evil-r (cadr args) env)))
('+ (sum (map rec args)))
('- (- (evil-r (car args) env)
(sum (map rec (cdr args)))))
('* (product (map rec args)))
('/ (/ (evil-r (car args) env)
(product (map rec (cdr args)))))
('cons (cons (evil-r (car args) env)
(evil-r (cadr args) env)))
('car (car (evil-r (car args) env)))
('cdr (cdr (evil-r (car args) env)))
('quote (car args))
('if (if (evil-r (car args) env)
(evil-r (cadr args) env)
(and (cddr args)
(evil-r (caddr args) env))))
('progn (let ((res nil))
(dolist (arg args)
(set res (evil-r arg env)))
res))
('lambda (let ((x (caar args))
(body `(progn ,@(cdr args))))
(lambda (arg)
(evil-r body (lambda (sym)
(if (= sym x)
arg
(env sym)))))))
(_ ((evil-r op env)
(evil-r (car args) env))))))
(true (progn
(println "Undefined pattern: " expr)
(+ "1" 1))))))
(defun evil (expr)
(evil-r expr (lambda (x)
(println "Undefined variable: " x)
(+ "1" 1))))
(defun evil-examples ()
(println (evil '((lambda (x) (+ x 1330)) 7)))
(println (evil '((((lambda (x)
(lambda (y)
(lambda (z)
(+ (* x (* 2 y)) z))))
4) 5) 6)))
(println (evil '((lambda (f) (f 2))
(lambda (x) (+ 10 x)))))
(println (evil '((lambda (f)
((f f) 20))
(lambda (f)
(lambda (n)
(if (= n 0)
1
(* n ((f f) (- n 1)))))))))
(println (evil '((((lambda (f)
(f f))
(lambda (f)
(lambda (g)
(lambda (xs)
(if xs
(cons (g (car xs))
(((f f) g) (cdr xs))))))))
(lambda (x)
(* x 2)))
'(2 4 6 8 10 12))))
(println (evil '(((lambda (map)
(lambda (factorial)
((map factorial) '(1 2 3 4 5 6 7 8 9 10))))
((lambda (f)
(f f))
(lambda (f)
(lambda (g)
(lambda (xs)
(if xs
(cons (g (car xs))
(((f f) g) (cdr xs)))))))))
((lambda (f)
(f f))
(lambda (f)
(lambda (n)
(if (= n 0)
1
(* n ((f f) (- n 1)))))))))))
(defun do-factorial ()
(evil '(((lambda (map)
(lambda (factorial)
((map factorial) '(1 2 3 4 5 6 7 8 9 10))))
((lambda (f)
(f f))
(lambda (f)
(lambda (g)
(lambda (xs)
(if xs
(cons (g (car xs))
(((f f) g) (cdr xs)))))))))
((lambda (f)
(f f))
(lambda (f)
(lambda (n)
(if (= n 0)
1
(* n ((f f) (- n 1))))))))))
(defun do-factorial-d ()
(((lambda (map)
(lambda (factorial)
((map factorial) '(1 2 3 4 5 6 7 8 9 10))))
((lambda (f)
(f f))
(lambda (f)
(lambda (g)
(lambda (xs)
(if xs
(cons (g (car xs))
(((f f) g) (cdr xs)))))))))
((lambda (f)
(f f))
(lambda (f)
(lambda (n)
(if (= n 0)
1
(* n ((f f) (- n 1)))))))))