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(define caar (lambda (x) (car (car x))))
(define cadr (lambda (x) (car (cdr x))))
(define cadar (lambda (x) (cadr (car x))))
(define caddr (lambda (x) (cadr (cdr x))))
(define caddar (lambda (x) (caddr (car x))))
(define not (lambda (x) (if x False True)))
(define append (lambda (x y)
(if (null? x) y (cons (car x) (append (cdr x) y)))))
(define pair (lambda (x y) (cons x (cons y (q ()) ))))
(define pairlis
(lambda (x y)
(if (null? x)
(q ())
(cons (pair (car x) (car y)) (pairlis (cdr x) (cdr y))))))
(define assoc (lambda (x y)
(if (eq? (caar y) x) (cadar y) (assoc x (cdr y)))))
(define eval
(lambda (e a)
(cond
((atom? e) (assoc e a))
((atom? (car e))
(cond
((eq? (car e) (q car)) (car (eval (cadr e) a)))
((eq? (car e) (q cdr)) (cdr (eval (cadr e) a)))
((eq? (car e) (q cons)) (cons (eval (cadr e) a) (eval (caddr e) a)))
((eq? (car e) (q atom?)) (atom? (eval (cadr e) a)))
((eq? (car e) (q eq?)) (eq? (eval (cadr e) a) (eval (caddr e) a)))
((eq? (car e) (q quote)) (cadr e))
((eq? (car e) (q q)) (cadr e))
((eq? (car e) (q cond)) (evcon (cdr e) a))
(True (eval (cons (assoc (car e) a) (cdr e)) a))))
((eq? (caar e) (q lambda))
(eval (caddar e) (append (pairlis (cadar e) (evlis (cdr e) a)) a))))))
(define evcon
(lambda (c a)
(cond ((eval (caar c) a) (eval (cadar c) a))
(True (evcon (cdr c) a)))))
(define evlis
(lambda (m a)
(cond ((null? m) (q ()))
(True (cons (eval (car m) a) (evlis (cdr m) a))))))
(define assert-equal (lambda (x y) (= x y)))
(define assert-not-equal (lambda (x y) (not (assert-equal x y))))
(assert-equal (eval (q x) (q ((x test-value))))
(q test-value))
(assert-equal (eval (q y) (q ((y (1 2 3)))))
(q (1 2 3)))
(assert-not-equal (eval (q z) (q ((z ((1) 2 3)))))
(q (1 2 3)))
(assert-equal (eval (q (quote 7)) (q ()))
(q 7))
(assert-equal (eval (q (atom? (q (1 2)))) (q ()))
False)
(assert-equal (eval (q (eq? 1 1)) (q ((1 1))))
True)
(assert-equal (eval (q (eq? 1 2)) (q ((1 1) (2 2))))
False)
(assert-equal (eval (q (eq? 1 1)) (q ((1 1))))
True)
(assert-equal (eval (q (car (q (3 2)))) (q ()))
(q 3))
(assert-equal (eval (q (cdr (q (1 2 3)))) (q ()))
(q (2 3)))
(assert-not-equal (eval (q (cdr (q (1 (2 3) 4)))) (q ()))
(q (2 3 4)))
(assert-equal (eval (q (cons 1 (q (2 3)))) (q ((1 1)(2 2)(3 3))))
(q (1 2 3)))
(assert-equal (eval (q (cond ((atom? x) (q x-atomic))
((atom? y) (q y-atomic))
((q True) (q nonatomic))))
(q ((x 1)(y (3 4)))))
(q x-atomic))
(assert-equal (eval (q (cond ((atom? x) (q x-atomic))
((atom? y) (q y-atomic))
((q True) (q nonatomic))))
(q ((x (1 2))(y 3))))
(q y-atomic))
(assert-equal (eval (q (cond ((atom? x) (q x-atomic))
((atom? y) (q y-atomic))
((q True) (q nonatomic))))
(q ((x (1 2))(y (3 4)))))
(q nonatomic))
(assert-equal (eval (q ((lambda (x) (car (cdr x))) (q (1 2 3 4)))) (q ()))
2)
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