tiddlylisp/eval.tl at master · mnielsen/tiddlylisp · GitHub

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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)