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call-cc.scm
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(load "prereqs.scm")
(display "An interpreter for a language with call/cc")
(newline)
(define c+
(lambda (v)
(lambda (k)
(k (lambda (w)
(lambda (k)
(k (+ v w))))))))
(define c*
(lambda (v)
(lambda (k)
(k (lambda (w)
(lambda (k)
(k (* v w))))))))
(define cadd1
(lambda (v)
(lambda (k)
(k (add1 v)))))
(define csub1
(lambda (v)
(lambda (k)
(k (sub1 v)))))
(define init-env
(lambda (y)
(if ((ceq? 'Y-cps) y) Y-cps
(if ((ceq? '*) y) c*
(if ((ceq? '+) y) c+
(if ((ceq? 'add1) y) cadd1
(if ((ceq? 'sub1) y) csub1
error)))))))
(define empty-k (lambda (v) v))
(define call/cc-fun
(lambda (k)
(lambda (a)
(lambda (k^)
(k a)))))
(define value-of
(lambda (exp)
(lambda (env)
(pmatch exp
(,exp (guard (number? exp)) (lambda (k) (k exp)))
(,exp (guard (symbol? exp)) (lambda (k) (k (env exp))))
((lambda (,x) ,body)
(let ((sbody (value-of body)))
(let ((sfun (lambda (a)
(sbody
(lambda (y)
(if ((ceq? x) y) a (env y)))))))
(lambda (k) (k sfun)))))
((call/cc ,rator)
(let ((srator ((value-of rator) env)))
(lambda (k)
(((value-of rator) env)
(lambda (p) ((p (lambda (a)
(lambda (k^)
(k a)))) k))))))
((,rator ,rand)
(let ((srator ((value-of rator) env)))
(let ((srand ((value-of rand) env)))
(lambda (k)
(srator (lambda (p)
(srand (lambda (a)
((p a) k)))))))))))))
(define eval-exp
(lambda (t)
(((value-of t) init-env) empty-k)))
;;;;;;;;;;;;;;;;; Test Suite
(test-check "lambda-calc"
(eval-exp '((lambda (x) ((lambda (y) x) 6)) 5))
5)
(test-check "worse lambda calc"
(eval-exp '(((lambda (x) (lambda (y) x)) 5) 6))
5)
(test-check "test1"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (add1 (k (add1 (k 1)))))))))
3)
(test-check "test2"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (add1 (k 1)))))))
3)
(test-check "test3"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (k (k (k (k (k (k 1)))))))))))
3)
(test-check "test4"
(eval-exp '(add1 ((+ 5) (call/cc (lambda (k) (k (k (k (k (k (k 1)))))))))))
7)
(test-check "s&r"
(eval-exp '((+ (call/cc (lambda (k) ((+ 10) (k 100))))) (call/cc (lambda (k^) 1))))
101)
(test-check "working test1"
(eval-exp '((+ (call/cc (lambda (k) ((+ 10) (k 100))))) (call/cc (lambda (k^) 1))))
101)
(test-check "working-test2"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (k (add1 (k (k 5)))))))))
7)
(test-check "working test3"
(eval-exp '(add1 (call/cc (lambda (k) (k 5)))))
6)
(test-check "other s&r"
(eval-exp '(add1 ((+ (call/cc (lambda (k) ((+ 10) (k 100))))) (call/cc (lambda (k^) (add1 1))))))
103)
(test-check "nested resets1"
(eval-exp '(add1 (call/cc (lambda (k) (add1 (call/cc (lambda (k2) (k 5))))))))
6)
(test-check "nested resets3"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (add1 (call/cc (lambda (k2) (k 5)))))))))
7)
(test-check "nested resets4"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (add1 (call/cc (lambda (k2) (k2 (k 5))))))))))
7)
(test-check "nested resets5"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (add1 (call/cc (lambda (k2) (k (k2 5))))))))))
8)
(test-check "nested resets6"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (k (add1 (call/cc (lambda (k2) (k2 5))))))))))
8)
(test-check "nested resets7"
(eval-exp '(add1 (add1 (call/cc (lambda (k) (k (add1 (call/cc (lambda (k2) (k2 (k2 5)))))))))))
8)
(test-check "plus and times"
(eval-exp '((* 10) ((* 20) (call/cc (lambda (k) ((+ 5) (k ((+ 2) 3))))))))
1000)