66 lines
1.9 KiB
Scheme
66 lines
1.9 KiB
Scheme
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;;; Little test harness, 'cause I'm paraoid about tricky code.
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;;; It's scsh specific -- Scheme 48 random-number stuff & the mail-notification
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;;; stuff.
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(define r (make-random 42))
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(define (rand n) (modulo (r) n))
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;;; For testing stable sort -- 3 & -3 compare the same.
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(define (my< x y) (< (abs x) (abs y)))
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(define (unstable-sort-test v) ; quick & heap vs simple insert
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(let ((v1 (vector-copy v))
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(v2 (vector-copy v))
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(v3 (vector-copy v))
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(v4 (vector-copy v)))
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(quick-sort! < v1)
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(quick-sort3! - v1)
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(heap-sort! < v2)
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(insert-sort! < v3)
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(and (or (not (equal? v1 v2))
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(not (equal? v1 v3))
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(not (equal? v1 v4))
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(not (vector-sorted? < v1)))
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(list v v1 v2 v3 v4))))
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(define (stable-sort-test v) ; insert, list & vector merge sorts
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(let ((v1 (vector-copy v))
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(v2 (vector-copy v))
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(v3 (list->vector (list-merge-sort! my< (vector->list v))))
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(v4 (list->vector (list-merge-sort my< (vector->list v)))))
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(vector-merge-sort! my< v1)
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(insert-sort! my< v2)
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(and (or (not (equal? v1 v2))
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(not (equal? v1 v3))
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(not (equal? v1 v4))
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(not (vector-sorted? my< v1)))
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(list v v1 v2 v3 v4))))
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(define (do-test max-size)
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(let lp ((i 0))
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(let ((i (cond ((= i 1000)
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(write-char #\.)
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(force-output)
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0)
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(else (+ i 1))))
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(v (random-vector (rand max-size))))
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(cond ((unstable-sort-test v) => (lambda (x) (cons 'u x)))
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((stable-sort-test v) => (lambda (x) (cons 's x)))
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(else (lp i))))))
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(define (test-n-mail max-size)
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(let ((losers (do-test max-size))
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(email-address "shivers@cc.gatech.edu"))
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(run (mail -s "sort lost" ,email-address) (<< ,losers))))
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(define (random-vector size)
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(let ((v (make-vector size)))
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(fill-vector-randomly! v (* 10 size))
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v))
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(define (fill-vector-randomly! v range)
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(let ((half (quotient range 2)))
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(do ((i (- (vector-length v) 1) (- i 1)))
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((< i 0))
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(vector-set! v i (- (rand range) half)))))
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