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; string search -- brute force method (define-syntax assert (syntax-rules () ((assert expr result) (if (not (equal? expr result)) (for-each display `( #\newline "failed assertion:" #\newline expr #\newline "expected: " ,result #\newline "returned: " ,expr #\newline)))))) (define (bf-search pat str . s) (let ((plen (string-length pat)) (slen (string-length str))) (let loop ((p 0) (s (if (null? s) 0 (car s)))) (cond ((= p plen) (- s plen)) ((= s slen) #f) ((char=? (string-ref pat p) (string-ref str s)) (loop (+ p 1) (+ s 1))) (else (loop 0 (- s p -1))))))) (define (test-search search) (assert (search "Programming Praxis" "Programming Praxis") 0) (assert (search "Praxis" "Programming Praxis") 12) (assert (search "Prax" "Programming Praxis") 12) (assert (search "praxis" "Programming Praxis") #f) (assert (search "P" "Programming Praxis") 0) (assert (search "P" "Programming Praxis" 5) 12) ) (test-search bf-search)
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