syntax-color/lexer-contract: make random-test failure declare itself
Random tests that are implciitly injected into a program should declare themselves as such when they fail. Otherwise, random crashes are really confusing.
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@ -33,32 +33,47 @@
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(define-values (txt type paren start end) (lexer in))
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(values txt type paren start end 0 #f))]
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[else lexer]))
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(for ([x (in-range 10)])
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(define size (random 100))
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(define (quash-backslash-r c)
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;; it isn't clear the spec is right in
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;; the case of \r\n combinations, so we
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;; punt for now
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(if (equal? c #\return) #\newline c))
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(define s (build-string
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size
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(λ (c)
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(quash-backslash-r
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(case (random 3)
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[(0)
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(define s " ()@{}\"λΣ\0")
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(string-ref s (random (string-length s)))]
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[(1 2)
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(integer->char (random 255))])))))
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(define in (open-input-string s))
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(port-count-lines! in)
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(let loop ([mode #f][offset 0])
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(define-values (txt type paren start end backup new-mode)
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(3ary-lexer in offset mode))
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(cond
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[(equal? type 'eof) #t]
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[(< end size) (loop new-mode end)]
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[else #f]))))
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(define initial-state (pseudo-random-generator->vector
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(current-pseudo-random-generator)))
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(with-handlers ([exn:fail?
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(lambda (exn)
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(raise
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(make-exn
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(format (string-append "try-some-random-streams:"
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" random testing of lexer failed\n"
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" lexer: ~e\n"
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" pseudo-random state: ~s\n"
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" error message: ~s")
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lexer
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initial-state
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(exn-message exn))
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(exn-continuation-marks exn))))])
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(for ([x (in-range 10)])
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(define size (random 100))
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(define (quash-backslash-r c)
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;; it isn't clear the spec is right in
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;; the case of \r\n combinations, so we
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;; punt for now
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(if (equal? c #\return) #\newline c))
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(define s (build-string
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size
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(λ (c)
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(quash-backslash-r
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(case (random 3)
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[(0)
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(define s " ()@{}\"λΣ\0")
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(string-ref s (random (string-length s)))]
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[(1 2)
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(integer->char (random 255))])))))
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(define in (open-input-string s))
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(port-count-lines! in)
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(let loop ([mode #f][offset 0])
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(define-values (txt type paren start end backup new-mode)
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(3ary-lexer in offset mode))
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(cond
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[(equal? type 'eof) #t]
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[(< end size) (loop new-mode end)]
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[else #f])))))
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(define (end/c start type)
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(cond
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