72 lines
2.6 KiB
Scheme
72 lines
2.6 KiB
Scheme
#cs(module error mzscheme
|
|
(require (lib "etc.ss") (lib "list.ss"))
|
|
;; --------------------------------------------------------------------------
|
|
(provide check-arg check-arity check-proc check-result check-list-list find-non
|
|
tp-exn? number->ord)
|
|
|
|
;; (_ -> Boolean) (listof X) -> (union X false)
|
|
(define (find-non pred? l)
|
|
(let ([r (filter (compose not pred?) l)])
|
|
(if (null? r) #f (car r))))
|
|
|
|
#| Tests ------------------------------------------------------------------
|
|
(not (find-non list? '((1 2 3) (a b c))))
|
|
(symbol? (find-non number? '(1 2 3 a)))
|
|
(symbol? (find-non list? '((1 2 3) a (b c))))
|
|
|#
|
|
|
|
(define-struct (tp-exn exn) ())
|
|
|
|
(define (tp-error name fmt . args)
|
|
(raise (make-tp-exn (string-append (format "~a: " name) (apply format fmt args))
|
|
(current-continuation-marks))))
|
|
|
|
(define (number->ord i)
|
|
(if (= i 0)
|
|
"zeroth"
|
|
(case (modulo i 10)
|
|
[(0 4 5 6 7 8 9) (format "~ath" i)]
|
|
[(1) (format "~ast" i)]
|
|
[(2) (format "~and" i)]
|
|
[(3) (format "~ard" i)])))
|
|
|
|
;; Symbol (union true String) String X -> void
|
|
(define (check-list-list pname condition pred given)
|
|
(when (string? condition)
|
|
(tp-error pname (string-append condition (format "~nin ~e" given)))))
|
|
|
|
;; Symbol (_ -> Boolean) String X -> X
|
|
(define (check-result pname pred? expected given)
|
|
(if (pred? given)
|
|
given
|
|
(tp-error pname "result of type <~a> expected, given: ~e" expected given)))
|
|
|
|
;; check-arg : sym bool str str TST -> void
|
|
(define (check-arg pname condition expected arg-posn given)
|
|
(unless condition
|
|
(tp-error pname "expected <~a> as ~a argument, given: ~e"
|
|
expected arg-posn given)))
|
|
|
|
;; check-arity : sym num (list-of TST) -> void
|
|
(define (check-arity name arg# args)
|
|
(if (= (length args) arg#)
|
|
(void)
|
|
(tp-error name "expects ~a arguments, given ~e" arg# (length args))))
|
|
|
|
;; check-proc :
|
|
;; sym (... *->* ...) num (union sym str) (union sym str) -> void
|
|
(define (check-proc proc f exp-arity arg# arg-err)
|
|
(unless (procedure? f)
|
|
(tp-error proc "procedure expected as ~s argument; given ~e" arg# f))
|
|
(unless (procedure-arity-includes? f exp-arity)
|
|
(let ([arity-of-f (procedure-arity f)])
|
|
(tp-error proc "procedure of ~a expected as ~a argument; given procedure of ~a "
|
|
arg-err arg#
|
|
(cond
|
|
[(number? arity-of-f)
|
|
(if (= arity-of-f 1)
|
|
(format "1 argument")
|
|
(format "~s arguments" arity-of-f))]
|
|
[(arity-at-least? arity-of-f) (format "at least ~s arguments" (arity-at-least-value arity-of-f))]
|
|
[else (format "multiple arities (~s)" arity-of-f)]))))))
|