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svn: r7982

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This commit is contained in:
Matthias Felleisen 2007-12-12 23:41:46 +00:00
parent 75b2415a96
commit cc4d5cfdc1
1 changed files with 71 additions and 64 deletions
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53
collects/htdp/error.ss
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@ -1,27 +1,34 @@
#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)
#lang mzscheme
;; (_ -> Boolean) (listof X) -> (union X false)
(define (find-non pred? l)
(require (lib "etc.ss")
(lib "list.ss"))
;; --------------------------------------------------------------------------
(provide check-arg check-arity check-proc check-result check-list-list
natural?
find-non tp-exn? number->ord)
(define (natural? w)
(and (number? w) (integer? w) (>= w 0)))
;; (_ -> 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 ------------------------------------------------------------------
#| 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-struct (tp-exn exn) ())
(define (tp-error name fmt . args)
(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)
(define (number->ord i)
(if (= i 0)
"zeroth"
(case (modulo i 10)
@ -30,13 +37,13 @@
[(2) (format "~and" i)]
[(3) (format "~ard" i)])))
;; Symbol (union true String) String X -> void
(define (check-list-list pname condition pred given)
;; 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 *-> X
(define (check-result pname pred? expected given . other-given)
;; Symbol (_ -> Boolean) String X X *-> X
(define (check-result pname pred? expected given . other-given)
(if (pred? given)
given
(tp-error pname "result of type <~a> expected, given: ~a" expected
@ -44,21 +51,21 @@
(car other-given)
given))))
;; check-arg : sym bool str str TST -> void
(define (check-arg pname condition expected arg-posn 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)
;; 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)
;; 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)
@ -71,4 +78,4 @@
(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)]))))))
[else (format "multiple arities (~s)" arity-of-f)])))))