33 lines
1001 B
Racket
33 lines
1001 B
Racket
#lang racket/base
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(require racket/contract
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(for-syntax racket/base))
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;; network-error: symbol string . values -> void
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;; throws a formatted exn:fail:network
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(define (network-error src fmt . args)
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(raise (make-exn:fail:network (format "~a: ~a" src (apply format fmt args))
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(current-continuation-marks))))
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;; exn->string : (or/c exn any) -> string
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(define (exn->string exn)
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(if (exn? exn)
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(parameterize ([current-error-port (open-output-string)])
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((error-display-handler) (exn-message exn) exn)
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(get-output-string (current-error-port)))
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(format "~s\n" exn)))
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;; Eli: (or/c exn any)??
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(define-syntax (try stx)
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(syntax-case stx ()
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[(_ e) #'(#%expression e)]
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[(_ e0 e ...)
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(syntax/loc stx
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(with-handlers* ([exn:fail? (lambda (x) (try e ...))])
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(#%expression e0)))]))
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(provide try)
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(provide/contract
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[network-error (->* [symbol? string?] [] #:rest list? void?)]
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[exn->string (-> any/c string?)])
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