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Improve the printer of SRFI-35 error conditions.

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* module/srfi/srfi-35.scm (print-condition): Print the name and value of
  each field.
This commit is contained in:
Ludovic Courtès 2009-11-10 22:15:21 +01:00
parent 99480e1118
commit 67231cef72
1 changed files with 16 additions and 3 deletions
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19
module/srfi/srfi-35.scm
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@ -100,9 +100,22 @@
(cons "pr" layout)))))
(define (print-condition c port)
(format port "#<condition ~a ~a>"
(condition-type-id (condition-type c))
(number->string (object-address c) 16)))
;; Print condition C to PORT in a way similar to how records print:
;; #<condition TYPE [FIELD: VALUE ...] ADDRESS>.
(define (field-values)
(let* ((type (struct-vtable c))
(strings (fold (lambda (field result)
(cons (format #f "~A: ~S" field
(condition-ref c field))
result))
'()
(condition-type-all-fields type))))
(string-join (reverse strings) " ")))
(format port "#<condition ~a [~a] ~a>"
(condition-type-id (condition-type c))
(field-values)
(number->string (object-address c) 16)))
(define (make-condition-type id parent field-names)
"Return a new condition type named ID, inheriting from PARENT, and with the