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;;; condition.scm -- Skribilo SRFI-35 error condition hierarchy.
;;;
;;; Copyright 2006 Ludovic Court�s <ludovic.courtes@laas.fr>
;;;
;;;
;;; This program is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU General Public License as published by
;;; the Free Software Foundation; either version 2 of the License, or
;;; (at your option) any later version.
;;;
;;; This program is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;;; GNU General Public License for more details.
;;;
;;; You should have received a copy of the GNU General Public License
;;; along with this program; if not, write to the Free Software
;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
;;; USA.
(define-module (skribilo condition)
:autoload (srfi srfi-1) (find)
:autoload (srfi srfi-34) (guard)
:use-module (srfi srfi-35)
:use-module (srfi srfi-39)
:autoload (skribilo utils syntax) (_ N_)
:export (&skribilo-error skribilo-error?
&invalid-argument-error invalid-argument-error?
&too-few-arguments-error too-few-arguments-error?
&file-error file-error?
&file-search-error file-search-error?
&file-open-error file-open-error?
&file-write-error file-write-error?
register-error-condition-handler!
lookup-error-condition-handler
%call-with-skribilo-error-catch
call-with-skribilo-error-catch))
;;; Author: Ludovic Court�s
;;;
;;; Commentary:
;;;
;;; Top-level of Skribilo's SRFI-35 error conditions.
;;;
;;; Code:
;;;
;;; Standard error conditions.
;;;
(define-condition-type &skribilo-error &error
skribilo-error?)
;;;
;;; Generic errors.
;;;
(define-condition-type &invalid-argument-error &skribilo-error
invalid-argument-error?
(proc-name invalid-argument-error:proc-name)
(argument invalid-argument-error:argument))
(define-condition-type &too-few-arguments-error &skribilo-error
too-few-arguments-error?
(proc-name too-few-arguments-error:proc-name)
(arguments too-few-arguments-error:arguments))
;;;
;;; File errors.
;;;
(define-condition-type &file-error &skribilo-error
file-error?
(file-name file-error:file-name))
(define-condition-type &file-search-error &file-error
file-search-error?
(path file-search-error:path))
(define-condition-type &file-open-error &file-error
file-open-error?)
(define-condition-type &file-write-error &file-error
file-write-error?)
;;;
;;; Adding new error conditions from other modules.
;;;
(define %external-error-condition-alist '())
(define (register-error-condition-handler! pred handler)
(set! %external-error-condition-alist
(cons (cons pred handler)
%external-error-condition-alist)))
(define (lookup-error-condition-handler c)
(let ((pair (find (lambda (pair)
(let ((pred (car pair)))
(pred c)))
%external-error-condition-alist)))
(if (pair? pair)
(cdr pair)
#f)))
;;;
;;; Convenience functions.
;;;
(define (%call-with-skribilo-error-catch thunk exit exit-val)
(guard (c ((invalid-argument-error? c)
(format (current-error-port)
(_ "in `~a': invalid argument: ~S~%")
(invalid-argument-error:proc-name c)
(invalid-argument-error:argument c))
(exit exit-val))
((too-few-arguments-error? c)
(format (current-error-port)
(_ "in `~a': too few arguments: ~S~%")
(too-few-arguments-error:proc-name c)
(too-few-arguments-error:arguments c)))
((file-search-error? c)
(format (current-error-port)
(_ "~a: not found in path `~S'~%")
(file-error:file-name c)
(file-search-error:path c))
(exit exit-val))
((file-open-error? c)
(format (current-error-port)
(_ "~a: cannot open file~%")
(file-error:file-name c))
(exit exit-val))
((file-write-error? c)
(format (current-error-port)
(_ "~a: cannot write to file~%")
(file-error:file-name c))
(exit exit-val))
((file-error? c)
(format (current-error-port)
(_ "file error: ~a~%")
(file-error:file-name c))
(exit exit-val))
(;;(skribilo-error? c)
#t ;; XXX: The SRFI-35 currently in `guile-lib' doesn't work
;; properly with non-direct super-types.
(let ((handler (lookup-error-condition-handler c)))
(if (procedure? handler)
(handler c)
(format (current-error-port)
(_ "undefined skribilo error: ~S~%")
c)))
(exit exit-val)))
(thunk)))
(define-macro (call-with-skribilo-error-catch thunk)
`(call/cc (lambda (cont)
(%call-with-skribilo-error-catch ,thunk cont #f))))
;;; arch-tag: 285010f9-06ea-4c39-82c2-6c3604f668b3
;;; conditions.scm ends here
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