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;;; conditions.scm --- The R6RS conditions library
;; Copyright (C) 2010 Free Software Foundation, Inc.
;;
;; This library is free software; you can redistribute it and/or
;; modify it under the terms of the GNU Lesser General Public
;; License as published by the Free Software Foundation; either
;; version 3 of the License, or (at your option) any later version.
;;
;; This library 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
;; Lesser General Public License for more details.
;;
;; You should have received a copy of the GNU Lesser General Public
;; License along with this library; if not, write to the Free Software
;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
(library (rnrs conditions (6))
(export &condition
condition
simple-conditions
condition?
condition-predicate
condition-accessor
define-condition-type
&message
make-message-condition
message-condition?
condition-message
&warning
make-warning
warning?
&serious
make-serious-condition
serious-condition?
&error
make-error
error?
&violation
make-violation
violation?
&assertion
make-assertion-violation
assertion-violation?
&irritants
make-irritants-condition
irritants-condition?
condition-irritants
&who
make-who-condition
who-condition?
condition-who
&non-continuable
make-non-continuable-violation
non-continuable-violation?
&implementation-restriction
make-implementation-restriction-violation
implementation-restriction-violation?
&lexical
make-lexical-violation
lexical-violation?
&syntax
make-syntax-violation
syntax-violation?
syntax-violation-form
syntax-violation-subform
&undefined
make-undefined-violation
undefined-violation?)
(import (only (guile) and=> @@)
(rnrs base (6))
(rnrs lists (6))
(rnrs records procedural (6)))
(define &compound-condition (make-record-type-descriptor
'&compound-condition #f #f #f #f
'#((immutable components))))
(define compound-condition? (record-predicate &compound-condition))
(define make-compound-condition
(record-constructor (make-record-constructor-descriptor
&compound-condition #f #f)))
(define simple-conditions
(let ((compound-ref (record-accessor &compound-condition 0)))
(lambda (condition)
(cond ((compound-condition? condition)
(compound-ref condition))
((condition-internal? condition)
(list condition))
(else
(assertion-violation 'simple-conditions
"not a condition"
condition))))))
(define (condition? obj)
(or (compound-condition? obj) (condition-internal? obj)))
(define condition
(lambda conditions
(define (flatten cond)
(if (compound-condition? cond) (simple-conditions cond) (list cond)))
(or (for-all condition? conditions)
(assertion-violation 'condition "non-condition argument" conditions))
(if (or (null? conditions) (> (length conditions) 1))
(make-compound-condition (apply append (map flatten conditions)))
(car conditions))))
(define-syntax define-condition-type
(syntax-rules ()
((_ condition-type supertype constructor predicate
(field accessor) ...)
(letrec-syntax
((transform-fields
(syntax-rules ()
((_ (f a) . rest)
(cons '(immutable f a) (transform-fields . rest)))
((_) '())))
(generate-accessors
(syntax-rules ()
((_ counter (f a) . rest)
(begin (define a
(condition-accessor
condition-type
(record-accessor condition-type counter)))
(generate-accessors (+ counter 1) . rest)))
((_ counter) (begin)))))
(begin
(define condition-type
(make-record-type-descriptor
'condition-type supertype #f #f #f
(list->vector (transform-fields (field accessor) ...))))
(define constructor
(record-constructor
(make-record-constructor-descriptor condition-type #f #f)))
(define predicate (condition-predicate condition-type))
(generate-accessors 0 (field accessor) ...))))))
(define &condition (@@ (rnrs records procedural) &condition))
(define &condition-constructor-descriptor
(make-record-constructor-descriptor &condition #f #f))
(define condition-internal? (record-predicate &condition))
(define (condition-predicate rtd)
(let ((rtd-predicate (record-predicate rtd)))
(lambda (obj)
(cond ((compound-condition? obj)
(exists rtd-predicate (simple-conditions obj)))
((condition-internal? obj) (rtd-predicate obj))
(else #f)))))
(define (condition-accessor rtd proc)
(let ((rtd-predicate (record-predicate rtd)))
(lambda (obj)
(cond ((rtd-predicate obj) (proc obj))
((compound-condition? obj)
(and=> (find rtd-predicate (simple-conditions obj)) proc))
(else #f)))))
(define-condition-type &message &condition
make-message-condition message-condition?
(message condition-message))
(define-condition-type &warning &condition make-warning warning?)
(define &serious (@@ (rnrs records procedural) &serious))
(define make-serious-condition
(@@ (rnrs records procedural) make-serious-condition))
(define serious-condition? (condition-predicate &serious))
(define-condition-type &error &serious make-error error?)
(define &violation (@@ (rnrs records procedural) &violation))
(define make-violation (@@ (rnrs records procedural) make-violation))
(define violation? (condition-predicate &violation))
(define &assertion (@@ (rnrs records procedural) &assertion))
(define make-assertion-violation
(@@ (rnrs records procedural) make-assertion-violation))
(define assertion-violation? (condition-predicate &assertion))
(define-condition-type &irritants &condition
make-irritants-condition irritants-condition?
(irritants condition-irritants))
(define-condition-type &who &condition
make-who-condition who-condition?
(who condition-who))
(define-condition-type &non-continuable &violation
make-non-continuable-violation
non-continuable-violation?)
(define-condition-type &implementation-restriction
&violation
make-implementation-restriction-violation
implementation-restriction-violation?)
(define-condition-type &lexical &violation
make-lexical-violation lexical-violation?)
(define-condition-type &syntax &violation
make-syntax-violation syntax-violation?
(form syntax-violation-form)
(subform syntax-violation-subform))
(define-condition-type &undefined &violation
make-undefined-violation undefined-violation?)
)
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