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00f79aa4a0
accessors. * module/rnrs/conditions.scm (define-condition-type): The generated accessors should be condition accessors, which know how to unpack a compound condition; these can then delegate to the appropriate record accessors. * test-suite/tests/r6rs-conditions.test: New test case to verify above.
248 lines
8 KiB
Scheme
248 lines
8 KiB
Scheme
;;; conditions.scm --- The R6RS conditions library
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;; Copyright (C) 2010 Free Software Foundation, Inc.
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;;
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;; This library is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU Lesser General Public
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;; License as published by the Free Software Foundation; either
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;; version 3 of the License, or (at your option) any later version.
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;;
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;; This library is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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;; Lesser General Public License for more details.
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;;
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;; You should have received a copy of the GNU Lesser General Public
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;; License along with this library; if not, write to the Free Software
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;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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(library (rnrs conditions (6))
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(export &condition
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condition
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simple-conditions
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condition?
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condition-predicate
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condition-accessor
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define-condition-type
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&message
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make-message-condition
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message-condition?
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condition-message
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&warning
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make-warning
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warning?
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&serious
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make-serious-condition
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serious-condition?
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&error
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make-error
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error?
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&violation
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make-violation
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violation?
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&assertion
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make-assertion-violation
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assertion-violation?
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&irritants
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make-irritants-condition
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irritants-condition?
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condition-irritants
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&who
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make-who-condition
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who-condition?
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condition-who
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&non-continuable
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make-non-continuable-violation
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non-continuable-violation?
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&implementation-restriction
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make-implementation-restriction-violation
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implementation-restriction-violation?
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&lexical
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make-lexical-violation
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lexical-violation?
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&syntax
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make-syntax-violation
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syntax-violation?
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syntax-violation-form
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syntax-violation-subform
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&undefined
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make-undefined-violation
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undefined-violation?)
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(import (only (guile) and=> @@)
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(rnrs base (6))
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(rnrs lists (6))
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(rnrs records procedural (6)))
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(define &compound-condition (make-record-type-descriptor
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'&compound-condition #f #f #f #f
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'#((immutable components))))
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(define compound-condition? (record-predicate &compound-condition))
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(define make-compound-condition
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(record-constructor (make-record-constructor-descriptor
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&compound-condition #f #f)))
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(define simple-conditions (record-accessor &compound-condition 0))
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(define (condition? obj)
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(or (compound-condition? obj) (condition-internal? obj)))
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(define condition
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(lambda conditions
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(define (flatten cond)
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(if (compound-condition? cond) (simple-conditions cond) (list cond)))
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(or (for-all condition? conditions)
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(raise (make-assertion-violation)))
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(if (or (null? conditions) (> (length conditions) 1))
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(make-compound-condition (apply append (map flatten conditions)))
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(car conditions))))
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(define-syntax define-condition-type
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(syntax-rules ()
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((_ condition-type supertype constructor predicate
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(field accessor) ...)
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(letrec-syntax
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((transform-fields
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(syntax-rules ()
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((_ (f a) . rest)
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(cons '(immutable f a) (transform-fields rest)))
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((_ ((f a))) '((immutable f a)))
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((_ ()) '())
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((_) '())))
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(generate-accessors
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(syntax-rules ()
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((_ counter (f a) . rest)
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(begin (define a
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(condition-accessor
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condition-type
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(record-accessor condition-type counter)))
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(generate-accessors (+ counter 1) rest)))
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((_ counter ((f a)))
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(define a
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(condition-accessor
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condition-type (record-accessor condition-type counter))))
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((_ counter ()) (begin))
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((_ counter) (begin)))))
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(begin
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(define condition-type
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(make-record-type-descriptor
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'condition-type supertype #f #f #f
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(list->vector (transform-fields (field accessor) ...))))
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(define constructor
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(record-constructor
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(make-record-constructor-descriptor condition-type #f #f)))
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(define predicate (condition-predicate condition-type))
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(generate-accessors 0 (field accessor) ...))))))
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(define &condition (@@ (rnrs records procedural) &condition))
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(define &condition-constructor-descriptor
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(make-record-constructor-descriptor &condition #f #f))
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(define condition-internal? (record-predicate &condition))
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(define (condition-predicate rtd)
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(let ((rtd-predicate (record-predicate rtd)))
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(lambda (obj)
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(cond ((compound-condition? obj)
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(exists rtd-predicate (simple-conditions obj)))
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((condition-internal? obj) (rtd-predicate obj))
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(else #f)))))
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(define (condition-accessor rtd proc)
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(let ((rtd-predicate (record-predicate rtd)))
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(lambda (obj)
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(cond ((rtd-predicate obj) (proc obj))
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((compound-condition? obj)
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(and=> (find rtd-predicate (simple-conditions obj)) proc))
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(else #f)))))
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(define-condition-type &message &condition
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make-message-condition message-condition?
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(message condition-message))
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(define-condition-type &warning &condition make-warning warning?)
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(define &serious (@@ (rnrs records procedural) &serious))
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(define make-serious-condition
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(@@ (rnrs records procedural) make-serious-condition))
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(define serious-condition? (condition-predicate &serious))
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(define-condition-type &error &serious make-error error?)
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(define &violation (@@ (rnrs records procedural) &violation))
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(define make-violation (@@ (rnrs records procedural) make-violation))
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(define violation? (condition-predicate &violation))
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(define &assertion (@@ (rnrs records procedural) &assertion))
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(define make-assertion-violation
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(@@ (rnrs records procedural) make-assertion-violation))
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(define assertion-violation? (condition-predicate &assertion))
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(define-condition-type &irritants &condition
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make-irritants-condition irritants-condition?
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(irritants condition-irritants))
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(define-condition-type &who &condition
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make-who-condition who-condition?
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(who condition-who))
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(define-condition-type &non-continuable &violation
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make-non-continuable-violation
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non-continuable-violation?)
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(define-condition-type &implementation-restriction
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&violation
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make-implementation-restriction-violation
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implementation-restriction-violation?)
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(define-condition-type &lexical &violation
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make-lexical-violation lexical-violation?)
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(define-condition-type &syntax &violation
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make-syntax-violation syntax-violation?
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(form syntax-violation-form)
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(subform syntax-violation-subform))
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(define-condition-type &undefined &violation
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make-undefined-violation undefined-violation?)
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;; Condition types that are used by (rnrs files), (rnrs io ports), and
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;; (rnrs io simple). These are defined here so as to be easily shareable by
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;; these three libraries.
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(define-condition-type &i/o &error make-i/o-error i/o-error?)
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(define-condition-type &i/o-read &i/o make-i/o-read-error i/o-read-error?)
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(define-condition-type &i/o-write &i/o make-i/o-write-error i/o-write-error?)
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(define-condition-type &i/o-invalid-position
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&i/o make-i/o-invalid-position-error i/o-invalid-position-error?
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(position i/o-error-position))
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(define-condition-type &i/o-filename
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&i/o make-i/o-filename-error i/o-filename-error?
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(filename i/o-error-filename))
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(define-condition-type &i/o-file-protection
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&i/o-filename make-i/o-file-protection-error i/o-file-protection-error?)
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(define-condition-type &i/o-file-is-read-only
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&i/o-file-protection make-i/o-file-is-read-only-error
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i/o-file-is-read-only-error?)
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(define-condition-type &i/o-file-already-exists
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&i/o-filename make-i/o-file-already-exists-error
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i/o-file-already-exists-error?)
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(define-condition-type &i/o-file-does-not-exist
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&i/o-filename make-i/o-file-does-not-exist-error
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i/o-file-does-not-exist-error?)
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(define-condition-type &i/o-port &i/o make-i/o-port-error i/o-port-error?
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(port i/o-error-port))
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)
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