+ ;; KLUDGE: It seemed to me initially that there ought to be a way
+ ;; of collecting all the erroneous problems in one go, rather than
+ ;; this way of solving the problem of signalling the errors that
+ ;; we are required to, which stops at the first bogus input.
+ ;; However, after playing around a little, I couldn't find that
+ ;; way, so I've left it as is, but if someone does come up with a
+ ;; better way... -- CSR, 2002-09-08
+ (do ((direct-slots (getf initargs :direct-slots) (cdr direct-slots)))
+ ((endp direct-slots) nil)
+ (destructuring-bind (slot &rest more) direct-slots
+ (let ((slot-name (getf slot :name)))
+ (when (some (lambda (s) (eq slot-name (getf s :name))) more)
+ ;; FIXME: It's quite possible that we ought to define an
+ ;; SB-INT:PROGRAM-ERROR function to signal these and other
+ ;; errors throughout the codebase that are required to be
+ ;; of type PROGRAM-ERROR.
+ (error 'simple-program-error
+ :format-control "~@<There is more than one direct slot ~
+ with name ~S.~:>"
+ :format-arguments (list slot-name)))
+ (do ((stuff slot (cddr stuff)))
+ ((endp stuff) nil)
+ (destructuring-bind (option value &rest more) stuff
+ (cond
+ ((and (member option '(:allocation :type
+ :initform :documentation))
+ (not (eq unsupplied
+ (getf more option unsupplied))))
+ (error 'simple-program-error
+ :format-control "~@<Duplicate slot option ~S for ~
+ slot named ~S.~:>"
+ :format-arguments (list option slot-name)))
+ ((and (eq option :readers)
+ (notevery #'symbolp value))
+ (error 'simple-program-error
+ :format-control "~@<Slot reader names for slot ~
+ named ~S must be symbols.~:>"
+ :format-arguments (list slot-name)))
+ ((and (eq option :initargs)
+ (notevery #'symbolp value))
+ (error 'simple-program-error
+ :format-control "~@<Slot initarg names for slot ~
+ named ~S must be symbols.~:>"
+ :format-arguments (list slot-name)))))))))
+ (loop for (initarg . more) on (getf initargs :direct-default-initargs)
+ for name = (car initarg)
+ when (some (lambda (a) (eq (car a) name)) more)
+ do (error 'simple-program-error
+ :format-control "~@<Duplicate initialization argument ~
+ name ~S in :DEFAULT-INITARGS.~:>"
+ :format-arguments (list name class)))
+ (let ((metaclass 0)
+ (default-initargs 0))
+ (do ((args initargs (cddr args)))
+ ((endp args) nil)
+ (case (car args)
+ (:metaclass
+ (when (> (incf metaclass) 1)
+ (error 'simple-program-error
+ :format-control "~@<More than one :METACLASS ~
+ option specified.~:>")))
+ (:direct-default-initargs
+ (when (> (incf default-initargs) 1)
+ (error 'simple-program-error
+ :format-control "~@<More than one :DEFAULT-INITARGS ~
+ option specified.~:>"))))))
+ (remf initargs :metaclass)
+ (loop (unless (remf initargs :direct-superclasses) (return)))
+ (loop (unless (remf initargs :direct-slots) (return)))
+ (values
+ meta
+ (nconc
+ (when (neq supplied-supers unsupplied)
+ (list :direct-superclasses (mapcar #'fix-super supplied-supers)))
+ (when (neq supplied-slots unsupplied)
+ (list :direct-slots supplied-slots))
+ initargs))))