;;;; more information.
(in-package "SB-GRAY")
+
+;;; BUG-OR-ERROR: because we have extensible streams, wherewith the
+;;; user is responsible for some of the protocol implementation, it's
+;;; not necessarily a bug in SBCL itself if we fall through to one of
+;;; these default methods.
+(defmacro bug-or-error (stream fun)
+ `(error "~@<The stream ~S has no suitable method for ~S, ~
+ and so has fallen through to this method. If you think that this is ~
+ a bug, please report it to the applicable authority (bugs in SBCL itself ~
+ should go to the mailing lists referenced from <http://www.sbcl.org/>).~@:>"
+ ,stream ,fun))
+
\f
(fmakunbound 'stream-element-type)
(defmethod stream-element-type ((stream fundamental-character-stream))
'character)
+
+(defmethod stream-element-type ((stream stream))
+ (bug-or-error stream 'stream-element-type))
+
+(defmethod stream-element-type ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
\f
(defgeneric pcl-open-stream-p (stream)
#+sb-doc
(defmethod pcl-open-stream-p ((stream fundamental-stream))
(stream-open-p stream))
+(defmethod pcl-open-stream-p ((stream stream))
+ (bug-or-error stream 'open-stream-p))
+
+(defmethod pcl-open-stream-p ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
+
;;; bootstrapping hack
(pcl-open-stream-p (make-string-output-stream))
(setf (fdefinition 'open-stream-p) #'pcl-open-stream-p)
(defgeneric input-stream-p (stream)
#+sb-doc
(:documentation "Can STREAM perform input operations?"))
-
+
(defmethod input-stream-p ((stream ansi-stream))
(ansi-stream-input-stream-p stream))
-
+
(defmethod input-stream-p ((stream fundamental-input-stream))
- t))
+ t)
+
+ (defmethod input-stream-p ((stream stream))
+ (bug-or-error stream 'input-stream-p))
+
+ (defmethod input-stream-p ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream)))
\f
(let ()
(fmakunbound 'output-stream-p)
(ansi-stream-output-stream-p stream))
(defmethod output-stream-p ((stream fundamental-output-stream))
- t))
+ t)
+
+ (defmethod output-stream-p ((stream stream))
+ (bug-or-error stream 'output-stream-p))
+
+ (defmethod output-stream-p ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream)))
\f
;;; character input streams
;;;