;;; 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.
+;;;
+;;; FIXME: there's a lot of similarity in these Gray stream
+;;; implementation generic functions. All of them could (maybe
+;;; should?) have two default methods: one on STREAM calling
+;;; BUG-OR-ERROR, and one on T signalling a TYPE-ERROR.
(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))
-
+ `(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)
(setf (stream-open-p stream) nil)
t)
-(setf (fdefinition 'close) #'pcl-close)
+(progn
+ ;; KLUDGE: Get in a call to PCL-CLOSE with a string-output-stream before
+ ;; setting it as CLOSE. Otherwise using NAMED-LAMBDAs as DFUNs causes a
+ ;; vicious metacircle from FORMAT NIL somewhere in the compiler. This is
+ ;; enough to get the dispatch settled down before we need it.
+ (pcl-close (make-string-output-stream))
+ (setf (fdefinition 'close) #'pcl-close))
\f
(let ()
(fmakunbound 'input-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-stream))
+ nil)
+
(defmethod input-stream-p ((stream fundamental-input-stream))
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 'interactive-stream-p)
+
+ (defgeneric interactive-stream-p (stream)
+ #+sb-doc
+ (:documentation "Is STREAM an interactive stream?"))
+
+ (defmethod interactive-stream-p ((stream ansi-stream))
+ (funcall (ansi-stream-misc stream) stream :interactive-p))
+
+ (defmethod interactive-stream-p ((stream fundamental-stream))
+ nil)
+
+ (defmethod interactive-stream-p ((stream stream))
+ (bug-or-error stream 'interactive-stream-p))
+
+ (defmethod interactive-stream-p ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream)))
+\f
+(let ()
(fmakunbound 'output-stream-p)
(defgeneric output-stream-p (stream)
(defmethod output-stream-p ((stream ansi-stream))
(ansi-stream-output-stream-p stream))
+ (defmethod output-stream-p ((stream fundamental-stream))
+ nil)
+
(defmethod output-stream-p ((stream fundamental-output-stream))
t)
(defgeneric stream-unread-char (stream character)
#+sb-doc
(:documentation
- "Un-do the last call to STREAM-READ-CHAR, as in UNREAD-CHAR.
+ "Undo the last call to STREAM-READ-CHAR, as in UNREAD-CHAR.
Return NIL. Every subclass of FUNDAMENTAL-CHARACTER-INPUT-STREAM
must define a method for this function."))
(defmethod stream-read-line ((stream fundamental-character-input-stream))
(let ((res (make-string 80))
- (len 80)
- (index 0))
+ (len 80)
+ (index 0))
(loop
(let ((ch (stream-read-char stream)))
(cond ((eq ch :eof)
- (return (values (shrink-vector res index) t)))
- (t
- (when (char= ch #\newline)
- (return (values (shrink-vector res index) nil)))
- (when (= index len)
- (setq len (* len 2))
- (let ((new (make-string len)))
- (replace new res)
- (setq res new)))
- (setf (schar res index) ch)
- (incf index)))))))
+ (return (values (%shrink-vector res index) t)))
+ (t
+ (when (char= ch #\newline)
+ (return (values (%shrink-vector res index) nil)))
+ (when (= index len)
+ (setq len (* len 2))
+ (let ((new (make-string len)))
+ (replace new res)
+ (setq res new)))
+ (setf (schar res index) ch)
+ (incf index)))))))
(defgeneric stream-clear-input (stream)
#+sb-doc
(defmethod stream-clear-input ((stream fundamental-character-input-stream))
nil)
+(defmethod stream-clear-input ((stream stream))
+ (bug-or-error stream 'stream-clear-input))
+(defmethod stream-clear-input ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
(defgeneric stream-read-sequence (stream seq &optional start end)
+ #+sb-doc
(:documentation
"This is like CL:READ-SEQUENCE, but for Gray streams."))
;;; not updated, and the index of the next element is returned.
(defun basic-io-type-stream-read-sequence (stream seq start end read-fun)
(declare (type sequence seq)
- (type stream stream)
- (type index start)
- (type sequence-end end)
+ (type stream stream)
+ (type index start)
+ (type sequence-end end)
(type function read-fun)
- (values index))
+ (values index))
(let ((end (or end (length seq))))
(declare (type index end))
(etypecase seq
STREAM-WRITE-CHAR."))
(defmethod stream-write-string ((stream fundamental-character-output-stream)
- string &optional (start 0) end)
+ string &optional (start 0) end)
(declare (string string)
- (fixnum start))
+ (fixnum start))
(let ((end (or end (length string))))
(declare (fixnum end))
(do ((pos start (1+ pos)))
- ((>= pos end))
+ ((>= pos end))
(declare (type index pos))
(stream-write-char stream (aref string pos))))
string)
#+sb-doc
(:documentation
"Outputs a new line to the Stream if it is not positioned at the
- begining of a line. Returns T if it output a new line, nil
+ beginning of a line. Returns T if it output a new line, nil
otherwise. Used by FRESH-LINE. The default method uses
STREAM-START-LINE-P and STREAM-TERPRI."))
(defmethod stream-finish-output ((stream fundamental-output-stream))
nil)
+(defmethod stream-finish-output ((stream stream))
+ (bug-or-error stream 'stream-finish-output))
+(defmethod stream-finish-output ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
(defgeneric stream-force-output (stream)
#+sb-doc
(defmethod stream-force-output ((stream fundamental-output-stream))
nil)
+(defmethod stream-force-output ((stream stream))
+ (bug-or-error stream 'stream-force-output))
+(defmethod stream-force-output ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
(defgeneric stream-clear-output (stream)
#+sb-doc
(defmethod stream-clear-output ((stream fundamental-output-stream))
nil)
+(defmethod stream-clear-output ((stream stream))
+ (bug-or-error stream 'stream-clear-output))
+(defmethod stream-clear-output ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
(defgeneric stream-advance-to-column (stream column)
#+sb-doc
#\SPACE character; it returns NIL if STREAM-LINE-COLUMN returns NIL."))
(defmethod stream-advance-to-column ((stream fundamental-character-output-stream)
- column)
+ column)
(let ((current-column (stream-line-column stream)))
(when current-column
(let ((fill (- column current-column)))
- (dotimes (i fill)
- (stream-write-char stream #\Space)))
+ (dotimes (i fill)
+ (stream-write-char stream #\Space)))
T)))
(defgeneric stream-write-sequence (stream seq &optional start end)
+ #+sb-doc
(:documentation
"This is like CL:WRITE-SEQUENCE, but for Gray streams."))
;;; Write the elements of SEQ bounded by START and END to STREAM.
(defun basic-io-type-stream-write-sequence (stream seq start end write-fun)
(declare (type sequence seq)
- (type stream stream)
- (type index start)
- (type sequence-end end)
+ (type stream stream)
+ (type index start)
+ (type sequence-end end)
(type function write-fun)
- (values sequence))
+ (values sequence))
(let ((end (or end (length seq))))
(declare (type index start end))
(etypecase seq
"Used by READ-BYTE; returns either an integer, or the symbol :EOF
if the stream is at end-of-file."))
+(defmethod stream-read-byte ((stream stream))
+ (bug-or-error stream 'stream-read-byte))
+(defmethod stream-read-byte ((non-stream t))
+ (error 'type-error :datum non-stream :expected-type 'stream))
+
(defgeneric stream-write-byte (stream integer)
#+sb-doc
(:documentation
"Implements WRITE-BYTE; writes the integer to the stream and
returns the integer as the result."))
+(defmethod stream-write-byte ((stream stream) integer)
+ (bug-or-error stream 'stream-write-byte))
+(defmethod stream-write-byte ((non-stream t) integer)
+ (error 'type-error :datum non-stream :expected-type 'stream))
+
;; Provide a reasonable default for binary Gray streams. We might be
;; able to do better by specializing on the sequence type, but at
;; least the behaviour is reasonable. --tony 2003/05/08.
(basic-io-type-stream-write-sequence stream seq start end
#'stream-write-byte))
+(defgeneric stream-file-position (stream &optional position-spec)
+ #+sb-doc
+ (:documentation
+ "Used by FILE-POSITION. Returns or changes the current position within STREAM."))
+
+(defmethod stream-file-position ((stream ansi-stream) &optional position-spec)
+ (ansi-stream-file-position stream position-spec))
+
+(defmethod stream-file-position ((stream t) &optional position-spec)
+ (declare (ignore stream position-spec))
+ nil)
+
\f
;;; This is not in the Gray stream proposal, so it is left here
;;; as example code.
projects / sbcl.git / blobdiff