X-Git-Url: http://repo.macrolet.net/gitweb/?a=blobdiff_plain;f=src%2Fpcl%2Fgray-streams.lisp;h=38eb79ea664821b26d8da5bd6c6d3f7669f80833;hb=f980e90c5539626c007de121278e66acdb91d37c;hp=554c904e491e85d5733096b79f56c69a5e93a267;hpb=504959cef381a69a727263ba2a70108f133f8900;p=sbcl.git

diff --git a/src/pcl/gray-streams.lisp b/src/pcl/gray-streams.lisp
index 554c904..38eb79e 100644
--- a/src/pcl/gray-streams.lisp
+++ b/src/pcl/gray-streams.lisp
@@ -10,6 +10,24 @@
 ;;;; 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.
+;;;
+;;; 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))
 
 (fmakunbound 'stream-element-type)
 
@@ -25,6 +43,12 @@
 
 (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))
 
 (defgeneric pcl-open-stream-p (stream)
   #+sb-doc
@@ -39,6 +63,12 @@
 (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)
@@ -58,7 +88,13 @@
   (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))
 
 (let ()
   (fmakunbound 'input-stream-p)
@@ -70,8 +106,36 @@
   (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))
+    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)))
+
+(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)))
 
 (let ()
   (fmakunbound 'output-stream-p)
@@ -83,8 +147,17 @@
   (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))
+    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)))
 
 ;;; character input streams
 ;;;
@@ -157,22 +230,22 @@
 
 (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
@@ -182,8 +255,13 @@
 
 (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."))
 
@@ -195,11 +273,11 @@
 ;;; 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
@@ -301,13 +379,13 @@
   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)
@@ -343,6 +421,10 @@
 
 (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
@@ -352,6 +434,10 @@
 
 (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
@@ -361,6 +447,10 @@
 
 (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
@@ -373,26 +463,27 @@
   #\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
@@ -434,12 +525,22 @@
    "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.
@@ -449,6 +550,18 @@
   (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)
+
 
 ;;; This is not in the Gray stream proposal, so it is left here
 ;;; as example code.