(return)))))
;;; Entomotomy PEEK-CHAR-WRONGLY-ECHOS-TO-ECHO-STREAM bug, fixed by
-;;; by MRD patch sbcl-devel 2002-11-02 merged ca. sbcl-0.7.9.32...
+;;; MRD patch sbcl-devel 2002-11-02 merged ca. sbcl-0.7.9.32...
(assert (string=
(with-output-to-string (out)
(peek-char #\]
;; (Before the fix, the LET* expression just signalled an error.)
"a"))
-;; 0.7.12 doesn't advance current stream in concatenated streams
-;; correctly when searching a stream for a char to read.
+;;; 0.7.12 doesn't advance current stream in concatenated streams
+;;; correctly when searching a stream for a char to read.
(with-input-from-string (p "")
(with-input-from-string (q "foo")
(let* ((r (make-concatenated-stream p q)))
(peek-char nil r))))
-;; 0.7.14 and previous SBCLs don't have a working INTERACTIVE-STREAM-P
-;; because it called UNIX-ISATTY, which wasn't defined.
+;;; 0.7.14 and previous SBCLs don't have a working INTERACTIVE-STREAM-P
+;;; because it called UNIX-ISATTY, which wasn't defined.
(with-input-from-string (s "a non-interactive stream")
(assert (not (interactive-stream-p s))))
;;; KLUDGE: Unfortunately it's hard to find a reliably interactive
;;; from a script, conceivably even as something like a cron job.
;;; Ideas?
#+nil (assert (eq (interactive-stream-p *terminal-io*) t))
+
+;;; MAKE-STRING-INPUT-STREAM
+;;;
+;;; * Observe FILE-POSITION :START and :END, and allow setting of
+;;; FILE-POSITION beyond the end of string, signalling END-OF-FILE only
+;;; on read.
+(let* ((string (copy-seq "abc"))
+ (stream (make-string-input-stream string)))
+ (assert (char= (read-char stream) #\a))
+ (assert (= 1 (file-position stream)))
+ (assert (file-position stream :start))
+ (assert (= 0 (file-position stream)))
+ (assert (file-position stream :end))
+ (assert (= (length string) (file-position stream)))
+ (assert (file-position stream (1- (file-position stream))))
+ (assert (char= (read-char stream) #\c))
+ (assert (file-position stream (1- (file-position stream))))
+ (assert (char= (read-char stream) #\c))
+ (assert (file-position stream :end))
+ (let ((eof (cons nil nil)))
+ (assert (eq (read-char stream nil eof) eof)))
+ (assert (file-position stream 10))
+ (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
+ (assert (null val))
+ (assert (typep cond 'error)))
+ (multiple-value-bind (val cond) (ignore-errors (read-char stream))
+ (assert (null val))
+ (assert (typep cond 'end-of-file))))
+
+;;; MAKE-STRING-OUTPUT-STREAM
+;;;
+;;; * Observe FILE-POSITION :START and :END, and allow setting of
+;;; FILE-POSITION to an arbitrary index.
+;;;
+;;; * END will always refer to the farthest position of stream so-far
+;;; seen, and setting FILE-POSITION beyond the current END will extend
+;;; the string/stream with uninitialized elements.
+;;;
+;;; * Rewinding the stream works with overwriting semantics.
+;;;
+(let ((stream (make-string-output-stream)))
+ (princ "abcd" stream)
+ (assert (= 4 (file-position stream)))
+ (assert (file-position stream :start))
+ (assert (= 0 (file-position stream)))
+ (princ "0" stream)
+ (assert (= 1 (file-position stream)))
+ (file-position stream 2)
+ (assert (= 2 (file-position stream)))
+ (princ "2" stream)
+ (assert (file-position stream :end))
+ (assert (= 4 (file-position stream)))
+ (assert (file-position stream 6))
+ (assert (file-position stream 4))
+ (assert (file-position stream :end))
+ (assert (= 6 (file-position stream)))
+ (assert (file-position stream 4))
+ (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
+ (assert (null val))
+ (assert (typep cond 'error)))
+ (princ "!!" stream)
+ (assert (equal "0b2d!!" (get-output-stream-string stream))))
+
+;;; WITH-OUTPUT-TO-STRING (when provided with a string argument)
+;;;
+;;; * Observe FILE-POSITION :START and :END, and allow setting of
+;;; FILE-POSITION to an arbitrary index. If the new position is beyond
+;;; the end of string and the string is adjustable the string will be
+;;; implicitly extended, otherwise an error will be signalled. The
+;;; latter case is provided for in the code, but not currently
+;;; excercised since SBCL fill-pointer arrays are always (currently) adjustable.
+;;;
+;;; * END will refer to the ARRAY-TOTAL-SIZE of string, not
+;;; FILL-POINTER, since by definition the FILE-POSITION will always be
+;;; a FILL-POINTER, so that would be of limited use.
+;;;
+;;; * Rewinding the stream works with owerwriting semantics.
+;;;
+#+nil (let ((str (make-array 0
+ :element-type 'character
+ :adjustable nil
+ :fill-pointer t)))
+ (with-output-to-string (stream str)
+ (princ "abcd" stream)
+ (assert (= 4 (file-position stream)))
+ (assert (file-position stream :start))
+ (assert (= 0 (file-position stream)))
+ (princ "0" stream)
+ (assert (= 1 (file-position stream)))
+ (file-position stream 2)
+ (assert (= 2 (file-position stream)))
+ (princ "2" stream)
+ (assert (file-position stream :end))
+ (assert (= 4 (file-position stream)))
+ (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
+ (assert (null val))
+ (assert (typep cond 'error)))
+ (multiple-value-bind (val cond) (ignore-errors (file-position stream 6))
+ (assert (null val))
+ (assert (typep cond 'error)))
+ (assert (equal "0b2d" str))))
+
+(let ((str (make-array 0
+ :element-type 'character
+ :adjustable nil
+ :fill-pointer t)))
+ (with-output-to-string (stream str)
+ (princ "abcd" stream)
+ (assert (= 4 (file-position stream)))
+ (assert (file-position stream :start))
+ (assert (= 0 (file-position stream)))
+ (princ "0" stream)
+ (assert (= 1 (file-position stream)))
+ (file-position stream 2)
+ (assert (= 2 (file-position stream)))
+ (princ "2" stream)
+ (assert (file-position stream :end))
+ (assert (= 4 (file-position stream)))
+ (assert (file-position stream 6))
+ (assert (file-position stream 4))
+ (assert (file-position stream :end))
+ (assert (= 6 (file-position stream)))
+ (assert (file-position stream 4))
+ (multiple-value-bind (val cond) (ignore-errors (file-position stream -1))
+ (assert (null val))
+ (assert (typep cond 'error)))
+ (princ "!!" stream)
+ (assert (equal "0b2d!!" str))))
+
+;;; MAKE-STRING-OUTPUT-STREAM and WITH-OUTPUT-TO-STRING take an
+;;; :ELEMENT-TYPE keyword argument
+(macrolet ((frob (element-type-form)
+ `(progn
+ (let ((s (with-output-to-string
+ (s nil ,@(when element-type-form
+ `(:element-type ,element-type-form))))))
+ (assert (typep s '(simple-array ,(if element-type-form
+ (eval element-type-form)
+ 'character)
+ (0)))))
+ (get-output-stream-string
+ (make-string-output-stream
+ ,@(when element-type-form
+ `(:element-type ,element-type-form)))))))
+ (frob nil)
+ (frob 'character)
+ (frob 'base-char)
+ (frob 'nil))
projects / sbcl.git / blobdiff