(in-package "SB!IMPL")
-(deftype string-stream ()
- '(or string-input-stream string-output-stream
- fill-pointer-output-stream))
-
;;;; standard streams
;;; The initialization of these streams is performed by
(in-fun echo-bin read-byte ansi-stream-bout stream-write-byte
eof-error-p eof-value))
-
(defun echo-misc (stream operation &optional arg1 arg2)
(let* ((in (two-way-stream-input-stream stream))
(out (two-way-stream-output-stream stream)))
(set-closed-flame stream))
(:peek-char
;; For the special case of peeking into an echo-stream
- ;; arg1 is peek-type, arg2 is (eof-error-p eof-value)
+ ;; arg1 is PEEK-TYPE, arg2 is (EOF-ERROR-P EOF-VALUE)
;; returns peeked-char, eof-value, or errors end-of-file
- (flet ((outfn (c)
- (if (ansi-stream-p out)
- (funcall (ansi-stream-out out) out c)
- ;; gray-stream
- (stream-write-char out c))))
- (generalized-peeking-mechanism
- arg1 (second arg2) char
- (read-char in (first arg2) (second arg2))
- (unread-char char in)
- (outfn char))))
+ ;;
+ ;; Note: This code could be moved into PEEK-CHAR if desired.
+ ;; I am unsure whether this belongs with echo-streams because it is
+ ;; echo-stream specific, or PEEK-CHAR because it is peeking code.
+ ;; -- mrd 2002-11-18
+ ;;
+ ;; UNREAD-CHAR-P indicates whether the current character was one
+ ;; that was previously unread. In that case, we need to ensure that
+ ;; the semantics for UNREAD-CHAR are held; the character should
+ ;; not be echoed again.
+ (let ((unread-char-p nil))
+ (flet ((outfn (c)
+ (unless unread-char-p
+ (if (ansi-stream-p out)
+ (funcall (ansi-stream-out out) out c)
+ ;; gray-stream
+ (stream-write-char out c))))
+ (infn ()
+ ;; Obtain input from unread buffer or input stream,
+ ;; and set the flag appropriately.
+ (cond ((not (null (echo-stream-unread-stuff stream)))
+ (setf unread-char-p t)
+ (pop (echo-stream-unread-stuff stream)))
+ (t
+ (setf unread-char-p nil)
+ (read-char in (first arg2) (second arg2))))))
+ (generalized-peeking-mechanism
+ arg1 (second arg2) char
+ (infn)
+ (unread-char char in)
+ (outfn char)))))
(t
(or (if (ansi-stream-p in)
(funcall (ansi-stream-misc in) in operation arg1 arg2)
(if (ansi-stream-p out)
(funcall (ansi-stream-misc out) out operation arg1 arg2)
(stream-misc-dispatch out operation arg1 arg2)))))))
+\f
+;;;; base STRING-STREAM stuff
+(defstruct (string-stream
+ (:include ansi-stream)
+ (:constructor nil)
+ (:copier nil))
+ (string nil :type string))
\f
-;;;; string input streams
+;;;; STRING-INPUT-STREAM stuff
(defstruct (string-input-stream
- (:include ansi-stream
+ (:include string-stream
(in #'string-inch)
(bin #'string-binch)
(n-bin #'string-stream-read-n-bytes)
- (misc #'string-in-misc))
+ (misc #'string-in-misc)
+ (string nil :type simple-string))
(:constructor internal-make-string-input-stream
(string current end))
(:copier nil))
- (string nil :type simple-string)
(current nil :type index)
(end nil :type index))
(internal-make-string-input-stream (coerce string 'simple-string)
start end))
\f
-;;;; string output streams
+;;;; STRING-OUTPUT-STREAM stuff
(defstruct (string-output-stream
- (:include ansi-stream
+ (:include string-stream
(out #'string-ouch)
(sout #'string-sout)
- (misc #'string-out-misc))
+ (misc #'string-out-misc)
+ ;; The string we throw stuff in.
+ (string (make-string 40) :type simple-string))
(:constructor make-string-output-stream ())
(:copier nil))
- ;; The string we throw stuff in.
- (string (make-string 40) :type simple-string)
;; Index of the next location to use.
(index 0 :type fixnum))
(satisfies array-has-fill-pointer-p)))
(defstruct (fill-pointer-output-stream
- (:include ansi-stream
+ (:include string-stream
(out #'fill-pointer-ouch)
(sout #'fill-pointer-sout)
- (misc #'fill-pointer-misc))
+ (misc #'fill-pointer-misc)
+ ;; a string with a fill pointer where we stuff
+ ;; the stuff we write
+ (string (error "missing argument")
+ :type string-with-fill-pointer
+ :read-only t))
(:constructor make-fill-pointer-output-stream (string))
- (:copier nil))
- ;; a string with a fill pointer where we stuff the stuff we write
- (string (error "missing argument")
- :type string-with-fill-pointer
- :read-only t))
+ (:copier nil)))
(defun fill-pointer-ouch (stream character)
(let* ((buffer (fill-pointer-output-stream-string stream))