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"Returns a string of all the characters sent to a stream made by
Make-String-Output-Stream since the last call to this function."
(declare (type string-output-stream stream))
(let* ((length (string-output-stream-index stream))
(result (make-string length)))
(replace result (string-output-stream-string stream))
(setf (string-output-stream-index stream) 0)
result))
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(defun dump-output-stream-string (in-stream out-stream)
"Dumps the characters buffer up in the In-Stream to the Out-Stream as
Get-Output-Stream-String would return them."
(write-string (string-output-stream-string in-stream) out-stream
:start 0 :end (string-output-stream-index in-stream))
(setf (string-output-stream-index in-stream) 0))
;;;; Fill-pointer streams:
;;;
;;; Fill pointer string output streams are not explicitly mentioned in
;;; the CLM, but they are required for the implementation of With-Output-To-String.
(defstruct (fill-pointer-output-stream
(:include stream
(out #'fill-pointer-ouch)
(sout #'fill-pointer-sout)
(misc #'fill-pointer-misc))
(:print-function
(lambda (s stream d)
(declare (ignore s d))
(write-string "#<Fill-Pointer String Output Stream>" stream)))
(:constructor make-fill-pointer-output-stream (string)))
;; The string we throw stuff in.
string)
(defun fill-pointer-ouch (stream character)
(let* ((buffer (fill-pointer-output-stream-string stream))
(current (fill-pointer buffer))
(current+1 (1+ current)))
(declare (fixnum current))
(with-array-data ((workspace buffer) (start) (end))
(declare (simple-string workspace))
(let ((offset-current (+ start current)))
(declare (fixnum offset-current))
(if (= offset-current end)
(let* ((new-length (* current 2))
(new-workspace (make-string new-length)))
(declare (simple-string new-workspace))
(%primitive byte-blt workspace start new-workspace 0 current)
(setf workspace new-workspace)
(setf offset-current current)
(set-array-header buffer workspace new-length
current+1 0 new-length nil))
(setf (fill-pointer buffer) current+1))
(setf (schar workspace offset-current) character)))
current+1))
(defun fill-pointer-sout (stream string start end)
(declare (simple-string string) (fixnum start end))
(let* ((buffer (fill-pointer-output-stream-string stream))
(current (fill-pointer buffer))
(string-len (- end start))
(dst-end (+ string-len current)))
(declare (fixnum current dst-end string-len))
(with-array-data ((workspace buffer) (dst-start) (dst-length))
(declare (simple-string workspace))
(let ((offset-dst-end (+ dst-start dst-end))
(offset-current (+ dst-start current)))
(declare (fixnum offset-dst-end offset-current))
(if (> offset-dst-end dst-length)
(let* ((new-length (+ (the fixnum (* current 2)) string-len))
(new-workspace (make-string new-length)))
(declare (simple-string new-workspace))
(%primitive byte-blt workspace dst-start new-workspace 0 current)
(setf workspace new-workspace)
(setf offset-current current)
(setf offset-dst-end dst-end)
(set-array-header buffer workspace new-length
dst-end 0 new-length nil))
(setf (fill-pointer buffer) dst-end))
(%primitive byte-blt string start
workspace offset-current offset-dst-end)))
dst-end))
(defun fill-pointer-misc (stream operation &optional arg1 arg2)
(declare (ignore arg1 arg2))
(case operation
(:charpos
(let* ((buffer (fill-pointer-output-stream-string stream))
(current (fill-pointer buffer)))
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(with-array-data ((string buffer) (start) (end current))
(declare (simple-string string) (ignore start))
(let ((found (position #\newline string :test #'char=
:end end :from-end t)))
(if found
(- end (the fixnum found))
current)))))
(:element-type 'string-char)))
;;;; Indenting streams:
(defstruct (indenting-stream (:include stream
(out #'indenting-out)
(sout #'indenting-sout)
(misc #'indenting-misc))
(:print-function %print-indenting-stream)
(:constructor make-indenting-stream (stream)))
;; The stream we're based on:
stream
;; How much we indent on each line:
(indentation 0))
(setf (documentation 'make-indenting-stream 'function)
"Returns an ouput stream which indents its output by some amount.")
(defun %print-indenting-stream (s stream d)
(declare (ignore s d))
(write-string "#<Indenting Stream>" stream))
;;; Indenting-Indent writes the right number of spaces needed to indent output on
;;; the given Stream based on the specified Sub-Stream.
(defmacro indenting-indent (stream sub-stream)
`(do ((i 0 (+ i 60))
(indentation (indenting-stream-indentation ,stream)))
((>= i indentation))
(funcall (stream-sout ,sub-stream) ,sub-stream
" "
0 (min 60 (- indentation i)))))
;;; Indenting-Out writes a character to an indenting stream.
(defun indenting-out (stream char)
(let ((sub-stream (indenting-stream-stream stream)))
(funcall (stream-out sub-stream) sub-stream char)
(if (char= char #\newline)
(indenting-indent stream sub-stream))))
;;; Indenting-Sout writes a string to an indenting stream.
(defun indenting-sout (stream string start end)
(declare (simple-string string) (fixnum start end))
(do ((i start)
(sub-stream (indenting-stream-stream stream)))
((= i end))
(let ((newline (position #\newline string :start i :end end)))
(cond (newline
(funcall (stream-sout sub-stream) sub-stream string i (1+ newline))
(indenting-indent stream sub-stream)
(setq i (+ newline 1)))
(t
(funcall (stream-sout sub-stream) sub-stream string i end)
(setq i end))))))
;;; Indenting-Misc just treats just the :Line-Length message differently.
;;; Indenting-Charpos says the charpos is the charpos of the base stream minus
;;; the stream's indentation.
(defun indenting-misc (stream operation &optional arg1 arg2)
(let* ((sub-stream (indenting-stream-stream stream))
(method (stream-misc sub-stream)))
(case operation
(:line-length
(let ((line-length (funcall method sub-stream operation)))
(if line-length
(- line-length (indenting-stream-indentation stream)))))
(:charpos
(let* ((sub-stream (indenting-stream-stream stream))
(charpos (funcall method sub-stream operation)))
(if charpos
(- charpos (indenting-stream-indentation stream)))))
(t
(funcall method sub-stream operation arg1 arg2)))))
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(proclaim '(maybe-inline read-char unread-char read-byte listen))
;;;; Case frobbing streams, used by format ~(...~).
(defstruct (case-frob-stream
(:include stream
(:misc #'case-frob-misc))
(:constructor %make-case-frob-stream (target out sout)))
(target (required-argument) :type stream))
(defun make-case-frob-stream (target kind)
"Returns a stream that sends all output to the stream TARGET, but modifies
the case of letters, depending on KIND, which should be one of:
:upcase - convert to upper case.
:downcase - convert to lower case.
:capitalize - convert the first letter of words to upper case and the
rest of the word to lower case.
:capitalize-first - convert the first letter of the first word to upper
case and everything else to lower case."
(declare (type stream target)
(type (member :upcase :downcase :capitalize :capitalize-first)
kind)
(values stream))
(if (case-frob-stream-p target)
;; If we are going to be writing to a stream that already does case
;; frobbing, why bother frobbing the case just so it can frob it
;; again?
target
(multiple-value-bind
(out sout)
(ecase kind
(:upcase
(values #'case-frob-upcase-out
#'case-frob-upcase-sout))
(:downcase
(values #'case-frob-downcase-out
#'case-frob-downcase-sout))
(:capitalize
(values #'case-frob-capitalize-out
#'case-frob-capitalize-sout))
(:capitalize-first
(values #'case-frob-capitalize-first-out
#'case-frob-capitalize-first-sout)))
(%make-case-frob-stream target out sout))))
(defun case-frob-misc (stream op &optional arg1 arg2)
(declare (type case-frob-stream stream))
(case op
(:close)
(t
(let ((target (case-frob-stream-target stream)))
(funcall (stream-misc target) target op arg1 arg2)))))
(defun case-frob-upcase-out (stream char)
(declare (type case-frob-stream stream)
(let ((target (case-frob-stream-target stream)))
(funcall (stream-out target) target (char-upcase char))))
(defun case-frob-upcase-sout (stream str start end)
(declare (type case-frob-stream stream)
(type simple-base-string str)
(type index start)
(type (or index null) end))
(let* ((target (case-frob-stream-target stream))
(len (length str))
(end (or end len)))
(funcall (stream-sout target) target
(if (and (zerop start) (= len end))
(string-upcase str)
(nstring-upcase (subseq str start end)))
0
(- end start))))
(defun case-frob-downcase-out (stream char)
(declare (type case-frob-stream stream)
(let ((target (case-frob-stream-target stream)))
(funcall (stream-out target) target (char-downcase char))))
(defun case-frob-downcase-sout (stream str start end)
(declare (type case-frob-stream stream)
(type simple-base-string str)
(type index start)
(type (or index null) end))
(let* ((target (case-frob-stream-target stream))
(len (length str))
(end (or end len)))
(funcall (stream-sout target) target
(if (and (zerop start) (= len end))
(string-downcase str)
(nstring-downcase (subseq str start end)))
0
(- end start))))
(defun case-frob-capitalize-out (stream char)
(declare (type case-frob-stream stream)
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(let ((target (case-frob-stream-target stream)))
(cond ((alphanumericp char)
(funcall (stream-out target) target (char-upcase char))
(setf (case-frob-stream-out stream)
#'case-frob-capitalize-aux-out)
(setf (case-frob-stream-sout stream)
#'case-frob-capitalize-aux-sout))
(t
(funcall (stream-out target) target char)))))
(defun case-frob-capitalize-sout (stream str start end)
(declare (type case-frob-stream stream)
(type simple-base-string str)
(type index start)
(type (or index null) end))
(let* ((target (case-frob-stream-target stream))
(str (subseq str start end))
(len (length str))
(inside-word nil))
(dotimes (i len)
(let ((char (schar str i)))
(cond ((not (alphanumericp char))
(setf inside-word nil))
(inside-word
(setf (schar str i) (char-downcase char)))
(t
(setf inside-word t)
(setf (schar str i) (char-upcase char))))))
(when inside-word
(setf (case-frob-stream-out stream)
#'case-frob-capitalize-aux-out)
(setf (case-frob-stream-sout stream)
#'case-frob-capitalize-aux-sout))
(funcall (stream-sout target) target str 0 len)))
(defun case-frob-capitalize-aux-out (stream char)
(declare (type case-frob-stream stream)
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(let ((target (case-frob-stream-target stream)))
(cond ((alphanumericp char)
(funcall (stream-out target) target (char-downcase char)))
(t
(funcall (stream-out target) target char)
(setf (case-frob-stream-out stream)
#'case-frob-capitalize-out)
(setf (case-frob-stream-sout stream)
#'case-frob-capitalize-sout)))))
(defun case-frob-capitalize-aux-sout (stream str start end)
(declare (type case-frob-stream stream)
(type simple-base-string str)
(type index start)
(type (or index null) end))
(let* ((target (case-frob-stream-target stream))
(str (subseq str start end))
(len (length str))
(inside-word t))
(dotimes (i len)
(let ((char (schar str i)))
(cond ((not (alphanumericp char))
(setf inside-word nil))
(inside-word
(setf (schar str i) (char-downcase char)))
(t
(setf inside-word t)
(setf (schar str i) (char-upcase char))))))
(unless inside-word
(setf (case-frob-stream-out stream)
#'case-frob-capitalize-out)
(setf (case-frob-stream-sout stream)
#'case-frob-capitalize-sout))
(funcall (stream-sout target) target str 0 len)))
(defun case-frob-capitalize-first-out (stream char)
(declare (type case-frob-stream stream)
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(let ((target (case-frob-stream-target stream)))
(cond ((alphanumericp char)
(funcall (stream-out target) target (char-upcase char))
(setf (case-frob-stream-out stream)
#'case-frob-downcase-out)
(setf (case-frob-stream-sout stream)
#'case-frob-downcase-sout))
(t
(funcall (stream-out target) target char)))))
(defun case-frob-capitalize-first-sout (stream str start end)
(declare (type case-frob-stream stream)
(type simple-base-string str)
(type index start)
(type (or index null) end))
(let* ((target (case-frob-stream-target stream))
(str (subseq str start end))
(len (length str)))
(dotimes (i len)
(let ((char (schar str i)))
(when (alphanumericp char)
(setf (schar str i) (char-upcase char))
(do ((i (1+ i) (1+ i)))
((= i len))
(setf (schar str i) (char-downcase (schar str i))))
(setf (case-frob-stream-out stream)
#'case-frob-downcase-out)
(setf (case-frob-stream-sout stream)
#'case-frob-downcase-sout)
(return))))
(funcall (stream-sout target) target str 0 len)))
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;;;; Public interface from "EXTENSIONS" package.
(defstruct (stream-command (:print-function print-stream-command)
(:constructor make-stream-command
(name &optional args)))
(name nil :type symbol)
(args nil :type list))
(defun print-stream-command (obj str n)
(declare (ignore n))
(format str "#<Stream-Cmd ~S>" (stream-command-name obj)))
;;; GET-STREAM-COMMAND -- Public.
;;;
;;; We can't simply call the stream's misc method because because nil is an
;;; ambiguous return value: does it mean text arrived, or does it mean the
;;; stream's misc method had no :get-command implementation. We can't return
;;; nil until there is text input. We don't need to loop because any stream
;;; implementing :get-command would wait until it had some input. If the
;;; LISTEN fails, then we have some random stream we must wait on.
;;;
(defun get-stream-command (stream)
"This takes a stream and waits for text or a command to appear on it. If
text appears before a command, this returns nil, and otherwise it returns
a command."
(let ((cmdp (funcall (lisp::stream-misc stream) stream :get-command)))
(cond (cmdp)
((listen stream)
nil)
(t
;; This waits for input and returns nil when it arrives.
(unread-char (read-char stream) stream)))))