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;;;; -*- Mode: lisp; indent-tabs-mode: nil -*-
;;;
;;; swank-gray.lisp --- Gray stream based IO redirection.
;;;
;;; Created 2003
;;;
;;; This code has been placed in the Public Domain. All warranties
;;; are disclaimed.
;;;
(in-package :swank-backend)
(defclass slime-output-stream (fundamental-character-output-stream)
((output-fn :initarg :output-fn)
(buffer :initform (make-string 8000))
(fill-pointer :initform 0)
(column :initform 0)
(last-flush-time :initform (get-internal-real-time))
(lock :initform (make-recursive-lock :name "buffer write lock"))))
(defmethod stream-write-char ((stream slime-output-stream) char)
(call-with-recursive-lock-held
(slot-value stream 'lock)
(lambda ()
(with-slots (buffer fill-pointer column) stream
(setf (schar buffer fill-pointer) char)
(incf fill-pointer)
(incf column)
(when (char= #\newline char)
(setf column 0)
(force-output stream))
(when (= fill-pointer (length buffer))
(finish-output stream)))))
char)
(defmethod stream-line-column ((stream slime-output-stream))
(call-with-recursive-lock-held
(slot-value stream 'lock)
(lambda ()
(slot-value stream 'column))))
(defmethod stream-line-length ((stream slime-output-stream))
75)
(defmethod stream-finish-output ((stream slime-output-stream))
(call-with-recursive-lock-held
(slot-value stream 'lock)
(lambda ()
(with-slots (buffer fill-pointer output-fn last-flush-time) stream
(let ((end fill-pointer))
(unless (zerop end)
(funcall output-fn (subseq buffer 0 end))
(setf fill-pointer 0)))
(setf last-flush-time (get-internal-real-time)))))
nil)
(defmethod stream-force-output ((stream slime-output-stream))
(call-with-recursive-lock-held
(slot-value stream 'lock)
(lambda ()
(with-slots (last-flush-time fill-pointer) stream
(let ((now (get-internal-real-time)))
(when (> (/ (- now last-flush-time)
(coerce internal-time-units-per-second 'double-float))
0.2)
(finish-output stream))))))
nil)
(defmethod stream-fresh-line ((stream slime-output-stream))
(call-with-recursive-lock-held
(slot-value stream 'lock)
(lambda ()
(with-slots (column) stream
(cond ((zerop column) nil)
(t (terpri stream) t))))))
(defclass slime-input-stream (fundamental-character-input-stream)
((output-stream :initarg :output-stream)
(input-fn :initarg :input-fn)
(buffer :initform "") (index :initform 0)
(lock :initform (make-lock :name "buffer read lock"))))
(defmethod stream-read-char ((s slime-input-stream))
(call-with-lock-held
(slot-value s 'lock)
(lambda ()
(with-slots (buffer index output-stream input-fn) s
(when (= index (length buffer))
(when output-stream
(finish-output output-stream))
(let ((string (funcall input-fn)))
(cond ((zerop (length string))
(return-from stream-read-char :eof))
(t
(setf buffer string)
(setf index 0)))))
(assert (plusp (length buffer)))
(prog1 (aref buffer index) (incf index))))))
(defmethod stream-listen ((s slime-input-stream))
(call-with-lock-held
(slot-value s 'lock)
(lambda ()
(with-slots (buffer index) s
(< index (length buffer))))))
(defmethod stream-unread-char ((s slime-input-stream) char)
(call-with-lock-held
(slot-value s 'lock)
(lambda ()
(with-slots (buffer index) s
(decf index)
(cond ((eql (aref buffer index) char)
(setf (aref buffer index) char))
(t
(warn "stream-unread-char: ignoring ~S (expected ~S)"
char (aref buffer index)))))))
nil)
(defmethod stream-clear-input ((s slime-input-stream))
(call-with-lock-held
(slot-value s 'lock)
(lambda ()
(with-slots (buffer index) s
(setf buffer ""
index 0))))
nil)
(defmethod stream-line-column ((s slime-input-stream))
nil)
(defmethod stream-line-length ((s slime-input-stream))
75)
;;; CLISP extensions
;; We have to define an additional method for the sake of the C
;; function listen_char (see src/stream.d), on which SYS::READ-FORM
;; depends.
;; We could make do with either of the two methods below.
(defmethod stream-read-char-no-hang ((s slime-input-stream))
(call-with-lock-held
(slot-value s 'lock)
(lambda ()
(with-slots (buffer index) s
(when (< index (length buffer))
(prog1 (aref buffer index) (incf index)))))))
;; This CLISP extension is what listen_char actually calls. The
;; default method would call STREAM-READ-CHAR-NO-HANG, so it is a bit
;; more efficient to define it directly.
(defmethod stream-read-char-will-hang-p ((s slime-input-stream))
(with-slots (buffer index) s
(= index (length buffer))))
;;;
(defimplementation make-fn-streams (input-fn output-fn)
(let* ((output (make-instance 'slime-output-stream
:output-fn output-fn))
(input (make-instance 'slime-input-stream
:input-fn input-fn
:output-stream output)))
(values input output)))
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