/usr/share/common-lisp/source/mcclim/Goatee/editing-stream.lisp is in cl-mcclim 0.9.6.dfsg.cvs20100315-2.
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;;; (c) copyright 2002 by Tim Moore (moore@bricoworks.com)
;;; This library is free software; you can redistribute it and/or
;;; modify it under the terms of the GNU Library General Public
;;; License as published by the Free Software Foundation; either
;;; version 2 of the License, or (at your option) any later version.
;;;
;;; This library is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
;;; Library General Public License for more details.
;;;
;;; You should have received a copy of the GNU Library General Public
;;; License along with this library; if not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307 USA.
(in-package :goatee)
;;; Interface between input-editing-streams and Goatee areas.
(defclass editing-stream-snapshot ()
((buffer :reader stream-input-buffer
:initform (make-array 16 :adjustable t :fill-pointer 0))
(insertion-pointer :accessor stream-insertion-pointer :initform 0)
(scan-pointer :accessor stream-scan-pointer :initform 0)))
(defclass goatee-input-editing-mixin ()
((area :accessor area :initarg :area)
(snapshot :accessor snapshot :initarg :snapshot
:initform (make-instance 'editing-stream-snapshot))))
(defmethod cursor-visibility ((stream goatee-input-editing-mixin))
(cursor-visibility (area stream)))
(defmethod (setf cursor-visibility) (visibility
(stream goatee-input-editing-mixin))
(setf (cursor-visibility (area stream)) visibility))
(defclass noise-extent (extent)
()
(:documentation "Characters within the extent are input editor noise
strings. Eventually these should be read-only and atomic."))
(defclass accept-result-extent (extent)
((object :accessor object :initarg :object)
(result-type :accessor result-type :initarg :result-type))
(:documentation "The extent is read with a single read-gesture;
result is returned."))
;;; Stream is the encapsulated stream
(defmethod initialize-instance :after ((obj goatee-input-editing-mixin)
&rest args
&key stream (initial-contents "")
(cursor-visibility t)
(background-ink
(medium-background stream))
single-line)
(multiple-value-bind (cx cy)
(stream-cursor-position stream)
(let ((max-width (- (stream-text-margin stream) cx)))
;; XXX hack to give area a fixed size rectangle that can be highlighted
(with-output-recording-options (stream :record t)
(draw-rectangle* stream cx cy
(+ cx max-width) (+ cy (stream-line-height stream))
:ink background-ink
:filled t))
(climi::with-keywords-removed (args (:initial-contents :single-line))
(setf (area obj)
(apply #'make-instance
'simple-screen-area
:area-stream stream
:buffer (make-instance 'editable-buffer
:initial-contents
initial-contents
:newline-character (if single-line
nil
#\Newline))
:x-position cx
:y-position cy
:cursor-visibility cursor-visibility
:max-width max-width
:allow-other-keys t
args)))
;; XXX Really add it here?
(stream-add-output-record stream (area obj))
#+nil (redisplay-area (area obj))
;; initialize input-editing-stream state to conform to our reality
(make-input-editing-stream-snapshot obj (area obj)))))
(defvar climi::*noise-string-start*)
(defvar climi::*noise-string*)
(defun make-input-editing-stream-snapshot (snapshot area)
(let ((buffer (buffer area))
(input-buffer (stream-input-buffer snapshot)))
(multiple-value-bind (point-line point-pos)
(point* buffer)
(setf (fill-pointer input-buffer) 0)
(map-over-region
#'(lambda (line pos)
(let ((noise nil))
(map-over-extents-at-location*
#'(lambda (extent line pos)
(cond ((typep extent 'noise-extent)
(if (and (eq line (line (bp-start extent)))
(eql pos (pos (bp-start extent))))
(setq noise climi::*noise-string-start*)
(setq noise climi::*noise-string*)))
((typep extent 'accept-result-extent)
(if (and (eq line (line (bp-start extent)))
(eql pos (pos (bp-start extent))))
(setq noise extent)
(setq noise climi::*noise-string*)))))
line
pos
:start-state :closed
:end-state :open)
(vector-push-extend (or noise (char-ref line pos))
input-buffer)))
buffer
(buffer-start buffer)
(buffer-end buffer))
(setf (stream-insertion-pointer snapshot)
(offset-location* buffer point-line point-pos)))))
(defmethod update-input-editing-stream ((stream goatee-input-editing-mixin))
(let ((area (area stream))
(snapshot (snapshot stream)))
(make-input-editing-stream-snapshot snapshot area)
(let ((first-mismatch (mismatch (stream-input-buffer snapshot)
(stream-input-buffer stream)))
(snapshot-buffer (stream-input-buffer snapshot))
(stream-buffer (stream-input-buffer stream)))
(setf (stream-insertion-pointer stream)
(stream-insertion-pointer snapshot))
(when (< (car (array-dimensions stream-buffer))
(fill-pointer snapshot-buffer))
(adjust-array stream-buffer (fill-pointer snapshot-buffer)))
(setf (fill-pointer stream-buffer) (fill-pointer snapshot-buffer))
(when (and first-mismatch
(>= (fill-pointer snapshot-buffer) first-mismatch))
(replace stream-buffer snapshot-buffer
:start1 first-mismatch
:start2 first-mismatch))
first-mismatch)))
(defmethod stream-process-gesture ((stream goatee-input-editing-mixin)
gesture
type)
(declare (ignore type))
(when (activation-gesture-p gesture)
(setf (stream-insertion-pointer stream)
(fill-pointer (stream-input-buffer stream)))
(set-editing-stream-insertion-pointer stream
(stream-insertion-pointer stream))
(setf (climi::activation-gesture stream) gesture)
(rescan-if-necessary stream)
(return-from stream-process-gesture gesture))
(let ((area (area stream))
(snapshot (snapshot stream)))
(execute-gesture-command gesture area *simple-area-gesture-table*)
(make-input-editing-stream-snapshot snapshot area)
(let ((first-mismatch (mismatch (stream-input-buffer snapshot)
(stream-input-buffer stream))))
(unwind-protect
(cond ((null first-mismatch)
;; No change actually took place, event though IP may have
;; moved.
nil)
((< first-mismatch (stream-scan-pointer stream))
;; Throw out. Buffer is still updated by protect forms
(immediate-rescan stream))
((and (eql first-mismatch
(1- (stream-insertion-pointer snapshot)))
(eql (aref (stream-input-buffer snapshot) first-mismatch)
gesture))
;; As best we can tell an insertion happened: one gesture was
;; entered it was inserted in the buffer. There may be other
;; changes above IP, but we don't care.
gesture)
(t
;; Other random changes, but we want to allow more editing
;; before scanning them.
(queue-rescan stream)
nil))
(let ((snapshot-buffer (stream-input-buffer snapshot))
(stream-buffer (stream-input-buffer stream)))
(setf (stream-insertion-pointer stream)
(stream-insertion-pointer snapshot))
(when (< (car (array-dimensions stream-buffer))
(fill-pointer snapshot-buffer))
(adjust-array stream-buffer (fill-pointer snapshot-buffer)))
(setf (fill-pointer stream-buffer) (fill-pointer snapshot-buffer))
(when (and first-mismatch
(>= (fill-pointer snapshot-buffer) first-mismatch))
(replace stream-buffer snapshot-buffer
:start1 first-mismatch
:start2 first-mismatch)))))))
(defun reposition-stream-cursor (stream)
"Moves the cursor somewhere clear of Goatee's editing area."
(let ((max-y 0))
(map-over-output-records #'(lambda (r)
(setf max-y (max max-y (bounding-rectangle-max-y r))))
(stream-output-history stream))
(setf (stream-cursor-position stream)
(values 0 max-y))))
(defmethod climi::finalize ((stream goatee-input-editing-mixin)
input-sensitizer)
(call-next-method)
(setf (cursor-visibility (cursor (area stream))) nil)
(let ((real-stream (encapsulating-stream-stream stream))
(record (area stream)))
(when input-sensitizer
(erase-output-record record real-stream)
(funcall input-sensitizer
real-stream
#'(lambda ()
(stream-add-output-record real-stream record)
(when (stream-drawing-p real-stream)
#+nil (format *trace-output* "Redisplaying ~S~&" record)
(replay record real-stream)))))
(reposition-stream-cursor real-stream)))
;;; Hopefully only used on small buffers.
(defun location*-offset (buffer offset)
(loop for line = (dbl-head (lines buffer)) then (next line)
for size = (and line (size line))
while line
summing size into total-offset
do (when (>= total-offset offset)
(let ((pos (- size (- total-offset offset))))
(if (> pos (line-last-point line))
(return (values (next line) 0))
(return (values line pos)))))
finally (error 'goatee-error
:format-control "Offset ~S is greater than the ~
size of buffer ~S"
:format-arguments (list offset buffer))))
(defun offset-location* (buffer line pos)
(loop with end-line = (location* (buffer-end buffer))
for buf-line = (location* (buffer-start buffer)) then (next buf-line)
until (or (eq buf-line line) (eq buf-line end-line))
summing (size buf-line) into total-offset
finally (progn
(unless (eq buf-line line)
(error 'goatee-error
:format "Location line ~S pos ~S isn't in buffer ~S"
:format-arguments (list line pos buffer)))
(return (+ total-offset pos)))))
(defgeneric set-editing-stream-insertion-pointer (stream pointer))
(defmethod set-editing-stream-insertion-pointer
((stream goatee-input-editing-mixin) pointer)
(let* ((area (area stream))
(buffer (buffer area)))
(setf (point* buffer) (location*-offset buffer pointer))
(redisplay-area area)))
(defmethod (setf stream-insertion-pointer) :after
((new-value integer) (stream goatee-input-editing-mixin))
(set-editing-stream-insertion-pointer stream new-value))
(defun %replace-input (stream new-input start end buffer-start
rescan rescan-supplied-p
extent-class &rest extent-args)
(let* ((scan-pointer (stream-scan-pointer stream))
(area (area stream))
(buf (buffer area))
(del-chars (- scan-pointer buffer-start)))
(when (stream-rescanning-p stream)
(return-from %replace-input nil))
(if (<= 0 del-chars)
(progn
(with-point (buf)
(multiple-value-bind (line pos)
(location*-offset buf buffer-start)
(when (> del-chars 0)
(delete-char buf del-chars :line line :pos pos))
;; location should be preserved across the delete-char, but
;; it would be safest to use a buffer pointer or something...
(let ((extent (and extent-class
(apply #'make-instance extent-class
:start-line line :start-pos pos
extent-args))))
(insert buf new-input
:line line :pos pos :start start :end end)
(when extent
(setf (start-state extent) :open)
(setf (end-state extent) :open))
(make-input-editing-stream-snapshot stream area)
;; If not rescanning, adjust scan pointer to point after new
;; input
(if (and rescan-supplied-p (null rescan))
(setf (stream-scan-pointer stream)
(offset-location* buf
(line (point buf))
(pos (point buf))))
(queue-rescan stream)))))
;; XXX Redundant with make-input-editing-stream-snapshot?
(setf (stream-insertion-pointer stream)
(offset-location* buf (line (point buf)) (pos (point buf))))
(redisplay-area area))
(warn "replace-input stream ~S: buffer-start ~S is greater than ~
scan-pointer ~S. Don't know how to deal with that."
stream
buffer-start
scan-pointer))))
(defvar climi::*current-input-stream*)
(defvar climi::*current-input-position*)
(defmethod replace-input ((stream goatee-input-editing-mixin) new-input
&key
(start 0)
(end (length new-input))
(buffer-start nil buffer-start-supplied-p)
(rescan nil rescan-supplied-p))
(unless buffer-start-supplied-p
(if (eq stream climi::*current-input-stream*)
(setq buffer-start climi::*current-input-position*)
(setq buffer-start 0)))
(%replace-input stream new-input
start end buffer-start rescan rescan-supplied-p nil))
(defun present-acceptably-to-string
(object type view for-context-type)
(flet ((present-it (acceptably)
(present-to-string object type
:view view
:acceptably acceptably
:for-context-type for-context-type)))
(let* ((acceptably t)
(printed-rep nil))
(handler-case
(setq printed-rep (present-it t))
(error ()
(setq acceptably nil)
(setq printed-rep (present-it nil))))
(values printed-rep (if acceptably
nil
object)))))
(defmethod presentation-replace-input
((stream goatee-input-editing-mixin)
object type view
&key
(buffer-start nil buffer-start-supplied-p)
(rescan nil rescan-supplied-p)
query-identifier
(for-context-type type))
(declare (ignore query-identifier))
(multiple-value-bind (printed-rep accept-object)
(present-acceptably-to-string object type view
for-context-type)
(unless buffer-start-supplied-p
(if (eq stream climi::*current-input-stream*)
(setq buffer-start climi::*current-input-position*)
(setq buffer-start 0)))
(apply #'%replace-input stream printed-rep
0 (length printed-rep) buffer-start rescan rescan-supplied-p
(if accept-object
`(accept-result-extent :object ,accept-object
:result-type ,type)
'(nil)))))
;;; There used to be complicated logic here to support output when
;;; rescanning, but it seems to be very hairy to get right in
;;; combination with read-gesture's behavior upon seeing noise
;;; strings, especially with respect to peek and unread-gesture. So, just
;;; suppress printing the noise string unless we're at the end of the
;;; buffer and can't screw anything up.
(defmethod input-editor-format ((stream goatee-input-editing-mixin)
format-string
&rest format-args)
(let* ((scan-pointer (stream-scan-pointer stream))
(area (area stream))
(buf (buffer area))
(output (apply #'format nil format-string format-args)))
(when (stream-rescanning-p stream)
(return-from input-editor-format nil))
(multiple-value-bind (line pos)
(location*-offset buf scan-pointer)
(let ((extent (make-instance 'noise-extent
:start-line line :start-pos pos)))
(with-point (buf)
(insert buf output :line line :pos pos))
(setf (start-state extent) :open)
(setf (end-state extent) :open)
(setf (stream-scan-pointer stream)
(offset-location* buf
(line (bp-end extent))
(pos (bp-end extent))))
(make-input-editing-stream-snapshot stream area)
(redisplay-area area))))
nil)
(defmethod redraw-input-buffer ((stream goatee-input-editing-mixin) &optional (start-position 0))
(declare (ignore start-position))
(redisplay-area (area stream)))
(defmethod erase-input-buffer ((stream goatee-input-editing-mixin)
&optional (start-position 0))
(declare (ignore start-position))
(clear-output-record (area stream)))
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