/usr/share/common-lisp/source/mcclim/Goatee/editable-buffer.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)
;;; An editable-buffer implements the semantics one would expect of an
;;; Emacs buffer. It maintains a point, where insertions and
;;; deletions take place, and provides functions to move the point around.
(defclass editable-buffer (extent-buffer-mixin basic-buffer-mixin)
((point :accessor point :documentation "A buffer-pointer that
maintains the current insertion point.")
(buffer-start :accessor buffer-start
:documentation "A fixed buffer pointer at the start of the buffer.")
(buffer-end :accessor buffer-end
:documentation "A buffer pointer at the end of the buffer.")))
(defmethod initialize-instance :after ((obj editable-buffer)
&key initial-contents
(start 0)
(end (when initial-contents
(length initial-contents))))
(setf (point obj) (make-instance 'buffer-pointer
:line (dbl-head (lines obj))
:pos 0))
(setf (buffer-start obj) (make-instance 'fixed-buffer-pointer
:line (dbl-head (lines obj))
:pos 0))
(setf (buffer-end obj) (make-instance 'buffer-pointer
:line (dbl-head (lines obj))
:pos 0))
(when initial-contents
(insert obj initial-contents :start start :end end)))
;;; A moment of convenience, a lifetime of regret...
(defmethod point* ((buf editable-buffer))
(let ((point (point buf)))
(values (line point) (pos point))))
(defgeneric* (setf point*) (line pos buffer))
(defmethod* (setf point*) (line pos (buf editable-buffer))
(let ((point (slot-value buf 'point)))
;; If there's a next line, the point can't be moved past the
;; newline at the end of the line.
(when (or (> pos (line-last-point line))
(< pos 0))
(error 'buffer-bounds-error :buffer buf :line line :pos pos))
(when (not (eq (line point) line))
(setf (tick line) (incf (tick buf))))
(setf (location* point) (values line pos))
(setf (tick (line point)) (incf (tick buf)))
(values line pos)))
(defmacro with-point ((buffer) &body body)
"Saves and restores the point of buffer around body."
(let ((bp-var (gensym "BP"))
(buffer-var (gensym "BUFFER")))
`(let ((,buffer-var ,buffer))
(with-buffer-pointer (,bp-var (point ,buffer-var))
(unwind-protect
(progn
,@body)
(setf (location* (point ,buffer-var)) (location* ,bp-var)))))))
;;; Insert is the convenience function; thing can contain newline(s).
(defmethod insert ((buffer editable-buffer) (c character)
&key position line (pos 0))
(cond (position
(setf (point* buffer) (location* position)))
(line
(setf (point* buffer) (values line pos))))
(let* ((pt (slot-value buffer 'point))
(line (line pt))
(pos (pos pt)))
;; point is updated by bp-buffer-mixin methods.
(if (eql c (newline-character buffer))
(buffer-open-line* buffer line pos)
(buffer-insert* buffer c line pos))))
(defmethod insert ((buffer editable-buffer) (s string)
&key position line (pos 0) (start 0) (end (length s)))
(cond (position
(setf (point* buffer) (location* position)))
(line
(setf (point* buffer) (values line pos))))
(multiple-value-bind (line pos)
(point* buffer)
(loop
with newline-character = (newline-character buffer)
for search-start = start then (1+ found-newline)
for found-newline = (position newline-character s
:start search-start
:end end)
while found-newline
do (progn
(setf (values line pos)
(buffer-insert* buffer s line pos
:start search-start
:end found-newline))
(setf (values line pos) (buffer-open-line* buffer line pos)))
finally (return (buffer-insert* buffer s line pos
:start search-start :end end)))))
(defmethod delete-char ((buf editable-buffer) &optional (n 1)
&key position line (pos 0))
(cond (position
(setf (point* buf) (location* position)))
(line
(setf (point* buf) (values line pos))))
(multiple-value-bind (line pos)
(point* buf)
(if (>= n 0)
(loop with remaining = n
for last-point = (line-last-point line)
while (> (+ remaining pos) last-point)
do (let ((del-chars (- last-point pos)))
(when (> del-chars 0)
(buffer-delete-char* buf line pos (1- del-chars)))
;; Up against the end, this should signal an error
(setf (values line pos) (buffer-close-line* buf line 1))
(decf remaining (1+ del-chars)))
finally (return (buffer-delete-char* buf line pos remaining)))
(loop with remaining = (- n)
while (< (- pos remaining) 0)
do (progn
(buffer-delete-char* buf line pos (- pos))
(decf remaining (1+ pos))
(setf (values line pos)
(buffer-close-line* buf line -1)))
finally (return
(buffer-delete-char* buf line pos (- remaining)))))))
(defun adjust-fill (array new-fill)
(if (> new-fill (car (array-dimensions array)))
(adjust-array array new-fill :fill-pointer new-fill)
(setf (fill-pointer array) new-fill))
array)
(defgeneric buffer-string (buffer &key start end))
(defmethod buffer-string ((buf basic-buffer) &key start end result)
(declare (ignore start end))
(let ((result (if result
(adjust-fill result (size buf))
(make-string (size buf)))))
(loop for line-in-string = 0 then (+ line-in-string (size line))
for line = (dbl-head (lines buf)) then (next line)
while line
do (flexivector-string-into line result :start1 line-in-string))
result))
(defmethod forward-char* ((buf editable-buffer) n
&key (position (point buf)) line (pos 0))
(multiple-value-bind (line pos)
(if line
(values line pos)
(location* position))
(if (>= n 0)
(loop with remaining = n
for current-line = line then (next current-line)
for current-pos = pos then 0
for last-point = (or (and current-line
(line-last-point current-line))
0)
until (or (null current-line)
(<= remaining (- last-point current-pos)))
do (decf remaining (max 1 (- last-point current-pos)))
finally (if (null current-line)
(error 'buffer-bounds-error :buffer buf)
(return (values current-line
(+ current-pos remaining)))))
(loop for current-line = line then (and (typep (prev current-line)
'dbl-list)
(prev current-line))
for last-point = (or (and current-line
(line-last-point current-line))
0)
;; previous current-pos
for remaining = (- n) then (- remaining current-pos 1)
for current-pos = pos then last-point
until (or (null current-line) (<= remaining current-pos))
finally (if (null current-line)
(error 'buffer-bounds-error :buffer buf)
(return (values current-line
(- current-pos remaining))))))))
(defmethod forward-char ((buf basic-buffer) n &rest key-args)
(multiple-value-bind (new-line new-pos)
(apply #'forward-char* buf n key-args)
(make-instance 'location :line new-line :pos new-pos)))
(defgeneric end-of-line* (buffer &key position line pos))
(defgeneric end-of-line (buffer &rest key-args))
(defmethod end-of-line* ((buf editable-buffer)
&key (position (point buf)) line (pos 0))
(multiple-value-bind (line pos)
(if line
(values line pos)
(location* position))
(declare (ignore pos))
(values line (line-last-point line))))
(defmethod end-of-line ((buf editable-buffer) &rest key-args)
(multiple-value-bind (new-line new-pos)
(apply #'end-of-line* buf key-args)
(make-instance 'location :line new-line :pos new-pos)))
(defgeneric beginning-of-line* (buffer &key position line pos))
(defmethod beginning-of-line* ((buf editable-buffer)
&key (position (point buf)) line (pos 0))
(multiple-value-bind (line pos)
(if line
(values line pos)
(location* position))
(declare (ignore pos))
(values line 0)))
(defmethod beginning-of-buffer* ((buf editable-buffer))
(location* (buffer-start buf)))
(defmethod end-of-buffer* ((buf editable-buffer))
(location* (buffer-end buf)))
(defgeneric next-line (buffer &optional n &key position line pos)
(:documentation "Return the line N lines from LINE, and a POS in it.
If LINE is not given, uses the BUFFER's current line.
If N is negative, goes backwards.
POS is the position in the line to return as the second value (trimmed
if beyond the actual line's maximum)."))
(defmethod next-line ((buf editable-buffer) &optional (n 1)
&key (position (point buf)) line (pos 0))
(let ((line (or line (location* position)))
(forward (> n 0))
(times (abs n)))
(loop for i upto times
for cur-line = line then (if forward (next line) (prev line))
when (or (not (typep cur-line 'buffer-line)) (null cur-line))
do (error 'buffer-bounds-error :buffer buf :line line)
finally
(return (values cur-line (min pos (line-last-point cur-line)))))))
;;; These iteration constructs need a bit more thought.
;;; map-over-region in its current state may not do the right thing if
;;; the buffer is modified in the region, but what is the right thing?
;;; Behave as if we're moving a point?
(defun map-over-region (func buf start end)
(multiple-value-bind (line pos)
(location* start)
(loop until (and (eq line (line end)) (eql pos (pos end)))
do (progn
(funcall func line pos)
(setf (values line pos)
(forward-char* buf 1 :line line :pos pos))))))
;;; This is cheesy, but I don't feel like optimizing the delete right now.
;; antifuchs->Moore: is this more optimized? What was the extents
;; stuff you hinted at?
;; Had to fix a bug here - would always delete to the end of line, even if
;; start/end was a region within one line. Hopefully didn't screw anything up.
;; --Hefner
(defun delete-region (buf start end)
(if (eql (line start) (line end))
(buffer-delete-char* buf (line start) (pos start)
(- (pos end) (pos start)))
(progn
(buffer-delete-char* buf (line start) (pos start)
(- (line-last-point (line start)) (pos start)))
;; didn't test this piece of code very well...
(loop until (eql (line start) (line end))
do (progn
(buffer-close-line* buf (line start) 1)
(buffer-delete-char* buf (line start) (pos start)
(- (line-last-point (line start))
(pos start)))))
(buffer-delete-char* buf (line start) (pos start) (pos end)))))
(defmethod clear-buffer ((buf editable-buffer))
(delete-region buf (buffer-start buf) (buffer-end buf))
(setf (extents (line (buffer-start buf))) nil))
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