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comparison lisp/prim/rect.el @ 0:376386a54a3c r19-14

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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; rect.el --- rectangle functions for XEmacs.
2
3 ;; Copyright (C) 1985, 1993, 1994 Free Software Foundation, Inc.
4
5 ;; Maintainer: FSF
6 ;; Keywords: internal
7
8 ;; This file is part of XEmacs.
9
10 ;; XEmacs is free software; you can redistribute it and/or modify it
11 ;; under the terms of the GNU General Public License as published by
12 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; any later version.
14
15 ;; XEmacs is distributed in the hope that it will be useful, but
16 ;; WITHOUT ANY WARRANTY; without even the implied warranty of
17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 ;; General Public License for more details.
19
20 ;; You should have received a copy of the GNU General Public License
21 ;; along with XEmacs; see the file COPYING. If not, write to the Free
22 ;; Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
23
24 ;;; Synched up with: FSF 19.30.
25
26 ;;; Commentary:
27
28 ;; This package provides the operations on rectangles that are ocumented
29 ;; in the XEmacs Reference Manual.
30
31 ;;; Code:
32
33 ;; XEmacs: extra-args
34 (defun operate-on-rectangle (function start end coerce-tabs &rest extra-args)
35 "Call FUNCTION for each line of rectangle with corners at START, END.
36 If COERCE-TABS is non-nil, convert multi-column characters
37 that span the starting or ending columns on any line
38 to multiple spaces before calling FUNCTION.
39 FUNCTION is called with three arguments:
40 position of start of segment of this line within the rectangle,
41 number of columns that belong to rectangle but are before that position,
42 number of columns that belong to rectangle but are after point.
43 Point is at the end of the segment of this line within the rectangle."
44 (let (startcol startlinepos endcol endlinepos)
45 (save-excursion
46 (goto-char start)
47 (setq startcol (current-column))
48 (beginning-of-line)
49 (setq startlinepos (point)))
50 (save-excursion
51 (goto-char end)
52 (setq endcol (current-column))
53 (forward-line 1)
54 (setq endlinepos (point-marker)))
55 (if (< endcol startcol)
56 (let ((tem startcol))
57 (setq startcol endcol endcol tem)))
58 (save-excursion
59 (goto-char startlinepos)
60 (while (< (point) endlinepos)
61 (let (startpos begextra endextra)
62 (move-to-column startcol coerce-tabs)
63 (setq begextra (- (current-column) startcol))
64 (setq startpos (point))
65 (move-to-column endcol coerce-tabs)
66 (setq endextra (- endcol (current-column)))
67 (if (< begextra 0)
68 (setq endextra (+ endextra begextra)
69 begextra 0))
70 (apply function startpos begextra endextra extra-args))
71 (forward-line 1)))
72 (- endcol startcol)))
73
74 (defun delete-rectangle-line (startdelpos ignore ignore)
75 (delete-region startdelpos (point)))
76
77 ;; XEmacs: added lines arg
78 (defun delete-extract-rectangle-line (startdelpos begextra endextra lines)
79 (save-excursion
80 (extract-rectangle-line startdelpos begextra endextra lines))
81 (delete-region startdelpos (point)))
82
83 ;; XEmacs: added lines arg
84 (defun extract-rectangle-line (startdelpos begextra endextra lines)
85 (let ((line (buffer-substring startdelpos (point)))
86 (end (point)))
87 (goto-char startdelpos)
88 (while (search-forward "\t" end t)
89 (let ((width (- (current-column)
90 (save-excursion (forward-char -1)
91 (current-column)))))
92 (setq line (concat (substring line 0 (- (point) end 1))
93 (spaces-string width)
94 (substring line (+ (length line) (- (point) end)))))))
95 (if (or (> begextra 0) (> endextra 0))
96 (setq line (concat (spaces-string begextra)
97 line
98 (spaces-string endextra))))
99 (setcdr lines (cons line (cdr lines)))))
100
101 (defconst spaces-strings
102 (purecopy '["" " " " " " " " " " " " " " " " "]))
103
104 (defun spaces-string (n)
105 (if (<= n 8) (aref spaces-strings n)
106 (let ((val ""))
107 (while (> n 8)
108 (setq val (concat " " val)
109 n (- n 8)))
110 (concat val (aref spaces-strings n)))))
111
112 ;;;###autoload
113 (defun delete-rectangle (start end)
114 "Delete (don't save) text in rectangle with point and mark as corners.
115 The same range of columns is deleted in each line
116 starting with the line where the region begins
117 and ending with the line where the region ends."
118 (interactive "r")
119 (operate-on-rectangle 'delete-rectangle-line start end t))
120
121 ;;;###autoload
122 (defun delete-extract-rectangle (start end)
123 "Delete contents of rectangle and return it as a list of strings.
124 Arguments START and END are the corners of the rectangle.
125 The value is list of strings, one for each line of the rectangle."
126 (let ((lines (list nil))) ; XEmacs change
127 (operate-on-rectangle 'delete-extract-rectangle-line
128 start end t lines)
129 (nreverse (cdr lines))))
130
131 ;;;###autoload
132 (defun extract-rectangle (start end)
133 "Return contents of rectangle with corners at START and END.
134 Value is list of strings, one for each line of the rectangle."
135 (let ((lines (list nil))) ; XEmacs change
136 (operate-on-rectangle 'extract-rectangle-line start end nil lines)
137 (nreverse (cdr lines))))
138
139 ;;;###autoload
140 (defvar killed-rectangle nil
141 "Rectangle for yank-rectangle to insert.")
142
143 ;;;###autoload
144 (defun kill-rectangle (start end)
145 "Delete rectangle with corners at point and mark; save as last killed one.
146 Calling from program, supply two args START and END, buffer positions.
147 But in programs you might prefer to use `delete-extract-rectangle'."
148 (interactive "r")
149 (if buffer-read-only
150 (progn
151 (setq killed-rectangle (extract-rectangle start end))
152 (barf-if-buffer-read-only)))
153 (setq killed-rectangle (delete-extract-rectangle start end)))
154
155 ;;;###autoload
156 (defun yank-rectangle ()
157 "Yank the last killed rectangle with upper left corner at point."
158 (interactive)
159 (insert-rectangle killed-rectangle))
160
161 ;;;###autoload
162 (defun insert-rectangle (rectangle)
163 "Insert text of RECTANGLE with upper left corner at point.
164 RECTANGLE's first line is inserted at point,
165 its second line is inserted at a point vertically under point, etc.
166 RECTANGLE should be a list of strings.
167 After this command, the mark is at the upper left corner
168 and point is at the lower right corner."
169 (let ((lines rectangle)
170 (insertcolumn (current-column))
171 (first t))
172 (push-mark)
173 (while lines
174 (or first
175 (progn
176 (forward-line 1)
177 (or (bolp) (insert ?\n))
178 (move-to-column insertcolumn t)))
179 (setq first nil)
180 (insert (car lines))
181 (setq lines (cdr lines)))))
182
183 ;;;###autoload
184 (defun open-rectangle (start end)
185 "Blank out rectangle with corners at point and mark, shifting text right.
186 The text previously in the region is not overwritten by the blanks,
187 but instead winds up to the right of the rectangle."
188 (interactive "r")
189 (operate-on-rectangle 'open-rectangle-line start end nil)
190 (goto-char start))
191
192 (defun open-rectangle-line (startpos begextra endextra)
193 ;; Column where rectangle ends.
194 (let ((endcol (+ (current-column) endextra))
195 whitewidth)
196 (goto-char startpos)
197 ;; Column where rectangle begins.
198 (let ((begcol (- (current-column) begextra)))
199 (skip-chars-forward " \t")
200 ;; Width of whitespace to be deleted and recreated.
201 (setq whitewidth (- (current-column) begcol)))
202 ;; Delete the whitespace following the start column.
203 (delete-region startpos (point))
204 ;; Open the desired width, plus same amount of whitespace we just deleted.
205 (indent-to (+ endcol whitewidth))))
206
207 ;;;###autoload
208 (defun string-rectangle (start end string)
209 "Insert STRING on each line of the region-rectangle, shifting text right.
210 The left edge of the rectangle specifies the column for insertion.
211 This command does not delete or overwrite any existing text.
212
213 Called from a program, takes three args; START, END and STRING."
214 (interactive "r\nsString rectangle: ")
215 (operate-on-rectangle 'string-rectangle-line start end t string))
216
217 ;; XEmacs: add string arg
218 (defun string-rectangle-line (startpos begextra endextra string)
219 (let (whitespace)
220 (goto-char startpos)
221 ;; Compute horizontal width of following whitespace.
222 (let ((ocol (current-column)))
223 (skip-chars-forward " \t")
224 (setq whitespace (- (current-column) ocol)))
225 ;; Delete the following whitespace.
226 (delete-region startpos (point))
227 ;; Insert the desired string.
228 (insert string)
229 ;; Insert the same width of whitespace that we had before.
230 (indent-to (+ (current-column) whitespace))))
231
232 ;;;###autoload
233 (defun clear-rectangle (start end)
234 "Blank out rectangle with corners at point and mark.
235 The text previously in the region is overwritten by the blanks.
236 When called from a program, requires two args which specify the corners."
237 (interactive "r")
238 (operate-on-rectangle 'clear-rectangle-line start end t))
239
240 (defun clear-rectangle-line (startpos begextra endextra)
241 ;; Find end of whitespace after the rectangle.
242 (skip-chars-forward " \t")
243 (let ((column (+ (current-column) endextra)))
244 ;; Delete the text in the rectangle, and following whitespace.
245 (delete-region (point)
246 (progn (goto-char startpos)
247 (skip-chars-backward " \t")
248 (point)))
249 ;; Reindent out to same column that we were at.
250 (indent-to column)))
251
252 ;(defun rectangle-coerce-tab (column)
253 ; (let ((aftercol (current-column))
254 ; (indent-tabs-mode nil))
255 ; (delete-char -1)
256 ; (indent-to aftercol)
257 ; (backward-char (- aftercol column))))
258
259 (provide 'rect)
260
261 ;;; rect.el ends here