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

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date Mon, 13 Aug 2007 08:45:50 +0200
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1 ;;; lisp.el --- Lisp editing commands for XEmacs
2
3 ;; Copyright (C) 1985, 1986, 1994 Free Software Foundation, Inc.
4
5 ;; Maintainer: FSF
6 ;; Keywords: lisp, languages
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 ;; Lisp editing commands to go with Lisp major mode.
29
30 ;;; Code:
31
32 ;; Note that this variable is used by non-lisp modes too.
33 (defvar defun-prompt-regexp nil
34 "*Non-nil => regexp to ignore, before the character that starts a defun.
35 This is only necessary if the opening paren or brace is not in column 0.
36 See `beginning-of-defun'.")
37 (make-variable-buffer-local 'defun-prompt-regexp)
38
39 (defvar parens-require-spaces t
40 "Non-nil => `insert-parentheses' should insert whitespace as needed.")
41
42 (defun forward-sexp (&optional arg)
43 "Move forward across one balanced expression (sexp).
44 With argument, do it that many times.
45 Negative arg -N means move backward across N balanced expressions."
46 (interactive "_p")
47 (or arg (setq arg 1))
48 ;; #### evil hack! The other half of the evil hack below.
49 (if (and (> arg 0) (looking-at "#s("))
50 (goto-char (+ (point) 2)))
51 (goto-char (or (scan-sexps (point) arg) (buffer-end arg)))
52 (if (< arg 0) (backward-prefix-chars))
53 ;; #### evil hack! Skip back over #s so that structures are read properly.
54 ;; the current cheesified syntax tables just aren't up to this.
55 (if (and (< arg 0)
56 (eq (char-after (point)) ?\()
57 (>= (- (point) (point-min)) 2)
58 (eq (char-after (- (point) 1)) ?s)
59 (eq (char-after (- (point) 2)) ?#))
60 (goto-char (- (point) 2))))
61
62 (defun backward-sexp (&optional arg)
63 "Move backward across one balanced expression (sexp).
64 With argument, do it that many times.
65 Negative arg -N means move forward across N balanced expressions."
66 (interactive "_p")
67 (or arg (setq arg 1))
68 (forward-sexp (- arg)))
69
70 (defun mark-sexp (arg)
71 "Set mark ARG sexps from point.
72 The place mark goes is the same place \\[forward-sexp] would move to
73 with the same argument.
74 Repeat this command to mark more sexps in the same direction."
75 (interactive "p")
76 (mark-something 'mark-sexp 'forward-sexp arg))
77
78 (defun forward-list (&optional arg)
79 "Move forward across one balanced group of parentheses.
80 With argument, do it that many times.
81 Negative arg -N means move backward across N groups of parentheses."
82 (interactive "_p")
83 (or arg (setq arg 1))
84 (goto-char (or (scan-lists (point) arg 0) (buffer-end arg))))
85
86 (defun backward-list (&optional arg)
87 "Move backward across one balanced group of parentheses.
88 With argument, do it that many times.
89 Negative arg -N means move forward across N groups of parentheses."
90 (interactive "_p")
91 (or arg (setq arg 1))
92 (forward-list (- arg)))
93
94 (defun down-list (arg)
95 "Move forward down one level of parentheses.
96 With argument, do this that many times.
97 A negative argument means move backward but still go down a level.
98 In Lisp programs, an argument is required."
99 (interactive "_p")
100 (let ((inc (if (> arg 0) 1 -1)))
101 (while (/= arg 0)
102 (goto-char (or (scan-lists (point) inc -1) (buffer-end arg)))
103 (setq arg (- arg inc)))))
104
105 (defun backward-up-list (arg)
106 "Move backward out of one level of parentheses.
107 With argument, do this that many times.
108 A negative argument means move forward but still to a less deep spot.
109 In Lisp programs, an argument is required."
110 (interactive "p")
111 (up-list (- arg)))
112
113 (defun up-list (arg)
114 "Move forward out of one level of parentheses.
115 With argument, do this that many times.
116 A negative argument means move backward but still to a less deep spot.
117 In Lisp programs, an argument is required."
118 (interactive "_p")
119 (let ((inc (if (> arg 0) 1 -1)))
120 (while (/= arg 0)
121 (goto-char (or (scan-lists (point) inc 1) (buffer-end arg)))
122 (setq arg (- arg inc)))))
123
124 (defun kill-sexp (arg)
125 "Kill the sexp (balanced expression) following the cursor.
126 With argument, kill that many sexps after the cursor.
127 Negative arg -N means kill N sexps before the cursor."
128 (interactive "p")
129 (let ((opoint (point)))
130 (forward-sexp arg)
131 (kill-region opoint (point))))
132
133 (defun backward-kill-sexp (arg)
134 "Kill the sexp (balanced expression) preceding the cursor.
135 With argument, kill that many sexps before the cursor.
136 Negative arg -N means kill N sexps after the cursor."
137 (interactive "p")
138 (kill-sexp (- arg)))
139
140 (defun beginning-of-defun (&optional arg)
141 "Move backward to the beginning of a defun.
142 With argument, do it that many times. Negative arg -N
143 means move forward to Nth following beginning of defun.
144 Returns t unless search stops due to beginning or end of buffer.
145
146 Normally a defun starts when there is an char with open-parenthesis
147 syntax at the beginning of a line. If `defun-prompt-regexp' is
148 non-nil, then a string which matches that regexp may precede the
149 open-parenthesis, and point ends up at the beginning of the line."
150 (interactive "_p")
151 (and (beginning-of-defun-raw arg)
152 (progn (beginning-of-line) t)))
153
154 (defun beginning-of-defun-raw (&optional arg)
155 "Move point to the character that starts a defun.
156 This is identical to beginning-of-defun, except that point does not move
157 to the beginning of the line when `defun-prompt-regexp' is non-nil."
158 (interactive "p")
159 (and arg (< arg 0) (not (eobp)) (forward-char 1))
160 (and (re-search-backward (if defun-prompt-regexp
161 (concat "^\\s(\\|"
162 "\\(" defun-prompt-regexp "\\)\\s(")
163 "^\\s(")
164 nil 'move (or arg 1))
165 (progn (goto-char (1- (match-end 0)))) t))
166
167 (defun buffer-end (arg &optional buffer)
168 "Return `point-max' of BUFFER if ARG is > 0; return `point-min' otherwise.
169 BUFFER defaults to the current buffer if omitted."
170 (if (> arg 0) (point-max buffer) (point-min buffer)))
171
172 (defun end-of-defun (&optional arg)
173 "Move forward to next end of defun. With argument, do it that many times.
174 Negative argument -N means move back to Nth preceding end of defun.
175
176 An end of a defun occurs right after the close-parenthesis that matches
177 the open-parenthesis that starts a defun; see `beginning-of-defun'."
178 (interactive "_p")
179 (if (or (null arg) (= arg 0)) (setq arg 1))
180 (let ((first t))
181 (while (and (> arg 0) (< (point) (point-max)))
182 (let ((pos (point)))
183 (while (progn
184 (if (and first
185 (progn
186 (end-of-line 1)
187 (beginning-of-defun-raw 1)))
188 nil
189 (or (bobp) (forward-char -1))
190 (beginning-of-defun-raw -1))
191 (setq first nil)
192 (forward-list 1)
193 (skip-chars-forward " \t")
194 (if (looking-at "\\s<\\|\n")
195 (forward-line 1))
196 (<= (point) pos))))
197 (setq arg (1- arg)))
198 (while (< arg 0)
199 (let ((pos (point)))
200 (beginning-of-defun-raw 1)
201 (forward-sexp 1)
202 (forward-line 1)
203 (if (>= (point) pos)
204 (if (beginning-of-defun-raw 2)
205 (progn
206 (forward-list 1)
207 (skip-chars-forward " \t")
208 (if (looking-at "\\s<\\|\n")
209 (forward-line 1)))
210 (goto-char (point-min)))))
211 (setq arg (1+ arg)))))
212
213 (defun mark-defun ()
214 "Put mark at end of this defun, point at beginning.
215 The defun marked is the one that contains point or follows point."
216 (interactive)
217 (push-mark (point))
218 (end-of-defun)
219 (push-mark (point) nil t)
220 (beginning-of-defun)
221 (re-search-backward "^\n" (- (point) 1) t))
222
223 (defun insert-parentheses (arg)
224 "Put parentheses around next ARG sexps. Leave point after open-paren.
225 No argument is equivalent to zero: just insert `()' and leave point between.
226 If `parens-require-spaces' is non-nil, this command also inserts a space
227 before and after, depending on the surrounding characters."
228 (interactive "P")
229 (if arg (setq arg (prefix-numeric-value arg))
230 (setq arg 0))
231 (or (eq arg 0) (skip-chars-forward " \t"))
232 (and parens-require-spaces
233 (not (bobp))
234 (memq (char-syntax (preceding-char)) '(?w ?_ ?\) ))
235 (insert " "))
236 (insert ?\()
237 (save-excursion
238 (or (eq arg 0) (forward-sexp arg))
239 (insert ?\))
240 (and parens-require-spaces
241 (not (eobp))
242 (memq (char-syntax (following-char)) '(?w ?_ ?\( ))
243 (insert " "))))
244
245 (defun move-past-close-and-reindent ()
246 "Move past next `)', delete indentation before it, then indent after it."
247 (interactive)
248 (up-list 1)
249 (forward-char -1)
250 (while (save-excursion ; this is my contribution
251 (let ((before-paren (point)))
252 (back-to-indentation)
253 (= (point) before-paren)))
254 (delete-indentation))
255 (forward-char 1)
256 (newline-and-indent))
257
258 (defun lisp-complete-symbol ()
259 "Perform completion on Lisp symbol preceding point.
260 That symbol is compared against the symbols that exist
261 and any additional characters determined by what is there
262 are inserted.
263 If the symbol starts just after an open-parenthesis,
264 only symbols with function definitions are considered.
265 Otherwise, all symbols with function definitions, values
266 or properties are considered."
267 (interactive)
268 (let* ((end (point))
269 (buffer-syntax (syntax-table))
270 (beg (unwind-protect
271 (save-excursion
272 (if emacs-lisp-mode-syntax-table
273 (set-syntax-table emacs-lisp-mode-syntax-table))
274 (backward-sexp 1)
275 (while (= (char-syntax (following-char)) ?\')
276 (forward-char 1))
277 (point))
278 (set-syntax-table buffer-syntax)))
279 (pattern (buffer-substring beg end))
280 (predicate
281 (if (eq (char-after (1- beg)) ?\()
282 'fboundp
283 #'(lambda (sym)
284 (or (boundp sym) (fboundp sym)
285 (symbol-plist sym)))))
286 (completion (try-completion pattern obarray predicate)))
287 (cond ((eq completion t))
288 ((null completion)
289 (message "Can't find completion for \"%s\"" pattern)
290 (ding))
291 ((not (string= pattern completion))
292 (delete-region beg end)
293 (insert completion))
294 (t
295 (message "Making completion list...")
296 (let ((list (all-completions pattern obarray predicate))
297 ;FSFmacs crock unnecessary in XEmacs
298 ;see minibuf.el
299 ;(completion-fixup-function
300 ; #'(lambda () (if (save-excursion
301 ; (goto-char (max (point-min)
302 ; (- (point) 4)))
303 ; (looking-at " <f>"))
304 ; (forward-char -4))))
305 )
306 (or (eq predicate 'fboundp)
307 (let (new)
308 (while list
309 (setq new (cons (if (fboundp (intern (car list)))
310 (list (car list) " <f>")
311 (car list))
312 new))
313 (setq list (cdr list)))
314 (setq list (nreverse new))))
315 (with-output-to-temp-buffer "*Completions*"
316 (display-completion-list list)))
317 (message "Making completion list...done")))))
318
319 ;;; lisp.el ends here