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0907bf08 | 1 | ;;; cplus-md.el --- C++ code editing commands for Emacs |
ee3b8d4d | 2 | ;;; Copyright (C) 1985, 1992 Free Software Foundation, Inc. |
c0274f38 | 3 | |
ee3b8d4d | 4 | ;; This file is part of GNU Emacs. |
3a801d0c | 5 | |
ee3b8d4d RS |
6 | ;; GNU Emacs is free software; you can redistribute it and/or modify |
7 | ;; it under the terms of the GNU General Public License as published by | |
8 | ;; the Free Software Foundation; either version 2, or (at your option) | |
9 | ;; any later version. | |
10 | ||
11 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
12 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | ;; GNU General Public License for more details. | |
15 | ||
16 | ;; You should have received a copy of the GNU General Public License | |
17 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
18 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
07168830 | 19 | ;; Maintainer: Dave Detlefs <dld@cs.cmu.edu> |
07168830 ER |
20 | ;; Keywords: c |
21 | ||
22 | ;;; Commentary: | |
23 | ||
e41b2db1 ER |
24 | ;; 1987 Dave Detlefs <dld@cs.cmu.edu> |
25 | ;; and Stewart Clamen <clamen@cs.cmu.edu>. | |
745bc783 | 26 | ;; Done by fairly faithful modification of: |
e41b2db1 | 27 | |
07168830 ER |
28 | ;;; Change Log: |
29 | ||
745bc783 JB |
30 | ;; Feb, 1990 (Dave Detlefs, dld@cs.cmu.edu) |
31 | ;; Fixed electric-c++-terminator to handle double colons, at the | |
32 | ;; request of John Hagerman. | |
33 | ;; | |
34 | ;; Jan, 1990 (Doug Lea, dl@oswego.edu) | |
35 | ;; Replaced c++-comment-region and c++-uncomment-region with | |
36 | ;; versions from Igor Metz that avoid potential infinite loops. | |
37 | ;; | |
38 | ;; Oct, 1989 (Dave Detlefs, dld@cs.cmu.edu) | |
39 | ;; Added contribution from Igor Metz <metz@iam.unibe.ch>: | |
40 | ;; functions c++-comment-region and c++-uncomment-region and | |
41 | ;; corresponding key-binding. | |
42 | ;; Also fixed bug in indentation of second line after an empty | |
43 | ;; arglist with empty-arglist non-null. | |
44 | ;; | |
45 | ;; Sept, 1989 (Glen Ditchfield, gjditchfield@violet.uwaterloo.ca): | |
46 | ;; Textual changes to more closely imitate Emacs 18.55's c-mode. | |
47 | ;; Fixed handling of "default:", where ":" was the last character in the | |
48 | ;; buffer. Fixed indentation of comments starting in column 0, and when | |
49 | ;; previous line contained more than one comment start string. Fixed | |
50 | ;; handling of "friend class". | |
51 | ;; | |
52 | ;; Aug 7, 1989; John Hagerman (hagerman@ece.cmu.edu): | |
53 | ;; Changed calculate-c++-indent to handle member initializations | |
54 | ;; more flexibly. Two new variables are used to control behavior: | |
55 | ;; c++-member-init-indent and c++-continued-member-init-offset. | |
56 | ;; Note the assumption that member initializations and argument | |
57 | ;; declarations are not mixed in one function definition. | |
58 | ;; | |
59 | ;; June 1989 (Dave Detlefs, dld@cs.cmu.edu) | |
60 | ;; Fixed calculate-c++-indent to handle continued lines ending in | |
61 | ;; {'s. (I wasn't following C-mode closely enough, or C-mode | |
62 | ;; changed.) Made ' a quote character, at the behest of someone | |
63 | ;; whose mail I apparently deleted (if they send me mail I'll credit | |
64 | ;; them here in a future revision.) | |
65 | ;; Dan Weinreb (dlw@odi.com) pointed out that 'c++-mode successively | |
66 | ;; bound c++-indent-exp and c++-indent-defun to ESC-^q. ESC-^q is | |
67 | ;; now bound to c++-indent-exp, while, c++-indent-defun is invoked | |
68 | ;; with ESC-^x. | |
69 | ||
70 | ;; February 1989 (Dave Detlefs, dld@cs.cmu.edu) | |
71 | ;; Fixed some errors in c++-indent-defun, as pointed out by Sam | |
72 | ;; Haradhvala (odi!sam@talcott.harvard.edu). | |
73 | ;; October 1988 (Dave Detlefs, dld@cs.cmu.edu) | |
74 | ;; It turns out I had only *thought* I had made | |
75 | ;; beginning(end)-of-defun work. It should work better now -- you | |
76 | ;; can either attempt to match defun headers "strongly," using a | |
77 | ;; very complicated regexp, or "weakly," using a simple one. This | |
78 | ;; is settable by a variable; the default is the cheaper weak | |
79 | ;; method. (Stewart Clamen was intimately involved in this, too.) | |
80 | ;; | |
81 | ;; I made "'" *not* be a string delimiter, because that was causing | |
82 | ;; comments containing contractions to ("// don't") to mess up paren | |
83 | ;; balancing. | |
84 | ;; | |
85 | ;; I also incorporated another slight indentation fix from Glen | |
86 | ;; Ditchfield. | |
87 | ;; | |
88 | ;; We hope this is will make into version 19 of gnu-emacs. | |
89 | ;; | |
90 | ;; September 1988: incorporated changes from Fred Calm at Schlumberger. | |
91 | ;; Also, made beginning(end)-of-defun, indent-defun work. | |
92 | ;; | |
93 | ;; August 1987: incorporated changes done by Glen Ditchfield of Waterloo. | |
94 | ||
07168830 ER |
95 | ;;; Code: |
96 | ||
745bc783 JB |
97 | (defvar c++-mode-abbrev-table nil |
98 | "Abbrev table used in C++ mode.") | |
99 | (define-abbrev-table 'c++-mode-abbrev-table ()) | |
100 | ||
101 | (defvar c++-mode-map () | |
102 | "Keymap used in C++ mode.") | |
103 | (if c++-mode-map | |
104 | () | |
105 | (setq c++-mode-map (make-sparse-keymap)) | |
106 | (define-key c++-mode-map "\C-j" 'reindent-then-newline-and-indent) | |
107 | (define-key c++-mode-map "{" 'electric-c++-brace) | |
108 | (define-key c++-mode-map "}" 'electric-c++-brace) | |
109 | (define-key c++-mode-map ";" 'electric-c++-semi) | |
110 | (define-key c++-mode-map "\e\C-h" 'mark-c-function) | |
111 | (define-key c++-mode-map "\e\C-q" 'indent-c++-exp) | |
112 | (define-key c++-mode-map "\177" 'backward-delete-char-untabify) | |
113 | (define-key c++-mode-map "\t" 'c++-indent-command) | |
3a801d0c | 114 | ;; (define-key c++-mode-map "\C-c\C-i" 'c++-insert-header) |
e6dfdce5 | 115 | (define-key c++-mode-map "\C-c\C-\\" 'c-backslash-region)) |
3a801d0c ER |
116 | ;; (define-key c++-mode-map "\e\C-a" 'c++-beginning-of-defun) |
117 | ;; (define-key c++-mode-map "\e\C-e" 'c++-end-of-defun) | |
118 | ;; (define-key c++-mode-map "\e\C-x" 'c++-indent-defun)) | |
745bc783 JB |
119 | |
120 | (defvar c++-mode-syntax-table nil | |
121 | "Syntax table used in C++ mode.") | |
122 | ||
123 | (if c++-mode-syntax-table | |
124 | () | |
125 | (setq c++-mode-syntax-table (copy-syntax-table c-mode-syntax-table)) | |
126 | (modify-syntax-entry ?/ ". 12" c++-mode-syntax-table) | |
127 | (modify-syntax-entry ?\n ">" c++-mode-syntax-table) | |
128 | (modify-syntax-entry ?\' "." c++-mode-syntax-table)) | |
129 | ||
130 | (defvar c++-continued-member-init-offset nil | |
131 | "*Extra indent for continuation lines of member inits; | |
3a801d0c | 132 | nil means to align with previous initializations rather than |
745bc783 JB |
133 | with the colon on the first line.") |
134 | (defvar c++-member-init-indent 0 | |
135 | "*Indentation level of member initializations in function declarations.") | |
136 | (defvar c++-friend-offset -4 | |
137 | "*Offset of C++ friend class declarations relative to member declarations.") | |
138 | (defvar c++-electric-colon t | |
139 | "*If t, colon is an electric terminator.") | |
140 | (defvar c++-empty-arglist-indent nil | |
141 | "*Indicates how far to indent an line following an empty argument | |
142 | list. Nil indicates to just after the paren.") | |
143 | ||
144 | ||
145 | ;;;###autoload | |
146 | (defun c++-mode () | |
147 | "Major mode for editing C++ code. Very much like editing C code. | |
148 | Expression and list commands understand all C++ brackets. | |
149 | Tab at left margin indents for C++ code | |
150 | Comments are delimited with /* ... */ {or with // ... <newline>} | |
151 | Paragraphs are separated by blank lines only. | |
152 | Delete converts tabs to spaces as it moves back. | |
153 | \\{c++-mode-map} | |
154 | Variables controlling indentation style: | |
155 | c-tab-always-indent | |
156 | Non-nil means TAB in C mode should always reindent the current line, | |
157 | regardless of where in the line point is when the TAB command is used. | |
158 | Default is t. | |
159 | c-auto-newline | |
160 | Non-nil means automatically newline before and after braces, | |
161 | and after colons and semicolons, inserted in C code. | |
162 | c-indent-level | |
163 | Indentation of C statements within surrounding block. | |
164 | The surrounding block's indentation is the indentation | |
165 | of the line on which the open-brace appears. | |
166 | c-continued-statement-offset | |
167 | Extra indentation given to a substatement, such as the | |
168 | then-clause of an if or body of a while. | |
169 | c-continued-brace-offset | |
170 | Extra indentation given to a brace that starts a substatement. | |
171 | This is in addition to c-continued-statement-offset. | |
172 | c-brace-offset | |
173 | Extra indentation for line if it starts with an open brace. | |
174 | c-brace-imaginary-offset | |
175 | An open brace following other text is treated as if it were | |
176 | this far to the right of the start of its line. | |
177 | c-argdecl-indent | |
178 | Indentation level of declarations of C function arguments. | |
179 | c-label-offset | |
180 | Extra indentation for line that is a label, or case or ``default:'', or | |
181 | ``public:'' or ``private:'', or ``protected:''. | |
182 | c++-electric-colon | |
183 | If non-nil at invocation of c++-mode (t is the default) colon electricly | |
184 | indents. | |
185 | c++-empty-arglist-indent | |
186 | If non-nil, a function declaration or invocation which ends a line with a | |
187 | left paren is indented this many extra spaces, instead of flush with the | |
188 | left paren. | |
189 | c++-friend-offset | |
190 | Offset of C++ friend class declarations relative to member declarations. | |
191 | c++-member-init-indent | |
192 | Indentation level of member initializations in function declarations, | |
193 | if they are on a separate line beginning with a colon. | |
194 | c++-continued-member-init-offset | |
195 | Extra indentation for continuation lines of member initializations; NIL | |
196 | means to align with previous initializations rather than with the colon. | |
197 | ||
198 | Settings for K&R, BSD, and Stroustrup indentation styles are | |
199 | c-indent-level 5 8 4 | |
200 | c-continued-statement-offset 5 8 4 | |
201 | c-continued-brace-offset 0 | |
202 | c-brace-offset -5 -8 0 | |
203 | c-brace-imaginary-offset 0 | |
204 | c-argdecl-indent 0 8 4 | |
205 | c-label-offset -5 -8 -4 | |
206 | c++-empty-arglist-indent 4 | |
207 | c++-friend-offset 0 | |
208 | ||
209 | Turning on C++ mode calls the value of the variable `c++-mode-hook' with | |
210 | no args if that value is non-nil." | |
211 | (interactive) | |
212 | (kill-all-local-variables) | |
213 | (use-local-map c++-mode-map) | |
214 | (set-syntax-table c++-mode-syntax-table) | |
215 | (setq major-mode 'c++-mode | |
216 | mode-name "C++" | |
217 | comment-column 32 | |
218 | local-abbrev-table c++-mode-abbrev-table) | |
219 | (set (make-local-variable 'indent-line-function) 'c++-indent-line) | |
220 | (set (make-local-variable 'comment-start) "// ") | |
221 | (set (make-local-variable 'comment-end) "") | |
222 | (set (make-local-variable 'comment-start-skip) "/\\*+ *\\|// *") | |
e41b2db1 | 223 | (set (make-local-variable 'comment-indent-function) 'c++-comment-indent) |
745bc783 JB |
224 | (set (make-local-variable 'paragraph-start) (concat "^$\\|" page-delimiter)) |
225 | (set (make-local-variable 'paragraph-separate) paragraph-start) | |
226 | (set (make-local-variable 'paragraph-ignore-fill-prefix) t) | |
227 | (set (make-local-variable 'require-final-newline) t) | |
228 | (set (make-local-variable 'parse-sexp-ignore-comments) nil) | |
229 | (run-hooks 'c++-mode-hook) | |
230 | (if c++-electric-colon | |
231 | (define-key c++-mode-map ":" 'electric-c++-terminator))) | |
232 | ||
233 | ;; This is used by indent-for-comment | |
234 | ;; to decide how much to indent a comment in C++ code | |
235 | ;; based on its context. | |
236 | (defun c++-comment-indent () | |
237 | (if (looking-at "^\\(/\\*\\|//\\)") | |
238 | 0 ; Existing comment at bol stays there. | |
239 | (save-excursion | |
240 | (skip-chars-backward " \t") | |
241 | (max | |
242 | ;; leave at least one space on non-empty lines. | |
243 | (if (zerop (current-column)) 0 (1+ (current-column))) | |
244 | (let ((cur-pt (point))) | |
245 | (beginning-of-line 0) | |
246 | ;; If previous line had a comment, use it's indent | |
247 | (if (re-search-forward comment-start-skip cur-pt t) | |
248 | (progn | |
249 | (goto-char (match-beginning 0)) | |
250 | (current-column)) | |
251 | comment-column)))))) ; otherwise indent at comment column. | |
252 | ||
253 | (defun electric-c++-brace (arg) | |
254 | "Insert character and correct line's indentation." | |
255 | (interactive "P") | |
256 | (let (insertpos) | |
257 | (if (and (not arg) | |
258 | (eolp) | |
259 | (or (save-excursion | |
260 | (skip-chars-backward " \t") | |
261 | (bolp)) | |
262 | (if c-auto-newline (progn (c++-indent-line) (newline) t)))) | |
263 | (progn | |
264 | (insert last-command-char) | |
265 | (c++-indent-line) | |
266 | (if c-auto-newline | |
267 | (progn | |
268 | (newline) | |
269 | ;; (newline) may have done auto-fill | |
270 | (setq insertpos (- (point) 2)) | |
271 | (c++-indent-line))) | |
272 | (save-excursion | |
273 | (if insertpos (goto-char (1+ insertpos))) | |
274 | (delete-char -1)))) | |
275 | (if insertpos | |
276 | (save-excursion | |
277 | (goto-char insertpos) | |
278 | (self-insert-command (prefix-numeric-value arg))) | |
279 | (self-insert-command (prefix-numeric-value arg))))) | |
280 | ||
281 | (defun electric-c++-semi (arg) | |
282 | "Insert character and correct line's indentation." | |
283 | (interactive "P") | |
284 | (if c-auto-newline | |
285 | (electric-c++-terminator arg) | |
286 | (self-insert-command (prefix-numeric-value arg)))) | |
287 | ||
288 | (defun electric-c++-terminator (arg) | |
289 | "Insert character and correct line's indentation." | |
290 | (interactive "P") | |
291 | (let (insertpos (end (point))) | |
292 | (if (and (not arg) (eolp) | |
293 | (not (save-excursion | |
294 | (beginning-of-line) | |
295 | (skip-chars-forward " \t") | |
296 | (or (= (following-char) ?#) | |
297 | ;; Colon is special only after a label, or | |
298 | ;; case, or another colon. | |
299 | ;; So quickly rule out most other uses of colon | |
300 | ;; and do no indentation for them. | |
301 | (and (eq last-command-char ?:) | |
302 | (not (looking-at "case[ \t]")) | |
303 | (save-excursion | |
304 | (forward-word 1) | |
305 | (skip-chars-forward " \t") | |
306 | (< (point) end)) | |
307 | ;; Do re-indent double colons | |
308 | (save-excursion | |
309 | (end-of-line 1) | |
310 | (looking-at ":"))) | |
311 | (progn | |
312 | (beginning-of-defun) | |
313 | (let ((pps (parse-partial-sexp (point) end))) | |
314 | (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))))) | |
315 | (progn | |
316 | (insert last-command-char) | |
317 | (c++-indent-line) | |
318 | (and c-auto-newline | |
319 | (not (c-inside-parens-p)) | |
320 | (progn | |
321 | ;; the new marker object, used to be just an integer | |
322 | (setq insertpos (make-marker)) | |
323 | ;; changed setq to set-marker | |
324 | (set-marker insertpos (1- (point))) | |
325 | ;; do this before the newline, since in auto fill can break | |
326 | (newline) | |
327 | (c-indent-line))) | |
328 | (save-excursion | |
329 | (if insertpos (goto-char (1+ insertpos))) | |
330 | (delete-char -1)))) | |
331 | (if insertpos | |
332 | (save-excursion | |
333 | (goto-char insertpos) | |
334 | (self-insert-command (prefix-numeric-value arg))) | |
335 | (self-insert-command (prefix-numeric-value arg))))) | |
336 | ||
337 | (defun c++-indent-command (&optional whole-exp) | |
338 | "Indent current line as C++ code, or in some cases insert a tab character. | |
339 | If `c-tab-always-indent' is non-nil (the default), always indent current | |
340 | line. Otherwise, indent the current line only if point is at the left | |
341 | margin or in the line's indentation; otherwise insert a tab. | |
342 | ||
343 | A numeric argument, regardless of its value, means indent rigidly all means | |
344 | indent rigidly all the lines of the expression starting after point so that | |
345 | this line becomes properly indented. The relative indentation among the | |
346 | lines of the expression are preserved." | |
347 | (interactive "P") | |
348 | (if whole-exp | |
349 | ;; If arg, always indent this line as C | |
350 | ;; and shift remaining lines of expression the same amount. | |
351 | (let ((shift-amt (c++-indent-line)) | |
352 | beg end) | |
353 | (save-excursion | |
354 | (if c-tab-always-indent | |
355 | (beginning-of-line)) | |
356 | (setq beg (point)) | |
357 | (forward-sexp 1) | |
358 | (setq end (point)) | |
359 | (goto-char beg) | |
360 | (forward-line 1) | |
361 | (setq beg (point))) | |
362 | (if (> end beg) | |
363 | (indent-code-rigidly beg end shift-amt "#"))) | |
364 | (if (and (not c-tab-always-indent) | |
365 | (save-excursion | |
366 | (skip-chars-backward " \t") | |
367 | (not (bolp)))) | |
368 | (insert-tab) | |
369 | (c++-indent-line)))) | |
370 | ||
371 | (defun c++-indent-line () | |
372 | "Indent current line as C++ code. | |
373 | Return the amount the indentation changed by." | |
374 | (let ((indent (calculate-c++-indent nil)) | |
375 | beg shift-amt | |
376 | (case-fold-search nil) | |
377 | (pos (- (point-max) (point)))) | |
378 | (beginning-of-line) | |
379 | (setq beg (point)) | |
380 | (cond ((eq indent nil) | |
381 | (setq indent (current-indentation))) | |
382 | ((eq indent t) | |
383 | (setq indent (calculate-c-indent-within-comment))) | |
384 | ((looking-at "[ \t]*#") | |
385 | (setq indent 0)) | |
386 | (t | |
387 | (skip-chars-forward " \t") | |
388 | (if (listp indent) (setq indent (car indent))) | |
389 | (cond ((looking-at "\\(default\\|public\\|private\\|protected\\):") | |
390 | (setq indent (+ indent c-label-offset))) | |
391 | ((or (looking-at "case\\b") | |
392 | (and (looking-at "[A-Za-z]") | |
393 | (save-excursion | |
394 | (forward-sexp 1) | |
395 | (looking-at ":[^:]")))) | |
396 | (setq indent (max 1 (+ indent c-label-offset)))) | |
397 | ((and (looking-at "else\\b") | |
398 | (not (looking-at "else\\s_"))) | |
399 | (setq indent (save-excursion | |
400 | (c-backward-to-start-of-if) | |
401 | (current-indentation)))) | |
402 | ((looking-at "friend\[ \t]class[ \t]") | |
403 | (setq indent (+ indent c++-friend-offset))) | |
404 | ((= (following-char) ?}) | |
405 | (setq indent (- indent c-indent-level))) | |
406 | ((= (following-char) ?{) | |
407 | (setq indent (+ indent c-brace-offset)))))) | |
408 | (skip-chars-forward " \t") | |
409 | (setq shift-amt (- indent (current-column))) | |
410 | (if (zerop shift-amt) | |
411 | (if (> (- (point-max) pos) (point)) | |
412 | (goto-char (- (point-max) pos))) | |
413 | (delete-region beg (point)) | |
414 | (indent-to indent) | |
415 | ;; If initial point was within line's indentation, | |
416 | ;; position after the indentation. Else stay at same point in text. | |
417 | (if (> (- (point-max) pos) (point)) | |
418 | (goto-char (- (point-max) pos)))) | |
419 | shift-amt)) | |
420 | ||
421 | (defun calculate-c++-indent (&optional parse-start) | |
422 | "Return appropriate indentation for current line as C++ code. | |
423 | In usual case returns an integer: the column to indent to. | |
424 | Returns nil if line starts inside a string, t if in a comment." | |
425 | (save-excursion | |
426 | (beginning-of-line) | |
427 | (let ((indent-point (point)) | |
428 | (case-fold-search nil) | |
429 | state | |
430 | containing-sexp) | |
431 | (if parse-start | |
432 | (goto-char parse-start) | |
433 | (beginning-of-defun)) | |
434 | (while (< (point) indent-point) | |
435 | (setq parse-start (point)) | |
436 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
437 | (setq containing-sexp (car (cdr state)))) | |
438 | (cond ((or (nth 3 state) (nth 4 state)) | |
439 | ;; return nil or t if should not change this line | |
440 | (nth 4 state)) | |
441 | ((null containing-sexp) | |
442 | ;; Line is at top level. May be data or function definition, or | |
443 | ;; may be function argument declaration or member initialization. | |
444 | ;; Indent like the previous top level line unless | |
445 | ;; (1) the previous line ends in a closeparen without semicolon, | |
446 | ;; in which case this line is the first argument declaration or | |
447 | ;; member initialization, or | |
448 | ;; (2) the previous line begins with a colon, | |
449 | ;; in which case this is the second line of member inits. | |
450 | ;; It is assumed that arg decls and member inits are not mixed. | |
451 | (goto-char indent-point) | |
452 | (skip-chars-forward " \t") | |
453 | (if (= (following-char) ?{) | |
454 | 0 ; Unless it starts a function body | |
455 | (c++-backward-to-noncomment (or parse-start (point-min))) | |
456 | (if (= (preceding-char) ?\)) | |
457 | (progn ; first arg decl or member init | |
458 | (goto-char indent-point) | |
459 | (skip-chars-forward " \t") | |
460 | (if (= (following-char) ?:) | |
461 | c++-member-init-indent | |
462 | c-argdecl-indent)) | |
463 | (if (= (preceding-char) ?\;) | |
464 | (backward-char 1)) | |
465 | (if (= (preceding-char) ?}) | |
466 | 0 | |
467 | (beginning-of-line) ; continued arg decls or member inits | |
468 | (skip-chars-forward " \t") | |
469 | (if (= (following-char) ?:) | |
470 | (if c++-continued-member-init-offset | |
471 | (+ (current-indentation) | |
472 | c++-continued-member-init-offset) | |
473 | (progn | |
474 | (forward-char 1) | |
475 | (skip-chars-forward " \t") | |
476 | (current-column))) | |
477 | (current-indentation))) | |
478 | ))) | |
479 | ((/= (char-after containing-sexp) ?{) | |
480 | ;; line is expression, not statement: | |
481 | ;; indent to just after the surrounding open -- unless | |
482 | ;; empty arg list, in which case we do what | |
483 | ;; c++-empty-arglist-indent says to do. | |
484 | (if (and c++-empty-arglist-indent | |
485 | (or (null (nth 2 state)) ;; indicates empty arg | |
486 | ;; list. | |
487 | ;; Use a heuristic: if the first | |
488 | ;; non-whitespace following left paren on | |
489 | ;; same line is not a comment, | |
490 | ;; is not an empty arglist. | |
491 | (save-excursion | |
492 | (goto-char (1+ containing-sexp)) | |
493 | (not | |
494 | (looking-at "\\( \\|\t\\)*[^/\n]"))))) | |
495 | (progn | |
496 | (goto-char containing-sexp) | |
497 | (beginning-of-line) | |
498 | (skip-chars-forward " \t") | |
499 | (goto-char (min (+ (point) c++-empty-arglist-indent) | |
500 | (1+ containing-sexp))) | |
501 | (current-column)) | |
502 | ;; In C-mode, we would always indent to one after the | |
503 | ;; left paren. Here, though, we may have an | |
504 | ;; empty-arglist, so we'll indent to the min of that | |
505 | ;; and the beginning of the first argument. | |
506 | (goto-char (1+ containing-sexp)) | |
507 | (current-column))) | |
508 | (t | |
509 | ;; Statement. Find previous non-comment character. | |
510 | (goto-char indent-point) | |
511 | (c++-backward-to-noncomment containing-sexp) | |
512 | (if (not (memq (preceding-char) '(nil ?\, ?\; ?} ?: ?\{))) | |
513 | ;; This line is continuation of preceding line's statement; | |
514 | ;; indent c-continued-statement-offset more than the | |
515 | ;; previous line of the statement. | |
516 | (progn | |
517 | (c-backward-to-start-of-continued-exp containing-sexp) | |
dc606f02 RS |
518 | (+ c-continued-statement-offset (current-column) |
519 | (if (save-excursion (goto-char indent-point) | |
520 | (skip-chars-forward " \t") | |
521 | (eq (following-char) ?{)) | |
522 | c-continued-brace-offset 0))) | |
745bc783 JB |
523 | ;; This line starts a new statement. |
524 | ;; Position following last unclosed open. | |
525 | (goto-char containing-sexp) | |
526 | ;; Is line first statement after an open-brace? | |
527 | (or | |
528 | ;; If no, find that first statement and indent like it. | |
529 | (save-excursion | |
530 | (forward-char 1) | |
531 | (while (progn (skip-chars-forward " \t\n") | |
532 | (looking-at | |
533 | (concat | |
534 | "#\\|/\\*\\|//" | |
535 | "\\|case[ \t]" | |
536 | "\\|[a-zA-Z0-9_$]*:[^:]" | |
537 | "\\|friend[ \t]class[ \t]"))) | |
538 | ;; Skip over comments and labels following openbrace. | |
539 | (cond ((= (following-char) ?\#) | |
540 | (forward-line 1)) | |
541 | ((looking-at "/\\*") | |
542 | (search-forward "*/" nil 'move)) | |
543 | ((looking-at "//\\|friend[ \t]class[ \t]") | |
544 | (forward-line 1)) | |
545 | (t | |
546 | (re-search-forward ":[^:]" nil 'move)))) | |
547 | ;; The first following code counts | |
548 | ;; if it is before the line we want to indent. | |
549 | (and (< (point) indent-point) | |
550 | (current-column))) | |
551 | ;; If no previous statement, | |
552 | ;; indent it relative to line brace is on. | |
553 | ;; For open brace in column zero, don't let statement | |
554 | ;; start there too. If c-indent-offset is zero, | |
555 | ;; use c-brace-offset + c-continued-statement-offset instead. | |
556 | ;; For open-braces not the first thing in a line, | |
557 | ;; add in c-brace-imaginary-offset. | |
558 | (+ (if (and (bolp) (zerop c-indent-level)) | |
559 | (+ c-brace-offset c-continued-statement-offset) | |
560 | c-indent-level) | |
561 | ;; Move back over whitespace before the openbrace. | |
562 | ;; If openbrace is not first nonwhite thing on the line, | |
563 | ;; add the c-brace-imaginary-offset. | |
564 | (progn (skip-chars-backward " \t") | |
565 | (if (bolp) 0 c-brace-imaginary-offset)) | |
566 | ;; If the openbrace is preceded by a parenthesized exp, | |
567 | ;; move to the beginning of that; | |
568 | ;; possibly a different line | |
569 | (progn | |
570 | (if (eq (preceding-char) ?\)) | |
571 | (forward-sexp -1)) | |
572 | ;; Get initial indentation of the line we are on. | |
573 | (current-indentation)))))))))) | |
574 | ||
575 | (defun c++-backward-to-noncomment (lim) | |
576 | (let (opoint stop) | |
577 | (while (not stop) | |
578 | (skip-chars-backward " \t\n\r\f" lim) | |
579 | (setq opoint (point)) | |
580 | (cond ((and (>= (point) (+ 2 lim)) | |
581 | (save-excursion | |
582 | (forward-char -2) | |
583 | (looking-at "\\*/"))) | |
584 | (search-backward "/*" lim 'move)) | |
585 | ((and | |
3a801d0c ER |
586 | (search-backward "//" (max (c++-point-bol) lim) 'move) |
587 | (not (c++-within-string-p (point) opoint)))) | |
745bc783 JB |
588 | (t (beginning-of-line) |
589 | (skip-chars-forward " \t") | |
590 | (if (looking-at "#") | |
591 | (setq stop (<= (point) lim)) | |
592 | (setq stop t) | |
593 | (goto-char opoint))))))) | |
594 | ||
595 | (defun indent-c++-exp () | |
596 | "Indent each line of the C++ grouping following point." | |
597 | (interactive) | |
598 | (let ((indent-stack (list nil)) | |
599 | (contain-stack (list (point))) | |
600 | (case-fold-search nil) | |
601 | restart outer-loop-done inner-loop-done state ostate | |
e6dfdce5 | 602 | this-indent last-sexp last-depth |
745bc783 JB |
603 | at-else at-brace |
604 | (opoint (point)) | |
605 | (next-depth 0)) | |
606 | (save-excursion | |
607 | (forward-sexp 1)) | |
608 | (save-excursion | |
609 | (setq outer-loop-done nil) | |
610 | (while (and (not (eobp)) (not outer-loop-done)) | |
611 | (setq last-depth next-depth) | |
612 | ;; Compute how depth changes over this line | |
613 | ;; plus enough other lines to get to one that | |
614 | ;; does not end inside a comment or string. | |
615 | ;; Meanwhile, do appropriate indentation on comment lines. | |
e6dfdce5 RS |
616 | (setq inner-loop-done nil) |
617 | (while (and (not inner-loop-done) | |
745bc783 JB |
618 | (not (and (eobp) (setq outer-loop-done t)))) |
619 | (setq ostate state) | |
620 | (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) | |
621 | nil nil state)) | |
622 | (setq next-depth (car state)) | |
623 | (if (and (car (cdr (cdr state))) | |
624 | (>= (car (cdr (cdr state))) 0)) | |
625 | (setq last-sexp (car (cdr (cdr state))))) | |
626 | (if (or (nth 4 ostate)) | |
627 | (c++-indent-line)) | |
628 | (if (or (nth 3 state)) | |
629 | (forward-line 1) | |
e6dfdce5 | 630 | (setq inner-loop-done t))) |
745bc783 JB |
631 | (if (<= next-depth 0) |
632 | (setq outer-loop-done t)) | |
633 | (if outer-loop-done | |
634 | nil | |
635 | ;; If this line had ..))) (((.. in it, pop out of the levels | |
636 | ;; that ended anywhere in this line, even if the final depth | |
637 | ;; doesn't indicate that they ended. | |
638 | (while (> last-depth (nth 6 state)) | |
639 | (setq indent-stack (cdr indent-stack) | |
640 | contain-stack (cdr contain-stack) | |
641 | last-depth (1- last-depth))) | |
642 | (if (/= last-depth next-depth) | |
643 | (setq last-sexp nil)) | |
644 | ;; Add levels for any parens that were started in this line. | |
645 | (while (< last-depth next-depth) | |
646 | (setq indent-stack (cons nil indent-stack) | |
647 | contain-stack (cons nil contain-stack) | |
648 | last-depth (1+ last-depth))) | |
649 | (if (null (car contain-stack)) | |
650 | (setcar contain-stack (or (car (cdr state)) | |
651 | (save-excursion (forward-sexp -1) | |
652 | (point))))) | |
653 | (forward-line 1) | |
654 | (skip-chars-forward " \t") | |
655 | (if (eolp) | |
656 | nil | |
657 | (if (and (car indent-stack) | |
658 | (>= (car indent-stack) 0)) | |
659 | ;; Line is on an existing nesting level. | |
660 | ;; Lines inside parens are handled specially. | |
3a801d0c | 661 | (if (/= (char-after (car contain-stack)) ?\{) |
745bc783 JB |
662 | (setq this-indent (car indent-stack)) |
663 | ;; Line is at statement level. | |
664 | ;; Is it a new statement? Is it an else? | |
665 | ;; Find last non-comment character before this line | |
666 | (save-excursion | |
667 | (setq at-else (looking-at "else\\W")) | |
3a801d0c | 668 | (setq at-brace (= (following-char) ?\{)) |
745bc783 | 669 | (c++-backward-to-noncomment opoint) |
3a801d0c | 670 | (if (not (memq (preceding-char) '(nil ?\, ?\; ?\} ?: ?\{))) |
745bc783 JB |
671 | ;; Preceding line did not end in comma or semi; |
672 | ;; indent this line c-continued-statement-offset | |
673 | ;; more than previous. | |
674 | (progn | |
675 | (c-backward-to-start-of-continued-exp | |
676 | (car contain-stack)) | |
677 | (setq this-indent | |
678 | (+ c-continued-statement-offset | |
679 | (current-column) | |
680 | (if at-brace c-continued-brace-offset 0)))) | |
681 | ;; Preceding line ended in comma or semi; | |
682 | ;; use the standard indent for this level. | |
683 | (if at-else | |
684 | (progn (c-backward-to-start-of-if opoint) | |
685 | (setq this-indent (current-indentation))) | |
686 | (setq this-indent (car indent-stack)))))) | |
687 | ;; Just started a new nesting level. | |
688 | ;; Compute the standard indent for this level. | |
689 | (let ((val (calculate-c++-indent | |
690 | (if (car indent-stack) | |
691 | (- (car indent-stack)))))) | |
692 | (setcar indent-stack | |
693 | (setq this-indent val)))) | |
694 | ;; Adjust line indentation according to its contents | |
695 | (if (looking-at "\\(public\\|private\\|protected\\):") | |
696 | (setq this-indent (- this-indent c-indent-level))) | |
697 | (if (or (looking-at "case[ \t]") | |
698 | (and (looking-at "[A-Za-z]") | |
699 | (save-excursion | |
700 | (forward-sexp 1) | |
701 | (looking-at ":[^:]")))) | |
702 | (setq this-indent (max 1 (+ this-indent c-label-offset)))) | |
703 | (if (looking-at "friend[ \t]class[ \t]") | |
704 | (setq this-indent (+ this-indent c++-friend-offset))) | |
3a801d0c | 705 | (if (= (following-char) ?\}) |
745bc783 | 706 | (setq this-indent (- this-indent c-indent-level))) |
3a801d0c | 707 | (if (= (following-char) ?\{) |
745bc783 JB |
708 | (setq this-indent (+ this-indent c-brace-offset))) |
709 | ;; Put chosen indentation into effect. | |
710 | (or (= (current-column) this-indent) | |
711 | (= (following-char) ?\#) | |
712 | (progn | |
713 | (delete-region (point) (progn (beginning-of-line) (point))) | |
714 | (indent-to this-indent))) | |
715 | ;; Indent any comment following the text. | |
716 | (or (looking-at comment-start-skip) | |
717 | (if (re-search-forward comment-start-skip | |
718 | (save-excursion (end-of-line) | |
719 | (point)) t) | |
720 | (progn | |
721 | (indent-for-comment) | |
722 | (beginning-of-line)))))))))) | |
3a801d0c ER |
723 | \f |
724 | (defun fill-c++-comment () | |
725 | "Fill a comment contained in consecutive lines containing point. | |
726 | The fill lines remain a comment." | |
745bc783 JB |
727 | (interactive) |
728 | (save-excursion | |
729 | (let ((save fill-prefix)) | |
730 | (beginning-of-line 1) | |
731 | (save-excursion | |
732 | (re-search-forward comment-start-skip | |
733 | (save-excursion (end-of-line) (point)) | |
734 | t) | |
735 | (goto-char (match-end 0)) | |
736 | (set-fill-prefix)) | |
737 | (while (looking-at fill-prefix) | |
738 | (previous-line 1)) | |
739 | (next-line 1) | |
740 | (insert-string "\n") | |
741 | (fill-paragraph nil) | |
742 | (delete-char -1) | |
743 | (setq fill-prefix save)))) | |
744 | ||
3a801d0c | 745 | (defun c++-point-bol () |
745bc783 JB |
746 | "Returns the value of the point at the beginning of the current line." |
747 | (save-excursion | |
748 | (beginning-of-line) | |
749 | (point))) | |
750 | ||
3a801d0c ER |
751 | ;; (defun c++-insert-header () |
752 | ;; "Insert header denoting C++ code at top of buffer." | |
753 | ;; (interactive) | |
754 | ;; (save-excursion | |
755 | ;; (goto-char (point-min)) | |
756 | ;; (insert "// " | |
757 | ;; "This may look like C code, but it is really " | |
758 | ;; "-*- C++ -*-" | |
759 | ;; "\n\n"))) | |
760 | ||
761 | (defun c++-within-string-p (point1 point2) | |
745bc783 JB |
762 | "Returns true if number of double quotes between two points is odd." |
763 | (let ((s (buffer-substring point1 point2))) | |
3a801d0c | 764 | (not (zerop (% (c++-count-char-in-string ?\" s) 2))))) |
745bc783 | 765 | |
3a801d0c | 766 | (defun c++-count-char-in-string (c s) |
745bc783 JB |
767 | (let ((count 0) |
768 | (pos 0)) | |
769 | (while (< pos (length s)) | |
770 | (setq count (+ count (if (\= (aref s pos) c) 1 0))) | |
771 | (setq pos (1+ pos))) | |
772 | count)) | |
773 | \f | |
3a801d0c | 774 | ;; rms: This page is creeping featurism, and not worth having. |
745bc783 | 775 | |
745bc783 JB |
776 | ;;; Below are two regular expressions that attempt to match defuns |
777 | ;;; "strongly" and "weakly." The strong one almost reconstructs the | |
778 | ;;; grammar of C++; the weak one just figures anything id or curly on | |
779 | ;;; the left begins a defun. The constant "c++-match-header-strongly" | |
780 | ;;; determines which to use; the default is the weak one. | |
781 | ||
3a801d0c ER |
782 | ;; (defvar c++-match-header-strongly nil |
783 | ;; "*If nil, use `c++-defun-header-weak' to identify beginning of definitions. | |
784 | ;; If non-nil, use `c++-defun-header-strong'.") | |
785 | ;; | |
786 | ;; (defvar c++-defun-header-strong-struct-equivs "\\(class\\|struct\\|enum\\)" | |
787 | ;; "Regexp to match names of structure declaration blocks in C++.") | |
788 | ;; | |
789 | ;; (defconst c++-defun-header-strong | |
790 | ;; (let* | |
791 | ;; (; valid identifiers | |
eb8c3be9 | 792 | ;; ;; There's a real weirdness here -- if I switch the below |
3a801d0c ER |
793 | ;; (id "\\(\\w\\|_\\)+") |
794 | ;; ;; to be | |
795 | ;; ;; (id "\\(_\\|\\w\\)+") | |
796 | ;; ;; things no longer work right. Try it and see! | |
797 | ;; | |
798 | ;; ; overloadable operators | |
799 | ;; (op-sym1 | |
800 | ;; "[---+*/%^&|~!=<>]\\|[---+*/%^&|<>=!]=\\|<<=?\\|>>=?") | |
801 | ;; (op-sym2 | |
802 | ;; "&&\\|||\\|\\+\\+\\|--\\|()\\|\\[\\]") | |
803 | ;; (op-sym (concat "\\(" op-sym1 "\\|" op-sym2 "\\)")) | |
804 | ;; ; whitespace | |
805 | ;; (middle "[^\\*]*\\(\\*+[^/\\*][^\\*]*\\)*") | |
806 | ;; (c-comment (concat "/\\*" middle "\\*+/")) | |
807 | ;; (wh (concat "\\(\\s \\|\n\\|//.*$\\|" c-comment "\\)")) | |
808 | ;; (wh-opt (concat wh "*")) | |
809 | ;; (wh-nec (concat wh "+")) | |
810 | ;; (oper (concat "\\(" "operator" "\\(" | |
811 | ;; wh-opt op-sym "\\|" wh-nec id "\\)" "\\)")) | |
812 | ;; (dcl-list "([^():]*)") | |
813 | ;; (func-name (concat "\\(" oper "\\|" id "::" id "\\|" id "\\)")) | |
814 | ;; (inits | |
815 | ;; (concat "\\(:" | |
816 | ;; "\\(" wh-opt id "(.*\\()" wh-opt "," "\\)\\)*" | |
817 | ;; wh-opt id "(.*)" wh-opt "{" | |
818 | ;; "\\|" wh-opt "{\\)")) | |
819 | ;; (type-name (concat | |
820 | ;; "\\(" c++-defun-header-strong-struct-equivs wh-nec "\\)?" | |
821 | ;; id)) | |
822 | ;; (type (concat "\\(const" wh-nec "\\)?" | |
823 | ;; "\\(" type-name "\\|" type-name wh-opt "\\*+" "\\|" | |
824 | ;; type-name wh-opt "&" "\\)")) | |
825 | ;; (modifier "\\(inline\\|virtual\\|overload\\|auto\\|static\\)") | |
826 | ;; (modifiers (concat "\\(" modifier wh-nec "\\)*")) | |
827 | ;; (func-header | |
828 | ;; ;; type arg-dcl | |
829 | ;; (concat modifiers type wh-nec func-name wh-opt dcl-list wh-opt inits)) | |
830 | ;; (inherit (concat "\\(:" wh-opt "\\(public\\|private\\)?" | |
831 | ;; wh-nec id "\\)")) | |
832 | ;; (cs-header (concat | |
833 | ;; c++-defun-header-strong-struct-equivs | |
834 | ;; wh-nec id wh-opt inherit "?" wh-opt "{"))) | |
835 | ;; (concat "^\\(" func-header "\\|" cs-header "\\)")) | |
836 | ;; "Strongly-defined regexp to match beginning of structure or function def.") | |
837 | ;; | |
838 | ;; | |
839 | ;; ;; This part has to do with recognizing defuns. | |
840 | ;; | |
841 | ;; ;; The weak convention we will use is that a defun begins any time | |
842 | ;; ;; there is a left curly brace, or some identifier on the left margin, | |
843 | ;; ;; followed by a left curly somewhere on the line. (This will also | |
844 | ;; ;; incorrectly match some continued strings, but this is after all | |
845 | ;; ;; just a weak heuristic.) Suggestions for improvement (short of the | |
846 | ;; ;; strong scheme shown above) are welcomed. | |
847 | ;; | |
848 | ;; (defconst c++-defun-header-weak "^{\\|^[_a-zA-Z].*{" | |
849 | ;; "Weakly-defined regexp to match beginning of structure or function def.") | |
850 | ;; | |
851 | ;; (defun c++-beginning-of-defun (arg) | |
852 | ;; (interactive "p") | |
853 | ;; (let ((c++-defun-header (if c++-match-header-strongly | |
854 | ;; c++-defun-header-strong | |
855 | ;; c++-defun-header-weak))) | |
856 | ;; (cond ((or (= arg 0) (and (> arg 0) (bobp))) nil) | |
857 | ;; ((and (not (looking-at c++-defun-header)) | |
858 | ;; (let ((curr-pos (point)) | |
859 | ;; (open-pos (if (search-forward "{" nil 'move) | |
860 | ;; (point))) | |
861 | ;; (beg-pos | |
862 | ;; (if (re-search-backward c++-defun-header nil 'move) | |
863 | ;; (match-beginning 0)))) | |
864 | ;; (if (and open-pos beg-pos | |
865 | ;; (< beg-pos curr-pos) | |
866 | ;; (> open-pos curr-pos)) | |
867 | ;; (progn | |
868 | ;; (goto-char beg-pos) | |
869 | ;; (if (= arg 1) t nil));; Are we done? | |
870 | ;; (goto-char curr-pos) | |
871 | ;; nil)))) | |
872 | ;; (t | |
873 | ;; (if (and (looking-at c++-defun-header) (not (bobp))) | |
874 | ;; (forward-char (if (< arg 0) 1 -1))) | |
875 | ;; (and (re-search-backward c++-defun-header nil 'move (or arg 1)) | |
876 | ;; (goto-char (match-beginning 0))))))) | |
877 | ;; | |
878 | ;; | |
879 | ;; (defun c++-end-of-defun (arg) | |
880 | ;; (interactive "p") | |
881 | ;; (let ((c++-defun-header (if c++-match-header-strongly | |
882 | ;; c++-defun-header-strong | |
883 | ;; c++-defun-header-weak))) | |
884 | ;; (if (and (eobp) (> arg 0)) | |
885 | ;; nil | |
886 | ;; (if (and (> arg 0) (looking-at c++-defun-header)) (forward-char 1)) | |
887 | ;; (let ((pos (point))) | |
888 | ;; (c++-beginning-of-defun | |
889 | ;; (if (< arg 0) | |
890 | ;; (- (- arg (if (eobp) 0 1))) | |
891 | ;; arg)) | |
892 | ;; (if (and (< arg 0) (bobp)) | |
893 | ;; t | |
894 | ;; (if (re-search-forward c++-defun-header nil 'move) | |
895 | ;; (progn (forward-char -1) | |
896 | ;; (forward-sexp) | |
897 | ;; (beginning-of-line 2))) | |
898 | ;; (if (and (= pos (point)) | |
899 | ;; (re-search-forward c++-defun-header nil 'move)) | |
900 | ;; (c++-end-of-defun 1)))) | |
901 | ;; t))) | |
902 | ;; | |
903 | ;; (defun c++-indent-defun () | |
904 | ;; "Indents the current function definition, struct or class declaration." | |
905 | ;; (interactive) | |
906 | ;; (let ((restore (point))) | |
907 | ;; (c++-end-of-defun 1) | |
908 | ;; (beginning-of-line 1) | |
909 | ;; (let ((end (point))) | |
910 | ;; (c++-beginning-of-defun 1) | |
911 | ;; (while (<= (point) end) | |
912 | ;; (c++-indent-line) | |
913 | ;; (next-line 1) | |
914 | ;; (beginning-of-line 1))) | |
915 | ;; (goto-char restore))) | |
c0274f38 | 916 | |
0907bf08 | 917 | ;;; cplus-md.el ends here |