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authorStefan Monnier2000-12-11 21:34:11 +0000
committerStefan Monnier2000-12-11 21:34:11 +0000
commitd0c679bc851f71e011390a5f80dc52869781d771 (patch)
tree437577099cb7893bbdacb46f748be9e8441f84aa /lisp/progmodes
parenta3642e49097db87eb3144b61c5e2bda6c011d13c (diff)
downloademacs-d0c679bc851f71e011390a5f80dc52869781d771.tar.gz
emacs-d0c679bc851f71e011390a5f80dc52869781d771.zip
Moved from progmodes/c-mode.el to obsolete/c-mode.el
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diff --git a/lisp/progmodes/c-mode.el b/lisp/progmodes/c-mode.el
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1;;; c-mode.el --- C code editing commands for Emacs
2
3;; Copyright (C) 1985, 86, 87, 92, 94, 95 Free Software Foundation, Inc.
4
5;; Maintainer: FSF
6;; Keywords: c
7
8;; This file is part of GNU Emacs.
9
10;; GNU Emacs is free software; you can redistribute it and/or modify
11;; it 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;; GNU Emacs is distributed in the hope that it will be useful,
16;; but WITHOUT ANY WARRANTY; without even the implied warranty of
17;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18;; GNU General Public License for more details.
19
20;; You should have received a copy of the GNU General Public License
21;; along with GNU Emacs; see the file COPYING. If not, write to the
22;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23;; Boston, MA 02111-1307, USA.
24
25;;; Commentary:
26
27;; A smart editing mode for C code. It knows a lot about C syntax and tries
28;; to position the cursor according to C layout conventions. You can
29;; change the details of the layout style with option variables. Load it
30;; and do M-x describe-mode for details.
31
32;;; Code:
33(defgroup old-c nil
34 "Old C code editing commands for Emacs."
35 ;; This group should have no parent.
36 ;; We don't want it to be loaded except on explicit request.
37 :prefix "c-")
38
39
40(defvar c-mode-abbrev-table nil
41 "Abbrev table in use in C mode.")
42(define-abbrev-table 'c-mode-abbrev-table ())
43
44(defvar c-mode-map (make-sparse-keymap)
45 "Keymap used in C mode.")
46
47(define-key c-mode-map "{" 'electric-c-brace)
48(define-key c-mode-map "}" 'electric-c-brace)
49(define-key c-mode-map ";" 'electric-c-semi)
50(define-key c-mode-map "#" 'electric-c-sharp-sign)
51(define-key c-mode-map ":" 'electric-c-terminator)
52(define-key c-mode-map "\e\C-h" 'mark-c-function)
53(define-key c-mode-map "\e\C-q" 'indent-c-exp)
54(define-key c-mode-map "\ea" 'c-beginning-of-statement)
55(define-key c-mode-map "\ee" 'c-end-of-statement)
56(define-key c-mode-map "\C-c\C-n" 'c-forward-conditional)
57(define-key c-mode-map "\C-c\C-p" 'c-backward-conditional)
58(define-key c-mode-map "\C-c\C-u" 'c-up-conditional)
59(define-key c-mode-map "\177" 'backward-delete-char-untabify)
60(define-key c-mode-map "\t" 'c-indent-command)
61
62(define-key c-mode-map [menu-bar] (make-sparse-keymap))
63
64;; "C-mode" is not strictly the right punctuation--it should be "C
65;; mode"--but that would look like two menu items. "C-mode" is the
66;; best alternative I can think of.
67(define-key c-mode-map [menu-bar c]
68 (cons "C-mode" (make-sparse-keymap "C-mode")))
69
70(define-key c-mode-map [menu-bar c comment-region]
71 '("Comment Out Region" . comment-region))
72(define-key c-mode-map [menu-bar c c-macro-expand]
73 '("Macro Expand Region" . c-macro-expand))
74(define-key c-mode-map [menu-bar c c-backslash-region]
75 '("Backslashify" . c-backslash-region))
76(define-key c-mode-map [menu-bar c indent-exp]
77 '("Indent Expression" . indent-c-exp))
78(define-key c-mode-map [menu-bar c indent-line]
79 '("Indent Line" . c-indent-command))
80(define-key c-mode-map [menu-bar c fill]
81 '("Fill Comment Paragraph" . c-fill-paragraph))
82(define-key c-mode-map [menu-bar c cpp-highlight-buffer]
83 '("Highlight Conditionals" . cpp-highlight-buffer))
84(define-key c-mode-map [menu-bar c up]
85 '("Up Conditional" . c-up-conditional))
86(define-key c-mode-map [menu-bar c backward]
87 '("Backward Conditional" . c-backward-conditional))
88(define-key c-mode-map [menu-bar c forward]
89 '("Forward Conditional" . c-forward-conditional))
90(define-key c-mode-map [menu-bar c backward-stmt]
91 '("Backward Statement" . c-beginning-of-statement))
92(define-key c-mode-map [menu-bar c forward-stmt]
93 '("Forward Statement" . c-end-of-statement))
94
95(put 'comment-region 'menu-enable 'mark-active)
96(put 'c-macro-expand 'menu-enable 'mark-active)
97(put 'c-backslash-region 'menu-enable 'mark-active)
98
99(autoload 'c-macro-expand "cmacexp"
100 "Display the result of expanding all C macros occurring in the region.
101The expansion is entirely correct because it uses the C preprocessor."
102 t)
103
104(defvar c-mode-syntax-table nil
105 "Syntax table in use in C-mode buffers.")
106
107(if c-mode-syntax-table
108 ()
109 (setq c-mode-syntax-table (make-syntax-table))
110 (modify-syntax-entry ?\\ "\\" c-mode-syntax-table)
111 (modify-syntax-entry ?/ ". 14" c-mode-syntax-table)
112 (modify-syntax-entry ?* ". 23" c-mode-syntax-table)
113 (modify-syntax-entry ?+ "." c-mode-syntax-table)
114 (modify-syntax-entry ?- "." c-mode-syntax-table)
115 (modify-syntax-entry ?= "." c-mode-syntax-table)
116 (modify-syntax-entry ?% "." c-mode-syntax-table)
117 (modify-syntax-entry ?< "." c-mode-syntax-table)
118 (modify-syntax-entry ?> "." c-mode-syntax-table)
119 (modify-syntax-entry ?& "." c-mode-syntax-table)
120 (modify-syntax-entry ?| "." c-mode-syntax-table)
121 (modify-syntax-entry ?\' "\"" c-mode-syntax-table))
122
123(defcustom c-indent-level 2
124 "*Indentation of C statements with respect to containing block."
125 :type 'integer
126 :group 'old-c)
127(defcustom c-brace-imaginary-offset 0
128 "*Imagined indentation of a C open brace that actually follows a statement."
129 :type 'integer
130 :group 'old-c)
131(defcustom c-brace-offset 0
132 "*Extra indentation for braces, compared with other text in same context."
133 :type 'integer
134 :group 'old-c)
135(defcustom c-argdecl-indent 5
136 "*Indentation level of declarations of C function arguments."
137 :type 'integer
138 :group 'old-c)
139(defcustom c-label-offset -2
140 "*Offset of C label lines and case statements relative to usual indentation."
141 :type 'integer
142 :group 'old-c)
143(defcustom c-continued-statement-offset 2
144 "*Extra indent for lines not starting new statements."
145 :type 'integer
146 :group 'old-c)
147(defcustom c-continued-brace-offset 0
148 "*Extra indent for substatements that start with open-braces.
149This is in addition to `c-continued-statement-offset'."
150 :type 'integer
151 :group 'old-c)
152(defconst c-style-alist
153 '(("GNU"
154 (c-indent-level . 2)
155 (c-argdecl-indent . 5)
156 (c-brace-offset . 0)
157 (c-continued-brace-offset . 0)
158 (c-label-offset . -2)
159 (c-continued-statement-offset . 2))
160 ("K&R"
161 (c-indent-level . 5)
162 (c-argdecl-indent . 0)
163 (c-brace-offset . 0)
164 (c-continued-brace-offset . -5)
165 (c-label-offset . -5)
166 (c-continued-statement-offset . 5))
167 ("BSD"
168 (c-indent-level . 4)
169 (c-argdecl-indent . 4)
170 (c-brace-offset . 0)
171 (c-continued-brace-offset . -4)
172 (c-label-offset . -4)
173 (c-continued-statement-offset . 4))
174 ("C++"
175 (c-indent-level . 4)
176 (c-argdecl-indent . 0)
177 (c-brace-offset . 0)
178 (c-continued-brace-offset . -4)
179 (c-label-offset . -4)
180 (c-continued-statement-offset . 4)
181 (c-auto-newline . t))
182 ("Whitesmith"
183 (c-indent-level . 4)
184 (c-argdecl-indent . 4)
185 (c-brace-offset . 0)
186 (c-continued-brace-offset . 0)
187 (c-label-offset . -4)
188 (c-continued-statement-offset . 4))))
189
190(defcustom c-auto-newline nil
191 "*Non-nil means automatically newline before and after braces,
192and after colons and semicolons, inserted in C code.
193If you do not want a leading newline before braces then use:
194 (define-key c-mode-map \"{\" 'electric-c-semi)"
195 :type 'boolean
196 :group 'old-c)
197
198(defcustom c-tab-always-indent t
199 "*Non-nil means TAB in C mode should always reindent the current line,
200regardless of where in the line point is when the TAB command is used."
201 :type 'boolean
202 :group 'old-c)
203
204;;; Regular expression used internally to recognize labels in switch
205;;; statements.
206(defconst c-switch-label-regexp "case[ \t'/(]\\|default[ \t]*:")
207
208;; This is actually the expression for C++ mode, but it's used for C too.
209(defvar c-imenu-generic-expression
210 (`
211 ((nil
212 (,
213 (concat
214 "^" ; beginning of line is required
215 "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
216 "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no
217 "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right?
218
219 "\\(" ; last type spec including */&
220 "[a-zA-Z0-9_:]+"
221 "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace
222 "\\)?" ; if there is a last type spec
223 "\\(" ; name; take that into the imenu entry
224 "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor...
225 ; (may not contain * because then
226 ; "a::operator char*" would become "char*"!)
227 "\\|"
228 "\\([a-zA-Z0-9_:~]*::\\)?operator"
229 "[^a-zA-Z1-9_][^(]*" ; ...or operator
230 " \\)"
231 "[ \t]*([^)]*)[ \t\n]*[^ ;]" ; require something other than a ; after
232 ; the (...) to avoid prototypes. Can't
233 ; catch cases with () inside the parentheses
234 ; surrounding the parameters
235 ; (like "int foo(int a=bar()) {...}"
236
237 )) 6)
238 ("Class"
239 (, (concat
240 "^" ; beginning of line is required
241 "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
242 "class[ \t]+"
243 "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
244 "[ \t]*[:{]"
245 )) 2)
246;; Example of generic expression for finding prototypes, structs, unions, enums.
247;; Uncomment if you want to find these too. It will be a bit slower gathering
248;; the indexes.
249; ("Prototypes"
250; (,
251; (concat
252; "^" ; beginning of line is required
253; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
254; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no
255; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right?
256
257; "\\(" ; last type spec including */&
258; "[a-zA-Z0-9_:]+"
259; "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace
260; "\\)?" ; if there is a last type spec
261; "\\(" ; name; take that into the imenu entry
262; "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor...
263; ; (may not contain * because then
264; ; "a::operator char*" would become "char*"!)
265; "\\|"
266; "\\([a-zA-Z0-9_:~]*::\\)?operator"
267; "[^a-zA-Z1-9_][^(]*" ; ...or operator
268; " \\)"
269; "[ \t]*([^)]*)[ \t\n]*;" ; require ';' after
270; ; the (...) Can't
271; ; catch cases with () inside the parentheses
272; ; surrounding the parameters
273; ; (like "int foo(int a=bar());"
274; )) 6)
275; ("Struct"
276; (, (concat
277; "^" ; beginning of line is required
278; "\\(static[ \t]+\\)?" ; there may be static or const.
279; "\\(const[ \t]+\\)?"
280; "struct[ \t]+"
281; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
282; "[ \t]*[{]"
283; )) 3)
284; ("Enum"
285; (, (concat
286; "^" ; beginning of line is required
287; "\\(static[ \t]+\\)?" ; there may be static or const.
288; "\\(const[ \t]+\\)?"
289; "enum[ \t]+"
290; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
291; "[ \t]*[{]"
292; )) 3)
293; ("Union"
294; (, (concat
295; "^" ; beginning of line is required
296; "\\(static[ \t]+\\)?" ; there may be static or const.
297; "\\(const[ \t]+\\)?"
298; "union[ \t]+"
299; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
300; "[ \t]*[{]"
301; )) 3)
302 ))
303 "Imenu generic expression for C mode. See `imenu-generic-expression'.")
304
305(defun c-mode ()
306 "Major mode for editing C code.
307Expression and list commands understand all C brackets.
308Tab indents for C code.
309Comments are delimited with /* ... */.
310Paragraphs are separated by blank lines only.
311Delete converts tabs to spaces as it moves back.
312\\{c-mode-map}
313Variables controlling indentation style:
314 c-tab-always-indent
315 Non-nil means TAB in C mode should always reindent the current line,
316 regardless of where in the line point is when the TAB command is used.
317 c-auto-newline
318 Non-nil means automatically newline before and after braces,
319 and after colons and semicolons, inserted in C code.
320 c-indent-level
321 Indentation of C statements within surrounding block.
322 The surrounding block's indentation is the indentation
323 of the line on which the open-brace appears.
324 c-continued-statement-offset
325 Extra indentation given to a substatement, such as the
326 then-clause of an if or body of a while.
327 c-continued-brace-offset
328 Extra indentation given to a brace that starts a substatement.
329 This is in addition to c-continued-statement-offset.
330 c-brace-offset
331 Extra indentation for line if it starts with an open brace.
332 c-brace-imaginary-offset
333 An open brace following other text is treated as if it were
334 this far to the right of the start of its line.
335 c-argdecl-indent
336 Indentation level of declarations of C function arguments.
337 c-label-offset
338 Extra indentation for line that is a label, or case or default.
339
340Settings for K&R and BSD indentation styles are
341 c-indent-level 5 8
342 c-continued-statement-offset 5 8
343 c-brace-offset -5 -8
344 c-argdecl-indent 0 8
345 c-label-offset -5 -8
346
347Turning on C mode calls the value of the variable c-mode-hook with no args,
348if that value is non-nil."
349 (interactive)
350 (kill-all-local-variables)
351 (use-local-map c-mode-map)
352 (setq major-mode 'c-mode)
353 (setq mode-name "C")
354 (setq local-abbrev-table c-mode-abbrev-table)
355 (set-syntax-table c-mode-syntax-table)
356 (make-local-variable 'paragraph-start)
357 (setq paragraph-start (concat "$\\|" page-delimiter))
358 (make-local-variable 'paragraph-separate)
359 (setq paragraph-separate paragraph-start)
360 (make-local-variable 'paragraph-ignore-fill-prefix)
361 (setq paragraph-ignore-fill-prefix t)
362 (make-local-variable 'fill-paragraph-function)
363 (setq fill-paragraph-function 'c-fill-paragraph)
364 (make-local-variable 'indent-line-function)
365 (setq indent-line-function 'c-indent-line)
366 (make-local-variable 'indent-region-function)
367 (setq indent-region-function 'c-indent-region)
368 (make-local-variable 'require-final-newline)
369 (setq require-final-newline t)
370 (make-local-variable 'outline-regexp)
371 (setq outline-regexp "[^#\n\^M]")
372 (make-local-variable 'outline-level)
373 (setq outline-level 'c-outline-level)
374 (make-local-variable 'comment-start)
375 (setq comment-start "/* ")
376 (make-local-variable 'comment-end)
377 (setq comment-end " */")
378 (make-local-variable 'comment-start-skip)
379 (setq comment-start-skip "/\\*+ *")
380 (make-local-variable 'comment-indent-function)
381 (setq comment-indent-function 'c-comment-indent)
382 (make-local-variable 'comment-multi-line)
383 (setq comment-multi-line t)
384 (make-local-variable 'parse-sexp-ignore-comments)
385 (setq parse-sexp-ignore-comments t)
386 (make-local-variable 'imenu-generic-expression)
387 (setq imenu-generic-expression c-imenu-generic-expression)
388 (setq imenu-case-fold-search nil)
389 (run-hooks 'c-mode-hook))
390
391(defun c-outline-level ()
392 ;; This so that `current-column' DTRT in otherwise-hidden text.
393 (let (buffer-invisibility-spec)
394 (save-excursion
395 (skip-chars-forward "\t ")
396 (current-column))))
397
398;; This is used by indent-for-comment
399;; to decide how much to indent a comment in C code
400;; based on its context.
401(defun c-comment-indent ()
402 (if (looking-at "^/\\*")
403 0 ;Existing comment at bol stays there.
404 (let ((opoint (point)))
405 (save-excursion
406 (beginning-of-line)
407 (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)")
408 ;; A comment following a solitary close-brace
409 ;; should have only one space.
410 (search-forward "}")
411 (1+ (current-column)))
412 ((or (looking-at "^#[ \t]*endif[ \t]*")
413 (looking-at "^#[ \t]*else[ \t]*"))
414 7) ;2 spaces after #endif
415 ((progn
416 (goto-char opoint)
417 (skip-chars-backward " \t")
418 (and (= comment-column 0) (bolp)))
419 ;; If comment-column is 0, and nothing but space
420 ;; before the comment, align it at 0 rather than 1.
421 0)
422 (t
423 (max (1+ (current-column)) ;Else indent at comment column
424 comment-column))))))) ; except leave at least one space.
425
426(defun c-fill-paragraph (&optional arg)
427 "Like \\[fill-paragraph] but handle C comments.
428If any of the current line is a comment or within a comment,
429fill the comment or the paragraph of it that point is in,
430preserving the comment indentation or line-starting decorations."
431 (interactive "P")
432 (let* (comment-start-place
433 (first-line
434 ;; Check for obvious entry to comment.
435 (save-excursion
436 (beginning-of-line)
437 (skip-chars-forward " \t\n")
438 (and (looking-at comment-start-skip)
439 (setq comment-start-place (point))))))
440 (if (and (eq major-mode 'c++-mode)
441 (save-excursion
442 (beginning-of-line)
443 (looking-at ".*//")))
444 (let (fill-prefix
445 (paragraph-start
446 ;; Lines containing just a comment start or just an end
447 ;; should not be filled into paragraphs they are next to.
448 (concat
449 paragraph-start
450 "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))
451 (paragraph-separate
452 (concat
453 paragraph-separate
454 "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")))
455 (save-excursion
456 (beginning-of-line)
457 ;; Move up to first line of this comment.
458 (while (and (not (bobp)) (looking-at "[ \t]*//"))
459 (forward-line -1))
460 (if (not (looking-at ".*//"))
461 (forward-line 1))
462 ;; Find the comment start in this line.
463 (re-search-forward "[ \t]*//[ \t]*")
464 ;; Set the fill-prefix to be what all lines except the first
465 ;; should start with.
466 (let ((endcol (current-column)))
467 (skip-chars-backward " \t")
468 (setq fill-prefix
469 (concat (make-string (- (current-column) 2) ?\ )
470 "//"
471 (make-string (- endcol (current-column)) ?\ ))))
472 (save-restriction
473 ;; Narrow down to just the lines of this comment.
474 (narrow-to-region (point)
475 (save-excursion
476 (forward-line 1)
477 (while (looking-at "[ \t]*//")
478 (forward-line 1))
479 (point)))
480 (insert fill-prefix)
481 (fill-paragraph arg)
482 (delete-region (point-min)
483 (+ (point-min) (length fill-prefix))))))
484 (if (or first-line
485 ;; t if we enter a comment between start of function and this line.
486 (eq (calculate-c-indent) t)
487 ;; t if this line contains a comment starter.
488 (setq first-line
489 (save-excursion
490 (beginning-of-line)
491 (prog1
492 (re-search-forward comment-start-skip
493 (save-excursion (end-of-line)
494 (point))
495 t)
496 (setq comment-start-place (point))))))
497 ;; Inside a comment: fill one comment paragraph.
498 (let ((fill-prefix
499 ;; The prefix for each line of this paragraph
500 ;; is the appropriate part of the start of this line,
501 ;; up to the column at which text should be indented.
502 (save-excursion
503 (beginning-of-line)
504 (if (looking-at "[ \t]*/\\*.*\\*/")
505 (progn (re-search-forward comment-start-skip)
506 (make-string (current-column) ?\ ))
507 (if first-line (forward-line 1))
508
509 (let ((line-width (progn (end-of-line) (current-column))))
510 (beginning-of-line)
511 (prog1
512 (buffer-substring
513 (point)
514
515 ;; How shall we decide where the end of the
516 ;; fill-prefix is?
517 ;; calculate-c-indent-within-comment bases its value
518 ;; on the indentation of previous lines; if they're
519 ;; indented specially, it could return a column
520 ;; that's well into the current line's text. So
521 ;; we'll take at most that many space, tab, or *
522 ;; characters, and use that as our fill prefix.
523 (let ((max-prefix-end
524 (progn
525 (move-to-column
526 (calculate-c-indent-within-comment t)
527 t)
528 (point))))
529 (beginning-of-line)
530 (skip-chars-forward " \t*" max-prefix-end)
531 ;; Don't include part of comment terminator
532 ;; in the fill-prefix.
533 (and (eq (following-char) ?/)
534 (eq (preceding-char) ?*)
535 (backward-char 1))
536 (point)))
537
538 ;; If the comment is only one line followed by a blank
539 ;; line, calling move-to-column above may have added
540 ;; some spaces and tabs to the end of the line; the
541 ;; fill-paragraph function will then delete it and the
542 ;; newline following it, so we'll lose a blank line
543 ;; when we shouldn't. So delete anything
544 ;; move-to-column added to the end of the line. We
545 ;; record the line width instead of the position of the
546 ;; old line end because move-to-column might break a
547 ;; tab into spaces, and the new characters introduced
548 ;; there shouldn't be deleted.
549
550 ;; If you can see a better way to do this, please make
551 ;; the change. This seems very messy to me.
552 (delete-region (progn (move-to-column line-width)
553 (point))
554 (progn (end-of-line) (point))))))))
555
556 (paragraph-start
557 ;; Lines containing just a comment start or just an end
558 ;; should not be filled into paragraphs they are next to.
559 (concat
560 paragraph-start
561 "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))
562 (paragraph-separate
563 (concat
564 paragraph-separate
565 "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))
566 (chars-to-delete 0))
567 (save-restriction
568 ;; Don't fill the comment together with the code following it.
569 ;; So temporarily exclude everything before the comment start,
570 ;; and everything after the line where the comment ends.
571 ;; If comment-start-place is non-nil, the comment starter is there.
572 ;; Otherwise, point is inside the comment.
573 (narrow-to-region (save-excursion
574 (if comment-start-place
575 (goto-char comment-start-place)
576 (search-backward "/*"))
577 ;; Protect text before the comment start
578 ;; by excluding it. Add spaces to bring back
579 ;; proper indentation of that point.
580 (let ((column (current-column)))
581 (prog1 (point)
582 (setq chars-to-delete column)
583 (insert-char ?\ column))))
584 (save-excursion
585 (if comment-start-place
586 (goto-char (+ comment-start-place 2)))
587 (search-forward "*/" nil 'move)
588 (forward-line 1)
589 (point)))
590 (save-excursion
591 (goto-char (point-max))
592 (forward-line -1)
593 ;; And comment terminator was on a separate line before,
594 ;; keep it that way.
595 ;; This also avoids another problem:
596 ;; if the fill-prefix ends in a *, it could eat up
597 ;; the * of the comment terminator.
598 (if (looking-at "[ \t]*\\*/")
599 (narrow-to-region (point-min) (point))))
600 (fill-paragraph arg)
601 (save-excursion
602 ;; Delete the chars we inserted to avoid clobbering
603 ;; the stuff before the comment start.
604 (goto-char (point-min))
605 (if (> chars-to-delete 0)
606 (delete-region (point) (+ (point) chars-to-delete)))
607 ;; Find the comment ender (should be on last line of buffer,
608 ;; given the narrowing) and don't leave it on its own line.
609 ;; Do this with a fill command, so as to preserve sentence
610 ;; boundaries.
611 (goto-char (point-max))
612 (forward-line -1)
613 (search-forward "*/" nil 'move)
614 (beginning-of-line)
615 (if (looking-at "[ \t]*\\*/")
616 (let ((fill-column (+ fill-column 9999)))
617 (forward-line -1)
618 (fill-region-as-paragraph (point) (point-max)))))))
619 ;; Outside of comments: do ordinary filling.
620 (fill-paragraph arg)))
621 t))
622
623(defun electric-c-brace (arg)
624 "Insert character and correct line's indentation."
625 (interactive "P")
626 (let (insertpos)
627 (if (and (not arg)
628 (eolp)
629 (or (save-excursion
630 (skip-chars-backward " \t")
631 (bolp))
632 (if c-auto-newline (progn (c-indent-line) (newline) t) nil)))
633 (progn
634 (insert last-command-char)
635 (c-indent-line)
636 (if c-auto-newline
637 (progn
638 (newline)
639 ;; (newline) may have done auto-fill
640 (setq insertpos (- (point) 2))
641 (c-indent-line)))
642 (save-excursion
643 (if insertpos (goto-char (1+ insertpos)))
644 (delete-char -1))))
645 (if insertpos
646 (save-excursion
647 (goto-char insertpos)
648 (self-insert-command (prefix-numeric-value arg)))
649 (self-insert-command (prefix-numeric-value arg)))))
650
651(defun electric-c-sharp-sign (arg)
652 "Insert character and correct line's indentation."
653 (interactive "P")
654 (if (save-excursion
655 (skip-chars-backward " \t")
656 (bolp))
657 (let ((c-auto-newline nil))
658 (electric-c-terminator arg))
659 (self-insert-command (prefix-numeric-value arg))))
660
661(defun electric-c-semi (arg)
662 "Insert character and correct line's indentation."
663 (interactive "P")
664 (if c-auto-newline
665 (electric-c-terminator arg)
666 (self-insert-command (prefix-numeric-value arg))))
667
668(defun electric-c-terminator (arg)
669 "Insert character and correct line's indentation."
670 (interactive "P")
671 (let (insertpos (end (point)))
672 (if (and (not arg) (eolp)
673 (not (save-excursion
674 (beginning-of-line)
675 (skip-chars-forward " \t")
676 (or (= (following-char) ?#)
677 ;; Colon is special only after a label, or case ....
678 ;; So quickly rule out most other uses of colon
679 ;; and do no indentation for them.
680 (and (eq last-command-char ?:)
681 (not (looking-at c-switch-label-regexp))
682 (save-excursion
683 (skip-chars-forward "a-zA-Z0-9_$")
684 (skip-chars-forward " \t")
685 (< (point) end)))
686 (progn
687 (beginning-of-defun)
688 (let ((pps (parse-partial-sexp (point) end)))
689 (or (nth 3 pps) (nth 4 pps) (nth 5 pps))))))))
690 (progn
691 (insert last-command-char)
692 (c-indent-line)
693 (and c-auto-newline
694 (not (c-inside-parens-p))
695 (progn
696 (newline)
697 ;; (newline) may have done auto-fill
698 (setq insertpos (- (point) 2))
699 (c-indent-line)))
700 (save-excursion
701 (if insertpos (goto-char (1+ insertpos)))
702 (delete-char -1))))
703 (if insertpos
704 (save-excursion
705 (goto-char insertpos)
706 (self-insert-command (prefix-numeric-value arg)))
707 (self-insert-command (prefix-numeric-value arg)))))
708
709(defun c-inside-parens-p ()
710 (condition-case ()
711 (save-excursion
712 (save-restriction
713 (narrow-to-region (point)
714 (progn (beginning-of-defun) (point)))
715 (goto-char (point-max))
716 (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\()))
717 (error nil)))
718
719(defun c-indent-command (&optional whole-exp)
720 "Indent current line as C code, or in some cases insert a tab character.
721If `c-tab-always-indent' is non-nil (the default), always indent current line.
722Otherwise, indent the current line only if point is at the left margin or
723in the line's indentation; otherwise insert a tab.
724
725A numeric argument, regardless of its value, means indent rigidly all the
726lines of the expression starting after point so that this line becomes
727properly indented. The relative indentation among the lines of the
728expression are preserved."
729 (interactive "P")
730 (if whole-exp
731 ;; If arg, always indent this line as C
732 ;; and shift remaining lines of expression the same amount.
733 (let ((shift-amt (c-indent-line))
734 beg end)
735 (save-excursion
736 (if c-tab-always-indent
737 (beginning-of-line))
738 ;; Find beginning of following line.
739 (save-excursion
740 (forward-line 1) (setq beg (point)))
741 ;; Find first beginning-of-sexp for sexp extending past this line.
742 (while (< (point) beg)
743 (forward-sexp 1)
744 (setq end (point))
745 (skip-chars-forward " \t\n")))
746 (if (> end beg)
747 (indent-code-rigidly beg end shift-amt "#")))
748 (if (and (not c-tab-always-indent)
749 (save-excursion
750 (skip-chars-backward " \t")
751 (not (bolp))))
752 (insert-tab)
753 (c-indent-line))))
754
755(defun c-indent-line ()
756 "Indent current line as C code.
757Return the amount the indentation changed by."
758 (let ((indent (calculate-c-indent nil))
759 beg shift-amt
760 (case-fold-search nil)
761 (pos (- (point-max) (point))))
762 (beginning-of-line)
763 (setq beg (point))
764 (cond ((eq indent nil)
765 (setq indent (current-indentation)))
766 ((eq indent t)
767 (setq indent (calculate-c-indent-within-comment)))
768 ((looking-at "[ \t]*#")
769 (setq indent 0))
770 (t
771 (skip-chars-forward " \t")
772 (if (listp indent) (setq indent (car indent)))
773 (cond ((or (looking-at c-switch-label-regexp)
774 (and (looking-at "[A-Za-z]")
775 (save-excursion
776 (forward-sexp 1)
777 (looking-at ":"))))
778 (setq indent (max 1 (+ indent c-label-offset))))
779 ((and (looking-at "else\\b")
780 (not (looking-at "else\\s_")))
781 (setq indent (save-excursion
782 (c-backward-to-start-of-if)
783 (current-indentation))))
784 ((and (looking-at "}[ \t]*else\\b")
785 (not (looking-at "}[ \t]*else\\s_")))
786 (setq indent (save-excursion
787 (forward-char)
788 (backward-sexp)
789 (c-backward-to-start-of-if)
790 (current-indentation))))
791 ((and (looking-at "while\\b")
792 (not (looking-at "while\\s_"))
793 (save-excursion
794 (c-backward-to-start-of-do)))
795 ;; This is a `while' that ends a do-while.
796 (setq indent (save-excursion
797 (c-backward-to-start-of-do)
798 (current-indentation))))
799 ((= (following-char) ?})
800 (setq indent (- indent c-indent-level)))
801 ((= (following-char) ?{)
802 (setq indent (+ indent c-brace-offset))))))
803 (skip-chars-forward " \t")
804 (setq shift-amt (- indent (current-column)))
805 (if (zerop shift-amt)
806 (if (> (- (point-max) pos) (point))
807 (goto-char (- (point-max) pos)))
808 (delete-region beg (point))
809 (indent-to indent)
810 ;; If initial point was within line's indentation,
811 ;; position after the indentation. Else stay at same point in text.
812 (if (> (- (point-max) pos) (point))
813 (goto-char (- (point-max) pos))))
814 shift-amt))
815
816(defun calculate-c-indent (&optional parse-start)
817 "Return appropriate indentation for current line as C code.
818In usual case returns an integer: the column to indent to.
819Returns nil if line starts inside a string, t if in a comment."
820 (save-excursion
821 (beginning-of-line)
822 (let ((indent-point (point))
823 (case-fold-search nil)
824 state
825 containing-sexp)
826 (if parse-start
827 (goto-char parse-start)
828 (beginning-of-defun))
829 (while (< (point) indent-point)
830 (setq parse-start (point))
831 (setq state (parse-partial-sexp (point) indent-point 0))
832 (setq containing-sexp (car (cdr state))))
833 (cond ((or (nth 3 state) (nth 4 state))
834 ;; return nil or t if should not change this line
835 (nth 4 state))
836 ((null containing-sexp)
837 ;; Line is at top level. May be data or function definition,
838 ;; or may be function argument declaration.
839 ;; Indent like the previous top level line
840 ;; unless that ends in a closeparen without semicolon,
841 ;; in which case this line is the first argument decl.
842 (goto-char indent-point)
843 (skip-chars-forward " \t")
844 (if (= (following-char) ?{)
845 0 ; Unless it starts a function body
846 (c-backward-to-noncomment (or parse-start (point-min)))
847 ;; Look at previous line that's at column 0
848 ;; to determine whether we are in top-level decls
849 ;; or function's arg decls. Set basic-indent accordingly.
850 (let ((basic-indent
851 (save-excursion
852 (re-search-backward "^[^ \^L\t\n#]" nil 'move)
853 (let (comment lim)
854 ;; Recognize the DEFUN macro in Emacs.
855 (if (save-excursion
856 ;; Move down to the (putative) argnames line.
857 (while (and (not (eobp))
858 (not (looking-at " *[({}#/]")))
859 (forward-line 1))
860 ;; Go back to the DEFUN, if it is one.
861 (condition-case nil
862 (backward-sexp 1)
863 (error))
864 (beginning-of-line)
865 (looking-at "DEFUN\\b"))
866 c-argdecl-indent
867 (if (and (looking-at "\\sw\\|\\s_")
868 ;; This is careful to stop at the first
869 ;; paren if we have
870 ;; int foo Proto ((int, int));
871 (looking-at "[^\"\n=(]*(")
872 (progn
873 (goto-char (1- (match-end 0)))
874 ;; Skip any number of paren-groups.
875 ;; Consider typedef int (*fcn) (int);
876 (while (= (following-char) ?\()
877 (setq lim (point))
878 (condition-case nil
879 (forward-sexp 1)
880 (error))
881 (skip-chars-forward " \t\f"))
882 ;; Have we reached something
883 ;; that shows this isn't a function
884 ;; definition?
885 (and (< (point) indent-point)
886 (not (memq (following-char)
887 '(?\, ?\;)))))
888 ;; Make sure the "function decl" we found
889 ;; is not inside a comment.
890 (progn
891 ;; Move back to the `(' starting arglist
892 (goto-char lim)
893 (beginning-of-line)
894 (while (and (not comment)
895 (search-forward "/*" lim t))
896 (setq comment
897 (not (search-forward "*/" lim t))))
898 (not comment)))
899 c-argdecl-indent 0))))))
900 basic-indent)))
901
902;; ;; Now add a little if this is a continuation line.
903;; (+ basic-indent (if (or (bobp)
904;; (memq (preceding-char) '(?\) ?\; ?\}))
905;; ;; Line with zero indentation
906;; ;; is probably the return-type
907;; ;; of a function definition,
908;; ;; so following line is function name.
909;; (= (current-indentation) 0))
910;; 0 c-continued-statement-offset))
911
912 ((/= (char-after containing-sexp) ?{)
913 ;; line is expression, not statement:
914 ;; indent to just after the surrounding open.
915 (goto-char (1+ containing-sexp))
916 (current-column))
917 (t
918 ;; Statement level. Is it a continuation or a new statement?
919 ;; Find previous non-comment character.
920 (goto-char indent-point)
921 (c-backward-to-noncomment containing-sexp)
922 ;; Back up over label lines, since they don't
923 ;; affect whether our line is a continuation.
924 (while (or (eq (preceding-char) ?\,)
925 (and (eq (preceding-char) ?:)
926 (or (eq (char-after (- (point) 2)) ?\')
927 (memq (char-syntax (char-after (- (point) 2)))
928 '(?w ?_)))))
929 (if (eq (preceding-char) ?\,)
930 (progn (forward-char -1)
931 (c-backward-to-start-of-continued-exp containing-sexp)))
932 (beginning-of-line)
933 (c-backward-to-noncomment containing-sexp))
934 ;; Check for a preprocessor statement or its continuation lines.
935 ;; Move back to end of previous non-preprocessor line,
936 ;; or possibly beginning of buffer.
937 (let ((found (point)) stop)
938 (while (not stop)
939 (beginning-of-line)
940 (cond ((bobp)
941 (setq found (point)
942 stop t))
943 ((save-excursion (forward-char -1)
944 (= (preceding-char) ?\\))
945 (forward-char -1))
946 ;; This line is not preceded by a backslash.
947 ;; So either it starts a preprocessor command
948 ;; or any following continuation lines
949 ;; should not be skipped.
950 ((= (following-char) ?#)
951 (forward-char -1)
952 (setq found (point)))
953 (t (setq stop t))))
954 (goto-char found))
955 ;; Now we get the answer.
956 (if (and (not (memq (preceding-char) '(0 ?\, ?\; ?\} ?\{)))
957 ;; But don't treat a line with a close-brace
958 ;; as a continuation. It is probably the
959 ;; end of an enum type declaration.
960 (save-excursion
961 (goto-char indent-point)
962 (skip-chars-forward " \t")
963 (not (= (following-char) ?}))))
964 ;; This line is continuation of preceding line's statement;
965 ;; indent c-continued-statement-offset more than the
966 ;; previous line of the statement.
967 (progn
968 (c-backward-to-start-of-continued-exp containing-sexp)
969 (+ c-continued-statement-offset (current-column)
970 (if (save-excursion (goto-char indent-point)
971 (skip-chars-forward " \t")
972 (eq (following-char) ?{))
973 c-continued-brace-offset 0)))
974 ;; This line starts a new statement.
975 ;; Position following last unclosed open.
976 (goto-char containing-sexp)
977 ;; Is line first statement after an open-brace?
978 (or
979 ;; If no, find that first statement and indent like it.
980 (save-excursion
981 (forward-char 1)
982 (let ((colon-line-end 0))
983 (while (progn (skip-chars-forward " \t\n")
984 (looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:"))
985 ;; Skip over comments and labels following openbrace.
986 (cond ((= (following-char) ?\#)
987 (forward-line 1))
988 ((= (following-char) ?\/)
989 (forward-char 2)
990 (search-forward "*/" nil 'move))
991 ;; case or label:
992 (t
993 (save-excursion (end-of-line)
994 (setq colon-line-end (point)))
995 (search-forward ":"))))
996 ;; The first following code counts
997 ;; if it is before the line we want to indent.
998 (and (< (point) indent-point)
999 (-
1000 (if (> colon-line-end (point))
1001 (- (current-indentation) c-label-offset)
1002 (current-column))
1003 ;; If prev stmt starts with open-brace, that
1004 ;; open brace was offset by c-brace-offset.
1005 ;; Compensate to get the column where
1006 ;; an ordinary statement would start.
1007 (if (= (following-char) ?\{) c-brace-offset 0)))))
1008 ;; If no previous statement,
1009 ;; indent it relative to line brace is on.
1010 (calculate-c-indent-after-brace))))))))
1011
1012(defun calculate-c-indent-after-brace ()
1013 "Return the proper C indent for the first line after an open-brace.
1014This function is called with point before the brace."
1015 ;; For open brace in column zero, don't let statement
1016 ;; start there too. If c-indent-level is zero,
1017 ;; use c-brace-offset + c-continued-statement-offset instead.
1018 ;; For open-braces not the first thing in a line,
1019 ;; add in c-brace-imaginary-offset.
1020 (+ (if (and (bolp) (zerop c-indent-level))
1021 (+ c-brace-offset c-continued-statement-offset)
1022 c-indent-level)
1023 ;; Move back over whitespace before the openbrace.
1024 ;; If openbrace is not first nonwhite thing on the line,
1025 ;; add the c-brace-imaginary-offset.
1026 (progn (skip-chars-backward " \t")
1027 (if (bolp) 0 c-brace-imaginary-offset))
1028 ;; If the openbrace is preceded by a parenthesized exp,
1029 ;; move to the beginning of that;
1030 ;; possibly a different line
1031 (progn
1032 (if (eq (preceding-char) ?\))
1033 (forward-sexp -1))
1034 ;; Get initial indentation of the line we are on.
1035 (current-indentation))))
1036
1037(defun calculate-c-indent-within-comment (&optional after-star)
1038 "Return the indentation amount for line inside a block comment.
1039Optional arg AFTER-STAR means, if lines in the comment have a leading star,
1040return the indentation of the text that would follow this star."
1041 (let (end star-start)
1042 (save-excursion
1043 (beginning-of-line)
1044 (skip-chars-forward " \t")
1045 (setq star-start (= (following-char) ?\*))
1046 (skip-chars-backward " \t\n")
1047 (setq end (point))
1048 (beginning-of-line)
1049 (skip-chars-forward " \t")
1050 (if after-star
1051 (and (looking-at "\\*")
1052 (re-search-forward "\\*[ \t]*")))
1053 (and (re-search-forward "/\\*[ \t]*" end t)
1054 star-start
1055 (not after-star)
1056 (goto-char (1+ (match-beginning 0))))
1057 (if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*))
1058 (1+ (current-column))
1059 (current-column)))))
1060
1061
1062(defun c-backward-to-noncomment (lim)
1063 (let (opoint stop)
1064 (while (not stop)
1065 (skip-chars-backward " \t\n\f" lim)
1066 (setq opoint (point))
1067 (if (and (>= (point) (+ 2 lim))
1068 (save-excursion
1069 (forward-char -2)
1070 (looking-at "\\*/")))
1071 (search-backward "/*" lim 'move)
1072 (setq stop (or (<= (point) lim)
1073 (save-excursion
1074 (beginning-of-line)
1075 (skip-chars-forward " \t")
1076 (not (looking-at "#")))))
1077 (or stop (beginning-of-line))))))
1078
1079(defun c-backward-to-start-of-continued-exp (lim)
1080 (if (memq (preceding-char) '(?\) ?\"))
1081 (forward-sexp -1))
1082 (beginning-of-line)
1083 (if (<= (point) lim)
1084 (goto-char (1+ lim)))
1085 (skip-chars-forward " \t"))
1086
1087(defun c-backward-to-start-of-if (&optional limit)
1088 "Move to the start of the last \"unbalanced\" `if'."
1089 (or limit (setq limit (save-excursion (beginning-of-defun) (point))))
1090 (let ((if-level 1)
1091 (case-fold-search nil))
1092 (while (and (not (bobp)) (not (zerop if-level)))
1093 (backward-sexp 1)
1094 (cond ((and (looking-at "else\\b")
1095 (not (looking-at "else\\s_")))
1096 (setq if-level (1+ if-level)))
1097 ((and (looking-at "if\\b")
1098 (not (looking-at "if\\s_")))
1099 (setq if-level (1- if-level)))
1100 ((< (point) limit)
1101 (setq if-level 0)
1102 (goto-char limit))))))
1103
1104(defun c-backward-to-start-of-do (&optional limit)
1105 "If point follows a `do' statement, move to beginning of it and return t.
1106Otherwise return nil and don't move point."
1107 (or limit (setq limit (save-excursion (beginning-of-defun) (point))))
1108 (let ((first t)
1109 (startpos (point))
1110 (done nil))
1111 (while (not done)
1112 (let ((next-start (point)))
1113 (condition-case nil
1114 ;; Move back one token or one brace or paren group.
1115 (backward-sexp 1)
1116 ;; If we find an open-brace, we lose.
1117 (error (setq done 'fail)))
1118 (if done
1119 nil
1120 ;; If we reached a `do', we win.
1121 (if (looking-at "do\\b")
1122 (setq done 'succeed)
1123 ;; Otherwise, if we skipped a semicolon, we lose.
1124 ;; (Exception: we can skip one semicolon before getting
1125 ;; to a the last token of the statement, unless that token
1126 ;; is a close brace.)
1127 (if (save-excursion
1128 (forward-sexp 1)
1129 (or (and (not first) (= (preceding-char) ?}))
1130 (search-forward ";" next-start t
1131 (if (and first
1132 (/= (preceding-char) ?}))
1133 2 1))))
1134 (setq done 'fail)
1135 (setq first nil)
1136 ;; If we go too far back in the buffer, we lose.
1137 (if (< (point) limit)
1138 (setq done 'fail)))))))
1139 (if (eq done 'succeed)
1140 t
1141 (goto-char startpos)
1142 nil)))
1143
1144(defun c-beginning-of-statement (count)
1145 "Go to the beginning of the innermost C statement.
1146With prefix arg, go back N - 1 statements. If already at the beginning of a
1147statement then go to the beginning of the preceding one.
1148If within a string or comment, or next to a comment (only whitespace between),
1149move by sentences instead of statements."
1150 (interactive "p")
1151 (let ((here (point)) state)
1152 (save-excursion
1153 (beginning-of-defun)
1154 (setq state (parse-partial-sexp (point) here nil nil)))
1155 (if (or (nth 3 state) (nth 4 state)
1156 (looking-at (concat "[ \t]*" comment-start-skip))
1157 (save-excursion (skip-chars-backward " \t")
1158 (goto-char (- (point) 2))
1159 (looking-at "\\*/")))
1160 (forward-sentence (- count))
1161 (while (> count 0)
1162 (c-beginning-of-statement-1)
1163 (setq count (1- count)))
1164 (while (< count 0)
1165 (c-end-of-statement-1)
1166 (setq count (1+ count))))))
1167
1168(defun c-end-of-statement (count)
1169 "Go to the end of the innermost C statement.
1170With prefix arg, go forward N - 1 statements.
1171Move forward to end of the next statement if already at end.
1172If within a string or comment, move by sentences instead of statements."
1173 (interactive "p")
1174 (c-beginning-of-statement (- count)))
1175
1176(defun c-beginning-of-statement-1 ()
1177 (let ((last-begin (point))
1178 (first t))
1179 (condition-case ()
1180 (progn
1181 (while (and (not (bobp))
1182 (progn
1183 (backward-sexp 1)
1184 (or first
1185 (not (re-search-forward "[;{}]" last-begin t)))))
1186 (setq last-begin (point) first nil))
1187 (goto-char last-begin))
1188 (error (if first (backward-up-list 1) (goto-char last-begin))))))
1189
1190(defun c-end-of-statement-1 ()
1191 (condition-case ()
1192 (progn
1193 (while (and (not (eobp))
1194 (let ((beg (point)))
1195 (forward-sexp 1)
1196 (let ((end (point)))
1197 (save-excursion
1198 (goto-char beg)
1199 (not (re-search-forward "[;{}]" end t)))))))
1200 (re-search-backward "[;}]")
1201 (forward-char 1))
1202 (error
1203 (let ((beg (point)))
1204 (backward-up-list -1)
1205 (let ((end (point)))
1206 (goto-char beg)
1207 (search-forward ";" end 'move))))))
1208
1209(defun mark-c-function ()
1210 "Put mark at end of C function, point at beginning."
1211 (interactive)
1212 (push-mark (point))
1213 (end-of-defun)
1214 (push-mark (point) nil t)
1215 (beginning-of-defun)
1216 (backward-paragraph))
1217
1218;; Idea of ENDPOS is, indent each line, stopping when
1219;; ENDPOS is encountered. But it's too much of a pain to make that work.
1220(defun indent-c-exp (&optional endpos)
1221 "Indent each line of the C grouping following point."
1222 (interactive)
1223 (let* ((indent-stack (list nil))
1224 (opoint (point)) ;; May be altered below.
1225 (contain-stack
1226 (list (if endpos
1227 (let (funbeg)
1228 ;; Find previous fcn-start.
1229 (save-excursion (forward-char 1)
1230 (beginning-of-defun)
1231 (setq funbeg (point)))
1232 (setq opoint funbeg)
1233 ;; Try to find containing open,
1234 ;; but don't scan past that fcn-start.
1235 (save-restriction
1236 (narrow-to-region funbeg (point))
1237 (condition-case nil
1238 (save-excursion
1239 (backward-up-list 1)
1240 (point))
1241 ;; We gave up: must be between fcns.
1242 ;; Set opoint to beg of prev fcn
1243 ;; since otherwise calculate-c-indent
1244 ;; will get wrong answers.
1245 (error (setq opoint funbeg)
1246 (point)))))
1247 (point))))
1248 (case-fold-search nil)
1249 restart outer-loop-done inner-loop-done state ostate
1250 this-indent last-sexp
1251 at-else at-brace at-while
1252 last-depth this-point
1253 (next-depth 0))
1254 ;; If the braces don't match, get an error right away.
1255 (save-excursion
1256 (forward-sexp 1))
1257 ;; Realign the comment on the first line, even though we don't reindent it.
1258 (save-excursion
1259 (let ((beg (point)))
1260 (and (re-search-forward
1261 comment-start-skip
1262 (save-excursion (end-of-line) (point)) t)
1263 ;; Make sure this isn't a comment alone on a line
1264 ;; (which should be indented like code instead).
1265 (save-excursion
1266 (goto-char (match-beginning 0))
1267 (skip-chars-backward " \t")
1268 (not (bolp)))
1269 ;; Make sure the comment starter we found
1270 ;; is not actually in a string or quoted.
1271 (let ((new-state
1272 (parse-partial-sexp beg (point)
1273 nil nil state)))
1274 (and (not (nth 3 new-state)) (not (nth 5 new-state))))
1275 (progn (indent-for-comment) (beginning-of-line)))))
1276 (save-excursion
1277 (setq outer-loop-done nil)
1278 (while (and (not (eobp))
1279 (if endpos (< (point) endpos)
1280 (not outer-loop-done)))
1281 (setq last-depth next-depth)
1282 ;; Compute how depth changes over this line
1283 ;; plus enough other lines to get to one that
1284 ;; does not end inside a comment or string.
1285 ;; Meanwhile, do appropriate indentation on comment lines.
1286 (setq inner-loop-done nil)
1287 (while (and (not inner-loop-done)
1288 (not (and (eobp) (setq outer-loop-done t))))
1289 (setq ostate state)
1290 (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
1291 nil nil state))
1292 (setq next-depth (car state))
1293 (if (and (car (cdr (cdr state)))
1294 (>= (car (cdr (cdr state))) 0))
1295 (setq last-sexp (car (cdr (cdr state)))))
1296 ;; If this line started within a comment, indent it as such.
1297 (if (or (nth 4 ostate) (nth 7 ostate))
1298 (c-indent-line))
1299 ;; If it ends outside of comments or strings, exit the inner loop.
1300 ;; Otherwise move on to next line.
1301 (if (or (nth 3 state) (nth 4 state) (nth 7 state))
1302 (forward-line 1)
1303 (setq inner-loop-done t)))
1304 (and endpos
1305 (while (< next-depth 0)
1306 (setq indent-stack (append indent-stack (list nil)))
1307 (setq contain-stack (append contain-stack (list nil)))
1308 (setq next-depth (1+ next-depth))
1309 (setq last-depth (1+ last-depth))
1310 (setcar (nthcdr 6 state) (1+ (nth 6 state)))))
1311 (setq outer-loop-done (and (not endpos) (<= next-depth 0)))
1312 (if outer-loop-done
1313 nil
1314 ;; If this line had ..))) (((.. in it, pop out of the levels
1315 ;; that ended anywhere in this line, even if the final depth
1316 ;; doesn't indicate that they ended.
1317 (while (> last-depth (nth 6 state))
1318 (setq indent-stack (cdr indent-stack)
1319 contain-stack (cdr contain-stack)
1320 last-depth (1- last-depth)))
1321 (if (/= last-depth next-depth)
1322 (setq last-sexp nil))
1323 ;; Add levels for any parens that were started in this line.
1324 (while (< last-depth next-depth)
1325 (setq indent-stack (cons nil indent-stack)
1326 contain-stack (cons nil contain-stack)
1327 last-depth (1+ last-depth)))
1328 (if (null (car contain-stack))
1329 (setcar contain-stack (or (car (cdr state))
1330 (save-excursion (forward-sexp -1)
1331 (point)))))
1332 (forward-line 1)
1333 (skip-chars-forward " \t")
1334 ;; Don't really reindent if the line is just whitespace,
1335 ;; or if it is past the endpos.
1336 ;; (The exit test in the outer while
1337 ;; does not exit until we have passed the first line
1338 ;; past the region.)
1339 (if (or (eolp) (and endpos (>= (point) endpos)))
1340 nil
1341 ;; Is this line in a new nesting level?
1342 ;; In other words, is this the first line that
1343 ;; starts in the new level?
1344 (if (and (car indent-stack)
1345 (>= (car indent-stack) 0))
1346 nil
1347 ;; Yes.
1348 ;; Compute the standard indent for this level.
1349 (let (val)
1350 (if (= (char-after (car contain-stack)) ?{)
1351 (save-excursion
1352 (goto-char (car contain-stack))
1353 (setq val (calculate-c-indent-after-brace)))
1354 (setq val (calculate-c-indent
1355 (if (car indent-stack)
1356 (- (car indent-stack))
1357 opoint))))
1358 ;; t means we are in a block comment and should
1359 ;; calculate accordingly.
1360 (if (eq val t)
1361 (setq val (calculate-c-indent-within-comment)))
1362 (setcar indent-stack val)))
1363 ;; Adjust indent of this individual line
1364 ;; based on its predecessor.
1365 ;; Handle continuation lines, if, else, while, and so on.
1366 (if (/= (char-after (car contain-stack)) ?{)
1367 (setq this-indent (car indent-stack))
1368 ;; Line is at statement level.
1369 ;; Is it a new statement? Is it an else?
1370 ;; Find last non-comment character before this line
1371 (save-excursion
1372 (setq this-point (point))
1373 (setq at-else (and (looking-at "else\\b")
1374 (not (looking-at "else\\s_"))))
1375 (setq at-brace (= (following-char) ?{))
1376 (setq at-while (and (looking-at "while\\b")
1377 (not (looking-at "while\\s_"))))
1378 (if (= (following-char) ?})
1379 (setq this-indent (car indent-stack))
1380 (c-backward-to-noncomment opoint)
1381 (if (not (memq (preceding-char) '(0 ?\, ?\; ?} ?: ?{)))
1382 ;; Preceding line did not end in comma or semi;
1383 ;; indent this line c-continued-statement-offset
1384 ;; more than previous.
1385 (progn
1386 (c-backward-to-start-of-continued-exp (car contain-stack))
1387 (setq this-indent
1388 (+ c-continued-statement-offset (current-column)
1389 (if at-brace c-continued-brace-offset 0))))
1390 ;; Preceding line ended in comma or semi;
1391 ;; use the standard indent for this level.
1392 (cond (at-else (progn (c-backward-to-start-of-if opoint)
1393 (setq this-indent
1394 (current-indentation))))
1395 ((and at-while (c-backward-to-start-of-do opoint))
1396 (setq this-indent (current-indentation)))
1397 ((eq (preceding-char) ?\,)
1398 (goto-char this-point)
1399 (setq this-indent (calculate-c-indent)))
1400 (t (setq this-indent (car indent-stack))))))))
1401 ;; Adjust line indentation according to its contents
1402 (if (or (looking-at c-switch-label-regexp)
1403 (and (looking-at "[A-Za-z]")
1404 (save-excursion
1405 (forward-sexp 1)
1406 (looking-at ":"))))
1407 (setq this-indent (max 1 (+ this-indent c-label-offset))))
1408 (if (= (following-char) ?})
1409 (setq this-indent (- this-indent c-indent-level)))
1410 (if (= (following-char) ?{)
1411 ;; Don't move an open-brace in column 0.
1412 ;; This is good when constructs such as
1413 ;; `extern "C" {' surround a function definition
1414 ;; that should be indented as usual.
1415 ;; It is also good for nested functions.
1416 ;; It is bad when an open-brace is indented at column 0
1417 ;; and you want to fix that, but we can't win 'em all.
1418 (if (zerop (current-column))
1419 (setq this-indent 0)
1420 (setq this-indent (+ this-indent c-brace-offset))))
1421 ;; Don't leave indentation in empty lines.
1422 (if (eolp) (setq this-indent 0))
1423 ;; Put chosen indentation into effect.
1424 (or (= (current-column) this-indent)
1425 (= (following-char) ?\#)
1426 (progn
1427 (delete-region (point) (progn (beginning-of-line) (point)))
1428 (indent-to this-indent)))
1429 ;; Indent any comment following the text.
1430 (or (looking-at comment-start-skip)
1431 (save-excursion
1432 (let ((beg (point)))
1433 (and (re-search-forward
1434 comment-start-skip
1435 (save-excursion (end-of-line) (point)) t)
1436 ;; Make sure the comment starter we found
1437 ;; is not actually in a string or quoted.
1438 (let ((new-state
1439 (parse-partial-sexp beg (point)
1440 nil nil state)))
1441 (and (not (nth 3 new-state)) (not (nth 5 new-state))))
1442 (indent-for-comment)))))))))))
1443
1444;; Look at all comment-start strings in the current line after point.
1445;; Return t if one of them starts a real comment.
1446;; This is not used yet, because indent-for-comment
1447;; isn't smart enough to handle the cases this can find.
1448(defun indent-c-find-real-comment ()
1449 (let (win)
1450 (while (and (not win)
1451 (re-search-forward comment-start-skip
1452 (save-excursion (end-of-line) (point))
1453 t))
1454 ;; Make sure the comment start is not quoted.
1455 (let ((state-1
1456 (parse-partial-sexp
1457 (save-excursion (beginning-of-line) (point))
1458 (point) nil nil state)))
1459 (setq win (and (null (nth 3 state-1)) (null (nth 5 state-1))))))
1460 win))
1461
1462;; Indent every line whose first char is between START and END inclusive.
1463(defun c-indent-region (start end)
1464 (save-excursion
1465 (goto-char start)
1466 ;; Advance to first nonblank line.
1467 (skip-chars-forward " \t\n")
1468 (beginning-of-line)
1469 (let ((endmark (copy-marker end))
1470 (c-tab-always-indent t))
1471 (while (and (bolp) (not (eobp)) (< (point) endmark))
1472 ;; Indent one line as with TAB.
1473 (let ((shift-amt (c-indent-line))
1474 nextline sexpbeg sexpend)
1475 (if (save-excursion (beginning-of-line) (looking-at "[ \t]*#"))
1476 (forward-line 1)
1477 (save-excursion
1478 ;; Find beginning of following line.
1479 (save-excursion
1480 (forward-line 1) (setq nextline (point)))
1481 ;; Find first beginning-of-sexp for sexp extending past this line.
1482 (beginning-of-line)
1483 (while (< (point) nextline)
1484 (condition-case nil
1485 (progn
1486 (forward-sexp 1)
1487 (setq sexpend (point-marker)))
1488 (error (setq sexpend nil)
1489 (goto-char nextline)))
1490 (skip-chars-forward " \t\n"))
1491 (if sexpend
1492 (progn
1493 ;; Make sure the sexp we found really starts on the
1494 ;; current line and extends past it.
1495 (goto-char sexpend)
1496 (backward-sexp 1)
1497 (setq sexpbeg (point)))))
1498 ;; If that sexp ends within the region,
1499 ;; indent it all at once, fast.
1500 (if (and sexpend (> sexpend nextline) (<= sexpend endmark)
1501 (< sexpbeg nextline))
1502 (progn
1503 (indent-c-exp)
1504 (goto-char sexpend)))
1505 ;; Move to following line and try again.
1506 (and sexpend (set-marker sexpend nil))
1507 (forward-line 1))))
1508 (set-marker endmark nil))))
1509
1510(defun set-c-style (style &optional global)
1511 "Set C-mode variables to use one of several different indentation styles.
1512The arguments are a string representing the desired style
1513and a flag which, if non-nil, means to set the style globally.
1514\(Interactively, the flag comes from the prefix argument.)
1515Available styles are GNU, K&R, BSD and Whitesmith."
1516 (interactive (list (let ((completion-ignore-case t))
1517 (completing-read "Use which C indentation style? "
1518 c-style-alist nil t))
1519 current-prefix-arg))
1520 (let ((vars (cdr (assoc style c-style-alist))))
1521 (or vars
1522 (error "Invalid C indentation style `%s'" style))
1523 (while vars
1524 (or global
1525 (make-local-variable (car (car vars))))
1526 (set (car (car vars)) (cdr (car vars)))
1527 (setq vars (cdr vars)))))
1528
1529;;; This page handles insertion and removal of backslashes for C macros.
1530
1531(defcustom c-backslash-column 48
1532 "*Minimum column for end-of-line backslashes of macro definitions."
1533 :type 'integer
1534 :group 'old-c)
1535
1536(defun c-backslash-region (from to delete-flag)
1537 "Insert, align, or delete end-of-line backslashes on the lines in the region.
1538With no argument, inserts backslashes and aligns existing backslashes.
1539With an argument, deletes the backslashes.
1540
1541This function does not modify the last line of the region if the region ends
1542right at the start of the following line; it does not modify blank lines
1543at the start of the region. So you can put the region around an entire macro
1544definition and conveniently use this command."
1545 (interactive "r\nP")
1546 (save-excursion
1547 (goto-char from)
1548 (let ((column c-backslash-column)
1549 (endmark (make-marker)))
1550 (move-marker endmark to)
1551 ;; Compute the smallest column number past the ends of all the lines.
1552 (if (not delete-flag)
1553 (while (< (point) to)
1554 (end-of-line)
1555 (if (= (preceding-char) ?\\)
1556 (progn (forward-char -1)
1557 (skip-chars-backward " \t")))
1558 (setq column (max column (1+ (current-column))))
1559 (forward-line 1)))
1560 ;; Adjust upward to a tab column, if that doesn't push past the margin.
1561 (if (> (% column tab-width) 0)
1562 (let ((adjusted (* (/ (+ column tab-width -1) tab-width) tab-width)))
1563 (if (< adjusted (window-width))
1564 (setq column adjusted))))
1565 ;; Don't modify blank lines at start of region.
1566 (goto-char from)
1567 (while (and (< (point) endmark) (eolp))
1568 (forward-line 1))
1569 ;; Add or remove backslashes on all the lines.
1570 (while (and (< (point) endmark)
1571 ;; Don't backslashify the last line
1572 ;; if the region ends right at the start of the next line.
1573 (save-excursion
1574 (forward-line 1)
1575 (< (point) endmark)))
1576 (if (not delete-flag)
1577 (c-append-backslash column)
1578 (c-delete-backslash))
1579 (forward-line 1))
1580 (move-marker endmark nil))))
1581
1582(defun c-append-backslash (column)
1583 (end-of-line)
1584 ;; Note that "\\\\" is needed to get one backslash.
1585 (if (= (preceding-char) ?\\)
1586 (progn (forward-char -1)
1587 (delete-horizontal-space)
1588 (indent-to column))
1589 (indent-to column)
1590 (insert "\\")))
1591
1592(defun c-delete-backslash ()
1593 (end-of-line)
1594 (or (bolp)
1595 (progn
1596 (forward-char -1)
1597 (if (looking-at "\\\\")
1598 (delete-region (1+ (point))
1599 (progn (skip-chars-backward " \t") (point)))))))
1600
1601(defun c-up-conditional (count)
1602 "Move back to the containing preprocessor conditional, leaving mark behind.
1603A prefix argument acts as a repeat count. With a negative argument,
1604move forward to the end of the containing preprocessor conditional.
1605When going backwards, `#elif' is treated like `#else' followed by `#if'.
1606When going forwards, `#elif' is ignored."
1607 (interactive "p")
1608 (c-forward-conditional (- count) t))
1609
1610(defun c-backward-conditional (count &optional up-flag)
1611 "Move back across a preprocessor conditional, leaving mark behind.
1612A prefix argument acts as a repeat count. With a negative argument,
1613move forward across a preprocessor conditional."
1614 (interactive "p")
1615 (c-forward-conditional (- count) up-flag))
1616
1617(defun c-forward-conditional (count &optional up-flag)
1618 "Move forward across a preprocessor conditional, leaving mark behind.
1619A prefix argument acts as a repeat count. With a negative argument,
1620move backward across a preprocessor conditional."
1621 (interactive "p")
1622 (let* ((forward (> count 0))
1623 (increment (if forward -1 1))
1624 (search-function (if forward 're-search-forward 're-search-backward))
1625 (opoint (point))
1626 (new))
1627 (save-excursion
1628 (while (/= count 0)
1629 (let ((depth (if up-flag 0 -1)) found)
1630 (save-excursion
1631 ;; Find the "next" significant line in the proper direction.
1632 (while (and (not found)
1633 ;; Rather than searching for a # sign that comes
1634 ;; at the beginning of a line aside from whitespace,
1635 ;; search first for a string starting with # sign.
1636 ;; Then verify what precedes it.
1637 ;; This is faster on account of the fastmap feature of
1638 ;; the regexp matcher.
1639 (funcall search-function
1640 "#[ \t]*\\(if\\|elif\\|endif\\)"
1641 nil t))
1642 (beginning-of-line)
1643 ;; Now verify it is really a preproc line.
1644 (if (looking-at "^[ \t]*#[ \t]*\\(if\\|elif\\|endif\\)")
1645 (let ((prev depth))
1646 ;; Update depth according to what we found.
1647 (beginning-of-line)
1648 (cond ((looking-at "[ \t]*#[ \t]*endif")
1649 (setq depth (+ depth increment)))
1650 ((looking-at "[ \t]*#[ \t]*elif")
1651 (if (and forward (= depth 0))
1652 (setq found (point))))
1653 (t (setq depth (- depth increment))))
1654 ;; If we are trying to move across, and we find
1655 ;; an end before we find a beginning, get an error.
1656 (if (and (< prev 0) (< depth prev))
1657 (error (if forward
1658 "No following conditional at this level"
1659 "No previous conditional at this level")))
1660 ;; When searching forward, start from next line
1661 ;; so that we don't find the same line again.
1662 (if forward (forward-line 1))
1663 ;; If this line exits a level of conditional, exit inner loop.
1664 (if (< depth 0)
1665 (setq found (point))))
1666 ;; If the line is not really a conditional, skip past it.
1667 (if forward (end-of-line)))))
1668 (or found
1669 (error "No containing preprocessor conditional"))
1670 (goto-char (setq new found)))
1671 (setq count (+ count increment))))
1672 (push-mark)
1673 (goto-char new)))
1674
1675(provide 'c-mode)
1676
1677;;; c-mode.el ends here
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