cc-styles.el 21.4 KB
Newer Older
Richard M. Stallman's avatar
Richard M. Stallman committed
1 2
;;; cc-styles.el --- support for styles in CC Mode

3
;; Copyright (C) 1985,1987,1992-2003 Free Software Foundation, Inc.
Richard M. Stallman's avatar
Richard M. Stallman committed
4

5 6
;; Authors:    1998- Martin Stjernholm
;;             1992-1999 Barry A. Warsaw
Richard M. Stallman's avatar
Richard M. Stallman committed
7 8
;;             1987 Dave Detlefs and Stewart Clamen
;;             1985 Richard M. Stallman
Barry A. Warsaw's avatar
Barry A. Warsaw committed
9
;; Maintainer: bug-cc-mode@gnu.org
Richard M. Stallman's avatar
Richard M. Stallman committed
10
;; Created:    22-Apr-1997 (split from cc-mode.el)
Karl Heuer's avatar
Karl Heuer committed
11
;; Version:    See cc-mode.el
Richard M. Stallman's avatar
Richard M. Stallman committed
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26
;; Keywords:   c languages oop

;; This file is part of GNU Emacs.

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
27
;; along with GNU Emacs; see the file COPYING.  If not, write to
Gerd Moellmann's avatar
Gerd Moellmann committed
28
;; the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Richard M. Stallman's avatar
Richard M. Stallman committed
29 30
;; Boston, MA 02111-1307, USA.

31 32 33 34
;;; Commentary:

;;; Code:

Barry A. Warsaw's avatar
Barry A. Warsaw committed
35
(eval-when-compile
Gerd Moellmann's avatar
Gerd Moellmann committed
36
  (let ((load-path
Gerd Moellmann's avatar
Gerd Moellmann committed
37 38 39
	 (if (and (boundp 'byte-compile-dest-file)
		  (stringp byte-compile-dest-file))
	     (cons (file-name-directory byte-compile-dest-file) load-path)
Gerd Moellmann's avatar
Gerd Moellmann committed
40
	   load-path)))
41
    (load "cc-bytecomp" nil t)))
Gerd Moellmann's avatar
Gerd Moellmann committed
42

Gerd Moellmann's avatar
Gerd Moellmann committed
43 44
(cc-require 'cc-defs)
(cc-require 'cc-vars)
45 46 47 48 49 50
(cc-require 'cc-align)
;; cc-align is only indirectly required: Styles added with
;; `c-add-style' often contains references to functions defined there.

;; Silence the compiler.
(cc-bytecomp-defvar adaptive-fill-first-line-regexp) ; Emacs
Barry A. Warsaw's avatar
Barry A. Warsaw committed
51

Richard M. Stallman's avatar
Richard M. Stallman committed
52

53
(defvar c-style-alist
Richard M. Stallman's avatar
Richard M. Stallman committed
54 55 56 57 58 59
  '(("gnu"
     (c-basic-offset . 2)
     (c-comment-only-line-offset . (0 . 0))
     (c-offsets-alist . ((statement-block-intro . +)
			 (knr-argdecl-intro . 5)
			 (substatement-open . +)
60
			 (substatement-label . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
61 62 63 64 65
			 (label . 0)
			 (statement-case-open . +)
			 (statement-cont . +)
			 (arglist-intro . c-lineup-arglist-intro-after-paren)
			 (arglist-close . c-lineup-arglist)
Barry A. Warsaw's avatar
Barry A. Warsaw committed
66
			 (inline-open . 0)
67
			 (brace-list-open . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
68 69
			 ))
     (c-special-indent-hook . c-gnu-impose-minimum)
Gerd Moellmann's avatar
Gerd Moellmann committed
70
     (c-block-comment-prefix . "")
Richard M. Stallman's avatar
Richard M. Stallman committed
71 72 73 74 75 76 77
     )
    ("k&r"
     (c-basic-offset . 5)
     (c-comment-only-line-offset . 0)
     (c-offsets-alist . ((statement-block-intro . +)
			 (knr-argdecl-intro . 0)
			 (substatement-open . 0)
78
			 (substatement-label . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
79 80 81 82 83
			 (label . 0)
			 (statement-cont . +)
			 ))
     )
    ("bsd"
84
     (c-basic-offset . 8)
Richard M. Stallman's avatar
Richard M. Stallman committed
85 86 87 88
     (c-comment-only-line-offset . 0)
     (c-offsets-alist . ((statement-block-intro . +)
			 (knr-argdecl-intro . +)
			 (substatement-open . 0)
89
			 (substatement-label . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
90 91
			 (label . 0)
			 (statement-cont . +)
Gerd Moellmann's avatar
Gerd Moellmann committed
92 93
			 (inline-open . 0)
			 (inexpr-class . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
94 95 96 97 98 99 100
			 ))
     )
    ("stroustrup"
     (c-basic-offset . 4)
     (c-comment-only-line-offset . 0)
     (c-offsets-alist . ((statement-block-intro . +)
			 (substatement-open . 0)
101
			 (substatement-label . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
102 103 104 105 106 107 108
			 (label . 0)
			 (statement-cont . +)
			 ))
     )
    ("whitesmith"
     (c-basic-offset . 4)
     (c-comment-only-line-offset . 0)
Gerd Moellmann's avatar
Gerd Moellmann committed
109
     (c-offsets-alist . ((knr-argdecl-intro . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
110 111
			 (label . 0)
			 (statement-cont . +)
Gerd Moellmann's avatar
Gerd Moellmann committed
112
			 (substatement-open . +)
113
			 (substatement-label . +)
Gerd Moellmann's avatar
Gerd Moellmann committed
114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134
			 (block-open . +)
			 (statement-block-intro . c-lineup-whitesmith-in-block)
			 (block-close . c-lineup-whitesmith-in-block)
			 (inline-open . +)
			 (defun-open . +)
			 (defun-block-intro . c-lineup-whitesmith-in-block)
			 (defun-close . c-lineup-whitesmith-in-block)
			 (brace-list-open . +)
			 (brace-list-intro . c-lineup-whitesmith-in-block)
			 (brace-entry-open . c-indent-multi-line-block)
			 (brace-list-close . c-lineup-whitesmith-in-block)
			 (class-open . +)
			 (inclass . c-lineup-whitesmith-in-block)
			 (class-close . +)
			 (inexpr-class . 0)
			 (extern-lang-open . +)
			 (inextern-lang . c-lineup-whitesmith-in-block)
			 (extern-lang-close . +)
			 (namespace-open . +)
			 (innamespace . c-lineup-whitesmith-in-block)
			 (namespace-close . +)
135 136 137 138 139 140
			 (module-open . +)
			 (inmodule . c-lineup-whitesmith-in-block)
			 (module-close . +)
			 (composition-open . +)
			 (incomposition . c-lineup-whitesmith-in-block)
			 (composition-close . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
141 142 143 144 145 146 147
			 ))
     )
    ("ellemtel"
     (c-basic-offset . 3)
     (c-comment-only-line-offset . 0)
     (c-hanging-braces-alist     . ((substatement-open before after)))
     (c-offsets-alist . ((topmost-intro        . 0)
148
			 (substatement         . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
149 150 151 152 153 154 155 156 157 158 159
			 (substatement-open    . 0)
                         (case-label           . +)
                         (access-label         . -)
                         (inclass              . ++)
                         (inline-open          . 0)
                         ))
     )
    ("linux"
     (c-basic-offset  . 8)
     (c-comment-only-line-offset . 0)
     (c-hanging-braces-alist . ((brace-list-open)
Barry A. Warsaw's avatar
Barry A. Warsaw committed
160
				(brace-entry-open)
Richard M. Stallman's avatar
Richard M. Stallman committed
161 162 163 164 165 166
				(substatement-open after)
				(block-close . c-snug-do-while)))
     (c-cleanup-list . (brace-else-brace))
     (c-offsets-alist . ((statement-block-intro . +)
			 (knr-argdecl-intro     . 0)
			 (substatement-open     . 0)
167
			 (substatement-label    . 0)
Richard M. Stallman's avatar
Richard M. Stallman committed
168 169 170 171 172 173
			 (label                 . 0)
			 (statement-cont        . +)
			 ))
     )
    ("python"
     (indent-tabs-mode . t)
Gerd Moellmann's avatar
Gerd Moellmann committed
174
     (fill-column      . 78)
Richard M. Stallman's avatar
Richard M. Stallman committed
175 176
     (c-basic-offset   . 8)
     (c-offsets-alist  . ((substatement-open . 0)
177 178 179
			  (inextern-lang . 0)
			  (arglist-intro . +)
			  (knr-argdecl-intro . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
180 181 182 183
			  ))
     (c-hanging-braces-alist . ((brace-list-open)
				(brace-list-intro)
				(brace-list-close)
Barry A. Warsaw's avatar
Barry A. Warsaw committed
184
				(brace-entry-open)
Richard M. Stallman's avatar
Richard M. Stallman committed
185 186 187
				(substatement-open after)
				(block-close . c-snug-do-while)
				))
Gerd Moellmann's avatar
Gerd Moellmann committed
188
     (c-block-comment-prefix . "")
Richard M. Stallman's avatar
Richard M. Stallman committed
189 190
     )
    ("java"
191
     (c-basic-offset . 4)
Richard M. Stallman's avatar
Richard M. Stallman committed
192
     (c-comment-only-line-offset . (0 . 0))
193
     ;; the following preserves Javadoc starter lines
194 195
     (c-offsets-alist . ((inline-open . 0)
			 (topmost-intro-cont    . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
196 197
			 (statement-block-intro . +)
 			 (knr-argdecl-intro     . 5)
198 199
			 (substatement-open     . +)
			 (substatement-label    . +)
Gerd Moellmann's avatar
Gerd Moellmann committed
200
 			 (label                 . +)
Richard M. Stallman's avatar
Richard M. Stallman committed
201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221
 			 (statement-case-open   . +)
 			 (statement-cont        . +)
 			 (arglist-intro  . c-lineup-arglist-intro-after-paren)
 			 (arglist-close  . c-lineup-arglist)
 			 (access-label   . 0)
			 (inher-cont     . c-lineup-java-inher)
			 (func-decl-cont . c-lineup-java-throws)
			 ))
     )
    )
  "Styles of indentation.
Elements of this alist are of the form:

  (STYLE-STRING [BASE-STYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...])

where STYLE-STRING is a short descriptive string used to select a
style, VARIABLE is any Emacs variable, and VALUE is the intended value
for that variable when using the selected style.

Optional BASE-STYLE if present, is a string and must follow
STYLE-STRING.  BASE-STYLE names a style that this style inherits from.
Gerd Moellmann's avatar
Gerd Moellmann committed
222
By default, all styles inherit from the \"user\" style, which is
Richard M. Stallman's avatar
Richard M. Stallman committed
223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245
computed at run time.  Style loops generate errors.

Two variables are treated specially.  When VARIABLE is
`c-offsets-alist', the VALUE is a list containing elements of the
form:

  (SYNTACTIC-SYMBOL . OFFSET)

as described in `c-offsets-alist'.  These are passed directly to
`c-set-offset' so there is no need to set every syntactic symbol in
your style, only those that are different from the default.

When VARIABLE is `c-special-indent-hook', its VALUE is added to
`c-special-indent-hook' using `add-hook'.  If VALUE is a list, each
element of the list is added with `add-hook'.

Do not change this variable directly.  Use the function `c-add-style'
to add new styles or modify existing styles (it is not a good idea to
modify existing styles -- you should create a new style that inherits
the existing style.")


;; Functions that manipulate styles
Gerd Moellmann's avatar
Gerd Moellmann committed
246
(defun c-set-style-1 (conscell dont-override)
Richard M. Stallman's avatar
Richard M. Stallman committed
247
  ;; Set the style for one variable
248 249
  ;;
  ;; This function does not do any hidden buffer changes.
Richard M. Stallman's avatar
Richard M. Stallman committed
250 251 252 253 254
  (let ((attr (car conscell))
	(val  (cdr conscell)))
    (cond
     ;; first special variable
     ((eq attr 'c-offsets-alist)
255 256 257 258 259 260 261 262 263 264
      (let ((offsets (cond ((eq dont-override t)
			    c-offsets-alist)
			   (dont-override
			    (default-value 'c-offsets-alist)))))
	(mapcar (lambda (langentry)
		  (let ((langelem (car langentry))
			(offset (cdr langentry)))
		    (unless (assq langelem offsets)
		      (c-set-offset langelem offset))))
		val)))
Richard M. Stallman's avatar
Richard M. Stallman committed
265 266
     ;; second special variable
     ((eq attr 'c-special-indent-hook)
267 268 269 270 271 272
      ;; Maybe we should ignore dont-override here and always add new
      ;; hooks?
      (unless (cond ((eq dont-override t)
		     c-special-indent-hook)
		    (dont-override
		     (default-value 'c-special-indent-hook)))
Gerd Moellmann's avatar
Gerd Moellmann committed
273
	(if (listp val)
274 275 276 277
	    (mapcar (lambda (func)
		      (add-hook 'c-special-indent-hook func t t))
		    val)
	  (add-hook 'c-special-indent-hook val t t))))
Richard M. Stallman's avatar
Richard M. Stallman committed
278
     ;; all other variables
279 280
     (t (when (or (not dont-override)
		  (not (memq attr c-style-variables))
281 282 283 284
		  (eq (if (eq dont-override t)
			  (symbol-value attr)
			(default-value attr))
		      'set-from-style))
285 286 287 288 289
	  (set attr val)
	  ;; Must update a number of other variables if
	  ;; c-comment-prefix-regexp is set.
	  (if (eq attr 'c-comment-prefix-regexp)
	      (c-setup-paragraph-variables)))))))
Richard M. Stallman's avatar
Richard M. Stallman committed
290

Gerd Moellmann's avatar
Gerd Moellmann committed
291 292
(defun c-get-style-variables (style basestyles)
  ;; Return all variables in a style by resolving inheritances.
293 294
  ;;
  ;; This function does not do any hidden buffer changes.
295 296 297 298 299 300 301 302 303 304 305 306
  (if (not style)
      (copy-alist c-fallback-style)
    (let ((vars (cdr (or (assoc (downcase style) c-style-alist)
			 (assoc (upcase style) c-style-alist)
			 (assoc style c-style-alist)
			 (progn
			   (c-benign-error "Undefined style: %s" style)
			   nil)))))
      (let ((base (and (stringp (car-safe vars))
		       (prog1
			   (downcase (car vars))
			 (setq vars (cdr vars))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
307
	(if (memq base basestyles)
308 309 310
	    (c-benign-error "Style loop detected: %s in %s" base basestyles)
	  (nconc (c-get-style-variables base (cons base basestyles))
		 (copy-alist vars)))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
311

Richard M. Stallman's avatar
Richard M. Stallman committed
312 313 314
(defvar c-set-style-history nil)

;;;###autoload
Gerd Moellmann's avatar
Gerd Moellmann committed
315
(defun c-set-style (stylename &optional dont-override)
Richard M. Stallman's avatar
Richard M. Stallman committed
316 317 318 319 320 321
  "Set CC Mode variables to use one of several different indentation styles.
STYLENAME is a string representing the desired style from the list of
styles described in the variable `c-style-alist'.  See that variable
for details of setting up styles.

The variable `c-indentation-style' always contains the buffer's current
Gerd Moellmann's avatar
Gerd Moellmann committed
322 323
style name.

324 325
If the optional argument DONT-OVERRIDE is t, no style variables that
already have values will be overridden.  I.e. in the case of
Gerd Moellmann's avatar
Gerd Moellmann committed
326 327 328 329
`c-offsets-alist', syntactic symbols will only be added, and in the
case of all other style variables, only those set to `set-from-style'
will be reassigned.

330 331 332 333 334 335 336 337 338 339 340
If DONT-OVERRIDE is neither nil nor t, only those style variables that
have default (i.e. non-buffer local) values will keep their settings
while the rest will be overridden.  This is useful to avoid overriding
global settings done in ~/.emacs when setting a style from a mode hook
\(providing the style variables are buffer local, which is the
default).

Obviously, setting DONT-OVERRIDE to t is useful mainly when the
initial style is chosen for a CC Mode buffer by a major mode.  Since
that is done internally by CC Mode, it typically won't have any effect
when used elsewhere."
341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
  (interactive
   (list (let ((completion-ignore-case t)
	       (prompt (format "Which %s indentation style? "
			       mode-name)))
	   (condition-case nil
	       ;; The default argument is preferred over
	       ;; initial-contents, but it only exists in Emacs >= 20
	       ;; and XEmacs >= 21.
	       (completing-read prompt c-style-alist nil t nil
				'c-set-style-history
				c-indentation-style)
	     (wrong-number-of-arguments
	      ;; If the call above failed, we fall back to the old way
	      ;; of specifying the default value.
	      (completing-read prompt c-style-alist nil t
			       (cons c-indentation-style 0)
			       'c-set-style-history))))))
358
  (c-initialize-builtin-style)
Gerd Moellmann's avatar
Gerd Moellmann committed
359
  (let ((vars (c-get-style-variables stylename nil)))
360 361 362 363 364 365 366 367
    (unless dont-override
      ;; Since we always add to c-special-indent-hook we must reset it
      ;; first, or else the hooks from the preceding style will
      ;; remain.  This is not necessary for c-offsets-alist, since
      ;; c-get-style-variables contains every valid offset type in the
      ;; fallback entry.
      (setq c-special-indent-hook
	    (default-value 'c-special-indent-hook)))
Gerd Moellmann's avatar
Gerd Moellmann committed
368 369 370
    (mapcar (lambda (elem)
	      (c-set-style-1 elem dont-override))
	    ;; Need to go through the variables backwards when we
371 372
	    ;; don't override any settings.
	    (if (eq dont-override t) (nreverse vars) vars)))
Richard M. Stallman's avatar
Richard M. Stallman committed
373 374 375 376
  (setq c-indentation-style stylename)
  (c-keep-region-active))

;;;###autoload
377
(defun c-add-style (style description &optional set-p)
Richard M. Stallman's avatar
Richard M. Stallman committed
378
  "Adds a style to `c-style-alist', or updates an existing one.
379 380
STYLE is a string identifying the style to add or update.  DESCRIPTION
is an association list describing the style and must be of the form:
Richard M. Stallman's avatar
Richard M. Stallman committed
381 382 383 384 385 386 387 388 389

  ([BASESTYLE] (VARIABLE . VALUE) [(VARIABLE . VALUE) ...])

See the variable `c-style-alist' for the semantics of BASESTYLE,
VARIABLE and VALUE.  This function also sets the current style to
STYLE using `c-set-style' if the optional SET-P flag is non-nil."
  (interactive
   (let ((stylename (completing-read "Style to add: " c-style-alist
				     nil nil nil 'c-set-style-history))
390 391
         (descr (eval-minibuffer "Style description: ")))
     (list stylename descr
Richard M. Stallman's avatar
Richard M. Stallman committed
392 393 394 395
	   (y-or-n-p "Set the style too? "))))
  (setq style (downcase style))
  (let ((s (assoc style c-style-alist)))
    (if s
396 397
        (setcdr s (copy-alist description)) ; replace
      (setq c-style-alist (cons (cons style description) c-style-alist))))
Richard M. Stallman's avatar
Richard M. Stallman committed
398 399 400 401 402 403 404 405
  (and set-p (c-set-style style)))


(defvar c-read-offset-history nil)

(defun c-read-offset (langelem)
  ;; read new offset value for LANGELEM from minibuffer. return a
  ;; legal value only
406 407
  ;;
  ;; This function does not do any hidden buffer changes.
Gerd Moellmann's avatar
Gerd Moellmann committed
408 409 410
  (let* ((oldoff  (cdr-safe (or (assq langelem c-offsets-alist)
				(assq langelem (get 'c-offsets-alist
						    'c-stylevar-fallback)))))
Barry A. Warsaw's avatar
Barry A. Warsaw committed
411 412
	 (symname (symbol-name langelem))
	 (defstr  (format "(default %s): " oldoff))
Gerd Moellmann's avatar
Gerd Moellmann committed
413
	 (errmsg  (concat "Offset must be int, func, var, vector, list, "
Barry A. Warsaw's avatar
Barry A. Warsaw committed
414 415 416
			  "or [+,-,++,--,*,/] "
			  defstr))
	 (prompt (concat symname " offset " defstr))
417 418 419 420 421 422 423 424
	 (keymap (make-sparse-keymap))
	 (minibuffer-completion-table obarray)
	 (minibuffer-completion-predicate 'fboundp)
	 offset input)
    ;; In principle completing-read is used here, but SPC is unbound
    ;; to make it less annoying to enter lists.
    (set-keymap-parent keymap minibuffer-local-completion-map)
    (define-key keymap " " 'self-insert-command)
Richard M. Stallman's avatar
Richard M. Stallman committed
425
    (while (not offset)
426 427 428 429 430 431 432 433 434
      (setq input (read-from-minibuffer prompt nil keymap t
					'c-read-offset-history
					(format "%s" oldoff)))
      (if (c-valid-offset input)
	  (setq offset input)
	;; error, but don't signal one, keep trying
	;; to read an input value
	(ding)
	(setq prompt errmsg)))
Richard M. Stallman's avatar
Richard M. Stallman committed
435 436
    offset))

437
;;;###autoload
Gerd Moellmann's avatar
Gerd Moellmann committed
438
(defun c-set-offset (symbol offset &optional ignored)
Richard M. Stallman's avatar
Richard M. Stallman committed
439 440
  "Change the value of a syntactic element symbol in `c-offsets-alist'.
SYMBOL is the syntactic element symbol to change and OFFSET is the new
Gerd Moellmann's avatar
Gerd Moellmann committed
441 442
offset for that syntactic element.  The optional argument is not used
and exists only for compatibility reasons."
Richard M. Stallman's avatar
Richard M. Stallman committed
443 444 445 446 447 448 449 450 451
  (interactive
   (let* ((langelem
	   (intern (completing-read
		    (concat "Syntactic symbol to change"
			    (if current-prefix-arg " or add" "")
			    ": ")
		    (mapcar
		     #'(lambda (langelem)
			 (cons (format "%s" (car langelem)) nil))
Gerd Moellmann's avatar
Gerd Moellmann committed
452
		     (get 'c-offsets-alist 'c-stylevar-fallback))
Richard M. Stallman's avatar
Richard M. Stallman committed
453 454 455 456
		    nil (not current-prefix-arg)
		    ;; initial contents tries to be the last element
		    ;; on the syntactic analysis list for the current
		    ;; line
457
		    (and c-buffer-is-cc-mode
458 459 460 461
			 (c-save-buffer-state
			     ((syntax (c-guess-basic-syntax))
			      (len (length syntax))
			      (ic (format "%s" (car (nth (1- len) syntax)))))
462
			   (cons ic 0)))
Richard M. Stallman's avatar
Richard M. Stallman committed
463 464 465 466
		    )))
	  (offset (c-read-offset langelem)))
     (list langelem offset current-prefix-arg)))
  ;; sanity check offset
467 468 469 470 471 472 473 474 475 476
  (if (c-valid-offset offset)
      (let ((entry (assq symbol c-offsets-alist)))
	(if entry
	    (setcdr entry offset)
	  (if (assq symbol (get 'c-offsets-alist 'c-stylevar-fallback))
	      (setq c-offsets-alist (cons (cons symbol offset)
					  c-offsets-alist))
	    (c-benign-error "%s is not a valid syntactic symbol" symbol))))
    (c-benign-error "Invalid indentation setting for symbol %s: %s"
		    symbol offset))
Richard M. Stallman's avatar
Richard M. Stallman committed
477 478
  (c-keep-region-active))

479 480 481 482 483

(defun c-setup-paragraph-variables ()
  "Fix things up for paragraph recognition and filling inside comments by
incorporating the value of `c-comment-prefix-regexp' in the relevant
variables."
484 485 486
  ;;
  ;; This function does not do any hidden buffer changes.

487 488 489 490 491 492 493 494
  (setq c-current-comment-prefix
	(if (listp c-comment-prefix-regexp)
	    (cdr-safe (or (assoc major-mode c-comment-prefix-regexp)
			  (assoc 'other c-comment-prefix-regexp)))
	  c-comment-prefix-regexp))
  (let ((comment-line-prefix
	 (concat "[ \t]*\\(" c-current-comment-prefix "\\)[ \t]*")))
    (setq paragraph-start (concat comment-line-prefix
495
				  c-paragraph-start
496 497 498
				  "\\|"
				  page-delimiter)
	  paragraph-separate (concat comment-line-prefix
499
				     c-paragraph-separate
500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
				     "\\|"
				     page-delimiter)
	  paragraph-ignore-fill-prefix t
	  adaptive-fill-mode t
	  adaptive-fill-regexp
	  (concat comment-line-prefix
		  (if (default-value 'adaptive-fill-regexp)
		      (concat "\\("
			      (default-value 'adaptive-fill-regexp)
			      "\\)")
		    "")))
    (when (boundp 'adaptive-fill-first-line-regexp)
      ;; XEmacs (20.x) adaptive fill mode doesn't have this.
      (make-local-variable 'adaptive-fill-first-line-regexp)
      (setq adaptive-fill-first-line-regexp
	    (concat "\\`" comment-line-prefix
		    ;; Maybe we should incorporate the old value here,
		    ;; but then we have to do all sorts of kludges to
		    ;; deal with the \` and \' it probably contains.
		    "\\'")))))


;; Helper for setting up Filladapt mode.  It's not used by CC Mode itself.

(cc-bytecomp-defvar filladapt-token-table)
(cc-bytecomp-defvar filladapt-token-match-table)
(cc-bytecomp-defvar filladapt-token-conversion-table)

(defun c-setup-filladapt ()
  "Convenience function to configure Kyle E. Jones' Filladapt mode for
CC Mode by making sure the proper entries are present on
`filladapt-token-table', `filladapt-token-match-table', and
`filladapt-token-conversion-table'.  This is intended to be used on
`c-mode-common-hook' or similar."
  ;; This function is intended to be used explicitly by the end user
  ;; only.
  ;;
537 538
  ;; This function does not do any hidden buffer changes.

539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559
  ;; The default configuration already handles C++ comments, but we
  ;; need to add handling of C block comments.  A new filladapt token
  ;; `c-comment' is added for that.
  (let (p)
    (setq p filladapt-token-table)
    (while (and p (not (eq (car-safe (cdr-safe (car-safe p))) 'c-comment)))
      (setq p (cdr-safe p)))
    (if p
	(setcar (car p) c-current-comment-prefix)
      (setq filladapt-token-table
	    (append (list (car filladapt-token-table)
			  (list c-current-comment-prefix 'c-comment))
		    (cdr filladapt-token-table)))))
  (unless (assq 'c-comment filladapt-token-match-table)
    (setq filladapt-token-match-table
	  (append '((c-comment c-comment))
		  filladapt-token-match-table)))
  (unless (assq 'c-comment filladapt-token-conversion-table)
    (setq filladapt-token-conversion-table
	  (append '((c-comment . exact))
		  filladapt-token-conversion-table))))
Barry A. Warsaw's avatar
Barry A. Warsaw committed
560

Gerd Moellmann's avatar
Gerd Moellmann committed
561

Richard M. Stallman's avatar
Richard M. Stallman committed
562 563 564 565 566
(defun c-initialize-builtin-style ()
  ;; Dynamically append the default value of most variables. This is
  ;; crucial because future c-set-style calls will always reset the
  ;; variables first to the `cc-mode' style before instituting the new
  ;; style.  Only do this once!
567 568
  ;;
  ;; This function does not do any hidden buffer changes.
Barry A. Warsaw's avatar
Barry A. Warsaw committed
569 570
  (unless (get 'c-initialize-builtin-style 'is-run)
    (put 'c-initialize-builtin-style 'is-run t)
Gerd Moellmann's avatar
Gerd Moellmann committed
571
    ;;(c-initialize-cc-mode)
572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587
    (unless (assoc "user" c-style-alist)
      (let ((vars c-style-variables) var val uservars)
	(while vars
	  (setq var (car vars)
		val (symbol-value var)
		vars (cdr vars))
	  (cond ((eq var 'c-offsets-alist)
		 (or (null val)
		     (setq uservars (cons (cons 'c-offsets-alist val)
					  uservars))))
		((not (eq val 'set-from-style))
		 (setq uservars (cons (cons var val)
				      uservars)))))
	(c-add-style "user" uservars)))
    (unless (assoc "cc-mode" c-style-alist)
      (c-add-style "cc-mode" '("user")))
Barry A. Warsaw's avatar
Barry A. Warsaw committed
588 589
    (if c-style-variables-are-local-p
	(c-make-styles-buffer-local))))
590

591
(defun c-make-styles-buffer-local (&optional this-buf-only-p)
Richard M. Stallman's avatar
Richard M. Stallman committed
592
  "Make all CC Mode style variables buffer local.
593 594 595 596 597 598 599 600 601 602
If `this-buf-only-p' is non-nil, the style variables will be made
buffer local only in the current buffer.  Otherwise they'll be made
permanently buffer local in any buffer that change their values.

The buffer localness of the style variables are normally controlled
with the variable `c-style-variables-are-local-p', so there's seldom
any reason to call this function directly."
  ;;
  ;; This function does not do any hidden buffer changes.

Richard M. Stallman's avatar
Richard M. Stallman committed
603
  ;; style variables
604 605 606
  (let ((func (if this-buf-only-p
		  'make-local-variable
		'make-variable-buffer-local))
Gerd Moellmann's avatar
Gerd Moellmann committed
607 608
	(varsyms (cons 'c-indentation-style (copy-alist c-style-variables))))
    (delq 'c-special-indent-hook varsyms)
609 610 611 612
    (mapcar func varsyms)
    ;; Hooks must be handled specially
    (if this-buf-only-p
	(make-local-hook 'c-special-indent-hook)
Gerd Moellmann's avatar
Gerd Moellmann committed
613 614
      (make-variable-buffer-local 'c-special-indent-hook)
      (setq c-style-variables-are-local-p t))
615 616
    ))

Richard M. Stallman's avatar
Richard M. Stallman committed
617 618


Gerd Moellmann's avatar
Gerd Moellmann committed
619
(cc-provide 'cc-styles)
620

Richard M. Stallman's avatar
Richard M. Stallman committed
621
;;; cc-styles.el ends here