1 ;;; cplus-md.el --- C++ code editing commands for Emacs
2 ;;; Copyright (C) 1985, 1992, 1994, 1995 Free Software Foundation, Inc.
4 ;; This file is part of GNU Emacs.
5 ;; Keywords: c languages oop
7 ;; GNU Emacs is free software; you can redistribute it and/or modify
8 ;; it under the terms of the GNU General Public License as published by
9 ;; the Free Software Foundation; either version 2, or (at your option)
12 ;; GNU Emacs is distributed in the hope that it will be useful,
13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ;; GNU General Public License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GNU Emacs; see the file COPYING. If not, write to
19 ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
20 ;; Maintainer: Dave Detlefs <dld@cs.cmu.edu>
25 ;; 1987 Dave Detlefs <dld@cs.cmu.edu>
26 ;; and Stewart Clamen <clamen@cs.cmu.edu>.
27 ;; Done by fairly faithful modification of:
31 ;; Feb, 1990 (Dave Detlefs, dld@cs.cmu.edu)
32 ;; Fixed electric-c++-terminator to handle double colons, at the
33 ;; request of John Hagerman.
35 ;; Jan, 1990 (Doug Lea, dl@oswego.edu)
36 ;; Replaced c++-comment-region and c++-uncomment-region with
37 ;; versions from Igor Metz that avoid potential infinite loops.
39 ;; Oct, 1989 (Dave Detlefs, dld@cs.cmu.edu)
40 ;; Added contribution from Igor Metz <metz@iam.unibe.ch>:
41 ;; functions c++-comment-region and c++-uncomment-region and
42 ;; corresponding key-binding.
43 ;; Also fixed bug in indentation of second line after an empty
44 ;; arglist with empty-arglist non-null.
46 ;; Sept, 1989 (Glen Ditchfield, gjditchfield@violet.uwaterloo.ca):
47 ;; Textual changes to more closely imitate Emacs 18.55's c-mode.
48 ;; Fixed handling of "default:", where ":" was the last character in the
49 ;; buffer. Fixed indentation of comments starting in column 0, and when
50 ;; previous line contained more than one comment start string. Fixed
51 ;; handling of "friend".
53 ;; Aug 7, 1989; John Hagerman (hagerman@ece.cmu.edu):
54 ;; Changed calculate-c++-indent to handle member initializations
55 ;; more flexibly. Two new variables are used to control behavior:
56 ;; c++-member-init-indent and c++-continued-member-init-offset.
57 ;; Note the assumption that member initializations and argument
58 ;; declarations are not mixed in one function definition.
60 ;; June 1989 (Dave Detlefs, dld@cs.cmu.edu)
61 ;; Fixed calculate-c++-indent to handle continued lines ending in
62 ;; {'s. (I wasn't following C-mode closely enough, or C-mode
63 ;; changed.) Made ' a quote character, at the behest of someone
64 ;; whose mail I apparently deleted (if they send me mail I'll credit
65 ;; them here in a future revision.)
66 ;; Dan Weinreb (dlw@odi.com) pointed out that 'c++-mode successively
67 ;; bound c++-indent-exp and c++-indent-defun to ESC-^q. ESC-^q is
68 ;; now bound to c++-indent-exp, while, c++-indent-defun is invoked
71 ;; February 1989 (Dave Detlefs, dld@cs.cmu.edu)
72 ;; Fixed some errors in c++-indent-defun, as pointed out by Sam
73 ;; Haradhvala (odi!sam@talcott.harvard.edu).
74 ;; October 1988 (Dave Detlefs, dld@cs.cmu.edu)
75 ;; It turns out I had only *thought* I had made
76 ;; beginning(end)-of-defun work. It should work better now -- you
77 ;; can either attempt to match defun headers "strongly," using a
78 ;; very complicated regexp, or "weakly," using a simple one. This
79 ;; is settable by a variable; the default is the cheaper weak
80 ;; method. (Stewart Clamen was intimately involved in this, too.)
82 ;; I made "'" *not* be a string delimiter, because that was causing
83 ;; comments containing contractions to ("// don't") to mess up paren
86 ;; I also incorporated another slight indentation fix from Glen
89 ;; We hope this is will make into version 19 of gnu-emacs.
91 ;; September 1988: incorporated changes from Fred Calm at Schlumberger.
92 ;; Also, made beginning(end)-of-defun, indent-defun work.
94 ;; August 1987: incorporated changes done by Glen Ditchfield of Waterloo.
98 (defvar c++-mode-abbrev-table nil
99 "Abbrev table used in C++ mode.")
100 (define-abbrev-table 'c++-mode-abbrev-table ())
102 (defvar c++-mode-map ()
103 "Keymap used in C++ mode.")
106 (setq c++-mode-map (make-sparse-keymap))
107 (define-key c++-mode-map "\C-j" 'reindent-then-newline-and-indent)
108 (define-key c++-mode-map "{" 'electric-c++-brace)
109 (define-key c++-mode-map "}" 'electric-c++-brace)
110 (define-key c++-mode-map ";" 'electric-c++-semi)
111 (define-key c++-mode-map "\e\C-h" 'mark-c-function)
112 (define-key c++-mode-map "\e\C-q" 'indent-c++-exp)
113 (define-key c++-mode-map "\177" 'backward-delete-char-untabify)
114 (define-key c++-mode-map "\t" 'c++-indent-command)
115 ;; (define-key c++-mode-map "\C-c\C-i" 'c++-insert-header)
116 (define-key c++-mode-map "\C-c\C-\\" 'c-backslash-region))
117 ;; (define-key c++-mode-map "\e\C-a" 'c++-beginning-of-defun)
118 ;; (define-key c++-mode-map "\e\C-e" 'c++-end-of-defun)
119 ;; (define-key c++-mode-map "\e\C-x" 'c++-indent-defun))
121 (defvar c++-mode-syntax-table nil
122 "Syntax table used in C++ mode.")
124 (if c++-mode-syntax-table
126 (setq c++-mode-syntax-table (copy-syntax-table c-mode-syntax-table))
127 (modify-syntax-entry ?* ". 23b" c++-mode-syntax-table)
128 (modify-syntax-entry ?/ ". 124" c++-mode-syntax-table)
129 (modify-syntax-entry ?\n ">" c++-mode-syntax-table)
130 (modify-syntax-entry ?\^m ">" c++-mode-syntax-table))
132 (defvar c++-continued-member-init-offset nil
133 "*Extra indent for continuation lines of member inits;
134 nil means to align with previous initializations rather than
135 with the colon on the first line.")
136 (defvar c++-member-init-indent 0
137 "*Indentation level of member initializations in function declarations.")
138 (defvar c++-friend-offset -4
139 "*Offset of C++ friend declarations relative to member declarations.")
140 (defvar c++-electric-colon t
141 "*If t, colon is an electric terminator.")
142 (defvar c++-empty-arglist-indent nil
143 "*Indicates how far to indent an line following an empty argument
144 list. Nil indicates to just after the paren.")
146 (defvar c++-imenu-generic-expression
151 "^" ; beginning of line is required
152 "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
153 "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no
154 "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right?
156 "\\(" ; last type spec including */&
158 "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace
159 "\\)?" ; if there is a last type spec
160 "\\(" ; name; take that into the imenu entry
161 "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor...
162 ; (may not contain * because then
163 ; "a::operator char*" would become "char*"!)
165 "\\([a-zA-Z0-9_:~]*::\\)?operator"
166 "[^a-zA-Z1-9_][^(]*" ; ...or operator
168 "[ \t]*([^)]*)[ \t\n]*[^ ;]" ; require something other than a ; after
169 ; the (...) to avoid prototypes. Can't
170 ; catch cases with () inside the parentheses
171 ; surrounding the parameters
172 ; (like "int foo(int a=bar()) {...}"
177 "^" ; beginning of line is required
178 "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
180 "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
183 ;; Example of generic expression for finding prototypes, structs, unions, enums.
184 ;; Uncomment if you want to find these too. It will be a bit slower gathering
189 ; "^" ; beginning of line is required
190 ; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>"
191 ; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no
192 ; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right?
194 ; "\\(" ; last type spec including */&
196 ; "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace
197 ; "\\)?" ; if there is a last type spec
198 ; "\\(" ; name; take that into the imenu entry
199 ; "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor...
200 ; ; (may not contain * because then
201 ; ; "a::operator char*" would become "char*"!)
203 ; "\\([a-zA-Z0-9_:~]*::\\)?operator"
204 ; "[^a-zA-Z1-9_][^(]*" ; ...or operator
206 ; "[ \t]*([^)]*)[ \t\n]*;" ; require ';' after
208 ; ; catch cases with () inside the parentheses
209 ; ; surrounding the parameters
210 ; ; (like "int foo(int a=bar());"
214 ; "^" ; beginning of line is required
215 ; "\\(static[ \t]+\\)?" ; there may be static or const.
216 ; "\\(const[ \t]+\\)?"
218 ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
223 ; "^" ; beginning of line is required
224 ; "\\(static[ \t]+\\)?" ; there may be static or const.
225 ; "\\(const[ \t]+\\)?"
227 ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
232 ; "^" ; beginning of line is required
233 ; "\\(static[ \t]+\\)?" ; there may be static or const.
234 ; "\\(const[ \t]+\\)?"
236 ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get
240 "Imenu generic expression for C++ mode. See `imenu-generic-expression'.")
243 "Major mode for editing C++ code. Very much like editing C code.
244 Expression and list commands understand all C++ brackets.
245 Tab at left margin indents for C++ code
246 Comments are delimited with /* ... */ {or with // ... <newline>}
247 Paragraphs are separated by blank lines only.
248 Delete converts tabs to spaces as it moves back.
250 Variables controlling indentation style:
252 Non-nil means TAB in C mode should always reindent the current line,
253 regardless of where in the line point is when the TAB command is used.
256 Non-nil means automatically newline before and after braces,
257 and after colons and semicolons, inserted in C code.
259 Indentation of C statements within surrounding block.
260 The surrounding block's indentation is the indentation
261 of the line on which the open-brace appears.
262 c-continued-statement-offset
263 Extra indentation given to a substatement, such as the
264 then-clause of an if or body of a while.
265 c-continued-brace-offset
266 Extra indentation given to a brace that starts a substatement.
267 This is in addition to c-continued-statement-offset.
269 Extra indentation for line if it starts with an open brace.
270 c-brace-imaginary-offset
271 An open brace following other text is treated as if it were
272 this far to the right of the start of its line.
274 Indentation level of declarations of C function arguments.
276 Extra indentation for line that is a label, or case or ``default:'', or
277 ``public:'' or ``private:'', or ``protected:''.
279 If non-nil at invocation of c++-mode (t is the default) colon electrically
281 c++-empty-arglist-indent
282 If non-nil, a function declaration or invocation which ends a line with a
283 left paren is indented this many extra spaces, instead of flush with the
286 Offset of C++ friend declarations relative to member declarations.
287 c++-member-init-indent
288 Indentation level of member initializations in function declarations,
289 if they are on a separate line beginning with a colon.
290 c++-continued-member-init-offset
291 Extra indentation for continuation lines of member initializations; NIL
292 means to align with previous initializations rather than with the colon.
294 Settings for K&R, BSD, and Stroustrup indentation styles are
296 c-continued-statement-offset 5 8 4
297 c-continued-brace-offset 0
298 c-brace-offset -5 -8 0
299 c-brace-imaginary-offset 0
300 c-argdecl-indent 0 8 4
301 c-label-offset -5 -8 -4
302 c++-empty-arglist-indent 4
305 Turning on C++ mode calls the value of the variable `c++-mode-hook' with
306 no args if that value is non-nil."
308 (kill-all-local-variables)
309 (use-local-map c++-mode-map)
310 (set-syntax-table c++-mode-syntax-table)
311 (setq major-mode 'c++-mode
314 local-abbrev-table c++-mode-abbrev-table)
315 (set (make-local-variable 'indent-line-function) 'c++-indent-line)
316 (set (make-local-variable 'comment-start) "// ")
317 (set (make-local-variable 'comment-end) "")
318 (set (make-local-variable 'comment-start-skip) "/\\*+ *\\|// *")
319 (set (make-local-variable 'comment-indent-function) 'c++-comment-indent)
320 (set (make-local-variable 'paragraph-start) (concat "$\\|" page-delimiter))
321 (set (make-local-variable 'paragraph-separate) paragraph-start)
322 (set (make-local-variable 'paragraph-ignore-fill-prefix) t)
323 (set (make-local-variable 'require-final-newline) t)
324 (set (make-local-variable 'parse-sexp-ignore-comments) t)
325 (make-local-variable 'imenu-generic-expression)
326 (setq imenu-generic-expression c++-imenu-generic-expression)
327 (run-hooks 'c++-mode-hook)
328 (if c++-electric-colon
329 (define-key c++-mode-map ":" 'electric-c++-terminator)))
331 ;; This is used by indent-for-comment
332 ;; to decide how much to indent a comment in C++ code
333 ;; based on its context.
334 (defun c++-comment-indent ()
335 (if (looking-at "^\\(/\\*\\|//\\)")
336 0 ; Existing comment at bol stays there.
338 (skip-chars-backward " \t")
340 ;; leave at least one space on non-empty lines.
341 (if (zerop (current-column)) 0 (1+ (current-column)))
342 (let ((cur-pt (point)))
343 (beginning-of-line 0)
344 ;; If previous line had a comment, use it's indent
345 (if (re-search-forward comment-start-skip cur-pt t)
347 (goto-char (match-beginning 0))
349 comment-column)))))) ; otherwise indent at comment column.
351 (defun electric-c++-brace (arg)
352 "Insert character and correct line's indentation."
358 (skip-chars-backward " \t")
360 (if c-auto-newline (progn (c++-indent-line) (newline) t))))
362 (insert last-command-char)
367 ;; (newline) may have done auto-fill
368 (setq insertpos (- (point) 2))
371 (if insertpos (goto-char (1+ insertpos)))
375 (goto-char insertpos)
376 (self-insert-command (prefix-numeric-value arg)))
377 (self-insert-command (prefix-numeric-value arg)))))
379 (defun electric-c++-semi (arg)
380 "Insert character and correct line's indentation."
383 (electric-c++-terminator arg)
384 (self-insert-command (prefix-numeric-value arg))))
386 (defun electric-c++-terminator (arg)
387 "Insert character and correct line's indentation."
389 (let (insertpos (end (point)))
390 (if (and (not arg) (eolp)
393 (skip-chars-forward " \t")
394 (or (= (following-char) ?#)
395 ;; Colon is special only after a label, or
396 ;; case, or another colon.
397 ;; So quickly rule out most other uses of colon
398 ;; and do no indentation for them.
399 (and (eq last-command-char ?:)
400 (or (not (or (looking-at "case[ \t]")
403 (skip-chars-forward " \t")
405 ;; Do re-indent double colons
411 (let ((pps (parse-partial-sexp (point) end)))
412 (or (nth 3 pps) (nth 4 pps) (nth 5 pps))))))))
414 (insert last-command-char)
417 (not (c-inside-parens-p))
419 ;; the new marker object, used to be just an integer
420 (setq insertpos (make-marker))
421 ;; changed setq to set-marker
422 (set-marker insertpos (1- (point)))
423 ;; do this before the newline, since in auto fill can break
427 (if insertpos (goto-char (1+ insertpos)))
431 (goto-char insertpos)
432 (self-insert-command (prefix-numeric-value arg)))
433 (self-insert-command (prefix-numeric-value arg)))))
435 (defun c++-indent-command (&optional whole-exp)
436 "Indent current line as C++ code, or in some cases insert a tab character.
437 If `c-tab-always-indent' is non-nil (the default), always indent current
438 line. Otherwise, indent the current line only if point is at the left
439 margin or in the line's indentation; otherwise insert a tab.
441 A numeric argument, regardless of its value, means indent rigidly all means
442 indent rigidly all the lines of the expression starting after point so that
443 this line becomes properly indented. The relative indentation among the
444 lines of the expression are preserved."
447 ;; If arg, always indent this line as C
448 ;; and shift remaining lines of expression the same amount.
449 (let ((shift-amt (c++-indent-line))
452 (if c-tab-always-indent
461 (indent-code-rigidly beg end shift-amt "#")))
462 (if (and (not c-tab-always-indent)
464 (skip-chars-backward " \t")
469 (defun c++-indent-line ()
470 "Indent current line as C++ code.
471 Return the amount the indentation changed by."
472 (let ((indent (calculate-c++-indent nil))
474 (case-fold-search nil)
475 (pos (- (point-max) (point))))
478 (cond ((eq indent nil)
479 (setq indent (current-indentation)))
481 (setq indent (calculate-c-indent-within-comment)))
482 ((looking-at "[ \t]*#")
485 (skip-chars-forward " \t")
486 (if (listp indent) (setq indent (car indent)))
487 (cond ((looking-at "\\(default\\|public\\|private\\|protected\\):")
488 (setq indent (+ indent c-label-offset)))
489 ((or (looking-at "case\\b")
490 (and (looking-at "[A-Za-z]")
493 (looking-at ":[^:]"))))
494 (setq indent (max 1 (+ indent c-label-offset))))
495 ((and (looking-at "else\\b")
496 (not (looking-at "else\\s_")))
497 (setq indent (save-excursion
498 (c-backward-to-start-of-if)
499 (current-indentation))))
500 ((looking-at "friend\[ \t]")
501 (setq indent (+ indent c++-friend-offset)))
502 ((= (following-char) ?})
503 (setq indent (- indent c-indent-level)))
504 ((= (following-char) ?{)
505 (setq indent (+ indent c-brace-offset))))))
506 (skip-chars-forward " \t")
507 (setq shift-amt (- indent (current-column)))
508 (if (zerop shift-amt)
509 (if (> (- (point-max) pos) (point))
510 (goto-char (- (point-max) pos)))
511 (delete-region beg (point))
513 ;; If initial point was within line's indentation,
514 ;; position after the indentation. Else stay at same point in text.
515 (if (> (- (point-max) pos) (point))
516 (goto-char (- (point-max) pos))))
519 (defun calculate-c++-indent (&optional parse-start)
520 "Return appropriate indentation for current line as C++ code.
521 In usual case returns an integer: the column to indent to.
522 Returns nil if line starts inside a string, t if in a comment."
525 (let ((indent-point (point))
526 (case-fold-search nil)
530 (goto-char parse-start)
531 (beginning-of-defun))
532 (while (< (point) indent-point)
533 (setq parse-start (point))
534 (setq state (parse-partial-sexp (point) indent-point 0))
535 (setq containing-sexp (car (cdr state))))
536 (cond ((or (nth 3 state) (nth 4 state))
537 ;; return nil or t if should not change this line
539 ((null containing-sexp)
540 ;; Line is at top level. May be data or function definition, or
541 ;; may be function argument declaration or member initialization.
542 ;; Indent like the previous top level line unless
543 ;; (1) the previous line ends in a closeparen without semicolon,
544 ;; in which case this line is the first argument declaration or
545 ;; member initialization, or
546 ;; (2) the previous line begins with a colon,
547 ;; in which case this is the second line of member inits.
548 ;; It is assumed that arg decls and member inits are not mixed.
549 (goto-char indent-point)
550 (skip-chars-forward " \t")
551 (if (= (following-char) ?{)
552 0 ; Unless it starts a function body
553 (c++-backward-to-noncomment (or parse-start (point-min)))
554 (if (= (preceding-char) ?\))
555 (progn ; first arg decl or member init
556 (goto-char indent-point)
557 (skip-chars-forward " \t")
558 (if (= (following-char) ?:)
559 c++-member-init-indent
561 (if (= (preceding-char) ?\;)
563 (if (= (preceding-char) ?})
565 (if (= (preceding-char) ?\))
567 (beginning-of-line) ; continued arg decls or member inits
568 (skip-chars-forward " \t")
569 (if (= (following-char) ?:)
570 (if c++-continued-member-init-offset
571 (+ (current-indentation)
572 c++-continued-member-init-offset)
575 (skip-chars-forward " \t")
577 (current-indentation)))
579 ((/= (char-after containing-sexp) ?{)
580 ;; line is expression, not statement:
581 ;; indent to just after the surrounding open -- unless
582 ;; empty arg list, in which case we do what
583 ;; c++-empty-arglist-indent says to do.
584 (if (and c++-empty-arglist-indent
585 (or (null (nth 2 state)) ;; indicates empty arg
587 ;; Use a heuristic: if the first
588 ;; non-whitespace following left paren on
589 ;; same line is not a comment,
590 ;; is not an empty arglist.
592 (goto-char (1+ containing-sexp))
594 (looking-at "\\( \\|\t\\)*[^/\n]")))))
596 (goto-char containing-sexp)
598 (skip-chars-forward " \t")
599 (goto-char (min (+ (point) c++-empty-arglist-indent)
600 (1+ containing-sexp)))
602 ;; In C-mode, we would always indent to one after the
603 ;; left paren. Here, though, we may have an
604 ;; empty-arglist, so we'll indent to the min of that
605 ;; and the beginning of the first argument.
606 (goto-char (1+ containing-sexp))
609 ;; Statement. Find previous non-comment character.
610 (goto-char indent-point)
611 (c++-backward-to-noncomment containing-sexp)
612 (if (and (not (memq (preceding-char) '(0 ?\, ?\; ?\} ?\{)))
613 ;; But don't treat a line with a close-brace
614 ;; as a continuation. It is probably the
615 ;; end of an enum type declaration.
617 (goto-char indent-point)
618 (skip-chars-forward " \t")
619 (not (= (following-char) ?}))))
620 ;; This line is continuation of preceding line's statement;
621 ;; indent c-continued-statement-offset more than the
622 ;; previous line of the statement.
624 (c-backward-to-start-of-continued-exp containing-sexp)
625 (+ c-continued-statement-offset (current-column)
626 (if (save-excursion (goto-char indent-point)
627 (skip-chars-forward " \t")
628 (eq (following-char) ?{))
629 c-continued-brace-offset 0)))
630 ;; This line starts a new statement.
631 ;; Position following last unclosed open.
632 (goto-char containing-sexp)
633 ;; Is line first statement after an open-brace?
635 ;; If no, find that first statement and indent like it.
638 (let ((colon-line-end 0))
639 (while (progn (skip-chars-forward " \t\n")
644 "\\|[a-zA-Z0-9_$]*:[^:]"
646 ;; Skip over comments and labels following openbrace.
647 (cond ((= (following-char) ?\#)
650 (search-forward "*/" nil 'move))
651 ((looking-at "//\\|friend[ \t]")
654 (save-excursion (end-of-line)
655 (setq colon-line-end (point)))
656 (search-forward ":"))))
657 ;; The first following code counts
658 ;; if it is before the line we want to indent.
659 (and (< (point) indent-point)
661 (if (> colon-line-end (point))
662 (- (current-indentation) c-label-offset)
664 ;; If prev stmt starts with open-brace, that
665 ;; open brace was offset by c-brace-offset.
666 ;; Compensate to get the column where
667 ;; an ordinary statement would start.
668 (if (= (following-char) ?\{) c-brace-offset 0)))))
669 ;; If no previous statement,
670 ;; indent it relative to line brace is on.
671 ;; For open brace in column zero, don't let statement
672 ;; start there too. If c-indent-offset is zero,
673 ;; use c-brace-offset + c-continued-statement-offset instead.
674 ;; For open-braces not the first thing in a line,
675 ;; add in c-brace-imaginary-offset.
676 (+ (if (and (bolp) (zerop c-indent-level))
677 (+ c-brace-offset c-continued-statement-offset)
679 ;; Move back over whitespace before the openbrace.
680 ;; If openbrace is not first nonwhite thing on the line,
681 ;; add the c-brace-imaginary-offset.
682 (progn (skip-chars-backward " \t")
683 (if (bolp) 0 c-brace-imaginary-offset))
684 ;; If the openbrace is preceded by a parenthesized exp,
685 ;; move to the beginning of that;
686 ;; possibly a different line
688 (if (eq (preceding-char) ?\))
690 ;; Get initial indentation of the line we are on.
691 (current-indentation))))))))))
693 (defun c++-backward-to-noncomment (lim)
696 (skip-chars-backward " \t\n\r\f" lim)
697 (setq opoint (point))
698 (cond ((and (>= (point) (+ 2 lim))
701 (looking-at "\\*/")))
702 (search-backward "/*" lim 'move))
704 (search-backward "//" (max (c++-point-bol) lim) 'move)
705 (not (c++-within-string-p (point) opoint))))
706 ;; No comment to be found.
707 ;; If there's a # command on this line,
709 (t (beginning-of-line)
710 (skip-chars-forward " \t")
711 ;; But don't get fooled if we are already before the #.
712 (if (and (looking-at "#") (< (point) opoint))
713 (setq stop (<= (point) lim))
715 (goto-char opoint)))))))
717 (defun indent-c++-exp ()
718 "Indent each line of the C++ grouping following point."
720 (let ((indent-stack (list nil))
721 (contain-stack (list (point)))
722 (case-fold-search nil)
723 restart outer-loop-done inner-loop-done state ostate
724 this-indent last-sexp last-depth
731 (setq outer-loop-done nil)
732 (while (and (not (eobp)) (not outer-loop-done))
733 (setq last-depth next-depth)
734 ;; Compute how depth changes over this line
735 ;; plus enough other lines to get to one that
736 ;; does not end inside a comment or string.
737 ;; Meanwhile, do appropriate indentation on comment lines.
738 (setq inner-loop-done nil)
739 (while (and (not inner-loop-done)
740 (not (and (eobp) (setq outer-loop-done t))))
742 (setq state (parse-partial-sexp (point) (progn (end-of-line) (point))
744 (setq next-depth (car state))
745 (if (and (car (cdr (cdr state)))
746 (>= (car (cdr (cdr state))) 0))
747 (setq last-sexp (car (cdr (cdr state)))))
748 (if (or (nth 4 ostate))
750 (if (or (nth 3 state))
752 (setq inner-loop-done t)))
753 (if (<= next-depth 0)
754 (setq outer-loop-done t))
757 ;; If this line had ..))) (((.. in it, pop out of the levels
758 ;; that ended anywhere in this line, even if the final depth
759 ;; doesn't indicate that they ended.
760 (while (> last-depth (nth 6 state))
761 (setq indent-stack (cdr indent-stack)
762 contain-stack (cdr contain-stack)
763 last-depth (1- last-depth)))
764 (if (/= last-depth next-depth)
765 (setq last-sexp nil))
766 ;; Add levels for any parens that were started in this line.
767 (while (< last-depth next-depth)
768 (setq indent-stack (cons nil indent-stack)
769 contain-stack (cons nil contain-stack)
770 last-depth (1+ last-depth)))
771 (if (null (car contain-stack))
772 (setcar contain-stack (or (car (cdr state))
773 (save-excursion (forward-sexp -1)
776 (skip-chars-forward " \t")
779 (if (and (car indent-stack)
780 (>= (car indent-stack) 0))
781 ;; Line is on an existing nesting level.
782 ;; Lines inside parens are handled specially.
784 ;; Just started a new nesting level.
785 ;; Compute the standard indent for this level.
787 (if (= (char-after (car contain-stack)) ?{)
789 (goto-char (car contain-stack))
790 (setq val (+ c-indent-level (current-column))))
791 (setq val (calculate-c++-indent
792 (if (car indent-stack)
793 (- (car indent-stack))))))
794 (setcar indent-stack val)))
795 ;; Adjust line indentation according to its predecessor.
796 (if (/= (char-after (car contain-stack)) ?\{)
797 (setq this-indent (car indent-stack))
798 ;; Line is at statement level.
799 ;; Is it a new statement? Is it an else?
800 ;; Find last non-comment character before this line
802 (setq at-else (looking-at "else\\W"))
803 (setq at-brace (= (following-char) ?\{))
804 (c++-backward-to-noncomment opoint)
805 (if (not (memq (preceding-char) '(nil ?\, ?\; ?\} ?: ?\{)))
806 ;; Preceding line did not end in comma or semi;
807 ;; indent this line c-continued-statement-offset
808 ;; more than previous.
810 (c-backward-to-start-of-continued-exp
813 (+ c-continued-statement-offset
815 (if at-brace c-continued-brace-offset 0))))
816 ;; Preceding line ended in comma or semi;
817 ;; use the standard indent for this level.
819 (progn (c-backward-to-start-of-if opoint)
820 (setq this-indent (current-indentation)))
821 (setq this-indent (car indent-stack))))))
822 ;; Adjust line indentation according to its contents
823 (if (looking-at "\\(public\\|private\\|protected\\):")
824 (setq this-indent (- this-indent c-indent-level))
825 (if (or (looking-at "case[ \t]")
826 (and (looking-at "[A-Za-z]")
829 (looking-at ":[^:]"))))
830 (setq this-indent (max 1 (+ this-indent c-label-offset)))))
831 (if (looking-at "friend[ \t]")
832 (setq this-indent (+ this-indent c++-friend-offset)))
833 (if (= (following-char) ?\})
834 (setq this-indent (- this-indent c-indent-level)))
835 (if (= (following-char) ?\{)
836 (setq this-indent (+ this-indent c-brace-offset)))
837 ;; Put chosen indentation into effect.
838 (or (= (current-column) this-indent)
839 (= (following-char) ?\#)
841 (delete-region (point) (progn (beginning-of-line) (point)))
842 (indent-to this-indent)))
843 ;; Indent any comment following the text.
844 (or (looking-at comment-start-skip)
845 (if (re-search-forward comment-start-skip
846 (save-excursion (end-of-line)
850 (beginning-of-line))))))))))
852 (defun fill-c++-comment ()
853 "Fill a comment contained in consecutive lines containing point.
854 The fill lines remain a comment."
857 (let ((save fill-prefix))
858 (beginning-of-line 1)
860 (re-search-forward comment-start-skip
861 (save-excursion (end-of-line) (point))
863 (goto-char (match-end 0))
865 (while (looking-at fill-prefix)
871 (setq fill-prefix save))))
873 (defun c++-point-bol ()
874 "Returns the value of the point at the beginning of the current line."
879 ;; (defun c++-insert-header ()
880 ;; "Insert header denoting C++ code at top of buffer."
883 ;; (goto-char (point-min))
885 ;; "This may look like C code, but it is really "
889 (defun c++-within-string-p (point1 point2)
890 "Returns true if number of double quotes between two points is odd."
891 (let ((s (buffer-substring point1 point2)))
892 (not (zerop (% (c++-count-char-in-string ?\" s) 2)))))
894 (defun c++-count-char-in-string (c s)
897 (while (< pos (length s))
898 (setq count (+ count (if (\= (aref s pos) c) 1 0)))
902 ;; rms: This page is creeping featurism, and not worth having.
904 ;;; Below are two regular expressions that attempt to match defuns
905 ;;; "strongly" and "weakly." The strong one almost reconstructs the
906 ;;; grammar of C++; the weak one just figures anything id or curly on
907 ;;; the left begins a defun. The constant "c++-match-header-strongly"
908 ;;; determines which to use; the default is the weak one.
910 ;; (defvar c++-match-header-strongly nil
911 ;; "*If nil, use `c++-defun-header-weak' to identify beginning of definitions.
912 ;; If non-nil, use `c++-defun-header-strong'.")
914 ;; (defvar c++-defun-header-strong-struct-equivs "\\(class\\|struct\\|enum\\)"
915 ;; "Regexp to match names of structure declaration blocks in C++.")
917 ;; (defconst c++-defun-header-strong
919 ;; (; valid identifiers
920 ;; ;; There's a real weirdness here -- if I switch the below
921 ;; (id "\\(\\w\\|_\\)+")
923 ;; ;; (id "\\(_\\|\\w\\)+")
924 ;; ;; things no longer work right. Try it and see!
926 ;; ; overloadable operators
928 ;; "[-+*/%^&|~!=<>]\\|[-+*/%^&|<>=!]=\\|<<=?\\|>>=?")
930 ;; "&&\\|||\\|\\+\\+\\|--\\|()\\|\\[\\]")
931 ;; (op-sym (concat "\\(" op-sym1 "\\|" op-sym2 "\\)"))
933 ;; (middle "[^\\*]*\\(\\*+[^/\\*][^\\*]*\\)*")
934 ;; (c-comment (concat "/\\*" middle "\\*+/"))
935 ;; (wh (concat "\\(\\s \\|\n\\|//.*$\\|" c-comment "\\)"))
936 ;; (wh-opt (concat wh "*"))
937 ;; (wh-nec (concat wh "+"))
938 ;; (oper (concat "\\(" "operator" "\\("
939 ;; wh-opt op-sym "\\|" wh-nec id "\\)" "\\)"))
940 ;; (dcl-list "([^():]*)")
941 ;; (func-name (concat "\\(" oper "\\|" id "::" id "\\|" id "\\)"))
944 ;; "\\(" wh-opt id "(.*\\()" wh-opt "," "\\)\\)*"
945 ;; wh-opt id "(.*)" wh-opt "{"
946 ;; "\\|" wh-opt "{\\)"))
947 ;; (type-name (concat
948 ;; "\\(" c++-defun-header-strong-struct-equivs wh-nec "\\)?"
950 ;; (type (concat "\\(const" wh-nec "\\)?"
951 ;; "\\(" type-name "\\|" type-name wh-opt "\\*+" "\\|"
952 ;; type-name wh-opt "&" "\\)"))
953 ;; (modifier "\\(inline\\|virtual\\|overload\\|auto\\|static\\)")
954 ;; (modifiers (concat "\\(" modifier wh-nec "\\)*"))
957 ;; (concat modifiers type wh-nec func-name wh-opt dcl-list wh-opt inits))
958 ;; (inherit (concat "\\(:" wh-opt "\\(public\\|private\\)?"
960 ;; (cs-header (concat
961 ;; c++-defun-header-strong-struct-equivs
962 ;; wh-nec id wh-opt inherit "?" wh-opt "{")))
963 ;; (concat "^\\(" func-header "\\|" cs-header "\\)"))
964 ;; "Strongly-defined regexp to match beginning of structure or function def.")
967 ;; ;; This part has to do with recognizing defuns.
969 ;; ;; The weak convention we will use is that a defun begins any time
970 ;; ;; there is a left curly brace, or some identifier on the left margin,
971 ;; ;; followed by a left curly somewhere on the line. (This will also
972 ;; ;; incorrectly match some continued strings, but this is after all
973 ;; ;; just a weak heuristic.) Suggestions for improvement (short of the
974 ;; ;; strong scheme shown above) are welcomed.
976 ;; (defconst c++-defun-header-weak "^{\\|^[_a-zA-Z].*{"
977 ;; "Weakly-defined regexp to match beginning of structure or function def.")
979 ;; (defun c++-beginning-of-defun (arg)
981 ;; (let ((c++-defun-header (if c++-match-header-strongly
982 ;; c++-defun-header-strong
983 ;; c++-defun-header-weak)))
984 ;; (cond ((or (= arg 0) (and (> arg 0) (bobp))) nil)
985 ;; ((and (not (looking-at c++-defun-header))
986 ;; (let ((curr-pos (point))
987 ;; (open-pos (if (search-forward "{" nil 'move)
990 ;; (if (re-search-backward c++-defun-header nil 'move)
991 ;; (match-beginning 0))))
992 ;; (if (and open-pos beg-pos
993 ;; (< beg-pos curr-pos)
994 ;; (> open-pos curr-pos))
996 ;; (goto-char beg-pos)
997 ;; (if (= arg 1) t nil));; Are we done?
998 ;; (goto-char curr-pos)
1001 ;; (if (and (looking-at c++-defun-header) (not (bobp)))
1002 ;; (forward-char (if (< arg 0) 1 -1)))
1003 ;; (and (re-search-backward c++-defun-header nil 'move (or arg 1))
1004 ;; (goto-char (match-beginning 0)))))))
1007 ;; (defun c++-end-of-defun (arg)
1008 ;; (interactive "p")
1009 ;; (let ((c++-defun-header (if c++-match-header-strongly
1010 ;; c++-defun-header-strong
1011 ;; c++-defun-header-weak)))
1012 ;; (if (and (eobp) (> arg 0))
1014 ;; (if (and (> arg 0) (looking-at c++-defun-header)) (forward-char 1))
1015 ;; (let ((pos (point)))
1016 ;; (c++-beginning-of-defun
1018 ;; (- (- arg (if (eobp) 0 1)))
1020 ;; (if (and (< arg 0) (bobp))
1022 ;; (if (re-search-forward c++-defun-header nil 'move)
1023 ;; (progn (forward-char -1)
1025 ;; (beginning-of-line 2)))
1026 ;; (if (and (= pos (point))
1027 ;; (re-search-forward c++-defun-header nil 'move))
1028 ;; (c++-end-of-defun 1))))
1031 ;; (defun c++-indent-defun ()
1032 ;; "Indents the current function definition, struct or class declaration."
1034 ;; (let ((restore (point)))
1035 ;; (c++-end-of-defun 1)
1036 ;; (beginning-of-line 1)
1037 ;; (let ((end (point)))
1038 ;; (c++-beginning-of-defun 1)
1039 ;; (while (<= (point) end)
1040 ;; (c++-indent-line)
1042 ;; (beginning-of-line 1)))
1043 ;; (goto-char restore)))
1045 ;;; cplus-md.el ends here