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c0274f38 | 1 | ;;; c-mode.el --- C code editing commands for Emacs |
b578f267 | 2 | |
732be465 | 3 | ;; Copyright (C) 1985, 86, 87, 92, 94, 95 Free Software Foundation, Inc. |
3a801d0c | 4 | |
e5167999 | 5 | ;; Maintainer: FSF |
e5167999 ER |
6 | ;; Keywords: c |
7 | ||
a17915dc ER |
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 | |
e5167999 | 12 | ;; the Free Software Foundation; either version 2, or (at your option) |
a17915dc ER |
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 | |
b578f267 EN |
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. | |
a17915dc | 24 | |
e41b2db1 ER |
25 | ;;; Commentary: |
26 | ||
27 | ;; A smart editing mode for C code. It knows a lot about C syntax and tries | |
732be465 | 28 | ;; to position the cursor according to C layout conventions. You can |
e41b2db1 ER |
29 | ;; change the details of the layout style with option variables. Load it |
30 | ;; and do M-x describe-mode for details. | |
31 | ||
e5167999 | 32 | ;;; Code: |
e4df16d0 SE |
33 | (defgroup old-c nil |
34 | "Old C code editing commands for Emacs." | |
39fc56c9 KH |
35 | ;; This group should have no parent. |
36 | ;; We don't want it to be loaded except on explicit request. | |
37 | :prefix "c-") | |
e4df16d0 | 38 | |
a17915dc ER |
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 | ||
885020c5 | 44 | (defvar c-mode-map (make-sparse-keymap) |
a17915dc | 45 | "Keymap used in C mode.") |
885020c5 RS |
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) | |
885020c5 RS |
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) | |
9a474b25 | 60 | (define-key c-mode-map "\t" 'c-indent-command) |
885020c5 RS |
61 | |
62 | (define-key c-mode-map [menu-bar] (make-sparse-keymap)) | |
63 | ||
c5c170d0 RS |
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. | |
885020c5 | 67 | (define-key c-mode-map [menu-bar c] |
c5c170d0 | 68 | (cons "C-mode" (make-sparse-keymap "C-mode"))) |
885020c5 | 69 | |
1a2ac388 RS |
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)) | |
885020c5 RS |
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)) | |
c814718b RS |
82 | (define-key c-mode-map [menu-bar c cpp-highlight-buffer] |
83 | '("Highlight Conditionals" . cpp-highlight-buffer)) | |
885020c5 RS |
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)) | |
a17915dc | 94 | |
d73ecf45 SM |
95 | (put 'comment-region 'menu-enable 'mark-active) |
96 | (put 'c-macro-expand 'menu-enable 'mark-active) | |
c6b3c155 | 97 | (put 'c-backslash-region 'menu-enable 'mark-active) |
d73ecf45 | 98 | |
a17915dc ER |
99 | (autoload 'c-macro-expand "cmacexp" |
100 | "Display the result of expanding all C macros occurring in the region. | |
101 | The 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 | ||
e4df16d0 SE |
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 | |
a17915dc | 148 | "*Extra indent for substatements that start with open-braces. |
e4df16d0 SE |
149 | This is in addition to `c-continued-statement-offset'." |
150 | :type 'integer | |
151 | :group 'old-c) | |
a17915dc ER |
152 | (defconst c-style-alist |
153 | '(("GNU" | |
154 | (c-indent-level . 2) | |
155 | (c-argdecl-indent . 5) | |
156 | (c-brace-offset . 0) | |
02da8c82 | 157 | (c-continued-brace-offset . 0) |
a17915dc ER |
158 | (c-label-offset . -2) |
159 | (c-continued-statement-offset . 2)) | |
160 | ("K&R" | |
161 | (c-indent-level . 5) | |
162 | (c-argdecl-indent . 0) | |
02da8c82 KH |
163 | (c-brace-offset . 0) |
164 | (c-continued-brace-offset . -5) | |
a17915dc ER |
165 | (c-label-offset . -5) |
166 | (c-continued-statement-offset . 5)) | |
167 | ("BSD" | |
168 | (c-indent-level . 4) | |
169 | (c-argdecl-indent . 4) | |
02da8c82 | 170 | (c-brace-offset . 0) |
e7e7be7c | 171 | (c-continued-brace-offset . -4) |
a17915dc ER |
172 | (c-label-offset . -4) |
173 | (c-continued-statement-offset . 4)) | |
ce4b7b02 | 174 | ("C++" |
02da8c82 KH |
175 | (c-indent-level . 4) |
176 | (c-argdecl-indent . 0) | |
177 | (c-brace-offset . 0) | |
178 | (c-continued-brace-offset . -4) | |
2b529dd2 | 179 | (c-label-offset . -4) |
02da8c82 KH |
180 | (c-continued-statement-offset . 4) |
181 | (c-auto-newline . t)) | |
a17915dc ER |
182 | ("Whitesmith" |
183 | (c-indent-level . 4) | |
184 | (c-argdecl-indent . 4) | |
185 | (c-brace-offset . 0) | |
02da8c82 | 186 | (c-continued-brace-offset . 0) |
a17915dc ER |
187 | (c-label-offset . -4) |
188 | (c-continued-statement-offset . 4)))) | |
189 | ||
e4df16d0 | 190 | (defcustom c-auto-newline nil |
a17915dc ER |
191 | "*Non-nil means automatically newline before and after braces, |
192 | and after colons and semicolons, inserted in C code. | |
193 | If you do not want a leading newline before braces then use: | |
e4df16d0 SE |
194 | (define-key c-mode-map \"{\" 'electric-c-semi)" |
195 | :type 'boolean | |
196 | :group 'old-c) | |
a17915dc | 197 | |
e4df16d0 | 198 | (defcustom c-tab-always-indent t |
a17915dc | 199 | "*Non-nil means TAB in C mode should always reindent the current line, |
e4df16d0 SE |
200 | regardless of where in the line point is when the TAB command is used." |
201 | :type 'boolean | |
202 | :group 'old-c) | |
3a65941e JB |
203 | |
204 | ;;; Regular expression used internally to recognize labels in switch | |
205 | ;;; statements. | |
0ce62eb2 | 206 | (defconst c-switch-label-regexp "case[ \t'/(]\\|default[ \t]*:") |
3a65941e | 207 | |
82af06af KH |
208 | ;; This is actually the expression for C++ mode, but it's used for C too. |
209 | (defvar c-imenu-generic-expression | |
f95f9d2b | 210 | (` |
82af06af | 211 | ((nil |
f95f9d2b | 212 | (, |
82af06af KH |
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? | |
f95f9d2b | 218 | |
82af06af KH |
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... | |
f95f9d2b | 225 | ; (may not contain * because then |
82af06af KH |
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()) {...}" | |
f95f9d2b RM |
236 | |
237 | )) 6) | |
238 | ("Class" | |
239 | (, (concat | |
82af06af KH |
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" | |
f95f9d2b | 250 | ; (, |
82af06af KH |
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? | |
f95f9d2b | 256 | |
82af06af KH |
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... | |
f95f9d2b | 263 | ; ; (may not contain * because then |
82af06af KH |
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 | |
f95f9d2b RM |
273 | ; ; (like "int foo(int a=bar());" |
274 | ; )) 6) | |
82af06af KH |
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'.") | |
a17915dc | 304 | \f |
a17915dc ER |
305 | (defun c-mode () |
306 | "Major mode for editing C code. | |
307 | Expression and list commands understand all C brackets. | |
308 | Tab indents for C code. | |
309 | Comments are delimited with /* ... */. | |
310 | Paragraphs are separated by blank lines only. | |
311 | Delete converts tabs to spaces as it moves back. | |
312 | \\{c-mode-map} | |
313 | Variables 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 | ||
340 | Settings 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 | ||
347 | Turning on C mode calls the value of the variable c-mode-hook with no args, | |
348 | if 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) | |
52af0e47 | 357 | (setq paragraph-start (concat "$\\|" page-delimiter)) |
a17915dc ER |
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) | |
fcf9745f RS |
362 | (make-local-variable 'fill-paragraph-function) |
363 | (setq fill-paragraph-function 'c-fill-paragraph) | |
a17915dc ER |
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) | |
bd133320 RS |
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) | |
a17915dc ER |
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-column) | |
379 | (setq comment-column 32) | |
380 | (make-local-variable 'comment-start-skip) | |
381 | (setq comment-start-skip "/\\*+ *") | |
e41b2db1 ER |
382 | (make-local-variable 'comment-indent-function) |
383 | (setq comment-indent-function 'c-comment-indent) | |
752e8dd9 RS |
384 | (make-local-variable 'comment-multi-line) |
385 | (setq comment-multi-line t) | |
a17915dc ER |
386 | (make-local-variable 'parse-sexp-ignore-comments) |
387 | (setq parse-sexp-ignore-comments t) | |
82af06af KH |
388 | (make-local-variable 'imenu-generic-expression) |
389 | (setq imenu-generic-expression c-imenu-generic-expression) | |
c0b08eb0 | 390 | (setq imenu-case-fold-search nil) |
a17915dc | 391 | (run-hooks 'c-mode-hook)) |
bd133320 RS |
392 | |
393 | (defun c-outline-level () | |
f87880f5 DL |
394 | ;; This so that `current-column' DTRT in otherwise-hidden text. |
395 | (let (buffer-invisibility-spec) | |
396 | (save-excursion | |
397 | (skip-chars-forward "\t ") | |
398 | (current-column)))) | |
a17915dc ER |
399 | \f |
400 | ;; This is used by indent-for-comment | |
401 | ;; to decide how much to indent a comment in C code | |
402 | ;; based on its context. | |
403 | (defun c-comment-indent () | |
404 | (if (looking-at "^/\\*") | |
405 | 0 ;Existing comment at bol stays there. | |
406 | (let ((opoint (point))) | |
407 | (save-excursion | |
408 | (beginning-of-line) | |
409 | (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)") | |
410 | ;; A comment following a solitary close-brace | |
411 | ;; should have only one space. | |
412 | (search-forward "}") | |
413 | (1+ (current-column))) | |
414 | ((or (looking-at "^#[ \t]*endif[ \t]*") | |
415 | (looking-at "^#[ \t]*else[ \t]*")) | |
416 | 7) ;2 spaces after #endif | |
417 | ((progn | |
418 | (goto-char opoint) | |
419 | (skip-chars-backward " \t") | |
420 | (and (= comment-column 0) (bolp))) | |
421 | ;; If comment-column is 0, and nothing but space | |
422 | ;; before the comment, align it at 0 rather than 1. | |
423 | 0) | |
424 | (t | |
425 | (max (1+ (current-column)) ;Else indent at comment column | |
426 | comment-column))))))) ; except leave at least one space. | |
427 | ||
428 | (defun c-fill-paragraph (&optional arg) | |
429 | "Like \\[fill-paragraph] but handle C comments. | |
c9c56492 RS |
430 | If any of the current line is a comment or within a comment, |
431 | fill the comment or the paragraph of it that point is in, | |
432 | preserving the comment indentation or line-starting decorations." | |
a17915dc | 433 | (interactive "P") |
6cf42072 RS |
434 | (let* (comment-start-place |
435 | (first-line | |
436 | ;; Check for obvious entry to comment. | |
437 | (save-excursion | |
438 | (beginning-of-line) | |
8931ecc0 | 439 | (skip-chars-forward " \t\n") |
6cf42072 RS |
440 | (and (looking-at comment-start-skip) |
441 | (setq comment-start-place (point)))))) | |
0fef40c0 RS |
442 | (if (and (eq major-mode 'c++-mode) |
443 | (save-excursion | |
444 | (beginning-of-line) | |
445 | (looking-at ".*//"))) | |
446 | (let (fill-prefix | |
a17915dc ER |
447 | (paragraph-start |
448 | ;; Lines containing just a comment start or just an end | |
449 | ;; should not be filled into paragraphs they are next to. | |
f95f9d2b | 450 | (concat |
dbc4e1c1 | 451 | paragraph-start |
52af0e47 | 452 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
a17915dc | 453 | (paragraph-separate |
dbc4e1c1 JB |
454 | (concat |
455 | paragraph-separate | |
52af0e47 | 456 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))) |
0fef40c0 RS |
457 | (save-excursion |
458 | (beginning-of-line) | |
459 | ;; Move up to first line of this comment. | |
460 | (while (and (not (bobp)) (looking-at "[ \t]*//")) | |
461 | (forward-line -1)) | |
462 | (if (not (looking-at ".*//")) | |
463 | (forward-line 1)) | |
464 | ;; Find the comment start in this line. | |
465 | (re-search-forward "[ \t]*//[ \t]*") | |
466 | ;; Set the fill-prefix to be what all lines except the first | |
467 | ;; should start with. | |
468 | (let ((endcol (current-column))) | |
469 | (skip-chars-backward " \t") | |
470 | (setq fill-prefix | |
471 | (concat (make-string (- (current-column) 2) ?\ ) | |
472 | "//" | |
473 | (make-string (- endcol (current-column)) ?\ )))) | |
474 | (save-restriction | |
475 | ;; Narrow down to just the lines of this comment. | |
476 | (narrow-to-region (point) | |
477 | (save-excursion | |
478 | (forward-line 1) | |
c9a73a9b | 479 | (while (looking-at "[ \t]*//") |
0fef40c0 RS |
480 | (forward-line 1)) |
481 | (point))) | |
482 | (insert fill-prefix) | |
483 | (fill-paragraph arg) | |
484 | (delete-region (point-min) | |
485 | (+ (point-min) (length fill-prefix)))))) | |
486 | (if (or first-line | |
487 | ;; t if we enter a comment between start of function and this line. | |
488 | (eq (calculate-c-indent) t) | |
489 | ;; t if this line contains a comment starter. | |
490 | (setq first-line | |
491 | (save-excursion | |
492 | (beginning-of-line) | |
493 | (prog1 | |
494 | (re-search-forward comment-start-skip | |
495 | (save-excursion (end-of-line) | |
496 | (point)) | |
497 | t) | |
498 | (setq comment-start-place (point)))))) | |
499 | ;; Inside a comment: fill one comment paragraph. | |
500 | (let ((fill-prefix | |
501 | ;; The prefix for each line of this paragraph | |
502 | ;; is the appropriate part of the start of this line, | |
503 | ;; up to the column at which text should be indented. | |
504 | (save-excursion | |
505 | (beginning-of-line) | |
506 | (if (looking-at "[ \t]*/\\*.*\\*/") | |
507 | (progn (re-search-forward comment-start-skip) | |
508 | (make-string (current-column) ?\ )) | |
509 | (if first-line (forward-line 1)) | |
510 | ||
511 | (let ((line-width (progn (end-of-line) (current-column)))) | |
512 | (beginning-of-line) | |
513 | (prog1 | |
514 | (buffer-substring | |
515 | (point) | |
516 | ||
517 | ;; How shall we decide where the end of the | |
518 | ;; fill-prefix is? | |
519 | ;; calculate-c-indent-within-comment bases its value | |
520 | ;; on the indentation of previous lines; if they're | |
521 | ;; indented specially, it could return a column | |
522 | ;; that's well into the current line's text. So | |
523 | ;; we'll take at most that many space, tab, or * | |
524 | ;; characters, and use that as our fill prefix. | |
525 | (let ((max-prefix-end | |
526 | (progn | |
527 | (move-to-column | |
528 | (calculate-c-indent-within-comment t) | |
529 | t) | |
530 | (point)))) | |
531 | (beginning-of-line) | |
532 | (skip-chars-forward " \t*" max-prefix-end) | |
84f4e216 RS |
533 | ;; Don't include part of comment terminator |
534 | ;; in the fill-prefix. | |
535 | (and (eq (following-char) ?/) | |
536 | (eq (preceding-char) ?*) | |
537 | (backward-char 1)) | |
0fef40c0 RS |
538 | (point))) |
539 | ||
540 | ;; If the comment is only one line followed by a blank | |
541 | ;; line, calling move-to-column above may have added | |
542 | ;; some spaces and tabs to the end of the line; the | |
543 | ;; fill-paragraph function will then delete it and the | |
544 | ;; newline following it, so we'll lose a blank line | |
545 | ;; when we shouldn't. So delete anything | |
546 | ;; move-to-column added to the end of the line. We | |
547 | ;; record the line width instead of the position of the | |
548 | ;; old line end because move-to-column might break a | |
549 | ;; tab into spaces, and the new characters introduced | |
550 | ;; there shouldn't be deleted. | |
551 | ||
552 | ;; If you can see a better way to do this, please make | |
553 | ;; the change. This seems very messy to me. | |
554 | (delete-region (progn (move-to-column line-width) | |
555 | (point)) | |
556 | (progn (end-of-line) (point)))))))) | |
557 | ||
558 | (paragraph-start | |
559 | ;; Lines containing just a comment start or just an end | |
560 | ;; should not be filled into paragraphs they are next to. | |
f95f9d2b | 561 | (concat |
0fef40c0 | 562 | paragraph-start |
52af0e47 | 563 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
0fef40c0 RS |
564 | (paragraph-separate |
565 | (concat | |
566 | paragraph-separate | |
52af0e47 | 567 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
0fef40c0 RS |
568 | (chars-to-delete 0)) |
569 | (save-restriction | |
570 | ;; Don't fill the comment together with the code following it. | |
571 | ;; So temporarily exclude everything before the comment start, | |
572 | ;; and everything after the line where the comment ends. | |
573 | ;; If comment-start-place is non-nil, the comment starter is there. | |
574 | ;; Otherwise, point is inside the comment. | |
575 | (narrow-to-region (save-excursion | |
576 | (if comment-start-place | |
577 | (goto-char comment-start-place) | |
578 | (search-backward "/*")) | |
f95f9d2b RM |
579 | ;; Protect text before the comment start |
580 | ;; by excluding it. Add spaces to bring back | |
0fef40c0 RS |
581 | ;; proper indentation of that point. |
582 | (let ((column (current-column))) | |
583 | (prog1 (point) | |
584 | (setq chars-to-delete column) | |
585 | (insert-char ?\ column)))) | |
586 | (save-excursion | |
587 | (if comment-start-place | |
588 | (goto-char (+ comment-start-place 2))) | |
589 | (search-forward "*/" nil 'move) | |
590 | (forward-line 1) | |
591 | (point))) | |
58ac467e KH |
592 | (save-excursion |
593 | (goto-char (point-max)) | |
594 | (forward-line -1) | |
595 | ;; And comment terminator was on a separate line before, | |
596 | ;; keep it that way. | |
597 | ;; This also avoids another problem: | |
598 | ;; if the fill-prefix ends in a *, it could eat up | |
599 | ;; the * of the comment terminator. | |
600 | (if (looking-at "[ \t]*\\*/") | |
601 | (narrow-to-region (point-min) (point)))) | |
0fef40c0 RS |
602 | (fill-paragraph arg) |
603 | (save-excursion | |
604 | ;; Delete the chars we inserted to avoid clobbering | |
605 | ;; the stuff before the comment start. | |
606 | (goto-char (point-min)) | |
607 | (if (> chars-to-delete 0) | |
608 | (delete-region (point) (+ (point) chars-to-delete))) | |
609 | ;; Find the comment ender (should be on last line of buffer, | |
610 | ;; given the narrowing) and don't leave it on its own line. | |
176afd04 KH |
611 | ;; Do this with a fill command, so as to preserve sentence |
612 | ;; boundaries. | |
0fef40c0 RS |
613 | (goto-char (point-max)) |
614 | (forward-line -1) | |
615 | (search-forward "*/" nil 'move) | |
616 | (beginning-of-line) | |
617 | (if (looking-at "[ \t]*\\*/") | |
176afd04 KH |
618 | (let ((fill-column (+ fill-column 9999))) |
619 | (forward-line -1) | |
620 | (fill-region-as-paragraph (point) (point-max))))))) | |
0fef40c0 | 621 | ;; Outside of comments: do ordinary filling. |
fcf9745f RS |
622 | (fill-paragraph arg))) |
623 | t)) | |
a17915dc ER |
624 | |
625 | (defun electric-c-brace (arg) | |
626 | "Insert character and correct line's indentation." | |
627 | (interactive "P") | |
628 | (let (insertpos) | |
629 | (if (and (not arg) | |
630 | (eolp) | |
631 | (or (save-excursion | |
632 | (skip-chars-backward " \t") | |
633 | (bolp)) | |
634 | (if c-auto-newline (progn (c-indent-line) (newline) t) nil))) | |
635 | (progn | |
636 | (insert last-command-char) | |
637 | (c-indent-line) | |
638 | (if c-auto-newline | |
639 | (progn | |
640 | (newline) | |
641 | ;; (newline) may have done auto-fill | |
642 | (setq insertpos (- (point) 2)) | |
643 | (c-indent-line))) | |
644 | (save-excursion | |
645 | (if insertpos (goto-char (1+ insertpos))) | |
646 | (delete-char -1)))) | |
647 | (if insertpos | |
648 | (save-excursion | |
649 | (goto-char insertpos) | |
650 | (self-insert-command (prefix-numeric-value arg))) | |
651 | (self-insert-command (prefix-numeric-value arg))))) | |
652 | ||
653 | (defun electric-c-sharp-sign (arg) | |
654 | "Insert character and correct line's indentation." | |
655 | (interactive "P") | |
656 | (if (save-excursion | |
657 | (skip-chars-backward " \t") | |
658 | (bolp)) | |
659 | (let ((c-auto-newline nil)) | |
660 | (electric-c-terminator arg)) | |
661 | (self-insert-command (prefix-numeric-value arg)))) | |
662 | ||
663 | (defun electric-c-semi (arg) | |
664 | "Insert character and correct line's indentation." | |
665 | (interactive "P") | |
666 | (if c-auto-newline | |
667 | (electric-c-terminator arg) | |
668 | (self-insert-command (prefix-numeric-value arg)))) | |
669 | ||
670 | (defun electric-c-terminator (arg) | |
671 | "Insert character and correct line's indentation." | |
672 | (interactive "P") | |
673 | (let (insertpos (end (point))) | |
674 | (if (and (not arg) (eolp) | |
675 | (not (save-excursion | |
676 | (beginning-of-line) | |
677 | (skip-chars-forward " \t") | |
678 | (or (= (following-char) ?#) | |
679 | ;; Colon is special only after a label, or case .... | |
680 | ;; So quickly rule out most other uses of colon | |
681 | ;; and do no indentation for them. | |
682 | (and (eq last-command-char ?:) | |
3a65941e | 683 | (not (looking-at c-switch-label-regexp)) |
a17915dc ER |
684 | (save-excursion |
685 | (skip-chars-forward "a-zA-Z0-9_$") | |
686 | (skip-chars-forward " \t") | |
687 | (< (point) end))) | |
688 | (progn | |
689 | (beginning-of-defun) | |
690 | (let ((pps (parse-partial-sexp (point) end))) | |
691 | (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))))) | |
692 | (progn | |
693 | (insert last-command-char) | |
694 | (c-indent-line) | |
695 | (and c-auto-newline | |
696 | (not (c-inside-parens-p)) | |
697 | (progn | |
698 | (newline) | |
699 | ;; (newline) may have done auto-fill | |
700 | (setq insertpos (- (point) 2)) | |
701 | (c-indent-line))) | |
702 | (save-excursion | |
703 | (if insertpos (goto-char (1+ insertpos))) | |
704 | (delete-char -1)))) | |
705 | (if insertpos | |
706 | (save-excursion | |
707 | (goto-char insertpos) | |
708 | (self-insert-command (prefix-numeric-value arg))) | |
709 | (self-insert-command (prefix-numeric-value arg))))) | |
710 | ||
711 | (defun c-inside-parens-p () | |
712 | (condition-case () | |
713 | (save-excursion | |
714 | (save-restriction | |
715 | (narrow-to-region (point) | |
716 | (progn (beginning-of-defun) (point))) | |
717 | (goto-char (point-max)) | |
718 | (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\())) | |
719 | (error nil))) | |
720 | \f | |
721 | (defun c-indent-command (&optional whole-exp) | |
722 | "Indent current line as C code, or in some cases insert a tab character. | |
723 | If `c-tab-always-indent' is non-nil (the default), always indent current line. | |
724 | Otherwise, indent the current line only if point is at the left margin or | |
725 | in the line's indentation; otherwise insert a tab. | |
726 | ||
727 | A numeric argument, regardless of its value, means indent rigidly all the | |
728 | lines of the expression starting after point so that this line becomes | |
729 | properly indented. The relative indentation among the lines of the | |
730 | expression are preserved." | |
731 | (interactive "P") | |
732 | (if whole-exp | |
733 | ;; If arg, always indent this line as C | |
734 | ;; and shift remaining lines of expression the same amount. | |
735 | (let ((shift-amt (c-indent-line)) | |
736 | beg end) | |
737 | (save-excursion | |
738 | (if c-tab-always-indent | |
739 | (beginning-of-line)) | |
740 | ;; Find beginning of following line. | |
741 | (save-excursion | |
742 | (forward-line 1) (setq beg (point))) | |
743 | ;; Find first beginning-of-sexp for sexp extending past this line. | |
744 | (while (< (point) beg) | |
745 | (forward-sexp 1) | |
746 | (setq end (point)) | |
747 | (skip-chars-forward " \t\n"))) | |
748 | (if (> end beg) | |
749 | (indent-code-rigidly beg end shift-amt "#"))) | |
750 | (if (and (not c-tab-always-indent) | |
751 | (save-excursion | |
752 | (skip-chars-backward " \t") | |
753 | (not (bolp)))) | |
754 | (insert-tab) | |
755 | (c-indent-line)))) | |
756 | ||
757 | (defun c-indent-line () | |
758 | "Indent current line as C code. | |
759 | Return the amount the indentation changed by." | |
760 | (let ((indent (calculate-c-indent nil)) | |
761 | beg shift-amt | |
762 | (case-fold-search nil) | |
763 | (pos (- (point-max) (point)))) | |
764 | (beginning-of-line) | |
765 | (setq beg (point)) | |
766 | (cond ((eq indent nil) | |
767 | (setq indent (current-indentation))) | |
768 | ((eq indent t) | |
769 | (setq indent (calculate-c-indent-within-comment))) | |
770 | ((looking-at "[ \t]*#") | |
771 | (setq indent 0)) | |
772 | (t | |
773 | (skip-chars-forward " \t") | |
774 | (if (listp indent) (setq indent (car indent))) | |
3a65941e | 775 | (cond ((or (looking-at c-switch-label-regexp) |
a17915dc ER |
776 | (and (looking-at "[A-Za-z]") |
777 | (save-excursion | |
778 | (forward-sexp 1) | |
779 | (looking-at ":")))) | |
780 | (setq indent (max 1 (+ indent c-label-offset)))) | |
781 | ((and (looking-at "else\\b") | |
782 | (not (looking-at "else\\s_"))) | |
783 | (setq indent (save-excursion | |
784 | (c-backward-to-start-of-if) | |
785 | (current-indentation)))) | |
401662cb RS |
786 | ((and (looking-at "}[ \t]*else\\b") |
787 | (not (looking-at "}[ \t]*else\\s_"))) | |
a17915dc ER |
788 | (setq indent (save-excursion |
789 | (forward-char) | |
790 | (backward-sexp) | |
eca5b04c | 791 | (c-backward-to-start-of-if) |
a17915dc ER |
792 | (current-indentation)))) |
793 | ((and (looking-at "while\\b") | |
401662cb | 794 | (not (looking-at "while\\s_")) |
a17915dc ER |
795 | (save-excursion |
796 | (c-backward-to-start-of-do))) | |
797 | ;; This is a `while' that ends a do-while. | |
798 | (setq indent (save-excursion | |
799 | (c-backward-to-start-of-do) | |
800 | (current-indentation)))) | |
801 | ((= (following-char) ?}) | |
802 | (setq indent (- indent c-indent-level))) | |
803 | ((= (following-char) ?{) | |
804 | (setq indent (+ indent c-brace-offset)))))) | |
805 | (skip-chars-forward " \t") | |
806 | (setq shift-amt (- indent (current-column))) | |
807 | (if (zerop shift-amt) | |
808 | (if (> (- (point-max) pos) (point)) | |
809 | (goto-char (- (point-max) pos))) | |
810 | (delete-region beg (point)) | |
811 | (indent-to indent) | |
812 | ;; If initial point was within line's indentation, | |
813 | ;; position after the indentation. Else stay at same point in text. | |
814 | (if (> (- (point-max) pos) (point)) | |
815 | (goto-char (- (point-max) pos)))) | |
816 | shift-amt)) | |
817 | ||
818 | (defun calculate-c-indent (&optional parse-start) | |
819 | "Return appropriate indentation for current line as C code. | |
820 | In usual case returns an integer: the column to indent to. | |
821 | Returns nil if line starts inside a string, t if in a comment." | |
822 | (save-excursion | |
823 | (beginning-of-line) | |
824 | (let ((indent-point (point)) | |
825 | (case-fold-search nil) | |
826 | state | |
827 | containing-sexp) | |
828 | (if parse-start | |
829 | (goto-char parse-start) | |
830 | (beginning-of-defun)) | |
831 | (while (< (point) indent-point) | |
832 | (setq parse-start (point)) | |
833 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
834 | (setq containing-sexp (car (cdr state)))) | |
835 | (cond ((or (nth 3 state) (nth 4 state)) | |
836 | ;; return nil or t if should not change this line | |
837 | (nth 4 state)) | |
838 | ((null containing-sexp) | |
839 | ;; Line is at top level. May be data or function definition, | |
840 | ;; or may be function argument declaration. | |
841 | ;; Indent like the previous top level line | |
842 | ;; unless that ends in a closeparen without semicolon, | |
843 | ;; in which case this line is the first argument decl. | |
844 | (goto-char indent-point) | |
845 | (skip-chars-forward " \t") | |
846 | (if (= (following-char) ?{) | |
847 | 0 ; Unless it starts a function body | |
848 | (c-backward-to-noncomment (or parse-start (point-min))) | |
849 | ;; Look at previous line that's at column 0 | |
850 | ;; to determine whether we are in top-level decls | |
851 | ;; or function's arg decls. Set basic-indent accordingly. | |
852 | (let ((basic-indent | |
853 | (save-excursion | |
854 | (re-search-backward "^[^ \^L\t\n#]" nil 'move) | |
c763f396 | 855 | (let (comment lim) |
6ec3899e RS |
856 | ;; Recognize the DEFUN macro in Emacs. |
857 | (if (save-excursion | |
858 | ;; Move down to the (putative) argnames line. | |
35a4d143 RS |
859 | (while (and (not (eobp)) |
860 | (not (looking-at " *[({}#/]"))) | |
6ec3899e RS |
861 | (forward-line 1)) |
862 | ;; Go back to the DEFUN, if it is one. | |
863 | (condition-case nil | |
864 | (backward-sexp 1) | |
865 | (error)) | |
866 | (beginning-of-line) | |
6ec3899e RS |
867 | (looking-at "DEFUN\\b")) |
868 | c-argdecl-indent | |
869 | (if (and (looking-at "\\sw\\|\\s_") | |
791cc57d RS |
870 | ;; This is careful to stop at the first |
871 | ;; paren if we have | |
872 | ;; int foo Proto ((int, int)); | |
873 | (looking-at "[^\"\n=(]*(") | |
6ec3899e RS |
874 | (progn |
875 | (goto-char (1- (match-end 0))) | |
caeb79ef RS |
876 | ;; Skip any number of paren-groups. |
877 | ;; Consider typedef int (*fcn) (int); | |
878 | (while (= (following-char) ?\() | |
879 | (setq lim (point)) | |
880 | (condition-case nil | |
881 | (forward-sexp 1) | |
882 | (error)) | |
883 | (skip-chars-forward " \t\f")) | |
884 | ;; Have we reached something | |
885 | ;; that shows this isn't a function | |
886 | ;; definition? | |
6ec3899e RS |
887 | (and (< (point) indent-point) |
888 | (not (memq (following-char) | |
889 | '(?\, ?\;))))) | |
890 | ;; Make sure the "function decl" we found | |
891 | ;; is not inside a comment. | |
892 | (progn | |
95d19fad RS |
893 | ;; Move back to the `(' starting arglist |
894 | (goto-char lim) | |
6ec3899e RS |
895 | (beginning-of-line) |
896 | (while (and (not comment) | |
897 | (search-forward "/*" lim t)) | |
898 | (setq comment | |
899 | (not (search-forward "*/" lim t)))) | |
900 | (not comment))) | |
901 | c-argdecl-indent 0)))))) | |
a17915dc ER |
902 | basic-indent))) |
903 | ||
904 | ;; ;; Now add a little if this is a continuation line. | |
905 | ;; (+ basic-indent (if (or (bobp) | |
906 | ;; (memq (preceding-char) '(?\) ?\; ?\})) | |
907 | ;; ;; Line with zero indentation | |
908 | ;; ;; is probably the return-type | |
909 | ;; ;; of a function definition, | |
910 | ;; ;; so following line is function name. | |
911 | ;; (= (current-indentation) 0)) | |
912 | ;; 0 c-continued-statement-offset)) | |
913 | ||
914 | ((/= (char-after containing-sexp) ?{) | |
915 | ;; line is expression, not statement: | |
916 | ;; indent to just after the surrounding open. | |
917 | (goto-char (1+ containing-sexp)) | |
918 | (current-column)) | |
919 | (t | |
920 | ;; Statement level. Is it a continuation or a new statement? | |
921 | ;; Find previous non-comment character. | |
922 | (goto-char indent-point) | |
923 | (c-backward-to-noncomment containing-sexp) | |
924 | ;; Back up over label lines, since they don't | |
925 | ;; affect whether our line is a continuation. | |
926 | (while (or (eq (preceding-char) ?\,) | |
927 | (and (eq (preceding-char) ?:) | |
928 | (or (eq (char-after (- (point) 2)) ?\') | |
929 | (memq (char-syntax (char-after (- (point) 2))) | |
930 | '(?w ?_))))) | |
931 | (if (eq (preceding-char) ?\,) | |
932 | (progn (forward-char -1) | |
933 | (c-backward-to-start-of-continued-exp containing-sexp))) | |
934 | (beginning-of-line) | |
935 | (c-backward-to-noncomment containing-sexp)) | |
936 | ;; Check for a preprocessor statement or its continuation lines. | |
5ef470be KH |
937 | ;; Move back to end of previous non-preprocessor line, |
938 | ;; or possibly beginning of buffer. | |
a17915dc ER |
939 | (let ((found (point)) stop) |
940 | (while (not stop) | |
5ef470be KH |
941 | (beginning-of-line) |
942 | (cond ((bobp) | |
943 | (setq found (point) | |
944 | stop t)) | |
945 | ((save-excursion (forward-char -1) | |
a17915dc | 946 | (= (preceding-char) ?\\)) |
5ef470be | 947 | (forward-char -1)) |
a17915dc ER |
948 | ;; This line is not preceded by a backslash. |
949 | ;; So either it starts a preprocessor command | |
950 | ;; or any following continuation lines | |
951 | ;; should not be skipped. | |
5ef470be KH |
952 | ((= (following-char) ?#) |
953 | (forward-char -1) | |
a17915dc ER |
954 | (setq found (point))) |
955 | (t (setq stop t)))) | |
956 | (goto-char found)) | |
957 | ;; Now we get the answer. | |
5ef470be | 958 | (if (and (not (memq (preceding-char) '(0 ?\, ?\; ?\} ?\{))) |
a17915dc ER |
959 | ;; But don't treat a line with a close-brace |
960 | ;; as a continuation. It is probably the | |
961 | ;; end of an enum type declaration. | |
962 | (save-excursion | |
963 | (goto-char indent-point) | |
964 | (skip-chars-forward " \t") | |
965 | (not (= (following-char) ?})))) | |
966 | ;; This line is continuation of preceding line's statement; | |
967 | ;; indent c-continued-statement-offset more than the | |
968 | ;; previous line of the statement. | |
969 | (progn | |
970 | (c-backward-to-start-of-continued-exp containing-sexp) | |
971 | (+ c-continued-statement-offset (current-column) | |
972 | (if (save-excursion (goto-char indent-point) | |
973 | (skip-chars-forward " \t") | |
974 | (eq (following-char) ?{)) | |
975 | c-continued-brace-offset 0))) | |
976 | ;; This line starts a new statement. | |
977 | ;; Position following last unclosed open. | |
978 | (goto-char containing-sexp) | |
979 | ;; Is line first statement after an open-brace? | |
980 | (or | |
981 | ;; If no, find that first statement and indent like it. | |
982 | (save-excursion | |
983 | (forward-char 1) | |
984 | (let ((colon-line-end 0)) | |
985 | (while (progn (skip-chars-forward " \t\n") | |
986 | (looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:")) | |
987 | ;; Skip over comments and labels following openbrace. | |
988 | (cond ((= (following-char) ?\#) | |
989 | (forward-line 1)) | |
990 | ((= (following-char) ?\/) | |
991 | (forward-char 2) | |
992 | (search-forward "*/" nil 'move)) | |
993 | ;; case or label: | |
994 | (t | |
995 | (save-excursion (end-of-line) | |
996 | (setq colon-line-end (point))) | |
997 | (search-forward ":")))) | |
998 | ;; The first following code counts | |
999 | ;; if it is before the line we want to indent. | |
1000 | (and (< (point) indent-point) | |
f95f9d2b | 1001 | (- |
1635fcdd RS |
1002 | (if (> colon-line-end (point)) |
1003 | (- (current-indentation) c-label-offset) | |
1004 | (current-column)) | |
1005 | ;; If prev stmt starts with open-brace, that | |
1006 | ;; open brace was offset by c-brace-offset. | |
1007 | ;; Compensate to get the column where | |
1008 | ;; an ordinary statement would start. | |
1009 | (if (= (following-char) ?\{) c-brace-offset 0))))) | |
a17915dc ER |
1010 | ;; If no previous statement, |
1011 | ;; indent it relative to line brace is on. | |
3a8a46f1 RS |
1012 | (calculate-c-indent-after-brace)))))))) |
1013 | ||
1014 | (defun calculate-c-indent-after-brace () | |
1015 | "Return the proper C indent for the first line after an open-brace. | |
1016 | This function is called with point before the brace." | |
1017 | ;; For open brace in column zero, don't let statement | |
1018 | ;; start there too. If c-indent-level is zero, | |
1019 | ;; use c-brace-offset + c-continued-statement-offset instead. | |
1020 | ;; For open-braces not the first thing in a line, | |
1021 | ;; add in c-brace-imaginary-offset. | |
1022 | (+ (if (and (bolp) (zerop c-indent-level)) | |
1023 | (+ c-brace-offset c-continued-statement-offset) | |
1024 | c-indent-level) | |
1025 | ;; Move back over whitespace before the openbrace. | |
1026 | ;; If openbrace is not first nonwhite thing on the line, | |
1027 | ;; add the c-brace-imaginary-offset. | |
1028 | (progn (skip-chars-backward " \t") | |
1029 | (if (bolp) 0 c-brace-imaginary-offset)) | |
1030 | ;; If the openbrace is preceded by a parenthesized exp, | |
1031 | ;; move to the beginning of that; | |
1032 | ;; possibly a different line | |
1033 | (progn | |
1034 | (if (eq (preceding-char) ?\)) | |
1035 | (forward-sexp -1)) | |
1036 | ;; Get initial indentation of the line we are on. | |
1037 | (current-indentation)))) | |
a17915dc ER |
1038 | |
1039 | (defun calculate-c-indent-within-comment (&optional after-star) | |
1040 | "Return the indentation amount for line inside a block comment. | |
1041 | Optional arg AFTER-STAR means, if lines in the comment have a leading star, | |
1042 | return the indentation of the text that would follow this star." | |
1043 | (let (end star-start) | |
1044 | (save-excursion | |
1045 | (beginning-of-line) | |
1046 | (skip-chars-forward " \t") | |
1047 | (setq star-start (= (following-char) ?\*)) | |
1048 | (skip-chars-backward " \t\n") | |
1049 | (setq end (point)) | |
1050 | (beginning-of-line) | |
1051 | (skip-chars-forward " \t") | |
1052 | (if after-star | |
1053 | (and (looking-at "\\*") | |
1054 | (re-search-forward "\\*[ \t]*"))) | |
1055 | (and (re-search-forward "/\\*[ \t]*" end t) | |
1056 | star-start | |
1057 | (not after-star) | |
1058 | (goto-char (1+ (match-beginning 0)))) | |
1059 | (if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*)) | |
1060 | (1+ (current-column)) | |
1061 | (current-column))))) | |
1062 | ||
1063 | ||
1064 | (defun c-backward-to-noncomment (lim) | |
1065 | (let (opoint stop) | |
1066 | (while (not stop) | |
1067 | (skip-chars-backward " \t\n\f" lim) | |
1068 | (setq opoint (point)) | |
1069 | (if (and (>= (point) (+ 2 lim)) | |
1070 | (save-excursion | |
1071 | (forward-char -2) | |
1072 | (looking-at "\\*/"))) | |
1073 | (search-backward "/*" lim 'move) | |
1074 | (setq stop (or (<= (point) lim) | |
1075 | (save-excursion | |
1076 | (beginning-of-line) | |
1077 | (skip-chars-forward " \t") | |
1078 | (not (looking-at "#"))))) | |
1079 | (or stop (beginning-of-line)))))) | |
1080 | ||
1081 | (defun c-backward-to-start-of-continued-exp (lim) | |
1082 | (if (memq (preceding-char) '(?\) ?\")) | |
1083 | (forward-sexp -1)) | |
1084 | (beginning-of-line) | |
1085 | (if (<= (point) lim) | |
1086 | (goto-char (1+ lim))) | |
1087 | (skip-chars-forward " \t")) | |
1088 | ||
1089 | (defun c-backward-to-start-of-if (&optional limit) | |
1090 | "Move to the start of the last \"unbalanced\" `if'." | |
1091 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
1092 | (let ((if-level 1) | |
1093 | (case-fold-search nil)) | |
1094 | (while (and (not (bobp)) (not (zerop if-level))) | |
1095 | (backward-sexp 1) | |
401662cb RS |
1096 | (cond ((and (looking-at "else\\b") |
1097 | (not (looking-at "else\\s_"))) | |
a17915dc | 1098 | (setq if-level (1+ if-level))) |
401662cb RS |
1099 | ((and (looking-at "if\\b") |
1100 | (not (looking-at "if\\s_"))) | |
a17915dc ER |
1101 | (setq if-level (1- if-level))) |
1102 | ((< (point) limit) | |
1103 | (setq if-level 0) | |
1104 | (goto-char limit)))))) | |
1105 | ||
1106 | (defun c-backward-to-start-of-do (&optional limit) | |
1107 | "If point follows a `do' statement, move to beginning of it and return t. | |
1108 | Otherwise return nil and don't move point." | |
1109 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
1110 | (let ((first t) | |
1111 | (startpos (point)) | |
1112 | (done nil)) | |
1113 | (while (not done) | |
1114 | (let ((next-start (point))) | |
1115 | (condition-case nil | |
1116 | ;; Move back one token or one brace or paren group. | |
1117 | (backward-sexp 1) | |
1118 | ;; If we find an open-brace, we lose. | |
1119 | (error (setq done 'fail))) | |
1120 | (if done | |
1121 | nil | |
1122 | ;; If we reached a `do', we win. | |
1123 | (if (looking-at "do\\b") | |
1124 | (setq done 'succeed) | |
1125 | ;; Otherwise, if we skipped a semicolon, we lose. | |
1126 | ;; (Exception: we can skip one semicolon before getting | |
1127 | ;; to a the last token of the statement, unless that token | |
1128 | ;; is a close brace.) | |
1129 | (if (save-excursion | |
1130 | (forward-sexp 1) | |
1131 | (or (and (not first) (= (preceding-char) ?})) | |
1132 | (search-forward ";" next-start t | |
1133 | (if (and first | |
1134 | (/= (preceding-char) ?})) | |
1135 | 2 1)))) | |
1136 | (setq done 'fail) | |
1137 | (setq first nil) | |
1138 | ;; If we go too far back in the buffer, we lose. | |
1139 | (if (< (point) limit) | |
1140 | (setq done 'fail))))))) | |
1141 | (if (eq done 'succeed) | |
1142 | t | |
1143 | (goto-char startpos) | |
1144 | nil))) | |
1145 | \f | |
1146 | (defun c-beginning-of-statement (count) | |
1147 | "Go to the beginning of the innermost C statement. | |
1148 | With prefix arg, go back N - 1 statements. If already at the beginning of a | |
eb8c3be9 | 1149 | statement then go to the beginning of the preceding one. |
17f0e88a RS |
1150 | If within a string or comment, or next to a comment (only whitespace between), |
1151 | move by sentences instead of statements." | |
a17915dc | 1152 | (interactive "p") |
d4fbc2d5 RS |
1153 | (let ((here (point)) state) |
1154 | (save-excursion | |
1155 | (beginning-of-defun) | |
1156 | (setq state (parse-partial-sexp (point) here nil nil))) | |
17f0e88a RS |
1157 | (if (or (nth 3 state) (nth 4 state) |
1158 | (looking-at (concat "[ \t]*" comment-start-skip)) | |
1159 | (save-excursion (skip-chars-backward " \t") | |
1160 | (goto-char (- (point) 2)) | |
1161 | (looking-at "\\*/"))) | |
d4fbc2d5 RS |
1162 | (forward-sentence (- count)) |
1163 | (while (> count 0) | |
1164 | (c-beginning-of-statement-1) | |
1165 | (setq count (1- count))) | |
1166 | (while (< count 0) | |
1167 | (c-end-of-statement-1) | |
1168 | (setq count (1+ count)))))) | |
a17915dc ER |
1169 | |
1170 | (defun c-end-of-statement (count) | |
1171 | "Go to the end of the innermost C statement. | |
d4fbc2d5 RS |
1172 | With prefix arg, go forward N - 1 statements. |
1173 | Move forward to end of the next statement if already at end. | |
1174 | If within a string or comment, move by sentences instead of statements." | |
a17915dc ER |
1175 | (interactive "p") |
1176 | (c-beginning-of-statement (- count))) | |
1177 | ||
1178 | (defun c-beginning-of-statement-1 () | |
1179 | (let ((last-begin (point)) | |
1180 | (first t)) | |
1181 | (condition-case () | |
1182 | (progn | |
1183 | (while (and (not (bobp)) | |
1184 | (progn | |
1185 | (backward-sexp 1) | |
1186 | (or first | |
1187 | (not (re-search-forward "[;{}]" last-begin t))))) | |
1188 | (setq last-begin (point) first nil)) | |
1189 | (goto-char last-begin)) | |
1190 | (error (if first (backward-up-list 1) (goto-char last-begin)))))) | |
1191 | ||
1192 | (defun c-end-of-statement-1 () | |
1193 | (condition-case () | |
1194 | (progn | |
1195 | (while (and (not (eobp)) | |
1196 | (let ((beg (point))) | |
1197 | (forward-sexp 1) | |
1198 | (let ((end (point))) | |
1199 | (save-excursion | |
1200 | (goto-char beg) | |
1201 | (not (re-search-forward "[;{}]" end t))))))) | |
1202 | (re-search-backward "[;}]") | |
1203 | (forward-char 1)) | |
f95f9d2b | 1204 | (error |
a17915dc ER |
1205 | (let ((beg (point))) |
1206 | (backward-up-list -1) | |
1207 | (let ((end (point))) | |
1208 | (goto-char beg) | |
1209 | (search-forward ";" end 'move)))))) | |
1210 | \f | |
1211 | (defun mark-c-function () | |
1212 | "Put mark at end of C function, point at beginning." | |
1213 | (interactive) | |
1214 | (push-mark (point)) | |
1215 | (end-of-defun) | |
069b6ce3 | 1216 | (push-mark (point) nil t) |
a17915dc ER |
1217 | (beginning-of-defun) |
1218 | (backward-paragraph)) | |
1219 | \f | |
eccf8697 RS |
1220 | ;; Idea of ENDPOS is, indent each line, stopping when |
1221 | ;; ENDPOS is encountered. But it's too much of a pain to make that work. | |
a17915dc | 1222 | (defun indent-c-exp (&optional endpos) |
eccf8697 | 1223 | "Indent each line of the C grouping following point." |
a17915dc ER |
1224 | (interactive) |
1225 | (let* ((indent-stack (list nil)) | |
1226 | (opoint (point)) ;; May be altered below. | |
1227 | (contain-stack | |
1228 | (list (if endpos | |
1229 | (let (funbeg) | |
1230 | ;; Find previous fcn-start. | |
1231 | (save-excursion (forward-char 1) | |
1232 | (beginning-of-defun) | |
1233 | (setq funbeg (point))) | |
9ce49c8d | 1234 | (setq opoint funbeg) |
a17915dc ER |
1235 | ;; Try to find containing open, |
1236 | ;; but don't scan past that fcn-start. | |
1237 | (save-restriction | |
1238 | (narrow-to-region funbeg (point)) | |
1239 | (condition-case nil | |
1240 | (save-excursion | |
9ce49c8d RS |
1241 | (backward-up-list 1) |
1242 | (point)) | |
a17915dc ER |
1243 | ;; We gave up: must be between fcns. |
1244 | ;; Set opoint to beg of prev fcn | |
1245 | ;; since otherwise calculate-c-indent | |
1246 | ;; will get wrong answers. | |
1247 | (error (setq opoint funbeg) | |
1248 | (point))))) | |
1249 | (point)))) | |
1250 | (case-fold-search nil) | |
1251 | restart outer-loop-done inner-loop-done state ostate | |
1252 | this-indent last-sexp | |
1253 | at-else at-brace at-while | |
3bbf6363 | 1254 | last-depth this-point |
a17915dc ER |
1255 | (next-depth 0)) |
1256 | ;; If the braces don't match, get an error right away. | |
1257 | (save-excursion | |
1258 | (forward-sexp 1)) | |
1259 | ;; Realign the comment on the first line, even though we don't reindent it. | |
1260 | (save-excursion | |
1261 | (let ((beg (point))) | |
1262 | (and (re-search-forward | |
1263 | comment-start-skip | |
1264 | (save-excursion (end-of-line) (point)) t) | |
9ce49c8d RS |
1265 | ;; Make sure this isn't a comment alone on a line |
1266 | ;; (which should be indented like code instead). | |
1267 | (save-excursion | |
1268 | (goto-char (match-beginning 0)) | |
1269 | (skip-chars-backward " \t") | |
1270 | (not (bolp))) | |
a17915dc ER |
1271 | ;; Make sure the comment starter we found |
1272 | ;; is not actually in a string or quoted. | |
1273 | (let ((new-state | |
1274 | (parse-partial-sexp beg (point) | |
1275 | nil nil state))) | |
1276 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
1277 | (progn (indent-for-comment) (beginning-of-line))))) | |
1278 | (save-excursion | |
1279 | (setq outer-loop-done nil) | |
1280 | (while (and (not (eobp)) | |
1281 | (if endpos (< (point) endpos) | |
1282 | (not outer-loop-done))) | |
1283 | (setq last-depth next-depth) | |
1284 | ;; Compute how depth changes over this line | |
1285 | ;; plus enough other lines to get to one that | |
1286 | ;; does not end inside a comment or string. | |
1287 | ;; Meanwhile, do appropriate indentation on comment lines. | |
1288 | (setq inner-loop-done nil) | |
1289 | (while (and (not inner-loop-done) | |
1290 | (not (and (eobp) (setq outer-loop-done t)))) | |
1291 | (setq ostate state) | |
1292 | (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) | |
1293 | nil nil state)) | |
1294 | (setq next-depth (car state)) | |
1295 | (if (and (car (cdr (cdr state))) | |
1296 | (>= (car (cdr (cdr state))) 0)) | |
1297 | (setq last-sexp (car (cdr (cdr state))))) | |
3bbf6363 RS |
1298 | ;; If this line started within a comment, indent it as such. |
1299 | (if (or (nth 4 ostate) (nth 7 ostate)) | |
a17915dc | 1300 | (c-indent-line)) |
3bbf6363 RS |
1301 | ;; If it ends outside of comments or strings, exit the inner loop. |
1302 | ;; Otherwise move on to next line. | |
1303 | (if (or (nth 3 state) (nth 4 state) (nth 7 state)) | |
a17915dc ER |
1304 | (forward-line 1) |
1305 | (setq inner-loop-done t))) | |
1306 | (and endpos | |
1307 | (while (< next-depth 0) | |
1308 | (setq indent-stack (append indent-stack (list nil))) | |
1309 | (setq contain-stack (append contain-stack (list nil))) | |
1310 | (setq next-depth (1+ next-depth)) | |
1311 | (setq last-depth (1+ last-depth)) | |
1312 | (setcar (nthcdr 6 state) (1+ (nth 6 state))))) | |
1313 | (setq outer-loop-done (and (not endpos) (<= next-depth 0))) | |
1314 | (if outer-loop-done | |
1315 | nil | |
1316 | ;; If this line had ..))) (((.. in it, pop out of the levels | |
1317 | ;; that ended anywhere in this line, even if the final depth | |
1318 | ;; doesn't indicate that they ended. | |
1319 | (while (> last-depth (nth 6 state)) | |
1320 | (setq indent-stack (cdr indent-stack) | |
1321 | contain-stack (cdr contain-stack) | |
1322 | last-depth (1- last-depth))) | |
1323 | (if (/= last-depth next-depth) | |
1324 | (setq last-sexp nil)) | |
1325 | ;; Add levels for any parens that were started in this line. | |
1326 | (while (< last-depth next-depth) | |
1327 | (setq indent-stack (cons nil indent-stack) | |
1328 | contain-stack (cons nil contain-stack) | |
1329 | last-depth (1+ last-depth))) | |
1330 | (if (null (car contain-stack)) | |
1331 | (setcar contain-stack (or (car (cdr state)) | |
1332 | (save-excursion (forward-sexp -1) | |
1333 | (point))))) | |
1334 | (forward-line 1) | |
1335 | (skip-chars-forward " \t") | |
9ce49c8d RS |
1336 | ;; Don't really reindent if the line is just whitespace, |
1337 | ;; or if it is past the endpos. | |
1338 | ;; (The exit test in the outer while | |
1339 | ;; does not exit until we have passed the first line | |
1340 | ;; past the region.) | |
1341 | (if (or (eolp) (and endpos (>= (point) endpos))) | |
a17915dc | 1342 | nil |
73dae9a9 RS |
1343 | ;; Is this line in a new nesting level? |
1344 | ;; In other words, is this the first line that | |
1345 | ;; starts in the new level? | |
a17915dc ER |
1346 | (if (and (car indent-stack) |
1347 | (>= (car indent-stack) 0)) | |
73dae9a9 RS |
1348 | nil |
1349 | ;; Yes. | |
a17915dc | 1350 | ;; Compute the standard indent for this level. |
73dae9a9 RS |
1351 | (let (val) |
1352 | (if (= (char-after (car contain-stack)) ?{) | |
1353 | (save-excursion | |
1354 | (goto-char (car contain-stack)) | |
3a8a46f1 | 1355 | (setq val (calculate-c-indent-after-brace))) |
73dae9a9 RS |
1356 | (setq val (calculate-c-indent |
1357 | (if (car indent-stack) | |
1358 | (- (car indent-stack)) | |
1359 | opoint)))) | |
3746159f RS |
1360 | ;; t means we are in a block comment and should |
1361 | ;; calculate accordingly. | |
1362 | (if (eq val t) | |
1363 | (setq val (calculate-c-indent-within-comment))) | |
73dae9a9 RS |
1364 | (setcar indent-stack val))) |
1365 | ;; Adjust indent of this individual line | |
1366 | ;; based on its predecessor. | |
1367 | ;; Handle continuation lines, if, else, while, and so on. | |
1368 | (if (/= (char-after (car contain-stack)) ?{) | |
1369 | (setq this-indent (car indent-stack)) | |
1370 | ;; Line is at statement level. | |
1371 | ;; Is it a new statement? Is it an else? | |
1372 | ;; Find last non-comment character before this line | |
1373 | (save-excursion | |
1374 | (setq this-point (point)) | |
1375 | (setq at-else (and (looking-at "else\\b") | |
1376 | (not (looking-at "else\\s_")))) | |
1377 | (setq at-brace (= (following-char) ?{)) | |
1378 | (setq at-while (and (looking-at "while\\b") | |
1379 | (not (looking-at "while\\s_")))) | |
1380 | (if (= (following-char) ?}) | |
1381 | (setq this-indent (car indent-stack)) | |
1382 | (c-backward-to-noncomment opoint) | |
1383 | (if (not (memq (preceding-char) '(0 ?\, ?\; ?} ?: ?{))) | |
1384 | ;; Preceding line did not end in comma or semi; | |
1385 | ;; indent this line c-continued-statement-offset | |
1386 | ;; more than previous. | |
1387 | (progn | |
1388 | (c-backward-to-start-of-continued-exp (car contain-stack)) | |
1389 | (setq this-indent | |
1390 | (+ c-continued-statement-offset (current-column) | |
1391 | (if at-brace c-continued-brace-offset 0)))) | |
1392 | ;; Preceding line ended in comma or semi; | |
1393 | ;; use the standard indent for this level. | |
1394 | (cond (at-else (progn (c-backward-to-start-of-if opoint) | |
1395 | (setq this-indent | |
1396 | (current-indentation)))) | |
1397 | ((and at-while (c-backward-to-start-of-do opoint)) | |
1398 | (setq this-indent (current-indentation))) | |
1399 | ((eq (preceding-char) ?\,) | |
1400 | (goto-char this-point) | |
1401 | (setq this-indent (calculate-c-indent))) | |
1402 | (t (setq this-indent (car indent-stack)))))))) | |
a17915dc | 1403 | ;; Adjust line indentation according to its contents |
3a65941e | 1404 | (if (or (looking-at c-switch-label-regexp) |
a17915dc ER |
1405 | (and (looking-at "[A-Za-z]") |
1406 | (save-excursion | |
1407 | (forward-sexp 1) | |
1408 | (looking-at ":")))) | |
1409 | (setq this-indent (max 1 (+ this-indent c-label-offset)))) | |
1410 | (if (= (following-char) ?}) | |
1411 | (setq this-indent (- this-indent c-indent-level))) | |
1412 | (if (= (following-char) ?{) | |
e6033883 RS |
1413 | ;; Don't move an open-brace in column 0. |
1414 | ;; This is good when constructs such as | |
1415 | ;; `extern "C" {' surround a function definition | |
1416 | ;; that should be indented as usual. | |
1417 | ;; It is also good for nested functions. | |
1418 | ;; It is bad when an open-brace is indented at column 0 | |
1419 | ;; and you want to fix that, but we can't win 'em all. | |
b70af8d7 RS |
1420 | (if (zerop (current-column)) |
1421 | (setq this-indent 0) | |
1422 | (setq this-indent (+ this-indent c-brace-offset)))) | |
a17915dc ER |
1423 | ;; Don't leave indentation in empty lines. |
1424 | (if (eolp) (setq this-indent 0)) | |
1425 | ;; Put chosen indentation into effect. | |
1426 | (or (= (current-column) this-indent) | |
1427 | (= (following-char) ?\#) | |
1428 | (progn | |
1429 | (delete-region (point) (progn (beginning-of-line) (point))) | |
1430 | (indent-to this-indent))) | |
1431 | ;; Indent any comment following the text. | |
1432 | (or (looking-at comment-start-skip) | |
62057cef RS |
1433 | (save-excursion |
1434 | (let ((beg (point))) | |
1435 | (and (re-search-forward | |
1436 | comment-start-skip | |
1437 | (save-excursion (end-of-line) (point)) t) | |
1438 | ;; Make sure the comment starter we found | |
1439 | ;; is not actually in a string or quoted. | |
1440 | (let ((new-state | |
1441 | (parse-partial-sexp beg (point) | |
1442 | nil nil state))) | |
1443 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
1444 | (indent-for-comment))))))))))) | |
a17915dc ER |
1445 | |
1446 | ;; Look at all comment-start strings in the current line after point. | |
1447 | ;; Return t if one of them starts a real comment. | |
1448 | ;; This is not used yet, because indent-for-comment | |
1449 | ;; isn't smart enough to handle the cases this can find. | |
1450 | (defun indent-c-find-real-comment () | |
1451 | (let (win) | |
1452 | (while (and (not win) | |
1453 | (re-search-forward comment-start-skip | |
1454 | (save-excursion (end-of-line) (point)) | |
1455 | t)) | |
1456 | ;; Make sure the comment start is not quoted. | |
1457 | (let ((state-1 | |
1458 | (parse-partial-sexp | |
1459 | (save-excursion (beginning-of-line) (point)) | |
1460 | (point) nil nil state))) | |
1461 | (setq win (and (null (nth 3 state-1)) (null (nth 5 state-1)))))) | |
1462 | win)) | |
1463 | ||
1464 | ;; Indent every line whose first char is between START and END inclusive. | |
1465 | (defun c-indent-region (start end) | |
1466 | (save-excursion | |
1467 | (goto-char start) | |
988e2aa6 RS |
1468 | ;; Advance to first nonblank line. |
1469 | (skip-chars-forward " \t\n") | |
1470 | (beginning-of-line) | |
eccf8697 RS |
1471 | (let ((endmark (copy-marker end)) |
1472 | (c-tab-always-indent t)) | |
d52fd67c | 1473 | (while (and (bolp) (not (eobp)) (< (point) endmark)) |
eccf8697 RS |
1474 | ;; Indent one line as with TAB. |
1475 | (let ((shift-amt (c-indent-line)) | |
4fd99ee4 | 1476 | nextline sexpbeg sexpend) |
d52fd67c RS |
1477 | (if (save-excursion (beginning-of-line) (looking-at "[ \t]*#")) |
1478 | (forward-line 1) | |
eccf8697 | 1479 | (save-excursion |
d52fd67c RS |
1480 | ;; Find beginning of following line. |
1481 | (save-excursion | |
1482 | (forward-line 1) (setq nextline (point))) | |
1483 | ;; Find first beginning-of-sexp for sexp extending past this line. | |
1484 | (beginning-of-line) | |
1485 | (while (< (point) nextline) | |
1486 | (condition-case nil | |
1487 | (progn | |
1488 | (forward-sexp 1) | |
1489 | (setq sexpend (point-marker))) | |
1490 | (error (setq sexpend nil) | |
1491 | (goto-char nextline))) | |
1492 | (skip-chars-forward " \t\n")) | |
1493 | (if sexpend | |
eccf8697 | 1494 | (progn |
d52fd67c RS |
1495 | ;; Make sure the sexp we found really starts on the |
1496 | ;; current line and extends past it. | |
1497 | (goto-char sexpend) | |
1498 | (backward-sexp 1) | |
1499 | (setq sexpbeg (point))))) | |
1500 | ;; If that sexp ends within the region, | |
1501 | ;; indent it all at once, fast. | |
1502 | (if (and sexpend (> sexpend nextline) (<= sexpend endmark) | |
1503 | (< sexpbeg nextline)) | |
0b171628 | 1504 | (progn |
d52fd67c RS |
1505 | (indent-c-exp) |
1506 | (goto-char sexpend))) | |
1507 | ;; Move to following line and try again. | |
1508 | (and sexpend (set-marker sexpend nil)) | |
1509 | (forward-line 1)))) | |
a17915dc ER |
1510 | (set-marker endmark nil)))) |
1511 | \f | |
1832dbd1 | 1512 | (defun set-c-style (style &optional global) |
a17915dc | 1513 | "Set C-mode variables to use one of several different indentation styles. |
1832dbd1 RS |
1514 | The arguments are a string representing the desired style |
1515 | and a flag which, if non-nil, means to set the style globally. | |
1516 | \(Interactively, the flag comes from the prefix argument.) | |
e6dfdce5 | 1517 | Available styles are GNU, K&R, BSD and Whitesmith." |
389817fd KH |
1518 | (interactive (list (let ((completion-ignore-case t)) |
1519 | (completing-read "Use which C indentation style? " | |
1520 | c-style-alist nil t)) | |
1832dbd1 | 1521 | current-prefix-arg)) |
a17915dc | 1522 | (let ((vars (cdr (assoc style c-style-alist)))) |
1832dbd1 RS |
1523 | (or vars |
1524 | (error "Invalid C indentation style `%s'" style)) | |
a17915dc | 1525 | (while vars |
1832dbd1 RS |
1526 | (or global |
1527 | (make-local-variable (car (car vars)))) | |
a17915dc ER |
1528 | (set (car (car vars)) (cdr (car vars))) |
1529 | (setq vars (cdr vars))))) | |
1832dbd1 RS |
1530 | \f |
1531 | ;;; This page handles insertion and removal of backslashes for C macros. | |
1532 | ||
e4df16d0 SE |
1533 | (defcustom c-backslash-column 48 |
1534 | "*Minimum column for end-of-line backslashes of macro definitions." | |
1535 | :type 'integer | |
1536 | :group 'old-c) | |
1832dbd1 RS |
1537 | |
1538 | (defun c-backslash-region (from to delete-flag) | |
1539 | "Insert, align, or delete end-of-line backslashes on the lines in the region. | |
1540 | With no argument, inserts backslashes and aligns existing backslashes. | |
1541 | With an argument, deletes the backslashes. | |
1542 | ||
f95f9d2b | 1543 | This function does not modify the last line of the region if the region ends |
1832dbd1 RS |
1544 | right at the start of the following line; it does not modify blank lines |
1545 | at the start of the region. So you can put the region around an entire macro | |
1546 | definition and conveniently use this command." | |
1547 | (interactive "r\nP") | |
1548 | (save-excursion | |
1549 | (goto-char from) | |
1550 | (let ((column c-backslash-column) | |
1551 | (endmark (make-marker))) | |
1552 | (move-marker endmark to) | |
1553 | ;; Compute the smallest column number past the ends of all the lines. | |
1554 | (if (not delete-flag) | |
1555 | (while (< (point) to) | |
1556 | (end-of-line) | |
1557 | (if (= (preceding-char) ?\\) | |
1558 | (progn (forward-char -1) | |
1559 | (skip-chars-backward " \t"))) | |
1560 | (setq column (max column (1+ (current-column)))) | |
1561 | (forward-line 1))) | |
1562 | ;; Adjust upward to a tab column, if that doesn't push past the margin. | |
1563 | (if (> (% column tab-width) 0) | |
1564 | (let ((adjusted (* (/ (+ column tab-width -1) tab-width) tab-width))) | |
1565 | (if (< adjusted (window-width)) | |
1566 | (setq column adjusted)))) | |
1567 | ;; Don't modify blank lines at start of region. | |
1568 | (goto-char from) | |
1569 | (while (and (< (point) endmark) (eolp)) | |
1570 | (forward-line 1)) | |
1571 | ;; Add or remove backslashes on all the lines. | |
1572 | (while (and (< (point) endmark) | |
1573 | ;; Don't backslashify the last line | |
1574 | ;; if the region ends right at the start of the next line. | |
1575 | (save-excursion | |
1576 | (forward-line 1) | |
1577 | (< (point) endmark))) | |
1578 | (if (not delete-flag) | |
1579 | (c-append-backslash column) | |
1580 | (c-delete-backslash)) | |
1581 | (forward-line 1)) | |
1582 | (move-marker endmark nil)))) | |
1583 | ||
1584 | (defun c-append-backslash (column) | |
1585 | (end-of-line) | |
1586 | ;; Note that "\\\\" is needed to get one backslash. | |
1587 | (if (= (preceding-char) ?\\) | |
1588 | (progn (forward-char -1) | |
1589 | (delete-horizontal-space) | |
1590 | (indent-to column)) | |
1591 | (indent-to column) | |
1592 | (insert "\\"))) | |
1593 | ||
1594 | (defun c-delete-backslash () | |
1595 | (end-of-line) | |
7620dcc5 RS |
1596 | (or (bolp) |
1597 | (progn | |
1598 | (forward-char -1) | |
1599 | (if (looking-at "\\\\") | |
1600 | (delete-region (1+ (point)) | |
1601 | (progn (skip-chars-backward " \t") (point))))))) | |
1586b965 RS |
1602 | \f |
1603 | (defun c-up-conditional (count) | |
1604 | "Move back to the containing preprocessor conditional, leaving mark behind. | |
1605 | A prefix argument acts as a repeat count. With a negative argument, | |
1606 | move forward to the end of the containing preprocessor conditional. | |
1607 | When going backwards, `#elif' is treated like `#else' followed by `#if'. | |
1608 | When going forwards, `#elif' is ignored." | |
1609 | (interactive "p") | |
3c8aaef2 RS |
1610 | (c-forward-conditional (- count) t)) |
1611 | ||
1612 | (defun c-backward-conditional (count &optional up-flag) | |
1613 | "Move back across a preprocessor conditional, leaving mark behind. | |
1614 | A prefix argument acts as a repeat count. With a negative argument, | |
1615 | move forward across a preprocessor conditional." | |
1616 | (interactive "p") | |
1617 | (c-forward-conditional (- count) up-flag)) | |
1618 | ||
1619 | (defun c-forward-conditional (count &optional up-flag) | |
1620 | "Move forward across a preprocessor conditional, leaving mark behind. | |
1621 | A prefix argument acts as a repeat count. With a negative argument, | |
1622 | move backward across a preprocessor conditional." | |
1623 | (interactive "p") | |
1624 | (let* ((forward (> count 0)) | |
1586b965 RS |
1625 | (increment (if forward -1 1)) |
1626 | (search-function (if forward 're-search-forward 're-search-backward)) | |
1627 | (opoint (point)) | |
1628 | (new)) | |
1629 | (save-excursion | |
1630 | (while (/= count 0) | |
3c8aaef2 | 1631 | (let ((depth (if up-flag 0 -1)) found) |
1586b965 RS |
1632 | (save-excursion |
1633 | ;; Find the "next" significant line in the proper direction. | |
1634 | (while (and (not found) | |
1635 | ;; Rather than searching for a # sign that comes | |
1636 | ;; at the beginning of a line aside from whitespace, | |
1637 | ;; search first for a string starting with # sign. | |
1638 | ;; Then verify what precedes it. | |
1639 | ;; This is faster on account of the fastmap feature of | |
1640 | ;; the regexp matcher. | |
1641 | (funcall search-function | |
1642 | "#[ \t]*\\(if\\|elif\\|endif\\)" | |
1e2d7cce | 1643 | nil t)) |
1586b965 | 1644 | (beginning-of-line) |
1e2d7cce RS |
1645 | ;; Now verify it is really a preproc line. |
1646 | (if (looking-at "^[ \t]*#[ \t]*\\(if\\|elif\\|endif\\)") | |
3c8aaef2 | 1647 | (let ((prev depth)) |
1e2d7cce RS |
1648 | ;; Update depth according to what we found. |
1649 | (beginning-of-line) | |
1650 | (cond ((looking-at "[ \t]*#[ \t]*endif") | |
1651 | (setq depth (+ depth increment))) | |
1652 | ((looking-at "[ \t]*#[ \t]*elif") | |
1653 | (if (and forward (= depth 0)) | |
1654 | (setq found (point)))) | |
1655 | (t (setq depth (- depth increment)))) | |
3c8aaef2 RS |
1656 | ;; If we are trying to move across, and we find |
1657 | ;; an end before we find a beginning, get an error. | |
1658 | (if (and (< prev 0) (< depth prev)) | |
1659 | (error (if forward | |
1660 | "No following conditional at this level" | |
1661 | "No previous conditional at this level"))) | |
1662 | ;; When searching forward, start from next line | |
1663 | ;; so that we don't find the same line again. | |
1664 | (if forward (forward-line 1)) | |
1e2d7cce RS |
1665 | ;; If this line exits a level of conditional, exit inner loop. |
1666 | (if (< depth 0) | |
29869734 RS |
1667 | (setq found (point)))) |
1668 | ;; If the line is not really a conditional, skip past it. | |
1669 | (if forward (end-of-line))))) | |
1586b965 RS |
1670 | (or found |
1671 | (error "No containing preprocessor conditional")) | |
1672 | (goto-char (setq new found))) | |
3c8aaef2 | 1673 | (setq count (+ count increment)))) |
1586b965 RS |
1674 | (push-mark) |
1675 | (goto-char new))) | |
f95f9d2b RM |
1676 | \f |
1677 | (provide 'c-mode) | |
c0274f38 ER |
1678 | |
1679 | ;;; c-mode.el ends here |