HCoop / bpt / emacs.git / blame
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|---|---|---|
| c0274f38 ER |
1 | ;;; c-mode.el --- C code editing commands for Emacs |
| 2 | ||
| e5167999 ER |
3 | ;; Maintainer: FSF |
| 4 | ;; Last-Modified: 11 Jul 1992 | |
| 5 | ;; Keywords: c | |
| 6 | ||
| a17915dc ER |
7 | ;; Copyright (C) 1985, 1986, 1987 Free Software Foundation, Inc. |
| 8 | ||
| 9 | ;; This file is part of GNU Emacs. | |
| 10 | ||
| 11 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
| 12 | ;; it under the terms of the GNU General Public License as published by | |
| e5167999 | 13 | ;; the Free Software Foundation; either version 2, or (at your option) |
| a17915dc ER |
14 | ;; any later version. |
| 15 | ||
| 16 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
| 17 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 18 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 19 | ;; GNU General Public License for more details. | |
| 20 | ||
| 21 | ;; You should have received a copy of the GNU General Public License | |
| 22 | ;; along with GNU Emacs; see the file COPYING. If not, write to | |
| 23 | ;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. | |
| 24 | ||
| e5167999 | 25 | ;;; Code: |
| a17915dc ER |
26 | |
| 27 | (defvar c-mode-abbrev-table nil | |
| 28 | "Abbrev table in use in C mode.") | |
| 29 | (define-abbrev-table 'c-mode-abbrev-table ()) | |
| 30 | ||
| 31 | (defvar c-mode-map () | |
| 32 | "Keymap used in C mode.") | |
| 33 | (if c-mode-map | |
| 34 | () | |
| 35 | (setq c-mode-map (make-sparse-keymap)) | |
| 36 | (define-key c-mode-map "{" 'electric-c-brace) | |
| 37 | (define-key c-mode-map "}" 'electric-c-brace) | |
| 38 | (define-key c-mode-map ";" 'electric-c-semi) | |
| 39 | (define-key c-mode-map "#" 'electric-c-sharp-sign) | |
| 40 | (define-key c-mode-map ":" 'electric-c-terminator) | |
| 41 | (define-key c-mode-map "\e\C-h" 'mark-c-function) | |
| 42 | (define-key c-mode-map "\e\C-q" 'indent-c-exp) | |
| 43 | (define-key c-mode-map "\ea" 'c-beginning-of-statement) | |
| 44 | (define-key c-mode-map "\ee" 'c-end-of-statement) | |
| 45 | (define-key c-mode-map "\eq" 'c-fill-paragraph) | |
| 46 | (define-key c-mode-map "\177" 'backward-delete-char-untabify) | |
| 47 | (define-key c-mode-map "\t" 'c-indent-command)) | |
| 48 | ||
| 49 | ;; cmacexp is lame because it uses no preprocessor symbols. | |
| 50 | ;; It isn't very extensible either -- hardcodes /lib/cpp. | |
| 51 | (autoload 'c-macro-expand "cmacexp" | |
| 52 | "Display the result of expanding all C macros occurring in the region. | |
| 53 | The expansion is entirely correct because it uses the C preprocessor." | |
| 54 | t) | |
| 55 | ||
| 56 | (defvar c-mode-syntax-table nil | |
| 57 | "Syntax table in use in C-mode buffers.") | |
| 58 | ||
| 59 | (if c-mode-syntax-table | |
| 60 | () | |
| 61 | (setq c-mode-syntax-table (make-syntax-table)) | |
| 62 | (modify-syntax-entry ?\\ "\\" c-mode-syntax-table) | |
| 63 | (modify-syntax-entry ?/ ". 14" c-mode-syntax-table) | |
| 64 | (modify-syntax-entry ?* ". 23" c-mode-syntax-table) | |
| 65 | (modify-syntax-entry ?+ "." c-mode-syntax-table) | |
| 66 | (modify-syntax-entry ?- "." c-mode-syntax-table) | |
| 67 | (modify-syntax-entry ?= "." c-mode-syntax-table) | |
| 68 | (modify-syntax-entry ?% "." c-mode-syntax-table) | |
| 69 | (modify-syntax-entry ?< "." c-mode-syntax-table) | |
| 70 | (modify-syntax-entry ?> "." c-mode-syntax-table) | |
| 71 | (modify-syntax-entry ?& "." c-mode-syntax-table) | |
| 72 | (modify-syntax-entry ?| "." c-mode-syntax-table) | |
| 73 | (modify-syntax-entry ?\' "\"" c-mode-syntax-table)) | |
| 74 | ||
| 75 | (defconst c-indent-level 2 | |
| 76 | "*Indentation of C statements with respect to containing block.") | |
| 77 | (defconst c-brace-imaginary-offset 0 | |
| 78 | "*Imagined indentation of a C open brace that actually follows a statement.") | |
| 79 | (defconst c-brace-offset 0 | |
| 80 | "*Extra indentation for braces, compared with other text in same context.") | |
| 81 | (defconst c-argdecl-indent 5 | |
| 82 | "*Indentation level of declarations of C function arguments.") | |
| 83 | (defconst c-label-offset -2 | |
| 84 | "*Offset of C label lines and case statements relative to usual indentation.") | |
| 85 | (defconst c-continued-statement-offset 2 | |
| 86 | "*Extra indent for lines not starting new statements.") | |
| 87 | (defconst c-continued-brace-offset 0 | |
| 88 | "*Extra indent for substatements that start with open-braces. | |
| 89 | This is in addition to c-continued-statement-offset.") | |
| 90 | (defconst c-style-alist | |
| 91 | '(("GNU" | |
| 92 | (c-indent-level . 2) | |
| 93 | (c-argdecl-indent . 5) | |
| 94 | (c-brace-offset . 0) | |
| 95 | (c-label-offset . -2) | |
| 96 | (c-continued-statement-offset . 2)) | |
| 97 | ("K&R" | |
| 98 | (c-indent-level . 5) | |
| 99 | (c-argdecl-indent . 0) | |
| 100 | (c-brace-offset . -5) | |
| 101 | (c-label-offset . -5) | |
| 102 | (c-continued-statement-offset . 5)) | |
| 103 | ("BSD" | |
| 104 | (c-indent-level . 4) | |
| 105 | (c-argdecl-indent . 4) | |
| 106 | (c-brace-offset . -4) | |
| 107 | (c-label-offset . -4) | |
| 108 | (c-continued-statement-offset . 4)) | |
| 2b529dd2 JB |
109 | (C++ |
| 110 | (c-indent-level . 4) | |
| 111 | (c-continued-statement-offset . 4) | |
| 112 | (c-brace-offset . -4) | |
| 113 | (c-argdecl-indent . 0) | |
| 114 | (c-label-offset . -4) | |
| 115 | (c-auto-newline . t)) | |
| a17915dc ER |
116 | ("Whitesmith" |
| 117 | (c-indent-level . 4) | |
| 118 | (c-argdecl-indent . 4) | |
| 119 | (c-brace-offset . 0) | |
| 120 | (c-label-offset . -4) | |
| 121 | (c-continued-statement-offset . 4)))) | |
| 122 | ||
| 123 | (defconst c-auto-newline nil | |
| 124 | "*Non-nil means automatically newline before and after braces, | |
| 125 | and after colons and semicolons, inserted in C code. | |
| 126 | If you do not want a leading newline before braces then use: | |
| 127 | (define-key c-mode-map "{" 'electric-c-semi)") | |
| 128 | ||
| 129 | (defconst c-tab-always-indent t | |
| 130 | "*Non-nil means TAB in C mode should always reindent the current line, | |
| 131 | regardless of where in the line point is when the TAB command is used.") | |
| 132 | \f | |
| a17915dc ER |
133 | (defun c-mode () |
| 134 | "Major mode for editing C code. | |
| 135 | Expression and list commands understand all C brackets. | |
| 136 | Tab indents for C code. | |
| 137 | Comments are delimited with /* ... */. | |
| 138 | Paragraphs are separated by blank lines only. | |
| 139 | Delete converts tabs to spaces as it moves back. | |
| 140 | \\{c-mode-map} | |
| 141 | Variables controlling indentation style: | |
| 142 | c-tab-always-indent | |
| 143 | Non-nil means TAB in C mode should always reindent the current line, | |
| 144 | regardless of where in the line point is when the TAB command is used. | |
| 145 | c-auto-newline | |
| 146 | Non-nil means automatically newline before and after braces, | |
| 147 | and after colons and semicolons, inserted in C code. | |
| 148 | c-indent-level | |
| 149 | Indentation of C statements within surrounding block. | |
| 150 | The surrounding block's indentation is the indentation | |
| 151 | of the line on which the open-brace appears. | |
| 152 | c-continued-statement-offset | |
| 153 | Extra indentation given to a substatement, such as the | |
| 154 | then-clause of an if or body of a while. | |
| 155 | c-continued-brace-offset | |
| 156 | Extra indentation given to a brace that starts a substatement. | |
| 157 | This is in addition to c-continued-statement-offset. | |
| 158 | c-brace-offset | |
| 159 | Extra indentation for line if it starts with an open brace. | |
| 160 | c-brace-imaginary-offset | |
| 161 | An open brace following other text is treated as if it were | |
| 162 | this far to the right of the start of its line. | |
| 163 | c-argdecl-indent | |
| 164 | Indentation level of declarations of C function arguments. | |
| 165 | c-label-offset | |
| 166 | Extra indentation for line that is a label, or case or default. | |
| 167 | ||
| 168 | Settings for K&R and BSD indentation styles are | |
| 169 | c-indent-level 5 8 | |
| 170 | c-continued-statement-offset 5 8 | |
| 171 | c-brace-offset -5 -8 | |
| 172 | c-argdecl-indent 0 8 | |
| 173 | c-label-offset -5 -8 | |
| 174 | ||
| 175 | Turning on C mode calls the value of the variable c-mode-hook with no args, | |
| 176 | if that value is non-nil." | |
| 177 | (interactive) | |
| 178 | (kill-all-local-variables) | |
| 179 | (use-local-map c-mode-map) | |
| 180 | (setq major-mode 'c-mode) | |
| 181 | (setq mode-name "C") | |
| 182 | (setq local-abbrev-table c-mode-abbrev-table) | |
| 183 | (set-syntax-table c-mode-syntax-table) | |
| 184 | (make-local-variable 'paragraph-start) | |
| 185 | (setq paragraph-start (concat "^$\\|" page-delimiter)) | |
| 186 | (make-local-variable 'paragraph-separate) | |
| 187 | (setq paragraph-separate paragraph-start) | |
| 188 | (make-local-variable 'paragraph-ignore-fill-prefix) | |
| 189 | (setq paragraph-ignore-fill-prefix t) | |
| 190 | (make-local-variable 'indent-line-function) | |
| 191 | (setq indent-line-function 'c-indent-line) | |
| 192 | (make-local-variable 'indent-region-function) | |
| 193 | (setq indent-region-function 'c-indent-region) | |
| 194 | (make-local-variable 'require-final-newline) | |
| 195 | (setq require-final-newline t) | |
| 196 | (make-local-variable 'comment-start) | |
| 197 | (setq comment-start "/* ") | |
| 198 | (make-local-variable 'comment-end) | |
| 199 | (setq comment-end " */") | |
| 200 | (make-local-variable 'comment-column) | |
| 201 | (setq comment-column 32) | |
| 202 | (make-local-variable 'comment-start-skip) | |
| 203 | (setq comment-start-skip "/\\*+ *") | |
| 204 | (make-local-variable 'comment-indent-hook) | |
| 205 | (setq comment-indent-hook 'c-comment-indent) | |
| 206 | (make-local-variable 'parse-sexp-ignore-comments) | |
| 207 | (setq parse-sexp-ignore-comments t) | |
| 208 | (run-hooks 'c-mode-hook)) | |
| 209 | \f | |
| 210 | ;; This is used by indent-for-comment | |
| 211 | ;; to decide how much to indent a comment in C code | |
| 212 | ;; based on its context. | |
| 213 | (defun c-comment-indent () | |
| 214 | (if (looking-at "^/\\*") | |
| 215 | 0 ;Existing comment at bol stays there. | |
| 216 | (let ((opoint (point))) | |
| 217 | (save-excursion | |
| 218 | (beginning-of-line) | |
| 219 | (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)") | |
| 220 | ;; A comment following a solitary close-brace | |
| 221 | ;; should have only one space. | |
| 222 | (search-forward "}") | |
| 223 | (1+ (current-column))) | |
| 224 | ((or (looking-at "^#[ \t]*endif[ \t]*") | |
| 225 | (looking-at "^#[ \t]*else[ \t]*")) | |
| 226 | 7) ;2 spaces after #endif | |
| 227 | ((progn | |
| 228 | (goto-char opoint) | |
| 229 | (skip-chars-backward " \t") | |
| 230 | (and (= comment-column 0) (bolp))) | |
| 231 | ;; If comment-column is 0, and nothing but space | |
| 232 | ;; before the comment, align it at 0 rather than 1. | |
| 233 | 0) | |
| 234 | (t | |
| 235 | (max (1+ (current-column)) ;Else indent at comment column | |
| 236 | comment-column))))))) ; except leave at least one space. | |
| 237 | ||
| 238 | (defun c-fill-paragraph (&optional arg) | |
| 239 | "Like \\[fill-paragraph] but handle C comments. | |
| 240 | If point is inside a comment, the current paragraph of the comment | |
| 241 | is filled, preserving the comment indentation or line-starting decorations." | |
| 242 | (interactive "P") | |
| 243 | (let ((first-line | |
| 244 | (save-excursion | |
| 245 | (beginning-of-line) | |
| 246 | (skip-chars-forward " \t") | |
| 247 | (looking-at comment-start-skip)))) | |
| 248 | (if (or first-line | |
| 249 | (eq (calculate-c-indent) t)) | |
| 250 | ;; Inside a comment: fill one comment paragraph. | |
| 251 | (let ((fill-prefix | |
| 252 | ;; The prefix for each line of this paragraph | |
| 253 | ;; is the appropriate part of the start of this line, | |
| 254 | ;; up to the column at which text should be indented. | |
| 255 | (save-excursion | |
| 256 | (beginning-of-line) | |
| 257 | (if (looking-at "[ \t]*/\\*.*\\*/") | |
| 258 | (progn (re-search-forward comment-start-skip) | |
| 259 | (make-string (current-column) ?\ )) | |
| 260 | (if first-line (forward-line 1)) | |
| 261 | (buffer-substring (point) | |
| 262 | (progn | |
| 263 | (move-to-column | |
| 264 | (calculate-c-indent-within-comment t) | |
| 265 | t) | |
| 266 | (point)))))) | |
| 267 | (paragraph-start | |
| 268 | ;; Lines containing just a comment start or just an end | |
| 269 | ;; should not be filled into paragraphs they are next to. | |
| 270 | (concat paragraph-start | |
| 271 | "\\|^[ \t]*/\\*[ \t]*$\\|^[ \t]*\\*/[ \t]*$\\|^[^ \t/*]")) | |
| 272 | (paragraph-separate | |
| 273 | (concat paragraph-separate | |
| 274 | "\\|^[ \t]*/\\*[ \t]*$\\|^[ \t]*\\*/[ \t]*$\\|^[^ \t/*]"))) | |
| 275 | (save-restriction | |
| 276 | ;; Don't fill the comment together with the code following it. | |
| 277 | (narrow-to-region (point-min) | |
| 278 | (save-excursion | |
| 279 | (search-forward "*/" nil 'move) | |
| 280 | (forward-line 1) | |
| 281 | (point))) | |
| 282 | (fill-paragraph arg) | |
| 283 | (save-excursion | |
| 284 | (search-forward "*/") | |
| 285 | (beginning-of-line) | |
| 286 | (if (looking-at "[ \t]*\\*/") | |
| 287 | (delete-indentation))))) | |
| 288 | ;; Outside of comments: do ordinary filling. | |
| 289 | (fill-paragraph arg)))) | |
| 290 | ||
| 291 | (defun electric-c-brace (arg) | |
| 292 | "Insert character and correct line's indentation." | |
| 293 | (interactive "P") | |
| 294 | (let (insertpos) | |
| 295 | (if (and (not arg) | |
| 296 | (eolp) | |
| 297 | (or (save-excursion | |
| 298 | (skip-chars-backward " \t") | |
| 299 | (bolp)) | |
| 300 | (if c-auto-newline (progn (c-indent-line) (newline) t) nil))) | |
| 301 | (progn | |
| 302 | (insert last-command-char) | |
| 303 | (c-indent-line) | |
| 304 | (if c-auto-newline | |
| 305 | (progn | |
| 306 | (newline) | |
| 307 | ;; (newline) may have done auto-fill | |
| 308 | (setq insertpos (- (point) 2)) | |
| 309 | (c-indent-line))) | |
| 310 | (save-excursion | |
| 311 | (if insertpos (goto-char (1+ insertpos))) | |
| 312 | (delete-char -1)))) | |
| 313 | (if insertpos | |
| 314 | (save-excursion | |
| 315 | (goto-char insertpos) | |
| 316 | (self-insert-command (prefix-numeric-value arg))) | |
| 317 | (self-insert-command (prefix-numeric-value arg))))) | |
| 318 | ||
| 319 | (defun electric-c-sharp-sign (arg) | |
| 320 | "Insert character and correct line's indentation." | |
| 321 | (interactive "P") | |
| 322 | (if (save-excursion | |
| 323 | (skip-chars-backward " \t") | |
| 324 | (bolp)) | |
| 325 | (let ((c-auto-newline nil)) | |
| 326 | (electric-c-terminator arg)) | |
| 327 | (self-insert-command (prefix-numeric-value arg)))) | |
| 328 | ||
| 329 | (defun electric-c-semi (arg) | |
| 330 | "Insert character and correct line's indentation." | |
| 331 | (interactive "P") | |
| 332 | (if c-auto-newline | |
| 333 | (electric-c-terminator arg) | |
| 334 | (self-insert-command (prefix-numeric-value arg)))) | |
| 335 | ||
| 336 | (defun electric-c-terminator (arg) | |
| 337 | "Insert character and correct line's indentation." | |
| 338 | (interactive "P") | |
| 339 | (let (insertpos (end (point))) | |
| 340 | (if (and (not arg) (eolp) | |
| 341 | (not (save-excursion | |
| 342 | (beginning-of-line) | |
| 343 | (skip-chars-forward " \t") | |
| 344 | (or (= (following-char) ?#) | |
| 345 | ;; Colon is special only after a label, or case .... | |
| 346 | ;; So quickly rule out most other uses of colon | |
| 347 | ;; and do no indentation for them. | |
| 348 | (and (eq last-command-char ?:) | |
| 349 | (not (looking-at "case[ \t'/(]\\|default\\>")) | |
| 350 | (save-excursion | |
| 351 | (skip-chars-forward "a-zA-Z0-9_$") | |
| 352 | (skip-chars-forward " \t") | |
| 353 | (< (point) end))) | |
| 354 | (progn | |
| 355 | (beginning-of-defun) | |
| 356 | (let ((pps (parse-partial-sexp (point) end))) | |
| 357 | (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))))) | |
| 358 | (progn | |
| 359 | (insert last-command-char) | |
| 360 | (c-indent-line) | |
| 361 | (and c-auto-newline | |
| 362 | (not (c-inside-parens-p)) | |
| 363 | (progn | |
| 364 | (newline) | |
| 365 | ;; (newline) may have done auto-fill | |
| 366 | (setq insertpos (- (point) 2)) | |
| 367 | (c-indent-line))) | |
| 368 | (save-excursion | |
| 369 | (if insertpos (goto-char (1+ insertpos))) | |
| 370 | (delete-char -1)))) | |
| 371 | (if insertpos | |
| 372 | (save-excursion | |
| 373 | (goto-char insertpos) | |
| 374 | (self-insert-command (prefix-numeric-value arg))) | |
| 375 | (self-insert-command (prefix-numeric-value arg))))) | |
| 376 | ||
| 377 | (defun c-inside-parens-p () | |
| 378 | (condition-case () | |
| 379 | (save-excursion | |
| 380 | (save-restriction | |
| 381 | (narrow-to-region (point) | |
| 382 | (progn (beginning-of-defun) (point))) | |
| 383 | (goto-char (point-max)) | |
| 384 | (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\())) | |
| 385 | (error nil))) | |
| 386 | \f | |
| 387 | (defun c-indent-command (&optional whole-exp) | |
| 388 | "Indent current line as C code, or in some cases insert a tab character. | |
| 389 | If `c-tab-always-indent' is non-nil (the default), always indent current line. | |
| 390 | Otherwise, indent the current line only if point is at the left margin or | |
| 391 | in the line's indentation; otherwise insert a tab. | |
| 392 | ||
| 393 | A numeric argument, regardless of its value, means indent rigidly all the | |
| 394 | lines of the expression starting after point so that this line becomes | |
| 395 | properly indented. The relative indentation among the lines of the | |
| 396 | expression are preserved." | |
| 397 | (interactive "P") | |
| 398 | (if whole-exp | |
| 399 | ;; If arg, always indent this line as C | |
| 400 | ;; and shift remaining lines of expression the same amount. | |
| 401 | (let ((shift-amt (c-indent-line)) | |
| 402 | beg end) | |
| 403 | (save-excursion | |
| 404 | (if c-tab-always-indent | |
| 405 | (beginning-of-line)) | |
| 406 | ;; Find beginning of following line. | |
| 407 | (save-excursion | |
| 408 | (forward-line 1) (setq beg (point))) | |
| 409 | ;; Find first beginning-of-sexp for sexp extending past this line. | |
| 410 | (while (< (point) beg) | |
| 411 | (forward-sexp 1) | |
| 412 | (setq end (point)) | |
| 413 | (skip-chars-forward " \t\n"))) | |
| 414 | (if (> end beg) | |
| 415 | (indent-code-rigidly beg end shift-amt "#"))) | |
| 416 | (if (and (not c-tab-always-indent) | |
| 417 | (save-excursion | |
| 418 | (skip-chars-backward " \t") | |
| 419 | (not (bolp)))) | |
| 420 | (insert-tab) | |
| 421 | (c-indent-line)))) | |
| 422 | ||
| 423 | (defun c-indent-line () | |
| 424 | "Indent current line as C code. | |
| 425 | Return the amount the indentation changed by." | |
| 426 | (let ((indent (calculate-c-indent nil)) | |
| 427 | beg shift-amt | |
| 428 | (case-fold-search nil) | |
| 429 | (pos (- (point-max) (point)))) | |
| 430 | (beginning-of-line) | |
| 431 | (setq beg (point)) | |
| 432 | (cond ((eq indent nil) | |
| 433 | (setq indent (current-indentation))) | |
| 434 | ((eq indent t) | |
| 435 | (setq indent (calculate-c-indent-within-comment))) | |
| 436 | ((looking-at "[ \t]*#") | |
| 437 | (setq indent 0)) | |
| 438 | (t | |
| 439 | (skip-chars-forward " \t") | |
| 440 | (if (listp indent) (setq indent (car indent))) | |
| 441 | (cond ((or (looking-at "case[ \t'/(]\\|default\\>") | |
| 442 | (and (looking-at "[A-Za-z]") | |
| 443 | (save-excursion | |
| 444 | (forward-sexp 1) | |
| 445 | (looking-at ":")))) | |
| 446 | (setq indent (max 1 (+ indent c-label-offset)))) | |
| 447 | ((and (looking-at "else\\b") | |
| 448 | (not (looking-at "else\\s_"))) | |
| 449 | (setq indent (save-excursion | |
| 450 | (c-backward-to-start-of-if) | |
| 451 | (current-indentation)))) | |
| 452 | ((looking-at "}[ \t]*else") | |
| 453 | (setq indent (save-excursion | |
| 454 | (forward-char) | |
| 455 | (backward-sexp) | |
| 456 | (current-indentation)))) | |
| 457 | ((and (looking-at "while\\b") | |
| 458 | (save-excursion | |
| 459 | (c-backward-to-start-of-do))) | |
| 460 | ;; This is a `while' that ends a do-while. | |
| 461 | (setq indent (save-excursion | |
| 462 | (c-backward-to-start-of-do) | |
| 463 | (current-indentation)))) | |
| 464 | ((= (following-char) ?}) | |
| 465 | (setq indent (- indent c-indent-level))) | |
| 466 | ((= (following-char) ?{) | |
| 467 | (setq indent (+ indent c-brace-offset)))))) | |
| 468 | (skip-chars-forward " \t") | |
| 469 | (setq shift-amt (- indent (current-column))) | |
| 470 | (if (zerop shift-amt) | |
| 471 | (if (> (- (point-max) pos) (point)) | |
| 472 | (goto-char (- (point-max) pos))) | |
| 473 | (delete-region beg (point)) | |
| 474 | (indent-to indent) | |
| 475 | ;; If initial point was within line's indentation, | |
| 476 | ;; position after the indentation. Else stay at same point in text. | |
| 477 | (if (> (- (point-max) pos) (point)) | |
| 478 | (goto-char (- (point-max) pos)))) | |
| 479 | shift-amt)) | |
| 480 | ||
| 481 | (defun calculate-c-indent (&optional parse-start) | |
| 482 | "Return appropriate indentation for current line as C code. | |
| 483 | In usual case returns an integer: the column to indent to. | |
| 484 | Returns nil if line starts inside a string, t if in a comment." | |
| 485 | (save-excursion | |
| 486 | (beginning-of-line) | |
| 487 | (let ((indent-point (point)) | |
| 488 | (case-fold-search nil) | |
| 489 | state | |
| 490 | containing-sexp) | |
| 491 | (if parse-start | |
| 492 | (goto-char parse-start) | |
| 493 | (beginning-of-defun)) | |
| 494 | (while (< (point) indent-point) | |
| 495 | (setq parse-start (point)) | |
| 496 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
| 497 | (setq containing-sexp (car (cdr state)))) | |
| 498 | (cond ((or (nth 3 state) (nth 4 state)) | |
| 499 | ;; return nil or t if should not change this line | |
| 500 | (nth 4 state)) | |
| 501 | ((null containing-sexp) | |
| 502 | ;; Line is at top level. May be data or function definition, | |
| 503 | ;; or may be function argument declaration. | |
| 504 | ;; Indent like the previous top level line | |
| 505 | ;; unless that ends in a closeparen without semicolon, | |
| 506 | ;; in which case this line is the first argument decl. | |
| 507 | (goto-char indent-point) | |
| 508 | (skip-chars-forward " \t") | |
| 509 | (if (= (following-char) ?{) | |
| 510 | 0 ; Unless it starts a function body | |
| 511 | (c-backward-to-noncomment (or parse-start (point-min))) | |
| 512 | ;; Look at previous line that's at column 0 | |
| 513 | ;; to determine whether we are in top-level decls | |
| 514 | ;; or function's arg decls. Set basic-indent accordingly. | |
| 515 | (let ((basic-indent | |
| 516 | (save-excursion | |
| 517 | (re-search-backward "^[^ \^L\t\n#]" nil 'move) | |
| c763f396 RS |
518 | (let (comment lim) |
| 519 | (if (and (looking-at "\\sw\\|\\s_") | |
| 520 | (looking-at "[^\"\n=]*(") | |
| 521 | (progn | |
| 522 | (goto-char (1- (match-end 0))) | |
| 523 | (setq lim (point)) | |
| 524 | (forward-sexp 1) | |
| 525 | (skip-chars-forward " \t\f") | |
| 526 | (and (< (point) indent-point) | |
| 527 | (not (memq (following-char) | |
| 528 | '(?\, ?\;))))) | |
| 529 | ;; Make sure the "function decl" we found | |
| 530 | ;; is not inside a comment. | |
| 531 | (progn | |
| 532 | (beginning-of-line) | |
| 533 | (while (and (not comment) | |
| 534 | (search-forward "/*" lim t)) | |
| 535 | (setq comment | |
| 536 | (not (search-forward "*/" lim t)))) | |
| 537 | (not comment))) | |
| 538 | c-argdecl-indent 0))))) | |
| a17915dc ER |
539 | basic-indent))) |
| 540 | ||
| 541 | ;; ;; Now add a little if this is a continuation line. | |
| 542 | ;; (+ basic-indent (if (or (bobp) | |
| 543 | ;; (memq (preceding-char) '(?\) ?\; ?\})) | |
| 544 | ;; ;; Line with zero indentation | |
| 545 | ;; ;; is probably the return-type | |
| 546 | ;; ;; of a function definition, | |
| 547 | ;; ;; so following line is function name. | |
| 548 | ;; (= (current-indentation) 0)) | |
| 549 | ;; 0 c-continued-statement-offset)) | |
| 550 | ||
| 551 | ((/= (char-after containing-sexp) ?{) | |
| 552 | ;; line is expression, not statement: | |
| 553 | ;; indent to just after the surrounding open. | |
| 554 | (goto-char (1+ containing-sexp)) | |
| 555 | (current-column)) | |
| 556 | (t | |
| 557 | ;; Statement level. Is it a continuation or a new statement? | |
| 558 | ;; Find previous non-comment character. | |
| 559 | (goto-char indent-point) | |
| 560 | (c-backward-to-noncomment containing-sexp) | |
| 561 | ;; Back up over label lines, since they don't | |
| 562 | ;; affect whether our line is a continuation. | |
| 563 | (while (or (eq (preceding-char) ?\,) | |
| 564 | (and (eq (preceding-char) ?:) | |
| 565 | (or (eq (char-after (- (point) 2)) ?\') | |
| 566 | (memq (char-syntax (char-after (- (point) 2))) | |
| 567 | '(?w ?_))))) | |
| 568 | (if (eq (preceding-char) ?\,) | |
| 569 | (progn (forward-char -1) | |
| 570 | (c-backward-to-start-of-continued-exp containing-sexp))) | |
| 571 | (beginning-of-line) | |
| 572 | (c-backward-to-noncomment containing-sexp)) | |
| 573 | ;; Check for a preprocessor statement or its continuation lines. | |
| 574 | ;; Move back to end of previous non-preprocessor line. | |
| 575 | (let ((found (point)) stop) | |
| 576 | (while (not stop) | |
| 577 | (cond ((save-excursion (end-of-line 0) | |
| 578 | (= (preceding-char) ?\\)) | |
| 579 | (end-of-line 0)) | |
| 580 | ;; This line is not preceded by a backslash. | |
| 581 | ;; So either it starts a preprocessor command | |
| 582 | ;; or any following continuation lines | |
| 583 | ;; should not be skipped. | |
| 584 | ((progn (beginning-of-line) (= (following-char) ?#)) | |
| 585 | (end-of-line 0) | |
| 586 | (setq found (point))) | |
| 587 | (t (setq stop t)))) | |
| 588 | (goto-char found)) | |
| 589 | ;; Now we get the answer. | |
| 590 | (if (and (not (memq (preceding-char) '(nil ?\, ?\; ?\} ?\{))) | |
| 591 | ;; But don't treat a line with a close-brace | |
| 592 | ;; as a continuation. It is probably the | |
| 593 | ;; end of an enum type declaration. | |
| 594 | (save-excursion | |
| 595 | (goto-char indent-point) | |
| 596 | (skip-chars-forward " \t") | |
| 597 | (not (= (following-char) ?})))) | |
| 598 | ;; This line is continuation of preceding line's statement; | |
| 599 | ;; indent c-continued-statement-offset more than the | |
| 600 | ;; previous line of the statement. | |
| 601 | (progn | |
| 602 | (c-backward-to-start-of-continued-exp containing-sexp) | |
| 603 | (+ c-continued-statement-offset (current-column) | |
| 604 | (if (save-excursion (goto-char indent-point) | |
| 605 | (skip-chars-forward " \t") | |
| 606 | (eq (following-char) ?{)) | |
| 607 | c-continued-brace-offset 0))) | |
| 608 | ;; This line starts a new statement. | |
| 609 | ;; Position following last unclosed open. | |
| 610 | (goto-char containing-sexp) | |
| 611 | ;; Is line first statement after an open-brace? | |
| 612 | (or | |
| 613 | ;; If no, find that first statement and indent like it. | |
| 614 | (save-excursion | |
| 615 | (forward-char 1) | |
| 616 | (let ((colon-line-end 0)) | |
| 617 | (while (progn (skip-chars-forward " \t\n") | |
| 618 | (looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:")) | |
| 619 | ;; Skip over comments and labels following openbrace. | |
| 620 | (cond ((= (following-char) ?\#) | |
| 621 | (forward-line 1)) | |
| 622 | ((= (following-char) ?\/) | |
| 623 | (forward-char 2) | |
| 624 | (search-forward "*/" nil 'move)) | |
| 625 | ;; case or label: | |
| 626 | (t | |
| 627 | (save-excursion (end-of-line) | |
| 628 | (setq colon-line-end (point))) | |
| 629 | (search-forward ":")))) | |
| 630 | ;; The first following code counts | |
| 631 | ;; if it is before the line we want to indent. | |
| 632 | (and (< (point) indent-point) | |
| 633 | (if (> colon-line-end (point)) | |
| 634 | (- (current-indentation) c-label-offset) | |
| 635 | (current-column))))) | |
| 636 | ;; If no previous statement, | |
| 637 | ;; indent it relative to line brace is on. | |
| 638 | ;; For open brace in column zero, don't let statement | |
| 639 | ;; start there too. If c-indent-level is zero, | |
| 640 | ;; use c-brace-offset + c-continued-statement-offset instead. | |
| 641 | ;; For open-braces not the first thing in a line, | |
| 642 | ;; add in c-brace-imaginary-offset. | |
| 643 | (+ (if (and (bolp) (zerop c-indent-level)) | |
| 644 | (+ c-brace-offset c-continued-statement-offset) | |
| 645 | c-indent-level) | |
| 646 | ;; Move back over whitespace before the openbrace. | |
| 647 | ;; If openbrace is not first nonwhite thing on the line, | |
| 648 | ;; add the c-brace-imaginary-offset. | |
| 649 | (progn (skip-chars-backward " \t") | |
| 650 | (if (bolp) 0 c-brace-imaginary-offset)) | |
| 651 | ;; If the openbrace is preceded by a parenthesized exp, | |
| 652 | ;; move to the beginning of that; | |
| 653 | ;; possibly a different line | |
| 654 | (progn | |
| 655 | (if (eq (preceding-char) ?\)) | |
| 656 | (forward-sexp -1)) | |
| 657 | ;; Get initial indentation of the line we are on. | |
| 658 | (current-indentation)))))))))) | |
| 659 | ||
| 660 | (defun calculate-c-indent-within-comment (&optional after-star) | |
| 661 | "Return the indentation amount for line inside a block comment. | |
| 662 | Optional arg AFTER-STAR means, if lines in the comment have a leading star, | |
| 663 | return the indentation of the text that would follow this star." | |
| 664 | (let (end star-start) | |
| 665 | (save-excursion | |
| 666 | (beginning-of-line) | |
| 667 | (skip-chars-forward " \t") | |
| 668 | (setq star-start (= (following-char) ?\*)) | |
| 669 | (skip-chars-backward " \t\n") | |
| 670 | (setq end (point)) | |
| 671 | (beginning-of-line) | |
| 672 | (skip-chars-forward " \t") | |
| 673 | (if after-star | |
| 674 | (and (looking-at "\\*") | |
| 675 | (re-search-forward "\\*[ \t]*"))) | |
| 676 | (and (re-search-forward "/\\*[ \t]*" end t) | |
| 677 | star-start | |
| 678 | (not after-star) | |
| 679 | (goto-char (1+ (match-beginning 0)))) | |
| 680 | (if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*)) | |
| 681 | (1+ (current-column)) | |
| 682 | (current-column))))) | |
| 683 | ||
| 684 | ||
| 685 | (defun c-backward-to-noncomment (lim) | |
| 686 | (let (opoint stop) | |
| 687 | (while (not stop) | |
| 688 | (skip-chars-backward " \t\n\f" lim) | |
| 689 | (setq opoint (point)) | |
| 690 | (if (and (>= (point) (+ 2 lim)) | |
| 691 | (save-excursion | |
| 692 | (forward-char -2) | |
| 693 | (looking-at "\\*/"))) | |
| 694 | (search-backward "/*" lim 'move) | |
| 695 | (setq stop (or (<= (point) lim) | |
| 696 | (save-excursion | |
| 697 | (beginning-of-line) | |
| 698 | (skip-chars-forward " \t") | |
| 699 | (not (looking-at "#"))))) | |
| 700 | (or stop (beginning-of-line)))))) | |
| 701 | ||
| 702 | (defun c-backward-to-start-of-continued-exp (lim) | |
| 703 | (if (memq (preceding-char) '(?\) ?\")) | |
| 704 | (forward-sexp -1)) | |
| 705 | (beginning-of-line) | |
| 706 | (if (<= (point) lim) | |
| 707 | (goto-char (1+ lim))) | |
| 708 | (skip-chars-forward " \t")) | |
| 709 | ||
| 710 | (defun c-backward-to-start-of-if (&optional limit) | |
| 711 | "Move to the start of the last \"unbalanced\" `if'." | |
| 712 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
| 713 | (let ((if-level 1) | |
| 714 | (case-fold-search nil)) | |
| 715 | (while (and (not (bobp)) (not (zerop if-level))) | |
| 716 | (backward-sexp 1) | |
| 717 | (cond ((looking-at "else\\b") | |
| 718 | (setq if-level (1+ if-level))) | |
| 719 | ((looking-at "if\\b") | |
| 720 | (setq if-level (1- if-level))) | |
| 721 | ((< (point) limit) | |
| 722 | (setq if-level 0) | |
| 723 | (goto-char limit)))))) | |
| 724 | ||
| 725 | (defun c-backward-to-start-of-do (&optional limit) | |
| 726 | "If point follows a `do' statement, move to beginning of it and return t. | |
| 727 | Otherwise return nil and don't move point." | |
| 728 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
| 729 | (let ((first t) | |
| 730 | (startpos (point)) | |
| 731 | (done nil)) | |
| 732 | (while (not done) | |
| 733 | (let ((next-start (point))) | |
| 734 | (condition-case nil | |
| 735 | ;; Move back one token or one brace or paren group. | |
| 736 | (backward-sexp 1) | |
| 737 | ;; If we find an open-brace, we lose. | |
| 738 | (error (setq done 'fail))) | |
| 739 | (if done | |
| 740 | nil | |
| 741 | ;; If we reached a `do', we win. | |
| 742 | (if (looking-at "do\\b") | |
| 743 | (setq done 'succeed) | |
| 744 | ;; Otherwise, if we skipped a semicolon, we lose. | |
| 745 | ;; (Exception: we can skip one semicolon before getting | |
| 746 | ;; to a the last token of the statement, unless that token | |
| 747 | ;; is a close brace.) | |
| 748 | (if (save-excursion | |
| 749 | (forward-sexp 1) | |
| 750 | (or (and (not first) (= (preceding-char) ?})) | |
| 751 | (search-forward ";" next-start t | |
| 752 | (if (and first | |
| 753 | (/= (preceding-char) ?})) | |
| 754 | 2 1)))) | |
| 755 | (setq done 'fail) | |
| 756 | (setq first nil) | |
| 757 | ;; If we go too far back in the buffer, we lose. | |
| 758 | (if (< (point) limit) | |
| 759 | (setq done 'fail))))))) | |
| 760 | (if (eq done 'succeed) | |
| 761 | t | |
| 762 | (goto-char startpos) | |
| 763 | nil))) | |
| 764 | \f | |
| 765 | (defun c-beginning-of-statement (count) | |
| 766 | "Go to the beginning of the innermost C statement. | |
| 767 | With prefix arg, go back N - 1 statements. If already at the beginning of a | |
| 768 | statement then go to the beginning of the preceeding one." | |
| 769 | (interactive "p") | |
| 770 | (while (> count 0) | |
| 771 | (c-beginning-of-statement-1) | |
| 772 | (setq count (1- count))) | |
| 773 | (while (< count 0) | |
| 774 | (c-end-of-statement-1) | |
| 775 | (setq count (1+ count)))) | |
| 776 | ||
| 777 | (defun c-end-of-statement (count) | |
| 778 | "Go to the end of the innermost C statement. | |
| 779 | With prefix arg, go forward N - 1 statements. Moves forward to end of the | |
| 780 | next statement if already at end." | |
| 781 | (interactive "p") | |
| 782 | (c-beginning-of-statement (- count))) | |
| 783 | ||
| 784 | (defun c-beginning-of-statement-1 () | |
| 785 | (let ((last-begin (point)) | |
| 786 | (first t)) | |
| 787 | (condition-case () | |
| 788 | (progn | |
| 789 | (while (and (not (bobp)) | |
| 790 | (progn | |
| 791 | (backward-sexp 1) | |
| 792 | (or first | |
| 793 | (not (re-search-forward "[;{}]" last-begin t))))) | |
| 794 | (setq last-begin (point) first nil)) | |
| 795 | (goto-char last-begin)) | |
| 796 | (error (if first (backward-up-list 1) (goto-char last-begin)))))) | |
| 797 | ||
| 798 | (defun c-end-of-statement-1 () | |
| 799 | (condition-case () | |
| 800 | (progn | |
| 801 | (while (and (not (eobp)) | |
| 802 | (let ((beg (point))) | |
| 803 | (forward-sexp 1) | |
| 804 | (let ((end (point))) | |
| 805 | (save-excursion | |
| 806 | (goto-char beg) | |
| 807 | (not (re-search-forward "[;{}]" end t))))))) | |
| 808 | (re-search-backward "[;}]") | |
| 809 | (forward-char 1)) | |
| 810 | (error | |
| 811 | (let ((beg (point))) | |
| 812 | (backward-up-list -1) | |
| 813 | (let ((end (point))) | |
| 814 | (goto-char beg) | |
| 815 | (search-forward ";" end 'move)))))) | |
| 816 | \f | |
| 817 | (defun mark-c-function () | |
| 818 | "Put mark at end of C function, point at beginning." | |
| 819 | (interactive) | |
| 820 | (push-mark (point)) | |
| 821 | (end-of-defun) | |
| 822 | (push-mark (point)) | |
| 823 | (beginning-of-defun) | |
| 824 | (backward-paragraph)) | |
| 825 | \f | |
| 826 | (defun indent-c-exp (&optional endpos) | |
| 827 | "Indent each line of the C grouping following point. | |
| 828 | If optional arg ENDPOS is given, indent each line, stopping when | |
| 829 | ENDPOS is encountered." | |
| 830 | (interactive) | |
| 831 | (let* ((indent-stack (list nil)) | |
| 832 | (opoint (point)) ;; May be altered below. | |
| 833 | (contain-stack | |
| 834 | (list (if endpos | |
| 835 | (let (funbeg) | |
| 836 | ;; Find previous fcn-start. | |
| 837 | (save-excursion (forward-char 1) | |
| 838 | (beginning-of-defun) | |
| 839 | (setq funbeg (point))) | |
| 840 | ;; Try to find containing open, | |
| 841 | ;; but don't scan past that fcn-start. | |
| 842 | (save-restriction | |
| 843 | (narrow-to-region funbeg (point)) | |
| 844 | (condition-case nil | |
| 845 | (save-excursion | |
| 846 | (backward-up-list 1) (point)) | |
| 847 | ;; We gave up: must be between fcns. | |
| 848 | ;; Set opoint to beg of prev fcn | |
| 849 | ;; since otherwise calculate-c-indent | |
| 850 | ;; will get wrong answers. | |
| 851 | (error (setq opoint funbeg) | |
| 852 | (point))))) | |
| 853 | (point)))) | |
| 854 | (case-fold-search nil) | |
| 855 | restart outer-loop-done inner-loop-done state ostate | |
| 856 | this-indent last-sexp | |
| 857 | at-else at-brace at-while | |
| 858 | last-depth | |
| 859 | (next-depth 0)) | |
| 860 | ;; If the braces don't match, get an error right away. | |
| 861 | (save-excursion | |
| 862 | (forward-sexp 1)) | |
| 863 | ;; Realign the comment on the first line, even though we don't reindent it. | |
| 864 | (save-excursion | |
| 865 | (let ((beg (point))) | |
| 866 | (and (re-search-forward | |
| 867 | comment-start-skip | |
| 868 | (save-excursion (end-of-line) (point)) t) | |
| 869 | ;; Make sure the comment starter we found | |
| 870 | ;; is not actually in a string or quoted. | |
| 871 | (let ((new-state | |
| 872 | (parse-partial-sexp beg (point) | |
| 873 | nil nil state))) | |
| 874 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
| 875 | (progn (indent-for-comment) (beginning-of-line))))) | |
| 876 | (save-excursion | |
| 877 | (setq outer-loop-done nil) | |
| 878 | (while (and (not (eobp)) | |
| 879 | (if endpos (< (point) endpos) | |
| 880 | (not outer-loop-done))) | |
| 881 | (setq last-depth next-depth) | |
| 882 | ;; Compute how depth changes over this line | |
| 883 | ;; plus enough other lines to get to one that | |
| 884 | ;; does not end inside a comment or string. | |
| 885 | ;; Meanwhile, do appropriate indentation on comment lines. | |
| 886 | (setq inner-loop-done nil) | |
| 887 | (while (and (not inner-loop-done) | |
| 888 | (not (and (eobp) (setq outer-loop-done t)))) | |
| 889 | (setq ostate state) | |
| 890 | (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) | |
| 891 | nil nil state)) | |
| 892 | (setq next-depth (car state)) | |
| 893 | (if (and (car (cdr (cdr state))) | |
| 894 | (>= (car (cdr (cdr state))) 0)) | |
| 895 | (setq last-sexp (car (cdr (cdr state))))) | |
| 896 | (if (or (nth 4 ostate)) | |
| 897 | (c-indent-line)) | |
| 898 | (if (or (nth 3 state)) | |
| 899 | (forward-line 1) | |
| 900 | (setq inner-loop-done t))) | |
| 901 | (and endpos | |
| 902 | (while (< next-depth 0) | |
| 903 | (setq indent-stack (append indent-stack (list nil))) | |
| 904 | (setq contain-stack (append contain-stack (list nil))) | |
| 905 | (setq next-depth (1+ next-depth)) | |
| 906 | (setq last-depth (1+ last-depth)) | |
| 907 | (setcar (nthcdr 6 state) (1+ (nth 6 state))))) | |
| 908 | (setq outer-loop-done (and (not endpos) (<= next-depth 0))) | |
| 909 | (if outer-loop-done | |
| 910 | nil | |
| 911 | ;; If this line had ..))) (((.. in it, pop out of the levels | |
| 912 | ;; that ended anywhere in this line, even if the final depth | |
| 913 | ;; doesn't indicate that they ended. | |
| 914 | (while (> last-depth (nth 6 state)) | |
| 915 | (setq indent-stack (cdr indent-stack) | |
| 916 | contain-stack (cdr contain-stack) | |
| 917 | last-depth (1- last-depth))) | |
| 918 | (if (/= last-depth next-depth) | |
| 919 | (setq last-sexp nil)) | |
| 920 | ;; Add levels for any parens that were started in this line. | |
| 921 | (while (< last-depth next-depth) | |
| 922 | (setq indent-stack (cons nil indent-stack) | |
| 923 | contain-stack (cons nil contain-stack) | |
| 924 | last-depth (1+ last-depth))) | |
| 925 | (if (null (car contain-stack)) | |
| 926 | (setcar contain-stack (or (car (cdr state)) | |
| 927 | (save-excursion (forward-sexp -1) | |
| 928 | (point))))) | |
| 929 | (forward-line 1) | |
| 930 | (skip-chars-forward " \t") | |
| 931 | (if (eolp) | |
| 932 | nil | |
| 933 | (if (and (car indent-stack) | |
| 934 | (>= (car indent-stack) 0)) | |
| 935 | ;; Line is on an existing nesting level. | |
| 936 | ;; Lines inside parens are handled specially. | |
| 937 | (if (/= (char-after (car contain-stack)) ?{) | |
| 938 | (setq this-indent (car indent-stack)) | |
| 939 | ;; Line is at statement level. | |
| 940 | ;; Is it a new statement? Is it an else? | |
| 941 | ;; Find last non-comment character before this line | |
| 942 | (save-excursion | |
| 943 | (setq at-else (looking-at "else\\W")) | |
| 944 | (setq at-brace (= (following-char) ?{)) | |
| 945 | (setq at-while (looking-at "while\\b")) | |
| 946 | (c-backward-to-noncomment opoint) | |
| 947 | (if (not (memq (preceding-char) '(nil ?\, ?\; ?} ?: ?{))) | |
| 948 | ;; Preceding line did not end in comma or semi; | |
| 949 | ;; indent this line c-continued-statement-offset | |
| 950 | ;; more than previous. | |
| 951 | (progn | |
| 952 | (c-backward-to-start-of-continued-exp (car contain-stack)) | |
| 953 | (setq this-indent | |
| 954 | (+ c-continued-statement-offset (current-column) | |
| 955 | (if at-brace c-continued-brace-offset 0)))) | |
| 956 | ;; Preceding line ended in comma or semi; | |
| 957 | ;; use the standard indent for this level. | |
| 958 | (cond (at-else (progn (c-backward-to-start-of-if opoint) | |
| 959 | (setq this-indent | |
| 960 | (current-indentation)))) | |
| 961 | ((and at-while (c-backward-to-start-of-do opoint)) | |
| 962 | (setq this-indent (current-indentation))) | |
| 963 | (t (setq this-indent (car indent-stack))))))) | |
| 964 | ;; Just started a new nesting level. | |
| 965 | ;; Compute the standard indent for this level. | |
| 966 | (let ((val (calculate-c-indent | |
| 967 | (if (car indent-stack) | |
| 968 | (- (car indent-stack)) | |
| 969 | opoint)))) | |
| 970 | (setcar indent-stack | |
| 971 | (setq this-indent val)))) | |
| 972 | ;; Adjust line indentation according to its contents | |
| 973 | (if (or (looking-at "case[ \t'/(]\\|default\\>") | |
| 974 | (and (looking-at "[A-Za-z]") | |
| 975 | (save-excursion | |
| 976 | (forward-sexp 1) | |
| 977 | (looking-at ":")))) | |
| 978 | (setq this-indent (max 1 (+ this-indent c-label-offset)))) | |
| 979 | (if (= (following-char) ?}) | |
| 980 | (setq this-indent (- this-indent c-indent-level))) | |
| 981 | (if (= (following-char) ?{) | |
| 982 | (setq this-indent (+ this-indent c-brace-offset))) | |
| 983 | ;; Don't leave indentation in empty lines. | |
| 984 | (if (eolp) (setq this-indent 0)) | |
| 985 | ;; Put chosen indentation into effect. | |
| 986 | (or (= (current-column) this-indent) | |
| 987 | (= (following-char) ?\#) | |
| 988 | (progn | |
| 989 | (delete-region (point) (progn (beginning-of-line) (point))) | |
| 990 | (indent-to this-indent))) | |
| 991 | ;; Indent any comment following the text. | |
| 992 | (or (looking-at comment-start-skip) | |
| 993 | (let ((beg (point))) | |
| 994 | (and (re-search-forward | |
| 995 | comment-start-skip | |
| 996 | (save-excursion (end-of-line) (point)) t) | |
| 997 | ;; Make sure the comment starter we found | |
| 998 | ;; is not actually in a string or quoted. | |
| 999 | (let ((new-state | |
| 1000 | (parse-partial-sexp beg (point) | |
| 1001 | nil nil state))) | |
| 1002 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
| 1003 | (progn (indent-for-comment) (beginning-of-line))))))))))) | |
| 1004 | ||
| 1005 | ;; Look at all comment-start strings in the current line after point. | |
| 1006 | ;; Return t if one of them starts a real comment. | |
| 1007 | ;; This is not used yet, because indent-for-comment | |
| 1008 | ;; isn't smart enough to handle the cases this can find. | |
| 1009 | (defun indent-c-find-real-comment () | |
| 1010 | (let (win) | |
| 1011 | (while (and (not win) | |
| 1012 | (re-search-forward comment-start-skip | |
| 1013 | (save-excursion (end-of-line) (point)) | |
| 1014 | t)) | |
| 1015 | ;; Make sure the comment start is not quoted. | |
| 1016 | (let ((state-1 | |
| 1017 | (parse-partial-sexp | |
| 1018 | (save-excursion (beginning-of-line) (point)) | |
| 1019 | (point) nil nil state))) | |
| 1020 | (setq win (and (null (nth 3 state-1)) (null (nth 5 state-1)))))) | |
| 1021 | win)) | |
| 1022 | ||
| 1023 | ;; Indent every line whose first char is between START and END inclusive. | |
| 1024 | (defun c-indent-region (start end) | |
| 1025 | (save-excursion | |
| 1026 | (goto-char start) | |
| 1027 | (let ((endmark (copy-marker end))) | |
| 1028 | (and (bolp) (not (eolp)) | |
| 1029 | (c-indent-line)) | |
| 1030 | (indent-c-exp endmark) | |
| 1031 | (set-marker endmark nil)))) | |
| 1032 | \f | |
| 1832dbd1 | 1033 | (defun set-c-style (style &optional global) |
| a17915dc | 1034 | "Set C-mode variables to use one of several different indentation styles. |
| 1832dbd1 RS |
1035 | The arguments are a string representing the desired style |
| 1036 | and a flag which, if non-nil, means to set the style globally. | |
| 1037 | \(Interactively, the flag comes from the prefix argument.) | |
| 1038 | Available styles are GNU, K&R, BSD and Whitesmith. | |
| a17915dc | 1039 | (interactive (list (completing-read "Use which C indentation style? " |
| 1832dbd1 RS |
1040 | c-style-alist nil t) |
| 1041 | current-prefix-arg)) | |
| a17915dc | 1042 | (let ((vars (cdr (assoc style c-style-alist)))) |
| 1832dbd1 RS |
1043 | (or vars |
| 1044 | (error "Invalid C indentation style `%s'" style)) | |
| a17915dc | 1045 | (while vars |
| 1832dbd1 RS |
1046 | (or global |
| 1047 | (make-local-variable (car (car vars)))) | |
| a17915dc ER |
1048 | (set (car (car vars)) (cdr (car vars))) |
| 1049 | (setq vars (cdr vars))))) | |
| 1832dbd1 RS |
1050 | \f |
| 1051 | ;;; This page handles insertion and removal of backslashes for C macros. | |
| 1052 | ||
| 1053 | (defvar c-backslash-column 48 | |
| 1054 | "*Minimum column for end-of-line backslashes of macro definitions.") | |
| 1055 | ||
| 1056 | (defun c-backslash-region (from to delete-flag) | |
| 1057 | "Insert, align, or delete end-of-line backslashes on the lines in the region. | |
| 1058 | With no argument, inserts backslashes and aligns existing backslashes. | |
| 1059 | With an argument, deletes the backslashes. | |
| 1060 | ||
| 1061 | This function does not modify the last line of the region if the region ends | |
| 1062 | right at the start of the following line; it does not modify blank lines | |
| 1063 | at the start of the region. So you can put the region around an entire macro | |
| 1064 | definition and conveniently use this command." | |
| 1065 | (interactive "r\nP") | |
| 1066 | (save-excursion | |
| 1067 | (goto-char from) | |
| 1068 | (let ((column c-backslash-column) | |
| 1069 | (endmark (make-marker))) | |
| 1070 | (move-marker endmark to) | |
| 1071 | ;; Compute the smallest column number past the ends of all the lines. | |
| 1072 | (if (not delete-flag) | |
| 1073 | (while (< (point) to) | |
| 1074 | (end-of-line) | |
| 1075 | (if (= (preceding-char) ?\\) | |
| 1076 | (progn (forward-char -1) | |
| 1077 | (skip-chars-backward " \t"))) | |
| 1078 | (setq column (max column (1+ (current-column)))) | |
| 1079 | (forward-line 1))) | |
| 1080 | ;; Adjust upward to a tab column, if that doesn't push past the margin. | |
| 1081 | (if (> (% column tab-width) 0) | |
| 1082 | (let ((adjusted (* (/ (+ column tab-width -1) tab-width) tab-width))) | |
| 1083 | (if (< adjusted (window-width)) | |
| 1084 | (setq column adjusted)))) | |
| 1085 | ;; Don't modify blank lines at start of region. | |
| 1086 | (goto-char from) | |
| 1087 | (while (and (< (point) endmark) (eolp)) | |
| 1088 | (forward-line 1)) | |
| 1089 | ;; Add or remove backslashes on all the lines. | |
| 1090 | (while (and (< (point) endmark) | |
| 1091 | ;; Don't backslashify the last line | |
| 1092 | ;; if the region ends right at the start of the next line. | |
| 1093 | (save-excursion | |
| 1094 | (forward-line 1) | |
| 1095 | (< (point) endmark))) | |
| 1096 | (if (not delete-flag) | |
| 1097 | (c-append-backslash column) | |
| 1098 | (c-delete-backslash)) | |
| 1099 | (forward-line 1)) | |
| 1100 | (move-marker endmark nil)))) | |
| 1101 | ||
| 1102 | (defun c-append-backslash (column) | |
| 1103 | (end-of-line) | |
| 1104 | ;; Note that "\\\\" is needed to get one backslash. | |
| 1105 | (if (= (preceding-char) ?\\) | |
| 1106 | (progn (forward-char -1) | |
| 1107 | (delete-horizontal-space) | |
| 1108 | (indent-to column)) | |
| 1109 | (indent-to column) | |
| 1110 | (insert "\\"))) | |
| 1111 | ||
| 1112 | (defun c-delete-backslash () | |
| 1113 | (end-of-line) | |
| 1114 | (forward-char -1) | |
| 1115 | (if (looking-at "\\\\") | |
| 1116 | (delete-region (1+ (point)) | |
| 1117 | (progn (skip-chars-backward " \t") (point))))) | |
| c0274f38 ER |
1118 | |
| 1119 | ;;; c-mode.el ends here |