HCoop / bpt / emacs.git / blame
| Commit | Line | Data |
|---|---|---|
| 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: |
| a17915dc ER |
33 | |
| 34 | (defvar c-mode-abbrev-table nil | |
| 35 | "Abbrev table in use in C mode.") | |
| 36 | (define-abbrev-table 'c-mode-abbrev-table ()) | |
| 37 | ||
| 885020c5 | 38 | (defvar c-mode-map (make-sparse-keymap) |
| a17915dc | 39 | "Keymap used in C mode.") |
| 885020c5 RS |
40 | |
| 41 | (define-key c-mode-map "{" 'electric-c-brace) | |
| 42 | (define-key c-mode-map "}" 'electric-c-brace) | |
| 43 | (define-key c-mode-map ";" 'electric-c-semi) | |
| 44 | (define-key c-mode-map "#" 'electric-c-sharp-sign) | |
| 45 | (define-key c-mode-map ":" 'electric-c-terminator) | |
| 46 | (define-key c-mode-map "\e\C-h" 'mark-c-function) | |
| 47 | (define-key c-mode-map "\e\C-q" 'indent-c-exp) | |
| 48 | (define-key c-mode-map "\ea" 'c-beginning-of-statement) | |
| 49 | (define-key c-mode-map "\ee" 'c-end-of-statement) | |
| 885020c5 RS |
50 | (define-key c-mode-map "\C-c\C-n" 'c-forward-conditional) |
| 51 | (define-key c-mode-map "\C-c\C-p" 'c-backward-conditional) | |
| 52 | (define-key c-mode-map "\C-c\C-u" 'c-up-conditional) | |
| 53 | (define-key c-mode-map "\177" 'backward-delete-char-untabify) | |
| 9a474b25 | 54 | (define-key c-mode-map "\t" 'c-indent-command) |
| 885020c5 RS |
55 | |
| 56 | (define-key c-mode-map [menu-bar] (make-sparse-keymap)) | |
| 57 | ||
| c5c170d0 RS |
58 | ;; "C-mode" is not strictly the right punctuation--it should be "C |
| 59 | ;; mode"--but that would look like two menu items. "C-mode" is the | |
| 60 | ;; best alternative I can think of. | |
| 885020c5 | 61 | (define-key c-mode-map [menu-bar c] |
| c5c170d0 | 62 | (cons "C-mode" (make-sparse-keymap "C-mode"))) |
| 885020c5 | 63 | |
| 1a2ac388 RS |
64 | (define-key c-mode-map [menu-bar c comment-region] |
| 65 | '("Comment Out Region" . comment-region)) | |
| 66 | (define-key c-mode-map [menu-bar c c-macro-expand] | |
| 67 | '("Macro Expand Region" . c-macro-expand)) | |
| 68 | (define-key c-mode-map [menu-bar c c-backslash-region] | |
| 69 | '("Backslashify" . c-backslash-region)) | |
| 885020c5 RS |
70 | (define-key c-mode-map [menu-bar c indent-exp] |
| 71 | '("Indent Expression" . indent-c-exp)) | |
| 72 | (define-key c-mode-map [menu-bar c indent-line] | |
| 73 | '("Indent Line" . c-indent-command)) | |
| 74 | (define-key c-mode-map [menu-bar c fill] | |
| 75 | '("Fill Comment Paragraph" . c-fill-paragraph)) | |
| c814718b RS |
76 | (define-key c-mode-map [menu-bar c cpp-highlight-buffer] |
| 77 | '("Highlight Conditionals" . cpp-highlight-buffer)) | |
| 885020c5 RS |
78 | (define-key c-mode-map [menu-bar c up] |
| 79 | '("Up Conditional" . c-up-conditional)) | |
| 80 | (define-key c-mode-map [menu-bar c backward] | |
| 81 | '("Backward Conditional" . c-backward-conditional)) | |
| 82 | (define-key c-mode-map [menu-bar c forward] | |
| 83 | '("Forward Conditional" . c-forward-conditional)) | |
| 84 | (define-key c-mode-map [menu-bar c backward-stmt] | |
| 85 | '("Backward Statement" . c-beginning-of-statement)) | |
| 86 | (define-key c-mode-map [menu-bar c forward-stmt] | |
| 87 | '("Forward Statement" . c-end-of-statement)) | |
| a17915dc | 88 | |
| d73ecf45 SM |
89 | (put 'comment-region 'menu-enable 'mark-active) |
| 90 | (put 'c-macro-expand 'menu-enable 'mark-active) | |
| c6b3c155 | 91 | (put 'c-backslash-region 'menu-enable 'mark-active) |
| d73ecf45 | 92 | |
| a17915dc ER |
93 | (autoload 'c-macro-expand "cmacexp" |
| 94 | "Display the result of expanding all C macros occurring in the region. | |
| 95 | The expansion is entirely correct because it uses the C preprocessor." | |
| 96 | t) | |
| 97 | ||
| 98 | (defvar c-mode-syntax-table nil | |
| 99 | "Syntax table in use in C-mode buffers.") | |
| 100 | ||
| 101 | (if c-mode-syntax-table | |
| 102 | () | |
| 103 | (setq c-mode-syntax-table (make-syntax-table)) | |
| 104 | (modify-syntax-entry ?\\ "\\" c-mode-syntax-table) | |
| 105 | (modify-syntax-entry ?/ ". 14" c-mode-syntax-table) | |
| 106 | (modify-syntax-entry ?* ". 23" c-mode-syntax-table) | |
| 107 | (modify-syntax-entry ?+ "." c-mode-syntax-table) | |
| 108 | (modify-syntax-entry ?- "." c-mode-syntax-table) | |
| 109 | (modify-syntax-entry ?= "." c-mode-syntax-table) | |
| 110 | (modify-syntax-entry ?% "." c-mode-syntax-table) | |
| 111 | (modify-syntax-entry ?< "." c-mode-syntax-table) | |
| 112 | (modify-syntax-entry ?> "." 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 | ||
| 117 | (defconst c-indent-level 2 | |
| 118 | "*Indentation of C statements with respect to containing block.") | |
| 119 | (defconst c-brace-imaginary-offset 0 | |
| 120 | "*Imagined indentation of a C open brace that actually follows a statement.") | |
| 121 | (defconst c-brace-offset 0 | |
| 122 | "*Extra indentation for braces, compared with other text in same context.") | |
| 123 | (defconst c-argdecl-indent 5 | |
| 124 | "*Indentation level of declarations of C function arguments.") | |
| 125 | (defconst c-label-offset -2 | |
| 126 | "*Offset of C label lines and case statements relative to usual indentation.") | |
| 127 | (defconst c-continued-statement-offset 2 | |
| 128 | "*Extra indent for lines not starting new statements.") | |
| 129 | (defconst c-continued-brace-offset 0 | |
| 130 | "*Extra indent for substatements that start with open-braces. | |
| e7e7be7c | 131 | This is in addition to `c-continued-statement-offset'.") |
| a17915dc ER |
132 | (defconst c-style-alist |
| 133 | '(("GNU" | |
| 134 | (c-indent-level . 2) | |
| 135 | (c-argdecl-indent . 5) | |
| 136 | (c-brace-offset . 0) | |
| 02da8c82 | 137 | (c-continued-brace-offset . 0) |
| a17915dc ER |
138 | (c-label-offset . -2) |
| 139 | (c-continued-statement-offset . 2)) | |
| 140 | ("K&R" | |
| 141 | (c-indent-level . 5) | |
| 142 | (c-argdecl-indent . 0) | |
| 02da8c82 KH |
143 | (c-brace-offset . 0) |
| 144 | (c-continued-brace-offset . -5) | |
| a17915dc ER |
145 | (c-label-offset . -5) |
| 146 | (c-continued-statement-offset . 5)) | |
| 147 | ("BSD" | |
| 148 | (c-indent-level . 4) | |
| 149 | (c-argdecl-indent . 4) | |
| 02da8c82 | 150 | (c-brace-offset . 0) |
| e7e7be7c | 151 | (c-continued-brace-offset . -4) |
| a17915dc ER |
152 | (c-label-offset . -4) |
| 153 | (c-continued-statement-offset . 4)) | |
| ce4b7b02 | 154 | ("C++" |
| 02da8c82 KH |
155 | (c-indent-level . 4) |
| 156 | (c-argdecl-indent . 0) | |
| 157 | (c-brace-offset . 0) | |
| 158 | (c-continued-brace-offset . -4) | |
| 2b529dd2 | 159 | (c-label-offset . -4) |
| 02da8c82 KH |
160 | (c-continued-statement-offset . 4) |
| 161 | (c-auto-newline . t)) | |
| a17915dc ER |
162 | ("Whitesmith" |
| 163 | (c-indent-level . 4) | |
| 164 | (c-argdecl-indent . 4) | |
| 165 | (c-brace-offset . 0) | |
| 02da8c82 | 166 | (c-continued-brace-offset . 0) |
| a17915dc ER |
167 | (c-label-offset . -4) |
| 168 | (c-continued-statement-offset . 4)))) | |
| 169 | ||
| 170 | (defconst c-auto-newline nil | |
| 171 | "*Non-nil means automatically newline before and after braces, | |
| 172 | and after colons and semicolons, inserted in C code. | |
| 173 | If you do not want a leading newline before braces then use: | |
| 5852d145 | 174 | (define-key c-mode-map \"{\" 'electric-c-semi)") |
| a17915dc ER |
175 | |
| 176 | (defconst c-tab-always-indent t | |
| 177 | "*Non-nil means TAB in C mode should always reindent the current line, | |
| 178 | regardless of where in the line point is when the TAB command is used.") | |
| 3a65941e JB |
179 | |
| 180 | ;;; Regular expression used internally to recognize labels in switch | |
| 181 | ;;; statements. | |
| 0ce62eb2 | 182 | (defconst c-switch-label-regexp "case[ \t'/(]\\|default[ \t]*:") |
| 3a65941e | 183 | |
| 82af06af KH |
184 | ;; This is actually the expression for C++ mode, but it's used for C too. |
| 185 | (defvar c-imenu-generic-expression | |
| 186 | (` | |
| 187 | ((nil | |
| 188 | (, | |
| 189 | (concat | |
| 190 | "^" ; beginning of line is required | |
| 191 | "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" | |
| 192 | "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no | |
| 193 | "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right? | |
| 194 | ||
| 195 | "\\(" ; last type spec including */& | |
| 196 | "[a-zA-Z0-9_:]+" | |
| 197 | "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace | |
| 198 | "\\)?" ; if there is a last type spec | |
| 199 | "\\(" ; name; take that into the imenu entry | |
| 200 | "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor... | |
| 201 | ; (may not contain * because then | |
| 202 | ; "a::operator char*" would become "char*"!) | |
| 203 | "\\|" | |
| 204 | "\\([a-zA-Z0-9_:~]*::\\)?operator" | |
| 205 | "[^a-zA-Z1-9_][^(]*" ; ...or operator | |
| 206 | " \\)" | |
| 207 | "[ \t]*([^)]*)[ \t\n]*[^ ;]" ; require something other than a ; after | |
| 208 | ; the (...) to avoid prototypes. Can't | |
| 209 | ; catch cases with () inside the parentheses | |
| 210 | ; surrounding the parameters | |
| 211 | ; (like "int foo(int a=bar()) {...}" | |
| 212 | ||
| 213 | )) 6) | |
| 214 | ("Class" | |
| 215 | (, (concat | |
| 216 | "^" ; beginning of line is required | |
| 217 | "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" | |
| 218 | "class[ \t]+" | |
| 219 | "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get | |
| 220 | "[ \t]*[:{]" | |
| 221 | )) 2) | |
| 222 | ;; Example of generic expression for finding prototypes, structs, unions, enums. | |
| 223 | ;; Uncomment if you want to find these too. It will be a bit slower gathering | |
| 224 | ;; the indexes. | |
| 225 | ; ("Prototypes" | |
| 226 | ; (, | |
| 227 | ; (concat | |
| 228 | ; "^" ; beginning of line is required | |
| 229 | ; "\\(template[ \t]*<[^>]+>[ \t]*\\)?" ; there may be a "template <...>" | |
| 230 | ; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; type specs; there can be no | |
| 231 | ; "\\([a-zA-Z0-9_:]+[ \t]+\\)?" ; more than 3 tokens, right? | |
| 232 | ||
| 233 | ; "\\(" ; last type spec including */& | |
| 234 | ; "[a-zA-Z0-9_:]+" | |
| 235 | ; "\\([ \t]*[*&]+[ \t]*\\|[ \t]+\\)" ; either pointer/ref sign or whitespace | |
| 236 | ; "\\)?" ; if there is a last type spec | |
| 237 | ; "\\(" ; name; take that into the imenu entry | |
| 238 | ; "[a-zA-Z0-9_:~]+" ; member function, ctor or dtor... | |
| 239 | ; ; (may not contain * because then | |
| 240 | ; ; "a::operator char*" would become "char*"!) | |
| 241 | ; "\\|" | |
| 242 | ; "\\([a-zA-Z0-9_:~]*::\\)?operator" | |
| 243 | ; "[^a-zA-Z1-9_][^(]*" ; ...or operator | |
| 244 | ; " \\)" | |
| 245 | ; "[ \t]*([^)]*)[ \t\n]*;" ; require ';' after | |
| 246 | ; ; the (...) Can't | |
| 247 | ; ; catch cases with () inside the parentheses | |
| 248 | ; ; surrounding the parameters | |
| 249 | ; ; (like "int foo(int a=bar());" | |
| 250 | ; )) 6) | |
| 251 | ; ("Struct" | |
| 252 | ; (, (concat | |
| 253 | ; "^" ; beginning of line is required | |
| 254 | ; "\\(static[ \t]+\\)?" ; there may be static or const. | |
| 255 | ; "\\(const[ \t]+\\)?" | |
| 256 | ; "struct[ \t]+" | |
| 257 | ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get | |
| 258 | ; "[ \t]*[{]" | |
| 259 | ; )) 3) | |
| 260 | ; ("Enum" | |
| 261 | ; (, (concat | |
| 262 | ; "^" ; beginning of line is required | |
| 263 | ; "\\(static[ \t]+\\)?" ; there may be static or const. | |
| 264 | ; "\\(const[ \t]+\\)?" | |
| 265 | ; "enum[ \t]+" | |
| 266 | ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get | |
| 267 | ; "[ \t]*[{]" | |
| 268 | ; )) 3) | |
| 269 | ; ("Union" | |
| 270 | ; (, (concat | |
| 271 | ; "^" ; beginning of line is required | |
| 272 | ; "\\(static[ \t]+\\)?" ; there may be static or const. | |
| 273 | ; "\\(const[ \t]+\\)?" | |
| 274 | ; "union[ \t]+" | |
| 275 | ; "\\([a-zA-Z0-9_]+\\)" ; this is the string we want to get | |
| 276 | ; "[ \t]*[{]" | |
| 277 | ; )) 3) | |
| 278 | )) | |
| 279 | "Imenu generic expression for C mode. See `imenu-generic-expression'.") | |
| a17915dc | 280 | \f |
| a17915dc ER |
281 | (defun c-mode () |
| 282 | "Major mode for editing C code. | |
| 283 | Expression and list commands understand all C brackets. | |
| 284 | Tab indents for C code. | |
| 285 | Comments are delimited with /* ... */. | |
| 286 | Paragraphs are separated by blank lines only. | |
| 287 | Delete converts tabs to spaces as it moves back. | |
| 288 | \\{c-mode-map} | |
| 289 | Variables controlling indentation style: | |
| 290 | c-tab-always-indent | |
| 291 | Non-nil means TAB in C mode should always reindent the current line, | |
| 292 | regardless of where in the line point is when the TAB command is used. | |
| 293 | c-auto-newline | |
| 294 | Non-nil means automatically newline before and after braces, | |
| 295 | and after colons and semicolons, inserted in C code. | |
| 296 | c-indent-level | |
| 297 | Indentation of C statements within surrounding block. | |
| 298 | The surrounding block's indentation is the indentation | |
| 299 | of the line on which the open-brace appears. | |
| 300 | c-continued-statement-offset | |
| 301 | Extra indentation given to a substatement, such as the | |
| 302 | then-clause of an if or body of a while. | |
| 303 | c-continued-brace-offset | |
| 304 | Extra indentation given to a brace that starts a substatement. | |
| 305 | This is in addition to c-continued-statement-offset. | |
| 306 | c-brace-offset | |
| 307 | Extra indentation for line if it starts with an open brace. | |
| 308 | c-brace-imaginary-offset | |
| 309 | An open brace following other text is treated as if it were | |
| 310 | this far to the right of the start of its line. | |
| 311 | c-argdecl-indent | |
| 312 | Indentation level of declarations of C function arguments. | |
| 313 | c-label-offset | |
| 314 | Extra indentation for line that is a label, or case or default. | |
| 315 | ||
| 316 | Settings for K&R and BSD indentation styles are | |
| 317 | c-indent-level 5 8 | |
| 318 | c-continued-statement-offset 5 8 | |
| 319 | c-brace-offset -5 -8 | |
| 320 | c-argdecl-indent 0 8 | |
| 321 | c-label-offset -5 -8 | |
| 322 | ||
| 323 | Turning on C mode calls the value of the variable c-mode-hook with no args, | |
| 324 | if that value is non-nil." | |
| 325 | (interactive) | |
| 326 | (kill-all-local-variables) | |
| 327 | (use-local-map c-mode-map) | |
| 328 | (setq major-mode 'c-mode) | |
| 329 | (setq mode-name "C") | |
| 330 | (setq local-abbrev-table c-mode-abbrev-table) | |
| 331 | (set-syntax-table c-mode-syntax-table) | |
| 332 | (make-local-variable 'paragraph-start) | |
| 52af0e47 | 333 | (setq paragraph-start (concat "$\\|" page-delimiter)) |
| a17915dc ER |
334 | (make-local-variable 'paragraph-separate) |
| 335 | (setq paragraph-separate paragraph-start) | |
| 336 | (make-local-variable 'paragraph-ignore-fill-prefix) | |
| 337 | (setq paragraph-ignore-fill-prefix t) | |
| fcf9745f RS |
338 | (make-local-variable 'fill-paragraph-function) |
| 339 | (setq fill-paragraph-function 'c-fill-paragraph) | |
| a17915dc ER |
340 | (make-local-variable 'indent-line-function) |
| 341 | (setq indent-line-function 'c-indent-line) | |
| 342 | (make-local-variable 'indent-region-function) | |
| 343 | (setq indent-region-function 'c-indent-region) | |
| 344 | (make-local-variable 'require-final-newline) | |
| 345 | (setq require-final-newline t) | |
| bd133320 RS |
346 | (make-local-variable 'outline-regexp) |
| 347 | (setq outline-regexp "[^#\n\^M]") | |
| 348 | (make-local-variable 'outline-level) | |
| 349 | (setq outline-level 'c-outline-level) | |
| a17915dc ER |
350 | (make-local-variable 'comment-start) |
| 351 | (setq comment-start "/* ") | |
| 352 | (make-local-variable 'comment-end) | |
| 353 | (setq comment-end " */") | |
| 354 | (make-local-variable 'comment-column) | |
| 355 | (setq comment-column 32) | |
| 356 | (make-local-variable 'comment-start-skip) | |
| 357 | (setq comment-start-skip "/\\*+ *") | |
| e41b2db1 ER |
358 | (make-local-variable 'comment-indent-function) |
| 359 | (setq comment-indent-function 'c-comment-indent) | |
| 752e8dd9 RS |
360 | (make-local-variable 'comment-multi-line) |
| 361 | (setq comment-multi-line t) | |
| a17915dc ER |
362 | (make-local-variable 'parse-sexp-ignore-comments) |
| 363 | (setq parse-sexp-ignore-comments t) | |
| 82af06af KH |
364 | (make-local-variable 'imenu-generic-expression) |
| 365 | (setq imenu-generic-expression c-imenu-generic-expression) | |
| a17915dc | 366 | (run-hooks 'c-mode-hook)) |
| bd133320 RS |
367 | |
| 368 | (defun c-outline-level () | |
| 369 | (save-excursion | |
| 370 | (skip-chars-forward "\t ") | |
| 371 | (current-column))) | |
| a17915dc ER |
372 | \f |
| 373 | ;; This is used by indent-for-comment | |
| 374 | ;; to decide how much to indent a comment in C code | |
| 375 | ;; based on its context. | |
| 376 | (defun c-comment-indent () | |
| 377 | (if (looking-at "^/\\*") | |
| 378 | 0 ;Existing comment at bol stays there. | |
| 379 | (let ((opoint (point))) | |
| 380 | (save-excursion | |
| 381 | (beginning-of-line) | |
| 382 | (cond ((looking-at "[ \t]*}[ \t]*\\($\\|/\\*\\)") | |
| 383 | ;; A comment following a solitary close-brace | |
| 384 | ;; should have only one space. | |
| 385 | (search-forward "}") | |
| 386 | (1+ (current-column))) | |
| 387 | ((or (looking-at "^#[ \t]*endif[ \t]*") | |
| 388 | (looking-at "^#[ \t]*else[ \t]*")) | |
| 389 | 7) ;2 spaces after #endif | |
| 390 | ((progn | |
| 391 | (goto-char opoint) | |
| 392 | (skip-chars-backward " \t") | |
| 393 | (and (= comment-column 0) (bolp))) | |
| 394 | ;; If comment-column is 0, and nothing but space | |
| 395 | ;; before the comment, align it at 0 rather than 1. | |
| 396 | 0) | |
| 397 | (t | |
| 398 | (max (1+ (current-column)) ;Else indent at comment column | |
| 399 | comment-column))))))) ; except leave at least one space. | |
| 400 | ||
| 401 | (defun c-fill-paragraph (&optional arg) | |
| 402 | "Like \\[fill-paragraph] but handle C comments. | |
| c9c56492 RS |
403 | If any of the current line is a comment or within a comment, |
| 404 | fill the comment or the paragraph of it that point is in, | |
| 405 | preserving the comment indentation or line-starting decorations." | |
| a17915dc | 406 | (interactive "P") |
| 6cf42072 RS |
407 | (let* (comment-start-place |
| 408 | (first-line | |
| 409 | ;; Check for obvious entry to comment. | |
| 410 | (save-excursion | |
| 411 | (beginning-of-line) | |
| 8931ecc0 | 412 | (skip-chars-forward " \t\n") |
| 6cf42072 RS |
413 | (and (looking-at comment-start-skip) |
| 414 | (setq comment-start-place (point)))))) | |
| 0fef40c0 RS |
415 | (if (and (eq major-mode 'c++-mode) |
| 416 | (save-excursion | |
| 417 | (beginning-of-line) | |
| 418 | (looking-at ".*//"))) | |
| 419 | (let (fill-prefix | |
| a17915dc ER |
420 | (paragraph-start |
| 421 | ;; Lines containing just a comment start or just an end | |
| 422 | ;; should not be filled into paragraphs they are next to. | |
| dbc4e1c1 JB |
423 | (concat |
| 424 | paragraph-start | |
| 52af0e47 | 425 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
| a17915dc | 426 | (paragraph-separate |
| dbc4e1c1 JB |
427 | (concat |
| 428 | paragraph-separate | |
| 52af0e47 | 429 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$"))) |
| 0fef40c0 RS |
430 | (save-excursion |
| 431 | (beginning-of-line) | |
| 432 | ;; Move up to first line of this comment. | |
| 433 | (while (and (not (bobp)) (looking-at "[ \t]*//")) | |
| 434 | (forward-line -1)) | |
| 435 | (if (not (looking-at ".*//")) | |
| 436 | (forward-line 1)) | |
| 437 | ;; Find the comment start in this line. | |
| 438 | (re-search-forward "[ \t]*//[ \t]*") | |
| 439 | ;; Set the fill-prefix to be what all lines except the first | |
| 440 | ;; should start with. | |
| 441 | (let ((endcol (current-column))) | |
| 442 | (skip-chars-backward " \t") | |
| 443 | (setq fill-prefix | |
| 444 | (concat (make-string (- (current-column) 2) ?\ ) | |
| 445 | "//" | |
| 446 | (make-string (- endcol (current-column)) ?\ )))) | |
| 447 | (save-restriction | |
| 448 | ;; Narrow down to just the lines of this comment. | |
| 449 | (narrow-to-region (point) | |
| 450 | (save-excursion | |
| 451 | (forward-line 1) | |
| c9a73a9b | 452 | (while (looking-at "[ \t]*//") |
| 0fef40c0 RS |
453 | (forward-line 1)) |
| 454 | (point))) | |
| 455 | (insert fill-prefix) | |
| 456 | (fill-paragraph arg) | |
| 457 | (delete-region (point-min) | |
| 458 | (+ (point-min) (length fill-prefix)))))) | |
| 459 | (if (or first-line | |
| 460 | ;; t if we enter a comment between start of function and this line. | |
| 461 | (eq (calculate-c-indent) t) | |
| 462 | ;; t if this line contains a comment starter. | |
| 463 | (setq first-line | |
| 464 | (save-excursion | |
| 465 | (beginning-of-line) | |
| 466 | (prog1 | |
| 467 | (re-search-forward comment-start-skip | |
| 468 | (save-excursion (end-of-line) | |
| 469 | (point)) | |
| 470 | t) | |
| 471 | (setq comment-start-place (point)))))) | |
| 472 | ;; Inside a comment: fill one comment paragraph. | |
| 473 | (let ((fill-prefix | |
| 474 | ;; The prefix for each line of this paragraph | |
| 475 | ;; is the appropriate part of the start of this line, | |
| 476 | ;; up to the column at which text should be indented. | |
| 477 | (save-excursion | |
| 478 | (beginning-of-line) | |
| 479 | (if (looking-at "[ \t]*/\\*.*\\*/") | |
| 480 | (progn (re-search-forward comment-start-skip) | |
| 481 | (make-string (current-column) ?\ )) | |
| 482 | (if first-line (forward-line 1)) | |
| 483 | ||
| 484 | (let ((line-width (progn (end-of-line) (current-column)))) | |
| 485 | (beginning-of-line) | |
| 486 | (prog1 | |
| 487 | (buffer-substring | |
| 488 | (point) | |
| 489 | ||
| 490 | ;; How shall we decide where the end of the | |
| 491 | ;; fill-prefix is? | |
| 492 | ;; calculate-c-indent-within-comment bases its value | |
| 493 | ;; on the indentation of previous lines; if they're | |
| 494 | ;; indented specially, it could return a column | |
| 495 | ;; that's well into the current line's text. So | |
| 496 | ;; we'll take at most that many space, tab, or * | |
| 497 | ;; characters, and use that as our fill prefix. | |
| 498 | (let ((max-prefix-end | |
| 499 | (progn | |
| 500 | (move-to-column | |
| 501 | (calculate-c-indent-within-comment t) | |
| 502 | t) | |
| 503 | (point)))) | |
| 504 | (beginning-of-line) | |
| 505 | (skip-chars-forward " \t*" max-prefix-end) | |
| 84f4e216 RS |
506 | ;; Don't include part of comment terminator |
| 507 | ;; in the fill-prefix. | |
| 508 | (and (eq (following-char) ?/) | |
| 509 | (eq (preceding-char) ?*) | |
| 510 | (backward-char 1)) | |
| 0fef40c0 RS |
511 | (point))) |
| 512 | ||
| 513 | ;; If the comment is only one line followed by a blank | |
| 514 | ;; line, calling move-to-column above may have added | |
| 515 | ;; some spaces and tabs to the end of the line; the | |
| 516 | ;; fill-paragraph function will then delete it and the | |
| 517 | ;; newline following it, so we'll lose a blank line | |
| 518 | ;; when we shouldn't. So delete anything | |
| 519 | ;; move-to-column added to the end of the line. We | |
| 520 | ;; record the line width instead of the position of the | |
| 521 | ;; old line end because move-to-column might break a | |
| 522 | ;; tab into spaces, and the new characters introduced | |
| 523 | ;; there shouldn't be deleted. | |
| 524 | ||
| 525 | ;; If you can see a better way to do this, please make | |
| 526 | ;; the change. This seems very messy to me. | |
| 527 | (delete-region (progn (move-to-column line-width) | |
| 528 | (point)) | |
| 529 | (progn (end-of-line) (point)))))))) | |
| 530 | ||
| 531 | (paragraph-start | |
| 532 | ;; Lines containing just a comment start or just an end | |
| 533 | ;; should not be filled into paragraphs they are next to. | |
| 534 | (concat | |
| 535 | paragraph-start | |
| 52af0e47 | 536 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
| 0fef40c0 RS |
537 | (paragraph-separate |
| 538 | (concat | |
| 539 | paragraph-separate | |
| 52af0e47 | 540 | "\\|[ \t]*/\\*[ \t]*$\\|[ \t]*\\*/[ \t]*$\\|[ \t/*]*$")) |
| 0fef40c0 RS |
541 | (chars-to-delete 0)) |
| 542 | (save-restriction | |
| 543 | ;; Don't fill the comment together with the code following it. | |
| 544 | ;; So temporarily exclude everything before the comment start, | |
| 545 | ;; and everything after the line where the comment ends. | |
| 546 | ;; If comment-start-place is non-nil, the comment starter is there. | |
| 547 | ;; Otherwise, point is inside the comment. | |
| 548 | (narrow-to-region (save-excursion | |
| 549 | (if comment-start-place | |
| 550 | (goto-char comment-start-place) | |
| 551 | (search-backward "/*")) | |
| 552 | ;; Protect text before the comment start | |
| 553 | ;; by excluding it. Add spaces to bring back | |
| 554 | ;; proper indentation of that point. | |
| 555 | (let ((column (current-column))) | |
| 556 | (prog1 (point) | |
| 557 | (setq chars-to-delete column) | |
| 558 | (insert-char ?\ column)))) | |
| 559 | (save-excursion | |
| 560 | (if comment-start-place | |
| 561 | (goto-char (+ comment-start-place 2))) | |
| 562 | (search-forward "*/" nil 'move) | |
| 563 | (forward-line 1) | |
| 564 | (point))) | |
| 58ac467e KH |
565 | (save-excursion |
| 566 | (goto-char (point-max)) | |
| 567 | (forward-line -1) | |
| 568 | ;; And comment terminator was on a separate line before, | |
| 569 | ;; keep it that way. | |
| 570 | ;; This also avoids another problem: | |
| 571 | ;; if the fill-prefix ends in a *, it could eat up | |
| 572 | ;; the * of the comment terminator. | |
| 573 | (if (looking-at "[ \t]*\\*/") | |
| 574 | (narrow-to-region (point-min) (point)))) | |
| 0fef40c0 RS |
575 | (fill-paragraph arg) |
| 576 | (save-excursion | |
| 577 | ;; Delete the chars we inserted to avoid clobbering | |
| 578 | ;; the stuff before the comment start. | |
| 579 | (goto-char (point-min)) | |
| 580 | (if (> chars-to-delete 0) | |
| 581 | (delete-region (point) (+ (point) chars-to-delete))) | |
| 582 | ;; Find the comment ender (should be on last line of buffer, | |
| 583 | ;; given the narrowing) and don't leave it on its own line. | |
| 176afd04 KH |
584 | ;; Do this with a fill command, so as to preserve sentence |
| 585 | ;; boundaries. | |
| 0fef40c0 RS |
586 | (goto-char (point-max)) |
| 587 | (forward-line -1) | |
| 588 | (search-forward "*/" nil 'move) | |
| 589 | (beginning-of-line) | |
| 590 | (if (looking-at "[ \t]*\\*/") | |
| 176afd04 KH |
591 | (let ((fill-column (+ fill-column 9999))) |
| 592 | (forward-line -1) | |
| 593 | (fill-region-as-paragraph (point) (point-max))))))) | |
| 0fef40c0 | 594 | ;; Outside of comments: do ordinary filling. |
| fcf9745f RS |
595 | (fill-paragraph arg))) |
| 596 | t)) | |
| a17915dc ER |
597 | |
| 598 | (defun electric-c-brace (arg) | |
| 599 | "Insert character and correct line's indentation." | |
| 600 | (interactive "P") | |
| 601 | (let (insertpos) | |
| 602 | (if (and (not arg) | |
| 603 | (eolp) | |
| 604 | (or (save-excursion | |
| 605 | (skip-chars-backward " \t") | |
| 606 | (bolp)) | |
| 607 | (if c-auto-newline (progn (c-indent-line) (newline) t) nil))) | |
| 608 | (progn | |
| 609 | (insert last-command-char) | |
| 610 | (c-indent-line) | |
| 611 | (if c-auto-newline | |
| 612 | (progn | |
| 613 | (newline) | |
| 614 | ;; (newline) may have done auto-fill | |
| 615 | (setq insertpos (- (point) 2)) | |
| 616 | (c-indent-line))) | |
| 617 | (save-excursion | |
| 618 | (if insertpos (goto-char (1+ insertpos))) | |
| 619 | (delete-char -1)))) | |
| 620 | (if insertpos | |
| 621 | (save-excursion | |
| 622 | (goto-char insertpos) | |
| 623 | (self-insert-command (prefix-numeric-value arg))) | |
| 624 | (self-insert-command (prefix-numeric-value arg))))) | |
| 625 | ||
| 626 | (defun electric-c-sharp-sign (arg) | |
| 627 | "Insert character and correct line's indentation." | |
| 628 | (interactive "P") | |
| 629 | (if (save-excursion | |
| 630 | (skip-chars-backward " \t") | |
| 631 | (bolp)) | |
| 632 | (let ((c-auto-newline nil)) | |
| 633 | (electric-c-terminator arg)) | |
| 634 | (self-insert-command (prefix-numeric-value arg)))) | |
| 635 | ||
| 636 | (defun electric-c-semi (arg) | |
| 637 | "Insert character and correct line's indentation." | |
| 638 | (interactive "P") | |
| 639 | (if c-auto-newline | |
| 640 | (electric-c-terminator arg) | |
| 641 | (self-insert-command (prefix-numeric-value arg)))) | |
| 642 | ||
| 643 | (defun electric-c-terminator (arg) | |
| 644 | "Insert character and correct line's indentation." | |
| 645 | (interactive "P") | |
| 646 | (let (insertpos (end (point))) | |
| 647 | (if (and (not arg) (eolp) | |
| 648 | (not (save-excursion | |
| 649 | (beginning-of-line) | |
| 650 | (skip-chars-forward " \t") | |
| 651 | (or (= (following-char) ?#) | |
| 652 | ;; Colon is special only after a label, or case .... | |
| 653 | ;; So quickly rule out most other uses of colon | |
| 654 | ;; and do no indentation for them. | |
| 655 | (and (eq last-command-char ?:) | |
| 3a65941e | 656 | (not (looking-at c-switch-label-regexp)) |
| a17915dc ER |
657 | (save-excursion |
| 658 | (skip-chars-forward "a-zA-Z0-9_$") | |
| 659 | (skip-chars-forward " \t") | |
| 660 | (< (point) end))) | |
| 661 | (progn | |
| 662 | (beginning-of-defun) | |
| 663 | (let ((pps (parse-partial-sexp (point) end))) | |
| 664 | (or (nth 3 pps) (nth 4 pps) (nth 5 pps)))))))) | |
| 665 | (progn | |
| 666 | (insert last-command-char) | |
| 667 | (c-indent-line) | |
| 668 | (and c-auto-newline | |
| 669 | (not (c-inside-parens-p)) | |
| 670 | (progn | |
| 671 | (newline) | |
| 672 | ;; (newline) may have done auto-fill | |
| 673 | (setq insertpos (- (point) 2)) | |
| 674 | (c-indent-line))) | |
| 675 | (save-excursion | |
| 676 | (if insertpos (goto-char (1+ insertpos))) | |
| 677 | (delete-char -1)))) | |
| 678 | (if insertpos | |
| 679 | (save-excursion | |
| 680 | (goto-char insertpos) | |
| 681 | (self-insert-command (prefix-numeric-value arg))) | |
| 682 | (self-insert-command (prefix-numeric-value arg))))) | |
| 683 | ||
| 684 | (defun c-inside-parens-p () | |
| 685 | (condition-case () | |
| 686 | (save-excursion | |
| 687 | (save-restriction | |
| 688 | (narrow-to-region (point) | |
| 689 | (progn (beginning-of-defun) (point))) | |
| 690 | (goto-char (point-max)) | |
| 691 | (= (char-after (or (scan-lists (point) -1 1) (point-min))) ?\())) | |
| 692 | (error nil))) | |
| 693 | \f | |
| 694 | (defun c-indent-command (&optional whole-exp) | |
| 695 | "Indent current line as C code, or in some cases insert a tab character. | |
| 696 | If `c-tab-always-indent' is non-nil (the default), always indent current line. | |
| 697 | Otherwise, indent the current line only if point is at the left margin or | |
| 698 | in the line's indentation; otherwise insert a tab. | |
| 699 | ||
| 700 | A numeric argument, regardless of its value, means indent rigidly all the | |
| 701 | lines of the expression starting after point so that this line becomes | |
| 702 | properly indented. The relative indentation among the lines of the | |
| 703 | expression are preserved." | |
| 704 | (interactive "P") | |
| 705 | (if whole-exp | |
| 706 | ;; If arg, always indent this line as C | |
| 707 | ;; and shift remaining lines of expression the same amount. | |
| 708 | (let ((shift-amt (c-indent-line)) | |
| 709 | beg end) | |
| 710 | (save-excursion | |
| 711 | (if c-tab-always-indent | |
| 712 | (beginning-of-line)) | |
| 713 | ;; Find beginning of following line. | |
| 714 | (save-excursion | |
| 715 | (forward-line 1) (setq beg (point))) | |
| 716 | ;; Find first beginning-of-sexp for sexp extending past this line. | |
| 717 | (while (< (point) beg) | |
| 718 | (forward-sexp 1) | |
| 719 | (setq end (point)) | |
| 720 | (skip-chars-forward " \t\n"))) | |
| 721 | (if (> end beg) | |
| 722 | (indent-code-rigidly beg end shift-amt "#"))) | |
| 723 | (if (and (not c-tab-always-indent) | |
| 724 | (save-excursion | |
| 725 | (skip-chars-backward " \t") | |
| 726 | (not (bolp)))) | |
| 727 | (insert-tab) | |
| 728 | (c-indent-line)))) | |
| 729 | ||
| 730 | (defun c-indent-line () | |
| 731 | "Indent current line as C code. | |
| 732 | Return the amount the indentation changed by." | |
| 733 | (let ((indent (calculate-c-indent nil)) | |
| 734 | beg shift-amt | |
| 735 | (case-fold-search nil) | |
| 736 | (pos (- (point-max) (point)))) | |
| 737 | (beginning-of-line) | |
| 738 | (setq beg (point)) | |
| 739 | (cond ((eq indent nil) | |
| 740 | (setq indent (current-indentation))) | |
| 741 | ((eq indent t) | |
| 742 | (setq indent (calculate-c-indent-within-comment))) | |
| 743 | ((looking-at "[ \t]*#") | |
| 744 | (setq indent 0)) | |
| 745 | (t | |
| 746 | (skip-chars-forward " \t") | |
| 747 | (if (listp indent) (setq indent (car indent))) | |
| 3a65941e | 748 | (cond ((or (looking-at c-switch-label-regexp) |
| a17915dc ER |
749 | (and (looking-at "[A-Za-z]") |
| 750 | (save-excursion | |
| 751 | (forward-sexp 1) | |
| 752 | (looking-at ":")))) | |
| 753 | (setq indent (max 1 (+ indent c-label-offset)))) | |
| 754 | ((and (looking-at "else\\b") | |
| 755 | (not (looking-at "else\\s_"))) | |
| 756 | (setq indent (save-excursion | |
| 757 | (c-backward-to-start-of-if) | |
| 758 | (current-indentation)))) | |
| 401662cb RS |
759 | ((and (looking-at "}[ \t]*else\\b") |
| 760 | (not (looking-at "}[ \t]*else\\s_"))) | |
| a17915dc ER |
761 | (setq indent (save-excursion |
| 762 | (forward-char) | |
| 763 | (backward-sexp) | |
| eca5b04c | 764 | (c-backward-to-start-of-if) |
| a17915dc ER |
765 | (current-indentation)))) |
| 766 | ((and (looking-at "while\\b") | |
| 401662cb | 767 | (not (looking-at "while\\s_")) |
| a17915dc ER |
768 | (save-excursion |
| 769 | (c-backward-to-start-of-do))) | |
| 770 | ;; This is a `while' that ends a do-while. | |
| 771 | (setq indent (save-excursion | |
| 772 | (c-backward-to-start-of-do) | |
| 773 | (current-indentation)))) | |
| 774 | ((= (following-char) ?}) | |
| 775 | (setq indent (- indent c-indent-level))) | |
| 776 | ((= (following-char) ?{) | |
| 777 | (setq indent (+ indent c-brace-offset)))))) | |
| 778 | (skip-chars-forward " \t") | |
| 779 | (setq shift-amt (- indent (current-column))) | |
| 780 | (if (zerop shift-amt) | |
| 781 | (if (> (- (point-max) pos) (point)) | |
| 782 | (goto-char (- (point-max) pos))) | |
| 783 | (delete-region beg (point)) | |
| 784 | (indent-to indent) | |
| 785 | ;; If initial point was within line's indentation, | |
| 786 | ;; position after the indentation. Else stay at same point in text. | |
| 787 | (if (> (- (point-max) pos) (point)) | |
| 788 | (goto-char (- (point-max) pos)))) | |
| 789 | shift-amt)) | |
| 790 | ||
| 791 | (defun calculate-c-indent (&optional parse-start) | |
| 792 | "Return appropriate indentation for current line as C code. | |
| 793 | In usual case returns an integer: the column to indent to. | |
| 794 | Returns nil if line starts inside a string, t if in a comment." | |
| 795 | (save-excursion | |
| 796 | (beginning-of-line) | |
| 797 | (let ((indent-point (point)) | |
| 798 | (case-fold-search nil) | |
| 799 | state | |
| 800 | containing-sexp) | |
| 801 | (if parse-start | |
| 802 | (goto-char parse-start) | |
| 803 | (beginning-of-defun)) | |
| 804 | (while (< (point) indent-point) | |
| 805 | (setq parse-start (point)) | |
| 806 | (setq state (parse-partial-sexp (point) indent-point 0)) | |
| 807 | (setq containing-sexp (car (cdr state)))) | |
| 808 | (cond ((or (nth 3 state) (nth 4 state)) | |
| 809 | ;; return nil or t if should not change this line | |
| 810 | (nth 4 state)) | |
| 811 | ((null containing-sexp) | |
| 812 | ;; Line is at top level. May be data or function definition, | |
| 813 | ;; or may be function argument declaration. | |
| 814 | ;; Indent like the previous top level line | |
| 815 | ;; unless that ends in a closeparen without semicolon, | |
| 816 | ;; in which case this line is the first argument decl. | |
| 817 | (goto-char indent-point) | |
| 818 | (skip-chars-forward " \t") | |
| 819 | (if (= (following-char) ?{) | |
| 820 | 0 ; Unless it starts a function body | |
| 821 | (c-backward-to-noncomment (or parse-start (point-min))) | |
| 822 | ;; Look at previous line that's at column 0 | |
| 823 | ;; to determine whether we are in top-level decls | |
| 824 | ;; or function's arg decls. Set basic-indent accordingly. | |
| 825 | (let ((basic-indent | |
| 826 | (save-excursion | |
| 827 | (re-search-backward "^[^ \^L\t\n#]" nil 'move) | |
| c763f396 | 828 | (let (comment lim) |
| 6ec3899e RS |
829 | ;; Recognize the DEFUN macro in Emacs. |
| 830 | (if (save-excursion | |
| 831 | ;; Move down to the (putative) argnames line. | |
| 35a4d143 RS |
832 | (while (and (not (eobp)) |
| 833 | (not (looking-at " *[({}#/]"))) | |
| 6ec3899e RS |
834 | (forward-line 1)) |
| 835 | ;; Go back to the DEFUN, if it is one. | |
| 836 | (condition-case nil | |
| 837 | (backward-sexp 1) | |
| 838 | (error)) | |
| 839 | (beginning-of-line) | |
| 6ec3899e RS |
840 | (looking-at "DEFUN\\b")) |
| 841 | c-argdecl-indent | |
| 842 | (if (and (looking-at "\\sw\\|\\s_") | |
| 791cc57d RS |
843 | ;; This is careful to stop at the first |
| 844 | ;; paren if we have | |
| 845 | ;; int foo Proto ((int, int)); | |
| 846 | (looking-at "[^\"\n=(]*(") | |
| 6ec3899e RS |
847 | (progn |
| 848 | (goto-char (1- (match-end 0))) | |
| caeb79ef RS |
849 | ;; Skip any number of paren-groups. |
| 850 | ;; Consider typedef int (*fcn) (int); | |
| 851 | (while (= (following-char) ?\() | |
| 852 | (setq lim (point)) | |
| 853 | (condition-case nil | |
| 854 | (forward-sexp 1) | |
| 855 | (error)) | |
| 856 | (skip-chars-forward " \t\f")) | |
| 857 | ;; Have we reached something | |
| 858 | ;; that shows this isn't a function | |
| 859 | ;; definition? | |
| 6ec3899e RS |
860 | (and (< (point) indent-point) |
| 861 | (not (memq (following-char) | |
| 862 | '(?\, ?\;))))) | |
| 863 | ;; Make sure the "function decl" we found | |
| 864 | ;; is not inside a comment. | |
| 865 | (progn | |
| 95d19fad RS |
866 | ;; Move back to the `(' starting arglist |
| 867 | (goto-char lim) | |
| 6ec3899e RS |
868 | (beginning-of-line) |
| 869 | (while (and (not comment) | |
| 870 | (search-forward "/*" lim t)) | |
| 871 | (setq comment | |
| 872 | (not (search-forward "*/" lim t)))) | |
| 873 | (not comment))) | |
| 874 | c-argdecl-indent 0)))))) | |
| a17915dc ER |
875 | basic-indent))) |
| 876 | ||
| 877 | ;; ;; Now add a little if this is a continuation line. | |
| 878 | ;; (+ basic-indent (if (or (bobp) | |
| 879 | ;; (memq (preceding-char) '(?\) ?\; ?\})) | |
| 880 | ;; ;; Line with zero indentation | |
| 881 | ;; ;; is probably the return-type | |
| 882 | ;; ;; of a function definition, | |
| 883 | ;; ;; so following line is function name. | |
| 884 | ;; (= (current-indentation) 0)) | |
| 885 | ;; 0 c-continued-statement-offset)) | |
| 886 | ||
| 887 | ((/= (char-after containing-sexp) ?{) | |
| 888 | ;; line is expression, not statement: | |
| 889 | ;; indent to just after the surrounding open. | |
| 890 | (goto-char (1+ containing-sexp)) | |
| 891 | (current-column)) | |
| 892 | (t | |
| 893 | ;; Statement level. Is it a continuation or a new statement? | |
| 894 | ;; Find previous non-comment character. | |
| 895 | (goto-char indent-point) | |
| 896 | (c-backward-to-noncomment containing-sexp) | |
| 897 | ;; Back up over label lines, since they don't | |
| 898 | ;; affect whether our line is a continuation. | |
| 899 | (while (or (eq (preceding-char) ?\,) | |
| 900 | (and (eq (preceding-char) ?:) | |
| 901 | (or (eq (char-after (- (point) 2)) ?\') | |
| 902 | (memq (char-syntax (char-after (- (point) 2))) | |
| 903 | '(?w ?_))))) | |
| 904 | (if (eq (preceding-char) ?\,) | |
| 905 | (progn (forward-char -1) | |
| 906 | (c-backward-to-start-of-continued-exp containing-sexp))) | |
| 907 | (beginning-of-line) | |
| 908 | (c-backward-to-noncomment containing-sexp)) | |
| 909 | ;; Check for a preprocessor statement or its continuation lines. | |
| 5ef470be KH |
910 | ;; Move back to end of previous non-preprocessor line, |
| 911 | ;; or possibly beginning of buffer. | |
| a17915dc ER |
912 | (let ((found (point)) stop) |
| 913 | (while (not stop) | |
| 5ef470be KH |
914 | (beginning-of-line) |
| 915 | (cond ((bobp) | |
| 916 | (setq found (point) | |
| 917 | stop t)) | |
| 918 | ((save-excursion (forward-char -1) | |
| a17915dc | 919 | (= (preceding-char) ?\\)) |
| 5ef470be | 920 | (forward-char -1)) |
| a17915dc ER |
921 | ;; This line is not preceded by a backslash. |
| 922 | ;; So either it starts a preprocessor command | |
| 923 | ;; or any following continuation lines | |
| 924 | ;; should not be skipped. | |
| 5ef470be KH |
925 | ((= (following-char) ?#) |
| 926 | (forward-char -1) | |
| a17915dc ER |
927 | (setq found (point))) |
| 928 | (t (setq stop t)))) | |
| 929 | (goto-char found)) | |
| 930 | ;; Now we get the answer. | |
| 5ef470be | 931 | (if (and (not (memq (preceding-char) '(0 ?\, ?\; ?\} ?\{))) |
| a17915dc ER |
932 | ;; But don't treat a line with a close-brace |
| 933 | ;; as a continuation. It is probably the | |
| 934 | ;; end of an enum type declaration. | |
| 935 | (save-excursion | |
| 936 | (goto-char indent-point) | |
| 937 | (skip-chars-forward " \t") | |
| 938 | (not (= (following-char) ?})))) | |
| 939 | ;; This line is continuation of preceding line's statement; | |
| 940 | ;; indent c-continued-statement-offset more than the | |
| 941 | ;; previous line of the statement. | |
| 942 | (progn | |
| 943 | (c-backward-to-start-of-continued-exp containing-sexp) | |
| 944 | (+ c-continued-statement-offset (current-column) | |
| 945 | (if (save-excursion (goto-char indent-point) | |
| 946 | (skip-chars-forward " \t") | |
| 947 | (eq (following-char) ?{)) | |
| 948 | c-continued-brace-offset 0))) | |
| 949 | ;; This line starts a new statement. | |
| 950 | ;; Position following last unclosed open. | |
| 951 | (goto-char containing-sexp) | |
| 952 | ;; Is line first statement after an open-brace? | |
| 953 | (or | |
| 954 | ;; If no, find that first statement and indent like it. | |
| 955 | (save-excursion | |
| 956 | (forward-char 1) | |
| 957 | (let ((colon-line-end 0)) | |
| 958 | (while (progn (skip-chars-forward " \t\n") | |
| 959 | (looking-at "#\\|/\\*\\|case[ \t\n'/(].*:\\|[a-zA-Z0-9_$]*:")) | |
| 960 | ;; Skip over comments and labels following openbrace. | |
| 961 | (cond ((= (following-char) ?\#) | |
| 962 | (forward-line 1)) | |
| 963 | ((= (following-char) ?\/) | |
| 964 | (forward-char 2) | |
| 965 | (search-forward "*/" nil 'move)) | |
| 966 | ;; case or label: | |
| 967 | (t | |
| 968 | (save-excursion (end-of-line) | |
| 969 | (setq colon-line-end (point))) | |
| 970 | (search-forward ":")))) | |
| 971 | ;; The first following code counts | |
| 972 | ;; if it is before the line we want to indent. | |
| 973 | (and (< (point) indent-point) | |
| 1635fcdd RS |
974 | (- |
| 975 | (if (> colon-line-end (point)) | |
| 976 | (- (current-indentation) c-label-offset) | |
| 977 | (current-column)) | |
| 978 | ;; If prev stmt starts with open-brace, that | |
| 979 | ;; open brace was offset by c-brace-offset. | |
| 980 | ;; Compensate to get the column where | |
| 981 | ;; an ordinary statement would start. | |
| 982 | (if (= (following-char) ?\{) c-brace-offset 0))))) | |
| a17915dc ER |
983 | ;; If no previous statement, |
| 984 | ;; indent it relative to line brace is on. | |
| 3a8a46f1 RS |
985 | (calculate-c-indent-after-brace)))))))) |
| 986 | ||
| 987 | (defun calculate-c-indent-after-brace () | |
| 988 | "Return the proper C indent for the first line after an open-brace. | |
| 989 | This function is called with point before the brace." | |
| 990 | ;; For open brace in column zero, don't let statement | |
| 991 | ;; start there too. If c-indent-level is zero, | |
| 992 | ;; use c-brace-offset + c-continued-statement-offset instead. | |
| 993 | ;; For open-braces not the first thing in a line, | |
| 994 | ;; add in c-brace-imaginary-offset. | |
| 995 | (+ (if (and (bolp) (zerop c-indent-level)) | |
| 996 | (+ c-brace-offset c-continued-statement-offset) | |
| 997 | c-indent-level) | |
| 998 | ;; Move back over whitespace before the openbrace. | |
| 999 | ;; If openbrace is not first nonwhite thing on the line, | |
| 1000 | ;; add the c-brace-imaginary-offset. | |
| 1001 | (progn (skip-chars-backward " \t") | |
| 1002 | (if (bolp) 0 c-brace-imaginary-offset)) | |
| 1003 | ;; If the openbrace is preceded by a parenthesized exp, | |
| 1004 | ;; move to the beginning of that; | |
| 1005 | ;; possibly a different line | |
| 1006 | (progn | |
| 1007 | (if (eq (preceding-char) ?\)) | |
| 1008 | (forward-sexp -1)) | |
| 1009 | ;; Get initial indentation of the line we are on. | |
| 1010 | (current-indentation)))) | |
| a17915dc ER |
1011 | |
| 1012 | (defun calculate-c-indent-within-comment (&optional after-star) | |
| 1013 | "Return the indentation amount for line inside a block comment. | |
| 1014 | Optional arg AFTER-STAR means, if lines in the comment have a leading star, | |
| 1015 | return the indentation of the text that would follow this star." | |
| 1016 | (let (end star-start) | |
| 1017 | (save-excursion | |
| 1018 | (beginning-of-line) | |
| 1019 | (skip-chars-forward " \t") | |
| 1020 | (setq star-start (= (following-char) ?\*)) | |
| 1021 | (skip-chars-backward " \t\n") | |
| 1022 | (setq end (point)) | |
| 1023 | (beginning-of-line) | |
| 1024 | (skip-chars-forward " \t") | |
| 1025 | (if after-star | |
| 1026 | (and (looking-at "\\*") | |
| 1027 | (re-search-forward "\\*[ \t]*"))) | |
| 1028 | (and (re-search-forward "/\\*[ \t]*" end t) | |
| 1029 | star-start | |
| 1030 | (not after-star) | |
| 1031 | (goto-char (1+ (match-beginning 0)))) | |
| 1032 | (if (and (looking-at "[ \t]*$") (= (preceding-char) ?\*)) | |
| 1033 | (1+ (current-column)) | |
| 1034 | (current-column))))) | |
| 1035 | ||
| 1036 | ||
| 1037 | (defun c-backward-to-noncomment (lim) | |
| 1038 | (let (opoint stop) | |
| 1039 | (while (not stop) | |
| 1040 | (skip-chars-backward " \t\n\f" lim) | |
| 1041 | (setq opoint (point)) | |
| 1042 | (if (and (>= (point) (+ 2 lim)) | |
| 1043 | (save-excursion | |
| 1044 | (forward-char -2) | |
| 1045 | (looking-at "\\*/"))) | |
| 1046 | (search-backward "/*" lim 'move) | |
| 1047 | (setq stop (or (<= (point) lim) | |
| 1048 | (save-excursion | |
| 1049 | (beginning-of-line) | |
| 1050 | (skip-chars-forward " \t") | |
| 1051 | (not (looking-at "#"))))) | |
| 1052 | (or stop (beginning-of-line)))))) | |
| 1053 | ||
| 1054 | (defun c-backward-to-start-of-continued-exp (lim) | |
| 1055 | (if (memq (preceding-char) '(?\) ?\")) | |
| 1056 | (forward-sexp -1)) | |
| 1057 | (beginning-of-line) | |
| 1058 | (if (<= (point) lim) | |
| 1059 | (goto-char (1+ lim))) | |
| 1060 | (skip-chars-forward " \t")) | |
| 1061 | ||
| 1062 | (defun c-backward-to-start-of-if (&optional limit) | |
| 1063 | "Move to the start of the last \"unbalanced\" `if'." | |
| 1064 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
| 1065 | (let ((if-level 1) | |
| 1066 | (case-fold-search nil)) | |
| 1067 | (while (and (not (bobp)) (not (zerop if-level))) | |
| 1068 | (backward-sexp 1) | |
| 401662cb RS |
1069 | (cond ((and (looking-at "else\\b") |
| 1070 | (not (looking-at "else\\s_"))) | |
| a17915dc | 1071 | (setq if-level (1+ if-level))) |
| 401662cb RS |
1072 | ((and (looking-at "if\\b") |
| 1073 | (not (looking-at "if\\s_"))) | |
| a17915dc ER |
1074 | (setq if-level (1- if-level))) |
| 1075 | ((< (point) limit) | |
| 1076 | (setq if-level 0) | |
| 1077 | (goto-char limit)))))) | |
| 1078 | ||
| 1079 | (defun c-backward-to-start-of-do (&optional limit) | |
| 1080 | "If point follows a `do' statement, move to beginning of it and return t. | |
| 1081 | Otherwise return nil and don't move point." | |
| 1082 | (or limit (setq limit (save-excursion (beginning-of-defun) (point)))) | |
| 1083 | (let ((first t) | |
| 1084 | (startpos (point)) | |
| 1085 | (done nil)) | |
| 1086 | (while (not done) | |
| 1087 | (let ((next-start (point))) | |
| 1088 | (condition-case nil | |
| 1089 | ;; Move back one token or one brace or paren group. | |
| 1090 | (backward-sexp 1) | |
| 1091 | ;; If we find an open-brace, we lose. | |
| 1092 | (error (setq done 'fail))) | |
| 1093 | (if done | |
| 1094 | nil | |
| 1095 | ;; If we reached a `do', we win. | |
| 1096 | (if (looking-at "do\\b") | |
| 1097 | (setq done 'succeed) | |
| 1098 | ;; Otherwise, if we skipped a semicolon, we lose. | |
| 1099 | ;; (Exception: we can skip one semicolon before getting | |
| 1100 | ;; to a the last token of the statement, unless that token | |
| 1101 | ;; is a close brace.) | |
| 1102 | (if (save-excursion | |
| 1103 | (forward-sexp 1) | |
| 1104 | (or (and (not first) (= (preceding-char) ?})) | |
| 1105 | (search-forward ";" next-start t | |
| 1106 | (if (and first | |
| 1107 | (/= (preceding-char) ?})) | |
| 1108 | 2 1)))) | |
| 1109 | (setq done 'fail) | |
| 1110 | (setq first nil) | |
| 1111 | ;; If we go too far back in the buffer, we lose. | |
| 1112 | (if (< (point) limit) | |
| 1113 | (setq done 'fail))))))) | |
| 1114 | (if (eq done 'succeed) | |
| 1115 | t | |
| 1116 | (goto-char startpos) | |
| 1117 | nil))) | |
| 1118 | \f | |
| 1119 | (defun c-beginning-of-statement (count) | |
| 1120 | "Go to the beginning of the innermost C statement. | |
| 1121 | With prefix arg, go back N - 1 statements. If already at the beginning of a | |
| eb8c3be9 | 1122 | statement then go to the beginning of the preceding one. |
| 17f0e88a RS |
1123 | If within a string or comment, or next to a comment (only whitespace between), |
| 1124 | move by sentences instead of statements." | |
| a17915dc | 1125 | (interactive "p") |
| d4fbc2d5 RS |
1126 | (let ((here (point)) state) |
| 1127 | (save-excursion | |
| 1128 | (beginning-of-defun) | |
| 1129 | (setq state (parse-partial-sexp (point) here nil nil))) | |
| 17f0e88a RS |
1130 | (if (or (nth 3 state) (nth 4 state) |
| 1131 | (looking-at (concat "[ \t]*" comment-start-skip)) | |
| 1132 | (save-excursion (skip-chars-backward " \t") | |
| 1133 | (goto-char (- (point) 2)) | |
| 1134 | (looking-at "\\*/"))) | |
| d4fbc2d5 RS |
1135 | (forward-sentence (- count)) |
| 1136 | (while (> count 0) | |
| 1137 | (c-beginning-of-statement-1) | |
| 1138 | (setq count (1- count))) | |
| 1139 | (while (< count 0) | |
| 1140 | (c-end-of-statement-1) | |
| 1141 | (setq count (1+ count)))))) | |
| a17915dc ER |
1142 | |
| 1143 | (defun c-end-of-statement (count) | |
| 1144 | "Go to the end of the innermost C statement. | |
| d4fbc2d5 RS |
1145 | With prefix arg, go forward N - 1 statements. |
| 1146 | Move forward to end of the next statement if already at end. | |
| 1147 | If within a string or comment, move by sentences instead of statements." | |
| a17915dc ER |
1148 | (interactive "p") |
| 1149 | (c-beginning-of-statement (- count))) | |
| 1150 | ||
| 1151 | (defun c-beginning-of-statement-1 () | |
| 1152 | (let ((last-begin (point)) | |
| 1153 | (first t)) | |
| 1154 | (condition-case () | |
| 1155 | (progn | |
| 1156 | (while (and (not (bobp)) | |
| 1157 | (progn | |
| 1158 | (backward-sexp 1) | |
| 1159 | (or first | |
| 1160 | (not (re-search-forward "[;{}]" last-begin t))))) | |
| 1161 | (setq last-begin (point) first nil)) | |
| 1162 | (goto-char last-begin)) | |
| 1163 | (error (if first (backward-up-list 1) (goto-char last-begin)))))) | |
| 1164 | ||
| 1165 | (defun c-end-of-statement-1 () | |
| 1166 | (condition-case () | |
| 1167 | (progn | |
| 1168 | (while (and (not (eobp)) | |
| 1169 | (let ((beg (point))) | |
| 1170 | (forward-sexp 1) | |
| 1171 | (let ((end (point))) | |
| 1172 | (save-excursion | |
| 1173 | (goto-char beg) | |
| 1174 | (not (re-search-forward "[;{}]" end t))))))) | |
| 1175 | (re-search-backward "[;}]") | |
| 1176 | (forward-char 1)) | |
| 1177 | (error | |
| 1178 | (let ((beg (point))) | |
| 1179 | (backward-up-list -1) | |
| 1180 | (let ((end (point))) | |
| 1181 | (goto-char beg) | |
| 1182 | (search-forward ";" end 'move)))))) | |
| 1183 | \f | |
| 1184 | (defun mark-c-function () | |
| 1185 | "Put mark at end of C function, point at beginning." | |
| 1186 | (interactive) | |
| 1187 | (push-mark (point)) | |
| 1188 | (end-of-defun) | |
| 069b6ce3 | 1189 | (push-mark (point) nil t) |
| a17915dc ER |
1190 | (beginning-of-defun) |
| 1191 | (backward-paragraph)) | |
| 1192 | \f | |
| eccf8697 RS |
1193 | ;; Idea of ENDPOS is, indent each line, stopping when |
| 1194 | ;; ENDPOS is encountered. But it's too much of a pain to make that work. | |
| a17915dc | 1195 | (defun indent-c-exp (&optional endpos) |
| eccf8697 | 1196 | "Indent each line of the C grouping following point." |
| a17915dc ER |
1197 | (interactive) |
| 1198 | (let* ((indent-stack (list nil)) | |
| 1199 | (opoint (point)) ;; May be altered below. | |
| 1200 | (contain-stack | |
| 1201 | (list (if endpos | |
| 1202 | (let (funbeg) | |
| 1203 | ;; Find previous fcn-start. | |
| 1204 | (save-excursion (forward-char 1) | |
| 1205 | (beginning-of-defun) | |
| 1206 | (setq funbeg (point))) | |
| 9ce49c8d | 1207 | (setq opoint funbeg) |
| a17915dc ER |
1208 | ;; Try to find containing open, |
| 1209 | ;; but don't scan past that fcn-start. | |
| 1210 | (save-restriction | |
| 1211 | (narrow-to-region funbeg (point)) | |
| 1212 | (condition-case nil | |
| 1213 | (save-excursion | |
| 9ce49c8d RS |
1214 | (backward-up-list 1) |
| 1215 | (point)) | |
| a17915dc ER |
1216 | ;; We gave up: must be between fcns. |
| 1217 | ;; Set opoint to beg of prev fcn | |
| 1218 | ;; since otherwise calculate-c-indent | |
| 1219 | ;; will get wrong answers. | |
| 1220 | (error (setq opoint funbeg) | |
| 1221 | (point))))) | |
| 1222 | (point)))) | |
| 1223 | (case-fold-search nil) | |
| 1224 | restart outer-loop-done inner-loop-done state ostate | |
| 1225 | this-indent last-sexp | |
| 1226 | at-else at-brace at-while | |
| 3bbf6363 | 1227 | last-depth this-point |
| a17915dc ER |
1228 | (next-depth 0)) |
| 1229 | ;; If the braces don't match, get an error right away. | |
| 1230 | (save-excursion | |
| 1231 | (forward-sexp 1)) | |
| 1232 | ;; Realign the comment on the first line, even though we don't reindent it. | |
| 1233 | (save-excursion | |
| 1234 | (let ((beg (point))) | |
| 1235 | (and (re-search-forward | |
| 1236 | comment-start-skip | |
| 1237 | (save-excursion (end-of-line) (point)) t) | |
| 9ce49c8d RS |
1238 | ;; Make sure this isn't a comment alone on a line |
| 1239 | ;; (which should be indented like code instead). | |
| 1240 | (save-excursion | |
| 1241 | (goto-char (match-beginning 0)) | |
| 1242 | (skip-chars-backward " \t") | |
| 1243 | (not (bolp))) | |
| a17915dc ER |
1244 | ;; Make sure the comment starter we found |
| 1245 | ;; is not actually in a string or quoted. | |
| 1246 | (let ((new-state | |
| 1247 | (parse-partial-sexp beg (point) | |
| 1248 | nil nil state))) | |
| 1249 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
| 1250 | (progn (indent-for-comment) (beginning-of-line))))) | |
| 1251 | (save-excursion | |
| 1252 | (setq outer-loop-done nil) | |
| 1253 | (while (and (not (eobp)) | |
| 1254 | (if endpos (< (point) endpos) | |
| 1255 | (not outer-loop-done))) | |
| 1256 | (setq last-depth next-depth) | |
| 1257 | ;; Compute how depth changes over this line | |
| 1258 | ;; plus enough other lines to get to one that | |
| 1259 | ;; does not end inside a comment or string. | |
| 1260 | ;; Meanwhile, do appropriate indentation on comment lines. | |
| 1261 | (setq inner-loop-done nil) | |
| 1262 | (while (and (not inner-loop-done) | |
| 1263 | (not (and (eobp) (setq outer-loop-done t)))) | |
| 1264 | (setq ostate state) | |
| 1265 | (setq state (parse-partial-sexp (point) (progn (end-of-line) (point)) | |
| 1266 | nil nil state)) | |
| 1267 | (setq next-depth (car state)) | |
| 1268 | (if (and (car (cdr (cdr state))) | |
| 1269 | (>= (car (cdr (cdr state))) 0)) | |
| 1270 | (setq last-sexp (car (cdr (cdr state))))) | |
| 3bbf6363 RS |
1271 | ;; If this line started within a comment, indent it as such. |
| 1272 | (if (or (nth 4 ostate) (nth 7 ostate)) | |
| a17915dc | 1273 | (c-indent-line)) |
| 3bbf6363 RS |
1274 | ;; If it ends outside of comments or strings, exit the inner loop. |
| 1275 | ;; Otherwise move on to next line. | |
| 1276 | (if (or (nth 3 state) (nth 4 state) (nth 7 state)) | |
| a17915dc ER |
1277 | (forward-line 1) |
| 1278 | (setq inner-loop-done t))) | |
| 1279 | (and endpos | |
| 1280 | (while (< next-depth 0) | |
| 1281 | (setq indent-stack (append indent-stack (list nil))) | |
| 1282 | (setq contain-stack (append contain-stack (list nil))) | |
| 1283 | (setq next-depth (1+ next-depth)) | |
| 1284 | (setq last-depth (1+ last-depth)) | |
| 1285 | (setcar (nthcdr 6 state) (1+ (nth 6 state))))) | |
| 1286 | (setq outer-loop-done (and (not endpos) (<= next-depth 0))) | |
| 1287 | (if outer-loop-done | |
| 1288 | nil | |
| 1289 | ;; If this line had ..))) (((.. in it, pop out of the levels | |
| 1290 | ;; that ended anywhere in this line, even if the final depth | |
| 1291 | ;; doesn't indicate that they ended. | |
| 1292 | (while (> last-depth (nth 6 state)) | |
| 1293 | (setq indent-stack (cdr indent-stack) | |
| 1294 | contain-stack (cdr contain-stack) | |
| 1295 | last-depth (1- last-depth))) | |
| 1296 | (if (/= last-depth next-depth) | |
| 1297 | (setq last-sexp nil)) | |
| 1298 | ;; Add levels for any parens that were started in this line. | |
| 1299 | (while (< last-depth next-depth) | |
| 1300 | (setq indent-stack (cons nil indent-stack) | |
| 1301 | contain-stack (cons nil contain-stack) | |
| 1302 | last-depth (1+ last-depth))) | |
| 1303 | (if (null (car contain-stack)) | |
| 1304 | (setcar contain-stack (or (car (cdr state)) | |
| 1305 | (save-excursion (forward-sexp -1) | |
| 1306 | (point))))) | |
| 1307 | (forward-line 1) | |
| 1308 | (skip-chars-forward " \t") | |
| 9ce49c8d RS |
1309 | ;; Don't really reindent if the line is just whitespace, |
| 1310 | ;; or if it is past the endpos. | |
| 1311 | ;; (The exit test in the outer while | |
| 1312 | ;; does not exit until we have passed the first line | |
| 1313 | ;; past the region.) | |
| 1314 | (if (or (eolp) (and endpos (>= (point) endpos))) | |
| a17915dc | 1315 | nil |
| 73dae9a9 RS |
1316 | ;; Is this line in a new nesting level? |
| 1317 | ;; In other words, is this the first line that | |
| 1318 | ;; starts in the new level? | |
| a17915dc ER |
1319 | (if (and (car indent-stack) |
| 1320 | (>= (car indent-stack) 0)) | |
| 73dae9a9 RS |
1321 | nil |
| 1322 | ;; Yes. | |
| a17915dc | 1323 | ;; Compute the standard indent for this level. |
| 73dae9a9 RS |
1324 | (let (val) |
| 1325 | (if (= (char-after (car contain-stack)) ?{) | |
| 1326 | (save-excursion | |
| 1327 | (goto-char (car contain-stack)) | |
| 3a8a46f1 | 1328 | (setq val (calculate-c-indent-after-brace))) |
| 73dae9a9 RS |
1329 | (setq val (calculate-c-indent |
| 1330 | (if (car indent-stack) | |
| 1331 | (- (car indent-stack)) | |
| 1332 | opoint)))) | |
| 3746159f RS |
1333 | ;; t means we are in a block comment and should |
| 1334 | ;; calculate accordingly. | |
| 1335 | (if (eq val t) | |
| 1336 | (setq val (calculate-c-indent-within-comment))) | |
| 73dae9a9 RS |
1337 | (setcar indent-stack val))) |
| 1338 | ;; Adjust indent of this individual line | |
| 1339 | ;; based on its predecessor. | |
| 1340 | ;; Handle continuation lines, if, else, while, and so on. | |
| 1341 | (if (/= (char-after (car contain-stack)) ?{) | |
| 1342 | (setq this-indent (car indent-stack)) | |
| 1343 | ;; Line is at statement level. | |
| 1344 | ;; Is it a new statement? Is it an else? | |
| 1345 | ;; Find last non-comment character before this line | |
| 1346 | (save-excursion | |
| 1347 | (setq this-point (point)) | |
| 1348 | (setq at-else (and (looking-at "else\\b") | |
| 1349 | (not (looking-at "else\\s_")))) | |
| 1350 | (setq at-brace (= (following-char) ?{)) | |
| 1351 | (setq at-while (and (looking-at "while\\b") | |
| 1352 | (not (looking-at "while\\s_")))) | |
| 1353 | (if (= (following-char) ?}) | |
| 1354 | (setq this-indent (car indent-stack)) | |
| 1355 | (c-backward-to-noncomment opoint) | |
| 1356 | (if (not (memq (preceding-char) '(0 ?\, ?\; ?} ?: ?{))) | |
| 1357 | ;; Preceding line did not end in comma or semi; | |
| 1358 | ;; indent this line c-continued-statement-offset | |
| 1359 | ;; more than previous. | |
| 1360 | (progn | |
| 1361 | (c-backward-to-start-of-continued-exp (car contain-stack)) | |
| 1362 | (setq this-indent | |
| 1363 | (+ c-continued-statement-offset (current-column) | |
| 1364 | (if at-brace c-continued-brace-offset 0)))) | |
| 1365 | ;; Preceding line ended in comma or semi; | |
| 1366 | ;; use the standard indent for this level. | |
| 1367 | (cond (at-else (progn (c-backward-to-start-of-if opoint) | |
| 1368 | (setq this-indent | |
| 1369 | (current-indentation)))) | |
| 1370 | ((and at-while (c-backward-to-start-of-do opoint)) | |
| 1371 | (setq this-indent (current-indentation))) | |
| 1372 | ((eq (preceding-char) ?\,) | |
| 1373 | (goto-char this-point) | |
| 1374 | (setq this-indent (calculate-c-indent))) | |
| 1375 | (t (setq this-indent (car indent-stack)))))))) | |
| a17915dc | 1376 | ;; Adjust line indentation according to its contents |
| 3a65941e | 1377 | (if (or (looking-at c-switch-label-regexp) |
| a17915dc ER |
1378 | (and (looking-at "[A-Za-z]") |
| 1379 | (save-excursion | |
| 1380 | (forward-sexp 1) | |
| 1381 | (looking-at ":")))) | |
| 1382 | (setq this-indent (max 1 (+ this-indent c-label-offset)))) | |
| 1383 | (if (= (following-char) ?}) | |
| 1384 | (setq this-indent (- this-indent c-indent-level))) | |
| 1385 | (if (= (following-char) ?{) | |
| e6033883 RS |
1386 | ;; Don't move an open-brace in column 0. |
| 1387 | ;; This is good when constructs such as | |
| 1388 | ;; `extern "C" {' surround a function definition | |
| 1389 | ;; that should be indented as usual. | |
| 1390 | ;; It is also good for nested functions. | |
| 1391 | ;; It is bad when an open-brace is indented at column 0 | |
| 1392 | ;; and you want to fix that, but we can't win 'em all. | |
| b70af8d7 RS |
1393 | (if (zerop (current-column)) |
| 1394 | (setq this-indent 0) | |
| 1395 | (setq this-indent (+ this-indent c-brace-offset)))) | |
| a17915dc ER |
1396 | ;; Don't leave indentation in empty lines. |
| 1397 | (if (eolp) (setq this-indent 0)) | |
| 1398 | ;; Put chosen indentation into effect. | |
| 1399 | (or (= (current-column) this-indent) | |
| 1400 | (= (following-char) ?\#) | |
| 1401 | (progn | |
| 1402 | (delete-region (point) (progn (beginning-of-line) (point))) | |
| 1403 | (indent-to this-indent))) | |
| 1404 | ;; Indent any comment following the text. | |
| 1405 | (or (looking-at comment-start-skip) | |
| 62057cef RS |
1406 | (save-excursion |
| 1407 | (let ((beg (point))) | |
| 1408 | (and (re-search-forward | |
| 1409 | comment-start-skip | |
| 1410 | (save-excursion (end-of-line) (point)) t) | |
| 1411 | ;; Make sure the comment starter we found | |
| 1412 | ;; is not actually in a string or quoted. | |
| 1413 | (let ((new-state | |
| 1414 | (parse-partial-sexp beg (point) | |
| 1415 | nil nil state))) | |
| 1416 | (and (not (nth 3 new-state)) (not (nth 5 new-state)))) | |
| 1417 | (indent-for-comment))))))))))) | |
| a17915dc ER |
1418 | |
| 1419 | ;; Look at all comment-start strings in the current line after point. | |
| 1420 | ;; Return t if one of them starts a real comment. | |
| 1421 | ;; This is not used yet, because indent-for-comment | |
| 1422 | ;; isn't smart enough to handle the cases this can find. | |
| 1423 | (defun indent-c-find-real-comment () | |
| 1424 | (let (win) | |
| 1425 | (while (and (not win) | |
| 1426 | (re-search-forward comment-start-skip | |
| 1427 | (save-excursion (end-of-line) (point)) | |
| 1428 | t)) | |
| 1429 | ;; Make sure the comment start is not quoted. | |
| 1430 | (let ((state-1 | |
| 1431 | (parse-partial-sexp | |
| 1432 | (save-excursion (beginning-of-line) (point)) | |
| 1433 | (point) nil nil state))) | |
| 1434 | (setq win (and (null (nth 3 state-1)) (null (nth 5 state-1)))))) | |
| 1435 | win)) | |
| 1436 | ||
| 1437 | ;; Indent every line whose first char is between START and END inclusive. | |
| 1438 | (defun c-indent-region (start end) | |
| 1439 | (save-excursion | |
| 1440 | (goto-char start) | |
| 988e2aa6 RS |
1441 | ;; Advance to first nonblank line. |
| 1442 | (skip-chars-forward " \t\n") | |
| 1443 | (beginning-of-line) | |
| eccf8697 RS |
1444 | (let ((endmark (copy-marker end)) |
| 1445 | (c-tab-always-indent t)) | |
| d52fd67c | 1446 | (while (and (bolp) (not (eobp)) (< (point) endmark)) |
| eccf8697 RS |
1447 | ;; Indent one line as with TAB. |
| 1448 | (let ((shift-amt (c-indent-line)) | |
| 4fd99ee4 | 1449 | nextline sexpbeg sexpend) |
| d52fd67c RS |
1450 | (if (save-excursion (beginning-of-line) (looking-at "[ \t]*#")) |
| 1451 | (forward-line 1) | |
| eccf8697 | 1452 | (save-excursion |
| d52fd67c RS |
1453 | ;; Find beginning of following line. |
| 1454 | (save-excursion | |
| 1455 | (forward-line 1) (setq nextline (point))) | |
| 1456 | ;; Find first beginning-of-sexp for sexp extending past this line. | |
| 1457 | (beginning-of-line) | |
| 1458 | (while (< (point) nextline) | |
| 1459 | (condition-case nil | |
| 1460 | (progn | |
| 1461 | (forward-sexp 1) | |
| 1462 | (setq sexpend (point-marker))) | |
| 1463 | (error (setq sexpend nil) | |
| 1464 | (goto-char nextline))) | |
| 1465 | (skip-chars-forward " \t\n")) | |
| 1466 | (if sexpend | |
| eccf8697 | 1467 | (progn |
| d52fd67c RS |
1468 | ;; Make sure the sexp we found really starts on the |
| 1469 | ;; current line and extends past it. | |
| 1470 | (goto-char sexpend) | |
| 1471 | (backward-sexp 1) | |
| 1472 | (setq sexpbeg (point))))) | |
| 1473 | ;; If that sexp ends within the region, | |
| 1474 | ;; indent it all at once, fast. | |
| 1475 | (if (and sexpend (> sexpend nextline) (<= sexpend endmark) | |
| 1476 | (< sexpbeg nextline)) | |
| 0b171628 | 1477 | (progn |
| d52fd67c RS |
1478 | (indent-c-exp) |
| 1479 | (goto-char sexpend))) | |
| 1480 | ;; Move to following line and try again. | |
| 1481 | (and sexpend (set-marker sexpend nil)) | |
| 1482 | (forward-line 1)))) | |
| a17915dc ER |
1483 | (set-marker endmark nil)))) |
| 1484 | \f | |
| 1832dbd1 | 1485 | (defun set-c-style (style &optional global) |
| a17915dc | 1486 | "Set C-mode variables to use one of several different indentation styles. |
| 1832dbd1 RS |
1487 | The arguments are a string representing the desired style |
| 1488 | and a flag which, if non-nil, means to set the style globally. | |
| 1489 | \(Interactively, the flag comes from the prefix argument.) | |
| e6dfdce5 | 1490 | Available styles are GNU, K&R, BSD and Whitesmith." |
| 389817fd KH |
1491 | (interactive (list (let ((completion-ignore-case t)) |
| 1492 | (completing-read "Use which C indentation style? " | |
| 1493 | c-style-alist nil t)) | |
| 1832dbd1 | 1494 | current-prefix-arg)) |
| a17915dc | 1495 | (let ((vars (cdr (assoc style c-style-alist)))) |
| 1832dbd1 RS |
1496 | (or vars |
| 1497 | (error "Invalid C indentation style `%s'" style)) | |
| a17915dc | 1498 | (while vars |
| 1832dbd1 RS |
1499 | (or global |
| 1500 | (make-local-variable (car (car vars)))) | |
| a17915dc ER |
1501 | (set (car (car vars)) (cdr (car vars))) |
| 1502 | (setq vars (cdr vars))))) | |
| 1832dbd1 RS |
1503 | \f |
| 1504 | ;;; This page handles insertion and removal of backslashes for C macros. | |
| 1505 | ||
| 1506 | (defvar c-backslash-column 48 | |
| 1507 | "*Minimum column for end-of-line backslashes of macro definitions.") | |
| 1508 | ||
| 1509 | (defun c-backslash-region (from to delete-flag) | |
| 1510 | "Insert, align, or delete end-of-line backslashes on the lines in the region. | |
| 1511 | With no argument, inserts backslashes and aligns existing backslashes. | |
| 1512 | With an argument, deletes the backslashes. | |
| 1513 | ||
| 1514 | This function does not modify the last line of the region if the region ends | |
| 1515 | right at the start of the following line; it does not modify blank lines | |
| 1516 | at the start of the region. So you can put the region around an entire macro | |
| 1517 | definition and conveniently use this command." | |
| 1518 | (interactive "r\nP") | |
| 1519 | (save-excursion | |
| 1520 | (goto-char from) | |
| 1521 | (let ((column c-backslash-column) | |
| 1522 | (endmark (make-marker))) | |
| 1523 | (move-marker endmark to) | |
| 1524 | ;; Compute the smallest column number past the ends of all the lines. | |
| 1525 | (if (not delete-flag) | |
| 1526 | (while (< (point) to) | |
| 1527 | (end-of-line) | |
| 1528 | (if (= (preceding-char) ?\\) | |
| 1529 | (progn (forward-char -1) | |
| 1530 | (skip-chars-backward " \t"))) | |
| 1531 | (setq column (max column (1+ (current-column)))) | |
| 1532 | (forward-line 1))) | |
| 1533 | ;; Adjust upward to a tab column, if that doesn't push past the margin. | |
| 1534 | (if (> (% column tab-width) 0) | |
| 1535 | (let ((adjusted (* (/ (+ column tab-width -1) tab-width) tab-width))) | |
| 1536 | (if (< adjusted (window-width)) | |
| 1537 | (setq column adjusted)))) | |
| 1538 | ;; Don't modify blank lines at start of region. | |
| 1539 | (goto-char from) | |
| 1540 | (while (and (< (point) endmark) (eolp)) | |
| 1541 | (forward-line 1)) | |
| 1542 | ;; Add or remove backslashes on all the lines. | |
| 1543 | (while (and (< (point) endmark) | |
| 1544 | ;; Don't backslashify the last line | |
| 1545 | ;; if the region ends right at the start of the next line. | |
| 1546 | (save-excursion | |
| 1547 | (forward-line 1) | |
| 1548 | (< (point) endmark))) | |
| 1549 | (if (not delete-flag) | |
| 1550 | (c-append-backslash column) | |
| 1551 | (c-delete-backslash)) | |
| 1552 | (forward-line 1)) | |
| 1553 | (move-marker endmark nil)))) | |
| 1554 | ||
| 1555 | (defun c-append-backslash (column) | |
| 1556 | (end-of-line) | |
| 1557 | ;; Note that "\\\\" is needed to get one backslash. | |
| 1558 | (if (= (preceding-char) ?\\) | |
| 1559 | (progn (forward-char -1) | |
| 1560 | (delete-horizontal-space) | |
| 1561 | (indent-to column)) | |
| 1562 | (indent-to column) | |
| 1563 | (insert "\\"))) | |
| 1564 | ||
| 1565 | (defun c-delete-backslash () | |
| 1566 | (end-of-line) | |
| 7620dcc5 RS |
1567 | (or (bolp) |
| 1568 | (progn | |
| 1569 | (forward-char -1) | |
| 1570 | (if (looking-at "\\\\") | |
| 1571 | (delete-region (1+ (point)) | |
| 1572 | (progn (skip-chars-backward " \t") (point))))))) | |
| 1586b965 RS |
1573 | \f |
| 1574 | (defun c-up-conditional (count) | |
| 1575 | "Move back to the containing preprocessor conditional, leaving mark behind. | |
| 1576 | A prefix argument acts as a repeat count. With a negative argument, | |
| 1577 | move forward to the end of the containing preprocessor conditional. | |
| 1578 | When going backwards, `#elif' is treated like `#else' followed by `#if'. | |
| 1579 | When going forwards, `#elif' is ignored." | |
| 1580 | (interactive "p") | |
| 3c8aaef2 RS |
1581 | (c-forward-conditional (- count) t)) |
| 1582 | ||
| 1583 | (defun c-backward-conditional (count &optional up-flag) | |
| 1584 | "Move back across a preprocessor conditional, leaving mark behind. | |
| 1585 | A prefix argument acts as a repeat count. With a negative argument, | |
| 1586 | move forward across a preprocessor conditional." | |
| 1587 | (interactive "p") | |
| 1588 | (c-forward-conditional (- count) up-flag)) | |
| 1589 | ||
| 1590 | (defun c-forward-conditional (count &optional up-flag) | |
| 1591 | "Move forward across a preprocessor conditional, leaving mark behind. | |
| 1592 | A prefix argument acts as a repeat count. With a negative argument, | |
| 1593 | move backward across a preprocessor conditional." | |
| 1594 | (interactive "p") | |
| 1595 | (let* ((forward (> count 0)) | |
| 1586b965 RS |
1596 | (increment (if forward -1 1)) |
| 1597 | (search-function (if forward 're-search-forward 're-search-backward)) | |
| 1598 | (opoint (point)) | |
| 1599 | (new)) | |
| 1600 | (save-excursion | |
| 1601 | (while (/= count 0) | |
| 3c8aaef2 | 1602 | (let ((depth (if up-flag 0 -1)) found) |
| 1586b965 RS |
1603 | (save-excursion |
| 1604 | ;; Find the "next" significant line in the proper direction. | |
| 1605 | (while (and (not found) | |
| 1606 | ;; Rather than searching for a # sign that comes | |
| 1607 | ;; at the beginning of a line aside from whitespace, | |
| 1608 | ;; search first for a string starting with # sign. | |
| 1609 | ;; Then verify what precedes it. | |
| 1610 | ;; This is faster on account of the fastmap feature of | |
| 1611 | ;; the regexp matcher. | |
| 1612 | (funcall search-function | |
| 1613 | "#[ \t]*\\(if\\|elif\\|endif\\)" | |
| 1e2d7cce | 1614 | nil t)) |
| 1586b965 | 1615 | (beginning-of-line) |
| 1e2d7cce RS |
1616 | ;; Now verify it is really a preproc line. |
| 1617 | (if (looking-at "^[ \t]*#[ \t]*\\(if\\|elif\\|endif\\)") | |
| 3c8aaef2 | 1618 | (let ((prev depth)) |
| 1e2d7cce RS |
1619 | ;; Update depth according to what we found. |
| 1620 | (beginning-of-line) | |
| 1621 | (cond ((looking-at "[ \t]*#[ \t]*endif") | |
| 1622 | (setq depth (+ depth increment))) | |
| 1623 | ((looking-at "[ \t]*#[ \t]*elif") | |
| 1624 | (if (and forward (= depth 0)) | |
| 1625 | (setq found (point)))) | |
| 1626 | (t (setq depth (- depth increment)))) | |
| 3c8aaef2 RS |
1627 | ;; If we are trying to move across, and we find |
| 1628 | ;; an end before we find a beginning, get an error. | |
| 1629 | (if (and (< prev 0) (< depth prev)) | |
| 1630 | (error (if forward | |
| 1631 | "No following conditional at this level" | |
| 1632 | "No previous conditional at this level"))) | |
| 1633 | ;; When searching forward, start from next line | |
| 1634 | ;; so that we don't find the same line again. | |
| 1635 | (if forward (forward-line 1)) | |
| 1e2d7cce RS |
1636 | ;; If this line exits a level of conditional, exit inner loop. |
| 1637 | (if (< depth 0) | |
| 29869734 RS |
1638 | (setq found (point)))) |
| 1639 | ;; If the line is not really a conditional, skip past it. | |
| 1640 | (if forward (end-of-line))))) | |
| 1586b965 RS |
1641 | (or found |
| 1642 | (error "No containing preprocessor conditional")) | |
| 1643 | (goto-char (setq new found))) | |
| 3c8aaef2 | 1644 | (setq count (+ count increment)))) |
| 1586b965 RS |
1645 | (push-mark) |
| 1646 | (goto-char new))) | |
| c0274f38 ER |
1647 | |
| 1648 | ;;; c-mode.el ends here |