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date Mon, 13 Aug 2007 09:44:42 +0200
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164:4e0740e5aab2 165:5a88923fcbfe
1 ;;; cc-align.el --- custom indentation functions for CC Mode
2
3 ;; Copyright (C) 1985,87,92,93,94,95,96,97 Free Software Foundation, Inc.
4
5 ;; Authors: 1992-1997 Barry A. Warsaw
6 ;; 1987 Dave Detlefs and Stewart Clamen
7 ;; 1985 Richard M. Stallman
8 ;; Maintainer: cc-mode-help@python.org
9 ;; Created: 22-Apr-1997 (split from cc-mode.el)
10 ;; Version: 5.11
11 ;; Keywords: c languages oop
12
13 ;; This file is part of GNU Emacs.
14
15 ;; GNU Emacs is free software; you can redistribute it and/or modify
16 ;; it under the terms of the GNU General Public License as published by
17 ;; the Free Software Foundation; either version 2, or (at your option)
18 ;; any later version.
19
20 ;; GNU Emacs is distributed in the hope that it will be useful,
21 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
22 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
23 ;; GNU General Public License for more details.
24
25 ;; You should have received a copy of the GNU General Public License
26 ;; along with GNU Emacs; see the file COPYING. If not, write to the
27 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
28 ;; Boston, MA 02111-1307, USA.
29
30
31 (eval-when-compile
32 (load-file "./cc-engine.el"))
33
34 (defsubst c-langelem-col (langelem &optional preserve-point)
35 ;; convenience routine to return the column of langelem's relpos.
36 ;; Leaves point at the relpos unless preserve-point is non-nil.
37 (let ((here (point)))
38 (goto-char (cdr langelem))
39 (prog1 (current-column)
40 (if preserve-point
41 (goto-char here))
42 )))
43
44
45 ;; Standard indentation line-ups
46 (defun c-lineup-arglist (langelem)
47 ;; lineup the current arglist line with the arglist appearing just
48 ;; after the containing paren which starts the arglist.
49 (save-excursion
50 (let* ((containing-sexp
51 (save-excursion
52 ;; arglist-cont-nonempty gives relpos ==
53 ;; to boi of containing-sexp paren. This
54 ;; is good when offset is +, but bad
55 ;; when it is c-lineup-arglist, so we
56 ;; have to special case a kludge here.
57 (if (memq (car langelem) '(arglist-intro arglist-cont-nonempty))
58 (progn
59 (beginning-of-line)
60 (backward-up-list 1)
61 (skip-chars-forward " \t" (c-point 'eol)))
62 (goto-char (cdr langelem)))
63 (point)))
64 (langelem-col (c-langelem-col langelem t)))
65 (if (save-excursion
66 (beginning-of-line)
67 (looking-at "[ \t]*)"))
68 (progn (goto-char (match-end 0))
69 (forward-sexp -1)
70 (forward-char 1)
71 (c-forward-syntactic-ws)
72 (- (current-column) langelem-col))
73 (goto-char containing-sexp)
74 (or (eolp)
75 (not (memq (following-char) '(?{ ?\( )))
76 (let ((eol (c-point 'eol))
77 (here (progn
78 (forward-char 1)
79 (skip-chars-forward " \t")
80 (point))))
81 (c-forward-syntactic-ws)
82 (if (< (point) eol)
83 (goto-char here))))
84 (- (current-column) langelem-col)
85 ))))
86
87 (defun c-lineup-arglist-intro-after-paren (langelem)
88 ;; lineup an arglist-intro line to just after the open paren
89 (save-excursion
90 (let ((langelem-col (c-langelem-col langelem t))
91 (ce-curcol (save-excursion
92 (beginning-of-line)
93 (backward-up-list 1)
94 (skip-chars-forward " \t" (c-point 'eol))
95 (current-column))))
96 (- ce-curcol langelem-col -1))))
97
98 (defun c-lineup-arglist-close-under-paren (langelem)
99 ;; lineup an arglist-intro line to just after the open paren
100 (save-excursion
101 (let ((langelem-col (c-langelem-col langelem t))
102 (ce-curcol (save-excursion
103 (beginning-of-line)
104 (backward-up-list 1)
105 (current-column))))
106 (- ce-curcol langelem-col))))
107
108 (defun c-lineup-streamop (langelem)
109 ;; lineup stream operators
110 (save-excursion
111 (let ((langelem-col (c-langelem-col langelem)))
112 (re-search-forward "<<\\|>>" (c-point 'eol) 'move)
113 (goto-char (match-beginning 0))
114 (- (current-column) langelem-col))))
115
116 (defun c-lineup-multi-inher (langelem)
117 ;; line up multiple inheritance lines
118 (save-excursion
119 (let ((eol (c-point 'eol))
120 (here (point))
121 (langelem-col (c-langelem-col langelem)))
122 (skip-chars-forward "^:" eol)
123 (skip-chars-forward " \t:" eol)
124 (if (or (eolp)
125 (looking-at c-comment-start-regexp))
126 (c-forward-syntactic-ws here))
127 (- (current-column) langelem-col)
128 )))
129
130 (defun c-lineup-java-inher (langelem)
131 ;; line up Java implements and extends continuations
132 (save-excursion
133 (let ((langelem-col (c-langelem-col langelem)))
134 (forward-word 1)
135 (if (looking-at "[ \t]*$")
136 langelem-col
137 (c-forward-syntactic-ws)
138 (- (current-column) langelem-col)))))
139
140 (defun c-lineup-java-throws (langelem)
141 ;; lineup func-decl-cont's in Java which are continuations of throws
142 ;; declarations. If `throws' starts the previous line, line up to
143 ;; just after that keyword. If not, lineup under the previous line.
144 (save-excursion
145 (let ((iopl (c-point 'iopl))
146 (langelem-col (c-langelem-col langelem t))
147 (extra 0))
148 (back-to-indentation)
149 (cond
150 ((looking-at "throws[ \t\n]")
151 (goto-char (cdr langelem))
152 (setq extra c-basic-offset))
153 ((and (goto-char iopl)
154 (looking-at "throws[ \t\n]"))
155 (forward-word 1)
156 (skip-chars-forward " \t")
157 (when (eolp)
158 (back-to-indentation)
159 (setq extra c-basic-offset)))
160 (t (goto-char iopl)))
161 (+ (- (current-column) langelem-col) extra))))
162
163 (defun c-lineup-C-comments (langelem)
164 ;; line up C block comment continuation lines
165 (save-excursion
166 (let ((here (point))
167 (stars (progn (back-to-indentation)
168 (skip-chars-forward "*")))
169 (langelem-col (c-langelem-col langelem)))
170 (back-to-indentation)
171 (if (not (re-search-forward "/\\([*]+\\)" (c-point 'eol) t))
172 (progn
173 (if (not (looking-at "[*]+"))
174 (progn
175 ;; we now have to figure out where this comment begins.
176 (goto-char here)
177 (back-to-indentation)
178 (if (looking-at "[*]+/")
179 (progn (goto-char (match-end 0))
180 (forward-comment -1))
181 (goto-char (cdr langelem))
182 (back-to-indentation))))
183 (- (current-column) langelem-col))
184 (if (zerop stars)
185 (progn
186 (skip-chars-forward " \t")
187 (- (current-column) langelem-col))
188 ;; how many stars on comment opening line? if greater than
189 ;; on current line, align left. if less than or equal,
190 ;; align right. this should also pick up Javadoc style
191 ;; comments.
192 (if (> (length (match-string 1)) stars)
193 (progn
194 (back-to-indentation)
195 (- (current-column) -1 langelem-col))
196 (- (current-column) stars langelem-col))
197 )))))
198
199 (defun c-lineup-comment (langelem)
200 ;; support old behavior for comment indentation. we look at
201 ;; c-comment-only-line-offset to decide how to indent comment
202 ;; only-lines
203 (save-excursion
204 (back-to-indentation)
205 ;; this highly kludgiforous flag prevents the mapcar over
206 ;; c-syntactic-context from entering an infinite loop
207 (let ((recurse-prevention-flag (boundp 'recurse-prevention-flag)))
208 (cond
209 ;; CASE 1: preserve comment-column
210 (recurse-prevention-flag 0)
211 ((= (current-column) comment-column)
212 ;; we have to subtract out all other indentation
213 (- comment-column (apply '+ (mapcar 'c-get-offset
214 c-syntactic-context))))
215 ;; indent as specified by c-comment-only-line-offset
216 ((not (bolp))
217 (or (car-safe c-comment-only-line-offset)
218 c-comment-only-line-offset))
219 (t
220 (or (cdr-safe c-comment-only-line-offset)
221 (car-safe c-comment-only-line-offset)
222 -1000)) ;jam it against the left side
223 ))))
224
225 (defun c-lineup-runin-statements (langelem)
226 ;; line up statements in coding standards which place the first
227 ;; statement on the same line as the block opening brace.
228 (if (= (char-after (cdr langelem)) ?{)
229 (save-excursion
230 (let ((langelem-col (c-langelem-col langelem)))
231 (forward-char 1)
232 (skip-chars-forward " \t")
233 (- (current-column) langelem-col)))
234 0))
235
236 (defun c-lineup-math (langelem)
237 ;; line up math statement-cont after the equals
238 (save-excursion
239 (let ((equalp (save-excursion
240 (goto-char (c-point 'boi))
241 (skip-chars-forward "^=" (c-point 'eol))
242 (and (= (following-char) ?=)
243 (- (point) (c-point 'boi)))))
244 (langelem-col (c-langelem-col langelem))
245 donep)
246 (while (and (not donep)
247 (< (point) (c-point 'eol)))
248 (skip-chars-forward "^=" (c-point 'eol))
249 (if (c-in-literal (cdr langelem))
250 (forward-char 1)
251 (setq donep t)))
252 (if (/= (following-char) ?=)
253 ;; there's no equal sign on the line
254 c-basic-offset
255 ;; calculate indentation column after equals and ws, unless
256 ;; our line contains an equals sign
257 (if (not equalp)
258 (progn
259 (forward-char 1)
260 (skip-chars-forward " \t")
261 (setq equalp 0)))
262 (- (current-column) equalp langelem-col))
263 )))
264
265 (defun c-lineup-ObjC-method-call (langelem)
266 ;; Line up methods args as elisp-mode does with function args: go to
267 ;; the position right after the message receiver, and if you are at
268 ;; (eolp) indent the current line by a constant offset from the
269 ;; opening bracket; otherwise we are looking at the first character
270 ;; of the first method call argument, so lineup the current line
271 ;; with it.
272 (save-excursion
273 (let* ((extra (save-excursion
274 (back-to-indentation)
275 (c-backward-syntactic-ws (cdr langelem))
276 (if (= (preceding-char) ?:)
277 (- c-basic-offset)
278 0)))
279 (open-bracket-pos (cdr langelem))
280 (open-bracket-col (progn
281 (goto-char open-bracket-pos)
282 (current-column)))
283 (target-col (progn
284 (forward-char)
285 (forward-sexp)
286 (skip-chars-forward " \t")
287 (if (eolp)
288 (+ open-bracket-col c-basic-offset)
289 (current-column))))
290 )
291 (- target-col open-bracket-col extra))))
292
293 (defun c-lineup-ObjC-method-args (langelem)
294 ;; Line up the colons that separate args. This is done trying to
295 ;; align colons vertically.
296 (save-excursion
297 (let* ((here (c-point 'boi))
298 (curcol (progn (goto-char here) (current-column)))
299 (eol (c-point 'eol))
300 (relpos (cdr langelem))
301 (first-col-column (progn
302 (goto-char relpos)
303 (skip-chars-forward "^:" eol)
304 (and (= (following-char) ?:)
305 (current-column)))))
306 (if (not first-col-column)
307 c-basic-offset
308 (goto-char here)
309 (skip-chars-forward "^:" eol)
310 (if (= (following-char) ?:)
311 (+ curcol (- first-col-column (current-column)))
312 c-basic-offset)))))
313
314 (defun c-lineup-ObjC-method-args-2 (langelem)
315 ;; Line up the colons that separate args. This is done trying to
316 ;; align the colon on the current line with the previous one.
317 (save-excursion
318 (let* ((here (c-point 'boi))
319 (curcol (progn (goto-char here) (current-column)))
320 (eol (c-point 'eol))
321 (relpos (cdr langelem))
322 (prev-col-column (progn
323 (skip-chars-backward "^:" relpos)
324 (and (= (preceding-char) ?:)
325 (- (current-column) 1)))))
326 (if (not prev-col-column)
327 c-basic-offset
328 (goto-char here)
329 (skip-chars-forward "^:" eol)
330 (if (= (following-char) ?:)
331 (+ curcol (- prev-col-column (current-column)))
332 c-basic-offset)))))
333
334 (defun c-snug-do-while (syntax pos)
335 "Dynamically calculate brace hanginess for do-while statements.
336 Using this function, `while' clauses that end a `do-while' block will
337 remain on the same line as the brace that closes that block.
338
339 See `c-hanging-braces-alist' for how to utilize this function as an
340 ACTION associated with `block-close' syntax."
341 (save-excursion
342 (let (langelem)
343 (if (and (eq syntax 'block-close)
344 (setq langelem (assq 'block-close c-syntactic-context))
345 (progn (goto-char (cdr langelem))
346 (if (= (following-char) ?{)
347 (c-safe (forward-sexp -1)))
348 (looking-at "\\<do\\>[^_]")))
349 '(before)
350 '(before after)))))
351
352 (defun c-gnu-impose-minimum ()
353 "Imposes a minimum indentation for lines inside a top-level construct.
354 The variable `c-label-minimum-indentation' specifies the minimum
355 indentation amount."
356 (let ((non-top-levels '(defun-block-intro statement statement-cont
357 statement-block-intro statement-case-intro
358 statement-case-open substatement substatement-open
359 case-label label do-while-closure else-clause
360 ))
361 (syntax c-syntactic-context)
362 langelem)
363 (while syntax
364 (setq langelem (car (car syntax))
365 syntax (cdr syntax))
366 ;; don't adjust comment-only lines
367 (cond ((eq langelem 'comment-intro)
368 (setq syntax nil))
369 ((memq langelem non-top-levels)
370 (save-excursion
371 (setq syntax nil)
372 (back-to-indentation)
373 (if (zerop (current-column))
374 (insert (make-string c-label-minimum-indentation 32)))
375 ))
376 ))))
377
378
379 ;; Useful for c-hanging-semi&comma-criteria
380 (defun c-semi&comma-inside-parenlist ()
381 "Determine if a newline should be added after a semicolon.
382 If a comma was inserted, no determination is made. If a semicolon was
383 inserted inside a parenthesis list, no newline is added otherwise a
384 newline is added. In either case, checking is stopped. This supports
385 exactly the old newline insertion behavior."
386 ;; newline only after semicolon, but only if that semicolon is not
387 ;; inside a parenthesis list (e.g. a for loop statement)
388 (if (/= last-command-char ?\;)
389 nil ; continue checking
390 (if (condition-case nil
391 (save-excursion
392 (up-list -1)
393 (/= (following-char) ?\())
394 (error t))
395 t
396 'stop)))
397
398
399 (provide 'cc-align)
400 ;;; cc-align.el ends here