1 ;;; cc-engine.el --- core syntax guessing engine for CC mode
3 ;; Copyright (C) 1985, 1987, 1992-2013 Free Software Foundation, Inc.
5 ;; Authors: 2001- Alan Mackenzie
6 ;; 1998- Martin Stjernholm
7 ;; 1992-1999 Barry A. Warsaw
10 ;; 1985 Richard M. Stallman
11 ;; Maintainer: bug-cc-mode@gnu.org
12 ;; Created: 22-Apr-1997 (split from cc-mode.el)
13 ;; Keywords: c languages
16 ;; This file is part of GNU Emacs.
18 ;; GNU Emacs is free software: you can redistribute it and/or modify
19 ;; it under the terms of the GNU General Public License as published by
20 ;; the Free Software Foundation, either version 3 of the License, or
21 ;; (at your option) any later version.
23 ;; GNU Emacs is distributed in the hope that it will be useful,
24 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
25 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
26 ;; GNU General Public License for more details.
28 ;; You should have received a copy of the GNU General Public License
29 ;; along with GNU Emacs. If not, see <http://www.gnu.org/licenses/>.
33 ;; The functions which have docstring documentation can be considered
34 ;; part of an API which other packages can use in CC Mode buffers.
35 ;; Otoh, undocumented functions and functions with the documentation
36 ;; in comments are considered purely internal and can change semantics
37 ;; or even disappear in the future.
39 ;; (This policy applies to CC Mode as a whole, not just this file. It
40 ;; probably also applies to many other Emacs packages, but here it's
41 ;; clearly spelled out.)
43 ;; Hidden buffer changes
45 ;; Various functions in CC Mode use text properties for caching and
46 ;; syntactic markup purposes, and those of them that might modify such
47 ;; properties but still don't modify the buffer in a visible way are
48 ;; said to do "hidden buffer changes". They should be used within
49 ;; `c-save-buffer-state' or a similar function that saves and restores
50 ;; buffer modifiedness, disables buffer change hooks, etc.
52 ;; Interactive functions are assumed to not do hidden buffer changes,
53 ;; except in the specific parts of them that do real changes.
55 ;; Lineup functions are assumed to do hidden buffer changes. They
56 ;; must not do real changes, though.
58 ;; All other functions that do hidden buffer changes have that noted
59 ;; in their doc string or comment.
61 ;; The intention with this system is to avoid wrapping every leaf
62 ;; function that do hidden buffer changes inside
63 ;; `c-save-buffer-state'. It should be used as near the top of the
64 ;; interactive functions as possible.
66 ;; Functions called during font locking are allowed to do hidden
67 ;; buffer changes since the font-lock package run them in a context
68 ;; similar to `c-save-buffer-state' (in fact, that function is heavily
69 ;; inspired by `save-buffer-state' in the font-lock package).
71 ;; Use of text properties
73 ;; CC Mode uses several text properties internally to mark up various
74 ;; positions, e.g. to improve speed and to eliminate glitches in
75 ;; interactive refontification.
77 ;; Note: This doc is for internal use only. Other packages should not
78 ;; assume that these text properties are used as described here.
81 ;; Used for "indirection". With its help, some other property can
82 ;; be cheaply and easily switched on or off everywhere it occurs.
85 ;; Used to modify the syntax of some characters. It is used to
86 ;; mark the "<" and ">" of angle bracket parens with paren syntax, and
87 ;; to "hide" obtrusive characters in preprocessor lines.
89 ;; This property is used on single characters and is therefore
90 ;; always treated as front and rear nonsticky (or start and end open
91 ;; in XEmacs vocabulary). It's therefore installed on
92 ;; `text-property-default-nonsticky' if that variable exists (Emacs
95 ;; 'c-is-sws and 'c-in-sws
96 ;; Used by `c-forward-syntactic-ws' and `c-backward-syntactic-ws' to
97 ;; speed them up. See the comment blurb before `c-put-is-sws'
98 ;; below for further details.
101 ;; This property is used on single characters to mark positions with
102 ;; special syntactic relevance of various sorts. Its primary use is
103 ;; to avoid glitches when multiline constructs are refontified
104 ;; interactively (on font lock decoration level 3). It's cleared in
105 ;; a region before it's fontified and is then put on relevant chars
106 ;; in that region as they are encountered during the fontification.
107 ;; The value specifies the kind of position:
110 ;; Put on the last char of the token preceding each declaration
111 ;; inside a declaration style arglist (typically in a function
115 ;; Put on the last char of the token preceding a declaration.
116 ;; This is used in cases where declaration boundaries can't be
117 ;; recognized simply by looking for a token like ";" or "}".
118 ;; `c-type-decl-end-used' must be set if this is used (see also
119 ;; `c-find-decl-spots').
122 ;; Put on the commas that separate arguments in angle bracket
123 ;; arglists like C++ template arglists.
125 ;; 'c-decl-id-start and 'c-decl-type-start
126 ;; Put on the last char of the token preceding each declarator
127 ;; in the declarator list of a declaration. They are also used
128 ;; between the identifiers cases like enum declarations.
129 ;; 'c-decl-type-start is used when the declarators are types,
130 ;; 'c-decl-id-start otherwise.
133 ;; Used in AWK mode to mark the various kinds of newlines. See
140 (if (and (boundp 'byte-compile-dest-file
)
141 (stringp byte-compile-dest-file
))
142 (cons (file-name-directory byte-compile-dest-file
) load-path
)
144 (load "cc-bytecomp" nil t
)))
146 (cc-require 'cc-defs
)
147 (cc-require-when-compile 'cc-langs
)
148 (cc-require 'cc-vars
)
150 ;; Silence the compiler.
151 (cc-bytecomp-defun buffer-syntactic-context) ; XEmacs
154 ;; Make declarations for all the `c-lang-defvar' variables in cc-langs.
156 (defmacro c-declare-lang-variables
()
159 (mapcar (lambda (init)
161 `(defvar ,(car init
) nil
,(elt init
2))
162 `(defvar ,(car init
) nil
))
163 (make-variable-buffer-local ',(car init
))))
164 (cdr c-lang-variable-inits
)))))
165 (c-declare-lang-variables)
168 ;;; Internal state variables.
170 ;; Internal state of hungry delete key feature
171 (defvar c-hungry-delete-key nil
)
172 (make-variable-buffer-local 'c-hungry-delete-key
)
174 ;; The electric flag (toggled by `c-toggle-electric-state').
175 ;; If t, electric actions (like automatic reindentation, and (if
176 ;; c-auto-newline is also set) auto newlining) will happen when an electric
177 ;; key like `{' is pressed (or an electric keyword like `else').
178 (defvar c-electric-flag t
)
179 (make-variable-buffer-local 'c-electric-flag
)
181 ;; Internal state of auto newline feature.
182 (defvar c-auto-newline nil
)
183 (make-variable-buffer-local 'c-auto-newline
)
185 ;; Included in the mode line to indicate the active submodes.
186 ;; (defvar c-submode-indicators nil)
187 ;; (make-variable-buffer-local 'c-submode-indicators)
189 (defun c-calculate-state (arg prevstate
)
190 ;; Calculate the new state of PREVSTATE, t or nil, based on arg. If
191 ;; arg is nil or zero, toggle the state. If arg is negative, turn
192 ;; the state off, and if arg is positive, turn the state on
194 (zerop (setq arg
(prefix-numeric-value arg
))))
199 ;; Basic handling of preprocessor directives.
201 ;; This is a dynamically bound cache used together with
202 ;; `c-query-macro-start' and `c-query-and-set-macro-start'. It only
203 ;; works as long as point doesn't cross a macro boundary.
204 (defvar c-macro-start
'unknown
)
206 (defsubst c-query-and-set-macro-start
()
207 (if (symbolp c-macro-start
)
208 (setq c-macro-start
(save-excursion
209 (c-save-buffer-state ()
210 (and (c-beginning-of-macro)
214 (defsubst c-query-macro-start
()
215 (if (symbolp c-macro-start
)
217 (c-save-buffer-state ()
218 (and (c-beginning-of-macro)
222 ;; One element macro cache to cope with continual movement within very large
224 (defvar c-macro-cache nil
)
225 (make-variable-buffer-local 'c-macro-cache
)
226 ;; Nil or cons of the bounds of the most recent CPP form probed by
227 ;; `c-beginning-of-macro', `c-end-of-macro' or `c-syntactic-end-of-macro'.
228 ;; The cdr will be nil if we know only the start of the CPP form.
229 (defvar c-macro-cache-start-pos nil
)
230 (make-variable-buffer-local 'c-macro-cache-start-pos
)
231 ;; The starting position from where we determined `c-macro-cache'.
232 (defvar c-macro-cache-syntactic nil
)
233 (make-variable-buffer-local 'c-macro-cache-syntactic
)
234 ;; non-nil iff `c-macro-cache' has both elements set AND the cdr is at a
235 ;; syntactic end of macro, not merely an apparent one.
237 (defun c-invalidate-macro-cache (beg end
)
238 ;; Called from a before-change function. If the change region is before or
239 ;; in the macro characterized by `c-macro-cache' etc., nullify it
240 ;; appropriately. BEG and END are the standard before-change-functions
241 ;; parameters. END isn't used.
243 ((null c-macro-cache
))
244 ((< beg
(car c-macro-cache
))
245 (setq c-macro-cache nil
246 c-macro-cache-start-pos nil
247 c-macro-cache-syntactic nil
))
248 ((and (cdr c-macro-cache
)
249 (< beg
(cdr c-macro-cache
)))
250 (setcdr c-macro-cache nil
)
251 (setq c-macro-cache-start-pos beg
252 c-macro-cache-syntactic nil
))))
254 (defun c-beginning-of-macro (&optional lim
)
255 "Go to the beginning of a preprocessor directive.
256 Leave point at the beginning of the directive and return t if in one,
257 otherwise return nil and leave point unchanged.
259 Note that this function might do hidden buffer changes. See the
260 comment at the start of cc-engine.el for more info."
261 (let ((here (point)))
262 (when c-opt-cpp-prefix
263 (if (and (car c-macro-cache
)
264 (>= (point) (car c-macro-cache
))
265 (or (and (cdr c-macro-cache
)
266 (<= (point) (cdr c-macro-cache
)))
267 (<= (point) c-macro-cache-start-pos
)))
268 (unless (< (car c-macro-cache
) (or lim
(point-min)))
269 (progn (goto-char (max (or lim
(point-min)) (car c-macro-cache
)))
270 (setq c-macro-cache-start-pos
271 (max c-macro-cache-start-pos here
))
273 (setq c-macro-cache nil
274 c-macro-cache-start-pos nil
275 c-macro-cache-syntactic nil
)
278 (if lim
(narrow-to-region lim
(point-max)))
280 (while (eq (char-before (1- (point))) ?
\\)
282 (back-to-indentation)
283 (if (and (<= (point) here
)
284 (looking-at c-opt-cpp-start
))
286 (setq c-macro-cache
(cons (point) nil
)
287 c-macro-cache-start-pos here
)
292 (defun c-end-of-macro ()
293 "Go to the end of a preprocessor directive.
294 More accurately, move the point to the end of the closest following
295 line that doesn't end with a line continuation backslash - no check is
296 done that the point is inside a cpp directive to begin with.
298 Note that this function might do hidden buffer changes. See the
299 comment at the start of cc-engine.el for more info."
300 (if (and (cdr c-macro-cache
)
301 (<= (point) (cdr c-macro-cache
))
302 (>= (point) (car c-macro-cache
)))
303 (goto-char (cdr c-macro-cache
))
304 (unless (and (car c-macro-cache
)
305 (<= (point) c-macro-cache-start-pos
)
306 (>= (point) (car c-macro-cache
)))
307 (setq c-macro-cache nil
308 c-macro-cache-start-pos nil
309 c-macro-cache-syntactic nil
))
312 (when (and (eq (char-before) ?
\\)
316 (when (car c-macro-cache
)
317 (setcdr c-macro-cache
(point)))))
319 (defun c-syntactic-end-of-macro ()
320 ;; Go to the end of a CPP directive, or a "safe" pos just before.
322 ;; This is normally the end of the next non-escaped line. A "safe"
323 ;; position is one not within a string or comment. (The EOL on a line
324 ;; comment is NOT "safe").
326 ;; This function must only be called from the beginning of a CPP construct.
328 ;; Note that this function might do hidden buffer changes. See the comment
329 ;; at the start of cc-engine.el for more info.
330 (let* ((here (point))
331 (there (progn (c-end-of-macro) (point)))
333 (unless c-macro-cache-syntactic
334 (setq s
(parse-partial-sexp here there
))
335 (while (and (or (nth 3 s
) ; in a string
336 (nth 4 s
)) ; in a comment (maybe at end of line comment)
337 (> there here
)) ; No infinite loops, please.
338 (setq there
(1- (nth 8 s
)))
339 (setq s
(parse-partial-sexp here there
)))
340 (setq c-macro-cache-syntactic
(car c-macro-cache
)))
343 (defun c-forward-over-cpp-define-id ()
344 ;; Assuming point is at the "#" that introduces a preprocessor
345 ;; directive, it's moved forward to the end of the identifier which is
346 ;; "#define"d (or whatever c-opt-cpp-macro-define specifies). Non-nil
347 ;; is returned in this case, in all other cases nil is returned and
348 ;; point isn't moved.
350 ;; This function might do hidden buffer changes.
351 (when (and c-opt-cpp-macro-define-id
352 (looking-at c-opt-cpp-macro-define-id
))
353 (goto-char (match-end 0))))
355 (defun c-forward-to-cpp-define-body ()
356 ;; Assuming point is at the "#" that introduces a preprocessor
357 ;; directive, it's moved forward to the start of the definition body
358 ;; if it's a "#define" (or whatever c-opt-cpp-macro-define
359 ;; specifies). Non-nil is returned in this case, in all other cases
360 ;; nil is returned and point isn't moved.
362 ;; This function might do hidden buffer changes.
363 (when (and c-opt-cpp-macro-define-start
364 (looking-at c-opt-cpp-macro-define-start
)
365 (not (= (match-end 0) (c-point 'eol
))))
366 (goto-char (match-end 0))))
369 ;;; Basic utility functions.
371 (defun c-syntactic-content (from to paren-level
)
372 ;; Return the given region as a string where all syntactic
373 ;; whitespace is removed or, where necessary, replaced with a single
374 ;; space. If PAREN-LEVEL is given then all parens in the region are
375 ;; collapsed to "()", "[]" etc.
377 ;; This function might do hidden buffer changes.
381 (narrow-to-region from to
)
383 (let* ((parts (list nil
)) (tail parts
) pos in-paren
)
385 (while (re-search-forward c-syntactic-ws-start to t
)
386 (goto-char (setq pos
(match-beginning 0)))
387 (c-forward-syntactic-ws)
393 (setq in-paren
(= (car (parse-partial-sexp from pos
1)) 1)
396 (if (and (> pos from
)
398 (looking-at "\\w\\|\\s_")
401 (looking-at "\\w\\|\\s_")))
403 (setcdr tail
(list (buffer-substring-no-properties from pos
)
405 (setq tail
(cddr tail
)))
406 (setcdr tail
(list (buffer-substring-no-properties from pos
)))
407 (setq tail
(cdr tail
)))
410 (when (= (car (parse-partial-sexp pos to -
1)) -
1)
411 (setcdr tail
(list (buffer-substring-no-properties
412 (1- (point)) (point))))
413 (setq tail
(cdr tail
))))
415 (setq from
(point))))
417 (setcdr tail
(list (buffer-substring-no-properties from to
)))
418 (apply 'concat
(cdr parts
))))))
420 (defun c-shift-line-indentation (shift-amt)
421 ;; Shift the indentation of the current line with the specified
422 ;; amount (positive inwards). The buffer is modified only if
423 ;; SHIFT-AMT isn't equal to zero.
424 (let ((pos (- (point-max) (point)))
425 (c-macro-start c-macro-start
)
427 (if (zerop shift-amt
)
429 ;; If we're on an empty line inside a macro, we take the point
430 ;; to be at the current indentation and shift it to the
431 ;; appropriate column. This way we don't treat the extra
432 ;; whitespace out to the line continuation as indentation.
433 (when (and (c-query-and-set-macro-start)
434 (looking-at "[ \t]*\\\\$")
436 (skip-chars-backward " \t")
440 (setq tmp-char-inserted t
))
442 (let ((col (current-indentation)))
443 (delete-region (c-point 'bol
) (c-point 'boi
))
445 (indent-to (+ col shift-amt
)))
446 (when tmp-char-inserted
448 ;; If initial point was within line's indentation and we're not on
449 ;; a line with a line continuation in a macro, position after the
450 ;; indentation. Else stay at same point in text.
451 (if (and (< (point) (c-point 'boi
))
452 (not tmp-char-inserted
))
453 (back-to-indentation)
454 (if (> (- (point-max) pos
) (point))
455 (goto-char (- (point-max) pos
))))))
457 (defsubst c-keyword-sym
(keyword)
458 ;; Return non-nil if the string KEYWORD is a known keyword. More
459 ;; precisely, the value is the symbol for the keyword in
460 ;; `c-keywords-obarray'.
461 (intern-soft keyword c-keywords-obarray
))
463 (defsubst c-keyword-member
(keyword-sym lang-constant
)
464 ;; Return non-nil if the symbol KEYWORD-SYM, as returned by
465 ;; `c-keyword-sym', is a member of LANG-CONSTANT, which is the name
466 ;; of a language constant that ends with "-kwds". If KEYWORD-SYM is
467 ;; nil then the result is nil.
468 (get keyword-sym lang-constant
))
470 ;; String syntax chars, suitable for skip-syntax-(forward|backward).
471 (defconst c-string-syntax
(if (memq 'gen-string-delim c-emacs-features
)
475 ;; Regexp matching string limit syntax.
476 (defconst c-string-limit-regexp
(if (memq 'gen-string-delim c-emacs-features
)
480 ;; Regexp matching WS followed by string limit syntax.
481 (defconst c-ws
*-string-limit-regexp
482 (concat "[ \t]*\\(" c-string-limit-regexp
"\\)"))
484 ;; Holds formatted error strings for the few cases where parse errors
486 (defvar c-parsing-error nil
)
487 (make-variable-buffer-local 'c-parsing-error
)
489 (defun c-echo-parsing-error (&optional quiet
)
490 (when (and c-report-syntactic-errors c-parsing-error
(not quiet
))
491 (c-benign-error "%s" c-parsing-error
))
494 ;; Faces given to comments and string literals. This is used in some
495 ;; situations to speed up recognition; it isn't mandatory that font
496 ;; locking is in use. This variable is extended with the face in
497 ;; `c-doc-face-name' when fontification is activated in cc-fonts.el.
498 (defvar c-literal-faces
499 (append '(font-lock-comment-face font-lock-string-face
)
500 (when (facep 'font-lock-comment-delimiter-face
)
502 '(font-lock-comment-delimiter-face))))
504 (defsubst c-put-c-type-property
(pos value
)
505 ;; Put a c-type property with the given value at POS.
506 (c-put-char-property pos
'c-type value
))
508 (defun c-clear-c-type-property (from to value
)
509 ;; Remove all occurrences of the c-type property that has the given
510 ;; value in the region between FROM and TO. VALUE is assumed to not
513 ;; Note: This assumes that c-type is put on single chars only; it's
514 ;; very inefficient if matching properties cover large regions.
518 (when (eq (get-text-property (point) 'c-type
) value
)
519 (c-clear-char-property (point) 'c-type
))
520 (goto-char (next-single-property-change (point) 'c-type nil to
))
524 ;; Some debug tools to visualize various special positions. This
525 ;; debug code isn't as portable as the rest of CC Mode.
527 (cc-bytecomp-defun overlays-in)
528 (cc-bytecomp-defun overlay-get)
529 (cc-bytecomp-defun overlay-start)
530 (cc-bytecomp-defun overlay-end)
531 (cc-bytecomp-defun delete-overlay)
532 (cc-bytecomp-defun overlay-put)
533 (cc-bytecomp-defun make-overlay)
535 (defun c-debug-add-face (beg end face
)
536 (c-save-buffer-state ((overlays (overlays-in beg end
)) overlay
)
538 (setq overlay
(car overlays
)
539 overlays
(cdr overlays
))
540 (when (eq (overlay-get overlay
'face
) face
)
541 (setq beg
(min beg
(overlay-start overlay
))
542 end
(max end
(overlay-end overlay
)))
543 (delete-overlay overlay
)))
544 (overlay-put (make-overlay beg end
) 'face face
)))
546 (defun c-debug-remove-face (beg end face
)
547 (c-save-buffer-state ((overlays (overlays-in beg end
)) overlay
548 (ol-beg beg
) (ol-end end
))
550 (setq overlay
(car overlays
)
551 overlays
(cdr overlays
))
552 (when (eq (overlay-get overlay
'face
) face
)
553 (setq ol-beg
(min ol-beg
(overlay-start overlay
))
554 ol-end
(max ol-end
(overlay-end overlay
)))
555 (delete-overlay overlay
)))
557 (overlay-put (make-overlay ol-beg beg
) 'face face
))
559 (overlay-put (make-overlay end ol-end
) 'face face
))))
562 ;; `c-beginning-of-statement-1' and accompanying stuff.
564 ;; KLUDGE ALERT: c-maybe-labelp is used to pass information between
565 ;; c-crosses-statement-barrier-p and c-beginning-of-statement-1. A
566 ;; better way should be implemented, but this will at least shut up
567 ;; the byte compiler.
568 (defvar c-maybe-labelp
)
570 ;; New awk-compatible version of c-beginning-of-statement-1, ACM 2002/6/22
572 ;; Macros used internally in c-beginning-of-statement-1 for the
573 ;; automaton actions.
574 (defmacro c-bos-push-state
()
575 '(setq stack
(cons (cons state saved-pos
)
577 (defmacro c-bos-pop-state
(&optional do-if-done
)
578 `(if (setq state
(car (car stack
))
579 saved-pos
(cdr (car stack
))
584 (defmacro c-bos-pop-state-and-retry
()
585 '(throw 'loop
(setq state
(car (car stack
))
586 saved-pos
(cdr (car stack
))
587 ;; Throw nil if stack is empty, else throw non-nil.
589 (defmacro c-bos-save-pos
()
590 '(setq saved-pos
(vector pos tok ptok pptok
)))
591 (defmacro c-bos-restore-pos
()
592 '(unless (eq (elt saved-pos
0) start
)
593 (setq pos
(elt saved-pos
0)
594 tok
(elt saved-pos
1)
595 ptok
(elt saved-pos
2)
596 pptok
(elt saved-pos
3))
599 (defmacro c-bos-save-error-info
(missing got
)
600 `(setq saved-pos
(vector pos
,missing
,got
)))
601 (defmacro c-bos-report-error
()
603 (setq c-parsing-error
604 (format "No matching `%s' found for `%s' on line %d"
607 (1+ (count-lines (point-min)
608 (c-point 'bol
(elt saved-pos
0))))))))
610 (defun c-beginning-of-statement-1 (&optional lim ignore-labels
612 "Move to the start of the current statement or declaration, or to
613 the previous one if already at the beginning of one. Only
614 statements/declarations on the same level are considered, i.e. don't
615 move into or out of sexps (not even normal expression parentheses).
617 If point is already at the earliest statement within braces or parens,
618 this function doesn't move back into any whitespace preceding it; it
619 returns 'same in this case.
621 Stop at statement continuation tokens like \"else\", \"catch\",
622 \"finally\" and the \"while\" in \"do ... while\" if the start point
623 is within the continuation. If starting at such a token, move to the
624 corresponding statement start. If at the beginning of a statement,
625 move to the closest containing statement if there is any. This might
626 also stop at a continuation clause.
628 Labels are treated as part of the following statements if
629 IGNORE-LABELS is non-nil. (FIXME: Doesn't work if we stop at a known
630 statement start keyword.) Otherwise, each label is treated as a
633 Macros are ignored \(i.e. skipped over) unless point is within one, in
634 which case the content of the macro is treated as normal code. Aside
635 from any normal statement starts found in it, stop at the first token
636 of the content in the macro, i.e. the expression of an \"#if\" or the
637 start of the definition in a \"#define\". Also stop at start of
638 macros before leaving them.
641 'label if stopped at a label or \"case...:\" or \"default:\";
642 'same if stopped at the beginning of the current statement;
643 'up if stepped to a containing statement;
644 'previous if stepped to a preceding statement;
645 'beginning if stepped from a statement continuation clause to
647 'macro if stepped to a macro start.
648 Note that 'same and not 'label is returned if stopped at the same
649 label without crossing the colon character.
651 LIM may be given to limit the search. If the search hits the limit,
652 point will be left at the closest following token, or at the start
653 position if that is less ('same is returned in this case).
655 NOERROR turns off error logging to `c-parsing-error'.
657 Normally only ';' and virtual semicolons are considered to delimit
658 statements, but if COMMA-DELIM is non-nil then ',' is treated
661 Note that this function might do hidden buffer changes. See the
662 comment at the start of cc-engine.el for more info."
664 ;; The bulk of this function is a pushdown automaton that looks at statement
665 ;; boundaries and the tokens (such as "while") in c-opt-block-stmt-key. Its
666 ;; purpose is to keep track of nested statements, ensuring that such
667 ;; statements are skipped over in their entirety (somewhat akin to what C-M-p
668 ;; does with nested braces/brackets/parentheses).
670 ;; Note: The position of a boundary is the following token.
672 ;; Beginning with the current token (the one following point), move back one
673 ;; sexp at a time (where a sexp is, more or less, either a token or the
674 ;; entire contents of a brace/bracket/paren pair). Each time a statement
675 ;; boundary is crossed or a "while"-like token is found, update the state of
676 ;; the PDA. Stop at the beginning of a statement when the stack (holding
677 ;; nested statement info) is empty and the position has been moved.
679 ;; The following variables constitute the PDA:
681 ;; sym: This is either the "while"-like token (e.g. 'for) we've just
682 ;; scanned back over, 'boundary if we've just gone back over a
683 ;; statement boundary, or nil otherwise.
684 ;; state: takes one of the values (nil else else-boundary while
685 ;; while-boundary catch catch-boundary).
686 ;; nil means "no "while"-like token yet scanned".
687 ;; 'else, for example, means "just gone back over an else".
688 ;; 'else-boundary means "just gone back over a statement boundary
689 ;; immediately after having gone back over an else".
690 ;; saved-pos: A vector of either saved positions (tok ptok pptok, etc.) or
691 ;; of error reporting information.
692 ;; stack: The stack onto which the PDA pushes its state. Each entry
693 ;; consists of a saved value of state and saved-pos. An entry is
694 ;; pushed when we move back over a "continuation" token (e.g. else)
695 ;; and popped when we encounter the corresponding opening token
699 ;; The following diagram briefly outlines the PDA.
702 ;; "else": Push state, goto state `else'.
703 ;; "while": Push state, goto state `while'.
704 ;; "catch" or "finally": Push state, goto state `catch'.
705 ;; boundary: Pop state.
706 ;; other: Do nothing special.
709 ;; boundary: Goto state `else-boundary'.
710 ;; other: Error, pop state, retry token.
712 ;; State `else-boundary':
714 ;; boundary: Error, pop state.
715 ;; other: See common state.
718 ;; boundary: Save position, goto state `while-boundary'.
719 ;; other: Pop state, retry token.
721 ;; State `while-boundary':
723 ;; boundary: Restore position if it's not at start, pop state. [*see below]
724 ;; other: See common state.
727 ;; boundary: Goto state `catch-boundary'.
728 ;; other: Error, pop state, retry token.
730 ;; State `catch-boundary':
732 ;; "catch": Goto state `catch'.
733 ;; boundary: Error, pop state.
734 ;; other: See common state.
736 ;; [*] In the `while-boundary' state, we had pushed a 'while state, and were
737 ;; searching for a "do" which would have opened a do-while. If we didn't
738 ;; find it, we discard the analysis done since the "while", go back to this
739 ;; token in the buffer and restart the scanning there, this time WITHOUT
740 ;; pushing the 'while state onto the stack.
742 ;; In addition to the above there is some special handling of labels
745 (let ((case-fold-search nil
)
748 (delims (if comma-delim
'(?\
; ?,) '(?\;)))
749 (c-stmt-delim-chars (if comma-delim
750 c-stmt-delim-chars-with-comma
752 c-in-literal-cache c-maybe-labelp after-case
:-pos saved
755 ;; Position of last stmt boundary character (e.g. ;).
757 ;; The position of the last sexp or bound that follows the
758 ;; first found colon, i.e. the start of the nonlabel part of
759 ;; the statement. It's `start' if a colon is found just after
762 ;; Like `after-labels-pos', but the first such position inside
763 ;; a label, i.e. the start of the last label before the start
764 ;; of the nonlabel part of the statement.
766 ;; The last position where a label is possible provided the
767 ;; statement started there. It's nil as long as no invalid
768 ;; label content has been found (according to
769 ;; `c-nonlabel-token-key'). It's `start' if no valid label
770 ;; content was found in the label. Note that we might still
771 ;; regard it a label if it starts with `c-label-kwds'.
773 ;; Putative positions of the components of a bitfield declaration,
774 ;; e.g. "int foo : NUM_FOO_BITS ;"
775 bitfield-type-pos bitfield-id-pos bitfield-size-pos
776 ;; Symbol just scanned back over (e.g. 'while or 'boundary).
779 ;; Current state in the automaton. See above.
781 ;; Current saved positions. See above.
783 ;; Stack of conses (state . saved-pos).
785 ;; Regexp which matches "for", "if", etc.
786 (cond-key (or c-opt-block-stmt-key
787 "\\<\\>")) ; Matches nothing.
790 ;; Positions of the last three sexps or bounds we've stopped at.
794 (if lim
(narrow-to-region lim
(point-max)))
797 (and (c-beginning-of-macro)
799 (setq macro-start
(point)))
801 ;; Try to skip back over unary operator characters, to register
805 (c-backward-syntactic-ws)
806 ;; Protect post-++/-- operators just before a virtual semicolon.
807 (and (not (c-at-vsemi-p))
808 (/= (skip-chars-backward "-+!*&~@`#") 0))))
810 ;; Skip back over any semicolon here. If it was a bare semicolon, we're
811 ;; done. Later on we ignore the boundaries for statements that don't
812 ;; contain any sexp. The only thing that is affected is that the error
813 ;; checking is a little less strict, and we really don't bother.
814 (if (and (memq (char-before) delims
)
815 (progn (forward-char -
1)
817 (c-backward-syntactic-ws)
818 (or (memq (char-before) delims
)
819 (memq (char-before) '(?
: nil
))
820 (eq (char-syntax (char-before)) ?\
()
825 ;; Begin at start and not pos to detect macros if we stand
826 ;; directly after the #.
828 (if (looking-at "\\<\\|\\W")
829 ;; Record this as the first token if not starting inside it.
833 ;; The following while loop goes back one sexp (balanced parens,
834 ;; etc. with contents, or symbol or suchlike) each iteration. This
835 ;; movement is accomplished with a call to c-backward-sexp approx 170
838 ;; The loop is exited only by throwing nil to the (catch 'loop ...):
839 ;; 1. On reaching the start of a macro;
840 ;; 2. On having passed a stmt boundary with the PDA stack empty;
841 ;; 3. On reaching the start of an Objective C method def;
842 ;; 4. From macro `c-bos-pop-state'; when the stack is empty;
843 ;; 5. From macro `c-bos-pop-state-and-retry' when the stack is empty.
845 (catch 'loop
;; Throw nil to break, non-nil to continue.
847 ;; Are we in a macro, just after the opening #?
849 (and macro-start
; Always NIL for AWK.
850 (progn (skip-chars-backward " \t")
851 (eq (char-before) ?
#))
852 (progn (setq saved
(1- (point)))
854 (not (eq (char-before (1- (point))) ?
\\)))
855 (looking-at c-opt-cpp-start
)
856 (progn (skip-chars-forward " \t")
857 (eq (point) saved
))))
859 (if (and (c-forward-to-cpp-define-body)
860 (progn (c-forward-syntactic-ws start
)
862 ;; Stop at the first token in the content of the macro.
864 ignore-labels t
) ; Avoid the label check on exit.
868 (throw 'loop nil
)) ; 1. Start of macro.
870 ;; Do a round through the automaton if we've just passed a
871 ;; statement boundary or passed a "while"-like token.
873 (and (looking-at cond-key
)
874 (setq sym
(intern (match-string 1)))))
876 (when (and (< pos start
) (null stack
))
877 (throw 'loop nil
)) ; 2. Statement boundary.
879 ;; The PDA state handling.
881 ;; Refer to the description of the PDA in the opening
882 ;; comments. In the following OR form, the first leaf
883 ;; attempts to handles one of the specific actions detailed
884 ;; (e.g., finding token "if" whilst in state `else-boundary').
885 ;; We drop through to the second leaf (which handles common
886 ;; state) if no specific handler is found in the first cond.
887 ;; If a parsing error is detected (e.g. an "else" with no
888 ;; preceding "if"), we throw to the enclosing catch.
890 ;; Note that the (eq state 'else) means
891 ;; "we've just passed an else", NOT "we're looking for an
895 (if (eq sym
'boundary
)
896 (setq state
'else-boundary
)
898 (c-bos-pop-state-and-retry)))
900 ((eq state
'else-boundary
)
902 (c-bos-pop-state (setq ret
'beginning
)))
908 (if (and (eq sym
'boundary
)
909 ;; Since this can cause backtracking we do a
910 ;; little more careful analysis to avoid it:
911 ;; If there's a label in front of the while
912 ;; it can't be part of a do-while.
913 (not after-labels-pos
))
914 (progn (c-bos-save-pos)
915 (setq state
'while-boundary
))
916 (c-bos-pop-state-and-retry))) ; Can't be a do-while
918 ((eq state
'while-boundary
)
920 (c-bos-pop-state (setq ret
'beginning
)))
921 ((eq sym
'boundary
) ; isn't a do-while
922 (c-bos-restore-pos) ; the position of the while
923 (c-bos-pop-state)))) ; no longer searching for do.
926 (if (eq sym
'boundary
)
927 (setq state
'catch-boundary
)
929 (c-bos-pop-state-and-retry)))
931 ((eq state
'catch-boundary
)
934 (c-bos-pop-state (setq ret
'beginning
)))
939 (c-bos-pop-state)))))
941 ;; This is state common. We get here when the previous
942 ;; cond statement found no particular state handler.
943 (cond ((eq sym
'boundary
)
944 ;; If we have a boundary at the start
945 ;; position we push a frame to go to the
946 ;; previous statement.
952 (c-bos-save-error-info 'if
'else
)
955 ;; Is this a real while, or a do-while?
956 ;; The next `when' triggers unless we are SURE that
957 ;; the `while' is not the tail end of a `do-while'.
958 (when (or (not pptok
)
959 (memq (char-after pptok
) delims
)
960 ;; The following kludge is to prevent
961 ;; infinite recursion when called from
962 ;; c-awk-after-if-for-while-condition-p,
964 (and (eq (point) start
)
965 (c-vsemi-status-unknown-p))
966 (c-at-vsemi-p pptok
))
967 ;; Since this can cause backtracking we do a
968 ;; little more careful analysis to avoid it: If
969 ;; the while isn't followed by a (possibly
970 ;; virtual) semicolon it can't be a do-while.
972 (setq state
'while
)))
973 ((memq sym
'(catch finally
))
975 (c-bos-save-error-info 'try sym
)
976 (setq state
'catch
))))
979 ;; We're either past a statement boundary or at the
980 ;; start of a statement, so throw away any label data
981 ;; for the previous one.
982 (setq after-labels-pos nil
984 c-maybe-labelp nil
))))
986 ;; Step to the previous sexp, but not if we crossed a
987 ;; boundary, since that doesn't consume an sexp.
988 (if (eq sym
'boundary
)
991 ;; HERE IS THE SINGLE PLACE INSIDE THE PDA LOOP WHERE WE MOVE
992 ;; BACKWARDS THROUGH THE SOURCE.
994 (c-backward-syntactic-ws)
995 (let ((before-sws-pos (point))
996 ;; The end position of the area to search for statement
997 ;; barriers in this round.
998 (maybe-after-boundary-pos pos
))
1000 ;; Go back over exactly one logical sexp, taking proper
1001 ;; account of macros and escaped EOLs.
1004 (unless (c-safe (c-backward-sexp) t
)
1005 ;; Give up if we hit an unbalanced block. Since the
1006 ;; stack won't be empty the code below will report a
1010 ;; Have we moved into a macro?
1011 ((and (not macro-start
)
1012 (c-beginning-of-macro))
1013 ;; Have we crossed a statement boundary? If not,
1014 ;; keep going back until we find one or a "real" sexp.
1018 (not (c-crosses-statement-barrier-p
1019 (point) maybe-after-boundary-pos
)))
1020 (setq maybe-after-boundary-pos
(point))))
1021 ;; Have we just gone back over an escaped NL? This
1022 ;; doesn't count as a sexp.
1023 ((looking-at "\\\\$")))))
1025 ;; Have we crossed a statement boundary?
1028 ;; Are we at a macro beginning?
1029 ((and (not macro-start
)
1031 (looking-at c-opt-cpp-prefix
))
1034 (c-crosses-statement-barrier-p
1035 (point) maybe-after-boundary-pos
)))
1036 ;; Just gone back over a brace block?
1038 (eq (char-after) ?
{)
1039 (not (c-looking-at-inexpr-block lim nil t
)))
1041 (c-forward-sexp) (point)))
1042 ;; Just gone back over some paren block?
1043 ((looking-at "\\s\(")
1045 (goto-char (1+ (c-down-list-backward
1047 (c-crosses-statement-barrier-p
1048 (point) maybe-after-boundary-pos
)))
1049 ;; Just gone back over an ordinary symbol of some sort?
1050 (t (c-crosses-statement-barrier-p
1051 (point) maybe-after-boundary-pos
))))
1058 ;; Like a C "continue". Analyze the next sexp.
1062 (when (and c-opt-method-key
1063 (setq saved
(c-in-method-def-p)))
1065 ignore-labels t
) ; Avoid the label check on exit.
1066 (throw 'loop nil
)) ; 3. ObjC method def.
1068 ;; Might we have a bitfield declaration, "<type> <id> : <size>"?
1071 ;; The : <size> and <id> fields?
1072 ((and (numberp c-maybe-labelp
)
1073 (not bitfield-size-pos
)
1075 (goto-char (or tok start
))
1076 (not (looking-at c-keywords-regexp
)))
1077 (not (looking-at c-keywords-regexp
))
1078 (not (c-punctuation-in (point) c-maybe-labelp
)))
1079 (setq bitfield-size-pos
(or tok start
)
1080 bitfield-id-pos
(point)))
1081 ;; The <type> field?
1082 ((and bitfield-id-pos
1083 (not bitfield-type-pos
))
1084 (if (and (looking-at c-symbol-key
) ; Can only be an integer type. :-)
1085 (not (looking-at c-not-primitive-type-keywords-regexp
))
1086 (not (c-punctuation-in (point) tok
)))
1087 (setq bitfield-type-pos
(point))
1088 (setq bitfield-size-pos nil
1089 bitfield-id-pos nil
)))))
1092 (unless (eq ignore-labels t
)
1093 (when (numberp c-maybe-labelp
)
1094 ;; `c-crosses-statement-barrier-p' has found a colon, so we
1095 ;; might be in a label now. Have we got a real label
1096 ;; (including a case label) or something like C++'s "public:"?
1097 ;; A case label might use an expression rather than a token.
1098 (setq after-case
:-pos
(or tok start
))
1099 (if (or (looking-at c-nonlabel-token-key
) ; e.g. "while" or "'a'"
1100 ;; Catch C++'s inheritance construct "class foo : bar".
1103 (c-safe (c-backward-sexp) t
)
1104 (looking-at c-nonlabel-token-2-key
))))
1105 (setq c-maybe-labelp nil
)
1106 (if after-labels-pos
; Have we already encountered a label?
1107 (if (not last-label-pos
)
1108 (setq last-label-pos
(or tok start
)))
1109 (setq after-labels-pos
(or tok start
)))
1110 (setq c-maybe-labelp t
1111 label-good-pos nil
))) ; bogus "label"
1113 (when (and (not label-good-pos
) ; i.e. no invalid "label"'s yet
1115 (looking-at c-nonlabel-token-key
)) ; e.g. "while :"
1116 ;; We're in a potential label and it's the first
1117 ;; time we've found something that isn't allowed in
1119 (setq label-good-pos
(or tok start
))))
1121 ;; We've moved back by a sexp, so update the token positions.
1126 pos tok
) ; always non-nil
1127 ) ; end of (catch loop ....)
1128 ) ; end of sexp-at-a-time (while ....)
1130 ;; If the stack isn't empty there might be errors to report.
1132 (if (and (vectorp saved-pos
) (eq (length saved-pos
) 3))
1133 (c-bos-report-error))
1134 (setq saved-pos
(cdr (car stack
))
1137 (when (and (eq ret
'same
)
1138 (not (memq sym
'(boundary ignore nil
))))
1139 ;; Need to investigate closer whether we've crossed
1140 ;; between a substatement and its containing statement.
1141 (if (setq saved
(if (looking-at c-block-stmt-1-key
)
1144 (cond ((> start saved
) (setq pos saved
))
1145 ((= start saved
) (setq ret
'up
)))))
1147 (when (and (not ignore-labels
)
1148 (eq c-maybe-labelp t
)
1149 (not (eq ret
'beginning
))
1151 (not bitfield-type-pos
) ; Bitfields take precedence over labels.
1152 (or (not label-good-pos
)
1153 (<= label-good-pos pos
)
1155 (goto-char (if (and last-label-pos
1156 (< last-label-pos start
))
1159 (looking-at c-label-kwds-regexp
))))
1160 ;; We're in a label. Maybe we should step to the statement
1162 (if (< after-labels-pos start
)
1163 (setq pos after-labels-pos
)
1165 (if (and last-label-pos
(< last-label-pos start
))
1166 ;; Might have jumped over several labels. Go to the last one.
1167 (setq pos last-label-pos
)))))
1169 ;; Have we got "case <expression>:"?
1171 (when (and after-case
:-pos
1172 (not (eq ret
'beginning
))
1173 (looking-at c-case-kwds-regexp
))
1174 (if (< after-case
:-pos start
)
1175 (setq pos after-case
:-pos
))
1179 ;; Skip over the unary operators that can start the statement.
1181 (c-backward-syntactic-ws)
1182 ;; protect AWK post-inc/decrement operators, etc.
1183 (and (not (c-at-vsemi-p (point)))
1184 (/= (skip-chars-backward "-+!*&~@`#") 0)))
1189 (defun c-punctuation-in (from to
)
1190 "Return non-nil if there is a non-comment non-macro punctuation character
1191 between FROM and TO. FROM must not be in a string or comment. The returned
1192 value is the position of the first such character."
1195 (let ((pos (point)))
1196 (while (progn (skip-chars-forward c-symbol-chars to
)
1197 (c-forward-syntactic-ws to
)
1199 (setq pos
(point))))
1200 (and (< (point) to
) (point))))
1202 (defun c-crosses-statement-barrier-p (from to
)
1203 "Return non-nil if buffer positions FROM to TO cross one or more
1204 statement or declaration boundaries. The returned value is actually
1205 the position of the earliest boundary char. FROM must not be within
1206 a string or comment.
1208 The variable `c-maybe-labelp' is set to the position of the first `:' that
1209 might start a label (i.e. not part of `::' and not preceded by `?'). If a
1210 single `?' is found, then `c-maybe-labelp' is cleared.
1212 For AWK, a statement which is terminated by an EOL (not a \; or a }) is
1213 regarded as having a \"virtual semicolon\" immediately after the last token on
1214 the line. If this virtual semicolon is _at_ from, the function recognizes it.
1216 Note that this function might do hidden buffer changes. See the
1217 comment at the start of cc-engine.el for more info."
1219 ;; If the current language has CPP macros, insert # into skip-chars.
1220 (if c-opt-cpp-symbol
1221 (concat (substring c-stmt-delim-chars
0 1) ; "^"
1222 c-opt-cpp-symbol
; usually "#"
1223 (substring c-stmt-delim-chars
1)) ; e.g. ";{}?:"
1224 c-stmt-delim-chars
))
1226 (append (substring skip-chars
1) nil
)) ; e.g. (?# ?\; ?{ ?} ?? ?:)
1227 lit-range vsemi-pos
)
1233 (while (progn (skip-chars-forward
1235 (min to
(c-point 'bonl
)))
1238 ;; Virtual semicolon?
1242 (if (setq lit-range
(c-literal-limits from
)) ; Have we landed in a string/comment?
1243 (goto-char (car lit-range
)))
1244 (c-backward-syntactic-ws) ; ? put a limit here, maybe?
1245 (setq vsemi-pos
(point))
1247 (throw 'done vsemi-pos
))
1248 ;; In a string/comment?
1249 ((setq lit-range
(c-literal-limits from
))
1250 (goto-char (cdr lit-range
)))
1251 ((eq (char-after) ?
:)
1253 (if (and (eq (char-after) ?
:)
1255 ;; Ignore scope operators.
1257 (setq c-maybe-labelp
(1- (point)))))
1258 ((eq (char-after) ??
)
1259 ;; A question mark. Can't be a label, so stop
1260 ;; looking for more : and ?.
1261 (setq c-maybe-labelp nil
1262 skip-chars
(substring c-stmt-delim-chars
0 -
2)))
1263 ;; At a CPP construct?
1264 ((and c-opt-cpp-symbol
(looking-at c-opt-cpp-symbol
)
1267 (looking-at c-opt-cpp-prefix
)))
1269 ((memq (char-after) non-skip-list
)
1270 (throw 'done
(point)))))
1271 ;; In trailing space after an as yet undetected virtual semicolon?
1272 (c-backward-syntactic-ws from
)
1273 (if (and (< (point) to
)
1278 (defun c-at-statement-start-p ()
1279 "Return non-nil if the point is at the first token in a statement
1280 or somewhere in the syntactic whitespace before it.
1282 A \"statement\" here is not restricted to those inside code blocks.
1283 Any kind of declaration-like construct that occur outside function
1284 bodies is also considered a \"statement\".
1286 Note that this function might do hidden buffer changes. See the
1287 comment at the start of cc-engine.el for more info."
1292 (c-syntactic-skip-backward (substring c-stmt-delim-chars
1) nil t
)
1294 (eq (char-before) ?
})
1295 (and (eq (char-before) ?
{)
1296 (not (and c-special-brace-lists
1297 (progn (backward-char)
1298 (c-looking-at-special-brace-list)))))
1299 (c-crosses-statement-barrier-p (point) end
)))))
1301 (defun c-at-expression-start-p ()
1302 "Return non-nil if the point is at the first token in an expression or
1303 statement, or somewhere in the syntactic whitespace before it.
1305 An \"expression\" here is a bit different from the normal language
1306 grammar sense: It's any sequence of expression tokens except commas,
1307 unless they are enclosed inside parentheses of some kind. Also, an
1308 expression never continues past an enclosing parenthesis, but it might
1309 contain parenthesis pairs of any sort except braces.
1311 Since expressions never cross statement boundaries, this function also
1312 recognizes statement beginnings, just like `c-at-statement-start-p'.
1314 Note that this function might do hidden buffer changes. See the
1315 comment at the start of cc-engine.el for more info."
1319 (c-stmt-delim-chars c-stmt-delim-chars-with-comma
)
1321 (c-syntactic-skip-backward (substring c-stmt-delim-chars
1) nil t
)
1323 (memq (char-before) '(?
{ ?
}))
1324 (save-excursion (backward-char)
1325 (looking-at "\\s("))
1326 (c-crosses-statement-barrier-p (point) end
)))))
1329 ;; A set of functions that covers various idiosyncrasies in
1330 ;; implementations of `forward-comment'.
1332 ;; Note: Some emacsen considers incorrectly that any line comment
1333 ;; ending with a backslash continues to the next line. I can't think
1334 ;; of any way to work around that in a reliable way without changing
1335 ;; the buffer, though. Suggestions welcome. ;) (No, temporarily
1336 ;; changing the syntax for backslash doesn't work since we must treat
1337 ;; escapes in string literals correctly.)
1339 (defun c-forward-single-comment ()
1340 "Move forward past whitespace and the closest following comment, if any.
1341 Return t if a comment was found, nil otherwise. In either case, the
1342 point is moved past the following whitespace. Line continuations,
1343 i.e. a backslashes followed by line breaks, are treated as whitespace.
1344 The line breaks that end line comments are considered to be the
1345 comment enders, so the point will be put on the beginning of the next
1346 line if it moved past a line comment.
1348 This function does not do any hidden buffer changes."
1350 (let ((start (point)))
1351 (when (looking-at "\\([ \t\n\r\f\v]\\|\\\\[\n\r]\\)+")
1352 (goto-char (match-end 0)))
1354 (when (forward-comment 1)
1356 ;; Some emacsen (e.g. XEmacs 21) return t when moving
1360 ;; Emacs includes the ending newline in a b-style (c++)
1361 ;; comment, but XEmacs doesn't. We depend on the Emacs
1362 ;; behavior (which also is symmetric).
1363 (if (and (eolp) (elt (parse-partial-sexp start
(point)) 7))
1364 (condition-case nil
(forward-char 1)))
1368 (defsubst c-forward-comments
()
1369 "Move forward past all following whitespace and comments.
1370 Line continuations, i.e. a backslashes followed by line breaks, are
1371 treated as whitespace.
1373 Note that this function might do hidden buffer changes. See the
1374 comment at the start of cc-engine.el for more info."
1377 ;; If forward-comment in at least XEmacs 21 is given a large
1378 ;; positive value, it'll loop all the way through if it hits
1380 (and (forward-comment 5)
1381 ;; Some emacsen (e.g. XEmacs 21) return t when moving
1385 (when (looking-at "\\\\[\n\r]")
1389 (defun c-backward-single-comment ()
1390 "Move backward past whitespace and the closest preceding comment, if any.
1391 Return t if a comment was found, nil otherwise. In either case, the
1392 point is moved past the preceding whitespace. Line continuations,
1393 i.e. a backslashes followed by line breaks, are treated as whitespace.
1394 The line breaks that end line comments are considered to be the
1395 comment enders, so the point cannot be at the end of the same line to
1396 move over a line comment.
1398 This function does not do any hidden buffer changes."
1400 (let ((start (point)))
1401 ;; When we got newline terminated comments, forward-comment in all
1402 ;; supported emacsen so far will stop at eol of each line not
1403 ;; ending with a comment when moving backwards. This corrects for
1404 ;; that, and at the same time handles line continuations.
1406 (skip-chars-backward " \t\n\r\f\v")
1407 (and (looking-at "[\n\r]")
1408 (eq (char-before) ?
\\)))
1412 ;; Some emacsen (e.g. Emacs 19.34) return t when moving
1413 ;; backwards at bob.
1416 ;; Leave point after the closest following newline if we've
1417 ;; backed up over any above, since forward-comment won't move
1418 ;; backward over a line comment if point is at the end of the
1420 (re-search-forward "\\=\\s *[\n\r]" start t
)
1422 (if (if (let (open-paren-in-column-0-is-defun-start) (forward-comment -
1))
1424 ;; If forward-comment above succeeded and we're at eol
1425 ;; then the newline we moved over above didn't end a
1426 ;; line comment, so we give it another go.
1427 (let (open-paren-in-column-0-is-defun-start)
1428 (forward-comment -
1))
1431 ;; Emacs <= 20 and XEmacs move back over the closer of a
1432 ;; block comment that lacks an opener.
1433 (if (looking-at "\\*/")
1434 (progn (forward-char 2) nil
)
1437 (defsubst c-backward-comments
()
1438 "Move backward past all preceding whitespace and comments.
1439 Line continuations, i.e. a backslashes followed by line breaks, are
1440 treated as whitespace. The line breaks that end line comments are
1441 considered to be the comment enders, so the point cannot be at the end
1442 of the same line to move over a line comment. Unlike
1443 c-backward-syntactic-ws, this function doesn't move back over
1444 preprocessor directives.
1446 Note that this function might do hidden buffer changes. See the
1447 comment at the start of cc-engine.el for more info."
1449 (let ((start (point)))
1451 ;; `forward-comment' in some emacsen (e.g. XEmacs 21.4)
1452 ;; return t when moving backwards at bob.
1455 (if (let (open-paren-in-column-0-is-defun-start moved-comment
)
1457 (and (not (setq moved-comment
(forward-comment -
1)))
1458 ;; Cope specifically with ^M^J here -
1459 ;; forward-comment sometimes gets stuck after ^Ms,
1460 ;; sometimes after ^M^J.
1462 (when (eq (char-before) ?
\r)
1465 (when (and (eq (char-before) ?
\n)
1466 (eq (char-before (1- (point))) ?
\r))
1470 (if (looking-at "\\*/")
1471 ;; Emacs <= 20 and XEmacs move back over the
1472 ;; closer of a block comment that lacks an opener.
1473 (progn (forward-char 2) nil
)
1476 ;; XEmacs treats line continuations as whitespace but
1477 ;; only in the backward direction, which seems a bit
1478 ;; odd. Anyway, this is necessary for Emacs.
1479 (when (and (looking-at "[\n\r]")
1480 (eq (char-before) ?
\\)
1486 ;; Tools for skipping over syntactic whitespace.
1488 ;; The following functions use text properties to cache searches over
1489 ;; large regions of syntactic whitespace. It works as follows:
1491 ;; o If a syntactic whitespace region contains anything but simple
1492 ;; whitespace (i.e. space, tab and line breaks), the text property
1493 ;; `c-in-sws' is put over it. At places where we have stopped
1494 ;; within that region there's also a `c-is-sws' text property.
1495 ;; That since there typically are nested whitespace inside that
1496 ;; must be handled separately, e.g. whitespace inside a comment or
1497 ;; cpp directive. Thus, from one point with `c-is-sws' it's safe
1498 ;; to jump to another point with that property within the same
1499 ;; `c-in-sws' region. It can be likened to a ladder where
1500 ;; `c-in-sws' marks the bars and `c-is-sws' the rungs.
1502 ;; o The `c-is-sws' property is put on the simple whitespace chars at
1503 ;; a "rung position" and also maybe on the first following char.
1504 ;; As many characters as can be conveniently found in this range
1505 ;; are marked, but no assumption can be made that the whole range
1506 ;; is marked (it could be clobbered by later changes, for
1509 ;; Note that some part of the beginning of a sequence of simple
1510 ;; whitespace might be part of the end of a preceding line comment
1511 ;; or cpp directive and must not be considered part of the "rung".
1512 ;; Such whitespace is some amount of horizontal whitespace followed
1513 ;; by a newline. In the case of cpp directives it could also be
1514 ;; two newlines with horizontal whitespace between them.
1516 ;; The reason to include the first following char is to cope with
1517 ;; "rung positions" that doesn't have any ordinary whitespace. If
1518 ;; `c-is-sws' is put on a token character it does not have
1519 ;; `c-in-sws' set simultaneously. That's the only case when that
1520 ;; can occur, and the reason for not extending the `c-in-sws'
1521 ;; region to cover it is that the `c-in-sws' region could then be
1522 ;; accidentally merged with a following one if the token is only
1523 ;; one character long.
1525 ;; o On buffer changes the `c-in-sws' and `c-is-sws' properties are
1526 ;; removed in the changed region. If the change was inside
1527 ;; syntactic whitespace that means that the "ladder" is broken, but
1528 ;; a later call to `c-forward-sws' or `c-backward-sws' will use the
1529 ;; parts on either side and use an ordinary search only to "repair"
1532 ;; Special care needs to be taken if a region is removed: If there
1533 ;; are `c-in-sws' on both sides of it which do not connect inside
1534 ;; the region then they can't be joined. If e.g. a marked macro is
1535 ;; broken, syntactic whitespace inside the new text might be
1536 ;; marked. If those marks would become connected with the old
1537 ;; `c-in-sws' range around the macro then we could get a ladder
1538 ;; with one end outside the macro and the other at some whitespace
1541 ;; The main motivation for this system is to increase the speed in
1542 ;; skipping over the large whitespace regions that can occur at the
1543 ;; top level in e.g. header files that contain a lot of comments and
1544 ;; cpp directives. For small comments inside code it's probably
1545 ;; slower than using `forward-comment' straightforwardly, but speed is
1546 ;; not a significant factor there anyway.
1548 ; (defface c-debug-is-sws-face
1549 ; '((t (:background "GreenYellow")))
1550 ; "Debug face to mark the `c-is-sws' property.")
1551 ; (defface c-debug-in-sws-face
1552 ; '((t (:underline t)))
1553 ; "Debug face to mark the `c-in-sws' property.")
1555 ; (defun c-debug-put-sws-faces ()
1556 ; ;; Put the sws debug faces on all the `c-is-sws' and `c-in-sws'
1557 ; ;; properties in the buffer.
1560 ; (c-save-buffer-state (in-face)
1561 ; (goto-char (point-min))
1562 ; (setq in-face (if (get-text-property (point) 'c-is-sws)
1565 ; (goto-char (next-single-property-change
1566 ; (point) 'c-is-sws nil (point-max)))
1569 ; (c-debug-add-face in-face (point) 'c-debug-is-sws-face)
1570 ; (setq in-face nil))
1571 ; (setq in-face (point)))
1573 ; (goto-char (point-min))
1574 ; (setq in-face (if (get-text-property (point) 'c-in-sws)
1577 ; (goto-char (next-single-property-change
1578 ; (point) 'c-in-sws nil (point-max)))
1581 ; (c-debug-add-face in-face (point) 'c-debug-in-sws-face)
1582 ; (setq in-face nil))
1583 ; (setq in-face (point)))
1586 (defmacro c-debug-sws-msg
(&rest args
)
1590 (defmacro c-put-is-sws
(beg end
)
1591 ;; This macro does a hidden buffer change.
1592 `(let ((beg ,beg
) (end ,end
))
1593 (put-text-property beg end
'c-is-sws t
)
1594 ,@(when (facep 'c-debug-is-sws-face
)
1595 `((c-debug-add-face beg end
'c-debug-is-sws-face
)))))
1597 (defmacro c-put-in-sws
(beg end
)
1598 ;; This macro does a hidden buffer change.
1599 `(let ((beg ,beg
) (end ,end
))
1600 (put-text-property beg end
'c-in-sws t
)
1601 ,@(when (facep 'c-debug-is-sws-face
)
1602 `((c-debug-add-face beg end
'c-debug-in-sws-face
)))))
1604 (defmacro c-remove-is-sws
(beg end
)
1605 ;; This macro does a hidden buffer change.
1606 `(let ((beg ,beg
) (end ,end
))
1607 (remove-text-properties beg end
'(c-is-sws nil
))
1608 ,@(when (facep 'c-debug-is-sws-face
)
1609 `((c-debug-remove-face beg end
'c-debug-is-sws-face
)))))
1611 (defmacro c-remove-in-sws
(beg end
)
1612 ;; This macro does a hidden buffer change.
1613 `(let ((beg ,beg
) (end ,end
))
1614 (remove-text-properties beg end
'(c-in-sws nil
))
1615 ,@(when (facep 'c-debug-is-sws-face
)
1616 `((c-debug-remove-face beg end
'c-debug-in-sws-face
)))))
1618 (defmacro c-remove-is-and-in-sws
(beg end
)
1619 ;; This macro does a hidden buffer change.
1620 `(let ((beg ,beg
) (end ,end
))
1621 (remove-text-properties beg end
'(c-is-sws nil c-in-sws nil
))
1622 ,@(when (facep 'c-debug-is-sws-face
)
1623 `((c-debug-remove-face beg end
'c-debug-is-sws-face
)
1624 (c-debug-remove-face beg end
'c-debug-in-sws-face
)))))
1626 (defsubst c-invalidate-sws-region-after
(beg end
)
1627 ;; Called from `after-change-functions'. Note that if
1628 ;; `c-forward-sws' or `c-backward-sws' are used outside
1629 ;; `c-save-buffer-state' or similar then this will remove the cache
1630 ;; properties right after they're added.
1632 ;; This function does hidden buffer changes.
1635 ;; Adjust the end to remove the properties in any following simple
1636 ;; ws up to and including the next line break, if there is any
1637 ;; after the changed region. This is necessary e.g. when a rung
1638 ;; marked empty line is converted to a line comment by inserting
1639 ;; "//" before the line break. In that case the line break would
1640 ;; keep the rung mark which could make a later `c-backward-sws'
1641 ;; move into the line comment instead of over it.
1643 (skip-chars-forward " \t\f\v")
1644 (when (and (eolp) (not (eobp)))
1645 (setq end
(1+ (point)))))
1647 (when (and (= beg end
)
1648 (get-text-property beg
'c-in-sws
)
1650 (get-text-property (1- beg
) 'c-in-sws
))
1651 ;; Ensure that an `c-in-sws' range gets broken. Note that it isn't
1652 ;; safe to keep a range that was continuous before the change. E.g:
1658 ;; There can be a "ladder" between "#" and "b". Now, if the newline
1659 ;; after "foo" is removed then "bar" will become part of the cpp
1660 ;; directive instead of a syntactically relevant token. In that
1661 ;; case there's no longer syntactic ws from "#" to "b".
1662 (setq beg
(1- beg
)))
1664 (c-debug-sws-msg "c-invalidate-sws-region-after [%s..%s]" beg end
)
1665 (c-remove-is-and-in-sws beg end
))
1667 (defun c-forward-sws ()
1668 ;; Used by `c-forward-syntactic-ws' to implement the unbounded search.
1670 ;; This function might do hidden buffer changes.
1672 (let (;; `rung-pos' is set to a position as early as possible in the
1673 ;; unmarked part of the simple ws region.
1674 (rung-pos (point)) next-rung-pos rung-end-pos last-put-in-sws-pos
1675 rung-is-marked next-rung-is-marked simple-ws-end
1676 ;; `safe-start' is set when it's safe to cache the start position.
1677 ;; It's not set if we've initially skipped over comments and line
1678 ;; continuations since we might have gone out through the end of a
1679 ;; macro then. This provision makes `c-forward-sws' not populate the
1680 ;; cache in the majority of cases, but otoh is `c-backward-sws' by far
1684 ;; Skip simple ws and do a quick check on the following character to see
1685 ;; if it's anything that can't start syntactic ws, so we can bail out
1686 ;; early in the majority of cases when there just are a few ws chars.
1687 (skip-chars-forward " \t\n\r\f\v")
1688 (when (looking-at c-syntactic-ws-start
)
1690 (setq rung-end-pos
(min (1+ (point)) (point-max)))
1691 (if (setq rung-is-marked
(text-property-any rung-pos rung-end-pos
1693 ;; Find the last rung position to avoid setting properties in all
1694 ;; the cases when the marked rung is complete.
1695 ;; (`next-single-property-change' is certain to move at least one
1697 (setq rung-pos
(1- (next-single-property-change
1698 rung-is-marked
'c-is-sws nil rung-end-pos
)))
1699 ;; Got no marked rung here. Since the simple ws might have started
1700 ;; inside a line comment or cpp directive we must set `rung-pos' as
1701 ;; high as possible.
1702 (setq rung-pos
(point)))
1704 (with-silent-modifications
1708 (when (and rung-is-marked
1709 (get-text-property (point) 'c-in-sws
))
1711 ;; The following search is the main reason that `c-in-sws'
1712 ;; and `c-is-sws' aren't combined to one property.
1713 (goto-char (next-single-property-change
1714 (point) 'c-in-sws nil
(point-max)))
1715 (unless (get-text-property (point) 'c-is-sws
)
1716 ;; If the `c-in-sws' region extended past the last
1717 ;; `c-is-sws' char we have to go back a bit.
1718 (or (get-text-property (1- (point)) 'c-is-sws
)
1719 (goto-char (previous-single-property-change
1720 (point) 'c-is-sws
)))
1724 "c-forward-sws cached move %s -> %s (max %s)"
1725 rung-pos
(point) (point-max))
1727 (setq rung-pos
(point))
1728 (and (> (skip-chars-forward " \t\n\r\f\v") 0)
1731 ;; We'll loop here if there is simple ws after the last rung.
1732 ;; That means that there's been some change in it and it's
1733 ;; possible that we've stepped into another ladder, so extend
1734 ;; the previous one to join with it if there is one, and try to
1735 ;; use the cache again.
1737 "c-forward-sws extending rung with [%s..%s] (max %s)"
1738 (1+ rung-pos
) (1+ (point)) (point-max))
1739 (unless (get-text-property (point) 'c-is-sws
)
1740 ;; Remove any `c-in-sws' property from the last char of
1741 ;; the rung before we mark it with `c-is-sws', so that we
1742 ;; won't connect with the remains of a broken "ladder".
1743 (c-remove-in-sws (point) (1+ (point))))
1744 (c-put-is-sws (1+ rung-pos
)
1746 (c-put-in-sws rung-pos
1747 (setq rung-pos
(point)
1748 last-put-in-sws-pos rung-pos
)))
1750 (setq simple-ws-end
(point))
1751 (c-forward-comments)
1754 ((/= (point) simple-ws-end
)
1755 ;; Skipped over comments. Don't cache at eob in case the buffer
1760 (and c-opt-cpp-prefix
1761 (looking-at c-opt-cpp-start
)
1762 (progn (skip-chars-backward " \t")
1765 (progn (backward-char)
1766 (not (eq (char-before) ?
\\))))))
1767 ;; Skip a preprocessor directive.
1769 (while (and (eq (char-before) ?
\\)
1770 (= (forward-line 1) 0))
1774 ;; Don't cache at eob in case the buffer is narrowed.
1777 ;; We've searched over a piece of non-white syntactic ws. See if this
1779 (setq next-rung-pos
(point))
1780 (skip-chars-forward " \t\n\r\f\v")
1781 (setq rung-end-pos
(min (1+ (point)) (point-max)))
1784 ;; Cache if we haven't skipped comments only, and if we started
1785 ;; either from a marked rung or from a completely uncached
1789 (not (get-text-property simple-ws-end
'c-in-sws
))))
1791 ;; See if there's a marked rung in the encountered simple ws. If
1792 ;; so then we can cache, unless `safe-start' is nil. Even then
1793 ;; we need to do this to check if the cache can be used for the
1795 (and (setq next-rung-is-marked
1796 (text-property-any next-rung-pos rung-end-pos
1802 "c-forward-sws caching [%s..%s] - [%s..%s] (max %s)"
1803 rung-pos
(1+ simple-ws-end
) next-rung-pos rung-end-pos
1806 ;; Remove the properties for any nested ws that might be cached.
1807 ;; Only necessary for `c-is-sws' since `c-in-sws' will be set
1809 (c-remove-is-sws (1+ simple-ws-end
) next-rung-pos
)
1810 (unless (and rung-is-marked
(= rung-pos simple-ws-end
))
1811 (c-put-is-sws rung-pos
1813 (setq rung-is-marked t
))
1814 (c-put-in-sws rung-pos
1815 (setq rung-pos
(point)
1816 last-put-in-sws-pos rung-pos
))
1817 (unless (get-text-property (1- rung-end-pos
) 'c-is-sws
)
1818 ;; Remove any `c-in-sws' property from the last char of
1819 ;; the rung before we mark it with `c-is-sws', so that we
1820 ;; won't connect with the remains of a broken "ladder".
1821 (c-remove-in-sws (1- rung-end-pos
) rung-end-pos
))
1822 (c-put-is-sws next-rung-pos
1826 "c-forward-sws not caching [%s..%s] - [%s..%s] (max %s)"
1827 rung-pos
(1+ simple-ws-end
) next-rung-pos rung-end-pos
1830 ;; Set `rung-pos' for the next rung. It's the same thing here as
1831 ;; initially, except that the rung position is set as early as
1832 ;; possible since we can't be in the ending ws of a line comment or
1833 ;; cpp directive now.
1834 (if (setq rung-is-marked next-rung-is-marked
)
1835 (setq rung-pos
(1- (next-single-property-change
1836 rung-is-marked
'c-is-sws nil rung-end-pos
)))
1837 (setq rung-pos next-rung-pos
))
1838 (setq safe-start t
)))
1840 ;; Make sure that the newly marked `c-in-sws' region doesn't connect to
1841 ;; another one after the point (which might occur when editing inside a
1842 ;; comment or macro).
1843 (when (eq last-put-in-sws-pos
(point))
1844 (cond ((< last-put-in-sws-pos
(point-max))
1846 "c-forward-sws clearing at %s for cache separation"
1847 last-put-in-sws-pos
)
1848 (c-remove-in-sws last-put-in-sws-pos
1849 (1+ last-put-in-sws-pos
)))
1851 ;; If at eob we have to clear the last character before the end
1852 ;; instead since the buffer might be narrowed and there might
1853 ;; be a `c-in-sws' after (point-max). In this case it's
1854 ;; necessary to clear both properties.
1856 "c-forward-sws clearing thoroughly at %s for cache separation"
1857 (1- last-put-in-sws-pos
))
1858 (c-remove-is-and-in-sws (1- last-put-in-sws-pos
)
1859 last-put-in-sws-pos
))))
1862 (defun c-backward-sws ()
1863 ;; Used by `c-backward-syntactic-ws' to implement the unbounded search.
1865 ;; This function might do hidden buffer changes.
1867 (let (;; `rung-pos' is set to a position as late as possible in the unmarked
1868 ;; part of the simple ws region.
1869 (rung-pos (point)) next-rung-pos last-put-in-sws-pos
1870 rung-is-marked simple-ws-beg cmt-skip-pos
)
1872 ;; Skip simple horizontal ws and do a quick check on the preceding
1873 ;; character to see if it's anything that can't end syntactic ws, so we can
1874 ;; bail out early in the majority of cases when there just are a few ws
1875 ;; chars. Newlines are complicated in the backward direction, so we can't
1877 (skip-chars-backward " \t\f")
1878 (when (and (not (bobp))
1881 (looking-at c-syntactic-ws-end
)))
1883 ;; Try to find a rung position in the simple ws preceding point, so that
1884 ;; we can get a cache hit even if the last bit of the simple ws has
1885 ;; changed recently.
1886 (setq simple-ws-beg
(point))
1887 (skip-chars-backward " \t\n\r\f\v")
1888 (if (setq rung-is-marked
(text-property-any
1889 (point) (min (1+ rung-pos
) (point-max))
1891 ;; `rung-pos' will be the earliest marked position, which means that
1892 ;; there might be later unmarked parts in the simple ws region.
1893 ;; It's not worth the effort to fix that; the last part of the
1894 ;; simple ws is also typically edited often, so it could be wasted.
1895 (goto-char (setq rung-pos rung-is-marked
))
1896 (goto-char simple-ws-beg
))
1898 (with-silent-modifications
1902 (when (and rung-is-marked
1904 (get-text-property (1- (point)) 'c-in-sws
))
1906 ;; The following search is the main reason that `c-in-sws'
1907 ;; and `c-is-sws' aren't combined to one property.
1908 (goto-char (previous-single-property-change
1909 (point) 'c-in-sws nil
(point-min)))
1910 (unless (get-text-property (point) 'c-is-sws
)
1911 ;; If the `c-in-sws' region extended past the first
1912 ;; `c-is-sws' char we have to go forward a bit.
1913 (goto-char (next-single-property-change
1914 (point) 'c-is-sws
)))
1917 "c-backward-sws cached move %s <- %s (min %s)"
1918 (point) rung-pos
(point-min))
1920 (setq rung-pos
(point))
1921 (if (and (< (min (skip-chars-backward " \t\f\v")
1923 (setq simple-ws-beg
(point))
1924 (skip-chars-backward " \t\n\r\f\v")))
1926 (setq rung-is-marked
1927 (text-property-any (point) rung-pos
1930 (goto-char simple-ws-beg
)
1933 ;; We'll loop here if there is simple ws before the first rung.
1934 ;; That means that there's been some change in it and it's
1935 ;; possible that we've stepped into another ladder, so extend
1936 ;; the previous one to join with it if there is one, and try to
1937 ;; use the cache again.
1939 "c-backward-sws extending rung with [%s..%s] (min %s)"
1940 rung-is-marked rung-pos
(point-min))
1941 (unless (get-text-property (1- rung-pos
) 'c-is-sws
)
1942 ;; Remove any `c-in-sws' property from the last char of
1943 ;; the rung before we mark it with `c-is-sws', so that we
1944 ;; won't connect with the remains of a broken "ladder".
1945 (c-remove-in-sws (1- rung-pos
) rung-pos
))
1946 (c-put-is-sws rung-is-marked
1948 (c-put-in-sws rung-is-marked
1950 (setq rung-pos rung-is-marked
1951 last-put-in-sws-pos rung-pos
))
1953 (c-backward-comments)
1954 (setq cmt-skip-pos
(point))
1957 ((and c-opt-cpp-prefix
1958 (/= cmt-skip-pos simple-ws-beg
)
1959 (c-beginning-of-macro))
1960 ;; Inside a cpp directive. See if it should be skipped over.
1961 (let ((cpp-beg (point)))
1963 ;; Move back over all line continuations in the region skipped
1964 ;; over by `c-backward-comments'. If we go past it then we
1965 ;; started inside the cpp directive.
1966 (goto-char simple-ws-beg
)
1968 (while (and (> (point) cmt-skip-pos
)
1969 (progn (backward-char)
1970 (eq (char-before) ?
\\)))
1971 (beginning-of-line))
1973 (if (< (point) cmt-skip-pos
)
1974 ;; Don't move past the cpp directive if we began inside
1975 ;; it. Note that the position at the end of the last line
1976 ;; of the macro is also considered to be within it.
1977 (progn (goto-char cmt-skip-pos
)
1980 ;; It's worthwhile to spend a little bit of effort on finding
1981 ;; the end of the macro, to get a good `simple-ws-beg'
1982 ;; position for the cache. Note that `c-backward-comments'
1983 ;; could have stepped over some comments before going into
1984 ;; the macro, and then `simple-ws-beg' must be kept on the
1985 ;; same side of those comments.
1986 (goto-char simple-ws-beg
)
1987 (skip-chars-backward " \t\n\r\f\v")
1988 (if (eq (char-before) ?
\\)
1991 (if (< (point) simple-ws-beg
)
1992 ;; Might happen if comments after the macro were skipped
1994 (setq simple-ws-beg
(point)))
1999 ((/= (save-excursion
2000 (skip-chars-forward " \t\n\r\f\v" simple-ws-beg
)
2001 (setq next-rung-pos
(point)))
2003 ;; Skipped over comments. Must put point at the end of
2004 ;; the simple ws at point since we might be after a line
2005 ;; comment or cpp directive that's been partially
2006 ;; narrowed out, and we can't risk marking the simple ws
2007 ;; at the end of it.
2008 (goto-char next-rung-pos
)
2011 ;; We've searched over a piece of non-white syntactic ws. See if this
2013 (setq next-rung-pos
(point))
2014 (skip-chars-backward " \t\f\v")
2017 ;; Cache if we started either from a marked rung or from a
2018 ;; completely uncached position.
2020 (not (get-text-property (1- simple-ws-beg
) 'c-in-sws
))
2022 ;; Cache if there's a marked rung in the encountered simple ws.
2024 (skip-chars-backward " \t\n\r\f\v")
2025 (text-property-any (point) (min (1+ next-rung-pos
) (point-max))
2030 "c-backward-sws caching [%s..%s] - [%s..%s] (min %s)"
2031 (point) (1+ next-rung-pos
)
2032 simple-ws-beg
(min (1+ rung-pos
) (point-max))
2035 ;; Remove the properties for any nested ws that might be cached.
2036 ;; Only necessary for `c-is-sws' since `c-in-sws' will be set
2038 (c-remove-is-sws (1+ next-rung-pos
) simple-ws-beg
)
2039 (unless (and rung-is-marked
(= simple-ws-beg rung-pos
))
2040 (let ((rung-end-pos (min (1+ rung-pos
) (point-max))))
2041 (unless (get-text-property (1- rung-end-pos
) 'c-is-sws
)
2042 ;; Remove any `c-in-sws' property from the last char of
2043 ;; the rung before we mark it with `c-is-sws', so that we
2044 ;; won't connect with the remains of a broken "ladder".
2045 (c-remove-in-sws (1- rung-end-pos
) rung-end-pos
))
2046 (c-put-is-sws simple-ws-beg
2048 (setq rung-is-marked t
)))
2049 (c-put-in-sws (setq simple-ws-beg
(point)
2050 last-put-in-sws-pos simple-ws-beg
)
2052 (c-put-is-sws (setq rung-pos simple-ws-beg
)
2053 (1+ next-rung-pos
)))
2056 "c-backward-sws not caching [%s..%s] - [%s..%s] (min %s)"
2057 (point) (1+ next-rung-pos
)
2058 simple-ws-beg
(min (1+ rung-pos
) (point-max))
2060 (setq rung-pos next-rung-pos
2061 simple-ws-beg
(point))
2064 ;; Make sure that the newly marked `c-in-sws' region doesn't connect to
2065 ;; another one before the point (which might occur when editing inside a
2066 ;; comment or macro).
2067 (when (eq last-put-in-sws-pos
(point))
2068 (cond ((< (point-min) last-put-in-sws-pos
)
2070 "c-backward-sws clearing at %s for cache separation"
2071 (1- last-put-in-sws-pos
))
2072 (c-remove-in-sws (1- last-put-in-sws-pos
)
2073 last-put-in-sws-pos
))
2075 ;; If at bob and the buffer is narrowed, we have to clear the
2076 ;; character we're standing on instead since there might be a
2077 ;; `c-in-sws' before (point-min). In this case it's necessary
2078 ;; to clear both properties.
2080 "c-backward-sws clearing thoroughly at %s for cache separation"
2081 last-put-in-sws-pos
)
2082 (c-remove-is-and-in-sws last-put-in-sws-pos
2083 (1+ last-put-in-sws-pos
)))))
2087 ;; Other whitespace tools
2088 (defun c-partial-ws-p (beg end
)
2089 ;; Is the region (beg end) WS, and is there WS (or BOB/EOB) next to the
2090 ;; region? This is a "heuristic" function. .....
2092 ;; The motivation for the second bit is to check whether removing this
2093 ;; region would coalesce two symbols.
2095 ;; FIXME!!! This function doesn't check virtual semicolons in any way. Be
2096 ;; careful about using this function for, e.g. AWK. (2007/3/7)
2098 (let ((end+1 (min (1+ end
) (point-max))))
2099 (or (progn (goto-char (max (point-min) (1- beg
)))
2100 (c-skip-ws-forward end
)
2102 (progn (goto-char beg
)
2103 (c-skip-ws-forward end
+1)
2104 (eq (point) end
+1))))))
2106 ;; A system for finding noteworthy parens before the point.
2108 (defconst c-state-cache-too-far
5000)
2109 ;; A maximum comfortable scanning distance, e.g. between
2110 ;; `c-state-cache-good-pos' and "HERE" (where we call c-parse-state). When
2111 ;; this distance is exceeded, we take "emergency measures", e.g. by clearing
2112 ;; the cache and starting again from point-min or a beginning of defun. This
2113 ;; value can be tuned for efficiency or set to a lower value for testing.
2115 (defvar c-state-cache nil
)
2116 (make-variable-buffer-local 'c-state-cache
)
2117 ;; The state cache used by `c-parse-state' to cut down the amount of
2118 ;; searching. It's the result from some earlier `c-parse-state' call. See
2119 ;; `c-parse-state''s doc string for details of its structure.
2121 ;; The use of the cached info is more effective if the next
2122 ;; `c-parse-state' call is on a line close by the one the cached state
2123 ;; was made at; the cache can actually slow down a little if the
2124 ;; cached state was made very far back in the buffer. The cache is
2125 ;; most effective if `c-parse-state' is used on each line while moving
2128 (defvar c-state-cache-good-pos
1)
2129 (make-variable-buffer-local 'c-state-cache-good-pos
)
2130 ;; This is a position where `c-state-cache' is known to be correct, or
2131 ;; nil (see below). It's a position inside one of the recorded unclosed
2132 ;; parens or the top level, but not further nested inside any literal or
2133 ;; subparen that is closed before the last recorded position.
2135 ;; The exact position is chosen to try to be close to yet earlier than
2136 ;; the position where `c-state-cache' will be called next. Right now
2137 ;; the heuristic is to set it to the position after the last found
2138 ;; closing paren (of any type) before the line on which
2139 ;; `c-parse-state' was called. That is chosen primarily to work well
2140 ;; with refontification of the current line.
2142 ;; 2009-07-28: When `c-state-point-min' and the last position where
2143 ;; `c-parse-state' or for which `c-invalidate-state-cache' was called, are
2144 ;; both in the same literal, there is no such "good position", and
2145 ;; c-state-cache-good-pos is then nil. This is the ONLY circumstance in which
2146 ;; it can be nil. In this case, `c-state-point-min-literal' will be non-nil.
2148 ;; 2009-06-12: In a brace desert, c-state-cache-good-pos may also be in
2149 ;; the middle of the desert, as long as it is not within a brace pair
2150 ;; recorded in `c-state-cache' or a paren/bracket pair.
2153 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2154 ;; We maintain a simple cache of positions which aren't in a literal, so as to
2155 ;; speed up testing for non-literality.
2156 (defconst c-state-nonlit-pos-interval
3000)
2157 ;; The approximate interval between entries in `c-state-nonlit-pos-cache'.
2159 (defvar c-state-nonlit-pos-cache nil
)
2160 (make-variable-buffer-local 'c-state-nonlit-pos-cache
)
2161 ;; A list of buffer positions which are known not to be in a literal or a cpp
2162 ;; construct. This is ordered with higher positions at the front of the list.
2163 ;; Only those which are less than `c-state-nonlit-pos-cache-limit' are valid.
2165 (defvar c-state-nonlit-pos-cache-limit
1)
2166 (make-variable-buffer-local 'c-state-nonlit-pos-cache-limit
)
2167 ;; An upper limit on valid entries in `c-state-nonlit-pos-cache'. This is
2168 ;; reduced by buffer changes, and increased by invocations of
2169 ;; `c-state-literal-at'.
2171 (defvar c-state-semi-nonlit-pos-cache nil
)
2172 (make-variable-buffer-local 'c-state-semi-nonlit-pos-cache
)
2173 ;; A list of buffer positions which are known not to be in a literal. This is
2174 ;; ordered with higher positions at the front of the list. Only those which
2175 ;; are less than `c-state-semi-nonlit-pos-cache-limit' are valid.
2177 (defvar c-state-semi-nonlit-pos-cache-limit
1)
2178 (make-variable-buffer-local 'c-state-semi-nonlit-pos-cache-limit
)
2179 ;; An upper limit on valid entries in `c-state-semi-nonlit-pos-cache'. This is
2180 ;; reduced by buffer changes, and increased by invocations of
2181 ;; `c-state-literal-at'. FIXME!!!
2183 (defsubst c-state-pp-to-literal
(from to
)
2184 ;; Do a parse-partial-sexp from FROM to TO, returning either
2185 ;; (STATE TYPE (BEG . END)) if TO is in a literal; or
2186 ;; (STATE) otherwise,
2187 ;; where STATE is the parsing state at TO, TYPE is the type of the literal
2188 ;; (one of 'c, 'c++, 'string) and (BEG . END) is the boundaries of the literal.
2190 ;; Only elements 3 (in a string), 4 (in a comment), 5 (following a quote),
2191 ;; 7 (comment type) and 8 (start of comment/string) (and possibly 9) of
2194 (let ((s (parse-partial-sexp from to
))
2196 (when (or (nth 3 s
) (nth 4 s
)) ; in a string or comment
2199 ((eq (nth 7 s
) t
) 'c
++)
2201 (parse-partial-sexp (point) (point-max)
2205 'syntax-table
)) ; stop at end of literal
2207 `(,s
,ty
(,(nth 8 s
) .
,(point)))
2210 (defun c-state-safe-place (here)
2211 ;; Return a buffer position before HERE which is "safe", i.e. outside any
2212 ;; string, comment, or macro.
2214 ;; NOTE: This function manipulates `c-state-nonlit-pos-cache'. This cache
2215 ;; MAY NOT contain any positions within macros, since macros are frequently
2216 ;; turned into comments by use of the `c-cpp-delimiter' category properties.
2217 ;; We cannot rely on this mechanism whilst determining a cache pos since
2218 ;; this function is also called from outwith `c-parse-state'.
2222 (let ((c c-state-nonlit-pos-cache
)
2223 pos npos high-pos lit macro-beg macro-end
)
2224 ;; Trim the cache to take account of buffer changes.
2225 (while (and c
(> (car c
) c-state-nonlit-pos-cache-limit
))
2227 (setq c-state-nonlit-pos-cache c
)
2229 (while (and c
(> (car c
) here
))
2230 (setq high-pos
(car c
))
2232 (setq pos
(or (car c
) (point-min)))
2236 ;; Add an element to `c-state-nonlit-pos-cache' each iteration.
2238 (<= (setq npos
(+ pos c-state-nonlit-pos-interval
)) here
)
2240 ;; Test for being in a literal. If so, go to after it.
2242 (setq lit
(car (cddr (c-state-pp-to-literal pos npos
))))
2244 (prog1 (<= (cdr lit
) here
)
2245 (setq npos
(cdr lit
)))))
2247 ;; Test for being in a macro. If so, go to after it.
2251 (and (c-beginning-of-macro) (/= (point) npos
) (point)))
2253 (c-syntactic-end-of-macro)
2254 (or (eobp) (forward-char))
2255 (setq macro-end
(point)))
2256 (or (null macro-beg
)
2257 (prog1 (<= macro-end here
)
2258 (setq npos macro-end
)))))
2261 (setq c-state-nonlit-pos-cache
(cons pos c-state-nonlit-pos-cache
)))
2262 ;; Add one extra element above HERE so as to to avoid the previous
2263 ;; expensive calculation when the next call is close to the current
2264 ;; one. This is especially useful when inside a large macro.
2265 (setq c-state-nonlit-pos-cache
(cons npos c-state-nonlit-pos-cache
)))
2267 (if (> pos c-state-nonlit-pos-cache-limit
)
2268 (setq c-state-nonlit-pos-cache-limit pos
))
2271 (defun c-state-semi-safe-place (here)
2272 ;; Return a buffer position before HERE which is "safe", i.e. outside any
2273 ;; string or comment. It may be in a macro.
2277 (let ((c c-state-semi-nonlit-pos-cache
)
2278 pos npos high-pos lit macro-beg macro-end
)
2279 ;; Trim the cache to take account of buffer changes.
2280 (while (and c
(> (car c
) c-state-semi-nonlit-pos-cache-limit
))
2282 (setq c-state-semi-nonlit-pos-cache c
)
2284 (while (and c
(> (car c
) here
))
2285 (setq high-pos
(car c
))
2287 (setq pos
(or (car c
) (point-min)))
2291 ;; Add an element to `c-state-semi-nonlit-pos-cache' each iteration.
2293 (<= (setq npos
(+ pos c-state-nonlit-pos-interval
)) here
)
2295 ;; Test for being in a literal. If so, go to after it.
2297 (setq lit
(car (cddr (c-state-pp-to-literal pos npos
))))
2299 (prog1 (<= (cdr lit
) here
)
2300 (setq npos
(cdr lit
))))))
2303 (setq c-state-semi-nonlit-pos-cache
2304 (cons pos c-state-semi-nonlit-pos-cache
))))
2306 (if (> pos c-state-semi-nonlit-pos-cache-limit
)
2307 (setq c-state-semi-nonlit-pos-cache-limit pos
))
2310 (defun c-state-literal-at (here)
2311 ;; If position HERE is inside a literal, return (START . END), the
2312 ;; boundaries of the literal (which may be outside the accessible bit of the
2313 ;; buffer). Otherwise, return nil.
2315 ;; This function is almost the same as `c-literal-limits'. Previously, it
2316 ;; differed in that it was a lower level function, and that it rigorously
2317 ;; followed the syntax from BOB. `c-literal-limits' is now (2011-12)
2318 ;; virtually identical to this function.
2322 (let ((pos (c-state-safe-place here
)))
2323 (car (cddr (c-state-pp-to-literal pos here
)))))))
2325 (defsubst c-state-lit-beg
(pos)
2326 ;; Return the start of the literal containing POS, or POS itself.
2327 (or (car (c-state-literal-at pos
))
2330 (defsubst c-state-cache-non-literal-place
(pos state
)
2331 ;; Return a position outside of a string/comment/macro at or before POS.
2332 ;; STATE is the parse-partial-sexp state at POS.
2333 (let ((res (if (or (nth 3 state
) ; in a string?
2334 (nth 4 state
)) ; in a comment?
2339 (if (c-beginning-of-macro)
2343 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2344 ;; Stuff to do with point-min, and coping with any literal there.
2345 (defvar c-state-point-min
1)
2346 (make-variable-buffer-local 'c-state-point-min
)
2347 ;; This is (point-min) when `c-state-cache' was last calculated. A change of
2348 ;; narrowing is likely to affect the parens that are visible before the point.
2350 (defvar c-state-point-min-lit-type nil
)
2351 (make-variable-buffer-local 'c-state-point-min-lit-type
)
2352 (defvar c-state-point-min-lit-start nil
)
2353 (make-variable-buffer-local 'c-state-point-min-lit-start
)
2354 ;; These two variables define the literal, if any, containing point-min.
2355 ;; Their values are, respectively, 'string, c, or c++, and the start of the
2356 ;; literal. If there's no literal there, they're both nil.
2358 (defvar c-state-min-scan-pos
1)
2359 (make-variable-buffer-local 'c-state-min-scan-pos
)
2360 ;; This is the earliest buffer-pos from which scanning can be done. It is
2361 ;; either the end of the literal containing point-min, or point-min itself.
2362 ;; It becomes nil if the buffer is changed earlier than this point.
2363 (defun c-state-get-min-scan-pos ()
2364 ;; Return the lowest valid scanning pos. This will be the end of the
2365 ;; literal enclosing point-min, or point-min itself.
2366 (or c-state-min-scan-pos
2370 (goto-char c-state-point-min-lit-start
)
2371 (if (eq c-state-point-min-lit-type
'string
)
2373 (forward-comment 1))
2374 (setq c-state-min-scan-pos
(point))))))
2376 (defun c-state-mark-point-min-literal ()
2377 ;; Determine the properties of any literal containing POINT-MIN, setting the
2378 ;; variables `c-state-point-min-lit-type', `c-state-point-min-lit-start',
2379 ;; and `c-state-min-scan-pos' accordingly. The return value is meaningless.
2380 (let ((p-min (point-min))
2384 (setq lit
(c-state-literal-at p-min
))
2386 (setq c-state-point-min-lit-type
2388 (goto-char (car lit
))
2390 ((looking-at c-block-comment-start-regexp
) 'c
)
2391 ((looking-at c-line-comment-starter
) 'c
++)
2393 c-state-point-min-lit-start
(car lit
)
2394 c-state-min-scan-pos
(cdr lit
))
2395 (setq c-state-point-min-lit-type nil
2396 c-state-point-min-lit-start nil
2397 c-state-min-scan-pos p-min
)))))
2400 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2401 ;; A variable which signals a brace dessert - helpful for reducing the number
2402 ;; of fruitless backward scans.
2403 (defvar c-state-brace-pair-desert nil
)
2404 (make-variable-buffer-local 'c-state-brace-pair-desert
)
2405 ;; Used only in `c-append-lower-brace-pair-to-state-cache'. It is set when
2406 ;; that defun has searched backwards for a brace pair and not found one. Its
2407 ;; value is either nil or a cons (PA . FROM), where PA is the position of the
2408 ;; enclosing opening paren/brace/bracket which bounds the backwards search (or
2409 ;; nil when at top level) and FROM is where the backward search started. It
2410 ;; is reset to nil in `c-invalidate-state-cache'.
2413 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2414 ;; Lowish level functions/macros which work directly on `c-state-cache', or a
2415 ;; list of like structure.
2416 (defmacro c-state-cache-top-lparen
(&optional cache
)
2417 ;; Return the address of the top left brace/bracket/paren recorded in CACHE
2418 ;; (default `c-state-cache') (or nil).
2419 (let ((cash (or cache
'c-state-cache
)))
2420 `(if (consp (car ,cash
))
2424 (defmacro c-state-cache-top-paren
(&optional cache
)
2425 ;; Return the address of the latest brace/bracket/paren (whether left or
2426 ;; right) recorded in CACHE (default `c-state-cache') or nil.
2427 (let ((cash (or cache
'c-state-cache
)))
2428 `(if (consp (car ,cash
))
2432 (defmacro c-state-cache-after-top-paren
(&optional cache
)
2433 ;; Return the position just after the latest brace/bracket/paren (whether
2434 ;; left or right) recorded in CACHE (default `c-state-cache') or nil.
2435 (let ((cash (or cache
'c-state-cache
)))
2436 `(if (consp (car ,cash
))
2439 (1+ (car ,cash
))))))
2441 (defun c-get-cache-scan-pos (here)
2442 ;; From the state-cache, determine the buffer position from which we might
2443 ;; scan forward to HERE to update this cache. This position will be just
2444 ;; after a paren/brace/bracket recorded in the cache, if possible, otherwise
2445 ;; return the earliest position in the accessible region which isn't within
2446 ;; a literal. If the visible portion of the buffer is entirely within a
2447 ;; literal, return NIL.
2448 (let ((c c-state-cache
) elt
)
2449 ;(while (>= (or (c-state-cache-top-lparen c) 1) here)
2451 (>= (c-state-cache-top-lparen c
) here
))
2457 (if (> (cdr elt
) here
)
2461 ((<= (c-state-get-min-scan-pos) here
)
2462 (c-state-get-min-scan-pos))
2465 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2466 ;; Variables which keep track of preprocessor constructs.
2467 (defvar c-state-old-cpp-beg-marker nil
)
2468 (make-variable-buffer-local 'c-state-old-cpp-beg-marker
)
2469 (defvar c-state-old-cpp-beg nil
)
2470 (make-variable-buffer-local 'c-state-old-cpp-beg
)
2471 (defvar c-state-old-cpp-end-marker nil
)
2472 (make-variable-buffer-local 'c-state-old-cpp-end-marker
)
2473 (defvar c-state-old-cpp-end nil
)
2474 (make-variable-buffer-local 'c-state-old-cpp-end
)
2475 ;; These are the limits of the macro containing point at the previous call of
2476 ;; `c-parse-state', or nil.
2478 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2479 ;; Defuns which analyze the buffer, yet don't change `c-state-cache'.
2480 (defun c-state-balance-parens-backwards (here- here
+ top
)
2481 ;; Return the position of the opening paren/brace/bracket before HERE- which
2482 ;; matches the outermost close p/b/b between HERE+ and TOP. Except when
2483 ;; there's a macro, HERE- and HERE+ are the same. Like this:
2485 ;; ............................................
2487 ;; ( [ ( .........#macro.. ) ( ) ] )
2490 ;; return HERE- HERE+ TOP
2492 ;; If there aren't enough opening paren/brace/brackets, return the position
2493 ;; of the outermost one found, or HERE- if there are none. If there are no
2494 ;; closing p/b/bs between HERE+ and TOP, return HERE-. HERE-/+ and TOP
2495 ;; must not be inside literals. Only the accessible portion of the buffer
2498 ;; PART 1: scan from `here+' up to `top', accumulating ")"s which enclose
2499 ;; `here'. Go round the next loop each time we pass over such a ")". These
2500 ;; probably match "("s before `here-'.
2501 (let (pos pa ren
+1 lonely-rens
)
2504 (narrow-to-region (point-min) top
) ; This can move point, sometimes.
2508 (setq ren
+1 (scan-lists pos
1 1)) ; might signal
2509 (setq lonely-rens
(cons ren
+1 lonely-rens
)
2512 ;; PART 2: Scan back before `here-' searching for the "("s
2513 ;; matching/mismatching the ")"s found above. We only need to direct the
2514 ;; caller to scan when we've encountered unmatched right parens.
2519 (and lonely-rens
; actual values aren't used.
2520 (setq pa
(scan-lists pos -
1 1)))
2522 (setq lonely-rens
(cdr lonely-rens
)))))
2525 (defun c-parse-state-get-strategy (here good-pos
)
2526 ;; Determine the scanning strategy for adjusting `c-parse-state', attempting
2527 ;; to minimize the amount of scanning. HERE is the pertinent position in
2528 ;; the buffer, GOOD-POS is a position where `c-state-cache' (possibly with
2529 ;; its head trimmed) is known to be good, or nil if there is no such
2532 ;; The return value is a list, one of the following:
2534 ;; o - ('forward START-POINT) - scan forward from START-POINT,
2535 ;; which is not less than the highest position in `c-state-cache' below here.
2536 ;; o - ('backward nil) - scan backwards (from HERE).
2537 ;; o - ('IN-LIT nil) - point is inside the literal containing point-min.
2538 (let ((cache-pos (c-get-cache-scan-pos here
)) ; highest position below HERE in cache (or 1)
2539 strategy
; 'forward, 'backward, or 'IN-LIT.
2541 (setq good-pos
(or good-pos
(c-state-get-min-scan-pos)))
2543 ((< here
(c-state-get-min-scan-pos))
2544 (setq strategy
'IN-LIT
))
2546 (setq strategy
'forward
2547 start-point
(max good-pos cache-pos
)))
2548 ((< (- good-pos here
) (- here cache-pos
)) ; FIXME!!! ; apply some sort of weighting.
2549 (setq strategy
'backward
))
2551 (setq strategy
'forward
2552 start-point cache-pos
)))
2553 (list strategy
(and (eq strategy
'forward
) start-point
))))
2556 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2557 ;; Routines which change `c-state-cache' and associated values.
2558 (defun c-renarrow-state-cache ()
2559 ;; The region (more precisely, point-min) has changed since we
2560 ;; calculated `c-state-cache'. Amend `c-state-cache' accordingly.
2561 (if (< (point-min) c-state-point-min
)
2562 ;; If point-min has MOVED BACKWARDS then we drop the state completely.
2563 ;; It would be possible to do a better job here and recalculate the top
2566 (c-state-mark-point-min-literal)
2567 (setq c-state-cache nil
2568 c-state-cache-good-pos c-state-min-scan-pos
2569 c-state-brace-pair-desert nil
))
2571 ;; point-min has MOVED FORWARD.
2573 ;; Is the new point-min inside a (different) literal?
2574 (unless (and c-state-point-min-lit-start
; at prev. point-min
2575 (< (point-min) (c-state-get-min-scan-pos)))
2576 (c-state-mark-point-min-literal))
2578 ;; Cut off a bit of the tail from `c-state-cache'.
2579 (let ((ptr (cons nil c-state-cache
))
2581 (while (and (setq pa
(c-state-cache-top-lparen (cdr ptr
)))
2582 (>= pa
(point-min)))
2583 (setq ptr
(cdr ptr
)))
2586 (if (eq (cdr ptr
) c-state-cache
)
2587 (setq c-state-cache nil
2588 c-state-cache-good-pos c-state-min-scan-pos
)
2590 (setq c-state-cache-good-pos
(1+ (c-state-cache-top-lparen))))
2593 (setq c-state-point-min
(point-min)))
2595 (defun c-append-lower-brace-pair-to-state-cache (from here
&optional upper-lim
)
2596 ;; If there is a brace pair preceding FROM in the buffer, at the same level
2597 ;; of nesting (not necessarily immediately preceding), push a cons onto
2598 ;; `c-state-cache' to represent it. FROM must not be inside a literal. If
2599 ;; UPPER-LIM is non-nil, we append the highest brace pair whose "}" is below
2602 ;; Return non-nil when this has been done.
2604 ;; The situation it copes with is this transformation:
2606 ;; OLD: { (.) {...........}
2610 ;; NEW: { {....} (.) {.........
2612 ;; LOWER BRACE PAIR HERE or HERE
2614 ;; This routine should be fast. Since it can get called a LOT, we maintain
2615 ;; `c-state-brace-pair-desert', a small cache of "failures", such that we
2616 ;; reduce the time wasted in repeated fruitless searches in brace deserts.
2620 (cache-pos (c-state-cache-top-lparen)) ; might be nil.
2621 (macro-start-or-from
2622 (progn (goto-char from
)
2623 (c-beginning-of-macro)
2625 (bra ; Position of "{".
2626 ;; Don't start scanning in the middle of a CPP construct unless
2627 ;; it contains HERE - these constructs, in Emacs, are "commented
2628 ;; out" with category properties.
2629 (if (eq (c-get-char-property macro-start-or-from
'category
)
2633 ce
) ; Position of "}"
2634 (or upper-lim
(setq upper-lim from
))
2636 ;; If we're essentially repeating a fruitless search, just give up.
2637 (unless (and c-state-brace-pair-desert
2638 (eq cache-pos
(car c-state-brace-pair-desert
))
2639 (or (null (car c-state-brace-pair-desert
))
2640 (> from
(car c-state-brace-pair-desert
)))
2641 (<= from
(cdr c-state-brace-pair-desert
)))
2642 ;; DESERT-LIM. Avoid repeated searching through the cached desert.
2644 (and c-state-brace-pair-desert
2645 (eq cache-pos
(car c-state-brace-pair-desert
))
2646 (>= from
(cdr c-state-brace-pair-desert
))
2647 (cdr c-state-brace-pair-desert
)))
2648 ;; CACHE-LIM. This limit will be necessary when an opening
2649 ;; paren at `cache-pos' has just had its matching close paren
2650 ;; inserted into the buffer. `cache-pos' continues to be a
2651 ;; search bound, even though the algorithm below would skip
2652 ;; over the new paren pair.
2653 (cache-lim (and cache-pos
(< cache-pos from
) cache-pos
)))
2656 ((and desert-lim cache-lim
)
2657 (max desert-lim cache-lim
))
2661 ;; The top limit is EOB to ensure that `bra' is inside the
2662 ;; accessible part of the buffer at the next scan operation.
2663 (1+ (buffer-size))))
2665 ;; In the next pair of nested loops, the inner one moves back past a
2666 ;; pair of (mis-)matching parens or brackets; the outer one moves
2667 ;; back over a sequence of unmatched close brace/paren/bracket each
2673 (and (setq ce
(scan-lists bra -
1 -
1)) ; back past )/]/}; might signal
2674 (setq bra
(scan-lists ce -
1 1)) ; back past (/[/{; might signal
2675 (or (> bra here
) ;(> ce here)
2678 (or (not (eq (char-after bra
) ?\
{))
2679 (and (goto-char bra
)
2680 (c-beginning-of-macro)
2681 (< (point) macro-start-or-from
))))))))
2682 (and ce
(< ce bra
)))
2683 (setq bra ce
)) ; If we just backed over an unbalanced closing
2686 (if (and ce
(< ce here
) (< bra ce
) (eq (char-after bra
) ?\
{))
2687 ;; We've found the desired brace-pair.
2689 (setq new-cons
(cons bra
(1+ ce
)))
2691 ((consp (car c-state-cache
))
2692 (setcar c-state-cache new-cons
))
2693 ((and (numberp (car c-state-cache
)) ; probably never happens
2694 (< ce
(car c-state-cache
)))
2695 (setcdr c-state-cache
2696 (cons new-cons
(cdr c-state-cache
))))
2697 (t (setq c-state-cache
(cons new-cons c-state-cache
)))))
2699 ;; We haven't found a brace pair. Record this in the cache.
2700 (setq c-state-brace-pair-desert
2701 (cons (if (and ce
(< bra ce
) (> ce here
)) ; {..} straddling HERE?
2704 (min here from
)))))))))
2706 (defsubst c-state-push-any-brace-pair
(bra+1 macro-start-or-here
)
2707 ;; If BRA+1 is nil, do nothing. Otherwise, BRA+1 is the buffer position
2708 ;; following a {, and that brace has a (mis-)matching } (or ]), and we
2709 ;; "push" "a" brace pair onto `c-state-cache'.
2711 ;; Here "push" means overwrite the top element if it's itself a brace-pair,
2712 ;; otherwise push it normally.
2714 ;; The brace pair we push is normally the one surrounding BRA+1, but if the
2715 ;; latter is inside a macro, not being a macro containing
2716 ;; MACRO-START-OR-HERE, we scan backwards through the buffer for a non-macro
2717 ;; base pair. This latter case is assumed to be rare.
2719 ;; Note: POINT is not preserved in this routine.
2721 (if (or (> bra
+1 macro-start-or-here
)
2722 (progn (goto-char bra
+1)
2723 (not (c-beginning-of-macro))))
2725 (cons (cons (1- bra
+1)
2726 (scan-lists bra
+1 1 1))
2727 (if (consp (car c-state-cache
))
2730 ;; N.B. This defsubst codes one method for the simple, normal case,
2731 ;; and a more sophisticated, slower way for the general case. Don't
2732 ;; eliminate this defsubst - it's a speed optimization.
2733 (c-append-lower-brace-pair-to-state-cache (1- bra
+1) (point-max)))))
2735 (defun c-append-to-state-cache (from here
)
2736 ;; Scan the buffer from FROM to HERE, adding elements into `c-state-cache'
2737 ;; for braces etc. Return a candidate for `c-state-cache-good-pos'.
2739 ;; FROM must be after the latest brace/paren/bracket in `c-state-cache', if
2740 ;; any. Typically, it is immediately after it. It must not be inside a
2742 (let ((here-bol (c-point 'bol here
))
2743 (macro-start-or-here
2744 (save-excursion (goto-char here
)
2745 (if (c-beginning-of-macro)
2748 pa
+1 ; pos just after an opening PAren (or brace).
2749 (ren+1 from
) ; usually a pos just after an closing paREN etc.
2750 ; Is actually the pos. to scan for a (/{/[ from,
2751 ; which sometimes is after a silly )/}/].
2752 paren
+1 ; Pos after some opening or closing paren.
2753 paren
+1s
; A list of `paren+1's; used to determine a
2755 bra
+1 ce
+1 ; just after L/R bra-ces.
2756 bra
+1s
; list of OLD values of bra+1.
2757 mstart
) ; start of a macro.
2761 (narrow-to-region (point-min) here
)
2762 ;; Each time round the following loop, we enter a successively deeper
2763 ;; level of brace/paren nesting. (Except sometimes we "continue at
2764 ;; the existing level".) `pa+1' is a pos inside an opening
2765 ;; brace/paren/bracket, usually just after it.
2768 ;; Each time round the next loop moves forward over an opening then
2769 ;; a closing brace/bracket/paren. This loop is white hot, so it
2770 ;; plays ugly tricks to go fast. DON'T PUT ANYTHING INTO THIS
2771 ;; LOOP WHICH ISN'T ABSOLUTELY NECESSARY!!! It terminates when a
2772 ;; call of `scan-lists' signals an error, which happens when there
2773 ;; are no more b/b/p's to scan.
2776 (setq pa
+1 (scan-lists ren
+1 1 -
1) ; Into (/{/[; might signal
2777 paren
+1s
(cons pa
+1 paren
+1s
))
2778 (setq ren
+1 (scan-lists pa
+1 1 1)) ; Out of )/}/]; might signal
2779 (if (and (eq (char-before pa
+1) ?
{)) ; Check for a macro later.
2781 (setcar paren
+1s ren
+1)))
2783 (if (and pa
+1 (> pa
+1 ren
+1))
2784 ;; We've just entered a deeper nesting level.
2786 ;; Insert the brace pair (if present) and the single open
2787 ;; paren/brace/bracket into `c-state-cache' It cannot be
2788 ;; inside a macro, except one around point, because of what
2789 ;; `c-neutralize-syntax-in-CPP' has done.
2790 (c-state-push-any-brace-pair bra
+1 macro-start-or-here
)
2791 ;; Insert the opening brace/bracket/paren position.
2792 (setq c-state-cache
(cons (1- pa
+1) c-state-cache
))
2793 ;; Clear admin stuff for the next more nested part of the scan.
2794 (setq ren
+1 pa
+1 pa
+1 nil bra
+1 nil bra
+1s nil
)
2795 t
) ; Carry on the loop
2797 ;; All open p/b/b's at this nesting level, if any, have probably
2798 ;; been closed by matching/mismatching ones. We're probably
2799 ;; finished - we just need to check for having found an
2800 ;; unmatched )/}/], which we ignore. Such a )/}/] can't be in a
2801 ;; macro, due the action of `c-neutralize-syntax-in-CPP'.
2802 (c-safe (setq ren
+1 (scan-lists ren
+1 1 1)))))) ; acts as loop control.
2804 ;; Record the final, innermost, brace-pair if there is one.
2805 (c-state-push-any-brace-pair bra
+1 macro-start-or-here
)
2807 ;; Determine a good pos
2808 (while (and (setq paren
+1 (car paren
+1s
))
2809 (> (if (> paren
+1 macro-start-or-here
)
2812 (setq mstart
(and (c-beginning-of-macro)
2814 (or mstart paren
+1))
2816 (setq paren
+1s
(cdr paren
+1s
)))
2818 ((and paren
+1 mstart
)
2819 (min paren
+1 mstart
))
2823 (defun c-remove-stale-state-cache (start-point here pps-point
)
2824 ;; Remove stale entries from the `c-cache-state', i.e. those which will
2825 ;; not be in it when it is amended for position HERE. Additionally, the
2826 ;; "outermost" open-brace entry before HERE will be converted to a cons if
2827 ;; the matching close-brace is scanned.
2829 ;; START-POINT is a "maximal" "safe position" - there must be no open
2830 ;; parens/braces/brackets between START-POINT and HERE.
2832 ;; As a second thing, calculate the result of parse-partial-sexp at
2833 ;; PPS-POINT, w.r.t. START-POINT. The motivation here is that
2834 ;; `c-state-cache-good-pos' may become PPS-POINT, but the caller may need to
2835 ;; adjust it to get outside a string/comment. (Sorry about this! The code
2836 ;; needs to be FAST).
2838 ;; Return a list (GOOD-POS SCAN-BACK-POS PPS-STATE), where
2839 ;; o - GOOD-POS is a position where the new value `c-state-cache' is known
2840 ;; to be good (we aim for this to be as high as possible);
2841 ;; o - SCAN-BACK-POS, if not nil, indicates there may be a brace pair
2842 ;; preceding POS which needs to be recorded in `c-state-cache'. It is a
2843 ;; position to scan backwards from. It is the position of the "{" of the
2844 ;; last element to be removed from `c-state-cache', when that elt is a
2845 ;; cons, otherwise nil.
2846 ;; o - PPS-STATE is the parse-partial-sexp state at PPS-POINT.
2849 (narrow-to-region 1 (point-max))
2850 (let* ((in-macro-start ; start of macro containing HERE or nil.
2853 (and (c-beginning-of-macro)
2855 (start-point-actual-macro-start ; Start of macro containing
2856 ; start-point or nil
2857 (and (< start-point here
)
2859 (goto-char start-point
)
2860 (and (c-beginning-of-macro)
2862 (start-point-actual-macro-end ; End of this macro, (maybe
2864 (and start-point-actual-macro-start
2866 (goto-char start-point-actual-macro-start
)
2869 pps-state
; Will be 9 or 10 elements long.
2871 upper-lim
; ,beyond which `c-state-cache' entries are removed
2873 pair-beg pps-point-state target-depth
)
2875 ;; Remove entries beyond HERE. Also remove any entries inside
2876 ;; a macro, unless HERE is in the same macro.
2878 (if (or (null c-state-old-cpp-beg
)
2879 (and (> here c-state-old-cpp-beg
)
2880 (< here c-state-old-cpp-end
)))
2882 (min here c-state-old-cpp-beg
)))
2883 (while (and c-state-cache
(>= (c-state-cache-top-lparen) upper-lim
))
2884 (setq scan-back-pos
(car-safe (car c-state-cache
)))
2885 (setq c-state-cache
(cdr c-state-cache
)))
2887 ;; If `upper-lim' is inside the last recorded brace pair, remove its
2888 ;; RBrace and indicate we'll need to search backwards for a previous
2890 (when (and c-state-cache
2891 (consp (car c-state-cache
))
2892 (> (cdar c-state-cache
) upper-lim
))
2893 (setcar c-state-cache
(caar c-state-cache
))
2894 (setq scan-back-pos
(car c-state-cache
)))
2896 ;; The next loop jumps forward out of a nested level of parens each
2897 ;; time round; the corresponding elements in `c-state-cache' are
2898 ;; removed. `pos' is just after the brace-pair or the open paren at
2899 ;; (car c-state-cache). There can be no open parens/braces/brackets
2900 ;; between `start-point'/`start-point-actual-macro-start' and HERE,
2901 ;; due to the interface spec to this function.
2902 (setq pos
(if (and start-point-actual-macro-end
2903 (not (eq start-point-actual-macro-start
2905 (1+ start-point-actual-macro-end
) ; get outside the macro as
2906 ; marked by a `category' text property.
2909 (while (and c-state-cache
2910 (or (numberp (car c-state-cache
)) ; Have we a { at all?
2911 (cdr c-state-cache
))
2914 ((null pps-state
) ; first time through
2915 (setq target-depth -
1))
2916 ((eq (car pps-state
) target-depth
) ; found closing ),},]
2917 (setq target-depth
(1- (car pps-state
))))
2918 ;; Do nothing when we've merely reached pps-point.
2924 (point) (if (< (point) pps-point
) pps-point here
)
2928 (if (= (point) pps-point
)
2929 (setq pps-point-state pps-state
))
2931 (when (eq (car pps-state
) target-depth
)
2932 (setq pos
(point)) ; POS is now just after an R-paren/brace.
2934 ((and (consp (car c-state-cache
))
2935 (eq (point) (cdar c-state-cache
)))
2936 ;; We've just moved out of the paren pair containing the brace-pair
2937 ;; at (car c-state-cache). `pair-beg' is where the open paren is,
2938 ;; and is potentially where the open brace of a cons in
2939 ;; c-state-cache will be.
2940 (setq pair-beg
(car-safe (cdr c-state-cache
))
2941 c-state-cache
(cdr-safe (cdr c-state-cache
)))) ; remove {}pair + containing Lparen.
2942 ((numberp (car c-state-cache
))
2943 (setq pair-beg
(car c-state-cache
)
2944 c-state-cache
(cdr c-state-cache
))) ; remove this
2946 ((numberp (cadr c-state-cache
))
2947 (setq pair-beg
(cadr c-state-cache
)
2948 c-state-cache
(cddr c-state-cache
))) ; Remove a paren pair
2949 ; together with enclosed brace pair.
2950 ;; (t nil) ; Ignore an unmated Rparen.
2953 (if (< (point) pps-point
)
2954 (setq pps-state
(parse-partial-sexp (point) pps-point
2955 nil nil
; TARGETDEPTH, STOPBEFORE
2958 ;; If the last paren pair we moved out of was actually a brace pair,
2959 ;; insert it into `c-state-cache'.
2960 (when (and pair-beg
(eq (char-after pair-beg
) ?
{))
2961 (if (consp (car-safe c-state-cache
))
2962 (setq c-state-cache
(cdr c-state-cache
)))
2963 (setq c-state-cache
(cons (cons pair-beg pos
)
2966 (list pos scan-back-pos pps-state
)))))
2968 (defun c-remove-stale-state-cache-backwards (here)
2969 ;; Strip stale elements of `c-state-cache' by moving backwards through the
2970 ;; buffer, and inform the caller of the scenario detected.
2972 ;; HERE is the position we're setting `c-state-cache' for.
2973 ;; CACHE-POS (a locally bound variable) is just after the latest recorded
2974 ;; position in `c-state-cache' before HERE, or a position at or near
2975 ;; point-min which isn't in a literal.
2977 ;; This function must only be called only when (> `c-state-cache-good-pos'
2978 ;; HERE). Usually the gap between CACHE-POS and HERE is large. It is thus
2979 ;; optimized to eliminate (or minimize) scanning between these two
2982 ;; Return a three element list (GOOD-POS SCAN-BACK-POS FWD-FLAG), where:
2983 ;; o - GOOD-POS is a "good position", where `c-state-cache' is valid, or
2984 ;; could become so after missing elements are inserted into
2985 ;; `c-state-cache'. This is JUST AFTER an opening or closing
2986 ;; brace/paren/bracket which is already in `c-state-cache' or just before
2987 ;; one otherwise. exceptionally (when there's no such b/p/b handy) the BOL
2988 ;; before `here''s line, or the start of the literal containing it.
2989 ;; o - SCAN-BACK-POS, if non-nil, indicates there may be a brace pair
2990 ;; preceding POS which isn't recorded in `c-state-cache'. It is a position
2991 ;; to scan backwards from.
2992 ;; o - FWD-FLAG, if non-nil, indicates there may be parens/braces between
2993 ;; POS and HERE which aren't recorded in `c-state-cache'.
2995 ;; The comments in this defun use "paren" to mean parenthesis or square
2996 ;; bracket (as contrasted with a brace), and "(" and ")" likewise.
2998 ;; . {..} (..) (..) ( .. { } ) (...) ( .... . ..)
3000 ;; CP E here D C good
3001 (let ((cache-pos (c-get-cache-scan-pos here
)) ; highest position below HERE in cache (or 1)
3002 (pos c-state-cache-good-pos
)
3003 pa ren
; positions of "(" and ")"
3004 dropped-cons
; whether the last element dropped from `c-state-cache'
3005 ; was a cons (representing a brace-pair)
3006 good-pos
; see above.
3007 lit
; (START . END) of a literal containing some point.
3008 here-lit-start here-lit-end
; bounds of literal containing `here'
3010 here- here
+ ; start/end of macro around HERE, or HERE
3011 (here-bol (c-point 'bol here
))
3012 (too-far-back (max (- here c-state-cache-too-far
) (point-min))))
3014 ;; Remove completely irrelevant entries from `c-state-cache'.
3015 (while (and c-state-cache
3016 (>= (setq pa
(c-state-cache-top-lparen)) here
))
3017 (setq dropped-cons
(consp (car c-state-cache
)))
3018 (setq c-state-cache
(cdr c-state-cache
))
3020 ;; At this stage, (> pos here);
3021 ;; (< (c-state-cache-top-lparen) here) (or is nil).
3024 ((and (consp (car c-state-cache
))
3025 (> (cdar c-state-cache
) here
))
3026 ;; CASE 1: The top of the cache is a brace pair which now encloses
3027 ;; `here'. As good-pos, return the address. of the "{". Since we've no
3028 ;; knowledge of what's inside these braces, we have no alternative but
3029 ;; to direct the caller to scan the buffer from the opening brace.
3030 (setq pos
(caar c-state-cache
))
3031 (setcar c-state-cache pos
)
3032 (list (1+ pos
) pos t
)) ; return value. We've just converted a brace pair
3033 ; entry into a { entry, so the caller needs to
3034 ; search for a brace pair before the {.
3036 ;; `here' might be inside a literal. Check for this.
3038 (setq lit
(c-state-literal-at here
)
3039 here-lit-start
(or (car lit
) here
)
3040 here-lit-end
(or (cdr lit
) here
))
3041 ;; Has `here' just "newly entered" a macro?
3043 (goto-char here-lit-start
)
3044 (if (and (c-beginning-of-macro)
3045 (or (null c-state-old-cpp-beg
)
3046 (not (= (point) c-state-old-cpp-beg
))))
3048 (setq here-
(point))
3050 (setq here
+ (point)))
3051 (setq here- here-lit-start
3052 here
+ here-lit-end
)))
3054 ;; `here' might be nested inside any depth of parens (or brackets but
3055 ;; not braces). Scan backwards to find the outermost such opening
3056 ;; paren, if there is one. This will be the scan position to return.
3058 (narrow-to-region cache-pos
(point-max))
3059 (setq pos
(c-state-balance-parens-backwards here- here
+ pos
)))
3060 nil
)) ; for the cond
3062 ((< pos here-lit-start
)
3063 ;; CASE 2: Address of outermost ( or [ which now encloses `here', but
3064 ;; didn't enclose the (previous) `c-state-cache-good-pos'. If there is
3065 ;; a brace pair preceding this, it will already be in `c-state-cache',
3066 ;; unless there was a brace pair after it, i.e. there'll only be one to
3067 ;; scan for if we've just deleted one.
3068 (list pos
(and dropped-cons pos
) t
)) ; Return value.
3070 ;; `here' isn't enclosed in a (previously unrecorded) bracket/paren.
3071 ;; Further forward scanning isn't needed, but we still need to find a
3072 ;; GOOD-POS. Step out of all enclosing "("s on HERE's line.
3075 (narrow-to-region here-bol
(point-max))
3076 (setq pos here-lit-start
)
3077 (c-safe (while (setq pa
(scan-lists pos -
1 1))
3078 (setq pos pa
)))) ; might signal
3079 nil
)) ; for the cond
3081 ((setq ren
(c-safe-scan-lists pos -
1 -
1 too-far-back
))
3082 ;; CASE 3: After a }/)/] before `here''s BOL.
3083 (list (1+ ren
) (and dropped-cons pos
) nil
)) ; Return value
3086 ;; CASE 4; Best of a bad job: BOL before `here-bol', or beginning of
3087 ;; literal containing it.
3088 (setq good-pos
(c-state-lit-beg (c-point 'bopl here-bol
)))
3089 (list good-pos
(and dropped-cons good-pos
) nil
)))))
3092 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3093 ;; Externally visible routines.
3095 (defun c-state-cache-init ()
3096 (setq c-state-cache nil
3097 c-state-cache-good-pos
1
3098 c-state-nonlit-pos-cache nil
3099 c-state-nonlit-pos-cache-limit
1
3100 c-state-semi-nonlit-pos-cache nil
3101 c-state-semi-nonlit-pos-cache-limit
1
3102 c-state-brace-pair-desert nil
3104 c-state-point-min-lit-type nil
3105 c-state-point-min-lit-start nil
3106 c-state-min-scan-pos
1
3107 c-state-old-cpp-beg nil
3108 c-state-old-cpp-end nil
)
3109 (c-state-mark-point-min-literal))
3111 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3112 ;; Debugging routines to dump `c-state-cache' in a "replayable" form.
3113 ;; (defmacro c-sc-de (elt) ; "c-state-cache-dump-element"
3114 ;; `(format ,(concat "(setq " (symbol-name elt) " %s) ") ,elt))
3115 ;; (defmacro c-sc-qde (elt) ; "c-state-cache-quote-dump-element"
3116 ;; `(format ,(concat "(setq " (symbol-name elt) " '%s) ") ,elt))
3117 ;; (defun c-state-dump ()
3118 ;; ;; For debugging.
3121 ;; (c-sc-qde c-state-cache)
3122 ;; (c-sc-de c-state-cache-good-pos)
3123 ;; (c-sc-qde c-state-nonlit-pos-cache)
3124 ;; (c-sc-de c-state-nonlit-pos-cache-limit)
3125 ;; (c-sc-qde c-state-brace-pair-desert)
3126 ;; (c-sc-de c-state-point-min)
3127 ;; (c-sc-de c-state-point-min-lit-type)
3128 ;; (c-sc-de c-state-point-min-lit-start)
3129 ;; (c-sc-de c-state-min-scan-pos)
3130 ;; (c-sc-de c-state-old-cpp-beg)
3131 ;; (c-sc-de c-state-old-cpp-end)))
3132 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
3134 (defun c-invalidate-state-cache-1 (here)
3135 ;; Invalidate all info on `c-state-cache' that applies to the buffer at HERE
3136 ;; or higher and set `c-state-cache-good-pos' accordingly. The cache is
3137 ;; left in a consistent state.
3139 ;; This is much like `c-whack-state-after', but it never changes a paren
3140 ;; pair element into an open paren element. Doing that would mean that the
3141 ;; new open paren wouldn't have the required preceding paren pair element.
3143 ;; This function is called from c-after-change.
3145 ;; The caches of non-literals:
3146 (if (< here c-state-nonlit-pos-cache-limit
)
3147 (setq c-state-nonlit-pos-cache-limit here
))
3148 (if (< here c-state-semi-nonlit-pos-cache-limit
)
3149 (setq c-state-semi-nonlit-pos-cache-limit here
))
3152 ;; Case 1: if `here' is in a literal containing point-min, everything
3153 ;; becomes (or is already) nil.
3154 (if (or (null c-state-cache-good-pos
)
3155 (< here
(c-state-get-min-scan-pos)))
3156 (setq c-state-cache nil
3157 c-state-cache-good-pos nil
3158 c-state-min-scan-pos nil
)
3160 ;; Truncate `c-state-cache' and set `c-state-cache-good-pos' to a value
3161 ;; below `here'. To maintain its consistency, we may need to insert a new
3163 (let ((here-bol (c-point 'bol here
))
3164 too-high-pa
; recorded {/(/[ next above here, or nil.
3165 dropped-cons
; was the last removed element a brace pair?
3167 ;; The easy bit - knock over-the-top bits off `c-state-cache'.
3168 (while (and c-state-cache
3169 (>= (setq pa
(c-state-cache-top-paren)) here
))
3170 (setq dropped-cons
(consp (car c-state-cache
))
3171 too-high-pa
(c-state-cache-top-lparen)
3172 c-state-cache
(cdr c-state-cache
)))
3174 ;; Do we need to add in an earlier brace pair, having lopped one off?
3175 (if (and dropped-cons
3176 (< too-high-pa
(+ here c-state-cache-too-far
)))
3177 (c-append-lower-brace-pair-to-state-cache too-high-pa here here-bol
))
3178 (setq c-state-cache-good-pos
(or (c-state-cache-after-top-paren)
3179 (c-state-get-min-scan-pos)))))
3181 ;; The brace-pair desert marker:
3182 (when (car c-state-brace-pair-desert
)
3183 (if (< here
(car c-state-brace-pair-desert
))
3184 (setq c-state-brace-pair-desert nil
)
3185 (if (< here
(cdr c-state-brace-pair-desert
))
3186 (setcdr c-state-brace-pair-desert here
)))))
3188 (defun c-parse-state-1 ()
3189 ;; Find and record all noteworthy parens between some good point earlier in
3190 ;; the file and point. That good point is at least the beginning of the
3191 ;; top-level construct we are in, or the beginning of the preceding
3192 ;; top-level construct if we aren't in one.
3194 ;; The returned value is a list of the noteworthy parens with the last one
3195 ;; first. If an element in the list is an integer, it's the position of an
3196 ;; open paren (of any type) which has not been closed before the point. If
3197 ;; an element is a cons, it gives the position of a closed BRACE paren
3198 ;; pair[*]; the car is the start brace position and the cdr is the position
3199 ;; following the closing brace. Only the last closed brace paren pair
3200 ;; before each open paren and before the point is recorded, and thus the
3201 ;; state never contains two cons elements in succession. When a close brace
3202 ;; has no matching open brace (e.g., the matching brace is outside the
3203 ;; visible region), it is not represented in the returned value.
3205 ;; [*] N.B. The close "brace" might be a mismatching close bracket or paren.
3206 ;; This defun explicitly treats mismatching parens/braces/brackets as
3207 ;; matching. It is the open brace which makes it a "brace" pair.
3209 ;; If POINT is within a macro, open parens and brace pairs within
3210 ;; THIS macro MIGHT be recorded. This depends on whether their
3211 ;; syntactic properties have been suppressed by
3212 ;; `c-neutralize-syntax-in-CPP'. This might need fixing (2008-12-11).
3214 ;; Currently no characters which are given paren syntax with the
3215 ;; syntax-table property are recorded, i.e. angle bracket arglist
3216 ;; parens are never present here. Note that this might change.
3218 ;; BUG: This function doesn't cope entirely well with unbalanced
3219 ;; parens in macros. (2008-12-11: this has probably been resolved
3220 ;; by the function `c-neutralize-syntax-in-CPP'.) E.g. in the
3221 ;; following case the brace before the macro isn't balanced with the
3228 ;; Note to maintainers: this function DOES get called with point
3229 ;; within comments and strings, so don't assume it doesn't!
3231 ;; This function might do hidden buffer changes.
3232 (let* ((here (point))
3233 (here-bopl (c-point 'bopl
))
3234 strategy
; 'forward, 'backward etc..
3235 ;; Candidate positions to start scanning from:
3236 cache-pos
; highest position below HERE already existing in
3239 start-point
; (when scanning forward) a place below HERE where there
3240 ; are no open parens/braces between it and HERE.
3243 scan-backward-pos scan-forward-p
) ; used for 'backward.
3244 ;; If POINT-MIN has changed, adjust the cache
3245 (unless (= (point-min) c-state-point-min
)
3246 (c-renarrow-state-cache))
3249 (setq res
(c-parse-state-get-strategy here c-state-cache-good-pos
)
3251 start-point
(cadr res
))
3255 ((eq strategy
'forward
)
3256 (setq res
(c-remove-stale-state-cache start-point here here-bopl
))
3257 (setq cache-pos
(car res
)
3258 scan-backward-pos
(cadr res
)
3259 bopl-state
(car (cddr res
))) ; will be nil if (< here-bopl
3261 (if scan-backward-pos
3262 (c-append-lower-brace-pair-to-state-cache scan-backward-pos here
))
3264 (c-append-to-state-cache cache-pos here
))
3265 (setq c-state-cache-good-pos
3267 (< good-pos
(- here c-state-cache-too-far
)))
3268 (c-state-cache-non-literal-place here-bopl bopl-state
)
3271 ((eq strategy
'backward
)
3272 (setq res
(c-remove-stale-state-cache-backwards here
)
3274 scan-backward-pos
(cadr res
)
3275 scan-forward-p
(car (cddr res
)))
3276 (if scan-backward-pos
3277 (c-append-lower-brace-pair-to-state-cache scan-backward-pos here
))
3278 (setq c-state-cache-good-pos
3280 (c-append-to-state-cache good-pos here
)
3283 (t ; (eq strategy 'IN-LIT)
3284 (setq c-state-cache nil
3285 c-state-cache-good-pos nil
))))
3289 (defun c-invalidate-state-cache (here)
3290 ;; This is a wrapper over `c-invalidate-state-cache-1'.
3292 ;; It suppresses the syntactic effect of the < and > (template) brackets and
3293 ;; of all parens in preprocessor constructs, except for any such construct
3294 ;; containing point. We can then call `c-invalidate-state-cache-1' without
3295 ;; worrying further about macros and template delimiters.
3296 (c-with-<-
>-as-parens-suppressed
3297 (if (and c-state-old-cpp-beg
3298 (< c-state-old-cpp-beg here
))
3299 (c-with-all-but-one-cpps-commented-out
3301 (min c-state-old-cpp-end here
)
3302 (c-invalidate-state-cache-1 here
))
3303 (c-with-cpps-commented-out
3304 (c-invalidate-state-cache-1 here
)))))
3306 (defmacro c-state-maybe-marker
(place marker
)
3307 ;; If PLACE is non-nil, return a marker marking it, otherwise nil.
3308 ;; We (re)use MARKER.
3310 (or ,marker
(setq ,marker
(make-marker)))
3311 (set-marker ,marker
,place
)))
3313 (defun c-parse-state ()
3314 ;; This is a wrapper over `c-parse-state-1'. See that function for a
3315 ;; description of the functionality and return value.
3317 ;; It suppresses the syntactic effect of the < and > (template) brackets and
3318 ;; of all parens in preprocessor constructs, except for any such construct
3319 ;; containing point. We can then call `c-parse-state-1' without worrying
3320 ;; further about macros and template delimiters.
3321 (let (here-cpp-beg here-cpp-end
)
3323 (when (c-beginning-of-macro)
3324 (setq here-cpp-beg
(point))
3326 (> (setq here-cpp-end
(c-syntactic-end-of-macro))
3328 (setq here-cpp-beg nil here-cpp-end nil
))))
3329 ;; FIXME!!! Put in a `condition-case' here to protect the integrity of the
3332 (c-with-<-
>-as-parens-suppressed
3333 (if (and here-cpp-beg
(> here-cpp-end here-cpp-beg
))
3334 (c-with-all-but-one-cpps-commented-out
3335 here-cpp-beg here-cpp-end
3337 (c-with-cpps-commented-out
3338 (c-parse-state-1))))
3339 (setq c-state-old-cpp-beg
3340 (c-state-maybe-marker here-cpp-beg c-state-old-cpp-beg-marker
)
3342 (c-state-maybe-marker here-cpp-end c-state-old-cpp-end-marker
)))))
3344 ;; Debug tool to catch cache inconsistencies. This is called from
3346 (defvar c-debug-parse-state nil
)
3347 (unless (fboundp 'c-real-parse-state
)
3348 (fset 'c-real-parse-state
(symbol-function 'c-parse-state
)))
3349 (cc-bytecomp-defun c-real-parse-state)
3351 (defvar c-parse-state-point nil
)
3352 (defvar c-parse-state-state nil
)
3353 (defun c-record-parse-state-state ()
3354 (setq c-parse-state-point
(point))
3355 (setq c-parse-state-state
3358 (let ((val (symbol-value arg
)))
3364 c-state-cache-good-pos
3365 c-state-nonlit-pos-cache
3366 c-state-nonlit-pos-cache-limit
3367 c-state-semi-nonlit-pos-cache
3368 c-state-semi-nonlit-pos-cache-limit
3369 c-state-brace-pair-desert
3371 c-state-point-min-lit-type
3372 c-state-point-min-lit-start
3373 c-state-min-scan-pos
3376 c-parse-state-point
))))
3377 (defun c-replay-parse-state-state ()
3382 (format "%s %s%s" (car arg
) (if (atom (cdr arg
)) "" "'") (cdr arg
)))
3383 c-parse-state-state
" ")
3386 (defun c-debug-parse-state-double-cons (state)
3387 (let (state-car conses-not-ok
)
3389 (setq state-car
(car state
)
3391 (if (and (consp state-car
)
3392 (consp (car state
)))
3393 (setq conses-not-ok t
)))
3396 (defun c-debug-parse-state ()
3397 (let ((here (point)) (res1 (c-real-parse-state)) res2
)
3398 (let ((c-state-cache nil
)
3399 (c-state-cache-good-pos 1)
3400 (c-state-nonlit-pos-cache nil
)
3401 (c-state-nonlit-pos-cache-limit 1)
3402 (c-state-brace-pair-desert nil
)
3403 (c-state-point-min 1)
3404 (c-state-point-min-lit-type nil
)
3405 (c-state-point-min-lit-start nil
)
3406 (c-state-min-scan-pos 1)
3407 (c-state-old-cpp-beg nil
)
3408 (c-state-old-cpp-end nil
))
3409 (setq res2
(c-real-parse-state)))
3410 (unless (equal res1 res2
)
3411 ;; The cache can actually go further back due to the ad-hoc way
3412 ;; the first paren is found, so try to whack off a bit of its
3413 ;; start before complaining.
3415 ;; (goto-char (or (c-least-enclosing-brace res2) (point)))
3416 ;; (c-beginning-of-defun-1)
3417 ;; (while (not (or (bobp) (eq (char-after) ?{)))
3418 ;; (c-beginning-of-defun-1))
3419 ;; (unless (equal (c-whack-state-before (point) res1) res2)
3420 ;; (message (concat "c-parse-state inconsistency at %s: "
3421 ;; "using cache: %s, from scratch: %s")
3422 ;; here res1 res2)))
3423 (message (concat "c-parse-state inconsistency at %s: "
3424 "using cache: %s, from scratch: %s")
3426 (message "Old state:")
3427 (c-replay-parse-state-state))
3429 (when (c-debug-parse-state-double-cons res1
)
3430 (message "c-parse-state INVALIDITY at %s: %s"
3432 (message "Old state:")
3433 (c-replay-parse-state-state))
3435 (c-record-parse-state-state)
3436 res2
; res1 correct a cascading series of errors ASAP
3439 (defun c-toggle-parse-state-debug (&optional arg
)
3441 (setq c-debug-parse-state
(c-calculate-state arg c-debug-parse-state
))
3442 (fset 'c-parse-state
(symbol-function (if c-debug-parse-state
3443 'c-debug-parse-state
3444 'c-real-parse-state
)))
3445 (c-keep-region-active)
3446 (message "c-debug-parse-state %sabled"
3447 (if c-debug-parse-state
"en" "dis")))
3448 (when c-debug-parse-state
3449 (c-toggle-parse-state-debug 1))
3452 (defun c-whack-state-before (bufpos paren-state
)
3453 ;; Whack off any state information from PAREN-STATE which lies
3454 ;; before BUFPOS. Not destructive on PAREN-STATE.
3455 (let* ((newstate (list nil
))
3459 (setq car
(car paren-state
)
3460 paren-state
(cdr paren-state
))
3461 (if (< (if (consp car
) (car car
) car
) bufpos
)
3462 (setq paren-state nil
)
3463 (setcdr ptr
(list car
))
3464 (setq ptr
(cdr ptr
))))
3467 (defun c-whack-state-after (bufpos paren-state
)
3468 ;; Whack off any state information from PAREN-STATE which lies at or
3469 ;; after BUFPOS. Not destructive on PAREN-STATE.
3472 (let ((car (car paren-state
)))
3474 ;; just check the car, because in a balanced brace
3475 ;; expression, it must be impossible for the corresponding
3476 ;; close brace to be before point, but the open brace to
3478 (if (<= bufpos
(car car
))
3480 (if (< bufpos
(cdr car
))
3481 ;; its possible that the open brace is before
3482 ;; bufpos, but the close brace is after. In that
3483 ;; case, convert this to a non-cons element. The
3484 ;; rest of the state is before bufpos, so we're
3486 (throw 'done
(cons (car car
) (cdr paren-state
)))
3487 ;; we know that both the open and close braces are
3488 ;; before bufpos, so we also know that everything else
3489 ;; on state is before bufpos.
3490 (throw 'done paren-state
)))
3493 ;; it's before bufpos, so everything else should too.
3494 (throw 'done paren-state
)))
3495 (setq paren-state
(cdr paren-state
)))
3498 (defun c-most-enclosing-brace (paren-state &optional bufpos
)
3499 ;; Return the bufpos of the innermost enclosing open paren before
3500 ;; bufpos, or nil if none was found.
3502 (or bufpos
(setq bufpos
134217727))
3504 (setq enclosingp
(car paren-state
)
3505 paren-state
(cdr paren-state
))
3506 (if (or (consp enclosingp
)
3507 (>= enclosingp bufpos
))
3508 (setq enclosingp nil
)
3509 (setq paren-state nil
)))
3512 (defun c-least-enclosing-brace (paren-state)
3513 ;; Return the bufpos of the outermost enclosing open paren, or nil
3514 ;; if none was found.
3517 (setq elem
(car paren-state
)
3518 paren-state
(cdr paren-state
))
3523 (defun c-safe-position (bufpos paren-state
)
3524 ;; Return the closest "safe" position recorded on PAREN-STATE that
3525 ;; is higher up than BUFPOS. Return nil if PAREN-STATE doesn't
3526 ;; contain any. Return nil if BUFPOS is nil, which is useful to
3527 ;; find the closest limit before a given limit that might be nil.
3529 ;; A "safe" position is a position at or after a recorded open
3530 ;; paren, or after a recorded close paren. The returned position is
3531 ;; thus either the first position after a close brace, or the first
3532 ;; position after an enclosing paren, or at the enclosing paren in
3533 ;; case BUFPOS is immediately after it.
3538 (setq elem
(car paren-state
))
3540 (cond ((< (cdr elem
) bufpos
)
3541 (throw 'done
(cdr elem
)))
3542 ((< (car elem
) bufpos
)
3544 (throw 'done
(min (1+ (car elem
)) bufpos
))))
3546 ;; elem is the position at and not after the opening paren, so
3547 ;; we can go forward one more step unless it's equal to
3548 ;; bufpos. This is useful in some cases avoid an extra paren
3549 ;; level between the safe position and bufpos.
3550 (throw 'done
(min (1+ elem
) bufpos
))))
3551 (setq paren-state
(cdr paren-state
)))))))
3553 (defun c-beginning-of-syntax ()
3554 ;; This is used for `font-lock-beginning-of-syntax-function'. It
3555 ;; goes to the closest previous point that is known to be outside
3556 ;; any string literal or comment. `c-state-cache' is used if it has
3557 ;; a position in the vicinity.
3558 (let* ((paren-state c-state-cache
)
3562 ;; Note: Similar code in `c-safe-position'. The
3563 ;; difference is that we accept a safe position at
3564 ;; the point and don't bother to go forward past open
3567 (setq elem
(car paren-state
))
3569 (cond ((<= (cdr elem
) (point))
3570 (throw 'done
(cdr elem
)))
3571 ((<= (car elem
) (point))
3572 (throw 'done
(car elem
))))
3573 (if (<= elem
(point))
3574 (throw 'done elem
)))
3575 (setq paren-state
(cdr paren-state
)))
3578 (if (> pos
(- (point) 4000))
3580 ;; The position is far back. Try `c-beginning-of-defun-1'
3581 ;; (although we can't be entirely sure it will go to a position
3582 ;; outside a comment or string in current emacsen). FIXME:
3583 ;; Consult `syntax-ppss' here.
3584 (c-beginning-of-defun-1)
3589 ;; Tools for scanning identifiers and other tokens.
3591 (defun c-on-identifier ()
3592 "Return non-nil if the point is on or directly after an identifier.
3593 Keywords are recognized and not considered identifiers. If an
3594 identifier is detected, the returned value is its starting position.
3595 If an identifier ends at the point and another begins at it \(can only
3596 happen in Pike) then the point for the preceding one is returned.
3598 Note that this function might do hidden buffer changes. See the
3599 comment at the start of cc-engine.el for more info."
3601 ;; FIXME: Shouldn't this function handle "operator" in C++?
3604 (skip-syntax-backward "w_")
3608 ;; Check for a normal (non-keyword) identifier.
3609 (and (looking-at c-symbol-start
)
3610 (not (looking-at c-keywords-regexp
))
3613 (when (c-major-mode-is 'pike-mode
)
3614 ;; Handle the `<operator> syntax in Pike.
3615 (let ((pos (point)))
3616 (skip-chars-backward "-!%&*+/<=>^|~[]()")
3617 (and (if (< (skip-chars-backward "`") 0)
3620 (eq (char-after) ?\
`))
3621 (looking-at c-symbol-key
)
3622 (>= (match-end 0) pos
)
3625 ;; Handle the "operator +" syntax in C++.
3626 (when (and c-overloadable-operators-regexp
3627 (= (c-backward-token-2 0) 0))
3629 (cond ((and (looking-at c-overloadable-operators-regexp
)
3630 (or (not c-opt-op-identifier-prefix
)
3631 (and (= (c-backward-token-2 1) 0)
3632 (looking-at c-opt-op-identifier-prefix
))))
3636 (and c-opt-op-identifier-prefix
3637 (looking-at c-opt-op-identifier-prefix
)
3638 (= (c-forward-token-2 1) 0)
3639 (looking-at c-overloadable-operators-regexp
)))
3644 (defsubst c-simple-skip-symbol-backward
()
3645 ;; If the point is at the end of a symbol then skip backward to the
3646 ;; beginning of it. Don't move otherwise. Return non-nil if point
3649 ;; This function might do hidden buffer changes.
3650 (or (< (skip-syntax-backward "w_") 0)
3651 (and (c-major-mode-is 'pike-mode
)
3652 ;; Handle the `<operator> syntax in Pike.
3653 (let ((pos (point)))
3654 (if (and (< (skip-chars-backward "-!%&*+/<=>^|~[]()") 0)
3655 (< (skip-chars-backward "`") 0)
3656 (looking-at c-symbol-key
)
3657 (>= (match-end 0) pos
))
3662 (defun c-beginning-of-current-token (&optional back-limit
)
3663 ;; Move to the beginning of the current token. Do not move if not
3664 ;; in the middle of one. BACK-LIMIT may be used to bound the
3665 ;; backward search; if given it's assumed to be at the boundary
3666 ;; between two tokens. Return non-nil if the point is moved, nil
3669 ;; This function might do hidden buffer changes.
3670 (let ((start (point)))
3671 (if (looking-at "\\w\\|\\s_")
3672 (skip-syntax-backward "w_" back-limit
)
3673 (when (< (skip-syntax-backward ".()" back-limit
) 0)
3674 (while (let ((pos (or (and (looking-at c-nonsymbol-token-regexp
)
3676 ;; `c-nonsymbol-token-regexp' should always match
3677 ;; since we've skipped backward over punctuator
3678 ;; or paren syntax, but consume one char in case
3679 ;; it doesn't so that we don't leave point before
3680 ;; some earlier incorrect token.
3683 (goto-char pos
))))))
3686 (defun c-end-of-current-token (&optional back-limit
)
3687 ;; Move to the end of the current token. Do not move if not in the
3688 ;; middle of one. BACK-LIMIT may be used to bound the backward
3689 ;; search; if given it's assumed to be at the boundary between two
3690 ;; tokens. Return non-nil if the point is moved, nil otherwise.
3692 ;; This function might do hidden buffer changes.
3693 (let ((start (point)))
3694 (cond ((< (skip-syntax-backward "w_" (1- start
)) 0)
3695 (skip-syntax-forward "w_"))
3696 ((< (skip-syntax-backward ".()" back-limit
) 0)
3698 (if (looking-at c-nonsymbol-token-regexp
)
3699 (goto-char (match-end 0))
3700 ;; `c-nonsymbol-token-regexp' should always match since
3701 ;; we've skipped backward over punctuator or paren
3702 ;; syntax, but move forward in case it doesn't so that
3703 ;; we don't leave point earlier than we started with.
3705 (< (point) start
)))))
3708 (defconst c-jump-syntax-balanced
3709 (if (memq 'gen-string-delim c-emacs-features
)
3710 "\\w\\|\\s_\\|\\s\(\\|\\s\)\\|\\s\"\\|\\s|"
3711 "\\w\\|\\s_\\|\\s\(\\|\\s\)\\|\\s\""))
3713 (defconst c-jump-syntax-unbalanced
3714 (if (memq 'gen-string-delim c-emacs-features
)
3715 "\\w\\|\\s_\\|\\s\"\\|\\s|"
3716 "\\w\\|\\s_\\|\\s\""))
3718 (defun c-forward-token-2 (&optional count balanced limit
)
3719 "Move forward by tokens.
3720 A token is defined as all symbols and identifiers which aren't
3721 syntactic whitespace \(note that multicharacter tokens like \"==\" are
3722 treated properly). Point is always either left at the beginning of a
3723 token or not moved at all. COUNT specifies the number of tokens to
3724 move; a negative COUNT moves in the opposite direction. A COUNT of 0
3725 moves to the next token beginning only if not already at one. If
3726 BALANCED is true, move over balanced parens, otherwise move into them.
3727 Also, if BALANCED is true, never move out of an enclosing paren.
3729 LIMIT sets the limit for the movement and defaults to the point limit.
3730 The case when LIMIT is set in the middle of a token, comment or macro
3731 is handled correctly, i.e. the point won't be left there.
3733 Return the number of tokens left to move \(positive or negative). If
3734 BALANCED is true, a move over a balanced paren counts as one. Note
3735 that if COUNT is 0 and no appropriate token beginning is found, 1 will
3736 be returned. Thus, a return value of 0 guarantees that point is at
3737 the requested position and a return value less \(without signs) than
3738 COUNT guarantees that point is at the beginning of some token.
3740 Note that this function might do hidden buffer changes. See the
3741 comment at the start of cc-engine.el for more info."
3743 (or count
(setq count
1))
3745 (- (c-backward-token-2 (- count
) balanced limit
))
3747 (let ((jump-syntax (if balanced
3748 c-jump-syntax-balanced
3749 c-jump-syntax-unbalanced
))
3754 ;; If count is zero we should jump if in the middle of a token.
3755 (c-end-of-current-token))
3758 (if limit
(narrow-to-region (point-min) limit
))
3760 (progn (c-forward-syntactic-ws) (point)))
3761 ;; Skip whitespace. Count this as a move if we did in
3763 (setq count
(max (1- count
) 0)))
3766 ;; Moved out of bounds. Make sure the returned count isn't zero.
3768 (if (zerop count
) (setq count
1))
3771 ;; Use `condition-case' to avoid having the limit tests
3778 (cond ((looking-at jump-syntax
)
3779 (goto-char (scan-sexps (point) 1))
3781 ((looking-at c-nonsymbol-token-regexp
)
3782 (goto-char (match-end 0))
3784 ;; `c-nonsymbol-token-regexp' above should always
3785 ;; match if there are correct tokens. Try to
3786 ;; widen to see if the limit was set in the
3787 ;; middle of one, else fall back to treating
3788 ;; the offending thing as a one character token.
3792 (looking-at c-nonsymbol-token-regexp
)))
3797 (c-forward-syntactic-ws)
3800 (error (goto-char last
)))
3804 (setq count
(1+ count
)))))
3808 (defun c-backward-token-2 (&optional count balanced limit
)
3809 "Move backward by tokens.
3810 See `c-forward-token-2' for details."
3812 (or count
(setq count
1))
3814 (- (c-forward-token-2 (- count
) balanced limit
))
3816 (or limit
(setq limit
(point-min)))
3817 (let ((jump-syntax (if balanced
3818 c-jump-syntax-balanced
3819 c-jump-syntax-unbalanced
))
3823 ;; The count is zero so try to skip to the beginning of the
3826 (progn (c-beginning-of-current-token) (point)))
3827 (if (< (point) limit
)
3828 ;; The limit is inside the same token, so return 1.
3831 ;; We're not in the middle of a token. If there's
3832 ;; whitespace after the point then we must move backward,
3833 ;; so set count to 1 in that case.
3834 (and (looking-at c-syntactic-ws-start
)
3835 ;; If we're looking at a '#' that might start a cpp
3836 ;; directive then we have to do a more elaborate check.
3837 (or (/= (char-after) ?
#)
3838 (not c-opt-cpp-prefix
)
3841 (progn (beginning-of-line)
3842 (looking-at "[ \t]*")
3845 (progn (backward-char)
3846 (not (eq (char-before) ?
\\)))))))
3849 ;; Use `condition-case' to avoid having to check for buffer
3850 ;; limits in `backward-char', `scan-sexps' and `goto-char' below.
3855 (c-backward-syntactic-ws)
3857 (if (looking-at jump-syntax
)
3858 (goto-char (scan-sexps (1+ (point)) -
1))
3859 ;; This can be very inefficient if there's a long
3860 ;; sequence of operator tokens without any separation.
3861 ;; That doesn't happen in practice, anyway.
3862 (c-beginning-of-current-token))
3863 (>= (point) limit
)))
3866 (error (goto-char last
)))
3868 (if (< (point) limit
)
3873 (defun c-forward-token-1 (&optional count balanced limit
)
3874 "Like `c-forward-token-2' but doesn't treat multicharacter operator
3875 tokens like \"==\" as single tokens, i.e. all sequences of symbol
3876 characters are jumped over character by character. This function is
3877 for compatibility only; it's only a wrapper over `c-forward-token-2'."
3878 (let ((c-nonsymbol-token-regexp "\\s.\\|\\s\(\\|\\s\)"))
3879 (c-forward-token-2 count balanced limit
)))
3881 (defun c-backward-token-1 (&optional count balanced limit
)
3882 "Like `c-backward-token-2' but doesn't treat multicharacter operator
3883 tokens like \"==\" as single tokens, i.e. all sequences of symbol
3884 characters are jumped over character by character. This function is
3885 for compatibility only; it's only a wrapper over `c-backward-token-2'."
3886 (let ((c-nonsymbol-token-regexp "\\s.\\|\\s\(\\|\\s\)"))
3887 (c-backward-token-2 count balanced limit
)))
3890 ;; Tools for doing searches restricted to syntactically relevant text.
3892 (defun c-syntactic-re-search-forward (regexp &optional bound noerror
3893 paren-level not-inside-token
3894 lookbehind-submatch
)
3895 "Like `re-search-forward', but only report matches that are found
3896 in syntactically significant text. I.e. matches in comments, macros
3897 or string literals are ignored. The start point is assumed to be
3898 outside any comment, macro or string literal, or else the content of
3899 that region is taken as syntactically significant text.
3901 If PAREN-LEVEL is non-nil, an additional restriction is added to
3902 ignore matches in nested paren sexps. The search will also not go
3903 outside the current list sexp, which has the effect that if the point
3904 should be moved to BOUND when no match is found \(i.e. NOERROR is
3905 neither nil nor t), then it will be at the closing paren if the end of
3906 the current list sexp is encountered first.
3908 If NOT-INSIDE-TOKEN is non-nil, matches in the middle of tokens are
3909 ignored. Things like multicharacter operators and special symbols
3910 \(e.g. \"`()\" in Pike) are handled but currently not floating point
3913 If LOOKBEHIND-SUBMATCH is non-nil, it's taken as a number of a
3914 subexpression in REGEXP. The end of that submatch is used as the
3915 position to check for syntactic significance. If LOOKBEHIND-SUBMATCH
3916 isn't used or if that subexpression didn't match then the start
3917 position of the whole match is used instead. The \"look behind\"
3918 subexpression is never tested before the starting position, so it
3919 might be a good idea to include \\=\\= as a match alternative in it.
3921 Optimization note: Matches might be missed if the \"look behind\"
3922 subexpression can match the end of nonwhite syntactic whitespace,
3923 i.e. the end of comments or cpp directives. This since the function
3924 skips over such things before resuming the search. It's on the other
3925 hand not safe to assume that the \"look behind\" subexpression never
3926 matches syntactic whitespace.
3928 Bug: Unbalanced parens inside cpp directives are currently not handled
3929 correctly \(i.e. they don't get ignored as they should) when
3932 Note that this function might do hidden buffer changes. See the
3933 comment at the start of cc-engine.el for more info."
3935 (or bound
(setq bound
(point-max)))
3936 (if paren-level
(setq paren-level -
1))
3938 ;;(message "c-syntactic-re-search-forward %s %s %S" (point) bound regexp)
3940 (let ((start (point))
3942 ;; Start position for the last search.
3944 ;; The `parse-partial-sexp' state between the start position
3947 ;; The current position after the last state update. The next
3948 ;; `parse-partial-sexp' continues from here.
3950 ;; The position at which to check the state and the state
3951 ;; there. This is separate from `state-pos' since we might
3952 ;; need to back up before doing the next search round.
3953 check-pos check-state
3954 ;; Last position known to end a token.
3955 (last-token-end-pos (point-min))
3956 ;; Set when a valid match is found.
3963 (setq search-pos
(point))
3964 (re-search-forward regexp bound noerror
))
3967 (setq state
(parse-partial-sexp
3968 state-pos
(match-beginning 0) paren-level nil state
)
3970 (if (setq check-pos
(and lookbehind-submatch
3971 (or (not paren-level
)
3973 (match-end lookbehind-submatch
)))
3974 (setq check-state
(parse-partial-sexp
3975 state-pos check-pos paren-level nil state
))
3976 (setq check-pos state-pos
3979 ;; NOTE: If we got a look behind subexpression and get
3980 ;; an insignificant match in something that isn't
3981 ;; syntactic whitespace (i.e. strings or in nested
3982 ;; parentheses), then we can never skip more than a
3983 ;; single character from the match start position
3984 ;; (i.e. `state-pos' here) before continuing the
3985 ;; search. That since the look behind subexpression
3986 ;; might match the end of the insignificant region in
3990 ((elt check-state
7)
3991 ;; Match inside a line comment. Skip to eol. Use
3992 ;; `re-search-forward' instead of `skip-chars-forward' to get
3993 ;; the right bound behavior.
3994 (re-search-forward "[\n\r]" bound noerror
))
3996 ((elt check-state
4)
3997 ;; Match inside a block comment. Skip to the '*/'.
3998 (search-forward "*/" bound noerror
))
4000 ((and (not (elt check-state
5))
4001 (eq (char-before check-pos
) ?
/)
4002 (not (c-get-char-property (1- check-pos
) 'syntax-table
))
4003 (memq (char-after check-pos
) '(?
/ ?
*)))
4004 ;; Match in the middle of the opener of a block or line
4006 (if (= (char-after check-pos
) ?
/)
4007 (re-search-forward "[\n\r]" bound noerror
)
4008 (search-forward "*/" bound noerror
)))
4010 ;; The last `parse-partial-sexp' above might have
4011 ;; stopped short of the real check position if the end
4012 ;; of the current sexp was encountered in paren-level
4013 ;; mode. The checks above are always false in that
4014 ;; case, and since they can do better skipping in
4015 ;; lookbehind-submatch mode, we do them before
4016 ;; checking the paren level.
4019 (/= (setq tmp
(car check-state
)) 0))
4020 ;; Check the paren level first since we're short of the
4021 ;; syntactic checking position if the end of the
4022 ;; current sexp was encountered by `parse-partial-sexp'.
4025 ;; Inside a nested paren sexp.
4026 (if lookbehind-submatch
4027 ;; See the NOTE above.
4028 (progn (goto-char state-pos
) t
)
4029 ;; Skip out of the paren quickly.
4030 (setq state
(parse-partial-sexp state-pos bound
0 nil state
)
4033 ;; Have exited the current paren sexp.
4036 ;; The last `parse-partial-sexp' call above
4037 ;; has left us just after the closing paren
4038 ;; in this case, so we can modify the bound
4039 ;; to leave the point at the right position
4041 (setq bound
(1- (point)))
4043 (signal 'search-failed
(list regexp
)))))
4045 ((setq tmp
(elt check-state
3))
4046 ;; Match inside a string.
4047 (if (or lookbehind-submatch
4048 (not (integerp tmp
)))
4049 ;; See the NOTE above.
4050 (progn (goto-char state-pos
) t
)
4051 ;; Skip to the end of the string before continuing.
4052 (let ((ender (make-string 1 tmp
)) (continue t
))
4053 (while (if (search-forward ender bound noerror
)
4055 (setq state
(parse-partial-sexp
4056 state-pos
(point) nil nil state
)
4059 (setq continue nil
)))
4064 (c-beginning-of-macro start
)))
4065 ;; Match inside a macro. Skip to the end of it.
4067 (cond ((<= (point) bound
) t
)
4069 (t (signal 'search-failed
(list regexp
)))))
4071 ((and not-inside-token
4072 (or (< check-pos last-token-end-pos
)
4075 (goto-char check-pos
)
4077 (c-end-of-current-token last-token-end-pos
))
4078 (setq last-token-end-pos
(point))))))
4080 (if lookbehind-submatch
4081 ;; See the NOTE above.
4082 (goto-char state-pos
)
4083 (goto-char (min last-token-end-pos bound
))))
4090 ;; Should loop to search again, but take care to avoid
4091 ;; looping on the same spot.
4092 (or (/= search-pos
(point))
4093 (if (= (point) bound
)
4096 (signal 'search-failed
(list regexp
)))
4102 (signal (car err
) (cdr err
))))
4104 ;;(message "c-syntactic-re-search-forward done %s" (or (match-end 0) (point)))
4108 (goto-char (match-end 0))
4111 ;; Search failed. Set point as appropriate.
4117 (defvar safe-pos-list
) ; bound in c-syntactic-skip-backward
4119 (defsubst c-ssb-lit-begin
()
4120 ;; Return the start of the literal point is in, or nil.
4121 ;; We read and write the variables `safe-pos', `safe-pos-list', `state'
4122 ;; bound in the caller.
4124 ;; Use `parse-partial-sexp' from a safe position down to the point to check
4125 ;; if it's outside comments and strings.
4127 (let ((pos (point)) safe-pos state pps-end-pos
)
4128 ;; Pick a safe position as close to the point as possible.
4130 ;; FIXME: Consult `syntax-ppss' here if our cache doesn't give a good
4133 (while (and safe-pos-list
4134 (> (car safe-pos-list
) (point)))
4135 (setq safe-pos-list
(cdr safe-pos-list
)))
4136 (unless (setq safe-pos
(car-safe safe-pos-list
))
4137 (setq safe-pos
(max (or (c-safe-position
4138 (point) (or c-state-cache
4142 safe-pos-list
(list safe-pos
)))
4144 ;; Cache positions along the way to use if we have to back up more. We
4145 ;; cache every closing paren on the same level. If the paren cache is
4146 ;; relevant in this region then we're typically already on the same
4147 ;; level as the target position. Note that we might cache positions
4148 ;; after opening parens in case safe-pos is in a nested list. That's
4149 ;; both uncommon and harmless.
4151 (setq state
(parse-partial-sexp
4154 (setq safe-pos
(point)
4155 safe-pos-list
(cons safe-pos safe-pos-list
)))
4157 ;; If the state contains the start of the containing sexp we cache that
4158 ;; position too, so that parse-partial-sexp in the next run has a bigger
4159 ;; chance of starting at the same level as the target position and thus
4160 ;; will get more good safe positions into the list.
4162 (setq safe-pos
(1+ (elt state
1))
4163 safe-pos-list
(cons safe-pos safe-pos-list
)))
4165 (if (or (elt state
3) (elt state
4))
4166 ;; Inside string or comment. Continue search at the
4170 (defun c-syntactic-skip-backward (skip-chars &optional limit paren-level
)
4171 "Like `skip-chars-backward' but only look at syntactically relevant chars,
4172 i.e. don't stop at positions inside syntactic whitespace or string
4173 literals. Preprocessor directives are also ignored, with the exception
4174 of the one that the point starts within, if any. If LIMIT is given,
4175 it's assumed to be at a syntactically relevant position.
4177 If PAREN-LEVEL is non-nil, the function won't stop in nested paren
4178 sexps, and the search will also not go outside the current paren sexp.
4179 However, if LIMIT or the buffer limit is reached inside a nested paren
4180 then the point will be left at the limit.
4182 Non-nil is returned if the point moved, nil otherwise.
4184 Note that this function might do hidden buffer changes. See the
4185 comment at the start of cc-engine.el for more info."
4187 (let ((start (point))
4189 ;; A list of syntactically relevant positions in descending
4190 ;; order. It's used to avoid scanning repeatedly over
4191 ;; potentially large regions with `parse-partial-sexp' to verify
4192 ;; each position. Used in `c-ssb-lit-begin'
4194 ;; The result from `c-beginning-of-macro' at the start position or the
4195 ;; start position itself if it isn't within a macro. Evaluated on
4198 ;; The earliest position after the current one with the same paren
4199 ;; level. Used only when `paren-level' is set.
4201 (paren-level-pos (point)))
4205 ;; The next loop "tries" to find the end point each time round,
4206 ;; loops when it hasn't succeeded.
4209 (< (skip-chars-backward skip-chars limit
) 0)
4211 (let ((pos (point)) state-2 pps-end-pos
)
4214 ;; Don't stop inside a literal
4215 ((setq lit-beg
(c-ssb-lit-begin))
4221 (setq state-2
(parse-partial-sexp
4222 pos paren-level-pos -
1)
4223 pps-end-pos
(point))
4224 (/= (car state-2
) 0)))
4225 ;; Not at the right level.
4227 (if (and (< (car state-2
) 0)
4228 ;; We stop above if we go out of a paren.
4229 ;; Now check whether it precedes or is
4230 ;; nested in the starting sexp.
4234 pps-end-pos paren-level-pos
4236 (< (car state-2
) 0)))
4238 ;; We've stopped short of the starting position
4239 ;; so the hit was inside a nested list. Go up
4240 ;; until we are at the right level.
4243 (goto-char (scan-lists pos -
1
4245 (setq paren-level-pos
(point))
4246 (if (and limit
(>= limit paren-level-pos
))
4252 (goto-char (or limit
(point-min)))
4255 ;; The hit was outside the list at the start
4256 ;; position. Go to the start of the list and exit.
4257 (goto-char (1+ (elt state-2
1)))
4260 ((c-beginning-of-macro limit
)
4264 (setq start-macro-beg
4267 (c-beginning-of-macro limit
)
4271 ;; It's inside the same macro we started in so it's
4272 ;; a relevant match.
4278 ;; Skip syntactic ws afterwards so that we don't stop at the
4279 ;; end of a comment if `skip-chars' is something like "^/".
4280 (c-backward-syntactic-ws)
4283 ;; We might want to extend this with more useful return values in
4285 (/= (point) start
)))
4287 ;; The following is an alternative implementation of
4288 ;; `c-syntactic-skip-backward' that uses backward movement to keep
4289 ;; track of the syntactic context. It turned out to be generally
4290 ;; slower than the one above which uses forward checks from earlier
4293 ;;(defconst c-ssb-stop-re
4294 ;; ;; The regexp matching chars `c-syntactic-skip-backward' needs to
4295 ;; ;; stop at to avoid going into comments and literals.
4297 ;; ;; Match comment end syntax and string literal syntax. Also match
4298 ;; ;; '/' for block comment endings (not covered by comment end
4300 ;; "\\s>\\|/\\|\\s\""
4301 ;; (if (memq 'gen-string-delim c-emacs-features)
4304 ;; (if (memq 'gen-comment-delim c-emacs-features)
4308 ;;(defconst c-ssb-stop-paren-re
4309 ;; ;; Like `c-ssb-stop-re' but also stops at paren chars.
4310 ;; (concat c-ssb-stop-re "\\|\\s(\\|\\s)"))
4312 ;;(defconst c-ssb-sexp-end-re
4313 ;; ;; Regexp matching the ending syntax of a complex sexp.
4314 ;; (concat c-string-limit-regexp "\\|\\s)"))
4316 ;;(defun c-syntactic-skip-backward (skip-chars &optional limit paren-level)
4317 ;; "Like `skip-chars-backward' but only look at syntactically relevant chars,
4318 ;;i.e. don't stop at positions inside syntactic whitespace or string
4319 ;;literals. Preprocessor directives are also ignored. However, if the
4320 ;;point is within a comment, string literal or preprocessor directory to
4321 ;;begin with, its contents is treated as syntactically relevant chars.
4322 ;;If LIMIT is given, it limits the backward search and the point will be
4323 ;;left there if no earlier position is found.
4325 ;;If PAREN-LEVEL is non-nil, the function won't stop in nested paren
4326 ;;sexps, and the search will also not go outside the current paren sexp.
4327 ;;However, if LIMIT or the buffer limit is reached inside a nested paren
4328 ;;then the point will be left at the limit.
4330 ;;Non-nil is returned if the point moved, nil otherwise.
4332 ;;Note that this function might do hidden buffer changes. See the
4333 ;;comment at the start of cc-engine.el for more info."
4335 ;; (save-restriction
4337 ;; (narrow-to-region limit (point-max)))
4339 ;; (let ((start (point)))
4341 ;; (while (let ((last-pos (point))
4343 ;; (skip-chars-backward skip-chars)
4346 ;; ;; Skip back over the same region as
4347 ;; ;; `skip-chars-backward' above, but keep to
4348 ;; ;; syntactically relevant positions.
4349 ;; (goto-char last-pos)
4351 ;; ;; `re-search-backward' with a single char regexp
4352 ;; ;; should be fast.
4353 ;; (re-search-backward
4354 ;; (if paren-level c-ssb-stop-paren-re c-ssb-stop-re)
4359 ;; ((looking-at "\\s(")
4360 ;; ;; `paren-level' is set and we've found the
4361 ;; ;; start of the containing paren.
4365 ;; ((looking-at c-ssb-sexp-end-re)
4366 ;; ;; We're at the end of a string literal or paren
4367 ;; ;; sexp (if `paren-level' is set).
4369 ;; (condition-case nil
4370 ;; (c-backward-sexp)
4372 ;; (goto-char limit)
4373 ;; (throw 'done t))))
4377 ;; ;; At the end of some syntactic ws or possibly
4378 ;; ;; after a plain '/' operator.
4379 ;; (let ((pos (point)))
4380 ;; (c-backward-syntactic-ws)
4381 ;; (if (= pos (point))
4382 ;; ;; Was a plain '/' operator. Go past it.
4383 ;; (backward-char)))))
4385 ;; (> (point) stop-pos))))
4387 ;; ;; Now the point is either at `stop-pos' or at some
4388 ;; ;; position further back if `stop-pos' was at a
4389 ;; ;; syntactically irrelevant place.
4391 ;; ;; Skip additional syntactic ws so that we don't stop
4392 ;; ;; at the end of a comment if `skip-chars' is
4393 ;; ;; something like "^/".
4394 ;; (c-backward-syntactic-ws)
4396 ;; (< (point) stop-pos))))
4398 ;; ;; We might want to extend this with more useful return values
4399 ;; ;; in the future.
4400 ;; (/= (point) start))))
4403 ;; Tools for handling comments and string literals.
4405 (defun c-in-literal (&optional lim detect-cpp
)
4406 "Return the type of literal point is in, if any.
4407 The return value is `c' if in a C-style comment, `c++' if in a C++
4408 style comment, `string' if in a string literal, `pound' if DETECT-CPP
4409 is non-nil and in a preprocessor line, or nil if somewhere else.
4410 Optional LIM is used as the backward limit of the search. If omitted,
4411 or nil, `c-beginning-of-defun' is used.
4413 The last point calculated is cached if the cache is enabled, i.e. if
4414 `c-in-literal-cache' is bound to a two element vector.
4416 Note that this function might do hidden buffer changes. See the
4417 comment at the start of cc-engine.el for more info."
4420 (let* ((safe-place (c-state-semi-safe-place (point)))
4421 (lit (c-state-pp-to-literal safe-place
(point))))
4424 (save-excursion (c-beginning-of-macro))
4427 (defun c-literal-limits (&optional lim near not-in-delimiter
)
4428 "Return a cons of the beginning and end positions of the comment or
4429 string surrounding point (including both delimiters), or nil if point
4430 isn't in one. If LIM is non-nil, it's used as the \"safe\" position
4431 to start parsing from. If NEAR is non-nil, then the limits of any
4432 literal next to point is returned. \"Next to\" means there's only
4433 spaces and tabs between point and the literal. The search for such a
4434 literal is done first in forward direction. If NOT-IN-DELIMITER is
4435 non-nil, the case when point is inside a starting delimiter won't be
4436 recognized. This only has effect for comments which have starting
4437 delimiters with more than one character.
4439 Note that this function might do hidden buffer changes. See the
4440 comment at the start of cc-engine.el for more info."
4443 (let* ((pos (point))
4444 (lim (or lim
(c-state-semi-safe-place pos
)))
4445 (pp-to-lit (save-restriction
4447 (c-state-pp-to-literal lim pos
)))
4448 (state (car pp-to-lit
))
4449 (lit-limits (car (cddr pp-to-lit
))))
4453 ((and (not not-in-delimiter
)
4455 (eq (char-before) ?
/)
4456 (looking-at "[/*]")) ; FIXME!!! use c-line/block-comment-starter. 2008-09-28.
4457 ;; We're standing in a comment starter.
4459 (cons (point) (progn (c-forward-single-comment) (point))))
4463 ;; Search forward for a literal.
4464 (skip-chars-forward " \t")
4466 ((looking-at c-string-limit-regexp
) ; String.
4467 (cons (point) (or (c-safe (c-forward-sexp 1) (point))
4470 ((looking-at c-comment-start-regexp
) ; Line or block comment.
4471 (cons (point) (progn (c-forward-single-comment) (point))))
4475 (skip-chars-backward " \t")
4477 (let ((end (point)) beg
)
4480 (< (skip-syntax-backward c-string-syntax
) 0)) ; String.
4481 (setq beg
(c-safe (c-backward-sexp 1) (point))))
4483 ((and (c-safe (forward-char -
2) t
)
4485 ;; Block comment. Due to the nature of line
4486 ;; comments, they will always be covered by the
4487 ;; normal case above.
4489 (c-backward-single-comment)
4490 ;; If LIM is bogus, beg will be bogus.
4491 (setq beg
(point))))
4493 (if beg
(cons beg end
))))))
4496 ;; In case external callers use this; it did have a docstring.
4497 (defalias 'c-literal-limits-fast
'c-literal-limits
)
4499 (defun c-collect-line-comments (range)
4500 "If the argument is a cons of two buffer positions (such as returned by
4501 `c-literal-limits'), and that range contains a C++ style line comment,
4502 then an extended range is returned that contains all adjacent line
4503 comments (i.e. all comments that starts in the same column with no
4504 empty lines or non-whitespace characters between them). Otherwise the
4505 argument is returned.
4507 Note that this function might do hidden buffer changes. See the
4508 comment at the start of cc-engine.el for more info."
4512 (if (and (consp range
) (progn
4513 (goto-char (car range
))
4514 (looking-at c-line-comment-starter
)))
4515 (let ((col (current-column))
4517 (bopl (c-point 'bopl
))
4519 ;; Got to take care in the backward direction to handle
4520 ;; comments which are preceded by code.
4521 (while (and (c-backward-single-comment)
4523 (looking-at c-line-comment-starter
)
4524 (= col
(current-column)))
4526 bopl
(c-point 'bopl
)))
4528 (while (and (progn (skip-chars-forward " \t")
4529 (looking-at c-line-comment-starter
))
4530 (= col
(current-column))
4531 (prog1 (zerop (forward-line 1))
4532 (setq end
(point)))))
4537 (defun c-literal-type (range)
4538 "Convenience function that given the result of `c-literal-limits',
4539 returns nil or the type of literal that the range surrounds, one
4540 of the symbols 'c, 'c++ or 'string. It's much faster than using
4541 `c-in-literal' and is intended to be used when you need both the
4542 type of a literal and its limits.
4544 Note that this function might do hidden buffer changes. See the
4545 comment at the start of cc-engine.el for more info."
4549 (goto-char (car range
))
4550 (cond ((looking-at c-string-limit-regexp
) 'string
)
4551 ((or (looking-at "//") ; c++ line comment
4552 (and (looking-at "\\s<") ; comment starter
4553 (looking-at "#"))) ; awk comment.
4555 (t 'c
))) ; Assuming the range is valid.
4558 (defsubst c-determine-limit-get-base
(start try-size
)
4559 ;; Get a "safe place" approximately TRY-SIZE characters before START.
4560 ;; This doesn't preserve point.
4561 (let* ((pos (max (- start try-size
) (point-min)))
4562 (base (c-state-semi-safe-place pos
))
4563 (s (parse-partial-sexp base pos
)))
4564 (if (or (nth 4 s
) (nth 3 s
)) ; comment or string
4568 (defun c-determine-limit (how-far-back &optional start try-size
)
4569 ;; Return a buffer position HOW-FAR-BACK non-literal characters from START
4570 ;; (default point). This is done by going back further in the buffer then
4571 ;; searching forward for literals. The position found won't be in a
4572 ;; literal. We start searching for the sought position TRY-SIZE (default
4573 ;; twice HOW-FAR-BACK) bytes back from START. This function must be fast.
4576 (let* ((start (or start
(point)))
4577 (try-size (or try-size
(* 2 how-far-back
)))
4578 (base (c-determine-limit-get-base start try-size
))
4581 (s (parse-partial-sexp pos pos
)) ; null state.
4584 (while (< pos start
)
4585 ;; Move forward one literal each time round this loop.
4586 ;; Move forward to the start of a comment or string.
4587 (setq s
(parse-partial-sexp
4593 'syntax-table
)) ; stop-comment
4595 ;; Gather details of the non-literal-bit - starting pos and size.
4596 (setq size
(- (if (or (nth 4 s
) (nth 3 s
))
4601 (setq stack
(cons (cons pos size
) stack
)))
4603 ;; Move forward to the end of the comment/string.
4604 (if (or (nth 4 s
) (nth 3 s
))
4605 (setq s
(parse-partial-sexp
4611 'syntax-table
))) ; stop-comment
4614 ;; Now try and find enough non-literal characters recorded on the stack.
4615 ;; Go back one recorded literal each time round this loop.
4616 (while (and (< count how-far-back
)
4618 (setq elt
(car stack
)
4620 (setq count
(+ count
(cdr elt
))))
4622 ;; Have we found enough yet?
4624 ((>= count how-far-back
)
4625 (+ (car elt
) (- count how-far-back
)))
4626 ((eq base
(point-min))
4629 (c-determine-limit (- how-far-back count
) base try-size
))))))
4631 (defun c-determine-+ve-limit
(how-far &optional start-pos
)
4632 ;; Return a buffer position about HOW-FAR non-literal characters forward
4633 ;; from START-POS (default point), which must not be inside a literal.
4635 (let ((pos (or start-pos
(point)))
4637 (s (parse-partial-sexp (point) (point)))) ; null state
4638 (while (and (not (eobp))
4640 ;; Scan over counted characters.
4641 (setq s
(parse-partial-sexp
4643 (min (+ pos count
) (point-max))
4647 'syntax-table
)) ; stop-comment
4648 (setq count
(- count
(- (point) pos
) 1)
4650 ;; Scan over literal characters.
4652 (setq s
(parse-partial-sexp
4658 'syntax-table
) ; stop-comment
4663 ;; `c-find-decl-spots' and accompanying stuff.
4665 ;; Variables used in `c-find-decl-spots' to cache the search done for
4666 ;; the first declaration in the last call. When that function starts,
4667 ;; it needs to back up over syntactic whitespace to look at the last
4668 ;; token before the region being searched. That can sometimes cause
4669 ;; moves back and forth over a quite large region of comments and
4670 ;; macros, which would be repeated for each changed character when
4671 ;; we're called during fontification, since font-lock refontifies the
4672 ;; current line for each change. Thus it's worthwhile to cache the
4675 ;; `c-find-decl-syntactic-pos' is a syntactically relevant position in
4676 ;; the syntactic whitespace less or equal to some start position.
4677 ;; There's no cached value if it's nil.
4679 ;; `c-find-decl-match-pos' is the match position if
4680 ;; `c-find-decl-prefix-search' matched before the syntactic whitespace
4681 ;; at `c-find-decl-syntactic-pos', or nil if there's no such match.
4682 (defvar c-find-decl-syntactic-pos nil
)
4683 (make-variable-buffer-local 'c-find-decl-syntactic-pos
)
4684 (defvar c-find-decl-match-pos nil
)
4685 (make-variable-buffer-local 'c-find-decl-match-pos
)
4687 (defsubst c-invalidate-find-decl-cache
(change-min-pos)
4688 (and c-find-decl-syntactic-pos
4689 (< change-min-pos c-find-decl-syntactic-pos
)
4690 (setq c-find-decl-syntactic-pos nil
)))
4692 ; (defface c-debug-decl-spot-face
4693 ; '((t (:background "Turquoise")))
4694 ; "Debug face to mark the spots where `c-find-decl-spots' stopped.")
4695 ; (defface c-debug-decl-sws-face
4696 ; '((t (:background "Khaki")))
4697 ; "Debug face to mark the syntactic whitespace between the declaration
4698 ; spots and the preceding token end.")
4700 (defmacro c-debug-put-decl-spot-faces
(match-pos decl-pos
)
4701 (when (facep 'c-debug-decl-spot-face
)
4702 `(c-save-buffer-state ((match-pos ,match-pos
) (decl-pos ,decl-pos
))
4703 (c-debug-add-face (max match-pos
(point-min)) decl-pos
4704 'c-debug-decl-sws-face
)
4705 (c-debug-add-face decl-pos
(min (1+ decl-pos
) (point-max))
4706 'c-debug-decl-spot-face
))))
4707 (defmacro c-debug-remove-decl-spot-faces
(beg end
)
4708 (when (facep 'c-debug-decl-spot-face
)
4709 `(c-save-buffer-state ()
4710 (c-debug-remove-face ,beg
,end
'c-debug-decl-spot-face
)
4711 (c-debug-remove-face ,beg
,end
'c-debug-decl-sws-face
))))
4713 (defmacro c-find-decl-prefix-search
()
4714 ;; Macro used inside `c-find-decl-spots'. It ought to be a defun,
4715 ;; but it contains lots of free variables that refer to things
4716 ;; inside `c-find-decl-spots'. The point is left at `cfd-match-pos'
4717 ;; if there is a match, otherwise at `cfd-limit'.
4719 ;; This macro might do hidden buffer changes.
4722 ;; Find the next property match position if we haven't got one already.
4723 (unless cfd-prop-match
4726 (goto-char (next-single-property-change
4727 (point) 'c-type nil cfd-limit
))
4728 (and (< (point) cfd-limit
)
4729 (not (eq (c-get-char-property (1- (point)) 'c-type
)
4731 (setq cfd-prop-match
(point))))
4733 ;; Find the next `c-decl-prefix-or-start-re' match if we haven't
4735 (unless cfd-re-match
4737 (if (> cfd-re-match-end
(point))
4738 (goto-char cfd-re-match-end
))
4740 (while (if (setq cfd-re-match-end
4741 (re-search-forward c-decl-prefix-or-start-re
4744 ;; Match. Check if it's inside a comment or string literal.
4746 (if (setq cfd-re-match
(match-end 1))
4747 ;; Matched the end of a token preceding a decl spot.
4749 (goto-char cfd-re-match
)
4751 ;; Matched a token that start a decl spot.
4752 (goto-char (match-beginning 0))
4756 ;; No match. Finish up and exit the loop.
4757 (setq cfd-re-match cfd-limit
)
4760 ;; Skip out of comments and string literals.
4762 (goto-char (next-single-property-change
4763 (point) 'face nil cfd-limit
))
4764 (and (< (point) cfd-limit
)
4765 (c-got-face-at (point) c-literal-faces
)))))
4767 ;; If we matched at the decl start, we have to back up over the
4768 ;; preceding syntactic ws to set `cfd-match-pos' and to catch
4769 ;; any decl spots in the syntactic ws.
4770 (unless cfd-re-match
4771 (c-backward-syntactic-ws)
4772 (setq cfd-re-match
(point))))
4774 ;; Choose whichever match is closer to the start.
4775 (if (< cfd-re-match cfd-prop-match
)
4776 (setq cfd-match-pos cfd-re-match
4778 (setq cfd-match-pos cfd-prop-match
4779 cfd-prop-match nil
))
4781 (goto-char cfd-match-pos
)
4783 (when (< cfd-match-pos cfd-limit
)
4784 ;; Skip forward past comments only so we don't skip macros.
4785 (c-forward-comments)
4786 ;; Set the position to continue at. We can avoid going over
4787 ;; the comments skipped above a second time, but it's possible
4788 ;; that the comment skipping has taken us past `cfd-prop-match'
4789 ;; since the property might be used inside comments.
4790 (setq cfd-continue-pos
(if cfd-prop-match
4791 (min cfd-prop-match
(point))
4794 (defun c-find-decl-spots (cfd-limit cfd-decl-re cfd-face-checklist cfd-fun
)
4795 ;; Call CFD-FUN for each possible spot for a declaration, cast or
4796 ;; label from the point to CFD-LIMIT.
4798 ;; CFD-FUN is called with point at the start of the spot. It's passed two
4799 ;; arguments: The first is the end position of the token preceding the spot,
4800 ;; or 0 for the implicit match at bob. The second is a flag that is t when
4801 ;; the match is inside a macro. Point should be moved forward by at least
4804 ;; If CFD-FUN adds `c-decl-end' properties somewhere below the current spot,
4805 ;; it should return non-nil to ensure that the next search will find them.
4808 ;; o The first token after bob.
4809 ;; o The first token after the end of submatch 1 in
4810 ;; `c-decl-prefix-or-start-re' when that submatch matches.
4811 ;; o The start of each `c-decl-prefix-or-start-re' match when
4812 ;; submatch 1 doesn't match.
4813 ;; o The first token after the end of each occurrence of the
4814 ;; `c-type' text property with the value `c-decl-end', provided
4815 ;; `c-type-decl-end-used' is set.
4817 ;; Only a spot that match CFD-DECL-RE and whose face is in the
4818 ;; CFD-FACE-CHECKLIST list causes CFD-FUN to be called. The face
4819 ;; check is disabled if CFD-FACE-CHECKLIST is nil.
4821 ;; If the match is inside a macro then the buffer is narrowed to the
4822 ;; end of it, so that CFD-FUN can investigate the following tokens
4823 ;; without matching something that begins inside a macro and ends
4824 ;; outside it. It's to avoid this work that the CFD-DECL-RE and
4825 ;; CFD-FACE-CHECKLIST checks exist.
4827 ;; The spots are visited approximately in order from top to bottom.
4828 ;; It's however the positions where `c-decl-prefix-or-start-re'
4829 ;; matches and where `c-decl-end' properties are found that are in
4830 ;; order. Since the spots often are at the following token, they
4831 ;; might be visited out of order insofar as more spots are reported
4832 ;; later on within the syntactic whitespace between the match
4833 ;; positions and their spots.
4835 ;; It's assumed that comments and strings are fontified in the
4838 ;; This is mainly used in fontification, and so has an elaborate
4839 ;; cache to handle repeated calls from the same start position; see
4840 ;; the variables above.
4842 ;; All variables in this function begin with `cfd-' to avoid name
4843 ;; collision with the (dynamically bound) variables used in CFD-FUN.
4845 ;; This function might do hidden buffer changes.
4847 (let ((cfd-start-pos (point))
4848 (cfd-buffer-end (point-max))
4849 ;; The end of the token preceding the decl spot last found
4850 ;; with `c-decl-prefix-or-start-re'. `cfd-limit' if there's
4853 ;; The end position of the last `c-decl-prefix-or-start-re'
4854 ;; match. If this is greater than `cfd-continue-pos', the
4855 ;; next regexp search is started here instead.
4856 (cfd-re-match-end (point-min))
4857 ;; The end of the last `c-decl-end' found by
4858 ;; `c-find-decl-prefix-search'. `cfd-limit' if there's no
4859 ;; match. If searching for the property isn't needed then we
4860 ;; disable it by setting it to `cfd-limit' directly.
4861 (cfd-prop-match (unless c-type-decl-end-used cfd-limit
))
4862 ;; The end of the token preceding the decl spot last found by
4863 ;; `c-find-decl-prefix-search'. 0 for the implicit match at
4864 ;; bob. `cfd-limit' if there's no match. In other words,
4865 ;; this is the minimum of `cfd-re-match' and `cfd-prop-match'.
4866 (cfd-match-pos cfd-limit
)
4867 ;; The position to continue searching at.
4869 ;; The position of the last "real" token we've stopped at.
4870 ;; This can be greater than `cfd-continue-pos' when we get
4871 ;; hits inside macros or at `c-decl-end' positions inside
4874 ;; The end position of the last entered macro.
4877 ;; Initialize by finding a syntactically relevant start position
4878 ;; before the point, and do the first `c-decl-prefix-or-start-re'
4879 ;; search unless we're at bob.
4881 (let (start-in-literal start-in-macro syntactic-pos
)
4882 ;; Must back up a bit since we look for the end of the previous
4883 ;; statement or declaration, which is earlier than the first
4887 ;; First we need to move to a syntactically relevant position.
4888 ;; Begin by backing out of comment or string literals.
4890 (when (c-got-face-at (point) c-literal-faces
)
4891 ;; Try to use the faces to back up to the start of the
4892 ;; literal. FIXME: What if the point is on a declaration
4893 ;; inside a comment?
4894 (while (and (not (bobp))
4895 (c-got-face-at (1- (point)) c-literal-faces
))
4896 (goto-char (previous-single-property-change
4897 (point) 'face nil
(point-min))))
4899 ;; XEmacs doesn't fontify the quotes surrounding string
4901 (and (featurep 'xemacs
)
4902 (eq (get-text-property (point) 'face
)
4903 'font-lock-string-face
)
4905 (progn (backward-char)
4906 (not (looking-at c-string-limit-regexp
)))
4909 ;; Don't trust the literal to contain only literal faces
4910 ;; (the font lock package might not have fontified the
4911 ;; start of it at all, for instance) so check that we have
4912 ;; arrived at something that looks like a start or else
4913 ;; resort to `c-literal-limits'.
4914 (unless (looking-at c-literal-start-regexp
)
4915 (let ((range (c-literal-limits)))
4916 (if range
(goto-char (car range
)))))
4918 (setq start-in-literal
(point)))
4920 ;; The start is in a literal. If the limit is in the same
4921 ;; one we don't have to find a syntactic position etc. We
4922 ;; only check that if the limit is at or before bonl to save
4923 ;; time; it covers the by far most common case when font-lock
4924 ;; refontifies the current line only.
4925 (<= cfd-limit
(c-point 'bonl cfd-start-pos
))
4927 (goto-char cfd-start-pos
)
4929 (goto-char (next-single-property-change
4930 (point) 'face nil cfd-limit
))
4931 (and (< (point) cfd-limit
)
4932 (c-got-face-at (point) c-literal-faces
))))
4933 (= (point) cfd-limit
)))
4935 ;; Completely inside a literal. Set up variables to trig the
4936 ;; (< cfd-continue-pos cfd-start-pos) case below and it'll
4937 ;; find a suitable start position.
4938 (setq cfd-continue-pos start-in-literal
))
4940 ;; Check if the region might be completely inside a macro, to
4941 ;; optimize that like the completely-inside-literal above.
4943 (and (= (forward-line 1) 0)
4944 (bolp) ; forward-line has funny behavior at eob.
4945 (>= (point) cfd-limit
)
4946 (progn (backward-char)
4947 (eq (char-before) ?
\\))))
4948 ;; (Maybe) completely inside a macro. Only need to trig the
4949 ;; (< cfd-continue-pos cfd-start-pos) case below to make it
4951 (setq cfd-continue-pos
(1- cfd-start-pos
)
4955 ;; Back out of any macro so we don't miss any declaration
4956 ;; that could follow after it.
4957 (when (c-beginning-of-macro)
4958 (setq start-in-macro t
))
4960 ;; Now we're at a proper syntactically relevant position so we
4961 ;; can use the cache. But first clear it if it applied
4963 (c-invalidate-find-decl-cache cfd-start-pos
)
4965 (setq syntactic-pos
(point))
4966 (unless (eq syntactic-pos c-find-decl-syntactic-pos
)
4967 ;; Don't have to do this if the cache is relevant here,
4968 ;; typically if the same line is refontified again. If
4969 ;; we're just some syntactic whitespace further down we can
4970 ;; still use the cache to limit the skipping.
4971 (c-backward-syntactic-ws c-find-decl-syntactic-pos
))
4973 ;; If we hit `c-find-decl-syntactic-pos' and
4974 ;; `c-find-decl-match-pos' is set then we install the cached
4975 ;; values. If we hit `c-find-decl-syntactic-pos' and
4976 ;; `c-find-decl-match-pos' is nil then we know there's no decl
4977 ;; prefix in the whitespace before `c-find-decl-syntactic-pos'
4978 ;; and so we can continue the search from this point. If we
4979 ;; didn't hit `c-find-decl-syntactic-pos' then we're now in
4980 ;; the right spot to begin searching anyway.
4981 (if (and (eq (point) c-find-decl-syntactic-pos
)
4982 c-find-decl-match-pos
)
4983 (setq cfd-match-pos c-find-decl-match-pos
4984 cfd-continue-pos syntactic-pos
)
4986 (setq c-find-decl-syntactic-pos syntactic-pos
)
4989 ;; Always consider bob a match to get the first
4990 ;; declaration in the file. Do this separately instead of
4991 ;; letting `c-decl-prefix-or-start-re' match bob, so that
4992 ;; regexp always can consume at least one character to
4993 ;; ensure that we won't get stuck in an infinite loop.
4994 (setq cfd-re-match
0)
4996 (c-beginning-of-current-token)
4997 (< (point) cfd-limit
))
4998 ;; Do an initial search now. In the bob case above it's
4999 ;; only done to search for a `c-decl-end' spot.
5000 (c-find-decl-prefix-search))
5002 (setq c-find-decl-match-pos
(and (< cfd-match-pos cfd-start-pos
)
5005 ;; Advance `cfd-continue-pos' if it's before the start position.
5006 ;; The closest continue position that might have effect at or
5007 ;; after the start depends on what we started in. This also
5008 ;; finds a suitable start position in the special cases when the
5009 ;; region is completely within a literal or macro.
5010 (when (and cfd-continue-pos
(< cfd-continue-pos cfd-start-pos
))
5014 ;; If we're in a macro then it's the closest preceding token
5015 ;; in the macro. Check this before `start-in-literal',
5016 ;; since if we're inside a literal in a macro, the preceding
5017 ;; token is earlier than any `c-decl-end' spot inside the
5018 ;; literal (comment).
5019 (goto-char (or start-in-literal cfd-start-pos
))
5020 ;; The only syntactic ws in macros are comments.
5021 (c-backward-comments)
5023 (c-beginning-of-current-token))
5026 ;; If we're in a comment it can only be the closest
5027 ;; preceding `c-decl-end' position within that comment, if
5028 ;; any. Go back to the beginning of such a property so that
5029 ;; `c-find-decl-prefix-search' will find the end of it.
5030 ;; (Can't stop at the end and install it directly on
5031 ;; `cfd-prop-match' since that variable might be cleared
5032 ;; after `cfd-fun' below.)
5034 ;; Note that if the literal is a string then the property
5035 ;; search will simply skip to the beginning of it right
5037 (if (not c-type-decl-end-used
)
5038 (goto-char start-in-literal
)
5039 (goto-char cfd-start-pos
)
5041 (goto-char (previous-single-property-change
5042 (point) 'c-type nil start-in-literal
))
5043 (and (> (point) start-in-literal
)
5044 (not (eq (c-get-char-property (point) 'c-type
)
5047 (when (= (point) start-in-literal
)
5048 ;; Didn't find any property inside the comment, so we can
5049 ;; skip it entirely. (This won't skip past a string, but
5050 ;; that'll be handled quickly by the next
5051 ;; `c-find-decl-prefix-search' anyway.)
5052 (c-forward-single-comment)
5053 (if (> (point) cfd-limit
)
5054 (goto-char cfd-limit
))))
5057 ;; If we started in normal code, the only match that might
5058 ;; apply before the start is what we already got in
5059 ;; `cfd-match-pos' so we can continue at the start position.
5060 ;; (Note that we don't get here if the first match is below
5062 (goto-char cfd-start-pos
)))
5064 ;; Delete found matches if they are before our new continue
5065 ;; position, so that `c-find-decl-prefix-search' won't back up
5066 ;; to them later on.
5067 (setq cfd-continue-pos
(point))
5068 (when (and cfd-re-match
(< cfd-re-match cfd-continue-pos
))
5069 (setq cfd-re-match nil
))
5070 (when (and cfd-prop-match
(< cfd-prop-match cfd-continue-pos
))
5071 (setq cfd-prop-match nil
)))
5074 ;; This is the normal case and we got a proper syntactic
5075 ;; position. If there's a match then it's always outside
5076 ;; macros and comments, so advance to the next token and set
5077 ;; `cfd-token-pos'. The loop below will later go back using
5078 ;; `cfd-continue-pos' to fix declarations inside the
5080 (when (and cfd-match-pos
(< cfd-match-pos syntactic-pos
))
5081 (goto-char syntactic-pos
)
5082 (c-forward-syntactic-ws)
5083 (and cfd-continue-pos
5084 (< cfd-continue-pos
(point))
5085 (setq cfd-token-pos
(point))))
5087 ;; Have one of the special cases when the region is completely
5088 ;; within a literal or macro. `cfd-continue-pos' is set to a
5089 ;; good start position for the search, so do it.
5090 (c-find-decl-prefix-search)))
5092 ;; Now loop. Round what? (ACM, 2006/7/5). We already got the first match.
5096 (< cfd-match-pos cfd-limit
)
5099 ;; Kludge to filter out matches on the "<" that
5100 ;; aren't open parens, for the sake of languages
5101 ;; that got `c-recognize-<>-arglists' set.
5102 (and (eq (char-before cfd-match-pos
) ?
<)
5103 (not (c-get-char-property (1- cfd-match-pos
)
5106 ;; If `cfd-continue-pos' is less or equal to
5107 ;; `cfd-token-pos', we've got a hit inside a macro
5108 ;; that's in the syntactic whitespace before the last
5109 ;; "real" declaration we've checked. If they're equal
5110 ;; we've arrived at the declaration a second time, so
5111 ;; there's nothing to do.
5112 (= cfd-continue-pos cfd-token-pos
)
5115 ;; If `cfd-continue-pos' is less than `cfd-token-pos'
5116 ;; we're still searching for declarations embedded in
5117 ;; the syntactic whitespace. In that case we need
5118 ;; only to skip comments and not macros, since they
5119 ;; can't be nested, and that's already been done in
5120 ;; `c-find-decl-prefix-search'.
5121 (when (> cfd-continue-pos cfd-token-pos
)
5122 (c-forward-syntactic-ws)
5123 (setq cfd-token-pos
(point)))
5125 ;; Continue if the following token fails the
5126 ;; CFD-DECL-RE and CFD-FACE-CHECKLIST checks.
5127 (when (or (>= (point) cfd-limit
)
5128 (not (looking-at cfd-decl-re
))
5129 (and cfd-face-checklist
5131 (point) cfd-face-checklist
))))
5132 (goto-char cfd-continue-pos
)
5135 (< (point) cfd-limit
))
5136 (c-find-decl-prefix-search))
5138 (< (point) cfd-limit
))
5141 (>= (point) cfd-start-pos
)
5144 ;; Narrow to the end of the macro if we got a hit inside
5145 ;; one, to avoid recognizing things that start inside the
5146 ;; macro and end outside it.
5147 (when (> cfd-match-pos cfd-macro-end
)
5148 ;; Not in the same macro as in the previous round.
5150 (goto-char cfd-match-pos
)
5152 (if (save-excursion (and (c-beginning-of-macro)
5153 (< (point) cfd-match-pos
)))
5154 (progn (c-end-of-macro)
5158 (if (zerop cfd-macro-end
)
5160 (if (> cfd-macro-end
(point))
5161 (progn (narrow-to-region (point-min) cfd-macro-end
)
5163 ;; The matched token was the last thing in the macro,
5164 ;; so the whole match is bogus.
5165 (setq cfd-macro-end
0)
5168 (c-debug-put-decl-spot-faces cfd-match-pos
(point))
5169 (if (funcall cfd-fun cfd-match-pos
(/= cfd-macro-end
0))
5170 (setq cfd-prop-match nil
))
5172 (when (/= cfd-macro-end
0)
5173 ;; Restore limits if we did macro narrowing above.
5174 (narrow-to-region (point-min) cfd-buffer-end
)))
5176 (goto-char cfd-continue-pos
)
5177 (if (= cfd-continue-pos cfd-limit
)
5178 (setq cfd-match-pos cfd-limit
)
5179 (c-find-decl-prefix-search))))) ; Moves point, sets cfd-continue-pos,
5180 ; cfd-match-pos, etc.
5183 ;; A cache for found types.
5185 ;; Buffer local variable that contains an obarray with the types we've
5186 ;; found. If a declaration is recognized somewhere we record the
5187 ;; fully qualified identifier in it to recognize it as a type
5188 ;; elsewhere in the file too. This is not accurate since we do not
5189 ;; bother with the scoping rules of the languages, but in practice the
5190 ;; same name is seldom used as both a type and something else in a
5191 ;; file, and we only use this as a last resort in ambiguous cases (see
5192 ;; `c-forward-decl-or-cast-1').
5194 ;; Not every type need be in this cache. However, things which have
5195 ;; ceased to be types must be removed from it.
5197 ;; Template types in C++ are added here too but with the template
5198 ;; arglist replaced with "<>" in references or "<" for the one in the
5199 ;; primary type. E.g. the type "Foo<A,B>::Bar<C>" is stored as
5200 ;; "Foo<>::Bar<". This avoids storing very long strings (since C++
5201 ;; template specs can be fairly sized programs in themselves) and
5202 ;; improves the hit ratio (it's a type regardless of the template
5203 ;; args; it's just not the same type, but we're only interested in
5204 ;; recognizing types, not telling distinct types apart). Note that
5205 ;; template types in references are added here too; from the example
5206 ;; above there will also be an entry "Foo<".
5207 (defvar c-found-types nil
)
5208 (make-variable-buffer-local 'c-found-types
)
5210 (defsubst c-clear-found-types
()
5211 ;; Clears `c-found-types'.
5212 (setq c-found-types
(make-vector 53 0)))
5214 (defun c-add-type (from to
)
5215 ;; Add the given region as a type in `c-found-types'. If the region
5216 ;; doesn't match an existing type but there is a type which is equal
5217 ;; to the given one except that the last character is missing, then
5218 ;; the shorter type is removed. That's done to avoid adding all
5219 ;; prefixes of a type as it's being entered and font locked. This
5220 ;; doesn't cover cases like when characters are removed from a type
5221 ;; or added in the middle. We'd need the position of point when the
5222 ;; font locking is invoked to solve this well.
5224 ;; This function might do hidden buffer changes.
5225 (let ((type (c-syntactic-content from to c-recognize-
<>-arglists
)))
5226 (unless (intern-soft type c-found-types
)
5227 (unintern (substring type
0 -
1) c-found-types
)
5228 (intern type c-found-types
))))
5230 (defun c-unfind-type (name)
5231 ;; Remove the "NAME" from c-found-types, if present.
5232 (unintern name c-found-types
))
5234 (defsubst c-check-type
(from to
)
5235 ;; Return non-nil if the given region contains a type in
5238 ;; This function might do hidden buffer changes.
5239 (intern-soft (c-syntactic-content from to c-recognize-
<>-arglists
)
5242 (defun c-list-found-types ()
5243 ;; Return all the types in `c-found-types' as a sorted list of
5246 (mapatoms (lambda (type)
5247 (setq type-list
(cons (symbol-name type
)
5250 (sort type-list
'string-lessp
)))
5252 ;; Shut up the byte compiler.
5253 (defvar c-maybe-stale-found-type
)
5255 (defun c-trim-found-types (beg end old-len
)
5256 ;; An after change function which, in conjunction with the info in
5257 ;; c-maybe-stale-found-type (set in c-before-change), removes a type
5258 ;; from `c-found-types', should this type have become stale. For
5259 ;; example, this happens to "foo" when "foo \n bar();" becomes
5260 ;; "foo(); \n bar();". Such stale types, if not removed, foul up
5261 ;; the fontification.
5263 ;; Have we, perhaps, added non-ws characters to the front/back of a found
5267 (when (< end
(point-max))
5269 (if (and (c-beginning-of-current-token) ; only moves when we started in the middle
5270 (progn (goto-char end
)
5271 (c-end-of-current-token)))
5272 (c-unfind-type (buffer-substring-no-properties
5274 (when (> beg
(point-min))
5276 (if (and (c-end-of-current-token) ; only moves when we started in the middle
5277 (progn (goto-char beg
)
5278 (c-beginning-of-current-token)))
5279 (c-unfind-type (buffer-substring-no-properties
5282 (if c-maybe-stale-found-type
; e.g. (c-decl-id-start "foo" 97 107 " (* ooka) " "o")
5284 ;; Changing the amount of (already existing) whitespace - don't do anything.
5285 ((and (c-partial-ws-p beg end
)
5286 (or (= beg end
) ; removal of WS
5287 (string-match "^[ \t\n\r\f\v]*$" (nth 5 c-maybe-stale-found-type
)))))
5289 ;; The syntactic relationship which defined a "found type" has been
5291 ((eq (car c-maybe-stale-found-type
) 'c-decl-id-start
)
5292 (c-unfind-type (cadr c-maybe-stale-found-type
)))
5293 ;; ((eq (car c-maybe-stale-found-type) 'c-decl-type-start) FIXME!!!
5297 ;; Setting and removing syntax properties on < and > in languages (C++
5298 ;; and Java) where they can be template/generic delimiters as well as
5299 ;; their normal meaning of "less/greater than".
5301 ;; Normally, < and > have syntax 'punctuation'. When they are found to
5302 ;; be delimiters, they are marked as such with the category properties
5303 ;; c-<-as-paren-syntax, c->-as-paren-syntax respectively.
5307 ;; It is impossible to determine with certainty whether a <..> pair in
5308 ;; C++ is two comparison operators or is template delimiters, unless
5309 ;; one duplicates a lot of a C++ compiler. For example, the following
5312 ;; foo (a < b, c > d) ;
5314 ;; could be a function call with two integer parameters (each a
5315 ;; relational expression), or it could be a constructor for class foo
5316 ;; taking one parameter d of templated type "a < b, c >". They are
5317 ;; somewhat easier to distinguish in Java.
5319 ;; The strategy now (2010-01) adopted is to mark and unmark < and
5320 ;; > IN MATCHING PAIRS ONLY. [Previously, they were marked
5321 ;; individually when their context so indicated. This gave rise to
5322 ;; intractable problems when one of a matching pair was deleted, or
5323 ;; pulled into a literal.]
5325 ;; At each buffer change, the syntax-table properties are removed in a
5326 ;; before-change function and reapplied, when needed, in an
5327 ;; after-change function. It is far more important that the
5328 ;; properties get removed when they they are spurious than that they
5329 ;; be present when wanted.
5330 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
5331 (defun c-clear-<-pair-props
(&optional pos
)
5332 ;; POS (default point) is at a < character. If it is marked with
5333 ;; open paren syntax-table text property, remove the property,
5334 ;; together with the close paren property on the matching > (if
5340 (when (equal (c-get-char-property (point) 'syntax-table
)
5341 c-
<-as-paren-syntax
)
5342 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5343 (c-go-list-forward))
5344 (when (equal (c-get-char-property (1- (point)) 'syntax-table
)
5345 c-
>-as-paren-syntax
) ; should always be true.
5346 (c-clear-char-property (1- (point)) 'category
))
5347 (c-clear-char-property pos
'category
))))
5349 (defun c-clear->-pair-props
(&optional pos
)
5350 ;; POS (default point) is at a > character. If it is marked with
5351 ;; close paren syntax-table property, remove the property, together
5352 ;; with the open paren property on the matching < (if any).
5357 (when (equal (c-get-char-property (point) 'syntax-table
)
5358 c-
>-as-paren-syntax
)
5359 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5360 (c-go-up-list-backward))
5361 (when (equal (c-get-char-property (point) 'syntax-table
)
5362 c-
<-as-paren-syntax
) ; should always be true.
5363 (c-clear-char-property (point) 'category
))
5364 (c-clear-char-property pos
'category
))))
5366 (defun c-clear-<>-pair-props
(&optional pos
)
5367 ;; POS (default point) is at a < or > character. If it has an
5368 ;; open/close paren syntax-table property, remove this property both
5369 ;; from the current character and its partner (which will also be
5372 ((eq (char-after) ?\
<)
5373 (c-clear-<-pair-props pos
))
5374 ((eq (char-after) ?\
>)
5375 (c-clear->-pair-props pos
))
5377 "c-clear-<>-pair-props called from wrong position"))))
5379 (defun c-clear-<-pair-props-if-match-after
(lim &optional pos
)
5380 ;; POS (default point) is at a < character. If it is both marked
5381 ;; with open/close paren syntax-table property, and has a matching >
5382 ;; (also marked) which is after LIM, remove the property both from
5383 ;; the current > and its partner. Return t when this happens, nil
5389 (when (equal (c-get-char-property (point) 'syntax-table
)
5390 c-
<-as-paren-syntax
)
5391 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5392 (c-go-list-forward))
5393 (when (and (>= (point) lim
)
5394 (equal (c-get-char-property (1- (point)) 'syntax-table
)
5395 c-
>-as-paren-syntax
)) ; should always be true.
5396 (c-unmark-<-
>-as-paren
(1- (point)))
5397 (c-unmark-<-
>-as-paren pos
))
5400 (defun c-clear->-pair-props-if-match-before
(lim &optional pos
)
5401 ;; POS (default point) is at a > character. If it is both marked
5402 ;; with open/close paren syntax-table property, and has a matching <
5403 ;; (also marked) which is before LIM, remove the property both from
5404 ;; the current < and its partner. Return t when this happens, nil
5410 (when (equal (c-get-char-property (point) 'syntax-table
)
5411 c-
>-as-paren-syntax
)
5412 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5413 (c-go-up-list-backward))
5414 (when (and (<= (point) lim
)
5415 (equal (c-get-char-property (point) 'syntax-table
)
5416 c-
<-as-paren-syntax
)) ; should always be true.
5417 (c-unmark-<-
>-as-paren
(point))
5418 (c-unmark-<-
>-as-paren pos
))
5421 ;; Set by c-common-init in cc-mode.el.
5425 (defun c-before-change-check-<>-operators
(beg end
)
5426 ;; Unmark certain pairs of "< .... >" which are currently marked as
5427 ;; template/generic delimiters. (This marking is via syntax-table
5428 ;; text properties).
5430 ;; These pairs are those which are in the current "statement" (i.e.,
5431 ;; the region between the {, }, or ; before BEG and the one after
5432 ;; END), and which enclose any part of the interval (BEG END).
5434 ;; Note that in C++ (?and Java), template/generic parens cannot
5435 ;; enclose a brace or semicolon, so we use these as bounds on the
5436 ;; region we must work on.
5438 ;; This function is called from before-change-functions (via
5439 ;; c-get-state-before-change-functions). Thus the buffer is widened,
5440 ;; and point is undefined, both at entry and exit.
5442 ;; FIXME!!! This routine ignores the possibility of macros entirely.
5445 (let ((beg-lit-limits (progn (goto-char beg
) (c-literal-limits)))
5446 (end-lit-limits (progn (goto-char end
) (c-literal-limits)))
5447 new-beg new-end need-new-beg need-new-end
)
5448 ;; Locate the barrier before the changed region
5449 (goto-char (if beg-lit-limits
(car beg-lit-limits
) beg
))
5450 (c-syntactic-skip-backward "^;{}" (c-determine-limit 512))
5451 (setq new-beg
(point))
5453 ;; Remove the syntax-table properties from each pertinent <...> pair.
5454 ;; Firsly, the ones with the < before beg and > after beg.
5455 (while (c-search-forward-char-property 'category
'c-
<-as-paren-syntax beg
)
5456 (if (c-clear-<-pair-props-if-match-after beg
(1- (point)))
5457 (setq need-new-beg t
)))
5459 ;; Locate the barrier after END.
5460 (goto-char (if end-lit-limits
(cdr end-lit-limits
) end
))
5461 (c-syntactic-re-search-forward "[;{}]" (c-determine-+ve-limit
512) 'end
)
5462 (setq new-end
(point))
5464 ;; Remove syntax-table properties from the remaining pertinent <...>
5465 ;; pairs, those with a > after end and < before end.
5466 (while (c-search-backward-char-property 'category
'c-
>-as-paren-syntax end
)
5467 (if (c-clear->-pair-props-if-match-before end
)
5468 (setq need-new-end t
)))
5470 ;; Extend the fontification region, if needed.
5473 (c-forward-syntactic-ws)
5474 (and (< (point) c-new-BEG
) (setq c-new-BEG
(point))))
5477 (and (> new-end c-new-END
) (setq c-new-END new-end
))))))
5481 (defun c-after-change-check-<>-operators
(beg end
)
5482 ;; This is called from `after-change-functions' when
5483 ;; c-recognize-<>-arglists' is set. It ensures that no "<" or ">"
5484 ;; chars with paren syntax become part of another operator like "<<"
5487 ;; This function might do hidden buffer changes.
5491 (when (or (looking-at "[<>]")
5492 (< (skip-chars-backward "<>") 0))
5495 (c-beginning-of-current-token)
5496 (when (and (< (point) beg
)
5497 (looking-at c-
<>-multichar-token-regexp
)
5498 (< beg
(setq beg
(match-end 0))))
5499 (while (progn (skip-chars-forward "^<>" beg
)
5501 (c-clear-<>-pair-props
)
5506 (when (or (looking-at "[<>]")
5507 (< (skip-chars-backward "<>") 0))
5510 (c-beginning-of-current-token)
5511 (when (and (< (point) end
)
5512 (looking-at c-
<>-multichar-token-regexp
)
5513 (< end
(setq end
(match-end 0))))
5514 (while (progn (skip-chars-forward "^<>" end
)
5516 (c-clear-<>-pair-props
)
5517 (forward-char)))))))
5521 ;; Handling of small scale constructs like types and names.
5523 ;; Dynamically bound variable that instructs `c-forward-type' to also
5524 ;; treat possible types (i.e. those that it normally returns 'maybe or
5525 ;; 'found for) as actual types (and always return 'found for them).
5526 ;; This means that it records them in `c-record-type-identifiers' if
5527 ;; that is set, and that it adds them to `c-found-types'.
5528 (defvar c-promote-possible-types nil
)
5530 ;; Dynamically bound variable that instructs `c-forward-<>-arglist' to
5531 ;; mark up successfully parsed arglists with paren syntax properties on
5532 ;; the surrounding angle brackets and with `c-<>-arg-sep' in the
5533 ;; `c-type' property of each argument separating comma.
5535 ;; Setting this variable also makes `c-forward-<>-arglist' recurse into
5536 ;; all arglists for side effects (i.e. recording types), otherwise it
5537 ;; exploits any existing paren syntax properties to quickly jump to the
5538 ;; end of already parsed arglists.
5540 ;; Marking up the arglists is not the default since doing that correctly
5541 ;; depends on a proper value for `c-restricted-<>-arglists'.
5542 (defvar c-parse-and-markup-
<>-arglists nil
)
5544 ;; Dynamically bound variable that instructs `c-forward-<>-arglist' to
5545 ;; not accept arglists that contain binary operators.
5547 ;; This is primarily used to handle C++ template arglists. C++
5548 ;; disambiguates them by checking whether the preceding name is a
5549 ;; template or not. We can't do that, so we assume it is a template
5550 ;; if it can be parsed as one. That usually works well since
5551 ;; comparison expressions on the forms "a < b > c" or "a < b, c > d"
5552 ;; in almost all cases would be pointless.
5554 ;; However, in function arglists, e.g. in "foo (a < b, c > d)", we
5555 ;; should let the comma separate the function arguments instead. And
5556 ;; in a context where the value of the expression is taken, e.g. in
5557 ;; "if (a < b || c > d)", it's probably not a template.
5558 (defvar c-restricted-
<>-arglists nil
)
5560 ;; Dynamically bound variables that instructs
5561 ;; `c-forward-keyword-clause', `c-forward-<>-arglist',
5562 ;; `c-forward-name', `c-forward-type', `c-forward-decl-or-cast-1', and
5563 ;; `c-forward-label' to record the ranges of all the type and
5564 ;; reference identifiers they encounter. They will build lists on
5565 ;; these variables where each element is a cons of the buffer
5566 ;; positions surrounding each identifier. This recording is only
5567 ;; activated when `c-record-type-identifiers' is non-nil.
5569 ;; All known types that can't be identifiers are recorded, and also
5570 ;; other possible types if `c-promote-possible-types' is set.
5571 ;; Recording is however disabled inside angle bracket arglists that
5572 ;; are encountered inside names and other angle bracket arglists.
5573 ;; Such occurrences are taken care of by `c-font-lock-<>-arglists'
5576 ;; Only the names in C++ template style references (e.g. "tmpl" in
5577 ;; "tmpl<a,b>::foo") are recorded as references, other references
5578 ;; aren't handled here.
5580 ;; `c-forward-label' records the label identifier(s) on
5581 ;; `c-record-ref-identifiers'.
5582 (defvar c-record-type-identifiers nil
)
5583 (defvar c-record-ref-identifiers nil
)
5585 ;; This variable will receive a cons cell of the range of the last
5586 ;; single identifier symbol stepped over by `c-forward-name' if it's
5587 ;; successful. This is the range that should be put on one of the
5588 ;; record lists above by the caller. It's assigned nil if there's no
5589 ;; such symbol in the name.
5590 (defvar c-last-identifier-range nil
)
5592 (defmacro c-record-type-id
(range)
5593 (if (eq (car-safe range
) 'cons
)
5595 `(setq c-record-type-identifiers
5596 (cons ,range c-record-type-identifiers
))
5597 `(let ((range ,range
))
5599 (setq c-record-type-identifiers
5600 (cons range c-record-type-identifiers
))))))
5602 (defmacro c-record-ref-id
(range)
5603 (if (eq (car-safe range
) 'cons
)
5605 `(setq c-record-ref-identifiers
5606 (cons ,range c-record-ref-identifiers
))
5607 `(let ((range ,range
))
5609 (setq c-record-ref-identifiers
5610 (cons range c-record-ref-identifiers
))))))
5612 ;; Dynamically bound variable that instructs `c-forward-type' to
5613 ;; record the ranges of types that only are found. Behaves otherwise
5614 ;; like `c-record-type-identifiers'.
5615 (defvar c-record-found-types nil
)
5617 (defmacro c-forward-keyword-prefixed-id
(type)
5618 ;; Used internally in `c-forward-keyword-clause' to move forward
5619 ;; over a type (if TYPE is 'type) or a name (otherwise) which
5620 ;; possibly is prefixed by keywords and their associated clauses.
5621 ;; Try with a type/name first to not trip up on those that begin
5622 ;; with a keyword. Return t if a known or found type is moved
5623 ;; over. The point is clobbered if nil is returned. If range
5624 ;; recording is enabled, the identifier is recorded on as a type
5625 ;; if TYPE is 'type or as a reference if TYPE is 'ref.
5627 ;; This macro might do hidden buffer changes.
5629 (while (if (setq res
,(if (eq type
'type
)
5633 (and (looking-at c-keywords-regexp
)
5634 (c-forward-keyword-clause 1))))
5635 (when (memq res
'(t known found prefix
))
5636 ,(when (eq type
'ref
)
5637 `(when c-record-type-identifiers
5638 (c-record-ref-id c-last-identifier-range
)))
5641 (defmacro c-forward-id-comma-list
(type update-safe-pos
)
5642 ;; Used internally in `c-forward-keyword-clause' to move forward
5643 ;; over a comma separated list of types or names using
5644 ;; `c-forward-keyword-prefixed-id'.
5646 ;; This macro might do hidden buffer changes.
5648 ,(when update-safe-pos
5649 `(setq safe-pos
(point)))
5650 (eq (char-after) ?
,))
5653 (c-forward-syntactic-ws)
5654 (c-forward-keyword-prefixed-id ,type
)))))
5656 (defun c-forward-keyword-clause (match)
5657 ;; Submatch MATCH in the current match data is assumed to surround a
5658 ;; token. If it's a keyword, move over it and any immediately
5659 ;; following clauses associated with it, stopping at the start of
5660 ;; the next token. t is returned in that case, otherwise the point
5661 ;; stays and nil is returned. The kind of clauses that are
5662 ;; recognized are those specified by `c-type-list-kwds',
5663 ;; `c-ref-list-kwds', `c-colon-type-list-kwds',
5664 ;; `c-paren-nontype-kwds', `c-paren-type-kwds', `c-<>-type-kwds',
5665 ;; and `c-<>-arglist-kwds'.
5667 ;; This function records identifier ranges on
5668 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5669 ;; `c-record-type-identifiers' is non-nil.
5671 ;; Note that for `c-colon-type-list-kwds', which doesn't necessary
5672 ;; apply directly after the keyword, the type list is moved over
5673 ;; only when there is no unaccounted token before it (i.e. a token
5674 ;; that isn't moved over due to some other keyword list). The
5675 ;; identifier ranges in the list are still recorded if that should
5678 ;; This function might do hidden buffer changes.
5680 (let ((kwd-sym (c-keyword-sym (match-string match
))) safe-pos pos
5681 ;; The call to `c-forward-<>-arglist' below is made after
5682 ;; `c-<>-sexp-kwds' keywords, so we're certain they actually
5683 ;; are angle bracket arglists and `c-restricted-<>-arglists'
5684 ;; should therefore be nil.
5685 (c-parse-and-markup-<>-arglists t
)
5686 c-restricted-
<>-arglists
)
5689 (goto-char (match-end match
))
5690 (c-forward-syntactic-ws)
5691 (setq safe-pos
(point))
5694 ((and (c-keyword-member kwd-sym
'c-type-list-kwds
)
5695 (c-forward-keyword-prefixed-id type
))
5696 ;; There's a type directly after a keyword in `c-type-list-kwds'.
5697 (c-forward-id-comma-list type t
))
5699 ((and (c-keyword-member kwd-sym
'c-ref-list-kwds
)
5700 (c-forward-keyword-prefixed-id ref
))
5701 ;; There's a name directly after a keyword in `c-ref-list-kwds'.
5702 (c-forward-id-comma-list ref t
))
5704 ((and (c-keyword-member kwd-sym
'c-paren-any-kwds
)
5705 (eq (char-after) ?\
())
5706 ;; There's an open paren after a keyword in `c-paren-any-kwds'.
5709 (when (and (setq pos
(c-up-list-forward))
5710 (eq (char-before pos
) ?\
)))
5711 (when (and c-record-type-identifiers
5712 (c-keyword-member kwd-sym
'c-paren-type-kwds
))
5713 ;; Use `c-forward-type' on every identifier we can find
5714 ;; inside the paren, to record the types.
5715 (while (c-syntactic-re-search-forward c-symbol-start pos t
)
5716 (goto-char (match-beginning 0))
5717 (unless (c-forward-type)
5718 (looking-at c-symbol-key
) ; Always matches.
5719 (goto-char (match-end 0)))))
5722 (c-forward-syntactic-ws)
5723 (setq safe-pos
(point))))
5725 ((and (c-keyword-member kwd-sym
'c-
<>-sexp-kwds
)
5726 (eq (char-after) ?
<)
5727 (c-forward-<>-arglist
(c-keyword-member kwd-sym
'c-
<>-type-kwds
)))
5728 (c-forward-syntactic-ws)
5729 (setq safe-pos
(point)))
5731 ((and (c-keyword-member kwd-sym
'c-nonsymbol-sexp-kwds
)
5732 (not (looking-at c-symbol-start
))
5733 (c-safe (c-forward-sexp) t
))
5734 (c-forward-syntactic-ws)
5735 (setq safe-pos
(point))))
5737 (when (c-keyword-member kwd-sym
'c-colon-type-list-kwds
)
5738 (if (eq (char-after) ?
:)
5739 ;; If we are at the colon already, we move over the type
5743 (c-forward-syntactic-ws)
5744 (when (c-forward-keyword-prefixed-id type
)
5745 (c-forward-id-comma-list type t
)))
5746 ;; Not at the colon, so stop here. But the identifier
5747 ;; ranges in the type list later on should still be
5749 (and c-record-type-identifiers
5751 ;; If a keyword matched both one of the types above and
5752 ;; this one, we match `c-colon-type-list-re' after the
5753 ;; clause matched above.
5754 (goto-char safe-pos
)
5755 (looking-at c-colon-type-list-re
))
5757 (goto-char (match-end 0))
5758 (c-forward-syntactic-ws)
5759 (c-forward-keyword-prefixed-id type
))
5760 ;; There's a type after the `c-colon-type-list-re' match
5761 ;; after a keyword in `c-colon-type-list-kwds'.
5762 (c-forward-id-comma-list type nil
))))
5764 (goto-char safe-pos
)
5767 ;; cc-mode requires cc-fonts.
5768 (declare-function c-fontify-recorded-types-and-refs
"cc-fonts" ())
5770 (defun c-forward-<>-arglist
(all-types)
5771 ;; The point is assumed to be at a "<". Try to treat it as the open
5772 ;; paren of an angle bracket arglist and move forward to the
5773 ;; corresponding ">". If successful, the point is left after the
5774 ;; ">" and t is returned, otherwise the point isn't moved and nil is
5775 ;; returned. If ALL-TYPES is t then all encountered arguments in
5776 ;; the arglist that might be types are treated as found types.
5778 ;; The variable `c-parse-and-markup-<>-arglists' controls how this
5779 ;; function handles text properties on the angle brackets and argument
5780 ;; separating commas.
5782 ;; `c-restricted-<>-arglists' controls how lenient the template
5783 ;; arglist recognition should be.
5785 ;; This function records identifier ranges on
5786 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5787 ;; `c-record-type-identifiers' is non-nil.
5789 ;; This function might do hidden buffer changes.
5791 (let ((start (point))
5792 ;; If `c-record-type-identifiers' is set then activate
5793 ;; recording of any found types that constitute an argument in
5795 (c-record-found-types (if c-record-type-identifiers t
)))
5796 (if (catch 'angle-bracket-arglist-escape
5797 (setq c-record-found-types
5798 (c-forward-<>-arglist-recur all-types
)))
5800 (when (consp c-record-found-types
)
5801 (setq c-record-type-identifiers
5802 ;; `nconc' doesn't mind that the tail of
5803 ;; `c-record-found-types' is t.
5804 (nconc c-record-found-types c-record-type-identifiers
)))
5805 (if (c-major-mode-is 'java-mode
) (c-fontify-recorded-types-and-refs))
5811 (defun c-forward-<>-arglist-recur
(all-types)
5812 ;; Recursive part of `c-forward-<>-arglist'.
5814 ;; This function might do hidden buffer changes.
5816 (let ((start (point)) res pos tmp
5817 ;; Cover this so that any recorded found type ranges are
5818 ;; automatically lost if it turns out to not be an angle
5819 ;; bracket arglist. It's propagated through the return value
5820 ;; on successful completion.
5821 (c-record-found-types c-record-found-types
)
5822 ;; List that collects the positions after the argument
5823 ;; separating ',' in the arglist.
5825 ;; If the '<' has paren open syntax then we've marked it as an angle
5826 ;; bracket arglist before, so skip to the end.
5827 (if (and (not c-parse-and-markup-
<>-arglists
)
5828 (c-get-char-property (point) 'syntax-table
))
5832 (if (and (c-go-up-list-forward)
5833 (eq (char-before) ?
>))
5835 ;; Got unmatched paren angle brackets. We don't clear the paren
5836 ;; syntax properties and retry, on the basis that it's very
5837 ;; unlikely that paren angle brackets become operators by code
5838 ;; manipulation. It's far more likely that it doesn't match due
5839 ;; to narrowing or some temporary change.
5843 (forward-char) ; Forward over the opening '<'.
5845 (unless (looking-at c-
<-op-cont-regexp
)
5846 ;; go forward one non-alphanumeric character (group) per iteration of
5850 (c-forward-syntactic-ws)
5851 (let ((orig-record-found-types c-record-found-types
))
5852 (when (or (and c-record-type-identifiers all-types
)
5853 (c-major-mode-is 'java-mode
))
5854 ;; All encountered identifiers are types, so set the
5855 ;; promote flag and parse the type.
5857 (c-forward-syntactic-ws)
5858 (if (looking-at "\\?")
5860 (when (looking-at c-identifier-start
)
5861 (let ((c-promote-possible-types t
)
5862 (c-record-found-types t
))
5865 (c-forward-syntactic-ws)
5867 (when (or (looking-at "extends")
5868 (looking-at "super"))
5870 (c-forward-syntactic-ws)
5871 (let ((c-promote-possible-types t
)
5872 (c-record-found-types t
))
5874 (c-forward-syntactic-ws))))))
5876 (setq pos
(point)) ; e.g. first token inside the '<'
5878 ;; Note: These regexps exploit the match order in \| so
5879 ;; that "<>" is matched by "<" rather than "[^>:-]>".
5880 (c-syntactic-re-search-forward
5881 ;; Stop on ',', '|', '&', '+' and '-' to catch
5882 ;; common binary operators that could be between
5883 ;; two comparison expressions "a<b" and "c>d".
5884 "[<;{},|+&-]\\|[>)]"
5888 ((eq (char-before) ?
>)
5889 ;; Either an operator starting with '>' or the end of
5890 ;; the angle bracket arglist.
5892 (if (looking-at c-
>-op-cont-regexp
)
5894 (goto-char (match-end 0))
5895 t
) ; Continue the loop.
5897 ;; The angle bracket arglist is finished.
5898 (when c-parse-and-markup-
<>-arglists
5899 (while arg-start-pos
5900 (c-put-c-type-property (1- (car arg-start-pos
))
5902 (setq arg-start-pos
(cdr arg-start-pos
)))
5903 (c-mark-<-as-paren start
)
5904 (c-mark->-as-paren
(1- (point))))
5906 nil
)) ; Exit the loop.
5908 ((eq (char-before) ?
<)
5909 ;; Either an operator starting with '<' or a nested arglist.
5911 (let (id-start id-end subres keyword-match
)
5913 ;; The '<' begins a multi-char operator.
5914 ((looking-at c-
<-op-cont-regexp
)
5915 (setq tmp
(match-end 0))
5916 (goto-char (match-end 0)))
5917 ;; We're at a nested <.....>
5920 (backward-char) ; to the '<'
5923 ;; There's always an identifier before an angle
5924 ;; bracket arglist, or a keyword in `c-<>-type-kwds'
5925 ;; or `c-<>-arglist-kwds'.
5926 (c-backward-syntactic-ws)
5927 (setq id-end
(point))
5928 (c-simple-skip-symbol-backward)
5929 (when (or (setq keyword-match
5930 (looking-at c-opt-
<>-sexp-key
))
5931 (not (looking-at c-keywords-regexp
)))
5932 (setq id-start
(point))))
5934 (let ((c-promote-possible-types t
)
5935 (c-record-found-types t
))
5936 (c-forward-<>-arglist-recur
5939 (c-keyword-sym (match-string 1))
5940 'c-
<>-type-kwds
)))))))
5942 ;; It was an angle bracket arglist.
5943 (setq c-record-found-types subres
)
5945 ;; Record the identifier before the template as a type
5946 ;; or reference depending on whether the arglist is last
5947 ;; in a qualified identifier.
5948 (when (and c-record-type-identifiers
5949 (not keyword-match
))
5950 (if (and c-opt-identifier-concat-key
5952 (c-forward-syntactic-ws)
5953 (looking-at c-opt-identifier-concat-key
)))
5954 (c-record-ref-id (cons id-start id-end
))
5955 (c-record-type-id (cons id-start id-end
)))))
5957 ;; At a "less than" operator.
5961 t
) ; carry on looping.
5963 ((and (not c-restricted-
<>-arglists
)
5964 (or (and (eq (char-before) ?
&)
5965 (not (eq (char-after) ?
&)))
5966 (eq (char-before) ?
,)))
5967 ;; Just another argument. Record the position. The
5968 ;; type check stuff that made us stop at it is at
5969 ;; the top of the loop.
5970 (setq arg-start-pos
(cons (point) arg-start-pos
)))
5973 ;; Got a character that can't be in an angle bracket
5974 ;; arglist argument. Abort using `throw', since
5975 ;; it's useless to try to find a surrounding arglist
5977 (throw 'angle-bracket-arglist-escape nil
))))))
5979 (or c-record-found-types t
)))))
5981 (defun c-backward-<>-arglist
(all-types &optional limit
)
5982 ;; The point is assumed to be directly after a ">". Try to treat it
5983 ;; as the close paren of an angle bracket arglist and move back to
5984 ;; the corresponding "<". If successful, the point is left at
5985 ;; the "<" and t is returned, otherwise the point isn't moved and
5986 ;; nil is returned. ALL-TYPES is passed on to
5987 ;; `c-forward-<>-arglist'.
5989 ;; If the optional LIMIT is given, it bounds the backward search.
5990 ;; It's then assumed to be at a syntactically relevant position.
5992 ;; This is a wrapper around `c-forward-<>-arglist'. See that
5993 ;; function for more details.
5995 (let ((start (point)))
5997 (if (and (not c-parse-and-markup-
<>-arglists
)
5998 (c-get-char-property (point) 'syntax-table
))
6000 (if (and (c-go-up-list-backward)
6001 (eq (char-after) ?
<))
6003 ;; See corresponding note in `c-forward-<>-arglist'.
6008 (c-syntactic-skip-backward "^<;{}" limit t
)
6011 (if (eq (char-before) ?
<)
6013 ;; Stopped at bob or a char that isn't allowed in an
6014 ;; arglist, so we've failed.
6019 (progn (c-beginning-of-current-token)
6021 ;; If we moved then the "<" was part of some
6022 ;; multicharacter token.
6026 (let ((beg-pos (point)))
6027 (if (c-forward-<>-arglist all-types
)
6028 (cond ((= (point) start
)
6029 ;; Matched the arglist. Break the while.
6033 ;; We started from a non-paren ">" inside an
6038 ;; Matched a shorter arglist. Can be a nested
6039 ;; one so continue looking.
6044 (/= (point) start
))))
6046 (defun c-forward-name ()
6047 ;; Move forward over a complete name if at the beginning of one,
6048 ;; stopping at the next following token. A keyword, as such,
6049 ;; doesn't count as a name. If the point is not at something that
6050 ;; is recognized as a name then it stays put.
6052 ;; A name could be something as simple as "foo" in C or something as
6053 ;; complex as "X<Y<class A<int>::B, BIT_MAX >> b>, ::operator<> ::
6054 ;; Z<(a>b)> :: operator const X<&foo>::T Q::G<unsigned short
6055 ;; int>::*volatile const" in C++ (this function is actually little
6056 ;; more than a `looking-at' call in all modes except those that,
6057 ;; like C++, have `c-recognize-<>-arglists' set).
6060 ;; o - nil if no name is found;
6061 ;; o - 'template if it's an identifier ending with an angle bracket
6063 ;; o - 'operator of it's an operator identifier;
6064 ;; o - t if it's some other kind of name.
6066 ;; This function records identifier ranges on
6067 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
6068 ;; `c-record-type-identifiers' is non-nil.
6070 ;; This function might do hidden buffer changes.
6072 (let ((pos (point)) (start (point)) res id-start id-end
6073 ;; Turn off `c-promote-possible-types' here since we might
6074 ;; call `c-forward-<>-arglist' and we don't want it to promote
6075 ;; every suspect thing in the arglist to a type. We're
6076 ;; typically called from `c-forward-type' in this case, and
6077 ;; the caller only wants the top level type that it finds to
6079 c-promote-possible-types
)
6082 (looking-at c-identifier-key
)
6085 ;; Check for keyword. We go to the last symbol in
6086 ;; `c-identifier-key' first.
6087 (goto-char (setq id-end
(match-end 0)))
6088 (c-simple-skip-symbol-backward)
6089 (setq id-start
(point))
6091 (if (looking-at c-keywords-regexp
)
6092 (when (and (c-major-mode-is 'c
++-mode
)
6094 (cc-eval-when-compile
6095 (concat "\\(operator\\|\\(template\\)\\)"
6096 "\\(" (c-lang-const c-nonsymbol-key c
++)
6098 (if (match-beginning 2)
6099 ;; "template" is only valid inside an
6100 ;; identifier if preceded by "::".
6102 (c-backward-syntactic-ws)
6103 (and (c-safe (backward-char 2) t
)
6107 ;; Handle a C++ operator or template identifier.
6109 (c-forward-syntactic-ws)
6110 (cond ((eq (char-before id-end
) ?e
)
6111 ;; Got "... ::template".
6112 (let ((subres (c-forward-name)))
6117 ((looking-at c-identifier-start
)
6118 ;; Got a cast operator.
6119 (when (c-forward-type)
6122 ;; Now we should match a sequence of either
6123 ;; '*', '&' or a name followed by ":: *",
6124 ;; where each can be followed by a sequence
6125 ;; of `c-opt-type-modifier-key'.
6126 (while (cond ((looking-at "[*&]")
6127 (goto-char (match-end 0))
6129 ((looking-at c-identifier-start
)
6130 (and (c-forward-name)
6133 (goto-char (match-end 0))
6134 (c-forward-syntactic-ws)
6135 (eq (char-after) ?
*))
6140 (c-forward-syntactic-ws)
6142 (looking-at c-opt-type-modifier-key
))
6143 (goto-char (match-end 1))))))
6145 ((looking-at c-overloadable-operators-regexp
)
6146 ;; Got some other operator.
6147 (setq c-last-identifier-range
6148 (cons (point) (match-end 0)))
6149 (goto-char (match-end 0))
6150 (c-forward-syntactic-ws)
6156 ;; `id-start' is equal to `id-end' if we've jumped over
6157 ;; an identifier that doesn't end with a symbol token.
6158 ;; That can occur e.g. for Java import directives on the
6159 ;; form "foo.bar.*".
6160 (when (and id-start
(/= id-start id-end
))
6161 (setq c-last-identifier-range
6162 (cons id-start id-end
)))
6164 (c-forward-syntactic-ws)
6170 (when (or c-opt-identifier-concat-key
6171 c-recognize-
<>-arglists
)
6174 ((and c-opt-identifier-concat-key
6175 (looking-at c-opt-identifier-concat-key
))
6176 ;; Got a concatenated identifier. This handles the
6177 ;; cases with tricky syntactic whitespace that aren't
6178 ;; covered in `c-identifier-key'.
6179 (goto-char (match-end 0))
6180 (c-forward-syntactic-ws)
6183 ((and c-recognize-
<>-arglists
6184 (eq (char-after) ?
<))
6185 ;; Maybe an angle bracket arglist.
6186 (when (let ((c-record-type-identifiers t
)
6187 (c-record-found-types t
))
6188 (c-forward-<>-arglist nil
))
6190 (c-add-type start
(1+ pos
))
6191 (c-forward-syntactic-ws)
6193 c-last-identifier-range nil
)
6195 (if (and c-opt-identifier-concat-key
6196 (looking-at c-opt-identifier-concat-key
))
6198 ;; Continue if there's an identifier concatenation
6199 ;; operator after the template argument.
6201 (when (and c-record-type-identifiers id-start
)
6202 (c-record-ref-id (cons id-start id-end
)))
6204 (c-forward-syntactic-ws)
6207 (when (and c-record-type-identifiers id-start
)
6208 (c-record-type-id (cons id-start id-end
)))
6209 (setq res
'template
)
6216 (defun c-forward-type (&optional brace-block-too
)
6217 ;; Move forward over a type spec if at the beginning of one,
6218 ;; stopping at the next following token. The keyword "typedef"
6219 ;; isn't part of a type spec here.
6221 ;; BRACE-BLOCK-TOO, when non-nil, means move over the brace block in
6222 ;; constructs like "struct foo {...} bar ;" or "struct {...} bar;".
6223 ;; The current (2009-03-10) intention is to convert all uses of
6224 ;; `c-forward-type' to call with this parameter set, then to
6228 ;; o - t if it's a known type that can't be a name or other
6230 ;; o - 'known if it's an otherwise known type (according to
6231 ;; `*-font-lock-extra-types');
6232 ;; o - 'prefix if it's a known prefix of a type;
6233 ;; o - 'found if it's a type that matches one in `c-found-types';
6234 ;; o - 'maybe if it's an identifier that might be a type; or
6235 ;; o - nil if it can't be a type (the point isn't moved then).
6237 ;; The point is assumed to be at the beginning of a token.
6239 ;; Note that this function doesn't skip past the brace definition
6240 ;; that might be considered part of the type, e.g.
6241 ;; "enum {a, b, c} foo".
6243 ;; This function records identifier ranges on
6244 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
6245 ;; `c-record-type-identifiers' is non-nil.
6247 ;; This function might do hidden buffer changes.
6248 (when (and c-recognize-
<>-arglists
6250 (c-forward-<>-arglist t
)
6251 (c-forward-syntactic-ws))
6253 (let ((start (point)) pos res name-res id-start id-end id-range
)
6255 ;; Skip leading type modifiers. If any are found we know it's a
6256 ;; prefix of a type.
6257 (when c-opt-type-modifier-key
; e.g. "const" "volatile", but NOT "typedef"
6258 (while (looking-at c-opt-type-modifier-key
)
6259 (goto-char (match-end 1))
6260 (c-forward-syntactic-ws)
6261 (setq res
'prefix
)))
6264 ((looking-at c-type-prefix-key
) ; e.g. "struct", "class", but NOT
6266 (goto-char (match-end 1))
6267 (c-forward-syntactic-ws)
6270 (setq name-res
(c-forward-name))
6271 (setq res
(not (null name-res
)))
6272 (when (eq name-res t
)
6273 ;; In many languages the name can be used without the
6274 ;; prefix, so we add it to `c-found-types'.
6275 (c-add-type pos
(point))
6276 (when (and c-record-type-identifiers
6277 c-last-identifier-range
)
6278 (c-record-type-id c-last-identifier-range
)))
6279 (when (and brace-block-too
6281 (eq (char-after) ?\
{)
6284 (progn (c-forward-sexp)
6285 (c-forward-syntactic-ws)
6286 (setq pos
(point))))))
6289 (unless res
(goto-char start
))) ; invalid syntax
6293 (if (looking-at c-identifier-start
)
6295 (setq id-start
(point)
6296 name-res
(c-forward-name))
6298 (setq id-end
(point)
6299 id-range c-last-identifier-range
))))
6300 (and (cond ((looking-at c-primitive-type-key
)
6302 ((c-with-syntax-table c-identifier-syntax-table
6303 (looking-at c-known-type-key
))
6308 (goto-char (match-end 1))
6309 (c-forward-syntactic-ws)
6310 (setq pos
(point))))
6313 ;; Looking at a primitive or known type identifier. We've
6314 ;; checked for a name first so that we don't go here if the
6315 ;; known type match only is a prefix of another name.
6317 (setq id-end
(match-end 1))
6319 (when (and c-record-type-identifiers
6320 (or c-promote-possible-types
(eq res t
)))
6321 (c-record-type-id (cons (match-beginning 1) (match-end 1))))
6323 (if (and c-opt-type-component-key
6325 (looking-at c-opt-type-component-key
)))
6326 ;; There might be more keywords for the type.
6328 (c-forward-keyword-clause 1)
6330 (setq safe-pos
(point))
6331 (looking-at c-opt-type-component-key
))
6332 (when (and c-record-type-identifiers
6333 (looking-at c-primitive-type-key
))
6334 (c-record-type-id (cons (match-beginning 1)
6336 (c-forward-keyword-clause 1))
6337 (if (looking-at c-primitive-type-key
)
6339 (when c-record-type-identifiers
6340 (c-record-type-id (cons (match-beginning 1)
6342 (c-forward-keyword-clause 1)
6344 (goto-char safe-pos
)
6345 (setq res
'prefix
)))
6346 (unless (save-match-data (c-forward-keyword-clause 1))
6349 (goto-char (match-end 1))
6350 (c-forward-syntactic-ws)))))
6353 (cond ((eq name-res t
)
6354 ;; A normal identifier.
6356 (if (or res c-promote-possible-types
)
6358 (c-add-type id-start id-end
)
6359 (when (and c-record-type-identifiers id-range
)
6360 (c-record-type-id id-range
))
6363 (setq res
(if (c-check-type id-start id-end
)
6364 ;; It's an identifier that has been used as
6365 ;; a type somewhere else.
6367 ;; It's an identifier that might be a type.
6369 ((eq name-res
'template
)
6370 ;; A template is a type.
6374 ;; Otherwise it's an operator identifier, which is not a type.
6379 ;; Skip trailing type modifiers. If any are found we know it's
6381 (when c-opt-type-modifier-key
6382 (while (looking-at c-opt-type-modifier-key
) ; e.g. "const", "volatile"
6383 (goto-char (match-end 1))
6384 (c-forward-syntactic-ws)
6386 ;; Step over any type suffix operator. Do not let the existence
6387 ;; of these alter the classification of the found type, since
6388 ;; these operators typically are allowed in normal expressions
6390 (when c-opt-type-suffix-key
6391 (while (looking-at c-opt-type-suffix-key
)
6392 (goto-char (match-end 1))
6393 (c-forward-syntactic-ws)))
6395 (when c-opt-type-concat-key
; Only/mainly for pike.
6396 ;; Look for a trailing operator that concatenates the type
6397 ;; with a following one, and if so step past that one through
6398 ;; a recursive call. Note that we don't record concatenated
6399 ;; types in `c-found-types' - it's the component types that
6400 ;; are recorded when appropriate.
6402 (let* ((c-promote-possible-types (or (memq res
'(t known
))
6403 c-promote-possible-types
))
6404 ;; If we can't promote then set `c-record-found-types' so that
6405 ;; we can merge in the types from the second part afterwards if
6406 ;; it turns out to be a known type there.
6407 (c-record-found-types (and c-record-type-identifiers
6408 (not c-promote-possible-types
)))
6410 (if (and (looking-at c-opt-type-concat-key
)
6413 (goto-char (match-end 1))
6414 (c-forward-syntactic-ws)
6415 (setq subres
(c-forward-type))))
6418 ;; If either operand certainly is a type then both are, but we
6419 ;; don't let the existence of the operator itself promote two
6420 ;; uncertain types to a certain one.
6423 (unless (eq name-res
'template
)
6424 (c-add-type id-start id-end
))
6425 (when (and c-record-type-identifiers id-range
)
6426 (c-record-type-id id-range
))
6437 (when (and (eq res t
)
6438 (consp c-record-found-types
))
6439 ;; Merge in the ranges of any types found by the second
6440 ;; `c-forward-type'.
6441 (setq c-record-type-identifiers
6442 ;; `nconc' doesn't mind that the tail of
6443 ;; `c-record-found-types' is t.
6444 (nconc c-record-found-types
6445 c-record-type-identifiers
))))
6449 (when (and c-record-found-types
(memq res
'(known found
)) id-range
)
6450 (setq c-record-found-types
6451 (cons id-range c-record-found-types
))))
6453 ;;(message "c-forward-type %s -> %s: %s" start (point) res)
6457 (defun c-forward-annotation ()
6458 ;; Used for Java code only at the moment. Assumes point is on the
6459 ;; @, moves forward an annotation. returns nil if there is no
6460 ;; annotation at point.
6461 (and (looking-at "@")
6462 (progn (forward-char) t
)
6464 (progn (c-forward-syntactic-ws) t
)
6465 (if (looking-at "(")
6470 ;; Handling of large scale constructs like statements and declarations.
6472 ;; Macro used inside `c-forward-decl-or-cast-1'. It ought to be a
6473 ;; defsubst or perhaps even a defun, but it contains lots of free
6474 ;; variables that refer to things inside `c-forward-decl-or-cast-1'.
6475 (defmacro c-fdoc-shift-type-backward
(&optional short
)
6476 ;; `c-forward-decl-or-cast-1' can consume an arbitrary length list
6477 ;; of types when parsing a declaration, which means that it
6478 ;; sometimes consumes the identifier in the declaration as a type.
6479 ;; This is used to "backtrack" and make the last type be treated as
6480 ;; an identifier instead.
6483 ;; These identifiers are bound only in the inner let.
6484 '(setq identifier-type at-type
6485 identifier-start type-start
6489 got-suffix-after-parens id-start
6492 (if (setq at-type
(if (eq backup-at-type
'prefix
)
6495 (setq type-start backup-type-start
6496 id-start backup-id-start
)
6497 (setq type-start start-pos
6498 id-start start-pos
))
6500 ;; When these flags already are set we've found specifiers that
6501 ;; unconditionally signal these attributes - backtracking doesn't
6502 ;; change that. So keep them set in that case.
6504 (setq at-type-decl backup-at-type-decl
))
6506 (setq maybe-typeless backup-maybe-typeless
))
6509 ;; This identifier is bound only in the inner let.
6510 '(setq start id-start
))))
6512 (defun c-forward-decl-or-cast-1 (preceding-token-end context last-cast-end
)
6513 ;; Move forward over a declaration or a cast if at the start of one.
6514 ;; The point is assumed to be at the start of some token. Nil is
6515 ;; returned if no declaration or cast is recognized, and the point
6516 ;; is clobbered in that case.
6518 ;; If a declaration is parsed:
6520 ;; The point is left at the first token after the first complete
6521 ;; declarator, if there is one. The return value is a cons where
6522 ;; the car is the position of the first token in the declarator. (See
6523 ;; below for the cdr.)
6526 ;; void foo (int a, char *b) stuff ...
6530 ;; unsigned int a = c_style_initializer, b;
6532 ;; unsigned int a (cplusplus_style_initializer), b;
6533 ;; car ^ ^ point (might change)
6534 ;; class Foo : public Bar {}
6536 ;; class PikeClass (int a, string b) stuff ...
6542 ;; void cplusplus_function (int x) throw (Bad);
6544 ;; Foo::Foo (int b) : Base (b) {}
6547 ;; The cdr of the return value is non-nil when a
6548 ;; `c-typedef-decl-kwds' specifier is found in the declaration.
6549 ;; Specifically it is a dotted pair (A . B) where B is t when a
6550 ;; `c-typedef-kwds' ("typedef") is present, and A is t when some
6551 ;; other `c-typedef-decl-kwds' (e.g. class, struct, enum)
6552 ;; specifier is present. I.e., (some of) the declared
6553 ;; identifier(s) are types.
6555 ;; If a cast is parsed:
6557 ;; The point is left at the first token after the closing paren of
6558 ;; the cast. The return value is `cast'. Note that the start
6559 ;; position must be at the first token inside the cast parenthesis
6562 ;; PRECEDING-TOKEN-END is the first position after the preceding
6563 ;; token, i.e. on the other side of the syntactic ws from the point.
6564 ;; Use a value less than or equal to (point-min) if the point is at
6565 ;; the first token in (the visible part of) the buffer.
6567 ;; CONTEXT is a symbol that describes the context at the point:
6568 ;; 'decl In a comma-separated declaration context (typically
6569 ;; inside a function declaration arglist).
6570 ;; '<> In an angle bracket arglist.
6571 ;; 'arglist Some other type of arglist.
6572 ;; nil Some other context or unknown context. Includes
6573 ;; within the parens of an if, for, ... construct.
6575 ;; LAST-CAST-END is the first token after the closing paren of a
6576 ;; preceding cast, or nil if none is known. If
6577 ;; `c-forward-decl-or-cast-1' is used in succession, it should be
6578 ;; the position after the closest preceding call where a cast was
6579 ;; matched. In that case it's used to discover chains of casts like
6582 ;; This function records identifier ranges on
6583 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
6584 ;; `c-record-type-identifiers' is non-nil.
6586 ;; This function might do hidden buffer changes.
6588 (let (;; `start-pos' is used below to point to the start of the
6589 ;; first type, i.e. after any leading specifiers. It might
6590 ;; also point at the beginning of the preceding syntactic
6593 ;; Set to the result of `c-forward-type'.
6595 ;; The position of the first token in what we currently
6596 ;; believe is the type in the declaration or cast, after any
6597 ;; specifiers and their associated clauses.
6599 ;; The position of the first token in what we currently
6600 ;; believe is the declarator for the first identifier. Set
6601 ;; when the type is found, and moved forward over any
6602 ;; `c-decl-hangon-kwds' and their associated clauses that
6603 ;; occurs after the type.
6605 ;; These store `at-type', `type-start' and `id-start' of the
6606 ;; identifier before the one in those variables. The previous
6607 ;; identifier might turn out to be the real type in a
6608 ;; declaration if the last one has to be the declarator in it.
6609 ;; If `backup-at-type' is nil then the other variables have
6610 ;; undefined values.
6611 backup-at-type backup-type-start backup-id-start
6612 ;; Set if we've found a specifier (apart from "typedef") that makes
6613 ;; the defined identifier(s) types.
6615 ;; Set if we've a "typedef" keyword.
6617 ;; Set if we've found a specifier that can start a declaration
6618 ;; where there's no type.
6620 ;; If a specifier is found that also can be a type prefix,
6621 ;; these flags are set instead of those above. If we need to
6622 ;; back up an identifier, they are copied to the real flag
6623 ;; variables. Thus they only take effect if we fail to
6624 ;; interpret it as a type.
6625 backup-at-type-decl backup-maybe-typeless
6626 ;; Whether we've found a declaration or a cast. We might know
6627 ;; this before we've found the type in it. It's 'ids if we've
6628 ;; found two consecutive identifiers (usually a sure sign, but
6629 ;; we should allow that in labels too), and t if we've found a
6630 ;; specifier keyword (a 100% sure sign).
6632 ;; Set when we need to back up to parse this as a declaration
6633 ;; but not as a cast.
6635 ;; For casts, the return position.
6637 ;; Save `c-record-type-identifiers' and
6638 ;; `c-record-ref-identifiers' since ranges are recorded
6639 ;; speculatively and should be thrown away if it turns out
6640 ;; that it isn't a declaration or cast.
6641 (save-rec-type-ids c-record-type-identifiers
)
6642 (save-rec-ref-ids c-record-ref-identifiers
))
6644 (while (c-forward-annotation)
6645 (c-forward-syntactic-ws))
6647 ;; Check for a type. Unknown symbols are treated as possible
6648 ;; types, but they could also be specifiers disguised through
6649 ;; macros like __INLINE__, so we recognize both types and known
6650 ;; specifiers after them too.
6652 (let* ((start (point)) kwd-sym kwd-clause-end found-type
)
6654 ;; Look for a specifier keyword clause.
6655 (when (or (looking-at c-prefix-spec-kwds-re
)
6656 (and (c-major-mode-is 'java-mode
)
6657 (looking-at "@[A-Za-z0-9]+")))
6658 (if (looking-at c-typedef-key
)
6659 (setq at-typedef t
))
6660 (setq kwd-sym
(c-keyword-sym (match-string 1)))
6662 (c-forward-keyword-clause 1)
6663 (setq kwd-clause-end
(point))))
6665 (when (setq found-type
(c-forward-type t
)) ; brace-block-too
6666 ;; Found a known or possible type or a prefix of a known type.
6669 ;; Got two identifiers with nothing but whitespace
6670 ;; between them. That can only happen in declarations.
6671 (setq at-decl-or-cast
'ids
)
6673 (when (eq at-type
'found
)
6674 ;; If the previous identifier is a found type we
6675 ;; record it as a real one; it might be some sort of
6676 ;; alias for a prefix like "unsigned".
6678 (goto-char type-start
)
6679 (let ((c-promote-possible-types t
))
6680 (c-forward-type)))))
6682 (setq backup-at-type at-type
6683 backup-type-start type-start
6684 backup-id-start id-start
6688 ;; The previous ambiguous specifier/type turned out
6689 ;; to be a type since we've parsed another one after
6690 ;; it, so clear these backup flags.
6691 backup-at-type-decl nil
6692 backup-maybe-typeless nil
))
6696 ;; Handle known specifier keywords and
6697 ;; `c-decl-hangon-kwds' which can occur after known
6700 (if (c-keyword-member kwd-sym
'c-decl-hangon-kwds
)
6701 ;; It's a hang-on keyword that can occur anywhere.
6703 (setq at-decl-or-cast t
)
6705 ;; Move the identifier start position if
6706 ;; we've passed a type.
6707 (setq id-start kwd-clause-end
)
6708 ;; Otherwise treat this as a specifier and
6709 ;; move the fallback position.
6710 (setq start-pos kwd-clause-end
))
6711 (goto-char kwd-clause-end
))
6713 ;; It's an ordinary specifier so we know that
6714 ;; anything before this can't be the type.
6715 (setq backup-at-type nil
6716 start-pos kwd-clause-end
)
6719 ;; It's ambiguous whether this keyword is a
6720 ;; specifier or a type prefix, so set the backup
6721 ;; flags. (It's assumed that `c-forward-type'
6722 ;; moved further than `c-forward-keyword-clause'.)
6724 (when (c-keyword-member kwd-sym
'c-typedef-decl-kwds
)
6725 (setq backup-at-type-decl t
))
6726 (when (c-keyword-member kwd-sym
'c-typeless-decl-kwds
)
6727 (setq backup-maybe-typeless t
)))
6729 (when (c-keyword-member kwd-sym
'c-typedef-decl-kwds
)
6730 ;; This test only happens after we've scanned a type.
6731 ;; So, with valid syntax, kwd-sym can't be 'typedef.
6732 (setq at-type-decl t
))
6733 (when (c-keyword-member kwd-sym
'c-typeless-decl-kwds
)
6734 (setq maybe-typeless t
))
6736 ;; Haven't matched a type so it's an unambiguous
6737 ;; specifier keyword and we know we're in a
6739 (setq at-decl-or-cast t
)
6741 (goto-char kwd-clause-end
))))
6743 ;; If the type isn't known we continue so that we'll jump
6744 ;; over all specifiers and type identifiers. The reason
6745 ;; to do this for a known type prefix is to make things
6746 ;; like "unsigned INT16" work.
6747 (and found-type
(not (eq found-type t
))))))
6751 ;; If a known type was found, we still need to skip over any
6752 ;; hangon keyword clauses after it. Otherwise it has already
6753 ;; been done in the loop above.
6754 (while (looking-at c-decl-hangon-key
)
6755 (c-forward-keyword-clause 1))
6756 (setq id-start
(point)))
6758 ((eq at-type
'prefix
)
6759 ;; A prefix type is itself a primitive type when it's not
6760 ;; followed by another type.
6764 ;; Got no type but set things up to continue anyway to handle
6765 ;; the various cases when a declaration doesn't start with a
6767 (setq id-start start-pos
))
6769 ((and (eq at-type
'maybe
)
6770 (c-major-mode-is 'c
++-mode
))
6771 ;; If it's C++ then check if the last "type" ends on the form
6772 ;; "foo::foo" or "foo::~foo", i.e. if it's the name of a
6773 ;; (con|de)structor.
6775 (let (name end-2 end-1
)
6776 (goto-char id-start
)
6777 (c-backward-syntactic-ws)
6778 (setq end-2
(point))
6780 (c-simple-skip-symbol-backward)
6783 (buffer-substring-no-properties (point) end-2
))
6784 ;; Cheating in the handling of syntactic ws below.
6785 (< (skip-chars-backward ":~ \t\n\r\v\f") 0))
6787 (setq end-1
(point))
6788 (c-simple-skip-symbol-backward))
6789 (>= (point) type-start
)
6790 (equal (buffer-substring-no-properties (point) end-1
)
6792 ;; It is a (con|de)structor name. In that case the
6793 ;; declaration is typeless so zap out any preceding
6794 ;; identifier(s) that we might have taken as types.
6795 (goto-char type-start
)
6798 id-start type-start
))))))
6800 ;; Check for and step over a type decl expression after the thing
6801 ;; that is or might be a type. This can't be skipped since we
6802 ;; need the correct end position of the declarator for
6803 ;; `max-type-decl-end-*'.
6804 (let ((start (point)) (paren-depth 0) pos
6805 ;; True if there's a non-open-paren match of
6806 ;; `c-type-decl-prefix-key'.
6808 ;; True if the declarator is surrounded by a parenthesis pair.
6810 ;; True if there is an identifier in the declarator.
6812 ;; True if there's a non-close-paren match of
6813 ;; `c-type-decl-suffix-key'.
6815 ;; True if there's a prefix match outside the outermost
6816 ;; paren pair that surrounds the declarator.
6817 got-prefix-before-parens
6818 ;; True if there's a suffix match outside the outermost
6819 ;; paren pair that surrounds the declarator. The value is
6820 ;; the position of the first suffix match.
6821 got-suffix-after-parens
6822 ;; True if we've parsed the type decl to a token that is
6823 ;; known to end declarations in this context.
6825 ;; The earlier values of `at-type' and `type-start' if we've
6826 ;; shifted the type backwards.
6827 identifier-type identifier-start
6828 ;; If `c-parse-and-markup-<>-arglists' is set we need to
6829 ;; turn it off during the name skipping below to avoid
6830 ;; getting `c-type' properties that might be bogus. That
6831 ;; can happen since we don't know if
6832 ;; `c-restricted-<>-arglists' will be correct inside the
6833 ;; arglist paren that gets entered.
6834 c-parse-and-markup-
<>-arglists
)
6836 (goto-char id-start
)
6838 ;; Skip over type decl prefix operators. (Note similar code in
6839 ;; `c-font-lock-declarators'.)
6840 (while (and (looking-at c-type-decl-prefix-key
)
6841 (if (and (c-major-mode-is 'c
++-mode
)
6842 (match-beginning 3))
6843 ;; If the second submatch matches in C++ then
6844 ;; we're looking at an identifier that's a
6845 ;; prefix only if it specifies a member pointer.
6846 (when (setq got-identifier
(c-forward-name))
6847 (if (looking-at "\\(::\\)")
6848 ;; We only check for a trailing "::" and
6849 ;; let the "*" that should follow be
6850 ;; matched in the next round.
6851 (progn (setq got-identifier nil
) t
)
6852 ;; It turned out to be the real identifier,
6857 (if (eq (char-after) ?\
()
6859 (setq paren-depth
(1+ paren-depth
))
6861 (unless got-prefix-before-parens
6862 (setq got-prefix-before-parens
(= paren-depth
0)))
6864 (goto-char (match-end 1)))
6865 (c-forward-syntactic-ws))
6867 (setq got-parens
(> paren-depth
0))
6869 ;; Skip over an identifier.
6871 (and (looking-at c-identifier-start
)
6872 (setq got-identifier
(c-forward-name))))
6874 ;; Skip over type decl suffix operators.
6875 (while (if (looking-at c-type-decl-suffix-key
)
6877 (if (eq (char-after) ?\
))
6878 (when (> paren-depth
0)
6879 (setq paren-depth
(1- paren-depth
))
6882 (when (if (save-match-data (looking-at "\\s\("))
6883 (c-safe (c-forward-sexp 1) t
)
6884 (goto-char (match-end 1))
6886 (when (and (not got-suffix-after-parens
)
6888 (setq got-suffix-after-parens
(match-beginning 0)))
6889 (setq got-suffix t
)))
6891 ;; No suffix matched. We might have matched the
6892 ;; identifier as a type and the open paren of a
6893 ;; function arglist as a type decl prefix. In that
6894 ;; case we should "backtrack": Reinterpret the last
6895 ;; type as the identifier, move out of the arglist and
6896 ;; continue searching for suffix operators.
6898 ;; Do this even if there's no preceding type, to cope
6899 ;; with old style function declarations in K&R C,
6900 ;; (con|de)structors in C++ and `c-typeless-decl-kwds'
6901 ;; style declarations. That isn't applicable in an
6902 ;; arglist context, though.
6903 (when (and (= paren-depth
1)
6904 (not got-prefix-before-parens
)
6905 (not (eq at-type t
))
6908 backup-maybe-typeless
6909 (when c-recognize-typeless-decls
6911 (setq pos
(c-up-list-forward (point)))
6912 (eq (char-before pos
) ?\
)))
6913 (c-fdoc-shift-type-backward)
6917 (c-forward-syntactic-ws))
6919 (when (and (or maybe-typeless backup-maybe-typeless
)
6920 (not got-identifier
)
6923 ;; Have found no identifier but `c-typeless-decl-kwds' has
6924 ;; matched so we know we're inside a declaration. The
6925 ;; preceding type must be the identifier instead.
6926 (c-fdoc-shift-type-backward))
6930 (catch 'at-decl-or-cast
6933 (when (> paren-depth
0)
6934 ;; Encountered something inside parens that isn't matched by
6935 ;; the `c-type-decl-*' regexps, so it's not a type decl
6936 ;; expression. Try to skip out to the same paren depth to
6937 ;; not confuse the cast check below.
6938 (c-safe (goto-char (scan-lists (point) 1 paren-depth
)))
6939 ;; If we've found a specifier keyword then it's a
6940 ;; declaration regardless.
6941 (throw 'at-decl-or-cast
(eq at-decl-or-cast t
)))
6944 (looking-at (cond ((eq context
'<>) "[,>]")
6948 ;; Now we've collected info about various characteristics of
6949 ;; the construct we're looking at. Below follows a decision
6950 ;; tree based on that. It's ordered to check more certain
6951 ;; signs before less certain ones.
6957 (when (and (or at-type maybe-typeless
)
6958 (not (or got-prefix got-parens
)))
6959 ;; Got another identifier directly after the type, so it's a
6961 (throw 'at-decl-or-cast t
))
6963 (when (and got-parens
6965 (not got-suffix-after-parens
)
6968 backup-maybe-typeless
))
6969 ;; Got a declaration of the form "foo bar (gnu);" where we've
6970 ;; recognized "bar" as the type and "gnu" as the declarator.
6971 ;; In this case it's however more likely that "bar" is the
6972 ;; declarator and "gnu" a function argument or initializer (if
6973 ;; `c-recognize-paren-inits' is set), since the parens around
6974 ;; "gnu" would be superfluous if it's a declarator. Shift the
6975 ;; type one step backward.
6976 (c-fdoc-shift-type-backward)))
6978 ;; Found no identifier.
6985 (when (= (point) start
)
6986 ;; Got a plain list of identifiers. If a colon follows it's
6987 ;; a valid label, or maybe a bitfield. Otherwise the last
6988 ;; one probably is the declared identifier and we should
6989 ;; back up to the previous type, providing it isn't a cast.
6990 (if (and (eq (char-after) ?
:)
6991 (not (c-major-mode-is 'java-mode
)))
6993 ;; If we've found a specifier keyword then it's a
6994 ;; declaration regardless.
6995 ((eq at-decl-or-cast t
)
6996 (throw 'at-decl-or-cast t
))
6997 ((and c-has-bitfields
6998 (eq at-decl-or-cast
'ids
)) ; bitfield.
6999 (setq backup-if-not-cast t
)
7000 (throw 'at-decl-or-cast t
)))
7002 (setq backup-if-not-cast t
)
7003 (throw 'at-decl-or-cast t
)))
7006 (when (and got-suffix
7009 ;; Got a plain list of identifiers followed by some suffix.
7010 ;; If this isn't a cast then the last identifier probably is
7011 ;; the declared one and we should back up to the previous
7013 (setq backup-if-not-cast t
)
7014 (throw 'at-decl-or-cast t
)))
7017 (when (eq at-type t
)
7018 ;; If the type is known we know that there can't be any
7019 ;; identifier somewhere else, and it's only in declarations in
7020 ;; e.g. function prototypes and in casts that the identifier may
7022 (throw 'at-decl-or-cast t
))
7024 (when (= (point) start
)
7025 ;; Only got a single identifier (parsed as a type so far).
7028 ;; Check that the identifier isn't at the start of an
7033 ;; Inside an arglist that contains declarations. If K&R
7034 ;; style declarations and parenthesis style initializers
7035 ;; aren't allowed then the single identifier must be a
7036 ;; type, else we require that it's known or found
7037 ;; (primitive types are handled above).
7038 (or (and (not c-recognize-knr-p
)
7039 (not c-recognize-paren-inits
))
7040 (memq at-type
'(known found
))))
7042 ;; Inside a template arglist. Accept known and found
7043 ;; types; other identifiers could just as well be
7044 ;; constants in C++.
7045 (memq at-type
'(known found
)))))
7046 (throw 'at-decl-or-cast t
)
7048 ;; Can't be a valid declaration or cast, but if we've found a
7049 ;; specifier it can't be anything else either, so treat it as
7050 ;; an invalid/unfinished declaration or cast.
7051 (throw 'at-decl-or-cast at-decl-or-cast
))))
7056 (not (eq at-type t
))
7059 backup-maybe-typeless
7060 (when c-recognize-typeless-decls
7061 (or (not got-suffix
)
7063 c-after-suffixed-type-maybe-decl-key
))))))
7064 ;; Got an empty paren pair and a preceding type that probably
7065 ;; really is the identifier. Shift the type backwards to make
7066 ;; the last one the identifier. This is analogous to the
7067 ;; "backtracking" done inside the `c-type-decl-suffix-key' loop
7070 ;; Exception: In addition to the conditions in that
7071 ;; "backtracking" code, do not shift backward if we're not
7072 ;; looking at either `c-after-suffixed-type-decl-key' or "[;,]".
7073 ;; Since there's no preceding type, the shift would mean that
7074 ;; the declaration is typeless. But if the regexp doesn't match
7075 ;; then we will simply fall through in the tests below and not
7076 ;; recognize it at all, so it's better to try it as an abstract
7077 ;; declarator instead.
7078 (c-fdoc-shift-type-backward)
7080 ;; Still no identifier.
7082 (when (and got-prefix
(or got-parens got-suffix
))
7083 ;; Require `got-prefix' together with either `got-parens' or
7084 ;; `got-suffix' to recognize it as an abstract declarator:
7085 ;; `got-parens' only is probably an empty function call.
7086 ;; `got-suffix' only can build an ordinary expression together
7087 ;; with the preceding identifier which we've taken as a type.
7088 ;; We could actually accept on `got-prefix' only, but that can
7089 ;; easily occur temporarily while writing an expression so we
7090 ;; avoid that case anyway. We could do a better job if we knew
7091 ;; the point when the fontification was invoked.
7092 (throw 'at-decl-or-cast t
))
7098 got-suffix-after-parens
7099 (eq (char-after got-suffix-after-parens
) ?\
())
7100 ;; Got a type, no declarator but a paren suffix. I.e. it's a
7101 ;; normal function call after all (or perhaps a C++ style object
7102 ;; instantiation expression).
7103 (throw 'at-decl-or-cast nil
))))
7106 (when at-decl-or-cast
7107 ;; By now we've located the type in the declaration that we know
7109 (throw 'at-decl-or-cast t
))
7112 (when (and got-identifier
7114 (looking-at c-after-suffixed-type-decl-key
)
7118 (not (eq at-type t
)))
7119 ;; Shift the type backward in the case that there's a
7120 ;; single identifier inside parens. That can only
7121 ;; occur in K&R style function declarations so it's
7122 ;; more likely that it really is a function call.
7123 ;; Therefore we only do this after
7124 ;; `c-after-suffixed-type-decl-key' has matched.
7125 (progn (c-fdoc-shift-type-backward) t
)
7126 got-suffix-after-parens
))
7127 ;; A declaration according to `c-after-suffixed-type-decl-key'.
7128 (throw 'at-decl-or-cast t
))
7131 (when (and (or got-prefix
(not got-parens
))
7132 (memq at-type
'(t known
)))
7133 ;; It's a declaration if a known type precedes it and it can't be a
7135 (throw 'at-decl-or-cast t
))
7137 ;; If we get here we can't tell if this is a type decl or a normal
7138 ;; expression by looking at it alone. (That's under the assumption
7139 ;; that normal expressions always can look like type decl expressions,
7140 ;; which isn't really true but the cases where it doesn't hold are so
7141 ;; uncommon (e.g. some placements of "const" in C++) it's not worth
7142 ;; the effort to look for them.)
7144 (unless (or at-decl-end
(looking-at "=[^=]"))
7145 ;; If this is a declaration it should end here or its initializer(*)
7146 ;; should start here, so check for allowed separation tokens. Note
7147 ;; that this rule doesn't work e.g. with a K&R arglist after a
7150 ;; *) Don't check for C++ style initializers using parens
7151 ;; since those already have been matched as suffixes.
7153 ;; If `at-decl-or-cast' is then we've found some other sign that
7154 ;; it's a declaration or cast, so then it's probably an
7155 ;; invalid/unfinished one.
7156 (throw 'at-decl-or-cast at-decl-or-cast
))
7158 ;; Below are tests that only should be applied when we're certain to
7159 ;; not have parsed halfway through an expression.
7162 (when (memq at-type
'(t known
))
7163 ;; The expression starts with a known type so treat it as a
7165 (throw 'at-decl-or-cast t
))
7168 (when (and (c-major-mode-is 'c
++-mode
)
7169 ;; In C++ we check if the identifier is a known type, since
7170 ;; (con|de)structors use the class name as identifier.
7171 ;; We've always shifted over the identifier as a type and
7172 ;; then backed up again in this case.
7174 (or (memq identifier-type
'(found known
))
7175 (and (eq (char-after identifier-start
) ?~
)
7176 ;; `at-type' probably won't be 'found for
7177 ;; destructors since the "~" is then part of the
7178 ;; type name being checked against the list of
7179 ;; known types, so do a check without that
7182 (goto-char (1+ identifier-start
))
7183 (c-forward-syntactic-ws)
7184 (c-with-syntax-table
7185 c-identifier-syntax-table
7186 (looking-at c-known-type-key
)))
7188 (goto-char (1+ identifier-start
))
7189 ;; We have already parsed the type earlier,
7190 ;; so it'd be possible to cache the end
7191 ;; position instead of redoing it here, but
7192 ;; then we'd need to keep track of another
7193 ;; position everywhere.
7194 (c-check-type (point)
7195 (progn (c-forward-type)
7197 (throw 'at-decl-or-cast t
))
7202 (when (and got-prefix-before-parens
7204 (or at-decl-end
(looking-at "=[^=]"))
7207 ;; Got something like "foo * bar;". Since we're not inside an
7208 ;; arglist it would be a meaningless expression because the
7209 ;; result isn't used. We therefore choose to recognize it as
7210 ;; a declaration. Do not allow a suffix since it could then
7211 ;; be a function call.
7212 (throw 'at-decl-or-cast t
))
7215 (when (and (or got-suffix-after-parens
7216 (looking-at "=[^=]"))
7218 (not (eq context
'arglist
)))
7219 ;; Got something like "a (*b) (c);" or "a (b) = c;". It could
7220 ;; be an odd expression or it could be a declaration. Treat
7221 ;; it as a declaration if "a" has been used as a type
7222 ;; somewhere else (if it's a known type we won't get here).
7223 (throw 'at-decl-or-cast t
)))
7228 (and (eq context
'decl
)
7229 (not c-recognize-paren-inits
)
7230 (or got-parens got-suffix
))))
7231 ;; Got a type followed by an abstract declarator. If `got-prefix'
7232 ;; is set it's something like "a *" without anything after it. If
7233 ;; `got-parens' or `got-suffix' is set it's "a()", "a[]", "a()[]",
7234 ;; or similar, which we accept only if the context rules out
7236 (throw 'at-decl-or-cast t
)))
7238 ;; If we had a complete symbol table here (which rules out
7239 ;; `c-found-types') we should return t due to the disambiguation rule
7240 ;; (in at least C++) that anything that can be parsed as a declaration
7241 ;; is a declaration. Now we're being more defensive and prefer to
7242 ;; highlight things like "foo (bar);" as a declaration only if we're
7243 ;; inside an arglist that contains declarations.
7244 (eq context
'decl
))))
7246 ;; The point is now after the type decl expression.
7249 ;; Check for a cast.
7254 ;; Should be the first type/identifier in a cast paren.
7255 (> preceding-token-end
(point-min))
7256 (memq (char-before preceding-token-end
) c-cast-parens
)
7258 ;; The closing paren should follow.
7260 (c-forward-syntactic-ws)
7261 (looking-at "\\s\)"))
7263 ;; There should be a primary expression after it.
7266 (c-forward-syntactic-ws)
7267 (setq cast-end
(point))
7268 (and (looking-at c-primary-expr-regexp
)
7270 (setq pos
(match-end 0))
7272 ;; Check if the expression begins with a prefix keyword.
7274 (if (match-beginning 1)
7275 ;; Expression begins with an ambiguous operator. Treat
7276 ;; it as a cast if it's a type decl or if we've
7277 ;; recognized the type somewhere else.
7279 (memq at-type
'(t known found
)))
7280 ;; Unless it's a keyword, it's the beginning of a primary
7282 (not (looking-at c-keywords-regexp
)))))
7283 ;; If `c-primary-expr-regexp' matched a nonsymbol token, check
7284 ;; that it matched a whole one so that we don't e.g. confuse
7285 ;; the operator '-' with '->'. It's ok if it matches further,
7286 ;; though, since it e.g. can match the float '.5' while the
7287 ;; operator regexp only matches '.'.
7288 (or (not (looking-at c-nonsymbol-token-regexp
))
7289 (<= (match-end 0) pos
))))
7291 ;; There should either be a cast before it or something that isn't an
7292 ;; identifier or close paren.
7293 (> preceding-token-end
(point-min))
7295 (goto-char (1- preceding-token-end
))
7296 (or (eq (point) last-cast-end
)
7298 (c-backward-syntactic-ws)
7299 (if (< (skip-syntax-backward "w_") 0)
7300 ;; It's a symbol. Accept it only if it's one of the
7301 ;; keywords that can precede an expression (without
7302 ;; surrounding parens).
7303 (looking-at c-simple-stmt-key
)
7305 ;; Check that it isn't a close paren (block close is ok,
7307 (not (memq (char-before) '(?\
) ?\
])))
7308 ;; Check that it isn't a nonsymbol identifier.
7309 (not (c-on-identifier)))))))))
7312 (when (and c-record-type-identifiers at-type
(not (eq at-type t
)))
7313 (let ((c-promote-possible-types t
))
7314 (goto-char type-start
)
7317 (goto-char cast-end
)
7321 ;; We're at a declaration. Highlight the type and the following
7324 (when backup-if-not-cast
7325 (c-fdoc-shift-type-backward t
))
7327 (when (and (eq context
'decl
) (looking-at ","))
7328 ;; Make sure to propagate the `c-decl-arg-start' property to
7329 ;; the next argument if it's set in this one, to cope with
7330 ;; interactive refontification.
7331 (c-put-c-type-property (point) 'c-decl-arg-start
))
7333 (when (and c-record-type-identifiers at-type
(not (eq at-type t
)))
7334 (let ((c-promote-possible-types t
))
7336 (goto-char type-start
)
7340 (and (or at-type-decl at-typedef
)
7341 (cons at-type-decl at-typedef
))))
7344 ;; False alarm. Restore the recorded ranges.
7345 (setq c-record-type-identifiers save-rec-type-ids
7346 c-record-ref-identifiers save-rec-ref-ids
)
7349 (defun c-forward-label (&optional assume-markup preceding-token-end limit
)
7350 ;; Assuming that point is at the beginning of a token, check if it starts a
7351 ;; label and if so move over it and return non-nil (t in default situations,
7352 ;; specific symbols (see below) for interesting situations), otherwise don't
7353 ;; move and return nil. "Label" here means "most things with a colon".
7355 ;; More precisely, a "label" is regarded as one of:
7356 ;; (i) a goto target like "foo:" - returns the symbol `goto-target';
7357 ;; (ii) A case label - either the entire construct "case FOO:", or just the
7358 ;; bare "case", should the colon be missing. We return t;
7359 ;; (iii) a keyword which needs a colon, like "default:" or "private:"; We
7361 ;; (iv) One of QT's "extended" C++ variants of
7362 ;; "private:"/"protected:"/"public:"/"more:" looking like "public slots:".
7363 ;; Returns the symbol `qt-2kwds-colon'.
7364 ;; (v) QT's construct "signals:". Returns the symbol `qt-1kwd-colon'.
7365 ;; (vi) One of the keywords matched by `c-opt-extra-label-key' (without any
7366 ;; colon). Currently (2006-03), this applies only to Objective C's
7367 ;; keywords "@private", "@protected", and "@public". Returns t.
7369 ;; One of the things which will NOT be recognized as a label is a bit-field
7370 ;; element of a struct, something like "int foo:5".
7372 ;; The end of the label is taken to be just after the colon, or the end of
7373 ;; the first submatch in `c-opt-extra-label-key'. The point is directly
7374 ;; after the end on return. The terminating char gets marked with
7375 ;; `c-decl-end' to improve recognition of the following declaration or
7378 ;; If ASSUME-MARKUP is non-nil, it's assumed that the preceding
7379 ;; label, if any, has already been marked up like that.
7381 ;; If PRECEDING-TOKEN-END is given, it should be the first position
7382 ;; after the preceding token, i.e. on the other side of the
7383 ;; syntactic ws from the point. Use a value less than or equal to
7384 ;; (point-min) if the point is at the first token in (the visible
7385 ;; part of) the buffer.
7387 ;; The optional LIMIT limits the forward scan for the colon.
7389 ;; This function records the ranges of the label symbols on
7390 ;; `c-record-ref-identifiers' if `c-record-type-identifiers' (!) is
7393 ;; This function might do hidden buffer changes.
7395 (let ((start (point))
7398 macro-start
; if we're in one.
7402 ;; "case" or "default" (Doesn't apply to AWK).
7403 ((looking-at c-label-kwds-regexp
)
7404 (let ((kwd-end (match-end 1)))
7405 ;; Record only the keyword itself for fontification, since in
7406 ;; case labels the following is a constant expression and not
7408 (when c-record-type-identifiers
7409 (c-record-ref-id (cons (match-beginning 1) kwd-end
)))
7411 ;; Find the label end.
7414 (if (and (c-syntactic-re-search-forward
7415 ;; Stop on chars that aren't allowed in expressions,
7416 ;; and on operator chars that would be meaningless
7417 ;; there. FIXME: This doesn't cope with ?: operators.
7418 "[;{=,@]\\|\\(\\=\\|[^:]\\):\\([^:]\\|\\'\\)"
7420 (match-beginning 2))
7422 (progn ; there's a proper :
7423 (goto-char (match-beginning 2)) ; just after the :
7424 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7427 ;; It's an unfinished label. We consider the keyword enough
7428 ;; to recognize it as a label, so that it gets fontified.
7429 ;; Leave the point at the end of it, but don't put any
7430 ;; `c-decl-end' marker.
7434 ;; @private, @protected, @public, in Objective C, or similar.
7435 ((and c-opt-extra-label-key
7436 (looking-at c-opt-extra-label-key
))
7437 ;; For a `c-opt-extra-label-key' match, we record the whole
7438 ;; thing for fontification. That's to get the leading '@' in
7439 ;; Objective-C protection labels fontified.
7440 (goto-char (match-end 1))
7441 (when c-record-type-identifiers
7442 (c-record-ref-id (cons (match-beginning 1) (point))))
7443 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7444 (setq label-type t
))
7446 ;; All other cases of labels.
7447 ((and c-recognize-colon-labels
; nil for AWK and IDL, otherwise t.
7449 ;; A colon label must have something before the colon.
7450 (not (eq (char-after) ?
:))
7452 ;; Check that we're not after a token that can't precede a label.
7454 ;; Trivially succeeds when there's no preceding token.
7455 ;; Succeeds when we're at a virtual semicolon.
7456 (if preceding-token-end
7457 (<= preceding-token-end
(point-min))
7459 (c-backward-syntactic-ws)
7460 (setq preceding-token-end
(point))
7464 ;; Check if we're after a label, if we're after a closing
7465 ;; paren that belong to statement, and with
7466 ;; `c-label-prefix-re'. It's done in different order
7467 ;; depending on `assume-markup' since the checks have
7468 ;; different expensiveness.
7471 (eq (c-get-char-property (1- preceding-token-end
) 'c-type
)
7475 (goto-char (1- preceding-token-end
))
7476 (c-beginning-of-current-token)
7477 (or (looking-at c-label-prefix-re
)
7478 (looking-at c-block-stmt-1-key
)))
7480 (and (eq (char-before preceding-token-end
) ?\
))
7481 (c-after-conditional)))
7485 (goto-char (1- preceding-token-end
))
7486 (c-beginning-of-current-token)
7487 (or (looking-at c-label-prefix-re
)
7488 (looking-at c-block-stmt-1-key
)))
7491 ((eq (char-before preceding-token-end
) ?\
))
7492 (c-after-conditional))
7494 ((eq (char-before preceding-token-end
) ?
:)
7495 ;; Might be after another label, so check it recursively.
7498 (goto-char (1- preceding-token-end
))
7499 ;; Essentially the same as the
7500 ;; `c-syntactic-re-search-forward' regexp below.
7502 (save-excursion (and (c-beginning-of-macro)
7504 (if macro-start
(narrow-to-region macro-start
(point-max)))
7505 (c-syntactic-skip-backward "^-]:?;}=*/%&|,<>!@+" nil t
)
7506 ;; Note: the following should work instead of the
7507 ;; narrow-to-region above. Investigate why not,
7508 ;; sometime. ACM, 2006-03-31.
7509 ;; (c-syntactic-skip-backward "^-]:?;}=*/%&|,<>!@+"
7512 ;; If the caller turned on recording for us,
7513 ;; it shouldn't apply when we check the
7515 c-record-type-identifiers
)
7516 ;; A label can't start at a cpp directive. Check for
7517 ;; this, since c-forward-syntactic-ws would foul up on it.
7518 (unless (and c-opt-cpp-prefix
(looking-at c-opt-cpp-prefix
))
7519 (c-forward-syntactic-ws)
7520 (c-forward-label nil pte start
))))))))))
7522 ;; Point is still at the beginning of the possible label construct.
7524 ;; Check that the next nonsymbol token is ":", or that we're in one
7525 ;; of QT's "slots" declarations. Allow '(' for the sake of macro
7526 ;; arguments. FIXME: Should build this regexp from the language
7529 ;; public: protected: private:
7531 (c-major-mode-is 'c
++-mode
)
7532 (search-forward-regexp
7533 "\\=p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\>[^_]" nil t
)
7534 (progn (backward-char)
7535 (c-forward-syntactic-ws limit
)
7536 (looking-at ":\\([^:]\\|\\'\\)"))) ; A single colon.
7538 (setq label-type t
))
7539 ;; QT double keyword like "protected slots:" or goto target.
7540 ((progn (goto-char start
) nil
))
7541 ((when (c-syntactic-re-search-forward
7542 "[ \t\n[:?;{=*/%&|,<>!@+-]" limit t t
) ; not at EOB
7544 (setq label-end
(point))
7546 (and (c-major-mode-is 'c
++-mode
)
7548 "\\(p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\|more\\)\\>"
7549 (buffer-substring start
(point)))))
7550 (c-forward-syntactic-ws limit
)
7552 ((looking-at ":\\([^:]\\|\\'\\)") ; A single colon.
7555 (if (or (string= "signals" ; Special QT macro
7556 (setq kwd
(buffer-substring-no-properties start label-end
)))
7557 (string= "Q_SIGNALS" kwd
))
7561 (search-forward-regexp "\\=\\(slots\\|Q_SLOTS\\)\\>" limit t
)
7562 (progn (c-forward-syntactic-ws limit
)
7563 (looking-at ":\\([^:]\\|\\'\\)"))) ; A single colon
7565 (setq label-type
'qt-2kwds-colon
)))))))
7568 (narrow-to-region start
(point))
7570 ;; Check that `c-nonlabel-token-key' doesn't match anywhere.
7574 (when (looking-at c-nonlabel-token-key
)
7576 (setq label-type nil
)
7577 (throw 'check-label nil
))
7578 (and (c-safe (c-forward-sexp)
7579 (c-forward-syntactic-ws)
7583 ;; Record the identifiers in the label for fontification, unless
7584 ;; it begins with `c-label-kwds' in which case the following
7585 ;; identifiers are part of a (constant) expression that
7586 ;; shouldn't be fontified.
7587 (when (and c-record-type-identifiers
7588 (progn (goto-char start
)
7589 (not (looking-at c-label-kwds-regexp
))))
7590 (while (c-syntactic-re-search-forward c-symbol-key nil t
)
7591 (c-record-ref-id (cons (match-beginning 0)
7594 (c-put-c-type-property (1- (point-max)) 'c-decl-end
)
7595 (goto-char (point-max)))))
7602 (defun c-forward-objc-directive ()
7603 ;; Assuming the point is at the beginning of a token, try to move
7604 ;; forward to the end of the Objective-C directive that starts
7605 ;; there. Return t if a directive was fully recognized, otherwise
7606 ;; the point is moved as far as one could be successfully parsed and
7609 ;; This function records identifier ranges on
7610 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
7611 ;; `c-record-type-identifiers' is non-nil.
7613 ;; This function might do hidden buffer changes.
7615 (let ((start (point))
7617 (c-promote-possible-types t
)
7619 ;; Turn off recognition of angle bracket arglists while parsing
7620 ;; types here since the protocol reference list might then be
7621 ;; considered part of the preceding name or superclass-name.
7622 c-recognize-
<>-arglists
)
7627 (c-make-keywords-re t
7628 (append (c-lang-const c-protection-kwds objc
)
7631 (goto-char (match-end 1))
7637 (c-make-keywords-re t
7638 '("@interface" "@implementation" "@protocol")
7641 ;; Handle the name of the class itself.
7643 ; (c-forward-token-2) ; 2006/1/13 This doesn't move if the token's
7645 (goto-char (match-end 0))
7651 ;; Look for ": superclass-name" or "( category-name )".
7652 (when (looking-at "[:\(]")
7653 (setq start-char
(char-after))
7655 (c-forward-syntactic-ws)
7656 (unless (c-forward-type) (throw 'break nil
))
7657 (when (eq start-char ?\
()
7658 (unless (eq (char-after) ?\
)) (throw 'break nil
))
7660 (c-forward-syntactic-ws)))
7662 ;; Look for a protocol reference list.
7663 (if (eq (char-after) ?
<)
7664 (let ((c-recognize-<>-arglists t
)
7665 (c-parse-and-markup-<>-arglists t
)
7666 c-restricted-
<>-arglists
)
7667 (c-forward-<>-arglist t
))
7671 (c-backward-syntactic-ws lim
)
7672 (c-clear-c-type-property start
(1- (point)) 'c-decl-end
)
7673 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7676 (c-clear-c-type-property start
(point) 'c-decl-end
)
7679 (defun c-beginning-of-inheritance-list (&optional lim
)
7680 ;; Go to the first non-whitespace after the colon that starts a
7681 ;; multiple inheritance introduction. Optional LIM is the farthest
7682 ;; back we should search.
7684 ;; This function might do hidden buffer changes.
7685 (c-with-syntax-table c
++-template-syntax-table
7686 (c-backward-token-2 0 t lim
)
7687 (while (and (or (looking-at c-symbol-start
)
7688 (looking-at "[<,]\\|::"))
7689 (zerop (c-backward-token-2 1 t lim
))))))
7691 (defun c-in-method-def-p ()
7692 ;; Return nil if we aren't in a method definition, otherwise the
7693 ;; position of the initial [+-].
7695 ;; This function might do hidden buffer changes.
7698 (and c-opt-method-key
7699 (looking-at c-opt-method-key
)
7703 ;; Contributed by Kevin Ryde <user42@zip.com.au>.
7704 (defun c-in-gcc-asm-p ()
7705 ;; Return non-nil if point is within a gcc \"asm\" block.
7707 ;; This should be called with point inside an argument list.
7709 ;; Only one level of enclosing parentheses is considered, so for
7710 ;; instance `nil' is returned when in a function call within an asm
7713 ;; This function might do hidden buffer changes.
7715 (and c-opt-asm-stmt-key
7718 (backward-up-list 1)
7719 (c-beginning-of-statement-1 (point-min) nil t
)
7720 (looking-at c-opt-asm-stmt-key
))))
7722 (defun c-at-toplevel-p ()
7723 "Return a determination as to whether point is \"at the top level\".
7724 Informally, \"at the top level\" is anywhere where you can write
7727 More precisely, being at the top-level means that point is either
7728 outside any enclosing block (such as a function definition), or
7729 directly inside a class, namespace or other block that contains
7730 another declaration level.
7732 If point is not at the top-level (e.g. it is inside a method
7733 definition), then nil is returned. Otherwise, if point is at a
7734 top-level not enclosed within a class definition, t is returned.
7735 Otherwise, a 2-vector is returned where the zeroth element is the
7736 buffer position of the start of the class declaration, and the first
7737 element is the buffer position of the enclosing class's opening
7740 Note that this function might do hidden buffer changes. See the
7741 comment at the start of cc-engine.el for more info."
7742 (let ((paren-state (c-parse-state)))
7743 (or (not (c-most-enclosing-brace paren-state
))
7744 (c-search-uplist-for-classkey paren-state
))))
7746 (defun c-just-after-func-arglist-p (&optional lim
)
7747 ;; Return non-nil if the point is in the region after the argument
7748 ;; list of a function and its opening brace (or semicolon in case it
7749 ;; got no body). If there are K&R style argument declarations in
7750 ;; that region, the point has to be inside the first one for this
7751 ;; function to recognize it.
7753 ;; If successful, the point is moved to the first token after the
7754 ;; function header (see `c-forward-decl-or-cast-1' for details) and
7755 ;; the position of the opening paren of the function arglist is
7758 ;; The point is clobbered if not successful.
7760 ;; LIM is used as bound for backward buffer searches.
7762 ;; This function might do hidden buffer changes.
7764 (let ((beg (point)) end id-start
)
7766 (eq (c-beginning-of-statement-1 lim
) 'same
)
7768 (not (and (c-major-mode-is 'objc-mode
)
7769 (c-forward-objc-directive)))
7772 (car-safe (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
)))
7775 ;; There should not be a '=' or ',' between beg and the
7776 ;; start of the declaration since that means we were in the
7777 ;; "expression part" of the declaration.
7779 (not (looking-at "[=,]")))
7782 ;; Check that there's an arglist paren in the
7784 (goto-char id-start
)
7785 (cond ((eq (char-after) ?\
()
7786 ;; The declarator is a paren expression, so skip past it
7787 ;; so that we don't get stuck on that instead of the
7788 ;; function arglist.
7790 ((and c-opt-op-identifier-prefix
7791 (looking-at c-opt-op-identifier-prefix
))
7792 ;; Don't trip up on "operator ()".
7793 (c-forward-token-2 2 t
)))
7794 (and (< (point) beg
)
7795 (c-syntactic-re-search-forward "(" beg t t
)
7798 (defun c-in-knr-argdecl (&optional lim
)
7799 ;; Return the position of the first argument declaration if point is
7800 ;; inside a K&R style argument declaration list, nil otherwise.
7801 ;; `c-recognize-knr-p' is not checked. If LIM is non-nil, it's a
7802 ;; position that bounds the backward search for the argument list.
7804 ;; Point must be within a possible K&R region, e.g. just before a top-level
7805 ;; "{". It must be outside of parens and brackets. The test can return
7806 ;; false positives otherwise.
7808 ;; This function might do hidden buffer changes.
7812 ;; If we're in a macro, our search range is restricted to it. Narrow to
7813 ;; the searchable range.
7814 (let* ((macro-start (save-excursion (and (c-beginning-of-macro) (point))))
7815 (macro-end (save-excursion (and macro-start
(c-end-of-macro) (point))))
7816 (low-lim (max (or lim
(point-min)) (or macro-start
(point-min))))
7817 before-lparen after-rparen
7818 (pp-count-out 20)) ; Max number of paren/brace constructs before
7820 (narrow-to-region low-lim
(or macro-end
(point-max)))
7822 ;; Search backwards for the defun's argument list. We give up if we
7823 ;; encounter a "}" (end of a previous defun) an "=" (which can't be in
7824 ;; a knr region) or BOB.
7826 ;; The criterion for a paren structure being the arg list is:
7827 ;; o - there is non-WS stuff after it but before any "{"; AND
7828 ;; o - the token after it isn't a ";" AND
7829 ;; o - it is preceded by either an identifier (the function name) or
7830 ;; a macro expansion like "DEFUN (...)"; AND
7831 ;; o - its content is a non-empty comma-separated list of identifiers
7832 ;; (an empty arg list won't have a knr region).
7834 ;; The following snippet illustrates these rules:
7835 ;; int foo (bar, baz, yuk)
7837 ;; int (*baz) (my_type) ;
7838 ;; int (*) (void) (*yuk) (void) ;
7842 (while (> pp-count-out
0) ; go back one paren/bracket pair each time.
7843 (setq pp-count-out
(1- pp-count-out
))
7844 (c-syntactic-skip-backward "^)]}=")
7845 (cond ((eq (char-before) ?\
))
7846 (setq after-rparen
(point)))
7847 ((eq (char-before) ?\
])
7848 (setq after-rparen nil
))
7849 (t ; either } (hit previous defun) or = or no more
7854 ;; We're inside a paren. Could it be our argument list....?
7858 (goto-char after-rparen
)
7859 (unless (c-go-list-backward) (throw 'knr nil
)) ;
7860 ;; FIXME!!! What about macros between the parens? 2007/01/20
7861 (setq before-lparen
(point)))
7863 ;; It can't be the arg list if next token is ; or {
7864 (progn (goto-char after-rparen
)
7865 (c-forward-syntactic-ws)
7866 (not (memq (char-after) '(?\
; ?\{ ?\=))))
7868 ;; Is the thing preceding the list an identifier (the
7869 ;; function name), or a macro expansion?
7871 (goto-char before-lparen
)
7872 (eq (c-backward-token-2) 0)
7873 (or (eq (c-on-identifier) (point))
7874 (and (eq (char-after) ?\
))
7875 (c-go-up-list-backward)
7876 (eq (c-backward-token-2) 0)
7877 (eq (c-on-identifier) (point)))))
7879 ;; Have we got a non-empty list of comma-separated
7882 (goto-char before-lparen
)
7883 (c-forward-token-2) ; to first token inside parens
7888 (while (eq (char-after) ?\
,)
7890 (unless (c-on-identifier) (throw 'id-list nil
))
7891 (c-forward-token-2))
7892 (eq (char-after) ?\
))))))
7894 ;; ...Yes. We've identified the function's argument list.
7896 (progn (goto-char after-rparen
)
7897 (c-forward-syntactic-ws)
7900 ;; ...No. The current parens aren't the function's arg list.
7901 (goto-char before-lparen
))
7903 (or (c-go-list-backward) ; backwards over [ .... ]
7904 (throw 'knr nil
)))))))))
7906 (defun c-skip-conditional ()
7907 ;; skip forward over conditional at point, including any predicate
7908 ;; statements in parentheses. No error checking is performed.
7910 ;; This function might do hidden buffer changes.
7911 (c-forward-sexp (cond
7913 ((looking-at (concat "\\<else"
7914 "\\([ \t\n]\\|\\\\\n\\)+"
7915 "if\\>\\([^_]\\|$\\)"))
7917 ;; do, else, try, finally
7918 ((looking-at (concat "\\<\\("
7919 "do\\|else\\|try\\|finally"
7920 "\\)\\>\\([^_]\\|$\\)"))
7922 ;; for, if, while, switch, catch, synchronized, foreach
7925 (defun c-after-conditional (&optional lim
)
7926 ;; If looking at the token after a conditional then return the
7927 ;; position of its start, otherwise return nil.
7929 ;; This function might do hidden buffer changes.
7931 (and (zerop (c-backward-token-2 1 t lim
))
7932 (or (looking-at c-block-stmt-1-key
)
7933 (and (eq (char-after) ?\
()
7934 (zerop (c-backward-token-2 1 t lim
))
7935 (looking-at c-block-stmt-2-key
)))
7938 (defun c-after-special-operator-id (&optional lim
)
7939 ;; If the point is after an operator identifier that isn't handled
7940 ;; like an ordinary symbol (i.e. like "operator =" in C++) then the
7941 ;; position of the start of that identifier is returned. nil is
7942 ;; returned otherwise. The point may be anywhere in the syntactic
7943 ;; whitespace after the last token of the operator identifier.
7945 ;; This function might do hidden buffer changes.
7947 (and c-overloadable-operators-regexp
7948 (zerop (c-backward-token-2 1 nil lim
))
7949 (looking-at c-overloadable-operators-regexp
)
7950 (or (not c-opt-op-identifier-prefix
)
7952 (zerop (c-backward-token-2 1 nil lim
))
7953 (looking-at c-opt-op-identifier-prefix
)))
7956 (defsubst c-backward-to-block-anchor
(&optional lim
)
7957 ;; Assuming point is at a brace that opens a statement block of some
7958 ;; kind, move to the proper anchor point for that block. It might
7959 ;; need to be adjusted further by c-add-stmt-syntax, but the
7960 ;; position at return is suitable as start position for that
7963 ;; This function might do hidden buffer changes.
7964 (unless (= (point) (c-point 'boi
))
7965 (let ((start (c-after-conditional lim
)))
7967 (goto-char start
)))))
7969 (defsubst c-backward-to-decl-anchor
(&optional lim
)
7970 ;; Assuming point is at a brace that opens the block of a top level
7971 ;; declaration of some kind, move to the proper anchor point for
7974 ;; This function might do hidden buffer changes.
7975 (unless (= (point) (c-point 'boi
))
7976 (c-beginning-of-statement-1 lim
)))
7978 (defun c-search-decl-header-end ()
7979 ;; Search forward for the end of the "header" of the current
7980 ;; declaration. That's the position where the definition body
7981 ;; starts, or the first variable initializer, or the ending
7982 ;; semicolon. I.e. search forward for the closest following
7983 ;; (syntactically relevant) '{', '=' or ';' token. Point is left
7984 ;; _after_ the first found token, or at point-max if none is found.
7986 ;; This function might do hidden buffer changes.
7988 (let ((base (point)))
7989 (if (c-major-mode-is 'c
++-mode
)
7991 ;; In C++ we need to take special care to handle operator
7992 ;; tokens and those pesky template brackets.
7994 (c-syntactic-re-search-forward "[;{<=]" nil
'move t t
)
7996 (c-end-of-current-token base
)
7997 ;; Handle operator identifiers, i.e. ignore any
7998 ;; operator token preceded by "operator".
8000 (and (c-safe (c-backward-sexp) t
)
8001 (looking-at c-opt-op-identifier-prefix
)))
8002 (and (eq (char-before) ?
<)
8003 (c-with-syntax-table c
++-template-syntax-table
8004 (if (c-safe (goto-char (c-up-list-forward (point))))
8006 (goto-char (point-max))
8008 (setq base
(point)))
8011 (c-syntactic-re-search-forward "[;{=]" nil
'move t t
)
8012 (c-end-of-current-token base
))
8013 (setq base
(point))))))
8015 (defun c-beginning-of-decl-1 (&optional lim
)
8016 ;; Go to the beginning of the current declaration, or the beginning
8017 ;; of the previous one if already at the start of it. Point won't
8018 ;; be moved out of any surrounding paren. Return a cons cell of the
8019 ;; form (MOVE . KNR-POS). MOVE is like the return value from
8020 ;; `c-beginning-of-statement-1'. If point skipped over some K&R
8021 ;; style argument declarations (and they are to be recognized) then
8022 ;; KNR-POS is set to the start of the first such argument
8023 ;; declaration, otherwise KNR-POS is nil. If LIM is non-nil, it's a
8024 ;; position that bounds the backward search.
8026 ;; NB: Cases where the declaration continues after the block, as in
8027 ;; "struct foo { ... } bar;", are currently recognized as two
8028 ;; declarations, e.g. "struct foo { ... }" and "bar;" in this case.
8030 ;; This function might do hidden buffer changes.
8032 (let* ((start (point))
8033 (last-stmt-start (point))
8034 (move (c-beginning-of-statement-1 lim nil t
)))
8036 ;; `c-beginning-of-statement-1' stops at a block start, but we
8037 ;; want to continue if the block doesn't begin a top level
8038 ;; construct, i.e. if it isn't preceded by ';', '}', ':', bob,
8039 ;; or an open paren.
8040 (let ((beg (point)) tentative-move
)
8041 ;; Go back one "statement" each time round the loop until we're just
8042 ;; after a ;, }, or :, or at BOB or the start of a macro or start of
8043 ;; an ObjC method. This will move over a multiple declaration whose
8044 ;; components are comma separated.
8046 ;; Must check with c-opt-method-key in ObjC mode.
8047 (not (and c-opt-method-key
8048 (looking-at c-opt-method-key
)))
8049 (/= last-stmt-start
(point))
8051 (c-backward-syntactic-ws lim
)
8052 (not (memq (char-before) '(?\
; ?} ?: nil))))
8055 (not (looking-at "\\s(")))
8056 ;; Check that we don't move from the first thing in a
8057 ;; macro to its header.
8058 (not (eq (setq tentative-move
8059 (c-beginning-of-statement-1 lim nil t
))
8061 (setq last-stmt-start beg
8063 move tentative-move
))
8066 (when c-recognize-knr-p
8067 (let ((fallback-pos (point)) knr-argdecl-start
)
8068 ;; Handle K&R argdecls. Back up after the "statement" jumped
8069 ;; over by `c-beginning-of-statement-1', unless it was the
8070 ;; function body, in which case we're sitting on the opening
8071 ;; brace now. Then test if we're in a K&R argdecl region and
8072 ;; that we started at the other side of the first argdecl in
8074 (unless (eq (char-after) ?
{)
8075 (goto-char last-stmt-start
))
8076 (if (and (setq knr-argdecl-start
(c-in-knr-argdecl lim
))
8077 (< knr-argdecl-start start
)
8079 (goto-char knr-argdecl-start
)
8080 (not (eq (c-beginning-of-statement-1 lim nil t
) 'macro
))))
8082 (cons (if (eq (char-after fallback-pos
) ?
{)
8086 (goto-char fallback-pos
))))
8088 ;; `c-beginning-of-statement-1' counts each brace block as a separate
8089 ;; statement, so the result will be 'previous if we've moved over any.
8090 ;; So change our result back to 'same if necessary.
8092 ;; If they were brace list initializers we might not have moved over a
8093 ;; declaration boundary though, so change it to 'same if we've moved
8094 ;; past a '=' before '{', but not ';'. (This ought to be integrated
8095 ;; into `c-beginning-of-statement-1', so we avoid this extra pass which
8096 ;; potentially can search over a large amount of text.). Take special
8097 ;; pains not to get mislead by C++'s "operator=", and the like.
8098 (if (and (eq move
'previous
)
8099 (c-with-syntax-table (if (c-major-mode-is 'c
++-mode
)
8100 c
++-template-syntax-table
8105 (while ; keep going back to "[;={"s until we either find
8106 ; no more, or get to one which isn't an "operator ="
8107 (and (c-syntactic-re-search-forward "[;={]" start t t t
)
8108 (eq (char-before) ?
=)
8109 c-overloadable-operators-regexp
8110 c-opt-op-identifier-prefix
8112 (eq (c-backward-token-2) 0)
8113 (looking-at c-overloadable-operators-regexp
)
8114 (eq (c-backward-token-2) 0)
8115 (looking-at c-opt-op-identifier-prefix
))))
8116 (eq (char-before) ?
=))
8117 (c-syntactic-re-search-forward "[;{]" start t t
)
8118 (eq (char-before) ?
{)
8119 (c-safe (goto-char (c-up-list-forward (point))) t
)
8120 (not (c-syntactic-re-search-forward ";" start t t
))))))
8124 (defun c-end-of-decl-1 ()
8125 ;; Assuming point is at the start of a declaration (as detected by
8126 ;; e.g. `c-beginning-of-decl-1'), go to the end of it. Unlike
8127 ;; `c-beginning-of-decl-1', this function handles the case when a
8128 ;; block is followed by identifiers in e.g. struct declarations in C
8129 ;; or C++. If a proper end was found then t is returned, otherwise
8130 ;; point is moved as far as possible within the current sexp and nil
8131 ;; is returned. This function doesn't handle macros; use
8132 ;; `c-end-of-macro' instead in those cases.
8134 ;; This function might do hidden buffer changes.
8135 (let ((start (point))
8136 (decl-syntax-table (if (c-major-mode-is 'c
++-mode
)
8137 c
++-template-syntax-table
8140 (c-search-decl-header-end)
8142 (when (and c-recognize-knr-p
8143 (eq (char-before) ?\
;)
8144 (c-in-knr-argdecl start
))
8145 ;; Stopped at the ';' in a K&R argdecl section which is
8146 ;; detected using the same criteria as in
8147 ;; `c-beginning-of-decl-1'. Move to the following block
8149 (c-syntactic-re-search-forward "{" nil
'move t
))
8151 (when (eq (char-before) ?
{)
8152 ;; Encountered a block in the declaration. Jump over it.
8154 (goto-char (c-up-list-forward (point)))
8155 (error (goto-char (point-max))
8156 (throw 'return nil
)))
8157 (if (or (not c-opt-block-decls-with-vars-key
)
8159 (c-with-syntax-table decl-syntax-table
8160 (let ((lim (point)))
8163 ;; Check for `c-opt-block-decls-with-vars-key'
8164 ;; before the first paren.
8165 (c-syntactic-re-search-forward
8166 (concat "[;=\(\[{]\\|\\("
8167 c-opt-block-decls-with-vars-key
8171 (not (eq (char-before) ?_
))
8172 ;; Check that the first following paren is
8174 (c-syntactic-re-search-forward "[;=\(\[{]"
8176 (eq (char-before) ?
{)))))))
8177 ;; The declaration doesn't have any of the
8178 ;; `c-opt-block-decls-with-vars' keywords in the
8179 ;; beginning, so it ends here at the end of the block.
8182 (c-with-syntax-table decl-syntax-table
8184 (if (eq (char-before) ?\
;)
8186 (c-syntactic-re-search-forward ";" nil
'move t
))))
8189 (defun c-looking-at-decl-block (containing-sexp goto-start
&optional limit
)
8190 ;; Assuming the point is at an open brace, check if it starts a
8191 ;; block that contains another declaration level, i.e. that isn't a
8192 ;; statement block or a brace list, and if so return non-nil.
8194 ;; If the check is successful, the return value is the start of the
8195 ;; keyword that tells what kind of construct it is, i.e. typically
8196 ;; what `c-decl-block-key' matched. Also, if GOTO-START is set then
8197 ;; the point will be at the start of the construct, before any
8198 ;; leading specifiers, otherwise it's at the returned position.
8200 ;; The point is clobbered if the check is unsuccessful.
8202 ;; CONTAINING-SEXP is the position of the open of the surrounding
8203 ;; paren, or nil if none.
8205 ;; The optional LIMIT limits the backward search for the start of
8206 ;; the construct. It's assumed to be at a syntactically relevant
8209 ;; If any template arglists are found in the searched region before
8210 ;; the open brace, they get marked with paren syntax.
8212 ;; This function might do hidden buffer changes.
8214 (let ((open-brace (point)) kwd-start first-specifier-pos
)
8215 (c-syntactic-skip-backward c-block-prefix-charset limit t
)
8217 (when (and c-recognize-
<>-arglists
8218 (eq (char-before) ?
>))
8219 ;; Could be at the end of a template arglist.
8220 (let ((c-parse-and-markup-<>-arglists t
)
8221 (c-disallow-comma-in-<>-arglists
8222 (and containing-sexp
8223 (not (eq (char-after containing-sexp
) ?
{)))))
8225 (c-backward-<>-arglist nil limit
)
8227 (c-syntactic-skip-backward c-block-prefix-charset limit t
)
8228 (eq (char-before) ?
>))))))
8230 ;; Note: Can't get bogus hits inside template arglists below since they
8231 ;; have gotten paren syntax above.
8233 ;; If `goto-start' is set we begin by searching for the
8234 ;; first possible position of a leading specifier list.
8235 ;; The `c-decl-block-key' search continues from there since
8236 ;; we know it can't match earlier.
8238 (when (c-syntactic-re-search-forward c-symbol-start
8240 (goto-char (setq first-specifier-pos
(match-beginning 0)))
8245 ((c-syntactic-re-search-forward c-decl-block-key open-brace t t t
)
8246 (goto-char (setq kwd-start
(match-beginning 0)))
8249 ;; Found a keyword that can't be a type?
8252 ;; Can be a type too, in which case it's the return type of a
8253 ;; function (under the assumption that no declaration level
8254 ;; block construct starts with a type).
8255 (not (c-forward-type))
8257 ;; Jumped over a type, but it could be a declaration keyword
8258 ;; followed by the declared identifier that we've jumped over
8259 ;; instead (e.g. in "class Foo {"). If it indeed is a type
8260 ;; then we should be at the declarator now, so check for a
8261 ;; valid declarator start.
8263 ;; Note: This doesn't cope with the case when a declared
8264 ;; identifier is followed by e.g. '(' in a language where '('
8265 ;; also might be part of a declarator expression. Currently
8266 ;; there's no such language.
8267 (not (or (looking-at c-symbol-start
)
8268 (looking-at c-type-decl-prefix-key
)))))
8270 ;; In Pike a list of modifiers may be followed by a brace
8271 ;; to make them apply to many identifiers. Note that the
8272 ;; match data will be empty on return in this case.
8273 ((and (c-major-mode-is 'pike-mode
)
8275 (goto-char open-brace
)
8276 (= (c-backward-token-2) 0))
8277 (looking-at c-specifier-key
)
8278 ;; Use this variant to avoid yet another special regexp.
8279 (c-keyword-member (c-keyword-sym (match-string 1))
8281 (setq kwd-start
(point))
8287 ;; Back up over any preceding specifiers and their clauses
8288 ;; by going forward from `first-specifier-pos', which is the
8289 ;; earliest possible position where the specifier list can
8292 (goto-char first-specifier-pos
)
8294 (while (< (point) kwd-start
)
8295 (if (looking-at c-symbol-key
)
8296 ;; Accept any plain symbol token on the ground that
8297 ;; it's a specifier masked through a macro (just
8298 ;; like `c-forward-decl-or-cast-1' skip forward over
8301 ;; Could be more restrictive wrt invalid keywords,
8302 ;; but that'd only occur in invalid code so there's
8303 ;; no use spending effort on it.
8304 (let ((end (match-end 0)))
8305 (unless (c-forward-keyword-clause 0)
8307 (c-forward-syntactic-ws)))
8309 ;; Can't parse a declaration preamble and is still
8310 ;; before `kwd-start'. That means `first-specifier-pos'
8311 ;; was in some earlier construct. Search again.
8312 (if (c-syntactic-re-search-forward c-symbol-start
8314 (goto-char (setq first-specifier-pos
(match-beginning 0)))
8315 ;; Got no preamble before the block declaration keyword.
8316 (setq first-specifier-pos kwd-start
))))
8318 (goto-char first-specifier-pos
))
8319 (goto-char kwd-start
))
8323 (defun c-search-uplist-for-classkey (paren-state)
8324 ;; Check if the closest containing paren sexp is a declaration
8325 ;; block, returning a 2 element vector in that case. Aref 0
8326 ;; contains the bufpos at boi of the class key line, and aref 1
8327 ;; contains the bufpos of the open brace. This function is an
8328 ;; obsolete wrapper for `c-looking-at-decl-block'.
8330 ;; This function might do hidden buffer changes.
8331 (let ((open-paren-pos (c-most-enclosing-brace paren-state
)))
8332 (when open-paren-pos
8334 (goto-char open-paren-pos
)
8335 (when (and (eq (char-after) ?
{)
8336 (c-looking-at-decl-block
8337 (c-safe-position open-paren-pos paren-state
)
8339 (back-to-indentation)
8340 (vector (point) open-paren-pos
))))))
8342 (defmacro c-pull-open-brace
(ps)
8343 ;; Pull the next open brace from PS (which has the form of paren-state),
8344 ;; skipping over any brace pairs. Returns NIL when PS is exhausted.
8346 (while (consp (car ,ps
))
8347 (setq ,ps
(cdr ,ps
)))
8349 (setq ,ps
(cdr ,ps
)))))
8351 (defun c-most-enclosing-decl-block (paren-state)
8352 ;; Return the buffer position of the most enclosing decl-block brace (in the
8353 ;; sense of c-looking-at-decl-block) in the PAREN-STATE structure, or nil if
8355 (let* ((open-brace (c-pull-open-brace paren-state
))
8356 (next-open-brace (c-pull-open-brace paren-state
)))
8357 (while (and open-brace
8359 (goto-char open-brace
)
8360 (not (c-looking-at-decl-block next-open-brace nil
))))
8361 (setq open-brace next-open-brace
8362 next-open-brace
(c-pull-open-brace paren-state
)))
8365 (defun c-cheap-inside-bracelist-p (paren-state)
8366 ;; Return the position of the L-brace if point is inside a brace list
8367 ;; initialization of an array, etc. This is an approximate function,
8368 ;; designed for speed over accuracy. It will not find every bracelist, but
8369 ;; a non-nil result is reliable. We simply search for "= {" (naturally with
8370 ;; syntactic whitespace allowed). PAREN-STATE is the normal thing that it
8371 ;; is everywhere else.
8375 (and (setq b-pos
(c-pull-open-brace paren-state
))
8376 (progn (goto-char b-pos
)
8378 (c-backward-token-2)
8379 (not (looking-at "=")))))
8382 (defun c-inside-bracelist-p (containing-sexp paren-state
)
8383 ;; return the buffer position of the beginning of the brace list
8384 ;; statement if we're inside a brace list, otherwise return nil.
8385 ;; CONTAINING-SEXP is the buffer pos of the innermost containing
8386 ;; paren. PAREN-STATE is the remainder of the state of enclosing
8389 ;; N.B.: This algorithm can potentially get confused by cpp macros
8390 ;; placed in inconvenient locations. It's a trade-off we make for
8393 ;; This function might do hidden buffer changes.
8395 ;; This will pick up brace list declarations.
8398 (goto-char containing-sexp
)
8401 (if (and (or (looking-at c-brace-list-key
)
8402 (progn (c-forward-sexp -
1)
8403 (looking-at c-brace-list-key
)))
8404 (setq bracepos
(c-down-list-forward (point)))
8405 (not (c-crosses-statement-barrier-p (point)
8408 ;; this will pick up array/aggregate init lists, even if they are nested.
8411 ;; Pike can have class definitions anywhere, so we must
8412 ;; check for the class key here.
8413 (and (c-major-mode-is 'pike-mode
)
8415 bufpos braceassignp lim next-containing
)
8416 (while (and (not bufpos
)
8419 (if (consp (car paren-state
))
8420 (setq lim
(cdr (car paren-state
))
8421 paren-state
(cdr paren-state
))
8422 (setq lim
(car paren-state
)))
8424 (setq next-containing
(car paren-state
)
8425 paren-state
(cdr paren-state
))))
8426 (goto-char containing-sexp
)
8427 (if (c-looking-at-inexpr-block next-containing next-containing
)
8428 ;; We're in an in-expression block of some kind. Do not
8429 ;; check nesting. We deliberately set the limit to the
8430 ;; containing sexp, so that c-looking-at-inexpr-block
8431 ;; doesn't check for an identifier before it.
8432 (setq containing-sexp nil
)
8433 ;; see if the open brace is preceded by = or [...] in
8434 ;; this statement, but watch out for operator=
8435 (setq braceassignp
'dontknow
)
8436 (c-backward-token-2 1 t lim
)
8437 ;; Checks to do only on the first sexp before the brace.
8438 (when (and c-opt-inexpr-brace-list-key
8439 (eq (char-after) ?\
[))
8440 ;; In Java, an initialization brace list may follow
8441 ;; directly after "new Foo[]", so check for a "new"
8443 (while (eq braceassignp
'dontknow
)
8445 (cond ((/= (c-backward-token-2 1 t lim
) 0) nil
)
8446 ((looking-at c-opt-inexpr-brace-list-key
) t
)
8447 ((looking-at "\\sw\\|\\s_\\|[.[]")
8448 ;; Carry on looking if this is an
8449 ;; identifier (may contain "." in Java)
8450 ;; or another "[]" sexp.
8453 ;; Checks to do on all sexps before the brace, up to the
8454 ;; beginning of the statement.
8455 (while (eq braceassignp
'dontknow
)
8456 (cond ((eq (char-after) ?\
;)
8457 (setq braceassignp nil
))
8459 (looking-at class-key
))
8460 (setq braceassignp nil
))
8461 ((eq (char-after) ?
=)
8462 ;; We've seen a =, but must check earlier tokens so
8463 ;; that it isn't something that should be ignored.
8464 (setq braceassignp
'maybe
)
8465 (while (and (eq braceassignp
'maybe
)
8466 (zerop (c-backward-token-2 1 t lim
)))
8469 ;; Check for operator =
8470 ((and c-opt-op-identifier-prefix
8471 (looking-at c-opt-op-identifier-prefix
))
8473 ;; Check for `<opchar>= in Pike.
8474 ((and (c-major-mode-is 'pike-mode
)
8475 (or (eq (char-after) ?
`)
8476 ;; Special case for Pikes
8477 ;; `[]=, since '[' is not in
8478 ;; the punctuation class.
8479 (and (eq (char-after) ?\
[)
8480 (eq (char-before) ?
`))))
8482 ((looking-at "\\s.") 'maybe
)
8483 ;; make sure we're not in a C++ template
8484 ;; argument assignment
8486 (c-major-mode-is 'c
++-mode
)
8488 (let ((here (point))
8490 (skip-chars-backward "^<>")
8492 (and (eq (char-before) ?
<)
8493 (not (c-crosses-statement-barrier-p
8495 (not (c-in-literal))
8499 (if (and (eq braceassignp
'dontknow
)
8500 (/= (c-backward-token-2 1 t lim
) 0))
8501 (setq braceassignp nil
)))
8502 (if (not braceassignp
)
8503 (if (eq (char-after) ?\
;)
8504 ;; Brace lists can't contain a semicolon, so we're done.
8505 (setq containing-sexp nil
)
8507 (setq containing-sexp next-containing
8509 next-containing nil
))
8510 ;; we've hit the beginning of the aggregate list
8511 (c-beginning-of-statement-1
8512 (c-most-enclosing-brace paren-state
))
8513 (setq bufpos
(point))))
8518 (defun c-looking-at-special-brace-list (&optional lim
)
8519 ;; If we're looking at the start of a pike-style list, ie `({Â })',
8520 ;; `([Â ])', `(<Â >)' etc, a cons of a cons of its starting and ending
8521 ;; positions and its entry in c-special-brace-lists is returned, nil
8522 ;; otherwise. The ending position is nil if the list is still open.
8523 ;; LIM is the limit for forward search. The point may either be at
8524 ;; the `(' or at the following paren character. Tries to check the
8525 ;; matching closer, but assumes it's correct if no balanced paren is
8526 ;; found (i.e. the case `({ ... } ... )' is detected as _not_ being
8527 ;; a special brace list).
8529 ;; This function might do hidden buffer changes.
8530 (if c-special-brace-lists
8535 (c-forward-syntactic-ws)
8536 (if (eq (char-after) ?\
()
8539 (c-forward-syntactic-ws)
8540 (setq inner-beg
(point))
8541 (setq type
(assq (char-after) c-special-brace-lists
)))
8542 (if (setq type
(assq (char-after) c-special-brace-lists
))
8544 (setq inner-beg
(point))
8545 (c-backward-syntactic-ws)
8547 (setq beg
(if (eq (char-after) ?\
()
8555 (= (char-before) ?\
)))
8557 (goto-char inner-beg
)
8558 (if (looking-at "\\s(")
8559 ;; Check balancing of the inner paren
8564 ;; If the inner char isn't a paren then
8565 ;; we can't check balancing, so just
8566 ;; check the char before the outer
8570 (c-backward-syntactic-ws)
8571 (= (char-before) (cdr type
)))))
8572 (if (or (/= (char-syntax (char-before)) ?\
))
8574 (c-forward-syntactic-ws)
8577 (cons (cons beg end
) type
))
8578 (cons (list beg
) type
)))))
8581 (defun c-looking-at-bos (&optional lim
)
8582 ;; Return non-nil if between two statements or declarations, assuming
8583 ;; point is not inside a literal or comment.
8585 ;; Obsolete - `c-at-statement-start-p' or `c-at-expression-start-p'
8586 ;; are recommended instead.
8588 ;; This function might do hidden buffer changes.
8589 (c-at-statement-start-p))
8590 (make-obsolete 'c-looking-at-bos
'c-at-statement-start-p
"22.1")
8592 (defun c-looking-at-inexpr-block (lim containing-sexp
&optional check-at-end
)
8593 ;; Return non-nil if we're looking at the beginning of a block
8594 ;; inside an expression. The value returned is actually a cons of
8595 ;; either 'inlambda, 'inexpr-statement or 'inexpr-class and the
8596 ;; position of the beginning of the construct.
8598 ;; LIM limits the backward search. CONTAINING-SEXP is the start
8599 ;; position of the closest containing list. If it's nil, the
8600 ;; containing paren isn't used to decide whether we're inside an
8601 ;; expression or not. If both LIM and CONTAINING-SEXP are used, LIM
8602 ;; needs to be farther back.
8604 ;; If CHECK-AT-END is non-nil then extra checks at the end of the
8605 ;; brace block might be done. It should only be used when the
8606 ;; construct can be assumed to be complete, i.e. when the original
8607 ;; starting position was further down than that.
8609 ;; This function might do hidden buffer changes.
8612 (let ((res 'maybe
) passed-paren
8613 (closest-lim (or containing-sexp lim
(point-min)))
8614 ;; Look at the character after point only as a last resort
8615 ;; when we can't disambiguate.
8616 (block-follows (and (eq (char-after) ?
{) (point))))
8618 (while (and (eq res
'maybe
)
8619 (progn (c-backward-syntactic-ws)
8620 (> (point) closest-lim
))
8622 (progn (backward-char)
8623 (looking-at "[\]\).]\\|\\w\\|\\s_"))
8624 (c-safe (forward-char)
8625 (goto-char (scan-sexps (point) -
1))))
8628 (if (looking-at c-keywords-regexp
)
8629 (let ((kw-sym (c-keyword-sym (match-string 1))))
8632 (c-keyword-member kw-sym
'c-inexpr-class-kwds
))
8633 (and (not (eq passed-paren ?\
[))
8634 (or (not (looking-at c-class-key
))
8635 ;; If the class definition is at the start of
8636 ;; a statement, we don't consider it an
8637 ;; in-expression class.
8638 (let ((prev (point)))
8640 (= (c-backward-token-2 1 nil closest-lim
) 0)
8641 (eq (char-syntax (char-after)) ?w
))
8642 (setq prev
(point)))
8644 (not (c-at-statement-start-p)))
8645 ;; Also, in Pike we treat it as an
8646 ;; in-expression class if it's used in an
8647 ;; object clone expression.
8650 (c-major-mode-is 'pike-mode
)
8651 (progn (goto-char block-follows
)
8652 (zerop (c-forward-token-2 1 t
)))
8653 (eq (char-after) ?\
())))
8654 (cons 'inexpr-class
(point))))
8655 ((c-keyword-member kw-sym
'c-inexpr-block-kwds
)
8656 (when (not passed-paren
)
8657 (cons 'inexpr-statement
(point))))
8658 ((c-keyword-member kw-sym
'c-lambda-kwds
)
8659 (when (or (not passed-paren
)
8660 (eq passed-paren ?\
())
8661 (cons 'inlambda
(point))))
8662 ((c-keyword-member kw-sym
'c-block-stmt-kwds
)
8667 (if (looking-at "\\s(")
8669 (if (and (eq passed-paren ?\
[)
8670 (eq (char-after) ?\
[))
8671 ;; Accept several square bracket sexps for
8672 ;; Java array initializations.
8674 (setq passed-paren
(char-after))
8679 (when (and c-recognize-paren-inexpr-blocks
8682 (eq (char-after containing-sexp
) ?\
())
8683 (goto-char containing-sexp
)
8684 (if (or (save-excursion
8685 (c-backward-syntactic-ws lim
)
8686 (and (> (point) (or lim
(point-min)))
8688 (and c-special-brace-lists
8689 (c-looking-at-special-brace-list)))
8691 (cons 'inexpr-statement
(point))))
8695 (defun c-looking-at-inexpr-block-backward (paren-state)
8696 ;; Returns non-nil if we're looking at the end of an in-expression
8697 ;; block, otherwise the same as `c-looking-at-inexpr-block'.
8698 ;; PAREN-STATE is the paren state relevant at the current position.
8700 ;; This function might do hidden buffer changes.
8702 ;; We currently only recognize a block.
8703 (let ((here (point))
8704 (elem (car-safe paren-state
))
8706 (when (and (consp elem
)
8707 (progn (goto-char (cdr elem
))
8708 (c-forward-syntactic-ws here
)
8710 (goto-char (car elem
))
8711 (if (setq paren-state
(cdr paren-state
))
8712 (setq containing-sexp
(car-safe paren-state
)))
8713 (c-looking-at-inexpr-block (c-safe-position containing-sexp
8715 containing-sexp
)))))
8717 (defun c-at-macro-vsemi-p (&optional pos
)
8718 ;; Is there a "virtual semicolon" at POS or point?
8719 ;; (See cc-defs.el for full details of "virtual semicolons".)
8721 ;; This is true when point is at the last non syntactic WS position on the
8722 ;; line, there is a macro call last on the line, and this particular macro's
8723 ;; name is defined by the regexp `c-vs-macro-regexp' as not needing a
8732 c-macro-with-semi-re
8733 (eq (skip-chars-backward " \t") 0)
8735 ;; Check we've got nothing after this except comments and empty lines
8736 ;; joined by escaped EOLs.
8737 (skip-chars-forward " \t") ; always returns non-nil.
8739 (while ; go over 1 block comment per iteration.
8741 (looking-at "\\(\\\\[\n\r][ \t]*\\)*")
8742 (goto-char (match-end 0))
8744 ((looking-at c-block-comment-start-regexp
)
8745 (and (forward-comment 1)
8746 (skip-chars-forward " \t"))) ; always returns non-nil
8747 ((looking-at c-line-comment-start-regexp
)
8754 (progn (c-backward-syntactic-ws)
8757 ;; Check for one of the listed macros being before point.
8758 (or (not (eq (char-before) ?\
)))
8759 (when (c-go-list-backward)
8760 (c-backward-syntactic-ws)
8762 (c-simple-skip-symbol-backward)
8763 (looking-at c-macro-with-semi-re
)
8765 (not (c-in-literal)))))) ; The most expensive check last.
8767 (defun c-macro-vsemi-status-unknown-p () t
) ; See cc-defs.el.
8770 ;; `c-guess-basic-syntax' and the functions that precedes it below
8771 ;; implements the main decision tree for determining the syntactic
8772 ;; analysis of the current line of code.
8774 ;; Dynamically bound to t when `c-guess-basic-syntax' is called during
8775 ;; auto newline analysis.
8776 (defvar c-auto-newline-analysis nil
)
8778 (defun c-brace-anchor-point (bracepos)
8779 ;; BRACEPOS is the position of a brace in a construct like "namespace
8780 ;; Bar {". Return the anchor point in this construct; this is the
8781 ;; earliest symbol on the brace's line which isn't earlier than
8784 ;; Currently (2007-08-17), "like namespace" means "matches
8785 ;; c-other-block-decl-kwds". It doesn't work with "class" or "struct"
8786 ;; or anything like that.
8788 (let ((boi (c-point 'boi bracepos
)))
8789 (goto-char bracepos
)
8790 (while (and (> (point) boi
)
8791 (not (looking-at c-other-decl-block-key
)))
8792 (c-backward-token-2))
8793 (if (> (point) boi
) (point) boi
))))
8795 (defsubst c-add-syntax
(symbol &rest args
)
8796 ;; A simple function to prepend a new syntax element to
8797 ;; `c-syntactic-context'. Using `setq' on it is unsafe since it
8798 ;; should always be dynamically bound but since we read it first
8799 ;; we'll fail properly anyway if this function is misused.
8800 (setq c-syntactic-context
(cons (cons symbol args
)
8801 c-syntactic-context
)))
8803 (defsubst c-append-syntax
(symbol &rest args
)
8804 ;; Like `c-add-syntax' but appends to the end of the syntax list.
8805 ;; (Normally not necessary.)
8806 (setq c-syntactic-context
(nconc c-syntactic-context
8807 (list (cons symbol args
)))))
8809 (defun c-add-stmt-syntax (syntax-symbol
8814 ;; Add the indicated SYNTAX-SYMBOL to `c-syntactic-context', extending it as
8815 ;; needed with further syntax elements of the types `substatement',
8816 ;; `inexpr-statement', `arglist-cont-nonempty', `statement-block-intro', and
8817 ;; `defun-block-intro'.
8819 ;; Do the generic processing to anchor the given syntax symbol on
8820 ;; the preceding statement: Skip over any labels and containing
8821 ;; statements on the same line, and then search backward until we
8822 ;; find a statement or block start that begins at boi without a
8823 ;; label or comment.
8825 ;; Point is assumed to be at the prospective anchor point for the
8826 ;; given SYNTAX-SYMBOL. More syntax entries are added if we need to
8827 ;; skip past open parens and containing statements. Most of the added
8828 ;; syntax elements will get the same anchor point - the exception is
8829 ;; for an anchor in a construct like "namespace"[*] - this is as early
8830 ;; as possible in the construct but on the same line as the {.
8832 ;; [*] i.e. with a keyword matching c-other-block-decl-kwds.
8834 ;; SYNTAX-EXTRA-ARGS are a list of the extra arguments for the
8835 ;; syntax symbol. They are appended after the anchor point.
8837 ;; If STOP-AT-BOI-ONLY is nil, we can stop in the middle of the line
8838 ;; if the current statement starts there.
8840 ;; Note: It's not a problem if PAREN-STATE "overshoots"
8841 ;; CONTAINING-SEXP, i.e. contains info about parens further down.
8843 ;; This function might do hidden buffer changes.
8845 (if (= (point) (c-point 'boi
))
8846 ;; This is by far the most common case, so let's give it special
8848 (apply 'c-add-syntax syntax-symbol
(point) syntax-extra-args
)
8850 (let ((syntax-last c-syntactic-context
)
8851 (boi (c-point 'boi
))
8852 ;; Set when we're on a label, so that we don't stop there.
8853 ;; FIXME: To be complete we should check if we're on a label
8854 ;; now at the start.
8857 ;; Use point as the anchor point for "namespace", "extern", etc.
8858 (apply 'c-add-syntax syntax-symbol
8859 (if (rassq syntax-symbol c-other-decl-block-key-in-symbols-alist
)
8863 ;; Loop while we have to back out of containing blocks.
8866 (catch 'back-up-block
8868 ;; Loop while we have to back up statements.
8869 (while (or (/= (point) boi
)
8871 (looking-at c-comment-start-regexp
))
8873 ;; Skip past any comments that stands between the
8874 ;; statement start and boi.
8875 (let ((savepos (point)))
8876 (while (and (/= savepos boi
)
8877 (c-backward-single-comment))
8878 (setq savepos
(point)
8879 boi
(c-point 'boi
)))
8880 (goto-char savepos
))
8882 ;; Skip to the beginning of this statement or backward
8884 (let ((old-pos (point))
8886 (step-type (c-beginning-of-statement-1 containing-sexp
)))
8887 (setq boi
(c-point 'boi
)
8888 on-label
(eq step-type
'label
))
8890 (cond ((= (point) old-pos
)
8891 ;; If we didn't move we're at the start of a block and
8892 ;; have to continue outside it.
8893 (throw 'back-up-block t
))
8895 ((and (eq step-type
'up
)
8896 (>= (point) old-boi
)
8897 (looking-at "else\\>[^_]")
8900 (looking-at "if\\>[^_]")))
8901 ;; Special case to avoid deeper and deeper indentation
8902 ;; of "else if" clauses.
8905 ((and (not stop-at-boi-only
)
8906 (/= old-pos old-boi
)
8907 (memq step-type
'(up previous
)))
8908 ;; If stop-at-boi-only is nil, we shouldn't back up
8909 ;; over previous or containing statements to try to
8910 ;; reach boi, so go back to the last position and
8913 (throw 'back-up-block nil
))
8916 (if (and (not stop-at-boi-only
)
8917 (memq step-type
'(up previous beginning
)))
8918 ;; If we've moved into another statement then we
8919 ;; should no longer try to stop in the middle of a
8921 (setq stop-at-boi-only t
))
8923 ;; Record this as a substatement if we skipped up one
8925 (when (eq step-type
'up
)
8926 (c-add-syntax 'substatement nil
))))
8931 ;; Now we have to go out of this block.
8932 (goto-char containing-sexp
)
8934 ;; Don't stop in the middle of a special brace list opener
8936 (when c-special-brace-lists
8937 (let ((special-list (c-looking-at-special-brace-list)))
8938 (when (and special-list
8939 (< (car (car special-list
)) (point)))
8940 (setq containing-sexp
(car (car special-list
)))
8941 (goto-char containing-sexp
))))
8943 (setq paren-state
(c-whack-state-after containing-sexp paren-state
)
8944 containing-sexp
(c-most-enclosing-brace paren-state
)
8947 ;; Analyze the construct in front of the block we've stepped out
8948 ;; from and add the right syntactic element for it.
8949 (let ((paren-pos (point))
8950 (paren-char (char-after))
8953 (if (eq paren-char ?\
()
8954 ;; Stepped out of a parenthesis block, so we're in an
8957 (when (/= paren-pos boi
)
8958 (if (and c-recognize-paren-inexpr-blocks
8960 (c-backward-syntactic-ws containing-sexp
)
8961 (or (not (looking-at "\\>"))
8962 (not (c-on-identifier))))
8964 (goto-char (1+ paren-pos
))
8965 (c-forward-syntactic-ws)
8966 (eq (char-after) ?
{)))
8967 ;; Stepped out of an in-expression statement. This
8968 ;; syntactic element won't get an anchor pos.
8969 (c-add-syntax 'inexpr-statement
)
8971 ;; A parenthesis normally belongs to an arglist.
8972 (c-add-syntax 'arglist-cont-nonempty nil paren-pos
)))
8976 (1+ containing-sexp
)
8978 (setq step-type
'same
8981 ;; Stepped out of a brace block.
8982 (setq step-type
(c-beginning-of-statement-1 containing-sexp
)
8983 on-label
(eq step-type
'label
))
8985 (if (and (eq step-type
'same
)
8986 (/= paren-pos
(point)))
8990 (goto-char paren-pos
)
8991 (setq inexpr
(c-looking-at-inexpr-block
8992 (c-safe-position containing-sexp paren-state
)
8994 (c-add-syntax (if (eq (car inexpr
) 'inlambda
)
8996 'statement-block-intro
)
8998 ((looking-at c-other-decl-block-key
)
9000 (cdr (assoc (match-string 1)
9001 c-other-decl-block-key-in-symbols-alist
))
9002 (max (c-point 'boi paren-pos
) (point))))
9003 (t (c-add-syntax 'defun-block-intro nil
))))
9005 (c-add-syntax 'statement-block-intro nil
)))
9007 (if (= paren-pos boi
)
9008 ;; Always done if the open brace was at boi. The
9009 ;; c-beginning-of-statement-1 call above is necessary
9010 ;; anyway, to decide the type of block-intro to add.
9011 (goto-char paren-pos
)
9012 (setq boi
(c-point 'boi
)))
9015 ;; Fill in the current point as the anchor for all the symbols
9017 (let ((p c-syntactic-context
) q
)
9018 (while (not (eq p syntax-last
))
9019 (setq q
(cdr (car p
))) ; e.g. (nil 28) [from (arglist-cont-nonempty nil 28)]
9027 (defun c-add-class-syntax (symbol
9028 containing-decl-open
9029 containing-decl-start
9032 ;; The inclass and class-close syntactic symbols are added in
9033 ;; several places and some work is needed to fix everything.
9034 ;; Therefore it's collected here.
9036 ;; This function might do hidden buffer changes.
9037 (goto-char containing-decl-open
)
9038 (if (and (eq symbol
'inclass
) (= (point) (c-point 'boi
)))
9040 (c-add-syntax symbol containing-decl-open
)
9041 containing-decl-open
)
9042 (goto-char containing-decl-start
)
9043 ;; Ought to use `c-add-stmt-syntax' instead of backing up to boi
9044 ;; here, but we have to do like this for compatibility.
9045 (back-to-indentation)
9046 (c-add-syntax symbol
(point))
9047 (if (and (c-keyword-member containing-decl-kwd
9048 'c-inexpr-class-kwds
)
9049 (/= containing-decl-start
(c-point 'boi containing-decl-start
)))
9050 (c-add-syntax 'inexpr-class
))
9053 (defun c-guess-continued-construct (indent-point
9055 beg-of-same-or-containing-stmt
9058 ;; This function contains the decision tree reached through both
9059 ;; cases 18 and 10. It's a continued statement or top level
9060 ;; construct of some kind.
9062 ;; This function might do hidden buffer changes.
9064 (let (special-brace-list placeholder
)
9065 (goto-char indent-point
)
9066 (skip-chars-forward " \t")
9069 ;; (CASE A removed.)
9070 ;; CASE B: open braces for class or brace-lists
9071 ((setq special-brace-list
9072 (or (and c-special-brace-lists
9073 (c-looking-at-special-brace-list))
9074 (eq char-after-ip ?
{)))
9077 ;; CASE B.1: class-open
9079 (and (eq (char-after) ?
{)
9080 (c-looking-at-decl-block containing-sexp t
)
9081 (setq beg-of-same-or-containing-stmt
(point))))
9082 (c-add-syntax 'class-open beg-of-same-or-containing-stmt
))
9084 ;; CASE B.2: brace-list-open
9085 ((or (consp special-brace-list
)
9087 (goto-char beg-of-same-or-containing-stmt
)
9088 (c-syntactic-re-search-forward "=\\([^=]\\|$\\)"
9089 indent-point t t t
)))
9090 ;; The most semantically accurate symbol here is
9091 ;; brace-list-open, but we normally report it simply as a
9092 ;; statement-cont. The reason is that one normally adjusts
9093 ;; brace-list-open for brace lists as top-level constructs,
9094 ;; and brace lists inside statements is a completely different
9095 ;; context. C.f. case 5A.3.
9096 (c-beginning-of-statement-1 containing-sexp
)
9097 (c-add-stmt-syntax (if c-auto-newline-analysis
9098 ;; Turn off the dwim above when we're
9099 ;; analyzing the nature of the brace
9100 ;; for the auto newline feature.
9104 containing-sexp paren-state
))
9106 ;; CASE B.3: The body of a function declared inside a normal
9107 ;; block. Can occur e.g. in Pike and when using gcc
9108 ;; extensions, but watch out for macros followed by blocks.
9109 ;; C.f. cases E, 16F and 17G.
9110 ((and (not (c-at-statement-start-p))
9111 (eq (c-beginning-of-statement-1 containing-sexp nil nil t
)
9114 (let ((c-recognize-typeless-decls nil
))
9115 ;; Turn off recognition of constructs that lacks a
9116 ;; type in this case, since that's more likely to be
9117 ;; a macro followed by a block.
9118 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
9119 (c-add-stmt-syntax 'defun-open nil t
9120 containing-sexp paren-state
))
9122 ;; CASE B.4: Continued statement with block open. The most
9123 ;; accurate analysis is perhaps `statement-cont' together with
9124 ;; `block-open' but we play DWIM and use `substatement-open'
9125 ;; instead. The rationale is that this typically is a macro
9126 ;; followed by a block which makes it very similar to a
9127 ;; statement with a substatement block.
9129 (c-add-stmt-syntax 'substatement-open nil nil
9130 containing-sexp paren-state
))
9133 ;; CASE C: iostream insertion or extraction operator
9134 ((and (looking-at "\\(<<\\|>>\\)\\([^=]\\|$\\)")
9136 (goto-char beg-of-same-or-containing-stmt
)
9137 ;; If there is no preceding streamop in the statement
9138 ;; then indent this line as a normal statement-cont.
9139 (when (c-syntactic-re-search-forward
9140 "\\(<<\\|>>\\)\\([^=]\\|$\\)" indent-point
'move t t
)
9141 (c-add-syntax 'stream-op
(c-point 'boi
))
9144 ;; CASE E: In the "K&R region" of a function declared inside a
9145 ;; normal block. C.f. case B.3.
9146 ((and (save-excursion
9147 ;; Check that the next token is a '{'. This works as
9148 ;; long as no language that allows nested function
9149 ;; definitions allows stuff like member init lists, K&R
9150 ;; declarations or throws clauses there.
9152 ;; Note that we do a forward search for something ahead
9153 ;; of the indentation line here. That's not good since
9154 ;; the user might not have typed it yet. Unfortunately
9155 ;; it's exceedingly tricky to recognize a function
9156 ;; prototype in a code block without resorting to this.
9157 (c-forward-syntactic-ws)
9158 (eq (char-after) ?
{))
9159 (not (c-at-statement-start-p))
9160 (eq (c-beginning-of-statement-1 containing-sexp nil nil t
)
9163 (let ((c-recognize-typeless-decls nil
))
9164 ;; Turn off recognition of constructs that lacks a
9165 ;; type in this case, since that's more likely to be
9166 ;; a macro followed by a block.
9167 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
9168 (c-add-stmt-syntax 'func-decl-cont nil t
9169 containing-sexp paren-state
))
9171 ;;CASE F: continued statement and the only preceding items are
9173 ((and (c-major-mode-is 'java-mode
)
9174 (setq placeholder
(point))
9175 (c-beginning-of-statement-1)
9177 (while (and (c-forward-annotation)
9178 (< (point) placeholder
))
9179 (c-forward-syntactic-ws))
9182 (>= (point) placeholder
)
9183 (goto-char placeholder
)))
9184 (c-beginning-of-statement-1 containing-sexp
)
9185 (c-add-syntax 'annotation-var-cont
(point)))
9187 ;; CASE G: a template list continuation?
9188 ;; Mostly a duplication of case 5D.3 to fix templates-19:
9189 ((and (c-major-mode-is 'c
++-mode
)
9191 (goto-char indent-point
)
9192 (c-with-syntax-table c
++-template-syntax-table
9193 (setq placeholder
(c-up-list-backward)))
9195 (eq (char-after placeholder
) ?
<)
9196 (/= (char-before placeholder
) ?
<)
9198 (goto-char (1+ placeholder
))
9199 (not (looking-at c-
<-op-cont-regexp
))))))
9200 (c-with-syntax-table c
++-template-syntax-table
9201 (goto-char placeholder
)
9202 (c-beginning-of-statement-1 containing-sexp t
)
9204 (c-backward-syntactic-ws containing-sexp
)
9205 (eq (char-before) ?
<))
9206 ;; In a nested template arglist.
9208 (goto-char placeholder
)
9209 (c-syntactic-skip-backward "^,;" containing-sexp t
)
9210 (c-forward-syntactic-ws))
9211 (back-to-indentation)))
9212 ;; FIXME: Should use c-add-stmt-syntax, but it's not yet
9214 (c-add-syntax 'template-args-cont
(point) placeholder
))
9216 ;; CASE D: continued statement.
9218 (c-beginning-of-statement-1 containing-sexp
)
9219 (c-add-stmt-syntax 'statement-cont nil nil
9220 containing-sexp paren-state
))
9223 ;; The next autoload was added by RMS on 2005/8/9 - don't know why (ACM,
9226 (defun c-guess-basic-syntax ()
9227 "Return the syntactic context of the current line."
9230 (c-save-buffer-state
9231 ((indent-point (point))
9232 (case-fold-search nil
)
9233 ;; A whole ugly bunch of various temporary variables. Have
9234 ;; to declare them here since it's not possible to declare
9235 ;; a variable with only the scope of a cond test and the
9236 ;; following result clauses, and most of this function is a
9237 ;; single gigantic cond. :P
9238 literal char-before-ip before-ws-ip char-after-ip macro-start
9239 in-macro-expr c-syntactic-context placeholder c-in-literal-cache
9240 step-type tmpsymbol keyword injava-inher special-brace-list tmp-pos
9242 ;; The following record some positions for the containing
9243 ;; declaration block if we're directly within one:
9244 ;; `containing-decl-open' is the position of the open
9245 ;; brace. `containing-decl-start' is the start of the
9246 ;; declaration. `containing-decl-kwd' is the keyword
9247 ;; symbol of the keyword that tells what kind of block it
9249 containing-decl-open
9250 containing-decl-start
9252 ;; The open paren of the closest surrounding sexp or nil if
9255 ;; The position after the closest preceding brace sexp
9256 ;; (nested sexps are ignored), or the position after
9257 ;; `containing-sexp' if there is none, or (point-min) if
9258 ;; `containing-sexp' is nil.
9260 ;; The paren state outside `containing-sexp', or at
9261 ;; `indent-point' if `containing-sexp' is nil.
9262 (paren-state (c-parse-state))
9263 ;; There's always at most one syntactic element which got
9264 ;; an anchor pos. It's stored in syntactic-relpos.
9266 (c-stmt-delim-chars c-stmt-delim-chars
))
9268 ;; Check if we're directly inside an enclosing declaration
9270 (when (and (setq containing-sexp
9271 (c-most-enclosing-brace paren-state
))
9273 (goto-char containing-sexp
)
9274 (eq (char-after) ?
{))
9276 (c-looking-at-decl-block
9277 (c-most-enclosing-brace paren-state
9280 (setq containing-decl-open containing-sexp
9281 containing-decl-start
(point)
9282 containing-sexp nil
)
9283 (goto-char placeholder
)
9284 (setq containing-decl-kwd
(and (looking-at c-keywords-regexp
)
9285 (c-keyword-sym (match-string 1)))))
9287 ;; Init some position variables.
9290 (setq containing-sexp
(car paren-state
)
9291 paren-state
(cdr paren-state
))
9292 (if (consp containing-sexp
)
9294 (setq lim
(cdr containing-sexp
))
9295 (if (cdr c-state-cache
)
9296 ;; Ignore balanced paren. The next entry
9297 ;; can't be another one.
9298 (setq containing-sexp
(car (cdr c-state-cache
))
9299 paren-state
(cdr paren-state
))
9300 ;; If there is no surrounding open paren then
9301 ;; put the last balanced pair back on paren-state.
9302 (setq paren-state
(cons containing-sexp paren-state
)
9303 containing-sexp nil
)))
9304 (setq lim
(1+ containing-sexp
))))
9305 (setq lim
(point-min)))
9306 (when (c-beginning-of-macro)
9307 (goto-char indent-point
)
9308 (let ((lim1 (c-determine-limit 2000)))
9309 (setq lim
(max lim lim1
))))
9311 ;; If we're in a parenthesis list then ',' delimits the
9312 ;; "statements" rather than being an operator (with the
9313 ;; exception of the "for" clause). This difference is
9314 ;; typically only noticeable when statements are used in macro
9316 (when (and containing-sexp
9317 (eq (char-after containing-sexp
) ?\
())
9318 (setq c-stmt-delim-chars c-stmt-delim-chars-with-comma
))
9319 ;; cache char before and after indent point, and move point to
9320 ;; the most likely position to perform the majority of tests
9321 (goto-char indent-point
)
9322 (c-backward-syntactic-ws lim
)
9323 (setq before-ws-ip
(point)
9324 char-before-ip
(char-before))
9325 (goto-char indent-point
)
9326 (skip-chars-forward " \t")
9327 (setq char-after-ip
(char-after))
9329 ;; are we in a literal?
9330 (setq literal
(c-in-literal lim
))
9332 ;; now figure out syntactic qualities of the current line
9335 ;; CASE 1: in a string.
9336 ((eq literal
'string
)
9337 (c-add-syntax 'string
(c-point 'bopl
)))
9339 ;; CASE 2: in a C or C++ style comment.
9340 ((and (memq literal
'(c c
++))
9341 ;; This is a kludge for XEmacs where we use
9342 ;; `buffer-syntactic-context', which doesn't correctly
9343 ;; recognize "\*/" to end a block comment.
9344 ;; `parse-partial-sexp' which is used by
9345 ;; `c-literal-limits' will however do that in most
9346 ;; versions, which results in that we get nil from
9347 ;; `c-literal-limits' even when `c-in-literal' claims
9348 ;; we're inside a comment.
9349 (setq placeholder
(c-literal-limits lim
)))
9350 (c-add-syntax literal
(car placeholder
)))
9352 ;; CASE 3: in a cpp preprocessor macro continuation.
9353 ((and (save-excursion
9354 (when (c-beginning-of-macro)
9355 (setq macro-start
(point))))
9356 (/= macro-start
(c-point 'boi
))
9358 (setq tmpsymbol
'cpp-macro-cont
)
9359 (or (not c-syntactic-indentation-in-macros
)
9361 (goto-char macro-start
)
9362 ;; If at the beginning of the body of a #define
9363 ;; directive then analyze as cpp-define-intro
9364 ;; only. Go on with the syntactic analysis
9365 ;; otherwise. in-macro-expr is set if we're in a
9366 ;; cpp expression, i.e. before the #define body
9367 ;; or anywhere in a non-#define directive.
9368 (if (c-forward-to-cpp-define-body)
9369 (let ((indent-boi (c-point 'boi indent-point
)))
9370 (setq in-macro-expr
(> (point) indent-boi
)
9371 tmpsymbol
'cpp-define-intro
)
9372 (= (point) indent-boi
))
9373 (setq in-macro-expr t
)
9375 (c-add-syntax tmpsymbol macro-start
)
9376 (setq macro-start nil
))
9378 ;; CASE 11: an else clause?
9379 ((looking-at "else\\>[^_]")
9380 (c-beginning-of-statement-1 containing-sexp
)
9381 (c-add-stmt-syntax 'else-clause nil t
9382 containing-sexp paren-state
))
9384 ;; CASE 12: while closure of a do/while construct?
9385 ((and (looking-at "while\\>[^_]")
9387 (prog1 (eq (c-beginning-of-statement-1 containing-sexp
)
9389 (setq placeholder
(point)))))
9390 (goto-char placeholder
)
9391 (c-add-stmt-syntax 'do-while-closure nil t
9392 containing-sexp paren-state
))
9394 ;; CASE 13: A catch or finally clause? This case is simpler
9395 ;; than if-else and do-while, because a block is required
9396 ;; after every try, catch and finally.
9398 (and (cond ((c-major-mode-is 'c
++-mode
)
9399 (looking-at "catch\\>[^_]"))
9400 ((c-major-mode-is 'java-mode
)
9401 (looking-at "\\(catch\\|finally\\)\\>[^_]")))
9402 (and (c-safe (c-backward-syntactic-ws)
9405 (eq (char-after) ?
{)
9406 (c-safe (c-backward-syntactic-ws)
9409 (if (eq (char-after) ?\
()
9410 (c-safe (c-backward-sexp) t
)
9412 (looking-at "\\(try\\|catch\\)\\>[^_]")
9413 (setq placeholder
(point))))
9414 (goto-char placeholder
)
9415 (c-add-stmt-syntax 'catch-clause nil t
9416 containing-sexp paren-state
))
9418 ;; CASE 18: A substatement we can recognize by keyword.
9420 (and c-opt-block-stmt-key
9421 (not (eq char-before-ip ?\
;))
9422 (not (c-at-vsemi-p before-ws-ip
))
9423 (not (memq char-after-ip
'(?\
) ?\
] ?
,)))
9424 (or (not (eq char-before-ip ?
}))
9425 (c-looking-at-inexpr-block-backward c-state-cache
))
9428 ;; Ought to cache the result from the
9429 ;; c-beginning-of-statement-1 calls here.
9430 (setq placeholder
(point))
9431 (while (eq (setq step-type
9432 (c-beginning-of-statement-1 lim
))
9434 (if (eq step-type
'previous
)
9435 (goto-char placeholder
)
9436 (setq placeholder
(point))
9437 (if (and (eq step-type
'same
)
9438 (not (looking-at c-opt-block-stmt-key
)))
9439 ;; Step up to the containing statement if we
9440 ;; stayed in the same one.
9444 (c-beginning-of-statement-1 lim
))
9447 (setq placeholder
(point))
9448 ;; There was no containing statement after all.
9449 (goto-char placeholder
)))))
9451 (if (looking-at c-block-stmt-2-key
)
9452 ;; Require a parenthesis after these keywords.
9453 ;; Necessary to catch e.g. synchronized in Java,
9454 ;; which can be used both as statement and
9456 (and (zerop (c-forward-token-2 1 nil
))
9457 (eq (char-after) ?\
())
9458 (looking-at c-opt-block-stmt-key
))))
9460 (if (eq step-type
'up
)
9461 ;; CASE 18A: Simple substatement.
9463 (goto-char placeholder
)
9465 ((eq char-after-ip ?
{)
9466 (c-add-stmt-syntax 'substatement-open nil nil
9467 containing-sexp paren-state
))
9469 (goto-char indent-point
)
9470 (back-to-indentation)
9472 (c-add-stmt-syntax 'substatement-label nil nil
9473 containing-sexp paren-state
))
9475 (c-add-stmt-syntax 'substatement nil nil
9476 containing-sexp paren-state
))))
9478 ;; CASE 18B: Some other substatement. This is shared
9480 (c-guess-continued-construct indent-point
9486 ;; CASE 14: A case or default label
9487 ((looking-at c-label-kwds-regexp
)
9490 (goto-char containing-sexp
)
9491 (setq lim
(c-most-enclosing-brace c-state-cache
9493 (c-backward-to-block-anchor lim
)
9494 (c-add-stmt-syntax 'case-label nil t lim paren-state
))
9495 ;; Got a bogus label at the top level. In lack of better
9496 ;; alternatives, anchor it on (point-min).
9497 (c-add-syntax 'case-label
(point-min))))
9499 ;; CASE 15: any other label
9501 (back-to-indentation)
9502 (and (not (looking-at c-syntactic-ws-start
))
9504 (cond (containing-decl-open
9505 (setq placeholder
(c-add-class-syntax 'inclass
9506 containing-decl-open
9507 containing-decl-start
9510 ;; Append access-label with the same anchor point as
9512 (c-append-syntax 'access-label placeholder
))
9515 (goto-char containing-sexp
)
9516 (setq lim
(c-most-enclosing-brace c-state-cache
9520 (if (and (eq (c-beginning-of-statement-1 lim
) 'up
)
9521 (looking-at "switch\\>[^_]"))
9522 ;; If the surrounding statement is a switch then
9523 ;; let's analyze all labels as switch labels, so
9524 ;; that they get lined up consistently.
9527 (c-backward-to-block-anchor lim
)
9528 (c-add-stmt-syntax tmpsymbol nil t lim paren-state
))
9531 ;; A label on the top level. Treat it as a class
9532 ;; context. (point-min) is the closest we get to the
9533 ;; class open brace.
9534 (c-add-syntax 'access-label
(point-min)))))
9536 ;; CASE 4: In-expression statement. C.f. cases 7B, 16A and
9538 ((setq placeholder
(c-looking-at-inexpr-block
9539 (c-safe-position containing-sexp paren-state
)
9541 ;; Have to turn on the heuristics after
9542 ;; the point even though it doesn't work
9543 ;; very well. C.f. test case class-16.pike.
9545 (setq tmpsymbol
(assq (car placeholder
)
9546 '((inexpr-class . class-open
)
9547 (inexpr-statement . block-open
))))
9549 ;; It's a statement block or an anonymous class.
9550 (setq tmpsymbol
(cdr tmpsymbol
))
9551 ;; It's a Pike lambda. Check whether we are between the
9552 ;; lambda keyword and the argument list or at the defun
9554 (setq tmpsymbol
(if (eq char-after-ip ?
{)
9556 'lambda-intro-cont
)))
9557 (goto-char (cdr placeholder
))
9558 (back-to-indentation)
9559 (c-add-stmt-syntax tmpsymbol nil t
9560 (c-most-enclosing-brace c-state-cache
(point))
9562 (unless (eq (point) (cdr placeholder
))
9563 (c-add-syntax (car placeholder
))))
9565 ;; CASE 5: Line is inside a declaration level block or at top level.
9566 ((or containing-decl-open
(null containing-sexp
))
9569 ;; CASE 5A: we are looking at a defun, brace list, class,
9570 ;; or inline-inclass method opening brace
9571 ((setq special-brace-list
9572 (or (and c-special-brace-lists
9573 (c-looking-at-special-brace-list))
9574 (eq char-after-ip ?
{)))
9577 ;; CASE 5A.1: Non-class declaration block open.
9580 (and (eq char-after-ip ?
{)
9581 (setq tmp
(c-looking-at-decl-block containing-sexp t
))
9583 (setq placeholder
(point))
9585 (looking-at c-symbol-key
))
9587 (c-keyword-sym (setq keyword
(match-string 0)))
9588 'c-other-block-decl-kwds
))))
9589 (goto-char placeholder
)
9591 (if (string-equal keyword
"extern")
9592 ;; Special case for extern-lang-open.
9594 (intern (concat keyword
"-open")))
9595 nil t containing-sexp paren-state
))
9597 ;; CASE 5A.2: we are looking at a class opening brace
9599 (goto-char indent-point
)
9600 (skip-chars-forward " \t")
9601 (and (eq (char-after) ?
{)
9602 (c-looking-at-decl-block containing-sexp t
)
9603 (setq placeholder
(point))))
9604 (c-add-syntax 'class-open placeholder
))
9606 ;; CASE 5A.3: brace list open
9608 (c-beginning-of-decl-1 lim
)
9609 (while (looking-at c-specifier-key
)
9610 (goto-char (match-end 1))
9611 (c-forward-syntactic-ws indent-point
))
9612 (setq placeholder
(c-point 'boi
))
9613 (or (consp special-brace-list
)
9614 (and (or (save-excursion
9615 (goto-char indent-point
)
9616 (setq tmpsymbol nil
)
9617 (while (and (> (point) placeholder
)
9618 (zerop (c-backward-token-2 1 t
))
9619 (not (looking-at "=\\([^=]\\|$\\)")))
9620 (and c-opt-inexpr-brace-list-key
9622 (looking-at c-opt-inexpr-brace-list-key
)
9623 (setq tmpsymbol
'topmost-intro-cont
)))
9624 (looking-at "=\\([^=]\\|$\\)"))
9625 (looking-at c-brace-list-key
))
9627 (while (and (< (point) indent-point
)
9628 (zerop (c-forward-token-2 1 t
))
9629 (not (memq (char-after) '(?\
; ?\()))))
9630 (not (memq (char-after) '(?\
; ?\()))
9632 (if (and (not c-auto-newline-analysis
)
9633 (c-major-mode-is 'java-mode
)
9634 (eq tmpsymbol
'topmost-intro-cont
))
9635 ;; We're in Java and have found that the open brace
9636 ;; belongs to a "new Foo[]" initialization list,
9637 ;; which means the brace list is part of an
9638 ;; expression and not a top level definition. We
9639 ;; therefore treat it as any topmost continuation
9640 ;; even though the semantically correct symbol still
9641 ;; is brace-list-open, on the same grounds as in
9644 (c-beginning-of-statement-1 lim
)
9645 (c-add-syntax 'topmost-intro-cont
(c-point 'boi
)))
9646 (c-add-syntax 'brace-list-open placeholder
)))
9648 ;; CASE 5A.4: inline defun open
9649 ((and containing-decl-open
9650 (not (c-keyword-member containing-decl-kwd
9651 'c-other-block-decl-kwds
)))
9652 (c-add-syntax 'inline-open
)
9653 (c-add-class-syntax 'inclass
9654 containing-decl-open
9655 containing-decl-start
9659 ;; CASE 5A.5: ordinary defun open
9662 (c-beginning-of-decl-1 lim
)
9663 (while (looking-at c-specifier-key
)
9664 (goto-char (match-end 1))
9665 (c-forward-syntactic-ws indent-point
))
9666 (c-add-syntax 'defun-open
(c-point 'boi
))
9667 ;; Bogus to use bol here, but it's the legacy. (Resolved,
9671 ;; CASE 5B: After a function header but before the body (or
9672 ;; the ending semicolon if there's no body).
9674 (when (setq placeholder
(c-just-after-func-arglist-p
9675 (max lim
(c-determine-limit 500))))
9676 (setq tmp-pos
(point))))
9679 ;; CASE 5B.1: Member init list.
9680 ((eq (char-after tmp-pos
) ?
:)
9681 (if (or (>= tmp-pos indent-point
)
9682 (= (c-point 'bosws
) (1+ tmp-pos
)))
9684 ;; There is no preceding member init clause.
9685 ;; Indent relative to the beginning of indentation
9686 ;; for the topmost-intro line that contains the
9687 ;; prototype's open paren.
9688 (goto-char placeholder
)
9689 (c-add-syntax 'member-init-intro
(c-point 'boi
)))
9690 ;; Indent relative to the first member init clause.
9691 (goto-char (1+ tmp-pos
))
9692 (c-forward-syntactic-ws)
9693 (c-add-syntax 'member-init-cont
(point))))
9695 ;; CASE 5B.2: K&R arg decl intro
9696 ((and c-recognize-knr-p
9697 (c-in-knr-argdecl lim
))
9698 (c-beginning-of-statement-1 lim
)
9699 (c-add-syntax 'knr-argdecl-intro
(c-point 'boi
))
9700 (if containing-decl-open
9701 (c-add-class-syntax 'inclass
9702 containing-decl-open
9703 containing-decl-start
9707 ;; CASE 5B.4: Nether region after a C++ or Java func
9708 ;; decl, which could include a `throws' declaration.
9710 (c-beginning-of-statement-1 lim
)
9711 (c-add-syntax 'func-decl-cont
(c-point 'boi
))
9714 ;; CASE 5C: inheritance line. could be first inheritance
9715 ;; line, or continuation of a multiple inheritance
9716 ((or (and (c-major-mode-is 'c
++-mode
)
9718 (when (eq char-after-ip ?
,)
9719 (skip-chars-forward " \t")
9721 (looking-at c-opt-postfix-decl-spec-key
)))
9722 (and (or (eq char-before-ip ?
:)
9723 ;; watch out for scope operator
9725 (and (eq char-after-ip ?
:)
9726 (c-safe (forward-char 1) t
)
9727 (not (eq (char-after) ?
:))
9730 (c-backward-syntactic-ws lim
)
9731 (if (eq char-before-ip ?
:)
9734 (c-backward-syntactic-ws lim
)))
9735 (back-to-indentation)
9736 (looking-at c-class-key
)))
9738 (and (c-major-mode-is 'java-mode
)
9739 (let ((fence (save-excursion
9740 (c-beginning-of-statement-1 lim
)
9745 (cond ((looking-at c-opt-postfix-decl-spec-key
)
9746 (setq injava-inher
(cons cont
(point))
9748 ((or (not (c-safe (c-forward-sexp -
1) t
))
9754 (not (c-crosses-statement-barrier-p (cdr injava-inher
)
9759 ;; CASE 5C.1: non-hanging colon on an inher intro
9760 ((eq char-after-ip ?
:)
9761 (c-beginning-of-statement-1 lim
)
9762 (c-add-syntax 'inher-intro
(c-point 'boi
))
9763 ;; don't add inclass symbol since relative point already
9764 ;; contains any class offset
9767 ;; CASE 5C.2: hanging colon on an inher intro
9768 ((eq char-before-ip ?
:)
9769 (c-beginning-of-statement-1 lim
)
9770 (c-add-syntax 'inher-intro
(c-point 'boi
))
9771 (if containing-decl-open
9772 (c-add-class-syntax 'inclass
9773 containing-decl-open
9774 containing-decl-start
9778 ;; CASE 5C.3: in a Java implements/extends
9780 (let ((where (cdr injava-inher
))
9781 (cont (car injava-inher
)))
9783 (cond ((looking-at "throws\\>[^_]")
9784 (c-add-syntax 'func-decl-cont
9785 (progn (c-beginning-of-statement-1 lim
)
9787 (cont (c-add-syntax 'inher-cont where
))
9788 (t (c-add-syntax 'inher-intro
9789 (progn (goto-char (cdr injava-inher
))
9790 (c-beginning-of-statement-1 lim
)
9794 ;; CASE 5C.4: a continued inheritance line
9796 (c-beginning-of-inheritance-list lim
)
9797 (c-add-syntax 'inher-cont
(point))
9798 ;; don't add inclass symbol since relative point already
9799 ;; contains any class offset
9802 ;; CASE 5P: AWK pattern or function or continuation
9804 ((c-major-mode-is 'awk-mode
)
9805 (setq placeholder
(point))
9807 (if (and (eq (c-beginning-of-statement-1) 'same
)
9808 (/= (point) placeholder
))
9812 containing-sexp paren-state
))
9814 ;; CASE 5D: this could be a top-level initialization, a
9815 ;; member init list continuation, or a template argument
9816 ;; list continuation.
9818 ;; Note: We use the fact that lim is always after any
9819 ;; preceding brace sexp.
9820 (if c-recognize-
<>-arglists
9823 (c-syntactic-skip-backward "^;,=<>" lim t
)
9826 (when c-overloadable-operators-regexp
9827 (when (setq placeholder
(c-after-special-operator-id lim
))
9828 (goto-char placeholder
)
9831 ((eq (char-before) ?
>)
9832 (or (c-backward-<>-arglist nil lim
)
9835 ((eq (char-before) ?
<)
9838 (c-forward-<>-arglist nil
))
9839 (progn (forward-char)
9843 ;; NB: No c-after-special-operator-id stuff in this
9844 ;; clause - we assume only C++ needs it.
9845 (c-syntactic-skip-backward "^;,=" lim t
))
9846 (memq (char-before) '(?
, ?
= ?
<)))
9849 ;; CASE 5D.3: perhaps a template list continuation?
9850 ((and (c-major-mode-is 'c
++-mode
)
9853 (c-with-syntax-table c
++-template-syntax-table
9854 (goto-char indent-point
)
9855 (setq placeholder
(c-up-list-backward))
9857 (eq (char-after placeholder
) ?
<))))))
9858 (c-with-syntax-table c
++-template-syntax-table
9859 (goto-char placeholder
)
9860 (c-beginning-of-statement-1 lim t
)
9862 (c-backward-syntactic-ws lim
)
9863 (eq (char-before) ?
<))
9864 ;; In a nested template arglist.
9866 (goto-char placeholder
)
9867 (c-syntactic-skip-backward "^,;" lim t
)
9868 (c-forward-syntactic-ws))
9869 (back-to-indentation)))
9870 ;; FIXME: Should use c-add-stmt-syntax, but it's not yet
9872 (c-add-syntax 'template-args-cont
(point) placeholder
))
9874 ;; CASE 5D.4: perhaps a multiple inheritance line?
9875 ((and (c-major-mode-is 'c
++-mode
)
9877 (c-beginning-of-statement-1 lim
)
9878 (setq placeholder
(point))
9879 (if (looking-at "static\\>[^_]")
9880 (c-forward-token-2 1 nil indent-point
))
9881 (and (looking-at c-class-key
)
9882 (zerop (c-forward-token-2 2 nil indent-point
))
9883 (if (eq (char-after) ?
<)
9884 (c-with-syntax-table c
++-template-syntax-table
9885 (zerop (c-forward-token-2 1 t indent-point
)))
9887 (eq (char-after) ?
:))))
9888 (goto-char placeholder
)
9889 (c-add-syntax 'inher-cont
(c-point 'boi
)))
9891 ;; CASE 5D.5: Continuation of the "expression part" of a
9892 ;; top level construct. Or, perhaps, an unrecognized construct.
9894 (while (and (setq placeholder
(point))
9895 (eq (car (c-beginning-of-decl-1 containing-sexp
)) ; Can't use `lim' here.
9898 (c-backward-syntactic-ws)
9899 (eq (char-before) ?
}))
9900 (< (point) placeholder
)))
9903 ((eq (point) placeholder
) 'statement
) ; unrecognized construct
9904 ;; A preceding comma at the top level means that a
9905 ;; new variable declaration starts here. Use
9906 ;; topmost-intro-cont for it, for consistency with
9907 ;; the first variable declaration. C.f. case 5N.
9908 ((eq char-before-ip ?
,) 'topmost-intro-cont
)
9909 (t 'statement-cont
))
9910 nil nil containing-sexp paren-state
))
9913 ;; CASE 5F: Close of a non-class declaration level block.
9914 ((and (eq char-after-ip ?
})
9915 (c-keyword-member containing-decl-kwd
9916 'c-other-block-decl-kwds
))
9917 ;; This is inconsistent: Should use `containing-decl-open'
9918 ;; here if it's at boi, like in case 5J.
9919 (goto-char containing-decl-start
)
9921 (if (string-equal (symbol-name containing-decl-kwd
) "extern")
9922 ;; Special case for compatibility with the
9923 ;; extern-lang syntactic symbols.
9925 (intern (concat (symbol-name containing-decl-kwd
)
9928 (c-most-enclosing-brace paren-state
(point))
9931 ;; CASE 5G: we are looking at the brace which closes the
9932 ;; enclosing nested class decl
9933 ((and containing-sexp
9934 (eq char-after-ip ?
})
9935 (eq containing-decl-open containing-sexp
))
9936 (c-add-class-syntax 'class-close
9937 containing-decl-open
9938 containing-decl-start
9942 ;; CASE 5H: we could be looking at subsequent knr-argdecls
9943 ((and c-recognize-knr-p
9944 (not containing-sexp
) ; can't be knr inside braces.
9945 (not (eq char-before-ip ?
}))
9947 (setq placeholder
(cdr (c-beginning-of-decl-1 lim
)))
9949 ;; Do an extra check to avoid tripping up on
9950 ;; statements that occur in invalid contexts
9951 ;; (e.g. in macro bodies where we don't really
9952 ;; know the context of what we're looking at).
9953 (not (and c-opt-block-stmt-key
9954 (looking-at c-opt-block-stmt-key
)))))
9955 (< placeholder indent-point
))
9956 (goto-char placeholder
)
9957 (c-add-syntax 'knr-argdecl
(point)))
9959 ;; CASE 5I: ObjC method definition.
9960 ((and c-opt-method-key
9961 (looking-at c-opt-method-key
))
9962 (c-beginning-of-statement-1 nil t
)
9963 (if (= (point) indent-point
)
9964 ;; Handle the case when it's the first (non-comment)
9965 ;; thing in the buffer. Can't look for a 'same return
9966 ;; value from cbos1 since ObjC directives currently
9967 ;; aren't recognized fully, so that we get 'same
9968 ;; instead of 'previous if it moved over a preceding
9970 (goto-char (point-min)))
9971 (c-add-syntax 'objc-method-intro
(c-point 'boi
)))
9973 ;; CASE 5N: At a variable declaration that follows a class
9974 ;; definition or some other block declaration that doesn't
9975 ;; end at the closing '}'. C.f. case 5D.5.
9977 (c-backward-syntactic-ws lim
)
9978 (and (eq (char-before) ?
})
9980 (let ((start (point)))
9981 (if (and c-state-cache
9982 (consp (car c-state-cache
))
9983 (eq (cdar c-state-cache
) (point)))
9984 ;; Speed up the backward search a bit.
9985 (goto-char (caar c-state-cache
)))
9986 (c-beginning-of-decl-1 containing-sexp
) ; Can't use `lim' here.
9987 (setq placeholder
(point))
9988 (if (= start
(point))
9989 ;; The '}' is unbalanced.
9992 (>= (point) indent-point
))))))
9993 (goto-char placeholder
)
9994 (c-add-stmt-syntax 'topmost-intro-cont nil nil
9995 containing-sexp paren-state
))
9997 ;; NOTE: The point is at the end of the previous token here.
9999 ;; CASE 5J: we are at the topmost level, make
10000 ;; sure we skip back past any access specifiers
10002 ;; A macro continuation line is never at top level.
10003 (not (and macro-start
10004 (> indent-point macro-start
)))
10006 (setq placeholder
(point))
10007 (or (memq char-before-ip
'(?\
; ?{ ?} nil))
10008 (c-at-vsemi-p before-ws-ip
)
10009 (when (and (eq char-before-ip ?
:)
10010 (eq (c-beginning-of-statement-1 lim
)
10012 (c-backward-syntactic-ws lim
)
10013 (setq placeholder
(point)))
10014 (and (c-major-mode-is 'objc-mode
)
10015 (catch 'not-in-directive
10016 (c-beginning-of-statement-1 lim
)
10017 (setq placeholder
(point))
10018 (while (and (c-forward-objc-directive)
10019 (< (point) indent-point
))
10020 (c-forward-syntactic-ws)
10021 (if (>= (point) indent-point
)
10022 (throw 'not-in-directive t
))
10023 (setq placeholder
(point)))
10025 ;; For historic reasons we anchor at bol of the last
10026 ;; line of the previous declaration. That's clearly
10027 ;; highly bogus and useless, and it makes our lives hard
10028 ;; to remain compatible. :P
10029 (goto-char placeholder
)
10030 (c-add-syntax 'topmost-intro
(c-point 'bol
))
10031 (if containing-decl-open
10032 (if (c-keyword-member containing-decl-kwd
10033 'c-other-block-decl-kwds
)
10035 (goto-char (c-brace-anchor-point containing-decl-open
))
10037 (if (string-equal (symbol-name containing-decl-kwd
)
10039 ;; Special case for compatibility with the
10040 ;; extern-lang syntactic symbols.
10042 (intern (concat "in"
10043 (symbol-name containing-decl-kwd
))))
10045 (c-most-enclosing-brace paren-state
(point))
10047 (c-add-class-syntax 'inclass
10048 containing-decl-open
10049 containing-decl-start
10050 containing-decl-kwd
10052 (when (and c-syntactic-indentation-in-macros
10054 (/= macro-start
(c-point 'boi indent-point
)))
10055 (c-add-syntax 'cpp-define-intro
)
10056 (setq macro-start nil
)))
10058 ;; CASE 5K: we are at an ObjC method definition
10059 ;; continuation line.
10060 ((and c-opt-method-key
10062 (c-beginning-of-statement-1 lim
)
10063 (beginning-of-line)
10064 (when (looking-at c-opt-method-key
)
10065 (setq placeholder
(point)))))
10066 (c-add-syntax 'objc-method-args-cont placeholder
))
10068 ;; CASE 5L: we are at the first argument of a template
10069 ;; arglist that begins on the previous line.
10070 ((and c-recognize-
<>-arglists
10071 (eq (char-before) ?
<)
10072 (not (and c-overloadable-operators-regexp
10073 (c-after-special-operator-id lim
))))
10074 (c-beginning-of-statement-1 (c-safe-position (point) paren-state
))
10075 (c-add-syntax 'template-args-cont
(c-point 'boi
)))
10077 ;; CASE 5Q: we are at a statement within a macro.
10079 (c-beginning-of-statement-1 containing-sexp
)
10080 (c-add-stmt-syntax 'statement nil t containing-sexp paren-state
))
10082 ;;CASE 5N: We are at a topmost continuation line and the only
10083 ;;preceding items are annotations.
10084 ((and (c-major-mode-is 'java-mode
)
10085 (setq placeholder
(point))
10086 (c-beginning-of-statement-1)
10088 (while (and (c-forward-annotation))
10089 (c-forward-syntactic-ws))
10092 (>= (point) placeholder
)
10093 (goto-char placeholder
)))
10094 (c-add-syntax 'annotation-top-cont
(c-point 'boi
)))
10096 ;; CASE 5M: we are at a topmost continuation line
10098 (c-beginning-of-statement-1 (c-safe-position (point) paren-state
))
10099 (when (c-major-mode-is 'objc-mode
)
10100 (setq placeholder
(point))
10101 (while (and (c-forward-objc-directive)
10102 (< (point) indent-point
))
10103 (c-forward-syntactic-ws)
10104 (setq placeholder
(point)))
10105 (goto-char placeholder
))
10106 (c-add-syntax 'topmost-intro-cont
(c-point 'boi
)))
10110 ;; (CASE 6 has been removed.)
10112 ;; CASE 7: line is an expression, not a statement. Most
10113 ;; likely we are either in a function prototype or a function
10114 ;; call argument list
10115 ((not (or (and c-special-brace-lists
10117 (goto-char containing-sexp
)
10118 (c-looking-at-special-brace-list)))
10119 (eq (char-after containing-sexp
) ?
{)))
10122 ;; CASE 7A: we are looking at the arglist closing paren.
10124 ((memq char-after-ip
'(?\
) ?\
]))
10125 (goto-char containing-sexp
)
10126 (setq placeholder
(c-point 'boi
))
10127 (if (and (c-safe (backward-up-list 1) t
)
10128 (>= (point) placeholder
))
10131 (skip-chars-forward " \t"))
10132 (goto-char placeholder
))
10133 (c-add-stmt-syntax 'arglist-close
(list containing-sexp
) t
10134 (c-most-enclosing-brace paren-state
(point))
10137 ;; CASE 7B: Looking at the opening brace of an
10138 ;; in-expression block or brace list. C.f. cases 4, 16A
10140 ((and (eq char-after-ip ?
{)
10142 (setq placeholder
(c-inside-bracelist-p (point)
10145 (setq tmpsymbol
'(brace-list-open . inexpr-class
))
10146 (setq tmpsymbol
'(block-open . inexpr-statement
)
10148 (cdr-safe (c-looking-at-inexpr-block
10149 (c-safe-position containing-sexp
10152 ;; placeholder is nil if it's a block directly in
10153 ;; a function arglist. That makes us skip out of
10156 (goto-char placeholder
)
10157 (back-to-indentation)
10158 (c-add-stmt-syntax (car tmpsymbol
) nil t
10159 (c-most-enclosing-brace paren-state
(point))
10161 (if (/= (point) placeholder
)
10162 (c-add-syntax (cdr tmpsymbol
))))
10164 ;; CASE 7C: we are looking at the first argument in an empty
10165 ;; argument list. Use arglist-close if we're actually
10166 ;; looking at a close paren or bracket.
10167 ((memq char-before-ip
'(?\
( ?\
[))
10168 (goto-char containing-sexp
)
10169 (setq placeholder
(c-point 'boi
))
10170 (if (and (c-safe (backward-up-list 1) t
)
10171 (>= (point) placeholder
))
10174 (skip-chars-forward " \t"))
10175 (goto-char placeholder
))
10176 (c-add-stmt-syntax 'arglist-intro
(list containing-sexp
) t
10177 (c-most-enclosing-brace paren-state
(point))
10180 ;; CASE 7D: we are inside a conditional test clause. treat
10181 ;; these things as statements
10183 (goto-char containing-sexp
)
10184 (and (c-safe (c-forward-sexp -
1) t
)
10185 (looking-at "\\<for\\>[^_]")))
10186 (goto-char (1+ containing-sexp
))
10187 (c-forward-syntactic-ws indent-point
)
10188 (if (eq char-before-ip ?\
;)
10189 (c-add-syntax 'statement
(point))
10190 (c-add-syntax 'statement-cont
(point))
10193 ;; CASE 7E: maybe a continued ObjC method call. This is the
10194 ;; case when we are inside a [] bracketed exp, and what
10195 ;; precede the opening bracket is not an identifier.
10196 ((and c-opt-method-key
10197 (eq (char-after containing-sexp
) ?\
[)
10199 (goto-char (1- containing-sexp
))
10200 (c-backward-syntactic-ws (c-point 'bod
))
10201 (if (not (looking-at c-symbol-key
))
10202 (c-add-syntax 'objc-method-call-cont containing-sexp
))
10205 ;; CASE 7F: we are looking at an arglist continuation line,
10206 ;; but the preceding argument is on the same line as the
10207 ;; opening paren. This case includes multi-line
10208 ;; mathematical paren groupings, but we could be on a
10209 ;; for-list continuation line. C.f. case 7A.
10211 (goto-char (1+ containing-sexp
))
10213 (c-forward-syntactic-ws)
10216 (goto-char containing-sexp
) ; paren opening the arglist
10217 (setq placeholder
(c-point 'boi
))
10218 (if (and (c-safe (backward-up-list 1) t
)
10219 (>= (point) placeholder
))
10222 (skip-chars-forward " \t"))
10223 (goto-char placeholder
))
10224 (c-add-stmt-syntax 'arglist-cont-nonempty
(list containing-sexp
) t
10225 (c-most-enclosing-brace c-state-cache
(point))
10228 ;; CASE 7G: we are looking at just a normal arglist
10229 ;; continuation line
10230 (t (c-forward-syntactic-ws indent-point
)
10231 (c-add-syntax 'arglist-cont
(c-point 'boi
)))
10234 ;; CASE 8: func-local multi-inheritance line
10235 ((and (c-major-mode-is 'c
++-mode
)
10237 (goto-char indent-point
)
10238 (skip-chars-forward " \t")
10239 (looking-at c-opt-postfix-decl-spec-key
)))
10240 (goto-char indent-point
)
10241 (skip-chars-forward " \t")
10244 ;; CASE 8A: non-hanging colon on an inher intro
10245 ((eq char-after-ip ?
:)
10246 (c-backward-syntactic-ws lim
)
10247 (c-add-syntax 'inher-intro
(c-point 'boi
)))
10249 ;; CASE 8B: hanging colon on an inher intro
10250 ((eq char-before-ip ?
:)
10251 (c-add-syntax 'inher-intro
(c-point 'boi
)))
10253 ;; CASE 8C: a continued inheritance line
10255 (c-beginning-of-inheritance-list lim
)
10256 (c-add-syntax 'inher-cont
(point))
10259 ;; CASE 9: we are inside a brace-list
10260 ((and (not (c-major-mode-is 'awk-mode
)) ; Maybe this isn't needed (ACM, 2002/3/29)
10261 (setq special-brace-list
10262 (or (and c-special-brace-lists
;;;; ALWAYS NIL FOR AWK!!
10264 (goto-char containing-sexp
)
10265 (c-looking-at-special-brace-list)))
10266 (c-inside-bracelist-p containing-sexp paren-state
))))
10269 ;; CASE 9A: In the middle of a special brace list opener.
10270 ((and (consp special-brace-list
)
10272 (goto-char containing-sexp
)
10273 (eq (char-after) ?\
())
10274 (eq char-after-ip
(car (cdr special-brace-list
))))
10275 (goto-char (car (car special-brace-list
)))
10276 (skip-chars-backward " \t")
10278 (assoc 'statement-cont
10279 (setq placeholder
(c-guess-basic-syntax))))
10280 (setq c-syntactic-context placeholder
)
10281 (c-beginning-of-statement-1
10282 (c-safe-position (1- containing-sexp
) paren-state
))
10283 (c-forward-token-2 0)
10284 (while (looking-at c-specifier-key
)
10285 (goto-char (match-end 1))
10286 (c-forward-syntactic-ws))
10287 (c-add-syntax 'brace-list-open
(c-point 'boi
))))
10289 ;; CASE 9B: brace-list-close brace
10290 ((if (consp special-brace-list
)
10291 ;; Check special brace list closer.
10293 (goto-char (car (car special-brace-list
)))
10295 (goto-char indent-point
)
10296 (back-to-indentation)
10298 ;; We were between the special close char and the `)'.
10299 (and (eq (char-after) ?\
))
10300 (eq (1+ (point)) (cdr (car special-brace-list
))))
10301 ;; We were before the special close char.
10302 (and (eq (char-after) (cdr (cdr special-brace-list
)))
10303 (zerop (c-forward-token-2))
10304 (eq (1+ (point)) (cdr (car special-brace-list
)))))))
10305 ;; Normal brace list check.
10306 (and (eq char-after-ip ?
})
10307 (c-safe (goto-char (c-up-list-backward (point))) t
)
10308 (= (point) containing-sexp
)))
10309 (if (eq (point) (c-point 'boi
))
10310 (c-add-syntax 'brace-list-close
(point))
10311 (setq lim
(c-most-enclosing-brace c-state-cache
(point)))
10312 (c-beginning-of-statement-1 lim
)
10313 (c-add-stmt-syntax 'brace-list-close nil t lim paren-state
)))
10316 ;; Prepare for the rest of the cases below by going to the
10317 ;; token following the opening brace
10318 (if (consp special-brace-list
)
10320 (goto-char (car (car special-brace-list
)))
10321 (c-forward-token-2 1 nil indent-point
))
10322 (goto-char containing-sexp
))
10324 (let ((start (point)))
10325 (c-forward-syntactic-ws indent-point
)
10326 (goto-char (max start
(c-point 'bol
))))
10327 (c-skip-ws-forward indent-point
)
10330 ;; CASE 9C: we're looking at the first line in a brace-list
10331 ((= (point) indent-point
)
10332 (if (consp special-brace-list
)
10333 (goto-char (car (car special-brace-list
)))
10334 (goto-char containing-sexp
))
10335 (if (eq (point) (c-point 'boi
))
10336 (c-add-syntax 'brace-list-intro
(point))
10337 (setq lim
(c-most-enclosing-brace c-state-cache
(point)))
10338 (c-beginning-of-statement-1 lim
)
10339 (c-add-stmt-syntax 'brace-list-intro nil t lim paren-state
)))
10341 ;; CASE 9D: this is just a later brace-list-entry or
10342 ;; brace-entry-open
10343 (t (if (or (eq char-after-ip ?
{)
10344 (and c-special-brace-lists
10346 (goto-char indent-point
)
10347 (c-forward-syntactic-ws (c-point 'eol
))
10348 (c-looking-at-special-brace-list (point)))))
10349 (c-add-syntax 'brace-entry-open
(point))
10350 (c-add-syntax 'brace-list-entry
(point))
10354 ;; CASE 10: A continued statement or top level construct.
10355 ((and (not (memq char-before-ip
'(?\
; ?:)))
10356 (not (c-at-vsemi-p before-ws-ip
))
10357 (or (not (eq char-before-ip ?
}))
10358 (c-looking-at-inexpr-block-backward c-state-cache
))
10361 (c-beginning-of-statement-1 containing-sexp
)
10362 (setq placeholder
(point))))
10363 (/= placeholder containing-sexp
))
10364 ;; This is shared with case 18.
10365 (c-guess-continued-construct indent-point
10371 ;; CASE 16: block close brace, possibly closing the defun or
10373 ((eq char-after-ip ?
})
10374 ;; From here on we have the next containing sexp in lim.
10375 (setq lim
(c-most-enclosing-brace paren-state
))
10376 (goto-char containing-sexp
)
10379 ;; CASE 16E: Closing a statement block? This catches
10380 ;; cases where it's preceded by a statement keyword,
10381 ;; which works even when used in an "invalid" context,
10382 ;; e.g. a macro argument.
10383 ((c-after-conditional)
10384 (c-backward-to-block-anchor lim
)
10385 (c-add-stmt-syntax 'block-close nil t lim paren-state
))
10387 ;; CASE 16A: closing a lambda defun or an in-expression
10388 ;; block? C.f. cases 4, 7B and 17E.
10389 ((setq placeholder
(c-looking-at-inexpr-block
10390 (c-safe-position containing-sexp paren-state
)
10392 (setq tmpsymbol
(if (eq (car placeholder
) 'inlambda
)
10395 (goto-char containing-sexp
)
10396 (back-to-indentation)
10397 (if (= containing-sexp
(point))
10398 (c-add-syntax tmpsymbol
(point))
10399 (goto-char (cdr placeholder
))
10400 (back-to-indentation)
10401 (c-add-stmt-syntax tmpsymbol nil t
10402 (c-most-enclosing-brace paren-state
(point))
10404 (if (/= (point) (cdr placeholder
))
10405 (c-add-syntax (car placeholder
)))))
10407 ;; CASE 16B: does this close an inline or a function in
10408 ;; a non-class declaration level block?
10413 (c-looking-at-decl-block
10414 (c-most-enclosing-brace paren-state lim
)
10416 (setq placeholder
(point))))
10417 (c-backward-to-decl-anchor lim
)
10418 (back-to-indentation)
10419 (if (save-excursion
10420 (goto-char placeholder
)
10421 (looking-at c-other-decl-block-key
))
10422 (c-add-syntax 'defun-close
(point))
10423 (c-add-syntax 'inline-close
(point))))
10425 ;; CASE 16F: Can be a defun-close of a function declared
10426 ;; in a statement block, e.g. in Pike or when using gcc
10427 ;; extensions, but watch out for macros followed by
10428 ;; blocks. Let it through to be handled below.
10429 ;; C.f. cases B.3 and 17G.
10431 (and (not (c-at-statement-start-p))
10432 (eq (c-beginning-of-statement-1 lim nil nil t
) 'same
)
10433 (setq placeholder
(point))
10434 (let ((c-recognize-typeless-decls nil
))
10435 ;; Turn off recognition of constructs that
10436 ;; lacks a type in this case, since that's more
10437 ;; likely to be a macro followed by a block.
10438 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
10439 (back-to-indentation)
10440 (if (/= (point) containing-sexp
)
10441 (goto-char placeholder
))
10442 (c-add-stmt-syntax 'defun-close nil t lim paren-state
))
10444 ;; CASE 16C: If there is an enclosing brace then this is
10445 ;; a block close since defun closes inside declaration
10446 ;; level blocks have been handled above.
10448 ;; If the block is preceded by a case/switch label on
10449 ;; the same line, we anchor at the first preceding label
10450 ;; at boi. The default handling in c-add-stmt-syntax
10451 ;; really fixes it better, but we do like this to keep
10452 ;; the indentation compatible with version 5.28 and
10453 ;; earlier. C.f. case 17H.
10454 (while (and (/= (setq placeholder
(point)) (c-point 'boi
))
10455 (eq (c-beginning-of-statement-1 lim
) 'label
)))
10456 (goto-char placeholder
)
10457 (if (looking-at c-label-kwds-regexp
)
10458 (c-add-syntax 'block-close
(point))
10459 (goto-char containing-sexp
)
10460 ;; c-backward-to-block-anchor not necessary here; those
10461 ;; situations are handled in case 16E above.
10462 (c-add-stmt-syntax 'block-close nil t lim paren-state
)))
10464 ;; CASE 16D: Only top level defun close left.
10466 (goto-char containing-sexp
)
10467 (c-backward-to-decl-anchor lim
)
10468 (c-add-stmt-syntax 'defun-close nil nil
10469 (c-most-enclosing-brace paren-state
)
10473 ;; CASE 19: line is an expression, not a statement, and is directly
10474 ;; contained by a template delimiter. Most likely, we are in a
10475 ;; template arglist within a statement. This case is based on CASE
10476 ;; 7. At some point in the future, we may wish to create more
10477 ;; syntactic symbols such as `template-intro',
10478 ;; `template-cont-nonempty', etc., and distinguish between them as we
10479 ;; do for `arglist-intro' etc. (2009-12-07).
10480 ((and c-recognize-
<>-arglists
10481 (setq containing-
< (c-up-list-backward indent-point containing-sexp
))
10482 (eq (char-after containing-
<) ?\
<))
10483 (setq placeholder
(c-point 'boi containing-
<))
10484 (goto-char containing-sexp
) ; Most nested Lbrace/Lparen (but not
10485 ; '<') before indent-point.
10486 (if (>= (point) placeholder
)
10489 (skip-chars-forward " \t"))
10490 (goto-char placeholder
))
10491 (c-add-stmt-syntax 'template-args-cont
(list containing-
<) t
10492 (c-most-enclosing-brace c-state-cache
(point))
10495 ;; CASE 17: Statement or defun catchall.
10497 (goto-char indent-point
)
10498 ;; Back up statements until we find one that starts at boi.
10499 (while (let* ((prev-point (point))
10500 (last-step-type (c-beginning-of-statement-1
10502 (if (= (point) prev-point
)
10504 (setq step-type
(or step-type last-step-type
))
10506 (setq step-type last-step-type
)
10507 (/= (point) (c-point 'boi
)))))
10510 ;; CASE 17B: continued statement
10511 ((and (eq step-type
'same
)
10512 (/= (point) indent-point
))
10513 (c-add-stmt-syntax 'statement-cont nil nil
10514 containing-sexp paren-state
))
10516 ;; CASE 17A: After a case/default label?
10518 (while (and (eq step-type
'label
)
10519 (not (looking-at c-label-kwds-regexp
)))
10521 (c-beginning-of-statement-1 containing-sexp
)))
10522 (eq step-type
'label
))
10523 (c-add-stmt-syntax (if (eq char-after-ip ?
{)
10524 'statement-case-open
10525 'statement-case-intro
)
10526 nil t containing-sexp paren-state
))
10528 ;; CASE 17D: any old statement
10530 (while (eq step-type
'label
)
10532 (c-beginning-of-statement-1 containing-sexp
)))
10533 (eq step-type
'previous
))
10534 (c-add-stmt-syntax 'statement nil t
10535 containing-sexp paren-state
)
10536 (if (eq char-after-ip ?
{)
10537 (c-add-syntax 'block-open
)))
10539 ;; CASE 17I: Inside a substatement block.
10541 ;; The following tests are all based on containing-sexp.
10542 (goto-char containing-sexp
)
10543 ;; From here on we have the next containing sexp in lim.
10544 (setq lim
(c-most-enclosing-brace paren-state containing-sexp
))
10545 (c-after-conditional))
10546 (c-backward-to-block-anchor lim
)
10547 (c-add-stmt-syntax 'statement-block-intro nil t
10549 (if (eq char-after-ip ?
{)
10550 (c-add-syntax 'block-open
)))
10552 ;; CASE 17E: first statement in an in-expression block.
10553 ;; C.f. cases 4, 7B and 16A.
10554 ((setq placeholder
(c-looking-at-inexpr-block
10555 (c-safe-position containing-sexp paren-state
)
10557 (setq tmpsymbol
(if (eq (car placeholder
) 'inlambda
)
10559 'statement-block-intro
))
10560 (back-to-indentation)
10561 (if (= containing-sexp
(point))
10562 (c-add-syntax tmpsymbol
(point))
10563 (goto-char (cdr placeholder
))
10564 (back-to-indentation)
10565 (c-add-stmt-syntax tmpsymbol nil t
10566 (c-most-enclosing-brace c-state-cache
(point))
10568 (if (/= (point) (cdr placeholder
))
10569 (c-add-syntax (car placeholder
))))
10570 (if (eq char-after-ip ?
{)
10571 (c-add-syntax 'block-open
)))
10573 ;; CASE 17F: first statement in an inline, or first
10574 ;; statement in a top-level defun. we can tell this is it
10575 ;; if there are no enclosing braces that haven't been
10576 ;; narrowed out by a class (i.e. don't use bod here).
10578 (or (not (setq placeholder
(c-most-enclosing-brace
10581 (goto-char placeholder
)
10582 (eq (char-after) ?
{))
10583 (c-looking-at-decl-block (c-most-enclosing-brace
10584 paren-state
(point))
10586 (c-backward-to-decl-anchor lim
)
10587 (back-to-indentation)
10588 (c-add-syntax 'defun-block-intro
(point)))
10590 ;; CASE 17G: First statement in a function declared inside
10591 ;; a normal block. This can occur in Pike and with
10592 ;; e.g. the gcc extensions, but watch out for macros
10593 ;; followed by blocks. C.f. cases B.3 and 16F.
10595 (and (not (c-at-statement-start-p))
10596 (eq (c-beginning-of-statement-1 lim nil nil t
) 'same
)
10597 (setq placeholder
(point))
10598 (let ((c-recognize-typeless-decls nil
))
10599 ;; Turn off recognition of constructs that lacks
10600 ;; a type in this case, since that's more likely
10601 ;; to be a macro followed by a block.
10602 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
10603 (back-to-indentation)
10604 (if (/= (point) containing-sexp
)
10605 (goto-char placeholder
))
10606 (c-add-stmt-syntax 'defun-block-intro nil t
10609 ;; CASE 17H: First statement in a block.
10611 ;; If the block is preceded by a case/switch label on the
10612 ;; same line, we anchor at the first preceding label at
10613 ;; boi. The default handling in c-add-stmt-syntax is
10614 ;; really fixes it better, but we do like this to keep the
10615 ;; indentation compatible with version 5.28 and earlier.
10617 (while (and (/= (setq placeholder
(point)) (c-point 'boi
))
10618 (eq (c-beginning-of-statement-1 lim
) 'label
)))
10619 (goto-char placeholder
)
10620 (if (looking-at c-label-kwds-regexp
)
10621 (c-add-syntax 'statement-block-intro
(point))
10622 (goto-char containing-sexp
)
10623 ;; c-backward-to-block-anchor not necessary here; those
10624 ;; situations are handled in case 17I above.
10625 (c-add-stmt-syntax 'statement-block-intro nil t
10627 (if (eq char-after-ip ?
{)
10628 (c-add-syntax 'block-open
)))
10632 ;; now we need to look at any modifiers
10633 (goto-char indent-point
)
10634 (skip-chars-forward " \t")
10636 ;; are we looking at a comment only line?
10637 (when (and (looking-at c-comment-start-regexp
)
10638 (/= (c-forward-token-2 0 nil
(c-point 'eol
)) 0))
10639 (c-append-syntax 'comment-intro
))
10641 ;; we might want to give additional offset to friends (in C++).
10642 (when (and c-opt-friend-key
10643 (looking-at c-opt-friend-key
))
10644 (c-append-syntax 'friend
))
10646 ;; Set syntactic-relpos.
10647 (let ((p c-syntactic-context
))
10649 (if (integerp (c-langelem-pos (car p
)))
10651 (setq syntactic-relpos
(c-langelem-pos (car p
)))
10656 ;; Start of or a continuation of a preprocessor directive?
10657 (if (and macro-start
10658 (eq macro-start
(c-point 'boi
))
10659 (not (and (c-major-mode-is 'pike-mode
)
10660 (eq (char-after (1+ macro-start
)) ?
\"))))
10661 (c-append-syntax 'cpp-macro
)
10662 (when (and c-syntactic-indentation-in-macros macro-start
)
10665 (< syntactic-relpos macro-start
)
10667 (assq 'arglist-intro c-syntactic-context
)
10668 (assq 'arglist-cont c-syntactic-context
)
10669 (assq 'arglist-cont-nonempty c-syntactic-context
)
10670 (assq 'arglist-close c-syntactic-context
))))
10671 ;; If inside a cpp expression, i.e. anywhere in a
10672 ;; cpp directive except a #define body, we only let
10673 ;; through the syntactic analysis that is internal
10674 ;; in the expression. That means the arglist
10675 ;; elements, if they are anchored inside the cpp
10677 (setq c-syntactic-context nil
)
10678 (c-add-syntax 'cpp-macro-cont macro-start
))
10679 (when (and (eq macro-start syntactic-relpos
)
10680 (not (assq 'cpp-define-intro c-syntactic-context
))
10682 (goto-char macro-start
)
10683 (or (not (c-forward-to-cpp-define-body))
10684 (<= (point) (c-point 'boi indent-point
)))))
10685 ;; Inside a #define body and the syntactic analysis is
10686 ;; anchored on the start of the #define. In this case
10687 ;; we add cpp-define-intro to get the extra
10688 ;; indentation of the #define body.
10689 (c-add-syntax 'cpp-define-intro
)))))
10691 ;; return the syntax
10692 c-syntactic-context
)))
10695 ;; Indentation calculation.
10697 (defun c-evaluate-offset (offset langelem symbol
)
10698 ;; offset can be a number, a function, a variable, a list, or one of
10699 ;; the symbols + or -
10701 ;; This function might do hidden buffer changes.
10704 ((numberp offset
) offset
)
10705 ((vectorp offset
) offset
)
10706 ((null offset
) nil
)
10708 ((eq offset
'+) c-basic-offset
)
10709 ((eq offset
'-
) (- c-basic-offset
))
10710 ((eq offset
'++) (* 2 c-basic-offset
))
10711 ((eq offset
'--
) (* 2 (- c-basic-offset
)))
10712 ((eq offset
'*) (/ c-basic-offset
2))
10713 ((eq offset
'/) (/ (- c-basic-offset
) 2))
10715 ((functionp offset
)
10718 (cons (c-langelem-sym langelem
)
10719 (c-langelem-pos langelem
)))
10724 ((eq (car offset
) 'quote
)
10725 (c-benign-error "The offset %S for %s was mistakenly quoted"
10729 ((memq (car offset
) '(min max
))
10730 (let (res val
(method (car offset
)))
10731 (setq offset
(cdr offset
))
10733 (setq val
(c-evaluate-offset (car offset
) langelem symbol
))
10741 Error evaluating offset %S for %s: \
10742 Cannot combine absolute offset %S with relative %S in `%s' method"
10743 (car offset
) symbol res val method
)
10744 (setq res
(funcall method res val
))))
10748 Error evaluating offset %S for %s: \
10749 Cannot combine relative offset %S with absolute %S in `%s' method"
10750 (car offset
) symbol res val method
)
10751 (setq res
(vector (funcall method
(aref res
0)
10753 (setq offset
(cdr offset
)))
10756 ((eq (car offset
) 'add
)
10758 (setq offset
(cdr offset
))
10760 (setq val
(c-evaluate-offset (car offset
) langelem symbol
))
10767 (setq res
(vector (+ (aref res
0) val
)))
10768 (setq res
(+ res val
))))
10772 Error evaluating offset %S for %s: \
10773 Cannot combine absolute offsets %S and %S in `add' method"
10774 (car offset
) symbol res val
)
10775 (setq res val
)))) ; Override.
10776 (setq offset
(cdr offset
)))
10781 (when (eq (car offset
) 'first
)
10782 (setq offset
(cdr offset
)))
10783 (while (and (not res
) offset
)
10784 (setq res
(c-evaluate-offset (car offset
) langelem symbol
)
10785 offset
(cdr offset
)))
10788 ((and (symbolp offset
) (boundp offset
))
10789 (symbol-value offset
))
10792 (c-benign-error "Unknown offset format %S for %s" offset symbol
)
10795 (if (or (null res
) (integerp res
)
10796 (and (vectorp res
) (= (length res
) 1) (integerp (aref res
0))))
10798 (c-benign-error "Error evaluating offset %S for %s: Got invalid value %S"
10802 (defun c-calc-offset (langelem)
10803 ;; Get offset from LANGELEM which is a list beginning with the
10804 ;; syntactic symbol and followed by any analysis data it provides.
10805 ;; That data may be zero or more elements, but if at least one is
10806 ;; given then the first is the anchor position (or nil). The symbol
10807 ;; is matched against `c-offsets-alist' and the offset calculated
10808 ;; from that is returned.
10810 ;; This function might do hidden buffer changes.
10811 (let* ((symbol (c-langelem-sym langelem
))
10812 (match (assq symbol c-offsets-alist
))
10813 (offset (cdr-safe match
)))
10815 (setq offset
(c-evaluate-offset offset langelem symbol
))
10816 (if c-strict-syntax-p
10817 (c-benign-error "No offset found for syntactic symbol %s" symbol
))
10819 (if (vectorp offset
)
10821 (or (and (numberp offset
) offset
)
10822 (and (symbolp offset
) (symbol-value offset
))
10826 (defun c-get-offset (langelem)
10827 ;; This is a compatibility wrapper for `c-calc-offset' in case
10828 ;; someone is calling it directly. It takes an old style syntactic
10829 ;; element on the form (SYMBOL . ANCHOR-POS) and converts it to the
10832 ;; This function might do hidden buffer changes.
10833 (if (c-langelem-pos langelem
)
10834 (c-calc-offset (list (c-langelem-sym langelem
)
10835 (c-langelem-pos langelem
)))
10836 (c-calc-offset langelem
)))
10838 (defun c-get-syntactic-indentation (langelems)
10839 ;; Calculate the syntactic indentation from a syntactic description
10840 ;; as returned by `c-guess-syntax'.
10842 ;; Note that topmost-intro always has an anchor position at bol, for
10843 ;; historical reasons. It's often used together with other symbols
10844 ;; that has more sane positions. Since we always use the first
10845 ;; found anchor position, we rely on that these other symbols always
10846 ;; precede topmost-intro in the LANGELEMS list.
10848 ;; This function might do hidden buffer changes.
10849 (let ((indent 0) anchor
)
10852 (let* ((c-syntactic-element (car langelems
))
10853 (res (c-calc-offset c-syntactic-element
)))
10856 ;; Got an absolute column that overrides any indentation
10857 ;; we've collected so far, but not the relative
10858 ;; indentation we might get for the nested structures
10859 ;; further down the langelems list.
10860 (setq indent
(elt res
0)
10861 anchor
(point-min)) ; A position at column 0.
10863 ;; Got a relative change of the current calculated
10865 (setq indent
(+ indent res
))
10867 ;; Use the anchor position from the first syntactic
10868 ;; element with one.
10870 (setq anchor
(c-langelem-pos (car langelems
)))))
10872 (setq langelems
(cdr langelems
))))
10875 (+ indent
(save-excursion
10881 (cc-provide 'cc-engine
)
10883 ;;; cc-engine.el ends here