1 ;;; cc-engine.el --- core syntax guessing engine for CC mode
3 ;; Copyright (C) 1985, 1987, 1992-2011 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 (defun c-beginning-of-macro (&optional lim
)
223 "Go to the beginning of a preprocessor directive.
224 Leave point at the beginning of the directive and return t if in one,
225 otherwise return nil and leave point unchanged.
227 Note that this function might do hidden buffer changes. See the
228 comment at the start of cc-engine.el for more info."
229 (when c-opt-cpp-prefix
230 (let ((here (point)))
232 (if lim
(narrow-to-region lim
(point-max)))
234 (while (eq (char-before (1- (point))) ?
\\)
236 (back-to-indentation)
237 (if (and (<= (point) here
)
238 (looking-at c-opt-cpp-start
))
243 (defun c-end-of-macro ()
244 "Go to the end of a preprocessor directive.
245 More accurately, move the point to the end of the closest following
246 line that doesn't end with a line continuation backslash - no check is
247 done that the point is inside a cpp directive to begin with.
249 Note that this function might do hidden buffer changes. See the
250 comment at the start of cc-engine.el for more info."
253 (when (and (eq (char-before) ?
\\)
258 (defun c-syntactic-end-of-macro ()
259 ;; Go to the end of a CPP directive, or a "safe" pos just before.
261 ;; This is normally the end of the next non-escaped line. A "safe"
262 ;; position is one not within a string or comment. (The EOL on a line
263 ;; comment is NOT "safe").
265 ;; This function must only be called from the beginning of a CPP construct.
267 ;; Note that this function might do hidden buffer changes. See the comment
268 ;; at the start of cc-engine.el for more info.
269 (let* ((here (point))
270 (there (progn (c-end-of-macro) (point)))
271 (s (parse-partial-sexp here there
)))
272 (while (and (or (nth 3 s
) ; in a string
273 (nth 4 s
)) ; in a comment (maybe at end of line comment)
274 (> there here
)) ; No infinite loops, please.
275 (setq there
(1- (nth 8 s
)))
276 (setq s
(parse-partial-sexp here there
)))
279 (defun c-forward-over-cpp-define-id ()
280 ;; Assuming point is at the "#" that introduces a preprocessor
281 ;; directive, it's moved forward to the end of the identifier which is
282 ;; "#define"d (or whatever c-opt-cpp-macro-define specifies). Non-nil
283 ;; is returned in this case, in all other cases nil is returned and
284 ;; point isn't moved.
286 ;; This function might do hidden buffer changes.
287 (when (and c-opt-cpp-macro-define-id
288 (looking-at c-opt-cpp-macro-define-id
))
289 (goto-char (match-end 0))))
291 (defun c-forward-to-cpp-define-body ()
292 ;; Assuming point is at the "#" that introduces a preprocessor
293 ;; directive, it's moved forward to the start of the definition body
294 ;; if it's a "#define" (or whatever c-opt-cpp-macro-define
295 ;; specifies). Non-nil is returned in this case, in all other cases
296 ;; nil is returned and point isn't moved.
298 ;; This function might do hidden buffer changes.
299 (when (and c-opt-cpp-macro-define-start
300 (looking-at c-opt-cpp-macro-define-start
)
301 (not (= (match-end 0) (c-point 'eol
))))
302 (goto-char (match-end 0))))
305 ;;; Basic utility functions.
307 (defun c-syntactic-content (from to paren-level
)
308 ;; Return the given region as a string where all syntactic
309 ;; whitespace is removed or, where necessary, replaced with a single
310 ;; space. If PAREN-LEVEL is given then all parens in the region are
311 ;; collapsed to "()", "[]" etc.
313 ;; This function might do hidden buffer changes.
317 (narrow-to-region from to
)
319 (let* ((parts (list nil
)) (tail parts
) pos in-paren
)
321 (while (re-search-forward c-syntactic-ws-start to t
)
322 (goto-char (setq pos
(match-beginning 0)))
323 (c-forward-syntactic-ws)
329 (setq in-paren
(= (car (parse-partial-sexp from pos
1)) 1)
332 (if (and (> pos from
)
334 (looking-at "\\w\\|\\s_")
337 (looking-at "\\w\\|\\s_")))
339 (setcdr tail
(list (buffer-substring-no-properties from pos
)
341 (setq tail
(cddr tail
)))
342 (setcdr tail
(list (buffer-substring-no-properties from pos
)))
343 (setq tail
(cdr tail
)))
346 (when (= (car (parse-partial-sexp pos to -
1)) -
1)
347 (setcdr tail
(list (buffer-substring-no-properties
348 (1- (point)) (point))))
349 (setq tail
(cdr tail
))))
351 (setq from
(point))))
353 (setcdr tail
(list (buffer-substring-no-properties from to
)))
354 (apply 'concat
(cdr parts
))))))
356 (defun c-shift-line-indentation (shift-amt)
357 ;; Shift the indentation of the current line with the specified
358 ;; amount (positive inwards). The buffer is modified only if
359 ;; SHIFT-AMT isn't equal to zero.
360 (let ((pos (- (point-max) (point)))
361 (c-macro-start c-macro-start
)
363 (if (zerop shift-amt
)
365 ;; If we're on an empty line inside a macro, we take the point
366 ;; to be at the current indentation and shift it to the
367 ;; appropriate column. This way we don't treat the extra
368 ;; whitespace out to the line continuation as indentation.
369 (when (and (c-query-and-set-macro-start)
370 (looking-at "[ \t]*\\\\$")
372 (skip-chars-backward " \t")
376 (setq tmp-char-inserted t
))
378 (let ((col (current-indentation)))
379 (delete-region (c-point 'bol
) (c-point 'boi
))
381 (indent-to (+ col shift-amt
)))
382 (when tmp-char-inserted
384 ;; If initial point was within line's indentation and we're not on
385 ;; a line with a line continuation in a macro, position after the
386 ;; indentation. Else stay at same point in text.
387 (if (and (< (point) (c-point 'boi
))
388 (not tmp-char-inserted
))
389 (back-to-indentation)
390 (if (> (- (point-max) pos
) (point))
391 (goto-char (- (point-max) pos
))))))
393 (defsubst c-keyword-sym
(keyword)
394 ;; Return non-nil if the string KEYWORD is a known keyword. More
395 ;; precisely, the value is the symbol for the keyword in
396 ;; `c-keywords-obarray'.
397 (intern-soft keyword c-keywords-obarray
))
399 (defsubst c-keyword-member
(keyword-sym lang-constant
)
400 ;; Return non-nil if the symbol KEYWORD-SYM, as returned by
401 ;; `c-keyword-sym', is a member of LANG-CONSTANT, which is the name
402 ;; of a language constant that ends with "-kwds". If KEYWORD-SYM is
403 ;; nil then the result is nil.
404 (get keyword-sym lang-constant
))
406 ;; String syntax chars, suitable for skip-syntax-(forward|backward).
407 (defconst c-string-syntax
(if (memq 'gen-string-delim c-emacs-features
)
411 ;; Regexp matching string limit syntax.
412 (defconst c-string-limit-regexp
(if (memq 'gen-string-delim c-emacs-features
)
416 ;; Regexp matching WS followed by string limit syntax.
417 (defconst c-ws
*-string-limit-regexp
418 (concat "[ \t]*\\(" c-string-limit-regexp
"\\)"))
420 ;; Holds formatted error strings for the few cases where parse errors
422 (defvar c-parsing-error nil
)
423 (make-variable-buffer-local 'c-parsing-error
)
425 (defun c-echo-parsing-error (&optional quiet
)
426 (when (and c-report-syntactic-errors c-parsing-error
(not quiet
))
427 (c-benign-error "%s" c-parsing-error
))
430 ;; Faces given to comments and string literals. This is used in some
431 ;; situations to speed up recognition; it isn't mandatory that font
432 ;; locking is in use. This variable is extended with the face in
433 ;; `c-doc-face-name' when fontification is activated in cc-fonts.el.
434 (defvar c-literal-faces
435 (append '(font-lock-comment-face font-lock-string-face
)
436 (when (facep 'font-lock-comment-delimiter-face
)
438 '(font-lock-comment-delimiter-face))))
440 (defsubst c-put-c-type-property
(pos value
)
441 ;; Put a c-type property with the given value at POS.
442 (c-put-char-property pos
'c-type value
))
444 (defun c-clear-c-type-property (from to value
)
445 ;; Remove all occurrences of the c-type property that has the given
446 ;; value in the region between FROM and TO. VALUE is assumed to not
449 ;; Note: This assumes that c-type is put on single chars only; it's
450 ;; very inefficient if matching properties cover large regions.
454 (when (eq (get-text-property (point) 'c-type
) value
)
455 (c-clear-char-property (point) 'c-type
))
456 (goto-char (next-single-property-change (point) 'c-type nil to
))
460 ;; Some debug tools to visualize various special positions. This
461 ;; debug code isn't as portable as the rest of CC Mode.
463 (cc-bytecomp-defun overlays-in)
464 (cc-bytecomp-defun overlay-get)
465 (cc-bytecomp-defun overlay-start)
466 (cc-bytecomp-defun overlay-end)
467 (cc-bytecomp-defun delete-overlay)
468 (cc-bytecomp-defun overlay-put)
469 (cc-bytecomp-defun make-overlay)
471 (defun c-debug-add-face (beg end face
)
472 (c-save-buffer-state ((overlays (overlays-in beg end
)) overlay
)
474 (setq overlay
(car overlays
)
475 overlays
(cdr overlays
))
476 (when (eq (overlay-get overlay
'face
) face
)
477 (setq beg
(min beg
(overlay-start overlay
))
478 end
(max end
(overlay-end overlay
)))
479 (delete-overlay overlay
)))
480 (overlay-put (make-overlay beg end
) 'face face
)))
482 (defun c-debug-remove-face (beg end face
)
483 (c-save-buffer-state ((overlays (overlays-in beg end
)) overlay
484 (ol-beg beg
) (ol-end end
))
486 (setq overlay
(car overlays
)
487 overlays
(cdr overlays
))
488 (when (eq (overlay-get overlay
'face
) face
)
489 (setq ol-beg
(min ol-beg
(overlay-start overlay
))
490 ol-end
(max ol-end
(overlay-end overlay
)))
491 (delete-overlay overlay
)))
493 (overlay-put (make-overlay ol-beg beg
) 'face face
))
495 (overlay-put (make-overlay end ol-end
) 'face face
))))
498 ;; `c-beginning-of-statement-1' and accompanying stuff.
500 ;; KLUDGE ALERT: c-maybe-labelp is used to pass information between
501 ;; c-crosses-statement-barrier-p and c-beginning-of-statement-1. A
502 ;; better way should be implemented, but this will at least shut up
503 ;; the byte compiler.
504 (defvar c-maybe-labelp
)
506 ;; New awk-compatible version of c-beginning-of-statement-1, ACM 2002/6/22
508 ;; Macros used internally in c-beginning-of-statement-1 for the
509 ;; automaton actions.
510 (defmacro c-bos-push-state
()
511 '(setq stack
(cons (cons state saved-pos
)
513 (defmacro c-bos-pop-state
(&optional do-if-done
)
514 `(if (setq state
(car (car stack
))
515 saved-pos
(cdr (car stack
))
520 (defmacro c-bos-pop-state-and-retry
()
521 '(throw 'loop
(setq state
(car (car stack
))
522 saved-pos
(cdr (car stack
))
523 ;; Throw nil if stack is empty, else throw non-nil.
525 (defmacro c-bos-save-pos
()
526 '(setq saved-pos
(vector pos tok ptok pptok
)))
527 (defmacro c-bos-restore-pos
()
528 '(unless (eq (elt saved-pos
0) start
)
529 (setq pos
(elt saved-pos
0)
530 tok
(elt saved-pos
1)
531 ptok
(elt saved-pos
2)
532 pptok
(elt saved-pos
3))
535 (defmacro c-bos-save-error-info
(missing got
)
536 `(setq saved-pos
(vector pos
,missing
,got
)))
537 (defmacro c-bos-report-error
()
539 (setq c-parsing-error
540 (format "No matching `%s' found for `%s' on line %d"
543 (1+ (count-lines (point-min)
544 (c-point 'bol
(elt saved-pos
0))))))))
546 (defun c-beginning-of-statement-1 (&optional lim ignore-labels
548 "Move to the start of the current statement or declaration, or to
549 the previous one if already at the beginning of one. Only
550 statements/declarations on the same level are considered, i.e. don't
551 move into or out of sexps (not even normal expression parentheses).
553 If point is already at the earliest statement within braces or parens,
554 this function doesn't move back into any whitespace preceding it; it
555 returns 'same in this case.
557 Stop at statement continuation tokens like \"else\", \"catch\",
558 \"finally\" and the \"while\" in \"do ... while\" if the start point
559 is within the continuation. If starting at such a token, move to the
560 corresponding statement start. If at the beginning of a statement,
561 move to the closest containing statement if there is any. This might
562 also stop at a continuation clause.
564 Labels are treated as part of the following statements if
565 IGNORE-LABELS is non-nil. (FIXME: Doesn't work if we stop at a known
566 statement start keyword.) Otherwise, each label is treated as a
569 Macros are ignored \(i.e. skipped over) unless point is within one, in
570 which case the content of the macro is treated as normal code. Aside
571 from any normal statement starts found in it, stop at the first token
572 of the content in the macro, i.e. the expression of an \"#if\" or the
573 start of the definition in a \"#define\". Also stop at start of
574 macros before leaving them.
577 'label if stopped at a label or \"case...:\" or \"default:\";
578 'same if stopped at the beginning of the current statement;
579 'up if stepped to a containing statement;
580 'previous if stepped to a preceding statement;
581 'beginning if stepped from a statement continuation clause to
583 'macro if stepped to a macro start.
584 Note that 'same and not 'label is returned if stopped at the same
585 label without crossing the colon character.
587 LIM may be given to limit the search. If the search hits the limit,
588 point will be left at the closest following token, or at the start
589 position if that is less ('same is returned in this case).
591 NOERROR turns off error logging to `c-parsing-error'.
593 Normally only ';' and virtual semicolons are considered to delimit
594 statements, but if COMMA-DELIM is non-nil then ',' is treated
597 Note that this function might do hidden buffer changes. See the
598 comment at the start of cc-engine.el for more info."
600 ;; The bulk of this function is a pushdown automaton that looks at statement
601 ;; boundaries and the tokens (such as "while") in c-opt-block-stmt-key. Its
602 ;; purpose is to keep track of nested statements, ensuring that such
603 ;; statements are skipped over in their entirety (somewhat akin to what C-M-p
604 ;; does with nested braces/brackets/parentheses).
606 ;; Note: The position of a boundary is the following token.
608 ;; Beginning with the current token (the one following point), move back one
609 ;; sexp at a time (where a sexp is, more or less, either a token or the
610 ;; entire contents of a brace/bracket/paren pair). Each time a statement
611 ;; boundary is crossed or a "while"-like token is found, update the state of
612 ;; the PDA. Stop at the beginning of a statement when the stack (holding
613 ;; nested statement info) is empty and the position has been moved.
615 ;; The following variables constitute the PDA:
617 ;; sym: This is either the "while"-like token (e.g. 'for) we've just
618 ;; scanned back over, 'boundary if we've just gone back over a
619 ;; statement boundary, or nil otherwise.
620 ;; state: takes one of the values (nil else else-boundary while
621 ;; while-boundary catch catch-boundary).
622 ;; nil means "no "while"-like token yet scanned".
623 ;; 'else, for example, means "just gone back over an else".
624 ;; 'else-boundary means "just gone back over a statement boundary
625 ;; immediately after having gone back over an else".
626 ;; saved-pos: A vector of either saved positions (tok ptok pptok, etc.) or
627 ;; of error reporting information.
628 ;; stack: The stack onto which the PDA pushes its state. Each entry
629 ;; consists of a saved value of state and saved-pos. An entry is
630 ;; pushed when we move back over a "continuation" token (e.g. else)
631 ;; and popped when we encounter the corresponding opening token
635 ;; The following diagram briefly outlines the PDA.
638 ;; "else": Push state, goto state `else'.
639 ;; "while": Push state, goto state `while'.
640 ;; "catch" or "finally": Push state, goto state `catch'.
641 ;; boundary: Pop state.
642 ;; other: Do nothing special.
645 ;; boundary: Goto state `else-boundary'.
646 ;; other: Error, pop state, retry token.
648 ;; State `else-boundary':
650 ;; boundary: Error, pop state.
651 ;; other: See common state.
654 ;; boundary: Save position, goto state `while-boundary'.
655 ;; other: Pop state, retry token.
657 ;; State `while-boundary':
659 ;; boundary: Restore position if it's not at start, pop state. [*see below]
660 ;; other: See common state.
663 ;; boundary: Goto state `catch-boundary'.
664 ;; other: Error, pop state, retry token.
666 ;; State `catch-boundary':
668 ;; "catch": Goto state `catch'.
669 ;; boundary: Error, pop state.
670 ;; other: See common state.
672 ;; [*] In the `while-boundary' state, we had pushed a 'while state, and were
673 ;; searching for a "do" which would have opened a do-while. If we didn't
674 ;; find it, we discard the analysis done since the "while", go back to this
675 ;; token in the buffer and restart the scanning there, this time WITHOUT
676 ;; pushing the 'while state onto the stack.
678 ;; In addition to the above there is some special handling of labels
681 (let ((case-fold-search nil
)
684 (delims (if comma-delim
'(?\
; ?,) '(?\;)))
685 (c-stmt-delim-chars (if comma-delim
686 c-stmt-delim-chars-with-comma
688 c-in-literal-cache c-maybe-labelp after-case
:-pos saved
691 ;; Position of last stmt boundary character (e.g. ;).
693 ;; The position of the last sexp or bound that follows the
694 ;; first found colon, i.e. the start of the nonlabel part of
695 ;; the statement. It's `start' if a colon is found just after
698 ;; Like `after-labels-pos', but the first such position inside
699 ;; a label, i.e. the start of the last label before the start
700 ;; of the nonlabel part of the statement.
702 ;; The last position where a label is possible provided the
703 ;; statement started there. It's nil as long as no invalid
704 ;; label content has been found (according to
705 ;; `c-nonlabel-token-key'). It's `start' if no valid label
706 ;; content was found in the label. Note that we might still
707 ;; regard it a label if it starts with `c-label-kwds'.
709 ;; Putative positions of the components of a bitfield declaration,
710 ;; e.g. "int foo : NUM_FOO_BITS ;"
711 bitfield-type-pos bitfield-id-pos bitfield-size-pos
712 ;; Symbol just scanned back over (e.g. 'while or 'boundary).
715 ;; Current state in the automaton. See above.
717 ;; Current saved positions. See above.
719 ;; Stack of conses (state . saved-pos).
721 ;; Regexp which matches "for", "if", etc.
722 (cond-key (or c-opt-block-stmt-key
723 "\\<\\>")) ; Matches nothing.
726 ;; Positions of the last three sexps or bounds we've stopped at.
730 (if lim
(narrow-to-region lim
(point-max)))
733 (and (c-beginning-of-macro)
735 (setq macro-start
(point)))
737 ;; Try to skip back over unary operator characters, to register
741 (c-backward-syntactic-ws)
742 ;; Protect post-++/-- operators just before a virtual semicolon.
743 (and (not (c-at-vsemi-p))
744 (/= (skip-chars-backward "-+!*&~@`#") 0))))
746 ;; Skip back over any semicolon here. If it was a bare semicolon, we're
747 ;; done. Later on we ignore the boundaries for statements that don't
748 ;; contain any sexp. The only thing that is affected is that the error
749 ;; checking is a little less strict, and we really don't bother.
750 (if (and (memq (char-before) delims
)
751 (progn (forward-char -
1)
753 (c-backward-syntactic-ws)
754 (or (memq (char-before) delims
)
755 (memq (char-before) '(?
: nil
))
756 (eq (char-syntax (char-before)) ?\
()
761 ;; Begin at start and not pos to detect macros if we stand
762 ;; directly after the #.
764 (if (looking-at "\\<\\|\\W")
765 ;; Record this as the first token if not starting inside it.
769 ;; The following while loop goes back one sexp (balanced parens,
770 ;; etc. with contents, or symbol or suchlike) each iteration. This
771 ;; movement is accomplished with a call to c-backward-sexp approx 170
774 ;; The loop is exited only by throwing nil to the (catch 'loop ...):
775 ;; 1. On reaching the start of a macro;
776 ;; 2. On having passed a stmt boundary with the PDA stack empty;
777 ;; 3. On reaching the start of an Objective C method def;
778 ;; 4. From macro `c-bos-pop-state'; when the stack is empty;
779 ;; 5. From macro `c-bos-pop-state-and-retry' when the stack is empty.
781 (catch 'loop
;; Throw nil to break, non-nil to continue.
783 ;; Are we in a macro, just after the opening #?
785 (and macro-start
; Always NIL for AWK.
786 (progn (skip-chars-backward " \t")
787 (eq (char-before) ?
#))
788 (progn (setq saved
(1- (point)))
790 (not (eq (char-before (1- (point))) ?
\\)))
791 (looking-at c-opt-cpp-start
)
792 (progn (skip-chars-forward " \t")
793 (eq (point) saved
))))
795 (if (and (c-forward-to-cpp-define-body)
796 (progn (c-forward-syntactic-ws start
)
798 ;; Stop at the first token in the content of the macro.
800 ignore-labels t
) ; Avoid the label check on exit.
804 (throw 'loop nil
)) ; 1. Start of macro.
806 ;; Do a round through the automaton if we've just passed a
807 ;; statement boundary or passed a "while"-like token.
809 (and (looking-at cond-key
)
810 (setq sym
(intern (match-string 1)))))
812 (when (and (< pos start
) (null stack
))
813 (throw 'loop nil
)) ; 2. Statement boundary.
815 ;; The PDA state handling.
817 ;; Refer to the description of the PDA in the opening
818 ;; comments. In the following OR form, the first leaf
819 ;; attempts to handles one of the specific actions detailed
820 ;; (e.g., finding token "if" whilst in state `else-boundary').
821 ;; We drop through to the second leaf (which handles common
822 ;; state) if no specific handler is found in the first cond.
823 ;; If a parsing error is detected (e.g. an "else" with no
824 ;; preceding "if"), we throw to the enclosing catch.
826 ;; Note that the (eq state 'else) means
827 ;; "we've just passed an else", NOT "we're looking for an
831 (if (eq sym
'boundary
)
832 (setq state
'else-boundary
)
834 (c-bos-pop-state-and-retry)))
836 ((eq state
'else-boundary
)
838 (c-bos-pop-state (setq ret
'beginning
)))
844 (if (and (eq sym
'boundary
)
845 ;; Since this can cause backtracking we do a
846 ;; little more careful analysis to avoid it:
847 ;; If there's a label in front of the while
848 ;; it can't be part of a do-while.
849 (not after-labels-pos
))
850 (progn (c-bos-save-pos)
851 (setq state
'while-boundary
))
852 (c-bos-pop-state-and-retry))) ; Can't be a do-while
854 ((eq state
'while-boundary
)
856 (c-bos-pop-state (setq ret
'beginning
)))
857 ((eq sym
'boundary
) ; isn't a do-while
858 (c-bos-restore-pos) ; the position of the while
859 (c-bos-pop-state)))) ; no longer searching for do.
862 (if (eq sym
'boundary
)
863 (setq state
'catch-boundary
)
865 (c-bos-pop-state-and-retry)))
867 ((eq state
'catch-boundary
)
870 (c-bos-pop-state (setq ret
'beginning
)))
875 (c-bos-pop-state)))))
877 ;; This is state common. We get here when the previous
878 ;; cond statement found no particular state handler.
879 (cond ((eq sym
'boundary
)
880 ;; If we have a boundary at the start
881 ;; position we push a frame to go to the
882 ;; previous statement.
888 (c-bos-save-error-info 'if
'else
)
891 ;; Is this a real while, or a do-while?
892 ;; The next `when' triggers unless we are SURE that
893 ;; the `while' is not the tail end of a `do-while'.
894 (when (or (not pptok
)
895 (memq (char-after pptok
) delims
)
896 ;; The following kludge is to prevent
897 ;; infinite recursion when called from
898 ;; c-awk-after-if-for-while-condition-p,
900 (and (eq (point) start
)
901 (c-vsemi-status-unknown-p))
902 (c-at-vsemi-p pptok
))
903 ;; Since this can cause backtracking we do a
904 ;; little more careful analysis to avoid it: If
905 ;; the while isn't followed by a (possibly
906 ;; virtual) semicolon it can't be a do-while.
908 (setq state
'while
)))
909 ((memq sym
'(catch finally
))
911 (c-bos-save-error-info 'try sym
)
912 (setq state
'catch
))))
915 ;; We're either past a statement boundary or at the
916 ;; start of a statement, so throw away any label data
917 ;; for the previous one.
918 (setq after-labels-pos nil
920 c-maybe-labelp nil
))))
922 ;; Step to the previous sexp, but not if we crossed a
923 ;; boundary, since that doesn't consume an sexp.
924 (if (eq sym
'boundary
)
927 ;; HERE IS THE SINGLE PLACE INSIDE THE PDA LOOP WHERE WE MOVE
928 ;; BACKWARDS THROUGH THE SOURCE.
930 (c-backward-syntactic-ws)
931 (let ((before-sws-pos (point))
932 ;; The end position of the area to search for statement
933 ;; barriers in this round.
934 (maybe-after-boundary-pos pos
))
936 ;; Go back over exactly one logical sexp, taking proper
937 ;; account of macros and escaped EOLs.
940 (unless (c-safe (c-backward-sexp) t
)
941 ;; Give up if we hit an unbalanced block. Since the
942 ;; stack won't be empty the code below will report a
946 ;; Have we moved into a macro?
947 ((and (not macro-start
)
948 (c-beginning-of-macro))
949 ;; Have we crossed a statement boundary? If not,
950 ;; keep going back until we find one or a "real" sexp.
954 (not (c-crosses-statement-barrier-p
955 (point) maybe-after-boundary-pos
)))
956 (setq maybe-after-boundary-pos
(point))))
957 ;; Have we just gone back over an escaped NL? This
958 ;; doesn't count as a sexp.
959 ((looking-at "\\\\$")))))
961 ;; Have we crossed a statement boundary?
964 ;; Are we at a macro beginning?
965 ((and (not macro-start
)
967 (looking-at c-opt-cpp-prefix
))
970 (c-crosses-statement-barrier-p
971 (point) maybe-after-boundary-pos
)))
972 ;; Just gone back over a brace block?
975 (not (c-looking-at-inexpr-block lim nil t
)))
977 (c-forward-sexp) (point)))
978 ;; Just gone back over some paren block?
979 ((looking-at "\\s\(")
981 (goto-char (1+ (c-down-list-backward
983 (c-crosses-statement-barrier-p
984 (point) maybe-after-boundary-pos
)))
985 ;; Just gone back over an ordinary symbol of some sort?
986 (t (c-crosses-statement-barrier-p
987 (point) maybe-after-boundary-pos
))))
994 ;; Like a C "continue". Analyze the next sexp.
998 (when (and c-opt-method-key
999 (setq saved
(c-in-method-def-p)))
1001 ignore-labels t
) ; Avoid the label check on exit.
1002 (throw 'loop nil
)) ; 3. ObjC method def.
1004 ;; Might we have a bitfield declaration, "<type> <id> : <size>"?
1007 ;; The : <size> and <id> fields?
1008 ((and (numberp c-maybe-labelp
)
1009 (not bitfield-size-pos
)
1011 (goto-char (or tok start
))
1012 (not (looking-at c-keywords-regexp
)))
1013 (not (looking-at c-keywords-regexp
))
1014 (not (c-punctuation-in (point) c-maybe-labelp
)))
1015 (setq bitfield-size-pos
(or tok start
)
1016 bitfield-id-pos
(point)))
1017 ;; The <type> field?
1018 ((and bitfield-id-pos
1019 (not bitfield-type-pos
))
1020 (if (and (looking-at c-symbol-key
) ; Can only be an integer type. :-)
1021 (not (looking-at c-not-primitive-type-keywords-regexp
))
1022 (not (c-punctuation-in (point) tok
)))
1023 (setq bitfield-type-pos
(point))
1024 (setq bitfield-size-pos nil
1025 bitfield-id-pos nil
)))))
1028 (unless (eq ignore-labels t
)
1029 (when (numberp c-maybe-labelp
)
1030 ;; `c-crosses-statement-barrier-p' has found a colon, so we
1031 ;; might be in a label now. Have we got a real label
1032 ;; (including a case label) or something like C++'s "public:"?
1033 ;; A case label might use an expression rather than a token.
1034 (setq after-case
:-pos
(or tok start
))
1035 (if (or (looking-at c-nonlabel-token-key
) ; e.g. "while" or "'a'"
1036 ;; Catch C++'s inheritance construct "class foo : bar".
1039 (c-safe (c-backward-sexp) t
)
1040 (looking-at c-nonlabel-token-2-key
))))
1041 (setq c-maybe-labelp nil
)
1042 (if after-labels-pos
; Have we already encountered a label?
1043 (if (not last-label-pos
)
1044 (setq last-label-pos
(or tok start
)))
1045 (setq after-labels-pos
(or tok start
)))
1046 (setq c-maybe-labelp t
1047 label-good-pos nil
))) ; bogus "label"
1049 (when (and (not label-good-pos
) ; i.e. no invalid "label"'s yet
1051 (looking-at c-nonlabel-token-key
)) ; e.g. "while :"
1052 ;; We're in a potential label and it's the first
1053 ;; time we've found something that isn't allowed in
1055 (setq label-good-pos
(or tok start
))))
1057 ;; We've moved back by a sexp, so update the token positions.
1062 pos tok
) ; always non-nil
1063 ) ; end of (catch loop ....)
1064 ) ; end of sexp-at-a-time (while ....)
1066 ;; If the stack isn't empty there might be errors to report.
1068 (if (and (vectorp saved-pos
) (eq (length saved-pos
) 3))
1069 (c-bos-report-error))
1070 (setq saved-pos
(cdr (car stack
))
1073 (when (and (eq ret
'same
)
1074 (not (memq sym
'(boundary ignore nil
))))
1075 ;; Need to investigate closer whether we've crossed
1076 ;; between a substatement and its containing statement.
1077 (if (setq saved
(if (looking-at c-block-stmt-1-key
)
1080 (cond ((> start saved
) (setq pos saved
))
1081 ((= start saved
) (setq ret
'up
)))))
1083 (when (and (not ignore-labels
)
1084 (eq c-maybe-labelp t
)
1085 (not (eq ret
'beginning
))
1087 (not bitfield-type-pos
) ; Bitfields take precedence over labels.
1088 (or (not label-good-pos
)
1089 (<= label-good-pos pos
)
1091 (goto-char (if (and last-label-pos
1092 (< last-label-pos start
))
1095 (looking-at c-label-kwds-regexp
))))
1096 ;; We're in a label. Maybe we should step to the statement
1098 (if (< after-labels-pos start
)
1099 (setq pos after-labels-pos
)
1101 (if (and last-label-pos
(< last-label-pos start
))
1102 ;; Might have jumped over several labels. Go to the last one.
1103 (setq pos last-label-pos
)))))
1105 ;; Have we got "case <expression>:"?
1107 (when (and after-case
:-pos
1108 (not (eq ret
'beginning
))
1109 (looking-at c-case-kwds-regexp
))
1110 (if (< after-case
:-pos start
)
1111 (setq pos after-case
:-pos
))
1115 ;; Skip over the unary operators that can start the statement.
1117 (c-backward-syntactic-ws)
1118 ;; protect AWK post-inc/decrement operators, etc.
1119 (and (not (c-at-vsemi-p (point)))
1120 (/= (skip-chars-backward "-+!*&~@`#") 0)))
1125 (defun c-punctuation-in (from to
)
1126 "Return non-nil if there is a non-comment non-macro punctuation character
1127 between FROM and TO. FROM must not be in a string or comment. The returned
1128 value is the position of the first such character."
1131 (let ((pos (point)))
1132 (while (progn (skip-chars-forward c-symbol-chars to
)
1133 (c-forward-syntactic-ws to
)
1135 (setq pos
(point))))
1136 (and (< (point) to
) (point))))
1138 (defun c-crosses-statement-barrier-p (from to
)
1139 "Return non-nil if buffer positions FROM to TO cross one or more
1140 statement or declaration boundaries. The returned value is actually
1141 the position of the earliest boundary char. FROM must not be within
1142 a string or comment.
1144 The variable `c-maybe-labelp' is set to the position of the first `:' that
1145 might start a label (i.e. not part of `::' and not preceded by `?'). If a
1146 single `?' is found, then `c-maybe-labelp' is cleared.
1148 For AWK, a statement which is terminated by an EOL (not a \; or a }) is
1149 regarded as having a \"virtual semicolon\" immediately after the last token on
1150 the line. If this virtual semicolon is _at_ from, the function recognizes it.
1152 Note that this function might do hidden buffer changes. See the
1153 comment at the start of cc-engine.el for more info."
1155 ;; If the current language has CPP macros, insert # into skip-chars.
1156 (if c-opt-cpp-symbol
1157 (concat (substring c-stmt-delim-chars
0 1) ; "^"
1158 c-opt-cpp-symbol
; usually "#"
1159 (substring c-stmt-delim-chars
1)) ; e.g. ";{}?:"
1160 c-stmt-delim-chars
))
1162 (append (substring skip-chars
1) nil
)) ; e.g. (?# ?\; ?{ ?} ?? ?:)
1163 lit-range vsemi-pos
)
1169 (while (progn (skip-chars-forward
1171 (min to
(c-point 'bonl
)))
1174 ;; Virtual semicolon?
1178 (if (setq lit-range
(c-literal-limits from
)) ; Have we landed in a string/comment?
1179 (goto-char (car lit-range
)))
1180 (c-backward-syntactic-ws) ; ? put a limit here, maybe?
1181 (setq vsemi-pos
(point))
1183 (throw 'done vsemi-pos
))
1184 ;; In a string/comment?
1185 ((setq lit-range
(c-literal-limits))
1186 (goto-char (cdr lit-range
)))
1187 ((eq (char-after) ?
:)
1189 (if (and (eq (char-after) ?
:)
1191 ;; Ignore scope operators.
1193 (setq c-maybe-labelp
(1- (point)))))
1194 ((eq (char-after) ??
)
1195 ;; A question mark. Can't be a label, so stop
1196 ;; looking for more : and ?.
1197 (setq c-maybe-labelp nil
1198 skip-chars
(substring c-stmt-delim-chars
0 -
2)))
1199 ;; At a CPP construct?
1200 ((and c-opt-cpp-symbol
(looking-at c-opt-cpp-symbol
)
1203 (looking-at c-opt-cpp-prefix
)))
1205 ((memq (char-after) non-skip-list
)
1206 (throw 'done
(point)))))
1207 ;; In trailing space after an as yet undetected virtual semicolon?
1208 (c-backward-syntactic-ws from
)
1209 (if (and (< (point) to
)
1214 (defun c-at-statement-start-p ()
1215 "Return non-nil if the point is at the first token in a statement
1216 or somewhere in the syntactic whitespace before it.
1218 A \"statement\" here is not restricted to those inside code blocks.
1219 Any kind of declaration-like construct that occur outside function
1220 bodies is also considered a \"statement\".
1222 Note that this function might do hidden buffer changes. See the
1223 comment at the start of cc-engine.el for more info."
1228 (c-syntactic-skip-backward (substring c-stmt-delim-chars
1) nil t
)
1230 (eq (char-before) ?
})
1231 (and (eq (char-before) ?
{)
1232 (not (and c-special-brace-lists
1233 (progn (backward-char)
1234 (c-looking-at-special-brace-list)))))
1235 (c-crosses-statement-barrier-p (point) end
)))))
1237 (defun c-at-expression-start-p ()
1238 "Return non-nil if the point is at the first token in an expression or
1239 statement, or somewhere in the syntactic whitespace before it.
1241 An \"expression\" here is a bit different from the normal language
1242 grammar sense: It's any sequence of expression tokens except commas,
1243 unless they are enclosed inside parentheses of some kind. Also, an
1244 expression never continues past an enclosing parenthesis, but it might
1245 contain parenthesis pairs of any sort except braces.
1247 Since expressions never cross statement boundaries, this function also
1248 recognizes statement beginnings, just like `c-at-statement-start-p'.
1250 Note that this function might do hidden buffer changes. See the
1251 comment at the start of cc-engine.el for more info."
1255 (c-stmt-delim-chars c-stmt-delim-chars-with-comma
)
1257 (c-syntactic-skip-backward (substring c-stmt-delim-chars
1) nil t
)
1259 (memq (char-before) '(?
{ ?
}))
1260 (save-excursion (backward-char)
1261 (looking-at "\\s("))
1262 (c-crosses-statement-barrier-p (point) end
)))))
1265 ;; A set of functions that covers various idiosyncrasies in
1266 ;; implementations of `forward-comment'.
1268 ;; Note: Some emacsen considers incorrectly that any line comment
1269 ;; ending with a backslash continues to the next line. I can't think
1270 ;; of any way to work around that in a reliable way without changing
1271 ;; the buffer, though. Suggestions welcome. ;) (No, temporarily
1272 ;; changing the syntax for backslash doesn't work since we must treat
1273 ;; escapes in string literals correctly.)
1275 (defun c-forward-single-comment ()
1276 "Move forward past whitespace and the closest following comment, if any.
1277 Return t if a comment was found, nil otherwise. In either case, the
1278 point is moved past the following whitespace. Line continuations,
1279 i.e. a backslashes followed by line breaks, are treated as whitespace.
1280 The line breaks that end line comments are considered to be the
1281 comment enders, so the point will be put on the beginning of the next
1282 line if it moved past a line comment.
1284 This function does not do any hidden buffer changes."
1286 (let ((start (point)))
1287 (when (looking-at "\\([ \t\n\r\f\v]\\|\\\\[\n\r]\\)+")
1288 (goto-char (match-end 0)))
1290 (when (forward-comment 1)
1292 ;; Some emacsen (e.g. XEmacs 21) return t when moving
1296 ;; Emacs includes the ending newline in a b-style (c++)
1297 ;; comment, but XEmacs doesn't. We depend on the Emacs
1298 ;; behavior (which also is symmetric).
1299 (if (and (eolp) (elt (parse-partial-sexp start
(point)) 7))
1300 (condition-case nil
(forward-char 1)))
1304 (defsubst c-forward-comments
()
1305 "Move forward past all following whitespace and comments.
1306 Line continuations, i.e. a backslashes followed by line breaks, are
1307 treated as whitespace.
1309 Note that this function might do hidden buffer changes. See the
1310 comment at the start of cc-engine.el for more info."
1313 ;; If forward-comment in at least XEmacs 21 is given a large
1314 ;; positive value, it'll loop all the way through if it hits
1316 (and (forward-comment 5)
1317 ;; Some emacsen (e.g. XEmacs 21) return t when moving
1321 (when (looking-at "\\\\[\n\r]")
1325 (defun c-backward-single-comment ()
1326 "Move backward past whitespace and the closest preceding comment, if any.
1327 Return t if a comment was found, nil otherwise. In either case, the
1328 point is moved past the preceding whitespace. Line continuations,
1329 i.e. a backslashes followed by line breaks, are treated as whitespace.
1330 The line breaks that end line comments are considered to be the
1331 comment enders, so the point cannot be at the end of the same line to
1332 move over a line comment.
1334 This function does not do any hidden buffer changes."
1336 (let ((start (point)))
1337 ;; When we got newline terminated comments, forward-comment in all
1338 ;; supported emacsen so far will stop at eol of each line not
1339 ;; ending with a comment when moving backwards. This corrects for
1340 ;; that, and at the same time handles line continuations.
1342 (skip-chars-backward " \t\n\r\f\v")
1343 (and (looking-at "[\n\r]")
1344 (eq (char-before) ?
\\)))
1348 ;; Some emacsen (e.g. Emacs 19.34) return t when moving
1349 ;; backwards at bob.
1352 ;; Leave point after the closest following newline if we've
1353 ;; backed up over any above, since forward-comment won't move
1354 ;; backward over a line comment if point is at the end of the
1356 (re-search-forward "\\=\\s *[\n\r]" start t
)
1358 (if (if (let (open-paren-in-column-0-is-defun-start) (forward-comment -
1))
1360 ;; If forward-comment above succeeded and we're at eol
1361 ;; then the newline we moved over above didn't end a
1362 ;; line comment, so we give it another go.
1363 (let (open-paren-in-column-0-is-defun-start)
1364 (forward-comment -
1))
1367 ;; Emacs <= 20 and XEmacs move back over the closer of a
1368 ;; block comment that lacks an opener.
1369 (if (looking-at "\\*/")
1370 (progn (forward-char 2) nil
)
1373 (defsubst c-backward-comments
()
1374 "Move backward past all preceding whitespace and comments.
1375 Line continuations, i.e. a backslashes followed by line breaks, are
1376 treated as whitespace. The line breaks that end line comments are
1377 considered to be the comment enders, so the point cannot be at the end
1378 of the same line to move over a line comment. Unlike
1379 c-backward-syntactic-ws, this function doesn't move back over
1380 preprocessor directives.
1382 Note that this function might do hidden buffer changes. See the
1383 comment at the start of cc-engine.el for more info."
1385 (let ((start (point)))
1387 ;; `forward-comment' in some emacsen (e.g. XEmacs 21.4)
1388 ;; return t when moving backwards at bob.
1391 (if (let (open-paren-in-column-0-is-defun-start)
1392 (forward-comment -
1))
1393 (if (looking-at "\\*/")
1394 ;; Emacs <= 20 and XEmacs move back over the
1395 ;; closer of a block comment that lacks an opener.
1396 (progn (forward-char 2) nil
)
1399 ;; XEmacs treats line continuations as whitespace but
1400 ;; only in the backward direction, which seems a bit
1401 ;; odd. Anyway, this is necessary for Emacs.
1402 (when (and (looking-at "[\n\r]")
1403 (eq (char-before) ?
\\)
1409 ;; Tools for skipping over syntactic whitespace.
1411 ;; The following functions use text properties to cache searches over
1412 ;; large regions of syntactic whitespace. It works as follows:
1414 ;; o If a syntactic whitespace region contains anything but simple
1415 ;; whitespace (i.e. space, tab and line breaks), the text property
1416 ;; `c-in-sws' is put over it. At places where we have stopped
1417 ;; within that region there's also a `c-is-sws' text property.
1418 ;; That since there typically are nested whitespace inside that
1419 ;; must be handled separately, e.g. whitespace inside a comment or
1420 ;; cpp directive. Thus, from one point with `c-is-sws' it's safe
1421 ;; to jump to another point with that property within the same
1422 ;; `c-in-sws' region. It can be likened to a ladder where
1423 ;; `c-in-sws' marks the bars and `c-is-sws' the rungs.
1425 ;; o The `c-is-sws' property is put on the simple whitespace chars at
1426 ;; a "rung position" and also maybe on the first following char.
1427 ;; As many characters as can be conveniently found in this range
1428 ;; are marked, but no assumption can be made that the whole range
1429 ;; is marked (it could be clobbered by later changes, for
1432 ;; Note that some part of the beginning of a sequence of simple
1433 ;; whitespace might be part of the end of a preceding line comment
1434 ;; or cpp directive and must not be considered part of the "rung".
1435 ;; Such whitespace is some amount of horizontal whitespace followed
1436 ;; by a newline. In the case of cpp directives it could also be
1437 ;; two newlines with horizontal whitespace between them.
1439 ;; The reason to include the first following char is to cope with
1440 ;; "rung positions" that doesn't have any ordinary whitespace. If
1441 ;; `c-is-sws' is put on a token character it does not have
1442 ;; `c-in-sws' set simultaneously. That's the only case when that
1443 ;; can occur, and the reason for not extending the `c-in-sws'
1444 ;; region to cover it is that the `c-in-sws' region could then be
1445 ;; accidentally merged with a following one if the token is only
1446 ;; one character long.
1448 ;; o On buffer changes the `c-in-sws' and `c-is-sws' properties are
1449 ;; removed in the changed region. If the change was inside
1450 ;; syntactic whitespace that means that the "ladder" is broken, but
1451 ;; a later call to `c-forward-sws' or `c-backward-sws' will use the
1452 ;; parts on either side and use an ordinary search only to "repair"
1455 ;; Special care needs to be taken if a region is removed: If there
1456 ;; are `c-in-sws' on both sides of it which do not connect inside
1457 ;; the region then they can't be joined. If e.g. a marked macro is
1458 ;; broken, syntactic whitespace inside the new text might be
1459 ;; marked. If those marks would become connected with the old
1460 ;; `c-in-sws' range around the macro then we could get a ladder
1461 ;; with one end outside the macro and the other at some whitespace
1464 ;; The main motivation for this system is to increase the speed in
1465 ;; skipping over the large whitespace regions that can occur at the
1466 ;; top level in e.g. header files that contain a lot of comments and
1467 ;; cpp directives. For small comments inside code it's probably
1468 ;; slower than using `forward-comment' straightforwardly, but speed is
1469 ;; not a significant factor there anyway.
1471 ; (defface c-debug-is-sws-face
1472 ; '((t (:background "GreenYellow")))
1473 ; "Debug face to mark the `c-is-sws' property.")
1474 ; (defface c-debug-in-sws-face
1475 ; '((t (:underline t)))
1476 ; "Debug face to mark the `c-in-sws' property.")
1478 ; (defun c-debug-put-sws-faces ()
1479 ; ;; Put the sws debug faces on all the `c-is-sws' and `c-in-sws'
1480 ; ;; properties in the buffer.
1483 ; (c-save-buffer-state (in-face)
1484 ; (goto-char (point-min))
1485 ; (setq in-face (if (get-text-property (point) 'c-is-sws)
1488 ; (goto-char (next-single-property-change
1489 ; (point) 'c-is-sws nil (point-max)))
1492 ; (c-debug-add-face in-face (point) 'c-debug-is-sws-face)
1493 ; (setq in-face nil))
1494 ; (setq in-face (point)))
1496 ; (goto-char (point-min))
1497 ; (setq in-face (if (get-text-property (point) 'c-in-sws)
1500 ; (goto-char (next-single-property-change
1501 ; (point) 'c-in-sws nil (point-max)))
1504 ; (c-debug-add-face in-face (point) 'c-debug-in-sws-face)
1505 ; (setq in-face nil))
1506 ; (setq in-face (point)))
1509 (defmacro c-debug-sws-msg
(&rest args
)
1513 (defmacro c-put-is-sws
(beg end
)
1514 ;; This macro does a hidden buffer change.
1515 `(let ((beg ,beg
) (end ,end
))
1516 (put-text-property beg end
'c-is-sws t
)
1517 ,@(when (facep 'c-debug-is-sws-face
)
1518 `((c-debug-add-face beg end
'c-debug-is-sws-face
)))))
1520 (defmacro c-put-in-sws
(beg end
)
1521 ;; This macro does a hidden buffer change.
1522 `(let ((beg ,beg
) (end ,end
))
1523 (put-text-property beg end
'c-in-sws t
)
1524 ,@(when (facep 'c-debug-is-sws-face
)
1525 `((c-debug-add-face beg end
'c-debug-in-sws-face
)))))
1527 (defmacro c-remove-is-sws
(beg end
)
1528 ;; This macro does a hidden buffer change.
1529 `(let ((beg ,beg
) (end ,end
))
1530 (remove-text-properties beg end
'(c-is-sws nil
))
1531 ,@(when (facep 'c-debug-is-sws-face
)
1532 `((c-debug-remove-face beg end
'c-debug-is-sws-face
)))))
1534 (defmacro c-remove-in-sws
(beg end
)
1535 ;; This macro does a hidden buffer change.
1536 `(let ((beg ,beg
) (end ,end
))
1537 (remove-text-properties beg end
'(c-in-sws nil
))
1538 ,@(when (facep 'c-debug-is-sws-face
)
1539 `((c-debug-remove-face beg end
'c-debug-in-sws-face
)))))
1541 (defmacro c-remove-is-and-in-sws
(beg end
)
1542 ;; This macro does a hidden buffer change.
1543 `(let ((beg ,beg
) (end ,end
))
1544 (remove-text-properties beg end
'(c-is-sws nil c-in-sws nil
))
1545 ,@(when (facep 'c-debug-is-sws-face
)
1546 `((c-debug-remove-face beg end
'c-debug-is-sws-face
)
1547 (c-debug-remove-face beg end
'c-debug-in-sws-face
)))))
1549 (defsubst c-invalidate-sws-region-after
(beg end
)
1550 ;; Called from `after-change-functions'. Note that if
1551 ;; `c-forward-sws' or `c-backward-sws' are used outside
1552 ;; `c-save-buffer-state' or similar then this will remove the cache
1553 ;; properties right after they're added.
1555 ;; This function does hidden buffer changes.
1558 ;; Adjust the end to remove the properties in any following simple
1559 ;; ws up to and including the next line break, if there is any
1560 ;; after the changed region. This is necessary e.g. when a rung
1561 ;; marked empty line is converted to a line comment by inserting
1562 ;; "//" before the line break. In that case the line break would
1563 ;; keep the rung mark which could make a later `c-backward-sws'
1564 ;; move into the line comment instead of over it.
1566 (skip-chars-forward " \t\f\v")
1567 (when (and (eolp) (not (eobp)))
1568 (setq end
(1+ (point)))))
1570 (when (and (= beg end
)
1571 (get-text-property beg
'c-in-sws
)
1573 (get-text-property (1- beg
) 'c-in-sws
))
1574 ;; Ensure that an `c-in-sws' range gets broken. Note that it isn't
1575 ;; safe to keep a range that was continuous before the change. E.g:
1581 ;; There can be a "ladder" between "#" and "b". Now, if the newline
1582 ;; after "foo" is removed then "bar" will become part of the cpp
1583 ;; directive instead of a syntactically relevant token. In that
1584 ;; case there's no longer syntactic ws from "#" to "b".
1585 (setq beg
(1- beg
)))
1587 (c-debug-sws-msg "c-invalidate-sws-region-after [%s..%s]" beg end
)
1588 (c-remove-is-and-in-sws beg end
))
1590 (defun c-forward-sws ()
1591 ;; Used by `c-forward-syntactic-ws' to implement the unbounded search.
1593 ;; This function might do hidden buffer changes.
1595 (let (;; `rung-pos' is set to a position as early as possible in the
1596 ;; unmarked part of the simple ws region.
1597 (rung-pos (point)) next-rung-pos rung-end-pos last-put-in-sws-pos
1598 rung-is-marked next-rung-is-marked simple-ws-end
1599 ;; `safe-start' is set when it's safe to cache the start position.
1600 ;; It's not set if we've initially skipped over comments and line
1601 ;; continuations since we might have gone out through the end of a
1602 ;; macro then. This provision makes `c-forward-sws' not populate the
1603 ;; cache in the majority of cases, but otoh is `c-backward-sws' by far
1607 ;; Skip simple ws and do a quick check on the following character to see
1608 ;; if it's anything that can't start syntactic ws, so we can bail out
1609 ;; early in the majority of cases when there just are a few ws chars.
1610 (skip-chars-forward " \t\n\r\f\v")
1611 (when (looking-at c-syntactic-ws-start
)
1613 (setq rung-end-pos
(min (1+ (point)) (point-max)))
1614 (if (setq rung-is-marked
(text-property-any rung-pos rung-end-pos
1616 ;; Find the last rung position to avoid setting properties in all
1617 ;; the cases when the marked rung is complete.
1618 ;; (`next-single-property-change' is certain to move at least one
1620 (setq rung-pos
(1- (next-single-property-change
1621 rung-is-marked
'c-is-sws nil rung-end-pos
)))
1622 ;; Got no marked rung here. Since the simple ws might have started
1623 ;; inside a line comment or cpp directive we must set `rung-pos' as
1624 ;; high as possible.
1625 (setq rung-pos
(point)))
1630 (when (and rung-is-marked
1631 (get-text-property (point) 'c-in-sws
))
1633 ;; The following search is the main reason that `c-in-sws'
1634 ;; and `c-is-sws' aren't combined to one property.
1635 (goto-char (next-single-property-change
1636 (point) 'c-in-sws nil
(point-max)))
1637 (unless (get-text-property (point) 'c-is-sws
)
1638 ;; If the `c-in-sws' region extended past the last
1639 ;; `c-is-sws' char we have to go back a bit.
1640 (or (get-text-property (1- (point)) 'c-is-sws
)
1641 (goto-char (previous-single-property-change
1642 (point) 'c-is-sws
)))
1646 "c-forward-sws cached move %s -> %s (max %s)"
1647 rung-pos
(point) (point-max))
1649 (setq rung-pos
(point))
1650 (and (> (skip-chars-forward " \t\n\r\f\v") 0)
1653 ;; We'll loop here if there is simple ws after the last rung.
1654 ;; That means that there's been some change in it and it's
1655 ;; possible that we've stepped into another ladder, so extend
1656 ;; the previous one to join with it if there is one, and try to
1657 ;; use the cache again.
1659 "c-forward-sws extending rung with [%s..%s] (max %s)"
1660 (1+ rung-pos
) (1+ (point)) (point-max))
1661 (unless (get-text-property (point) 'c-is-sws
)
1662 ;; Remove any `c-in-sws' property from the last char of
1663 ;; the rung before we mark it with `c-is-sws', so that we
1664 ;; won't connect with the remains of a broken "ladder".
1665 (c-remove-in-sws (point) (1+ (point))))
1666 (c-put-is-sws (1+ rung-pos
)
1668 (c-put-in-sws rung-pos
1669 (setq rung-pos
(point)
1670 last-put-in-sws-pos rung-pos
)))
1672 (setq simple-ws-end
(point))
1673 (c-forward-comments)
1676 ((/= (point) simple-ws-end
)
1677 ;; Skipped over comments. Don't cache at eob in case the buffer
1682 (and c-opt-cpp-prefix
1683 (looking-at c-opt-cpp-start
)
1684 (progn (skip-chars-backward " \t")
1687 (progn (backward-char)
1688 (not (eq (char-before) ?
\\))))))
1689 ;; Skip a preprocessor directive.
1691 (while (and (eq (char-before) ?
\\)
1692 (= (forward-line 1) 0))
1696 ;; Don't cache at eob in case the buffer is narrowed.
1699 ;; We've searched over a piece of non-white syntactic ws. See if this
1701 (setq next-rung-pos
(point))
1702 (skip-chars-forward " \t\n\r\f\v")
1703 (setq rung-end-pos
(min (1+ (point)) (point-max)))
1706 ;; Cache if we haven't skipped comments only, and if we started
1707 ;; either from a marked rung or from a completely uncached
1711 (not (get-text-property simple-ws-end
'c-in-sws
))))
1713 ;; See if there's a marked rung in the encountered simple ws. If
1714 ;; so then we can cache, unless `safe-start' is nil. Even then
1715 ;; we need to do this to check if the cache can be used for the
1717 (and (setq next-rung-is-marked
1718 (text-property-any next-rung-pos rung-end-pos
1724 "c-forward-sws caching [%s..%s] - [%s..%s] (max %s)"
1725 rung-pos
(1+ simple-ws-end
) next-rung-pos rung-end-pos
1728 ;; Remove the properties for any nested ws that might be cached.
1729 ;; Only necessary for `c-is-sws' since `c-in-sws' will be set
1731 (c-remove-is-sws (1+ simple-ws-end
) next-rung-pos
)
1732 (unless (and rung-is-marked
(= rung-pos simple-ws-end
))
1733 (c-put-is-sws rung-pos
1735 (setq rung-is-marked t
))
1736 (c-put-in-sws rung-pos
1737 (setq rung-pos
(point)
1738 last-put-in-sws-pos rung-pos
))
1739 (unless (get-text-property (1- rung-end-pos
) '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 (1- rung-end-pos
) rung-end-pos
))
1744 (c-put-is-sws next-rung-pos
1748 "c-forward-sws not caching [%s..%s] - [%s..%s] (max %s)"
1749 rung-pos
(1+ simple-ws-end
) next-rung-pos rung-end-pos
1752 ;; Set `rung-pos' for the next rung. It's the same thing here as
1753 ;; initially, except that the rung position is set as early as
1754 ;; possible since we can't be in the ending ws of a line comment or
1755 ;; cpp directive now.
1756 (if (setq rung-is-marked next-rung-is-marked
)
1757 (setq rung-pos
(1- (next-single-property-change
1758 rung-is-marked
'c-is-sws nil rung-end-pos
)))
1759 (setq rung-pos next-rung-pos
))
1760 (setq safe-start t
)))
1762 ;; Make sure that the newly marked `c-in-sws' region doesn't connect to
1763 ;; another one after the point (which might occur when editing inside a
1764 ;; comment or macro).
1765 (when (eq last-put-in-sws-pos
(point))
1766 (cond ((< last-put-in-sws-pos
(point-max))
1768 "c-forward-sws clearing at %s for cache separation"
1769 last-put-in-sws-pos
)
1770 (c-remove-in-sws last-put-in-sws-pos
1771 (1+ last-put-in-sws-pos
)))
1773 ;; If at eob we have to clear the last character before the end
1774 ;; instead since the buffer might be narrowed and there might
1775 ;; be a `c-in-sws' after (point-max). In this case it's
1776 ;; necessary to clear both properties.
1778 "c-forward-sws clearing thoroughly at %s for cache separation"
1779 (1- last-put-in-sws-pos
))
1780 (c-remove-is-and-in-sws (1- last-put-in-sws-pos
)
1781 last-put-in-sws-pos
))))
1784 (defun c-backward-sws ()
1785 ;; Used by `c-backward-syntactic-ws' to implement the unbounded search.
1787 ;; This function might do hidden buffer changes.
1789 (let (;; `rung-pos' is set to a position as late as possible in the unmarked
1790 ;; part of the simple ws region.
1791 (rung-pos (point)) next-rung-pos last-put-in-sws-pos
1792 rung-is-marked simple-ws-beg cmt-skip-pos
)
1794 ;; Skip simple horizontal ws and do a quick check on the preceding
1795 ;; character to see if it's anything that can't end syntactic ws, so we can
1796 ;; bail out early in the majority of cases when there just are a few ws
1797 ;; chars. Newlines are complicated in the backward direction, so we can't
1799 (skip-chars-backward " \t\f")
1800 (when (and (not (bobp))
1803 (looking-at c-syntactic-ws-end
)))
1805 ;; Try to find a rung position in the simple ws preceding point, so that
1806 ;; we can get a cache hit even if the last bit of the simple ws has
1807 ;; changed recently.
1808 (setq simple-ws-beg
(point))
1809 (skip-chars-backward " \t\n\r\f\v")
1810 (if (setq rung-is-marked
(text-property-any
1811 (point) (min (1+ rung-pos
) (point-max))
1813 ;; `rung-pos' will be the earliest marked position, which means that
1814 ;; there might be later unmarked parts in the simple ws region.
1815 ;; It's not worth the effort to fix that; the last part of the
1816 ;; simple ws is also typically edited often, so it could be wasted.
1817 (goto-char (setq rung-pos rung-is-marked
))
1818 (goto-char simple-ws-beg
))
1823 (when (and rung-is-marked
1825 (get-text-property (1- (point)) 'c-in-sws
))
1827 ;; The following search is the main reason that `c-in-sws'
1828 ;; and `c-is-sws' aren't combined to one property.
1829 (goto-char (previous-single-property-change
1830 (point) 'c-in-sws nil
(point-min)))
1831 (unless (get-text-property (point) 'c-is-sws
)
1832 ;; If the `c-in-sws' region extended past the first
1833 ;; `c-is-sws' char we have to go forward a bit.
1834 (goto-char (next-single-property-change
1835 (point) 'c-is-sws
)))
1838 "c-backward-sws cached move %s <- %s (min %s)"
1839 (point) rung-pos
(point-min))
1841 (setq rung-pos
(point))
1842 (if (and (< (min (skip-chars-backward " \t\f\v")
1844 (setq simple-ws-beg
(point))
1845 (skip-chars-backward " \t\n\r\f\v")))
1847 (setq rung-is-marked
1848 (text-property-any (point) rung-pos
1851 (goto-char simple-ws-beg
)
1854 ;; We'll loop here if there is simple ws before the first rung.
1855 ;; That means that there's been some change in it and it's
1856 ;; possible that we've stepped into another ladder, so extend
1857 ;; the previous one to join with it if there is one, and try to
1858 ;; use the cache again.
1860 "c-backward-sws extending rung with [%s..%s] (min %s)"
1861 rung-is-marked rung-pos
(point-min))
1862 (unless (get-text-property (1- rung-pos
) 'c-is-sws
)
1863 ;; Remove any `c-in-sws' property from the last char of
1864 ;; the rung before we mark it with `c-is-sws', so that we
1865 ;; won't connect with the remains of a broken "ladder".
1866 (c-remove-in-sws (1- rung-pos
) rung-pos
))
1867 (c-put-is-sws rung-is-marked
1869 (c-put-in-sws rung-is-marked
1871 (setq rung-pos rung-is-marked
1872 last-put-in-sws-pos rung-pos
))
1874 (c-backward-comments)
1875 (setq cmt-skip-pos
(point))
1878 ((and c-opt-cpp-prefix
1879 (/= cmt-skip-pos simple-ws-beg
)
1880 (c-beginning-of-macro))
1881 ;; Inside a cpp directive. See if it should be skipped over.
1882 (let ((cpp-beg (point)))
1884 ;; Move back over all line continuations in the region skipped
1885 ;; over by `c-backward-comments'. If we go past it then we
1886 ;; started inside the cpp directive.
1887 (goto-char simple-ws-beg
)
1889 (while (and (> (point) cmt-skip-pos
)
1890 (progn (backward-char)
1891 (eq (char-before) ?
\\)))
1892 (beginning-of-line))
1894 (if (< (point) cmt-skip-pos
)
1895 ;; Don't move past the cpp directive if we began inside
1896 ;; it. Note that the position at the end of the last line
1897 ;; of the macro is also considered to be within it.
1898 (progn (goto-char cmt-skip-pos
)
1901 ;; It's worthwhile to spend a little bit of effort on finding
1902 ;; the end of the macro, to get a good `simple-ws-beg'
1903 ;; position for the cache. Note that `c-backward-comments'
1904 ;; could have stepped over some comments before going into
1905 ;; the macro, and then `simple-ws-beg' must be kept on the
1906 ;; same side of those comments.
1907 (goto-char simple-ws-beg
)
1908 (skip-chars-backward " \t\n\r\f\v")
1909 (if (eq (char-before) ?
\\)
1912 (if (< (point) simple-ws-beg
)
1913 ;; Might happen if comments after the macro were skipped
1915 (setq simple-ws-beg
(point)))
1920 ((/= (save-excursion
1921 (skip-chars-forward " \t\n\r\f\v" simple-ws-beg
)
1922 (setq next-rung-pos
(point)))
1924 ;; Skipped over comments. Must put point at the end of
1925 ;; the simple ws at point since we might be after a line
1926 ;; comment or cpp directive that's been partially
1927 ;; narrowed out, and we can't risk marking the simple ws
1928 ;; at the end of it.
1929 (goto-char next-rung-pos
)
1932 ;; We've searched over a piece of non-white syntactic ws. See if this
1934 (setq next-rung-pos
(point))
1935 (skip-chars-backward " \t\f\v")
1938 ;; Cache if we started either from a marked rung or from a
1939 ;; completely uncached position.
1941 (not (get-text-property (1- simple-ws-beg
) 'c-in-sws
))
1943 ;; Cache if there's a marked rung in the encountered simple ws.
1945 (skip-chars-backward " \t\n\r\f\v")
1946 (text-property-any (point) (min (1+ next-rung-pos
) (point-max))
1951 "c-backward-sws caching [%s..%s] - [%s..%s] (min %s)"
1952 (point) (1+ next-rung-pos
)
1953 simple-ws-beg
(min (1+ rung-pos
) (point-max))
1956 ;; Remove the properties for any nested ws that might be cached.
1957 ;; Only necessary for `c-is-sws' since `c-in-sws' will be set
1959 (c-remove-is-sws (1+ next-rung-pos
) simple-ws-beg
)
1960 (unless (and rung-is-marked
(= simple-ws-beg rung-pos
))
1961 (let ((rung-end-pos (min (1+ rung-pos
) (point-max))))
1962 (unless (get-text-property (1- rung-end-pos
) 'c-is-sws
)
1963 ;; Remove any `c-in-sws' property from the last char of
1964 ;; the rung before we mark it with `c-is-sws', so that we
1965 ;; won't connect with the remains of a broken "ladder".
1966 (c-remove-in-sws (1- rung-end-pos
) rung-end-pos
))
1967 (c-put-is-sws simple-ws-beg
1969 (setq rung-is-marked t
)))
1970 (c-put-in-sws (setq simple-ws-beg
(point)
1971 last-put-in-sws-pos simple-ws-beg
)
1973 (c-put-is-sws (setq rung-pos simple-ws-beg
)
1974 (1+ next-rung-pos
)))
1977 "c-backward-sws not caching [%s..%s] - [%s..%s] (min %s)"
1978 (point) (1+ next-rung-pos
)
1979 simple-ws-beg
(min (1+ rung-pos
) (point-max))
1981 (setq rung-pos next-rung-pos
1982 simple-ws-beg
(point))
1985 ;; Make sure that the newly marked `c-in-sws' region doesn't connect to
1986 ;; another one before the point (which might occur when editing inside a
1987 ;; comment or macro).
1988 (when (eq last-put-in-sws-pos
(point))
1989 (cond ((< (point-min) last-put-in-sws-pos
)
1991 "c-backward-sws clearing at %s for cache separation"
1992 (1- last-put-in-sws-pos
))
1993 (c-remove-in-sws (1- last-put-in-sws-pos
)
1994 last-put-in-sws-pos
))
1996 ;; If at bob and the buffer is narrowed, we have to clear the
1997 ;; character we're standing on instead since there might be a
1998 ;; `c-in-sws' before (point-min). In this case it's necessary
1999 ;; to clear both properties.
2001 "c-backward-sws clearing thoroughly at %s for cache separation"
2002 last-put-in-sws-pos
)
2003 (c-remove-is-and-in-sws last-put-in-sws-pos
2004 (1+ last-put-in-sws-pos
)))))
2008 ;; Other whitespace tools
2009 (defun c-partial-ws-p (beg end
)
2010 ;; Is the region (beg end) WS, and is there WS (or BOB/EOB) next to the
2011 ;; region? This is a "heuristic" function. .....
2013 ;; The motivation for the second bit is to check whether removing this
2014 ;; region would coalesce two symbols.
2016 ;; FIXME!!! This function doesn't check virtual semicolons in any way. Be
2017 ;; careful about using this function for, e.g. AWK. (2007/3/7)
2019 (let ((end+1 (min (1+ end
) (point-max))))
2020 (or (progn (goto-char (max (point-min) (1- beg
)))
2021 (c-skip-ws-forward end
)
2023 (progn (goto-char beg
)
2024 (c-skip-ws-forward end
+1)
2025 (eq (point) end
+1))))))
2027 ;; A system for finding noteworthy parens before the point.
2029 (defconst c-state-cache-too-far
5000)
2030 ;; A maximum comfortable scanning distance, e.g. between
2031 ;; `c-state-cache-good-pos' and "HERE" (where we call c-parse-state). When
2032 ;; this distance is exceeded, we take "emergency measures", e.g. by clearing
2033 ;; the cache and starting again from point-min or a beginning of defun. This
2034 ;; value can be tuned for efficiency or set to a lower value for testing.
2036 (defvar c-state-cache nil
)
2037 (make-variable-buffer-local 'c-state-cache
)
2038 ;; The state cache used by `c-parse-state' to cut down the amount of
2039 ;; searching. It's the result from some earlier `c-parse-state' call. See
2040 ;; `c-parse-state''s doc string for details of its structure.
2042 ;; The use of the cached info is more effective if the next
2043 ;; `c-parse-state' call is on a line close by the one the cached state
2044 ;; was made at; the cache can actually slow down a little if the
2045 ;; cached state was made very far back in the buffer. The cache is
2046 ;; most effective if `c-parse-state' is used on each line while moving
2049 (defvar c-state-cache-good-pos
1)
2050 (make-variable-buffer-local 'c-state-cache-good-pos
)
2051 ;; This is a position where `c-state-cache' is known to be correct, or
2052 ;; nil (see below). It's a position inside one of the recorded unclosed
2053 ;; parens or the top level, but not further nested inside any literal or
2054 ;; subparen that is closed before the last recorded position.
2056 ;; The exact position is chosen to try to be close to yet earlier than
2057 ;; the position where `c-state-cache' will be called next. Right now
2058 ;; the heuristic is to set it to the position after the last found
2059 ;; closing paren (of any type) before the line on which
2060 ;; `c-parse-state' was called. That is chosen primarily to work well
2061 ;; with refontification of the current line.
2063 ;; 2009-07-28: When `c-state-point-min' and the last position where
2064 ;; `c-parse-state' or for which `c-invalidate-state-cache' was called, are
2065 ;; both in the same literal, there is no such "good position", and
2066 ;; c-state-cache-good-pos is then nil. This is the ONLY circumstance in which
2067 ;; it can be nil. In this case, `c-state-point-min-literal' will be non-nil.
2069 ;; 2009-06-12: In a brace desert, c-state-cache-good-pos may also be in
2070 ;; the middle of the desert, as long as it is not within a brace pair
2071 ;; recorded in `c-state-cache' or a paren/bracket pair.
2074 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2075 ;; We maintain a simple cache of positions which aren't in a literal, so as to
2076 ;; speed up testing for non-literality.
2077 (defconst c-state-nonlit-pos-interval
10000)
2078 ;; The approximate interval between entries in `c-state-nonlit-pos-cache'.
2080 (defvar c-state-nonlit-pos-cache nil
)
2081 (make-variable-buffer-local 'c-state-nonlit-pos-cache
)
2082 ;; A list of buffer positions which are known not to be in a literal or a cpp
2083 ;; construct. This is ordered with higher positions at the front of the list.
2084 ;; Only those which are less than `c-state-nonlit-pos-cache-limit' are valid.
2086 (defvar c-state-nonlit-pos-cache-limit
1)
2087 (make-variable-buffer-local 'c-state-nonlit-pos-cache-limit
)
2088 ;; An upper limit on valid entries in `c-state-nonlit-pos-cache'. This is
2089 ;; reduced by buffer changes, and increased by invocations of
2090 ;; `c-state-literal-at'.
2092 (defsubst c-state-pp-to-literal
(from to
)
2093 ;; Do a parse-partial-sexp from FROM to TO, returning either
2094 ;; (STATE TYPE (BEG . END)) if TO is in a literal; or
2095 ;; (STATE) otherwise,
2096 ;; where STATE is the parsing state at TO, TYPE is the type of the literal
2097 ;; (one of 'c, 'c++, 'string) and (BEG . END) is the boundaries of the literal.
2099 ;; Only elements 3 (in a string), 4 (in a comment), 5 (following a quote),
2100 ;; 7 (comment type) and 8 (start of comment/string) (and possibly 9) of
2103 (let ((s (parse-partial-sexp from to
))
2105 (when (or (nth 3 s
) (nth 4 s
)) ; in a string or comment
2108 ((eq (nth 7 s
) t
) 'c
++)
2110 (parse-partial-sexp (point) (point-max)
2114 'syntax-table
)) ; stop at end of literal
2116 `(,s
,ty
(,(nth 8 s
) .
,(point)))
2119 (defun c-state-safe-place (here)
2120 ;; Return a buffer position before HERE which is "safe", i.e. outside any
2121 ;; string, comment, or macro.
2123 ;; NOTE: This function manipulates `c-state-nonlit-pos-cache'. This cache
2124 ;; MAY NOT contain any positions within macros, since macros are frequently
2125 ;; turned into comments by use of the `c-cpp-delimiter' category properties.
2126 ;; We cannot rely on this mechanism whilst determining a cache pos since
2127 ;; this function is also called from outwith `c-parse-state'.
2131 (let ((c c-state-nonlit-pos-cache
)
2133 ;; Trim the cache to take account of buffer changes.
2134 (while (and c
(> (car c
) c-state-nonlit-pos-cache-limit
))
2136 (setq c-state-nonlit-pos-cache c
)
2138 (while (and c
(> (car c
) here
))
2140 (setq pos
(or (car c
) (point-min)))
2142 (while (<= (setq npos
(+ pos c-state-nonlit-pos-interval
))
2144 (setq lit
(car (cddr (c-state-pp-to-literal pos npos
))))
2145 (setq pos
(or (cdr lit
) npos
)) ; end of literal containing npos.
2147 (when (and (c-beginning-of-macro) (/= (point) pos
))
2148 (c-syntactic-end-of-macro)
2149 (or (eobp) (forward-char))
2151 (setq c-state-nonlit-pos-cache
(cons pos c-state-nonlit-pos-cache
)))
2153 (if (> pos c-state-nonlit-pos-cache-limit
)
2154 (setq c-state-nonlit-pos-cache-limit pos
))
2157 (defun c-state-literal-at (here)
2158 ;; If position HERE is inside a literal, return (START . END), the
2159 ;; boundaries of the literal (which may be outside the accessible bit of the
2160 ;; buffer). Otherwise, return nil.
2162 ;; This function is almost the same as `c-literal-limits'. Previously, it
2163 ;; differed in that it was a lower level function, and that it rigorously
2164 ;; followed the syntax from BOB. `c-literal-limits' is now (2011-12)
2165 ;; virtually identical to this function.
2169 (let ((pos (c-state-safe-place here
)))
2170 (car (cddr (c-state-pp-to-literal pos here
)))))))
2172 (defsubst c-state-lit-beg
(pos)
2173 ;; Return the start of the literal containing POS, or POS itself.
2174 (or (car (c-state-literal-at pos
))
2177 (defsubst c-state-cache-non-literal-place
(pos state
)
2178 ;; Return a position outside of a string/comment/macro at or before POS.
2179 ;; STATE is the parse-partial-sexp state at POS.
2180 (let ((res (if (or (nth 3 state
) ; in a string?
2181 (nth 4 state
)) ; in a comment?
2186 (if (c-beginning-of-macro)
2190 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2191 ;; Stuff to do with point-min, and coping with any literal there.
2192 (defvar c-state-point-min
1)
2193 (make-variable-buffer-local 'c-state-point-min
)
2194 ;; This is (point-min) when `c-state-cache' was last calculated. A change of
2195 ;; narrowing is likely to affect the parens that are visible before the point.
2197 (defvar c-state-point-min-lit-type nil
)
2198 (make-variable-buffer-local 'c-state-point-min-lit-type
)
2199 (defvar c-state-point-min-lit-start nil
)
2200 (make-variable-buffer-local 'c-state-point-min-lit-start
)
2201 ;; These two variables define the literal, if any, containing point-min.
2202 ;; Their values are, respectively, 'string, c, or c++, and the start of the
2203 ;; literal. If there's no literal there, they're both nil.
2205 (defvar c-state-min-scan-pos
1)
2206 (make-variable-buffer-local 'c-state-min-scan-pos
)
2207 ;; This is the earliest buffer-pos from which scanning can be done. It is
2208 ;; either the end of the literal containing point-min, or point-min itself.
2209 ;; It becomes nil if the buffer is changed earlier than this point.
2210 (defun c-state-get-min-scan-pos ()
2211 ;; Return the lowest valid scanning pos. This will be the end of the
2212 ;; literal enclosing point-min, or point-min itself.
2213 (or c-state-min-scan-pos
2217 (goto-char c-state-point-min-lit-start
)
2218 (if (eq c-state-point-min-lit-type
'string
)
2220 (forward-comment 1))
2221 (setq c-state-min-scan-pos
(point))))))
2223 (defun c-state-mark-point-min-literal ()
2224 ;; Determine the properties of any literal containing POINT-MIN, setting the
2225 ;; variables `c-state-point-min-lit-type', `c-state-point-min-lit-start',
2226 ;; and `c-state-min-scan-pos' accordingly. The return value is meaningless.
2227 (let ((p-min (point-min))
2231 (setq lit
(c-state-literal-at p-min
))
2233 (setq c-state-point-min-lit-type
2235 (goto-char (car lit
))
2237 ((looking-at c-block-comment-start-regexp
) 'c
)
2238 ((looking-at c-line-comment-starter
) 'c
++)
2240 c-state-point-min-lit-start
(car lit
)
2241 c-state-min-scan-pos
(cdr lit
))
2242 (setq c-state-point-min-lit-type nil
2243 c-state-point-min-lit-start nil
2244 c-state-min-scan-pos p-min
)))))
2247 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2248 ;; A variable which signals a brace dessert - helpful for reducing the number
2249 ;; of fruitless backward scans.
2250 (defvar c-state-brace-pair-desert nil
)
2251 (make-variable-buffer-local 'c-state-brace-pair-desert
)
2252 ;; Used only in `c-append-lower-brace-pair-to-state-cache'. It is set when
2253 ;; that defun has searched backwards for a brace pair and not found one. Its
2254 ;; value is either nil or a cons (PA . FROM), where PA is the position of the
2255 ;; enclosing opening paren/brace/bracket which bounds the backwards search (or
2256 ;; nil when at top level) and FROM is where the backward search started. It
2257 ;; is reset to nil in `c-invalidate-state-cache'.
2260 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2261 ;; Lowish level functions/macros which work directly on `c-state-cache', or a
2262 ;; list of like structure.
2263 (defmacro c-state-cache-top-lparen
(&optional cache
)
2264 ;; Return the address of the top left brace/bracket/paren recorded in CACHE
2265 ;; (default `c-state-cache') (or nil).
2266 (let ((cash (or cache
'c-state-cache
)))
2267 `(if (consp (car ,cash
))
2271 (defmacro c-state-cache-top-paren
(&optional cache
)
2272 ;; Return the address of the latest brace/bracket/paren (whether left or
2273 ;; right) recorded in CACHE (default `c-state-cache') or nil.
2274 (let ((cash (or cache
'c-state-cache
)))
2275 `(if (consp (car ,cash
))
2279 (defmacro c-state-cache-after-top-paren
(&optional cache
)
2280 ;; Return the position just after the latest brace/bracket/paren (whether
2281 ;; left or right) recorded in CACHE (default `c-state-cache') or nil.
2282 (let ((cash (or cache
'c-state-cache
)))
2283 `(if (consp (car ,cash
))
2286 (1+ (car ,cash
))))))
2288 (defun c-get-cache-scan-pos (here)
2289 ;; From the state-cache, determine the buffer position from which we might
2290 ;; scan forward to HERE to update this cache. This position will be just
2291 ;; after a paren/brace/bracket recorded in the cache, if possible, otherwise
2292 ;; return the earliest position in the accessible region which isn't within
2293 ;; a literal. If the visible portion of the buffer is entirely within a
2294 ;; literal, return NIL.
2295 (let ((c c-state-cache
) elt
)
2296 ;(while (>= (or (c-state-cache-top-lparen c) 1) here)
2298 (>= (c-state-cache-top-lparen c
) here
))
2304 (if (> (cdr elt
) here
)
2308 ((<= (c-state-get-min-scan-pos) here
)
2309 (c-state-get-min-scan-pos))
2312 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2313 ;; Variables which keep track of preprocessor constructs.
2314 (defvar c-state-old-cpp-beg nil
)
2315 (make-variable-buffer-local 'c-state-old-cpp-beg
)
2316 (defvar c-state-old-cpp-end nil
)
2317 (make-variable-buffer-local 'c-state-old-cpp-end
)
2318 ;; These are the limits of the macro containing point at the previous call of
2319 ;; `c-parse-state', or nil.
2321 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2322 ;; Defuns which analyze the buffer, yet don't change `c-state-cache'.
2323 (defun c-get-fallback-scan-pos (here)
2324 ;; Return a start position for building `c-state-cache' from
2325 ;; scratch. This will be at the top level, 2 defuns back.
2327 ;; Go back 2 bods, but ignore any bogus positions returned by
2328 ;; beginning-of-defun (i.e. open paren in column zero).
2331 (while (not (or (bobp) (zerop cnt
)))
2332 (c-beginning-of-defun-1) ; Pure elisp BOD.
2333 (if (eq (char-after) ?\
{)
2334 (setq cnt
(1- cnt
)))))
2337 (defun c-state-balance-parens-backwards (here- here
+ top
)
2338 ;; Return the position of the opening paren/brace/bracket before HERE- which
2339 ;; matches the outermost close p/b/b between HERE+ and TOP. Except when
2340 ;; there's a macro, HERE- and HERE+ are the same. Like this:
2342 ;; ............................................
2344 ;; ( [ ( .........#macro.. ) ( ) ] )
2347 ;; return HERE- HERE+ TOP
2349 ;; If there aren't enough opening paren/brace/brackets, return the position
2350 ;; of the outermost one found, or HERE- if there are none. If there are no
2351 ;; closing p/b/bs between HERE+ and TOP, return HERE-. HERE-/+ and TOP
2352 ;; must not be inside literals. Only the accessible portion of the buffer
2355 ;; PART 1: scan from `here+' up to `top', accumulating ")"s which enclose
2356 ;; `here'. Go round the next loop each time we pass over such a ")". These
2357 ;; probably match "("s before `here-'.
2358 (let (pos pa ren
+1 lonely-rens
)
2361 (narrow-to-region (point-min) top
) ; This can move point, sometimes.
2365 (setq ren
+1 (scan-lists pos
1 1)) ; might signal
2366 (setq lonely-rens
(cons ren
+1 lonely-rens
)
2369 ;; PART 2: Scan back before `here-' searching for the "("s
2370 ;; matching/mismatching the ")"s found above. We only need to direct the
2371 ;; caller to scan when we've encountered unmatched right parens.
2376 (and lonely-rens
; actual values aren't used.
2377 (setq pa
(scan-lists pos -
1 1)))
2379 (setq lonely-rens
(cdr lonely-rens
)))))
2382 (defun c-parse-state-get-strategy (here good-pos
)
2383 ;; Determine the scanning strategy for adjusting `c-parse-state', attempting
2384 ;; to minimize the amount of scanning. HERE is the pertinent position in
2385 ;; the buffer, GOOD-POS is a position where `c-state-cache' (possibly with
2386 ;; its head trimmed) is known to be good, or nil if there is no such
2389 ;; The return value is a list, one of the following:
2391 ;; o - ('forward CACHE-POS START-POINT) - scan forward from START-POINT,
2392 ;; which is not less than CACHE-POS.
2393 ;; o - ('backward CACHE-POS nil) - scan backwards (from HERE).
2394 ;; o - ('BOD nil START-POINT) - scan forwards from START-POINT, which is at the
2396 ;; o - ('IN-LIT nil nil) - point is inside the literal containing point-min.
2397 ;; , where CACHE-POS is the highest position recorded in `c-state-cache' at
2399 (let ((cache-pos (c-get-cache-scan-pos here
)) ; highest position below HERE in cache (or 1)
2400 BOD-pos
; position of 2nd BOD before HERE.
2401 strategy
; 'forward, 'backward, 'BOD, or 'IN-LIT.
2403 how-far
) ; putative scanning distance.
2404 (setq good-pos
(or good-pos
(c-state-get-min-scan-pos)))
2406 ((< here
(c-state-get-min-scan-pos))
2407 (setq strategy
'IN-LIT
2412 (setq strategy
'forward
2413 start-point
(max good-pos cache-pos
)
2414 how-far
(- here start-point
)))
2415 ((< (- good-pos here
) (- here cache-pos
)) ; FIXME!!! ; apply some sort of weighting.
2416 (setq strategy
'backward
2417 how-far
(- good-pos here
)))
2419 (setq strategy
'forward
2420 how-far
(- here cache-pos
)
2421 start-point cache-pos
)))
2423 ;; Might we be better off starting from the top level, two defuns back,
2425 (when (> how-far c-state-cache-too-far
)
2426 (setq BOD-pos
(c-get-fallback-scan-pos here
)) ; somewhat EXPENSIVE!!!
2427 (if (< (- here BOD-pos
) how-far
)
2429 start-point BOD-pos
)))
2433 (and (memq strategy
'(forward backward
)) cache-pos
)
2434 (and (memq strategy
'(forward BOD
)) start-point
))))
2437 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2438 ;; Routines which change `c-state-cache' and associated values.
2439 (defun c-renarrow-state-cache ()
2440 ;; The region (more precisely, point-min) has changed since we
2441 ;; calculated `c-state-cache'. Amend `c-state-cache' accordingly.
2442 (if (< (point-min) c-state-point-min
)
2443 ;; If point-min has MOVED BACKWARDS then we drop the state completely.
2444 ;; It would be possible to do a better job here and recalculate the top
2447 (c-state-mark-point-min-literal)
2448 (setq c-state-cache nil
2449 c-state-cache-good-pos c-state-min-scan-pos
2450 c-state-brace-pair-desert nil
))
2452 ;; point-min has MOVED FORWARD.
2454 ;; Is the new point-min inside a (different) literal?
2455 (unless (and c-state-point-min-lit-start
; at prev. point-min
2456 (< (point-min) (c-state-get-min-scan-pos)))
2457 (c-state-mark-point-min-literal))
2459 ;; Cut off a bit of the tail from `c-state-cache'.
2460 (let ((ptr (cons nil c-state-cache
))
2462 (while (and (setq pa
(c-state-cache-top-lparen (cdr ptr
)))
2463 (>= pa
(point-min)))
2464 (setq ptr
(cdr ptr
)))
2467 (if (eq (cdr ptr
) c-state-cache
)
2468 (setq c-state-cache nil
2469 c-state-cache-good-pos c-state-min-scan-pos
)
2471 (setq c-state-cache-good-pos
(1+ (c-state-cache-top-lparen))))
2474 (setq c-state-point-min
(point-min)))
2476 (defun c-append-lower-brace-pair-to-state-cache (from &optional upper-lim
)
2477 ;; If there is a brace pair preceding FROM in the buffer (not necessarily
2478 ;; immediately preceding), push a cons onto `c-state-cache' to represent it.
2479 ;; FROM must not be inside a literal. If UPPER-LIM is non-nil, we append
2480 ;; the highest brace pair whose "}" is below UPPER-LIM.
2482 ;; Return non-nil when this has been done.
2484 ;; This routine should be fast. Since it can get called a LOT, we maintain
2485 ;; `c-state-brace-pair-desert', a small cache of "failures", such that we
2486 ;; reduce the time wasted in repeated fruitless searches in brace deserts.
2489 (let ((bra from
) ce
; Positions of "{" and "}".
2491 (cache-pos (c-state-cache-top-lparen)) ; might be nil.
2492 (macro-start-or-from
2493 (progn (goto-char from
)
2494 (c-beginning-of-macro)
2496 (or upper-lim
(setq upper-lim from
))
2498 ;; If we're essentially repeating a fruitless search, just give up.
2499 (unless (and c-state-brace-pair-desert
2500 (eq cache-pos
(car c-state-brace-pair-desert
))
2501 (<= from
(cdr c-state-brace-pair-desert
)))
2502 ;; Only search what we absolutely need to:
2503 (if (and c-state-brace-pair-desert
2504 (eq cache-pos
(car c-state-brace-pair-desert
)))
2505 (narrow-to-region (cdr c-state-brace-pair-desert
) (point-max)))
2507 ;; In the next pair of nested loops, the inner one moves back past a
2508 ;; pair of (mis-)matching parens or brackets; the outer one moves
2509 ;; back over a sequence of unmatched close brace/paren/bracket each
2515 (and (setq ce
(scan-lists bra -
1 -
1)) ; back past )/]/}; might signal
2516 (setq bra
(scan-lists ce -
1 1)) ; back past (/[/{; might signal
2517 (or (> ce upper-lim
)
2518 (not (eq (char-after bra
) ?\
{))
2519 (and (goto-char bra
)
2520 (c-beginning-of-macro)
2521 (< (point) macro-start-or-from
))))))
2522 (and ce
(< ce bra
)))
2523 (setq bra ce
)) ; If we just backed over an unbalanced closing
2526 (if (and ce
(< bra ce
) (eq (char-after bra
) ?\
{))
2527 ;; We've found the desired brace-pair.
2529 (setq new-cons
(cons bra
(1+ ce
)))
2531 ((consp (car c-state-cache
))
2532 (setcar c-state-cache new-cons
))
2533 ((and (numberp (car c-state-cache
)) ; probably never happens
2534 (< ce
(car c-state-cache
)))
2535 (setcdr c-state-cache
2536 (cons new-cons
(cdr c-state-cache
))))
2537 (t (setq c-state-cache
(cons new-cons c-state-cache
)))))
2539 ;; We haven't found a brace pair. Record this.
2540 (setq c-state-brace-pair-desert
(cons cache-pos from
))))))))
2542 (defsubst c-state-push-any-brace-pair
(bra+1 macro-start-or-here
)
2543 ;; If BRA+1 is nil, do nothing. Otherwise, BRA+1 is the buffer position
2544 ;; following a {, and that brace has a (mis-)matching } (or ]), and we
2545 ;; "push" "a" brace pair onto `c-state-cache'.
2547 ;; Here "push" means overwrite the top element if it's itself a brace-pair,
2548 ;; otherwise push it normally.
2550 ;; The brace pair we push is normally the one surrounding BRA+1, but if the
2551 ;; latter is inside a macro, not being a macro containing
2552 ;; MACRO-START-OR-HERE, we scan backwards through the buffer for a non-macro
2553 ;; base pair. This latter case is assumed to be rare.
2555 ;; Note: POINT is not preserved in this routine.
2557 (if (or (> bra
+1 macro-start-or-here
)
2558 (progn (goto-char bra
+1)
2559 (not (c-beginning-of-macro))))
2561 (cons (cons (1- bra
+1)
2562 (scan-lists bra
+1 1 1))
2563 (if (consp (car c-state-cache
))
2566 ;; N.B. This defsubst codes one method for the simple, normal case,
2567 ;; and a more sophisticated, slower way for the general case. Don't
2568 ;; eliminate this defsubst - it's a speed optimization.
2569 (c-append-lower-brace-pair-to-state-cache (1- bra
+1)))))
2571 (defun c-append-to-state-cache (from)
2572 ;; Scan the buffer from FROM to (point-max), adding elements into
2573 ;; `c-state-cache' for braces etc. Return a candidate for
2574 ;; `c-state-cache-good-pos'.
2576 ;; FROM must be after the latest brace/paren/bracket in `c-state-cache', if
2577 ;; any. Typically, it is immediately after it. It must not be inside a
2579 (let ((here-bol (c-point 'bol
(point-max)))
2580 (macro-start-or-here
2581 (save-excursion (goto-char (point-max))
2582 (if (c-beginning-of-macro)
2585 pa
+1 ; pos just after an opening PAren (or brace).
2586 (ren+1 from
) ; usually a pos just after an closing paREN etc.
2587 ; Is actually the pos. to scan for a (/{/[ from,
2588 ; which sometimes is after a silly )/}/].
2589 paren
+1 ; Pos after some opening or closing paren.
2590 paren
+1s
; A list of `paren+1's; used to determine a
2592 bra
+1 ce
+1 ; just after L/R bra-ces.
2593 bra
+1s
; list of OLD values of bra+1.
2594 mstart
) ; start of a macro.
2597 ;; Each time round the following loop, we enter a succesively deeper
2598 ;; level of brace/paren nesting. (Except sometimes we "continue at
2599 ;; the existing level".) `pa+1' is a pos inside an opening
2600 ;; brace/paren/bracket, usually just after it.
2603 ;; Each time round the next loop moves forward over an opening then
2604 ;; a closing brace/bracket/paren. This loop is white hot, so it
2605 ;; plays ugly tricks to go fast. DON'T PUT ANYTHING INTO THIS
2606 ;; LOOP WHICH ISN'T ABSOLUTELY NECESSARY!!! It terminates when a
2607 ;; call of `scan-lists' signals an error, which happens when there
2608 ;; are no more b/b/p's to scan.
2611 (setq pa
+1 (scan-lists ren
+1 1 -
1) ; Into (/{/[; might signal
2612 paren
+1s
(cons pa
+1 paren
+1s
))
2613 (setq ren
+1 (scan-lists pa
+1 1 1)) ; Out of )/}/]; might signal
2614 (if (and (eq (char-before pa
+1) ?
{)) ; Check for a macro later.
2616 (setcar paren
+1s ren
+1)))
2618 (if (and pa
+1 (> pa
+1 ren
+1))
2619 ;; We've just entered a deeper nesting level.
2621 ;; Insert the brace pair (if present) and the single open
2622 ;; paren/brace/bracket into `c-state-cache' It cannot be
2623 ;; inside a macro, except one around point, because of what
2624 ;; `c-neutralize-syntax-in-CPP' has done.
2625 (c-state-push-any-brace-pair bra
+1 macro-start-or-here
)
2626 ;; Insert the opening brace/bracket/paren position.
2627 (setq c-state-cache
(cons (1- pa
+1) c-state-cache
))
2628 ;; Clear admin stuff for the next more nested part of the scan.
2629 (setq ren
+1 pa
+1 pa
+1 nil bra
+1 nil bra
+1s nil
)
2630 t
) ; Carry on the loop
2632 ;; All open p/b/b's at this nesting level, if any, have probably
2633 ;; been closed by matching/mismatching ones. We're probably
2634 ;; finished - we just need to check for having found an
2635 ;; unmatched )/}/], which we ignore. Such a )/}/] can't be in a
2636 ;; macro, due the action of `c-neutralize-syntax-in-CPP'.
2637 (c-safe (setq ren
+1 (scan-lists ren
+1 1 1)))))) ; acts as loop control.
2639 ;; Record the final, innermost, brace-pair if there is one.
2640 (c-state-push-any-brace-pair bra
+1 macro-start-or-here
)
2642 ;; Determine a good pos
2643 (while (and (setq paren
+1 (car paren
+1s
))
2644 (> (if (> paren
+1 macro-start-or-here
)
2647 (setq mstart
(and (c-beginning-of-macro)
2649 (or mstart paren
+1))
2651 (setq paren
+1s
(cdr paren
+1s
)))
2653 ((and paren
+1 mstart
)
2654 (min paren
+1 mstart
))
2658 (defun c-remove-stale-state-cache (good-pos pps-point
)
2659 ;; Remove stale entries from the `c-cache-state', i.e. those which will
2660 ;; not be in it when it is amended for position (point-max).
2661 ;; Additionally, the "outermost" open-brace entry before (point-max)
2662 ;; will be converted to a cons if the matching close-brace is scanned.
2664 ;; GOOD-POS is a "maximal" "safe position" - there must be no open
2665 ;; parens/braces/brackets between GOOD-POS and (point-max).
2667 ;; As a second thing, calculate the result of parse-partial-sexp at
2668 ;; PPS-POINT, w.r.t. GOOD-POS. The motivation here is that
2669 ;; `c-state-cache-good-pos' may become PPS-POINT, but the caller may need to
2670 ;; adjust it to get outside a string/comment. (Sorry about this! The code
2671 ;; needs to be FAST).
2673 ;; Return a list (GOOD-POS SCAN-BACK-POS PPS-STATE), where
2674 ;; o - GOOD-POS is a position where the new value `c-state-cache' is known
2675 ;; to be good (we aim for this to be as high as possible);
2676 ;; o - SCAN-BACK-POS, if not nil, indicates there may be a brace pair
2677 ;; preceding POS which needs to be recorded in `c-state-cache'. It is a
2678 ;; position to scan backwards from.
2679 ;; o - PPS-STATE is the parse-partial-sexp state at PPS-POINT.
2681 (narrow-to-region 1 (point-max))
2683 (let* ((in-macro-start ; start of macro containing (point-max) or nil.
2685 (goto-char (point-max))
2686 (and (c-beginning-of-macro)
2688 (good-pos-actual-macro-start ; Start of macro containing good-pos
2690 (and (< good-pos
(point-max))
2692 (goto-char good-pos
)
2693 (and (c-beginning-of-macro)
2695 (good-pos-actual-macro-end ; End of this macro, (maybe
2696 ; (point-max)), or nil.
2697 (and good-pos-actual-macro-start
2699 (goto-char good-pos-actual-macro-start
)
2702 pps-state
; Will be 9 or 10 elements long.
2704 upper-lim
; ,beyond which `c-state-cache' entries are removed
2706 pair-beg pps-point-state target-depth
)
2708 ;; Remove entries beyond (point-max). Also remove any entries inside
2709 ;; a macro, unless (point-max) is in the same macro.
2711 (if (or (null c-state-old-cpp-beg
)
2712 (and (> (point-max) c-state-old-cpp-beg
)
2713 (< (point-max) c-state-old-cpp-end
)))
2715 (min (point-max) c-state-old-cpp-beg
)))
2716 (while (and c-state-cache
(>= (c-state-cache-top-lparen) upper-lim
))
2717 (setq c-state-cache
(cdr c-state-cache
)))
2718 ;; If `upper-lim' is inside the last recorded brace pair, remove its
2719 ;; RBrace and indicate we'll need to search backwards for a previous
2721 (when (and c-state-cache
2722 (consp (car c-state-cache
))
2723 (> (cdar c-state-cache
) upper-lim
))
2724 (setcar c-state-cache
(caar c-state-cache
))
2725 (setq scan-back-pos
(car c-state-cache
)))
2727 ;; The next loop jumps forward out of a nested level of parens each
2728 ;; time round; the corresponding elements in `c-state-cache' are
2729 ;; removed. `pos' is just after the brace-pair or the open paren at
2730 ;; (car c-state-cache). There can be no open parens/braces/brackets
2731 ;; between `good-pos'/`good-pos-actual-macro-start' and (point-max),
2732 ;; due to the interface spec to this function.
2733 (setq pos
(if (and good-pos-actual-macro-end
2734 (not (eq good-pos-actual-macro-start
2736 (1+ good-pos-actual-macro-end
) ; get outside the macro as
2737 ; marked by a `category' text property.
2740 (while (and c-state-cache
2741 (< (point) (point-max)))
2743 ((null pps-state
) ; first time through
2744 (setq target-depth -
1))
2745 ((eq (car pps-state
) target-depth
) ; found closing ),},]
2746 (setq target-depth
(1- (car pps-state
))))
2747 ;; Do nothing when we've merely reached pps-point.
2753 (point) (if (< (point) pps-point
) pps-point
(point-max))
2757 (if (= (point) pps-point
)
2758 (setq pps-point-state pps-state
))
2760 (when (eq (car pps-state
) target-depth
)
2761 (setq pos
(point)) ; POS is now just after an R-paren/brace.
2763 ((and (consp (car c-state-cache
))
2764 (eq (point) (cdar c-state-cache
)))
2765 ;; We've just moved out of the paren pair containing the brace-pair
2766 ;; at (car c-state-cache). `pair-beg' is where the open paren is,
2767 ;; and is potentially where the open brace of a cons in
2768 ;; c-state-cache will be.
2769 (setq pair-beg
(car-safe (cdr c-state-cache
))
2770 c-state-cache
(cdr-safe (cdr c-state-cache
)))) ; remove {}pair + containing Lparen.
2771 ((numberp (car c-state-cache
))
2772 (setq pair-beg
(car c-state-cache
)
2773 c-state-cache
(cdr c-state-cache
))) ; remove this
2775 ((numberp (cadr c-state-cache
))
2776 (setq pair-beg
(cadr c-state-cache
)
2777 c-state-cache
(cddr c-state-cache
))) ; Remove a paren pair
2778 ; together with enclosed brace pair.
2779 ;; (t nil) ; Ignore an unmated Rparen.
2782 (if (< (point) pps-point
)
2783 (setq pps-state
(parse-partial-sexp (point) pps-point
2784 nil nil
; TARGETDEPTH, STOPBEFORE
2787 ;; If the last paren pair we moved out of was actually a brace pair,
2788 ;; insert it into `c-state-cache'.
2789 (when (and pair-beg
(eq (char-after pair-beg
) ?
{))
2790 (if (consp (car-safe c-state-cache
))
2791 (setq c-state-cache
(cdr c-state-cache
)))
2792 (setq c-state-cache
(cons (cons pair-beg pos
)
2795 (list pos scan-back-pos pps-state
)))))
2797 (defun c-remove-stale-state-cache-backwards (here cache-pos
)
2798 ;; Strip stale elements of `c-state-cache' by moving backwards through the
2799 ;; buffer, and inform the caller of the scenario detected.
2801 ;; HERE is the position we're setting `c-state-cache' for.
2802 ;; CACHE-POS is just after the latest recorded position in `c-state-cache'
2803 ;; before HERE, or a position at or near point-min which isn't in a
2806 ;; This function must only be called only when (> `c-state-cache-good-pos'
2807 ;; HERE). Usually the gap between CACHE-POS and HERE is large. It is thus
2808 ;; optimized to eliminate (or minimize) scanning between these two
2811 ;; Return a three element list (GOOD-POS SCAN-BACK-POS FWD-FLAG), where:
2812 ;; o - GOOD-POS is a "good position", where `c-state-cache' is valid, or
2813 ;; could become so after missing elements are inserted into
2814 ;; `c-state-cache'. This is JUST AFTER an opening or closing
2815 ;; brace/paren/bracket which is already in `c-state-cache' or just before
2816 ;; one otherwise. exceptionally (when there's no such b/p/b handy) the BOL
2817 ;; before `here''s line, or the start of the literal containing it.
2818 ;; o - SCAN-BACK-POS, if non-nil, indicates there may be a brace pair
2819 ;; preceding POS which isn't recorded in `c-state-cache'. It is a position
2820 ;; to scan backwards from.
2821 ;; o - FWD-FLAG, if non-nil, indicates there may be parens/braces between
2822 ;; POS and HERE which aren't recorded in `c-state-cache'.
2824 ;; The comments in this defun use "paren" to mean parenthesis or square
2825 ;; bracket (as contrasted with a brace), and "(" and ")" likewise.
2827 ;; . {..} (..) (..) ( .. { } ) (...) ( .... . ..)
2829 ;; CP E here D C good
2830 (let ((pos c-state-cache-good-pos
)
2831 pa ren
; positions of "(" and ")"
2832 dropped-cons
; whether the last element dropped from `c-state-cache'
2833 ; was a cons (representing a brace-pair)
2834 good-pos
; see above.
2835 lit
; (START . END) of a literal containing some point.
2836 here-lit-start here-lit-end
; bounds of literal containing `here'
2838 here- here
+ ; start/end of macro around HERE, or HERE
2839 (here-bol (c-point 'bol here
))
2840 (too-far-back (max (- here c-state-cache-too-far
) (point-min))))
2842 ;; Remove completely irrelevant entries from `c-state-cache'.
2843 (while (and c-state-cache
2844 (>= (setq pa
(c-state-cache-top-lparen)) here
))
2845 (setq dropped-cons
(consp (car c-state-cache
)))
2846 (setq c-state-cache
(cdr c-state-cache
))
2848 ;; At this stage, (> pos here);
2849 ;; (< (c-state-cache-top-lparen) here) (or is nil).
2852 ((and (consp (car c-state-cache
))
2853 (> (cdar c-state-cache
) here
))
2854 ;; CASE 1: The top of the cache is a brace pair which now encloses
2855 ;; `here'. As good-pos, return the address. of the "{". Since we've no
2856 ;; knowledge of what's inside these braces, we have no alternative but
2857 ;; to direct the caller to scan the buffer from the opening brace.
2858 (setq pos
(caar c-state-cache
))
2859 (setcar c-state-cache pos
)
2860 (list (1+ pos
) pos t
)) ; return value. We've just converted a brace pair
2861 ; entry into a { entry, so the caller needs to
2862 ; search for a brace pair before the {.
2864 ;; `here' might be inside a literal. Check for this.
2866 (setq lit
(c-state-literal-at here
)
2867 here-lit-start
(or (car lit
) here
)
2868 here-lit-end
(or (cdr lit
) here
))
2869 ;; Has `here' just "newly entered" a macro?
2871 (goto-char here-lit-start
)
2872 (if (and (c-beginning-of-macro)
2873 (or (null c-state-old-cpp-beg
)
2874 (not (= (point) c-state-old-cpp-beg
))))
2876 (setq here-
(point))
2878 (setq here
+ (point)))
2879 (setq here- here-lit-start
2880 here
+ here-lit-end
)))
2882 ;; `here' might be nested inside any depth of parens (or brackets but
2883 ;; not braces). Scan backwards to find the outermost such opening
2884 ;; paren, if there is one. This will be the scan position to return.
2886 (narrow-to-region cache-pos
(point-max))
2887 (setq pos
(c-state-balance-parens-backwards here- here
+ pos
)))
2888 nil
)) ; for the cond
2890 ((< pos here-lit-start
)
2891 ;; CASE 2: Address of outermost ( or [ which now encloses `here', but
2892 ;; didn't enclose the (previous) `c-state-cache-good-pos'. If there is
2893 ;; a brace pair preceding this, it will already be in `c-state-cache',
2894 ;; unless there was a brace pair after it, i.e. there'll only be one to
2895 ;; scan for if we've just deleted one.
2896 (list pos
(and dropped-cons pos
) t
)) ; Return value.
2898 ;; `here' isn't enclosed in a (previously unrecorded) bracket/paren.
2899 ;; Further forward scanning isn't needed, but we still need to find a
2900 ;; GOOD-POS. Step out of all enclosing "("s on HERE's line.
2903 (narrow-to-region here-bol
(point-max))
2904 (setq pos here-lit-start
)
2905 (c-safe (while (setq pa
(scan-lists pos -
1 1))
2906 (setq pos pa
)))) ; might signal
2907 nil
)) ; for the cond
2909 ((setq ren
(c-safe-scan-lists pos -
1 -
1 too-far-back
))
2910 ;; CASE 3: After a }/)/] before `here''s BOL.
2911 (list (1+ ren
) (and dropped-cons pos
) nil
)) ; Return value
2914 ;; CASE 4; Best of a bad job: BOL before `here-bol', or beginning of
2915 ;; literal containing it.
2916 (setq good-pos
(c-state-lit-beg (c-point 'bopl here-bol
)))
2917 (list good-pos
(and dropped-cons good-pos
) nil
)))))
2920 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2921 ;; Externally visible routines.
2923 (defun c-state-cache-init ()
2924 (setq c-state-cache nil
2925 c-state-cache-good-pos
1
2926 c-state-nonlit-pos-cache nil
2927 c-state-nonlit-pos-cache-limit
1
2928 c-state-brace-pair-desert nil
2930 c-state-point-min-lit-type nil
2931 c-state-point-min-lit-start nil
2932 c-state-min-scan-pos
1
2933 c-state-old-cpp-beg nil
2934 c-state-old-cpp-end nil
)
2935 (c-state-mark-point-min-literal))
2937 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2938 ;; Debugging routines to dump `c-state-cache' in a "replayable" form.
2939 ;; (defmacro c-sc-de (elt) ; "c-state-cache-dump-element"
2940 ;; `(format ,(concat "(setq " (symbol-name elt) " %s) ") ,elt))
2941 ;; (defmacro c-sc-qde (elt) ; "c-state-cache-quote-dump-element"
2942 ;; `(format ,(concat "(setq " (symbol-name elt) " '%s) ") ,elt))
2943 ;; (defun c-state-dump ()
2944 ;; ;; For debugging.
2947 ;; (c-sc-qde c-state-cache)
2948 ;; (c-sc-de c-state-cache-good-pos)
2949 ;; (c-sc-qde c-state-nonlit-pos-cache)
2950 ;; (c-sc-de c-state-nonlit-pos-cache-limit)
2951 ;; (c-sc-qde c-state-brace-pair-desert)
2952 ;; (c-sc-de c-state-point-min)
2953 ;; (c-sc-de c-state-point-min-lit-type)
2954 ;; (c-sc-de c-state-point-min-lit-start)
2955 ;; (c-sc-de c-state-min-scan-pos)
2956 ;; (c-sc-de c-state-old-cpp-beg)
2957 ;; (c-sc-de c-state-old-cpp-end)))
2958 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
2960 (defun c-invalidate-state-cache-1 (here)
2961 ;; Invalidate all info on `c-state-cache' that applies to the buffer at HERE
2962 ;; or higher and set `c-state-cache-good-pos' accordingly. The cache is
2963 ;; left in a consistent state.
2965 ;; This is much like `c-whack-state-after', but it never changes a paren
2966 ;; pair element into an open paren element. Doing that would mean that the
2967 ;; new open paren wouldn't have the required preceding paren pair element.
2969 ;; This function is called from c-after-change.
2971 ;; The cache of non-literals:
2972 (if (< here c-state-nonlit-pos-cache-limit
)
2973 (setq c-state-nonlit-pos-cache-limit here
))
2976 ;; Case 1: if `here' is in a literal containing point-min, everything
2977 ;; becomes (or is already) nil.
2978 (if (or (null c-state-cache-good-pos
)
2979 (< here
(c-state-get-min-scan-pos)))
2980 (setq c-state-cache nil
2981 c-state-cache-good-pos nil
2982 c-state-min-scan-pos nil
)
2984 ;; Truncate `c-state-cache' and set `c-state-cache-good-pos' to a value
2985 ;; below `here'. To maintain its consistency, we may need to insert a new
2987 (let ((here-bol (c-point 'bol here
))
2988 too-high-pa
; recorded {/(/[ next above here, or nil.
2989 dropped-cons
; was the last removed element a brace pair?
2991 ;; The easy bit - knock over-the-top bits off `c-state-cache'.
2992 (while (and c-state-cache
2993 (>= (setq pa
(c-state-cache-top-paren)) here
))
2994 (setq dropped-cons
(consp (car c-state-cache
))
2995 too-high-pa
(c-state-cache-top-lparen)
2996 c-state-cache
(cdr c-state-cache
)))
2998 ;; Do we need to add in an earlier brace pair, having lopped one off?
2999 (if (and dropped-cons
3000 (< too-high-pa
(+ here c-state-cache-too-far
)))
3001 (c-append-lower-brace-pair-to-state-cache too-high-pa here-bol
))
3002 (setq c-state-cache-good-pos
(or (c-state-cache-after-top-paren)
3003 (c-state-get-min-scan-pos)))))
3005 ;; The brace-pair desert marker:
3006 (when (car c-state-brace-pair-desert
)
3007 (if (< here
(car c-state-brace-pair-desert
))
3008 (setq c-state-brace-pair-desert nil
)
3009 (if (< here
(cdr c-state-brace-pair-desert
))
3010 (setcdr c-state-brace-pair-desert here
)))))
3012 (defun c-parse-state-1 ()
3013 ;; Find and record all noteworthy parens between some good point earlier in
3014 ;; the file and point. That good point is at least the beginning of the
3015 ;; top-level construct we are in, or the beginning of the preceding
3016 ;; top-level construct if we aren't in one.
3018 ;; The returned value is a list of the noteworthy parens with the last one
3019 ;; first. If an element in the list is an integer, it's the position of an
3020 ;; open paren (of any type) which has not been closed before the point. If
3021 ;; an element is a cons, it gives the position of a closed BRACE paren
3022 ;; pair[*]; the car is the start brace position and the cdr is the position
3023 ;; following the closing brace. Only the last closed brace paren pair
3024 ;; before each open paren and before the point is recorded, and thus the
3025 ;; state never contains two cons elements in succession. When a close brace
3026 ;; has no matching open brace (e.g., the matching brace is outside the
3027 ;; visible region), it is not represented in the returned value.
3029 ;; [*] N.B. The close "brace" might be a mismatching close bracket or paren.
3030 ;; This defun explicitly treats mismatching parens/braces/brackets as
3031 ;; matching. It is the open brace which makes it a "brace" pair.
3033 ;; If POINT is within a macro, open parens and brace pairs within
3034 ;; THIS macro MIGHT be recorded. This depends on whether their
3035 ;; syntactic properties have been suppressed by
3036 ;; `c-neutralize-syntax-in-CPP'. This might need fixing (2008-12-11).
3038 ;; Currently no characters which are given paren syntax with the
3039 ;; syntax-table property are recorded, i.e. angle bracket arglist
3040 ;; parens are never present here. Note that this might change.
3042 ;; BUG: This function doesn't cope entirely well with unbalanced
3043 ;; parens in macros. (2008-12-11: this has probably been resolved
3044 ;; by the function `c-neutralize-syntax-in-CPP'.) E.g. in the
3045 ;; following case the brace before the macro isn't balanced with the
3052 ;; Note to maintainers: this function DOES get called with point
3053 ;; within comments and strings, so don't assume it doesn't!
3055 ;; This function might do hidden buffer changes.
3056 (let* ((here (point))
3057 (here-bopl (c-point 'bopl
))
3058 strategy
; 'forward, 'backward etc..
3059 ;; Candidate positions to start scanning from:
3060 cache-pos
; highest position below HERE already existing in
3066 scan-backward-pos scan-forward-p
) ; used for 'backward.
3067 ;; If POINT-MIN has changed, adjust the cache
3068 (unless (= (point-min) c-state-point-min
)
3069 (c-renarrow-state-cache))
3072 (setq res
(c-parse-state-get-strategy here c-state-cache-good-pos
)
3074 cache-pos
(cadr res
)
3075 start-point
(nth 2 res
))
3077 (when (eq strategy
'BOD
)
3078 (setq c-state-cache nil
3079 c-state-cache-good-pos start-point
))
3084 ((memq strategy
'(forward BOD
))
3085 (narrow-to-region (point-min) here
)
3086 (setq res
(c-remove-stale-state-cache start-point here-bopl
))
3087 (setq cache-pos
(car res
)
3088 scan-backward-pos
(cadr res
)
3089 bopl-state
(car (cddr res
))) ; will be nil if (< here-bopl
3091 (if scan-backward-pos
3092 (c-append-lower-brace-pair-to-state-cache scan-backward-pos
))
3094 (c-append-to-state-cache cache-pos
))
3095 (setq c-state-cache-good-pos
3097 (< good-pos
(- here c-state-cache-too-far
)))
3098 (c-state-cache-non-literal-place here-bopl bopl-state
)
3101 ((eq strategy
'backward
)
3102 (setq res
(c-remove-stale-state-cache-backwards here cache-pos
)
3104 scan-backward-pos
(cadr res
)
3105 scan-forward-p
(car (cddr res
)))
3106 (if scan-backward-pos
3107 (c-append-lower-brace-pair-to-state-cache
3109 (setq c-state-cache-good-pos
3111 (progn (narrow-to-region (point-min) here
)
3112 (c-append-to-state-cache good-pos
))
3114 (c-get-cache-scan-pos good-pos
))))
3116 (t ; (eq strategy 'IN-LIT)
3117 (setq c-state-cache nil
3118 c-state-cache-good-pos nil
)))))
3122 (defun c-invalidate-state-cache (here)
3123 ;; This is a wrapper over `c-invalidate-state-cache-1'.
3125 ;; It suppresses the syntactic effect of the < and > (template) brackets and
3126 ;; of all parens in preprocessor constructs, except for any such construct
3127 ;; containing point. We can then call `c-invalidate-state-cache-1' without
3128 ;; worrying further about macros and template delimiters.
3129 (c-with-<-
>-as-parens-suppressed
3130 (if (and c-state-old-cpp-beg
3131 (< c-state-old-cpp-beg here
))
3132 (c-with-all-but-one-cpps-commented-out
3134 (min c-state-old-cpp-end here
)
3135 (c-invalidate-state-cache-1 here
))
3136 (c-with-cpps-commented-out
3137 (c-invalidate-state-cache-1 here
)))))
3139 (defun c-parse-state ()
3140 ;; This is a wrapper over `c-parse-state-1'. See that function for a
3141 ;; description of the functionality and return value.
3143 ;; It suppresses the syntactic effect of the < and > (template) brackets and
3144 ;; of all parens in preprocessor constructs, except for any such construct
3145 ;; containing point. We can then call `c-parse-state-1' without worrying
3146 ;; further about macros and template delimiters.
3147 (let (here-cpp-beg here-cpp-end
)
3149 (when (c-beginning-of-macro)
3150 (setq here-cpp-beg
(point))
3152 (> (setq here-cpp-end
(c-syntactic-end-of-macro))
3154 (setq here-cpp-beg nil here-cpp-end nil
))))
3155 ;; FIXME!!! Put in a `condition-case' here to protect the integrity of the
3158 (c-with-<-
>-as-parens-suppressed
3159 (if (and here-cpp-beg
(> here-cpp-end here-cpp-beg
))
3160 (c-with-all-but-one-cpps-commented-out
3161 here-cpp-beg here-cpp-end
3163 (c-with-cpps-commented-out
3164 (c-parse-state-1))))
3165 (setq c-state-old-cpp-beg
(and here-cpp-beg
(copy-marker here-cpp-beg t
))
3166 c-state-old-cpp-end
(and here-cpp-end
(copy-marker here-cpp-end t
)))
3169 ;; Debug tool to catch cache inconsistencies. This is called from
3171 (defvar c-debug-parse-state nil
)
3172 (unless (fboundp 'c-real-parse-state
)
3173 (fset 'c-real-parse-state
(symbol-function 'c-parse-state
)))
3174 (cc-bytecomp-defun c-real-parse-state)
3176 (defvar c-parse-state-state nil
)
3177 (defun c-record-parse-state-state ()
3178 (setq c-parse-state-state
3181 (cons arg
(symbol-value arg
)))
3183 c-state-cache-good-pos
3184 c-state-nonlit-pos-cache
3185 c-state-nonlit-pos-cache-limit
3186 c-state-brace-pair-desert
3188 c-state-point-min-lit-type
3189 c-state-point-min-lit-start
3190 c-state-min-scan-pos
3192 c-state-old-cpp-end
))))
3193 (defun c-replay-parse-state-state ()
3198 (format "%s %s%s" (car arg
) (if (atom (cdr arg
)) "" "'") (cdr arg
)))
3199 c-parse-state-state
" ")
3202 (defun c-debug-parse-state ()
3203 (let ((here (point)) (res1 (c-real-parse-state)) res2
)
3204 (let ((c-state-cache nil
)
3205 (c-state-cache-good-pos 1)
3206 (c-state-nonlit-pos-cache nil
)
3207 (c-state-nonlit-pos-cache-limit 1)
3208 (c-state-brace-pair-desert nil
)
3209 (c-state-point-min 1)
3210 (c-state-point-min-lit-type nil
)
3211 (c-state-point-min-lit-start nil
)
3212 (c-state-min-scan-pos 1)
3213 (c-state-old-cpp-beg nil
)
3214 (c-state-old-cpp-end nil
))
3215 (setq res2
(c-real-parse-state)))
3216 (unless (equal res1 res2
)
3217 ;; The cache can actually go further back due to the ad-hoc way
3218 ;; the first paren is found, so try to whack off a bit of its
3219 ;; start before complaining.
3221 ;; (goto-char (or (c-least-enclosing-brace res2) (point)))
3222 ;; (c-beginning-of-defun-1)
3223 ;; (while (not (or (bobp) (eq (char-after) ?{)))
3224 ;; (c-beginning-of-defun-1))
3225 ;; (unless (equal (c-whack-state-before (point) res1) res2)
3226 ;; (message (concat "c-parse-state inconsistency at %s: "
3227 ;; "using cache: %s, from scratch: %s")
3228 ;; here res1 res2)))
3229 (message (concat "c-parse-state inconsistency at %s: "
3230 "using cache: %s, from scratch: %s")
3232 (message "Old state:")
3233 (c-replay-parse-state-state))
3234 (c-record-parse-state-state)
3237 (defun c-toggle-parse-state-debug (&optional arg
)
3239 (setq c-debug-parse-state
(c-calculate-state arg c-debug-parse-state
))
3240 (fset 'c-parse-state
(symbol-function (if c-debug-parse-state
3241 'c-debug-parse-state
3242 'c-real-parse-state
)))
3243 (c-keep-region-active))
3244 (when c-debug-parse-state
3245 (c-toggle-parse-state-debug 1))
3248 (defun c-whack-state-before (bufpos paren-state
)
3249 ;; Whack off any state information from PAREN-STATE which lies
3250 ;; before BUFPOS. Not destructive on PAREN-STATE.
3251 (let* ((newstate (list nil
))
3255 (setq car
(car paren-state
)
3256 paren-state
(cdr paren-state
))
3257 (if (< (if (consp car
) (car car
) car
) bufpos
)
3258 (setq paren-state nil
)
3259 (setcdr ptr
(list car
))
3260 (setq ptr
(cdr ptr
))))
3263 (defun c-whack-state-after (bufpos paren-state
)
3264 ;; Whack off any state information from PAREN-STATE which lies at or
3265 ;; after BUFPOS. Not destructive on PAREN-STATE.
3268 (let ((car (car paren-state
)))
3270 ;; just check the car, because in a balanced brace
3271 ;; expression, it must be impossible for the corresponding
3272 ;; close brace to be before point, but the open brace to
3274 (if (<= bufpos
(car car
))
3276 (if (< bufpos
(cdr car
))
3277 ;; its possible that the open brace is before
3278 ;; bufpos, but the close brace is after. In that
3279 ;; case, convert this to a non-cons element. The
3280 ;; rest of the state is before bufpos, so we're
3282 (throw 'done
(cons (car car
) (cdr paren-state
)))
3283 ;; we know that both the open and close braces are
3284 ;; before bufpos, so we also know that everything else
3285 ;; on state is before bufpos.
3286 (throw 'done paren-state
)))
3289 ;; it's before bufpos, so everything else should too.
3290 (throw 'done paren-state
)))
3291 (setq paren-state
(cdr paren-state
)))
3294 (defun c-most-enclosing-brace (paren-state &optional bufpos
)
3295 ;; Return the bufpos of the innermost enclosing open paren before
3296 ;; bufpos, or nil if none was found.
3298 (or bufpos
(setq bufpos
134217727))
3300 (setq enclosingp
(car paren-state
)
3301 paren-state
(cdr paren-state
))
3302 (if (or (consp enclosingp
)
3303 (>= enclosingp bufpos
))
3304 (setq enclosingp nil
)
3305 (setq paren-state nil
)))
3308 (defun c-least-enclosing-brace (paren-state)
3309 ;; Return the bufpos of the outermost enclosing open paren, or nil
3310 ;; if none was found.
3313 (setq elem
(car paren-state
)
3314 paren-state
(cdr paren-state
))
3319 (defun c-safe-position (bufpos paren-state
)
3320 ;; Return the closest "safe" position recorded on PAREN-STATE that
3321 ;; is higher up than BUFPOS. Return nil if PAREN-STATE doesn't
3322 ;; contain any. Return nil if BUFPOS is nil, which is useful to
3323 ;; find the closest limit before a given limit that might be nil.
3325 ;; A "safe" position is a position at or after a recorded open
3326 ;; paren, or after a recorded close paren. The returned position is
3327 ;; thus either the first position after a close brace, or the first
3328 ;; position after an enclosing paren, or at the enclosing paren in
3329 ;; case BUFPOS is immediately after it.
3334 (setq elem
(car paren-state
))
3336 (cond ((< (cdr elem
) bufpos
)
3337 (throw 'done
(cdr elem
)))
3338 ((< (car elem
) bufpos
)
3340 (throw 'done
(min (1+ (car elem
)) bufpos
))))
3342 ;; elem is the position at and not after the opening paren, so
3343 ;; we can go forward one more step unless it's equal to
3344 ;; bufpos. This is useful in some cases avoid an extra paren
3345 ;; level between the safe position and bufpos.
3346 (throw 'done
(min (1+ elem
) bufpos
))))
3347 (setq paren-state
(cdr paren-state
)))))))
3349 (defun c-beginning-of-syntax ()
3350 ;; This is used for `font-lock-beginning-of-syntax-function'. It
3351 ;; goes to the closest previous point that is known to be outside
3352 ;; any string literal or comment. `c-state-cache' is used if it has
3353 ;; a position in the vicinity.
3354 (let* ((paren-state c-state-cache
)
3358 ;; Note: Similar code in `c-safe-position'. The
3359 ;; difference is that we accept a safe position at
3360 ;; the point and don't bother to go forward past open
3363 (setq elem
(car paren-state
))
3365 (cond ((<= (cdr elem
) (point))
3366 (throw 'done
(cdr elem
)))
3367 ((<= (car elem
) (point))
3368 (throw 'done
(car elem
))))
3369 (if (<= elem
(point))
3370 (throw 'done elem
)))
3371 (setq paren-state
(cdr paren-state
)))
3374 (if (> pos
(- (point) 4000))
3376 ;; The position is far back. Try `c-beginning-of-defun-1'
3377 ;; (although we can't be entirely sure it will go to a position
3378 ;; outside a comment or string in current emacsen). FIXME:
3379 ;; Consult `syntax-ppss' here.
3380 (c-beginning-of-defun-1)
3385 ;; Tools for scanning identifiers and other tokens.
3387 (defun c-on-identifier ()
3388 "Return non-nil if the point is on or directly after an identifier.
3389 Keywords are recognized and not considered identifiers. If an
3390 identifier is detected, the returned value is its starting position.
3391 If an identifier ends at the point and another begins at it \(can only
3392 happen in Pike) then the point for the preceding one is returned.
3394 Note that this function might do hidden buffer changes. See the
3395 comment at the start of cc-engine.el for more info."
3397 ;; FIXME: Shouldn't this function handle "operator" in C++?
3400 (skip-syntax-backward "w_")
3404 ;; Check for a normal (non-keyword) identifier.
3405 (and (looking-at c-symbol-start
)
3406 (not (looking-at c-keywords-regexp
))
3409 (when (c-major-mode-is 'pike-mode
)
3410 ;; Handle the `<operator> syntax in Pike.
3411 (let ((pos (point)))
3412 (skip-chars-backward "-!%&*+/<=>^|~[]()")
3413 (and (if (< (skip-chars-backward "`") 0)
3416 (eq (char-after) ?\
`))
3417 (looking-at c-symbol-key
)
3418 (>= (match-end 0) pos
)
3421 ;; Handle the "operator +" syntax in C++.
3422 (when (and c-overloadable-operators-regexp
3423 (= (c-backward-token-2 0) 0))
3425 (cond ((and (looking-at c-overloadable-operators-regexp
)
3426 (or (not c-opt-op-identifier-prefix
)
3427 (and (= (c-backward-token-2 1) 0)
3428 (looking-at c-opt-op-identifier-prefix
))))
3432 (and c-opt-op-identifier-prefix
3433 (looking-at c-opt-op-identifier-prefix
)
3434 (= (c-forward-token-2 1) 0)
3435 (looking-at c-overloadable-operators-regexp
)))
3440 (defsubst c-simple-skip-symbol-backward
()
3441 ;; If the point is at the end of a symbol then skip backward to the
3442 ;; beginning of it. Don't move otherwise. Return non-nil if point
3445 ;; This function might do hidden buffer changes.
3446 (or (< (skip-syntax-backward "w_") 0)
3447 (and (c-major-mode-is 'pike-mode
)
3448 ;; Handle the `<operator> syntax in Pike.
3449 (let ((pos (point)))
3450 (if (and (< (skip-chars-backward "-!%&*+/<=>^|~[]()") 0)
3451 (< (skip-chars-backward "`") 0)
3452 (looking-at c-symbol-key
)
3453 (>= (match-end 0) pos
))
3458 (defun c-beginning-of-current-token (&optional back-limit
)
3459 ;; Move to the beginning of the current token. Do not move if not
3460 ;; in the middle of one. BACK-LIMIT may be used to bound the
3461 ;; backward search; if given it's assumed to be at the boundary
3462 ;; between two tokens. Return non-nil if the point is moved, nil
3465 ;; This function might do hidden buffer changes.
3466 (let ((start (point)))
3467 (if (looking-at "\\w\\|\\s_")
3468 (skip-syntax-backward "w_" back-limit
)
3469 (when (< (skip-syntax-backward ".()" back-limit
) 0)
3470 (while (let ((pos (or (and (looking-at c-nonsymbol-token-regexp
)
3472 ;; `c-nonsymbol-token-regexp' should always match
3473 ;; since we've skipped backward over punctuator
3474 ;; or paren syntax, but consume one char in case
3475 ;; it doesn't so that we don't leave point before
3476 ;; some earlier incorrect token.
3479 (goto-char pos
))))))
3482 (defun c-end-of-current-token (&optional back-limit
)
3483 ;; Move to the end of the current token. Do not move if not in the
3484 ;; middle of one. BACK-LIMIT may be used to bound the backward
3485 ;; search; if given it's assumed to be at the boundary between two
3486 ;; tokens. Return non-nil if the point is moved, nil otherwise.
3488 ;; This function might do hidden buffer changes.
3489 (let ((start (point)))
3490 (cond ((< (skip-syntax-backward "w_" (1- start
)) 0)
3491 (skip-syntax-forward "w_"))
3492 ((< (skip-syntax-backward ".()" back-limit
) 0)
3494 (if (looking-at c-nonsymbol-token-regexp
)
3495 (goto-char (match-end 0))
3496 ;; `c-nonsymbol-token-regexp' should always match since
3497 ;; we've skipped backward over punctuator or paren
3498 ;; syntax, but move forward in case it doesn't so that
3499 ;; we don't leave point earlier than we started with.
3501 (< (point) start
)))))
3504 (defconst c-jump-syntax-balanced
3505 (if (memq 'gen-string-delim c-emacs-features
)
3506 "\\w\\|\\s_\\|\\s\(\\|\\s\)\\|\\s\"\\|\\s|"
3507 "\\w\\|\\s_\\|\\s\(\\|\\s\)\\|\\s\""))
3509 (defconst c-jump-syntax-unbalanced
3510 (if (memq 'gen-string-delim c-emacs-features
)
3511 "\\w\\|\\s_\\|\\s\"\\|\\s|"
3512 "\\w\\|\\s_\\|\\s\""))
3514 (defun c-forward-token-2 (&optional count balanced limit
)
3515 "Move forward by tokens.
3516 A token is defined as all symbols and identifiers which aren't
3517 syntactic whitespace \(note that multicharacter tokens like \"==\" are
3518 treated properly). Point is always either left at the beginning of a
3519 token or not moved at all. COUNT specifies the number of tokens to
3520 move; a negative COUNT moves in the opposite direction. A COUNT of 0
3521 moves to the next token beginning only if not already at one. If
3522 BALANCED is true, move over balanced parens, otherwise move into them.
3523 Also, if BALANCED is true, never move out of an enclosing paren.
3525 LIMIT sets the limit for the movement and defaults to the point limit.
3526 The case when LIMIT is set in the middle of a token, comment or macro
3527 is handled correctly, i.e. the point won't be left there.
3529 Return the number of tokens left to move \(positive or negative). If
3530 BALANCED is true, a move over a balanced paren counts as one. Note
3531 that if COUNT is 0 and no appropriate token beginning is found, 1 will
3532 be returned. Thus, a return value of 0 guarantees that point is at
3533 the requested position and a return value less \(without signs) than
3534 COUNT guarantees that point is at the beginning of some token.
3536 Note that this function might do hidden buffer changes. See the
3537 comment at the start of cc-engine.el for more info."
3539 (or count
(setq count
1))
3541 (- (c-backward-token-2 (- count
) balanced limit
))
3543 (let ((jump-syntax (if balanced
3544 c-jump-syntax-balanced
3545 c-jump-syntax-unbalanced
))
3550 ;; If count is zero we should jump if in the middle of a token.
3551 (c-end-of-current-token))
3554 (if limit
(narrow-to-region (point-min) limit
))
3556 (progn (c-forward-syntactic-ws) (point)))
3557 ;; Skip whitespace. Count this as a move if we did in
3559 (setq count
(max (1- count
) 0)))
3562 ;; Moved out of bounds. Make sure the returned count isn't zero.
3564 (if (zerop count
) (setq count
1))
3567 ;; Use `condition-case' to avoid having the limit tests
3574 (cond ((looking-at jump-syntax
)
3575 (goto-char (scan-sexps (point) 1))
3577 ((looking-at c-nonsymbol-token-regexp
)
3578 (goto-char (match-end 0))
3580 ;; `c-nonsymbol-token-regexp' above should always
3581 ;; match if there are correct tokens. Try to
3582 ;; widen to see if the limit was set in the
3583 ;; middle of one, else fall back to treating
3584 ;; the offending thing as a one character token.
3588 (looking-at c-nonsymbol-token-regexp
)))
3593 (c-forward-syntactic-ws)
3596 (error (goto-char last
)))
3600 (setq count
(1+ count
)))))
3604 (defun c-backward-token-2 (&optional count balanced limit
)
3605 "Move backward by tokens.
3606 See `c-forward-token-2' for details."
3608 (or count
(setq count
1))
3610 (- (c-forward-token-2 (- count
) balanced limit
))
3612 (or limit
(setq limit
(point-min)))
3613 (let ((jump-syntax (if balanced
3614 c-jump-syntax-balanced
3615 c-jump-syntax-unbalanced
))
3619 ;; The count is zero so try to skip to the beginning of the
3622 (progn (c-beginning-of-current-token) (point)))
3623 (if (< (point) limit
)
3624 ;; The limit is inside the same token, so return 1.
3627 ;; We're not in the middle of a token. If there's
3628 ;; whitespace after the point then we must move backward,
3629 ;; so set count to 1 in that case.
3630 (and (looking-at c-syntactic-ws-start
)
3631 ;; If we're looking at a '#' that might start a cpp
3632 ;; directive then we have to do a more elaborate check.
3633 (or (/= (char-after) ?
#)
3634 (not c-opt-cpp-prefix
)
3637 (progn (beginning-of-line)
3638 (looking-at "[ \t]*")
3641 (progn (backward-char)
3642 (not (eq (char-before) ?
\\)))))))
3645 ;; Use `condition-case' to avoid having to check for buffer
3646 ;; limits in `backward-char', `scan-sexps' and `goto-char' below.
3651 (c-backward-syntactic-ws)
3653 (if (looking-at jump-syntax
)
3654 (goto-char (scan-sexps (1+ (point)) -
1))
3655 ;; This can be very inefficient if there's a long
3656 ;; sequence of operator tokens without any separation.
3657 ;; That doesn't happen in practice, anyway.
3658 (c-beginning-of-current-token))
3659 (>= (point) limit
)))
3662 (error (goto-char last
)))
3664 (if (< (point) limit
)
3669 (defun c-forward-token-1 (&optional count balanced limit
)
3670 "Like `c-forward-token-2' but doesn't treat multicharacter operator
3671 tokens like \"==\" as single tokens, i.e. all sequences of symbol
3672 characters are jumped over character by character. This function is
3673 for compatibility only; it's only a wrapper over `c-forward-token-2'."
3674 (let ((c-nonsymbol-token-regexp "\\s.\\|\\s\(\\|\\s\)"))
3675 (c-forward-token-2 count balanced limit
)))
3677 (defun c-backward-token-1 (&optional count balanced limit
)
3678 "Like `c-backward-token-2' but doesn't treat multicharacter operator
3679 tokens like \"==\" as single tokens, i.e. all sequences of symbol
3680 characters are jumped over character by character. This function is
3681 for compatibility only; it's only a wrapper over `c-backward-token-2'."
3682 (let ((c-nonsymbol-token-regexp "\\s.\\|\\s\(\\|\\s\)"))
3683 (c-backward-token-2 count balanced limit
)))
3686 ;; Tools for doing searches restricted to syntactically relevant text.
3688 (defun c-syntactic-re-search-forward (regexp &optional bound noerror
3689 paren-level not-inside-token
3690 lookbehind-submatch
)
3691 "Like `re-search-forward', but only report matches that are found
3692 in syntactically significant text. I.e. matches in comments, macros
3693 or string literals are ignored. The start point is assumed to be
3694 outside any comment, macro or string literal, or else the content of
3695 that region is taken as syntactically significant text.
3697 If PAREN-LEVEL is non-nil, an additional restriction is added to
3698 ignore matches in nested paren sexps. The search will also not go
3699 outside the current list sexp, which has the effect that if the point
3700 should be moved to BOUND when no match is found \(i.e. NOERROR is
3701 neither nil nor t), then it will be at the closing paren if the end of
3702 the current list sexp is encountered first.
3704 If NOT-INSIDE-TOKEN is non-nil, matches in the middle of tokens are
3705 ignored. Things like multicharacter operators and special symbols
3706 \(e.g. \"`()\" in Pike) are handled but currently not floating point
3709 If LOOKBEHIND-SUBMATCH is non-nil, it's taken as a number of a
3710 subexpression in REGEXP. The end of that submatch is used as the
3711 position to check for syntactic significance. If LOOKBEHIND-SUBMATCH
3712 isn't used or if that subexpression didn't match then the start
3713 position of the whole match is used instead. The \"look behind\"
3714 subexpression is never tested before the starting position, so it
3715 might be a good idea to include \\=\\= as a match alternative in it.
3717 Optimization note: Matches might be missed if the \"look behind\"
3718 subexpression can match the end of nonwhite syntactic whitespace,
3719 i.e. the end of comments or cpp directives. This since the function
3720 skips over such things before resuming the search. It's on the other
3721 hand not safe to assume that the \"look behind\" subexpression never
3722 matches syntactic whitespace.
3724 Bug: Unbalanced parens inside cpp directives are currently not handled
3725 correctly \(i.e. they don't get ignored as they should) when
3728 Note that this function might do hidden buffer changes. See the
3729 comment at the start of cc-engine.el for more info."
3731 (or bound
(setq bound
(point-max)))
3732 (if paren-level
(setq paren-level -
1))
3734 ;;(message "c-syntactic-re-search-forward %s %s %S" (point) bound regexp)
3736 (let ((start (point))
3738 ;; Start position for the last search.
3740 ;; The `parse-partial-sexp' state between the start position
3743 ;; The current position after the last state update. The next
3744 ;; `parse-partial-sexp' continues from here.
3746 ;; The position at which to check the state and the state
3747 ;; there. This is separate from `state-pos' since we might
3748 ;; need to back up before doing the next search round.
3749 check-pos check-state
3750 ;; Last position known to end a token.
3751 (last-token-end-pos (point-min))
3752 ;; Set when a valid match is found.
3759 (setq search-pos
(point))
3760 (re-search-forward regexp bound noerror
))
3763 (setq state
(parse-partial-sexp
3764 state-pos
(match-beginning 0) paren-level nil state
)
3766 (if (setq check-pos
(and lookbehind-submatch
3767 (or (not paren-level
)
3769 (match-end lookbehind-submatch
)))
3770 (setq check-state
(parse-partial-sexp
3771 state-pos check-pos paren-level nil state
))
3772 (setq check-pos state-pos
3775 ;; NOTE: If we got a look behind subexpression and get
3776 ;; an insignificant match in something that isn't
3777 ;; syntactic whitespace (i.e. strings or in nested
3778 ;; parentheses), then we can never skip more than a
3779 ;; single character from the match start position
3780 ;; (i.e. `state-pos' here) before continuing the
3781 ;; search. That since the look behind subexpression
3782 ;; might match the end of the insignificant region in
3786 ((elt check-state
7)
3787 ;; Match inside a line comment. Skip to eol. Use
3788 ;; `re-search-forward' instead of `skip-chars-forward' to get
3789 ;; the right bound behavior.
3790 (re-search-forward "[\n\r]" bound noerror
))
3792 ((elt check-state
4)
3793 ;; Match inside a block comment. Skip to the '*/'.
3794 (search-forward "*/" bound noerror
))
3796 ((and (not (elt check-state
5))
3797 (eq (char-before check-pos
) ?
/)
3798 (not (c-get-char-property (1- check-pos
) 'syntax-table
))
3799 (memq (char-after check-pos
) '(?
/ ?
*)))
3800 ;; Match in the middle of the opener of a block or line
3802 (if (= (char-after check-pos
) ?
/)
3803 (re-search-forward "[\n\r]" bound noerror
)
3804 (search-forward "*/" bound noerror
)))
3806 ;; The last `parse-partial-sexp' above might have
3807 ;; stopped short of the real check position if the end
3808 ;; of the current sexp was encountered in paren-level
3809 ;; mode. The checks above are always false in that
3810 ;; case, and since they can do better skipping in
3811 ;; lookbehind-submatch mode, we do them before
3812 ;; checking the paren level.
3815 (/= (setq tmp
(car check-state
)) 0))
3816 ;; Check the paren level first since we're short of the
3817 ;; syntactic checking position if the end of the
3818 ;; current sexp was encountered by `parse-partial-sexp'.
3821 ;; Inside a nested paren sexp.
3822 (if lookbehind-submatch
3823 ;; See the NOTE above.
3824 (progn (goto-char state-pos
) t
)
3825 ;; Skip out of the paren quickly.
3826 (setq state
(parse-partial-sexp state-pos bound
0 nil state
)
3829 ;; Have exited the current paren sexp.
3832 ;; The last `parse-partial-sexp' call above
3833 ;; has left us just after the closing paren
3834 ;; in this case, so we can modify the bound
3835 ;; to leave the point at the right position
3837 (setq bound
(1- (point)))
3839 (signal 'search-failed
(list regexp
)))))
3841 ((setq tmp
(elt check-state
3))
3842 ;; Match inside a string.
3843 (if (or lookbehind-submatch
3844 (not (integerp tmp
)))
3845 ;; See the NOTE above.
3846 (progn (goto-char state-pos
) t
)
3847 ;; Skip to the end of the string before continuing.
3848 (let ((ender (make-string 1 tmp
)) (continue t
))
3849 (while (if (search-forward ender bound noerror
)
3851 (setq state
(parse-partial-sexp
3852 state-pos
(point) nil nil state
)
3855 (setq continue nil
)))
3860 (c-beginning-of-macro start
)))
3861 ;; Match inside a macro. Skip to the end of it.
3863 (cond ((<= (point) bound
) t
)
3865 (t (signal 'search-failed
(list regexp
)))))
3867 ((and not-inside-token
3868 (or (< check-pos last-token-end-pos
)
3871 (goto-char check-pos
)
3873 (c-end-of-current-token last-token-end-pos
))
3874 (setq last-token-end-pos
(point))))))
3876 (if lookbehind-submatch
3877 ;; See the NOTE above.
3878 (goto-char state-pos
)
3879 (goto-char (min last-token-end-pos bound
))))
3886 ;; Should loop to search again, but take care to avoid
3887 ;; looping on the same spot.
3888 (or (/= search-pos
(point))
3889 (if (= (point) bound
)
3892 (signal 'search-failed
(list regexp
)))
3898 (signal (car err
) (cdr err
))))
3900 ;;(message "c-syntactic-re-search-forward done %s" (or (match-end 0) (point)))
3904 (goto-char (match-end 0))
3907 ;; Search failed. Set point as appropriate.
3913 (defvar safe-pos-list
) ; bound in c-syntactic-skip-backward
3915 (defsubst c-ssb-lit-begin
()
3916 ;; Return the start of the literal point is in, or nil.
3917 ;; We read and write the variables `safe-pos', `safe-pos-list', `state'
3918 ;; bound in the caller.
3920 ;; Use `parse-partial-sexp' from a safe position down to the point to check
3921 ;; if it's outside comments and strings.
3923 (let ((pos (point)) safe-pos state pps-end-pos
)
3924 ;; Pick a safe position as close to the point as possible.
3926 ;; FIXME: Consult `syntax-ppss' here if our cache doesn't give a good
3929 (while (and safe-pos-list
3930 (> (car safe-pos-list
) (point)))
3931 (setq safe-pos-list
(cdr safe-pos-list
)))
3932 (unless (setq safe-pos
(car-safe safe-pos-list
))
3933 (setq safe-pos
(max (or (c-safe-position
3934 (point) (or c-state-cache
3938 safe-pos-list
(list safe-pos
)))
3940 ;; Cache positions along the way to use if we have to back up more. We
3941 ;; cache every closing paren on the same level. If the paren cache is
3942 ;; relevant in this region then we're typically already on the same
3943 ;; level as the target position. Note that we might cache positions
3944 ;; after opening parens in case safe-pos is in a nested list. That's
3945 ;; both uncommon and harmless.
3947 (setq state
(parse-partial-sexp
3950 (setq safe-pos
(point)
3951 safe-pos-list
(cons safe-pos safe-pos-list
)))
3953 ;; If the state contains the start of the containing sexp we cache that
3954 ;; position too, so that parse-partial-sexp in the next run has a bigger
3955 ;; chance of starting at the same level as the target position and thus
3956 ;; will get more good safe positions into the list.
3958 (setq safe-pos
(1+ (elt state
1))
3959 safe-pos-list
(cons safe-pos safe-pos-list
)))
3961 (if (or (elt state
3) (elt state
4))
3962 ;; Inside string or comment. Continue search at the
3966 (defun c-syntactic-skip-backward (skip-chars &optional limit paren-level
)
3967 "Like `skip-chars-backward' but only look at syntactically relevant chars,
3968 i.e. don't stop at positions inside syntactic whitespace or string
3969 literals. Preprocessor directives are also ignored, with the exception
3970 of the one that the point starts within, if any. If LIMIT is given,
3971 it's assumed to be at a syntactically relevant position.
3973 If PAREN-LEVEL is non-nil, the function won't stop in nested paren
3974 sexps, and the search will also not go outside the current paren sexp.
3975 However, if LIMIT or the buffer limit is reached inside a nested paren
3976 then the point will be left at the limit.
3978 Non-nil is returned if the point moved, nil otherwise.
3980 Note that this function might do hidden buffer changes. See the
3981 comment at the start of cc-engine.el for more info."
3983 (let ((start (point))
3985 ;; A list of syntactically relevant positions in descending
3986 ;; order. It's used to avoid scanning repeatedly over
3987 ;; potentially large regions with `parse-partial-sexp' to verify
3988 ;; each position. Used in `c-ssb-lit-begin'
3990 ;; The result from `c-beginning-of-macro' at the start position or the
3991 ;; start position itself if it isn't within a macro. Evaluated on
3994 ;; The earliest position after the current one with the same paren
3995 ;; level. Used only when `paren-level' is set.
3997 (paren-level-pos (point)))
4001 ;; The next loop "tries" to find the end point each time round,
4002 ;; loops when it hasn't succeeded.
4005 (< (skip-chars-backward skip-chars limit
) 0)
4007 (let ((pos (point)) state-2 pps-end-pos
)
4010 ;; Don't stop inside a literal
4011 ((setq lit-beg
(c-ssb-lit-begin))
4017 (setq state-2
(parse-partial-sexp
4018 pos paren-level-pos -
1)
4019 pps-end-pos
(point))
4020 (/= (car state-2
) 0)))
4021 ;; Not at the right level.
4023 (if (and (< (car state-2
) 0)
4024 ;; We stop above if we go out of a paren.
4025 ;; Now check whether it precedes or is
4026 ;; nested in the starting sexp.
4030 pps-end-pos paren-level-pos
4032 (< (car state-2
) 0)))
4034 ;; We've stopped short of the starting position
4035 ;; so the hit was inside a nested list. Go up
4036 ;; until we are at the right level.
4039 (goto-char (scan-lists pos -
1
4041 (setq paren-level-pos
(point))
4042 (if (and limit
(>= limit paren-level-pos
))
4048 (goto-char (or limit
(point-min)))
4051 ;; The hit was outside the list at the start
4052 ;; position. Go to the start of the list and exit.
4053 (goto-char (1+ (elt state-2
1)))
4056 ((c-beginning-of-macro limit
)
4060 (setq start-macro-beg
4063 (c-beginning-of-macro limit
)
4067 ;; It's inside the same macro we started in so it's
4068 ;; a relevant match.
4074 ;; Skip syntactic ws afterwards so that we don't stop at the
4075 ;; end of a comment if `skip-chars' is something like "^/".
4076 (c-backward-syntactic-ws)
4079 ;; We might want to extend this with more useful return values in
4081 (/= (point) start
)))
4083 ;; The following is an alternative implementation of
4084 ;; `c-syntactic-skip-backward' that uses backward movement to keep
4085 ;; track of the syntactic context. It turned out to be generally
4086 ;; slower than the one above which uses forward checks from earlier
4089 ;;(defconst c-ssb-stop-re
4090 ;; ;; The regexp matching chars `c-syntactic-skip-backward' needs to
4091 ;; ;; stop at to avoid going into comments and literals.
4093 ;; ;; Match comment end syntax and string literal syntax. Also match
4094 ;; ;; '/' for block comment endings (not covered by comment end
4096 ;; "\\s>\\|/\\|\\s\""
4097 ;; (if (memq 'gen-string-delim c-emacs-features)
4100 ;; (if (memq 'gen-comment-delim c-emacs-features)
4104 ;;(defconst c-ssb-stop-paren-re
4105 ;; ;; Like `c-ssb-stop-re' but also stops at paren chars.
4106 ;; (concat c-ssb-stop-re "\\|\\s(\\|\\s)"))
4108 ;;(defconst c-ssb-sexp-end-re
4109 ;; ;; Regexp matching the ending syntax of a complex sexp.
4110 ;; (concat c-string-limit-regexp "\\|\\s)"))
4112 ;;(defun c-syntactic-skip-backward (skip-chars &optional limit paren-level)
4113 ;; "Like `skip-chars-backward' but only look at syntactically relevant chars,
4114 ;;i.e. don't stop at positions inside syntactic whitespace or string
4115 ;;literals. Preprocessor directives are also ignored. However, if the
4116 ;;point is within a comment, string literal or preprocessor directory to
4117 ;;begin with, its contents is treated as syntactically relevant chars.
4118 ;;If LIMIT is given, it limits the backward search and the point will be
4119 ;;left there if no earlier position is found.
4121 ;;If PAREN-LEVEL is non-nil, the function won't stop in nested paren
4122 ;;sexps, and the search will also not go outside the current paren sexp.
4123 ;;However, if LIMIT or the buffer limit is reached inside a nested paren
4124 ;;then the point will be left at the limit.
4126 ;;Non-nil is returned if the point moved, nil otherwise.
4128 ;;Note that this function might do hidden buffer changes. See the
4129 ;;comment at the start of cc-engine.el for more info."
4131 ;; (save-restriction
4133 ;; (narrow-to-region limit (point-max)))
4135 ;; (let ((start (point)))
4137 ;; (while (let ((last-pos (point))
4139 ;; (skip-chars-backward skip-chars)
4142 ;; ;; Skip back over the same region as
4143 ;; ;; `skip-chars-backward' above, but keep to
4144 ;; ;; syntactically relevant positions.
4145 ;; (goto-char last-pos)
4147 ;; ;; `re-search-backward' with a single char regexp
4148 ;; ;; should be fast.
4149 ;; (re-search-backward
4150 ;; (if paren-level c-ssb-stop-paren-re c-ssb-stop-re)
4155 ;; ((looking-at "\\s(")
4156 ;; ;; `paren-level' is set and we've found the
4157 ;; ;; start of the containing paren.
4161 ;; ((looking-at c-ssb-sexp-end-re)
4162 ;; ;; We're at the end of a string literal or paren
4163 ;; ;; sexp (if `paren-level' is set).
4165 ;; (condition-case nil
4166 ;; (c-backward-sexp)
4168 ;; (goto-char limit)
4169 ;; (throw 'done t))))
4173 ;; ;; At the end of some syntactic ws or possibly
4174 ;; ;; after a plain '/' operator.
4175 ;; (let ((pos (point)))
4176 ;; (c-backward-syntactic-ws)
4177 ;; (if (= pos (point))
4178 ;; ;; Was a plain '/' operator. Go past it.
4179 ;; (backward-char)))))
4181 ;; (> (point) stop-pos))))
4183 ;; ;; Now the point is either at `stop-pos' or at some
4184 ;; ;; position further back if `stop-pos' was at a
4185 ;; ;; syntactically irrelevant place.
4187 ;; ;; Skip additional syntactic ws so that we don't stop
4188 ;; ;; at the end of a comment if `skip-chars' is
4189 ;; ;; something like "^/".
4190 ;; (c-backward-syntactic-ws)
4192 ;; (< (point) stop-pos))))
4194 ;; ;; We might want to extend this with more useful return values
4195 ;; ;; in the future.
4196 ;; (/= (point) start))))
4199 ;; Tools for handling comments and string literals.
4201 (defun c-in-literal (&optional lim detect-cpp
)
4202 "Return the type of literal point is in, if any.
4203 The return value is `c' if in a C-style comment, `c++' if in a C++
4204 style comment, `string' if in a string literal, `pound' if DETECT-CPP
4205 is non-nil and in a preprocessor line, or nil if somewhere else.
4206 Optional LIM is used as the backward limit of the search. If omitted,
4207 or nil, `c-beginning-of-defun' is used.
4209 The last point calculated is cached if the cache is enabled, i.e. if
4210 `c-in-literal-cache' is bound to a two element vector.
4212 Note that this function might do hidden buffer changes. See the
4213 comment at the start of cc-engine.el for more info."
4214 (let* ((safe-place (c-state-safe-place (point)))
4215 (lit (c-state-pp-to-literal safe-place
(point))))
4218 (save-excursion (c-beginning-of-macro))
4221 (defun c-literal-limits (&optional lim near not-in-delimiter
)
4222 "Return a cons of the beginning and end positions of the comment or
4223 string surrounding point (including both delimiters), or nil if point
4224 isn't in one. If LIM is non-nil, it's used as the \"safe\" position
4225 to start parsing from. If NEAR is non-nil, then the limits of any
4226 literal next to point is returned. \"Next to\" means there's only
4227 spaces and tabs between point and the literal. The search for such a
4228 literal is done first in forward direction. If NOT-IN-DELIMITER is
4229 non-nil, the case when point is inside a starting delimiter won't be
4230 recognized. This only has effect for comments which have starting
4231 delimiters with more than one character.
4233 Note that this function might do hidden buffer changes. See the
4234 comment at the start of cc-engine.el for more info."
4237 (let* ((pos (point))
4238 (lim (or lim
(c-state-safe-place pos
)))
4239 (pp-to-lit (c-state-pp-to-literal lim pos
))
4240 (state (car pp-to-lit
))
4241 (lit-type (cadr pp-to-lit
))
4242 (lit-limits (car (cddr pp-to-lit
))))
4246 ((and (not not-in-delimiter
)
4248 (eq (char-before) ?
/)
4249 (looking-at "[/*]")) ; FIXME!!! use c-line/block-comment-starter. 2008-09-28.
4250 ;; We're standing in a comment starter.
4252 (cons (point) (progn (c-forward-single-comment) (point))))
4256 ;; Search forward for a literal.
4257 (skip-chars-forward " \t")
4259 ((looking-at c-string-limit-regexp
) ; String.
4260 (cons (point) (or (c-safe (c-forward-sexp 1) (point))
4263 ((looking-at c-comment-start-regexp
) ; Line or block comment.
4264 (cons (point) (progn (c-forward-single-comment) (point))))
4268 (skip-chars-backward " \t")
4270 (let ((end (point)) beg
)
4273 (< (skip-syntax-backward c-string-syntax
) 0)) ; String.
4274 (setq beg
(c-safe (c-backward-sexp 1) (point))))
4276 ((and (c-safe (forward-char -
2) t
)
4278 ;; Block comment. Due to the nature of line
4279 ;; comments, they will always be covered by the
4280 ;; normal case above.
4282 (c-backward-single-comment)
4283 ;; If LIM is bogus, beg will be bogus.
4284 (setq beg
(point))))
4286 (if beg
(cons beg end
))))))
4289 ;; In case external callers use this; it did have a docstring.
4290 (defalias 'c-literal-limits-fast
'c-literal-limits
)
4292 (defun c-collect-line-comments (range)
4293 "If the argument is a cons of two buffer positions (such as returned by
4294 `c-literal-limits'), and that range contains a C++ style line comment,
4295 then an extended range is returned that contains all adjacent line
4296 comments (i.e. all comments that starts in the same column with no
4297 empty lines or non-whitespace characters between them). Otherwise the
4298 argument is returned.
4300 Note that this function might do hidden buffer changes. See the
4301 comment at the start of cc-engine.el for more info."
4305 (if (and (consp range
) (progn
4306 (goto-char (car range
))
4307 (looking-at c-line-comment-starter
)))
4308 (let ((col (current-column))
4310 (bopl (c-point 'bopl
))
4312 ;; Got to take care in the backward direction to handle
4313 ;; comments which are preceded by code.
4314 (while (and (c-backward-single-comment)
4316 (looking-at c-line-comment-starter
)
4317 (= col
(current-column)))
4319 bopl
(c-point 'bopl
)))
4321 (while (and (progn (skip-chars-forward " \t")
4322 (looking-at c-line-comment-starter
))
4323 (= col
(current-column))
4324 (prog1 (zerop (forward-line 1))
4325 (setq end
(point)))))
4330 (defun c-literal-type (range)
4331 "Convenience function that given the result of `c-literal-limits',
4332 returns nil or the type of literal that the range surrounds, one
4333 of the symbols 'c, 'c++ or 'string. It's much faster than using
4334 `c-in-literal' and is intended to be used when you need both the
4335 type of a literal and its limits.
4337 Note that this function might do hidden buffer changes. See the
4338 comment at the start of cc-engine.el for more info."
4342 (goto-char (car range
))
4343 (cond ((looking-at c-string-limit-regexp
) 'string
)
4344 ((or (looking-at "//") ; c++ line comment
4345 (and (looking-at "\\s<") ; comment starter
4346 (looking-at "#"))) ; awk comment.
4348 (t 'c
))) ; Assuming the range is valid.
4352 ;; `c-find-decl-spots' and accompanying stuff.
4354 ;; Variables used in `c-find-decl-spots' to cache the search done for
4355 ;; the first declaration in the last call. When that function starts,
4356 ;; it needs to back up over syntactic whitespace to look at the last
4357 ;; token before the region being searched. That can sometimes cause
4358 ;; moves back and forth over a quite large region of comments and
4359 ;; macros, which would be repeated for each changed character when
4360 ;; we're called during fontification, since font-lock refontifies the
4361 ;; current line for each change. Thus it's worthwhile to cache the
4364 ;; `c-find-decl-syntactic-pos' is a syntactically relevant position in
4365 ;; the syntactic whitespace less or equal to some start position.
4366 ;; There's no cached value if it's nil.
4368 ;; `c-find-decl-match-pos' is the match position if
4369 ;; `c-find-decl-prefix-search' matched before the syntactic whitespace
4370 ;; at `c-find-decl-syntactic-pos', or nil if there's no such match.
4371 (defvar c-find-decl-syntactic-pos nil
)
4372 (make-variable-buffer-local 'c-find-decl-syntactic-pos
)
4373 (defvar c-find-decl-match-pos nil
)
4374 (make-variable-buffer-local 'c-find-decl-match-pos
)
4376 (defsubst c-invalidate-find-decl-cache
(change-min-pos)
4377 (and c-find-decl-syntactic-pos
4378 (< change-min-pos c-find-decl-syntactic-pos
)
4379 (setq c-find-decl-syntactic-pos nil
)))
4381 ; (defface c-debug-decl-spot-face
4382 ; '((t (:background "Turquoise")))
4383 ; "Debug face to mark the spots where `c-find-decl-spots' stopped.")
4384 ; (defface c-debug-decl-sws-face
4385 ; '((t (:background "Khaki")))
4386 ; "Debug face to mark the syntactic whitespace between the declaration
4387 ; spots and the preceding token end.")
4389 (defmacro c-debug-put-decl-spot-faces
(match-pos decl-pos
)
4390 (when (facep 'c-debug-decl-spot-face
)
4391 `(c-save-buffer-state ((match-pos ,match-pos
) (decl-pos ,decl-pos
))
4392 (c-debug-add-face (max match-pos
(point-min)) decl-pos
4393 'c-debug-decl-sws-face
)
4394 (c-debug-add-face decl-pos
(min (1+ decl-pos
) (point-max))
4395 'c-debug-decl-spot-face
))))
4396 (defmacro c-debug-remove-decl-spot-faces
(beg end
)
4397 (when (facep 'c-debug-decl-spot-face
)
4398 `(c-save-buffer-state ()
4399 (c-debug-remove-face ,beg
,end
'c-debug-decl-spot-face
)
4400 (c-debug-remove-face ,beg
,end
'c-debug-decl-sws-face
))))
4402 (defmacro c-find-decl-prefix-search
()
4403 ;; Macro used inside `c-find-decl-spots'. It ought to be a defun,
4404 ;; but it contains lots of free variables that refer to things
4405 ;; inside `c-find-decl-spots'. The point is left at `cfd-match-pos'
4406 ;; if there is a match, otherwise at `cfd-limit'.
4408 ;; This macro might do hidden buffer changes.
4411 ;; Find the next property match position if we haven't got one already.
4412 (unless cfd-prop-match
4415 (goto-char (next-single-property-change
4416 (point) 'c-type nil cfd-limit
))
4417 (and (< (point) cfd-limit
)
4418 (not (eq (c-get-char-property (1- (point)) 'c-type
)
4420 (setq cfd-prop-match
(point))))
4422 ;; Find the next `c-decl-prefix-or-start-re' match if we haven't
4424 (unless cfd-re-match
4426 (if (> cfd-re-match-end
(point))
4427 (goto-char cfd-re-match-end
))
4429 (while (if (setq cfd-re-match-end
4430 (re-search-forward c-decl-prefix-or-start-re
4433 ;; Match. Check if it's inside a comment or string literal.
4435 (if (setq cfd-re-match
(match-end 1))
4436 ;; Matched the end of a token preceding a decl spot.
4438 (goto-char cfd-re-match
)
4440 ;; Matched a token that start a decl spot.
4441 (goto-char (match-beginning 0))
4445 ;; No match. Finish up and exit the loop.
4446 (setq cfd-re-match cfd-limit
)
4449 ;; Skip out of comments and string literals.
4451 (goto-char (next-single-property-change
4452 (point) 'face nil cfd-limit
))
4453 (and (< (point) cfd-limit
)
4454 (c-got-face-at (point) c-literal-faces
)))))
4456 ;; If we matched at the decl start, we have to back up over the
4457 ;; preceding syntactic ws to set `cfd-match-pos' and to catch
4458 ;; any decl spots in the syntactic ws.
4459 (unless cfd-re-match
4460 (c-backward-syntactic-ws)
4461 (setq cfd-re-match
(point))))
4463 ;; Choose whichever match is closer to the start.
4464 (if (< cfd-re-match cfd-prop-match
)
4465 (setq cfd-match-pos cfd-re-match
4467 (setq cfd-match-pos cfd-prop-match
4468 cfd-prop-match nil
))
4470 (goto-char cfd-match-pos
)
4472 (when (< cfd-match-pos cfd-limit
)
4473 ;; Skip forward past comments only so we don't skip macros.
4474 (c-forward-comments)
4475 ;; Set the position to continue at. We can avoid going over
4476 ;; the comments skipped above a second time, but it's possible
4477 ;; that the comment skipping has taken us past `cfd-prop-match'
4478 ;; since the property might be used inside comments.
4479 (setq cfd-continue-pos
(if cfd-prop-match
4480 (min cfd-prop-match
(point))
4483 (defun c-find-decl-spots (cfd-limit cfd-decl-re cfd-face-checklist cfd-fun
)
4484 ;; Call CFD-FUN for each possible spot for a declaration, cast or
4485 ;; label from the point to CFD-LIMIT.
4487 ;; CFD-FUN is called with point at the start of the spot. It's
4488 ;; passed two arguments: The first is the end position of the token
4489 ;; preceding the spot, or 0 for the implicit match at bob. The
4490 ;; second is a flag that is t when the match is inside a macro. If
4491 ;; CFD-FUN adds `c-decl-end' properties somewhere below the current
4492 ;; spot, it should return non-nil to ensure that the next search
4496 ;; o The first token after bob.
4497 ;; o The first token after the end of submatch 1 in
4498 ;; `c-decl-prefix-or-start-re' when that submatch matches.
4499 ;; o The start of each `c-decl-prefix-or-start-re' match when
4500 ;; submatch 1 doesn't match.
4501 ;; o The first token after the end of each occurrence of the
4502 ;; `c-type' text property with the value `c-decl-end', provided
4503 ;; `c-type-decl-end-used' is set.
4505 ;; Only a spot that match CFD-DECL-RE and whose face is in the
4506 ;; CFD-FACE-CHECKLIST list causes CFD-FUN to be called. The face
4507 ;; check is disabled if CFD-FACE-CHECKLIST is nil.
4509 ;; If the match is inside a macro then the buffer is narrowed to the
4510 ;; end of it, so that CFD-FUN can investigate the following tokens
4511 ;; without matching something that begins inside a macro and ends
4512 ;; outside it. It's to avoid this work that the CFD-DECL-RE and
4513 ;; CFD-FACE-CHECKLIST checks exist.
4515 ;; The spots are visited approximately in order from top to bottom.
4516 ;; It's however the positions where `c-decl-prefix-or-start-re'
4517 ;; matches and where `c-decl-end' properties are found that are in
4518 ;; order. Since the spots often are at the following token, they
4519 ;; might be visited out of order insofar as more spots are reported
4520 ;; later on within the syntactic whitespace between the match
4521 ;; positions and their spots.
4523 ;; It's assumed that comments and strings are fontified in the
4526 ;; This is mainly used in fontification, and so has an elaborate
4527 ;; cache to handle repeated calls from the same start position; see
4528 ;; the variables above.
4530 ;; All variables in this function begin with `cfd-' to avoid name
4531 ;; collision with the (dynamically bound) variables used in CFD-FUN.
4533 ;; This function might do hidden buffer changes.
4535 (let ((cfd-start-pos (point))
4536 (cfd-buffer-end (point-max))
4537 ;; The end of the token preceding the decl spot last found
4538 ;; with `c-decl-prefix-or-start-re'. `cfd-limit' if there's
4541 ;; The end position of the last `c-decl-prefix-or-start-re'
4542 ;; match. If this is greater than `cfd-continue-pos', the
4543 ;; next regexp search is started here instead.
4544 (cfd-re-match-end (point-min))
4545 ;; The end of the last `c-decl-end' found by
4546 ;; `c-find-decl-prefix-search'. `cfd-limit' if there's no
4547 ;; match. If searching for the property isn't needed then we
4548 ;; disable it by setting it to `cfd-limit' directly.
4549 (cfd-prop-match (unless c-type-decl-end-used cfd-limit
))
4550 ;; The end of the token preceding the decl spot last found by
4551 ;; `c-find-decl-prefix-search'. 0 for the implicit match at
4552 ;; bob. `cfd-limit' if there's no match. In other words,
4553 ;; this is the minimum of `cfd-re-match' and `cfd-prop-match'.
4554 (cfd-match-pos cfd-limit
)
4555 ;; The position to continue searching at.
4557 ;; The position of the last "real" token we've stopped at.
4558 ;; This can be greater than `cfd-continue-pos' when we get
4559 ;; hits inside macros or at `c-decl-end' positions inside
4562 ;; The end position of the last entered macro.
4565 ;; Initialize by finding a syntactically relevant start position
4566 ;; before the point, and do the first `c-decl-prefix-or-start-re'
4567 ;; search unless we're at bob.
4569 (let (start-in-literal start-in-macro syntactic-pos
)
4570 ;; Must back up a bit since we look for the end of the previous
4571 ;; statement or declaration, which is earlier than the first
4575 ;; First we need to move to a syntactically relevant position.
4576 ;; Begin by backing out of comment or string literals.
4578 (when (c-got-face-at (point) c-literal-faces
)
4579 ;; Try to use the faces to back up to the start of the
4580 ;; literal. FIXME: What if the point is on a declaration
4581 ;; inside a comment?
4582 (while (and (not (bobp))
4583 (c-got-face-at (1- (point)) c-literal-faces
))
4584 (goto-char (previous-single-property-change
4585 (point) 'face nil
(point-min))))
4587 ;; XEmacs doesn't fontify the quotes surrounding string
4589 (and (featurep 'xemacs
)
4590 (eq (get-text-property (point) 'face
)
4591 'font-lock-string-face
)
4593 (progn (backward-char)
4594 (not (looking-at c-string-limit-regexp
)))
4597 ;; Don't trust the literal to contain only literal faces
4598 ;; (the font lock package might not have fontified the
4599 ;; start of it at all, for instance) so check that we have
4600 ;; arrived at something that looks like a start or else
4601 ;; resort to `c-literal-limits'.
4602 (unless (looking-at c-literal-start-regexp
)
4603 (let ((range (c-literal-limits)))
4604 (if range
(goto-char (car range
)))))
4606 (setq start-in-literal
(point)))
4608 ;; The start is in a literal. If the limit is in the same
4609 ;; one we don't have to find a syntactic position etc. We
4610 ;; only check that if the limit is at or before bonl to save
4611 ;; time; it covers the by far most common case when font-lock
4612 ;; refontifies the current line only.
4613 (<= cfd-limit
(c-point 'bonl cfd-start-pos
))
4615 (goto-char cfd-start-pos
)
4617 (goto-char (next-single-property-change
4618 (point) 'face nil cfd-limit
))
4619 (and (< (point) cfd-limit
)
4620 (c-got-face-at (point) c-literal-faces
))))
4621 (= (point) cfd-limit
)))
4623 ;; Completely inside a literal. Set up variables to trig the
4624 ;; (< cfd-continue-pos cfd-start-pos) case below and it'll
4625 ;; find a suitable start position.
4626 (setq cfd-continue-pos start-in-literal
))
4628 ;; Check if the region might be completely inside a macro, to
4629 ;; optimize that like the completely-inside-literal above.
4631 (and (= (forward-line 1) 0)
4632 (bolp) ; forward-line has funny behavior at eob.
4633 (>= (point) cfd-limit
)
4634 (progn (backward-char)
4635 (eq (char-before) ?
\\))))
4636 ;; (Maybe) completely inside a macro. Only need to trig the
4637 ;; (< cfd-continue-pos cfd-start-pos) case below to make it
4639 (setq cfd-continue-pos
(1- cfd-start-pos
)
4643 ;; Back out of any macro so we don't miss any declaration
4644 ;; that could follow after it.
4645 (when (c-beginning-of-macro)
4646 (setq start-in-macro t
))
4648 ;; Now we're at a proper syntactically relevant position so we
4649 ;; can use the cache. But first clear it if it applied
4651 (c-invalidate-find-decl-cache cfd-start-pos
)
4653 (setq syntactic-pos
(point))
4654 (unless (eq syntactic-pos c-find-decl-syntactic-pos
)
4655 ;; Don't have to do this if the cache is relevant here,
4656 ;; typically if the same line is refontified again. If
4657 ;; we're just some syntactic whitespace further down we can
4658 ;; still use the cache to limit the skipping.
4659 (c-backward-syntactic-ws c-find-decl-syntactic-pos
))
4661 ;; If we hit `c-find-decl-syntactic-pos' and
4662 ;; `c-find-decl-match-pos' is set then we install the cached
4663 ;; values. If we hit `c-find-decl-syntactic-pos' and
4664 ;; `c-find-decl-match-pos' is nil then we know there's no decl
4665 ;; prefix in the whitespace before `c-find-decl-syntactic-pos'
4666 ;; and so we can continue the search from this point. If we
4667 ;; didn't hit `c-find-decl-syntactic-pos' then we're now in
4668 ;; the right spot to begin searching anyway.
4669 (if (and (eq (point) c-find-decl-syntactic-pos
)
4670 c-find-decl-match-pos
)
4671 (setq cfd-match-pos c-find-decl-match-pos
4672 cfd-continue-pos syntactic-pos
)
4674 (setq c-find-decl-syntactic-pos syntactic-pos
)
4677 ;; Always consider bob a match to get the first
4678 ;; declaration in the file. Do this separately instead of
4679 ;; letting `c-decl-prefix-or-start-re' match bob, so that
4680 ;; regexp always can consume at least one character to
4681 ;; ensure that we won't get stuck in an infinite loop.
4682 (setq cfd-re-match
0)
4684 (c-beginning-of-current-token)
4685 (< (point) cfd-limit
))
4686 ;; Do an initial search now. In the bob case above it's
4687 ;; only done to search for a `c-decl-end' spot.
4688 (c-find-decl-prefix-search))
4690 (setq c-find-decl-match-pos
(and (< cfd-match-pos cfd-start-pos
)
4693 ;; Advance `cfd-continue-pos' if it's before the start position.
4694 ;; The closest continue position that might have effect at or
4695 ;; after the start depends on what we started in. This also
4696 ;; finds a suitable start position in the special cases when the
4697 ;; region is completely within a literal or macro.
4698 (when (and cfd-continue-pos
(< cfd-continue-pos cfd-start-pos
))
4702 ;; If we're in a macro then it's the closest preceding token
4703 ;; in the macro. Check this before `start-in-literal',
4704 ;; since if we're inside a literal in a macro, the preceding
4705 ;; token is earlier than any `c-decl-end' spot inside the
4706 ;; literal (comment).
4707 (goto-char (or start-in-literal cfd-start-pos
))
4708 ;; The only syntactic ws in macros are comments.
4709 (c-backward-comments)
4711 (c-beginning-of-current-token))
4714 ;; If we're in a comment it can only be the closest
4715 ;; preceding `c-decl-end' position within that comment, if
4716 ;; any. Go back to the beginning of such a property so that
4717 ;; `c-find-decl-prefix-search' will find the end of it.
4718 ;; (Can't stop at the end and install it directly on
4719 ;; `cfd-prop-match' since that variable might be cleared
4720 ;; after `cfd-fun' below.)
4722 ;; Note that if the literal is a string then the property
4723 ;; search will simply skip to the beginning of it right
4725 (if (not c-type-decl-end-used
)
4726 (goto-char start-in-literal
)
4727 (goto-char cfd-start-pos
)
4729 (goto-char (previous-single-property-change
4730 (point) 'c-type nil start-in-literal
))
4731 (and (> (point) start-in-literal
)
4732 (not (eq (c-get-char-property (point) 'c-type
)
4735 (when (= (point) start-in-literal
)
4736 ;; Didn't find any property inside the comment, so we can
4737 ;; skip it entirely. (This won't skip past a string, but
4738 ;; that'll be handled quickly by the next
4739 ;; `c-find-decl-prefix-search' anyway.)
4740 (c-forward-single-comment)
4741 (if (> (point) cfd-limit
)
4742 (goto-char cfd-limit
))))
4745 ;; If we started in normal code, the only match that might
4746 ;; apply before the start is what we already got in
4747 ;; `cfd-match-pos' so we can continue at the start position.
4748 ;; (Note that we don't get here if the first match is below
4750 (goto-char cfd-start-pos
)))
4752 ;; Delete found matches if they are before our new continue
4753 ;; position, so that `c-find-decl-prefix-search' won't back up
4754 ;; to them later on.
4755 (setq cfd-continue-pos
(point))
4756 (when (and cfd-re-match
(< cfd-re-match cfd-continue-pos
))
4757 (setq cfd-re-match nil
))
4758 (when (and cfd-prop-match
(< cfd-prop-match cfd-continue-pos
))
4759 (setq cfd-prop-match nil
)))
4762 ;; This is the normal case and we got a proper syntactic
4763 ;; position. If there's a match then it's always outside
4764 ;; macros and comments, so advance to the next token and set
4765 ;; `cfd-token-pos'. The loop below will later go back using
4766 ;; `cfd-continue-pos' to fix declarations inside the
4768 (when (and cfd-match-pos
(< cfd-match-pos syntactic-pos
))
4769 (goto-char syntactic-pos
)
4770 (c-forward-syntactic-ws)
4771 (and cfd-continue-pos
4772 (< cfd-continue-pos
(point))
4773 (setq cfd-token-pos
(point))))
4775 ;; Have one of the special cases when the region is completely
4776 ;; within a literal or macro. `cfd-continue-pos' is set to a
4777 ;; good start position for the search, so do it.
4778 (c-find-decl-prefix-search)))
4780 ;; Now loop. Round what? (ACM, 2006/7/5). We already got the first match.
4784 (< cfd-match-pos cfd-limit
)
4787 ;; Kludge to filter out matches on the "<" that
4788 ;; aren't open parens, for the sake of languages
4789 ;; that got `c-recognize-<>-arglists' set.
4790 (and (eq (char-before cfd-match-pos
) ?
<)
4791 (not (c-get-char-property (1- cfd-match-pos
)
4794 ;; If `cfd-continue-pos' is less or equal to
4795 ;; `cfd-token-pos', we've got a hit inside a macro
4796 ;; that's in the syntactic whitespace before the last
4797 ;; "real" declaration we've checked. If they're equal
4798 ;; we've arrived at the declaration a second time, so
4799 ;; there's nothing to do.
4800 (= cfd-continue-pos cfd-token-pos
)
4803 ;; If `cfd-continue-pos' is less than `cfd-token-pos'
4804 ;; we're still searching for declarations embedded in
4805 ;; the syntactic whitespace. In that case we need
4806 ;; only to skip comments and not macros, since they
4807 ;; can't be nested, and that's already been done in
4808 ;; `c-find-decl-prefix-search'.
4809 (when (> cfd-continue-pos cfd-token-pos
)
4810 (c-forward-syntactic-ws)
4811 (setq cfd-token-pos
(point)))
4813 ;; Continue if the following token fails the
4814 ;; CFD-DECL-RE and CFD-FACE-CHECKLIST checks.
4815 (when (or (>= (point) cfd-limit
)
4816 (not (looking-at cfd-decl-re
))
4817 (and cfd-face-checklist
4819 (point) cfd-face-checklist
))))
4820 (goto-char cfd-continue-pos
)
4823 (< (point) cfd-limit
))
4824 (c-find-decl-prefix-search))
4826 (< (point) cfd-limit
))
4829 (>= (point) cfd-start-pos
)
4832 ;; Narrow to the end of the macro if we got a hit inside
4833 ;; one, to avoid recognizing things that start inside the
4834 ;; macro and end outside it.
4835 (when (> cfd-match-pos cfd-macro-end
)
4836 ;; Not in the same macro as in the previous round.
4838 (goto-char cfd-match-pos
)
4840 (if (save-excursion (and (c-beginning-of-macro)
4841 (< (point) cfd-match-pos
)))
4842 (progn (c-end-of-macro)
4846 (if (zerop cfd-macro-end
)
4848 (if (> cfd-macro-end
(point))
4849 (progn (narrow-to-region (point-min) cfd-macro-end
)
4851 ;; The matched token was the last thing in the macro,
4852 ;; so the whole match is bogus.
4853 (setq cfd-macro-end
0)
4856 (c-debug-put-decl-spot-faces cfd-match-pos
(point))
4857 (if (funcall cfd-fun cfd-match-pos
(/= cfd-macro-end
0))
4858 (setq cfd-prop-match nil
))
4860 (when (/= cfd-macro-end
0)
4861 ;; Restore limits if we did macro narrowing above.
4862 (narrow-to-region (point-min) cfd-buffer-end
)))
4864 (goto-char cfd-continue-pos
)
4865 (if (= cfd-continue-pos cfd-limit
)
4866 (setq cfd-match-pos cfd-limit
)
4867 (c-find-decl-prefix-search)))))
4870 ;; A cache for found types.
4872 ;; Buffer local variable that contains an obarray with the types we've
4873 ;; found. If a declaration is recognized somewhere we record the
4874 ;; fully qualified identifier in it to recognize it as a type
4875 ;; elsewhere in the file too. This is not accurate since we do not
4876 ;; bother with the scoping rules of the languages, but in practice the
4877 ;; same name is seldom used as both a type and something else in a
4878 ;; file, and we only use this as a last resort in ambiguous cases (see
4879 ;; `c-forward-decl-or-cast-1').
4881 ;; Not every type need be in this cache. However, things which have
4882 ;; ceased to be types must be removed from it.
4884 ;; Template types in C++ are added here too but with the template
4885 ;; arglist replaced with "<>" in references or "<" for the one in the
4886 ;; primary type. E.g. the type "Foo<A,B>::Bar<C>" is stored as
4887 ;; "Foo<>::Bar<". This avoids storing very long strings (since C++
4888 ;; template specs can be fairly sized programs in themselves) and
4889 ;; improves the hit ratio (it's a type regardless of the template
4890 ;; args; it's just not the same type, but we're only interested in
4891 ;; recognizing types, not telling distinct types apart). Note that
4892 ;; template types in references are added here too; from the example
4893 ;; above there will also be an entry "Foo<".
4894 (defvar c-found-types nil
)
4895 (make-variable-buffer-local 'c-found-types
)
4897 (defsubst c-clear-found-types
()
4898 ;; Clears `c-found-types'.
4899 (setq c-found-types
(make-vector 53 0)))
4901 (defun c-add-type (from to
)
4902 ;; Add the given region as a type in `c-found-types'. If the region
4903 ;; doesn't match an existing type but there is a type which is equal
4904 ;; to the given one except that the last character is missing, then
4905 ;; the shorter type is removed. That's done to avoid adding all
4906 ;; prefixes of a type as it's being entered and font locked. This
4907 ;; doesn't cover cases like when characters are removed from a type
4908 ;; or added in the middle. We'd need the position of point when the
4909 ;; font locking is invoked to solve this well.
4911 ;; This function might do hidden buffer changes.
4912 (let ((type (c-syntactic-content from to c-recognize-
<>-arglists
)))
4913 (unless (intern-soft type c-found-types
)
4914 (unintern (substring type
0 -
1) c-found-types
)
4915 (intern type c-found-types
))))
4917 (defun c-unfind-type (name)
4918 ;; Remove the "NAME" from c-found-types, if present.
4919 (unintern name c-found-types
))
4921 (defsubst c-check-type
(from to
)
4922 ;; Return non-nil if the given region contains a type in
4925 ;; This function might do hidden buffer changes.
4926 (intern-soft (c-syntactic-content from to c-recognize-
<>-arglists
)
4929 (defun c-list-found-types ()
4930 ;; Return all the types in `c-found-types' as a sorted list of
4933 (mapatoms (lambda (type)
4934 (setq type-list
(cons (symbol-name type
)
4937 (sort type-list
'string-lessp
)))
4939 ;; Shut up the byte compiler.
4940 (defvar c-maybe-stale-found-type
)
4942 (defun c-trim-found-types (beg end old-len
)
4943 ;; An after change function which, in conjunction with the info in
4944 ;; c-maybe-stale-found-type (set in c-before-change), removes a type
4945 ;; from `c-found-types', should this type have become stale. For
4946 ;; example, this happens to "foo" when "foo \n bar();" becomes
4947 ;; "foo(); \n bar();". Such stale types, if not removed, foul up
4948 ;; the fontification.
4950 ;; Have we, perhaps, added non-ws characters to the front/back of a found
4954 (when (< end
(point-max))
4956 (if (and (c-beginning-of-current-token) ; only moves when we started in the middle
4957 (progn (goto-char end
)
4958 (c-end-of-current-token)))
4959 (c-unfind-type (buffer-substring-no-properties
4961 (when (> beg
(point-min))
4963 (if (and (c-end-of-current-token) ; only moves when we started in the middle
4964 (progn (goto-char beg
)
4965 (c-beginning-of-current-token)))
4966 (c-unfind-type (buffer-substring-no-properties
4969 (if c-maybe-stale-found-type
; e.g. (c-decl-id-start "foo" 97 107 " (* ooka) " "o")
4971 ;; Changing the amount of (already existing) whitespace - don't do anything.
4972 ((and (c-partial-ws-p beg end
)
4973 (or (= beg end
) ; removal of WS
4974 (string-match "^[ \t\n\r\f\v]*$" (nth 5 c-maybe-stale-found-type
)))))
4976 ;; The syntactic relationship which defined a "found type" has been
4978 ((eq (car c-maybe-stale-found-type
) 'c-decl-id-start
)
4979 (c-unfind-type (cadr c-maybe-stale-found-type
)))
4980 ;; ((eq (car c-maybe-stale-found-type) 'c-decl-type-start) FIXME!!!
4984 ;; Setting and removing syntax properties on < and > in languages (C++
4985 ;; and Java) where they can be template/generic delimiters as well as
4986 ;; their normal meaning of "less/greater than".
4988 ;; Normally, < and > have syntax 'punctuation'. When they are found to
4989 ;; be delimiters, they are marked as such with the category properties
4990 ;; c-<-as-paren-syntax, c->-as-paren-syntax respectively.
4994 ;; It is impossible to determine with certainty whether a <..> pair in
4995 ;; C++ is two comparison operators or is template delimiters, unless
4996 ;; one duplicates a lot of a C++ compiler. For example, the following
4999 ;; foo (a < b, c > d) ;
5001 ;; could be a function call with two integer parameters (each a
5002 ;; relational expression), or it could be a constructor for class foo
5003 ;; taking one parameter d of templated type "a < b, c >". They are
5004 ;; somewhat easier to distinguish in Java.
5006 ;; The strategy now (2010-01) adopted is to mark and unmark < and
5007 ;; > IN MATCHING PAIRS ONLY. [Previously, they were marked
5008 ;; individually when their context so indicated. This gave rise to
5009 ;; intractable problems when one of a matching pair was deleted, or
5010 ;; pulled into a literal.]
5012 ;; At each buffer change, the syntax-table properties are removed in a
5013 ;; before-change function and reapplied, when needed, in an
5014 ;; after-change function. It is far more important that the
5015 ;; properties get removed when they they are spurious than that they
5016 ;; be present when wanted.
5017 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
5018 (defun c-clear-<-pair-props
(&optional pos
)
5019 ;; POS (default point) is at a < character. If it is marked with
5020 ;; open paren syntax-table text property, remove the property,
5021 ;; together with the close paren property on the matching > (if
5027 (when (equal (c-get-char-property (point) 'syntax-table
)
5028 c-
<-as-paren-syntax
)
5029 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5030 (c-go-list-forward))
5031 (when (equal (c-get-char-property (1- (point)) 'syntax-table
)
5032 c-
>-as-paren-syntax
) ; should always be true.
5033 (c-clear-char-property (1- (point)) 'category
))
5034 (c-clear-char-property pos
'category
))))
5036 (defun c-clear->-pair-props
(&optional pos
)
5037 ;; POS (default point) is at a > character. If it is marked with
5038 ;; close paren syntax-table property, remove the property, together
5039 ;; with the open paren property on the matching < (if any).
5044 (when (equal (c-get-char-property (point) 'syntax-table
)
5045 c-
>-as-paren-syntax
)
5046 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5047 (c-go-up-list-backward))
5048 (when (equal (c-get-char-property (point) 'syntax-table
)
5049 c-
<-as-paren-syntax
) ; should always be true.
5050 (c-clear-char-property (point) 'category
))
5051 (c-clear-char-property pos
'category
))))
5053 (defun c-clear-<>-pair-props
(&optional pos
)
5054 ;; POS (default point) is at a < or > character. If it has an
5055 ;; open/close paren syntax-table property, remove this property both
5056 ;; from the current character and its partner (which will also be
5059 ((eq (char-after) ?\
<)
5060 (c-clear-<-pair-props pos
))
5061 ((eq (char-after) ?\
>)
5062 (c-clear->-pair-props pos
))
5064 "c-clear-<>-pair-props called from wrong position"))))
5066 (defun c-clear-<-pair-props-if-match-after
(lim &optional pos
)
5067 ;; POS (default point) is at a < character. If it is both marked
5068 ;; with open/close paren syntax-table property, and has a matching >
5069 ;; (also marked) which is after LIM, remove the property both from
5070 ;; the current > and its partner. Return t when this happens, nil
5076 (when (equal (c-get-char-property (point) 'syntax-table
)
5077 c-
<-as-paren-syntax
)
5078 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5079 (c-go-list-forward))
5080 (when (and (>= (point) lim
)
5081 (equal (c-get-char-property (1- (point)) 'syntax-table
)
5082 c-
>-as-paren-syntax
)) ; should always be true.
5083 (c-unmark-<-
>-as-paren
(1- (point)))
5084 (c-unmark-<-
>-as-paren pos
))
5087 (defun c-clear->-pair-props-if-match-before
(lim &optional pos
)
5088 ;; POS (default point) is at a > character. If it is both marked
5089 ;; with open/close paren syntax-table property, and has a matching <
5090 ;; (also marked) which is before LIM, remove the property both from
5091 ;; the current < and its partner. Return t when this happens, nil
5097 (when (equal (c-get-char-property (point) 'syntax-table
)
5098 c-
>-as-paren-syntax
)
5099 (with-syntax-table c-no-parens-syntax-table
; ignore unbalanced [,{,(,..
5100 (c-go-up-list-backward))
5101 (when (and (<= (point) lim
)
5102 (equal (c-get-char-property (point) 'syntax-table
)
5103 c-
<-as-paren-syntax
)) ; should always be true.
5104 (c-unmark-<-
>-as-paren
(point))
5105 (c-unmark-<-
>-as-paren pos
))
5108 ;; Set by c-common-init in cc-mode.el.
5112 (defun c-before-change-check-<>-operators
(beg end
)
5113 ;; Unmark certain pairs of "< .... >" which are currently marked as
5114 ;; template/generic delimiters. (This marking is via syntax-table
5115 ;; text properties).
5117 ;; These pairs are those which are in the current "statement" (i.e.,
5118 ;; the region between the {, }, or ; before BEG and the one after
5119 ;; END), and which enclose any part of the interval (BEG END).
5121 ;; Note that in C++ (?and Java), template/generic parens cannot
5122 ;; enclose a brace or semicolon, so we use these as bounds on the
5123 ;; region we must work on.
5125 ;; This function is called from before-change-functions (via
5126 ;; c-get-state-before-change-functions). Thus the buffer is widened,
5127 ;; and point is undefined, both at entry and exit.
5129 ;; FIXME!!! This routine ignores the possibility of macros entirely.
5132 (let ((beg-lit-limits (progn (goto-char beg
) (c-literal-limits)))
5133 (end-lit-limits (progn (goto-char end
) (c-literal-limits)))
5134 new-beg new-end need-new-beg need-new-end
)
5135 ;; Locate the barrier before the changed region
5136 (goto-char (if beg-lit-limits
(car beg-lit-limits
) beg
))
5137 (c-syntactic-skip-backward "^;{}" (max (- beg
2048) (point-min)))
5138 (setq new-beg
(point))
5140 ;; Remove the syntax-table properties from each pertinent <...> pair.
5141 ;; Firsly, the ones with the < before beg and > after beg.
5142 (while (c-search-forward-char-property 'category
'c-
<-as-paren-syntax beg
)
5143 (if (c-clear-<-pair-props-if-match-after beg
(1- (point)))
5144 (setq need-new-beg t
)))
5146 ;; Locate the barrier after END.
5147 (goto-char (if end-lit-limits
(cdr end-lit-limits
) end
))
5148 (c-syntactic-re-search-forward "[;{}]"
5149 (min (+ end
2048) (point-max)) 'end
)
5150 (setq new-end
(point))
5152 ;; Remove syntax-table properties from the remaining pertinent <...>
5153 ;; pairs, those with a > after end and < before end.
5154 (while (c-search-backward-char-property 'category
'c-
>-as-paren-syntax end
)
5155 (if (c-clear->-pair-props-if-match-before end
)
5156 (setq need-new-end t
)))
5158 ;; Extend the fontification region, if needed.
5161 (c-forward-syntactic-ws)
5162 (and (< (point) c-new-BEG
) (setq c-new-BEG
(point))))
5165 (and (> new-end c-new-END
) (setq c-new-END new-end
))))))
5169 (defun c-after-change-check-<>-operators
(beg end
)
5170 ;; This is called from `after-change-functions' when
5171 ;; c-recognize-<>-arglists' is set. It ensures that no "<" or ">"
5172 ;; chars with paren syntax become part of another operator like "<<"
5175 ;; This function might do hidden buffer changes.
5179 (when (or (looking-at "[<>]")
5180 (< (skip-chars-backward "<>") 0))
5183 (c-beginning-of-current-token)
5184 (when (and (< (point) beg
)
5185 (looking-at c-
<>-multichar-token-regexp
)
5186 (< beg
(setq beg
(match-end 0))))
5187 (while (progn (skip-chars-forward "^<>" beg
)
5189 (c-clear-<>-pair-props
)
5194 (when (or (looking-at "[<>]")
5195 (< (skip-chars-backward "<>") 0))
5198 (c-beginning-of-current-token)
5199 (when (and (< (point) end
)
5200 (looking-at c-
<>-multichar-token-regexp
)
5201 (< end
(setq end
(match-end 0))))
5202 (while (progn (skip-chars-forward "^<>" end
)
5204 (c-clear-<>-pair-props
)
5205 (forward-char)))))))
5209 ;; Handling of small scale constructs like types and names.
5211 ;; Dynamically bound variable that instructs `c-forward-type' to also
5212 ;; treat possible types (i.e. those that it normally returns 'maybe or
5213 ;; 'found for) as actual types (and always return 'found for them).
5214 ;; This means that it records them in `c-record-type-identifiers' if
5215 ;; that is set, and that it adds them to `c-found-types'.
5216 (defvar c-promote-possible-types nil
)
5218 ;; Dynamically bound variable that instructs `c-forward-<>-arglist' to
5219 ;; mark up successfully parsed arglists with paren syntax properties on
5220 ;; the surrounding angle brackets and with `c-<>-arg-sep' in the
5221 ;; `c-type' property of each argument separating comma.
5223 ;; Setting this variable also makes `c-forward-<>-arglist' recurse into
5224 ;; all arglists for side effects (i.e. recording types), otherwise it
5225 ;; exploits any existing paren syntax properties to quickly jump to the
5226 ;; end of already parsed arglists.
5228 ;; Marking up the arglists is not the default since doing that correctly
5229 ;; depends on a proper value for `c-restricted-<>-arglists'.
5230 (defvar c-parse-and-markup-
<>-arglists nil
)
5232 ;; Dynamically bound variable that instructs `c-forward-<>-arglist' to
5233 ;; not accept arglists that contain binary operators.
5235 ;; This is primarily used to handle C++ template arglists. C++
5236 ;; disambiguates them by checking whether the preceding name is a
5237 ;; template or not. We can't do that, so we assume it is a template
5238 ;; if it can be parsed as one. That usually works well since
5239 ;; comparison expressions on the forms "a < b > c" or "a < b, c > d"
5240 ;; in almost all cases would be pointless.
5242 ;; However, in function arglists, e.g. in "foo (a < b, c > d)", we
5243 ;; should let the comma separate the function arguments instead. And
5244 ;; in a context where the value of the expression is taken, e.g. in
5245 ;; "if (a < b || c > d)", it's probably not a template.
5246 (defvar c-restricted-
<>-arglists nil
)
5248 ;; Dynamically bound variables that instructs
5249 ;; `c-forward-keyword-clause', `c-forward-<>-arglist',
5250 ;; `c-forward-name', `c-forward-type', `c-forward-decl-or-cast-1', and
5251 ;; `c-forward-label' to record the ranges of all the type and
5252 ;; reference identifiers they encounter. They will build lists on
5253 ;; these variables where each element is a cons of the buffer
5254 ;; positions surrounding each identifier. This recording is only
5255 ;; activated when `c-record-type-identifiers' is non-nil.
5257 ;; All known types that can't be identifiers are recorded, and also
5258 ;; other possible types if `c-promote-possible-types' is set.
5259 ;; Recording is however disabled inside angle bracket arglists that
5260 ;; are encountered inside names and other angle bracket arglists.
5261 ;; Such occurrences are taken care of by `c-font-lock-<>-arglists'
5264 ;; Only the names in C++ template style references (e.g. "tmpl" in
5265 ;; "tmpl<a,b>::foo") are recorded as references, other references
5266 ;; aren't handled here.
5268 ;; `c-forward-label' records the label identifier(s) on
5269 ;; `c-record-ref-identifiers'.
5270 (defvar c-record-type-identifiers nil
)
5271 (defvar c-record-ref-identifiers nil
)
5273 ;; This variable will receive a cons cell of the range of the last
5274 ;; single identifier symbol stepped over by `c-forward-name' if it's
5275 ;; successful. This is the range that should be put on one of the
5276 ;; record lists above by the caller. It's assigned nil if there's no
5277 ;; such symbol in the name.
5278 (defvar c-last-identifier-range nil
)
5280 (defmacro c-record-type-id
(range)
5281 (if (eq (car-safe range
) 'cons
)
5283 `(setq c-record-type-identifiers
5284 (cons ,range c-record-type-identifiers
))
5285 `(let ((range ,range
))
5287 (setq c-record-type-identifiers
5288 (cons range c-record-type-identifiers
))))))
5290 (defmacro c-record-ref-id
(range)
5291 (if (eq (car-safe range
) 'cons
)
5293 `(setq c-record-ref-identifiers
5294 (cons ,range c-record-ref-identifiers
))
5295 `(let ((range ,range
))
5297 (setq c-record-ref-identifiers
5298 (cons range c-record-ref-identifiers
))))))
5300 ;; Dynamically bound variable that instructs `c-forward-type' to
5301 ;; record the ranges of types that only are found. Behaves otherwise
5302 ;; like `c-record-type-identifiers'.
5303 (defvar c-record-found-types nil
)
5305 (defmacro c-forward-keyword-prefixed-id
(type)
5306 ;; Used internally in `c-forward-keyword-clause' to move forward
5307 ;; over a type (if TYPE is 'type) or a name (otherwise) which
5308 ;; possibly is prefixed by keywords and their associated clauses.
5309 ;; Try with a type/name first to not trip up on those that begin
5310 ;; with a keyword. Return t if a known or found type is moved
5311 ;; over. The point is clobbered if nil is returned. If range
5312 ;; recording is enabled, the identifier is recorded on as a type
5313 ;; if TYPE is 'type or as a reference if TYPE is 'ref.
5315 ;; This macro might do hidden buffer changes.
5317 (while (if (setq res
,(if (eq type
'type
)
5321 (and (looking-at c-keywords-regexp
)
5322 (c-forward-keyword-clause 1))))
5323 (when (memq res
'(t known found prefix
))
5324 ,(when (eq type
'ref
)
5325 `(when c-record-type-identifiers
5326 (c-record-ref-id c-last-identifier-range
)))
5329 (defmacro c-forward-id-comma-list
(type update-safe-pos
)
5330 ;; Used internally in `c-forward-keyword-clause' to move forward
5331 ;; over a comma separated list of types or names using
5332 ;; `c-forward-keyword-prefixed-id'.
5334 ;; This macro might do hidden buffer changes.
5336 ,(when update-safe-pos
5337 `(setq safe-pos
(point)))
5338 (eq (char-after) ?
,))
5341 (c-forward-syntactic-ws)
5342 (c-forward-keyword-prefixed-id ,type
)))))
5344 (defun c-forward-keyword-clause (match)
5345 ;; Submatch MATCH in the current match data is assumed to surround a
5346 ;; token. If it's a keyword, move over it and any immediately
5347 ;; following clauses associated with it, stopping at the start of
5348 ;; the next token. t is returned in that case, otherwise the point
5349 ;; stays and nil is returned. The kind of clauses that are
5350 ;; recognized are those specified by `c-type-list-kwds',
5351 ;; `c-ref-list-kwds', `c-colon-type-list-kwds',
5352 ;; `c-paren-nontype-kwds', `c-paren-type-kwds', `c-<>-type-kwds',
5353 ;; and `c-<>-arglist-kwds'.
5355 ;; This function records identifier ranges on
5356 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5357 ;; `c-record-type-identifiers' is non-nil.
5359 ;; Note that for `c-colon-type-list-kwds', which doesn't necessary
5360 ;; apply directly after the keyword, the type list is moved over
5361 ;; only when there is no unaccounted token before it (i.e. a token
5362 ;; that isn't moved over due to some other keyword list). The
5363 ;; identifier ranges in the list are still recorded if that should
5366 ;; This function might do hidden buffer changes.
5368 (let ((kwd-sym (c-keyword-sym (match-string match
))) safe-pos pos
5369 ;; The call to `c-forward-<>-arglist' below is made after
5370 ;; `c-<>-sexp-kwds' keywords, so we're certain they actually
5371 ;; are angle bracket arglists and `c-restricted-<>-arglists'
5372 ;; should therefore be nil.
5373 (c-parse-and-markup-<>-arglists t
)
5374 c-restricted-
<>-arglists
)
5377 (goto-char (match-end match
))
5378 (c-forward-syntactic-ws)
5379 (setq safe-pos
(point))
5382 ((and (c-keyword-member kwd-sym
'c-type-list-kwds
)
5383 (c-forward-keyword-prefixed-id type
))
5384 ;; There's a type directly after a keyword in `c-type-list-kwds'.
5385 (c-forward-id-comma-list type t
))
5387 ((and (c-keyword-member kwd-sym
'c-ref-list-kwds
)
5388 (c-forward-keyword-prefixed-id ref
))
5389 ;; There's a name directly after a keyword in `c-ref-list-kwds'.
5390 (c-forward-id-comma-list ref t
))
5392 ((and (c-keyword-member kwd-sym
'c-paren-any-kwds
)
5393 (eq (char-after) ?\
())
5394 ;; There's an open paren after a keyword in `c-paren-any-kwds'.
5397 (when (and (setq pos
(c-up-list-forward))
5398 (eq (char-before pos
) ?\
)))
5399 (when (and c-record-type-identifiers
5400 (c-keyword-member kwd-sym
'c-paren-type-kwds
))
5401 ;; Use `c-forward-type' on every identifier we can find
5402 ;; inside the paren, to record the types.
5403 (while (c-syntactic-re-search-forward c-symbol-start pos t
)
5404 (goto-char (match-beginning 0))
5405 (unless (c-forward-type)
5406 (looking-at c-symbol-key
) ; Always matches.
5407 (goto-char (match-end 0)))))
5410 (c-forward-syntactic-ws)
5411 (setq safe-pos
(point))))
5413 ((and (c-keyword-member kwd-sym
'c-
<>-sexp-kwds
)
5414 (eq (char-after) ?
<)
5415 (c-forward-<>-arglist
(c-keyword-member kwd-sym
'c-
<>-type-kwds
)))
5416 (c-forward-syntactic-ws)
5417 (setq safe-pos
(point)))
5419 ((and (c-keyword-member kwd-sym
'c-nonsymbol-sexp-kwds
)
5420 (not (looking-at c-symbol-start
))
5421 (c-safe (c-forward-sexp) t
))
5422 (c-forward-syntactic-ws)
5423 (setq safe-pos
(point))))
5425 (when (c-keyword-member kwd-sym
'c-colon-type-list-kwds
)
5426 (if (eq (char-after) ?
:)
5427 ;; If we are at the colon already, we move over the type
5431 (c-forward-syntactic-ws)
5432 (when (c-forward-keyword-prefixed-id type
)
5433 (c-forward-id-comma-list type t
)))
5434 ;; Not at the colon, so stop here. But the identifier
5435 ;; ranges in the type list later on should still be
5437 (and c-record-type-identifiers
5439 ;; If a keyword matched both one of the types above and
5440 ;; this one, we match `c-colon-type-list-re' after the
5441 ;; clause matched above.
5442 (goto-char safe-pos
)
5443 (looking-at c-colon-type-list-re
))
5445 (goto-char (match-end 0))
5446 (c-forward-syntactic-ws)
5447 (c-forward-keyword-prefixed-id type
))
5448 ;; There's a type after the `c-colon-type-list-re' match
5449 ;; after a keyword in `c-colon-type-list-kwds'.
5450 (c-forward-id-comma-list type nil
))))
5452 (goto-char safe-pos
)
5455 ;; cc-mode requires cc-fonts.
5456 (declare-function c-fontify-recorded-types-and-refs
"cc-fonts" ())
5458 (defun c-forward-<>-arglist
(all-types)
5459 ;; The point is assumed to be at a "<". Try to treat it as the open
5460 ;; paren of an angle bracket arglist and move forward to the
5461 ;; corresponding ">". If successful, the point is left after the
5462 ;; ">" and t is returned, otherwise the point isn't moved and nil is
5463 ;; returned. If ALL-TYPES is t then all encountered arguments in
5464 ;; the arglist that might be types are treated as found types.
5466 ;; The variable `c-parse-and-markup-<>-arglists' controls how this
5467 ;; function handles text properties on the angle brackets and argument
5468 ;; separating commas.
5470 ;; `c-restricted-<>-arglists' controls how lenient the template
5471 ;; arglist recognition should be.
5473 ;; This function records identifier ranges on
5474 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5475 ;; `c-record-type-identifiers' is non-nil.
5477 ;; This function might do hidden buffer changes.
5479 (let ((start (point))
5480 ;; If `c-record-type-identifiers' is set then activate
5481 ;; recording of any found types that constitute an argument in
5483 (c-record-found-types (if c-record-type-identifiers t
)))
5484 (if (catch 'angle-bracket-arglist-escape
5485 (setq c-record-found-types
5486 (c-forward-<>-arglist-recur all-types
)))
5488 (when (consp c-record-found-types
)
5489 (setq c-record-type-identifiers
5490 ;; `nconc' doesn't mind that the tail of
5491 ;; `c-record-found-types' is t.
5492 (nconc c-record-found-types c-record-type-identifiers
)))
5493 (if (c-major-mode-is 'java-mode
) (c-fontify-recorded-types-and-refs))
5499 (defun c-forward-<>-arglist-recur
(all-types)
5500 ;; Recursive part of `c-forward-<>-arglist'.
5502 ;; This function might do hidden buffer changes.
5504 (let ((start (point)) res pos tmp
5505 ;; Cover this so that any recorded found type ranges are
5506 ;; automatically lost if it turns out to not be an angle
5507 ;; bracket arglist. It's propagated through the return value
5508 ;; on successful completion.
5509 (c-record-found-types c-record-found-types
)
5510 ;; List that collects the positions after the argument
5511 ;; separating ',' in the arglist.
5513 ;; If the '<' has paren open syntax then we've marked it as an angle
5514 ;; bracket arglist before, so skip to the end.
5515 (if (and (not c-parse-and-markup-
<>-arglists
)
5516 (c-get-char-property (point) 'syntax-table
))
5520 (if (and (c-go-up-list-forward)
5521 (eq (char-before) ?
>))
5523 ;; Got unmatched paren angle brackets. We don't clear the paren
5524 ;; syntax properties and retry, on the basis that it's very
5525 ;; unlikely that paren angle brackets become operators by code
5526 ;; manipulation. It's far more likely that it doesn't match due
5527 ;; to narrowing or some temporary change.
5531 (forward-char) ; Forward over the opening '<'.
5533 (unless (looking-at c-
<-op-cont-regexp
)
5534 ;; go forward one non-alphanumeric character (group) per iteration of
5538 (c-forward-syntactic-ws)
5539 (let ((orig-record-found-types c-record-found-types
))
5540 (when (or (and c-record-type-identifiers all-types
)
5541 (c-major-mode-is 'java-mode
))
5542 ;; All encountered identifiers are types, so set the
5543 ;; promote flag and parse the type.
5545 (c-forward-syntactic-ws)
5546 (if (looking-at "\\?")
5548 (when (looking-at c-identifier-start
)
5549 (let ((c-promote-possible-types t
)
5550 (c-record-found-types t
))
5553 (c-forward-syntactic-ws)
5555 (when (or (looking-at "extends")
5556 (looking-at "super"))
5558 (c-forward-syntactic-ws)
5559 (let ((c-promote-possible-types t
)
5560 (c-record-found-types t
))
5562 (c-forward-syntactic-ws))))))
5564 (setq pos
(point)) ; e.g. first token inside the '<'
5566 ;; Note: These regexps exploit the match order in \| so
5567 ;; that "<>" is matched by "<" rather than "[^>:-]>".
5568 (c-syntactic-re-search-forward
5569 ;; Stop on ',', '|', '&', '+' and '-' to catch
5570 ;; common binary operators that could be between
5571 ;; two comparison expressions "a<b" and "c>d".
5572 "[<;{},|+&-]\\|[>)]"
5576 ((eq (char-before) ?
>)
5577 ;; Either an operator starting with '>' or the end of
5578 ;; the angle bracket arglist.
5580 (if (looking-at c-
>-op-cont-regexp
)
5582 (goto-char (match-end 0))
5583 t
) ; Continue the loop.
5585 ;; The angle bracket arglist is finished.
5586 (when c-parse-and-markup-
<>-arglists
5587 (while arg-start-pos
5588 (c-put-c-type-property (1- (car arg-start-pos
))
5590 (setq arg-start-pos
(cdr arg-start-pos
)))
5591 (c-mark-<-as-paren start
)
5592 (c-mark->-as-paren
(1- (point))))
5594 nil
)) ; Exit the loop.
5596 ((eq (char-before) ?
<)
5597 ;; Either an operator starting with '<' or a nested arglist.
5599 (let (id-start id-end subres keyword-match
)
5601 ;; The '<' begins a multi-char operator.
5602 ((looking-at c-
<-op-cont-regexp
)
5603 (setq tmp
(match-end 0))
5604 (goto-char (match-end 0)))
5605 ;; We're at a nested <.....>
5608 (backward-char) ; to the '<'
5611 ;; There's always an identifier before an angle
5612 ;; bracket arglist, or a keyword in `c-<>-type-kwds'
5613 ;; or `c-<>-arglist-kwds'.
5614 (c-backward-syntactic-ws)
5615 (setq id-end
(point))
5616 (c-simple-skip-symbol-backward)
5617 (when (or (setq keyword-match
5618 (looking-at c-opt-
<>-sexp-key
))
5619 (not (looking-at c-keywords-regexp
)))
5620 (setq id-start
(point))))
5622 (let ((c-promote-possible-types t
)
5623 (c-record-found-types t
))
5624 (c-forward-<>-arglist-recur
5627 (c-keyword-sym (match-string 1))
5628 'c-
<>-type-kwds
)))))))
5630 ;; It was an angle bracket arglist.
5631 (setq c-record-found-types subres
)
5633 ;; Record the identifier before the template as a type
5634 ;; or reference depending on whether the arglist is last
5635 ;; in a qualified identifier.
5636 (when (and c-record-type-identifiers
5637 (not keyword-match
))
5638 (if (and c-opt-identifier-concat-key
5640 (c-forward-syntactic-ws)
5641 (looking-at c-opt-identifier-concat-key
)))
5642 (c-record-ref-id (cons id-start id-end
))
5643 (c-record-type-id (cons id-start id-end
)))))
5645 ;; At a "less than" operator.
5649 t
) ; carry on looping.
5651 ((and (not c-restricted-
<>-arglists
)
5652 (or (and (eq (char-before) ?
&)
5653 (not (eq (char-after) ?
&)))
5654 (eq (char-before) ?
,)))
5655 ;; Just another argument. Record the position. The
5656 ;; type check stuff that made us stop at it is at
5657 ;; the top of the loop.
5658 (setq arg-start-pos
(cons (point) arg-start-pos
)))
5661 ;; Got a character that can't be in an angle bracket
5662 ;; arglist argument. Abort using `throw', since
5663 ;; it's useless to try to find a surrounding arglist
5665 (throw 'angle-bracket-arglist-escape nil
))))))
5667 (or c-record-found-types t
)))))
5669 (defun c-backward-<>-arglist
(all-types &optional limit
)
5670 ;; The point is assumed to be directly after a ">". Try to treat it
5671 ;; as the close paren of an angle bracket arglist and move back to
5672 ;; the corresponding "<". If successful, the point is left at
5673 ;; the "<" and t is returned, otherwise the point isn't moved and
5674 ;; nil is returned. ALL-TYPES is passed on to
5675 ;; `c-forward-<>-arglist'.
5677 ;; If the optional LIMIT is given, it bounds the backward search.
5678 ;; It's then assumed to be at a syntactically relevant position.
5680 ;; This is a wrapper around `c-forward-<>-arglist'. See that
5681 ;; function for more details.
5683 (let ((start (point)))
5685 (if (and (not c-parse-and-markup-
<>-arglists
)
5686 (c-get-char-property (point) 'syntax-table
))
5688 (if (and (c-go-up-list-backward)
5689 (eq (char-after) ?
<))
5691 ;; See corresponding note in `c-forward-<>-arglist'.
5696 (c-syntactic-skip-backward "^<;{}" limit t
)
5699 (if (eq (char-before) ?
<)
5701 ;; Stopped at bob or a char that isn't allowed in an
5702 ;; arglist, so we've failed.
5707 (progn (c-beginning-of-current-token)
5709 ;; If we moved then the "<" was part of some
5710 ;; multicharacter token.
5714 (let ((beg-pos (point)))
5715 (if (c-forward-<>-arglist all-types
)
5716 (cond ((= (point) start
)
5717 ;; Matched the arglist. Break the while.
5721 ;; We started from a non-paren ">" inside an
5726 ;; Matched a shorter arglist. Can be a nested
5727 ;; one so continue looking.
5732 (/= (point) start
))))
5734 (defun c-forward-name ()
5735 ;; Move forward over a complete name if at the beginning of one,
5736 ;; stopping at the next following token. A keyword, as such,
5737 ;; doesn't count as a name. If the point is not at something that
5738 ;; is recognized as a name then it stays put.
5740 ;; A name could be something as simple as "foo" in C or something as
5741 ;; complex as "X<Y<class A<int>::B, BIT_MAX >> b>, ::operator<> ::
5742 ;; Z<(a>b)> :: operator const X<&foo>::T Q::G<unsigned short
5743 ;; int>::*volatile const" in C++ (this function is actually little
5744 ;; more than a `looking-at' call in all modes except those that,
5745 ;; like C++, have `c-recognize-<>-arglists' set).
5748 ;; o - nil if no name is found;
5749 ;; o - 'template if it's an identifier ending with an angle bracket
5751 ;; o - 'operator of it's an operator identifier;
5752 ;; o - t if it's some other kind of name.
5754 ;; This function records identifier ranges on
5755 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5756 ;; `c-record-type-identifiers' is non-nil.
5758 ;; This function might do hidden buffer changes.
5760 (let ((pos (point)) (start (point)) res id-start id-end
5761 ;; Turn off `c-promote-possible-types' here since we might
5762 ;; call `c-forward-<>-arglist' and we don't want it to promote
5763 ;; every suspect thing in the arglist to a type. We're
5764 ;; typically called from `c-forward-type' in this case, and
5765 ;; the caller only wants the top level type that it finds to
5767 c-promote-possible-types
)
5770 (looking-at c-identifier-key
)
5773 ;; Check for keyword. We go to the last symbol in
5774 ;; `c-identifier-key' first.
5775 (goto-char (setq id-end
(match-end 0)))
5776 (c-simple-skip-symbol-backward)
5777 (setq id-start
(point))
5779 (if (looking-at c-keywords-regexp
)
5780 (when (and (c-major-mode-is 'c
++-mode
)
5782 (cc-eval-when-compile
5783 (concat "\\(operator\\|\\(template\\)\\)"
5784 "\\(" (c-lang-const c-nonsymbol-key c
++)
5786 (if (match-beginning 2)
5787 ;; "template" is only valid inside an
5788 ;; identifier if preceded by "::".
5790 (c-backward-syntactic-ws)
5791 (and (c-safe (backward-char 2) t
)
5795 ;; Handle a C++ operator or template identifier.
5797 (c-forward-syntactic-ws)
5798 (cond ((eq (char-before id-end
) ?e
)
5799 ;; Got "... ::template".
5800 (let ((subres (c-forward-name)))
5805 ((looking-at c-identifier-start
)
5806 ;; Got a cast operator.
5807 (when (c-forward-type)
5810 ;; Now we should match a sequence of either
5811 ;; '*', '&' or a name followed by ":: *",
5812 ;; where each can be followed by a sequence
5813 ;; of `c-opt-type-modifier-key'.
5814 (while (cond ((looking-at "[*&]")
5815 (goto-char (match-end 0))
5817 ((looking-at c-identifier-start
)
5818 (and (c-forward-name)
5821 (goto-char (match-end 0))
5822 (c-forward-syntactic-ws)
5823 (eq (char-after) ?
*))
5828 (c-forward-syntactic-ws)
5830 (looking-at c-opt-type-modifier-key
))
5831 (goto-char (match-end 1))))))
5833 ((looking-at c-overloadable-operators-regexp
)
5834 ;; Got some other operator.
5835 (setq c-last-identifier-range
5836 (cons (point) (match-end 0)))
5837 (goto-char (match-end 0))
5838 (c-forward-syntactic-ws)
5844 ;; `id-start' is equal to `id-end' if we've jumped over
5845 ;; an identifier that doesn't end with a symbol token.
5846 ;; That can occur e.g. for Java import directives on the
5847 ;; form "foo.bar.*".
5848 (when (and id-start
(/= id-start id-end
))
5849 (setq c-last-identifier-range
5850 (cons id-start id-end
)))
5852 (c-forward-syntactic-ws)
5858 (when (or c-opt-identifier-concat-key
5859 c-recognize-
<>-arglists
)
5862 ((and c-opt-identifier-concat-key
5863 (looking-at c-opt-identifier-concat-key
))
5864 ;; Got a concatenated identifier. This handles the
5865 ;; cases with tricky syntactic whitespace that aren't
5866 ;; covered in `c-identifier-key'.
5867 (goto-char (match-end 0))
5868 (c-forward-syntactic-ws)
5871 ((and c-recognize-
<>-arglists
5872 (eq (char-after) ?
<))
5873 ;; Maybe an angle bracket arglist.
5874 (when (let ((c-record-type-identifiers t
)
5875 (c-record-found-types t
))
5876 (c-forward-<>-arglist nil
))
5878 (c-add-type start
(1+ pos
))
5879 (c-forward-syntactic-ws)
5881 c-last-identifier-range nil
)
5883 (if (and c-opt-identifier-concat-key
5884 (looking-at c-opt-identifier-concat-key
))
5886 ;; Continue if there's an identifier concatenation
5887 ;; operator after the template argument.
5889 (when (and c-record-type-identifiers id-start
)
5890 (c-record-ref-id (cons id-start id-end
)))
5892 (c-forward-syntactic-ws)
5895 (when (and c-record-type-identifiers id-start
)
5896 (c-record-type-id (cons id-start id-end
)))
5897 (setq res
'template
)
5904 (defun c-forward-type (&optional brace-block-too
)
5905 ;; Move forward over a type spec if at the beginning of one,
5906 ;; stopping at the next following token. The keyword "typedef"
5907 ;; isn't part of a type spec here.
5909 ;; BRACE-BLOCK-TOO, when non-nil, means move over the brace block in
5910 ;; constructs like "struct foo {...} bar ;" or "struct {...} bar;".
5911 ;; The current (2009-03-10) intention is to convert all uses of
5912 ;; `c-forward-type' to call with this parameter set, then to
5916 ;; o - t if it's a known type that can't be a name or other
5918 ;; o - 'known if it's an otherwise known type (according to
5919 ;; `*-font-lock-extra-types');
5920 ;; o - 'prefix if it's a known prefix of a type;
5921 ;; o - 'found if it's a type that matches one in `c-found-types';
5922 ;; o - 'maybe if it's an identifier that might be a type; or
5923 ;; o - nil if it can't be a type (the point isn't moved then).
5925 ;; The point is assumed to be at the beginning of a token.
5927 ;; Note that this function doesn't skip past the brace definition
5928 ;; that might be considered part of the type, e.g.
5929 ;; "enum {a, b, c} foo".
5931 ;; This function records identifier ranges on
5932 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
5933 ;; `c-record-type-identifiers' is non-nil.
5935 ;; This function might do hidden buffer changes.
5936 (when (and c-recognize-
<>-arglists
5938 (c-forward-<>-arglist t
)
5939 (c-forward-syntactic-ws))
5941 (let ((start (point)) pos res name-res id-start id-end id-range
)
5943 ;; Skip leading type modifiers. If any are found we know it's a
5944 ;; prefix of a type.
5945 (when c-opt-type-modifier-key
; e.g. "const" "volatile", but NOT "typedef"
5946 (while (looking-at c-opt-type-modifier-key
)
5947 (goto-char (match-end 1))
5948 (c-forward-syntactic-ws)
5949 (setq res
'prefix
)))
5952 ((looking-at c-type-prefix-key
) ; e.g. "struct", "class", but NOT
5954 (goto-char (match-end 1))
5955 (c-forward-syntactic-ws)
5958 (setq name-res
(c-forward-name))
5959 (setq res
(not (null name-res
)))
5960 (when (eq name-res t
)
5961 ;; In many languages the name can be used without the
5962 ;; prefix, so we add it to `c-found-types'.
5963 (c-add-type pos
(point))
5964 (when (and c-record-type-identifiers
5965 c-last-identifier-range
)
5966 (c-record-type-id c-last-identifier-range
)))
5967 (when (and brace-block-too
5969 (eq (char-after) ?\
{)
5972 (progn (c-forward-sexp)
5973 (c-forward-syntactic-ws)
5974 (setq pos
(point))))))
5977 (unless res
(goto-char start
))) ; invalid syntax
5981 (if (looking-at c-identifier-start
)
5983 (setq id-start
(point)
5984 name-res
(c-forward-name))
5986 (setq id-end
(point)
5987 id-range c-last-identifier-range
))))
5988 (and (cond ((looking-at c-primitive-type-key
)
5990 ((c-with-syntax-table c-identifier-syntax-table
5991 (looking-at c-known-type-key
))
5996 (goto-char (match-end 1))
5997 (c-forward-syntactic-ws)
5998 (setq pos
(point))))
6001 ;; Looking at a primitive or known type identifier. We've
6002 ;; checked for a name first so that we don't go here if the
6003 ;; known type match only is a prefix of another name.
6005 (setq id-end
(match-end 1))
6007 (when (and c-record-type-identifiers
6008 (or c-promote-possible-types
(eq res t
)))
6009 (c-record-type-id (cons (match-beginning 1) (match-end 1))))
6011 (if (and c-opt-type-component-key
6013 (looking-at c-opt-type-component-key
)))
6014 ;; There might be more keywords for the type.
6016 (c-forward-keyword-clause 1)
6018 (setq safe-pos
(point))
6019 (looking-at c-opt-type-component-key
))
6020 (when (and c-record-type-identifiers
6021 (looking-at c-primitive-type-key
))
6022 (c-record-type-id (cons (match-beginning 1)
6024 (c-forward-keyword-clause 1))
6025 (if (looking-at c-primitive-type-key
)
6027 (when c-record-type-identifiers
6028 (c-record-type-id (cons (match-beginning 1)
6030 (c-forward-keyword-clause 1)
6032 (goto-char safe-pos
)
6033 (setq res
'prefix
)))
6034 (unless (save-match-data (c-forward-keyword-clause 1))
6037 (goto-char (match-end 1))
6038 (c-forward-syntactic-ws)))))
6041 (cond ((eq name-res t
)
6042 ;; A normal identifier.
6044 (if (or res c-promote-possible-types
)
6046 (c-add-type id-start id-end
)
6047 (when (and c-record-type-identifiers id-range
)
6048 (c-record-type-id id-range
))
6051 (setq res
(if (c-check-type id-start id-end
)
6052 ;; It's an identifier that has been used as
6053 ;; a type somewhere else.
6055 ;; It's an identifier that might be a type.
6057 ((eq name-res
'template
)
6058 ;; A template is a type.
6062 ;; Otherwise it's an operator identifier, which is not a type.
6067 ;; Skip trailing type modifiers. If any are found we know it's
6069 (when c-opt-type-modifier-key
6070 (while (looking-at c-opt-type-modifier-key
) ; e.g. "const", "volatile"
6071 (goto-char (match-end 1))
6072 (c-forward-syntactic-ws)
6074 ;; Step over any type suffix operator. Do not let the existence
6075 ;; of these alter the classification of the found type, since
6076 ;; these operators typically are allowed in normal expressions
6078 (when c-opt-type-suffix-key
6079 (while (looking-at c-opt-type-suffix-key
)
6080 (goto-char (match-end 1))
6081 (c-forward-syntactic-ws)))
6083 (when c-opt-type-concat-key
; Only/mainly for pike.
6084 ;; Look for a trailing operator that concatenates the type
6085 ;; with a following one, and if so step past that one through
6086 ;; a recursive call. Note that we don't record concatenated
6087 ;; types in `c-found-types' - it's the component types that
6088 ;; are recorded when appropriate.
6090 (let* ((c-promote-possible-types (or (memq res
'(t known
))
6091 c-promote-possible-types
))
6092 ;; If we can't promote then set `c-record-found-types' so that
6093 ;; we can merge in the types from the second part afterwards if
6094 ;; it turns out to be a known type there.
6095 (c-record-found-types (and c-record-type-identifiers
6096 (not c-promote-possible-types
)))
6098 (if (and (looking-at c-opt-type-concat-key
)
6101 (goto-char (match-end 1))
6102 (c-forward-syntactic-ws)
6103 (setq subres
(c-forward-type))))
6106 ;; If either operand certainly is a type then both are, but we
6107 ;; don't let the existence of the operator itself promote two
6108 ;; uncertain types to a certain one.
6111 (unless (eq name-res
'template
)
6112 (c-add-type id-start id-end
))
6113 (when (and c-record-type-identifiers id-range
)
6114 (c-record-type-id id-range
))
6125 (when (and (eq res t
)
6126 (consp c-record-found-types
))
6127 ;; Merge in the ranges of any types found by the second
6128 ;; `c-forward-type'.
6129 (setq c-record-type-identifiers
6130 ;; `nconc' doesn't mind that the tail of
6131 ;; `c-record-found-types' is t.
6132 (nconc c-record-found-types
6133 c-record-type-identifiers
))))
6137 (when (and c-record-found-types
(memq res
'(known found
)) id-range
)
6138 (setq c-record-found-types
6139 (cons id-range c-record-found-types
))))
6141 ;;(message "c-forward-type %s -> %s: %s" start (point) res)
6145 (defun c-forward-annotation ()
6146 ;; Used for Java code only at the moment. Assumes point is on the
6147 ;; @, moves forward an annotation. returns nil if there is no
6148 ;; annotation at point.
6149 (and (looking-at "@")
6150 (progn (forward-char) t
)
6152 (progn (c-forward-syntactic-ws) t
)
6153 (if (looking-at "(")
6158 ;; Handling of large scale constructs like statements and declarations.
6160 ;; Macro used inside `c-forward-decl-or-cast-1'. It ought to be a
6161 ;; defsubst or perhaps even a defun, but it contains lots of free
6162 ;; variables that refer to things inside `c-forward-decl-or-cast-1'.
6163 (defmacro c-fdoc-shift-type-backward
(&optional short
)
6164 ;; `c-forward-decl-or-cast-1' can consume an arbitrary length list
6165 ;; of types when parsing a declaration, which means that it
6166 ;; sometimes consumes the identifier in the declaration as a type.
6167 ;; This is used to "backtrack" and make the last type be treated as
6168 ;; an identifier instead.
6171 ;; These identifiers are bound only in the inner let.
6172 '(setq identifier-type at-type
6173 identifier-start type-start
6177 got-suffix-after-parens id-start
6180 (if (setq at-type
(if (eq backup-at-type
'prefix
)
6183 (setq type-start backup-type-start
6184 id-start backup-id-start
)
6185 (setq type-start start-pos
6186 id-start start-pos
))
6188 ;; When these flags already are set we've found specifiers that
6189 ;; unconditionally signal these attributes - backtracking doesn't
6190 ;; change that. So keep them set in that case.
6192 (setq at-type-decl backup-at-type-decl
))
6194 (setq maybe-typeless backup-maybe-typeless
))
6197 ;; This identifier is bound only in the inner let.
6198 '(setq start id-start
))))
6200 (defun c-forward-decl-or-cast-1 (preceding-token-end context last-cast-end
)
6201 ;; Move forward over a declaration or a cast if at the start of one.
6202 ;; The point is assumed to be at the start of some token. Nil is
6203 ;; returned if no declaration or cast is recognized, and the point
6204 ;; is clobbered in that case.
6206 ;; If a declaration is parsed:
6208 ;; The point is left at the first token after the first complete
6209 ;; declarator, if there is one. The return value is a cons where
6210 ;; the car is the position of the first token in the declarator. (See
6211 ;; below for the cdr.)
6214 ;; void foo (int a, char *b) stuff ...
6218 ;; unsigned int a = c_style_initializer, b;
6220 ;; unsigned int a (cplusplus_style_initializer), b;
6221 ;; car ^ ^ point (might change)
6222 ;; class Foo : public Bar {}
6224 ;; class PikeClass (int a, string b) stuff ...
6230 ;; void cplusplus_function (int x) throw (Bad);
6232 ;; Foo::Foo (int b) : Base (b) {}
6235 ;; The cdr of the return value is non-nil when a
6236 ;; `c-typedef-decl-kwds' specifier is found in the declaration.
6237 ;; Specifically it is a dotted pair (A . B) where B is t when a
6238 ;; `c-typedef-kwds' ("typedef") is present, and A is t when some
6239 ;; other `c-typedef-decl-kwds' (e.g. class, struct, enum)
6240 ;; specifier is present. I.e., (some of) the declared
6241 ;; identifier(s) are types.
6243 ;; If a cast is parsed:
6245 ;; The point is left at the first token after the closing paren of
6246 ;; the cast. The return value is `cast'. Note that the start
6247 ;; position must be at the first token inside the cast parenthesis
6250 ;; PRECEDING-TOKEN-END is the first position after the preceding
6251 ;; token, i.e. on the other side of the syntactic ws from the point.
6252 ;; Use a value less than or equal to (point-min) if the point is at
6253 ;; the first token in (the visible part of) the buffer.
6255 ;; CONTEXT is a symbol that describes the context at the point:
6256 ;; 'decl In a comma-separated declaration context (typically
6257 ;; inside a function declaration arglist).
6258 ;; '<> In an angle bracket arglist.
6259 ;; 'arglist Some other type of arglist.
6260 ;; nil Some other context or unknown context. Includes
6261 ;; within the parens of an if, for, ... construct.
6263 ;; LAST-CAST-END is the first token after the closing paren of a
6264 ;; preceding cast, or nil if none is known. If
6265 ;; `c-forward-decl-or-cast-1' is used in succession, it should be
6266 ;; the position after the closest preceding call where a cast was
6267 ;; matched. In that case it's used to discover chains of casts like
6270 ;; This function records identifier ranges on
6271 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
6272 ;; `c-record-type-identifiers' is non-nil.
6274 ;; This function might do hidden buffer changes.
6276 (let (;; `start-pos' is used below to point to the start of the
6277 ;; first type, i.e. after any leading specifiers. It might
6278 ;; also point at the beginning of the preceding syntactic
6281 ;; Set to the result of `c-forward-type'.
6283 ;; The position of the first token in what we currently
6284 ;; believe is the type in the declaration or cast, after any
6285 ;; specifiers and their associated clauses.
6287 ;; The position of the first token in what we currently
6288 ;; believe is the declarator for the first identifier. Set
6289 ;; when the type is found, and moved forward over any
6290 ;; `c-decl-hangon-kwds' and their associated clauses that
6291 ;; occurs after the type.
6293 ;; These store `at-type', `type-start' and `id-start' of the
6294 ;; identifier before the one in those variables. The previous
6295 ;; identifier might turn out to be the real type in a
6296 ;; declaration if the last one has to be the declarator in it.
6297 ;; If `backup-at-type' is nil then the other variables have
6298 ;; undefined values.
6299 backup-at-type backup-type-start backup-id-start
6300 ;; Set if we've found a specifier (apart from "typedef") that makes
6301 ;; the defined identifier(s) types.
6303 ;; Set if we've a "typedef" keyword.
6305 ;; Set if we've found a specifier that can start a declaration
6306 ;; where there's no type.
6308 ;; If a specifier is found that also can be a type prefix,
6309 ;; these flags are set instead of those above. If we need to
6310 ;; back up an identifier, they are copied to the real flag
6311 ;; variables. Thus they only take effect if we fail to
6312 ;; interpret it as a type.
6313 backup-at-type-decl backup-maybe-typeless
6314 ;; Whether we've found a declaration or a cast. We might know
6315 ;; this before we've found the type in it. It's 'ids if we've
6316 ;; found two consecutive identifiers (usually a sure sign, but
6317 ;; we should allow that in labels too), and t if we've found a
6318 ;; specifier keyword (a 100% sure sign).
6320 ;; Set when we need to back up to parse this as a declaration
6321 ;; but not as a cast.
6323 ;; For casts, the return position.
6325 ;; Save `c-record-type-identifiers' and
6326 ;; `c-record-ref-identifiers' since ranges are recorded
6327 ;; speculatively and should be thrown away if it turns out
6328 ;; that it isn't a declaration or cast.
6329 (save-rec-type-ids c-record-type-identifiers
)
6330 (save-rec-ref-ids c-record-ref-identifiers
))
6332 (while (c-forward-annotation)
6333 (c-forward-syntactic-ws))
6335 ;; Check for a type. Unknown symbols are treated as possible
6336 ;; types, but they could also be specifiers disguised through
6337 ;; macros like __INLINE__, so we recognize both types and known
6338 ;; specifiers after them too.
6340 (let* ((start (point)) kwd-sym kwd-clause-end found-type
)
6342 ;; Look for a specifier keyword clause.
6343 (when (or (looking-at c-prefix-spec-kwds-re
)
6344 (and (c-major-mode-is 'java-mode
)
6345 (looking-at "@[A-Za-z0-9]+")))
6346 (if (looking-at c-typedef-key
)
6347 (setq at-typedef t
))
6348 (setq kwd-sym
(c-keyword-sym (match-string 1)))
6350 (c-forward-keyword-clause 1)
6351 (setq kwd-clause-end
(point))))
6353 (when (setq found-type
(c-forward-type t
)) ; brace-block-too
6354 ;; Found a known or possible type or a prefix of a known type.
6357 ;; Got two identifiers with nothing but whitespace
6358 ;; between them. That can only happen in declarations.
6359 (setq at-decl-or-cast
'ids
)
6361 (when (eq at-type
'found
)
6362 ;; If the previous identifier is a found type we
6363 ;; record it as a real one; it might be some sort of
6364 ;; alias for a prefix like "unsigned".
6366 (goto-char type-start
)
6367 (let ((c-promote-possible-types t
))
6368 (c-forward-type)))))
6370 (setq backup-at-type at-type
6371 backup-type-start type-start
6372 backup-id-start id-start
6376 ;; The previous ambiguous specifier/type turned out
6377 ;; to be a type since we've parsed another one after
6378 ;; it, so clear these backup flags.
6379 backup-at-type-decl nil
6380 backup-maybe-typeless nil
))
6384 ;; Handle known specifier keywords and
6385 ;; `c-decl-hangon-kwds' which can occur after known
6388 (if (c-keyword-member kwd-sym
'c-decl-hangon-kwds
)
6389 ;; It's a hang-on keyword that can occur anywhere.
6391 (setq at-decl-or-cast t
)
6393 ;; Move the identifier start position if
6394 ;; we've passed a type.
6395 (setq id-start kwd-clause-end
)
6396 ;; Otherwise treat this as a specifier and
6397 ;; move the fallback position.
6398 (setq start-pos kwd-clause-end
))
6399 (goto-char kwd-clause-end
))
6401 ;; It's an ordinary specifier so we know that
6402 ;; anything before this can't be the type.
6403 (setq backup-at-type nil
6404 start-pos kwd-clause-end
)
6407 ;; It's ambiguous whether this keyword is a
6408 ;; specifier or a type prefix, so set the backup
6409 ;; flags. (It's assumed that `c-forward-type'
6410 ;; moved further than `c-forward-keyword-clause'.)
6412 (when (c-keyword-member kwd-sym
'c-typedef-decl-kwds
)
6413 (setq backup-at-type-decl t
))
6414 (when (c-keyword-member kwd-sym
'c-typeless-decl-kwds
)
6415 (setq backup-maybe-typeless t
)))
6417 (when (c-keyword-member kwd-sym
'c-typedef-decl-kwds
)
6418 ;; This test only happens after we've scanned a type.
6419 ;; So, with valid syntax, kwd-sym can't be 'typedef.
6420 (setq at-type-decl t
))
6421 (when (c-keyword-member kwd-sym
'c-typeless-decl-kwds
)
6422 (setq maybe-typeless t
))
6424 ;; Haven't matched a type so it's an unambiguous
6425 ;; specifier keyword and we know we're in a
6427 (setq at-decl-or-cast t
)
6429 (goto-char kwd-clause-end
))))
6431 ;; If the type isn't known we continue so that we'll jump
6432 ;; over all specifiers and type identifiers. The reason
6433 ;; to do this for a known type prefix is to make things
6434 ;; like "unsigned INT16" work.
6435 (and found-type
(not (eq found-type t
))))))
6439 ;; If a known type was found, we still need to skip over any
6440 ;; hangon keyword clauses after it. Otherwise it has already
6441 ;; been done in the loop above.
6442 (while (looking-at c-decl-hangon-key
)
6443 (c-forward-keyword-clause 1))
6444 (setq id-start
(point)))
6446 ((eq at-type
'prefix
)
6447 ;; A prefix type is itself a primitive type when it's not
6448 ;; followed by another type.
6452 ;; Got no type but set things up to continue anyway to handle
6453 ;; the various cases when a declaration doesn't start with a
6455 (setq id-start start-pos
))
6457 ((and (eq at-type
'maybe
)
6458 (c-major-mode-is 'c
++-mode
))
6459 ;; If it's C++ then check if the last "type" ends on the form
6460 ;; "foo::foo" or "foo::~foo", i.e. if it's the name of a
6461 ;; (con|de)structor.
6463 (let (name end-2 end-1
)
6464 (goto-char id-start
)
6465 (c-backward-syntactic-ws)
6466 (setq end-2
(point))
6468 (c-simple-skip-symbol-backward)
6471 (buffer-substring-no-properties (point) end-2
))
6472 ;; Cheating in the handling of syntactic ws below.
6473 (< (skip-chars-backward ":~ \t\n\r\v\f") 0))
6475 (setq end-1
(point))
6476 (c-simple-skip-symbol-backward))
6477 (>= (point) type-start
)
6478 (equal (buffer-substring-no-properties (point) end-1
)
6480 ;; It is a (con|de)structor name. In that case the
6481 ;; declaration is typeless so zap out any preceding
6482 ;; identifier(s) that we might have taken as types.
6483 (goto-char type-start
)
6486 id-start type-start
))))))
6488 ;; Check for and step over a type decl expression after the thing
6489 ;; that is or might be a type. This can't be skipped since we
6490 ;; need the correct end position of the declarator for
6491 ;; `max-type-decl-end-*'.
6492 (let ((start (point)) (paren-depth 0) pos
6493 ;; True if there's a non-open-paren match of
6494 ;; `c-type-decl-prefix-key'.
6496 ;; True if the declarator is surrounded by a parenthesis pair.
6498 ;; True if there is an identifier in the declarator.
6500 ;; True if there's a non-close-paren match of
6501 ;; `c-type-decl-suffix-key'.
6503 ;; True if there's a prefix match outside the outermost
6504 ;; paren pair that surrounds the declarator.
6505 got-prefix-before-parens
6506 ;; True if there's a suffix match outside the outermost
6507 ;; paren pair that surrounds the declarator. The value is
6508 ;; the position of the first suffix match.
6509 got-suffix-after-parens
6510 ;; True if we've parsed the type decl to a token that is
6511 ;; known to end declarations in this context.
6513 ;; The earlier values of `at-type' and `type-start' if we've
6514 ;; shifted the type backwards.
6515 identifier-type identifier-start
6516 ;; If `c-parse-and-markup-<>-arglists' is set we need to
6517 ;; turn it off during the name skipping below to avoid
6518 ;; getting `c-type' properties that might be bogus. That
6519 ;; can happen since we don't know if
6520 ;; `c-restricted-<>-arglists' will be correct inside the
6521 ;; arglist paren that gets entered.
6522 c-parse-and-markup-
<>-arglists
)
6524 (goto-char id-start
)
6526 ;; Skip over type decl prefix operators. (Note similar code in
6527 ;; `c-font-lock-declarators'.)
6528 (while (and (looking-at c-type-decl-prefix-key
)
6529 (if (and (c-major-mode-is 'c
++-mode
)
6530 (match-beginning 3))
6531 ;; If the second submatch matches in C++ then
6532 ;; we're looking at an identifier that's a
6533 ;; prefix only if it specifies a member pointer.
6534 (when (setq got-identifier
(c-forward-name))
6535 (if (looking-at "\\(::\\)")
6536 ;; We only check for a trailing "::" and
6537 ;; let the "*" that should follow be
6538 ;; matched in the next round.
6539 (progn (setq got-identifier nil
) t
)
6540 ;; It turned out to be the real identifier,
6545 (if (eq (char-after) ?\
()
6547 (setq paren-depth
(1+ paren-depth
))
6549 (unless got-prefix-before-parens
6550 (setq got-prefix-before-parens
(= paren-depth
0)))
6552 (goto-char (match-end 1)))
6553 (c-forward-syntactic-ws))
6555 (setq got-parens
(> paren-depth
0))
6557 ;; Skip over an identifier.
6559 (and (looking-at c-identifier-start
)
6560 (setq got-identifier
(c-forward-name))))
6562 ;; Skip over type decl suffix operators.
6563 (while (if (looking-at c-type-decl-suffix-key
)
6565 (if (eq (char-after) ?\
))
6566 (when (> paren-depth
0)
6567 (setq paren-depth
(1- paren-depth
))
6570 (when (if (save-match-data (looking-at "\\s\("))
6571 (c-safe (c-forward-sexp 1) t
)
6572 (goto-char (match-end 1))
6574 (when (and (not got-suffix-after-parens
)
6576 (setq got-suffix-after-parens
(match-beginning 0)))
6577 (setq got-suffix t
)))
6579 ;; No suffix matched. We might have matched the
6580 ;; identifier as a type and the open paren of a
6581 ;; function arglist as a type decl prefix. In that
6582 ;; case we should "backtrack": Reinterpret the last
6583 ;; type as the identifier, move out of the arglist and
6584 ;; continue searching for suffix operators.
6586 ;; Do this even if there's no preceding type, to cope
6587 ;; with old style function declarations in K&R C,
6588 ;; (con|de)structors in C++ and `c-typeless-decl-kwds'
6589 ;; style declarations. That isn't applicable in an
6590 ;; arglist context, though.
6591 (when (and (= paren-depth
1)
6592 (not got-prefix-before-parens
)
6593 (not (eq at-type t
))
6596 backup-maybe-typeless
6597 (when c-recognize-typeless-decls
6599 (setq pos
(c-up-list-forward (point)))
6600 (eq (char-before pos
) ?\
)))
6601 (c-fdoc-shift-type-backward)
6605 (c-forward-syntactic-ws))
6607 (when (and (or maybe-typeless backup-maybe-typeless
)
6608 (not got-identifier
)
6611 ;; Have found no identifier but `c-typeless-decl-kwds' has
6612 ;; matched so we know we're inside a declaration. The
6613 ;; preceding type must be the identifier instead.
6614 (c-fdoc-shift-type-backward))
6618 (catch 'at-decl-or-cast
6621 (when (> paren-depth
0)
6622 ;; Encountered something inside parens that isn't matched by
6623 ;; the `c-type-decl-*' regexps, so it's not a type decl
6624 ;; expression. Try to skip out to the same paren depth to
6625 ;; not confuse the cast check below.
6626 (c-safe (goto-char (scan-lists (point) 1 paren-depth
)))
6627 ;; If we've found a specifier keyword then it's a
6628 ;; declaration regardless.
6629 (throw 'at-decl-or-cast
(eq at-decl-or-cast t
)))
6632 (looking-at (cond ((eq context
'<>) "[,>]")
6636 ;; Now we've collected info about various characteristics of
6637 ;; the construct we're looking at. Below follows a decision
6638 ;; tree based on that. It's ordered to check more certain
6639 ;; signs before less certain ones.
6645 (when (and (or at-type maybe-typeless
)
6646 (not (or got-prefix got-parens
)))
6647 ;; Got another identifier directly after the type, so it's a
6649 (throw 'at-decl-or-cast t
))
6651 (when (and got-parens
6653 (not got-suffix-after-parens
)
6656 backup-maybe-typeless
))
6657 ;; Got a declaration of the form "foo bar (gnu);" where we've
6658 ;; recognized "bar" as the type and "gnu" as the declarator.
6659 ;; In this case it's however more likely that "bar" is the
6660 ;; declarator and "gnu" a function argument or initializer (if
6661 ;; `c-recognize-paren-inits' is set), since the parens around
6662 ;; "gnu" would be superfluous if it's a declarator. Shift the
6663 ;; type one step backward.
6664 (c-fdoc-shift-type-backward)))
6666 ;; Found no identifier.
6673 (when (= (point) start
)
6674 ;; Got a plain list of identifiers. If a colon follows it's
6675 ;; a valid label, or maybe a bitfield. Otherwise the last
6676 ;; one probably is the declared identifier and we should
6677 ;; back up to the previous type, providing it isn't a cast.
6678 (if (and (eq (char-after) ?
:)
6679 (not (c-major-mode-is 'java-mode
)))
6681 ;; If we've found a specifier keyword then it's a
6682 ;; declaration regardless.
6683 ((eq at-decl-or-cast t
)
6684 (throw 'at-decl-or-cast t
))
6685 ((and c-has-bitfields
6686 (eq at-decl-or-cast
'ids
)) ; bitfield.
6687 (setq backup-if-not-cast t
)
6688 (throw 'at-decl-or-cast t
)))
6690 (setq backup-if-not-cast t
)
6691 (throw 'at-decl-or-cast t
)))
6694 (when (and got-suffix
6697 ;; Got a plain list of identifiers followed by some suffix.
6698 ;; If this isn't a cast then the last identifier probably is
6699 ;; the declared one and we should back up to the previous
6701 (setq backup-if-not-cast t
)
6702 (throw 'at-decl-or-cast t
)))
6705 (when (eq at-type t
)
6706 ;; If the type is known we know that there can't be any
6707 ;; identifier somewhere else, and it's only in declarations in
6708 ;; e.g. function prototypes and in casts that the identifier may
6710 (throw 'at-decl-or-cast t
))
6712 (when (= (point) start
)
6713 ;; Only got a single identifier (parsed as a type so far).
6716 ;; Check that the identifier isn't at the start of an
6721 ;; Inside an arglist that contains declarations. If K&R
6722 ;; style declarations and parenthesis style initializers
6723 ;; aren't allowed then the single identifier must be a
6724 ;; type, else we require that it's known or found
6725 ;; (primitive types are handled above).
6726 (or (and (not c-recognize-knr-p
)
6727 (not c-recognize-paren-inits
))
6728 (memq at-type
'(known found
))))
6730 ;; Inside a template arglist. Accept known and found
6731 ;; types; other identifiers could just as well be
6732 ;; constants in C++.
6733 (memq at-type
'(known found
)))))
6734 (throw 'at-decl-or-cast t
)
6736 ;; Can't be a valid declaration or cast, but if we've found a
6737 ;; specifier it can't be anything else either, so treat it as
6738 ;; an invalid/unfinished declaration or cast.
6739 (throw 'at-decl-or-cast at-decl-or-cast
))))
6744 (not (eq at-type t
))
6747 backup-maybe-typeless
6748 (when c-recognize-typeless-decls
6749 (or (not got-suffix
)
6751 c-after-suffixed-type-maybe-decl-key
))))))
6752 ;; Got an empty paren pair and a preceding type that probably
6753 ;; really is the identifier. Shift the type backwards to make
6754 ;; the last one the identifier. This is analogous to the
6755 ;; "backtracking" done inside the `c-type-decl-suffix-key' loop
6758 ;; Exception: In addition to the conditions in that
6759 ;; "backtracking" code, do not shift backward if we're not
6760 ;; looking at either `c-after-suffixed-type-decl-key' or "[;,]".
6761 ;; Since there's no preceding type, the shift would mean that
6762 ;; the declaration is typeless. But if the regexp doesn't match
6763 ;; then we will simply fall through in the tests below and not
6764 ;; recognize it at all, so it's better to try it as an abstract
6765 ;; declarator instead.
6766 (c-fdoc-shift-type-backward)
6768 ;; Still no identifier.
6770 (when (and got-prefix
(or got-parens got-suffix
))
6771 ;; Require `got-prefix' together with either `got-parens' or
6772 ;; `got-suffix' to recognize it as an abstract declarator:
6773 ;; `got-parens' only is probably an empty function call.
6774 ;; `got-suffix' only can build an ordinary expression together
6775 ;; with the preceding identifier which we've taken as a type.
6776 ;; We could actually accept on `got-prefix' only, but that can
6777 ;; easily occur temporarily while writing an expression so we
6778 ;; avoid that case anyway. We could do a better job if we knew
6779 ;; the point when the fontification was invoked.
6780 (throw 'at-decl-or-cast t
))
6786 got-suffix-after-parens
6787 (eq (char-after got-suffix-after-parens
) ?\
())
6788 ;; Got a type, no declarator but a paren suffix. I.e. it's a
6789 ;; normal function call after all (or perhaps a C++ style object
6790 ;; instantiation expression).
6791 (throw 'at-decl-or-cast nil
))))
6794 (when at-decl-or-cast
6795 ;; By now we've located the type in the declaration that we know
6797 (throw 'at-decl-or-cast t
))
6800 (when (and got-identifier
6802 (looking-at c-after-suffixed-type-decl-key
)
6806 (not (eq at-type t
)))
6807 ;; Shift the type backward in the case that there's a
6808 ;; single identifier inside parens. That can only
6809 ;; occur in K&R style function declarations so it's
6810 ;; more likely that it really is a function call.
6811 ;; Therefore we only do this after
6812 ;; `c-after-suffixed-type-decl-key' has matched.
6813 (progn (c-fdoc-shift-type-backward) t
)
6814 got-suffix-after-parens
))
6815 ;; A declaration according to `c-after-suffixed-type-decl-key'.
6816 (throw 'at-decl-or-cast t
))
6819 (when (and (or got-prefix
(not got-parens
))
6820 (memq at-type
'(t known
)))
6821 ;; It's a declaration if a known type precedes it and it can't be a
6823 (throw 'at-decl-or-cast t
))
6825 ;; If we get here we can't tell if this is a type decl or a normal
6826 ;; expression by looking at it alone. (That's under the assumption
6827 ;; that normal expressions always can look like type decl expressions,
6828 ;; which isn't really true but the cases where it doesn't hold are so
6829 ;; uncommon (e.g. some placements of "const" in C++) it's not worth
6830 ;; the effort to look for them.)
6832 (unless (or at-decl-end
(looking-at "=[^=]"))
6833 ;; If this is a declaration it should end here or its initializer(*)
6834 ;; should start here, so check for allowed separation tokens. Note
6835 ;; that this rule doesn't work e.g. with a K&R arglist after a
6838 ;; *) Don't check for C++ style initializers using parens
6839 ;; since those already have been matched as suffixes.
6841 ;; If `at-decl-or-cast' is then we've found some other sign that
6842 ;; it's a declaration or cast, so then it's probably an
6843 ;; invalid/unfinished one.
6844 (throw 'at-decl-or-cast at-decl-or-cast
))
6846 ;; Below are tests that only should be applied when we're certain to
6847 ;; not have parsed halfway through an expression.
6850 (when (memq at-type
'(t known
))
6851 ;; The expression starts with a known type so treat it as a
6853 (throw 'at-decl-or-cast t
))
6856 (when (and (c-major-mode-is 'c
++-mode
)
6857 ;; In C++ we check if the identifier is a known type, since
6858 ;; (con|de)structors use the class name as identifier.
6859 ;; We've always shifted over the identifier as a type and
6860 ;; then backed up again in this case.
6862 (or (memq identifier-type
'(found known
))
6863 (and (eq (char-after identifier-start
) ?~
)
6864 ;; `at-type' probably won't be 'found for
6865 ;; destructors since the "~" is then part of the
6866 ;; type name being checked against the list of
6867 ;; known types, so do a check without that
6870 (goto-char (1+ identifier-start
))
6871 (c-forward-syntactic-ws)
6872 (c-with-syntax-table
6873 c-identifier-syntax-table
6874 (looking-at c-known-type-key
)))
6876 (goto-char (1+ identifier-start
))
6877 ;; We have already parsed the type earlier,
6878 ;; so it'd be possible to cache the end
6879 ;; position instead of redoing it here, but
6880 ;; then we'd need to keep track of another
6881 ;; position everywhere.
6882 (c-check-type (point)
6883 (progn (c-forward-type)
6885 (throw 'at-decl-or-cast t
))
6890 (when (and got-prefix-before-parens
6892 (or at-decl-end
(looking-at "=[^=]"))
6895 ;; Got something like "foo * bar;". Since we're not inside an
6896 ;; arglist it would be a meaningless expression because the
6897 ;; result isn't used. We therefore choose to recognize it as
6898 ;; a declaration. Do not allow a suffix since it could then
6899 ;; be a function call.
6900 (throw 'at-decl-or-cast t
))
6903 (when (and (or got-suffix-after-parens
6904 (looking-at "=[^=]"))
6906 (not (eq context
'arglist
)))
6907 ;; Got something like "a (*b) (c);" or "a (b) = c;". It could
6908 ;; be an odd expression or it could be a declaration. Treat
6909 ;; it as a declaration if "a" has been used as a type
6910 ;; somewhere else (if it's a known type we won't get here).
6911 (throw 'at-decl-or-cast t
)))
6916 (and (eq context
'decl
)
6917 (not c-recognize-paren-inits
)
6918 (or got-parens got-suffix
))))
6919 ;; Got a type followed by an abstract declarator. If `got-prefix'
6920 ;; is set it's something like "a *" without anything after it. If
6921 ;; `got-parens' or `got-suffix' is set it's "a()", "a[]", "a()[]",
6922 ;; or similar, which we accept only if the context rules out
6924 (throw 'at-decl-or-cast t
)))
6926 ;; If we had a complete symbol table here (which rules out
6927 ;; `c-found-types') we should return t due to the disambiguation rule
6928 ;; (in at least C++) that anything that can be parsed as a declaration
6929 ;; is a declaration. Now we're being more defensive and prefer to
6930 ;; highlight things like "foo (bar);" as a declaration only if we're
6931 ;; inside an arglist that contains declarations.
6932 (eq context
'decl
))))
6934 ;; The point is now after the type decl expression.
6937 ;; Check for a cast.
6942 ;; Should be the first type/identifier in a cast paren.
6943 (> preceding-token-end
(point-min))
6944 (memq (char-before preceding-token-end
) c-cast-parens
)
6946 ;; The closing paren should follow.
6948 (c-forward-syntactic-ws)
6949 (looking-at "\\s\)"))
6951 ;; There should be a primary expression after it.
6954 (c-forward-syntactic-ws)
6955 (setq cast-end
(point))
6956 (and (looking-at c-primary-expr-regexp
)
6958 (setq pos
(match-end 0))
6960 ;; Check if the expression begins with a prefix keyword.
6962 (if (match-beginning 1)
6963 ;; Expression begins with an ambiguous operator. Treat
6964 ;; it as a cast if it's a type decl or if we've
6965 ;; recognized the type somewhere else.
6967 (memq at-type
'(t known found
)))
6968 ;; Unless it's a keyword, it's the beginning of a primary
6970 (not (looking-at c-keywords-regexp
)))))
6971 ;; If `c-primary-expr-regexp' matched a nonsymbol token, check
6972 ;; that it matched a whole one so that we don't e.g. confuse
6973 ;; the operator '-' with '->'. It's ok if it matches further,
6974 ;; though, since it e.g. can match the float '.5' while the
6975 ;; operator regexp only matches '.'.
6976 (or (not (looking-at c-nonsymbol-token-regexp
))
6977 (<= (match-end 0) pos
))))
6979 ;; There should either be a cast before it or something that isn't an
6980 ;; identifier or close paren.
6981 (> preceding-token-end
(point-min))
6983 (goto-char (1- preceding-token-end
))
6984 (or (eq (point) last-cast-end
)
6986 (c-backward-syntactic-ws)
6987 (if (< (skip-syntax-backward "w_") 0)
6988 ;; It's a symbol. Accept it only if it's one of the
6989 ;; keywords that can precede an expression (without
6990 ;; surrounding parens).
6991 (looking-at c-simple-stmt-key
)
6993 ;; Check that it isn't a close paren (block close is ok,
6995 (not (memq (char-before) '(?\
) ?\
])))
6996 ;; Check that it isn't a nonsymbol identifier.
6997 (not (c-on-identifier)))))))))
7000 (when (and c-record-type-identifiers at-type
(not (eq at-type t
)))
7001 (let ((c-promote-possible-types t
))
7002 (goto-char type-start
)
7005 (goto-char cast-end
)
7009 ;; We're at a declaration. Highlight the type and the following
7012 (when backup-if-not-cast
7013 (c-fdoc-shift-type-backward t
))
7015 (when (and (eq context
'decl
) (looking-at ","))
7016 ;; Make sure to propagate the `c-decl-arg-start' property to
7017 ;; the next argument if it's set in this one, to cope with
7018 ;; interactive refontification.
7019 (c-put-c-type-property (point) 'c-decl-arg-start
))
7021 (when (and c-record-type-identifiers at-type
(not (eq at-type t
)))
7022 (let ((c-promote-possible-types t
))
7024 (goto-char type-start
)
7028 (and (or at-type-decl at-typedef
)
7029 (cons at-type-decl at-typedef
))))
7032 ;; False alarm. Restore the recorded ranges.
7033 (setq c-record-type-identifiers save-rec-type-ids
7034 c-record-ref-identifiers save-rec-ref-ids
)
7037 (defun c-forward-label (&optional assume-markup preceding-token-end limit
)
7038 ;; Assuming that point is at the beginning of a token, check if it starts a
7039 ;; label and if so move over it and return non-nil (t in default situations,
7040 ;; specific symbols (see below) for interesting situations), otherwise don't
7041 ;; move and return nil. "Label" here means "most things with a colon".
7043 ;; More precisely, a "label" is regarded as one of:
7044 ;; (i) a goto target like "foo:" - returns the symbol `goto-target';
7045 ;; (ii) A case label - either the entire construct "case FOO:", or just the
7046 ;; bare "case", should the colon be missing. We return t;
7047 ;; (iii) a keyword which needs a colon, like "default:" or "private:"; We
7049 ;; (iv) One of QT's "extended" C++ variants of
7050 ;; "private:"/"protected:"/"public:"/"more:" looking like "public slots:".
7051 ;; Returns the symbol `qt-2kwds-colon'.
7052 ;; (v) QT's construct "signals:". Returns the symbol `qt-1kwd-colon'.
7053 ;; (vi) One of the keywords matched by `c-opt-extra-label-key' (without any
7054 ;; colon). Currently (2006-03), this applies only to Objective C's
7055 ;; keywords "@private", "@protected", and "@public". Returns t.
7057 ;; One of the things which will NOT be recognized as a label is a bit-field
7058 ;; element of a struct, something like "int foo:5".
7060 ;; The end of the label is taken to be just after the colon, or the end of
7061 ;; the first submatch in `c-opt-extra-label-key'. The point is directly
7062 ;; after the end on return. The terminating char gets marked with
7063 ;; `c-decl-end' to improve recognition of the following declaration or
7066 ;; If ASSUME-MARKUP is non-nil, it's assumed that the preceding
7067 ;; label, if any, has already been marked up like that.
7069 ;; If PRECEDING-TOKEN-END is given, it should be the first position
7070 ;; after the preceding token, i.e. on the other side of the
7071 ;; syntactic ws from the point. Use a value less than or equal to
7072 ;; (point-min) if the point is at the first token in (the visible
7073 ;; part of) the buffer.
7075 ;; The optional LIMIT limits the forward scan for the colon.
7077 ;; This function records the ranges of the label symbols on
7078 ;; `c-record-ref-identifiers' if `c-record-type-identifiers' (!) is
7081 ;; This function might do hidden buffer changes.
7083 (let ((start (point))
7086 macro-start
; if we're in one.
7090 ;; "case" or "default" (Doesn't apply to AWK).
7091 ((looking-at c-label-kwds-regexp
)
7092 (let ((kwd-end (match-end 1)))
7093 ;; Record only the keyword itself for fontification, since in
7094 ;; case labels the following is a constant expression and not
7096 (when c-record-type-identifiers
7097 (c-record-ref-id (cons (match-beginning 1) kwd-end
)))
7099 ;; Find the label end.
7102 (if (and (c-syntactic-re-search-forward
7103 ;; Stop on chars that aren't allowed in expressions,
7104 ;; and on operator chars that would be meaningless
7105 ;; there. FIXME: This doesn't cope with ?: operators.
7106 "[;{=,@]\\|\\(\\=\\|[^:]\\):\\([^:]\\|\\'\\)"
7108 (match-beginning 2))
7110 (progn ; there's a proper :
7111 (goto-char (match-beginning 2)) ; just after the :
7112 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7115 ;; It's an unfinished label. We consider the keyword enough
7116 ;; to recognize it as a label, so that it gets fontified.
7117 ;; Leave the point at the end of it, but don't put any
7118 ;; `c-decl-end' marker.
7122 ;; @private, @protected, @public, in Objective C, or similar.
7123 ((and c-opt-extra-label-key
7124 (looking-at c-opt-extra-label-key
))
7125 ;; For a `c-opt-extra-label-key' match, we record the whole
7126 ;; thing for fontification. That's to get the leading '@' in
7127 ;; Objective-C protection labels fontified.
7128 (goto-char (match-end 1))
7129 (when c-record-type-identifiers
7130 (c-record-ref-id (cons (match-beginning 1) (point))))
7131 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7132 (setq label-type t
))
7134 ;; All other cases of labels.
7135 ((and c-recognize-colon-labels
; nil for AWK and IDL, otherwise t.
7137 ;; A colon label must have something before the colon.
7138 (not (eq (char-after) ?
:))
7140 ;; Check that we're not after a token that can't precede a label.
7142 ;; Trivially succeeds when there's no preceding token.
7143 ;; Succeeds when we're at a virtual semicolon.
7144 (if preceding-token-end
7145 (<= preceding-token-end
(point-min))
7147 (c-backward-syntactic-ws)
7148 (setq preceding-token-end
(point))
7152 ;; Check if we're after a label, if we're after a closing
7153 ;; paren that belong to statement, and with
7154 ;; `c-label-prefix-re'. It's done in different order
7155 ;; depending on `assume-markup' since the checks have
7156 ;; different expensiveness.
7159 (eq (c-get-char-property (1- preceding-token-end
) 'c-type
)
7163 (goto-char (1- preceding-token-end
))
7164 (c-beginning-of-current-token)
7165 (or (looking-at c-label-prefix-re
)
7166 (looking-at c-block-stmt-1-key
)))
7168 (and (eq (char-before preceding-token-end
) ?\
))
7169 (c-after-conditional)))
7173 (goto-char (1- preceding-token-end
))
7174 (c-beginning-of-current-token)
7175 (or (looking-at c-label-prefix-re
)
7176 (looking-at c-block-stmt-1-key
)))
7179 ((eq (char-before preceding-token-end
) ?\
))
7180 (c-after-conditional))
7182 ((eq (char-before preceding-token-end
) ?
:)
7183 ;; Might be after another label, so check it recursively.
7186 (goto-char (1- preceding-token-end
))
7187 ;; Essentially the same as the
7188 ;; `c-syntactic-re-search-forward' regexp below.
7190 (save-excursion (and (c-beginning-of-macro)
7192 (if macro-start
(narrow-to-region macro-start
(point-max)))
7193 (c-syntactic-skip-backward "^-]:?;}=*/%&|,<>!@+" nil t
)
7194 ;; Note: the following should work instead of the
7195 ;; narrow-to-region above. Investigate why not,
7196 ;; sometime. ACM, 2006-03-31.
7197 ;; (c-syntactic-skip-backward "^-]:?;}=*/%&|,<>!@+"
7200 ;; If the caller turned on recording for us,
7201 ;; it shouldn't apply when we check the
7203 c-record-type-identifiers
)
7204 ;; A label can't start at a cpp directive. Check for
7205 ;; this, since c-forward-syntactic-ws would foul up on it.
7206 (unless (and c-opt-cpp-prefix
(looking-at c-opt-cpp-prefix
))
7207 (c-forward-syntactic-ws)
7208 (c-forward-label nil pte start
))))))))))
7210 ;; Point is still at the beginning of the possible label construct.
7212 ;; Check that the next nonsymbol token is ":", or that we're in one
7213 ;; of QT's "slots" declarations. Allow '(' for the sake of macro
7214 ;; arguments. FIXME: Should build this regexp from the language
7217 ;; public: protected: private:
7219 (c-major-mode-is 'c
++-mode
)
7220 (search-forward-regexp
7221 "\\=p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\>[^_]" nil t
)
7222 (progn (backward-char)
7223 (c-forward-syntactic-ws limit
)
7224 (looking-at ":\\([^:]\\|\\'\\)"))) ; A single colon.
7226 (setq label-type t
))
7227 ;; QT double keyword like "protected slots:" or goto target.
7228 ((progn (goto-char start
) nil
))
7229 ((when (c-syntactic-re-search-forward
7230 "[ \t\n[:?;{=*/%&|,<>!@+-]" limit t t
) ; not at EOB
7232 (setq label-end
(point))
7234 (and (c-major-mode-is 'c
++-mode
)
7236 "\\(p\\(r\\(ivate\\|otected\\)\\|ublic\\)\\|more\\)\\>"
7237 (buffer-substring start
(point)))))
7238 (c-forward-syntactic-ws limit
)
7240 ((looking-at ":\\([^:]\\|\\'\\)") ; A single colon.
7243 (if (or (string= "signals" ; Special QT macro
7244 (setq kwd
(buffer-substring-no-properties start label-end
)))
7245 (string= "Q_SIGNALS" kwd
))
7249 (search-forward-regexp "\\=\\(slots\\|Q_SLOTS\\)\\>" limit t
)
7250 (progn (c-forward-syntactic-ws limit
)
7251 (looking-at ":\\([^:]\\|\\'\\)"))) ; A single colon
7253 (setq label-type
'qt-2kwds-colon
)))))))
7256 (narrow-to-region start
(point))
7258 ;; Check that `c-nonlabel-token-key' doesn't match anywhere.
7262 (when (looking-at c-nonlabel-token-key
)
7264 (setq label-type nil
)
7265 (throw 'check-label nil
))
7266 (and (c-safe (c-forward-sexp)
7267 (c-forward-syntactic-ws)
7271 ;; Record the identifiers in the label for fontification, unless
7272 ;; it begins with `c-label-kwds' in which case the following
7273 ;; identifiers are part of a (constant) expression that
7274 ;; shouldn't be fontified.
7275 (when (and c-record-type-identifiers
7276 (progn (goto-char start
)
7277 (not (looking-at c-label-kwds-regexp
))))
7278 (while (c-syntactic-re-search-forward c-symbol-key nil t
)
7279 (c-record-ref-id (cons (match-beginning 0)
7282 (c-put-c-type-property (1- (point-max)) 'c-decl-end
)
7283 (goto-char (point-max)))))
7290 (defun c-forward-objc-directive ()
7291 ;; Assuming the point is at the beginning of a token, try to move
7292 ;; forward to the end of the Objective-C directive that starts
7293 ;; there. Return t if a directive was fully recognized, otherwise
7294 ;; the point is moved as far as one could be successfully parsed and
7297 ;; This function records identifier ranges on
7298 ;; `c-record-type-identifiers' and `c-record-ref-identifiers' if
7299 ;; `c-record-type-identifiers' is non-nil.
7301 ;; This function might do hidden buffer changes.
7303 (let ((start (point))
7305 (c-promote-possible-types t
)
7306 ;; Turn off recognition of angle bracket arglists while parsing
7307 ;; types here since the protocol reference list might then be
7308 ;; considered part of the preceding name or superclass-name.
7309 c-recognize-
<>-arglists
)
7314 (c-make-keywords-re t
7315 (append (c-lang-const c-protection-kwds objc
)
7318 (goto-char (match-end 1))
7324 (c-make-keywords-re t
7325 '("@interface" "@implementation" "@protocol")
7328 ;; Handle the name of the class itself.
7330 ; (c-forward-token-2) ; 2006/1/13 This doesn't move if the token's
7332 (goto-char (match-end 0))
7337 ;; Look for ": superclass-name" or "( category-name )".
7338 (when (looking-at "[:\(]")
7339 (setq start-char
(char-after))
7341 (c-forward-syntactic-ws)
7342 (unless (c-forward-type) (throw 'break nil
))
7343 (when (eq start-char ?\
()
7344 (unless (eq (char-after) ?\
)) (throw 'break nil
))
7346 (c-forward-syntactic-ws)))
7348 ;; Look for a protocol reference list.
7349 (if (eq (char-after) ?
<)
7350 (let ((c-recognize-<>-arglists t
)
7351 (c-parse-and-markup-<>-arglists t
)
7352 c-restricted-
<>-arglists
)
7353 (c-forward-<>-arglist t
))
7357 (c-backward-syntactic-ws)
7358 (c-clear-c-type-property start
(1- (point)) 'c-decl-end
)
7359 (c-put-c-type-property (1- (point)) 'c-decl-end
)
7362 (c-clear-c-type-property start
(point) 'c-decl-end
)
7365 (defun c-beginning-of-inheritance-list (&optional lim
)
7366 ;; Go to the first non-whitespace after the colon that starts a
7367 ;; multiple inheritance introduction. Optional LIM is the farthest
7368 ;; back we should search.
7370 ;; This function might do hidden buffer changes.
7371 (c-with-syntax-table c
++-template-syntax-table
7372 (c-backward-token-2 0 t lim
)
7373 (while (and (or (looking-at c-symbol-start
)
7374 (looking-at "[<,]\\|::"))
7375 (zerop (c-backward-token-2 1 t lim
))))))
7377 (defun c-in-method-def-p ()
7378 ;; Return nil if we aren't in a method definition, otherwise the
7379 ;; position of the initial [+-].
7381 ;; This function might do hidden buffer changes.
7384 (and c-opt-method-key
7385 (looking-at c-opt-method-key
)
7389 ;; Contributed by Kevin Ryde <user42@zip.com.au>.
7390 (defun c-in-gcc-asm-p ()
7391 ;; Return non-nil if point is within a gcc \"asm\" block.
7393 ;; This should be called with point inside an argument list.
7395 ;; Only one level of enclosing parentheses is considered, so for
7396 ;; instance `nil' is returned when in a function call within an asm
7399 ;; This function might do hidden buffer changes.
7401 (and c-opt-asm-stmt-key
7404 (backward-up-list 1)
7405 (c-beginning-of-statement-1 (point-min) nil t
)
7406 (looking-at c-opt-asm-stmt-key
))))
7408 (defun c-at-toplevel-p ()
7409 "Return a determination as to whether point is \"at the top level\".
7410 Informally, \"at the top level\" is anywhere where you can write
7413 More precisely, being at the top-level means that point is either
7414 outside any enclosing block (such as a function definition), or
7415 directly inside a class, namespace or other block that contains
7416 another declaration level.
7418 If point is not at the top-level (e.g. it is inside a method
7419 definition), then nil is returned. Otherwise, if point is at a
7420 top-level not enclosed within a class definition, t is returned.
7421 Otherwise, a 2-vector is returned where the zeroth element is the
7422 buffer position of the start of the class declaration, and the first
7423 element is the buffer position of the enclosing class's opening
7426 Note that this function might do hidden buffer changes. See the
7427 comment at the start of cc-engine.el for more info."
7428 (let ((paren-state (c-parse-state)))
7429 (or (not (c-most-enclosing-brace paren-state
))
7430 (c-search-uplist-for-classkey paren-state
))))
7432 (defun c-just-after-func-arglist-p (&optional lim
)
7433 ;; Return non-nil if the point is in the region after the argument
7434 ;; list of a function and its opening brace (or semicolon in case it
7435 ;; got no body). If there are K&R style argument declarations in
7436 ;; that region, the point has to be inside the first one for this
7437 ;; function to recognize it.
7439 ;; If successful, the point is moved to the first token after the
7440 ;; function header (see `c-forward-decl-or-cast-1' for details) and
7441 ;; the position of the opening paren of the function arglist is
7444 ;; The point is clobbered if not successful.
7446 ;; LIM is used as bound for backward buffer searches.
7448 ;; This function might do hidden buffer changes.
7450 (let ((beg (point)) end id-start
)
7452 (eq (c-beginning-of-statement-1 lim
) 'same
)
7454 (not (or (c-major-mode-is 'objc-mode
)
7455 (c-forward-objc-directive)))
7458 (car-safe (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
)))
7461 ;; There should not be a '=' or ',' between beg and the
7462 ;; start of the declaration since that means we were in the
7463 ;; "expression part" of the declaration.
7465 (not (looking-at "[=,]")))
7468 ;; Check that there's an arglist paren in the
7470 (goto-char id-start
)
7471 (cond ((eq (char-after) ?\
()
7472 ;; The declarator is a paren expression, so skip past it
7473 ;; so that we don't get stuck on that instead of the
7474 ;; function arglist.
7476 ((and c-opt-op-identifier-prefix
7477 (looking-at c-opt-op-identifier-prefix
))
7478 ;; Don't trip up on "operator ()".
7479 (c-forward-token-2 2 t
)))
7480 (and (< (point) beg
)
7481 (c-syntactic-re-search-forward "(" beg t t
)
7484 (defun c-in-knr-argdecl (&optional lim
)
7485 ;; Return the position of the first argument declaration if point is
7486 ;; inside a K&R style argument declaration list, nil otherwise.
7487 ;; `c-recognize-knr-p' is not checked. If LIM is non-nil, it's a
7488 ;; position that bounds the backward search for the argument list.
7490 ;; Point must be within a possible K&R region, e.g. just before a top-level
7491 ;; "{". It must be outside of parens and brackets. The test can return
7492 ;; false positives otherwise.
7494 ;; This function might do hidden buffer changes.
7498 ;; If we're in a macro, our search range is restricted to it. Narrow to
7499 ;; the searchable range.
7500 (let* ((macro-start (c-query-macro-start))
7501 (lim (max (or lim
(point-min)) (or macro-start
(point-min))))
7502 before-lparen after-rparen
7503 (pp-count-out 20)) ; Max number of paren/brace constructs before we give up
7504 (narrow-to-region lim
(c-point 'eol
))
7506 ;; Search backwards for the defun's argument list. We give up if we
7507 ;; encounter a "}" (end of a previous defun) or BOB.
7509 ;; The criterion for a paren structure being the arg list is:
7510 ;; o - there is non-WS stuff after it but before any "{"; AND
7511 ;; o - the token after it isn't a ";" AND
7512 ;; o - it is preceded by either an identifier (the function name) or
7513 ;; a macro expansion like "DEFUN (...)"; AND
7514 ;; o - its content is a non-empty comma-separated list of identifiers
7515 ;; (an empty arg list won't have a knr region).
7517 ;; The following snippet illustrates these rules:
7518 ;; int foo (bar, baz, yuk)
7520 ;; int (*baz) (my_type) ;
7521 ;; int (*) (void) (*yuk) (void) ;
7525 (while (> pp-count-out
0) ; go back one paren/bracket pair each time.
7526 (setq pp-count-out
(1- pp-count-out
))
7527 (c-syntactic-skip-backward "^)]}")
7528 (cond ((eq (char-before) ?\
))
7529 (setq after-rparen
(point)))
7530 ((eq (char-before) ?\
])
7531 (setq after-rparen nil
))
7532 (t ; either } (hit previous defun) or no more parens/brackets
7536 ;; We're inside a paren. Could it be our argument list....?
7540 (goto-char after-rparen
)
7541 (unless (c-go-list-backward) (throw 'knr nil
)) ;
7542 ;; FIXME!!! What about macros between the parens? 2007/01/20
7543 (setq before-lparen
(point)))
7545 ;; It can't be the arg list if next token is ; or {
7546 (progn (goto-char after-rparen
)
7547 (c-forward-syntactic-ws)
7548 (not (memq (char-after) '(?\
; ?\{))))
7550 ;; Is the thing preceding the list an identifier (the
7551 ;; function name), or a macro expansion?
7553 (goto-char before-lparen
)
7554 (eq (c-backward-token-2) 0)
7555 (or (c-on-identifier)
7556 (and (eq (char-after) ?\
))
7557 (c-go-up-list-backward)
7558 (eq (c-backward-token-2) 0)
7559 (c-on-identifier))))
7561 ;; Have we got a non-empty list of comma-separated
7564 (goto-char before-lparen
)
7565 (c-forward-token-2) ; to first token inside parens
7570 (while (eq (char-after) ?\
,)
7572 (unless (c-on-identifier) (throw 'id-list nil
))
7573 (c-forward-token-2))
7574 (eq (char-after) ?\
))))))
7576 ;; ...Yes. We've identified the function's argument list.
7578 (progn (goto-char after-rparen
)
7579 (c-forward-syntactic-ws)
7582 ;; ...No. The current parens aren't the function's arg list.
7583 (goto-char before-lparen
))
7585 (or (c-go-list-backward) ; backwards over [ .... ]
7586 (throw 'knr nil
)))))))))
7588 (defun c-skip-conditional ()
7589 ;; skip forward over conditional at point, including any predicate
7590 ;; statements in parentheses. No error checking is performed.
7592 ;; This function might do hidden buffer changes.
7593 (c-forward-sexp (cond
7595 ((looking-at (concat "\\<else"
7596 "\\([ \t\n]\\|\\\\\n\\)+"
7597 "if\\>\\([^_]\\|$\\)"))
7599 ;; do, else, try, finally
7600 ((looking-at (concat "\\<\\("
7601 "do\\|else\\|try\\|finally"
7602 "\\)\\>\\([^_]\\|$\\)"))
7604 ;; for, if, while, switch, catch, synchronized, foreach
7607 (defun c-after-conditional (&optional lim
)
7608 ;; If looking at the token after a conditional then return the
7609 ;; position of its start, otherwise return nil.
7611 ;; This function might do hidden buffer changes.
7613 (and (zerop (c-backward-token-2 1 t lim
))
7614 (or (looking-at c-block-stmt-1-key
)
7615 (and (eq (char-after) ?\
()
7616 (zerop (c-backward-token-2 1 t lim
))
7617 (looking-at c-block-stmt-2-key
)))
7620 (defun c-after-special-operator-id (&optional lim
)
7621 ;; If the point is after an operator identifier that isn't handled
7622 ;; like an ordinary symbol (i.e. like "operator =" in C++) then the
7623 ;; position of the start of that identifier is returned. nil is
7624 ;; returned otherwise. The point may be anywhere in the syntactic
7625 ;; whitespace after the last token of the operator identifier.
7627 ;; This function might do hidden buffer changes.
7629 (and c-overloadable-operators-regexp
7630 (zerop (c-backward-token-2 1 nil lim
))
7631 (looking-at c-overloadable-operators-regexp
)
7632 (or (not c-opt-op-identifier-prefix
)
7634 (zerop (c-backward-token-2 1 nil lim
))
7635 (looking-at c-opt-op-identifier-prefix
)))
7638 (defsubst c-backward-to-block-anchor
(&optional lim
)
7639 ;; Assuming point is at a brace that opens a statement block of some
7640 ;; kind, move to the proper anchor point for that block. It might
7641 ;; need to be adjusted further by c-add-stmt-syntax, but the
7642 ;; position at return is suitable as start position for that
7645 ;; This function might do hidden buffer changes.
7646 (unless (= (point) (c-point 'boi
))
7647 (let ((start (c-after-conditional lim
)))
7649 (goto-char start
)))))
7651 (defsubst c-backward-to-decl-anchor
(&optional lim
)
7652 ;; Assuming point is at a brace that opens the block of a top level
7653 ;; declaration of some kind, move to the proper anchor point for
7656 ;; This function might do hidden buffer changes.
7657 (unless (= (point) (c-point 'boi
))
7658 (c-beginning-of-statement-1 lim
)))
7660 (defun c-search-decl-header-end ()
7661 ;; Search forward for the end of the "header" of the current
7662 ;; declaration. That's the position where the definition body
7663 ;; starts, or the first variable initializer, or the ending
7664 ;; semicolon. I.e. search forward for the closest following
7665 ;; (syntactically relevant) '{', '=' or ';' token. Point is left
7666 ;; _after_ the first found token, or at point-max if none is found.
7668 ;; This function might do hidden buffer changes.
7670 (let ((base (point)))
7671 (if (c-major-mode-is 'c
++-mode
)
7673 ;; In C++ we need to take special care to handle operator
7674 ;; tokens and those pesky template brackets.
7676 (c-syntactic-re-search-forward "[;{<=]" nil
'move t t
)
7678 (c-end-of-current-token base
)
7679 ;; Handle operator identifiers, i.e. ignore any
7680 ;; operator token preceded by "operator".
7682 (and (c-safe (c-backward-sexp) t
)
7683 (looking-at c-opt-op-identifier-prefix
)))
7684 (and (eq (char-before) ?
<)
7685 (c-with-syntax-table c
++-template-syntax-table
7686 (if (c-safe (goto-char (c-up-list-forward (point))))
7688 (goto-char (point-max))
7690 (setq base
(point)))
7693 (c-syntactic-re-search-forward "[;{=]" nil
'move t t
)
7694 (c-end-of-current-token base
))
7695 (setq base
(point))))))
7697 (defun c-beginning-of-decl-1 (&optional lim
)
7698 ;; Go to the beginning of the current declaration, or the beginning
7699 ;; of the previous one if already at the start of it. Point won't
7700 ;; be moved out of any surrounding paren. Return a cons cell of the
7701 ;; form (MOVE . KNR-POS). MOVE is like the return value from
7702 ;; `c-beginning-of-statement-1'. If point skipped over some K&R
7703 ;; style argument declarations (and they are to be recognized) then
7704 ;; KNR-POS is set to the start of the first such argument
7705 ;; declaration, otherwise KNR-POS is nil. If LIM is non-nil, it's a
7706 ;; position that bounds the backward search.
7708 ;; NB: Cases where the declaration continues after the block, as in
7709 ;; "struct foo { ... } bar;", are currently recognized as two
7710 ;; declarations, e.g. "struct foo { ... }" and "bar;" in this case.
7712 ;; This function might do hidden buffer changes.
7714 (let* ((start (point))
7715 (last-stmt-start (point))
7716 (move (c-beginning-of-statement-1 lim nil t
)))
7718 ;; `c-beginning-of-statement-1' stops at a block start, but we
7719 ;; want to continue if the block doesn't begin a top level
7720 ;; construct, i.e. if it isn't preceded by ';', '}', ':', bob,
7721 ;; or an open paren.
7722 (let ((beg (point)) tentative-move
)
7723 ;; Go back one "statement" each time round the loop until we're just
7724 ;; after a ;, }, or :, or at BOB or the start of a macro or start of
7725 ;; an ObjC method. This will move over a multiple declaration whose
7726 ;; components are comma separated.
7728 ;; Must check with c-opt-method-key in ObjC mode.
7729 (not (and c-opt-method-key
7730 (looking-at c-opt-method-key
)))
7731 (/= last-stmt-start
(point))
7733 (c-backward-syntactic-ws lim
)
7734 (not (memq (char-before) '(?\
; ?} ?: nil))))
7737 (not (looking-at "\\s(")))
7738 ;; Check that we don't move from the first thing in a
7739 ;; macro to its header.
7740 (not (eq (setq tentative-move
7741 (c-beginning-of-statement-1 lim nil t
))
7743 (setq last-stmt-start beg
7745 move tentative-move
))
7748 (when c-recognize-knr-p
7749 (let ((fallback-pos (point)) knr-argdecl-start
)
7750 ;; Handle K&R argdecls. Back up after the "statement" jumped
7751 ;; over by `c-beginning-of-statement-1', unless it was the
7752 ;; function body, in which case we're sitting on the opening
7753 ;; brace now. Then test if we're in a K&R argdecl region and
7754 ;; that we started at the other side of the first argdecl in
7756 (unless (eq (char-after) ?
{)
7757 (goto-char last-stmt-start
))
7758 (if (and (setq knr-argdecl-start
(c-in-knr-argdecl lim
))
7759 (< knr-argdecl-start start
)
7761 (goto-char knr-argdecl-start
)
7762 (not (eq (c-beginning-of-statement-1 lim nil t
) 'macro
))))
7764 (cons (if (eq (char-after fallback-pos
) ?
{)
7768 (goto-char fallback-pos
))))
7770 ;; `c-beginning-of-statement-1' counts each brace block as a separate
7771 ;; statement, so the result will be 'previous if we've moved over any.
7772 ;; So change our result back to 'same if necessary.
7774 ;; If they were brace list initializers we might not have moved over a
7775 ;; declaration boundary though, so change it to 'same if we've moved
7776 ;; past a '=' before '{', but not ';'. (This ought to be integrated
7777 ;; into `c-beginning-of-statement-1', so we avoid this extra pass which
7778 ;; potentially can search over a large amount of text.). Take special
7779 ;; pains not to get mislead by C++'s "operator=", and the like.
7780 (if (and (eq move
'previous
)
7781 (c-with-syntax-table (if (c-major-mode-is 'c
++-mode
)
7782 c
++-template-syntax-table
7787 (while ; keep going back to "[;={"s until we either find
7788 ; no more, or get to one which isn't an "operator ="
7789 (and (c-syntactic-re-search-forward "[;={]" start t t t
)
7790 (eq (char-before) ?
=)
7791 c-overloadable-operators-regexp
7792 c-opt-op-identifier-prefix
7794 (eq (c-backward-token-2) 0)
7795 (looking-at c-overloadable-operators-regexp
)
7796 (eq (c-backward-token-2) 0)
7797 (looking-at c-opt-op-identifier-prefix
))))
7798 (eq (char-before) ?
=))
7799 (c-syntactic-re-search-forward "[;{]" start t t
)
7800 (eq (char-before) ?
{)
7801 (c-safe (goto-char (c-up-list-forward (point))) t
)
7802 (not (c-syntactic-re-search-forward ";" start t t
))))))
7806 (defun c-end-of-decl-1 ()
7807 ;; Assuming point is at the start of a declaration (as detected by
7808 ;; e.g. `c-beginning-of-decl-1'), go to the end of it. Unlike
7809 ;; `c-beginning-of-decl-1', this function handles the case when a
7810 ;; block is followed by identifiers in e.g. struct declarations in C
7811 ;; or C++. If a proper end was found then t is returned, otherwise
7812 ;; point is moved as far as possible within the current sexp and nil
7813 ;; is returned. This function doesn't handle macros; use
7814 ;; `c-end-of-macro' instead in those cases.
7816 ;; This function might do hidden buffer changes.
7817 (let ((start (point))
7818 (decl-syntax-table (if (c-major-mode-is 'c
++-mode
)
7819 c
++-template-syntax-table
7822 (c-search-decl-header-end)
7824 (when (and c-recognize-knr-p
7825 (eq (char-before) ?\
;)
7826 (c-in-knr-argdecl start
))
7827 ;; Stopped at the ';' in a K&R argdecl section which is
7828 ;; detected using the same criteria as in
7829 ;; `c-beginning-of-decl-1'. Move to the following block
7831 (c-syntactic-re-search-forward "{" nil
'move t
))
7833 (when (eq (char-before) ?
{)
7834 ;; Encountered a block in the declaration. Jump over it.
7836 (goto-char (c-up-list-forward (point)))
7837 (error (goto-char (point-max))
7838 (throw 'return nil
)))
7839 (if (or (not c-opt-block-decls-with-vars-key
)
7841 (c-with-syntax-table decl-syntax-table
7842 (let ((lim (point)))
7845 ;; Check for `c-opt-block-decls-with-vars-key'
7846 ;; before the first paren.
7847 (c-syntactic-re-search-forward
7848 (concat "[;=\(\[{]\\|\\("
7849 c-opt-block-decls-with-vars-key
7853 (not (eq (char-before) ?_
))
7854 ;; Check that the first following paren is
7856 (c-syntactic-re-search-forward "[;=\(\[{]"
7858 (eq (char-before) ?
{)))))))
7859 ;; The declaration doesn't have any of the
7860 ;; `c-opt-block-decls-with-vars' keywords in the
7861 ;; beginning, so it ends here at the end of the block.
7864 (c-with-syntax-table decl-syntax-table
7866 (if (eq (char-before) ?\
;)
7868 (c-syntactic-re-search-forward ";" nil
'move t
))))
7871 (defun c-looking-at-decl-block (containing-sexp goto-start
&optional limit
)
7872 ;; Assuming the point is at an open brace, check if it starts a
7873 ;; block that contains another declaration level, i.e. that isn't a
7874 ;; statement block or a brace list, and if so return non-nil.
7876 ;; If the check is successful, the return value is the start of the
7877 ;; keyword that tells what kind of construct it is, i.e. typically
7878 ;; what `c-decl-block-key' matched. Also, if GOTO-START is set then
7879 ;; the point will be at the start of the construct, before any
7880 ;; leading specifiers, otherwise it's at the returned position.
7882 ;; The point is clobbered if the check is unsuccessful.
7884 ;; CONTAINING-SEXP is the position of the open of the surrounding
7885 ;; paren, or nil if none.
7887 ;; The optional LIMIT limits the backward search for the start of
7888 ;; the construct. It's assumed to be at a syntactically relevant
7891 ;; If any template arglists are found in the searched region before
7892 ;; the open brace, they get marked with paren syntax.
7894 ;; This function might do hidden buffer changes.
7896 (let ((open-brace (point)) kwd-start first-specifier-pos
)
7897 (c-syntactic-skip-backward c-block-prefix-charset limit t
)
7899 (when (and c-recognize-
<>-arglists
7900 (eq (char-before) ?
>))
7901 ;; Could be at the end of a template arglist.
7902 (let ((c-parse-and-markup-<>-arglists t
)
7903 (c-disallow-comma-in-<>-arglists
7904 (and containing-sexp
7905 (not (eq (char-after containing-sexp
) ?
{)))))
7907 (c-backward-<>-arglist nil limit
)
7909 (c-syntactic-skip-backward c-block-prefix-charset limit t
)
7910 (eq (char-before) ?
>))))))
7912 ;; Note: Can't get bogus hits inside template arglists below since they
7913 ;; have gotten paren syntax above.
7915 ;; If `goto-start' is set we begin by searching for the
7916 ;; first possible position of a leading specifier list.
7917 ;; The `c-decl-block-key' search continues from there since
7918 ;; we know it can't match earlier.
7920 (when (c-syntactic-re-search-forward c-symbol-start
7922 (goto-char (setq first-specifier-pos
(match-beginning 0)))
7927 ((c-syntactic-re-search-forward c-decl-block-key open-brace t t t
)
7928 (goto-char (setq kwd-start
(match-beginning 0)))
7931 ;; Found a keyword that can't be a type?
7934 ;; Can be a type too, in which case it's the return type of a
7935 ;; function (under the assumption that no declaration level
7936 ;; block construct starts with a type).
7937 (not (c-forward-type))
7939 ;; Jumped over a type, but it could be a declaration keyword
7940 ;; followed by the declared identifier that we've jumped over
7941 ;; instead (e.g. in "class Foo {"). If it indeed is a type
7942 ;; then we should be at the declarator now, so check for a
7943 ;; valid declarator start.
7945 ;; Note: This doesn't cope with the case when a declared
7946 ;; identifier is followed by e.g. '(' in a language where '('
7947 ;; also might be part of a declarator expression. Currently
7948 ;; there's no such language.
7949 (not (or (looking-at c-symbol-start
)
7950 (looking-at c-type-decl-prefix-key
)))))
7952 ;; In Pike a list of modifiers may be followed by a brace
7953 ;; to make them apply to many identifiers. Note that the
7954 ;; match data will be empty on return in this case.
7955 ((and (c-major-mode-is 'pike-mode
)
7957 (goto-char open-brace
)
7958 (= (c-backward-token-2) 0))
7959 (looking-at c-specifier-key
)
7960 ;; Use this variant to avoid yet another special regexp.
7961 (c-keyword-member (c-keyword-sym (match-string 1))
7963 (setq kwd-start
(point))
7969 ;; Back up over any preceding specifiers and their clauses
7970 ;; by going forward from `first-specifier-pos', which is the
7971 ;; earliest possible position where the specifier list can
7974 (goto-char first-specifier-pos
)
7976 (while (< (point) kwd-start
)
7977 (if (looking-at c-symbol-key
)
7978 ;; Accept any plain symbol token on the ground that
7979 ;; it's a specifier masked through a macro (just
7980 ;; like `c-forward-decl-or-cast-1' skip forward over
7983 ;; Could be more restrictive wrt invalid keywords,
7984 ;; but that'd only occur in invalid code so there's
7985 ;; no use spending effort on it.
7986 (let ((end (match-end 0)))
7987 (unless (c-forward-keyword-clause 0)
7989 (c-forward-syntactic-ws)))
7991 ;; Can't parse a declaration preamble and is still
7992 ;; before `kwd-start'. That means `first-specifier-pos'
7993 ;; was in some earlier construct. Search again.
7994 (if (c-syntactic-re-search-forward c-symbol-start
7996 (goto-char (setq first-specifier-pos
(match-beginning 0)))
7997 ;; Got no preamble before the block declaration keyword.
7998 (setq first-specifier-pos kwd-start
))))
8000 (goto-char first-specifier-pos
))
8001 (goto-char kwd-start
))
8005 (defun c-search-uplist-for-classkey (paren-state)
8006 ;; Check if the closest containing paren sexp is a declaration
8007 ;; block, returning a 2 element vector in that case. Aref 0
8008 ;; contains the bufpos at boi of the class key line, and aref 1
8009 ;; contains the bufpos of the open brace. This function is an
8010 ;; obsolete wrapper for `c-looking-at-decl-block'.
8012 ;; This function might do hidden buffer changes.
8013 (let ((open-paren-pos (c-most-enclosing-brace paren-state
)))
8014 (when open-paren-pos
8016 (goto-char open-paren-pos
)
8017 (when (and (eq (char-after) ?
{)
8018 (c-looking-at-decl-block
8019 (c-safe-position open-paren-pos paren-state
)
8021 (back-to-indentation)
8022 (vector (point) open-paren-pos
))))))
8024 (defmacro c-pull-open-brace
(ps)
8025 ;; Pull the next open brace from PS (which has the form of paren-state),
8026 ;; skipping over any brace pairs. Returns NIL when PS is exhausted.
8028 (while (consp (car ,ps
))
8029 (setq ,ps
(cdr ,ps
)))
8031 (setq ,ps
(cdr ,ps
)))))
8033 (defun c-most-enclosing-decl-block (paren-state)
8034 ;; Return the buffer position of the most enclosing decl-block brace (in the
8035 ;; sense of c-looking-at-decl-block) in the PAREN-STATE structure, or nil if
8037 (let* ((open-brace (c-pull-open-brace paren-state
))
8038 (next-open-brace (c-pull-open-brace paren-state
)))
8039 (while (and open-brace
8041 (goto-char open-brace
)
8042 (not (c-looking-at-decl-block next-open-brace nil
))))
8043 (setq open-brace next-open-brace
8044 next-open-brace
(c-pull-open-brace paren-state
)))
8047 (defun c-inside-bracelist-p (containing-sexp paren-state
)
8048 ;; return the buffer position of the beginning of the brace list
8049 ;; statement if we're inside a brace list, otherwise return nil.
8050 ;; CONTAINING-SEXP is the buffer pos of the innermost containing
8051 ;; paren. PAREN-STATE is the remainder of the state of enclosing
8054 ;; N.B.: This algorithm can potentially get confused by cpp macros
8055 ;; placed in inconvenient locations. It's a trade-off we make for
8058 ;; This function might do hidden buffer changes.
8060 ;; This will pick up brace list declarations.
8063 (goto-char containing-sexp
)
8066 (if (and (or (looking-at c-brace-list-key
)
8067 (progn (c-forward-sexp -
1)
8068 (looking-at c-brace-list-key
)))
8069 (setq bracepos
(c-down-list-forward (point)))
8070 (not (c-crosses-statement-barrier-p (point)
8073 ;; this will pick up array/aggregate init lists, even if they are nested.
8076 ;; Pike can have class definitions anywhere, so we must
8077 ;; check for the class key here.
8078 (and (c-major-mode-is 'pike-mode
)
8080 bufpos braceassignp lim next-containing
)
8081 (while (and (not bufpos
)
8084 (if (consp (car paren-state
))
8085 (setq lim
(cdr (car paren-state
))
8086 paren-state
(cdr paren-state
))
8087 (setq lim
(car paren-state
)))
8089 (setq next-containing
(car paren-state
)
8090 paren-state
(cdr paren-state
))))
8091 (goto-char containing-sexp
)
8092 (if (c-looking-at-inexpr-block next-containing next-containing
)
8093 ;; We're in an in-expression block of some kind. Do not
8094 ;; check nesting. We deliberately set the limit to the
8095 ;; containing sexp, so that c-looking-at-inexpr-block
8096 ;; doesn't check for an identifier before it.
8097 (setq containing-sexp nil
)
8098 ;; see if the open brace is preceded by = or [...] in
8099 ;; this statement, but watch out for operator=
8100 (setq braceassignp
'dontknow
)
8101 (c-backward-token-2 1 t lim
)
8102 ;; Checks to do only on the first sexp before the brace.
8103 (when (and c-opt-inexpr-brace-list-key
8104 (eq (char-after) ?\
[))
8105 ;; In Java, an initialization brace list may follow
8106 ;; directly after "new Foo[]", so check for a "new"
8108 (while (eq braceassignp
'dontknow
)
8110 (cond ((/= (c-backward-token-2 1 t lim
) 0) nil
)
8111 ((looking-at c-opt-inexpr-brace-list-key
) t
)
8112 ((looking-at "\\sw\\|\\s_\\|[.[]")
8113 ;; Carry on looking if this is an
8114 ;; identifier (may contain "." in Java)
8115 ;; or another "[]" sexp.
8118 ;; Checks to do on all sexps before the brace, up to the
8119 ;; beginning of the statement.
8120 (while (eq braceassignp
'dontknow
)
8121 (cond ((eq (char-after) ?\
;)
8122 (setq braceassignp nil
))
8124 (looking-at class-key
))
8125 (setq braceassignp nil
))
8126 ((eq (char-after) ?
=)
8127 ;; We've seen a =, but must check earlier tokens so
8128 ;; that it isn't something that should be ignored.
8129 (setq braceassignp
'maybe
)
8130 (while (and (eq braceassignp
'maybe
)
8131 (zerop (c-backward-token-2 1 t lim
)))
8134 ;; Check for operator =
8135 ((and c-opt-op-identifier-prefix
8136 (looking-at c-opt-op-identifier-prefix
))
8138 ;; Check for `<opchar>= in Pike.
8139 ((and (c-major-mode-is 'pike-mode
)
8140 (or (eq (char-after) ?
`)
8141 ;; Special case for Pikes
8142 ;; `[]=, since '[' is not in
8143 ;; the punctuation class.
8144 (and (eq (char-after) ?\
[)
8145 (eq (char-before) ?
`))))
8147 ((looking-at "\\s.") 'maybe
)
8148 ;; make sure we're not in a C++ template
8149 ;; argument assignment
8151 (c-major-mode-is 'c
++-mode
)
8153 (let ((here (point))
8155 (skip-chars-backward "^<>")
8157 (and (eq (char-before) ?
<)
8158 (not (c-crosses-statement-barrier-p
8160 (not (c-in-literal))
8164 (if (and (eq braceassignp
'dontknow
)
8165 (/= (c-backward-token-2 1 t lim
) 0))
8166 (setq braceassignp nil
)))
8167 (if (not braceassignp
)
8168 (if (eq (char-after) ?\
;)
8169 ;; Brace lists can't contain a semicolon, so we're done.
8170 (setq containing-sexp nil
)
8172 (setq containing-sexp next-containing
8174 next-containing nil
))
8175 ;; we've hit the beginning of the aggregate list
8176 (c-beginning-of-statement-1
8177 (c-most-enclosing-brace paren-state
))
8178 (setq bufpos
(point))))
8183 (defun c-looking-at-special-brace-list (&optional lim
)
8184 ;; If we're looking at the start of a pike-style list, ie `({Â })',
8185 ;; `([Â ])', `(<Â >)' etc, a cons of a cons of its starting and ending
8186 ;; positions and its entry in c-special-brace-lists is returned, nil
8187 ;; otherwise. The ending position is nil if the list is still open.
8188 ;; LIM is the limit for forward search. The point may either be at
8189 ;; the `(' or at the following paren character. Tries to check the
8190 ;; matching closer, but assumes it's correct if no balanced paren is
8191 ;; found (i.e. the case `({ ... } ... )' is detected as _not_ being
8192 ;; a special brace list).
8194 ;; This function might do hidden buffer changes.
8195 (if c-special-brace-lists
8200 (c-forward-syntactic-ws)
8201 (if (eq (char-after) ?\
()
8204 (c-forward-syntactic-ws)
8205 (setq inner-beg
(point))
8206 (setq type
(assq (char-after) c-special-brace-lists
)))
8207 (if (setq type
(assq (char-after) c-special-brace-lists
))
8209 (setq inner-beg
(point))
8210 (c-backward-syntactic-ws)
8212 (setq beg
(if (eq (char-after) ?\
()
8220 (= (char-before) ?\
)))
8222 (goto-char inner-beg
)
8223 (if (looking-at "\\s(")
8224 ;; Check balancing of the inner paren
8229 ;; If the inner char isn't a paren then
8230 ;; we can't check balancing, so just
8231 ;; check the char before the outer
8235 (c-backward-syntactic-ws)
8236 (= (char-before) (cdr type
)))))
8237 (if (or (/= (char-syntax (char-before)) ?\
))
8239 (c-forward-syntactic-ws)
8242 (cons (cons beg end
) type
))
8243 (cons (list beg
) type
)))))
8246 (defun c-looking-at-bos (&optional lim
)
8247 ;; Return non-nil if between two statements or declarations, assuming
8248 ;; point is not inside a literal or comment.
8250 ;; Obsolete - `c-at-statement-start-p' or `c-at-expression-start-p'
8251 ;; are recommended instead.
8253 ;; This function might do hidden buffer changes.
8254 (c-at-statement-start-p))
8255 (make-obsolete 'c-looking-at-bos
'c-at-statement-start-p
"22.1")
8257 (defun c-looking-at-inexpr-block (lim containing-sexp
&optional check-at-end
)
8258 ;; Return non-nil if we're looking at the beginning of a block
8259 ;; inside an expression. The value returned is actually a cons of
8260 ;; either 'inlambda, 'inexpr-statement or 'inexpr-class and the
8261 ;; position of the beginning of the construct.
8263 ;; LIM limits the backward search. CONTAINING-SEXP is the start
8264 ;; position of the closest containing list. If it's nil, the
8265 ;; containing paren isn't used to decide whether we're inside an
8266 ;; expression or not. If both LIM and CONTAINING-SEXP are used, LIM
8267 ;; needs to be farther back.
8269 ;; If CHECK-AT-END is non-nil then extra checks at the end of the
8270 ;; brace block might be done. It should only be used when the
8271 ;; construct can be assumed to be complete, i.e. when the original
8272 ;; starting position was further down than that.
8274 ;; This function might do hidden buffer changes.
8277 (let ((res 'maybe
) passed-paren
8278 (closest-lim (or containing-sexp lim
(point-min)))
8279 ;; Look at the character after point only as a last resort
8280 ;; when we can't disambiguate.
8281 (block-follows (and (eq (char-after) ?
{) (point))))
8283 (while (and (eq res
'maybe
)
8284 (progn (c-backward-syntactic-ws)
8285 (> (point) closest-lim
))
8287 (progn (backward-char)
8288 (looking-at "[\]\).]\\|\\w\\|\\s_"))
8289 (c-safe (forward-char)
8290 (goto-char (scan-sexps (point) -
1))))
8293 (if (looking-at c-keywords-regexp
)
8294 (let ((kw-sym (c-keyword-sym (match-string 1))))
8297 (c-keyword-member kw-sym
'c-inexpr-class-kwds
))
8298 (and (not (eq passed-paren ?\
[))
8299 (or (not (looking-at c-class-key
))
8300 ;; If the class definition is at the start of
8301 ;; a statement, we don't consider it an
8302 ;; in-expression class.
8303 (let ((prev (point)))
8305 (= (c-backward-token-2 1 nil closest-lim
) 0)
8306 (eq (char-syntax (char-after)) ?w
))
8307 (setq prev
(point)))
8309 (not (c-at-statement-start-p)))
8310 ;; Also, in Pike we treat it as an
8311 ;; in-expression class if it's used in an
8312 ;; object clone expression.
8315 (c-major-mode-is 'pike-mode
)
8316 (progn (goto-char block-follows
)
8317 (zerop (c-forward-token-2 1 t
)))
8318 (eq (char-after) ?\
())))
8319 (cons 'inexpr-class
(point))))
8320 ((c-keyword-member kw-sym
'c-inexpr-block-kwds
)
8321 (when (not passed-paren
)
8322 (cons 'inexpr-statement
(point))))
8323 ((c-keyword-member kw-sym
'c-lambda-kwds
)
8324 (when (or (not passed-paren
)
8325 (eq passed-paren ?\
())
8326 (cons 'inlambda
(point))))
8327 ((c-keyword-member kw-sym
'c-block-stmt-kwds
)
8332 (if (looking-at "\\s(")
8334 (if (and (eq passed-paren ?\
[)
8335 (eq (char-after) ?\
[))
8336 ;; Accept several square bracket sexps for
8337 ;; Java array initializations.
8339 (setq passed-paren
(char-after))
8344 (when (and c-recognize-paren-inexpr-blocks
8347 (eq (char-after containing-sexp
) ?\
())
8348 (goto-char containing-sexp
)
8349 (if (or (save-excursion
8350 (c-backward-syntactic-ws lim
)
8351 (and (> (point) (or lim
(point-min)))
8353 (and c-special-brace-lists
8354 (c-looking-at-special-brace-list)))
8356 (cons 'inexpr-statement
(point))))
8360 (defun c-looking-at-inexpr-block-backward (paren-state)
8361 ;; Returns non-nil if we're looking at the end of an in-expression
8362 ;; block, otherwise the same as `c-looking-at-inexpr-block'.
8363 ;; PAREN-STATE is the paren state relevant at the current position.
8365 ;; This function might do hidden buffer changes.
8367 ;; We currently only recognize a block.
8368 (let ((here (point))
8369 (elem (car-safe paren-state
))
8371 (when (and (consp elem
)
8372 (progn (goto-char (cdr elem
))
8373 (c-forward-syntactic-ws here
)
8375 (goto-char (car elem
))
8376 (if (setq paren-state
(cdr paren-state
))
8377 (setq containing-sexp
(car-safe paren-state
)))
8378 (c-looking-at-inexpr-block (c-safe-position containing-sexp
8380 containing-sexp
)))))
8382 (defun c-at-macro-vsemi-p (&optional pos
)
8383 ;; Is there a "virtual semicolon" at POS or point?
8384 ;; (See cc-defs.el for full details of "virtual semicolons".)
8386 ;; This is true when point is at the last non syntactic WS position on the
8387 ;; line, there is a macro call last on the line, and this particular macro's
8388 ;; name is defined by the regexp `c-vs-macro-regexp' as not needing a
8397 c-macro-with-semi-re
8398 (not (c-in-literal))
8399 (eq (skip-chars-backward " \t") 0)
8401 ;; Check we've got nothing after this except comments and empty lines
8402 ;; joined by escaped EOLs.
8403 (skip-chars-forward " \t") ; always returns non-nil.
8405 (while ; go over 1 block comment per iteration.
8407 (looking-at "\\(\\\\[\n\r][ \t]*\\)*")
8408 (goto-char (match-end 0))
8410 ((looking-at c-block-comment-start-regexp
)
8411 (and (forward-comment 1)
8412 (skip-chars-forward " \t"))) ; always returns non-nil
8413 ((looking-at c-line-comment-start-regexp
)
8420 (progn (c-backward-syntactic-ws)
8423 ;; Check for one of the listed macros being before point.
8424 (or (not (eq (char-before) ?\
)))
8425 (when (c-go-list-backward)
8426 (c-backward-syntactic-ws)
8428 (c-simple-skip-symbol-backward)
8429 (looking-at c-macro-with-semi-re
)))))
8431 (defun c-macro-vsemi-status-unknown-p () t
) ; See cc-defs.el.
8434 ;; `c-guess-basic-syntax' and the functions that precedes it below
8435 ;; implements the main decision tree for determining the syntactic
8436 ;; analysis of the current line of code.
8438 ;; Dynamically bound to t when `c-guess-basic-syntax' is called during
8439 ;; auto newline analysis.
8440 (defvar c-auto-newline-analysis nil
)
8442 (defun c-brace-anchor-point (bracepos)
8443 ;; BRACEPOS is the position of a brace in a construct like "namespace
8444 ;; Bar {". Return the anchor point in this construct; this is the
8445 ;; earliest symbol on the brace's line which isn't earlier than
8448 ;; Currently (2007-08-17), "like namespace" means "matches
8449 ;; c-other-block-decl-kwds". It doesn't work with "class" or "struct"
8450 ;; or anything like that.
8452 (let ((boi (c-point 'boi bracepos
)))
8453 (goto-char bracepos
)
8454 (while (and (> (point) boi
)
8455 (not (looking-at c-other-decl-block-key
)))
8456 (c-backward-token-2))
8457 (if (> (point) boi
) (point) boi
))))
8459 (defsubst c-add-syntax
(symbol &rest args
)
8460 ;; A simple function to prepend a new syntax element to
8461 ;; `c-syntactic-context'. Using `setq' on it is unsafe since it
8462 ;; should always be dynamically bound but since we read it first
8463 ;; we'll fail properly anyway if this function is misused.
8464 (setq c-syntactic-context
(cons (cons symbol args
)
8465 c-syntactic-context
)))
8467 (defsubst c-append-syntax
(symbol &rest args
)
8468 ;; Like `c-add-syntax' but appends to the end of the syntax list.
8469 ;; (Normally not necessary.)
8470 (setq c-syntactic-context
(nconc c-syntactic-context
8471 (list (cons symbol args
)))))
8473 (defun c-add-stmt-syntax (syntax-symbol
8478 ;; Add the indicated SYNTAX-SYMBOL to `c-syntactic-context', extending it as
8479 ;; needed with further syntax elements of the types `substatement',
8480 ;; `inexpr-statement', `arglist-cont-nonempty', `statement-block-intro', and
8481 ;; `defun-block-intro'.
8483 ;; Do the generic processing to anchor the given syntax symbol on
8484 ;; the preceding statement: Skip over any labels and containing
8485 ;; statements on the same line, and then search backward until we
8486 ;; find a statement or block start that begins at boi without a
8487 ;; label or comment.
8489 ;; Point is assumed to be at the prospective anchor point for the
8490 ;; given SYNTAX-SYMBOL. More syntax entries are added if we need to
8491 ;; skip past open parens and containing statements. Most of the added
8492 ;; syntax elements will get the same anchor point - the exception is
8493 ;; for an anchor in a construct like "namespace"[*] - this is as early
8494 ;; as possible in the construct but on the same line as the {.
8496 ;; [*] i.e. with a keyword matching c-other-block-decl-kwds.
8498 ;; SYNTAX-EXTRA-ARGS are a list of the extra arguments for the
8499 ;; syntax symbol. They are appended after the anchor point.
8501 ;; If STOP-AT-BOI-ONLY is nil, we can stop in the middle of the line
8502 ;; if the current statement starts there.
8504 ;; Note: It's not a problem if PAREN-STATE "overshoots"
8505 ;; CONTAINING-SEXP, i.e. contains info about parens further down.
8507 ;; This function might do hidden buffer changes.
8509 (if (= (point) (c-point 'boi
))
8510 ;; This is by far the most common case, so let's give it special
8512 (apply 'c-add-syntax syntax-symbol
(point) syntax-extra-args
)
8514 (let ((syntax-last c-syntactic-context
)
8515 (boi (c-point 'boi
))
8516 ;; Set when we're on a label, so that we don't stop there.
8517 ;; FIXME: To be complete we should check if we're on a label
8518 ;; now at the start.
8521 ;; Use point as the anchor point for "namespace", "extern", etc.
8522 (apply 'c-add-syntax syntax-symbol
8523 (if (rassq syntax-symbol c-other-decl-block-key-in-symbols-alist
)
8527 ;; Loop while we have to back out of containing blocks.
8530 (catch 'back-up-block
8532 ;; Loop while we have to back up statements.
8533 (while (or (/= (point) boi
)
8535 (looking-at c-comment-start-regexp
))
8537 ;; Skip past any comments that stands between the
8538 ;; statement start and boi.
8539 (let ((savepos (point)))
8540 (while (and (/= savepos boi
)
8541 (c-backward-single-comment))
8542 (setq savepos
(point)
8543 boi
(c-point 'boi
)))
8544 (goto-char savepos
))
8546 ;; Skip to the beginning of this statement or backward
8548 (let ((old-pos (point))
8550 (step-type (c-beginning-of-statement-1 containing-sexp
)))
8551 (setq boi
(c-point 'boi
)
8552 on-label
(eq step-type
'label
))
8554 (cond ((= (point) old-pos
)
8555 ;; If we didn't move we're at the start of a block and
8556 ;; have to continue outside it.
8557 (throw 'back-up-block t
))
8559 ((and (eq step-type
'up
)
8560 (>= (point) old-boi
)
8561 (looking-at "else\\>[^_]")
8564 (looking-at "if\\>[^_]")))
8565 ;; Special case to avoid deeper and deeper indentation
8566 ;; of "else if" clauses.
8569 ((and (not stop-at-boi-only
)
8570 (/= old-pos old-boi
)
8571 (memq step-type
'(up previous
)))
8572 ;; If stop-at-boi-only is nil, we shouldn't back up
8573 ;; over previous or containing statements to try to
8574 ;; reach boi, so go back to the last position and
8577 (throw 'back-up-block nil
))
8580 (if (and (not stop-at-boi-only
)
8581 (memq step-type
'(up previous beginning
)))
8582 ;; If we've moved into another statement then we
8583 ;; should no longer try to stop in the middle of a
8585 (setq stop-at-boi-only t
))
8587 ;; Record this as a substatement if we skipped up one
8589 (when (eq step-type
'up
)
8590 (c-add-syntax 'substatement nil
))))
8595 ;; Now we have to go out of this block.
8596 (goto-char containing-sexp
)
8598 ;; Don't stop in the middle of a special brace list opener
8600 (when c-special-brace-lists
8601 (let ((special-list (c-looking-at-special-brace-list)))
8602 (when (and special-list
8603 (< (car (car special-list
)) (point)))
8604 (setq containing-sexp
(car (car special-list
)))
8605 (goto-char containing-sexp
))))
8607 (setq paren-state
(c-whack-state-after containing-sexp paren-state
)
8608 containing-sexp
(c-most-enclosing-brace paren-state
)
8611 ;; Analyze the construct in front of the block we've stepped out
8612 ;; from and add the right syntactic element for it.
8613 (let ((paren-pos (point))
8614 (paren-char (char-after))
8617 (if (eq paren-char ?\
()
8618 ;; Stepped out of a parenthesis block, so we're in an
8621 (when (/= paren-pos boi
)
8622 (if (and c-recognize-paren-inexpr-blocks
8624 (c-backward-syntactic-ws containing-sexp
)
8625 (or (not (looking-at "\\>"))
8626 (not (c-on-identifier))))
8628 (goto-char (1+ paren-pos
))
8629 (c-forward-syntactic-ws)
8630 (eq (char-after) ?
{)))
8631 ;; Stepped out of an in-expression statement. This
8632 ;; syntactic element won't get an anchor pos.
8633 (c-add-syntax 'inexpr-statement
)
8635 ;; A parenthesis normally belongs to an arglist.
8636 (c-add-syntax 'arglist-cont-nonempty nil paren-pos
)))
8640 (1+ containing-sexp
)
8642 (setq step-type
'same
8645 ;; Stepped out of a brace block.
8646 (setq step-type
(c-beginning-of-statement-1 containing-sexp
)
8647 on-label
(eq step-type
'label
))
8649 (if (and (eq step-type
'same
)
8650 (/= paren-pos
(point)))
8654 (goto-char paren-pos
)
8655 (setq inexpr
(c-looking-at-inexpr-block
8656 (c-safe-position containing-sexp paren-state
)
8658 (c-add-syntax (if (eq (car inexpr
) 'inlambda
)
8660 'statement-block-intro
)
8662 ((looking-at c-other-decl-block-key
)
8664 (cdr (assoc (match-string 1)
8665 c-other-decl-block-key-in-symbols-alist
))
8666 (max (c-point 'boi paren-pos
) (point))))
8667 (t (c-add-syntax 'defun-block-intro nil
))))
8669 (c-add-syntax 'statement-block-intro nil
)))
8671 (if (= paren-pos boi
)
8672 ;; Always done if the open brace was at boi. The
8673 ;; c-beginning-of-statement-1 call above is necessary
8674 ;; anyway, to decide the type of block-intro to add.
8675 (goto-char paren-pos
)
8676 (setq boi
(c-point 'boi
)))
8679 ;; Fill in the current point as the anchor for all the symbols
8681 (let ((p c-syntactic-context
) q
)
8682 (while (not (eq p syntax-last
))
8683 (setq q
(cdr (car p
))) ; e.g. (nil 28) [from (arglist-cont-nonempty nil 28)]
8691 (defun c-add-class-syntax (symbol
8692 containing-decl-open
8693 containing-decl-start
8696 ;; The inclass and class-close syntactic symbols are added in
8697 ;; several places and some work is needed to fix everything.
8698 ;; Therefore it's collected here.
8700 ;; This function might do hidden buffer changes.
8701 (goto-char containing-decl-open
)
8702 (if (and (eq symbol
'inclass
) (= (point) (c-point 'boi
)))
8704 (c-add-syntax symbol containing-decl-open
)
8705 containing-decl-open
)
8706 (goto-char containing-decl-start
)
8707 ;; Ought to use `c-add-stmt-syntax' instead of backing up to boi
8708 ;; here, but we have to do like this for compatibility.
8709 (back-to-indentation)
8710 (c-add-syntax symbol
(point))
8711 (if (and (c-keyword-member containing-decl-kwd
8712 'c-inexpr-class-kwds
)
8713 (/= containing-decl-start
(c-point 'boi containing-decl-start
)))
8714 (c-add-syntax 'inexpr-class
))
8717 (defun c-guess-continued-construct (indent-point
8719 beg-of-same-or-containing-stmt
8722 ;; This function contains the decision tree reached through both
8723 ;; cases 18 and 10. It's a continued statement or top level
8724 ;; construct of some kind.
8726 ;; This function might do hidden buffer changes.
8728 (let (special-brace-list placeholder
)
8729 (goto-char indent-point
)
8730 (skip-chars-forward " \t")
8733 ;; (CASE A removed.)
8734 ;; CASE B: open braces for class or brace-lists
8735 ((setq special-brace-list
8736 (or (and c-special-brace-lists
8737 (c-looking-at-special-brace-list))
8738 (eq char-after-ip ?
{)))
8741 ;; CASE B.1: class-open
8743 (and (eq (char-after) ?
{)
8744 (c-looking-at-decl-block containing-sexp t
)
8745 (setq beg-of-same-or-containing-stmt
(point))))
8746 (c-add-syntax 'class-open beg-of-same-or-containing-stmt
))
8748 ;; CASE B.2: brace-list-open
8749 ((or (consp special-brace-list
)
8751 (goto-char beg-of-same-or-containing-stmt
)
8752 (c-syntactic-re-search-forward "=\\([^=]\\|$\\)"
8753 indent-point t t t
)))
8754 ;; The most semantically accurate symbol here is
8755 ;; brace-list-open, but we normally report it simply as a
8756 ;; statement-cont. The reason is that one normally adjusts
8757 ;; brace-list-open for brace lists as top-level constructs,
8758 ;; and brace lists inside statements is a completely different
8759 ;; context. C.f. case 5A.3.
8760 (c-beginning-of-statement-1 containing-sexp
)
8761 (c-add-stmt-syntax (if c-auto-newline-analysis
8762 ;; Turn off the dwim above when we're
8763 ;; analyzing the nature of the brace
8764 ;; for the auto newline feature.
8768 containing-sexp paren-state
))
8770 ;; CASE B.3: The body of a function declared inside a normal
8771 ;; block. Can occur e.g. in Pike and when using gcc
8772 ;; extensions, but watch out for macros followed by blocks.
8773 ;; C.f. cases E, 16F and 17G.
8774 ((and (not (c-at-statement-start-p))
8775 (eq (c-beginning-of-statement-1 containing-sexp nil nil t
)
8778 (let ((c-recognize-typeless-decls nil
))
8779 ;; Turn off recognition of constructs that lacks a
8780 ;; type in this case, since that's more likely to be
8781 ;; a macro followed by a block.
8782 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
8783 (c-add-stmt-syntax 'defun-open nil t
8784 containing-sexp paren-state
))
8786 ;; CASE B.4: Continued statement with block open. The most
8787 ;; accurate analysis is perhaps `statement-cont' together with
8788 ;; `block-open' but we play DWIM and use `substatement-open'
8789 ;; instead. The rationale is that this typically is a macro
8790 ;; followed by a block which makes it very similar to a
8791 ;; statement with a substatement block.
8793 (c-add-stmt-syntax 'substatement-open nil nil
8794 containing-sexp paren-state
))
8797 ;; CASE C: iostream insertion or extraction operator
8798 ((and (looking-at "\\(<<\\|>>\\)\\([^=]\\|$\\)")
8800 (goto-char beg-of-same-or-containing-stmt
)
8801 ;; If there is no preceding streamop in the statement
8802 ;; then indent this line as a normal statement-cont.
8803 (when (c-syntactic-re-search-forward
8804 "\\(<<\\|>>\\)\\([^=]\\|$\\)" indent-point
'move t t
)
8805 (c-add-syntax 'stream-op
(c-point 'boi
))
8808 ;; CASE E: In the "K&R region" of a function declared inside a
8809 ;; normal block. C.f. case B.3.
8810 ((and (save-excursion
8811 ;; Check that the next token is a '{'. This works as
8812 ;; long as no language that allows nested function
8813 ;; definitions allows stuff like member init lists, K&R
8814 ;; declarations or throws clauses there.
8816 ;; Note that we do a forward search for something ahead
8817 ;; of the indentation line here. That's not good since
8818 ;; the user might not have typed it yet. Unfortunately
8819 ;; it's exceedingly tricky to recognize a function
8820 ;; prototype in a code block without resorting to this.
8821 (c-forward-syntactic-ws)
8822 (eq (char-after) ?
{))
8823 (not (c-at-statement-start-p))
8824 (eq (c-beginning-of-statement-1 containing-sexp nil nil t
)
8827 (let ((c-recognize-typeless-decls nil
))
8828 ;; Turn off recognition of constructs that lacks a
8829 ;; type in this case, since that's more likely to be
8830 ;; a macro followed by a block.
8831 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
8832 (c-add-stmt-syntax 'func-decl-cont nil t
8833 containing-sexp paren-state
))
8835 ;;CASE F: continued statement and the only preceding items are
8837 ((and (c-major-mode-is 'java-mode
)
8838 (setq placeholder
(point))
8839 (c-beginning-of-statement-1)
8841 (while (and (c-forward-annotation)
8842 (< (point) placeholder
))
8843 (c-forward-syntactic-ws))
8846 (>= (point) placeholder
)
8847 (goto-char placeholder
)))
8848 (c-beginning-of-statement-1 containing-sexp
)
8849 (c-add-syntax 'annotation-var-cont
(point)))
8851 ;; CASE G: a template list continuation?
8852 ;; Mostly a duplication of case 5D.3 to fix templates-19:
8853 ((and (c-major-mode-is 'c
++-mode
)
8855 (goto-char indent-point
)
8856 (c-with-syntax-table c
++-template-syntax-table
8857 (setq placeholder
(c-up-list-backward)))
8859 (eq (char-after placeholder
) ?
<)
8860 (/= (char-before placeholder
) ?
<)
8862 (goto-char (1+ placeholder
))
8863 (not (looking-at c-
<-op-cont-regexp
))))))
8864 (c-with-syntax-table c
++-template-syntax-table
8865 (goto-char placeholder
)
8866 (c-beginning-of-statement-1 containing-sexp t
)
8868 (c-backward-syntactic-ws containing-sexp
)
8869 (eq (char-before) ?
<))
8870 ;; In a nested template arglist.
8872 (goto-char placeholder
)
8873 (c-syntactic-skip-backward "^,;" containing-sexp t
)
8874 (c-forward-syntactic-ws))
8875 (back-to-indentation)))
8876 ;; FIXME: Should use c-add-stmt-syntax, but it's not yet
8878 (c-add-syntax 'template-args-cont
(point) placeholder
))
8880 ;; CASE D: continued statement.
8882 (c-beginning-of-statement-1 containing-sexp
)
8883 (c-add-stmt-syntax 'statement-cont nil nil
8884 containing-sexp paren-state
))
8887 ;; The next autoload was added by RMS on 2005/8/9 - don't know why (ACM,
8890 (defun c-guess-basic-syntax ()
8891 "Return the syntactic context of the current line."
8894 (c-save-buffer-state
8895 ((indent-point (point))
8896 (case-fold-search nil
)
8897 ;; A whole ugly bunch of various temporary variables. Have
8898 ;; to declare them here since it's not possible to declare
8899 ;; a variable with only the scope of a cond test and the
8900 ;; following result clauses, and most of this function is a
8901 ;; single gigantic cond. :P
8902 literal char-before-ip before-ws-ip char-after-ip macro-start
8903 in-macro-expr c-syntactic-context placeholder c-in-literal-cache
8904 step-type tmpsymbol keyword injava-inher special-brace-list tmp-pos
8906 ;; The following record some positions for the containing
8907 ;; declaration block if we're directly within one:
8908 ;; `containing-decl-open' is the position of the open
8909 ;; brace. `containing-decl-start' is the start of the
8910 ;; declaration. `containing-decl-kwd' is the keyword
8911 ;; symbol of the keyword that tells what kind of block it
8913 containing-decl-open
8914 containing-decl-start
8916 ;; The open paren of the closest surrounding sexp or nil if
8919 ;; The position after the closest preceding brace sexp
8920 ;; (nested sexps are ignored), or the position after
8921 ;; `containing-sexp' if there is none, or (point-min) if
8922 ;; `containing-sexp' is nil.
8924 ;; The paren state outside `containing-sexp', or at
8925 ;; `indent-point' if `containing-sexp' is nil.
8926 (paren-state (c-parse-state))
8927 ;; There's always at most one syntactic element which got
8928 ;; an anchor pos. It's stored in syntactic-relpos.
8930 (c-stmt-delim-chars c-stmt-delim-chars
))
8932 ;; Check if we're directly inside an enclosing declaration
8934 (when (and (setq containing-sexp
8935 (c-most-enclosing-brace paren-state
))
8937 (goto-char containing-sexp
)
8938 (eq (char-after) ?
{))
8940 (c-looking-at-decl-block
8941 (c-most-enclosing-brace paren-state
8944 (setq containing-decl-open containing-sexp
8945 containing-decl-start
(point)
8946 containing-sexp nil
)
8947 (goto-char placeholder
)
8948 (setq containing-decl-kwd
(and (looking-at c-keywords-regexp
)
8949 (c-keyword-sym (match-string 1)))))
8951 ;; Init some position variables.
8954 (setq containing-sexp
(car paren-state
)
8955 paren-state
(cdr paren-state
))
8956 (if (consp containing-sexp
)
8958 (setq lim
(cdr containing-sexp
))
8959 (if (cdr c-state-cache
)
8960 ;; Ignore balanced paren. The next entry
8961 ;; can't be another one.
8962 (setq containing-sexp
(car (cdr c-state-cache
))
8963 paren-state
(cdr paren-state
))
8964 ;; If there is no surrounding open paren then
8965 ;; put the last balanced pair back on paren-state.
8966 (setq paren-state
(cons containing-sexp paren-state
)
8967 containing-sexp nil
)))
8968 (setq lim
(1+ containing-sexp
))))
8969 (setq lim
(point-min)))
8971 ;; If we're in a parenthesis list then ',' delimits the
8972 ;; "statements" rather than being an operator (with the
8973 ;; exception of the "for" clause). This difference is
8974 ;; typically only noticeable when statements are used in macro
8976 (when (and containing-sexp
8977 (eq (char-after containing-sexp
) ?\
())
8978 (setq c-stmt-delim-chars c-stmt-delim-chars-with-comma
))
8979 ;; cache char before and after indent point, and move point to
8980 ;; the most likely position to perform the majority of tests
8981 (goto-char indent-point
)
8982 (c-backward-syntactic-ws lim
)
8983 (setq before-ws-ip
(point)
8984 char-before-ip
(char-before))
8985 (goto-char indent-point
)
8986 (skip-chars-forward " \t")
8987 (setq char-after-ip
(char-after))
8989 ;; are we in a literal?
8990 (setq literal
(c-in-literal lim
))
8992 ;; now figure out syntactic qualities of the current line
8995 ;; CASE 1: in a string.
8996 ((eq literal
'string
)
8997 (c-add-syntax 'string
(c-point 'bopl
)))
8999 ;; CASE 2: in a C or C++ style comment.
9000 ((and (memq literal
'(c c
++))
9001 ;; This is a kludge for XEmacs where we use
9002 ;; `buffer-syntactic-context', which doesn't correctly
9003 ;; recognize "\*/" to end a block comment.
9004 ;; `parse-partial-sexp' which is used by
9005 ;; `c-literal-limits' will however do that in most
9006 ;; versions, which results in that we get nil from
9007 ;; `c-literal-limits' even when `c-in-literal' claims
9008 ;; we're inside a comment.
9009 (setq placeholder
(c-literal-limits lim
)))
9010 (c-add-syntax literal
(car placeholder
)))
9012 ;; CASE 3: in a cpp preprocessor macro continuation.
9013 ((and (save-excursion
9014 (when (c-beginning-of-macro)
9015 (setq macro-start
(point))))
9016 (/= macro-start
(c-point 'boi
))
9018 (setq tmpsymbol
'cpp-macro-cont
)
9019 (or (not c-syntactic-indentation-in-macros
)
9021 (goto-char macro-start
)
9022 ;; If at the beginning of the body of a #define
9023 ;; directive then analyze as cpp-define-intro
9024 ;; only. Go on with the syntactic analysis
9025 ;; otherwise. in-macro-expr is set if we're in a
9026 ;; cpp expression, i.e. before the #define body
9027 ;; or anywhere in a non-#define directive.
9028 (if (c-forward-to-cpp-define-body)
9029 (let ((indent-boi (c-point 'boi indent-point
)))
9030 (setq in-macro-expr
(> (point) indent-boi
)
9031 tmpsymbol
'cpp-define-intro
)
9032 (= (point) indent-boi
))
9033 (setq in-macro-expr t
)
9035 (c-add-syntax tmpsymbol macro-start
)
9036 (setq macro-start nil
))
9038 ;; CASE 11: an else clause?
9039 ((looking-at "else\\>[^_]")
9040 (c-beginning-of-statement-1 containing-sexp
)
9041 (c-add-stmt-syntax 'else-clause nil t
9042 containing-sexp paren-state
))
9044 ;; CASE 12: while closure of a do/while construct?
9045 ((and (looking-at "while\\>[^_]")
9047 (prog1 (eq (c-beginning-of-statement-1 containing-sexp
)
9049 (setq placeholder
(point)))))
9050 (goto-char placeholder
)
9051 (c-add-stmt-syntax 'do-while-closure nil t
9052 containing-sexp paren-state
))
9054 ;; CASE 13: A catch or finally clause? This case is simpler
9055 ;; than if-else and do-while, because a block is required
9056 ;; after every try, catch and finally.
9058 (and (cond ((c-major-mode-is 'c
++-mode
)
9059 (looking-at "catch\\>[^_]"))
9060 ((c-major-mode-is 'java-mode
)
9061 (looking-at "\\(catch\\|finally\\)\\>[^_]")))
9062 (and (c-safe (c-backward-syntactic-ws)
9065 (eq (char-after) ?
{)
9066 (c-safe (c-backward-syntactic-ws)
9069 (if (eq (char-after) ?\
()
9070 (c-safe (c-backward-sexp) t
)
9072 (looking-at "\\(try\\|catch\\)\\>[^_]")
9073 (setq placeholder
(point))))
9074 (goto-char placeholder
)
9075 (c-add-stmt-syntax 'catch-clause nil t
9076 containing-sexp paren-state
))
9078 ;; CASE 18: A substatement we can recognize by keyword.
9080 (and c-opt-block-stmt-key
9081 (not (eq char-before-ip ?\
;))
9082 (not (c-at-vsemi-p before-ws-ip
))
9083 (not (memq char-after-ip
'(?\
) ?\
] ?
,)))
9084 (or (not (eq char-before-ip ?
}))
9085 (c-looking-at-inexpr-block-backward c-state-cache
))
9088 ;; Ought to cache the result from the
9089 ;; c-beginning-of-statement-1 calls here.
9090 (setq placeholder
(point))
9091 (while (eq (setq step-type
9092 (c-beginning-of-statement-1 lim
))
9094 (if (eq step-type
'previous
)
9095 (goto-char placeholder
)
9096 (setq placeholder
(point))
9097 (if (and (eq step-type
'same
)
9098 (not (looking-at c-opt-block-stmt-key
)))
9099 ;; Step up to the containing statement if we
9100 ;; stayed in the same one.
9104 (c-beginning-of-statement-1 lim
))
9107 (setq placeholder
(point))
9108 ;; There was no containing statement after all.
9109 (goto-char placeholder
)))))
9111 (if (looking-at c-block-stmt-2-key
)
9112 ;; Require a parenthesis after these keywords.
9113 ;; Necessary to catch e.g. synchronized in Java,
9114 ;; which can be used both as statement and
9116 (and (zerop (c-forward-token-2 1 nil
))
9117 (eq (char-after) ?\
())
9118 (looking-at c-opt-block-stmt-key
))))
9120 (if (eq step-type
'up
)
9121 ;; CASE 18A: Simple substatement.
9123 (goto-char placeholder
)
9125 ((eq char-after-ip ?
{)
9126 (c-add-stmt-syntax 'substatement-open nil nil
9127 containing-sexp paren-state
))
9129 (goto-char indent-point
)
9130 (back-to-indentation)
9132 (c-add-stmt-syntax 'substatement-label nil nil
9133 containing-sexp paren-state
))
9135 (c-add-stmt-syntax 'substatement nil nil
9136 containing-sexp paren-state
))))
9138 ;; CASE 18B: Some other substatement. This is shared
9140 (c-guess-continued-construct indent-point
9146 ;; CASE 14: A case or default label
9147 ((looking-at c-label-kwds-regexp
)
9150 (goto-char containing-sexp
)
9151 (setq lim
(c-most-enclosing-brace c-state-cache
9153 (c-backward-to-block-anchor lim
)
9154 (c-add-stmt-syntax 'case-label nil t lim paren-state
))
9155 ;; Got a bogus label at the top level. In lack of better
9156 ;; alternatives, anchor it on (point-min).
9157 (c-add-syntax 'case-label
(point-min))))
9159 ;; CASE 15: any other label
9161 (back-to-indentation)
9162 (and (not (looking-at c-syntactic-ws-start
))
9164 (cond (containing-decl-open
9165 (setq placeholder
(c-add-class-syntax 'inclass
9166 containing-decl-open
9167 containing-decl-start
9170 ;; Append access-label with the same anchor point as
9172 (c-append-syntax 'access-label placeholder
))
9175 (goto-char containing-sexp
)
9176 (setq lim
(c-most-enclosing-brace c-state-cache
9180 (if (and (eq (c-beginning-of-statement-1 lim
) 'up
)
9181 (looking-at "switch\\>[^_]"))
9182 ;; If the surrounding statement is a switch then
9183 ;; let's analyze all labels as switch labels, so
9184 ;; that they get lined up consistently.
9187 (c-backward-to-block-anchor lim
)
9188 (c-add-stmt-syntax tmpsymbol nil t lim paren-state
))
9191 ;; A label on the top level. Treat it as a class
9192 ;; context. (point-min) is the closest we get to the
9193 ;; class open brace.
9194 (c-add-syntax 'access-label
(point-min)))))
9196 ;; CASE 4: In-expression statement. C.f. cases 7B, 16A and
9198 ((setq placeholder
(c-looking-at-inexpr-block
9199 (c-safe-position containing-sexp paren-state
)
9201 ;; Have to turn on the heuristics after
9202 ;; the point even though it doesn't work
9203 ;; very well. C.f. test case class-16.pike.
9205 (setq tmpsymbol
(assq (car placeholder
)
9206 '((inexpr-class . class-open
)
9207 (inexpr-statement . block-open
))))
9209 ;; It's a statement block or an anonymous class.
9210 (setq tmpsymbol
(cdr tmpsymbol
))
9211 ;; It's a Pike lambda. Check whether we are between the
9212 ;; lambda keyword and the argument list or at the defun
9214 (setq tmpsymbol
(if (eq char-after-ip ?
{)
9216 'lambda-intro-cont
)))
9217 (goto-char (cdr placeholder
))
9218 (back-to-indentation)
9219 (c-add-stmt-syntax tmpsymbol nil t
9220 (c-most-enclosing-brace c-state-cache
(point))
9222 (unless (eq (point) (cdr placeholder
))
9223 (c-add-syntax (car placeholder
))))
9225 ;; CASE 5: Line is inside a declaration level block or at top level.
9226 ((or containing-decl-open
(null containing-sexp
))
9229 ;; CASE 5A: we are looking at a defun, brace list, class,
9230 ;; or inline-inclass method opening brace
9231 ((setq special-brace-list
9232 (or (and c-special-brace-lists
9233 (c-looking-at-special-brace-list))
9234 (eq char-after-ip ?
{)))
9237 ;; CASE 5A.1: Non-class declaration block open.
9240 (and (eq char-after-ip ?
{)
9241 (setq tmp
(c-looking-at-decl-block containing-sexp t
))
9243 (setq placeholder
(point))
9245 (looking-at c-symbol-key
))
9247 (c-keyword-sym (setq keyword
(match-string 0)))
9248 'c-other-block-decl-kwds
))))
9249 (goto-char placeholder
)
9251 (if (string-equal keyword
"extern")
9252 ;; Special case for extern-lang-open.
9254 (intern (concat keyword
"-open")))
9255 nil t containing-sexp paren-state
))
9257 ;; CASE 5A.2: we are looking at a class opening brace
9259 (goto-char indent-point
)
9260 (skip-chars-forward " \t")
9261 (and (eq (char-after) ?
{)
9262 (c-looking-at-decl-block containing-sexp t
)
9263 (setq placeholder
(point))))
9264 (c-add-syntax 'class-open placeholder
))
9266 ;; CASE 5A.3: brace list open
9268 (c-beginning-of-decl-1 lim
)
9269 (while (looking-at c-specifier-key
)
9270 (goto-char (match-end 1))
9271 (c-forward-syntactic-ws indent-point
))
9272 (setq placeholder
(c-point 'boi
))
9273 (or (consp special-brace-list
)
9274 (and (or (save-excursion
9275 (goto-char indent-point
)
9276 (setq tmpsymbol nil
)
9277 (while (and (> (point) placeholder
)
9278 (zerop (c-backward-token-2 1 t
))
9279 (/= (char-after) ?
=))
9280 (and c-opt-inexpr-brace-list-key
9282 (looking-at c-opt-inexpr-brace-list-key
)
9283 (setq tmpsymbol
'topmost-intro-cont
)))
9284 (eq (char-after) ?
=))
9285 (looking-at c-brace-list-key
))
9287 (while (and (< (point) indent-point
)
9288 (zerop (c-forward-token-2 1 t
))
9289 (not (memq (char-after) '(?\
; ?\()))))
9290 (not (memq (char-after) '(?\
; ?\()))
9292 (if (and (not c-auto-newline-analysis
)
9293 (c-major-mode-is 'java-mode
)
9294 (eq tmpsymbol
'topmost-intro-cont
))
9295 ;; We're in Java and have found that the open brace
9296 ;; belongs to a "new Foo[]" initialization list,
9297 ;; which means the brace list is part of an
9298 ;; expression and not a top level definition. We
9299 ;; therefore treat it as any topmost continuation
9300 ;; even though the semantically correct symbol still
9301 ;; is brace-list-open, on the same grounds as in
9304 (c-beginning-of-statement-1 lim
)
9305 (c-add-syntax 'topmost-intro-cont
(c-point 'boi
)))
9306 (c-add-syntax 'brace-list-open placeholder
)))
9308 ;; CASE 5A.4: inline defun open
9309 ((and containing-decl-open
9310 (not (c-keyword-member containing-decl-kwd
9311 'c-other-block-decl-kwds
)))
9312 (c-add-syntax 'inline-open
)
9313 (c-add-class-syntax 'inclass
9314 containing-decl-open
9315 containing-decl-start
9319 ;; CASE 5A.5: ordinary defun open
9322 (c-beginning-of-decl-1 lim
)
9323 (while (looking-at c-specifier-key
)
9324 (goto-char (match-end 1))
9325 (c-forward-syntactic-ws indent-point
))
9326 (c-add-syntax 'defun-open
(c-point 'boi
))
9327 ;; Bogus to use bol here, but it's the legacy. (Resolved,
9331 ;; CASE 5B: After a function header but before the body (or
9332 ;; the ending semicolon if there's no body).
9334 (when (setq placeholder
(c-just-after-func-arglist-p lim
))
9335 (setq tmp-pos
(point))))
9338 ;; CASE 5B.1: Member init list.
9339 ((eq (char-after tmp-pos
) ?
:)
9340 (if (or (> tmp-pos indent-point
)
9341 (= (c-point 'bosws
) (1+ tmp-pos
)))
9343 ;; There is no preceding member init clause.
9344 ;; Indent relative to the beginning of indentation
9345 ;; for the topmost-intro line that contains the
9346 ;; prototype's open paren.
9347 (goto-char placeholder
)
9348 (c-add-syntax 'member-init-intro
(c-point 'boi
)))
9349 ;; Indent relative to the first member init clause.
9350 (goto-char (1+ tmp-pos
))
9351 (c-forward-syntactic-ws)
9352 (c-add-syntax 'member-init-cont
(point))))
9354 ;; CASE 5B.2: K&R arg decl intro
9355 ((and c-recognize-knr-p
9356 (c-in-knr-argdecl lim
))
9357 (c-beginning-of-statement-1 lim
)
9358 (c-add-syntax 'knr-argdecl-intro
(c-point 'boi
))
9359 (if containing-decl-open
9360 (c-add-class-syntax 'inclass
9361 containing-decl-open
9362 containing-decl-start
9366 ;; CASE 5B.4: Nether region after a C++ or Java func
9367 ;; decl, which could include a `throws' declaration.
9369 (c-beginning-of-statement-1 lim
)
9370 (c-add-syntax 'func-decl-cont
(c-point 'boi
))
9373 ;; CASE 5C: inheritance line. could be first inheritance
9374 ;; line, or continuation of a multiple inheritance
9375 ((or (and (c-major-mode-is 'c
++-mode
)
9377 (when (eq char-after-ip ?
,)
9378 (skip-chars-forward " \t")
9380 (looking-at c-opt-postfix-decl-spec-key
)))
9381 (and (or (eq char-before-ip ?
:)
9382 ;; watch out for scope operator
9384 (and (eq char-after-ip ?
:)
9385 (c-safe (forward-char 1) t
)
9386 (not (eq (char-after) ?
:))
9389 (c-backward-syntactic-ws lim
)
9390 (if (eq char-before-ip ?
:)
9393 (c-backward-syntactic-ws lim
)))
9394 (back-to-indentation)
9395 (looking-at c-class-key
)))
9397 (and (c-major-mode-is 'java-mode
)
9398 (let ((fence (save-excursion
9399 (c-beginning-of-statement-1 lim
)
9404 (cond ((looking-at c-opt-postfix-decl-spec-key
)
9405 (setq injava-inher
(cons cont
(point))
9407 ((or (not (c-safe (c-forward-sexp -
1) t
))
9413 (not (c-crosses-statement-barrier-p (cdr injava-inher
)
9418 ;; CASE 5C.1: non-hanging colon on an inher intro
9419 ((eq char-after-ip ?
:)
9420 (c-beginning-of-statement-1 lim
)
9421 (c-add-syntax 'inher-intro
(c-point 'boi
))
9422 ;; don't add inclass symbol since relative point already
9423 ;; contains any class offset
9426 ;; CASE 5C.2: hanging colon on an inher intro
9427 ((eq char-before-ip ?
:)
9428 (c-beginning-of-statement-1 lim
)
9429 (c-add-syntax 'inher-intro
(c-point 'boi
))
9430 (if containing-decl-open
9431 (c-add-class-syntax 'inclass
9432 containing-decl-open
9433 containing-decl-start
9437 ;; CASE 5C.3: in a Java implements/extends
9439 (let ((where (cdr injava-inher
))
9440 (cont (car injava-inher
)))
9442 (cond ((looking-at "throws\\>[^_]")
9443 (c-add-syntax 'func-decl-cont
9444 (progn (c-beginning-of-statement-1 lim
)
9446 (cont (c-add-syntax 'inher-cont where
))
9447 (t (c-add-syntax 'inher-intro
9448 (progn (goto-char (cdr injava-inher
))
9449 (c-beginning-of-statement-1 lim
)
9453 ;; CASE 5C.4: a continued inheritance line
9455 (c-beginning-of-inheritance-list lim
)
9456 (c-add-syntax 'inher-cont
(point))
9457 ;; don't add inclass symbol since relative point already
9458 ;; contains any class offset
9461 ;; CASE 5D: this could be a top-level initialization, a
9462 ;; member init list continuation, or a template argument
9463 ;; list continuation.
9465 ;; Note: We use the fact that lim is always after any
9466 ;; preceding brace sexp.
9467 (if c-recognize-
<>-arglists
9470 (c-syntactic-skip-backward "^;,=<>" lim t
)
9473 (when c-overloadable-operators-regexp
9474 (when (setq placeholder
(c-after-special-operator-id lim
))
9475 (goto-char placeholder
)
9478 ((eq (char-before) ?
>)
9479 (or (c-backward-<>-arglist nil lim
)
9482 ((eq (char-before) ?
<)
9485 (c-forward-<>-arglist nil
))
9486 (progn (forward-char)
9490 ;; NB: No c-after-special-operator-id stuff in this
9491 ;; clause - we assume only C++ needs it.
9492 (c-syntactic-skip-backward "^;,=" lim t
))
9493 (memq (char-before) '(?
, ?
= ?
<)))
9496 ;; CASE 5D.3: perhaps a template list continuation?
9497 ((and (c-major-mode-is 'c
++-mode
)
9500 (c-with-syntax-table c
++-template-syntax-table
9501 (goto-char indent-point
)
9502 (setq placeholder
(c-up-list-backward))
9504 (eq (char-after placeholder
) ?
<))))))
9505 (c-with-syntax-table c
++-template-syntax-table
9506 (goto-char placeholder
)
9507 (c-beginning-of-statement-1 lim t
)
9509 (c-backward-syntactic-ws lim
)
9510 (eq (char-before) ?
<))
9511 ;; In a nested template arglist.
9513 (goto-char placeholder
)
9514 (c-syntactic-skip-backward "^,;" lim t
)
9515 (c-forward-syntactic-ws))
9516 (back-to-indentation)))
9517 ;; FIXME: Should use c-add-stmt-syntax, but it's not yet
9519 (c-add-syntax 'template-args-cont
(point) placeholder
))
9521 ;; CASE 5D.4: perhaps a multiple inheritance line?
9522 ((and (c-major-mode-is 'c
++-mode
)
9524 (c-beginning-of-statement-1 lim
)
9525 (setq placeholder
(point))
9526 (if (looking-at "static\\>[^_]")
9527 (c-forward-token-2 1 nil indent-point
))
9528 (and (looking-at c-class-key
)
9529 (zerop (c-forward-token-2 2 nil indent-point
))
9530 (if (eq (char-after) ?
<)
9531 (c-with-syntax-table c
++-template-syntax-table
9532 (zerop (c-forward-token-2 1 t indent-point
)))
9534 (eq (char-after) ?
:))))
9535 (goto-char placeholder
)
9536 (c-add-syntax 'inher-cont
(c-point 'boi
)))
9538 ;; CASE 5D.5: Continuation of the "expression part" of a
9539 ;; top level construct. Or, perhaps, an unrecognized construct.
9541 (while (and (setq placeholder
(point))
9542 (eq (car (c-beginning-of-decl-1 containing-sexp
))
9545 (c-backward-syntactic-ws)
9546 (eq (char-before) ?
}))
9547 (< (point) placeholder
)))
9550 ((eq (point) placeholder
) 'statement
) ; unrecognized construct
9551 ;; A preceding comma at the top level means that a
9552 ;; new variable declaration starts here. Use
9553 ;; topmost-intro-cont for it, for consistency with
9554 ;; the first variable declaration. C.f. case 5N.
9555 ((eq char-before-ip ?
,) 'topmost-intro-cont
)
9556 (t 'statement-cont
))
9557 nil nil containing-sexp paren-state
))
9560 ;; CASE 5F: Close of a non-class declaration level block.
9561 ((and (eq char-after-ip ?
})
9562 (c-keyword-member containing-decl-kwd
9563 'c-other-block-decl-kwds
))
9564 ;; This is inconsistent: Should use `containing-decl-open'
9565 ;; here if it's at boi, like in case 5J.
9566 (goto-char containing-decl-start
)
9568 (if (string-equal (symbol-name containing-decl-kwd
) "extern")
9569 ;; Special case for compatibility with the
9570 ;; extern-lang syntactic symbols.
9572 (intern (concat (symbol-name containing-decl-kwd
)
9575 (c-most-enclosing-brace paren-state
(point))
9578 ;; CASE 5G: we are looking at the brace which closes the
9579 ;; enclosing nested class decl
9580 ((and containing-sexp
9581 (eq char-after-ip ?
})
9582 (eq containing-decl-open containing-sexp
))
9583 (c-add-class-syntax 'class-close
9584 containing-decl-open
9585 containing-decl-start
9589 ;; CASE 5H: we could be looking at subsequent knr-argdecls
9590 ((and c-recognize-knr-p
9591 (not containing-sexp
) ; can't be knr inside braces.
9592 (not (eq char-before-ip ?
}))
9594 (setq placeholder
(cdr (c-beginning-of-decl-1 lim
)))
9596 ;; Do an extra check to avoid tripping up on
9597 ;; statements that occur in invalid contexts
9598 ;; (e.g. in macro bodies where we don't really
9599 ;; know the context of what we're looking at).
9600 (not (and c-opt-block-stmt-key
9601 (looking-at c-opt-block-stmt-key
)))))
9602 (< placeholder indent-point
))
9603 (goto-char placeholder
)
9604 (c-add-syntax 'knr-argdecl
(point)))
9606 ;; CASE 5I: ObjC method definition.
9607 ((and c-opt-method-key
9608 (looking-at c-opt-method-key
))
9609 (c-beginning-of-statement-1 nil t
)
9610 (if (= (point) indent-point
)
9611 ;; Handle the case when it's the first (non-comment)
9612 ;; thing in the buffer. Can't look for a 'same return
9613 ;; value from cbos1 since ObjC directives currently
9614 ;; aren't recognized fully, so that we get 'same
9615 ;; instead of 'previous if it moved over a preceding
9617 (goto-char (point-min)))
9618 (c-add-syntax 'objc-method-intro
(c-point 'boi
)))
9620 ;; CASE 5P: AWK pattern or function or continuation
9622 ((c-major-mode-is 'awk-mode
)
9623 (setq placeholder
(point))
9625 (if (and (eq (c-beginning-of-statement-1) 'same
)
9626 (/= (point) placeholder
))
9630 containing-sexp paren-state
))
9632 ;; CASE 5N: At a variable declaration that follows a class
9633 ;; definition or some other block declaration that doesn't
9634 ;; end at the closing '}'. C.f. case 5D.5.
9636 (c-backward-syntactic-ws lim
)
9637 (and (eq (char-before) ?
})
9639 (let ((start (point)))
9640 (if (and c-state-cache
9641 (consp (car c-state-cache
))
9642 (eq (cdar c-state-cache
) (point)))
9643 ;; Speed up the backward search a bit.
9644 (goto-char (caar c-state-cache
)))
9645 (c-beginning-of-decl-1 containing-sexp
)
9646 (setq placeholder
(point))
9647 (if (= start
(point))
9648 ;; The '}' is unbalanced.
9651 (>= (point) indent-point
))))))
9652 (goto-char placeholder
)
9653 (c-add-stmt-syntax 'topmost-intro-cont nil nil
9654 containing-sexp paren-state
))
9656 ;; NOTE: The point is at the end of the previous token here.
9658 ;; CASE 5J: we are at the topmost level, make
9659 ;; sure we skip back past any access specifiers
9661 ;; A macro continuation line is never at top level.
9662 (not (and macro-start
9663 (> indent-point macro-start
)))
9665 (setq placeholder
(point))
9666 (or (memq char-before-ip
'(?\
; ?{ ?} nil))
9667 (c-at-vsemi-p before-ws-ip
)
9668 (when (and (eq char-before-ip ?
:)
9669 (eq (c-beginning-of-statement-1 lim
)
9671 (c-backward-syntactic-ws lim
)
9672 (setq placeholder
(point)))
9673 (and (c-major-mode-is 'objc-mode
)
9674 (catch 'not-in-directive
9675 (c-beginning-of-statement-1 lim
)
9676 (setq placeholder
(point))
9677 (while (and (c-forward-objc-directive)
9678 (< (point) indent-point
))
9679 (c-forward-syntactic-ws)
9680 (if (>= (point) indent-point
)
9681 (throw 'not-in-directive t
))
9682 (setq placeholder
(point)))
9684 ;; For historic reasons we anchor at bol of the last
9685 ;; line of the previous declaration. That's clearly
9686 ;; highly bogus and useless, and it makes our lives hard
9687 ;; to remain compatible. :P
9688 (goto-char placeholder
)
9689 (c-add-syntax 'topmost-intro
(c-point 'bol
))
9690 (if containing-decl-open
9691 (if (c-keyword-member containing-decl-kwd
9692 'c-other-block-decl-kwds
)
9694 (goto-char (c-brace-anchor-point containing-decl-open
))
9696 (if (string-equal (symbol-name containing-decl-kwd
)
9698 ;; Special case for compatibility with the
9699 ;; extern-lang syntactic symbols.
9701 (intern (concat "in"
9702 (symbol-name containing-decl-kwd
))))
9704 (c-most-enclosing-brace paren-state
(point))
9706 (c-add-class-syntax 'inclass
9707 containing-decl-open
9708 containing-decl-start
9711 (when (and c-syntactic-indentation-in-macros
9713 (/= macro-start
(c-point 'boi indent-point
)))
9714 (c-add-syntax 'cpp-define-intro
)
9715 (setq macro-start nil
)))
9717 ;; CASE 5K: we are at an ObjC method definition
9718 ;; continuation line.
9719 ((and c-opt-method-key
9721 (c-beginning-of-statement-1 lim
)
9723 (when (looking-at c-opt-method-key
)
9724 (setq placeholder
(point)))))
9725 (c-add-syntax 'objc-method-args-cont placeholder
))
9727 ;; CASE 5L: we are at the first argument of a template
9728 ;; arglist that begins on the previous line.
9729 ((and c-recognize-
<>-arglists
9730 (eq (char-before) ?
<)
9731 (not (and c-overloadable-operators-regexp
9732 (c-after-special-operator-id lim
))))
9733 (c-beginning-of-statement-1 (c-safe-position (point) paren-state
))
9734 (c-add-syntax 'template-args-cont
(c-point 'boi
)))
9736 ;; CASE 5Q: we are at a statement within a macro.
9738 (c-beginning-of-statement-1 containing-sexp
)
9739 (c-add-stmt-syntax 'statement nil t containing-sexp paren-state
))
9741 ;;CASE 5N: We are at a topmost continuation line and the only
9742 ;;preceding items are annotations.
9743 ((and (c-major-mode-is 'java-mode
)
9744 (setq placeholder
(point))
9745 (c-beginning-of-statement-1)
9747 (while (and (c-forward-annotation))
9748 (c-forward-syntactic-ws))
9751 (>= (point) placeholder
)
9752 (goto-char placeholder
)))
9753 (c-add-syntax 'annotation-top-cont
(c-point 'boi
)))
9755 ;; CASE 5M: we are at a topmost continuation line
9757 (c-beginning-of-statement-1 (c-safe-position (point) paren-state
))
9758 (when (c-major-mode-is 'objc-mode
)
9759 (setq placeholder
(point))
9760 (while (and (c-forward-objc-directive)
9761 (< (point) indent-point
))
9762 (c-forward-syntactic-ws)
9763 (setq placeholder
(point)))
9764 (goto-char placeholder
))
9765 (c-add-syntax 'topmost-intro-cont
(c-point 'boi
)))
9769 ;; (CASE 6 has been removed.)
9771 ;; CASE 7: line is an expression, not a statement. Most
9772 ;; likely we are either in a function prototype or a function
9773 ;; call argument list
9774 ((not (or (and c-special-brace-lists
9776 (goto-char containing-sexp
)
9777 (c-looking-at-special-brace-list)))
9778 (eq (char-after containing-sexp
) ?
{)))
9781 ;; CASE 7A: we are looking at the arglist closing paren.
9783 ((memq char-after-ip
'(?\
) ?\
]))
9784 (goto-char containing-sexp
)
9785 (setq placeholder
(c-point 'boi
))
9786 (if (and (c-safe (backward-up-list 1) t
)
9787 (>= (point) placeholder
))
9790 (skip-chars-forward " \t"))
9791 (goto-char placeholder
))
9792 (c-add-stmt-syntax 'arglist-close
(list containing-sexp
) t
9793 (c-most-enclosing-brace paren-state
(point))
9796 ;; CASE 7B: Looking at the opening brace of an
9797 ;; in-expression block or brace list. C.f. cases 4, 16A
9799 ((and (eq char-after-ip ?
{)
9801 (setq placeholder
(c-inside-bracelist-p (point)
9804 (setq tmpsymbol
'(brace-list-open . inexpr-class
))
9805 (setq tmpsymbol
'(block-open . inexpr-statement
)
9807 (cdr-safe (c-looking-at-inexpr-block
9808 (c-safe-position containing-sexp
9811 ;; placeholder is nil if it's a block directly in
9812 ;; a function arglist. That makes us skip out of
9815 (goto-char placeholder
)
9816 (back-to-indentation)
9817 (c-add-stmt-syntax (car tmpsymbol
) nil t
9818 (c-most-enclosing-brace paren-state
(point))
9820 (if (/= (point) placeholder
)
9821 (c-add-syntax (cdr tmpsymbol
))))
9823 ;; CASE 7C: we are looking at the first argument in an empty
9824 ;; argument list. Use arglist-close if we're actually
9825 ;; looking at a close paren or bracket.
9826 ((memq char-before-ip
'(?\
( ?\
[))
9827 (goto-char containing-sexp
)
9828 (setq placeholder
(c-point 'boi
))
9829 (if (and (c-safe (backward-up-list 1) t
)
9830 (>= (point) placeholder
))
9833 (skip-chars-forward " \t"))
9834 (goto-char placeholder
))
9835 (c-add-stmt-syntax 'arglist-intro
(list containing-sexp
) t
9836 (c-most-enclosing-brace paren-state
(point))
9839 ;; CASE 7D: we are inside a conditional test clause. treat
9840 ;; these things as statements
9842 (goto-char containing-sexp
)
9843 (and (c-safe (c-forward-sexp -
1) t
)
9844 (looking-at "\\<for\\>[^_]")))
9845 (goto-char (1+ containing-sexp
))
9846 (c-forward-syntactic-ws indent-point
)
9847 (if (eq char-before-ip ?\
;)
9848 (c-add-syntax 'statement
(point))
9849 (c-add-syntax 'statement-cont
(point))
9852 ;; CASE 7E: maybe a continued ObjC method call. This is the
9853 ;; case when we are inside a [] bracketed exp, and what
9854 ;; precede the opening bracket is not an identifier.
9855 ((and c-opt-method-key
9856 (eq (char-after containing-sexp
) ?\
[)
9858 (goto-char (1- containing-sexp
))
9859 (c-backward-syntactic-ws (c-point 'bod
))
9860 (if (not (looking-at c-symbol-key
))
9861 (c-add-syntax 'objc-method-call-cont containing-sexp
))
9864 ;; CASE 7F: we are looking at an arglist continuation line,
9865 ;; but the preceding argument is on the same line as the
9866 ;; opening paren. This case includes multi-line
9867 ;; mathematical paren groupings, but we could be on a
9868 ;; for-list continuation line. C.f. case 7A.
9870 (goto-char (1+ containing-sexp
))
9872 (c-forward-syntactic-ws)
9875 (goto-char containing-sexp
) ; paren opening the arglist
9876 (setq placeholder
(c-point 'boi
))
9877 (if (and (c-safe (backward-up-list 1) t
)
9878 (>= (point) placeholder
))
9881 (skip-chars-forward " \t"))
9882 (goto-char placeholder
))
9883 (c-add-stmt-syntax 'arglist-cont-nonempty
(list containing-sexp
) t
9884 (c-most-enclosing-brace c-state-cache
(point))
9887 ;; CASE 7G: we are looking at just a normal arglist
9888 ;; continuation line
9889 (t (c-forward-syntactic-ws indent-point
)
9890 (c-add-syntax 'arglist-cont
(c-point 'boi
)))
9893 ;; CASE 8: func-local multi-inheritance line
9894 ((and (c-major-mode-is 'c
++-mode
)
9896 (goto-char indent-point
)
9897 (skip-chars-forward " \t")
9898 (looking-at c-opt-postfix-decl-spec-key
)))
9899 (goto-char indent-point
)
9900 (skip-chars-forward " \t")
9903 ;; CASE 8A: non-hanging colon on an inher intro
9904 ((eq char-after-ip ?
:)
9905 (c-backward-syntactic-ws lim
)
9906 (c-add-syntax 'inher-intro
(c-point 'boi
)))
9908 ;; CASE 8B: hanging colon on an inher intro
9909 ((eq char-before-ip ?
:)
9910 (c-add-syntax 'inher-intro
(c-point 'boi
)))
9912 ;; CASE 8C: a continued inheritance line
9914 (c-beginning-of-inheritance-list lim
)
9915 (c-add-syntax 'inher-cont
(point))
9918 ;; CASE 9: we are inside a brace-list
9919 ((and (not (c-major-mode-is 'awk-mode
)) ; Maybe this isn't needed (ACM, 2002/3/29)
9920 (setq special-brace-list
9921 (or (and c-special-brace-lists
;;;; ALWAYS NIL FOR AWK!!
9923 (goto-char containing-sexp
)
9924 (c-looking-at-special-brace-list)))
9925 (c-inside-bracelist-p containing-sexp paren-state
))))
9928 ;; CASE 9A: In the middle of a special brace list opener.
9929 ((and (consp special-brace-list
)
9931 (goto-char containing-sexp
)
9932 (eq (char-after) ?\
())
9933 (eq char-after-ip
(car (cdr special-brace-list
))))
9934 (goto-char (car (car special-brace-list
)))
9935 (skip-chars-backward " \t")
9937 (assoc 'statement-cont
9938 (setq placeholder
(c-guess-basic-syntax))))
9939 (setq c-syntactic-context placeholder
)
9940 (c-beginning-of-statement-1
9941 (c-safe-position (1- containing-sexp
) paren-state
))
9942 (c-forward-token-2 0)
9943 (while (looking-at c-specifier-key
)
9944 (goto-char (match-end 1))
9945 (c-forward-syntactic-ws))
9946 (c-add-syntax 'brace-list-open
(c-point 'boi
))))
9948 ;; CASE 9B: brace-list-close brace
9949 ((if (consp special-brace-list
)
9950 ;; Check special brace list closer.
9952 (goto-char (car (car special-brace-list
)))
9954 (goto-char indent-point
)
9955 (back-to-indentation)
9957 ;; We were between the special close char and the `)'.
9958 (and (eq (char-after) ?\
))
9959 (eq (1+ (point)) (cdr (car special-brace-list
))))
9960 ;; We were before the special close char.
9961 (and (eq (char-after) (cdr (cdr special-brace-list
)))
9962 (zerop (c-forward-token-2))
9963 (eq (1+ (point)) (cdr (car special-brace-list
)))))))
9964 ;; Normal brace list check.
9965 (and (eq char-after-ip ?
})
9966 (c-safe (goto-char (c-up-list-backward (point))) t
)
9967 (= (point) containing-sexp
)))
9968 (if (eq (point) (c-point 'boi
))
9969 (c-add-syntax 'brace-list-close
(point))
9970 (setq lim
(c-most-enclosing-brace c-state-cache
(point)))
9971 (c-beginning-of-statement-1 lim
)
9972 (c-add-stmt-syntax 'brace-list-close nil t lim paren-state
)))
9975 ;; Prepare for the rest of the cases below by going to the
9976 ;; token following the opening brace
9977 (if (consp special-brace-list
)
9979 (goto-char (car (car special-brace-list
)))
9980 (c-forward-token-2 1 nil indent-point
))
9981 (goto-char containing-sexp
))
9983 (let ((start (point)))
9984 (c-forward-syntactic-ws indent-point
)
9985 (goto-char (max start
(c-point 'bol
))))
9986 (c-skip-ws-forward indent-point
)
9989 ;; CASE 9C: we're looking at the first line in a brace-list
9990 ((= (point) indent-point
)
9991 (if (consp special-brace-list
)
9992 (goto-char (car (car special-brace-list
)))
9993 (goto-char containing-sexp
))
9994 (if (eq (point) (c-point 'boi
))
9995 (c-add-syntax 'brace-list-intro
(point))
9996 (setq lim
(c-most-enclosing-brace c-state-cache
(point)))
9997 (c-beginning-of-statement-1 lim
)
9998 (c-add-stmt-syntax 'brace-list-intro nil t lim paren-state
)))
10000 ;; CASE 9D: this is just a later brace-list-entry or
10001 ;; brace-entry-open
10002 (t (if (or (eq char-after-ip ?
{)
10003 (and c-special-brace-lists
10005 (goto-char indent-point
)
10006 (c-forward-syntactic-ws (c-point 'eol
))
10007 (c-looking-at-special-brace-list (point)))))
10008 (c-add-syntax 'brace-entry-open
(point))
10009 (c-add-syntax 'brace-list-entry
(point))
10013 ;; CASE 10: A continued statement or top level construct.
10014 ((and (not (memq char-before-ip
'(?\
; ?:)))
10015 (not (c-at-vsemi-p before-ws-ip
))
10016 (or (not (eq char-before-ip ?
}))
10017 (c-looking-at-inexpr-block-backward c-state-cache
))
10020 (c-beginning-of-statement-1 containing-sexp
)
10021 (setq placeholder
(point))))
10022 (/= placeholder containing-sexp
))
10023 ;; This is shared with case 18.
10024 (c-guess-continued-construct indent-point
10030 ;; CASE 16: block close brace, possibly closing the defun or
10032 ((eq char-after-ip ?
})
10033 ;; From here on we have the next containing sexp in lim.
10034 (setq lim
(c-most-enclosing-brace paren-state
))
10035 (goto-char containing-sexp
)
10038 ;; CASE 16E: Closing a statement block? This catches
10039 ;; cases where it's preceded by a statement keyword,
10040 ;; which works even when used in an "invalid" context,
10041 ;; e.g. a macro argument.
10042 ((c-after-conditional)
10043 (c-backward-to-block-anchor lim
)
10044 (c-add-stmt-syntax 'block-close nil t lim paren-state
))
10046 ;; CASE 16A: closing a lambda defun or an in-expression
10047 ;; block? C.f. cases 4, 7B and 17E.
10048 ((setq placeholder
(c-looking-at-inexpr-block
10049 (c-safe-position containing-sexp paren-state
)
10051 (setq tmpsymbol
(if (eq (car placeholder
) 'inlambda
)
10054 (goto-char containing-sexp
)
10055 (back-to-indentation)
10056 (if (= containing-sexp
(point))
10057 (c-add-syntax tmpsymbol
(point))
10058 (goto-char (cdr placeholder
))
10059 (back-to-indentation)
10060 (c-add-stmt-syntax tmpsymbol nil t
10061 (c-most-enclosing-brace paren-state
(point))
10063 (if (/= (point) (cdr placeholder
))
10064 (c-add-syntax (car placeholder
)))))
10066 ;; CASE 16B: does this close an inline or a function in
10067 ;; a non-class declaration level block?
10072 (c-looking-at-decl-block
10073 (c-most-enclosing-brace paren-state lim
)
10075 (setq placeholder
(point))))
10076 (c-backward-to-decl-anchor lim
)
10077 (back-to-indentation)
10078 (if (save-excursion
10079 (goto-char placeholder
)
10080 (looking-at c-other-decl-block-key
))
10081 (c-add-syntax 'defun-close
(point))
10082 (c-add-syntax 'inline-close
(point))))
10084 ;; CASE 16F: Can be a defun-close of a function declared
10085 ;; in a statement block, e.g. in Pike or when using gcc
10086 ;; extensions, but watch out for macros followed by
10087 ;; blocks. Let it through to be handled below.
10088 ;; C.f. cases B.3 and 17G.
10090 (and (not (c-at-statement-start-p))
10091 (eq (c-beginning-of-statement-1 lim nil nil t
) 'same
)
10092 (setq placeholder
(point))
10093 (let ((c-recognize-typeless-decls nil
))
10094 ;; Turn off recognition of constructs that
10095 ;; lacks a type in this case, since that's more
10096 ;; likely to be a macro followed by a block.
10097 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
10098 (back-to-indentation)
10099 (if (/= (point) containing-sexp
)
10100 (goto-char placeholder
))
10101 (c-add-stmt-syntax 'defun-close nil t lim paren-state
))
10103 ;; CASE 16C: If there is an enclosing brace then this is
10104 ;; a block close since defun closes inside declaration
10105 ;; level blocks have been handled above.
10107 ;; If the block is preceded by a case/switch label on
10108 ;; the same line, we anchor at the first preceding label
10109 ;; at boi. The default handling in c-add-stmt-syntax
10110 ;; really fixes it better, but we do like this to keep
10111 ;; the indentation compatible with version 5.28 and
10112 ;; earlier. C.f. case 17H.
10113 (while (and (/= (setq placeholder
(point)) (c-point 'boi
))
10114 (eq (c-beginning-of-statement-1 lim
) 'label
)))
10115 (goto-char placeholder
)
10116 (if (looking-at c-label-kwds-regexp
)
10117 (c-add-syntax 'block-close
(point))
10118 (goto-char containing-sexp
)
10119 ;; c-backward-to-block-anchor not necessary here; those
10120 ;; situations are handled in case 16E above.
10121 (c-add-stmt-syntax 'block-close nil t lim paren-state
)))
10123 ;; CASE 16D: Only top level defun close left.
10125 (goto-char containing-sexp
)
10126 (c-backward-to-decl-anchor lim
)
10127 (c-add-stmt-syntax 'defun-close nil nil
10128 (c-most-enclosing-brace paren-state
)
10132 ;; CASE 19: line is an expression, not a statement, and is directly
10133 ;; contained by a template delimiter. Most likely, we are in a
10134 ;; template arglist within a statement. This case is based on CASE
10135 ;; 7. At some point in the future, we may wish to create more
10136 ;; syntactic symbols such as `template-intro',
10137 ;; `template-cont-nonempty', etc., and distinguish between them as we
10138 ;; do for `arglist-intro' etc. (2009-12-07).
10139 ((and c-recognize-
<>-arglists
10140 (setq containing-
< (c-up-list-backward indent-point containing-sexp
))
10141 (eq (char-after containing-
<) ?\
<))
10142 (setq placeholder
(c-point 'boi containing-
<))
10143 (goto-char containing-sexp
) ; Most nested Lbrace/Lparen (but not
10144 ; '<') before indent-point.
10145 (if (>= (point) placeholder
)
10148 (skip-chars-forward " \t"))
10149 (goto-char placeholder
))
10150 (c-add-stmt-syntax 'template-args-cont
(list containing-
<) t
10151 (c-most-enclosing-brace c-state-cache
(point))
10154 ;; CASE 17: Statement or defun catchall.
10156 (goto-char indent-point
)
10157 ;; Back up statements until we find one that starts at boi.
10158 (while (let* ((prev-point (point))
10159 (last-step-type (c-beginning-of-statement-1
10161 (if (= (point) prev-point
)
10163 (setq step-type
(or step-type last-step-type
))
10165 (setq step-type last-step-type
)
10166 (/= (point) (c-point 'boi
)))))
10169 ;; CASE 17B: continued statement
10170 ((and (eq step-type
'same
)
10171 (/= (point) indent-point
))
10172 (c-add-stmt-syntax 'statement-cont nil nil
10173 containing-sexp paren-state
))
10175 ;; CASE 17A: After a case/default label?
10177 (while (and (eq step-type
'label
)
10178 (not (looking-at c-label-kwds-regexp
)))
10180 (c-beginning-of-statement-1 containing-sexp
)))
10181 (eq step-type
'label
))
10182 (c-add-stmt-syntax (if (eq char-after-ip ?
{)
10183 'statement-case-open
10184 'statement-case-intro
)
10185 nil t containing-sexp paren-state
))
10187 ;; CASE 17D: any old statement
10189 (while (eq step-type
'label
)
10191 (c-beginning-of-statement-1 containing-sexp
)))
10192 (eq step-type
'previous
))
10193 (c-add-stmt-syntax 'statement nil t
10194 containing-sexp paren-state
)
10195 (if (eq char-after-ip ?
{)
10196 (c-add-syntax 'block-open
)))
10198 ;; CASE 17I: Inside a substatement block.
10200 ;; The following tests are all based on containing-sexp.
10201 (goto-char containing-sexp
)
10202 ;; From here on we have the next containing sexp in lim.
10203 (setq lim
(c-most-enclosing-brace paren-state containing-sexp
))
10204 (c-after-conditional))
10205 (c-backward-to-block-anchor lim
)
10206 (c-add-stmt-syntax 'statement-block-intro nil t
10208 (if (eq char-after-ip ?
{)
10209 (c-add-syntax 'block-open
)))
10211 ;; CASE 17E: first statement in an in-expression block.
10212 ;; C.f. cases 4, 7B and 16A.
10213 ((setq placeholder
(c-looking-at-inexpr-block
10214 (c-safe-position containing-sexp paren-state
)
10216 (setq tmpsymbol
(if (eq (car placeholder
) 'inlambda
)
10218 'statement-block-intro
))
10219 (back-to-indentation)
10220 (if (= containing-sexp
(point))
10221 (c-add-syntax tmpsymbol
(point))
10222 (goto-char (cdr placeholder
))
10223 (back-to-indentation)
10224 (c-add-stmt-syntax tmpsymbol nil t
10225 (c-most-enclosing-brace c-state-cache
(point))
10227 (if (/= (point) (cdr placeholder
))
10228 (c-add-syntax (car placeholder
))))
10229 (if (eq char-after-ip ?
{)
10230 (c-add-syntax 'block-open
)))
10232 ;; CASE 17F: first statement in an inline, or first
10233 ;; statement in a top-level defun. we can tell this is it
10234 ;; if there are no enclosing braces that haven't been
10235 ;; narrowed out by a class (i.e. don't use bod here).
10237 (or (not (setq placeholder
(c-most-enclosing-brace
10240 (goto-char placeholder
)
10241 (eq (char-after) ?
{))
10242 (c-looking-at-decl-block (c-most-enclosing-brace
10243 paren-state
(point))
10245 (c-backward-to-decl-anchor lim
)
10246 (back-to-indentation)
10247 (c-add-syntax 'defun-block-intro
(point)))
10249 ;; CASE 17G: First statement in a function declared inside
10250 ;; a normal block. This can occur in Pike and with
10251 ;; e.g. the gcc extensions, but watch out for macros
10252 ;; followed by blocks. C.f. cases B.3 and 16F.
10254 (and (not (c-at-statement-start-p))
10255 (eq (c-beginning-of-statement-1 lim nil nil t
) 'same
)
10256 (setq placeholder
(point))
10257 (let ((c-recognize-typeless-decls nil
))
10258 ;; Turn off recognition of constructs that lacks
10259 ;; a type in this case, since that's more likely
10260 ;; to be a macro followed by a block.
10261 (c-forward-decl-or-cast-1 (c-point 'bosws
) nil nil
))))
10262 (back-to-indentation)
10263 (if (/= (point) containing-sexp
)
10264 (goto-char placeholder
))
10265 (c-add-stmt-syntax 'defun-block-intro nil t
10268 ;; CASE 17H: First statement in a block.
10270 ;; If the block is preceded by a case/switch label on the
10271 ;; same line, we anchor at the first preceding label at
10272 ;; boi. The default handling in c-add-stmt-syntax is
10273 ;; really fixes it better, but we do like this to keep the
10274 ;; indentation compatible with version 5.28 and earlier.
10276 (while (and (/= (setq placeholder
(point)) (c-point 'boi
))
10277 (eq (c-beginning-of-statement-1 lim
) 'label
)))
10278 (goto-char placeholder
)
10279 (if (looking-at c-label-kwds-regexp
)
10280 (c-add-syntax 'statement-block-intro
(point))
10281 (goto-char containing-sexp
)
10282 ;; c-backward-to-block-anchor not necessary here; those
10283 ;; situations are handled in case 17I above.
10284 (c-add-stmt-syntax 'statement-block-intro nil t
10286 (if (eq char-after-ip ?
{)
10287 (c-add-syntax 'block-open
)))
10291 ;; now we need to look at any modifiers
10292 (goto-char indent-point
)
10293 (skip-chars-forward " \t")
10295 ;; are we looking at a comment only line?
10296 (when (and (looking-at c-comment-start-regexp
)
10297 (/= (c-forward-token-2 0 nil
(c-point 'eol
)) 0))
10298 (c-append-syntax 'comment-intro
))
10300 ;; we might want to give additional offset to friends (in C++).
10301 (when (and c-opt-friend-key
10302 (looking-at c-opt-friend-key
))
10303 (c-append-syntax 'friend
))
10305 ;; Set syntactic-relpos.
10306 (let ((p c-syntactic-context
))
10308 (if (integerp (c-langelem-pos (car p
)))
10310 (setq syntactic-relpos
(c-langelem-pos (car p
)))
10315 ;; Start of or a continuation of a preprocessor directive?
10316 (if (and macro-start
10317 (eq macro-start
(c-point 'boi
))
10318 (not (and (c-major-mode-is 'pike-mode
)
10319 (eq (char-after (1+ macro-start
)) ?
\"))))
10320 (c-append-syntax 'cpp-macro
)
10321 (when (and c-syntactic-indentation-in-macros macro-start
)
10324 (< syntactic-relpos macro-start
)
10326 (assq 'arglist-intro c-syntactic-context
)
10327 (assq 'arglist-cont c-syntactic-context
)
10328 (assq 'arglist-cont-nonempty c-syntactic-context
)
10329 (assq 'arglist-close c-syntactic-context
))))
10330 ;; If inside a cpp expression, i.e. anywhere in a
10331 ;; cpp directive except a #define body, we only let
10332 ;; through the syntactic analysis that is internal
10333 ;; in the expression. That means the arglist
10334 ;; elements, if they are anchored inside the cpp
10336 (setq c-syntactic-context nil
)
10337 (c-add-syntax 'cpp-macro-cont macro-start
))
10338 (when (and (eq macro-start syntactic-relpos
)
10339 (not (assq 'cpp-define-intro c-syntactic-context
))
10341 (goto-char macro-start
)
10342 (or (not (c-forward-to-cpp-define-body))
10343 (<= (point) (c-point 'boi indent-point
)))))
10344 ;; Inside a #define body and the syntactic analysis is
10345 ;; anchored on the start of the #define. In this case
10346 ;; we add cpp-define-intro to get the extra
10347 ;; indentation of the #define body.
10348 (c-add-syntax 'cpp-define-intro
)))))
10350 ;; return the syntax
10351 c-syntactic-context
)))
10354 ;; Indentation calculation.
10356 (defun c-evaluate-offset (offset langelem symbol
)
10357 ;; offset can be a number, a function, a variable, a list, or one of
10358 ;; the symbols + or -
10360 ;; This function might do hidden buffer changes.
10363 ((numberp offset
) offset
)
10364 ((vectorp offset
) offset
)
10365 ((null offset
) nil
)
10367 ((eq offset
'+) c-basic-offset
)
10368 ((eq offset
'-
) (- c-basic-offset
))
10369 ((eq offset
'++) (* 2 c-basic-offset
))
10370 ((eq offset
'--
) (* 2 (- c-basic-offset
)))
10371 ((eq offset
'*) (/ c-basic-offset
2))
10372 ((eq offset
'/) (/ (- c-basic-offset
) 2))
10374 ((functionp offset
)
10377 (cons (c-langelem-sym langelem
)
10378 (c-langelem-pos langelem
)))
10383 ((eq (car offset
) 'quote
)
10384 (c-benign-error "The offset %S for %s was mistakenly quoted"
10388 ((memq (car offset
) '(min max
))
10389 (let (res val
(method (car offset
)))
10390 (setq offset
(cdr offset
))
10392 (setq val
(c-evaluate-offset (car offset
) langelem symbol
))
10400 Error evaluating offset %S for %s: \
10401 Cannot combine absolute offset %S with relative %S in `%s' method"
10402 (car offset
) symbol res val method
)
10403 (setq res
(funcall method res val
))))
10407 Error evaluating offset %S for %s: \
10408 Cannot combine relative offset %S with absolute %S in `%s' method"
10409 (car offset
) symbol res val method
)
10410 (setq res
(vector (funcall method
(aref res
0)
10412 (setq offset
(cdr offset
)))
10415 ((eq (car offset
) 'add
)
10417 (setq offset
(cdr offset
))
10419 (setq val
(c-evaluate-offset (car offset
) langelem symbol
))
10426 (setq res
(vector (+ (aref res
0) val
)))
10427 (setq res
(+ res val
))))
10431 Error evaluating offset %S for %s: \
10432 Cannot combine absolute offsets %S and %S in `add' method"
10433 (car offset
) symbol res val
)
10434 (setq res val
)))) ; Override.
10435 (setq offset
(cdr offset
)))
10440 (when (eq (car offset
) 'first
)
10441 (setq offset
(cdr offset
)))
10442 (while (and (not res
) offset
)
10443 (setq res
(c-evaluate-offset (car offset
) langelem symbol
)
10444 offset
(cdr offset
)))
10447 ((and (symbolp offset
) (boundp offset
))
10448 (symbol-value offset
))
10451 (c-benign-error "Unknown offset format %S for %s" offset symbol
)
10454 (if (or (null res
) (integerp res
)
10455 (and (vectorp res
) (= (length res
) 1) (integerp (aref res
0))))
10457 (c-benign-error "Error evaluating offset %S for %s: Got invalid value %S"
10461 (defun c-calc-offset (langelem)
10462 ;; Get offset from LANGELEM which is a list beginning with the
10463 ;; syntactic symbol and followed by any analysis data it provides.
10464 ;; That data may be zero or more elements, but if at least one is
10465 ;; given then the first is the anchor position (or nil). The symbol
10466 ;; is matched against `c-offsets-alist' and the offset calculated
10467 ;; from that is returned.
10469 ;; This function might do hidden buffer changes.
10470 (let* ((symbol (c-langelem-sym langelem
))
10471 (match (assq symbol c-offsets-alist
))
10472 (offset (cdr-safe match
)))
10474 (setq offset
(c-evaluate-offset offset langelem symbol
))
10475 (if c-strict-syntax-p
10476 (c-benign-error "No offset found for syntactic symbol %s" symbol
))
10478 (if (vectorp offset
)
10480 (or (and (numberp offset
) offset
)
10481 (and (symbolp offset
) (symbol-value offset
))
10485 (defun c-get-offset (langelem)
10486 ;; This is a compatibility wrapper for `c-calc-offset' in case
10487 ;; someone is calling it directly. It takes an old style syntactic
10488 ;; element on the form (SYMBOL . ANCHOR-POS) and converts it to the
10491 ;; This function might do hidden buffer changes.
10492 (if (c-langelem-pos langelem
)
10493 (c-calc-offset (list (c-langelem-sym langelem
)
10494 (c-langelem-pos langelem
)))
10495 (c-calc-offset langelem
)))
10497 (defun c-get-syntactic-indentation (langelems)
10498 ;; Calculate the syntactic indentation from a syntactic description
10499 ;; as returned by `c-guess-syntax'.
10501 ;; Note that topmost-intro always has an anchor position at bol, for
10502 ;; historical reasons. It's often used together with other symbols
10503 ;; that has more sane positions. Since we always use the first
10504 ;; found anchor position, we rely on that these other symbols always
10505 ;; precede topmost-intro in the LANGELEMS list.
10507 ;; This function might do hidden buffer changes.
10508 (let ((indent 0) anchor
)
10511 (let* ((c-syntactic-element (car langelems
))
10512 (res (c-calc-offset c-syntactic-element
)))
10515 ;; Got an absolute column that overrides any indentation
10516 ;; we've collected so far, but not the relative
10517 ;; indentation we might get for the nested structures
10518 ;; further down the langelems list.
10519 (setq indent
(elt res
0)
10520 anchor
(point-min)) ; A position at column 0.
10522 ;; Got a relative change of the current calculated
10524 (setq indent
(+ indent res
))
10526 ;; Use the anchor position from the first syntactic
10527 ;; element with one.
10529 (setq anchor
(c-langelem-pos (car langelems
)))))
10531 (setq langelems
(cdr langelems
))))
10534 (+ indent
(save-excursion
10540 (cc-provide 'cc-engine
)
10542 ;;; cc-engine.el ends here