diff options
Diffstat (limited to 'lisp/progmodes/cc-fonts.el')
| -rw-r--r-- | lisp/progmodes/cc-fonts.el | 224 |
1 files changed, 216 insertions, 8 deletions
diff --git a/lisp/progmodes/cc-fonts.el b/lisp/progmodes/cc-fonts.el index 7e7053b98e1..967464ac14d 100644 --- a/lisp/progmodes/cc-fonts.el +++ b/lisp/progmodes/cc-fonts.el @@ -93,10 +93,15 @@ (cc-bytecomp-defvar c-preprocessor-face-name) (cc-bytecomp-defvar c-reference-face-name) (cc-bytecomp-defvar c-block-comment-flag) +(cc-bytecomp-defvar c-type-finder-pos) +(cc-bytecomp-defvar c-inhibit-type-finder) +(cc-bytecomp-defvar c-type-finder-timer) (cc-bytecomp-defun c-fontify-recorded-types-and-refs) (cc-bytecomp-defun c-font-lock-declarators) (cc-bytecomp-defun c-font-lock-objc-method) (cc-bytecomp-defun c-font-lock-invalid-string) +(cc-bytecomp-defun c-before-context-fl-expand-region) +(cc-bytecomp-defun c-font-lock-fontify-region) ;; Note that font-lock in XEmacs doesn't expand face names as @@ -919,13 +924,6 @@ casts and declarations are fontified. Used on level 2 and higher." ;; This function does hidden buffer changes. ;;(message "c-font-lock-complex-decl-prepare %s %s" (point) limit) - - ;; Clear the list of found types if we start from the start of the - ;; buffer, to make it easier to get rid of misspelled types and - ;; variables that have gotten recognized as types in malformed code. - (when (bobp) - (c-clear-found-types)) - (c-skip-comments-and-strings limit) (when (< (point) limit) @@ -1605,6 +1603,175 @@ casts and declarations are fontified. Used on level 2 and higher." nil)))) +(defun c-find-types-background (start limit) + ;; Find any "found types" between START and LIMIT. Allow any such types to + ;; be entered into `c-found-types' by the action of `c-forward-name' or + ;; `c-forward-type' called from this function. This process also causes + ;; occurrences of the type to be prepared for fontification throughout the + ;; buffer. + ;; + ;; Return POINT at the end of the function. This should be at or after + ;; LIMIT, and not later than the next decl-spot after LIMIT. + ;; + ;; This function is called from the timer `c-type-finder-timer'. It may do + ;; hidden buffer changes. + (save-excursion + (save-restriction + (widen) + (goto-char start) + ;; If we're in a (possibly large) literal, skip over it. + (let ((lit-bounds (nth 2 (c-full-pp-to-literal (point))))) + (if lit-bounds + (goto-char (cdr lit-bounds)))) + (when (< (point) limit) + (let (;; o - 'decl if we're in an arglist containing declarations + ;; (but if `c-recognize-paren-inits' is set it might also be + ;; an initializer arglist); + ;; o - '<> if the arglist is of angle bracket type; + ;; o - 'arglist if it's some other arglist; + ;; o - nil, if not in an arglist at all. This includes the + ;; parenthesized condition which follows "if", "while", etc. + context + ;; A list of starting positions of possible type declarations, or of + ;; the typedef preceding one, if any. + last-cast-end + ;; The result from `c-forward-decl-or-cast-1'. + decl-or-cast + ;; The maximum of the end positions of all the checked type + ;; decl expressions in the successfully identified + ;; declarations. The position might be either before or + ;; after the syntactic whitespace following the last token + ;; in the type decl expression. + (max-type-decl-end 0) + ;; Same as `max-type-decl-*', but used when we're before + ;; `token-pos'. + (max-type-decl-end-before-token 0) + ) + (goto-char start) + (c-find-decl-spots + limit + c-decl-start-re + nil ; (eval c-maybe-decl-faces) + + (lambda (match-pos inside-macro &optional toplev) + ;; Note to maintainers: don't use `limit' inside this lambda form; + ;; c-find-decl-spots sometimes narrows to less than `limit'. + (if (and c-macro-with-semi-re + (looking-at c-macro-with-semi-re)) + ;; Don't do anything more if we're looking at something that + ;; can't start a declaration. + t + + ;; Set `context' and `c-restricted-<>-arglists'. Look for + ;; "<" for the sake of C++-style template arglists. + ;; "Ignore "(" when it's part of a control flow construct + ;; (e.g. "for ("). + (let ((got-context + (c-get-fontification-context + match-pos + (< match-pos (if inside-macro + max-type-decl-end-before-token + max-type-decl-end)) + toplev))) + (setq context (car got-context) + c-restricted-<>-arglists (cdr got-context))) + + ;; In QT, "more" is an irritating keyword that expands to nothing. + ;; We skip over it to prevent recognition of "more slots: <symbol>" + ;; as a bitfield declaration. + (when (and (c-major-mode-is 'c++-mode) + (looking-at + (concat "\\(more\\)\\([^" c-symbol-chars "]\\|$\\)"))) + (goto-char (match-end 1)) + (c-forward-syntactic-ws)) + + ;; Now analyze the construct. This analysis will cause + ;; `c-forward-name' and `c-forward-type' to call `c-add-type', + ;; triggering the desired recognition and fontification of + ;; these found types. + (when (not (eq context 'not-decl)) + (setq decl-or-cast + (c-forward-decl-or-cast-1 + match-pos context last-cast-end)) + + (cond + ((eq decl-or-cast 'cast) + ;; Save the position after the previous cast so we can feed + ;; it to `c-forward-decl-or-cast-1' in the next round. That + ;; helps it discover cast chains like "(a) (b) c". + (setq last-cast-end (point)) + nil) + (decl-or-cast + ;; We've found a declaration. + + ;; Set `max-type-decl-end' or `max-type-decl-end-before-token' + ;; under the assumption that we're after the first type decl + ;; expression in the declaration now. That's not really true; + ;; we could also be after a parenthesized initializer + ;; expression in C++, but this is only used as a last resort + ;; to slant ambiguous expression/declarations, and overall + ;; it's worth the risk to occasionally fontify an expression + ;; as a declaration in an initializer expression compared to + ;; getting ambiguous things in normal function prototypes + ;; fontified as expressions. + (if inside-macro + (when (> (point) max-type-decl-end-before-token) + (setq max-type-decl-end-before-token (point))) + (when (> (point) max-type-decl-end) + (setq max-type-decl-end (point))))) + (t t)))))))) + (point)))) + +(defun c-type-finder-timer-func () + ;; A CC Mode idle timer function for finding "found types". It triggers + ;; every `c-type-finder-repeat-time' seconds and processes buffer chunks of + ;; size around `c-type-finder-chunk-size' characters, and runs for (a little + ;; over) `c-type-finder-time-slot' seconds. The types it finds are inserted + ;; into `c-found-types', and their occurrences throughout the buffer are + ;; prepared for fontification. + (when (and c-type-finder-time-slot + (boundp 'font-lock-support-mode) + (eq font-lock-support-mode 'jit-lock-mode)) + (if c-inhibit-type-finder ; No processing immediately after a GC operation. + (setq c-inhibit-type-finder nil) + (let* ((stop-time (+ (float-time) c-type-finder-time-slot)) + (buf-list (buffer-list))) + ;; One CC Mode buffer needing processing each time around this loop. + (while (and buf-list + (< (float-time) stop-time)) + ;; Cdr through BUF-LIST to find the next buffer needing processing. + (while (and buf-list + (not (with-current-buffer (car buf-list) c-type-finder-pos))) + (setq buf-list (cdr buf-list))) + (when buf-list + (with-current-buffer (car buf-list) + ;; (message "%s" (current-buffer)) ; Useful diagnostic. + (save-restriction + (widen) + ;; Process one `c-type-finder-chunk-size' chunk each time + ;; around this loop. + (while (and c-type-finder-pos + (< (float-time) stop-time)) + ;; Process one chunk per iteration. + (save-match-data + (c-save-buffer-state + (case-fold-search + (beg (marker-position c-type-finder-pos)) + (end (min (+ beg c-type-finder-chunk-size) (point-max))) + (region (c-before-context-fl-expand-region beg end))) + (setq beg (car region) + end (cdr region)) + (setq beg (max (c-find-types-background beg end) end)) + (move-marker c-type-finder-pos + (if (save-excursion (goto-char beg) (eobp)) + nil + beg)) + (when (not (marker-position c-type-finder-pos)) + (setq c-type-finder-pos nil)))))))))))) + ;; Set the timer to run again. + (setq c-type-finder-timer + (run-at-time c-type-finder-repeat-time nil #'c-type-finder-timer-func))) + (defun c-font-lock-enum-body (limit) ;; Fontify the identifiers of each enum we find by searching forward. ;; @@ -1765,7 +1932,7 @@ casts and declarations are fontified. Used on level 2 and higher." (> (match-beginning 0) (point-min)) (memq (c-get-char-property (1- (match-beginning 0)) 'face) '(font-lock-comment-face font-lock-string-face - font-lock-comment-delimiter-face)))) + font-lock-comment-delimiter-face)))) (when found (setq open-delim (cons (match-beginning 1) (cons (match-end 1) (match-beginning 2))) @@ -2255,6 +2422,47 @@ higher." ;; defvar will install its default value later on. (makunbound def-var))) +;; `c-re-redisplay-timer' is a timer which, when triggered, causes a +;; redisplay. +(defvar c-re-redisplay-timer nil) + +(defun c-force-redisplay (start end) + ;; Force redisplay immediately. This assumes `font-lock-support-mode' is + ;; 'jit-lock-mode. Set the variable `c-re-redisplay-timer' to nil. + (save-excursion (c-font-lock-fontify-region start end)) + (jit-lock-force-redisplay (copy-marker start) (copy-marker end)) + (setq c-re-redisplay-timer nil)) + +(defun c-fontify-new-found-type (type) + ;; Cause the fontification of TYPE, a string, wherever it occurs in the + ;; buffer. If TYPE is currently displayed in a window, cause redisplay to + ;; happen "instantaneously". These actions are done only when jit-lock-mode + ;; is active. + (when (and font-lock-mode + (boundp 'font-lock-support-mode) + (eq font-lock-support-mode 'jit-lock-mode)) + (c-save-buffer-state + ((window-boundaries + (mapcar (lambda (win) + (cons (window-start win) + (window-end win))) + (get-buffer-window-list (current-buffer) 'no-mini t))) + (target-re (concat "\\_<" type "\\_>"))) + (save-excursion + (save-restriction + (widen) + (goto-char (point-min)) + (while (re-search-forward target-re nil t) + (put-text-property (match-beginning 0) (match-end 0) + 'fontified nil) + (dolist (win-boundary window-boundaries) + (when (and (< (match-beginning 0) (cdr win-boundary)) + (> (match-end 0) (car win-boundary)) + (not c-re-redisplay-timer)) + (setq c-re-redisplay-timer + (run-with-timer 0 nil #'c-force-redisplay + (match-beginning 0) (match-end 0))))))))))) + ;;; C. |