(make-variable-buffer-local 'c-new-BEG)
(defvar c-new-END 0)
(make-variable-buffer-local 'c-new-END)
+;; The following two variables record the values of `c-new-BEG' and
+;; `c-new-END' just after `c-new-END' has been adjusted for the length of text
+;; inserted or removed. They may be read by any after-change function (but
+;; should not be altered by one).
+(defvar c-old-BEG 0)
+(make-variable-buffer-local 'c-old-BEG)
+(defvar c-old-END 0)
+(make-variable-buffer-local 'c-old-END)
(defun c-common-init (&optional mode)
"Common initialization for all CC Mode modes.
(memq (cadr (backtrace-frame 3))
'(put-text-property remove-list-of-text-properties)))
+(defun c-depropertize-CPP (beg end)
+ ;; Remove the punctuation syntax-table text property from the CPP parts of
+ ;; (c-new-BEG c-new-END).
+ ;;
+ ;; This function is in the C/C++/ObjC values of
+ ;; `c-get-state-before-change-functions' and is called exclusively as a
+ ;; before change function.
+ (c-save-buffer-state ()
+ (goto-char c-new-BEG)
+ (while (and (< (point) beg)
+ (search-forward-regexp c-anchored-cpp-prefix beg t))
+ (goto-char (match-beginning 1))
+ (let ((m-beg (point)))
+ (c-end-of-macro)
+ (c-clear-char-property-with-value
+ m-beg (min (point) beg) 'syntax-table '(1))))
+
+ (goto-char end)
+ (while (and (< (point) c-new-END)
+ (search-forward-regexp c-anchored-cpp-prefix c-new-END t))
+ (goto-char (match-beginning 1))
+ (let ((m-beg (point)))
+ (c-end-of-macro)
+ (c-clear-char-property-with-value
+ m-beg (min (point) c-new-END) 'syntax-table '(1))))))
+
(defun c-extend-region-for-CPP (beg end)
;; Adjust `c-new-BEG', `c-new-END' respectively to the beginning and end of
- ;; any preprocessor construct they may be in.
+ ;; any preprocessor construct they may be in.
;;
;; Point is undefined both before and after this function call; the buffer
;; has already been widened, and match-data saved. The return value is
; with a c-cpp-delimiter category property
(setq c-new-END (point)))
+(defun c-depropertize-new-text (beg end old-len)
+ ;; Remove from the new text in (BEG END) any and all text properties which
+ ;; might interfere with CC Mode's proper working.
+ ;;
+ ;; This function is called exclusively as an after-change function. It
+ ;; appears in the value (for all languages) of
+ ;; `c-before-font-lock-functions'. The value of point is undefined both on
+ ;; entry and exit, and the return value has no significance. The parameters
+ ;; BEG, END, and OLD-LEN are the standard ones supplied to all after-change
+ ;; functions.
+ (c-save-buffer-state ()
+ (when (> end beg)
+ (c-clear-char-properties beg end 'syntax-table)
+ (c-clear-char-properties beg end 'category)
+ (c-clear-char-properties beg end 'c-is-sws)
+ (c-clear-char-properties beg end 'c-in-sws)
+ (c-clear-char-properties beg end 'c-type)
+ (c-clear-char-properties beg end 'c-awk-NL-prop))))
+
(defun c-extend-font-lock-region-for-macros (begg endd old-len)
;; Extend the region (c-new-BEG c-new-END) to cover all (possibly changed)
;; preprocessor macros; The return value has no significance.
;; Note: SPEED _MATTERS_ IN THIS FUNCTION!!!
;;
;; This function might make hidden buffer changes.
- (c-save-buffer-state (limits )
+ (c-save-buffer-state (limits)
;; Clear 'syntax-table properties "punctuation":
- (c-clear-char-property-with-value c-new-BEG c-new-END 'syntax-table '(1))
+ ;; (c-clear-char-property-with-value c-new-BEG c-new-END 'syntax-table '(1))
;; CPP "comment" markers:
(if (eval-when-compile (memq 'category-properties c-emacs-features));Emacs.
(forward-line)) ; no infinite loop with, e.g., "#//"
)))))
+(defun c-before-after-change-digit-quote (beg end &optional old-len)
+ ;; This function either removes or applies the punctuation value ('(1)) of
+ ;; the `syntax-table' text property on single quote marks which are
+ ;; separator characters in long integer literals, e.g. "4'294'967'295". It
+ ;; applies to both decimal/octal and hex literals. (FIXME (2016-06-10): it
+ ;; should also apply to binary literals.)
+ ;;
+ ;; In both uses of the function, the `syntax-table' properties are
+ ;; removed/applied only on quote marks which appear to be digit separators.
+ ;;
+ ;; Point is undefined on both entry and exit to this function, and the
+ ;; return value has no significance. The function is called solely as a
+ ;; before-change function (see `c-get-state-before-change-functions') and as
+ ;; an after change function (see `c-before-font-lock-functions', with the
+ ;; parameters BEG, END, and (optionally) OLD-LEN being given the standard
+ ;; values for before/after-change functions.
+ (c-save-buffer-state ((num-begin c-new-BEG) digit-re try-end)
+ (goto-char c-new-END)
+ (when (looking-at "\\(x\\)?[0-9a-fA-F']+")
+ (setq c-new-END (match-end 0)))
+ (goto-char c-new-BEG)
+ (when (looking-at "\\(x?\\)[0-9a-fA-F']")
+ (if (re-search-backward "\\(0x\\)?[0-9a-fA-F]*\\=" nil t)
+ (setq c-new-BEG (point))))
+
+ (while
+ (re-search-forward "[0-9a-fA-F]'[0-9a-fA-F]" c-new-END t)
+ (setq try-end (1- (point)))
+ (re-search-backward "[^0-9a-fA-F']" num-begin t)
+ (setq digit-re
+ (cond
+ ((and (not (bobp)) (eq (char-before) ?0) (memq (char-after) '(?x ?X)))
+ "[0-9a-fA-F]")
+ ((and (eq (char-after (1+ (point))) ?0)
+ (memq (char-after (+ 2 (point))) '(?b ?B)))
+ "[01]")
+ ((memq (char-after (1+ (point))) '(?0 ?1 ?2 ?3 ?4 ?5 ?6 ?7 ?8 ?9))
+ "[0-9]")
+ (t nil)))
+ (when digit-re
+ (cond ((eq (char-after) ?x) (forward-char))
+ ((looking-at ".?0[Bb]") (goto-char (match-end 0)))
+ ((looking-at digit-re))
+ (t (forward-char)))
+ (when (not (c-in-literal))
+ (let ((num-end ; End of valid sequence of digits/quotes.
+ (save-excursion
+ (re-search-forward
+ (concat "\\=\\(" digit-re "+'\\)*" digit-re "+") nil t)
+ (point))))
+ (setq try-end ; End of sequence of digits/quotes
+ (save-excursion
+ (re-search-forward
+ (concat "\\=\\(" digit-re "\\|'\\)+") nil t)
+ (point)))
+ (while (re-search-forward
+ (concat digit-re "\\('\\)" digit-re) num-end t)
+ (if old-len ; i.e. are we in an after-change function?
+ (c-put-char-property (match-beginning 1) 'syntax-table '(1))
+ (c-clear-char-property (match-beginning 1) 'syntax-table))
+ (backward-char)))))
+ (goto-char try-end)
+ (setq num-begin (point)))))
+
(defun c-before-change (beg end)
;; Function to be put on `before-change-functions'. Primarily, this calls
;; the language dependent `c-get-state-before-change-functions'. It is
;; (c-new-BEG c-new-END) will be the region to fontify. It may become
;; larger than (beg end).
- ;; (setq c-new-BEG beg c-new-END end)
(setq c-new-END (- (+ c-new-END (- end beg)) old-len))
+ (setq c-old-BEG c-new-BEG c-old-END c-new-END)
(unless (c-called-from-text-property-change-p)
(setq c-just-done-before-change nil)
;; This function is called indirectly from font locking stuff - either from
;; c-after-change (to prepare for after-change font-locking) or from font
;; lock context (etc.) fontification.
- (let ((lit-limits (c-literal-limits))
+ (let ((lit-start (c-literal-start))
(new-pos pos)
bod-lim bo-decl)
(goto-char (c-point 'bol new-pos))
- (when lit-limits ; Comment or string.
- (goto-char (car lit-limits)))
+ (when lit-start ; Comment or string.
+ (goto-char lit-start))
(setq bod-lim (c-determine-limit 500))
(while
;; Go to a less nested declaration each time round this loop.
(and
- (eq (car (c-beginning-of-decl-1 bod-lim)) 'same)
+ (c-syntactic-skip-backward "^;{}" bod-lim t)
(> (point) bod-lim)
- (progn (setq bo-decl (point))
+ (progn (c-forward-syntactic-ws)
+ (setq bo-decl (point))
;; Are we looking at a keyword such as "template" or
;; "typedef" which can decorate a type, or the type itself?
(when (or (looking-at c-prefix-spec-kwds-re)
;;;###autoload (add-to-list 'auto-mode-alist '("\\.[ch]\\(pp\\|xx\\|\\+\\+\\)\\'" . c++-mode))
;;;###autoload (add-to-list 'auto-mode-alist '("\\.\\(CC?\\|HH?\\)\\'" . c++-mode))
-;;;###autoload (add-to-list 'auto-mode-alist '("\\.[ch]\\'" . c-mode))
+;;;###autoload (add-to-list 'auto-mode-alist '("\\.c\\'" . c-mode))
+;;;###autoload (add-to-list 'auto-mode-alist '("\\.h\\'" . c-or-c++-mode))
;; NB: The following two associate yacc and lex files to C Mode, which
;; is not really suitable for those formats. Anyway, afaik there's
(cc-imenu-init cc-imenu-c-generic-expression)
(c-run-mode-hooks 'c-mode-common-hook))
+(defconst c-or-c++-mode--regexp
+ (eval-when-compile
+ (let ((id "[a-zA-Z0-9_]+") (ws "[ \t\r]+") (ws-maybe "[ \t\r]*"))
+ (concat "^" ws-maybe "\\(?:"
+ "using" ws "\\(?:namespace" ws "std;\\|std::\\)"
+ "\\|" "namespace" "\\(:?" ws id "\\)?" ws-maybe "{"
+ "\\|" "class" ws id ws-maybe "[:{\n]"
+ "\\|" "template" ws-maybe "<.*>"
+ "\\|" "#include" ws-maybe "<\\(?:string\\|iostream\\|map\\)>"
+ "\\)")))
+ "A regexp applied to C header files to check if they are really C++.")
+
+;;;###autoload
+(defun c-or-c++-mode ()
+ "Analyse buffer and enable either C or C++ mode.
+
+Some people and projects use .h extension for C++ header files
+which is also the one used for C header files. This makes
+matching on file name insufficient for detecting major mode that
+should be used.
+
+This function attempts to use file contents to determine whether
+the code is C or C++ and based on that chooses whether to enable
+`c-mode' or `c++-mode'."
+ (if (save-excursion
+ (save-restriction
+ (save-match-data
+ (widen)
+ (goto-char (point-min))
+ (re-search-forward c-or-c++-mode--regexp
+ (+ (point) c-guess-region-max) t))))
+ (c++-mode)
+ (c-mode)))
+
\f
;; Support for C++