From: Alan Mackenzie Date: Thu, 25 Apr 2019 15:18:12 +0000 (+0000) Subject: Fix some corner cases in the recognition of C++ raw strings. X-Git-Tag: emacs-27.0.90~3092 X-Git-Url: http://git.eshelyaron.com/gitweb/?a=commitdiff_plain;h=efb8921a574437aed6209695891c14860bd55f51;p=emacs.git Fix some corner cases in the recognition of C++ raw strings. These are where changing the identifier in a raw string delimiter causes different delimiters to match eachother. * lisp/progmodes/cc-engine.el (c-raw-string-end-delim-disrupted): New variable. (c-before-change-check-raw-strings): Use new variable. (c-after-change-unmark-raw-strings): When typing into an opening delimiter or altering its close delimiter causes the opening delimiter to match a later closing delimiter, clear all syntax-table char properties from the opening delimiter onwards, and set c-new-END to point max. Also, when changing a closing delimiter, check whether its new value matches a previously open opening delimiter earlier in the buffer, and amend the syntax-table text properties appropriately. --- diff --git a/lisp/progmodes/cc-engine.el b/lisp/progmodes/cc-engine.el index 80115fb3a35..6b44aae0884 100644 --- a/lisp/progmodes/cc-engine.el +++ b/lisp/progmodes/cc-engine.el @@ -6567,6 +6567,9 @@ comment at the start of cc-engine.el for more info." ;; BEG and END. (defvar c-old-beg-rs nil) (defvar c-old-end-rs nil) +;; Whether a buffer change has disrupted or will disrupt the terminating id of +;; a raw string. +(defvar c-raw-string-end-delim-disrupted nil) (defun c-raw-string-pos () ;; Get POINT's relationship to any containing raw string. @@ -6768,17 +6771,12 @@ comment at the start of cc-engine.el for more info." ;; This function is called as a before-change function solely due to its ;; membership of the C++ value of `c-get-state-before-change-functions'. (goto-char end) + (setq c-raw-string-end-delim-disrupted nil) ;; We use the following to detect a R"( being swallowed into a string by ;; the pending change. (setq c-old-END-literality (c-in-literal)) (c-save-buffer-state - (;; (beg-rs (progn (goto-char beg) (c-raw-string-pos))) - ;; (end-rs (progn (goto-char end) (c-raw-string-pos))) - ; FIXME!!! - ; Optimize this so that we don't call - ; `c-raw-string-pos' twice when once - ; will do. (2016-06-02). - (term-del (c-raw-string-in-end-delim beg end)) + ((term-del (c-raw-string-in-end-delim beg end)) Rquote close-quote) (setq c-old-beg-rs (progn (goto-char beg) (c-raw-string-pos)) c-old-end-rs (progn (goto-char end) (c-raw-string-pos))) @@ -6792,6 +6790,7 @@ comment at the start of cc-engine.el for more info." (<= (car term-del) (nth 3 c-old-beg-rs)))) (setq Rquote (1- (cadr c-old-beg-rs)) close-quote (1+ (cdr term-del))) + (setq c-raw-string-end-delim-disrupted t) (c-depropertize-raw-strings-in-region Rquote close-quote) (setq c-new-BEG (min c-new-BEG Rquote) c-new-END (max c-new-END close-quote))) @@ -6991,42 +6990,45 @@ comment at the start of cc-engine.el for more info." (c-point 'eol)) (c-clear-char-property (1- (point)) 'syntax-table)))) + ;; Have we matched up with an existing terminator by typing into an + ;; opening delimiter? ... or by messing up a raw string's terminator so + ;; that it now matches a later terminator? + (when + (or c-raw-string-end-delim-disrupted + (and c-old-beg-rs + (eq (car c-old-beg-rs) 'open-delim))) + (goto-char (cadr c-old-beg-rs)) + (when (looking-at "\"\\([^ ()\\\n\r\t]\\{0,16\\}\\)(") + (setq id (match-string-no-properties 1)) + (when (re-search-forward (concat ")" id "\"") nil t) ; No bound. + (setq c-new-END (point-max)) + (c-clear-char-properties (cadr c-old-beg-rs) c-new-END + 'syntax-table) + (c-truncate-semi-nonlit-pos-cache (cadr c-old-beg-rs))))) ;; Have we terminated an existing raw string by inserting or removing ;; text? (when (eq c-old-END-literality 'string) - (setq state (c-state-semi-pp-to-literal beg)) - (cond - ;; Possibly terminating a(n un)terminated raw string. - ((eq (nth 3 (car state)) t) - (goto-char (nth 8 (car state))) - (when - (and (eq (char-after) ?\() - (search-backward-regexp - "R\"\\([^ ()\\\n\r\t]\\{0,16\\}\\)\\=" (- (point) 18) t)) - (setq id (match-string-no-properties 1) - found-beg (match-beginning 0) - found-end (1+ (match-end 0))))) - ;; Possibly terminating an already terminated raw string. - ((eq (nth 3 (car state)) ?\") - (goto-char (nth 8 (car state))) - (when - (and (eq (char-before) ?R) - (looking-at "\"\\([^ ()\\\n\r\t]\\{0,16\\}\\)(")) - (setq id (match-string-no-properties 1) - found-beg (1- (point)) - found-end (match-end 0))))) - (when id - (goto-char (max (- beg 18) (point-min))) - (when (search-forward (concat ")" id "\"") (+ end 1 (length id)) t) - ;; Has an earlier close delimiter just been inserted into an - ;; already terminated raw string? - (if (and (eq (nth 3 (car state)) ?\") - (search-forward (concat ")" id "\"") nil t)) - (setq found-end (point))) - (setq c-new-BEG (min c-new-BEG found-beg) - c-new-END (max c-new-END found-end)) - (c-clear-char-properties found-beg found-end 'syntax-table) - (c-truncate-semi-nonlit-pos-cache found-beg)))) + ;; Have we just made or modified a closing delimiter? + (goto-char (max (- beg 18) (point-min))) + (while + (and + (setq found + (search-forward-regexp ")\\([^ ()\\\n\r\t]\\{0,16\\}\\)\"" + (+ end 17) t)) + (< (match-end 0) beg))) + (when (and found (<= (match-beginning 0) end)) + (setq id (match-string-no-properties 1)) + (goto-char (match-beginning 0)) + (while + (and + (setq found (search-backward (concat "R\"" id "(") nil t)) + (setq state (c-state-semi-pp-to-literal (point))) + (memq (nth 3 (car state)) '(t ?\")))) + (when found + (setq c-new-BEG (min (point) c-new-BEG) + c-new-END (point-max)) + (c-clear-char-properties (point) c-new-END 'syntax-table) + (c-truncate-semi-nonlit-pos-cache (point))))) ;; Are there any raw strings in a newly created macro? (when (< beg end)