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Fix lisp indent infloop on unfinished strings (Bug#37045)

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* lisp/emacs-lisp/lisp-mode.el (lisp-indent-calc-next): Stop trying to
skip over strings if we've hit the end of buffer.
* test/lisp/emacs-lisp/lisp-mode-tests.el
(lisp-indent-unfinished-string): New test.
This commit is contained in:
Noam Postavsky 2019-08-16 07:26:40 -04:00
parent 5f992d1990
commit bcd0115e4d
2 changed files with 15 additions and 6 deletions
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15
lisp/emacs-lisp/lisp-mode.el
View file

@ -810,7 +810,7 @@ by more than one line to cross a string literal."
(setq last-sexp (nth 2 ppss)))
(setq depth (car ppss))
;; Skip over newlines within strings.
(nth 3 ppss))
(and (not (eobp)) (nth 3 ppss)))
(let ((string-start (nth 8 ppss)))
(setq ppss (parse-partial-sexp (point) (point-max)
nil nil ppss 'syntax-table))
@ -826,17 +826,22 @@ by more than one line to cross a string literal."
indent-stack)))))
(prog1
(let (indent)
(cond ((= (forward-line 1) 1) nil)
;; Negative depth, probably some kind of syntax error.
(cond ((= (forward-line 1) 1)
;; Can't move to the next line, apparently end of buffer.
nil)
((null indent-stack)
;; Reset state.
;; Negative depth, probably some kind of syntax
;; error. Reset the state.
(setq ppss (parse-partial-sexp (point) (point))))
((car indent-stack))
((integerp (setq indent (calculate-lisp-indent ppss)))
(setf (car indent-stack) indent))
((consp indent) ; (COLUMN CONTAINING-SEXP-START)
(car indent))
;; This only happens if we're in a string.
;; This only happens if we're in a string, but the
;; loop should always skip over strings (unless we hit
;; end of buffer, which is taken care of by the first
;; clause).
(t (error "This shouldn't happen"))))
(setf (lisp-indent-state-stack state) indent-stack)
(setf (lisp-indent-state-ppss-point state) ppss-point)

6
test/lisp/emacs-lisp/lisp-mode-tests.el
View file

@ -284,7 +284,11 @@ Expected initialization file: `%s'\"
(lisp-indent-line)
(should (equal (buffer-string) "prompt> foo"))))
(ert-deftest lisp-indent-unfinished-string ()
"Don't infloop on unfinished string (Bug#37045)."
(with-temp-buffer
(insert "\"\n")
(lisp-indent-region (point-min) (point-max))))
(provide 'lisp-mode-tests)
;;; lisp-mode-tests.el ends here