* misc/ruby-mode.el: Use preceding-char/following-char

(returning 0 at BOF/EOF) instead of char-before/char-after
  (returning nil at BOF/EOF) to avoid error from char-syntax when
  at BOF/EOF.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@43189 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ChangeLog

@@ -1,3 +1,10 @@
+Tue Oct  8 04:28:25 2013  Akinori MUSHA  <knu@iDaemons.org>
+
+	* misc/ruby-mode.el: Use preceding-char/following-char
+	  (returning 0 at BOF/EOF) instead of char-before/char-after
+	  (returning nil at BOF/EOF) to avoid error from char-syntax when
+	  at BOF/EOF.
+
 Tue Oct  8 04:12:45 2013  Akinori MUSHA  <knu@iDaemons.org>
 
 	* misc/ruby-additional.el (ruby-mode-set-encoding): Add a missing

misc/ruby-mode.el

@@ -448,7 +448,7 @@ Emacs to Ruby."
        ((progn
           (forward-char -1)
           (and (looking-at "\\?")
-               (or (eq (char-syntax (char-before (point))) ?w)
+               (or (eq (char-syntax (preceging-char)) ?w)
                    (ruby-special-char-p))))
         nil)
        ((and (eq option 'heredoc) (< space 0))
@@ -1201,14 +1201,14 @@ balanced expression is found."
     (let ((orig (point)) (end (progn (ruby-forward-sexp) (point))))
       (when (eq (char-before) ?\})
 	(delete-char -1)
-	(if (eq (char-syntax (char-before)) ?w)
+	(if (eq (char-syntax (preceding-char)) ?w)
 	    (insert " "))
 	(insert "end")
-	(if (eq (char-syntax (char-after)) ?w)
+	(if (eq (char-syntax (following-char)) ?w)
 	    (insert " "))
 	(goto-char orig)
 	(delete-char 1)
-	(if (eq (char-syntax (char-before)) ?w)
+	(if (eq (char-syntax (preceding-char)) ?w)
 	    (insert " "))
 	(insert "do")
 	(when (looking-at "\\sw\\||")
@@ -1218,7 +1218,7 @@ balanced expression is found."
 
 (defun ruby-do-end-to-brace ()
   (when (and (or (bolp)
-		 (not (memq (char-syntax (char-before)) '(?w ?_))))
+		 (not (memq (char-syntax (preceding-char)) '(?w ?_))))
 	     (looking-at "\\<do\\(\\s \\|$\\)"))
     (let ((orig (point)) (end (progn (ruby-forward-sexp) (point))))
       (backward-char 3)