ob: safer conversion of results of scripting languages into elisp objects

* lisp/ob-python.el (org-babel-python-table-or-string): Using
  `org-babel-script-escape' for reading string input from scripting
  languages.

* lisp/ob-ruby.el (org-babel-ruby-table-or-string): Using
  `org-babel-script-escape' for reading string input from scripting
  languages.

* lisp/ob.el (org-babel-script-escape): Using
  `org-babel-script-escape' for reading string input from scripting
  languages.

* lisp/ob-haskell.el (org-babel-haskell-table-or-string): Using
  `org-babel-script-escape' for reading string input from scripting
  languages.

lisp/ob-haskell.el

@@ -136,16 +136,7 @@ then create one.  Return the initialized session."
   "Convert RESULTS to an Emacs-lisp table or string.
 If RESULTS look like a table, then convert them into an
 Emacs-lisp table, otherwise return the results as a string."
-  (org-babel-read
-   (if (and (stringp results) (string-match "^\\[.+\\]$" results))
-       (org-babel-read
-        (concat "'"
-                (replace-regexp-in-string
-                 "\\[" "(" (replace-regexp-in-string
-                            "\\]" ")" (replace-regexp-in-string
-                                       "," " " (replace-regexp-in-string
-                                                "'" "\"" results))))))
-     results)))
+  (org-babel-script-escape results))
 
 (defun org-babel-haskell-var-to-haskell (var)
   "Convert an elisp value VAR into a haskell variable.

lisp/ob-python.el

@@ -117,20 +117,7 @@ specifying a variable of the same value."
   "Convert RESULTS into an appropriate elisp value.
 If the results look like a list or tuple, then convert them into an
 Emacs-lisp table, otherwise return the results as a string."
-  ((lambda (res)
-     (if (listp res)
-	 (mapcar (lambda (el) (if (equal el 'None) 'hline el)) res)
-       res))
-   (org-babel-read
-    (if (and (stringp results) (string-match "^[([].+[])]$" results))
-       (org-babel-read
-        (concat "'"
-                (replace-regexp-in-string
-                 "\\[" "(" (replace-regexp-in-string
-                            "\\]" ")" (replace-regexp-in-string
-                                       ", " " " (replace-regexp-in-string
-                                                 "'" "\"" results t))))))
-     results))))
+  (org-babel-script-escape results))
 
 (defvar org-babel-python-buffers '((:default . nil)))
 

lisp/ob-ruby.el

@@ -116,16 +116,7 @@ specifying a variable of the same value."
   "Convert RESULTS into an appropriate elisp value.
 If RESULTS look like a table, then convert them into an
 Emacs-lisp table, otherwise return the results as a string."
-  (org-babel-read
-   (if (and (stringp results) (string-match "^\\[.+\\]$" results))
-       (org-babel-read
-        (concat "'"
-                (replace-regexp-in-string
-                 "\\[" "(" (replace-regexp-in-string
-                            "\\]" ")" (replace-regexp-in-string
-                                       ", " " " (replace-regexp-in-string
-						 "'" "\"" results))))))
-     results)))
+  (org-babel-script-escape results))
 
 (defun org-babel-ruby-initiate-session (&optional session params)
   "Initiate a ruby session.

lisp/ob.el

@@ -1757,6 +1757,38 @@ block but are passed literally to the \"example-block\"."
   "Strip protective commas from bodies of source blocks."
   (replace-regexp-in-string "^,#" "#" body))
 
+(defun org-babel-script-escape (str)
+  "Safely convert tables into elisp lists."
+  (let (in-single in-double out)
+    (org-babel-read
+     (if (and (stringp str) (string-match "^\\[.+\\]$" str))
+	 (org-babel-read
+	  (concat
+	   "'"
+	   (progn
+	     (mapc
+	      (lambda (ch)
+		(setq
+		 out
+		 (case ch
+		   (91 (if (or in-double in-single) ; [
+			   (cons 91 out)
+			 (cons 40 out)))
+		   (93 (if (or in-double in-single) ; ]
+			   (cons 93 out)
+			 (cons 41 out)))
+		   (44 (if (or in-double in-single) (cons 44 out) out)) ; ,
+		   (39 (if in-double	; '
+			   (cons 39 out)
+			 (setq in-single (not in-single)) (cons 34 out)))
+		   (34 (if in-single	; "
+			   (append (list 34 32) out)
+			 (setq in-double (not in-double)) (cons 34 out)))
+		   (t  (cons ch out)))))
+	      (string-to-list str))
+	     (apply #'string (reverse out)))))
+       str))))
+
 (defun org-babel-read (cell)
   "Convert the string value of CELL to a number if appropriate.
 Otherwise if cell looks like lisp (meaning it starts with a