org-feed: Use `xml-substitute-special' for unescaping XML entities.

* org-feed.el (xml-substitute-special): Declare function for byte
compiler.
(org-feed-unescape): Removed.
(org-feed-parse-rss-entry, org-feed-parse-atom-entry): Use
`xml-substitute-special' to unescape XML entities.

TINYCHANGE

Patch by Michael Brand

lisp/org-feed.el

@@ -99,7 +99,7 @@
 (declare-function xml-get-children "xml" (node child-name))
 (declare-function xml-get-attribute "xml" (node attribute))
 (declare-function xml-get-attribute-or-nil "xml" (node attribute))
-(defvar xml-entity-alist)
+(declare-function xml-substitute-special "xml" (string))
 
 (defgroup org-feed  nil
   "Options concerning RSS feeds as inputs for Org files."
@@ -269,17 +269,6 @@ have been saved."
 (defvar org-feed-buffer "*Org feed*"
   "The buffer used to retrieve a feed.")
 
-(defun org-feed-unescape (s)
-  "Unescape protected entities in S."
-  (require 'xml)
-  (let ((re (concat "&\\("
-		    (mapconcat 'car xml-entity-alist "\\|")
-		    "\\);")))
-    (while (string-match re s)
-      (setq s (replace-match
-	       (cdr (assoc (match-string 1 s) xml-entity-alist)) nil nil s)))
-    s))
-
 ;;;###autoload
 (defun org-feed-update-all ()
   "Get inbox items from all feeds in `org-feed-alist'."
@@ -613,6 +602,7 @@ containing the properties `:guid' and `:item-full-text'."
 
 (defun org-feed-parse-rss-entry (entry)
   "Parse the `:item-full-text' field for xml tags and create new properties."
+  (require 'xml)
   (with-temp-buffer
     (insert (plist-get entry :item-full-text))
     (goto-char (point-min))
@@ -620,7 +610,7 @@ containing the properties `:guid' and `:item-full-text'."
 			      nil t)
       (setq entry (plist-put entry
 			     (intern (concat ":" (match-string 1)))
-			     (org-feed-unescape (match-string 2)))))
+			     (xml-substitute-special (match-string 2)))))
     (goto-char (point-min))
     (unless (re-search-forward "isPermaLink[ \t]*=[ \t]*\"false\"" nil t)
       (setq entry (plist-put entry :guid-permalink t))))
@@ -654,7 +644,7 @@ formatted as a string, not the original XML data."
 			    'href)))
     ;; Add <title/> as :title.
     (setq entry (plist-put entry :title
-			   (org-feed-unescape
+			   (xml-substitute-special
 			    (car (xml-node-children
 				  (car (xml-get-children xml 'title)))))))
     (let* ((content (car (xml-get-children xml 'content)))
@@ -664,12 +654,12 @@ formatted as a string, not the original XML data."
 	 ((string= type "text")
 	  ;; We like plain text.
 	  (setq entry (plist-put entry :description
-				 (org-feed-unescape
+				 (xml-substitute-special
 				  (car (xml-node-children content))))))
 	 ((string= type "html")
 	  ;; TODO: convert HTML to Org markup.
 	  (setq entry (plist-put entry :description
-				 (org-feed-unescape
+				 (xml-substitute-special
 				  (car (xml-node-children content))))))
 	 ((string= type "xhtml")
 	  ;; TODO: convert XHTML to Org markup.