ispell.el: Add `ispell-looking-back' XEmacs compatibility function for `looking-back'

flyspell.el (sgml-mode-flyspell-verify): Use `ispell-looking-back'

2 files changed, 20 insertions, 4 deletions

diff --git a/lisp/textmodes/flyspell.el b/lisp/textmodes/flyspell.el
index d2cf0ba3877..f3a15b2c5cc 100644
--- a/lisp/textmodes/flyspell.el
+++ b/lisp/textmodes/flyspell.el
@@ -363,9 +363,9 @@ property of the major mode name.")
   "Function used for `flyspell-generic-check-word-predicate' in SGML mode."
   (not (save-excursion
          (or (looking-at "[^<\n]*>")
-             (looking-back "<[^>\n]*")
+             (ispell-looking-back "<[^>\n]*")
              (and (looking-at "[^&\n]*;")
-                  (looking-back "&[^;\n]*"))))))
+                  (ispell-looking-back "&[^;\n]*"))))))
 
 ;;*---------------------------------------------------------------------*/
 ;;*    Programming mode                                                 */
diff --git a/lisp/textmodes/ispell.el b/lisp/textmodes/ispell.el
index 2f7b2e68fbd..86e663fed68 100644
--- a/lisp/textmodes/ispell.el
+++ b/lisp/textmodes/ispell.el
@@ -196,12 +196,13 @@
 ;; Improved message reference matching in `ispell-message'.
 ;; Fixed bug in returning to nroff mode from tex mode.
 
-;;; Compatibility code for xemacs and (not too) older emacsen:
+;;; Compatibility code for XEmacs and (not too) older emacsen:
 
-(eval-and-compile ;; Protect against declare-function undefined in xemacs
+(eval-and-compile ;; Protect against declare-function undefined in XEmacs
   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
 
 (declare-function ispell-check-minver "ispell" (v1 v2))
+(declare-function ispell-looking-back "ispell" (regexp &optional limit))
 
 (if (fboundp 'version<=)
     (defalias 'ispell-check-minver 'version<=)
@@ -238,6 +239,21 @@ compatibility function in case `version<=' is not available."
             (setq pending nil))))
       return)))
 
+;; XEmacs does not have looking-back
+(if (fboundp 'looking-back)
+    (defalias 'ispell-looking-back 'looking-back)
+  (defun ispell-looking-back (regexp &optional limit &rest ignored)
+    "Return non-nil if text before point matches regular expression REGEXP.
+Like `looking-at' except matches before point, and is slower.
+LIMIT if non-nil speeds up the search by specifying a minimum
+starting position, to avoid checking matches that would start
+before LIMIT.
+
+This is a stripped down compatibility function for use when
+full featured `looking-back' function is missing."
+    (save-excursion
+      (re-search-backward (concat "\\(?:" regexp "\\)\\=") limit t))))
+
 ;;; Code:
 
 (defvar mail-yank-prefix)