Fix problem in HTML with bracketed characters

* lisp/textmodes/sgml-mode.el (sgml-tag-syntax-table): Use bracket
syntax for all Unicode bracket characters (bug#43941).

2 files changed, 40 insertions, 2 deletions

diff --git a/lisp/textmodes/sgml-mode.el b/lisp/textmodes/sgml-mode.el
index d5930e82df3..fda00ec367e 100644
--- a/lisp/textmodes/sgml-mode.el
+++ b/lisp/textmodes/sgml-mode.el
@@ -190,8 +190,19 @@ This takes effect when first loading the `sgml-mode' library.")
   "Syntax table used in SGML mode.  See also `sgml-specials'.")
 
 (defconst sgml-tag-syntax-table
-  (let ((table (sgml-make-syntax-table sgml-specials)))
-    (dolist (char '(?\( ?\) ?\{ ?\} ?\[ ?\] ?$ ?% ?& ?* ?+ ?/))
+  (let ((table (sgml-make-syntax-table sgml-specials))
+        brackets)
+    (map-char-table
+     (lambda (key value)
+       (setq brackets (cons (list
+                             (if (consp key)
+                                 (list (car key) (cdr key))
+                               key)
+                             value)
+                            brackets)))
+     (unicode-property-table-internal 'paired-bracket))
+    (setq brackets (delete-dups (flatten-tree brackets)))
+    (dolist (char (append brackets (list ?$ ?% ?& ?* ?+ ?/)))
       (modify-syntax-entry char "." table))
     (unless (memq ?' sgml-specials)
       ;; Avoid that skipping a tag backwards skips any "'" prefixing it.
diff --git a/test/lisp/textmodes/sgml-mode-tests.el b/test/lisp/textmodes/sgml-mode-tests.el
index 697c96c78e5..39d44e8f683 100644
--- a/test/lisp/textmodes/sgml-mode-tests.el
+++ b/test/lisp/textmodes/sgml-mode-tests.el
@@ -204,5 +204,32 @@ The point is set to the beginning of the buffer."
     (should (= 1 (- (car (syntax-ppss (1- (point-max))))
                     (car (syntax-ppss (point-max))))))))
 
+(ert-deftest sgml-test-brackets ()
+  "Test fontification of apostrophe preceded by paired-bracket character."
+  (let (brackets results)
+    (map-char-table
+     (lambda (key value)
+       (setq brackets (cons (list
+                             (if (consp key)
+                                 (list (car key) (cdr key))
+                               key)
+                             value)
+                            brackets)))
+     (unicode-property-table-internal 'paired-bracket))
+    (setq brackets (delete-dups (flatten-tree brackets)))
+    (setq brackets (append brackets (list ?$ ?% ?& ?* ?+ ?/)))
+    (with-temp-buffer
+      (while brackets
+        (let ((char (string (pop brackets))))
+          (insert (concat "<p>" char "'s</p>\n"))))
+      (html-mode)
+      (font-lock-ensure (point-min) (point-max))
+      (goto-char (point-min))
+      (while (not (eobp))
+        (goto-char (next-single-char-property-change (point) 'face))
+        (let ((val (get-text-property (point) 'face)))
+          (when val
+            (should-not (eq val 'font-lock-string-face))))))))
+
 (provide 'sgml-mode-tests)
 ;;; sgml-mode-tests.el ends here