Guard against nested percent literals

* lisp/progmodes/ruby-mode.el
(ruby-syntax-propertize-percent-literal):
Don't check the syntax status.
(ruby-syntax-propertize): Check it here.  And also guard against
being in a larger percent literal.

* test/automated/ruby-mode-tests.el
(ruby-no-nested-percent-literals): New test.

1 files changed, 8 insertions, 0 deletions

diff --git a/test/automated/ruby-mode-tests.el b/test/automated/ruby-mode-tests.el
index da8d77c5157..7073f7a04e2 100644
--- a/test/automated/ruby-mode-tests.el
+++ b/test/automated/ruby-mode-tests.el
@@ -461,6 +461,14 @@ VALUES-PLIST is a list with alternating index and value elements."
   (ruby-assert-face "%S{foo}" 4 nil)
   (ruby-assert-face "%R{foo}" 4 nil))
 
+(ert-deftest ruby-no-nested-percent-literals ()
+  (ruby-with-temp-buffer "a = %w[b %()]"
+    (syntax-propertize (point))
+    (should (null (nth 8 (syntax-ppss))))
+    (should (eq t (nth 3 (syntax-ppss (1- (point-max))))))
+    (search-backward "[")
+    (should (eq t (nth 3 (syntax-ppss))))))
+
 (ert-deftest ruby-add-log-current-method-examples ()
   (let ((pairs '(("foo" . "#foo")
                  ("C.foo" . ".foo")