ruby-mode: Better detect regexp vs division (bug#67569)

* lisp/progmodes/ruby-mode.el (ruby-syntax-before-regexp-re):
Add grouping around methods from the whitelist.
(ruby-syntax-propertize): Also look for spaces around the slash.

1 files changed, 12 insertions, 0 deletions

diff --git a/test/lisp/progmodes/ruby-mode-tests.el b/test/lisp/progmodes/ruby-mode-tests.el
index 117385ea3e8..a931541ba35 100644
--- a/test/lisp/progmodes/ruby-mode-tests.el
+++ b/test/lisp/progmodes/ruby-mode-tests.el
@@ -157,6 +157,18 @@ VALUES-PLIST is a list with alternating index and value elements."
 (ert-deftest ruby-regexp-is-not-mistaken-for-slash-symbol ()
   (ruby-assert-state "x = /foo:/" 3 nil))
 
+(ert-deftest ruby-slash-not-regexp-when-surrounded-by-spaces ()
+  (ruby-assert-state "x = index / 3" 3 nil))
+
+(ert-deftest ruby-slash-not-regexp-when-no-spaces ()
+  (ruby-assert-state "x = index/3" 3 nil))
+
+(ert-deftest ruby-regexp-not-division-when-only-space-before ()
+  (ruby-assert-state "x = index /3" 3 ?/))
+
+(ert-deftest ruby-slash-not-regexp-when-only-space-after ()
+  (ruby-assert-state "x = index/ 3" 3 nil))
+
 (ert-deftest ruby-indent-simple ()
   (ruby-should-indent-buffer
    "if foo