Re: General delimited literals in ruby-mode patch

[Dmitry Gutov]

>> The bug: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=6286.

And here's a tentative patch for the last example (regexp as a first
parameter in a paren-less method invocation).

It adds a check whether the regexp is followed by a comma or a
block, though, so the full example should look like this:

Given /A user is logged in/ do
  # whatever
end

AFAIK, all Cucumber step definitions need a block (that's where the
definition goes), so it shouldn't be a problem.

diff --git a/lisp/progmodes/ruby-mode.el b/lisp/progmodes/ruby-mode.el
index e93f8b3..a0a6509 100644
--- a/lisp/progmodes/ruby-mode.el
+++ b/lisp/progmodes/ruby-mode.el
@@ -1130,9 +1130,8 @@ See `add-log-current-defun-function'."
                         (nth 3 (syntax-ppss (match-beginning 0))))
                 (string-to-syntax "\\"))))
           ;; regexps
-          ("\\(^\\|[[=(,~?:;<>]\\|\\(^\\|\\s 
\\)\\(if\\|elsif\\|unless\\|while\\|until\\|when\\|and\\|or\\|&&\\|||\\)\\|g?sub!?\\|scan\\|split!?\\)\\s
 *\\(/\\)[^/\n\\\\]*\\(\\\\.[^/\n\\\\]*\\)*\\(/\\)"
-           (4 "\"/")
-           (6 "\"/"))
+          ("\\(^\\|[[=(,~?:;<>]\\|\\(?:^\\|\\s 
\\)\\(?:if\\|elsif\\|unless\\|while\\|until\\|when\\|and\\|or\\|&&\\|||\\)\\|g?sub!?\\|scan\\|split!?\\)?\\s
 *\\(/\\)[^/\n\\\\]*\\(?:\\\\.[^/\n\\\\]*\\)*\\(/\\)"
+           (2 (ruby-syntax-propertize-regexp)))
           ("^=en\\(d\\)\\_>" (1 "!"))
           ("^\\(=\\)begin\\_>" (1 "!"))
           ;; Handle here documents.
@@ -1143,6 +1142,21 @@ See `add-log-current-defun-function'."
            (1 (prog1 "|" (ruby-syntax-propertize-general-delimiters end)))))
          (point) end))
 
+      (defun ruby-syntax-propertize-regexp ()
+        (let ((syn (string-to-syntax "\"/")))
+          (goto-char (match-end 3))
+          (if (or
+               ;; after paren, comma, operator, control flow keyword,
+               ;; or a method from hardcoded list
+               (match-beginning 1)
+               ;; followed by comma or block
+               (looking-at "[imxo]*\\s *\\(?:,\\|\\<do\\>\\)"))
+              (progn
+                (put-text-property (1- (point)) (point)
+                                   'syntax-table syn)
+                syn)
+            (goto-char (match-end 2)))))
+
       (defun ruby-syntax-propertize-heredoc (limit)
         (let ((ppss (syntax-ppss))
               (res '()))