Style/RedundantParentheses makes wrong ternary autocorrection

[garettarrowood]

While cleaning up a large codebase, I stumbled upon the autocorrection plunder below.

---

Expected behavior

Style/RedundantParentheses should autocorrect this line of code:

(user.active)? "Y" : "N"

to

user.active ? "Y" : "N"

Actual behavior

However, what actually happens is that the necessary whitespace is not added. And non-executable code is produced in place of the ternary.

-  (user.active)? "Y" : "N"
+  user.active? "Y" : "N"

Attempting to execute the corrected line (where active? is also a defined method):

SyntaxError: unexpected ':', expecting end-of-input

Steps to reproduce the problem

Run rubocop autocorrection on this snippet to produce the results described above.

(user.active)? "Y" : "N"

RuboCop version

0.51.0 (using Parser 2.4.0.0, running on ruby 2.3.3 x86_64-darwin15)

[tiagotex]

I'm working on a fix for this bug.