Style/FormatStringToken with flags/modifiers

[herwinw]

PoC code:

def foo
  puts format('%s %s', 'foo', 'bar')
  puts format('%-20s %s', 'foo', 'bar')
  puts format('%-20s %-30s', 'foo', 'bar')
end

---

Expected behavior

6 warnings of Style/FormatStringToken to prefer annotated tokens

Actual behavior

Only the %s items are detected. Any flag or modifier to the format string makes them unrecognized.

Steps to reproduce the problem

See PoC

RuboCop version

0.70.0 (using Parser 2.6.3.0, running on ruby 2.3.3 i386-linux-gnu)

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contribution and understanding!

[buehmann]

I am going to take a shot at generalizing my #7268 to cover this.