Tiny bug in scala lexer

[htch]

Stumbled upon a small wart in scala lexer: it treats closing parenthesis as a part of a preceding scala symbol, for example in this code sample:

StorageState.table(StorageState.NewUsers()).format(
  keyParams('app_id).asInstanceOf[String],
  keyParams('platform).asInstanceOf[String],
  keyParams('version).asInstanceOf[String],
  keyParams('scale).asInstanceOf[String],
  formattedToday
)

Relevant screenshot of the same code from gitlab that relies on rouge for its syntax highlighting and a paste in the rouge pastebin.

[stale]

This issue has been automatically marked as stale because it has not had any activity for more than a year. It will be closed if no additional activity occurs within the next 14 days.
If you would like this issue to remain open, please reply and let us know if the issue is still reproducible.

[anthony-cros]

This is still an issue as of today (the closing brackets is colored improperly), at least as used from Jekyll

[pyrmont]

Pretty sure the [^'] is the bug:

rouge/lib/rouge/lexers/scala.rb

Line 43 in 20da651

rule %r/'#{idrest}[^']/, Str::Symbol

I'm guessing that it's there to avoid matching against single-quoted strings but should probably be a negative lookahead.