class SyntaxTree::RegexpLiteral

def format(q)
  braces = ambiguous?(q) || include?(%r{/})
  if braces && include?(/[{}]/)
    q.group do
      q.text(beginning)
      q.format_each(parts)
      q.text(ending)
    end
  elsif braces
    q.group do
      q.text("%r{")
      if beginning == "/"
        # If we're changing from a forward slash to a %r{, then we can
        # replace any escaped forward slashes with regular forward slashes.
        parts.each do |part|
          if part.is_a?(TStringContent)
            q.text(part.value.gsub("\\/", "/"))
          else
            q.format(part)
          end
        end
      else
        q.format_each(parts)
      end
      q.text("}")
      q.text(options)
    end
  else
    q.group do
      q.text("/")
      q.format_each(parts)
      q.text("/")
      q.text(options)
    end
  end
end