scan

# File actionpack/lib/action_dispatch/journey/scanner.rb, line 35
        def scan
          case
            # /
          when text = @ss.scan(/\//)
            [:SLASH, text]
          when text = @ss.scan(/\*\w+/)
            [:STAR, text]
          when text = @ss.scan(/\(/)
            [:LPAREN, text]
          when text = @ss.scan(/\)/)
            [:RPAREN, text]
          when text = @ss.scan(/\|/)
            [:OR, text]
          when text = @ss.scan(/\./)
            [:DOT, text]
          when text = @ss.scan(/:\w+/)
            [:SYMBOL, text]
          when text = @ss.scan(/[\w%\-~]+/)
            [:LITERAL, text]
            # any char
          when text = @ss.scan(/./)
            [:LITERAL, text]
          end
        end