class Nokogiri::CSS::Parser

def _reduce_45(val, _values, result) 

def _reduce_45(val, _values, result)
               # n+3, -n+3
        if val[0] == 'n'
          val.unshift("1")
          result = Node.new(:AN_PLUS_B, val)
        elsif val[0] == '-n'
          val[0] = 'n'
          val.unshift("-1")
          result = Node.new(:AN_PLUS_B, val)
        else
          raise Racc::ParseError, "parse error on IDENT '#{val[1]}'"
        end
      
    result
end