class Nokogiri::CSS::Parser

def _reduce_43(val, _values, result)
        if val[0] == 'even'
          val = ["2","n","+","0"]
          result = Node.new(:AN_PLUS_B, val)
        elsif val[0] == 'odd'
          val = ["2","n","+","1"]
          result = Node.new(:AN_PLUS_B, val)
        else
          # This is not CSS standard.  It allows us to support this:
          # assert_xpath("//a[foo(., @href)]", @parser.parse('a:foo(@href)'))
          # assert_xpath("//a[foo(., @a, b)]", @parser.parse('a:foo(@a, b)'))
          # assert_xpath("//a[foo(., a, 10)]", @parser.parse('a:foo(a, 10)'))
          result = val
        end
      
    result
end