class REXML::XPathParser

def compare(a, operator, b)
  a, b = normalize_compare_values(a, operator, b)
  case operator
  when :eq
    a == b
  when :neq
    a != b
  when :lt
    a < b
  when :lteq
    a <= b
  when :gt
    a > b
  when :gteq
    a >= b
  else
    message = "[BUG] Unexpected compare operator: " +
      "<#{operator.inspect}>: <#{a.inspect}>: <#{b.inspect}>"
    raise message
  end
end