code: def toFilter(self, property):
          
          if self.leftedge == self.rightedge and self.leftop is ge and self.rightop is le:
              # equivalent to ==
              return Filter(style.SelectorAttributeTest(property, '=', self.leftedge))
      
          try:
              return Filter(style.SelectorAttributeTest(property, opstr[self.leftop], self.leftedge),
                            style.SelectorAttributeTest(property, opstr[self.rightop], self.rightedge))
          except KeyError:
              try:
                  return Filter(style.SelectorAttributeTest(property, opstr[self.rightop], self.rightedge))
              except KeyError:
                  try:
                      return Filter(style.SelectorAttributeTest(property, opstr[self.leftop], self.leftedge))
                  except KeyError:
                      return Filter()
docs: Convert this range to a Filter with a tests having a given property.