code: function(input) {
          var state = this.state;
          var eventType = input.eventType;
  
          var isRecognized = state & (STATE_BEGAN | STATE_CHANGED);
          var isValid = this.attrTest(input);
  
          // on cancel input and we've recognized before, return STATE_CANCELLED
          if (isRecognized && (eventType & INPUT_CANCEL || !isValid)) {
              return state | STATE_CANCELLED;
          } else if (isRecognized || isValid) {
              if (eventType & INPUT_END) {
                  return state | STATE_ENDED;
              } else if (!(state & STATE_BEGAN)) {
                  return STATE_BEGAN;
              }
              return state | STATE_CHANGED;
          }
          return STATE_FAILED;
      }
docs: Process the input and return the state for the recognizer
  @memberof AttrRecognizer
  @param {Object} input
  @returns {*} State