code: function getSize(value) {
      var defaultValue = $mdProgressCircular.progressSize;
  
      if (value) {
        var parsed = parseFloat(value);
  
        if (value.lastIndexOf('%') === value.length - 1) {
          parsed = (parsed / 100) * defaultValue;
        }
  
        return parsed;
      }
  
      return defaultValue;
    }
docs: Determines the size of a progress circle, based on the provided
  value in the following formats: `X`, `Ypx`, `Z%`.