code: def _GetNameFromProduct(self):
      
      product = self.product or ''
      product = product.split(' ')
      product_lower_case = [segment.lower() for segment in product]
      number_of_segments = len(product)
  
      if 'windows' in product_lower_case:
        segment_index = product_lower_case.index('windows') + 1
        if product_lower_case[segment_index] in ('(r)', 'server'):
          segment_index += 1
  
        # Check if the version has a suffix.
        suffix_segment_index = segment_index + 1
        if (suffix_segment_index < number_of_segments and
            product_lower_case[suffix_segment_index] == 'r2'):
          return 'Windows {0:s} R2'.format(product[segment_index])
  
        return 'Windows {0:s}'.format(product[segment_index])
  
      return None
docs: Determines the predefined operating system name from the product.
  
      Returns:
        str: operating system name, such as "macOS Mojave" or "Windows XP" or
            None if the name cannot be determined. This value is used to
            programmatically link a parser preset to an operating system and
            therefore must be one of predefined values.