docs: def GetHashType(self, hash_str):
      """Identify the type of hash in a hash string.
  
      Args:
        hash_str: A string value that may be a hash.
  
      Returns:
        A string description of the type of hash.
      """
      # Return the type of the first matching hash.
      for hash_type, hash_re in self.hashes:
        if hash_re.match(hash_str):
          return hash_type
      # No hash matched.
      return "EMPTY"