@staticmethod
def _get_lib_files_by_alias(map_):
    """
        Get the librairy files by alias char defined.

        :param List[List[Char]] map_: The map to import
        """
    filename_by_alias = {}
    for row in map_:
        line = ''.join(row).rstrip()
        if line.startswith('%!'):
            pieces = line[2:].split(' ')
            filename = pieces[0]
            alias = pieces[1]
            filename_by_alias[alias] = filename
    return filename_by_alias
