IL2HorusTeam / il2fb-commons

        raise ValueError("Regiment with code name '{0}' is unknown"

                         .format(code_name))

    @classmethod

    def filter_by_air_force(cls, air_force):

        result = []

        flight_prefixes = AirForces.get_flight_prefixes()

        found = False

        file_path = _get_data_file_path(cls._file_name)

        with open(file_path, mode='r', encoding='cp1251') as f:

            for line in f:

                line = line.strip()

                if not line:

                    continue

                if line == air_force.default_flight_prefix:

                    # Flag that proper section was found.

                    found = True

                    continue

                if found:

                    if (

                        line in flight_prefixes

                        or (line.startswith('[') and line.endswith(']'))

                    ):

                        # Next section was found. Fullstop.

                        break

                    if line in cls._cache:

                        regiment = cls._cache[line]

                    else:

                        regiment = Regiment(air_force, line)

                        cls._cache[line] = regiment

                    result.append(regiment)

        return result

    def __new__(cls):

        raise TypeError("'{0}' may not be instantiated".format(cls.__name__))

    @classmethod

    def get_by_code_name(cls, code_name):

        if code_name in cls._cache:

            return cls._cache[code_name]

        flight_prefixes = AirForces.get_flight_prefixes()

        last_flight_prefix = None

        found = False

        file_path = _get_data_file_path(cls._file_name)

        with open(file_path, mode='r', encoding='cp1251') as f:

            for line in f:

                line = line.strip()

                if not line:

                    continue

                if line in flight_prefixes:

                    last_flight_prefix = line

                    continue

                if line == code_name:

                    found = True

                    break

        if found and last_flight_prefix:

            air_force = AirForces.get_by_flight_prefix(last_flight_prefix)

            regiment = Regiment(air_force, code_name)

            cls._cache[code_name] = regiment

            return regiment

        raise ValueError("Regiment with code name '{0}' is unknown"

                         .format(code_name))

    @classmethod