EmbeddedPkg: Extend NvVarStoreFormattedLib LIBRARY_CLASS

[mirror_edk2.git] / AppPkg / Applications / Python / Python-2.7.2 / Demo / newmetaclasses / Enum.py

"""Enumeration metaclass."""\r
\r
class EnumMetaclass(type):\r
    """Metaclass for enumeration.\r
\r
    To define your own enumeration, do something like\r
\r
    class Color(Enum):\r
        red = 1\r
        green = 2\r
        blue = 3\r
\r
    Now, Color.red, Color.green and Color.blue behave totally\r
    different: they are enumerated values, not integers.\r
\r
    Enumerations cannot be instantiated; however they can be\r
    subclassed.\r
    """\r
\r
    def __init__(cls, name, bases, dict):\r
        super(EnumMetaclass, cls).__init__(name, bases, dict)\r
        cls._members = []\r
        for attr in dict.keys():\r
            if not (attr.startswith('__') and attr.endswith('__')):\r
                enumval = EnumInstance(name, attr, dict[attr])\r
                setattr(cls, attr, enumval)\r
                cls._members.append(attr)\r
\r
    def __getattr__(cls, name):\r
        if name == "__members__":\r
            return cls._members\r
        raise AttributeError, name\r
\r
    def __repr__(cls):\r
        s1 = s2 = ""\r
        enumbases = [base.__name__ for base in cls.__bases__\r
                     if isinstance(base, EnumMetaclass) and not base is Enum]\r
        if enumbases:\r
            s1 = "(%s)" % ", ".join(enumbases)\r
        enumvalues = ["%s: %d" % (val, getattr(cls, val))\r
                      for val in cls._members]\r
        if enumvalues:\r
            s2 = ": {%s}" % ", ".join(enumvalues)\r
        return "%s%s%s" % (cls.__name__, s1, s2)\r
\r
class FullEnumMetaclass(EnumMetaclass):\r
    """Metaclass for full enumerations.\r
\r
    A full enumeration displays all the values defined in base classes.\r
    """\r
\r
    def __init__(cls, name, bases, dict):\r
        super(FullEnumMetaclass, cls).__init__(name, bases, dict)\r
        for obj in cls.__mro__:\r
            if isinstance(obj, EnumMetaclass):\r
                for attr in obj._members:\r
                    # XXX inefficient\r
                    if not attr in cls._members:\r
                        cls._members.append(attr)\r
\r
class EnumInstance(int):\r
    """Class to represent an enumeration value.\r
\r
    EnumInstance('Color', 'red', 12) prints as 'Color.red' and behaves\r
    like the integer 12 when compared, but doesn't support arithmetic.\r
\r
    XXX Should it record the actual enumeration rather than just its\r
    name?\r
    """\r
\r
    def __new__(cls, classname, enumname, value):\r
        return int.__new__(cls, value)\r
\r
    def __init__(self, classname, enumname, value):\r
        self.__classname = classname\r
        self.__enumname = enumname\r
\r
    def __repr__(self):\r
        return "EnumInstance(%s, %s, %d)" % (self.__classname, self.__enumname,\r
                                             self)\r
\r
    def __str__(self):\r
        return "%s.%s" % (self.__classname, self.__enumname)\r
\r
class Enum:\r
    __metaclass__ = EnumMetaclass\r
\r
class FullEnum:\r
    __metaclass__ = FullEnumMetaclass\r
\r
def _test():\r
\r
    class Color(Enum):\r
        red = 1\r
        green = 2\r
        blue = 3\r
\r
    print Color.red\r
\r
    print repr(Color.red)\r
    print Color.red == Color.red\r
    print Color.red == Color.blue\r
    print Color.red == 1\r
    print Color.red == 2\r
\r
    class ExtendedColor(Color):\r
        white = 0\r
        orange = 4\r
        yellow = 5\r
        purple = 6\r
        black = 7\r
\r
    print ExtendedColor.orange\r
    print ExtendedColor.red\r
\r
    print Color.red == ExtendedColor.red\r
\r
    class OtherColor(Enum):\r
        white = 4\r
        blue = 5\r
\r
    class MergedColor(Color, OtherColor):\r
        pass\r
\r
    print MergedColor.red\r
    print MergedColor.white\r
\r
    print Color\r
    print ExtendedColor\r
    print OtherColor\r
    print MergedColor\r
\r
def _test2():\r
\r
    class Color(FullEnum):\r
        red = 1\r
        green = 2\r
        blue = 3\r
\r
    print Color.red\r
\r
    print repr(Color.red)\r
    print Color.red == Color.red\r
    print Color.red == Color.blue\r
    print Color.red == 1\r
    print Color.red == 2\r
\r
    class ExtendedColor(Color):\r
        white = 0\r
        orange = 4\r
        yellow = 5\r
        purple = 6\r
        black = 7\r
\r
    print ExtendedColor.orange\r
    print ExtendedColor.red\r
\r
    print Color.red == ExtendedColor.red\r
\r
    class OtherColor(FullEnum):\r
        white = 4\r
        blue = 5\r
\r
    class MergedColor(Color, OtherColor):\r
        pass\r
\r
    print MergedColor.red\r
    print MergedColor.white\r
\r
    print Color\r
    print ExtendedColor\r
    print OtherColor\r
    print MergedColor\r
\r
if __name__ == '__main__':\r
    _test()\r
    _test2()\r