symbian-qemu-0.9.1-12/python-2.6.1/Demo/newmetaclasses/Enum.py
author Mike Kinghan <mikek@symbian.org>
Fri, 19 Nov 2010 16:17:17 +0000
branchGCC_SURGE
changeset 131 aa939c1eee2f
parent 1 2fb8b9db1c86
permissions -rw-r--r--
Add configuration option to the base/rom extension to make the toolchain (ARMCC/GCCE) known to the preprocessor stage of romb build.
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"""Enumeration metaclass."""
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class EnumMetaclass(type):
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    """Metaclass for enumeration.
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    To define your own enumeration, do something like
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    class Color(Enum):
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        red = 1
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        green = 2
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        blue = 3
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    Now, Color.red, Color.green and Color.blue behave totally
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    different: they are enumerated values, not integers.
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    Enumerations cannot be instantiated; however they can be
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    subclassed.
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    """
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    def __init__(cls, name, bases, dict):
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        super(EnumMetaclass, cls).__init__(name, bases, dict)
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        cls._members = []
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        for attr in dict.keys():
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            if not (attr.startswith('__') and attr.endswith('__')):
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                enumval = EnumInstance(name, attr, dict[attr])
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                setattr(cls, attr, enumval)
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                cls._members.append(attr)
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    def __getattr__(cls, name):
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        if name == "__members__":
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            return cls._members
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        raise AttributeError, name
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    def __repr__(cls):
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        s1 = s2 = ""
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        enumbases = [base.__name__ for base in cls.__bases__
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                     if isinstance(base, EnumMetaclass) and not base is Enum]
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        if enumbases:
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            s1 = "(%s)" % ", ".join(enumbases)
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        enumvalues = ["%s: %d" % (val, getattr(cls, val))
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                      for val in cls._members]
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        if enumvalues:
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            s2 = ": {%s}" % ", ".join(enumvalues)
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        return "%s%s%s" % (cls.__name__, s1, s2)
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class FullEnumMetaclass(EnumMetaclass):
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    """Metaclass for full enumerations.
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    A full enumeration displays all the values defined in base classes.
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    """
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    def __init__(cls, name, bases, dict):
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        super(FullEnumMetaclass, cls).__init__(name, bases, dict)
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        for obj in cls.__mro__:
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            if isinstance(obj, EnumMetaclass):
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                for attr in obj._members:
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                    # XXX inefficient
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                    if not attr in cls._members:
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                        cls._members.append(attr)
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class EnumInstance(int):
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    """Class to represent an enumeration value.
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    EnumInstance('Color', 'red', 12) prints as 'Color.red' and behaves
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    like the integer 12 when compared, but doesn't support arithmetic.
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    XXX Should it record the actual enumeration rather than just its
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    name?
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    """
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    def __new__(cls, classname, enumname, value):
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        return int.__new__(cls, value)
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    def __init__(self, classname, enumname, value):
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        self.__classname = classname
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        self.__enumname = enumname
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    def __repr__(self):
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        return "EnumInstance(%s, %s, %d)" % (self.__classname, self.__enumname,
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                                             self)
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    def __str__(self):
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        return "%s.%s" % (self.__classname, self.__enumname)
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class Enum:
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    __metaclass__ = EnumMetaclass
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class FullEnum:
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    __metaclass__ = FullEnumMetaclass
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def _test():
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    class Color(Enum):
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        red = 1
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        green = 2
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        blue = 3
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    print Color.red
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    print repr(Color.red)
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    print Color.red == Color.red
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    print Color.red == Color.blue
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    print Color.red == 1
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    print Color.red == 2
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    class ExtendedColor(Color):
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        white = 0
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        orange = 4
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        yellow = 5
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        purple = 6
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        black = 7
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    print ExtendedColor.orange
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    print ExtendedColor.red
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    print Color.red == ExtendedColor.red
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    class OtherColor(Enum):
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        white = 4
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        blue = 5
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    class MergedColor(Color, OtherColor):
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        pass
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    print MergedColor.red
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    print MergedColor.white
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    print Color
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    print ExtendedColor
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    print OtherColor
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    print MergedColor
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def _test2():
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    class Color(FullEnum):
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        red = 1
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        green = 2
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        blue = 3
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    print Color.red
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    print repr(Color.red)
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    print Color.red == Color.red
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    print Color.red == Color.blue
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    print Color.red == 1
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    print Color.red == 2
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    class ExtendedColor(Color):
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        white = 0
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        orange = 4
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        yellow = 5
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        purple = 6
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        black = 7
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    print ExtendedColor.orange
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    print ExtendedColor.red
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    print Color.red == ExtendedColor.red
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    class OtherColor(FullEnum):
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        white = 4
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        blue = 5
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    class MergedColor(Color, OtherColor):
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        pass
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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    print MergedColor.red
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    print MergedColor.white
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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    print Color
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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    print ExtendedColor
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    print OtherColor
2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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   173
    print MergedColor
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2fb8b9db1c86 Initial QEMU (symbian-qemu-0.9.1-12) import
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if __name__ == '__main__':
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    _test()
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    _test2()