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Edit File : Meta.py \| Size : 2.86 KB
"""Generic metaclass. XXX This is very much a work in progress. """ import types class MetaMethodWrapper: def __init__(self, func, inst): self.func = func self.inst = inst self.__name__ = self.func.__name__ def __call__(self, args, kw): return apply(self.func, (self.inst,) + args, kw) class MetaHelper: __methodwrapper__ = MetaMethodWrapper # For derived helpers to override def __helperinit__(self, formalclass): self.__formalclass__ = formalclass def __getattr__(self, name): # Invoked for any attr not in the instance's __dict__ try: raw = self.__formalclass__.__getattr__(name) except AttributeError: try: ga = self.__formalclass__.__getattr__('__usergetattr__') except (KeyError, AttributeError): raise AttributeError, name return ga(self, name) if type(raw) != types.FunctionType: return raw return self.__methodwrapper__(raw, self) class MetaClass: """A generic metaclass. This can be subclassed to implement various kinds of meta-behavior. """ __helper__ = MetaHelper # For derived metaclasses to override __inited = 0 def __init__(self, name, bases, dict): try: ga = dict['__getattr__'] except KeyError: pass else: dict['__usergetattr__'] = ga del dict['__getattr__'] self.__name__ = name self.__bases__ = bases self.__realdict__ = dict self.__inited = 1 def __getattr__(self, name): try: return self.__realdict__[name] except KeyError: for base in self.__bases__: try: return base.__getattr__(name) except AttributeError: pass raise AttributeError, name def __setattr__(self, name, value): if not self.__inited: self.__dict__[name] = value else: self.__realdict__[name] = value def __call__(self, args, *kw): inst = self.__helper__() inst.__helperinit__(self) try: init = inst.__getattr__('__init__') except AttributeError: init = lambda: None apply(init, args, kw) return inst Meta = MetaClass('Meta', (), {}) def _test(): class C(Meta): def __init__(self, args): print "__init__, args =", args def m1(self, x): print "m1(x=%r)" % (x,) print C x = C() print x x.m1(12) class D(C): def __getattr__(self, name): if name[:2] == '__': raise AttributeError, name return "getattr:%s" % name x = D() print x.foo print x._foo ## print x.__foo ## print x.__foo__ if __name__ == '__main__': _test() Back

Edit File : Meta.py | Size : 2.86 KB

"""Generic metaclass.

XXX This is very much a work in progress.

"""

import types

class MetaMethodWrapper:

def __init__(self, func, inst):
        self.func = func
        self.inst = inst
        self.__name__ = self.func.__name__

def __call__(self, *args, **kw):
        return apply(self.func, (self.inst,) + args, kw)

class MetaHelper:

__methodwrapper__ = MetaMethodWrapper # For derived helpers to override

def __helperinit__(self, formalclass):
        self.__formalclass__ = formalclass

def __getattr__(self, name):
        # Invoked for any attr not in the instance's __dict__
        try:
            raw = self.__formalclass__.__getattr__(name)
        except AttributeError:
            try:
                ga = self.__formalclass__.__getattr__('__usergetattr__')
            except (KeyError, AttributeError):
                raise AttributeError, name
            return ga(self, name)
        if type(raw) != types.FunctionType:
            return raw
        return self.__methodwrapper__(raw, self)

class MetaClass:

"""A generic metaclass.

This can be subclassed to implement various kinds of meta-behavior.

"""

__helper__ = MetaHelper             # For derived metaclasses to override

__inited = 0

def __init__(self, name, bases, dict):
        try:
            ga = dict['__getattr__']
        except KeyError:
            pass
        else:
            dict['__usergetattr__'] = ga
            del dict['__getattr__']
        self.__name__ = name
        self.__bases__ = bases
        self.__realdict__ = dict
        self.__inited = 1

def __getattr__(self, name):
        try:
            return self.__realdict__[name]
        except KeyError:
            for base in self.__bases__:
                try:
                    return base.__getattr__(name)
                except AttributeError:
                    pass
            raise AttributeError, name

def __setattr__(self, name, value):
        if not self.__inited:
            self.__dict__[name] = value
        else:
            self.__realdict__[name] = value

def __call__(self, *args, **kw):
        inst = self.__helper__()
        inst.__helperinit__(self)
        try:
            init = inst.__getattr__('__init__')
        except AttributeError:
            init = lambda: None
        apply(init, args, kw)
        return inst

Meta = MetaClass('Meta', (), {})

def _test():
    class C(Meta):
        def __init__(self, *args):
            print "__init__, args =", args
        def m1(self, x):
            print "m1(x=%r)" % (x,)
    print C
    x = C()
    print x
    x.m1(12)
    class D(C):
        def __getattr__(self, name):
            if name[:2] == '__': raise AttributeError, name
            return "getattr:%s" % name
    x = D()
    print x.foo
    print x._foo
##     print x.__foo
##     print x.__foo__

if __name__ == '__main__':
    _test()

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