diff options
author | Ori Bernstein <ori@eigenstate.org> | 2021-06-14 00:00:37 +0000 |
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committer | Ori Bernstein <ori@eigenstate.org> | 2021-06-14 00:00:37 +0000 |
commit | a73a964e51247ed169d322c725a3a18859f109a3 (patch) | |
tree | 3f752d117274d444bda44e85609aeac1acf313f3 /sys/src/cmd/python/Demo/metaclasses/Meta.py | |
parent | e64efe273fcb921a61bf27d33b230c4e64fcd425 (diff) |
python, hg: tow outside the environment.
they've served us well, and can ride off into the sunset.
Diffstat (limited to 'sys/src/cmd/python/Demo/metaclasses/Meta.py')
-rw-r--r-- | sys/src/cmd/python/Demo/metaclasses/Meta.py | 118 |
1 files changed, 0 insertions, 118 deletions
diff --git a/sys/src/cmd/python/Demo/metaclasses/Meta.py b/sys/src/cmd/python/Demo/metaclasses/Meta.py deleted file mode 100644 index 580f5821c..000000000 --- a/sys/src/cmd/python/Demo/metaclasses/Meta.py +++ /dev/null @@ -1,118 +0,0 @@ -"""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() |