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authorOri Bernstein <ori@eigenstate.org>2021-06-14 00:00:37 +0000
committerOri Bernstein <ori@eigenstate.org>2021-06-14 00:00:37 +0000
commita73a964e51247ed169d322c725a3a18859f109a3 (patch)
tree3f752d117274d444bda44e85609aeac1acf313f3 /sys/src/cmd/python/Demo/metaclasses/Meta.py
parente64efe273fcb921a61bf27d33b230c4e64fcd425 (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.py118
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()