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File Name : Meta.py

"""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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Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2019-09-26 01:52:52
..	dir	-	root/root	0755	2019-09-26 01:52:52
Eiffel.py	file	3.39 KB	root/root	0644	2013-05-12 03:32:38
Eiffel.pyc	file	4.52 KB	root/root	0644	2019-08-07 12:52:03
Eiffel.pyo	file	4.42 KB	root/root	0644	2019-08-07 12:52:05
Enum.py	file	4.32 KB	root/root	0644	2013-05-12 03:32:38
Enum.pyc	file	6.03 KB	root/root	0644	2019-08-07 12:52:03
Enum.pyo	file	6.03 KB	root/root	0644	2019-08-07 12:52:03
Meta.py	file	2.86 KB	root/root	0644	2013-05-12 03:32:38
Meta.pyc	file	4.47 KB	root/root	0644	2019-08-07 12:52:03
Meta.pyo	file	4.47 KB	root/root	0644	2019-08-07 12:52:03
Simple.py	file	1.16 KB	root/root	0644	2013-05-12 03:32:38
Simple.pyc	file	2.68 KB	root/root	0644	2019-08-07 12:52:03
Simple.pyo	file	2.68 KB	root/root	0644	2019-08-07 12:52:03
Synch.py	file	7.75 KB	root/root	0644	2013-05-12 03:32:38
Synch.pyc	file	8.26 KB	root/root	0644	2019-08-07 12:52:03
Synch.pyo	file	8.12 KB	root/root	0644	2019-08-07 12:52:05
Trace.py	file	4.04 KB	root/root	0644	2013-05-12 03:32:38
Trace.pyc	file	6.03 KB	root/root	0644	2019-08-07 12:52:03
Trace.pyo	file	6.03 KB	root/root	0644	2019-08-07 12:52:03
index.html	file	20.09 KB	root/root	0644	2013-05-12 03:32:38
meta-vladimir.txt	file	11.26 KB	root/root	0644	2013-05-12 03:32:38