class AttrWalker(object):
def __init__(self):
self.applymm = MultiMethod(lambda *a, **kw: (a[1], ))
self.createmm = MultiMethod(lambda *a, **kw: (a[1], ))
def add_creator(self, *types):
def _dec(fun):
for type_ in types:
self.createmm.add(fun, (type_, ))
return fun
return _dec
def add_applier(self, *types):
def _dec(fun):
for type_ in types:
self.applymm.add(fun, (type_, ))
return fun
return _dec
def add_converter(self, *types):
def _dec(fun):
for type_ in types:
self.applymm.add(self.cv_apply(fun), (type_, ))
self.createmm.add(self.cv_create(fun), (type_, ))
return fun
return _dec
def cv_apply(self, fun):
def _fun(*args, **kwargs):
args = list(args)
args[1] = fun(args[1])
return self.applymm(*args, **kwargs)
return _fun
def cv_create(self, fun):
def _fun(*args, **kwargs):
args = list(args)
args[1] = fun(args[1])
return self.createmm(*args, **kwargs)
return _fun
def create(self, *args, **kwargs):
return self.createmm(self, *args, **kwargs)
def apply(self, *args, **kwargs):
return self.applymm(self, *args, **kwargs)
def super_create(self, *args, **kwargs):
return self.createmm.super(self, *args, **kwargs)
def super_apply(self, *args, **kwargs):
return self.applymm.super(self, *args, **kwargs)
class AttrWalker(object):
def __init__(self):
self.applymm = MultiMethod(lambda *a, **kw: (a[1],))
self.createmm = MultiMethod(lambda *a, **kw: (a[1],))
def add_creator(self, *types):
def _dec(fun):
for type_ in types:
self.createmm.add(fun, (type_,))
return fun
return _dec
def add_applier(self, *types):
def _dec(fun):
for type_ in types:
self.applymm.add(fun, (type_,))
return fun
return _dec
def add_converter(self, *types):
def _dec(fun):
for type_ in types:
self.applymm.add(self.cv_apply(fun), (type_,))
self.createmm.add(self.cv_create(fun), (type_,))
return fun
return _dec
def cv_apply(self, fun):
def _fun(*args, **kwargs):
args = list(args)
args[1] = fun(args[1])
return self.applymm(*args, **kwargs)
return _fun
def cv_create(self, fun):
def _fun(*args, **kwargs):
args = list(args)
args[1] = fun(args[1])
return self.createmm(*args, **kwargs)
return _fun
def create(self, *args, **kwargs):
return self.createmm(self, *args, **kwargs)
def apply(self, *args, **kwargs):
return self.applymm(self, *args, **kwargs)
def super_create(self, *args, **kwargs):
return self.createmm.super(self, *args, **kwargs)
def super_apply(self, *args, **kwargs):
return self.applymm.super(self, *args, **kwargs)
def test_super():
class String(str):
pass
mm = MultiMethod(lambda *a: a)
with pytest.raises(TypeError):
mm.super()
@mm.add_dec(str, str)
def foo(foo, bar):
return 'String'
# Suppress pep8 warning "F811 redefinition of unused 'foo' ..."
@mm.add_dec(String, str)
def foo(foo, bar):
return 'Fancy', mm.super(super(String, foo), bar)
assert mm('foo', 'bar') == 'String'
assert mm(String('foo'), 'bar') == ('Fancy', 'String')
def test_super():
class String(str):
pass
mm = MultiMethod(lambda *a: a)
with pytest.raises(TypeError):
mm.super()
@mm.add_dec(str, str)
def foo(foo, bar):
return 'String'
# Suppress pep8 warning "F811 redefinition of unused 'foo' ..."
@mm.add_dec(String, str) # noqa
def foo(foo, bar):
return 'Fancy', mm.super(super(String, foo), bar)
assert mm('foo', 'bar') == 'String'
assert mm(String('foo'), 'bar') == ('Fancy', 'String')