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"""
Read-only proxy for mappings.
Its main use is as the return type of cls.__dict__.
"""
from pypy.interpreter.baseobjspace import W_Root
from pypy.interpreter.error import oefmt
from pypy.interpreter.gateway import unwrap_spec, WrappedDefault
from pypy.interpreter.typedef import TypeDef, interp2app
class W_DictProxyObject(W_Root):
"Read-only proxy for mappings."
def __init__(self, w_mapping):
self.w_mapping = w_mapping
@staticmethod
def descr_new(space, w_type, w_mapping):
if (not space.lookup(w_mapping, "__getitem__") or
space.isinstance_w(w_mapping, space.w_list) or
space.isinstance_w(w_mapping, space.w_tuple)):
raise oefmt(space.w_TypeError,
"mappingproxy() argument must be a mapping, not %T",
w_mapping)
return W_DictProxyObject(w_mapping)
def descr_init(self, space, __args__):
pass
def descr_len(self, space):
return space.len(self.w_mapping)
def descr_getitem(self, space, w_key):
return space.getitem(self.w_mapping, w_key)
def descr_contains(self, space, w_key):
return space.contains(self.w_mapping, w_key)
def descr_iter(self, space):
return space.iter(self.w_mapping)
def descr_str(self, space):
return space.str(self.w_mapping)
def descr_repr(self, space):
return space.newunicode(u"mappingproxy(%s)" %
(space.unicode_w(space.repr(self.w_mapping)),))
@unwrap_spec(w_default=WrappedDefault(None))
def get_w(self, space, w_key, w_default):
return space.call_method(self.w_mapping, "get", w_key, w_default)
def keys_w(self, space):
return space.call_method(self.w_mapping, "keys")
def values_w(self, space):
return space.call_method(self.w_mapping, "values")
def items_w(self, space):
return space.call_method(self.w_mapping, "items")
def copy_w(self, space):
return space.call_method(self.w_mapping, "copy")
cmp_methods = {}
def make_cmp_method(op):
def descr_op(self, space, w_other):
return getattr(space, op)(self.w_mapping, w_other)
descr_name = 'descr_' + op
descr_op.__name__ = descr_name
setattr(W_DictProxyObject, descr_name, descr_op)
cmp_methods['__%s__' % op] = interp2app(getattr(W_DictProxyObject, descr_name))
for op in ['eq', 'ne', 'gt', 'ge', 'lt', 'le']:
make_cmp_method(op)
W_DictProxyObject.typedef = TypeDef(
'mappingproxy',
__new__=interp2app(W_DictProxyObject.descr_new),
__init__=interp2app(W_DictProxyObject.descr_init),
__len__=interp2app(W_DictProxyObject.descr_len),
__getitem__=interp2app(W_DictProxyObject.descr_getitem),
__contains__=interp2app(W_DictProxyObject.descr_contains),
__iter__=interp2app(W_DictProxyObject.descr_iter),
__str__=interp2app(W_DictProxyObject.descr_str),
__repr__=interp2app(W_DictProxyObject.descr_repr),
get=interp2app(W_DictProxyObject.get_w),
keys=interp2app(W_DictProxyObject.keys_w),
values=interp2app(W_DictProxyObject.values_w),
items=interp2app(W_DictProxyObject.items_w),
copy=interp2app(W_DictProxyObject.copy_w),
**cmp_methods
)
def _set_flag_map_or_seq(space):
w_type = space.gettypeobject(W_DictProxyObject.typedef)
w_type.flag_map_or_seq = 'M'
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