from cpython.dict cimport PyDict_New, PyDict_Update, PyDict_Size
|
|
|
def _readonly_fn(obj):
|
raise TypeError(
|
"%s object is immutable and/or readonly" % obj.__class__.__name__)
|
|
|
def _immutable_fn(obj):
|
raise TypeError(
|
"%s object is immutable" % obj.__class__.__name__)
|
|
|
class ReadOnlyContainer:
|
|
__slots__ = ()
|
|
def _readonly(self, *a,**kw):
|
_readonly_fn(self)
|
|
__delitem__ = __setitem__ = __setattr__ = _readonly
|
|
|
class ImmutableDictBase(dict):
|
def _immutable(self, *a,**kw):
|
_immutable_fn(self)
|
|
@classmethod
|
def __class_getitem__(cls, key):
|
return cls
|
|
__delitem__ = __setitem__ = __setattr__ = _immutable
|
clear = pop = popitem = setdefault = update = _immutable
|
|
|
cdef class immutabledict(dict):
|
def __repr__(self):
|
return f"immutabledict({dict.__repr__(self)})"
|
|
@classmethod
|
def __class_getitem__(cls, key):
|
return cls
|
|
def union(self, *args, **kw):
|
cdef dict to_merge = None
|
cdef immutabledict result
|
cdef Py_ssize_t args_len = len(args)
|
if args_len > 1:
|
raise TypeError(
|
f'union expected at most 1 argument, got {args_len}'
|
)
|
if args_len == 1:
|
attribute = args[0]
|
if isinstance(attribute, dict):
|
to_merge = <dict> attribute
|
if to_merge is None:
|
to_merge = dict(*args, **kw)
|
|
if PyDict_Size(to_merge) == 0:
|
return self
|
|
# new + update is faster than immutabledict(self)
|
result = immutabledict()
|
PyDict_Update(result, self)
|
PyDict_Update(result, to_merge)
|
return result
|
|
def merge_with(self, *other):
|
cdef immutabledict result = None
|
cdef object d
|
cdef bint update = False
|
if not other:
|
return self
|
for d in other:
|
if d:
|
if update == False:
|
update = True
|
# new + update is faster than immutabledict(self)
|
result = immutabledict()
|
PyDict_Update(result, self)
|
PyDict_Update(
|
result, <dict>(d if isinstance(d, dict) else dict(d))
|
)
|
|
return self if update == False else result
|
|
def copy(self):
|
return self
|
|
def __reduce__(self):
|
return immutabledict, (dict(self), )
|
|
def __delitem__(self, k):
|
_immutable_fn(self)
|
|
def __setitem__(self, k, v):
|
_immutable_fn(self)
|
|
def __setattr__(self, k, v):
|
_immutable_fn(self)
|
|
def clear(self, *args, **kw):
|
_immutable_fn(self)
|
|
def pop(self, *args, **kw):
|
_immutable_fn(self)
|
|
def popitem(self, *args, **kw):
|
_immutable_fn(self)
|
|
def setdefault(self, *args, **kw):
|
_immutable_fn(self)
|
|
def update(self, *args, **kw):
|
_immutable_fn(self)
|
|
# PEP 584
|
def __ior__(self, other):
|
_immutable_fn(self)
|
|
def __or__(self, other):
|
return immutabledict(dict.__or__(self, other))
|
|
def __ror__(self, other):
|
# NOTE: this is used only in cython 3.x;
|
# version 0.x will call __or__ with args inversed
|
return immutabledict(dict.__ror__(self, other))
|
