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# cyextension/immutabledict.pyx # Copyright (C) 2005-2024 the SQLAlchemy authors and contributors # <see AUTHORS file> # # This module is part of SQLAlchemy and is released under # the MIT License: https://www.opensource.org/licenses/mit-license.php 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))
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