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import os
import sys
import types
from collections.abc import MutableSequence
from functools import total_ordering
from typing import Any, Type
__version__ = "1.5.0"
__all__ = ("FrozenList", "PyFrozenList") # type: Tuple[str, ...]
NO_EXTENSIONS = bool(os.environ.get("FROZENLIST_NO_EXTENSIONS")) # type: bool
@total_ordering
class FrozenList(MutableSequence):
__slots__ = ("_frozen", "_items")
if sys.version_info >= (3, 9):
__class_getitem__ = classmethod(types.GenericAlias)
else:
@classmethod
def __class_getitem__(
cls: Type["FrozenList"],
cls_item: Any,
) -> Type["FrozenList"]:
return cls
def __init__(self, items=None):
self._frozen = False
if items is not None:
items = list(items)
else:
items = []
self._items = items
@property
def frozen(self):
return self._frozen
def freeze(self):
self._frozen = True
def __getitem__(self, index):
return self._items[index]
def __setitem__(self, index, value):
if self._frozen:
raise RuntimeError("Cannot modify frozen list.")
self._items[index] = value
def __delitem__(self, index):
if self._frozen:
raise RuntimeError("Cannot modify frozen list.")
del self._items[index]
def __len__(self):
return self._items.__len__()
def __iter__(self):
return self._items.__iter__()
def __reversed__(self):
return self._items.__reversed__()
def __eq__(self, other):
return list(self) == other
def __le__(self, other):
return list(self) <= other
def insert(self, pos, item):
if self._frozen:
raise RuntimeError("Cannot modify frozen list.")
self._items.insert(pos, item)
def __repr__(self):
return f"<FrozenList(frozen={self._frozen}, {self._items!r})>"
def __hash__(self):
if self._frozen:
return hash(tuple(self))
else:
raise RuntimeError("Cannot hash unfrozen list.")
PyFrozenList = FrozenList
if not NO_EXTENSIONS:
try:
from ._frozenlist import FrozenList as CFrozenList # type: ignore
except ImportError: # pragma: no cover
pass
else:
FrozenList = CFrozenList # type: ignore
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