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from collections.abc import MutableSequence
from functools import total_ordering
from .helpers import NO_EXTENSIONS
@total_ordering
class FrozenList(MutableSequence):
__slots__ = ("_frozen", "_items")
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})>"
PyFrozenList = FrozenList
try:
from aiohttp._frozenlist import FrozenList as CFrozenList # type: ignore
if not NO_EXTENSIONS:
FrozenList = CFrozenList # type: ignore
except ImportError: # pragma: no cover
pass
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