venv

1 files changed, 302 insertions, 0 deletions

diff --git a/venv/lib/python3.11/site-packages/sqlalchemy/orm/identity.py b/venv/lib/python3.11/site-packages/sqlalchemy/orm/identity.py
new file mode 100644
index 0000000..23682f7
--- /dev/null
+++ b/venv/lib/python3.11/site-packages/sqlalchemy/orm/identity.py
@@ -0,0 +1,302 @@
+# orm/identity.py
+# 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 __future__ import annotations
+
+from typing import Any
+from typing import cast
+from typing import Dict
+from typing import Iterable
+from typing import Iterator
+from typing import List
+from typing import NoReturn
+from typing import Optional
+from typing import Set
+from typing import Tuple
+from typing import TYPE_CHECKING
+from typing import TypeVar
+import weakref
+
+from . import util as orm_util
+from .. import exc as sa_exc
+
+if TYPE_CHECKING:
+    from ._typing import _IdentityKeyType
+    from .state import InstanceState
+
+
+_T = TypeVar("_T", bound=Any)
+
+_O = TypeVar("_O", bound=object)
+
+
+class IdentityMap:
+    _wr: weakref.ref[IdentityMap]
+
+    _dict: Dict[_IdentityKeyType[Any], Any]
+    _modified: Set[InstanceState[Any]]
+
+    def __init__(self) -> None:
+        self._dict = {}
+        self._modified = set()
+        self._wr = weakref.ref(self)
+
+    def _kill(self) -> None:
+        self._add_unpresent = _killed  # type: ignore
+
+    def all_states(self) -> List[InstanceState[Any]]:
+        raise NotImplementedError()
+
+    def contains_state(self, state: InstanceState[Any]) -> bool:
+        raise NotImplementedError()
+
+    def __contains__(self, key: _IdentityKeyType[Any]) -> bool:
+        raise NotImplementedError()
+
+    def safe_discard(self, state: InstanceState[Any]) -> None:
+        raise NotImplementedError()
+
+    def __getitem__(self, key: _IdentityKeyType[_O]) -> _O:
+        raise NotImplementedError()
+
+    def get(
+        self, key: _IdentityKeyType[_O], default: Optional[_O] = None
+    ) -> Optional[_O]:
+        raise NotImplementedError()
+
+    def fast_get_state(
+        self, key: _IdentityKeyType[_O]
+    ) -> Optional[InstanceState[_O]]:
+        raise NotImplementedError()
+
+    def keys(self) -> Iterable[_IdentityKeyType[Any]]:
+        return self._dict.keys()
+
+    def values(self) -> Iterable[object]:
+        raise NotImplementedError()
+
+    def replace(self, state: InstanceState[_O]) -> Optional[InstanceState[_O]]:
+        raise NotImplementedError()
+
+    def add(self, state: InstanceState[Any]) -> bool:
+        raise NotImplementedError()
+
+    def _fast_discard(self, state: InstanceState[Any]) -> None:
+        raise NotImplementedError()
+
+    def _add_unpresent(
+        self, state: InstanceState[Any], key: _IdentityKeyType[Any]
+    ) -> None:
+        """optional inlined form of add() which can assume item isn't present
+        in the map"""
+        self.add(state)
+
+    def _manage_incoming_state(self, state: InstanceState[Any]) -> None:
+        state._instance_dict = self._wr
+
+        if state.modified:
+            self._modified.add(state)
+
+    def _manage_removed_state(self, state: InstanceState[Any]) -> None:
+        del state._instance_dict
+        if state.modified:
+            self._modified.discard(state)
+
+    def _dirty_states(self) -> Set[InstanceState[Any]]:
+        return self._modified
+
+    def check_modified(self) -> bool:
+        """return True if any InstanceStates present have been marked
+        as 'modified'.
+
+        """
+        return bool(self._modified)
+
+    def has_key(self, key: _IdentityKeyType[Any]) -> bool:
+        return key in self
+
+    def __len__(self) -> int:
+        return len(self._dict)
+
+
+class WeakInstanceDict(IdentityMap):
+    _dict: Dict[_IdentityKeyType[Any], InstanceState[Any]]
+
+    def __getitem__(self, key: _IdentityKeyType[_O]) -> _O:
+        state = cast("InstanceState[_O]", self._dict[key])
+        o = state.obj()
+        if o is None:
+            raise KeyError(key)
+        return o
+
+    def __contains__(self, key: _IdentityKeyType[Any]) -> bool:
+        try:
+            if key in self._dict:
+                state = self._dict[key]
+                o = state.obj()
+            else:
+                return False
+        except KeyError:
+            return False
+        else:
+            return o is not None
+
+    def contains_state(self, state: InstanceState[Any]) -> bool:
+        if state.key in self._dict:
+            if TYPE_CHECKING:
+                assert state.key is not None
+            try:
+                return self._dict[state.key] is state
+            except KeyError:
+                return False
+        else:
+            return False
+
+    def replace(
+        self, state: InstanceState[Any]
+    ) -> Optional[InstanceState[Any]]:
+        assert state.key is not None
+        if state.key in self._dict:
+            try:
+                existing = existing_non_none = self._dict[state.key]
+            except KeyError:
+                # catch gc removed the key after we just checked for it
+                existing = None
+            else:
+                if existing_non_none is not state:
+                    self._manage_removed_state(existing_non_none)
+                else:
+                    return None
+        else:
+            existing = None
+
+        self._dict[state.key] = state
+        self._manage_incoming_state(state)
+        return existing
+
+    def add(self, state: InstanceState[Any]) -> bool:
+        key = state.key
+        assert key is not None
+        # inline of self.__contains__
+        if key in self._dict:
+            try:
+                existing_state = self._dict[key]
+            except KeyError:
+                # catch gc removed the key after we just checked for it
+                pass
+            else:
+                if existing_state is not state:
+                    o = existing_state.obj()
+                    if o is not None:
+                        raise sa_exc.InvalidRequestError(
+                            "Can't attach instance "
+                            "%s; another instance with key %s is already "
+                            "present in this session."
+                            % (orm_util.state_str(state), state.key)
+                        )
+                else:
+                    return False
+        self._dict[key] = state
+        self._manage_incoming_state(state)
+        return True
+
+    def _add_unpresent(
+        self, state: InstanceState[Any], key: _IdentityKeyType[Any]
+    ) -> None:
+        # inlined form of add() called by loading.py
+        self._dict[key] = state
+        state._instance_dict = self._wr
+
+    def fast_get_state(
+        self, key: _IdentityKeyType[_O]
+    ) -> Optional[InstanceState[_O]]:
+        return self._dict.get(key)
+
+    def get(
+        self, key: _IdentityKeyType[_O], default: Optional[_O] = None
+    ) -> Optional[_O]:
+        if key not in self._dict:
+            return default
+        try:
+            state = cast("InstanceState[_O]", self._dict[key])
+        except KeyError:
+            # catch gc removed the key after we just checked for it
+            return default
+        else:
+            o = state.obj()
+            if o is None:
+                return default
+            return o
+
+    def items(self) -> List[Tuple[_IdentityKeyType[Any], InstanceState[Any]]]:
+        values = self.all_states()
+        result = []
+        for state in values:
+            value = state.obj()
+            key = state.key
+            assert key is not None
+            if value is not None:
+                result.append((key, value))
+        return result
+
+    def values(self) -> List[object]:
+        values = self.all_states()
+        result = []
+        for state in values:
+            value = state.obj()
+            if value is not None:
+                result.append(value)
+
+        return result
+
+    def __iter__(self) -> Iterator[_IdentityKeyType[Any]]:
+        return iter(self.keys())
+
+    def all_states(self) -> List[InstanceState[Any]]:
+        return list(self._dict.values())
+
+    def _fast_discard(self, state: InstanceState[Any]) -> None:
+        # used by InstanceState for state being
+        # GC'ed, inlines _managed_removed_state
+        key = state.key
+        assert key is not None
+        try:
+            st = self._dict[key]
+        except KeyError:
+            # catch gc removed the key after we just checked for it
+            pass
+        else:
+            if st is state:
+                self._dict.pop(key, None)
+
+    def discard(self, state: InstanceState[Any]) -> None:
+        self.safe_discard(state)
+
+    def safe_discard(self, state: InstanceState[Any]) -> None:
+        key = state.key
+        if key in self._dict:
+            assert key is not None
+            try:
+                st = self._dict[key]
+            except KeyError:
+                # catch gc removed the key after we just checked for it
+                pass
+            else:
+                if st is state:
+                    self._dict.pop(key, None)
+                    self._manage_removed_state(state)
+
+
+def _killed(state: InstanceState[Any], key: _IdentityKeyType[Any]) -> NoReturn:
+    # external function to avoid creating cycles when assigned to
+    # the IdentityMap
+    raise sa_exc.InvalidRequestError(
+        "Object %s cannot be converted to 'persistent' state, as this "
+        "identity map is no longer valid.  Has the owning Session "
+        "been closed?" % orm_util.state_str(state),
+        code="lkrp",
+    )