You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
77 lines
2.1 KiB
77 lines
2.1 KiB
# sql/_py_util.py
|
|
# Copyright (C) 2005-2023 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
|
|
|
|
import typing
|
|
from typing import Any
|
|
from typing import Dict
|
|
from typing import Tuple
|
|
from typing import Union
|
|
|
|
from ..util.typing import Literal
|
|
|
|
if typing.TYPE_CHECKING:
|
|
from .cache_key import CacheConst
|
|
|
|
|
|
class prefix_anon_map(Dict[str, str]):
|
|
"""A map that creates new keys for missing key access.
|
|
|
|
Considers keys of the form "<ident> <name>" to produce
|
|
new symbols "<name>_<index>", where "index" is an incrementing integer
|
|
corresponding to <name>.
|
|
|
|
Inlines the approach taken by :class:`sqlalchemy.util.PopulateDict` which
|
|
is otherwise usually used for this type of operation.
|
|
|
|
"""
|
|
|
|
def __missing__(self, key: str) -> str:
|
|
(ident, derived) = key.split(" ", 1)
|
|
anonymous_counter = self.get(derived, 1)
|
|
self[derived] = anonymous_counter + 1 # type: ignore
|
|
value = f"{derived}_{anonymous_counter}"
|
|
self[key] = value
|
|
return value
|
|
|
|
|
|
class cache_anon_map(
|
|
Dict[Union[int, "Literal[CacheConst.NO_CACHE]"], Union[Literal[True], str]]
|
|
):
|
|
"""A map that creates new keys for missing key access.
|
|
|
|
Produces an incrementing sequence given a series of unique keys.
|
|
|
|
This is similar to the compiler prefix_anon_map class although simpler.
|
|
|
|
Inlines the approach taken by :class:`sqlalchemy.util.PopulateDict` which
|
|
is otherwise usually used for this type of operation.
|
|
|
|
"""
|
|
|
|
_index = 0
|
|
|
|
def get_anon(self, object_: Any) -> Tuple[str, bool]:
|
|
|
|
idself = id(object_)
|
|
if idself in self:
|
|
s_val = self[idself]
|
|
assert s_val is not True
|
|
return s_val, True
|
|
else:
|
|
# inline of __missing__
|
|
self[idself] = id_ = str(self._index)
|
|
self._index += 1
|
|
|
|
return id_, False
|
|
|
|
def __missing__(self, key: int) -> str:
|
|
self[key] = val = str(self._index)
|
|
self._index += 1
|
|
return val
|