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137 lines
3.7 KiB
137 lines
3.7 KiB
# engine/_py_processors.py
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# Copyright (C) 2010-2024 the SQLAlchemy authors and contributors
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# <see AUTHORS file>
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# Copyright (C) 2010 Gaetan de Menten gdementen@gmail.com
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#
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# This module is part of SQLAlchemy and is released under
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# the MIT License: https://www.opensource.org/licenses/mit-license.php
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"""defines generic type conversion functions, as used in bind and result
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processors.
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They all share one common characteristic: None is passed through unchanged.
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"""
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from __future__ import annotations
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import datetime
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from datetime import date as date_cls
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from datetime import datetime as datetime_cls
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from datetime import time as time_cls
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from decimal import Decimal
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import typing
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from typing import Any
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from typing import Callable
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from typing import Optional
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from typing import Type
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from typing import TypeVar
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from typing import Union
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_DT = TypeVar(
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"_DT", bound=Union[datetime.datetime, datetime.time, datetime.date]
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)
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def str_to_datetime_processor_factory(
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regexp: typing.Pattern[str], type_: Callable[..., _DT]
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) -> Callable[[Optional[str]], Optional[_DT]]:
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rmatch = regexp.match
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# Even on python2.6 datetime.strptime is both slower than this code
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# and it does not support microseconds.
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has_named_groups = bool(regexp.groupindex)
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def process(value: Optional[str]) -> Optional[_DT]:
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if value is None:
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return None
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else:
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try:
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m = rmatch(value)
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except TypeError as err:
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raise ValueError(
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"Couldn't parse %s string '%r' "
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"- value is not a string." % (type_.__name__, value)
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) from err
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if m is None:
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raise ValueError(
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"Couldn't parse %s string: "
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"'%s'" % (type_.__name__, value)
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)
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if has_named_groups:
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groups = m.groupdict(0)
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return type_(
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**dict(
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list(
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zip(
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iter(groups.keys()),
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list(map(int, iter(groups.values()))),
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)
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)
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)
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)
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else:
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return type_(*list(map(int, m.groups(0))))
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return process
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def to_decimal_processor_factory(
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target_class: Type[Decimal], scale: int
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) -> Callable[[Optional[float]], Optional[Decimal]]:
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fstring = "%%.%df" % scale
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def process(value: Optional[float]) -> Optional[Decimal]:
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if value is None:
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return None
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else:
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return target_class(fstring % value)
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return process
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def to_float(value: Optional[Union[int, float]]) -> Optional[float]:
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if value is None:
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return None
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else:
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return float(value)
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def to_str(value: Optional[Any]) -> Optional[str]:
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if value is None:
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return None
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else:
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return str(value)
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def int_to_boolean(value: Optional[int]) -> Optional[bool]:
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if value is None:
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return None
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else:
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return bool(value)
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def str_to_datetime(value: Optional[str]) -> Optional[datetime.datetime]:
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if value is not None:
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dt_value = datetime_cls.fromisoformat(value)
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else:
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dt_value = None
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return dt_value
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def str_to_time(value: Optional[str]) -> Optional[datetime.time]:
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if value is not None:
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dt_value = time_cls.fromisoformat(value)
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else:
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dt_value = None
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return dt_value
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def str_to_date(value: Optional[str]) -> Optional[datetime.date]:
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if value is not None:
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dt_value = date_cls.fromisoformat(value)
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else:
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dt_value = None
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return dt_value
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