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Name	Size	Modified	Perms
📁 ..	-	09/05/2025 09:34:06 AM	rwxr-xr-x
📄 __init__.py	3.17 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 __init__.pyi	17.2 KB	12/18/2024 10:23:16 AM	rw-r--r--
📁 __pycache__	-	02/07/2025 10:01:50 PM	rwxr-xr-x
📄 _cmp.py	4 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _cmp.pyi	399 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 _compat.py	5.67 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _config.py	826 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 _funcs.py	16.34 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _make.py	94.71 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _next_gen.py	6.12 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _typing_compat.pyi	469 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 _version_info.py	2.07 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 _version_info.pyi	209 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 converters.py	3.52 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 converters.pyi	406 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 exceptions.py	1.85 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 exceptions.pyi	539 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 filters.py	1.44 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 filters.pyi	225 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 py.typed	0 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 setters.py	1.37 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 setters.pyi	567 bytes	12/18/2024 10:23:16 AM	rw-r--r--
📄 validators.py	20.22 KB	12/18/2024 10:23:16 AM	rw-r--r--
📄 validators.pyi	2.52 KB	12/18/2024 10:23:16 AM	rw-r--r--

Editing: converters.py

# SPDX-License-Identifier: MIT

"""
Commonly useful converters.
"""

import typing

from ._compat import _AnnotationExtractor
from ._make import NOTHING, Factory, pipe

__all__ = [
    "default_if_none",
    "optional",
    "pipe",
    "to_bool",
]

def optional(converter):
    """
    A converter that allows an attribute to be optional. An optional attribute
    is one which can be set to ``None``.

Type annotations will be inferred from the wrapped converter's, if it
    has any.

:param callable converter: the converter that is used for non-``None``
        values.

.. versionadded:: 17.1.0
    """

def optional_converter(val):
        if val is None:
            return None
        return converter(val)

xtr = _AnnotationExtractor(converter)

t = xtr.get_first_param_type()
    if t:
        optional_converter.__annotations__["val"] = typing.Optional[t]

rt = xtr.get_return_type()
    if rt:
        optional_converter.__annotations__["return"] = typing.Optional[rt]

return optional_converter

def default_if_none(default=NOTHING, factory=None):
    """
    A converter that allows to replace ``None`` values by *default* or the
    result of *factory*.

:param default: Value to be used if ``None`` is passed. Passing an instance
       of `attrs.Factory` is supported, however the ``takes_self`` option
       is *not*.
    :param callable factory: A callable that takes no parameters whose result
       is used if ``None`` is passed.

:raises TypeError: If **neither** *default* or *factory* is passed.
    :raises TypeError: If **both** *default* and *factory* are passed.
    :raises ValueError: If an instance of `attrs.Factory` is passed with
       ``takes_self=True``.

.. versionadded:: 18.2.0
    """
    if default is NOTHING and factory is None:
        raise TypeError("Must pass either `default` or `factory`.")

if default is not NOTHING and factory is not None:
        raise TypeError(
            "Must pass either `default` or `factory` but not both."
        )

if factory is not None:
        default = Factory(factory)

if isinstance(default, Factory):
        if default.takes_self:
            raise ValueError(
                "`takes_self` is not supported by default_if_none."
            )

def default_if_none_converter(val):
            if val is not None:
                return val

return default.factory()

else:

def default_if_none_converter(val):
            if val is not None:
                return val

return default

return default_if_none_converter

def to_bool(val):
    """
    Convert "boolean" strings (e.g., from env. vars.) to real booleans.

Values mapping to :code:`True`:

- :code:`True`
    - :code:`"true"` / :code:`"t"`
    - :code:`"yes"` / :code:`"y"`
    - :code:`"on"`
    - :code:`"1"`
    - :code:`1`

Values mapping to :code:`False`:

- :code:`False`
    - :code:`"false"` / :code:`"f"`
    - :code:`"no"` / :code:`"n"`
    - :code:`"off"`
    - :code:`"0"`
    - :code:`0`

:raises ValueError: for any other value.

.. versionadded:: 21.3.0
    """
    if isinstance(val, str):
        val = val.lower()
    truthy = {True, "true", "t", "yes", "y", "on", "1", 1}
    falsy = {False, "false", "f", "no", "n", "off", "0", 0}
    try:
        if val in truthy:
            return True
        if val in falsy:
            return False
    except TypeError:
        # Raised when "val" is not hashable (e.g., lists)
        pass
    raise ValueError(f"Cannot convert value to bool: {val}")