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# -*- coding: utf-8 -*-
"""
Interface for natsort to access fastnumbers functions without
having to worry if it is actually installed.
"""
import re
from typing import Callable, Iterable, Iterator, Literal, Tuple, Union
StrOrFloat = Union[str, float]
StrOrInt = Union[str, int]
__all__ = ["try_float", "try_int"]
def is_supported_fastnumbers(
fastnumbers_version: str, minimum: Tuple[int, int, int] = (2, 0, 0)
) -> bool:
match = re.match(
r"^(\d+)\.(\d+)(\.(\d+))?([ab](\d+))?$",
fastnumbers_version,
flags=re.ASCII,
)
if not match:
raise ValueError(
"Invalid fastnumbers version number '{}'".format(fastnumbers_version)
)
(major, minor, patch) = match.group(1, 2, 4)
return (int(major), int(minor), int(patch)) >= minimum
# If the user has fastnumbers installed, they will get great speed
# benefits. If not, we use the simulated functions that come with natsort.
try:
# noinspection PyPackageRequirements
from fastnumbers import fast_float, fast_int, __version__ as fn_ver
# Require >= version 2.0.0.
if not is_supported_fastnumbers(fn_ver):
raise ImportError # pragma: no cover
# For versions of fastnumbers with mapping capability, use that
if is_supported_fastnumbers(fn_ver, (5, 0, 0)):
del fast_float, fast_int
from fastnumbers import try_float, try_int
except ImportError:
from natsort.compat.fake_fastnumbers import fast_float, fast_int # type: ignore
# Re-map the old-or-compatibility functions fast_float/fast_int to the
# newer API of try_float/try_int. If we already imported try_float/try_int
# then there is nothing to do.
if "try_float" not in globals():
def try_float( # noqa: F811, type: ignore[no-redef]
x: Iterable[str],
map: Literal[True],
nan: float = float("inf"),
on_fail: Callable[[str], str] = lambda x: x,
) -> Iterator[StrOrFloat]:
assert map is True
return (fast_float(y, nan=nan, key=on_fail) for y in x)
if "try_int" not in globals():
def try_int( # noqa: F811, type: ignore[no-redef]
x: Iterable[str],
map: Literal[True],
on_fail: Callable[[str], str] = lambda x: x,
) -> Iterator[StrOrInt]:
assert map is True
return (fast_int(y, key=on_fail) for y in x)
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