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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
__all__ = ["fast_float", "fast_int"]
def is_supported_fastnumbers(fastnumbers_version: str) -> 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)) >= (2, 0, 0)
# 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
except ImportError:
from natsort.compat.fake_fastnumbers import fast_float, fast_int # type: ignore
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