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- """General shared utilities."""
- import logging
- import re
- from itertools import tee, zip_longest
- from typing import Any, Iterable, Tuple
- # Do not update the version manually - it is managed by `bumpversion`.
- log = logging.getLogger(__name__)
- #: Regular expression for stripping non-alphanumeric characters
- NON_ALPHANUMERIC_STRIP_RE = re.compile(r'[\W_]+')
- def is_blank(string: str) -> bool:
- """Return True iff the string contains only whitespaces."""
- return not string.strip()
- def pairwise(
- iterable: Iterable,
- default_value: Any,
- ) -> Iterable[Tuple[Any, Any]]:
- """Return pairs of items from `iterable`.
- pairwise([1, 2, 3], default_value=None) -> (1, 2) (2, 3), (3, None)
- """
- a, b = tee(iterable)
- _ = next(b, default_value)
- return zip_longest(a, b, fillvalue=default_value)
- def common_prefix_length(a: str, b: str) -> int:
- """Return the length of the longest common prefix of a and b.
- >>> common_prefix_length('abcd', 'abce')
- 3
- """
- for common, (ca, cb) in enumerate(zip(a, b)):
- if ca != cb:
- return common
- return min(len(a), len(b))
- def strip_non_alphanumeric(string: str) -> str:
- """Strip string from any non-alphanumeric characters."""
- return NON_ALPHANUMERIC_STRIP_RE.sub('', string)
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