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import re
from typing import Any, Iterable, Iterator, List, Match, Pattern, Union, cast
from w3lib.html import replace_entities as w3lib_replace_entities
def flatten(x: Iterable[Any]) -> List[Any]:
"""flatten(sequence) -> list
Returns a single, flat list which contains all elements retrieved
from the sequence and all recursively contained sub-sequences
(iterables).
Examples:
>>> [1, 2, [3,4], (5,6)]
[1, 2, [3, 4], (5, 6)]
>>> flatten([[[1,2,3], (42,None)], [4,5], [6], 7, (8,9,10)])
[1, 2, 3, 42, None, 4, 5, 6, 7, 8, 9, 10]
>>> flatten(["foo", "bar"])
['foo', 'bar']
>>> flatten(["foo", ["baz", 42], "bar"])
['foo', 'baz', 42, 'bar']
"""
return list(iflatten(x))
def iflatten(x: Iterable[Any]) -> Iterator[Any]:
"""iflatten(sequence) -> Iterator
Similar to ``.flatten()``, but returns iterator instead"""
for el in x:
if _is_listlike(el):
yield from flatten(el)
else:
yield el
def _is_listlike(x: Any) -> bool:
"""
>>> _is_listlike("foo")
False
>>> _is_listlike(5)
False
>>> _is_listlike(b"foo")
False
>>> _is_listlike([b"foo"])
True
>>> _is_listlike((b"foo",))
True
>>> _is_listlike({})
True
>>> _is_listlike(set())
True
>>> _is_listlike((x for x in range(3)))
True
>>> _is_listlike(range(5))
True
"""
return hasattr(x, "__iter__") and not isinstance(x, (str, bytes))
def extract_regex(
regex: Union[str, Pattern[str]], text: str, replace_entities: bool = True
) -> List[str]:
"""Extract a list of strings from the given text/encoding using the following policies:
* if the regex contains a named group called "extract" that will be returned
* if the regex contains multiple numbered groups, all those will be returned (flattened)
* if the regex doesn't contain any group the entire regex matching is returned
"""
if isinstance(regex, str):
regex = re.compile(regex, re.UNICODE)
if "extract" in regex.groupindex:
# named group
try:
extracted = cast(Match[str], regex.search(text)).group("extract")
except AttributeError:
strings = []
else:
strings = [extracted] if extracted is not None else []
else:
# full regex or numbered groups
strings = regex.findall(text)
strings = flatten(strings)
if not replace_entities:
return strings
return [w3lib_replace_entities(s, keep=["lt", "amp"]) for s in strings]
def shorten(text: str, width: int, suffix: str = "...") -> str:
"""Truncate the given text to fit in the given width."""
if len(text) <= width:
return text
if width > len(suffix):
return text[: width - len(suffix)] + suffix
if width >= 0:
return suffix[len(suffix) - width :]
raise ValueError("width must be equal or greater than 0")
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