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"""OpenAPI core util module"""
from itertools import chain
from typing import Any
from typing import Iterable
BOOLEAN_TRUE_VALUES = ("y", "yes", "t", "true", "on", "1")
BOOLEAN_FALSE_VALUES = ("n", "no", "f", "false", "off", "0")
def forcebool(val: Any) -> bool:
if isinstance(val, str):
val = val.lower()
if val in BOOLEAN_TRUE_VALUES:
return True
elif val in BOOLEAN_FALSE_VALUES:
return False
else:
raise ValueError(f"invalid truth value {val!r}")
return bool(val)
def chainiters(*lists: Iterable[Any]) -> Iterable[Any]:
iters = map(lambda l: l and iter(l) or [], lists)
return chain(*iters)
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