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"""Cron."""
# local
from .utils import validator
def _validate_cron_component(component: str, min_val: int, max_val: int):
if component == "*":
return True
if component.isdecimal():
return min_val <= int(component) <= max_val
if "/" in component:
parts = component.split("/")
if len(parts) != 2 or not parts[1].isdecimal() or int(parts[1]) < 1:
return False
if parts[0] == "*":
return True
return parts[0].isdecimal() and min_val <= int(parts[0]) <= max_val
if "-" in component:
parts = component.split("-")
if len(parts) != 2 or not parts[0].isdecimal() or not parts[1].isdecimal():
return False
start, end = int(parts[0]), int(parts[1])
return min_val <= start <= max_val and min_val <= end <= max_val and start <= end
if "," in component:
for item in component.split(","):
if not _validate_cron_component(item, min_val, max_val):
return False
return True
# return all(
# _validate_cron_component(item, min_val, max_val) for item in component.split(",")
# ) # throws type error. why?
return False
@validator
def cron(value: str, /):
"""Return whether or not given value is a valid cron string.
Examples:
>>> cron('*/5 * * * *')
True
>>> cron('30-20 * * * *')
ValidationError(func=cron, args={'value': '30-20 * * * *'})
Args:
value:
Cron string to validate.
Returns:
(Literal[True]): If `value` is a valid cron string.
(ValidationError): If `value` is an invalid cron string.
"""
if not value:
return False
try:
minutes, hours, days, months, weekdays = value.strip().split()
except ValueError as err:
raise ValueError("Badly formatted cron string") from err
if not _validate_cron_component(minutes, 0, 59):
return False
if not _validate_cron_component(hours, 0, 23):
return False
if not _validate_cron_component(days, 1, 31):
return False
if not _validate_cron_component(months, 1, 12):
return False
if not _validate_cron_component(weekdays, 0, 6):
return False
return True