validators/src/validators/cron.py at 0.32.0 · python-validators/validators · GitHub

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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 * * * *')

# Output: True

>>> cron('30-20 * * * *')

# Output: ValidationError(func=cron, ...)

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

validators/src/validators/cron.py at 0.32.0 · python-validators/validators · GitHub

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