120 lines
4.1 KiB
Python
120 lines
4.1 KiB
Python
#import re
|
|
|
|
|
|
#class CronTab(object):
|
|
# pass
|
|
|
|
|
|
#class ParseException(Exception):
|
|
# """Raised by crontab_parser when the input can't be parsed."""
|
|
|
|
|
|
## https://github.com/celery/celery/blob/master/celery/schedules.py
|
|
#class CrontabParser(object):
|
|
# """Parser for crontab expressions. Any expression of the form 'groups'
|
|
# (see BNF grammar below) is accepted and expanded to a set of numbers.
|
|
# These numbers represent the units of time that the crontab needs to
|
|
# run on::
|
|
# digit :: '0'..'9'
|
|
# dow :: 'a'..'z'
|
|
# number :: digit+ | dow+
|
|
# steps :: number
|
|
# range :: number ( '-' number ) ?
|
|
# numspec :: '*' | range
|
|
# expr :: numspec ( '/' steps ) ?
|
|
# groups :: expr ( ',' expr ) *
|
|
# The parser is a general purpose one, useful for parsing hours, minutes and
|
|
# day_of_week expressions. Example usage::
|
|
# >>> minutes = crontab_parser(60).parse('*/15')
|
|
# [0, 15, 30, 45]
|
|
# >>> hours = crontab_parser(24).parse('*/4')
|
|
# [0, 4, 8, 12, 16, 20]
|
|
# >>> day_of_week = crontab_parser(7).parse('*')
|
|
# [0, 1, 2, 3, 4, 5, 6]
|
|
# It can also parse day_of_month and month_of_year expressions if initialized
|
|
# with an minimum of 1. Example usage::
|
|
# >>> days_of_month = crontab_parser(31, 1).parse('*/3')
|
|
# [1, 4, 7, 10, 13, 16, 19, 22, 25, 28, 31]
|
|
# >>> months_of_year = crontab_parser(12, 1).parse('*/2')
|
|
# [1, 3, 5, 7, 9, 11]
|
|
# >>> months_of_year = crontab_parser(12, 1).parse('2-12/2')
|
|
# [2, 4, 6, 8, 10, 12]
|
|
# The maximum possible expanded value returned is found by the formula::
|
|
# max_ + min_ - 1
|
|
# """
|
|
# ParseException = ParseException
|
|
|
|
# _range = r'(\w+?)-(\w+)'
|
|
# _steps = r'/(\w+)?'
|
|
# _star = r'\*'
|
|
|
|
# def __init__(self, max_=60, min_=0):
|
|
# self.max_ = max_
|
|
# self.min_ = min_
|
|
# self.pats = (
|
|
# (re.compile(self._range + self._steps), self._range_steps),
|
|
# (re.compile(self._range), self._expand_range),
|
|
# (re.compile(self._star + self._steps), self._star_steps),
|
|
# (re.compile('^' + self._star + '$'), self._expand_star),
|
|
# )
|
|
|
|
# def parse(self, spec):
|
|
# acc = set()
|
|
# for part in spec.split(','):
|
|
# if not part:
|
|
# raise self.ParseException('empty part')
|
|
# acc |= set(self._parse_part(part))
|
|
# return acc
|
|
|
|
# def _parse_part(self, part):
|
|
# for regex, handler in self.pats:
|
|
# m = regex.match(part)
|
|
# if m:
|
|
# return handler(m.groups())
|
|
# return self._expand_range((part, ))
|
|
|
|
# def _expand_range(self, toks):
|
|
# fr = self._expand_number(toks[0])
|
|
# if len(toks) > 1:
|
|
# to = self._expand_number(toks[1])
|
|
# if to < fr: # Wrap around max_ if necessary
|
|
# return (list(range(fr, self.min_ + self.max_)) +
|
|
# list(range(self.min_, to + 1)))
|
|
# return list(range(fr, to + 1))
|
|
# return [fr]
|
|
|
|
# def _range_steps(self, toks):
|
|
# if len(toks) != 3 or not toks[2]:
|
|
# raise self.ParseException('empty filter')
|
|
# return self._expand_range(toks[:2])[::int(toks[2])]
|
|
|
|
# def _star_steps(self, toks):
|
|
# if not toks or not toks[0]:
|
|
# raise self.ParseException('empty filter')
|
|
# return self._expand_star()[::int(toks[0])]
|
|
|
|
# def _expand_star(self, *args):
|
|
# return list(range(self.min_, self.max_ + self.min_))
|
|
|
|
# def _expand_number(self, s):
|
|
# if isinstance(s, str) and s[0] == '-':
|
|
# raise self.ParseException('negative numbers not supported')
|
|
# try:
|
|
# i = int(s)
|
|
# except ValueError:
|
|
# try:
|
|
# i = weekday(s)
|
|
# except KeyError:
|
|
# raise ValueError('Invalid weekday literal {0!r}.'.format(s))
|
|
|
|
# max_val = self.min_ + self.max_ - 1
|
|
# if i > max_val:
|
|
# raise ValueError(
|
|
# 'Invalid end range: {0} > {1}.'.format(i, max_val))
|
|
# if i < self.min_:
|
|
# raise ValueError(
|
|
# 'Invalid beginning range: {0} < {1}.'.format(i, self.min_))
|
|
|
|
# return i
|
|
|