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