/usr/share/pyshared/croniter/croniter.py is in python-croniter 0.3.4-1.
This file is owned by root:root, with mode 0o644.
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# -*- coding: utf-8 -*-
from __future__ import absolute_import, print_function
import re
from time import time, mktime
import datetime
from dateutil.relativedelta import relativedelta
search_re = re.compile(r'^([^-]+)-([^-/]+)(/(.*))?$')
only_int_re = re.compile(r'^\d+$')
any_int_re = re.compile(r'^\d+')
star_or_int_re = re.compile(r'^(\d+|\*)$')
__all__ = ('croniter',)
class croniter(object):
MONTHS_IN_YEAR = 12
RANGES = (
(0, 59),
(0, 23),
(1, 31),
(1, 12),
(0, 6),
(0, 59)
)
DAYS = (
31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31
)
ALPHACONV = (
{},
{},
{},
{'jan': 1, 'feb': 2, 'mar': 3, 'apr': 4, 'may': 5, 'jun': 6,
'jul': 7, 'aug': 8, 'sep': 9, 'oct': 10, 'nov': 11, 'dec': 12},
{'sun': 0, 'mon': 1, 'tue': 2, 'wed': 3, 'thu': 4, 'fri': 5, 'sat': 6},
{}
)
LOWMAP = (
{},
{},
{0: 1},
{0: 1},
{7: 0},
{},
)
bad_length = 'Exactly 5 or 6 columns has to be specified for iterator' \
'expression.'
def __init__(self, expr_format, start_time=time()):
self.tzinfo = None
if isinstance(start_time, datetime.datetime):
self.tzinfo = start_time.tzinfo
start_time = mktime(start_time.timetuple())
self.cur = start_time
self.exprs = expr_format.split()
if len(self.exprs) != 5 and len(self.exprs) != 6:
raise ValueError(self.bad_length)
expanded = []
for i, expr in enumerate(self.exprs):
e_list = expr.split(',')
res = []
while len(e_list) > 0:
e = e_list.pop()
t = re.sub(r'^\*(/.+)$', r'%d-%d\1' % (
self.RANGES[i][0],
self.RANGES[i][1]),
str(e))
m = search_re.search(t)
if m:
(low, high, step) = m.group(1), m.group(2), m.group(4) or 1
if not any_int_re.search(low):
low = self.ALPHACONV[i][low.lower()]
if not any_int_re.search(high):
high = self.ALPHACONV[i][high.lower()]
if (
not low or not high or int(low) > int(high)
or not only_int_re.search(str(step))
):
raise ValueError(
"[{0}] is not acceptable".format(expr_format))
low, high, step = map(int, [low, high, step])
e_list += range(low, high + 1, step)
# other solution
#try:
# for j in xrange(int(low), int(high) + 1):
# if j % int(step) == 0:
# e_list.append(j)
#except NameError:
# for j in range(int(low), int(high) + 1):
# if j % int(step) == 0:
# e_list.append(j)
else:
if not star_or_int_re.search(t):
t = self.ALPHACONV[i][t.lower()]
try:
t = int(t)
except:
pass
if t in self.LOWMAP[i]:
t = self.LOWMAP[i][t]
if t != '*' and (int(t) < self.RANGES[i][0] or
int(t) > self.RANGES[i][1]):
raise ValueError(
"[{0}] is not acceptable, out of range".format(
expr_format))
res.append(t)
res.sort()
expanded.append(['*'] if (len(res) == 1
and res[0] == '*')
else res)
self.expanded = expanded
def get_next(self, ret_type=float):
return self._get_next(ret_type, is_prev=False)
def get_prev(self, ret_type=float):
return self._get_next(ret_type, is_prev=True)
def get_current(self, ret_type=float):
if ret_type == datetime.datetime:
return datetime.datetime.fromtimestamp(self.cur)
return self.cur
# iterator protocol, to enable direct use of croniter
# objects in a loop, like "for dt in croniter('5 0 * * *'): ..."
# or for combining multiple croniters into single
# dates feed using 'itertools' module
def __iter__(self):
return self
__next__ = next = get_next
def all_next(self, ret_type=float):
'''Generator of all consecutive dates. Can be used instead of
implicit call to __iter__, whenever non-default
'ret_type' has to be specified.
'''
while True:
yield self._get_next(ret_type, is_prev=False)
def all_prev(self, ret_type=float):
'''Generator of all previous dates.'''
while True:
yield self._get_next(ret_type, is_prev=True)
iter = all_next # alias, you can call .iter() instead of .all_next()
def _get_next(self, ret_type=float, is_prev=False):
expanded = self.expanded[:]
if ret_type not in (float, datetime.datetime):
raise TypeError("Invalid ret_type, only 'float' or 'datetime' "
"is acceptable.")
if expanded[2][0] != '*' and expanded[4][0] != '*':
bak = expanded[4]
expanded[4] = ['*']
t1 = self._calc(self.cur, expanded, is_prev)
expanded[4] = bak
expanded[2] = ['*']
t2 = self._calc(self.cur, expanded, is_prev)
if not is_prev:
result = t1 if t1 < t2 else t2
else:
result = t1 if t1 > t2 else t2
else:
result = self._calc(self.cur, expanded, is_prev)
self.cur = result
if ret_type == datetime.datetime:
result = datetime.datetime.fromtimestamp(result)
if self.tzinfo:
result = self.tzinfo.localize(result)
return result
def _calc(self, now, expanded, is_prev):
if is_prev:
nearest_diff_method = self._get_prev_nearest_diff
sign = -1
else:
nearest_diff_method = self._get_next_nearest_diff
sign = 1
offset = len(expanded) == 6 and 1 or 60
dst = now = datetime.datetime.fromtimestamp(now + sign * offset)
day, month, year = dst.day, dst.month, dst.year
current_year = now.year
DAYS = self.DAYS
def proc_month(d):
if expanded[3][0] != '*':
diff_month = nearest_diff_method(
d.month, expanded[3], self.MONTHS_IN_YEAR)
days = DAYS[month - 1]
if month == 2 and self.is_leap(year) is True:
days += 1
reset_day = 1
if diff_month is not None and diff_month != 0:
if is_prev:
d += relativedelta(months=diff_month)
reset_day = DAYS[d.month - 1]
d += relativedelta(
day=reset_day, hour=23, minute=59, second=59)
else:
d += relativedelta(months=diff_month, day=reset_day,
hour=0, minute=0, second=0)
return True, d
return False, d
def proc_day_of_month(d):
if expanded[2][0] != '*':
days = DAYS[month - 1]
if month == 2 and self.is_leap(year) is True:
days += 1
if is_prev:
days_in_prev_month = DAYS[
(month - 2) % self.MONTHS_IN_YEAR]
diff_day = nearest_diff_method(
d.day, expanded[2], days_in_prev_month)
else:
diff_day = nearest_diff_method(d.day, expanded[2], days)
if diff_day is not None and diff_day != 0:
if is_prev:
d += relativedelta(
days=diff_day, hour=23, minute=59, second=59)
else:
d += relativedelta(
days=diff_day, hour=0, minute=0, second=0)
return True, d
return False, d
def proc_day_of_week(d):
if expanded[4][0] != '*':
diff_day_of_week = nearest_diff_method(
d.isoweekday() % 7, expanded[4], 7)
if diff_day_of_week is not None and diff_day_of_week != 0:
if is_prev:
d += relativedelta(days=diff_day_of_week,
hour=23, minute=59, second=59)
else:
d += relativedelta(days=diff_day_of_week,
hour=0, minute=0, second=0)
return True, d
return False, d
def proc_hour(d):
if expanded[1][0] != '*':
diff_hour = nearest_diff_method(d.hour, expanded[1], 24)
if diff_hour is not None and diff_hour != 0:
if is_prev:
d += relativedelta(
hours=diff_hour, minute=59, second=59)
else:
d += relativedelta(hours=diff_hour, minute=0, second=0)
return True, d
return False, d
def proc_minute(d):
if expanded[0][0] != '*':
diff_min = nearest_diff_method(d.minute, expanded[0], 60)
if diff_min is not None and diff_min != 0:
if is_prev:
d += relativedelta(minutes=diff_min, second=59)
else:
d += relativedelta(minutes=diff_min, second=0)
return True, d
return False, d
def proc_second(d):
if len(expanded) == 6:
if expanded[5][0] != '*':
diff_sec = nearest_diff_method(d.second, expanded[5], 60)
if diff_sec is not None and diff_sec != 0:
d += relativedelta(seconds=diff_sec)
return True, d
else:
d += relativedelta(second=0)
return False, d
procs = [proc_month,
proc_day_of_month,
proc_day_of_week,
proc_hour,
proc_minute,
proc_second]
while abs(year - current_year) <= 1:
next = False
for proc in procs:
(changed, dst) = proc(dst)
if changed:
next = True
break
if next:
continue
return mktime(dst.timetuple())
raise Exception("failed to find prev date")
def _get_next_nearest(self, x, to_check):
small = [item for item in to_check if item < x]
large = [item for item in to_check if item >= x]
large.extend(small)
return large[0]
def _get_prev_nearest(self, x, to_check):
small = [item for item in to_check if item <= x]
large = [item for item in to_check if item > x]
small.reverse()
large.reverse()
small.extend(large)
return small[0]
def _get_next_nearest_diff(self, x, to_check, range_val):
for i, d in enumerate(to_check):
if d >= x:
return d - x
return to_check[0] - x + range_val
def _get_prev_nearest_diff(self, x, to_check, range_val):
candidates = to_check[:]
candidates.reverse()
for d in candidates:
if d <= x:
return d - x
candidate = candidates[0]
for c in candidates:
if c < range_val:
candidate = c
break
return (candidate - x - range_val)
def is_leap(self, year):
if year % 400 == 0 or (year % 4 == 0 and year % 100 != 0):
return True
else:
return False
if __name__ == '__main__':
base = datetime.datetime(2010, 1, 25)
itr = croniter('0 0 1 * *', base)
n1 = itr.get_next(datetime.datetime)
print(n1)
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