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252 lines
9.0 KiB
252 lines
9.0 KiB
"""This module contains the expressions applicable for CronTrigger's fields."""
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from calendar import monthrange
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import re
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from apscheduler.util import asint
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__all__ = ('AllExpression', 'RangeExpression', 'WeekdayRangeExpression',
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'WeekdayPositionExpression', 'LastDayOfMonthExpression')
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WEEKDAYS = ['mon', 'tue', 'wed', 'thu', 'fri', 'sat', 'sun']
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MONTHS = ['jan', 'feb', 'mar', 'apr', 'may', 'jun', 'jul', 'aug', 'sep', 'oct', 'nov', 'dec']
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class AllExpression(object):
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value_re = re.compile(r'\*(?:/(?P<step>\d+))?$')
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def __init__(self, step=None):
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self.step = asint(step)
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if self.step == 0:
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raise ValueError('Increment must be higher than 0')
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def validate_range(self, field_name):
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from apscheduler.triggers.cron.fields import MIN_VALUES, MAX_VALUES
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value_range = MAX_VALUES[field_name] - MIN_VALUES[field_name]
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if self.step and self.step > value_range:
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raise ValueError('the step value ({}) is higher than the total range of the '
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'expression ({})'.format(self.step, value_range))
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def get_next_value(self, date, field):
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start = field.get_value(date)
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minval = field.get_min(date)
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maxval = field.get_max(date)
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start = max(start, minval)
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if not self.step:
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next = start
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else:
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distance_to_next = (self.step - (start - minval)) % self.step
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next = start + distance_to_next
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if next <= maxval:
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return next
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def __eq__(self, other):
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return isinstance(other, self.__class__) and self.step == other.step
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def __str__(self):
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if self.step:
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return '*/%d' % self.step
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return '*'
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def __repr__(self):
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return "%s(%s)" % (self.__class__.__name__, self.step)
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class RangeExpression(AllExpression):
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value_re = re.compile(
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r'(?P<first>\d+)(?:-(?P<last>\d+))?(?:/(?P<step>\d+))?$')
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def __init__(self, first, last=None, step=None):
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super(RangeExpression, self).__init__(step)
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first = asint(first)
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last = asint(last)
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if last is None and step is None:
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last = first
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if last is not None and first > last:
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raise ValueError('The minimum value in a range must not be higher than the maximum')
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self.first = first
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self.last = last
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def validate_range(self, field_name):
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from apscheduler.triggers.cron.fields import MIN_VALUES, MAX_VALUES
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super(RangeExpression, self).validate_range(field_name)
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if self.first < MIN_VALUES[field_name]:
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raise ValueError('the first value ({}) is lower than the minimum value ({})'
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.format(self.first, MIN_VALUES[field_name]))
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if self.last is not None and self.last > MAX_VALUES[field_name]:
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raise ValueError('the last value ({}) is higher than the maximum value ({})'
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.format(self.last, MAX_VALUES[field_name]))
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value_range = (self.last or MAX_VALUES[field_name]) - self.first
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if self.step and self.step > value_range:
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raise ValueError('the step value ({}) is higher than the total range of the '
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'expression ({})'.format(self.step, value_range))
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def get_next_value(self, date, field):
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startval = field.get_value(date)
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minval = field.get_min(date)
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maxval = field.get_max(date)
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# Apply range limits
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minval = max(minval, self.first)
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maxval = min(maxval, self.last) if self.last is not None else maxval
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nextval = max(minval, startval)
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# Apply the step if defined
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if self.step:
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distance_to_next = (self.step - (nextval - minval)) % self.step
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nextval += distance_to_next
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return nextval if nextval <= maxval else None
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def __eq__(self, other):
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return (isinstance(other, self.__class__) and self.first == other.first and
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self.last == other.last)
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def __str__(self):
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if self.last != self.first and self.last is not None:
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range = '%d-%d' % (self.first, self.last)
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else:
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range = str(self.first)
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if self.step:
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return '%s/%d' % (range, self.step)
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return range
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def __repr__(self):
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args = [str(self.first)]
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if self.last != self.first and self.last is not None or self.step:
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args.append(str(self.last))
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if self.step:
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args.append(str(self.step))
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return "%s(%s)" % (self.__class__.__name__, ', '.join(args))
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class MonthRangeExpression(RangeExpression):
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value_re = re.compile(r'(?P<first>[a-z]+)(?:-(?P<last>[a-z]+))?', re.IGNORECASE)
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def __init__(self, first, last=None):
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try:
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first_num = MONTHS.index(first.lower()) + 1
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except ValueError:
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raise ValueError('Invalid month name "%s"' % first)
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if last:
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try:
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last_num = MONTHS.index(last.lower()) + 1
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except ValueError:
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raise ValueError('Invalid month name "%s"' % last)
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else:
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last_num = None
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super(MonthRangeExpression, self).__init__(first_num, last_num)
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def __str__(self):
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if self.last != self.first and self.last is not None:
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return '%s-%s' % (MONTHS[self.first - 1], MONTHS[self.last - 1])
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return MONTHS[self.first - 1]
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def __repr__(self):
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args = ["'%s'" % MONTHS[self.first]]
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if self.last != self.first and self.last is not None:
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args.append("'%s'" % MONTHS[self.last - 1])
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return "%s(%s)" % (self.__class__.__name__, ', '.join(args))
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class WeekdayRangeExpression(RangeExpression):
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value_re = re.compile(r'(?P<first>[a-z]+)(?:-(?P<last>[a-z]+))?', re.IGNORECASE)
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def __init__(self, first, last=None):
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try:
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first_num = WEEKDAYS.index(first.lower())
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except ValueError:
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raise ValueError('Invalid weekday name "%s"' % first)
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if last:
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try:
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last_num = WEEKDAYS.index(last.lower())
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except ValueError:
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raise ValueError('Invalid weekday name "%s"' % last)
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else:
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last_num = None
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super(WeekdayRangeExpression, self).__init__(first_num, last_num)
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def __str__(self):
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if self.last != self.first and self.last is not None:
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return '%s-%s' % (WEEKDAYS[self.first], WEEKDAYS[self.last])
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return WEEKDAYS[self.first]
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def __repr__(self):
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args = ["'%s'" % WEEKDAYS[self.first]]
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if self.last != self.first and self.last is not None:
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args.append("'%s'" % WEEKDAYS[self.last])
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return "%s(%s)" % (self.__class__.__name__, ', '.join(args))
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class WeekdayPositionExpression(AllExpression):
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options = ['1st', '2nd', '3rd', '4th', '5th', 'last']
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value_re = re.compile(r'(?P<option_name>%s) +(?P<weekday_name>(?:\d+|\w+))' %
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'|'.join(options), re.IGNORECASE)
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def __init__(self, option_name, weekday_name):
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super(WeekdayPositionExpression, self).__init__(None)
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try:
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self.option_num = self.options.index(option_name.lower())
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except ValueError:
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raise ValueError('Invalid weekday position "%s"' % option_name)
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try:
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self.weekday = WEEKDAYS.index(weekday_name.lower())
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except ValueError:
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raise ValueError('Invalid weekday name "%s"' % weekday_name)
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def get_next_value(self, date, field):
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# Figure out the weekday of the month's first day and the number of days in that month
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first_day_wday, last_day = monthrange(date.year, date.month)
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# Calculate which day of the month is the first of the target weekdays
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first_hit_day = self.weekday - first_day_wday + 1
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if first_hit_day <= 0:
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first_hit_day += 7
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# Calculate what day of the month the target weekday would be
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if self.option_num < 5:
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target_day = first_hit_day + self.option_num * 7
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else:
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target_day = first_hit_day + ((last_day - first_hit_day) // 7) * 7
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if target_day <= last_day and target_day >= date.day:
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return target_day
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def __eq__(self, other):
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return (super(WeekdayPositionExpression, self).__eq__(other) and
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self.option_num == other.option_num and self.weekday == other.weekday)
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def __str__(self):
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return '%s %s' % (self.options[self.option_num], WEEKDAYS[self.weekday])
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def __repr__(self):
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return "%s('%s', '%s')" % (self.__class__.__name__, self.options[self.option_num],
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WEEKDAYS[self.weekday])
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class LastDayOfMonthExpression(AllExpression):
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value_re = re.compile(r'last', re.IGNORECASE)
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def __init__(self):
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super(LastDayOfMonthExpression, self).__init__(None)
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def get_next_value(self, date, field):
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return monthrange(date.year, date.month)[1]
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def __str__(self):
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return 'last'
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def __repr__(self):
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return "%s()" % self.__class__.__name__
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