mirror of https://github.com/evilhero/mylar
100 lines
2.9 KiB
Python
100 lines
2.9 KiB
Python
"""
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Fields represent CronTrigger options which map to :class:`~datetime.datetime`
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fields.
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"""
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from calendar import monthrange
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from apscheduler.triggers.cron.expressions import *
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__all__ = ('MIN_VALUES', 'MAX_VALUES', 'DEFAULT_VALUES', 'BaseField',
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'WeekField', 'DayOfMonthField', 'DayOfWeekField')
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MIN_VALUES = {'year': 1970, 'month': 1, 'day': 1, 'week': 1,
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'day_of_week': 0, 'hour': 0, 'minute': 0, 'second': 0}
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MAX_VALUES = {'year': 2 ** 63, 'month': 12, 'day:': 31, 'week': 53,
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'day_of_week': 6, 'hour': 23, 'minute': 59, 'second': 59}
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DEFAULT_VALUES = {'year': '*', 'month': 1, 'day': 1, 'week': '*',
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'day_of_week': '*', 'hour': 0, 'minute': 0, 'second': 0}
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class BaseField(object):
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REAL = True
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COMPILERS = [AllExpression, RangeExpression]
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def __init__(self, name, exprs, is_default=False):
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self.name = name
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self.is_default = is_default
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self.compile_expressions(exprs)
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def get_min(self, dateval):
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return MIN_VALUES[self.name]
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def get_max(self, dateval):
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return MAX_VALUES[self.name]
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def get_value(self, dateval):
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return getattr(dateval, self.name)
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def get_next_value(self, dateval):
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smallest = None
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for expr in self.expressions:
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value = expr.get_next_value(dateval, self)
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if smallest is None or (value is not None and value < smallest):
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smallest = value
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return smallest
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def compile_expressions(self, exprs):
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self.expressions = []
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# Split a comma-separated expression list, if any
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exprs = str(exprs).strip()
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if ',' in exprs:
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for expr in exprs.split(','):
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self.compile_expression(expr)
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else:
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self.compile_expression(exprs)
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def compile_expression(self, expr):
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for compiler in self.COMPILERS:
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match = compiler.value_re.match(expr)
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if match:
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compiled_expr = compiler(**match.groupdict())
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self.expressions.append(compiled_expr)
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return
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raise ValueError('Unrecognized expression "%s" for field "%s"' %
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(expr, self.name))
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def __str__(self):
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expr_strings = (str(e) for e in self.expressions)
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return ','.join(expr_strings)
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def __repr__(self):
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return "%s('%s', '%s')" % (self.__class__.__name__, self.name,
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str(self))
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class WeekField(BaseField):
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REAL = False
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def get_value(self, dateval):
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return dateval.isocalendar()[1]
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class DayOfMonthField(BaseField):
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COMPILERS = BaseField.COMPILERS + [WeekdayPositionExpression]
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def get_max(self, dateval):
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return monthrange(dateval.year, dateval.month)[1]
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class DayOfWeekField(BaseField):
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REAL = False
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COMPILERS = BaseField.COMPILERS + [WeekdayRangeExpression]
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def get_value(self, dateval):
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return dateval.weekday()
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