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"""Fields represent CronTrigger options which map to :class:`~datetime.datetime` fields."""
from calendar import monthrange
from apscheduler.triggers.cron.expressions import (
AllExpression, RangeExpression, WeekdayPositionExpression, LastDayOfMonthExpression,
WeekdayRangeExpression)
__all__ = ('MIN_VALUES', 'MAX_VALUES', 'DEFAULT_VALUES', 'BaseField', 'WeekField',
'DayOfMonthField', 'DayOfWeekField')
MIN_VALUES = {'year': 1970, 'month': 1, 'day': 1, 'week': 1, 'day_of_week': 0, 'hour': 0,
'minute': 0, 'second': 0}
MAX_VALUES = {'year': 9999, 'month': 12, 'day:': 31, 'week': 53, 'day_of_week': 6, 'hour': 23,
'minute': 59, 'second': 59}
DEFAULT_VALUES = {'year': '*', 'month': 1, 'day': 1, 'week': '*', 'day_of_week': '*', 'hour': 0,
'minute': 0, 'second': 0}
class BaseField(object):
REAL = True
COMPILERS = [AllExpression, RangeExpression]
def __init__(self, name, exprs, is_default=False):
self.name = name
self.is_default = is_default
self.compile_expressions(exprs)
def get_min(self, dateval):
return MIN_VALUES[self.name]
def get_max(self, dateval):
return MAX_VALUES[self.name]
def get_value(self, dateval):
return getattr(dateval, self.name)
def get_next_value(self, dateval):
smallest = None
for expr in self.expressions:
value = expr.get_next_value(dateval, self)
if smallest is None or (value is not None and value < smallest):
smallest = value
return smallest
def compile_expressions(self, exprs):
self.expressions = []
# Split a comma-separated expression list, if any
exprs = str(exprs).strip()
if ',' in exprs:
for expr in exprs.split(','):
self.compile_expression(expr)
else:
self.compile_expression(exprs)
def compile_expression(self, expr):
for compiler in self.COMPILERS:
match = compiler.value_re.match(expr)
if match:
compiled_expr = compiler(**match.groupdict())
self.expressions.append(compiled_expr)
return
raise ValueError('Unrecognized expression "%s" for field "%s"' % (expr, self.name))
def __eq__(self, other):
return isinstance(self, self.__class__) and self.expressions == other.expressions
def __str__(self):
expr_strings = (str(e) for e in self.expressions)
return ','.join(expr_strings)
def __repr__(self):
return "%s('%s', '%s')" % (self.__class__.__name__, self.name, self)
class WeekField(BaseField):
REAL = False
def get_value(self, dateval):
return dateval.isocalendar()[1]
class DayOfMonthField(BaseField):
COMPILERS = BaseField.COMPILERS + [WeekdayPositionExpression, LastDayOfMonthExpression]
def get_max(self, dateval):
return monthrange(dateval.year, dateval.month)[1]
class DayOfWeekField(BaseField):
REAL = False
COMPILERS = BaseField.COMPILERS + [WeekdayRangeExpression]
def get_value(self, dateval):
return dateval.weekday()
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