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"""Fields represent CronTrigger options which map to :class:`~datetime.datetime` fields."""
__all__ = (
"MIN_VALUES",
"MAX_VALUES",
"DEFAULT_VALUES",
"BaseField",
"WeekField",
"DayOfMonthField",
"DayOfWeekField",
)
import re
from calendar import monthrange
from apscheduler.triggers.cron.expressions import (
AllExpression,
LastDayOfMonthExpression,
MonthRangeExpression,
RangeExpression,
WeekdayPositionExpression,
WeekdayRangeExpression,
)
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,
}
SEPARATOR = re.compile(" *, *")
class BaseField:
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
for expr in SEPARATOR.split(str(exprs).strip()):
self.compile_expression(expr)
def compile_expression(self, expr):
for compiler in self.COMPILERS:
match = compiler.value_re.match(expr)
if match:
compiled_expr = compiler(**match.groupdict())
try:
compiled_expr.validate_range(self.name)
except ValueError as e:
raise ValueError(
f"Error validating expression {expr!r}: {e}"
) from None
self.expressions.append(compiled_expr)
return
raise ValueError(f'Unrecognized expression "{expr}" for field "{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 f"{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()
class MonthField(BaseField):
COMPILERS = BaseField.COMPILERS + [MonthRangeExpression]
|
