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