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interval.py
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309 lines (224 loc) · 7.79 KB
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# -*- coding: utf-8 -*-
from datetime import timedelta
from .mixins.interval import (
WordableIntervalMixin
)
from .constants import (
SECONDS_PER_DAY, SECONDS_PER_HOUR,
SECONDS_PER_MINUTE
)
def _divide_and_round(a, b):
"""divide a by b and round result to the nearest integer
When the ratio is exactly half-way between two integers,
the even integer is returned.
"""
# Based on the reference implementation for divmod_near
# in Objects/longobject.c.
q, r = divmod(a, b)
# round up if either r / b > 0.5, or r / b == 0.5 and q is odd.
# The expression r / b > 0.5 is equivalent to 2 * r > b if b is
# positive, 2 * r < b if b negative.
r *= 2
greater_than_half = r > b if b > 0 else r < b
if greater_than_half or r == b and q % 2 == 1:
q += 1
return q
class BaseInterval(timedelta):
"""
Base class for all inherited interval classes.
"""
_y = None
_m = None
_w = None
_d = None
_h = None
_i = None
_s = None
_invert = None
def __new__(cls, days=0, seconds=0, microseconds=0,
milliseconds=0, minutes=0, hours=0, weeks=0):
self = timedelta.__new__(
cls, days, seconds, microseconds,
milliseconds, minutes, hours, weeks
)
# Intuitive normalization
total = self.total_seconds()
m = 1
if total < 0:
m = -1
self._microseconds = round(total % m * 1e6)
self._seconds = abs(int(total)) % SECONDS_PER_DAY * m
self._days = abs(int(total)) // SECONDS_PER_DAY * m
return self
def total_minutes(self):
return self.total_seconds() / SECONDS_PER_MINUTE
def total_hours(self):
return self.total_seconds() / SECONDS_PER_HOUR
def total_days(self):
return self.total_seconds() / SECONDS_PER_DAY
def total_weeks(self):
return self.total_days() / 7
@property
def weeks(self):
return abs(self.days) // 7 * self._sign(self._days)
@property
def days(self):
return self._days
@property
def remaining_days(self):
return abs(self._days) % 7 * self._sign(self._days)
@property
def hours(self):
if self._h is None:
seconds = self._seconds
self._h = 0
if abs(seconds) >= 3600:
self._h = (abs(seconds) // 3600 % 24) * self._sign(seconds)
return self._h
@property
def minutes(self):
if self._i is None:
seconds = self._seconds
self._i = 0
if abs(seconds) >= 60:
self._i = (abs(seconds) // 60 % 60) * self._sign(seconds)
return self._i
@property
def seconds(self):
return self._seconds
@property
def remaining_seconds(self):
if self._s is None:
self._s = self._seconds
self._s = abs(self._s) % 60 * self._sign(self._s)
return self._s
@property
def microseconds(self):
return self._microseconds
@property
def invert(self):
if self._invert is None:
self._invert = self.total_seconds() < 0
return self._invert
def in_weeks(self):
return int(self.total_weeks())
def in_days(self):
return int(self.total_days())
def in_hours(self):
return int(self.total_hours())
def in_minutes(self):
return int(self.total_minutes())
def in_seconds(self):
return int(self.total_seconds())
def _sign(self, value):
if value < 0:
return -1
return 1
def as_timedelta(self):
"""
Return the interval as a native timedelta.
:rtype: timedelta
"""
return timedelta(seconds=self.total_seconds())
class Interval(WordableIntervalMixin, BaseInterval):
"""
Replacement for the standard timedelta class.
Provides several improvements over the base class.
"""
@classmethod
def instance(cls, delta):
"""
Creates a Interval from a timedelta
:type delta: timedelta
:rtype: Interval
"""
return cls(days=delta.days, seconds=delta.seconds, microseconds=delta.microseconds)
def __add__(self, other):
if isinstance(other, timedelta):
return self.__class__(seconds=self.total_seconds() + other.total_seconds())
return NotImplemented
__radd__ = __add__
def __sub__(self, other):
if isinstance(other, timedelta):
return self.__class__(seconds=self.total_seconds() - other.total_seconds())
return NotImplemented
def __neg__(self):
return self.__class__(seconds=-self.total_seconds())
def _to_microseconds(self):
return ((self._days * (24*3600) + self._seconds) * 1000000 +
self._microseconds)
def __mul__(self, other):
if isinstance(other, int):
return self.__class__(seconds=self.total_seconds() * other)
if isinstance(other, float):
usec = self._to_microseconds()
a, b = other.as_integer_ratio()
return self.__class__(0, 0, _divide_and_round(usec * a, b))
return NotImplemented
__rmul__ = __mul__
def __floordiv__(self, other):
if not isinstance(other, (int, timedelta)):
return NotImplemented
usec = self._to_microseconds()
if isinstance(other, timedelta):
return usec // other._to_microseconds()
if isinstance(other, int):
return self.__class__(0, 0, usec // other)
def __truediv__(self, other):
if not isinstance(other, (int, float, timedelta)):
return NotImplemented
usec = self._to_microseconds()
if isinstance(other, timedelta):
return usec / other._to_microseconds()
if isinstance(other, int):
return self.__class__(0, 0, _divide_and_round(usec, other))
if isinstance(other, float):
a, b = other.as_integer_ratio()
return self.__class__(0, 0, _divide_and_round(b * usec, a))
__div__ = __floordiv__
def __mod__(self, other):
if isinstance(other, timedelta):
r = self._to_microseconds() % other._to_microseconds()
return self.__class__(0, 0, r)
return NotImplemented
def __divmod__(self, other):
if isinstance(other, timedelta):
q, r = divmod(self._to_microseconds(),
other._to_microseconds())
return q, self.__class__(0, 0, r)
return NotImplemented
Interval.min = Interval(-999999999)
Interval.max = Interval(days=999999999, hours=23,
minutes=59, seconds=59,
microseconds=999999)
Interval.resolution = Interval(microseconds=1)
class AbsoluteInterval(Interval):
"""
Interval that expresses a time difference in absolute values.
"""
def __new__(cls, days=0, seconds=0, microseconds=0,
milliseconds=0, minutes=0, hours=0, weeks=0):
self = timedelta.__new__(
cls, days, seconds, microseconds,
milliseconds, minutes, hours, weeks
)
# We need to compute the total_seconds() value
# on a native timedelta object
delta = timedelta(
days, seconds, microseconds,
milliseconds, minutes, hours, weeks
)
# Intuitive normalization
self._total = delta.total_seconds()
total = abs(self._total)
self._microseconds = round(total % 1 * 1e6)
self._seconds = int(total) % SECONDS_PER_DAY
self._days = int(total) // SECONDS_PER_DAY
return self
def total_seconds(self):
return abs(self._total)
@property
def invert(self):
if self._invert is None:
self._invert = self._total < 0
return self._invert