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|
"""
Parsing of a POSIX zone spec as described in the TZ part of section 8.3 in
http://pubs.opengroup.org/onlinepubs/009695399/basedefs/xbd_chap08.html.
"""
import re
from typing import Optional
from pendulum.constants import MONTHS_OFFSETS
from pendulum.constants import SECS_PER_DAY
from .exceptions import InvalidPosixSpec
_spec = re.compile(
"^"
r"(?P<std_abbr><.*?>|[^-+,\d]{3,})"
r"(?P<std_offset>([+-])?(\d{1,2})(:\d{2}(:\d{2})?)?)"
r"(?P<dst_info>"
r" (?P<dst_abbr><.*?>|[^-+,\d]{3,})"
r" (?P<dst_offset>([+-])?(\d{1,2})(:\d{2}(:\d{2})?)?)?"
r")?"
r"(?:,(?P<rules>"
r" (?P<dst_start>"
r" (?:J\d+|\d+|M\d{1,2}.\d.[0-6])"
r" (?:/(?P<dst_start_offset>([+-])?(\d+)(:\d{2}(:\d{2})?)?))?"
" )"
" ,"
r" (?P<dst_end>"
r" (?:J\d+|\d+|M\d{1,2}.\d.[0-6])"
r" (?:/(?P<dst_end_offset>([+-])?(\d+)(:\d{2}(:\d{2})?)?))?"
" )"
"))?"
"$",
re.VERBOSE,
)
def posix_spec(spec): # type: (str) -> PosixTimezone
try:
return _posix_spec(spec)
except ValueError:
raise InvalidPosixSpec(spec)
def _posix_spec(spec): # type: (str) -> PosixTimezone
m = _spec.match(spec)
if not m:
raise ValueError("Invalid posix spec")
std_abbr = _parse_abbr(m.group("std_abbr"))
std_offset = _parse_offset(m.group("std_offset"))
dst_abbr = None
dst_offset = None
if m.group("dst_info"):
dst_abbr = _parse_abbr(m.group("dst_abbr"))
if m.group("dst_offset"):
dst_offset = _parse_offset(m.group("dst_offset"))
else:
dst_offset = std_offset + 3600
dst_start = None
dst_end = None
if m.group("rules"):
dst_start = _parse_rule(m.group("dst_start"))
dst_end = _parse_rule(m.group("dst_end"))
return PosixTimezone(std_abbr, std_offset, dst_abbr, dst_offset, dst_start, dst_end)
def _parse_abbr(text): # type: (str) -> str
return text.lstrip("<").rstrip(">")
def _parse_offset(text, sign=-1): # type: (str, int) -> int
if text.startswith(("+", "-")):
if text.startswith("-"):
sign *= -1
text = text[1:]
minutes = 0
seconds = 0
parts = text.split(":")
hours = int(parts[0])
if len(parts) > 1:
minutes = int(parts[1])
if len(parts) > 2:
seconds = int(parts[2])
return sign * ((((hours * 60) + minutes) * 60) + seconds)
def _parse_rule(rule): # type: (str) -> PosixTransition
klass = NPosixTransition
args = ()
if rule.startswith("M"):
rule = rule[1:]
parts = rule.split(".")
month = int(parts[0])
week = int(parts[1])
day = int(parts[2].split("/")[0])
args += (month, week, day)
klass = MPosixTransition
elif rule.startswith("J"):
rule = rule[1:]
args += (int(rule.split("/")[0]),)
klass = JPosixTransition
else:
args += (int(rule.split("/")[0]),)
# Checking offset
parts = rule.split("/")
if len(parts) > 1:
offset = _parse_offset(parts[-1], sign=1)
else:
offset = 7200
args += (offset,)
return klass(*args)
class PosixTransition(object):
def __init__(self, offset): # type: (int) -> None
self._offset = offset
@property
def offset(self): # type: () -> int
return self._offset
def trans_offset(self, is_leap, jan1_weekday): # type: (bool, int) -> int
raise NotImplementedError()
class JPosixTransition(PosixTransition):
def __init__(self, day, offset): # type: (int, int) -> None
self._day = day
super(JPosixTransition, self).__init__(offset)
@property
def day(self): # type: () -> int
"""
day of non-leap year [1:365]
"""
return self._day
def trans_offset(self, is_leap, jan1_weekday): # type: (bool, int) -> int
days = self._day
if not is_leap or days < MONTHS_OFFSETS[1][3]:
days -= 1
return (days * SECS_PER_DAY) + self._offset
class NPosixTransition(PosixTransition):
def __init__(self, day, offset): # type: (int, int) -> None
self._day = day
super(NPosixTransition, self).__init__(offset)
@property
def day(self): # type: () -> int
"""
day of year [0:365]
"""
return self._day
def trans_offset(self, is_leap, jan1_weekday): # type: (bool, int) -> int
days = self._day
return (days * SECS_PER_DAY) + self._offset
class MPosixTransition(PosixTransition):
def __init__(self, month, week, weekday, offset):
# type: (int, int, int, int) -> None
self._month = month
self._week = week
self._weekday = weekday
super(MPosixTransition, self).__init__(offset)
@property
def month(self): # type: () -> int
"""
month of year [1:12]
"""
return self._month
@property
def week(self): # type: () -> int
"""
week of month [1:5] (5==last)
"""
return self._week
@property
def weekday(self): # type: () -> int
"""
0==Sun, ..., 6=Sat
"""
return self._weekday
def trans_offset(self, is_leap, jan1_weekday): # type: (bool, int) -> int
last_week = self._week == 5
days = MONTHS_OFFSETS[is_leap][self._month + int(last_week)]
weekday = (jan1_weekday + days) % 7
if last_week:
days -= (weekday + 7 - 1 - self._weekday) % 7 + 1
else:
days += (self._weekday + 7 - weekday) % 7
days += (self._week - 1) * 7
return (days * SECS_PER_DAY) + self._offset
class PosixTimezone:
"""
The entirety of a POSIX-string specified time-zone rule.
The standard abbreviation and offset are always given.
"""
def __init__(
self,
std_abbr, # type: str
std_offset, # type: int
dst_abbr, # type: Optional[str]
dst_offset, # type: Optional[int]
dst_start=None, # type: Optional[PosixTransition]
dst_end=None, # type: Optional[PosixTransition]
):
self._std_abbr = std_abbr
self._std_offset = std_offset
self._dst_abbr = dst_abbr
self._dst_offset = dst_offset
self._dst_start = dst_start
self._dst_end = dst_end
@property
def std_abbr(self): # type: () -> str
return self._std_abbr
@property
def std_offset(self): # type: () -> int
return self._std_offset
@property
def dst_abbr(self): # type: () -> Optional[str]
return self._dst_abbr
@property
def dst_offset(self): # type: () -> Optional[int]
return self._dst_offset
@property
def dst_start(self): # type: () -> Optional[PosixTransition]
return self._dst_start
@property
def dst_end(self): # type: () -> Optional[PosixTransition]
return self._dst_end
|
