from datetime import datetime, timedelta, timezone, tzinfo
import regex as re
from .timezones import timezone_info_list
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class StaticTzInfo(tzinfo):
def __init__(self, name, offset):
self.__offset = offset
self.__name = name
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def tzname(self, dt):
return self.__name
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def utcoffset(self, dt):
return self.__offset
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def dst(self, dt):
return timedelta(0)
def __repr__(self):
return "<%s '%s'>" % (self.__class__.__name__, self.__name)
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def localize(self, dt, is_dst=False):
if dt.tzinfo is not None:
raise ValueError("Not naive datetime (tzinfo is already set)")
return dt.replace(tzinfo=self)
def __getinitargs__(self):
return self.__name, self.__offset
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def pop_tz_offset_from_string(date_string, as_offset=True):
if _search_regex_ignorecase.search(date_string):
for name, info in _tz_offsets:
timezone_re = info["regex"]
timezone_match = timezone_re.search(date_string)
if timezone_match:
start, stop = timezone_match.span()
date_string = date_string[: start + 1] + date_string[stop:]
return (
date_string,
StaticTzInfo(name, info["offset"]) if as_offset else name,
)
return date_string, None
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def word_is_tz(word):
return bool(_search_regex.match(word))
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def convert_to_local_tz(datetime_obj, datetime_tz_offset):
return datetime_obj - datetime_tz_offset + local_tz_offset
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def build_tz_offsets(search_regex_parts):
def get_offset(tz_obj, regex, repl="", replw=""):
return (
tz_obj[0],
{
"regex": re.compile(
re.sub(repl, replw, regex % tz_obj[0]), re.IGNORECASE
),
"offset": timedelta(seconds=tz_obj[1]),
},
)
for tz_info in timezone_info_list:
for regex in tz_info["regex_patterns"]:
for tz_obj in tz_info["timezones"]:
search_regex_parts.append(tz_obj[0])
yield get_offset(tz_obj, regex)
# alternate patterns
for replace, replacewith in tz_info.get("replace", []):
for tz_obj in tz_info["timezones"]:
search_regex_parts.append(re.sub(replace, replacewith, tz_obj[0]))
yield get_offset(tz_obj, regex, repl=replace, replw=replacewith)
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def get_local_tz_offset():
offset = datetime.now() - datetime.now(tz=timezone.utc).replace(tzinfo=None)
offset = timedelta(days=offset.days, seconds=round(offset.seconds, -1))
return offset
_search_regex_parts = []
_tz_offsets = list(build_tz_offsets(_search_regex_parts))
_search_regex = re.compile("|".join(_search_regex_parts))
_search_regex_ignorecase = re.compile("|".join(_search_regex_parts), re.IGNORECASE)
local_tz_offset = get_local_tz_offset()