# -*- coding: utf-8 -*-
import regex as re
from datetime import datetime, timedelta, tzinfo
from .timezones import timezone_info_list
[docs]class StaticTzInfo(tzinfo):
def __init__(self, name, offset):
self.__offset = offset
self.__name = name
[docs] def tzname(self, dt):
return self.__name
[docs] def utcoffset(self, dt):
return self.__offset
[docs] def dst(self, dt):
return timedelta(0)
def __repr__(self):
return "<%s '%s'>" % (self.__class__.__name__, self.__name)
[docs] 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
[docs]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
[docs]def word_is_tz(word):
return bool(_search_regex.match(word))
[docs]def convert_to_local_tz(datetime_obj, datetime_tz_offset):
return datetime_obj - datetime_tz_offset + local_tz_offset
[docs]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)
[docs]def get_local_tz_offset():
offset = datetime.now() - datetime.utcnow()
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()