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postpone timezone regex evaluation until first use - shaves off time from package import #1181

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postpone timezone regex evaluation until first use - shaves off time from package import #1181

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42 changes: 35 additions & 7 deletions dateparser/timezone_parser.py
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Original file line number Diff line number Diff line change
Expand Up @@ -32,8 +32,8 @@ def __getinitargs__(self):


def pop_tz_offset_from_string(date_string, as_offset=True):
if _search_regex_ignorecase.search(date_string):
for name, info in _tz_offsets:
if TzRegexCache.search_regex_ignorecase().search(date_string):
for name, info in TzRegexCache.tz_offsets():
timezone_re = info["regex"]
timezone_match = timezone_re.search(date_string)
if timezone_match:
Expand All @@ -47,7 +47,7 @@ def pop_tz_offset_from_string(date_string, as_offset=True):


def word_is_tz(word):
return bool(_search_regex.match(word))
return bool(TzRegexCache.search_regex().match(word))


def convert_to_local_tz(datetime_obj, datetime_tz_offset):
Expand Down Expand Up @@ -85,8 +85,36 @@ def get_local_tz_offset():
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)
class TzRegexCache:
_ready = False
_search_regex_parts = []
_tz_offsets = []
_search_regex = None
_search_regex_ignorecase = None

@classmethod
def prepare(cls):
if not cls._ready:
cls._search_regex_parts = []
cls._tz_offsets = list(build_tz_offsets(cls._search_regex_parts))
cls._search_regex = re.compile("|".join(cls._search_regex_parts))
cls._search_regex_ignorecase = re.compile("|".join(cls._search_regex_parts), re.IGNORECASE)
cls._ready = True

@classmethod
def tz_offsets(cls):
cls.prepare()
return cls._tz_offsets

@classmethod
def search_regex(cls):
cls.prepare()
return cls._search_regex

@classmethod
def search_regex_ignorecase(cls):
cls.prepare()
return cls._search_regex_ignorecase


local_tz_offset = get_local_tz_offset()
6 changes: 3 additions & 3 deletions dateparser/utils/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@
from pytz import UTC, UnknownTimeZoneError, timezone
from tzlocal import get_localzone

from dateparser.timezone_parser import StaticTzInfo, _tz_offsets
from dateparser.timezone_parser import StaticTzInfo, TzRegexCache


def strip_braces(date_string):
Expand Down Expand Up @@ -73,7 +73,7 @@ def get_timezone_from_tz_string(tz_string):
try:
return timezone(tz_string)
except UnknownTimeZoneError as e:
for name, info in _tz_offsets:
for name, info in TzRegexCache.tz_offsets():
if info["regex"].search(" %s" % tz_string):
return StaticTzInfo(name, info["offset"])
else:
Expand Down Expand Up @@ -104,7 +104,7 @@ def apply_tzdatabase_timezone(date_time, pytz_string):


def apply_dateparser_timezone(utc_datetime, offset_or_timezone_abb):
for name, info in _tz_offsets:
for name, info in TzRegexCache.tz_offsets():
if info["regex"].search(" %s" % offset_or_timezone_abb):
tz = StaticTzInfo(name, info["offset"])
return utc_datetime.astimezone(tz)
Expand Down