import regex as re
from datetime import datetime
from datetime import time
from tzlocal import get_localzone
from dateutil.relativedelta import relativedelta
from dateparser.utils import apply_timezone, localize_timezone, strip_braces
from .parser import time_parser
from .timezone_parser import pop_tz_offset_from_string
_UNITS = r'decade|year|month|week|day|hour|minute|second'
PATTERN = re.compile(r'(\d+)\s*(%s)\b' % _UNITS, re.I | re.S | re.U)
[docs]class FreshnessDateDataParser:
""" Parses date string like "1 year, 2 months ago" and "3 hours, 50 minutes ago" """
def __init__(self):
self.now = None
def _are_all_words_units(self, date_string):
skip = [_UNITS,
r'ago|in|\d+',
r':|[ap]m']
date_string = re.sub(r'\s+', ' ', date_string.strip())
words = [x for x in re.split(r'\W', date_string) if x]
words = [x for x in words if not re.match(r'%s' % '|'.join(skip), x)]
return not words
def _parse_time(self, date_string, settings):
"""Attempts to parse time part of date strings like '1 day ago, 2 PM' """
date_string = PATTERN.sub('', date_string)
date_string = re.sub(r'\b(?:ago|in)\b', '', date_string)
try:
return time_parser(date_string)
except:
pass
[docs] def get_local_tz(self):
return get_localzone()
[docs] def parse(self, date_string, settings):
date_string = strip_braces(date_string)
date_string, ptz = pop_tz_offset_from_string(date_string)
_time = self._parse_time(date_string, settings)
_settings_tz = settings.TIMEZONE.lower()
def apply_time(dateobj, timeobj):
if not isinstance(_time, time):
return dateobj
return dateobj.replace(
hour=timeobj.hour, minute=timeobj.minute,
second=timeobj.second, microsecond=timeobj.microsecond
)
if settings.RELATIVE_BASE:
self.now = settings.RELATIVE_BASE
if 'local' not in _settings_tz:
self.now = localize_timezone(self.now, settings.TIMEZONE)
if ptz:
if self.now.tzinfo:
self.now = self.now.astimezone(ptz)
else:
if hasattr(ptz, 'localize'):
self.now = ptz.localize(self.now)
else:
self.now = self.now.replace(tzinfo=ptz)
if not self.now.tzinfo:
if hasattr(self.get_local_tz(), 'localize'):
self.now = self.get_local_tz().localize(self.now)
else:
self.now = self.now.replace(tzinfo=self.get_local_tz())
elif ptz:
_now = datetime.now(ptz)
if 'local' in _settings_tz:
self.now = _now
else:
self.now = apply_timezone(_now, settings.TIMEZONE)
else:
if 'local' not in _settings_tz:
utc_dt = datetime.utcnow()
self.now = apply_timezone(utc_dt, settings.TIMEZONE)
else:
self.now = datetime.now(self.get_local_tz())
date, period = self._parse_date(date_string, settings.PREFER_DATES_FROM)
if date:
old_date = date
date = apply_time(date, _time)
if settings.RETURN_TIME_AS_PERIOD and old_date != date:
period = 'time'
if settings.TO_TIMEZONE:
date = apply_timezone(date, settings.TO_TIMEZONE)
if (
not settings.RETURN_AS_TIMEZONE_AWARE
or (settings.RETURN_AS_TIMEZONE_AWARE
and 'default' == settings.RETURN_AS_TIMEZONE_AWARE and not ptz)
):
date = date.replace(tzinfo=None)
self.now = None
return date, period
def _parse_date(self, date_string, prefer_dates_from):
if not self._are_all_words_units(date_string):
return None, None
kwargs = self.get_kwargs(date_string)
if not kwargs:
return None, None
period = 'day'
if 'days' not in kwargs:
for k in ['weeks', 'months', 'years']:
if k in kwargs:
period = k[:-1]
break
td = relativedelta(**kwargs)
if (
re.search(r'\bin\b', date_string)
or re.search(r'\bfuture\b', prefer_dates_from)
and not re.search(r'\bago\b', date_string)
):
date = self.now + td
else:
date = self.now - td
return date, period
[docs] def get_kwargs(self, date_string):
m = PATTERN.findall(date_string)
if not m:
return {}
kwargs = {}
for num, unit in m:
kwargs[unit + 's'] = int(num)
if 'decades' in kwargs:
kwargs['years'] = 10 * kwargs['decades'] + kwargs.get('years', 0)
del kwargs['decades']
return kwargs
[docs] def get_date_data(self, date_string, settings=None):
from dateparser.date import DateData
date, period = self.parse(date_string, settings)
return DateData(date_obj=date, period=period)
freshness_date_parser = FreshnessDateDataParser()