import collections import sys from collections.abc import Set from datetime import datetime, timedelta import regex as re from tzlocal import get_localzone from dateutil.relativedelta import relativedelta from dateparser.date_parser import date_parser from dateparser.freshness_date_parser import freshness_date_parser from dateparser.languages.loader import LocaleDataLoader from dateparser.conf import apply_settings, check_settings from dateparser.parser import _parse_absolute, _parse_nospaces from dateparser.timezone_parser import pop_tz_offset_from_string from dateparser.utils import apply_timezone_from_settings, \ set_correct_day_from_settings, \ get_timezone_from_tz_string from dateparser.custom_language_detection.language_mapping import map_languages APOSTROPHE_LOOK_ALIKE_CHARS = [ '\N{RIGHT SINGLE QUOTATION MARK}', # '\u2019' '\N{MODIFIER LETTER APOSTROPHE}', # '\u02bc' '\N{MODIFIER LETTER TURNED COMMA}', # '\u02bb' '\N{ARMENIAN APOSTROPHE}', # '\u055a' '\N{LATIN SMALL LETTER SALTILLO}', # '\ua78c' '\N{PRIME}', # '\u2032' '\N{REVERSED PRIME}', # '\u2035' '\N{MODIFIER LETTER PRIME}', # '\u02b9' '\N{FULLWIDTH APOSTROPHE}', # '\uff07' ] RE_NBSP = re.compile('\xa0', flags=re.UNICODE) RE_SPACES = re.compile(r'\s+') RE_TRIM_SPACES = re.compile(r'^\s+(\S.*?)\s+$') RE_TRIM_COLONS = re.compile(r'(\S.*?):*$') RE_SANITIZE_SKIP = re.compile(r'\t|\n|\r|\u00bb|,\s\u0432\b|\u200e|\xb7|\u200f|\u064e|\u064f', flags=re.M) RE_SANITIZE_RUSSIAN = re.compile(r'([\W\d])\u0433\.', flags=re.I | re.U) RE_SANITIZE_CROATIAN = re.compile(r'(\d+)\.\s?(\d+)\.\s?(\d+)\.( u)?', flags=re.I | re.U) RE_SANITIZE_PERIOD = re.compile(r'(?<=[^0-9\s])\.', flags=re.U) RE_SANITIZE_ON = re.compile(r'^.*?on:\s+(.*)') RE_SANITIZE_APOSTROPHE = re.compile('|'.join(APOSTROPHE_LOOK_ALIKE_CHARS)) RE_SEARCH_TIMESTAMP = re.compile(r'^(\d{10})(\d{3})?(\d{3})?(?![^.])') RE_SEARCH_NEGATIVE_TIMESTAMP = re.compile(r'^([-]\d{10})(\d{3})?(\d{3})?(?![^.])') def sanitize_spaces(date_string): date_string = RE_NBSP.sub(' ', date_string) date_string = RE_SPACES.sub(' ', date_string) date_string = RE_TRIM_SPACES.sub(r'\1', date_string) return date_string def date_range(begin, end, **kwargs): dateutil_error_prone_args = ['year', 'month', 'week', 'day', 'hour', 'minute', 'second'] for arg in dateutil_error_prone_args: if arg in kwargs: raise ValueError("Invalid argument: %s" % arg) step = relativedelta(**kwargs) if kwargs else relativedelta(days=1) date = begin while date < end: yield date date += step # handles edge-case when iterating months and last interval is < 30 days if kwargs.get('months', 0) > 0 and (date.year, date.month) == (end.year, end.month): yield end def get_intersecting_periods(low, high, period='day'): if period not in ['year', 'month', 'week', 'day', 'hour', 'minute', 'second', 'microsecond']: raise ValueError("Invalid period: {}".format(period)) if high <= low: return step = relativedelta(**{period + 's': 1}) current_period_start = low if isinstance(current_period_start, datetime): reset_arguments = {} for test_period in ['microsecond', 'second', 'minute', 'hour']: if test_period == period: break else: reset_arguments[test_period] = 0 current_period_start = current_period_start.replace(**reset_arguments) if period == 'week': current_period_start \ = current_period_start - timedelta(days=current_period_start.weekday()) elif period == 'month': current_period_start = current_period_start.replace(day=1) elif period == 'year': current_period_start = current_period_start.replace(month=1, day=1) while current_period_start < high: yield current_period_start current_period_start += step def sanitize_date(date_string): date_string = RE_SANITIZE_SKIP.sub(' ', date_string) date_string = RE_SANITIZE_RUSSIAN.sub(r'\1 ', date_string) # remove 'г.' (Russian for year) but not in words date_string = RE_SANITIZE_CROATIAN.sub(r'\1.\2.\3 ', date_string) # extra '.' and 'u' interferes with parsing relative fractional dates date_string = sanitize_spaces(date_string) date_string = RE_SANITIZE_PERIOD.sub('', date_string) date_string = RE_SANITIZE_ON.sub(r'\1', date_string) date_string = RE_TRIM_COLONS.sub(r'\1', date_string) date_string = RE_SANITIZE_APOSTROPHE.sub("'", date_string) date_string = date_string.strip() return date_string def get_date_from_timestamp(date_string, settings, negative=False): if negative: match = RE_SEARCH_NEGATIVE_TIMESTAMP.search(date_string) else: match = RE_SEARCH_TIMESTAMP.search(date_string) if match: if (settings is None or settings.TIMEZONE is None or 'local' in settings.TIMEZONE.lower()): # If the timezone in settings is unset, or it's 'local', use the # local timezone timezone = get_localzone() else: # Otherwise, use the timezone given in settings timezone = get_timezone_from_tz_string(settings.TIMEZONE) seconds = int(match.group(1)) millis = int(match.group(2) or 0) micros = int(match.group(3) or 0) date_obj = (datetime .fromtimestamp(seconds, timezone) .replace(microsecond=millis * 1000 + micros, tzinfo=None) ) date_obj = apply_timezone_from_settings(date_obj, settings) return date_obj def parse_with_formats(date_string, date_formats, settings): """ Parse with formats and return a dictionary with 'period' and 'obj_date'. :returns: :class:`datetime.datetime`, dict or None """ period = 'day' for date_format in date_formats: try: date_obj = datetime.strptime(date_string, date_format) except ValueError: continue else: if '%d' not in date_format: period = 'month' date_obj = set_correct_day_from_settings(date_obj, settings) if not ('%y' in date_format or '%Y' in date_format): today = datetime.today() date_obj = date_obj.replace(year=today.year) date_obj = apply_timezone_from_settings(date_obj, settings) return DateData(date_obj=date_obj, period=period) else: return DateData(date_obj=None, period=period) class _DateLocaleParser: def __init__(self, locale, date_string, date_formats, settings=None): self._settings = settings if not (date_formats is None or isinstance(date_formats, (list, tuple, Set))): raise TypeError("Date formats should be list, tuple or set of strings") self.locale = locale self.date_string = date_string self.date_formats = date_formats self._translated_date = None self._translated_date_with_formatting = None self._parsers = { 'timestamp': self._try_timestamp, 'negative-timestamp': self._try_negative_timestamp, 'relative-time': self._try_freshness_parser, 'custom-formats': self._try_given_formats, 'absolute-time': self._try_absolute_parser, 'no-spaces-time': self._try_nospaces_parser, } @classmethod def parse(cls, locale, date_string, date_formats=None, settings=None): instance = cls(locale, date_string, date_formats, settings) return instance._parse() def _parse(self): for parser_name in self._settings.PARSERS: date_data = self._parsers[parser_name]() if self._is_valid_date_data(date_data): return date_data else: return None def _try_timestamp_parser(self, negative=False): return DateData( date_obj=get_date_from_timestamp(self.date_string, self._settings, negative=negative), period='time' if self._settings.RETURN_TIME_AS_PERIOD else 'day', ) def _try_timestamp(self): return self._try_timestamp_parser() def _try_negative_timestamp(self): return self._try_timestamp_parser(negative=True) def _try_freshness_parser(self): try: return freshness_date_parser.get_date_data(self._get_translated_date(), self._settings) except (OverflowError, ValueError): return None def _try_absolute_parser(self): return self._try_parser(parse_method=_parse_absolute) def _try_nospaces_parser(self): return self._try_parser(parse_method=_parse_nospaces) def _try_parser(self, parse_method): _order = self._settings.DATE_ORDER try: if self._settings.PREFER_LOCALE_DATE_ORDER: if 'DATE_ORDER' not in self._settings._mod_settings: self._settings.DATE_ORDER = self.locale.info.get('date_order', _order) date_obj, period = date_parser.parse( self._get_translated_date(), parse_method=parse_method, settings=self._settings) self._settings.DATE_ORDER = _order return DateData( date_obj=date_obj, period=period, ) except ValueError: self._settings.DATE_ORDER = _order return None def _try_given_formats(self): if not self.date_formats: return return parse_with_formats( self._get_translated_date_with_formatting(), self.date_formats, settings=self._settings ) def _get_translated_date(self): if self._translated_date is None: self._translated_date = self.locale.translate( self.date_string, keep_formatting=False, settings=self._settings) return self._translated_date def _get_translated_date_with_formatting(self): if self._translated_date_with_formatting is None: self._translated_date_with_formatting = self.locale.translate( self.date_string, keep_formatting=True, settings=self._settings) return self._translated_date_with_formatting def _is_valid_date_data(self, date_data): if not isinstance(date_data, DateData): return False if not date_data['date_obj'] or not date_data['period']: return False if date_data['date_obj'] and not isinstance(date_data['date_obj'], datetime): return False if date_data['period'] not in ('time', 'day', 'week', 'month', 'year'): return False return True class DateData: """ Class that represents the parsed data with useful information. It can be accessed with square brackets like a dict object. """ def __init__(self, *, date_obj=None, period=None, locale=None): self.date_obj = date_obj self.period = period self.locale = locale def __getitem__(self, k): if not hasattr(self, k): raise KeyError(k) return getattr(self, k) def __setitem__(self, k, v): if not hasattr(self, k): raise KeyError(k) setattr(self, k, v) def __repr__(self): properties_text = ', '.join('{}={}'.format(prop, val.__repr__()) for prop, val in self.__dict__.items()) return '{}({})'.format( self.__class__.__name__, properties_text ) class DateDataParser: """ Class which handles language detection, translation and subsequent generic parsing of string representing date and/or time. :param languages: A list of language codes, e.g. ['en', 'es', 'zh-Hant']. If locales are not given, languages and region are used to construct locales for translation. :type languages: list :param locales: A list of locale codes, e.g. ['fr-PF', 'qu-EC', 'af-NA']. The parser uses only these locales to translate date string. :type locales: list :param region: A region code, e.g. 'IN', '001', 'NE'. If locales are not given, languages and region are used to construct locales for translation. :type region: str :param try_previous_locales: If True, locales previously used to translate date are tried first. :type try_previous_locales: bool :param use_given_order: If True, locales are tried for translation of date string in the order in which they are given. :type use_given_order: bool :param settings: Configure customized behavior using settings defined in :mod:`dateparser.conf.Settings`. :type settings: dict :param detect_languages_function: A function for language detection that takes as input a `text` and a `confidence_threshold`, and returns a list of detected language codes. Note: this function is only used if ``languages`` and ``locales`` are not provided. :type detect_languages_function: function :return: A parser instance :raises: ``ValueError``: Unknown Language, ``TypeError``: Languages argument must be a list, ``SettingValidationError``: A provided setting is not valid. """ locale_loader = None @apply_settings def __init__(self, languages=None, locales=None, region=None, try_previous_locales=False, use_given_order=False, settings=None, detect_languages_function=None): if languages is not None and not isinstance(languages, (list, tuple, Set)): raise TypeError("languages argument must be a list (%r given)" % type(languages)) if locales is not None and not isinstance(locales, (list, tuple, Set)): raise TypeError("locales argument must be a list (%r given)" % type(locales)) if region is not None and not isinstance(region, str): raise TypeError("region argument must be str (%r given)" % type(region)) if not isinstance(try_previous_locales, bool): raise TypeError("try_previous_locales argument must be a boolean (%r given)" % type(try_previous_locales)) if not isinstance(use_given_order, bool): raise TypeError("use_given_order argument must be a boolean (%r given)" % type(use_given_order)) if not locales and not languages and use_given_order: raise ValueError("locales or languages must be given if use_given_order is True") check_settings(settings) self._settings = settings self.try_previous_locales = try_previous_locales self.use_given_order = use_given_order self.languages = list(languages) if languages else None self.locales = locales self.region = region self.detect_languages_function = detect_languages_function self.previous_locales = collections.OrderedDict() def get_date_data(self, date_string, date_formats=None): """ Parse string representing date and/or time in recognizable localized formats. Supports parsing multiple languages and timezones. :param date_string: A string representing date and/or time in a recognizably valid format. :type date_string: str :param date_formats: A list of format strings using directives as given `here `_. The parser applies formats one by one, taking into account the detected languages. :type date_formats: list :return: a ``DateData`` object. :raises: ValueError - Unknown Language .. note:: *Period* values can be a 'day' (default), 'week', 'month', 'year', 'time'. *Period* represents the granularity of date parsed from the given string. In the example below, since no day information is present, the day is assumed to be current day ``16`` from *current date* (which is June 16, 2015, at the moment of writing this). Hence, the level of precision is ``month``: >>> DateDataParser().get_date_data('March 2015') DateData(date_obj=datetime.datetime(2015, 3, 16, 0, 0), period='month', locale='en') Similarly, for date strings with no day and month information present, level of precision is ``year`` and day ``16`` and month ``6`` are from *current_date*. >>> DateDataParser().get_date_data('2014') DateData(date_obj=datetime.datetime(2014, 6, 16, 0, 0), period='year', locale='en') Dates with time zone indications or UTC offsets are returned in UTC time unless specified using `Settings `__. >>> DateDataParser().get_date_data('23 March 2000, 1:21 PM CET') DateData(date_obj=datetime.datetime(2000, 3, 23, 13, 21, tzinfo=), period='day', locale='en') """ if not isinstance(date_string, str): raise TypeError('Input type must be str') res = parse_with_formats(date_string, date_formats or [], self._settings) if res['date_obj']: return res date_string = sanitize_date(date_string) for locale in self._get_applicable_locales(date_string): parsed_date = _DateLocaleParser.parse( locale, date_string, date_formats, settings=self._settings) if parsed_date: parsed_date['locale'] = locale.shortname if self.try_previous_locales: self.previous_locales[locale] = None return parsed_date else: return DateData(date_obj=None, period='day', locale=None) def get_date_tuple(self, *args, **kwargs): date_data = self.get_date_data(*args, **kwargs) fields = date_data.__dict__.keys() date_tuple = collections.namedtuple('DateData', fields) return date_tuple(**date_data.__dict__) def _get_applicable_locales(self, date_string): pop_tz_cache = [] def date_strings(): """ A generator instead of a static list to avoid calling pop_tz_offset_from_string if the first locale matches on unmodified date_string. """ yield date_string if not pop_tz_cache: stripped_date_string, _ = pop_tz_offset_from_string( date_string, as_offset=False) if stripped_date_string == date_string: stripped_date_string = None pop_tz_cache[:] = [stripped_date_string] stripped_date_string, = pop_tz_cache if stripped_date_string is not None: yield stripped_date_string if self.try_previous_locales: for locale in self.previous_locales.keys(): for s in date_strings(): if self._is_applicable_locale(locale, s): yield locale if self.detect_languages_function and not self.languages and not self.locales: detected_languages = self.detect_languages_function( text=date_string, confidence_threshold=self._settings.LANGUAGE_DETECTION_CONFIDENCE_THRESHOLD ) self.languages = map_languages(detected_languages) for locale in self._get_locale_loader().get_locales( languages=self.languages, locales=self.locales, region=self.region, use_given_order=self.use_given_order): for s in date_strings(): if self._is_applicable_locale(locale, s): yield locale if self._settings.DEFAULT_LANGUAGES: for locale in self._get_locale_loader().get_locales( languages=self._settings.DEFAULT_LANGUAGES, locales=None, region=self.region, use_given_order=self.use_given_order ): yield locale def _is_applicable_locale(self, locale, date_string): return locale.is_applicable( date_string, strip_timezone=False, # it is stripped outside settings=self._settings) @classmethod def _get_locale_loader(cls): if not cls.locale_loader: cls.locale_loader = LocaleDataLoader() return cls.locale_loader