def find_earliest_oai_date(self, metadata):
"""
Find the latest publication date (if any) in a record
"""
earliest = None
for date in metadata['date']:
try:
parsed = tolerant_datestamp_to_datetime(date)
if not valid_publication_date(parsed):
continue
if earliest is None or parsed < earliest:
earliest = parsed
except (DatestampError, ValueError):
continue
return earliest
def find_earliest_oai_date(self, metadata):
"""
Find the latest publication date (if any) in a record
"""
earliest = None
for date in metadata['date']:
try:
parsed = tolerant_datestamp_to_datetime(date)
if not valid_publication_date(parsed):
continue
if earliest is None or parsed < earliest:
earliest = parsed
except (DatestampError, ValueError):
continue
return earliest
def parse_crossref_date(date):
"""
Parse the date representation from CrossRef to a python object
"""
if not date:
return None
ret = None
if 'date-parts' in date:
try:
for date in date['date-parts']:
ret = date_from_dateparts(date)
if ret == datetime.date(year=1970, month=1, day=1):
ret = None
if ret is not None:
return ret
except ValueError:
pass
if 'raw' in date:
ret = tolerant_datestamp_to_datetime(date['raw']).date()
if valid_publication_date(ret):
return ret
def parse_crossref_date(date):
"""
Parse the date representation from CrossRef to a python object
"""
if not date:
return None
ret = None
if 'date-parts' in date:
try:
for date in date['date-parts']:
ret = date_from_dateparts(date)
if ret == datetime.date(year=1970, month=1, day=1):
ret = None
if ret is not None:
return ret
except ValueError:
pass
if 'raw' in date:
ret = tolerant_datestamp_to_datetime(date['raw']).date()
if valid_publication_date(ret):
return ret
def _parse_date(cls, data):
"""
Parse the date representation from citeproc to a date object
:param data: date extracted from citeproc
:returns: date object or None
"""
if not isinstance(data, dict):
return None
d = None
# First we try with date parts
try:
d = cls._parse_date_parts(data.get('date-parts')[0])
except Exception:
pass
# If this has no success, we try with raw date
if d is None and data.get('raw') is not None:
d = tolerant_datestamp_to_datetime(data['raw']).date()
# We validate, if bad, then set to None
if not valid_publication_date(d):
d = None
return d
def test_valid_publication_date(self):
self.assertEqual(valid_publication_date(datetime.date(6789, 1, 1)), False)
self.assertEqual(valid_publication_date(datetime.date(2018, 3, 4)), True)
self.assertEqual(valid_publication_date(None), False)