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date_parser.py
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date_parser.py
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"""
Creates a multi-valued 'year_isim' field by parsing input strings.
"""
import re
import typing
from datetime import datetime
from dateutil import parser
NORMALIZED_RANGE = re.compile(r"(.*)/(.*)")
def get_dates(normalized_dates: typing.Any):
"""Maps a list of 'normalized_date' strings to a sorted list of datetime.
Args:
dates: A list of strings containing dates in the 'normalized_date' format.
Returns:
A list of years extracted from "dates".
"""
if not isinstance(normalized_dates, typing.Iterable):
return []
solr_dts = set()
for normalized_date in normalized_dates:
if not isinstance(normalized_date, str):
continue
match = NORMALIZED_RANGE.search(normalized_date)
if match:
start_str, end_str = match.groups()
start = get_date(start_str)
end = get_date(end_str)
if start and end:
solr_dts.update({start, end})
else:
solr_date = get_date(normalized_date)
if solr_date:
solr_dts.add(solr_date)
return sorted(solr_dts)
def get_date(date: str):
"""Extracts the single 4-digit year found in the input date string.
Args:
date: a string containing a date in 'normalized_date' format.
Returns:
A single date.
"""
try:
parsed_date = parser.parse(date, default=datetime(1978, 1, 1))
return parsed_date
except ValueError as err:
print(err)
return None
return None