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dates.py
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Sat, Aug 31, 12:20

dates.py
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# -*- coding: utf-8 -*-
##
## This file is part of Invenio.
## Copyright (C) 2013 CERN.
##
## Invenio is free software; you can redistribute it and/or
## modify it under the terms of the GNU General Public License as
## published by the Free Software Foundation; either version 2 of the
## License, or (at your option) any later version.
##
## Invenio is distributed in the hope that it will be useful, but
## WITHOUT ANY WARRANTY; without even the implied warranty of
## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
## General Public License for more details.
##
## You should have received a copy of the GNU General Public License
## along with Invenio; if not, write to the Free Software Foundation, Inc.,
## 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
""" Plugin to correct and validate dates """
from datetime import datetime
try:
from dateutil import parser
HAS_DATEUTIL = True
except ImportError:
HAS_DATEUTIL = False
def check_record(record, fields, dayfirst=True, yearfirst=False,
date_format="%Y-%m-%d", allow_future=True,
minimum_date=datetime(1800,1,1)):
"""
Corrects and validates date fields
For detailed explanation of how dayfirst and yearfirst works, visit
http://labix.org/python-dateutil#head-b95ce2094d189a89f80f5ae52a05b4ab7b41af47
For detailed explanation of the date_format placeholders, visit
http://docs.python.org/2/library/datetime.html#strftime-strptime-behavior
This plugin needs the python-dateutil library to work.
@param dayfirst Consider the day first if ambiguous
@type dayfirst boolean
@param yearfirst Consider year first if ambiguous
@type yearfirst boolean
@param date_format normalized date format
@type date_format string
@param allow_future If False, dates in the future will be marked as invalid
@type allow_future boolean
@param minimum_date dates older than this will be rejected. Default Jan 1 1800
@type minimum_date datetime.datetime
"""
if not HAS_DATEUTIL:
return
for position, value in record.iterfields(fields):
try:
new_date = parser.parse(value, dayfirst=dayfirst, yearfirst=yearfirst)
except (ValueError, TypeError):
record.set_invalid("Non-parseable date format in field %s" % position[0])
continue
if not allow_future and new_date > datetime.now():
record.set_invalid("Date in the future in field %s" % position[0])
if new_date < minimum_date:
record.set_invalid("Date too old (less than minimum_date) in field %s" % position[0])
if new_date < datetime(1900, 1, 1):
continue # strftime doesn't accept older dates
new_date_str = new_date.strftime(date_format)
record.amend_field(position, new_date_str)

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