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#!/usr/bin/env python
# -*- encoding: utf-8 -*-
# Date Conditionals v0.1.7
# Copyright © 2015-2021, Chris Warrick.
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# 1. Redistributions of source code must retain the above copyright
# notice, this list of conditions, and the following disclaimer.
#
# 2. Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions, and the following disclaimer in the
# documentation and/or other materials provided with the distribution.
#
# 3. Neither the name of the author of this software nor the names of
# contributors to this software may be used to endorse or promote
# products derived from this software without specific prior written
# consent.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""Date range parser."""
import datetime
import dateutil.parser
import re
import operator
__all__ = ('date_in_range',)
CLAUSE = re.compile('(year|month|day|hour|minute|second|weekday|isoweekday)?'
' ?(==|!=|<=|>=|<|>) ?(.*)')
OPERATORS = {
'==': operator.eq,
'!=': operator.ne,
'<=': operator.le,
'>=': operator.ge,
'<': operator.lt,
'>': operator.gt,
}
def date_in_range(date_range, date, debug=False, now=None):
"""Check if date is in the range specified.
Format:
* comma-separated clauses (AND)
* clause: attribute comparison_operator value (spaces optional)
* attribute: year, month, day, hour, month, second, weekday, isoweekday
or empty for full datetime
* comparison_operator: == != <= >= < >
* value: integer, 'now', 'today', or dateutil-compatible date input
The optional `now` parameter can be used to provide a specific `now`/`today` value
(if none is provided, datetime.datetime.now()/datetime.date.today() is used).
"""
out = True
for item in date_range.split(','):
attribute, comparison_operator, value = CLAUSE.match(
item.strip()).groups()
if attribute in ('weekday', 'isoweekday'):
left = getattr(date, attribute)()
right = int(value)
elif value == 'now':
left = date
right = now or datetime.datetime.now()
elif value == 'today':
left = date.date() if isinstance(date, datetime.datetime) else date
if now:
right = now.date() if isinstance(now, datetime.datetime) else now
else:
right = datetime.date.today()
elif attribute:
left = getattr(date, attribute)
right = int(value)
else:
left = date
right = dateutil.parser.parse(value)
if debug: # pragma: no cover
print(" <{0} {1} {2}>".format(left, comparison_operator, right))
out = out and OPERATORS[comparison_operator](left, right)
return out
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