| 1 |
|
|---|
| 2 | import re
|
|---|
| 3 | from datetime import datetime, date, timedelta
|
|---|
| 4 |
|
|---|
| 5 |
|
|---|
| 6 | class DateFilter(object):
|
|---|
| 7 |
|
|---|
| 8 | """
|
|---|
| 9 | Filtering tools for the dates input provided by the user
|
|---|
| 10 | """
|
|---|
| 11 |
|
|---|
| 12 | def __init__(self, date_format):
|
|---|
| 13 | self.date_format = date_format
|
|---|
| 14 |
|
|---|
| 15 | def days(self, current_date, days, action='-'):
|
|---|
| 16 | """
|
|---|
| 17 | Add/substract the given number of days from the given current_date
|
|---|
| 18 | """
|
|---|
| 19 | delta = timedelta(days=days)
|
|---|
| 20 | if action == '-':
|
|---|
| 21 | new_date = current_date - delta
|
|---|
| 22 | else:
|
|---|
| 23 | new_date = current_date + delta
|
|---|
| 24 | new_date = new_date.replace(hour=0, minute=0, second=0)
|
|---|
| 25 | return new_date
|
|---|
| 26 |
|
|---|
| 27 | def days_ago(self, current_date, days):
|
|---|
| 28 | """
|
|---|
| 29 | Return the date N days ago from the current date
|
|---|
| 30 | """
|
|---|
| 31 | return self.days(current_date, days, '-')
|
|---|
| 32 |
|
|---|
| 33 | def days_future(self, current_date, days):
|
|---|
| 34 | """
|
|---|
| 35 | Return the date N days in the future from the current date
|
|---|
| 36 | """
|
|---|
| 37 | return self.days(current_date, days, '+')
|
|---|
| 38 |
|
|---|
| 39 | def months(self, current_date, months, action='-'):
|
|---|
| 40 | """
|
|---|
| 41 | Add/substract the given number of months from the given current_date
|
|---|
| 42 | """
|
|---|
| 43 | if action == '-':
|
|---|
| 44 | # start travelling in time, back to N months ago
|
|---|
| 45 | for n in range(months):
|
|---|
| 46 | current_date = current_date.replace(day=1) - timedelta(days=1)
|
|---|
| 47 | else:
|
|---|
| 48 | # start travelling in time, forward to N months
|
|---|
| 49 | for n in range(months):
|
|---|
| 50 | current_date = current_date.replace(day=1) + timedelta(days=1)
|
|---|
| 51 |
|
|---|
| 52 | # Now use the new year/month values + the current day to set the proper
|
|---|
| 53 | # date
|
|---|
| 54 | new_date = datetime(
|
|---|
| 55 | current_date.year, current_date.month, date.today().day)
|
|---|
| 56 | return new_date
|
|---|
| 57 |
|
|---|
| 58 | def months_ago(self, current_date, months):
|
|---|
| 59 | """
|
|---|
| 60 | Return the date N days ago from the current date
|
|---|
| 61 | """
|
|---|
| 62 | return self.months(current_date, months, '-')
|
|---|
| 63 |
|
|---|
| 64 | def months_future(self, current_date, months):
|
|---|
| 65 | """
|
|---|
| 66 | Return the date N days in the future from the current date
|
|---|
| 67 | """
|
|---|
| 68 | return self.months(current_date, months, '+')
|
|---|
| 69 |
|
|---|
| 70 | def parse_number_filter(self, number_filter, future=False):
|
|---|
| 71 | """
|
|---|
| 72 | If a filter contains a number of days/months/years, try to find
|
|---|
| 73 | out which filter it is exactly to apply it, then calculate the
|
|---|
| 74 | number of days and find
|
|---|
| 75 | """
|
|---|
| 76 | number = None
|
|---|
| 77 | filter_from = None
|
|---|
| 78 |
|
|---|
| 79 | if re.search(r'(\d+[dD]{1})', number_filter):
|
|---|
| 80 | number = int(number_filter.lower().replace('d', ''))
|
|---|
| 81 | if future:
|
|---|
| 82 | filtered_date = self.days_future(datetime.today(), number)
|
|---|
| 83 | else:
|
|---|
| 84 | filtered_date = self.days_ago(datetime.today(), number)
|
|---|
| 85 |
|
|---|
| 86 | elif re.search(r'(\d+[wW]{1})', number_filter):
|
|---|
| 87 | number = int(number_filter.lower().replace('w', '')) * 7
|
|---|
| 88 | if future:
|
|---|
| 89 | filtered_date = self.days_future(datetime.today(), number)
|
|---|
| 90 | else:
|
|---|
| 91 | filtered_date = self.days_ago(datetime.today(), number)
|
|---|
| 92 |
|
|---|
| 93 | elif re.search(r'(\d+[mM]{1})', number_filter):
|
|---|
| 94 | number = int(number_filter.lower().replace('m', ''))
|
|---|
| 95 | if future:
|
|---|
| 96 | filtered_date = self.months_future(datetime.today(), number)
|
|---|
| 97 | else:
|
|---|
| 98 | filtered_date = self.months_ago(datetime.today(), number)
|
|---|
| 99 |
|
|---|
| 100 | elif re.search(r'(\d+[yY]{1})', number_filter):
|
|---|
| 101 | number = int(number_filter.lower().replace('y', ''))
|
|---|
| 102 | today = date.today()
|
|---|
| 103 | if future:
|
|---|
| 104 | year = today.year + number
|
|---|
| 105 | else:
|
|---|
| 106 | year = today.year - number
|
|---|
| 107 | filtered_date = datetime(year, today.month, today.day)
|
|---|
| 108 |
|
|---|
| 109 | return number, filtered_date
|
|---|
| 110 |
|
|---|
| 111 | def validate(self, stamp_filter):
|
|---|
| 112 | """
|
|---|
| 113 | Validate a given filter. Filters can have the following notation:
|
|---|
| 114 |
|
|---|
| 115 | - %Y-%m-%d: Times recorded at a given date
|
|---|
| 116 |
|
|---|
| 117 | - %Y-%m-%d--%Y-%m-%d: Times recorded between two dates
|
|---|
| 118 |
|
|---|
| 119 | - *%Y-%m-%d: Times recorded up to a given date
|
|---|
| 120 |
|
|---|
| 121 | - %Y-%m-%d*: Times recorded from a given date
|
|---|
| 122 |
|
|---|
| 123 | - %Y-%m-%d+sN[d|w|m|y]: Times recorded since the given date up to
|
|---|
| 124 | N more days/weeks/months/years
|
|---|
| 125 |
|
|---|
| 126 | - N...N[d|w|m|y]: Times recorded N...N days/weeks/months/years ago
|
|---|
| 127 |
|
|---|
| 128 | Important: all date comparisons are made on datetime objects, using
|
|---|
| 129 | 00:00 as the time (first second of the given day). This means that
|
|---|
| 130 | for range filters, the first day is included, but the second day is not
|
|---|
| 131 | """
|
|---|
| 132 | filter_from = None
|
|---|
| 133 | filter_to = None
|
|---|
| 134 |
|
|---|
| 135 | if stamp_filter is None:
|
|---|
| 136 | return filter_from, filter_to
|
|---|
| 137 |
|
|---|
| 138 | if '--' in stamp_filter:
|
|---|
| 139 | filter_from, filter_to = stamp_filter.split('--')
|
|---|
| 140 | filter_from = datetime.strptime(filter_from, self.date_format)
|
|---|
| 141 | filter_to = datetime.strptime(filter_to, self.date_format)
|
|---|
| 142 |
|
|---|
| 143 | elif stamp_filter.startswith('*'):
|
|---|
| 144 | filter_to = datetime.strptime(stamp_filter, '*'+self.date_format)
|
|---|
| 145 | filter_to = filter_to.replace(hour=0, minute=0, second=0)
|
|---|
| 146 |
|
|---|
| 147 | elif stamp_filter.endswith('*'):
|
|---|
| 148 | filter_from = datetime.strptime(stamp_filter, self.date_format+'*')
|
|---|
| 149 | filter_from = filter_from.replace(hour=0, minute=0, second=0)
|
|---|
| 150 |
|
|---|
| 151 | elif '+' in stamp_filter:
|
|---|
| 152 | # "+" filtering works with a date following by "+", a number and
|
|---|
| 153 | # a letter (d|w|m|y) which sets the number of days, months, years
|
|---|
| 154 | # we would like to go into the future
|
|---|
| 155 | filter_to, number = stamp_filter.split('+')
|
|---|
| 156 | filter_to = datetime.strptime(filter_to, self.date_format)
|
|---|
| 157 | number, filter_from = self.parse_number_filter(number)
|
|---|
| 158 | filter_from = self.days_ago(filter_to, int(number))
|
|---|
| 159 | else:
|
|---|
| 160 | # Check if the user is asking for N days/weeks/months/years
|
|---|
| 161 | number, filter_from = self.parse_number_filter(stamp_filter)
|
|---|
| 162 | if number is None:
|
|---|
| 163 | # no filtering found, maybe they are giving us a fixed date
|
|---|
| 164 | try:
|
|---|
| 165 | filter_from = datetime.strptime(stamp_filter,
|
|---|
| 166 | self.date_format)
|
|---|
| 167 | except:
|
|---|
| 168 | # nothing to be used as a filter, go on, printing a warning
|
|---|
| 169 | print('[warning] invalid date filter: ' + stamp_filter)
|
|---|
| 170 | else:
|
|---|
| 171 | filter_from = filter_from.replace(hour=0, minute=0,
|
|---|
| 172 | second=0)
|
|---|
| 173 | filter_to = filter_from + timedelta(days=1)
|
|---|
| 174 |
|
|---|
| 175 | return filter_from, filter_to
|
|---|
