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