forms.py 文件源码

def _clean_dates(self, values):
        """return a list of either a datetime, date or None.
        Each one can have an operator."""
        if not values:
            return []
        dates = []
        operators = re.compile('<=|>=|<|>|=')
        for block in [x.strip() for x in values.split(',') if x.strip()]:
            if operators.findall(block):
                operator, = operators.findall(block)
            else:
                operator = '='
            rest = operators.sub('', block).strip()
            if rest.lower() in ('null', 'incomplete'):
                date_obj = None
            elif rest.lower() == 'today':
                date_obj = timezone.now().replace(hour=0, minute=0, second=0)
            elif rest.lower() == 'yesterday':
                date_obj = timezone.now().replace(hour=0, minute=0, second=0)
                date_obj -= datetime.timedelta(days=1)
            else:
                try:
                    date_obj = dateutil.parser.parse(rest)
                except ValueError:
                    raise forms.ValidationError(f'Unable to parse {rest!r}')
                if timezone.is_naive(date_obj):
                    date_obj = timezone.make_aware(date_obj)
            dates.append((operator, date_obj))

        return dates