179 lines
5.4 KiB
Python
179 lines
5.4 KiB
Python
from __future__ import absolute_import
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from __future__ import unicode_literals
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from datetime import datetime, time
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from collections import namedtuple
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from django import forms
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from django.utils.dateparse import parse_datetime
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from django.utils.encoding import force_str
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from django.utils.translation import ugettext_lazy as _
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from .utils import handle_timezone
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from .widgets import RangeWidget, LookupTypeWidget, CSVWidget, BaseCSVWidget
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class RangeField(forms.MultiValueField):
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widget = RangeWidget
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def __init__(self, fields=None, *args, **kwargs):
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if fields is None:
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fields = (
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forms.DecimalField(),
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forms.DecimalField())
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super(RangeField, self).__init__(fields, *args, **kwargs)
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def compress(self, data_list):
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if data_list:
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return slice(*data_list)
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return None
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class DateRangeField(RangeField):
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def __init__(self, *args, **kwargs):
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fields = (
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forms.DateField(),
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forms.DateField())
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super(DateRangeField, self).__init__(fields, *args, **kwargs)
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def compress(self, data_list):
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if data_list:
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start_date, stop_date = data_list
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if start_date:
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start_date = handle_timezone(
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datetime.combine(start_date, time.min))
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if stop_date:
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stop_date = handle_timezone(
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datetime.combine(stop_date, time.max))
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return slice(start_date, stop_date)
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return None
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class DateTimeRangeField(RangeField):
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def __init__(self, *args, **kwargs):
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fields = (
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forms.DateTimeField(),
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forms.DateTimeField())
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super(DateTimeRangeField, self).__init__(fields, *args, **kwargs)
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class TimeRangeField(RangeField):
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def __init__(self, *args, **kwargs):
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fields = (
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forms.TimeField(),
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forms.TimeField())
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super(TimeRangeField, self).__init__(fields, *args, **kwargs)
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class Lookup(namedtuple('Lookup', ('value', 'lookup_type'))):
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# python nature is test __len__ on tuple types for boolean check
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def __len__(self):
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if not self.value:
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return 0
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return 2
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class LookupTypeField(forms.MultiValueField):
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def __init__(self, field, lookup_choices, *args, **kwargs):
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fields = (
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field,
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forms.ChoiceField(choices=lookup_choices)
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)
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defaults = {
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'widgets': [f.widget for f in fields],
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}
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widget = LookupTypeWidget(**defaults)
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kwargs['widget'] = widget
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super(LookupTypeField, self).__init__(fields, *args, **kwargs)
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def compress(self, data_list):
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if len(data_list) == 2:
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return Lookup(value=data_list[0], lookup_type=data_list[1] or 'exact')
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return Lookup(value=None, lookup_type='exact')
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class IsoDateTimeField(forms.DateTimeField):
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"""
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Supports 'iso-8601' date format too which is out the scope of
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the ``datetime.strptime`` standard library
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# ISO 8601: ``http://www.w3.org/TR/NOTE-datetime``
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Based on Gist example by David Medina https://gist.github.com/copitux/5773821
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"""
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ISO_8601 = 'iso-8601'
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input_formats = [ISO_8601]
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def strptime(self, value, format):
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value = force_str(value)
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if format == self.ISO_8601:
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parsed = parse_datetime(value)
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if parsed is None: # Continue with other formats if doesn't match
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raise ValueError
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return handle_timezone(parsed)
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return super(IsoDateTimeField, self).strptime(value, format)
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class BaseCSVField(forms.Field):
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"""
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Base field for validating CSV types. Value validation is performed by
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secondary base classes.
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ex::
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class IntegerCSVField(BaseCSVField, filters.IntegerField):
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pass
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"""
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base_widget_class = BaseCSVWidget
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def __init__(self, *args, **kwargs):
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widget = kwargs.get('widget') or self.widget
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kwargs['widget'] = self._get_widget_class(widget)
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super(BaseCSVField, self).__init__(*args, **kwargs)
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def _get_widget_class(self, widget):
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# passthrough, allows for override
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if isinstance(widget, BaseCSVWidget) or (
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isinstance(widget, type) and
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issubclass(widget, BaseCSVWidget)):
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return widget
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# complain since we are unable to reconstruct widget instances
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assert isinstance(widget, type), \
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"'%s.widget' must be a widget class, not %s." \
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% (self.__class__.__name__, repr(widget))
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bases = (self.base_widget_class, widget, )
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return type(str('CSV%s' % widget.__name__), bases, {})
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def clean(self, value):
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if value is None:
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return None
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return [super(BaseCSVField, self).clean(v) for v in value]
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class BaseRangeField(BaseCSVField):
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# Force use of text input, as range must always have two inputs. A date
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# input would only allow a user to input one value and would always fail.
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widget = CSVWidget
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default_error_messages = {
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'invalid_values': _('Range query expects two values.')
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}
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def clean(self, value):
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value = super(BaseRangeField, self).clean(value)
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if value is not None and len(value) != 2:
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raise forms.ValidationError(
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self.error_messages['invalid_values'],
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code='invalid_values')
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return value
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