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- import copy
-
- from django.core.exceptions import ValidationError
- from django.core.validators import (
- MaxLengthValidator, MaxValueValidator, MinLengthValidator,
- MinValueValidator,
- )
- from django.utils.deconstruct import deconstructible
- from django.utils.translation import ugettext_lazy as _, ungettext_lazy
-
-
- class ArrayMaxLengthValidator(MaxLengthValidator):
- message = ungettext_lazy(
- 'List contains %(show_value)d item, it should contain no more than %(limit_value)d.',
- 'List contains %(show_value)d items, it should contain no more than %(limit_value)d.',
- 'limit_value')
-
-
- class ArrayMinLengthValidator(MinLengthValidator):
- message = ungettext_lazy(
- 'List contains %(show_value)d item, it should contain no fewer than %(limit_value)d.',
- 'List contains %(show_value)d items, it should contain no fewer than %(limit_value)d.',
- 'limit_value')
-
-
- @deconstructible
- class KeysValidator(object):
- """A validator designed for HStore to require/restrict keys."""
-
- messages = {
- 'missing_keys': _('Some keys were missing: %(keys)s'),
- 'extra_keys': _('Some unknown keys were provided: %(keys)s'),
- }
- strict = False
-
- def __init__(self, keys, strict=False, messages=None):
- self.keys = set(keys)
- self.strict = strict
- if messages is not None:
- self.messages = copy.copy(self.messages)
- self.messages.update(messages)
-
- def __call__(self, value):
- keys = set(value.keys())
- missing_keys = self.keys - keys
- if missing_keys:
- raise ValidationError(self.messages['missing_keys'],
- code='missing_keys',
- params={'keys': ', '.join(missing_keys)},
- )
- if self.strict:
- extra_keys = keys - self.keys
- if extra_keys:
- raise ValidationError(self.messages['extra_keys'],
- code='extra_keys',
- params={'keys': ', '.join(extra_keys)},
- )
-
- def __eq__(self, other):
- return (
- isinstance(other, self.__class__)
- and (self.keys == other.keys)
- and (self.messages == other.messages)
- and (self.strict == other.strict)
- )
-
- def __ne__(self, other):
- return not (self == other)
-
-
- class RangeMaxValueValidator(MaxValueValidator):
- compare = lambda self, a, b: a.upper > b
- message = _('Ensure that this range is completely less than or equal to %(limit_value)s.')
-
-
- class RangeMinValueValidator(MinValueValidator):
- compare = lambda self, a, b: a.lower < b
- message = _('Ensure that this range is completely greater than or equal to %(limit_value)s.')
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