+
−"""
+
−Iceland specific form helpers.
+
−"""
+
−
+
−from django.forms import ValidationError
+
−from django.forms.fields import RegexField, EMPTY_VALUES
+
−from django.forms.widgets import Select
+
−from django.utils.translation import ugettext_lazy as _
+
−from django.utils.encoding import smart_unicode
+
−
+
−class ISIdNumberField(RegexField):
+
−    """
+
−    Icelandic identification number (kennitala). This is a number every citizen
+
−    of Iceland has.
+
−    """
+
−    default_error_messages = {
+
−        'invalid': _('Enter a valid Icelandic identification number. The format is XXXXXX-XXXX.'),
+
−        'checksum': _(u'The Icelandic identification number is not valid.'),
+
−    }
+
−
+
−    def __init__(self, *args, **kwargs):
+
−        kwargs['min_length'],kwargs['max_length'] = 10,11
+
−        super(ISIdNumberField, self).__init__(r'^\d{6}(-| )?\d{4}$', *args, **kwargs)
+
−
+
−    def clean(self, value):
+
−        value = super(ISIdNumberField, self).clean(value)
+
−
+
−        if value in EMPTY_VALUES:
+
−            return u''
+
−
+
−        value = self._canonify(value)
+
−        if self._validate(value):
+
−            return self._format(value)
+
−        else:
+
−            raise ValidationError(self.error_messages['checksum'])
+
−
+
−    def _canonify(self, value):
+
−        """
+
−        Returns the value as only digits.
+
−        """
+
−        return value.replace('-', '').replace(' ', '')
+
−
+
−    def _validate(self, value):
+
−        """
+
−        Takes in the value in canonical form and checks the verifier digit. The
+
−        method is modulo 11.
+
−        """
+
−        check = [3, 2, 7, 6, 5, 4, 3, 2, 1, 0]
+
−        return sum([int(value[i]) * check[i] for i in range(10)]) % 11 == 0
+
−
+
−    def _format(self, value):
+
−        """
+
−        Takes in the value in canonical form and returns it in the common
+
−        display format.
+
−        """
+
−        return smart_unicode(value[:6]+'-'+value[6:])
+
−
+
−class ISPhoneNumberField(RegexField):
+
−    """
+
−    Icelandic phone number. Seven digits with an optional hyphen or space after
+
−    the first three digits.
+
−    """
+
−    def __init__(self, *args, **kwargs):
+
−        kwargs['min_length'], kwargs['max_length'] = 7,8
+
−        super(ISPhoneNumberField, self).__init__(r'^\d{3}(-| )?\d{4}$', *args, **kwargs)
+
−
+
−    def clean(self, value):
+
−        value = super(ISPhoneNumberField, self).clean(value)
+
−
+
−        if value in EMPTY_VALUES:
+
−            return u''
+
−
+
−        return value.replace('-', '').replace(' ', '')
+
−
+
−class ISPostalCodeSelect(Select):
+
−    """
+
−    A Select widget that uses a list of Icelandic postal codes as its choices.
+
−    """
+
−    def __init__(self, attrs=None):
+
−        from is_postalcodes import IS_POSTALCODES
+
−        super(ISPostalCodeSelect, self).__init__(attrs, choices=IS_POSTALCODES)
+
−