+
−"""
+
−IT-specific Form helpers
+
−"""
+
−
+
−from django.forms import ValidationError
+
−from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES
+
−from django.utils.translation import ugettext_lazy as _
+
−from django.utils.encoding import smart_unicode
+
−from django.contrib.localflavor.it.util import ssn_check_digit, vat_number_check_digit
+
−import re
+
−
+
−class ITZipCodeField(RegexField):
+
−    default_error_messages = {
+
−        'invalid': _('Enter a valid zip code.'),
+
−    }
+
−    def __init__(self, *args, **kwargs):
+
−        super(ITZipCodeField, self).__init__(r'^\d{5}$',
+
−        max_length=None, min_length=None, *args, **kwargs)
+
−
+
−class ITRegionSelect(Select):
+
−    """
+
−    A Select widget that uses a list of IT regions as its choices.
+
−    """
+
−    def __init__(self, attrs=None):
+
−        from it_region import REGION_CHOICES
+
−        super(ITRegionSelect, self).__init__(attrs, choices=REGION_CHOICES)
+
−
+
−class ITProvinceSelect(Select):
+
−    """
+
−    A Select widget that uses a list of IT provinces as its choices.
+
−    """
+
−    def __init__(self, attrs=None):
+
−        from it_province import PROVINCE_CHOICES
+
−        super(ITProvinceSelect, self).__init__(attrs, choices=PROVINCE_CHOICES)
+
−
+
−class ITSocialSecurityNumberField(RegexField):
+
−    """
+
−    A form field that validates Italian Social Security numbers (codice fiscale).
+
−    For reference see http://www.agenziaentrate.it/ and search for
+
−    'Informazioni sulla codificazione delle persone fisiche'.
+
−    """
+
−    default_error_messages = {
+
−        'invalid': _(u'Enter a valid Social Security number.'),
+
−    }
+
−
+
−    def __init__(self, *args, **kwargs):
+
−        super(ITSocialSecurityNumberField, self).__init__(r'^\w{3}\s*\w{3}\s*\w{5}\s*\w{5}$',
+
−        max_length=None, min_length=None, *args, **kwargs)
+
−
+
−    def clean(self, value):
+
−        value = super(ITSocialSecurityNumberField, self).clean(value)
+
−        if value == u'':
+
−            return value
+
−        value = re.sub('\s', u'', value).upper()
+
−        try:
+
−            check_digit = ssn_check_digit(value)
+
−        except ValueError:
+
−            raise ValidationError(self.error_messages['invalid'])
+
−        if not value[15] == check_digit:
+
−            raise ValidationError(self.error_messages['invalid'])
+
−        return value
+
−
+
−class ITVatNumberField(Field):
+
−    """
+
−    A form field that validates Italian VAT numbers (partita IVA).
+
−    """
+
−    default_error_messages = {
+
−        'invalid': _(u'Enter a valid VAT number.'),
+
−    }
+
−
+
−    def clean(self, value):
+
−        value = super(ITVatNumberField, self).clean(value)
+
−        if value == u'':
+
−            return value
+
−        try:
+
−            vat_number = int(value)
+
−        except ValueError:
+
−            raise ValidationError(self.error_messages['invalid'])
+
−        vat_number = str(vat_number).zfill(11)
+
−        check_digit = vat_number_check_digit(vat_number[0:10])
+
−        if not vat_number[10] == check_digit:
+
−            raise ValidationError(self.error_messages['invalid'])
+
−        return smart_unicode(vat_number)