--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/contrib/localflavor/it/forms.py	Fri Jul 18 18:22:23 2008 +0000
@@ -0,0 +1,83 @@
+"""
+IT-specific Form helpers
+"""
+
+from django.newforms import ValidationError
+from django.newforms.fields import Field, RegexField, Select, EMPTY_VALUES
+from django.utils.translation import ugettext
+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': ugettext('Enter a valid zip code.'),
+    }
+    def __init__(self, *args, **kwargs):
+        super(ITZipCodeField, self).__init__(r'^\d{5}$',
+        max_length=None, min_length=None, *args, **kwargs)
+
+class ITRegionSelect(Select):
+    """
+    A Select widget that uses a list of IT regions as its choices.
+    """
+    def __init__(self, attrs=None):
+        from it_region import REGION_CHOICES
+        super(ITRegionSelect, self).__init__(attrs, choices=REGION_CHOICES)
+
+class ITProvinceSelect(Select):
+    """
+    A Select widget that uses a list of IT regions as its choices.
+    """
+    def __init__(self, attrs=None):
+        from it_province import PROVINCE_CHOICES
+        super(ITProvinceSelect, self).__init__(attrs, choices=PROVINCE_CHOICES)
+
+class ITSocialSecurityNumberField(RegexField):
+    """
+    A form field that validates Italian Social Security numbers (codice fiscale).
+    For reference see http://www.agenziaentrate.it/ and search for
+    'Informazioni sulla codificazione delle persone fisiche'.
+    """
+    default_error_messages = {
+        'invalid': ugettext(u'Enter a valid Social Security number.'),
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(ITSocialSecurityNumberField, self).__init__(r'^\w{3}\s*\w{3}\s*\w{5}\s*\w{5}$',
+        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': ugettext(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)