--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/contrib/localflavor/fi/forms.py	Wed Jan 20 00:34:04 2010 +0100
@@ -0,0 +1,50 @@
+"""
+FI-specific Form helpers
+"""
+
+import re
+from django.forms import ValidationError
+from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES
+from django.utils.translation import ugettext_lazy as _
+
+class FIZipCodeField(RegexField):
+    default_error_messages = {
+        'invalid': _('Enter a zip code in the format XXXXX.'),
+    }
+    def __init__(self, *args, **kwargs):
+        super(FIZipCodeField, self).__init__(r'^\d{5}$',
+            max_length=None, min_length=None, *args, **kwargs)
+
+class FIMunicipalitySelect(Select):
+    """
+    A Select widget that uses a list of Finnish municipalities as its choices.
+    """
+    def __init__(self, attrs=None):
+        from fi_municipalities import MUNICIPALITY_CHOICES
+        super(FIMunicipalitySelect, self).__init__(attrs, choices=MUNICIPALITY_CHOICES)
+
+class FISocialSecurityNumber(Field):
+    default_error_messages = {
+        'invalid': _('Enter a valid Finnish social security number.'),
+    }
+
+    def clean(self, value):
+        super(FISocialSecurityNumber, self).clean(value)
+        if value in EMPTY_VALUES:
+            return u''
+
+        checkmarks = "0123456789ABCDEFHJKLMNPRSTUVWXY"
+        result = re.match(r"""^
+            (?P<date>([0-2]\d|3[01])
+            (0\d|1[012])
+            (\d{2}))
+            [A+-]
+            (?P<serial>(\d{3}))
+            (?P<checksum>[%s])$""" % checkmarks, value, re.VERBOSE | re.IGNORECASE)
+        if not result:
+            raise ValidationError(self.error_messages['invalid'])
+        gd = result.groupdict()
+        checksum = int(gd['date'] + gd['serial'])
+        if checkmarks[checksum % len(checkmarks)] == gd['checksum'].upper():
+            return u'%s' % value.upper()
+        raise ValidationError(self.error_messages['invalid'])