--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/web/lib/django/contrib/localflavor/pl/forms.py	Wed Jan 20 00:34:04 2010 +0100
@@ -0,0 +1,153 @@
+"""
+Polish-specific form helpers
+"""
+
+import re
+
+from django.forms import ValidationError
+from django.forms.fields import Select, RegexField
+from django.utils.translation import ugettext_lazy as _
+
+class PLProvinceSelect(Select):
+    """
+    A select widget with list of Polish administrative provinces as choices.
+    """
+    def __init__(self, attrs=None):
+        from pl_voivodeships import VOIVODESHIP_CHOICES
+        super(PLProvinceSelect, self).__init__(attrs, choices=VOIVODESHIP_CHOICES)
+
+class PLCountySelect(Select):
+    """
+    A select widget with list of Polish administrative units as choices.
+    """
+    def __init__(self, attrs=None):
+        from pl_administrativeunits import ADMINISTRATIVE_UNIT_CHOICES
+        super(PLCountySelect, self).__init__(attrs, choices=ADMINISTRATIVE_UNIT_CHOICES)
+
+class PLPESELField(RegexField):
+    """
+    A form field that validates as Polish Identification Number (PESEL).
+
+    Checks the following rules:
+        * the length consist of 11 digits
+        * has a valid checksum
+
+    The algorithm is documented at http://en.wikipedia.org/wiki/PESEL.
+    """
+    default_error_messages = {
+        'invalid': _(u'National Identification Number consists of 11 digits.'),
+        'checksum': _(u'Wrong checksum for the National Identification Number.'),
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(PLPESELField, self).__init__(r'^\d{11}$',
+            max_length=None, min_length=None, *args, **kwargs)
+
+    def clean(self,value):
+        super(PLPESELField, self).clean(value)
+        if not self.has_valid_checksum(value):
+            raise ValidationError(self.error_messages['checksum'])
+        return u'%s' % value
+
+    def has_valid_checksum(self, number):
+        """
+        Calculates a checksum with the provided algorithm.
+        """
+        multiple_table = (1, 3, 7, 9, 1, 3, 7, 9, 1, 3, 1)
+        result = 0
+        for i in range(len(number)):
+            result += int(number[i]) * multiple_table[i]
+        return result % 10 == 0
+
+class PLNIPField(RegexField):
+    """
+    A form field that validates as Polish Tax Number (NIP).
+    Valid forms are: XXX-XXX-YY-YY or XX-XX-YYY-YYY.
+
+    Checksum algorithm based on documentation at
+    http://wipos.p.lodz.pl/zylla/ut/nip-rego.html
+    """
+    default_error_messages = {
+        'invalid': _(u'Enter a tax number field (NIP) in the format XXX-XXX-XX-XX or XX-XX-XXX-XXX.'),
+        'checksum': _(u'Wrong checksum for the Tax Number (NIP).'),
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(PLNIPField, self).__init__(r'^\d{3}-\d{3}-\d{2}-\d{2}$|^\d{2}-\d{2}-\d{3}-\d{3}$',
+            max_length=None, min_length=None, *args, **kwargs)
+
+    def clean(self,value):
+        super(PLNIPField, self).clean(value)
+        value = re.sub("[-]", "", value)
+        if not self.has_valid_checksum(value):
+            raise ValidationError(self.error_messages['checksum'])
+        return u'%s' % value
+
+    def has_valid_checksum(self, number):
+        """
+        Calculates a checksum with the provided algorithm.
+        """
+        multiple_table = (6, 5, 7, 2, 3, 4, 5, 6, 7)
+        result = 0
+        for i in range(len(number)-1):
+            result += int(number[i]) * multiple_table[i]
+
+        result %= 11
+        if result == int(number[-1]):
+            return True
+        else:
+            return False
+
+class PLREGONField(RegexField):
+    """
+    A form field that validates its input is a REGON number.
+
+    Valid regon number consists of 9 or 14 digits.
+    See http://www.stat.gov.pl/bip/regon_ENG_HTML.htm for more information.
+    """
+    default_error_messages = {
+        'invalid': _(u'National Business Register Number (REGON) consists of 9 or 14 digits.'),
+        'checksum': _(u'Wrong checksum for the National Business Register Number (REGON).'),
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(PLREGONField, self).__init__(r'^\d{9,14}$',
+            max_length=None, min_length=None, *args, **kwargs)
+
+    def clean(self,value):
+        super(PLREGONField, self).clean(value)
+        if not self.has_valid_checksum(value):
+            raise ValidationError(self.error_messages['checksum'])
+        return u'%s' % value
+
+    def has_valid_checksum(self, number):
+        """
+        Calculates a checksum with the provided algorithm.
+        """
+        weights = (
+            (8, 9, 2, 3, 4, 5, 6, 7, -1),
+            (2, 4, 8, 5, 0, 9, 7, 3, 6, 1, 2, 4, 8, -1),
+            (8, 9, 2, 3, 4, 5, 6, 7, -1, 0, 0, 0, 0, 0),
+        )
+
+        weights = [table for table in weights if len(table) == len(number)]
+
+        for table in weights:
+            checksum = sum([int(n) * w for n, w in zip(number, table)])
+            if checksum % 11 % 10:
+                return False
+
+        return bool(weights)
+
+class PLPostalCodeField(RegexField):
+    """
+    A form field that validates as Polish postal code.
+    Valid code is XX-XXX where X is digit.
+    """
+    default_error_messages = {
+        'invalid': _(u'Enter a postal code in the format XX-XXX.'),
+    }
+
+    def __init__(self, *args, **kwargs):
+        super(PLPostalCodeField, self).__init__(r'^\d{2}-\d{3}$',
+            max_length=None, min_length=None, *args, **kwargs)