"""
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
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)
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