"""
Czech-specific form helpers
"""
from django.core.validators import EMPTY_VALUES
from django.forms import ValidationError
from django.forms.fields import Select,RegexField,Field
from django.utils.translation import ugettext_lazy
import re
birth_number = re.compile(r'^(?P<birth>\d{6})/?(?P<id>\d{3,4})$')
ic_number = re.compile(r'^(?P<number>\d{7})(?P<check>\d)$')
class CZRegionSelect(Select):
"""
A select widget widget with list of Czech regions as choices.
"""
def __init__(self, attrs=None):
from cz_regions import REGION_CHOICES
super(CZRegionSelect, self).__init__(attrs, choices=REGION_CHOICES)
class CZPostalCodeField(RegexField):
"""
A form field that validates its input as Czech postal code.
Valid form is XXXXX or XXX XX, where X represents integer.
"""
default_error_messages = {
'invalid': _(u'Enter a postal code in the format XXXXX or XXX XX.'),
}
def __init__(self, *args, **kwargs):
super(CZPostalCodeField, self).__init__(r'^\d{5}$|^\d{3} \d{2}$',
max_length=None, min_length=None, *args, **kwargs)
def clean(self, value):
"""
Validates the input and returns a string that contains only numbers.
Returns an empty string for empty values.
"""
v = super(CZPostalCodeField, self).clean(value)
return v.replace(' ', '')
class CZBirthNumberField(Field):
"""
Czech birth number field.
"""
default_error_messages = {
'invalid_format': _(u'Enter a birth number in the format XXXXXX/XXXX or XXXXXXXXXX.'),
'invalid_gender': _(u'Invalid optional parameter Gender, valid values are \'f\' and \'m\''),
'invalid': _(u'Enter a valid birth number.'),
}
def clean(self, value, gender=None):
super(CZBirthNumberField, self).__init__(value)
if value in EMPTY_VALUES:
return u''
match = re.match(birth_number, value)
if not match:
raise ValidationError(self.error_messages['invalid_format'])
birth, id = match.groupdict()['birth'], match.groupdict()['id']
# Three digits for verificatin number were used until 1. january 1954
if len(id) == 3:
return u'%s' % value
# Birth number is in format YYMMDD. Females have month value raised by 50.
# In case that all possible number are already used (for given date),
# the month field is raised by 20.
if gender is not None:
if gender == 'f':
female_const = 50
elif gender == 'm':
female_const = 0
else:
raise ValidationError(self.error_messages['invalid_gender'])
month = int(birth[2:4]) - female_const
if (not 1 <= month <= 12):
if (not 1 <= (month - 20) <= 12):
raise ValidationError(self.error_messages['invalid'])
day = int(birth[4:6])
if not (1 <= day <= 31):
raise ValidationError(self.error_messages['invalid'])
# Fourth digit has been added since 1. January 1954.
# It is modulo of dividing birth number and verification number by 11.
# If the modulo were 10, the last number was 0 (and therefore, the whole
# birth number wasn't divisable by 11. These number are no longer used (since 1985)
# and the condition 'modulo == 10' can be removed in 2085.
modulo = int(birth + id[:3]) % 11
if (modulo == int(id[-1])) or (modulo == 10 and id[-1] == '0'):
return u'%s' % value
else:
raise ValidationError(self.error_messages['invalid'])
class CZICNumberField(Field):
"""
Czech IC number field.
"""
default_error_messages = {
'invalid': _(u'Enter a valid IC number.'),
}
def clean(self, value):
super(CZICNumberField, self).__init__(value)
if value in EMPTY_VALUES:
return u''
match = re.match(ic_number, value)
if not match:
raise ValidationError(self.error_messages['invalid'])
number, check = match.groupdict()['number'], int(match.groupdict()['check'])
sum = 0
weight = 8
for digit in number:
sum += int(digit)*weight
weight -= 1
remainder = sum % 11
# remainder is equal:
# 0 or 10: last digit is 1
# 1: last digit is 0
# in other case, last digin is 11 - remainder
if (not remainder % 10 and check == 1) or \
(remainder == 1 and check == 0) or \
(check == (11 - remainder)):
return u'%s' % value
raise ValidationError(self.error_messages['invalid'])
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