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"""
UK-specific Form helpers
"""
import re
from django.forms.fields import CharField, Select
from django.forms import ValidationError
from django.utils.translation import ugettext_lazy as _
class UKPostcodeField(CharField):
"""
A form field that validates its input is a UK postcode.
The regular expression used is sourced from the schema for British Standard
BS7666 address types: http://www.govtalk.gov.uk/gdsc/schemas/bs7666-v2-0.xsd
The value is uppercased and a space added in the correct place, if required.
"""
default_error_messages = {
'invalid': _(u'Enter a valid postcode.'),
}
outcode_pattern = '[A-PR-UWYZ]([0-9]{1,2}|([A-HIK-Y][0-9](|[0-9]|[ABEHMNPRVWXY]))|[0-9][A-HJKSTUW])'
incode_pattern = '[0-9][ABD-HJLNP-UW-Z]{2}'
postcode_regex = re.compile(r'^(GIR 0AA|%s %s)$' % (outcode_pattern, incode_pattern))
space_regex = re.compile(r' *(%s)$' % incode_pattern)
def clean(self, value):
value = super(UKPostcodeField, self).clean(value)
if value == u'':
return value
postcode = value.upper().strip()
# Put a single space before the incode (second part).
postcode = self.space_regex.sub(r' \1', postcode)
if not self.postcode_regex.search(postcode):
raise ValidationError(self.default_error_messages['invalid'])
return postcode
class UKCountySelect(Select):
"""
A Select widget that uses a list of UK Counties/Regions as its choices.
"""
def __init__(self, attrs=None):
from uk_regions import UK_REGION_CHOICES
super(UKCountySelect, self).__init__(attrs, choices=UK_REGION_CHOICES)
class UKNationSelect(Select):
"""
A Select widget that uses a list of UK Nations as its choices.
"""
def __init__(self, attrs=None):
from uk_regions import UK_NATIONS_CHOICES
super(UKNationSelect, self).__init__(attrs, choices=UK_NATIONS_CHOICES)
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