96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
"""
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Chile specific form helpers.
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"""
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from django.core.validators import EMPTY_VALUES
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from django.forms import ValidationError
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from django.forms.fields import RegexField, Select
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from django.utils.translation import ugettext_lazy as _
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from django.utils.encoding import smart_unicode
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class CLRegionSelect(Select):
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"""
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A Select widget that uses a list of Chilean Regions (Regiones)
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as its choices.
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"""
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def __init__(self, attrs=None):
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from cl_regions import REGION_CHOICES
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super(CLRegionSelect, self).__init__(attrs, choices=REGION_CHOICES)
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class CLRutField(RegexField):
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"""
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Chilean "Rol Unico Tributario" (RUT) field. This is the Chilean national
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identification number.
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Samples for testing are available from
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https://palena.sii.cl/cvc/dte/ee_empresas_emisoras.html
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"""
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default_error_messages = {
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'invalid': _('Enter a valid Chilean RUT.'),
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'strict': _('Enter a valid Chilean RUT. The format is XX.XXX.XXX-X.'),
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'checksum': _('The Chilean RUT is not valid.'),
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}
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def __init__(self, *args, **kwargs):
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if 'strict' in kwargs:
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del kwargs['strict']
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super(CLRutField, self).__init__(r'^(\d{1,2}\.)?\d{3}\.\d{3}-[\dkK]$',
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error_message=self.default_error_messages['strict'], *args, **kwargs)
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else:
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# In non-strict mode, accept RUTs that validate but do not exist in
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# the real world.
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super(CLRutField, self).__init__(r'^[\d\.]{1,11}-?[\dkK]$', *args, **kwargs)
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def clean(self, value):
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"""
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Check and clean the Chilean RUT.
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"""
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super(CLRutField, self).clean(value)
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if value in EMPTY_VALUES:
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return u''
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rut, verificador = self._canonify(value)
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if self._algorithm(rut) == verificador:
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return self._format(rut, verificador)
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else:
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raise ValidationError(self.error_messages['checksum'])
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def _algorithm(self, rut):
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"""
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Takes RUT in pure canonical form, calculates the verifier digit.
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"""
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suma = 0
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multi = 2
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for r in rut[::-1]:
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suma += int(r) * multi
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multi += 1
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if multi == 8:
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multi = 2
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return u'0123456789K0'[11 - suma % 11]
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def _canonify(self, rut):
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"""
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Turns the RUT into one normalized format. Returns a (rut, verifier)
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tuple.
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"""
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rut = smart_unicode(rut).replace(' ', '').replace('.', '').replace('-', '')
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return rut[:-1], rut[-1]
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def _format(self, code, verifier=None):
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"""
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Formats the RUT from canonical form to the common string representation.
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If verifier=None, then the last digit in 'code' is the verifier.
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"""
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if verifier is None:
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verifier = code[-1]
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code = code[:-1]
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while len(code) > 3 and '.' not in code[:3]:
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pos = code.find('.')
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if pos == -1:
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new_dot = -3
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else:
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new_dot = pos - 3
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code = code[:new_dot] + '.' + code[new_dot:]
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return u'%s-%s' % (code, verifier)
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