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""" |
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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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