text: # -*- coding: utf-8 -*-
  """
  PE-specific Form helpers.
  """
  
  from django.newforms import ValidationError
  from django.newforms.fields import RegexField, CharField, Select, EMPTY_VALUES
  from django.utils.translation import ugettext
  
  class PEDepartmentSelect(Select):
      """
      A Select widget that uses a list of Peruvian Departments as its choices.
      """
      def __init__(self, attrs=None):
          from pe_department import DEPARTMENT_CHOICES
          super(PEDepartmentSelect, self).__init__(attrs, choices=DEPARTMENT_CHOICES)
  
  class PEDNIField(CharField):
      """
      A field that validates `Documento Nacional de IdentidadŽ (DNI) numbers.
      """
      default_error_messages = {
          'invalid': ugettext("This field requires only numbers."),
          'max_digits': ugettext("This field requires 8 digits."),
      }
  
      def __init__(self, *args, **kwargs):
          super(PEDNIField, self).__init__(max_length=8, min_length=8, *args,
                  **kwargs)
  
      def clean(self, value):
          """
          Value must be a string in the XXXXXXXX formats.
          """
          value = super(PEDNIField, self).clean(value)
          if value in EMPTY_VALUES:
              return u''
          if not value.isdigit():
              raise ValidationError(self.error_messages['invalid'])
          if len(value) != 8:
              raise ValidationError(self.error_messages['max_digits'])
  
          return value
  
  class PERUCField(RegexField):
      """
      This field validates a RUC (Registro Unico de Contribuyentes). A RUC is of
      the form XXXXXXXXXXX.
      """
      default_error_messages = {
          'invalid': ugettext("This field requires only numbers."),
          'max_digits': ugettext("This field requires 11 digits."),
      }
  
      def __init__(self, *args, **kwargs):
          super(PERUCField, self).__init__(max_length=11, min_length=11, *args,
              **kwargs)
  
      def clean(self, value):
          """
          Value must be an 11-digit number.
          """
          value = super(PERUCField, self).clean(value)
          if value in EMPTY_VALUES:
              return u''
          if not value.isdigit():
              raise ValidationError(self.error_messages['invalid'])
          if len(value) != 11:
              raise ValidationError(self.error_messages['max_digits'])
          return value
  
  