1 """

     2 Tagging components for Django's form library.

     3 """

     4 from django import forms

     5 from django.utils.translation import ugettext as _

     6 

     7 from tagging import settings

     8 from tagging.models import Tag

     9 from tagging.utils import parse_tag_input

    10 

    11 class TagAdminForm(forms.ModelForm):

    12     class Meta:

    13         model = Tag

    14 

    15     def clean_name(self):

    16         value = self.cleaned_data['name']

    17         tag_names = parse_tag_input(value)

    18         if len(tag_names) > 1:

    19             raise forms.ValidationError(_('Multiple tags were given.'))

    20         elif len(tag_names[0]) > settings.MAX_TAG_LENGTH:

    21             raise forms.ValidationError(

    22                 _('A tag may be no more than %s characters long.') %

    23                     settings.MAX_TAG_LENGTH)

    24         return value

    25 

    26 class TagField(forms.CharField):

    27     """

    28     A ``CharField`` which validates that its input is a valid list of

    29     tag names.

    30     """

    31     def clean(self, value):

    32         value = super(TagField, self).clean(value)

    33         if value == u'':

    34             return value

    35         for tag_name in parse_tag_input(value):

    36             if len(tag_name) > settings.MAX_TAG_LENGTH:

    37                 raise forms.ValidationError(

    38                     _('Each tag may be no more than %s characters long.') %

    39                         settings.MAX_TAG_LENGTH)

    40         return value