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"""
Tagging components for Django's ``newforms`` form library.
"""
from django import newforms as forms
from django.utils.translation import ugettext as _
from tagging import settings
from tagging.utils import parse_tag_input
class TagField(forms.CharField):
"""
A ``CharField`` which validates that its input is a valid list of
tag names.
"""
def clean(self, value):
value = super(TagField, self).clean(value)
if value == u'':
return value
for tag_name in parse_tag_input(value):
if len(tag_name) > settings.MAX_TAG_LENGTH:
raise forms.ValidationError(
_('Each tag may be no more than %s characters long.') % settings.MAX_TAG_LENGTH)
return value
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