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from django.core import formfields, template_loader, validators
from django.core import template
from django.core.extensions import DjangoContext as Context
from django.utils.httpwrappers import HttpResponse
from django.models.core import sites
from django.conf import settings
def template_validator(request):
"""
Displays the template validator form, which finds and displays template
syntax errors.
"""
# get a dict of {site_id : settings_module} for the validator
settings_modules = {}
for mod in settings.ADMIN_FOR:
settings_module = __import__(mod, '', '', [''])
settings_modules[settings_module.SITE_ID] = settings_module
manipulator = TemplateValidator(settings_modules)
new_data, errors = {}, {}
if request.POST:
new_data = request.POST.copy()
errors = manipulator.get_validation_errors(new_data)
if not errors:
request.user.add_message('The template is valid.')
t = template_loader.get_template('template_validator')
c = Context(request, {
'title': 'Template validator',
'form': formfields.FormWrapper(manipulator, new_data, errors),
})
return HttpResponse(t.render(c))
class TemplateValidator(formfields.Manipulator):
def __init__(self, settings_modules):
self.settings_modules = settings_modules
site_list = sites.get_in_bulk(settings_modules.keys()).values()
self.fields = (
formfields.SelectField('site', is_required=True, choices=[(s.id, s.name) for s in site_list]),
formfields.LargeTextField('template', is_required=True, rows=25, validator_list=[self.isValidTemplate]),
)
def isValidTemplate(self, field_data, all_data):
# get the settings module
# if the site isn't set, we don't raise an error since the site field will
try:
site_id = int(all_data.get('site', None))
except (ValueError, TypeError):
return
settings_module = self.settings_modules.get(site_id, None)
if settings_module is None:
return
# so that inheritance works in the site's context, register a new function
# for "extends" that uses the site's TEMPLATE_DIR instead
def new_do_extends(parser, token):
node = template_loader.do_extends(parser, token)
node.template_dirs = settings_module.TEMPLATE_DIRS
return node
template.register_tag('extends', new_do_extends)
# now validate the template using the new template dirs
# making sure to reset the extends function in any case
error = None
try:
tmpl = template_loader.get_template_from_string(field_data)
tmpl.render(template.Context({}))
except template.TemplateSyntaxError, e:
error = e
template.register_tag('extends', template_loader.do_extends)
if error:
raise validators.ValidationError, e.args
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