from django import template,forms
from django.contrib.admin.views.decorators import staff_member_required
from django.template import loader
from django.shortcuts import render_to_response
from django.contrib.sites.models import Site
from django.conf import settings
from django.utils.importlib import import_module
from django.utils.translation import ugettext_lazy
from django.contrib import messages
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_module(mod)
settings_modules[settings_module.SITE_ID] = settings_module
site_list = Site.objects.in_bulk(settings_modules.keys()).values()
if request.POST:
form = TemplateValidatorForm(settings_modules, site_list,
data=request.POST)
if form.is_valid():
messages.info(request, 'The template is valid.')
else:
form = TemplateValidatorForm(settings_modules, site_list)
return render_to_response('admin/template_validator.html', {
'title': 'Template validator',
'form': form,
}, context_instance=template.RequestContext(request))
template_validator = staff_member_required(template_validator)
class TemplateValidatorForm(forms.Form):
site = forms.ChoiceField(_('site'))
template = forms.CharField(
_('template'), widget=forms.Textarea({'rows': 25, 'cols': 80}))
def __init__(self, settings_modules, site_list, *args, **kwargs):
self.settings_modules = settings_modules
super(TemplateValidatorForm, self).__init__(*args, **kwargs)
self.fields['site'].choices = [(s.id, s.name) for s in site_list]
def clean_template(self):
# 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(self.cleaned_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_DIRS instead.
def new_do_extends(parser, token):
node = loader.do_extends(parser, token)
node.template_dirs = settings_module.TEMPLATE_DIRS
return node
register = template.Library()
register.tag('extends', new_do_extends)
template.builtins.append(register)
# Now validate the template using the new TEMPLATE_DIRS, making sure to
# reset the extends function in any case.
error = None
template_string = self.cleaned_data['template']
try:
tmpl = loader.get_template_from_string(template_string)
tmpl.render(template.Context({}))
except template.TemplateSyntaxError, e:
error = e
template.builtins.remove(register)
if error:
raise forms.ValidationError(e.args)
|