+
−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.translation import ugettext_lazy as _
+
−
+
−
+
−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
+
−    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():
+
−            request.user.message_set.create(message='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