import functools from pathlib import Path from django.conf import settings from django.template.backends.django import DjangoTemplates from django.template.loader import get_template from django.utils.functional import cached_property from django.utils.module_loading import import_string try: from django.template.backends.jinja2 import Jinja2 except ImportError: def Jinja2(params): raise ImportError("jinja2 isn't installed") ROOT = Path(__file__).parent @functools.lru_cache() def get_default_renderer(): renderer_class = import_string(settings.FORM_RENDERER) return renderer_class() class BaseRenderer: def get_template(self, template_name): raise NotImplementedError('subclasses must implement get_template()') def render(self, template_name, context, request=None): template = self.get_template(template_name) return template.render(context, request=request).strip() class EngineMixin: def get_template(self, template_name): return self.engine.get_template(template_name) @cached_property def engine(self): return self.backend({ 'APP_DIRS': True, 'DIRS': [str(ROOT / self.backend.app_dirname)], 'NAME': 'djangoforms', 'OPTIONS': {}, }) class DjangoTemplates(EngineMixin, BaseRenderer): """ Load Django templates from the built-in widget templates in django/forms/templates and from apps' 'templates' directory. """ backend = DjangoTemplates class Jinja2(EngineMixin, BaseRenderer): """ Load Jinja2 templates from the built-in widget templates in django/forms/jinja2 and from apps' 'jinja2' directory. """ backend = Jinja2 class TemplatesSetting(BaseRenderer): """ Load templates using template.loader.get_template() which is configured based on settings.TEMPLATES. """ def get_template(self, template_name): return get_template(template_name)