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import os
from django.conf import settings
from django.template.backends.django import DjangoTemplates
from django.template.loader import get_template
from django.utils import lru_cache
from django.utils._os import upath
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 = upath(os.path.dirname(__file__))
@lru_cache.lru_cache()
def get_default_renderer():
renderer_class = import_string(settings.FORM_RENDERER)
return renderer_class()
class BaseRenderer(object):
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(object):
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': [os.path.join(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)
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