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import functools
import warnings
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.deprecation import RemovedInDjango60Warning
from django.utils.functional import cached_property
from django.utils.module_loading import import_string
@functools.lru_cache
def get_default_renderer():
renderer_class = import_string(settings.FORM_RENDERER)
return renderer_class()
class BaseRenderer:
form_template_name = "django/forms/div.html"
formset_template_name = "django/forms/formsets/div.html"
field_template_name = "django/forms/field.html"
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": [Path(__file__).parent / 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.
"""
@cached_property
def backend(self):
from django.template.backends.jinja2 import Jinja2
return Jinja2
# RemovedInDjango60Warning.
class DjangoDivFormRenderer(DjangoTemplates):
"""
Load Django templates from django/forms/templates and from apps'
'templates' directory and use the 'div.html' template to render forms and
formsets.
"""
def __init__(self, *args, **kwargs):
warnings.warn(
"The DjangoDivFormRenderer transitional form renderer is deprecated. Use "
"DjangoTemplates instead.",
RemovedInDjango60Warning,
)
super().__init__(*args, **kwargs)
# RemovedInDjango60Warning.
class Jinja2DivFormRenderer(Jinja2):
"""
Load Jinja2 templates from the built-in widget templates in
django/forms/jinja2 and from apps' 'jinja2' directory.
"""
def __init__(self, *args, **kwargs):
warnings.warn(
"The Jinja2DivFormRenderer transitional form renderer is deprecated. Use "
"Jinja2 instead.",
RemovedInDjango60Warning,
)
super().__init__(*args, **kwargs)
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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