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9ee693bd6c
Deferred accessing the module-global variable __file__ because the Python import API does not guarantee it always exists—in particular, it does not exist in certain "frozen" environments. The following changes advanced this goal. Thanks to Carlton Gibson, Tom Forbes, Mariusz Felisiak, and Shreyas Ravi for review and feedback.
66 lines
1.9 KiB
Python
66 lines
1.9 KiB
Python
import functools
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from pathlib import Path
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from django.conf import settings
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from django.template.backends.django import DjangoTemplates
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from django.template.loader import get_template
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from django.utils.functional import cached_property
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from django.utils.module_loading import import_string
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@functools.lru_cache()
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def get_default_renderer():
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renderer_class = import_string(settings.FORM_RENDERER)
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return renderer_class()
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class BaseRenderer:
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def get_template(self, template_name):
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raise NotImplementedError('subclasses must implement get_template()')
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def render(self, template_name, context, request=None):
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template = self.get_template(template_name)
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return template.render(context, request=request).strip()
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class EngineMixin:
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def get_template(self, template_name):
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return self.engine.get_template(template_name)
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@cached_property
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def engine(self):
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return self.backend({
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'APP_DIRS': True,
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'DIRS': [Path(__file__).parent / self.backend.app_dirname],
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'NAME': 'djangoforms',
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'OPTIONS': {},
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})
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class DjangoTemplates(EngineMixin, BaseRenderer):
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"""
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Load Django templates from the built-in widget templates in
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django/forms/templates and from apps' 'templates' directory.
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"""
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backend = DjangoTemplates
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class Jinja2(EngineMixin, BaseRenderer):
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"""
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Load Jinja2 templates from the built-in widget templates in
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django/forms/jinja2 and from apps' 'jinja2' directory.
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"""
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@cached_property
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def backend(self):
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from django.template.backends.jinja2 import Jinja2
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return Jinja2
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class TemplatesSetting(BaseRenderer):
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"""
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Load templates using template.loader.get_template() which is configured
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based on settings.TEMPLATES.
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"""
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def get_template(self, template_name):
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return get_template(template_name)
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