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# Since this package contains a "django" module, this is required on Python 2.
from __future__ import absolute_import
import io
import string
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.template import TemplateDoesNotExist
from django.utils.html import conditional_escape
from .base import BaseEngine
from .utils import csrf_input_lazy, csrf_token_lazy
class TemplateStrings(BaseEngine):
app_dirname = 'template_strings'
def __init__(self, params):
params = params.copy()
options = params.pop('OPTIONS').copy()
if options:
raise ImproperlyConfigured(
"Unknown options: {}".format(", ".join(options)))
super(TemplateStrings, self).__init__(params)
def from_string(self, template_code):
return Template(template_code)
def get_template(self, template_name):
for template_file in self.iter_template_filenames(template_name):
try:
with io.open(template_file, encoding=settings.FILE_CHARSET) as fp:
template_code = fp.read()
except IOError:
continue
return Template(template_code)
else:
raise TemplateDoesNotExist(template_name)
class Template(string.Template):
def render(self, context=None, request=None):
if context is None:
context = {}
else:
context = {k: conditional_escape(v) for k, v in context.items()}
if request is not None:
context['csrf_input'] = csrf_input_lazy(request)
context['csrf_token'] = csrf_token_lazy(request)
return self.safe_substitute(context)
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