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Name	Size	Permission
__pycache__	[ DIR ]	drwxr-xr-x
backends	[ DIR ]	drwxr-xr-x
loaders	[ DIR ]	drwxr-xr-x
__init__.py	1.96 KB	-rw-r--r--
autoreload.py	1.7 KB	-rw-r--r--
base.py	37.39 KB	-rw-r--r--
context.py	8.73 KB	-rw-r--r--
context_processors.py	2.35 KB	-rw-r--r--
defaultfilters.py	26.98 KB	-rw-r--r--
defaulttags.py	48.93 KB	-rw-r--r--
engine.py	6.72 KB	-rw-r--r--
exceptions.py	1.31 KB	-rw-r--r--
library.py	12.53 KB	-rw-r--r--
loader.py	2.01 KB	-rw-r--r--
loader_tags.py	12.5 KB	-rw-r--r--
response.py	5.33 KB	-rw-r--r--
smartif.py	6.26 KB	-rw-r--r--
utils.py	3.48 KB	-rw-r--r--

Code Editor : utils.py

import functools
from collections import Counter
from pathlib import Path

from django.apps import apps
from django.conf import settings
from django.core.exceptions import ImproperlyConfigured
from django.utils.functional import cached_property
from django.utils.module_loading import import_string

class InvalidTemplateEngineError(ImproperlyConfigured):
    pass

class EngineHandler:
    def __init__(self, templates=None):
        """
        templates is an optional list of template engine definitions
        (structured like settings.TEMPLATES).
        """
        self._templates = templates
        self._engines = {}

@cached_property
    def templates(self):
        if self._templates is None:
            self._templates = settings.TEMPLATES

templates = {}
        backend_names = []
        for tpl in self._templates:
            try:
                # This will raise an exception if 'BACKEND' doesn't exist or
                # isn't a string containing at least one dot.
                default_name = tpl['BACKEND'].rsplit('.', 2)[-2]
            except Exception:
                invalid_backend = tpl.get('BACKEND', '<not defined>')
                raise ImproperlyConfigured(
                    "Invalid BACKEND for a template engine: {}. Check "
                    "your TEMPLATES setting.".format(invalid_backend))

tpl = {
                'NAME': default_name,
                'DIRS': [],
                'APP_DIRS': False,
                'OPTIONS': {},
                **tpl,
            }

templates[tpl['NAME']] = tpl
            backend_names.append(tpl['NAME'])

counts = Counter(backend_names)
        duplicates = [alias for alias, count in counts.most_common() if count > 1]
        if duplicates:
            raise ImproperlyConfigured(
                "Template engine aliases aren't unique, duplicates: {}. "
                "Set a unique NAME for each engine in settings.TEMPLATES."
                .format(", ".join(duplicates)))

return templates

def __getitem__(self, alias):
        try:
            return self._engines[alias]
        except KeyError:
            try:
                params = self.templates[alias]
            except KeyError:
                raise InvalidTemplateEngineError(
                    "Could not find config for '{}' "
                    "in settings.TEMPLATES".format(alias))

# If importing or initializing the backend raises an exception,
            # self._engines[alias] isn't set and this code may get executed
            # again, so we must preserve the original params. See #24265.
            params = params.copy()
            backend = params.pop('BACKEND')
            engine_cls = import_string(backend)
            engine = engine_cls(params)

self._engines[alias] = engine
            return engine

def __iter__(self):
        return iter(self.templates)

def all(self):
        return [self[alias] for alias in self]

@functools.lru_cache()
def get_app_template_dirs(dirname):
    """
    Return an iterable of paths of directories to load app templates from.

dirname is the name of the subdirectory containing templates inside
    installed applications.
    """
    template_dirs = [
        Path(app_config.path) / dirname
        for app_config in apps.get_app_configs()
        if app_config.path and (Path(app_config.path) / dirname).is_dir()
    ]
    # Immutable return value because it will be cached and shared by callers.
    return tuple(template_dirs)

${this.title}

Code Editor : utils.py