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venv/lib/python3.7/site-packages/django/template/__init__.py

@@ -0,0 +1,68 @@
+"""
+Django's support for templates.
+
+The django.template namespace contains two independent subsystems:
+
+1. Multiple Template Engines: support for pluggable template backends,
+   built-in backends and backend-independent APIs
+2. Django Template Language: Django's own template engine, including its
+   built-in loaders, context processors, tags and filters.
+
+Ideally these subsystems would be implemented in distinct packages. However
+keeping them together made the implementation of Multiple Template Engines
+less disruptive .
+
+Here's a breakdown of which modules belong to which subsystem.
+
+Multiple Template Engines:
+
+- django.template.backends.*
+- django.template.loader
+- django.template.response
+
+Django Template Language:
+
+- django.template.base
+- django.template.context
+- django.template.context_processors
+- django.template.loaders.*
+- django.template.debug
+- django.template.defaultfilters
+- django.template.defaulttags
+- django.template.engine
+- django.template.loader_tags
+- django.template.smartif
+
+Shared:
+
+- django.template.utils
+
+"""
+
+# Multiple Template Engines
+
+from .engine import Engine
+from .utils import EngineHandler
+
+engines = EngineHandler()
+
+__all__ = ('Engine', 'engines')
+
+
+# Django Template Language
+
+# Public exceptions
+from .base import VariableDoesNotExist                                  # NOQA isort:skip
+from .context import ContextPopException                                # NOQA isort:skip
+from .exceptions import TemplateDoesNotExist, TemplateSyntaxError       # NOQA isort:skip
+
+# Template parts
+from .base import (                                                     # NOQA isort:skip
+    Context, Node, NodeList, Origin, RequestContext, Template, Variable,
+)
+
+# Library management
+from .library import Library                                            # NOQA isort:skip
+
+
+__all__ += ('Template', 'Context', 'RequestContext')

venv/lib/python3.7/site-packages/django/template/backends/base.py

@@ -0,0 +1,81 @@
+from django.core.exceptions import (
+    ImproperlyConfigured, SuspiciousFileOperation,
+)
+from django.template.utils import get_app_template_dirs
+from django.utils._os import safe_join
+from django.utils.functional import cached_property
+
+
+class BaseEngine:
+
+    # Core methods: engines have to provide their own implementation
+    #               (except for from_string which is optional).
+
+    def __init__(self, params):
+        """
+        Initialize the template engine.
+
+        `params` is a dict of configuration settings.
+        """
+        params = params.copy()
+        self.name = params.pop('NAME')
+        self.dirs = list(params.pop('DIRS'))
+        self.app_dirs = params.pop('APP_DIRS')
+        if params:
+            raise ImproperlyConfigured(
+                "Unknown parameters: {}".format(", ".join(params)))
+
+    @property
+    def app_dirname(self):
+        raise ImproperlyConfigured(
+            "{} doesn't support loading templates from installed "
+            "applications.".format(self.__class__.__name__))
+
+    def from_string(self, template_code):
+        """
+        Create and return a template for the given source code.
+
+        This method is optional.
+        """
+        raise NotImplementedError(
+            "subclasses of BaseEngine should provide "
+            "a from_string() method")
+
+    def get_template(self, template_name):
+        """
+        Load and return a template for the given name.
+
+        Raise TemplateDoesNotExist if no such template exists.
+        """
+        raise NotImplementedError(
+            "subclasses of BaseEngine must provide "
+            "a get_template() method")
+
+    # Utility methods: they are provided to minimize code duplication and
+    #                  security issues in third-party backends.
+
+    @cached_property
+    def template_dirs(self):
+        """
+        Return a list of directories to search for templates.
+        """
+        # Immutable return value because it's cached and shared by callers.
+        template_dirs = tuple(self.dirs)
+        if self.app_dirs:
+            template_dirs += get_app_template_dirs(self.app_dirname)
+        return template_dirs
+
+    def iter_template_filenames(self, template_name):
+        """
+        Iterate over candidate files for template_name.
+
+        Ignore files that don't lie inside configured template dirs to avoid
+        directory traversal attacks.
+        """
+        for template_dir in self.template_dirs:
+            try:
+                yield safe_join(template_dir, template_name)
+            except SuspiciousFileOperation:
+                # The joined path was located outside of this template_dir
+                # (it might be inside another one, so this isn't fatal).
+                pass

venv/lib/python3.7/site-packages/django/template/backends/django.py

@@ -0,0 +1,129 @@
+from importlib import import_module
+from pkgutil import walk_packages
+
+from django.apps import apps
+from django.conf import settings
+from django.template import TemplateDoesNotExist
+from django.template.context import make_context
+from django.template.engine import Engine
+from django.template.library import InvalidTemplateLibrary
+
+from .base import BaseEngine
+
+
+class DjangoTemplates(BaseEngine):
+
+    app_dirname = 'templates'
+
+    def __init__(self, params):
+        params = params.copy()
+        options = params.pop('OPTIONS').copy()
+        options.setdefault('autoescape', True)
+        options.setdefault('debug', settings.DEBUG)
+        options.setdefault('file_charset', settings.FILE_CHARSET)
+        libraries = options.get('libraries', {})
+        options['libraries'] = self.get_templatetag_libraries(libraries)
+        super().__init__(params)
+        self.engine = Engine(self.dirs, self.app_dirs, **options)
+
+    def from_string(self, template_code):
+        return Template(self.engine.from_string(template_code), self)
+
+    def get_template(self, template_name):
+        try:
+            return Template(self.engine.get_template(template_name), self)
+        except TemplateDoesNotExist as exc:
+            reraise(exc, self)
+
+    def get_templatetag_libraries(self, custom_libraries):
+        """
+        Return a collation of template tag libraries from installed
+        applications and the supplied custom_libraries argument.
+        """
+        libraries = get_installed_libraries()
+        libraries.update(custom_libraries)
+        return libraries
+
+
+class Template:
+
+    def __init__(self, template, backend):
+        self.template = template
+        self.backend = backend
+
+    @property
+    def origin(self):
+        return self.template.origin
+
+    def render(self, context=None, request=None):
+        context = make_context(context, request, autoescape=self.backend.engine.autoescape)
+        try:
+            return self.template.render(context)
+        except TemplateDoesNotExist as exc:
+            reraise(exc, self.backend)
+
+
+def copy_exception(exc, backend=None):
+    """
+    Create a new TemplateDoesNotExist. Preserve its declared attributes and
+    template debug data but discard __traceback__, __context__, and __cause__
+    to make this object suitable for keeping around (in a cache, for example).
+    """
+    backend = backend or exc.backend
+    new = exc.__class__(*exc.args, tried=exc.tried, backend=backend, chain=exc.chain)
+    if hasattr(exc, 'template_debug'):
+        new.template_debug = exc.template_debug
+    return new
+
+
+def reraise(exc, backend):
+    """
+    Reraise TemplateDoesNotExist while maintaining template debug information.
+    """
+    new = copy_exception(exc, backend)
+    raise new from exc
+
+
+def get_installed_libraries():
+    """
+    Return the built-in template tag libraries and those from installed
+    applications. Libraries are stored in a dictionary where keys are the
+    individual module names, not the full module paths. Example:
+    django.templatetags.i18n is stored as i18n.
+    """
+    libraries = {}
+    candidates = ['django.templatetags']
+    candidates.extend(
+        '%s.templatetags' % app_config.name
+        for app_config in apps.get_app_configs())
+
+    for candidate in candidates:
+        try:
+            pkg = import_module(candidate)
+        except ImportError:
+            # No templatetags package defined. This is safe to ignore.
+            continue
+
+        if hasattr(pkg, '__path__'):
+            for name in get_package_libraries(pkg):
+                libraries[name[len(candidate) + 1:]] = name
+
+    return libraries
+
+
+def get_package_libraries(pkg):
+    """
+    Recursively yield template tag libraries defined in submodules of a
+    package.
+    """
+    for entry in walk_packages(pkg.__path__, pkg.__name__ + '.'):
+        try:
+            module = import_module(entry[1])
+        except ImportError as e:
+            raise InvalidTemplateLibrary(
+                "Invalid template library specified. ImportError raised when "
+                "trying to load '%s': %s" % (entry[1], e)
+            )
+
+        if hasattr(module, 'register'):
+            yield entry[1]

venv/lib/python3.7/site-packages/django/template/backends/jinja2.py

@@ -0,0 +1,108 @@
+import jinja2
+
+from django.conf import settings
+from django.template import TemplateDoesNotExist, TemplateSyntaxError
+from django.utils.functional import cached_property
+from django.utils.module_loading import import_string
+
+from .base import BaseEngine
+
+
+class Jinja2(BaseEngine):
+
+    app_dirname = 'jinja2'
+
+    def __init__(self, params):
+        params = params.copy()
+        options = params.pop('OPTIONS').copy()
+        super().__init__(params)
+
+        self.context_processors = options.pop('context_processors', [])
+
+        environment = options.pop('environment', 'jinja2.Environment')
+        environment_cls = import_string(environment)
+
+        if 'loader' not in options:
+            options['loader'] = jinja2.FileSystemLoader(self.template_dirs)
+        options.setdefault('autoescape', True)
+        options.setdefault('auto_reload', settings.DEBUG)
+        options.setdefault('undefined',
+                           jinja2.DebugUndefined if settings.DEBUG else jinja2.Undefined)
+
+        self.env = environment_cls(**options)
+
+    def from_string(self, template_code):
+        return Template(self.env.from_string(template_code), self)
+
+    def get_template(self, template_name):
+        try:
+            return Template(self.env.get_template(template_name), self)
+        except jinja2.TemplateNotFound as exc:
+            raise TemplateDoesNotExist(exc.name, backend=self) from exc
+        except jinja2.TemplateSyntaxError as exc:
+            new = TemplateSyntaxError(exc.args)
+            new.template_debug = get_exception_info(exc)
+            raise new from exc
+
+    @cached_property
+    def template_context_processors(self):
+        return [import_string(path) for path in self.context_processors]
+
+
+class Template:
+
+    def __init__(self, template, backend):
+        self.template = template
+        self.backend = backend
+        self.origin = Origin(
+            name=template.filename, template_name=template.name,
+        )
+
+    def render(self, context=None, request=None):
+        from .utils import csrf_input_lazy, csrf_token_lazy
+        if context is None:
+            context = {}
+        if request is not None:
+            context['request'] = request
+            context['csrf_input'] = csrf_input_lazy(request)
+            context['csrf_token'] = csrf_token_lazy(request)
+            for context_processor in self.backend.template_context_processors:
+                context.update(context_processor(request))
+        return self.template.render(context)
+
+
+class Origin:
+    """
+    A container to hold debug information as described in the template API
+    documentation.
+    """
+    def __init__(self, name, template_name):
+        self.name = name
+        self.template_name = template_name
+
+
+def get_exception_info(exception):
+    """
+    Format exception information for display on the debug page using the
+    structure described in the template API documentation.
+    """
+    context_lines = 10
+    lineno = exception.lineno
+    lines = list(enumerate(exception.source.strip().split("\n"), start=1))
+    during = lines[lineno - 1][1]
+    total = len(lines)
+    top = max(0, lineno - context_lines - 1)
+    bottom = min(total, lineno + context_lines)
+
+    return {
+        'name': exception.filename,
+        'message': exception.message,
+        'source_lines': lines[top:bottom],
+        'line': lineno,
+        'before': '',
+        'during': during,
+        'after': '',
+        'total': total,
+        'top': top,
+        'bottom': bottom,
+    }

venv/lib/python3.7/site-packages/django/template/backends/utils.py

@@ -0,0 +1,14 @@
+from django.middleware.csrf import get_token
+from django.utils.functional import lazy
+from django.utils.html import format_html
+from django.utils.safestring import SafeText
+
+
+def csrf_input(request):
+    return format_html(
+        '<input type="hidden" name="csrfmiddlewaretoken" value="{}">',
+        get_token(request))
+
+
+csrf_input_lazy = lazy(csrf_input, SafeText, str)
+csrf_token_lazy = lazy(get_token, str)

venv/lib/python3.7/site-packages/django/template/context.py

@@ -0,0 +1,280 @@
+from contextlib import contextmanager
+from copy import copy
+
+# Hard-coded processor for easier use of CSRF protection.
+_builtin_context_processors = ('django.template.context_processors.csrf',)
+
+
+class ContextPopException(Exception):
+    "pop() has been called more times than push()"
+    pass
+
+
+class ContextDict(dict):
+    def __init__(self, context, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        context.dicts.append(self)
+        self.context = context
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, *args, **kwargs):
+        self.context.pop()
+
+
+class BaseContext:
+    def __init__(self, dict_=None):
+        self._reset_dicts(dict_)
+
+    def _reset_dicts(self, value=None):
+        builtins = {'True': True, 'False': False, 'None': None}
+        self.dicts = [builtins]
+        if value is not None:
+            self.dicts.append(value)
+
+    def __copy__(self):
+        duplicate = copy(super())
+        duplicate.dicts = self.dicts[:]
+        return duplicate
+
+    def __repr__(self):
+        return repr(self.dicts)
+
+    def __iter__(self):
+        return reversed(self.dicts)
+
+    def push(self, *args, **kwargs):
+        dicts = []
+        for d in args:
+            if isinstance(d, BaseContext):
+                dicts += d.dicts[1:]
+            else:
+                dicts.append(d)
+        return ContextDict(self, *dicts, **kwargs)
+
+    def pop(self):
+        if len(self.dicts) == 1:
+            raise ContextPopException
+        return self.dicts.pop()
+
+    def __setitem__(self, key, value):
+        "Set a variable in the current context"
+        self.dicts[-1][key] = value
+
+    def set_upward(self, key, value):
+        """
+        Set a variable in one of the higher contexts if it exists there,
+        otherwise in the current context.
+        """
+        context = self.dicts[-1]
+        for d in reversed(self.dicts):
+            if key in d:
+                context = d
+                break
+        context[key] = value
+
+    def __getitem__(self, key):
+        "Get a variable's value, starting at the current context and going upward"
+        for d in reversed(self.dicts):
+            if key in d:
+                return d[key]
+        raise KeyError(key)
+
+    def __delitem__(self, key):
+        "Delete a variable from the current context"
+        del self.dicts[-1][key]
+
+    def __contains__(self, key):
+        return any(key in d for d in self.dicts)
+
+    def get(self, key, otherwise=None):
+        for d in reversed(self.dicts):
+            if key in d:
+                return d[key]
+        return otherwise
+
+    def setdefault(self, key, default=None):
+        try:
+            return self[key]
+        except KeyError:
+            self[key] = default
+        return default
+
+    def new(self, values=None):
+        """
+        Return a new context with the same properties, but with only the
+        values given in 'values' stored.
+        """
+        new_context = copy(self)
+        new_context._reset_dicts(values)
+        return new_context
+
+    def flatten(self):
+        """
+        Return self.dicts as one dictionary.
+        """
+        flat = {}
+        for d in self.dicts:
+            flat.update(d)
+        return flat
+
+    def __eq__(self, other):
+        """
+        Compare two contexts by comparing theirs 'dicts' attributes.
+        """
+        return (
+            isinstance(other, BaseContext) and
+            # because dictionaries can be put in different order
+            # we have to flatten them like in templates
+            self.flatten() == other.flatten()
+        )
+
+
+class Context(BaseContext):
+    "A stack container for variable context"
+    def __init__(self, dict_=None, autoescape=True, use_l10n=None, use_tz=None):
+        self.autoescape = autoescape
+        self.use_l10n = use_l10n
+        self.use_tz = use_tz
+        self.template_name = "unknown"
+        self.render_context = RenderContext()
+        # Set to the original template -- as opposed to extended or included
+        # templates -- during rendering, see bind_template.
+        self.template = None
+        super().__init__(dict_)
+
+    @contextmanager
+    def bind_template(self, template):
+        if self.template is not None:
+            raise RuntimeError("Context is already bound to a template")
+        self.template = template
+        try:
+            yield
+        finally:
+            self.template = None
+
+    def __copy__(self):
+        duplicate = super().__copy__()
+        duplicate.render_context = copy(self.render_context)
+        return duplicate
+
+    def update(self, other_dict):
+        "Push other_dict to the stack of dictionaries in the Context"
+        if not hasattr(other_dict, '__getitem__'):
+            raise TypeError('other_dict must be a mapping (dictionary-like) object.')
+        if isinstance(other_dict, BaseContext):
+            other_dict = other_dict.dicts[1:].pop()
+        return ContextDict(self, other_dict)
+
+
+class RenderContext(BaseContext):
+    """
+    A stack container for storing Template state.
+
+    RenderContext simplifies the implementation of template Nodes by providing a
+    safe place to store state between invocations of a node's `render` method.
+
+    The RenderContext also provides scoping rules that are more sensible for
+    'template local' variables. The render context stack is pushed before each
+    template is rendered, creating a fresh scope with nothing in it. Name
+    resolution fails if a variable is not found at the top of the RequestContext
+    stack. Thus, variables are local to a specific template and don't affect the
+    rendering of other templates as they would if they were stored in the normal
+    template context.
+    """
+    template = None
+
+    def __iter__(self):
+        yield from self.dicts[-1]
+
+    def __contains__(self, key):
+        return key in self.dicts[-1]
+
+    def get(self, key, otherwise=None):
+        return self.dicts[-1].get(key, otherwise)
+
+    def __getitem__(self, key):
+        return self.dicts[-1][key]
+
+    @contextmanager
+    def push_state(self, template, isolated_context=True):
+        initial = self.template
+        self.template = template
+        if isolated_context:
+            self.push()
+        try:
+            yield
+        finally:
+            self.template = initial
+            if isolated_context:
+                self.pop()
+
+
+class RequestContext(Context):
+    """
+    This subclass of template.Context automatically populates itself using
+    the processors defined in the engine's configuration.
+    Additional processors can be specified as a list of callables
+    using the "processors" keyword argument.
+    """
+    def __init__(self, request, dict_=None, processors=None, use_l10n=None, use_tz=None, autoescape=True):
+        super().__init__(dict_, use_l10n=use_l10n, use_tz=use_tz, autoescape=autoescape)
+        self.request = request
+        self._processors = () if processors is None else tuple(processors)
+        self._processors_index = len(self.dicts)
+
+        # placeholder for context processors output
+        self.update({})
+
+        # empty dict for any new modifications
+        # (so that context processors don't overwrite them)
+        self.update({})
+
+    @contextmanager
+    def bind_template(self, template):
+        if self.template is not None:
+            raise RuntimeError("Context is already bound to a template")
+
+        self.template = template
+        # Set context processors according to the template engine's settings.
+        processors = (template.engine.template_context_processors +
+                      self._processors)
+        updates = {}
+        for processor in processors:
+            updates.update(processor(self.request))
+        self.dicts[self._processors_index] = updates
+
+        try:
+            yield
+        finally:
+            self.template = None
+            # Unset context processors.
+            self.dicts[self._processors_index] = {}
+
+    def new(self, values=None):
+        new_context = super().new(values)
+        # This is for backwards-compatibility: RequestContexts created via
+        # Context.new don't include values from context processors.
+        if hasattr(new_context, '_processors_index'):
+            del new_context._processors_index
+        return new_context
+
+
+def make_context(context, request=None, **kwargs):
+    """
+    Create a suitable Context from a plain dict and optionally an HttpRequest.
+    """
+    if context is not None and not isinstance(context, dict):
+        raise TypeError('context must be a dict rather than %s.' % context.__class__.__name__)
+    if request is None:
+        context = Context(context, **kwargs)
+    else:
+        # The following pattern is required to ensure values from
+        # context override those from template context processors.
+        original_context = context
+        context = RequestContext(request, **kwargs)
+        if original_context:
+            context.push(original_context)
+    return context

venv/lib/python3.7/site-packages/django/template/loaders/base.py

@@ -0,0 +1,49 @@
+from django.template import Template, TemplateDoesNotExist
+
+
+class Loader:
+
+    def __init__(self, engine):
+        self.engine = engine
+
+    def get_template(self, template_name, skip=None):
+        """
+        Call self.get_template_sources() and return a Template object for
+        the first template matching template_name. If skip is provided, ignore
+        template origins in skip. This is used to avoid recursion during
+        template extending.
+        """
+        tried = []
+
+        for origin in self.get_template_sources(template_name):
+            if skip is not None and origin in skip:
+                tried.append((origin, 'Skipped'))
+                continue
+
+            try:
+                contents = self.get_contents(origin)
+            except TemplateDoesNotExist:
+                tried.append((origin, 'Source does not exist'))
+                continue
+            else:
+                return Template(
+                    contents, origin, origin.template_name, self.engine,
+                )
+
+        raise TemplateDoesNotExist(template_name, tried=tried)
+
+    def get_template_sources(self, template_name):
+        """
+        An iterator that yields possible matching template paths for a
+        template name.
+        """
+        raise NotImplementedError(
+            'subclasses of Loader must provide a get_template_sources() method'
+        )
+
+    def reset(self):
+        """
+        Reset any state maintained by the loader instance (e.g. cached
+        templates or cached loader modules).
+        """
+        pass

venv/lib/python3.7/site-packages/django/template/loaders/filesystem.py

@@ -0,0 +1,46 @@
+"""
+Wrapper for loading templates from the filesystem.
+"""
+
+from django.core.exceptions import SuspiciousFileOperation
+from django.template import Origin, TemplateDoesNotExist
+from django.utils._os import safe_join
+
+from .base import Loader as BaseLoader
+
+
+class Loader(BaseLoader):
+
+    def __init__(self, engine, dirs=None):
+        super().__init__(engine)
+        self.dirs = dirs
+
+    def get_dirs(self):
+        return self.dirs if self.dirs is not None else self.engine.dirs
+
+    def get_contents(self, origin):
+        try:
+            with open(origin.name, encoding=self.engine.file_charset) as fp:
+                return fp.read()
+        except FileNotFoundError:
+            raise TemplateDoesNotExist(origin)
+
+    def get_template_sources(self, template_name):
+        """
+        Return an Origin object pointing to an absolute path in each directory
+        in template_dirs. For security reasons, if a path doesn't lie inside
+        one of the template_dirs it is excluded from the result set.
+        """
+        for template_dir in self.get_dirs():
+            try:
+                name = safe_join(template_dir, template_name)
+            except SuspiciousFileOperation:
+                # The joined path was located outside of this template_dir
+                # (it might be inside another one, so this isn't fatal).
+                continue
+
+            yield Origin(
+                name=name,
+                template_name=template_name,
+                loader=self,
+            )

venv/lib/python3.7/site-packages/django/template/response.py

@@ -0,0 +1,145 @@
+from django.http import HttpResponse
+
+from .loader import get_template, select_template
+
+
+class ContentNotRenderedError(Exception):
+    pass
+
+
+class SimpleTemplateResponse(HttpResponse):
+    rendering_attrs = ['template_name', 'context_data', '_post_render_callbacks']
+
+    def __init__(self, template, context=None, content_type=None, status=None,
+                 charset=None, using=None):
+        # It would seem obvious to call these next two members 'template' and
+        # 'context', but those names are reserved as part of the test Client
+        # API. To avoid the name collision, we use different names.
+        self.template_name = template
+        self.context_data = context
+
+        self.using = using
+
+        self._post_render_callbacks = []
+
+        # _request stores the current request object in subclasses that know
+        # about requests, like TemplateResponse. It's defined in the base class
+        # to minimize code duplication.
+        # It's called self._request because self.request gets overwritten by
+        # django.test.client.Client. Unlike template_name and context_data,
+        # _request should not be considered part of the public API.
+        self._request = None
+
+        # content argument doesn't make sense here because it will be replaced
+        # with rendered template so we always pass empty string in order to
+        # prevent errors and provide shorter signature.
+        super().__init__('', content_type, status, charset=charset)
+
+        # _is_rendered tracks whether the template and context has been baked
+        # into a final response.
+        # Super __init__ doesn't know any better than to set self.content to
+        # the empty string we just gave it, which wrongly sets _is_rendered
+        # True, so we initialize it to False after the call to super __init__.
+        self._is_rendered = False
+
+    def __getstate__(self):
+        """
+        Raise an exception if trying to pickle an unrendered response. Pickle
+        only rendered data, not the data used to construct the response.
+        """
+        obj_dict = self.__dict__.copy()
+        if not self._is_rendered:
+            raise ContentNotRenderedError('The response content must be '
+                                          'rendered before it can be pickled.')
+        for attr in self.rendering_attrs:
+            if attr in obj_dict:
+                del obj_dict[attr]
+
+        return obj_dict
+
+    def resolve_template(self, template):
+        """Accept a template object, path-to-template, or list of paths."""
+        if isinstance(template, (list, tuple)):
+            return select_template(template, using=self.using)
+        elif isinstance(template, str):
+            return get_template(template, using=self.using)
+        else:
+            return template
+
+    def resolve_context(self, context):
+        return context
+
+    @property
+    def rendered_content(self):
+        """Return the freshly rendered content for the template and context
+        described by the TemplateResponse.
+
+        This *does not* set the final content of the response. To set the
+        response content, you must either call render(), or set the
+        content explicitly using the value of this property.
+        """
+        template = self.resolve_template(self.template_name)
+        context = self.resolve_context(self.context_data)
+        content = template.render(context, self._request)
+        return content
+
+    def add_post_render_callback(self, callback):
+        """Add a new post-rendering callback.
+
+        If the response has already been rendered,
+        invoke the callback immediately.
+        """
+        if self._is_rendered:
+            callback(self)
+        else:
+            self._post_render_callbacks.append(callback)
+
+    def render(self):
+        """Render (thereby finalizing) the content of the response.
+
+        If the content has already been rendered, this is a no-op.
+
+        Return the baked response instance.
+        """
+        retval = self
+        if not self._is_rendered:
+            self.content = self.rendered_content
+            for post_callback in self._post_render_callbacks:
+                newretval = post_callback(retval)
+                if newretval is not None:
+                    retval = newretval
+        return retval
+
+    @property
+    def is_rendered(self):
+        return self._is_rendered
+
+    def __iter__(self):
+        if not self._is_rendered:
+            raise ContentNotRenderedError(
+                'The response content must be rendered before it can be iterated over.'
+            )
+        return super().__iter__()
+
+    @property
+    def content(self):
+        if not self._is_rendered:
+            raise ContentNotRenderedError(
+                'The response content must be rendered before it can be accessed.'
+            )
+        return super().content
+
+    @content.setter
+    def content(self, value):
+        """Set the content for the response."""
+        HttpResponse.content.fset(self, value)
+        self._is_rendered = True
+
+
+class TemplateResponse(SimpleTemplateResponse):
+    rendering_attrs = SimpleTemplateResponse.rendering_attrs + ['_request']
+
+    def __init__(self, request, template, context=None, content_type=None,
+                 status=None, charset=None, using=None):
+        super().__init__(template, context, content_type, status, charset, using)
+        self._request = request

venv/lib/python3.7/site-packages/django/template/smartif.py

@@ -0,0 +1,208 @@
+"""
+Parser and utilities for the smart 'if' tag
+"""
+# Using a simple top down parser, as described here:
+#    http://effbot.org/zone/simple-top-down-parsing.htm.
+# 'led' = left denotation
+# 'nud' = null denotation
+# 'bp' = binding power (left = lbp, right = rbp)
+
+
+class TokenBase:
+    """
+    Base class for operators and literals, mainly for debugging and for throwing
+    syntax errors.
+    """
+    id = None  # node/token type name
+    value = None  # used by literals
+    first = second = None  # used by tree nodes
+
+    def nud(self, parser):
+        # Null denotation - called in prefix context
+        raise parser.error_class(
+            "Not expecting '%s' in this position in if tag." % self.id
+        )
+
+    def led(self, left, parser):
+        # Left denotation - called in infix context
+        raise parser.error_class(
+            "Not expecting '%s' as infix operator in if tag." % self.id
+        )
+
+    def display(self):
+        """
+        Return what to display in error messages for this node
+        """
+        return self.id
+
+    def __repr__(self):
+        out = [str(x) for x in [self.id, self.first, self.second] if x is not None]
+        return "(" + " ".join(out) + ")"
+
+
+def infix(bp, func):
+    """
+    Create an infix operator, given a binding power and a function that
+    evaluates the node.
+    """
+    class Operator(TokenBase):
+        lbp = bp
+
+        def led(self, left, parser):
+            self.first = left
+            self.second = parser.expression(bp)
+            return self
+
+        def eval(self, context):
+            try:
+                return func(context, self.first, self.second)
+            except Exception:
+                # Templates shouldn't throw exceptions when rendering.  We are
+                # most likely to get exceptions for things like {% if foo in bar
+                # %} where 'bar' does not support 'in', so default to False
+                return False
+
+    return Operator
+
+
+def prefix(bp, func):
+    """
+    Create a prefix operator, given a binding power and a function that
+    evaluates the node.
+    """
+    class Operator(TokenBase):
+        lbp = bp
+
+        def nud(self, parser):
+            self.first = parser.expression(bp)
+            self.second = None
+            return self
+
+        def eval(self, context):
+            try:
+                return func(context, self.first)
+            except Exception:
+                return False
+
+    return Operator
+
+
+# Operator precedence follows Python.
+# We defer variable evaluation to the lambda to ensure that terms are
+# lazily evaluated using Python's boolean parsing logic.
+OPERATORS = {
+    'or': infix(6, lambda context, x, y: x.eval(context) or y.eval(context)),
+    'and': infix(7, lambda context, x, y: x.eval(context) and y.eval(context)),
+    'not': prefix(8, lambda context, x: not x.eval(context)),
+    'in': infix(9, lambda context, x, y: x.eval(context) in y.eval(context)),
+    'not in': infix(9, lambda context, x, y: x.eval(context) not in y.eval(context)),
+    'is': infix(10, lambda context, x, y: x.eval(context) is y.eval(context)),
+    'is not': infix(10, lambda context, x, y: x.eval(context) is not y.eval(context)),
+    '==': infix(10, lambda context, x, y: x.eval(context) == y.eval(context)),
+    '!=': infix(10, lambda context, x, y: x.eval(context) != y.eval(context)),
+    '>': infix(10, lambda context, x, y: x.eval(context) > y.eval(context)),
+    '>=': infix(10, lambda context, x, y: x.eval(context) >= y.eval(context)),
+    '<': infix(10, lambda context, x, y: x.eval(context) < y.eval(context)),
+    '<=': infix(10, lambda context, x, y: x.eval(context) <= y.eval(context)),
+}
+
+# Assign 'id' to each:
+for key, op in OPERATORS.items():
+    op.id = key
+
+
+class Literal(TokenBase):
+    """
+    A basic self-resolvable object similar to a Django template variable.
+    """
+    # IfParser uses Literal in create_var, but TemplateIfParser overrides
+    # create_var so that a proper implementation that actually resolves
+    # variables, filters etc. is used.
+    id = "literal"
+    lbp = 0
+
+    def __init__(self, value):
+        self.value = value
+
+    def display(self):
+        return repr(self.value)
+
+    def nud(self, parser):
+        return self
+
+    def eval(self, context):
+        return self.value
+
+    def __repr__(self):
+        return "(%s %r)" % (self.id, self.value)
+
+
+class EndToken(TokenBase):
+    lbp = 0
+
+    def nud(self, parser):
+        raise parser.error_class("Unexpected end of expression in if tag.")
+
+
+EndToken = EndToken()
+
+
+class IfParser:
+    error_class = ValueError
+
+    def __init__(self, tokens):
+        # Turn 'is','not' and 'not','in' into single tokens.
+        num_tokens = len(tokens)
+        mapped_tokens = []
+        i = 0
+        while i < num_tokens:
+            token = tokens[i]
+            if token == "is" and i + 1 < num_tokens and tokens[i + 1] == "not":
+                token = "is not"
+                i += 1  # skip 'not'
+            elif token == "not" and i + 1 < num_tokens and tokens[i + 1] == "in":
+                token = "not in"
+                i += 1  # skip 'in'
+            mapped_tokens.append(self.translate_token(token))
+            i += 1
+
+        self.tokens = mapped_tokens
+        self.pos = 0
+        self.current_token = self.next_token()
+
+    def translate_token(self, token):
+        try:
+            op = OPERATORS[token]
+        except (KeyError, TypeError):
+            return self.create_var(token)
+        else:
+            return op()
+
+    def next_token(self):
+        if self.pos >= len(self.tokens):
+            return EndToken
+        else:
+            retval = self.tokens[self.pos]
+            self.pos += 1
+            return retval
+
+    def parse(self):
+        retval = self.expression()
+        # Check that we have exhausted all the tokens
+        if self.current_token is not EndToken:
+            raise self.error_class("Unused '%s' at end of if expression." %
+                                   self.current_token.display())
+        return retval
+
+    def expression(self, rbp=0):
+        t = self.current_token
+        self.current_token = self.next_token()
+        left = t.nud(self)
+        while rbp < self.current_token.lbp:
+            t = self.current_token
+            self.current_token = self.next_token()
+            left = t.led(left, self)
+        return left
+
+    def create_var(self, value):
+        return Literal(value)