Revert "Import external/python/jinja into master"

This reverts commit e868444bb65b7ae2a025b1c8c7854a8c4f2f58c1.

Reason for revert: Since build will failed. We might need to wait b/160731429 fixed and submit it again.

Change-Id: I56449de779d11c13cdfe1243b9a9726f94e55b33

26 files changed, 0 insertions, 12583 deletions

diff --git a/src/jinja2/__init__.py b/src/jinja2/__init__.py
deleted file mode 100644
index 8fa05183..00000000
--- a/src/jinja2/__init__.py
+++ /dev/null
@@ -1,43 +0,0 @@
-"""Jinja is a template engine written in pure Python. It provides a
-non-XML syntax that supports inline expressions and an optional
-sandboxed environment.
-"""
-from markupsafe import escape
-from markupsafe import Markup
-
-from .bccache import BytecodeCache
-from .bccache import FileSystemBytecodeCache
-from .bccache import MemcachedBytecodeCache
-from .environment import Environment
-from .environment import Template
-from .exceptions import TemplateAssertionError
-from .exceptions import TemplateError
-from .exceptions import TemplateNotFound
-from .exceptions import TemplateRuntimeError
-from .exceptions import TemplatesNotFound
-from .exceptions import TemplateSyntaxError
-from .exceptions import UndefinedError
-from .filters import contextfilter
-from .filters import environmentfilter
-from .filters import evalcontextfilter
-from .loaders import BaseLoader
-from .loaders import ChoiceLoader
-from .loaders import DictLoader
-from .loaders import FileSystemLoader
-from .loaders import FunctionLoader
-from .loaders import ModuleLoader
-from .loaders import PackageLoader
-from .loaders import PrefixLoader
-from .runtime import ChainableUndefined
-from .runtime import DebugUndefined
-from .runtime import make_logging_undefined
-from .runtime import StrictUndefined
-from .runtime import Undefined
-from .utils import clear_caches
-from .utils import contextfunction
-from .utils import environmentfunction
-from .utils import evalcontextfunction
-from .utils import is_undefined
-from .utils import select_autoescape
-
-__version__ = "3.0.0a1"
diff --git a/src/jinja2/_identifier.py b/src/jinja2/_identifier.py
deleted file mode 100644
index 224d5449..00000000
--- a/src/jinja2/_identifier.py
+++ /dev/null
@@ -1,6 +0,0 @@
-import re
-
-# generated by scripts/generate_identifier_pattern.py
-pattern = re.compile(
-    r"[\w·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-ٰٟۖ-ۜ۟-۪ۤۧۨ-ܑۭܰ-݊ަ-ް߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣔ-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣঁ-ঃ়া-ৄেৈো-্ৗৢৣਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑੰੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣஂா-ூெ-ைொ-்ௗఀ-ఃా-ౄె-ైొ-్ౕౖౢౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣංඃ්ා-ුූෘ-ෟෲෳัิ-ฺ็-๎ັິ-ູົຼ່-ໍ༹༘༙༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝᠋-᠍ᢅᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-᪽ᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰℘℮⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣠-꣱ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌꩍꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭ﬞ︀-️︠-︯︳︴﹍-﹏＿𐇽𐋠𐍶-𐍺𐨁-𐨃𐨅𐨆𐨌-𐨏𐨸-𐨿𐨺𐫦𐫥𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑅳𑄴𑆀-𑆂𑆳-𑇊𑇀-𑇌𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌼𑌾-𑍄𑍇𑍈𑍋-𑍍𑍗𑍢𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𖫰-𖫴𖬰-𖬶𖽑-𖽾𖾏-𖾒𛲝𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣𞀤𞀦-𞣐𞀪-𞣖𞥄-𞥊󠄀-󠇯]+"  # noqa: B950
-)
diff --git a/src/jinja2/asyncfilters.py b/src/jinja2/asyncfilters.py
deleted file mode 100644
index 0aad12c8..00000000
--- a/src/jinja2/asyncfilters.py
+++ /dev/null
@@ -1,157 +0,0 @@
-from functools import wraps
-
-from . import filters
-from .asyncsupport import auto_aiter
-from .asyncsupport import auto_await
-
-
-async def auto_to_seq(value):
-    seq = []
-    if hasattr(value, "__aiter__"):
-        async for item in value:
-            seq.append(item)
-    else:
-        for item in value:
-            seq.append(item)
-    return seq
-
-
-async def async_select_or_reject(args, kwargs, modfunc, lookup_attr):
-    seq, func = filters.prepare_select_or_reject(args, kwargs, modfunc, lookup_attr)
-    if seq:
-        async for item in auto_aiter(seq):
-            if func(item):
-                yield item
-
-
-def dualfilter(normal_filter, async_filter):
-    wrap_evalctx = False
-    if getattr(normal_filter, "environmentfilter", False) is True:
-
-        def is_async(args):
-            return args[0].is_async
-
-        wrap_evalctx = False
-    else:
-        has_evalctxfilter = getattr(normal_filter, "evalcontextfilter", False) is True
-        has_ctxfilter = getattr(normal_filter, "contextfilter", False) is True
-        wrap_evalctx = not has_evalctxfilter and not has_ctxfilter
-
-        def is_async(args):
-            return args[0].environment.is_async
-
-    @wraps(normal_filter)
-    def wrapper(*args, **kwargs):
-        b = is_async(args)
-        if wrap_evalctx:
-            args = args[1:]
-        if b:
-            return async_filter(*args, **kwargs)
-        return normal_filter(*args, **kwargs)
-
-    if wrap_evalctx:
-        wrapper.evalcontextfilter = True
-
-    wrapper.asyncfiltervariant = True
-
-    return wrapper
-
-
-def asyncfiltervariant(original):
-    def decorator(f):
-        return dualfilter(original, f)
-
-    return decorator
-
-
-@asyncfiltervariant(filters.do_first)
-async def do_first(environment, seq):
-    try:
-        return await auto_aiter(seq).__anext__()
-    except StopAsyncIteration:
-        return environment.undefined("No first item, sequence was empty.")
-
-
-@asyncfiltervariant(filters.do_groupby)
-async def do_groupby(environment, value, attribute):
-    expr = filters.make_attrgetter(environment, attribute)
-    return [
-        filters._GroupTuple(key, await auto_to_seq(values))
-        for key, values in filters.groupby(
-            sorted(await auto_to_seq(value), key=expr), expr
-        )
-    ]
-
-
-@asyncfiltervariant(filters.do_join)
-async def do_join(eval_ctx, value, d="", attribute=None):
-    return filters.do_join(eval_ctx, await auto_to_seq(value), d, attribute)
-
-
-@asyncfiltervariant(filters.do_list)
-async def do_list(value):
-    return await auto_to_seq(value)
-
-
-@asyncfiltervariant(filters.do_reject)
-async def do_reject(*args, **kwargs):
-    return async_select_or_reject(args, kwargs, lambda x: not x, False)
-
-
-@asyncfiltervariant(filters.do_rejectattr)
-async def do_rejectattr(*args, **kwargs):
-    return async_select_or_reject(args, kwargs, lambda x: not x, True)
-
-
-@asyncfiltervariant(filters.do_select)
-async def do_select(*args, **kwargs):
-    return async_select_or_reject(args, kwargs, lambda x: x, False)
-
-
-@asyncfiltervariant(filters.do_selectattr)
-async def do_selectattr(*args, **kwargs):
-    return async_select_or_reject(args, kwargs, lambda x: x, True)
-
-
-@asyncfiltervariant(filters.do_map)
-async def do_map(*args, **kwargs):
-    seq, func = filters.prepare_map(args, kwargs)
-    if seq:
-        async for item in auto_aiter(seq):
-            yield await auto_await(func(item))
-
-
-@asyncfiltervariant(filters.do_sum)
-async def do_sum(environment, iterable, attribute=None, start=0):
-    rv = start
-    if attribute is not None:
-        func = filters.make_attrgetter(environment, attribute)
-    else:
-
-        def func(x):
-            return x
-
-    async for item in auto_aiter(iterable):
-        rv += func(item)
-    return rv
-
-
-@asyncfiltervariant(filters.do_slice)
-async def do_slice(value, slices, fill_with=None):
-    return filters.do_slice(await auto_to_seq(value), slices, fill_with)
-
-
-ASYNC_FILTERS = {
-    "first": do_first,
-    "groupby": do_groupby,
-    "join": do_join,
-    "list": do_list,
-    # we intentionally do not support do_last because it may not be safe in async
-    "reject": do_reject,
-    "rejectattr": do_rejectattr,
-    "map": do_map,
-    "select": do_select,
-    "selectattr": do_selectattr,
-    "sum": do_sum,
-    "slice": do_slice,
-}
diff --git a/src/jinja2/asyncsupport.py b/src/jinja2/asyncsupport.py
deleted file mode 100644
index e46a85a3..00000000
--- a/src/jinja2/asyncsupport.py
+++ /dev/null
@@ -1,249 +0,0 @@
-"""The code for async support. Importing this patches Jinja."""
-import asyncio
-import inspect
-from functools import update_wrapper
-
-from markupsafe import Markup
-
-from .environment import TemplateModule
-from .runtime import LoopContext
-from .utils import concat
-from .utils import internalcode
-from .utils import missing
-
-
-async def concat_async(async_gen):
-    rv = []
-
-    async def collect():
-        async for event in async_gen:
-            rv.append(event)
-
-    await collect()
-    return concat(rv)
-
-
-async def generate_async(self, *args, **kwargs):
-    vars = dict(*args, **kwargs)
-    try:
-        async for event in self.root_render_func(self.new_context(vars)):
-            yield event
-    except Exception:
-        yield self.environment.handle_exception()
-
-
-def wrap_generate_func(original_generate):
-    def _convert_generator(self, loop, args, kwargs):
-        async_gen = self.generate_async(*args, **kwargs)
-        try:
-            while 1:
-                yield loop.run_until_complete(async_gen.__anext__())
-        except StopAsyncIteration:
-            pass
-
-    def generate(self, *args, **kwargs):
-        if not self.environment.is_async:
-            return original_generate(self, *args, **kwargs)
-        return _convert_generator(self, asyncio.get_event_loop(), args, kwargs)
-
-    return update_wrapper(generate, original_generate)
-
-
-async def render_async(self, *args, **kwargs):
-    if not self.environment.is_async:
-        raise RuntimeError("The environment was not created with async mode enabled.")
-
-    vars = dict(*args, **kwargs)
-    ctx = self.new_context(vars)
-
-    try:
-        return await concat_async(self.root_render_func(ctx))
-    except Exception:
-        return self.environment.handle_exception()
-
-
-def wrap_render_func(original_render):
-    def render(self, *args, **kwargs):
-        if not self.environment.is_async:
-            return original_render(self, *args, **kwargs)
-        loop = asyncio.get_event_loop()
-        return loop.run_until_complete(self.render_async(*args, **kwargs))
-
-    return update_wrapper(render, original_render)
-
-
-def wrap_block_reference_call(original_call):
-    @internalcode
-    async def async_call(self):
-        rv = await concat_async(self._stack[self._depth](self._context))
-        if self._context.eval_ctx.autoescape:
-            rv = Markup(rv)
-        return rv
-
-    @internalcode
-    def __call__(self):
-        if not self._context.environment.is_async:
-            return original_call(self)
-        return async_call(self)
-
-    return update_wrapper(__call__, original_call)
-
-
-def wrap_macro_invoke(original_invoke):
-    @internalcode
-    async def async_invoke(self, arguments, autoescape):
-        rv = await self._func(*arguments)
-        if autoescape:
-            rv = Markup(rv)
-        return rv
-
-    @internalcode
-    def _invoke(self, arguments, autoescape):
-        if not self._environment.is_async:
-            return original_invoke(self, arguments, autoescape)
-        return async_invoke(self, arguments, autoescape)
-
-    return update_wrapper(_invoke, original_invoke)
-
-
-@internalcode
-async def get_default_module_async(self):
-    if self._module is not None:
-        return self._module
-    self._module = rv = await self.make_module_async()
-    return rv
-
-
-def wrap_default_module(original_default_module):
-    @internalcode
-    def _get_default_module(self, ctx=None):
-        if self.environment.is_async:
-            raise RuntimeError("Template module attribute is unavailable in async mode")
-        return original_default_module(self, ctx)
-
-    return _get_default_module
-
-
-async def make_module_async(self, vars=None, shared=False, locals=None):
-    context = self.new_context(vars, shared, locals)
-    body_stream = []
-    async for item in self.root_render_func(context):
-        body_stream.append(item)
-    return TemplateModule(self, context, body_stream)
-
-
-def patch_template():
-    from . import Template
-
-    Template.generate = wrap_generate_func(Template.generate)
-    Template.generate_async = update_wrapper(generate_async, Template.generate_async)
-    Template.render_async = update_wrapper(render_async, Template.render_async)
-    Template.render = wrap_render_func(Template.render)
-    Template._get_default_module = wrap_default_module(Template._get_default_module)
-    Template._get_default_module_async = get_default_module_async
-    Template.make_module_async = update_wrapper(
-        make_module_async, Template.make_module_async
-    )
-
-
-def patch_runtime():
-    from .runtime import BlockReference, Macro
-
-    BlockReference.__call__ = wrap_block_reference_call(BlockReference.__call__)
-    Macro._invoke = wrap_macro_invoke(Macro._invoke)
-
-
-def patch_filters():
-    from .filters import FILTERS
-    from .asyncfilters import ASYNC_FILTERS
-
-    FILTERS.update(ASYNC_FILTERS)
-
-
-def patch_all():
-    patch_template()
-    patch_runtime()
-    patch_filters()
-
-
-async def auto_await(value):
-    if inspect.isawaitable(value):
-        return await value
-    return value
-
-
-async def auto_aiter(iterable):
-    if hasattr(iterable, "__aiter__"):
-        async for item in iterable:
-            yield item
-        return
-    for item in iterable:
-        yield item
-
-
-class AsyncLoopContext(LoopContext):
-    _to_iterator = staticmethod(auto_aiter)
-
-    @property
-    async def length(self):
-        if self._length is not None:
-            return self._length
-
-        try:
-            self._length = len(self._iterable)
-        except TypeError:
-            iterable = [x async for x in self._iterator]
-            self._iterator = self._to_iterator(iterable)
-            self._length = len(iterable) + self.index + (self._after is not missing)
-
-        return self._length
-
-    @property
-    async def revindex0(self):
-        return await self.length - self.index
-
-    @property
-    async def revindex(self):
-        return await self.length - self.index0
-
-    async def _peek_next(self):
-        if self._after is not missing:
-            return self._after
-
-        try:
-            self._after = await self._iterator.__anext__()
-        except StopAsyncIteration:
-            self._after = missing
-
-        return self._after
-
-    @property
-    async def last(self):
-        return await self._peek_next() is missing
-
-    @property
-    async def nextitem(self):
-        rv = await self._peek_next()
-
-        if rv is missing:
-            return self._undefined("there is no next item")
-
-        return rv
-
-    def __aiter__(self):
-        return self
-
-    async def __anext__(self):
-        if self._after is not missing:
-            rv = self._after
-            self._after = missing
-        else:
-            rv = await self._iterator.__anext__()
-
-        self.index0 += 1
-        self._before = self._current
-        self._current = rv
-        return rv, self
-
-
-patch_all()
diff --git a/src/jinja2/bccache.py b/src/jinja2/bccache.py
deleted file mode 100644
index 7ddcf405..00000000
--- a/src/jinja2/bccache.py
+++ /dev/null
@@ -1,345 +0,0 @@
-"""The optional bytecode cache system. This is useful if you have very
-complex template situations and the compilation of all those templates
-slows down your application too much.
-
-Situations where this is useful are often forking web applications that
-are initialized on the first request.
-"""
-import errno
-import fnmatch
-import marshal
-import os
-import pickle
-import stat
-import sys
-import tempfile
-from hashlib import sha1
-from io import BytesIO
-
-from .utils import open_if_exists
-
-bc_version = 5
-# Magic bytes to identify Jinja bytecode cache files. Contains the
-# Python major and minor version to avoid loading incompatible bytecode
-# if a project upgrades its Python version.
-bc_magic = (
-    b"j2"
-    + pickle.dumps(bc_version, 2)
-    + pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1], 2)
-)
-
-
-class Bucket:
-    """Buckets are used to store the bytecode for one template.  It's created
-    and initialized by the bytecode cache and passed to the loading functions.
-
-    The buckets get an internal checksum from the cache assigned and use this
-    to automatically reject outdated cache material.  Individual bytecode
-    cache subclasses don't have to care about cache invalidation.
-    """
-
-    def __init__(self, environment, key, checksum):
-        self.environment = environment
-        self.key = key
-        self.checksum = checksum
-        self.reset()
-
-    def reset(self):
-        """Resets the bucket (unloads the bytecode)."""
-        self.code = None
-
-    def load_bytecode(self, f):
-        """Loads bytecode from a file or file like object."""
-        # make sure the magic header is correct
-        magic = f.read(len(bc_magic))
-        if magic != bc_magic:
-            self.reset()
-            return
-        # the source code of the file changed, we need to reload
-        checksum = pickle.load(f)
-        if self.checksum != checksum:
-            self.reset()
-            return
-        # if marshal_load fails then we need to reload
-        try:
-            self.code = marshal.load(f)
-        except (EOFError, ValueError, TypeError):
-            self.reset()
-            return
-
-    def write_bytecode(self, f):
-        """Dump the bytecode into the file or file like object passed."""
-        if self.code is None:
-            raise TypeError("can't write empty bucket")
-        f.write(bc_magic)
-        pickle.dump(self.checksum, f, 2)
-        marshal.dump(self.code, f)
-
-    def bytecode_from_string(self, string):
-        """Load bytecode from a string."""
-        self.load_bytecode(BytesIO(string))
-
-    def bytecode_to_string(self):
-        """Return the bytecode as string."""
-        out = BytesIO()
-        self.write_bytecode(out)
-        return out.getvalue()
-
-
-class BytecodeCache:
-    """To implement your own bytecode cache you have to subclass this class
-    and override :meth:`load_bytecode` and :meth:`dump_bytecode`.  Both of
-    these methods are passed a :class:`~jinja2.bccache.Bucket`.
-
-    A very basic bytecode cache that saves the bytecode on the file system::
-
-        from os import path
-
-        class MyCache(BytecodeCache):
-
-            def __init__(self, directory):
-                self.directory = directory
-
-            def load_bytecode(self, bucket):
-                filename = path.join(self.directory, bucket.key)
-                if path.exists(filename):
-                    with open(filename, 'rb') as f:
-                        bucket.load_bytecode(f)
-
-            def dump_bytecode(self, bucket):
-                filename = path.join(self.directory, bucket.key)
-                with open(filename, 'wb') as f:
-                    bucket.write_bytecode(f)
-
-    A more advanced version of a filesystem based bytecode cache is part of
-    Jinja.
-    """
-
-    def load_bytecode(self, bucket):
-        """Subclasses have to override this method to load bytecode into a
-        bucket.  If they are not able to find code in the cache for the
-        bucket, it must not do anything.
-        """
-        raise NotImplementedError()
-
-    def dump_bytecode(self, bucket):
-        """Subclasses have to override this method to write the bytecode
-        from a bucket back to the cache.  If it unable to do so it must not
-        fail silently but raise an exception.
-        """
-        raise NotImplementedError()
-
-    def clear(self):
-        """Clears the cache.  This method is not used by Jinja but should be
-        implemented to allow applications to clear the bytecode cache used
-        by a particular environment.
-        """
-
-    def get_cache_key(self, name, filename=None):
-        """Returns the unique hash key for this template name."""
-        hash = sha1(name.encode("utf-8"))
-        if filename is not None:
-            filename = "|" + filename
-            if isinstance(filename, str):
-                filename = filename.encode("utf-8")
-            hash.update(filename)
-        return hash.hexdigest()
-
-    def get_source_checksum(self, source):
-        """Returns a checksum for the source."""
-        return sha1(source.encode("utf-8")).hexdigest()
-
-    def get_bucket(self, environment, name, filename, source):
-        """Return a cache bucket for the given template.  All arguments are
-        mandatory but filename may be `None`.
-        """
-        key = self.get_cache_key(name, filename)
-        checksum = self.get_source_checksum(source)
-        bucket = Bucket(environment, key, checksum)
-        self.load_bytecode(bucket)
-        return bucket
-
-    def set_bucket(self, bucket):
-        """Put the bucket into the cache."""
-        self.dump_bytecode(bucket)
-
-
-class FileSystemBytecodeCache(BytecodeCache):
-    """A bytecode cache that stores bytecode on the filesystem.  It accepts
-    two arguments: The directory where the cache items are stored and a
-    pattern string that is used to build the filename.
-
-    If no directory is specified a default cache directory is selected.  On
-    Windows the user's temp directory is used, on UNIX systems a directory
-    is created for the user in the system temp directory.
-
-    The pattern can be used to have multiple separate caches operate on the
-    same directory.  The default pattern is ``'__jinja2_%s.cache'``.  ``%s``
-    is replaced with the cache key.
-
-    >>> bcc = FileSystemBytecodeCache('/tmp/jinja_cache', '%s.cache')
-
-    This bytecode cache supports clearing of the cache using the clear method.
-    """
-
-    def __init__(self, directory=None, pattern="__jinja2_%s.cache"):
-        if directory is None:
-            directory = self._get_default_cache_dir()
-        self.directory = directory
-        self.pattern = pattern
-
-    def _get_default_cache_dir(self):
-        def _unsafe_dir():
-            raise RuntimeError(
-                "Cannot determine safe temp directory.  You "
-                "need to explicitly provide one."
-            )
-
-        tmpdir = tempfile.gettempdir()
-
-        # On windows the temporary directory is used specific unless
-        # explicitly forced otherwise.  We can just use that.
-        if os.name == "nt":
-            return tmpdir
-        if not hasattr(os, "getuid"):
-            _unsafe_dir()
-
-        dirname = f"_jinja2-cache-{os.getuid()}"
-        actual_dir = os.path.join(tmpdir, dirname)
-
-        try:
-            os.mkdir(actual_dir, stat.S_IRWXU)
-        except OSError as e:
-            if e.errno != errno.EEXIST:
-                raise
-        try:
-            os.chmod(actual_dir, stat.S_IRWXU)
-            actual_dir_stat = os.lstat(actual_dir)
-            if (
-                actual_dir_stat.st_uid != os.getuid()
-                or not stat.S_ISDIR(actual_dir_stat.st_mode)
-                or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
-            ):
-                _unsafe_dir()
-        except OSError as e:
-            if e.errno != errno.EEXIST:
-                raise
-
-        actual_dir_stat = os.lstat(actual_dir)
-        if (
-            actual_dir_stat.st_uid != os.getuid()
-            or not stat.S_ISDIR(actual_dir_stat.st_mode)
-            or stat.S_IMODE(actual_dir_stat.st_mode) != stat.S_IRWXU
-        ):
-            _unsafe_dir()
-
-        return actual_dir
-
-    def _get_cache_filename(self, bucket):
-        return os.path.join(self.directory, self.pattern % (bucket.key,))
-
-    def load_bytecode(self, bucket):
-        f = open_if_exists(self._get_cache_filename(bucket), "rb")
-        if f is not None:
-            try:
-                bucket.load_bytecode(f)
-            finally:
-                f.close()
-
-    def dump_bytecode(self, bucket):
-        f = open(self._get_cache_filename(bucket), "wb")
-        try:
-            bucket.write_bytecode(f)
-        finally:
-            f.close()
-
-    def clear(self):
-        # imported lazily here because google app-engine doesn't support
-        # write access on the file system and the function does not exist
-        # normally.
-        from os import remove
-
-        files = fnmatch.filter(os.listdir(self.directory), self.pattern % ("*",))
-        for filename in files:
-            try:
-                remove(os.path.join(self.directory, filename))
-            except OSError:
-                pass
-
-
-class MemcachedBytecodeCache(BytecodeCache):
-    """This class implements a bytecode cache that uses a memcache cache for
-    storing the information.  It does not enforce a specific memcache library
-    (tummy's memcache or cmemcache) but will accept any class that provides
-    the minimal interface required.
-
-    Libraries compatible with this class:
-
-    -   `cachelib <https://github.com/pallets/cachelib>`_
-    -   `python-memcached <https://pypi.org/project/python-memcached/>`_
-
-    (Unfortunately the django cache interface is not compatible because it
-    does not support storing binary data, only text. You can however pass
-    the underlying cache client to the bytecode cache which is available
-    as `django.core.cache.cache._client`.)
-
-    The minimal interface for the client passed to the constructor is this:
-
-    .. class:: MinimalClientInterface
-
-        .. method:: set(key, value[, timeout])
-
-            Stores the bytecode in the cache.  `value` is a string and
-            `timeout` the timeout of the key.  If timeout is not provided
-            a default timeout or no timeout should be assumed, if it's
-            provided it's an integer with the number of seconds the cache
-            item should exist.
-
-        .. method:: get(key)
-
-            Returns the value for the cache key.  If the item does not
-            exist in the cache the return value must be `None`.
-
-    The other arguments to the constructor are the prefix for all keys that
-    is added before the actual cache key and the timeout for the bytecode in
-    the cache system.  We recommend a high (or no) timeout.
-
-    This bytecode cache does not support clearing of used items in the cache.
-    The clear method is a no-operation function.
-
-    .. versionadded:: 2.7
-       Added support for ignoring memcache errors through the
-       `ignore_memcache_errors` parameter.
-    """
-
-    def __init__(
-        self,
-        client,
-        prefix="jinja2/bytecode/",
-        timeout=None,
-        ignore_memcache_errors=True,
-    ):
-        self.client = client
-        self.prefix = prefix
-        self.timeout = timeout
-        self.ignore_memcache_errors = ignore_memcache_errors
-
-    def load_bytecode(self, bucket):
-        try:
-            code = self.client.get(self.prefix + bucket.key)
-        except Exception:
-            if not self.ignore_memcache_errors:
-                raise
-            code = None
-        if code is not None:
-            bucket.bytecode_from_string(code)
-
-    def dump_bytecode(self, bucket):
-        args = (self.prefix + bucket.key, bucket.bytecode_to_string())
-        if self.timeout is not None:
-            args += (self.timeout,)
-        try:
-            self.client.set(*args)
-        except Exception:
-            if not self.ignore_memcache_errors:
-                raise
diff --git a/src/jinja2/compiler.py b/src/jinja2/compiler.py
deleted file mode 100644
index abdbe6da..00000000
--- a/src/jinja2/compiler.py
+++ /dev/null
@@ -1,1754 +0,0 @@
-"""Compiles nodes from the parser into Python code."""
-from collections import namedtuple
-from functools import update_wrapper
-from io import StringIO
-from itertools import chain
-from keyword import iskeyword as is_python_keyword
-
-from markupsafe import escape
-from markupsafe import Markup
-
-from . import nodes
-from .exceptions import TemplateAssertionError
-from .idtracking import Symbols
-from .idtracking import VAR_LOAD_ALIAS
-from .idtracking import VAR_LOAD_PARAMETER
-from .idtracking import VAR_LOAD_RESOLVE
-from .idtracking import VAR_LOAD_UNDEFINED
-from .nodes import EvalContext
-from .optimizer import Optimizer
-from .utils import concat
-from .visitor import NodeVisitor
-
-operators = {
-    "eq": "==",
-    "ne": "!=",
-    "gt": ">",
-    "gteq": ">=",
-    "lt": "<",
-    "lteq": "<=",
-    "in": "in",
-    "notin": "not in",
-}
-
-
-def optimizeconst(f):
-    def new_func(self, node, frame, **kwargs):
-        # Only optimize if the frame is not volatile
-        if self.optimized and not frame.eval_ctx.volatile:
-            new_node = self.optimizer.visit(node, frame.eval_ctx)
-            if new_node != node:
-                return self.visit(new_node, frame)
-        return f(self, node, frame, **kwargs)
-
-    return update_wrapper(new_func, f)
-
-
-def generate(
-    node, environment, name, filename, stream=None, defer_init=False, optimized=True
-):
-    """Generate the python source for a node tree."""
-    if not isinstance(node, nodes.Template):
-        raise TypeError("Can't compile non template nodes")
-    generator = environment.code_generator_class(
-        environment, name, filename, stream, defer_init, optimized
-    )
-    generator.visit(node)
-    if stream is None:
-        return generator.stream.getvalue()
-
-
-def has_safe_repr(value):
-    """Does the node have a safe representation?"""
-    if value is None or value is NotImplemented or value is Ellipsis:
-        return True
-
-    if type(value) in {bool, int, float, complex, range, str, Markup}:
-        return True
-
-    if type(value) in {tuple, list, set, frozenset}:
-        return all(has_safe_repr(v) for v in value)
-
-    if type(value) is dict:
-        return all(has_safe_repr(k) and has_safe_repr(v) for k, v in value.items())
-
-    return False
-
-
-def find_undeclared(nodes, names):
-    """Check if the names passed are accessed undeclared.  The return value
-    is a set of all the undeclared names from the sequence of names found.
-    """
-    visitor = UndeclaredNameVisitor(names)
-    try:
-        for node in nodes:
-            visitor.visit(node)
-    except VisitorExit:
-        pass
-    return visitor.undeclared
-
-
-class MacroRef:
-    def __init__(self, node):
-        self.node = node
-        self.accesses_caller = False
-        self.accesses_kwargs = False
-        self.accesses_varargs = False
-
-
-class Frame:
-    """Holds compile time information for us."""
-
-    def __init__(self, eval_ctx, parent=None, level=None):
-        self.eval_ctx = eval_ctx
-        self.symbols = Symbols(parent.symbols if parent else None, level=level)
-
-        # a toplevel frame is the root + soft frames such as if conditions.
-        self.toplevel = False
-
-        # the root frame is basically just the outermost frame, so no if
-        # conditions.  This information is used to optimize inheritance
-        # situations.
-        self.rootlevel = False
-
-        # in some dynamic inheritance situations the compiler needs to add
-        # write tests around output statements.
-        self.require_output_check = parent and parent.require_output_check
-
-        # inside some tags we are using a buffer rather than yield statements.
-        # this for example affects {% filter %} or {% macro %}.  If a frame
-        # is buffered this variable points to the name of the list used as
-        # buffer.
-        self.buffer = None
-
-        # the name of the block we're in, otherwise None.
-        self.block = parent.block if parent else None
-
-        # the parent of this frame
-        self.parent = parent
-
-        if parent is not None:
-            self.buffer = parent.buffer
-
-    def copy(self):
-        """Create a copy of the current one."""
-        rv = object.__new__(self.__class__)
-        rv.__dict__.update(self.__dict__)
-        rv.symbols = self.symbols.copy()
-        return rv
-
-    def inner(self, isolated=False):
-        """Return an inner frame."""
-        if isolated:
-            return Frame(self.eval_ctx, level=self.symbols.level + 1)
-        return Frame(self.eval_ctx, self)
-
-    def soft(self):
-        """Return a soft frame.  A soft frame may not be modified as
-        standalone thing as it shares the resources with the frame it
-        was created of, but it's not a rootlevel frame any longer.
-
-        This is only used to implement if-statements.
-        """
-        rv = self.copy()
-        rv.rootlevel = False
-        return rv
-
-    __copy__ = copy
-
-
-class VisitorExit(RuntimeError):
-    """Exception used by the `UndeclaredNameVisitor` to signal a stop."""
-
-
-class DependencyFinderVisitor(NodeVisitor):
-    """A visitor that collects filter and test calls."""
-
-    def __init__(self):
-        self.filters = set()
-        self.tests = set()
-
-    def visit_Filter(self, node):
-        self.generic_visit(node)
-        self.filters.add(node.name)
-
-    def visit_Test(self, node):
-        self.generic_visit(node)
-        self.tests.add(node.name)
-
-    def visit_Block(self, node):
-        """Stop visiting at blocks."""
-
-
-class UndeclaredNameVisitor(NodeVisitor):
-    """A visitor that checks if a name is accessed without being
-    declared.  This is different from the frame visitor as it will
-    not stop at closure frames.
-    """
-
-    def __init__(self, names):
-        self.names = set(names)
-        self.undeclared = set()
-
-    def visit_Name(self, node):
-        if node.ctx == "load" and node.name in self.names:
-            self.undeclared.add(node.name)
-            if self.undeclared == self.names:
-                raise VisitorExit()
-        else:
-            self.names.discard(node.name)
-
-    def visit_Block(self, node):
-        """Stop visiting a blocks."""
-
-
-class CompilerExit(Exception):
-    """Raised if the compiler encountered a situation where it just
-    doesn't make sense to further process the code.  Any block that
-    raises such an exception is not further processed.
-    """
-
-
-class CodeGenerator(NodeVisitor):
-    def __init__(
-        self, environment, name, filename, stream=None, defer_init=False, optimized=True
-    ):
-        if stream is None:
-            stream = StringIO()
-        self.environment = environment
-        self.name = name
-        self.filename = filename
-        self.stream = stream
-        self.created_block_context = False
-        self.defer_init = defer_init
-        self.optimized = optimized
-        if optimized:
-            self.optimizer = Optimizer(environment)
-
-        # aliases for imports
-        self.import_aliases = {}
-
-        # a registry for all blocks.  Because blocks are moved out
-        # into the global python scope they are registered here
-        self.blocks = {}
-
-        # the number of extends statements so far
-        self.extends_so_far = 0
-
-        # some templates have a rootlevel extends.  In this case we
-        # can safely assume that we're a child template and do some
-        # more optimizations.
-        self.has_known_extends = False
-
-        # the current line number
-        self.code_lineno = 1
-
-        # registry of all filters and tests (global, not block local)
-        self.tests = {}
-        self.filters = {}
-
-        # the debug information
-        self.debug_info = []
-        self._write_debug_info = None
-
-        # the number of new lines before the next write()
-        self._new_lines = 0
-
-        # the line number of the last written statement
-        self._last_line = 0
-
-        # true if nothing was written so far.
-        self._first_write = True
-
-        # used by the `temporary_identifier` method to get new
-        # unique, temporary identifier
-        self._last_identifier = 0
-
-        # the current indentation
-        self._indentation = 0
-
-        # Tracks toplevel assignments
-        self._assign_stack = []
-
-        # Tracks parameter definition blocks
-        self._param_def_block = []
-
-        # Tracks the current context.
-        self._context_reference_stack = ["context"]
-
-    # -- Various compilation helpers
-
-    def fail(self, msg, lineno):
-        """Fail with a :exc:`TemplateAssertionError`."""
-        raise TemplateAssertionError(msg, lineno, self.name, self.filename)
-
-    def temporary_identifier(self):
-        """Get a new unique identifier."""
-        self._last_identifier += 1
-        return f"t_{self._last_identifier}"
-
-    def buffer(self, frame):
-        """Enable buffering for the frame from that point onwards."""
-        frame.buffer = self.temporary_identifier()
-        self.writeline(f"{frame.buffer} = []")
-
-    def return_buffer_contents(self, frame, force_unescaped=False):
-        """Return the buffer contents of the frame."""
-        if not force_unescaped:
-            if frame.eval_ctx.volatile:
-                self.writeline("if context.eval_ctx.autoescape:")
-                self.indent()
-                self.writeline(f"return Markup(concat({frame.buffer}))")
-                self.outdent()
-                self.writeline("else:")
-                self.indent()
-                self.writeline(f"return concat({frame.buffer})")
-                self.outdent()
-                return
-            elif frame.eval_ctx.autoescape:
-                self.writeline(f"return Markup(concat({frame.buffer}))")
-                return
-        self.writeline(f"return concat({frame.buffer})")
-
-    def indent(self):
-        """Indent by one."""
-        self._indentation += 1
-
-    def outdent(self, step=1):
-        """Outdent by step."""
-        self._indentation -= step
-
-    def start_write(self, frame, node=None):
-        """Yield or write into the frame buffer."""
-        if frame.buffer is None:
-            self.writeline("yield ", node)
-        else:
-            self.writeline(f"{frame.buffer}.append(", node)
-
-    def end_write(self, frame):
-        """End the writing process started by `start_write`."""
-        if frame.buffer is not None:
-            self.write(")")
-
-    def simple_write(self, s, frame, node=None):
-        """Simple shortcut for start_write + write + end_write."""
-        self.start_write(frame, node)
-        self.write(s)
-        self.end_write(frame)
-
-    def blockvisit(self, nodes, frame):
-        """Visit a list of nodes as block in a frame.  If the current frame
-        is no buffer a dummy ``if 0: yield None`` is written automatically.
-        """
-        try:
-            self.writeline("pass")
-            for node in nodes:
-                self.visit(node, frame)
-        except CompilerExit:
-            pass
-
-    def write(self, x):
-        """Write a string into the output stream."""
-        if self._new_lines:
-            if not self._first_write:
-                self.stream.write("\n" * self._new_lines)
-                self.code_lineno += self._new_lines
-                if self._write_debug_info is not None:
-                    self.debug_info.append((self._write_debug_info, self.code_lineno))
-                    self._write_debug_info = None
-            self._first_write = False
-            self.stream.write("    " * self._indentation)
-            self._new_lines = 0
-        self.stream.write(x)
-
-    def writeline(self, x, node=None, extra=0):
-        """Combination of newline and write."""
-        self.newline(node, extra)
-        self.write(x)
-
-    def newline(self, node=None, extra=0):
-        """Add one or more newlines before the next write."""
-        self._new_lines = max(self._new_lines, 1 + extra)
-        if node is not None and node.lineno != self._last_line:
-            self._write_debug_info = node.lineno
-            self._last_line = node.lineno
-
-    def signature(self, node, frame, extra_kwargs=None):
-        """Writes a function call to the stream for the current node.
-        A leading comma is added automatically.  The extra keyword
-        arguments may not include python keywords otherwise a syntax
-        error could occur.  The extra keyword arguments should be given
-        as python dict.
-        """
-        # if any of the given keyword arguments is a python keyword
-        # we have to make sure that no invalid call is created.
-        kwarg_workaround = False
-        for kwarg in chain((x.key for x in node.kwargs), extra_kwargs or ()):
-            if is_python_keyword(kwarg):
-                kwarg_workaround = True
-                break
-
-        for arg in node.args:
-            self.write(", ")
-            self.visit(arg, frame)
-
-        if not kwarg_workaround:
-            for kwarg in node.kwargs:
-                self.write(", ")
-                self.visit(kwarg, frame)
-            if extra_kwargs is not None:
-                for key, value in extra_kwargs.items():
-                    self.write(f", {key}={value}")
-        if node.dyn_args:
-            self.write(", *")
-            self.visit(node.dyn_args, frame)
-
-        if kwarg_workaround:
-            if node.dyn_kwargs is not None:
-                self.write(", **dict({")
-            else:
-                self.write(", **{")
-            for kwarg in node.kwargs:
-                self.write(f"{kwarg.key!r}: ")
-                self.visit(kwarg.value, frame)
-                self.write(", ")
-            if extra_kwargs is not None:
-                for key, value in extra_kwargs.items():
-                    self.write(f"{key!r}: {value}, ")
-            if node.dyn_kwargs is not None:
-                self.write("}, **")
-                self.visit(node.dyn_kwargs, frame)
-                self.write(")")
-            else:
-                self.write("}")
-
-        elif node.dyn_kwargs is not None:
-            self.write(", **")
-            self.visit(node.dyn_kwargs, frame)
-
-    def pull_dependencies(self, nodes):
-        """Pull all the dependencies."""
-        visitor = DependencyFinderVisitor()
-        for node in nodes:
-            visitor.visit(node)
-        for dependency in "filters", "tests":
-            mapping = getattr(self, dependency)
-            for name in getattr(visitor, dependency):
-                if name not in mapping:
-                    mapping[name] = self.temporary_identifier()
-                self.writeline(f"{mapping[name]} = environment.{dependency}[{name!r}]")
-
-    def enter_frame(self, frame):
-        undefs = []
-        for target, (action, param) in frame.symbols.loads.items():
-            if action == VAR_LOAD_PARAMETER:
-                pass
-            elif action == VAR_LOAD_RESOLVE:
-                self.writeline(f"{target} = {self.get_resolve_func()}({param!r})")
-            elif action == VAR_LOAD_ALIAS:
-                self.writeline(f"{target} = {param}")
-            elif action == VAR_LOAD_UNDEFINED:
-                undefs.append(target)
-            else:
-                raise NotImplementedError("unknown load instruction")
-        if undefs:
-            self.writeline(f"{' = '.join(undefs)} = missing")
-
-    def leave_frame(self, frame, with_python_scope=False):
-        if not with_python_scope:
-            undefs = []
-            for target in frame.symbols.loads:
-                undefs.append(target)
-            if undefs:
-                self.writeline(f"{' = '.join(undefs)} = missing")
-
-    def func(self, name):
-        if self.environment.is_async:
-            return f"async def {name}"
-        return f"def {name}"
-
-    def macro_body(self, node, frame):
-        """Dump the function def of a macro or call block."""
-        frame = frame.inner()
-        frame.symbols.analyze_node(node)
-        macro_ref = MacroRef(node)
-
-        explicit_caller = None
-        skip_special_params = set()
-        args = []
-        for idx, arg in enumerate(node.args):
-            if arg.name == "caller":
-                explicit_caller = idx
-            if arg.name in ("kwargs", "varargs"):
-                skip_special_params.add(arg.name)
-            args.append(frame.symbols.ref(arg.name))
-
-        undeclared = find_undeclared(node.body, ("caller", "kwargs", "varargs"))
-
-        if "caller" in undeclared:
-            # In older Jinja versions there was a bug that allowed caller
-            # to retain the special behavior even if it was mentioned in
-            # the argument list.  However thankfully this was only really
-            # working if it was the last argument.  So we are explicitly
-            # checking this now and error out if it is anywhere else in
-            # the argument list.
-            if explicit_caller is not None:
-                try:
-                    node.defaults[explicit_caller - len(node.args)]
-                except IndexError:
-                    self.fail(
-                        "When defining macros or call blocks the "
-                        'special "caller" argument must be omitted '
-                        "or be given a default.",
-                        node.lineno,
-                    )
-            else:
-                args.append(frame.symbols.declare_parameter("caller"))
-            macro_ref.accesses_caller = True
-        if "kwargs" in undeclared and "kwargs" not in skip_special_params:
-            args.append(frame.symbols.declare_parameter("kwargs"))
-            macro_ref.accesses_kwargs = True
-        if "varargs" in undeclared and "varargs" not in skip_special_params:
-            args.append(frame.symbols.declare_parameter("varargs"))
-            macro_ref.accesses_varargs = True
-
-        # macros are delayed, they never require output checks
-        frame.require_output_check = False
-        frame.symbols.analyze_node(node)
-        self.writeline(f"{self.func('macro')}({', '.join(args)}):", node)
-        self.indent()
-
-        self.buffer(frame)
-        self.enter_frame(frame)
-
-        self.push_parameter_definitions(frame)
-        for idx, arg in enumerate(node.args):
-            ref = frame.symbols.ref(arg.name)
-            self.writeline(f"if {ref} is missing:")
-            self.indent()
-            try:
-                default = node.defaults[idx - len(node.args)]
-            except IndexError:
-                self.writeline(
-                    f'{ref} = undefined("parameter {arg.name!r} was not provided",'
-                    f" name={arg.name!r})"
-                )
-            else:
-                self.writeline(f"{ref} = ")
-                self.visit(default, frame)
-            self.mark_parameter_stored(ref)
-            self.outdent()
-        self.pop_parameter_definitions()
-
-        self.blockvisit(node.body, frame)
-        self.return_buffer_contents(frame, force_unescaped=True)
-        self.leave_frame(frame, with_python_scope=True)
-        self.outdent()
-
-        return frame, macro_ref
-
-    def macro_def(self, macro_ref, frame):
-        """Dump the macro definition for the def created by macro_body."""
-        arg_tuple = ", ".join(repr(x.name) for x in macro_ref.node.args)
-        name = getattr(macro_ref.node, "name", None)
-        if len(macro_ref.node.args) == 1:
-            arg_tuple += ","
-        self.write(
-            f"Macro(environment, macro, {name!r}, ({arg_tuple}),"
-            f" {macro_ref.accesses_kwargs!r}, {macro_ref.accesses_varargs!r},"
-            f" {macro_ref.accesses_caller!r}, context.eval_ctx.autoescape)"
-        )
-
-    def position(self, node):
-        """Return a human readable position for the node."""
-        rv = f"line {node.lineno}"
-        if self.name is not None:
-            rv = f"{rv} in {self.name!r}"
-        return rv
-
-    def dump_local_context(self, frame):
-        items_kv = ", ".join(
-            f"{name!r}: {target}"
-            for name, target in frame.symbols.dump_stores().items()
-        )
-        return f"{{{items_kv}}}"
-
-    def write_commons(self):
-        """Writes a common preamble that is used by root and block functions.
-        Primarily this sets up common local helpers and enforces a generator
-        through a dead branch.
-        """
-        self.writeline("resolve = context.resolve_or_missing")
-        self.writeline("undefined = environment.undefined")
-        # always use the standard Undefined class for the implicit else of
-        # conditional expressions
-        self.writeline("cond_expr_undefined = Undefined")
-        self.writeline("if 0: yield None")
-
-    def push_parameter_definitions(self, frame):
-        """Pushes all parameter targets from the given frame into a local
-        stack that permits tracking of yet to be assigned parameters.  In
-        particular this enables the optimization from `visit_Name` to skip
-        undefined expressions for parameters in macros as macros can reference
-        otherwise unbound parameters.
-        """
-        self._param_def_block.append(frame.symbols.dump_param_targets())
-
-    def pop_parameter_definitions(self):
-        """Pops the current parameter definitions set."""
-        self._param_def_block.pop()
-
-    def mark_parameter_stored(self, target):
-        """Marks a parameter in the current parameter definitions as stored.
-        This will skip the enforced undefined checks.
-        """
-        if self._param_def_block:
-            self._param_def_block[-1].discard(target)
-
-    def push_context_reference(self, target):
-        self._context_reference_stack.append(target)
-
-    def pop_context_reference(self):
-        self._context_reference_stack.pop()
-
-    def get_context_ref(self):
-        return self._context_reference_stack[-1]
-
-    def get_resolve_func(self):
-        target = self._context_reference_stack[-1]
-        if target == "context":
-            return "resolve"
-        return f"{target}.resolve"
-
-    def derive_context(self, frame):
-        return f"{self.get_context_ref()}.derived({self.dump_local_context(frame)})"
-
-    def parameter_is_undeclared(self, target):
-        """Checks if a given target is an undeclared parameter."""
-        if not self._param_def_block:
-            return False
-        return target in self._param_def_block[-1]
-
-    def push_assign_tracking(self):
-        """Pushes a new layer for assignment tracking."""
-        self._assign_stack.append(set())
-
-    def pop_assign_tracking(self, frame):
-        """Pops the topmost level for assignment tracking and updates the
-        context variables if necessary.
-        """
-        vars = self._assign_stack.pop()
-        if not frame.toplevel or not vars:
-            return
-        public_names = [x for x in vars if x[:1] != "_"]
-        if len(vars) == 1:
-            name = next(iter(vars))
-            ref = frame.symbols.ref(name)
-            self.writeline(f"context.vars[{name!r}] = {ref}")
-        else:
-            self.writeline("context.vars.update({")
-            for idx, name in enumerate(vars):
-                if idx:
-                    self.write(", ")
-                ref = frame.symbols.ref(name)
-                self.write(f"{name!r}: {ref}")
-            self.write("})")
-        if public_names:
-            if len(public_names) == 1:
-                self.writeline(f"context.exported_vars.add({public_names[0]!r})")
-            else:
-                names_str = ", ".join(map(repr, public_names))
-                self.writeline(f"context.exported_vars.update(({names_str}))")
-
-    # -- Statement Visitors
-
-    def visit_Template(self, node, frame=None):
-        assert frame is None, "no root frame allowed"
-        eval_ctx = EvalContext(self.environment, self.name)
-
-        from .runtime import exported
-
-        self.writeline("from __future__ import generator_stop")  # Python < 3.7
-        self.writeline("from jinja2.runtime import " + ", ".join(exported))
-
-        if self.environment.is_async:
-            self.writeline(
-                "from jinja2.asyncsupport import auto_await, "
-                "auto_aiter, AsyncLoopContext"
-            )
-
-        # if we want a deferred initialization we cannot move the
-        # environment into a local name
-        envenv = "" if self.defer_init else ", environment=environment"
-
-        # do we have an extends tag at all?  If not, we can save some
-        # overhead by just not processing any inheritance code.
-        have_extends = node.find(nodes.Extends) is not None
-
-        # find all blocks
-        for block in node.find_all(nodes.Block):
-            if block.name in self.blocks:
-                self.fail(f"block {block.name!r} defined twice", block.lineno)
-            self.blocks[block.name] = block
-
-        # find all imports and import them
-        for import_ in node.find_all(nodes.ImportedName):
-            if import_.importname not in self.import_aliases:
-                imp = import_.importname
-                self.import_aliases[imp] = alias = self.temporary_identifier()
-                if "." in imp:
-                    module, obj = imp.rsplit(".", 1)
-                    self.writeline(f"from {module} import {obj} as {alias}")
-                else:
-                    self.writeline(f"import {imp} as {alias}")
-
-        # add the load name
-        self.writeline(f"name = {self.name!r}")
-
-        # generate the root render function.
-        self.writeline(
-            f"{self.func('root')}(context, missing=missing{envenv}):", extra=1
-        )
-        self.indent()
-        self.write_commons()
-
-        # process the root
-        frame = Frame(eval_ctx)
-        if "self" in find_undeclared(node.body, ("self",)):
-            ref = frame.symbols.declare_parameter("self")
-            self.writeline(f"{ref} = TemplateReference(context)")
-        frame.symbols.analyze_node(node)
-        frame.toplevel = frame.rootlevel = True
-        frame.require_output_check = have_extends and not self.has_known_extends
-        if have_extends:
-            self.writeline("parent_template = None")
-        self.enter_frame(frame)
-        self.pull_dependencies(node.body)
-        self.blockvisit(node.body, frame)
-        self.leave_frame(frame, with_python_scope=True)
-        self.outdent()
-
-        # make sure that the parent root is called.
-        if have_extends:
-            if not self.has_known_extends:
-                self.indent()
-                self.writeline("if parent_template is not None:")
-            self.indent()
-            if not self.environment.is_async:
-                self.writeline("yield from parent_template.root_render_func(context)")
-            else:
-                loop = "async for" if self.environment.is_async else "for"
-                self.writeline(
-                    f"{loop} event in parent_template.root_render_func(context):"
-                )
-                self.indent()
-                self.writeline("yield event")
-                self.outdent()
-            self.outdent(1 + (not self.has_known_extends))
-
-        # at this point we now have the blocks collected and can visit them too.
-        for name, block in self.blocks.items():
-            self.writeline(
-                f"{self.func('block_' + name)}(context, missing=missing{envenv}):",
-                block,
-                1,
-            )
-            self.indent()
-            self.write_commons()
-            # It's important that we do not make this frame a child of the
-            # toplevel template.  This would cause a variety of
-            # interesting issues with identifier tracking.
-            block_frame = Frame(eval_ctx)
-            undeclared = find_undeclared(block.body, ("self", "super"))
-            if "self" in undeclared:
-                ref = block_frame.symbols.declare_parameter("self")
-                self.writeline(f"{ref} = TemplateReference(context)")
-            if "super" in undeclared:
-                ref = block_frame.symbols.declare_parameter("super")
-                self.writeline(f"{ref} = context.super({name!r}, block_{name})")
-            block_frame.symbols.analyze_node(block)
-            block_frame.block = name
-            self.enter_frame(block_frame)
-            self.pull_dependencies(block.body)
-            self.blockvisit(block.body, block_frame)
-            self.leave_frame(block_frame, with_python_scope=True)
-            self.outdent()
-
-        blocks_kv_str = ", ".join(f"{x!r}: block_{x}" for x in self.blocks)
-        self.writeline(f"blocks = {{{blocks_kv_str}}}", extra=1)
-        debug_kv_str = "&".join(f"{k}={v}" for k, v in self.debug_info)
-        self.writeline(f"debug_info = {debug_kv_str!r}")
-
-    def visit_Block(self, node, frame):
-        """Call a block and register it for the template."""
-        level = 0
-        if frame.toplevel:
-            # if we know that we are a child template, there is no need to
-            # check if we are one
-            if self.has_known_extends:
-                return
-            if self.extends_so_far > 0:
-                self.writeline("if parent_template is None:")
-                self.indent()
-                level += 1
-
-        if node.scoped:
-            context = self.derive_context(frame)
-        else:
-            context = self.get_context_ref()
-
-        if not self.environment.is_async and frame.buffer is None:
-            self.writeline(
-                f"yield from context.blocks[{node.name!r}][0]({context})", node
-            )
-        else:
-            loop = "async for" if self.environment.is_async else "for"
-            self.writeline(
-                f"{loop} event in context.blocks[{node.name!r}][0]({context}):", node
-            )
-            self.indent()
-            self.simple_write("event", frame)
-            self.outdent()
-
-        self.outdent(level)
-
-    def visit_Extends(self, node, frame):
-        """Calls the extender."""
-        if not frame.toplevel:
-            self.fail("cannot use extend from a non top-level scope", node.lineno)
-
-        # if the number of extends statements in general is zero so
-        # far, we don't have to add a check if something extended
-        # the template before this one.
-        if self.extends_so_far > 0:
-
-            # if we have a known extends we just add a template runtime
-            # error into the generated code.  We could catch that at compile
-            # time too, but i welcome it not to confuse users by throwing the
-            # same error at different times just "because we can".
-            if not self.has_known_extends:
-                self.writeline("if parent_template is not None:")
-                self.indent()
-            self.writeline('raise TemplateRuntimeError("extended multiple times")')
-
-            # if we have a known extends already we don't need that code here
-            # as we know that the template execution will end here.
-            if self.has_known_extends:
-                raise CompilerExit()
-            else:
-                self.outdent()
-
-        self.writeline("parent_template = environment.get_template(", node)
-        self.visit(node.template, frame)
-        self.write(f", {self.name!r})")
-        self.writeline("for name, parent_block in parent_template.blocks.items():")
-        self.indent()
-        self.writeline("context.blocks.setdefault(name, []).append(parent_block)")
-        self.outdent()
-
-        # if this extends statement was in the root level we can take
-        # advantage of that information and simplify the generated code
-        # in the top level from this point onwards
-        if frame.rootlevel:
-            self.has_known_extends = True
-
-        # and now we have one more
-        self.extends_so_far += 1
-
-    def visit_Include(self, node, frame):
-        """Handles includes."""
-        if node.ignore_missing:
-            self.writeline("try:")
-            self.indent()
-
-        func_name = "get_or_select_template"
-        if isinstance(node.template, nodes.Const):
-            if isinstance(node.template.value, str):
-                func_name = "get_template"
-            elif isinstance(node.template.value, (tuple, list)):
-                func_name = "select_template"
-        elif isinstance(node.template, (nodes.Tuple, nodes.List)):
-            func_name = "select_template"
-
-        self.writeline(f"template = environment.{func_name}(", node)
-        self.visit(node.template, frame)
-        self.write(f", {self.name!r})")
-        if node.ignore_missing:
-            self.outdent()
-            self.writeline("except TemplateNotFound:")
-            self.indent()
-            self.writeline("pass")
-            self.outdent()
-            self.writeline("else:")
-            self.indent()
-
-        skip_event_yield = False
-        if node.with_context:
-            loop = "async for" if self.environment.is_async else "for"
-            self.writeline(
-                f"{loop} event in template.root_render_func("
-                "template.new_context(context.get_all(), True,"
-                f" {self.dump_local_context(frame)})):"
-            )
-        elif self.environment.is_async:
-            self.writeline(
-                "for event in (await template._get_default_module_async())"
-                "._body_stream:"
-            )
-        else:
-            self.writeline("yield from template._get_default_module()._body_stream")
-            skip_event_yield = True
-
-        if not skip_event_yield:
-            self.indent()
-            self.simple_write("event", frame)
-            self.outdent()
-
-        if node.ignore_missing:
-            self.outdent()
-
-    def visit_Import(self, node, frame):
-        """Visit regular imports."""
-        self.writeline(f"{frame.symbols.ref(node.target)} = ", node)
-        if frame.toplevel:
-            self.write(f"context.vars[{node.target!r}] = ")
-        if self.environment.is_async:
-            self.write("await ")
-        self.write("environment.get_template(")
-        self.visit(node.template, frame)
-        self.write(f", {self.name!r}).")
-        if node.with_context:
-            func = "make_module" + ("_async" if self.environment.is_async else "")
-            self.write(
-                f"{func}(context.get_all(), True, {self.dump_local_context(frame)})"
-            )
-        elif self.environment.is_async:
-            self.write("_get_default_module_async()")
-        else:
-            self.write("_get_default_module(context)")
-        if frame.toplevel and not node.target.startswith("_"):
-            self.writeline(f"context.exported_vars.discard({node.target!r})")
-
-    def visit_FromImport(self, node, frame):
-        """Visit named imports."""
-        self.newline(node)
-        prefix = "await " if self.environment.is_async else ""
-        self.write(f"included_template = {prefix}environment.get_template(")
-        self.visit(node.template, frame)
-        self.write(f", {self.name!r}).")
-        if node.with_context:
-            func = "make_module" + ("_async" if self.environment.is_async else "")
-            self.write(
-                f"{func}(context.get_all(), True, {self.dump_local_context(frame)})"
-            )
-        elif self.environment.is_async:
-            self.write("_get_default_module_async()")
-        else:
-            self.write("_get_default_module(context)")
-
-        var_names = []
-        discarded_names = []
-        for name in node.names:
-            if isinstance(name, tuple):
-                name, alias = name
-            else:
-                alias = name
-            self.writeline(
-                f"{frame.symbols.ref(alias)} ="
-                f" getattr(included_template, {name!r}, missing)"
-            )
-            self.writeline(f"if {frame.symbols.ref(alias)} is missing:")
-            self.indent()
-            message = (
-                "the template {included_template.__name__!r}"
-                f" (imported on {self.position(node)})"
-                f" does not export the requested name {name!r}"
-            )
-            self.writeline(
-                f"{frame.symbols.ref(alias)} = undefined(f{message!r}, name={name!r})"
-            )
-            self.outdent()
-            if frame.toplevel:
-                var_names.append(alias)
-                if not alias.startswith("_"):
-                    discarded_names.append(alias)
-
-        if var_names:
-            if len(var_names) == 1:
-                name = var_names[0]
-                self.writeline(f"context.vars[{name!r}] = {frame.symbols.ref(name)}")
-            else:
-                names_kv = ", ".join(
-                    f"{name!r}: {frame.symbols.ref(name)}" for name in var_names
-                )
-                self.writeline(f"context.vars.update({{{names_kv}}})")
-        if discarded_names:
-            if len(discarded_names) == 1:
-                self.writeline(f"context.exported_vars.discard({discarded_names[0]!r})")
-            else:
-                names_str = ", ".join(map(repr, discarded_names))
-                self.writeline(
-                    f"context.exported_vars.difference_update(({names_str}))"
-                )
-
-    def visit_For(self, node, frame):
-        loop_frame = frame.inner()
-        test_frame = frame.inner()
-        else_frame = frame.inner()
-
-        # try to figure out if we have an extended loop.  An extended loop
-        # is necessary if the loop is in recursive mode if the special loop
-        # variable is accessed in the body.
-        extended_loop = node.recursive or "loop" in find_undeclared(
-            node.iter_child_nodes(only=("body",)), ("loop",)
-        )
-
-        loop_ref = None
-        if extended_loop:
-            loop_ref = loop_frame.symbols.declare_parameter("loop")
-
-        loop_frame.symbols.analyze_node(node, for_branch="body")
-        if node.else_:
-            else_frame.symbols.analyze_node(node, for_branch="else")
-
-        if node.test:
-            loop_filter_func = self.temporary_identifier()
-            test_frame.symbols.analyze_node(node, for_branch="test")
-            self.writeline(f"{self.func(loop_filter_func)}(fiter):", node.test)
-            self.indent()
-            self.enter_frame(test_frame)
-            self.writeline("async for " if self.environment.is_async else "for ")
-            self.visit(node.target, loop_frame)
-            self.write(" in ")
-            self.write("auto_aiter(fiter)" if self.environment.is_async else "fiter")
-            self.write(":")
-            self.indent()
-            self.writeline("if ", node.test)
-            self.visit(node.test, test_frame)
-            self.write(":")
-            self.indent()
-            self.writeline("yield ")
-            self.visit(node.target, loop_frame)
-            self.outdent(3)
-            self.leave_frame(test_frame, with_python_scope=True)
-
-        # if we don't have an recursive loop we have to find the shadowed
-        # variables at that point.  Because loops can be nested but the loop
-        # variable is a special one we have to enforce aliasing for it.
-        if node.recursive:
-            self.writeline(
-                f"{self.func('loop')}(reciter, loop_render_func, depth=0):", node
-            )
-            self.indent()
-            self.buffer(loop_frame)
-
-            # Use the same buffer for the else frame
-            else_frame.buffer = loop_frame.buffer
-
-        # make sure the loop variable is a special one and raise a template
-        # assertion error if a loop tries to write to loop
-        if extended_loop:
-            self.writeline(f"{loop_ref} = missing")
-
-        for name in node.find_all(nodes.Name):
-            if name.ctx == "store" and name.name == "loop":
-                self.fail(
-                    "Can't assign to special loop variable in for-loop target",
-                    name.lineno,
-                )
-
-        if node.else_:
-            iteration_indicator = self.temporary_identifier()
-            self.writeline(f"{iteration_indicator} = 1")
-
-        self.writeline("async for " if self.environment.is_async else "for ", node)
-        self.visit(node.target, loop_frame)
-        if extended_loop:
-            prefix = "Async" if self.environment.is_async else ""
-            self.write(f", {loop_ref} in {prefix}LoopContext(")
-        else:
-            self.write(" in ")
-
-        if node.test:
-            self.write(f"{loop_filter_func}(")
-        if node.recursive:
-            self.write("reciter")
-        else:
-            if self.environment.is_async and not extended_loop:
-                self.write("auto_aiter(")
-            self.visit(node.iter, frame)
-            if self.environment.is_async and not extended_loop:
-                self.write(")")
-        if node.test:
-            self.write(")")
-
-        if node.recursive:
-            self.write(", undefined, loop_render_func, depth):")
-        else:
-            self.write(", undefined):" if extended_loop else ":")
-
-        self.indent()
-        self.enter_frame(loop_frame)
-
-        self.blockvisit(node.body, loop_frame)
-        if node.else_:
-            self.writeline(f"{iteration_indicator} = 0")
-        self.outdent()
-        self.leave_frame(
-            loop_frame, with_python_scope=node.recursive and not node.else_
-        )
-
-        if node.else_:
-            self.writeline(f"if {iteration_indicator}:")
-            self.indent()
-            self.enter_frame(else_frame)
-            self.blockvisit(node.else_, else_frame)
-            self.leave_frame(else_frame)
-            self.outdent()
-
-        # if the node was recursive we have to return the buffer contents
-        # and start the iteration code
-        if node.recursive:
-            self.return_buffer_contents(loop_frame)
-            self.outdent()
-            self.start_write(frame, node)
-            if self.environment.is_async:
-                self.write("await ")
-            self.write("loop(")
-            if self.environment.is_async:
-                self.write("auto_aiter(")
-            self.visit(node.iter, frame)
-            if self.environment.is_async:
-                self.write(")")
-            self.write(", loop)")
-            self.end_write(frame)
-
-    def visit_If(self, node, frame):
-        if_frame = frame.soft()
-        self.writeline("if ", node)
-        self.visit(node.test, if_frame)
-        self.write(":")
-        self.indent()
-        self.blockvisit(node.body, if_frame)
-        self.outdent()
-        for elif_ in node.elif_:
-            self.writeline("elif ", elif_)
-            self.visit(elif_.test, if_frame)
-            self.write(":")
-            self.indent()
-            self.blockvisit(elif_.body, if_frame)
-            self.outdent()
-        if node.else_:
-            self.writeline("else:")
-            self.indent()
-            self.blockvisit(node.else_, if_frame)
-            self.outdent()
-
-    def visit_Macro(self, node, frame):
-        macro_frame, macro_ref = self.macro_body(node, frame)
-        self.newline()
-        if frame.toplevel:
-            if not node.name.startswith("_"):
-                self.write(f"context.exported_vars.add({node.name!r})")
-            self.writeline(f"context.vars[{node.name!r}] = ")
-        self.write(f"{frame.symbols.ref(node.name)} = ")
-        self.macro_def(macro_ref, macro_frame)
-
-    def visit_CallBlock(self, node, frame):
-        call_frame, macro_ref = self.macro_body(node, frame)
-        self.writeline("caller = ")
-        self.macro_def(macro_ref, call_frame)
-        self.start_write(frame, node)
-        self.visit_Call(node.call, frame, forward_caller=True)
-        self.end_write(frame)
-
-    def visit_FilterBlock(self, node, frame):
-        filter_frame = frame.inner()
-        filter_frame.symbols.analyze_node(node)
-        self.enter_frame(filter_frame)
-        self.buffer(filter_frame)
-        self.blockvisit(node.body, filter_frame)
-        self.start_write(frame, node)
-        self.visit_Filter(node.filter, filter_frame)
-        self.end_write(frame)
-        self.leave_frame(filter_frame)
-
-    def visit_With(self, node, frame):
-        with_frame = frame.inner()
-        with_frame.symbols.analyze_node(node)
-        self.enter_frame(with_frame)
-        for target, expr in zip(node.targets, node.values):
-            self.newline()
-            self.visit(target, with_frame)
-            self.write(" = ")
-            self.visit(expr, frame)
-        self.blockvisit(node.body, with_frame)
-        self.leave_frame(with_frame)
-
-    def visit_ExprStmt(self, node, frame):
-        self.newline(node)
-        self.visit(node.node, frame)
-
-    _FinalizeInfo = namedtuple("_FinalizeInfo", ("const", "src"))
-    #: The default finalize function if the environment isn't configured
-    #: with one. Or if the environment has one, this is called on that
-    #: function's output for constants.
-    _default_finalize = str
-    _finalize = None
-
-    def _make_finalize(self):
-        """Build the finalize function to be used on constants and at
-        runtime. Cached so it's only created once for all output nodes.
-
-        Returns a ``namedtuple`` with the following attributes:
-
-        ``const``
-            A function to finalize constant data at compile time.
-
-        ``src``
-            Source code to output around nodes to be evaluated at
-            runtime.
-        """
-        if self._finalize is not None:
-            return self._finalize
-
-        finalize = default = self._default_finalize
-        src = None
-
-        if self.environment.finalize:
-            src = "environment.finalize("
-            env_finalize = self.environment.finalize
-
-            def finalize(value):
-                return default(env_finalize(value))
-
-            if getattr(env_finalize, "contextfunction", False) is True:
-                src += "context, "
-                finalize = None  # noqa: F811
-            elif getattr(env_finalize, "evalcontextfunction", False) is True:
-                src += "context.eval_ctx, "
-                finalize = None
-            elif getattr(env_finalize, "environmentfunction", False) is True:
-                src += "environment, "
-
-                def finalize(value):
-                    return default(env_finalize(self.environment, value))
-
-        self._finalize = self._FinalizeInfo(finalize, src)
-        return self._finalize
-
-    def _output_const_repr(self, group):
-        """Given a group of constant values converted from ``Output``
-        child nodes, produce a string to write to the template module
-        source.
-        """
-        return repr(concat(group))
-
-    def _output_child_to_const(self, node, frame, finalize):
-        """Try to optimize a child of an ``Output`` node by trying to
-        convert it to constant, finalized data at compile time.
-
-        If :exc:`Impossible` is raised, the node is not constant and
-        will be evaluated at runtime. Any other exception will also be
-        evaluated at runtime for easier debugging.
-        """
-        const = node.as_const(frame.eval_ctx)
-
-        if frame.eval_ctx.autoescape:
-            const = escape(const)
-
-        # Template data doesn't go through finalize.
-        if isinstance(node, nodes.TemplateData):
-            return str(const)
-
-        return finalize.const(const)
-
-    def _output_child_pre(self, node, frame, finalize):
-        """Output extra source code before visiting a child of an
-        ``Output`` node.
-        """
-        if frame.eval_ctx.volatile:
-            self.write("(escape if context.eval_ctx.autoescape else str)(")
-        elif frame.eval_ctx.autoescape:
-            self.write("escape(")
-        else:
-            self.write("str(")
-
-        if finalize.src is not None:
-            self.write(finalize.src)
-
-    def _output_child_post(self, node, frame, finalize):
-        """Output extra source code after visiting a child of an
-        ``Output`` node.
-        """
-        self.write(")")
-
-        if finalize.src is not None:
-            self.write(")")
-
-    def visit_Output(self, node, frame):
-        # If an extends is active, don't render outside a block.
-        if frame.require_output_check:
-            # A top-level extends is known to exist at compile time.
-            if self.has_known_extends:
-                return
-
-            self.writeline("if parent_template is None:")
-            self.indent()
-
-        finalize = self._make_finalize()
-        body = []
-
-        # Evaluate constants at compile time if possible. Each item in
-        # body will be either a list of static data or a node to be
-        # evaluated at runtime.
-        for child in node.nodes:
-            try:
-                if not (
-                    # If the finalize function requires runtime context,
-                    # constants can't be evaluated at compile time.
-                    finalize.const
-                    # Unless it's basic template data that won't be
-                    # finalized anyway.
-                    or isinstance(child, nodes.TemplateData)
-                ):
-                    raise nodes.Impossible()
-
-                const = self._output_child_to_const(child, frame, finalize)
-            except (nodes.Impossible, Exception):
-                # The node was not constant and needs to be evaluated at
-                # runtime. Or another error was raised, which is easier
-                # to debug at runtime.
-                body.append(child)
-                continue
-
-            if body and isinstance(body[-1], list):
-                body[-1].append(const)
-            else:
-                body.append([const])
-
-        if frame.buffer is not None:
-            if len(body) == 1:
-                self.writeline(f"{frame.buffer}.append(")
-            else:
-                self.writeline(f"{frame.buffer}.extend((")
-
-            self.indent()
-
-        for item in body:
-            if isinstance(item, list):
-                # A group of constant data to join and output.
-                val = self._output_const_repr(item)
-
-                if frame.buffer is None:
-                    self.writeline("yield " + val)
-                else:
-                    self.writeline(val + ",")
-            else:
-                if frame.buffer is None:
-                    self.writeline("yield ", item)
-                else:
-                    self.newline(item)
-
-                # A node to be evaluated at runtime.
-                self._output_child_pre(item, frame, finalize)
-                self.visit(item, frame)
-                self._output_child_post(item, frame, finalize)
-
-                if frame.buffer is not None:
-                    self.write(",")
-
-        if frame.buffer is not None:
-            self.outdent()
-            self.writeline(")" if len(body) == 1 else "))")
-
-        if frame.require_output_check:
-            self.outdent()
-
-    def visit_Assign(self, node, frame):
-        self.push_assign_tracking()
-        self.newline(node)
-        self.visit(node.target, frame)
-        self.write(" = ")
-        self.visit(node.node, frame)
-        self.pop_assign_tracking(frame)
-
-    def visit_AssignBlock(self, node, frame):
-        self.push_assign_tracking()
-        block_frame = frame.inner()
-        # This is a special case.  Since a set block always captures we
-        # will disable output checks.  This way one can use set blocks
-        # toplevel even in extended templates.
-        block_frame.require_output_check = False
-        block_frame.symbols.analyze_node(node)
-        self.enter_frame(block_frame)
-        self.buffer(block_frame)
-        self.blockvisit(node.body, block_frame)
-        self.newline(node)
-        self.visit(node.target, frame)
-        self.write(" = (Markup if context.eval_ctx.autoescape else identity)(")
-        if node.filter is not None:
-            self.visit_Filter(node.filter, block_frame)
-        else:
-            self.write(f"concat({block_frame.buffer})")
-        self.write(")")
-        self.pop_assign_tracking(frame)
-        self.leave_frame(block_frame)
-
-    # -- Expression Visitors
-
-    def visit_Name(self, node, frame):
-        if node.ctx == "store" and frame.toplevel:
-            if self._assign_stack:
-                self._assign_stack[-1].add(node.name)
-        ref = frame.symbols.ref(node.name)
-
-        # If we are looking up a variable we might have to deal with the
-        # case where it's undefined.  We can skip that case if the load
-        # instruction indicates a parameter which are always defined.
-        if node.ctx == "load":
-            load = frame.symbols.find_load(ref)
-            if not (
-                load is not None
-                and load[0] == VAR_LOAD_PARAMETER
-                and not self.parameter_is_undeclared(ref)
-            ):
-                self.write(
-                    f"(undefined(name={node.name!r}) if {ref} is missing else {ref})"
-                )
-                return
-
-        self.write(ref)
-
-    def visit_NSRef(self, node, frame):
-        # NSRefs can only be used to store values; since they use the normal
-        # `foo.bar` notation they will be parsed as a normal attribute access
-        # when used anywhere but in a `set` context
-        ref = frame.symbols.ref(node.name)
-        self.writeline(f"if not isinstance({ref}, Namespace):")
-        self.indent()
-        self.writeline(
-            "raise TemplateRuntimeError"
-            '("cannot assign attribute on non-namespace object")'
-        )
-        self.outdent()
-        self.writeline(f"{ref}[{node.attr!r}]")
-
-    def visit_Const(self, node, frame):
-        val = node.as_const(frame.eval_ctx)
-        if isinstance(val, float):
-            self.write(str(val))
-        else:
-            self.write(repr(val))
-
-    def visit_TemplateData(self, node, frame):
-        try:
-            self.write(repr(node.as_const(frame.eval_ctx)))
-        except nodes.Impossible:
-            self.write(
-                f"(Markup if context.eval_ctx.autoescape else identity)({node.data!r})"
-            )
-
-    def visit_Tuple(self, node, frame):
-        self.write("(")
-        idx = -1
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(", ")
-            self.visit(item, frame)
-        self.write(",)" if idx == 0 else ")")
-
-    def visit_List(self, node, frame):
-        self.write("[")
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(", ")
-            self.visit(item, frame)
-        self.write("]")
-
-    def visit_Dict(self, node, frame):
-        self.write("{")
-        for idx, item in enumerate(node.items):
-            if idx:
-                self.write(", ")
-            self.visit(item.key, frame)
-            self.write(": ")
-            self.visit(item.value, frame)
-        self.write("}")
-
-    def binop(operator, interceptable=True):  # noqa: B902
-        @optimizeconst
-        def visitor(self, node, frame):
-            if (
-                self.environment.sandboxed
-                and operator in self.environment.intercepted_binops
-            ):
-                self.write(f"environment.call_binop(context, {operator!r}, ")
-                self.visit(node.left, frame)
-                self.write(", ")
-                self.visit(node.right, frame)
-            else:
-                self.write("(")
-                self.visit(node.left, frame)
-                self.write(f" {operator} ")
-                self.visit(node.right, frame)
-            self.write(")")
-
-        return visitor
-
-    def uaop(operator, interceptable=True):  # noqa: B902
-        @optimizeconst
-        def visitor(self, node, frame):
-            if (
-                self.environment.sandboxed
-                and operator in self.environment.intercepted_unops
-            ):
-                self.write(f"environment.call_unop(context, {operator!r}, ")
-                self.visit(node.node, frame)
-            else:
-                self.write("(" + operator)
-                self.visit(node.node, frame)
-            self.write(")")
-
-        return visitor
-
-    visit_Add = binop("+")
-    visit_Sub = binop("-")
-    visit_Mul = binop("*")
-    visit_Div = binop("/")
-    visit_FloorDiv = binop("//")
-    visit_Pow = binop("**")
-    visit_Mod = binop("%")
-    visit_And = binop("and", interceptable=False)
-    visit_Or = binop("or", interceptable=False)
-    visit_Pos = uaop("+")
-    visit_Neg = uaop("-")
-    visit_Not = uaop("not ", interceptable=False)
-    del binop, uaop
-
-    @optimizeconst
-    def visit_Concat(self, node, frame):
-        if frame.eval_ctx.volatile:
-            func_name = "(markup_join if context.eval_ctx.volatile else str_join)"
-        elif frame.eval_ctx.autoescape:
-            func_name = "markup_join"
-        else:
-            func_name = "str_join"
-        self.write(f"{func_name}((")
-        for arg in node.nodes:
-            self.visit(arg, frame)
-            self.write(", ")
-        self.write("))")
-
-    @optimizeconst
-    def visit_Compare(self, node, frame):
-        self.write("(")
-        self.visit(node.expr, frame)
-        for op in node.ops:
-            self.visit(op, frame)
-        self.write(")")
-
-    def visit_Operand(self, node, frame):
-        self.write(f" {operators[node.op]} ")
-        self.visit(node.expr, frame)
-
-    @optimizeconst
-    def visit_Getattr(self, node, frame):
-        if self.environment.is_async:
-            self.write("(await auto_await(")
-
-        self.write("environment.getattr(")
-        self.visit(node.node, frame)
-        self.write(f", {node.attr!r})")
-
-        if self.environment.is_async:
-            self.write("))")
-
-    @optimizeconst
-    def visit_Getitem(self, node, frame):
-        # slices bypass the environment getitem method.
-        if isinstance(node.arg, nodes.Slice):
-            self.visit(node.node, frame)
-            self.write("[")
-            self.visit(node.arg, frame)
-            self.write("]")
-        else:
-            if self.environment.is_async:
-                self.write("(await auto_await(")
-
-            self.write("environment.getitem(")
-            self.visit(node.node, frame)
-            self.write(", ")
-            self.visit(node.arg, frame)
-            self.write(")")
-
-            if self.environment.is_async:
-                self.write("))")
-
-    def visit_Slice(self, node, frame):
-        if node.start is not None:
-            self.visit(node.start, frame)
-        self.write(":")
-        if node.stop is not None:
-            self.visit(node.stop, frame)
-        if node.step is not None:
-            self.write(":")
-            self.visit(node.step, frame)
-
-    @optimizeconst
-    def visit_Filter(self, node, frame):
-        if self.environment.is_async:
-            self.write("await auto_await(")
-        self.write(self.filters[node.name] + "(")
-        func = self.environment.filters.get(node.name)
-        if func is None:
-            self.fail(f"no filter named {node.name!r}", node.lineno)
-        if getattr(func, "contextfilter", False) is True:
-            self.write("context, ")
-        elif getattr(func, "evalcontextfilter", False) is True:
-            self.write("context.eval_ctx, ")
-        elif getattr(func, "environmentfilter", False) is True:
-            self.write("environment, ")
-
-        # if the filter node is None we are inside a filter block
-        # and want to write to the current buffer
-        if node.node is not None:
-            self.visit(node.node, frame)
-        elif frame.eval_ctx.volatile:
-            self.write(
-                f"(Markup(concat({frame.buffer}))"
-                f" if context.eval_ctx.autoescape else concat({frame.buffer}))"
-            )
-        elif frame.eval_ctx.autoescape:
-            self.write(f"Markup(concat({frame.buffer}))")
-        else:
-            self.write(f"concat({frame.buffer})")
-        self.signature(node, frame)
-        self.write(")")
-        if self.environment.is_async:
-            self.write(")")
-
-    @optimizeconst
-    def visit_Test(self, node, frame):
-        self.write(self.tests[node.name] + "(")
-        if node.name not in self.environment.tests:
-            self.fail(f"no test named {node.name!r}", node.lineno)
-        self.visit(node.node, frame)
-        self.signature(node, frame)
-        self.write(")")
-
-    @optimizeconst
-    def visit_CondExpr(self, node, frame):
-        def write_expr2():
-            if node.expr2 is not None:
-                return self.visit(node.expr2, frame)
-            self.write(
-                f'cond_expr_undefined("the inline if-expression on'
-                f" {self.position(node)} evaluated to false and no else"
-                f' section was defined.")'
-            )
-
-        self.write("(")
-        self.visit(node.expr1, frame)
-        self.write(" if ")
-        self.visit(node.test, frame)
-        self.write(" else ")
-        write_expr2()
-        self.write(")")
-
-    @optimizeconst
-    def visit_Call(self, node, frame, forward_caller=False):
-        if self.environment.is_async:
-            self.write("await auto_await(")
-        if self.environment.sandboxed:
-            self.write("environment.call(context, ")
-        else:
-            self.write("context.call(")
-        self.visit(node.node, frame)
-        extra_kwargs = {"caller": "caller"} if forward_caller else None
-        self.signature(node, frame, extra_kwargs)
-        self.write(")")
-        if self.environment.is_async:
-            self.write(")")
-
-    def visit_Keyword(self, node, frame):
-        self.write(node.key + "=")
-        self.visit(node.value, frame)
-
-    # -- Unused nodes for extensions
-
-    def visit_MarkSafe(self, node, frame):
-        self.write("Markup(")
-        self.visit(node.expr, frame)
-        self.write(")")
-
-    def visit_MarkSafeIfAutoescape(self, node, frame):
-        self.write("(Markup if context.eval_ctx.autoescape else identity)(")
-        self.visit(node.expr, frame)
-        self.write(")")
-
-    def visit_EnvironmentAttribute(self, node, frame):
-        self.write("environment." + node.name)
-
-    def visit_ExtensionAttribute(self, node, frame):
-        self.write(f"environment.extensions[{node.identifier!r}].{node.name}")
-
-    def visit_ImportedName(self, node, frame):
-        self.write(self.import_aliases[node.importname])
-
-    def visit_InternalName(self, node, frame):
-        self.write(node.name)
-
-    def visit_ContextReference(self, node, frame):
-        self.write("context")
-
-    def visit_DerivedContextReference(self, node, frame):
-        self.write(self.derive_context(frame))
-
-    def visit_Continue(self, node, frame):
-        self.writeline("continue", node)
-
-    def visit_Break(self, node, frame):
-        self.writeline("break", node)
-
-    def visit_Scope(self, node, frame):
-        scope_frame = frame.inner()
-        scope_frame.symbols.analyze_node(node)
-        self.enter_frame(scope_frame)
-        self.blockvisit(node.body, scope_frame)
-        self.leave_frame(scope_frame)
-
-    def visit_OverlayScope(self, node, frame):
-        ctx = self.temporary_identifier()
-        self.writeline(f"{ctx} = {self.derive_context(frame)}")
-        self.writeline(f"{ctx}.vars = ")
-        self.visit(node.context, frame)
-        self.push_context_reference(ctx)
-
-        scope_frame = frame.inner(isolated=True)
-        scope_frame.symbols.analyze_node(node)
-        self.enter_frame(scope_frame)
-        self.blockvisit(node.body, scope_frame)
-        self.leave_frame(scope_frame)
-        self.pop_context_reference()
-
-    def visit_EvalContextModifier(self, node, frame):
-        for keyword in node.options:
-            self.writeline(f"context.eval_ctx.{keyword.key} = ")
-            self.visit(keyword.value, frame)
-            try:
-                val = keyword.value.as_const(frame.eval_ctx)
-            except nodes.Impossible:
-                frame.eval_ctx.volatile = True
-            else:
-                setattr(frame.eval_ctx, keyword.key, val)
-
-    def visit_ScopedEvalContextModifier(self, node, frame):
-        old_ctx_name = self.temporary_identifier()
-        saved_ctx = frame.eval_ctx.save()
-        self.writeline(f"{old_ctx_name} = context.eval_ctx.save()")
-        self.visit_EvalContextModifier(node, frame)
-        for child in node.body:
-            self.visit(child, frame)
-        frame.eval_ctx.revert(saved_ctx)
-        self.writeline(f"context.eval_ctx.revert({old_ctx_name})")
diff --git a/src/jinja2/constants.py b/src/jinja2/constants.py
deleted file mode 100644
index 41a1c23b..00000000
--- a/src/jinja2/constants.py
+++ /dev/null
@@ -1,20 +0,0 @@
-#: list of lorem ipsum words used by the lipsum() helper function
-LOREM_IPSUM_WORDS = """\
-a ac accumsan ad adipiscing aenean aliquam aliquet amet ante aptent arcu at
-auctor augue bibendum blandit class commodo condimentum congue consectetuer
-consequat conubia convallis cras cubilia cum curabitur curae cursus dapibus
-diam dictum dictumst dignissim dis dolor donec dui duis egestas eget eleifend
-elementum elit enim erat eros est et etiam eu euismod facilisi facilisis fames
-faucibus felis fermentum feugiat fringilla fusce gravida habitant habitasse hac
-hendrerit hymenaeos iaculis id imperdiet in inceptos integer interdum ipsum
-justo lacinia lacus laoreet lectus leo libero ligula litora lobortis lorem
-luctus maecenas magna magnis malesuada massa mattis mauris metus mi molestie
-mollis montes morbi mus nam nascetur natoque nec neque netus nibh nisi nisl non
-nonummy nostra nulla nullam nunc odio orci ornare parturient pede pellentesque
-penatibus per pharetra phasellus placerat platea porta porttitor posuere
-potenti praesent pretium primis proin pulvinar purus quam quis quisque rhoncus
-ridiculus risus rutrum sagittis sapien scelerisque sed sem semper senectus sit
-sociis sociosqu sodales sollicitudin suscipit suspendisse taciti tellus tempor
-tempus tincidunt torquent tortor tristique turpis ullamcorper ultrices
-ultricies urna ut varius vehicula vel velit venenatis vestibulum vitae vivamus
-viverra volutpat vulputate"""
diff --git a/src/jinja2/debug.py b/src/jinja2/debug.py
deleted file mode 100644
index 5cac28ba..00000000
--- a/src/jinja2/debug.py
+++ /dev/null
@@ -1,261 +0,0 @@
-import platform
-import sys
-from types import CodeType
-
-from . import TemplateSyntaxError
-from .utils import internal_code
-from .utils import missing
-
-
-def rewrite_traceback_stack(source=None):
-    """Rewrite the current exception to replace any tracebacks from
-    within compiled template code with tracebacks that look like they
-    came from the template source.
-
-    This must be called within an ``except`` block.
-
-    :param source: For ``TemplateSyntaxError``, the original source if
-        known.
-    :return: The original exception with the rewritten traceback.
-    """
-    _, exc_value, tb = sys.exc_info()
-
-    if isinstance(exc_value, TemplateSyntaxError) and not exc_value.translated:
-        exc_value.translated = True
-        exc_value.source = source
-        # Remove the old traceback, otherwise the frames from the
-        # compiler still show up.
-        exc_value.with_traceback(None)
-        # Outside of runtime, so the frame isn't executing template
-        # code, but it still needs to point at the template.
-        tb = fake_traceback(
-            exc_value, None, exc_value.filename or "<unknown>", exc_value.lineno
-        )
-    else:
-        # Skip the frame for the render function.
-        tb = tb.tb_next
-
-    stack = []
-
-    # Build the stack of traceback object, replacing any in template
-    # code with the source file and line information.
-    while tb is not None:
-        # Skip frames decorated with @internalcode. These are internal
-        # calls that aren't useful in template debugging output.
-        if tb.tb_frame.f_code in internal_code:
-            tb = tb.tb_next
-            continue
-
-        template = tb.tb_frame.f_globals.get("__jinja_template__")
-
-        if template is not None:
-            lineno = template.get_corresponding_lineno(tb.tb_lineno)
-            fake_tb = fake_traceback(exc_value, tb, template.filename, lineno)
-            stack.append(fake_tb)
-        else:
-            stack.append(tb)
-
-        tb = tb.tb_next
-
-    tb_next = None
-
-    # Assign tb_next in reverse to avoid circular references.
-    for tb in reversed(stack):
-        tb_next = tb_set_next(tb, tb_next)
-
-    return exc_value.with_traceback(tb_next)
-
-
-def fake_traceback(exc_value, tb, filename, lineno):
-    """Produce a new traceback object that looks like it came from the
-    template source instead of the compiled code. The filename, line
-    number, and location name will point to the template, and the local
-    variables will be the current template context.
-
-    :param exc_value: The original exception to be re-raised to create
-        the new traceback.
-    :param tb: The original traceback to get the local variables and
-        code info from.
-    :param filename: The template filename.
-    :param lineno: The line number in the template source.
-    """
-    if tb is not None:
-        # Replace the real locals with the context that would be
-        # available at that point in the template.
-        locals = get_template_locals(tb.tb_frame.f_locals)
-        locals.pop("__jinja_exception__", None)
-    else:
-        locals = {}
-
-    globals = {
-        "__name__": filename,
-        "__file__": filename,
-        "__jinja_exception__": exc_value,
-    }
-    # Raise an exception at the correct line number.
-    code = compile("\n" * (lineno - 1) + "raise __jinja_exception__", filename, "exec")
-
-    # Build a new code object that points to the template file and
-    # replaces the location with a block name.
-    try:
-        location = "template"
-
-        if tb is not None:
-            function = tb.tb_frame.f_code.co_name
-
-            if function == "root":
-                location = "top-level template code"
-            elif function.startswith("block_"):
-                location = f"block {function[6:]!r}"
-
-        # Collect arguments for the new code object. CodeType only
-        # accepts positional arguments, and arguments were inserted in
-        # new Python versions.
-        code_args = []
-
-        for attr in (
-            "argcount",
-            "posonlyargcount",  # Python 3.8
-            "kwonlyargcount",
-            "nlocals",
-            "stacksize",
-            "flags",
-            "code",  # codestring
-            "consts",  # constants
-            "names",
-            "varnames",
-            ("filename", filename),
-            ("name", location),
-            "firstlineno",
-            "lnotab",
-            "freevars",
-            "cellvars",
-        ):
-            if isinstance(attr, tuple):
-                # Replace with given value.
-                code_args.append(attr[1])
-                continue
-
-            try:
-                # Copy original value if it exists.
-                code_args.append(getattr(code, "co_" + attr))
-            except AttributeError:
-                # Some arguments were added later.
-                continue
-
-        code = CodeType(*code_args)
-    except Exception:
-        # Some environments such as Google App Engine don't support
-        # modifying code objects.
-        pass
-
-    # Execute the new code, which is guaranteed to raise, and return
-    # the new traceback without this frame.
-    try:
-        exec(code, globals, locals)
-    except BaseException:
-        return sys.exc_info()[2].tb_next
-
-
-def get_template_locals(real_locals):
-    """Based on the runtime locals, get the context that would be
-    available at that point in the template.
-    """
-    # Start with the current template context.
-    ctx = real_locals.get("context")
-
-    if ctx:
-        data = ctx.get_all().copy()
-    else:
-        data = {}
-
-    # Might be in a derived context that only sets local variables
-    # rather than pushing a context. Local variables follow the scheme
-    # l_depth_name. Find the highest-depth local that has a value for
-    # each name.
-    local_overrides = {}
-
-    for name, value in real_locals.items():
-        if not name.startswith("l_") or value is missing:
-            # Not a template variable, or no longer relevant.
-            continue
-
-        try:
-            _, depth, name = name.split("_", 2)
-            depth = int(depth)
-        except ValueError:
-            continue
-
-        cur_depth = local_overrides.get(name, (-1,))[0]
-
-        if cur_depth < depth:
-            local_overrides[name] = (depth, value)
-
-    # Modify the context with any derived context.
-    for name, (_, value) in local_overrides.items():
-        if value is missing:
-            data.pop(name, None)
-        else:
-            data[name] = value
-
-    return data
-
-
-if sys.version_info >= (3, 7):
-    # tb_next is directly assignable as of Python 3.7
-    def tb_set_next(tb, tb_next):
-        tb.tb_next = tb_next
-        return tb
-
-
-elif platform.python_implementation() == "PyPy":
-    # PyPy might have special support, and won't work with ctypes.
-    try:
-        import tputil
-    except ImportError:
-        # Without tproxy support, use the original traceback.
-        def tb_set_next(tb, tb_next):
-            return tb
-
-    else:
-        # With tproxy support, create a proxy around the traceback that
-        # returns the new tb_next.
-        def tb_set_next(tb, tb_next):
-            def controller(op):
-                if op.opname == "__getattribute__" and op.args[0] == "tb_next":
-                    return tb_next
-
-                return op.delegate()
-
-            return tputil.make_proxy(controller, obj=tb)
-
-
-else:
-    # Use ctypes to assign tb_next at the C level since it's read-only
-    # from Python.
-    import ctypes
-
-    class _CTraceback(ctypes.Structure):
-        _fields_ = [
-            # Extra PyObject slots when compiled with Py_TRACE_REFS.
-            ("PyObject_HEAD", ctypes.c_byte * object().__sizeof__()),
-            # Only care about tb_next as an object, not a traceback.
-            ("tb_next", ctypes.py_object),
-        ]
-
-    def tb_set_next(tb, tb_next):
-        c_tb = _CTraceback.from_address(id(tb))
-
-        # Clear out the old tb_next.
-        if tb.tb_next is not None:
-            c_tb_next = ctypes.py_object(tb.tb_next)
-            c_tb.tb_next = ctypes.py_object()
-            ctypes.pythonapi.Py_DecRef(c_tb_next)
-
-        # Assign the new tb_next.
-        if tb_next is not None:
-            c_tb_next = ctypes.py_object(tb_next)
-            ctypes.pythonapi.Py_IncRef(c_tb_next)
-            c_tb.tb_next = c_tb_next
-
-        return tb
diff --git a/src/jinja2/defaults.py b/src/jinja2/defaults.py
deleted file mode 100644
index 1f0b0ab0..00000000
--- a/src/jinja2/defaults.py
+++ /dev/null
@@ -1,42 +0,0 @@
-from .filters import FILTERS as DEFAULT_FILTERS  # noqa: F401
-from .tests import TESTS as DEFAULT_TESTS  # noqa: F401
-from .utils import Cycler
-from .utils import generate_lorem_ipsum
-from .utils import Joiner
-from .utils import Namespace
-
-# defaults for the parser / lexer
-BLOCK_START_STRING = "{%"
-BLOCK_END_STRING = "%}"
-VARIABLE_START_STRING = "{{"
-VARIABLE_END_STRING = "}}"
-COMMENT_START_STRING = "{#"
-COMMENT_END_STRING = "#}"
-LINE_STATEMENT_PREFIX = None
-LINE_COMMENT_PREFIX = None
-TRIM_BLOCKS = False
-LSTRIP_BLOCKS = False
-NEWLINE_SEQUENCE = "\n"
-KEEP_TRAILING_NEWLINE = False
-
-# default filters, tests and namespace
-
-DEFAULT_NAMESPACE = {
-    "range": range,
-    "dict": dict,
-    "lipsum": generate_lorem_ipsum,
-    "cycler": Cycler,
-    "joiner": Joiner,
-    "namespace": Namespace,
-}
-
-# default policies
-DEFAULT_POLICIES = {
-    "compiler.ascii_str": True,
-    "urlize.rel": "noopener",
-    "urlize.target": None,
-    "truncate.leeway": 5,
-    "json.dumps_function": None,
-    "json.dumps_kwargs": {"sort_keys": True},
-    "ext.i18n.trimmed": False,
-}
diff --git a/src/jinja2/environment.py b/src/jinja2/environment.py
deleted file mode 100644
index 556f7255..00000000
--- a/src/jinja2/environment.py
+++ /dev/null
@@ -1,1331 +0,0 @@
-"""Classes for managing templates and their runtime and compile time
-options.
-"""
-import os
-import sys
-import weakref
-from functools import partial
-from functools import reduce
-
-from markupsafe import Markup
-
-from . import nodes
-from .compiler import CodeGenerator
-from .compiler import generate
-from .defaults import BLOCK_END_STRING
-from .defaults import BLOCK_START_STRING
-from .defaults import COMMENT_END_STRING
-from .defaults import COMMENT_START_STRING
-from .defaults import DEFAULT_FILTERS
-from .defaults import DEFAULT_NAMESPACE
-from .defaults import DEFAULT_POLICIES
-from .defaults import DEFAULT_TESTS
-from .defaults import KEEP_TRAILING_NEWLINE
-from .defaults import LINE_COMMENT_PREFIX
-from .defaults import LINE_STATEMENT_PREFIX
-from .defaults import LSTRIP_BLOCKS
-from .defaults import NEWLINE_SEQUENCE
-from .defaults import TRIM_BLOCKS
-from .defaults import VARIABLE_END_STRING
-from .defaults import VARIABLE_START_STRING
-from .exceptions import TemplateNotFound
-from .exceptions import TemplateRuntimeError
-from .exceptions import TemplatesNotFound
-from .exceptions import TemplateSyntaxError
-from .exceptions import UndefinedError
-from .lexer import get_lexer
-from .lexer import TokenStream
-from .nodes import EvalContext
-from .parser import Parser
-from .runtime import Context
-from .runtime import new_context
-from .runtime import Undefined
-from .utils import concat
-from .utils import consume
-from .utils import have_async_gen
-from .utils import import_string
-from .utils import internalcode
-from .utils import LRUCache
-from .utils import missing
-
-# for direct template usage we have up to ten living environments
-_spontaneous_environments = LRUCache(10)
-
-
-def get_spontaneous_environment(cls, *args):
-    """Return a new spontaneous environment. A spontaneous environment
-    is used for templates created directly rather than through an
-    existing environment.
-
-    :param cls: Environment class to create.
-    :param args: Positional arguments passed to environment.
-    """
-    key = (cls, args)
-
-    try:
-        return _spontaneous_environments[key]
-    except KeyError:
-        _spontaneous_environments[key] = env = cls(*args)
-        env.shared = True
-        return env
-
-
-def create_cache(size):
-    """Return the cache class for the given size."""
-    if size == 0:
-        return None
-    if size < 0:
-        return {}
-    return LRUCache(size)
-
-
-def copy_cache(cache):
-    """Create an empty copy of the given cache."""
-    if cache is None:
-        return None
-    elif type(cache) is dict:
-        return {}
-    return LRUCache(cache.capacity)
-
-
-def load_extensions(environment, extensions):
-    """Load the extensions from the list and bind it to the environment.
-    Returns a dict of instantiated environments.
-    """
-    result = {}
-    for extension in extensions:
-        if isinstance(extension, str):
-            extension = import_string(extension)
-        result[extension.identifier] = extension(environment)
-    return result
-
-
-def fail_for_missing_callable(thing, name):
-    msg = f"no {thing} named {name!r}"
-
-    if isinstance(name, Undefined):
-        try:
-            name._fail_with_undefined_error()
-        except Exception as e:
-            msg = f"{msg} ({e}; did you forget to quote the callable name?)"
-    raise TemplateRuntimeError(msg)
-
-
-def _environment_sanity_check(environment):
-    """Perform a sanity check on the environment."""
-    assert issubclass(
-        environment.undefined, Undefined
-    ), "undefined must be a subclass of undefined because filters depend on it."
-    assert (
-        environment.block_start_string
-        != environment.variable_start_string
-        != environment.comment_start_string
-    ), "block, variable and comment start strings must be different"
-    assert environment.newline_sequence in {
-        "\r",
-        "\r\n",
-        "\n",
-    }, "newline_sequence set to unknown line ending string."
-    return environment
-
-
-class Environment:
-    r"""The core component of Jinja is the `Environment`.  It contains
-    important shared variables like configuration, filters, tests,
-    globals and others.  Instances of this class may be modified if
-    they are not shared and if no template was loaded so far.
-    Modifications on environments after the first template was loaded
-    will lead to surprising effects and undefined behavior.
-
-    Here are the possible initialization parameters:
-
-        `block_start_string`
-            The string marking the beginning of a block.  Defaults to ``'{%'``.
-
-        `block_end_string`
-            The string marking the end of a block.  Defaults to ``'%}'``.
-
-        `variable_start_string`
-            The string marking the beginning of a print statement.
-            Defaults to ``'{{'``.
-
-        `variable_end_string`
-            The string marking the end of a print statement.  Defaults to
-            ``'}}'``.
-
-        `comment_start_string`
-            The string marking the beginning of a comment.  Defaults to ``'{#'``.
-
-        `comment_end_string`
-            The string marking the end of a comment.  Defaults to ``'#}'``.
-
-        `line_statement_prefix`
-            If given and a string, this will be used as prefix for line based
-            statements.  See also :ref:`line-statements`.
-
-        `line_comment_prefix`
-            If given and a string, this will be used as prefix for line based
-            comments.  See also :ref:`line-statements`.
-
-            .. versionadded:: 2.2
-
-        `trim_blocks`
-            If this is set to ``True`` the first newline after a block is
-            removed (block, not variable tag!).  Defaults to `False`.
-
-        `lstrip_blocks`
-            If this is set to ``True`` leading spaces and tabs are stripped
-            from the start of a line to a block.  Defaults to `False`.
-
-        `newline_sequence`
-            The sequence that starts a newline.  Must be one of ``'\r'``,
-            ``'\n'`` or ``'\r\n'``.  The default is ``'\n'`` which is a
-            useful default for Linux and OS X systems as well as web
-            applications.
-
-        `keep_trailing_newline`
-            Preserve the trailing newline when rendering templates.
-            The default is ``False``, which causes a single newline,
-            if present, to be stripped from the end of the template.
-
-            .. versionadded:: 2.7
-
-        `extensions`
-            List of Jinja extensions to use.  This can either be import paths
-            as strings or extension classes.  For more information have a
-            look at :ref:`the extensions documentation <jinja-extensions>`.
-
-        `optimized`
-            should the optimizer be enabled?  Default is ``True``.
-
-        `undefined`
-            :class:`Undefined` or a subclass of it that is used to represent
-            undefined values in the template.
-
-        `finalize`
-            A callable that can be used to process the result of a variable
-            expression before it is output.  For example one can convert
-            ``None`` implicitly into an empty string here.
-
-        `autoescape`
-            If set to ``True`` the XML/HTML autoescaping feature is enabled by
-            default.  For more details about autoescaping see
-            :class:`~markupsafe.Markup`.  As of Jinja 2.4 this can also
-            be a callable that is passed the template name and has to
-            return ``True`` or ``False`` depending on autoescape should be
-            enabled by default.
-
-            .. versionchanged:: 2.4
-               `autoescape` can now be a function
-
-        `loader`
-            The template loader for this environment.
-
-        `cache_size`
-            The size of the cache.  Per default this is ``400`` which means
-            that if more than 400 templates are loaded the loader will clean
-            out the least recently used template.  If the cache size is set to
-            ``0`` templates are recompiled all the time, if the cache size is
-            ``-1`` the cache will not be cleaned.
-
-            .. versionchanged:: 2.8
-               The cache size was increased to 400 from a low 50.
-
-        `auto_reload`
-            Some loaders load templates from locations where the template
-            sources may change (ie: file system or database).  If
-            ``auto_reload`` is set to ``True`` (default) every time a template is
-            requested the loader checks if the source changed and if yes, it
-            will reload the template.  For higher performance it's possible to
-            disable that.
-
-        `bytecode_cache`
-            If set to a bytecode cache object, this object will provide a
-            cache for the internal Jinja bytecode so that templates don't
-            have to be parsed if they were not changed.
-
-            See :ref:`bytecode-cache` for more information.
-
-        `enable_async`
-            If set to true this enables async template execution which
-            allows using async functions and generators.
-    """
-
-    #: if this environment is sandboxed.  Modifying this variable won't make
-    #: the environment sandboxed though.  For a real sandboxed environment
-    #: have a look at jinja2.sandbox.  This flag alone controls the code
-    #: generation by the compiler.
-    sandboxed = False
-
-    #: True if the environment is just an overlay
-    overlayed = False
-
-    #: the environment this environment is linked to if it is an overlay
-    linked_to = None
-
-    #: shared environments have this set to `True`.  A shared environment
-    #: must not be modified
-    shared = False
-
-    #: the class that is used for code generation.  See
-    #: :class:`~jinja2.compiler.CodeGenerator` for more information.
-    code_generator_class = CodeGenerator
-
-    #: the context class thatis used for templates.  See
-    #: :class:`~jinja2.runtime.Context` for more information.
-    context_class = Context
-
-    def __init__(
-        self,
-        block_start_string=BLOCK_START_STRING,
-        block_end_string=BLOCK_END_STRING,
-        variable_start_string=VARIABLE_START_STRING,
-        variable_end_string=VARIABLE_END_STRING,
-        comment_start_string=COMMENT_START_STRING,
-        comment_end_string=COMMENT_END_STRING,
-        line_statement_prefix=LINE_STATEMENT_PREFIX,
-        line_comment_prefix=LINE_COMMENT_PREFIX,
-        trim_blocks=TRIM_BLOCKS,
-        lstrip_blocks=LSTRIP_BLOCKS,
-        newline_sequence=NEWLINE_SEQUENCE,
-        keep_trailing_newline=KEEP_TRAILING_NEWLINE,
-        extensions=(),
-        optimized=True,
-        undefined=Undefined,
-        finalize=None,
-        autoescape=False,
-        loader=None,
-        cache_size=400,
-        auto_reload=True,
-        bytecode_cache=None,
-        enable_async=False,
-    ):
-        # !!Important notice!!
-        #   The constructor accepts quite a few arguments that should be
-        #   passed by keyword rather than position.  However it's important to
-        #   not change the order of arguments because it's used at least
-        #   internally in those cases:
-        #       -   spontaneous environments (i18n extension and Template)
-        #       -   unittests
-        #   If parameter changes are required only add parameters at the end
-        #   and don't change the arguments (or the defaults!) of the arguments
-        #   existing already.
-
-        # lexer / parser information
-        self.block_start_string = block_start_string
-        self.block_end_string = block_end_string
-        self.variable_start_string = variable_start_string
-        self.variable_end_string = variable_end_string
-        self.comment_start_string = comment_start_string
-        self.comment_end_string = comment_end_string
-        self.line_statement_prefix = line_statement_prefix
-        self.line_comment_prefix = line_comment_prefix
-        self.trim_blocks = trim_blocks
-        self.lstrip_blocks = lstrip_blocks
-        self.newline_sequence = newline_sequence
-        self.keep_trailing_newline = keep_trailing_newline
-
-        # runtime information
-        self.undefined = undefined
-        self.optimized = optimized
-        self.finalize = finalize
-        self.autoescape = autoescape
-
-        # defaults
-        self.filters = DEFAULT_FILTERS.copy()
-        self.tests = DEFAULT_TESTS.copy()
-        self.globals = DEFAULT_NAMESPACE.copy()
-
-        # set the loader provided
-        self.loader = loader
-        self.cache = create_cache(cache_size)
-        self.bytecode_cache = bytecode_cache
-        self.auto_reload = auto_reload
-
-        # configurable policies
-        self.policies = DEFAULT_POLICIES.copy()
-
-        # load extensions
-        self.extensions = load_extensions(self, extensions)
-
-        self.enable_async = enable_async
-        self.is_async = self.enable_async and have_async_gen
-        if self.is_async:
-            # runs patch_all() to enable async support
-            from . import asyncsupport  # noqa: F401
-
-        _environment_sanity_check(self)
-
-    def add_extension(self, extension):
-        """Adds an extension after the environment was created.
-
-        .. versionadded:: 2.5
-        """
-        self.extensions.update(load_extensions(self, [extension]))
-
-    def extend(self, **attributes):
-        """Add the items to the instance of the environment if they do not exist
-        yet.  This is used by :ref:`extensions <writing-extensions>` to register
-        callbacks and configuration values without breaking inheritance.
-        """
-        for key, value in attributes.items():
-            if not hasattr(self, key):
-                setattr(self, key, value)
-
-    def overlay(
-        self,
-        block_start_string=missing,
-        block_end_string=missing,
-        variable_start_string=missing,
-        variable_end_string=missing,
-        comment_start_string=missing,
-        comment_end_string=missing,
-        line_statement_prefix=missing,
-        line_comment_prefix=missing,
-        trim_blocks=missing,
-        lstrip_blocks=missing,
-        extensions=missing,
-        optimized=missing,
-        undefined=missing,
-        finalize=missing,
-        autoescape=missing,
-        loader=missing,
-        cache_size=missing,
-        auto_reload=missing,
-        bytecode_cache=missing,
-    ):
-        """Create a new overlay environment that shares all the data with the
-        current environment except for cache and the overridden attributes.
-        Extensions cannot be removed for an overlayed environment.  An overlayed
-        environment automatically gets all the extensions of the environment it
-        is linked to plus optional extra extensions.
-
-        Creating overlays should happen after the initial environment was set
-        up completely.  Not all attributes are truly linked, some are just
-        copied over so modifications on the original environment may not shine
-        through.
-        """
-        args = dict(locals())
-        del args["self"], args["cache_size"], args["extensions"]
-
-        rv = object.__new__(self.__class__)
-        rv.__dict__.update(self.__dict__)
-        rv.overlayed = True
-        rv.linked_to = self
-
-        for key, value in args.items():
-            if value is not missing:
-                setattr(rv, key, value)
-
-        if cache_size is not missing:
-            rv.cache = create_cache(cache_size)
-        else:
-            rv.cache = copy_cache(self.cache)
-
-        rv.extensions = {}
-        for key, value in self.extensions.items():
-            rv.extensions[key] = value.bind(rv)
-        if extensions is not missing:
-            rv.extensions.update(load_extensions(rv, extensions))
-
-        return _environment_sanity_check(rv)
-
-    lexer = property(get_lexer, doc="The lexer for this environment.")
-
-    def iter_extensions(self):
-        """Iterates over the extensions by priority."""
-        return iter(sorted(self.extensions.values(), key=lambda x: x.priority))
-
-    def getitem(self, obj, argument):
-        """Get an item or attribute of an object but prefer the item."""
-        try:
-            return obj[argument]
-        except (AttributeError, TypeError, LookupError):
-            if isinstance(argument, str):
-                try:
-                    attr = str(argument)
-                except Exception:
-                    pass
-                else:
-                    try:
-                        return getattr(obj, attr)
-                    except AttributeError:
-                        pass
-            return self.undefined(obj=obj, name=argument)
-
-    def getattr(self, obj, attribute):
-        """Get an item or attribute of an object but prefer the attribute.
-        Unlike :meth:`getitem` the attribute *must* be a bytestring.
-        """
-        try:
-            return getattr(obj, attribute)
-        except AttributeError:
-            pass
-        try:
-            return obj[attribute]
-        except (TypeError, LookupError, AttributeError):
-            return self.undefined(obj=obj, name=attribute)
-
-    def call_filter(
-        self, name, value, args=None, kwargs=None, context=None, eval_ctx=None
-    ):
-        """Invokes a filter on a value the same way the compiler does.
-
-        This might return a coroutine if the filter is running from an
-        environment in async mode and the filter supports async
-        execution. It's your responsibility to await this if needed.
-
-        .. versionadded:: 2.7
-        """
-        func = self.filters.get(name)
-        if func is None:
-            fail_for_missing_callable("filter", name)
-        args = [value] + list(args or ())
-        if getattr(func, "contextfilter", False) is True:
-            if context is None:
-                raise TemplateRuntimeError(
-                    "Attempted to invoke context filter without context"
-                )
-            args.insert(0, context)
-        elif getattr(func, "evalcontextfilter", False) is True:
-            if eval_ctx is None:
-                if context is not None:
-                    eval_ctx = context.eval_ctx
-                else:
-                    eval_ctx = EvalContext(self)
-            args.insert(0, eval_ctx)
-        elif getattr(func, "environmentfilter", False) is True:
-            args.insert(0, self)
-        return func(*args, **(kwargs or {}))
-
-    def call_test(self, name, value, args=None, kwargs=None):
-        """Invokes a test on a value the same way the compiler does it.
-
-        .. versionadded:: 2.7
-        """
-        func = self.tests.get(name)
-        if func is None:
-            fail_for_missing_callable("test", name)
-        return func(value, *(args or ()), **(kwargs or {}))
-
-    @internalcode
-    def parse(self, source, name=None, filename=None):
-        """Parse the sourcecode and return the abstract syntax tree.  This
-        tree of nodes is used by the compiler to convert the template into
-        executable source- or bytecode.  This is useful for debugging or to
-        extract information from templates.
-
-        If you are :ref:`developing Jinja extensions <writing-extensions>`
-        this gives you a good overview of the node tree generated.
-        """
-        try:
-            return self._parse(source, name, filename)
-        except TemplateSyntaxError:
-            self.handle_exception(source=source)
-
-    def _parse(self, source, name, filename):
-        """Internal parsing function used by `parse` and `compile`."""
-        return Parser(self, source, name, filename).parse()
-
-    def lex(self, source, name=None, filename=None):
-        """Lex the given sourcecode and return a generator that yields
-        tokens as tuples in the form ``(lineno, token_type, value)``.
-        This can be useful for :ref:`extension development <writing-extensions>`
-        and debugging templates.
-
-        This does not perform preprocessing.  If you want the preprocessing
-        of the extensions to be applied you have to filter source through
-        the :meth:`preprocess` method.
-        """
-        source = str(source)
-        try:
-            return self.lexer.tokeniter(source, name, filename)
-        except TemplateSyntaxError:
-            self.handle_exception(source=source)
-
-    def preprocess(self, source, name=None, filename=None):
-        """Preprocesses the source with all extensions.  This is automatically
-        called for all parsing and compiling methods but *not* for :meth:`lex`
-        because there you usually only want the actual source tokenized.
-        """
-        return reduce(
-            lambda s, e: e.preprocess(s, name, filename),
-            self.iter_extensions(),
-            str(source),
-        )
-
-    def _tokenize(self, source, name, filename=None, state=None):
-        """Called by the parser to do the preprocessing and filtering
-        for all the extensions.  Returns a :class:`~jinja2.lexer.TokenStream`.
-        """
-        source = self.preprocess(source, name, filename)
-        stream = self.lexer.tokenize(source, name, filename, state)
-        for ext in self.iter_extensions():
-            stream = ext.filter_stream(stream)
-            if not isinstance(stream, TokenStream):
-                stream = TokenStream(stream, name, filename)
-        return stream
-
-    def _generate(self, source, name, filename, defer_init=False):
-        """Internal hook that can be overridden to hook a different generate
-        method in.
-
-        .. versionadded:: 2.5
-        """
-        return generate(
-            source,
-            self,
-            name,
-            filename,
-            defer_init=defer_init,
-            optimized=self.optimized,
-        )
-
-    def _compile(self, source, filename):
-        """Internal hook that can be overridden to hook a different compile
-        method in.
-
-        .. versionadded:: 2.5
-        """
-        return compile(source, filename, "exec")
-
-    @internalcode
-    def compile(self, source, name=None, filename=None, raw=False, defer_init=False):
-        """Compile a node or template source code.  The `name` parameter is
-        the load name of the template after it was joined using
-        :meth:`join_path` if necessary, not the filename on the file system.
-        the `filename` parameter is the estimated filename of the template on
-        the file system.  If the template came from a database or memory this
-        can be omitted.
-
-        The return value of this method is a python code object.  If the `raw`
-        parameter is `True` the return value will be a string with python
-        code equivalent to the bytecode returned otherwise.  This method is
-        mainly used internally.
-
-        `defer_init` is use internally to aid the module code generator.  This
-        causes the generated code to be able to import without the global
-        environment variable to be set.
-
-        .. versionadded:: 2.4
-           `defer_init` parameter added.
-        """
-        source_hint = None
-        try:
-            if isinstance(source, str):
-                source_hint = source
-                source = self._parse(source, name, filename)
-            source = self._generate(source, name, filename, defer_init=defer_init)
-            if raw:
-                return source
-            if filename is None:
-                filename = "<template>"
-            return self._compile(source, filename)
-        except TemplateSyntaxError:
-            self.handle_exception(source=source_hint)
-
-    def compile_expression(self, source, undefined_to_none=True):
-        """A handy helper method that returns a callable that accepts keyword
-        arguments that appear as variables in the expression.  If called it
-        returns the result of the expression.
-
-        This is useful if applications want to use the same rules as Jinja
-        in template "configuration files" or similar situations.
-
-        Example usage:
-
-        >>> env = Environment()
-        >>> expr = env.compile_expression('foo == 42')
-        >>> expr(foo=23)
-        False
-        >>> expr(foo=42)
-        True
-
-        Per default the return value is converted to `None` if the
-        expression returns an undefined value.  This can be changed
-        by setting `undefined_to_none` to `False`.
-
-        >>> env.compile_expression('var')() is None
-        True
-        >>> env.compile_expression('var', undefined_to_none=False)()
-        Undefined
-
-        .. versionadded:: 2.1
-        """
-        parser = Parser(self, source, state="variable")
-        try:
-            expr = parser.parse_expression()
-            if not parser.stream.eos:
-                raise TemplateSyntaxError(
-                    "chunk after expression", parser.stream.current.lineno, None, None
-                )
-            expr.set_environment(self)
-        except TemplateSyntaxError:
-            if sys.exc_info() is not None:
-                self.handle_exception(source=source)
-
-        body = [nodes.Assign(nodes.Name("result", "store"), expr, lineno=1)]
-        template = self.from_string(nodes.Template(body, lineno=1))
-        return TemplateExpression(template, undefined_to_none)
-
-    def compile_templates(
-        self,
-        target,
-        extensions=None,
-        filter_func=None,
-        zip="deflated",
-        log_function=None,
-        ignore_errors=True,
-    ):
-        """Finds all the templates the loader can find, compiles them
-        and stores them in `target`.  If `zip` is `None`, instead of in a
-        zipfile, the templates will be stored in a directory.
-        By default a deflate zip algorithm is used. To switch to
-        the stored algorithm, `zip` can be set to ``'stored'``.
-
-        `extensions` and `filter_func` are passed to :meth:`list_templates`.
-        Each template returned will be compiled to the target folder or
-        zipfile.
-
-        By default template compilation errors are ignored.  In case a
-        log function is provided, errors are logged.  If you want template
-        syntax errors to abort the compilation you can set `ignore_errors`
-        to `False` and you will get an exception on syntax errors.
-
-        .. versionadded:: 2.4
-        """
-        from .loaders import ModuleLoader
-
-        if log_function is None:
-
-            def log_function(x):
-                pass
-
-        def write_file(filename, data):
-            if zip:
-                info = ZipInfo(filename)
-                info.external_attr = 0o755 << 16
-                zip_file.writestr(info, data)
-            else:
-                if isinstance(data, str):
-                    data = data.encode("utf8")
-
-                with open(os.path.join(target, filename), "wb") as f:
-                    f.write(data)
-
-        if zip is not None:
-            from zipfile import ZipFile, ZipInfo, ZIP_DEFLATED, ZIP_STORED
-
-            zip_file = ZipFile(
-                target, "w", dict(deflated=ZIP_DEFLATED, stored=ZIP_STORED)[zip]
-            )
-            log_function(f"Compiling into Zip archive {target!r}")
-        else:
-            if not os.path.isdir(target):
-                os.makedirs(target)
-            log_function(f"Compiling into folder {target!r}")
-
-        try:
-            for name in self.list_templates(extensions, filter_func):
-                source, filename, _ = self.loader.get_source(self, name)
-                try:
-                    code = self.compile(source, name, filename, True, True)
-                except TemplateSyntaxError as e:
-                    if not ignore_errors:
-                        raise
-                    log_function(f'Could not compile "{name}": {e}')
-                    continue
-
-                filename = ModuleLoader.get_module_filename(name)
-
-                write_file(filename, code)
-                log_function(f'Compiled "{name}" as {filename}')
-        finally:
-            if zip:
-                zip_file.close()
-
-        log_function("Finished compiling templates")
-
-    def list_templates(self, extensions=None, filter_func=None):
-        """Returns a list of templates for this environment.  This requires
-        that the loader supports the loader's
-        :meth:`~BaseLoader.list_templates` method.
-
-        If there are other files in the template folder besides the
-        actual templates, the returned list can be filtered.  There are two
-        ways: either `extensions` is set to a list of file extensions for
-        templates, or a `filter_func` can be provided which is a callable that
-        is passed a template name and should return `True` if it should end up
-        in the result list.
-
-        If the loader does not support that, a :exc:`TypeError` is raised.
-
-        .. versionadded:: 2.4
-        """
-        names = self.loader.list_templates()
-
-        if extensions is not None:
-            if filter_func is not None:
-                raise TypeError(
-                    "either extensions or filter_func can be passed, but not both"
-                )
-
-            def filter_func(x):
-                return "." in x and x.rsplit(".", 1)[1] in extensions
-
-        if filter_func is not None:
-            names = [name for name in names if filter_func(name)]
-
-        return names
-
-    def handle_exception(self, source=None):
-        """Exception handling helper.  This is used internally to either raise
-        rewritten exceptions or return a rendered traceback for the template.
-        """
-        from .debug import rewrite_traceback_stack
-
-        raise rewrite_traceback_stack(source=source)
-
-    def join_path(self, template, parent):
-        """Join a template with the parent.  By default all the lookups are
-        relative to the loader root so this method returns the `template`
-        parameter unchanged, but if the paths should be relative to the
-        parent template, this function can be used to calculate the real
-        template name.
-
-        Subclasses may override this method and implement template path
-        joining here.
-        """
-        return template
-
-    @internalcode
-    def _load_template(self, name, globals):
-        if self.loader is None:
-            raise TypeError("no loader for this environment specified")
-        cache_key = (weakref.ref(self.loader), name)
-        if self.cache is not None:
-            template = self.cache.get(cache_key)
-            if template is not None and (
-                not self.auto_reload or template.is_up_to_date
-            ):
-                return template
-        template = self.loader.load(self, name, globals)
-        if self.cache is not None:
-            self.cache[cache_key] = template
-        return template
-
-    @internalcode
-    def get_template(self, name, parent=None, globals=None):
-        """Load a template from the loader.  If a loader is configured this
-        method asks the loader for the template and returns a :class:`Template`.
-        If the `parent` parameter is not `None`, :meth:`join_path` is called
-        to get the real template name before loading.
-
-        The `globals` parameter can be used to provide template wide globals.
-        These variables are available in the context at render time.
-
-        If the template does not exist a :exc:`TemplateNotFound` exception is
-        raised.
-
-        .. versionchanged:: 2.4
-           If `name` is a :class:`Template` object it is returned from the
-           function unchanged.
-        """
-        if isinstance(name, Template):
-            return name
-        if parent is not None:
-            name = self.join_path(name, parent)
-        return self._load_template(name, self.make_globals(globals))
-
-    @internalcode
-    def select_template(self, names, parent=None, globals=None):
-        """Works like :meth:`get_template` but tries a number of templates
-        before it fails.  If it cannot find any of the templates, it will
-        raise a :exc:`TemplatesNotFound` exception.
-
-        .. versionchanged:: 2.11
-            If names is :class:`Undefined`, an :exc:`UndefinedError` is
-            raised instead. If no templates were found and names
-            contains :class:`Undefined`, the message is more helpful.
-
-        .. versionchanged:: 2.4
-           If `names` contains a :class:`Template` object it is returned
-           from the function unchanged.
-
-        .. versionadded:: 2.3
-        """
-        if isinstance(names, Undefined):
-            names._fail_with_undefined_error()
-
-        if not names:
-            raise TemplatesNotFound(
-                message="Tried to select from an empty list of templates."
-            )
-        globals = self.make_globals(globals)
-        for name in names:
-            if isinstance(name, Template):
-                return name
-            if parent is not None:
-                name = self.join_path(name, parent)
-            try:
-                return self._load_template(name, globals)
-            except (TemplateNotFound, UndefinedError):
-                pass
-        raise TemplatesNotFound(names)
-
-    @internalcode
-    def get_or_select_template(self, template_name_or_list, parent=None, globals=None):
-        """Does a typecheck and dispatches to :meth:`select_template`
-        if an iterable of template names is given, otherwise to
-        :meth:`get_template`.
-
-        .. versionadded:: 2.3
-        """
-        if isinstance(template_name_or_list, (str, Undefined)):
-            return self.get_template(template_name_or_list, parent, globals)
-        elif isinstance(template_name_or_list, Template):
-            return template_name_or_list
-        return self.select_template(template_name_or_list, parent, globals)
-
-    def from_string(self, source, globals=None, template_class=None):
-        """Load a template from a string.  This parses the source given and
-        returns a :class:`Template` object.
-        """
-        globals = self.make_globals(globals)
-        cls = template_class or self.template_class
-        return cls.from_code(self, self.compile(source), globals, None)
-
-    def make_globals(self, d):
-        """Return a dict for the globals."""
-        if not d:
-            return self.globals
-        return dict(self.globals, **d)
-
-
-class Template:
-    """The central template object.  This class represents a compiled template
-    and is used to evaluate it.
-
-    Normally the template object is generated from an :class:`Environment` but
-    it also has a constructor that makes it possible to create a template
-    instance directly using the constructor.  It takes the same arguments as
-    the environment constructor but it's not possible to specify a loader.
-
-    Every template object has a few methods and members that are guaranteed
-    to exist.  However it's important that a template object should be
-    considered immutable.  Modifications on the object are not supported.
-
-    Template objects created from the constructor rather than an environment
-    do have an `environment` attribute that points to a temporary environment
-    that is probably shared with other templates created with the constructor
-    and compatible settings.
-
-    >>> template = Template('Hello {{ name }}!')
-    >>> template.render(name='John Doe') == u'Hello John Doe!'
-    True
-    >>> stream = template.stream(name='John Doe')
-    >>> next(stream) == u'Hello John Doe!'
-    True
-    >>> next(stream)
-    Traceback (most recent call last):
-        ...
-    StopIteration
-    """
-
-    #: Type of environment to create when creating a template directly
-    #: rather than through an existing environment.
-    environment_class = Environment
-
-    def __new__(
-        cls,
-        source,
-        block_start_string=BLOCK_START_STRING,
-        block_end_string=BLOCK_END_STRING,
-        variable_start_string=VARIABLE_START_STRING,
-        variable_end_string=VARIABLE_END_STRING,
-        comment_start_string=COMMENT_START_STRING,
-        comment_end_string=COMMENT_END_STRING,
-        line_statement_prefix=LINE_STATEMENT_PREFIX,
-        line_comment_prefix=LINE_COMMENT_PREFIX,
-        trim_blocks=TRIM_BLOCKS,
-        lstrip_blocks=LSTRIP_BLOCKS,
-        newline_sequence=NEWLINE_SEQUENCE,
-        keep_trailing_newline=KEEP_TRAILING_NEWLINE,
-        extensions=(),
-        optimized=True,
-        undefined=Undefined,
-        finalize=None,
-        autoescape=False,
-        enable_async=False,
-    ):
-        env = get_spontaneous_environment(
-            cls.environment_class,
-            block_start_string,
-            block_end_string,
-            variable_start_string,
-            variable_end_string,
-            comment_start_string,
-            comment_end_string,
-            line_statement_prefix,
-            line_comment_prefix,
-            trim_blocks,
-            lstrip_blocks,
-            newline_sequence,
-            keep_trailing_newline,
-            frozenset(extensions),
-            optimized,
-            undefined,
-            finalize,
-            autoescape,
-            None,
-            0,
-            False,
-            None,
-            enable_async,
-        )
-        return env.from_string(source, template_class=cls)
-
-    @classmethod
-    def from_code(cls, environment, code, globals, uptodate=None):
-        """Creates a template object from compiled code and the globals.  This
-        is used by the loaders and environment to create a template object.
-        """
-        namespace = {"environment": environment, "__file__": code.co_filename}
-        exec(code, namespace)
-        rv = cls._from_namespace(environment, namespace, globals)
-        rv._uptodate = uptodate
-        return rv
-
-    @classmethod
-    def from_module_dict(cls, environment, module_dict, globals):
-        """Creates a template object from a module.  This is used by the
-        module loader to create a template object.
-
-        .. versionadded:: 2.4
-        """
-        return cls._from_namespace(environment, module_dict, globals)
-
-    @classmethod
-    def _from_namespace(cls, environment, namespace, globals):
-        t = object.__new__(cls)
-        t.environment = environment
-        t.globals = globals
-        t.name = namespace["name"]
-        t.filename = namespace["__file__"]
-        t.blocks = namespace["blocks"]
-
-        # render function and module
-        t.root_render_func = namespace["root"]
-        t._module = None
-
-        # debug and loader helpers
-        t._debug_info = namespace["debug_info"]
-        t._uptodate = None
-
-        # store the reference
-        namespace["environment"] = environment
-        namespace["__jinja_template__"] = t
-
-        return t
-
-    def render(self, *args, **kwargs):
-        """This method accepts the same arguments as the `dict` constructor:
-        A dict, a dict subclass or some keyword arguments.  If no arguments
-        are given the context will be empty.  These two calls do the same::
-
-            template.render(knights='that say nih')
-            template.render({'knights': 'that say nih'})
-
-        This will return the rendered template as a string.
-        """
-        vars = dict(*args, **kwargs)
-        try:
-            return concat(self.root_render_func(self.new_context(vars)))
-        except Exception:
-            self.environment.handle_exception()
-
-    def render_async(self, *args, **kwargs):
-        """This works similar to :meth:`render` but returns a coroutine
-        that when awaited returns the entire rendered template string.  This
-        requires the async feature to be enabled.
-
-        Example usage::
-
-            await template.render_async(knights='that say nih; asynchronously')
-        """
-        # see asyncsupport for the actual implementation
-        raise NotImplementedError(
-            "This feature is not available for this version of Python"
-        )
-
-    def stream(self, *args, **kwargs):
-        """Works exactly like :meth:`generate` but returns a
-        :class:`TemplateStream`.
-        """
-        return TemplateStream(self.generate(*args, **kwargs))
-
-    def generate(self, *args, **kwargs):
-        """For very large templates it can be useful to not render the whole
-        template at once but evaluate each statement after another and yield
-        piece for piece.  This method basically does exactly that and returns
-        a generator that yields one item after another as strings.
-
-        It accepts the same arguments as :meth:`render`.
-        """
-        vars = dict(*args, **kwargs)
-        try:
-            yield from self.root_render_func(self.new_context(vars))
-        except Exception:
-            yield self.environment.handle_exception()
-
-    def generate_async(self, *args, **kwargs):
-        """An async version of :meth:`generate`.  Works very similarly but
-        returns an async iterator instead.
-        """
-        # see asyncsupport for the actual implementation
-        raise NotImplementedError(
-            "This feature is not available for this version of Python"
-        )
-
-    def new_context(self, vars=None, shared=False, locals=None):
-        """Create a new :class:`Context` for this template.  The vars
-        provided will be passed to the template.  Per default the globals
-        are added to the context.  If shared is set to `True` the data
-        is passed as is to the context without adding the globals.
-
-        `locals` can be a dict of local variables for internal usage.
-        """
-        return new_context(
-            self.environment, self.name, self.blocks, vars, shared, self.globals, locals
-        )
-
-    def make_module(self, vars=None, shared=False, locals=None):
-        """This method works like the :attr:`module` attribute when called
-        without arguments but it will evaluate the template on every call
-        rather than caching it.  It's also possible to provide
-        a dict which is then used as context.  The arguments are the same
-        as for the :meth:`new_context` method.
-        """
-        return TemplateModule(self, self.new_context(vars, shared, locals))
-
-    def make_module_async(self, vars=None, shared=False, locals=None):
-        """As template module creation can invoke template code for
-        asynchronous executions this method must be used instead of the
-        normal :meth:`make_module` one.  Likewise the module attribute
-        becomes unavailable in async mode.
-        """
-        # see asyncsupport for the actual implementation
-        raise NotImplementedError(
-            "This feature is not available for this version of Python"
-        )
-
-    @internalcode
-    def _get_default_module(self, ctx=None):
-        """If a context is passed in, this means that the template was
-        imported.  Imported templates have access to the current template's
-        globals by default, but they can only be accessed via the context
-        during runtime.
-
-        If there are new globals, we need to create a new
-        module because the cached module is already rendered and will not have
-        access to globals from the current context.  This new module is not
-        cached as :attr:`_module` because the template can be imported elsewhere,
-        and it should have access to only the current template's globals.
-        """
-        if ctx is not None:
-            globals = {
-                key: ctx.parent[key] for key in ctx.globals_keys - self.globals.keys()
-            }
-            if globals:
-                return self.make_module(globals)
-        if self._module is not None:
-            return self._module
-        self._module = rv = self.make_module()
-        return rv
-
-    @property
-    def module(self):
-        """The template as module.  This is used for imports in the
-        template runtime but is also useful if one wants to access
-        exported template variables from the Python layer:
-
-        >>> t = Template('{% macro foo() %}42{% endmacro %}23')
-        >>> str(t.module)
-        '23'
-        >>> t.module.foo() == u'42'
-        True
-
-        This attribute is not available if async mode is enabled.
-        """
-        return self._get_default_module()
-
-    def get_corresponding_lineno(self, lineno):
-        """Return the source line number of a line number in the
-        generated bytecode as they are not in sync.
-        """
-        for template_line, code_line in reversed(self.debug_info):
-            if code_line <= lineno:
-                return template_line
-        return 1
-
-    @property
-    def is_up_to_date(self):
-        """If this variable is `False` there is a newer version available."""
-        if self._uptodate is None:
-            return True
-        return self._uptodate()
-
-    @property
-    def debug_info(self):
-        """The debug info mapping."""
-        if self._debug_info:
-            return [tuple(map(int, x.split("="))) for x in self._debug_info.split("&")]
-        return []
-
-    def __repr__(self):
-        if self.name is None:
-            name = f"memory:{id(self):x}"
-        else:
-            name = repr(self.name)
-        return f"<{self.__class__.__name__} {name}>"
-
-
-class TemplateModule:
-    """Represents an imported template.  All the exported names of the
-    template are available as attributes on this object.  Additionally
-    converting it into a string renders the contents.
-    """
-
-    def __init__(self, template, context, body_stream=None):
-        if body_stream is None:
-            if context.environment.is_async:
-                raise RuntimeError(
-                    "Async mode requires a body stream "
-                    "to be passed to a template module.  Use "
-                    "the async methods of the API you are "
-                    "using."
-                )
-            body_stream = list(template.root_render_func(context))
-        self._body_stream = body_stream
-        self.__dict__.update(context.get_exported())
-        self.__name__ = template.name
-
-    def __html__(self):
-        return Markup(concat(self._body_stream))
-
-    def __str__(self):
-        return concat(self._body_stream)
-
-    def __repr__(self):
-        if self.__name__ is None:
-            name = f"memory:{id(self):x}"
-        else:
-            name = repr(self.__name__)
-        return f"<{self.__class__.__name__} {name}>"
-
-
-class TemplateExpression:
-    """The :meth:`jinja2.Environment.compile_expression` method returns an
-    instance of this object.  It encapsulates the expression-like access
-    to the template with an expression it wraps.
-    """
-
-    def __init__(self, template, undefined_to_none):
-        self._template = template
-        self._undefined_to_none = undefined_to_none
-
-    def __call__(self, *args, **kwargs):
-        context = self._template.new_context(dict(*args, **kwargs))
-        consume(self._template.root_render_func(context))
-        rv = context.vars["result"]
-        if self._undefined_to_none and isinstance(rv, Undefined):
-            rv = None
-        return rv
-
-
-class TemplateStream:
-    """A template stream works pretty much like an ordinary python generator
-    but it can buffer multiple items to reduce the number of total iterations.
-    Per default the output is unbuffered which means that for every unbuffered
-    instruction in the template one string is yielded.
-
-    If buffering is enabled with a buffer size of 5, five items are combined
-    into a new string.  This is mainly useful if you are streaming
-    big templates to a client via WSGI which flushes after each iteration.
-    """
-
-    def __init__(self, gen):
-        self._gen = gen
-        self.disable_buffering()
-
-    def dump(self, fp, encoding=None, errors="strict"):
-        """Dump the complete stream into a file or file-like object.
-        Per default strings are written, if you want to encode
-        before writing specify an `encoding`.
-
-        Example usage::
-
-            Template('Hello {{ name }}!').stream(name='foo').dump('hello.html')
-        """
-        close = False
-        if isinstance(fp, str):
-            if encoding is None:
-                encoding = "utf-8"
-            fp = open(fp, "wb")
-            close = True
-        try:
-            if encoding is not None:
-                iterable = (x.encode(encoding, errors) for x in self)
-            else:
-                iterable = self
-            if hasattr(fp, "writelines"):
-                fp.writelines(iterable)
-            else:
-                for item in iterable:
-                    fp.write(item)
-        finally:
-            if close:
-                fp.close()
-
-    def disable_buffering(self):
-        """Disable the output buffering."""
-        self._next = partial(next, self._gen)
-        self.buffered = False
-
-    def _buffered_generator(self, size):
-        buf = []
-        c_size = 0
-        push = buf.append
-
-        while 1:
-            try:
-                while c_size < size:
-                    c = next(self._gen)
-                    push(c)
-                    if c:
-                        c_size += 1
-            except StopIteration:
-                if not c_size:
-                    return
-            yield concat(buf)
-            del buf[:]
-            c_size = 0
-
-    def enable_buffering(self, size=5):
-        """Enable buffering.  Buffer `size` items before yielding them."""
-        if size <= 1:
-            raise ValueError("buffer size too small")
-
-        self.buffered = True
-        self._next = partial(next, self._buffered_generator(size))
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        return self._next()
-
-
-# hook in default template class.  if anyone reads this comment: ignore that
-# it's possible to use custom templates ;-)
-Environment.template_class = Template
diff --git a/src/jinja2/exceptions.py b/src/jinja2/exceptions.py
deleted file mode 100644
index 07cfba26..00000000
--- a/src/jinja2/exceptions.py
+++ /dev/null
@@ -1,147 +0,0 @@
-class TemplateError(Exception):
-    """Baseclass for all template errors."""
-
-    def __init__(self, message=None):
-        super().__init__(message)
-
-    @property
-    def message(self):
-        if self.args:
-            return self.args[0]
-
-
-class TemplateNotFound(IOError, LookupError, TemplateError):
-    """Raised if a template does not exist.
-
-    .. versionchanged:: 2.11
-        If the given name is :class:`Undefined` and no message was
-        provided, an :exc:`UndefinedError` is raised.
-    """
-
-    # Silence the Python warning about message being deprecated since
-    # it's not valid here.
-    message = None
-
-    def __init__(self, name, message=None):
-        IOError.__init__(self, name)
-
-        if message is None:
-            from .runtime import Undefined
-
-            if isinstance(name, Undefined):
-                name._fail_with_undefined_error()
-
-            message = name
-
-        self.message = message
-        self.name = name
-        self.templates = [name]
-
-    def __str__(self):
-        return self.message
-
-
-class TemplatesNotFound(TemplateNotFound):
-    """Like :class:`TemplateNotFound` but raised if multiple templates
-    are selected.  This is a subclass of :class:`TemplateNotFound`
-    exception, so just catching the base exception will catch both.
-
-    .. versionchanged:: 2.11
-        If a name in the list of names is :class:`Undefined`, a message
-        about it being undefined is shown rather than the empty string.
-
-    .. versionadded:: 2.2
-    """
-
-    def __init__(self, names=(), message=None):
-        if message is None:
-            from .runtime import Undefined
-
-            parts = []
-
-            for name in names:
-                if isinstance(name, Undefined):
-                    parts.append(name._undefined_message)
-                else:
-                    parts.append(name)
-
-            message = "none of the templates given were found: " + ", ".join(
-                map(str, parts)
-            )
-        TemplateNotFound.__init__(self, names[-1] if names else None, message)
-        self.templates = list(names)
-
-
-class TemplateSyntaxError(TemplateError):
-    """Raised to tell the user that there is a problem with the template."""
-
-    def __init__(self, message, lineno, name=None, filename=None):
-        TemplateError.__init__(self, message)
-        self.lineno = lineno
-        self.name = name
-        self.filename = filename
-        self.source = None
-
-        # this is set to True if the debug.translate_syntax_error
-        # function translated the syntax error into a new traceback
-        self.translated = False
-
-    def __str__(self):
-        # for translated errors we only return the message
-        if self.translated:
-            return self.message
-
-        # otherwise attach some stuff
-        location = f"line {self.lineno}"
-        name = self.filename or self.name
-        if name:
-            location = f'File "{name}", {location}'
-        lines = [self.message, "  " + location]
-
-        # if the source is set, add the line to the output
-        if self.source is not None:
-            try:
-                line = self.source.splitlines()[self.lineno - 1]
-            except IndexError:
-                line = None
-            if line:
-                lines.append("    " + line.strip())
-
-        return "\n".join(lines)
-
-    def __reduce__(self):
-        # https://bugs.python.org/issue1692335 Exceptions that take
-        # multiple required arguments have problems with pickling.
-        # Without this, raises TypeError: __init__() missing 1 required
-        # positional argument: 'lineno'
-        return self.__class__, (self.message, self.lineno, self.name, self.filename)
-
-
-class TemplateAssertionError(TemplateSyntaxError):
-    """Like a template syntax error, but covers cases where something in the
-    template caused an error at compile time that wasn't necessarily caused
-    by a syntax error.  However it's a direct subclass of
-    :exc:`TemplateSyntaxError` and has the same attributes.
-    """
-
-
-class TemplateRuntimeError(TemplateError):
-    """A generic runtime error in the template engine.  Under some situations
-    Jinja may raise this exception.
-    """
-
-
-class UndefinedError(TemplateRuntimeError):
-    """Raised if a template tries to operate on :class:`Undefined`."""
-
-
-class SecurityError(TemplateRuntimeError):
-    """Raised if a template tries to do something insecure if the
-    sandbox is enabled.
-    """
-
-
-class FilterArgumentError(TemplateRuntimeError):
-    """This error is raised if a filter was called with inappropriate
-    arguments
-    """
diff --git a/src/jinja2/ext.py b/src/jinja2/ext.py
deleted file mode 100644
index 533ff179..00000000
--- a/src/jinja2/ext.py
+++ /dev/null
@@ -1,700 +0,0 @@
-"""Extension API for adding custom tags and behavior."""
-import pprint
-import re
-from sys import version_info
-
-from markupsafe import Markup
-
-from . import nodes
-from .defaults import BLOCK_END_STRING
-from .defaults import BLOCK_START_STRING
-from .defaults import COMMENT_END_STRING
-from .defaults import COMMENT_START_STRING
-from .defaults import KEEP_TRAILING_NEWLINE
-from .defaults import LINE_COMMENT_PREFIX
-from .defaults import LINE_STATEMENT_PREFIX
-from .defaults import LSTRIP_BLOCKS
-from .defaults import NEWLINE_SEQUENCE
-from .defaults import TRIM_BLOCKS
-from .defaults import VARIABLE_END_STRING
-from .defaults import VARIABLE_START_STRING
-from .environment import Environment
-from .exceptions import TemplateAssertionError
-from .exceptions import TemplateSyntaxError
-from .nodes import ContextReference
-from .runtime import concat
-from .utils import contextfunction
-from .utils import import_string
-
-# I18N functions available in Jinja templates. If the I18N library
-# provides ugettext, it will be assigned to gettext.
-GETTEXT_FUNCTIONS = ("_", "gettext", "ngettext")
-_ws_re = re.compile(r"\s*\n\s*")
-
-
-class ExtensionRegistry(type):
-    """Gives the extension an unique identifier."""
-
-    def __new__(mcs, name, bases, d):
-        rv = type.__new__(mcs, name, bases, d)
-        rv.identifier = f"{rv.__module__}.{rv.__name__}"
-        return rv
-
-
-class Extension(metaclass=ExtensionRegistry):
-    """Extensions can be used to add extra functionality to the Jinja template
-    system at the parser level.  Custom extensions are bound to an environment
-    but may not store environment specific data on `self`.  The reason for
-    this is that an extension can be bound to another environment (for
-    overlays) by creating a copy and reassigning the `environment` attribute.
-
-    As extensions are created by the environment they cannot accept any
-    arguments for configuration.  One may want to work around that by using
-    a factory function, but that is not possible as extensions are identified
-    by their import name.  The correct way to configure the extension is
-    storing the configuration values on the environment.  Because this way the
-    environment ends up acting as central configuration storage the
-    attributes may clash which is why extensions have to ensure that the names
-    they choose for configuration are not too generic.  ``prefix`` for example
-    is a terrible name, ``fragment_cache_prefix`` on the other hand is a good
-    name as includes the name of the extension (fragment cache).
-    """
-
-    #: if this extension parses this is the list of tags it's listening to.
-    tags = set()
-
-    #: the priority of that extension.  This is especially useful for
-    #: extensions that preprocess values.  A lower value means higher
-    #: priority.
-    #:
-    #: .. versionadded:: 2.4
-    priority = 100
-
-    def __init__(self, environment):
-        self.environment = environment
-
-    def bind(self, environment):
-        """Create a copy of this extension bound to another environment."""
-        rv = object.__new__(self.__class__)
-        rv.__dict__.update(self.__dict__)
-        rv.environment = environment
-        return rv
-
-    def preprocess(self, source, name, filename=None):
-        """This method is called before the actual lexing and can be used to
-        preprocess the source.  The `filename` is optional.  The return value
-        must be the preprocessed source.
-        """
-        return source
-
-    def filter_stream(self, stream):
-        """It's passed a :class:`~jinja2.lexer.TokenStream` that can be used
-        to filter tokens returned.  This method has to return an iterable of
-        :class:`~jinja2.lexer.Token`\\s, but it doesn't have to return a
-        :class:`~jinja2.lexer.TokenStream`.
-        """
-        return stream
-
-    def parse(self, parser):
-        """If any of the :attr:`tags` matched this method is called with the
-        parser as first argument.  The token the parser stream is pointing at
-        is the name token that matched.  This method has to return one or a
-        list of multiple nodes.
-        """
-        raise NotImplementedError()
-
-    def attr(self, name, lineno=None):
-        """Return an attribute node for the current extension.  This is useful
-        to pass constants on extensions to generated template code.
-
-        ::
-
-            self.attr('_my_attribute', lineno=lineno)
-        """
-        return nodes.ExtensionAttribute(self.identifier, name, lineno=lineno)
-
-    def call_method(
-        self, name, args=None, kwargs=None, dyn_args=None, dyn_kwargs=None, lineno=None
-    ):
-        """Call a method of the extension.  This is a shortcut for
-        :meth:`attr` + :class:`jinja2.nodes.Call`.
-        """
-        if args is None:
-            args = []
-        if kwargs is None:
-            kwargs = []
-        return nodes.Call(
-            self.attr(name, lineno=lineno),
-            args,
-            kwargs,
-            dyn_args,
-            dyn_kwargs,
-            lineno=lineno,
-        )
-
-
-@contextfunction
-def _gettext_alias(__context, *args, **kwargs):
-    return __context.call(__context.resolve("gettext"), *args, **kwargs)
-
-
-def _make_new_gettext(func):
-    @contextfunction
-    def gettext(__context, __string, **variables):
-        rv = __context.call(func, __string)
-        if __context.eval_ctx.autoescape:
-            rv = Markup(rv)
-        # Always treat as a format string, even if there are no
-        # variables. This makes translation strings more consistent
-        # and predictable. This requires escaping
-        return rv % variables
-
-    return gettext
-
-
-def _make_new_ngettext(func):
-    @contextfunction
-    def ngettext(__context, __singular, __plural, __num, **variables):
-        variables.setdefault("num", __num)
-        rv = __context.call(func, __singular, __plural, __num)
-        if __context.eval_ctx.autoescape:
-            rv = Markup(rv)
-        # Always treat as a format string, see gettext comment above.
-        return rv % variables
-
-    return ngettext
-
-
-class InternationalizationExtension(Extension):
-    """This extension adds gettext support to Jinja."""
-
-    tags = {"trans"}
-
-    # TODO: the i18n extension is currently reevaluating values in a few
-    # situations.  Take this example:
-    #   {% trans count=something() %}{{ count }} foo{% pluralize
-    #     %}{{ count }} fooss{% endtrans %}
-    # something is called twice here.  One time for the gettext value and
-    # the other time for the n-parameter of the ngettext function.
-
-    def __init__(self, environment):
-        Extension.__init__(self, environment)
-        environment.globals["_"] = _gettext_alias
-        environment.extend(
-            install_gettext_translations=self._install,
-            install_null_translations=self._install_null,
-            install_gettext_callables=self._install_callables,
-            uninstall_gettext_translations=self._uninstall,
-            extract_translations=self._extract,
-            newstyle_gettext=False,
-        )
-
-    def _install(self, translations, newstyle=None):
-        # ugettext and ungettext are preferred in case the I18N library
-        # is providing compatibility with older Python versions.
-        gettext = getattr(translations, "ugettext", None)
-        if gettext is None:
-            gettext = translations.gettext
-        ngettext = getattr(translations, "ungettext", None)
-        if ngettext is None:
-            ngettext = translations.ngettext
-        self._install_callables(gettext, ngettext, newstyle)
-
-    def _install_null(self, newstyle=None):
-        self._install_callables(
-            lambda x: x, lambda s, p, n: s if n == 1 else p, newstyle
-        )
-
-    def _install_callables(self, gettext, ngettext, newstyle=None):
-        if newstyle is not None:
-            self.environment.newstyle_gettext = newstyle
-        if self.environment.newstyle_gettext:
-            gettext = _make_new_gettext(gettext)
-            ngettext = _make_new_ngettext(ngettext)
-        self.environment.globals.update(gettext=gettext, ngettext=ngettext)
-
-    def _uninstall(self, translations):
-        for key in "gettext", "ngettext":
-            self.environment.globals.pop(key, None)
-
-    def _extract(self, source, gettext_functions=GETTEXT_FUNCTIONS):
-        if isinstance(source, str):
-            source = self.environment.parse(source)
-        return extract_from_ast(source, gettext_functions)
-
-    def parse(self, parser):
-        """Parse a translatable tag."""
-        lineno = next(parser.stream).lineno
-        num_called_num = False
-
-        # find all the variables referenced.  Additionally a variable can be
-        # defined in the body of the trans block too, but this is checked at
-        # a later state.
-        plural_expr = None
-        plural_expr_assignment = None
-        variables = {}
-        trimmed = None
-        while parser.stream.current.type != "block_end":
-            if variables:
-                parser.stream.expect("comma")
-
-            # skip colon for python compatibility
-            if parser.stream.skip_if("colon"):
-                break
-
-            name = parser.stream.expect("name")
-            if name.value in variables:
-                parser.fail(
-                    f"translatable variable {name.value!r} defined twice.",
-                    name.lineno,
-                    exc=TemplateAssertionError,
-                )
-
-            # expressions
-            if parser.stream.current.type == "assign":
-                next(parser.stream)
-                variables[name.value] = var = parser.parse_expression()
-            elif trimmed is None and name.value in ("trimmed", "notrimmed"):
-                trimmed = name.value == "trimmed"
-                continue
-            else:
-                variables[name.value] = var = nodes.Name(name.value, "load")
-
-            if plural_expr is None:
-                if isinstance(var, nodes.Call):
-                    plural_expr = nodes.Name("_trans", "load")
-                    variables[name.value] = plural_expr
-                    plural_expr_assignment = nodes.Assign(
-                        nodes.Name("_trans", "store"), var
-                    )
-                else:
-                    plural_expr = var
-                num_called_num = name.value == "num"
-
-        parser.stream.expect("block_end")
-
-        plural = None
-        have_plural = False
-        referenced = set()
-
-        # now parse until endtrans or pluralize
-        singular_names, singular = self._parse_block(parser, True)
-        if singular_names:
-            referenced.update(singular_names)
-            if plural_expr is None:
-                plural_expr = nodes.Name(singular_names[0], "load")
-                num_called_num = singular_names[0] == "num"
-
-        # if we have a pluralize block, we parse that too
-        if parser.stream.current.test("name:pluralize"):
-            have_plural = True
-            next(parser.stream)
-            if parser.stream.current.type != "block_end":
-                name = parser.stream.expect("name")
-                if name.value not in variables:
-                    parser.fail(
-                        f"unknown variable {name.value!r} for pluralization",
-                        name.lineno,
-                        exc=TemplateAssertionError,
-                    )
-                plural_expr = variables[name.value]
-                num_called_num = name.value == "num"
-            parser.stream.expect("block_end")
-            plural_names, plural = self._parse_block(parser, False)
-            next(parser.stream)
-            referenced.update(plural_names)
-        else:
-            next(parser.stream)
-
-        # register free names as simple name expressions
-        for var in referenced:
-            if var not in variables:
-                variables[var] = nodes.Name(var, "load")
-
-        if not have_plural:
-            plural_expr = None
-        elif plural_expr is None:
-            parser.fail("pluralize without variables", lineno)
-
-        if trimmed is None:
-            trimmed = self.environment.policies["ext.i18n.trimmed"]
-        if trimmed:
-            singular = self._trim_whitespace(singular)
-            if plural:
-                plural = self._trim_whitespace(plural)
-
-        node = self._make_node(
-            singular,
-            plural,
-            variables,
-            plural_expr,
-            bool(referenced),
-            num_called_num and have_plural,
-        )
-        node.set_lineno(lineno)
-        if plural_expr_assignment is not None:
-            return [plural_expr_assignment, node]
-        else:
-            return node
-
-    def _trim_whitespace(self, string, _ws_re=_ws_re):
-        return _ws_re.sub(" ", string.strip())
-
-    def _parse_block(self, parser, allow_pluralize):
-        """Parse until the next block tag with a given name."""
-        referenced = []
-        buf = []
-        while 1:
-            if parser.stream.current.type == "data":
-                buf.append(parser.stream.current.value.replace("%", "%%"))
-                next(parser.stream)
-            elif parser.stream.current.type == "variable_begin":
-                next(parser.stream)
-                name = parser.stream.expect("name").value
-                referenced.append(name)
-                buf.append(f"%({name})s")
-                parser.stream.expect("variable_end")
-            elif parser.stream.current.type == "block_begin":
-                next(parser.stream)
-                if parser.stream.current.test("name:endtrans"):
-                    break
-                elif parser.stream.current.test("name:pluralize"):
-                    if allow_pluralize:
-                        break
-                    parser.fail(
-                        "a translatable section can have only one pluralize section"
-                    )
-                parser.fail(
-                    "control structures in translatable sections are not allowed"
-                )
-            elif parser.stream.eos:
-                parser.fail("unclosed translation block")
-            else:
-                raise RuntimeError("internal parser error")
-
-        return referenced, concat(buf)
-
-    def _make_node(
-        self, singular, plural, variables, plural_expr, vars_referenced, num_called_num
-    ):
-        """Generates a useful node from the data provided."""
-        # no variables referenced?  no need to escape for old style
-        # gettext invocations only if there are vars.
-        if not vars_referenced and not self.environment.newstyle_gettext:
-            singular = singular.replace("%%", "%")
-            if plural:
-                plural = plural.replace("%%", "%")
-
-        # singular only:
-        if plural_expr is None:
-            gettext = nodes.Name("gettext", "load")
-            node = nodes.Call(gettext, [nodes.Const(singular)], [], None, None)
-
-        # singular and plural
-        else:
-            ngettext = nodes.Name("ngettext", "load")
-            node = nodes.Call(
-                ngettext,
-                [nodes.Const(singular), nodes.Const(plural), plural_expr],
-                [],
-                None,
-                None,
-            )
-
-        # in case newstyle gettext is used, the method is powerful
-        # enough to handle the variable expansion and autoescape
-        # handling itself
-        if self.environment.newstyle_gettext:
-            for key, value in variables.items():
-                # the function adds that later anyways in case num was
-                # called num, so just skip it.
-                if num_called_num and key == "num":
-                    continue
-                node.kwargs.append(nodes.Keyword(key, value))
-
-        # otherwise do that here
-        else:
-            # mark the return value as safe if we are in an
-            # environment with autoescaping turned on
-            node = nodes.MarkSafeIfAutoescape(node)
-            if variables:
-                node = nodes.Mod(
-                    node,
-                    nodes.Dict(
-                        [
-                            nodes.Pair(nodes.Const(key), value)
-                            for key, value in variables.items()
-                        ]
-                    ),
-                )
-        return nodes.Output([node])
-
-
-class ExprStmtExtension(Extension):
-    """Adds a `do` tag to Jinja that works like the print statement just
-    that it doesn't print the return value.
-    """
-
-    tags = {"do"}
-
-    def parse(self, parser):
-        node = nodes.ExprStmt(lineno=next(parser.stream).lineno)
-        node.node = parser.parse_tuple()
-        return node
-
-
-class LoopControlExtension(Extension):
-    """Adds break and continue to the template engine."""
-
-    tags = {"break", "continue"}
-
-    def parse(self, parser):
-        token = next(parser.stream)
-        if token.value == "break":
-            return nodes.Break(lineno=token.lineno)
-        return nodes.Continue(lineno=token.lineno)
-
-
-class WithExtension(Extension):
-    pass
-
-
-class AutoEscapeExtension(Extension):
-    pass
-
-
-class DebugExtension(Extension):
-    """A ``{% debug %}`` tag that dumps the available variables,
-    filters, and tests.
-
-    .. code-block:: html+jinja
-
-        <pre>{% debug %}</pre>
-
-    .. code-block:: text
-
-        {'context': {'cycler': <class 'jinja2.utils.Cycler'>,
-                     ...,
-                     'namespace': <class 'jinja2.utils.Namespace'>},
-         'filters': ['abs', 'attr', 'batch', 'capitalize', 'center', 'count', 'd',
-                     ..., 'urlencode', 'urlize', 'wordcount', 'wordwrap', 'xmlattr'],
-         'tests': ['!=', '<', '<=', '==', '>', '>=', 'callable', 'defined',
-                   ..., 'odd', 'sameas', 'sequence', 'string', 'undefined', 'upper']}
-
-    .. versionadded:: 2.11.0
-    """
-
-    tags = {"debug"}
-
-    def parse(self, parser):
-        lineno = parser.stream.expect("name:debug").lineno
-        context = ContextReference()
-        result = self.call_method("_render", [context], lineno=lineno)
-        return nodes.Output([result], lineno=lineno)
-
-    def _render(self, context):
-        result = {
-            "context": context.get_all(),
-            "filters": sorted(self.environment.filters.keys()),
-            "tests": sorted(self.environment.tests.keys()),
-        }
-
-        # Set the depth since the intent is to show the top few names.
-        if version_info[:2] >= (3, 4):
-            return pprint.pformat(result, depth=3, compact=True)
-        else:
-            return pprint.pformat(result, depth=3)
-
-
-def extract_from_ast(node, gettext_functions=GETTEXT_FUNCTIONS, babel_style=True):
-    """Extract localizable strings from the given template node.  Per
-    default this function returns matches in babel style that means non string
-    parameters as well as keyword arguments are returned as `None`.  This
-    allows Babel to figure out what you really meant if you are using
-    gettext functions that allow keyword arguments for placeholder expansion.
-    If you don't want that behavior set the `babel_style` parameter to `False`
-    which causes only strings to be returned and parameters are always stored
-    in tuples.  As a consequence invalid gettext calls (calls without a single
-    string parameter or string parameters after non-string parameters) are
-    skipped.
-
-    This example explains the behavior:
-
-    >>> from jinja2 import Environment
-    >>> env = Environment()
-    >>> node = env.parse('{{ (_("foo"), _(), ngettext("foo", "bar", 42)) }}')
-    >>> list(extract_from_ast(node))
-    [(1, '_', 'foo'), (1, '_', ()), (1, 'ngettext', ('foo', 'bar', None))]
-    >>> list(extract_from_ast(node, babel_style=False))
-    [(1, '_', ('foo',)), (1, 'ngettext', ('foo', 'bar'))]
-
-    For every string found this function yields a ``(lineno, function,
-    message)`` tuple, where:
-
-    * ``lineno`` is the number of the line on which the string was found,
-    * ``function`` is the name of the ``gettext`` function used (if the
-      string was extracted from embedded Python code), and
-    *   ``message`` is the string, or a tuple of strings for functions
-         with multiple string arguments.
-
-    This extraction function operates on the AST and is because of that unable
-    to extract any comments.  For comment support you have to use the babel
-    extraction interface or extract comments yourself.
-    """
-    for node in node.find_all(nodes.Call):
-        if (
-            not isinstance(node.node, nodes.Name)
-            or node.node.name not in gettext_functions
-        ):
-            continue
-
-        strings = []
-        for arg in node.args:
-            if isinstance(arg, nodes.Const) and isinstance(arg.value, str):
-                strings.append(arg.value)
-            else:
-                strings.append(None)
-
-        for _ in node.kwargs:
-            strings.append(None)
-        if node.dyn_args is not None:
-            strings.append(None)
-        if node.dyn_kwargs is not None:
-            strings.append(None)
-
-        if not babel_style:
-            strings = tuple(x for x in strings if x is not None)
-            if not strings:
-                continue
-        else:
-            if len(strings) == 1:
-                strings = strings[0]
-            else:
-                strings = tuple(strings)
-        yield node.lineno, node.node.name, strings
-
-
-class _CommentFinder:
-    """Helper class to find comments in a token stream.  Can only
-    find comments for gettext calls forwards.  Once the comment
-    from line 4 is found, a comment for line 1 will not return a
-    usable value.
-    """
-
-    def __init__(self, tokens, comment_tags):
-        self.tokens = tokens
-        self.comment_tags = comment_tags
-        self.offset = 0
-        self.last_lineno = 0
-
-    def find_backwards(self, offset):
-        try:
-            for _, token_type, token_value in reversed(
-                self.tokens[self.offset : offset]
-            ):
-                if token_type in ("comment", "linecomment"):
-                    try:
-                        prefix, comment = token_value.split(None, 1)
-                    except ValueError:
-                        continue
-                    if prefix in self.comment_tags:
-                        return [comment.rstrip()]
-            return []
-        finally:
-            self.offset = offset
-
-    def find_comments(self, lineno):
-        if not self.comment_tags or self.last_lineno > lineno:
-            return []
-        for idx, (token_lineno, _, _) in enumerate(self.tokens[self.offset :]):
-            if token_lineno > lineno:
-                return self.find_backwards(self.offset + idx)
-        return self.find_backwards(len(self.tokens))
-
-
-def babel_extract(fileobj, keywords, comment_tags, options):
-    """Babel extraction method for Jinja templates.
-
-    .. versionchanged:: 2.3
-       Basic support for translation comments was added.  If `comment_tags`
-       is now set to a list of keywords for extraction, the extractor will
-       try to find the best preceding comment that begins with one of the
-       keywords.  For best results, make sure to not have more than one
-       gettext call in one line of code and the matching comment in the
-       same line or the line before.
-
-    .. versionchanged:: 2.5.1
-       The `newstyle_gettext` flag can be set to `True` to enable newstyle
-       gettext calls.
-
-    .. versionchanged:: 2.7
-       A `silent` option can now be provided.  If set to `False` template
-       syntax errors are propagated instead of being ignored.
-
-    :param fileobj: the file-like object the messages should be extracted from
-    :param keywords: a list of keywords (i.e. function names) that should be
-                     recognized as translation functions
-    :param comment_tags: a list of translator tags to search for and include
-                         in the results.
-    :param options: a dictionary of additional options (optional)
-    :return: an iterator over ``(lineno, funcname, message, comments)`` tuples.
-             (comments will be empty currently)
-    """
-    extensions = set()
-    for extension in options.get("extensions", "").split(","):
-        extension = extension.strip()
-        if not extension:
-            continue
-        extensions.add(import_string(extension))
-    if InternationalizationExtension not in extensions:
-        extensions.add(InternationalizationExtension)
-
-    def getbool(options, key, default=False):
-        return options.get(key, str(default)).lower() in ("1", "on", "yes", "true")
-
-    silent = getbool(options, "silent", True)
-    environment = Environment(
-        options.get("block_start_string", BLOCK_START_STRING),
-        options.get("block_end_string", BLOCK_END_STRING),
-        options.get("variable_start_string", VARIABLE_START_STRING),
-        options.get("variable_end_string", VARIABLE_END_STRING),
-        options.get("comment_start_string", COMMENT_START_STRING),
-        options.get("comment_end_string", COMMENT_END_STRING),
-        options.get("line_statement_prefix") or LINE_STATEMENT_PREFIX,
-        options.get("line_comment_prefix") or LINE_COMMENT_PREFIX,
-        getbool(options, "trim_blocks", TRIM_BLOCKS),
-        getbool(options, "lstrip_blocks", LSTRIP_BLOCKS),
-        NEWLINE_SEQUENCE,
-        getbool(options, "keep_trailing_newline", KEEP_TRAILING_NEWLINE),
-        frozenset(extensions),
-        cache_size=0,
-        auto_reload=False,
-    )
-
-    if getbool(options, "trimmed"):
-        environment.policies["ext.i18n.trimmed"] = True
-    if getbool(options, "newstyle_gettext"):
-        environment.newstyle_gettext = True
-
-    source = fileobj.read().decode(options.get("encoding", "utf-8"))
-    try:
-        node = environment.parse(source)
-        tokens = list(environment.lex(environment.preprocess(source)))
-    except TemplateSyntaxError:
-        if not silent:
-            raise
-        # skip templates with syntax errors
-        return
-
-    finder = _CommentFinder(tokens, comment_tags)
-    for lineno, func, message in extract_from_ast(node, keywords):
-        yield lineno, func, message, finder.find_comments(lineno)
-
-
-#: nicer import names
-i18n = InternationalizationExtension
-do = ExprStmtExtension
-loopcontrols = LoopControlExtension
-with_ = WithExtension
-autoescape = AutoEscapeExtension
-debug = DebugExtension
diff --git a/src/jinja2/filters.py b/src/jinja2/filters.py
deleted file mode 100644
index c257d4c5..00000000
--- a/src/jinja2/filters.py
+++ /dev/null
@@ -1,1361 +0,0 @@
-"""Built-in template filters used with the ``|`` operator."""
-import math
-import random
-import re
-from collections import abc
-from collections import namedtuple
-from itertools import chain
-from itertools import groupby
-
-from markupsafe import escape
-from markupsafe import Markup
-from markupsafe import soft_str
-
-from .exceptions import FilterArgumentError
-from .runtime import Undefined
-from .utils import htmlsafe_json_dumps
-from .utils import pformat
-from .utils import url_quote
-from .utils import urlize
-
-_word_re = re.compile(r"\w+")
-_word_beginning_split_re = re.compile(r"([-\s({\[<]+)")
-
-
-def contextfilter(f):
-    """Decorator for marking context dependent filters. The current
-    :class:`Context` will be passed as first argument.
-    """
-    f.contextfilter = True
-    return f
-
-
-def evalcontextfilter(f):
-    """Decorator for marking eval-context dependent filters.  An eval
-    context object is passed as first argument.  For more information
-    about the eval context, see :ref:`eval-context`.
-
-    .. versionadded:: 2.4
-    """
-    f.evalcontextfilter = True
-    return f
-
-
-def environmentfilter(f):
-    """Decorator for marking environment dependent filters.  The current
-    :class:`Environment` is passed to the filter as first argument.
-    """
-    f.environmentfilter = True
-    return f
-
-
-def ignore_case(value):
-    """For use as a postprocessor for :func:`make_attrgetter`. Converts strings
-    to lowercase and returns other types as-is."""
-    return value.lower() if isinstance(value, str) else value
-
-
-def make_attrgetter(environment, attribute, postprocess=None, default=None):
-    """Returns a callable that looks up the given attribute from a
-    passed object with the rules of the environment.  Dots are allowed
-    to access attributes of attributes.  Integer parts in paths are
-    looked up as integers.
-    """
-    attribute = _prepare_attribute_parts(attribute)
-
-    def attrgetter(item):
-        for part in attribute:
-            item = environment.getitem(item, part)
-
-            if default and isinstance(item, Undefined):
-                item = default
-
-        if postprocess is not None:
-            item = postprocess(item)
-
-        return item
-
-    return attrgetter
-
-
-def make_multi_attrgetter(environment, attribute, postprocess=None):
-    """Returns a callable that looks up the given comma separated
-    attributes from a passed object with the rules of the environment.
-    Dots are allowed to access attributes of each attribute.  Integer
-    parts in paths are looked up as integers.
-
-    The value returned by the returned callable is a list of extracted
-    attribute values.
-
-    Examples of attribute: "attr1,attr2", "attr1.inner1.0,attr2.inner2.0", etc.
-    """
-    attribute_parts = (
-        attribute.split(",") if isinstance(attribute, str) else [attribute]
-    )
-    attribute = [
-        _prepare_attribute_parts(attribute_part) for attribute_part in attribute_parts
-    ]
-
-    def attrgetter(item):
-        items = [None] * len(attribute)
-        for i, attribute_part in enumerate(attribute):
-            item_i = item
-            for part in attribute_part:
-                item_i = environment.getitem(item_i, part)
-
-            if postprocess is not None:
-                item_i = postprocess(item_i)
-
-            items[i] = item_i
-        return items
-
-    return attrgetter
-
-
-def _prepare_attribute_parts(attr):
-    if attr is None:
-        return []
-    elif isinstance(attr, str):
-        return [int(x) if x.isdigit() else x for x in attr.split(".")]
-    else:
-        return [attr]
-
-
-def do_forceescape(value):
-    """Enforce HTML escaping.  This will probably double escape variables."""
-    if hasattr(value, "__html__"):
-        value = value.__html__()
-    return escape(str(value))
-
-
-def do_urlencode(value):
-    """Quote data for use in a URL path or query using UTF-8.
-
-    Basic wrapper around :func:`urllib.parse.quote` when given a
-    string, or :func:`urllib.parse.urlencode` for a dict or iterable.
-
-    :param value: Data to quote. A string will be quoted directly. A
-        dict or iterable of ``(key, value)`` pairs will be joined as a
-        query string.
-
-    When given a string, "/" is not quoted. HTTP servers treat "/" and
-    "%2F" equivalently in paths. If you need quoted slashes, use the
-    ``|replace("/", "%2F")`` filter.
-
-    .. versionadded:: 2.7
-    """
-    if isinstance(value, str) or not isinstance(value, abc.Iterable):
-        return url_quote(value)
-
-    if isinstance(value, dict):
-        items = value.items()
-    else:
-        items = iter(value)
-
-    return "&".join(
-        f"{url_quote(k, for_qs=True)}={url_quote(v, for_qs=True)}" for k, v in items
-    )
-
-
-@evalcontextfilter
-def do_replace(eval_ctx, s, old, new, count=None):
-    """Return a copy of the value with all occurrences of a substring
-    replaced with a new one. The first argument is the substring
-    that should be replaced, the second is the replacement string.
-    If the optional third argument ``count`` is given, only the first
-    ``count`` occurrences are replaced:
-
-    .. sourcecode:: jinja
-
-        {{ "Hello World"|replace("Hello", "Goodbye") }}
-            -> Goodbye World
-
-        {{ "aaaaargh"|replace("a", "d'oh, ", 2) }}
-            -> d'oh, d'oh, aaargh
-    """
-    if count is None:
-        count = -1
-    if not eval_ctx.autoescape:
-        return str(s).replace(str(old), str(new), count)
-    if (
-        hasattr(old, "__html__")
-        or hasattr(new, "__html__")
-        and not hasattr(s, "__html__")
-    ):
-        s = escape(s)
-    else:
-        s = soft_str(s)
-    return s.replace(soft_str(old), soft_str(new), count)
-
-
-def do_upper(s):
-    """Convert a value to uppercase."""
-    return soft_str(s).upper()
-
-
-def do_lower(s):
-    """Convert a value to lowercase."""
-    return soft_str(s).lower()
-
-
-@evalcontextfilter
-def do_xmlattr(_eval_ctx, d, autospace=True):
-    """Create an SGML/XML attribute string based on the items in a dict.
-    All values that are neither `none` nor `undefined` are automatically
-    escaped:
-
-    .. sourcecode:: html+jinja
-
-        <ul{{ {'class': 'my_list', 'missing': none,
-                'id': 'list-%d'|format(variable)}|xmlattr }}>
-        ...
-        </ul>
-
-    Results in something like this:
-
-    .. sourcecode:: html
-
-        <ul class="my_list" id="list-42">
-        ...
-        </ul>
-
-    As you can see it automatically prepends a space in front of the item
-    if the filter returned something unless the second parameter is false.
-    """
-    rv = " ".join(
-        f'{escape(key)}="{escape(value)}"'
-        for key, value in d.items()
-        if value is not None and not isinstance(value, Undefined)
-    )
-    if autospace and rv:
-        rv = " " + rv
-    if _eval_ctx.autoescape:
-        rv = Markup(rv)
-    return rv
-
-
-def do_capitalize(s):
-    """Capitalize a value. The first character will be uppercase, all others
-    lowercase.
-    """
-    return soft_str(s).capitalize()
-
-
-def do_title(s):
-    """Return a titlecased version of the value. I.e. words will start with
-    uppercase letters, all remaining characters are lowercase.
-    """
-    return "".join(
-        [
-            item[0].upper() + item[1:].lower()
-            for item in _word_beginning_split_re.split(soft_str(s))
-            if item
-        ]
-    )
-
-
-def do_dictsort(value, case_sensitive=False, by="key", reverse=False):
-    """Sort a dict and yield (key, value) pairs. Because python dicts are
-    unsorted you may want to use this function to order them by either
-    key or value:
-
-    .. sourcecode:: jinja
-
-        {% for item in mydict|dictsort %}
-            sort the dict by key, case insensitive
-
-        {% for item in mydict|dictsort(reverse=true) %}
-            sort the dict by key, case insensitive, reverse order
-
-        {% for item in mydict|dictsort(true) %}
-            sort the dict by key, case sensitive
-
-        {% for item in mydict|dictsort(false, 'value') %}
-            sort the dict by value, case insensitive
-    """
-    if by == "key":
-        pos = 0
-    elif by == "value":
-        pos = 1
-    else:
-        raise FilterArgumentError('You can only sort by either "key" or "value"')
-
-    def sort_func(item):
-        value = item[pos]
-
-        if not case_sensitive:
-            value = ignore_case(value)
-
-        return value
-
-    return sorted(value.items(), key=sort_func, reverse=reverse)
-
-
-@environmentfilter
-def do_sort(environment, value, reverse=False, case_sensitive=False, attribute=None):
-    """Sort an iterable using Python's :func:`sorted`.
-
-    .. sourcecode:: jinja
-
-        {% for city in cities|sort %}
-            ...
-        {% endfor %}
-
-    :param reverse: Sort descending instead of ascending.
-    :param case_sensitive: When sorting strings, sort upper and lower
-        case separately.
-    :param attribute: When sorting objects or dicts, an attribute or
-        key to sort by. Can use dot notation like ``"address.city"``.
-        Can be a list of attributes like ``"age,name"``.
-
-    The sort is stable, it does not change the relative order of
-    elements that compare equal. This makes it is possible to chain
-    sorts on different attributes and ordering.
-
-    .. sourcecode:: jinja
-
-        {% for user in users|sort(attribute="name")
-            |sort(reverse=true, attribute="age") %}
-            ...
-        {% endfor %}
-
-    As a shortcut to chaining when the direction is the same for all
-    attributes, pass a comma separate list of attributes.
-
-    .. sourcecode:: jinja
-
-        {% for user users|sort(attribute="age,name") %}
-            ...
-        {% endfor %}
-
-    .. versionchanged:: 2.11.0
-        The ``attribute`` parameter can be a comma separated list of
-        attributes, e.g. ``"age,name"``.
-
-    .. versionchanged:: 2.6
-       The ``attribute`` parameter was added.
-    """
-    key_func = make_multi_attrgetter(
-        environment, attribute, postprocess=ignore_case if not case_sensitive else None
-    )
-    return sorted(value, key=key_func, reverse=reverse)
-
-
-@environmentfilter
-def do_unique(environment, value, case_sensitive=False, attribute=None):
-    """Returns a list of unique items from the given iterable.
-
-    .. sourcecode:: jinja
-
-        {{ ['foo', 'bar', 'foobar', 'FooBar']|unique|list }}
-            -> ['foo', 'bar', 'foobar']
-
-    The unique items are yielded in the same order as their first occurrence in
-    the iterable passed to the filter.
-
-    :param case_sensitive: Treat upper and lower case strings as distinct.
-    :param attribute: Filter objects with unique values for this attribute.
-    """
-    getter = make_attrgetter(
-        environment, attribute, postprocess=ignore_case if not case_sensitive else None
-    )
-    seen = set()
-
-    for item in value:
-        key = getter(item)
-
-        if key not in seen:
-            seen.add(key)
-            yield item
-
-
-def _min_or_max(environment, value, func, case_sensitive, attribute):
-    it = iter(value)
-
-    try:
-        first = next(it)
-    except StopIteration:
-        return environment.undefined("No aggregated item, sequence was empty.")
-
-    key_func = make_attrgetter(
-        environment, attribute, postprocess=ignore_case if not case_sensitive else None
-    )
-    return func(chain([first], it), key=key_func)
-
-
-@environmentfilter
-def do_min(environment, value, case_sensitive=False, attribute=None):
-    """Return the smallest item from the sequence.
-
-    .. sourcecode:: jinja
-
-        {{ [1, 2, 3]|min }}
-            -> 1
-
-    :param case_sensitive: Treat upper and lower case strings as distinct.
-    :param attribute: Get the object with the min value of this attribute.
-    """
-    return _min_or_max(environment, value, min, case_sensitive, attribute)
-
-
-@environmentfilter
-def do_max(environment, value, case_sensitive=False, attribute=None):
-    """Return the largest item from the sequence.
-
-    .. sourcecode:: jinja
-
-        {{ [1, 2, 3]|max }}
-            -> 3
-
-    :param case_sensitive: Treat upper and lower case strings as distinct.
-    :param attribute: Get the object with the max value of this attribute.
-    """
-    return _min_or_max(environment, value, max, case_sensitive, attribute)
-
-
-def do_default(value, default_value="", boolean=False):
-    """If the value is undefined it will return the passed default value,
-    otherwise the value of the variable:
-
-    .. sourcecode:: jinja
-
-        {{ my_variable|default('my_variable is not defined') }}
-
-    This will output the value of ``my_variable`` if the variable was
-    defined, otherwise ``'my_variable is not defined'``. If you want
-    to use default with variables that evaluate to false you have to
-    set the second parameter to `true`:
-
-    .. sourcecode:: jinja
-
-        {{ ''|default('the string was empty', true) }}
-
-    .. versionchanged:: 2.11
-       It's now possible to configure the :class:`~jinja2.Environment` with
-       :class:`~jinja2.ChainableUndefined` to make the `default` filter work
-       on nested elements and attributes that may contain undefined values
-       in the chain without getting an :exc:`~jinja2.UndefinedError`.
-    """
-    if isinstance(value, Undefined) or (boolean and not value):
-        return default_value
-    return value
-
-
-@evalcontextfilter
-def do_join(eval_ctx, value, d="", attribute=None):
-    """Return a string which is the concatenation of the strings in the
-    sequence. The separator between elements is an empty string per
-    default, you can define it with the optional parameter:
-
-    .. sourcecode:: jinja
-
-        {{ [1, 2, 3]|join('|') }}
-            -> 1|2|3
-
-        {{ [1, 2, 3]|join }}
-            -> 123
-
-    It is also possible to join certain attributes of an object:
-
-    .. sourcecode:: jinja
-
-        {{ users|join(', ', attribute='username') }}
-
-    .. versionadded:: 2.6
-       The `attribute` parameter was added.
-    """
-    if attribute is not None:
-        value = map(make_attrgetter(eval_ctx.environment, attribute), value)
-
-    # no automatic escaping?  joining is a lot easier then
-    if not eval_ctx.autoescape:
-        return str(d).join(map(str, value))
-
-    # if the delimiter doesn't have an html representation we check
-    # if any of the items has.  If yes we do a coercion to Markup
-    if not hasattr(d, "__html__"):
-        value = list(value)
-        do_escape = False
-        for idx, item in enumerate(value):
-            if hasattr(item, "__html__"):
-                do_escape = True
-            else:
-                value[idx] = str(item)
-        if do_escape:
-            d = escape(d)
-        else:
-            d = str(d)
-        return d.join(value)
-
-    # no html involved, to normal joining
-    return soft_str(d).join(map(soft_str, value))
-
-
-def do_center(value, width=80):
-    """Centers the value in a field of a given width."""
-    return str(value).center(width)
-
-
-@environmentfilter
-def do_first(environment, seq):
-    """Return the first item of a sequence."""
-    try:
-        return next(iter(seq))
-    except StopIteration:
-        return environment.undefined("No first item, sequence was empty.")
-
-
-@environmentfilter
-def do_last(environment, seq):
-    """
-    Return the last item of a sequence.
-
-    Note: Does not work with generators. You may want to explicitly
-    convert it to a list:
-
-    .. sourcecode:: jinja
-
-        {{ data | selectattr('name', '==', 'Jinja') | list | last }}
-    """
-    try:
-        return next(iter(reversed(seq)))
-    except StopIteration:
-        return environment.undefined("No last item, sequence was empty.")
-
-
-@contextfilter
-def do_random(context, seq):
-    """Return a random item from the sequence."""
-    try:
-        return random.choice(seq)
-    except IndexError:
-        return context.environment.undefined("No random item, sequence was empty.")
-
-
-def do_filesizeformat(value, binary=False):
-    """Format the value like a 'human-readable' file size (i.e. 13 kB,
-    4.1 MB, 102 Bytes, etc).  Per default decimal prefixes are used (Mega,
-    Giga, etc.), if the second parameter is set to `True` the binary
-    prefixes are used (Mebi, Gibi).
-    """
-    bytes = float(value)
-    base = 1024 if binary else 1000
-    prefixes = [
-        ("KiB" if binary else "kB"),
-        ("MiB" if binary else "MB"),
-        ("GiB" if binary else "GB"),
-        ("TiB" if binary else "TB"),
-        ("PiB" if binary else "PB"),
-        ("EiB" if binary else "EB"),
-        ("ZiB" if binary else "ZB"),
-        ("YiB" if binary else "YB"),
-    ]
-    if bytes == 1:
-        return "1 Byte"
-    elif bytes < base:
-        return f"{int(bytes)} Bytes"
-    else:
-        for i, prefix in enumerate(prefixes):
-            unit = base ** (i + 2)
-            if bytes < unit:
-                return f"{base * bytes / unit:.1f} {prefix}"
-        return f"{base * bytes / unit:.1f} {prefix}"
-
-
-def do_pprint(value):
-    """Pretty print a variable. Useful for debugging."""
-    return pformat(value)
-
-
-@evalcontextfilter
-def do_urlize(
-    eval_ctx, value, trim_url_limit=None, nofollow=False, target=None, rel=None
-):
-    """Converts URLs in plain text into clickable links.
-
-    If you pass the filter an additional integer it will shorten the urls
-    to that number. Also a third argument exists that makes the urls
-    "nofollow":
-
-    .. sourcecode:: jinja
-
-        {{ mytext|urlize(40, true) }}
-            links are shortened to 40 chars and defined with rel="nofollow"
-
-    If *target* is specified, the ``target`` attribute will be added to the
-    ``<a>`` tag:
-
-    .. sourcecode:: jinja
-
-       {{ mytext|urlize(40, target='_blank') }}
-
-    .. versionchanged:: 2.8
-       The ``target`` parameter was added.
-    """
-    policies = eval_ctx.environment.policies
-    rel = set((rel or "").split() or [])
-    if nofollow:
-        rel.add("nofollow")
-    rel.update((policies["urlize.rel"] or "").split())
-    if target is None:
-        target = policies["urlize.target"]
-    rel = " ".join(sorted(rel)) or None
-    rv = urlize(value, trim_url_limit, rel=rel, target=target)
-    if eval_ctx.autoescape:
-        rv = Markup(rv)
-    return rv
-
-
-def do_indent(s, width=4, first=False, blank=False):
-    """Return a copy of the string with each line indented by 4 spaces. The
-    first line and blank lines are not indented by default.
-
-    :param width: Number of spaces to indent by.
-    :param first: Don't skip indenting the first line.
-    :param blank: Don't skip indenting empty lines.
-
-    .. versionchanged:: 2.10
-        Blank lines are not indented by default.
-
-        Rename the ``indentfirst`` argument to ``first``.
-    """
-    indention = " " * width
-    newline = "\n"
-
-    if isinstance(s, Markup):
-        indention = Markup(indention)
-        newline = Markup(newline)
-
-    s += newline  # this quirk is necessary for splitlines method
-
-    if blank:
-        rv = (newline + indention).join(s.splitlines())
-    else:
-        lines = s.splitlines()
-        rv = lines.pop(0)
-
-        if lines:
-            rv += newline + newline.join(
-                indention + line if line else line for line in lines
-            )
-
-    if first:
-        rv = indention + rv
-
-    return rv
-
-
-@environmentfilter
-def do_truncate(env, s, length=255, killwords=False, end="...", leeway=None):
-    """Return a truncated copy of the string. The length is specified
-    with the first parameter which defaults to ``255``. If the second
-    parameter is ``true`` the filter will cut the text at length. Otherwise
-    it will discard the last word. If the text was in fact
-    truncated it will append an ellipsis sign (``"..."``). If you want a
-    different ellipsis sign than ``"..."`` you can specify it using the
-    third parameter. Strings that only exceed the length by the tolerance
-    margin given in the fourth parameter will not be truncated.
-
-    .. sourcecode:: jinja
-
-        {{ "foo bar baz qux"|truncate(9) }}
-            -> "foo..."
-        {{ "foo bar baz qux"|truncate(9, True) }}
-            -> "foo ba..."
-        {{ "foo bar baz qux"|truncate(11) }}
-            -> "foo bar baz qux"
-        {{ "foo bar baz qux"|truncate(11, False, '...', 0) }}
-            -> "foo bar..."
-
-    The default leeway on newer Jinja versions is 5 and was 0 before but
-    can be reconfigured globally.
-    """
-    if leeway is None:
-        leeway = env.policies["truncate.leeway"]
-    assert length >= len(end), f"expected length >= {len(end)}, got {length}"
-    assert leeway >= 0, f"expected leeway >= 0, got {leeway}"
-    if len(s) <= length + leeway:
-        return s
-    if killwords:
-        return s[: length - len(end)] + end
-    result = s[: length - len(end)].rsplit(" ", 1)[0]
-    return result + end
-
-
-@environmentfilter
-def do_wordwrap(
-    environment,
-    s,
-    width=79,
-    break_long_words=True,
-    wrapstring=None,
-    break_on_hyphens=True,
-):
-    """Wrap a string to the given width. Existing newlines are treated
-    as paragraphs to be wrapped separately.
-
-    :param s: Original text to wrap.
-    :param width: Maximum length of wrapped lines.
-    :param break_long_words: If a word is longer than ``width``, break
-        it across lines.
-    :param break_on_hyphens: If a word contains hyphens, it may be split
-        across lines.
-    :param wrapstring: String to join each wrapped line. Defaults to
-        :attr:`Environment.newline_sequence`.
-
-    .. versionchanged:: 2.11
-        Existing newlines are treated as paragraphs wrapped separately.
-
-    .. versionchanged:: 2.11
-        Added the ``break_on_hyphens`` parameter.
-
-    .. versionchanged:: 2.7
-        Added the ``wrapstring`` parameter.
-    """
-
-    import textwrap
-
-    if not wrapstring:
-        wrapstring = environment.newline_sequence
-
-    # textwrap.wrap doesn't consider existing newlines when wrapping.
-    # If the string has a newline before width, wrap will still insert
-    # a newline at width, resulting in a short line. Instead, split and
-    # wrap each paragraph individually.
-    return wrapstring.join(
-        [
-            wrapstring.join(
-                textwrap.wrap(
-                    line,
-                    width=width,
-                    expand_tabs=False,
-                    replace_whitespace=False,
-                    break_long_words=break_long_words,
-                    break_on_hyphens=break_on_hyphens,
-                )
-            )
-            for line in s.splitlines()
-        ]
-    )
-
-
-def do_wordcount(s):
-    """Count the words in that string."""
-    return len(_word_re.findall(soft_str(s)))
-
-
-def do_int(value, default=0, base=10):
-    """Convert the value into an integer. If the
-    conversion doesn't work it will return ``0``. You can
-    override this default using the first parameter. You
-    can also override the default base (10) in the second
-    parameter, which handles input with prefixes such as
-    0b, 0o and 0x for bases 2, 8 and 16 respectively.
-    The base is ignored for decimal numbers and non-string values.
-    """
-    try:
-        if isinstance(value, str):
-            return int(value, base)
-        return int(value)
-    except (TypeError, ValueError):
-        # this quirk is necessary so that "42.23"|int gives 42.
-        try:
-            return int(float(value))
-        except (TypeError, ValueError):
-            return default
-
-
-def do_float(value, default=0.0):
-    """Convert the value into a floating point number. If the
-    conversion doesn't work it will return ``0.0``. You can
-    override this default using the first parameter.
-    """
-    try:
-        return float(value)
-    except (TypeError, ValueError):
-        return default
-
-
-def do_format(value, *args, **kwargs):
-    """Apply the given values to a `printf-style`_ format string, like
-    ``string % values``.
-
-    .. sourcecode:: jinja
-
-        {{ "%s, %s!"|format(greeting, name) }}
-        Hello, World!
-
-    In most cases it should be more convenient and efficient to use the
-    ``%`` operator or :meth:`str.format`.
-
-    .. code-block:: text
-
-        {{ "%s, %s!" % (greeting, name) }}
-        {{ "{}, {}!".format(greeting, name) }}
-
-    .. _printf-style: https://docs.python.org/library/stdtypes.html
-        #printf-style-string-formatting
-    """
-    if args and kwargs:
-        raise FilterArgumentError(
-            "can't handle positional and keyword arguments at the same time"
-        )
-    return soft_str(value) % (kwargs or args)
-
-
-def do_trim(value, chars=None):
-    """Strip leading and trailing characters, by default whitespace."""
-    return soft_str(value).strip(chars)
-
-
-def do_striptags(value):
-    """Strip SGML/XML tags and replace adjacent whitespace by one space."""
-    if hasattr(value, "__html__"):
-        value = value.__html__()
-    return Markup(str(value)).striptags()
-
-
-def do_slice(value, slices, fill_with=None):
-    """Slice an iterator and return a list of lists containing
-    those items. Useful if you want to create a div containing
-    three ul tags that represent columns:
-
-    .. sourcecode:: html+jinja
-
-        <div class="columnwrapper">
-          {%- for column in items|slice(3) %}
-            <ul class="column-{{ loop.index }}">
-            {%- for item in column %}
-              <li>{{ item }}</li>
-            {%- endfor %}
-            </ul>
-          {%- endfor %}
-        </div>
-
-    If you pass it a second argument it's used to fill missing
-    values on the last iteration.
-    """
-    seq = list(value)
-    length = len(seq)
-    items_per_slice = length // slices
-    slices_with_extra = length % slices
-    offset = 0
-    for slice_number in range(slices):
-        start = offset + slice_number * items_per_slice
-        if slice_number < slices_with_extra:
-            offset += 1
-        end = offset + (slice_number + 1) * items_per_slice
-        tmp = seq[start:end]
-        if fill_with is not None and slice_number >= slices_with_extra:
-            tmp.append(fill_with)
-        yield tmp
-
-
-def do_batch(value, linecount, fill_with=None):
-    """
-    A filter that batches items. It works pretty much like `slice`
-    just the other way round. It returns a list of lists with the
-    given number of items. If you provide a second parameter this
-    is used to fill up missing items. See this example:
-
-    .. sourcecode:: html+jinja
-
-        <table>
-        {%- for row in items|batch(3, '&nbsp;') %}
-          <tr>
-          {%- for column in row %}
-            <td>{{ column }}</td>
-          {%- endfor %}
-          </tr>
-        {%- endfor %}
-        </table>
-    """
-    tmp = []
-    for item in value:
-        if len(tmp) == linecount:
-            yield tmp
-            tmp = []
-        tmp.append(item)
-    if tmp:
-        if fill_with is not None and len(tmp) < linecount:
-            tmp += [fill_with] * (linecount - len(tmp))
-        yield tmp
-
-
-def do_round(value, precision=0, method="common"):
-    """Round the number to a given precision. The first
-    parameter specifies the precision (default is ``0``), the
-    second the rounding method:
-
-    - ``'common'`` rounds either up or down
-    - ``'ceil'`` always rounds up
-    - ``'floor'`` always rounds down
-
-    If you don't specify a method ``'common'`` is used.
-
-    .. sourcecode:: jinja
-
-        {{ 42.55|round }}
-            -> 43.0
-        {{ 42.55|round(1, 'floor') }}
-            -> 42.5
-
-    Note that even if rounded to 0 precision, a float is returned.  If
-    you need a real integer, pipe it through `int`:
-
-    .. sourcecode:: jinja
-
-        {{ 42.55|round|int }}
-            -> 43
-    """
-    if method not in {"common", "ceil", "floor"}:
-        raise FilterArgumentError("method must be common, ceil or floor")
-    if method == "common":
-        return round(value, precision)
-    func = getattr(math, method)
-    return func(value * (10 ** precision)) / (10 ** precision)
-
-
-# Use a regular tuple repr here.  This is what we did in the past and we
-# really want to hide this custom type as much as possible.  In particular
-# we do not want to accidentally expose an auto generated repr in case
-# people start to print this out in comments or something similar for
-# debugging.
-_GroupTuple = namedtuple("_GroupTuple", ["grouper", "list"])
-_GroupTuple.__repr__ = tuple.__repr__
-_GroupTuple.__str__ = tuple.__str__
-
-
-@environmentfilter
-def do_groupby(environment, value, attribute):
-    """Group a sequence of objects by an attribute using Python's
-    :func:`itertools.groupby`. The attribute can use dot notation for
-    nested access, like ``"address.city"``. Unlike Python's ``groupby``,
-    the values are sorted first so only one group is returned for each
-    unique value.
-
-    For example, a list of ``User`` objects with a ``city`` attribute
-    can be rendered in groups. In this example, ``grouper`` refers to
-    the ``city`` value of the group.
-
-    .. sourcecode:: html+jinja
-
-        <ul>{% for city, items in users|groupby("city") %}
-          <li>{{ city }}
-            <ul>{% for user in items %}
-              <li>{{ user.name }}
-            {% endfor %}</ul>
-          </li>
-        {% endfor %}</ul>
-
-    ``groupby`` yields namedtuples of ``(grouper, list)``, which
-    can be used instead of the tuple unpacking above. ``grouper`` is the
-    value of the attribute, and ``list`` is the items with that value.
-
-    .. sourcecode:: html+jinja
-
-        <ul>{% for group in users|groupby("city") %}
-          <li>{{ group.grouper }}: {{ group.list|join(", ") }}
-        {% endfor %}</ul>
-
-    .. versionchanged:: 2.6
-        The attribute supports dot notation for nested access.
-    """
-    expr = make_attrgetter(environment, attribute)
-    return [
-        _GroupTuple(key, list(values))
-        for key, values in groupby(sorted(value, key=expr), expr)
-    ]
-
-
-@environmentfilter
-def do_sum(environment, iterable, attribute=None, start=0):
-    """Returns the sum of a sequence of numbers plus the value of parameter
-    'start' (which defaults to 0).  When the sequence is empty it returns
-    start.
-
-    It is also possible to sum up only certain attributes:
-
-    .. sourcecode:: jinja
-
-        Total: {{ items|sum(attribute='price') }}
-
-    .. versionchanged:: 2.6
-       The `attribute` parameter was added to allow suming up over
-       attributes.  Also the `start` parameter was moved on to the right.
-    """
-    if attribute is not None:
-        iterable = map(make_attrgetter(environment, attribute), iterable)
-    return sum(iterable, start)
-
-
-def do_list(value):
-    """Convert the value into a list.  If it was a string the returned list
-    will be a list of characters.
-    """
-    return list(value)
-
-
-def do_mark_safe(value):
-    """Mark the value as safe which means that in an environment with automatic
-    escaping enabled this variable will not be escaped.
-    """
-    return Markup(value)
-
-
-def do_mark_unsafe(value):
-    """Mark a value as unsafe.  This is the reverse operation for :func:`safe`."""
-    return str(value)
-
-
-def do_reverse(value):
-    """Reverse the object or return an iterator that iterates over it the other
-    way round.
-    """
-    if isinstance(value, str):
-        return value[::-1]
-    try:
-        return reversed(value)
-    except TypeError:
-        try:
-            rv = list(value)
-            rv.reverse()
-            return rv
-        except TypeError:
-            raise FilterArgumentError("argument must be iterable")
-
-
-@environmentfilter
-def do_attr(environment, obj, name):
-    """Get an attribute of an object.  ``foo|attr("bar")`` works like
-    ``foo.bar`` just that always an attribute is returned and items are not
-    looked up.
-
-    See :ref:`Notes on subscriptions <notes-on-subscriptions>` for more details.
-    """
-    try:
-        name = str(name)
-    except UnicodeError:
-        pass
-    else:
-        try:
-            value = getattr(obj, name)
-        except AttributeError:
-            pass
-        else:
-            if environment.sandboxed and not environment.is_safe_attribute(
-                obj, name, value
-            ):
-                return environment.unsafe_undefined(obj, name)
-            return value
-    return environment.undefined(obj=obj, name=name)
-
-
-@contextfilter
-def do_map(*args, **kwargs):
-    """Applies a filter on a sequence of objects or looks up an attribute.
-    This is useful when dealing with lists of objects but you are really
-    only interested in a certain value of it.
-
-    The basic usage is mapping on an attribute.  Imagine you have a list
-    of users but you are only interested in a list of usernames:
-
-    .. sourcecode:: jinja
-
-        Users on this page: {{ users|map(attribute='username')|join(', ') }}
-
-    You can specify a ``default`` value to use if an object in the list
-    does not have the given attribute.
-
-    .. sourcecode:: jinja
-
-        {{ users|map(attribute="username", default="Anonymous")|join(", ") }}
-
-    Alternatively you can let it invoke a filter by passing the name of the
-    filter and the arguments afterwards.  A good example would be applying a
-    text conversion filter on a sequence:
-
-    .. sourcecode:: jinja
-
-        Users on this page: {{ titles|map('lower')|join(', ') }}
-
-    Similar to a generator comprehension such as:
-
-    .. code-block:: python
-
-        (u.username for u in users)
-        (u.username or "Anonymous" for u in users)
-        (do_lower(x) for x in titles)
-
-    .. versionchanged:: 2.11.0
-        Added the ``default`` parameter.
-
-    .. versionadded:: 2.7
-    """
-    seq, func = prepare_map(args, kwargs)
-    if seq:
-        for item in seq:
-            yield func(item)
-
-
-@contextfilter
-def do_select(*args, **kwargs):
-    """Filters a sequence of objects by applying a test to each object,
-    and only selecting the objects with the test succeeding.
-
-    If no test is specified, each object will be evaluated as a boolean.
-
-    Example usage:
-
-    .. sourcecode:: jinja
-
-        {{ numbers|select("odd") }}
-        {{ numbers|select("odd") }}
-        {{ numbers|select("divisibleby", 3) }}
-        {{ numbers|select("lessthan", 42) }}
-        {{ strings|select("equalto", "mystring") }}
-
-    Similar to a generator comprehension such as:
-
-    .. code-block:: python
-
-        (n for n in numbers if test_odd(n))
-        (n for n in numbers if test_divisibleby(n, 3))
-
-    .. versionadded:: 2.7
-    """
-    return select_or_reject(args, kwargs, lambda x: x, False)
-
-
-@contextfilter
-def do_reject(*args, **kwargs):
-    """Filters a sequence of objects by applying a test to each object,
-    and rejecting the objects with the test succeeding.
-
-    If no test is specified, each object will be evaluated as a boolean.
-
-    Example usage:
-
-    .. sourcecode:: jinja
-
-        {{ numbers|reject("odd") }}
-
-    Similar to a generator comprehension such as:
-
-    .. code-block:: python
-
-        (n for n in numbers if not test_odd(n))
-
-    .. versionadded:: 2.7
-    """
-    return select_or_reject(args, kwargs, lambda x: not x, False)
-
-
-@contextfilter
-def do_selectattr(*args, **kwargs):
-    """Filters a sequence of objects by applying a test to the specified
-    attribute of each object, and only selecting the objects with the
-    test succeeding.
-
-    If no test is specified, the attribute's value will be evaluated as
-    a boolean.
-
-    Example usage:
-
-    .. sourcecode:: jinja
-
-        {{ users|selectattr("is_active") }}
-        {{ users|selectattr("email", "none") }}
-
-    Similar to a generator comprehension such as:
-
-    .. code-block:: python
-
-        (u for user in users if user.is_active)
-        (u for user in users if test_none(user.email))
-
-    .. versionadded:: 2.7
-    """
-    return select_or_reject(args, kwargs, lambda x: x, True)
-
-
-@contextfilter
-def do_rejectattr(*args, **kwargs):
-    """Filters a sequence of objects by applying a test to the specified
-    attribute of each object, and rejecting the objects with the test
-    succeeding.
-
-    If no test is specified, the attribute's value will be evaluated as
-    a boolean.
-
-    .. sourcecode:: jinja
-
-        {{ users|rejectattr("is_active") }}
-        {{ users|rejectattr("email", "none") }}
-
-    Similar to a generator comprehension such as:
-
-    .. code-block:: python
-
-        (u for user in users if not user.is_active)
-        (u for user in users if not test_none(user.email))
-
-    .. versionadded:: 2.7
-    """
-    return select_or_reject(args, kwargs, lambda x: not x, True)
-
-
-@evalcontextfilter
-def do_tojson(eval_ctx, value, indent=None):
-    """Dumps a structure to JSON so that it's safe to use in ``<script>``
-    tags.  It accepts the same arguments and returns a JSON string.  Note that
-    this is available in templates through the ``|tojson`` filter which will
-    also mark the result as safe.  Due to how this function escapes certain
-    characters this is safe even if used outside of ``<script>`` tags.
-
-    The following characters are escaped in strings:
-
-    -   ``<``
-    -   ``>``
-    -   ``&``
-    -   ``'``
-
-    This makes it safe to embed such strings in any place in HTML with the
-    notable exception of double quoted attributes.  In that case single
-    quote your attributes or HTML escape it in addition.
-
-    The indent parameter can be used to enable pretty printing.  Set it to
-    the number of spaces that the structures should be indented with.
-
-    Note that this filter is for use in HTML contexts only.
-
-    .. versionadded:: 2.9
-    """
-    policies = eval_ctx.environment.policies
-    dumper = policies["json.dumps_function"]
-    options = policies["json.dumps_kwargs"]
-    if indent is not None:
-        options = dict(options)
-        options["indent"] = indent
-    return htmlsafe_json_dumps(value, dumper=dumper, **options)
-
-
-def prepare_map(args, kwargs):
-    context = args[0]
-    seq = args[1]
-
-    if len(args) == 2 and "attribute" in kwargs:
-        attribute = kwargs.pop("attribute")
-        default = kwargs.pop("default", None)
-        if kwargs:
-            raise FilterArgumentError(
-                f"Unexpected keyword argument {next(iter(kwargs))!r}"
-            )
-        func = make_attrgetter(context.environment, attribute, default=default)
-    else:
-        try:
-            name = args[2]
-            args = args[3:]
-        except LookupError:
-            raise FilterArgumentError("map requires a filter argument")
-
-        def func(item):
-            return context.environment.call_filter(
-                name, item, args, kwargs, context=context
-            )
-
-    return seq, func
-
-
-def prepare_select_or_reject(args, kwargs, modfunc, lookup_attr):
-    context = args[0]
-    seq = args[1]
-    if lookup_attr:
-        try:
-            attr = args[2]
-        except LookupError:
-            raise FilterArgumentError("Missing parameter for attribute name")
-        transfunc = make_attrgetter(context.environment, attr)
-        off = 1
-    else:
-        off = 0
-
-        def transfunc(x):
-            return x
-
-    try:
-        name = args[2 + off]
-        args = args[3 + off :]
-
-        def func(item):
-            return context.environment.call_test(name, item, args, kwargs)
-
-    except LookupError:
-        func = bool
-
-    return seq, lambda item: modfunc(func(transfunc(item)))
-
-
-def select_or_reject(args, kwargs, modfunc, lookup_attr):
-    seq, func = prepare_select_or_reject(args, kwargs, modfunc, lookup_attr)
-    if seq:
-        for item in seq:
-            if func(item):
-                yield item
-
-
-FILTERS = {
-    "abs": abs,
-    "attr": do_attr,
-    "batch": do_batch,
-    "capitalize": do_capitalize,
-    "center": do_center,
-    "count": len,
-    "d": do_default,
-    "default": do_default,
-    "dictsort": do_dictsort,
-    "e": escape,
-    "escape": escape,
-    "filesizeformat": do_filesizeformat,
-    "first": do_first,
-    "float": do_float,
-    "forceescape": do_forceescape,
-    "format": do_format,
-    "groupby": do_groupby,
-    "indent": do_indent,
-    "int": do_int,
-    "join": do_join,
-    "last": do_last,
-    "length": len,
-    "list": do_list,
-    "lower": do_lower,
-    "map": do_map,
-    "min": do_min,
-    "max": do_max,
-    "pprint": do_pprint,
-    "random": do_random,
-    "reject": do_reject,
-    "rejectattr": do_rejectattr,
-    "replace": do_replace,
-    "reverse": do_reverse,
-    "round": do_round,
-    "safe": do_mark_safe,
-    "select": do_select,
-    "selectattr": do_selectattr,
-    "slice": do_slice,
-    "sort": do_sort,
-    "string": soft_str,
-    "striptags": do_striptags,
-    "sum": do_sum,
-    "title": do_title,
-    "trim": do_trim,
-    "truncate": do_truncate,
-    "unique": do_unique,
-    "upper": do_upper,
-    "urlencode": do_urlencode,
-    "urlize": do_urlize,
-    "wordcount": do_wordcount,
-    "wordwrap": do_wordwrap,
-    "xmlattr": do_xmlattr,
-    "tojson": do_tojson,
-}
diff --git a/src/jinja2/idtracking.py b/src/jinja2/idtracking.py
deleted file mode 100644
index 78cad916..00000000
--- a/src/jinja2/idtracking.py
+++ /dev/null
@@ -1,289 +0,0 @@
-from .visitor import NodeVisitor
-
-VAR_LOAD_PARAMETER = "param"
-VAR_LOAD_RESOLVE = "resolve"
-VAR_LOAD_ALIAS = "alias"
-VAR_LOAD_UNDEFINED = "undefined"
-
-
-def find_symbols(nodes, parent_symbols=None):
-    sym = Symbols(parent=parent_symbols)
-    visitor = FrameSymbolVisitor(sym)
-    for node in nodes:
-        visitor.visit(node)
-    return sym
-
-
-def symbols_for_node(node, parent_symbols=None):
-    sym = Symbols(parent=parent_symbols)
-    sym.analyze_node(node)
-    return sym
-
-
-class Symbols:
-    def __init__(self, parent=None, level=None):
-        if level is None:
-            if parent is None:
-                level = 0
-            else:
-                level = parent.level + 1
-        self.level = level
-        self.parent = parent
-        self.refs = {}
-        self.loads = {}
-        self.stores = set()
-
-    def analyze_node(self, node, **kwargs):
-        visitor = RootVisitor(self)
-        visitor.visit(node, **kwargs)
-
-    def _define_ref(self, name, load=None):
-        ident = f"l_{self.level}_{name}"
-        self.refs[name] = ident
-        if load is not None:
-            self.loads[ident] = load
-        return ident
-
-    def find_load(self, target):
-        if target in self.loads:
-            return self.loads[target]
-        if self.parent is not None:
-            return self.parent.find_load(target)
-
-    def find_ref(self, name):
-        if name in self.refs:
-            return self.refs[name]
-        if self.parent is not None:
-            return self.parent.find_ref(name)
-
-    def ref(self, name):
-        rv = self.find_ref(name)
-        if rv is None:
-            raise AssertionError(
-                "Tried to resolve a name to a reference that was"
-                f" unknown to the frame ({name!r})"
-            )
-        return rv
-
-    def copy(self):
-        rv = object.__new__(self.__class__)
-        rv.__dict__.update(self.__dict__)
-        rv.refs = self.refs.copy()
-        rv.loads = self.loads.copy()
-        rv.stores = self.stores.copy()
-        return rv
-
-    def store(self, name):
-        self.stores.add(name)
-
-        # If we have not see the name referenced yet, we need to figure
-        # out what to set it to.
-        if name not in self.refs:
-            # If there is a parent scope we check if the name has a
-            # reference there.  If it does it means we might have to alias
-            # to a variable there.
-            if self.parent is not None:
-                outer_ref = self.parent.find_ref(name)
-                if outer_ref is not None:
-                    self._define_ref(name, load=(VAR_LOAD_ALIAS, outer_ref))
-                    return
-
-            # Otherwise we can just set it to undefined.
-            self._define_ref(name, load=(VAR_LOAD_UNDEFINED, None))
-
-    def declare_parameter(self, name):
-        self.stores.add(name)
-        return self._define_ref(name, load=(VAR_LOAD_PARAMETER, None))
-
-    def load(self, name):
-        target = self.find_ref(name)
-        if target is None:
-            self._define_ref(name, load=(VAR_LOAD_RESOLVE, name))
-
-    def branch_update(self, branch_symbols):
-        stores = {}
-        for branch in branch_symbols:
-            for target in branch.stores:
-                if target in self.stores:
-                    continue
-                stores[target] = stores.get(target, 0) + 1
-
-        for sym in branch_symbols:
-            self.refs.update(sym.refs)
-            self.loads.update(sym.loads)
-            self.stores.update(sym.stores)
-
-        for name, branch_count in stores.items():
-            if branch_count == len(branch_symbols):
-                continue
-            target = self.find_ref(name)
-            assert target is not None, "should not happen"
-
-            if self.parent is not None:
-                outer_target = self.parent.find_ref(name)
-                if outer_target is not None:
-                    self.loads[target] = (VAR_LOAD_ALIAS, outer_target)
-                    continue
-            self.loads[target] = (VAR_LOAD_RESOLVE, name)
-
-    def dump_stores(self):
-        rv = {}
-        node = self
-        while node is not None:
-            for name in node.stores:
-                if name not in rv:
-                    rv[name] = self.find_ref(name)
-            node = node.parent
-        return rv
-
-    def dump_param_targets(self):
-        rv = set()
-        node = self
-        while node is not None:
-            for target, (instr, _) in self.loads.items():
-                if instr == VAR_LOAD_PARAMETER:
-                    rv.add(target)
-            node = node.parent
-        return rv
-
-
-class RootVisitor(NodeVisitor):
-    def __init__(self, symbols):
-        self.sym_visitor = FrameSymbolVisitor(symbols)
-
-    def _simple_visit(self, node, **kwargs):
-        for child in node.iter_child_nodes():
-            self.sym_visitor.visit(child)
-
-    visit_Template = (
-        visit_Block
-    ) = (
-        visit_Macro
-    ) = (
-        visit_FilterBlock
-    ) = visit_Scope = visit_If = visit_ScopedEvalContextModifier = _simple_visit
-
-    def visit_AssignBlock(self, node, **kwargs):
-        for child in node.body:
-            self.sym_visitor.visit(child)
-
-    def visit_CallBlock(self, node, **kwargs):
-        for child in node.iter_child_nodes(exclude=("call",)):
-            self.sym_visitor.visit(child)
-
-    def visit_OverlayScope(self, node, **kwargs):
-        for child in node.body:
-            self.sym_visitor.visit(child)
-
-    def visit_For(self, node, for_branch="body", **kwargs):
-        if for_branch == "body":
-            self.sym_visitor.visit(node.target, store_as_param=True)
-            branch = node.body
-        elif for_branch == "else":
-            branch = node.else_
-        elif for_branch == "test":
-            self.sym_visitor.visit(node.target, store_as_param=True)
-            if node.test is not None:
-                self.sym_visitor.visit(node.test)
-            return
-        else:
-            raise RuntimeError("Unknown for branch")
-        for item in branch or ():
-            self.sym_visitor.visit(item)
-
-    def visit_With(self, node, **kwargs):
-        for target in node.targets:
-            self.sym_visitor.visit(target)
-        for child in node.body:
-            self.sym_visitor.visit(child)
-
-    def generic_visit(self, node, *args, **kwargs):
-        raise NotImplementedError(
-            f"Cannot find symbols for {node.__class__.__name__!r}"
-        )
-
-
-class FrameSymbolVisitor(NodeVisitor):
-    """A visitor for `Frame.inspect`."""
-
-    def __init__(self, symbols):
-        self.symbols = symbols
-
-    def visit_Name(self, node, store_as_param=False, **kwargs):
-        """All assignments to names go through this function."""
-        if store_as_param or node.ctx == "param":
-            self.symbols.declare_parameter(node.name)
-        elif node.ctx == "store":
-            self.symbols.store(node.name)
-        elif node.ctx == "load":
-            self.symbols.load(node.name)
-
-    def visit_NSRef(self, node, **kwargs):
-        self.symbols.load(node.name)
-
-    def visit_If(self, node, **kwargs):
-        self.visit(node.test, **kwargs)
-
-        original_symbols = self.symbols
-
-        def inner_visit(nodes):
-            self.symbols = rv = original_symbols.copy()
-            for subnode in nodes:
-                self.visit(subnode, **kwargs)
-            self.symbols = original_symbols
-            return rv
-
-        body_symbols = inner_visit(node.body)
-        elif_symbols = inner_visit(node.elif_)
-        else_symbols = inner_visit(node.else_ or ())
-
-        self.symbols.branch_update([body_symbols, elif_symbols, else_symbols])
-
-    def visit_Macro(self, node, **kwargs):
-        self.symbols.store(node.name)
-
-    def visit_Import(self, node, **kwargs):
-        self.generic_visit(node, **kwargs)
-        self.symbols.store(node.target)
-
-    def visit_FromImport(self, node, **kwargs):
-        self.generic_visit(node, **kwargs)
-        for name in node.names:
-            if isinstance(name, tuple):
-                self.symbols.store(name[1])
-            else:
-                self.symbols.store(name)
-
-    def visit_Assign(self, node, **kwargs):
-        """Visit assignments in the correct order."""
-        self.visit(node.node, **kwargs)
-        self.visit(node.target, **kwargs)
-
-    def visit_For(self, node, **kwargs):
-        """Visiting stops at for blocks.  However the block sequence
-        is visited as part of the outer scope.
-        """
-        self.visit(node.iter, **kwargs)
-
-    def visit_CallBlock(self, node, **kwargs):
-        self.visit(node.call, **kwargs)
-
-    def visit_FilterBlock(self, node, **kwargs):
-        self.visit(node.filter, **kwargs)
-
-    def visit_With(self, node, **kwargs):
-        for target in node.values:
-            self.visit(target)
-
-    def visit_AssignBlock(self, node, **kwargs):
-        """Stop visiting at block assigns."""
-        self.visit(node.target, **kwargs)
-
-    def visit_Scope(self, node, **kwargs):
-        """Stop visiting at scopes."""
-
-    def visit_Block(self, node, **kwargs):
-        """Stop visiting at blocks."""
-
-    def visit_OverlayScope(self, node, **kwargs):
-        """Do not visit into overlay scopes."""
diff --git a/src/jinja2/lexer.py b/src/jinja2/lexer.py
deleted file mode 100644
index 082a051d..00000000
--- a/src/jinja2/lexer.py
+++ /dev/null
@@ -1,801 +0,0 @@
-"""Implements a Jinja / Python combination lexer. The ``Lexer`` class
-is used to do some preprocessing. It filters out invalid operators like
-the bitshift operators we don't allow in templates. It separates
-template code and python code in expressions.
-"""
-import re
-from ast import literal_eval
-from collections import deque
-from operator import itemgetter
-from sys import intern
-
-from ._identifier import pattern as name_re
-from .exceptions import TemplateSyntaxError
-from .utils import LRUCache
-
-# cache for the lexers. Exists in order to be able to have multiple
-# environments with the same lexer
-_lexer_cache = LRUCache(50)
-
-# static regular expressions
-whitespace_re = re.compile(r"\s+")
-newline_re = re.compile(r"(\r\n|\r|\n)")
-string_re = re.compile(
-    r"('([^'\\]*(?:\\.[^'\\]*)*)'" r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S
-)
-integer_re = re.compile(r"(\d+_)*\d+")
-float_re = re.compile(
-    r"""
-    (?<!\.)  # doesn't start with a .
-    (\d+_)*\d+  # digits, possibly _ separated
-    (
-        (\.(\d+_)*\d+)?  # optional fractional part
-        e[+\-]?(\d+_)*\d+  # exponent part
-    |
-        \.(\d+_)*\d+  # required fractional part
-    )
-    """,
-    re.IGNORECASE | re.VERBOSE,
-)
-
-# internal the tokens and keep references to them
-TOKEN_ADD = intern("add")
-TOKEN_ASSIGN = intern("assign")
-TOKEN_COLON = intern("colon")
-TOKEN_COMMA = intern("comma")
-TOKEN_DIV = intern("div")
-TOKEN_DOT = intern("dot")
-TOKEN_EQ = intern("eq")
-TOKEN_FLOORDIV = intern("floordiv")
-TOKEN_GT = intern("gt")
-TOKEN_GTEQ = intern("gteq")
-TOKEN_LBRACE = intern("lbrace")
-TOKEN_LBRACKET = intern("lbracket")
-TOKEN_LPAREN = intern("lparen")
-TOKEN_LT = intern("lt")
-TOKEN_LTEQ = intern("lteq")
-TOKEN_MOD = intern("mod")
-TOKEN_MUL = intern("mul")
-TOKEN_NE = intern("ne")
-TOKEN_PIPE = intern("pipe")
-TOKEN_POW = intern("pow")
-TOKEN_RBRACE = intern("rbrace")
-TOKEN_RBRACKET = intern("rbracket")
-TOKEN_RPAREN = intern("rparen")
-TOKEN_SEMICOLON = intern("semicolon")
-TOKEN_SUB = intern("sub")
-TOKEN_TILDE = intern("tilde")
-TOKEN_WHITESPACE = intern("whitespace")
-TOKEN_FLOAT = intern("float")
-TOKEN_INTEGER = intern("integer")
-TOKEN_NAME = intern("name")
-TOKEN_STRING = intern("string")
-TOKEN_OPERATOR = intern("operator")
-TOKEN_BLOCK_BEGIN = intern("block_begin")
-TOKEN_BLOCK_END = intern("block_end")
-TOKEN_VARIABLE_BEGIN = intern("variable_begin")
-TOKEN_VARIABLE_END = intern("variable_end")
-TOKEN_RAW_BEGIN = intern("raw_begin")
-TOKEN_RAW_END = intern("raw_end")
-TOKEN_COMMENT_BEGIN = intern("comment_begin")
-TOKEN_COMMENT_END = intern("comment_end")
-TOKEN_COMMENT = intern("comment")
-TOKEN_LINESTATEMENT_BEGIN = intern("linestatement_begin")
-TOKEN_LINESTATEMENT_END = intern("linestatement_end")
-TOKEN_LINECOMMENT_BEGIN = intern("linecomment_begin")
-TOKEN_LINECOMMENT_END = intern("linecomment_end")
-TOKEN_LINECOMMENT = intern("linecomment")
-TOKEN_DATA = intern("data")
-TOKEN_INITIAL = intern("initial")
-TOKEN_EOF = intern("eof")
-
-# bind operators to token types
-operators = {
-    "+": TOKEN_ADD,
-    "-": TOKEN_SUB,
-    "/": TOKEN_DIV,
-    "//": TOKEN_FLOORDIV,
-    "*": TOKEN_MUL,
-    "%": TOKEN_MOD,
-    "**": TOKEN_POW,
-    "~": TOKEN_TILDE,
-    "[": TOKEN_LBRACKET,
-    "]": TOKEN_RBRACKET,
-    "(": TOKEN_LPAREN,
-    ")": TOKEN_RPAREN,
-    "{": TOKEN_LBRACE,
-    "}": TOKEN_RBRACE,
-    "==": TOKEN_EQ,
-    "!=": TOKEN_NE,
-    ">": TOKEN_GT,
-    ">=": TOKEN_GTEQ,
-    "<": TOKEN_LT,
-    "<=": TOKEN_LTEQ,
-    "=": TOKEN_ASSIGN,
-    ".": TOKEN_DOT,
-    ":": TOKEN_COLON,
-    "|": TOKEN_PIPE,
-    ",": TOKEN_COMMA,
-    ";": TOKEN_SEMICOLON,
-}
-
-reverse_operators = {v: k for k, v in operators.items()}
-assert len(operators) == len(reverse_operators), "operators dropped"
-operator_re = re.compile(
-    f"({'|'.join(re.escape(x) for x in sorted(operators, key=lambda x: -len(x)))})"
-)
-
-ignored_tokens = frozenset(
-    [
-        TOKEN_COMMENT_BEGIN,
-        TOKEN_COMMENT,
-        TOKEN_COMMENT_END,
-        TOKEN_WHITESPACE,
-        TOKEN_LINECOMMENT_BEGIN,
-        TOKEN_LINECOMMENT_END,
-        TOKEN_LINECOMMENT,
-    ]
-)
-ignore_if_empty = frozenset(
-    [TOKEN_WHITESPACE, TOKEN_DATA, TOKEN_COMMENT, TOKEN_LINECOMMENT]
-)
-
-
-def _describe_token_type(token_type):
-    if token_type in reverse_operators:
-        return reverse_operators[token_type]
-    return {
-        TOKEN_COMMENT_BEGIN: "begin of comment",
-        TOKEN_COMMENT_END: "end of comment",
-        TOKEN_COMMENT: "comment",
-        TOKEN_LINECOMMENT: "comment",
-        TOKEN_BLOCK_BEGIN: "begin of statement block",
-        TOKEN_BLOCK_END: "end of statement block",
-        TOKEN_VARIABLE_BEGIN: "begin of print statement",
-        TOKEN_VARIABLE_END: "end of print statement",
-        TOKEN_LINESTATEMENT_BEGIN: "begin of line statement",
-        TOKEN_LINESTATEMENT_END: "end of line statement",
-        TOKEN_DATA: "template data / text",
-        TOKEN_EOF: "end of template",
-    }.get(token_type, token_type)
-
-
-def describe_token(token):
-    """Returns a description of the token."""
-    if token.type == TOKEN_NAME:
-        return token.value
-    return _describe_token_type(token.type)
-
-
-def describe_token_expr(expr):
-    """Like `describe_token` but for token expressions."""
-    if ":" in expr:
-        type, value = expr.split(":", 1)
-        if type == TOKEN_NAME:
-            return value
-    else:
-        type = expr
-    return _describe_token_type(type)
-
-
-def count_newlines(value):
-    """Count the number of newline characters in the string.  This is
-    useful for extensions that filter a stream.
-    """
-    return len(newline_re.findall(value))
-
-
-def compile_rules(environment):
-    """Compiles all the rules from the environment into a list of rules."""
-    e = re.escape
-    rules = [
-        (
-            len(environment.comment_start_string),
-            TOKEN_COMMENT_BEGIN,
-            e(environment.comment_start_string),
-        ),
-        (
-            len(environment.block_start_string),
-            TOKEN_BLOCK_BEGIN,
-            e(environment.block_start_string),
-        ),
-        (
-            len(environment.variable_start_string),
-            TOKEN_VARIABLE_BEGIN,
-            e(environment.variable_start_string),
-        ),
-    ]
-
-    if environment.line_statement_prefix is not None:
-        rules.append(
-            (
-                len(environment.line_statement_prefix),
-                TOKEN_LINESTATEMENT_BEGIN,
-                r"^[ \t\v]*" + e(environment.line_statement_prefix),
-            )
-        )
-    if environment.line_comment_prefix is not None:
-        rules.append(
-            (
-                len(environment.line_comment_prefix),
-                TOKEN_LINECOMMENT_BEGIN,
-                r"(?:^|(?<=\S))[^\S\r\n]*" + e(environment.line_comment_prefix),
-            )
-        )
-
-    return [x[1:] for x in sorted(rules, reverse=True)]
-
-
-class Failure:
-    """Class that raises a `TemplateSyntaxError` if called.
-    Used by the `Lexer` to specify known errors.
-    """
-
-    def __init__(self, message, cls=TemplateSyntaxError):
-        self.message = message
-        self.error_class = cls
-
-    def __call__(self, lineno, filename):
-        raise self.error_class(self.message, lineno, filename)
-
-
-class Token(tuple):
-    """Token class."""
-
-    __slots__ = ()
-    lineno, type, value = (property(itemgetter(x)) for x in range(3))
-
-    def __new__(cls, lineno, type, value):
-        return tuple.__new__(cls, (lineno, intern(str(type)), value))
-
-    def __str__(self):
-        if self.type in reverse_operators:
-            return reverse_operators[self.type]
-        elif self.type == "name":
-            return self.value
-        return self.type
-
-    def test(self, expr):
-        """Test a token against a token expression.  This can either be a
-        token type or ``'token_type:token_value'``.  This can only test
-        against string values and types.
-        """
-        # here we do a regular string equality check as test_any is usually
-        # passed an iterable of not interned strings.
-        if self.type == expr:
-            return True
-        elif ":" in expr:
-            return expr.split(":", 1) == [self.type, self.value]
-        return False
-
-    def test_any(self, *iterable):
-        """Test against multiple token expressions."""
-        for expr in iterable:
-            if self.test(expr):
-                return True
-        return False
-
-    def __repr__(self):
-        return f"Token({self.lineno!r}, {self.type!r}, {self.value!r})"
-
-
-class TokenStreamIterator:
-    """The iterator for tokenstreams.  Iterate over the stream
-    until the eof token is reached.
-    """
-
-    def __init__(self, stream):
-        self.stream = stream
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        token = self.stream.current
-        if token.type is TOKEN_EOF:
-            self.stream.close()
-            raise StopIteration()
-        next(self.stream)
-        return token
-
-
-class TokenStream:
-    """A token stream is an iterable that yields :class:`Token`\\s.  The
-    parser however does not iterate over it but calls :meth:`next` to go
-    one token ahead.  The current active token is stored as :attr:`current`.
-    """
-
-    def __init__(self, generator, name, filename):
-        self._iter = iter(generator)
-        self._pushed = deque()
-        self.name = name
-        self.filename = filename
-        self.closed = False
-        self.current = Token(1, TOKEN_INITIAL, "")
-        next(self)
-
-    def __iter__(self):
-        return TokenStreamIterator(self)
-
-    def __bool__(self):
-        return bool(self._pushed) or self.current.type is not TOKEN_EOF
-
-    __nonzero__ = __bool__  # py2
-
-    @property
-    def eos(self):
-        """Are we at the end of the stream?"""
-        return not self
-
-    def push(self, token):
-        """Push a token back to the stream."""
-        self._pushed.append(token)
-
-    def look(self):
-        """Look at the next token."""
-        old_token = next(self)
-        result = self.current
-        self.push(result)
-        self.current = old_token
-        return result
-
-    def skip(self, n=1):
-        """Got n tokens ahead."""
-        for _ in range(n):
-            next(self)
-
-    def next_if(self, expr):
-        """Perform the token test and return the token if it matched.
-        Otherwise the return value is `None`.
-        """
-        if self.current.test(expr):
-            return next(self)
-
-    def skip_if(self, expr):
-        """Like :meth:`next_if` but only returns `True` or `False`."""
-        return self.next_if(expr) is not None
-
-    def __next__(self):
-        """Go one token ahead and return the old one.
-
-        Use the built-in :func:`next` instead of calling this directly.
-        """
-        rv = self.current
-        if self._pushed:
-            self.current = self._pushed.popleft()
-        elif self.current.type is not TOKEN_EOF:
-            try:
-                self.current = next(self._iter)
-            except StopIteration:
-                self.close()
-        return rv
-
-    def close(self):
-        """Close the stream."""
-        self.current = Token(self.current.lineno, TOKEN_EOF, "")
-        self._iter = None
-        self.closed = True
-
-    def expect(self, expr):
-        """Expect a given token type and return it.  This accepts the same
-        argument as :meth:`jinja2.lexer.Token.test`.
-        """
-        if not self.current.test(expr):
-            expr = describe_token_expr(expr)
-            if self.current.type is TOKEN_EOF:
-                raise TemplateSyntaxError(
-                    f"unexpected end of template, expected {expr!r}.",
-                    self.current.lineno,
-                    self.name,
-                    self.filename,
-                )
-            raise TemplateSyntaxError(
-                f"expected token {expr!r}, got {describe_token(self.current)!r}",
-                self.current.lineno,
-                self.name,
-                self.filename,
-            )
-        try:
-            return self.current
-        finally:
-            next(self)
-
-
-def get_lexer(environment):
-    """Return a lexer which is probably cached."""
-    key = (
-        environment.block_start_string,
-        environment.block_end_string,
-        environment.variable_start_string,
-        environment.variable_end_string,
-        environment.comment_start_string,
-        environment.comment_end_string,
-        environment.line_statement_prefix,
-        environment.line_comment_prefix,
-        environment.trim_blocks,
-        environment.lstrip_blocks,
-        environment.newline_sequence,
-        environment.keep_trailing_newline,
-    )
-    lexer = _lexer_cache.get(key)
-    if lexer is None:
-        lexer = Lexer(environment)
-        _lexer_cache[key] = lexer
-    return lexer
-
-
-class OptionalLStrip(tuple):
-    """A special tuple for marking a point in the state that can have
-    lstrip applied.
-    """
-
-    __slots__ = ()
-
-    # Even though it looks like a no-op, creating instances fails
-    # without this.
-    def __new__(cls, *members, **kwargs):
-        return super().__new__(cls, members)
-
-
-class Lexer:
-    """Class that implements a lexer for a given environment. Automatically
-    created by the environment class, usually you don't have to do that.
-
-    Note that the lexer is not automatically bound to an environment.
-    Multiple environments can share the same lexer.
-    """
-
-    def __init__(self, environment):
-        # shortcuts
-        e = re.escape
-
-        def c(x):
-            return re.compile(x, re.M | re.S)
-
-        # lexing rules for tags
-        tag_rules = [
-            (whitespace_re, TOKEN_WHITESPACE, None),
-            (float_re, TOKEN_FLOAT, None),
-            (integer_re, TOKEN_INTEGER, None),
-            (name_re, TOKEN_NAME, None),
-            (string_re, TOKEN_STRING, None),
-            (operator_re, TOKEN_OPERATOR, None),
-        ]
-
-        # assemble the root lexing rule. because "|" is ungreedy
-        # we have to sort by length so that the lexer continues working
-        # as expected when we have parsing rules like <% for block and
-        # <%= for variables. (if someone wants asp like syntax)
-        # variables are just part of the rules if variable processing
-        # is required.
-        root_tag_rules = compile_rules(environment)
-
-        block_start_re = e(environment.block_start_string)
-        block_end_re = e(environment.block_end_string)
-        comment_end_re = e(environment.comment_end_string)
-        variable_end_re = e(environment.variable_end_string)
-
-        # block suffix if trimming is enabled
-        block_suffix_re = "\\n?" if environment.trim_blocks else ""
-
-        # If lstrip is enabled, it should not be applied if there is any
-        # non-whitespace between the newline and block.
-        self.lstrip_unless_re = c(r"[^ \t]") if environment.lstrip_blocks else None
-
-        self.newline_sequence = environment.newline_sequence
-        self.keep_trailing_newline = environment.keep_trailing_newline
-
-        root_raw_re = (
-            fr"(?P<raw_begin>{block_start_re}(\-|\+|)\s*raw\s*"
-            fr"(?:\-{block_end_re}\s*|{block_end_re}))"
-        )
-        root_parts_re = "|".join(
-            [root_raw_re] + [fr"(?P<{n}>{r}(\-|\+|))" for n, r in root_tag_rules]
-        )
-
-        # global lexing rules
-        self.rules = {
-            "root": [
-                # directives
-                (
-                    c(fr"(.*?)(?:{root_parts_re})"),
-                    OptionalLStrip(TOKEN_DATA, "#bygroup"),
-                    "#bygroup",
-                ),
-                # data
-                (c(".+"), TOKEN_DATA, None),
-            ],
-            # comments
-            TOKEN_COMMENT_BEGIN: [
-                (
-                    c(
-                        fr"(.*?)((?:\+{comment_end_re}|\-{comment_end_re}\s*"
-                        fr"|{comment_end_re}{block_suffix_re}))"
-                    ),
-                    (TOKEN_COMMENT, TOKEN_COMMENT_END),
-                    "#pop",
-                ),
-                (c(r"(.)"), (Failure("Missing end of comment tag"),), None),
-            ],
-            # blocks
-            TOKEN_BLOCK_BEGIN: [
-                (
-                    c(
-                        fr"(?:\+{block_end_re}|\-{block_end_re}\s*"
-                        fr"|{block_end_re}{block_suffix_re})"
-                    ),
-                    TOKEN_BLOCK_END,
-                    "#pop",
-                ),
-            ]
-            + tag_rules,
-            # variables
-            TOKEN_VARIABLE_BEGIN: [
-                (
-                    c(fr"\-{variable_end_re}\s*|{variable_end_re}"),
-                    TOKEN_VARIABLE_END,
-                    "#pop",
-                )
-            ]
-            + tag_rules,
-            # raw block
-            TOKEN_RAW_BEGIN: [
-                (
-                    c(
-                        fr"(.*?)((?:{block_start_re}(\-|\+|))\s*endraw\s*"
-                        fr"(?:\+{block_end_re}|\-{block_end_re}\s*"
-                        fr"|{block_end_re}{block_suffix_re}))"
-                    ),
-                    OptionalLStrip(TOKEN_DATA, TOKEN_RAW_END),
-                    "#pop",
-                ),
-                (c(r"(.)"), (Failure("Missing end of raw directive"),), None),
-            ],
-            # line statements
-            TOKEN_LINESTATEMENT_BEGIN: [
-                (c(r"\s*(\n|$)"), TOKEN_LINESTATEMENT_END, "#pop")
-            ]
-            + tag_rules,
-            # line comments
-            TOKEN_LINECOMMENT_BEGIN: [
-                (
-                    c(r"(.*?)()(?=\n|$)"),
-                    (TOKEN_LINECOMMENT, TOKEN_LINECOMMENT_END),
-                    "#pop",
-                )
-            ],
-        }
-
-    def _normalize_newlines(self, value):
-        """Replace all newlines with the configured sequence in strings
-        and template data.
-        """
-        return newline_re.sub(self.newline_sequence, value)
-
-    def tokenize(self, source, name=None, filename=None, state=None):
-        """Calls tokeniter + tokenize and wraps it in a token stream."""
-        stream = self.tokeniter(source, name, filename, state)
-        return TokenStream(self.wrap(stream, name, filename), name, filename)
-
-    def wrap(self, stream, name=None, filename=None):
-        """This is called with the stream as returned by `tokenize` and wraps
-        every token in a :class:`Token` and converts the value.
-        """
-        for lineno, token, value in stream:
-            if token in ignored_tokens:
-                continue
-            elif token == TOKEN_LINESTATEMENT_BEGIN:
-                token = TOKEN_BLOCK_BEGIN
-            elif token == TOKEN_LINESTATEMENT_END:
-                token = TOKEN_BLOCK_END
-            # we are not interested in those tokens in the parser
-            elif token in (TOKEN_RAW_BEGIN, TOKEN_RAW_END):
-                continue
-            elif token == TOKEN_DATA:
-                value = self._normalize_newlines(value)
-            elif token == "keyword":
-                token = value
-            elif token == TOKEN_NAME:
-                value = str(value)
-                if not value.isidentifier():
-                    raise TemplateSyntaxError(
-                        "Invalid character in identifier", lineno, name, filename
-                    )
-            elif token == TOKEN_STRING:
-                # try to unescape string
-                try:
-                    value = (
-                        self._normalize_newlines(value[1:-1])
-                        .encode("ascii", "backslashreplace")
-                        .decode("unicode-escape")
-                    )
-                except Exception as e:
-                    msg = str(e).split(":")[-1].strip()
-                    raise TemplateSyntaxError(msg, lineno, name, filename)
-            elif token == TOKEN_INTEGER:
-                value = int(value.replace("_", ""))
-            elif token == TOKEN_FLOAT:
-                # remove all "_" first to support more Python versions
-                value = literal_eval(value.replace("_", ""))
-            elif token == TOKEN_OPERATOR:
-                token = operators[value]
-            yield Token(lineno, token, value)
-
-    def tokeniter(self, source, name, filename=None, state=None):
-        """This method tokenizes the text and returns the tokens in a
-        generator.  Use this method if you just want to tokenize a template.
-        """
-        lines = source.splitlines()
-        if self.keep_trailing_newline and source:
-            if source.endswith(("\r\n", "\r", "\n")):
-                lines.append("")
-        source = "\n".join(lines)
-        pos = 0
-        lineno = 1
-        stack = ["root"]
-        if state is not None and state != "root":
-            assert state in ("variable", "block"), "invalid state"
-            stack.append(state + "_begin")
-        statetokens = self.rules[stack[-1]]
-        source_length = len(source)
-        balancing_stack = []
-        lstrip_unless_re = self.lstrip_unless_re
-        newlines_stripped = 0
-        line_starting = True
-
-        while 1:
-            # tokenizer loop
-            for regex, tokens, new_state in statetokens:
-                m = regex.match(source, pos)
-                # if no match we try again with the next rule
-                if m is None:
-                    continue
-
-                # we only match blocks and variables if braces / parentheses
-                # are balanced. continue parsing with the lower rule which
-                # is the operator rule. do this only if the end tags look
-                # like operators
-                if balancing_stack and tokens in (
-                    TOKEN_VARIABLE_END,
-                    TOKEN_BLOCK_END,
-                    TOKEN_LINESTATEMENT_END,
-                ):
-                    continue
-
-                # tuples support more options
-                if isinstance(tokens, tuple):
-                    groups = m.groups()
-
-                    if isinstance(tokens, OptionalLStrip):
-                        # Rule supports lstrip. Match will look like
-                        # text, block type, whitespace control, type, control, ...
-                        text = groups[0]
-
-                        # Skipping the text and first type, every other group is the
-                        # whitespace control for each type. One of the groups will be
-                        # -, +, or empty string instead of None.
-                        strip_sign = next(g for g in groups[2::2] if g is not None)
-
-                        if strip_sign == "-":
-                            # Strip all whitespace between the text and the tag.
-                            stripped = text.rstrip()
-                            newlines_stripped = text[len(stripped) :].count("\n")
-                            groups = (stripped,) + groups[1:]
-                        elif (
-                            # Not marked for preserving whitespace.
-                            strip_sign != "+"
-                            # lstrip is enabled.
-                            and lstrip_unless_re is not None
-                            # Not a variable expression.
-                            and not m.groupdict().get(TOKEN_VARIABLE_BEGIN)
-                        ):
-                            # The start of text between the last newline and the tag.
-                            l_pos = text.rfind("\n") + 1
-                            if l_pos > 0 or line_starting:
-                                # If there's only whitespace between the newline and the
-                                # tag, strip it.
-                                if not lstrip_unless_re.search(text, l_pos):
-                                    groups = (text[:l_pos],) + groups[1:]
-
-                    for idx, token in enumerate(tokens):
-                        # failure group
-                        if token.__class__ is Failure:
-                            raise token(lineno, filename)
-                        # bygroup is a bit more complex, in that case we
-                        # yield for the current token the first named
-                        # group that matched
-                        elif token == "#bygroup":
-                            for key, value in m.groupdict().items():
-                                if value is not None:
-                                    yield lineno, key, value
-                                    lineno += value.count("\n")
-                                    break
-                            else:
-                                raise RuntimeError(
-                                    f"{regex!r} wanted to resolve the token dynamically"
-                                    " but no group matched"
-                                )
-                        # normal group
-                        else:
-                            data = groups[idx]
-                            if data or token not in ignore_if_empty:
-                                yield lineno, token, data
-                            lineno += data.count("\n") + newlines_stripped
-                            newlines_stripped = 0
-
-                # strings as token just are yielded as it.
-                else:
-                    data = m.group()
-                    # update brace/parentheses balance
-                    if tokens == TOKEN_OPERATOR:
-                        if data == "{":
-                            balancing_stack.append("}")
-                        elif data == "(":
-                            balancing_stack.append(")")
-                        elif data == "[":
-                            balancing_stack.append("]")
-                        elif data in ("}", ")", "]"):
-                            if not balancing_stack:
-                                raise TemplateSyntaxError(
-                                    f"unexpected '{data}'", lineno, name, filename
-                                )
-                            expected_op = balancing_stack.pop()
-                            if expected_op != data:
-                                raise TemplateSyntaxError(
-                                    f"unexpected '{data}', expected '{expected_op}'",
-                                    lineno,
-                                    name,
-                                    filename,
-                                )
-                    # yield items
-                    if data or tokens not in ignore_if_empty:
-                        yield lineno, tokens, data
-                    lineno += data.count("\n")
-
-                line_starting = m.group()[-1:] == "\n"
-
-                # fetch new position into new variable so that we can check
-                # if there is a internal parsing error which would result
-                # in an infinite loop
-                pos2 = m.end()
-
-                # handle state changes
-                if new_state is not None:
-                    # remove the uppermost state
-                    if new_state == "#pop":
-                        stack.pop()
-                    # resolve the new state by group checking
-                    elif new_state == "#bygroup":
-                        for key, value in m.groupdict().items():
-                            if value is not None:
-                                stack.append(key)
-                                break
-                        else:
-                            raise RuntimeError(
-                                f"{regex!r} wanted to resolve the new state dynamically"
-                                f" but no group matched"
-                            )
-                    # direct state name given
-                    else:
-                        stack.append(new_state)
-                    statetokens = self.rules[stack[-1]]
-                # we are still at the same position and no stack change.
-                # this means a loop without break condition, avoid that and
-                # raise error
-                elif pos2 == pos:
-                    raise RuntimeError(
-                        f"{regex!r} yielded empty string without stack change"
-                    )
-                # publish new function and start again
-                pos = pos2
-                break
-            # if loop terminated without break we haven't found a single match
-            # either we are at the end of the file or we have a problem
-            else:
-                # end of text
-                if pos >= source_length:
-                    return
-                # something went wrong
-                raise TemplateSyntaxError(
-                    f"unexpected char {source[pos]!r} at {pos}", lineno, name, filename
-                )
diff --git a/src/jinja2/loaders.py b/src/jinja2/loaders.py
deleted file mode 100644
index 6b71b835..00000000
--- a/src/jinja2/loaders.py
+++ /dev/null
@@ -1,566 +0,0 @@
-"""API and implementations for loading templates from different data
-sources.
-"""
-import importlib.util
-import os
-import sys
-import weakref
-import zipimport
-from collections import abc
-from hashlib import sha1
-from importlib import import_module
-from types import ModuleType
-
-from .exceptions import TemplateNotFound
-from .utils import internalcode
-from .utils import open_if_exists
-
-
-def split_template_path(template):
-    """Split a path into segments and perform a sanity check.  If it detects
-    '..' in the path it will raise a `TemplateNotFound` error.
-    """
-    pieces = []
-    for piece in template.split("/"):
-        if (
-            os.path.sep in piece
-            or (os.path.altsep and os.path.altsep in piece)
-            or piece == os.path.pardir
-        ):
-            raise TemplateNotFound(template)
-        elif piece and piece != ".":
-            pieces.append(piece)
-    return pieces
-
-
-class BaseLoader:
-    """Baseclass for all loaders.  Subclass this and override `get_source` to
-    implement a custom loading mechanism.  The environment provides a
-    `get_template` method that calls the loader's `load` method to get the
-    :class:`Template` object.
-
-    A very basic example for a loader that looks up templates on the file
-    system could look like this::
-
-        from jinja2 import BaseLoader, TemplateNotFound
-        from os.path import join, exists, getmtime
-
-        class MyLoader(BaseLoader):
-
-            def __init__(self, path):
-                self.path = path
-
-            def get_source(self, environment, template):
-                path = join(self.path, template)
-                if not exists(path):
-                    raise TemplateNotFound(template)
-                mtime = getmtime(path)
-                with open(path) as f:
-                    source = f.read()
-                return source, path, lambda: mtime == getmtime(path)
-    """
-
-    #: if set to `False` it indicates that the loader cannot provide access
-    #: to the source of templates.
-    #:
-    #: .. versionadded:: 2.4
-    has_source_access = True
-
-    def get_source(self, environment, template):
-        """Get the template source, filename and reload helper for a template.
-        It's passed the environment and template name and has to return a
-        tuple in the form ``(source, filename, uptodate)`` or raise a
-        `TemplateNotFound` error if it can't locate the template.
-
-        The source part of the returned tuple must be the source of the
-        template as a string. The filename should be the name of the
-        file on the filesystem if it was loaded from there, otherwise
-        ``None``. The filename is used by Python for the tracebacks
-        if no loader extension is used.
-
-        The last item in the tuple is the `uptodate` function.  If auto
-        reloading is enabled it's always called to check if the template
-        changed.  No arguments are passed so the function must store the
-        old state somewhere (for example in a closure).  If it returns `False`
-        the template will be reloaded.
-        """
-        if not self.has_source_access:
-            raise RuntimeError(
-                f"{self.__class__.__name__} cannot provide access to the source"
-            )
-        raise TemplateNotFound(template)
-
-    def list_templates(self):
-        """Iterates over all templates.  If the loader does not support that
-        it should raise a :exc:`TypeError` which is the default behavior.
-        """
-        raise TypeError("this loader cannot iterate over all templates")
-
-    @internalcode
-    def load(self, environment, name, globals=None):
-        """Loads a template.  This method looks up the template in the cache
-        or loads one by calling :meth:`get_source`.  Subclasses should not
-        override this method as loaders working on collections of other
-        loaders (such as :class:`PrefixLoader` or :class:`ChoiceLoader`)
-        will not call this method but `get_source` directly.
-        """
-        code = None
-        if globals is None:
-            globals = {}
-
-        # first we try to get the source for this template together
-        # with the filename and the uptodate function.
-        source, filename, uptodate = self.get_source(environment, name)
-
-        # try to load the code from the bytecode cache if there is a
-        # bytecode cache configured.
-        bcc = environment.bytecode_cache
-        if bcc is not None:
-            bucket = bcc.get_bucket(environment, name, filename, source)
-            code = bucket.code
-
-        # if we don't have code so far (not cached, no longer up to
-        # date) etc. we compile the template
-        if code is None:
-            code = environment.compile(source, name, filename)
-
-        # if the bytecode cache is available and the bucket doesn't
-        # have a code so far, we give the bucket the new code and put
-        # it back to the bytecode cache.
-        if bcc is not None and bucket.code is None:
-            bucket.code = code
-            bcc.set_bucket(bucket)
-
-        return environment.template_class.from_code(
-            environment, code, globals, uptodate
-        )
-
-
-class FileSystemLoader(BaseLoader):
-    """Load templates from a directory in the file system.
-
-    The path can be relative or absolute. Relative paths are relative to
-    the current working directory.
-
-    .. code-block:: python
-
-        loader = FileSystemLoader("templates")
-
-    A list of paths can be given. The directories will be searched in
-    order, stopping at the first matching template.
-
-    .. code-block:: python
-
-        loader = FileSystemLoader(["/override/templates", "/default/templates"])
-
-    :param searchpath: A path, or list of paths, to the directory that
-        contains the templates.
-    :param encoding: Use this encoding to read the text from template
-        files.
-    :param followlinks: Follow symbolic links in the path.
-
-    .. versionchanged:: 2.8
-        Added the ``followlinks`` parameter.
-    """
-
-    def __init__(self, searchpath, encoding="utf-8", followlinks=False):
-        if not isinstance(searchpath, abc.Iterable) or isinstance(searchpath, str):
-            searchpath = [searchpath]
-
-        self.searchpath = list(searchpath)
-        self.encoding = encoding
-        self.followlinks = followlinks
-
-    def get_source(self, environment, template):
-        pieces = split_template_path(template)
-        for searchpath in self.searchpath:
-            filename = os.path.join(searchpath, *pieces)
-            f = open_if_exists(filename)
-            if f is None:
-                continue
-            try:
-                contents = f.read().decode(self.encoding)
-            finally:
-                f.close()
-
-            mtime = os.path.getmtime(filename)
-
-            def uptodate():
-                try:
-                    return os.path.getmtime(filename) == mtime
-                except OSError:
-                    return False
-
-            return contents, filename, uptodate
-        raise TemplateNotFound(template)
-
-    def list_templates(self):
-        found = set()
-        for searchpath in self.searchpath:
-            walk_dir = os.walk(searchpath, followlinks=self.followlinks)
-            for dirpath, _, filenames in walk_dir:
-                for filename in filenames:
-                    template = (
-                        os.path.join(dirpath, filename)[len(searchpath) :]
-                        .strip(os.path.sep)
-                        .replace(os.path.sep, "/")
-                    )
-                    if template[:2] == "./":
-                        template = template[2:]
-                    if template not in found:
-                        found.add(template)
-        return sorted(found)
-
-
-class PackageLoader(BaseLoader):
-    """Load templates from a directory in a Python package.
-
-    :param package_name: Import name of the package that contains the
-        template directory.
-    :param package_path: Directory within the imported package that
-        contains the templates.
-    :param encoding: Encoding of template files.
-
-    The following example looks up templates in the ``pages`` directory
-    within the ``project.ui`` package.
-
-    .. code-block:: python
-
-        loader = PackageLoader("project.ui", "pages")
-
-    Only packages installed as directories (standard pip behavior) or
-    zip/egg files (less common) are supported. The Python API for
-    introspecting data in packages is too limited to support other
-    installation methods the way this loader requires.
-
-    There is limited support for :pep:`420` namespace packages. The
-    template directory is assumed to only be in one namespace
-    contributor. Zip files contributing to a namespace are not
-    supported.
-
-    .. versionchanged:: 3.0
-        No longer uses ``setuptools`` as a dependency.
-
-    .. versionchanged:: 3.0
-        Limited PEP 420 namespace package support.
-    """
-
-    def __init__(self, package_name, package_path="templates", encoding="utf-8"):
-        if package_path == os.path.curdir:
-            package_path = ""
-        elif package_path[:2] == os.path.curdir + os.path.sep:
-            package_path = package_path[2:]
-
-        package_path = os.path.normpath(package_path).rstrip(os.path.sep)
-        self.package_path = package_path
-        self.package_name = package_name
-        self.encoding = encoding
-
-        # Make sure the package exists. This also makes namespace
-        # packages work, otherwise get_loader returns None.
-        import_module(package_name)
-        spec = importlib.util.find_spec(package_name)
-        self._loader = loader = spec.loader
-        self._archive = None
-        self._template_root = None
-
-        if isinstance(loader, zipimport.zipimporter):
-            self._archive = loader.archive
-            pkgdir = next(iter(spec.submodule_search_locations))
-            self._template_root = os.path.join(pkgdir, package_path)
-        elif spec.submodule_search_locations:
-            # This will be one element for regular packages and multiple
-            # for namespace packages.
-            for root in spec.submodule_search_locations:
-                root = os.path.join(root, package_path)
-
-                if os.path.isdir(root):
-                    self._template_root = root
-                    break
-
-        if self._template_root is None:
-            raise ValueError(
-                f"The {package_name!r} package was not installed in a"
-                " way that PackageLoader understands."
-            )
-
-    def get_source(self, environment, template):
-        p = os.path.join(self._template_root, *split_template_path(template))
-
-        if self._archive is None:
-            # Package is a directory.
-            if not os.path.isfile(p):
-                raise TemplateNotFound(template)
-
-            with open(p, "rb") as f:
-                source = f.read()
-
-            mtime = os.path.getmtime(p)
-
-            def up_to_date():
-                return os.path.isfile(p) and os.path.getmtime(p) == mtime
-
-        else:
-            # Package is a zip file.
-            try:
-                source = self._loader.get_data(p)
-            except OSError:
-                raise TemplateNotFound(template)
-
-            # Could use the zip's mtime for all template mtimes, but
-            # would need to safely reload the module if it's out of
-            # date, so just report it as always current.
-            up_to_date = None
-
-        return source.decode(self.encoding), p, up_to_date
-
-    def list_templates(self):
-        results = []
-
-        if self._archive is None:
-            # Package is a directory.
-            offset = len(self._template_root)
-
-            for dirpath, _, filenames in os.walk(self._template_root):
-                dirpath = dirpath[offset:].lstrip(os.path.sep)
-                results.extend(
-                    os.path.join(dirpath, name).replace(os.path.sep, "/")
-                    for name in filenames
-                )
-        else:
-            if not hasattr(self._loader, "_files"):
-                raise TypeError(
-                    "This zip import does not have the required"
-                    " metadata to list templates."
-                )
-
-            # Package is a zip file.
-            prefix = (
-                self._template_root[len(self._archive) :].lstrip(os.path.sep)
-                + os.path.sep
-            )
-            offset = len(prefix)
-
-            for name in self._loader._files.keys():
-                # Find names under the templates directory that aren't directories.
-                if name.startswith(prefix) and name[-1] != os.path.sep:
-                    results.append(name[offset:].replace(os.path.sep, "/"))
-
-        results.sort()
-        return results
-
-
-class DictLoader(BaseLoader):
-    """Loads a template from a Python dict mapping template names to
-    template source.  This loader is useful for unittesting:
-
-    >>> loader = DictLoader({'index.html': 'source here'})
-
-    Because auto reloading is rarely useful this is disabled per default.
-    """
-
-    def __init__(self, mapping):
-        self.mapping = mapping
-
-    def get_source(self, environment, template):
-        if template in self.mapping:
-            source = self.mapping[template]
-            return source, None, lambda: source == self.mapping.get(template)
-        raise TemplateNotFound(template)
-
-    def list_templates(self):
-        return sorted(self.mapping)
-
-
-class FunctionLoader(BaseLoader):
-    """A loader that is passed a function which does the loading.  The
-    function receives the name of the template and has to return either
-    a string with the template source, a tuple in the form ``(source,
-    filename, uptodatefunc)`` or `None` if the template does not exist.
-
-    >>> def load_template(name):
-    ...     if name == 'index.html':
-    ...         return '...'
-    ...
-    >>> loader = FunctionLoader(load_template)
-
-    The `uptodatefunc` is a function that is called if autoreload is enabled
-    and has to return `True` if the template is still up to date.  For more
-    details have a look at :meth:`BaseLoader.get_source` which has the same
-    return value.
-    """
-
-    def __init__(self, load_func):
-        self.load_func = load_func
-
-    def get_source(self, environment, template):
-        rv = self.load_func(template)
-        if rv is None:
-            raise TemplateNotFound(template)
-        elif isinstance(rv, str):
-            return rv, None, None
-        return rv
-
-
-class PrefixLoader(BaseLoader):
-    """A loader that is passed a dict of loaders where each loader is bound
-    to a prefix.  The prefix is delimited from the template by a slash per
-    default, which can be changed by setting the `delimiter` argument to
-    something else::
-
-        loader = PrefixLoader({
-            'app1':     PackageLoader('mypackage.app1'),
-            'app2':     PackageLoader('mypackage.app2')
-        })
-
-    By loading ``'app1/index.html'`` the file from the app1 package is loaded,
-    by loading ``'app2/index.html'`` the file from the second.
-    """
-
-    def __init__(self, mapping, delimiter="/"):
-        self.mapping = mapping
-        self.delimiter = delimiter
-
-    def get_loader(self, template):
-        try:
-            prefix, name = template.split(self.delimiter, 1)
-            loader = self.mapping[prefix]
-        except (ValueError, KeyError):
-            raise TemplateNotFound(template)
-        return loader, name
-
-    def get_source(self, environment, template):
-        loader, name = self.get_loader(template)
-        try:
-            return loader.get_source(environment, name)
-        except TemplateNotFound:
-            # re-raise the exception with the correct filename here.
-            # (the one that includes the prefix)
-            raise TemplateNotFound(template)
-
-    @internalcode
-    def load(self, environment, name, globals=None):
-        loader, local_name = self.get_loader(name)
-        try:
-            return loader.load(environment, local_name, globals)
-        except TemplateNotFound:
-            # re-raise the exception with the correct filename here.
-            # (the one that includes the prefix)
-            raise TemplateNotFound(name)
-
-    def list_templates(self):
-        result = []
-        for prefix, loader in self.mapping.items():
-            for template in loader.list_templates():
-                result.append(prefix + self.delimiter + template)
-        return result
-
-
-class ChoiceLoader(BaseLoader):
-    """This loader works like the `PrefixLoader` just that no prefix is
-    specified.  If a template could not be found by one loader the next one
-    is tried.
-
-    >>> loader = ChoiceLoader([
-    ...     FileSystemLoader('/path/to/user/templates'),
-    ...     FileSystemLoader('/path/to/system/templates')
-    ... ])
-
-    This is useful if you want to allow users to override builtin templates
-    from a different location.
-    """
-
-    def __init__(self, loaders):
-        self.loaders = loaders
-
-    def get_source(self, environment, template):
-        for loader in self.loaders:
-            try:
-                return loader.get_source(environment, template)
-            except TemplateNotFound:
-                pass
-        raise TemplateNotFound(template)
-
-    @internalcode
-    def load(self, environment, name, globals=None):
-        for loader in self.loaders:
-            try:
-                return loader.load(environment, name, globals)
-            except TemplateNotFound:
-                pass
-        raise TemplateNotFound(name)
-
-    def list_templates(self):
-        found = set()
-        for loader in self.loaders:
-            found.update(loader.list_templates())
-        return sorted(found)
-
-
-class _TemplateModule(ModuleType):
-    """Like a normal module but with support for weak references"""
-
-
-class ModuleLoader(BaseLoader):
-    """This loader loads templates from precompiled templates.
-
-    Example usage:
-
-    >>> loader = ChoiceLoader([
-    ...     ModuleLoader('/path/to/compiled/templates'),
-    ...     FileSystemLoader('/path/to/templates')
-    ... ])
-
-    Templates can be precompiled with :meth:`Environment.compile_templates`.
-    """
-
-    has_source_access = False
-
-    def __init__(self, path):
-        package_name = f"_jinja2_module_templates_{id(self):x}"
-
-        # create a fake module that looks for the templates in the
-        # path given.
-        mod = _TemplateModule(package_name)
-
-        if not isinstance(path, abc.Iterable) or isinstance(path, str):
-            path = [path]
-
-        mod.__path__ = [os.fspath(p) for p in path]
-
-        sys.modules[package_name] = weakref.proxy(
-            mod, lambda x: sys.modules.pop(package_name, None)
-        )
-
-        # the only strong reference, the sys.modules entry is weak
-        # so that the garbage collector can remove it once the
-        # loader that created it goes out of business.
-        self.module = mod
-        self.package_name = package_name
-
-    @staticmethod
-    def get_template_key(name):
-        return "tmpl_" + sha1(name.encode("utf-8")).hexdigest()
-
-    @staticmethod
-    def get_module_filename(name):
-        return ModuleLoader.get_template_key(name) + ".py"
-
-    @internalcode
-    def load(self, environment, name, globals=None):
-        key = self.get_template_key(name)
-        module = f"{self.package_name}.{key}"
-        mod = getattr(self.module, module, None)
-        if mod is None:
-            try:
-                mod = __import__(module, None, None, ["root"])
-            except ImportError:
-                raise TemplateNotFound(name)
-
-            # remove the entry from sys.modules, we only want the attribute
-            # on the module object we have stored on the loader.
-            sys.modules.pop(module, None)
-
-        return environment.template_class.from_module_dict(
-            environment, mod.__dict__, globals
-        )
diff --git a/src/jinja2/meta.py b/src/jinja2/meta.py
deleted file mode 100644
index 899e179a..00000000
--- a/src/jinja2/meta.py
+++ /dev/null
@@ -1,98 +0,0 @@
-"""Functions that expose information about templates that might be
-interesting for introspection.
-"""
-from . import nodes
-from .compiler import CodeGenerator
-
-
-class TrackingCodeGenerator(CodeGenerator):
-    """We abuse the code generator for introspection."""
-
-    def __init__(self, environment):
-        CodeGenerator.__init__(self, environment, "<introspection>", "<introspection>")
-        self.undeclared_identifiers = set()
-
-    def write(self, x):
-        """Don't write."""
-
-    def enter_frame(self, frame):
-        """Remember all undeclared identifiers."""
-        CodeGenerator.enter_frame(self, frame)
-        for _, (action, param) in frame.symbols.loads.items():
-            if action == "resolve" and param not in self.environment.globals:
-                self.undeclared_identifiers.add(param)
-
-
-def find_undeclared_variables(ast):
-    """Returns a set of all variables in the AST that will be looked up from
-    the context at runtime.  Because at compile time it's not known which
-    variables will be used depending on the path the execution takes at
-    runtime, all variables are returned.
-
-    >>> from jinja2 import Environment, meta
-    >>> env = Environment()
-    >>> ast = env.parse('{% set foo = 42 %}{{ bar + foo }}')
-    >>> meta.find_undeclared_variables(ast) == {'bar'}
-    True
-
-    .. admonition:: Implementation
-
-       Internally the code generator is used for finding undeclared variables.
-       This is good to know because the code generator might raise a
-       :exc:`TemplateAssertionError` during compilation and as a matter of
-       fact this function can currently raise that exception as well.
-    """
-    codegen = TrackingCodeGenerator(ast.environment)
-    codegen.visit(ast)
-    return codegen.undeclared_identifiers
-
-
-def find_referenced_templates(ast):
-    """Finds all the referenced templates from the AST.  This will return an
-    iterator over all the hardcoded template extensions, inclusions and
-    imports.  If dynamic inheritance or inclusion is used, `None` will be
-    yielded.
-
-    >>> from jinja2 import Environment, meta
-    >>> env = Environment()
-    >>> ast = env.parse('{% extends "layout.html" %}{% include helper %}')
-    >>> list(meta.find_referenced_templates(ast))
-    ['layout.html', None]
-
-    This function is useful for dependency tracking.  For example if you want
-    to rebuild parts of the website after a layout template has changed.
-    """
-    for node in ast.find_all(
-        (nodes.Extends, nodes.FromImport, nodes.Import, nodes.Include)
-    ):
-        if not isinstance(node.template, nodes.Const):
-            # a tuple with some non consts in there
-            if isinstance(node.template, (nodes.Tuple, nodes.List)):
-                for template_name in node.template.items:
-                    # something const, only yield the strings and ignore
-                    # non-string consts that really just make no sense
-                    if isinstance(template_name, nodes.Const):
-                        if isinstance(template_name.value, str):
-                            yield template_name.value
-                    # something dynamic in there
-                    else:
-                        yield None
-            # something dynamic we don't know about here
-            else:
-                yield None
-            continue
-        # constant is a basestring, direct template name
-        if isinstance(node.template.value, str):
-            yield node.template.value
-        # a tuple or list (latter *should* not happen) made of consts,
-        # yield the consts that are strings.  We could warn here for
-        # non string values
-        elif isinstance(node, nodes.Include) and isinstance(
-            node.template.value, (tuple, list)
-        ):
-            for template_name in node.template.value:
-                if isinstance(template_name, str):
-                    yield template_name
-        # something else we don't care about, we could warn here
-        else:
-            yield None
diff --git a/src/jinja2/nativetypes.py b/src/jinja2/nativetypes.py
deleted file mode 100644
index 5ecf72b5..00000000
--- a/src/jinja2/nativetypes.py
+++ /dev/null
@@ -1,93 +0,0 @@
-from ast import literal_eval
-from itertools import chain
-from itertools import islice
-
-from . import nodes
-from .compiler import CodeGenerator
-from .compiler import has_safe_repr
-from .environment import Environment
-from .environment import Template
-
-
-def native_concat(nodes):
-    """Return a native Python type from the list of compiled nodes. If
-    the result is a single node, its value is returned. Otherwise, the
-    nodes are concatenated as strings. If the result can be parsed with
-    :func:`ast.literal_eval`, the parsed value is returned. Otherwise,
-    the string is returned.
-
-    :param nodes: Iterable of nodes to concatenate.
-    """
-    head = list(islice(nodes, 2))
-
-    if not head:
-        return None
-
-    if len(head) == 1:
-        raw = head[0]
-    else:
-        raw = "".join([str(v) for v in chain(head, nodes)])
-
-    try:
-        return literal_eval(raw)
-    except (ValueError, SyntaxError, MemoryError):
-        return raw
-
-
-class NativeCodeGenerator(CodeGenerator):
-    """A code generator which renders Python types by not adding
-    ``str()`` around output nodes.
-    """
-
-    @staticmethod
-    def _default_finalize(value):
-        return value
-
-    def _output_const_repr(self, group):
-        return repr("".join([str(v) for v in group]))
-
-    def _output_child_to_const(self, node, frame, finalize):
-        const = node.as_const(frame.eval_ctx)
-
-        if not has_safe_repr(const):
-            raise nodes.Impossible()
-
-        if isinstance(node, nodes.TemplateData):
-            return const
-
-        return finalize.const(const)
-
-    def _output_child_pre(self, node, frame, finalize):
-        if finalize.src is not None:
-            self.write(finalize.src)
-
-    def _output_child_post(self, node, frame, finalize):
-        if finalize.src is not None:
-            self.write(")")
-
-
-class NativeEnvironment(Environment):
-    """An environment that renders templates to native Python types."""
-
-    code_generator_class = NativeCodeGenerator
-
-
-class NativeTemplate(Template):
-    environment_class = NativeEnvironment
-
-    def render(self, *args, **kwargs):
-        """Render the template to produce a native Python type. If the
-        result is a single node, its value is returned. Otherwise, the
-        nodes are concatenated as strings. If the result can be parsed
-        with :func:`ast.literal_eval`, the parsed value is returned.
-        Otherwise, the string is returned.
-        """
-        vars = dict(*args, **kwargs)
-
-        try:
-            return native_concat(self.root_render_func(self.new_context(vars)))
-        except Exception:
-            return self.environment.handle_exception()
-
-
-NativeEnvironment.template_class = NativeTemplate
diff --git a/src/jinja2/nodes.py b/src/jinja2/nodes.py
deleted file mode 100644
index d5133f75..00000000
--- a/src/jinja2/nodes.py
+++ /dev/null
@@ -1,1052 +0,0 @@
-"""AST nodes generated by the parser for the compiler. Also provides
-some node tree helper functions used by the parser and compiler in order
-to normalize nodes.
-"""
-import operator
-from collections import deque
-
-from markupsafe import Markup
-
-_binop_to_func = {
-    "*": operator.mul,
-    "/": operator.truediv,
-    "//": operator.floordiv,
-    "**": operator.pow,
-    "%": operator.mod,
-    "+": operator.add,
-    "-": operator.sub,
-}
-
-_uaop_to_func = {
-    "not": operator.not_,
-    "+": operator.pos,
-    "-": operator.neg,
-}
-
-_cmpop_to_func = {
-    "eq": operator.eq,
-    "ne": operator.ne,
-    "gt": operator.gt,
-    "gteq": operator.ge,
-    "lt": operator.lt,
-    "lteq": operator.le,
-    "in": lambda a, b: a in b,
-    "notin": lambda a, b: a not in b,
-}
-
-
-class Impossible(Exception):
-    """Raised if the node could not perform a requested action."""
-
-
-class NodeType(type):
-    """A metaclass for nodes that handles the field and attribute
-    inheritance.  fields and attributes from the parent class are
-    automatically forwarded to the child."""
-
-    def __new__(mcs, name, bases, d):
-        for attr in "fields", "attributes":
-            storage = []
-            storage.extend(getattr(bases[0] if bases else object, attr, ()))
-            storage.extend(d.get(attr, ()))
-            assert len(bases) <= 1, "multiple inheritance not allowed"
-            assert len(storage) == len(set(storage)), "layout conflict"
-            d[attr] = tuple(storage)
-        d.setdefault("abstract", False)
-        return type.__new__(mcs, name, bases, d)
-
-
-class EvalContext:
-    """Holds evaluation time information.  Custom attributes can be attached
-    to it in extensions.
-    """
-
-    def __init__(self, environment, template_name=None):
-        self.environment = environment
-        if callable(environment.autoescape):
-            self.autoescape = environment.autoescape(template_name)
-        else:
-            self.autoescape = environment.autoescape
-        self.volatile = False
-
-    def save(self):
-        return self.__dict__.copy()
-
-    def revert(self, old):
-        self.__dict__.clear()
-        self.__dict__.update(old)
-
-
-def get_eval_context(node, ctx):
-    if ctx is None:
-        if node.environment is None:
-            raise RuntimeError(
-                "if no eval context is passed, the node must have an"
-                " attached environment."
-            )
-        return EvalContext(node.environment)
-    return ctx
-
-
-class Node(metaclass=NodeType):
-    """Baseclass for all Jinja nodes.  There are a number of nodes available
-    of different types.  There are four major types:
-
-    -   :class:`Stmt`: statements
-    -   :class:`Expr`: expressions
-    -   :class:`Helper`: helper nodes
-    -   :class:`Template`: the outermost wrapper node
-
-    All nodes have fields and attributes.  Fields may be other nodes, lists,
-    or arbitrary values.  Fields are passed to the constructor as regular
-    positional arguments, attributes as keyword arguments.  Each node has
-    two attributes: `lineno` (the line number of the node) and `environment`.
-    The `environment` attribute is set at the end of the parsing process for
-    all nodes automatically.
-    """
-
-    fields = ()
-    attributes = ("lineno", "environment")
-    abstract = True
-
-    def __init__(self, *fields, **attributes):
-        if self.abstract:
-            raise TypeError("abstract nodes are not instantiable")
-        if fields:
-            if len(fields) != len(self.fields):
-                if not self.fields:
-                    raise TypeError(f"{self.__class__.__name__!r} takes 0 arguments")
-                raise TypeError(
-                    f"{self.__class__.__name__!r} takes 0 or {len(self.fields)}"
-                    f" argument{'s' if len(self.fields) != 1 else ''}"
-                )
-            for name, arg in zip(self.fields, fields):
-                setattr(self, name, arg)
-        for attr in self.attributes:
-            setattr(self, attr, attributes.pop(attr, None))
-        if attributes:
-            raise TypeError(f"unknown attribute {next(iter(attributes))!r}")
-
-    def iter_fields(self, exclude=None, only=None):
-        """This method iterates over all fields that are defined and yields
-        ``(key, value)`` tuples.  Per default all fields are returned, but
-        it's possible to limit that to some fields by providing the `only`
-        parameter or to exclude some using the `exclude` parameter.  Both
-        should be sets or tuples of field names.
-        """
-        for name in self.fields:
-            if (
-                (exclude is only is None)
-                or (exclude is not None and name not in exclude)
-                or (only is not None and name in only)
-            ):
-                try:
-                    yield name, getattr(self, name)
-                except AttributeError:
-                    pass
-
-    def iter_child_nodes(self, exclude=None, only=None):
-        """Iterates over all direct child nodes of the node.  This iterates
-        over all fields and yields the values of they are nodes.  If the value
-        of a field is a list all the nodes in that list are returned.
-        """
-        for _, item in self.iter_fields(exclude, only):
-            if isinstance(item, list):
-                for n in item:
-                    if isinstance(n, Node):
-                        yield n
-            elif isinstance(item, Node):
-                yield item
-
-    def find(self, node_type):
-        """Find the first node of a given type.  If no such node exists the
-        return value is `None`.
-        """
-        for result in self.find_all(node_type):
-            return result
-
-    def find_all(self, node_type):
-        """Find all the nodes of a given type.  If the type is a tuple,
-        the check is performed for any of the tuple items.
-        """
-        for child in self.iter_child_nodes():
-            if isinstance(child, node_type):
-                yield child
-            yield from child.find_all(node_type)
-
-    def set_ctx(self, ctx):
-        """Reset the context of a node and all child nodes.  Per default the
-        parser will all generate nodes that have a 'load' context as it's the
-        most common one.  This method is used in the parser to set assignment
-        targets and other nodes to a store context.
-        """
-        todo = deque([self])
-        while todo:
-            node = todo.popleft()
-            if "ctx" in node.fields:
-                node.ctx = ctx
-            todo.extend(node.iter_child_nodes())
-        return self
-
-    def set_lineno(self, lineno, override=False):
-        """Set the line numbers of the node and children."""
-        todo = deque([self])
-        while todo:
-            node = todo.popleft()
-            if "lineno" in node.attributes:
-                if node.lineno is None or override:
-                    node.lineno = lineno
-            todo.extend(node.iter_child_nodes())
-        return self
-
-    def set_environment(self, environment):
-        """Set the environment for all nodes."""
-        todo = deque([self])
-        while todo:
-            node = todo.popleft()
-            node.environment = environment
-            todo.extend(node.iter_child_nodes())
-        return self
-
-    def __eq__(self, other):
-        if type(self) is not type(other):
-            return NotImplemented
-
-        return tuple(self.iter_fields()) == tuple(other.iter_fields())
-
-    def __hash__(self):
-        return hash(tuple(self.iter_fields()))
-
-    def __repr__(self):
-        args_str = ", ".join(f"{a}={getattr(self, a, None)!r}" for a in self.fields)
-        return f"{self.__class__.__name__}({args_str})"
-
-    def dump(self):
-        def _dump(node):
-            if not isinstance(node, Node):
-                buf.append(repr(node))
-                return
-
-            buf.append(f"nodes.{node.__class__.__name__}(")
-            if not node.fields:
-                buf.append(")")
-                return
-            for idx, field in enumerate(node.fields):
-                if idx:
-                    buf.append(", ")
-                value = getattr(node, field)
-                if isinstance(value, list):
-                    buf.append("[")
-                    for idx, item in enumerate(value):
-                        if idx:
-                            buf.append(", ")
-                        _dump(item)
-                    buf.append("]")
-                else:
-                    _dump(value)
-            buf.append(")")
-
-        buf = []
-        _dump(self)
-        return "".join(buf)
-
-
-class Stmt(Node):
-    """Base node for all statements."""
-
-    abstract = True
-
-
-class Helper(Node):
-    """Nodes that exist in a specific context only."""
-
-    abstract = True
-
-
-class Template(Node):
-    """Node that represents a template.  This must be the outermost node that
-    is passed to the compiler.
-    """
-
-    fields = ("body",)
-
-
-class Output(Stmt):
-    """A node that holds multiple expressions which are then printed out.
-    This is used both for the `print` statement and the regular template data.
-    """
-
-    fields = ("nodes",)
-
-
-class Extends(Stmt):
-    """Represents an extends statement."""
-
-    fields = ("template",)
-
-
-class For(Stmt):
-    """The for loop.  `target` is the target for the iteration (usually a
-    :class:`Name` or :class:`Tuple`), `iter` the iterable.  `body` is a list
-    of nodes that are used as loop-body, and `else_` a list of nodes for the
-    `else` block.  If no else node exists it has to be an empty list.
-
-    For filtered nodes an expression can be stored as `test`, otherwise `None`.
-    """
-
-    fields = ("target", "iter", "body", "else_", "test", "recursive")
-
-
-class If(Stmt):
-    """If `test` is true, `body` is rendered, else `else_`."""
-
-    fields = ("test", "body", "elif_", "else_")
-
-
-class Macro(Stmt):
-    """A macro definition.  `name` is the name of the macro, `args` a list of
-    arguments and `defaults` a list of defaults if there are any.  `body` is
-    a list of nodes for the macro body.
-    """
-
-    fields = ("name", "args", "defaults", "body")
-
-
-class CallBlock(Stmt):
-    """Like a macro without a name but a call instead.  `call` is called with
-    the unnamed macro as `caller` argument this node holds.
-    """
-
-    fields = ("call", "args", "defaults", "body")
-
-
-class FilterBlock(Stmt):
-    """Node for filter sections."""
-
-    fields = ("body", "filter")
-
-
-class With(Stmt):
-    """Specific node for with statements.  In older versions of Jinja the
-    with statement was implemented on the base of the `Scope` node instead.
-
-    .. versionadded:: 2.9.3
-    """
-
-    fields = ("targets", "values", "body")
-
-
-class Block(Stmt):
-    """A node that represents a block."""
-
-    fields = ("name", "body", "scoped")
-
-
-class Include(Stmt):
-    """A node that represents the include tag."""
-
-    fields = ("template", "with_context", "ignore_missing")
-
-
-class Import(Stmt):
-    """A node that represents the import tag."""
-
-    fields = ("template", "target", "with_context")
-
-
-class FromImport(Stmt):
-    """A node that represents the from import tag.  It's important to not
-    pass unsafe names to the name attribute.  The compiler translates the
-    attribute lookups directly into getattr calls and does *not* use the
-    subscript callback of the interface.  As exported variables may not
-    start with double underscores (which the parser asserts) this is not a
-    problem for regular Jinja code, but if this node is used in an extension
-    extra care must be taken.
-
-    The list of names may contain tuples if aliases are wanted.
-    """
-
-    fields = ("template", "names", "with_context")
-
-
-class ExprStmt(Stmt):
-    """A statement that evaluates an expression and discards the result."""
-
-    fields = ("node",)
-
-
-class Assign(Stmt):
-    """Assigns an expression to a target."""
-
-    fields = ("target", "node")
-
-
-class AssignBlock(Stmt):
-    """Assigns a block to a target."""
-
-    fields = ("target", "filter", "body")
-
-
-class Expr(Node):
-    """Baseclass for all expressions."""
-
-    abstract = True
-
-    def as_const(self, eval_ctx=None):
-        """Return the value of the expression as constant or raise
-        :exc:`Impossible` if this was not possible.
-
-        An :class:`EvalContext` can be provided, if none is given
-        a default context is created which requires the nodes to have
-        an attached environment.
-
-        .. versionchanged:: 2.4
-           the `eval_ctx` parameter was added.
-        """
-        raise Impossible()
-
-    def can_assign(self):
-        """Check if it's possible to assign something to this node."""
-        return False
-
-
-class BinExpr(Expr):
-    """Baseclass for all binary expressions."""
-
-    fields = ("left", "right")
-    operator = None
-    abstract = True
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        # intercepted operators cannot be folded at compile time
-        if (
-            self.environment.sandboxed
-            and self.operator in self.environment.intercepted_binops
-        ):
-            raise Impossible()
-        f = _binop_to_func[self.operator]
-        try:
-            return f(self.left.as_const(eval_ctx), self.right.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
-
-
-class UnaryExpr(Expr):
-    """Baseclass for all unary expressions."""
-
-    fields = ("node",)
-    operator = None
-    abstract = True
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        # intercepted operators cannot be folded at compile time
-        if (
-            self.environment.sandboxed
-            and self.operator in self.environment.intercepted_unops
-        ):
-            raise Impossible()
-        f = _uaop_to_func[self.operator]
-        try:
-            return f(self.node.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
-
-
-class Name(Expr):
-    """Looks up a name or stores a value in a name.
-    The `ctx` of the node can be one of the following values:
-
-    -   `store`: store a value in the name
-    -   `load`: load that name
-    -   `param`: like `store` but if the name was defined as function parameter.
-    """
-
-    fields = ("name", "ctx")
-
-    def can_assign(self):
-        return self.name not in ("true", "false", "none", "True", "False", "None")
-
-
-class NSRef(Expr):
-    """Reference to a namespace value assignment"""
-
-    fields = ("name", "attr")
-
-    def can_assign(self):
-        # We don't need any special checks here; NSRef assignments have a
-        # runtime check to ensure the target is a namespace object which will
-        # have been checked already as it is created using a normal assignment
-        # which goes through a `Name` node.
-        return True
-
-
-class Literal(Expr):
-    """Baseclass for literals."""
-
-    abstract = True
-
-
-class Const(Literal):
-    """All constant values.  The parser will return this node for simple
-    constants such as ``42`` or ``"foo"`` but it can be used to store more
-    complex values such as lists too.  Only constants with a safe
-    representation (objects where ``eval(repr(x)) == x`` is true).
-    """
-
-    fields = ("value",)
-
-    def as_const(self, eval_ctx=None):
-        return self.value
-
-    @classmethod
-    def from_untrusted(cls, value, lineno=None, environment=None):
-        """Return a const object if the value is representable as
-        constant value in the generated code, otherwise it will raise
-        an `Impossible` exception.
-        """
-        from .compiler import has_safe_repr
-
-        if not has_safe_repr(value):
-            raise Impossible()
-        return cls(value, lineno=lineno, environment=environment)
-
-
-class TemplateData(Literal):
-    """A constant template string."""
-
-    fields = ("data",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if eval_ctx.volatile:
-            raise Impossible()
-        if eval_ctx.autoescape:
-            return Markup(self.data)
-        return self.data
-
-
-class Tuple(Literal):
-    """For loop unpacking and some other things like multiple arguments
-    for subscripts.  Like for :class:`Name` `ctx` specifies if the tuple
-    is used for loading the names or storing.
-    """
-
-    fields = ("items", "ctx")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return tuple(x.as_const(eval_ctx) for x in self.items)
-
-    def can_assign(self):
-        for item in self.items:
-            if not item.can_assign():
-                return False
-        return True
-
-
-class List(Literal):
-    """Any list literal such as ``[1, 2, 3]``"""
-
-    fields = ("items",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return [x.as_const(eval_ctx) for x in self.items]
-
-
-class Dict(Literal):
-    """Any dict literal such as ``{1: 2, 3: 4}``.  The items must be a list of
-    :class:`Pair` nodes.
-    """
-
-    fields = ("items",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return dict(x.as_const(eval_ctx) for x in self.items)
-
-
-class Pair(Helper):
-    """A key, value pair for dicts."""
-
-    fields = ("key", "value")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return self.key.as_const(eval_ctx), self.value.as_const(eval_ctx)
-
-
-class Keyword(Helper):
-    """A key, value pair for keyword arguments where key is a string."""
-
-    fields = ("key", "value")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return self.key, self.value.as_const(eval_ctx)
-
-
-class CondExpr(Expr):
-    """A conditional expression (inline if expression).  (``{{
-    foo if bar else baz }}``)
-    """
-
-    fields = ("test", "expr1", "expr2")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if self.test.as_const(eval_ctx):
-            return self.expr1.as_const(eval_ctx)
-
-        # if we evaluate to an undefined object, we better do that at runtime
-        if self.expr2 is None:
-            raise Impossible()
-
-        return self.expr2.as_const(eval_ctx)
-
-
-def args_as_const(node, eval_ctx):
-    args = [x.as_const(eval_ctx) for x in node.args]
-    kwargs = dict(x.as_const(eval_ctx) for x in node.kwargs)
-
-    if node.dyn_args is not None:
-        try:
-            args.extend(node.dyn_args.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
-
-    if node.dyn_kwargs is not None:
-        try:
-            kwargs.update(node.dyn_kwargs.as_const(eval_ctx))
-        except Exception:
-            raise Impossible()
-
-    return args, kwargs
-
-
-class Filter(Expr):
-    """This node applies a filter on an expression.  `name` is the name of
-    the filter, the rest of the fields are the same as for :class:`Call`.
-
-    If the `node` of a filter is `None` the contents of the last buffer are
-    filtered.  Buffers are created by macros and filter blocks.
-    """
-
-    fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-
-        if eval_ctx.volatile or self.node is None:
-            raise Impossible()
-
-        filter_ = self.environment.filters.get(self.name)
-
-        if filter_ is None or getattr(filter_, "contextfilter", False) is True:
-            raise Impossible()
-
-        # We cannot constant handle async filters, so we need to make sure
-        # to not go down this path.
-        if eval_ctx.environment.is_async and getattr(
-            filter_, "asyncfiltervariant", False
-        ):
-            raise Impossible()
-
-        args, kwargs = args_as_const(self, eval_ctx)
-        args.insert(0, self.node.as_const(eval_ctx))
-
-        if getattr(filter_, "evalcontextfilter", False) is True:
-            args.insert(0, eval_ctx)
-        elif getattr(filter_, "environmentfilter", False) is True:
-            args.insert(0, self.environment)
-
-        try:
-            return filter_(*args, **kwargs)
-        except Exception:
-            raise Impossible()
-
-
-class Test(Expr):
-    """Applies a test on an expression.  `name` is the name of the test, the
-    rest of the fields are the same as for :class:`Call`.
-    """
-
-    fields = ("node", "name", "args", "kwargs", "dyn_args", "dyn_kwargs")
-
-    def as_const(self, eval_ctx=None):
-        test = self.environment.tests.get(self.name)
-
-        if test is None:
-            raise Impossible()
-
-        eval_ctx = get_eval_context(self, eval_ctx)
-        args, kwargs = args_as_const(self, eval_ctx)
-        args.insert(0, self.node.as_const(eval_ctx))
-
-        try:
-            return test(*args, **kwargs)
-        except Exception:
-            raise Impossible()
-
-
-class Call(Expr):
-    """Calls an expression.  `args` is a list of arguments, `kwargs` a list
-    of keyword arguments (list of :class:`Keyword` nodes), and `dyn_args`
-    and `dyn_kwargs` has to be either `None` or a node that is used as
-    node for dynamic positional (``*args``) or keyword (``**kwargs``)
-    arguments.
-    """
-
-    fields = ("node", "args", "kwargs", "dyn_args", "dyn_kwargs")
-
-
-class Getitem(Expr):
-    """Get an attribute or item from an expression and prefer the item."""
-
-    fields = ("node", "arg", "ctx")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if self.ctx != "load":
-            raise Impossible()
-        try:
-            return self.environment.getitem(
-                self.node.as_const(eval_ctx), self.arg.as_const(eval_ctx)
-            )
-        except Exception:
-            raise Impossible()
-
-    def can_assign(self):
-        return False
-
-
-class Getattr(Expr):
-    """Get an attribute or item from an expression that is a ascii-only
-    bytestring and prefer the attribute.
-    """
-
-    fields = ("node", "attr", "ctx")
-
-    def as_const(self, eval_ctx=None):
-        if self.ctx != "load":
-            raise Impossible()
-        try:
-            eval_ctx = get_eval_context(self, eval_ctx)
-            return self.environment.getattr(self.node.as_const(eval_ctx), self.attr)
-        except Exception:
-            raise Impossible()
-
-    def can_assign(self):
-        return False
-
-
-class Slice(Expr):
-    """Represents a slice object.  This must only be used as argument for
-    :class:`Subscript`.
-    """
-
-    fields = ("start", "stop", "step")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-
-        def const(obj):
-            if obj is None:
-                return None
-            return obj.as_const(eval_ctx)
-
-        return slice(const(self.start), const(self.stop), const(self.step))
-
-
-class Concat(Expr):
-    """Concatenates the list of expressions provided after converting
-    them to strings.
-    """
-
-    fields = ("nodes",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return "".join(str(x.as_const(eval_ctx)) for x in self.nodes)
-
-
-class Compare(Expr):
-    """Compares an expression with some other expressions.  `ops` must be a
-    list of :class:`Operand`\\s.
-    """
-
-    fields = ("expr", "ops")
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        result = value = self.expr.as_const(eval_ctx)
-
-        try:
-            for op in self.ops:
-                new_value = op.expr.as_const(eval_ctx)
-                result = _cmpop_to_func[op.op](value, new_value)
-
-                if not result:
-                    return False
-
-                value = new_value
-        except Exception:
-            raise Impossible()
-
-        return result
-
-
-class Operand(Helper):
-    """Holds an operator and an expression."""
-
-    fields = ("op", "expr")
-
-
-class Mul(BinExpr):
-    """Multiplies the left with the right node."""
-
-    operator = "*"
-
-
-class Div(BinExpr):
-    """Divides the left by the right node."""
-
-    operator = "/"
-
-
-class FloorDiv(BinExpr):
-    """Divides the left by the right node and truncates conver the
-    result into an integer by truncating.
-    """
-
-    operator = "//"
-
-
-class Add(BinExpr):
-    """Add the left to the right node."""
-
-    operator = "+"
-
-
-class Sub(BinExpr):
-    """Subtract the right from the left node."""
-
-    operator = "-"
-
-
-class Mod(BinExpr):
-    """Left modulo right."""
-
-    operator = "%"
-
-
-class Pow(BinExpr):
-    """Left to the power of right."""
-
-    operator = "**"
-
-
-class And(BinExpr):
-    """Short circuited AND."""
-
-    operator = "and"
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return self.left.as_const(eval_ctx) and self.right.as_const(eval_ctx)
-
-
-class Or(BinExpr):
-    """Short circuited OR."""
-
-    operator = "or"
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return self.left.as_const(eval_ctx) or self.right.as_const(eval_ctx)
-
-
-class Not(UnaryExpr):
-    """Negate the expression."""
-
-    operator = "not"
-
-
-class Neg(UnaryExpr):
-    """Make the expression negative."""
-
-    operator = "-"
-
-
-class Pos(UnaryExpr):
-    """Make the expression positive (noop for most expressions)"""
-
-    operator = "+"
-
-
-# Helpers for extensions
-
-
-class EnvironmentAttribute(Expr):
-    """Loads an attribute from the environment object.  This is useful for
-    extensions that want to call a callback stored on the environment.
-    """
-
-    fields = ("name",)
-
-
-class ExtensionAttribute(Expr):
-    """Returns the attribute of an extension bound to the environment.
-    The identifier is the identifier of the :class:`Extension`.
-
-    This node is usually constructed by calling the
-    :meth:`~jinja2.ext.Extension.attr` method on an extension.
-    """
-
-    fields = ("identifier", "name")
-
-
-class ImportedName(Expr):
-    """If created with an import name the import name is returned on node
-    access.  For example ``ImportedName('cgi.escape')`` returns the `escape`
-    function from the cgi module on evaluation.  Imports are optimized by the
-    compiler so there is no need to assign them to local variables.
-    """
-
-    fields = ("importname",)
-
-
-class InternalName(Expr):
-    """An internal name in the compiler.  You cannot create these nodes
-    yourself but the parser provides a
-    :meth:`~jinja2.parser.Parser.free_identifier` method that creates
-    a new identifier for you.  This identifier is not available from the
-    template and is not threated specially by the compiler.
-    """
-
-    fields = ("name",)
-
-    def __init__(self):
-        raise TypeError(
-            "Can't create internal names.  Use the "
-            "`free_identifier` method on a parser."
-        )
-
-
-class MarkSafe(Expr):
-    """Mark the wrapped expression as safe (wrap it as `Markup`)."""
-
-    fields = ("expr",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return Markup(self.expr.as_const(eval_ctx))
-
-
-class MarkSafeIfAutoescape(Expr):
-    """Mark the wrapped expression as safe (wrap it as `Markup`) but
-    only if autoescaping is active.
-
-    .. versionadded:: 2.5
-    """
-
-    fields = ("expr",)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        if eval_ctx.volatile:
-            raise Impossible()
-        expr = self.expr.as_const(eval_ctx)
-        if eval_ctx.autoescape:
-            return Markup(expr)
-        return expr
-
-
-class ContextReference(Expr):
-    """Returns the current template context.  It can be used like a
-    :class:`Name` node, with a ``'load'`` ctx and will return the
-    current :class:`~jinja2.runtime.Context` object.
-
-    Here an example that assigns the current template name to a
-    variable named `foo`::
-
-        Assign(Name('foo', ctx='store'),
-               Getattr(ContextReference(), 'name'))
-
-    This is basically equivalent to using the
-    :func:`~jinja2.contextfunction` decorator when using the
-    high-level API, which causes a reference to the context to be passed
-    as the first argument to a function.
-    """
-
-
-class DerivedContextReference(Expr):
-    """Return the current template context including locals. Behaves
-    exactly like :class:`ContextReference`, but includes local
-    variables, such as from a ``for`` loop.
-
-    .. versionadded:: 2.11
-    """
-
-
-class Continue(Stmt):
-    """Continue a loop."""
-
-
-class Break(Stmt):
-    """Break a loop."""
-
-
-class Scope(Stmt):
-    """An artificial scope."""
-
-    fields = ("body",)
-
-
-class OverlayScope(Stmt):
-    """An overlay scope for extensions.  This is a largely unoptimized scope
-    that however can be used to introduce completely arbitrary variables into
-    a sub scope from a dictionary or dictionary like object.  The `context`
-    field has to evaluate to a dictionary object.
-
-    Example usage::
-
-        OverlayScope(context=self.call_method('get_context'),
-                     body=[...])
-
-    .. versionadded:: 2.10
-    """
-
-    fields = ("context", "body")
-
-
-class EvalContextModifier(Stmt):
-    """Modifies the eval context.  For each option that should be modified,
-    a :class:`Keyword` has to be added to the :attr:`options` list.
-
-    Example to change the `autoescape` setting::
-
-        EvalContextModifier(options=[Keyword('autoescape', Const(True))])
-    """
-
-    fields = ("options",)
-
-
-class ScopedEvalContextModifier(EvalContextModifier):
-    """Modifies the eval context and reverts it later.  Works exactly like
-    :class:`EvalContextModifier` but will only modify the
-    :class:`~jinja2.nodes.EvalContext` for nodes in the :attr:`body`.
-    """
-
-    fields = ("body",)
-
-
-# make sure nobody creates custom nodes
-def _failing_new(*args, **kwargs):
-    raise TypeError("can't create custom node types")
-
-
-NodeType.__new__ = staticmethod(_failing_new)
-del _failing_new
diff --git a/src/jinja2/optimizer.py b/src/jinja2/optimizer.py
deleted file mode 100644
index 39d059f1..00000000
--- a/src/jinja2/optimizer.py
+++ /dev/null
@@ -1,40 +0,0 @@
-"""The optimizer tries to constant fold expressions and modify the AST
-in place so that it should be faster to evaluate.
-
-Because the AST does not contain all the scoping information and the
-compiler has to find that out, we cannot do all the optimizations we
-want. For example, loop unrolling doesn't work because unrolled loops
-would have a different scope. The solution would be a second syntax tree
-that stored the scoping rules.
-"""
-from . import nodes
-from .visitor import NodeTransformer
-
-
-def optimize(node, environment):
-    """The context hint can be used to perform an static optimization
-    based on the context given."""
-    optimizer = Optimizer(environment)
-    return optimizer.visit(node)
-
-
-class Optimizer(NodeTransformer):
-    def __init__(self, environment):
-        self.environment = environment
-
-    def generic_visit(self, node, *args, **kwargs):
-        node = super().generic_visit(node, *args, **kwargs)
-
-        # Do constant folding. Some other nodes besides Expr have
-        # as_const, but folding them causes errors later on.
-        if isinstance(node, nodes.Expr):
-            try:
-                return nodes.Const.from_untrusted(
-                    node.as_const(args[0] if args else None),
-                    lineno=node.lineno,
-                    environment=self.environment,
-                )
-            except nodes.Impossible:
-                pass
-
-        return node
diff --git a/src/jinja2/parser.py b/src/jinja2/parser.py
deleted file mode 100644
index eedea7a0..00000000
--- a/src/jinja2/parser.py
+++ /dev/null
@@ -1,934 +0,0 @@
-"""Parse tokens from the lexer into nodes for the compiler."""
-from . import nodes
-from .exceptions import TemplateAssertionError
-from .exceptions import TemplateSyntaxError
-from .lexer import describe_token
-from .lexer import describe_token_expr
-
-_statement_keywords = frozenset(
-    [
-        "for",
-        "if",
-        "block",
-        "extends",
-        "print",
-        "macro",
-        "include",
-        "from",
-        "import",
-        "set",
-        "with",
-        "autoescape",
-    ]
-)
-_compare_operators = frozenset(["eq", "ne", "lt", "lteq", "gt", "gteq"])
-
-_math_nodes = {
-    "add": nodes.Add,
-    "sub": nodes.Sub,
-    "mul": nodes.Mul,
-    "div": nodes.Div,
-    "floordiv": nodes.FloorDiv,
-    "mod": nodes.Mod,
-}
-
-
-class Parser:
-    """This is the central parsing class Jinja uses.  It's passed to
-    extensions and can be used to parse expressions or statements.
-    """
-
-    def __init__(self, environment, source, name=None, filename=None, state=None):
-        self.environment = environment
-        self.stream = environment._tokenize(source, name, filename, state)
-        self.name = name
-        self.filename = filename
-        self.closed = False
-        self.extensions = {}
-        for extension in environment.iter_extensions():
-            for tag in extension.tags:
-                self.extensions[tag] = extension.parse
-        self._last_identifier = 0
-        self._tag_stack = []
-        self._end_token_stack = []
-
-    def fail(self, msg, lineno=None, exc=TemplateSyntaxError):
-        """Convenience method that raises `exc` with the message, passed
-        line number or last line number as well as the current name and
-        filename.
-        """
-        if lineno is None:
-            lineno = self.stream.current.lineno
-        raise exc(msg, lineno, self.name, self.filename)
-
-    def _fail_ut_eof(self, name, end_token_stack, lineno):
-        expected = []
-        for exprs in end_token_stack:
-            expected.extend(map(describe_token_expr, exprs))
-        if end_token_stack:
-            currently_looking = " or ".join(
-                map(repr, map(describe_token_expr, end_token_stack[-1]))
-            )
-        else:
-            currently_looking = None
-
-        if name is None:
-            message = ["Unexpected end of template."]
-        else:
-            message = [f"Encountered unknown tag {name!r}."]
-
-        if currently_looking:
-            if name is not None and name in expected:
-                message.append(
-                    "You probably made a nesting mistake. Jinja is expecting this tag,"
-                    f" but currently looking for {currently_looking}."
-                )
-            else:
-                message.append(
-                    f"Jinja was looking for the following tags: {currently_looking}."
-                )
-
-        if self._tag_stack:
-            message.append(
-                "The innermost block that needs to be closed is"
-                f" {self._tag_stack[-1]!r}."
-            )
-
-        self.fail(" ".join(message), lineno)
-
-    def fail_unknown_tag(self, name, lineno=None):
-        """Called if the parser encounters an unknown tag.  Tries to fail
-        with a human readable error message that could help to identify
-        the problem.
-        """
-        return self._fail_ut_eof(name, self._end_token_stack, lineno)
-
-    def fail_eof(self, end_tokens=None, lineno=None):
-        """Like fail_unknown_tag but for end of template situations."""
-        stack = list(self._end_token_stack)
-        if end_tokens is not None:
-            stack.append(end_tokens)
-        return self._fail_ut_eof(None, stack, lineno)
-
-    def is_tuple_end(self, extra_end_rules=None):
-        """Are we at the end of a tuple?"""
-        if self.stream.current.type in ("variable_end", "block_end", "rparen"):
-            return True
-        elif extra_end_rules is not None:
-            return self.stream.current.test_any(extra_end_rules)
-        return False
-
-    def free_identifier(self, lineno=None):
-        """Return a new free identifier as :class:`~jinja2.nodes.InternalName`."""
-        self._last_identifier += 1
-        rv = object.__new__(nodes.InternalName)
-        nodes.Node.__init__(rv, f"fi{self._last_identifier}", lineno=lineno)
-        return rv
-
-    def parse_statement(self):
-        """Parse a single statement."""
-        token = self.stream.current
-        if token.type != "name":
-            self.fail("tag name expected", token.lineno)
-        self._tag_stack.append(token.value)
-        pop_tag = True
-        try:
-            if token.value in _statement_keywords:
-                return getattr(self, "parse_" + self.stream.current.value)()
-            if token.value == "call":
-                return self.parse_call_block()
-            if token.value == "filter":
-                return self.parse_filter_block()
-            ext = self.extensions.get(token.value)
-            if ext is not None:
-                return ext(self)
-
-            # did not work out, remove the token we pushed by accident
-            # from the stack so that the unknown tag fail function can
-            # produce a proper error message.
-            self._tag_stack.pop()
-            pop_tag = False
-            self.fail_unknown_tag(token.value, token.lineno)
-        finally:
-            if pop_tag:
-                self._tag_stack.pop()
-
-    def parse_statements(self, end_tokens, drop_needle=False):
-        """Parse multiple statements into a list until one of the end tokens
-        is reached.  This is used to parse the body of statements as it also
-        parses template data if appropriate.  The parser checks first if the
-        current token is a colon and skips it if there is one.  Then it checks
-        for the block end and parses until if one of the `end_tokens` is
-        reached.  Per default the active token in the stream at the end of
-        the call is the matched end token.  If this is not wanted `drop_needle`
-        can be set to `True` and the end token is removed.
-        """
-        # the first token may be a colon for python compatibility
-        self.stream.skip_if("colon")
-
-        # in the future it would be possible to add whole code sections
-        # by adding some sort of end of statement token and parsing those here.
-        self.stream.expect("block_end")
-        result = self.subparse(end_tokens)
-
-        # we reached the end of the template too early, the subparser
-        # does not check for this, so we do that now
-        if self.stream.current.type == "eof":
-            self.fail_eof(end_tokens)
-
-        if drop_needle:
-            next(self.stream)
-        return result
-
-    def parse_set(self):
-        """Parse an assign statement."""
-        lineno = next(self.stream).lineno
-        target = self.parse_assign_target(with_namespace=True)
-        if self.stream.skip_if("assign"):
-            expr = self.parse_tuple()
-            return nodes.Assign(target, expr, lineno=lineno)
-        filter_node = self.parse_filter(None)
-        body = self.parse_statements(("name:endset",), drop_needle=True)
-        return nodes.AssignBlock(target, filter_node, body, lineno=lineno)
-
-    def parse_for(self):
-        """Parse a for loop."""
-        lineno = self.stream.expect("name:for").lineno
-        target = self.parse_assign_target(extra_end_rules=("name:in",))
-        self.stream.expect("name:in")
-        iter = self.parse_tuple(
-            with_condexpr=False, extra_end_rules=("name:recursive",)
-        )
-        test = None
-        if self.stream.skip_if("name:if"):
-            test = self.parse_expression()
-        recursive = self.stream.skip_if("name:recursive")
-        body = self.parse_statements(("name:endfor", "name:else"))
-        if next(self.stream).value == "endfor":
-            else_ = []
-        else:
-            else_ = self.parse_statements(("name:endfor",), drop_needle=True)
-        return nodes.For(target, iter, body, else_, test, recursive, lineno=lineno)
-
-    def parse_if(self):
-        """Parse an if construct."""
-        node = result = nodes.If(lineno=self.stream.expect("name:if").lineno)
-        while 1:
-            node.test = self.parse_tuple(with_condexpr=False)
-            node.body = self.parse_statements(("name:elif", "name:else", "name:endif"))
-            node.elif_ = []
-            node.else_ = []
-            token = next(self.stream)
-            if token.test("name:elif"):
-                node = nodes.If(lineno=self.stream.current.lineno)
-                result.elif_.append(node)
-                continue
-            elif token.test("name:else"):
-                result.else_ = self.parse_statements(("name:endif",), drop_needle=True)
-            break
-        return result
-
-    def parse_with(self):
-        node = nodes.With(lineno=next(self.stream).lineno)
-        targets = []
-        values = []
-        while self.stream.current.type != "block_end":
-            if targets:
-                self.stream.expect("comma")
-            target = self.parse_assign_target()
-            target.set_ctx("param")
-            targets.append(target)
-            self.stream.expect("assign")
-            values.append(self.parse_expression())
-        node.targets = targets
-        node.values = values
-        node.body = self.parse_statements(("name:endwith",), drop_needle=True)
-        return node
-
-    def parse_autoescape(self):
-        node = nodes.ScopedEvalContextModifier(lineno=next(self.stream).lineno)
-        node.options = [nodes.Keyword("autoescape", self.parse_expression())]
-        node.body = self.parse_statements(("name:endautoescape",), drop_needle=True)
-        return nodes.Scope([node])
-
-    def parse_block(self):
-        node = nodes.Block(lineno=next(self.stream).lineno)
-        node.name = self.stream.expect("name").value
-        node.scoped = self.stream.skip_if("name:scoped")
-
-        # common problem people encounter when switching from django
-        # to jinja.  we do not support hyphens in block names, so let's
-        # raise a nicer error message in that case.
-        if self.stream.current.type == "sub":
-            self.fail(
-                "Block names in Jinja have to be valid Python identifiers and may not"
-                " contain hyphens, use an underscore instead."
-            )
-
-        node.body = self.parse_statements(("name:endblock",), drop_needle=True)
-        self.stream.skip_if("name:" + node.name)
-        return node
-
-    def parse_extends(self):
-        node = nodes.Extends(lineno=next(self.stream).lineno)
-        node.template = self.parse_expression()
-        return node
-
-    def parse_import_context(self, node, default):
-        if self.stream.current.test_any(
-            "name:with", "name:without"
-        ) and self.stream.look().test("name:context"):
-            node.with_context = next(self.stream).value == "with"
-            self.stream.skip()
-        else:
-            node.with_context = default
-        return node
-
-    def parse_include(self):
-        node = nodes.Include(lineno=next(self.stream).lineno)
-        node.template = self.parse_expression()
-        if self.stream.current.test("name:ignore") and self.stream.look().test(
-            "name:missing"
-        ):
-            node.ignore_missing = True
-            self.stream.skip(2)
-        else:
-            node.ignore_missing = False
-        return self.parse_import_context(node, True)
-
-    def parse_import(self):
-        node = nodes.Import(lineno=next(self.stream).lineno)
-        node.template = self.parse_expression()
-        self.stream.expect("name:as")
-        node.target = self.parse_assign_target(name_only=True).name
-        return self.parse_import_context(node, False)
-
-    def parse_from(self):
-        node = nodes.FromImport(lineno=next(self.stream).lineno)
-        node.template = self.parse_expression()
-        self.stream.expect("name:import")
-        node.names = []
-
-        def parse_context():
-            if self.stream.current.value in (
-                "with",
-                "without",
-            ) and self.stream.look().test("name:context"):
-                node.with_context = next(self.stream).value == "with"
-                self.stream.skip()
-                return True
-            return False
-
-        while 1:
-            if node.names:
-                self.stream.expect("comma")
-            if self.stream.current.type == "name":
-                if parse_context():
-                    break
-                target = self.parse_assign_target(name_only=True)
-                if target.name.startswith("_"):
-                    self.fail(
-                        "names starting with an underline can not be imported",
-                        target.lineno,
-                        exc=TemplateAssertionError,
-                    )
-                if self.stream.skip_if("name:as"):
-                    alias = self.parse_assign_target(name_only=True)
-                    node.names.append((target.name, alias.name))
-                else:
-                    node.names.append(target.name)
-                if parse_context() or self.stream.current.type != "comma":
-                    break
-            else:
-                self.stream.expect("name")
-        if not hasattr(node, "with_context"):
-            node.with_context = False
-        return node
-
-    def parse_signature(self, node):
-        node.args = args = []
-        node.defaults = defaults = []
-        self.stream.expect("lparen")
-        while self.stream.current.type != "rparen":
-            if args:
-                self.stream.expect("comma")
-            arg = self.parse_assign_target(name_only=True)
-            arg.set_ctx("param")
-            if self.stream.skip_if("assign"):
-                defaults.append(self.parse_expression())
-            elif defaults:
-                self.fail("non-default argument follows default argument")
-            args.append(arg)
-        self.stream.expect("rparen")
-
-    def parse_call_block(self):
-        node = nodes.CallBlock(lineno=next(self.stream).lineno)
-        if self.stream.current.type == "lparen":
-            self.parse_signature(node)
-        else:
-            node.args = []
-            node.defaults = []
-
-        node.call = self.parse_expression()
-        if not isinstance(node.call, nodes.Call):
-            self.fail("expected call", node.lineno)
-        node.body = self.parse_statements(("name:endcall",), drop_needle=True)
-        return node
-
-    def parse_filter_block(self):
-        node = nodes.FilterBlock(lineno=next(self.stream).lineno)
-        node.filter = self.parse_filter(None, start_inline=True)
-        node.body = self.parse_statements(("name:endfilter",), drop_needle=True)
-        return node
-
-    def parse_macro(self):
-        node = nodes.Macro(lineno=next(self.stream).lineno)
-        node.name = self.parse_assign_target(name_only=True).name
-        self.parse_signature(node)
-        node.body = self.parse_statements(("name:endmacro",), drop_needle=True)
-        return node
-
-    def parse_print(self):
-        node = nodes.Output(lineno=next(self.stream).lineno)
-        node.nodes = []
-        while self.stream.current.type != "block_end":
-            if node.nodes:
-                self.stream.expect("comma")
-            node.nodes.append(self.parse_expression())
-        return node
-
-    def parse_assign_target(
-        self,
-        with_tuple=True,
-        name_only=False,
-        extra_end_rules=None,
-        with_namespace=False,
-    ):
-        """Parse an assignment target.  As Jinja allows assignments to
-        tuples, this function can parse all allowed assignment targets.  Per
-        default assignments to tuples are parsed, that can be disable however
-        by setting `with_tuple` to `False`.  If only assignments to names are
-        wanted `name_only` can be set to `True`.  The `extra_end_rules`
-        parameter is forwarded to the tuple parsing function.  If
-        `with_namespace` is enabled, a namespace assignment may be parsed.
-        """
-        if with_namespace and self.stream.look().type == "dot":
-            token = self.stream.expect("name")
-            next(self.stream)  # dot
-            attr = self.stream.expect("name")
-            target = nodes.NSRef(token.value, attr.value, lineno=token.lineno)
-        elif name_only:
-            token = self.stream.expect("name")
-            target = nodes.Name(token.value, "store", lineno=token.lineno)
-        else:
-            if with_tuple:
-                target = self.parse_tuple(
-                    simplified=True, extra_end_rules=extra_end_rules
-                )
-            else:
-                target = self.parse_primary()
-            target.set_ctx("store")
-        if not target.can_assign():
-            self.fail(
-                f"can't assign to {target.__class__.__name__.lower()!r}", target.lineno
-            )
-        return target
-
-    def parse_expression(self, with_condexpr=True):
-        """Parse an expression.  Per default all expressions are parsed, if
-        the optional `with_condexpr` parameter is set to `False` conditional
-        expressions are not parsed.
-        """
-        if with_condexpr:
-            return self.parse_condexpr()
-        return self.parse_or()
-
-    def parse_condexpr(self):
-        lineno = self.stream.current.lineno
-        expr1 = self.parse_or()
-        while self.stream.skip_if("name:if"):
-            expr2 = self.parse_or()
-            if self.stream.skip_if("name:else"):
-                expr3 = self.parse_condexpr()
-            else:
-                expr3 = None
-            expr1 = nodes.CondExpr(expr2, expr1, expr3, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return expr1
-
-    def parse_or(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_and()
-        while self.stream.skip_if("name:or"):
-            right = self.parse_and()
-            left = nodes.Or(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_and(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_not()
-        while self.stream.skip_if("name:and"):
-            right = self.parse_not()
-            left = nodes.And(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_not(self):
-        if self.stream.current.test("name:not"):
-            lineno = next(self.stream).lineno
-            return nodes.Not(self.parse_not(), lineno=lineno)
-        return self.parse_compare()
-
-    def parse_compare(self):
-        lineno = self.stream.current.lineno
-        expr = self.parse_math1()
-        ops = []
-        while 1:
-            token_type = self.stream.current.type
-            if token_type in _compare_operators:
-                next(self.stream)
-                ops.append(nodes.Operand(token_type, self.parse_math1()))
-            elif self.stream.skip_if("name:in"):
-                ops.append(nodes.Operand("in", self.parse_math1()))
-            elif self.stream.current.test("name:not") and self.stream.look().test(
-                "name:in"
-            ):
-                self.stream.skip(2)
-                ops.append(nodes.Operand("notin", self.parse_math1()))
-            else:
-                break
-            lineno = self.stream.current.lineno
-        if not ops:
-            return expr
-        return nodes.Compare(expr, ops, lineno=lineno)
-
-    def parse_math1(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_concat()
-        while self.stream.current.type in ("add", "sub"):
-            cls = _math_nodes[self.stream.current.type]
-            next(self.stream)
-            right = self.parse_concat()
-            left = cls(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_concat(self):
-        lineno = self.stream.current.lineno
-        args = [self.parse_math2()]
-        while self.stream.current.type == "tilde":
-            next(self.stream)
-            args.append(self.parse_math2())
-        if len(args) == 1:
-            return args[0]
-        return nodes.Concat(args, lineno=lineno)
-
-    def parse_math2(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_pow()
-        while self.stream.current.type in ("mul", "div", "floordiv", "mod"):
-            cls = _math_nodes[self.stream.current.type]
-            next(self.stream)
-            right = self.parse_pow()
-            left = cls(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_pow(self):
-        lineno = self.stream.current.lineno
-        left = self.parse_unary()
-        while self.stream.current.type == "pow":
-            next(self.stream)
-            right = self.parse_unary()
-            left = nodes.Pow(left, right, lineno=lineno)
-            lineno = self.stream.current.lineno
-        return left
-
-    def parse_unary(self, with_filter=True):
-        token_type = self.stream.current.type
-        lineno = self.stream.current.lineno
-        if token_type == "sub":
-            next(self.stream)
-            node = nodes.Neg(self.parse_unary(False), lineno=lineno)
-        elif token_type == "add":
-            next(self.stream)
-            node = nodes.Pos(self.parse_unary(False), lineno=lineno)
-        else:
-            node = self.parse_primary()
-        node = self.parse_postfix(node)
-        if with_filter:
-            node = self.parse_filter_expr(node)
-        return node
-
-    def parse_primary(self):
-        token = self.stream.current
-        if token.type == "name":
-            if token.value in ("true", "false", "True", "False"):
-                node = nodes.Const(token.value in ("true", "True"), lineno=token.lineno)
-            elif token.value in ("none", "None"):
-                node = nodes.Const(None, lineno=token.lineno)
-            else:
-                node = nodes.Name(token.value, "load", lineno=token.lineno)
-            next(self.stream)
-        elif token.type == "string":
-            next(self.stream)
-            buf = [token.value]
-            lineno = token.lineno
-            while self.stream.current.type == "string":
-                buf.append(self.stream.current.value)
-                next(self.stream)
-            node = nodes.Const("".join(buf), lineno=lineno)
-        elif token.type in ("integer", "float"):
-            next(self.stream)
-            node = nodes.Const(token.value, lineno=token.lineno)
-        elif token.type == "lparen":
-            next(self.stream)
-            node = self.parse_tuple(explicit_parentheses=True)
-            self.stream.expect("rparen")
-        elif token.type == "lbracket":
-            node = self.parse_list()
-        elif token.type == "lbrace":
-            node = self.parse_dict()
-        else:
-            self.fail(f"unexpected {describe_token(token)!r}", token.lineno)
-        return node
-
-    def parse_tuple(
-        self,
-        simplified=False,
-        with_condexpr=True,
-        extra_end_rules=None,
-        explicit_parentheses=False,
-    ):
-        """Works like `parse_expression` but if multiple expressions are
-        delimited by a comma a :class:`~jinja2.nodes.Tuple` node is created.
-        This method could also return a regular expression instead of a tuple
-        if no commas where found.
-
-        The default parsing mode is a full tuple.  If `simplified` is `True`
-        only names and literals are parsed.  The `no_condexpr` parameter is
-        forwarded to :meth:`parse_expression`.
-
-        Because tuples do not require delimiters and may end in a bogus comma
-        an extra hint is needed that marks the end of a tuple.  For example
-        for loops support tuples between `for` and `in`.  In that case the
-        `extra_end_rules` is set to ``['name:in']``.
-
-        `explicit_parentheses` is true if the parsing was triggered by an
-        expression in parentheses.  This is used to figure out if an empty
-        tuple is a valid expression or not.
-        """
-        lineno = self.stream.current.lineno
-        if simplified:
-            parse = self.parse_primary
-        elif with_condexpr:
-            parse = self.parse_expression
-        else:
-
-            def parse():
-                return self.parse_expression(with_condexpr=False)
-
-        args = []
-        is_tuple = False
-        while 1:
-            if args:
-                self.stream.expect("comma")
-            if self.is_tuple_end(extra_end_rules):
-                break
-            args.append(parse())
-            if self.stream.current.type == "comma":
-                is_tuple = True
-            else:
-                break
-            lineno = self.stream.current.lineno
-
-        if not is_tuple:
-            if args:
-                return args[0]
-
-            # if we don't have explicit parentheses, an empty tuple is
-            # not a valid expression.  This would mean nothing (literally
-            # nothing) in the spot of an expression would be an empty
-            # tuple.
-            if not explicit_parentheses:
-                self.fail(
-                    "Expected an expression,"
-                    f" got {describe_token(self.stream.current)!r}"
-                )
-
-        return nodes.Tuple(args, "load", lineno=lineno)
-
-    def parse_list(self):
-        token = self.stream.expect("lbracket")
-        items = []
-        while self.stream.current.type != "rbracket":
-            if items:
-                self.stream.expect("comma")
-            if self.stream.current.type == "rbracket":
-                break
-            items.append(self.parse_expression())
-        self.stream.expect("rbracket")
-        return nodes.List(items, lineno=token.lineno)
-
-    def parse_dict(self):
-        token = self.stream.expect("lbrace")
-        items = []
-        while self.stream.current.type != "rbrace":
-            if items:
-                self.stream.expect("comma")
-            if self.stream.current.type == "rbrace":
-                break
-            key = self.parse_expression()
-            self.stream.expect("colon")
-            value = self.parse_expression()
-            items.append(nodes.Pair(key, value, lineno=key.lineno))
-        self.stream.expect("rbrace")
-        return nodes.Dict(items, lineno=token.lineno)
-
-    def parse_postfix(self, node):
-        while 1:
-            token_type = self.stream.current.type
-            if token_type == "dot" or token_type == "lbracket":
-                node = self.parse_subscript(node)
-            # calls are valid both after postfix expressions (getattr
-            # and getitem) as well as filters and tests
-            elif token_type == "lparen":
-                node = self.parse_call(node)
-            else:
-                break
-        return node
-
-    def parse_filter_expr(self, node):
-        while 1:
-            token_type = self.stream.current.type
-            if token_type == "pipe":
-                node = self.parse_filter(node)
-            elif token_type == "name" and self.stream.current.value == "is":
-                node = self.parse_test(node)
-            # calls are valid both after postfix expressions (getattr
-            # and getitem) as well as filters and tests
-            elif token_type == "lparen":
-                node = self.parse_call(node)
-            else:
-                break
-        return node
-
-    def parse_subscript(self, node):
-        token = next(self.stream)
-        if token.type == "dot":
-            attr_token = self.stream.current
-            next(self.stream)
-            if attr_token.type == "name":
-                return nodes.Getattr(
-                    node, attr_token.value, "load", lineno=token.lineno
-                )
-            elif attr_token.type != "integer":
-                self.fail("expected name or number", attr_token.lineno)
-            arg = nodes.Const(attr_token.value, lineno=attr_token.lineno)
-            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
-        if token.type == "lbracket":
-            args = []
-            while self.stream.current.type != "rbracket":
-                if args:
-                    self.stream.expect("comma")
-                args.append(self.parse_subscribed())
-            self.stream.expect("rbracket")
-            if len(args) == 1:
-                arg = args[0]
-            else:
-                arg = nodes.Tuple(args, "load", lineno=token.lineno)
-            return nodes.Getitem(node, arg, "load", lineno=token.lineno)
-        self.fail("expected subscript expression", token.lineno)
-
-    def parse_subscribed(self):
-        lineno = self.stream.current.lineno
-
-        if self.stream.current.type == "colon":
-            next(self.stream)
-            args = [None]
-        else:
-            node = self.parse_expression()
-            if self.stream.current.type != "colon":
-                return node
-            next(self.stream)
-            args = [node]
-
-        if self.stream.current.type == "colon":
-            args.append(None)
-        elif self.stream.current.type not in ("rbracket", "comma"):
-            args.append(self.parse_expression())
-        else:
-            args.append(None)
-
-        if self.stream.current.type == "colon":
-            next(self.stream)
-            if self.stream.current.type not in ("rbracket", "comma"):
-                args.append(self.parse_expression())
-            else:
-                args.append(None)
-        else:
-            args.append(None)
-
-        return nodes.Slice(lineno=lineno, *args)
-
-    def parse_call(self, node):
-        token = self.stream.expect("lparen")
-        args = []
-        kwargs = []
-        dyn_args = dyn_kwargs = None
-        require_comma = False
-
-        def ensure(expr):
-            if not expr:
-                self.fail("invalid syntax for function call expression", token.lineno)
-
-        while self.stream.current.type != "rparen":
-            if require_comma:
-                self.stream.expect("comma")
-                # support for trailing comma
-                if self.stream.current.type == "rparen":
-                    break
-            if self.stream.current.type == "mul":
-                ensure(dyn_args is None and dyn_kwargs is None)
-                next(self.stream)
-                dyn_args = self.parse_expression()
-            elif self.stream.current.type == "pow":
-                ensure(dyn_kwargs is None)
-                next(self.stream)
-                dyn_kwargs = self.parse_expression()
-            else:
-                if (
-                    self.stream.current.type == "name"
-                    and self.stream.look().type == "assign"
-                ):
-                    # Parsing a kwarg
-                    ensure(dyn_kwargs is None)
-                    key = self.stream.current.value
-                    self.stream.skip(2)
-                    value = self.parse_expression()
-                    kwargs.append(nodes.Keyword(key, value, lineno=value.lineno))
-                else:
-                    # Parsing an arg
-                    ensure(dyn_args is None and dyn_kwargs is None and not kwargs)
-                    args.append(self.parse_expression())
-
-            require_comma = True
-        self.stream.expect("rparen")
-
-        if node is None:
-            return args, kwargs, dyn_args, dyn_kwargs
-        return nodes.Call(node, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno)
-
-    def parse_filter(self, node, start_inline=False):
-        while self.stream.current.type == "pipe" or start_inline:
-            if not start_inline:
-                next(self.stream)
-            token = self.stream.expect("name")
-            name = token.value
-            while self.stream.current.type == "dot":
-                next(self.stream)
-                name += "." + self.stream.expect("name").value
-            if self.stream.current.type == "lparen":
-                args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
-            else:
-                args = []
-                kwargs = []
-                dyn_args = dyn_kwargs = None
-            node = nodes.Filter(
-                node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
-            )
-            start_inline = False
-        return node
-
-    def parse_test(self, node):
-        token = next(self.stream)
-        if self.stream.current.test("name:not"):
-            next(self.stream)
-            negated = True
-        else:
-            negated = False
-        name = self.stream.expect("name").value
-        while self.stream.current.type == "dot":
-            next(self.stream)
-            name += "." + self.stream.expect("name").value
-        dyn_args = dyn_kwargs = None
-        kwargs = []
-        if self.stream.current.type == "lparen":
-            args, kwargs, dyn_args, dyn_kwargs = self.parse_call(None)
-        elif self.stream.current.type in (
-            "name",
-            "string",
-            "integer",
-            "float",
-            "lparen",
-            "lbracket",
-            "lbrace",
-        ) and not self.stream.current.test_any("name:else", "name:or", "name:and"):
-            if self.stream.current.test("name:is"):
-                self.fail("You cannot chain multiple tests with is")
-            arg_node = self.parse_primary()
-            arg_node = self.parse_postfix(arg_node)
-            args = [arg_node]
-        else:
-            args = []
-        node = nodes.Test(
-            node, name, args, kwargs, dyn_args, dyn_kwargs, lineno=token.lineno
-        )
-        if negated:
-            node = nodes.Not(node, lineno=token.lineno)
-        return node
-
-    def subparse(self, end_tokens=None):
-        body = []
-        data_buffer = []
-        add_data = data_buffer.append
-
-        if end_tokens is not None:
-            self._end_token_stack.append(end_tokens)
-
-        def flush_data():
-            if data_buffer:
-                lineno = data_buffer[0].lineno
-                body.append(nodes.Output(data_buffer[:], lineno=lineno))
-                del data_buffer[:]
-
-        try:
-            while self.stream:
-                token = self.stream.current
-                if token.type == "data":
-                    if token.value:
-                        add_data(nodes.TemplateData(token.value, lineno=token.lineno))
-                    next(self.stream)
-                elif token.type == "variable_begin":
-                    next(self.stream)
-                    add_data(self.parse_tuple(with_condexpr=True))
-                    self.stream.expect("variable_end")
-                elif token.type == "block_begin":
-                    flush_data()
-                    next(self.stream)
-                    if end_tokens is not None and self.stream.current.test_any(
-                        *end_tokens
-                    ):
-                        return body
-                    rv = self.parse_statement()
-                    if isinstance(rv, list):
-                        body.extend(rv)
-                    else:
-                        body.append(rv)
-                    self.stream.expect("block_end")
-                else:
-                    raise AssertionError("internal parsing error")
-
-            flush_data()
-        finally:
-            if end_tokens is not None:
-                self._end_token_stack.pop()
-
-        return body
-
-    def parse(self):
-        """Parse the whole template into a `Template` node."""
-        result = nodes.Template(self.subparse(), lineno=1)
-        result.set_environment(self.environment)
-        return result
diff --git a/src/jinja2/runtime.py b/src/jinja2/runtime.py
deleted file mode 100644
index 7b5925b1..00000000
--- a/src/jinja2/runtime.py
+++ /dev/null
@@ -1,919 +0,0 @@
-"""The runtime functions and state used by compiled templates."""
-import sys
-from collections import abc
-from itertools import chain
-from types import MethodType
-
-from markupsafe import escape  # noqa: F401
-from markupsafe import Markup
-from markupsafe import soft_str
-
-from .exceptions import TemplateNotFound  # noqa: F401
-from .exceptions import TemplateRuntimeError  # noqa: F401
-from .exceptions import UndefinedError
-from .nodes import EvalContext
-from .utils import concat
-from .utils import evalcontextfunction
-from .utils import internalcode
-from .utils import missing
-from .utils import Namespace  # noqa: F401
-from .utils import object_type_repr
-
-# these variables are exported to the template runtime
-exported = [
-    "LoopContext",
-    "TemplateReference",
-    "Macro",
-    "Markup",
-    "TemplateRuntimeError",
-    "missing",
-    "concat",
-    "escape",
-    "markup_join",
-    "str_join",
-    "identity",
-    "TemplateNotFound",
-    "Namespace",
-    "Undefined",
-]
-
-
-def identity(x):
-    """Returns its argument. Useful for certain things in the
-    environment.
-    """
-    return x
-
-
-def markup_join(seq):
-    """Concatenation that escapes if necessary and converts to string."""
-    buf = []
-    iterator = map(soft_str, seq)
-    for arg in iterator:
-        buf.append(arg)
-        if hasattr(arg, "__html__"):
-            return Markup("").join(chain(buf, iterator))
-    return concat(buf)
-
-
-def str_join(seq):
-    """Simple args to string conversion and concatenation."""
-    return concat(map(str, seq))
-
-
-def unicode_join(seq):
-    import warnings
-
-    warnings.warn(
-        "This template must be recompiled with at least Jinja 3.0, or"
-        " it will fail in 3.1.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    return str_join(seq)
-
-
-def new_context(
-    environment,
-    template_name,
-    blocks,
-    vars=None,
-    shared=None,
-    globals=None,
-    locals=None,
-):
-    """Internal helper for context creation."""
-    if vars is None:
-        vars = {}
-    if shared:
-        parent = vars
-    else:
-        parent = dict(globals or (), **vars)
-    if locals:
-        # if the parent is shared a copy should be created because
-        # we don't want to modify the dict passed
-        if shared:
-            parent = dict(parent)
-        for key, value in locals.items():
-            if value is not missing:
-                parent[key] = value
-    return environment.context_class(
-        environment, parent, template_name, blocks, globals=globals
-    )
-
-
-class TemplateReference:
-    """The `self` in templates."""
-
-    def __init__(self, context):
-        self.__context = context
-
-    def __getitem__(self, name):
-        blocks = self.__context.blocks[name]
-        return BlockReference(name, self.__context, blocks, 0)
-
-    def __repr__(self):
-        return f"<{self.__class__.__name__} {self.__context.name!r}>"
-
-
-def _get_func(x):
-    return getattr(x, "__func__", x)
-
-
-class ContextMeta(type):
-    def __new__(mcs, name, bases, d):
-        rv = type.__new__(mcs, name, bases, d)
-        if bases == ():
-            return rv
-
-        resolve = _get_func(rv.resolve)
-        default_resolve = _get_func(Context.resolve)
-        resolve_or_missing = _get_func(rv.resolve_or_missing)
-        default_resolve_or_missing = _get_func(Context.resolve_or_missing)
-
-        # If we have a changed resolve but no changed default or missing
-        # resolve we invert the call logic.
-        if (
-            resolve is not default_resolve
-            and resolve_or_missing is default_resolve_or_missing
-        ):
-            rv._legacy_resolve_mode = True
-        elif (
-            resolve is default_resolve
-            and resolve_or_missing is default_resolve_or_missing
-        ):
-            rv._fast_resolve_mode = True
-
-        return rv
-
-
-def resolve_or_missing(context, key, missing=missing):
-    if key in context.vars:
-        return context.vars[key]
-    if key in context.parent:
-        return context.parent[key]
-    return missing
-
-
-@abc.Mapping.register
-class Context(metaclass=ContextMeta):
-    """The template context holds the variables of a template.  It stores the
-    values passed to the template and also the names the template exports.
-    Creating instances is neither supported nor useful as it's created
-    automatically at various stages of the template evaluation and should not
-    be created by hand.
-
-    The context is immutable.  Modifications on :attr:`parent` **must not**
-    happen and modifications on :attr:`vars` are allowed from generated
-    template code only.  Template filters and global functions marked as
-    :func:`contextfunction`\\s get the active context passed as first argument
-    and are allowed to access the context read-only.
-
-    The template context supports read only dict operations (`get`,
-    `keys`, `values`, `items`, `iterkeys`, `itervalues`, `iteritems`,
-    `__getitem__`, `__contains__`).  Additionally there is a :meth:`resolve`
-    method that doesn't fail with a `KeyError` but returns an
-    :class:`Undefined` object for missing variables.
-    """
-
-    # XXX: we want to eventually make this be a deprecation warning and
-    # remove it.
-    _legacy_resolve_mode = False
-    _fast_resolve_mode = False
-
-    def __init__(self, environment, parent, name, blocks, globals=None):
-        self.parent = parent
-        self.vars = {}
-        self.environment = environment
-        self.eval_ctx = EvalContext(self.environment, name)
-        self.exported_vars = set()
-        self.name = name
-        self.globals_keys = set() if globals is None else set(globals)
-
-        # create the initial mapping of blocks.  Whenever template inheritance
-        # takes place the runtime will update this mapping with the new blocks
-        # from the template.
-        self.blocks = {k: [v] for k, v in blocks.items()}
-
-        # In case we detect the fast resolve mode we can set up an alias
-        # here that bypasses the legacy code logic.
-        if self._fast_resolve_mode:
-            self.resolve_or_missing = MethodType(resolve_or_missing, self)
-
-    def super(self, name, current):
-        """Render a parent block."""
-        try:
-            blocks = self.blocks[name]
-            index = blocks.index(current) + 1
-            blocks[index]
-        except LookupError:
-            return self.environment.undefined(
-                f"there is no parent block called {name!r}.", name="super"
-            )
-        return BlockReference(name, self, blocks, index)
-
-    def get(self, key, default=None):
-        """Returns an item from the template context, if it doesn't exist
-        `default` is returned.
-        """
-        try:
-            return self[key]
-        except KeyError:
-            return default
-
-    def resolve(self, key):
-        """Looks up a variable like `__getitem__` or `get` but returns an
-        :class:`Undefined` object with the name of the name looked up.
-        """
-        if self._legacy_resolve_mode:
-            rv = resolve_or_missing(self, key)
-        else:
-            rv = self.resolve_or_missing(key)
-        if rv is missing:
-            return self.environment.undefined(name=key)
-        return rv
-
-    def resolve_or_missing(self, key):
-        """Resolves a variable like :meth:`resolve` but returns the
-        special `missing` value if it cannot be found.
-        """
-        if self._legacy_resolve_mode:
-            rv = self.resolve(key)
-            if isinstance(rv, Undefined):
-                rv = missing
-            return rv
-        return resolve_or_missing(self, key)
-
-    def get_exported(self):
-        """Get a new dict with the exported variables."""
-        return {k: self.vars[k] for k in self.exported_vars}
-
-    def get_all(self):
-        """Return the complete context as dict including the exported
-        variables.  For optimizations reasons this might not return an
-        actual copy so be careful with using it.
-        """
-        if not self.vars:
-            return self.parent
-        if not self.parent:
-            return self.vars
-        return dict(self.parent, **self.vars)
-
-    @internalcode
-    def call(__self, __obj, *args, **kwargs):  # noqa: B902
-        """Call the callable with the arguments and keyword arguments
-        provided but inject the active context or environment as first
-        argument if the callable is a :func:`contextfunction` or
-        :func:`environmentfunction`.
-        """
-        if __debug__:
-            __traceback_hide__ = True  # noqa
-
-        # Allow callable classes to take a context
-        if hasattr(__obj, "__call__"):  # noqa: B004
-            fn = __obj.__call__
-            for fn_type in (
-                "contextfunction",
-                "evalcontextfunction",
-                "environmentfunction",
-            ):
-                if hasattr(fn, fn_type):
-                    __obj = fn
-                    break
-
-        if callable(__obj):
-            if getattr(__obj, "contextfunction", False) is True:
-                args = (__self,) + args
-            elif getattr(__obj, "evalcontextfunction", False) is True:
-                args = (__self.eval_ctx,) + args
-            elif getattr(__obj, "environmentfunction", False) is True:
-                args = (__self.environment,) + args
-        try:
-            return __obj(*args, **kwargs)
-        except StopIteration:
-            return __self.environment.undefined(
-                "value was undefined because a callable raised a"
-                " StopIteration exception"
-            )
-
-    def derived(self, locals=None):
-        """Internal helper function to create a derived context.  This is
-        used in situations where the system needs a new context in the same
-        template that is independent.
-        """
-        context = new_context(
-            self.environment, self.name, {}, self.get_all(), True, None, locals
-        )
-        context.eval_ctx = self.eval_ctx
-        context.blocks.update((k, list(v)) for k, v in self.blocks.items())
-        return context
-
-    def _all(meth):  # noqa: B902
-        def proxy(self):
-            return getattr(self.get_all(), meth)()
-
-        proxy.__doc__ = getattr(dict, meth).__doc__
-        proxy.__name__ = meth
-        return proxy
-
-    keys = _all("keys")
-    values = _all("values")
-    items = _all("items")
-    del _all
-
-    def __contains__(self, name):
-        return name in self.vars or name in self.parent
-
-    def __getitem__(self, key):
-        """Lookup a variable or raise `KeyError` if the variable is
-        undefined.
-        """
-        item = self.resolve_or_missing(key)
-        if item is missing:
-            raise KeyError(key)
-        return item
-
-    def __repr__(self):
-        return f"<{self.__class__.__name__} {self.get_all()!r} of {self.name!r}>"
-
-
-class BlockReference:
-    """One block on a template reference."""
-
-    def __init__(self, name, context, stack, depth):
-        self.name = name
-        self._context = context
-        self._stack = stack
-        self._depth = depth
-
-    @property
-    def super(self):
-        """Super the block."""
-        if self._depth + 1 >= len(self._stack):
-            return self._context.environment.undefined(
-                f"there is no parent block called {self.name!r}.", name="super"
-            )
-        return BlockReference(self.name, self._context, self._stack, self._depth + 1)
-
-    @internalcode
-    def __call__(self):
-        rv = concat(self._stack[self._depth](self._context))
-        if self._context.eval_ctx.autoescape:
-            rv = Markup(rv)
-        return rv
-
-
-class LoopContext:
-    """A wrapper iterable for dynamic ``for`` loops, with information
-    about the loop and iteration.
-    """
-
-    #: Current iteration of the loop, starting at 0.
-    index0 = -1
-
-    _length = None
-    _after = missing
-    _current = missing
-    _before = missing
-    _last_changed_value = missing
-
-    def __init__(self, iterable, undefined, recurse=None, depth0=0):
-        """
-        :param iterable: Iterable to wrap.
-        :param undefined: :class:`Undefined` class to use for next and
-            previous items.
-        :param recurse: The function to render the loop body when the
-            loop is marked recursive.
-        :param depth0: Incremented when looping recursively.
-        """
-        self._iterable = iterable
-        self._iterator = self._to_iterator(iterable)
-        self._undefined = undefined
-        self._recurse = recurse
-        #: How many levels deep a recursive loop currently is, starting at 0.
-        self.depth0 = depth0
-
-    @staticmethod
-    def _to_iterator(iterable):
-        return iter(iterable)
-
-    @property
-    def length(self):
-        """Length of the iterable.
-
-        If the iterable is a generator or otherwise does not have a
-        size, it is eagerly evaluated to get a size.
-        """
-        if self._length is not None:
-            return self._length
-
-        try:
-            self._length = len(self._iterable)
-        except TypeError:
-            iterable = list(self._iterator)
-            self._iterator = self._to_iterator(iterable)
-            self._length = len(iterable) + self.index + (self._after is not missing)
-
-        return self._length
-
-    def __len__(self):
-        return self.length
-
-    @property
-    def depth(self):
-        """How many levels deep a recursive loop currently is, starting at 1."""
-        return self.depth0 + 1
-
-    @property
-    def index(self):
-        """Current iteration of the loop, starting at 1."""
-        return self.index0 + 1
-
-    @property
-    def revindex0(self):
-        """Number of iterations from the end of the loop, ending at 0.
-
-        Requires calculating :attr:`length`.
-        """
-        return self.length - self.index
-
-    @property
-    def revindex(self):
-        """Number of iterations from the end of the loop, ending at 1.
-
-        Requires calculating :attr:`length`.
-        """
-        return self.length - self.index0
-
-    @property
-    def first(self):
-        """Whether this is the first iteration of the loop."""
-        return self.index0 == 0
-
-    def _peek_next(self):
-        """Return the next element in the iterable, or :data:`missing`
-        if the iterable is exhausted. Only peeks one item ahead, caching
-        the result in :attr:`_last` for use in subsequent checks. The
-        cache is reset when :meth:`__next__` is called.
-        """
-        if self._after is not missing:
-            return self._after
-
-        self._after = next(self._iterator, missing)
-        return self._after
-
-    @property
-    def last(self):
-        """Whether this is the last iteration of the loop.
-
-        Causes the iterable to advance early. See
-        :func:`itertools.groupby` for issues this can cause.
-        The :func:`groupby` filter avoids that issue.
-        """
-        return self._peek_next() is missing
-
-    @property
-    def previtem(self):
-        """The item in the previous iteration. Undefined during the
-        first iteration.
-        """
-        if self.first:
-            return self._undefined("there is no previous item")
-
-        return self._before
-
-    @property
-    def nextitem(self):
-        """The item in the next iteration. Undefined during the last
-        iteration.
-
-        Causes the iterable to advance early. See
-        :func:`itertools.groupby` for issues this can cause.
-        The :func:`groupby` filter avoids that issue.
-        """
-        rv = self._peek_next()
-
-        if rv is missing:
-            return self._undefined("there is no next item")
-
-        return rv
-
-    def cycle(self, *args):
-        """Return a value from the given args, cycling through based on
-        the current :attr:`index0`.
-
-        :param args: One or more values to cycle through.
-        """
-        if not args:
-            raise TypeError("no items for cycling given")
-
-        return args[self.index0 % len(args)]
-
-    def changed(self, *value):
-        """Return ``True`` if previously called with a different value
-        (including when called for the first time).
-
-        :param value: One or more values to compare to the last call.
-        """
-        if self._last_changed_value != value:
-            self._last_changed_value = value
-            return True
-
-        return False
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        if self._after is not missing:
-            rv = self._after
-            self._after = missing
-        else:
-            rv = next(self._iterator)
-
-        self.index0 += 1
-        self._before = self._current
-        self._current = rv
-        return rv, self
-
-    @internalcode
-    def __call__(self, iterable):
-        """When iterating over nested data, render the body of the loop
-        recursively with the given inner iterable data.
-
-        The loop must have the ``recursive`` marker for this to work.
-        """
-        if self._recurse is None:
-            raise TypeError(
-                "The loop must have the 'recursive' marker to be called recursively."
-            )
-
-        return self._recurse(iterable, self._recurse, depth=self.depth)
-
-    def __repr__(self):
-        return f"<{self.__class__.__name__} {self.index}/{self.length}>"
-
-
-class Macro:
-    """Wraps a macro function."""
-
-    def __init__(
-        self,
-        environment,
-        func,
-        name,
-        arguments,
-        catch_kwargs,
-        catch_varargs,
-        caller,
-        default_autoescape=None,
-    ):
-        self._environment = environment
-        self._func = func
-        self._argument_count = len(arguments)
-        self.name = name
-        self.arguments = arguments
-        self.catch_kwargs = catch_kwargs
-        self.catch_varargs = catch_varargs
-        self.caller = caller
-        self.explicit_caller = "caller" in arguments
-        if default_autoescape is None:
-            default_autoescape = environment.autoescape
-        self._default_autoescape = default_autoescape
-
-    @internalcode
-    @evalcontextfunction
-    def __call__(self, *args, **kwargs):
-        # This requires a bit of explanation,  In the past we used to
-        # decide largely based on compile-time information if a macro is
-        # safe or unsafe.  While there was a volatile mode it was largely
-        # unused for deciding on escaping.  This turns out to be
-        # problematic for macros because whether a macro is safe depends not
-        # on the escape mode when it was defined, but rather when it was used.
-        #
-        # Because however we export macros from the module system and
-        # there are historic callers that do not pass an eval context (and
-        # will continue to not pass one), we need to perform an instance
-        # check here.
-        #
-        # This is considered safe because an eval context is not a valid
-        # argument to callables otherwise anyway.  Worst case here is
-        # that if no eval context is passed we fall back to the compile
-        # time autoescape flag.
-        if args and isinstance(args[0], EvalContext):
-            autoescape = args[0].autoescape
-            args = args[1:]
-        else:
-            autoescape = self._default_autoescape
-
-        # try to consume the positional arguments
-        arguments = list(args[: self._argument_count])
-        off = len(arguments)
-
-        # For information why this is necessary refer to the handling
-        # of caller in the `macro_body` handler in the compiler.
-        found_caller = False
-
-        # if the number of arguments consumed is not the number of
-        # arguments expected we start filling in keyword arguments
-        # and defaults.
-        if off != self._argument_count:
-            for name in self.arguments[len(arguments) :]:
-                try:
-                    value = kwargs.pop(name)
-                except KeyError:
-                    value = missing
-                if name == "caller":
-                    found_caller = True
-                arguments.append(value)
-        else:
-            found_caller = self.explicit_caller
-
-        # it's important that the order of these arguments does not change
-        # if not also changed in the compiler's `function_scoping` method.
-        # the order is caller, keyword arguments, positional arguments!
-        if self.caller and not found_caller:
-            caller = kwargs.pop("caller", None)
-            if caller is None:
-                caller = self._environment.undefined("No caller defined", name="caller")
-            arguments.append(caller)
-
-        if self.catch_kwargs:
-            arguments.append(kwargs)
-        elif kwargs:
-            if "caller" in kwargs:
-                raise TypeError(
-                    f"macro {self.name!r} was invoked with two values for the special"
-                    " caller argument. This is most likely a bug."
-                )
-            raise TypeError(
-                f"macro {self.name!r} takes no keyword argument {next(iter(kwargs))!r}"
-            )
-        if self.catch_varargs:
-            arguments.append(args[self._argument_count :])
-        elif len(args) > self._argument_count:
-            raise TypeError(
-                f"macro {self.name!r} takes not more than"
-                f" {len(self.arguments)} argument(s)"
-            )
-
-        return self._invoke(arguments, autoescape)
-
-    def _invoke(self, arguments, autoescape):
-        """This method is being swapped out by the async implementation."""
-        rv = self._func(*arguments)
-        if autoescape:
-            rv = Markup(rv)
-        return rv
-
-    def __repr__(self):
-        name = "anonymous" if self.name is None else repr(self.name)
-        return f"<{self.__class__.__name__} {name}>"
-
-
-class Undefined:
-    """The default undefined type.  This undefined type can be printed and
-    iterated over, but every other access will raise an :exc:`UndefinedError`:
-
-    >>> foo = Undefined(name='foo')
-    >>> str(foo)
-    ''
-    >>> not foo
-    True
-    >>> foo + 42
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-    """
-
-    __slots__ = (
-        "_undefined_hint",
-        "_undefined_obj",
-        "_undefined_name",
-        "_undefined_exception",
-    )
-
-    def __init__(self, hint=None, obj=missing, name=None, exc=UndefinedError):
-        self._undefined_hint = hint
-        self._undefined_obj = obj
-        self._undefined_name = name
-        self._undefined_exception = exc
-
-    @property
-    def _undefined_message(self):
-        """Build a message about the undefined value based on how it was
-        accessed.
-        """
-        if self._undefined_hint:
-            return self._undefined_hint
-
-        if self._undefined_obj is missing:
-            return f"{self._undefined_name!r} is undefined"
-
-        if not isinstance(self._undefined_name, str):
-            return (
-                f"{object_type_repr(self._undefined_obj)} has no"
-                f" element {self._undefined_name!r}"
-            )
-
-        return (
-            f"{object_type_repr(self._undefined_obj)!r} has no"
-            f" attribute {self._undefined_name!r}"
-        )
-
-    @internalcode
-    def _fail_with_undefined_error(self, *args, **kwargs):
-        """Raise an :exc:`UndefinedError` when operations are performed
-        on the undefined value.
-        """
-        raise self._undefined_exception(self._undefined_message)
-
-    @internalcode
-    def __getattr__(self, name):
-        if name[:2] == "__":
-            raise AttributeError(name)
-        return self._fail_with_undefined_error()
-
-    __add__ = __radd__ = __sub__ = __rsub__ = _fail_with_undefined_error
-    __mul__ = __rmul__ = __div__ = __rdiv__ = _fail_with_undefined_error
-    __truediv__ = __rtruediv__ = _fail_with_undefined_error
-    __floordiv__ = __rfloordiv__ = _fail_with_undefined_error
-    __mod__ = __rmod__ = _fail_with_undefined_error
-    __pos__ = __neg__ = _fail_with_undefined_error
-    __call__ = __getitem__ = _fail_with_undefined_error
-    __lt__ = __le__ = __gt__ = __ge__ = _fail_with_undefined_error
-    __int__ = __float__ = __complex__ = _fail_with_undefined_error
-    __pow__ = __rpow__ = _fail_with_undefined_error
-
-    def __eq__(self, other):
-        return type(self) is type(other)
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
-
-    def __hash__(self):
-        return id(type(self))
-
-    def __str__(self):
-        return ""
-
-    def __len__(self):
-        return 0
-
-    def __iter__(self):
-        if 0:
-            yield None
-
-    def __bool__(self):
-        return False
-
-    def __repr__(self):
-        return "Undefined"
-
-
-def make_logging_undefined(logger=None, base=None):
-    """Given a logger object this returns a new undefined class that will
-    log certain failures.  It will log iterations and printing.  If no
-    logger is given a default logger is created.
-
-    Example::
-
-        logger = logging.getLogger(__name__)
-        LoggingUndefined = make_logging_undefined(
-            logger=logger,
-            base=Undefined
-        )
-
-    .. versionadded:: 2.8
-
-    :param logger: the logger to use.  If not provided, a default logger
-                   is created.
-    :param base: the base class to add logging functionality to.  This
-                 defaults to :class:`Undefined`.
-    """
-    if logger is None:
-        import logging
-
-        logger = logging.getLogger(__name__)
-        logger.addHandler(logging.StreamHandler(sys.stderr))
-    if base is None:
-        base = Undefined
-
-    def _log_message(undef):
-        logger.warning("Template variable warning: %s", undef._undefined_message)
-
-    class LoggingUndefined(base):
-        def _fail_with_undefined_error(self, *args, **kwargs):
-            try:
-                return super()._fail_with_undefined_error(*args, **kwargs)
-            except self._undefined_exception as e:
-                logger.error(f"Template variable error: %s", e)
-                raise e
-
-        def __str__(self):
-            _log_message(self)
-            return super().__str__()
-
-        def __iter__(self):
-            _log_message(self)
-            return super().__iter__()
-
-        def __bool__(self):
-            _log_message(self)
-            return super().__bool__()
-
-    return LoggingUndefined
-
-
-class ChainableUndefined(Undefined):
-    """An undefined that is chainable, where both ``__getattr__`` and
-    ``__getitem__`` return itself rather than raising an
-    :exc:`UndefinedError`.
-
-    >>> foo = ChainableUndefined(name='foo')
-    >>> str(foo.bar['baz'])
-    ''
-    >>> foo.bar['baz'] + 42
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-
-    .. versionadded:: 2.11.0
-    """
-
-    __slots__ = ()
-
-    def __html__(self):
-        return self.__str__()
-
-    def __getattr__(self, _):
-        return self
-
-    __getitem__ = __getattr__
-
-
-class DebugUndefined(Undefined):
-    """An undefined that returns the debug info when printed.
-
-    >>> foo = DebugUndefined(name='foo')
-    >>> str(foo)
-    '{{ foo }}'
-    >>> not foo
-    True
-    >>> foo + 42
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-    """
-
-    __slots__ = ()
-
-    def __str__(self):
-        if self._undefined_hint:
-            message = f"undefined value printed: {self._undefined_hint}"
-
-        elif self._undefined_obj is missing:
-            message = self._undefined_name
-
-        else:
-            message = (
-                f"no such element: {object_type_repr(self._undefined_obj)}"
-                f"[{self._undefined_name!r}]"
-            )
-
-        return f"{{{{ {message} }}}}"
-
-
-class StrictUndefined(Undefined):
-    """An undefined that barks on print and iteration as well as boolean
-    tests and all kinds of comparisons.  In other words: you can do nothing
-    with it except checking if it's defined using the `defined` test.
-
-    >>> foo = StrictUndefined(name='foo')
-    >>> str(foo)
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-    >>> not foo
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-    >>> foo + 42
-    Traceback (most recent call last):
-      ...
-    jinja2.exceptions.UndefinedError: 'foo' is undefined
-    """
-
-    __slots__ = ()
-    __iter__ = __str__ = __len__ = Undefined._fail_with_undefined_error
-    __eq__ = __ne__ = __bool__ = __hash__ = Undefined._fail_with_undefined_error
-
-
-# Remove slots attributes, after the metaclass is applied they are
-# unneeded and contain wrong data for subclasses.
-del (
-    Undefined.__slots__,
-    ChainableUndefined.__slots__,
-    DebugUndefined.__slots__,
-    StrictUndefined.__slots__,
-)
diff --git a/src/jinja2/sandbox.py b/src/jinja2/sandbox.py
deleted file mode 100644
index 5c6d0946..00000000
--- a/src/jinja2/sandbox.py
+++ /dev/null
@@ -1,419 +0,0 @@
-"""A sandbox layer that ensures unsafe operations cannot be performed.
-Useful when the template itself comes from an untrusted source.
-"""
-import operator
-import types
-from _string import formatter_field_name_split
-from collections import abc
-from collections import deque
-from string import Formatter
-
-from markupsafe import EscapeFormatter
-from markupsafe import Markup
-
-from .environment import Environment
-from .exceptions import SecurityError
-
-#: maximum number of items a range may produce
-MAX_RANGE = 100000
-
-#: Unsafe function attributes.
-UNSAFE_FUNCTION_ATTRIBUTES = set()
-
-#: Unsafe method attributes. Function attributes are unsafe for methods too.
-UNSAFE_METHOD_ATTRIBUTES = set()
-
-#: unsafe generator attributes.
-UNSAFE_GENERATOR_ATTRIBUTES = {"gi_frame", "gi_code"}
-
-#: unsafe attributes on coroutines
-UNSAFE_COROUTINE_ATTRIBUTES = {"cr_frame", "cr_code"}
-
-#: unsafe attributes on async generators
-UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = {"ag_code", "ag_frame"}
-
-_mutable_spec = (
-    (
-        abc.MutableSet,
-        frozenset(
-            [
-                "add",
-                "clear",
-                "difference_update",
-                "discard",
-                "pop",
-                "remove",
-                "symmetric_difference_update",
-                "update",
-            ]
-        ),
-    ),
-    (
-        abc.MutableMapping,
-        frozenset(["clear", "pop", "popitem", "setdefault", "update"]),
-    ),
-    (
-        abc.MutableSequence,
-        frozenset(["append", "reverse", "insert", "sort", "extend", "remove"]),
-    ),
-    (
-        deque,
-        frozenset(
-            [
-                "append",
-                "appendleft",
-                "clear",
-                "extend",
-                "extendleft",
-                "pop",
-                "popleft",
-                "remove",
-                "rotate",
-            ]
-        ),
-    ),
-)
-
-
-def inspect_format_method(callable):
-    if not isinstance(
-        callable, (types.MethodType, types.BuiltinMethodType)
-    ) or callable.__name__ not in ("format", "format_map"):
-        return None
-    obj = callable.__self__
-    if isinstance(obj, str):
-        return obj
-
-
-def safe_range(*args):
-    """A range that can't generate ranges with a length of more than
-    MAX_RANGE items.
-    """
-    rng = range(*args)
-
-    if len(rng) > MAX_RANGE:
-        raise OverflowError(
-            "Range too big. The sandbox blocks ranges larger than"
-            f" MAX_RANGE ({MAX_RANGE})."
-        )
-
-    return rng
-
-
-def unsafe(f):
-    """Marks a function or method as unsafe.
-
-    .. code-block: python
-
-        @unsafe
-        def delete(self):
-            pass
-    """
-    f.unsafe_callable = True
-    return f
-
-
-def is_internal_attribute(obj, attr):
-    """Test if the attribute given is an internal python attribute.  For
-    example this function returns `True` for the `func_code` attribute of
-    python objects.  This is useful if the environment method
-    :meth:`~SandboxedEnvironment.is_safe_attribute` is overridden.
-
-    >>> from jinja2.sandbox import is_internal_attribute
-    >>> is_internal_attribute(str, "mro")
-    True
-    >>> is_internal_attribute(str, "upper")
-    False
-    """
-    if isinstance(obj, types.FunctionType):
-        if attr in UNSAFE_FUNCTION_ATTRIBUTES:
-            return True
-    elif isinstance(obj, types.MethodType):
-        if attr in UNSAFE_FUNCTION_ATTRIBUTES or attr in UNSAFE_METHOD_ATTRIBUTES:
-            return True
-    elif isinstance(obj, type):
-        if attr == "mro":
-            return True
-    elif isinstance(obj, (types.CodeType, types.TracebackType, types.FrameType)):
-        return True
-    elif isinstance(obj, types.GeneratorType):
-        if attr in UNSAFE_GENERATOR_ATTRIBUTES:
-            return True
-    elif hasattr(types, "CoroutineType") and isinstance(obj, types.CoroutineType):
-        if attr in UNSAFE_COROUTINE_ATTRIBUTES:
-            return True
-    elif hasattr(types, "AsyncGeneratorType") and isinstance(
-        obj, types.AsyncGeneratorType
-    ):
-        if attr in UNSAFE_ASYNC_GENERATOR_ATTRIBUTES:
-            return True
-    return attr.startswith("__")
-
-
-def modifies_known_mutable(obj, attr):
-    """This function checks if an attribute on a builtin mutable object
-    (list, dict, set or deque) or the corresponding ABCs would modify it
-    if called.
-
-    >>> modifies_known_mutable({}, "clear")
-    True
-    >>> modifies_known_mutable({}, "keys")
-    False
-    >>> modifies_known_mutable([], "append")
-    True
-    >>> modifies_known_mutable([], "index")
-    False
-
-    If called with an unsupported object, ``False`` is returned.
-
-    >>> modifies_known_mutable("foo", "upper")
-    False
-    """
-    for typespec, unsafe in _mutable_spec:
-        if isinstance(obj, typespec):
-            return attr in unsafe
-    return False
-
-
-class SandboxedEnvironment(Environment):
-    """The sandboxed environment.  It works like the regular environment but
-    tells the compiler to generate sandboxed code.  Additionally subclasses of
-    this environment may override the methods that tell the runtime what
-    attributes or functions are safe to access.
-
-    If the template tries to access insecure code a :exc:`SecurityError` is
-    raised.  However also other exceptions may occur during the rendering so
-    the caller has to ensure that all exceptions are caught.
-    """
-
-    sandboxed = True
-
-    #: default callback table for the binary operators.  A copy of this is
-    #: available on each instance of a sandboxed environment as
-    #: :attr:`binop_table`
-    default_binop_table = {
-        "+": operator.add,
-        "-": operator.sub,
-        "*": operator.mul,
-        "/": operator.truediv,
-        "//": operator.floordiv,
-        "**": operator.pow,
-        "%": operator.mod,
-    }
-
-    #: default callback table for the unary operators.  A copy of this is
-    #: available on each instance of a sandboxed environment as
-    #: :attr:`unop_table`
-    default_unop_table = {"+": operator.pos, "-": operator.neg}
-
-    #: a set of binary operators that should be intercepted.  Each operator
-    #: that is added to this set (empty by default) is delegated to the
-    #: :meth:`call_binop` method that will perform the operator.  The default
-    #: operator callback is specified by :attr:`binop_table`.
-    #:
-    #: The following binary operators are interceptable:
-    #: ``//``, ``%``, ``+``, ``*``, ``-``, ``/``, and ``**``
-    #:
-    #: The default operation form the operator table corresponds to the
-    #: builtin function.  Intercepted calls are always slower than the native
-    #: operator call, so make sure only to intercept the ones you are
-    #: interested in.
-    #:
-    #: .. versionadded:: 2.6
-    intercepted_binops = frozenset()
-
-    #: a set of unary operators that should be intercepted.  Each operator
-    #: that is added to this set (empty by default) is delegated to the
-    #: :meth:`call_unop` method that will perform the operator.  The default
-    #: operator callback is specified by :attr:`unop_table`.
-    #:
-    #: The following unary operators are interceptable: ``+``, ``-``
-    #:
-    #: The default operation form the operator table corresponds to the
-    #: builtin function.  Intercepted calls are always slower than the native
-    #: operator call, so make sure only to intercept the ones you are
-    #: interested in.
-    #:
-    #: .. versionadded:: 2.6
-    intercepted_unops = frozenset()
-
-    def intercept_unop(self, operator):
-        """Called during template compilation with the name of a unary
-        operator to check if it should be intercepted at runtime.  If this
-        method returns `True`, :meth:`call_unop` is executed for this unary
-        operator.  The default implementation of :meth:`call_unop` will use
-        the :attr:`unop_table` dictionary to perform the operator with the
-        same logic as the builtin one.
-
-        The following unary operators are interceptable: ``+`` and ``-``
-
-        Intercepted calls are always slower than the native operator call,
-        so make sure only to intercept the ones you are interested in.
-
-        .. versionadded:: 2.6
-        """
-        return False
-
-    def __init__(self, *args, **kwargs):
-        Environment.__init__(self, *args, **kwargs)
-        self.globals["range"] = safe_range
-        self.binop_table = self.default_binop_table.copy()
-        self.unop_table = self.default_unop_table.copy()
-
-    def is_safe_attribute(self, obj, attr, value):
-        """The sandboxed environment will call this method to check if the
-        attribute of an object is safe to access.  Per default all attributes
-        starting with an underscore are considered private as well as the
-        special attributes of internal python objects as returned by the
-        :func:`is_internal_attribute` function.
-        """
-        return not (attr.startswith("_") or is_internal_attribute(obj, attr))
-
-    def is_safe_callable(self, obj):
-        """Check if an object is safely callable.  Per default a function is
-        considered safe unless the `unsafe_callable` attribute exists and is
-        True.  Override this method to alter the behavior, but this won't
-        affect the `unsafe` decorator from this module.
-        """
-        return not (
-            getattr(obj, "unsafe_callable", False) or getattr(obj, "alters_data", False)
-        )
-
-    def call_binop(self, context, operator, left, right):
-        """For intercepted binary operator calls (:meth:`intercepted_binops`)
-        this function is executed instead of the builtin operator.  This can
-        be used to fine tune the behavior of certain operators.
-
-        .. versionadded:: 2.6
-        """
-        return self.binop_table[operator](left, right)
-
-    def call_unop(self, context, operator, arg):
-        """For intercepted unary operator calls (:meth:`intercepted_unops`)
-        this function is executed instead of the builtin operator.  This can
-        be used to fine tune the behavior of certain operators.
-
-        .. versionadded:: 2.6
-        """
-        return self.unop_table[operator](arg)
-
-    def getitem(self, obj, argument):
-        """Subscribe an object from sandboxed code."""
-        try:
-            return obj[argument]
-        except (TypeError, LookupError):
-            if isinstance(argument, str):
-                try:
-                    attr = str(argument)
-                except Exception:
-                    pass
-                else:
-                    try:
-                        value = getattr(obj, attr)
-                    except AttributeError:
-                        pass
-                    else:
-                        if self.is_safe_attribute(obj, argument, value):
-                            return value
-                        return self.unsafe_undefined(obj, argument)
-        return self.undefined(obj=obj, name=argument)
-
-    def getattr(self, obj, attribute):
-        """Subscribe an object from sandboxed code and prefer the
-        attribute.  The attribute passed *must* be a bytestring.
-        """
-        try:
-            value = getattr(obj, attribute)
-        except AttributeError:
-            try:
-                return obj[attribute]
-            except (TypeError, LookupError):
-                pass
-        else:
-            if self.is_safe_attribute(obj, attribute, value):
-                return value
-            return self.unsafe_undefined(obj, attribute)
-        return self.undefined(obj=obj, name=attribute)
-
-    def unsafe_undefined(self, obj, attribute):
-        """Return an undefined object for unsafe attributes."""
-        return self.undefined(
-            f"access to attribute {attribute!r} of"
-            f" {obj.__class__.__name__!r} object is unsafe.",
-            name=attribute,
-            obj=obj,
-            exc=SecurityError,
-        )
-
-    def format_string(self, s, args, kwargs, format_func=None):
-        """If a format call is detected, then this is routed through this
-        method so that our safety sandbox can be used for it.
-        """
-        if isinstance(s, Markup):
-            formatter = SandboxedEscapeFormatter(self, s.escape)
-        else:
-            formatter = SandboxedFormatter(self)
-
-        if format_func is not None and format_func.__name__ == "format_map":
-            if len(args) != 1 or kwargs:
-                raise TypeError(
-                    "format_map() takes exactly one argument"
-                    f" {len(args) + (kwargs is not None)} given"
-                )
-
-            kwargs = args[0]
-            args = None
-
-        rv = formatter.vformat(s, args, kwargs)
-        return type(s)(rv)
-
-    def call(__self, __context, __obj, *args, **kwargs):  # noqa: B902
-        """Call an object from sandboxed code."""
-        fmt = inspect_format_method(__obj)
-        if fmt is not None:
-            return __self.format_string(fmt, args, kwargs, __obj)
-
-        # the double prefixes are to avoid double keyword argument
-        # errors when proxying the call.
-        if not __self.is_safe_callable(__obj):
-            raise SecurityError(f"{__obj!r} is not safely callable")
-        return __context.call(__obj, *args, **kwargs)
-
-
-class ImmutableSandboxedEnvironment(SandboxedEnvironment):
-    """Works exactly like the regular `SandboxedEnvironment` but does not
-    permit modifications on the builtin mutable objects `list`, `set`, and
-    `dict` by using the :func:`modifies_known_mutable` function.
-    """
-
-    def is_safe_attribute(self, obj, attr, value):
-        if not SandboxedEnvironment.is_safe_attribute(self, obj, attr, value):
-            return False
-        return not modifies_known_mutable(obj, attr)
-
-
-class SandboxedFormatterMixin:
-    def __init__(self, env):
-        self._env = env
-
-    def get_field(self, field_name, args, kwargs):
-        first, rest = formatter_field_name_split(field_name)
-        obj = self.get_value(first, args, kwargs)
-        for is_attr, i in rest:
-            if is_attr:
-                obj = self._env.getattr(obj, i)
-            else:
-                obj = self._env.getitem(obj, i)
-        return obj, first
-
-
-class SandboxedFormatter(SandboxedFormatterMixin, Formatter):
-    def __init__(self, env):
-        SandboxedFormatterMixin.__init__(self, env)
-        Formatter.__init__(self)
-
-
-class SandboxedEscapeFormatter(SandboxedFormatterMixin, EscapeFormatter):
-    def __init__(self, env, escape):
-        SandboxedFormatterMixin.__init__(self, env)
-        EscapeFormatter.__init__(self, escape)
diff --git a/src/jinja2/tests.py b/src/jinja2/tests.py
deleted file mode 100644
index bc763268..00000000
--- a/src/jinja2/tests.py
+++ /dev/null
@@ -1,211 +0,0 @@
-"""Built-in template tests used with the ``is`` operator."""
-import operator
-import re
-from collections import abc
-from numbers import Number
-
-from .runtime import Undefined
-
-number_re = re.compile(r"^-?\d+(\.\d+)?$")
-regex_type = type(number_re)
-test_callable = callable
-
-
-def test_odd(value):
-    """Return true if the variable is odd."""
-    return value % 2 == 1
-
-
-def test_even(value):
-    """Return true if the variable is even."""
-    return value % 2 == 0
-
-
-def test_divisibleby(value, num):
-    """Check if a variable is divisible by a number."""
-    return value % num == 0
-
-
-def test_defined(value):
-    """Return true if the variable is defined:
-
-    .. sourcecode:: jinja
-
-        {% if variable is defined %}
-            value of variable: {{ variable }}
-        {% else %}
-            variable is not defined
-        {% endif %}
-
-    See the :func:`default` filter for a simple way to set undefined
-    variables.
-    """
-    return not isinstance(value, Undefined)
-
-
-def test_undefined(value):
-    """Like :func:`defined` but the other way round."""
-    return isinstance(value, Undefined)
-
-
-def test_none(value):
-    """Return true if the variable is none."""
-    return value is None
-
-
-def test_boolean(value):
-    """Return true if the object is a boolean value.
-
-    .. versionadded:: 2.11
-    """
-    return value is True or value is False
-
-
-def test_false(value):
-    """Return true if the object is False.
-
-    .. versionadded:: 2.11
-    """
-    return value is False
-
-
-def test_true(value):
-    """Return true if the object is True.
-
-    .. versionadded:: 2.11
-    """
-    return value is True
-
-
-# NOTE: The existing 'number' test matches booleans and floats
-def test_integer(value):
-    """Return true if the object is an integer.
-
-    .. versionadded:: 2.11
-    """
-    return isinstance(value, int) and value is not True and value is not False
-
-
-# NOTE: The existing 'number' test matches booleans and integers
-def test_float(value):
-    """Return true if the object is a float.
-
-    .. versionadded:: 2.11
-    """
-    return isinstance(value, float)
-
-
-def test_lower(value):
-    """Return true if the variable is lowercased."""
-    return str(value).islower()
-
-
-def test_upper(value):
-    """Return true if the variable is uppercased."""
-    return str(value).isupper()
-
-
-def test_string(value):
-    """Return true if the object is a string."""
-    return isinstance(value, str)
-
-
-def test_mapping(value):
-    """Return true if the object is a mapping (dict etc.).
-
-    .. versionadded:: 2.6
-    """
-    return isinstance(value, abc.Mapping)
-
-
-def test_number(value):
-    """Return true if the variable is a number."""
-    return isinstance(value, Number)
-
-
-def test_sequence(value):
-    """Return true if the variable is a sequence. Sequences are variables
-    that are iterable.
-    """
-    try:
-        len(value)
-        value.__getitem__
-    except Exception:
-        return False
-    return True
-
-
-def test_sameas(value, other):
-    """Check if an object points to the same memory address than another
-    object:
-
-    .. sourcecode:: jinja
-
-        {% if foo.attribute is sameas false %}
-            the foo attribute really is the `False` singleton
-        {% endif %}
-    """
-    return value is other
-
-
-def test_iterable(value):
-    """Check if it's possible to iterate over an object."""
-    try:
-        iter(value)
-    except TypeError:
-        return False
-    return True
-
-
-def test_escaped(value):
-    """Check if the value is escaped."""
-    return hasattr(value, "__html__")
-
-
-def test_in(value, seq):
-    """Check if value is in seq.
-
-    .. versionadded:: 2.10
-    """
-    return value in seq
-
-
-TESTS = {
-    "odd": test_odd,
-    "even": test_even,
-    "divisibleby": test_divisibleby,
-    "defined": test_defined,
-    "undefined": test_undefined,
-    "none": test_none,
-    "boolean": test_boolean,
-    "false": test_false,
-    "true": test_true,
-    "integer": test_integer,
-    "float": test_float,
-    "lower": test_lower,
-    "upper": test_upper,
-    "string": test_string,
-    "mapping": test_mapping,
-    "number": test_number,
-    "sequence": test_sequence,
-    "iterable": test_iterable,
-    "callable": test_callable,
-    "sameas": test_sameas,
-    "escaped": test_escaped,
-    "in": test_in,
-    "==": operator.eq,
-    "eq": operator.eq,
-    "equalto": operator.eq,
-    "!=": operator.ne,
-    "ne": operator.ne,
-    ">": operator.gt,
-    "gt": operator.gt,
-    "greaterthan": operator.gt,
-    "ge": operator.ge,
-    ">=": operator.ge,
-    "<": operator.lt,
-    "lt": operator.lt,
-    "lessthan": operator.lt,
-    "<=": operator.le,
-    "le": operator.le,
-}
diff --git a/src/jinja2/utils.py b/src/jinja2/utils.py
deleted file mode 100644
index 8ee02958..00000000
--- a/src/jinja2/utils.py
+++ /dev/null
@@ -1,666 +0,0 @@
-import json
-import os
-import re
-from collections import abc
-from collections import deque
-from random import choice
-from random import randrange
-from threading import Lock
-from urllib.parse import quote_from_bytes
-
-from markupsafe import escape
-from markupsafe import Markup
-
-_word_split_re = re.compile(r"(\s+)")
-_lead_pattern = "|".join(map(re.escape, ("(", "<", "&lt;")))
-_trail_pattern = "|".join(map(re.escape, (".", ",", ")", ">", "\n", "&gt;")))
-_punctuation_re = re.compile(
-    fr"^(?P<lead>(?:{_lead_pattern})*)(?P<middle>.*?)(?P<trail>(?:{_trail_pattern})*)$"
-)
-_simple_email_re = re.compile(r"^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$")
-_striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
-_entity_re = re.compile(r"&([^;]+);")
-_letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
-_digits = "0123456789"
-
-# special singleton representing missing values for the runtime
-missing = type("MissingType", (), {"__repr__": lambda x: "missing"})()
-
-# internal code
-internal_code = set()
-
-concat = "".join
-
-_slash_escape = "\\/" not in json.dumps("/")
-
-
-def contextfunction(f):
-    """This decorator can be used to mark a function or method context callable.
-    A context callable is passed the active :class:`Context` as first argument when
-    called from the template.  This is useful if a function wants to get access
-    to the context or functions provided on the context object.  For example
-    a function that returns a sorted list of template variables the current
-    template exports could look like this::
-
-        @contextfunction
-        def get_exported_names(context):
-            return sorted(context.exported_vars)
-    """
-    f.contextfunction = True
-    return f
-
-
-def evalcontextfunction(f):
-    """This decorator can be used to mark a function or method as an eval
-    context callable.  This is similar to the :func:`contextfunction`
-    but instead of passing the context, an evaluation context object is
-    passed.  For more information about the eval context, see
-    :ref:`eval-context`.
-
-    .. versionadded:: 2.4
-    """
-    f.evalcontextfunction = True
-    return f
-
-
-def environmentfunction(f):
-    """This decorator can be used to mark a function or method as environment
-    callable.  This decorator works exactly like the :func:`contextfunction`
-    decorator just that the first argument is the active :class:`Environment`
-    and not context.
-    """
-    f.environmentfunction = True
-    return f
-
-
-def internalcode(f):
-    """Marks the function as internally used"""
-    internal_code.add(f.__code__)
-    return f
-
-
-def is_undefined(obj):
-    """Check if the object passed is undefined.  This does nothing more than
-    performing an instance check against :class:`Undefined` but looks nicer.
-    This can be used for custom filters or tests that want to react to
-    undefined variables.  For example a custom default filter can look like
-    this::
-
-        def default(var, default=''):
-            if is_undefined(var):
-                return default
-            return var
-    """
-    from .runtime import Undefined
-
-    return isinstance(obj, Undefined)
-
-
-def consume(iterable):
-    """Consumes an iterable without doing anything with it."""
-    for _ in iterable:
-        pass
-
-
-def clear_caches():
-    """Jinja keeps internal caches for environments and lexers.  These are
-    used so that Jinja doesn't have to recreate environments and lexers all
-    the time.  Normally you don't have to care about that but if you are
-    measuring memory consumption you may want to clean the caches.
-    """
-    from .environment import _spontaneous_environments
-    from .lexer import _lexer_cache
-
-    _spontaneous_environments.clear()
-    _lexer_cache.clear()
-
-
-def import_string(import_name, silent=False):
-    """Imports an object based on a string.  This is useful if you want to
-    use import paths as endpoints or something similar.  An import path can
-    be specified either in dotted notation (``xml.sax.saxutils.escape``)
-    or with a colon as object delimiter (``xml.sax.saxutils:escape``).
-
-    If the `silent` is True the return value will be `None` if the import
-    fails.
-
-    :return: imported object
-    """
-    try:
-        if ":" in import_name:
-            module, obj = import_name.split(":", 1)
-        elif "." in import_name:
-            module, _, obj = import_name.rpartition(".")
-        else:
-            return __import__(import_name)
-        return getattr(__import__(module, None, None, [obj]), obj)
-    except (ImportError, AttributeError):
-        if not silent:
-            raise
-
-
-def open_if_exists(filename, mode="rb"):
-    """Returns a file descriptor for the filename if that file exists,
-    otherwise ``None``.
-    """
-    if not os.path.isfile(filename):
-        return None
-
-    return open(filename, mode)
-
-
-def object_type_repr(obj):
-    """Returns the name of the object's type.  For some recognized
-    singletons the name of the object is returned instead. (For
-    example for `None` and `Ellipsis`).
-    """
-    if obj is None:
-        return "None"
-    elif obj is Ellipsis:
-        return "Ellipsis"
-
-    cls = type(obj)
-
-    if cls.__module__ == "builtins":
-        return f"{cls.__name__} object"
-
-    return f"{cls.__module__}.{cls.__name__} object"
-
-
-def pformat(obj):
-    """Format an object using :func:`pprint.pformat`.
-    """
-    from pprint import pformat
-
-    return pformat(obj)
-
-
-def urlize(text, trim_url_limit=None, rel=None, target=None):
-    """Converts any URLs in text into clickable links. Works on http://,
-    https:// and www. links. Links can have trailing punctuation (periods,
-    commas, close-parens) and leading punctuation (opening parens) and
-    it'll still do the right thing.
-
-    If trim_url_limit is not None, the URLs in link text will be limited
-    to trim_url_limit characters.
-
-    If nofollow is True, the URLs in link text will get a rel="nofollow"
-    attribute.
-
-    If target is not None, a target attribute will be added to the link.
-    """
-
-    def trim_url(x, limit=trim_url_limit):
-        if limit is not None:
-            return x[:limit] + ("..." if len(x) >= limit else "")
-
-        return x
-
-    words = _word_split_re.split(str(escape(text)))
-    rel_attr = f' rel="{escape(rel)}"' if rel else ""
-    target_attr = f' target="{escape(target)}"' if target else ""
-
-    for i, word in enumerate(words):
-        match = _punctuation_re.match(word)
-        if match:
-            lead, middle, trail = match.groups()
-            if middle.startswith("www.") or (
-                "@" not in middle
-                and not middle.startswith("http://")
-                and not middle.startswith("https://")
-                and len(middle) > 0
-                and middle[0] in _letters + _digits
-                and (
-                    middle.endswith(".org")
-                    or middle.endswith(".net")
-                    or middle.endswith(".com")
-                )
-            ):
-                middle = (
-                    f'<a href="http://{middle}"{rel_attr}{target_attr}>'
-                    f"{trim_url(middle)}</a>"
-                )
-            if middle.startswith("http://") or middle.startswith("https://"):
-                middle = (
-                    f'<a href="{middle}"{rel_attr}{target_attr}>{trim_url(middle)}</a>'
-                )
-            if (
-                "@" in middle
-                and not middle.startswith("www.")
-                and ":" not in middle
-                and _simple_email_re.match(middle)
-            ):
-                middle = f'<a href="mailto:{middle}">{middle}</a>'
-            if lead + middle + trail != word:
-                words[i] = lead + middle + trail
-    return "".join(words)
-
-
-def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
-    """Generate some lorem ipsum for the template."""
-    from .constants import LOREM_IPSUM_WORDS
-
-    words = LOREM_IPSUM_WORDS.split()
-    result = []
-
-    for _ in range(n):
-        next_capitalized = True
-        last_comma = last_fullstop = 0
-        word = None
-        last = None
-        p = []
-
-        # each paragraph contains out of 20 to 100 words.
-        for idx, _ in enumerate(range(randrange(min, max))):
-            while True:
-                word = choice(words)
-                if word != last:
-                    last = word
-                    break
-            if next_capitalized:
-                word = word.capitalize()
-                next_capitalized = False
-            # add commas
-            if idx - randrange(3, 8) > last_comma:
-                last_comma = idx
-                last_fullstop += 2
-                word += ","
-            # add end of sentences
-            if idx - randrange(10, 20) > last_fullstop:
-                last_comma = last_fullstop = idx
-                word += "."
-                next_capitalized = True
-            p.append(word)
-
-        # ensure that the paragraph ends with a dot.
-        p = " ".join(p)
-        if p.endswith(","):
-            p = p[:-1] + "."
-        elif not p.endswith("."):
-            p += "."
-        result.append(p)
-
-    if not html:
-        return "\n\n".join(result)
-    return Markup("\n".join(f"<p>{escape(x)}</p>" for x in result))
-
-
-def url_quote(obj, charset="utf-8", for_qs=False):
-    """Quote a string for use in a URL using the given charset.
-
-    This function is misnamed, it is a wrapper around
-    :func:`urllib.parse.quote`.
-
-    :param obj: String or bytes to quote. Other types are converted to
-        string then encoded to bytes using the given charset.
-    :param charset: Encode text to bytes using this charset.
-    :param for_qs: Quote "/" and use "+" for spaces.
-    """
-    if not isinstance(obj, bytes):
-        if not isinstance(obj, str):
-            obj = str(obj)
-
-        obj = obj.encode(charset)
-
-    safe = b"" if for_qs else b"/"
-    rv = quote_from_bytes(obj, safe)
-
-    if for_qs:
-        rv = rv.replace("%20", "+")
-
-    return rv
-
-
-def unicode_urlencode(obj, charset="utf-8", for_qs=False):
-    import warnings
-
-    warnings.warn(
-        "'unicode_urlencode' has been renamed to 'url_quote'. The old"
-        " name will be removed in version 3.1.",
-        DeprecationWarning,
-        stacklevel=2,
-    )
-    return url_quote(obj, charset=charset, for_qs=for_qs)
-
-
-@abc.MutableMapping.register
-class LRUCache:
-    """A simple LRU Cache implementation."""
-
-    # this is fast for small capacities (something below 1000) but doesn't
-    # scale.  But as long as it's only used as storage for templates this
-    # won't do any harm.
-
-    def __init__(self, capacity):
-        self.capacity = capacity
-        self._mapping = {}
-        self._queue = deque()
-        self._postinit()
-
-    def _postinit(self):
-        # alias all queue methods for faster lookup
-        self._popleft = self._queue.popleft
-        self._pop = self._queue.pop
-        self._remove = self._queue.remove
-        self._wlock = Lock()
-        self._append = self._queue.append
-
-    def __getstate__(self):
-        return {
-            "capacity": self.capacity,
-            "_mapping": self._mapping,
-            "_queue": self._queue,
-        }
-
-    def __setstate__(self, d):
-        self.__dict__.update(d)
-        self._postinit()
-
-    def __getnewargs__(self):
-        return (self.capacity,)
-
-    def copy(self):
-        """Return a shallow copy of the instance."""
-        rv = self.__class__(self.capacity)
-        rv._mapping.update(self._mapping)
-        rv._queue.extend(self._queue)
-        return rv
-
-    def get(self, key, default=None):
-        """Return an item from the cache dict or `default`"""
-        try:
-            return self[key]
-        except KeyError:
-            return default
-
-    def setdefault(self, key, default=None):
-        """Set `default` if the key is not in the cache otherwise
-        leave unchanged. Return the value of this key.
-        """
-        try:
-            return self[key]
-        except KeyError:
-            self[key] = default
-            return default
-
-    def clear(self):
-        """Clear the cache."""
-        self._wlock.acquire()
-        try:
-            self._mapping.clear()
-            self._queue.clear()
-        finally:
-            self._wlock.release()
-
-    def __contains__(self, key):
-        """Check if a key exists in this cache."""
-        return key in self._mapping
-
-    def __len__(self):
-        """Return the current size of the cache."""
-        return len(self._mapping)
-
-    def __repr__(self):
-        return f"<{self.__class__.__name__} {self._mapping!r}>"
-
-    def __getitem__(self, key):
-        """Get an item from the cache. Moves the item up so that it has the
-        highest priority then.
-
-        Raise a `KeyError` if it does not exist.
-        """
-        self._wlock.acquire()
-        try:
-            rv = self._mapping[key]
-            if self._queue[-1] != key:
-                try:
-                    self._remove(key)
-                except ValueError:
-                    # if something removed the key from the container
-                    # when we read, ignore the ValueError that we would
-                    # get otherwise.
-                    pass
-                self._append(key)
-            return rv
-        finally:
-            self._wlock.release()
-
-    def __setitem__(self, key, value):
-        """Sets the value for an item. Moves the item up so that it
-        has the highest priority then.
-        """
-        self._wlock.acquire()
-        try:
-            if key in self._mapping:
-                self._remove(key)
-            elif len(self._mapping) == self.capacity:
-                del self._mapping[self._popleft()]
-            self._append(key)
-            self._mapping[key] = value
-        finally:
-            self._wlock.release()
-
-    def __delitem__(self, key):
-        """Remove an item from the cache dict.
-        Raise a `KeyError` if it does not exist.
-        """
-        self._wlock.acquire()
-        try:
-            del self._mapping[key]
-            try:
-                self._remove(key)
-            except ValueError:
-                pass
-        finally:
-            self._wlock.release()
-
-    def items(self):
-        """Return a list of items."""
-        result = [(key, self._mapping[key]) for key in list(self._queue)]
-        result.reverse()
-        return result
-
-    def values(self):
-        """Return a list of all values."""
-        return [x[1] for x in self.items()]
-
-    def keys(self):
-        """Return a list of all keys ordered by most recent usage."""
-        return list(self)
-
-    def __iter__(self):
-        return reversed(tuple(self._queue))
-
-    def __reversed__(self):
-        """Iterate over the keys in the cache dict, oldest items
-        coming first.
-        """
-        return iter(tuple(self._queue))
-
-    __copy__ = copy
-
-
-def select_autoescape(
-    enabled_extensions=("html", "htm", "xml"),
-    disabled_extensions=(),
-    default_for_string=True,
-    default=False,
-):
-    """Intelligently sets the initial value of autoescaping based on the
-    filename of the template.  This is the recommended way to configure
-    autoescaping if you do not want to write a custom function yourself.
-
-    If you want to enable it for all templates created from strings or
-    for all templates with `.html` and `.xml` extensions::
-
-        from jinja2 import Environment, select_autoescape
-        env = Environment(autoescape=select_autoescape(
-            enabled_extensions=('html', 'xml'),
-            default_for_string=True,
-        ))
-
-    Example configuration to turn it on at all times except if the template
-    ends with `.txt`::
-
-        from jinja2 import Environment, select_autoescape
-        env = Environment(autoescape=select_autoescape(
-            disabled_extensions=('txt',),
-            default_for_string=True,
-            default=True,
-        ))
-
-    The `enabled_extensions` is an iterable of all the extensions that
-    autoescaping should be enabled for.  Likewise `disabled_extensions` is
-    a list of all templates it should be disabled for.  If a template is
-    loaded from a string then the default from `default_for_string` is used.
-    If nothing matches then the initial value of autoescaping is set to the
-    value of `default`.
-
-    For security reasons this function operates case insensitive.
-
-    .. versionadded:: 2.9
-    """
-    enabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in enabled_extensions)
-    disabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in disabled_extensions)
-
-    def autoescape(template_name):
-        if template_name is None:
-            return default_for_string
-        template_name = template_name.lower()
-        if template_name.endswith(enabled_patterns):
-            return True
-        if template_name.endswith(disabled_patterns):
-            return False
-        return default
-
-    return autoescape
-
-
-def htmlsafe_json_dumps(obj, dumper=None, **kwargs):
-    """Works exactly like :func:`dumps` but is safe for use in ``<script>``
-    tags.  It accepts the same arguments and returns a JSON string.  Note that
-    this is available in templates through the ``|tojson`` filter which will
-    also mark the result as safe.  Due to how this function escapes certain
-    characters this is safe even if used outside of ``<script>`` tags.
-
-    The following characters are escaped in strings:
-
-    -   ``<``
-    -   ``>``
-    -   ``&``
-    -   ``'``
-
-    This makes it safe to embed such strings in any place in HTML with the
-    notable exception of double quoted attributes.  In that case single
-    quote your attributes or HTML escape it in addition.
-    """
-    if dumper is None:
-        dumper = json.dumps
-    rv = (
-        dumper(obj, **kwargs)
-        .replace("<", "\\u003c")
-        .replace(">", "\\u003e")
-        .replace("&", "\\u0026")
-        .replace("'", "\\u0027")
-    )
-    return Markup(rv)
-
-
-class Cycler:
-    """Cycle through values by yield them one at a time, then restarting
-    once the end is reached. Available as ``cycler`` in templates.
-
-    Similar to ``loop.cycle``, but can be used outside loops or across
-    multiple loops. For example, render a list of folders and files in a
-    list, alternating giving them "odd" and "even" classes.
-
-    .. code-block:: html+jinja
-
-        {% set row_class = cycler("odd", "even") %}
-        <ul class="browser">
-        {% for folder in folders %}
-          <li class="folder {{ row_class.next() }}">{{ folder }}
-        {% endfor %}
-        {% for file in files %}
-          <li class="file {{ row_class.next() }}">{{ file }}
-        {% endfor %}
-        </ul>
-
-    :param items: Each positional argument will be yielded in the order
-        given for each cycle.
-
-    .. versionadded:: 2.1
-    """
-
-    def __init__(self, *items):
-        if not items:
-            raise RuntimeError("at least one item has to be provided")
-        self.items = items
-        self.pos = 0
-
-    def reset(self):
-        """Resets the current item to the first item."""
-        self.pos = 0
-
-    @property
-    def current(self):
-        """Return the current item. Equivalent to the item that will be
-        returned next time :meth:`next` is called.
-        """
-        return self.items[self.pos]
-
-    def next(self):
-        """Return the current item, then advance :attr:`current` to the
-        next item.
-        """
-        rv = self.current
-        self.pos = (self.pos + 1) % len(self.items)
-        return rv
-
-    __next__ = next
-
-
-class Joiner:
-    """A joining helper for templates."""
-
-    def __init__(self, sep=", "):
-        self.sep = sep
-        self.used = False
-
-    def __call__(self):
-        if not self.used:
-            self.used = True
-            return ""
-        return self.sep
-
-
-class Namespace:
-    """A namespace object that can hold arbitrary attributes.  It may be
-    initialized from a dictionary or with keyword arguments."""
-
-    def __init__(*args, **kwargs):  # noqa: B902
-        self, args = args[0], args[1:]
-        self.__attrs = dict(*args, **kwargs)
-
-    def __getattribute__(self, name):
-        # __class__ is needed for the awaitable check in async mode
-        if name in {"_Namespace__attrs", "__class__"}:
-            return object.__getattribute__(self, name)
-        try:
-            return self.__attrs[name]
-        except KeyError:
-            raise AttributeError(name)
-
-    def __setitem__(self, name, value):
-        self.__attrs[name] = value
-
-    def __repr__(self):
-        return f"<Namespace {self.__attrs!r}>"
-
-
-# does this python version support async for in and async generators?
-try:
-    exec("async def _():\n async for _ in ():\n  yield _")
-    have_async_gen = True
-except SyntaxError:
-    have_async_gen = False
diff --git a/src/jinja2/visitor.py b/src/jinja2/visitor.py
deleted file mode 100644
index 590fa9eb..00000000
--- a/src/jinja2/visitor.py
+++ /dev/null
@@ -1,79 +0,0 @@
-"""API for traversing the AST nodes. Implemented by the compiler and
-meta introspection.
-"""
-from .nodes import Node
-
-
-class NodeVisitor:
-    """Walks the abstract syntax tree and call visitor functions for every
-    node found.  The visitor functions may return values which will be
-    forwarded by the `visit` method.
-
-    Per default the visitor functions for the nodes are ``'visit_'`` +
-    class name of the node.  So a `TryFinally` node visit function would
-    be `visit_TryFinally`.  This behavior can be changed by overriding
-    the `get_visitor` function.  If no visitor function exists for a node
-    (return value `None`) the `generic_visit` visitor is used instead.
-    """
-
-    def get_visitor(self, node):
-        """Return the visitor function for this node or `None` if no visitor
-        exists for this node.  In that case the generic visit function is
-        used instead.
-        """
-        return getattr(self, f"visit_{node.__class__.__name__}", None)
-
-    def visit(self, node, *args, **kwargs):
-        """Visit a node."""
-        f = self.get_visitor(node)
-        if f is not None:
-            return f(node, *args, **kwargs)
-        return self.generic_visit(node, *args, **kwargs)
-
-    def generic_visit(self, node, *args, **kwargs):
-        """Called if no explicit visitor function exists for a node."""
-        for node in node.iter_child_nodes():
-            self.visit(node, *args, **kwargs)
-
-
-class NodeTransformer(NodeVisitor):
-    """Walks the abstract syntax tree and allows modifications of nodes.
-
-    The `NodeTransformer` will walk the AST and use the return value of the
-    visitor functions to replace or remove the old node.  If the return
-    value of the visitor function is `None` the node will be removed
-    from the previous location otherwise it's replaced with the return
-    value.  The return value may be the original node in which case no
-    replacement takes place.
-    """
-
-    def generic_visit(self, node, *args, **kwargs):
-        for field, old_value in node.iter_fields():
-            if isinstance(old_value, list):
-                new_values = []
-                for value in old_value:
-                    if isinstance(value, Node):
-                        value = self.visit(value, *args, **kwargs)
-                        if value is None:
-                            continue
-                        elif not isinstance(value, Node):
-                            new_values.extend(value)
-                            continue
-                    new_values.append(value)
-                old_value[:] = new_values
-            elif isinstance(old_value, Node):
-                new_node = self.visit(old_value, *args, **kwargs)
-                if new_node is None:
-                    delattr(node, field)
-                else:
-                    setattr(node, field, new_node)
-        return node
-
-    def visit_list(self, node, *args, **kwargs):
-        """As transformers may return lists in some places this method
-        can be used to enforce a list as return value.
-        """
-        rv = self.visit(node, *args, **kwargs)
-        if not isinstance(rv, list):
-            rv = [rv]
-        return rv