Remove windows python distribution from repo and add requirements.txt

27 files changed, 0 insertions, 12359 deletions

diff --git a/python/jinja2/__init__.py b/python/jinja2/__init__.py
deleted file mode 100644
index 15e13b6..0000000
--- a/python/jinja2/__init__.py
+++ /dev/null
@@ -1,83 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2
-    ~~~~~~
-
-    Jinja2 is a template engine written in pure Python.  It provides a
-    Django inspired non-XML syntax but supports inline expressions and
-    an optional sandboxed environment.
-
-    Nutshell
-    --------
-
-    Here a small example of a Jinja2 template::
-
-        {% extends 'base.html' %}
-        {% block title %}Memberlist{% endblock %}
-        {% block content %}
-          <ul>
-          {% for user in users %}
-            <li><a href="{{ user.url }}">{{ user.username }}</a></li>
-          {% endfor %}
-          </ul>
-        {% endblock %}
-
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-__docformat__ = 'restructuredtext en'
-__version__ = '2.10.1'
-
-# high level interface
-from jinja2.environment import Environment, Template
-
-# loaders
-from jinja2.loaders import BaseLoader, FileSystemLoader, PackageLoader, \
-     DictLoader, FunctionLoader, PrefixLoader, ChoiceLoader, \
-     ModuleLoader
-
-# bytecode caches
-from jinja2.bccache import BytecodeCache, FileSystemBytecodeCache, \
-     MemcachedBytecodeCache
-
-# undefined types
-from jinja2.runtime import Undefined, DebugUndefined, StrictUndefined, \
-     make_logging_undefined
-
-# exceptions
-from jinja2.exceptions import TemplateError, UndefinedError, \
-     TemplateNotFound, TemplatesNotFound, TemplateSyntaxError, \
-     TemplateAssertionError, TemplateRuntimeError
-
-# decorators and public utilities
-from jinja2.filters import environmentfilter, contextfilter, \
-     evalcontextfilter
-from jinja2.utils import Markup, escape, clear_caches, \
-     environmentfunction, evalcontextfunction, contextfunction, \
-     is_undefined, select_autoescape
-
-__all__ = [
-    'Environment', 'Template', 'BaseLoader', 'FileSystemLoader',
-    'PackageLoader', 'DictLoader', 'FunctionLoader', 'PrefixLoader',
-    'ChoiceLoader', 'BytecodeCache', 'FileSystemBytecodeCache',
-    'MemcachedBytecodeCache', 'Undefined', 'DebugUndefined',
-    'StrictUndefined', 'TemplateError', 'UndefinedError', 'TemplateNotFound',
-    'TemplatesNotFound', 'TemplateSyntaxError', 'TemplateAssertionError',
-    'TemplateRuntimeError',
-    'ModuleLoader', 'environmentfilter', 'contextfilter', 'Markup', 'escape',
-    'environmentfunction', 'contextfunction', 'clear_caches', 'is_undefined',
-    'evalcontextfilter', 'evalcontextfunction', 'make_logging_undefined',
-    'select_autoescape',
-]
-
-
-def _patch_async():
-    from jinja2.utils import have_async_gen
-    if have_async_gen:
-        from jinja2.asyncsupport import patch_all
-        patch_all()
-
-
-_patch_async()
-del _patch_async
diff --git a/python/jinja2/_compat.py b/python/jinja2/_compat.py
deleted file mode 100644
index 61d8530..0000000
--- a/python/jinja2/_compat.py
+++ /dev/null
@@ -1,99 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2._compat
-    ~~~~~~~~~~~~~~
-
-    Some py2/py3 compatibility support based on a stripped down
-    version of six so we don't have to depend on a specific version
-    of it.
-
-    :copyright: Copyright 2013 by the Jinja team, see AUTHORS.
-    :license: BSD, see LICENSE for details.
-"""
-import sys
-
-PY2 = sys.version_info[0] == 2
-PYPY = hasattr(sys, 'pypy_translation_info')
-_identity = lambda x: x
-
-
-if not PY2:
-    unichr = chr
-    range_type = range
-    text_type = str
-    string_types = (str,)
-    integer_types = (int,)
-
-    iterkeys = lambda d: iter(d.keys())
-    itervalues = lambda d: iter(d.values())
-    iteritems = lambda d: iter(d.items())
-
-    import pickle
-    from io import BytesIO, StringIO
-    NativeStringIO = StringIO
-
-    def reraise(tp, value, tb=None):
-        if value.__traceback__ is not tb:
-            raise value.with_traceback(tb)
-        raise value
-
-    ifilter = filter
-    imap = map
-    izip = zip
-    intern = sys.intern
-
-    implements_iterator = _identity
-    implements_to_string = _identity
-    encode_filename = _identity
-
-else:
-    unichr = unichr
-    text_type = unicode
-    range_type = xrange
-    string_types = (str, unicode)
-    integer_types = (int, long)
-
-    iterkeys = lambda d: d.iterkeys()
-    itervalues = lambda d: d.itervalues()
-    iteritems = lambda d: d.iteritems()
-
-    import cPickle as pickle
-    from cStringIO import StringIO as BytesIO, StringIO
-    NativeStringIO = BytesIO
-
-    exec('def reraise(tp, value, tb=None):\n raise tp, value, tb')
-
-    from itertools import imap, izip, ifilter
-    intern = intern
-
-    def implements_iterator(cls):
-        cls.next = cls.__next__
-        del cls.__next__
-        return cls
-
-    def implements_to_string(cls):
-        cls.__unicode__ = cls.__str__
-        cls.__str__ = lambda x: x.__unicode__().encode('utf-8')
-        return cls
-
-    def encode_filename(filename):
-        if isinstance(filename, unicode):
-            return filename.encode('utf-8')
-        return filename
-
-
-def with_metaclass(meta, *bases):
-    """Create a base class with a metaclass."""
-    # This requires a bit of explanation: the basic idea is to make a
-    # dummy metaclass for one level of class instantiation that replaces
-    # itself with the actual metaclass.
-    class metaclass(type):
-        def __new__(cls, name, this_bases, d):
-            return meta(name, bases, d)
-    return type.__new__(metaclass, 'temporary_class', (), {})
-
-
-try:
-    from urllib.parse import quote_from_bytes as url_quote
-except ImportError:
-    from urllib import quote as url_quote
diff --git a/python/jinja2/_identifier.py b/python/jinja2/_identifier.py
deleted file mode 100644
index 2eac35d..0000000
--- a/python/jinja2/_identifier.py
+++ /dev/null
@@ -1,2 +0,0 @@
-# generated by scripts/generate_identifier_pattern.py
-pattern = '·̀-ͯ·҃-֑҇-ׇֽֿׁׂׅׄؐ-ًؚ-ٰٟۖ-ۜ۟-۪ۤۧۨ-ܑۭܰ-݊ަ-ް߫-߳ࠖ-࠙ࠛ-ࠣࠥ-ࠧࠩ-࡙࠭-࡛ࣔ-ࣣ࣡-ःऺ-़ा-ॏ॑-ॗॢॣঁ-ঃ়া-ৄেৈো-্ৗৢৣਁ-ਃ਼ਾ-ੂੇੈੋ-੍ੑੰੱੵઁ-ઃ઼ા-ૅે-ૉો-્ૢૣଁ-ଃ଼ା-ୄେୈୋ-୍ୖୗୢୣஂா-ூெ-ைொ-்ௗఀ-ఃా-ౄె-ైొ-్ౕౖౢౣಁ-ಃ಼ಾ-ೄೆ-ೈೊ-್ೕೖೢೣഁ-ഃാ-ൄെ-ൈൊ-്ൗൢൣංඃ්ා-ුූෘ-ෟෲෳัิ-ฺ็-๎ັິ-ູົຼ່-ໍ༹༘༙༵༷༾༿ཱ-྄྆྇ྍ-ྗྙ-ྼ࿆ါ-ှၖ-ၙၞ-ၠၢ-ၤၧ-ၭၱ-ၴႂ-ႍႏႚ-ႝ፝-፟ᜒ-᜔ᜲ-᜴ᝒᝓᝲᝳ឴-៓៝᠋-᠍ᢅᢆᢩᤠ-ᤫᤰ-᤻ᨗ-ᨛᩕ-ᩞ᩠-᩿᩼᪰-᪽ᬀ-ᬄ᬴-᭄᭫-᭳ᮀ-ᮂᮡ-ᮭ᯦-᯳ᰤ-᰷᳐-᳔᳒-᳨᳭ᳲ-᳴᳸᳹᷀-᷵᷻-᷿‿⁀⁔⃐-⃥⃜⃡-⃰℘℮⳯-⵿⳱ⷠ-〪ⷿ-゙゚〯꙯ꙴ-꙽ꚞꚟ꛰꛱ꠂ꠆ꠋꠣ-ꠧꢀꢁꢴ-ꣅ꣠-꣱ꤦ-꤭ꥇ-꥓ꦀ-ꦃ꦳-꧀ꧥꨩ-ꨶꩃꩌꩍꩻ-ꩽꪰꪲ-ꪴꪷꪸꪾ꪿꫁ꫫ-ꫯꫵ꫶ꯣ-ꯪ꯬꯭ﬞ︀-️︠-︯︳︴﹍-﹏＿𐇽𐋠𐍶-𐍺𐨁-𐨃𐨅𐨆𐨌-𐨏𐨸-𐨿𐨺𐫦𐫥𑀀-𑀂𑀸-𑁆𑁿-𑂂𑂰-𑂺𑄀-𑄂𑄧-𑅳𑄴𑆀-𑆂𑆳-𑇊𑇀-𑇌𑈬-𑈷𑈾𑋟-𑋪𑌀-𑌃𑌼𑌾-𑍄𑍇𑍈𑍋-𑍍𑍗𑍢𑍣𑍦-𑍬𑍰-𑍴𑐵-𑑆𑒰-𑓃𑖯-𑖵𑖸-𑗀𑗜𑗝𑘰-𑙀𑚫-𑚷𑜝-𑜫𑰯-𑰶𑰸-𑰿𑲒-𑲧𑲩-𑲶𖫰-𖫴𖬰-𖬶𖽑-𖽾𖾏-𖾒𛲝𛲞𝅥-𝅩𝅭-𝅲𝅻-𝆂𝆅-𝆋𝆪-𝆭𝉂-𝉄𝨀-𝨶𝨻-𝩬𝩵𝪄𝪛-𝪟𝪡-𝪯𞀀-𞀆𞀈-𞀘𞀛-𞀡𞀣𞀤𞀦-𞣐𞀪-𞣖𞥄-𞥊󠄀-󠇯'
diff --git a/python/jinja2/asyncfilters.py b/python/jinja2/asyncfilters.py
deleted file mode 100644
index 5c1f46d..0000000
--- a/python/jinja2/asyncfilters.py
+++ /dev/null
@@ -1,146 +0,0 @@
-from functools import wraps
-
-from jinja2.asyncsupport import auto_aiter
-from jinja2 import filters
-
-
-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_async = lambda args: args[0].is_async
-        wrap_evalctx = False
-    else:
-        if not getattr(normal_filter, 'evalcontextfilter', False) and \
-           not getattr(normal_filter, 'contextfilter', False):
-            wrap_evalctx = True
-        is_async = lambda args: 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=u'', 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 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:
-        func = lambda x: 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 that would be
-    # ridiculous
-    'reject':       do_reject,
-    'rejectattr':   do_rejectattr,
-    'map':          do_map,
-    'select':       do_select,
-    'selectattr':   do_selectattr,
-    'sum':          do_sum,
-    'slice':        do_slice,
-}
diff --git a/python/jinja2/asyncsupport.py b/python/jinja2/asyncsupport.py
deleted file mode 100644
index b1e7b5c..0000000
--- a/python/jinja2/asyncsupport.py
+++ /dev/null
@@ -1,256 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.asyncsupport
-    ~~~~~~~~~~~~~~~~~~~
-
-    Has all the code for async support which is implemented as a patch
-    for supported Python versions.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import sys
-import asyncio
-import inspect
-from functools import update_wrapper
-
-from jinja2.utils import concat, internalcode, Markup
-from jinja2.environment import TemplateModule
-from jinja2.runtime import LoopContextBase, _last_iteration
-
-
-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:
-        exc_info = sys.exc_info()
-    else:
-        return
-    yield self.environment.handle_exception(exc_info, True)
-
-
-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:
-        exc_info = sys.exc_info()
-    return self.environment.handle_exception(exc_info, True)
-
-
-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):
-        if self.environment.is_async:
-            raise RuntimeError('Template module attribute is unavailable '
-                               'in async mode')
-        return original_default_module(self)
-    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 jinja2 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 jinja2.runtime import BlockReference, Macro
-    BlockReference.__call__ = wrap_block_reference_call(
-        BlockReference.__call__)
-    Macro._invoke = wrap_macro_invoke(Macro._invoke)
-
-
-def patch_filters():
-    from jinja2.filters import FILTERS
-    from jinja2.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(LoopContextBase):
-
-    def __init__(self, async_iterator, undefined, after, length, recurse=None,
-                 depth0=0):
-        LoopContextBase.__init__(self, undefined, recurse, depth0)
-        self._async_iterator = async_iterator
-        self._after = after
-        self._length = length
-
-    @property
-    def length(self):
-        if self._length is None:
-            raise TypeError('Loop length for some iterators cannot be '
-                            'lazily calculated in async mode')
-        return self._length
-
-    def __aiter__(self):
-        return AsyncLoopContextIterator(self)
-
-
-class AsyncLoopContextIterator(object):
-    __slots__ = ('context',)
-
-    def __init__(self, context):
-        self.context = context
-
-    def __aiter__(self):
-        return self
-
-    async def __anext__(self):
-        ctx = self.context
-        ctx.index0 += 1
-        if ctx._after is _last_iteration:
-            raise StopAsyncIteration()
-        ctx._before = ctx._current
-        ctx._current = ctx._after
-        try:
-            ctx._after = await ctx._async_iterator.__anext__()
-        except StopAsyncIteration:
-            ctx._after = _last_iteration
-        return ctx._current, ctx
-
-
-async def make_async_loop_context(iterable, undefined, recurse=None, depth0=0):
-    # Length is more complicated and less efficient in async mode.  The
-    # reason for this is that we cannot know if length will be used
-    # upfront but because length is a property we cannot lazily execute it
-    # later.  This means that we need to buffer it up and measure :(
-    #
-    # We however only do this for actual iterators, not for async
-    # iterators as blocking here does not seem like the best idea in the
-    # world.
-    try:
-        length = len(iterable)
-    except (TypeError, AttributeError):
-        if not hasattr(iterable, '__aiter__'):
-            iterable = tuple(iterable)
-            length = len(iterable)
-        else:
-            length = None
-    async_iterator = auto_aiter(iterable)
-    try:
-        after = await async_iterator.__anext__()
-    except StopAsyncIteration:
-        after = _last_iteration
-    return AsyncLoopContext(async_iterator, undefined, after, length, recurse,
-                            depth0)
diff --git a/python/jinja2/bccache.py b/python/jinja2/bccache.py
deleted file mode 100644
index 080e527..0000000
--- a/python/jinja2/bccache.py
+++ /dev/null
@@ -1,362 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.bccache
-    ~~~~~~~~~~~~~~
-
-    This module implements the bytecode cache system Jinja is optionally
-    using.  This is useful if you have very complex template situations and
-    the compiliation of all those templates slow down your application too
-    much.
-
-    Situations where this is useful are often forking web applications that
-    are initialized on the first request.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-from os import path, listdir
-import os
-import sys
-import stat
-import errno
-import marshal
-import tempfile
-import fnmatch
-from hashlib import sha1
-from jinja2.utils import open_if_exists
-from jinja2._compat import BytesIO, pickle, PY2, text_type
-
-
-# marshal works better on 3.x, one hack less required
-if not PY2:
-    marshal_dump = marshal.dump
-    marshal_load = marshal.load
-else:
-
-    def marshal_dump(code, f):
-        if isinstance(f, file):
-            marshal.dump(code, f)
-        else:
-            f.write(marshal.dumps(code))
-
-    def marshal_load(f):
-        if isinstance(f, file):
-            return marshal.load(f)
-        return marshal.loads(f.read())
-
-
-bc_version = 3
-
-# magic version used to only change with new jinja versions.  With 2.6
-# we change this to also take Python version changes into account.  The
-# reason for this is that Python tends to segfault if fed earlier bytecode
-# versions because someone thought it would be a good idea to reuse opcodes
-# or make Python incompatible with earlier versions.
-bc_magic = 'j2'.encode('ascii') + \
-    pickle.dumps(bc_version, 2) + \
-    pickle.dumps((sys.version_info[0] << 24) | sys.version_info[1])
-
-
-class Bucket(object):
-    """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(object):
-    """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
-    Jinja2.
-    """
-
-    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 Jinja2 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, text_type):
-                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 = '_jinja2-cache-%d' % 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 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(listdir(self.directory), self.pattern % '*')
-        for filename in files:
-            try:
-                remove(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:
-
-    -   `werkzeug <http://werkzeug.pocoo.org/>`_.contrib.cache
-    -   `python-memcached <https://www.tummy.com/Community/software/python-memcached/>`_
-    -   `cmemcache <http://gijsbert.org/cmemcache/>`_
-
-    (Unfortunately the django cache interface is not compatible because it
-    does not support storing binary data, only unicode.  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/python/jinja2/compiler.py b/python/jinja2/compiler.py
deleted file mode 100644
index d534a82..0000000
--- a/python/jinja2/compiler.py
+++ /dev/null
@@ -1,1721 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.compiler
-    ~~~~~~~~~~~~~~~
-
-    Compiles nodes into python code.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from itertools import chain
-from copy import deepcopy
-from keyword import iskeyword as is_python_keyword
-from functools import update_wrapper
-from jinja2 import nodes
-from jinja2.nodes import EvalContext
-from jinja2.visitor import NodeVisitor
-from jinja2.optimizer import Optimizer
-from jinja2.exceptions import TemplateAssertionError
-from jinja2.utils import Markup, concat, escape
-from jinja2._compat import range_type, text_type, string_types, \
-     iteritems, NativeStringIO, imap, izip
-from jinja2.idtracking import Symbols, VAR_LOAD_PARAMETER, \
-     VAR_LOAD_RESOLVE, VAR_LOAD_ALIAS, VAR_LOAD_UNDEFINED
-
-
-operators = {
-    'eq':       '==',
-    'ne':       '!=',
-    'gt':       '>',
-    'gteq':     '>=',
-    'lt':       '<',
-    'lteq':     '<=',
-    'in':       'in',
-    'notin':    'not in'
-}
-
-# what method to iterate over items do we want to use for dict iteration
-# in generated code?  on 2.x let's go with iteritems, on 3.x with items
-if hasattr(dict, 'iteritems'):
-    dict_item_iter = 'iteritems'
-else:
-    dict_item_iter = 'items'
-
-code_features = ['division']
-
-# does this python version support generator stops? (PEP 0479)
-try:
-    exec('from __future__ import generator_stop')
-    code_features.append('generator_stop')
-except SyntaxError:
-    pass
-
-# does this python version support yield from?
-try:
-    exec('def f(): yield from x()')
-except SyntaxError:
-    supports_yield_from = False
-else:
-    supports_yield_from = True
-
-
-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_type, Markup) + string_types:
-        return True
-    if type(value) in (tuple, list, set, frozenset):
-        for item in value:
-            if not has_safe_repr(item):
-                return False
-        return True
-    elif type(value) is dict:
-        for key, value in iteritems(value):
-            if not has_safe_repr(key):
-                return False
-            if not has_safe_repr(value):
-                return False
-        return True
-    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(object):
-
-    def __init__(self, node):
-        self.node = node
-        self.accesses_caller = False
-        self.accesses_kwargs = False
-        self.accesses_varargs = False
-
-
-class Frame(object):
-    """Holds compile time information for us."""
-
-    def __init__(self, eval_ctx, parent=None, level=None):
-        self.eval_ctx = eval_ctx
-        self.symbols = Symbols(parent and parent.symbols or 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 and parent.block or 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 = NativeStringIO()
-        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 't_%d' % self._last_identifier
-
-    def buffer(self, frame):
-        """Enable buffering for the frame from that point onwards."""
-        frame.buffer = self.temporary_identifier()
-        self.writeline('%s = []' % 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('return Markup(concat(%s))' % frame.buffer)
-                self.outdent()
-                self.writeline('else:')
-                self.indent()
-                self.writeline('return concat(%s)' % frame.buffer)
-                self.outdent()
-                return
-            elif frame.eval_ctx.autoescape:
-                self.writeline('return Markup(concat(%s))' % frame.buffer)
-                return
-        self.writeline('return concat(%s)' % 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('%s.append(' % frame.buffer, 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 occour.  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 iteritems(extra_kwargs):
-                    self.write(', %s=%s' % (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('%r: ' % kwarg.key)
-                self.visit(kwarg.value, frame)
-                self.write(', ')
-            if extra_kwargs is not None:
-                for key, value in iteritems(extra_kwargs):
-                    self.write('%r: %s, ' % (key, 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('%s = environment.%s[%r]' %
-                               (mapping[name], dependency, name))
-
-    def enter_frame(self, frame):
-        undefs = []
-        for target, (action, param) in iteritems(frame.symbols.loads):
-            if action == VAR_LOAD_PARAMETER:
-                pass
-            elif action == VAR_LOAD_RESOLVE:
-                self.writeline('%s = %s(%r)' %
-                               (target, self.get_resolve_func(), param))
-            elif action == VAR_LOAD_ALIAS:
-                self.writeline('%s = %s' % (target, param))
-            elif action == VAR_LOAD_UNDEFINED:
-                undefs.append(target)
-            else:
-                raise NotImplementedError('unknown load instruction')
-        if undefs:
-            self.writeline('%s = missing' % ' = '.join(undefs))
-
-    def leave_frame(self, frame, with_python_scope=False):
-        if not with_python_scope:
-            undefs = []
-            for target, _ in iteritems(frame.symbols.loads):
-                undefs.append(target)
-            if undefs:
-                self.writeline('%s = missing' % ' = '.join(undefs))
-
-    def func(self, name):
-        if self.environment.is_async:
-            return 'async def %s' % name
-        return 'def %s' % 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 Jinja2 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 not 'kwargs' in skip_special_params:
-            args.append(frame.symbols.declare_parameter('kwargs'))
-            macro_ref.accesses_kwargs = True
-        if 'varargs' in undeclared and not 'varargs' 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('%s(%s):' % (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('if %s is missing:' % ref)
-            self.indent()
-            try:
-                default = node.defaults[idx - len(node.args)]
-            except IndexError:
-                self.writeline('%s = undefined(%r, name=%r)' % (
-                    ref,
-                    'parameter %r was not provided' % arg.name,
-                    arg.name))
-            else:
-                self.writeline('%s = ' % 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('Macro(environment, macro, %r, (%s), %r, %r, %r, '
-                   'context.eval_ctx.autoescape)' %
-                   (name, arg_tuple, macro_ref.accesses_kwargs,
-                    macro_ref.accesses_varargs, macro_ref.accesses_caller))
-
-    def position(self, node):
-        """Return a human readable position for the node."""
-        rv = 'line %d' % node.lineno
-        if self.name is not None:
-            rv += ' in ' + repr(self.name)
-        return rv
-
-    def dump_local_context(self, frame):
-        return '{%s}' % ', '.join(
-            '%r: %s' % (name, target) for name, target
-            in iteritems(frame.symbols.dump_stores()))
-
-    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')
-        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 '%s.resolve' % target
-
-    def derive_context(self, frame):
-        return '%s.derived(%s)' % (
-            self.get_context_ref(),
-            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('context.vars[%r] = %s' % (name, ref))
-        else:
-            self.writeline('context.vars.update({')
-            for idx, name in enumerate(vars):
-                if idx:
-                    self.write(', ')
-                ref = frame.symbols.ref(name)
-                self.write('%r: %s' % (name, ref))
-            self.write('})')
-        if public_names:
-            if len(public_names) == 1:
-                self.writeline('context.exported_vars.add(%r)' %
-                               public_names[0])
-            else:
-                self.writeline('context.exported_vars.update((%s))' %
-                               ', '.join(imap(repr, public_names)))
-
-    # -- 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 jinja2.runtime import __all__ as exported
-        self.writeline('from __future__ import %s' % ', '.join(code_features))
-        self.writeline('from jinja2.runtime import ' + ', '.join(exported))
-
-        if self.environment.is_async:
-            self.writeline('from jinja2.asyncsupport import auto_await, '
-                           'auto_aiter, make_async_loop_context')
-
-        # if we want a deferred initialization we cannot move the
-        # environment into a local name
-        envenv = not self.defer_init and ', environment=environment' or ''
-
-        # 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('block %r defined twice' % block.name, 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('from %s import %s as %s' %
-                                   (module, obj, alias))
-                else:
-                    self.writeline('import %s as %s' % (imp, alias))
-
-        # add the load name
-        self.writeline('name = %r' % self.name)
-
-        # generate the root render function.
-        self.writeline('%s(context, missing=missing%s):' %
-                       (self.func('root'), 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('%s = TemplateReference(context)' % ref)
-        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 supports_yield_from and not self.environment.is_async:
-                self.writeline('yield from parent_template.'
-                               'root_render_func(context)')
-            else:
-                self.writeline('%sfor event in parent_template.'
-                               'root_render_func(context):' %
-                               (self.environment.is_async and 'async ' or ''))
-                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 iteritems(self.blocks):
-            self.writeline('%s(context, missing=missing%s):' %
-                           (self.func('block_' + name), 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('%s = TemplateReference(context)' % ref)
-            if 'super' in undeclared:
-                ref = block_frame.symbols.declare_parameter('super')
-                self.writeline('%s = context.super(%r, '
-                               'block_%s)' % (ref, name, 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()
-
-        self.writeline('blocks = {%s}' % ', '.join('%r: block_%s' % (x, x)
-                                                   for x in self.blocks),
-                       extra=1)
-
-        # add a function that returns the debug info
-        self.writeline('debug_info = %r' % '&'.join('%s=%s' % x for x
-                                                    in self.debug_info))
-
-    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 supports_yield_from and not self.environment.is_async and \
-           frame.buffer is None:
-            self.writeline('yield from context.blocks[%r][0](%s)' % (
-                           node.name, context), node)
-        else:
-            loop = self.environment.is_async and 'async for' or 'for'
-            self.writeline('%s event in context.blocks[%r][0](%s):' % (
-                           loop, node.name, 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(%r)' %
-                           '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(', %r)' % self.name)
-        self.writeline('for name, parent_block in parent_template.'
-                       'blocks.%s():' % dict_item_iter)
-        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, string_types):
-                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('template = environment.%s(' % func_name, node)
-        self.visit(node.template, frame)
-        self.write(', %r)' % self.name)
-        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 = self.environment.is_async and 'async for' or 'for'
-            self.writeline('%s event in template.root_render_func('
-                           'template.new_context(context.get_all(), True, '
-                           '%s)):' % (loop, self.dump_local_context(frame)))
-        elif self.environment.is_async:
-            self.writeline('for event in (await '
-                           'template._get_default_module_async())'
-                           '._body_stream:')
-        else:
-            if supports_yield_from:
-                self.writeline('yield from template._get_default_module()'
-                               '._body_stream')
-                skip_event_yield = True
-            else:
-                self.writeline('for event in template._get_default_module()'
-                               '._body_stream:')
-
-        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('%s = ' % frame.symbols.ref(node.target), node)
-        if frame.toplevel:
-            self.write('context.vars[%r] = ' % node.target)
-        if self.environment.is_async:
-            self.write('await ')
-        self.write('environment.get_template(')
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module%s(context.get_all(), True, %s)'
-                       % (self.environment.is_async and '_async' or '',
-                          self.dump_local_context(frame)))
-        elif self.environment.is_async:
-            self.write('_get_default_module_async()')
-        else:
-            self.write('_get_default_module()')
-        if frame.toplevel and not node.target.startswith('_'):
-            self.writeline('context.exported_vars.discard(%r)' % node.target)
-
-    def visit_FromImport(self, node, frame):
-        """Visit named imports."""
-        self.newline(node)
-        self.write('included_template = %senvironment.get_template('
-                   % (self.environment.is_async and 'await ' or ''))
-        self.visit(node.template, frame)
-        self.write(', %r).' % self.name)
-        if node.with_context:
-            self.write('make_module%s(context.get_all(), True, %s)'
-                       % (self.environment.is_async and '_async' or '',
-                          self.dump_local_context(frame)))
-        elif self.environment.is_async:
-            self.write('_get_default_module_async()')
-        else:
-            self.write('_get_default_module()')
-
-        var_names = []
-        discarded_names = []
-        for name in node.names:
-            if isinstance(name, tuple):
-                name, alias = name
-            else:
-                alias = name
-            self.writeline('%s = getattr(included_template, '
-                           '%r, missing)' % (frame.symbols.ref(alias), name))
-            self.writeline('if %s is missing:' % frame.symbols.ref(alias))
-            self.indent()
-            self.writeline('%s = undefined(%r %% '
-                           'included_template.__name__, '
-                           'name=%r)' %
-                           (frame.symbols.ref(alias),
-                            'the template %%r (imported on %s) does '
-                            'not export the requested name %s' % (
-                                self.position(node),
-                                repr(name)
-                           ), name))
-            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('context.vars[%r] = %s' %
-                               (name, frame.symbols.ref(name)))
-            else:
-                self.writeline('context.vars.update({%s})' % ', '.join(
-                    '%r: %s' % (name, frame.symbols.ref(name)) for name in var_names
-                ))
-        if discarded_names:
-            if len(discarded_names) == 1:
-                self.writeline('context.exported_vars.discard(%r)' %
-                               discarded_names[0])
-            else:
-                self.writeline('context.exported_vars.difference_'
-                               'update((%s))' % ', '.join(imap(repr, discarded_names)))
-
-    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('%s(fiter):' % self.func(loop_filter_func), node.test)
-            self.indent()
-            self.enter_frame(test_frame)
-            self.writeline(self.environment.is_async and 'async for ' or 'for ')
-            self.visit(node.target, loop_frame)
-            self.write(' in ')
-            self.write(self.environment.is_async and 'auto_aiter(fiter)' or '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('%s(reciter, loop_render_func, depth=0):' %
-                           self.func('loop'), 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('%s = missing' % loop_ref)
-
-        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('%s = 1' % iteration_indicator)
-
-        self.writeline(self.environment.is_async and 'async for ' or 'for ', node)
-        self.visit(node.target, loop_frame)
-        if extended_loop:
-            if self.environment.is_async:
-                self.write(', %s in await make_async_loop_context(' % loop_ref)
-            else:
-                self.write(', %s in LoopContext(' % loop_ref)
-        else:
-            self.write(' in ')
-
-        if node.test:
-            self.write('%s(' % 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(extended_loop and ', undefined):' or ':')
-
-        self.indent()
-        self.enter_frame(loop_frame)
-
-        self.blockvisit(node.body, loop_frame)
-        if node.else_:
-            self.writeline('%s = 0' % iteration_indicator)
-        self.outdent()
-        self.leave_frame(loop_frame, with_python_scope=node.recursive
-                         and not node.else_)
-
-        if node.else_:
-            self.writeline('if %s:' % 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('context.exported_vars.add(%r)' % node.name)
-            ref = frame.symbols.ref(node.name)
-            self.writeline('context.vars[%r] = ' % node.name)
-        self.write('%s = ' % 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 idx, (target, expr) in enumerate(izip(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)
-
-    def visit_Output(self, node, frame):
-        # if we have a known extends statement, we don't output anything
-        # if we are in a require_output_check section
-        if self.has_known_extends and frame.require_output_check:
-            return
-
-        allow_constant_finalize = True
-        if self.environment.finalize:
-            func = self.environment.finalize
-            if getattr(func, 'contextfunction', False) or \
-               getattr(func, 'evalcontextfunction', False):
-                allow_constant_finalize = False
-            elif getattr(func, 'environmentfunction', False):
-                finalize = lambda x: text_type(
-                    self.environment.finalize(self.environment, x))
-            else:
-                finalize = lambda x: text_type(self.environment.finalize(x))
-        else:
-            finalize = text_type
-
-        # if we are inside a frame that requires output checking, we do so
-        outdent_later = False
-        if frame.require_output_check:
-            self.writeline('if parent_template is None:')
-            self.indent()
-            outdent_later = True
-
-        # try to evaluate as many chunks as possible into a static
-        # string at compile time.
-        body = []
-        for child in node.nodes:
-            try:
-                if not allow_constant_finalize:
-                    raise nodes.Impossible()
-                const = child.as_const(frame.eval_ctx)
-            except nodes.Impossible:
-                body.append(child)
-                continue
-            # the frame can't be volatile here, becaus otherwise the
-            # as_const() function would raise an Impossible exception
-            # at that point.
-            try:
-                if frame.eval_ctx.autoescape:
-                    if hasattr(const, '__html__'):
-                        const = const.__html__()
-                    else:
-                        const = escape(const)
-                const = finalize(const)
-            except Exception:
-                # if something goes wrong here we evaluate the node
-                # at runtime for easier debugging
-                body.append(child)
-                continue
-            if body and isinstance(body[-1], list):
-                body[-1].append(const)
-            else:
-                body.append([const])
-
-        # if we have less than 3 nodes or a buffer we yield or extend/append
-        if len(body) < 3 or frame.buffer is not None:
-            if frame.buffer is not None:
-                # for one item we append, for more we extend
-                if len(body) == 1:
-                    self.writeline('%s.append(' % frame.buffer)
-                else:
-                    self.writeline('%s.extend((' % frame.buffer)
-                self.indent()
-            for item in body:
-                if isinstance(item, list):
-                    val = repr(concat(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)
-                    close = 1
-                    if frame.eval_ctx.volatile:
-                        self.write('(escape if context.eval_ctx.autoescape'
-                                   ' else to_string)(')
-                    elif frame.eval_ctx.autoescape:
-                        self.write('escape(')
-                    else:
-                        self.write('to_string(')
-                    if self.environment.finalize is not None:
-                        self.write('environment.finalize(')
-                        if getattr(self.environment.finalize,
-                                   "contextfunction", False):
-                            self.write('context, ')
-                        close += 1
-                    self.visit(item, frame)
-                    self.write(')' * close)
-                    if frame.buffer is not None:
-                        self.write(',')
-            if frame.buffer is not None:
-                # close the open parentheses
-                self.outdent()
-                self.writeline(len(body) == 1 and ')' or '))')
-
-        # otherwise we create a format string as this is faster in that case
-        else:
-            format = []
-            arguments = []
-            for item in body:
-                if isinstance(item, list):
-                    format.append(concat(item).replace('%', '%%'))
-                else:
-                    format.append('%s')
-                    arguments.append(item)
-            self.writeline('yield ')
-            self.write(repr(concat(format)) + ' % (')
-            self.indent()
-            for argument in arguments:
-                self.newline(argument)
-                close = 0
-                if frame.eval_ctx.volatile:
-                    self.write('(escape if context.eval_ctx.autoescape else'
-                               ' to_string)(')
-                    close += 1
-                elif frame.eval_ctx.autoescape:
-                    self.write('escape(')
-                    close += 1
-                if self.environment.finalize is not None:
-                    self.write('environment.finalize(')
-                    if getattr(self.environment.finalize,
-                               'contextfunction', False):
-                        self.write('context, ')
-                    elif getattr(self.environment.finalize,
-                               'evalcontextfunction', False):
-                        self.write('context.eval_ctx, ')
-                    elif getattr(self.environment.finalize,
-                               'environmentfunction', False):
-                        self.write('environment, ')
-                    close += 1
-                self.visit(argument, frame)
-                self.write(')' * close + ', ')
-            self.outdent()
-            self.writeline(')')
-
-        if outdent_later:
-            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('concat(%s)' % 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('(undefined(name=%r) if %s is missing else %s)' %
-                           (node.name, ref, 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('if not isinstance(%s, Namespace):' % ref)
-        self.indent()
-        self.writeline('raise TemplateRuntimeError(%r)' %
-                       'cannot assign attribute on non-namespace object')
-        self.outdent()
-        self.writeline('%s[%r]' % (ref, node.attr))
-
-    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('(Markup if context.eval_ctx.autoescape else identity)(%r)'
-                       % node.data)
-
-    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(idx == 0 and ',)' or ')')
-
-    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):
-        @optimizeconst
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_binops:
-                self.write('environment.call_binop(context, %r, ' % operator)
-                self.visit(node.left, frame)
-                self.write(', ')
-                self.visit(node.right, frame)
-            else:
-                self.write('(')
-                self.visit(node.left, frame)
-                self.write(' %s ' % operator)
-                self.visit(node.right, frame)
-            self.write(')')
-        return visitor
-
-    def uaop(operator, interceptable=True):
-        @optimizeconst
-        def visitor(self, node, frame):
-            if self.environment.sandboxed and \
-               operator in self.environment.intercepted_unops:
-                self.write('environment.call_unop(context, %r, ' % operator)
-                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 = '(context.eval_ctx.volatile and' \
-                        ' markup_join or unicode_join)'
-        elif frame.eval_ctx.autoescape:
-            func_name = 'markup_join'
-        else:
-            func_name = 'unicode_join'
-        self.write('%s((' % func_name)
-        for arg in node.nodes:
-            self.visit(arg, frame)
-            self.write(', ')
-        self.write('))')
-
-    @optimizeconst
-    def visit_Compare(self, node, frame):
-        self.visit(node.expr, frame)
-        for op in node.ops:
-            self.visit(op, frame)
-
-    def visit_Operand(self, node, frame):
-        self.write(' %s ' % operators[node.op])
-        self.visit(node.expr, frame)
-
-    @optimizeconst
-    def visit_Getattr(self, node, frame):
-        self.write('environment.getattr(')
-        self.visit(node.node, frame)
-        self.write(', %r)' % node.attr)
-
-    @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:
-            self.write('environment.getitem(')
-            self.visit(node.node, frame)
-            self.write(', ')
-            self.visit(node.arg, frame)
-            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('no filter named %r' % node.name, node.lineno)
-        if getattr(func, 'contextfilter', False):
-            self.write('context, ')
-        elif getattr(func, 'evalcontextfilter', False):
-            self.write('context.eval_ctx, ')
-        elif getattr(func, 'environmentfilter', False):
-            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('(context.eval_ctx.autoescape and'
-                       ' Markup(concat(%s)) or concat(%s))' %
-                       (frame.buffer, frame.buffer))
-        elif frame.eval_ctx.autoescape:
-            self.write('Markup(concat(%s))' % frame.buffer)
-        else:
-            self.write('concat(%s)' % 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('no test named %r' % node.name, 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('undefined(%r)' % ('the inline if-'
-                       'expression on %s evaluated to false and '
-                       'no else section was defined.' % self.position(node)))
-
-        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 = forward_caller and {'caller': 'caller'} or 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('(context.eval_ctx.autoescape and Markup or 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('environment.extensions[%r].%s' % (node.identifier, 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_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('%s = %s' % (ctx, self.derive_context(frame)))
-        self.writeline('%s.vars = ' % ctx)
-        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('context.eval_ctx.%s = ' % 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('%s = context.eval_ctx.save()' % old_ctx_name)
-        self.visit_EvalContextModifier(node, frame)
-        for child in node.body:
-            self.visit(child, frame)
-        frame.eval_ctx.revert(saved_ctx)
-        self.writeline('context.eval_ctx.revert(%s)' % old_ctx_name)
diff --git a/python/jinja2/constants.py b/python/jinja2/constants.py
deleted file mode 100644
index 11efd1e..0000000
--- a/python/jinja2/constants.py
+++ /dev/null
@@ -1,32 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja.constants
-    ~~~~~~~~~~~~~~~
-
-    Various constants.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-
-
-#: list of lorem ipsum words used by the lipsum() helper function
-LOREM_IPSUM_WORDS = u'''\
-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/python/jinja2/debug.py b/python/jinja2/debug.py
deleted file mode 100644
index b61139f..0000000
--- a/python/jinja2/debug.py
+++ /dev/null
@@ -1,372 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.debug
-    ~~~~~~~~~~~~
-
-    Implements the debug interface for Jinja.  This module does some pretty
-    ugly stuff with the Python traceback system in order to achieve tracebacks
-    with correct line numbers, locals and contents.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import sys
-import traceback
-from types import TracebackType, CodeType
-from jinja2.utils import missing, internal_code
-from jinja2.exceptions import TemplateSyntaxError
-from jinja2._compat import iteritems, reraise, PY2
-
-# on pypy we can take advantage of transparent proxies
-try:
-    from __pypy__ import tproxy
-except ImportError:
-    tproxy = None
-
-
-# how does the raise helper look like?
-try:
-    exec("raise TypeError, 'foo'")
-except SyntaxError:
-    raise_helper = 'raise __jinja_exception__[1]'
-except TypeError:
-    raise_helper = 'raise __jinja_exception__[0], __jinja_exception__[1]'
-
-
-class TracebackFrameProxy(object):
-    """Proxies a traceback frame."""
-
-    def __init__(self, tb):
-        self.tb = tb
-        self._tb_next = None
-
-    @property
-    def tb_next(self):
-        return self._tb_next
-
-    def set_next(self, next):
-        if tb_set_next is not None:
-            try:
-                tb_set_next(self.tb, next and next.tb or None)
-            except Exception:
-                # this function can fail due to all the hackery it does
-                # on various python implementations.  We just catch errors
-                # down and ignore them if necessary.
-                pass
-        self._tb_next = next
-
-    @property
-    def is_jinja_frame(self):
-        return '__jinja_template__' in self.tb.tb_frame.f_globals
-
-    def __getattr__(self, name):
-        return getattr(self.tb, name)
-
-
-def make_frame_proxy(frame):
-    proxy = TracebackFrameProxy(frame)
-    if tproxy is None:
-        return proxy
-    def operation_handler(operation, *args, **kwargs):
-        if operation in ('__getattribute__', '__getattr__'):
-            return getattr(proxy, args[0])
-        elif operation == '__setattr__':
-            proxy.__setattr__(*args, **kwargs)
-        else:
-            return getattr(proxy, operation)(*args, **kwargs)
-    return tproxy(TracebackType, operation_handler)
-
-
-class ProcessedTraceback(object):
-    """Holds a Jinja preprocessed traceback for printing or reraising."""
-
-    def __init__(self, exc_type, exc_value, frames):
-        assert frames, 'no frames for this traceback?'
-        self.exc_type = exc_type
-        self.exc_value = exc_value
-        self.frames = frames
-
-        # newly concatenate the frames (which are proxies)
-        prev_tb = None
-        for tb in self.frames:
-            if prev_tb is not None:
-                prev_tb.set_next(tb)
-            prev_tb = tb
-        prev_tb.set_next(None)
-
-    def render_as_text(self, limit=None):
-        """Return a string with the traceback."""
-        lines = traceback.format_exception(self.exc_type, self.exc_value,
-                                           self.frames[0], limit=limit)
-        return ''.join(lines).rstrip()
-
-    def render_as_html(self, full=False):
-        """Return a unicode string with the traceback as rendered HTML."""
-        from jinja2.debugrenderer import render_traceback
-        return u'%s\n\n<!--\n%s\n-->' % (
-            render_traceback(self, full=full),
-            self.render_as_text().decode('utf-8', 'replace')
-        )
-
-    @property
-    def is_template_syntax_error(self):
-        """`True` if this is a template syntax error."""
-        return isinstance(self.exc_value, TemplateSyntaxError)
-
-    @property
-    def exc_info(self):
-        """Exception info tuple with a proxy around the frame objects."""
-        return self.exc_type, self.exc_value, self.frames[0]
-
-    @property
-    def standard_exc_info(self):
-        """Standard python exc_info for re-raising"""
-        tb = self.frames[0]
-        # the frame will be an actual traceback (or transparent proxy) if
-        # we are on pypy or a python implementation with support for tproxy
-        if type(tb) is not TracebackType:
-            tb = tb.tb
-        return self.exc_type, self.exc_value, tb
-
-
-def make_traceback(exc_info, source_hint=None):
-    """Creates a processed traceback object from the exc_info."""
-    exc_type, exc_value, tb = exc_info
-    if isinstance(exc_value, TemplateSyntaxError):
-        exc_info = translate_syntax_error(exc_value, source_hint)
-        initial_skip = 0
-    else:
-        initial_skip = 1
-    return translate_exception(exc_info, initial_skip)
-
-
-def translate_syntax_error(error, source=None):
-    """Rewrites a syntax error to please traceback systems."""
-    error.source = source
-    error.translated = True
-    exc_info = (error.__class__, error, None)
-    filename = error.filename
-    if filename is None:
-        filename = '<unknown>'
-    return fake_exc_info(exc_info, filename, error.lineno)
-
-
-def translate_exception(exc_info, initial_skip=0):
-    """If passed an exc_info it will automatically rewrite the exceptions
-    all the way down to the correct line numbers and frames.
-    """
-    tb = exc_info[2]
-    frames = []
-
-    # skip some internal frames if wanted
-    for x in range(initial_skip):
-        if tb is not None:
-            tb = tb.tb_next
-    initial_tb = tb
-
-    while tb is not None:
-        # skip frames decorated with @internalcode.  These are internal
-        # calls we can't avoid and that are useless in template debugging
-        # output.
-        if tb.tb_frame.f_code in internal_code:
-            tb = tb.tb_next
-            continue
-
-        # save a reference to the next frame if we override the current
-        # one with a faked one.
-        next = tb.tb_next
-
-        # fake template exceptions
-        template = tb.tb_frame.f_globals.get('__jinja_template__')
-        if template is not None:
-            lineno = template.get_corresponding_lineno(tb.tb_lineno)
-            tb = fake_exc_info(exc_info[:2] + (tb,), template.filename,
-                               lineno)[2]
-
-        frames.append(make_frame_proxy(tb))
-        tb = next
-
-    # if we don't have any exceptions in the frames left, we have to
-    # reraise it unchanged.
-    # XXX: can we backup here?  when could this happen?
-    if not frames:
-        reraise(exc_info[0], exc_info[1], exc_info[2])
-
-    return ProcessedTraceback(exc_info[0], exc_info[1], frames)
-
-
-def get_jinja_locals(real_locals):
-    ctx = real_locals.get('context')
-    if ctx:
-        locals = ctx.get_all().copy()
-    else:
-        locals = {}
-
-    local_overrides = {}
-
-    for name, value in iteritems(real_locals):
-        if not name.startswith('l_') or value is missing:
-            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)
-
-    for name, (_, value) in iteritems(local_overrides):
-        if value is missing:
-            locals.pop(name, None)
-        else:
-            locals[name] = value
-
-    return locals
-
-
-def fake_exc_info(exc_info, filename, lineno):
-    """Helper for `translate_exception`."""
-    exc_type, exc_value, tb = exc_info
-
-    # figure the real context out
-    if tb is not None:
-        locals = get_jinja_locals(tb.tb_frame.f_locals)
-
-        # if there is a local called __jinja_exception__, we get
-        # rid of it to not break the debug functionality.
-        locals.pop('__jinja_exception__', None)
-    else:
-        locals = {}
-
-    # assamble fake globals we need
-    globals = {
-        '__name__':             filename,
-        '__file__':             filename,
-        '__jinja_exception__':  exc_info[:2],
-
-        # we don't want to keep the reference to the template around
-        # to not cause circular dependencies, but we mark it as Jinja
-        # frame for the ProcessedTraceback
-        '__jinja_template__':   None
-    }
-
-    # and fake the exception
-    code = compile('\n' * (lineno - 1) + raise_helper, filename, 'exec')
-
-    # if it's possible, change the name of the code.  This won't work
-    # on some python environments such as google appengine
-    try:
-        if tb is None:
-            location = 'template'
-        else:
-            function = tb.tb_frame.f_code.co_name
-            if function == 'root':
-                location = 'top-level template code'
-            elif function.startswith('block_'):
-                location = 'block "%s"' % function[6:]
-            else:
-                location = 'template'
-
-        if PY2:
-            code = CodeType(0, code.co_nlocals, code.co_stacksize,
-                            code.co_flags, code.co_code, code.co_consts,
-                            code.co_names, code.co_varnames, filename,
-                            location, code.co_firstlineno,
-                            code.co_lnotab, (), ())
-        else:
-            code = CodeType(0, code.co_kwonlyargcount,
-                            code.co_nlocals, code.co_stacksize,
-                            code.co_flags, code.co_code, code.co_consts,
-                            code.co_names, code.co_varnames, filename,
-                            location, code.co_firstlineno,
-                            code.co_lnotab, (), ())
-    except Exception as e:
-        pass
-
-    # execute the code and catch the new traceback
-    try:
-        exec(code, globals, locals)
-    except:
-        exc_info = sys.exc_info()
-        new_tb = exc_info[2].tb_next
-
-    # return without this frame
-    return exc_info[:2] + (new_tb,)
-
-
-def _init_ugly_crap():
-    """This function implements a few ugly things so that we can patch the
-    traceback objects.  The function returned allows resetting `tb_next` on
-    any python traceback object.  Do not attempt to use this on non cpython
-    interpreters
-    """
-    import ctypes
-    from types import TracebackType
-
-    if PY2:
-        # figure out size of _Py_ssize_t for Python 2:
-        if hasattr(ctypes.pythonapi, 'Py_InitModule4_64'):
-            _Py_ssize_t = ctypes.c_int64
-        else:
-            _Py_ssize_t = ctypes.c_int
-    else:
-        # platform ssize_t on Python 3
-        _Py_ssize_t = ctypes.c_ssize_t
-
-    # regular python
-    class _PyObject(ctypes.Structure):
-        pass
-    _PyObject._fields_ = [
-        ('ob_refcnt', _Py_ssize_t),
-        ('ob_type', ctypes.POINTER(_PyObject))
-    ]
-
-    # python with trace
-    if hasattr(sys, 'getobjects'):
-        class _PyObject(ctypes.Structure):
-            pass
-        _PyObject._fields_ = [
-            ('_ob_next', ctypes.POINTER(_PyObject)),
-            ('_ob_prev', ctypes.POINTER(_PyObject)),
-            ('ob_refcnt', _Py_ssize_t),
-            ('ob_type', ctypes.POINTER(_PyObject))
-        ]
-
-    class _Traceback(_PyObject):
-        pass
-    _Traceback._fields_ = [
-        ('tb_next', ctypes.POINTER(_Traceback)),
-        ('tb_frame', ctypes.POINTER(_PyObject)),
-        ('tb_lasti', ctypes.c_int),
-        ('tb_lineno', ctypes.c_int)
-    ]
-
-    def tb_set_next(tb, next):
-        """Set the tb_next attribute of a traceback object."""
-        if not (isinstance(tb, TracebackType) and
-                (next is None or isinstance(next, TracebackType))):
-            raise TypeError('tb_set_next arguments must be traceback objects')
-        obj = _Traceback.from_address(id(tb))
-        if tb.tb_next is not None:
-            old = _Traceback.from_address(id(tb.tb_next))
-            old.ob_refcnt -= 1
-        if next is None:
-            obj.tb_next = ctypes.POINTER(_Traceback)()
-        else:
-            next = _Traceback.from_address(id(next))
-            next.ob_refcnt += 1
-            obj.tb_next = ctypes.pointer(next)
-
-    return tb_set_next
-
-
-# try to get a tb_set_next implementation if we don't have transparent
-# proxies.
-tb_set_next = None
-if tproxy is None:
-    try:
-        tb_set_next = _init_ugly_crap()
-    except:
-        pass
-    del _init_ugly_crap
diff --git a/python/jinja2/defaults.py b/python/jinja2/defaults.py
deleted file mode 100644
index 7c93dec..0000000
--- a/python/jinja2/defaults.py
+++ /dev/null
@@ -1,56 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.defaults
-    ~~~~~~~~~~~~~~~
-
-    Jinja default filters and tags.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2._compat import range_type
-from jinja2.utils import generate_lorem_ipsum, Cycler, Joiner, 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
-from jinja2.filters import FILTERS as DEFAULT_FILTERS
-from jinja2.tests import TESTS as DEFAULT_TESTS
-DEFAULT_NAMESPACE = {
-    'range':        range_type,
-    '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,
-}
-
-
-# export all constants
-__all__ = tuple(x for x in locals().keys() if x.isupper())
diff --git a/python/jinja2/environment.py b/python/jinja2/environment.py
deleted file mode 100644
index 549d9af..0000000
--- a/python/jinja2/environment.py
+++ /dev/null
@@ -1,1276 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.environment
-    ~~~~~~~~~~~~~~~~~~
-
-    Provides a class that holds runtime and parsing time options.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import os
-import sys
-import weakref
-from functools import reduce, partial
-from jinja2 import nodes
-from jinja2.defaults import 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, NEWLINE_SEQUENCE, \
-     DEFAULT_FILTERS, DEFAULT_TESTS, DEFAULT_NAMESPACE, \
-     DEFAULT_POLICIES, KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
-from jinja2.lexer import get_lexer, TokenStream
-from jinja2.parser import Parser
-from jinja2.nodes import EvalContext
-from jinja2.compiler import generate, CodeGenerator
-from jinja2.runtime import Undefined, new_context, Context
-from jinja2.exceptions import TemplateSyntaxError, TemplateNotFound, \
-     TemplatesNotFound, TemplateRuntimeError
-from jinja2.utils import import_string, LRUCache, Markup, missing, \
-     concat, consume, internalcode, have_async_gen
-from jinja2._compat import imap, ifilter, string_types, iteritems, \
-     text_type, reraise, implements_iterator, implements_to_string, \
-     encode_filename, PY2, PYPY
-
-
-# for direct template usage we have up to ten living environments
-_spontaneous_environments = LRUCache(10)
-
-# the function to create jinja traceback objects.  This is dynamically
-# imported on the first exception in the exception handler.
-_make_traceback = None
-
-
-def get_spontaneous_environment(*args):
-    """Return a new spontaneous environment.  A spontaneous environment is an
-    unnamed and unaccessible (in theory) environment that is used for
-    templates generated from a string and not from the file system.
-    """
-    try:
-        env = _spontaneous_environments.get(args)
-    except TypeError:
-        return Environment(*args)
-    if env is not None:
-        return env
-    _spontaneous_environments[args] = env = Environment(*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, string_types):
-            extension = import_string(extension)
-        result[extension.identifier] = extension(environment)
-    return result
-
-
-def fail_for_missing_callable(string, name):
-    msg = string % name
-    if isinstance(name, Undefined):
-        try:
-            name._fail_with_undefined_error()
-        except Exception as e:
-            msg = '%s (%s; did you forget to quote the callable name?)' % (msg, e)
-    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(object):
-    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:`~jinja2.utils.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
-            you to take advantage of newer Python features.  This requires
-            Python 3.6 or later.
-    """
-
-    #: 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
-
-    #: these are currently EXPERIMENTAL undocumented features.
-    exception_handler = None
-    exception_formatter = None
-
-    #: 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
-
-        _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 iteritems(attributes):
-            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 iteritems(args):
-            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 iteritems(self.extensions):
-            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, string_types):
-                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 it.
-
-        Note that on Python 3 this might return a coroutine in case 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('no filter named %r', name)
-        args = [value] + list(args or ())
-        if getattr(func, 'contextfilter', False):
-            if context is None:
-                raise TemplateRuntimeError('Attempted to invoke context '
-                                           'filter without context')
-            args.insert(0, context)
-        elif getattr(func, 'evalcontextfilter', False):
-            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):
-            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('no test named %r', 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 Jinja2 extensions <writing-extensions>`
-        this gives you a good overview of the node tree generated.
-        """
-        try:
-            return self._parse(source, name, filename)
-        except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=source)
-
-    def _parse(self, source, name, filename):
-        """Internal parsing function used by `parse` and `compile`."""
-        return Parser(self, source, name, encode_filename(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 = text_type(source)
-        try:
-            return self.lexer.tokeniter(source, name, filename)
-        except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=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(), text_type(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, string_types):
-                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>'
-            else:
-                filename = encode_filename(filename)
-            return self._compile(source, filename)
-        except TemplateSyntaxError:
-            exc_info = sys.exc_info()
-        self.handle_exception(exc_info, source_hint=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')
-        exc_info = None
-        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:
-            exc_info = sys.exc_info()
-        if exc_info is not None:
-            self.handle_exception(exc_info, source_hint=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, py_compile=False):
-        """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.
-
-        If `py_compile` is set to `True` .pyc files will be written to the
-        target instead of standard .py files.  This flag does not do anything
-        on pypy and Python 3 where pyc files are not picked up by itself and
-        don't give much benefit.
-
-        .. versionadded:: 2.4
-        """
-        from jinja2.loaders import ModuleLoader
-
-        if log_function is None:
-            log_function = lambda x: None
-
-        if py_compile:
-            if not PY2 or PYPY:
-                from warnings import warn
-                warn(Warning('py_compile has no effect on pypy or Python 3'))
-                py_compile = False
-            else:
-                import imp
-                import marshal
-                py_header = imp.get_magic() + \
-                    u'\xff\xff\xff\xff'.encode('iso-8859-15')
-
-                # Python 3.3 added a source filesize to the header
-                if sys.version_info >= (3, 3):
-                    py_header += u'\x00\x00\x00\x00'.encode('iso-8859-15')
-
-        def write_file(filename, data, mode):
-            if zip:
-                info = ZipInfo(filename)
-                info.external_attr = 0o755 << 16
-                zip_file.writestr(info, data)
-            else:
-                f = open(os.path.join(target, filename), mode)
-                try:
-                    f.write(data)
-                finally:
-                    f.close()
-
-        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('Compiling into Zip archive "%s"' % target)
-        else:
-            if not os.path.isdir(target):
-                os.makedirs(target)
-            log_function('Compiling into folder "%s"' % target)
-
-        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('Could not compile "%s": %s' % (name, e))
-                    continue
-
-                filename = ModuleLoader.get_module_filename(name)
-
-                if py_compile:
-                    c = self._compile(code, encode_filename(filename))
-                    write_file(filename + 'c', py_header +
-                               marshal.dumps(c), 'wb')
-                    log_function('Byte-compiled "%s" as %s' %
-                                 (name, filename + 'c'))
-                else:
-                    write_file(filename, code, 'w')
-                    log_function('Compiled "%s" as %s' % (name, 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
-        """
-        x = 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')
-            filter_func = lambda x: '.' in x and \
-                                    x.rsplit('.', 1)[1] in extensions
-        if filter_func is not None:
-            x = list(ifilter(filter_func, x))
-        return x
-
-    def handle_exception(self, exc_info=None, rendered=False, source_hint=None):
-        """Exception handling helper.  This is used internally to either raise
-        rewritten exceptions or return a rendered traceback for the template.
-        """
-        global _make_traceback
-        if exc_info is None:
-            exc_info = sys.exc_info()
-
-        # the debugging module is imported when it's used for the first time.
-        # we're doing a lot of stuff there and for applications that do not
-        # get any exceptions in template rendering there is no need to load
-        # all of that.
-        if _make_traceback is None:
-            from jinja2.debug import make_traceback as _make_traceback
-        traceback = _make_traceback(exc_info, source_hint)
-        if rendered and self.exception_formatter is not None:
-            return self.exception_formatter(traceback)
-        if self.exception_handler is not None:
-            self.exception_handler(traceback)
-        exc_type, exc_value, tb = traceback.standard_exc_info
-        reraise(exc_type, exc_value, tb)
-
-    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.
-
-        .. versionadded:: 2.3
-
-        .. versionchanged:: 2.4
-           If `names` contains a :class:`Template` object it is returned
-           from the function unchanged.
-        """
-        if not names:
-            raise TemplatesNotFound(message=u'Tried to select from an empty list '
-                                            u'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:
-                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, string_types):
-            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(object):
-    """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
-    """
-
-    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(
-            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 unicode string.
-        """
-        vars = dict(*args, **kwargs)
-        try:
-            return concat(self.root_render_func(self.new_context(vars)))
-        except Exception:
-            exc_info = sys.exc_info()
-        return self.environment.handle_exception(exc_info, True)
-
-    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 unicode strings.
-
-        It accepts the same arguments as :meth:`render`.
-        """
-        vars = dict(*args, **kwargs)
-        try:
-            for event in self.root_render_func(self.new_context(vars)):
-                yield event
-        except Exception:
-            exc_info = sys.exc_info()
-        else:
-            return
-        yield self.environment.handle_exception(exc_info, True)
-
-    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 it 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 exections 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):
-        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."""
-        return [tuple(imap(int, x.split('='))) for x in
-                self._debug_info.split('&')]
-
-    def __repr__(self):
-        if self.name is None:
-            name = 'memory:%x' % id(self)
-        else:
-            name = repr(self.name)
-        return '<%s %s>' % (self.__class__.__name__, name)
-
-
-@implements_to_string
-class TemplateModule(object):
-    """Represents an imported template.  All the exported names of the
-    template are available as attributes on this object.  Additionally
-    converting it into an unicode- or bytestrings 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 = 'memory:%x' % id(self)
-        else:
-            name = repr(self.__name__)
-        return '<%s %s>' % (self.__class__.__name__, name)
-
-
-class TemplateExpression(object):
-    """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
-
-
-@implements_iterator
-class TemplateStream(object):
-    """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 unicode string is yielded.
-
-    If buffering is enabled with a buffer size of 5, five items are combined
-    into a new unicode 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 unicode 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, string_types):
-            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/python/jinja2/exceptions.py b/python/jinja2/exceptions.py
deleted file mode 100644
index c018a33..0000000
--- a/python/jinja2/exceptions.py
+++ /dev/null
@@ -1,146 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.exceptions
-    ~~~~~~~~~~~~~~~~~
-
-    Jinja exceptions.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2._compat import imap, text_type, PY2, implements_to_string
-
-
-class TemplateError(Exception):
-    """Baseclass for all template errors."""
-
-    if PY2:
-        def __init__(self, message=None):
-            if message is not None:
-                message = text_type(message).encode('utf-8')
-            Exception.__init__(self, message)
-
-        @property
-        def message(self):
-            if self.args:
-                message = self.args[0]
-                if message is not None:
-                    return message.decode('utf-8', 'replace')
-
-        def __unicode__(self):
-            return self.message or u''
-    else:
-        def __init__(self, message=None):
-            Exception.__init__(self, message)
-
-        @property
-        def message(self):
-            if self.args:
-                message = self.args[0]
-                if message is not None:
-                    return message
-
-
-@implements_to_string
-class TemplateNotFound(IOError, LookupError, TemplateError):
-    """Raised if a template does not exist."""
-
-    # looks weird, but removes the warning descriptor that just
-    # bogusly warns us about message being deprecated
-    message = None
-
-    def __init__(self, name, message=None):
-        IOError.__init__(self)
-        if message is None:
-            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.
-
-    .. versionadded:: 2.2
-    """
-
-    def __init__(self, names=(), message=None):
-        if message is None:
-            message = u'none of the templates given were found: ' + \
-                      u', '.join(imap(text_type, names))
-        TemplateNotFound.__init__(self, names and names[-1] or None, message)
-        self.templates = list(names)
-
-
-@implements_to_string
-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 = 'line %d' % self.lineno
-        name = self.filename or self.name
-        if name:
-            location = 'File "%s", %s' % (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 u'\n'.join(lines)
-
-
-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/python/jinja2/ext.py b/python/jinja2/ext.py
deleted file mode 100644
index 0734a84..0000000
--- a/python/jinja2/ext.py
+++ /dev/null
@@ -1,627 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.ext
-    ~~~~~~~~~~
-
-    Jinja extensions allow to add custom tags similar to the way django custom
-    tags work.  By default two example extensions exist: an i18n and a cache
-    extension.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-import re
-
-from jinja2 import nodes
-from jinja2.defaults import 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, NEWLINE_SEQUENCE, \
-     KEEP_TRAILING_NEWLINE, LSTRIP_BLOCKS
-from jinja2.environment import Environment
-from jinja2.runtime import concat
-from jinja2.exceptions import TemplateAssertionError, TemplateSyntaxError
-from jinja2.utils import contextfunction, import_string, Markup
-from jinja2._compat import with_metaclass, string_types, iteritems
-
-
-# the only real useful gettext functions for a Jinja template.  Note
-# that ugettext must be assigned to gettext as Jinja doesn't support
-# non unicode strings.
-GETTEXT_FUNCTIONS = ('_', 'gettext', 'ngettext')
-
-
-class ExtensionRegistry(type):
-    """Gives the extension an unique identifier."""
-
-    def __new__(cls, name, bases, d):
-        rv = type.__new__(cls, name, bases, d)
-        rv.identifier = rv.__module__ + '.' + rv.__name__
-        return rv
-
-
-class Extension(with_metaclass(ExtensionRegistry, object)):
-    """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`.
-
-        In the `ext` folder of the Jinja2 source distribution there is a file
-        called `inlinegettext.py` which implements a filter that utilizes this
-        method.
-        """
-        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)
-        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)
-        return rv % variables
-    return ngettext
-
-
-class InternationalizationExtension(Extension):
-    """This extension adds gettext support to Jinja2."""
-    tags = set(['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):
-        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: (n != 1 and (p,) or (s,))[0],
-            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, string_types):
-            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('translatable variable %r defined twice.' %
-                            name.value, 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('unknown variable %r for pluralization' %
-                                name.value, 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=re.compile(r'\s*\n\s*')):
-        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('%%(%s)s' % name)
-                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:
-                assert False, '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 iteritems(variables):
-                # 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 Jinja2 that works like the print statement just
-    that it doesn't print the return value.
-    """
-    tags = set(['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 = set(['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
-
-
-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 itself (a ``unicode`` object, or a tuple
-       of ``unicode`` objects 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, string_types):
-                strings.append(arg.value)
-            else:
-                strings.append(None)
-
-        for arg 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(object):
-    """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 preceeding 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 as e:
-        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
diff --git a/python/jinja2/filters.py b/python/jinja2/filters.py
deleted file mode 100644
index 267dddd..0000000
--- a/python/jinja2/filters.py
+++ /dev/null
@@ -1,1190 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.filters
-    ~~~~~~~~~~~~~~
-
-    Bundled jinja filters.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import re
-import math
-import random
-import warnings
-
-from itertools import groupby, chain
-from collections import namedtuple
-from jinja2.utils import Markup, escape, pformat, urlize, soft_unicode, \
-     unicode_urlencode, htmlsafe_json_dumps
-from jinja2.runtime import Undefined
-from jinja2.exceptions import FilterArgumentError
-from jinja2._compat import imap, string_types, text_type, iteritems, PY2
-
-
-_word_re = re.compile(r'\w+', re.UNICODE)
-_word_beginning_split_re = re.compile(r'([-\s\(\{\[\<]+)', re.UNICODE)
-
-
-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, string_types) else value
-
-
-def make_attrgetter(environment, attribute, postprocess=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.
-    """
-    if attribute is None:
-        attribute = []
-    elif isinstance(attribute, string_types):
-        attribute = [int(x) if x.isdigit() else x for x in attribute.split('.')]
-    else:
-        attribute = [attribute]
-
-    def attrgetter(item):
-        for part in attribute:
-            item = environment.getitem(item, part)
-
-        if postprocess is not None:
-            item = postprocess(item)
-
-        return item
-
-    return attrgetter
-
-
-def do_forceescape(value):
-    """Enforce HTML escaping.  This will probably double escape variables."""
-    if hasattr(value, '__html__'):
-        value = value.__html__()
-    return escape(text_type(value))
-
-
-def do_urlencode(value):
-    """Escape strings for use in URLs (uses UTF-8 encoding).  It accepts both
-    dictionaries and regular strings as well as pairwise iterables.
-
-    .. versionadded:: 2.7
-    """
-    itemiter = None
-    if isinstance(value, dict):
-        itemiter = iteritems(value)
-    elif not isinstance(value, string_types):
-        try:
-            itemiter = iter(value)
-        except TypeError:
-            pass
-    if itemiter is None:
-        return unicode_urlencode(value)
-    return u'&'.join(unicode_urlencode(k) + '=' +
-                     unicode_urlencode(v, for_qs=True)
-                     for k, v in itemiter)
-
-
-@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 text_type(s).replace(text_type(old), text_type(new), count)
-    if hasattr(old, '__html__') or hasattr(new, '__html__') and \
-       not hasattr(s, '__html__'):
-        s = escape(s)
-    else:
-        s = soft_unicode(s)
-    return s.replace(soft_unicode(old), soft_unicode(new), count)
-
-
-def do_upper(s):
-    """Convert a value to uppercase."""
-    return soft_unicode(s).upper()
-
-
-def do_lower(s):
-    """Convert a value to lowercase."""
-    return soft_unicode(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 = u' '.join(
-        u'%s="%s"' % (escape(key), escape(value))
-        for key, value in iteritems(d)
-        if value is not None and not isinstance(value, Undefined)
-    )
-    if autospace and rv:
-        rv = u' ' + 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_unicode(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_unicode(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.  Per default it sorts ascending, if you pass it
-    true as first argument it will reverse the sorting.
-
-    If the iterable is made of strings the third parameter can be used to
-    control the case sensitiveness of the comparison which is disabled by
-    default.
-
-    .. sourcecode:: jinja
-
-        {% for item in iterable|sort %}
-            ...
-        {% endfor %}
-
-    It is also possible to sort by an attribute (for example to sort
-    by the date of an object) by specifying the `attribute` parameter:
-
-    .. sourcecode:: jinja
-
-        {% for item in iterable|sort(attribute='date') %}
-            ...
-        {% endfor %}
-
-    .. versionchanged:: 2.6
-       The `attribute` parameter was added.
-    """
-    key_func = make_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 the given iterable.
-
-    .. sourcecode:: jinja
-
-        {{ ['foo', 'bar', 'foobar', 'FooBar']|unique }}
-            -> ['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,
-        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 max 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=u'', 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) }}
-    """
-    if isinstance(value, Undefined) or (boolean and not value):
-        return default_value
-    return value
-
-
-@evalcontextfilter
-def do_join(eval_ctx, value, d=u'', 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 = imap(make_attrgetter(eval_ctx.environment, attribute), value)
-
-    # no automatic escaping?  joining is a lot eaiser then
-    if not eval_ctx.autoescape:
-        return text_type(d).join(imap(text_type, 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] = text_type(item)
-        if do_escape:
-            d = escape(d)
-        else:
-            d = text_type(d)
-        return d.join(value)
-
-    # no html involved, to normal joining
-    return soft_unicode(d).join(imap(soft_unicode, value))
-
-
-def do_center(value, width=80):
-    """Centers the value in a field of a given width."""
-    return text_type(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."""
-    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 = binary and 1024 or 1000
-    prefixes = [
-        (binary and 'KiB' or 'kB'),
-        (binary and 'MiB' or 'MB'),
-        (binary and 'GiB' or 'GB'),
-        (binary and 'TiB' or 'TB'),
-        (binary and 'PiB' or 'PB'),
-        (binary and 'EiB' or 'EB'),
-        (binary and 'ZiB' or 'ZB'),
-        (binary and 'YiB' or 'YB')
-    ]
-    if bytes == 1:
-        return '1 Byte'
-    elif bytes < base:
-        return '%d Bytes' % bytes
-    else:
-        for i, prefix in enumerate(prefixes):
-            unit = base ** (i + 2)
-            if bytes < unit:
-                return '%.1f %s' % ((base * bytes / unit), prefix)
-        return '%.1f %s' % ((base * bytes / unit), prefix)
-
-
-def do_pprint(value, verbose=False):
-    """Pretty print a variable. Useful for debugging.
-
-    With Jinja 1.2 onwards you can pass it a parameter.  If this parameter
-    is truthy the output will be more verbose (this requires `pretty`)
-    """
-    return pformat(value, verbose=verbose)
-
-
-@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, indentfirst=None
-):
-    """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``.
-    """
-    if indentfirst is not None:
-        warnings.warn(DeprecationWarning(
-            'The "indentfirst" argument is renamed to "first".'
-        ), stacklevel=2)
-        first = indentfirst
-
-    s += u'\n'  # this quirk is necessary for splitlines method
-    indention = u' ' * width
-
-    if blank:
-        rv = (u'\n' + indention).join(s.splitlines())
-    else:
-        lines = s.splitlines()
-        rv = lines.pop(0)
-
-        if lines:
-            rv += u'\n' + u'\n'.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 Jinja2 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), 'expected length >= %s, got %s' % (len(end), length)
-    assert leeway >= 0, 'expected leeway >= 0, got %s' % 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):
-    """
-    Return a copy of the string passed to the filter wrapped after
-    ``79`` characters.  You can override this default using the first
-    parameter.  If you set the second parameter to `false` Jinja will not
-    split words apart if they are longer than `width`. By default, the newlines
-    will be the default newlines for the environment, but this can be changed
-    using the wrapstring keyword argument.
-
-    .. versionadded:: 2.7
-       Added support for the `wrapstring` parameter.
-    """
-    if not wrapstring:
-        wrapstring = environment.newline_sequence
-    import textwrap
-    return wrapstring.join(textwrap.wrap(s, width=width, expand_tabs=False,
-                                   replace_whitespace=False,
-                                   break_long_words=break_long_words))
-
-
-def do_wordcount(s):
-    """Count the words in that string."""
-    return len(_word_re.findall(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, string_types):
-            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 python string formatting on an object:
-
-    .. sourcecode:: jinja
-
-        {{ "%s - %s"|format("Hello?", "Foo!") }}
-            -> Hello? - Foo!
-    """
-    if args and kwargs:
-        raise FilterArgumentError('can\'t handle positional and keyword '
-                                  'arguments at the same time')
-    return soft_unicode(value) % (kwargs or args)
-
-
-def do_trim(value):
-    """Strip leading and trailing whitespace."""
-    return soft_unicode(value).strip()
-
-
-def do_striptags(value):
-    """Strip SGML/XML tags and replace adjacent whitespace by one space.
-    """
-    if hasattr(value, '__html__'):
-        value = value.__html__()
-    return Markup(text_type(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="columwrapper">
-          {%- 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 not method 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 a common attribute.
-
-    If you for example have a list of dicts or objects that represent persons
-    with `gender`, `first_name` and `last_name` attributes and you want to
-    group all users by genders you can do something like the following
-    snippet:
-
-    .. sourcecode:: html+jinja
-
-        <ul>
-        {% for group in persons|groupby('gender') %}
-            <li>{{ group.grouper }}<ul>
-            {% for person in group.list %}
-                <li>{{ person.first_name }} {{ person.last_name }}</li>
-            {% endfor %}</ul></li>
-        {% endfor %}
-        </ul>
-
-    Additionally it's possible to use tuple unpacking for the grouper and
-    list:
-
-    .. sourcecode:: html+jinja
-
-        <ul>
-        {% for grouper, list in persons|groupby('gender') %}
-            ...
-        {% endfor %}
-        </ul>
-
-    As you can see the item we're grouping by is stored in the `grouper`
-    attribute and the `list` contains all the objects that have this grouper
-    in common.
-
-    .. versionchanged:: 2.6
-       It's now possible to use dotted notation to group by the child
-       attribute of another attribute.
-    """
-    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 = imap(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 text_type(value)
-
-
-def do_reverse(value):
-    """Reverse the object or return an iterator that iterates over it the other
-    way round.
-    """
-    if isinstance(value, string_types):
-        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(', ') }}
-
-    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(', ') }}
-
-    .. 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") }}
-
-    .. 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") }}
-
-    .. 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") }}
-
-    .. 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") }}
-
-    .. 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')
-        if kwargs:
-            raise FilterArgumentError('Unexpected keyword argument %r' %
-                next(iter(kwargs)))
-        func = make_attrgetter(context.environment, attribute)
-    else:
-        try:
-            name = args[2]
-            args = args[3:]
-        except LookupError:
-            raise FilterArgumentError('map requires a filter argument')
-        func = lambda item: 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
-        transfunc = lambda x: x
-
-    try:
-        name = args[2 + off]
-        args = args[3 + off:]
-        func = lambda item: 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_unicode,
-    '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/python/jinja2/idtracking.py b/python/jinja2/idtracking.py
deleted file mode 100644
index 491bfe0..0000000
--- a/python/jinja2/idtracking.py
+++ /dev/null
@@ -1,286 +0,0 @@
-from jinja2.visitor import NodeVisitor
-from jinja2._compat import iteritems
-
-
-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(object):
-
-    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 = 'l_%d_%s' % (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 unknown to the frame (%r)' % name)
-        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 iteritems(stores):
-            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 iteritems(self.loads):
-                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('Cannot find symbols for %r' %
-                                  node.__class__.__name__)
-
-
-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/python/jinja2/lexer.py b/python/jinja2/lexer.py
deleted file mode 100644
index 6fd135d..0000000
--- a/python/jinja2/lexer.py
+++ /dev/null
@@ -1,739 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.lexer
-    ~~~~~~~~~~~~
-
-    This module implements a Jinja / Python combination lexer. The
-    `Lexer` class provided by this module is used to do some preprocessing
-    for Jinja.
-
-    On the one hand it filters out invalid operators like the bitshift
-    operators we don't allow in templates. On the other hand it separates
-    template code and python code in expressions.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import re
-from collections import deque
-from operator import itemgetter
-
-from jinja2._compat import implements_iterator, intern, iteritems, text_type
-from jinja2.exceptions import TemplateSyntaxError
-from jinja2.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+', re.U)
-string_re = re.compile(r"('([^'\\]*(?:\\.[^'\\]*)*)'"
-                       r'|"([^"\\]*(?:\\.[^"\\]*)*)")', re.S)
-integer_re = re.compile(r'\d+')
-
-try:
-    # check if this Python supports Unicode identifiers
-    compile('föö', '<unknown>', 'eval')
-except SyntaxError:
-    # no Unicode support, use ASCII identifiers
-    name_re = re.compile(r'[a-zA-Z_][a-zA-Z0-9_]*')
-    check_ident = False
-else:
-    # Unicode support, build a pattern to match valid characters, and set flag
-    # to use str.isidentifier to validate during lexing
-    from jinja2 import _identifier
-    name_re = re.compile(r'[\w{0}]+'.format(_identifier.pattern))
-    check_ident = True
-    # remove the pattern from memory after building the regex
-    import sys
-    del sys.modules['jinja2._identifier']
-    import jinja2
-    del jinja2._identifier
-    del _identifier
-
-float_re = re.compile(r'(?<!\.)\d+\.\d+')
-newline_re = re.compile(r'(\r\n|\r|\n)')
-
-# 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 = dict([(v, k) for k, v in iteritems(operators)])
-assert len(operators) == len(reverse_operators), 'operators dropped'
-operator_re = re.compile('(%s)' % '|'.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 == '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 == '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), 'comment',
-         e(environment.comment_start_string)),
-        (len(environment.block_start_string), 'block',
-         e(environment.block_start_string)),
-        (len(environment.variable_start_string), 'variable',
-         e(environment.variable_start_string))
-    ]
-
-    if environment.line_statement_prefix is not None:
-        rules.append((len(environment.line_statement_prefix), 'linestatement',
-                      r'^[ \t\v]*' + e(environment.line_statement_prefix)))
-    if environment.line_comment_prefix is not None:
-        rules.append((len(environment.line_comment_prefix), 'linecomment',
-                      r'(?:^|(?<=\S))[^\S\r\n]*' +
-                      e(environment.line_comment_prefix)))
-
-    return [x[1:] for x in sorted(rules, reverse=True)]
-
-
-class Failure(object):
-    """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 'Token(%r, %r, %r)' % (
-            self.lineno,
-            self.type,
-            self.value
-        )
-
-
-@implements_iterator
-class TokenStreamIterator(object):
-    """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
-
-
-@implements_iterator
-class TokenStream(object):
-    """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
-
-    eos = property(lambda x: not x, doc="Are we at the end of the stream?")
-
-    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 x 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('unexpected end of template, '
-                                          'expected %r.' % expr,
-                                          self.current.lineno,
-                                          self.name, self.filename)
-            raise TemplateSyntaxError("expected token %r, got %r" %
-                                      (expr, describe_token(self.current)),
-                                      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 Lexer(object):
-    """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
-        c = lambda x: re.compile(x, re.M | re.S)
-        e = re.escape
-
-        # 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 suffix if trimming is enabled
-        block_suffix_re = environment.trim_blocks and '\\n?' or ''
-
-        # strip leading spaces if lstrip_blocks is enabled
-        prefix_re = {}
-        if environment.lstrip_blocks:
-            # use '{%+' to manually disable lstrip_blocks behavior
-            no_lstrip_re = e('+')
-            # detect overlap between block and variable or comment strings
-            block_diff = c(r'^%s(.*)' % e(environment.block_start_string))
-            # make sure we don't mistake a block for a variable or a comment
-            m = block_diff.match(environment.comment_start_string)
-            no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
-            m = block_diff.match(environment.variable_start_string)
-            no_lstrip_re += m and r'|%s' % e(m.group(1)) or ''
-
-            # detect overlap between comment and variable strings
-            comment_diff = c(r'^%s(.*)' % e(environment.comment_start_string))
-            m = comment_diff.match(environment.variable_start_string)
-            no_variable_re = m and r'(?!%s)' % e(m.group(1)) or ''
-
-            lstrip_re = r'^[ \t]*'
-            block_prefix_re = r'%s%s(?!%s)|%s\+?' % (
-                    lstrip_re,
-                    e(environment.block_start_string),
-                    no_lstrip_re,
-                    e(environment.block_start_string),
-                    )
-            comment_prefix_re = r'%s%s%s|%s\+?' % (
-                    lstrip_re,
-                    e(environment.comment_start_string),
-                    no_variable_re,
-                    e(environment.comment_start_string),
-                    )
-            prefix_re['block'] = block_prefix_re
-            prefix_re['comment'] = comment_prefix_re
-        else:
-            block_prefix_re = '%s' % e(environment.block_start_string)
-
-        self.newline_sequence = environment.newline_sequence
-        self.keep_trailing_newline = environment.keep_trailing_newline
-
-        # global lexing rules
-        self.rules = {
-            'root': [
-                # directives
-                (c('(.*?)(?:%s)' % '|'.join(
-                    [r'(?P<raw_begin>(?:\s*%s\-|%s)\s*raw\s*(?:\-%s\s*|%s))' % (
-                        e(environment.block_start_string),
-                        block_prefix_re,
-                        e(environment.block_end_string),
-                        e(environment.block_end_string)
-                    )] + [
-                        r'(?P<%s_begin>\s*%s\-|%s)' % (n, r, prefix_re.get(n,r))
-                        for n, r in root_tag_rules
-                    ])), (TOKEN_DATA, '#bygroup'), '#bygroup'),
-                # data
-                (c('.+'), TOKEN_DATA, None)
-            ],
-            # comments
-            TOKEN_COMMENT_BEGIN: [
-                (c(r'(.*?)((?:\-%s\s*|%s)%s)' % (
-                    e(environment.comment_end_string),
-                    e(environment.comment_end_string),
-                    block_suffix_re
-                )), (TOKEN_COMMENT, TOKEN_COMMENT_END), '#pop'),
-                (c('(.)'), (Failure('Missing end of comment tag'),), None)
-            ],
-            # blocks
-            TOKEN_BLOCK_BEGIN: [
-                (c(r'(?:\-%s\s*|%s)%s' % (
-                    e(environment.block_end_string),
-                    e(environment.block_end_string),
-                    block_suffix_re
-                )), TOKEN_BLOCK_END, '#pop'),
-            ] + tag_rules,
-            # variables
-            TOKEN_VARIABLE_BEGIN: [
-                (c(r'\-%s\s*|%s' % (
-                    e(environment.variable_end_string),
-                    e(environment.variable_end_string)
-                )), TOKEN_VARIABLE_END, '#pop')
-            ] + tag_rules,
-            # raw block
-            TOKEN_RAW_BEGIN: [
-                (c(r'(.*?)((?:\s*%s\-|%s)\s*endraw\s*(?:\-%s\s*|%s%s))' % (
-                    e(environment.block_start_string),
-                    block_prefix_re,
-                    e(environment.block_end_string),
-                    e(environment.block_end_string),
-                    block_suffix_re
-                )), (TOKEN_DATA, TOKEN_RAW_END), '#pop'),
-                (c('(.)'), (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):
-        """Called for strings and template data to normalize it to unicode."""
-        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 == 'linestatement_begin':
-                token = 'block_begin'
-            elif token == 'linestatement_end':
-                token = 'block_end'
-            # we are not interested in those tokens in the parser
-            elif token in ('raw_begin', 'raw_end'):
-                continue
-            elif token == 'data':
-                value = self._normalize_newlines(value)
-            elif token == 'keyword':
-                token = value
-            elif token == 'name':
-                value = str(value)
-                if check_ident and not value.isidentifier():
-                    raise TemplateSyntaxError(
-                        'Invalid character in identifier',
-                        lineno, name, filename)
-            elif 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 == 'integer':
-                value = int(value)
-            elif token == 'float':
-                value = float(value)
-            elif 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.
-        """
-        source = text_type(source)
-        lines = source.splitlines()
-        if self.keep_trailing_newline and source:
-            for newline in ('\r\n', '\r', '\n'):
-                if source.endswith(newline):
-                    lines.append('')
-                    break
-        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')
-        else:
-            state = 'root'
-        statetokens = self.rules[stack[-1]]
-        source_length = len(source)
-
-        balancing_stack = []
-
-        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 ('variable_end', 'block_end',
-                              'linestatement_end'):
-                    continue
-
-                # tuples support more options
-                if isinstance(tokens, tuple):
-                    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 iteritems(m.groupdict()):
-                                if value is not None:
-                                    yield lineno, key, value
-                                    lineno += value.count('\n')
-                                    break
-                            else:
-                                raise RuntimeError('%r wanted to resolve '
-                                                   'the token dynamically'
-                                                   ' but no group matched'
-                                                   % regex)
-                        # normal group
-                        else:
-                            data = m.group(idx + 1)
-                            if data or token not in ignore_if_empty:
-                                yield lineno, token, data
-                            lineno += data.count('\n')
-
-                # strings as token just are yielded as it.
-                else:
-                    data = m.group()
-                    # update brace/parentheses balance
-                    if tokens == '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('unexpected \'%s\'' %
-                                                          data, lineno, name,
-                                                          filename)
-                            expected_op = balancing_stack.pop()
-                            if expected_op != data:
-                                raise TemplateSyntaxError('unexpected \'%s\', '
-                                                          'expected \'%s\'' %
-                                                          (data, expected_op),
-                                                          lineno, name,
-                                                          filename)
-                    # yield items
-                    if data or tokens not in ignore_if_empty:
-                        yield lineno, tokens, data
-                    lineno += data.count('\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 iteritems(m.groupdict()):
-                            if value is not None:
-                                stack.append(key)
-                                break
-                        else:
-                            raise RuntimeError('%r wanted to resolve the '
-                                               'new state dynamically but'
-                                               ' no group matched' %
-                                               regex)
-                    # 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('%r yielded empty string without '
-                                       'stack change' % regex)
-                # 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('unexpected char %r at %d' %
-                                          (source[pos], pos), lineno,
-                                          name, filename)
diff --git a/python/jinja2/loaders.py b/python/jinja2/loaders.py
deleted file mode 100644
index 4c79793..0000000
--- a/python/jinja2/loaders.py
+++ /dev/null
@@ -1,481 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.loaders
-    ~~~~~~~~~~~~~~
-
-    Jinja loader classes.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import os
-import sys
-import weakref
-from types import ModuleType
-from os import path
-from hashlib import sha1
-from jinja2.exceptions import TemplateNotFound
-from jinja2.utils import open_if_exists, internalcode
-from jinja2._compat import string_types, iteritems
-
-
-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 path.sep in piece \
-           or (path.altsep and path.altsep in piece) or \
-           piece == path.pardir:
-            raise TemplateNotFound(template)
-        elif piece and piece != '.':
-            pieces.append(piece)
-    return pieces
-
-
-class BaseLoader(object):
-    """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 file(path) as f:
-                    source = f.read().decode('utf-8')
-                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 unicode string or a ASCII bytestring.  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('%s cannot provide access to the source' %
-                               self.__class__.__name__)
-        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):
-    """Loads templates from the file system.  This loader can find templates
-    in folders on the file system and is the preferred way to load them.
-
-    The loader takes the path to the templates as string, or if multiple
-    locations are wanted a list of them which is then looked up in the
-    given order::
-
-    >>> loader = FileSystemLoader('/path/to/templates')
-    >>> loader = FileSystemLoader(['/path/to/templates', '/other/path'])
-
-    Per default the template encoding is ``'utf-8'`` which can be changed
-    by setting the `encoding` parameter to something else.
-
-    To follow symbolic links, set the *followlinks* parameter to ``True``::
-
-    >>> loader = FileSystemLoader('/path/to/templates', followlinks=True)
-
-    .. versionchanged:: 2.8+
-       The *followlinks* parameter was added.
-    """
-
-    def __init__(self, searchpath, encoding='utf-8', followlinks=False):
-        if isinstance(searchpath, string_types):
-            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 = 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 = path.getmtime(filename)
-
-            def uptodate():
-                try:
-                    return 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, dirnames, 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 python eggs or packages.  It is constructed with
-    the name of the python package and the path to the templates in that
-    package::
-
-        loader = PackageLoader('mypackage', 'views')
-
-    If the package path is not given, ``'templates'`` is assumed.
-
-    Per default the template encoding is ``'utf-8'`` which can be changed
-    by setting the `encoding` parameter to something else.  Due to the nature
-    of eggs it's only possible to reload templates if the package was loaded
-    from the file system and not a zip file.
-    """
-
-    def __init__(self, package_name, package_path='templates',
-                 encoding='utf-8'):
-        from pkg_resources import DefaultProvider, ResourceManager, \
-                                  get_provider
-        provider = get_provider(package_name)
-        self.encoding = encoding
-        self.manager = ResourceManager()
-        self.filesystem_bound = isinstance(provider, DefaultProvider)
-        self.provider = provider
-        self.package_path = package_path
-
-    def get_source(self, environment, template):
-        pieces = split_template_path(template)
-        p = '/'.join((self.package_path,) + tuple(pieces))
-        if not self.provider.has_resource(p):
-            raise TemplateNotFound(template)
-
-        filename = uptodate = None
-        if self.filesystem_bound:
-            filename = self.provider.get_resource_filename(self.manager, p)
-            mtime = path.getmtime(filename)
-            def uptodate():
-                try:
-                    return path.getmtime(filename) == mtime
-                except OSError:
-                    return False
-
-        source = self.provider.get_resource_string(self.manager, p)
-        return source.decode(self.encoding), filename, uptodate
-
-    def list_templates(self):
-        path = self.package_path
-        if path[:2] == './':
-            path = path[2:]
-        elif path == '.':
-            path = ''
-        offset = len(path)
-        results = []
-        def _walk(path):
-            for filename in self.provider.resource_listdir(path):
-                fullname = path + '/' + filename
-                if self.provider.resource_isdir(fullname):
-                    _walk(fullname)
-                else:
-                    results.append(fullname[offset:].lstrip('/'))
-        _walk(path)
-        results.sort()
-        return results
-
-
-class DictLoader(BaseLoader):
-    """Loads a template from a python dict.  It's passed a dict of unicode
-    strings bound to template names.  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
-    an unicode 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, string_types):
-            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 iteritems(self.mapping):
-            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 = '_jinja2_module_templates_%x' % id(self)
-
-        # create a fake module that looks for the templates in the
-        # path given.
-        mod = _TemplateModule(package_name)
-        if isinstance(path, string_types):
-            path = [path]
-        else:
-            path = list(path)
-        mod.__path__ = 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 = '%s.%s' % (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/python/jinja2/meta.py b/python/jinja2/meta.py
deleted file mode 100644
index 7421914..0000000
--- a/python/jinja2/meta.py
+++ /dev/null
@@ -1,106 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.meta
-    ~~~~~~~~~~~
-
-    This module implements various functions that exposes information about
-    templates that might be interesting for various kinds of applications.
-
-    :copyright: (c) 2017 by the Jinja Team, see AUTHORS for more details.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2 import nodes
-from jinja2.compiler import CodeGenerator
-from jinja2._compat import string_types, iteritems
-
-
-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 iteritems(frame.symbols.loads):
-            if action == 'resolve':
-                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) == set(['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, string_types):
-                            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, string_types):
-            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, string_types):
-                    yield template_name
-        # something else we don't care about, we could warn here
-        else:
-            yield None
diff --git a/python/jinja2/nativetypes.py b/python/jinja2/nativetypes.py
deleted file mode 100644
index fe17e41..0000000
--- a/python/jinja2/nativetypes.py
+++ /dev/null
@@ -1,220 +0,0 @@
-import sys
-from ast import literal_eval
-from itertools import islice, chain
-from jinja2 import nodes
-from jinja2._compat import text_type
-from jinja2.compiler import CodeGenerator, has_safe_repr
-from jinja2.environment import Environment, Template
-from jinja2.utils import concat, escape
-
-
-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.
-    """
-    head = list(islice(nodes, 2))
-
-    if not head:
-        return None
-
-    if len(head) == 1:
-        out = head[0]
-    else:
-        out = u''.join([text_type(v) for v in chain(head, nodes)])
-
-    try:
-        return literal_eval(out)
-    except (ValueError, SyntaxError, MemoryError):
-        return out
-
-
-class NativeCodeGenerator(CodeGenerator):
-    """A code generator which avoids injecting ``to_string()`` calls around the
-    internal code Jinja uses to render templates.
-    """
-
-    def visit_Output(self, node, frame):
-        """Same as :meth:`CodeGenerator.visit_Output`, but do not call
-        ``to_string`` on output nodes in generated code.
-        """
-        if self.has_known_extends and frame.require_output_check:
-            return
-
-        finalize = self.environment.finalize
-        finalize_context = getattr(finalize, 'contextfunction', False)
-        finalize_eval = getattr(finalize, 'evalcontextfunction', False)
-        finalize_env = getattr(finalize, 'environmentfunction', False)
-
-        if finalize is not None:
-            if finalize_context or finalize_eval:
-                const_finalize = None
-            elif finalize_env:
-                def const_finalize(x):
-                    return finalize(self.environment, x)
-            else:
-                const_finalize = finalize
-        else:
-            def const_finalize(x):
-                return x
-
-        # If we are inside a frame that requires output checking, we do so.
-        outdent_later = False
-
-        if frame.require_output_check:
-            self.writeline('if parent_template is None:')
-            self.indent()
-            outdent_later = True
-
-        # Try to evaluate as many chunks as possible into a static string at
-        # compile time.
-        body = []
-
-        for child in node.nodes:
-            try:
-                if const_finalize is None:
-                    raise nodes.Impossible()
-
-                const = child.as_const(frame.eval_ctx)
-                if not has_safe_repr(const):
-                    raise nodes.Impossible()
-            except nodes.Impossible:
-                body.append(child)
-                continue
-
-            # the frame can't be volatile here, because otherwise the as_const
-            # function would raise an Impossible exception at that point
-            try:
-                if frame.eval_ctx.autoescape:
-                    if hasattr(const, '__html__'):
-                        const = const.__html__()
-                    else:
-                        const = escape(const)
-
-                const = const_finalize(const)
-            except Exception:
-                # if something goes wrong here we evaluate the node at runtime
-                # for easier debugging
-                body.append(child)
-                continue
-
-            if body and isinstance(body[-1], list):
-                body[-1].append(const)
-            else:
-                body.append([const])
-
-        # if we have less than 3 nodes or a buffer we yield or extend/append
-        if len(body) < 3 or frame.buffer is not None:
-            if frame.buffer is not None:
-                # for one item we append, for more we extend
-                if len(body) == 1:
-                    self.writeline('%s.append(' % frame.buffer)
-                else:
-                    self.writeline('%s.extend((' % frame.buffer)
-
-                self.indent()
-
-            for item in body:
-                if isinstance(item, list):
-                    val = repr(native_concat(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)
-
-                    close = 0
-
-                    if finalize is not None:
-                        self.write('environment.finalize(')
-
-                        if finalize_context:
-                            self.write('context, ')
-
-                        close += 1
-
-                    self.visit(item, frame)
-
-                    if close > 0:
-                        self.write(')' * close)
-
-                    if frame.buffer is not None:
-                        self.write(',')
-
-            if frame.buffer is not None:
-                # close the open parentheses
-                self.outdent()
-                self.writeline(len(body) == 1 and ')' or '))')
-
-        # otherwise we create a format string as this is faster in that case
-        else:
-            format = []
-            arguments = []
-
-            for item in body:
-                if isinstance(item, list):
-                    format.append(native_concat(item).replace('%', '%%'))
-                else:
-                    format.append('%s')
-                    arguments.append(item)
-
-            self.writeline('yield ')
-            self.write(repr(concat(format)) + ' % (')
-            self.indent()
-
-            for argument in arguments:
-                self.newline(argument)
-                close = 0
-
-                if finalize is not None:
-                    self.write('environment.finalize(')
-
-                    if finalize_context:
-                        self.write('context, ')
-                    elif finalize_eval:
-                        self.write('context.eval_ctx, ')
-                    elif finalize_env:
-                        self.write('environment, ')
-
-                    close += 1
-
-                self.visit(argument, frame)
-                self.write(')' * close + ', ')
-
-            self.outdent()
-            self.writeline(')')
-
-        if outdent_later:
-            self.outdent()
-
-
-class NativeTemplate(Template):
-    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:
-            exc_info = sys.exc_info()
-
-        return self.environment.handle_exception(exc_info, True)
-
-
-class NativeEnvironment(Environment):
-    """An environment that renders templates to native Python types."""
-
-    code_generator_class = NativeCodeGenerator
-    template_class = NativeTemplate
diff --git a/python/jinja2/nodes.py b/python/jinja2/nodes.py
deleted file mode 100644
index 4d9a01a..0000000
--- a/python/jinja2/nodes.py
+++ /dev/null
@@ -1,999 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.nodes
-    ~~~~~~~~~~~~
-
-    This module implements additional nodes derived from the ast base node.
-
-    It also provides some node tree helper functions like `in_lineno` and
-    `get_nodes` used by the parser and translator in order to normalize
-    python and jinja nodes.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import types
-import operator
-
-from collections import deque
-from jinja2.utils import Markup
-from jinja2._compat import izip, with_metaclass, text_type, PY2
-
-
-#: the types we support for context functions
-_context_function_types = (types.FunctionType, types.MethodType)
-
-
-_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__(cls, name, bases, d):
-        for attr in 'fields', 'attributes':
-            storage = []
-            storage.extend(getattr(bases[0], 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__(cls, name, bases, d)
-
-
-class EvalContext(object):
-    """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(with_metaclass(NodeType, object)):
-    """Baseclass for all Jinja2 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 instanciable')
-        if fields:
-            if len(fields) != len(self.fields):
-                if not self.fields:
-                    raise TypeError('%r takes 0 arguments' %
-                                    self.__class__.__name__)
-                raise TypeError('%r takes 0 or %d argument%s' % (
-                    self.__class__.__name__,
-                    len(self.fields),
-                    len(self.fields) != 1 and 's' or ''
-                ))
-            for name, arg in izip(self.fields, fields):
-                setattr(self, name, arg)
-        for attr in self.attributes:
-            setattr(self, attr, attributes.pop(attr, None))
-        if attributes:
-            raise TypeError('unknown attribute %r' %
-                            next(iter(attributes)))
-
-    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 field, 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
-            for result in child.find_all(node_type):
-                yield result
-
-    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):
-        return type(self) is type(other) and \
-               tuple(self.iter_fields()) == tuple(other.iter_fields())
-
-    def __ne__(self, other):
-        return not self.__eq__(other)
-
-    # Restore Python 2 hashing behavior on Python 3
-    __hash__ = object.__hash__
-
-    def __repr__(self):
-        return '%s(%s)' % (
-            self.__class__.__name__,
-            ', '.join('%s=%r' % (arg, getattr(self, arg, None)) for
-                      arg in self.fields)
-        )
-
-    def dump(self):
-        def _dump(node):
-            if not isinstance(node, Node):
-                buf.append(repr(node))
-                return
-
-            buf.append('nodes.%s(' % 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):
-        rv = self.value
-        if PY2 and type(rv) is text_type and \
-           self.environment.policies['compiler.ascii_str']:
-            try:
-                rv = rv.encode('ascii')
-            except UnicodeError:
-                pass
-        return rv
-
-    @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()
-
-        # we have to be careful here because we call filter_ below.
-        # if this variable would be called filter, 2to3 would wrap the
-        # call in a list beause it is assuming we are talking about the
-        # builtin filter function here which no longer returns a list in
-        # python 3.  because of that, do not rename filter_ to filter!
-        filter_ = self.environment.filters.get(self.name)
-
-        if filter_ is None or getattr(filter_, 'contextfilter', False):
-            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):
-            args.insert(0, eval_ctx)
-        elif getattr(filter_, 'environmentfilter', False):
-            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
-    unicode.
-    """
-    fields = ('nodes',)
-
-    def as_const(self, eval_ctx=None):
-        eval_ctx = get_eval_context(self, eval_ctx)
-        return ''.join(text_type(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)
-                value = new_value
-        except Exception:
-            raise Impossible()
-        return result
-
-
-class Operand(Helper):
-    """Holds an operator and an expression."""
-    fields = ('op', 'expr')
-
-if __debug__:
-    Operand.__doc__ += '\nThe following operators are available: ' + \
-        ', '.join(sorted('``%s``' % x for x in set(_binop_to_func) |
-                  set(_uaop_to_func) | set(_cmpop_to_func)))
-
-
-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'))
-    """
-
-
-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/python/jinja2/optimizer.py b/python/jinja2/optimizer.py
deleted file mode 100644
index 65ab3ce..0000000
--- a/python/jinja2/optimizer.py
+++ /dev/null
@@ -1,49 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.optimizer
-    ~~~~~~~~~~~~~~~~
-
-    The jinja optimizer is currently trying to constant fold a few expressions
-    and modify the AST in place so that it should be easier to evaluate it.
-
-    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 scoping.
-
-    The solution would be a second syntax tree that has the scoping rules stored.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-from jinja2 import nodes
-from jinja2.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 fold(self, node, eval_ctx=None):
-        """Do constant folding."""
-        node = self.generic_visit(node)
-        try:
-            return nodes.Const.from_untrusted(node.as_const(eval_ctx),
-                                              lineno=node.lineno,
-                                              environment=self.environment)
-        except nodes.Impossible:
-            return node
-
-    visit_Add = visit_Sub = visit_Mul = visit_Div = visit_FloorDiv = \
-    visit_Pow = visit_Mod = visit_And = visit_Or = visit_Pos = visit_Neg = \
-    visit_Not = visit_Compare = visit_Getitem = visit_Getattr = visit_Call = \
-    visit_Filter = visit_Test = visit_CondExpr = fold
-    del fold
diff --git a/python/jinja2/parser.py b/python/jinja2/parser.py
deleted file mode 100644
index ed00d97..0000000
--- a/python/jinja2/parser.py
+++ /dev/null
@@ -1,903 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.parser
-    ~~~~~~~~~~~~~
-
-    Implements the template parser.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-from jinja2 import nodes
-from jinja2.exceptions import TemplateSyntaxError, TemplateAssertionError
-from jinja2.lexer import describe_token, describe_token_expr
-from jinja2._compat import imap
-
-
-_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(object):
-    """This is the central parsing class Jinja2 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(imap(describe_token_expr, exprs))
-        if end_token_stack:
-            currently_looking = ' or '.join(
-                "'%s'" % describe_token_expr(expr)
-                for expr in end_token_stack[-1])
-        else:
-            currently_looking = None
-
-        if name is None:
-            message = ['Unexpected end of template.']
-        else:
-            message = ['Encountered unknown tag \'%s\'.' % name]
-
-        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, but currently looking '
-                               'for %s.' % currently_looking)
-            else:
-                message.append('Jinja was looking for the following tags: '
-                               '%s.' % currently_looking)
-
-        if self._tag_stack:
-            message.append('The innermost block that needs to be '
-                           'closed is \'%s\'.' % self._tag_stack[-1])
-
-        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, 'fi%d' % 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':
-            lineno = self.stream.current.lineno
-            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 Jinja2 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('can\'t assign to %r' % target.__class__.
-                      __name__.lower(), 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("unexpected '%s'" % describe_token(token), 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:
-            parse = lambda: 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, got \'%s\'' %
-                          describe_token(self.stream.current))
-
-        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', self.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:
-                ensure(dyn_args is None and dyn_kwargs is None)
-                if self.stream.current.type == 'name' and \
-                   self.stream.look().type == 'assign':
-                    key = self.stream.current.value
-                    self.stream.skip(2)
-                    value = self.parse_expression()
-                    kwargs.append(nodes.Keyword(key, value,
-                                                lineno=value.lineno))
-                else:
-                    ensure(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')
-            args = [self.parse_primary()]
-        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/python/jinja2/runtime.py b/python/jinja2/runtime.py
deleted file mode 100644
index f9d7a68..0000000
--- a/python/jinja2/runtime.py
+++ /dev/null
@@ -1,813 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.runtime
-    ~~~~~~~~~~~~~~
-
-    Runtime helpers.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-import sys
-
-from itertools import chain
-from types import MethodType
-
-from jinja2.nodes import EvalContext, _context_function_types
-from jinja2.utils import Markup, soft_unicode, escape, missing, concat, \
-     internalcode, object_type_repr, evalcontextfunction, Namespace
-from jinja2.exceptions import UndefinedError, TemplateRuntimeError, \
-     TemplateNotFound
-from jinja2._compat import imap, text_type, iteritems, \
-     implements_iterator, implements_to_string, string_types, PY2, \
-     with_metaclass
-
-
-# these variables are exported to the template runtime
-__all__ = ['LoopContext', 'TemplateReference', 'Macro', 'Markup',
-           'TemplateRuntimeError', 'missing', 'concat', 'escape',
-           'markup_join', 'unicode_join', 'to_string', 'identity',
-           'TemplateNotFound', 'Namespace']
-
-#: the name of the function that is used to convert something into
-#: a string.  We can just use the text type here.
-to_string = text_type
-
-#: the identity function.  Useful for certain things in the environment
-identity = lambda x: x
-
-_first_iteration = object()
-_last_iteration = object()
-
-
-def markup_join(seq):
-    """Concatenation that escapes if necessary and converts to unicode."""
-    buf = []
-    iterator = imap(soft_unicode, seq)
-    for arg in iterator:
-        buf.append(arg)
-        if hasattr(arg, '__html__'):
-            return Markup(u'').join(chain(buf, iterator))
-    return concat(buf)
-
-
-def unicode_join(seq):
-    """Simple args to unicode conversion and concatenation."""
-    return concat(imap(text_type, seq))
-
-
-def new_context(environment, template_name, blocks, vars=None,
-                shared=None, globals=None, locals=None):
-    """Internal helper to 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 iteritems(locals):
-            if value is not missing:
-                parent[key] = value
-    return environment.context_class(environment, parent, template_name,
-                                     blocks)
-
-
-class TemplateReference(object):
-    """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 '<%s %r>' % (
-            self.__class__.__name__,
-            self.__context.name
-        )
-
-
-def _get_func(x):
-    return getattr(x, '__func__', x)
-
-
-class ContextMeta(type):
-
-    def __new__(cls, name, bases, d):
-        rv = type.__new__(cls, 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
-
-
-class Context(with_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):
-        self.parent = parent
-        self.vars = {}
-        self.environment = environment
-        self.eval_ctx = EvalContext(self.environment, name)
-        self.exported_vars = set()
-        self.name = name
-
-        # 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 = dict((k, [v]) for k, v in iteritems(blocks))
-
-        # 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('there is no parent block '
-                                              'called %r.' % name,
-                                              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 dict((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):
-        """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__'):
-            fn = __obj.__call__
-            for fn_type in ('contextfunction',
-                            'evalcontextfunction',
-                            'environmentfunction'):
-                if hasattr(fn, fn_type):
-                    __obj = fn
-                    break
-
-        if isinstance(__obj, _context_function_types):
-            if getattr(__obj, 'contextfunction', 0):
-                args = (__self,) + args
-            elif getattr(__obj, 'evalcontextfunction', 0):
-                args = (__self.eval_ctx,) + args
-            elif getattr(__obj, 'environmentfunction', 0):
-                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 iteritems(self.blocks))
-        return context
-
-    def _all(meth):
-        proxy = lambda self: 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')
-
-    # not available on python 3
-    if PY2:
-        iterkeys = _all('iterkeys')
-        itervalues = _all('itervalues')
-        iteritems = _all('iteritems')
-    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 '<%s %s of %r>' % (
-            self.__class__.__name__,
-            repr(self.get_all()),
-            self.name
-        )
-
-
-# register the context as mapping if possible
-try:
-    from collections import Mapping
-    Mapping.register(Context)
-except ImportError:
-    pass
-
-
-class BlockReference(object):
-    """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('there is no parent block called %r.' %
-                          self.name, 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 LoopContextBase(object):
-    """A loop context for dynamic iteration."""
-
-    _before = _first_iteration
-    _current = _first_iteration
-    _after = _last_iteration
-    _length = None
-
-    def __init__(self, undefined, recurse=None, depth0=0):
-        self._undefined = undefined
-        self._recurse = recurse
-        self.index0 = -1
-        self.depth0 = depth0
-        self._last_checked_value = missing
-
-    def cycle(self, *args):
-        """Cycles among the arguments with the current loop index."""
-        if not args:
-            raise TypeError('no items for cycling given')
-        return args[self.index0 % len(args)]
-
-    def changed(self, *value):
-        """Checks whether the value has changed since the last call."""
-        if self._last_checked_value != value:
-            self._last_checked_value = value
-            return True
-        return False
-
-    first = property(lambda x: x.index0 == 0)
-    last = property(lambda x: x._after is _last_iteration)
-    index = property(lambda x: x.index0 + 1)
-    revindex = property(lambda x: x.length - x.index0)
-    revindex0 = property(lambda x: x.length - x.index)
-    depth = property(lambda x: x.depth0 + 1)
-
-    @property
-    def previtem(self):
-        if self._before is _first_iteration:
-            return self._undefined('there is no previous item')
-        return self._before
-
-    @property
-    def nextitem(self):
-        if self._after is _last_iteration:
-            return self._undefined('there is no next item')
-        return self._after
-
-    def __len__(self):
-        return self.length
-
-    @internalcode
-    def loop(self, iterable):
-        if self._recurse is None:
-            raise TypeError('Tried to call non recursive loop.  Maybe you '
-                            "forgot the 'recursive' modifier.")
-        return self._recurse(iterable, self._recurse, self.depth0 + 1)
-
-    # a nifty trick to enhance the error message if someone tried to call
-    # the the loop without or with too many arguments.
-    __call__ = loop
-    del loop
-
-    def __repr__(self):
-        return '<%s %r/%r>' % (
-            self.__class__.__name__,
-            self.index,
-            self.length
-        )
-
-
-class LoopContext(LoopContextBase):
-
-    def __init__(self, iterable, undefined, recurse=None, depth0=0):
-        LoopContextBase.__init__(self, undefined, recurse, depth0)
-        self._iterator = iter(iterable)
-
-        # try to get the length of the iterable early.  This must be done
-        # here because there are some broken iterators around where there
-        # __len__ is the number of iterations left (i'm looking at your
-        # listreverseiterator!).
-        try:
-            self._length = len(iterable)
-        except (TypeError, AttributeError):
-            self._length = None
-        self._after = self._safe_next()
-
-    @property
-    def length(self):
-        if self._length is None:
-            # if was not possible to get the length of the iterator when
-            # the loop context was created (ie: iterating over a generator)
-            # we have to convert the iterable into a sequence and use the
-            # length of that + the number of iterations so far.
-            iterable = tuple(self._iterator)
-            self._iterator = iter(iterable)
-            iterations_done = self.index0 + 2
-            self._length = len(iterable) + iterations_done
-        return self._length
-
-    def __iter__(self):
-        return LoopContextIterator(self)
-
-    def _safe_next(self):
-        try:
-            return next(self._iterator)
-        except StopIteration:
-            return _last_iteration
-
-
-@implements_iterator
-class LoopContextIterator(object):
-    """The iterator for a loop context."""
-    __slots__ = ('context',)
-
-    def __init__(self, context):
-        self.context = context
-
-    def __iter__(self):
-        return self
-
-    def __next__(self):
-        ctx = self.context
-        ctx.index0 += 1
-        if ctx._after is _last_iteration:
-            raise StopIteration()
-        ctx._before = ctx._current
-        ctx._current = ctx._after
-        ctx._after = ctx._safe_next()
-        return ctx._current, ctx
-
-
-class Macro(object):
-    """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
-        # problemtic for macros because if a macro is safe or not not so
-        # much depends on the escape mode when it was defined but 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 anwyays.  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 idx, name in enumerate(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('macro %r was invoked with two values for '
-                                'the special caller argument.  This is '
-                                'most likely a bug.' % self.name)
-            raise TypeError('macro %r takes no keyword argument %r' %
-                            (self.name, next(iter(kwargs))))
-        if self.catch_varargs:
-            arguments.append(args[self._argument_count:])
-        elif len(args) > self._argument_count:
-            raise TypeError('macro %r takes not more than %d argument(s)' %
-                            (self.name, len(self.arguments)))
-
-        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):
-        return '<%s %s>' % (
-            self.__class__.__name__,
-            self.name is None and 'anonymous' or repr(self.name)
-        )
-
-
-@implements_to_string
-class Undefined(object):
-    """The default undefined type.  This undefined type can be printed and
-    iterated over, but every other access will raise an :exc:`jinja2.exceptions.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
-
-    @internalcode
-    def _fail_with_undefined_error(self, *args, **kwargs):
-        """Regular callback function for undefined objects that raises an
-        `jinja2.exceptions.UndefinedError` on call.
-        """
-        if self._undefined_hint is None:
-            if self._undefined_obj is missing:
-                hint = '%r is undefined' % self._undefined_name
-            elif not isinstance(self._undefined_name, string_types):
-                hint = '%s has no element %r' % (
-                    object_type_repr(self._undefined_obj),
-                    self._undefined_name
-                )
-            else:
-                hint = '%r has no attribute %r' % (
-                    object_type_repr(self._undefined_obj),
-                    self._undefined_name
-                )
-        else:
-            hint = self._undefined_hint
-        raise self._undefined_exception(hint)
-
-    @internalcode
-    def __getattr__(self, name):
-        if name[:2] == '__':
-            raise AttributeError(name)
-        return self._fail_with_undefined_error()
-
-    __add__ = __radd__ = __mul__ = __rmul__ = __div__ = __rdiv__ = \
-        __truediv__ = __rtruediv__ = __floordiv__ = __rfloordiv__ = \
-        __mod__ = __rmod__ = __pos__ = __neg__ = __call__ = \
-        __getitem__ = __lt__ = __le__ = __gt__ = __ge__ = __int__ = \
-        __float__ = __complex__ = __pow__ = __rpow__ = __sub__ = \
-        __rsub__ = _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 u''
-
-    def __len__(self):
-        return 0
-
-    def __iter__(self):
-        if 0:
-            yield None
-
-    def __nonzero__(self):
-        return False
-    __bool__ = __nonzero__
-
-    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):
-        if undef._undefined_hint is None:
-            if undef._undefined_obj is missing:
-                hint = '%s is undefined' % undef._undefined_name
-            elif not isinstance(undef._undefined_name, string_types):
-                hint = '%s has no element %s' % (
-                    object_type_repr(undef._undefined_obj),
-                    undef._undefined_name)
-            else:
-                hint = '%s has no attribute %s' % (
-                    object_type_repr(undef._undefined_obj),
-                    undef._undefined_name)
-        else:
-            hint = undef._undefined_hint
-        logger.warning('Template variable warning: %s', hint)
-
-    class LoggingUndefined(base):
-
-        def _fail_with_undefined_error(self, *args, **kwargs):
-            try:
-                return base._fail_with_undefined_error(self, *args, **kwargs)
-            except self._undefined_exception as e:
-                logger.error('Template variable error: %s', str(e))
-                raise e
-
-        def __str__(self):
-            rv = base.__str__(self)
-            _log_message(self)
-            return rv
-
-        def __iter__(self):
-            rv = base.__iter__(self)
-            _log_message(self)
-            return rv
-
-        if PY2:
-            def __nonzero__(self):
-                rv = base.__nonzero__(self)
-                _log_message(self)
-                return rv
-
-            def __unicode__(self):
-                rv = base.__unicode__(self)
-                _log_message(self)
-                return rv
-        else:
-            def __bool__(self):
-                rv = base.__bool__(self)
-                _log_message(self)
-                return rv
-
-    return LoggingUndefined
-
-
-@implements_to_string
-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 is None:
-            if self._undefined_obj is missing:
-                return u'{{ %s }}' % self._undefined_name
-            return '{{ no such element: %s[%r] }}' % (
-                object_type_repr(self._undefined_obj),
-                self._undefined_name
-            )
-        return u'{{ undefined value printed: %s }}' % self._undefined_hint
-
-
-@implements_to_string
-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__ = __nonzero__ = __eq__ = \
-        __ne__ = __bool__ = __hash__ = \
-        Undefined._fail_with_undefined_error
-
-
-# remove remaining slots attributes, after the metaclass did the magic they
-# are unneeded and irritating as they contain wrong data for the subclasses.
-del Undefined.__slots__, DebugUndefined.__slots__, StrictUndefined.__slots__
diff --git a/python/jinja2/sandbox.py b/python/jinja2/sandbox.py
deleted file mode 100644
index 752e812..0000000
--- a/python/jinja2/sandbox.py
+++ /dev/null
@@ -1,486 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.sandbox
-    ~~~~~~~~~~~~~~
-
-    Adds a sandbox layer to Jinja as it was the default behavior in the old
-    Jinja 1 releases.  This sandbox is slightly different from Jinja 1 as the
-    default behavior is easier to use.
-
-    The behavior can be changed by subclassing the environment.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-import types
-import operator
-from collections import Mapping
-from jinja2.environment import Environment
-from jinja2.exceptions import SecurityError
-from jinja2._compat import string_types, PY2
-from jinja2.utils import Markup
-
-from markupsafe import EscapeFormatter
-from string import Formatter
-
-
-#: maximum number of items a range may produce
-MAX_RANGE = 100000
-
-#: attributes of function objects that are considered unsafe.
-if PY2:
-    UNSAFE_FUNCTION_ATTRIBUTES = set(['func_closure', 'func_code', 'func_dict',
-                                      'func_defaults', 'func_globals'])
-else:
-    # On versions > python 2 the special attributes on functions are gone,
-    # but they remain on methods and generators for whatever reason.
-    UNSAFE_FUNCTION_ATTRIBUTES = set()
-
-
-#: unsafe method attributes.  function attributes are unsafe for methods too
-UNSAFE_METHOD_ATTRIBUTES = set(['im_class', 'im_func', 'im_self'])
-
-#: unsafe generator attirbutes.
-UNSAFE_GENERATOR_ATTRIBUTES = set(['gi_frame', 'gi_code'])
-
-#: unsafe attributes on coroutines
-UNSAFE_COROUTINE_ATTRIBUTES = set(['cr_frame', 'cr_code'])
-
-#: unsafe attributes on async generators
-UNSAFE_ASYNC_GENERATOR_ATTRIBUTES = set(['ag_code', 'ag_frame'])
-
-import warnings
-
-# make sure we don't warn in python 2.6 about stuff we don't care about
-warnings.filterwarnings('ignore', 'the sets module', DeprecationWarning,
-                        module='jinja2.sandbox')
-
-from collections import deque
-
-_mutable_set_types = (set,)
-_mutable_mapping_types = (dict,)
-_mutable_sequence_types = (list,)
-
-
-# on python 2.x we can register the user collection types
-try:
-    from UserDict import UserDict, DictMixin
-    from UserList import UserList
-    _mutable_mapping_types += (UserDict, DictMixin)
-    _mutable_set_types += (UserList,)
-except ImportError:
-    pass
-
-# if sets is still available, register the mutable set from there as well
-try:
-    from sets import Set
-    _mutable_set_types += (Set,)
-except ImportError:
-    pass
-
-#: register Python 2.6 abstract base classes
-from collections import MutableSet, MutableMapping, MutableSequence
-_mutable_set_types += (MutableSet,)
-_mutable_mapping_types += (MutableMapping,)
-_mutable_sequence_types += (MutableSequence,)
-
-
-_mutable_spec = (
-    (_mutable_set_types, frozenset([
-        'add', 'clear', 'difference_update', 'discard', 'pop', 'remove',
-        'symmetric_difference_update', 'update'
-    ])),
-    (_mutable_mapping_types, frozenset([
-        'clear', 'pop', 'popitem', 'setdefault', 'update'
-    ])),
-    (_mutable_sequence_types, frozenset([
-        'append', 'reverse', 'insert', 'sort', 'extend', 'remove'
-    ])),
-    (deque, frozenset([
-        'append', 'appendleft', 'clear', 'extend', 'extendleft', 'pop',
-        'popleft', 'remove', 'rotate'
-    ]))
-)
-
-
-class _MagicFormatMapping(Mapping):
-    """This class implements a dummy wrapper to fix a bug in the Python
-    standard library for string formatting.
-
-    See https://bugs.python.org/issue13598 for information about why
-    this is necessary.
-    """
-
-    def __init__(self, args, kwargs):
-        self._args = args
-        self._kwargs = kwargs
-        self._last_index = 0
-
-    def __getitem__(self, key):
-        if key == '':
-            idx = self._last_index
-            self._last_index += 1
-            try:
-                return self._args[idx]
-            except LookupError:
-                pass
-            key = str(idx)
-        return self._kwargs[key]
-
-    def __iter__(self):
-        return iter(self._kwargs)
-
-    def __len__(self):
-        return len(self._kwargs)
-
-
-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, string_types):
-        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, maximum size for range is %d' %
-                            MAX_RANGE)
-    return rng
-
-
-def unsafe(f):
-    """Marks a function or method as unsafe.
-
-    ::
-
-        @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) would modify it if called.  It also supports
-    the "user"-versions of the objects (`sets.Set`, `UserDict.*` etc.) and
-    with Python 2.6 onwards the abstract base classes `MutableSet`,
-    `MutableMapping`, and `MutableSequence`.
-
-    >>> 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 (such as unicode) `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 excuted 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, string_types):
-                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('access to attribute %r of %r '
-                              'object is unsafe.' % (
-            attribute,
-            obj.__class__.__name__
-        ), 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 %d given'
-                    % (len(args) + (kwargs is not None))
-                )
-
-            kwargs = args[0]
-            args = None
-
-        kwargs = _MagicFormatMapping(args, kwargs)
-        rv = formatter.vformat(s, args, kwargs)
-        return type(s)(rv)
-
-    def call(__self, __context, __obj, *args, **kwargs):
-        """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('%r is not safely callable' % (__obj,))
-        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)
-
-
-# This really is not a public API apparenlty.
-try:
-    from _string import formatter_field_name_split
-except ImportError:
-    def formatter_field_name_split(field_name):
-        return field_name._formatter_field_name_split()
-
-
-class SandboxedFormatterMixin(object):
-
-    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/python/jinja2/tests.py b/python/jinja2/tests.py
deleted file mode 100644
index 0adc3d4..0000000
--- a/python/jinja2/tests.py
+++ /dev/null
@@ -1,175 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.tests
-    ~~~~~~~~~~~~
-
-    Jinja test functions. Used with the "is" operator.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import operator
-import re
-from collections import Mapping
-from jinja2.runtime import Undefined
-from jinja2._compat import text_type, string_types, integer_types
-import decimal
-
-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_lower(value):
-    """Return true if the variable is lowercased."""
-    return text_type(value).islower()
-
-
-def test_upper(value):
-    """Return true if the variable is uppercased."""
-    return text_type(value).isupper()
-
-
-def test_string(value):
-    """Return true if the object is a string."""
-    return isinstance(value, string_types)
-
-
-def test_mapping(value):
-    """Return true if the object is a mapping (dict etc.).
-
-    .. versionadded:: 2.6
-    """
-    return isinstance(value, Mapping)
-
-
-def test_number(value):
-    """Return true if the variable is a number."""
-    return isinstance(value, integer_types + (float, complex, decimal.Decimal))
-
-
-def test_sequence(value):
-    """Return true if the variable is a sequence. Sequences are variables
-    that are iterable.
-    """
-    try:
-        len(value)
-        value.__getitem__
-    except:
-        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,
-    '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/python/jinja2/utils.py b/python/jinja2/utils.py
deleted file mode 100644
index 502a311..0000000
--- a/python/jinja2/utils.py
+++ /dev/null
@@ -1,647 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.utils
-    ~~~~~~~~~~~~
-
-    Utility functions.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD, see LICENSE for more details.
-"""
-import re
-import json
-import errno
-from collections import deque
-from threading import Lock
-from jinja2._compat import text_type, string_types, implements_iterator, \
-     url_quote
-
-
-_word_split_re = re.compile(r'(\s+)')
-_punctuation_re = re.compile(
-    '^(?P<lead>(?:%s)*)(?P<middle>.*?)(?P<trail>(?:%s)*)$' % (
-        '|'.join(map(re.escape, ('(', '<', '&lt;'))),
-        '|'.join(map(re.escape, ('.', ',', ')', '>', '\n', '&gt;')))
-    )
-)
-_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 = u''.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 jinja2.runtime import Undefined
-    return isinstance(obj, Undefined)
-
-
-def consume(iterable):
-    """Consumes an iterable without doing anything with it."""
-    for event in iterable:
-        pass
-
-
-def clear_caches():
-    """Jinja2 keeps internal caches for environments and lexers.  These are
-    used so that Jinja2 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 jinja2.environment import _spontaneous_environments
-    from jinja2.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:
-            items = import_name.split('.')
-            module = '.'.join(items[:-1])
-            obj = items[-1]
-        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`.
-    """
-    try:
-        return open(filename, mode)
-    except IOError as e:
-        if e.errno not in (errno.ENOENT, errno.EISDIR, errno.EINVAL):
-            raise
-
-
-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'
-    # __builtin__ in 2.x, builtins in 3.x
-    if obj.__class__.__module__ in ('__builtin__', 'builtins'):
-        name = obj.__class__.__name__
-    else:
-        name = obj.__class__.__module__ + '.' + obj.__class__.__name__
-    return '%s object' % name
-
-
-def pformat(obj, verbose=False):
-    """Prettyprint an object.  Either use the `pretty` library or the
-    builtin `pprint`.
-    """
-    try:
-        from pretty import pretty
-        return pretty(obj, verbose=verbose)
-    except ImportError:
-        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.
-    """
-    trim_url = lambda x, limit=trim_url_limit: limit is not None \
-                         and (x[:limit] + (len(x) >=limit and '...'
-                         or '')) or x
-    words = _word_split_re.split(text_type(escape(text)))
-    rel_attr = rel and ' rel="%s"' % text_type(escape(rel)) or ''
-    target_attr = target and ' target="%s"' % escape(target) or ''
-
-    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 = '<a href="http://%s"%s%s>%s</a>' % (middle,
-                    rel_attr, target_attr, trim_url(middle))
-            if middle.startswith('http://') or \
-               middle.startswith('https://'):
-                middle = '<a href="%s"%s%s>%s</a>' % (middle,
-                    rel_attr, target_attr, trim_url(middle))
-            if '@' in middle and not middle.startswith('www.') and \
-               not ':' in middle and _simple_email_re.match(middle):
-                middle = '<a href="mailto:%s">%s</a>' % (middle, middle)
-            if lead + middle + trail != word:
-                words[i] = lead + middle + trail
-    return u''.join(words)
-
-
-def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
-    """Generate some lorem ipsum for the template."""
-    from jinja2.constants import LOREM_IPSUM_WORDS
-    from random import choice, randrange
-    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 = u' '.join(p)
-        if p.endswith(','):
-            p = p[:-1] + '.'
-        elif not p.endswith('.'):
-            p += '.'
-        result.append(p)
-
-    if not html:
-        return u'\n\n'.join(result)
-    return Markup(u'\n'.join(u'<p>%s</p>' % escape(x) for x in result))
-
-
-def unicode_urlencode(obj, charset='utf-8', for_qs=False):
-    """URL escapes a single bytestring or unicode string with the
-    given charset if applicable to URL safe quoting under all rules
-    that need to be considered under all supported Python versions.
-
-    If non strings are provided they are converted to their unicode
-    representation first.
-    """
-    if not isinstance(obj, string_types):
-        obj = text_type(obj)
-    if isinstance(obj, text_type):
-        obj = obj.encode(charset)
-    safe = not for_qs and b'/' or b''
-    rv = text_type(url_quote(obj, safe))
-    if for_qs:
-        rv = rv.replace('%20', '+')
-    return rv
-
-
-class LRUCache(object):
-    """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 = deque(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.
-        """
-        self._wlock.acquire()
-        try:
-            try:
-                return self[key]
-            except KeyError:
-                self[key] = default
-                return default
-        finally:
-            self._wlock.release()
-
-    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 '<%s %r>' % (
-            self.__class__.__name__,
-            self._mapping
-        )
-
-    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:
-                # __getitem__ is not locked, it might happen
-                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 iteritems(self):
-        """Iterate over all items."""
-        return iter(self.items())
-
-    def values(self):
-        """Return a list of all values."""
-        return [x[1] for x in self.items()]
-
-    def itervalue(self):
-        """Iterate over all values."""
-        return iter(self.values())
-
-    def keys(self):
-        """Return a list of all keys ordered by most recent usage."""
-        return list(self)
-
-    def iterkeys(self):
-        """Iterate over all keys in the cache dict, ordered by
-        the most recent usage.
-        """
-        return reversed(tuple(self._queue))
-
-    __iter__ = iterkeys
-
-    def __reversed__(self):
-        """Iterate over the values in the cache dict, oldest items
-        coming first.
-        """
-        return iter(tuple(self._queue))
-
-    __copy__ = copy
-
-
-# register the LRU cache as mutable mapping if possible
-try:
-    from collections import MutableMapping
-    MutableMapping.register(LRUCache)
-except ImportError:
-    pass
-
-
-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('.' + x.lstrip('.').lower()
-                             for x in enabled_extensions)
-    disabled_patterns = tuple('.' + 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(u'<', u'\\u003c') \
-        .replace(u'>', u'\\u003e') \
-        .replace(u'&', u'\\u0026') \
-        .replace(u"'", u'\\u0027')
-    return Markup(rv)
-
-
-@implements_iterator
-class Cycler(object):
-    """A cycle helper for templates."""
-
-    def __init__(self, *items):
-        if not items:
-            raise RuntimeError('at least one item has to be provided')
-        self.items = items
-        self.reset()
-
-    def reset(self):
-        """Resets the cycle."""
-        self.pos = 0
-
-    @property
-    def current(self):
-        """Returns the current item."""
-        return self.items[self.pos]
-
-    def next(self):
-        """Goes one item ahead and returns it."""
-        rv = self.current
-        self.pos = (self.pos + 1) % len(self.items)
-        return rv
-
-    __next__ = next
-
-
-class Joiner(object):
-    """A joining helper for templates."""
-
-    def __init__(self, sep=u', '):
-        self.sep = sep
-        self.used = False
-
-    def __call__(self):
-        if not self.used:
-            self.used = True
-            return u''
-        return self.sep
-
-
-class Namespace(object):
-    """A namespace object that can hold arbitrary attributes.  It may be
-    initialized from a dictionary or with keyword argments."""
-
-    def __init__(*args, **kwargs):
-        self, args = args[0], args[1:]
-        self.__attrs = dict(*args, **kwargs)
-
-    def __getattribute__(self, name):
-        if name == '_Namespace__attrs':
-            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 '<Namespace %r>' % self.__attrs
-
-
-# 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
-
-
-# Imported here because that's where it was in the past
-from markupsafe import Markup, escape, soft_unicode
diff --git a/python/jinja2/visitor.py b/python/jinja2/visitor.py
deleted file mode 100644
index ba526df..0000000
--- a/python/jinja2/visitor.py
+++ /dev/null
@@ -1,87 +0,0 @@
-# -*- coding: utf-8 -*-
-"""
-    jinja2.visitor
-    ~~~~~~~~~~~~~~
-
-    This module implements a visitor for the nodes.
-
-    :copyright: (c) 2017 by the Jinja Team.
-    :license: BSD.
-"""
-from jinja2.nodes import Node
-
-
-class NodeVisitor(object):
-    """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.
-        """
-        method = 'visit_' + node.__class__.__name__
-        return getattr(self, method, 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