text: import json
  import os
  import re
  from collections import abc
  from collections import deque
  from random import choice
  from random import randrange
  from threading import Lock
  from urllib.parse import quote_from_bytes
  
  from markupsafe import escape
  from markupsafe import Markup
  
  _word_split_re = re.compile(r"(\s+)")
  _lead_pattern = "|".join(map(re.escape, ("(", "<", "&lt;")))
  _trail_pattern = "|".join(map(re.escape, (".", ",", ")", ">", "\n", "&gt;")))
  _punctuation_re = re.compile(
      fr"^(?P<lead>(?:{_lead_pattern})*)(?P<middle>.*?)(?P<trail>(?:{_trail_pattern})*)$"
  )
  _simple_email_re = re.compile(r"^\S+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9._-]+$")
  _striptags_re = re.compile(r"(<!--.*?-->|<[^>]*>)")
  _entity_re = re.compile(r"&([^;]+);")
  _letters = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ"
  _digits = "0123456789"
  
  # special singleton representing missing values for the runtime
  missing = type("MissingType", (), {"__repr__": lambda x: "missing"})()
  
  # internal code
  internal_code = set()
  
  concat = "".join
  
  _slash_escape = "\\/" not in json.dumps("/")
  
  
  def contextfunction(f):
      """This decorator can be used to mark a function or method context callable.
      A context callable is passed the active :class:`Context` as first argument when
      called from the template.  This is useful if a function wants to get access
      to the context or functions provided on the context object.  For example
      a function that returns a sorted list of template variables the current
      template exports could look like this::
  
          @contextfunction
          def get_exported_names(context):
              return sorted(context.exported_vars)
      """
      f.contextfunction = True
      return f
  
  
  def evalcontextfunction(f):
      """This decorator can be used to mark a function or method as an eval
      context callable.  This is similar to the :func:`contextfunction`
      but instead of passing the context, an evaluation context object is
      passed.  For more information about the eval context, see
      :ref:`eval-context`.
  
      .. versionadded:: 2.4
      """
      f.evalcontextfunction = True
      return f
  
  
  def environmentfunction(f):
      """This decorator can be used to mark a function or method as environment
      callable.  This decorator works exactly like the :func:`contextfunction`
      decorator just that the first argument is the active :class:`Environment`
      and not context.
      """
      f.environmentfunction = True
      return f
  
  
  def internalcode(f):
      """Marks the function as internally used"""
      internal_code.add(f.__code__)
      return f
  
  
  def is_undefined(obj):
      """Check if the object passed is undefined.  This does nothing more than
      performing an instance check against :class:`Undefined` but looks nicer.
      This can be used for custom filters or tests that want to react to
      undefined variables.  For example a custom default filter can look like
      this::
  
          def default(var, default=''):
              if is_undefined(var):
                  return default
              return var
      """
      from .runtime import Undefined
  
      return isinstance(obj, Undefined)
  
  
  def consume(iterable):
      """Consumes an iterable without doing anything with it."""
      for _ in iterable:
          pass
  
  
  def clear_caches():
      """Jinja keeps internal caches for environments and lexers.  These are
      used so that Jinja doesn't have to recreate environments and lexers all
      the time.  Normally you don't have to care about that but if you are
      measuring memory consumption you may want to clean the caches.
      """
      from .environment import _spontaneous_environments
      from .lexer import _lexer_cache
  
      _spontaneous_environments.clear()
      _lexer_cache.clear()
  
  
  def import_string(import_name, silent=False):
      """Imports an object based on a string.  This is useful if you want to
      use import paths as endpoints or something similar.  An import path can
      be specified either in dotted notation (``xml.sax.saxutils.escape``)
      or with a colon as object delimiter (``xml.sax.saxutils:escape``).
  
      If the `silent` is True the return value will be `None` if the import
      fails.
  
      :return: imported object
      """
      try:
          if ":" in import_name:
              module, obj = import_name.split(":", 1)
          elif "." in import_name:
              module, _, obj = import_name.rpartition(".")
          else:
              return __import__(import_name)
          return getattr(__import__(module, None, None, [obj]), obj)
      except (ImportError, AttributeError):
          if not silent:
              raise
  
  
  def open_if_exists(filename, mode="rb"):
      """Returns a file descriptor for the filename if that file exists,
      otherwise ``None``.
      """
      if not os.path.isfile(filename):
          return None
  
      return open(filename, mode)
  
  
  def object_type_repr(obj):
      """Returns the name of the object's type.  For some recognized
      singletons the name of the object is returned instead. (For
      example for `None` and `Ellipsis`).
      """
      if obj is None:
          return "None"
      elif obj is Ellipsis:
          return "Ellipsis"
      # __builtin__ in 2.x, builtins in 3.x
      if obj.__class__.__module__ in ("__builtin__", "builtins"):
          name = obj.__class__.__name__
      else:
          name = f"{obj.__class__.__module__}.{obj.__class__.__name__}"
      return f"{name} object"
  
  
  def pformat(obj):
      """Format an object using :func:`pprint.pformat`.
      """
      from pprint import pformat
  
      return pformat(obj)
  
  
  def urlize(text, trim_url_limit=None, rel=None, target=None):
      """Converts any URLs in text into clickable links. Works on http://,
      https:// and www. links. Links can have trailing punctuation (periods,
      commas, close-parens) and leading punctuation (opening parens) and
      it'll still do the right thing.
  
      If trim_url_limit is not None, the URLs in link text will be limited
      to trim_url_limit characters.
  
      If nofollow is True, the URLs in link text will get a rel="nofollow"
      attribute.
  
      If target is not None, a target attribute will be added to the link.
      """
  
      def trim_url(x, limit=trim_url_limit):
          if limit is not None:
              return x[:limit] + ("..." if len(x) >= limit else "")
  
          return x
  
      words = _word_split_re.split(str(escape(text)))
      rel_attr = f' rel="{escape(rel)}"' if rel else ""
      target_attr = f' target="{escape(target)}"' if target else ""
  
      for i, word in enumerate(words):
          match = _punctuation_re.match(word)
          if match:
              lead, middle, trail = match.groups()
              if middle.startswith("www.") or (
                  "@" not in middle
                  and not middle.startswith("http://")
                  and not middle.startswith("https://")
                  and len(middle) > 0
                  and middle[0] in _letters + _digits
                  and (
                      middle.endswith(".org")
                      or middle.endswith(".net")
                      or middle.endswith(".com")
                  )
              ):
                  middle = (
                      f'<a href="http://{middle}"{rel_attr}{target_attr}>'
                      f"{trim_url(middle)}</a>"
                  )
              if middle.startswith("http://") or middle.startswith("https://"):
                  middle = (
                      f'<a href="{middle}"{rel_attr}{target_attr}>{trim_url(middle)}</a>'
                  )
              if (
                  "@" in middle
                  and not middle.startswith("www.")
                  and ":" not in middle
                  and _simple_email_re.match(middle)
              ):
                  middle = f'<a href="mailto:{middle}">{middle}</a>'
              if lead + middle + trail != word:
                  words[i] = lead + middle + trail
      return "".join(words)
  
  
  def generate_lorem_ipsum(n=5, html=True, min=20, max=100):
      """Generate some lorem ipsum for the template."""
      from .constants import LOREM_IPSUM_WORDS
  
      words = LOREM_IPSUM_WORDS.split()
      result = []
  
      for _ in range(n):
          next_capitalized = True
          last_comma = last_fullstop = 0
          word = None
          last = None
          p = []
  
          # each paragraph contains out of 20 to 100 words.
          for idx, _ in enumerate(range(randrange(min, max))):
              while True:
                  word = choice(words)
                  if word != last:
                      last = word
                      break
              if next_capitalized:
                  word = word.capitalize()
                  next_capitalized = False
              # add commas
              if idx - randrange(3, 8) > last_comma:
                  last_comma = idx
                  last_fullstop += 2
                  word += ","
              # add end of sentences
              if idx - randrange(10, 20) > last_fullstop:
                  last_comma = last_fullstop = idx
                  word += "."
                  next_capitalized = True
              p.append(word)
  
          # ensure that the paragraph ends with a dot.
          p = " ".join(p)
          if p.endswith(","):
              p = p[:-1] + "."
          elif not p.endswith("."):
              p += "."
          result.append(p)
  
      if not html:
          return "\n\n".join(result)
      return Markup("\n".join(f"<p>{escape(x)}</p>" for x in result))
  
  
  def url_quote(obj, charset="utf-8", for_qs=False):
      """Quote a string for use in a URL using the given charset.
  
      This function is misnamed, it is a wrapper around
      :func:`urllib.parse.quote`.
  
      :param obj: String or bytes to quote. Other types are converted to
          string then encoded to bytes using the given charset.
      :param charset: Encode text to bytes using this charset.
      :param for_qs: Quote "/" and use "+" for spaces.
      """
      if not isinstance(obj, bytes):
          if not isinstance(obj, str):
              obj = str(obj)
  
          obj = obj.encode(charset)
  
      safe = b"" if for_qs else b"/"
      rv = quote_from_bytes(obj, safe)
  
      if for_qs:
          rv = rv.replace("%20", "+")
  
      return rv
  
  
  def unicode_urlencode(obj, charset="utf-8", for_qs=False):
      import warnings
  
      warnings.warn(
          "'unicode_urlencode' has been renamed to 'url_quote'. The old"
          " name will be removed in version 3.1.",
          DeprecationWarning,
          stacklevel=2,
      )
      return url_quote(obj, charset=charset, for_qs=for_qs)
  
  
  @abc.MutableMapping.register
  class LRUCache:
      """A simple LRU Cache implementation."""
  
      # this is fast for small capacities (something below 1000) but doesn't
      # scale.  But as long as it's only used as storage for templates this
      # won't do any harm.
  
      def __init__(self, capacity):
          self.capacity = capacity
          self._mapping = {}
          self._queue = deque()
          self._postinit()
  
      def _postinit(self):
          # alias all queue methods for faster lookup
          self._popleft = self._queue.popleft
          self._pop = self._queue.pop
          self._remove = self._queue.remove
          self._wlock = Lock()
          self._append = self._queue.append
  
      def __getstate__(self):
          return {
              "capacity": self.capacity,
              "_mapping": self._mapping,
              "_queue": self._queue,
          }
  
      def __setstate__(self, d):
          self.__dict__.update(d)
          self._postinit()
  
      def __getnewargs__(self):
          return (self.capacity,)
  
      def copy(self):
          """Return a shallow copy of the instance."""
          rv = self.__class__(self.capacity)
          rv._mapping.update(self._mapping)
          rv._queue.extend(self._queue)
          return rv
  
      def get(self, key, default=None):
          """Return an item from the cache dict or `default`"""
          try:
              return self[key]
          except KeyError:
              return default
  
      def setdefault(self, key, default=None):
          """Set `default` if the key is not in the cache otherwise
          leave unchanged. Return the value of this key.
          """
          try:
              return self[key]
          except KeyError:
              self[key] = default
              return default
  
      def clear(self):
          """Clear the cache."""
          self._wlock.acquire()
          try:
              self._mapping.clear()
              self._queue.clear()
          finally:
              self._wlock.release()
  
      def __contains__(self, key):
          """Check if a key exists in this cache."""
          return key in self._mapping
  
      def __len__(self):
          """Return the current size of the cache."""
          return len(self._mapping)
  
      def __repr__(self):
          return f"<{self.__class__.__name__} {self._mapping!r}>"
  
      def __getitem__(self, key):
          """Get an item from the cache. Moves the item up so that it has the
          highest priority then.
  
          Raise a `KeyError` if it does not exist.
          """
          self._wlock.acquire()
          try:
              rv = self._mapping[key]
              if self._queue[-1] != key:
                  try:
                      self._remove(key)
                  except ValueError:
                      # if something removed the key from the container
                      # when we read, ignore the ValueError that we would
                      # get otherwise.
                      pass
                  self._append(key)
              return rv
          finally:
              self._wlock.release()
  
      def __setitem__(self, key, value):
          """Sets the value for an item. Moves the item up so that it
          has the highest priority then.
          """
          self._wlock.acquire()
          try:
              if key in self._mapping:
                  self._remove(key)
              elif len(self._mapping) == self.capacity:
                  del self._mapping[self._popleft()]
              self._append(key)
              self._mapping[key] = value
          finally:
              self._wlock.release()
  
      def __delitem__(self, key):
          """Remove an item from the cache dict.
          Raise a `KeyError` if it does not exist.
          """
          self._wlock.acquire()
          try:
              del self._mapping[key]
              try:
                  self._remove(key)
              except ValueError:
                  pass
          finally:
              self._wlock.release()
  
      def items(self):
          """Return a list of items."""
          result = [(key, self._mapping[key]) for key in list(self._queue)]
          result.reverse()
          return result
  
      def values(self):
          """Return a list of all values."""
          return [x[1] for x in self.items()]
  
      def keys(self):
          """Return a list of all keys ordered by most recent usage."""
          return list(self)
  
      def __iter__(self):
          return reversed(tuple(self._queue))
  
      def __reversed__(self):
          """Iterate over the keys in the cache dict, oldest items
          coming first.
          """
          return iter(tuple(self._queue))
  
      __copy__ = copy
  
  
  def select_autoescape(
      enabled_extensions=("html", "htm", "xml"),
      disabled_extensions=(),
      default_for_string=True,
      default=False,
  ):
      """Intelligently sets the initial value of autoescaping based on the
      filename of the template.  This is the recommended way to configure
      autoescaping if you do not want to write a custom function yourself.
  
      If you want to enable it for all templates created from strings or
      for all templates with `.html` and `.xml` extensions::
  
          from jinja2 import Environment, select_autoescape
          env = Environment(autoescape=select_autoescape(
              enabled_extensions=('html', 'xml'),
              default_for_string=True,
          ))
  
      Example configuration to turn it on at all times except if the template
      ends with `.txt`::
  
          from jinja2 import Environment, select_autoescape
          env = Environment(autoescape=select_autoescape(
              disabled_extensions=('txt',),
              default_for_string=True,
              default=True,
          ))
  
      The `enabled_extensions` is an iterable of all the extensions that
      autoescaping should be enabled for.  Likewise `disabled_extensions` is
      a list of all templates it should be disabled for.  If a template is
      loaded from a string then the default from `default_for_string` is used.
      If nothing matches then the initial value of autoescaping is set to the
      value of `default`.
  
      For security reasons this function operates case insensitive.
  
      .. versionadded:: 2.9
      """
      enabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in enabled_extensions)
      disabled_patterns = tuple(f".{x.lstrip('.').lower()}" for x in disabled_extensions)
  
      def autoescape(template_name):
          if template_name is None:
              return default_for_string
          template_name = template_name.lower()
          if template_name.endswith(enabled_patterns):
              return True
          if template_name.endswith(disabled_patterns):
              return False
          return default
  
      return autoescape
  
  
  def htmlsafe_json_dumps(obj, dumper=None, **kwargs):
      """Works exactly like :func:`dumps` but is safe for use in ``<script>``
      tags.  It accepts the same arguments and returns a JSON string.  Note that
      this is available in templates through the ``|tojson`` filter which will
      also mark the result as safe.  Due to how this function escapes certain
      characters this is safe even if used outside of ``<script>`` tags.
  
      The following characters are escaped in strings:
  
      -   ``<``
      -   ``>``
      -   ``&``
      -   ``'``
  
      This makes it safe to embed such strings in any place in HTML with the
      notable exception of double quoted attributes.  In that case single
      quote your attributes or HTML escape it in addition.
      """
      if dumper is None:
          dumper = json.dumps
      rv = (
          dumper(obj, **kwargs)
          .replace("<", "\\u003c")
          .replace(">", "\\u003e")
          .replace("&", "\\u0026")
          .replace("'", "\\u0027")
      )
      return Markup(rv)
  
  
  class Cycler:
      """Cycle through values by yield them one at a time, then restarting
      once the end is reached. Available as ``cycler`` in templates.
  
      Similar to ``loop.cycle``, but can be used outside loops or across
      multiple loops. For example, render a list of folders and files in a
      list, alternating giving them "odd" and "even" classes.
  
      .. code-block:: html+jinja
  
          {% set row_class = cycler("odd", "even") %}
          <ul class="browser">
          {% for folder in folders %}
            <li class="folder {{ row_class.next() }}">{{ folder }}
          {% endfor %}
          {% for file in files %}
            <li class="file {{ row_class.next() }}">{{ file }}
          {% endfor %}
          </ul>
  
      :param items: Each positional argument will be yielded in the order
          given for each cycle.
  
      .. versionadded:: 2.1
      """
  
      def __init__(self, *items):
          if not items:
              raise RuntimeError("at least one item has to be provided")
          self.items = items
          self.pos = 0
  
      def reset(self):
          """Resets the current item to the first item."""
          self.pos = 0
  
      @property
      def current(self):
          """Return the current item. Equivalent to the item that will be
          returned next time :meth:`next` is called.
          """
          return self.items[self.pos]
  
      def next(self):
          """Return the current item, then advance :attr:`current` to the
          next item.
          """
          rv = self.current
          self.pos = (self.pos + 1) % len(self.items)
          return rv
  
      __next__ = next
  
  
  class Joiner:
      """A joining helper for templates."""
  
      def __init__(self, sep=", "):
          self.sep = sep
          self.used = False
  
      def __call__(self):
          if not self.used:
              self.used = True
              return ""
          return self.sep
  
  
  class Namespace:
      """A namespace object that can hold arbitrary attributes.  It may be
      initialized from a dictionary or with keyword arguments."""
  
      def __init__(*args, **kwargs):  # noqa: B902
          self, args = args[0], args[1:]
          self.__attrs = dict(*args, **kwargs)
  
      def __getattribute__(self, name):
          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 f"<Namespace {self.__attrs!r}>"
  
  
  # does this python version support async for in and async generators?
  try:
      exec("async def _():\n async for _ in ():\n  yield _")
      have_async_gen = True
  except SyntaxError:
      have_async_gen = False
  