text: """
  Internationalization support.
  """
  import re
  from contextlib import ContextDecorator
  
  from djmodels.utils.functional import lazy
  
  __all__ = [
      'activate', 'deactivate', 'override', 'deactivate_all',
      'get_language', 'get_language_from_request',
      'get_language_info', 'get_language_bidi',
      'check_for_language', 'to_language', 'to_locale', 'templatize',
      'gettext', 'gettext_lazy', 'gettext_noop',
      'ugettext', 'ugettext_lazy', 'ugettext_noop',
      'ngettext', 'ngettext_lazy',
      'ungettext', 'ungettext_lazy',
      'pgettext', 'pgettext_lazy',
      'npgettext', 'npgettext_lazy',
      'LANGUAGE_SESSION_KEY',
  ]
  
  LANGUAGE_SESSION_KEY = '_language'
  
  
  class TranslatorCommentWarning(SyntaxWarning):
      pass
  
  
  # Here be dragons, so a short explanation of the logic won't hurt:
  # We are trying to solve two problems: (1) access settings, in particular
  # settings.USE_I18N, as late as possible, so that modules can be imported
  # without having to first configure Django, and (2) if some other code creates
  # a reference to one of these functions, don't break that reference when we
  # replace the functions with their real counterparts (once we do access the
  # settings).
  
  class Trans:
      """
      The purpose of this class is to store the actual translation function upon
      receiving the first call to that function. After this is done, changes to
      USE_I18N will have no effect to which function is served upon request. If
      your tests rely on changing USE_I18N, you can delete all the functions
      from _trans.__dict__.
  
      Note that storing the function with setattr will have a noticeable
      performance effect, as access to the function goes the normal path,
      instead of using __getattr__.
      """
  
      def __getattr__(self, real_name):
          from djmodels.conf import settings
          if settings.USE_I18N:
              from djmodels.utils.translation import trans_real as trans
          else:
              from djmodels.utils.translation import trans_null as trans
          setattr(self, real_name, getattr(trans, real_name))
          return getattr(trans, real_name)
  
  
  _trans = Trans()
  
  # The Trans class is no more needed, so remove it from the namespace.
  del Trans
  
  
  def gettext_noop(message):
      return _trans.gettext_noop(message)
  
  
  ugettext_noop = gettext_noop
  
  
  def gettext(message):
      return _trans.gettext(message)
  
  
  # An alias since Django 2.0
  ugettext = gettext
  
  
  def ngettext(singular, plural, number):
      return _trans.ngettext(singular, plural, number)
  
  
  # An alias since Django 2.0
  ungettext = ngettext
  
  
  def pgettext(context, message):
      return _trans.pgettext(context, message)
  
  
  def npgettext(context, singular, plural, number):
      return _trans.npgettext(context, singular, plural, number)
  
  
  gettext_lazy = ugettext_lazy = lazy(gettext, str)
  pgettext_lazy = lazy(pgettext, str)
  
  
  def lazy_number(func, resultclass, number=None, **kwargs):
      if isinstance(number, int):
          kwargs['number'] = number
          proxy = lazy(func, resultclass)(**kwargs)
      else:
          original_kwargs = kwargs.copy()
  
          class NumberAwareString(resultclass):
              def __bool__(self):
                  return bool(kwargs['singular'])
  
              def __mod__(self, rhs):
                  if isinstance(rhs, dict) and number:
                      try:
                          number_value = rhs[number]
                      except KeyError:
                          raise KeyError(
                              "Your dictionary lacks key '%s\'. Please provide "
                              "it, because it is required to determine whether "
                              "string is singular or plural." % number
                          )
                  else:
                      number_value = rhs
                  kwargs['number'] = number_value
                  translated = func(**kwargs)
                  try:
                      translated = translated % rhs
                  except TypeError:
                      # String doesn't contain a placeholder for the number.
                      pass
                  return translated
  
          proxy = lazy(lambda **kwargs: NumberAwareString(), NumberAwareString)(**kwargs)
          proxy.__reduce__ = lambda: (_lazy_number_unpickle, (func, resultclass, number, original_kwargs))
      return proxy
  
  
  def _lazy_number_unpickle(func, resultclass, number, kwargs):
      return lazy_number(func, resultclass, number=number, **kwargs)
  
  
  def ngettext_lazy(singular, plural, number=None):
      return lazy_number(ngettext, str, singular=singular, plural=plural, number=number)
  
  
  # An alias since Django 2.0
  ungettext_lazy = ngettext_lazy
  
  
  def npgettext_lazy(context, singular, plural, number=None):
      return lazy_number(npgettext, str, context=context, singular=singular, plural=plural, number=number)
  
  
  def activate(language):
      return _trans.activate(language)
  
  
  def deactivate():
      return _trans.deactivate()
  
  
  class override(ContextDecorator):
      def __init__(self, language, deactivate=False):
          self.language = language
          self.deactivate = deactivate
  
      def __enter__(self):
          self.old_language = get_language()
          if self.language is not None:
              activate(self.language)
          else:
              deactivate_all()
  
      def __exit__(self, exc_type, exc_value, traceback):
          if self.old_language is None:
              deactivate_all()
          elif self.deactivate:
              deactivate()
          else:
              activate(self.old_language)
  
  
  def get_language():
      return _trans.get_language()
  
  
  def get_language_bidi():
      return _trans.get_language_bidi()
  
  
  def check_for_language(lang_code):
      return _trans.check_for_language(lang_code)
  
  
  def to_language(locale):
      """Turn a locale name (en_US) into a language name (en-us)."""
      p = locale.find('_')
      if p >= 0:
          return locale[:p].lower() + '-' + locale[p + 1:].lower()
      else:
          return locale.lower()
  
  
  def to_locale(language):
      """Turn a language name (en-us) into a locale name (en_US)."""
      language = language.lower()
      parts = language.split('-')
      try:
          country = parts[1]
      except IndexError:
          return language
      # A language with > 2 characters after the dash only has its first
      # character after the dash capitalized; e.g. sr-latn becomes sr_Latn.
      # A language with 2 characters after the dash has both characters
      # capitalized; e.g. en-us becomes en_US.
      parts[1] = country.title() if len(country) > 2 else country.upper()
      return parts[0] + '_' + '-'.join(parts[1:])
  
  
  def get_language_from_request(request, check_path=False):
      return _trans.get_language_from_request(request, check_path)
  
  
  def get_language_from_path(path):
      return _trans.get_language_from_path(path)
  
  
  def get_supported_language_variant(lang_code, *, strict=False):
      return _trans.get_supported_language_variant(lang_code, strict)
  
  
  def templatize(src, **kwargs):
      from .template import templatize
      return templatize(src, **kwargs)
  
  
  def deactivate_all():
      return _trans.deactivate_all()
  
  
  def get_language_info(lang_code):
      from djmodels.conf.locale import LANG_INFO
      try:
          lang_info = LANG_INFO[lang_code]
          if 'fallback' in lang_info and 'name' not in lang_info:
              info = get_language_info(lang_info['fallback'][0])
          else:
              info = lang_info
      except KeyError:
          if '-' not in lang_code:
              raise KeyError("Unknown language code %s." % lang_code)
          generic_lang_code = lang_code.split('-')[0]
          try:
              info = LANG_INFO[generic_lang_code]
          except KeyError:
              raise KeyError("Unknown language code %s and %s." % (lang_code, generic_lang_code))
  
      if info:
          info['name_translated'] = gettext_lazy(info['name'])
      return info
  
  
  trim_whitespace_re = re.compile(r'\s*\n\s*')
  
  
  def trim_whitespace(s):
      return trim_whitespace_re.sub(' ', s.strip())
  