text: import re
  import typing as t
  import warnings
  
  from .user_agent import UserAgent as _BaseUserAgent
  
  if t.TYPE_CHECKING:
      from wsgiref.types import WSGIEnvironment
  
  
  class _UserAgentParser:
      platform_rules: t.ClassVar[t.Iterable[t.Tuple[str, str]]] = (
          (" cros ", "chromeos"),
          ("iphone|ios", "iphone"),
          ("ipad", "ipad"),
          (r"darwin\b|mac\b|os\s*x", "macos"),
          ("win", "windows"),
          (r"android", "android"),
          ("netbsd", "netbsd"),
          ("openbsd", "openbsd"),
          ("freebsd", "freebsd"),
          ("dragonfly", "dragonflybsd"),
          ("(sun|i86)os", "solaris"),
          (r"x11\b|lin(\b|ux)?", "linux"),
          (r"nintendo\s+wii", "wii"),
          ("irix", "irix"),
          ("hp-?ux", "hpux"),
          ("aix", "aix"),
          ("sco|unix_sv", "sco"),
          ("bsd", "bsd"),
          ("amiga", "amiga"),
          ("blackberry|playbook", "blackberry"),
          ("symbian", "symbian"),
      )
      browser_rules: t.ClassVar[t.Iterable[t.Tuple[str, str]]] = (
          ("googlebot", "google"),
          ("msnbot", "msn"),
          ("yahoo", "yahoo"),
          ("ask jeeves", "ask"),
          (r"aol|america\s+online\s+browser", "aol"),
          (r"opera|opr", "opera"),
          ("edge|edg", "edge"),
          ("chrome|crios", "chrome"),
          ("seamonkey", "seamonkey"),
          ("firefox|firebird|phoenix|iceweasel", "firefox"),
          ("galeon", "galeon"),
          ("safari|version", "safari"),
          ("webkit", "webkit"),
          ("camino", "camino"),
          ("konqueror", "konqueror"),
          ("k-meleon", "kmeleon"),
          ("netscape", "netscape"),
          (r"msie|microsoft\s+internet\s+explorer|trident/.+? rv:", "msie"),
          ("lynx", "lynx"),
          ("links", "links"),
          ("Baiduspider", "baidu"),
          ("bingbot", "bing"),
          ("mozilla", "mozilla"),
      )
  
      _browser_version_re = r"(?:{pattern})[/\sa-z(]*(\d+[.\da-z]+)?"
      _language_re = re.compile(
          r"(?:;\s*|\s+)(\b\w{2}\b(?:-\b\w{2}\b)?)\s*;|"
          r"(?:\(|\[|;)\s*(\b\w{2}\b(?:-\b\w{2}\b)?)\s*(?:\]|\)|;)"
      )
  
      def __init__(self) -> None:
          self.platforms = [(b, re.compile(a, re.I)) for a, b in self.platform_rules]
          self.browsers = [
              (b, re.compile(self._browser_version_re.format(pattern=a), re.I))
              for a, b in self.browser_rules
          ]
  
      def __call__(
          self, user_agent: str
      ) -> t.Tuple[t.Optional[str], t.Optional[str], t.Optional[str], t.Optional[str]]:
          platform: t.Optional[str]
          browser: t.Optional[str]
          version: t.Optional[str]
          language: t.Optional[str]
  
          for platform, regex in self.platforms:  # noqa: B007
              match = regex.search(user_agent)
              if match is not None:
                  break
          else:
              platform = None
  
          # Except for Trident, all browser key words come after the last ')'
          last_closing_paren = 0
          if (
              not re.compile(r"trident/.+? rv:", re.I).search(user_agent)
              and ")" in user_agent
              and user_agent[-1] != ")"
          ):
              last_closing_paren = user_agent.rindex(")")
  
          for browser, regex in self.browsers:  # noqa: B007
              match = regex.search(user_agent[last_closing_paren:])
              if match is not None:
                  version = match.group(1)
                  break
          else:
              browser = version = None
          match = self._language_re.search(user_agent)
          if match is not None:
              language = match.group(1) or match.group(2)
          else:
              language = None
          return platform, browser, version, language
  
  
  # It wasn't public, but users might have imported it anyway, show a
  # warning if a user created an instance.
  class UserAgentParser(_UserAgentParser):
      """A simple user agent parser.  Used by the `UserAgent`.
  
      .. deprecated:: 2.0
          Will be removed in Werkzeug 2.1. Use a dedicated parser library
          instead.
      """
  
      def __init__(self):
          warnings.warn(
              "'UserAgentParser' is deprecated and will be removed in"
              " Werkzeug 2.1. Use a dedicated parser library instead.",
              DeprecationWarning,
              stacklevel=2,
          )
          super().__init__()
  
  
  class _deprecated_property(property):
      def __init__(self, fget):
          super().__init__(fget)
          self.message = (
              "The built-in user agent parser is deprecated and will be"
              f" removed in Werkzeug 2.1. The {fget.__name__!r} property"
              " will be 'None'. Subclass 'werkzeug.user_agent.UserAgent'"
              " and set 'Request.user_agent_class' to use a different"
              " parser."
          )
  
      def __get__(self, *args, **kwargs):
          warnings.warn(self.message, DeprecationWarning, stacklevel=3)
          return super().__get__(*args, **kwargs)
  
  
  # This is what Request.user_agent returns for now, only show warnings on
  # attribute access, not creation.
  class _UserAgent(_BaseUserAgent):
      _parser = _UserAgentParser()
  
      def __init__(self, string: str) -> None:
          super().__init__(string)
          info = self._parser(string)
          self._platform, self._browser, self._version, self._language = info
  
      @_deprecated_property
      def platform(self) -> t.Optional[str]:  # type: ignore
          return self._platform
  
      @_deprecated_property
      def browser(self) -> t.Optional[str]:  # type: ignore
          return self._browser
  
      @_deprecated_property
      def version(self) -> t.Optional[str]:  # type: ignore
          return self._version
  
      @_deprecated_property
      def language(self) -> t.Optional[str]:  # type: ignore
          return self._language
  
  
  # This is what users might be importing, show warnings on create.
  class UserAgent(_UserAgent):
      """Represents a parsed user agent header value.
  
      This uses a basic parser to try to extract some information from the
      header.
  
      :param environ_or_string: The header value to parse, or a WSGI
          environ containing the header.
  
      .. deprecated:: 2.0
          Will be removed in Werkzeug 2.1. Subclass
          :class:`werkzeug.user_agent.UserAgent` (note the new module
          name) to use a dedicated parser instead.
  
      .. versionchanged:: 2.0
          Passing a WSGI environ is deprecated and will be removed in 2.1.
      """
  
      def __init__(self, environ_or_string: "t.Union[str, WSGIEnvironment]") -> None:
          if isinstance(environ_or_string, dict):
              warnings.warn(
                  "Passing an environ to 'UserAgent' is deprecated and"
                  " will be removed in Werkzeug 2.1. Pass the header"
                  " value string instead.",
                  DeprecationWarning,
                  stacklevel=2,
              )
              string = environ_or_string.get("HTTP_USER_AGENT", "")
          else:
              string = environ_or_string
  
          warnings.warn(
              "The 'werkzeug.useragents' module is deprecated and will be"
              " removed in Werkzeug 2.1. The new base API is"
              " 'werkzeug.user_agent.UserAgent'.",
              DeprecationWarning,
              stacklevel=2,
          )
          super().__init__(string)
  