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    @type _hostText: L{unicode}

    @ivar _hostBytes: the encoded bytes-representation of the hostname passed
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    @type _hostBytes: L{bytes}

    @ivar _hostStr: the native-string representation of the hostname passed to
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    @type _hostStr: native L{str}

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        @param host: A hostname to connect to.
        @type host: L{bytes} or L{unicode}

        @param port: The port number to connect to.
        @type port: L{int}

        @param timeout: For each individual connection attempt, the number of
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        @type timeout: L{float} or L{int}

        @param bindAddress: the local address of the network interface to make
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        @param attemptDelay: The number of seconds to delay between connection
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        serverFromString(
            reactor, "ssl:443:privateKey=key.pem:certKey=crt.pem")

    If a private key file name (C{privateKey}) isn't provided, a "server.pem"
    file is assumed to exist which contains the private key. If the certificate
    file name (C{certKey}) isn't provided, the private key file is assumed to
    contain the certificate as well.

    You may escape colons in arguments with a backslash, which you will need to
    use if you want to specify a full pathname argument on Windows::

        serverFromString(reactor,
            "ssl:443:privateKey=C\:/key.pem:certKey=C\:/cert.pem")

    finally, the 'unix' prefix may be used to specify a filesystem UNIX socket,
    optionally with a 'mode' argument to specify the mode of the socket file
    created by C{listen}::

        serverFromString(reactor, "unix:/var/run/finger")
        serverFromString(reactor, "unix:/var/run/finger:mode=660")

    This function is also extensible; new endpoint types may be registered as
    L{IStreamServerEndpointStringParser} plugins.  See that interface for more
    information.

    @param reactor: The server endpoint will be constructed with this reactor.

    @param description: The strports description to parse.
    @type description: L{str}

    @return: A new endpoint which can be used to listen with the parameters
        given by C{description}.

    @rtype: L{IStreamServerEndpoint<twisted.internet.interfaces.IStreamServerEndpoint>}

    @raise ValueError: when the 'description' string cannot be parsed.

    @since: 10.2
    Nr1r�)rXrqr�r\�_endpointServerFactories)r~rgZnameOrPluginr�rUryr�rTrTrUr>~s>cCs*d\}}||fD]}|�|||�}q|S)a�
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    you may be tempted to interpolate into a string like this::

        serverFromString(reactor, "ssl:443:privateKey=%s" % (myPathName,))

    This may appear to work, but will have portability issues (Windows
    pathnames, for example).  Usually you should just construct the appropriate
    endpoint type rather than interpolating strings, which in this case would
    be L{SSL4ServerEndpoint}.  There are some use-cases where you may need to
    generate such a string, though; for example, a tool to manipulate a
    configuration file which has strports descriptions in it.  To be correct in
    those cases, do this instead::

        serverFromString(reactor, "ssl:443:privateKey=%s" %
                         (quoteStringArgument(myPathName),))

    @param argument: The part of the endpoint description string you want to
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    arguments except for C{contextFactory}.  Instead, C{certKey} (the path name
    of the certificate file) C{privateKey} (the path name of the private key
    associated with the certificate) are accepted and used to construct a
    context factory.

    Valid positional arguments to this function are host and port.

    @param caCertsDir: The one parameter which is not part of
        L{IReactorSSL.connectSSL}'s signature, this is a path name used to
        construct a list of certificate authority certificates.  The directory
        will be scanned for files ending in C{.pem}, all of which will be
        considered valid certificate authorities for this connection.

    @type caCertsDir: L{str}

    @param hostname: The hostname to use for validating the server's
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    and has the same meaning.  Also C{path} is used instead of C{address}.

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    Construct a client endpoint from a description string.

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    although they take all of their arguments as keywords, aside from host and
    port.

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    like so::

        clientFromString(reactor, "tcp:host=www.example.com:port=80")

    or, without specifying host and port keywords::

        clientFromString(reactor, "tcp:www.example.com:80")

    Or you can specify only one or the other, as in the following 2 examples::

        clientFromString(reactor, "tcp:host=www.example.com:80")
        clientFromString(reactor, "tcp:www.example.com:port=80")

    or an SSL client endpoint with those arguments, plus the arguments used by
    the server SSL, for a client certificate::

        clientFromString(reactor, "ssl:web.example.com:443:"
                                  "privateKey=foo.pem:certKey=foo.pem")

    to specify your certificate trust roots, you can identify a directory with
    PEM files in it with the C{caCertsDir} argument::

        clientFromString(reactor, "ssl:host=web.example.com:port=443:"
                                  "caCertsDir=/etc/ssl/certs")

    Both TCP and SSL client endpoint description strings can include a
    'bindAddress' keyword argument, whose value should be a local IPv4
    address. This fixes the client socket to that IP address::

        clientFromString(reactor, "tcp:www.example.com:80:"
                                  "bindAddress=192.0.2.100")

    NB: Fixed client ports are not currently supported in TCP or SSL
    client endpoints. The client socket will always use an ephemeral
    port assigned by the operating system

    You can create a UNIX client endpoint with the 'path' argument and optional
    'lockfile' and 'timeout' arguments::

        clientFromString(
            reactor, b"unix:path=/var/foo/bar:lockfile=1:timeout=9")

    or, with the path as a positional argument with or without optional
    arguments as in the following 2 examples::

        clientFromString(reactor, "unix:/var/foo/bar")
        clientFromString(reactor, "unix:/var/foo/bar:lockfile=1:timeout=9")

    This function is also extensible; new endpoint types may be registered as
    L{IStreamClientEndpointStringParserWithReactor} plugins.  See that
    interface for more information.

    @param reactor: The client endpoint will be constructed with this reactor.

    @param description: The strports description to parse.
    @type description: L{str}

    @return: A new endpoint which can be used to connect with the parameters
        given by C{description}.
    @rtype: L{IStreamClientEndpoint<twisted.internet.interfaces.IStreamClientEndpoint>}

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        L{twisted.internet.interfaces.IOpenSSLClientConnectionCreator}

    @param wrappedEndpoint: The endpoint to wrap.
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    @type port: L{bytes} or L{unicode}

    @param timeout: For each individual connection attempt, the number of
        seconds to wait before assuming the connection has failed.
    @type timeout: L{bytes} or L{unicode}

    @param bindAddress: The address to which to bind outgoing connections.
    @type bindAddress: L{bytes} or L{unicode}

    @param certificate: a string representing a filesystem path to a
        PEM-encoded certificate.
    @type certificate: L{bytes} or L{unicode}

    @param privateKey: a string representing a filesystem path to a PEM-encoded
        certificate.
    @type privateKey: L{bytes} or L{unicode}

    @param endpoint: an optional string endpoint description of an endpoint to
        wrap; if this is passed then C{host} is used only for certificate
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    @return: a client TLS endpoint
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        @param reactor: The reactor passed to L{clientFromString}.

        @param args: The positional arguments in the endpoint description.
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