=head1 Name

lua-uri-ftp - FTP URI support for Lua URI library

=head1 Description

The class C<uri.ftp> is used for URIs with the C<ftp> scheme.  It inherits from
the L<uri._login|lua-uri-_login(3)> class.

FTP URIs with a missing authority part or an empty host part are considered
to be invalid.  An empty path is always normalized to '/'.  The default port
S<is 21>.

=head1 Methods

All the methods defined in L<lua-uri(3)> and L<lua-uri-_login(3)> are
supported, in addition to the following:

=over

=item uri:ftp_typecode(...)

Mutator for the 'type' parameter at the end of the path.  If the optional
argument is supplied then a new type is set, replacing the existing one, or
causing the type parameter to be added to the path if it isn't there already.

=for syntax-highlight lua

    local uri = assert(URI:new("ftp://host/path"))
    uri:ftp_typecode("a")   -- ftp://host/path;type=a
    uri:ftp_typecode(nil)   -- ftp://host/path

Passing in an empty string has the same effect as nil, removing the parameter.
An empty type parameter will be returned as nil, the same as if the parameter
was missing.

=back

=head1 References

This class is based on L<RFC 1738 section 3.2>.  Unfortunately there isn't
currently an RFC for FTP URIs based on the more up to date L<RFC 3986>.

=for comment
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