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package URI::gopher; # <draft-murali-url-gopher>, Dec 4, 1996
require URI::_server;
@ISA=qw(URI::_server);
use strict;
use URI::Escape qw(uri_unescape);
# A Gopher URL follows the common internet scheme syntax as defined in
# section 4.3 of [RFC-URL-SYNTAX]:
#
# gopher://<host>[:<port>]/<gopher-path>
#
# where
#
# <gopher-path> := <gopher-type><selector> |
# <gopher-type><selector>%09<search> |
# <gopher-type><selector>%09<search>%09<gopher+_string>
#
# <gopher-type> := '0' | '1' | '2' | '3' | '4' | '5' | '6' | '7'
# '8' | '9' | '+' | 'I' | 'g' | 'T'
#
# <selector> := *pchar Refer to RFC 1808 [4]
# <search> := *pchar
# <gopher+_string> := *uchar Refer to RFC 1738 [3]
#
# If the optional port is omitted, the port defaults to 70.
sub default_port { 70 }
sub _gopher_type
{
my $self = shift;
my $path = $self->path_query;
$path =~ s,^/,,;
my $gtype = $1 if $path =~ s/^(.)//s;
if (@_) {
my $new_type = shift;
if (defined($new_type)) {
Carp::croak("Bad gopher type '$new_type'")
unless length($new_type) == 1;
substr($path, 0, 0) = $new_type;
$self->path_query($path);
} else {
Carp::croak("Can't delete gopher type when selector is present")
if length($path);
$self->path_query(undef);
}
}
return $gtype;
}
sub gopher_type
{
my $self = shift;
my $gtype = $self->_gopher_type(@_);
$gtype = "1" unless defined $gtype;
$gtype;
}
*gtype = \&gopher_type; # URI::URL compatibility
sub selector { shift->_gfield(0, @_) }
sub search { shift->_gfield(1, @_) }
sub string { shift->_gfield(2, @_) }
sub _gfield
{
my $self = shift;
my $fno = shift;
my $path = $self->path_query;
# not according to spec., but many popular browsers accept
# gopher URLs with a '?' before the search string.
$path =~ s/\?/\t/;
$path = uri_unescape($path);
$path =~ s,^/,,;
my $gtype = $1 if $path =~ s,^(.),,s;
my @path = split(/\t/, $path, 3);
if (@_) {
# modify
my $new = shift;
$path[$fno] = $new;
pop(@path) while @path && !defined($path[-1]);
for (@path) { $_="" unless defined }
$path = $gtype;
$path = "1" unless defined $path;
$path .= join("\t", @path);
$self->path_query($path);
}
$path[$fno];
}
1;
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