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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 $new_type =~ /^[0-9+IgT]$/;
- 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;
-