package URI::gopher; # <draft-murali-url-gopher>, Dec 4, 1996 use strict; use warnings; our $VERSION = '5.09'; use parent 'URI::_server'; 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; } sub gtype { goto &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;