/usr/share/perl5/Regexp/Common/URI/gopher.pm is in libregexp-common-perl 2013031301-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 | package Regexp::Common::URI::gopher;
use Regexp::Common qw /pattern clean no_defaults/;
use Regexp::Common::URI qw /register_uri/;
use Regexp::Common::URI::RFC1738 qw /$host $port $uchars/;
use Regexp::Common::URI::RFC1808 qw /$pchars $pchar_range/;
use strict;
use warnings;
use vars qw /$VERSION/;
$VERSION = '2010010201';
my $pchars_notab = "(?:(?:[$pchar_range]+|" .
"%(?:[1-9a-fA-F][0-9a-fA-F]|0[0-8a-fA-F]))*)";
my $gopherplus_string = $pchars;
my $search = $pchars;
my $search_notab = $pchars_notab;
my $selector = $pchars;
my $selector_notab = $pchars_notab;
my $gopher_type = "(?:[0-9+IgT])";
my $scheme = "gopher";
my $uri = "(?k:(?k:$scheme)://(?k:$host)(?::(?k:$port))?" .
"/(?k:(?k:$gopher_type)(?k:$selector)))";
my $uri_notab = "(?k:(?k:$scheme)://(?k:$host)(?::(?k:$port))?" .
"/(?k:(?k:$gopher_type)(?k:$selector_notab)" .
"(?:%09(?k:$search_notab)(?:%09(?k:$gopherplus_string))?)?))";
register_uri $scheme => $uri;
pattern name => [qw (URI gopher -notab=)],
create => sub { exists $_ [1] {-notab} &&
!defined $_ [1] {-notab} ? $uri_notab : $uri},
;
1;
__END__
=pod
=head1 NAME
Regexp::Common::URI::gopher -- Returns a pattern for gopher URIs.
=head1 SYNOPSIS
use Regexp::Common qw /URI/;
while (<>) {
/$RE{URI}{gopher}/ and print "Contains a gopher URI.\n";
}
=head1 DESCRIPTION
=head2 $RE{URI}{gopher}{-notab}
Gopher URIs are poorly defined. Originally, RFC 1738 defined gopher URIs,
but they were later redefined in an internet draft. One that was expired
in June 1997.
The internet draft for gopher URIs defines them as follows:
"gopher:" "//" host [ ":" port ] "/" gopher-type selector
[ "%09" search [ "%09" gopherplus_string ]]
Unfortunally, a I<selector> is defined in such a way that characters
may be escaped using the URI escape mechanism. This includes tabs,
which escaped are C<%09>. Hence, the syntax cannot distinguish between
a URI that has both a I<selector> and a I<search> part, and an URI
where the I<selector> includes an escaped tab. (The text of the draft
forbids tabs to be present in the I<selector> though).
C<$RE{URI}{gopher}> follows the defined syntax. To disallow escaped
tabs in the I<selector> and I<search> parts, use C<$RE{URI}{gopher}{-notab}>.
There are other differences between the text and the given syntax.
According to the text, selector strings cannot have tabs, linefeeds
or carriage returns in them. The text also allows the entire I<gopher-path>,
(the part after the slash following the hostport) to be empty; if this
is empty the slash may be omitted as well. However, this isn't reflected
in the syntax.
Under C<{-keep}>, the following are returned:
=over 4
=item $1
The entire URI.
=item $2
The scheme.
=item $3
The host (name or address).
=item $4
The port (if any).
=item $5
The "gopher-path", the part after the / following the host and port.
=item $6
The gopher-type.
=item $7
The selector. (When no C<{-notab}> is used, this includes the search
and gopherplus_string, including the separating escaped tabs).
=item $8
The search, if given. (Only when C<{-notab}> is given).
=item $9
The gopherplus_string, if given. (Only when C<{-notab}> is given).
=back
head1 REFERENCES
=over 4
=item B<[RFC 1738]>
Berners-Lee, Tim, Masinter, L., McCahill, M.: I<Uniform Resource
Locators (URL)>. December 1994.
=item B<[RFC 1808]>
Fielding, R.: I<Relative Uniform Resource Locators (URL)>. June 1995.
=item B<[GOPHER URL]>
Krishnan, Murali R., Casey, James: "A Gopher URL Format". Expired
Internet draft I<draft-murali-url-gopher>. December 1996.
=back
=head1 SEE ALSO
L<Regexp::Common::URI> for other supported URIs.
=head1 AUTHOR
Damian Conway (damian@conway.org)
=head1 MAINTAINANCE
This package is maintained by Abigail S<(I<regexp-common@abigail.be>)>.
=head1 BUGS AND IRRITATIONS
Bound to be plenty.
=head1 LICENSE and COPYRIGHT
This software is Copyright (c) 2001 - 2009, Damian Conway and Abigail.
This module is free software, and maybe used under any of the following
licenses:
1) The Perl Artistic License. See the file COPYRIGHT.AL.
2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
3) The BSD Licence. See the file COPYRIGHT.BSD.
4) The MIT Licence. See the file COPYRIGHT.MIT.
=cut
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