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Direktori : /usr/share/perl5/vendor_perl/Regexp/Common/URI/ |
Current File : //usr/share/perl5/vendor_perl/Regexp/Common/URI/gopher.pm |
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