晋太元中，武陵人捕鱼为业。缘溪行，忘路之远近。忽逢桃花林，夹岸数百步，中无杂树，芳草鲜美，落英缤纷。渔人甚异之，复前行，欲穷其林。 　　林尽水源，便得一山，山有小口，仿佛若有光。便舍船，从口入。初极狭，才通人。复行数十步，豁然开朗。土地平旷，屋舍俨然，有良田、美池、桑竹之属。阡陌交通，鸡犬相闻。其中往来种作，男女衣着，悉如外人。黄发垂髫，并怡然自乐。 　　见渔人，乃大惊，问所从来。具答之。便要还家，设酒杀鸡作食。村中闻有此人，咸来问讯。自云先世避秦时乱，率妻子邑人来此绝境，不复出焉，遂与外人间隔。问今是何世，乃不知有汉，无论魏晋。此人一一为具言所闻，皆叹惋。余人各复延至其家，皆出酒食。停数日，辞去。此中人语云：“不足为外人道也。”(间隔 一作：隔绝) 　　既出，得其船，便扶向路，处处志之。及郡下，诣太守，说如此。太守即遣人随其往，寻向所志，遂迷，不复得路。 　　南阳刘子骥，高尚士也，闻之，欣然规往。未果，寻病终。后遂无问津者。 .
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Directory :  /usr/share/perl5/vendor_perl/WWW/RobotRules/

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Current File : //usr/share/perl5/vendor_perl/WWW/RobotRules/AnyDBM_File.pm
package WWW::RobotRules::AnyDBM_File;

require  WWW::RobotRules;
@ISA = qw(WWW::RobotRules);
$VERSION = "6.00";

use Carp ();
use AnyDBM_File;
use Fcntl;
use strict;

=head1 NAME

WWW::RobotRules::AnyDBM_File - Persistent RobotRules

=head1 SYNOPSIS

 require WWW::RobotRules::AnyDBM_File;
 require LWP::RobotUA;

 # Create a robot useragent that uses a diskcaching RobotRules
 my $rules = WWW::RobotRules::AnyDBM_File->new( 'my-robot/1.0', 'cachefile' );
 my $ua = WWW::RobotUA->new( 'my-robot/1.0', 'me@foo.com', $rules );

 # Then just use $ua as usual
 $res = $ua->request($req);

=head1 DESCRIPTION

This is a subclass of I<WWW::RobotRules> that uses the AnyDBM_File
package to implement persistent diskcaching of F<robots.txt> and host
visit information.

The constructor (the new() method) takes an extra argument specifying
the name of the DBM file to use.  If the DBM file already exists, then
you can specify undef as agent name as the name can be obtained from
the DBM database.

=cut

sub new 
{ 
  my ($class, $ua, $file) = @_;
  Carp::croak('WWW::RobotRules::AnyDBM_File filename required') unless $file;

  my $self = bless { }, $class;
  $self->{'filename'} = $file;
  tie %{$self->{'dbm'}}, 'AnyDBM_File', $file, O_CREAT|O_RDWR, 0640
    or Carp::croak("Can't open $file: $!");
  
  if ($ua) {
      $self->agent($ua);
  }
  else {
      # Try to obtain name from DBM file
      $ua = $self->{'dbm'}{"|ua-name|"};
      Carp::croak("No agent name specified") unless $ua;
  }

  $self;
}

sub agent {
    my($self, $newname) = @_;
    my $old = $self->{'dbm'}{"|ua-name|"};
    if (defined $newname) {
	$newname =~ s!/?\s*\d+.\d+\s*$!!;  # loose version
	unless ($old && $old eq $newname) {
	# Old info is now stale.
	    my $file = $self->{'filename'};
	    untie %{$self->{'dbm'}};
	    tie %{$self->{'dbm'}}, 'AnyDBM_File', $file, O_TRUNC|O_RDWR, 0640;
	    %{$self->{'dbm'}} = ();
	    $self->{'dbm'}{"|ua-name|"} = $newname;
	}
    }
    $old;
}

sub no_visits {
    my ($self, $netloc) = @_;
    my $t = $self->{'dbm'}{"$netloc|vis"};
    return 0 unless $t;
    (split(/;\s*/, $t))[0];
}

sub last_visit {
    my ($self, $netloc) = @_;
    my $t = $self->{'dbm'}{"$netloc|vis"};
    return undef unless $t;
    (split(/;\s*/, $t))[1];
}

sub fresh_until {
    my ($self, $netloc, $fresh) = @_;
    my $old = $self->{'dbm'}{"$netloc|exp"};
    if ($old) {
	$old =~ s/;.*//;  # remove cleartext
    }
    if (defined $fresh) {
	$fresh .= "; " . localtime($fresh);
	$self->{'dbm'}{"$netloc|exp"} = $fresh;
    }
    $old;
}

sub visit {
    my($self, $netloc, $time) = @_;
    $time ||= time;

    my $count = 0;
    my $old = $self->{'dbm'}{"$netloc|vis"};
    if ($old) {
	my $last;
	($count,$last) = split(/;\s*/, $old);
	$time = $last if $last > $time;
    }
    $count++;
    $self->{'dbm'}{"$netloc|vis"} = "$count; $time; " . localtime($time);
}

sub push_rules {
    my($self, $netloc, @rules) = @_;
    my $cnt = 1;
    $cnt++ while $self->{'dbm'}{"$netloc|r$cnt"};

    foreach (@rules) {
	$self->{'dbm'}{"$netloc|r$cnt"} = $_;
	$cnt++;
    }
}

sub clear_rules {
    my($self, $netloc) = @_;
    my $cnt = 1;
    while ($self->{'dbm'}{"$netloc|r$cnt"}) {
	delete $self->{'dbm'}{"$netloc|r$cnt"};
	$cnt++;
    }
}

sub rules {
    my($self, $netloc) = @_;
    my @rules = ();
    my $cnt = 1;
    while (1) {
	my $rule = $self->{'dbm'}{"$netloc|r$cnt"};
	last unless $rule;
	push(@rules, $rule);
	$cnt++;
    }
    @rules;
}

sub dump
{
}

1;

=head1 SEE ALSO

L<WWW::RobotRules>, L<LWP::RobotUA>

=head1 AUTHORS

Hakan Ardo E<lt>hakan@munin.ub2.lu.se>, Gisle Aas E<lt>aas@sn.no>

=cut

haha - 2025