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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Current File : //proc/thread-self/root/usr/share/perl5/vendor_perl/CPAN/Exception/RecursiveDependency.pm
# -*- Mode: cperl; coding: utf-8; cperl-indent-level: 4 -*-
# vim: ts=4 sts=4 sw=4:
package CPAN::Exception::RecursiveDependency;
use strict;
use overload '""' => "as_string";

use vars qw(
            $VERSION
);
$VERSION = "5.5001";

{
    package CPAN::Exception::RecursiveDependency::na;
    use overload '""' => "as_string";
    sub new { bless {}, shift };
    sub as_string { "N/A" };
}

my $NA = CPAN::Exception::RecursiveDependency::na->new;

# a module sees its distribution (no version)
# a distribution sees its prereqs (which are module names) (usually with versions)
# a bundle sees its module names and/or its distributions (no version)

sub new {
    my($class) = shift;
    my($deps_arg) = shift;
    my (@deps,%seen,$loop_starts_with);
  DCHAIN: for my $dep (@$deps_arg) {
        push @deps, {name => $dep, display_as => $dep};
        if ($seen{$dep}++) {
            $loop_starts_with = $dep;
            last DCHAIN;
        }
    }
    my $in_loop = 0;
    my %mark;
 DWALK: for my $i (0..$#deps) {
        my $x = $deps[$i]{name};
        $in_loop ||= $loop_starts_with && $x eq $loop_starts_with;
        my $xo = CPAN::Shell->expandany($x) or next;
        if ($xo->isa("CPAN::Module")) {
            my $have = $xo->inst_version || $NA;
            my($want,$d,$want_type);
            if ($i>0 and $d = $deps[$i-1]{name}) {
                my $do = CPAN::Shell->expandany($d);
                $want = $do->{prereq_pm}{requires}{$x};
                if (defined $want) {
                    $want_type = "requires: ";
                } else {
                    $want = $do->{prereq_pm}{build_requires}{$x};
                    if (defined $want) {
                        $want_type = "build_requires: ";
                    } else {
                        $want_type = "unknown status";
                        $want = "???";
                    }
                }
            } else {
                $want = $xo->cpan_version;
                $want_type = "want: ";
            }
            $deps[$i]{have} = $have;
            $deps[$i]{want_type} = $want_type;
            $deps[$i]{want} = $want;
            $deps[$i]{display_as} = "$x (have: $have; $want_type$want)";
            if ((! ref $have || !$have->isa('CPAN::Exception::RecursiveDependency::na'))
                && CPAN::Version->vge($have, $want)) {
                # https://rt.cpan.org/Ticket/Display.html?id=115340
                undef $loop_starts_with;
                last DWALK;
            }
        } elsif ($xo->isa("CPAN::Distribution")) {
            my $pretty = $deps[$i]{display_as} = $xo->pretty_id;
            my $mark_as;
            if ($in_loop) {
                $mark_as = CPAN::Distrostatus->new("NO cannot resolve circular dependency");
            } else {
                $mark_as = CPAN::Distrostatus->new("NO one dependency ($loop_starts_with) is a circular dependency");
            }
            $mark{$pretty} = { xo => $xo, mark_as => $mark_as };
        }
    }
    if ($loop_starts_with) {
        while (my($k,$v) = each %mark) {
            my $xo = $v->{xo};
            $xo->{make} = $v->{mark_as};
            $xo->store_persistent_state; # otherwise I will not reach
                                         # all involved parties for
                                         # the next session
        }
    }
    bless { deps => \@deps, loop_starts_with => $loop_starts_with }, $class;
}

sub is_resolvable {
    ! defined shift->{loop_starts_with};
}

sub as_string {
    my($self) = shift;
    my $deps = $self->{deps};
    my $loop_starts_with = $self->{loop_starts_with};
    unless ($loop_starts_with) {
        return "--not a recursive/circular dependency--";
    }
    my $ret = "\nRecursive dependency detected:\n    ";
    $ret .= join("\n => ", map {$_->{display_as}} @$deps);
    $ret .= ".\nCannot resolve.\n";
    $ret;
}

1;

haha - 2025