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File Name : 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;
}

Name	Type	Size	Owner/Group	Permission	Last Modified	Actions
.	dir	-	root/root	0755	2024-03-03 08:49:23
..	dir	-	root/root	0755	2024-03-03 08:49:25
RecursiveDependency.pm	text/plain	3.79 KB	root/root	0444	2018-09-22 07:39:13
blocked_urllist.pm	text/plain	920 B	root/root	0444	2014-03-28 03:02:00
yaml_not_installed.pm	text/plain	490 B	root/root	0444	2014-03-28 03:02:00
yaml_process_error.pm	text/plain	1.66 KB	root/root	0444	2014-03-28 03:02:00

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