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# -*- 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 ); $VERSION = "5.5"; # a module sees its distribution (no version) # a distribution sees its prereqs (which are module names) (usually with versions) # a bundle sees its module names and/or its distributions (no version) sub new { my($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; 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 = $xo->inst_version || "N/A"; my($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)"; } elsif ($xo->isa("CPAN::Distribution")) { $deps[$i]{display_as} = $xo->pretty_id; if ($in_loop) { $xo->{make} = CPAN::Distrostatus->new("NO cannot resolve circular dependency"); } else { $xo->{make} = CPAN::Distrostatus->new("NO one dependency ($loop_starts_with) is a circular dependency"); } $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 }, $class; } sub as_string { my($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;