File Coverage

blib/lib/Validation/Class/Directives.pm

Criterion	Covered	Total	%
statement	81	85	95.2
branch	14	24	58.3
condition	3	5	60.0
subroutine	13	13	100.0
pod	2	3	66.6
total	113	130	86.9

# ABSTRACT: Validation::Class Core Directives Registry

package Validation::Class::Directives;

use strict;
use warnings;

use base 'Validation::Class::Mapping';

use Validation::Class::Util '!has';

use List::MoreUtils 'first_index';
use Module::Find 'usesub';
use Carp 'confess';

use List::MoreUtils;

our $_registry = {};

foreach my $module (usesub 'Validation::Class::Directive') {
    $_registry->{$module} = $module->new
        if $module->isa('Validation::Class::Directive')
    ;
}

our $VERSION = '7.900058'; # VERSION


sub new {

    my $class = shift;

    my $arguments = $class->build_args(@_);

    $arguments = $_registry unless keys %{$arguments};

    my $self = bless {}, $class;

    $self->add($arguments);

    return $self;

}

sub add {

    my $self = shift;

    my $arguments = $self->build_args(@_);

    while (my ($key, $value) = each %{$arguments}) {

        # never overwrite
        unless (defined $self->{$key}) {
            # is it a direct directive?
            if ("Validation::Class::Directive" eq ref $value) {
                $self->{$key} = $value;
            }
            # is it a directive sub-class
            elsif (isa_classref($value)) {
                if ($value->isa("Validation::Class::Directive")) {
                    $self->{$value->name} = $value;
                }
            }
            # is it a hashref
            elsif (isa_hashref($value)) {
                $self->{$key} = Validation::Class::Directive->new($value);
            }
        }

    }

    return $self;

}

sub resolve_dependencies {

    my ($self, $type) = @_;

    $type ||= 'validation';

    my $dependencies = {};

    foreach my $key ($self->keys) {

        my $class      = $self->get($key);
        my $name       = $class->name;
        my $dependents = $class->dependencies->{$type};

        # avoid invalid dependencies by excluding the unknown
        $dependencies->{$name} = [grep { $self->has($_) } @{$dependents}];

    }

    my @ordered;
    my %found;
    my %track;

    my @pending =  keys %$dependencies;
    my $limit   =  scalar(keys %$dependencies);
       $limit   += scalar(@{$_}) for values %$dependencies;

    while (@pending) {

        my $k = shift @pending;

        if (grep { $_ eq $k } @{$dependencies->{$k}}) {

            confess sprintf 'Direct circular dependency on event %s: %s -> %s',
            $type, $k, $k;

        }

        elsif (grep { ! exists $found{$_} } @{$dependencies->{$k}}) {

            confess sprintf 'Invalid dependency on event %s: %s -> %s',
            $type, $k, join(',', @{$dependencies->{$k}})
            if grep { ! exists $dependencies->{$_} } @{$dependencies->{$k}};

            confess
            sprintf 'Indirect circular dependency on event %s: %s -> %s ',
            $type, $k, join(',', @{$dependencies->{$k}})
            if $track{$k} && $track{$k} > $limit; # allowed circular iterations

            $track{$k}++ if push @pending, $k;

        }

        else {

            $found{$k} = 1;
            push @ordered, $k;

        }

    }

    my @list = reverse @ordered;

    foreach my $x (keys %$dependencies) {

        foreach my $y (@{$dependencies->{$x}}) {

            my $a = first_index { $_ eq $x } @list;
            my $b = first_index { $_ eq $y } @list;

            confess sprintf
                'Broken dependency chain; Faulty ordering on '.
                'event %s: %s before %s', $type, $x, $y
                if $a > $b
            ;

        }

    }

    return (@ordered);

}

1;

__END__