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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=head1 NAME

CPAN::Kwalify - Interface between CPAN.pm and Kwalify.pm

=head1 SYNOPSIS

  use CPAN::Kwalify;
  validate($schema_name, $data, $file, $doc);

=head1 DESCRIPTION

=over

=item _validate($schema_name, $data, $file, $doc)

$schema_name is the name of a supported schema. Currently only
C<distroprefs> is supported. $data is the data to be validated. $file
is the absolute path to the file the data are coming from. $doc is the
index of the document within $doc that is to be validated. The last
two arguments are only there for better error reporting.

Relies on being called from within CPAN.pm.

Dies if something fails. Does not return anything useful.

=item yaml($schema_name)

Returns the YAML text of that schema. Dies if something fails.

=back

=head1 AUTHOR

Andreas Koenig C<< <andk@cpan.org> >>

=head1 LICENSE

This program is free software; you can redistribute it and/or
modify it under the same terms as Perl itself.

See L<http://www.perl.com/perl/misc/Artistic.html>



=cut


use strict;

package CPAN::Kwalify;
use vars qw($VERSION $VAR1);
$VERSION = "5.50";

use File::Spec ();

my %vcache = ();

my $schema_loaded = {};

sub _validate {
    my($schema_name,$data,$abs,$y) = @_;
    my $yaml_module = CPAN->_yaml_module;
    if (
        $CPAN::META->has_inst($yaml_module)
        &&
        $CPAN::META->has_inst("Kwalify")
       ) {
        my $load = UNIVERSAL::can($yaml_module,"Load");
        unless ($schema_loaded->{$schema_name}) {
            eval {
                my $schema_yaml = yaml($schema_name);
                $schema_loaded->{$schema_name} = $load->($schema_yaml);
            };
            if ($@) {
                # we know that YAML.pm 0.62 cannot parse the schema,
                # so we try a fallback
                my $content = do {
                    my $path = __FILE__;
                    $path =~ s/\.pm$//;
                    $path = File::Spec->catfile($path, "$schema_name.dd");
                    local *FH;
                    open FH, $path or die "Could not open '$path': $!";
                    local $/;
                    <FH>;
                };
                $VAR1 = undef;
                eval $content;
                if (my $err = $@) {
                    die "parsing of '$schema_name.dd' failed: $err";
                }
                $schema_loaded->{$schema_name} = $VAR1;
            }
        }
    }
    if (my $schema = $schema_loaded->{$schema_name}) {
        my $mtime = (stat $abs)[9];
        for my $k (keys %{$vcache{$abs}}) {
            delete $vcache{$abs}{$k} unless $k eq $mtime;
        }
        return if $vcache{$abs}{$mtime}{$y}++;
        eval { Kwalify::validate($schema, $data) };
        if (my $err = $@) {
            my $info = {}; yaml($schema_name, info => $info);
            die "validation of distropref '$abs'[$y] against schema '$info->{path}' failed: $err";
        }
    }
}

sub _clear_cache {
    %vcache = ();
}

sub yaml {
    my($schema_name, %opt) = @_;
    my $content = do {
        my $path = __FILE__;
        $path =~ s/\.pm$//;
        $path = File::Spec->catfile($path, "$schema_name.yml");
        if ($opt{info}) {
            $opt{info}{path} = $path;
        }
        local *FH;
        open FH, $path or die "Could not open '$path': $!";
        local $/;
        <FH>;
    };
    return $content;
}

1;

# Local Variables:
# mode: cperl
# cperl-indent-level: 4
# End:

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