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 : //usr/share/perl5/vendor_perl/inc/latest/private.pm
use strict;
use warnings;

package inc::latest::private;
# ABSTRACT: private implementation for inc::latest

our $VERSION = '0.500';

use File::Spec;
use IO::File;

# must ultimately "goto" the import routine of the module to be loaded
# so that the calling package is correct when $mod->import() runs.
sub import {
    my ( $package, $mod, @args ) = @_;
    my $file = $package->_mod2path($mod);

    if ( $INC{$file} ) {
        # Already loaded, but let _load_module handle import args
        goto \&_load_module;
    }

    # A bundled copy must be present
    my ( $bundled, $bundled_dir ) = $package->_search_bundled($file)
      or die "No bundled copy of $mod found";

    my $from_inc = $package->_search_INC($file);
    unless ($from_inc) {
        # Only bundled is available
        unshift( @INC, $bundled_dir );
        goto \&_load_module;
    }

    if ( _version($from_inc) >= _version($bundled) ) {
        # Ignore the bundled copy
        goto \&_load_module;
    }

    # Load the bundled copy
    unshift( @INC, $bundled_dir );
    goto \&_load_module;
}

sub _version {
    require ExtUtils::MakeMaker;
    return ExtUtils::MM->parse_version(shift);
}

# use "goto" for import to preserve caller
sub _load_module {
    my $package = shift; # remaining @_ is ready for goto
    my ( $mod, @args ) = @_;
    eval "require $mod; 1" or die $@;
    if ( my $import = $mod->can('import') ) {
        goto $import;
    }
    return 1;
}

sub _search_bundled {
    my ( $self, $file ) = @_;

    my $mypath = 'inc';

    local *DH; # Maintain 5.005 compatibility
    opendir DH, $mypath or die "Can't open directory $mypath: $!";

    while ( defined( my $e = readdir DH ) ) {
        next unless $e =~ /^inc_/;
        my $try = File::Spec->catfile( $mypath, $e, $file );

        return ( $try, File::Spec->catdir( $mypath, $e ) ) if -e $try;
    }
    return;
}

# Look for the given path in @INC.
sub _search_INC {
    # TODO: doesn't handle coderefs or arrayrefs or objects in @INC, but
    # it probably should
    my ( $self, $file ) = @_;

    foreach my $dir (@INC) {
        next if ref $dir;
        my $try = File::Spec->catfile( $dir, $file );
        return $try if -e $try;
    }

    return;
}

# Translate a module name into a directory/file.pm to search for in @INC
sub _mod2path {
    my ( $self, $mod ) = @_;
    my @parts = split /::/, $mod;
    $parts[-1] .= '.pm';
    return $parts[0] if @parts == 1;
    return File::Spec->catfile(@parts);
}

1;


# vim: ts=4 sts=4 sw=4 tw=75 et:

__END__

=pod

=encoding UTF-8

=head1 NAME

inc::latest::private - private implementation for inc::latest

=head1 VERSION

version 0.500

=head1 DESCRIPTION

This module has the private methods used to find and load bundled modules.
It should not be used directly.

=head1 AUTHORS

=over 4

=item *

David Golden <dagolden@cpan.org>

=item *

Eric Wilhelm <ewilhelm@cpan.org>

=back

=head1 COPYRIGHT AND LICENSE

This software is Copyright (c) 2009 by David Golden.

This is free software, licensed under:

  The Apache License, Version 2.0, January 2004

=cut

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