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 SIMPAN PERUBAHAN