1package Module::Load; 2 3$VERSION = '0.16'; 4 5use strict; 6use File::Spec (); 7 8sub import { 9 my $who = _who(); 10 11 { no strict 'refs'; 12 *{"${who}::load"} = *load; 13 } 14} 15 16sub load (*;@) { 17 my $mod = shift or return; 18 my $who = _who(); 19 20 if( _is_file( $mod ) ) { 21 require $mod; 22 } else { 23 LOAD: { 24 my $err; 25 for my $flag ( qw[1 0] ) { 26 my $file = _to_file( $mod, $flag); 27 eval { require $file }; 28 $@ ? $err .= $@ : last LOAD; 29 } 30 die $err if $err; 31 } 32 } 33 34 ### This addresses #41883: Module::Load cannot import 35 ### non-Exporter module. ->import() routines weren't 36 ### properly called when load() was used. 37 { no strict 'refs'; 38 my $import; 39 if (@_ and $import = $mod->can('import')) { 40 unshift @_, $mod; 41 goto &$import; 42 } 43 } 44} 45 46sub _to_file{ 47 local $_ = shift; 48 my $pm = shift || ''; 49 50 my @parts = split /::/; 51 52 ### because of [perl #19213], see caveats ### 53 my $file = $^O eq 'MSWin32' 54 ? join "/", @parts 55 : File::Spec->catfile( @parts ); 56 57 $file .= '.pm' if $pm; 58 59 ### on perl's before 5.10 (5.9.5@31746) if you require 60 ### a file in VMS format, it's stored in %INC in VMS 61 ### format. Therefor, better unixify it first 62 ### Patch in reply to John Malmbergs patch (as mentioned 63 ### above) on p5p Tue 21 Aug 2007 04:55:07 64 $file = VMS::Filespec::unixify($file) if $^O eq 'VMS'; 65 66 return $file; 67} 68 69sub _who { (caller(1))[0] } 70 71sub _is_file { 72 local $_ = shift; 73 return /^\./ ? 1 : 74 /[^\w:']/ ? 1 : 75 undef 76 #' silly bbedit.. 77} 78 79 801; 81 82__END__ 83 84=pod 85 86=head1 NAME 87 88Module::Load - runtime require of both modules and files 89 90=head1 SYNOPSIS 91 92 use Module::Load; 93 94 my $module = 'Data:Dumper'; 95 load Data::Dumper; # loads that module 96 load 'Data::Dumper'; # ditto 97 load $module # tritto 98 99 my $script = 'some/script.pl' 100 load $script; 101 load 'some/script.pl'; # use quotes because of punctuations 102 103 load thing; # try 'thing' first, then 'thing.pm' 104 105 load CGI, ':standard' # like 'use CGI qw[:standard]' 106 107 108=head1 DESCRIPTION 109 110C<load> eliminates the need to know whether you are trying to require 111either a file or a module. 112 113If you consult C<perldoc -f require> you will see that C<require> will 114behave differently when given a bareword or a string. 115 116In the case of a string, C<require> assumes you are wanting to load a 117file. But in the case of a bareword, it assumes you mean a module. 118 119This gives nasty overhead when you are trying to dynamically require 120modules at runtime, since you will need to change the module notation 121(C<Acme::Comment>) to a file notation fitting the particular platform 122you are on. 123 124C<load> eliminates the need for this overhead and will just DWYM. 125 126=head1 Rules 127 128C<load> has the following rules to decide what it thinks you want: 129 130=over 4 131 132=item * 133 134If the argument has any characters in it other than those matching 135C<\w>, C<:> or C<'>, it must be a file 136 137=item * 138 139If the argument matches only C<[\w:']>, it must be a module 140 141=item * 142 143If the argument matches only C<\w>, it could either be a module or a 144file. We will try to find C<file> first in C<@INC> and if that fails, 145we will try to find C<file.pm> in @INC. 146If both fail, we die with the respective error messages. 147 148=back 149 150=head1 Caveats 151 152Because of a bug in perl (#19213), at least in version 5.6.1, we have 153to hardcode the path separator for a require on Win32 to be C</>, like 154on Unix rather than the Win32 C<\>. Otherwise perl will not read its 155own %INC accurately double load files if they are required again, or 156in the worst case, core dump. 157 158C<Module::Load> cannot do implicit imports, only explicit imports. 159(in other words, you always have to specify explicitly what you wish 160to import from a module, even if the functions are in that modules' 161C<@EXPORT>) 162 163=head1 ACKNOWLEDGEMENTS 164 165Thanks to Jonas B. Nielsen for making explicit imports work. 166 167=head1 BUG REPORTS 168 169Please report bugs or other issues to E<lt>bug-module-load@rt.cpan.org<gt>. 170 171=head1 AUTHOR 172 173This module by Jos Boumans E<lt>kane@cpan.orgE<gt>. 174 175=head1 COPYRIGHT 176 177This library is free software; you may redistribute and/or modify it 178under the same terms as Perl itself. 179 180 181=cut 182