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package Module::Load;
use strict;
use warnings;
use File::Spec ();
our $VERSION = '0.36';
sub import {
my $who = _who();
my $h; shift;
{ no strict 'refs';
@_ or (
*{"${who}::load"} = \&load, # compat to prev version
*{"${who}::autoload"} = \&autoload,
return
);
map { $h->{$_} = () if defined $_ } @_;
(exists $h->{none} or exists $h->{''})
and shift, last;
((exists $h->{autoload} and shift,1) or (exists $h->{all} and shift))
and *{"${who}::autoload"} = \&autoload;
((exists $h->{load} and shift,1) or exists $h->{all})
and *{"${who}::load"} = \&load;
((exists $h->{load_remote} and shift,1) or exists $h->{all})
and *{"${who}::load_remote"} = \&load_remote;
((exists $h->{autoload_remote} and shift,1) or exists $h->{all})
and *{"${who}::autoload_remote"} = \&autoload_remote;
}
}
sub load(*;@){
goto &_load;
}
sub autoload(*;@){
unshift @_, 'autoimport';
goto &_load;
}
sub load_remote($$;@){
my ($dst, $src, @exp) = @_;
eval "package $dst;Module::Load::load('$src', qw/@exp/);";
$@ && die "$@";
}
sub autoload_remote($$;@){
my ($dst, $src, @exp) = @_;
eval "package $dst;Module::Load::autoload('$src', qw/@exp/);";
$@ && die "$@";
}
sub _load{
my $autoimport = $_[0] eq 'autoimport' and shift;
my $mod = shift or return;
my $who = _who();
if( _is_file( $mod ) ) {
require $mod;
} else {
LOAD: {
my $err;
for my $flag ( qw[1 0] ) {
my $file = _to_file( $mod, $flag);
eval { require $file };
$@ ? $err .= $@ : last LOAD;
}
die $err if $err;
}
}
### This addresses #41883: Module::Load cannot import
### non-Exporter module. ->import() routines weren't
### properly called when load() was used.
{ no strict 'refs';
my $import;
((@_ or $autoimport) and (
$import = $mod->can('import')
) and (
unshift(@_, $mod),
goto &$import
)
);
}
}
sub _to_file{
local $_ = shift;
my $pm = shift || '';
## trailing blanks ignored by default. [rt #69886]
my @parts = split /::|'/, $_, -1;
## make sure that we can't hop out of @INC
shift @parts if @parts && !$parts[0];
### because of [perl #19213], see caveats ###
my $file = $^O eq 'MSWin32'
? join "/", @parts
: File::Spec->catfile( @parts );
$file .= '.pm' if $pm;
### on perl's before 5.10 (5.9.5@31746) if you require
### a file in VMS format, it's stored in %INC in VMS
### format. Therefor, better unixify it first
### Patch in reply to John Malmbergs patch (as mentioned
### above) on p5p Tue 21 Aug 2007 04:55:07
$file = VMS::Filespec::unixify($file) if $^O eq 'VMS';
return $file;
}
sub _who { (caller(1))[0] }
sub _is_file {
local $_ = shift;
return /^\./ ? 1 :
/[^\w:']/ ? 1 :
undef
#' silly bbedit..
}
1;
__END__
=pod
=head1 NAME
Module::Load - runtime require of both modules and files
=head1 SYNOPSIS
use Module::Load;
my $module = 'Data::Dumper';
load Data::Dumper; # loads that module, but not import any functions
# -> cannot use 'Dumper' function
load 'Data::Dumper'; # ditto
load $module # tritto
autoload Data::Dumper; # loads that module and imports the default functions
# -> can use 'Dumper' function
my $script = 'some/script.pl'
load $script;
load 'some/script.pl'; # use quotes because of punctuations
load thing; # try 'thing' first, then 'thing.pm'
load CGI, ':all'; # like 'use CGI qw[:standard]'
=head1 DESCRIPTION
C<Module::Load> eliminates the need to know whether you are trying
to require either a file or a module.
If you consult C<perldoc -f require> you will see that C<require> will
behave differently when given a bareword or a string.
In the case of a string, C<require> assumes you are wanting to load a
file. But in the case of a bareword, it assumes you mean a module.
This gives nasty overhead when you are trying to dynamically require
modules at runtime, since you will need to change the module notation
(C<Acme::Comment>) to a file notation fitting the particular platform
you are on.
C<Module::Load> eliminates the need for this overhead and will
just DWYM.
=head2 Difference between C<load> and C<autoload>
C<Module::Load> imports the two functions - C<load> and C<autoload>
C<autoload> imports the default functions automatically,
but C<load> do not import any functions.
C<autoload> is usable under C<BEGIN{};>.
Both the functions can import the functions that are specified.
Following codes are same.
load File::Spec::Functions, qw/splitpath/;
autoload File::Spec::Functions, qw/splitpath/;
=head1 FUNCTIONS
=over 4
=item load
Loads a specified module.
See L</Rules> for detailed loading rule.
=item autoload
Loads a specified module and imports the default functions.
Except importing the functions, 'autoload' is same as 'load'.
=item load_remote
Loads a specified module to the specified package.
use Module::Load 'load_remote';
my $pkg = 'Other::Package';
load_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package'
# but do not import 'Dumper' function
A module for loading must be quoted.
Except specifing the package and quoting module name,
'load_remote' is same as 'load'.
=item autoload_remote
Loads a specified module and imports the default functions to the specified package.
use Module::Load 'autoload_remote';
my $pkg = 'Other::Package';
autoload_remote $pkg, 'Data::Dumper'; # load a module to 'Other::Package'
# and imports 'Dumper' function
A module for loading must be quoted.
Except specifing the package and quoting module name,
'autoload_remote' is same as 'load_remote'.
=back
=head1 Rules
All functions have the following rules to decide what it thinks
you want:
=over 4
=item *
If the argument has any characters in it other than those matching
C<\w>, C<:> or C<'>, it must be a file
=item *
If the argument matches only C<[\w:']>, it must be a module
=item *
If the argument matches only C<\w>, it could either be a module or a
file. We will try to find C<file.pm> first in C<@INC> and if that
fails, we will try to find C<file> in @INC. If both fail, we die with
the respective error messages.
=back
=head1 IMPORTS THE FUNCTIONS
'load' and 'autoload' are imported by default, but 'load_remote' and
'autoload_remote' are not imported.
To use 'load_remote' or 'autoload_remote', specify at 'use'.
=over 4
=item "load","autoload","load_remote","autoload_remote"
Imports the selected functions.
# imports 'load' and 'autoload' (default)
use Module::Load;
# imports 'autoload' only
use Module::Load 'autoload';
# imports 'autoload' and 'autoload_remote', but don't import 'load';
use Module::Load qw/autoload autoload_remote/;
=item 'all'
Imports all the functions.
use Module::Load 'all'; # imports load, autoload, load_remote, autoload_remote
=item '','none',undef
Not import any functions (C<load> and C<autoload> are not imported).
use Module::Load '';
use Module::Load 'none';
use Module::Load undef;
=back
=head1 Caveats
Because of a bug in perl (#19213), at least in version 5.6.1, we have
to hardcode the path separator for a require on Win32 to be C</>, like
on Unix rather than the Win32 C<\>. Otherwise perl will not read its
own %INC accurately double load files if they are required again, or
in the worst case, core dump.
C<Module::Load> cannot do implicit imports, only explicit imports.
(in other words, you always have to specify explicitly what you wish
to import from a module, even if the functions are in that modules'
C<@EXPORT>)
=head1 SEE ALSO
L<Module::Runtime> provides functions for loading modules,
checking the validity of a module name,
converting a module name to partial C<.pm> path,
and related utility functions.
L<"require" in perlfunc|https://metacpan.org/pod/perlfunc#require>
and
L<"use" in perlfunc|https://metacpan.org/pod/perlfunc#use>.
L<Mojo::Loader> is a "class loader and plugin framework",
and is included in the
L<Mojolicious|https://metacpan.org/release/Mojolicious> distribution.
L<Module::Loader> is a module for finding and loading modules
in a given namespace, inspired by C<Mojo::Loader>.
=head1 ACKNOWLEDGEMENTS
Thanks to Jonas B. Nielsen for making explicit imports work.
=head1 BUG REPORTS
Please report bugs or other issues to E<lt>bug-module-load@rt.cpan.orgE<gt>.
=head1 AUTHOR
This module by Jos Boumans E<lt>kane@cpan.orgE<gt>.
=head1 COPYRIGHT
This library is free software; you may redistribute and/or modify it
under the same terms as Perl itself.
=cut