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File autouse.pm

package autouse;

#use strict;		# debugging only
use 5.006;		# use warnings

$autouse::VERSION = '1.11';

$autouse::DEBUG ||= 0;

sub vet_import ($);

sub croak {
    require Carp;
    Carp::croak(@_);
}

sub import {
    my $class = @_ ? shift : 'autouse';
    croak "usage: use $class MODULE [,SUBS...]" unless @_;
    my $module = shift;

(my $pm = $module) =~ s{::}{/}g;
    $pm .= '.pm';
    if (exists $INC{$pm}) {
	vet_import $module;
	local $Exporter::ExportLevel = $Exporter::ExportLevel + 1;
	# $Exporter::Verbose = 1;
	return $module->import(map { (my $f = $_) =~ s/$.*?$$//; $f } @_);
    }

# It is not loaded: need to do real work.
    my $callpkg = caller(0);
    print "autouse called from $callpkg\n" if $autouse::DEBUG;

my $index;
    for my $f (@_) {
	my $proto;
	$proto = $1 if (my $func = $f) =~ s/$(.*)$$//;

my $closure_import_func = $func;	# Full name
	my $closure_func = $func;		# Name inside package
	my $index = rindex($func, '::');
	if ($index == -1) {
	    $closure_import_func = "${callpkg}::$func";
	} else {
	    $closure_func = substr $func, $index + 2;
	    croak "autouse into different package attempted"
		unless substr($func, 0, $index) eq $module;
	}

my $load_sub = sub {
	    unless ($INC{$pm}) {
		require $pm;
		vet_import $module;
	    }
            no warnings qw(redefine prototype);
	    *$closure_import_func = \&{"${module}::$closure_func"};
	    print "autousing $module; "
		  ."imported $closure_func as $closure_import_func\n"
		if $autouse::DEBUG;
	    goto &$closure_import_func;
	};

if (defined $proto) {
	    *$closure_import_func = eval "sub ($proto) { goto &\$load_sub }"
	        || die;
	} else {
	    *$closure_import_func = $load_sub;
	}
    }
}

sub vet_import ($) {
    my $module = shift;
    if (my $import = $module->can('import')) {
	croak "autoused module $module has unique import() method"
	    unless defined(&Exporter::import)
		   && ($import == \&Exporter::import ||
		       $import == \&UNIVERSAL::import)
    }
}

__END__

=head1 NAME

autouse - postpone load of modules until a function is used

=head1 SYNOPSIS

use autouse 'Carp' => qw(carp croak);
  carp "this carp was predeclared and autoused ";

=head1 DESCRIPTION

If the module C<Module> is already loaded, then the declaration

use autouse 'Module' => qw(func1 func2($;$));

is equivalent to

use Module qw(func1 func2);

if C<Module> defines func2() with prototype C<($;$)>, and func1() has
no prototypes.  (At least if C<Module> uses C<Exporter>'s C<import>,
otherwise it is a fatal error.)

If the module C<Module> is not loaded yet, then the above declaration
declares functions func1() and func2() in the current package.  When
these functions are called, they load the package C<Module> if needed,
and substitute themselves with the correct definitions.

=begin _deprecated

use Module qw(Module::func3);

will work and is the equivalent to:

use Module qw(func3);

It is not a very useful feature and has been deprecated.

=end _deprecated

=head1 WARNING

Using C<autouse> will move important steps of your program's execution
from compile time to runtime.  This can

=over 4

=item *

Break the execution of your program if the module you C<autouse>d has
some initialization which it expects to be done early.

=item *

hide bugs in your code since important checks (like correctness of
prototypes) is moved from compile time to runtime.  In particular, if
the prototype you specified on C<autouse> line is wrong, you will not
find it out until the corresponding function is executed.  This will be
very unfortunate for functions which are not always called (note that
for such functions C<autouse>ing gives biggest win, for a workaround
see below).

=back

To alleviate the second problem (partially) it is advised to write
your scripts like this:

use Module;
  use autouse Module => qw(carp($) croak(&$));
  carp "this carp was predeclared and autoused ";

The first line ensures that the errors in your argument specification
are found early.  When you ship your application you should comment
out the first line, since it makes the second one useless.

=head1 AUTHOR

Ilya Zakharevich (ilya@math.ohio-state.edu)

=head1 SEE ALSO

perl(1).

=cut

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
Attribute	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
B	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
CPAN	DIR	-	drwxr-xr-x	2024-03-13 04:56:46
Class	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Compress	DIR	-	drwxr-xr-x	2024-03-13 04:36:57
Config	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
DBM_Filter	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Devel	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
ExtUtils	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
File	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Getopt	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
I18N	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IO	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IPC	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Locale	DIR	-	drwxr-xr-x	2025-07-28 08:08:32
Math	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Memoize	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Module	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Net	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Search	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Term	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Text	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Thread	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Tie	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Time	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
URI	DIR	-	drwxr-xr-x	2024-03-13 04:36:40
Unicode	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
User	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
encoding	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
overload	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
unicore	DIR	-	drwxr-xr-x	2025-07-29 10:57:24
vendor_perl	DIR	-	drwxr-xr-x	2025-07-28 08:07:18
warnings	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
AnyDBM_File.pm	text/plain	2.56 KB	-rw-r--r--	2025-07-28 08:07:09
AutoLoader.pm	text/plain	15.43 KB	-rw-r--r--	2025-07-28 08:07:09
AutoSplit.pm	text/plain	19.18 KB	-rw-r--r--	2025-07-28 08:07:09
Benchmark.pm	text/plain	30.3 KB	-rw-r--r--	2025-07-28 08:07:09
CORE.pod	text/plain	3.11 KB	-rw-r--r--	2025-07-28 08:07:09
DB.pm	text/plain	18.48 KB	-rw-r--r--	2025-07-28 08:07:09
DBM_Filter.pm	text/plain	14.05 KB	-rw-r--r--	2025-07-28 08:07:09
DirHandle.pm	text/plain	1.52 KB	-rw-r--r--	2025-07-28 08:07:09
Dumpvalue.pm	text/plain	17.14 KB	-rw-r--r--	2025-07-28 08:07:09
English.pm	text/plain	4.65 KB	-rw-r--r--	2025-07-28 08:07:09
FileCache.pm	text/plain	5.44 KB	-rw-r--r--	2025-07-28 08:07:09
FileHandle.pm	text/plain	6.63 KB	-rw-r--r--	2025-07-28 08:07:09
FindBin.pm	text/plain	4.45 KB	-rw-r--r--	2025-07-28 08:07:09
Internals.pod	text/plain	2.52 KB	-rw-r--r--	2025-07-28 08:07:09
Memoize.pm	text/plain	35.34 KB	-rw-r--r--	2025-07-28 08:08:32
NEXT.pm	text/plain	18.4 KB	-rw-r--r--	2025-07-28 08:07:09
PerlIO.pm	text/plain	10.21 KB	-rw-r--r--	2025-07-28 08:07:09
Safe.pm	text/plain	24.49 KB	-rw-r--r--	2025-07-28 08:07:09
SelectSaver.pm	text/plain	1.05 KB	-rw-r--r--	2025-07-28 08:07:09
SelfLoader.pm	text/plain	17.28 KB	-rw-r--r--	2025-07-28 08:08:32
Symbol.pm	text/plain	4.69 KB	-rw-r--r--	2025-07-28 08:07:09
Test.pm	text/plain	29.35 KB	-rw-r--r--	2025-07-28 08:08:32
Thread.pm	text/plain	8.09 KB	-rw-r--r--	2025-07-28 08:07:09
UNIVERSAL.pm	text/plain	6.44 KB	-rw-r--r--	2025-07-28 08:07:09
URI.pm	text/plain	33.97 KB	-rw-r--r--	2018-01-09 06:42:55
XSLoader.pm	text/plain	11 KB	-rw-r--r--	2025-07-28 08:07:09
_charnames.pm	text/plain	32.39 KB	-rw-r--r--	2025-07-28 08:07:09
autouse.pm	text/plain	4.14 KB	-rw-r--r--	2025-07-28 08:07:09
base.pm	text/plain	10.72 KB	-rw-r--r--	2025-07-28 08:07:09
blib.pm	text/plain	2.04 KB	-rw-r--r--	2025-07-28 08:07:09
bytes.pm	text/plain	3.67 KB	-rw-r--r--	2025-07-28 08:07:09
bytes_heavy.pl	text/plain	758 B	-rw-r--r--	2025-07-28 08:07:09
charnames.pm	text/plain	20.38 KB	-rw-r--r--	2025-07-28 08:07:09
deprecate.pm	text/plain	3.01 KB	-rw-r--r--	2025-07-28 08:07:09
diagnostics.pm	text/plain	18.59 KB	-rw-r--r--	2025-07-28 08:07:09
dumpvar.pl	text/plain	15.19 KB	-rw-r--r--	2025-07-28 08:07:09
feature.pm	text/plain	16.68 KB	-rw-r--r--	2025-07-28 08:07:09
fields.pm	text/plain	9.27 KB	-rw-r--r--	2025-07-28 08:07:09
filetest.pm	text/plain	3.91 KB	-rw-r--r--	2025-07-28 08:07:09
if.pm	text/plain	3.26 KB	-rw-r--r--	2025-07-28 08:07:09
integer.pm	text/plain	3.18 KB	-rw-r--r--	2025-07-28 08:07:09
less.pm	text/plain	3.13 KB	-rw-r--r--	2025-07-28 08:07:09
locale.pm	text/plain	4.74 KB	-rw-r--r--	2025-07-28 08:07:09
meta_notation.pm	text/plain	2.07 KB	-rw-r--r--	2025-07-28 08:07:09
open.pm	text/plain	7.83 KB	-rw-r--r--	2025-07-28 08:08:32
overload.pm	text/plain	52.06 KB	-rw-r--r--	2025-07-28 08:07:09
overloading.pm	text/plain	1.77 KB	-rw-r--r--	2025-07-28 08:07:09
perl5db.pl	text/plain	309 KB	-rw-r--r--	2025-07-28 08:07:09
sigtrap.pm	text/plain	7.43 KB	-rw-r--r--	2025-07-28 08:07:09
sort.pm	text/plain	5.94 KB	-rw-r--r--	2025-07-28 08:07:09
strict.pm	text/plain	4.63 KB	-rw-r--r--	2025-07-28 08:07:09
subs.pm	text/plain	848 B	-rw-r--r--	2025-07-28 08:07:09
utf8.pm	text/plain	8.9 KB	-rw-r--r--	2025-07-28 08:07:09
utf8_heavy.pl	text/plain	30.87 KB	-rw-r--r--	2025-07-28 08:07:09
vars.pm	text/plain	2.36 KB	-rw-r--r--	2025-07-28 08:07:09
vmsish.pm	text/plain	4.21 KB	-rw-r--r--	2025-07-28 08:07:09
warnings.pm	text/plain	43.71 KB	-rw-r--r--	2025-07-28 08:07:09

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