OXIESEC PANEL

Name	Size	Modified	Perms
📁 ..	-	11/12/2025 04:23:16 PM	rwxr-xr-x
📄 AnyDBM_File.pm	2.56 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 AutoLoader.pm	15.43 KB	04/03/2024 02:39:02 PM	rw-r--r--
📁 B	-	05/14/2024 03:10:02 PM	rwxr-xr-x
📄 CORE.pod	3.11 KB	04/03/2024 02:35:12 PM	rw-r--r--
📁 Class	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📁 File	-	05/14/2024 03:54:45 PM	rwxr-xr-x
📄 FileHandle.pm	6.63 KB	04/03/2024 02:39:02 PM	rw-r--r--
📁 Getopt	-	05/14/2024 03:10:02 PM	rwxr-xr-x
📁 IPC	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 Internals.pod	2.51 KB	04/03/2024 02:35:12 PM	rw-r--r--
📁 Math	-	05/14/2024 03:38:06 PM	rwxr-xr-x
📄 PerlIO.pm	14.1 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 SelectSaver.pm	1.05 KB	04/03/2024 02:39:02 PM	rw-r--r--
📄 Symbol.pm	4.69 KB	04/03/2024 02:39:02 PM	rw-r--r--
📁 Tie	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 UNIVERSAL.pm	6.44 KB	04/03/2024 02:35:12 PM	rw-r--r--
📁 URI	-	05/14/2024 12:06:27 PM	rwxr-xr-x
📄 URI.pm	34.13 KB	03/03/2021 03:16:52 PM	rw-r--r--
📄 XSLoader.pm	10.99 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 _charnames.pm	33.35 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 base.pm	10.7 KB	04/03/2024 02:39:02 PM	rw-r--r--
📄 bytes.pm	3.65 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 bytes_heavy.pl	758 bytes	04/03/2024 02:35:12 PM	rw-r--r--
📄 charnames.pm	20.44 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 feature.pm	18.56 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 if.pm	3.53 KB	04/03/2024 02:39:02 PM	rw-r--r--
📄 integer.pm	3.18 KB	04/03/2024 02:35:12 PM	rw-r--r--
📁 overload	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 overload.pm	52.05 KB	04/03/2024 02:39:02 PM	rw-r--r--
📄 overloading.pm	1.77 KB	04/03/2024 02:39:02 PM	rw-r--r--
📁 pod	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 strict.pm	4.63 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 subs.pm	901 bytes	04/03/2024 02:39:02 PM	rw-r--r--
📁 unicore	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 utf8.pm	10.18 KB	04/03/2024 02:35:12 PM	rw-r--r--
📄 vars.pm	2.4 KB	04/03/2024 02:39:02 PM	rw-r--r--
📁 vendor_perl	-	02/13/2025 09:24:57 PM	rwxr-xr-x
📁 warnings	-	05/14/2024 03:09:04 PM	rwxr-xr-x
📄 warnings.pm	49.35 KB	04/03/2024 02:35:12 PM	rw-r--r--

Editing: if.pm

package if;

$VERSION = '0.0608';

sub work {
  my $method = shift() ? 'import' : 'unimport';
  unless (@_ >= 2) {
    my $type = ($method eq 'import') ? 'use' : 'no';
    die "Too few arguments to '$type if' (some code returning an empty list in list context?)"
  }
  return unless shift;		# CONDITION

my $p = $_[0];		# PACKAGE
  (my $file = "$p.pm") =~ s!::!/!g;
  require $file;		# Works even if $_[0] is a keyword (like open)
  my $m = $p->can($method);
  goto &$m if $m;
}

sub import   { shift; unshift @_, 1; goto &work }
sub unimport { shift; unshift @_, 0; goto &work }

1;
__END__

=head1 NAME

if - C<use> a Perl module if a condition holds

=head1 SYNOPSIS

use if CONDITION, "MODULE", ARGUMENTS;
    no  if CONDITION, "MODULE", ARGUMENTS;

=head1 DESCRIPTION

=head2 C<use if>

The C<if> module is used to conditionally load another module.  The construct:

use if CONDITION, "MODULE", ARGUMENTS;

... will load C<MODULE> only if C<CONDITION> evaluates to true; it has no
effect if C<CONDITION> evaluates to false.  (The module name, assuming it
contains at least one C<::>, must be quoted when C<'use strict "subs";'> is in
effect.)  If the CONDITION does evaluate to true, then the above line has the
same effect as:

use MODULE ARGUMENTS;

For example, the F<Unicode::UCD> module's F<charinfo> function will use two functions from F<Unicode::Normalize> only if a certain condition is met:

use if defined &DynaLoader::boot_DynaLoader,
        "Unicode::Normalize" => qw(getCombinClass NFD);

Suppose you wanted C<ARGUMENTS> to be an empty list, I<i.e.>, to have the
effect of:

use MODULE ();

You can't do this with the C<if> pragma; however, you can achieve
exactly this effect, at compile time, with:

BEGIN { require MODULE if CONDITION }

=head2 C<no if>

The C<no if> construct is mainly used to deactivate categories of warnings
when those categories would produce superfluous output under specified
versions of F<perl>.

For example, the C<redundant> category of warnings was introduced in
Perl-5.22.  This warning flags certain instances of superfluous arguments to
C<printf> and C<sprintf>.  But if your code was running warnings-free on
earlier versions of F<perl> and you don't care about C<redundant> warnings in
more recent versions, you can call:

use warnings;
    no if $] >= 5.022, q|warnings|, qw(redundant);

my $test    = { fmt  => "%s", args => [ qw( x y ) ] };
    my $result  = sprintf $test->{fmt}, @{$test->{args}};

The C<no if> construct assumes that a module or pragma has correctly
implemented an C<unimport()> method -- but most modules and pragmata have not.
That explains why the C<no if> construct is of limited applicability.

=head1 BUGS

The current implementation does not allow specification of the required
version of the module.

=head1 SEE ALSO

L<Module::Requires> can be used to conditionally load one or modules,
with constraints based on the version of the module.
Unlike C<if> though, L<Module::Requires> is not a core module.

L<Module::Load::Conditional> provides a number of functions you can use to
query what modules are available, and then load one or more of them at runtime.

The L<provide> module from CPAN can be used to select one of several possible
modules to load based on the version of Perl that is running.

=head1 AUTHOR

Ilya Zakharevich L<mailto:ilyaz@cpan.org>.

=head1 COPYRIGHT AND LICENCE

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut