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27 Mar 2021 15:52:16 UTC
- Distribution: UNIVERSAL-require
- Module version: 0.19
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Bus factor: 1- 93.94% Coverage
- License: perl_5
- Perl: v5.6.0
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NAME
UNIVERSAL::require - require() modules from a variable [deprecated]
SYNOPSIS
# This only needs to be said once in your program. require UNIVERSAL::require; # Same as "require Some::Module" my $module = 'Some::Module'; $module->require or die $@; # Same as "use Some::Module" BEGIN { $module->use or die $@ }
DESCRIPTION
Before using this module, you should look at the alternatives, some of which are listed in SEE ALSO below.
This module provides a safe mechanism for loading a module at runtime, when you have the name of the module in a variable.
If you've ever had to do this...
eval "require $module";
to get around the bareword caveats on require(), this module is for you. It creates a universal require() class method that will work with every Perl module and its secure. So instead of doing some arcane eval() work, you can do this:
$module->require;
It doesn't save you much typing, but it'll make a lot more sense to someone who's not a ninth level Perl acolyte.
Methods
require
my $return_val = $module->require or die $@; my $return_val = $module->require($version) or die $@;
This works exactly like Perl's require, except without the bareword restriction, and it doesn't die. Since require() is placed in the UNIVERSAL namespace, it will work on any module. You just have to use UNIVERSAL::require somewhere in your code.
Should the module require fail, or not be a high enough $version, it will simply return false and not die. The error will be in $@ as well as $UNIVERSAL::require::ERROR.
$module->require or die $@;
use
my $require_return = $module->use or die $@; my $require_return = $module->use(@imports) or die $@;
Like
UNIVERSAL::require
, this allows you touse
a $module without having to eval to work around the bareword requirement. It returns the same as require.Should either the require or the import fail it will return false. The error will be in $@.
If possible, call this inside a BEGIN block to emulate a normal
use
as closely as possible.BEGIN { $module->use }
SECURITY NOTES
UNIVERSAL::require makes use of
eval STRING
. In previous versions of UNIVERSAL::require it was discovered that one could craft a class name which would result in code being executed. This hole has been closed. The only variables now exposed toeval STRING
are the caller's package, filename and line which are not tainted.UNIVERSAL::require is taint clean.
COPYRIGHT
Copyright 2001, 2005 by Michael G Schwern <schwern@pobox.com>.
This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
See http://www.perl.com/perl/misc/Artistic.html
AUTHOR
Michael G Schwern <schwern@pobox.com>
Now maintained by Neil Bowers (NEILB).
SEE ALSO
Module::Load provides functions for loading code, and importing functions. It's actively maintained.
Module::Runtime provides a number of usesful functions for require'ing and use'ing modules, and associated operations.
Mojo::Loader is a class loader and plugin framework. Module::Loader is a stand-alone module that was inspired by
Mojo::Loader
.There are many other modules that may be of interest on CPAN. An old review of some of them can be read at https://neilb.org/reviews/module-loading.html.
Module Install Instructions
To install UNIVERSAL::require, copy and paste the appropriate command in to your terminal.
cpanm UNIVERSAL::require
perl -MCPAN -e shell install UNIVERSAL::require
For more information on module installation, please visit the detailed CPAN module installation guide.