NAME¶
UNIVERSAL::require - require() modules from a variable
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¶
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 to "use" 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 to "eval 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, "require" in perlfunc,
<
http://dev.perl.org/rfc/253.pod>