require 5.002;
+our $VERSION = '1.00';
+
# The following require can't be removed during maintenance
# releases, sadly, because of the risk of buggy code that does
# require Carp; Carp::croak "..."; without brackets dying
# We'll let those bugs get found on the development track.
require Carp if $] < 5.00450;
+use warnings::register;
+require strict;
+
sub import {
my $callpack = caller;
my ($pack, @imports, $sym, $ch) = @_;
foreach $sym (@imports) {
- if ($sym =~ /::/) {
- require Carp;
- Carp::croak("Can't declare another package's variables");
- }
($ch, $sym) = unpack('a1a*', $sym);
+ if ($sym =~ tr/A-Za-z_0-9//c) {
+ # time for a more-detailed check-up
+ if ($sym =~ /::/) {
+ require Carp;
+ Carp::croak("Can't declare another package's variables");
+ } elsif ($sym =~ /^\w+[[{].*[]}]$/) {
+ require Carp;
+ Carp::croak("Can't declare individual elements of hash or array");
+ } elsif (warnings::enabled() and length($sym) == 1 and $sym !~ tr/a-zA-Z//) {
+ warnings::warn("No need to declare built-in vars");
+ } elsif ( $^H &= strict::bits('vars') ) {
+ Carp::croak("'$ch$sym' is not a valid variable name under strict vars");
+ }
+ }
*{"${callpack}::$sym"} =
( $ch eq "\$" ? \$ {"${callpack}::$sym"}
: $ch eq "\@" ? \@ {"${callpack}::$sym"}
: $ch eq "\&" ? \& {"${callpack}::$sym"}
: do {
require Carp;
- Carp::croak("'$ch$sym' is not a valid variable name\n");
+ Carp::croak("'$ch$sym' is not a valid variable name");
});
}
};
=head1 NAME
-vars - Perl pragma to predeclare global variable names
+vars - Perl pragma to predeclare global variable names (obsolete)
=head1 SYNOPSIS
=head1 DESCRIPTION
+NOTE: The functionality provided by this pragma has been superseded
+by C<our> declarations, available in Perl v5.6.0 or later. See
+L<perlfunc/our>.
+
This will predeclare all the variables whose names are
in the list, allowing you to use them under "use strict", and
disabling any typo warnings.
pre-declaring global symbols, ensuring their availability to the
later-loaded routines.
-See L<perlmod/Pragmatic Modules>.
+See L<perlmodlib/Pragmatic Modules>.
=cut