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- package vars;
-
- require 5.002;
-
- # 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
- # if Carp hasn't been loaded in earlier compile time. :-(
- # We'll let those bugs get found on the development track.
- require Carp if $] < 5.00450;
-
- sub import {
- my $callpack = caller;
- my ($pack, @imports, $sym, $ch) = @_;
- foreach $sym (@imports) {
- ($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+[[{].*[]}]$/) {
- require Carp;
- Carp::croak("Can't declare individual elements of hash or array");
- } elsif ($^W and length($sym) == 1 and $sym !~ tr/a-zA-Z//) {
- require Carp;
- Carp::carp("No need to declare built-in vars");
- }
- }
- *{"${callpack}::$sym"} =
- ( $ch eq "\$" ? \$ {"${callpack}::$sym"}
- : $ch eq "\@" ? \@ {"${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");
- });
- }
- };
-
- 1;
-