package vars;
-require 5.002;
+use 5.006;
-# 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;
+our $VERSION = '1.01';
+
+use warnings::register;
+use strict qw(vars subs);
sub import {
my $callpack = caller;
- my ($pack, @imports, $sym, $ch) = @_;
- foreach $sym (@imports) {
- if ($sym =~ /::/) {
+ my ($pack, @imports) = @_;
+ my ($sym, $ch);
+ foreach (@imports) {
+ if (($ch, $sym) = /^([\$\@\%\*\&])(.+)/) {
+ if ($sym =~ /\W/) {
+ # time for a more-detailed check-up
+ if ($sym =~ /^\w+[[{].*[]}]$/) {
+ 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'))) {
+ require Carp;
+ Carp::croak("'$_' is not a valid variable name under strict vars");
+ }
+ }
+ $sym = "${callpack}::$sym" unless $sym =~ /::/;
+ *$sym =
+ ( $ch eq "\$" ? \$$sym
+ : $ch eq "\@" ? \@$sym
+ : $ch eq "\%" ? \%$sym
+ : $ch eq "\*" ? \*$sym
+ : $ch eq "\&" ? \&$sym
+ : do {
+ require Carp;
+ Carp::croak("'$_' is not a valid variable name");
+ });
+ } else {
require Carp;
- Carp::croak("Can't declare another package's variables");
+ Carp::croak("'$_' is not a valid variable name");
}
- ($ch, $sym) = unpack('a1a*', $sym);
- *{"${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\n");
- });
}
};
=head1 NAME
-vars - Perl pragma to predeclare global variable names
+vars - Perl pragma to predeclare global variable names (obsolete)
=head1 SYNOPSIS
=head1 DESCRIPTION
+NOTE: For variables in the current package, 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+by this pragma has been superseded by C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