mirror of
https://git.savannah.gnu.org/git/parallel.git
synced 2024-11-23 06:27:55 +00:00
83 lines
2.3 KiB
Perl
83 lines
2.3 KiB
Perl
|
package vars;
|
||
|
|
||
|
use 5.006;
|
||
|
|
||
|
our $VERSION = '1.02';
|
||
|
|
||
|
use warnings::register;
|
||
|
use strict qw(vars subs);
|
||
|
|
||
|
sub import {
|
||
|
my $callpack = caller;
|
||
|
my (undef, @imports) = @_;
|
||
|
my ($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("'$_' is not a valid variable name");
|
||
|
});
|
||
|
} else {
|
||
|
require Carp;
|
||
|
Carp::croak("'$_' is not a valid variable name");
|
||
|
}
|
||
|
}
|
||
|
};
|
||
|
|
||
|
1;
|
||
|
__END__
|
||
|
|
||
|
=head1 NAME
|
||
|
|
||
|
vars - Perl pragma to predeclare global variable names (obsolete)
|
||
|
|
||
|
=head1 SYNOPSIS
|
||
|
|
||
|
use vars qw($frob @mung %seen);
|
||
|
|
||
|
=head1 DESCRIPTION
|
||
|
|
||
|
NOTE: For variables in the current package, the functionality provided
|
||
|
by this pragma has been superseded by C<our> declarations, available
|
||
|
in Perl v5.6.0 or later. See L<perlfunc/our>.
|
||
|
|
||
|
This will predeclare all the variables whose names are
|
||
|
in the list, allowing you to use them under "use strict", and
|
||
|
disabling any typo warnings.
|
||
|
|
||
|
Unlike pragmas that affect the C<$^H> hints variable, the C<use vars> and
|
||
|
C<use subs> declarations are not BLOCK-scoped. They are thus effective
|
||
|
for the entire file in which they appear. You may not rescind such
|
||
|
declarations with C<no vars> or C<no subs>.
|
||
|
|
||
|
Packages such as the B<AutoLoader> and B<SelfLoader> that delay
|
||
|
loading of subroutines within packages can create problems with
|
||
|
package lexicals defined using C<my()>. While the B<vars> pragma
|
||
|
cannot duplicate the effect of package lexicals (total transparency
|
||
|
outside of the package), it can act as an acceptable substitute by
|
||
|
pre-declaring global symbols, ensuring their availability to the
|
||
|
later-loaded routines.
|
||
|
|
||
|
See L<perlmodlib/Pragmatic Modules>.
|
||
|
|
||
|
=cut
|