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root |
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package vars; |
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use 5.006; |
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our $VERSION = '1.01'; |
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use warnings::register; |
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use strict qw(vars subs); |
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sub import { |
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my $callpack = caller; |
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my ($pack, @imports) = @_; |
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my ($sym, $ch); |
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foreach (@imports) { |
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if (($ch, $sym) = /^([\$\@\%\*\&])(.+)/) { |
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if ($sym =~ /\W/) { |
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# time for a more-detailed check-up |
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if ($sym =~ /^\w+[[{].*[]}]$/) { |
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require Carp; |
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Carp::croak("Can't declare individual elements of hash or array"); |
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} elsif (warnings::enabled() and length($sym) == 1 and $sym !~ tr/a-zA-Z//) { |
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warnings::warn("No need to declare built-in vars"); |
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} elsif (($^H &= strict::bits('vars'))) { |
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require Carp; |
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Carp::croak("'$_' is not a valid variable name under strict vars"); |
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} |
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} |
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$sym = "${callpack}::$sym" unless $sym =~ /::/; |
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*$sym = |
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( $ch eq "\$" ? \$$sym |
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: $ch eq "\@" ? \@$sym |
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: $ch eq "\%" ? \%$sym |
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: $ch eq "\*" ? \*$sym |
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: $ch eq "\&" ? \&$sym |
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: do { |
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require Carp; |
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Carp::croak("'$_' is not a valid variable name"); |
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}); |
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} else { |
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require Carp; |
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Carp::croak("'$_' is not a valid variable name"); |
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} |
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} |
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}; |
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1; |
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__END__ |
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=head1 NAME |
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vars - Perl pragma to predeclare global variable names (obsolete) |
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=head1 SYNOPSIS |
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use vars qw($frob @mung %seen); |
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=head1 DESCRIPTION |
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NOTE: For variables in the current package, the functionality provided |
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by this pragma has been superseded by C<our> declarations, available |
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in Perl v5.6.0 or later. See L<perlfunc/our>. |
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This will predeclare all the variables whose names are |
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in the list, allowing you to use them under "use strict", and |
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disabling any typo warnings. |
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Unlike pragmas that affect the C<$^H> hints variable, the C<use vars> and |
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C<use subs> declarations are not BLOCK-scoped. They are thus effective |
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for the entire file in which they appear. You may not rescind such |
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declarations with C<no vars> or C<no subs>. |
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Packages such as the B<AutoLoader> and B<SelfLoader> that delay |
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loading of subroutines within packages can create problems with |
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package lexicals defined using C<my()>. While the B<vars> pragma |
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cannot duplicate the effect of package lexicals (total transparency |
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outside of the package), it can act as an acceptable substitute by |
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pre-declaring global symbols, ensuring their availability to the |
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later-loaded routines. |
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See L<perlmodlib/Pragmatic Modules>. |
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=cut |
