77 lines
2.3 KiB
Perl
77 lines
2.3 KiB
Perl
package vars;
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our $VERSION = '1.01';
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use warnings::register;
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use strict;
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no strict 'refs';
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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, $sym) = m/^([\$\@\%\*\&])(.+)/) {
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if ($sym =~ m/\W/) {
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# time for a more-detailed check-up
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if ($sym =~ m/^\w+[[{].*[]}]$/) {
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die("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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die("'$_' is not a valid variable name under strict vars");
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}
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}
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$sym = "{$callpack}::$sym" unless $sym =~ m/::/;
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*{Symbol::fetch_glob($sym)} =
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( $ch eq "\$" ? \${*{Symbol::fetch_glob($sym)}}
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: $ch eq "\@" ? \@{*{Symbol::fetch_glob($sym)}}
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: $ch eq "\%" ? \%{*{Symbol::fetch_glob($sym)}}
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: $ch eq "\*" ? \*{Symbol::fetch_glob($sym)}
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: $ch eq "\&" ? \&{*{Symbol::fetch_glob($sym)}}
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: die("'$_' is not a valid variable name")
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);
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} else {
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die("'$_' 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
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