diff options
Diffstat (limited to 'lib/vars.pm')
| -rw-r--r-- | lib/vars.pm | 55 |
1 files changed, 34 insertions, 21 deletions
diff --git a/lib/vars.pm b/lib/vars.pm index e007baa7b9..5723ac6c2c 100644 --- a/lib/vars.pm +++ b/lib/vars.pm @@ -1,5 +1,39 @@ 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 $sym (@imports) { + if ($sym =~ /::/) { + require Carp; + Carp::croak("Can't declare another package's variables"); + } + ($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"); + }); + } +}; + +1; +__END__ + =head1 NAME vars - Perl pragma to predeclare global variable names @@ -30,24 +64,3 @@ later-loaded routines. See L<perlmod/Pragmatic Modules>. =cut - -require 5.002; -use Carp; - -sub import { - my $callpack = caller; - my ($pack, @imports, $sym, $ch) = @_; - foreach $sym (@imports) { - croak "Can't declare another package's variables" if $sym =~ /::/; - ($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}::$sym"} - : croak "'$ch$sym' is not a valid variable name\n"); - } -}; - -1; |