package EvalScalar;
use Carp;

sub import {
    my $caller_pkg = caller;
    my $my_pkg     = shift;

    for (@_) {
        my $var = $_;
        $var =~ s/^\$//;
        my $temp;
        tie $temp, $my_pkg;
        *{$caller_pkg . '::' . $var} = \$temp;
    }
}

sub unimport {
    my $caller_pkg = caller;
    my $my_pkg     = shift;

    for (@_) {
        my $var = $_;
        $var =~ s/^\$//;
        my $temp;
        my $old_var = *{$caller_pkg . '::' . $var}{SCALAR};
        *{$caller_pkg . '::' . $var} = \$temp;
        untie $$old_var;
    }
}

sub TIESCALAR {
    my $pkg  = shift;
    my $type = shift;

    my $temp = '';
    my $self = \$temp;
    bless $self, $pkg;
    return $self;
}

sub STORE {
    my $self  = shift;
    my $value = shift;

    $value =~ s/\$(\w+)(?!::)/'$' . caller() . '::' . $1/ge;
    $$self = $value;
}

sub FETCH {
    my $self = shift;
    my $value = eval $$self;
    if ($@) {
        carp $@;
        return '';
    }
    else {
        return $value;
    }
}

1;