my $now = time;
my $filter = AND(
    "(objectClass=dynCand)",
    "(candActive=TRUE)",
    "(dynActive=TRUE)",
    OR(
        NOT(
            "(candBase=EXTERNAL)"
        ),
        AND(
            "(candBase=EXTERNAL)",
            NOT(
                OR(
                    "(dynProfile=ante)",
                    "(dynProfile=catp)",
                    "(dynProfile=fci)",
                    "(dynProfile=mgn)",
                    "(dynProfile=oppse)",
                    "(dynProfile=pic)",
                    "(dynProfile=ren)",
                )
            )
        )
    ),
    "(candDateStart<=$now)",
    "(candDateEnd>=$now)",
    "(dynDateStart<=$now)",
    "(dynDateEnd>=$now)",
);

##</code><code>##

sub AND {
    return _joiner( '&', @_ );
}

sub OR {
    return _joiner( '|', @_ );
}

sub _joiner {
    my $op = shift;
    my $filter = shift;
    while (my $cond = shift) {
        $filter = "($op $filter $cond)" if defined $cond;
    }
    return $filter;
}

sub NOT {
    return "(!$_[0])";
}

sub IGNORE {
    return;
}