function addRule($indent, $lines, &$out)
{
$rule = new Rule($this, $lines);
$this->rules[$rule->name] = $rule;
$out[] = $indent . '/* ' . $rule->name . ':' . $rule->rule . ' */' . PHP_EOL;
$out[] = $rule->compile($indent);
$out[] = PHP_EOL;
}