Inheritance: extends PHPParser_NodeVisitorAbstract
 public function legacyConfigParser()
 {
     if (file_exists($this->getLegacyConfigPath())) {
         $parser = new \PHPParser_Parser(new \PHPParser_Lexer());
         $traverser = new \PHPParser_NodeTraverser();
         $traverser->addVisitor(new LegacyConfigVisitor());
         $statements = $parser->parse(file_get_contents($this->getLegacyConfigPath()));
         $traverser->traverse($statements);
         return LegacyConfigVisitor::getConfigValues();
     }
     return array();
 }