raoul2000\workflow\source\file\WorkflowDefinitionLoader::init PHP Метод

    public function init()
    {
        parent::init();
        if ($this->parser === null) {
            $this->_p = Yii::createObject(['class' => DefaultArrayParser::className()]);
        } elseif ($this->parser === false) {
            $this->_p = null;
        } elseif (is_array($this->parser)) {
            $this->_p = Yii::createObject($this->parser);
        } elseif (is_string($this->parser)) {
            $this->_p = Yii::$app->get($this->parser);
        } elseif (is_object($this->parser)) {
            $this->_p = $this->parser;
        } else {
            throw new InvalidConfigException('invalid "parser" attribute : string or array expected');
        }
        if ($this->_p !== null && !$this->_p instanceof WorkflowArrayParser) {
            throw new InvalidConfigException('the parser component must implement the WorkflowArrayParser interface');
        }
    }