private function _isAttrSelector($node)
    {
        $ret = false;

        if ($this->_op == CssParserFilterAttr::EQUAL_SELECTOR) {
            $ret = $this->_isEqualSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::NOT_EQUAL_SELECTOR) {
            $ret = $this->_isNotEqualSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::CONTAIN_SELECTOR) {
            $ret = $this->_isContainSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::CONTAIN_WORD_SELECTOR) {
            $ret = $this->_isContainWordSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::CONTAIN_PREFIX_SELECTOR) {
            $ret = $this->_isContainPrefixSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::START_WITH_SELECTOR) {
            $ret = $this->_isStartWithSelector($node);
        } elseif ($this->_op == CssParserFilterAttr::END_WITH_SELECTOR) {
            $ret = $this->_isEndWithSelector($node);
        } else {
            $ret = $this->_hasAttribute($node);
        }

        return $ret;
    }