EmbedJs.php

<?php

namespace shqear\widgets;

use yii\web\View;
use yii\widgets\Block;

class EmbedJs extends Block
{
    public $position = View::POS_END;
    public $key;

    /**
     * @param array|integer $config array or block position constant
     * @return void|static
     */
    static function begin($config = [])
    {
        $config = is_array($config) ? $config : ['position' => $config];
        parent::begin($config);
    }

    /**
     * @return string|void
     */
    public function run()
    {
        $block = ob_get_clean();

        $block = trim($block);

        $jsBlockPattern = '|^<script[^>]*>(?P<block_content>.+?)</script>$|is';
        if (preg_match($jsBlockPattern, $block, $matches)) {
            $block = $matches['block_content'];
        }

        $key = (empty($this->key)) ? md5($block) : $this->key;

        $this->view->registerJs($block, $this->position, $key);
    }
}