text: (function () {
    if (typeof self === 'undefined' || !self.Prism || !self.document || !document.querySelector) {
      return;
    }
    
    Prism.plugins.toolbar.registerButton('download-file', function (env) {
      var pre = env.element.parentNode;
      if (!pre || !/pre/i.test(pre.nodeName) || !pre.hasAttribute('data-src') || !pre.hasAttribute('data-download-link')) {
        return;
      }
      var src = pre.getAttribute('data-src');
      var a = document.createElement('a');
      a.textContent = pre.getAttribute('data-download-link-label') || 'Download';
      a.setAttribute('download', '');
      a.href = src;
      return a;
    });
    
  })();
  