code: function createSelectorList() {
          var doc = DocumentManager.getCurrentDocument();
          if (!doc) {
              return;
          }
  
          var docText = doc.getText();
          return CSSUtils.extractAllSelectors(docText, doc.getLanguage().getMode());
      }
docs: Returns a list of information about selectors for a single document. This array is populated
  by createSelectorList()
  @return {?Array.<FileLocation>}