text: import pathToRegexp from 'path-to-regexp';
  import { urlToList } from '../_utils/pathTools';
  
  /**
   * Recursively flatten the data
   * [{path:string},{path:string}] => {path,path2}
   * @param  menus
   */
  export const getFlatMenuKeys = menuData => {
    let keys = [];
    menuData.forEach(item => {
      keys.push(item.path);
      if (item.children) {
        keys = keys.concat(getFlatMenuKeys(item.children));
      }
    });
    return keys;
  };
  
  export const getMenuMatches = (flatMenuKeys, path) =>
    flatMenuKeys.filter(item => {
      if (item) {
        return pathToRegexp(item).test(path);
      }
      return false;
    });
  /**
   * 获得菜单子节点
   * @memberof SiderMenu
   */
  export const getDefaultCollapsedSubMenus = props => {
    const {
      location: { pathname },
      flatMenuKeys,
    } = props;
    return urlToList(pathname)
      .map(item => getMenuMatches(flatMenuKeys, item)[0])
      .filter(item => item);
  };
  