/**
* JSONfn - javascript (both node.js and browser) plugin to stringify,
*          parse and clone objects with Functions, Regexp and Date.
*
* Version - 1.1.0
* Copyright (c) Vadim Kiryukhin
* vkiryukhin @ gmail.com
* http://www.eslinstructor.net/jsonfn/
*
* Licensed under the MIT license ( http://www.opensource.org/licenses/mit-license.php )
*
*   USAGE:
*     browser:
*         JSONfn.stringify(obj);
*         JSONfn.parse(str[, date2obj]);
*         JSONfn.clone(obj[, date2obj]);
*
*     nodejs:
*       var JSONfn = require('path/to/json-fn');
*       JSONfn.stringify(obj);
*       JSONfn.parse(str[, date2obj]);
*       JSONfn.clone(obj[, date2obj]);
*
*
*     @obj      -  Object;
*     @str      -  String, which is returned by JSONfn.stringify() function;
*     @date2obj - Boolean (optional); if true, date string in ISO8061 format
*                 is converted into a Date object; otherwise, it is left as a String.
*/

(function (exports) {
"use strict";

  exports.stringify = function (obj) {

    return JSON.stringify(obj, function (key, value) {
      var fnBody;
      if (value instanceof Function || typeof value == 'function') {


        fnBody = value.toString();

        if (fnBody.length < 8 || fnBody.substring(0, 8) !== 'function') { //this is ES6 Arrow Function
          return '_NuFrRa_' + fnBody;
        }
        return fnBody;
      }
      if (value instanceof RegExp) {
        return '_PxEgEr_' + value;
      }
      return value;
    });
  };

  exports.parse = function (str, date2obj) {

    var iso8061 = date2obj ? /^(\d{4})-(\d{2})-(\d{2})T(\d{2}):(\d{2}):(\d{2}(?:\.\d*)?)Z$/ : false;

    return JSON.parse(str, function (key, value) {
      var prefix;

      if (typeof value != 'string') {
        return value;
      }
      if (value.length < 8) {
        return value;
      }

      prefix = value.substring(0, 8);

      if (iso8061 && value.match(iso8061)) {
        return new Date(value);
      }
      if (prefix === 'function') {
        return eval('(' + value + ')');
      }
      if (prefix === '_PxEgEr_') {
        return eval(value.slice(8));
      }
      if (prefix === '_NuFrRa_') {
        return eval(value.slice(8));
      }

      return value;
    });
  };

  exports.clone = function (obj, date2obj) {
    return exports.parse(exports.stringify(obj), date2obj);
  };

}(typeof exports === 'undefined' ? (window.JSONfn = {}) : exports));

function fl_slugify($attribute) {

    let string = encodeURIComponent($attribute.toString().toLowerCase().trim().replace(/["',]/g, "").replace(/\s/g, '-')).toLowerCase();

    const a = 'àáâäæãåāăąçćčđďèéêëēėęěğǵḧîïíīįìłḿñńǹňôöòóœøōõṕŕřßśšşșťțûüùúūǘůűųẃẍÿýžźż·/,:;'
    const b = 'aaaaaaaaaacccddeeeeeeeegghiiiiiilmnnnnooooooooprrsssssttuuuuuuuuuwxyyzzz-----'
    const p = new RegExp(a.split('').join('|'), 'g')

    return string.toString().toLowerCase()
        .replace(/\.+/g, '-') // Replace . with
        .replace(/\:+/g, '') // Replace : with blank space
        .replace(/\s+/g, '-') // Replace spaces with -
        .replace(p, c => b.charAt(a.indexOf(c))) // Replace special characters
        .replace(/&/g, '-and-') // Replace & with 'and'
        .replace(/[^\w\-]+/g, '') // Remove all non-word characters
        .replace(/\-\-+/g, '-') // Replace multiple - with single -
        .replace(/^-+/, '') // Trim - from start of text
        .replace(/-+$/, '') // Trim - from end of text
}