/**
 * @file Trims and replaces sequences of whitespace characters by a single space.
 * @version 3.0.0
 * @author Xotic750 <Xotic750@gmail.com>
 * @copyright  Xotic750
 * @license {@link <https://opensource.org/licenses/MIT> MIT}
 * @module normalize-space-x
 */

'use strict';

var libTrim = require('trim-x');
var trim2016 = libTrim.trim2016;
var trim2018 = libTrim.trim2018;
var Rx = require('cached-constructors-x').RegExp;
var libWhiteSpace = require('white-space-x');
var reNormalize2016 = new Rx('[' + libWhiteSpace.string2016 + ']+', 'g');
var reNormalize2018 = new Rx('[' + libWhiteSpace.string2018 + ']+', 'g');
var replace = ''.replace;

var $normalizeSpace2016 = function normalizeSpace2016(string) {
  return replace.call(trim2016(string), reNormalize2016, ' ');
};

var $normalizeSpace2018 = function normalizeSpace2018(string) {
  return replace.call(trim2018(string), reNormalize2018, ' ');
};

module.exports = {
  /**
   * Reference to normalizeSpace2018.
   */
  normalizeSpace: $normalizeSpace2018,

  /**
   * This method strips leading and trailing white-space from a string,
   * replaces sequences of whitespace characters by a single space,
   * and returns the resulting string. (ES2016)
   *
   * @param {string} string - The string to be normalized.
   * @throws {TypeError} If string is null or undefined or not coercible.
   * @returns {string} The normalized string.
   * @example
   * var normalizeSpace = require('normalize-space-x');
   *
   * normalizeSpace(' \t\na \t\nb \t\n') === 'a b'; // true
   */
  normalizeSpace2016: $normalizeSpace2016,

  /**
   * This method strips leading and trailing white-space from a string,
   * replaces sequences of whitespace characters by a single space,
   * and returns the resulting string. (ES2018)
   *
   * @param {string} string - The string to be normalized.
   * @throws {TypeError} If string is null or undefined or not coercible.
   * @returns {string} The normalized string.
   * @example
   * var normalizeSpace = require('normalize-space-x');
   *
   * normalizeSpace(' \t\na \t\nb \t\n') === 'a b'; // true
   */
  normalizeSpace2018: $normalizeSpace2018
};