basic-uuid/lib/index.js

Basic UUID class for generating random UUIDs

'use strict';

function _toConsumableArray(arr) { if (Array.isArray(arr)) { for (var i = 0, arr2 = Array(arr.length); i < arr.length; i++) { arr2[i] = arr[i]; } return arr2; } else { return Array.from(arr); } }

var PATTERN = /^([a-f0-9]{8})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{4})([a-f0-9]{12})$/i;

function UUID(value) {
  var __digits__ = value || createRandomDigitList();

  this.getId = function () {
    var _hex = digitListToHex(__digits__);

    return formatUUIDFromHex(_hex);
  };

  this.toJSON = function () {
    return '{"uuid":"' + this.getId() + '"}';
  };
}

function formatUUIDFromHex(hex) {
  return hex.replace(PATTERN, "$1-$2-$3-$4-$5");
}

function padLeft(value) {
  var lengthTotal = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 2;

  while (value.length < lengthTotal) {
    value = '0' + value;
  }

  return value;
}

function hexToDigitList(hex) {
  var _value = hex.match(/.{2}/g);

  return _value.map(function (digit) {
    return parseInt(digit, 16);
  });
}

function digitListToHex(list) {
  var _value = list.map(function (item) {
    return padLeft(item.toString(16));
  });

  return _value.join('');
}

function createRandomDigitList() {
  var _time = new Date().getTime();

  var _hex = padLeft(_time.toString(16).substr(-8), 8);

  var _hexList = hexToDigitList(_hex);

  return [].concat(_toConsumableArray(randomDigits(10)), _toConsumableArray(_hexList), _toConsumableArray(randomDigits(2)));
}

function randomDigits(count) {
  var _value = new Array(count).fill(null);

  return _value.map(function () {
    return Math.floor(Math.random() * 0x100);
  });
}

function isUUID(id) {
  return PATTERN.test(id.replace(/-/g, ''));
}

function randomUUID() {
  return new UUID();
}

function fromString(id) {
  if (isUUID(id)) {
    var _list = hexToDigitList(id.replace(/-/g, ''));

    return new UUID(_list);
  }

  throw new TypeError('[UUID.fromString: Invalid id: \'' + id + '\']');
}

module.exports = {

  isUUID: isUUID,

  randomUUID: randomUUID,

  fromString: fromString

};