short-uid/lib/short-uid.js

Length Efficient Unique ID Generator

// Generated by CoffeeScript 1.8.0

/*
  Short Unique Id Generator
 */

(function() {
  var ShortUID;

  ShortUID = (function() {
    var DEFAULT_RANDOM_ID_LEN, DICT_RANGES, dict, dictIndex, dictLength, dictRange, lowerBound, rangeType, upperBound, _i;

    DEFAULT_RANDOM_ID_LEN = 6;

    DICT_RANGES = {
      digits: [48, 58],
      lowerCase: [97, 123],
      upperCase: [65, 91]
    };

    dict = [];

    for (rangeType in DICT_RANGES) {
      dictRange = DICT_RANGES[rangeType];
      lowerBound = dictRange[0], upperBound = dictRange[1];
      for (dictIndex = _i = lowerBound; lowerBound <= upperBound ? _i < upperBound : _i > upperBound; dictIndex = lowerBound <= upperBound ? ++_i : --_i) {
        dict.push(String.fromCharCode(dictIndex));
      }
    }

    dict = dict.sort(function(a, b) {
      return Math.random() <= 0.5;
    });

    dictLength = dict.length;

    function ShortUID(options) {
      if (options == null) {
        options = {};
      }
      this.counter = 0;
      this.debug = options.debug;
      this.log("Generator created with Dictionary Size " + dictLength);
    }

    ShortUID.prototype.log = function() {
      var _ref;
      arguments[0] = "[frugal-id] " + arguments[0];
      if (this.debug === true) {
        return typeof console !== "undefined" && console !== null ? (_ref = console.log) != null ? _ref.apply(console, arguments) : void 0 : void 0;
      }
    };

    ShortUID.prototype.getDict = function() {
      return dict;
    };

    ShortUID.prototype.counterUUID = function() {
      var counterDiv, counterRem, id;
      id = '';
      counterDiv = this.counter;
      while (true) {
        counterRem = counterDiv % dictLength;
        counterDiv = parseInt(counterDiv / dictLength);
        id += dict[counterRem];
        if (counterDiv === 0) {
          break;
        }
      }
      this.counter++;
      return id;
    };

    ShortUID.prototype.randomUUID = function(uuidLength) {
      var id, idIndex, randomPartIdx, _j;
      if (uuidLength == null) {
        uuidLength = DEFAULT_RANDOM_ID_LEN;
      }
      if ((uuidLength == null) || uuidLength < 1) {
        throw new Error("Invalid UUID Length Provided");
      }
      id = '';
      for (idIndex = _j = 0; 0 <= uuidLength ? _j < uuidLength : _j > uuidLength; idIndex = 0 <= uuidLength ? ++_j : --_j) {
        randomPartIdx = parseInt(Math.random() * dictLength) % dictLength;
        id += dict[randomPartIdx];
      }
      return id;
    };

    return ShortUID;

  })();


  /*
    Export Module
   */

  if (typeof window !== "undefined" && window !== null) {
    window.ShortUID = ShortUID;
  } else if (typeof exports !== "undefined" && exports !== null) {
    module.exports = ShortUID;
  }

}).call(this);