flakeid/dist/flakeid.min.js

Time based 64-bit unique id generator, inspired by Twitter id (snowflake)

(function(global,factory){typeof exports==="object"&&typeof module!=="undefined"?module.exports=factory():typeof define==="function"&&define.amd?define(factory):(global=typeof globalThis!=="undefined"?globalThis:global||self,global.FlakeId=factory())})(this,function(){"use strict";function add(x,y,base){var z=[];var n=Math.max(x.length,y.length);var carry=0;var i=0;while(i<n||carry){var xi=i<x.length?x[i]:0;var yi=i<y.length?y[i]:0;var zi=carry+xi+yi;z.push(zi%base);carry=Math.floor(zi/base);i++}return z}function multiplyByNumber(num,x,base){if(num<0){return null}if(num==0){return[]}var result=[];var power=x;while(true){if(num&1){result=add(result,power,base)}num=num>>1;if(num===0){break}power=add(power,power,base)}return result}function parseToDigitsArray(str,base){var digits=str.split("");var ary=[];for(var i=digits.length-1;i>=0;i--){var n=parseInt(digits[i],base);if(isNaN(n)){return null}ary.push(n)}return ary}function convertBase(str,fromBase,toBase){var digits=parseToDigitsArray(str,fromBase);if(digits===null){return null}var outArray=[];var power=[1];for(var i=0;i<digits.length;i++){if(digits[i]){outArray=add(outArray,multiplyByNumber(digits[i],power,toBase),toBase)}power=multiplyByNumber(fromBase,power,toBase)}var out="";for(var i=outArray.length-1;i>=0;i--){out+=outArray[i].toString(toBase)}return out}function hexToDec(hexStr){if(hexStr.substring(0,2)==="0x"){hexStr=hexStr.substring(2)}hexStr=hexStr.toLowerCase();return convertBase(hexStr,16,10)}var FlakeId=function FlakeId(options){options=options||{};this.seq=0;this.mid=(options.mid||1)%1023;this.timeOffset=options.timeOffset||0;this.lastTime=0};FlakeId.prototype.gen=function gen(){var time=Date.now();if(this.lastTime==time){this.seq++;if(this.seq>4095){this.seq=0;time=Date.now()}}else{this.seq=0}this.lastTime=time;var bTime=(time-this.timeOffset).toString(2);var bSeq=this.seq.toString(2),bMid=this.mid.toString(2);while(bSeq.length<12){bSeq="0"+bSeq}while(bMid.length<10){bMid="0"+bMid}var bid=bTime+bMid+bSeq;var id="";for(var i=bid.length;i>0;i-=4){id=parseInt(bid.substring(i-4,i),2).toString(16)+id}return hexToDec(id)};return FlakeId});