nextcloud / passman-webextension

var parse_host = function(host){

    /** global: tlds */

    if(typeof tlds === "undefined"){

        throw new Error('No TLDs!');

    }

    var parts = host.split(".");

    var stack = "";

    var tld_level = 1; //unknown tld are 1st level

    for(var i=parts.length-1, part;i>=0;i--){

        part = parts[i];

        stack = stack ? part + "." + stack : part;

        if(!tlds[stack]){

            break;

        }

        tld_level = tlds[stack];

    }

    if(parts.length <= tld_level ) {

        return {

            tld: null,

            domain: host

        };

    } else {

        return  {

            tld     : parts.slice(-tld_level).join('.'),

            domain  : parts.slice(-tld_level-1).join('.'),

            sub     : parts.slice(0, (-tld_level-1)).join('.'),

        };

    }

};