Standardnotes RTL Support and more.js

// ==UserScript==
// @name         Standardnotes RTL Support
// @namespace    https://ilola.ir
// @version      1.1
// @description  Change directions of Arabic and Persian lines.
// @author       Eman Amini
// @match        https://app.standardnotes.org/
// @grant        none
// ==/UserScript==
var css = ".rtl {direction: rtl;} strong, b {font-weight: 900;} #note-text-editor {font-family: IRANSansWebNoEn, DroidSans, sans-serif !important; text-align: justify;}",
    head = document.head || document.getElementByTagName("head")[0],
    style = document.createElement("style");
style.type = "text/css";
if (style.styleSheet) {
    style.stylesheet.cssText = css;
} else {
    style.appendChild(document.createTextNode(css));
}
head.appendChild(style);

function checkRtl(character) {
    var RTL = new RegExp('[آ-ی]', 'g');
    if (RTL.test(character)) {
        return true;
    } else {
        return false;
    }
}

function checkLtr(character) {
    var LTR = new RegExp('[a-zA-Z]', 'g');
    if (LTR.test(character)) {
        return true;
    } else {
        return false;
    }
}

function init() {
    //Check existed text and RTL it if it's needed
    y = document.getElementById("note-text-editor").value;
    eVal(y, 0, "note-text-editor");

    //Check Text on real time
    document.getElementById("note-text-editor").onkeyup = function() {
        eVal(document.getElementById("note-text-editor").value, 1, "note-text-editor");
    };

    //Check existed title and RTL it if it's needed
    x = document.getElementById("note-title-editor").value;
    eVal(x, 0, "note-title-editor");

    //Check Title on real time
    document.getElementById("note-title-editor").onkeyup = function() {
        eVal(document.getElementById("note-title-editor").value, 0, "note-title-editor");
    };

}

function eVal(x, counter, id) {
    var fa = 0;
    var en = 0;
    if ((counter === 0) || (x.length < 100) || (x.length < 500 && x % 5 === 0) || (x.length % 20 === 0)) {
        for (var i = 0; i < x.length; i++) {
            var eachchar = x[i];
            if (checkRtl(eachchar)) {
                fa = fa + 1;
            } else if (checkLtr(eachchar)) {
                en = en + 1;
            }
        }
        if (fa > en) {
            document.getElementById(id).classList.remove("rtl");
            document.getElementById(id).classList.add("rtl");
        } else {
            document.getElementById(id).classList.remove("rtl");
        }
    }
}
setTimeout(init, 2000);