Duolingo input language switcher

This script allows you to type letters appropriate for current task without changing keyboard's layout

As of 2019-12-04. See the latest version.

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name Duolingo input language switcher
// @namespace https://www.duolingo.com/IVrL9
// @author T1mL3arn
// @match https://www.duolingo.com/*
// @version 2.0.1
// @description This script allows you to type letters appropriate for current task without changing keyboard's layout
// @run-at document-start
// @grant none
// @icon https://www.androidpolice.com/wp-content/uploads/2014/03/nexusae0_Duolingo-Thumb.png
// @license GPLv3
// @homepageURL https://github.com/T1mL3arn/Duolingo-input-language-switcher
// @supportURL https://greasyfork.org/en/scripts/37693-duolingo-input-language-switcher/feedback
// ==/UserScript==/// Generated by Haxe 4.0.3
(function ($global) { "use strict";
var Main = function() {
	this.document = window.document;
	this.console = window.console;
	this.initLanguages();
	if(this.document.readyState == "interactive" || this.document.readyState == "complete") {
		this.onready();
	} else {
		this.document.addEventListener("DOMContentLoaded",$bind(this,this.onready));
	}
};
Main.main = function() {
	new Main();
};
Main.prototype = {
	initLanguages: function() {
		this.keyCodes = ["Backquote","Digit1","Digit2","Digit3","Digit4","Digit5","Digit6","Digit7","Digit8","Digit9","Digit0","Minus","Equal","Backslash","KeyQ","KeyW","KeyE","KeyR","KeyT","KeyY","KeyU","KeyI","KeyO","KeyP","BracketLeft","BracketRight","KeyA","KeyS","KeyD","KeyF","KeyG","KeyH","KeyJ","KeyK","KeyL","Semicolon","Quote","KeyZ","KeyX","KeyC","KeyV","KeyB","KeyN","KeyM","Comma","Period","Slash"];
		this.languages = { };
		this.languages.ru = "ё1234567890-=\\йцукенгшщзхъфывапролджэячсмитьбю.Ё!\"№;%:?*()_+/ЙЦУКЕНГШЩЗХЪФЫВАПРОЛДЖЭЯЧСМИТЬБЮ,";
		this.languages.en = "`1234567890-=\\qwertyuiop[]asdfghjkl;'zxcvbnm,./~!@#$%^&*()_+|QWERTYUIOP{}ASDFGHJKL:\"ZXCVBNM<>?";
		var len = this.languages.ru.length;
		var _g = 0;
		var _g1 = Reflect.fields(this.languages);
		while(_g < _g1.length) {
			var f = _g1[_g];
			++_g;
			var act = this.languages[f].length;
			if(act != len) {
				this.console.error("LangString test failed: expected len " + len + "; actual len " + act + "; lang name " + f);
				this.console.error(this.languages[f]);
				return;
			}
			if(act != this.keyCodes.length * 2) {
				this.console.error("KeyCodes and LangString test failed: expected lang string len " + this.keyCodes.length * 2 + "; actual len " + act + "; lang name " + f);
				return;
			}
		}
	}
	,onready: function(e) {
		this.document.removeEventListener("DOMContentLoaded",$bind(this,this.onready));
		this.console.log("Duolingo input switcher is ready");
		window.document.body.addEventListener("keydown",$bind(this,this.onKeyDown));
	}
	,onKeyDown: function(e) {
		if(e.ctrlKey) {
			return;
		}
		var pressedKeyCodeIndex = this.keyCodes.indexOf(e.code);
		if(pressedKeyCodeIndex == -1) {
			return;
		}
		var inputElt = e.target;
		switch(inputElt.dataset.test) {
		case "challenge-listen-input":case "challenge-listentap-input":case "challenge-name-input":
			this.setLanguagePair("en","ru");
			break;
		case "challenge-text-input":
			this.setLanguagePair("en","ru");
			break;
		case "challenge-translate-input":
			this.nativeLanguage = "ru";
			this.foreignLanguage = "en";
			var lang = inputElt.getAttribute("lang");
			if(lang == this.nativeLanguage) {
				this.setLanguagePair("ru","en");
			} else if(lang == this.foreignLanguage) {
				this.setLanguagePair("en","ru");
			}
			break;
		default:
			return;
		}
		e.preventDefault();
		var newLetter = this.getLanguageLetter(this.targetLanguage,pressedKeyCodeIndex,e.shiftKey);
		this.replaceLetter(inputElt.selectionStart,newLetter,inputElt);
		this.callReactOnChange(inputElt);
	}
	,setLanguagePair: function(target,source) {
		this.targetLanguage = target;
		this.sourceLanguage = source;
	}
	,getLanguageLetter: function(language,letterIndex,isUppercase) {
		var letters = this.languages[language];
		if(isUppercase) {
			return letters.charAt(letterIndex + this.keyCodes.length);
		} else {
			return letters.charAt(letterIndex);
		}
	}
	,replaceLetter: function(index,letter,inputElt) {
		var phrase = inputElt.value;
		phrase = phrase.substring(0,index) + letter + phrase.substring(index);
		inputElt.value = phrase;
		inputElt.setSelectionRange(index + 1,index + 1);
	}
	,callReactOnChange: function(elt) {
		var _g = 0;
		var _g1 = Reflect.fields(elt);
		while(_g < _g1.length) {
			var fieldName = _g1[_g];
			++_g;
			if(fieldName.indexOf("__reactEventHandlers") != -1) {
				Reflect.field(elt,fieldName).onChange({ target : elt});
			}
		}
	}
};
var Reflect = function() { };
Reflect.field = function(o,field) {
	try {
		return o[field];
	} catch( e ) {
		return null;
	}
};
Reflect.fields = function(o) {
	var a = [];
	if(o != null) {
		var hasOwnProperty = Object.prototype.hasOwnProperty;
		for( var f in o ) {
		if(f != "__id__" && f != "hx__closures__" && hasOwnProperty.call(o,f)) {
			a.push(f);
		}
		}
	}
	return a;
};
var $_;
function $bind(o,m) { if( m == null ) return null; if( m.__id__ == null ) m.__id__ = $global.$haxeUID++; var f; if( o.hx__closures__ == null ) o.hx__closures__ = {}; else f = o.hx__closures__[m.__id__]; if( f == null ) { f = m.bind(o); o.hx__closures__[m.__id__] = f; } return f; }
$global.$haxeUID |= 0;
Main.main();
})(typeof window != "undefined" ? window : typeof global != "undefined" ? global : typeof self != "undefined" ? self : this);