// ==UserScript==
// @name           [Japanese] Memrise Kana Detection
// @description    Warns whether to answer in Hiragana or Katakana on Japanese kana tests
// @author         Kai Krause <[email protected]>
// @match          http://*.memrise.com/*
// @match          https://*.memrise.com/*
// @version        1.5
// @grant          none
// @run-at         document-end
// @namespace      https://greasyfork.org/users/3656
// ==/UserScript==
var onLoad = function() {
// Get all questions and answers in the queue
var questionsAnswers = MEMRISE.garden.screens;
var getCurrentItem = function(displayedQuestion) {
for (var id in questionsAnswers) {
var expectedQuestion = questionsAnswers[id].typing.prompt.text.value.trim();
if (displayedQuestion === expectedQuestion) {
var expectedAnswer = questionsAnswers[id].typing.answer.value;
if (expectedQuestion && expectedAnswer) {
return {
question : expectedQuestion,
answer   : expectedAnswer
};
}
}
}
};
var displayError = function(msg) {
var kanaError = document.getElementById('kanaError');
if (kanaError && !msg) {
kanaError.parentNode.removeChild(kanaError);
return;
}
if (!kanaError) {
var elem = document.createElement("div");
elem.id = "kanaError";
elem.align = "center";
elem.style = "font-weight: bold; font-size:34px; color:#FF0000;";
elem.textContent = msg;
document.body.append(elem);
}
};
var enterKeyDisabler = function(event){
var keycode = event.which || event.keycode;
var kanaError = document.getElementById('kanaError');
if (kanaError && keycode == 13) {
event.preventDefault();
}
};
window.addEventListener("keypress", enterKeyDisabler);
var isAnswerHiragana = false;
var isAnswerKatakana = false;
var calculateKanaType = function(answer) {
for (var i = 0; i < answer.length; ++i) {
//Hiragana check
if (answer.charCodeAt(i) >= 12353 && answer.charCodeAt(i) <= 12435 ) {
isAnswerHiragana = true;
}
//Katakana check
else if (answer.charCodeAt(i) >= 12443 && answer.charCodeAt(i) <= 12532 ) {
isAnswerKatakana = true;
}
}
};
var compareAnswer = function(given) {
var givenhiragana = 0;
var givenkatakana = 0;
var givenenglish = 0;
if (!given || given.length === 0) return;
for (var i = 0; i < given.length; ++i) {
//Calculate user's answer for Kana type
if (given.charCodeAt(i) >= 12353 && given.charCodeAt(i) <= 12435) {
++givenhiragana;
}
else if (given.charCodeAt(i) >= 12443 && given.charCodeAt(i) <= 12532 ) {
++givenkatakana;
}
//Actual English || Kana inputted English
else if (given.charCodeAt(i) >= 65 && given.charCodeAt(i) <= 122 || given.charCodeAt(i) >= 65346 && given.charCodeAt(i) <= 65370) {
++givenenglish;
}
//Compare our two kana types, the expected answer and the user's
if (isAnswerHiragana && isAnswerKatakana){
if (givenhiragana === 0 || givenkatakana === 0 || givenenglish > 0){
displayError("Hiragana & Katakana!");
}
else if (givenhiragana > 0 && givenkatakana > 0 && givenenglish === 0){
displayError("");
}
}
else if (isAnswerHiragana){
if (givenhiragana === 0 || givenkatakana > 0 || givenenglish > 0){
displayError("Hiragana!");
}
else if (givenhiragana > 0 && givenkatakana === 0 && givenenglish === 0){
displayError("");
}
}
else if (isAnswerKatakana){
if (givenkatakana === 0 || givenhiragana > 0 || givenenglish > 0){
displayError("Katakana!");
}
else if (givenkatakana > 0 && givenhiragana === 0 && givenenglish === 0){
displayError("");
}
}
}
};
var cachedQuestion = "";
var checkAnswer = function() {
var displayedQuestion = document.getElementsByClassName("qquestion")[0].childNodes[0].nodeValue.trim();
var givenAnswer = document.getElementsByClassName("typing-type-here")[0].value;
var expectedAnswer = getCurrentItem(displayedQuestion).answer;
//Evaluate kana type of the expectedAnswer
if (displayedQuestion != cachedQuestion) {
cachedQuestion = displayedQuestion;
calculateKanaType(expectedAnswer);
}
if (givenAnswer) {
compareAnswer(givenAnswer);
}
};
window.addEventListener("keyup", checkAnswer);
};
window.addEventListener('load',
function() {
onLoad();
}, false);