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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<meta name="theme-color" content="#4285f4" />
<title>Cryptoquote</title>
<link rel="shortcut icon" href="src/images/icon.svg" type="image/svg" />
<link rel="manifest" href="manifest.webmanifest" />
</head>
<body>
<main id="main">
<h1>Cryptoquote</h1>
<hr />
<section>
<details open>
<summary>Enter encrypted text</summary>
<div id="ciphertext-input-container">
<textarea
id="ciphertext-input"
placeholder="Enter encrypted text"
></textarea>
</div>
<a href="#" id="reset">Reset</a>
</details>
</section>
<hr />
<section>
<p id="ciphertext"></p>
</section>
<section>
<input type="text" id="dummy-input" tabindex="-1" />
<p id="plaintext"></p>
<a href="#" id="clear">Clear</a>
</section>
<hr />
<section>
<h5>Remaining letters</h5>
<p id="unused-letters"></p>
<p id="used-letters"></p>
</section>
<hr />
<h5>Cheats</h5>
<section>
<details>
<summary>Character counts</summary>
<p id="ciphertext-char-tally"></p>
<hr />
</details>
</section>
<section>
<details>
<summary>Suggestions</summary>
<p>Click on a word to generate suggestions:</p>
<p id="suggestions-ciphertext"></p>
<p id="suggestions-list"></p>
</details>
</section>
</main>
</body>
<style>
html {
font-family: 'Courier New', Courier, monospace;
font-size: x-large;
overflow-wrap: break-word;
background-image: url(./src/images/background.jpg);
background-size: cover;
}
#main {
max-width: 500px;
margin: auto;
}
h1,
h5 {
margin-top: 0.5em;
margin-bottom: 0.5em;
}
a.unstyled-link {
text-decoration: none;
color: black;
}
#reset,
#clear {
font-size: medium;
}
#ciphertext-input-container {
padding: 0 20px 0 20px;
}
#ciphertext-input {
width: 100%;
height: 100px;
}
.highlight {
background-color: yellow;
}
.char {
margin-right: 0.1rem;
}
#plaintext .char {
text-decoration: underline;
text-decoration-color: black;
text-decoration-thickness: 1px;
}
.char[data-used-letter] {
color: gray;
text-decoration: line-through;
}
#dummy-input {
position: absolute;
left: -9999px;
}
#ciphertext-char-tally {
display: grid;
grid-auto-flow: column;
grid-template-rows: repeat(9, auto);
grid-template-columns: repeat(3, auto);
}
#suggestions-ciphertext .word {
letter-spacing: 0.1rem;
}
</style>
<script src="https://cdn.jsdelivr.net/npm/canvas-confetti@1.4.0/dist/confetti.browser.min.js"></script>
<script>
'use strict';
/**
* HTML elements
*/
const ciphertextInputElement = document.querySelector('#ciphertext-input');
const ciphertextElement = document.querySelector('#ciphertext');
const plaintextElement = document.querySelector('#plaintext');
const unusedLettersElement = document.querySelector('#unused-letters');
const usedLettersElement = document.querySelector('#used-letters');
const ciphertextCharTallyElement = document.querySelector(
'#ciphertext-char-tally'
);
const suggestionsCiphertextElement = document.querySelector(
'#suggestions-ciphertext'
);
const suggestionsListElement = document.querySelector('#suggestions-list');
const dummyInput = document.querySelector('#dummy-input');
/**
* Global variables
*/
let ciphertext = localStorage.ciphertext || '';
let translationMap = localStorage.translationMap
? JSON.parse(localStorage.translationMap)
: {};
let selectedChar;
let commonWords;
let selectedTabGroupElement = ciphertextElement;
/**
* Update state
*/
function setCiphertext(newCiphertext) {
ciphertext = newCiphertext.toUpperCase();
localStorage.ciphertext = ciphertext;
renderCiphertext();
renderPlaintext();
renderCharTally();
renderSuggestionsCiphertext();
}
function setTranslationMap(newTranslationMap, confetti = true) {
localStorage.translationMap = JSON.stringify(newTranslationMap);
translationMap = newTranslationMap;
renderCiphertext();
renderPlaintext();
renderUsedLetters();
renderCharTally();
unselectChar();
returnFocus();
if (confetti) confettiOnCompletion();
}
/**
* Update DOM
*/
async function renderCiphertextInput() {
ciphertextInputElement.value = ciphertext;
}
async function renderCiphertext() {
ciphertextElement.innerHTML = ciphertext
.split('')
.map((char, index) => {
if (Object.keys(translationMap).includes(char)) {
return `<a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${char}" data-used-letter>${char}</a>`;
} else if (/[A-Z]/.test(char)) {
return `<a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${char}">${char}</a>`;
} else if (char === '\n') {
return '<br />';
} else {
return char;
}
})
.join('');
setupCharElements(ciphertextElement);
setupTabGroup(ciphertextElement);
}
async function renderPlaintext() {
plaintextElement.innerHTML = ciphertext
.split('')
.map((char, index) => {
if (translationMap[char]) {
return `<a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${char}">${translationMap[char]}</a>`;
} else if (/[A-Z]/.test(char)) {
// Using transparent '_' instead of ' ' for testability
return `<a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${char}" style='color: transparent;'>_</a>`;
} else if (char === '\n') {
return '<br />';
} else {
return char;
}
})
.join('');
setupCharElements(plaintextElement);
setupTabGroup(plaintextElement);
}
async function renderUsedLetters() {
const usedLetters = Object.values(translationMap).sort();
const unusedLetters = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ'
.split('')
.filter((char) => !usedLetters.includes(char));
unusedLettersElement.innerHTML = unusedLetters
.map((char) => `<span class="char">${char}</span>`)
.join('');
usedLettersElement.innerHTML = usedLetters
.map((char) => {
const dataCiphertextChar = Object.entries(translationMap).find(
([key, value]) => value === char
)[0];
return `<a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${dataCiphertextChar}" data-used-letter>${char}</a>`;
})
.join('');
usedLettersElement.dataset.selectedIndex = 0;
setupCharElements(usedLettersElement);
setupTabGroup(usedLettersElement);
}
async function renderCharTally() {
const ciphertextCharTally = {};
ciphertext
.replace(/[^A-Z]/g, '')
.split('')
.forEach((char) =>
ciphertextCharTally[char]
? (ciphertextCharTally[char] += 1)
: (ciphertextCharTally[char] = 1)
);
const rowCount = Math.ceil(Object.keys(ciphertextCharTally).length / 3);
ciphertextCharTallyElement.style[
'grid-template-rows'
] = `repeat(${rowCount}, auto`;
ciphertextCharTallyElement.innerHTML = Object.entries(ciphertextCharTally)
.sort(([_char1, tally1], [_char2, tally2]) => tally2 - tally1)
.map(([char, tally]) => {
const isUsedLetter = Object.keys(translationMap).includes(char);
return `<div><a href="#" class="char tab-group-item unstyled-link" data-ciphertext-char="${char}" ${
isUsedLetter ? 'data-used-letter' : ''
}>${char}: ${tally}</a></div>`;
})
.join('');
setupCharElements(ciphertextCharTallyElement);
setupTabGroup(ciphertextCharTallyElement);
}
async function renderSuggestionsCiphertext() {
suggestionsCiphertextElement.innerHTML = ciphertext
.replace(
/[\w'’]+/g,
(word) =>
`<a href="#" class="word tab-group-item unstyled-link">${word}</a>`
)
.replace(/\n/g, '<br />');
setupTabGroup(suggestionsCiphertextElement);
}
async function renderSuggestionsList(clickEvent) {
clickEvent.preventDefault();
const clickedWord = clickEvent.target.innerText;
commonWords =
commonWords ||
(await fetch('src/words.txt')
.then((response) => response.text())
.then((txt) => txt.split('\n')));
let words = commonWords;
words = words.filter((word) => word.length === clickedWord.length);
clickedWord.split('').forEach((charA, indexA) => {
if (charA === "'" || charA === '’') {
words = words.filter((word) => word[indexA] === "'");
} else {
words = words.filter((word) => word[indexA].toUpperCase() !== charA);
words = words.filter((word) => word[indexA] !== "'");
}
if (translationMap[charA]) {
words = words.filter(
(word) => word[indexA].toUpperCase() === translationMap[charA]
);
} else {
words = words.filter((word) => {
const usedLetters = Object.values(translationMap);
return !usedLetters.includes(word[indexA].toUpperCase());
});
}
clickedWord
.slice(indexA + 1)
.split('')
.forEach((charB, indexB) => {
words = words.filter(
(word) =>
(charA === charB) ===
(word[indexA] === word[indexA + indexB + 1])
);
});
});
const numberOfWordsToShow = 12;
suggestionsListElement.innerHTML = `Suggestions:<br />${words
.slice(0, numberOfWordsToShow)
.map(
(word) =>
`<a href="#" class="suggested-word tab-group-item unstyled-link">${word}</a>`
)
.join(', ')}${words.length > numberOfWordsToShow ? ', ...' : ''}`;
suggestionsListElement
.querySelector('.suggested-word:first-of-type')
?.scrollIntoView();
suggestionsListElement
.querySelectorAll('.suggested-word')
.forEach((suggestedWord) => {
suggestedWord.addEventListener('click', (clickEvent) => {
clickEvent.preventDefault();
clickEvent.target.innerText
.replace(/\W/g, '')
.split('')
.forEach((plaintextChar, index) => {
plaintextChar = plaintextChar.toUpperCase();
Object.entries(translationMap).forEach(([ctChar, ptChar]) => {
if (ptChar === plaintextChar) {
delete translationMap[ctChar];
}
});
const ciphertextChar = clickedWord.replace(/\W/g, '')[index];
translationMap[ciphertextChar] = plaintextChar;
});
setTranslationMap(translationMap);
});
});
setupTabGroup(suggestionsListElement);
}
function setupCharElements(charGroupElement) {
charGroupElement
.querySelectorAll('.char')
.forEach((charElement, index) => {
charElement.addEventListener('click', (clickEvent) => {
clickEvent.preventDefault();
document
.querySelectorAll('.char')
.forEach((charElement) =>
charElement.classList.remove('highlight')
);
selectedChar = charElement.getAttribute('data-ciphertext-char');
const selectedCharElements = document.querySelectorAll(
`.char[data-ciphertext-char="${selectedChar}"]`
);
selectedCharElements.forEach((selectedCharElement) =>
selectedCharElement.classList.add('highlight')
);
const xPosition = window.scrollX;
const yPosition = window.scrollY;
dummyInput.focus();
window.scroll(xPosition, yPosition);
});
});
}
function setupTabGroup(tabGroupElement) {
function modulo(a, n) {
return ((a % n) + n) % n;
}
tabGroupElement.dataset.selectedIndex =
tabGroupElement.dataset.selectedIndex || 0;
tabGroupElement
.querySelectorAll('.tab-group-item')
.forEach((selectableElement, index) => {
const tabindex =
index == tabGroupElement.dataset.selectedIndex ? 0 : -1;
selectableElement.tabIndex = tabindex;
selectableElement.addEventListener('click', (clickEvent) => {
clickEvent.preventDefault();
selectedTabGroupElement = tabGroupElement;
tabGroupElement.querySelector(
'.tab-group-item[tabindex="0"]'
).tabIndex = -1;
tabGroupElement.dataset.selectedIndex = index;
clickEvent.target.tabIndex = 0;
});
selectableElement.addEventListener('keydown', (keydownEvent) => {
let increment;
if (
keydownEvent.key === 'ArrowLeft' ||
keydownEvent.key === 'ArrowUp'
) {
increment = -1;
} else if (
keydownEvent.key === 'ArrowRight' ||
keydownEvent.key === 'ArrowDown'
) {
increment = +1;
} else {
return;
}
keydownEvent.preventDefault();
keydownEvent.target.tabIndex = -1;
const charCount = tabGroupElement.querySelectorAll(
'.tab-group-item'
).length;
const selectedIndex = modulo(
parseInt(tabGroupElement.dataset.selectedIndex) + increment,
charCount
);
tabGroupElement.dataset.selectedIndex = selectedIndex;
const newSelectedElement = tabGroupElement.querySelectorAll(
'.tab-group-item'
)[selectedIndex];
newSelectedElement.tabIndex = 0;
newSelectedElement.focus();
});
});
}
function unselectChar() {
document
.querySelectorAll('.char')
.forEach((charElement) => charElement.classList.remove('highlight'));
selectedChar = null;
}
function returnFocus() {
selectedTabGroupElement
.querySelector('.tab-group-item[tabindex="0"]')
?.focus();
}
function handleDummyInputKeyUp(event) {
if (!selectedChar) return;
const key = event.key;
if (key === 'Escape') {
unselectChar();
returnFocus();
} else if (key === 'Backspace' || key === 'Delete') {
delete translationMap[selectedChar];
setTranslationMap(translationMap);
}
}
function handleDummyInput() {
const dummyInputValue = dummyInput.value.toUpperCase();
dummyInput.value = null;
if (!selectedChar) {
console.error('No character selected');
return;
} else if (!dummyInputValue.match(/^[A-Z]$/)) {
console.error('Input more than a single character: ', dummyInputValue);
return;
}
Object.entries(translationMap).forEach(
([ciphertextChar, plaintextChar]) => {
if (plaintextChar === dummyInputValue) {
delete translationMap[ciphertextChar];
}
}
);
translationMap[selectedChar] = dummyInputValue;
setTranslationMap(translationMap);
}
function reset(clickEvent) {
clickEvent.preventDefault();
suggestionsListElement.innerHTML = '';
ciphertext = '';
translationMap = {};
initialize();
}
function initialize() {
setCiphertext(ciphertext);
renderCiphertextInput();
setTranslationMap(translationMap, false);
}
function clear(clickEvent) {
clickEvent.preventDefault();
suggestionsListElement.innerHTML = '';
setTranslationMap({});
}
initialize();
async function confettiOnCompletion() {
function isComplete() {
return (
ciphertext.length > 0 &&
ciphertext
.replace(/\W/g, '')
.split('')
.every((ciphertextChar) =>
Object.keys(translationMap).includes(ciphertextChar)
)
);
}
if (isComplete()) {
var count = 200;
var defaults = {
origin: { y: 0.7 },
};
function fire(particleRatio, opts) {
confetti(
Object.assign({}, defaults, opts, {
particleCount: Math.floor(count * particleRatio),
})
);
}
fire(0.25, {
spread: 26,
startVelocity: 55,
});
fire(0.2, {
spread: 60,
});
fire(0.35, {
spread: 100,
decay: 0.91,
scalar: 0.8,
});
fire(0.1, {
spread: 120,
startVelocity: 25,
decay: 0.92,
scalar: 1.2,
});
fire(0.1, {
spread: 120,
startVelocity: 45,
});
}
}
/**
* Add event listeners
*/
ciphertextInputElement.addEventListener('input', (event) =>
setCiphertext(event.target.value)
);
// The purpose of this dummy input is twofold: 1) mobile keyboards won't come up unless an input field is in focus, and 2) mobile keyboards (specifically Android) don't recognize the `event.key` on keydown/keyup events, so this captures the key by reading the input value.
dummyInput.addEventListener('keyup', handleDummyInputKeyUp);
dummyInput.addEventListener('input', handleDummyInput);
dummyInput.addEventListener('blur', unselectChar);
document.querySelector('#reset').addEventListener('click', reset);
document.querySelector('#clear').addEventListener('click', clear);
suggestionsCiphertextElement.addEventListener(
'click',
renderSuggestionsList
);
/**
* Progressive web app service worker
*/
window.addEventListener('load', () => {
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('./service-worker.js');
}
});
</script>
</html>