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decoder.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<style>
h1, h3, p {
margin: 0;
}
body {
margin: 1rem 0;
display: flex;
flex-direction: column;
align-items: center;
font-family: "Lucida Console", Monaco, monospace;
}
body > * {
margin: 1rem 0;
}
.presets {
width: 100%;
display: flex;
flex-direction: column;
align-items: center;
}
.presets > * {
margin: 0.25rem 0;
}
.inputs {
width: min(100%, 40rem);
display: grid;
justify-content: space-around;
align-items: center;
grid-template-columns: repeat(2, auto);
grid-template-rows: repeat(13, auto);
}
.inputs > * {
margin: 0.5rem 0;
}
.inputs input {
width: 2rem;
}
.errors {
color: red;
text-align: center;
}
.message {
width: min(90%, 35rem);
}
.message > p {
margin-bottom: 0.5rem;
}
textarea {
width: 100%;
height: 6rem;
}
</style>
<title>Decoder</title>
</head>
<body>
<div class="presets">
<h3>Presets:</h3>
<button onclick="presetNumbered()">Numbered</button>
<button onclick="presetNumberedBackwards()">Numbered Backwards</button>
<button onclick="presetRandomNumbers()">Random Numbers</button>
<button onclick="presetRandomLetters()">Random Letters</button>
</div>
<div class="inputs"></div>
<div class="errors"></div>
<div class="message">
<p>Message (letters and spaces only):</p>
<textarea class="decoded"></textarea>
</div>
<div class="actions">
<button class="encode" onclick="encodeMessage()">Encode</button>
<button class="decode" onclick="decodeMessage()">Decode</button>
</div>
<div class="message">
<p>Encoded Message:</p>
<textarea class="encoded"></textarea>
</div>
<script>
const errorsElement = document.querySelector('.errors')
const clearErrors = () => errorsElement.innerHTML = ''
const addError = (message) => {
const errorElement = document.createElement('p')
errorElement.innerText = message
errorsElement.appendChild(errorElement)
}
const letterInputs = document.querySelector('.inputs')
const messageInput = document.querySelector(".decoded")
const encodedMessageInput = document.querySelector(".encoded")
const letters = []
for (let i = 0; i < 26; i++) letters.push(String.fromCharCode(i + 65))
const encoded = {}
const presetNumbered = () => {
letters.forEach((letter, index) => {
const letterInput = document.getElementById(letter)
letterInput.value = index + 1
})
}
const presetNumberedBackwards = () => {
letters.forEach((letter, index) => {
const letterInput = document.getElementById(letter)
letterInput.value = 26 - index
})
}
const randomInt = (min, max) => {
min = Math.ceil(min)
max = Math.floor(max)
return Math.floor(Math.random() * (max - min) + min)
}
const presetRandomNumbers = () => {
const used = []
letters.forEach((letter, index) => {
const letterInput = document.getElementById(letter)
let number = randomInt(1, 27)
while (used.includes(number)) number = randomInt(1, 27)
letterInput.value = number
used.push(number)
})
}
const presetRandomLetters = () => {
const used = []
letters.forEach((letter, index) => {
const letterInput = document.getElementById(letter)
let number = randomInt(0, 26)
while (used.includes(number)) number = randomInt(0, 26)
letterInput.value = String.fromCharCode(number + 65)
used.push(number)
})
}
const letterValuesValid = () => {
clearErrors()
let valid = true
const usedValues = []
letters.forEach((letter) => {
const letterInput = document.getElementById(letter)
letterInput.value = letterInput.value.trim()
if (!letterInput.value) {
addError(`Please add a value for the letter ${letter}.`)
valid = false
return
}
if (letterInput.value.includes(',')) {
addError(`Please remove all commas from the value of ${letter}.`)
valid = false
return
}
if (letterInput.value.includes(' ')) {
addError(`Please remove all spaces from the value of ${letter}.`)
valid = false
return
}
if (usedValues.includes(letterInput.value)) {
addError(`The value of ${letter} is already used by another letter.`)
valid = false
return
}
encoded[letter] = letterInput.value
usedValues.push(letterInput.value)
})
return valid
}
const messageValid = () => {
clearErrors()
let valid = true
messageInput.value = messageInput.value
.trim()
.toUpperCase()
.replace(/(?:\r\n|\r|\n)/g, ' ')
if (!messageInput.value) {
addError('Please enter a message.')
valid = false
}
if (!/^[a-zA-Z\s]*$/.test(messageInput.value)) {
addError('Messages can only have letters and spaces.')
valid = false
}
return valid
}
const encodedMessageValid = () => {
clearErrors()
let valid = true
encodedMessageInput.value = encodedMessageInput.value.trim()
if (!encodedMessageInput.value) {
addError('Please enter an encoded message.')
valid = false
}
return valid
}
const encodeMessage = () => {
if (!letterValuesValid()) return
if (!messageValid()) return
const message = messageInput.value.toUpperCase()
const encodedMessage = message.split(' ').map(word => (
word.split('').map(letter => encoded[letter]).join(',')
)).join(' ')
encodedMessageInput.value = encodedMessage
}
const decodeMessage = () => {
if (!letterValuesValid()) return
if (!encodedMessageValid()) return
let failed = false
const encodedMessage = encodedMessageInput.value
const message = encodedMessage.split(' ').map(word => (
word.split(',').map(encodedLetter => {
const decoded = letters.find(letter => (
encoded[letter] == encodedLetter
))
if (!decoded) failed = true
return decoded
}).join('')
)).join(' ')
if (!failed) messageInput.value = message
else addError('Failed to decode message.')
}
letters.forEach((letter, index) => {
const letterField = document.createElement("div")
const row = index <= 12 ? index + 1 : index - 12
const column = index <= 12 ? 1 : 2
letterField.style.gridArea = `${row}/${column}/${row}/${column}`
const letterLabel = document.createElement('label')
letterLabel.innerText = letter + ' = '
letterLabel.htmlFor = letter
const letterInput = document.createElement("input")
letterInput.type = "text"
letterInput.id = letter
letterField.appendChild(letterLabel)
letterField.appendChild(letterInput)
letterInputs.appendChild(letterField)
})
</script>
</body>
</html>