tcsenpai/emoji-encoder
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new encoding

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This commit is contained in:
Paul Butler 2025-02-08 09:09:56 -05:00
parent bf1d29e704
commit dac64bd184
3 changed files with 48 additions and 12 deletions
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2
app/emoji.ts
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@ -7,7 +7,7 @@ export const EMOJI_LIST = [
"👍",
"👎",
"👏",
"🙌",
"😅",
"🤝",
"🎉",
"🎂",

52
app/encoding.ts
View File

@ -1,12 +1,40 @@
// Variation selectors block https://unicode.org/charts/nameslist/n_FE00.html
// VS1..=VS16
const VARIATION_SELECTOR_START = 0xfe00;
const VARIATION_SELECTOR_END = 0xfe0f;
// Variation selectors supplement https://unicode.org/charts/nameslist/n_E0100.html
// VS17..=VS256
const VARIATION_SELECTOR_SUPPLEMENT_START = 0xe0100;
const VARIATION_SELECTOR_SUPPLEMENT_END = 0xe01ef;
export function toVariationSelector(byte: number): string | null {
if (byte >= 0 && byte < 16) {
return String.fromCodePoint(VARIATION_SELECTOR_START + byte)
} else if (byte >= 16 && byte < 256) {
return String.fromCodePoint(VARIATION_SELECTOR_SUPPLEMENT_START + byte)
} else {
return null
}
}
export function fromVariationSelector(codePoint: number): number | null {
if (codePoint >= VARIATION_SELECTOR_START && codePoint <= VARIATION_SELECTOR_END) {
return codePoint - VARIATION_SELECTOR_START
} else if (codePoint >= VARIATION_SELECTOR_SUPPLEMENT_START && codePoint <= VARIATION_SELECTOR_SUPPLEMENT_END) {
return codePoint - VARIATION_SELECTOR_SUPPLEMENT_START
} else {
return null
}
}
export function encode(emoji: string, text: string): string {
// convert the string to utf-8 bytes
const bytes = new TextEncoder().encode(text)
let encoded = emoji
for (const char of bytes) {
const upper = char >> 4
const lower = char & 0b1111
encoded += String.fromCodePoint(upper + 0xfe00, lower + 0xfe00)
for (const byte of bytes) {
encoded += toVariationSelector(byte)
}
return encoded
@ -14,16 +42,18 @@ export function encode(emoji: string, text: string): string {
export function decode(text: string): string {
let decoded = []
for (let i = 2; i < text.length; i += 2) {
const upper = text.charCodeAt(i) - 0xfe00
const lower = text.charCodeAt(i + 1) - 0xfe00
const chars = Array.from(text)
if (upper < 0 || upper > 15 || lower < 0 || lower > 15) {
break;
for (const char of chars) {
const byte = fromVariationSelector(char.codePointAt(0)!)
if (byte === null && decoded.length > 0) {
break
} else if (byte === null) {
continue
}
decoded.push((upper << 4) | lower)
decoded.push(byte)
}
let decodedArray = new Uint8Array(decoded)

6
app/layout.tsx
View File

@ -12,6 +12,12 @@ export default function RootLayout({
}>) {
return (
<html lang="en">
<head>
<link
rel="icon"
href="data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 100 100'><text y='.9em' font-size='90'>😅</text></svg>"
/>
</head>
<body>{children}</body>
</html>
)