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backspace/packages/web/src/utils/customEmoji.ts
T
devsyncwrldandClaude Opus 5 7d003021d1 feat(expressions): custom emojis and stickers per space
Emojis and stickers get separate tables on purpose: an emoji sits inside a
sentence and a sticker is the whole message, so their sizes, limits and render
paths differ.

Emoji names are unique per space and restricted to letters, digits and
underscore — :name: has to resolve to one image, and a space or colon inside
the name would make the reference impossible to delimit. Sticker names are
labels picked from a grid, so they accept anything.

Rendering reuses the existing markdown pipeline by rewriting :name: into image
syntax, which needs no plugin. Code spans and fences are left alone: text
someone wrapped in backticks was meant to be shown literally, and turning it
into an image would destroy what they wrote.

Messages carry stickerId with ON DELETE set null — removing a sticker from the
space must not delete the history of everyone who used it. The server refuses a
sticker from another space, which would otherwise leak images between unrelated
servers.

Expressions load once per space and stay in memory: the message renderer
consults the map for every :name: it finds, and a request per lookup would turn
each message into a cascade.

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
2026-09-01 17:57:32 -03:00

40 lines
1.4 KiB
TypeScript

import type { SpaceEmoji } from '../api/client';
/**
* Troca `:nome:` pela sintaxe de imagem do markdown, para o renderizador
* existente desenhar o emoji próprio sem precisar de plugin.
*
* Trechos de código são preservados: `:nome:` dentro de crase é texto que a
* pessoa quis mostrar literalmente, e virar imagem ali seria destruir o que ela
* escreveu.
*/
export function renderCustomEmojis(
content: string,
lookup: (name: string) => SpaceEmoji | undefined,
urlOf: (filename: string) => string,
): string {
if (!content.includes(':')) return content;
// Divide preservando blocos cercados (```) e código em linha (`) —
// os delimitadores ficam nos pedaços ímpares e passam intactos.
const parts = content.split(/(```[\s\S]*?```|`[^`]*`)/g);
return parts
.map((part, i) => {
if (i % 2 === 1) return part;
return part.replace(/:([a-z0-9_]{2,32}):/gi, (whole, name: string) => {
const emoji = lookup(name.toLowerCase());
if (!emoji) return whole;
// O alt conserva `:nome:` para que copiar a mensagem devolva o texto
// original, e é por ele que o renderizador reconhece o emoji.
return `![:${emoji.name}:](${urlOf(emoji.filename)})`;
});
})
.join('');
}
/** O renderizador usa isto para dar tamanho de emoji em vez de imagem normal. */
export function isCustomEmojiAlt(alt: string | undefined): boolean {
return !!alt && /^:[a-z0-9_]{2,32}:$/i.test(alt);
}