Sharkey/packages/frontend/src/scripts/search-emoji.ts
2024-03-01 17:28:46 +09:00

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/*
* SPDX-FileCopyrightText: syuilo and misskey-project
* SPDX-License-Identifier: AGPL-3.0-only
*/
export type EmojiDef = {
emoji: string;
name: string;
url: string;
aliasOf?: string;
} | {
emoji: string;
name: string;
aliasOf?: string;
isCustomEmoji?: true;
};
type EmojiScore = { emoji: EmojiDef, score: number };
export function searchEmoji(query: string | null, emojiDb: EmojiDef[], max = 30): EmojiDef[] {
if (!query) {
return [];
}
const matched = new Map<string, EmojiScore>();
// 完全一致(エイリアスなし)
emojiDb.some(x => {
if (x.name === query && !x.aliasOf) {
matched.set(x.name, { emoji: x, score: query.length + 3 });
}
return matched.size === max;
});
// 完全一致(エイリアス込み)
if (matched.size < max) {
emojiDb.some(x => {
if (x.name === query && !matched.has(x.aliasOf ?? x.name)) {
matched.set(x.aliasOf ?? x.name, { emoji: x, score: query.length + 2 });
}
return matched.size === max;
});
}
// 前方一致(エイリアスなし)
if (matched.size < max) {
emojiDb.some(x => {
if (x.name.startsWith(query) && !x.aliasOf && !matched.has(x.name)) {
matched.set(x.name, { emoji: x, score: query.length + 1 });
}
return matched.size === max;
});
}
// 前方一致(エイリアス込み)
if (matched.size < max) {
emojiDb.some(x => {
if (x.name.startsWith(query) && !matched.has(x.aliasOf ?? x.name)) {
matched.set(x.aliasOf ?? x.name, { emoji: x, score: query.length });
}
return matched.size === max;
});
}
// 部分一致(エイリアス込み)
if (matched.size < max) {
emojiDb.some(x => {
if (x.name.includes(query) && !matched.has(x.aliasOf ?? x.name)) {
matched.set(x.aliasOf ?? x.name, { emoji: x, score: query.length - 1 });
}
return matched.size === max;
});
}
// 簡易あいまい検索3文字以上
if (matched.size < max && query.length > 3) {
const queryChars = [...query];
const hitEmojis = new Map<string, EmojiScore>();
for (const x of emojiDb) {
// 文字列の位置を進めながら、クエリの文字を順番に探す
let pos = 0;
let hit = 0;
for (const c of queryChars) {
pos = x.name.indexOf(c, pos);
if (pos <= -1) break;
hit++;
}
// 半分以上の文字が含まれていればヒットとする
if (hit > Math.ceil(queryChars.length / 2) && hit - 2 > (matched.get(x.aliasOf ?? x.name)?.score ?? 0)) {
hitEmojis.set(x.aliasOf ?? x.name, { emoji: x, score: hit - 2 });
}
}
// ヒットしたものを全部追加すると雑多になるので、先頭の6件程度だけにしておく6件オートコンプリートのポップアップのサイズ分
[...hitEmojis.values()]
.sort((x, y) => y.score - x.score)
.slice(0, 6)
.forEach(it => matched.set(it.emoji.name, it));
}
return [...matched.values()]
.sort((x, y) => y.score - x.score)
.slice(0, max)
.map(it => it.emoji);
}