enhance: Unicode絵文字名逆引き効率化 (#9757)

* Unicode絵文字名前取得を連想配列で行う

* Unicode絵文字事前カテゴリ集計

* Mapを使用

* Update packages/frontend/src/scripts/emojilist.ts

Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

---------

Co-authored-by: tamaina <tamaina@hotmail.co.jp>
Co-authored-by: Acid Chicken (硫酸鶏) <root@acid-chicken.com>

1 files changed, 20 insertions, 1 deletions

diff --git a/packages/frontend/src/scripts/emojilist.ts b/packages/frontend/src/scripts/emojilist.ts
index bc52fa7a43..2e853b58b5 100644
--- a/packages/frontend/src/scripts/emojilist.ts
+++ b/packages/frontend/src/scripts/emojilist.ts
@@ -12,6 +12,25 @@ import _emojilist from '../emojilist.json';
 
 export const emojilist = _emojilist as UnicodeEmojiDef[];
 
+const _indexByChar = new Map<string, number>();
+const _charGroupByCategory = new Map<string, string[]>();
+emojilist.forEach((emo, i) => {
+	_indexByChar.set(emo.char, i);
+
+	if (_charGroupByCategory.has(emo.category)) {
+		_charGroupByCategory.get(emo.category)?.push(emo.char);
+	} else {
+		_charGroupByCategory.set(emo.category, [emo.char]);
+	}
+});
+
+export const emojiCharByCategory = _charGroupByCategory;
+
 export function getEmojiName(char: string): string | undefined {
-	return emojilist.find(emo => emo.char === char)?.name;
+	const idx = _indexByChar.get(char);
+	if (typeof idx === 'undefined') {
+		return undefined;
+	} else {
+		return emojilist[idx].name;
+	}
 }