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>

packages/frontend/src/components/MkEmojiPicker.vue

@@ -74,7 +74,7 @@
 		</div>
 		<div v-once class="group">
 			<header class="_acrylic">{{ i18n.ts.emoji }}</header>
-			<XSection v-for="category in categories" :key="category" :emojis="emojilist.filter(e => e.category === category).map(e => e.char)" @chosen="chosen">{{ category }}</XSection>
+			<XSection v-for="category in categories" :key="category" :emojis="emojiCharByCategory.get(category) ?? []" @chosen="chosen">{{ category }}</XSection>
 		</div>
 	</div>
 	<div class="tabs">
@@ -90,7 +90,7 @@
 import { ref, shallowRef, computed, watch, onMounted } from 'vue';
 import * as Misskey from 'misskey-js';
 import XSection from '@/components/MkEmojiPicker.section.vue';
-import { emojilist, UnicodeEmojiDef, unicodeEmojiCategories as categories } from '@/scripts/emojilist';
+import { emojilist, emojiCharByCategory, UnicodeEmojiDef, unicodeEmojiCategories as categories } from '@/scripts/emojilist';
 import MkRippleEffect from '@/components/MkRippleEffect.vue';
 import * as os from '@/os';
 import { isTouchUsing } from '@/scripts/touch';

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;
+	}
 }