1 files changed, 20 insertions, 0 deletions
diff --git a/packages/frontend/src/scripts/emoji-base.ts b/packages/frontend/src/scripts/emoji-base.ts
new file mode 100644
index 0000000000..3f05642d57
--- /dev/null
+++ b/packages/frontend/src/scripts/emoji-base.ts
@@ -0,0 +1,20 @@
+const twemojiSvgBase = '/twemoji';
+const fluentEmojiPngBase = '/fluent-emoji';
+
+export function char2twemojiFilePath(char: string): string {
+	let codes = Array.from(char).map(x => x.codePointAt(0)?.toString(16));
+	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
+	codes = codes.filter(x => x && x.length);
+	const fileName = codes.join('-');
+	return `${twemojiSvgBase}/${fileName}.svg`;
+}
+
+export function char2fluentEmojiFilePath(char: string): string {
+	let codes = Array.from(char).map(x => x.codePointAt(0)?.toString(16));
+	// Fluent Emojiは国旗非対応 https://github.com/microsoft/fluentui-emoji/issues/25
+	if (codes[0]?.startsWith('1f1')) return char2twemojiFilePath(char);
+	if (!codes.includes('200d')) codes = codes.filter(x => x !== 'fe0f');
+	codes = codes.filter(x => x && x.length);
+	const fileName = codes.map(x => x!.padStart(4, '0')).join('-');
+	return `${fluentEmojiPngBase}/${fileName}.png`;
+}