リモートユーザーのHTMLで表現されたプロフィールをMFMに変換するように

src/mfm/parse/elements/mention.ts

@@ -0,0 +1,24 @@
+/**
+ * Mention
+ */
+import parseAcct from '../../../acct/parse';
+
+export type TextElementMention = {
+	type: 'mention'
+	content: string
+	username: string
+	host: string
+};
+
+export default function(text: string) {
+	const match = text.match(/^@[a-z0-9_]+(?:@[a-z0-9\.\-]+[a-z0-9])?/i);
+	if (!match) return null;
+	const mention = match[0];
+	const { username, host } = parseAcct(mention.substr(1));
+	return {
+		type: 'mention',
+		content: mention,
+		username,
+		host
+	} as TextElementMention;
+}