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/index.ts

@@ -0,0 +1,99 @@
+/**
+ * Misskey Text Analyzer
+ */
+
+import { TextElementBold } from './elements/bold';
+import { TextElementCode } from './elements/code';
+import { TextElementEmoji } from './elements/emoji';
+import { TextElementHashtag } from './elements/hashtag';
+import { TextElementInlineCode } from './elements/inline-code';
+import { TextElementLink } from './elements/link';
+import { TextElementMention } from './elements/mention';
+import { TextElementQuote } from './elements/quote';
+import { TextElementSearch } from './elements/search';
+import { TextElementTitle } from './elements/title';
+import { TextElementUrl } from './elements/url';
+
+const elements = [
+	require('./elements/bold'),
+	require('./elements/title'),
+	require('./elements/url'),
+	require('./elements/link'),
+	require('./elements/mention'),
+	require('./elements/hashtag'),
+	require('./elements/code'),
+	require('./elements/inline-code'),
+	require('./elements/quote'),
+	require('./elements/emoji'),
+	require('./elements/search')
+].map(element => element.default as TextElementProcessor);
+
+export type TextElement = { type: 'text', content: string }
+	| TextElementBold
+	| TextElementCode
+	| TextElementEmoji
+	| TextElementHashtag
+	| TextElementInlineCode
+	| TextElementLink
+	| TextElementMention
+	| TextElementQuote
+	| TextElementSearch
+	| TextElementTitle
+	| TextElementUrl;
+export type TextElementProcessor = (text: string, i: number) => TextElement | TextElement[];
+
+export default (source: string): TextElement[] => {
+
+	if (source == '') {
+		return null;
+	}
+
+	const tokens: TextElement[] = [];
+
+	function push(token: TextElement) {
+		if (token != null) {
+			tokens.push(token);
+			source = source.substr(token.content.length);
+		}
+	}
+
+	let i = 0;
+
+	// パース
+	while (source != '') {
+		const parsed = elements.some(el => {
+			let _tokens = el(source, i);
+			if (_tokens) {
+				if (!Array.isArray(_tokens)) {
+					_tokens = [_tokens];
+				}
+				_tokens.forEach(push);
+				return true;
+			} else {
+				return false;
+			}
+		});
+
+		if (!parsed) {
+			push({
+				type: 'text',
+				content: source[0]
+			});
+		}
+
+		i++;
+	}
+
+	// テキストを纏める
+	return tokens.reduce((a, b) => {
+		if (a.length && a[a.length - 1].type == 'text' && b.type == 'text') {
+			const tail = a.pop();
+			return a.concat({
+				type: 'text',
+				content: tail.content + b.content
+			});
+		} else {
+			return a.concat(b);
+		}
+	}, [] as TextElement[]);
+};