refactoring

Resolve #7779

packages/backend/src/mfm/to-html.ts

@@ -0,0 +1,153 @@
+import { JSDOM } from 'jsdom';
+import * as mfm from 'mfm-js';
+import config from '@/config/index';
+import { intersperse } from '@/prelude/array';
+import { IMentionedRemoteUsers } from '@/models/entities/note';
+
+export function toHtml(nodes: mfm.MfmNode[] | null, mentionedRemoteUsers: IMentionedRemoteUsers = []) {
+	if (nodes == null) {
+		return null;
+	}
+
+	const { window } = new JSDOM('');
+
+	const doc = window.document;
+
+	function appendChildren(children: mfm.MfmNode[], targetElement: any): void {
+		if (children) {
+			for (const child of children.map(x => (handlers as any)[x.type](x))) targetElement.appendChild(child);
+		}
+	}
+
+	const handlers: { [K in mfm.MfmNode['type']]: (node: mfm.NodeType<K>) => any } = {
+		bold(node) {
+			const el = doc.createElement('b');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		small(node) {
+			const el = doc.createElement('small');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		strike(node) {
+			const el = doc.createElement('del');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		italic(node) {
+			const el = doc.createElement('i');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		fn(node) {
+			const el = doc.createElement('i');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		blockCode(node) {
+			const pre = doc.createElement('pre');
+			const inner = doc.createElement('code');
+			inner.textContent = node.props.code;
+			pre.appendChild(inner);
+			return pre;
+		},
+
+		center(node) {
+			const el = doc.createElement('div');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		emojiCode(node) {
+			return doc.createTextNode(`\u200B:${node.props.name}:\u200B`);
+		},
+
+		unicodeEmoji(node) {
+			return doc.createTextNode(node.props.emoji);
+		},
+
+		hashtag(node) {
+			const a = doc.createElement('a');
+			a.href = `${config.url}/tags/${node.props.hashtag}`;
+			a.textContent = `#${node.props.hashtag}`;
+			a.setAttribute('rel', 'tag');
+			return a;
+		},
+
+		inlineCode(node) {
+			const el = doc.createElement('code');
+			el.textContent = node.props.code;
+			return el;
+		},
+
+		mathInline(node) {
+			const el = doc.createElement('code');
+			el.textContent = node.props.formula;
+			return el;
+		},
+
+		mathBlock(node) {
+			const el = doc.createElement('code');
+			el.textContent = node.props.formula;
+			return el;
+		},
+
+		link(node) {
+			const a = doc.createElement('a');
+			a.href = node.props.url;
+			appendChildren(node.children, a);
+			return a;
+		},
+
+		mention(node) {
+			const a = doc.createElement('a');
+			const { username, host, acct } = node.props;
+			const remoteUserInfo = mentionedRemoteUsers.find(remoteUser => remoteUser.username === username && remoteUser.host === host);
+			a.href = remoteUserInfo ? (remoteUserInfo.url ? remoteUserInfo.url : remoteUserInfo.uri) : `${config.url}/${acct}`;
+			a.className = 'u-url mention';
+			a.textContent = acct;
+			return a;
+		},
+
+		quote(node) {
+			const el = doc.createElement('blockquote');
+			appendChildren(node.children, el);
+			return el;
+		},
+
+		text(node) {
+			const el = doc.createElement('span');
+			const nodes = node.props.text.split(/\r\n|\r|\n/).map(x => doc.createTextNode(x));
+
+			for (const x of intersperse<FIXME | 'br'>('br', nodes)) {
+				el.appendChild(x === 'br' ? doc.createElement('br') : x);
+			}
+
+			return el;
+		},
+
+		url(node) {
+			const a = doc.createElement('a');
+			a.href = node.props.url;
+			a.textContent = node.props.url;
+			return a;
+		},
+
+		search(node) {
+			const a = doc.createElement('a');
+			a.href = `https://www.google.com/search?q=${node.props.query}`;
+			a.textContent = node.props.content;
+			return a;
+		}
+	};
+
+	appendChildren(nodes, doc.body);
+
+	return `<p>${doc.body.innerHTML}</p>`;
+}