initial commit

fluxer_api/src/utils/DOMUtils.ts

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+/*
+ * Copyright (C) 2026 Fluxer Contributors
+ *
+ * This file is part of Fluxer.
+ *
+ * Fluxer is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Fluxer is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with Fluxer. If not, see <https://www.gnu.org/licenses/>.
+ */
+
+import {decode} from 'html-entities';
+export function decodeHTMLEntities(html?: string | null): string {
+	if (!html) return '';
+	return decode(html);
+}
+export function stripHtmlTags(html?: string | null): string {
+	if (!html) return '';
+	return html.replace(/<[^>]*>/g, '');
+}
+export function htmlToMarkdown(html?: string | null): string {
+	if (!html) return '';
+	let md = html
+		.replace(/<p>/gi, '\n\n')
+		.replace(/<\/p>/gi, '')
+		.replace(/<br\s*\/?>/gi, '\n')
+		.replace(/<h[1-6]>/gi, '\n\n**')
+		.replace(/<\/h[1-6]>/gi, '**\n\n')
+		.replace(/<li>/gi, '• ')
+		.replace(/<\/li>/gi, '\n')
+		.replace(/<ul>|<ol>/gi, '\n')
+		.replace(/<\/ul>|<\/ol>/gi, '\n')
+		.replace(/<pre><code>([\s\S]*?)<\/code><\/pre>/gi, (_, code) => `\`\`\`\n${code}\n\`\`\``)
+		.replace(/<code>([\s\S]*?)<\/code>/gi, '`$1`')
+		.replace(/<strong>([\s\S]*?)<\/strong>/gi, '**$1**')
+		.replace(/<b>([\s\S]*?)<\/b>/gi, '**$1**')
+		.replace(/<em>([\s\S]*?)<\/em>/gi, '_$1_')
+		.replace(/<i>([\s\S]*?)<\/i>/gi, '_$1_')
+		.replace(/<a\s+(?:[^>]*?\s+)?href="([^"]*)"[^>]*>([\s\S]*?)<\/a>/gi, '[$2]($1)');
+	md = stripHtmlTags(md);
+	md = decodeHTMLEntities(md);
+	return md
+		.replace(/\n{3,}/g, '\n\n')
+		.replace(/\s+$/, '')
+		.trim();
+}