Moved the Joplin renderer back to the main repository to make development easier

ReactNativeClient/lib/joplin-renderer/htmlUtils.js

@@ -0,0 +1,50 @@
+const Entities = require('html-entities').AllHtmlEntities;
+const htmlentities = new Entities().encode;
+
+// [\s\S] instead of . for multiline matching
+// https://stackoverflow.com/a/16119722/561309
+const imageRegex = /<img([\s\S]*?)src=["']([\s\S]*?)["']([\s\S]*?)>/gi;
+
+class HtmlUtils {
+
+	attributesHtml(attr) {
+		const output = [];
+
+		for (const n in attr) {
+			if (!attr.hasOwnProperty(n)) continue;
+			output.push(`${n}="${htmlentities(attr[n])}"`);
+		}
+
+		return output.join(' ');
+	}
+
+	processImageTags(html, callback) {
+		if (!html) return '';
+
+		return html.replace(imageRegex, (v, before, src, after) => {
+			const action = callback({ src: src });
+
+			if (!action) return `<img${before}src="${src}"${after}>`;
+
+			if (action.type === 'replaceElement') {
+				return action.html;
+			}
+
+			if (action.type === 'replaceSource') {
+				return `<img${before}src="${action.src}"${after}>`;
+			}
+
+			if (action.type === 'setAttributes') {
+				const attrHtml = this.attributesHtml(action.attrs);
+				return `<img${before}${attrHtml}${after}>`;
+			}
+
+			throw new Error(`Invalid action: ${action.type}`);
+		});
+	}
+
+}
+
+const htmlUtils = new HtmlUtils();
+
+module.exports = htmlUtils;