More refactoring to easily handle multiple renderers

ReactNativeClient/lib/renderers/MarkupToHtml.js

@@ -0,0 +1,35 @@
+const MdToHtml = require('./MdToHtml');
+const HtmlToHtml = require('./HtmlToHtml');
+const Note = require('lib/models/Note');
+
+class MarkupToHtml {
+
+	constructor(options) {
+		this.options_ = options;
+		this.renderers_ = {};
+	}
+
+	renderer(markupLanguage) {
+		if (this.renderers_[markupLanguage]) return this.renderers_[markupLanguage];
+
+		let RendererClass = null;
+
+		if (markupLanguage === Note.MARKUP_LANGUAGE_MARKDOWN) {
+			RendererClass = MdToHtml;
+		} else if (markupLanguage === Note.MARKUP_LANGUAGE_HTML) {
+			RendererClass = HtmlToHtml;
+		} else {
+			throw new Error('Invalid markup language: ' + markupLanguage);
+		}
+
+		this.renderers_[markupLanguage] = new RendererClass(this.options_);
+		return this.renderers_[markupLanguage];
+	}
+
+	render(markupLanguage, markup, theme, options) {
+		return this.renderer(markupLanguage).render(markup, theme, options);
+	}
+
+}
+
+module.exports = MarkupToHtml;