Bold and italic support

markdown.js

@@ -90,6 +90,70 @@ class Heading extends Symbol {
   }
 }
 
+class Italic extends Symbol {
+  /**
+   * @type {string}
+   */
+  text = "";
+  /**
+   *
+   * @param {string} line
+   * @returns {boolean}
+   */
+  static canParse(line) {
+    const trimmedLine = line.trim();
+    return trimmedLine.startsWith("_") && trimmedLine.endsWith("_");
+  }
+
+  /**
+   *
+   * @param {LineFeed} lineFeed
+   * @returns {Symbol}
+   */
+  static create(lineFeed) {
+    const instance = new Italic();
+    const line = lineFeed.claim().trim();
+    const lineWithoutUnderscores = line.slice(1, line.length - 1);
+    instance.text = lineWithoutUnderscores;
+    return instance;
+  }
+  render() {
+    return `<i>${this.text}</i>`;
+  }
+}
+
+class Bold extends Symbol {
+  /**
+   * @type {string}
+   */
+  text = "";
+  /**
+   *
+   * @param {string} line
+   * @returns {boolean}
+   */
+  static canParse(line) {
+    const trimmedLine = line.trim();
+    return trimmedLine.startsWith("**") && trimmedLine.endsWith("**");
+  }
+
+  /**
+   *
+   * @param {LineFeed} lineFeed
+   * @returns {Symbol}
+   */
+  static create(lineFeed) {
+    const instance = new Bold();
+    const line = lineFeed.claim().trim();
+    const lineWithoutUnderscores = line.slice(2, line.length - 2);
+    instance.text = lineWithoutUnderscores;
+    return instance;
+  }
+  render() {
+    return `<b>${this.text}</b>`;
+  }
+}
+
 class CatchAll extends Symbol {
   /**
    * @type {string}
@@ -119,7 +183,7 @@ class CatchAll extends Symbol {
   }
 }
 
-const Factories = [Heading, CatchAll];
+const Factories = [Heading, Bold, Italic, CatchAll];
 
 export const toHtml = (markdown) => {
   const symbols = toSymbols(markdown);