using maddy for markdown parsing

maddy/emphasizedparser.h

@@ -0,0 +1,54 @@
+/*
+ * This project is licensed under the MIT license. For more information see the
+ * LICENSE file.
+ */
+#pragma once
+
+// -----------------------------------------------------------------------------
+
+#include <regex>
+#include <string>
+
+#include "maddy/lineparser.h"
+
+// -----------------------------------------------------------------------------
+
+namespace maddy {
+
+// -----------------------------------------------------------------------------
+
+/**
+ * EmphasizedParser
+ *
+ * Has to be used after the `StrongParser`.
+ *
+ * @class
+ */
+class EmphasizedParser : public LineParser
+{
+public:
+  /**
+   * Parse
+   *
+   * From Markdown: `text _text_`
+   *
+   * To HTML: `text <em>text</em>`
+   *
+   * @method
+   * @param {std::string&} line The line to interpret
+   * @return {void}
+   */
+  void Parse(std::string& line) override
+  {
+    static std::regex re(
+      R"((?!.*`.*|.*<code>.*)_(?!.*`.*|.*<\/code>.*)([^_]*)_(?!.*`.*|.*<\/code>.*))"
+    );
+    static std::string replacement = "<em>$1</em>";
+
+    line = std::regex_replace(line, re, replacement);
+  }
+}; // class EmphasizedParser
+
+// -----------------------------------------------------------------------------
+
+} // namespace maddy