--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/3rdparty/maddy/orderedlistparser.h	Tue Aug 17 11:19:54 2021 +0200
@@ -0,0 +1,142 @@
+/*
+ * This project is licensed under the MIT license. For more information see the
+ * LICENSE file.
+ */
+#pragma once
+
+// -----------------------------------------------------------------------------
+
+#include <functional>
+#include <regex>
+#include <string>
+
+#include "maddy/blockparser.h"
+
+// -----------------------------------------------------------------------------
+
+namespace maddy {
+
+// -----------------------------------------------------------------------------
+
+/**
+ * OrderedListParser
+ *
+ * @class
+ */
+class OrderedListParser : public BlockParser
+{
+public:
+  /**
+   * ctor
+   *
+   * @method
+   * @param {std::function<void(std::string&)>} parseLineCallback
+   * @param {std::function<std::shared_ptr<BlockParser>(const std::string& line)>} getBlockParserForLineCallback
+   */
+   OrderedListParser(
+    std::function<void(std::string&)> parseLineCallback,
+    std::function<std::shared_ptr<BlockParser>(const std::string& line)> getBlockParserForLineCallback
+  )
+    : BlockParser(parseLineCallback, getBlockParserForLineCallback)
+    , isStarted(false)
+    , isFinished(false)
+  {}
+
+  /**
+   * IsStartingLine
+   *
+   * An ordered list starts with `1. `.
+   *
+   * @method
+   * @param {const std::string&} line
+   * @return {bool}
+   */
+  static bool
+  IsStartingLine(const std::string& line)
+  {
+    static std::regex re("^1\\. .*");
+    return std::regex_match(line, re);
+  }
+
+  /**
+   * IsFinished
+   *
+   * @method
+   * @return {bool}
+   */
+  bool
+  IsFinished() const override
+  {
+    return this->isFinished;
+  }
+
+protected:
+  bool
+  isInlineBlockAllowed() const override
+  {
+    return true;
+  }
+
+  bool
+  isLineParserAllowed() const override
+  {
+    return true;
+  }
+
+  void
+  parseBlock(std::string& line) override
+  {
+    bool isStartOfNewListItem = this->isStartOfNewListItem(line);
+    uint32_t indentation = getIndentationWidth(line);
+
+    static std::regex orderedlineRegex("^[1-9]+[0-9]*\\. ");
+    line = std::regex_replace(line, orderedlineRegex, "");
+    static std::regex unorderedlineRegex("^\\* ");
+    line = std::regex_replace(line, unorderedlineRegex, "");
+
+    if (!this->isStarted)
+    {
+      line = "<ol><li>" + line;
+      this->isStarted = true;
+      return;
+    }
+
+    if (indentation >= 2)
+    {
+      line = line.substr(2);
+      return;
+    }
+
+    if (
+      line.empty() ||
+      line.find("</li><li>") != std::string::npos ||
+      line.find("</li></ol>") != std::string::npos ||
+      line.find("</li></ul>") != std::string::npos
+    )
+    {
+      line = "</li></ol>" + line;
+      this->isFinished = true;
+      return;
+    }
+
+    if (isStartOfNewListItem)
+    {
+      line = "</li><li>" + line;
+    }
+  }
+
+private:
+  bool isStarted;
+  bool isFinished;
+
+  bool
+  isStartOfNewListItem(const std::string& line) const
+  {
+    static std::regex re("^(?:[1-9]+[0-9]*\\. |\\* ).*");
+    return std::regex_match(line, re);
+  }
+}; // class OrderedListParser
+
+// -----------------------------------------------------------------------------
+
+} // namespace maddy