rcpp_framework/libs/maddy/orderedlistparser.h

/*
 * 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