rcpp_framework/libs/maddy/quoteparser.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 {

// -----------------------------------------------------------------------------

/**
 * QuoteParser
 *
 * @class
 */
class QuoteParser : public BlockParser
{
public:
  /**
   * ctor
   *
   * @method
   * @param {std::function<void(std::string&)>} parseLineCallback
   * @param {std::function<std::shared_ptr<BlockParser>(const std::string& line)>} getBlockParserForLineCallback
   */
   QuoteParser(
    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
   *
   * A quote starts with `> `.
   *
   * @method
   * @param {const std::string&} line
   * @return {bool}
   */
  static bool
  IsStartingLine(const std::string& line)
  {
    static std::regex re("^\\>.*");
    return std::regex_match(line, re);
  }

  /**
   * AddLine
   *
   * Adding a line which has to be parsed.
   *
   * @method
   * @param {std::string&} line
   * @return {void}
   */
  void
  AddLine(std::string& line) override
  {
    if (!this->isStarted)
    {
      this->result << "<blockquote>";
      this->isStarted = true;
    }

    bool finish = false;
    if (line.empty())
    {
      finish = true;
    }

    this->parseBlock(line);

    if (this->isInlineBlockAllowed() && !this->childParser)
    {
      this->childParser = this->getBlockParserForLine(line);
    }

    if (this->childParser)
    {
      this->childParser->AddLine(line);

      if (this->childParser->IsFinished())
      {
        this->result << this->childParser->GetResult().str();
        this->childParser = nullptr;
      }

      return;
    }

    if (this->isLineParserAllowed())
    {
      this->parseLine(line);
    }

    if (finish)
    {
      this->result << "</blockquote>";
      this->isFinished = true;
    }

    this->result << line;
  }

  /**
   * 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
  {
    static std::regex lineRegexWithSpace("^\\> ");
    line = std::regex_replace(line, lineRegexWithSpace, "");
    static std::regex lineRegexWithoutSpace("^\\>");
    line = std::regex_replace(line, lineRegexWithoutSpace, "");

    if (!line.empty())
    {
      line += " ";
    }
  }

private:
  bool isStarted;
  bool isFinished;
}; // class QuoteParser

// -----------------------------------------------------------------------------

} // namespace maddy