commandreader.h

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/*---------------------------------------------------------------------+
 * File: commandreader.h
 * Project: part of belofte - A Promising Chess Program
 * Author: yves
 * SPDX-License-Identifier: GPL-2.0-only
+----------------------------------------------------------------------*/
 
#if !defined(COMMANDREADER_H)
#define COMMANDREADER_H
 
//-----------------------------------------------------------------------
 
class noCommandException : public std::exception
{
  const char * what () const noexcept override
    { return "No command"; }
};
 
//-----------------------------------------------------------------------
 
#if defined(__GNUC__)
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Weffc++"
#endif
 
class commandReader {
public:
  commandReader()
    : m_filename{}
    {}
  ~commandReader()
    { if (isFileAttached())
      detach();
    }
 
  // no copy or move ctor nor assignment defined
  commandReader(commandReader const&) = delete;
  commandReader(commandReader&&) = delete;
  commandReader& operator=(commandReader const&) = delete;
  commandReader& operator=(commandReader&&) = delete;
 
  bool attach(std::string const& ifile);
  void detach();
 
  bool isFileAttached()
    { if (m_filename == "") return false;
      if (!m_inputfile) return false;
      if (m_inputfile.eof()) detach();
      return m_inputfile.is_open();
    }
  bool isBatchMode()
    { // no interactive input, mainly during start and '@' execute
      if (isFileAttached()) return true;
      return m_isBatch;
    }
  void setBatchMode()
    { m_isBatch = true; }
  void clearBatchMode()
    { m_isBatch = false; }
 
  cmdParam getCommand();
  void runner();
 
private:
  std::string readLine();
 
  std::string m_filename;
  std::ifstream m_inputfile;
  bool m_isBatch = true;
};
 
#if defined(__GNUC__)
#pragma GCC diagnostic pop
#endif
 
//-----------------------------------------------------------------------
 
#endif // defined COMMANDREADER_H
 
// eof