commandreader.cpp

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/*---------------------------------------------------------------------+
 * File: commandreader.cpp
 * Project: part of belofte - A Promising Chess Program
 * Author: yves
 * SPDX-License-Identifier: GPL-2.0-only
+----------------------------------------------------------------------*/
 
#include "belofte.h"
 
//-----------------------------------------------------------------------
 
void commandReader::runner()
{
  while (true) {
    if (!isFileAttached()) AppEI()->sendPrompt();
    try {
      cmdParam cmd = App().m_reader.getCommand();
      AppEI()->execute(cmd.m_command, cmd.m_args);
    } catch (const quitCommandException&) {
      // quit requested
      break;
    } catch (const noCommandException&) {
      // skip comments and empty lines
    } catch (...) { throw; // push other exceptions down
    }
  }
}
 
std::string commandReader::readLine()
{
  std::string line;
 
  while (line.empty()) {
    if (!isFileAttached()) {
      if (!std::getline(std::cin, line)) throw noCommandException();
    } else {
      if (!std::getline(m_inputfile, line)) {
        detach();
        break;
      }
    }
    if (!line.empty()) {
      /// @todo output to attached file only
      if ((line[0] == '#')
          || (line[0] == '=')
          || (line[0] == ';')) line = "";
    }
  }
 
  return line;
}
 
cmdParam commandReader::getCommand()
{
  std::string line = readLine();
  cmdParam cmd;
 
  if (line == "__END__") {
    detach();
  } else if (!line.empty()) {
    std::stringstream ss(line);
    std::getline(ss, cmd.m_command, ' ');
    std::getline(ss, cmd.m_args);
 
    /// @attention Bughouse moves use @ character as well
    if ((cmd.m_command.substr(0,1) == "@") && (cmd.m_command.length() > 1)) {
      // @file passed, move file to arg and truncate command
      cmd.m_args = cmd.m_command.substr(1);
      cmd.m_command = "@";
    }
  }
 
  return cmd;
}
 
bool commandReader::attach(std::string const& ifile)
{
  m_filename = ifile;
  m_inputfile.open(m_filename.c_str(), std::ios_base::in);
  return isFileAttached();
}
 
void commandReader::detach()
{
  m_inputfile.close();
  m_filename = "";
}
 
//-----------------------------------------------------------------------
 
// eof