VirtualMachine.h

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/*
  Copyright (C) 2008 National Institute For Space Research (INPE) - Brazil.

  This file is part of the TerraLib - a Framework for building GIS enabled
  applications.

  TerraLib is free software: you can redistribute it and/or modify
  it under the terms of the GNU Lesser General Public License as published by
  the Free Software Foundation, either version 3 of the License,
  or (at your option) any later version.

  TerraLib is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  GNU Lesser General Public License for more details.

  You should have received a copy of the GNU Lesser General Public License
  along with TerraLib. See COPYING. If not, write to
  TerraLib Team at <terralib-team@terralib.org>.
 */

/*!
  \file terralib/vm/python/VirtualMachine.h

  \brief Implementation of a virtual machine for the Python Programming
  Language.

  \author Frederico Augusto Bedê
*/

#ifndef __TERRALIB_VM_PYTHON_VIRTUALMACHINE_H__
#define __TERRALIB_VM_PYTHON_VIRTUALMACHINE_H__

// TerraLib
#include "../core/VirtualMachine.h"

// STL
#include <iostream> // workaround because of python
// Python
#undef slots  // python conflicts with qt #define slots
#ifdef _DEBUG
#undef _DEBUG
#include <Python.h>
#define _DEBUG
#else
#include <Python.h>
#endif
#define slots Q_SLOTS  // redefine slots

// Boost
#include <boost/python.hpp>

#include <QEventLoop>

namespace te
{
  namespace vm
  {
    namespace python
    {
      class VirtualMachineInput
      {
       public:
        VirtualMachineInput(te::vm::core::VirtualMachine* vm = nullptr);
        std::string readline();

       private:
        te::vm::core::VirtualMachine* m_vm;
      };

      class VirtualMachineOutput
      {
       public:
        VirtualMachineOutput(te::vm::core::VirtualMachine* vm = nullptr);
        void write(const std::string& str);

       private:
        te::vm::core::VirtualMachine* m_vm;
      };

      class VirtualMachine : public te::vm::core::VirtualMachine
      {
        Q_OBJECT

       public:
        VirtualMachine();

        ~VirtualMachine();

        std::string getName() const;

        std::string getTitle() const;

        std::string getDescription() const;

        void setFileName(QString file);

        std::string readline();

       public slots:
        void write(const QString& str);
        void stop();
        void execute();
        void readline(QString msg);

       private:
        std::string m_filename;
        VirtualMachineInput m_stdin;
        VirtualMachineOutput m_stdout;
        VirtualMachineOutput m_stderr;
        std::string m_readlineStr;
        PyThreadState* m_mainThreadState;
        QEventLoop* m_readlineLoop;
      };

    } // end namespace python
  }   // end namespace vm
}     // end namespace te

#endif  // __TERRALIB_VM_PYTHON_VIRTUALMACHINE_H__