Evaluator_Context.hpp

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/*CXXR $Id: Evaluator_Context.hpp 1348 2013-02-25 17:49:03Z arr $
 *CXXR
 *CXXR This file is part of CXXR, a project to refactor the R interpreter
 *CXXR into C++.  It may consist in whole or in part of program code and
 *CXXR documentation taken from the R project itself, incorporated into
 *CXXR CXXR (and possibly MODIFIED) under the terms of the GNU General Public
 *CXXR Licence.
 *CXXR 
 *CXXR CXXR is Copyright (C) 2008-13 Andrew R. Runnalls, subject to such other
 *CXXR copyrights and copyright restrictions as may be stated below.
 *CXXR 
 *CXXR CXXR is not part of the R project, and bugs and other issues should
 *CXXR not be reported via r-bugs or other R project channels; instead refer
 *CXXR to the CXXR website.
 *CXXR */

/*
 *  R : A Computer Language for Statistical Data Analysis
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2.1 of the License, or
 *  (at your option) any later version.
 *
 *  This program 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 General Public License
 *  along with this program; if not, a copy is available at
 *  http://www.r-project.org/Licenses/
 */

#ifndef CONTEXT_HPP
#define CONTEXT_HPP 1

#include "CXXR/Evaluator.h"

namespace CXXR {
    class Evaluator::Context {
    public:
        enum Type {
            BAILOUT = 0, 
            PLAIN,       
            FUNCTION,    
            CLOSURE      
        };

        ~Context()
        {
            Evaluator::setDepth(m_eval_depth);
            Evaluator::current()->m_innermost_context = m_next_out;
        }

        static Context* innermost()
        {
            return Evaluator::current()->innermostContext();
        }

        Context* nextOut() const
        {
            return m_next_out;
        }

        Type type() const
        {
            return m_type;
        }
    protected:
        Context()
            : m_next_out(innermost()), m_eval_depth(Evaluator::depth())
        {
            Evaluator::current()->m_innermost_context = this;
        }

        void setType(Type the_type)
        {
            m_type = the_type;
        }
    private:
        Context *m_next_out;
        unsigned int m_eval_depth;
        Type m_type;
    };
}  // namespace CXXR

extern "C" {
    void Rf_jump_to_toplevel(void);
}

#endif  // CONTEXT_HPP