Browser.hpp

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/*CXXR $Id: Browser.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 BROWSER_HPP
#define BROWSER_HPP 1

#include "CXXR/Evaluator_Context.hpp"
#include "CXXR/GCStackRoot.hpp"
#include "CXXR/RObject.h"

namespace CXXR {
    class Browser {
    public:
        Browser(RObject* the_text, RObject* the_condition)
            : m_text(the_text), m_condition(the_condition),
              m_context(Evaluator::Context::innermost())
        {
            s_browsers.push_back(this);
        }

        ~Browser()
        {
            s_browsers.pop_back();
        }

        static unsigned int numberActive()
        {
            return s_browsers.size();
        }

        RObject* condition() const
        {
            return m_condition;
        }

        Evaluator::Context* context() const
        {
            return m_context;
        }

        static Browser* fromOutermost(unsigned int i)
        {
            return s_browsers.at(i);
        }

        RObject* text() const
        {
            return m_text;
        }
    private:
        static std::vector<Browser*> s_browsers;
        GCStackRoot<> m_text;
        GCStackRoot<> m_condition;
        Evaluator::Context* m_context;
    };
}

#endif  // BROWSER_HPP