libaegis/aer/stmt.h

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//
//      aegis - project change supervisor
//      Copyright (C) 1994, 1996, 2002-2008 Peter Miller
//
//      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 3 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 General Public License for more details.
//
//      You should have received a copy of the GNU General Public License
//      along with this program. If not, see
//      <http://www.gnu.org/licenses/>.
//

#ifndef AEGIS_AER_STMT_H
#define AEGIS_AER_STMT_H

#include <common/ac/shared_ptr.h>
#include <common/ac/stddef.h>

#include <libaegis/aer/value.h>

enum rpt_stmt_status_ty
{
    rpt_stmt_status_normal,
    rpt_stmt_status_break,
    rpt_stmt_status_continue,
    rpt_stmt_status_return,
    rpt_stmt_status_error
};

struct rpt_stmt_result_ty
{
    rpt_stmt_status_ty status;
    rpt_value::pointer thrown;
};


class rpt_stmt
{
public:
    typedef aegis_shared_ptr<rpt_stmt> pointer;

    virtual ~rpt_stmt();

protected:
    rpt_stmt();

public:
    virtual void run(rpt_stmt_result_ty *) const = 0;

    void append(const pointer &child);

    void prepend(const pointer &child);

    size_t get_nchildren() const { return nchild; }

protected:
    pointer nth_child(size_t n) const;

private:
    pointer *child;

    size_t nchild;

    size_t nchild_max;

    rpt_stmt(const rpt_stmt &);

    rpt_stmt &operator=(const rpt_stmt &);
};

#endif // AEGIS_AER_STMT_H