aefind/tree.h

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//
//      aegis - project change supervisor
//      Copyright (C) 1997, 2002, 2004-2008 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 AEFIND_TREE_H
#define AEFIND_TREE_H

#include <common/ac/shared_ptr.h>
#include <libaegis/aer/value.h>

struct string_ty; // existence
struct stat; // existence

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

    virtual ~tree();

protected:
    tree();

public:
    virtual const char *name() const = 0;
    virtual void print() const = 0;
    virtual rpt_value::pointer evaluate(string_ty *, string_ty *, string_ty *,
        struct stat *) const = 0;
    virtual bool useful() const = 0;
    virtual bool constant() const = 0;
    virtual tree::pointer optimize() const = 0;

    rpt_value::pointer evaluate_constant() const;
    tree::pointer optimize_constant() const;

private:
    tree(const tree &);

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


#endif // AEFIND_TREE_H