libaegis/aer/expr.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_EXPR_H
#define AEGIS_AER_EXPR_H

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

#include <libaegis/aer/pos.h>
#include <libaegis/aer/value.h>


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

    virtual ~rpt_expr();

protected:
    rpt_expr();

public:
    void parse_error(const char *fmt) const;

    void append(const rpt_expr::pointer &child);

    void prepend(const rpt_expr::pointer &child);

    rpt_value::pointer evaluate(bool undefer, bool dereference) const;

    size_t get_nchildren() const { return nchild; }

    rpt_position::pointer get_pos() const { return pos; }

    void pos_from_lex();

    void pos_from(const rpt_expr::pointer &other);

protected:
    virtual rpt_value::pointer evaluate() const = 0;

public:
    virtual bool lvalue() const;

    rpt_expr::pointer nth_child(size_t n) const;

private:
    rpt_position::pointer pos;

    rpt_expr::pointer *child;

    size_t nchild;

    size_t nchild_max;

    rpt_expr(const rpt_expr &);

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

#endif // AEGIS_AER_EXPR_H