/*
 * This file is part of Tocc. (see <https://tocc.aidinhut.com>)
 * Copyright (C) 2013, 2014, Aidin Gharibnavaz <tocc@aidinhut.com>
 *
 * Tocc 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.
 *
 * Tocc 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 Tocc.  If not, see <http://www.gnu.org/licenses/>.
 */

#ifndef LIBTOCC_EXPR_H_INCLUDED
#define LIBTOCC_EXPR_H_INCLUDED

namespace libtocc
{

  /*
   * Defines base of all expressions.
   */

  /*
   * Types of expressions available.
   */
  namespace expr_type
  {
    enum ExprType { CONNECTIVE, FUNCTION, OPERATION, FIELD };
  }

  /*
   * Abstract base class for all the expressions.
   */
  class Expr
  {
    // To allow these classes delete a pointer to Expr.
    friend class ConnectiveExpr;

  public:

    virtual ~Expr() {}

    /*
     * Returns the type of the expression.
     */
    virtual expr_type::ExprType get_type() = 0;

    /*
     * Returns a deep copy of this instance.
     */
    virtual Expr* clone() = 0;

  };

};

#endif /* LIBTOCC_EXPR_H_INCLUDED */
