/**
 * projectM -- Milkdrop-esque visualisation SDK
 * Copyright (C)2003-2007 projectM Team
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser 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 library 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 Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 * See 'LICENSE.txt' included within this release
 *
 */
/**
 * $Id$
 *
 * Expression evaluators
 *
 * $Log$
 */

/* Eval.hpp: evaluation functions of expressions */

#ifndef __EVAL_H
#define __EVAL_H

#include "fatal.h"
//#include "projectM.hpp"
#include "Func.hpp"
#include "Param.hpp"


#define EVAL_DEBUG      0
//#define EVAL_DEBUG_DOUBLE 2

#define VAL_T           1
#define PREFUN_T        3
#define TREE_T          4
#define NONE_T          0

#define CONSTANT_TERM_T 0
#define PARAM_TERM_T    1

#define INFIX_ADD       0
#define INFIX_MINUS     1
#define INFIX_MOD       2
#define INFIX_DIV       3
#define INFIX_MULT      4
#define INFIX_OR        5
#define INFIX_AND       6


class DLLEXPORT InfixOp;


class Eval {
public:
  static InfixOp *infix_add,
                 *infix_minus,
                 *infix_div,
                 *infix_mult,
                 *infix_or,
                 *infix_and,
                 *infix_mod,
                 *infix_negative,
                 *infix_positive;

  float eval_gen_expr(GenExpr * gen_expr);
  inline GenExpr * opt_gen_expr(GenExpr * gen_expr, int ** param_list);

  GenExpr * const_to_expr(float val);
  GenExpr * param_to_expr(Param * param);
  GenExpr * prefun_to_expr(float (*func_ptr)(), GenExpr ** expr_list, int num_args);

  static TreeExpr * new_tree_expr(InfixOp * infix_op, GenExpr * gen_expr, TreeExpr * left, TreeExpr * right);
  static GenExpr * new_gen_expr(int type, void * item);
  static ValExpr * new_val_expr(int type, Term *term);

  static InfixOp * new_infix_op(int type, int precedence);
  static int init_infix_ops();
  static int destroy_infix_ops();
  void reset_engine_vars();

  GenExpr * clone_gen_expr(GenExpr * gen_expr);
  TreeExpr * clone_tree_expr(TreeExpr * tree_expr);
  ValExpr * clone_val_expr(ValExpr * val_expr);
  PrefunExpr * clone_prefun_expr(PrefunExpr * prefun_expr);
};

#endif /** !_EVAL_H */