123 lines
2.6 KiB
C++
123 lines
2.6 KiB
C++
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/**
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* projectM -- Milkdrop-esque visualisation SDK
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* Copyright (C)2003-2007 projectM Team
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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* See 'LICENSE.txt' included within this release
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*
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*/
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/**
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* $Id$
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*
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* Expression
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*
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* $Log$
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*/
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#ifndef _EXPR_H
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#define _EXPR_H
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#include "dlldefs.h"
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#include "CValue.hpp"
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class Param;
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#define CONST_STACK_ELEMENT 0
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#define EXPR_STACK_ELEMENT 1
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#define EVAL_ERROR -1
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/* Infix Operator Function */
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class InfixOp
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{
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public:
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int type;
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int precedence;
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InfixOp( int type, int precedence );
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};
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/** Term */
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class Term
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{
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public:
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float constant; /* static variable */
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Param *param; /* pointer to a changing variable */
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Term() { this->constant = 0; this->param = 0; }
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};
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/* General Expression Type */
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class GenExpr
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{
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public:
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int type;
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void * item;
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~GenExpr();
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GenExpr( int type, void *item );
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float eval_gen_expr(int mesh_i, int mesh_j);
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static GenExpr *const_to_expr( float val );
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static GenExpr *param_to_expr( Param *param );
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static GenExpr *prefun_to_expr( float (*func_ptr)(void *), GenExpr **expr_list, int num_args );
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};
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/* Value expression, contains a term union */
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class ValExpr
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{
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public:
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int type;
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Term term;
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~ValExpr();
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ValExpr( int type, Term *term );
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float eval_val_expr(int mesh_i, int mesh_j);
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};
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/* A binary expression tree ordered by operator precedence */
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class TreeExpr
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{
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public:
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InfixOp * infix_op; /* null if leaf */
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GenExpr * gen_expr;
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TreeExpr *left, *right;
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~TreeExpr();
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TreeExpr( InfixOp *infix_op, GenExpr *gen_expr,
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TreeExpr *left, TreeExpr *right );
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float eval_tree_expr(int mesh_i, int mesh_j);
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};
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/* A function expression in prefix form */
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class PrefunExpr
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{
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public:
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float (*func_ptr)(void*);
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int num_args;
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GenExpr **expr_list;
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PrefunExpr();
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~PrefunExpr();
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/* Evaluates functions in prefix form */
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float eval_prefun_expr(int mesh_i, int mesh_j);
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};
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#endif /** _EXPR_H */
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