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TreeEval.hpp

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#ifndef IONFLUX_TOOLS_TREEEVAL
#define IONFLUX_TOOLS_TREEEVAL
/* ==========================================================================
 * Ionflux Tools
 * Copyright (c) 2004 Joern P. Meier
 * mail@ionflux.org
 * --------------------------------------------------------------------------
 * TreeEval.hpp                        Tree expression evaluator.
 * ==========================================================================
 * 
 * This file is part of Ionflux Tools.
 * 
 * Ionflux Tools 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 2 of the License, or (at  your option)
 * any later version.
 * 
 * Ionflux Tools 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 Ionflux Tools; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 * 
 * ========================================================================== */

#include <string>
#include <iostream>
#include <sstream>
#include <vector>
#include <stack>
#include <ionflux/tools.hpp>
#include <ionflux/Tokenizer.hpp>
#include <ionflux/Tree.hpp>
#include <ionflux/TreeResolver.hpp>

namespace Ionflux
{

namespace Tools
{

class Tree;
struct DataEntry;
struct TreeExprElement;

class TreeEval
{
    protected:
        static bool calculate(DataEntry &op1, DataEntry &result, 
            const std::string &op);
        
        static bool calculate(DataEntry &op1, DataEntry &op2, 
            DataEntry &result, const std::string &op);
        
        static bool unwindOpStack(std::stack<TreeExprElement> &ops, 
            std::stack<TreeExprElement> &values, Tree &temps, 
            bool unwindPar = false);
        
    public:
        static const TokenType TT_OPERATOR;
        static const TokenType TT_TREEPATH_NP;
        static const TokenType TT_PAR_LEFT;
        static const TokenType TT_PAR_RIGHT;
        
        TreeEval();
        
        virtual ~TreeEval();
        
        static bool parseTreeExpr(const std::string &treeExpr, 
            std::vector<TreeExprElement> &elements);
        
        static bool eval(Tree *tree, std::vector<TreeExprElement> &elements, 
            Node &result, bool createPath);
};

}

}

#endif

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