Program Listing for File SimpleEval.h

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/************************************************************************
 * Copyright 2008, Strathclyde Planning Group,
 * Department of Computer and Information Sciences,
 * University of Strathclyde, Glasgow, UK
 * http://planning.cis.strath.ac.uk/
 *
 * Maria Fox, Richard Howey and Derek Long - VAL
 * Stephen Cresswell - PDDL Parser
 *
 * This file is part of VAL, the PDDL validator.
 *
 * VAL 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.
 *
 * VAL 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 VAL.  If not, see <http://www.gnu.org/licenses/>.
 *
 ************************************************************************/

#ifndef __SIMPLE_EVALUATOR
#define __SIMPLE_EVALUATOR
#include "VisitController.h"
#include "FastEnvironment.h"
#include <map>
#include <vector>
#include <set>
#include <ptree.h>

namespace VAL {

    class TypeChecker;

};

namespace Inst {

typedef std::set<VAL::pred_symbol *> IState0Arity;
typedef std::map<VAL::pred_symbol *,vector<VAL::parameter_symbol_list*> > IState;



class PrimitiveEvaluator {
protected:
    bool & valueTrue;
    bool & unknownTrue;
    bool & valueFalse;
    bool & unknownFalse;

public:
    PrimitiveEvaluator(bool & xt,bool & yt, bool & xf,bool & yf) : valueTrue(xt), unknownTrue(yt), valueFalse(xf), unknownFalse(yf) {};
    virtual ~PrimitiveEvaluator() {};
    virtual void evaluateSimpleGoal(VAL::FastEnvironment * f,VAL::simple_goal * s)
    {
        unknownTrue = true;
        unknownFalse = true;
    };
};

template<typename PE>
class PrimitiveEvaluatorConstructor {
public:
    PrimitiveEvaluator * operator()(bool & v,bool & u, bool & w, bool & x)
    {
        return new PE(v,u,w,x);
    }
};


class InitialStateEvaluator : public PrimitiveEvaluator {
protected:
    friend class ParameterDomainConstraints;
    friend class LitStoreEvaluator;
    static IState initState;
    static IState0Arity init0State;
public:
    InitialStateEvaluator(bool & v,bool & u, bool & w, bool & x):
        PrimitiveEvaluator(v,u,w,x)
    {};
    static void setInitialState();
    virtual void evaluateSimpleGoal(VAL::FastEnvironment * f,VAL::simple_goal * s);
};

typedef PrimitiveEvaluatorConstructor<InitialStateEvaluator> ISC;

class SimpleEvaluator : public VAL::VisitController {
protected:
    bool valueTrue;
    bool unknownTrue;
    bool valueFalse;
    bool unknownFalse;

    VAL::TypeChecker * tc;
    VAL::FastEnvironment * f;


    VAL::pred_symbol * const equality;

    bool isFixed;
    bool undefined;
    double nvalue; // Used for numeric values.
    bool isDuration;

    PrimitiveEvaluator * const primev;

public:

    static bool verbose;

    template<typename PEC>
    SimpleEvaluator(VAL::TypeChecker * const tcIn, VAL::FastEnvironment * const ff,PrimitiveEvaluatorConstructor<PEC> pec) : valueTrue(true), unknownTrue(false), valueFalse(false), unknownFalse(false), tc(tcIn), f(ff),
        equality(VAL::current_analysis->pred_tab.symbol_probe("=")),
        primev(pec(valueTrue,unknownTrue,valueFalse,unknownFalse))
    {};

    ~SimpleEvaluator() {delete primev;};

    bool reallyTrue() const
    {
        return !unknownTrue && valueTrue;
    };
    bool reallyFalse() const
    {
        //return !unknownTrue && !valueTrue;
        return !unknownFalse && valueFalse;
    };

    void prepareForVisit(VAL::FastEnvironment * const ff) {
        f = ff;
        valueTrue = true;
        unknownTrue = false;
        valueFalse = false;
        unknownFalse = false;
    }

    static void setInitialState() {InitialStateEvaluator::setInitialState();};

    virtual void visit_simple_goal(VAL::simple_goal *);
    virtual void visit_qfied_goal(VAL::qfied_goal *);
    virtual void visit_conj_goal(VAL::conj_goal *);
    virtual void visit_disj_goal(VAL::disj_goal *);
    virtual void visit_timed_goal(VAL::timed_goal *);
    virtual void visit_imply_goal(VAL::imply_goal *);
    virtual void visit_neg_goal(VAL::neg_goal *);
    virtual void visit_comparison(VAL::comparison *);
    virtual void visit_preference(VAL::preference *);
    virtual void visit_event(VAL::event * e);
    virtual void visit_process(VAL::process * p);
    virtual void visit_action(VAL::action * o);
    virtual void visit_derivation_rule(VAL::derivation_rule * o);
    virtual void visit_durative_action(VAL::durative_action * da);
    bool equiv(const VAL::parameter_symbol_list *,const VAL::parameter_symbol_list *);

    virtual void visit_plus_expression(VAL::plus_expression * s);
    virtual void visit_minus_expression(VAL::minus_expression * s);
    virtual void visit_mul_expression(VAL::mul_expression * s);
    virtual void visit_div_expression(VAL::div_expression * s);
    virtual void visit_uminus_expression(VAL::uminus_expression * s);
    virtual void visit_int_expression(VAL::int_expression * s);
    virtual void visit_float_expression(VAL::float_expression * s);
    virtual void visit_special_val_expr(VAL::special_val_expr * s);
    virtual void visit_func_term(VAL::func_term * s);



};


};

#endif