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/*
* This file is part of the source code of the software program
* Vampire. It is protected by applicable
* copyright laws.
*
* This source code is distributed under the licence found here
* https://vprover.github.io/license.html
* and in the source directory
*/
/**
* @file NNF.hpp
* Defines NNF-related transformations.
* @since 28/12/2003 Manchester
* @since 27/06/2007 Flight Frankfurt-Paris, changed to use new data structures
*/
#ifndef __NNF__
#define __NNF__
#include "Forwards.hpp"
using namespace Kernel;
namespace Shell {
/**
* Class implementing NNF-related procedures.
*/
class NNF
{
public:
static FormulaUnit* ennf(FormulaUnit* unit);
static FormulaUnit* nnf(FormulaUnit* unit);
static Formula* ennf(Formula*, bool polarity);
private:
static Literal* ennf(Literal*);
static TermList ennf(TermList, bool polarity);
static FormulaList* ennf(FormulaList*, bool polarity);
static Formula* nnf(Formula*, bool polarity);
static FormulaList* nnf(FormulaList*, bool polarity);
}; // class NNF
}
#endif