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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 CNF.hpp
* Defines class CNF implementing CNF transformation.
* @since 19/01/2004 Manchester
* @since 27/12/2007 Manchester, changed completely to a new implementation
*/
#ifndef __CNF__
#define __CNF__
#include "Lib/Stack.hpp"
namespace Kernel {
class Formula;
class FormulaUnit;
class Clause;
class Unit;
class Literal;
};
using namespace Lib;
using namespace Kernel;
namespace Shell {
/**
* Class implementing the CNF transformation.
* @since 19/01/2004 Manchester
*/
class CNF
{
public:
CNF();
void clausify (Unit*,Stack<Clause*>& stack);
private:
void clausify(Formula*);
// the original recurisive version (for documentation and reference)
// void clausify_rec(Formula*);
/** The unit currently being processed */
FormulaUnit* _unit;
/** stack to collect the results */
Stack<Clause*>* _result;
/** stack of literals collected so far */
Stack <Literal*> _literals;
/** stack of formulas */
Stack <Formula*> _formulas;
}; // class CNF
}
#endif