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/*-----------------------------------------------------------------------
File : ccl_unit_simplify.h
Author: Stephan Schulz
Contents
Functions and datatypes for performing unit-cuts and
unit-simplifications with a mixed clause set where units are
indexed.
Copyright 1998-2011 by the author.
This code is released under the GNU General Public Licence and
the GNU Lesser General Public License.
See the file COPYING in the main E directory for details..
Run "eprover -h" for contact information.
Changes
<1> Sun Jun 23 01:34:49 CEST 2002
New
-----------------------------------------------------------------------*/
#ifndef CCL_UNIT_SIMPLIFY
#define CCL_UNIT_SIMPLIFY
#include <ccl_clausefunc.h>
#include <ccl_clausepos.h>
/*---------------------------------------------------------------------*/
/* Data type declarations */
/*---------------------------------------------------------------------*/
typedef enum
{
NoUnitSimplify, /* No unit simplification */
TopLevelUnitSimplify, /* Only on top level */
FullUnitSimplify /* Go down (with positive units only) */
}UnitSimplifyType;
typedef MatchResCell SimplifyRes;
extern const SimplifyRes SIMPLIFY_FAILED;
#define SimplifyFailed(res) ((res).pos == NULL)
/*---------------------------------------------------------------------*/
/* Exported Functions and Variables */
/*---------------------------------------------------------------------*/
extern char* UnitSimplifyNames[];
#define TransUnitSimplifyString(str) StringIndex((str), UnitSimplifyNames);
bool RemainingArgsSame(Term_p t1, Term_p t2, SimplifyRes *res);
SimplifyRes FindTopSimplifyingUnit(ClauseSet_p units, Term_p t1,
Term_p t2);
SimplifyRes FindSignedTopSimplifyingUnit(ClauseSet_p units, Term_p t1,
Term_p t2, bool sign);
SimplifyRes FindSimplifyingUnit(ClauseSet_p set, Term_p t1,
Term_p t2, bool positive_only);
bool ClauseSimplifyWithUnitSet(Clause_p clause, ClauseSet_p
unit_set, UnitSimplifyType how);
#endif
/*---------------------------------------------------------------------*/
/* End of File */
/*---------------------------------------------------------------------*/
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