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/**************************************************************/
/* ********************************************************** */
/* * * */
/* * RESOLUTION * */
/* * * */
/* * $Module: RESOLUTION * */
/* * * */
/* * Copyright (C) 1996, 1997, 1998, 2001 * */
/* * MPI fuer Informatik * */
/* * * */
/* * This program is free software; you can redistribute * */
/* * it and/or modify it under the terms of the FreeBSD * */
/* * Licence. * */
/* * * */
/* * This program 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 LICENCE file * */
/* * for more details. * */
/* * * */
/* * * */
/* $Revision: 1.2 $ * */
/* $State: Exp $ * */
/* $Date: 2010-02-22 14:09:59 $ * */
/* $Author: weidenb $ * */
/* * * */
/* * Contact: * */
/* * Christoph Weidenbach * */
/* * MPI fuer Informatik * */
/* * Stuhlsatzenhausweg 85 * */
/* * 66123 Saarbruecken * */
/* * Email: spass@mpi-inf.mpg.de * */
/* * Germany * */
/* * * */
/* ********************************************************** */
/**************************************************************/
/* $RCSfile: resolution.c,v $ */
#include "resolution.h"
/**************************************************************/
/* Functions */
/**************************************************************/
void res_InsertClauseIndex(CLAUSE clause, st_INDEX stindex)
/**********************************************************
INPUT: A st_INDEX and a clause.
RETURNS: Inserts the clause in the st_INDEX stindex.
CAUTION: None.
***********************************************************/
{
int n,j;
n = clause_Length(clause);
for (j = 0; j < n; j++)
st_EntryCreate(stindex,
clause_GetLiteral(clause,j),
clause_GetLiteralTerm(clause,j),
cont_LeftContext());
}
void res_DeleteClauseIndex(CLAUSE clause, st_INDEX stindex)
/**********************************************************
INPUT: A st_INDEX and a clause.
RETURNS: Deletes the clause from the st_INDEX stindex.
CAUTION: None.
***********************************************************/
{
int n, j;
n = clause_Length(clause);
for (j = 0; j < n; j++)
if (!st_EntryDelete(stindex,
clause_GetLiteral(clause,j),
clause_GetLiteralTerm(clause,j),
cont_LeftContext()))
misc_DumpCore();
}
CLAUSE res_SelectLightestClause(LIST clauselist)
/**********************************************************
INPUT: A list of clauses.
RETURNS: The lightest clause of the clauselist.
CAUTION: None.
***********************************************************/
{
CLAUSE clause;
LIST scan;
int min;
clause = list_Car(clauselist);
min = clause_Weight(clause);
for (scan=list_Cdr(clauselist); !list_Empty(scan); scan=list_Cdr(scan)) {
if (clause_Weight(list_Car(scan)) < min) {
clause = list_Car(scan);
min = clause_Weight(clause);
}
}
return clause;
}
BOOL res_HasTautology(CLAUSE clause)
/**********************************************************
INPUT: A clauses.
RETURNS: TRUE if the clause contains a complementary
literal pair and FALSE otherwise.
CAUTION: None.
***********************************************************/
{
BOOL found;
TERM literal1;
int i, j, n;
found = FALSE;
n = clause_Length(clause);
for (i = 0; i < n && !found; i++) {
literal1 = fol_ComplementaryTerm(clause_GetLiteralTerm(clause,i));
for (j = 0; j < n && !found; j++)
if (j != i && term_Equal(literal1, clause_GetLiteralTerm(clause,j)))
found = TRUE;
term_Delete(literal1);
}
return found;
}
BOOL res_BackSubWithLength(CLAUSE clause, st_INDEX stindex)
/**********************************************************
INPUT: A clauses and an index.
RETURNS: TRUE if a clause of the index subsumes the clause clause
and length(clause) >= length(clause of index).
CAUTION: None.
***********************************************************/
{
int n,i;
LIST scan,generals;
TERM term;
LITERAL litres;
n = clause_Length(clause);
for (i = 0; i < n; i++) {
term = clause_GetLiteralTerm(clause,i);
generals = st_GetGen(cont_LeftContext(), stindex, term);
for (scan = generals; !list_Empty(scan); scan = list_Cdr(scan)) {
litres = (LITERAL) list_Car(scan);
if (litres == clause_GetLiteral(clause_LiteralOwningClause(litres),0) &&
clause_Length(clause) >= clause_Length(clause_LiteralOwningClause(litres)) &&
clause_Weight(clause) >= clause_Weight(clause_LiteralOwningClause(litres)) &&
subs_Idc(clause_LiteralOwningClause(litres),clause)) {
list_Delete(generals);
return TRUE;
}
}
list_Delete(generals);
}
return FALSE;
}
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