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/**************************************************************/
/* ********************************************************** */
/* * * */
/* * SUBSTITUTION * */
/* * * */
/* * $Module: SUBSTITUTION * */
/* * * */
/* * Copyright (C) 1996, 1997, 1998, 1999, 2001 * */
/* * MPI fuer Informatik * */
/* * * */
/* * This program 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. * */
/* * * */
/* * 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 GNU General Public * */
/* * License for more details. * */
/* * * */
/* * You should have received a copy of the GNU General * */
/* * Public License along with this program; if not, write * */
/* * to the Free Software Foundation, Inc., 59 Temple * */
/* * Place, Suite 330, Boston, MA 02111-1307 USA * */
/* * * */
/* * * */
/* $Revision: 21527 $ * */
/* $State$ * */
/* $Date: 2005-04-24 21:10:28 -0700 (Sun, 24 Apr 2005) $ * */
/* $Author: duraid $ * */
/* * * */
/* * Contact: * */
/* * Christoph Weidenbach * */
/* * MPI fuer Informatik * */
/* * Stuhlsatzenhausweg 85 * */
/* * 66123 Saarbruecken * */
/* * Email: weidenb@mpi-sb.mpg.de * */
/* * Germany * */
/* * * */
/* ********************************************************** */
/**************************************************************/
/* $RCSfile$ */
#ifndef _SUBST_
#define _SUBST_
/**************************************************************/
/* Includes */
/**************************************************************/
#include "term.h"
#include "symbol.h"
#include "list.h"
/**************************************************************/
/* Data Structures */
/**************************************************************/
typedef struct subst {
struct subst *next;
SYMBOL dom;
TERM codomain;
} SUBST_NODE, *SUBST;
static __inline__ SUBST subst_Get(void)
{
return (SUBST) memory_Malloc(sizeof(SUBST_NODE));
}
static __inline__ void subst_FreeOneNode(SUBST SL)
{
memory_Free(SL, sizeof(SUBST_NODE));
}
/**************************************************************/
/* Include 'unify.h' after SUBST declaration. */
/**************************************************************/
#include "unify.h"
/**************************************************************/
/* Functions on Substitutions */
/**************************************************************/
static __inline__ SUBST subst_Nil(void)
{
return (SUBST)NULL;
}
static __inline__ BOOL subst_Exist(SUBST S)
{
return S != subst_Nil();
}
static __inline__ BOOL subst_Empty(SUBST S)
{
return S == subst_Nil();
}
static __inline__ SUBST subst_Next(SUBST S)
{
return S->next;
}
static __inline__ void subst_SetNext(SUBST S, SUBST N)
{
S->next = N;
}
static __inline__ SYMBOL subst_Dom(SUBST S)
{
return S->dom;
}
static __inline__ TERM subst_Cod(SUBST S)
{
return S->codomain;
}
static __inline__ SUBST subst_NUnion(SUBST S1,SUBST S2)
{
SUBST Result;
if (S1 == (SUBST)NULL)
return S2;
if (S2 == (SUBST)NULL)
return S1;
Result = S1;
for (; S1->next != (SUBST)NULL; S1 = S1->next);
S1->next = S2;
return Result;
}
/**************************************************************/
/* Functions for Creation and Deletion */
/**************************************************************/
SUBST subst_Add(SYMBOL, TERM, SUBST);
void subst_Delete(SUBST);
void subst_Free(SUBST);
/**************************************************************/
/* Functions for Applying and Copying */
/**************************************************************/
TERM subst_Term(SYMBOL, SUBST);
TERM subst_Apply(SUBST, TERM);
SUBST subst_Merge(SUBST, SUBST);
SUBST subst_Compose(SUBST, SUBST);
SUBST subst_Copy(SUBST);
BOOL subst_MatchTops(const CONTEXT, SUBST);
BOOL subst_BindVar(SYMBOL,SUBST);
/**************************************************************/
/* Functions for Search of Unifiers */
/**************************************************************/
BOOL subst_Unify(CONTEXT, SUBST);
BOOL subst_IsShallow(SUBST);
/**************************************************************/
/* Functions for Search of Generalizations */
/**************************************************************/
BOOL subst_Match(const CONTEXT, SUBST);
/**************************************************************/
/* Functions for Search of Instances */
/**************************************************************/
BOOL subst_MatchReverse(const CONTEXT, SUBST);
/**************************************************************/
/* Functions for Search of Variations */
/**************************************************************/
BOOL subst_Variation(const CONTEXT, SUBST);
/**************************************************************/
/* Functions for Computation of MSCGs */
/**************************************************************/
SUBST subst_ComGen(const CONTEXT, SUBST, SUBST*, SUBST*);
/**************************************************************/
/* Functions for Closing Bindings */
/**************************************************************/
void subst_CloseVariables(const CONTEXT, SUBST);
SUBST subst_CloseOpenVariables(SUBST);
/**************************************************************/
/* Functions for Extracting Substitutions from Bindings */
/**************************************************************/
void subst_ExtractUnifier(const CONTEXT, SUBST*, const CONTEXT, SUBST*);
void subst_ExtractUnifierCom(const CONTEXT, SUBST*);
SUBST subst_ExtractMatcher(void);
/**************************************************************/
/* Functions for Debugging */
/**************************************************************/
void subst_Print(SUBST);
#endif
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