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sort.c
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/**************************************************************/
/* ********************************************************** */
/* * * */
/* * SORTED REASONING * */
/* * * */
/* * $Module: SORT * */
/* * * */
/* * Copyright (C) 1996, 1997, 1998, 1999, 2000, 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 * */
/* * * */
/* * * */
/* $Revision$ * */
/* $State$ * */
/* $Date$ * */
/* $Author$ * */
/* * * */
/* * Contact: * */
/* * Christoph Weidenbach * */
/* * MPI fuer Informatik * */
/* * Stuhlsatzenhausweg 85 * */
/* * 66123 Saarbruecken * */
/* * Email: weidenb@mpi-sb.mpg.de * */
/* * Germany * */
/* * * */
/* ********************************************************** */
/**************************************************************/
/* $RCSfile$ */
#include "sort.h"
/**************************************************************/
/* Global Variables */
/**************************************************************/
/**************************************************************/
/* ********************************************************** */
/* * * */
/* * HIGH LEVEL FUNCTIONS * */
/* * * */
/* ********************************************************** */
/**************************************************************/
void sort_Delete(SORT Sort)
/**************************************************************
INPUT: A sort.
RETURNS: Nothing.
MEMORY: The memory of the sort is freed.
***************************************************************/
{
list_Delete(Sort);
}
BOOL sort_Eq(SORT S1, SORT S2)
/**************************************************************
INPUT: Two sorts.
RETURNS: TRUE iff the sorts <S1> and <S2> are the same base
sort intersection
***************************************************************/
{
LIST Scan1,Scan2;
BOOL Found;
#ifdef CHECK
if (!sort_IsSort(S1) || !sort_IsSort(S2)) {
misc_StartErrorReport();
misc_ErrorReport("\n In sort_Eq :");
misc_ErrorReport(" Illegal input.\n");
misc_FinishErrorReport();
}
#endif
if (list_Length(S1) != list_Length(S2))
return FALSE;
for (Scan1=S1; !list_Empty(Scan1); Scan1=list_Cdr(Scan1)) {
Found = FALSE;
for (Scan2=S2; !list_Empty(Scan2) && !Found; Scan2=list_Cdr(Scan2))
Found = sort_NodeEqual(list_Car(Scan1),list_Car(Scan2));
if (!Found)
return FALSE;
}
return TRUE;
}
LIST sort_GetSymbolsFromSort(SORT Sort)
/**************************************************************
INPUT: A sort.
RETURNS: The list of sort symbols..
***************************************************************/
{
LIST result = list_Nil();
for ( ; !list_Empty(Sort); Sort = list_Cdr(Sort))
result = list_Cons((POINTER)sort_NodeSymbol(list_Car(Sort)), result);
return result;
}
BOOL sort_ContainsSymbol(SORT Sort, SYMBOL Symbol)
/**************************************************************
INPUT: A sort and a symbol.
RETURNS: TRUE, if the sort contains the symbol, FALSE otherwise.
***************************************************************/
{
for ( ; !list_Empty(Sort); Sort = list_Cdr(Sort))
if (symbol_Equal(sort_NodeSymbol(list_Car(Sort)), Symbol))
return TRUE;
return FALSE;
}
BOOL sort_IsSort(SORT Sort)
/**************************************************************
INPUT: A sort.
RETURNS: TRUE, if the sort contains not more than one node.
***************************************************************/
{
LIST Scan1,Scan2;
for (Scan1=Sort ; !list_Empty(Scan1); Scan1 = list_Cdr(Scan1))
for (Scan2=list_Cdr(Scan1) ; !list_Empty(Scan2); Scan2 = list_Cdr(Scan2))
if (sort_NodeEqual(list_Car(Scan1),list_Car(Scan2)))
return FALSE;
return TRUE;
}
BOOL sort_TheorySortEqual(SORTTHEORY Theory, SORT Sort1, SORT Sort2)
/**************************************************************
INPUT:
RETURNS:
***************************************************************/
{
LIST Scan;
if (list_Length(Sort1) != list_Length(Sort2))
return FALSE;
sort_TheoryIncrementMark(Theory);
for (Scan=Sort1; !list_Empty(Scan); Scan=list_Cdr(Scan))
sort_PutNodeExtraTrue(Theory,list_Car(Scan));
for (Scan=Sort2; !list_Empty(Scan); Scan=list_Cdr(Scan))
if (!sort_NodeExtraValue(Theory,list_Car(Scan)))
return FALSE;
return TRUE;
}
static BOOL sort_TheorySortMember(SORTTHEORY Theory, LIST List, SORT Sort)
/**************************************************************
INPUT:
RETURNS:
***************************************************************/
{
while (!list_Empty(List)) {
if (sort_TheorySortEqual(Theory,list_Car(List),Sort))
return TRUE;
List = list_Cdr(List);
}
return FALSE;
}
void sort_DeleteSortPair(SOJU Pair)
/**************************************************************
INPUT:
RETURNS: Nothing.
***************************************************************/
{
sort_DeleteOne(sort_PairSort(Pair));
sort_ConditionDelete(sort_PairCondition(Pair));
list_PairFree(Pair);
}
static void sort_ConditionPrint(CONDITION Cond)
/**************************************************************
INPUT:
RETURNS: Nothing.
***************************************************************/
{
LIST Scan;
symbol_Print(sort_ConditionVar(Cond));
for (Scan=sort_ConditionConstraint(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
putchar(',');
term_PrintPrefix(list_Car(Scan));
}
for (Scan=sort_ConditionAntecedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
putchar(',');
term_PrintPrefix(list_Car(Scan));
}
for (Scan=sort_ConditionSuccedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
putchar(',');
term_PrintPrefix(list_Car(Scan));
}
for (Scan=sort_ConditionClauses(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
printf(",%d",clause_Number(list_Car(Scan)));
}
}
static void sort_LinkPrint(SLINK Link)
/**************************************************************
INPUT:
RETURNS: Nothing.
***************************************************************/
{
LIST Scan;
fputs("Input: (", stdout);
for (Scan=sort_LinkInput(Link);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
symbol_Print(sort_NodeSymbol(list_Car(Scan)));
if (!list_Empty(list_Cdr(Scan)))
putchar(',');
}
fputs(") Output: ", stdout);
symbol_Print(sort_NodeSymbol(sort_LinkOutput(Link)));
fputs(" C: (", stdout);
for (Scan=sort_LinkConstraint(Link);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
term_PrintPrefix(list_Car(Scan));
if (!list_Empty(list_Cdr(Scan)))
putchar(',');
}
fputs(") A: (", stdout);
for (Scan=sort_LinkAntecedent(Link);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
term_PrintPrefix(list_Car(Scan));
if (!list_Empty(list_Cdr(Scan)))
putchar(',');
}
fputs(") S: (", stdout);
for (Scan=sort_LinkSuccedent(Link);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
term_PrintPrefix(list_Car(Scan));
if (!list_Empty(list_Cdr(Scan)))
putchar(',');
}
printf(") Clause: %d Card: %d Fire: %d Var: ", clause_Number(sort_LinkClause(Link)), sort_LinkCard(Link),
sort_LinkFire(Link));
symbol_Print(sort_LinkVar(Link));
}
void sort_PairPrint(SOJU Pair)
/**************************************************************
INPUT:
RETURNS: Nothing.
***************************************************************/
{
sort_Print(sort_PairSort(Pair));
fputs(":[", stdout);
sort_ConditionPrint(sort_PairCondition(Pair));
putchar(']');
}
static NODE sort_NodeCreate(SYMBOL S)
/**************************************************************
INPUT: A sort symbol.
RETURNS: A new initialized sort node for the symbol <S>.
***************************************************************/
{
NODE Result;
Result = (NODE)memory_Malloc(sizeof(NODE_NODE));
sort_PutNodeLinks(Result, list_Nil());
sort_PutNodeConditions(Result, list_Nil());
sort_PutNodeMark(Result, 0);
sort_PutNodeStart(Result, 0);
sort_PutNodeExtra(Result, 0);
sort_PutNodeSymbol(Result, S);
return Result;
}
BOOL sort_NodeIsTop(SORTTHEORY Theory, NODE Node)
/**************************************************************
INPUT: A sort theory and a node.
RETURNS: TRUE if the Node is declared to be equivalent to the
top sort.
***************************************************************/
{
LIST Scan;
SLINK Link;
for (Scan=sort_TheorySuborigcls(Theory);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Link = (SLINK)list_Third(list_Car(Scan));
if (list_Empty(sort_LinkInput(Link)) && Node == sort_LinkOutput(Link))
return TRUE;
}
return FALSE;
}
static SLINK sort_TheoryLinkCreate(SORTTHEORY Theory, CLAUSE Origin,
CLAUSE Clause, LITERAL Lit)
/**************************************************************
INPUT: A sort theory, a clause its origin and a subsort declaration
literal in the clause
RETURNS: A new link in <Theory> origin <Clause> and subsort declaration <Lit>
***************************************************************/
{
SLINK Result;
SYMBOL Output,Var,Max;
int i;
LIST Input, Antecedent, Succedent, Constraint;
TERM Term;
Result = (SLINK)memory_Malloc(sizeof(SLINK_NODE));
Output = term_TopSymbol(clause_LiteralSignedAtom(Lit));
Var = term_TopSymbol(term_FirstArgument(clause_LiteralSignedAtom(Lit)));
Input = Antecedent = Succedent = Constraint = list_Nil();
Max = clause_MaxVar(Clause);
term_StartMaxRenaming(Max);
Max = symbol_CreateStandardVariable();
for (i = clause_FirstConstraintLitIndex(Clause);
i <= clause_LastConstraintLitIndex(Clause); i++)
if (symbol_Equal(Var,term_TopSymbol(term_FirstArgument(clause_GetLiteralAtom(Clause,i)))))
Input = list_Cons(sort_TheoryNode(Theory,term_TopSymbol(clause_GetLiteralAtom(Clause,i))),
Input);
else {
Term = term_Copy(clause_GetLiteralTerm(Clause,i));
term_ExchangeVariable(Term,Var,Max);
Constraint = list_Cons(Term,Constraint);
}
for (i = clause_FirstAntecedentLitIndex(Clause);
i <= clause_LastAntecedentLitIndex(Clause); i++) {
Term = term_Copy(clause_GetLiteralTerm(Clause,i));
term_ExchangeVariable(Term,Var,Max);
Antecedent = list_Cons(Term,Antecedent);
}
for (i = clause_FirstSuccedentLitIndex(Clause);
i <= clause_LastSuccedentLitIndex(Clause); i++)
if (clause_GetLiteral(Clause,i) != Lit) {
Term = term_Copy(clause_GetLiteralTerm(Clause,i));
term_ExchangeVariable(Term,Var,Max);
Succedent = list_Cons(Term,Succedent);
}
sort_PutLinkInput(Result,Input);
sort_PutLinkOutput(Result,sort_TheoryNode(Theory,Output));
sort_PutLinkVar(Result,Max);
sort_PutLinkConstraint(Result,Constraint);
sort_PutLinkAntecedent(Result,Antecedent);
sort_PutLinkSuccedent(Result,Succedent);
sort_PutLinkCard(Result,list_Length(Input));
sort_LinkResetFire(Result);
sort_PutLinkClause(Result,Origin);
while (!list_Empty(Input)) {
sort_PutNodeLinks(list_Car(Input),list_Cons(Result,sort_NodeLinks(list_Car(Input))));
Input = list_Cdr(Input);
}
return Result;
}
void sort_Init(void)
/**************************************************************
INPUT: None.
RETURNS: None.
SUMMARY: Initializes the sort Module.
EFFECTS: Initializes global variables, i.e. the BASESORT-Array.
CAUTION: MUST BE CALLED BEFORE ANY OTHER sort-FUNCTION.
***************************************************************/
{
return;
}
void sort_Print(SORT Sort)
/**************************************************************
INPUT:
RETURNS: Nothing.
***************************************************************/
{
putchar('(');
while (!list_Empty(Sort)) {
symbol_Print(sort_NodeSymbol(list_Car(Sort)));
Sort = list_Cdr(Sort);
if (!list_Empty(Sort))
putchar(',');
}
putchar(')');
}
void sort_Free(void)
/**************************************************************
INPUT: None.
RETURNS: Nothing.
SUMMARY: Frees the sort Module.
***************************************************************/
{
return;
}
SORTTHEORY sort_TheoryCreate(void)
/**************************************************************
INPUT: None.
RETURNS: A new sort theory.
EFFECT: A new sort theory is created and initialized.
***************************************************************/
{
SORTTHEORY Result;
int i;
SIGNATURE Entry;
SYMBOL Symbol;
Result = (SORTTHEORY)memory_Malloc(sizeof(SORTTHEORY_NODE));
for (i = 1; i < symbol_ACTINDEX; i++) {
Result->basesorttable[i] = (NODE)NULL;
Entry = symbol_Signature(i);
if (Entry != NULL) {
Symbol = Entry->info;
if (symbol_IsPredicate(Symbol) && Entry->arity == 1)
Result->basesorttable[i] = sort_NodeCreate(Symbol);
}
}
Result->index = st_IndexCreate();
Result->suborigcls = list_Nil();
Result->termorigcls = list_Nil();
Result->mark = 0;
return Result;
}
void sort_TheoryPrint(SORTTHEORY Theory)
/**************************************************************
INPUT: A sort theory
RETURNS: None.
EFFECT: Prints the sort theory to stdout.
***************************************************************/
{
LIST Scan;
if (Theory == (SORTTHEORY)NULL) {
fputs(" Empty Theory", stdout);
return;
}
fputs("\n Subsort Clauses:", stdout);
for (Scan=sort_TheorySuborigcls(Theory);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
fputs("\n\t\t Clause:", stdout);
clause_Print(list_Second(list_Car(Scan)));
fputs("\n\t\t Link: ", stdout);
sort_LinkPrint(list_Third(list_Car(Scan)));
}
fputs("\n Term Declaration Clauses:", stdout);
for (Scan=sort_TheoryTermorigcls(Theory);!list_Empty(Scan);Scan=list_Cdr(Scan)) {
fputs("\n\t\t Clause:", stdout);
clause_Print(list_Second(list_Car(Scan)));
}
}
void sort_TheoryDelete(SORTTHEORY Theory)
/**************************************************************
INPUT: A sort theory
RETURNS: None.
EFFECT: The complete sort theory is deleted.
***************************************************************/
{
if (Theory != (SORTTHEORY)NULL) {
int i;
LIST Scan,Tuple;
TERM Term, Atom;
for (Scan=Theory->suborigcls;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Tuple = (LIST)list_Car(Scan);
sort_LinkDelete(list_Third(Tuple));
clause_Delete(list_Second(Tuple));
list_Delete(Tuple);
}
list_Delete(Theory->suborigcls);
for (Scan=Theory->termorigcls;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Tuple = (LIST)list_Car(Scan);
Term = (TERM)list_Third(Tuple);
Atom = (TERM)list_Car(term_SupertermList(Term));
st_EntryDelete(Theory->index,Term,Term,cont_LeftContext());
st_EntryDelete(Theory->index,Atom,Atom,cont_LeftContext());
list_Delete(term_SupertermList(Atom));
list_Delete(term_SupertermList(Term));
term_RplacSupertermList(Term, list_Nil());
term_RplacSupertermList(Atom, list_Nil());
clause_Delete(list_Second(Tuple));
list_Delete(Tuple);
}
list_Delete(Theory->termorigcls);
st_IndexDelete(Theory->index);
for (i=1;i<symbol_ACTINDEX;i++)
if (Theory->basesorttable[i] != (NODE)NULL)
sort_NodeDelete(Theory->basesorttable[i]);
memory_Free(Theory,sizeof(SORTTHEORY_NODE));
}
}
void sort_TheoryInsertClause(SORTTHEORY Theory, CLAUSE Origin, CLAUSE Clause, LITERAL L)
/**************************************************************
INPUT: A sort theory, two clauses and a declaration of the second clause.
<Origin> is the original clause and <Clause> is a possibly approximated
copy of <Origin>.
RETURNS: None.
EFFECT: Inserts <Clause> with declaration <L> into the sort theory.
***************************************************************/
{
TERM Term, Atom;
Term = term_FirstArgument(clause_LiteralSignedAtom(L));
if (term_IsVariable(Term)) {
SLINK Link;
Link = sort_TheoryLinkCreate(Theory,Origin,Clause,L);
Theory->suborigcls = list_Cons(list_Cons(Origin,list_Cons(clause_Copy(Clause),list_List(Link))),
Theory->suborigcls);
}
/* Since currently Sort Resolution and Empty Sort require the subsort declaration clauses */
/* also subsort clauses are introduced into the sort theory index */
Atom = clause_LiteralSignedAtom(L);
term_RplacSupertermList(Atom, list_List(L));
term_RplacSupertermList(Term, list_List(Atom)); /* Must be empty before this operation */
st_EntryCreate(Theory->index,Term,Term,cont_LeftContext());
st_EntryCreate(Theory->index,Atom,Atom,cont_LeftContext());
Theory->termorigcls = list_Cons(list_Cons(Origin,list_Cons(Clause,list_List(Term))),
Theory->termorigcls);
}
void sort_TheoryDeleteClause(SORTTHEORY Theory, CLAUSE Origin)
/**************************************************************
INPUT: A sort theory and a clause possibly inserted several times in the theory.
RETURNS: None.
EFFECT: <Origin> is deleted from the sort theory, but not deleted itself.
***************************************************************/
{
TERM Term,Atom;
LIST Scan,Tuple;
for (Scan=Theory->suborigcls;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Tuple = list_Car(Scan);
if ((CLAUSE)list_First(Tuple) == Origin) {
list_Rplaca(Scan,NULL);
sort_LinkDelete(list_Third(Tuple));
clause_Delete(list_Second(Tuple));
list_Delete(Tuple);
}
}
Theory->suborigcls = list_PointerDeleteElement(Theory->suborigcls,NULL);
for (Scan=Theory->termorigcls;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Tuple = list_Car(Scan);
if ((CLAUSE)list_First(Tuple) == Origin) {
list_Rplaca(Scan,NULL);
Term = (TERM)list_Third(Tuple);
Atom = (TERM)list_Car(term_SupertermList(Term));
st_EntryDelete(Theory->index,Term,Term,cont_LeftContext());
st_EntryDelete(Theory->index,Atom,Atom,cont_LeftContext());
list_Delete(term_SupertermList(Atom));
list_Delete(term_SupertermList(Term));
term_RplacSupertermList(Term, list_Nil());
term_RplacSupertermList(Atom, list_Nil());
clause_Delete(list_Second(Tuple));
list_Delete(Tuple);
}
}
Theory->termorigcls = list_PointerDeleteElement(Theory->termorigcls,NULL);
}
CONDITION sort_ConditionCreate(SYMBOL Var, LIST Constr, LIST Ante, LIST Succ, LIST Clauses)
/**************************************************************
INPUT: A variable, a list of constraint literals, antecedent literals, succedent literals
and a list of clauses.
RETURNS: The condition created from these arguments.
MEMORY: It is assumed that all literals are unshared whereas the clauses are shared.
***************************************************************/
{
CONDITION Result;
Result = (CONDITION)memory_Malloc(sizeof(CONDITION_NODE));
sort_ConditionPutVar(Result, Var);
sort_ConditionPutConstraint(Result, Constr);
sort_ConditionPutAntecedent(Result, Ante);
sort_ConditionPutSuccedent(Result, Succ);
sort_ConditionPutClauses(Result, Clauses);
return Result;
}
CONDITION sort_ConditionNormalize(CONDITION Cond)
/**************************************************************
INPUT: A condition.
RETURNS: The normalized condition, i.e., the variables for the various
literals are normalized starting with the minimal variable.
EFFECT: Destructive.
***************************************************************/
{
LIST Scan;
SYMBOL Old,New;
term_StartMinRenaming();
for (Scan=sort_ConditionConstraint(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_Rename(list_Car(Scan));
for (Scan=sort_ConditionAntecedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_Rename(list_Car(Scan));
for (Scan=sort_ConditionSuccedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_Rename(list_Car(Scan));
New = symbol_CreateStandardVariable();
Old = term_GetRenamedVarSymbol(sort_ConditionVar(Cond));
for (Scan=sort_ConditionConstraint(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_ExchangeVariable(list_Car(Scan),Old,New);
for (Scan=sort_ConditionAntecedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_ExchangeVariable(list_Car(Scan),Old,New);
for (Scan=sort_ConditionSuccedent(Cond);!list_Empty(Scan);Scan=list_Cdr(Scan))
term_ExchangeVariable(list_Car(Scan),Old,New);
sort_ConditionPutVar(Cond,New);
return Cond;
}
CONDITION sort_ConditionCreateNoResidues(LIST Clauses)
/**************************************************************
INPUT: A list of clauses.
RETURNS: The condition created just from the clauses.
***************************************************************/
{
CONDITION Result;
Result = (CONDITION)memory_Malloc(sizeof(CONDITION_NODE));
sort_ConditionPutVar(Result, symbol_FirstVariable());
sort_ConditionPutConstraint(Result, list_Nil());
sort_ConditionPutAntecedent(Result, list_Nil());
sort_ConditionPutSuccedent(Result, list_Nil());
sort_ConditionPutClauses(Result, Clauses);
return Result;
}
CONDITION sort_ExtendConditionByLink(CONDITION Cond, SLINK Link)
/**************************************************************
INPUT: A condition and a link.
RETURNS: <Cond> extended by the clause, antecedent, constraint and succedent
literals of <Link>
EFFECT: <Cond> is destructively extended with <Link>.
***************************************************************/
{
LIST Lits,Antecedent,Succedent,Constraint;
SYMBOL Old,New;
term_StartMaxRenaming(sort_ConditionVar(Cond));
Constraint = term_CopyTermList(sort_LinkConstraint(Link));
Antecedent = term_CopyTermList(sort_LinkAntecedent(Link));
Succedent = term_CopyTermList(sort_LinkSuccedent(Link));
for (Lits=Constraint;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Antecedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Succedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
Old = term_GetRenamedVarSymbol(sort_LinkVar(Link));
New = symbol_CreateStandardVariable();
for (Lits=Constraint;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Antecedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Succedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
Old = sort_ConditionVar(Cond);
for (Lits=sort_ConditionConstraint(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=sort_ConditionAntecedent(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=sort_ConditionSuccedent(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
sort_ConditionPutConstraint(Cond,list_Nconc(sort_ConditionConstraint(Cond),Constraint));
sort_ConditionPutAntecedent(Cond,list_Nconc(sort_ConditionAntecedent(Cond),Antecedent));
sort_ConditionPutSuccedent(Cond,list_Nconc(sort_ConditionSuccedent(Cond),Succedent));
sort_ConditionPutClauses(Cond,list_Cons(sort_LinkClause(Link),sort_ConditionClauses(Cond)));
sort_ConditionPutVar(Cond,New);
sort_ConditionNormalize(Cond);
return Cond;
}
CONDITION sort_ExtendConditionByCondition(CONDITION Cond, CONDITION Update)
/**************************************************************
INPUT: Two conditions.
RETURNS: <Cond> extended by the clauses, antecedent, constraint and succedent
literals of <Update>
EFFECT: <Cond> is destructively extended by <Update>.
***************************************************************/
{
LIST Lits,Antecedent,Succedent,Constraint;
SYMBOL Old,New;
term_StartMaxRenaming(sort_ConditionVar(Cond));
Constraint = term_CopyTermList(sort_ConditionConstraint(Update));
Antecedent = term_CopyTermList(sort_ConditionAntecedent(Update));
Succedent = term_CopyTermList(sort_ConditionSuccedent(Update));
for (Lits=Constraint;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Antecedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Succedent;!list_Empty(Lits);Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
Old = term_GetRenamedVarSymbol(sort_ConditionVar(Update));
New = symbol_CreateStandardVariable();
for (Lits=Constraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Antecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Succedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
Old = sort_ConditionVar(Cond);
for (Lits=sort_ConditionConstraint(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=sort_ConditionAntecedent(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=sort_ConditionSuccedent(Cond);!list_Empty(Lits);Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
sort_ConditionPutConstraint(Cond,list_Nconc(sort_ConditionConstraint(Cond),Constraint));
sort_ConditionPutAntecedent(Cond,list_Nconc(sort_ConditionAntecedent(Cond),Antecedent));
sort_ConditionPutSuccedent(Cond,list_Nconc(sort_ConditionSuccedent(Cond),Succedent));
sort_ConditionPutClauses(Cond,list_Nconc(list_Copy(sort_ConditionClauses(Update)),
sort_ConditionClauses(Cond)));
sort_ConditionPutVar(Cond,New);
sort_ConditionNormalize(Cond);
return Cond;
}
LIST sort_ExtendConditions(LIST Conditions, SLINK Link)
/**************************************************************
INPUT: A list of conditions and a link.
RETURNS: A new list of conditions augmented by the conditions in <Link>.
***************************************************************/
{
LIST Result,Scan,Antecedent,Succedent,Constraint;
CONDITION Cond;
Result = list_Nil();
for (Scan=Conditions;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Cond = (CONDITION)list_Car(Scan);
Constraint = term_CopyTermList(sort_ConditionConstraint(Cond));
Antecedent = term_CopyTermList(sort_ConditionAntecedent(Cond));
Succedent = term_CopyTermList(sort_ConditionSuccedent(Cond));
if (sort_LinkNoResidues(Link))
Result = list_Cons(sort_ConditionCreate(sort_ConditionVar(Cond),Constraint,Antecedent,
Succedent,list_Cons(sort_LinkClause(Link),
list_Copy(sort_ConditionClauses(Cond)))),
Result);
else {
SYMBOL New,Old;
LIST NewAntecedent,NewSuccedent,NewConstraint,Lits;
term_StartMaxRenaming(sort_ConditionVar(Cond));
NewConstraint = term_CopyTermList(sort_LinkConstraint(Link));
NewAntecedent = term_CopyTermList(sort_LinkAntecedent(Link));
NewSuccedent = term_CopyTermList(sort_LinkSuccedent(Link));
for (Lits=NewConstraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=NewAntecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=NewSuccedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
Old = term_GetRenamedVarSymbol(sort_LinkVar(Link));
New = symbol_CreateStandardVariable();
for (Lits=NewConstraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=NewAntecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=NewSuccedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
Old = sort_ConditionVar(Cond);
for (Lits=Constraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Antecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Succedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
Result = list_Cons(sort_ConditionNormalize(sort_ConditionCreate(New,list_Nconc(Constraint,NewConstraint),
list_Nconc(Antecedent,NewAntecedent),
list_Nconc(Succedent,NewSuccedent),
list_Cons(sort_LinkClause(Link),
list_Copy(sort_ConditionClauses(Cond))))),
Result);
}
}
return Result;
}
CONDITION sort_ConditionsUnion(LIST Conditions)
/**************************************************************
INPUT: A list of conditions.
RETURNS: A new condition that is the union of all input conditions.
***************************************************************/
{
LIST Scan,Antecedent,Succedent,Constraint;
CONDITION Cond;
SYMBOL Act,New,Old;
LIST NewAntecedent,NewSuccedent,NewConstraint,NewClauses,Lits;
if (list_Empty(Conditions))
return sort_ConditionCreate(symbol_FirstVariable(),list_Nil(),list_Nil(),list_Nil(),
list_Nil());
else {
Cond = (CONDITION)list_Car(Conditions);
Conditions = list_Cdr(Conditions);
Act = sort_ConditionVar(Cond);
NewConstraint = term_CopyTermList(sort_ConditionConstraint(Cond));
NewAntecedent = term_CopyTermList(sort_ConditionAntecedent(Cond));
NewSuccedent = term_CopyTermList(sort_ConditionSuccedent(Cond));
NewClauses = list_Copy(sort_ConditionClauses(Cond));
}
for (Scan=Conditions;!list_Empty(Scan);Scan=list_Cdr(Scan)) {
Cond = (CONDITION)list_Car(Scan);
if (!sort_ConditionNoResidues(Cond)) {
Constraint = term_CopyTermList(sort_ConditionConstraint(Cond));
Antecedent = term_CopyTermList(sort_ConditionAntecedent(Cond));
Succedent = term_CopyTermList(sort_ConditionSuccedent(Cond));
term_StartMaxRenaming(Act);
for (Lits=Constraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Antecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
for (Lits=Succedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_Rename(list_Car(Lits));
Old = term_GetRenamedVarSymbol(sort_ConditionVar(Cond));
New = symbol_CreateStandardVariable();
for (Lits=Constraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Antecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=Succedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Old,New);
for (Lits=NewConstraint; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Act,New);
for (Lits=NewAntecedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Act,New);
for (Lits=NewSuccedent; !list_Empty(Lits); Lits=list_Cdr(Lits))
term_ExchangeVariable(list_Car(Lits),Act,New);
Act = New;
NewConstraint = list_Nconc(Constraint,NewConstraint);
NewAntecedent = list_Nconc(Antecedent,NewAntecedent);
NewSuccedent = list_Nconc(Succedent,NewSuccedent);
}
NewClauses = list_Nconc(list_Copy(sort_ConditionClauses(Cond)),NewClauses);
}
return sort_ConditionNormalize(sort_ConditionCreate(Act,NewConstraint,NewAntecedent,NewSuccedent,NewClauses));
}
void sort_ConditionDelete(CONDITION C)
/**************************************************************
INPUT: A condition.
RETURNS: Nothing.
MEMORY: The condition and all literals and lists are deleted.
***************************************************************/
{
if (C!= (CONDITION)NULL) {
term_DeleteTermList(sort_ConditionConstraint(C));
term_DeleteTermList(sort_ConditionAntecedent(C));
term_DeleteTermList(sort_ConditionSuccedent(C));
list_Delete(sort_ConditionClauses(C));
sort_ConditionFree(C);
}
}
CONDITION sort_ConditionCopy(CONDITION C)
/**************************************************************
INPUT: A condition.
RETURNS: A copy of the condition.
***************************************************************/
{
return sort_ConditionCreate(sort_ConditionVar(C),
term_CopyTermList(sort_ConditionConstraint(C)),
term_CopyTermList(sort_ConditionAntecedent(C)),
term_CopyTermList(sort_ConditionSuccedent(C)),
list_Copy(sort_ConditionClauses(C)));
}
BOOL sort_IsBaseSortSymbol(SYMBOL Symbol)
/*********************************************************
INPUT: A Symbol.
RETURNS: The boolean value TRUE, if 'Symbol' is a
basesortsymbol, FALSE else.
*******************************************************/
{
#ifdef CHECK
if (!symbol_IsSymbol(Symbol)) {
misc_StartErrorReport();
misc_ErrorReport("\n In sort_IsBaseSymbol :");
misc_ErrorReport(" Illegal input. Input not a symbol.\n");
misc_FinishErrorReport();
}
#endif
return(symbol_IsPredicate(Symbol) && symbol_Arity(Symbol) == 1);
}
SORT sort_TheorySortOfSymbol(SORTTHEORY Theory, SYMBOL Symbol)
/*********************************************************
INPUT: A sort theory and a base sort symbol.
RETURNS: The Basesort of 'Symbol'.
*******************************************************/
{
#ifdef CHECK
if (!sort_IsBaseSortSymbol(Symbol)) {
misc_StartErrorReport();
misc_ErrorReport("\n In sort_TheorySortOfSymbol :");
misc_ErrorReport(" Illegal input. Input not a symbol.\n");
misc_FinishErrorReport();
}
#endif
return (list_List(sort_TheoryNode(Theory, Symbol)));
}
static void sort_EvalSubsortNoResidues(SORTTHEORY Theory, LIST Nodes)
/*********************************************************
INPUT: A sort theory and a list of nodes from this theory.
RETURNS: None.
EFFECT: Starting from the nodes in <Nodes> the subsort
graph is exploited as long as links fire and
new nodes become true. Only links without residues
are considered.
*******************************************************/
{
NODE Node,Head;
LIST Scan,Help,Clauses;
SLINK Link;
while (!list_Empty(Nodes)) {
Node = (NODE)list_Car(Nodes);
Scan = Nodes;
Nodes = list_Cdr(Nodes);
list_Free(Scan);
for (Scan = sort_NodeLinks(Node);
!list_Empty(Scan);
Scan = list_Cdr(Scan)) {
Link = (SLINK)list_Car(Scan);
if (sort_LinkNoResidues(Link) && sort_LinkDecrementFire(Link) == 0) {
Head = sort_LinkOutput(Link);
if (!sort_NodeValue(Theory, Head)) {
Clauses = list_List(sort_LinkClause(Link));
for (Help=sort_LinkInput(Link);!list_Empty(Help);Help=list_Cdr(Help))
if (!list_Empty(sort_NodeConditions(list_Car(Help))))
Clauses =
list_Nconc(list_Copy(sort_ConditionClauses(
list_Car(sort_NodeConditions(list_Car(Help))))),Clauses);
sort_DeleteConditionList(sort_NodeConditions(Head));
sort_PutNodeConditions(Head,list_List(sort_ConditionCreateNoResidues(Clauses)));