743 lines
17 KiB
C
743 lines
17 KiB
C
/*************************************************************************
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* *
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* YAP Prolog *
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* *
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* Yap Prolog was developed at NCCUP - Universidade do Porto *
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* *
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* Copyright L.Damas, V.S.Costa and Universidade do Porto 1985-1997 *
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* *
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**************************************************************************
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* *
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* File: cmppreds.c *
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* Last rev: *
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* mods: *
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* comments: comparing two prolog terms *
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* *
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*************************************************************************/
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#ifdef SCCS
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static char SccsId[] = "%W% %G%";
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#endif
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#include "Yap.h"
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#include "Yatom.h"
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#include "YapHeap.h"
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#include "eval.h"
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#if HAVE_STRING_H
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#include <string.h>
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#endif
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#include <wchar.h>
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STATIC_PROTO(Int compare, (Term, Term));
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STATIC_PROTO(Int p_compare, ( USES_REGS1 ));
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STATIC_PROTO(Int p_acomp, ( USES_REGS1 ));
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STATIC_PROTO(Int a_eq, (Term,Term));
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STATIC_PROTO(Int a_dif, (Term,Term));
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STATIC_PROTO(Int a_gt, (Term, Term));
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STATIC_PROTO(Int a_ge, (Term,Term));
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STATIC_PROTO(Int a_lt, (Term,Term));
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STATIC_PROTO(Int a_le, (Term,Term));
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STATIC_PROTO(Int a_noteq, (Term,Term));
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STATIC_PROTO(Int a_gen_lt, (Term,Term));
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STATIC_PROTO(Int a_gen_le, (Term,Term));
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STATIC_PROTO(Int a_gen_gt, (Term,Term));
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STATIC_PROTO(Int a_gen_ge, (Term,Term));
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#define rfloat(X) ( X > 0.0 ? 1 : ( X == 0.0 ? 0 : -1))
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static int
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cmp_atoms(Atom a1, Atom a2)
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{
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if (IsWideAtom(a1)) {
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if (IsWideAtom(a2)) {
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return wcscmp((wchar_t *)RepAtom(a1)->StrOfAE,(wchar_t *)RepAtom(a2)->StrOfAE);
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} else {
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/* The standard does not seem to have nothing on this */
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unsigned char *s1 = (unsigned char *)RepAtom(a1)->StrOfAE;
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wchar_t *s2 = (wchar_t *)RepAtom(a2)->StrOfAE;
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while (*s1 == *s2) {
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if (!*s1) return 0;
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s1++;
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s2++;
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}
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return *s1-*s2;
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}
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} else if (IsWideAtom(a2)) {
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/* The standard does not seem to have nothing on this */
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wchar_t *s1 = (wchar_t *)RepAtom(a1)->StrOfAE;
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unsigned char *s2 = (unsigned char *)RepAtom(a2)->StrOfAE;
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while (*s1 == *s2) {
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if (!*s1) return 0;
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s1++;
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s2++;
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}
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return *s1-*s2;
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} else {
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return strcmp(RepAtom(a1)->StrOfAE,RepAtom(a2)->StrOfAE);
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}
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}
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static int compare_complex(register CELL *pt0, register CELL *pt0_end, register
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CELL *pt1)
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{
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CACHE_REGS
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register CELL **to_visit = (CELL **)H;
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register int out = 0;
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loop:
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while (pt0 < pt0_end) {
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register CELL d0, d1;
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++ pt0;
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++ pt1;
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d0 = Derefa(pt0);
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d1 = Derefa(pt1);
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if (IsVarTerm(d0)) {
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if (IsVarTerm(d1)) {
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out = Signed(d0) - Signed(d1);
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if (out) goto done;
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}
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else {
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out = -1;
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goto done;
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}
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} else if (IsVarTerm(d1)) {
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out = 1;
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goto done;
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} else {
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if (d0 == d1) continue;
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else if (IsAtomTerm(d0)) {
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if (IsAtomTerm(d1))
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out = cmp_atoms(AtomOfTerm(d0), AtomOfTerm(d1));
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else if (IsPrimitiveTerm(d1))
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out = 1;
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else out = -1;
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/* I know out must be != 0 */
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goto done;
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}
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else if (IsIntTerm(d0)) {
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if (IsIntTerm(d1))
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out = IntOfTerm(d0) - IntOfTerm(d1);
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else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = IntOfTerm(d0) - LongIntOfTerm(d1);
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#ifdef USE_GMP
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(IntOfTerm(d0), d1);
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#endif
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} else if (IsRefTerm(d1))
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out = 1 ;
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else out = -1;
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if (out != 0)
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goto done;
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} else if (IsFloatTerm(d0)) {
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if (IsFloatTerm(d1)){
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out = rfloat(FloatOfTerm(d0) - FloatOfTerm(d1));
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} else if (IsRefTerm(d1)) {
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out = 1;
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} else {
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out = -1;
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}
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if (out != 0)
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goto done;
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} else if (IsLongIntTerm(d0)) {
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if (IsIntTerm(d1))
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out = LongIntOfTerm(d0) - IntOfTerm(d1);
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else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = LongIntOfTerm(d0) - LongIntOfTerm(d1);
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#ifdef USE_GMP
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(LongIntOfTerm(d0), d1);
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#endif
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} else if (IsRefTerm(d1)) {
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out = 1 ;
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} else {
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out = -1;
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}
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if (out != 0)
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goto done;
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}
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#ifdef USE_GMP
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else if (IsBigIntTerm(d0)) {
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if (IsIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(d0, IntOfTerm(d1));
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} else if (IsFloatTerm(d1)) {
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out = 1;
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} else if (IsLongIntTerm(d1)) {
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out = Yap_gmp_tcmp_int_big(d0, LongIntOfTerm(d1));
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} else if (IsBigIntTerm(d1)) {
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out = Yap_gmp_tcmp_big_big(d0, d1);
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} else if (IsRefTerm(d1))
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out = 1 ;
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else out = -1;
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if (out != 0)
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goto done;
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}
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#endif
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else if (IsPairTerm(d0)) {
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if (!IsPairTerm(d1)) {
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if (IsApplTerm(d1)) {
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Functor f = FunctorOfTerm(d1);
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if (IsExtensionFunctor(f))
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out = 1;
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else if (!(out = 2-ArityOfFunctor(f)))
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out = strcmp(".",RepAtom(NameOfFunctor(f))->StrOfAE);
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} else out = 1;
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goto done;
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}
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#ifdef RATIONAL_TREES
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit[3] = (CELL *)*pt0;
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to_visit += 4;
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*pt0 = d1;
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#else
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/* store the terms to visit */
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if (pt0 < pt0_end) {
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit += 3;
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}
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#endif
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pt0 = RepPair(d0) - 1;
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pt0_end = RepPair(d0) + 1;
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pt1 = RepPair(d1) - 1;
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continue;
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}
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else if (IsRefTerm(d0)) {
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if (IsRefTerm(d1))
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out = Unsigned(RefOfTerm(d1)) -
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Unsigned(RefOfTerm(d0));
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else out = -1;
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goto done;
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} else if (IsApplTerm(d0)) {
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register Functor f;
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register CELL *ap2, *ap3;
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if (!IsApplTerm(d1)) {
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out = 1 ;
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goto done;
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} else {
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/* store the terms to visit */
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Functor f2;
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ap2 = RepAppl(d0);
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ap3 = RepAppl(d1);
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f = (Functor)(*ap2);
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if (IsExtensionFunctor(f)) {
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out = 1;
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goto done;
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}
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f2 = (Functor)(*ap3);
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if (IsExtensionFunctor(f2)) {
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out = -1;
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goto done;
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}
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/* compare functors */
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if (f != (Functor)*ap3) {
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if (!(out = ArityOfFunctor(f)-ArityOfFunctor(f2)))
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out = cmp_atoms(NameOfFunctor(f), NameOfFunctor(f2));
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goto done;
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}
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#ifdef RATIONAL_TREES
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit[3] = (CELL *)*pt0;
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to_visit += 4;
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*pt0 = d1;
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#else
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/* store the terms to visit */
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if (pt0 < pt0_end) {
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to_visit[0] = pt0;
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to_visit[1] = pt0_end;
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to_visit[2] = pt1;
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to_visit += 3;
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}
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#endif
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d0 = ArityOfFunctor(f);
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pt0 = ap2;
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pt0_end = ap2 + d0;
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pt1 = ap3;
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continue;
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}
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}
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}
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}
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/* Do we still have compound terms to visit */
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if (to_visit > (CELL **)H) {
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#ifdef RATIONAL_TREES
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to_visit -= 4;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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*pt0 = (CELL)to_visit[3];
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#else
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to_visit -= 3;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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#endif
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goto loop;
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}
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done:
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/* failure */
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#ifdef RATIONAL_TREES
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while (to_visit > (CELL **)H) {
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to_visit -= 4;
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pt0 = to_visit[0];
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pt0_end = to_visit[1];
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pt1 = to_visit[2];
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*pt0 = (CELL)to_visit[3];
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}
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#endif
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return(out);
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}
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inline static Int
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compare(Term t1, Term t2) /* compare terms t1 and t2 */
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{
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if (t1 == t2)
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return 0;
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if (IsVarTerm(t1)) {
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if (IsVarTerm(t2))
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return Signed(t1) - Signed(t2);
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return -1;
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} else if (IsVarTerm(t2)) {
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/* get rid of variables */
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return 1;
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}
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if (IsAtomOrIntTerm(t1)) {
|
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if (IsAtomTerm(t1)) {
|
|
if (IsAtomTerm(t2))
|
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return cmp_atoms(AtomOfTerm(t1),AtomOfTerm(t2));
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if (IsPrimitiveTerm(t2))
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return 1;
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return -1;
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} else {
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if (IsIntTerm(t2)) {
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return IntOfTerm(t1) - IntOfTerm(t2);
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}
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if (IsFloatTerm(t2)) {
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return 1;
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}
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if (IsLongIntTerm(t2)) {
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return IntOfTerm(t1) - LongIntOfTerm(t2);
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}
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#ifdef USE_GMP
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if (IsBigIntTerm(t2)) {
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return Yap_gmp_tcmp_int_big(IntOfTerm(t1), t2);
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}
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#endif
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if (IsRefTerm(t2))
|
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return 1;
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return -1;
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}
|
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} else if (IsPairTerm(t1)) {
|
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if (IsApplTerm(t2)) {
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Functor f = FunctorOfTerm(t2);
|
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if (IsExtensionFunctor(f))
|
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return 1;
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|
else {
|
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int out;
|
|
if (!(out = 2-ArityOfFunctor(f)))
|
|
out = strcmp(".",RepAtom(NameOfFunctor(f))->StrOfAE);
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|
return(out);
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|
}
|
|
}
|
|
if (IsPairTerm(t2)) {
|
|
return(compare_complex(RepPair(t1)-1,
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RepPair(t1)+1,
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RepPair(t2)-1));
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}
|
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else return 1;
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} else {
|
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/* compound term */
|
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Functor fun1 = FunctorOfTerm(t1);
|
|
|
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if (IsExtensionFunctor(fun1)) {
|
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/* float, long, big, dbref */
|
|
switch ((CELL)fun1) {
|
|
case double_e:
|
|
{
|
|
if (IsFloatTerm(t2))
|
|
return(rfloat(FloatOfTerm(t1) - FloatOfTerm(t2)));
|
|
if (IsRefTerm(t2))
|
|
return 1;
|
|
return -1;
|
|
}
|
|
case long_int_e:
|
|
{
|
|
if (IsIntTerm(t2))
|
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return LongIntOfTerm(t1) - IntOfTerm(t2);
|
|
if (IsFloatTerm(t2)) {
|
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return 1;
|
|
}
|
|
if (IsLongIntTerm(t2))
|
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return LongIntOfTerm(t1) - LongIntOfTerm(t2);
|
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#ifdef USE_GMP
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|
if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_tcmp_int_big(LongIntOfTerm(t1), t2);
|
|
}
|
|
#endif
|
|
if (IsRefTerm(t2))
|
|
return 1;
|
|
return -1;
|
|
}
|
|
#ifdef USE_GMP
|
|
case big_int_e:
|
|
{
|
|
if (IsIntTerm(t2))
|
|
return Yap_gmp_tcmp_big_int(t1, IntOfTerm(t2));
|
|
if (IsFloatTerm(t2)) {
|
|
return 1;
|
|
}
|
|
if (IsLongIntTerm(t2))
|
|
return Yap_gmp_tcmp_big_int(t1, LongIntOfTerm(t2));
|
|
if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_tcmp_big_big(t1, t2);
|
|
}
|
|
if (IsRefTerm(t2))
|
|
return 1;
|
|
return -1;
|
|
}
|
|
#endif
|
|
case db_ref_e:
|
|
if (IsRefTerm(t2))
|
|
return Unsigned(RefOfTerm(t2)) -
|
|
Unsigned(RefOfTerm(t1));
|
|
return -1;
|
|
}
|
|
}
|
|
if (!IsApplTerm(t2)) {
|
|
if (IsPairTerm(t2)) {
|
|
Int out;
|
|
Functor f = FunctorOfTerm(t1);
|
|
|
|
if (!(out = ArityOfFunctor(f))-2)
|
|
out = strcmp(RepAtom(NameOfFunctor(f))->StrOfAE,".");
|
|
return out;
|
|
}
|
|
return 1;
|
|
} else {
|
|
Functor fun2 = FunctorOfTerm(t2);
|
|
Int r;
|
|
|
|
if (IsExtensionFunctor(fun2)) {
|
|
return 1;
|
|
}
|
|
r = ArityOfFunctor(fun1) - ArityOfFunctor(fun2);
|
|
if (r)
|
|
return r;
|
|
r = cmp_atoms(NameOfFunctor(fun1), NameOfFunctor(fun2));
|
|
if (r)
|
|
return r;
|
|
else
|
|
return(compare_complex(RepAppl(t1),
|
|
RepAppl(t1)+ArityOfFunctor(fun1),
|
|
RepAppl(t2)));
|
|
}
|
|
}
|
|
}
|
|
|
|
Int Yap_compare_terms(Term d0, Term d1)
|
|
{
|
|
return compare(Deref(d0),Deref(d1));
|
|
}
|
|
|
|
static Int
|
|
p_compare( USES_REGS1 )
|
|
{ /* compare(?Op,?T1,?T2) */
|
|
Int r = compare(Deref(ARG2), Deref(ARG3));
|
|
Atom p;
|
|
|
|
if (r < 0)
|
|
p = AtomLT;
|
|
else if (r > 0)
|
|
p = AtomGT;
|
|
else
|
|
p = AtomEQ;
|
|
return Yap_unify_constant(ARG1, MkAtomTerm(p));
|
|
}
|
|
|
|
inline static Int
|
|
int_cmp(Int dif)
|
|
{
|
|
return dif;
|
|
}
|
|
|
|
inline static Int
|
|
flt_cmp(Float dif)
|
|
{
|
|
if (dif < 0.0)
|
|
return -1;
|
|
if (dif > 0.0)
|
|
return 1;
|
|
return dif = 0.0;
|
|
}
|
|
|
|
|
|
static inline Int
|
|
a_cmp(Term t1, Term t2 USES_REGS)
|
|
{
|
|
LOCAL_ArithError = FALSE;
|
|
if (IsVarTerm(t1)) {
|
|
LOCAL_ArithError = TRUE;
|
|
Yap_Error(INSTANTIATION_ERROR, t1, "=:=/2");
|
|
return FALSE;
|
|
}
|
|
if (IsVarTerm(t2)) {
|
|
LOCAL_ArithError = TRUE;
|
|
Yap_Error(INSTANTIATION_ERROR, t2, "=:=/2");
|
|
return FALSE;
|
|
}
|
|
if (IsFloatTerm(t1) && IsFloatTerm(t2)) {
|
|
return flt_cmp(FloatOfTerm(t1)-FloatOfTerm(t2));
|
|
}
|
|
if (IsIntegerTerm(t1) && IsIntegerTerm(t2)) {
|
|
return int_cmp(IntegerOfTerm(t1)-IntegerOfTerm(t2));
|
|
}
|
|
t1 = Yap_Eval(t1);
|
|
if (!t1) {
|
|
return FALSE;
|
|
}
|
|
if (IsIntegerTerm(t1)) {
|
|
Int i1 = IntegerOfTerm(t1);
|
|
t2 = Yap_Eval(t2);
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
Int i2 = IntegerOfTerm(t2);
|
|
return int_cmp(i1-i2);
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
LOCAL_Error_TYPE = EVALUATION_ERROR_UNDEFINED;
|
|
LOCAL_Error_Term = t2;
|
|
LOCAL_ErrorMessage = "trying to evaluate nan";
|
|
LOCAL_ArithError = TRUE;
|
|
}
|
|
#endif
|
|
return flt_cmp(i1-f2);
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_int_big(i1,t2);
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
} else if (IsFloatTerm(t1)) {
|
|
Float f1 = FloatOfTerm(t1);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f1)) {
|
|
LOCAL_Error_TYPE = EVALUATION_ERROR_UNDEFINED;
|
|
LOCAL_Error_Term = t1;
|
|
LOCAL_ErrorMessage = "trying to evaluate nan";
|
|
LOCAL_ArithError = TRUE;
|
|
}
|
|
#endif
|
|
t2 = Yap_Eval(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f1))
|
|
return -1;
|
|
#endif
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
Int i2 = IntegerOfTerm(t2);
|
|
return flt_cmp(f1-i2);
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
LOCAL_Error_TYPE = EVALUATION_ERROR_UNDEFINED;
|
|
LOCAL_Error_Term = t2;
|
|
LOCAL_ErrorMessage = "trying to evaluate nan";
|
|
LOCAL_ArithError = TRUE;
|
|
}
|
|
#endif
|
|
return flt_cmp(f1-f2);
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_float_big(f1,t2);
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
#ifdef USE_GMP
|
|
} else if (IsBigIntTerm(t1)) {
|
|
{
|
|
t2 = Yap_Eval(t2);
|
|
|
|
if (IsIntegerTerm(t2)) {
|
|
return Yap_gmp_cmp_big_int(t1, IntegerOfTerm(t2));
|
|
} else if (IsFloatTerm(t2)) {
|
|
Float f2 = FloatOfTerm(t2);
|
|
#if HAVE_ISNAN
|
|
if (isnan(f2)) {
|
|
LOCAL_Error_TYPE = EVALUATION_ERROR_UNDEFINED;
|
|
LOCAL_Error_Term = t2;
|
|
LOCAL_ErrorMessage = "trying to evaluate nan";
|
|
LOCAL_ArithError = TRUE;
|
|
}
|
|
#endif
|
|
return Yap_gmp_cmp_big_float(t1, f2);
|
|
} else if (IsBigIntTerm(t2)) {
|
|
return Yap_gmp_cmp_big_big(t1, t2);
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
#endif
|
|
} else {
|
|
return FALSE;
|
|
}
|
|
}
|
|
|
|
|
|
static Int
|
|
p_acomp( USES_REGS1 )
|
|
{ /* $a_compare(?R,+X,+Y) */
|
|
Term t1 = Deref(ARG1);
|
|
Term t2 = Deref(ARG2);
|
|
Int out;
|
|
|
|
out = a_cmp(t1, t2 PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out;
|
|
}
|
|
|
|
static Int
|
|
a_eq(Term t1, Term t2)
|
|
{
|
|
CACHE_REGS
|
|
/* A =:= B */
|
|
int out;
|
|
|
|
if (IsVarTerm(t1)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t1, "=:=/2");
|
|
return(FALSE);
|
|
}
|
|
if (IsVarTerm(t2)) {
|
|
Yap_Error(INSTANTIATION_ERROR, t2, "=:=/2");
|
|
return(FALSE);
|
|
}
|
|
if (IsFloatTerm(t1)) {
|
|
if (IsFloatTerm(t2))
|
|
return (FloatOfTerm(t1) == FloatOfTerm(t2));
|
|
else if (IsIntegerTerm(t2)) {
|
|
return (FloatOfTerm(t1) == IntegerOfTerm(t2));
|
|
}
|
|
}
|
|
if (IsIntegerTerm(t1)) {
|
|
if (IsIntegerTerm(t2)) {
|
|
return (IntegerOfTerm(t1) == IntegerOfTerm(t2));
|
|
} else if (IsFloatTerm(t2)) {
|
|
return (FloatOfTerm(t2) == IntegerOfTerm(t1));
|
|
}
|
|
}
|
|
out = a_cmp(t1,t2 PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out == 0;
|
|
}
|
|
|
|
static Int
|
|
a_dif(Term t1, Term t2)
|
|
{
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1),Deref(t2) PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out != 0;
|
|
}
|
|
|
|
static Int
|
|
a_gt(Term t1, Term t2)
|
|
{ /* A > B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1),Deref(t2) PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out > 0;
|
|
}
|
|
|
|
static Int
|
|
a_ge(Term t1, Term t2)
|
|
{ /* A >= B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1),Deref(t2) PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out >= 0;
|
|
}
|
|
|
|
static Int
|
|
a_lt(Term t1, Term t2)
|
|
{ /* A < B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1),Deref(t2) PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out < 0;
|
|
}
|
|
|
|
static Int
|
|
a_le(Term t1, Term t2)
|
|
{ /* A <= B */
|
|
CACHE_REGS
|
|
Int out = a_cmp(Deref(t1),Deref(t2) PASS_REGS);
|
|
if (LOCAL_ArithError) { Yap_Error(LOCAL_Error_TYPE, LOCAL_Error_Term, LOCAL_ErrorMessage); return FALSE; }
|
|
return out <= 0;
|
|
}
|
|
|
|
|
|
static Int
|
|
a_noteq(Term t1, Term t2)
|
|
{
|
|
return (compare(t1, t2) != 0);
|
|
}
|
|
|
|
static Int
|
|
a_gen_lt(Term t1, Term t2)
|
|
{
|
|
return (compare(t1, t2) < 0);
|
|
}
|
|
|
|
static Int
|
|
a_gen_le(Term t1, Term t2)
|
|
{
|
|
return (compare(t1, t2) <= 0);
|
|
}
|
|
|
|
static Int
|
|
a_gen_gt(Term t1, Term t2)
|
|
{
|
|
return compare(t1, t2) > 0;
|
|
}
|
|
|
|
static Int
|
|
a_gen_ge(Term t1, Term t2)
|
|
{
|
|
return compare(t1, t2) >= 0;
|
|
}
|
|
|
|
|
|
void
|
|
Yap_InitCmpPreds(void)
|
|
{
|
|
Yap_InitCmpPred("=:=", 2, a_eq, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("=\\=", 2, a_dif, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred(">", 2, a_gt, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("=<", 2, a_le, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred("<", 2, a_lt, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCmpPred(">=", 2, a_ge, SafePredFlag | BinaryPredFlag);
|
|
Yap_InitCPred("$a_compare", 3, p_acomp, TestPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("\\==", 2, a_noteq, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@<", 2, a_gen_lt, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@=<", 2, a_gen_le, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@>", 2, a_gen_gt, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCmpPred("@>=", 2, a_gen_ge, BinaryPredFlag | SafePredFlag);
|
|
Yap_InitCPred("compare", 3, p_compare, TestPredFlag | SafePredFlag);
|
|
}
|