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yap-6.3/C/range.c
Vítor Santos Costa 37e4d242ad range predicates.
2012-11-02 22:36:33 +00:00

130 lines
3.6 KiB
C

/*************************************************************************
* *
* YAP Prolog *
* *
* Yap Prolog was developed at NCCUP - Universidade do Porto *
* *
* Copyright L.Damas, V. Santos Costa and Universidade do Porto 1985-- *
* *
**************************************************************************
* *
* File: range.c *
* comments: Arithmetic interval computation *
* *
* *
* *
*************************************************************************/
#ifdef SCCS
static char SccsId[] = "%W% %G%";
#endif
#include "Yap.h"
#include "Yatom.h"
#include "YapHeap.h"
#include "eval.h"
static Int
p_in_range( USES_REGS1 ) {
Term t;
double i,j;
double d1;
double d2;
double d3;
t = Deref(ARG1);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(ARG4);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d1 = i-j;
t = Deref(ARG2);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(ARG5);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d2 = i-j;
t = Deref(ARG3);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(ARG6);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d3 = i-j;
t = Deref(ARG7);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(ARG8);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
return fabs(sqrt(d1*d1 + d2*d2 + d3*d3)-i) <= j;
}
static Int
p_in_range2( USES_REGS1 ) {
CELL *p1, *p2;
Term t;
double i,j;
double d1;
double d2;
double d3;
UInt arity;
p1 = RepAppl(Deref(ARG1));
arity = ArityOfFunctor((Functor)*p1);
p1 += arity-2;
p2 = RepAppl(Deref(ARG2))+(arity-2);;
t = Deref(p1[0]);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(p2[0]);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d1 = i-j;
t = Deref(p1[1]);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(p2[1]);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d2 = i-j;
t = Deref(p1[2]);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(p2[2]);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
d3 = i-j;
t = Deref(ARG3);
if (IsFloatTerm(t)) i = FloatOfTerm(t); else i = IntegerOfTerm(t);
t = Deref(ARG4);
if (IsFloatTerm(t)) j = FloatOfTerm(t); else j = IntegerOfTerm(t);
return fabs(sqrt(d1*d1 + d2*d2 + d3*d3)-i) <= j;
}
static Int
p_euc_dist( USES_REGS1 ) {
Term t1 = Deref(ARG1);
Term t2 = Deref(ARG2);
double d1 = (double)(IntegerOfTerm(ArgOfTerm(1,t1))-IntegerOfTerm(ArgOfTerm(1,t2)));
double d2 = (double)(IntegerOfTerm(ArgOfTerm(2,t1))-IntegerOfTerm(ArgOfTerm(2,t2)));
double d3 = (double)(IntegerOfTerm(ArgOfTerm(3,t1))-IntegerOfTerm(ArgOfTerm(3,t2)));
Int result = (Int)sqrt(d1*d1+d2*d2+d3*d3);
return(Yap_unify(ARG3,MkIntegerTerm(result)));
}
#if DEBUG
volatile int loop_counter = 0;
static Int
p_loop( USES_REGS1 ) {
while (loop_counter == 0);
return(TRUE);
}
#endif
void
Yap_InitRange(void)
{
CACHE_REGS
Term cm = CurrentModule;
CurrentModule = RANGE_MODULE;
Yap_InitCPred("euclidean_distance", 3, p_euc_dist, SafePredFlag);
#ifdef DEBUG
Yap_InitCPred("loop", 0, p_loop, SafePredFlag);
#endif
Yap_InitCPred("in_range", 8, p_in_range, TestPredFlag|SafePredFlag);
Yap_InitCPred("in_range", 4, p_in_range2, TestPredFlag|SafePredFlag);
CurrentModule = cm;
}