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/* See LICENSE file for copyright and license details. */
#include "common.h"
#ifndef TEST
LIBNORMALFORM_SENTENCE *
(libnormalform_imply)(LIBNORMALFORM_SENTENCE **xs)
{
LIBNORMALFORM_SENTENCE *t;
size_t n = 0, i;
while (xs[n])
n += 1;
if (!n) {
/* 1 → x = x and 0 → x = 1 */
return libnormalform_true();
}
/* a → b → c = a → (b → c) = (b → c) ← a = (c ← b) ← a = c ← b ← a */
for (i = 0; i < n--; i++) {
t = xs[i];
xs[i] = xs[n];
xs[n] = t;
}
return libnormalform_if(xs);
}
#else
#define IMPLY(...) LIBNORMALFORM_IMPLY(__VA_ARGS__)
int
main(void)
{
struct libnormalform_variable var1, var2, var3;
LIBNORMALFORM_SENTENCE *a, *b, *v1, *v2, *v3;
LIBNORMALFORM_SENTENCE *ts, *fs;
ASSUME(v1 = libnormalform_variable(&var1));
ASSUME(v2 = libnormalform_variable(&var2));
ASSUME(v3 = libnormalform_variable(&var3));
ASSUME(ts = libnormalform_true());
ASSUME(fs = libnormalform_false());
#ifdef USE_CHECKED_VERSION
errno = 0;
ASSERT(!IMPLY(REF(v1), NULL) && errno == 0);
errno = 1;
ASSERT(!IMPLY(REF(v1), NULL) && errno == 1);
errno = 0;
ASSERT(!IMPLY(NULL, REF(v1)) && errno == 0);
errno = 1;
ASSERT(!IMPLY(NULL, REF(v1)) && errno == 1);
errno = 0;
ASSERT(!IMPLY(NULL, NULL) && errno == 0);
errno = 1;
ASSERT(!IMPLY(NULL, NULL) && errno == 1);
#endif
#define T REF(ts)
#define F REF(fs)
#define TV LIBNORMALFORM_TRUE
#define FV LIBNORMALFORM_FALSE
#define ASSERT_CONST(VALUE, ...)\
do {\
ASSUME(a = IMPLY(__VA_ARGS__));\
ASSERT(a->type == TYPE_##VALUE);\
libnormalform_free(a);\
} while (0)
#define ASSERT_EVAL2(VALUE, V1, V2)\
do {\
ASSUME(a = IMPLY(REF(v1), REF(v2)));\
ASSERT(a->type != TYPE_TRUE && a->type != TYPE_FALSE);\
var1.value = V1##V;\
var2.value = V2##V;\
ASSERT(libnormalform_evaluate(a) == (int)LIBNORMALFORM_##VALUE);\
libnormalform_free(a);\
} while (0)
#ifndef USE_TWO
#if defined(__GNUC__)
# pragma GCC diagnostic push
# pragma GCC diagnostic ignored "-Wformat"
#endif
ASSERT_CONST(TRUE); /* IMPLY () -> TRUE */
#if defined(__GNUC__)
# pragma GCC diagnostic pop
#endif
ASSERT_CONST(TRUE, T); /* IMPLY (TRUE) -> TRUE */
ASSERT_CONST(FALSE, F); /* IMPLY (FALSE) -> FALSE */
#endif
ASSERT_CONST(TRUE, F, F); /* IMPLY (FALSE, FALSE) -> TRUE */
ASSERT_CONST(TRUE, F, T); /* IMPLY (FALSE, TRUE) -> TRUE */
ASSERT_CONST(FALSE, T, F); /* IMPLY (TRUE, FALSE) -> FALSE */
ASSERT_CONST(TRUE, T, T); /* IMPLY (TRUE, TRUE) -> TRUE */
ASSERT_EVAL2(TRUE, F, F); /* IMPLY (var(FALSE), var(FALSE)) => TRUE */
ASSERT_EVAL2(TRUE, F, T); /* IMPLY (var(FALSE), var(TRUE)) => TRUE */
ASSERT_EVAL2(FALSE, T, F); /* IMPLY (var(TRUE), var(FALSE)) => FALSE */
ASSERT_EVAL2(TRUE, T, T); /* IMPLY (var(TRUE), var(TRUE)) => TRUE */
#ifndef USE_TWO
/* IMPLY (x) -> x */
ASSUME(a = IMPLY(REF(v1)));
ASSERT(a == v1);
ASSERT(a->refcount == 2);
libnormalform_free(a);
#endif
/* IMPLY (x, y) -> IF (y, x) */
ASSUME(a = IMPLY(REF(v1), REF(v2)));
ASSUME(b = libnormalform_if2(REF(v2), REF(v1)));
ASSERT_EQUAL(a, b);
libnormalform_free(a);
libnormalform_free(b);
#ifndef USE_TWO
/* IMPLY (x, y, z) -> IF (z, y, x) */
ASSUME(a = IMPLY(REF(v1), REF(v2), REF(v3)));
ASSUME(b = libnormalform_ifl(REF(v3), REF(v2), REF(v1), NULL));
ASSERT_EQUAL(a, b);
libnormalform_free(a);
libnormalform_free(b);
/* IMPLY (x, y) -> independence from IMPLY (y, x) */
ASSUME(a = IMPLY(REF(v1), REF(v2)));
ASSUME(b = IMPLY(REF(v2), REF(v1)));
ASSERT_NOTEQUAL(a, b);
libnormalform_free(a);
libnormalform_free(b);
#endif
#undef T
#undef F
#undef TV
#undef FV
#undef ASSERT_CONST
#undef ASSERT_EVAL2
libnormalform_free(v1);
libnormalform_free(v2);
libnormalform_free(v3);
libnormalform_free(ts);
libnormalform_free(fs);
return 0;
}
#endif
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