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/*
* Copyright (C) 2017 "IoT.bzh"
* Author José Bollo <jose.bollo@iot.bzh>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include "afb-perm.h"
char *exprs[] = {
"a",
"not a",
"a or b",
"a or b or c",
"a or b or c or d",
"a and b",
"a and b and c",
"a and b and c and d",
"a and b or c and d",
"a or b and c or d",
"(a or b) and (c or d)",
"not (a or b or c or d)",
"a and not (b or c or d)",
"b and not (a or c or d)",
"c and not (a or b or d)",
"d and not (a or b or c)",
NULL
};
int check(void *closure, const char *name)
{
int x;
x = *(int*)closure;
if (name[0] < 'a' || name[0] > 'd' || name[1])
return 0;
return 1 & (x >> (name[0] - 'a'));
}
int test(const char *expr)
{
int x, r, m, c;
struct afb_perm *perm;
r = 0;
m = 1;
perm = afb_perm_parse(expr);
if (!perm)
printf("error for %s\n", expr);
else {
printf("\nabcd %s\n", expr);
for (x = 0; x < 16 ; x++) {
c = afb_perm_check(perm, check, &x);
printf("%c%c%c%c %d\n",
'0'+!!(x&1), '0'+!!(x&2), '0'+!!(x&4), '0'+!!(x&8),
c);
if (c)
r |= m;
m <<= 1;
}
}
afb_perm_unref(perm);
return r;
}
void add(char *buffer, const char *fmt, ...)
{
char b[60];
va_list vl;
va_start(vl, fmt);
vsprintf(b, fmt, vl);
va_end(vl);
strcat(buffer, b);
}
void mke(int value, int bits, char *buffer)
{
int nval = 1 << bits;
int sval = 1 << (bits - 1);
int mask = (1 << nval) - 1;
int smask = (1 << sval) - 1;
int val = value & mask;
int val0 = val & smask;
int val1 = (val >> sval) & smask;
char c = (char)('a' + bits - 1);
if (bits == 1) {
switch(val) {
case 0: add(buffer, "x"); break;
case 1: add(buffer, "not %c", c); break;
case 2: add(buffer, "%c", c); break;
case 3: add(buffer, "(%c or not %c) ", c, c); break;
}
} else if (val0 != val1) {
if (val0 && val1)
add(buffer, "(");
if (val0) {
add(buffer, "not %c", c);
if (val0 != smask) {
add(buffer, " and ");
mke(val0, bits - 1, buffer);
}
}
if (val0 && val1)
add(buffer, " or ");
if (val1) {
add(buffer, "%c", c);
if (val1 != smask) {
add(buffer, " and ");
mke(val1, bits - 1, buffer);
}
}
if (val0 && val1)
add(buffer, ")");
} else {
mke(val0, bits - 1, buffer);
}
}
void makeexpr(int value, char *buffer)
{
if (!value)
strcpy(buffer, "x");
else {
buffer[0] = 0;
mke(value, 4, buffer);
}
}
int fulltest()
{
char buffer[4096];
int i, j, r;
r = 0;
for (i = 0 ; i < 65536 ; i++) {
makeexpr(i, buffer);
j = test(buffer);
printf("[[[ %d %s %d ]]] %d %s\n", i, i==j?"==":"!=", j, (int)strlen(buffer), buffer);
if (i != j)
r = 1;
}
return r;
}
int main()
{
int i = 0;
while(exprs[i])
test(exprs[i++]);
return fulltest();
}
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