ATrans *boolean(tl_Node *p) /* computes the transitions to boolean nodes -> next & init */
{
ATrans *t1, *t2, *lft, *rgt, *result = (ATrans *)0;
int id;
switch (p->ntyp)
{
case TRUE:
result = emalloc_atrans();
clear_set(result->to, 0);
clear_set(result->pos, 1);
clear_set(result->neg, 1);
case FALSE:
break;
case AND:
lft = boolean(p->lft);
rgt = boolean(p->rgt);
for (t1 = lft; t1; t1 = t1->nxt)
{
for (t2 = rgt; t2; t2 = t2->nxt)
{
ATrans *tmp = merge_trans(t1, t2);
if (tmp)
{
tmp->nxt = result;
result = tmp;
}
}
}
free_atrans(lft, 1);
free_atrans(rgt, 1);
break;
case OR:
lft = boolean(p->lft);
for (t1 = lft; t1; t1 = t1->nxt)
{
ATrans *tmp = dup_trans(t1);
tmp->nxt = result;
result = tmp;
}
free_atrans(lft, 1);
rgt = boolean(p->rgt);
for (t1 = rgt; t1; t1 = t1->nxt)
{
ATrans *tmp = dup_trans(t1);
tmp->nxt = result;
result = tmp;
}
free_atrans(rgt, 1);
break;
default:
build_alternating(p);
result = emalloc_atrans();
clear_set(result->to, 0);
clear_set(result->pos, 1);
clear_set(result->neg, 1);
add_set(result->to, already_done(p));
}
return result;
}
ATrans *build_alternating(Node *p) /* builds an alternating automaton for p */
{
ATrans *t1, *t2, *t = (ATrans *)0;
int node = already_done(p);
if(node >= 0) return transition[node];
switch (p->ntyp) {
case TRUE:
t = emalloc_atrans();
clear_set(t->to, 0);
clear_set(t->pos, 1);
clear_set(t->neg, 1);
case FALSE:
break;
case PREDICATE:
t = emalloc_atrans();
clear_set(t->to, 0);
clear_set(t->pos, 1);
clear_set(t->neg, 1);
add_set(t->pos, get_sym_id(p->sym->name));
break;
case NOT:
t = emalloc_atrans();
clear_set(t->to, 0);
clear_set(t->pos, 1);
clear_set(t->neg, 1);
add_set(t->neg, get_sym_id(p->lft->sym->name));
break;
#ifdef NXT
case NEXT:
t = boolean(p->lft);
break;
#endif
case U_OPER: /* p U q <-> q || (p && X (p U q)) */
for(t2 = build_alternating(p->rgt); t2; t2 = t2->nxt) {
ATrans *tmp = dup_trans(t2); /* q */
tmp->nxt = t;
t = tmp;
}
for(t1 = build_alternating(p->lft); t1; t1 = t1->nxt) {
ATrans *tmp = dup_trans(t1); /* p */
add_set(tmp->to, node_id); /* X (p U q) */
tmp->nxt = t;
t = tmp;
}
add_set(final_set, node_id);
break;
case V_OPER: /* p V q <-> (p && q) || (p && X (p V q)) */
for(t1 = build_alternating(p->rgt); t1; t1 = t1->nxt) {
ATrans *tmp;
for(t2 = build_alternating(p->lft); t2; t2 = t2->nxt) {
tmp = merge_trans(t1, t2); /* p && q */
if(tmp) {
tmp->nxt = t;
t = tmp;
}
}
tmp = dup_trans(t1); /* p */
add_set(tmp->to, node_id); /* X (p V q) */
tmp->nxt = t;
t = tmp;
}
break;
case AND:
t = (ATrans *)0;
for(t1 = build_alternating(p->lft); t1; t1 = t1->nxt) {
for(t2 = build_alternating(p->rgt); t2; t2 = t2->nxt) {
ATrans *tmp = merge_trans(t1, t2);
if(tmp) {
tmp->nxt = t;
t = tmp;
}
}
}
break;
case OR:
t = (ATrans *)0;
for(t1 = build_alternating(p->lft); t1; t1 = t1->nxt) {
ATrans *tmp = dup_trans(t1);
tmp->nxt = t;
t = tmp;
}
for(t1 = build_alternating(p->rgt); t1; t1 = t1->nxt) {
ATrans *tmp = dup_trans(t1);
tmp->nxt = t;
t = tmp;
}
break;
default:
break;
}
transition[node_id] = t;
label[node_id++] = p;
return(t);
}