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tune and fix doc

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2014-09-24 09:20:21 -07:00
parent 16f80fce92
commit 918d52f1b0
13 changed files with 188 additions and 103 deletions
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32
src/muz/base/hnf.cpp
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@ -88,6 +88,7 @@ class hnf::imp {
proof_ref_vector m_defs;
contains_predicate_proc m_proc;
expr_free_vars m_free_vars;
ast_fast_mark1 m_mark1;
public:
@ -106,10 +107,37 @@ public:
m_proc(*this) {
}
bool is_horn(expr* n) {
expr* n1, *n2;
while (is_forall(n)) n = to_quantifier(n)->get_expr();
if (m.is_implies(n, n1, n2) && is_predicate(n2)) {
app* a1 = to_app(n1);
if (m.is_and(a1)) {
for (unsigned i = 0; i < a1->get_num_args(); ++i) {
if (!is_predicate(a1->get_arg(i)) &&
contains_predicate(a1->get_arg(i))) {
return false;
}
}
}
else if (!is_predicate(a1) && contains_predicate(a1)) {
return false;
}
return true;
}
return false;
}
void operator()(expr * n,
proof* p,
expr_ref_vector& result,
proof_ref_vector& ps) {
if (is_horn(n)) {
result.push_back(n);
ps.push_back(p);
return;
}
expr_ref fml(m);
proof_ref pr(m);
m_todo.reset();
@ -184,9 +212,11 @@ private:
bool contains_predicate(expr* fml) {
try {
quick_for_each_expr(m_proc, fml);
quick_for_each_expr(m_proc, m_mark1, fml);
m_mark1.reset();
}
catch (contains_predicate_proc::found) {
m_mark1.reset();
return true;
}
return false;