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add general purpose emptiness/non-emptiness check

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-26 20:42:21 -07:00
parent 33cdc06eb4
commit 88e36c6bf3
8 changed files with 298 additions and 65 deletions
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10
src/smt/theory_seq.cpp
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@ -1536,7 +1536,7 @@ bool theory_seq::internalize_term(app* term) {
}
if (ctx.get_fparams().m_seq_use_derivatives &&
(m_util.str.is_in_re(term) || m_sk.is_accept(term))) {
(m_util.str.is_in_re(term) || m_sk.is_skolem(term))) {
bool_var bv = ctx.mk_bool_var(term);
ctx.set_var_theory(bv, get_id());
ctx.mark_as_relevant(bv);
@ -3069,6 +3069,14 @@ void theory_seq::assign_eh(bool_var v, bool is_true) {
}
}
}
else if (m_sk.is_is_empty(e)) {
if (is_true)
m_regex.propagate_is_empty(lit);
}
else if (m_sk.is_is_non_empty(e)) {
if (is_true)
m_regex.propagate_is_non_empty(lit);
}
else if (m_sk.is_step(e)) {
if (is_true) {
propagate_step(lit, e);