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add regular expression membership for range of int.to.str functions. Issue #957

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-04-11 10:49:42 +08:00
parent be3cc91323
commit 4140afa4cb
2 changed files with 12 additions and 0 deletions
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11
src/smt/theory_seq.cpp
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@ -2345,6 +2345,17 @@ bool theory_seq::add_itos_axiom(expr* e) {
return false;
}
add_axiom(mk_eq(e2, n, false));
#if 1
expr_ref num_re(m), opt_re(m);
num_re = m_util.re.mk_range(m_util.str.mk_string(symbol("0")), m_util.str.mk_string(symbol("9")));
num_re = m_util.re.mk_plus(num_re);
opt_re = m_util.re.mk_opt(m_util.re.mk_to_re(m_util.str.mk_string(symbol("-"))));
num_re = m_util.re.mk_concat(opt_re, num_re);
app_ref in_re(m_util.re.mk_in_re(e, num_re), m);
internalize_term(in_re);
propagate_in_re(in_re, true);
#endif
m_trail_stack.push(push_replay(alloc(replay_axiom, m, e)));
return true;
}