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more fixes related to issue #5140 (#5466)

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* instead of u in to_re(s) make u = s

* bug fix: added missing emptiness check
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Margus Veanes 2021-08-09 17:48:35 -07:00 committed by GitHub
parent 3eb849ad9e
commit 22bb4c2db7
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1 changed files with 3 additions and 2 deletions
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5
src/ast/rewriter/seq_rewriter.cpp
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@ -3476,7 +3476,8 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
// if ((isdigit ele) and (ele = (hd r1))) then (to_re (tl r1)) else []
//
hd = mk_seq_first(r1);
m_br.mk_and(u().mk_le(m_util.mk_char('0'), ele), u().mk_le(ele, m_util.mk_char('9')), m().mk_eq(hd, ele), result);
m_br.mk_and(u().mk_le(m_util.mk_char('0'), ele), u().mk_le(ele, m_util.mk_char('9')),
m().mk_and(m().mk_not(m().mk_eq(r1, str().mk_empty(seq_sort))), m().mk_eq(hd, ele)), result);
tl = re().mk_to_re(mk_seq_rest(r1));
return re_and(result, tl);
}
@ -3802,7 +3803,7 @@ br_status seq_rewriter::mk_str_in_regexp(expr* a, expr* b, expr_ref& result) {
expr* s = nullptr;
result = m().mk_and(m_autil.mk_ge(len_a, len_tl),
re().mk_in_re(str().mk_substr(a, m_autil.mk_int(0), len_hd), hd),
(false && re().is_to_re(tl, s) ? m().mk_eq(s, str().mk_substr(a, len_hd, len_tl)) :
(re().is_to_re(tl, s) ? m().mk_eq(s, str().mk_substr(a, len_hd, len_tl)) :
re().mk_in_re(str().mk_substr(a, len_hd, len_tl), tl)));
return BR_REWRITE_FULL;
}