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fix #1937

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-11-14 11:31:39 -08:00
parent 9b4cf1559d
commit 52910fa465
2 changed files with 18 additions and 5 deletions
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12
src/ast/rewriter/seq_rewriter.cpp
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@ -561,6 +561,7 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
zstring s;
rational pos, len;
TRACE("seq", tout << mk_pp(a, m()) << " " << mk_pp(b, m()) << " " << mk_pp(c, m()) << "\n";);
bool constantBase = m_util.str.is_string(a, s);
bool constantPos = m_autil.is_numeral(b, pos);
bool constantLen = m_autil.is_numeral(c, len);
@ -599,6 +600,10 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
SASSERT(_len > 0);
expr_ref_vector as(m()), bs(m());
m_util.str.get_concat(a, as);
if (as.empty()) {
result = a;
return BR_DONE;
}
for (unsigned i = 0; i < as.size() && _len > 0; ++i) {
if (m_util.str.is_unit(as[i].get())) {
if (_pos == 0) {
@ -613,7 +618,12 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
return BR_FAILED;
}
}
result = m_util.str.mk_concat(bs);
if (bs.empty()) {
result = m_util.str.mk_empty(m().get_sort(a));
}
else {
result = m_util.str.mk_concat(bs);
}
return BR_DONE;
}