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use single return pattern

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-18 20:27:50 -07:00
parent bc03ffb800
commit 0f8f886389
1 changed files with 26 additions and 22 deletions
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44
src/ast/rewriter/seq_rewriter.cpp
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@ -2001,41 +2001,45 @@ expr_ref seq_rewriter::is_nullable(expr* r) {
SASSERT(m_util.is_re(r)); SASSERT(m_util.is_re(r));
expr* r1 = nullptr, *r2 = nullptr; expr* r1 = nullptr, *r2 = nullptr;
unsigned lo = 0, hi = 0; unsigned lo = 0, hi = 0;
expr_ref result(m());
if (m_util.re.is_concat(r, r1, r2) || if (m_util.re.is_concat(r, r1, r2) ||
m_util.re.is_intersection(r, r1, r2)) { m_util.re.is_intersection(r, r1, r2)) {
return expr_ref(mk_and(m(), is_nullable(r1), is_nullable(r2)), m()); result = mk_and(m(), is_nullable(r1), is_nullable(r2));
} }
if (m_util.re.is_union(r, r1, r2)) { else if (m_util.re.is_union(r, r1, r2)) {
return expr_ref(mk_or(m(), is_nullable(r1), is_nullable(r2)), m()); result = mk_or(m(), is_nullable(r1), is_nullable(r2));
} }
if (m_util.re.is_star(r) || else if (m_util.re.is_diff(r, r1, r2)) {
expr_ref e2(mk_not(m(), is_nullable(r2)), m());
result = mk_and(m(), is_nullable(r1), e2);
}
else if (m_util.re.is_star(r) ||
m_util.re.is_opt(r) || m_util.re.is_opt(r) ||
m_util.re.is_full_seq(r)) { m_util.re.is_full_seq(r) ||
return expr_ref(m().mk_true(), m()); (m_util.re.is_loop(r, r1, lo) && lo == 0) ||
(m_util.re.is_loop(r, r1, lo, hi) && lo == 0)) {
result = m().mk_true();
} }
if (m_util.re.is_full_char(r) || else if (m_util.re.is_full_char(r) ||
m_util.re.is_empty(r) || m_util.re.is_empty(r) ||
m_util.re.is_of_pred(r) || m_util.re.is_of_pred(r) ||
m_util.re.is_range(r)) { m_util.re.is_range(r)) {
return expr_ref(m().mk_false(), m()); result = m().mk_false();
} }
if (m_util.re.is_plus(r, r1)) { else if (m_util.re.is_plus(r, r1) ||
return is_nullable(r1); (m_util.re.is_loop(r, r1, lo) && lo > 0) ||
(m_util.re.is_loop(r, r1, lo, hi) && lo > 0)) {
result = is_nullable(r1);
} }
if (m_util.re.is_complement(r, r1)) { else if (m_util.re.is_complement(r, r1)) {
return expr_ref(mk_not(m(), is_nullable(r1)), m()); result = mk_not(m(), is_nullable(r1));
}
if (m_util.re.is_loop(r, r1, lo) || m_util.re.is_loop(r, r1, lo, hi)) {
if (lo == 0) {
return expr_ref(m().mk_true(), m());
} }
else { else {
return is_nullable(r1);
}
}
sort* seq_sort = nullptr; sort* seq_sort = nullptr;
VERIFY(m_util.is_re(r, seq_sort)); VERIFY(m_util.is_re(r, seq_sort));
return expr_ref(m_util.re.mk_in_re(m_util.str.mk_empty(seq_sort), r), m()); result = m_util.re.mk_in_re(m_util.str.mk_empty(seq_sort), r);
}
return result;
} }
br_status seq_rewriter::mk_str_in_regexp(expr* a, expr* b, expr_ref& result) { br_status seq_rewriter::mk_str_in_regexp(expr* a, expr* b, expr_ref& result) {