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add rewrites for #2575

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2019-09-20 02:16:22 -07:00
parent 78ed71b8de
commit 12034df11a
3 changed files with 70 additions and 0 deletions
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35
src/ast/seq_decl_plugin.cpp
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@ -1093,6 +1093,16 @@ app* seq_util::re::mk_loop(expr* r, unsigned lo, unsigned hi) {
return m.mk_app(m_fid, OP_RE_LOOP, 2, params, 1, &r);
}
app* seq_util::re::mk_loop(expr* r, expr* lo) {
expr* rs[2] = { r, lo };
return m.mk_app(m_fid, OP_RE_LOOP, 0, nullptr, 2, rs);
}
app* seq_util::re::mk_loop(expr* r, expr* lo, expr* hi) {
expr* rs[3] = { r, lo, hi };
return m.mk_app(m_fid, OP_RE_LOOP, 0, nullptr, 3, rs);
}
app* seq_util::re::mk_full_char(sort* s) {
return m.mk_app(m_fid, OP_RE_FULL_CHAR_SET, 0, nullptr, 0, nullptr, s);
}
@ -1129,3 +1139,28 @@ bool seq_util::re::is_loop(expr const* n, expr*& body, unsigned& lo) {
}
return false;
}
bool seq_util::re::is_loop(expr const* n, expr*& body, expr*& lo, expr*& hi) {
if (is_loop(n)) {
app const* a = to_app(n);
if (a->get_num_args() == 3) {
body = a->get_arg(0);
lo = a->get_arg(1);
hi = a->get_arg(2);
return true;
}
}
return false;
}
bool seq_util::re::is_loop(expr const* n, expr*& body, expr*& lo) {
if (is_loop(n)) {
app const* a = to_app(n);
if (a->get_num_args() == 2) {
body = a->get_arg(0);
lo = a->get_arg(1);
return true;
}
}
return false;
}