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clean up suffix/prefix rewriting

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2018-11-22 11:39:34 -08:00
parent 498fa87993
commit aeb4d1864d
3 changed files with 65 additions and 49 deletions
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5
src/ast/seq_decl_plugin.cpp
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@ -987,6 +987,11 @@ void seq_util::str::get_concat_units(expr* e, expr_ref_vector& es) const {
}
}
app* seq_util::str::mk_is_empty(expr* s) const {
return m.mk_eq(mk_empty(get_sort(s)), s);
}
app* seq_util::re::mk_loop(expr* r, unsigned lo) {
parameter param(lo);
return m.mk_app(m_fid, OP_RE_LOOP, 1, &param, 1, &r);