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kleene

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-18 19:35:31 -07:00
parent fcd2bc605c
commit 5bbf05c93c
2 changed files with 12 additions and 0 deletions
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10
src/ast/rewriter/seq_rewriter.cpp
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@ -1983,6 +1983,16 @@ bool seq_rewriter::get_head_tail(expr* s, expr_ref& head, expr_ref& tail) {
return false;
}
expr_ref seq_rewriter::kleene_and(expr* cond, expr* r) {
expr* re_empty = m_util.re.mk_empty(m().get_sort(r));
return expr_ref(m().mk_ite(cond, r, re_empty), m());
}
expr_ref seq_rewriter::kleene_predicate(expr* cond, sort* seq_sort) {
expr* re_with_empty = m_util.re.mk_to_re(m_util.str.mk_empty(seq_sort));
return kleene_and(cond, re_with_empty);
}
expr_ref seq_rewriter::is_nullable(expr* r) {
SASSERT(m_util.is_re(r));
expr* r1 = nullptr, *r2 = nullptr;

2
src/ast/rewriter/seq_rewriter.h
View file

@ -134,6 +134,8 @@ class seq_rewriter {
bool get_head_tail(expr* e, expr_ref& head, expr_ref& tail);
expr_ref is_nullable(expr* r);
expr_ref kleene_and(expr* cond, expr* r);
expr_ref kleene_predicate(expr* cond, sort* seq_sort);
br_status mk_seq_unit(expr* e, expr_ref& result);
br_status mk_seq_concat(expr* a, expr* b, expr_ref& result);