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wip(seq): clean_leaf cofactors, mk_union_core simplifications, re_is_empty antimirov emptiness check

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Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
This commit is contained in:
Margus Veanes 2026-06-26 00:36:14 +03:00
parent 3d42d997c6
commit 149549b946
7 changed files with 216 additions and 22 deletions
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7
src/ast/rewriter/seq_derive.h
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@ -167,6 +167,13 @@ namespace seq {
// Cofactor enumeration over a transition regex (ITE-tree).
void get_cofactors_rec(expr* r, expr_ref_pair_vector& result);
// Re-apply union/intersection simplifications bottom-up to a cofactor
// leaf. decompose_ite substitutes ITE branch values structurally
// (no simplification), so leaves can contain un-normalized nodes such
// as union(R, none) or inter(R, none); this rebuilds them through
// mk_union/mk_inter so equal states share a canonical form.
expr_ref clean_leaf(expr* r);
sort* re_sort(expr* r) { return r->get_sort(); }
sort* seq_sort(expr* r) { sort* s = nullptr; m_util.is_re(r, s); return s; }
sort* ele_sort(expr* r) { sort* s = seq_sort(r); sort* e = nullptr; m_util.is_seq(s, e); return e; }