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add some of the SMTLIB2.6 conventions and features to strings

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-05-16 14:00:02 -07:00
parent 1ab2ad07be
commit 4753d93bb7
4 changed files with 27 additions and 6 deletions
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5
src/ast/rewriter/seq_rewriter.cpp
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@ -2152,6 +2152,11 @@ br_status seq_rewriter::mk_re_inter(expr* a, expr* b, expr_ref& result) {
return BR_FAILED;
}
br_status seq_rewriter::mk_re_diff(expr* a, expr* b, expr_ref& result) {
result = m_util.re.mk_inter(a, m_util.re.mk_complement(b));
return BR_REWRITE2;
}
br_status seq_rewriter::mk_re_loop(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result) {
rational n1, n2;

1
src/ast/rewriter/seq_rewriter.h
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@ -157,6 +157,7 @@ class seq_rewriter {
br_status mk_re_inter(expr* a, expr* b, expr_ref& result);
br_status mk_re_complement(expr* a, expr_ref& result);
br_status mk_re_star(expr* a, expr_ref& result);
br_status mk_re_diff(expr* a, expr* b, expr_ref& result);
br_status mk_re_plus(expr* a, expr_ref& result);
br_status mk_re_opt(expr* a, expr_ref& result);
br_status mk_re_loop(func_decl* f, unsigned num_args, expr* const* args, expr_ref& result);