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code simplification, fix conflict in new_diseq_eh

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-04-21 10:17:43 +02:00
parent 352b14fe2b
commit 8cc85a7d7b
5 changed files with 47 additions and 47 deletions
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14
src/ast/rewriter/seq_rewriter.cpp
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@ -4147,6 +4147,20 @@ expr_ref seq_rewriter::mk_derivative_rec(expr* ele, expr* r) {
*************************************************/
expr_ref seq_rewriter::mk_symmetric_diff(expr* r1, expr* r2) {
expr_ref r(m());
if (r1 == r2)
r = re().mk_empty(r1->get_sort());
else if (re().is_empty(r1))
r = r2;
else if (re().is_empty(r2))
r = r1;
else
r = re().mk_union(re().mk_diff(r1, r2), re().mk_diff(r2, r1));
return r;
}
/*
* pattern match against all ++ "abc" ++ all ++ "def" ++ all regexes.
*/

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

@ -379,6 +379,8 @@ public:
return result;
}
expr_ref mk_symmetric_diff(expr *r1, expr *r2);
/**
* check if regular expression is of the form all ++ s ++ all ++ t + u ++ all, where, s, t, u are sequences
*/