mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2026-03-20 20:05:51 +00:00
Code Activity

update generation of empty sequence to take sort argument, fix mk_concat substitution

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2026-03-13 10:00:23 -07:00
parent e384e8f3d4
commit df9df50a71
6 changed files with 146 additions and 121 deletions
Download patch file Download diff file Expand all files Collapse all files

18
src/ast/euf/euf_sgraph.cpp
View file

@ -461,21 +461,23 @@ namespace euf {
return mk(u);
}
snode* sgraph::mk_empty() {
expr_ref e(m_seq.str.mk_empty(m_str_sort), m);
snode* sgraph::mk_empty_seq(sort* s) {
expr_ref e(m_seq.str.mk_empty(s), m);
return mk(e);
}
snode* sgraph::mk_concat(snode* a, snode* b) {
if (a->is_empty()) return b;
if (b->is_empty()) return a;
expr_ref e(m_seq.str.mk_concat(a->get_expr(), b->get_expr()), m);
return mk(e);
if (m_seq.is_re(a->get_expr()))
return mk(expr_ref(m_seq.re.mk_concat(a->get_expr(), b->get_expr()), m));
else
return mk(expr_ref(m_seq.str.mk_concat(a->get_expr(), b->get_expr()), m));
}
snode* sgraph::drop_first(snode* n) {
if (n->is_empty() || n->is_token())
return mk_empty();
return mk_empty_seq(n->get_sort());
SASSERT(n->is_concat());
snode* l = n->arg(0);
snode* r = n->arg(1);
@ -486,7 +488,7 @@ namespace euf {
snode* sgraph::drop_last(snode* n) {
if (n->is_empty() || n->is_token())
return mk_empty();
return mk_empty_seq(n->get_sort());
SASSERT(n->is_concat());
snode* l = n->arg(0);
snode* r = n->arg(1);
@ -497,7 +499,7 @@ namespace euf {
snode* sgraph::drop_left(snode* n, unsigned count) {
if (count == 0 || n->is_empty()) return n;
if (count >= n->length()) return mk_empty();
if (count >= n->length()) return mk_empty_seq(n->get_sort());
for (unsigned i = 0; i < count; ++i)
n = drop_first(n);
return n;
@ -505,7 +507,7 @@ namespace euf {
snode* sgraph::drop_right(snode* n, unsigned count) {
if (count == 0 || n->is_empty()) return n;
if (count >= n->length()) return mk_empty();
if (count >= n->length()) return mk_empty_seq(n->get_sort());
for (unsigned i = 0; i < count; ++i)
n = drop_last(n);
return n;