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#5804

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This commit is contained in:
Nikolaj Bjorner 2022-01-31 10:16:09 -08:00
parent 913b90f7aa
commit 773e829c58
2 changed files with 26 additions and 32 deletions
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57
src/ast/rewriter/seq_rewriter.cpp
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@ -5531,44 +5531,37 @@ lbool seq_rewriter::eq_length(expr* x, expr* y) {
maximal length (the sequence is bounded).
*/
bool seq_rewriter::min_length(expr* e, unsigned& len) {
bool seq_rewriter::min_length(unsigned sz, expr* const* ss, unsigned& len) {
ptr_buffer<expr> es;
for (unsigned i = 0; i < sz; ++i)
es.push_back(ss[i]);
zstring s;
len = 0;
if (str().is_unit(e)) {
len = 1;
return true;
bool bounded = true;
while (!es.empty()) {
expr* e = es.back();
es.pop_back();
if (str().is_unit(e))
len += 1;
else if (str().is_empty(e))
continue;
else if (str().is_string(e, s))
len += s.length();
else if (str().is_concat(e))
for (expr* arg : *to_app(e))
es.push_back(arg);
else
bounded = false;
}
else if (str().is_empty(e)) {
len = 0;
return true;
}
else if (str().is_string(e, s)) {
len = s.length();
return true;
}
else if (str().is_concat(e)) {
unsigned min_l = 0;
bool bounded = true;
for (expr* arg : *to_app(e)) {
if (!min_length(arg, min_l))
bounded = false;
len += min_l;
}
return bounded;
}
return false;
return bounded;
}
bool seq_rewriter::min_length(expr* e, unsigned& len) {
return min_length(1, &e, len);
}
bool seq_rewriter::min_length(expr_ref_vector const& es, unsigned& len) {
unsigned min_l = 0;
bool bounded = true;
len = 0;
for (expr* arg : es) {
if (!min_length(arg, min_l))
bounded = false;
len += min_l;
}
return bounded;
return min_length(es.size(), es.data(), len);
}
bool seq_rewriter::max_length(expr* e, rational& len) {

1
src/ast/rewriter/seq_rewriter.h
View file

@ -322,6 +322,7 @@ class seq_rewriter {
bool reduce_eq_empty(expr* l, expr* r, expr_ref& result);
bool min_length(expr_ref_vector const& es, unsigned& len);
bool min_length(expr* e, unsigned& len);
bool min_length(unsigned sz, expr* const* es, unsigned& len);
bool max_length(expr* e, rational& len);
lbool eq_length(expr* x, expr* y);
expr* concat_non_empty(expr_ref_vector& es);