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some fixes

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-17 07:33:43 -07:00
parent 501aa7927d
commit a83f72b657
6 changed files with 30 additions and 16 deletions
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14
src/smt/seq_skolem.cpp
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@ -12,6 +12,7 @@ Author:
--*/
#include "smt/seq_skolem.h"
#include "ast/ast_pp.h"
using namespace smt;
@ -60,6 +61,8 @@ void seq_skolem::decompose(expr* e, expr_ref& head, expr_ref& tail) {
expr* e1 = nullptr, *e2 = nullptr;
zstring s;
rational r;
decompose_main:
if (seq.str.is_empty(e)) {
head = seq.str.mk_unit(seq.str.mk_nth(e, a.mk_int(0)));
tail = e;
@ -69,11 +72,13 @@ void seq_skolem::decompose(expr* e, expr_ref& head, expr_ref& tail) {
tail = seq.str.mk_string(s.extract(1, s.length()-1));
}
else if (seq.str.is_unit(e)) {
head = e;
head = e;
tail = seq.str.mk_empty(m.get_sort(e));
m_rewrite(head);
}
else if (seq.str.is_concat(e, e1, e2) && seq.str.is_empty(e1)) {
decompose(e2, head, tail);
e = e2;
goto decompose_main;
}
else if (seq.str.is_concat(e, e1, e2) && seq.str.is_string(e1, s) && s.length() > 0) {
head = seq.str.mk_unit(seq.str.mk_char(s, 0));
@ -82,6 +87,8 @@ void seq_skolem::decompose(expr* e, expr_ref& head, expr_ref& tail) {
else if (seq.str.is_concat(e, e1, e2) && seq.str.is_unit(e1)) {
head = e1;
tail = e2;
m_rewrite(head);
m_rewrite(tail);
}
else if (is_skolem(m_tail, e) && a.is_numeral(to_app(e)->get_arg(1), r)) {
expr* s = to_app(e)->get_arg(0);
@ -92,8 +99,9 @@ void seq_skolem::decompose(expr* e, expr_ref& head, expr_ref& tail) {
}
else {
head = seq.str.mk_unit(seq.str.mk_nth(e, a.mk_int(0)));
m_rewrite(head);
tail = mk(m_tail, e, a.mk_int(0));
m_rewrite(head);
m_rewrite(tail);
}
}