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fix string rewriting according to definition. Relates to examples in #1202

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-08-13 17:21:38 -07:00
parent ead704f52f
commit fb17362dff
1 changed files with 12 additions and 11 deletions
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23
src/ast/rewriter/seq_rewriter.cpp
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@ -1072,26 +1072,27 @@ br_status seq_rewriter::mk_seq_suffix(expr* a, expr* b, expr_ref& result) {
br_status seq_rewriter::mk_str_itos(expr* a, expr_ref& result) {
rational r;
if (m_autil.is_numeral(a, r)) {
result = m_util.str.mk_string(symbol(r.to_string().c_str()));
if (r.is_int() && !r.is_neg()) {
result = m_util.str.mk_string(symbol(r.to_string().c_str()));
}
else {
result = m_util.str.mk_string(symbol(""));
}
return BR_DONE;
}
return BR_FAILED;
}
br_status seq_rewriter::mk_str_stoi(expr* a, expr_ref& result) {
zstring str;
if (m_util.str.is_string(a, str)) {
std::string s = str.encode();
if (s.length() == 0) {
result = m_autil.mk_int(-1);
return BR_DONE;
}
for (unsigned i = 0; i < s.length(); ++i) {
if (s[i] == '-') {
if (i != 0) {
result = m_autil.mk_int(-1);
return BR_DONE;
}
}
else if ('0' <= s[i] && s[i] <= '9') {
continue;
}
else {
if (!('0' <= s[i] && s[i] <= '9')) {
result = m_autil.mk_int(-1);
return BR_DONE;
}