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add index option to 'eval' command for box objectives. Issue #955

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-03-31 09:22:56 -07:00
parent 8f798fef1a
commit 582880346e
2 changed files with 66 additions and 9 deletions
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66
src/ast/rewriter/seq_rewriter.cpp
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@ -12,6 +12,7 @@ Abstract:
Author:
Nikolaj Bjorner (nbjorner) 2015-12-5
Murphy Berzish 2017-02-21
Notes:
@ -514,30 +515,56 @@ br_status seq_rewriter::mk_seq_extract(expr* a, expr* b, expr* c, expr_ref& resu
bool constantPos = m_autil.is_numeral(b, pos);
bool constantLen = m_autil.is_numeral(c, len);
// case 1: pos<0 or len<0
// case 1: pos<0 or len<=0
// rewrite to ""
if ( (constantPos && pos.is_neg()) || (constantLen && len.is_neg()) ) {
if ( (constantPos && pos.is_neg()) || (constantLen && !len.is_pos()) ) {
result = m_util.str.mk_empty(m().get_sort(a));
return BR_DONE;
}
// case 1.1: pos >= length(base)
// rewrite to ""
if (constantBase && constantPos && pos.get_unsigned() >= s.length()) {
if (constantBase && constantPos && pos >= rational(s.length())) {
result = m_util.str.mk_empty(m().get_sort(a));
return BR_DONE;
}
constantPos &= pos.is_unsigned();
constantLen &= len.is_unsigned();
if (constantBase && constantPos && constantLen) {
if (pos.get_unsigned() + len.get_unsigned() >= s.length()) {
// case 2: pos+len goes past the end of the string
unsigned _len = s.length() - pos.get_unsigned() + 1;
result = m_util.str.mk_string(s.extract(pos.get_unsigned(), _len));
return BR_DONE;
} else {
// case 3: pos+len still within string
result = m_util.str.mk_string(s.extract(pos.get_unsigned(), len.get_unsigned()));
return BR_DONE;
}
return BR_DONE;
}
if (constantPos && constantLen) {
unsigned _pos = pos.get_unsigned();
unsigned _len = len.get_unsigned();
SASSERT(_len > 0);
expr_ref_vector as(m()), bs(m());
m_util.str.get_concat(a, as);
for (unsigned i = 0; i < as.size() && _len > 0; ++i) {
if (m_util.str.is_unit(as[i].get())) {
if (_pos == 0) {
bs.push_back(as[i].get());
--_len;
}
else {
--_pos;
}
}
else {
return BR_FAILED;
}
}
result = m_util.str.mk_concat(bs);
return BR_DONE;
}
return BR_FAILED;
@ -640,10 +667,33 @@ br_status seq_rewriter::mk_seq_at(expr* a, expr* b, expr_ref& result) {
result = m_util.str.mk_empty(m().get_sort(a));
return BR_DONE;
}
if (m_util.str.is_string(a, c) && r.is_unsigned() && r < rational(c.length())) {
result = m_util.str.mk_string(c.extract(r.get_unsigned(), 1));
if (m_util.str.is_string(a, c)) {
if (r.is_unsigned() && r < rational(c.length())) {
result = m_util.str.mk_string(c.extract(r.get_unsigned(), 1));
}
else {
result = m_util.str.mk_empty(m().get_sort(a));
}
return BR_DONE;
}
}
if (r.is_unsigned()) {
len = r.get_unsigned();
expr_ref_vector as(m());
m_util.str.get_concat(a, as);
for (unsigned i = 0; i < as.size(); ++i) {
if (m_util.str.is_unit(as[i].get())) {
if (len == 0) {
result = as[i].get();
return BR_DONE;
}
--len;
}
else {
return BR_FAILED;
}
}
}
}
return BR_FAILED;
}