mirrors/z3
3
0
Fork 0
mirror of https://github.com/Z3Prover/z3 synced 2025-06-01 11:51:20 +00:00
Code Activity

fix #4006

Browse source 
Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2020-04-19 16:00:03 -07:00
parent f76c6424f2
commit eded7d023d
4 changed files with 181 additions and 146 deletions
Download patch file Download diff file Expand all files Collapse all files

155
src/smt/seq_eq_solver.cpp
View file

@ -1618,3 +1618,158 @@ bool theory_seq::is_unit_eq(expr_ref_vector const& ls, expr_ref_vector const& rs
return true;
}
/**
match X abc = defg Y, for abc, defg non-empty
*/
bool theory_seq::is_binary_eq(expr_ref_vector const& ls, expr_ref_vector const& rs, expr_ref& x, ptr_vector<expr>& xs, ptr_vector<expr>& ys, expr_ref& y) {
if (ls.size() > 1 && is_var(ls[0]) &&
rs.size() > 1 && is_var(rs.back())) {
xs.reset();
ys.reset();
x = ls[0];
y = rs.back();
for (unsigned i = 1; i < ls.size(); ++i) {
if (!m_util.str.is_unit(ls[i])) return false;
}
for (unsigned i = 0; i < rs.size()-1; ++i) {
if (!m_util.str.is_unit(rs[i])) return false;
}
xs.append(ls.size()-1, ls.c_ptr() + 1);
ys.append(rs.size()-1, rs.c_ptr());
return true;
}
return false;
}
/*
match: Description TBD
*/
bool theory_seq::is_quat_eq(expr_ref_vector const& ls, expr_ref_vector const& rs,
expr_ref& x1, expr_ref_vector& xs, expr_ref& x2,
expr_ref& y1, expr_ref_vector& ys, expr_ref& y2) {
if (ls.size() > 1 && is_var(ls[0]) && is_var(ls.back()) &&
rs.size() > 1 && is_var(rs[0]) && is_var(rs.back())) {
unsigned l_start = 1;
for (; l_start < ls.size()-1; ++l_start) {
if (m_util.str.is_unit(ls[l_start])) break;
}
if (l_start == ls.size()-1) return false;
unsigned l_end = l_start;
for (; l_end < ls.size()-1; ++l_end) {
if (!m_util.str.is_unit(ls[l_end])) break;
}
--l_end;
unsigned r_start = 1;
for (; r_start < rs.size()-1; ++r_start) {
if (m_util.str.is_unit(rs[r_start])) break;
}
if (r_start == rs.size()-1) return false;
unsigned r_end = r_start;
for (; r_end < rs.size()-1; ++r_end) {
if (!m_util.str.is_unit(rs[r_end])) break;
}
--r_end;
for (unsigned i = l_start; i < l_end+1; ++i) {
if (!m_util.str.is_unit(ls[i])) return false;
}
for (unsigned i = r_start; i < r_end+1; ++i) {
if (!m_util.str.is_unit(rs[i])) return false;
}
xs.reset();
xs.append(l_end-l_start+1, ls.c_ptr()+l_start);
x1 = m_util.str.mk_concat(l_start, ls.c_ptr());
x2 = m_util.str.mk_concat(ls.size()-l_end-1, ls.c_ptr()+l_end+1);
ys.reset();
ys.append(r_end-r_start+1, rs.c_ptr()+r_start);
y1 = m_util.str.mk_concat(r_start, rs.c_ptr());
y2 = m_util.str.mk_concat(rs.size()-r_end-1, rs.c_ptr()+r_end+1);
return true;
}
return false;
}
/*
match: Description TBD
*/
bool theory_seq::is_ternary_eq(expr_ref_vector const& ls, expr_ref_vector const& rs,
expr_ref& x, expr_ref_vector& xs, expr_ref& y1, expr_ref_vector& ys, expr_ref& y2, bool flag1) {
if (ls.size() > 1 && (is_var(ls[0]) || flag1) &&
rs.size() > 1 && is_var(rs[0]) && is_var(rs.back())) {
unsigned l_start = ls.size()-1;
for (; l_start > 0; --l_start) {
if (!m_util.str.is_unit(ls[l_start])) break;
}
if (l_start == ls.size()-1) return false;
++l_start;
unsigned r_end = rs.size()-2;
for (; r_end > 0; --r_end) {
if (m_util.str.is_unit(rs[r_end])) break;
}
if (r_end == 0) return false;
unsigned r_start = r_end;
for (; r_start > 0; --r_start) {
if (!m_util.str.is_unit(rs[r_start])) break;
}
++r_start;
for (unsigned i = l_start; i < ls.size(); ++i) {
if (!m_util.str.is_unit(ls[i])) return false;
}
for (unsigned i = r_start; i < r_end+1; ++i) {
if (!m_util.str.is_unit(rs[i])) return false;
}
xs.reset();
xs.append(ls.size()-l_start, ls.c_ptr()+l_start);
x = m_util.str.mk_concat(l_start, ls.c_ptr());
ys.reset();
ys.append(r_end-r_start+1, rs.c_ptr()+r_start);
y1 = m_util.str.mk_concat(r_start, rs.c_ptr());
y2 = m_util.str.mk_concat(rs.size()-r_end-1, rs.c_ptr()+r_end+1);
return true;
}
return false;
}
/*
match: Description TBD
*/
bool theory_seq::is_ternary_eq2(expr_ref_vector const& ls, expr_ref_vector const& rs,
expr_ref_vector& xs, expr_ref& x, expr_ref& y1, expr_ref_vector& ys, expr_ref& y2, bool flag1) {
if (ls.size() > 1 && (is_var(ls.back()) || flag1) &&
rs.size() > 1 && is_var(rs[0]) && is_var(rs.back())) {
unsigned l_start = 0;
for (; l_start < ls.size()-1; ++l_start) {
if (!m_util.str.is_unit(ls[l_start])) break;
}
if (l_start == 0) return false;
unsigned r_start = 1;
for (; r_start < rs.size()-1; ++r_start) {
if (m_util.str.is_unit(rs[r_start])) break;
}
if (r_start == rs.size()-1) return false;
unsigned r_end = r_start;
for (; r_end < rs.size()-1; ++r_end) {
if (!m_util.str.is_unit(rs[r_end])) break;
}
--r_end;
for (unsigned i = 0; i < l_start; ++i) {
if (!m_util.str.is_unit(ls[i])) return false;
}
for (unsigned i = r_start; i < r_end+1; ++i) {
if (!m_util.str.is_unit(rs[i])) return false;
}
xs.reset();
xs.append(l_start, ls.c_ptr());
x = m_util.str.mk_concat(ls.size()-l_start, ls.c_ptr()+l_start);
ys.reset();
ys.append(r_end-r_start+1, rs.c_ptr()+r_start);
y1 = m_util.str.mk_concat(r_start, rs.c_ptr());
y2 = m_util.str.mk_concat(rs.size()-r_end-1, rs.c_ptr()+r_end+1);
return true;
}
return false;
}