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Revert is_concat changes, add ZIPT URL, implement snode/sgraph operations and tests

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- Revert is_str_concat/is_re_concat to original form (PR #8820 review)
- Add ZIPT URL (https://github.com/CEisenhofer/ZIPT) to euf_sgraph.h
- Add snode::at() for token indexing and collect_tokens() for enumeration
- Add sgraph factory methods: mk_var, mk_char, mk_empty, mk_concat
- Add sgraph drop operations: drop_first, drop_last, drop_left, drop_right
- Add sgraph substitution: subst(snode*, snode*, snode*)
- Add Brzozowski derivative via seq_rewriter::mk_derivative
- Add minterm computation from regex predicates
- Add 7 new unit tests covering all new operations with complex concats

Co-authored-by: NikolajBjorner <56730610+NikolajBjorner@users.noreply.github.com>
This commit is contained in:
copilot-swe-agent[bot] 2026-03-02 19:28:32 +00:00
parent 40b99311e3
commit 150f1fe2ea
5 changed files with 501 additions and 11 deletions
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16
src/ast/euf/euf_seq_plugin.h
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@ -93,22 +93,18 @@ namespace euf {
bool is_str_concat(enode* n) const { return m_seq.str.is_concat(n->get_expr()); }
bool is_str_concat(enode* n, enode*& a, enode*& b) {
expr* ea = nullptr, *eb = nullptr;
if (!m_seq.str.is_concat(n->get_expr(), ea, eb))
return false;
a = n->get_arg(0);
b = n->get_arg(1);
return true;
return m_seq.str.is_concat(n->get_expr(), ea, eb) &&
n->num_args() == 2 &&
(a = n->get_arg(0), b = n->get_arg(1), true);
}
// regex concat predicates
bool is_re_concat(enode* n) const { return m_seq.re.is_concat(n->get_expr()); }
bool is_re_concat(enode* n, enode*& a, enode*& b) {
expr* ea = nullptr, *eb = nullptr;
if (!m_seq.re.is_concat(n->get_expr(), ea, eb))
return false;
a = n->get_arg(0);
b = n->get_arg(1);
return true;
return m_seq.re.is_concat(n->get_expr(), ea, eb) &&
n->num_args() == 2 &&
(a = n->get_arg(0), b = n->get_arg(1), true);
}
// any concat, string or regex