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str.at wants a special treatment...

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CEisenhofer 2026-04-02 18:33:44 +02:00
parent a8db876765
commit 34cb0a17fc
4 changed files with 10 additions and 6 deletions
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9
src/ast/euf/euf_sgraph.cpp
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@ -105,10 +105,10 @@ namespace euf {
return snode_kind::s_in_re;
// uninterpreted constants of string sort are variables
if (m_seq.is_seq(e->get_sort()) && (is_uninterp(e) || m_seq.is_skolem(e)))
if (m_seq.is_seq(e->get_sort()) && (is_uninterp(e) || m_seq.is_skolem(e) || m_seq.str.is_at(e)))
return snode_kind::s_var;
return snode_kind::s_var;
return snode_kind::s_unknown; // it is an element of the seq
}
void sgraph::compute_metadata(snode* n) {
@ -465,6 +465,8 @@ namespace euf {
snode* sgraph::mk_concat(snode* a, snode* b) {
if (a->is_empty()) return b;
if (b->is_empty()) return a;
SASSERT(a->kind() != snode_kind::s_unknown);
SASSERT(b->kind() != snode_kind::s_unknown);
if (m_seq.is_re(a->get_expr()))
return mk(expr_ref(m_seq.re.mk_concat(a->get_expr(), b->get_expr()), m));
return mk(expr_ref(m_seq.str.mk_concat(a->get_expr(), b->get_expr()), m));
@ -520,9 +522,6 @@ namespace euf {
return mk_concat(s1, s2);
return n;
}
// substitution can also work for expressions under unit.
if (n->is_unit() && n->arg(0) == var)
return mk(m_seq.str.mk_unit(replacement->get_expr()));
// for non-concat compound nodes (power, star, etc.), no substitution into children
return n;
}

1
src/ast/euf/euf_snode.h
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@ -53,6 +53,7 @@ namespace euf {
s_range, // character range [lo,hi] (OP_RE_RANGE)
s_to_re, // string to regex (OP_SEQ_TO_RE)
s_in_re, // regex membership (OP_SEQ_IN_RE)
s_unknown, // something else
};
class snode {