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https://github.com/Z3Prover/z3
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parent
339a2568b2
commit
fcc34a07b2
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@ -401,15 +401,19 @@ void seq_axioms::add_last_indexof_axiom(expr* i) {
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}
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/*
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let r = replace(a, s, t)
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let r = replace(u, s, t)
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a = "" => s = "" or r = a
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contains(a, s) or r = a
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s = "" => r = t+a
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- if s is empty, the result is to prepend t to u;
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- if s does not occur in u then the result is u.
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s = "" => r = t+u
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u = "" => s = "" or r = u
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~contains(u,s) => r = u
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tightest_prefix(s, x)
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(contains(a, s) -> r = xty & a = xsy) &
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(!contains(a, s) -> r = a)
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contains(u, s) => r = xty & u = xsy
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~contains(u, s) => r = u
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*/
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void seq_axioms::add_replace_axiom(expr* r) {
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@ -419,14 +423,14 @@ void seq_axioms::add_replace_axiom(expr* r) {
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expr_ref y = m_sk.mk_indexof_right(u, s);
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expr_ref xty = mk_concat(x, t, y);
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expr_ref xsy = mk_concat(x, s, y);
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literal a_emp = mk_eq_empty(u, true);
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literal s_emp = mk_eq_empty(u, true);
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literal u_emp = mk_eq_empty(u, true);
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literal s_emp = mk_eq_empty(s, true);
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literal cnt = mk_literal(seq.str.mk_contains(u, s));
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add_axiom(~a_emp, s_emp, mk_seq_eq(r, u));
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add_axiom(cnt, mk_seq_eq(r, u));
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add_axiom(~s_emp, mk_seq_eq(r, mk_concat(t, u)));
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add_axiom(~cnt, a_emp, s_emp, mk_seq_eq(u, xsy));
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add_axiom(~cnt, a_emp, s_emp, mk_seq_eq(r, xty));
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add_axiom(~u_emp, s_emp, mk_seq_eq(r, u));
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add_axiom(cnt, mk_seq_eq(r, u));
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add_axiom(~cnt, u_emp, s_emp, mk_seq_eq(u, xsy));
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add_axiom(~cnt, u_emp, s_emp, mk_seq_eq(r, xty));
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ctx().force_phase(cnt);
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tightest_prefix(s, x);
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}
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