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https://github.com/Z3Prover/z3
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parent
692f159af8
commit
5c04b9eee2
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@ -804,6 +804,7 @@ void seq_axioms::add_is_digit_axiom(expr* n) {
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/**
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len(e) = 1 => 0 <= to_code(e) <= max_code
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len(e) = 1 => from_code(to_code(e)) = e
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len(e) != 1 => to_code(e) = -1
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*/
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void seq_axioms::add_str_to_code_axiom(expr* n) {
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@ -812,6 +813,8 @@ void seq_axioms::add_str_to_code_axiom(expr* n) {
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literal len_is1 = mk_eq(mk_len(e), a.mk_int(1));
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add_axiom(~len_is1, mk_ge(n, 0));
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add_axiom(~len_is1, mk_le(n, seq.max_char()));
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if (!seq.str.is_from_code(e))
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add_axiom(~len_is1, mk_eq(e, seq.str.mk_from_code(n)));
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add_axiom(len_is1, mk_eq(n, a.mk_int(-1)));
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}
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@ -827,7 +830,8 @@ void seq_axioms::add_str_from_code_axiom(expr* n) {
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literal le = mk_le(e, seq.max_char());
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literal emp = mk_literal(seq.str.mk_is_empty(n));
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add_axiom(~ge, ~le, mk_eq(mk_len(n), a.mk_int(1)));
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add_axiom(~ge, ~le, mk_eq(seq.str.mk_to_code(n), e));
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if (!seq.str.is_to_code(e))
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add_axiom(~ge, ~le, mk_eq(seq.str.mk_to_code(n), e));
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add_axiom(ge, emp);
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add_axiom(le, emp);
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}
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