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Add comments and make implication into xor. Logically equivalent.

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Federico Mora 2019-11-26 20:20:10 -08:00 • committed by Nikolaj Bjorner
parent fc74689c1b
commit 6ffb475007
1 changed files with 6 additions and 4 deletions
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10
src/smt/theory_str.cpp
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@ -1879,11 +1879,13 @@ namespace smt {
expr_ref axiom1(ctx.mk_eq_atom(axiom1_lhs, axiom1_rhs), m);
SASSERT(axiom1);
assert_axiom(axiom1);
expr_ref zero(mk_string("0"), m);
expr_ref pref(u.str.mk_prefix(zero, ex), m);
assert_implication(pref, ctx.mk_eq_atom(ex, zero));
}
// axiom 2: (str.from-int N) should not result in a string with leading zeros.
expr_ref zero(mk_string("0"), m);
expr_ref pref(u.str.mk_prefix(zero, ex), m);
// The result does not start with a "0" xor the result is "0"
assert_axiom(m.mk_or(m.mk_and(mk_not(m, pref), ctx.mk_eq_atom(ex, zero)), m.mk_and(pref, mk_not(m, ctx.mk_eq_atom(ex, zero)))));
}
expr * theory_str::mk_RegexIn(expr * str, expr * regexp) {