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rewrites for characters

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2022-07-02 11:37:21 -07:00
parent f20db3e644
commit 004139b320
3 changed files with 48 additions and 1 deletions
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36
src/ast/rewriter/char_rewriter.cpp
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@ -37,21 +37,57 @@ br_status char_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * co
case OP_CHAR_CONST:
break;
case OP_CHAR_LE:
st = mk_char_le(args[0], args[1], result);
break;
case OP_CHAR_TO_INT:
st = mk_char_to_int(args[0], result);
break;
case OP_CHAR_TO_BV:
st = mk_char_to_bv(args[0], result);
break;
case OP_CHAR_FROM_BV:
st = mk_char_from_bv(args[0], result);
break;
case OP_CHAR_IS_DIGIT:
st = mk_char_is_digit(args[0], result);
break;
}
return st;
}
br_status char_rewriter::mk_char_is_digit(expr* a, expr_ref& result) {
unsigned n;
if (!m_char->is_const_char(a, n))
return BR_FAILED;
result = m.mk_bool_val('0' <= n && n <= '9');
return BR_DONE;
}
br_status char_rewriter::mk_char_to_bv(expr* a, expr_ref& result) {
return BR_FAILED;
}
br_status char_rewriter::mk_char_le(expr* a, expr* b, expr_ref& result) {
unsigned na = 0, nb = 0;
if (m_char->is_const_char(a, na)) {
if (na == 0) {
result = m.mk_true();
return BR_DONE;
}
}
if (m_char->is_const_char(b, nb)) {
if (na != 0) {
result = m.mk_bool_val(na <= nb);
return BR_DONE;
}
if (nb == m_char->max_char()) {
result = m.mk_true();
return BR_DONE;
}
}
return BR_FAILED;
}
br_status char_rewriter::mk_char_from_bv(expr* e, expr_ref& result) {
bv_util bv(m);
rational n;