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decl and rewriter support for Contains (WIP)

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This commit is contained in:
Murphy Berzish 2016-06-14 18:36:43 -04:00
parent 989d6b577b
commit a3986d6d0e
4 changed files with 34 additions and 0 deletions
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24
src/ast/rewriter/str_rewriter.cpp
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@ -91,6 +91,27 @@ br_status str_rewriter::mk_str_EndsWith(expr * haystack, expr * needle, expr_ref
}
}
br_status str_rewriter::mk_str_Contains(expr * haystack, expr * needle, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (Contains " << mk_pp(haystack, m()) << " " << mk_pp(needle, m()) << ")" << std::endl;);
if (haystack == needle) {
TRACE("t_str_rw", tout << "eliminate (Contains) over identical terms" << std::endl;);
result = m().mk_true();
return BR_DONE;
} else if (m_strutil.is_string(haystack) && m_strutil.is_string(needle)) {
TRACE("t_str_rw", tout << "evaluating constant Contains predicate" << std::endl;);
std::string haystackStr = m_strutil.get_string_constant_value(haystack);
std::string needleStr = m_strutil.get_string_constant_value(needle);
if (haystackStr.find(needleStr) != std::string::npos) {
result = m().mk_true();
} else {
result = m().mk_false();
}
return BR_DONE;
} else {
return BR_FAILED;
}
}
br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * const * args, expr_ref & result) {
SASSERT(f->get_family_id() == get_fid());
@ -107,6 +128,9 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_ENDSWITH:
SASSERT(num_args == 2);
return mk_str_EndsWith(args[0], args[1], result);
case OP_STR_CONTAINS:
SASSERT(num_args == 2);
return mk_str_Contains(args[0], args[1], result);
default:
return BR_FAILED;
}

1
src/ast/rewriter/str_rewriter.h
View file

@ -43,6 +43,7 @@ public:
br_status mk_str_CharAt(expr * arg0, expr * arg1, expr_ref & result);
br_status mk_str_StartsWith(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_EndsWith(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_Contains(expr * haystack, expr * needle, expr_ref & result);
bool reduce_eq(expr * l, expr * r, expr_ref_vector & lhs, expr_ref_vector & rhs, bool & change);
bool reduce_eq(expr_ref_vector& ls, expr_ref_vector& rs, expr_ref_vector& lhs, expr_ref_vector& rhs, bool& change);