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decl and rewriter for Indexof (WIP)

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This commit is contained in:
Murphy Berzish 2016-06-14 20:10:06 -04:00
parent 7aeeb599ef
commit db2a5854e9
4 changed files with 31 additions and 0 deletions
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21
src/ast/rewriter/str_rewriter.cpp
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@ -112,6 +112,24 @@ br_status str_rewriter::mk_str_Contains(expr * haystack, expr * needle, expr_ref
}
}
br_status str_rewriter::mk_str_Indexof(expr * haystack, expr * needle, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (Indexof " << mk_pp(haystack, m()) << " " << mk_pp(needle, m()) << ")" << std::endl;);
if (m_strutil.is_string(haystack) && m_strutil.is_string(needle)) {
TRACE("t_str_rw", tout << "evaluating constant Indexof expression" << 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) {
int index = haystackStr.find(needleStr);
result = m_autil.mk_numeral(rational(index), true);
} else {
result = m_autil.mk_numeral(rational(-1), true);
}
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());
@ -131,6 +149,9 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_CONTAINS:
SASSERT(num_args == 2);
return mk_str_Contains(args[0], args[1], result);
case OP_STR_INDEXOF:
SASSERT(num_args == 2);
return mk_str_Indexof(args[0], args[1], result);
default:
return BR_FAILED;
}

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

@ -44,6 +44,7 @@ public:
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);
br_status mk_str_Indexof(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);