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decl and rewriter support for LastIndexof in theory_str (WIP)

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This commit is contained in:
Murphy Berzish 2016-06-15 18:04:33 -04:00
parent dc5a334d42
commit 7c8b882ae6
4 changed files with 31 additions and 0 deletions
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21
src/ast/rewriter/str_rewriter.cpp
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@ -158,6 +158,24 @@ br_status str_rewriter::mk_str_Indexof2(expr * arg0, expr * arg1, expr * arg2, e
}
}
br_status str_rewriter::mk_str_LastIndexof(expr * haystack, expr * needle, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (LastIndexof " << 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 LastIndexof expression" << std::endl;);
std::string arg0Str = m_strutil.get_string_constant_value(haystack);
std::string arg1Str = m_strutil.get_string_constant_value(needle);
if (arg0Str.rfind(arg1Str) != std::string::npos) {
int index = arg0Str.rfind(arg1Str);
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());
@ -183,6 +201,9 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_INDEXOF2:
SASSERT(num_args == 3);
return mk_str_Indexof2(args[0], args[1], args[2], result);
case OP_STR_LASTINDEXOF:
SASSERT(num_args == 2);
return mk_str_LastIndexof(args[0], args[1], result);
default:
return BR_FAILED;
}

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

@ -46,6 +46,7 @@ public:
br_status mk_str_Contains(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_Indexof(expr * haystack, expr * needle, expr_ref & result);
br_status mk_str_Indexof2(expr * arg0, expr * arg1, expr * arg2, expr_ref & result);
br_status mk_str_LastIndexof(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);