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add str.from-int in theory_str rewriter

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This commit is contained in:
Murphy Berzish 2016-11-09 15:54:22 -05:00
parent 4aa2d965b3
commit fff1fadf3b
4 changed files with 32 additions and 0 deletions
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22
src/ast/rewriter/str_rewriter.cpp
View file

@ -410,6 +410,25 @@ br_status str_rewriter::mk_str_to_int(expr * arg0, expr_ref & result) {
}
br_status str_rewriter::mk_str_from_int(expr * arg0, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (str.from-int " << mk_pp(arg0, m()) << ")" << std::endl;);
rational arg0Int;
if (m_autil.is_numeral(arg0, arg0Int)) {
// (str.from-int N) with N non-negative is the corresponding string in decimal notation.
// otherwise it is the empty string
if (arg0Int.is_nonneg()) {
std::string str = arg0Int.to_string();
result = m_strutil.mk_string(str);
TRACE("t_str_rw", tout << "convert non-negative integer constant to " << str << std::endl;);
} else {
result = m_strutil.mk_string("");
TRACE("t_str_rw", tout << "convert invalid integer constant to empty string" << std::endl;);
}
return BR_DONE;
}
return BR_FAILED;
}
br_status str_rewriter::mk_str_Substr(expr * base, expr * start, expr * len, expr_ref & result) {
TRACE("t_str_rw", tout << "rewrite (Substr " << mk_pp(base, m()) << " " << mk_pp(start, m()) << " " << mk_pp(len, m()) << ")" << std::endl;);
rational startVal, lenVal;
@ -559,6 +578,9 @@ br_status str_rewriter::mk_app_core(func_decl * f, unsigned num_args, expr * con
case OP_STR_STR2INT:
SASSERT(num_args == 1);
return mk_str_to_int(args[0], result);
case OP_STR_INT2STR:
SASSERT(num_args == 1);
return mk_str_from_int(args[0], result);
case OP_STR_SUBSTR:
SASSERT(num_args == 3);
return mk_str_Substr(args[0], args[1], args[2], result);

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

@ -54,6 +54,7 @@ public:
br_status mk_str_Replace(expr * base, expr * source, expr * target, expr_ref & result);
br_status mk_str_Substr(expr * base, expr * start, expr * len, expr_ref & result);
br_status mk_str_to_int(expr * arg0, expr_ref & result);
br_status mk_str_from_int(expr * arg0, expr_ref & result);
br_status mk_re_Str2Reg(expr * str, expr_ref & result);
br_status mk_re_RegexIn(expr * str, expr * re, expr_ref & result);

7
src/ast/str_decl_plugin.cpp
View file

@ -37,6 +37,7 @@ str_decl_plugin::str_decl_plugin():
m_substr_decl(0),
m_replace_decl(0),
m_str2int_decl(0),
m_int2str_decl(0),
m_re_str2regex_decl(0),
m_re_regexin_decl(0),
m_re_regexconcat_decl(0),
@ -69,6 +70,7 @@ void str_decl_plugin::finalize(void) {
DEC_REF(m_substr_decl);
DEC_REF(m_replace_decl);
DEC_REF(m_str2int_decl);
DEC_REF(m_int2str_decl);
DEC_REF(m_re_str2regex_decl);
DEC_REF(m_re_regexin_decl);
DEC_REF(m_re_regexconcat_decl);
@ -150,6 +152,9 @@ void str_decl_plugin::set_manager(ast_manager * m, family_id id) {
m_str2int_decl = m->mk_func_decl(symbol("str.to-int"), s, i, func_decl_info(id, OP_STR_STR2INT));
m_manager->inc_ref(m_str2int_decl);
m_int2str_decl = m->mk_func_decl(symbol("str.from-int"), i, s, func_decl_info(id, OP_STR_INT2STR));
m_manager->inc_ref(m_int2str_decl);
m_re_str2regex_decl = m->mk_func_decl(symbol("Str2Reg"), s, re, func_decl_info(id, OP_RE_STR2REGEX));
m_manager->inc_ref(m_re_str2regex_decl);
@ -202,6 +207,7 @@ func_decl * str_decl_plugin::mk_func_decl(decl_kind k) {
case OP_STR_SUBSTR: return m_substr_decl;
case OP_STR_REPLACE: return m_replace_decl;
case OP_STR_STR2INT: return m_str2int_decl;
case OP_STR_INT2STR: return m_int2str_decl;
case OP_RE_STR2REGEX: return m_re_str2regex_decl;
case OP_RE_REGEXIN: return m_re_regexin_decl;
case OP_RE_REGEXCONCAT: return m_re_regexconcat_decl;
@ -276,6 +282,7 @@ void str_decl_plugin::get_op_names(svector<builtin_name> & op_names, symbol cons
op_names.push_back(builtin_name("Substring", OP_STR_SUBSTR));
op_names.push_back(builtin_name("Replace", OP_STR_REPLACE));
op_names.push_back(builtin_name("str.to-int", OP_STR_STR2INT));
op_names.push_back(builtin_name("str.from-int", OP_STR_INT2STR));
op_names.push_back(builtin_name("Str2Reg", OP_RE_STR2REGEX));
op_names.push_back(builtin_name("RegexIn", OP_RE_REGEXIN));
op_names.push_back(builtin_name("RegexConcat", OP_RE_REGEXCONCAT));

2
src/ast/str_decl_plugin.h
View file

@ -43,6 +43,7 @@ enum str_op_kind {
OP_STR_REPLACE,
// string-integer conversion
OP_STR_STR2INT,
OP_STR_INT2STR,
// regular expression operators
OP_RE_STR2REGEX,
OP_RE_REGEXIN,
@ -76,6 +77,7 @@ protected:
func_decl * m_substr_decl;
func_decl * m_replace_decl;
func_decl * m_str2int_decl;
func_decl * m_int2str_decl;
func_decl * m_re_str2regex_decl;
func_decl * m_re_regexin_decl;