NValue
n_symbol_pool_get_symbol(const char* contents, NError* error) {
n_error_clear(error);
if (contents != NULL) {
int32_t index = _find_symbol(contents);
if (index < 0) {
const char* dup_contents = duplicate_string(contents);
if (dup_contents == NULL) {
n_error_set(error, N_E_BAD_ALLOCATION);
n_error_set_msg(error, "contents");
return N_UNDEFINED;
}
index = n_symbol_array_append(&_pool, dup_contents);
if (index < 0) {
n_error_set(error, N_E_BAD_ALLOCATION);
n_error_set_msg(error, "inner-pool");
return N_UNDEFINED;
}
}
return n_wrap_symbol(index);
}
else {
n_error_set(error, N_E_INVALID_ARGUMENT);
n_error_set_msg(error, "contents");
return N_UNDEFINED;
}
}
var_info Symbol_Table::insert_symbol(std::string s, oper_type o){
//find variable
int level;
var_info result = _find_symbol(s, &level);
if (result.type != EMP && level == 0){
return{ USD, result.name };
}
else{
std::stringstream var_name;
var_name << "var" << var_count++;
scopes.back().insert(std::pair<std::string, var_info>(s, { o, var_name.str() }));
return{ o, var_name.str() };
}
}
var_info Symbol_Table::find_symbol(std::string s){
int level;
return _find_symbol(s, &level);
}