Enumerator::ArithmeticSequence#inspect

static VALUE
arith_seq_inspect(VALUE self)
{
    struct enumerator *e;
    VALUE eobj, str;
    int range_p;

    TypedData_Get_Struct(self, struct enumerator, &enumerator_data_type, e);

    eobj = rb_attr_get(self, id_receiver);
    if (NIL_P(eobj)) {
        eobj = e->obj;
    }

    range_p = RTEST(rb_obj_is_kind_of(eobj, rb_cRange));
    str = rb_sprintf("(%s%"PRIsVALUE"%s.", range_p ? "(" : "", eobj, range_p ? ")" : "");

    rb_str_buf_append(str, rb_id2str(e->meth));
    append_method_args(eobj, str, e->args);

    rb_str_buf_cat2(str, ")");

    return str;
}