util/reflect: add IsZero helper

Signed-off-by: Vasiliy Tolstov <v.tolstov@unistack.org>
This commit is contained in:
Василий Толстов 2021-03-21 16:17:50 +03:00
parent c1dc041d8c
commit 8c95448535
2 changed files with 65 additions and 1 deletions

View File

@ -65,9 +65,26 @@ func IsEmpty(v reflect.Value) bool {
return v.IsNil()
case reflect.Invalid:
return true
}
case reflect.Struct:
var ok bool
for i := 0; i < v.NumField(); i++ {
ok = IsEmpty(v.FieldByIndex([]int{i}))
if !ok {
return false
}
}
default:
fmt.Printf("%#+v\n", v)
return false
}
return true
}
// IsZero returns true if struct is zero (not have any defined values)
func IsZero(src interface{}) bool {
v := reflect.ValueOf(src)
return IsEmpty(v)
}
// Zero creates new zero interface
func Zero(src interface{}) (interface{}, error) {

View File

@ -43,3 +43,50 @@ func TestURLVars(t *testing.T) {
}
_ = mp
}
func TestIsZero(t *testing.T) {
testStr1 := struct {
Name string
Value string
Nested struct {
NestedName string
}
}{
Name: "test_name",
Value: "test_value",
}
testStr1.Nested.NestedName = "nested_name"
if ok := IsZero(testStr1); ok {
t.Fatalf("zero ret on non zero struct: %#+v", testStr1)
}
testStr1.Name = ""
testStr1.Value = ""
testStr1.Nested.NestedName = ""
if ok := IsZero(testStr1); !ok {
t.Fatalf("non zero ret on zero struct: %#+v", testStr1)
}
type testStr3 struct {
Nested string
}
type testStr2 struct {
Name string
Nested *testStr3
}
vtest := &testStr2{
Name: "test_name",
Nested: &testStr3{Nested: "nested_name"},
}
if ok := IsZero(vtest); ok {
t.Fatalf("zero ret on non zero struct: %#+v", vtest)
}
vtest.Nested = nil
vtest.Name = ""
if ok := IsZero(vtest); !ok {
t.Fatalf("non zero ret on zero struct: %#+v", vtest)
}
//t.Logf("XX %#+v\n", ok)
}