Remove value tag syntax ${ROOT} and ANONYMOUS prefix

Author: limpo1989

conf/bind.go

@@ -97,11 +97,6 @@ func (param *BindParam) BindTag(tag string, validate reflect.StructTag) error {
 	if err != nil {
 		return err
 	}
-	if parsedTag.Key == "ROOT" {
-		parsedTag.Key = ""
-	} else if parsedTag.Key == "" {
-		parsedTag.Key = "ANONYMOUS"
-	}
 	param.Tag = parsedTag
 	if param.Key == "" {
 		param.Key = parsedTag.Key

conf/bind_test.go

@@ -124,9 +124,9 @@ func TestBindTag(t *testing.T) {
 	err = param.BindTag("${}", "")
 	assert.Nil(t, err)
 	assert.Equal(t, param, BindParam{
-		Key: "ANONYMOUS",
+		Key: "",
 		Tag: ParsedTag{
-			Key: "ANONYMOUS",
+			Key: "",
 		},
 	})
 
@@ -136,14 +136,14 @@ func TestBindTag(t *testing.T) {
 	err = param.BindTag("${}", "")
 	assert.Nil(t, err)
 	assert.Equal(t, param, BindParam{
-		Key: "s.ANONYMOUS",
+		Key: "s",
 		Tag: ParsedTag{
-			Key: "ANONYMOUS",
+			Key: "",
 		},
 	})
 
 	param = BindParam{}
-	err = param.BindTag("${ROOT}", "")
+	err = param.BindTag("${}", "")
 	assert.Nil(t, err)
 	assert.Equal(t, param, BindParam{})
 
@@ -1162,7 +1162,7 @@ func TestBind_StructFilter(t *testing.T) {
 		param := BindParam{
 			Path: v.Type().String(),
 		}
-		err := param.BindTag("${ROOT}", "")
+		err := param.BindTag("${}", "")
 		assert.Nil(t, err)
 		filter := func(i interface{}, param BindParam) (bool, error) {
 			return false, errors.New("this is an error")
@@ -1180,7 +1180,7 @@ func TestBind_StructFilter(t *testing.T) {
 		param := BindParam{
 			Path: v.Type().String(),
 		}
-		err := param.BindTag("${ROOT}", "")
+		err := param.BindTag("${}", "")
 		assert.Nil(t, err)
 		filter := func(i interface{}, param BindParam) (bool, error) {
 			reflect.ValueOf(i).Elem().SetUint(3)
@@ -1200,7 +1200,7 @@ func TestBind_StructFilter(t *testing.T) {
 		param := BindParam{
 			Path: v.Type().String(),
 		}
-		err := param.BindTag("${ROOT}", "")
+		err := param.BindTag("${}", "")
 		assert.Nil(t, err)
 		filter := func(i interface{}, param BindParam) (bool, error) {
 			return false, nil

conf/conf.go

@@ -339,7 +339,7 @@ func (p *Properties) Bind(i interface{}, args ...BindArg) error {
 	}
 
 	if len(args) == 0 {
-		args = []BindArg{tagArg{tag: "${ROOT}"}}
+		args = []BindArg{tagArg{tag: "${}"}}
 	}
 
 	t := v.Type()