v0.0.470 Add GoextJsonMarshaller interface to call when marshalling json via gojson

goextVersion.go

@@ -1,5 +1,5 @@
 package goext
 
-const GoextVersion = "0.0.469"
+const GoextVersion = "0.0.470"
 
-const GoextVersionTimestamp = "2024-06-11T12:10:49+0200"
+const GoextVersionTimestamp = "2024-06-11T19:34:48+0200"

gojson/encode.go

@@ -769,6 +769,13 @@ type structFields struct {
 }
 
 func (se structEncoder) encode(e *encodeState, v reflect.Value, opts encOpts) {
+
+	if v.CanAddr() && v.Addr().Type().Implements(goextJsonMarshallerType) {
+		if gejm, ok := v.Addr().Interface().(GoextJsonMarshaller); ok {
+			gejm.PreGoJsonMarshal()
+		}
+	}
+
 	next := byte('{')
 FieldLoop:
 	for i := range se.fields.list {

gojson/interfaces.go

@@ -0,0 +1,13 @@
+package json
+
+import (
+	"reflect"
+)
+
+type GoextJsonMarshaller interface {
+	PreGoJsonMarshal()
+}
+
+var (
+	goextJsonMarshallerType = reflect.TypeOf((*GoextJsonMarshaller)(nil)).Elem()
+)

gojson/interfaces_test.go

@@ -0,0 +1,37 @@
+package json
+
+import (
+	"fmt"
+	"testing"
+)
+
+type testStruct1 struct {
+	TS2 *testStruct2 `json:"ts2"`
+}
+
+type testStruct2 struct {
+	A string `json:"a"`
+}
+
+func (t *testStruct2) PreGoJsonMarshal() {
+	t.A = "Hello"
+}
+
+func TestGoextJsonMarshaller(t *testing.T) {
+	t1 := testStruct1{TS2: &testStruct2{}}
+
+	v, err := Marshal(t1)
+	if err != nil {
+		t.Fatal()
+	}
+
+	fmt.Printf("%s\n", v)
+
+	if string(v) != `{"ts2":{"a":"Hello"}}` {
+		t.Fatalf("PreGoJsonMarshal failed")
+	}
+
+	if t1.TS2.A != "Hello" {
+		t.Fatalf("PreGoJsonMarshal failed")
+	}
+}