Support decoding of a struct nested into an array

CHANGELOG.md

@@ -1,3 +1,9 @@
+## 0.5.2
+
+Bugfixes:
+* Decoding a `<struct>` that is nested in `<array>` with variable types (e.g mix of ints, bool, string and structs) (#84).
+Structs will be decoded into a `map[string]any` type, as it's not possible to decode.
+
 ## 0.5.1
 
 Bugfixes:

decode.go

@@ -142,13 +142,24 @@ func (d *StdDecoder) decodeValue(value *ResponseValue, field reflect.Value) erro
 	// Struct decoding
 	case len(value.Struct) != 0:
 		fieldKind := field.Kind()
+		fieldType := field.Type()
+
+		if fieldKind == reflect.Interface {
+			// Create a new map[string]any and assign it to field
+			fieldType = reflect.TypeOf(map[string]any{})
+			fieldKind = reflect.Map
+
+			field.Set(reflect.MakeMap(fieldType))
+			field = field.Elem() // As the field is an interface, need to unwrap it
+		}
+
 		if fieldKind != reflect.Struct && fieldKind != reflect.Map {
 			return fmt.Errorf(errFormatInvalidFieldTypeOrType, reflect.Struct.String(), reflect.Map.String(), fieldKind.String())
 		}
 
 		// If we are targeting a map, it should be initialized
 		if fieldKind == reflect.Map {
-			if kt := field.Type().Key().Kind(); kt != reflect.String {
+			if kt := fieldType.Key().Kind(); kt != reflect.String {
 				return fmt.Errorf(errFormatInvalidMapKeyTypeForStruct, kt.String())
 			}
 
@@ -160,7 +171,7 @@ func (d *StdDecoder) decodeValue(value *ResponseValue, field reflect.Value) erro
 		for _, m := range value.Struct {
 			if fieldKind == reflect.Map {
 				mapKey := reflect.ValueOf(m.Name)
-				f := reflect.New(field.Type().Elem()).Elem()
+				f := reflect.New(fieldType.Elem()).Elem()
 
 				if err := d.decodeValue(&m.Value, f); err != nil {
 					return fmt.Errorf("failed decoding struct member '%s': %w", m.Name, err)

decode_test.go

@@ -622,6 +622,20 @@ func Test_structMemberToFieldName(t *testing.T) {
 	}
 }
 
+func Test_github(t *testing.T) {
+	dec := &StdDecoder{}
+	decodeTarget := struct {
+		Array []any
+	}{}
+
+	err := dec.DecodeRaw(loadTestFile(t, "response_array_mixed_with_struct.xml"), &decodeTarget)
+	require.NoError(t, err)
+	require.Equal(t, 3, len(decodeTarget.Array))
+	require.Equal(t, 200, decodeTarget.Array[0])
+	require.Equal(t, "OK", decodeTarget.Array[1])
+	require.Equal(t, "OK", decodeTarget.Array[2].(map[string]any)["status"])
+}
+
 func loadTestFile(t *testing.T, name string) []byte {
 	path := filepath.Join("testdata", name) // relative path
 

testdata/response_array_mixed_with_struct.xml

@@ -0,0 +1,29 @@
+<?xml version="1.0"?>
+<methodResponse>
+    <params>
+        <param>
+            <value>
+                <array>
+                    <data>
+                        <value>
+                            <i4>200</i4>
+                        </value>
+                        <value>OK</value>
+                        <value>
+                            <struct>
+                                <member>
+                                    <name>status</name>
+                                    <value>OK</value>
+                                </member>
+                                <member>
+                                    <name>contact</name>
+                                    <value>&lt;sip:raf@192.168.164.128:5060&gt;;expires=60</value>
+                                </member>
+                            </struct>
+                        </value>
+                    </data>
+                </array>
+            </value>
+        </param>
+    </params>
+</methodResponse>