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package jsoninfo
import (
"encoding/json"
"fmt"
"reflect"
)
// MarshalStrictStruct function:
// * Marshals struct fields, ignoring MarshalJSON() and fields without 'json' tag.
// * Correctly handles StrictStruct semantics.
func MarshalStrictStruct(value StrictStruct) ([]byte, error) {
encoder := NewObjectEncoder()
if err := value.EncodeWith(encoder, value); err != nil {
return nil, err
}
return encoder.Bytes()
}
type ObjectEncoder struct {
result map[string]json.RawMessage
}
func NewObjectEncoder() *ObjectEncoder {
return &ObjectEncoder{
result: make(map[string]json.RawMessage, 8),
}
}
// Bytes returns the result of encoding.
func (encoder *ObjectEncoder) Bytes() ([]byte, error) {
return json.Marshal(encoder.result)
}
// EncodeExtension adds a key/value to the current JSON object.
func (encoder *ObjectEncoder) EncodeExtension(key string, value interface{}) error {
data, err := json.Marshal(value)
if err != nil {
return err
}
encoder.result[key] = data
return nil
}
// EncodeExtensionMap adds all properties to the result.
func (encoder *ObjectEncoder) EncodeExtensionMap(value map[string]json.RawMessage) error {
if value != nil {
result := encoder.result
for k, v := range value {
result[k] = v
}
}
return nil
}
func (encoder *ObjectEncoder) EncodeStructFieldsAndExtensions(value interface{}) error {
reflection := reflect.ValueOf(value)
// Follow "encoding/json" semantics
if reflection.Kind() != reflect.Ptr {
// Panic because this is a clear programming error
panic(fmt.Errorf("Value %s is not a pointer", reflection.Type().String()))
}
if reflection.IsNil() {
// Panic because this is a clear programming error
panic(fmt.Errorf("Value %s is nil", reflection.Type().String()))
}
// Take the element
reflection = reflection.Elem()
// Obtain typeInfo
typeInfo := GetTypeInfo(reflection.Type())
// Declare result
result := encoder.result
// Supported fields
iteration:
for _, field := range typeInfo.Fields {
// Fields without JSON tag are ignored
if !field.HasJSONTag {
continue
}
// Marshal
fieldValue := reflection.FieldByIndex(field.Index)
if v, ok := fieldValue.Interface().(json.Marshaler); ok {
if fieldValue.Kind() == reflect.Ptr && fieldValue.IsNil() {
if field.JSONOmitEmpty {
continue iteration
}
result[field.JSONName] = []byte("null")
continue
}
fieldData, err := v.MarshalJSON()
if err != nil {
return err
}
result[field.JSONName] = fieldData
continue
}
switch fieldValue.Kind() {
case reflect.Ptr, reflect.Interface:
if fieldValue.IsNil() {
if field.JSONOmitEmpty {
continue iteration
}
result[field.JSONName] = []byte("null")
continue
}
case reflect.Struct:
case reflect.Map:
if field.JSONOmitEmpty && (fieldValue.IsNil() || fieldValue.Len() == 0) {
continue iteration
}
case reflect.Slice:
if field.JSONOmitEmpty && fieldValue.Len() == 0 {
continue iteration
}
case reflect.Bool:
x := fieldValue.Bool()
if field.JSONOmitEmpty && !x {
continue iteration
}
s := "false"
if x {
s = "true"
}
result[field.JSONName] = []byte(s)
continue iteration
case reflect.Int64, reflect.Int, reflect.Int32:
if field.JSONOmitEmpty && fieldValue.Int() == 0 {
continue iteration
}
case reflect.Uint64, reflect.Uint, reflect.Uint32:
if field.JSONOmitEmpty && fieldValue.Uint() == 0 {
continue iteration
}
case reflect.Float64:
if field.JSONOmitEmpty && fieldValue.Float() == 0.0 {
continue iteration
}
case reflect.String:
if field.JSONOmitEmpty && len(fieldValue.String()) == 0 {
continue iteration
}
default:
panic(fmt.Errorf("Field '%s' has unsupported type %s", field.JSONName, field.Type.String()))
}
// No special treament is needed
// Use plain old "encoding/json".Marshal
fieldData, err := json.Marshal(fieldValue.Addr().Interface())
if err != nil {
return err
}
result[field.JSONName] = fieldData
}
return nil
}
|
