/**
* private marshal
*/
func marshal(v reflect.Value, nullTag, boolTag string, buf *bytes.Buffer) error {
var err error
switch v.Kind() {
case reflect.Bool:
boolTrue := "true"
boolFalse := "false"
if "" != boolTag {
bs := strings.Split(boolTag, "|")
if 2 == len(bs) {
boolTrue = bs[0]
boolFalse = bs[1]
}
}
bv := v.Bool()
if bv {
buf.WriteString(boolTrue)
} else {
buf.WriteString(boolFalse)
}
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
b := strconv.AppendInt(scratch[:0], v.Int(), 10)
buf.Write(b)
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
b := strconv.AppendUint(scratch[:0], v.Uint(), 10)
buf.Write(b)
case reflect.Float32, reflect.Float64:
f := v.Float()
if math.IsInf(f, 0) || math.IsNaN(f) {
err = errors.New(strconv.FormatFloat(f, 'g', -1, v.Type().Bits()))
}
b := strconv.AppendFloat(scratch[:0], f, 'g', -1, v.Type().Bits())
buf.Write(b)
case reflect.String:
if 0 == v.Len() {
buf.WriteString("\"\"")
} else {
buf.WriteByte('"')
_, err = escapeString(buf, v.String())
buf.WriteByte('"')
}
case reflect.Struct:
vt := v.Type()
numTField := vt.NumField()
if 0 == numTField {
if "" != nullTag && 0 < buf.Len() {
buf.WriteString(nullTag)
}
break
}
if vt.Implements(textMarshalerType) {
imt := v.Interface().(encoding.TextMarshaler)
mt, e := imt.MarshalText()
if nil != e {
err = e
} else {
buf.WriteByte('"')
buf.Write(mt)
buf.WriteByte('"')
}
break
}
buf.WriteByte('{')
first := true
for i := 0; i < numTField; i++ {
childFieldT := vt.Field(i)
childFieldV := v.Field(i)
if "" == nullTag && SFReflectUtil.IsNullValue(childFieldV) {
continue
}
keyName := childFieldT.Tag.Get("json")
if 0 == len(keyName) {
keyName = childFieldT.Name
} else if "-" == keyName {
continue
}
if first {
first = false
} else {
buf.WriteByte(',')
}
buf.WriteString("\"" + keyName + "\"")
buf.WriteByte(':')
marshal(childFieldV, nullTag, boolTag, buf)
}
buf.WriteByte('}')
case reflect.Map:
if v.Type().Key().Kind() != reflect.String {
err = errors.New("json: unsupported type: " + v.Type().String())
break
}
if 0 == v.Len() {
if "" != nullTag && 0 < buf.Len() {
buf.WriteString(nullTag)
}
break
}
buf.WriteByte('{')
first := true
for _, k := range v.MapKeys() {
kv := v.MapIndex(k)
if "" == nullTag && SFReflectUtil.IsNullValue(kv) {
continue
}
if first {
first = false
} else {
buf.WriteByte(',')
}
buf.WriteString("\"" + k.String() + "\"")
buf.WriteByte(':')
marshal(kv, nullTag, boolTag, buf)
}
buf.WriteByte('}')
case reflect.Array, reflect.Slice:
if 0 == v.Len() {
if "" != nullTag && 0 < buf.Len() {
buf.WriteString(nullTag)
}
break
}
if v.Type().Elem().Kind() == reflect.Uint8 {
s := v.Bytes()
buf.WriteByte('"')
if len(s) < 1024 {
// for small buffers, using Encode directly is much faster.
dst := make([]byte, base64.StdEncoding.EncodedLen(len(s)))
base64.StdEncoding.Encode(dst, s)
buf.Write(dst)
} else {
// for large buffers, avoid unnecessary extra temporary
// buffer space.
enc := base64.NewEncoder(base64.StdEncoding, buf)
enc.Write(s)
enc.Close()
}
buf.WriteByte('"')
} else {
buf.WriteByte('[')
first := true
count := v.Len()
for i := 0; i < count; i++ {
v2 := v.Index(i)
if "" == nullTag && SFReflectUtil.IsNullValue(v2) {
continue
}
if first {
first = false
} else {
buf.WriteByte(',')
}
marshal(v2, nullTag, boolTag, buf)
}
buf.WriteByte(']')
}
case reflect.Interface, reflect.Ptr:
if v.IsNil() {
if "" != nullTag {
buf.WriteString(nullTag)
}
break
}
marshal(v.Elem(), nullTag, boolTag, buf)
default:
}
return err
}
