/
variant.go
185 lines (169 loc) · 3.75 KB
/
variant.go
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package variant
import (
"errors"
"git.golaxy.org/core/util/uid"
"git.golaxy.org/framework/util/binaryutil"
"reflect"
)
// Variant 可变类型
type Variant struct {
TypeId TypeId // 类型Id
Value ValueReader // 读取值
Reflected reflect.Value // 反射值
}
// Read implements io.Reader
func (v Variant) Read(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
if _, err := binaryutil.ReadFrom(&bs, v.TypeId); err != nil {
return bs.BytesWritten(), err
}
if v.Value == nil {
return bs.BytesWritten(), errors.New("value is nil")
}
if _, err := binaryutil.ReadFrom(&bs, v.Value); err != nil {
return bs.BytesWritten(), err
}
return bs.BytesWritten(), nil
}
// Write implements io.Writer
func (v *Variant) Write(p []byte) (int, error) {
bs := binaryutil.NewBigEndianStream(p)
if _, err := bs.WriteTo(&v.TypeId); err != nil {
return bs.BytesRead(), err
}
reflected, err := v.TypeId.NewReflected()
if err != nil {
return bs.BytesRead(), err
}
value := reflected.Interface().(Value)
if _, err := bs.WriteTo(value); err != nil {
return bs.BytesRead(), err
}
v.Value = value
v.Reflected = reflected
return bs.BytesRead(), nil
}
// Size 大小
func (v Variant) Size() int {
n := v.TypeId.Size()
if v.Value != nil {
n += v.Value.Size()
}
return n
}
// MakeVariant 创建可变类型
func MakeVariant(v ValueReader) (Variant, error) {
if v == nil {
return Variant{}, errors.New("v is nil")
}
return Variant{
TypeId: v.Type(),
Value: v,
}, nil
}
// CastVariant 转换为可变类型
func CastVariant(a any) (Variant, error) {
retry:
switch v := a.(type) {
case int:
return MakeVariant(Int(v))
case *int:
return MakeVariant((*Int)(v))
case int8:
return MakeVariant(Int8(v))
case *int8:
return MakeVariant((*Int8)(v))
case int16:
return MakeVariant(Int16(v))
case *int16:
return MakeVariant((*Int16)(v))
case int32:
return MakeVariant(Int32(v))
case *int32:
return MakeVariant((*Int32)(v))
case int64:
return MakeVariant(Int64(v))
case *int64:
return MakeVariant((*Int64)(v))
case uint:
return MakeVariant(Uint(v))
case *uint:
return MakeVariant((*Uint)(v))
case uint8:
return MakeVariant(Uint8(v))
case *uint8:
return MakeVariant((*Uint8)(v))
case uint16:
return MakeVariant(Uint16(v))
case *uint16:
return MakeVariant((*Uint16)(v))
case uint32:
return MakeVariant(Uint32(v))
case *uint32:
return MakeVariant((*Uint32)(v))
case uint64:
return MakeVariant(Uint64(v))
case *uint64:
return MakeVariant((*Uint64)(v))
case float32:
return MakeVariant(Float(v))
case *float32:
return MakeVariant((*Float)(v))
case float64:
return MakeVariant(Double(v))
case *float64:
return MakeVariant((*Double)(v))
case bool:
return MakeVariant(Bool(v))
case *bool:
return MakeVariant((*Bool)(v))
case []byte:
return MakeVariant(Bytes(v))
case *[]byte:
return MakeVariant((*Bytes)(v))
case string:
return MakeVariant(String(v))
case *string:
return MakeVariant((*String)(v))
case uid.Id:
return MakeVariant(String(v))
case *uid.Id:
return MakeVariant((*String)(v))
case nil:
return MakeVariant(Null{})
case Array:
return MakeVariant(v)
case *Array:
return MakeVariant(v)
case Map:
return MakeVariant(v)
case *Map:
return MakeVariant(v)
case Variant:
return v, nil
case *Variant:
return *v, nil
case Error:
return MakeVariant(v)
case *Error:
return MakeVariant(v)
case error:
return MakeVariant(MakeError(v))
case ValueReader:
return MakeVariant(v)
case reflect.Value:
if !v.CanInterface() {
return Variant{}, ErrNotVariant
}
a = v.Interface()
goto retry
case *reflect.Value:
if !v.CanInterface() {
return Variant{}, ErrNotVariant
}
a = v.Interface()
goto retry
default:
return Variant{}, ErrNotVariant
}
}