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|
package decoder
import (
"fmt"
"reflect"
"strconv"
)
var (
nilValue = reflect.ValueOf(nil)
)
func AssignValue(src, dst reflect.Value) error {
if dst.Type().Kind() != reflect.Ptr {
return fmt.Errorf("invalid dst type. required pointer type: %T", dst.Type())
}
casted, err := castValue(dst.Elem().Type(), src)
if err != nil {
return err
}
dst.Elem().Set(casted)
return nil
}
func castValue(t reflect.Type, v reflect.Value) (reflect.Value, error) {
switch t.Kind() {
case reflect.Int:
vv, err := castInt(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(int(vv.Int())), nil
case reflect.Int8:
vv, err := castInt(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(int8(vv.Int())), nil
case reflect.Int16:
vv, err := castInt(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(int16(vv.Int())), nil
case reflect.Int32:
vv, err := castInt(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(int32(vv.Int())), nil
case reflect.Int64:
return castInt(v)
case reflect.Uint:
vv, err := castUint(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(uint(vv.Uint())), nil
case reflect.Uint8:
vv, err := castUint(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(uint8(vv.Uint())), nil
case reflect.Uint16:
vv, err := castUint(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(uint16(vv.Uint())), nil
case reflect.Uint32:
vv, err := castUint(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(uint32(vv.Uint())), nil
case reflect.Uint64:
return castUint(v)
case reflect.Uintptr:
vv, err := castUint(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(uintptr(vv.Uint())), nil
case reflect.String:
return castString(v)
case reflect.Bool:
return castBool(v)
case reflect.Float32:
vv, err := castFloat(v)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(float32(vv.Float())), nil
case reflect.Float64:
return castFloat(v)
case reflect.Array:
return castArray(t, v)
case reflect.Slice:
return castSlice(t, v)
case reflect.Map:
return castMap(t, v)
case reflect.Struct:
return castStruct(t, v)
}
return v, nil
}
func castInt(v reflect.Value) (reflect.Value, error) {
switch v.Type().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return v, nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return reflect.ValueOf(int64(v.Uint())), nil
case reflect.String:
i64, err := strconv.ParseInt(v.String(), 10, 64)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(i64), nil
case reflect.Bool:
if v.Bool() {
return reflect.ValueOf(int64(1)), nil
}
return reflect.ValueOf(int64(0)), nil
case reflect.Float32, reflect.Float64:
return reflect.ValueOf(int64(v.Float())), nil
case reflect.Array:
if v.Len() > 0 {
return castInt(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to int64 from empty array")
case reflect.Slice:
if v.Len() > 0 {
return castInt(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to int64 from empty slice")
case reflect.Interface:
return castInt(reflect.ValueOf(v.Interface()))
case reflect.Map:
return nilValue, fmt.Errorf("failed to cast to int64 from map")
case reflect.Struct:
return nilValue, fmt.Errorf("failed to cast to int64 from struct")
case reflect.Ptr:
return castInt(v.Elem())
}
return nilValue, fmt.Errorf("failed to cast to int64 from %s", v.Type().Kind())
}
func castUint(v reflect.Value) (reflect.Value, error) {
switch v.Type().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return reflect.ValueOf(uint64(v.Int())), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return v, nil
case reflect.String:
u64, err := strconv.ParseUint(v.String(), 10, 64)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(u64), nil
case reflect.Bool:
if v.Bool() {
return reflect.ValueOf(uint64(1)), nil
}
return reflect.ValueOf(uint64(0)), nil
case reflect.Float32, reflect.Float64:
return reflect.ValueOf(uint64(v.Float())), nil
case reflect.Array:
if v.Len() > 0 {
return castUint(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to uint64 from empty array")
case reflect.Slice:
if v.Len() > 0 {
return castUint(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to uint64 from empty slice")
case reflect.Interface:
return castUint(reflect.ValueOf(v.Interface()))
case reflect.Map:
return nilValue, fmt.Errorf("failed to cast to uint64 from map")
case reflect.Struct:
return nilValue, fmt.Errorf("failed to cast to uint64 from struct")
case reflect.Ptr:
return castUint(v.Elem())
}
return nilValue, fmt.Errorf("failed to cast to uint64 from %s", v.Type().Kind())
}
func castString(v reflect.Value) (reflect.Value, error) {
switch v.Type().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return reflect.ValueOf(fmt.Sprint(v.Int())), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return reflect.ValueOf(fmt.Sprint(v.Uint())), nil
case reflect.String:
return v, nil
case reflect.Bool:
if v.Bool() {
return reflect.ValueOf("true"), nil
}
return reflect.ValueOf("false"), nil
case reflect.Float32, reflect.Float64:
return reflect.ValueOf(fmt.Sprint(v.Float())), nil
case reflect.Array:
if v.Len() > 0 {
return castString(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to string from empty array")
case reflect.Slice:
if v.Len() > 0 {
return castString(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to string from empty slice")
case reflect.Interface:
return castString(reflect.ValueOf(v.Interface()))
case reflect.Map:
return nilValue, fmt.Errorf("failed to cast to string from map")
case reflect.Struct:
return nilValue, fmt.Errorf("failed to cast to string from struct")
case reflect.Ptr:
return castString(v.Elem())
}
return nilValue, fmt.Errorf("failed to cast to string from %s", v.Type().Kind())
}
func castBool(v reflect.Value) (reflect.Value, error) {
switch v.Type().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
switch v.Int() {
case 0:
return reflect.ValueOf(false), nil
case 1:
return reflect.ValueOf(true), nil
}
return nilValue, fmt.Errorf("failed to cast to bool from %d", v.Int())
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
switch v.Uint() {
case 0:
return reflect.ValueOf(false), nil
case 1:
return reflect.ValueOf(true), nil
}
return nilValue, fmt.Errorf("failed to cast to bool from %d", v.Uint())
case reflect.String:
b, err := strconv.ParseBool(v.String())
if err != nil {
return nilValue, err
}
return reflect.ValueOf(b), nil
case reflect.Bool:
return v, nil
case reflect.Float32, reflect.Float64:
switch v.Float() {
case 0:
return reflect.ValueOf(false), nil
case 1:
return reflect.ValueOf(true), nil
}
return nilValue, fmt.Errorf("failed to cast to bool from %f", v.Float())
case reflect.Array:
if v.Len() > 0 {
return castBool(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to string from empty array")
case reflect.Slice:
if v.Len() > 0 {
return castBool(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to string from empty slice")
case reflect.Interface:
return castBool(reflect.ValueOf(v.Interface()))
case reflect.Map:
return nilValue, fmt.Errorf("failed to cast to string from map")
case reflect.Struct:
return nilValue, fmt.Errorf("failed to cast to string from struct")
case reflect.Ptr:
return castBool(v.Elem())
}
return nilValue, fmt.Errorf("failed to cast to bool from %s", v.Type().Kind())
}
func castFloat(v reflect.Value) (reflect.Value, error) {
switch v.Type().Kind() {
case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
return reflect.ValueOf(float64(v.Int())), nil
case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64, reflect.Uintptr:
return reflect.ValueOf(float64(v.Uint())), nil
case reflect.String:
f64, err := strconv.ParseFloat(v.String(), 64)
if err != nil {
return nilValue, err
}
return reflect.ValueOf(f64), nil
case reflect.Bool:
if v.Bool() {
return reflect.ValueOf(float64(1)), nil
}
return reflect.ValueOf(float64(0)), nil
case reflect.Float32, reflect.Float64:
return v, nil
case reflect.Array:
if v.Len() > 0 {
return castFloat(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to float64 from empty array")
case reflect.Slice:
if v.Len() > 0 {
return castFloat(v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to float64 from empty slice")
case reflect.Interface:
return castFloat(reflect.ValueOf(v.Interface()))
case reflect.Map:
return nilValue, fmt.Errorf("failed to cast to float64 from map")
case reflect.Struct:
return nilValue, fmt.Errorf("failed to cast to float64 from struct")
case reflect.Ptr:
return castFloat(v.Elem())
}
return nilValue, fmt.Errorf("failed to cast to float64 from %s", v.Type().Kind())
}
func castArray(t reflect.Type, v reflect.Value) (reflect.Value, error) {
kind := v.Type().Kind()
if kind == reflect.Interface {
return castArray(t, reflect.ValueOf(v.Interface()))
}
if kind != reflect.Slice && kind != reflect.Array {
return nilValue, fmt.Errorf("failed to cast to array from %s", kind)
}
if t.Elem() == v.Type().Elem() {
return v, nil
}
if t.Len() != v.Len() {
return nilValue, fmt.Errorf("failed to cast [%d]array from slice of %d length", t.Len(), v.Len())
}
ret := reflect.New(t).Elem()
for i := 0; i < v.Len(); i++ {
vv, err := castValue(t.Elem(), v.Index(i))
if err != nil {
return nilValue, err
}
ret.Index(i).Set(vv)
}
return ret, nil
}
func castSlice(t reflect.Type, v reflect.Value) (reflect.Value, error) {
kind := v.Type().Kind()
if kind == reflect.Interface {
return castSlice(t, reflect.ValueOf(v.Interface()))
}
if kind != reflect.Slice && kind != reflect.Array {
return nilValue, fmt.Errorf("failed to cast to slice from %s", kind)
}
if t.Elem() == v.Type().Elem() {
return v, nil
}
ret := reflect.MakeSlice(t, v.Len(), v.Len())
for i := 0; i < v.Len(); i++ {
vv, err := castValue(t.Elem(), v.Index(i))
if err != nil {
return nilValue, err
}
ret.Index(i).Set(vv)
}
return ret, nil
}
func castMap(t reflect.Type, v reflect.Value) (reflect.Value, error) {
ret := reflect.MakeMap(t)
switch v.Type().Kind() {
case reflect.Map:
iter := v.MapRange()
for iter.Next() {
key, err := castValue(t.Key(), iter.Key())
if err != nil {
return nilValue, err
}
value, err := castValue(t.Elem(), iter.Value())
if err != nil {
return nilValue, err
}
ret.SetMapIndex(key, value)
}
return ret, nil
case reflect.Interface:
return castMap(t, reflect.ValueOf(v.Interface()))
case reflect.Slice:
if v.Len() > 0 {
return castMap(t, v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to map from empty slice")
}
return nilValue, fmt.Errorf("failed to cast to map from %s", v.Type().Kind())
}
func castStruct(t reflect.Type, v reflect.Value) (reflect.Value, error) {
ret := reflect.New(t).Elem()
switch v.Type().Kind() {
case reflect.Map:
iter := v.MapRange()
for iter.Next() {
key := iter.Key()
k, err := castString(key)
if err != nil {
return nilValue, err
}
fieldName := k.String()
field, ok := t.FieldByName(fieldName)
if ok {
value, err := castValue(field.Type, iter.Value())
if err != nil {
return nilValue, err
}
ret.FieldByName(fieldName).Set(value)
}
}
return ret, nil
case reflect.Struct:
for i := 0; i < v.Type().NumField(); i++ {
name := v.Type().Field(i).Name
ret.FieldByName(name).Set(v.FieldByName(name))
}
return ret, nil
case reflect.Interface:
return castStruct(t, reflect.ValueOf(v.Interface()))
case reflect.Slice:
if v.Len() > 0 {
return castStruct(t, v.Index(0))
}
return nilValue, fmt.Errorf("failed to cast to struct from empty slice")
default:
return nilValue, fmt.Errorf("failed to cast to struct from %s", v.Type().Kind())
}
}
|
