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to_value.go
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/
to_value.go
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package types
import (
"fmt"
"reflect"
)
// ToValue converts an arbitrary value into *Value.
//
// See watson.Marshal for details.
func ToValue(v interface{}) (*Value, error) {
if v == nil {
return NewNilValue(), nil
}
switch v := v.(type) {
case bool:
return NewBoolValue(v), nil
case int:
return NewIntValue(int64(v)), nil
case int8:
return NewIntValue(int64(v)), nil
case int16:
return NewIntValue(int64(v)), nil
case int32:
return NewIntValue(int64(v)), nil
case int64:
return NewIntValue(v), nil
case uint:
return NewUintValue(uint64(v)), nil
case uint8:
return NewUintValue(uint64(v)), nil
case uint16:
return NewUintValue(uint64(v)), nil
case uint32:
return NewUintValue(uint64(v)), nil
case uint64:
return NewUintValue(uint64(v)), nil
case string:
return NewStringValue([]byte(v)), nil
case float32:
return NewFloatValue(float64(v)), nil
case float64:
return NewFloatValue(v), nil
}
if marshaler, ok := v.(Marshaler); ok {
return marshaler.MarshalWatson()
}
vv := reflect.ValueOf(v)
return ToValueByReflection(vv)
}
// `ToValueByReflection` does almost the same thing as `ToValue`, but it always uses reflection.
func ToValueByReflection(v reflect.Value) (*Value, error) {
if isMarshaler(v) {
return marshalerToValueByReflection(v)
} else if isIntFamily(v) {
return intToValueByReflection(v)
} else if isUintFamily(v) {
return uintToValueByReflection(v)
} else if isFloatFamily(v) {
return floatToValueByReflection(v)
} else if isBool(v) {
return boolToValueByReflection(v)
} else if isString(v) {
return stringToValueByReflection(v)
} else if isArray(v) {
return sliceOrArrayToValueByReflection(v)
} else if isStruct(v) {
return structToValueByReflection(v)
} else if isNil(v) {
// Marshalers should be placed before nil so as to handle `MarshalWatson` correctly.
return NewNilValue(), nil
// Maps, slices, and pointers should be placed after nil so as to convert nil into Nil correctly.
} else if isPtr(v) {
return ptrToValueByReflection(v)
} else if isMap(v) {
return mapToValueByReflection(v)
} else if isSlice(v) {
return sliceOrArrayToValueByReflection(v)
}
return nil, fmt.Errorf("can't convert %s to *Value", v.Type().String())
}
func intToValueByReflection(v reflect.Value) (*Value, error) {
return NewIntValue(v.Int()), nil
}
func uintToValueByReflection(v reflect.Value) (*Value, error) {
return NewUintValue(v.Uint()), nil
}
func floatToValueByReflection(v reflect.Value) (*Value, error) {
return NewFloatValue(v.Float()), nil
}
func boolToValueByReflection(v reflect.Value) (*Value, error) {
return NewBoolValue(v.Bool()), nil
}
func stringToValueByReflection(v reflect.Value) (*Value, error) {
return NewStringValue([]byte(v.String())), nil
}
func mapToValueByReflection(v reflect.Value) (*Value, error) {
var err error
obj := map[string]*Value{}
iter := v.MapRange()
for iter.Next() {
key := iter.Key()
k, ok := key.Interface().(string)
if !ok {
return nil, fmt.Errorf("can't convert %s to string", key.Type().String())
}
elem := iter.Value()
var elemVal *Value
if elem.CanInterface() {
elemVal, err = ToValue(elem.Interface())
} else {
elemVal, err = ToValueByReflection(elem)
}
if err != nil {
return nil, err
}
obj[k] = elemVal
}
return NewObjectValue(obj), nil
}
func sliceOrArrayToValueByReflection(v reflect.Value) (*Value, error) {
var err error
arr := []*Value{}
size := v.Len()
for i := 0; i < size; i++ {
elem := v.Index(i)
var elemVal *Value
if elem.CanInterface() {
elemVal, err = ToValue(elem.Interface())
} else {
elemVal, err = ToValueByReflection(elem)
}
if err != nil {
return nil, err
}
arr = append(arr, elemVal)
}
return NewArrayValue(arr), nil
}
func ptrToValueByReflection(v reflect.Value) (*Value, error) {
elem := v.Elem()
if elem.CanInterface() {
return ToValue(elem.Interface())
} else {
return ToValueByReflection(elem)
}
}
func structToValueByReflection(v reflect.Value) (*Value, error) {
obj := map[string]*Value{}
err := addFields(obj, v)
if err != nil {
return nil, err
}
return NewObjectValue(obj), nil
}
func addFields(obj map[string]*Value, v reflect.Value) error {
size := v.NumField()
t := v.Type()
for i := 0; i < size; i++ {
field := t.Field(i)
tag := parseTag(&field)
if tag.ShouldAlwaysOmit() {
continue
}
name := tag.Key()
elem := v.Field(i)
if tag.OmitEmpty() && elem.IsZero() {
continue
}
if tag.Inline() {
err := addFields(obj, elem)
if err != nil {
return err
}
} else if elem.CanInterface() {
elemVal, err := ToValue(elem.Interface())
if err != nil {
return err
}
obj[name] = elemVal
} else {
elemVal, err := ToValueByReflection(elem)
if err != nil {
return err
}
obj[name] = elemVal
}
}
return nil
}
func marshalerToValueByReflection(v reflect.Value) (*Value, error) {
marshal := v.MethodByName("MarshalWatson")
ret := marshal.Call([]reflect.Value{})
val := ret[0].Interface().(*Value)
if err, ok := ret[1].Interface().(error); ok {
return val, err
}
return val, nil
}