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reflect.go
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/
reflect.go
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package cli
import (
"errors"
"fmt"
"reflect"
)
func CombineStructs(structs ...interface{}) (interface{}, error) {
fields := []reflect.StructField{}
for _, s := range structs {
v := reflect.Indirect(reflect.ValueOf(s))
if v.Kind() != reflect.Struct {
return nil, fmt.Errorf("invalid value type, must be struct: %T", s)
}
t := v.Type()
for i := 0; i < v.NumField(); i++ {
fields = append(fields, t.Field(i))
}
}
result := reflect.New(reflect.StructOf(fields))
// Copy data
resultIndirect := reflect.Indirect(result)
for _, s := range structs {
v := reflect.Indirect(reflect.ValueOf(s))
for i := 0; i < v.NumField(); i++ {
src := v.Field(i)
dest := resultIndirect.FieldByName(v.Type().Field(i).Name)
dest.Set(src)
}
}
return result.Interface(), nil
}
func CopyStruct(src, dest interface{}) error {
destValue := reflect.Indirect(reflect.ValueOf(dest))
if !destValue.CanSet() {
return errors.New("unable to set destination, must be pointer")
}
if destValue.Kind() != reflect.Struct {
return fmt.Errorf("invalid value type, must be struct: %T", dest)
}
srcValue := reflect.Indirect(reflect.ValueOf(src))
if srcValue.Kind() != reflect.Struct {
return fmt.Errorf("invalid value type, must be struct: %T", src)
}
destType := destValue.Type()
for i := 0; i < destValue.NumField(); i++ {
dest := destValue.Field(i)
src := srcValue.FieldByName(destType.Field(i).Name)
if !src.IsValid() {
continue
}
if src.Type().AssignableTo(dest.Type()) {
dest.Set(src)
}
}
return nil
}