88 lines
1.8 KiB
Go
88 lines
1.8 KiB
Go
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// Copyright © 2016 Abcum Ltd
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package deep
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import (
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"reflect"
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)
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// Copy returns a deep copy of the source object.
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func Copy(src interface{}) interface{} {
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if src == nil {
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return nil
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}
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prime := reflect.ValueOf(src)
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clone := reflect.New(prime.Type()).Elem()
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copy(prime, clone)
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return clone.Interface()
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}
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func copy(prime, clone reflect.Value) {
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switch prime.Kind() {
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case reflect.Ptr:
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value := prime.Elem()
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if !value.IsValid() {
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return
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}
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clone.Set(reflect.New(value.Type()))
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copy(value, clone.Elem())
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case reflect.Interface:
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if prime.IsNil() {
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return
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}
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value := prime.Elem()
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alike := reflect.New(value.Type()).Elem()
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copy(value, alike)
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clone.Set(alike)
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case reflect.Struct:
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for i := 0; i < prime.NumField(); i++ {
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if prime.Type().Field(i).PkgPath != "" {
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continue
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}
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copy(prime.Field(i), clone.Field(i))
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}
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case reflect.Slice:
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clone.Set(reflect.MakeSlice(prime.Type(), prime.Len(), prime.Cap()))
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for i := 0; i < prime.Len(); i++ {
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copy(prime.Index(i), clone.Index(i))
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}
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case reflect.Map:
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clone.Set(reflect.MakeMap(prime.Type()))
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for _, key := range prime.MapKeys() {
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value := prime.MapIndex(key)
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alike := reflect.New(value.Type()).Elem()
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copy(value, alike)
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clone.SetMapIndex(key, alike)
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}
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default:
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clone.Set(prime)
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}
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}
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