mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
124 lines
3.5 KiB
Go
124 lines
3.5 KiB
Go
// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
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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 ofdgo
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import (
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"reflect"
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"sync"
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)
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// editorClonePlans 仅共享类型的可变字段索引，不持有文档对象或资源
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var editorClonePlans sync.Map
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// cloneEditorData 深复制编辑快照，未导出的排版及原文来源保持不可变共享
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// 入参: value 原值
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// 返回: T 独立副本
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func cloneEditorData[T any](value T) T {
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source := reflect.ValueOf(value)
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if !source.IsValid() {
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return value
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}
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return cloneEditorValue(source).Interface().(T)
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}
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// cloneEditorValue 复制公开指针、切片及数组，纯值数据不创建额外结构
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// 入参: value 原值
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// 返回: reflect.Value 独立副本
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func cloneEditorValue(value reflect.Value) reflect.Value {
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if !value.IsValid() || !editorCloneMutable(value.Type()) {
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return value
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}
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switch value.Kind() {
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case reflect.Pointer:
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if value.IsNil() {
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return value
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}
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result := reflect.New(value.Type().Elem())
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cloneEditorInto(result.Elem(), value.Elem())
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return result
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case reflect.Slice:
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if value.IsNil() {
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return value
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}
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result := reflect.MakeSlice(value.Type(), value.Len(), value.Len())
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if !editorCloneMutable(value.Type().Elem()) {
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reflect.Copy(result, value)
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} else {
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for i := range value.Len() {
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cloneEditorInto(result.Index(i), value.Index(i))
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}
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}
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return result
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default:
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result := reflect.New(value.Type()).Elem()
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cloneEditorInto(result, value)
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return result
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}
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}
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// cloneEditorInto 直接填充目标结构，避免指针及切片成员的二次结构分配
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// 入参: target 可写目标, source 原值
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func cloneEditorInto(target, source reflect.Value) {
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switch source.Kind() {
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case reflect.Struct:
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target.Set(source)
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for _, i := range editorCloneFields(source.Type()) {
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cloneEditorInto(target.Field(i), source.Field(i))
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}
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case reflect.Array:
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target.Set(source)
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if editorCloneMutable(source.Type().Elem()) {
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for i := range source.Len() {
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cloneEditorInto(target.Index(i), source.Index(i))
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}
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}
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default:
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target.Set(cloneEditorValue(source))
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}
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}
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// editorCloneMutable 判断类型是否含有需要隔离的公开可变成员
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// 入参: kind 数据类型
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// 返回: bool 是否需要独立复制
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func editorCloneMutable(kind reflect.Type) bool {
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switch kind.Kind() {
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case reflect.Pointer, reflect.Slice:
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return true
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case reflect.Array:
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return editorCloneMutable(kind.Elem())
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case reflect.Struct:
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return len(editorCloneFields(kind)) != 0
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}
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return false
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}
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// editorCloneFields 按类型复用公开可变字段，索引发布后保持只读
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// 入参: kind 结构类型
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// 返回: []int 可变字段索引
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func editorCloneFields(kind reflect.Type) []int {
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if cached, ok := editorClonePlans.Load(kind); ok {
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return cached.([]int)
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}
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var fields []int
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for i := range kind.NumField() {
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field := kind.Field(i)
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if field.IsExported() && editorCloneMutable(field.Type) {
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fields = append(fields, i)
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}
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}
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actual, _ := editorClonePlans.LoadOrStore(kind, fields)
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return actual.([]int)
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}
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