From 5bc92dddd123d3102e7bb0c67f4a3211a43f3a46 Mon Sep 17 00:00:00 2001
From: xiaoqidun <xiaoqidun@gmail.com>
Date: Sat, 10 Oct 2026 21:12:27 +0800
Subject: [PATCH] =?UTF-8?q?feat(=E7=BC=96=E8=BE=91=E8=83=BD=E5=8A=9B):=20?=
 =?UTF-8?q?=E5=AE=8C=E5=96=84=E7=89=88=E6=9C=AC=E7=AE=A1=E7=90=86=E4=B8=8E?=
 =?UTF-8?q?=E7=BC=96=E8=BE=91=E9=9A=94=E7=A6=BB?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ofdgo_editor_documents.go |  38 +++-
 ofdgo_editor_versions.go  | 419 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 448 insertions(+), 9 deletions(-)
 create mode 100644 ofdgo_editor_versions.go

diff --git a/ofdgo_editor_documents.go b/ofdgo_editor_documents.go
index 0eb9f09..0052e16 100644
--- a/ofdgo_editor_documents.go
+++ b/ofdgo_editor_documents.go
@@ -27,10 +27,11 @@ import (
 	"strings"
 )
 
-// editorDocumentIdentity 标记编辑状态所属的文档，不持有页面或资源数据
+// editorDocumentIdentity 标记编辑状态所属的文档和版本，不持有页面或资源数据
 type editorDocumentIdentity struct {
 	root    string
 	id      string
+	version string
 	fresh   bool
 	single  bool
 	fromNew bool
@@ -309,7 +310,26 @@ func (e *Editor) editDocuments(edit func(*Reader, []byte, *editorXML) (int, erro
 	if _, err := reader.Doc(); err != nil {
 		return err
 	}
-	if e.source != nil && e.documentRoot() == reader.documentRoot && e.Info.DocID == reader.OFD.DocBody[index].DocInfo.DocID {
+	if err := e.adoptDocumentReader(reader); err != nil {
+		return err
+	}
+	e.recordTransaction(before)
+	return nil
+}
+
+// adoptDocumentReader 接入已加载的编辑入口，跨文档或版本时重建页面与资源状态
+// 入参: reader 不拥有输入文件的独立阅读器
+// 返回: error 编辑器初始化错误
+func (e *Editor) adoptDocumentReader(reader *Reader) error {
+	version, err := reader.DocumentVersionID()
+	if err != nil {
+		return err
+	}
+	current, err := e.DocumentVersionID()
+	if err != nil {
+		return err
+	}
+	if e.source != nil && e.documentRoot() == reader.documentRoot && current == version && e.Info.DocID == reader.OFD.DocBody[reader.documentIndex].DocInfo.DocID {
 		source := *e.source
 		source.reader = reader
 		e.source = &source
@@ -326,7 +346,6 @@ func (e *Editor) editDocuments(edit func(*Reader, []byte, *editorXML) (int, erro
 		next.validatedPaths = e.validatedPaths
 		*e = *next
 	}
-	e.recordTransaction(before)
 	return nil
 }
 
@@ -339,23 +358,24 @@ func (e *Editor) documentRoot() string {
 	return e.source.reader.documentRoot
 }
 
-// sameDocument 判断快照是否属于同一文档，区别删除后复用目录的新文档
+// sameDocument 判断快照是否属于同一文档版本，区别删除后复用目录的新文档
 // 入参: other 编辑快照
 // 返回: bool 是否为同一文档
 func (e *Editor) sameDocument(other *Editor) bool {
 	return e.documentIdentity().matches(other.documentIdentity())
 }
 
-// documentIdentity 获取当前文档的入口与原始标识，文档排序不改变身份
+// documentIdentity 获取当前文档的入口、原始标识及版本，文档排序不改变身份
 // 返回: editorDocumentIdentity 文档身份
 func (e *Editor) documentIdentity() editorDocumentIdentity {
 	if e.source == nil {
 		return editorDocumentIdentity{id: e.Info.DocID, fresh: true}
 	}
-	return editorDocumentIdentity{root: e.documentRoot(), id: e.source.info.DocID, single: e.DocumentCount() == 1, fromNew: e.source.fromNew}
+	version, _ := e.DocumentVersionID()
+	return editorDocumentIdentity{root: e.documentRoot(), id: e.source.info.DocID, version: version, single: e.DocumentCount() == 1, fromNew: e.source.fromNew}
 }
 
-// matches 判断两个编辑状态是否属于同一文档，允许新文档首次建立包结构
+// matches 判断两个编辑状态是否属于同一文档版本，允许新文档首次建立包结构
 // 入参: other 另一编辑状态的文档身份
 // 返回: bool 是否为同一文档
 func (identity editorDocumentIdentity) matches(other editorDocumentIdentity) bool {
@@ -367,7 +387,7 @@ func (identity editorDocumentIdentity) matches(other editorDocumentIdentity) boo
 		if !fresh.fresh {
 			fresh, packaged = other, identity
 		}
-		return packaged.single && (packaged.fromNew || fresh.id != "" && fresh.id == packaged.id)
+		return packaged.version == "" && packaged.single && (packaged.fromNew || fresh.id != "" && fresh.id == packaged.id)
 	}
-	return identity.root == other.root && identity.id == other.id
+	return identity.root == other.root && identity.id == other.id && identity.version == other.version
 }
diff --git a/ofdgo_editor_versions.go b/ofdgo_editor_versions.go
new file mode 100644
index 0000000..5417c51
--- /dev/null
+++ b/ofdgo_editor_versions.go
@@ -0,0 +1,419 @@
+// Copyright 2025-2026 肖其顿 (XIAO QI DUN)
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package ofdgo
+
+import (
+	"archive/zip"
+	"context"
+	"encoding/xml"
+	"fmt"
+	"maps"
+	"math"
+	"path"
+	"slices"
+	"strconv"
+	"strings"
+)
+
+// DocumentVersions 获取当前编辑文档的版本信息，包含尚未写出的修改
+// 返回: []DocumentVersionInfo 版本信息, error 读取错误
+func (e *Editor) DocumentVersions() ([]DocumentVersionInfo, error) {
+	if e.source == nil {
+		return nil, nil
+	}
+	reader, err := e.Reader()
+	if err != nil {
+		return nil, err
+	}
+	return reader.DocumentVersions()
+}
+
+// DocumentVersionID 获取当前编辑版本的标识，主入口返回空字符串
+// 返回: string 版本标识, error 读取错误
+func (e *Editor) DocumentVersionID() (string, error) {
+	if e.source == nil {
+		return "", nil
+	}
+	return e.source.reader.DocumentVersionID()
+}
+
+// SelectVersion 切换当前文档的编辑版本，保留各版本修改，不改变默认版本
+// 切换及此前编辑均可通过Undo撤销；空标识选择主入口
+// 入参: id 版本标识
+// 返回: error 切换错误
+func (e *Editor) SelectVersion(id string) error {
+	current, err := e.DocumentVersionID()
+	if err != nil || current == id {
+		return err
+	}
+	reader, err := e.Reader()
+	if err != nil {
+		return err
+	}
+	view, err := reader.DocumentVersion(id)
+	if err != nil {
+		return err
+	}
+	before := e.transactionSnapshot()
+	if err := e.adoptDocumentReader(view); err != nil {
+		return err
+	}
+	e.recordTransaction(before)
+	return nil
+}
+
+// AddVersion 以当前编辑内容创建版本并选中，设为默认版本，可通过Undo撤销
+// 初始共享文件，后续修改按需隔离；不自动写入创建日期，修改入口可能使已有签名失效
+// 入参: name 版本名称，可为空
+// 返回: string 新版本标识, error 创建错误
+func (e *Editor) AddVersion(name string) (string, error) {
+	var id string
+	err := e.editDocuments(func(reader *Reader, data []byte, root *editorXML) (int, error) {
+		versions, err := reader.documentVersionEntries()
+		if err != nil {
+			return 0, err
+		}
+		index := int32(0)
+		for _, version := range versions {
+			index = max(index, version.Index)
+		}
+		if index == math.MaxInt32 {
+			return 0, fmt.Errorf("document version index exhausted")
+		}
+		index++
+		ids := make(map[string]bool)
+		var collect func(*editorXML)
+		collect = func(node *editorXML) {
+			ids[node.attr("ID")] = true
+			for _, child := range node.children {
+				collect(child)
+			}
+		}
+		collect(root)
+		for serial := int64(index); ; serial++ {
+			id = "v" + strconv.FormatInt(serial, 10)
+			if !ids[id] {
+				break
+			}
+		}
+		entry, err := reader.DocumentRoot()
+		if err != nil {
+			return 0, err
+		}
+		files, err := reader.versionSnapshotFiles(context.Background())
+		if err != nil {
+			return 0, err
+		}
+		body := root.childAt("DocBody", reader.documentIndex)
+		location := packageAvailableName(reader, nil, path.Join(path.Dir(entry), "Versions", id+".xml"))
+		attrs := ofdAttrs{{Name: xml.Name{Local: "ID"}, Value: id}}
+		format := reader.Version()
+		if reader.versionInfo != nil && reader.versionInfo.Version != "" {
+			format = reader.versionInfo.Version
+		}
+		attrs.add("Version", format)
+		if name != "" {
+			attrs.add("Name", name)
+		}
+		descriptor, err := encodeOFDXML(func(x *ofdXML) {
+			x.root("DocVersion", attrs)
+			x.start("FileList", nil)
+			for serial, file := range slices.Sorted(maps.Keys(files)) {
+				x.start("File", ofdAttrs{{Name: xml.Name{Local: "ID"}, Value: "file" + strconv.Itoa(serial+1)}})
+				x.token(xml.CharData("/" + file))
+				x.end("File")
+			}
+			x.end("FileList")
+			x.text("DocRoot", "/"+entry)
+			x.end("DocVersion")
+		})
+		if err != nil {
+			return 0, err
+		}
+		descriptor, err = editorXMLGenerated(descriptor, body.name.Space)
+		if err != nil {
+			return 0, err
+		}
+		version, err := body.containerXML("Version", ofdAttrs{
+			{Name: xml.Name{Local: "ID"}, Value: id},
+			{Name: xml.Name{Local: "Index"}, Value: strconv.FormatInt(int64(index), 10)},
+			{Name: xml.Name{Local: "Current"}, Value: "true"},
+			{Name: xml.Name{Local: "BaseLoc"}, Value: "/" + location},
+		}, nil)
+		if err != nil {
+			return 0, err
+		}
+		data, err = editorVersionDefault(data, body, "")
+		if err != nil {
+			return 0, err
+		}
+		root, err = parseEditorXML(data)
+		if err != nil {
+			return 0, err
+		}
+		body = root.childAt("DocBody", reader.documentIndex)
+		var patch editorXMLPatch
+		if list := body.child("Versions"); list != nil {
+			patch = editorXMLPatch{list.close, list.close, version}
+		} else {
+			list, err := body.containerXML("Versions", nil, version)
+			if err != nil {
+				return 0, err
+			}
+			position := body.child("DocRoot").end
+			patch = editorXMLPatch{position, position, list}
+		}
+		reader.files[location] = descriptor
+		reader.files["OFD.xml"] = editorPatchXML(data, []editorXMLPatch{patch})
+		reader.selectedVersion = &id
+		return reader.documentIndex, nil
+	})
+	if err != nil {
+		return "", err
+	}
+	return id, nil
+}
+
+// SetDefaultVersion 设置下次打开使用的版本，不切换当前编辑入口，可通过Undo撤销
+// 空标识取消默认版本并使用主入口；修改OFD.xml可能使已有签名失效
+// 入参: id 版本标识
+// 返回: error 设置错误
+func (e *Editor) SetDefaultVersion(id string) error {
+	versions, err := e.DocumentVersions()
+	if err != nil {
+		return err
+	}
+	found, changed := id == "", false
+	for _, version := range versions {
+		found = found || version.ID == id
+		changed = changed || version.Current != (version.ID == id)
+	}
+	if !found {
+		return fmt.Errorf("document version not found: %s", id)
+	}
+	if !changed {
+		return nil
+	}
+	return e.editDocuments(func(reader *Reader, data []byte, root *editorXML) (int, error) {
+		current, err := reader.DocumentVersionID()
+		if err != nil {
+			return 0, err
+		}
+		updated, err := editorVersionDefault(data, root.childAt("DocBody", reader.documentIndex), id)
+		if err != nil {
+			return 0, err
+		}
+		reader.files["OFD.xml"], reader.selectedVersion = updated, &current
+		return reader.documentIndex, nil
+	})
+}
+
+// RenameVersion 修改版本名称，保留其他属性及扩展内容，可通过Undo撤销
+// 描述文件被共享时不覆盖原文件；修改入口可能使已有签名失效
+// 入参: id 版本标识, name 版本名称，空值清空名称
+// 返回: error 修改错误
+func (e *Editor) RenameVersion(id, name string) error {
+	versions, err := e.DocumentVersions()
+	if err != nil {
+		return err
+	}
+	index := slices.IndexFunc(versions, func(version DocumentVersionInfo) bool { return version.ID == id })
+	if index < 0 {
+		return fmt.Errorf("document version not found: %s", id)
+	}
+	if versions[index].Name == name {
+		return nil
+	}
+	return e.editDocuments(func(reader *Reader, data []byte, root *editorXML) (int, error) {
+		version := versions[index]
+		original, err := reader.readFile(version.Location)
+		if err != nil {
+			return 0, err
+		}
+		descriptor, err := parseEditorXML(original)
+		if err != nil {
+			return 0, err
+		}
+		updated, err := editorXMLAttribute(original, descriptor, "Name", name)
+		if err != nil {
+			return 0, err
+		}
+		extension := path.Ext(version.Location)
+		location := packageAvailableName(reader, nil, strings.TrimSuffix(version.Location, extension)+".edit"+extension)
+		body := root.childAt("DocBody", reader.documentIndex)
+		for _, node := range body.child("Versions").children {
+			if node.matchesOFD("Version") && node.attr("ID") == id {
+				fragment, err := editorXMLAttribute(data, node, "BaseLoc", "/"+location)
+				if err != nil {
+					return 0, err
+				}
+				reader.files["OFD.xml"] = editorPatchXML(data, []editorXMLPatch{{node.start, node.end, fragment}})
+				break
+			}
+		}
+		reader.files[location] = updated
+		if err := reader.retireVersionFiles(map[string]bool{version.Location: true}); err != nil {
+			return 0, err
+		}
+		return reader.documentIndex, nil
+	})
+}
+
+// DeleteVersion 删除版本及其独占文件，可通过Undo撤销，不删除文档主入口
+// 删除当前版本后转到剩余默认版本或主入口；修改入口可能使已有签名失效
+// 入参: id 版本标识，不能为空
+// 返回: error 删除错误
+func (e *Editor) DeleteVersion(id string) error {
+	return e.editDocuments(func(reader *Reader, data []byte, root *editorXML) (int, error) {
+		versions, err := reader.DocumentVersions()
+		if err != nil {
+			return 0, err
+		}
+		index := slices.IndexFunc(versions, func(version DocumentVersionInfo) bool { return version.ID == id })
+		if index < 0 {
+			return 0, fmt.Errorf("document version not found: %s", id)
+		}
+		current, err := reader.DocumentVersionID()
+		if err != nil {
+			return 0, err
+		}
+		list := root.childAt("DocBody", reader.documentIndex).child("Versions")
+		for _, node := range list.children {
+			if node.matchesOFD("Version") && node.attr("ID") == id {
+				if len(versions) == 1 {
+					node = list
+				}
+				reader.files["OFD.xml"] = editorPatchXML(data, []editorXMLPatch{{start: node.start, end: node.end}})
+				break
+			}
+		}
+		if current == id {
+			reader.selectedVersion = nil
+		}
+		removed := map[string]bool{versions[index].Location: true}
+		for _, file := range versions[index].Files {
+			removed[file.Location] = true
+		}
+		if err := reader.retireVersionFiles(removed); err != nil {
+			return 0, err
+		}
+		return reader.documentIndex, nil
+	})
+}
+
+// editorVersionDefault 修改版本入口的Current属性，不改变条目顺序或其他属性
+// 入参: data OFD入口原文, body 文档节点, id 默认版本，空值取消默认版本
+// 返回: []byte 更新后的入口, error 属性编码错误
+func editorVersionDefault(data []byte, body *editorXML, id string) ([]byte, error) {
+	list := body.child("Versions")
+	if list == nil {
+		return data, nil
+	}
+	var patches []editorXMLPatch
+	for _, node := range list.children {
+		if !node.matchesOFD("Version") {
+			continue
+		}
+		current := node.attr("ID") == id
+		if !current && !node.hasAttr("Current") {
+			continue
+		}
+		fragment, err := editorXMLAttribute(data, node, "Current", strconv.FormatBool(current))
+		if err != nil {
+			return nil, err
+		}
+		patches = append(patches, editorXMLPatch{node.start, node.end, fragment})
+	}
+	return editorPatchXML(data, patches), nil
+}
+
+// versionSnapshotFiles 汇总当前入口及其版本清单，补入适用的封面和签章文件
+// 入参: ctx 取消上下文
+// 返回: map[string]bool 快照文件, error 引用或读取错误
+func (r *Reader) versionSnapshotFiles(ctx context.Context) (map[string]bool, error) {
+	entry, err := r.DocumentRoot()
+	if err != nil {
+		return nil, err
+	}
+	graph, err := r.versionEditGraph(ctx, entry, nil)
+	if err != nil {
+		return nil, err
+	}
+	if r.versionInfo != nil {
+		for _, file := range r.versionInfo.Files {
+			graph.used[file.Location] = true
+		}
+	}
+	body := r.OFD.DocBody[r.documentIndex]
+	data, err := r.readFile("OFD.xml")
+	if err != nil {
+		return nil, err
+	}
+	root, err := parseEditorXML(data)
+	if err != nil {
+		return nil, err
+	}
+	if info := root.childAt("DocBody", r.documentIndex).child("DocInfo"); info != nil {
+		if cover := info.child("Cover"); cover != nil {
+			name, err := versionFileLocation("OFD.xml", editorImportText(data, cover))
+			if err != nil {
+				return nil, err
+			}
+			graph.used[name] = true
+		}
+	}
+	if signature := r.versionSignatures(body.Signatures); signature != "" {
+		files, err := r.versionEditGraph(ctx, cleanPackagePath(signature), nil)
+		if err != nil {
+			return nil, err
+		}
+		maps.Copy(graph.used, files.used)
+	}
+	for name := range graph.used {
+		if !r.fileNames[name] {
+			return nil, fmt.Errorf("version file not found: %s", name)
+		}
+	}
+	return graph.used, ctx.Err()
+}
+
+// retireVersionFiles 清理修改入口后不再被任何文档或版本引用的候选文件
+// 入参: candidates 待清理路径，OFD.xml始终保留
+// 返回: error 依赖读取错误
+func (r *Reader) retireVersionFiles(candidates map[string]bool) error {
+	view := *r
+	if err := view.initRoot(); err != nil {
+		return err
+	}
+	for index := range view.DocumentCount() {
+		files, err := view.documentFiles(context.Background(), index)
+		if err != nil {
+			return err
+		}
+		for name := range files {
+			delete(candidates, name)
+		}
+	}
+	delete(candidates, "OFD.xml")
+	for name := range candidates {
+		delete(r.files, name)
+	}
+	if r.Zip != nil {
+		r.Zip = &zip.Reader{Comment: r.Zip.Comment, File: slices.DeleteFunc(slices.Clone(r.Zip.File), func(file *zip.File) bool {
+			return candidates[cleanPackagePath(file.Name)]
+		})}
+	}
+	return nil
+}