mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 16:59:27 +08:00
250 lines
8.2 KiB
Go
250 lines
8.2 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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"bytes"
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"encoding/xml"
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"fmt"
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"io"
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"reflect"
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)
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// sourceInfoXML 更新文档描述字段，保留未识别内容
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// 返回: []byte 根索引XML, error 错误信息
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func (e *Editor) sourceInfoXML() ([]byte, error) {
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data, err := e.source.reader.readFile("OFD.xml")
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if err != nil {
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return nil, err
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}
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return editorUpdateInfoXML(data, e.source.fallbackDocID, e.source.reader.documentIndex, e.source.info, e.Info)
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}
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// editorUpdateInfoXML 更新指定文档的描述和自定义字段，保留未修改内容
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// 入参: data 根索引XML, docID 缺少描述时使用的标识, index 文档索引, before 原信息, after 新信息
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// 返回: []byte 修改后的XML, error 解析错误
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func editorUpdateInfoXML(data []byte, docID string, index int, before, after DocInfo) ([]byte, error) {
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data, info, err := editorDocInfoXML(data, docID, index)
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if err != nil {
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return nil, err
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}
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var values [][2]string
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for _, field := range [][3]string{
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{"DocID", before.DocID, after.DocID}, {"Title", before.Title, after.Title}, {"Author", before.Author, after.Author},
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{"Subject", before.Subject, after.Subject}, {"Abstract", before.Abstract, after.Abstract},
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{"CreationDate", before.CreationDate, after.CreationDate}, {"ModDate", before.ModDate, after.ModDate},
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{"Creator", before.Creator, after.Creator}, {"CreatorVersion", before.CreatorVersion, after.CreatorVersion},
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} {
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if field[1] != field[2] {
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values = append(values, [2]string{field[0], field[2]})
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}
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}
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data = editorXMLSetText(data, info, values)
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if !reflect.DeepEqual(before.CustomDatas, after.CustomDatas) {
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root, err := parseEditorXML(data)
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if err != nil {
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return nil, err
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}
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return editorCustomDatas(data, root.childAt("DocBody", index).child("DocInfo"), after.CustomDatas)
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}
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return data, nil
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}
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// editorCreatorXML 更新指定文档的制作软件，移除原软件版本，保留其余根索引内容
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// 入参: data 当前根索引XML, docID 缺少文档描述时使用的标识, index 文档索引
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// 返回: []byte 修改后的XML, error 解析错误
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func editorCreatorXML(data []byte, docID string, index int) ([]byte, error) {
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data, info, err := editorDocInfoXML(data, docID, index)
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if err != nil {
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return nil, err
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}
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return editorXMLSetText(data, info, [][2]string{{"Creator", ofdCreator}, {"CreatorVersion", ""}}), nil
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}
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// editorDocInfoXML 获取文档描述，修改缺少描述的源文件时补建标准容器及标识
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// 入参: data 根索引XML, docID 缺少文档描述时使用的标识, index 文档索引
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// 返回: []byte 根索引XML, *editorXML 描述节点, error 解析错误
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func editorDocInfoXML(data []byte, docID string, index int) ([]byte, *editorXML, error) {
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root, err := parseEditorXML(data)
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if err != nil {
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return nil, nil, err
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}
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body := root.childAt("DocBody", index)
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if body == nil {
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return nil, nil, fmt.Errorf("document has no DocBody")
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}
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if info := body.child("DocInfo"); info != nil {
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return data, info, nil
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}
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info, err := editorXMLContainer("DocInfo", nil, editorXMLText("DocID", docID))
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if err != nil {
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return nil, nil, err
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}
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data = editorPatchXML(data, []editorXMLPatch{{body.open, body.open, info}})
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root, err = parseEditorXML(data)
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if err != nil {
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return nil, nil, err
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}
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return data, root.childAt("DocBody", index).child("DocInfo"), nil
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}
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// editorCustomDatas 更新自定义字段，保留原字段及容器的扩展内容
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// 入参: data 原XML, info 文档信息节点, values 新字段
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// 返回: []byte 修改后的XML, error 编码错误
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func editorCustomDatas(data []byte, info *editorXML, values *CustomDatas) ([]byte, error) {
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container := info.child("CustomDatas")
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var items []CustomData
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if values != nil {
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items = values.CustomData
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}
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byName := make(map[string][]*editorXML)
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var nodes []*editorXML
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if container != nil {
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for _, node := range container.children {
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if node.name.Local == "CustomData" && (node.name.Space == ofdNamespace || node.name.Space == container.name.Space) {
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nodes = append(nodes, node)
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byName[node.attr("Name")] = append(byName[node.attr("Name")], node)
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}
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}
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}
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var encoded [][]byte
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used := make(map[*editorXML]bool)
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for _, item := range items {
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if item.sourceIndex > 0 && item.sourceIndex <= len(nodes) {
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used[nodes[item.sourceIndex-1]] = true
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}
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}
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for _, item := range items {
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var node *editorXML
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if item.sourceIndex > 0 && item.sourceIndex <= len(nodes) {
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node = nodes[item.sourceIndex-1]
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} else {
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for _, candidate := range byName[item.Name] {
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if !used[candidate] {
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node = candidate
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used[node] = true
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break
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}
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}
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}
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if node == nil {
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entry, err := xml.Marshal(struct {
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XMLName xml.Name
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CustomData
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}{xml.Name{Space: ofdNamespace, Local: "CustomData"}, item})
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if err != nil {
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return nil, err
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}
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encoded = append(encoded, entry)
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continue
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}
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var original CustomData
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if err := xml.Unmarshal(data[node.start:node.end], &original); err != nil {
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return nil, err
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}
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if original.Name != item.Name {
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entry, err := editorXMLAttribute(data, node, "Name", item.Name)
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if err != nil {
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return nil, err
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}
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renamed, err := parseEditorXML(entry)
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if err != nil {
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return nil, err
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}
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updated, err := editorCustomDataValue(entry, renamed, original.Value, item.Value)
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if err != nil {
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return nil, err
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}
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encoded = append(encoded, updated)
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continue
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}
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entry, err := editorCustomDataValue(data, node, original.Value, item.Value)
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if err != nil {
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return nil, err
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}
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encoded = append(encoded, entry)
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}
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if container == nil {
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if len(encoded) == 0 {
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return data, nil
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}
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content := []byte("<ofd:CustomDatas xmlns:ofd=\"" + ofdNamespace + "\">")
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content = append(content, bytes.Join(encoded, nil)...)
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content = append(content, []byte("</ofd:CustomDatas>")...)
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if info.open == info.end {
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return editorPatchXML(data, []editorXMLPatch{editorXMLContent(data, info, content)}), nil
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}
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return editorPatchXML(data, []editorXMLPatch{{info.close, info.close, content}}), nil
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}
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var patches []editorXMLPatch
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for i, node := range nodes {
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var entry []byte
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if i < len(encoded) {
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entry = encoded[i]
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}
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patches = append(patches, editorXMLPatch{node.start, node.end, entry})
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}
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if len(encoded) > len(nodes) {
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added := bytes.Join(encoded[len(nodes):], nil)
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if container.open == container.end {
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patches = append(patches, editorXMLContent(data, container, added))
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} else {
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patches = append(patches, editorXMLPatch{container.close, container.close, added})
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}
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}
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return editorPatchXML(data, patches), nil
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}
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// editorCustomDataValue 修改字段文本，保留扩展子节点和注释
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// 入参: data 原XML, node 字段节点, before 原值, after 新值
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// 返回: []byte 字段XML, error 编码错误
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func editorCustomDataValue(data []byte, node *editorXML, before, after string) ([]byte, error) {
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if before == after {
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return data[node.start:node.end], nil
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}
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var content bytes.Buffer
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if err := xml.EscapeText(&content, []byte(after)); err != nil {
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return nil, err
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}
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if node.open < node.close {
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inner := data[node.open:node.close]
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decoder := xml.NewDecoder(bytes.NewReader(inner))
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depth := 0
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for {
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start := decoder.InputOffset()
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token, err := decoder.RawToken()
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if err == io.EOF {
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break
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}
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if err != nil {
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return nil, err
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}
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_, text := token.(xml.CharData)
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if !text || depth != 0 {
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content.Write(inner[start:decoder.InputOffset()])
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}
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switch token.(type) {
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case xml.StartElement:
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depth++
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case xml.EndElement:
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depth--
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}
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}
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}
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patch := editorXMLContent(data, node, content.Bytes())
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entry := append(bytes.Clone(data[node.start:patch.start]), patch.data...)
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return append(entry, data[patch.end:node.end]...), nil
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}
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