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// 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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"maps"
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"strings"
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"unicode/utf8"
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)
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// editorGeneratedReferences 保存本次编码页面及其引用，不跨写出复用
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type editorGeneratedReferences struct {
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data []byte
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refs *editorResourceRefs
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staged *editorStagedPage
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}
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// matches 判断条目仍为本次编码结果，空条目与暂存占位不混用
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// 入参: data 当前条目数据
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// 返回: bool 是否可以复用本次引用
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func (r editorGeneratedReferences) matches(data []byte) bool {
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if r.staged != nil {
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return data == nil
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}
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return bytes.Equal(data, r.data)
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}
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// editorReferenceScan 按XML事件收集资源和字体用字，未知内容保持完整扫描
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type editorReferenceScan struct {
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refs *editorResourceRefs
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name string
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base string
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stack []string
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fonts []*editorFontUsage
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text strings.Builder
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resource bool
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capture bool
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safe bool
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seen bool
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}
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// accept 共用读取和自产页面的引用判断，不将对象自身标识视为引用
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// 入参: token 已解析或已编码的XML事件
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// 返回: bool 是否仍可完整判断引用
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func (s *editorReferenceScan) accept(token xml.Token) bool {
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if !s.safe {
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return false
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}
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switch token := token.(type) {
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case xml.StartElement:
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if token.Name.Space != "" && token.Name.Space != ofdNamespace {
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s.safe = false
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return false
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}
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if token.Name.Local == "CustomTags" || token.Name.Local == "Extensions" || token.Name.Local == "ExtendData" || token.Name.Local == "Data" {
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s.safe = false
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return false
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}
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if len(s.stack) == 0 {
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s.seen = true
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s.resource = token.Name.Local == "Res"
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if s.resource {
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for _, attr := range token.Attr {
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if attr.Name.Local == "BaseLoc" {
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s.base = attr.Value
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}
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}
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}
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}
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var usage *editorFontUsage
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if len(s.fonts) != 0 {
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usage = s.fonts[len(s.fonts)-1]
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if usage != nil && (s.stack[len(s.stack)-1] == "TextCode" || s.stack[len(s.stack)-1] == "Glyphs") {
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usage.unsafe = true
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}
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}
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for _, attr := range token.Attr {
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if attr.Name.Space == "xmlns" || attr.Name.Local == "xmlns" || attr.Name.Local == "xmlns:ofd" || attr.Name.Space == "http://www.w3.org/XML/1998/namespace" {
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continue
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}
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if attr.Name.Space != "" {
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s.safe = false
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return false
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}
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if attr.Name.Local != "ID" {
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s.refs.reference(s.name, s.base, attr.Name.Local, attr.Value, s.resource)
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}
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if attr.Name.Local == "Font" {
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usage = s.refs.fontUsage(attr.Value)
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if token.Name.Local != "TextObject" && token.Name.Local != "Text" {
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usage.unsafe = true
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}
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} else if attr.Name.Local == "Substitution" {
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s.refs.fontUsage(attr.Value).unsafe = true
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}
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}
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s.stack = append(s.stack, token.Name.Local)
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s.fonts = append(s.fonts, usage)
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s.text.Reset()
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s.capture = editorResourceReferenceKind(token.Name.Local, s.resource) != editorReferenceNone || usage != nil && (token.Name.Local == "TextCode" || token.Name.Local == "Glyphs")
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case xml.CharData:
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if s.capture {
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s.text.Write(token)
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}
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case xml.EndElement:
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if len(s.stack) == 0 || s.stack[len(s.stack)-1] != token.Name.Local {
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s.safe = false
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return false
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}
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s.refs.reference(s.name, s.base, token.Name.Local, s.text.String(), s.resource)
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if (token.Name.Local == "Substitution" || token.Name.Local == "Font") && strings.TrimSpace(s.text.String()) != "" {
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s.refs.fontUsage(s.text.String()).unsafe = true
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}
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if usage := s.fonts[len(s.fonts)-1]; usage != nil {
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usage.text(token.Name.Local, s.text.String())
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}
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s.stack = s.stack[:len(s.stack)-1]
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s.fonts = s.fonts[:len(s.fonts)-1]
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s.text.Reset()
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s.capture = false
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if len(s.stack) != 0 {
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key, usage := s.stack[len(s.stack)-1], s.fonts[len(s.fonts)-1]
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s.capture = editorResourceReferenceKind(key, s.resource) != editorReferenceNone || usage != nil && (key == "TextCode" || key == "Glyphs")
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}
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case xml.Directive:
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s.safe = false
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}
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return s.safe
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}
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// merge 合并本次编码已确认的引用，不共享字体用字的可变集合
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// 入参: other 独立页面引用
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func (r *editorResourceRefs) merge(other *editorResourceRefs) {
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maps.Copy(r.ids, other.ids)
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maps.Copy(r.files, other.files)
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for id, usage := range other.fonts {
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r.fontUsage(id).merge(usage, false)
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}
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}
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// referenceToken 记录自产OFD事件，编码会替换的字符使本页回到完整扫描
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// 入参: token 已写入的XML事件
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func (x *ofdXML) referenceToken(token xml.Token) {
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if x.references == nil || x.err != nil {
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return
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}
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s := x.references
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switch value := token.(type) {
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case xml.StartElement:
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value.Name = xml.Name{Space: ofdNamespace, Local: strings.TrimPrefix(value.Name.Local, "ofd:")}
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for _, attr := range value.Attr {
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if editorResourceReferenceKind(attr.Name.Local, s.resource) != editorReferenceNone && !editorReferenceTextSafe(attr.Value) {
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s.safe = false
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}
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}
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token = value
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case xml.EndElement:
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value.Name = xml.Name{Space: ofdNamespace, Local: strings.TrimPrefix(value.Name.Local, "ofd:")}
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token = value
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case xml.CharData:
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if s.capture && !editorReferenceTextSafe(string(value)) {
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s.safe = false
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}
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}
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if !s.accept(token) {
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x.references = nil
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}
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}
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// referenceElement 收集已知叶节点的引用，其他结构仍完整扫描
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// 入参: name 元素名称, value 已编码的子树内容
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func (x *ofdXML) referenceElement(name string, value any) {
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if x.references == nil || x.err != nil {
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return
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}
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var attrs ofdAttrs
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switch value := value.(type) {
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case ShdColor:
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attrs.add("ColorSpace", value.ColorSpace)
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case *ShdColor:
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if value == nil {
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return
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}
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attrs.add("ColorSpace", value.ColorSpace)
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case *Sound:
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if value == nil {
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return
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}
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attrs.add("ResourceID", value.ResourceID)
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case *Movie:
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if value == nil {
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return
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}
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attrs.add("ResourceID", value.ResourceID)
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case *GotoBookmark, *URI, *GotoA:
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default:
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x.references.safe = false
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x.references = nil
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return
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}
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x.referenceToken(xml.StartElement{Name: xml.Name{Local: "ofd:" + name}, Attr: attrs})
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x.referenceToken(xml.EndElement{Name: xml.Name{Local: "ofd:" + name}})
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}
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// editorReferenceTextSafe 判断XML编码是否保持引用文本的Unicode值
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// 入参: value 原始引用或字体用字
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// 返回: bool 是否无需字符替换
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func editorReferenceTextSafe(value string) bool {
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if !utf8.ValidString(value) {
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return false
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}
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for _, char := range value {
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if char != '\t' && char != '\n' && char != '\r' && (char < 0x20 || char == 0xfffe || char == 0xffff) {
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return false
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}
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}
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return true
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}
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