feat(渲染编辑): 完善渲染压缩及文档版本编辑

ofdgo_editor_resource_graph.go

@@ -0,0 +1,103 @@
+// 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 (
+	"bytes"
+	"context"
+	"encoding/xml"
+	"io"
+)
+
+// editorResourceElement 返回标准资源集合中的声明元素名称
+// 入参: group 资源集合名称
+// 返回: string 声明元素名称，未知集合返回空值
+func editorResourceElement(group string) string {
+	switch group {
+	case "Fonts":
+		return "Font"
+	case "MultiMedias":
+		return "MultiMedia"
+	case "ColorSpaces":
+		return "ColorSpace"
+	case "DrawParams":
+		return "DrawParam"
+	case "CompositeGraphicUnits":
+		return "CompositeGraphicUnit"
+	}
+	return ""
+}
+
+// editorResourceDefinitions 单次流式读取资源声明依赖，保留历史索引和非图像媒体
+// 入参: ctx 取消上下文, data 资源索引内容, name 文件路径, source 扫描结果, preserved 是否保留全部声明
+// 返回: *editorResourceRefs 含声明依赖的引用，无法安全分析时为空, error 解析或取消错误
+func editorResourceDefinitions(ctx context.Context, data []byte, name string, source *editorResourceRefs, preserved bool) (*editorResourceRefs, error) {
+	result := *source
+	result.ids, result.fonts = make(map[string]bool), nil
+	result.definitions = make(map[string]*editorResourceRefs)
+	outer := &editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool), fonts: make(map[string]*editorFontUsage)}
+	scan := editorReferenceScan{refs: outer, name: name, safe: true}
+	decoder := xml.NewDecoder(imageInput{ReadCloser: io.NopCloser(bytes.NewReader(data)), context: ctx})
+	for {
+		if err := ctx.Err(); err != nil {
+			return nil, err
+		}
+		token, err := decoder.Token()
+		if err == io.EOF {
+			if !scan.seen || len(scan.stack) != 0 {
+				return nil, nil
+			}
+			return &result, ctx.Err()
+		}
+		if err != nil {
+			return nil, err
+		}
+		depth := len(scan.stack)
+		if node, ok := token.(xml.StartElement); ok {
+			if depth == 0 && (scan.seen || node.Name.Local != "Res") || depth == 1 && editorResourceElement(node.Name.Local) == "" {
+				return nil, nil
+			}
+			if depth == 2 {
+				kind := editorResourceElement(scan.stack[1])
+				var id, mediaType string
+				for _, attr := range node.Attr {
+					if attr.Name.Space == "" {
+						switch attr.Name.Local {
+						case "ID":
+							id = editorResourceID(attr.Value)
+						case "Type":
+							mediaType = attr.Value
+						}
+					}
+				}
+				if node.Name.Local != kind || id == "" || result.definitions[id] != nil {
+					return nil, nil
+				}
+				refs := &editorResourceRefs{ids: make(map[string]bool), files: make(map[string]bool), fonts: make(map[string]*editorFontUsage)}
+				result.definitions[id] = refs
+				scan.refs = refs
+				if preserved || kind == "MultiMedia" && mediaType != "Image" {
+					result.ids[id] = true
+				}
+			}
+		}
+		if !scan.accept(token) {
+			return nil, ctx.Err()
+		}
+		if _, end := token.(xml.EndElement); end && depth == 3 {
+			scan.refs = outer
+		}
+	}
+}