mirror of
https://github.com/xiaoqidun/ofdgo.git
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123 lines
3.7 KiB
Go
123 lines
3.7 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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"context"
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"strings"
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)
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// structureVisitor 按引用收集图元及复合图元成员的原文和页面范围
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type structureVisitor struct {
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ctx context.Context
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renderer *Renderer
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targets map[string]*StructureTarget
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stack []*StructureTarget
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text map[*StructureTarget]*strings.Builder
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boundsOnly bool
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}
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// BeginObject 记录当前图元的标引目标，使复合图元引用覆盖其成员
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// 入参: object 页面图元
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// 返回: bool 是否需要配对结束通知
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func (v *structureVisitor) BeginObject(object *GraphicObject) bool {
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target := v.targets[editorResourceID(editorObjectID(*object))]
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if target != nil {
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target.Error = ""
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}
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v.stack = append(v.stack, target)
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return true
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}
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// EndObject 结束当前图元的标引收集
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func (v *structureVisitor) EndObject() {
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v.stack = v.stack[:len(v.stack)-1]
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}
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// BeginAnnotation 不为注解容器建立额外标引层级
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// 入参: id 注解标识
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// 返回: bool 始终为false
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func (v *structureVisitor) BeginAnnotation(id string) bool { return false }
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// SkipObjects 不使用渲染对象序号，隐藏成员不占用额外状态
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// 入参: count 跳过的图元数
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func (v *structureVisitor) SkipObjects(count int) {}
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// IncludeHidden 读取原文时保留隐藏语义，仅定位时跳过隐藏复合图元及注解
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// 返回: bool 是否需要隐藏内容
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func (v *structureVisitor) IncludeHidden() bool { return !v.boundsOnly }
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// SkipClips 保留裁剪语义，以可见范围定位图元
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// 返回: bool 始终为false
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func (v *structureVisitor) SkipClips() bool { return false }
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// DrawObject 按继承变换和裁剪度量被引用的图元，按需汇总原文，不解码图片像素
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// 入参: object 页面图元, state 继承状态
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// 返回: error 度量或取消错误
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func (v *structureVisitor) DrawObject(object *GraphicObject, state RenderState) error {
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if err := v.ctx.Err(); err != nil {
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return err
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}
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wanted := false
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for _, target := range v.stack {
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wanted = wanted || target != nil
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}
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if !wanted {
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return nil
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}
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var box Box
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if !state.Hidden {
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result, err := v.renderer.MeasureObject(*object, MeasureOptions{Defaults: state.Defaults, Parent: state.Parent, BoundaryInCTM: state.BoundaryInCTM, Clip: state.Clip})
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if err != nil {
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return err
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}
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box = result.Bounds
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}
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var text string
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if !v.boundsOnly && object.Type == "TextObject" {
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text = object.TextObject.Text()
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}
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for _, target := range v.stack {
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if target == nil {
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continue
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}
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target.Bounds = unionTextBox(target.Bounds, box)
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if text != "" {
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if target.Text == "" {
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target.Text = text
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continue
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}
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if v.text == nil {
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v.text = make(map[*StructureTarget]*strings.Builder)
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}
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builder := v.text[target]
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if builder == nil {
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builder = new(strings.Builder)
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builder.WriteString(target.Text)
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v.text[target] = builder
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}
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builder.WriteByte('\n')
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builder.WriteString(text)
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target.Text = builder.String()
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}
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}
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return nil
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}
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// DrawStamp 不将签章外观混入正文标引
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// 入参: stamp 签章外观
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// 返回: error 取消错误
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func (v *structureVisitor) DrawStamp(stamp Stamp) error { return v.ctx.Err() }
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