mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 17:27:08 +08:00
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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"bytes"
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"context"
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"encoding/xml"
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"errors"
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"fmt"
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"strconv"
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"github.com/xiaoqidun/pdfgo"
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)
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// outlines 按先序批量转换目录，保留层级、展开状态和动作顺序
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// 入参: ctx 取消上下文
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// 返回: error 严格模式转换错误或取消错误
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func (p *pdfImporter) outlines(ctx context.Context) error {
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count := 0
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data, err := encodeOFDXMLContext(ctx, func(x *ofdXML) {
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x.root("Outlines", nil)
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depth := 0
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err := p.reader.WalkOutlines(ctx, func(level int, item pdfgo.OutlineItem) error {
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actions, err := p.outlineActions(ctx, item)
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if err != nil {
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if p.warning == nil || ctx.Err() != nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
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return err
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}
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p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline %q actions not transferred to OFD: %v", item.Title, err)})
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actions = nil
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}
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for depth > level {
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x.end("OutlineElem")
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depth--
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}
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attrs := ofdAttrs{{Name: xml.Name{Local: "Title"}, Value: item.Title}}
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attrs.add("Expanded", strconv.FormatBool(item.Expanded))
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x.start("OutlineElem", attrs)
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x.actions(actions)
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depth++
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count++
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return x.err
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})
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if err != nil {
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x.err = err
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return
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}
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for depth > 0 {
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x.end("OutlineElem")
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depth--
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}
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x.end("Outlines")
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})
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if err != nil {
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if ctx.Err() != nil {
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return ctx.Err()
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}
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if p.warning == nil || errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
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return err
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}
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p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outlines not transferred to OFD: %v", err)})
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return nil
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}
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if count > 0 {
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p.editor.outlines = bytes.TrimPrefix(data, []byte(xml.Header))
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}
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return nil
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}
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// outlineActions 转换目录目标及动作链，不为无目标节点补充跳转
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// 入参: ctx 取消上下文, item PDF目录节点
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// 返回: []Action OFD动作序列, error 动作或取消错误
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func (p *pdfImporter) outlineActions(ctx context.Context, item pdfgo.OutlineItem) ([]Action, error) {
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object, err := p.reader.Resolve(item.Action)
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if err != nil {
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return nil, err
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}
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dest, err := p.reader.Resolve(item.Destination)
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if err != nil {
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return nil, err
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}
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if dest != nil {
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if object != nil {
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return nil, fmt.Errorf("PDF outline has both destination and action")
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}
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object = pdfgo.Dictionary{"S": pdfgo.Name("GoTo"), "D": dest}
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}
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currentPage := -1
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var actions []Action
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err = p.reader.WalkActions(ctx, object, func(info pdfgo.ActionInfo) error {
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action, err := p.linkAction(pdfgo.Annotation{Dictionary: pdfgo.Dictionary{"A": info.Dictionary}}, p.warning == nil, ¤tPage)
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if err != nil {
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var unsupported *pdfgo.UnsupportedError
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if p.warning != nil && (errors.As(err, &unsupported) || errors.Is(err, pdfgo.ErrInvalidDestination) || errors.Is(err, pdfgo.ErrInvalidAction)) {
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p.warning(pdfgo.Diagnostic{Message: fmt.Sprintf("PDF outline action not transferred to OFD: %v", err)})
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currentPage = -1
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return nil
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}
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return err
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}
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if action != nil {
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actions = append(actions, *action)
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} else {
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currentPage = -1
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}
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return nil
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})
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return actions, err
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}
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