mirror of
https://github.com/xiaoqidun/ofdgo.git
synced 2026-10-29 08:46:55 +08:00
110 lines
3.0 KiB
Go
110 lines
3.0 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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"encoding/xml"
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"fmt"
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)
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// MarshalXML 按标准属性写入目标，书签和动作采用相同格式
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// 入参: encoder XML编码器, start 起始节点
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// 返回: error 参数或编码错误
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func (dest Dest) MarshalXML(encoder *xml.Encoder, start xml.StartElement) error {
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attrs, err := dest.attributes()
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if err != nil {
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return err
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}
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start.Attr = attrs
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if err := encoder.EncodeToken(start); err != nil {
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return err
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}
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return encoder.EncodeToken(start.End())
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}
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// effective 应用省略属性的默认值，不改变原始声明
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// 返回: Dest 生效的目标参数
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func (dest Dest) effective() Dest {
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if dest.OmitLeft {
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dest.Left = 0
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}
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if dest.OmitTop {
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dest.Top = 0
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}
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if dest.OmitZoom {
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dest.Zoom = 0
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}
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return dest
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}
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// attributes 校验并生成目标属性，缩放为0表示沿用当前比例
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// 返回: ofdAttrs 标准属性, error 模式或参数错误
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func (dest Dest) attributes() (ofdAttrs, error) {
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dest = dest.effective()
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attrs := ofdAttrs{{Name: xml.Name{Local: "Type"}, Value: dest.Type}, {Name: xml.Name{Local: "PageID"}, Value: dest.PageID}}
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if dest.PageID == "" {
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return nil, fmt.Errorf("missing destination page")
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}
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add := func(name string, value float64, omit bool) error {
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if !finite(value) {
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return fmt.Errorf("invalid destination %s", name)
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}
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if !omit {
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attrs.add(name, ofdNumber(value))
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}
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return nil
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}
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switch dest.Type {
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case "XYZ":
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if dest.Zoom != 0 && (dest.Zoom < 0.1 || dest.Zoom > 64) {
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return nil, fmt.Errorf("destination zoom must be zero or between 0.1 and 64")
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}
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if err := add("Zoom", dest.Zoom, dest.OmitZoom); err != nil {
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return nil, err
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}
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fallthrough
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case "FitR":
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if err := add("Left", dest.Left, dest.OmitLeft); err != nil {
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return nil, err
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}
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if err := add("Top", dest.Top, dest.OmitTop); err != nil {
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return nil, err
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}
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if dest.Type == "FitR" {
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if dest.Right <= dest.Left || dest.Bottom <= dest.Top {
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return nil, fmt.Errorf("empty destination rectangle")
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}
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if err := add("Right", dest.Right, false); err != nil {
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return nil, err
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}
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if err := add("Bottom", dest.Bottom, false); err != nil {
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return nil, err
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}
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}
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case "FitH":
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if err := add("Top", dest.Top, dest.OmitTop); err != nil {
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return nil, err
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}
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case "FitV":
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if err := add("Left", dest.Left, dest.OmitLeft); err != nil {
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return nil, err
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}
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case "Fit":
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default:
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return nil, fmt.Errorf("invalid destination type %q", dest.Type)
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}
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return attrs, nil
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}
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