mirror of
https://github.com/xiaoqidun/ofdgo.git
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97 lines
2.9 KiB
Go
97 lines
2.9 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 "encoding/xml"
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// textObjectTokens 记录字形变换所属TextCode，供解码后转换为对象内索引
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type textObjectTokens struct {
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decoder *xml.Decoder
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start *xml.StartElement
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depth, code int
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transforms []int
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}
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// UnmarshalXML 解析字形变换，省略的字符数和字形数均取1
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// 入参: decoder XML解码器, start 变换起始节点
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// 返回: error 解码错误
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func (transform *CGTransform) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
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type plain CGTransform
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value := plain{CodeCount: 1, GlyphCount: 1}
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if err := decoder.DecodeElement(&value, &start); err != nil {
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return err
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}
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*transform = CGTransform(value)
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return nil
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}
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// Token 转发XML令牌并记录直接子节点顺序
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// 返回: xml.Token XML令牌, error 解码错误
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func (s *textObjectTokens) Token() (xml.Token, error) {
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if s.start != nil {
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start := *s.start
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s.start = nil
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return start, nil
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}
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token, err := s.decoder.Token()
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switch value := token.(type) {
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case xml.StartElement:
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if s.depth == 0 && value.Name.Local == "CGTransform" {
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s.transforms = append(s.transforms, s.code)
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}
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s.depth++
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case xml.EndElement:
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s.depth--
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if s.depth == 0 && value.Name.Local == "TextCode" {
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s.code++
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}
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}
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return token, err
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}
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// UnmarshalXML 将各TextCode前的局部字形位置统一为对象内索引
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// 入参: decoder XML解码器, start 对象起始节点
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// 返回: error 解码错误
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func (obj *TextObject) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
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type plain TextObject
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stream := &textObjectTokens{decoder: decoder, start: &start}
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var value plain
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if err := xml.NewTokenDecoder(stream).Decode(&value); err != nil {
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return err
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}
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offsets := make([]int, len(value.TextCode))
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for i := 1; i < len(offsets); i++ {
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offsets[i] = offsets[i-1] + len(textCodeRunes(value.TextCode[i-1].Value))
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}
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for i, code := range stream.transforms {
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if code < len(offsets) {
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value.CGTransform[i].CodePosition += offsets[code]
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}
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}
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*obj = TextObject(value)
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for _, attr := range start.Attr {
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if attr.Name.Local == "LineWidth" {
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obj.LineWidthSet = obj.LineWidth == 0
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}
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if attr.Name.Local == "MiterLimit" {
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obj.MiterLimitSet = obj.MiterLimit == 0
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}
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if attr.Name.Local == "DashPattern" {
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obj.dashPatternSet = obj.DashPattern == ""
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}
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}
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return nil
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}
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