feat(归并文件): 归并文件下沉通用能力

ofdgo_text.go

@@ -16,6 +16,7 @@ package ofdgo
 
 import (
 	"context"
+	"encoding/xml"
 	"math"
 	"strconv"
 	"strings"
@@ -340,3 +341,105 @@ func textCodeRunesContext(ctx context.Context, value string) ([]rune, error) {
 	}
 	return runes[:written], nil
 }
+
+// UnmarshalXML 解析字形变换，省略的字符数和字形数均取1
+// 入参: decoder XML解码器, start 变换起始节点
+// 返回: error 解码错误
+func (transform *CGTransform) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
+	*transform = CGTransform{CodeCount: 1, GlyphCount: 1}
+	for _, attr := range start.Attr {
+		if attr.Name.Space != "" {
+			continue
+		}
+		var target *int
+		switch attr.Name.Local {
+		case "CodePosition":
+			target = &transform.CodePosition
+		case "CodeCount":
+			target = &transform.CodeCount
+		case "GlyphCount":
+			target = &transform.GlyphCount
+		}
+		if target != nil {
+			value, err := strconv.Atoi(strings.TrimSpace(attr.Value))
+			if err != nil {
+				return err
+			}
+			*target = value
+		}
+	}
+	return decodeOFDChildren(decoder, start, func(d *xml.Decoder, node xml.StartElement) error {
+		if node.Name.Local == "Glyphs" {
+			return d.DecodeElement(&transform.Glyphs, &node)
+		}
+		return d.Skip()
+	})
+}
+
+// UnmarshalXML 解析文字定位及原文，不使用带外部命名空间的定位属性
+// 入参: decoder XML解码器, start 文字节点
+// 返回: error 解码错误
+func (code *TextCode) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
+	type plain TextCode
+	var value plain
+	start = ofdXMLStart(start)
+	if err := decoder.DecodeElement(&value, &start); err != nil {
+		return err
+	}
+	*code = TextCode(value)
+	return nil
+}
+
+// UnmarshalXML 解析标准文字节点，将各TextCode前的局部字形位置统一为对象内索引
+// 入参: decoder XML解码器, start 对象起始节点
+// 返回: error 解码错误
+func (obj *TextObject) UnmarshalXML(decoder *xml.Decoder, start xml.StartElement) error {
+	type plain TextObject
+	var value plain
+	if err := decodeGraphicAttributes(start, &value); err != nil {
+		return err
+	}
+	offset, pending := 0, 0
+	if err := decodeOFDChildren(decoder, start, func(d *xml.Decoder, node xml.StartElement) error {
+		switch node.Name.Local {
+		case "FillColor":
+			return d.DecodeElement(&value.FillColor, &node)
+		case "StrokeColor":
+			return d.DecodeElement(&value.StrokeColor, &node)
+		case "Clips":
+			return d.DecodeElement(&value.Clips, &node)
+		case "Actions":
+			return decodeOFDActions(d, node, &value.Actions)
+		case "CGTransform":
+			return d.DecodeElement(&value.CGTransform, &node)
+		case "TextCode":
+			var code TextCode
+			if err := d.DecodeElement(&code, &node); err != nil {
+				return err
+			}
+			for i := pending; i < len(value.CGTransform); i++ {
+				value.CGTransform[i].CodePosition += offset
+			}
+			pending = len(value.CGTransform)
+			offset += len(textCodeRunes(code.Value))
+			value.TextCode = append(value.TextCode, code)
+			return nil
+		}
+		return d.Skip()
+	}); err != nil {
+		return err
+	}
+	*obj = TextObject(value)
+	for _, attr := range ofdXMLStart(start).Attr {
+		if attr.Name.Local == "LineWidth" {
+			obj.LineWidthSet = obj.LineWidth == 0
+		}
+		if attr.Name.Local == "MiterLimit" {
+			obj.MiterLimitSet = obj.MiterLimit == 0
+		}
+		if attr.Name.Local == "DashPattern" {
+			obj.dashPatternSet = obj.DashPattern == ""
+		}
+	}
+	return nil
+}