Lots of stuff

xmlparsing/optionalbool.go

@@ -0,0 +1,57 @@
+package xmlparsing
+
+import (
+	"encoding/xml"
+	"strings"
+)
+
+type OptionalBool int
+
+const (
+	Unspecified OptionalBool = iota
+	True
+	False
+)
+
+func (b OptionalBool) IsTrue() bool {
+	return b == True
+}
+
+func (b OptionalBool) IsFalse() bool {
+	return b == False || b == Unspecified
+}
+
+func (b *OptionalBool) UnmarshalXML(d *xml.Decoder, start xml.StartElement) error {
+	var attr struct {
+		Value string `xml:"value,attr"`
+	}
+	if err := d.DecodeElement(&attr, &start); err != nil {
+		return err
+	}
+
+	switch strings.ToLower(attr.Value) {
+	case "true":
+		*b = True
+	case "false":
+		*b = False
+	default:
+		*b = Unspecified
+	}
+	return nil
+}
+
+func (b OptionalBool) MarshalXML(e *xml.Encoder, start xml.StartElement) error {
+	if b == Unspecified {
+		return nil
+	}
+
+	value := "false"
+	if b == True {
+		value = "true"
+	}
+
+	type alias struct {
+		Value string `xml:"value,attr"`
+	}
+	return e.EncodeElement(alias{Value: value}, start)
+}