update book code

eBook/examples/chapter_12/xml.go

@@ -0,0 +1,49 @@
+// xml.go
+package main
+
+import (
+	"fmt"
+	"strings"
+	"encoding/xml"
+)
+
+var t, token	xml.Token
+var	err			error
+
+func main() {
+	input := "<Person><FirstName>Laura</FirstName><LastName>Lynn</LastName></Person>"
+	inputReader := strings.NewReader(input)
+	p := xml.NewDecoder(inputReader)
+	
+	for t, err = p.Token(); err == nil; t, err = p.Token() {
+		switch token := t.(type) {
+			case xml.StartElement:
+				name := token.Name.Local
+				fmt.Printf("Token name: %s\n", name)
+				for _, attr := range token.Attr {
+					attrName := attr.Name.Local
+					attrValue := attr.Value
+					fmt.Printf("An attribute is: %s %s\n", attrName, attrValue)
+					// ...
+				}
+			case xml.EndElement:
+				fmt.Println("End of token")
+			case xml.CharData:
+				content := string([]byte(token))
+				fmt.Printf("This is the content: %v\n", content )
+				// ...
+			default:
+				// ...
+		}
+	}
+}
+/* Output:
+Token name: Person
+Token name: FirstName
+This is the content: Laura
+End of token
+Token name: LastName
+This is the content: Lynn
+End of token
+End of token
+*/