Just another update

Task/XML-XPath/Go/xml-xpath-1.go

@@ -0,0 +1,80 @@
+package main
+
+import (
+	"encoding/xml"
+	"fmt"
+	"log"
+	"os"
+)
+
+type Inventory struct {
+	XMLName  xml.Name `xml:"inventory"`
+	Title    string   `xml:"title,attr"`
+	Sections []struct {
+		XMLName xml.Name `xml:"section"`
+		Name    string   `xml:"name,attr"`
+		Items   []struct {
+			XMLName     xml.Name `xml:"item"`
+			Name        string   `xml:"name"`
+			UPC         string   `xml:"upc,attr"`
+			Stock       int      `xml:"stock,attr"`
+			Price       float64  `xml:"price"`
+			Description string   `xml:"description"`
+		} `xml:"item"`
+	} `xml:"section"`
+}
+
+// To simplify main's error handling
+func printXML(s string, v interface{}) {
+	fmt.Println(s)
+	b, err := xml.MarshalIndent(v, "", "\t")
+	if err != nil {
+		log.Fatal(err)
+	}
+	fmt.Println(string(b))
+	fmt.Println()
+}
+
+func main() {
+	fmt.Println("Reading XML from standard input...")
+
+	var inv Inventory
+	dec := xml.NewDecoder(os.Stdin)
+	if err := dec.Decode(&inv); err != nil {
+		log.Fatal(err)
+	}
+
+	// At this point, inv is Go struct with all the fields filled
+	// in from the XML data. Well-formed XML input that doesn't
+	// match the specification of the fields in the Go struct are
+	// discarded without error.
+
+	// We can reformat the parts we parsed:
+	//printXML("Got:", inv)
+
+	// 1. Retrieve first item:
+	item := inv.Sections[0].Items[0]
+	fmt.Println("item variable:", item)
+	printXML("As XML:", item)
+
+	// 2. Action on each price:
+	fmt.Println("Prices:")
+	var totalValue float64
+	for _, s := range inv.Sections {
+		for _, i := range s.Items {
+			fmt.Println(i.Price)
+			totalValue += i.Price * float64(i.Stock)
+		}
+	}
+	fmt.Println("Total inventory value:", totalValue)
+	fmt.Println()
+
+	// 3. Slice of all the names:
+	var names []string
+	for _, s := range inv.Sections {
+		for _, i := range s.Items {
+			names = append(names, i.Name)
+		}
+	}
+	fmt.Printf("names: %q\n", names)
+}