Function Example

doc_test.go:168–236

XPath package example. See more xpath implements package: https://github.com/antchfx/htmlquery https://github.com/antchfx/xmlquery https://github.com/antchfx/jsonquery

()

// https://github.com/antchfx/xmlquery
// https://github.com/antchfx/jsonquery
func Example() {
	/***
	?xml version="1.0" encoding="UTF-8"?>
	<bookstore>
		<book>
			<title>Everyday Italian</title>
			<author>Giada De Laurentiis</author>
			<year>2005</year>
			<price>30.00</price>
		</book>
		<book>
			<title>Harry Potter</title>
			<author>J K. Rowling</author>
			<year>2005</year>
			<price>29.99</price>
		</book>
	</bookstore>
	**/

	// Here, for begin test, we should create a document
	books := []struct {
		title  string
		author string
		year   int
		price  float64
	}{
		{title: "Everyday Italian", author: "Giada De Laurentiis", year: 2005, price: 30.00},
		{title: "Harry Potter", author: "J K. Rowling", year: 2005, price: 29.99},
	}
	bookstore := &Node{Data: "bookstore", Type: ElementNode}
	for _, v := range books {
		book := &Node{Data: "book", Type: ElementNode}
		title := &Node{Data: "title", Type: ElementNode}
		title.AddChild(&Node{Data: v.title, Type: TextNode})
		book.AddChild(title)
		author := &Node{Data: "author", Type: ElementNode}
		author.AddChild(&Node{Data: v.author, Type: TextNode})
		book.AddChild(author)
		year := &Node{Data: "year", Type: ElementNode}
		year.AddChild(&Node{Data: fmt.Sprintf("%d", v.year), Type: TextNode})
		book.AddChild(year)
		price := &Node{Data: "price", Type: ElementNode}
		price.AddChild(&Node{Data: fmt.Sprintf("%f", v.price), Type: TextNode})
		book.AddChild(price)
		bookstore.AddChild(book)
	}
	var doc = &Node{}
	doc.AddChild(bookstore)
	var root xpath.NodeNavigator = &NodeNavigator{curr: doc, root: doc}
	expr, err := xpath.Compile("count(//book)")
	// using Evaluate() method
	if err != nil {
		panic(err)
	}
	val := expr.Evaluate(root) // it returns float64 type
	fmt.Println(val.(float64))

	// using Evaluate() method