// Copyright 2015 The Go Authors. All rights reserved.// Use of this source code is governed by a BSD-style// license that can be found in the LICENSE file. package template_test import (	"fmt"	"html/template"	"log"	"os"	"strings") func Example() {	const tpl = `<!DOCTYPE html><html>	<head>		<meta charset="UTF-8">		<title>{{.Title}}</title>	</head>	<body>		{{range .Items}}<div>{{ . }}</div>{{else}}<div><strong>no rows</strong></div>{{end}}	</body></html>` 	check := func(err error) {		if err != nil {			log.Fatal(err)		}	}	t, err := template.New("webpage").Parse(tpl)	check(err) 	data := struct {		Title string		Items []string	}{		Title: "My page",		Items: []string{			"My photos",			"My blog",		},	} 	err = t.Execute(os.Stdout, data)	check(err) 	noItems := struct {		Title string		Items []string	}{		Title: "My another page",		Items: []string{},	} 	err = t.Execute(os.Stdout, noItems)	check(err) 	// Output:	// <!DOCTYPE html>	// <html>	// 	<head>	// 		<meta charset="UTF-8">	// 		<title>My page</title>	// 	</head>	// 	<body>	// 		<div>My photos</div><div>My blog</div>	// 	</body>	// </html>	// <!DOCTYPE html>	// <html>	// 	<head>	// 		<meta charset="UTF-8">	// 		<title>My another page</title>	// 	</head>	// 	<body>	// 		<div><strong>no rows</strong></div>	// 	</body>	// </html> } func Example_autoescaping() {	check := func(err error) {		if err != nil {			log.Fatal(err)		}	}	t, err := template.New("foo").Parse(`{{define "T"}}Hello, {{.}}!{{end}}`)	check(err)	err = t.ExecuteTemplate(os.Stdout, "T", "<script>alert('you have been pwned')</script>")	check(err)	// Output:	// Hello, &lt;script&gt;alert(&#39;you have been pwned&#39;)&lt;/script&gt;!} func Example_escape() {	const s = `"Fran & Freddie's Diner" <tasty@example.com>`	v := []interface{}{`"Fran & Freddie's Diner"`, ' ', `<tasty@example.com>`} 	fmt.Println(template.HTMLEscapeString(s))	template.HTMLEscape(os.Stdout, []byte(s))	fmt.Fprintln(os.Stdout, "")	fmt.Println(template.HTMLEscaper(v...)) 	fmt.Println(template.JSEscapeString(s))	template.JSEscape(os.Stdout, []byte(s))	fmt.Fprintln(os.Stdout, "")	fmt.Println(template.JSEscaper(v...)) 	fmt.Println(template.URLQueryEscaper(v...)) 	// Output:	// &#34;Fran &amp; Freddie&#39;s Diner&#34; &lt;tasty@example.com&gt;	// &#34;Fran &amp; Freddie&#39;s Diner&#34; &lt;tasty@example.com&gt;	// &#34;Fran &amp; Freddie&#39;s Diner&#34;32&lt;tasty@example.com&gt;	// \"Fran & Freddie\'s Diner\" \x3Ctasty@example.com\x3E	// \"Fran & Freddie\'s Diner\" \x3Ctasty@example.com\x3E	// \"Fran & Freddie\'s Diner\"32\x3Ctasty@example.com\x3E	// %22Fran+%26+Freddie%27s+Diner%2232%3Ctasty%40example.com%3E } // The following example is duplicated in text/template; keep them in sync. func ExampleTemplate_block() {	const (		master  = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`		overlay = `{{define "list"}} {{join . ", "}}{{end}} `	)	var (		funcs     = template.FuncMap{"join": strings.Join}		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}	)	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)	if err != nil {		log.Fatal(err)	}	overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)	if err != nil {		log.Fatal(err)	}	if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {		log.Fatal(err)	}	if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {		log.Fatal(err)	}	// Output:	// Names:	// - Gamora	// - Groot	// - Nebula	// - Rocket	// - Star-Lord	// Names: Gamora, Groot, Nebula, Rocket, Star-Lord}