example_test.go

Documentation: text/template

		 1  // Copyright 2011 The Go Authors. All rights reserved.
		 2  // Use of this source code is governed by a BSD-style
		 3  // license that can be found in the LICENSE file.
		 4  
		 5  package template_test
		 6  
		 7  import (
		 8  	"log"
		 9  	"os"
		10  	"strings"
		11  	"text/template"
		12  )
		13  
		14  func ExampleTemplate() {
		15  	// Define a template.
		16  	const letter = `
		17  Dear {{.Name}},
		18  {{if .Attended}}
		19  It was a pleasure to see you at the wedding.
		20  {{- else}}
		21  It is a shame you couldn't make it to the wedding.
		22  {{- end}}
		23  {{with .Gift -}}
		24  Thank you for the lovely {{.}}.
		25  {{end}}
		26  Best wishes,
		27  Josie
		28  `
		29  
		30  	// Prepare some data to insert into the template.
		31  	type Recipient struct {
		32  		Name, Gift string
		33  		Attended	 bool
		34  	}
		35  	var recipients = []Recipient{
		36  		{"Aunt Mildred", "bone china tea set", true},
		37  		{"Uncle John", "moleskin pants", false},
		38  		{"Cousin Rodney", "", false},
		39  	}
		40  
		41  	// Create a new template and parse the letter into it.
		42  	t := template.Must(template.New("letter").Parse(letter))
		43  
		44  	// Execute the template for each recipient.
		45  	for _, r := range recipients {
		46  		err := t.Execute(os.Stdout, r)
		47  		if err != nil {
		48  			log.Println("executing template:", err)
		49  		}
		50  	}
		51  
		52  	// Output:
		53  	// Dear Aunt Mildred,
		54  	//
		55  	// It was a pleasure to see you at the wedding.
		56  	// Thank you for the lovely bone china tea set.
		57  	//
		58  	// Best wishes,
		59  	// Josie
		60  	//
		61  	// Dear Uncle John,
		62  	//
		63  	// It is a shame you couldn't make it to the wedding.
		64  	// Thank you for the lovely moleskin pants.
		65  	//
		66  	// Best wishes,
		67  	// Josie
		68  	//
		69  	// Dear Cousin Rodney,
		70  	//
		71  	// It is a shame you couldn't make it to the wedding.
		72  	//
		73  	// Best wishes,
		74  	// Josie
		75  }
		76  
		77  // The following example is duplicated in html/template; keep them in sync.
		78  
		79  func ExampleTemplate_block() {
		80  	const (
		81  		master	= `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
		82  		overlay = `{{define "list"}} {{join . ", "}}{{end}} `
		83  	)
		84  	var (
		85  		funcs		 = template.FuncMap{"join": strings.Join}
		86  		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
		87  	)
		88  	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
		89  	if err != nil {
		90  		log.Fatal(err)
		91  	}
		92  	overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)
		93  	if err != nil {
		94  		log.Fatal(err)
		95  	}
		96  	if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {
		97  		log.Fatal(err)
		98  	}
		99  	if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {
	 100  		log.Fatal(err)
	 101  	}
	 102  	// Output:
	 103  	// Names:
	 104  	// - Gamora
	 105  	// - Groot
	 106  	// - Nebula
	 107  	// - Rocket
	 108  	// - Star-Lord
	 109  	// Names: Gamora, Groot, Nebula, Rocket, Star-Lord
	 110  }
	 111
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