github.com/shogo82148/std@v1.22.1-0.20240327122250-4e474527810c/text/template/example_test.go (about)

     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  	"github.com/shogo82148/std/log"
     9  	"github.com/shogo82148/std/os"
    10  	"github.com/shogo82148/std/strings"
    11  	"github.com/shogo82148/std/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  	// テンプレートに挿入するためのデータを準備します。
    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  	// 新しいテンプレートを作成し、その中にレターを解析します。
    42  	t := template.Must(template.New("letter").Parse(letter))
    43  
    44  	// 各受信者に対してテンプレートを実行します。
    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  func ExampleTemplate_block() {
    78  	const (
    79  		master  = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
    80  		overlay = `{{define "list"}} {{join . ", "}}{{end}} `
    81  	)
    82  	var (
    83  		funcs     = template.FuncMap{"join": strings.Join}
    84  		guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
    85  	)
    86  	masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
    87  	if err != nil {
    88  		log.Fatal(err)
    89  	}
    90  	overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)
    91  	if err != nil {
    92  		log.Fatal(err)
    93  	}
    94  	if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {
    95  		log.Fatal(err)
    96  	}
    97  	if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {
    98  		log.Fatal(err)
    99  	}
   100  	// Output:
   101  	// Names:
   102  	// - Gamora
   103  	// - Groot
   104  	// - Nebula
   105  	// - Rocket
   106  	// - Star-Lord
   107  	// Names: Gamora, Groot, Nebula, Rocket, Star-Lord
   108  }