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113 lines
2.5 KiB
Go
113 lines
2.5 KiB
Go
// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build go1.13
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// +build go1.13
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package template_test
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import (
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"log"
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"os"
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"strings"
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"text/template"
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)
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func ExampleTemplate() {
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// Define a template.
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const letter = `
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Dear {{.Name}},
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{{if .Attended}}
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It was a pleasure to see you at the wedding.
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{{- else}}
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It is a shame you couldn't make it to the wedding.
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{{- end}}
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{{with .Gift -}}
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Thank you for the lovely {{.}}.
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{{end}}
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Best wishes,
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Josie
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`
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// Prepare some data to insert into the template.
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type Recipient struct {
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Name, Gift string
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Attended bool
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}
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var recipients = []Recipient{
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{"Aunt Mildred", "bone china tea set", true},
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{"Uncle John", "moleskin pants", false},
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{"Cousin Rodney", "", false},
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}
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// Create a new template and parse the letter into it.
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t := template.Must(template.New("letter").Parse(letter))
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// Execute the template for each recipient.
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for _, r := range recipients {
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err := t.Execute(os.Stdout, r)
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if err != nil {
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log.Println("executing template:", err)
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}
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}
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// Output:
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// Dear Aunt Mildred,
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//
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// It was a pleasure to see you at the wedding.
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// Thank you for the lovely bone china tea set.
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//
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// Best wishes,
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// Josie
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//
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// Dear Uncle John,
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//
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// It is a shame you couldn't make it to the wedding.
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// Thank you for the lovely moleskin pants.
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//
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// Best wishes,
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// Josie
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//
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// Dear Cousin Rodney,
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//
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// It is a shame you couldn't make it to the wedding.
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//
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// Best wishes,
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// Josie
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}
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// The following example is duplicated in html/template; keep them in sync.
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func ExampleTemplate_block() {
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const (
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master = `Names:{{block "list" .}}{{"\n"}}{{range .}}{{println "-" .}}{{end}}{{end}}`
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overlay = `{{define "list"}} {{join . ", "}}{{end}} `
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)
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var (
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funcs = template.FuncMap{"join": strings.Join}
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guardians = []string{"Gamora", "Groot", "Nebula", "Rocket", "Star-Lord"}
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)
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masterTmpl, err := template.New("master").Funcs(funcs).Parse(master)
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if err != nil {
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log.Fatal(err)
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}
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overlayTmpl, err := template.Must(masterTmpl.Clone()).Parse(overlay)
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if err != nil {
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log.Fatal(err)
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}
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if err := masterTmpl.Execute(os.Stdout, guardians); err != nil {
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log.Fatal(err)
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}
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if err := overlayTmpl.Execute(os.Stdout, guardians); err != nil {
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log.Fatal(err)
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}
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// Output:
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// Names:
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// - Gamora
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// - Groot
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// - Nebula
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// - Rocket
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// - Star-Lord
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// Names: Gamora, Groot, Nebula, Rocket, Star-Lord
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}
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