Go by Example: Text Template
|
text/template is a useful text generating tool. Related examples: http://golang.org/pkg/text/template/#pkg-examples |
package main
|
import (
"os"
"text/template"
)
|
|
var card1 = map[int]string{1: "S", 2: "H", 3: "C", 4: "D"}
var card2 = map[string]string{"a": "S", "b": "H",
"c": "C", "d": "D"}
|
|
|
The simplest template is the “dot”, just printout the variable |
func check(err error) {
if err != nil {
panic(err)
}
}
func main() {
|
t := template.Must(template.New("t1").
Parse("Dot:{{.}}\n"))
check(t.Execute(os.Stdout, card1))
|
|
|
The following line will fail because key should be alphanumeric. |
//`t := template.Must(template.New("greet").Parse("Hi,{{.1}}\n"))`
//`err := t.Execute(os.Stdout, card1)`
|
t = template.Must(template.New("t2").
Parse("Hi,{{.a}}\n"))
check(t.Execute(os.Stdout, card2))
|
|
|
Use variable to ierate map. |
t = template.Must(template.New("t3").Parse(`For
{{range $k,$v := .}} k={{printf "%03d" $k}} v={{$v}}
{{end}}
`))
check(t.Execute(os.Stdout, card1))
|
|
t = template.Must(template.New("t2").
Parse("{{index . 3}}\n"))
check(t.Execute(os.Stdout, card1))
|
|
Use {{define}} to prevent write multiple times. |
t = template.Must(template.New("t2").Parse(`Repeat
{{define "T1"}}Apple{{end}} {{define "T2"}}Ape{{end}}
{{template "T2"}} ate {{template "T1"}}
`))
check(t.Execute(os.Stdout, card1))
}
|
$ go run text-template.go
Dot:map[1:S 2:H 3:C 4:D]
Hi,S
For
k=001 v=S
k=002 v=H
k=003 v=C
k=004 v=D
|
|
C
Repeat
|
|
Ape ate Apple
|
Previous example: HTTP Client.
Next example: Memory and Sizeof.