// This example demonstrates a custom function to process template text.
// It installs the strings.Title function and uses it to
// Make Title Text Look Good In Our Template's Output.
func ExampleTemplate_func() {
// First we create a FuncMap with which to register the function.
funcMap := template.FuncMap{
// The name "title" is what the function will be called in the template text.
"title": strings.Title,
}
// A simple template definition to test our function.
// We print the input text several ways:
// - the original
// - title-cased
// - title-cased and then printed with %q
// - printed with %q and then title-cased.
const templateText = `
Input: {{printf "%q" .}}
Output 0: {{title .}}
Output 1: {{title . | printf "%q"}}
Output 2: {{printf "%q" . | title}}
`
// Create a template, add the function map, and parse the text.
tmpl, err := template.New("titleTest").Funcs(funcMap).Parse(templateText)
if err != nil {
log.Fatalf("parsing: %s", err)
}
// Run the template to verify the output.
err = tmpl.Execute(os.Stdout, "the go programming language")
if err != nil {
log.Fatalf("execution: %s", err)
}
// Output:
// Input: "the go programming language"
// Output 0: The Go Programming Language
// Output 1: "The Go Programming Language"
// Output 2: "The Go Programming Language"
}
func TestEnsurePipelineContains(t *testing.T) {
tests := []struct {
input, output string
ids []string
}{
{
"{{.X}}",
".X",
[]string{},
},
{
"{{.X | html}}",
".X | html",
[]string{},
},
{
"{{.X}}",
".X | html",
[]string{"html"},
},
{
"{{.X | html}}",
".X | html | urlquery",
[]string{"urlquery"},
},
{
"{{.X | html | urlquery}}",
".X | html | urlquery",
[]string{"urlquery"},
},
{
"{{.X | html | urlquery}}",
".X | html | urlquery",
[]string{"html", "urlquery"},
},
{
"{{.X | html | urlquery}}",
".X | html | urlquery",
[]string{"html"},
},
{
"{{.X | urlquery}}",
".X | html | urlquery",
[]string{"html", "urlquery"},
},
{
"{{.X | html | print}}",
".X | urlquery | html | print",
[]string{"urlquery", "html"},
},
{
"{{($).X | html | print}}",
"($).X | urlquery | html | print",
[]string{"urlquery", "html"},
},
{
"{{.X | print 2 | .f 3}}",
".X | print 2 | .f 3 | urlquery | html",
[]string{"urlquery", "html"},
},
{
"{{.X | html | print 2 | .f 3}}",
".X | urlquery | html | print 2 | .f 3",
[]string{"urlquery", "html"},
},
{
// covering issue 10801
"{{.X | js.x }}",
".X | js.x | urlquery | html",
[]string{"urlquery", "html"},
},
{
// covering issue 10801
"{{.X | (print 12 | js).x }}",
".X | (print 12 | js).x | urlquery | html",
[]string{"urlquery", "html"},
},
}
for i, test := range tests {
tmpl := template.Must(template.New("test").Parse(test.input))
action, ok := (tmpl.Tree.Root.Nodes[0].(*parse.ActionNode))
if !ok {
t.Errorf("#%d: First node is not an action: %s", i, test.input)
continue
}
pipe := action.Pipe
ensurePipelineContains(pipe, test.ids)
got := pipe.String()
if got != test.output {
t.Errorf("#%d: %s, %v: want\n\t%s\ngot\n\t%s", i, test.input, test.ids, test.output, got)
}
}
}