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text/template: evaluate function fields
Just an oversight they didn't work and easy to address. Fixes #3025. R=golang-dev, dsymonds CC=golang-dev https://golang.org/cl/5656059
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@ -419,10 +419,14 @@ func (s *state) evalField(dot reflect.Value, fieldName string, args []parse.Node
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tField, ok := receiver.Type().FieldByName(fieldName)
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if ok {
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field := receiver.FieldByIndex(tField.Index)
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if hasArgs {
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s.errorf("%s is not a method but has arguments", fieldName)
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}
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if tField.PkgPath == "" { // field is exported
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// If it's a function, we must call it.
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if field.Type().Kind() == reflect.Func {
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return s.evalCall(dot, field, fieldName, args, final)
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}
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if hasArgs {
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s.errorf("%s is not a method or function but has arguments", fieldName)
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}
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return field
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}
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}
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@ -59,6 +59,8 @@ type T struct {
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PI *int
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PSI *[]int
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NIL *int
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// Function (not method)
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Func func(...string) string
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// Template to test evaluation of templates.
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Tmpl *Template
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}
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@ -118,6 +120,7 @@ var tVal = &T{
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Err: errors.New("erroozle"),
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PI: newInt(23),
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PSI: newIntSlice(21, 22, 23),
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Func: func(s ...string) string { return fmt.Sprint("<", strings.Join(s, "+"), ">") },
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Tmpl: Must(New("x").Parse("test template")), // "x" is the value of .X
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}
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@ -297,8 +300,13 @@ var execTests = []execTest{
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"{{with $x := .}}{{with .SI}}{{$.GetU.TrueFalse $.True}}{{end}}{{end}}",
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"true", tVal, true},
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// Function call
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{".Func", "-{{.Func}}-", "-<>-", tVal, true},
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{".Func2", "-{{.Func `he` `llo`}}-", "-<he+llo>-", tVal, true},
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// Pipelines.
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{"pipeline", "-{{.Method0 | .Method2 .U16}}-", "-Method2: 16 M0-", tVal, true},
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{"pipeline func", "-{{.Func `llo` | .Func `he` }}-", "-<he+<llo>>-", tVal, true},
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// If.
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{"if true", "{{if true}}TRUE{{end}}", "TRUE", tVal, true},
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