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template: format error with pointer receiver.

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This is a continuation of 982d70c6d5d6.

R=golang-dev, rsc
CC=golang-dev
https://golang.org/cl/5348042
This commit is contained in:
David Symonds 2011-11-04 23:45:38 +11:00
parent 7f5ae484eb
commit 39fcca60cb
2 changed files with 22 additions and 1 deletions
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2
src/pkg/text/template/exec.go
View File

@ -660,7 +660,7 @@ func (s *state) printValue(n parse.Node, v reflect.Value) {
}
if !v.Type().Implements(errorType) && !v.Type().Implements(fmtStringerType) {
if v.CanAddr() && reflect.PtrTo(v.Type()).Implements(fmtStringerType) {
if v.CanAddr() && (reflect.PtrTo(v.Type()).Implements(errorType) || reflect.PtrTo(v.Type()).Implements(fmtStringerType)) {
v = v.Addr()
} else {
switch v.Kind() {

21
src/pkg/text/template/exec_test.go
View File

@ -32,6 +32,9 @@ type T struct {
// Struct with String method.
V0 V
V1, V2 *V
// Struct with Error method.
W0 W
W1, W2 *W
// Slices
SI []int
SIEmpty []int
@ -77,6 +80,17 @@ func (v *V) String() string {
return fmt.Sprintf("<%d>", v.j)
}
type W struct {
k int
}
func (w *W) Error() string {
if w == nil {
return "nilW"
}
return fmt.Sprintf("[%d]", w.k)
}
var tVal = &T{
True: true,
I: 17,
@ -85,6 +99,8 @@ var tVal = &T{
U: &U{"v"},
V0: V{6666},
V1: &V{7777}, // leave V2 as nil
W0: W{888},
W1: &W{999}, // leave W2 as nil
SI: []int{3, 4, 5},
SB: []bool{true, false},
MSI: map[string]int{"one": 1, "two": 2, "three": 3},
@ -251,6 +267,11 @@ var execTests = []execTest{
{"&V{7777}.String()", "-{{.V1}}-", "-<7777>-", tVal, true},
{"(*V)(nil).String()", "-{{.V2}}-", "-nilV-", tVal, true},
// Type with Error method.
{"W{888}.Error()", "-{{.W0}}-", "-[888]-", tVal, true},
{"&W{999}.Error()", "-{{.W1}}-", "-[999]-", tVal, true},
{"(*W)(nil).Error()", "-{{.W2}}-", "-nilW-", tVal, true},
// Pointers.
{"*int", "{{.PI}}", "23", tVal, true},
{"*[]int", "{{.PSI}}", "[21 22 23]", tVal, true},