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fix(decoder): accept anchored null pointer fields #990

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fix(decoder): accept anchored null pointer fields #990

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6 changes: 5 additions & 1 deletion decode.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1098,8 +1098,12 @@ func (d *Decoder) createDecodedNewValue(
node = anchor
}
}
valueNode := node
if anchor, ok := node.(*ast.AnchorNode); ok {
valueNode = anchor.Value
}
var newValue reflect.Value
if node.Type() == ast.NullType {
if valueNode.Type() == ast.NullType {
newValue = reflect.New(typ).Elem()
} else {
newValue = d.createDecodableValue(typ)
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22 changes: 22 additions & 0 deletions decode_test.go
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Expand Up @@ -4169,3 +4169,25 @@ func TestIssue735(t *testing.T) {
}
})
}

func TestDecoder_AnchoredNullPointer(t *testing.T) {
type Opts struct {
Name string `yaml:"name"`
}
for _, value := range []string{"null", "~"} {
for _, initial := range []*Opts{nil, {Name: "default"}} {
t.Run(fmt.Sprintf("%s/initialized=%t", value, initial != nil), func(t *testing.T) {
got := struct {
Opts *Opts `yaml:"opts,anchor"`
Copy *Opts `yaml:"copy"`
}{Opts: initial, Copy: initial}
if err := yaml.Unmarshal([]byte("opts: &opts "+value+"\ncopy: *opts\n"), &got); err != nil {
t.Fatal(err)
}
if got.Opts != nil || got.Copy != nil {
t.Fatalf("expected nil pointers, got %+v", got)
}
})
}
}
}
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