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Decode S=[] into a non-nil []interface{}. #339

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merged 1 commit into from Jan 12, 2022
Merged

Decode S=[] into a non-nil []interface{}. #339

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11 changes: 11 additions & 0 deletions decode_test.go
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Expand Up @@ -618,6 +618,17 @@ func TestDecodeSlices(t *testing.T) {
}
}

func TestDecodeInterfaceSlice(t *testing.T) {
var v map[string]interface{}
if _, err := Decode(`S = []`, &v); err != nil {
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Could you also test nested arrays and inline tables?

arr = []
nested = [[]]
tbl = {arr = []}

Just to make sure this keeps working in all future updates!

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Actually, looking at this a bit closer the tests should be integrated with TestDecodeSlices, I'll just merge this as-is and fix it up; thanks!

t.Errorf(err.Error())
}
// S = [] should decode into a non-nil []interface{} (see issue #338).
if reflect.ValueOf(v["S"]).IsNil() {
t.Errorf("S is nil")
}
}

func TestDecodePrimitive(t *testing.T) {
type S struct {
P Primitive
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4 changes: 4 additions & 0 deletions parse.go
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Expand Up @@ -350,6 +350,10 @@ func (p *parser) valueArray(it item) (interface{}, tomlType) {
array []interface{}
types []tomlType
)
// Initialize to a non-nil empty slice. This makes it
// consistent with how S = [] decodes into a non-nil slice
// inside something like struct { S []string }.
array = []interface{}{}
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Could you mention your issue in this comment? Just for future reference.

Also, might as well move this up with the declaration: array = []interface{}{} rather than defining it and then assigning a value.

for it = p.next(); it.typ != itemArrayEnd; it = p.next() {
if it.typ == itemCommentStart {
p.expect(itemText)
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