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Fixing internalization of null slice and array fields #1303

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Merged
merged 1 commit into from
May 6, 2024
Merged

Fixing internalization of null slice and array fields #1303

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6 changes: 6 additions & 0 deletions compiler/prelude/jsmapping.js
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Original file line number Diff line number Diff line change
Expand Up @@ -236,6 +236,9 @@ var $internalize = (v, t, recv, seen, makeWrapper) => {
case $kindFloat64:
return parseFloat(v);
case $kindArray:
if (v === null || v === undefined) {
$throwRuntimeError("cannot internalize "+v+" as a "+t.string);
}
if (v.length !== t.len) {
$throwRuntimeError("got array with wrong size from JavaScript native");
}
Expand Down Expand Up @@ -331,6 +334,9 @@ var $internalize = (v, t, recv, seen, makeWrapper) => {
return $internalize(v, t.elem, makeWrapper);
}
case $kindSlice:
if (v == null) {
return t.zero();
}
return new t($mapArray(v, e => { return $internalize(e, t.elem, makeWrapper); }));
case $kindString:
v = String(v);
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39 changes: 39 additions & 0 deletions tests/js_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -829,6 +829,45 @@ func TestExternalize(t *testing.T) {
}
}

func TestInternalizeSlice(t *testing.T) {
tests := []struct {
name string
init []int
want string
}{
{
name: `nil slice`,
init: []int(nil),
want: `[]int(nil)`,
},
{
name: `empty slice`,
init: []int{},
want: `[]int{}`,
},
{
name: `non-empty slice`,
init: []int{42, 53, 64},
want: `[]int{42, 53, 64}`,
},
}

for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
b := struct {
*js.Object
V []int `js:"V"` // V is externalized
}{Object: js.Global.Get("Object").New()}
b.V = tt.init

result := fmt.Sprintf(`%#v`, b.V) // internalize b.V
if result != tt.want {
t.Errorf(`Unexpected result %q != %q`, result, tt.want)
}
})
}
}

func TestInternalizeExternalizeNull(t *testing.T) {
type S struct {
*js.Object
Expand Down
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